Fixed MTP to work with TWRP

drivers/media/usb/dvb-usb/dvb-usb-firmware.c

@@ -0,0 +1,146 @@
+/* dvb-usb-firmware.c is part of the DVB USB library.
+ *
+ * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@desy.de)
+ * see dvb-usb-init.c for copyright information.
+ *
+ * This file contains functions for downloading the firmware to Cypress FX 1 and 2 based devices.
+ *
+ * FIXME: This part does actually not belong to dvb-usb, but to the usb-subsystem.
+ */
+#include "dvb-usb-common.h"
+
+#include <linux/usb.h>
+
+struct usb_cypress_controller {
+	int id;
+	const char *name;       /* name of the usb controller */
+	u16 cpu_cs_register;    /* needs to be restarted, when the firmware has been downloaded. */
+};
+
+static struct usb_cypress_controller cypress[] = {
+	{ .id = DEVICE_SPECIFIC, .name = "Device specific", .cpu_cs_register = 0 },
+	{ .id = CYPRESS_AN2135,  .name = "Cypress AN2135",  .cpu_cs_register = 0x7f92 },
+	{ .id = CYPRESS_AN2235,  .name = "Cypress AN2235",  .cpu_cs_register = 0x7f92 },
+	{ .id = CYPRESS_FX2,     .name = "Cypress FX2",     .cpu_cs_register = 0xe600 },
+};
+
+/*
+ * load a firmware packet to the device
+ */
+static int usb_cypress_writemem(struct usb_device *udev,u16 addr,u8 *data, u8 len)
+{
+	return usb_control_msg(udev, usb_sndctrlpipe(udev,0),
+			0xa0, USB_TYPE_VENDOR, addr, 0x00, data, len, 5000);
+}
+
+int usb_cypress_load_firmware(struct usb_device *udev, const struct firmware *fw, int type)
+{
+	struct hexline hx;
+	u8 reset;
+	int ret,pos=0;
+
+	/* stop the CPU */
+	reset = 1;
+	if ((ret = usb_cypress_writemem(udev,cypress[type].cpu_cs_register,&reset,1)) != 1)
+		err("could not stop the USB controller CPU.");
+
+	while ((ret = dvb_usb_get_hexline(fw,&hx,&pos)) > 0) {
+		deb_fw("writing to address 0x%04x (buffer: 0x%02x %02x)\n",hx.addr,hx.len,hx.chk);
+		ret = usb_cypress_writemem(udev,hx.addr,hx.data,hx.len);
+
+		if (ret != hx.len) {
+			err("error while transferring firmware "
+				"(transferred size: %d, block size: %d)",
+				ret,hx.len);
+			ret = -EINVAL;
+			break;
+		}
+	}
+	if (ret < 0) {
+		err("firmware download failed at %d with %d",pos,ret);
+		return ret;
+	}
+
+	if (ret == 0) {
+		/* restart the CPU */
+		reset = 0;
+		if (ret || usb_cypress_writemem(udev,cypress[type].cpu_cs_register,&reset,1) != 1) {
+			err("could not restart the USB controller CPU.");
+			ret = -EINVAL;
+		}
+	} else
+		ret = -EIO;
+
+	return ret;
+}
+EXPORT_SYMBOL(usb_cypress_load_firmware);
+
+int dvb_usb_download_firmware(struct usb_device *udev, struct dvb_usb_device_properties *props)
+{
+	int ret;
+	const struct firmware *fw = NULL;
+
+	if ((ret = request_firmware(&fw, props->firmware, &udev->dev)) != 0) {
+		err("did not find the firmware file. (%s) "
+			"Please see linux/Documentation/dvb/ for more details on firmware-problems. (%d)",
+			props->firmware,ret);
+		return ret;
+	}
+
+	info("downloading firmware from file '%s'",props->firmware);
+
+	switch (props->usb_ctrl) {
+		case CYPRESS_AN2135:
+		case CYPRESS_AN2235:
+		case CYPRESS_FX2:
+			ret = usb_cypress_load_firmware(udev, fw, props->usb_ctrl);
+			break;
+		case DEVICE_SPECIFIC:
+			if (props->download_firmware)
+				ret = props->download_firmware(udev,fw);
+			else {
+				err("BUG: driver didn't specified a download_firmware-callback, although it claims to have a DEVICE_SPECIFIC one.");
+				ret = -EINVAL;
+			}
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+	}
+
+	release_firmware(fw);
+	return ret;
+}
+
+int dvb_usb_get_hexline(const struct firmware *fw, struct hexline *hx,
+			       int *pos)
+{
+	u8 *b = (u8 *) &fw->data[*pos];
+	int data_offs = 4;
+	if (*pos >= fw->size)
+		return 0;
+
+	memset(hx,0,sizeof(struct hexline));
+
+	hx->len  = b[0];
+
+	if ((*pos + hx->len + 4) >= fw->size)
+		return -EINVAL;
+
+	hx->addr = b[1] | (b[2] << 8);
+	hx->type = b[3];
+
+	if (hx->type == 0x04) {
+		/* b[4] and b[5] are the Extended linear address record data field */
+		hx->addr |= (b[4] << 24) | (b[5] << 16);
+/*		hx->len -= 2;
+		data_offs += 2; */
+	}
+	memcpy(hx->data,&b[data_offs],hx->len);
+	hx->chk = b[hx->len + data_offs];
+
+	*pos += hx->len + 5;
+
+	return *pos;
+}
+EXPORT_SYMBOL(dvb_usb_get_hexline);