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                 /* something happened, so free up the memory for this urb */
  62                 if (urb->transfer_buffer) {
  63                         kfree (urb->transfer_buffer);
  64                         urb->transfer_buffer = NULL;
  65                 }
  66                 return;
  67         }
  68         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
  69
  70         tty = port->tty;
  71         if (tty && urb->actual_length) {
  72                 tty_insert_flip_string (tty, data, urb->actual_length);
  73                 tty_flip_buffer_push (tty);
  74         }
  75
  76         result = usb_submit_urb (urb, GFP_ATOMIC);
  77         if (result)
  78                 dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n",
  79                         __FUNCTION__, result);
  80         return;
  81 }
  82
  83 static void airprime_write_bulk_callback(struct urb *urb)
  84 {
  85         struct usb_serial_port *port = urb->context;
  86         struct airprime_private *priv = usb_get_serial_port_data(port);
  87         unsigned long flags;
  88
  89         dbg("%s - port %d", __FUNCTION__, port->number);
  90
  91         /* free up the transfer buffer, as usb_free_urb() does not do this */
  92         kfree (urb->transfer_buffer);
  93
  94         if (urb->status)
  95                 dbg("%s - nonzero write bulk status received: %d",
  96                     __FUNCTION__, urb->status);
  97         spin_lock_irqsave(&priv->lock, flags);
  98         --priv->outstanding_urbs;
  99         spin_unlock_irqrestore(&priv->lock, flags);
 100
 101         usb_serial_port_softint(port);
 102 }
 103
 104 static int airprime_open(struct usb_serial_port *port, struct file *filp)
 105 {
 106         struct airprime_private *priv = usb_get_serial_port_data(port);
 107         struct usb_serial *serial = port->serial;
 108         struct urb *urb;
 109         char *buffer = NULL;
 110         int i;
 111         int result = 0;
 112
 113         dbg("%s - port %d", __FUNCTION__, port->number);
 114
 115         /* initialize our private data structure if it isn't already created */
 116         if (!priv) {
 117                 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 118                 if (!priv) {
 119                         result = -ENOMEM;
 120                         goto out;
 121                 }
 122                 spin_lock_init(&priv->lock);
 123                 usb_set_serial_port_data(port, priv);
 124         }
 125
 126         for (i = 0; i < NUM_READ_URBS; ++i) {
 127                 buffer = kmalloc(buffer_size, GFP_KERNEL);
 128                 if (!buffer) {
 129                         dev_err(&port->dev, "%s - out of memory.\n",
 130                                 __FUNCTION__);
 131                         result = -ENOMEM;
 132                         goto errout;
 133                 }
 134                 urb = usb_alloc_urb(0, GFP_KERNEL);
 135                 if (!urb) {
 136                         kfree(buffer);
 137                         dev_err(&port->dev, "%s - no more urbs?\n",
 138                                 __FUNCTION__);
 139                         result = -ENOMEM;
 140                         goto errout;
 141                 }
 142                 usb_fill_bulk_urb(urb, serial->dev,
 143                                   usb_rcvbulkpipe(serial->dev,
 144                                                   port->bulk_out_endpointAddress),
 145                                   buffer, buffer_size,
 146                                   airprime_read_bulk_callback, port);
 147                 result = usb_submit_urb(urb, GFP_KERNEL);
 148                 if (result) {
 149                         dev_err(&port->dev,
 150                                 "%s - failed submitting read urb %d for port %d, error %d\n",
 151                                 __FUNCTION__, i, port->number, result);
 152                         goto errout;
 153                 }
 154                 /* remember this urb so we can kill it when the port is closed */
 155                 priv->read_urbp[i] = urb;
 156         }
 157         goto out;
 158
 159  errout:
 160         /* some error happened, cancel any submitted urbs and clean up anything that
 161            got allocated successfully */
 162
 163         for ( ; i >= 0; --i) {
 164                 urb = priv->read_urbp[i];
 165                 if (urb) {
 166                         /* This urb was submitted successfully. So we have to
 167                            cancel it.
 168                            Unlinking the urb will invoke read_bulk_callback()
 169                            with an error status, so its transfer buffer will
 170                            be freed there */
 171                         if (usb_unlink_urb (urb) != -EINPROGRESS) {
 172                                 /* comments in drivers/usb/core/urb.c say this
 173                                    can only happen if the urb was never submitted,
 174                                    or has completed already.
 175                                    Either way we may have to free the transfer
 176                                    buffer here. */
 177                                 if (urb->transfer_buffer) {
 178                                         kfree (urb->transfer_buffer);
 179                                         urb->transfer_buffer = NULL;
 180                                 }
 181                         }
 182                         usb_free_urb (urb);
 183                 }
 184         }
 185
 186  out:
 187         return result;
 188 }
 189
 190 static void airprime_close(struct usb_serial_port *port, struct file * filp)
 191 {
 192         struct airprime_private *priv = usb_get_serial_port_data(port);
 193         int i;
 194
 195         dbg("%s - port %d", __FUNCTION__, port->number);
 196
 197         /* killing the urb will invoke read_bulk_callback() with an error status,
 198            so the transfer buffer will be freed there */
 199         for (i = 0; i < NUM_READ_URBS; ++i) {
 200                 usb_kill_urb (priv->read_urbp[i]);
 201                 usb_free_urb (priv->read_urbp[i]);
 202         }
 203
 204         /* free up private structure */
 205         kfree (priv);
 206         usb_set_serial_port_data(port, NULL);
 207 }
 208
 209 static int airprime_write(struct usb_serial_port *port,
 210                           const unsigned char *buf, int count)
 211 {
 212         struct airprime_private *priv = usb_get_serial_port_data(port);
 213         struct usb_serial *serial = port->serial;
 214         struct urb *urb;
 215         unsigned char *buffer;
 216         unsigned long flags;
 217         int status;
 218         dbg("%s - port %d", __FUNCTION__, port->number);
 219
 220         spin_lock_irqsave(&priv->lock, flags);
 221         if (priv->outstanding_urbs > NUM_WRITE_URBS) {
 222                 spin_unlock_irqrestore(&priv->lock, flags);
 223                 dbg("%s - write limit hit\n", __FUNCTION__);
 224                 return 0;
 225         }
 226         spin_unlock_irqrestore(&priv->lock, flags);
 227         buffer = kmalloc(count, GFP_ATOMIC);
 228         if (!buffer) {
 229                 dev_err(&port->dev, "out of memory\n");
 230                 return -ENOMEM;
 231         }
 232         urb = usb_alloc_urb(0, GFP_ATOMIC);
 233         if (!urb) {
 234                 dev_err(&port->dev, "no more free urbs\n");
 235                 kfree (buffer);
 236                 return -ENOMEM;
 237         }
 238         memcpy (buffer, buf, count);
 239
 240         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, buffer);
 241
 242         usb_fill_bulk_urb(urb, serial->dev,
 243                           usb_sndbulkpipe(serial->dev,
 244                                           port->bulk_out_endpointAddress),
 245                           buffer, count,
 246                           airprime_write_bulk_callback, port);
 247
 248         /* send it down the pipe */
 249         status = usb_submit_urb(urb, GFP_ATOMIC);
 250         if (status) {
 251                 dev_err(&port->dev,
 252                         "%s - usb_submit_urb(write bulk) failed with status = %d\n",
 253                         __FUNCTION__, status);
 254                 count = status;
 255                 kfree (buffer);
 256         } else {
 257                 spin_lock_irqsave(&priv->lock, flags);
 258                 ++priv->outstanding_urbs;
 259                 spin_unlock_irqrestore(&priv->lock, flags);
 260         }
 261         /* we are done with this urb, so let the host driver
 262          * really free it when it is finished with it */
 263         usb_free_urb (urb);
 264         return count;
 265 }
 266
 267 static struct usb_driver airprime_driver = {
 268         .name =         "airprime",
 269         .probe =        usb_serial_probe,
 270         .disconnect =   usb_serial_disconnect,
 271         .id_table =     id_table,
 272         .no_dynamic_id =        1,
 273 };
 274
 275 static struct usb_serial_driver airprime_device = {
 276         .driver = {
 277                 .owner =        THIS_MODULE,
 278                 .name =         "airprime",
 279         },
 280         .id_table =             id_table,
 281         .num_interrupt_in =     NUM_DONT_CARE,
 282         .num_bulk_in =          NUM_DONT_CARE,
 283         .num_bulk_out =         NUM_DONT_CARE,
 284         .open =                 airprime_open,
 285         .close =                airprime_close,
 286         .write =                airprime_write,
 287 };
 288
 289 static int __init airprime_init(void)
 290 {
 291         int retval;
 292
 293         airprime_device.num_ports =
 294                 (endpoints > 0 && endpoints <= MAX_BULK_EPS) ? endpoints : NUM_BULK_EPS;
 295         retval = usb_serial_register(&airprime_device);
 296         if (retval)
 297                 return retval;
 298         retval = usb_register(&airprime_driver);
 299         if (retval)
 300                 usb_serial_deregister(&airprime_device);
 301         return retval;
 302 }
 303
 304 static void __exit airprime_exit(void)
 305 {
 306         dbg("%s", __FUNCTION__);
 307
 308         usb_deregister(&airprime_driver);
 309         usb_serial_deregister(&airprime_device);
 310 }
 311
 312 module_init(airprime_init);
 313 module_exit(airprime_exit);
 314 MODULE_LICENSE("GPL");
 315
 316 module_param(debug, bool, S_IRUGO | S_IWUSR);
 317 MODULE_PARM_DESC(debug, "Debug enabled");
 318 module_param(buffer_size, int, 0);
 319 MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers in bytes (default 4096)");
 320 module_param(endpoints, int, 0);
 321 MODULE_PARM_DESC(endpoints, "Number of bulk EPs to configure (default 3)");