USB: serial: remove zte_ev driver

The zte_ev driver is based on code (once) distributed by ZTE that still
appears to originally have been reverse-engineered and bolted onto the
generic driver.

A closer analysis of the zte_ev setup code reveals that it consists of
standard CDC requests (SET/GET_LINE_CODING and SET_CONTROL_LINE_STATE)
but unfortunately fails to get some of those right. In particular, as
reported by Lei Liu, it fails to lower DTR/RTS on close. It also appears
that the control requests lack the interface argument.

Since line control is already handled properly by the option driver, and
the SET/GET_LINE_CODING requests appears to be redundant (amounts to a
SET 9600 8N1) let's remove the redundant zte_ev driver.

Also move the remaining ZTE PIDs to the generic option modem driver.

Reported-by: Lei Liu <liu.lei78@zte.com.cn>
Signed-off-by: Johan Hovold <johan@kernel.org>

drivers/usb/serial/Kconfig

@@ -684,14 +684,6 @@ config USB_SERIAL_WISHBONE
 	  To compile this driver as a module, choose M here: the
 	  module will be called wishbone-serial.
 
-config USB_SERIAL_ZTE
-	tristate "ZTE USB serial driver"
-	help
-	  Say Y here if you want to use a ZTE USB to serial device.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called zte.
-
 config USB_SERIAL_SSU100
 	tristate "USB Quatech SSU-100 Single Port Serial Driver"
 	help

drivers/usb/serial/Makefile

@@ -60,4 +60,3 @@ obj-$(CONFIG_USB_SERIAL_WISHBONE)		+= wishbone-serial.o
 obj-$(CONFIG_USB_SERIAL_WHITEHEAT)		+= whiteheat.o
 obj-$(CONFIG_USB_SERIAL_XIRCOM)			+= keyspan_pda.o
 obj-$(CONFIG_USB_SERIAL_XSENS_MT)		+= xsens_mt.o
-obj-$(CONFIG_USB_SERIAL_ZTE)			+= zte_ev.o

drivers/usb/serial/option.c

@@ -276,6 +276,7 @@ static void option_instat_callback(struct urb *urb);
 #define ZTE_PRODUCT_MF628			0x0015
 #define ZTE_PRODUCT_MF626			0x0031
 #define ZTE_PRODUCT_AC2726			0xfff1
+#define ZTE_PRODUCT_MG880			0xfffd
 #define ZTE_PRODUCT_CDMA_TECH			0xfffe
 #define ZTE_PRODUCT_AC8710T			0xffff
 #define ZTE_PRODUCT_MC2718			0xffe8
@@ -1560,7 +1561,15 @@ static const struct usb_device_id option_ids[] = {
 	{ USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, 0xff92, 0xff, 0xff, 0xff) },
 	{ USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, 0xff93, 0xff, 0xff, 0xff) },
 	{ USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, 0xff94, 0xff, 0xff, 0xff) },
-
+	{ USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, 0xffec, 0xff, 0xff, 0xff) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, 0xffee, 0xff, 0xff, 0xff) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, 0xfff6, 0xff, 0xff, 0xff) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, 0xfff7, 0xff, 0xff, 0xff) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, 0xfff8, 0xff, 0xff, 0xff) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, 0xfff9, 0xff, 0xff, 0xff) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, 0xfffb, 0xff, 0xff, 0xff) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, 0xfffc, 0xff, 0xff, 0xff) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, ZTE_PRODUCT_MG880, 0xff, 0xff, 0xff) },
 	{ USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, ZTE_PRODUCT_CDMA_TECH, 0xff, 0xff, 0xff) },
 	{ USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, ZTE_PRODUCT_AC2726, 0xff, 0xff, 0xff) },
 	{ USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, ZTE_PRODUCT_AC8710T, 0xff, 0xff, 0xff) },

drivers/usb/serial/zte_ev.c

@@ -1,305 +0,0 @@
-/*
- * ZTE_EV USB serial driver
- *
- * Copyright (C) 2012 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
- * Copyright (C) 2012 Linux Foundation
- *
- * 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.
- *
- * This driver is based on code found in a ZTE_ENV patch that modified
- * the usb-serial generic driver.  Comments were left in that I think
- * show the commands used to talk to the device, but I am not sure.
- */
-#include <linux/kernel.h>
-#include <linux/tty.h>
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/usb.h>
-#include <linux/usb/serial.h>
-#include <linux/uaccess.h>
-
-#define  MAX_SETUP_DATA_SIZE	32
-
-static void debug_data(struct device *dev, const char *function, int len,
-		       const unsigned char *data, int result)
-{
-	dev_dbg(dev, "result = %d\n", result);
-	if (result == len)
-		dev_dbg(dev, "%s - length = %d, data = %*ph\n", function,
-			len, len, data);
-}
-
-static int zte_ev_usb_serial_open(struct tty_struct *tty,
-				  struct usb_serial_port *port)
-{
-	struct usb_device *udev = port->serial->dev;
-	struct device *dev = &port->dev;
-	int result = 0;
-	int len;
-	unsigned char *buf;
-
-	buf = kmalloc(MAX_SETUP_DATA_SIZE, GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
-
-	/* send 1st ctl cmd(CTL    21 22 01 00  00 00 00 00) */
-	len = 0;
-	result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
-				 0x22, 0x21,
-				 0x0001, 0x0000, NULL, len,
-				 USB_CTRL_GET_TIMEOUT);
-	dev_dbg(dev, "result = %d\n", result);
-
-	/* send 2st cmd and receive data */
-	/*
-	 * 16.0  CTL    a1 21 00 00  00 00 07 00   CLASS              25.1.0(5)
-	 * 16.0  DI     00 96 00 00  00 00 08
-	 */
-	len = 0x0007;
-	result = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
-				 0x21, 0xa1,
-				 0x0000, 0x0000, buf, len,
-				 USB_CTRL_GET_TIMEOUT);
-	debug_data(dev, __func__, len, buf, result);
-
-	/* send 3rd cmd */
-	/*
-	 * 16.0 CTL    21 20 00 00  00 00 07 00    CLASS                30.1.0
-	 * 16.0 DO     80 25 00 00  00 00 08       .%.....              30.2.0
-	 */
-	len = 0x0007;
-	buf[0] = 0x80;
-	buf[1] = 0x25;
-	buf[2] = 0x00;
-	buf[3] = 0x00;
-	buf[4] = 0x00;
-	buf[5] = 0x00;
-	buf[6] = 0x08;
-	result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
-				 0x20, 0x21,
-				 0x0000, 0x0000, buf, len,
-				 USB_CTRL_GET_TIMEOUT);
-	debug_data(dev, __func__, len, buf, result);
-
-	/* send 4th cmd */
-	/*
-	 * 16.0 CTL    21 22 03 00  00 00 00 00
-	 */
-	len = 0;
-	result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
-				 0x22, 0x21,
-				 0x0003, 0x0000, NULL, len,
-				 USB_CTRL_GET_TIMEOUT);
-	dev_dbg(dev, "result = %d\n", result);
-
-	/* send 5th cmd */
-	/*
-	 * 16.0  CTL    a1 21 00 00  00 00 07 00   CLASS               33.1.0
-	 * 16.0  DI     80 25 00 00  00 00 08
-	 */
-	len = 0x0007;
-	result = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
-				 0x21, 0xa1,
-				 0x0000, 0x0000, buf, len,
-				 USB_CTRL_GET_TIMEOUT);
-	debug_data(dev, __func__, len, buf, result);
-
-	/* send 6th cmd */
-	/*
-	 * 16.0  CTL    21 20 00 00  00 00 07 00    CLASS               34.1.0
-	 * 16.0  DO     80 25 00 00  00 00 08
-	 */
-	len = 0x0007;
-	buf[0] = 0x80;
-	buf[1] = 0x25;
-	buf[2] = 0x00;
-	buf[3] = 0x00;
-	buf[4] = 0x00;
-	buf[5] = 0x00;
-	buf[6] = 0x08;
-	result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
-				 0x20, 0x21,
-				 0x0000, 0x0000, buf, len,
-				 USB_CTRL_GET_TIMEOUT);
-	debug_data(dev, __func__, len, buf, result);
-	kfree(buf);
-
-	return usb_serial_generic_open(tty, port);
-}
-
-/*
- *       CTL    21 22 02 00  00 00 00 00         CLASS               338.1.0
- *
- * 16.1  DI     a1 20 00 00  00 00 02 00  02 00  . ........          340.1.0
- * 16.0  CTL    21 22 03 00  00 00 00 00         CLASS               341.1.0
- *
- * 16.0  CTL    a1 21 00 00  00 00 07 00         CLASS               346.1.0(3)
- * 16.0  DI     00 08 07 00  00 00 08            .......             346.2.0
- *
- * 16.0  CTL    21 20 00 00  00 00 07 00         CLASS               349.1.0
- * 16.0  DO     00 c2 01 00  00 00 08            .......             349.2.0
- *
- * 16.0  CTL    21 22 03 00  00 00 00 00         CLASS               350.1.0(2)
- *
- * 16.0  CTL    a1 21 00 00  00 00 07 00         CLASS               352.1.0
- * 16.0  DI     00 c2 01 00  00 00 08            .......             352.2.0
- *
- * 16.1  DI     a1 20 00 00  00 00 02 00  02 00  . ........          353.1.0
- *
- * 16.0  CTL    21 20 00 00  00 00 07 00         CLASS               354.1.0
- * 16.0  DO     00 c2 01 00  00 00 08            .......             354.2.0
- *
- * 16.0  CTL    21 22 03 00  00 00 00 00
-*/
-
-static void zte_ev_usb_serial_close(struct usb_serial_port *port)
-{
-	struct usb_device *udev = port->serial->dev;
-	struct device *dev = &port->dev;
-	int result = 0;
-	int len;
-	unsigned char *buf;
-
-	buf = kmalloc(MAX_SETUP_DATA_SIZE, GFP_KERNEL);
-	if (!buf)
-		return;
-
-	/* send 1st ctl cmd(CTL    21 22 02 00  00 00 00 00) */
-	len = 0;
-	result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
-				 0x22, 0x21,
-				 0x0002, 0x0000, NULL, len,
-				 USB_CTRL_GET_TIMEOUT);
-	dev_dbg(dev, "result = %d\n", result);
-
-	/* send 2st ctl cmd(CTL    21 22 03 00  00 00 00 00 ) */
-	len = 0;
-	result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
-				 0x22, 0x21,
-				 0x0003, 0x0000, NULL, len,
-				 USB_CTRL_GET_TIMEOUT);
-	dev_dbg(dev, "result = %d\n", result);
-
-	/* send  3st cmd and recieve data */
-	/*
-	 * 16.0  CTL    a1 21 00 00  00 00 07 00      CLASS         25.1.0(5)
-	 * 16.0  DI     00 08 07 00  00 00 08
-	 */
-	len = 0x0007;
-	result = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
-				 0x21, 0xa1,
-				 0x0000, 0x0000, buf, len,
-				 USB_CTRL_GET_TIMEOUT);
-	debug_data(dev, __func__, len, buf, result);
-
-	/* send 4th cmd */
-	/*
-	 * 16.0 CTL    21 20 00 00  00 00 07 00      CLASS            30.1.0
-	 * 16.0  DO    00 c2 01 00  00 00 08         .%.....          30.2.0
-	 */
-	len = 0x0007;
-	buf[0] = 0x00;
-	buf[1] = 0xc2;
-	buf[2] = 0x01;
-	buf[3] = 0x00;
-	buf[4] = 0x00;
-	buf[5] = 0x00;
-	buf[6] = 0x08;
-	result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
-				 0x20, 0x21,
-				 0x0000, 0x0000, buf, len,
-				 USB_CTRL_GET_TIMEOUT);
-	debug_data(dev, __func__, len, buf, result);
-
-	/* send 5th cmd */
-	/*
-	 * 16.0 CTL    21 22 03 00  00 00 00 00
-	 */
-	len = 0;
-	result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
-				 0x22, 0x21,
-				 0x0003, 0x0000, NULL, len,
-				 USB_CTRL_GET_TIMEOUT);
-	dev_dbg(dev, "result = %d\n", result);
-
-	/* send 6th cmd */
-	/*
-	 * 16.0  CTL    a1 21 00 00  00 00 07 00        CLASS          33.1.0
-	 * 16.0  DI     00 c2 01 00  00 00 08
-	 */
-	len = 0x0007;
-	result = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
-				 0x21, 0xa1,
-				 0x0000, 0x0000, buf, len,
-				 USB_CTRL_GET_TIMEOUT);
-	debug_data(dev, __func__, len, buf, result);
-
-	/* send 7th cmd */
-	/*
-	 * 16.0  CTL    21 20 00 00  00 00 07 00  CLASS               354.1.0
-	 * 16.0  DO     00 c2 01 00  00 00 08     .......             354.2.0
-	 */
-	len = 0x0007;
-	buf[0] = 0x00;
-	buf[1] = 0xc2;
-	buf[2] = 0x01;
-	buf[3] = 0x00;
-	buf[4] = 0x00;
-	buf[5] = 0x00;
-	buf[6] = 0x08;
-	result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
-				 0x20, 0x21,
-				 0x0000, 0x0000, buf, len,
-				 USB_CTRL_GET_TIMEOUT);
-	debug_data(dev, __func__, len, buf, result);
-
-	/* send 8th cmd */
-	/*
-	 * 16.0 CTL    21 22 03 00  00 00 00 00
-	 */
-	len = 0;
-	result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
-				 0x22, 0x21,
-				 0x0003, 0x0000, NULL, len,
-				 USB_CTRL_GET_TIMEOUT);
-	dev_dbg(dev, "result = %d\n", result);
-
-	kfree(buf);
-
-	usb_serial_generic_close(port);
-}
-
-static const struct usb_device_id id_table[] = {
-	{ USB_DEVICE(0x19d2, 0xffec) },
-	{ USB_DEVICE(0x19d2, 0xffee) },
-	{ USB_DEVICE(0x19d2, 0xfff6) },
-	{ USB_DEVICE(0x19d2, 0xfff7) },
-	{ USB_DEVICE(0x19d2, 0xfff8) },
-	{ USB_DEVICE(0x19d2, 0xfff9) },
-	{ USB_DEVICE(0x19d2, 0xfffb) },
-	{ USB_DEVICE(0x19d2, 0xfffc) },
-	/* MG880 */
-	{ USB_DEVICE(0x19d2, 0xfffd) },
-	{ },
-};
-MODULE_DEVICE_TABLE(usb, id_table);
-
-static struct usb_serial_driver zio_device = {
-	.driver = {
-		.owner =	THIS_MODULE,
-		.name =		"zte_ev",
-	},
-	.id_table =		id_table,
-	.num_ports =		1,
-	.open =			zte_ev_usb_serial_open,
-	.close =		zte_ev_usb_serial_close,
-};
-
-static struct usb_serial_driver * const serial_drivers[] = {
-	&zio_device, NULL
-};
-
-module_usb_serial_driver(serial_drivers, id_table);
-MODULE_LICENSE("GPL v2");