drivers/usb/serial/airprime.c

   1 /*
   2  * AirPrime CDMA Wireless Serial USB driver
   3  *
   4  * Copyright (C) 2005-2006 Greg Kroah-Hartman <gregkh@suse.de>
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License version
   8  *      2 as published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/tty.h>
  14 #include <linux/tty_flip.h>
  15 #include <linux/module.h>
  16 #include <linux/usb.h>
  17 #include <linux/usb/serial.h>
  18
  19 static struct usb_device_id id_table [] = {
  20         { USB_DEVICE(0x0c88, 0x17da) }, /* Kyocera Wireless KPC650/Passport */
  21         { USB_DEVICE(0x1410, 0x1110) }, /* Novatel Wireless Merlin CDMA */
  22         { USB_DEVICE(0x1410, 0x1130) }, /* Novatel Wireless S720 CDMA/EV-DO */
  23         { USB_DEVICE(0x1410, 0x2110) }, /* Novatel Wireless U720 CDMA/EV-DO */
  24         { USB_DEVICE(0x1410, 0x1430) }, /* Novatel Merlin XU870 HSDPA/3G */
  25         { USB_DEVICE(0x1410, 0x1100) }, /* ExpressCard34 Qualcomm 3G CDMA */
  26         { USB_DEVICE(0x413c, 0x8115) }, /* Dell Wireless HSDPA 5500 */
  27         { },
  28 };
  29 MODULE_DEVICE_TABLE(usb, id_table);
  30
  31 #define URB_TRANSFER_BUFFER_SIZE        4096
  32 #define NUM_READ_URBS                   4
  33 #define NUM_WRITE_URBS                  4
  34 #define NUM_BULK_EPS                    3
  35 #define MAX_BULK_EPS                    6
  36
  37 /* if overridden by the user, then use their value for the size of the
  38  * read and write urbs, and the number of endpoints */
  39 static int buffer_size = URB_TRANSFER_BUFFER_SIZE;
  40 static int endpoints = NUM_BULK_EPS;
  41 static int debug;
  42 struct airprime_private {
  43         spinlock_t lock;
  44         int outstanding_urbs;
  45         int throttled;
  46         struct urb *read_urbp[NUM_READ_URBS];
  47 };
  48
  49 static void airprime_read_bulk_callback(struct urb *urb)
  50 {
  51         struct usb_serial_port *port = urb->context;
  52         unsigned char *data = urb->transfer_buffer;
  53         struct tty_struct *tty;
  54         int result;
  55
  56         dbg("%s - port %d", __FUNCTION__, port->number);
  57
  58         if (urb->status) {
  59                 dbg("%s - nonzero read bulk status received: %d",
  60                     __FUNCTION__, urb->status);
  61                 return;
  62         }
  63         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
  64
  65         tty = port->tty;
  66         if (tty && urb->actual_length) {
  67                 tty_insert_flip_string (tty, data, urb->actual_length);
  68                 tty_flip_buffer_push (tty);
  69         }
  70
  71         result = usb_submit_urb (urb, GFP_ATOMIC);
  72         if (result)
  73                 dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n",
  74                         __FUNCTION__, result);
  75         return;
  76 }
  77
  78 static void airprime_write_bulk_callback(struct urb *urb)
  79 {
  80         struct usb_serial_port *port = urb->context;
  81         struct airprime_private *priv = usb_get_serial_port_data(port);
  82         unsigned long flags;
  83
  84         dbg("%s - port %d", __FUNCTION__, port->number);
  85
  86         /* free up the transfer buffer, as usb_free_urb() does not do this */
  87         kfree (urb->transfer_buffer);
  88
  89         if (urb->status)
  90                 dbg("%s - nonzero write bulk status received: %d",
  91                     __FUNCTION__, urb->status);
  92         spin_lock_irqsave(&priv->lock, flags);
  93         --priv->outstanding_urbs;
  94         spin_unlock_irqrestore(&priv->lock, flags);
  95
  96         usb_serial_port_softint(port);
  97 }
  98
  99 static int airprime_open(struct usb_serial_port *port, struct file *filp)
 100 {
 101         struct airprime_private *priv = usb_get_serial_port_data(port);
 102         struct usb_serial *serial = port->serial;
 103         struct urb *urb;
 104         char *buffer = NULL;
 105         int i;
 106         int result = 0;
 107
 108         dbg("%s - port %d", __FUNCTION__, port->number);
 109
 110         /* initialize our private data structure if it isn't already created */
 111         if (!priv) {
 112                 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 113                 if (!priv) {
 114                         result = -ENOMEM;
 115                         goto out;
 116                 }
 117                 spin_lock_init(&priv->lock);
 118                 usb_set_serial_port_data(port, priv);
 119         }
 120
 121         for (i = 0; i < NUM_READ_URBS; ++i) {
 122                 buffer = kmalloc(buffer_size, GFP_KERNEL);
 123                 if (!buffer) {
 124                         dev_err(&port->dev, "%s - out of memory.\n",
 125                                 __FUNCTION__);
 126                         result = -ENOMEM;
 127                         goto errout;
 128                 }
 129                 urb = usb_alloc_urb(0, GFP_KERNEL);
 130                 if (!urb) {
 131                         kfree(buffer);
 132                         dev_err(&port->dev, "%s - no more urbs?\n",
 133                                 __FUNCTION__);
 134                         result = -ENOMEM;
 135                         goto errout;
 136                 }
 137                 usb_fill_bulk_urb(urb, serial->dev,
 138                                   usb_rcvbulkpipe(serial->dev,
 139                                                   port->bulk_out_endpointAddress),
 140                                   buffer, buffer_size,
 141                                   airprime_read_bulk_callback, port);
 142                 result = usb_submit_urb(urb, GFP_KERNEL);
 143                 if (result) {
 144                         usb_free_urb(urb);
 145                         kfree(buffer);
 146                         dev_err(&port->dev,
 147                                 "%s - failed submitting read urb %d for port %d, error %d\n",
 148                                 __FUNCTION__, i, port->number, result);
 149                         goto errout;
 150                 }
 151                 /* remember this urb so we can kill it when the port is closed */
 152                 priv->read_urbp[i] = urb;
 153         }
 154         goto out;
 155
 156  errout:
 157         /* some error happened, cancel any submitted urbs and clean up anything that
 158            got allocated successfully */
 159
 160         while (i-- != 0) {
 161                 urb = priv->read_urbp[i];
 162                 buffer = urb->transfer_buffer;
 163                 usb_kill_urb (urb);
 164                 usb_free_urb (urb);
 165                 kfree (buffer);
 166         }
 167
 168  out:
 169         return result;
 170 }
 171
 172 static void airprime_close(struct usb_serial_port *port, struct file * filp)
 173 {
 174         struct airprime_private *priv = usb_get_serial_port_data(port);
 175         int i;
 176
 177         dbg("%s - port %d", __FUNCTION__, port->number);
 178
 179         for (i = 0; i < NUM_READ_URBS; ++i) {
 180                 usb_kill_urb (priv->read_urbp[i]);
 181                 kfree (priv->read_urbp[i]->transfer_buffer);
 182                 usb_free_urb (priv->read_urbp[i]);
 183         }
 184
 185         /* free up private structure */
 186         kfree (priv);
 187         usb_set_serial_port_data(port, NULL);
 188 }
 189
 190 static int airprime_write(struct usb_serial_port *port,
 191                           const unsigned char *buf, int count)
 192 {
 193         struct airprime_private *priv = usb_get_serial_port_data(port);
 194         struct usb_serial *serial = port->serial;
 195         struct urb *urb;
 196         unsigned char *buffer;
 197         unsigned long flags;
 198         int status;
 199         dbg("%s - port %d", __FUNCTION__, port->number);
 200
 201         spin_lock_irqsave(&priv->lock, flags);
 202         if (priv->outstanding_urbs > NUM_WRITE_URBS) {
 203                 spin_unlock_irqrestore(&priv->lock, flags);
 204                 dbg("%s - write limit hit\n", __FUNCTION__);
 205                 return 0;
 206         }
 207         spin_unlock_irqrestore(&priv->lock, flags);
 208         buffer = kmalloc(count, GFP_ATOMIC);
 209         if (!buffer) {
 210                 dev_err(&port->dev, "out of memory\n");
 211                 return -ENOMEM;
 212         }
 213         urb = usb_alloc_urb(0, GFP_ATOMIC);
 214         if (!urb) {
 215                 dev_err(&port->dev, "no more free urbs\n");
 216                 kfree (buffer);
 217                 return -ENOMEM;
 218         }
 219         memcpy (buffer, buf, count);
 220
 221         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, buffer);
 222
 223         usb_fill_bulk_urb(urb, serial->dev,
 224                           usb_sndbulkpipe(serial->dev,
 225                                           port->bulk_out_endpointAddress),
 226                           buffer, count,
 227                           airprime_write_bulk_callback, port);
 228
 229         /* send it down the pipe */
 230         status = usb_submit_urb(urb, GFP_ATOMIC);
 231         if (status) {
 232                 dev_err(&port->dev,
 233                         "%s - usb_submit_urb(write bulk) failed with status = %d\n",
 234                         __FUNCTION__, status);
 235                 count = status;
 236                 kfree (buffer);
 237         } else {
 238                 spin_lock_irqsave(&priv->lock, flags);
 239                 ++priv->outstanding_urbs;
 240                 spin_unlock_irqrestore(&priv->lock, flags);
 241         }
 242         /* we are done with this urb, so let the host driver
 243          * really free it when it is finished with it */
 244         usb_free_urb (urb);
 245         return count;
 246 }
 247
 248 static struct usb_driver airprime_driver = {
 249         .name =         "airprime",
 250         .probe =        usb_serial_probe,
 251         .disconnect =   usb_serial_disconnect,
 252         .id_table =     id_table,
 253         .no_dynamic_id =        1,
 254 };
 255
 256 static struct usb_serial_driver airprime_device = {
 257         .driver = {
 258                 .owner =        THIS_MODULE,
 259                 .name =         "airprime",
 260         },
 261         .usb_driver =           &airprime_driver,
 262         .id_table =             id_table,
 263         .num_interrupt_in =     NUM_DONT_CARE,
 264         .num_bulk_in =          NUM_DONT_CARE,
 265         .num_bulk_out =         NUM_DONT_CARE,
 266         .open =                 airprime_open,
 267         .close =                airprime_close,
 268         .write =                airprime_write,
 269 };
 270
 271 static int __init airprime_init(void)
 272 {
 273         int retval;
 274
 275         airprime_device.num_ports =
 276                 (endpoints > 0 && endpoints <= MAX_BULK_EPS) ? endpoints : NUM_BULK_EPS;
 277         retval = usb_serial_register(&airprime_device);
 278         if (retval)
 279                 return retval;
 280         retval = usb_register(&airprime_driver);
 281         if (retval)
 282                 usb_serial_deregister(&airprime_device);
 283         return retval;
 284 }
 285
 286 static void __exit airprime_exit(void)
 287 {
 288         dbg("%s", __FUNCTION__);
 289
 290         usb_deregister(&airprime_driver);
 291         usb_serial_deregister(&airprime_device);
 292 }
 293
 294 module_init(airprime_init);
 295 module_exit(airprime_exit);
 296 MODULE_LICENSE("GPL");
 297
 298 module_param(debug, bool, S_IRUGO | S_IWUSR);
 299 MODULE_PARM_DESC(debug, "Debug enabled");
 300 module_param(buffer_size, int, 0);
 301 MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers in bytes (default 4096)");
 302 module_param(endpoints, int, 0);
 303 MODULE_PARM_DESC(endpoints, "Number of bulk EPs to configure (default 3)");