Fixed MTP to work with TWRP

drivers/isdn/gigaset/Kconfig

@@ -0,0 +1,70 @@
+menuconfig ISDN_DRV_GIGASET
+	tristate "Siemens Gigaset support"
+	depends on TTY
+	select CRC_CCITT
+	select BITREVERSE
+	help
+	  This driver supports the Siemens Gigaset SX205/255 family of
+	  ISDN DECT bases, including the predecessors Gigaset 3070/3075
+	  and 4170/4175 and their T-Com versions Sinus 45isdn and Sinus
+	  721X.
+	  If you have one of these devices, say M here and for at least
+	  one of the connection specific parts that follow.
+	  This will build a module called "gigaset".
+	  Note: If you build your ISDN subsystem (ISDN_CAPI or ISDN_I4L)
+	  as a module, you have to build this driver as a module too,
+	  otherwise the Gigaset device won't show up as an ISDN device.
+
+if ISDN_DRV_GIGASET
+
+config GIGASET_CAPI
+	bool "Gigaset CAPI support"
+	depends on ISDN_CAPI='y'||(ISDN_CAPI='m'&&ISDN_DRV_GIGASET='m')
+	default ISDN_I4L='n'
+	help
+	  Build the Gigaset driver as a CAPI 2.0 driver interfacing with
+	  the Kernel CAPI subsystem. To use it with the old ISDN4Linux
+	  subsystem you'll have to enable the capidrv glue driver.
+	  (select ISDN_CAPI_CAPIDRV.)
+	  Say N to build the old native ISDN4Linux variant.
+	  If unsure, say Y.
+
+config GIGASET_I4L
+	bool
+	depends on ISDN_I4L='y'||(ISDN_I4L='m'&&ISDN_DRV_GIGASET='m')
+	default !GIGASET_CAPI
+
+config GIGASET_DUMMYLL
+	bool
+	default !GIGASET_CAPI&&!GIGASET_I4L
+
+config GIGASET_BASE
+	tristate "Gigaset base station support"
+	depends on USB
+	help
+	  Say M here if you want to use the USB interface of the Gigaset
+	  base for connection to your system.
+	  This will build a module called "bas_gigaset".
+
+config GIGASET_M105
+	tristate "Gigaset M105 support"
+	depends on USB
+	help
+	  Say M here if you want to connect to the Gigaset base via DECT
+	  using a Gigaset M105 (Sinus 45 Data 2) USB DECT device.
+	  This will build a module called "usb_gigaset".
+
+config GIGASET_M101
+	tristate "Gigaset M101 support"
+	help
+	  Say M here if you want to connect to the Gigaset base via DECT
+	  using a Gigaset M101 (Sinus 45 Data 1) RS232 DECT device.
+	  This will build a module called "ser_gigaset".
+
+config GIGASET_DEBUG
+	bool "Gigaset debugging"
+	help
+	  This enables debugging code in the Gigaset drivers.
+	  If in doubt, say yes.
+
+endif # ISDN_DRV_GIGASET

drivers/isdn/gigaset/Makefile

@@ -0,0 +1,12 @@
+gigaset-y := common.o interface.o proc.o ev-layer.o asyncdata.o
+gigaset-$(CONFIG_GIGASET_CAPI) += capi.o
+gigaset-$(CONFIG_GIGASET_I4L) += i4l.o
+gigaset-$(CONFIG_GIGASET_DUMMYLL) += dummyll.o
+usb_gigaset-y := usb-gigaset.o
+ser_gigaset-y := ser-gigaset.o
+bas_gigaset-y := bas-gigaset.o isocdata.o
+
+obj-$(CONFIG_ISDN_DRV_GIGASET) += gigaset.o
+obj-$(CONFIG_GIGASET_M105) += usb_gigaset.o
+obj-$(CONFIG_GIGASET_BASE) += bas_gigaset.o
+obj-$(CONFIG_GIGASET_M101) += ser_gigaset.o

drivers/isdn/gigaset/asyncdata.c

@@ -0,0 +1,609 @@
+/*
+ * Common data handling layer for ser_gigaset and usb_gigaset
+ *
+ * Copyright (c) 2005 by Tilman Schmidt <tilman@imap.cc>,
+ *                       Hansjoerg Lipp <hjlipp@web.de>,
+ *                       Stefan Eilers.
+ *
+ * =====================================================================
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License as
+ *	published by the Free Software Foundation; either version 2 of
+ *	the License, or (at your option) any later version.
+ * =====================================================================
+ */
+
+#include "gigaset.h"
+#include <linux/crc-ccitt.h>
+#include <linux/bitrev.h>
+#include <linux/export.h>
+
+/* check if byte must be stuffed/escaped
+ * I'm not sure which data should be encoded.
+ * Therefore I will go the hard way and encode every value
+ * less than 0x20, the flag sequence and the control escape char.
+ */
+static inline int muststuff(unsigned char c)
+{
+	if (c < PPP_TRANS) return 1;
+	if (c == PPP_FLAG) return 1;
+	if (c == PPP_ESCAPE) return 1;
+	/* other possible candidates: */
+	/* 0x91: XON with parity set */
+	/* 0x93: XOFF with parity set */
+	return 0;
+}
+
+/* == data input =========================================================== */
+
+/* process a block of received bytes in command mode
+ * (mstate != MS_LOCKED && (inputstate & INS_command))
+ * Append received bytes to the command response buffer and forward them
+ * line by line to the response handler. Exit whenever a mode/state change
+ * might have occurred.
+ * Note: Received lines may be terminated by CR, LF, or CR LF, which will be
+ * removed before passing the line to the response handler.
+ * Return value:
+ *	number of processed bytes
+ */
+static unsigned cmd_loop(unsigned numbytes, struct inbuf_t *inbuf)
+{
+	unsigned char *src = inbuf->data + inbuf->head;
+	struct cardstate *cs = inbuf->cs;
+	unsigned cbytes = cs->cbytes;
+	unsigned procbytes = 0;
+	unsigned char c;
+
+	while (procbytes < numbytes) {
+		c = *src++;
+		procbytes++;
+
+		switch (c) {
+		case '\n':
+			if (cbytes == 0 && cs->respdata[0] == '\r') {
+				/* collapse LF with preceding CR */
+				cs->respdata[0] = 0;
+				break;
+			}
+			/* --v-- fall through --v-- */
+		case '\r':
+			/* end of message line, pass to response handler */
+			if (cbytes >= MAX_RESP_SIZE) {
+				dev_warn(cs->dev, "response too large (%d)\n",
+					 cbytes);
+				cbytes = MAX_RESP_SIZE;
+			}
+			cs->cbytes = cbytes;
+			gigaset_dbg_buffer(DEBUG_TRANSCMD, "received response",
+					   cbytes, cs->respdata);
+			gigaset_handle_modem_response(cs);
+			cbytes = 0;
+
+			/* store EOL byte for CRLF collapsing */
+			cs->respdata[0] = c;
+
+			/* cs->dle may have changed */
+			if (cs->dle && !(inbuf->inputstate & INS_DLE_command))
+				inbuf->inputstate &= ~INS_command;
+
+			/* return for reevaluating state */
+			goto exit;
+
+		case DLE_FLAG:
+			if (inbuf->inputstate & INS_DLE_char) {
+				/* quoted DLE: clear quote flag */
+				inbuf->inputstate &= ~INS_DLE_char;
+			} else if (cs->dle ||
+				   (inbuf->inputstate & INS_DLE_command)) {
+				/* DLE escape, pass up for handling */
+				inbuf->inputstate |= INS_DLE_char;
+				goto exit;
+			}
+			/* quoted or not in DLE mode: treat as regular data */
+			/* --v-- fall through --v-- */
+		default:
+			/* append to line buffer if possible */
+			if (cbytes < MAX_RESP_SIZE)
+				cs->respdata[cbytes] = c;
+			cbytes++;
+		}
+	}
+exit:
+	cs->cbytes = cbytes;
+	return procbytes;
+}
+
+/* process a block of received bytes in lock mode
+ * All received bytes are passed unmodified to the tty i/f.
+ * Return value:
+ *	number of processed bytes
+ */
+static unsigned lock_loop(unsigned numbytes, struct inbuf_t *inbuf)
+{
+	unsigned char *src = inbuf->data + inbuf->head;
+
+	gigaset_dbg_buffer(DEBUG_LOCKCMD, "received response", numbytes, src);
+	gigaset_if_receive(inbuf->cs, src, numbytes);
+	return numbytes;
+}
+
+/* process a block of received bytes in HDLC data mode
+ * (mstate != MS_LOCKED && !(inputstate & INS_command) && proto2 == L2_HDLC)
+ * Collect HDLC frames, undoing byte stuffing and watching for DLE escapes.
+ * When a frame is complete, check the FCS and pass valid frames to the LL.
+ * If DLE is encountered, return immediately to let the caller handle it.
+ * Return value:
+ *	number of processed bytes
+ */
+static unsigned hdlc_loop(unsigned numbytes, struct inbuf_t *inbuf)
+{
+	struct cardstate *cs = inbuf->cs;
+	struct bc_state *bcs = cs->bcs;
+	int inputstate = bcs->inputstate;
+	__u16 fcs = bcs->rx_fcs;
+	struct sk_buff *skb = bcs->rx_skb;
+	unsigned char *src = inbuf->data + inbuf->head;
+	unsigned procbytes = 0;
+	unsigned char c;
+
+	if (inputstate & INS_byte_stuff) {
+		if (!numbytes)
+			return 0;
+		inputstate &= ~INS_byte_stuff;
+		goto byte_stuff;
+	}
+
+	while (procbytes < numbytes) {
+		c = *src++;
+		procbytes++;
+		if (c == DLE_FLAG) {
+			if (inputstate & INS_DLE_char) {
+				/* quoted DLE: clear quote flag */
+				inputstate &= ~INS_DLE_char;
+			} else if (cs->dle || (inputstate & INS_DLE_command)) {
+				/* DLE escape, pass up for handling */
+				inputstate |= INS_DLE_char;
+				break;
+			}
+		}
+
+		if (c == PPP_ESCAPE) {
+			/* byte stuffing indicator: pull in next byte */
+			if (procbytes >= numbytes) {
+				/* end of buffer, save for later processing */
+				inputstate |= INS_byte_stuff;
+				break;
+			}
+byte_stuff:
+			c = *src++;
+			procbytes++;
+			if (c == DLE_FLAG) {
+				if (inputstate & INS_DLE_char) {
+					/* quoted DLE: clear quote flag */
+					inputstate &= ~INS_DLE_char;
+				} else if (cs->dle ||
+					   (inputstate & INS_DLE_command)) {
+					/* DLE escape, pass up for handling */
+					inputstate |=
+						INS_DLE_char | INS_byte_stuff;
+					break;
+				}
+			}
+			c ^= PPP_TRANS;
+#ifdef CONFIG_GIGASET_DEBUG
+			if (!muststuff(c))
+				gig_dbg(DEBUG_HDLC, "byte stuffed: 0x%02x", c);
+#endif
+		} else if (c == PPP_FLAG) {
+			/* end of frame: process content if any */
+			if (inputstate & INS_have_data) {
+				gig_dbg(DEBUG_HDLC,
+					"7e----------------------------");
+
+				/* check and pass received frame */
+				if (!skb) {
+					/* skipped frame */
+					gigaset_isdn_rcv_err(bcs);
+				} else if (skb->len < 2) {
+					/* frame too short for FCS */
+					dev_warn(cs->dev,
+						 "short frame (%d)\n",
+						 skb->len);
+					gigaset_isdn_rcv_err(bcs);
+					dev_kfree_skb_any(skb);
+				} else if (fcs != PPP_GOODFCS) {
+					/* frame check error */
+					dev_err(cs->dev,
+						"Checksum failed, %u bytes corrupted!\n",
+						skb->len);
+					gigaset_isdn_rcv_err(bcs);
+					dev_kfree_skb_any(skb);
+				} else {
+					/* good frame */
+					__skb_trim(skb, skb->len - 2);
+					gigaset_skb_rcvd(bcs, skb);
+				}
+
+				/* prepare reception of next frame */
+				inputstate &= ~INS_have_data;
+				skb = gigaset_new_rx_skb(bcs);
+			} else {
+				/* empty frame (7E 7E) */
+#ifdef CONFIG_GIGASET_DEBUG
+				++bcs->emptycount;
+#endif
+				if (!skb) {
+					/* skipped (?) */
+					gigaset_isdn_rcv_err(bcs);
+					skb = gigaset_new_rx_skb(bcs);
+				}
+			}
+
+			fcs = PPP_INITFCS;
+			continue;
+#ifdef CONFIG_GIGASET_DEBUG
+		} else if (muststuff(c)) {
+			/* Should not happen. Possible after ZDLE=1<CR><LF>. */
+			gig_dbg(DEBUG_HDLC, "not byte stuffed: 0x%02x", c);
+#endif
+		}
+
+		/* regular data byte, append to skb */
+#ifdef CONFIG_GIGASET_DEBUG
+		if (!(inputstate & INS_have_data)) {
+			gig_dbg(DEBUG_HDLC, "7e (%d x) ================",
+				bcs->emptycount);
+			bcs->emptycount = 0;
+		}
+#endif
+		inputstate |= INS_have_data;
+		if (skb) {
+			if (skb->len >= bcs->rx_bufsize) {
+				dev_warn(cs->dev, "received packet too long\n");
+				dev_kfree_skb_any(skb);
+				/* skip remainder of packet */
+				bcs->rx_skb = skb = NULL;
+			} else {
+				*__skb_put(skb, 1) = c;
+				fcs = crc_ccitt_byte(fcs, c);
+			}
+		}
+	}
+
+	bcs->inputstate = inputstate;
+	bcs->rx_fcs = fcs;
+	return procbytes;
+}
+
+/* process a block of received bytes in transparent data mode
+ * (mstate != MS_LOCKED && !(inputstate & INS_command) && proto2 != L2_HDLC)
+ * Invert bytes, undoing byte stuffing and watching for DLE escapes.
+ * If DLE is encountered, return immediately to let the caller handle it.
+ * Return value:
+ *	number of processed bytes
+ */
+static unsigned iraw_loop(unsigned numbytes, struct inbuf_t *inbuf)
+{
+	struct cardstate *cs = inbuf->cs;
+	struct bc_state *bcs = cs->bcs;
+	int inputstate = bcs->inputstate;
+	struct sk_buff *skb = bcs->rx_skb;
+	unsigned char *src = inbuf->data + inbuf->head;
+	unsigned procbytes = 0;
+	unsigned char c;
+
+	if (!skb) {
+		/* skip this block */
+		gigaset_new_rx_skb(bcs);
+		return numbytes;
+	}
+
+	while (procbytes < numbytes && skb->len < bcs->rx_bufsize) {
+		c = *src++;
+		procbytes++;
+
+		if (c == DLE_FLAG) {
+			if (inputstate & INS_DLE_char) {
+				/* quoted DLE: clear quote flag */
+				inputstate &= ~INS_DLE_char;
+			} else if (cs->dle || (inputstate & INS_DLE_command)) {
+				/* DLE escape, pass up for handling */
+				inputstate |= INS_DLE_char;
+				break;
+			}
+		}
+
+		/* regular data byte: append to current skb */
+		inputstate |= INS_have_data;
+		*__skb_put(skb, 1) = bitrev8(c);
+	}
+
+	/* pass data up */
+	if (inputstate & INS_have_data) {
+		gigaset_skb_rcvd(bcs, skb);
+		inputstate &= ~INS_have_data;
+		gigaset_new_rx_skb(bcs);
+	}
+
+	bcs->inputstate = inputstate;
+	return procbytes;
+}
+
+/* process DLE escapes
+ * Called whenever a DLE sequence might be encountered in the input stream.
+ * Either processes the entire DLE sequence or, if that isn't possible,
+ * notes the fact that an initial DLE has been received in the INS_DLE_char
+ * inputstate flag and resumes processing of the sequence on the next call.
+ */
+static void handle_dle(struct inbuf_t *inbuf)
+{
+	struct cardstate *cs = inbuf->cs;
+
+	if (cs->mstate == MS_LOCKED)
+		return;		/* no DLE processing in lock mode */
+
+	if (!(inbuf->inputstate & INS_DLE_char)) {
+		/* no DLE pending */
+		if (inbuf->data[inbuf->head] == DLE_FLAG &&
+		    (cs->dle || inbuf->inputstate & INS_DLE_command)) {
+			/* start of DLE sequence */
+			inbuf->head++;
+			if (inbuf->head == inbuf->tail ||
+			    inbuf->head == RBUFSIZE) {
+				/* end of buffer, save for later processing */
+				inbuf->inputstate |= INS_DLE_char;
+				return;
+			}
+		} else {
+			/* regular data byte */
+			return;
+		}
+	}
+
+	/* consume pending DLE */
+	inbuf->inputstate &= ~INS_DLE_char;
+
+	switch (inbuf->data[inbuf->head]) {
+	case 'X':	/* begin of event message */
+		if (inbuf->inputstate & INS_command)
+			dev_notice(cs->dev,
+				   "received <DLE>X in command mode\n");
+		inbuf->inputstate |= INS_command | INS_DLE_command;
+		inbuf->head++;	/* byte consumed */
+		break;
+	case '.':	/* end of event message */
+		if (!(inbuf->inputstate & INS_DLE_command))
+			dev_notice(cs->dev,
+				   "received <DLE>. without <DLE>X\n");
+		inbuf->inputstate &= ~INS_DLE_command;
+		/* return to data mode if in DLE mode */
+		if (cs->dle)
+			inbuf->inputstate &= ~INS_command;
+		inbuf->head++;	/* byte consumed */
+		break;
+	case DLE_FLAG:	/* DLE in data stream */
+		/* mark as quoted */
+		inbuf->inputstate |= INS_DLE_char;
+		if (!(cs->dle || inbuf->inputstate & INS_DLE_command))
+			dev_notice(cs->dev,
+				   "received <DLE><DLE> not in DLE mode\n");
+		break;	/* quoted byte left in buffer */
+	default:
+		dev_notice(cs->dev, "received <DLE><%02x>\n",
+			   inbuf->data[inbuf->head]);
+		/* quoted byte left in buffer */
+	}
+}
+
+/**
+ * gigaset_m10x_input() - process a block of data received from the device
+ * @inbuf:	received data and device descriptor structure.
+ *
+ * Called by hardware module {ser,usb}_gigaset with a block of received
+ * bytes. Separates the bytes received over the serial data channel into
+ * user data and command replies (locked/unlocked) according to the
+ * current state of the interface.
+ */
+void gigaset_m10x_input(struct inbuf_t *inbuf)
+{
+	struct cardstate *cs = inbuf->cs;
+	unsigned numbytes, procbytes;
+
+	gig_dbg(DEBUG_INTR, "buffer state: %u -> %u", inbuf->head, inbuf->tail);
+
+	while (inbuf->head != inbuf->tail) {
+		/* check for DLE escape */
+		handle_dle(inbuf);
+
+		/* process a contiguous block of bytes */
+		numbytes = (inbuf->head > inbuf->tail ?
+			    RBUFSIZE : inbuf->tail) - inbuf->head;
+		gig_dbg(DEBUG_INTR, "processing %u bytes", numbytes);
+		/*
+		 * numbytes may be 0 if handle_dle() ate the last byte.
+		 * This does no harm, *_loop() will just return 0 immediately.
+		 */
+
+		if (cs->mstate == MS_LOCKED)
+			procbytes = lock_loop(numbytes, inbuf);
+		else if (inbuf->inputstate & INS_command)
+			procbytes = cmd_loop(numbytes, inbuf);
+		else if (cs->bcs->proto2 == L2_HDLC)
+			procbytes = hdlc_loop(numbytes, inbuf);
+		else
+			procbytes = iraw_loop(numbytes, inbuf);
+		inbuf->head += procbytes;
+
+		/* check for buffer wraparound */
+		if (inbuf->head >= RBUFSIZE)
+			inbuf->head = 0;
+
+		gig_dbg(DEBUG_INTR, "head set to %u", inbuf->head);
+	}
+}
+EXPORT_SYMBOL_GPL(gigaset_m10x_input);
+
+
+/* == data output ========================================================== */
+
+/*
+ * Encode a data packet into an octet stuffed HDLC frame with FCS,
+ * opening and closing flags, preserving headroom data.
+ * parameters:
+ *	skb		skb containing original packet (freed upon return)
+ * Return value:
+ *	pointer to newly allocated skb containing the result frame
+ *	and the original link layer header, NULL on error
+ */
+static struct sk_buff *HDLC_Encode(struct sk_buff *skb)
+{
+	struct sk_buff *hdlc_skb;
+	__u16 fcs;
+	unsigned char c;
+	unsigned char *cp;
+	int len;
+	unsigned int stuf_cnt;
+
+	stuf_cnt = 0;
+	fcs = PPP_INITFCS;
+	cp = skb->data;
+	len = skb->len;
+	while (len--) {
+		if (muststuff(*cp))
+			stuf_cnt++;
+		fcs = crc_ccitt_byte(fcs, *cp++);
+	}
+	fcs ^= 0xffff;			/* complement */
+
+	/* size of new buffer: original size + number of stuffing bytes
+	 * + 2 bytes FCS + 2 stuffing bytes for FCS (if needed) + 2 flag bytes
+	 * + room for link layer header
+	 */
+	hdlc_skb = dev_alloc_skb(skb->len + stuf_cnt + 6 + skb->mac_len);
+	if (!hdlc_skb) {
+		dev_kfree_skb_any(skb);
+		return NULL;
+	}
+
+	/* Copy link layer header into new skb */
+	skb_reset_mac_header(hdlc_skb);
+	skb_reserve(hdlc_skb, skb->mac_len);
+	memcpy(skb_mac_header(hdlc_skb), skb_mac_header(skb), skb->mac_len);
+	hdlc_skb->mac_len = skb->mac_len;
+
+	/* Add flag sequence in front of everything.. */
+	*(skb_put(hdlc_skb, 1)) = PPP_FLAG;
+
+	/* Perform byte stuffing while copying data. */
+	while (skb->len--) {
+		if (muststuff(*skb->data)) {
+			*(skb_put(hdlc_skb, 1)) = PPP_ESCAPE;
+			*(skb_put(hdlc_skb, 1)) = (*skb->data++) ^ PPP_TRANS;
+		} else
+			*(skb_put(hdlc_skb, 1)) = *skb->data++;
+	}
+
+	/* Finally add FCS (byte stuffed) and flag sequence */
+	c = (fcs & 0x00ff);	/* least significant byte first */
+	if (muststuff(c)) {
+		*(skb_put(hdlc_skb, 1)) = PPP_ESCAPE;
+		c ^= PPP_TRANS;
+	}
+	*(skb_put(hdlc_skb, 1)) = c;
+
+	c = ((fcs >> 8) & 0x00ff);
+	if (muststuff(c)) {
+		*(skb_put(hdlc_skb, 1)) = PPP_ESCAPE;
+		c ^= PPP_TRANS;
+	}
+	*(skb_put(hdlc_skb, 1)) = c;
+
+	*(skb_put(hdlc_skb, 1)) = PPP_FLAG;
+
+	dev_kfree_skb_any(skb);
+	return hdlc_skb;
+}
+
+/*
+ * Encode a data packet into an octet stuffed raw bit inverted frame,
+ * preserving headroom data.
+ * parameters:
+ *	skb		skb containing original packet (freed upon return)
+ * Return value:
+ *	pointer to newly allocated skb containing the result frame
+ *	and the original link layer header, NULL on error
+ */
+static struct sk_buff *iraw_encode(struct sk_buff *skb)
+{
+	struct sk_buff *iraw_skb;
+	unsigned char c;
+	unsigned char *cp;
+	int len;
+
+	/* size of new buffer (worst case = every byte must be stuffed):
+	 * 2 * original size + room for link layer header
+	 */
+	iraw_skb = dev_alloc_skb(2 * skb->len + skb->mac_len);
+	if (!iraw_skb) {
+		dev_kfree_skb_any(skb);
+		return NULL;
+	}
+
+	/* copy link layer header into new skb */
+	skb_reset_mac_header(iraw_skb);
+	skb_reserve(iraw_skb, skb->mac_len);
+	memcpy(skb_mac_header(iraw_skb), skb_mac_header(skb), skb->mac_len);
+	iraw_skb->mac_len = skb->mac_len;
+
+	/* copy and stuff data */
+	cp = skb->data;
+	len = skb->len;
+	while (len--) {
+		c = bitrev8(*cp++);
+		if (c == DLE_FLAG)
+			*(skb_put(iraw_skb, 1)) = c;
+		*(skb_put(iraw_skb, 1)) = c;
+	}
+	dev_kfree_skb_any(skb);
+	return iraw_skb;
+}
+
+/**
+ * gigaset_m10x_send_skb() - queue an skb for sending
+ * @bcs:	B channel descriptor structure.
+ * @skb:	data to send.
+ *
+ * Called by LL to encode and queue an skb for sending, and start
+ * transmission if necessary.
+ * Once the payload data has been transmitted completely, gigaset_skb_sent()
+ * will be called with the skb's link layer header preserved.
+ *
+ * Return value:
+ *	number of bytes accepted for sending (skb->len) if ok,
+ *	error code < 0 (eg. -ENOMEM) on error
+ */
+int gigaset_m10x_send_skb(struct bc_state *bcs, struct sk_buff *skb)
+{
+	struct cardstate *cs = bcs->cs;
+	unsigned len = skb->len;
+	unsigned long flags;
+
+	if (bcs->proto2 == L2_HDLC)
+		skb = HDLC_Encode(skb);
+	else
+		skb = iraw_encode(skb);
+	if (!skb) {
+		dev_err(cs->dev,
+			"unable to allocate memory for encoding!\n");
+		return -ENOMEM;
+	}
+
+	skb_queue_tail(&bcs->squeue, skb);
+	spin_lock_irqsave(&cs->lock, flags);
+	if (cs->connected)
+		tasklet_schedule(&cs->write_tasklet);
+	spin_unlock_irqrestore(&cs->lock, flags);
+
+	return len;	/* ok so far */
+}
+EXPORT_SYMBOL_GPL(gigaset_m10x_send_skb);

drivers/isdn/gigaset/dummyll.c

@@ -0,0 +1,77 @@
+/*
+ * Dummy LL interface for the Gigaset driver
+ *
+ * Copyright (c) 2009 by Tilman Schmidt <tilman@imap.cc>.
+ *
+ * =====================================================================
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License as
+ *	published by the Free Software Foundation; either version 2 of
+ *	the License, or (at your option) any later version.
+ * =====================================================================
+ */
+
+#include <linux/export.h>
+#include "gigaset.h"
+
+void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb)
+{
+}
+EXPORT_SYMBOL_GPL(gigaset_skb_sent);
+
+void gigaset_skb_rcvd(struct bc_state *bcs, struct sk_buff *skb)
+{
+}
+EXPORT_SYMBOL_GPL(gigaset_skb_rcvd);
+
+void gigaset_isdn_rcv_err(struct bc_state *bcs)
+{
+}
+EXPORT_SYMBOL_GPL(gigaset_isdn_rcv_err);
+
+int gigaset_isdn_icall(struct at_state_t *at_state)
+{
+	return ICALL_IGNORE;
+}
+
+void gigaset_isdn_connD(struct bc_state *bcs)
+{
+}
+
+void gigaset_isdn_hupD(struct bc_state *bcs)
+{
+}
+
+void gigaset_isdn_connB(struct bc_state *bcs)
+{
+}
+
+void gigaset_isdn_hupB(struct bc_state *bcs)
+{
+}
+
+void gigaset_isdn_start(struct cardstate *cs)
+{
+}
+
+void gigaset_isdn_stop(struct cardstate *cs)
+{
+}
+
+int gigaset_isdn_regdev(struct cardstate *cs, const char *isdnid)
+{
+	return 0;
+}
+
+void gigaset_isdn_unregdev(struct cardstate *cs)
+{
+}
+
+void gigaset_isdn_regdrv(void)
+{
+	pr_info("no ISDN subsystem interface\n");
+}
+
+void gigaset_isdn_unregdrv(void)
+{
+}

drivers/isdn/gigaset/gigaset.h

@@ -0,0 +1,833 @@
+/*
+ * Siemens Gigaset 307x driver
+ * Common header file for all connection variants
+ *
+ * Written by Stefan Eilers
+ *        and Hansjoerg Lipp <hjlipp@web.de>
+ *
+ * =====================================================================
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License as
+ *	published by the Free Software Foundation; either version 2 of
+ *	the License, or (at your option) any later version.
+ * =====================================================================
+ */
+
+#ifndef GIGASET_H
+#define GIGASET_H
+
+/* define global prefix for pr_ macros in linux/kernel.h */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <linux/ctype.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/ppp_defs.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/list.h>
+#include <linux/atomic.h>
+
+#define GIG_VERSION {0, 5, 0, 0}
+#define GIG_COMPAT  {0, 4, 0, 0}
+
+#define MAX_REC_PARAMS 10	/* Max. number of params in response string */
+#define MAX_RESP_SIZE 511	/* Max. size of a response string */
+
+#define MAX_EVENTS 64		/* size of event queue */
+
+#define RBUFSIZE 8192
+
+#define GIG_TICK 100		/* in milliseconds */
+
+/* timeout values (unit: 1 sec) */
+#define INIT_TIMEOUT 1
+
+/* timeout values (unit: 0.1 sec) */
+#define RING_TIMEOUT 3		/* for additional parameters to RING */
+#define BAS_TIMEOUT 20		/* for response to Base USB ops */
+#define ATRDY_TIMEOUT 3		/* for HD_READY_SEND_ATDATA */
+
+#define BAS_RETRY 3		/* max. retries for base USB ops */
+
+#define MAXACT 3
+
+extern int gigaset_debuglevel;	/* "needs" cast to (enum debuglevel) */
+
+/* debug flags, combine by adding/bitwise OR */
+enum debuglevel {
+	DEBUG_INTR	  = 0x00008, /* interrupt processing */
+	DEBUG_CMD	  = 0x00020, /* sent/received LL commands */
+	DEBUG_STREAM	  = 0x00040, /* application data stream I/O events */
+	DEBUG_STREAM_DUMP = 0x00080, /* application data stream content */
+	DEBUG_LLDATA	  = 0x00100, /* sent/received LL data */
+	DEBUG_EVENT	  = 0x00200, /* event processing */
+	DEBUG_HDLC	  = 0x00800, /* M10x HDLC processing */
+	DEBUG_CHANNEL	  = 0x01000, /* channel allocation/deallocation */
+	DEBUG_TRANSCMD	  = 0x02000, /* AT-COMMANDS+RESPONSES */
+	DEBUG_MCMD	  = 0x04000, /* COMMANDS THAT ARE SENT VERY OFTEN */
+	DEBUG_INIT	  = 0x08000, /* (de)allocation+initialization of data
+					structures */
+	DEBUG_SUSPEND	  = 0x10000, /* suspend/resume processing */
+	DEBUG_OUTPUT	  = 0x20000, /* output to device */
+	DEBUG_ISO	  = 0x40000, /* isochronous transfers */
+	DEBUG_IF	  = 0x80000, /* character device operations */
+	DEBUG_USBREQ	  = 0x100000, /* USB communication (except payload
+					 data) */
+	DEBUG_LOCKCMD	  = 0x200000, /* AT commands and responses when
+					 MS_LOCKED */
+
+	DEBUG_ANY	  = 0x3fffff, /* print message if any of the others is
+					 activated */
+};
+
+#ifdef CONFIG_GIGASET_DEBUG
+
+#define gig_dbg(level, format, arg...)					\
+	do {								\
+		if (unlikely(((enum debuglevel)gigaset_debuglevel) & (level))) \
+			printk(KERN_DEBUG KBUILD_MODNAME ": " format "\n", \
+			       ## arg);					\
+	} while (0)
+#define DEBUG_DEFAULT (DEBUG_TRANSCMD | DEBUG_CMD | DEBUG_USBREQ)
+
+#else
+
+#define gig_dbg(level, format, arg...) do {} while (0)
+#define DEBUG_DEFAULT 0
+
+#endif
+
+void gigaset_dbg_buffer(enum debuglevel level, const unsigned char *msg,
+			size_t len, const unsigned char *buf);
+
+/* connection state */
+#define ZSAU_NONE			0
+#define ZSAU_PROCEEDING			1
+#define ZSAU_CALL_DELIVERED		2
+#define ZSAU_ACTIVE			3
+#define ZSAU_DISCONNECT_IND		4
+#define ZSAU_NULL			5
+#define ZSAU_DISCONNECT_REQ		6
+#define ZSAU_UNKNOWN			-1
+
+/* USB control transfer requests */
+#define OUT_VENDOR_REQ	(USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT)
+#define IN_VENDOR_REQ	(USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT)
+
+/* interrupt pipe messages */
+#define HD_B1_FLOW_CONTROL		0x80
+#define HD_B2_FLOW_CONTROL		0x81
+#define HD_RECEIVEATDATA_ACK		(0x35)		/* 3070 */
+#define HD_READY_SEND_ATDATA		(0x36)		/* 3070 */
+#define HD_OPEN_ATCHANNEL_ACK		(0x37)		/* 3070 */
+#define HD_CLOSE_ATCHANNEL_ACK		(0x38)		/* 3070 */
+#define HD_DEVICE_INIT_OK		(0x11)		/* ISurf USB + 3070 */
+#define HD_OPEN_B1CHANNEL_ACK		(0x51)		/* ISurf USB + 3070 */
+#define HD_OPEN_B2CHANNEL_ACK		(0x52)		/* ISurf USB + 3070 */
+#define HD_CLOSE_B1CHANNEL_ACK		(0x53)		/* ISurf USB + 3070 */
+#define HD_CLOSE_B2CHANNEL_ACK		(0x54)		/* ISurf USB + 3070 */
+#define HD_SUSPEND_END			(0x61)		/* ISurf USB */
+#define HD_RESET_INTERRUPT_PIPE_ACK	(0xFF)		/* ISurf USB + 3070 */
+
+/* control requests */
+#define	HD_OPEN_B1CHANNEL		(0x23)		/* ISurf USB + 3070 */
+#define	HD_CLOSE_B1CHANNEL		(0x24)		/* ISurf USB + 3070 */
+#define	HD_OPEN_B2CHANNEL		(0x25)		/* ISurf USB + 3070 */
+#define	HD_CLOSE_B2CHANNEL		(0x26)		/* ISurf USB + 3070 */
+#define HD_RESET_INTERRUPT_PIPE		(0x27)		/* ISurf USB + 3070 */
+#define	HD_DEVICE_INIT_ACK		(0x34)		/* ISurf USB + 3070 */
+#define	HD_WRITE_ATMESSAGE		(0x12)		/* 3070 */
+#define	HD_READ_ATMESSAGE		(0x13)		/* 3070 */
+#define	HD_OPEN_ATCHANNEL		(0x28)		/* 3070 */
+#define	HD_CLOSE_ATCHANNEL		(0x29)		/* 3070 */
+
+/* number of B channels supported by base driver */
+#define BAS_CHANNELS	2
+
+/* USB frames for isochronous transfer */
+#define BAS_FRAMETIME	1	/* number of milliseconds between frames */
+#define BAS_NUMFRAMES	8	/* number of frames per URB */
+#define BAS_MAXFRAME	16	/* allocated bytes per frame */
+#define BAS_NORMFRAME	8	/* send size without flow control */
+#define BAS_HIGHFRAME	10	/* "    "    with positive flow control */
+#define BAS_LOWFRAME	5	/* "    "    with negative flow control */
+#define BAS_CORRFRAMES	4	/* flow control multiplicator */
+
+#define BAS_INBUFSIZE	(BAS_MAXFRAME * BAS_NUMFRAMES)	/* size of isoc in buf
+							 * per URB */
+#define BAS_OUTBUFSIZE	4096		/* size of common isoc out buffer */
+#define BAS_OUTBUFPAD	BAS_MAXFRAME	/* size of pad area for isoc out buf */
+
+#define BAS_INURBS	3
+#define BAS_OUTURBS	3
+
+/* variable commands in struct bc_state */
+#define AT_ISO		0
+#define AT_DIAL		1
+#define AT_MSN		2
+#define AT_BC		3
+#define AT_PROTO	4
+#define AT_TYPE		5
+#define AT_CLIP		6
+/* total number */
+#define AT_NUM		7
+
+/* variables in struct at_state_t */
+/* - numeric */
+#define VAR_ZSAU	0
+#define VAR_ZDLE	1
+#define VAR_ZCTP	2
+/* total number */
+#define VAR_NUM		3
+/* - string */
+#define STR_NMBR	0
+#define STR_ZCPN	1
+#define STR_ZCON	2
+#define STR_ZBC		3
+#define STR_ZHLC	4
+/* total number */
+#define STR_NUM		5
+
+/* event types */
+#define EV_TIMEOUT	-105
+#define EV_IF_VER	-106
+#define EV_PROC_CIDMODE	-107
+#define EV_SHUTDOWN	-108
+#define EV_START	-110
+#define EV_STOP		-111
+#define EV_IF_LOCK	-112
+#define EV_ACCEPT	-114
+#define EV_DIAL		-115
+#define EV_HUP		-116
+#define EV_BC_OPEN	-117
+#define EV_BC_CLOSED	-118
+
+/* input state */
+#define INS_command	0x0001	/* receiving messages (not payload data) */
+#define INS_DLE_char	0x0002	/* DLE flag received (in DLE mode) */
+#define INS_byte_stuff	0x0004
+#define INS_have_data	0x0008
+#define INS_DLE_command	0x0020	/* DLE message start (<DLE> X) received */
+#define INS_flag_hunt	0x0040
+
+/* channel state */
+#define CHS_D_UP	0x01
+#define CHS_B_UP	0x02
+#define CHS_NOTIFY_LL	0x04
+
+#define ICALL_REJECT	0
+#define ICALL_ACCEPT	1
+#define ICALL_IGNORE	2
+
+/* device state */
+#define MS_UNINITIALIZED	0
+#define MS_INIT			1
+#define MS_LOCKED		2
+#define MS_SHUTDOWN		3
+#define MS_RECOVER		4
+#define MS_READY		5
+
+/* mode */
+#define M_UNKNOWN	0
+#define M_CONFIG	1
+#define M_UNIMODEM	2
+#define M_CID		3
+
+/* start mode */
+#define SM_LOCKED	0
+#define SM_ISDN		1 /* default */
+
+/* layer 2 protocols (AT^SBPR=...) */
+#define L2_BITSYNC	0
+#define L2_HDLC		1
+#define L2_VOICE	2
+
+struct gigaset_ops;
+struct gigaset_driver;
+
+struct usb_cardstate;
+struct ser_cardstate;
+struct bas_cardstate;
+
+struct bc_state;
+struct usb_bc_state;
+struct ser_bc_state;
+struct bas_bc_state;
+
+struct reply_t {
+	int	resp_code;	/* RSP_XXXX */
+	int	min_ConState;	/* <0 => ignore */
+	int	max_ConState;	/* <0 => ignore */
+	int	parameter;	/* e.g. ZSAU_XXXX <0: ignore*/
+	int	new_ConState;	/* <0 => ignore */
+	int	timeout;	/* >0 => *HZ; <=0 => TOUT_XXXX*/
+	int	action[MAXACT];	/* ACT_XXXX */
+	char	*command;	/* NULL==none */
+};
+
+extern struct reply_t gigaset_tab_cid[];
+extern struct reply_t gigaset_tab_nocid[];
+
+struct inbuf_t {
+	struct cardstate	*cs;
+	int			inputstate;
+	int			head, tail;
+	unsigned char		data[RBUFSIZE];
+};
+
+/* isochronous write buffer structure
+ * circular buffer with pad area for extraction of complete USB frames
+ * - data[read..nextread-1] is valid data already submitted to the USB subsystem
+ * - data[nextread..write-1] is valid data yet to be sent
+ * - data[write] is the next byte to write to
+ *   - in byte-oriented L2 procotols, it is completely free
+ *   - in bit-oriented L2 procotols, it may contain a partial byte of valid data
+ * - data[write+1..read-1] is free
+ * - wbits is the number of valid data bits in data[write], starting at the LSB
+ * - writesem is the semaphore for writing to the buffer:
+ *   if writesem <= 0, data[write..read-1] is currently being written to
+ * - idle contains the byte value to repeat when the end of valid data is
+ *   reached; if nextread==write (buffer contains no data to send), either the
+ *   BAS_OUTBUFPAD bytes immediately before data[write] (if
+ *   write>=BAS_OUTBUFPAD) or those of the pad area (if write<BAS_OUTBUFPAD)
+ *   are also filled with that value
+ */
+struct isowbuf_t {
+	int		read;
+	int		nextread;
+	int		write;
+	atomic_t	writesem;
+	int		wbits;
+	unsigned char	data[BAS_OUTBUFSIZE + BAS_OUTBUFPAD];
+	unsigned char	idle;
+};
+
+/* isochronous write URB context structure
+ * data to be stored along with the URB and retrieved when it is returned
+ * as completed by the USB subsystem
+ * - urb: pointer to the URB itself
+ * - bcs: pointer to the B Channel control structure
+ * - limit: end of write buffer area covered by this URB
+ * - status: URB completion status
+ */
+struct isow_urbctx_t {
+	struct urb *urb;
+	struct bc_state *bcs;
+	int limit;
+	int status;
+};
+
+/* AT state structure
+ * data associated with the state of an ISDN connection, whether or not
+ * it is currently assigned a B channel
+ */
+struct at_state_t {
+	struct list_head	list;
+	int			waiting;
+	int			getstring;
+	unsigned		timer_index;
+	unsigned long		timer_expires;
+	int			timer_active;
+	unsigned int		ConState;	/* State of connection */
+	struct reply_t		*replystruct;
+	int			cid;
+	int			int_var[VAR_NUM];	/* see VAR_XXXX */
+	char			*str_var[STR_NUM];	/* see STR_XXXX */
+	unsigned		pending_commands;	/* see PC_XXXX */
+	unsigned		seq_index;
+
+	struct cardstate	*cs;
+	struct bc_state		*bcs;
+};
+
+struct event_t {
+	int type;
+	void *ptr, *arg;
+	int parameter;
+	int cid;
+	struct at_state_t *at_state;
+};
+
+/* This buffer holds all information about the used B-Channel */
+struct bc_state {
+	struct sk_buff *tx_skb;		/* Current transfer buffer to modem */
+	struct sk_buff_head squeue;	/* B-Channel send Queue */
+
+	/* Variables for debugging .. */
+	int corrupted;			/* Counter for corrupted packages */
+	int trans_down;			/* Counter of packages (downstream) */
+	int trans_up;			/* Counter of packages (upstream) */
+
+	struct at_state_t at_state;
+
+	/* receive buffer */
+	unsigned rx_bufsize;		/* max size accepted by application */
+	struct sk_buff *rx_skb;
+	__u16 rx_fcs;
+	int inputstate;			/* see INS_XXXX */
+
+	int channel;
+
+	struct cardstate *cs;
+
+	unsigned chstate;		/* bitmap (CHS_*) */
+	int ignore;
+	unsigned proto2;		/* layer 2 protocol (L2_*) */
+	char *commands[AT_NUM];		/* see AT_XXXX */
+
+#ifdef CONFIG_GIGASET_DEBUG
+	int emptycount;
+#endif
+	int busy;
+	int use_count;
+
+	/* private data of hardware drivers */
+	union {
+		struct ser_bc_state *ser;	/* serial hardware driver */
+		struct usb_bc_state *usb;	/* usb hardware driver (m105) */
+		struct bas_bc_state *bas;	/* usb hardware driver (base) */
+	} hw;
+
+	void *ap;			/* associated LL application */
+	int apconnstate;		/* LL application connection state */
+	spinlock_t aplock;
+};
+
+struct cardstate {
+	struct gigaset_driver *driver;
+	unsigned minor_index;
+	struct device *dev;
+	struct device *tty_dev;
+	unsigned flags;
+
+	const struct gigaset_ops *ops;
+
+	/* Stuff to handle communication */
+	wait_queue_head_t waitqueue;
+	int waiting;
+	int mode;			/* see M_XXXX */
+	int mstate;			/* Modem state: see MS_XXXX */
+					/* only changed by the event layer */
+	int cmd_result;
+
+	int channels;
+	struct bc_state *bcs;		/* Array of struct bc_state */
+
+	int onechannel;			/* data and commands transmitted in one
+					   stream (M10x) */
+
+	spinlock_t lock;
+	struct at_state_t at_state;	/* at_state_t for cid == 0 */
+	struct list_head temp_at_states;/* list of temporary "struct
+					   at_state_t"s without B channel */
+
+	struct inbuf_t *inbuf;
+
+	struct cmdbuf_t *cmdbuf, *lastcmdbuf;
+	spinlock_t cmdlock;
+	unsigned curlen, cmdbytes;
+
+	struct tty_port port;
+	struct tasklet_struct if_wake_tasklet;
+	unsigned control_state;
+
+	unsigned fwver[4];
+	int gotfwver;
+
+	unsigned running;		/* !=0 if events are handled */
+	unsigned connected;		/* !=0 if hardware is connected */
+	unsigned isdn_up;		/* !=0 after gigaset_isdn_start() */
+
+	unsigned cidmode;
+
+	int myid;			/* id for communication with LL */
+	void *iif;			/* LL interface structure */
+	unsigned short hw_hdr_len;	/* headroom needed in data skbs */
+
+	struct reply_t *tabnocid;
+	struct reply_t *tabcid;
+	int cs_init;
+	int ignoreframes;		/* frames to ignore after setting up the
+					   B channel */
+	struct mutex mutex;		/* locks this structure:
+					 *   connected is not changed,
+					 *   hardware_up is not changed,
+					 *   MState is not changed to or from
+					 *   MS_LOCKED */
+
+	struct timer_list timer;
+	int retry_count;
+	int dle;			/* !=0 if DLE mode is active
+					   (ZDLE=1 received -- M10x only) */
+	int cur_at_seq;			/* sequence of AT commands being
+					   processed */
+	int curchannel;			/* channel those commands are meant
+					   for */
+	int commands_pending;		/* flag(s) in xxx.commands_pending have
+					   been set */
+	struct tasklet_struct
+		event_tasklet;		/* tasklet for serializing AT commands.
+					 * Scheduled
+					 *   -> for modem reponses (and
+					 *      incoming data for M10x)
+					 *   -> on timeout
+					 *   -> after setting bits in
+					 *      xxx.at_state.pending_command
+					 *      (e.g. command from LL) */
+	struct tasklet_struct
+		write_tasklet;		/* tasklet for serial output
+					 * (not used in base driver) */
+
+	/* event queue */
+	struct event_t events[MAX_EVENTS];
+	unsigned ev_tail, ev_head;
+	spinlock_t ev_lock;
+
+	/* current modem response */
+	unsigned char respdata[MAX_RESP_SIZE + 1];
+	unsigned cbytes;
+
+	/* private data of hardware drivers */
+	union {
+		struct usb_cardstate *usb; /* USB hardware driver (m105) */
+		struct ser_cardstate *ser; /* serial hardware driver */
+		struct bas_cardstate *bas; /* USB hardware driver (base) */
+	} hw;
+};
+
+struct gigaset_driver {
+	struct list_head list;
+	spinlock_t lock;		/* locks minor tables and blocked */
+	struct tty_driver *tty;
+	unsigned have_tty;
+	unsigned minor;
+	unsigned minors;
+	struct cardstate *cs;
+	int blocked;
+
+	const struct gigaset_ops *ops;
+	struct module *owner;
+};
+
+struct cmdbuf_t {
+	struct cmdbuf_t *next, *prev;
+	int len, offset;
+	struct tasklet_struct *wake_tasklet;
+	unsigned char buf[0];
+};
+
+struct bas_bc_state {
+	/* isochronous output state */
+	int		running;
+	atomic_t	corrbytes;
+	spinlock_t	isooutlock;
+	struct isow_urbctx_t	isoouturbs[BAS_OUTURBS];
+	struct isow_urbctx_t	*isooutdone, *isooutfree, *isooutovfl;
+	struct isowbuf_t	*isooutbuf;
+	unsigned numsub;		/* submitted URB counter
+					   (for diagnostic messages only) */
+	struct tasklet_struct	sent_tasklet;
+
+	/* isochronous input state */
+	spinlock_t isoinlock;
+	struct urb *isoinurbs[BAS_INURBS];
+	unsigned char isoinbuf[BAS_INBUFSIZE * BAS_INURBS];
+	struct urb *isoindone;		/* completed isoc read URB */
+	int isoinstatus;		/* status of completed URB */
+	int loststatus;			/* status of dropped URB */
+	unsigned isoinlost;		/* number of bytes lost */
+	/* state of bit unstuffing algorithm
+	   (in addition to BC_state.inputstate) */
+	unsigned seqlen;		/* number of '1' bits not yet
+					   unstuffed */
+	unsigned inbyte, inbits;	/* collected bits for next byte */
+	/* statistics */
+	unsigned goodbytes;		/* bytes correctly received */
+	unsigned alignerrs;		/* frames with incomplete byte at end */
+	unsigned fcserrs;		/* FCS errors */
+	unsigned frameerrs;		/* framing errors */
+	unsigned giants;		/* long frames */
+	unsigned runts;			/* short frames */
+	unsigned aborts;		/* HDLC aborts */
+	unsigned shared0s;		/* '0' bits shared between flags */
+	unsigned stolen0s;		/* '0' stuff bits also serving as
+					   leading flag bits */
+	struct tasklet_struct rcvd_tasklet;
+};
+
+struct gigaset_ops {
+	/* Called from ev-layer.c/interface.c for sending AT commands to the
+	   device */
+	int (*write_cmd)(struct cardstate *cs, struct cmdbuf_t *cb);
+
+	/* Called from interface.c for additional device control */
+	int (*write_room)(struct cardstate *cs);
+	int (*chars_in_buffer)(struct cardstate *cs);
+	int (*brkchars)(struct cardstate *cs, const unsigned char buf[6]);
+
+	/* Called from ev-layer.c after setting up connection
+	 * Should call gigaset_bchannel_up(), when finished. */
+	int (*init_bchannel)(struct bc_state *bcs);
+
+	/* Called from ev-layer.c after hanging up
+	 * Should call gigaset_bchannel_down(), when finished. */
+	int (*close_bchannel)(struct bc_state *bcs);
+
+	/* Called by gigaset_initcs() for setting up bcs->hw.xxx */
+	int (*initbcshw)(struct bc_state *bcs);
+
+	/* Called by gigaset_freecs() for freeing bcs->hw.xxx */
+	void (*freebcshw)(struct bc_state *bcs);
+
+	/* Called by gigaset_bchannel_down() for resetting bcs->hw.xxx */
+	void (*reinitbcshw)(struct bc_state *bcs);
+
+	/* Called by gigaset_initcs() for setting up cs->hw.xxx */
+	int (*initcshw)(struct cardstate *cs);
+
+	/* Called by gigaset_freecs() for freeing cs->hw.xxx */
+	void (*freecshw)(struct cardstate *cs);
+
+	/* Called from common.c/interface.c for additional serial port
+	   control */
+	int (*set_modem_ctrl)(struct cardstate *cs, unsigned old_state,
+			      unsigned new_state);
+	int (*baud_rate)(struct cardstate *cs, unsigned cflag);
+	int (*set_line_ctrl)(struct cardstate *cs, unsigned cflag);
+
+	/* Called from LL interface to put an skb into the send-queue.
+	 * After sending is completed, gigaset_skb_sent() must be called
+	 * with the skb's link layer header preserved. */
+	int (*send_skb)(struct bc_state *bcs, struct sk_buff *skb);
+
+	/* Called from ev-layer.c to process a block of data
+	 * received through the common/control channel. */
+	void (*handle_input)(struct inbuf_t *inbuf);
+
+};
+
+/* = Common structures and definitions =======================================
+ */
+
+/* Parser states for DLE-Event:
+ * <DLE-EVENT>: <DLE_FLAG> "X" <EVENT> <DLE_FLAG> "."
+ * <DLE_FLAG>:  0x10
+ * <EVENT>:     ((a-z)* | (A-Z)* | (0-10)*)+
+ */
+#define DLE_FLAG	0x10
+
+/* ===========================================================================
+ *  Functions implemented in asyncdata.c
+ */
+
+/* Called from LL interface to put an skb into the send queue. */
+int gigaset_m10x_send_skb(struct bc_state *bcs, struct sk_buff *skb);
+
+/* Called from ev-layer.c to process a block of data
+ * received through the common/control channel. */
+void gigaset_m10x_input(struct inbuf_t *inbuf);
+
+/* ===========================================================================
+ *  Functions implemented in isocdata.c
+ */
+
+/* Called from LL interface to put an skb into the send queue. */
+int gigaset_isoc_send_skb(struct bc_state *bcs, struct sk_buff *skb);
+
+/* Called from ev-layer.c to process a block of data
+ * received through the common/control channel. */
+void gigaset_isoc_input(struct inbuf_t *inbuf);
+
+/* Called from bas-gigaset.c to process a block of data
+ * received through the isochronous channel */
+void gigaset_isoc_receive(unsigned char *src, unsigned count,
+			  struct bc_state *bcs);
+
+/* Called from bas-gigaset.c to put a block of data
+ * into the isochronous output buffer */
+int gigaset_isoc_buildframe(struct bc_state *bcs, unsigned char *in, int len);
+
+/* Called from bas-gigaset.c to initialize the isochronous output buffer */
+void gigaset_isowbuf_init(struct isowbuf_t *iwb, unsigned char idle);
+
+/* Called from bas-gigaset.c to retrieve a block of bytes for sending */
+int gigaset_isowbuf_getbytes(struct isowbuf_t *iwb, int size);
+
+/* ===========================================================================
+ *  Functions implemented in LL interface
+ */
+
+/* Called from common.c for setting up/shutting down with the ISDN subsystem */
+void gigaset_isdn_regdrv(void);
+void gigaset_isdn_unregdrv(void);
+int gigaset_isdn_regdev(struct cardstate *cs, const char *isdnid);
+void gigaset_isdn_unregdev(struct cardstate *cs);
+
+/* Called from hardware module to indicate completion of an skb */
+void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb);
+void gigaset_skb_rcvd(struct bc_state *bcs, struct sk_buff *skb);
+void gigaset_isdn_rcv_err(struct bc_state *bcs);
+
+/* Called from common.c/ev-layer.c to indicate events relevant to the LL */
+void gigaset_isdn_start(struct cardstate *cs);
+void gigaset_isdn_stop(struct cardstate *cs);
+int gigaset_isdn_icall(struct at_state_t *at_state);
+void gigaset_isdn_connD(struct bc_state *bcs);
+void gigaset_isdn_hupD(struct bc_state *bcs);
+void gigaset_isdn_connB(struct bc_state *bcs);
+void gigaset_isdn_hupB(struct bc_state *bcs);
+
+/* ===========================================================================
+ *  Functions implemented in ev-layer.c
+ */
+
+/* tasklet called from common.c to process queued events */
+void gigaset_handle_event(unsigned long data);
+
+/* called from isocdata.c / asyncdata.c
+ * when a complete modem response line has been received */
+void gigaset_handle_modem_response(struct cardstate *cs);
+
+/* ===========================================================================
+ *  Functions implemented in proc.c
+ */
+
+/* initialize sysfs for device */
+void gigaset_init_dev_sysfs(struct cardstate *cs);
+void gigaset_free_dev_sysfs(struct cardstate *cs);
+
+/* ===========================================================================
+ *  Functions implemented in common.c/gigaset.h
+ */
+
+void gigaset_bcs_reinit(struct bc_state *bcs);
+void gigaset_at_init(struct at_state_t *at_state, struct bc_state *bcs,
+		     struct cardstate *cs, int cid);
+int gigaset_get_channel(struct bc_state *bcs);
+struct bc_state *gigaset_get_free_channel(struct cardstate *cs);
+void gigaset_free_channel(struct bc_state *bcs);
+int gigaset_get_channels(struct cardstate *cs);
+void gigaset_free_channels(struct cardstate *cs);
+void gigaset_block_channels(struct cardstate *cs);
+
+/* Allocate and initialize driver structure. */
+struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors,
+					  const char *procname,
+					  const char *devname,
+					  const struct gigaset_ops *ops,
+					  struct module *owner);
+
+/* Deallocate driver structure. */
+void gigaset_freedriver(struct gigaset_driver *drv);
+
+struct cardstate *gigaset_get_cs_by_tty(struct tty_struct *tty);
+struct cardstate *gigaset_get_cs_by_id(int id);
+void gigaset_blockdriver(struct gigaset_driver *drv);
+
+/* Allocate and initialize card state. Calls hardware dependent
+   gigaset_init[b]cs(). */
+struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels,
+				 int onechannel, int ignoreframes,
+				 int cidmode, const char *modulename);
+
+/* Free card state. Calls hardware dependent gigaset_free[b]cs(). */
+void gigaset_freecs(struct cardstate *cs);
+
+/* Tell common.c that hardware and driver are ready. */
+int gigaset_start(struct cardstate *cs);
+
+/* Tell common.c that the device is not present any more. */
+void gigaset_stop(struct cardstate *cs);
+
+/* Tell common.c that the driver is being unloaded. */
+int gigaset_shutdown(struct cardstate *cs);
+
+/* Tell common.c that an skb has been sent. */
+void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb);
+
+/* Append event to the queue.
+ * Returns NULL on failure or a pointer to the event on success.
+ * ptr must be kmalloc()ed (and not be freed by the caller).
+ */
+struct event_t *gigaset_add_event(struct cardstate *cs,
+				  struct at_state_t *at_state, int type,
+				  void *ptr, int parameter, void *arg);
+
+/* Called on CONFIG1 command from frontend. */
+int gigaset_enterconfigmode(struct cardstate *cs);
+
+/* cs->lock must not be locked */
+static inline void gigaset_schedule_event(struct cardstate *cs)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&cs->lock, flags);
+	if (cs->running)
+		tasklet_schedule(&cs->event_tasklet);
+	spin_unlock_irqrestore(&cs->lock, flags);
+}
+
+/* Tell common.c that B channel has been closed. */
+/* cs->lock must not be locked */
+static inline void gigaset_bchannel_down(struct bc_state *bcs)
+{
+	gigaset_add_event(bcs->cs, &bcs->at_state, EV_BC_CLOSED, NULL, 0, NULL);
+	gigaset_schedule_event(bcs->cs);
+}
+
+/* Tell common.c that B channel has been opened. */
+/* cs->lock must not be locked */
+static inline void gigaset_bchannel_up(struct bc_state *bcs)
+{
+	gigaset_add_event(bcs->cs, &bcs->at_state, EV_BC_OPEN, NULL, 0, NULL);
+	gigaset_schedule_event(bcs->cs);
+}
+
+/* set up next receive skb for data mode */
+static inline struct sk_buff *gigaset_new_rx_skb(struct bc_state *bcs)
+{
+	struct cardstate *cs = bcs->cs;
+	unsigned short hw_hdr_len = cs->hw_hdr_len;
+
+	if (bcs->ignore) {
+		bcs->rx_skb = NULL;
+	} else {
+		bcs->rx_skb = dev_alloc_skb(bcs->rx_bufsize + hw_hdr_len);
+		if (bcs->rx_skb == NULL)
+			dev_warn(cs->dev, "could not allocate skb\n");
+		else
+			skb_reserve(bcs->rx_skb, hw_hdr_len);
+	}
+	return bcs->rx_skb;
+}
+
+/* append received bytes to inbuf */
+int gigaset_fill_inbuf(struct inbuf_t *inbuf, const unsigned char *src,
+		       unsigned numbytes);
+
+/* ===========================================================================
+ *  Functions implemented in interface.c
+ */
+
+/* initialize interface */
+void gigaset_if_initdriver(struct gigaset_driver *drv, const char *procname,
+			   const char *devname);
+/* release interface */
+void gigaset_if_freedriver(struct gigaset_driver *drv);
+/* add minor */
+void gigaset_if_init(struct cardstate *cs);
+/* remove minor */
+void gigaset_if_free(struct cardstate *cs);
+/* device received data */
+void gigaset_if_receive(struct cardstate *cs,
+			unsigned char *buffer, size_t len);
+
+#endif

drivers/isdn/gigaset/i4l.c

@@ -0,0 +1,695 @@
+/*
+ * Stuff used by all variants of the driver
+ *
+ * Copyright (c) 2001 by Stefan Eilers,
+ *                       Hansjoerg Lipp <hjlipp@web.de>,
+ *                       Tilman Schmidt <tilman@imap.cc>.
+ *
+ * =====================================================================
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License as
+ *	published by the Free Software Foundation; either version 2 of
+ *	the License, or (at your option) any later version.
+ * =====================================================================
+ */
+
+#include "gigaset.h"
+#include <linux/isdnif.h>
+#include <linux/export.h>
+
+#define SBUFSIZE	4096	/* sk_buff payload size */
+#define TRANSBUFSIZE	768	/* bytes per skb for transparent receive */
+#define HW_HDR_LEN	2	/* Header size used to store ack info */
+#define MAX_BUF_SIZE	(SBUFSIZE - HW_HDR_LEN)	/* max data packet from LL */
+
+/* == Handling of I4L IO =====================================================*/
+
+/* writebuf_from_LL
+ * called by LL to transmit data on an open channel
+ * inserts the buffer data into the send queue and starts the transmission
+ * Note that this operation must not sleep!
+ * When the buffer is processed completely, gigaset_skb_sent() should be called.
+ * parameters:
+ *	driverID	driver ID as assigned by LL
+ *	channel		channel number
+ *	ack		if != 0 LL wants to be notified on completion via
+ *			statcallb(ISDN_STAT_BSENT)
+ *	skb		skb containing data to send
+ * return value:
+ *	number of accepted bytes
+ *	0 if temporarily unable to accept data (out of buffer space)
+ *	<0 on error (eg. -EINVAL)
+ */
+static int writebuf_from_LL(int driverID, int channel, int ack,
+			    struct sk_buff *skb)
+{
+	struct cardstate *cs = gigaset_get_cs_by_id(driverID);
+	struct bc_state *bcs;
+	unsigned char *ack_header;
+	unsigned len;
+
+	if (!cs) {
+		pr_err("%s: invalid driver ID (%d)\n", __func__, driverID);
+		return -ENODEV;
+	}
+	if (channel < 0 || channel >= cs->channels) {
+		dev_err(cs->dev, "%s: invalid channel ID (%d)\n",
+			__func__, channel);
+		return -ENODEV;
+	}
+	bcs = &cs->bcs[channel];
+
+	/* can only handle linear sk_buffs */
+	if (skb_linearize(skb) < 0) {
+		dev_err(cs->dev, "%s: skb_linearize failed\n", __func__);
+		return -ENOMEM;
+	}
+	len = skb->len;
+
+	gig_dbg(DEBUG_LLDATA,
+		"Receiving data from LL (id: %d, ch: %d, ack: %d, sz: %d)",
+		driverID, channel, ack, len);
+
+	if (!len) {
+		if (ack)
+			dev_notice(cs->dev, "%s: not ACKing empty packet\n",
+				   __func__);
+		return 0;
+	}
+	if (len > MAX_BUF_SIZE) {
+		dev_err(cs->dev, "%s: packet too large (%d bytes)\n",
+			__func__, len);
+		return -EINVAL;
+	}
+
+	/* set up acknowledgement header */
+	if (skb_headroom(skb) < HW_HDR_LEN) {
+		/* should never happen */
+		dev_err(cs->dev, "%s: insufficient skb headroom\n", __func__);
+		return -ENOMEM;
+	}
+	skb_set_mac_header(skb, -HW_HDR_LEN);
+	skb->mac_len = HW_HDR_LEN;
+	ack_header = skb_mac_header(skb);
+	if (ack) {
+		ack_header[0] = len & 0xff;
+		ack_header[1] = len >> 8;
+	} else {
+		ack_header[0] = ack_header[1] = 0;
+	}
+	gig_dbg(DEBUG_MCMD, "skb: len=%u, ack=%d: %02x %02x",
+		len, ack, ack_header[0], ack_header[1]);
+
+	/* pass to device-specific module */
+	return cs->ops->send_skb(bcs, skb);
+}
+
+/**
+ * gigaset_skb_sent() - acknowledge sending an skb
+ * @bcs:	B channel descriptor structure.
+ * @skb:	sent data.
+ *
+ * Called by hardware module {bas,ser,usb}_gigaset when the data in a
+ * skb has been successfully sent, for signalling completion to the LL.
+ */
+void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb)
+{
+	isdn_if *iif = bcs->cs->iif;
+	unsigned char *ack_header = skb_mac_header(skb);
+	unsigned len;
+	isdn_ctrl response;
+
+	++bcs->trans_up;
+
+	if (skb->len)
+		dev_warn(bcs->cs->dev, "%s: skb->len==%d\n",
+			 __func__, skb->len);
+
+	len = ack_header[0] + ((unsigned) ack_header[1] << 8);
+	if (len) {
+		gig_dbg(DEBUG_MCMD, "ACKing to LL (id: %d, ch: %d, sz: %u)",
+			bcs->cs->myid, bcs->channel, len);
+
+		response.driver = bcs->cs->myid;
+		response.command = ISDN_STAT_BSENT;
+		response.arg = bcs->channel;
+		response.parm.length = len;
+		iif->statcallb(&response);
+	}
+}
+EXPORT_SYMBOL_GPL(gigaset_skb_sent);
+
+/**
+ * gigaset_skb_rcvd() - pass received skb to LL
+ * @bcs:	B channel descriptor structure.
+ * @skb:	received data.
+ *
+ * Called by hardware module {bas,ser,usb}_gigaset when user data has
+ * been successfully received, for passing to the LL.
+ * Warning: skb must not be accessed anymore!
+ */
+void gigaset_skb_rcvd(struct bc_state *bcs, struct sk_buff *skb)
+{
+	isdn_if *iif = bcs->cs->iif;
+
+	iif->rcvcallb_skb(bcs->cs->myid, bcs->channel, skb);
+	bcs->trans_down++;
+}
+EXPORT_SYMBOL_GPL(gigaset_skb_rcvd);
+
+/**
+ * gigaset_isdn_rcv_err() - signal receive error
+ * @bcs:	B channel descriptor structure.
+ *
+ * Called by hardware module {bas,ser,usb}_gigaset when a receive error
+ * has occurred, for signalling to the LL.
+ */
+void gigaset_isdn_rcv_err(struct bc_state *bcs)
+{
+	isdn_if *iif = bcs->cs->iif;
+	isdn_ctrl response;
+
+	/* if currently ignoring packets, just count down */
+	if (bcs->ignore) {
+		bcs->ignore--;
+		return;
+	}
+
+	/* update statistics */
+	bcs->corrupted++;
+
+	/* error -> LL */
+	gig_dbg(DEBUG_CMD, "sending L1ERR");
+	response.driver = bcs->cs->myid;
+	response.command = ISDN_STAT_L1ERR;
+	response.arg = bcs->channel;
+	response.parm.errcode = ISDN_STAT_L1ERR_RECV;
+	iif->statcallb(&response);
+}
+EXPORT_SYMBOL_GPL(gigaset_isdn_rcv_err);
+
+/* This function will be called by LL to send commands
+ * NOTE: LL ignores the returned value, for commands other than ISDN_CMD_IOCTL,
+ * so don't put too much effort into it.
+ */
+static int command_from_LL(isdn_ctrl *cntrl)
+{
+	struct cardstate *cs;
+	struct bc_state *bcs;
+	int retval = 0;
+	char **commands;
+	int ch;
+	int i;
+	size_t l;
+
+	gig_dbg(DEBUG_CMD, "driver: %d, command: %d, arg: 0x%lx",
+		cntrl->driver, cntrl->command, cntrl->arg);
+
+	cs = gigaset_get_cs_by_id(cntrl->driver);
+	if (cs == NULL) {
+		pr_err("%s: invalid driver ID (%d)\n", __func__, cntrl->driver);
+		return -ENODEV;
+	}
+	ch = cntrl->arg & 0xff;
+
+	switch (cntrl->command) {
+	case ISDN_CMD_IOCTL:
+		dev_warn(cs->dev, "ISDN_CMD_IOCTL not supported\n");
+		return -EINVAL;
+
+	case ISDN_CMD_DIAL:
+		gig_dbg(DEBUG_CMD,
+			"ISDN_CMD_DIAL (phone: %s, msn: %s, si1: %d, si2: %d)",
+			cntrl->parm.setup.phone, cntrl->parm.setup.eazmsn,
+			cntrl->parm.setup.si1, cntrl->parm.setup.si2);
+
+		if (ch >= cs->channels) {
+			dev_err(cs->dev,
+				"ISDN_CMD_DIAL: invalid channel (%d)\n", ch);
+			return -EINVAL;
+		}
+		bcs = cs->bcs + ch;
+		if (gigaset_get_channel(bcs) < 0) {
+			dev_err(cs->dev, "ISDN_CMD_DIAL: channel not free\n");
+			return -EBUSY;
+		}
+		switch (bcs->proto2) {
+		case L2_HDLC:
+			bcs->rx_bufsize = SBUFSIZE;
+			break;
+		default:			/* assume transparent */
+			bcs->rx_bufsize = TRANSBUFSIZE;
+		}
+		dev_kfree_skb(bcs->rx_skb);
+		gigaset_new_rx_skb(bcs);
+
+		commands = kzalloc(AT_NUM * (sizeof *commands), GFP_ATOMIC);
+		if (!commands) {
+			gigaset_free_channel(bcs);
+			dev_err(cs->dev, "ISDN_CMD_DIAL: out of memory\n");
+			return -ENOMEM;
+		}
+
+		l = 3 + strlen(cntrl->parm.setup.phone);
+		commands[AT_DIAL] = kmalloc(l, GFP_ATOMIC);
+		if (!commands[AT_DIAL])
+			goto oom;
+		if (cntrl->parm.setup.phone[0] == '*' &&
+		    cntrl->parm.setup.phone[1] == '*') {
+			/* internal call: translate ** prefix to CTP value */
+			commands[AT_TYPE] = kstrdup("^SCTP=0\r", GFP_ATOMIC);
+			if (!commands[AT_TYPE])
+				goto oom;
+			snprintf(commands[AT_DIAL], l,
+				 "D%s\r", cntrl->parm.setup.phone + 2);
+		} else {
+			commands[AT_TYPE] = kstrdup("^SCTP=1\r", GFP_ATOMIC);
+			if (!commands[AT_TYPE])
+				goto oom;
+			snprintf(commands[AT_DIAL], l,
+				 "D%s\r", cntrl->parm.setup.phone);
+		}
+
+		l = strlen(cntrl->parm.setup.eazmsn);
+		if (l) {
+			l += 8;
+			commands[AT_MSN] = kmalloc(l, GFP_ATOMIC);
+			if (!commands[AT_MSN])
+				goto oom;
+			snprintf(commands[AT_MSN], l, "^SMSN=%s\r",
+				 cntrl->parm.setup.eazmsn);
+		}
+
+		switch (cntrl->parm.setup.si1) {
+		case 1:		/* audio */
+			/* BC = 9090A3: 3.1 kHz audio, A-law */
+			commands[AT_BC] = kstrdup("^SBC=9090A3\r", GFP_ATOMIC);
+			if (!commands[AT_BC])
+				goto oom;
+			break;
+		case 7:		/* data */
+		default:	/* hope the app knows what it is doing */
+			/* BC = 8890: unrestricted digital information */
+			commands[AT_BC] = kstrdup("^SBC=8890\r", GFP_ATOMIC);
+			if (!commands[AT_BC])
+				goto oom;
+		}
+		/* ToDo: other si1 values, inspect si2, set HLC/LLC */
+
+		commands[AT_PROTO] = kmalloc(9, GFP_ATOMIC);
+		if (!commands[AT_PROTO])
+			goto oom;
+		snprintf(commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2);
+
+		commands[AT_ISO] = kmalloc(9, GFP_ATOMIC);
+		if (!commands[AT_ISO])
+			goto oom;
+		snprintf(commands[AT_ISO], 9, "^SISO=%u\r",
+			 (unsigned) bcs->channel + 1);
+
+		if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, commands,
+				       bcs->at_state.seq_index, NULL)) {
+			for (i = 0; i < AT_NUM; ++i)
+				kfree(commands[i]);
+			kfree(commands);
+			gigaset_free_channel(bcs);
+			return -ENOMEM;
+		}
+		gigaset_schedule_event(cs);
+		break;
+	case ISDN_CMD_ACCEPTD:
+		gig_dbg(DEBUG_CMD, "ISDN_CMD_ACCEPTD");
+		if (ch >= cs->channels) {
+			dev_err(cs->dev,
+				"ISDN_CMD_ACCEPTD: invalid channel (%d)\n", ch);
+			return -EINVAL;
+		}
+		bcs = cs->bcs + ch;
+		switch (bcs->proto2) {
+		case L2_HDLC:
+			bcs->rx_bufsize = SBUFSIZE;
+			break;
+		default:			/* assume transparent */
+			bcs->rx_bufsize = TRANSBUFSIZE;
+		}
+		dev_kfree_skb(bcs->rx_skb);
+		gigaset_new_rx_skb(bcs);
+		if (!gigaset_add_event(cs, &bcs->at_state,
+				       EV_ACCEPT, NULL, 0, NULL))
+			return -ENOMEM;
+		gigaset_schedule_event(cs);
+
+		break;
+	case ISDN_CMD_HANGUP:
+		gig_dbg(DEBUG_CMD, "ISDN_CMD_HANGUP");
+		if (ch >= cs->channels) {
+			dev_err(cs->dev,
+				"ISDN_CMD_HANGUP: invalid channel (%d)\n", ch);
+			return -EINVAL;
+		}
+		bcs = cs->bcs + ch;
+		if (!gigaset_add_event(cs, &bcs->at_state,
+				       EV_HUP, NULL, 0, NULL))
+			return -ENOMEM;
+		gigaset_schedule_event(cs);
+
+		break;
+	case ISDN_CMD_CLREAZ: /* Do not signal incoming signals */
+		dev_info(cs->dev, "ignoring ISDN_CMD_CLREAZ\n");
+		break;
+	case ISDN_CMD_SETEAZ: /* Signal incoming calls for given MSN */
+		dev_info(cs->dev, "ignoring ISDN_CMD_SETEAZ (%s)\n",
+			 cntrl->parm.num);
+		break;
+	case ISDN_CMD_SETL2: /* Set L2 to given protocol */
+		if (ch >= cs->channels) {
+			dev_err(cs->dev,
+				"ISDN_CMD_SETL2: invalid channel (%d)\n", ch);
+			return -EINVAL;
+		}
+		bcs = cs->bcs + ch;
+		if (bcs->chstate & CHS_D_UP) {
+			dev_err(cs->dev,
+				"ISDN_CMD_SETL2: channel active (%d)\n", ch);
+			return -EINVAL;
+		}
+		switch (cntrl->arg >> 8) {
+		case ISDN_PROTO_L2_HDLC:
+			gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL2: setting L2_HDLC");
+			bcs->proto2 = L2_HDLC;
+			break;
+		case ISDN_PROTO_L2_TRANS:
+			gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL2: setting L2_VOICE");
+			bcs->proto2 = L2_VOICE;
+			break;
+		default:
+			dev_err(cs->dev,
+				"ISDN_CMD_SETL2: unsupported protocol (%lu)\n",
+				cntrl->arg >> 8);
+			return -EINVAL;
+		}
+		break;
+	case ISDN_CMD_SETL3: /* Set L3 to given protocol */
+		gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL3");
+		if (ch >= cs->channels) {
+			dev_err(cs->dev,
+				"ISDN_CMD_SETL3: invalid channel (%d)\n", ch);
+			return -EINVAL;
+		}
+
+		if (cntrl->arg >> 8 != ISDN_PROTO_L3_TRANS) {
+			dev_err(cs->dev,
+				"ISDN_CMD_SETL3: unsupported protocol (%lu)\n",
+				cntrl->arg >> 8);
+			return -EINVAL;
+		}
+
+		break;
+
+	default:
+		gig_dbg(DEBUG_CMD, "unknown command %d from LL",
+			cntrl->command);
+		return -EINVAL;
+	}
+
+	return retval;
+
+oom:
+	dev_err(bcs->cs->dev, "out of memory\n");
+	for (i = 0; i < AT_NUM; ++i)
+		kfree(commands[i]);
+	kfree(commands);
+	gigaset_free_channel(bcs);
+	return -ENOMEM;
+}
+
+static void gigaset_i4l_cmd(struct cardstate *cs, int cmd)
+{
+	isdn_if *iif = cs->iif;
+	isdn_ctrl command;
+
+	command.driver = cs->myid;
+	command.command = cmd;
+	command.arg = 0;
+	iif->statcallb(&command);
+}
+
+static void gigaset_i4l_channel_cmd(struct bc_state *bcs, int cmd)
+{
+	isdn_if *iif = bcs->cs->iif;
+	isdn_ctrl command;
+
+	command.driver = bcs->cs->myid;
+	command.command = cmd;
+	command.arg = bcs->channel;
+	iif->statcallb(&command);
+}
+
+/**
+ * gigaset_isdn_icall() - signal incoming call
+ * @at_state:	connection state structure.
+ *
+ * Called by main module to notify the LL that an incoming call has been
+ * received. @at_state contains the parameters of the call.
+ *
+ * Return value: call disposition (ICALL_*)
+ */
+int gigaset_isdn_icall(struct at_state_t *at_state)
+{
+	struct cardstate *cs = at_state->cs;
+	struct bc_state *bcs = at_state->bcs;
+	isdn_if *iif = cs->iif;
+	isdn_ctrl response;
+	int retval;
+
+	/* fill ICALL structure */
+	response.parm.setup.si1 = 0;	/* default: unknown */
+	response.parm.setup.si2 = 0;
+	response.parm.setup.screen = 0;
+	response.parm.setup.plan = 0;
+	if (!at_state->str_var[STR_ZBC]) {
+		/* no BC (internal call): assume speech, A-law */
+		response.parm.setup.si1 = 1;
+	} else if (!strcmp(at_state->str_var[STR_ZBC], "8890")) {
+		/* unrestricted digital information */
+		response.parm.setup.si1 = 7;
+	} else if (!strcmp(at_state->str_var[STR_ZBC], "8090A3")) {
+		/* speech, A-law */
+		response.parm.setup.si1 = 1;
+	} else if (!strcmp(at_state->str_var[STR_ZBC], "9090A3")) {
+		/* 3,1 kHz audio, A-law */
+		response.parm.setup.si1 = 1;
+		response.parm.setup.si2 = 2;
+	} else {
+		dev_warn(cs->dev, "RING ignored - unsupported BC %s\n",
+			 at_state->str_var[STR_ZBC]);
+		return ICALL_IGNORE;
+	}
+	if (at_state->str_var[STR_NMBR]) {
+		strlcpy(response.parm.setup.phone, at_state->str_var[STR_NMBR],
+			sizeof response.parm.setup.phone);
+	} else
+		response.parm.setup.phone[0] = 0;
+	if (at_state->str_var[STR_ZCPN]) {
+		strlcpy(response.parm.setup.eazmsn, at_state->str_var[STR_ZCPN],
+			sizeof response.parm.setup.eazmsn);
+	} else
+		response.parm.setup.eazmsn[0] = 0;
+
+	if (!bcs) {
+		dev_notice(cs->dev, "no channel for incoming call\n");
+		response.command = ISDN_STAT_ICALLW;
+		response.arg = 0;
+	} else {
+		gig_dbg(DEBUG_CMD, "Sending ICALL");
+		response.command = ISDN_STAT_ICALL;
+		response.arg = bcs->channel;
+	}
+	response.driver = cs->myid;
+	retval = iif->statcallb(&response);
+	gig_dbg(DEBUG_CMD, "Response: %d", retval);
+	switch (retval) {
+	case 0:	/* no takers */
+		return ICALL_IGNORE;
+	case 1:	/* alerting */
+		bcs->chstate |= CHS_NOTIFY_LL;
+		return ICALL_ACCEPT;
+	case 2:	/* reject */
+		return ICALL_REJECT;
+	case 3:	/* incomplete */
+		dev_warn(cs->dev,
+			 "LL requested unsupported feature: Incomplete Number\n");
+		return ICALL_IGNORE;
+	case 4:	/* proceeding */
+		/* Gigaset will send ALERTING anyway.
+		 * There doesn't seem to be a way to avoid this.
+		 */
+		return ICALL_ACCEPT;
+	case 5:	/* deflect */
+		dev_warn(cs->dev,
+			 "LL requested unsupported feature: Call Deflection\n");
+		return ICALL_IGNORE;
+	default:
+		dev_err(cs->dev, "LL error %d on ICALL\n", retval);
+		return ICALL_IGNORE;
+	}
+}
+
+/**
+ * gigaset_isdn_connD() - signal D channel connect
+ * @bcs:	B channel descriptor structure.
+ *
+ * Called by main module to notify the LL that the D channel connection has
+ * been established.
+ */
+void gigaset_isdn_connD(struct bc_state *bcs)
+{
+	gig_dbg(DEBUG_CMD, "sending DCONN");
+	gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DCONN);
+}
+
+/**
+ * gigaset_isdn_hupD() - signal D channel hangup
+ * @bcs:	B channel descriptor structure.
+ *
+ * Called by main module to notify the LL that the D channel connection has
+ * been shut down.
+ */
+void gigaset_isdn_hupD(struct bc_state *bcs)
+{
+	gig_dbg(DEBUG_CMD, "sending DHUP");
+	gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DHUP);
+}
+
+/**
+ * gigaset_isdn_connB() - signal B channel connect
+ * @bcs:	B channel descriptor structure.
+ *
+ * Called by main module to notify the LL that the B channel connection has
+ * been established.
+ */
+void gigaset_isdn_connB(struct bc_state *bcs)
+{
+	gig_dbg(DEBUG_CMD, "sending BCONN");
+	gigaset_i4l_channel_cmd(bcs, ISDN_STAT_BCONN);
+}
+
+/**
+ * gigaset_isdn_hupB() - signal B channel hangup
+ * @bcs:	B channel descriptor structure.
+ *
+ * Called by main module to notify the LL that the B channel connection has
+ * been shut down.
+ */
+void gigaset_isdn_hupB(struct bc_state *bcs)
+{
+	gig_dbg(DEBUG_CMD, "sending BHUP");
+	gigaset_i4l_channel_cmd(bcs, ISDN_STAT_BHUP);
+}
+
+/**
+ * gigaset_isdn_start() - signal device availability
+ * @cs:		device descriptor structure.
+ *
+ * Called by main module to notify the LL that the device is available for
+ * use.
+ */
+void gigaset_isdn_start(struct cardstate *cs)
+{
+	gig_dbg(DEBUG_CMD, "sending RUN");
+	gigaset_i4l_cmd(cs, ISDN_STAT_RUN);
+}
+
+/**
+ * gigaset_isdn_stop() - signal device unavailability
+ * @cs:		device descriptor structure.
+ *
+ * Called by main module to notify the LL that the device is no longer
+ * available for use.
+ */
+void gigaset_isdn_stop(struct cardstate *cs)
+{
+	gig_dbg(DEBUG_CMD, "sending STOP");
+	gigaset_i4l_cmd(cs, ISDN_STAT_STOP);
+}
+
+/**
+ * gigaset_isdn_regdev() - register to LL
+ * @cs:		device descriptor structure.
+ * @isdnid:	device name.
+ *
+ * Return value: 0 on success, error code < 0 on failure
+ */
+int gigaset_isdn_regdev(struct cardstate *cs, const char *isdnid)
+{
+	isdn_if *iif;
+
+	iif = kmalloc(sizeof *iif, GFP_KERNEL);
+	if (!iif) {
+		pr_err("out of memory\n");
+		return -ENOMEM;
+	}
+
+	if (snprintf(iif->id, sizeof iif->id, "%s_%u", isdnid, cs->minor_index)
+	    >= sizeof iif->id) {
+		pr_err("ID too long: %s\n", isdnid);
+		kfree(iif);
+		return -EINVAL;
+	}
+
+	iif->owner = THIS_MODULE;
+	iif->channels = cs->channels;
+	iif->maxbufsize = MAX_BUF_SIZE;
+	iif->features = ISDN_FEATURE_L2_TRANS |
+		ISDN_FEATURE_L2_HDLC |
+		ISDN_FEATURE_L2_X75I |
+		ISDN_FEATURE_L3_TRANS |
+		ISDN_FEATURE_P_EURO;
+	iif->hl_hdrlen = HW_HDR_LEN;		/* Area for storing ack */
+	iif->command = command_from_LL;
+	iif->writebuf_skb = writebuf_from_LL;
+	iif->writecmd = NULL;			/* Don't support isdnctrl */
+	iif->readstat = NULL;			/* Don't support isdnctrl */
+	iif->rcvcallb_skb = NULL;		/* Will be set by LL */
+	iif->statcallb = NULL;			/* Will be set by LL */
+
+	if (!register_isdn(iif)) {
+		pr_err("register_isdn failed\n");
+		kfree(iif);
+		return -EINVAL;
+	}
+
+	cs->iif = iif;
+	cs->myid = iif->channels;		/* Set my device id */
+	cs->hw_hdr_len = HW_HDR_LEN;
+	return 0;
+}
+
+/**
+ * gigaset_isdn_unregdev() - unregister device from LL
+ * @cs:		device descriptor structure.
+ */
+void gigaset_isdn_unregdev(struct cardstate *cs)
+{
+	gig_dbg(DEBUG_CMD, "sending UNLOAD");
+	gigaset_i4l_cmd(cs, ISDN_STAT_UNLOAD);
+	kfree(cs->iif);
+	cs->iif = NULL;
+}
+
+/**
+ * gigaset_isdn_regdrv() - register driver to LL
+ */
+void gigaset_isdn_regdrv(void)
+{
+	pr_info("ISDN4Linux interface\n");
+	/* nothing to do */
+}
+
+/**
+ * gigaset_isdn_unregdrv() - unregister driver from LL
+ */
+void gigaset_isdn_unregdrv(void)
+{
+	/* nothing to do */
+}

drivers/isdn/gigaset/interface.c

@@ -0,0 +1,605 @@
+/*
+ * interface to user space for the gigaset driver
+ *
+ * Copyright (c) 2004 by Hansjoerg Lipp <hjlipp@web.de>
+ *
+ * =====================================================================
+ *    This program is free software; you can redistribute it and/or
+ *    modify it under the terms of the GNU General Public License as
+ *    published by the Free Software Foundation; either version 2 of
+ *    the License, or (at your option) any later version.
+ * =====================================================================
+ */
+
+#include "gigaset.h"
+#include <linux/gigaset_dev.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+
+/*** our ioctls ***/
+
+static int if_lock(struct cardstate *cs, int *arg)
+{
+	int cmd = *arg;
+
+	gig_dbg(DEBUG_IF, "%u: if_lock (%d)", cs->minor_index, cmd);
+
+	if (cmd > 1)
+		return -EINVAL;
+
+	if (cmd < 0) {
+		*arg = cs->mstate == MS_LOCKED;
+		return 0;
+	}
+
+	if (!cmd && cs->mstate == MS_LOCKED && cs->connected) {
+		cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR | TIOCM_RTS);
+		cs->ops->baud_rate(cs, B115200);
+		cs->ops->set_line_ctrl(cs, CS8);
+		cs->control_state = TIOCM_DTR | TIOCM_RTS;
+	}
+
+	cs->waiting = 1;
+	if (!gigaset_add_event(cs, &cs->at_state, EV_IF_LOCK,
+			       NULL, cmd, NULL)) {
+		cs->waiting = 0;
+		return -ENOMEM;
+	}
+	gigaset_schedule_event(cs);
+
+	wait_event(cs->waitqueue, !cs->waiting);
+
+	if (cs->cmd_result >= 0) {
+		*arg = cs->cmd_result;
+		return 0;
+	}
+
+	return cs->cmd_result;
+}
+
+static int if_version(struct cardstate *cs, unsigned arg[4])
+{
+	static const unsigned version[4] = GIG_VERSION;
+	static const unsigned compat[4] = GIG_COMPAT;
+	unsigned cmd = arg[0];
+
+	gig_dbg(DEBUG_IF, "%u: if_version (%d)", cs->minor_index, cmd);
+
+	switch (cmd) {
+	case GIGVER_DRIVER:
+		memcpy(arg, version, sizeof version);
+		return 0;
+	case GIGVER_COMPAT:
+		memcpy(arg, compat, sizeof compat);
+		return 0;
+	case GIGVER_FWBASE:
+		cs->waiting = 1;
+		if (!gigaset_add_event(cs, &cs->at_state, EV_IF_VER,
+				       NULL, 0, arg)) {
+			cs->waiting = 0;
+			return -ENOMEM;
+		}
+		gigaset_schedule_event(cs);
+
+		wait_event(cs->waitqueue, !cs->waiting);
+
+		if (cs->cmd_result >= 0)
+			return 0;
+
+		return cs->cmd_result;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int if_config(struct cardstate *cs, int *arg)
+{
+	gig_dbg(DEBUG_IF, "%u: if_config (%d)", cs->minor_index, *arg);
+
+	if (*arg != 1)
+		return -EINVAL;
+
+	if (cs->mstate != MS_LOCKED)
+		return -EBUSY;
+
+	if (!cs->connected) {
+		pr_err("%s: not connected\n", __func__);
+		return -ENODEV;
+	}
+
+	*arg = 0;
+	return gigaset_enterconfigmode(cs);
+}
+
+/*** the terminal driver ***/
+
+static int if_open(struct tty_struct *tty, struct file *filp)
+{
+	struct cardstate *cs;
+
+	gig_dbg(DEBUG_IF, "%d+%d: %s()",
+		tty->driver->minor_start, tty->index, __func__);
+
+	cs = gigaset_get_cs_by_tty(tty);
+	if (!cs || !try_module_get(cs->driver->owner))
+		return -ENODEV;
+
+	if (mutex_lock_interruptible(&cs->mutex)) {
+		module_put(cs->driver->owner);
+		return -ERESTARTSYS;
+	}
+	tty->driver_data = cs;
+
+	++cs->port.count;
+
+	if (cs->port.count == 1) {
+		tty_port_tty_set(&cs->port, tty);
+		cs->port.low_latency = 1;
+	}
+
+	mutex_unlock(&cs->mutex);
+	return 0;
+}
+
+static void if_close(struct tty_struct *tty, struct file *filp)
+{
+	struct cardstate *cs = tty->driver_data;
+
+	if (!cs) { /* happens if we didn't find cs in open */
+		gig_dbg(DEBUG_IF, "%s: no cardstate", __func__);
+		return;
+	}
+
+	gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
+
+	mutex_lock(&cs->mutex);
+
+	if (!cs->connected)
+		gig_dbg(DEBUG_IF, "not connected");	/* nothing to do */
+	else if (!cs->port.count)
+		dev_warn(cs->dev, "%s: device not opened\n", __func__);
+	else if (!--cs->port.count)
+		tty_port_tty_set(&cs->port, NULL);
+
+	mutex_unlock(&cs->mutex);
+
+	module_put(cs->driver->owner);
+}
+
+static int if_ioctl(struct tty_struct *tty,
+		    unsigned int cmd, unsigned long arg)
+{
+	struct cardstate *cs = tty->driver_data;
+	int retval = -ENODEV;
+	int int_arg;
+	unsigned char buf[6];
+	unsigned version[4];
+
+	gig_dbg(DEBUG_IF, "%u: %s(0x%x)", cs->minor_index, __func__, cmd);
+
+	if (mutex_lock_interruptible(&cs->mutex))
+		return -ERESTARTSYS;
+
+	if (!cs->connected) {
+		gig_dbg(DEBUG_IF, "not connected");
+		retval = -ENODEV;
+	} else {
+		retval = 0;
+		switch (cmd) {
+		case GIGASET_REDIR:
+			retval = get_user(int_arg, (int __user *) arg);
+			if (retval >= 0)
+				retval = if_lock(cs, &int_arg);
+			if (retval >= 0)
+				retval = put_user(int_arg, (int __user *) arg);
+			break;
+		case GIGASET_CONFIG:
+			retval = get_user(int_arg, (int __user *) arg);
+			if (retval >= 0)
+				retval = if_config(cs, &int_arg);
+			if (retval >= 0)
+				retval = put_user(int_arg, (int __user *) arg);
+			break;
+		case GIGASET_BRKCHARS:
+			retval = copy_from_user(&buf,
+						(const unsigned char __user *) arg, 6)
+				? -EFAULT : 0;
+			if (retval >= 0) {
+				gigaset_dbg_buffer(DEBUG_IF, "GIGASET_BRKCHARS",
+						   6, (const unsigned char *) arg);
+				retval = cs->ops->brkchars(cs, buf);
+			}
+			break;
+		case GIGASET_VERSION:
+			retval = copy_from_user(version,
+						(unsigned __user *) arg, sizeof version)
+				? -EFAULT : 0;
+			if (retval >= 0)
+				retval = if_version(cs, version);
+			if (retval >= 0)
+				retval = copy_to_user((unsigned __user *) arg,
+						      version, sizeof version)
+					? -EFAULT : 0;
+			break;
+		default:
+			gig_dbg(DEBUG_IF, "%s: arg not supported - 0x%04x",
+				__func__, cmd);
+			retval = -ENOIOCTLCMD;
+		}
+	}
+
+	mutex_unlock(&cs->mutex);
+
+	return retval;
+}
+
+static int if_tiocmget(struct tty_struct *tty)
+{
+	struct cardstate *cs = tty->driver_data;
+	int retval;
+
+	gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
+
+	if (mutex_lock_interruptible(&cs->mutex))
+		return -ERESTARTSYS;
+
+	retval = cs->control_state & (TIOCM_RTS | TIOCM_DTR);
+
+	mutex_unlock(&cs->mutex);
+
+	return retval;
+}
+
+static int if_tiocmset(struct tty_struct *tty,
+		       unsigned int set, unsigned int clear)
+{
+	struct cardstate *cs = tty->driver_data;
+	int retval;
+	unsigned mc;
+
+	gig_dbg(DEBUG_IF, "%u: %s(0x%x, 0x%x)",
+		cs->minor_index, __func__, set, clear);
+
+	if (mutex_lock_interruptible(&cs->mutex))
+		return -ERESTARTSYS;
+
+	if (!cs->connected) {
+		gig_dbg(DEBUG_IF, "not connected");
+		retval = -ENODEV;
+	} else {
+		mc = (cs->control_state | set) & ~clear & (TIOCM_RTS | TIOCM_DTR);
+		retval = cs->ops->set_modem_ctrl(cs, cs->control_state, mc);
+		cs->control_state = mc;
+	}
+
+	mutex_unlock(&cs->mutex);
+
+	return retval;
+}
+
+static int if_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+	struct cardstate *cs = tty->driver_data;
+	struct cmdbuf_t *cb;
+	int retval;
+
+	gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
+
+	if (mutex_lock_interruptible(&cs->mutex))
+		return -ERESTARTSYS;
+
+	if (!cs->connected) {
+		gig_dbg(DEBUG_IF, "not connected");
+		retval = -ENODEV;
+		goto done;
+	}
+	if (cs->mstate != MS_LOCKED) {
+		dev_warn(cs->dev, "can't write to unlocked device\n");
+		retval = -EBUSY;
+		goto done;
+	}
+	if (count <= 0) {
+		/* nothing to do */
+		retval = 0;
+		goto done;
+	}
+
+	cb = kmalloc(sizeof(struct cmdbuf_t) + count, GFP_KERNEL);
+	if (!cb) {
+		dev_err(cs->dev, "%s: out of memory\n", __func__);
+		retval = -ENOMEM;
+		goto done;
+	}
+
+	memcpy(cb->buf, buf, count);
+	cb->len = count;
+	cb->offset = 0;
+	cb->next = NULL;
+	cb->wake_tasklet = &cs->if_wake_tasklet;
+	retval = cs->ops->write_cmd(cs, cb);
+done:
+	mutex_unlock(&cs->mutex);
+	return retval;
+}
+
+static int if_write_room(struct tty_struct *tty)
+{
+	struct cardstate *cs = tty->driver_data;
+	int retval;
+
+	gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
+
+	if (mutex_lock_interruptible(&cs->mutex))
+		return -ERESTARTSYS;
+
+	if (!cs->connected) {
+		gig_dbg(DEBUG_IF, "not connected");
+		retval = -ENODEV;
+	} else if (cs->mstate != MS_LOCKED) {
+		dev_warn(cs->dev, "can't write to unlocked device\n");
+		retval = -EBUSY;
+	} else
+		retval = cs->ops->write_room(cs);
+
+	mutex_unlock(&cs->mutex);
+
+	return retval;
+}
+
+static int if_chars_in_buffer(struct tty_struct *tty)
+{
+	struct cardstate *cs = tty->driver_data;
+	int retval = 0;
+
+	gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
+
+	mutex_lock(&cs->mutex);
+
+	if (!cs->connected)
+		gig_dbg(DEBUG_IF, "not connected");
+	else if (cs->mstate != MS_LOCKED)
+		dev_warn(cs->dev, "can't write to unlocked device\n");
+	else
+		retval = cs->ops->chars_in_buffer(cs);
+
+	mutex_unlock(&cs->mutex);
+
+	return retval;
+}
+
+static void if_throttle(struct tty_struct *tty)
+{
+	struct cardstate *cs = tty->driver_data;
+
+	gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
+
+	mutex_lock(&cs->mutex);
+
+	if (!cs->connected)
+		gig_dbg(DEBUG_IF, "not connected");	/* nothing to do */
+	else
+		gig_dbg(DEBUG_IF, "%s: not implemented\n", __func__);
+
+	mutex_unlock(&cs->mutex);
+}
+
+static void if_unthrottle(struct tty_struct *tty)
+{
+	struct cardstate *cs = tty->driver_data;
+
+	gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
+
+	mutex_lock(&cs->mutex);
+
+	if (!cs->connected)
+		gig_dbg(DEBUG_IF, "not connected");	/* nothing to do */
+	else
+		gig_dbg(DEBUG_IF, "%s: not implemented\n", __func__);
+
+	mutex_unlock(&cs->mutex);
+}
+
+static void if_set_termios(struct tty_struct *tty, struct ktermios *old)
+{
+	struct cardstate *cs = tty->driver_data;
+	unsigned int iflag;
+	unsigned int cflag;
+	unsigned int old_cflag;
+	unsigned int control_state, new_state;
+
+	gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
+
+	mutex_lock(&cs->mutex);
+
+	if (!cs->connected) {
+		gig_dbg(DEBUG_IF, "not connected");
+		goto out;
+	}
+
+	iflag = tty->termios.c_iflag;
+	cflag = tty->termios.c_cflag;
+	old_cflag = old ? old->c_cflag : cflag;
+	gig_dbg(DEBUG_IF, "%u: iflag %x cflag %x old %x",
+		cs->minor_index, iflag, cflag, old_cflag);
+
+	/* get a local copy of the current port settings */
+	control_state = cs->control_state;
+
+	/*
+	 * Update baud rate.
+	 * Do not attempt to cache old rates and skip settings,
+	 * disconnects screw such tricks up completely.
+	 * Premature optimization is the root of all evil.
+	 */
+
+	/* reassert DTR and (maybe) RTS on transition from B0 */
+	if ((old_cflag & CBAUD) == B0) {
+		new_state = control_state | TIOCM_DTR;
+		/* don't set RTS if using hardware flow control */
+		if (!(old_cflag & CRTSCTS))
+			new_state |= TIOCM_RTS;
+		gig_dbg(DEBUG_IF, "%u: from B0 - set DTR%s",
+			cs->minor_index,
+			(new_state & TIOCM_RTS) ? " only" : "/RTS");
+		cs->ops->set_modem_ctrl(cs, control_state, new_state);
+		control_state = new_state;
+	}
+
+	cs->ops->baud_rate(cs, cflag & CBAUD);
+
+	if ((cflag & CBAUD) == B0) {
+		/* Drop RTS and DTR */
+		gig_dbg(DEBUG_IF, "%u: to B0 - drop DTR/RTS", cs->minor_index);
+		new_state = control_state & ~(TIOCM_DTR | TIOCM_RTS);
+		cs->ops->set_modem_ctrl(cs, control_state, new_state);
+		control_state = new_state;
+	}
+
+	/*
+	 * Update line control register (LCR)
+	 */
+
+	cs->ops->set_line_ctrl(cs, cflag);
+
+	/* save off the modified port settings */
+	cs->control_state = control_state;
+
+out:
+	mutex_unlock(&cs->mutex);
+}
+
+static const struct tty_operations if_ops = {
+	.open =			if_open,
+	.close =		if_close,
+	.ioctl =		if_ioctl,
+	.write =		if_write,
+	.write_room =		if_write_room,
+	.chars_in_buffer =	if_chars_in_buffer,
+	.set_termios =		if_set_termios,
+	.throttle =		if_throttle,
+	.unthrottle =		if_unthrottle,
+	.tiocmget =		if_tiocmget,
+	.tiocmset =		if_tiocmset,
+};
+
+
+/* wakeup tasklet for the write operation */
+static void if_wake(unsigned long data)
+{
+	struct cardstate *cs = (struct cardstate *)data;
+
+	tty_port_tty_wakeup(&cs->port);
+}
+
+/*** interface to common ***/
+
+void gigaset_if_init(struct cardstate *cs)
+{
+	struct gigaset_driver *drv;
+
+	drv = cs->driver;
+	if (!drv->have_tty)
+		return;
+
+	tasklet_init(&cs->if_wake_tasklet, if_wake, (unsigned long) cs);
+
+	mutex_lock(&cs->mutex);
+	cs->tty_dev = tty_port_register_device(&cs->port, drv->tty,
+			cs->minor_index, NULL);
+
+	if (!IS_ERR(cs->tty_dev))
+		dev_set_drvdata(cs->tty_dev, cs);
+	else {
+		pr_warning("could not register device to the tty subsystem\n");
+		cs->tty_dev = NULL;
+	}
+	mutex_unlock(&cs->mutex);
+}
+
+void gigaset_if_free(struct cardstate *cs)
+{
+	struct gigaset_driver *drv;
+
+	drv = cs->driver;
+	if (!drv->have_tty)
+		return;
+
+	tasklet_disable(&cs->if_wake_tasklet);
+	tasklet_kill(&cs->if_wake_tasklet);
+	cs->tty_dev = NULL;
+	tty_unregister_device(drv->tty, cs->minor_index);
+}
+
+/**
+ * gigaset_if_receive() - pass a received block of data to the tty device
+ * @cs:		device descriptor structure.
+ * @buffer:	received data.
+ * @len:	number of bytes received.
+ *
+ * Called by asyncdata/isocdata if a block of data received from the
+ * device must be sent to userspace through the ttyG* device.
+ */
+void gigaset_if_receive(struct cardstate *cs,
+			unsigned char *buffer, size_t len)
+{
+	tty_insert_flip_string(&cs->port, buffer, len);
+	tty_flip_buffer_push(&cs->port);
+}
+EXPORT_SYMBOL_GPL(gigaset_if_receive);
+
+/* gigaset_if_initdriver
+ * Initialize tty interface.
+ * parameters:
+ *	drv		Driver
+ *	procname	Name of the driver (e.g. for /proc/tty/drivers)
+ *	devname		Name of the device files (prefix without minor number)
+ */
+void gigaset_if_initdriver(struct gigaset_driver *drv, const char *procname,
+			   const char *devname)
+{
+	int ret;
+	struct tty_driver *tty;
+
+	drv->have_tty = 0;
+
+	drv->tty = tty = alloc_tty_driver(drv->minors);
+	if (tty == NULL)
+		goto enomem;
+
+	tty->type =		TTY_DRIVER_TYPE_SERIAL;
+	tty->subtype =		SERIAL_TYPE_NORMAL;
+	tty->flags =		TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+
+	tty->driver_name =	procname;
+	tty->name =		devname;
+	tty->minor_start =	drv->minor;
+
+	tty->init_termios          = tty_std_termios;
+	tty->init_termios.c_cflag  = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+	tty_set_operations(tty, &if_ops);
+
+	ret = tty_register_driver(tty);
+	if (ret < 0) {
+		pr_err("error %d registering tty driver\n", ret);
+		goto error;
+	}
+	gig_dbg(DEBUG_IF, "tty driver initialized");
+	drv->have_tty = 1;
+	return;
+
+enomem:
+	pr_err("out of memory\n");
+error:
+	if (drv->tty)
+		put_tty_driver(drv->tty);
+}
+
+void gigaset_if_freedriver(struct gigaset_driver *drv)
+{
+	if (!drv->have_tty)
+		return;
+
+	drv->have_tty = 0;
+	tty_unregister_driver(drv->tty);
+	put_tty_driver(drv->tty);
+}

drivers/isdn/gigaset/proc.c

@@ -0,0 +1,80 @@
+/*
+ * Stuff used by all variants of the driver
+ *
+ * Copyright (c) 2001 by Stefan Eilers,
+ *                       Hansjoerg Lipp <hjlipp@web.de>,
+ *                       Tilman Schmidt <tilman@imap.cc>.
+ *
+ * =====================================================================
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License as
+ *	published by the Free Software Foundation; either version 2 of
+ *	the License, or (at your option) any later version.
+ * =====================================================================
+ */
+
+#include "gigaset.h"
+
+static ssize_t show_cidmode(struct device *dev,
+			    struct device_attribute *attr, char *buf)
+{
+	struct cardstate *cs = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", cs->cidmode);
+}
+
+static ssize_t set_cidmode(struct device *dev, struct device_attribute *attr,
+			   const char *buf, size_t count)
+{
+	struct cardstate *cs = dev_get_drvdata(dev);
+	long int value;
+	char *end;
+
+	value = simple_strtol(buf, &end, 0);
+	while (*end)
+		if (!isspace(*end++))
+			return -EINVAL;
+	if (value < 0 || value > 1)
+		return -EINVAL;
+
+	if (mutex_lock_interruptible(&cs->mutex))
+		return -ERESTARTSYS;
+
+	cs->waiting = 1;
+	if (!gigaset_add_event(cs, &cs->at_state, EV_PROC_CIDMODE,
+			       NULL, value, NULL)) {
+		cs->waiting = 0;
+		mutex_unlock(&cs->mutex);
+		return -ENOMEM;
+	}
+	gigaset_schedule_event(cs);
+
+	wait_event(cs->waitqueue, !cs->waiting);
+
+	mutex_unlock(&cs->mutex);
+
+	return count;
+}
+
+static DEVICE_ATTR(cidmode, S_IRUGO | S_IWUSR, show_cidmode, set_cidmode);
+
+/* free sysfs for device */
+void gigaset_free_dev_sysfs(struct cardstate *cs)
+{
+	if (!cs->tty_dev)
+		return;
+
+	gig_dbg(DEBUG_INIT, "removing sysfs entries");
+	device_remove_file(cs->tty_dev, &dev_attr_cidmode);
+}
+
+/* initialize sysfs for device */
+void gigaset_init_dev_sysfs(struct cardstate *cs)
+{
+	if (!cs->tty_dev)
+		return;
+
+	gig_dbg(DEBUG_INIT, "setting up sysfs");
+	if (device_create_file(cs->tty_dev, &dev_attr_cidmode))
+		pr_err("could not create sysfs attribute\n");
+}

drivers/isdn/gigaset/ser-gigaset.c

@@ -0,0 +1,820 @@
+/* This is the serial hardware link layer (HLL) for the Gigaset 307x isdn
+ * DECT base (aka Sinus 45 isdn) using the RS232 DECT data module M101,
+ * written as a line discipline.
+ *
+ * =====================================================================
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ * =====================================================================
+ */
+
+#include "gigaset.h"
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/completion.h>
+
+/* Version Information */
+#define DRIVER_AUTHOR "Tilman Schmidt"
+#define DRIVER_DESC "Serial Driver for Gigaset 307x using Siemens M101"
+
+#define GIGASET_MINORS     1
+#define GIGASET_MINOR      0
+#define GIGASET_MODULENAME "ser_gigaset"
+#define GIGASET_DEVNAME    "ttyGS"
+
+/* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
+#define IF_WRITEBUF 264
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_LDISC(N_GIGASET_M101);
+
+static int startmode = SM_ISDN;
+module_param(startmode, int, S_IRUGO);
+MODULE_PARM_DESC(startmode, "initial operation mode");
+static int cidmode = 1;
+module_param(cidmode, int, S_IRUGO);
+MODULE_PARM_DESC(cidmode, "stay in CID mode when idle");
+
+static struct gigaset_driver *driver;
+
+struct ser_cardstate {
+	struct platform_device	dev;
+	struct tty_struct	*tty;
+	atomic_t		refcnt;
+	struct completion	dead_cmp;
+};
+
+static struct platform_driver device_driver = {
+	.driver = {
+		.name = GIGASET_MODULENAME,
+	},
+};
+
+static void flush_send_queue(struct cardstate *);
+
+/* transmit data from current open skb
+ * result: number of bytes sent or error code < 0
+ */
+static int write_modem(struct cardstate *cs)
+{
+	struct tty_struct *tty = cs->hw.ser->tty;
+	struct bc_state *bcs = &cs->bcs[0];	/* only one channel */
+	struct sk_buff *skb = bcs->tx_skb;
+	int sent = -EOPNOTSUPP;
+
+	if (!tty || !tty->driver || !skb)
+		return -EINVAL;
+
+	if (!skb->len) {
+		dev_kfree_skb_any(skb);
+		bcs->tx_skb = NULL;
+		return -EINVAL;
+	}
+
+	set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+	if (tty->ops->write)
+		sent = tty->ops->write(tty, skb->data, skb->len);
+	gig_dbg(DEBUG_OUTPUT, "write_modem: sent %d", sent);
+	if (sent < 0) {
+		/* error */
+		flush_send_queue(cs);
+		return sent;
+	}
+	skb_pull(skb, sent);
+	if (!skb->len) {
+		/* skb sent completely */
+		gigaset_skb_sent(bcs, skb);
+
+		gig_dbg(DEBUG_INTR, "kfree skb (Adr: %lx)!",
+			(unsigned long) skb);
+		dev_kfree_skb_any(skb);
+		bcs->tx_skb = NULL;
+	}
+	return sent;
+}
+
+/*
+ * transmit first queued command buffer
+ * result: number of bytes sent or error code < 0
+ */
+static int send_cb(struct cardstate *cs)
+{
+	struct tty_struct *tty = cs->hw.ser->tty;
+	struct cmdbuf_t *cb, *tcb;
+	unsigned long flags;
+	int sent = 0;
+
+	if (!tty || !tty->driver)
+		return -EFAULT;
+
+	cb = cs->cmdbuf;
+	if (!cb)
+		return 0;	/* nothing to do */
+
+	if (cb->len) {
+		set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+		sent = tty->ops->write(tty, cb->buf + cb->offset, cb->len);
+		if (sent < 0) {
+			/* error */
+			gig_dbg(DEBUG_OUTPUT, "send_cb: write error %d", sent);
+			flush_send_queue(cs);
+			return sent;
+		}
+		cb->offset += sent;
+		cb->len -= sent;
+		gig_dbg(DEBUG_OUTPUT, "send_cb: sent %d, left %u, queued %u",
+			sent, cb->len, cs->cmdbytes);
+	}
+
+	while (cb && !cb->len) {
+		spin_lock_irqsave(&cs->cmdlock, flags);
+		cs->cmdbytes -= cs->curlen;
+		tcb = cb;
+		cs->cmdbuf = cb = cb->next;
+		if (cb) {
+			cb->prev = NULL;
+			cs->curlen = cb->len;
+		} else {
+			cs->lastcmdbuf = NULL;
+			cs->curlen = 0;
+		}
+		spin_unlock_irqrestore(&cs->cmdlock, flags);
+
+		if (tcb->wake_tasklet)
+			tasklet_schedule(tcb->wake_tasklet);
+		kfree(tcb);
+	}
+	return sent;
+}
+
+/*
+ * send queue tasklet
+ * If there is already a skb opened, put data to the transfer buffer
+ * by calling "write_modem".
+ * Otherwise take a new skb out of the queue.
+ */
+static void gigaset_modem_fill(unsigned long data)
+{
+	struct cardstate *cs = (struct cardstate *) data;
+	struct bc_state *bcs;
+	struct sk_buff *nextskb;
+	int sent = 0;
+
+	if (!cs) {
+		gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__);
+		return;
+	}
+	bcs = cs->bcs;
+	if (!bcs) {
+		gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__);
+		return;
+	}
+	if (!bcs->tx_skb) {
+		/* no skb is being sent; send command if any */
+		sent = send_cb(cs);
+		gig_dbg(DEBUG_OUTPUT, "%s: send_cb -> %d", __func__, sent);
+		if (sent)
+			/* something sent or error */
+			return;
+
+		/* no command to send; get skb */
+		nextskb = skb_dequeue(&bcs->squeue);
+		if (!nextskb)
+			/* no skb either, nothing to do */
+			return;
+		bcs->tx_skb = nextskb;
+
+		gig_dbg(DEBUG_INTR, "Dequeued skb (Adr: %lx)",
+			(unsigned long) bcs->tx_skb);
+	}
+
+	/* send skb */
+	gig_dbg(DEBUG_OUTPUT, "%s: tx_skb", __func__);
+	if (write_modem(cs) < 0)
+		gig_dbg(DEBUG_OUTPUT, "%s: write_modem failed", __func__);
+}
+
+/*
+ * throw away all data queued for sending
+ */
+static void flush_send_queue(struct cardstate *cs)
+{
+	struct sk_buff *skb;
+	struct cmdbuf_t *cb;
+	unsigned long flags;
+
+	/* command queue */
+	spin_lock_irqsave(&cs->cmdlock, flags);
+	while ((cb = cs->cmdbuf) != NULL) {
+		cs->cmdbuf = cb->next;
+		if (cb->wake_tasklet)
+			tasklet_schedule(cb->wake_tasklet);
+		kfree(cb);
+	}
+	cs->cmdbuf = cs->lastcmdbuf = NULL;
+	cs->cmdbytes = cs->curlen = 0;
+	spin_unlock_irqrestore(&cs->cmdlock, flags);
+
+	/* data queue */
+	if (cs->bcs->tx_skb)
+		dev_kfree_skb_any(cs->bcs->tx_skb);
+	while ((skb = skb_dequeue(&cs->bcs->squeue)) != NULL)
+		dev_kfree_skb_any(skb);
+}
+
+
+/* Gigaset Driver Interface */
+/* ======================== */
+
+/*
+ * queue an AT command string for transmission to the Gigaset device
+ * parameters:
+ *	cs		controller state structure
+ *	buf		buffer containing the string to send
+ *	len		number of characters to send
+ *	wake_tasklet	tasklet to run when transmission is complete, or NULL
+ * return value:
+ *	number of bytes queued, or error code < 0
+ */
+static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb)
+{
+	unsigned long flags;
+
+	gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
+			   DEBUG_TRANSCMD : DEBUG_LOCKCMD,
+			   "CMD Transmit", cb->len, cb->buf);
+
+	spin_lock_irqsave(&cs->cmdlock, flags);
+	cb->prev = cs->lastcmdbuf;
+	if (cs->lastcmdbuf)
+		cs->lastcmdbuf->next = cb;
+	else {
+		cs->cmdbuf = cb;
+		cs->curlen = cb->len;
+	}
+	cs->cmdbytes += cb->len;
+	cs->lastcmdbuf = cb;
+	spin_unlock_irqrestore(&cs->cmdlock, flags);
+
+	spin_lock_irqsave(&cs->lock, flags);
+	if (cs->connected)
+		tasklet_schedule(&cs->write_tasklet);
+	spin_unlock_irqrestore(&cs->lock, flags);
+	return cb->len;
+}
+
+/*
+ * tty_driver.write_room interface routine
+ * return number of characters the driver will accept to be written
+ * parameter:
+ *	controller state structure
+ * return value:
+ *	number of characters
+ */
+static int gigaset_write_room(struct cardstate *cs)
+{
+	unsigned bytes;
+
+	bytes = cs->cmdbytes;
+	return bytes < IF_WRITEBUF ? IF_WRITEBUF - bytes : 0;
+}
+
+/*
+ * tty_driver.chars_in_buffer interface routine
+ * return number of characters waiting to be sent
+ * parameter:
+ *	controller state structure
+ * return value:
+ *	number of characters
+ */
+static int gigaset_chars_in_buffer(struct cardstate *cs)
+{
+	return cs->cmdbytes;
+}
+
+/*
+ * implementation of ioctl(GIGASET_BRKCHARS)
+ * parameter:
+ *	controller state structure
+ * return value:
+ *	-EINVAL (unimplemented function)
+ */
+static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
+{
+	/* not implemented */
+	return -EINVAL;
+}
+
+/*
+ * Open B channel
+ * Called by "do_action" in ev-layer.c
+ */
+static int gigaset_init_bchannel(struct bc_state *bcs)
+{
+	/* nothing to do for M10x */
+	gigaset_bchannel_up(bcs);
+	return 0;
+}
+
+/*
+ * Close B channel
+ * Called by "do_action" in ev-layer.c
+ */
+static int gigaset_close_bchannel(struct bc_state *bcs)
+{
+	/* nothing to do for M10x */
+	gigaset_bchannel_down(bcs);
+	return 0;
+}
+
+/*
+ * Set up B channel structure
+ * This is called by "gigaset_initcs" in common.c
+ */
+static int gigaset_initbcshw(struct bc_state *bcs)
+{
+	/* unused */
+	bcs->hw.ser = NULL;
+	return 0;
+}
+
+/*
+ * Free B channel structure
+ * Called by "gigaset_freebcs" in common.c
+ */
+static void gigaset_freebcshw(struct bc_state *bcs)
+{
+	/* unused */
+}
+
+/*
+ * Reinitialize B channel structure
+ * This is called by "bcs_reinit" in common.c
+ */
+static void gigaset_reinitbcshw(struct bc_state *bcs)
+{
+	/* nothing to do for M10x */
+}
+
+/*
+ * Free hardware specific device data
+ * This will be called by "gigaset_freecs" in common.c
+ */
+static void gigaset_freecshw(struct cardstate *cs)
+{
+	tasklet_kill(&cs->write_tasklet);
+	if (!cs->hw.ser)
+		return;
+	dev_set_drvdata(&cs->hw.ser->dev.dev, NULL);
+	platform_device_unregister(&cs->hw.ser->dev);
+	kfree(cs->hw.ser);
+	cs->hw.ser = NULL;
+}
+
+static void gigaset_device_release(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+
+	/* adapted from platform_device_release() in drivers/base/platform.c */
+	kfree(dev->platform_data);
+	kfree(pdev->resource);
+}
+
+/*
+ * Set up hardware specific device data
+ * This is called by "gigaset_initcs" in common.c
+ */
+static int gigaset_initcshw(struct cardstate *cs)
+{
+	int rc;
+	struct ser_cardstate *scs;
+
+	scs = kzalloc(sizeof(struct ser_cardstate), GFP_KERNEL);
+	if (!scs) {
+		pr_err("out of memory\n");
+		return -ENOMEM;
+	}
+	cs->hw.ser = scs;
+
+	cs->hw.ser->dev.name = GIGASET_MODULENAME;
+	cs->hw.ser->dev.id = cs->minor_index;
+	cs->hw.ser->dev.dev.release = gigaset_device_release;
+	rc = platform_device_register(&cs->hw.ser->dev);
+	if (rc != 0) {
+		pr_err("error %d registering platform device\n", rc);
+		kfree(cs->hw.ser);
+		cs->hw.ser = NULL;
+		return rc;
+	}
+	dev_set_drvdata(&cs->hw.ser->dev.dev, cs);
+
+	tasklet_init(&cs->write_tasklet,
+		     gigaset_modem_fill, (unsigned long) cs);
+	return 0;
+}
+
+/*
+ * set modem control lines
+ * Parameters:
+ *	card state structure
+ *	modem control line state ([TIOCM_DTR]|[TIOCM_RTS])
+ * Called by "gigaset_start" and "gigaset_enterconfigmode" in common.c
+ * and by "if_lock" and "if_termios" in interface.c
+ */
+static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
+				  unsigned new_state)
+{
+	struct tty_struct *tty = cs->hw.ser->tty;
+	unsigned int set, clear;
+
+	if (!tty || !tty->driver || !tty->ops->tiocmset)
+		return -EINVAL;
+	set = new_state & ~old_state;
+	clear = old_state & ~new_state;
+	if (!set && !clear)
+		return 0;
+	gig_dbg(DEBUG_IF, "tiocmset set %x clear %x", set, clear);
+	return tty->ops->tiocmset(tty, set, clear);
+}
+
+static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
+{
+	return -EINVAL;
+}
+
+static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
+{
+	return -EINVAL;
+}
+
+static const struct gigaset_ops ops = {
+	gigaset_write_cmd,
+	gigaset_write_room,
+	gigaset_chars_in_buffer,
+	gigaset_brkchars,
+	gigaset_init_bchannel,
+	gigaset_close_bchannel,
+	gigaset_initbcshw,
+	gigaset_freebcshw,
+	gigaset_reinitbcshw,
+	gigaset_initcshw,
+	gigaset_freecshw,
+	gigaset_set_modem_ctrl,
+	gigaset_baud_rate,
+	gigaset_set_line_ctrl,
+	gigaset_m10x_send_skb,	/* asyncdata.c */
+	gigaset_m10x_input,	/* asyncdata.c */
+};
+
+
+/* Line Discipline Interface */
+/* ========================= */
+
+/* helper functions for cardstate refcounting */
+static struct cardstate *cs_get(struct tty_struct *tty)
+{
+	struct cardstate *cs = tty->disc_data;
+
+	if (!cs || !cs->hw.ser) {
+		gig_dbg(DEBUG_ANY, "%s: no cardstate", __func__);
+		return NULL;
+	}
+	atomic_inc(&cs->hw.ser->refcnt);
+	return cs;
+}
+
+static void cs_put(struct cardstate *cs)
+{
+	if (atomic_dec_and_test(&cs->hw.ser->refcnt))
+		complete(&cs->hw.ser->dead_cmp);
+}
+
+/*
+ * Called by the tty driver when the line discipline is pushed onto the tty.
+ * Called in process context.
+ */
+static int
+gigaset_tty_open(struct tty_struct *tty)
+{
+	struct cardstate *cs;
+	int rc;
+
+	gig_dbg(DEBUG_INIT, "Starting HLL for Gigaset M101");
+
+	pr_info(DRIVER_DESC "\n");
+
+	if (!driver) {
+		pr_err("%s: no driver structure\n", __func__);
+		return -ENODEV;
+	}
+
+	/* allocate memory for our device state and initialize it */
+	cs = gigaset_initcs(driver, 1, 1, 0, cidmode, GIGASET_MODULENAME);
+	if (!cs) {
+		rc = -ENODEV;
+		goto error;
+	}
+
+	cs->dev = &cs->hw.ser->dev.dev;
+	cs->hw.ser->tty = tty;
+	atomic_set(&cs->hw.ser->refcnt, 1);
+	init_completion(&cs->hw.ser->dead_cmp);
+
+	tty->disc_data = cs;
+
+	/* OK.. Initialization of the datastructures and the HW is done.. Now
+	 * startup system and notify the LL that we are ready to run
+	 */
+	if (startmode == SM_LOCKED)
+		cs->mstate = MS_LOCKED;
+	rc = gigaset_start(cs);
+	if (rc < 0) {
+		tasklet_kill(&cs->write_tasklet);
+		goto error;
+	}
+
+	gig_dbg(DEBUG_INIT, "Startup of HLL done");
+	return 0;
+
+error:
+	gig_dbg(DEBUG_INIT, "Startup of HLL failed");
+	tty->disc_data = NULL;
+	gigaset_freecs(cs);
+	return rc;
+}
+
+/*
+ * Called by the tty driver when the line discipline is removed.
+ * Called from process context.
+ */
+static void
+gigaset_tty_close(struct tty_struct *tty)
+{
+	struct cardstate *cs = tty->disc_data;
+
+	gig_dbg(DEBUG_INIT, "Stopping HLL for Gigaset M101");
+
+	if (!cs) {
+		gig_dbg(DEBUG_INIT, "%s: no cardstate", __func__);
+		return;
+	}
+
+	/* prevent other callers from entering ldisc methods */
+	tty->disc_data = NULL;
+
+	if (!cs->hw.ser)
+		pr_err("%s: no hw cardstate\n", __func__);
+	else {
+		/* wait for running methods to finish */
+		if (!atomic_dec_and_test(&cs->hw.ser->refcnt))
+			wait_for_completion(&cs->hw.ser->dead_cmp);
+	}
+
+	/* stop operations */
+	gigaset_stop(cs);
+	tasklet_kill(&cs->write_tasklet);
+	flush_send_queue(cs);
+	cs->dev = NULL;
+	gigaset_freecs(cs);
+
+	gig_dbg(DEBUG_INIT, "Shutdown of HLL done");
+}
+
+/*
+ * Called by the tty driver when the tty line is hung up.
+ * Wait for I/O to driver to complete and unregister ISDN device.
+ * This is already done by the close routine, so just call that.
+ * Called from process context.
+ */
+static int gigaset_tty_hangup(struct tty_struct *tty)
+{
+	gigaset_tty_close(tty);
+	return 0;
+}
+
+/*
+ * Read on the tty.
+ * Unused, received data goes only to the Gigaset driver.
+ */
+static ssize_t
+gigaset_tty_read(struct tty_struct *tty, struct file *file,
+		 unsigned char __user *buf, size_t count)
+{
+	return -EAGAIN;
+}
+
+/*
+ * Write on the tty.
+ * Unused, transmit data comes only from the Gigaset driver.
+ */
+static ssize_t
+gigaset_tty_write(struct tty_struct *tty, struct file *file,
+		  const unsigned char *buf, size_t count)
+{
+	return -EAGAIN;
+}
+
+/*
+ * Ioctl on the tty.
+ * Called in process context only.
+ * May be re-entered by multiple ioctl calling threads.
+ */
+static int
+gigaset_tty_ioctl(struct tty_struct *tty, struct file *file,
+		  unsigned int cmd, unsigned long arg)
+{
+	struct cardstate *cs = cs_get(tty);
+	int rc, val;
+	int __user *p = (int __user *)arg;
+
+	if (!cs)
+		return -ENXIO;
+
+	switch (cmd) {
+
+	case FIONREAD:
+		/* unused, always return zero */
+		val = 0;
+		rc = put_user(val, p);
+		break;
+
+	case TCFLSH:
+		/* flush our buffers and the serial port's buffer */
+		switch (arg) {
+		case TCIFLUSH:
+			/* no own input buffer to flush */
+			break;
+		case TCIOFLUSH:
+		case TCOFLUSH:
+			flush_send_queue(cs);
+			break;
+		}
+		/* Pass through */
+
+	default:
+		/* pass through to underlying serial device */
+		rc = n_tty_ioctl_helper(tty, file, cmd, arg);
+		break;
+	}
+	cs_put(cs);
+	return rc;
+}
+
+/*
+ * Called by the tty driver when a block of data has been received.
+ * Will not be re-entered while running but other ldisc functions
+ * may be called in parallel.
+ * Can be called from hard interrupt level as well as soft interrupt
+ * level or mainline.
+ * Parameters:
+ *	tty	tty structure
+ *	buf	buffer containing received characters
+ *	cflags	buffer containing error flags for received characters (ignored)
+ *	count	number of received characters
+ */
+static void
+gigaset_tty_receive(struct tty_struct *tty, const unsigned char *buf,
+		    char *cflags, int count)
+{
+	struct cardstate *cs = cs_get(tty);
+	unsigned tail, head, n;
+	struct inbuf_t *inbuf;
+
+	if (!cs)
+		return;
+	inbuf = cs->inbuf;
+	if (!inbuf) {
+		dev_err(cs->dev, "%s: no inbuf\n", __func__);
+		cs_put(cs);
+		return;
+	}
+
+	tail = inbuf->tail;
+	head = inbuf->head;
+	gig_dbg(DEBUG_INTR, "buffer state: %u -> %u, receive %u bytes",
+		head, tail, count);
+
+	if (head <= tail) {
+		/* possible buffer wraparound */
+		n = min_t(unsigned, count, RBUFSIZE - tail);
+		memcpy(inbuf->data + tail, buf, n);
+		tail = (tail + n) % RBUFSIZE;
+		buf += n;
+		count -= n;
+	}
+
+	if (count > 0) {
+		/* tail < head and some data left */
+		n = head - tail - 1;
+		if (count > n) {
+			dev_err(cs->dev,
+				"inbuf overflow, discarding %d bytes\n",
+				count - n);
+			count = n;
+		}
+		memcpy(inbuf->data + tail, buf, count);
+		tail += count;
+	}
+
+	gig_dbg(DEBUG_INTR, "setting tail to %u", tail);
+	inbuf->tail = tail;
+
+	/* Everything was received .. Push data into handler */
+	gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
+	gigaset_schedule_event(cs);
+	cs_put(cs);
+}
+
+/*
+ * Called by the tty driver when there's room for more data to send.
+ */
+static void
+gigaset_tty_wakeup(struct tty_struct *tty)
+{
+	struct cardstate *cs = cs_get(tty);
+
+	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+	if (!cs)
+		return;
+	tasklet_schedule(&cs->write_tasklet);
+	cs_put(cs);
+}
+
+static struct tty_ldisc_ops gigaset_ldisc = {
+	.owner		= THIS_MODULE,
+	.magic		= TTY_LDISC_MAGIC,
+	.name		= "ser_gigaset",
+	.open		= gigaset_tty_open,
+	.close		= gigaset_tty_close,
+	.hangup		= gigaset_tty_hangup,
+	.read		= gigaset_tty_read,
+	.write		= gigaset_tty_write,
+	.ioctl		= gigaset_tty_ioctl,
+	.receive_buf	= gigaset_tty_receive,
+	.write_wakeup	= gigaset_tty_wakeup,
+};
+
+
+/* Initialization / Shutdown */
+/* ========================= */
+
+static int __init ser_gigaset_init(void)
+{
+	int rc;
+
+	gig_dbg(DEBUG_INIT, "%s", __func__);
+	rc = platform_driver_register(&device_driver);
+	if (rc != 0) {
+		pr_err("error %d registering platform driver\n", rc);
+		return rc;
+	}
+
+	/* allocate memory for our driver state and initialize it */
+	driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
+				    GIGASET_MODULENAME, GIGASET_DEVNAME,
+				    &ops, THIS_MODULE);
+	if (!driver)
+		goto error;
+
+	rc = tty_register_ldisc(N_GIGASET_M101, &gigaset_ldisc);
+	if (rc != 0) {
+		pr_err("error %d registering line discipline\n", rc);
+		goto error;
+	}
+
+	return 0;
+
+error:
+	if (driver) {
+		gigaset_freedriver(driver);
+		driver = NULL;
+	}
+	platform_driver_unregister(&device_driver);
+	return rc;
+}
+
+static void __exit ser_gigaset_exit(void)
+{
+	int rc;
+
+	gig_dbg(DEBUG_INIT, "%s", __func__);
+
+	if (driver) {
+		gigaset_freedriver(driver);
+		driver = NULL;
+	}
+
+	rc = tty_unregister_ldisc(N_GIGASET_M101);
+	if (rc != 0)
+		pr_err("error %d unregistering line discipline\n", rc);
+
+	platform_driver_unregister(&device_driver);
+}
+
+module_init(ser_gigaset_init);
+module_exit(ser_gigaset_exit);

drivers/isdn/gigaset/usb-gigaset.c

@@ -0,0 +1,954 @@
+/*
+ * USB driver for Gigaset 307x directly or using M105 Data.
+ *
+ * Copyright (c) 2001 by Stefan Eilers
+ *                   and Hansjoerg Lipp <hjlipp@web.de>.
+ *
+ * This driver was derived from the USB skeleton driver by
+ * Greg Kroah-Hartman <greg@kroah.com>
+ *
+ * =====================================================================
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License as
+ *	published by the Free Software Foundation; either version 2 of
+ *	the License, or (at your option) any later version.
+ * =====================================================================
+ */
+
+#include "gigaset.h"
+#include <linux/usb.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+
+/* Version Information */
+#define DRIVER_AUTHOR "Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
+#define DRIVER_DESC "USB Driver for Gigaset 307x using M105"
+
+/* Module parameters */
+
+static int startmode = SM_ISDN;
+static int cidmode = 1;
+
+module_param(startmode, int, S_IRUGO);
+module_param(cidmode, int, S_IRUGO);
+MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
+MODULE_PARM_DESC(cidmode, "Call-ID mode");
+
+#define GIGASET_MINORS     1
+#define GIGASET_MINOR      8
+#define GIGASET_MODULENAME "usb_gigaset"
+#define GIGASET_DEVNAME    "ttyGU"
+
+/* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
+#define IF_WRITEBUF 264
+
+/* Values for the Gigaset M105 Data */
+#define USB_M105_VENDOR_ID	0x0681
+#define USB_M105_PRODUCT_ID	0x0009
+
+/* table of devices that work with this driver */
+static const struct usb_device_id gigaset_table[] = {
+	{ USB_DEVICE(USB_M105_VENDOR_ID, USB_M105_PRODUCT_ID) },
+	{ }					/* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, gigaset_table);
+
+/*
+ * Control requests (empty fields: 00)
+ *
+ *       RT|RQ|VALUE|INDEX|LEN  |DATA
+ * In:
+ *       C1 08             01
+ *            Get flags (1 byte). Bits: 0=dtr,1=rts,3-7:?
+ *       C1 0F             ll ll
+ *            Get device information/status (llll: 0x200 and 0x40 seen).
+ *            Real size: I only saw MIN(llll,0x64).
+ *            Contents: seems to be always the same...
+ *              offset 0x00: Length of this structure (0x64) (len: 1,2,3 bytes)
+ *              offset 0x3c: String (16 bit chars): "MCCI USB Serial V2.0"
+ *              rest:        ?
+ * Out:
+ *       41 11
+ *            Initialize/reset device ?
+ *       41 00 xx 00
+ *            ? (xx=00 or 01; 01 on start, 00 on close)
+ *       41 07 vv mm
+ *            Set/clear flags vv=value, mm=mask (see RQ 08)
+ *       41 12 xx
+ *            Used before the following configuration requests are issued
+ *            (with xx=0x0f). I've seen other values<0xf, though.
+ *       41 01 xx xx
+ *            Set baud rate. xxxx=ceil(0x384000/rate)=trunc(0x383fff/rate)+1.
+ *       41 03 ps bb
+ *            Set byte size and parity. p:  0x20=even,0x10=odd,0x00=no parity
+ *                                     [    0x30: m, 0x40: s           ]
+ *                                     [s:  0: 1 stop bit; 1: 1.5; 2: 2]
+ *                                      bb: bits/byte (seen 7 and 8)
+ *       41 13 -- -- -- -- 10 00 ww 00 00 00 xx 00 00 00 yy 00 00 00 zz 00 00 00
+ *            ??
+ *            Initialization: 01, 40, 00, 00
+ *            Open device:    00  40, 00, 00
+ *            yy and zz seem to be equal, either 0x00 or 0x0a
+ *            (ww,xx) pairs seen: (00,00), (00,40), (01,40), (09,80), (19,80)
+ *       41 19 -- -- -- -- 06 00 00 00 00 xx 11 13
+ *            Used after every "configuration sequence" (RQ 12, RQs 01/03/13).
+ *            xx is usually 0x00 but was 0x7e before starting data transfer
+ *            in unimodem mode. So, this might be an array of characters that
+ *            need special treatment ("commit all bufferd data"?), 11=^Q, 13=^S.
+ *
+ * Unimodem mode: use "modprobe ppp_async flag_time=0" as the device _needs_ two
+ * flags per packet.
+ */
+
+/* functions called if a device of this driver is connected/disconnected */
+static int gigaset_probe(struct usb_interface *interface,
+			 const struct usb_device_id *id);
+static void gigaset_disconnect(struct usb_interface *interface);
+
+/* functions called before/after suspend */
+static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
+static int gigaset_resume(struct usb_interface *intf);
+static int gigaset_pre_reset(struct usb_interface *intf);
+
+static struct gigaset_driver *driver;
+
+/* usb specific object needed to register this driver with the usb subsystem */
+static struct usb_driver gigaset_usb_driver = {
+	.name =		GIGASET_MODULENAME,
+	.probe =	gigaset_probe,
+	.disconnect =	gigaset_disconnect,
+	.id_table =	gigaset_table,
+	.suspend =	gigaset_suspend,
+	.resume =	gigaset_resume,
+	.reset_resume =	gigaset_resume,
+	.pre_reset =	gigaset_pre_reset,
+	.post_reset =	gigaset_resume,
+	.disable_hub_initiated_lpm = 1,
+};
+
+struct usb_cardstate {
+	struct usb_device	*udev;		/* usb device pointer */
+	struct usb_interface	*interface;	/* interface for this device */
+	int			busy;		/* bulk output in progress */
+
+	/* Output buffer */
+	unsigned char		*bulk_out_buffer;
+	int			bulk_out_size;
+	int			bulk_out_epnum;
+	struct urb		*bulk_out_urb;
+
+	/* Input buffer */
+	unsigned char		*rcvbuf;
+	int			rcvbuf_size;
+	struct urb		*read_urb;
+
+	char			bchars[6];		/* for request 0x19 */
+};
+
+static inline unsigned tiocm_to_gigaset(unsigned state)
+{
+	return ((state & TIOCM_DTR) ? 1 : 0) | ((state & TIOCM_RTS) ? 2 : 0);
+}
+
+static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
+				  unsigned new_state)
+{
+	struct usb_device *udev = cs->hw.usb->udev;
+	unsigned mask, val;
+	int r;
+
+	mask = tiocm_to_gigaset(old_state ^ new_state);
+	val = tiocm_to_gigaset(new_state);
+
+	gig_dbg(DEBUG_USBREQ, "set flags 0x%02x with mask 0x%02x", val, mask);
+	r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 7, 0x41,
+			    (val & 0xff) | ((mask & 0xff) << 8), 0,
+			    NULL, 0, 2000 /* timeout? */);
+	if (r < 0)
+		return r;
+	return 0;
+}
+
+/*
+ * Set M105 configuration value
+ * using undocumented device commands reverse engineered from USB traces
+ * of the Siemens Windows driver
+ */
+static int set_value(struct cardstate *cs, u8 req, u16 val)
+{
+	struct usb_device *udev = cs->hw.usb->udev;
+	int r, r2;
+
+	gig_dbg(DEBUG_USBREQ, "request %02x (%04x)",
+		(unsigned)req, (unsigned)val);
+	r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x12, 0x41,
+			    0xf /*?*/, 0, NULL, 0, 2000 /*?*/);
+	/* no idea what this does */
+	if (r < 0) {
+		dev_err(&udev->dev, "error %d on request 0x12\n", -r);
+		return r;
+	}
+
+	r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), req, 0x41,
+			    val, 0, NULL, 0, 2000 /*?*/);
+	if (r < 0)
+		dev_err(&udev->dev, "error %d on request 0x%02x\n",
+			-r, (unsigned)req);
+
+	r2 = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x19, 0x41,
+			     0, 0, cs->hw.usb->bchars, 6, 2000 /*?*/);
+	if (r2 < 0)
+		dev_err(&udev->dev, "error %d on request 0x19\n", -r2);
+
+	return r < 0 ? r : (r2 < 0 ? r2 : 0);
+}
+
+/*
+ * set the baud rate on the internal serial adapter
+ * using the undocumented parameter setting command
+ */
+static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
+{
+	u16 val;
+	u32 rate;
+
+	cflag &= CBAUD;
+
+	switch (cflag) {
+	case    B300: rate =     300; break;
+	case    B600: rate =     600; break;
+	case   B1200: rate =    1200; break;
+	case   B2400: rate =    2400; break;
+	case   B4800: rate =    4800; break;
+	case   B9600: rate =    9600; break;
+	case  B19200: rate =   19200; break;
+	case  B38400: rate =   38400; break;
+	case  B57600: rate =   57600; break;
+	case B115200: rate =  115200; break;
+	default:
+		rate =  9600;
+		dev_err(cs->dev, "unsupported baudrate request 0x%x,"
+			" using default of B9600\n", cflag);
+	}
+
+	val = 0x383fff / rate + 1;
+
+	return set_value(cs, 1, val);
+}
+
+/*
+ * set the line format on the internal serial adapter
+ * using the undocumented parameter setting command
+ */
+static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
+{
+	u16 val = 0;
+
+	/* set the parity */
+	if (cflag & PARENB)
+		val |= (cflag & PARODD) ? 0x10 : 0x20;
+
+	/* set the number of data bits */
+	switch (cflag & CSIZE) {
+	case CS5:
+		val |= 5 << 8; break;
+	case CS6:
+		val |= 6 << 8; break;
+	case CS7:
+		val |= 7 << 8; break;
+	case CS8:
+		val |= 8 << 8; break;
+	default:
+		dev_err(cs->dev, "CSIZE was not CS5-CS8, using default of 8\n");
+		val |= 8 << 8;
+		break;
+	}
+
+	/* set the number of stop bits */
+	if (cflag & CSTOPB) {
+		if ((cflag & CSIZE) == CS5)
+			val |= 1; /* 1.5 stop bits */
+		else
+			val |= 2; /* 2 stop bits */
+	}
+
+	return set_value(cs, 3, val);
+}
+
+
+/*============================================================================*/
+static int gigaset_init_bchannel(struct bc_state *bcs)
+{
+	/* nothing to do for M10x */
+	gigaset_bchannel_up(bcs);
+	return 0;
+}
+
+static int gigaset_close_bchannel(struct bc_state *bcs)
+{
+	/* nothing to do for M10x */
+	gigaset_bchannel_down(bcs);
+	return 0;
+}
+
+static int write_modem(struct cardstate *cs);
+static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb);
+
+
+/* Write tasklet handler: Continue sending current skb, or send command, or
+ * start sending an skb from the send queue.
+ */
+static void gigaset_modem_fill(unsigned long data)
+{
+	struct cardstate *cs = (struct cardstate *) data;
+	struct bc_state *bcs = &cs->bcs[0]; /* only one channel */
+	struct cmdbuf_t *cb;
+	int again;
+
+	gig_dbg(DEBUG_OUTPUT, "modem_fill");
+
+	if (cs->hw.usb->busy) {
+		gig_dbg(DEBUG_OUTPUT, "modem_fill: busy");
+		return;
+	}
+
+	do {
+		again = 0;
+		if (!bcs->tx_skb) { /* no skb is being sent */
+			cb = cs->cmdbuf;
+			if (cb) { /* commands to send? */
+				gig_dbg(DEBUG_OUTPUT, "modem_fill: cb");
+				if (send_cb(cs, cb) < 0) {
+					gig_dbg(DEBUG_OUTPUT,
+						"modem_fill: send_cb failed");
+					again = 1; /* no callback will be
+						      called! */
+				}
+			} else { /* skbs to send? */
+				bcs->tx_skb = skb_dequeue(&bcs->squeue);
+				if (bcs->tx_skb)
+					gig_dbg(DEBUG_INTR,
+						"Dequeued skb (Adr: %lx)!",
+						(unsigned long) bcs->tx_skb);
+			}
+		}
+
+		if (bcs->tx_skb) {
+			gig_dbg(DEBUG_OUTPUT, "modem_fill: tx_skb");
+			if (write_modem(cs) < 0) {
+				gig_dbg(DEBUG_OUTPUT,
+					"modem_fill: write_modem failed");
+				again = 1; /* no callback will be called! */
+			}
+		}
+	} while (again);
+}
+
+/*
+ * Interrupt Input URB completion routine
+ */
+static void gigaset_read_int_callback(struct urb *urb)
+{
+	struct cardstate *cs = urb->context;
+	struct inbuf_t *inbuf = cs->inbuf;
+	int status = urb->status;
+	int r;
+	unsigned numbytes;
+	unsigned char *src;
+	unsigned long flags;
+
+	if (!status) {
+		numbytes = urb->actual_length;
+
+		if (numbytes) {
+			src = cs->hw.usb->rcvbuf;
+			if (unlikely(*src))
+				dev_warn(cs->dev,
+					 "%s: There was no leading 0, but 0x%02x!\n",
+					 __func__, (unsigned) *src);
+			++src; /* skip leading 0x00 */
+			--numbytes;
+			if (gigaset_fill_inbuf(inbuf, src, numbytes)) {
+				gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
+				gigaset_schedule_event(inbuf->cs);
+			}
+		} else
+			gig_dbg(DEBUG_INTR, "Received zero block length");
+	} else {
+		/* The urb might have been killed. */
+		gig_dbg(DEBUG_ANY, "%s - nonzero status received: %d",
+			__func__, status);
+		if (status == -ENOENT || status == -ESHUTDOWN)
+			/* killed or endpoint shutdown: don't resubmit */
+			return;
+	}
+
+	/* resubmit URB */
+	spin_lock_irqsave(&cs->lock, flags);
+	if (!cs->connected) {
+		spin_unlock_irqrestore(&cs->lock, flags);
+		pr_err("%s: disconnected\n", __func__);
+		return;
+	}
+	r = usb_submit_urb(urb, GFP_ATOMIC);
+	spin_unlock_irqrestore(&cs->lock, flags);
+	if (r)
+		dev_err(cs->dev, "error %d resubmitting URB\n", -r);
+}
+
+
+/* This callback routine is called when data was transmitted to the device. */
+static void gigaset_write_bulk_callback(struct urb *urb)
+{
+	struct cardstate *cs = urb->context;
+	int status = urb->status;
+	unsigned long flags;
+
+	switch (status) {
+	case 0:			/* normal completion */
+		break;
+	case -ENOENT:		/* killed */
+		gig_dbg(DEBUG_ANY, "%s: killed", __func__);
+		cs->hw.usb->busy = 0;
+		return;
+	default:
+		dev_err(cs->dev, "bulk transfer failed (status %d)\n",
+			-status);
+		/* That's all we can do. Communication problems
+		   are handled by timeouts or network protocols. */
+	}
+
+	spin_lock_irqsave(&cs->lock, flags);
+	if (!cs->connected) {
+		pr_err("%s: disconnected\n", __func__);
+	} else {
+		cs->hw.usb->busy = 0;
+		tasklet_schedule(&cs->write_tasklet);
+	}
+	spin_unlock_irqrestore(&cs->lock, flags);
+}
+
+static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb)
+{
+	struct cmdbuf_t *tcb;
+	unsigned long flags;
+	int count;
+	int status = -ENOENT;
+	struct usb_cardstate *ucs = cs->hw.usb;
+
+	do {
+		if (!cb->len) {
+			tcb = cb;
+
+			spin_lock_irqsave(&cs->cmdlock, flags);
+			cs->cmdbytes -= cs->curlen;
+			gig_dbg(DEBUG_OUTPUT, "send_cb: sent %u bytes, %u left",
+				cs->curlen, cs->cmdbytes);
+			cs->cmdbuf = cb = cb->next;
+			if (cb) {
+				cb->prev = NULL;
+				cs->curlen = cb->len;
+			} else {
+				cs->lastcmdbuf = NULL;
+				cs->curlen = 0;
+			}
+			spin_unlock_irqrestore(&cs->cmdlock, flags);
+
+			if (tcb->wake_tasklet)
+				tasklet_schedule(tcb->wake_tasklet);
+			kfree(tcb);
+		}
+		if (cb) {
+			count = min(cb->len, ucs->bulk_out_size);
+			gig_dbg(DEBUG_OUTPUT, "send_cb: send %d bytes", count);
+
+			usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev,
+					  usb_sndbulkpipe(ucs->udev,
+							  ucs->bulk_out_epnum),
+					  cb->buf + cb->offset, count,
+					  gigaset_write_bulk_callback, cs);
+
+			cb->offset += count;
+			cb->len -= count;
+			ucs->busy = 1;
+
+			spin_lock_irqsave(&cs->lock, flags);
+			status = cs->connected ?
+				usb_submit_urb(ucs->bulk_out_urb, GFP_ATOMIC) :
+				-ENODEV;
+			spin_unlock_irqrestore(&cs->lock, flags);
+
+			if (status) {
+				ucs->busy = 0;
+				dev_err(cs->dev,
+					"could not submit urb (error %d)\n",
+					-status);
+				cb->len = 0; /* skip urb => remove cb+wakeup
+						in next loop cycle */
+			}
+		}
+	} while (cb && status); /* next command on error */
+
+	return status;
+}
+
+/* Send command to device. */
+static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb)
+{
+	unsigned long flags;
+	int len;
+
+	gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
+			   DEBUG_TRANSCMD : DEBUG_LOCKCMD,
+			   "CMD Transmit", cb->len, cb->buf);
+
+	spin_lock_irqsave(&cs->cmdlock, flags);
+	cb->prev = cs->lastcmdbuf;
+	if (cs->lastcmdbuf)
+		cs->lastcmdbuf->next = cb;
+	else {
+		cs->cmdbuf = cb;
+		cs->curlen = cb->len;
+	}
+	cs->cmdbytes += cb->len;
+	cs->lastcmdbuf = cb;
+	spin_unlock_irqrestore(&cs->cmdlock, flags);
+
+	spin_lock_irqsave(&cs->lock, flags);
+	len = cb->len;
+	if (cs->connected)
+		tasklet_schedule(&cs->write_tasklet);
+	spin_unlock_irqrestore(&cs->lock, flags);
+	return len;
+}
+
+static int gigaset_write_room(struct cardstate *cs)
+{
+	unsigned bytes;
+
+	bytes = cs->cmdbytes;
+	return bytes < IF_WRITEBUF ? IF_WRITEBUF - bytes : 0;
+}
+
+static int gigaset_chars_in_buffer(struct cardstate *cs)
+{
+	return cs->cmdbytes;
+}
+
+/*
+ * set the break characters on the internal serial adapter
+ * using undocumented device commands reverse engineered from USB traces
+ * of the Siemens Windows driver
+ */
+static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
+{
+	struct usb_device *udev = cs->hw.usb->udev;
+
+	gigaset_dbg_buffer(DEBUG_USBREQ, "brkchars", 6, buf);
+	memcpy(cs->hw.usb->bchars, buf, 6);
+	return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x19, 0x41,
+			       0, 0, &buf, 6, 2000);
+}
+
+static void gigaset_freebcshw(struct bc_state *bcs)
+{
+	/* unused */
+}
+
+/* Initialize the b-channel structure */
+static int gigaset_initbcshw(struct bc_state *bcs)
+{
+	/* unused */
+	bcs->hw.usb = NULL;
+	return 0;
+}
+
+static void gigaset_reinitbcshw(struct bc_state *bcs)
+{
+	/* nothing to do for M10x */
+}
+
+static void gigaset_freecshw(struct cardstate *cs)
+{
+	tasklet_kill(&cs->write_tasklet);
+	kfree(cs->hw.usb);
+}
+
+static int gigaset_initcshw(struct cardstate *cs)
+{
+	struct usb_cardstate *ucs;
+
+	cs->hw.usb = ucs =
+		kmalloc(sizeof(struct usb_cardstate), GFP_KERNEL);
+	if (!ucs) {
+		pr_err("out of memory\n");
+		return -ENOMEM;
+	}
+
+	ucs->bchars[0] = 0;
+	ucs->bchars[1] = 0;
+	ucs->bchars[2] = 0;
+	ucs->bchars[3] = 0;
+	ucs->bchars[4] = 0x11;
+	ucs->bchars[5] = 0x13;
+	ucs->bulk_out_buffer = NULL;
+	ucs->bulk_out_urb = NULL;
+	ucs->read_urb = NULL;
+	tasklet_init(&cs->write_tasklet,
+		     gigaset_modem_fill, (unsigned long) cs);
+
+	return 0;
+}
+
+/* Send data from current skb to the device. */
+static int write_modem(struct cardstate *cs)
+{
+	int ret = 0;
+	int count;
+	struct bc_state *bcs = &cs->bcs[0]; /* only one channel */
+	struct usb_cardstate *ucs = cs->hw.usb;
+	unsigned long flags;
+
+	gig_dbg(DEBUG_OUTPUT, "len: %d...", bcs->tx_skb->len);
+
+	if (!bcs->tx_skb->len) {
+		dev_kfree_skb_any(bcs->tx_skb);
+		bcs->tx_skb = NULL;
+		return -EINVAL;
+	}
+
+	/* Copy data to bulk out buffer and transmit data */
+	count = min(bcs->tx_skb->len, (unsigned) ucs->bulk_out_size);
+	skb_copy_from_linear_data(bcs->tx_skb, ucs->bulk_out_buffer, count);
+	skb_pull(bcs->tx_skb, count);
+	ucs->busy = 1;
+	gig_dbg(DEBUG_OUTPUT, "write_modem: send %d bytes", count);
+
+	spin_lock_irqsave(&cs->lock, flags);
+	if (cs->connected) {
+		usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev,
+				  usb_sndbulkpipe(ucs->udev,
+						  ucs->bulk_out_epnum),
+				  ucs->bulk_out_buffer, count,
+				  gigaset_write_bulk_callback, cs);
+		ret = usb_submit_urb(ucs->bulk_out_urb, GFP_ATOMIC);
+	} else {
+		ret = -ENODEV;
+	}
+	spin_unlock_irqrestore(&cs->lock, flags);
+
+	if (ret) {
+		dev_err(cs->dev, "could not submit urb (error %d)\n", -ret);
+		ucs->busy = 0;
+	}
+
+	if (!bcs->tx_skb->len) {
+		/* skb sent completely */
+		gigaset_skb_sent(bcs, bcs->tx_skb);
+
+		gig_dbg(DEBUG_INTR, "kfree skb (Adr: %lx)!",
+			(unsigned long) bcs->tx_skb);
+		dev_kfree_skb_any(bcs->tx_skb);
+		bcs->tx_skb = NULL;
+	}
+
+	return ret;
+}
+
+static int gigaset_probe(struct usb_interface *interface,
+			 const struct usb_device_id *id)
+{
+	int retval;
+	struct usb_device *udev = interface_to_usbdev(interface);
+	struct usb_host_interface *hostif = interface->cur_altsetting;
+	struct cardstate *cs = NULL;
+	struct usb_cardstate *ucs = NULL;
+	struct usb_endpoint_descriptor *endpoint;
+	int buffer_size;
+
+	gig_dbg(DEBUG_ANY, "%s: Check if device matches ...", __func__);
+
+	/* See if the device offered us matches what we can accept */
+	if ((le16_to_cpu(udev->descriptor.idVendor)  != USB_M105_VENDOR_ID) ||
+	    (le16_to_cpu(udev->descriptor.idProduct) != USB_M105_PRODUCT_ID)) {
+		gig_dbg(DEBUG_ANY, "device ID (0x%x, 0x%x) not for me - skip",
+			le16_to_cpu(udev->descriptor.idVendor),
+			le16_to_cpu(udev->descriptor.idProduct));
+		return -ENODEV;
+	}
+	if (hostif->desc.bInterfaceNumber != 0) {
+		gig_dbg(DEBUG_ANY, "interface %d not for me - skip",
+			hostif->desc.bInterfaceNumber);
+		return -ENODEV;
+	}
+	if (hostif->desc.bAlternateSetting != 0) {
+		dev_notice(&udev->dev, "unsupported altsetting %d - skip",
+			   hostif->desc.bAlternateSetting);
+		return -ENODEV;
+	}
+	if (hostif->desc.bInterfaceClass != 255) {
+		dev_notice(&udev->dev, "unsupported interface class %d - skip",
+			   hostif->desc.bInterfaceClass);
+		return -ENODEV;
+	}
+
+	dev_info(&udev->dev, "%s: Device matched ... !\n", __func__);
+
+	/* allocate memory for our device state and initialize it */
+	cs = gigaset_initcs(driver, 1, 1, 0, cidmode, GIGASET_MODULENAME);
+	if (!cs)
+		return -ENODEV;
+	ucs = cs->hw.usb;
+
+	/* save off device structure ptrs for later use */
+	usb_get_dev(udev);
+	ucs->udev = udev;
+	ucs->interface = interface;
+	cs->dev = &interface->dev;
+
+	/* save address of controller structure */
+	usb_set_intfdata(interface, cs);
+
+	endpoint = &hostif->endpoint[0].desc;
+
+	buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
+	ucs->bulk_out_size = buffer_size;
+	ucs->bulk_out_epnum = usb_endpoint_num(endpoint);
+	ucs->bulk_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
+	if (!ucs->bulk_out_buffer) {
+		dev_err(cs->dev, "Couldn't allocate bulk_out_buffer\n");
+		retval = -ENOMEM;
+		goto error;
+	}
+
+	ucs->bulk_out_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!ucs->bulk_out_urb) {
+		dev_err(cs->dev, "Couldn't allocate bulk_out_urb\n");
+		retval = -ENOMEM;
+		goto error;
+	}
+
+	endpoint = &hostif->endpoint[1].desc;
+
+	ucs->busy = 0;
+
+	ucs->read_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!ucs->read_urb) {
+		dev_err(cs->dev, "No free urbs available\n");
+		retval = -ENOMEM;
+		goto error;
+	}
+	buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
+	ucs->rcvbuf_size = buffer_size;
+	ucs->rcvbuf = kmalloc(buffer_size, GFP_KERNEL);
+	if (!ucs->rcvbuf) {
+		dev_err(cs->dev, "Couldn't allocate rcvbuf\n");
+		retval = -ENOMEM;
+		goto error;
+	}
+	/* Fill the interrupt urb and send it to the core */
+	usb_fill_int_urb(ucs->read_urb, udev,
+			 usb_rcvintpipe(udev, usb_endpoint_num(endpoint)),
+			 ucs->rcvbuf, buffer_size,
+			 gigaset_read_int_callback,
+			 cs, endpoint->bInterval);
+
+	retval = usb_submit_urb(ucs->read_urb, GFP_KERNEL);
+	if (retval) {
+		dev_err(cs->dev, "Could not submit URB (error %d)\n", -retval);
+		goto error;
+	}
+
+	/* tell common part that the device is ready */
+	if (startmode == SM_LOCKED)
+		cs->mstate = MS_LOCKED;
+
+	retval = gigaset_start(cs);
+	if (retval < 0) {
+		tasklet_kill(&cs->write_tasklet);
+		goto error;
+	}
+	return 0;
+
+error:
+	usb_kill_urb(ucs->read_urb);
+	kfree(ucs->bulk_out_buffer);
+	usb_free_urb(ucs->bulk_out_urb);
+	kfree(ucs->rcvbuf);
+	usb_free_urb(ucs->read_urb);
+	usb_set_intfdata(interface, NULL);
+	ucs->read_urb = ucs->bulk_out_urb = NULL;
+	ucs->rcvbuf = ucs->bulk_out_buffer = NULL;
+	usb_put_dev(ucs->udev);
+	ucs->udev = NULL;
+	ucs->interface = NULL;
+	gigaset_freecs(cs);
+	return retval;
+}
+
+static void gigaset_disconnect(struct usb_interface *interface)
+{
+	struct cardstate *cs;
+	struct usb_cardstate *ucs;
+
+	cs = usb_get_intfdata(interface);
+	ucs = cs->hw.usb;
+
+	dev_info(cs->dev, "disconnecting Gigaset USB adapter\n");
+
+	usb_kill_urb(ucs->read_urb);
+
+	gigaset_stop(cs);
+
+	usb_set_intfdata(interface, NULL);
+	tasklet_kill(&cs->write_tasklet);
+
+	usb_kill_urb(ucs->bulk_out_urb);
+
+	kfree(ucs->bulk_out_buffer);
+	usb_free_urb(ucs->bulk_out_urb);
+	kfree(ucs->rcvbuf);
+	usb_free_urb(ucs->read_urb);
+	ucs->read_urb = ucs->bulk_out_urb = NULL;
+	ucs->rcvbuf = ucs->bulk_out_buffer = NULL;
+
+	usb_put_dev(ucs->udev);
+	ucs->interface = NULL;
+	ucs->udev = NULL;
+	cs->dev = NULL;
+	gigaset_freecs(cs);
+}
+
+/* gigaset_suspend
+ * This function is called before the USB connection is suspended or reset.
+ */
+static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
+{
+	struct cardstate *cs = usb_get_intfdata(intf);
+
+	/* stop activity */
+	cs->connected = 0;	/* prevent rescheduling */
+	usb_kill_urb(cs->hw.usb->read_urb);
+	tasklet_kill(&cs->write_tasklet);
+	usb_kill_urb(cs->hw.usb->bulk_out_urb);
+
+	gig_dbg(DEBUG_SUSPEND, "suspend complete");
+	return 0;
+}
+
+/* gigaset_resume
+ * This function is called after the USB connection has been resumed or reset.
+ */
+static int gigaset_resume(struct usb_interface *intf)
+{
+	struct cardstate *cs = usb_get_intfdata(intf);
+	int rc;
+
+	/* resubmit interrupt URB */
+	cs->connected = 1;
+	rc = usb_submit_urb(cs->hw.usb->read_urb, GFP_KERNEL);
+	if (rc) {
+		dev_err(cs->dev, "Could not submit read URB (error %d)\n", -rc);
+		return rc;
+	}
+
+	gig_dbg(DEBUG_SUSPEND, "resume complete");
+	return 0;
+}
+
+/* gigaset_pre_reset
+ * This function is called before the USB connection is reset.
+ */
+static int gigaset_pre_reset(struct usb_interface *intf)
+{
+	/* same as suspend */
+	return gigaset_suspend(intf, PMSG_ON);
+}
+
+static const struct gigaset_ops ops = {
+	gigaset_write_cmd,
+	gigaset_write_room,
+	gigaset_chars_in_buffer,
+	gigaset_brkchars,
+	gigaset_init_bchannel,
+	gigaset_close_bchannel,
+	gigaset_initbcshw,
+	gigaset_freebcshw,
+	gigaset_reinitbcshw,
+	gigaset_initcshw,
+	gigaset_freecshw,
+	gigaset_set_modem_ctrl,
+	gigaset_baud_rate,
+	gigaset_set_line_ctrl,
+	gigaset_m10x_send_skb,
+	gigaset_m10x_input,
+};
+
+/*
+ * This function is called while kernel-module is loaded
+ */
+static int __init usb_gigaset_init(void)
+{
+	int result;
+
+	/* allocate memory for our driver state and initialize it */
+	driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
+				    GIGASET_MODULENAME, GIGASET_DEVNAME,
+				    &ops, THIS_MODULE);
+	if (driver == NULL) {
+		result = -ENOMEM;
+		goto error;
+	}
+
+	/* register this driver with the USB subsystem */
+	result = usb_register(&gigaset_usb_driver);
+	if (result < 0) {
+		pr_err("error %d registering USB driver\n", -result);
+		goto error;
+	}
+
+	pr_info(DRIVER_DESC "\n");
+	return 0;
+
+error:
+	if (driver)
+		gigaset_freedriver(driver);
+	driver = NULL;
+	return result;
+}
+
+/*
+ * This function is called while unloading the kernel-module
+ */
+static void __exit usb_gigaset_exit(void)
+{
+	int i;
+
+	gigaset_blockdriver(driver); /* => probe will fail
+				      * => no gigaset_start any more
+				      */
+
+	/* stop all connected devices */
+	for (i = 0; i < driver->minors; i++)
+		gigaset_shutdown(driver->cs + i);
+
+	/* from now on, no isdn callback should be possible */
+
+	/* deregister this driver with the USB subsystem */
+	usb_deregister(&gigaset_usb_driver);
+	/* this will call the disconnect-callback */
+	/* from now on, no disconnect/probe callback should be running */
+
+	gigaset_freedriver(driver);
+	driver = NULL;
+}
+
+
+module_init(usb_gigaset_init);
+module_exit(usb_gigaset_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+
+MODULE_LICENSE("GPL");