USB: serial: add qualcomm wireless modem driver

Driver originally written by Qualcomm, but rewritten by me due to the
totally different coding style.  Cleaned up the probe logic to make a
bit more sense, this is one wierd device.  They could have prevented all
of this by just writing sane firmware for the modem.

Cc: Tamm Liu <tamml@qualcomm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 155 insertions, 0 deletions

diff --git a/drivers/usb/serial/Kconfig b/drivers/usb/serial/Kconfig
index dbc0781a4163..4afe73e8ec4a 100644
--- a/drivers/usb/serial/Kconfig
+++ b/drivers/usb/serial/Kconfig
@@ -472,6 +472,15 @@ config USB_SERIAL_OTI6858
           To compile this driver as a module, choose M here: the
           module will be called oti6858.
 
+config USB_SERIAL_QUALCOMM
+        tristate "USB Qualcomm Serial modem"
+        help
+          Say Y here if you have a Qualcomm USB modem device.  These are
+          usually wireless cellular modems.
+
+          To compile this driver as a module, choose M here: the
+          module will be called qcserial.
+
 config USB_SERIAL_SPCP8X5
         tristate "USB SPCP8x5 USB To Serial Driver"
         help
diff --git a/drivers/usb/serial/Makefile b/drivers/usb/serial/Makefile
index 222939739ffe..94043babe1d3 100644
--- a/drivers/usb/serial/Makefile
+++ b/drivers/usb/serial/Makefile
@@ -45,6 +45,7 @@ obj-$(CONFIG_USB_SERIAL_OPTICON)		+= opticon.o
 obj-$(CONFIG_USB_SERIAL_OPTION)                 += option.o
 obj-$(CONFIG_USB_SERIAL_OTI6858)                += oti6858.o
 obj-$(CONFIG_USB_SERIAL_PL2303)                 += pl2303.o
+obj-$(CONFIG_USB_SERIAL_QUALCOMM)               += qcserial.o
 obj-$(CONFIG_USB_SERIAL_SAFE)                   += safe_serial.o
 obj-$(CONFIG_USB_SERIAL_SIEMENS_MPI)            += siemens_mpi.o
 obj-$(CONFIG_USB_SERIAL_SIERRAWIRELESS)         += sierra.o
diff --git a/drivers/usb/serial/qcserial.c b/drivers/usb/serial/qcserial.c
new file mode 100644
index 000000000000..6c6add50feaa
--- /dev/null
+++ b/drivers/usb/serial/qcserial.c
@@ -0,0 +1,145 @@
+/*
+ * Qualcomm Serial USB driver
+ *
+ *      Copyright (c) 2008 QUALCOMM Incorporated.
+ *      Copyright (c) 2009 Greg Kroah-Hartman <gregkh@suse.de>
+ *      Copyright (c) 2009 Novell Inc.
+ *
+ *      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.
+ *
+ */
+
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+
+#define DRIVER_AUTHOR "Qualcomm Inc"
+#define DRIVER_DESC "Qualcomm USB Serial driver"
+
+static int debug;
+
+static struct usb_device_id id_table[] = {
+        {USB_DEVICE(0x05c6, 0x9211)},   /* Acer Gobi QDL device */
+        {USB_DEVICE(0x05c6, 0x9212)},   /* Acer Gobi Modem Device */
+        { }                             /* Terminating entry */
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+static struct usb_driver qcdriver = {
+        .name                   = "qcserial",
+        .probe                  = usb_serial_probe,
+        .disconnect             = usb_serial_disconnect,
+        .id_table               = id_table,
+        .suspend                = usb_serial_suspend,
+        .resume                 = usb_serial_resume,
+        .supports_autosuspend   = true,
+};
+
+static int qcprobe(struct usb_serial *serial, const struct usb_device_id *id)
+{
+        int retval = -ENODEV;
+        __u8 nintf;
+        __u8 ifnum;
+
+        dbg("%s", __func__);
+
+        nintf = serial->dev->actconfig->desc.bNumInterfaces;
+        dbg("Num Interfaces = %d", nintf);
+        ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
+        dbg("This Interface = %d", ifnum);
+
+        switch (nintf) {
+        case 1:
+                /* QDL mode */
+                if (serial->interface->num_altsetting == 2) {
+                        struct usb_host_interface *intf;
+
+                        intf = &serial->interface->altsetting[1];
+                        if (intf->desc.bNumEndpoints == 2) {
+                                if (usb_endpoint_is_bulk_in(&intf->endpoint[0].desc) &&
+                                    usb_endpoint_is_bulk_out(&intf->endpoint[1].desc)) {
+                                        dbg("QDL port found");
+                                        retval = usb_set_interface(serial->dev, ifnum, 1);
+                                        if (retval < 0) {
+                                                dev_err(&serial->dev->dev,
+                                                        "Could not set interface, error %d\n",
+                                                        retval);
+                                                retval = -ENODEV;
+                                        }
+                                        return retval;
+                                }
+                        }
+                }
+                break;
+
+        case 4:
+                /* Composite mode */
+                if (ifnum == 2) {
+                        dbg("Modem port found");
+                        retval = usb_set_interface(serial->dev, ifnum, 0);
+                        if (retval < 0) {
+                                dev_err(&serial->dev->dev,
+                                        "Could not set interface, error %d\n",
+                                        retval);
+                                retval = -ENODEV;
+                        }
+                        return retval;
+                }
+                break;
+
+        default:
+                dev_err(&serial->dev->dev,
+                        "unknown number of interfaces: %d\n", nintf);
+                return -ENODEV;
+        }
+
+        return retval;
+}
+
+static struct usb_serial_driver qcdevice = {
+        .driver = {
+                .owner     = THIS_MODULE,
+                .name      = "qcserial",
+        },
+        .description         = "Qualcomm USB modem",
+        .id_table            = id_table,
+        .usb_driver          = &qcdriver,
+        .num_ports           = 1,
+        .probe               = qcprobe,
+};
+
+static int __init qcinit(void)
+{
+        int retval;
+
+        retval = usb_serial_register(&qcdevice);
+        if (retval)
+                return retval;
+
+        retval = usb_register(&qcdriver);
+        if (retval) {
+                usb_serial_deregister(&qcdevice);
+                return retval;
+        }
+
+        return 0;
+}
+
+static void __exit qcexit(void)
+{
+        usb_deregister(&qcdriver);
+        usb_serial_deregister(&qcdevice);
+}
+
+module_init(qcinit);
+module_exit(qcexit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL v2");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug enabled or not");