USB: Sierra Wireless driver update

The largest feature in this patch is that it adds significant throughput
increase to the Sierra driver and adds support for modem status line
control (e.g. the DTR line). This patch also updates the current sierra.c
driver so that it supports both 3-port Sierra devices and 1-port legacy
devices and removes Sierra's references in other related files (Kconfig and
airprime.c).

Signed-off-by: Kevin Lloyd  <linux@sierrawireless.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 699 insertions, 38 deletions

diff --git a/drivers/usb/serial/Kconfig b/drivers/usb/serial/Kconfig
index 8ca6d3f01e85..9a6ec1b5e3d5 100644
--- a/drivers/usb/serial/Kconfig
+++ b/drivers/usb/serial/Kconfig
@@ -537,8 +537,7 @@ config USB_SERIAL_OPTION
           The USB bus on these cards is not accessible externally.
 
           Supported devices include (some of?) those made by:
-          Option, Huawei, Audiovox, Sierra Wireless, Novatel Wireless, or
-          Anydata.
+          Option, Huawei, Audiovox, Novatel Wireless, or Anydata.
 
           To compile this driver as a module, choose M here: the
           module will be called option.
diff --git a/drivers/usb/serial/airprime.c b/drivers/usb/serial/airprime.c
index ba93c72cdba0..7f5d546da39a 100644
--- a/drivers/usb/serial/airprime.c
+++ b/drivers/usb/serial/airprime.c
@@ -18,11 +18,6 @@
 
 static struct usb_device_id id_table [] = {
         { USB_DEVICE(0x0c88, 0x17da) }, /* Kyocera Wireless KPC650/Passport */
-        { USB_DEVICE(0x0f3d, 0x0112) }, /* AirPrime CDMA Wireless PC Card */
-        { USB_DEVICE(0x1199, 0x0017) }, /* Sierra Wireless EM5625 */
-        { USB_DEVICE(0x1199, 0x0018) }, /* Sierra Wireless MC5720 */
-        { USB_DEVICE(0x1199, 0x0112) }, /* Sierra Wireless Aircard 580 */
-        { USB_DEVICE(0x1199, 0x0218) }, /* Sierra Wireless MC5720 */
         { USB_DEVICE(0x1410, 0x1110) }, /* Novatel Wireless Merlin CDMA */
         { USB_DEVICE(0x1410, 0x1100) }, /* ExpressCard34 Qualcomm 3G CDMA */
         { },
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index d29638daa987..39799d21b855 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -1,21 +1,59 @@
 /*
- * Sierra Wireless CDMA Wireless Serial USB driver
- *
- * Current Copy modified by: Kevin Lloyd <linux@sierrawireless.com>
- * Original Copyright (C) 2005-2006 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.
- */
+  USB Driver for Sierra Wireless
+
+  Copyright (C) 2006  Kevin Lloyd <linux@sierrawireless.com>
+
+  IMPORTANT DISCLAIMER: This driver is not commercially supported by
+  Sierra Wireless. Use at your own risk.
+
+  This driver is free software; you can redistribute it and/or modify
+  it under the terms of Version 2 of the GNU General Public License as
+  published by the Free Software Foundation.
+
+  Portions based on the option driver by Matthias Urlichs <smurf@smurf.noris.de>
+  Whom based his on the Keyspan driver by Hugh Blemings <hugh@blemings.org>
+
+  History:
+*/
+
+#define DRIVER_VERSION "v.1.0.5"
+#define DRIVER_AUTHOR "Kevin Lloyd <linux@sierrawireless.com>"
+#define DRIVER_DESC "USB Driver for Sierra Wireless USB modems"
 
 #include <linux/kernel.h>
-#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/errno.h>
 #include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/module.h>
 #include <linux/usb.h>
 #include <linux/usb/serial.h>
 
+/* Function prototypes */
+static int  sierra_open(struct usb_serial_port *port, struct file *filp);
+static void sierra_close(struct usb_serial_port *port, struct file *filp);
+static int  sierra_startup(struct usb_serial *serial);
+static void sierra_shutdown(struct usb_serial *serial);
+static void sierra_rx_throttle(struct usb_serial_port *port);
+static void sierra_rx_unthrottle(struct usb_serial_port *port);
+static int  sierra_write_room(struct usb_serial_port *port);
+
+static void sierra_instat_callback(struct urb *urb);
+
+static int sierra_write(struct usb_serial_port *port,
+                        const unsigned char *buf, int count);
+
+static int  sierra_chars_in_buffer(struct usb_serial_port *port);
+static int  sierra_ioctl(struct usb_serial_port *port, struct file *file,
+                        unsigned int cmd, unsigned long arg);
+static void sierra_set_termios(struct usb_serial_port *port,
+                                struct termios *old);
+static void sierra_break_ctl(struct usb_serial_port *port, int break_state);
+static int  sierra_tiocmget(struct usb_serial_port *port, struct file *file);
+static int  sierra_tiocmset(struct usb_serial_port *port, struct file *file,
+                                unsigned int set, unsigned int clear);
+static int  sierra_send_setup(struct usb_serial_port *port);
+
 static struct usb_device_id id_table [] = {
         { USB_DEVICE(0x1199, 0x0018) }, /* Sierra Wireless MC5720 */
         { USB_DEVICE(0x1199, 0x0020) }, /* Sierra Wireless MC5725 */
@@ -25,51 +63,680 @@ static struct usb_device_id id_table [] = {
         { USB_DEVICE(0x1199, 0x6803) }, /* Sierra Wireless MC8765 */
         { USB_DEVICE(0x1199, 0x6812) }, /* Sierra Wireless MC8775 */
         { USB_DEVICE(0x1199, 0x6820) }, /* Sierra Wireless AirCard 875 */
-        /* Following devices are supported in the airprime.c driver */
-        /* { USB_DEVICE(0x1199, 0x0112) }, */   /* Sierra Wireless AirCard 580 */
-        /* { USB_DEVICE(0x0F3D, 0x0112) }, */   /* AirPrime/Sierra PC 5220 */
+
+        { USB_DEVICE(0x1199, 0x0112) }, /* Sierra Wireless AirCard 580 */
+        { USB_DEVICE(0x0F3D, 0x0112) }, /* AirPrime/Sierra PC 5220 */
+        { }
+};
+
+static struct usb_device_id id_table_1port [] = {
+        { USB_DEVICE(0x1199, 0x0112) }, /* Sierra Wireless AirCard 580 */
+        { USB_DEVICE(0x0F3D, 0x0112) }, /* AirPrime/Sierra PC 5220 */
         { }
 };
+
+static struct usb_device_id id_table_3port [] = {
+        { USB_DEVICE(0x1199, 0x0018) }, /* Sierra Wireless MC5720 */
+        { USB_DEVICE(0x1199, 0x0020) }, /* Sierra Wireless MC5725 */
+        { USB_DEVICE(0x1199, 0x0017) }, /* Sierra Wireless EM5625 */
+        { USB_DEVICE(0x1199, 0x0019) }, /* Sierra Wireless AirCard 595 */
+        { USB_DEVICE(0x1199, 0x6802) }, /* Sierra Wireless MC8755 */
+        { USB_DEVICE(0x1199, 0x6803) }, /* Sierra Wireless MC8765 */
+        { USB_DEVICE(0x1199, 0x6812) }, /* Sierra Wireless MC8775 */
+        { USB_DEVICE(0x1199, 0x6820) }, /* Sierra Wireless AirCard 875 */
+        { }
+};
+
+
 MODULE_DEVICE_TABLE(usb, id_table);
 
 static struct usb_driver sierra_driver = {
-        .name =         "sierra_wireless",
-        .probe =        usb_serial_probe,
-        .disconnect =   usb_serial_disconnect,
-        .id_table =     id_table,
+        .name       = "sierra",
+        .probe      = usb_serial_probe,
+        .disconnect = usb_serial_disconnect,
+        .id_table   = id_table,
+        .no_dynamic_id =        3,
+};
+
+
+//static struct usb_serial_driver *sierra_device;
+
+static struct usb_serial_driver sierra_1port_device = {
+        .driver = {
+                .owner =        THIS_MODULE,
+                .name =         "sierra1",
+        },
+        .description       = "Sierra USB modem (1 port)",
+        .id_table          = id_table_1port,
+        .num_interrupt_in  = NUM_DONT_CARE,
+        .num_bulk_in       = 1,
+        .num_bulk_out      = 1,
+        .num_ports         = 1,
+        .open              = sierra_open,
+        .close             = sierra_close,
+        .write             = sierra_write,
+        .write_room        = sierra_write_room,
+        .chars_in_buffer   = sierra_chars_in_buffer,
+        .throttle          = sierra_rx_throttle,
+        .unthrottle        = sierra_rx_unthrottle,
+        .ioctl             = sierra_ioctl,
+        .set_termios       = sierra_set_termios,
+        .break_ctl         = sierra_break_ctl,
+        .tiocmget          = sierra_tiocmget,
+        .tiocmset          = sierra_tiocmset,
+        .attach            = sierra_startup,
+        .shutdown          = sierra_shutdown,
+        .read_int_callback = sierra_instat_callback,
 };
 
-static struct usb_serial_driver sierra_device = {
+static struct usb_serial_driver sierra_3port_device = {
         .driver = {
-        .owner =                THIS_MODULE,
-        .name =                 "Sierra_Wireless",
+                .owner =        THIS_MODULE,
+                .name =         "sierra3",
         },
-        .id_table =             id_table,
-        .num_interrupt_in =     NUM_DONT_CARE,
-        .num_bulk_in =          NUM_DONT_CARE,
-        .num_bulk_out =         NUM_DONT_CARE,
-        .num_ports =            3,
+        .description       = "Sierra USB modem (3 port)",
+        .id_table          = id_table_3port,
+        .num_interrupt_in  = NUM_DONT_CARE,
+        .num_bulk_in       = 3,
+        .num_bulk_out      = 3,
+        .num_ports         = 3,
+        .open              = sierra_open,
+        .close             = sierra_close,
+        .write             = sierra_write,
+        .write_room        = sierra_write_room,
+        .chars_in_buffer   = sierra_chars_in_buffer,
+        .throttle          = sierra_rx_throttle,
+        .unthrottle        = sierra_rx_unthrottle,
+        .ioctl             = sierra_ioctl,
+        .set_termios       = sierra_set_termios,
+        .break_ctl         = sierra_break_ctl,
+        .tiocmget          = sierra_tiocmget,
+        .tiocmset          = sierra_tiocmset,
+        .attach            = sierra_startup,
+        .shutdown          = sierra_shutdown,
+        .read_int_callback = sierra_instat_callback,
 };
 
+#ifdef CONFIG_USB_DEBUG
+static int debug;
+#else
+#define debug 0
+#endif
+
+/* per port private data */
+
+#define N_IN_URB 4
+#define N_OUT_URB 1
+#define IN_BUFLEN 4096
+#define OUT_BUFLEN 128
+
+struct sierra_port_private {
+        /* Input endpoints and buffer for this port */
+        struct urb *in_urbs[N_IN_URB];
+        char in_buffer[N_IN_URB][IN_BUFLEN];
+        /* Output endpoints and buffer for this port */
+        struct urb *out_urbs[N_OUT_URB];
+        char out_buffer[N_OUT_URB][OUT_BUFLEN];
+
+        /* Settings for the port */
+        int rts_state;  /* Handshaking pins (outputs) */
+        int dtr_state;
+        int cts_state;  /* Handshaking pins (inputs) */
+        int dsr_state;
+        int dcd_state;
+        int ri_state;
+
+        unsigned long tx_start_time[N_OUT_URB];
+};
+
+/* Functions used by new usb-serial code. */
 static int __init sierra_init(void)
 {
         int retval;
-
-        retval = usb_serial_register(&sierra_device);
+        retval = usb_serial_register(&sierra_1port_device);
+        if (retval)
+                goto failed_1port_device_register;
+        retval = usb_serial_register(&sierra_3port_device);
         if (retval)
-                return retval;
+                goto failed_3port_device_register;
+
+
         retval = usb_register(&sierra_driver);
         if (retval)
-                usb_serial_deregister(&sierra_device);
+                goto failed_driver_register;
+
+        info(DRIVER_DESC ": " DRIVER_VERSION);
+
+        return 0;
+
+failed_driver_register:
+        usb_serial_deregister(&sierra_3port_device);
+failed_3port_device_register:
+        usb_serial_deregister(&sierra_1port_device);
+failed_1port_device_register:
         return retval;
 }
 
 static void __exit sierra_exit(void)
 {
-        usb_deregister(&sierra_driver);
-        usb_serial_deregister(&sierra_device);
+        usb_deregister (&sierra_driver);
+        usb_serial_deregister(&sierra_1port_device);
+        usb_serial_deregister(&sierra_3port_device);
 }
 
 module_init(sierra_init);
 module_exit(sierra_exit);
+
+static void sierra_rx_throttle(struct usb_serial_port *port)
+{
+        dbg("%s", __FUNCTION__);
+}
+
+static void sierra_rx_unthrottle(struct usb_serial_port *port)
+{
+        dbg("%s", __FUNCTION__);
+}
+
+static void sierra_break_ctl(struct usb_serial_port *port, int break_state)
+{
+        /* Unfortunately, I don't know how to send a break */
+        dbg("%s", __FUNCTION__);
+}
+
+static void sierra_set_termios(struct usb_serial_port *port,
+                        struct termios *old_termios)
+{
+        dbg("%s", __FUNCTION__);
+
+        sierra_send_setup(port);
+}
+
+static int sierra_tiocmget(struct usb_serial_port *port, struct file *file)
+{
+        unsigned int value;
+        struct sierra_port_private *portdata;
+
+        portdata = usb_get_serial_port_data(port);
+
+        value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
+                ((portdata->dtr_state) ? TIOCM_DTR : 0) |
+                ((portdata->cts_state) ? TIOCM_CTS : 0) |
+                ((portdata->dsr_state) ? TIOCM_DSR : 0) |
+                ((portdata->dcd_state) ? TIOCM_CAR : 0) |
+                ((portdata->ri_state) ? TIOCM_RNG : 0);
+
+        return value;
+}
+
+static int sierra_tiocmset(struct usb_serial_port *port, struct file *file,
+                        unsigned int set, unsigned int clear)
+{
+        struct sierra_port_private *portdata;
+
+        portdata = usb_get_serial_port_data(port);
+
+        if (set & TIOCM_RTS)
+                portdata->rts_state = 1;
+        if (set & TIOCM_DTR)
+                portdata->dtr_state = 1;
+
+        if (clear & TIOCM_RTS)
+                portdata->rts_state = 0;
+        if (clear & TIOCM_DTR)
+                portdata->dtr_state = 0;
+        return sierra_send_setup(port);
+}
+
+static int sierra_ioctl(struct usb_serial_port *port, struct file *file,
+                        unsigned int cmd, unsigned long arg)
+{
+        return -ENOIOCTLCMD;
+}
+
+/* Write */
+static int sierra_write(struct usb_serial_port *port,
+                        const unsigned char *buf, int count)
+{
+        struct sierra_port_private *portdata;
+        int i;
+        int left, todo;
+        struct urb *this_urb = NULL; /* spurious */
+        int err;
+
+        portdata = usb_get_serial_port_data(port);
+
+        dbg("%s: write (%d chars)", __FUNCTION__, count);
+
+        i = 0;
+        left = count;
+        for (i=0; left > 0 && i < N_OUT_URB; i++) {
+                todo = left;
+                if (todo > OUT_BUFLEN)
+                        todo = OUT_BUFLEN;
+
+                this_urb = portdata->out_urbs[i];
+                if (this_urb->status == -EINPROGRESS) {
+                        if (time_before(jiffies,
+                                        portdata->tx_start_time[i] + 10 * HZ))
+                                continue;
+                        usb_unlink_urb(this_urb);
+                        continue;
+                }
+                if (this_urb->status != 0)
+                        dbg("usb_write %p failed (err=%d)",
+                                this_urb, this_urb->status);
+
+                dbg("%s: endpoint %d buf %d", __FUNCTION__,
+                        usb_pipeendpoint(this_urb->pipe), i);
+
+                /* send the data */
+                memcpy (this_urb->transfer_buffer, buf, todo);
+                this_urb->transfer_buffer_length = todo;
+
+                this_urb->dev = port->serial->dev;
+                err = usb_submit_urb(this_urb, GFP_ATOMIC);
+                if (err) {
+                        dbg("usb_submit_urb %p (write bulk) failed "
+                                "(%d, has %d)", this_urb,
+                                err, this_urb->status);
+                        continue;
+                }
+                portdata->tx_start_time[i] = jiffies;
+                buf += todo;
+                left -= todo;
+        }
+
+        count -= left;
+        dbg("%s: wrote (did %d)", __FUNCTION__, count);
+        return count;
+}
+
+static void sierra_indat_callback(struct urb *urb)
+{
+        int err;
+        int endpoint;
+        struct usb_serial_port *port;
+        struct tty_struct *tty;
+        unsigned char *data = urb->transfer_buffer;
+
+        dbg("%s: %p", __FUNCTION__, urb);
+
+        endpoint = usb_pipeendpoint(urb->pipe);
+        port = (struct usb_serial_port *) urb->context;
+
+        if (urb->status) {
+                dbg("%s: nonzero status: %d on endpoint %02x.",
+                    __FUNCTION__, urb->status, endpoint);
+        } else {
+                tty = port->tty;
+                if (urb->actual_length) {
+                        tty_buffer_request_room(tty, urb->actual_length);
+                        tty_insert_flip_string(tty, data, urb->actual_length);
+                        tty_flip_buffer_push(tty);
+                } else {
+                        dbg("%s: empty read urb received", __FUNCTION__);
+                }
+
+                /* Resubmit urb so we continue receiving */
+                if (port->open_count && urb->status != -ESHUTDOWN) {
+                        err = usb_submit_urb(urb, GFP_ATOMIC);
+                        if (err)
+                                printk(KERN_ERR "%s: resubmit read urb failed. "
+                                        "(%d)", __FUNCTION__, err);
+                }
+        }
+        return;
+}
+
+static void sierra_outdat_callback(struct urb *urb)
+{
+        struct usb_serial_port *port;
+
+        dbg("%s", __FUNCTION__);
+
+        port = (struct usb_serial_port *) urb->context;
+
+        usb_serial_port_softint(port);
+}
+
+static void sierra_instat_callback(struct urb *urb)
+{
+        int err;
+        struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
+        struct sierra_port_private *portdata = usb_get_serial_port_data(port);
+        struct usb_serial *serial = port->serial;
+
+        dbg("%s", __FUNCTION__);
+        dbg("%s: urb %p port %p has data %p", __FUNCTION__,urb,port,portdata);
+
+        if (urb->status == 0) {
+                struct usb_ctrlrequest *req_pkt =
+                                (struct usb_ctrlrequest *)urb->transfer_buffer;
+
+                if (!req_pkt) {
+                        dbg("%s: NULL req_pkt\n", __FUNCTION__);
+                        return;
+                }
+                if ((req_pkt->bRequestType == 0xA1) &&
+                                (req_pkt->bRequest == 0x20)) {
+                        int old_dcd_state;
+                        unsigned char signals = *((unsigned char *)
+                                        urb->transfer_buffer +
+                                        sizeof(struct usb_ctrlrequest));
+
+                        dbg("%s: signal x%x", __FUNCTION__, signals);
+
+                        old_dcd_state = portdata->dcd_state;
+                        portdata->cts_state = 1;
+                        portdata->dcd_state = ((signals & 0x01) ? 1 : 0);
+                        portdata->dsr_state = ((signals & 0x02) ? 1 : 0);
+                        portdata->ri_state = ((signals & 0x08) ? 1 : 0);
+
+                        if (port->tty && !C_CLOCAL(port->tty) &&
+                                        old_dcd_state && !portdata->dcd_state)
+                                tty_hangup(port->tty);
+                } else {
+                        dbg("%s: type %x req %x", __FUNCTION__,
+                                req_pkt->bRequestType,req_pkt->bRequest);
+                }
+        } else
+                dbg("%s: error %d", __FUNCTION__, urb->status);
+
+        /* Resubmit urb so we continue receiving IRQ data */
+        if (urb->status != -ESHUTDOWN) {
+                urb->dev = serial->dev;
+                err = usb_submit_urb(urb, GFP_ATOMIC);
+                if (err)
+                        dbg("%s: resubmit intr urb failed. (%d)",
+                                __FUNCTION__, err);
+        }
+}
+
+static int sierra_write_room(struct usb_serial_port *port)
+{
+        struct sierra_port_private *portdata;
+        int i;
+        int data_len = 0;
+        struct urb *this_urb;
+
+        portdata = usb_get_serial_port_data(port);
+
+        for (i=0; i < N_OUT_URB; i++) {
+                this_urb = portdata->out_urbs[i];
+                if (this_urb && this_urb->status != -EINPROGRESS)
+                        data_len += OUT_BUFLEN;
+        }
+
+        dbg("%s: %d", __FUNCTION__, data_len);
+        return data_len;
+}
+
+static int sierra_chars_in_buffer(struct usb_serial_port *port)
+{
+        struct sierra_port_private *portdata;
+        int i;
+        int data_len = 0;
+        struct urb *this_urb;
+
+        portdata = usb_get_serial_port_data(port);
+
+        for (i=0; i < N_OUT_URB; i++) {
+                this_urb = portdata->out_urbs[i];
+                if (this_urb && this_urb->status == -EINPROGRESS)
+                        data_len += this_urb->transfer_buffer_length;
+        }
+        dbg("%s: %d", __FUNCTION__, data_len);
+        return data_len;
+}
+
+static int sierra_open(struct usb_serial_port *port, struct file *filp)
+{
+        struct sierra_port_private *portdata;
+        struct usb_serial *serial = port->serial;
+        int i, err;
+        struct urb *urb;
+
+        portdata = usb_get_serial_port_data(port);
+
+        dbg("%s", __FUNCTION__);
+
+        /* Set some sane defaults */
+        portdata->rts_state = 1;
+        portdata->dtr_state = 1;
+
+        /* Reset low level data toggle and start reading from endpoints */
+        for (i = 0; i < N_IN_URB; i++) {
+                urb = portdata->in_urbs[i];
+                if (! urb)
+                        continue;
+                if (urb->dev != serial->dev) {
+                        dbg("%s: dev %p != %p", __FUNCTION__,
+                                urb->dev, serial->dev);
+                        continue;
+                }
+
+                /*
+                 * make sure endpoint data toggle is synchronized with the
+                 * device
+                 */
+                usb_clear_halt(urb->dev, urb->pipe);
+
+                err = usb_submit_urb(urb, GFP_KERNEL);
+                if (err) {
+                        dbg("%s: submit urb %d failed (%d) %d",
+                                __FUNCTION__, i, err,
+                                urb->transfer_buffer_length);
+                }
+        }
+
+        /* Reset low level data toggle on out endpoints */
+        for (i = 0; i < N_OUT_URB; i++) {
+                urb = portdata->out_urbs[i];
+                if (! urb)
+                        continue;
+                urb->dev = serial->dev;
+                /* usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+                                usb_pipeout(urb->pipe), 0); */
+        }
+
+        port->tty->low_latency = 1;
+
+        sierra_send_setup(port);
+
+        return (0);
+}
+
+static inline void stop_urb(struct urb *urb)
+{
+        if (urb && urb->status == -EINPROGRESS)
+                usb_kill_urb(urb);
+}
+
+static void sierra_close(struct usb_serial_port *port, struct file *filp)
+{
+        int i;
+        struct usb_serial *serial = port->serial;
+        struct sierra_port_private *portdata;
+
+        dbg("%s", __FUNCTION__);
+        portdata = usb_get_serial_port_data(port);
+
+        portdata->rts_state = 0;
+        portdata->dtr_state = 0;
+
+        if (serial->dev) {
+                sierra_send_setup(port);
+
+                /* Stop reading/writing urbs */
+                for (i = 0; i < N_IN_URB; i++)
+                        stop_urb(portdata->in_urbs[i]);
+                for (i = 0; i < N_OUT_URB; i++)
+                        stop_urb(portdata->out_urbs[i]);
+        }
+        port->tty = NULL;
+}
+
+/* Helper functions used by sierra_setup_urbs */
+static struct urb *sierra_setup_urb(struct usb_serial *serial, int endpoint,
+                int dir, void *ctx, char *buf, int len,
+                void (*callback)(struct urb *))
+{
+        struct urb *urb;
+
+        if (endpoint == -1)
+                return NULL;            /* endpoint not needed */
+
+        urb = usb_alloc_urb(0, GFP_KERNEL);             /* No ISO */
+        if (urb == NULL) {
+                dbg("%s: alloc for endpoint %d failed.", __FUNCTION__, endpoint);
+                return NULL;
+        }
+
+                /* Fill URB using supplied data. */
+        usb_fill_bulk_urb(urb, serial->dev,
+                      usb_sndbulkpipe(serial->dev, endpoint) | dir,
+                      buf, len, callback, ctx);
+
+        return urb;
+}
+
+/* Setup urbs */
+static void sierra_setup_urbs(struct usb_serial *serial)
+{
+        int i,j;
+        struct usb_serial_port *port;
+        struct sierra_port_private *portdata;
+
+        dbg("%s", __FUNCTION__);
+
+        for (i = 0; i < serial->num_ports; i++) {
+                port = serial->port[i];
+                portdata = usb_get_serial_port_data(port);
+
+        /* Do indat endpoints first */
+                for (j = 0; j < N_IN_URB; ++j) {
+                        portdata->in_urbs[j] = sierra_setup_urb (serial,
+                        port->bulk_in_endpointAddress, USB_DIR_IN, port,
+                        portdata->in_buffer[j], IN_BUFLEN, sierra_indat_callback);
+                }
+
+                /* outdat endpoints */
+                for (j = 0; j < N_OUT_URB; ++j) {
+                        portdata->out_urbs[j] = sierra_setup_urb (serial,
+                        port->bulk_out_endpointAddress, USB_DIR_OUT, port,
+                        portdata->out_buffer[j], OUT_BUFLEN, sierra_outdat_callback);
+                }
+        }
+}
+
+static int sierra_send_setup(struct usb_serial_port *port)
+{
+        struct usb_serial *serial = port->serial;
+        struct sierra_port_private *portdata;
+
+        dbg("%s", __FUNCTION__);
+
+        portdata = usb_get_serial_port_data(port);
+
+        if (port->tty) {
+                int val = 0;
+                if (portdata->dtr_state)
+                        val |= 0x01;
+                if (portdata->rts_state)
+                        val |= 0x02;
+
+                return usb_control_msg(serial->dev,
+                                usb_rcvctrlpipe(serial->dev, 0),
+                                0x22,0x21,val,0,NULL,0,USB_CTRL_SET_TIMEOUT);
+        }
+
+        return 0;
+}
+
+static int sierra_startup(struct usb_serial *serial)
+{
+        int i, err;
+        struct usb_serial_port *port;
+        struct sierra_port_private *portdata;
+
+        dbg("%s", __FUNCTION__);
+
+        /* Now setup per port private data */
+        for (i = 0; i < serial->num_ports; i++) {
+                port = serial->port[i];
+                portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
+                if (!portdata) {
+                        dbg("%s: kmalloc for sierra_port_private (%d) failed!.",
+                                        __FUNCTION__, i);
+                        return (1);
+                }
+
+                usb_set_serial_port_data(port, portdata);
+
+                if (! port->interrupt_in_urb)
+                        continue;
+                err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
+                if (err)
+                        dbg("%s: submit irq_in urb failed %d",
+                                __FUNCTION__, err);
+        }
+
+        sierra_setup_urbs(serial);
+
+        return (0);
+}
+
+static void sierra_shutdown(struct usb_serial *serial)
+{
+        int i, j;
+        struct usb_serial_port *port;
+        struct sierra_port_private *portdata;
+
+        dbg("%s", __FUNCTION__);
+
+        /* Stop reading/writing urbs */
+        for (i = 0; i < serial->num_ports; ++i) {
+                port = serial->port[i];
+                portdata = usb_get_serial_port_data(port);
+                for (j = 0; j < N_IN_URB; j++)
+                        stop_urb(portdata->in_urbs[j]);
+                for (j = 0; j < N_OUT_URB; j++)
+                        stop_urb(portdata->out_urbs[j]);
+        }
+
+        /* Now free them */
+        for (i = 0; i < serial->num_ports; ++i) {
+                port = serial->port[i];
+                portdata = usb_get_serial_port_data(port);
+
+                for (j = 0; j < N_IN_URB; j++) {
+                        if (portdata->in_urbs[j]) {
+                                usb_free_urb(portdata->in_urbs[j]);
+                                portdata->in_urbs[j] = NULL;
+                        }
+                }
+                for (j = 0; j < N_OUT_URB; j++) {
+                        if (portdata->out_urbs[j]) {
+                                usb_free_urb(portdata->out_urbs[j]);
+                                portdata->out_urbs[j] = NULL;
+                        }
+                }
+        }
+
+        /* Now free per port private data */
+        for (i = 0; i < serial->num_ports; i++) {
+                port = serial->port[i];
+                kfree(usb_get_serial_port_data(port));
+        }
+}
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_VERSION(DRIVER_VERSION);
 MODULE_LICENSE("GPL");
+
+#ifdef CONFIG_USB_DEBUG
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug messages");
+#endif
+