drivers/media/pci/cobalt/cobalt-alsa-pcm.c

   1 /*
   2  *  ALSA PCM device for the
   3  *  ALSA interface to cobalt PCM capture streams
   4  *
   5  *  Copyright 2014-2015 Cisco Systems, Inc. and/or its affiliates.
   6  *  All rights reserved.
   7  *
   8  *  This program is free software; you may redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; version 2 of the License.
  11  *
  12  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  16  *  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  17  *  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  18  *  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  19  *  SOFTWARE.
  20  */
  21
  22 #include <linux/init.h>
  23 #include <linux/kernel.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/delay.h>
  26
  27 #include <media/v4l2-device.h>
  28
  29 #include <sound/core.h>
  30 #include <sound/pcm.h>
  31
  32 #include "cobalt-driver.h"
  33 #include "cobalt-alsa.h"
  34 #include "cobalt-alsa-pcm.h"
  35
  36 static unsigned int pcm_debug;
  37 module_param(pcm_debug, int, 0644);
  38 MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm");
  39
  40 #define dprintk(fmt, arg...) \
  41         do { \
  42                 if (pcm_debug) \
  43                         pr_info("cobalt-alsa-pcm %s: " fmt, __func__, ##arg); \
  44         } while (0)
  45
  46 static struct snd_pcm_hardware snd_cobalt_hdmi_capture = {
  47         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
  48                 SNDRV_PCM_INFO_MMAP           |
  49                 SNDRV_PCM_INFO_INTERLEAVED    |
  50                 SNDRV_PCM_INFO_MMAP_VALID,
  51
  52         .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE,
  53
  54         .rates = SNDRV_PCM_RATE_48000,
  55
  56         .rate_min = 48000,
  57         .rate_max = 48000,
  58         .channels_min = 1,
  59         .channels_max = 8,
  60         .buffer_bytes_max = 4 * 240 * 8 * 4,    /* 5 ms of data */
  61         .period_bytes_min = 1920,               /* 1 sample = 8 * 4 bytes */
  62         .period_bytes_max = 240 * 8 * 4,        /* 5 ms of 8 channel data */
  63         .periods_min = 1,
  64         .periods_max = 4,
  65 };
  66
  67 static struct snd_pcm_hardware snd_cobalt_playback = {
  68         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
  69                 SNDRV_PCM_INFO_MMAP           |
  70                 SNDRV_PCM_INFO_INTERLEAVED    |
  71                 SNDRV_PCM_INFO_MMAP_VALID,
  72
  73         .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE,
  74
  75         .rates = SNDRV_PCM_RATE_48000,
  76
  77         .rate_min = 48000,
  78         .rate_max = 48000,
  79         .channels_min = 1,
  80         .channels_max = 8,
  81         .buffer_bytes_max = 4 * 240 * 8 * 4,    /* 5 ms of data */
  82         .period_bytes_min = 1920,               /* 1 sample = 8 * 4 bytes */
  83         .period_bytes_max = 240 * 8 * 4,        /* 5 ms of 8 channel data */
  84         .periods_min = 1,
  85         .periods_max = 4,
  86 };
  87
  88 static void sample_cpy(u8 *dst, const u8 *src, u32 len, bool is_s32)
  89 {
  90         static const unsigned map[8] = { 0, 1, 5, 4, 2, 3, 6, 7 };
  91         unsigned idx = 0;
  92
  93         while (len >= (is_s32 ? 4 : 2)) {
  94                 unsigned offset = map[idx] * 4;
  95                 u32 val = src[offset + 1] + (src[offset + 2] << 8) +
  96                          (src[offset + 3] << 16);
  97
  98                 if (is_s32) {
  99                         *dst++ = 0;
 100                         *dst++ = val & 0xff;
 101                 }
 102                 *dst++ = (val >> 8) & 0xff;
 103                 *dst++ = (val >> 16) & 0xff;
 104                 len -= is_s32 ? 4 : 2;
 105                 idx++;
 106         }
 107 }
 108
 109 static void cobalt_alsa_announce_pcm_data(struct snd_cobalt_card *cobsc,
 110                                         u8 *pcm_data,
 111                                         size_t skip,
 112                                         size_t samples)
 113 {
 114         struct snd_pcm_substream *substream;
 115         struct snd_pcm_runtime *runtime;
 116         unsigned long flags;
 117         unsigned int oldptr;
 118         unsigned int stride;
 119         int length = samples;
 120         int period_elapsed = 0;
 121         bool is_s32;
 122
 123         dprintk("cobalt alsa announce ptr=%p data=%p num_bytes=%zd\n", cobsc,
 124                 pcm_data, samples);
 125
 126         substream = cobsc->capture_pcm_substream;
 127         if (substream == NULL) {
 128                 dprintk("substream was NULL\n");
 129                 return;
 130         }
 131
 132         runtime = substream->runtime;
 133         if (runtime == NULL) {
 134                 dprintk("runtime was NULL\n");
 135                 return;
 136         }
 137         is_s32 = runtime->format == SNDRV_PCM_FORMAT_S32_LE;
 138
 139         stride = runtime->frame_bits >> 3;
 140         if (stride == 0) {
 141                 dprintk("stride is zero\n");
 142                 return;
 143         }
 144
 145         if (length == 0) {
 146                 dprintk("%s: length was zero\n", __func__);
 147                 return;
 148         }
 149
 150         if (runtime->dma_area == NULL) {
 151                 dprintk("dma area was NULL - ignoring\n");
 152                 return;
 153         }
 154
 155         oldptr = cobsc->hwptr_done_capture;
 156         if (oldptr + length >= runtime->buffer_size) {
 157                 unsigned int cnt = runtime->buffer_size - oldptr;
 158                 unsigned i;
 159
 160                 for (i = 0; i < cnt; i++)
 161                         sample_cpy(runtime->dma_area + (oldptr + i) * stride,
 162                                         pcm_data + i * skip,
 163                                         stride, is_s32);
 164                 for (i = cnt; i < length; i++)
 165                         sample_cpy(runtime->dma_area + (i - cnt) * stride,
 166                                         pcm_data + i * skip, stride, is_s32);
 167         } else {
 168                 unsigned i;
 169
 170                 for (i = 0; i < length; i++)
 171                         sample_cpy(runtime->dma_area + (oldptr + i) * stride,
 172                                         pcm_data + i * skip,
 173                                         stride, is_s32);
 174         }
 175         snd_pcm_stream_lock_irqsave(substream, flags);
 176
 177         cobsc->hwptr_done_capture += length;
 178         if (cobsc->hwptr_done_capture >=
 179             runtime->buffer_size)
 180                 cobsc->hwptr_done_capture -=
 181                         runtime->buffer_size;
 182
 183         cobsc->capture_transfer_done += length;
 184         if (cobsc->capture_transfer_done >=
 185             runtime->period_size) {
 186                 cobsc->capture_transfer_done -=
 187                         runtime->period_size;
 188                 period_elapsed = 1;
 189         }
 190
 191         snd_pcm_stream_unlock_irqrestore(substream, flags);
 192
 193         if (period_elapsed)
 194                 snd_pcm_period_elapsed(substream);
 195 }
 196
 197 static int alsa_fnc(struct vb2_buffer *vb, void *priv)
 198 {
 199         struct cobalt_stream *s = priv;
 200         unsigned char *p = vb2_plane_vaddr(vb, 0);
 201         int i;
 202
 203         if (pcm_debug) {
 204                 pr_info("alsa: ");
 205                 for (i = 0; i < 8 * 4; i++) {
 206                         if (!(i & 3))
 207                                 pr_cont(" ");
 208                         pr_cont("%02x", p[i]);
 209                 }
 210                 pr_cont("\n");
 211         }
 212         cobalt_alsa_announce_pcm_data(s->alsa,
 213                         vb2_plane_vaddr(vb, 0),
 214                         8 * 4,
 215                         vb2_get_plane_payload(vb, 0) / (8 * 4));
 216         return 0;
 217 }
 218
 219 static int snd_cobalt_pcm_capture_open(struct snd_pcm_substream *substream)
 220 {
 221         struct snd_pcm_runtime *runtime = substream->runtime;
 222         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 223         struct cobalt_stream *s = cobsc->s;
 224
 225         runtime->hw = snd_cobalt_hdmi_capture;
 226         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 227         cobsc->capture_pcm_substream = substream;
 228         runtime->private_data = s;
 229         cobsc->alsa_record_cnt++;
 230         if (cobsc->alsa_record_cnt == 1) {
 231                 int rc;
 232
 233                 rc = vb2_thread_start(&s->q, alsa_fnc, s, s->vdev.name);
 234                 if (rc) {
 235                         cobsc->alsa_record_cnt--;
 236                         return rc;
 237                 }
 238         }
 239         return 0;
 240 }
 241
 242 static int snd_cobalt_pcm_capture_close(struct snd_pcm_substream *substream)
 243 {
 244         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 245         struct cobalt_stream *s = cobsc->s;
 246
 247         cobsc->alsa_record_cnt--;
 248         if (cobsc->alsa_record_cnt == 0)
 249                 vb2_thread_stop(&s->q);
 250         return 0;
 251 }
 252
 253 static int snd_cobalt_pcm_ioctl(struct snd_pcm_substream *substream,
 254                      unsigned int cmd, void *arg)
 255 {
 256         return snd_pcm_lib_ioctl(substream, cmd, arg);
 257 }
 258
 259
 260 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 261                                         size_t size)
 262 {
 263         struct snd_pcm_runtime *runtime = subs->runtime;
 264
 265         dprintk("Allocating vbuffer\n");
 266         if (runtime->dma_area) {
 267                 if (runtime->dma_bytes > size)
 268                         return 0;
 269
 270                 vfree(runtime->dma_area);
 271         }
 272         runtime->dma_area = vmalloc(size);
 273         if (!runtime->dma_area)
 274                 return -ENOMEM;
 275
 276         runtime->dma_bytes = size;
 277
 278         return 0;
 279 }
 280
 281 static int snd_cobalt_pcm_hw_params(struct snd_pcm_substream *substream,
 282                          struct snd_pcm_hw_params *params)
 283 {
 284         dprintk("%s called\n", __func__);
 285
 286         return snd_pcm_alloc_vmalloc_buffer(substream,
 287                                            params_buffer_bytes(params));
 288 }
 289
 290 static int snd_cobalt_pcm_hw_free(struct snd_pcm_substream *substream)
 291 {
 292         if (substream->runtime->dma_area) {
 293                 dprintk("freeing pcm capture region\n");
 294                 vfree(substream->runtime->dma_area);
 295                 substream->runtime->dma_area = NULL;
 296         }
 297
 298         return 0;
 299 }
 300
 301 static int snd_cobalt_pcm_prepare(struct snd_pcm_substream *substream)
 302 {
 303         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 304
 305         cobsc->hwptr_done_capture = 0;
 306         cobsc->capture_transfer_done = 0;
 307
 308         return 0;
 309 }
 310
 311 static int snd_cobalt_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 312 {
 313         switch (cmd) {
 314         case SNDRV_PCM_TRIGGER_START:
 315         case SNDRV_PCM_TRIGGER_STOP:
 316                 return 0;
 317         default:
 318                 return -EINVAL;
 319         }
 320         return 0;
 321 }
 322
 323 static
 324 snd_pcm_uframes_t snd_cobalt_pcm_pointer(struct snd_pcm_substream *substream)
 325 {
 326         snd_pcm_uframes_t hwptr_done;
 327         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 328
 329         hwptr_done = cobsc->hwptr_done_capture;
 330
 331         return hwptr_done;
 332 }
 333
 334 static void pb_sample_cpy(u8 *dst, const u8 *src, u32 len, bool is_s32)
 335 {
 336         static const unsigned map[8] = { 0, 1, 5, 4, 2, 3, 6, 7 };
 337         unsigned idx = 0;
 338
 339         while (len >= (is_s32 ? 4 : 2)) {
 340                 unsigned offset = map[idx] * 4;
 341                 u8 *out = dst + offset;
 342
 343                 *out++ = 0;
 344                 if (is_s32) {
 345                         src++;
 346                         *out++ = *src++;
 347                 } else {
 348                         *out++ = 0;
 349                 }
 350                 *out++ = *src++;
 351                 *out = *src++;
 352                 len -= is_s32 ? 4 : 2;
 353                 idx++;
 354         }
 355 }
 356
 357 static void cobalt_alsa_pb_pcm_data(struct snd_cobalt_card *cobsc,
 358                                         u8 *pcm_data,
 359                                         size_t skip,
 360                                         size_t samples)
 361 {
 362         struct snd_pcm_substream *substream;
 363         struct snd_pcm_runtime *runtime;
 364         unsigned long flags;
 365         unsigned int pos;
 366         unsigned int stride;
 367         bool is_s32;
 368         unsigned i;
 369
 370         dprintk("cobalt alsa pb ptr=%p data=%p samples=%zd\n", cobsc,
 371                 pcm_data, samples);
 372
 373         substream = cobsc->playback_pcm_substream;
 374         if (substream == NULL) {
 375                 dprintk("substream was NULL\n");
 376                 return;
 377         }
 378
 379         runtime = substream->runtime;
 380         if (runtime == NULL) {
 381                 dprintk("runtime was NULL\n");
 382                 return;
 383         }
 384
 385         is_s32 = runtime->format == SNDRV_PCM_FORMAT_S32_LE;
 386         stride = runtime->frame_bits >> 3;
 387         if (stride == 0) {
 388                 dprintk("stride is zero\n");
 389                 return;
 390         }
 391
 392         if (samples == 0) {
 393                 dprintk("%s: samples was zero\n", __func__);
 394                 return;
 395         }
 396
 397         if (runtime->dma_area == NULL) {
 398                 dprintk("dma area was NULL - ignoring\n");
 399                 return;
 400         }
 401
 402         pos = cobsc->pb_pos % cobsc->pb_size;
 403         for (i = 0; i < cobsc->pb_count / (8 * 4); i++)
 404                 pb_sample_cpy(pcm_data + i * skip,
 405                                 runtime->dma_area + pos + i * stride,
 406                                 stride, is_s32);
 407         snd_pcm_stream_lock_irqsave(substream, flags);
 408
 409         cobsc->pb_pos += i * stride;
 410
 411         snd_pcm_stream_unlock_irqrestore(substream, flags);
 412         if (cobsc->pb_pos % cobsc->pb_count == 0)
 413                 snd_pcm_period_elapsed(substream);
 414 }
 415
 416 static int alsa_pb_fnc(struct vb2_buffer *vb, void *priv)
 417 {
 418         struct cobalt_stream *s = priv;
 419
 420         if (s->alsa->alsa_pb_channel)
 421                 cobalt_alsa_pb_pcm_data(s->alsa,
 422                                 vb2_plane_vaddr(vb, 0),
 423                                 8 * 4,
 424                                 vb2_get_plane_payload(vb, 0) / (8 * 4));
 425         return 0;
 426 }
 427
 428 static int snd_cobalt_pcm_playback_open(struct snd_pcm_substream *substream)
 429 {
 430         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 431         struct snd_pcm_runtime *runtime = substream->runtime;
 432         struct cobalt_stream *s = cobsc->s;
 433
 434         runtime->hw = snd_cobalt_playback;
 435         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 436         cobsc->playback_pcm_substream = substream;
 437         runtime->private_data = s;
 438         cobsc->alsa_playback_cnt++;
 439         if (cobsc->alsa_playback_cnt == 1) {
 440                 int rc;
 441
 442                 rc = vb2_thread_start(&s->q, alsa_pb_fnc, s, s->vdev.name);
 443                 if (rc) {
 444                         cobsc->alsa_playback_cnt--;
 445                         return rc;
 446                 }
 447         }
 448
 449         return 0;
 450 }
 451
 452 static int snd_cobalt_pcm_playback_close(struct snd_pcm_substream *substream)
 453 {
 454         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 455         struct cobalt_stream *s = cobsc->s;
 456
 457         cobsc->alsa_playback_cnt--;
 458         if (cobsc->alsa_playback_cnt == 0)
 459                 vb2_thread_stop(&s->q);
 460         return 0;
 461 }
 462
 463 static int snd_cobalt_pcm_pb_prepare(struct snd_pcm_substream *substream)
 464 {
 465         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 466
 467         cobsc->pb_size = snd_pcm_lib_buffer_bytes(substream);
 468         cobsc->pb_count = snd_pcm_lib_period_bytes(substream);
 469         cobsc->pb_pos = 0;
 470
 471         return 0;
 472 }
 473
 474 static int snd_cobalt_pcm_pb_trigger(struct snd_pcm_substream *substream,
 475                                      int cmd)
 476 {
 477         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 478
 479         switch (cmd) {
 480         case SNDRV_PCM_TRIGGER_START:
 481                 if (cobsc->alsa_pb_channel)
 482                         return -EBUSY;
 483                 cobsc->alsa_pb_channel = true;
 484                 return 0;
 485         case SNDRV_PCM_TRIGGER_STOP:
 486                 cobsc->alsa_pb_channel = false;
 487                 return 0;
 488         default:
 489                 return -EINVAL;
 490         }
 491 }
 492
 493 static
 494 snd_pcm_uframes_t snd_cobalt_pcm_pb_pointer(struct snd_pcm_substream *substream)
 495 {
 496         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 497         size_t ptr;
 498
 499         ptr = cobsc->pb_pos;
 500
 501         return bytes_to_frames(substream->runtime, ptr) %
 502                substream->runtime->buffer_size;
 503 }
 504
 505 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 506                                              unsigned long offset)
 507 {
 508         void *pageptr = subs->runtime->dma_area + offset;
 509
 510         return vmalloc_to_page(pageptr);
 511 }
 512
 513 static struct snd_pcm_ops snd_cobalt_pcm_capture_ops = {
 514         .open           = snd_cobalt_pcm_capture_open,
 515         .close          = snd_cobalt_pcm_capture_close,
 516         .ioctl          = snd_cobalt_pcm_ioctl,
 517         .hw_params      = snd_cobalt_pcm_hw_params,
 518         .hw_free        = snd_cobalt_pcm_hw_free,
 519         .prepare        = snd_cobalt_pcm_prepare,
 520         .trigger        = snd_cobalt_pcm_trigger,
 521         .pointer        = snd_cobalt_pcm_pointer,
 522         .page           = snd_pcm_get_vmalloc_page,
 523 };
 524
 525 static struct snd_pcm_ops snd_cobalt_pcm_playback_ops = {
 526         .open           = snd_cobalt_pcm_playback_open,
 527         .close          = snd_cobalt_pcm_playback_close,
 528         .ioctl          = snd_cobalt_pcm_ioctl,
 529         .hw_params      = snd_cobalt_pcm_hw_params,
 530         .hw_free        = snd_cobalt_pcm_hw_free,
 531         .prepare        = snd_cobalt_pcm_pb_prepare,
 532         .trigger        = snd_cobalt_pcm_pb_trigger,
 533         .pointer        = snd_cobalt_pcm_pb_pointer,
 534         .page           = snd_pcm_get_vmalloc_page,
 535 };
 536
 537 int snd_cobalt_pcm_create(struct snd_cobalt_card *cobsc)
 538 {
 539         struct snd_pcm *sp;
 540         struct snd_card *sc = cobsc->sc;
 541         struct cobalt_stream *s = cobsc->s;
 542         struct cobalt *cobalt = s->cobalt;
 543         int ret;
 544
 545         s->q.gfp_flags |= __GFP_ZERO;
 546
 547         if (!s->is_output) {
 548                 cobalt_s_bit_sysctrl(cobalt,
 549                         COBALT_SYS_CTRL_AUDIO_IPP_RESETN_BIT(s->video_channel),
 550                         0);
 551                 mdelay(2);
 552                 cobalt_s_bit_sysctrl(cobalt,
 553                         COBALT_SYS_CTRL_AUDIO_IPP_RESETN_BIT(s->video_channel),
 554                         1);
 555                 mdelay(1);
 556
 557                 ret = snd_pcm_new(sc, "Cobalt PCM-In HDMI",
 558                         0, /* PCM device 0, the only one for this card */
 559                         0, /* 0 playback substreams */
 560                         1, /* 1 capture substream */
 561                         &sp);
 562                 if (ret) {
 563                         cobalt_err("snd_cobalt_pcm_create() failed for input with err %d\n",
 564                                    ret);
 565                         goto err_exit;
 566                 }
 567
 568                 snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE,
 569                                 &snd_cobalt_pcm_capture_ops);
 570                 sp->info_flags = 0;
 571                 sp->private_data = cobsc;
 572                 strlcpy(sp->name, "cobalt", sizeof(sp->name));
 573         } else {
 574                 cobalt_s_bit_sysctrl(cobalt,
 575                         COBALT_SYS_CTRL_AUDIO_OPP_RESETN_BIT, 0);
 576                 mdelay(2);
 577                 cobalt_s_bit_sysctrl(cobalt,
 578                         COBALT_SYS_CTRL_AUDIO_OPP_RESETN_BIT, 1);
 579                 mdelay(1);
 580
 581                 ret = snd_pcm_new(sc, "Cobalt PCM-Out HDMI",
 582                         0, /* PCM device 0, the only one for this card */
 583                         1, /* 0 playback substreams */
 584                         0, /* 1 capture substream */
 585                         &sp);
 586                 if (ret) {
 587                         cobalt_err("snd_cobalt_pcm_create() failed for output with err %d\n",
 588                                    ret);
 589                         goto err_exit;
 590                 }
 591
 592                 snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_PLAYBACK,
 593                                 &snd_cobalt_pcm_playback_ops);
 594                 sp->info_flags = 0;
 595                 sp->private_data = cobsc;
 596                 strlcpy(sp->name, "cobalt", sizeof(sp->name));
 597         }
 598
 599         return 0;
 600
 601 err_exit:
 602         return ret;
 603 }