drivers/staging/tm6000/tm6000-alsa.c

   1 /*
   2  *
   3  *  Support for audio capture for tm5600/6000/6010
   4  *    (c) 2007-2008 Mauro Carvalho Chehab <mchehab@redhat.com>
   5  *
   6  *  Based on cx88-alsa.c
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License version 2 as
  10  *  published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/device.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/usb.h>
  18 #include <linux/slab.h>
  19 #include <linux/vmalloc.h>
  20
  21 #include <linux/delay.h>
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/control.h>
  26 #include <sound/initval.h>
  27
  28
  29 #include "tm6000.h"
  30 #include "tm6000-regs.h"
  31
  32 #undef dprintk
  33
  34 #define dprintk(level, fmt, arg...) do {                                   \
  35         if (debug >= level)                                                \
  36                 printk(KERN_INFO "%s/1: " fmt, chip->core->name , ## arg); \
  37         } while (0)
  38
  39 /****************************************************************************
  40                         Module global static vars
  41  ****************************************************************************/
  42
  43 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
  44
  45 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 1};
  46
  47 module_param_array(enable, bool, NULL, 0444);
  48 MODULE_PARM_DESC(enable, "Enable tm6000x soundcard. default enabled.");
  49
  50 module_param_array(index, int, NULL, 0444);
  51 MODULE_PARM_DESC(index, "Index value for tm6000x capture interface(s).");
  52
  53
  54 /****************************************************************************
  55                                 Module macros
  56  ****************************************************************************/
  57
  58 MODULE_DESCRIPTION("ALSA driver module for tm5600/tm6000/tm6010 based TV cards");
  59 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
  60 MODULE_LICENSE("GPL");
  61 MODULE_SUPPORTED_DEVICE("{{Trident,tm5600},"
  62                         "{{Trident,tm6000},"
  63                         "{{Trident,tm6010}");
  64 static unsigned int debug;
  65 module_param(debug, int, 0644);
  66 MODULE_PARM_DESC(debug, "enable debug messages");
  67
  68 /****************************************************************************
  69                         Module specific funtions
  70  ****************************************************************************/
  71
  72 /*
  73  * BOARD Specific: Sets audio DMA
  74  */
  75
  76 static int _tm6000_start_audio_dma(struct snd_tm6000_card *chip)
  77 {
  78         struct tm6000_core *core = chip->core;
  79
  80         dprintk(1, "Starting audio DMA\n");
  81
  82         /* Enables audio */
  83         tm6000_set_reg_mask(core, TM6010_REQ07_RCC_ACTIVE_VIDEO_IF, 0x40, 0x40);
  84
  85         tm6000_set_audio_bitrate(core, 48000);
  86
  87
  88         return 0;
  89 }
  90
  91 /*
  92  * BOARD Specific: Resets audio DMA
  93  */
  94 static int _tm6000_stop_audio_dma(struct snd_tm6000_card *chip)
  95 {
  96         struct tm6000_core *core = chip->core;
  97
  98         dprintk(1, "Stopping audio DMA\n");
  99
 100         /* Disables audio */
 101         tm6000_set_reg_mask(core, TM6010_REQ07_RCC_ACTIVE_VIDEO_IF, 0x00, 0x40);
 102
 103         return 0;
 104 }
 105
 106 static void dsp_buffer_free(struct snd_pcm_substream *substream)
 107 {
 108         struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);
 109
 110         dprintk(2, "Freeing buffer\n");
 111
 112         vfree(substream->runtime->dma_area);
 113         substream->runtime->dma_area = NULL;
 114         substream->runtime->dma_bytes = 0;
 115 }
 116
 117 static int dsp_buffer_alloc(struct snd_pcm_substream *substream, int size)
 118 {
 119         struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);
 120
 121         dprintk(2, "Allocating buffer\n");
 122
 123         if (substream->runtime->dma_area) {
 124                 if (substream->runtime->dma_bytes > size)
 125                         return 0;
 126                 dsp_buffer_free(substream);
 127         }
 128
 129         substream->runtime->dma_area = vmalloc(size);
 130         if (!substream->runtime->dma_area)
 131                 return -ENOMEM;
 132
 133         substream->runtime->dma_bytes = size;
 134
 135         return 0;
 136 }
 137
 138
 139 /****************************************************************************
 140                                 ALSA PCM Interface
 141  ****************************************************************************/
 142
 143 /*
 144  * Digital hardware definition
 145  */
 146 #define DEFAULT_FIFO_SIZE       4096
 147
 148 static struct snd_pcm_hardware snd_tm6000_digital_hw = {
 149         .info = SNDRV_PCM_INFO_MMAP |
 150                 SNDRV_PCM_INFO_INTERLEAVED |
 151                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 152                 SNDRV_PCM_INFO_MMAP_VALID,
 153         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 154
 155         .rates =                SNDRV_PCM_RATE_CONTINUOUS,
 156         .rate_min =             48000,
 157         .rate_max =             48000,
 158         .channels_min = 2,
 159         .channels_max = 2,
 160         .period_bytes_min = 64,
 161         .period_bytes_max = 12544,
 162         .periods_min = 1,
 163         .periods_max = 98,
 164         .buffer_bytes_max = 62720 * 8,
 165 };
 166
 167 /*
 168  * audio pcm capture open callback
 169  */
 170 static int snd_tm6000_pcm_open(struct snd_pcm_substream *substream)
 171 {
 172         struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);
 173         struct snd_pcm_runtime *runtime = substream->runtime;
 174         int err;
 175
 176         err = snd_pcm_hw_constraint_pow2(runtime, 0,
 177                                          SNDRV_PCM_HW_PARAM_PERIODS);
 178         if (err < 0)
 179                 goto _error;
 180
 181         chip->substream = substream;
 182
 183         runtime->hw = snd_tm6000_digital_hw;
 184
 185         return 0;
 186 _error:
 187         dprintk(1, "Error opening PCM!\n");
 188         return err;
 189 }
 190
 191 /*
 192  * audio close callback
 193  */
 194 static int snd_tm6000_close(struct snd_pcm_substream *substream)
 195 {
 196         struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);
 197         struct tm6000_core *core = chip->core;
 198
 199         if (atomic_read(&core->stream_started) > 0) {
 200                 atomic_set(&core->stream_started, 0);
 201                 schedule_work(&core->wq_trigger);
 202         }
 203
 204         return 0;
 205 }
 206
 207 static int tm6000_fillbuf(struct tm6000_core *core, char *buf, int size)
 208 {
 209         struct snd_tm6000_card *chip = core->adev;
 210         struct snd_pcm_substream *substream = chip->substream;
 211         struct snd_pcm_runtime *runtime;
 212         int period_elapsed = 0;
 213         unsigned int stride, buf_pos;
 214         int length;
 215
 216         if (atomic_read(&core->stream_started) == 0)
 217                 return 0;
 218
 219         if (!size || !substream) {
 220                 dprintk(1, "substream was NULL\n");
 221                 return -EINVAL;
 222         }
 223
 224         runtime = substream->runtime;
 225         if (!runtime || !runtime->dma_area) {
 226                 dprintk(1, "runtime was NULL\n");
 227                 return -EINVAL;
 228         }
 229
 230         buf_pos = chip->buf_pos;
 231         stride = runtime->frame_bits >> 3;
 232
 233         if (stride == 0) {
 234                 dprintk(1, "stride is zero\n");
 235                 return -EINVAL;
 236         }
 237
 238         length = size / stride;
 239         if (length == 0) {
 240                 dprintk(1, "%s: length was zero\n", __func__);
 241                 return -EINVAL;
 242         }
 243
 244         dprintk(1, "Copying %d bytes at %p[%d] - buf size=%d x %d\n", size,
 245                 runtime->dma_area, buf_pos,
 246                 (unsigned int)runtime->buffer_size, stride);
 247
 248         if (buf_pos + length >= runtime->buffer_size) {
 249                 unsigned int cnt = runtime->buffer_size - buf_pos;
 250                 memcpy(runtime->dma_area + buf_pos * stride, buf, cnt * stride);
 251                 memcpy(runtime->dma_area, buf + cnt * stride,
 252                         length * stride - cnt * stride);
 253         } else
 254                 memcpy(runtime->dma_area + buf_pos * stride, buf,
 255                         length * stride);
 256
 257 #ifndef NO_PCM_LOCK
 258         snd_pcm_stream_lock(substream);
 259 #endif
 260
 261         chip->buf_pos += length;
 262         if (chip->buf_pos >= runtime->buffer_size)
 263                 chip->buf_pos -= runtime->buffer_size;
 264
 265         chip->period_pos += length;
 266         if (chip->period_pos >= runtime->period_size) {
 267                 chip->period_pos -= runtime->period_size;
 268                 period_elapsed = 1;
 269         }
 270
 271 #ifndef NO_PCM_LOCK
 272         snd_pcm_stream_unlock(substream);
 273 #endif
 274
 275         if (period_elapsed)
 276                 snd_pcm_period_elapsed(substream);
 277
 278         return 0;
 279 }
 280
 281 /*
 282  * hw_params callback
 283  */
 284 static int snd_tm6000_hw_params(struct snd_pcm_substream *substream,
 285                               struct snd_pcm_hw_params *hw_params)
 286 {
 287         int size, rc;
 288
 289         size = params_period_bytes(hw_params) * params_periods(hw_params);
 290
 291         rc = dsp_buffer_alloc(substream, size);
 292         if (rc < 0)
 293                 return rc;
 294
 295         return 0;
 296 }
 297
 298 /*
 299  * hw free callback
 300  */
 301 static int snd_tm6000_hw_free(struct snd_pcm_substream *substream)
 302 {
 303         struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);
 304         struct tm6000_core *core = chip->core;
 305
 306         if (atomic_read(&core->stream_started) > 0) {
 307                 atomic_set(&core->stream_started, 0);
 308                 schedule_work(&core->wq_trigger);
 309         }
 310
 311         return 0;
 312 }
 313
 314 /*
 315  * prepare callback
 316  */
 317 static int snd_tm6000_prepare(struct snd_pcm_substream *substream)
 318 {
 319         struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);
 320
 321         chip->buf_pos = 0;
 322         chip->period_pos = 0;
 323
 324         return 0;
 325 }
 326
 327
 328 /*
 329  * trigger callback
 330  */
 331 static void audio_trigger(struct work_struct *work)
 332 {
 333         struct tm6000_core *core = container_of(work, struct tm6000_core,
 334                                                 wq_trigger);
 335         struct snd_tm6000_card *chip = core->adev;
 336
 337         if (atomic_read(&core->stream_started)) {
 338                 dprintk(1, "starting capture");
 339                 _tm6000_start_audio_dma(chip);
 340         } else {
 341                 dprintk(1, "stopping capture");
 342                 _tm6000_stop_audio_dma(chip);
 343         }
 344 }
 345
 346 static int snd_tm6000_card_trigger(struct snd_pcm_substream *substream, int cmd)
 347 {
 348         struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);
 349         struct tm6000_core *core = chip->core;
 350         int err = 0;
 351
 352         switch (cmd) {
 353         case SNDRV_PCM_TRIGGER_START:
 354                 atomic_set(&core->stream_started, 1);
 355                 break;
 356         case SNDRV_PCM_TRIGGER_STOP:
 357                 atomic_set(&core->stream_started, 0);
 358                 break;
 359         default:
 360                 err = -EINVAL;
 361                 break;
 362         }
 363         schedule_work(&core->wq_trigger);
 364
 365         return err;
 366 }
 367 /*
 368  * pointer callback
 369  */
 370 static snd_pcm_uframes_t snd_tm6000_pointer(struct snd_pcm_substream *substream)
 371 {
 372         struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);
 373
 374         return chip->buf_pos;
 375 }
 376
 377 /*
 378  * operators
 379  */
 380 static struct snd_pcm_ops snd_tm6000_pcm_ops = {
 381         .open = snd_tm6000_pcm_open,
 382         .close = snd_tm6000_close,
 383         .ioctl = snd_pcm_lib_ioctl,
 384         .hw_params = snd_tm6000_hw_params,
 385         .hw_free = snd_tm6000_hw_free,
 386         .prepare = snd_tm6000_prepare,
 387         .trigger = snd_tm6000_card_trigger,
 388         .pointer = snd_tm6000_pointer,
 389 };
 390
 391 /*
 392  * create a PCM device
 393  */
 394
 395 /* FIXME: Control interface - How to control volume/mute? */
 396
 397 /****************************************************************************
 398                         Basic Flow for Sound Devices
 399  ****************************************************************************/
 400
 401 /*
 402  * Alsa Constructor - Component probe
 403  */
 404 int tm6000_audio_init(struct tm6000_core *dev)
 405 {
 406         struct snd_card         *card;
 407         struct snd_tm6000_card  *chip;
 408         int                     rc;
 409         static int              devnr;
 410         char                    component[14];
 411         struct snd_pcm          *pcm;
 412
 413         if (!dev)
 414                 return 0;
 415
 416         if (devnr >= SNDRV_CARDS)
 417                 return -ENODEV;
 418
 419         if (!enable[devnr])
 420                 return -ENOENT;
 421
 422         rc = snd_card_create(index[devnr], "tm6000", THIS_MODULE, 0, &card);
 423         if (rc < 0) {
 424                 snd_printk(KERN_ERR "cannot create card instance %d\n", devnr);
 425                 return rc;
 426         }
 427         strcpy(card->driver, "tm6000-alsa");
 428         strcpy(card->shortname, "TM5600/60x0");
 429         sprintf(card->longname, "TM5600/60x0 Audio at bus %d device %d",
 430                 dev->udev->bus->busnum, dev->udev->devnum);
 431
 432         sprintf(component, "USB%04x:%04x",
 433                 le16_to_cpu(dev->udev->descriptor.idVendor),
 434                 le16_to_cpu(dev->udev->descriptor.idProduct));
 435         snd_component_add(card, component);
 436         snd_card_set_dev(card, &dev->udev->dev);
 437
 438         chip = kzalloc(sizeof(struct snd_tm6000_card), GFP_KERNEL);
 439         if (!chip) {
 440                 rc = -ENOMEM;
 441                 goto error;
 442         }
 443
 444         chip->core = dev;
 445         chip->card = card;
 446         dev->adev = chip;
 447         spin_lock_init(&chip->reg_lock);
 448
 449         rc = snd_pcm_new(card, "TM6000 Audio", 0, 0, 1, &pcm);
 450         if (rc < 0)
 451                 goto error_chip;
 452
 453         pcm->info_flags = 0;
 454         pcm->private_data = chip;
 455         strcpy(pcm->name, "Trident TM5600/60x0");
 456
 457         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_tm6000_pcm_ops);
 458
 459         INIT_WORK(&dev->wq_trigger, audio_trigger);
 460         rc = snd_card_register(card);
 461         if (rc < 0)
 462                 goto error_chip;
 463
 464         dprintk(1, "Registered audio driver for %s\n", card->longname);
 465
 466         return 0;
 467
 468 error_chip:
 469         kfree(chip);
 470         dev->adev = NULL;
 471 error:
 472         snd_card_free(card);
 473         return rc;
 474 }
 475
 476 static int tm6000_audio_fini(struct tm6000_core *dev)
 477 {
 478         struct snd_tm6000_card  *chip = dev->adev;
 479
 480         if (!dev)
 481                 return 0;
 482
 483         if (!chip)
 484                 return 0;
 485
 486         if (!chip->card)
 487                 return 0;
 488
 489         snd_card_free(chip->card);
 490         chip->card = NULL;
 491         kfree(chip);
 492         dev->adev = NULL;
 493
 494         return 0;
 495 }
 496
 497 struct tm6000_ops audio_ops = {
 498         .type   = TM6000_AUDIO,
 499         .name   = "TM6000 Audio Extension",
 500         .init   = tm6000_audio_init,
 501         .fini   = tm6000_audio_fini,
 502         .fillbuf = tm6000_fillbuf,
 503 };
 504
 505 static int __init tm6000_alsa_register(void)
 506 {
 507         return tm6000_register_extension(&audio_ops);
 508 }
 509
 510 static void __exit tm6000_alsa_unregister(void)
 511 {
 512         tm6000_unregister_extension(&audio_ops);
 513 }
 514
 515 module_init(tm6000_alsa_register);
 516 module_exit(tm6000_alsa_unregister);