Fixed MTP to work with TWRP

drivers/usb/serial/navman.c

@@ -0,0 +1,118 @@
+/*
+ * Navman Serial USB driver
+ *
+ * Copyright (C) 2006 Greg Kroah-Hartman <gregkh@suse.de>
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License
+ *	version 2 as published by the Free Software Foundation.
+ *
+ * TODO:
+ *	Add termios method that uses copy_hw but also kills all echo
+ *	flags as the navman is rx only so cannot echo.
+ */
+
+#include <linux/gfp.h>
+#include <linux/kernel.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+
+static const struct usb_device_id id_table[] = {
+	{ USB_DEVICE(0x0a99, 0x0001) },	/* Talon Technology device */
+	{ USB_DEVICE(0x0df7, 0x0900) },	/* Mobile Action i-gotU */
+	{ },
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+static void navman_read_int_callback(struct urb *urb)
+{
+	struct usb_serial_port *port = urb->context;
+	unsigned char *data = urb->transfer_buffer;
+	int status = urb->status;
+	int result;
+
+	switch (status) {
+	case 0:
+		/* success */
+		break;
+	case -ECONNRESET:
+	case -ENOENT:
+	case -ESHUTDOWN:
+		/* this urb is terminated, clean up */
+		dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
+			__func__, status);
+		return;
+	default:
+		dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
+			__func__, status);
+		goto exit;
+	}
+
+	usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
+
+	if (urb->actual_length) {
+		tty_insert_flip_string(&port->port, data, urb->actual_length);
+		tty_flip_buffer_push(&port->port);
+	}
+
+exit:
+	result = usb_submit_urb(urb, GFP_ATOMIC);
+	if (result)
+		dev_err(&urb->dev->dev,
+			"%s - Error %d submitting interrupt urb\n",
+			__func__, result);
+}
+
+static int navman_open(struct tty_struct *tty, struct usb_serial_port *port)
+{
+	int result = 0;
+
+	if (port->interrupt_in_urb) {
+		dev_dbg(&port->dev, "%s - adding interrupt input for treo\n",
+			__func__);
+		result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
+		if (result)
+			dev_err(&port->dev,
+				"%s - failed submitting interrupt urb, error %d\n",
+				__func__, result);
+	}
+	return result;
+}
+
+static void navman_close(struct usb_serial_port *port)
+{
+	usb_kill_urb(port->interrupt_in_urb);
+}
+
+static int navman_write(struct tty_struct *tty, struct usb_serial_port *port,
+			const unsigned char *buf, int count)
+{
+	/*
+	 * This device can't write any data, only read from the device
+	 */
+	return -EOPNOTSUPP;
+}
+
+static struct usb_serial_driver navman_device = {
+	.driver = {
+		.owner =	THIS_MODULE,
+		.name =		"navman",
+	},
+	.id_table =		id_table,
+	.num_ports =		1,
+	.open =			navman_open,
+	.close = 		navman_close,
+	.write = 		navman_write,
+	.read_int_callback =	navman_read_int_callback,
+};
+
+static struct usb_serial_driver * const serial_drivers[] = {
+	&navman_device, NULL
+};
+
+module_usb_serial_driver(serial_drivers, id_table);
+
+MODULE_LICENSE("GPL");