SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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(0x413c, 0x8115) }, /* Dell Wireless HSDPA 5500 */
  22         { },
  23 };
  24 MODULE_DEVICE_TABLE(usb, id_table);
  25
  26 #define URB_TRANSFER_BUFFER_SIZE        4096
  27 #define NUM_READ_URBS                   4
  28 #define NUM_WRITE_URBS                  4
  29 #define NUM_BULK_EPS                    3
  30 #define MAX_BULK_EPS                    6
  31
  32 /* if overridden by the user, then use their value for the size of the
  33  * read and write urbs, and the number of endpoints */
  34 static int buffer_size = URB_TRANSFER_BUFFER_SIZE;
  35 static int endpoints = NUM_BULK_EPS;
  36 static int debug;
  37 struct airprime_private {
  38         spinlock_t lock;
  39         int outstanding_urbs;
  40         int throttled;
  41         struct urb *read_urbp[NUM_READ_URBS];
  42
  43         /* Settings for the port */
  44         int rts_state;  /* Handshaking pins (outputs) */
  45         int dtr_state;
  46         int cts_state;  /* Handshaking pins (inputs) */
  47         int dsr_state;
  48         int dcd_state;
  49         int ri_state;
  50 };
  51
  52 static int airprime_send_setup(struct usb_serial_port *port)
  53 {
  54         struct usb_serial *serial = port->serial;
  55         struct airprime_private *priv;
  56
  57         dbg("%s", __FUNCTION__);
  58
  59         if (port->number != 0)
  60                 return 0;
  61
  62         priv = usb_get_serial_port_data(port);
  63
  64         if (port->tty) {
  65                 int val = 0;
  66                 if (priv->dtr_state)
  67                         val |= 0x01;
  68                 if (priv->rts_state)
  69                         val |= 0x02;
  70
  71                 return usb_control_msg(serial->dev,
  72                                 usb_rcvctrlpipe(serial->dev, 0),
  73                                 0x22,0x21,val,0,NULL,0,USB_CTRL_SET_TIMEOUT);
  74         }
  75
  76         return 0;
  77 }
  78
  79 static void airprime_read_bulk_callback(struct urb *urb)
  80 {
  81         struct usb_serial_port *port = urb->context;
  82         unsigned char *data = urb->transfer_buffer;
  83         struct tty_struct *tty;
  84         int result;
  85         int status = urb->status;
  86
  87         dbg("%s - port %d", __FUNCTION__, port->number);
  88
  89         if (status) {
  90                 dbg("%s - nonzero read bulk status received: %d",
  91                     __FUNCTION__, status);
  92                 return;
  93         }
  94         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
  95
  96         tty = port->tty;
  97         if (tty && urb->actual_length) {
  98                 tty_insert_flip_string (tty, data, urb->actual_length);
  99                 tty_flip_buffer_push (tty);
 100         }
 101
 102         result = usb_submit_urb (urb, GFP_ATOMIC);
 103         if (result)
 104                 dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n",
 105                         __FUNCTION__, result);
 106         return;
 107 }
 108
 109 static void airprime_write_bulk_callback(struct urb *urb)
 110 {
 111         struct usb_serial_port *port = urb->context;
 112         struct airprime_private *priv = usb_get_serial_port_data(port);
 113         int status = urb->status;
 114         unsigned long flags;
 115
 116         dbg("%s - port %d", __FUNCTION__, port->number);
 117
 118         /* free up the transfer buffer, as usb_free_urb() does not do this */
 119         kfree (urb->transfer_buffer);
 120
 121         if (status)
 122                 dbg("%s - nonzero write bulk status received: %d",
 123                     __FUNCTION__, status);
 124         spin_lock_irqsave(&priv->lock, flags);
 125         --priv->outstanding_urbs;
 126         spin_unlock_irqrestore(&priv->lock, flags);
 127
 128         usb_serial_port_softint(port);
 129 }
 130
 131 static int airprime_open(struct usb_serial_port *port, struct file *filp)
 132 {
 133         struct airprime_private *priv = usb_get_serial_port_data(port);
 134         struct usb_serial *serial = port->serial;
 135         struct urb *urb;
 136         char *buffer = NULL;
 137         int i;
 138         int result = 0;
 139
 140         dbg("%s - port %d", __FUNCTION__, port->number);
 141
 142         /* initialize our private data structure if it isn't already created */
 143         if (!priv) {
 144                 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 145                 if (!priv) {
 146                         result = -ENOMEM;
 147                         goto out;
 148                 }
 149                 spin_lock_init(&priv->lock);
 150                 usb_set_serial_port_data(port, priv);
 151         }
 152
 153         /* Set some sane defaults */
 154         priv->rts_state = 1;
 155         priv->dtr_state = 1;
 156
 157         for (i = 0; i < NUM_READ_URBS; ++i) {
 158                 buffer = kmalloc(buffer_size, GFP_KERNEL);
 159                 if (!buffer) {
 160                         dev_err(&port->dev, "%s - out of memory.\n",
 161                                 __FUNCTION__);
 162                         result = -ENOMEM;
 163                         goto errout;
 164                 }
 165                 urb = usb_alloc_urb(0, GFP_KERNEL);
 166                 if (!urb) {
 167                         kfree(buffer);
 168                         dev_err(&port->dev, "%s - no more urbs?\n",
 169                                 __FUNCTION__);
 170                         result = -ENOMEM;
 171                         goto errout;
 172                 }
 173                 usb_fill_bulk_urb(urb, serial->dev,
 174                                   usb_rcvbulkpipe(serial->dev,
 175                                                   port->bulk_out_endpointAddress),
 176                                   buffer, buffer_size,
 177                                   airprime_read_bulk_callback, port);
 178                 result = usb_submit_urb(urb, GFP_KERNEL);
 179                 if (result) {
 180                         usb_free_urb(urb);
 181                         kfree(buffer);
 182                         dev_err(&port->dev,
 183                                 "%s - failed submitting read urb %d for port %d, error %d\n",
 184                                 __FUNCTION__, i, port->number, result);
 185                         goto errout;
 186                 }
 187                 /* remember this urb so we can kill it when the port is closed */
 188                 priv->read_urbp[i] = urb;
 189         }
 190
 191         airprime_send_setup(port);
 192
 193         goto out;
 194
 195  errout:
 196         /* some error happened, cancel any submitted urbs and clean up anything that
 197            got allocated successfully */
 198
 199         while (i-- != 0) {
 200                 urb = priv->read_urbp[i];
 201                 buffer = urb->transfer_buffer;
 202                 usb_kill_urb (urb);
 203                 usb_free_urb (urb);
 204                 kfree (buffer);
 205         }
 206
 207  out:
 208         return result;
 209 }
 210
 211 static void airprime_close(struct usb_serial_port *port, struct file * filp)
 212 {
 213         struct airprime_private *priv = usb_get_serial_port_data(port);
 214         int i;
 215
 216         dbg("%s - port %d", __FUNCTION__, port->number);
 217
 218         priv->rts_state = 0;
 219         priv->dtr_state = 0;
 220
 221         airprime_send_setup(port);
 222
 223         for (i = 0; i < NUM_READ_URBS; ++i) {
 224                 usb_kill_urb (priv->read_urbp[i]);
 225                 kfree (priv->read_urbp[i]->transfer_buffer);
 226                 usb_free_urb (priv->read_urbp[i]);
 227         }
 228
 229         /* free up private structure */
 230         kfree (priv);
 231         usb_set_serial_port_data(port, NULL);
 232 }
 233
 234 static int airprime_write(struct usb_serial_port *port,
 235                           const unsigned char *buf, int count)
 236 {
 237         struct airprime_private *priv = usb_get_serial_port_data(port);
 238         struct usb_serial *serial = port->serial;
 239         struct urb *urb;
 240         unsigned char *buffer;
 241         unsigned long flags;
 242         int status;
 243         dbg("%s - port %d", __FUNCTION__, port->number);
 244
 245         spin_lock_irqsave(&priv->lock, flags);
 246         if (priv->outstanding_urbs > NUM_WRITE_URBS) {
 247                 spin_unlock_irqrestore(&priv->lock, flags);
 248                 dbg("%s - write limit hit\n", __FUNCTION__);
 249                 return 0;
 250         }
 251         spin_unlock_irqrestore(&priv->lock, flags);
 252         buffer = kmalloc(count, GFP_ATOMIC);
 253         if (!buffer) {
 254                 dev_err(&port->dev, "out of memory\n");
 255                 return -ENOMEM;
 256         }
 257         urb = usb_alloc_urb(0, GFP_ATOMIC);
 258         if (!urb) {
 259                 dev_err(&port->dev, "no more free urbs\n");
 260                 kfree (buffer);
 261                 return -ENOMEM;
 262         }
 263         memcpy (buffer, buf, count);
 264
 265         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, buffer);
 266
 267         usb_fill_bulk_urb(urb, serial->dev,
 268                           usb_sndbulkpipe(serial->dev,
 269                                           port->bulk_out_endpointAddress),
 270                           buffer, count,
 271                           airprime_write_bulk_callback, port);
 272
 273         /* send it down the pipe */
 274         status = usb_submit_urb(urb, GFP_ATOMIC);
 275         if (status) {
 276                 dev_err(&port->dev,
 277                         "%s - usb_submit_urb(write bulk) failed with status = %d\n",
 278                         __FUNCTION__, status);
 279                 count = status;
 280                 kfree (buffer);
 281         } else {
 282                 spin_lock_irqsave(&priv->lock, flags);
 283                 ++priv->outstanding_urbs;
 284                 spin_unlock_irqrestore(&priv->lock, flags);
 285         }
 286         /* we are done with this urb, so let the host driver
 287          * really free it when it is finished with it */
 288         usb_free_urb (urb);
 289         return count;
 290 }
 291
 292 static struct usb_driver airprime_driver = {
 293         .name =         "airprime",
 294         .probe =        usb_serial_probe,
 295         .disconnect =   usb_serial_disconnect,
 296         .id_table =     id_table,
 297         .no_dynamic_id =        1,
 298 };
 299
 300 static struct usb_serial_driver airprime_device = {
 301         .driver = {
 302                 .owner =        THIS_MODULE,
 303                 .name =         "airprime",
 304         },
 305         .usb_driver =           &airprime_driver,
 306         .id_table =             id_table,
 307         .num_interrupt_in =     NUM_DONT_CARE,
 308         .num_bulk_in =          NUM_DONT_CARE,
 309         .num_bulk_out =         NUM_DONT_CARE,
 310         .open =                 airprime_open,
 311         .close =                airprime_close,
 312         .write =                airprime_write,
 313 };
 314
 315 static int __init airprime_init(void)
 316 {
 317         int retval;
 318
 319         airprime_device.num_ports =
 320                 (endpoints > 0 && endpoints <= MAX_BULK_EPS) ? endpoints : NUM_BULK_EPS;
 321         retval = usb_serial_register(&airprime_device);
 322         if (retval)
 323                 return retval;
 324         retval = usb_register(&airprime_driver);
 325         if (retval)
 326                 usb_serial_deregister(&airprime_device);
 327         return retval;
 328 }
 329
 330 static void __exit airprime_exit(void)
 331 {
 332         dbg("%s", __FUNCTION__);
 333
 334         usb_deregister(&airprime_driver);
 335         usb_serial_deregister(&airprime_device);
 336 }
 337
 338 module_init(airprime_init);
 339 module_exit(airprime_exit);
 340 MODULE_LICENSE("GPL");
 341
 342 module_param(debug, bool, S_IRUGO | S_IWUSR);
 343 MODULE_PARM_DESC(debug, "Debug enabled");
 344 module_param(buffer_size, int, 0);
 345 MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers in bytes (default 4096)");
 346 module_param(endpoints, int, 0);
 347 MODULE_PARM_DESC(endpoints, "Number of bulk EPs to configure (default 3)");