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         { },
  22 };
  23 MODULE_DEVICE_TABLE(usb, id_table);
  24
  25 #define URB_TRANSFER_BUFFER_SIZE        4096
  26 #define NUM_READ_URBS                   4
  27 #define NUM_WRITE_URBS                  4
  28 #define NUM_BULK_EPS                    3
  29 #define MAX_BULK_EPS                    6
  30
  31 /* if overridden by the user, then use their value for the size of the
  32  * read and write urbs, and the number of endpoints */
  33 static int buffer_size = URB_TRANSFER_BUFFER_SIZE;
  34 static int endpoints = NUM_BULK_EPS;
  35 static int debug;
  36 struct airprime_private {
  37         spinlock_t lock;
  38         int outstanding_urbs;
  39         int throttled;
  40         struct urb *read_urbp[NUM_READ_URBS];
  41
  42         /* Settings for the port */
  43         int rts_state;  /* Handshaking pins (outputs) */
  44         int dtr_state;
  45         int cts_state;  /* Handshaking pins (inputs) */
  46         int dsr_state;
  47         int dcd_state;
  48         int ri_state;
  49 };
  50
  51 static int airprime_send_setup(struct usb_serial_port *port)
  52 {
  53         struct usb_serial *serial = port->serial;
  54         struct airprime_private *priv;
  55
  56         dbg("%s", __func__);
  57
  58         if (port->number != 0)
  59                 return 0;
  60
  61         priv = usb_get_serial_port_data(port);
  62
  63         if (port->port.tty) {
  64                 int val = 0;
  65                 if (priv->dtr_state)
  66                         val |= 0x01;
  67                 if (priv->rts_state)
  68                         val |= 0x02;
  69
  70                 return usb_control_msg(serial->dev,
  71                                         usb_rcvctrlpipe(serial->dev, 0),
  72                                         0x22, 0x21, val, 0, NULL, 0,
  73                                         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", __func__, port->number);
  88
  89         if (status) {
  90                 dbg("%s - nonzero read bulk status received: %d",
  91                     __func__, status);
  92                 return;
  93         }
  94         usb_serial_debug_data(debug, &port->dev, __func__,
  95                                                 urb->actual_length, data);
  96
  97         tty = port->port.tty;
  98         if (tty && urb->actual_length) {
  99                 tty_insert_flip_string(tty, data, urb->actual_length);
 100                 tty_flip_buffer_push(tty);
 101         }
 102
 103         result = usb_submit_urb(urb, GFP_ATOMIC);
 104         if (result)
 105                 dev_err(&port->dev,
 106                         "%s - failed resubmitting read urb, error %d\n",
 107                         __func__, result);
 108         return;
 109 }
 110
 111 static void airprime_write_bulk_callback(struct urb *urb)
 112 {
 113         struct usb_serial_port *port = urb->context;
 114         struct airprime_private *priv = usb_get_serial_port_data(port);
 115         int status = urb->status;
 116         unsigned long flags;
 117
 118         dbg("%s - port %d", __func__, port->number);
 119
 120         /* free up the transfer buffer, as usb_free_urb() does not do this */
 121         kfree(urb->transfer_buffer);
 122
 123         if (status)
 124                 dbg("%s - nonzero write bulk status received: %d",
 125                     __func__, status);
 126         spin_lock_irqsave(&priv->lock, flags);
 127         --priv->outstanding_urbs;
 128         spin_unlock_irqrestore(&priv->lock, flags);
 129
 130         usb_serial_port_softint(port);
 131 }
 132
 133 static int airprime_open(struct tty_struct *tty, struct usb_serial_port *port,
 134                                                         struct file *filp)
 135 {
 136         struct airprime_private *priv = usb_get_serial_port_data(port);
 137         struct usb_serial *serial = port->serial;
 138         struct urb *urb;
 139         char *buffer = NULL;
 140         int i;
 141         int result = 0;
 142
 143         dbg("%s - port %d", __func__, port->number);
 144
 145         /* initialize our private data structure if it isn't already created */
 146         if (!priv) {
 147                 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 148                 if (!priv) {
 149                         result = -ENOMEM;
 150                         goto out;
 151                 }
 152                 spin_lock_init(&priv->lock);
 153                 usb_set_serial_port_data(port, priv);
 154         }
 155
 156         /* Set some sane defaults */
 157         priv->rts_state = 1;
 158         priv->dtr_state = 1;
 159
 160         for (i = 0; i < NUM_READ_URBS; ++i) {
 161                 buffer = kmalloc(buffer_size, GFP_KERNEL);
 162                 if (!buffer) {
 163                         dev_err(&port->dev, "%s - out of memory.\n",
 164                                 __func__);
 165                         result = -ENOMEM;
 166                         goto errout;
 167                 }
 168                 urb = usb_alloc_urb(0, GFP_KERNEL);
 169                 if (!urb) {
 170                         kfree(buffer);
 171                         dev_err(&port->dev, "%s - no more urbs?\n",
 172                                 __func__);
 173                         result = -ENOMEM;
 174                         goto errout;
 175                 }
 176                 usb_fill_bulk_urb(urb, serial->dev,
 177                                   usb_rcvbulkpipe(serial->dev,
 178                                           port->bulk_out_endpointAddress),
 179                                   buffer, buffer_size,
 180                                   airprime_read_bulk_callback, port);
 181                 result = usb_submit_urb(urb, GFP_KERNEL);
 182                 if (result) {
 183                         usb_free_urb(urb);
 184                         kfree(buffer);
 185                         dev_err(&port->dev,
 186                                 "%s - failed submitting read urb %d for port %d, error %d\n",
 187                                 __func__, i, port->number, result);
 188                         goto errout;
 189                 }
 190                 /* remember this urb so we can kill it when the
 191                    port is closed */
 192                 priv->read_urbp[i] = urb;
 193         }
 194
 195         airprime_send_setup(port);
 196
 197         goto out;
 198
 199  errout:
 200         /* some error happened, cancel any submitted urbs and clean up
 201            anything that got allocated successfully */
 202
 203         while (i-- != 0) {
 204                 urb = priv->read_urbp[i];
 205                 buffer = urb->transfer_buffer;
 206                 usb_kill_urb(urb);
 207                 usb_free_urb(urb);
 208                 kfree(buffer);
 209         }
 210
 211  out:
 212         return result;
 213 }
 214
 215 static void airprime_close(struct tty_struct *tty,
 216                         struct usb_serial_port *port, struct file *filp)
 217 {
 218         struct airprime_private *priv = usb_get_serial_port_data(port);
 219         int i;
 220
 221         dbg("%s - port %d", __func__, port->number);
 222
 223         priv->rts_state = 0;
 224         priv->dtr_state = 0;
 225
 226         mutex_lock(&port->serial->disc_mutex);
 227         if (!port->serial->disconnected)
 228                 airprime_send_setup(port);
 229         mutex_unlock(&port->serial->disc_mutex);
 230
 231         for (i = 0; i < NUM_READ_URBS; ++i) {
 232                 usb_kill_urb(priv->read_urbp[i]);
 233                 kfree(priv->read_urbp[i]->transfer_buffer);
 234                 usb_free_urb(priv->read_urbp[i]);
 235         }
 236
 237         /* free up private structure */
 238         kfree(priv);
 239         usb_set_serial_port_data(port, NULL);
 240 }
 241
 242 static int airprime_write(struct tty_struct *tty, struct usb_serial_port *port,
 243                           const unsigned char *buf, int count)
 244 {
 245         struct airprime_private *priv = usb_get_serial_port_data(port);
 246         struct usb_serial *serial = port->serial;
 247         struct urb *urb;
 248         unsigned char *buffer;
 249         unsigned long flags;
 250         int status;
 251         dbg("%s - port %d", __func__, port->number);
 252
 253         spin_lock_irqsave(&priv->lock, flags);
 254         if (priv->outstanding_urbs > NUM_WRITE_URBS) {
 255                 spin_unlock_irqrestore(&priv->lock, flags);
 256                 dbg("%s - write limit hit\n", __func__);
 257                 return 0;
 258         }
 259         spin_unlock_irqrestore(&priv->lock, flags);
 260         buffer = kmalloc(count, GFP_ATOMIC);
 261         if (!buffer) {
 262                 dev_err(&port->dev, "out of memory\n");
 263                 return -ENOMEM;
 264         }
 265         urb = usb_alloc_urb(0, GFP_ATOMIC);
 266         if (!urb) {
 267                 dev_err(&port->dev, "no more free urbs\n");
 268                 kfree(buffer);
 269                 return -ENOMEM;
 270         }
 271         memcpy(buffer, buf, count);
 272
 273         usb_serial_debug_data(debug, &port->dev, __func__, count, buffer);
 274
 275         usb_fill_bulk_urb(urb, serial->dev,
 276                           usb_sndbulkpipe(serial->dev,
 277                                           port->bulk_out_endpointAddress),
 278                           buffer, count,
 279                           airprime_write_bulk_callback, port);
 280
 281         /* send it down the pipe */
 282         status = usb_submit_urb(urb, GFP_ATOMIC);
 283         if (status) {
 284                 dev_err(&port->dev,
 285                         "%s - usb_submit_urb(write bulk) failed with status = %d\n",
 286                         __func__, status);
 287                 count = status;
 288                 kfree(buffer);
 289         } else {
 290                 spin_lock_irqsave(&priv->lock, flags);
 291                 ++priv->outstanding_urbs;
 292                 spin_unlock_irqrestore(&priv->lock, flags);
 293         }
 294         /* we are done with this urb, so let the host driver
 295          * really free it when it is finished with it */
 296         usb_free_urb(urb);
 297         return count;
 298 }
 299
 300 static struct usb_driver airprime_driver = {
 301         .name =         "airprime",
 302         .probe =        usb_serial_probe,
 303         .disconnect =   usb_serial_disconnect,
 304         .id_table =     id_table,
 305         .no_dynamic_id =        1,
 306 };
 307
 308 static struct usb_serial_driver airprime_device = {
 309         .driver = {
 310                 .owner =        THIS_MODULE,
 311                 .name =         "airprime",
 312         },
 313         .usb_driver =           &airprime_driver,
 314         .id_table =             id_table,
 315         .open =                 airprime_open,
 316         .close =                airprime_close,
 317         .write =                airprime_write,
 318 };
 319
 320 static int __init airprime_init(void)
 321 {
 322         int retval;
 323
 324         airprime_device.num_ports = endpoints;
 325         if (endpoints < 0 || endpoints >= MAX_BULK_EPS)
 326                 airprime_device.num_ports = NUM_BULK_EPS;
 327
 328         retval = usb_serial_register(&airprime_device);
 329         if (retval)
 330                 return retval;
 331         retval = usb_register(&airprime_driver);
 332         if (retval)
 333                 usb_serial_deregister(&airprime_device);
 334         return retval;
 335 }
 336
 337 static void __exit airprime_exit(void)
 338 {
 339         dbg("%s", __func__);
 340
 341         usb_deregister(&airprime_driver);
 342         usb_serial_deregister(&airprime_device);
 343 }
 344
 345 module_init(airprime_init);
 346 module_exit(airprime_exit);
 347 MODULE_LICENSE("GPL");
 348
 349 module_param(debug, bool, S_IRUGO | S_IWUSR);
 350 MODULE_PARM_DESC(debug, "Debug enabled");
 351 module_param(buffer_size, int, 0);
 352 MODULE_PARM_DESC(buffer_size,
 353                 "Size of the transfer buffers in bytes (default 4096)");
 354 module_param(endpoints, int, 0);
 355 MODULE_PARM_DESC(endpoints, "Number of bulk EPs to configure (default 3)");