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         return 0;
  88 }
  89
  90 /*
  91  * BOARD Specific: Resets audio DMA
  92  */
  93 static int _tm6000_stop_audio_dma(struct snd_tm6000_card *chip)
  94 {
  95         struct tm6000_core *core = chip->core;
  96
  97         dprintk(1, "Stopping audio DMA\n");
  98
  99         /* Disables audio */
 100         tm6000_set_reg_mask(core, TM6010_REQ07_RCC_ACTIVE_VIDEO_IF, 0x00, 0x40);
 101
 102         return 0;
 103 }
 104
 105 static void dsp_buffer_free(struct snd_pcm_substream *substream)
 106 {
 107         struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);
 108
 109         dprintk(2, "Freeing buffer\n");
 110
 111         vfree(substream->runtime->dma_area);
 112         substream->runtime->dma_area = NULL;
 113         substream->runtime->dma_bytes = 0;
 114 }
 115
 116 static int dsp_buffer_alloc(struct snd_pcm_substream *substream, int size)
 117 {
 118         struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);
 119
 120         dprintk(2, "Allocating buffer\n");
 121
 122         if (substream->runtime->dma_area) {
 123                 if (substream->runtime->dma_bytes > size)
 124                         return 0;
 125
 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        snd_pcm_stream_lock(substream);
 258
 259         chip->buf_pos += length;
 260         if (chip->buf_pos >= runtime->buffer_size)
 261                 chip->buf_pos -= runtime->buffer_size;
 262
 263         chip->period_pos += length;
 264         if (chip->period_pos >= runtime->period_size) {
 265                 chip->period_pos -= runtime->period_size;
 266                 period_elapsed = 1;
 267         }
 268
 269        snd_pcm_stream_unlock(substream);
 270
 271         if (period_elapsed)
 272                 snd_pcm_period_elapsed(substream);
 273
 274         return 0;
 275 }
 276
 277 /*
 278  * hw_params callback
 279  */
 280 static int snd_tm6000_hw_params(struct snd_pcm_substream *substream,
 281                               struct snd_pcm_hw_params *hw_params)
 282 {
 283         int size, rc;
 284
 285         size = params_period_bytes(hw_params) * params_periods(hw_params);
 286
 287         rc = dsp_buffer_alloc(substream, size);
 288         if (rc < 0)
 289                 return rc;
 290
 291         return 0;
 292 }
 293
 294 /*
 295  * hw free callback
 296  */
 297 static int snd_tm6000_hw_free(struct snd_pcm_substream *substream)
 298 {
 299         struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);
 300         struct tm6000_core *core = chip->core;
 301
 302         if (atomic_read(&core->stream_started) > 0) {
 303                 atomic_set(&core->stream_started, 0);
 304                 schedule_work(&core->wq_trigger);
 305         }
 306
 307         return 0;
 308 }
 309
 310 /*
 311  * prepare callback
 312  */
 313 static int snd_tm6000_prepare(struct snd_pcm_substream *substream)
 314 {
 315         struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);
 316
 317         chip->buf_pos = 0;
 318         chip->period_pos = 0;
 319
 320         return 0;
 321 }
 322
 323
 324 /*
 325  * trigger callback
 326  */
 327 static void audio_trigger(struct work_struct *work)
 328 {
 329         struct tm6000_core *core = container_of(work, struct tm6000_core,
 330                                                 wq_trigger);
 331         struct snd_tm6000_card *chip = core->adev;
 332
 333         if (atomic_read(&core->stream_started)) {
 334                 dprintk(1, "starting capture");
 335                 _tm6000_start_audio_dma(chip);
 336         } else {
 337                 dprintk(1, "stopping capture");
 338                 _tm6000_stop_audio_dma(chip);
 339         }
 340 }
 341
 342 static int snd_tm6000_card_trigger(struct snd_pcm_substream *substream, int cmd)
 343 {
 344         struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);
 345         struct tm6000_core *core = chip->core;
 346         int err = 0;
 347
 348         switch (cmd) {
 349         case SNDRV_PCM_TRIGGER_START:
 350                 atomic_set(&core->stream_started, 1);
 351                 break;
 352         case SNDRV_PCM_TRIGGER_STOP:
 353                 atomic_set(&core->stream_started, 0);
 354                 break;
 355         default:
 356                 err = -EINVAL;
 357                 break;
 358         }
 359         schedule_work(&core->wq_trigger);
 360
 361         return err;
 362 }
 363 /*
 364  * pointer callback
 365  */
 366 static snd_pcm_uframes_t snd_tm6000_pointer(struct snd_pcm_substream *substream)
 367 {
 368         struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);
 369
 370         return chip->buf_pos;
 371 }
 372
 373 /*
 374  * operators
 375  */
 376 static struct snd_pcm_ops snd_tm6000_pcm_ops = {
 377         .open = snd_tm6000_pcm_open,
 378         .close = snd_tm6000_close,
 379         .ioctl = snd_pcm_lib_ioctl,
 380         .hw_params = snd_tm6000_hw_params,
 381         .hw_free = snd_tm6000_hw_free,
 382         .prepare = snd_tm6000_prepare,
 383         .trigger = snd_tm6000_card_trigger,
 384         .pointer = snd_tm6000_pointer,
 385 };
 386
 387 /*
 388  * create a PCM device
 389  */
 390
 391 /* FIXME: Control interface - How to control volume/mute? */
 392
 393 /****************************************************************************
 394                         Basic Flow for Sound Devices
 395  ****************************************************************************/
 396
 397 /*
 398  * Alsa Constructor - Component probe
 399  */
 400 int tm6000_audio_init(struct tm6000_core *dev)
 401 {
 402         struct snd_card         *card;
 403         struct snd_tm6000_card  *chip;
 404         int                     rc;
 405         static int              devnr;
 406         char                    component[14];
 407         struct snd_pcm          *pcm;
 408
 409         if (!dev)
 410                 return 0;
 411
 412         if (devnr >= SNDRV_CARDS)
 413                 return -ENODEV;
 414
 415         if (!enable[devnr])
 416                 return -ENOENT;
 417
 418         rc = snd_card_create(index[devnr], "tm6000", THIS_MODULE, 0, &card);
 419         if (rc < 0) {
 420                 snd_printk(KERN_ERR "cannot create card instance %d\n", devnr);
 421                 return rc;
 422         }
 423         strcpy(card->driver, "tm6000-alsa");
 424         strcpy(card->shortname, "TM5600/60x0");
 425         sprintf(card->longname, "TM5600/60x0 Audio at bus %d device %d",
 426                 dev->udev->bus->busnum, dev->udev->devnum);
 427
 428         sprintf(component, "USB%04x:%04x",
 429                 le16_to_cpu(dev->udev->descriptor.idVendor),
 430                 le16_to_cpu(dev->udev->descriptor.idProduct));
 431         snd_component_add(card, component);
 432         snd_card_set_dev(card, &dev->udev->dev);
 433
 434         chip = kzalloc(sizeof(struct snd_tm6000_card), GFP_KERNEL);
 435         if (!chip) {
 436                 rc = -ENOMEM;
 437                 goto error;
 438         }
 439
 440         chip->core = dev;
 441         chip->card = card;
 442         dev->adev = chip;
 443         spin_lock_init(&chip->reg_lock);
 444
 445         rc = snd_pcm_new(card, "TM6000 Audio", 0, 0, 1, &pcm);
 446         if (rc < 0)
 447                 goto error_chip;
 448
 449         pcm->info_flags = 0;
 450         pcm->private_data = chip;
 451         strcpy(pcm->name, "Trident TM5600/60x0");
 452
 453         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_tm6000_pcm_ops);
 454
 455         INIT_WORK(&dev->wq_trigger, audio_trigger);
 456         rc = snd_card_register(card);
 457         if (rc < 0)
 458                 goto error_chip;
 459
 460         dprintk(1, "Registered audio driver for %s\n", card->longname);
 461
 462         return 0;
 463
 464 error_chip:
 465         kfree(chip);
 466         dev->adev = NULL;
 467 error:
 468         snd_card_free(card);
 469         return rc;
 470 }
 471
 472 static int tm6000_audio_fini(struct tm6000_core *dev)
 473 {
 474         struct snd_tm6000_card  *chip = dev->adev;
 475
 476         if (!dev)
 477                 return 0;
 478
 479         if (!chip)
 480                 return 0;
 481
 482         if (!chip->card)
 483                 return 0;
 484
 485         snd_card_free(chip->card);
 486         chip->card = NULL;
 487         kfree(chip);
 488         dev->adev = NULL;
 489
 490         return 0;
 491 }
 492
 493 struct tm6000_ops audio_ops = {
 494         .type   = TM6000_AUDIO,
 495         .name   = "TM6000 Audio Extension",
 496         .init   = tm6000_audio_init,
 497         .fini   = tm6000_audio_fini,
 498         .fillbuf = tm6000_fillbuf,
 499 };
 500
 501 static int __init tm6000_alsa_register(void)
 502 {
 503         return tm6000_register_extension(&audio_ops);
 504 }
 505
 506 static void __exit tm6000_alsa_unregister(void)
 507 {
 508         tm6000_unregister_extension(&audio_ops);
 509 }
 510
 511 module_init(tm6000_alsa_register);
 512 module_exit(tm6000_alsa_unregister);