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