Pileus Git - ~andy/linux/blob - drivers/staging/line6/midi.c

   1 /*
   2  * Line6 Linux USB driver - 0.9.1beta
   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/slab.h>
  13 #include <linux/usb.h>
  14 #include <sound/core.h>
  15 #include <sound/rawmidi.h>
  16
  17 #include "audio.h"
  18 #include "driver.h"
  19 #include "midi.h"
  20 #include "pod.h"
  21 #include "usbdefs.h"
  22
  23 #define line6_rawmidi_substream_midi(substream) \
  24         ((struct snd_line6_midi *)((substream)->rmidi->private_data))
  25
  26 static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
  27                            int length);
  28
  29 /*
  30         Pass data received via USB to MIDI.
  31 */
  32 void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
  33                         int length)
  34 {
  35         if (line6->line6midi->substream_receive)
  36                 snd_rawmidi_receive(line6->line6midi->substream_receive,
  37                                     data, length);
  38 }
  39
  40 /*
  41         Read data from MIDI buffer and transmit them via USB.
  42 */
  43 static void line6_midi_transmit(struct snd_rawmidi_substream *substream)
  44 {
  45         struct usb_line6 *line6 =
  46             line6_rawmidi_substream_midi(substream)->line6;
  47         struct snd_line6_midi *line6midi = line6->line6midi;
  48         struct MidiBuffer *mb = &line6midi->midibuf_out;
  49         unsigned long flags;
  50         unsigned char chunk[line6->max_packet_size];
  51         int req, done;
  52
  53         spin_lock_irqsave(&line6->line6midi->midi_transmit_lock, flags);
  54
  55         for (;;) {
  56                 req = min(line6_midibuf_bytes_free(mb), line6->max_packet_size);
  57                 done = snd_rawmidi_transmit_peek(substream, chunk, req);
  58
  59                 if (done == 0)
  60                         break;
  61
  62 #ifdef CONFIG_LINE6_USB_DUMP_MIDI
  63                 line6_write_hexdump(line6, 's', chunk, done);
  64 #endif
  65                 line6_midibuf_write(mb, chunk, done);
  66                 snd_rawmidi_transmit_ack(substream, done);
  67         }
  68
  69         for (;;) {
  70                 done = line6_midibuf_read(mb, chunk, line6->max_packet_size);
  71
  72                 if (done == 0)
  73                         break;
  74
  75                 if (line6_midibuf_skip_message
  76                     (mb, line6midi->midi_mask_transmit))
  77                         continue;
  78
  79                 send_midi_async(line6, chunk, done);
  80         }
  81
  82         spin_unlock_irqrestore(&line6->line6midi->midi_transmit_lock, flags);
  83 }
  84
  85 /*
  86         Notification of completion of MIDI transmission.
  87 */
  88 static void midi_sent(struct urb *urb)
  89 {
  90         unsigned long flags;
  91         int status;
  92         int num;
  93         struct usb_line6 *line6 = (struct usb_line6 *)urb->context;
  94
  95         status = urb->status;
  96         kfree(urb->transfer_buffer);
  97         usb_free_urb(urb);
  98
  99         if (status == -ESHUTDOWN)
 100                 return;
 101
 102         spin_lock_irqsave(&line6->line6midi->send_urb_lock, flags);
 103         num = --line6->line6midi->num_active_send_urbs;
 104
 105         if (num == 0) {
 106                 line6_midi_transmit(line6->line6midi->substream_transmit);
 107                 num = line6->line6midi->num_active_send_urbs;
 108         }
 109
 110         if (num == 0)
 111                 wake_up(&line6->line6midi->send_wait);
 112
 113         spin_unlock_irqrestore(&line6->line6midi->send_urb_lock, flags);
 114 }
 115
 116 /*
 117         Send an asynchronous MIDI message.
 118         Assumes that line6->line6midi->send_urb_lock is held
 119         (i.e., this function is serialized).
 120 */
 121 static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
 122                            int length)
 123 {
 124         struct urb *urb;
 125         int retval;
 126         unsigned char *transfer_buffer;
 127
 128         urb = usb_alloc_urb(0, GFP_ATOMIC);
 129
 130         if (urb == NULL) {
 131                 dev_err(line6->ifcdev, "Out of memory\n");
 132                 return -ENOMEM;
 133         }
 134
 135         transfer_buffer = kmemdup(data, length, GFP_ATOMIC);
 136
 137         if (transfer_buffer == NULL) {
 138                 usb_free_urb(urb);
 139                 dev_err(line6->ifcdev, "Out of memory\n");
 140                 return -ENOMEM;
 141         }
 142
 143         usb_fill_int_urb(urb, line6->usbdev,
 144                          usb_sndbulkpipe(line6->usbdev,
 145                                          line6->ep_control_write),
 146                          transfer_buffer, length, midi_sent, line6,
 147                          line6->interval);
 148         urb->actual_length = 0;
 149         retval = usb_submit_urb(urb, GFP_ATOMIC);
 150
 151         if (retval < 0) {
 152                 dev_err(line6->ifcdev, "usb_submit_urb failed\n");
 153                 usb_free_urb(urb);
 154                 return -EINVAL;
 155         }
 156
 157         ++line6->line6midi->num_active_send_urbs;
 158
 159         switch (line6->usbdev->descriptor.idProduct) {
 160         case LINE6_DEVID_BASSPODXT:
 161         case LINE6_DEVID_BASSPODXTLIVE:
 162         case LINE6_DEVID_BASSPODXTPRO:
 163         case LINE6_DEVID_PODXT:
 164         case LINE6_DEVID_PODXTLIVE:
 165         case LINE6_DEVID_PODXTPRO:
 166         case LINE6_DEVID_POCKETPOD:
 167                 line6_pod_midi_postprocess((struct usb_line6_pod *)line6, data,
 168                                            length);
 169                 break;
 170
 171         case LINE6_DEVID_VARIAX:
 172         case LINE6_DEVID_PODHD300:
 173         case LINE6_DEVID_PODHD500:
 174                 break;
 175
 176         default:
 177                 MISSING_CASE;
 178         }
 179
 180         return 0;
 181 }
 182
 183 static int line6_midi_output_open(struct snd_rawmidi_substream *substream)
 184 {
 185         return 0;
 186 }
 187
 188 static int line6_midi_output_close(struct snd_rawmidi_substream *substream)
 189 {
 190         return 0;
 191 }
 192
 193 static void line6_midi_output_trigger(struct snd_rawmidi_substream *substream,
 194                                       int up)
 195 {
 196         unsigned long flags;
 197         struct usb_line6 *line6 =
 198             line6_rawmidi_substream_midi(substream)->line6;
 199
 200         line6->line6midi->substream_transmit = substream;
 201         spin_lock_irqsave(&line6->line6midi->send_urb_lock, flags);
 202
 203         if (line6->line6midi->num_active_send_urbs == 0)
 204                 line6_midi_transmit(substream);
 205
 206         spin_unlock_irqrestore(&line6->line6midi->send_urb_lock, flags);
 207 }
 208
 209 static void line6_midi_output_drain(struct snd_rawmidi_substream *substream)
 210 {
 211         struct usb_line6 *line6 =
 212             line6_rawmidi_substream_midi(substream)->line6;
 213         struct snd_line6_midi *midi = line6->line6midi;
 214         wait_event_interruptible(midi->send_wait,
 215                                  midi->num_active_send_urbs == 0);
 216 }
 217
 218 static int line6_midi_input_open(struct snd_rawmidi_substream *substream)
 219 {
 220         return 0;
 221 }
 222
 223 static int line6_midi_input_close(struct snd_rawmidi_substream *substream)
 224 {
 225         return 0;
 226 }
 227
 228 static void line6_midi_input_trigger(struct snd_rawmidi_substream *substream,
 229                                      int up)
 230 {
 231         struct usb_line6 *line6 =
 232             line6_rawmidi_substream_midi(substream)->line6;
 233
 234         if (up)
 235                 line6->line6midi->substream_receive = substream;
 236         else
 237                 line6->line6midi->substream_receive = 0;
 238 }
 239
 240 static struct snd_rawmidi_ops line6_midi_output_ops = {
 241         .open = line6_midi_output_open,
 242         .close = line6_midi_output_close,
 243         .trigger = line6_midi_output_trigger,
 244         .drain = line6_midi_output_drain,
 245 };
 246
 247 static struct snd_rawmidi_ops line6_midi_input_ops = {
 248         .open = line6_midi_input_open,
 249         .close = line6_midi_input_close,
 250         .trigger = line6_midi_input_trigger,
 251 };
 252
 253 /*
 254         Cleanup the Line6 MIDI device.
 255 */
 256 static void line6_cleanup_midi(struct snd_rawmidi *rmidi)
 257 {
 258 }
 259
 260 /* Create a MIDI device */
 261 static int snd_line6_new_midi(struct snd_line6_midi *line6midi)
 262 {
 263         struct snd_rawmidi *rmidi;
 264         int err;
 265
 266         err = snd_rawmidi_new(line6midi->line6->card, "Line6 MIDI", 0, 1, 1,
 267                               &rmidi);
 268         if (err < 0)
 269                 return err;
 270
 271         rmidi->private_data = line6midi;
 272         rmidi->private_free = line6_cleanup_midi;
 273         strcpy(rmidi->id, line6midi->line6->properties->id);
 274         strcpy(rmidi->name, line6midi->line6->properties->name);
 275
 276         rmidi->info_flags =
 277             SNDRV_RAWMIDI_INFO_OUTPUT |
 278             SNDRV_RAWMIDI_INFO_INPUT | SNDRV_RAWMIDI_INFO_DUPLEX;
 279
 280         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
 281                             &line6_midi_output_ops);
 282         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
 283                             &line6_midi_input_ops);
 284         return 0;
 285 }
 286
 287 /*
 288         "read" request on "midi_mask_transmit" special file.
 289 */
 290 static ssize_t midi_get_midi_mask_transmit(struct device *dev,
 291                                            struct device_attribute *attr,
 292                                            char *buf)
 293 {
 294         struct usb_interface *interface = to_usb_interface(dev);
 295         struct usb_line6 *line6 = usb_get_intfdata(interface);
 296         return sprintf(buf, "%d\n", line6->line6midi->midi_mask_transmit);
 297 }
 298
 299 /*
 300         "write" request on "midi_mask" special file.
 301 */
 302 static ssize_t midi_set_midi_mask_transmit(struct device *dev,
 303                                            struct device_attribute *attr,
 304                                            const char *buf, size_t count)
 305 {
 306         struct usb_interface *interface = to_usb_interface(dev);
 307         struct usb_line6 *line6 = usb_get_intfdata(interface);
 308         unsigned short value;
 309         int ret;
 310
 311         ret = kstrtou16(buf, 10, &value);
 312         if (ret)
 313                 return ret;
 314
 315         line6->line6midi->midi_mask_transmit = value;
 316         return count;
 317 }
 318
 319 /*
 320         "read" request on "midi_mask_receive" special file.
 321 */
 322 static ssize_t midi_get_midi_mask_receive(struct device *dev,
 323                                           struct device_attribute *attr,
 324                                           char *buf)
 325 {
 326         struct usb_interface *interface = to_usb_interface(dev);
 327         struct usb_line6 *line6 = usb_get_intfdata(interface);
 328         return sprintf(buf, "%d\n", line6->line6midi->midi_mask_receive);
 329 }
 330
 331 /*
 332         "write" request on "midi_mask" special file.
 333 */
 334 static ssize_t midi_set_midi_mask_receive(struct device *dev,
 335                                           struct device_attribute *attr,
 336                                           const char *buf, size_t count)
 337 {
 338         struct usb_interface *interface = to_usb_interface(dev);
 339         struct usb_line6 *line6 = usb_get_intfdata(interface);
 340         unsigned short value;
 341         int ret;
 342
 343         ret = kstrtou16(buf, 10, &value);
 344         if (ret)
 345                 return ret;
 346
 347         line6->line6midi->midi_mask_receive = value;
 348         return count;
 349 }
 350
 351 static DEVICE_ATTR(midi_mask_transmit, S_IWUSR | S_IRUGO,
 352                    midi_get_midi_mask_transmit, midi_set_midi_mask_transmit);
 353 static DEVICE_ATTR(midi_mask_receive, S_IWUSR | S_IRUGO,
 354                    midi_get_midi_mask_receive, midi_set_midi_mask_receive);
 355
 356 /* MIDI device destructor */
 357 static int snd_line6_midi_free(struct snd_device *device)
 358 {
 359         struct snd_line6_midi *line6midi = device->device_data;
 360         device_remove_file(line6midi->line6->ifcdev,
 361                            &dev_attr_midi_mask_transmit);
 362         device_remove_file(line6midi->line6->ifcdev,
 363                            &dev_attr_midi_mask_receive);
 364         line6_midibuf_destroy(&line6midi->midibuf_in);
 365         line6_midibuf_destroy(&line6midi->midibuf_out);
 366         return 0;
 367 }
 368
 369 /*
 370         Initialize the Line6 MIDI subsystem.
 371 */
 372 int line6_init_midi(struct usb_line6 *line6)
 373 {
 374         static struct snd_device_ops midi_ops = {
 375                 .dev_free = snd_line6_midi_free,
 376         };
 377
 378         int err;
 379         struct snd_line6_midi *line6midi;
 380
 381         if (!(line6->properties->capabilities & LINE6_BIT_CONTROL)) {
 382                 /* skip MIDI initialization and report success */
 383                 return 0;
 384         }
 385
 386         line6midi = kzalloc(sizeof(struct snd_line6_midi), GFP_KERNEL);
 387
 388         if (line6midi == NULL)
 389                 return -ENOMEM;
 390
 391         err = line6_midibuf_init(&line6midi->midibuf_in, MIDI_BUFFER_SIZE, 0);
 392         if (err < 0) {
 393                 kfree(line6midi);
 394                 return err;
 395         }
 396
 397         err = line6_midibuf_init(&line6midi->midibuf_out, MIDI_BUFFER_SIZE, 1);
 398         if (err < 0) {
 399                 kfree(line6midi->midibuf_in.buf);
 400                 kfree(line6midi);
 401                 return err;
 402         }
 403
 404         line6midi->line6 = line6;
 405
 406         switch (line6->product) {
 407         case LINE6_DEVID_PODHD300:
 408         case LINE6_DEVID_PODHD500:
 409                 line6midi->midi_mask_transmit = 1;
 410                 line6midi->midi_mask_receive = 1;
 411                 break;
 412
 413         default:
 414                 line6midi->midi_mask_transmit = 1;
 415                 line6midi->midi_mask_receive = 4;
 416         }
 417
 418         line6->line6midi = line6midi;
 419
 420         err = snd_device_new(line6->card, SNDRV_DEV_RAWMIDI, line6midi,
 421                              &midi_ops);
 422         if (err < 0)
 423                 return err;
 424
 425         snd_card_set_dev(line6->card, line6->ifcdev);
 426
 427         err = snd_line6_new_midi(line6midi);
 428         if (err < 0)
 429                 return err;
 430
 431         err = device_create_file(line6->ifcdev, &dev_attr_midi_mask_transmit);
 432         if (err < 0)
 433                 return err;
 434
 435         err = device_create_file(line6->ifcdev, &dev_attr_midi_mask_receive);
 436         if (err < 0)
 437                 return err;
 438
 439         init_waitqueue_head(&line6midi->send_wait);
 440         spin_lock_init(&line6midi->send_urb_lock);
 441         spin_lock_init(&line6midi->midi_transmit_lock);
 442         return 0;
 443 }