sound/usb/line6/driver.c

   1 /*
   2  * Line 6 Linux USB driver
   3  *
   4  * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
   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 as
   8  *      published by the Free Software Foundation, version 2.
   9  *
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/export.h>
  15 #include <linux/slab.h>
  16 #include <linux/usb.h>
  17
  18 #include <sound/core.h>
  19 #include <sound/initval.h>
  20
  21 #include "capture.h"
  22 #include "driver.h"
  23 #include "midi.h"
  24 #include "playback.h"
  25
  26 #define DRIVER_AUTHOR  "Markus Grabner <grabner@icg.tugraz.at>"
  27 #define DRIVER_DESC    "Line 6 USB Driver"
  28
  29 /*
  30         This is Line 6's MIDI manufacturer ID.
  31 */
  32 const unsigned char line6_midi_id[] = {
  33         0x00, 0x01, 0x0c
  34 };
  35 EXPORT_SYMBOL_GPL(line6_midi_id);
  36
  37 /*
  38         Code to request version of POD, Variax interface
  39         (and maybe other devices).
  40 */
  41 static const char line6_request_version[] = {
  42         0xf0, 0x7e, 0x7f, 0x06, 0x01, 0xf7
  43 };
  44
  45 /*
  46          Class for asynchronous messages.
  47 */
  48 struct message {
  49         struct usb_line6 *line6;
  50         const char *buffer;
  51         int size;
  52         int done;
  53 };
  54
  55 /*
  56         Forward declarations.
  57 */
  58 static void line6_data_received(struct urb *urb);
  59 static int line6_send_raw_message_async_part(struct message *msg,
  60                                              struct urb *urb);
  61
  62 /*
  63         Start to listen on endpoint.
  64 */
  65 static int line6_start_listen(struct usb_line6 *line6)
  66 {
  67         int err;
  68
  69         usb_fill_int_urb(line6->urb_listen, line6->usbdev,
  70                 usb_rcvintpipe(line6->usbdev, line6->properties->ep_ctrl_r),
  71                 line6->buffer_listen, LINE6_BUFSIZE_LISTEN,
  72                 line6_data_received, line6, line6->interval);
  73         line6->urb_listen->actual_length = 0;
  74         err = usb_submit_urb(line6->urb_listen, GFP_ATOMIC);
  75         return err;
  76 }
  77
  78 /*
  79         Stop listening on endpoint.
  80 */
  81 static void line6_stop_listen(struct usb_line6 *line6)
  82 {
  83         usb_kill_urb(line6->urb_listen);
  84 }
  85
  86 /*
  87         Send raw message in pieces of wMaxPacketSize bytes.
  88 */
  89 static int line6_send_raw_message(struct usb_line6 *line6, const char *buffer,
  90                                   int size)
  91 {
  92         int i, done = 0;
  93
  94         for (i = 0; i < size; i += line6->max_packet_size) {
  95                 int partial;
  96                 const char *frag_buf = buffer + i;
  97                 int frag_size = min(line6->max_packet_size, size - i);
  98                 int retval;
  99
 100                 retval = usb_interrupt_msg(line6->usbdev,
 101                                         usb_sndintpipe(line6->usbdev,
 102                                                 line6->properties->ep_ctrl_w),
 103                                         (char *)frag_buf, frag_size,
 104                                         &partial, LINE6_TIMEOUT * HZ);
 105
 106                 if (retval) {
 107                         dev_err(line6->ifcdev,
 108                                 "usb_interrupt_msg failed (%d)\n", retval);
 109                         break;
 110                 }
 111
 112                 done += frag_size;
 113         }
 114
 115         return done;
 116 }
 117
 118 /*
 119         Notification of completion of asynchronous request transmission.
 120 */
 121 static void line6_async_request_sent(struct urb *urb)
 122 {
 123         struct message *msg = (struct message *)urb->context;
 124
 125         if (msg->done >= msg->size) {
 126                 usb_free_urb(urb);
 127                 kfree(msg);
 128         } else
 129                 line6_send_raw_message_async_part(msg, urb);
 130 }
 131
 132 /*
 133         Asynchronously send part of a raw message.
 134 */
 135 static int line6_send_raw_message_async_part(struct message *msg,
 136                                              struct urb *urb)
 137 {
 138         int retval;
 139         struct usb_line6 *line6 = msg->line6;
 140         int done = msg->done;
 141         int bytes = min(msg->size - done, line6->max_packet_size);
 142
 143         usb_fill_int_urb(urb, line6->usbdev,
 144                 usb_sndintpipe(line6->usbdev, line6->properties->ep_ctrl_w),
 145                 (char *)msg->buffer + done, bytes,
 146                 line6_async_request_sent, msg, line6->interval);
 147
 148         msg->done += bytes;
 149         retval = usb_submit_urb(urb, GFP_ATOMIC);
 150
 151         if (retval < 0) {
 152                 dev_err(line6->ifcdev, "%s: usb_submit_urb failed (%d)\n",
 153                         __func__, retval);
 154                 usb_free_urb(urb);
 155                 kfree(msg);
 156                 return retval;
 157         }
 158
 159         return 0;
 160 }
 161
 162 /*
 163         Setup and start timer.
 164 */
 165 void line6_start_timer(struct timer_list *timer, unsigned long msecs,
 166                        void (*function)(unsigned long), unsigned long data)
 167 {
 168         setup_timer(timer, function, data);
 169         mod_timer(timer, jiffies + msecs_to_jiffies(msecs));
 170 }
 171 EXPORT_SYMBOL_GPL(line6_start_timer);
 172
 173 /*
 174         Asynchronously send raw message.
 175 */
 176 int line6_send_raw_message_async(struct usb_line6 *line6, const char *buffer,
 177                                  int size)
 178 {
 179         struct message *msg;
 180         struct urb *urb;
 181
 182         /* create message: */
 183         msg = kmalloc(sizeof(struct message), GFP_ATOMIC);
 184         if (msg == NULL)
 185                 return -ENOMEM;
 186
 187         /* create URB: */
 188         urb = usb_alloc_urb(0, GFP_ATOMIC);
 189
 190         if (urb == NULL) {
 191                 kfree(msg);
 192                 return -ENOMEM;
 193         }
 194
 195         /* set message data: */
 196         msg->line6 = line6;
 197         msg->buffer = buffer;
 198         msg->size = size;
 199         msg->done = 0;
 200
 201         /* start sending: */
 202         return line6_send_raw_message_async_part(msg, urb);
 203 }
 204 EXPORT_SYMBOL_GPL(line6_send_raw_message_async);
 205
 206 /*
 207         Send asynchronous device version request.
 208 */
 209 int line6_version_request_async(struct usb_line6 *line6)
 210 {
 211         char *buffer;
 212         int retval;
 213
 214         buffer = kmemdup(line6_request_version,
 215                         sizeof(line6_request_version), GFP_ATOMIC);
 216         if (buffer == NULL)
 217                 return -ENOMEM;
 218
 219         retval = line6_send_raw_message_async(line6, buffer,
 220                                               sizeof(line6_request_version));
 221         kfree(buffer);
 222         return retval;
 223 }
 224 EXPORT_SYMBOL_GPL(line6_version_request_async);
 225
 226 /*
 227         Send sysex message in pieces of wMaxPacketSize bytes.
 228 */
 229 int line6_send_sysex_message(struct usb_line6 *line6, const char *buffer,
 230                              int size)
 231 {
 232         return line6_send_raw_message(line6, buffer,
 233                                       size + SYSEX_EXTRA_SIZE) -
 234             SYSEX_EXTRA_SIZE;
 235 }
 236 EXPORT_SYMBOL_GPL(line6_send_sysex_message);
 237
 238 /*
 239         Allocate buffer for sysex message and prepare header.
 240         @param code sysex message code
 241         @param size number of bytes between code and sysex end
 242 */
 243 char *line6_alloc_sysex_buffer(struct usb_line6 *line6, int code1, int code2,
 244                                int size)
 245 {
 246         char *buffer = kmalloc(size + SYSEX_EXTRA_SIZE, GFP_ATOMIC);
 247
 248         if (!buffer)
 249                 return NULL;
 250
 251         buffer[0] = LINE6_SYSEX_BEGIN;
 252         memcpy(buffer + 1, line6_midi_id, sizeof(line6_midi_id));
 253         buffer[sizeof(line6_midi_id) + 1] = code1;
 254         buffer[sizeof(line6_midi_id) + 2] = code2;
 255         buffer[sizeof(line6_midi_id) + 3 + size] = LINE6_SYSEX_END;
 256         return buffer;
 257 }
 258 EXPORT_SYMBOL_GPL(line6_alloc_sysex_buffer);
 259
 260 /*
 261         Notification of data received from the Line 6 device.
 262 */
 263 static void line6_data_received(struct urb *urb)
 264 {
 265         struct usb_line6 *line6 = (struct usb_line6 *)urb->context;
 266         struct midi_buffer *mb = &line6->line6midi->midibuf_in;
 267         int done;
 268
 269         if (urb->status == -ESHUTDOWN)
 270                 return;
 271
 272         done =
 273             line6_midibuf_write(mb, urb->transfer_buffer, urb->actual_length);
 274
 275         if (done < urb->actual_length) {
 276                 line6_midibuf_ignore(mb, done);
 277                 dev_dbg(line6->ifcdev, "%d %d buffer overflow - message skipped\n",
 278                         done, urb->actual_length);
 279         }
 280
 281         for (;;) {
 282                 done =
 283                     line6_midibuf_read(mb, line6->buffer_message,
 284                                        LINE6_MESSAGE_MAXLEN);
 285
 286                 if (done == 0)
 287                         break;
 288
 289                 line6->message_length = done;
 290                 line6_midi_receive(line6, line6->buffer_message, done);
 291
 292                 if (line6->process_message)
 293                         line6->process_message(line6);
 294         }
 295
 296         line6_start_listen(line6);
 297 }
 298
 299 #define LINE6_READ_WRITE_STATUS_DELAY 2  /* milliseconds */
 300
 301 /*
 302         Read data from device.
 303 */
 304 int line6_read_data(struct usb_line6 *line6, int address, void *data,
 305                     size_t datalen)
 306 {
 307         struct usb_device *usbdev = line6->usbdev;
 308         int ret;
 309         unsigned char len;
 310
 311         /* query the serial number: */
 312         ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
 313                               USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
 314                               (datalen << 8) | 0x21, address,
 315                               NULL, 0, LINE6_TIMEOUT * HZ);
 316
 317         if (ret < 0) {
 318                 dev_err(line6->ifcdev, "read request failed (error %d)\n", ret);
 319                 return ret;
 320         }
 321
 322         /* Wait for data length. We'll get 0xff until length arrives. */
 323         do {
 324                 mdelay(LINE6_READ_WRITE_STATUS_DELAY);
 325
 326                 ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
 327                                       USB_TYPE_VENDOR | USB_RECIP_DEVICE |
 328                                       USB_DIR_IN,
 329                                       0x0012, 0x0000, &len, 1,
 330                                       LINE6_TIMEOUT * HZ);
 331                 if (ret < 0) {
 332                         dev_err(line6->ifcdev,
 333                                 "receive length failed (error %d)\n", ret);
 334                         return ret;
 335                 }
 336         } while (len == 0xff);
 337
 338         if (len != datalen) {
 339                 /* should be equal or something went wrong */
 340                 dev_err(line6->ifcdev,
 341                         "length mismatch (expected %d, got %d)\n",
 342                         (int)datalen, (int)len);
 343                 return -EINVAL;
 344         }
 345
 346         /* receive the result: */
 347         ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
 348                               USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 349                               0x0013, 0x0000, data, datalen,
 350                               LINE6_TIMEOUT * HZ);
 351
 352         if (ret < 0) {
 353                 dev_err(line6->ifcdev, "read failed (error %d)\n", ret);
 354                 return ret;
 355         }
 356
 357         return 0;
 358 }
 359 EXPORT_SYMBOL_GPL(line6_read_data);
 360
 361 /*
 362         Write data to device.
 363 */
 364 int line6_write_data(struct usb_line6 *line6, int address, void *data,
 365                      size_t datalen)
 366 {
 367         struct usb_device *usbdev = line6->usbdev;
 368         int ret;
 369         unsigned char status;
 370
 371         ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
 372                               USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
 373                               0x0022, address, data, datalen,
 374                               LINE6_TIMEOUT * HZ);
 375
 376         if (ret < 0) {
 377                 dev_err(line6->ifcdev,
 378                         "write request failed (error %d)\n", ret);
 379                 return ret;
 380         }
 381
 382         do {
 383                 mdelay(LINE6_READ_WRITE_STATUS_DELAY);
 384
 385                 ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
 386                                       0x67,
 387                                       USB_TYPE_VENDOR | USB_RECIP_DEVICE |
 388                                       USB_DIR_IN,
 389                                       0x0012, 0x0000,
 390                                       &status, 1, LINE6_TIMEOUT * HZ);
 391
 392                 if (ret < 0) {
 393                         dev_err(line6->ifcdev,
 394                                 "receiving status failed (error %d)\n", ret);
 395                         return ret;
 396                 }
 397         } while (status == 0xff);
 398
 399         if (status != 0) {
 400                 dev_err(line6->ifcdev, "write failed (error %d)\n", ret);
 401                 return -EINVAL;
 402         }
 403
 404         return 0;
 405 }
 406 EXPORT_SYMBOL_GPL(line6_write_data);
 407
 408 /*
 409         Read Line 6 device serial number.
 410         (POD, TonePort, GuitarPort)
 411 */
 412 int line6_read_serial_number(struct usb_line6 *line6, int *serial_number)
 413 {
 414         return line6_read_data(line6, 0x80d0, serial_number,
 415                                sizeof(*serial_number));
 416 }
 417 EXPORT_SYMBOL_GPL(line6_read_serial_number);
 418
 419 /*
 420         Card destructor.
 421 */
 422 static void line6_destruct(struct snd_card *card)
 423 {
 424         struct usb_line6 *line6 = card->private_data;
 425         struct usb_device *usbdev = line6->usbdev;
 426
 427         /* free buffer memory first: */
 428         kfree(line6->buffer_message);
 429         kfree(line6->buffer_listen);
 430
 431         /* then free URBs: */
 432         usb_free_urb(line6->urb_listen);
 433
 434         /* decrement reference counters: */
 435         usb_put_dev(usbdev);
 436 }
 437
 438 /* get data from endpoint descriptor (see usb_maxpacket): */
 439 static void line6_get_interval(struct usb_line6 *line6)
 440 {
 441         struct usb_device *usbdev = line6->usbdev;
 442         struct usb_host_endpoint *ep;
 443         unsigned pipe = usb_rcvintpipe(usbdev, line6->properties->ep_ctrl_r);
 444         unsigned epnum = usb_pipeendpoint(pipe);
 445
 446         ep = usbdev->ep_in[epnum];
 447         if (ep) {
 448                 line6->interval = ep->desc.bInterval;
 449                 line6->max_packet_size = le16_to_cpu(ep->desc.wMaxPacketSize);
 450         } else {
 451                 dev_err(line6->ifcdev,
 452                         "endpoint not available, using fallback values");
 453                 line6->interval = LINE6_FALLBACK_INTERVAL;
 454                 line6->max_packet_size = LINE6_FALLBACK_MAXPACKETSIZE;
 455         }
 456 }
 457
 458 static int line6_init_cap_control(struct usb_line6 *line6)
 459 {
 460         int ret;
 461
 462         /* initialize USB buffers: */
 463         line6->buffer_listen = kmalloc(LINE6_BUFSIZE_LISTEN, GFP_KERNEL);
 464         if (!line6->buffer_listen)
 465                 return -ENOMEM;
 466
 467         line6->buffer_message = kmalloc(LINE6_MESSAGE_MAXLEN, GFP_KERNEL);
 468         if (!line6->buffer_message)
 469                 return -ENOMEM;
 470
 471         line6->urb_listen = usb_alloc_urb(0, GFP_KERNEL);
 472         if (!line6->urb_listen)
 473                 return -ENOMEM;
 474
 475         ret = line6_start_listen(line6);
 476         if (ret < 0) {
 477                 dev_err(line6->ifcdev, "cannot start listening: %d\n", ret);
 478                 return ret;
 479         }
 480
 481         return 0;
 482 }
 483
 484 /*
 485         Probe USB device.
 486 */
 487 int line6_probe(struct usb_interface *interface,
 488                 const struct usb_device_id *id,
 489                 const char *driver_name,
 490                 const struct line6_properties *properties,
 491                 int (*private_init)(struct usb_line6 *, const struct usb_device_id *id),
 492                 size_t data_size)
 493 {
 494         struct usb_device *usbdev = interface_to_usbdev(interface);
 495         struct snd_card *card;
 496         struct usb_line6 *line6;
 497         int interface_number;
 498         int ret;
 499
 500         if (WARN_ON(data_size < sizeof(*line6)))
 501                 return -EINVAL;
 502
 503         /* we don't handle multiple configurations */
 504         if (usbdev->descriptor.bNumConfigurations != 1)
 505                 return -ENODEV;
 506
 507         ret = snd_card_new(&interface->dev,
 508                            SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 509                            THIS_MODULE, data_size, &card);
 510         if (ret < 0)
 511                 return ret;
 512
 513         /* store basic data: */
 514         line6 = card->private_data;
 515         line6->card = card;
 516         line6->properties = properties;
 517         line6->usbdev = usbdev;
 518         line6->ifcdev = &interface->dev;
 519
 520         strcpy(card->id, properties->id);
 521         strcpy(card->driver, driver_name);
 522         strcpy(card->shortname, properties->name);
 523         sprintf(card->longname, "Line 6 %s at USB %s", properties->name,
 524                 dev_name(line6->ifcdev));
 525         card->private_free = line6_destruct;
 526
 527         usb_set_intfdata(interface, line6);
 528
 529         /* increment reference counters: */
 530         usb_get_dev(usbdev);
 531
 532         /* initialize device info: */
 533         dev_info(&interface->dev, "Line 6 %s found\n", properties->name);
 534
 535         /* query interface number */
 536         interface_number = interface->cur_altsetting->desc.bInterfaceNumber;
 537
 538         ret = usb_set_interface(usbdev, interface_number,
 539                                 properties->altsetting);
 540         if (ret < 0) {
 541                 dev_err(&interface->dev, "set_interface failed\n");
 542                 goto error;
 543         }
 544
 545         line6_get_interval(line6);
 546
 547         if (properties->capabilities & LINE6_CAP_CONTROL) {
 548                 ret = line6_init_cap_control(line6);
 549                 if (ret < 0)
 550                         goto error;
 551         }
 552
 553         /* initialize device data based on device: */
 554         ret = private_init(line6, id);
 555         if (ret < 0)
 556                 goto error;
 557
 558         /* creation of additional special files should go here */
 559
 560         dev_info(&interface->dev, "Line 6 %s now attached\n",
 561                  properties->name);
 562
 563         return 0;
 564
 565  error:
 566         if (line6->disconnect)
 567                 line6->disconnect(line6);
 568         snd_card_free(card);
 569         return ret;
 570 }
 571 EXPORT_SYMBOL_GPL(line6_probe);
 572
 573 /*
 574         Line 6 device disconnected.
 575 */
 576 void line6_disconnect(struct usb_interface *interface)
 577 {
 578         struct usb_line6 *line6 = usb_get_intfdata(interface);
 579         struct usb_device *usbdev = interface_to_usbdev(interface);
 580
 581         if (!line6)
 582                 return;
 583
 584         if (WARN_ON(usbdev != line6->usbdev))
 585                 return;
 586
 587         if (line6->urb_listen != NULL)
 588                 line6_stop_listen(line6);
 589
 590         snd_card_disconnect(line6->card);
 591         if (line6->line6pcm)
 592                 line6_pcm_disconnect(line6->line6pcm);
 593         if (line6->disconnect)
 594                 line6->disconnect(line6);
 595
 596         dev_info(&interface->dev, "Line 6 %s now disconnected\n",
 597                  line6->properties->name);
 598
 599         /* make sure the device isn't destructed twice: */
 600         usb_set_intfdata(interface, NULL);
 601
 602         snd_card_free_when_closed(line6->card);
 603 }
 604 EXPORT_SYMBOL_GPL(line6_disconnect);
 605
 606 #ifdef CONFIG_PM
 607
 608 /*
 609         Suspend Line 6 device.
 610 */
 611 int line6_suspend(struct usb_interface *interface, pm_message_t message)
 612 {
 613         struct usb_line6 *line6 = usb_get_intfdata(interface);
 614         struct snd_line6_pcm *line6pcm = line6->line6pcm;
 615
 616         snd_power_change_state(line6->card, SNDRV_CTL_POWER_D3hot);
 617
 618         if (line6->properties->capabilities & LINE6_CAP_CONTROL)
 619                 line6_stop_listen(line6);
 620
 621         if (line6pcm != NULL) {
 622                 snd_pcm_suspend_all(line6pcm->pcm);
 623                 line6pcm->flags = 0;
 624         }
 625
 626         return 0;
 627 }
 628 EXPORT_SYMBOL_GPL(line6_suspend);
 629
 630 /*
 631         Resume Line 6 device.
 632 */
 633 int line6_resume(struct usb_interface *interface)
 634 {
 635         struct usb_line6 *line6 = usb_get_intfdata(interface);
 636
 637         if (line6->properties->capabilities & LINE6_CAP_CONTROL)
 638                 line6_start_listen(line6);
 639
 640         snd_power_change_state(line6->card, SNDRV_CTL_POWER_D0);
 641         return 0;
 642 }
 643 EXPORT_SYMBOL_GPL(line6_resume);
 644
 645 #endif /* CONFIG_PM */
 646
 647 MODULE_AUTHOR(DRIVER_AUTHOR);
 648 MODULE_DESCRIPTION(DRIVER_DESC);
 649 MODULE_LICENSE("GPL");