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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  ALSA PCM device for the
   4  *  ALSA interface to cobalt PCM capture streams
   5  *
   6  *  Copyright 2014-2015 Cisco Systems, Inc. and/or its affiliates.
   7  *  All rights reserved.
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/delay.h>
  13
  14 #include <media/v4l2-device.h>
  15
  16 #include <sound/core.h>
  17 #include <sound/pcm.h>
  18
  19 #include "cobalt-driver.h"
  20 #include "cobalt-alsa.h"
  21 #include "cobalt-alsa-pcm.h"
  22
  23 static unsigned int pcm_debug;
  24 module_param(pcm_debug, int, 0644);
  25 MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm");
  26
  27 #define dprintk(fmt, arg...) \
  28         do { \
  29                 if (pcm_debug) \
  30                         pr_info("cobalt-alsa-pcm %s: " fmt, __func__, ##arg); \
  31         } while (0)
  32
  33 static const struct snd_pcm_hardware snd_cobalt_hdmi_capture = {
  34         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
  35                 SNDRV_PCM_INFO_MMAP           |
  36                 SNDRV_PCM_INFO_INTERLEAVED    |
  37                 SNDRV_PCM_INFO_MMAP_VALID,
  38
  39         .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE,
  40
  41         .rates = SNDRV_PCM_RATE_48000,
  42
  43         .rate_min = 48000,
  44         .rate_max = 48000,
  45         .channels_min = 1,
  46         .channels_max = 8,
  47         .buffer_bytes_max = 4 * 240 * 8 * 4,    /* 5 ms of data */
  48         .period_bytes_min = 1920,               /* 1 sample = 8 * 4 bytes */
  49         .period_bytes_max = 240 * 8 * 4,        /* 5 ms of 8 channel data */
  50         .periods_min = 1,
  51         .periods_max = 4,
  52 };
  53
  54 static const struct snd_pcm_hardware snd_cobalt_playback = {
  55         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
  56                 SNDRV_PCM_INFO_MMAP           |
  57                 SNDRV_PCM_INFO_INTERLEAVED    |
  58                 SNDRV_PCM_INFO_MMAP_VALID,
  59
  60         .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE,
  61
  62         .rates = SNDRV_PCM_RATE_48000,
  63
  64         .rate_min = 48000,
  65         .rate_max = 48000,
  66         .channels_min = 1,
  67         .channels_max = 8,
  68         .buffer_bytes_max = 4 * 240 * 8 * 4,    /* 5 ms of data */
  69         .period_bytes_min = 1920,               /* 1 sample = 8 * 4 bytes */
  70         .period_bytes_max = 240 * 8 * 4,        /* 5 ms of 8 channel data */
  71         .periods_min = 1,
  72         .periods_max = 4,
  73 };
  74
  75 static void sample_cpy(u8 *dst, const u8 *src, u32 len, bool is_s32)
  76 {
  77         static const unsigned map[8] = { 0, 1, 5, 4, 2, 3, 6, 7 };
  78         unsigned idx = 0;
  79
  80         while (len >= (is_s32 ? 4 : 2)) {
  81                 unsigned offset = map[idx] * 4;
  82                 u32 val = src[offset + 1] + (src[offset + 2] << 8) +
  83                          (src[offset + 3] << 16);
  84
  85                 if (is_s32) {
  86                         *dst++ = 0;
  87                         *dst++ = val & 0xff;
  88                 }
  89                 *dst++ = (val >> 8) & 0xff;
  90                 *dst++ = (val >> 16) & 0xff;
  91                 len -= is_s32 ? 4 : 2;
  92                 idx++;
  93         }
  94 }
  95
  96 static void cobalt_alsa_announce_pcm_data(struct snd_cobalt_card *cobsc,
  97                                         u8 *pcm_data,
  98                                         size_t skip,
  99                                         size_t samples)
 100 {
 101         struct snd_pcm_substream *substream;
 102         struct snd_pcm_runtime *runtime;
 103         unsigned long flags;
 104         unsigned int oldptr;
 105         unsigned int stride;
 106         int length = samples;
 107         int period_elapsed = 0;
 108         bool is_s32;
 109
 110         dprintk("cobalt alsa announce ptr=%p data=%p num_bytes=%zd\n", cobsc,
 111                 pcm_data, samples);
 112
 113         substream = cobsc->capture_pcm_substream;
 114         if (substream == NULL) {
 115                 dprintk("substream was NULL\n");
 116                 return;
 117         }
 118
 119         runtime = substream->runtime;
 120         if (runtime == NULL) {
 121                 dprintk("runtime was NULL\n");
 122                 return;
 123         }
 124         is_s32 = runtime->format == SNDRV_PCM_FORMAT_S32_LE;
 125
 126         stride = runtime->frame_bits >> 3;
 127         if (stride == 0) {
 128                 dprintk("stride is zero\n");
 129                 return;
 130         }
 131
 132         if (length == 0) {
 133                 dprintk("%s: length was zero\n", __func__);
 134                 return;
 135         }
 136
 137         if (runtime->dma_area == NULL) {
 138                 dprintk("dma area was NULL - ignoring\n");
 139                 return;
 140         }
 141
 142         oldptr = cobsc->hwptr_done_capture;
 143         if (oldptr + length >= runtime->buffer_size) {
 144                 unsigned int cnt = runtime->buffer_size - oldptr;
 145                 unsigned i;
 146
 147                 for (i = 0; i < cnt; i++)
 148                         sample_cpy(runtime->dma_area + (oldptr + i) * stride,
 149                                         pcm_data + i * skip,
 150                                         stride, is_s32);
 151                 for (i = cnt; i < length; i++)
 152                         sample_cpy(runtime->dma_area + (i - cnt) * stride,
 153                                         pcm_data + i * skip, stride, is_s32);
 154         } else {
 155                 unsigned i;
 156
 157                 for (i = 0; i < length; i++)
 158                         sample_cpy(runtime->dma_area + (oldptr + i) * stride,
 159                                         pcm_data + i * skip,
 160                                         stride, is_s32);
 161         }
 162         snd_pcm_stream_lock_irqsave(substream, flags);
 163
 164         cobsc->hwptr_done_capture += length;
 165         if (cobsc->hwptr_done_capture >=
 166             runtime->buffer_size)
 167                 cobsc->hwptr_done_capture -=
 168                         runtime->buffer_size;
 169
 170         cobsc->capture_transfer_done += length;
 171         if (cobsc->capture_transfer_done >=
 172             runtime->period_size) {
 173                 cobsc->capture_transfer_done -=
 174                         runtime->period_size;
 175                 period_elapsed = 1;
 176         }
 177
 178         snd_pcm_stream_unlock_irqrestore(substream, flags);
 179
 180         if (period_elapsed)
 181                 snd_pcm_period_elapsed(substream);
 182 }
 183
 184 static int alsa_fnc(struct vb2_buffer *vb, void *priv)
 185 {
 186         struct cobalt_stream *s = priv;
 187         unsigned char *p = vb2_plane_vaddr(vb, 0);
 188         int i;
 189
 190         if (pcm_debug) {
 191                 pr_info("alsa: ");
 192                 for (i = 0; i < 8 * 4; i++) {
 193                         if (!(i & 3))
 194                                 pr_cont(" ");
 195                         pr_cont("%02x", p[i]);
 196                 }
 197                 pr_cont("\n");
 198         }
 199         cobalt_alsa_announce_pcm_data(s->alsa,
 200                         vb2_plane_vaddr(vb, 0),
 201                         8 * 4,
 202                         vb2_get_plane_payload(vb, 0) / (8 * 4));
 203         return 0;
 204 }
 205
 206 static int snd_cobalt_pcm_capture_open(struct snd_pcm_substream *substream)
 207 {
 208         struct snd_pcm_runtime *runtime = substream->runtime;
 209         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 210         struct cobalt_stream *s = cobsc->s;
 211
 212         runtime->hw = snd_cobalt_hdmi_capture;
 213         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 214         cobsc->capture_pcm_substream = substream;
 215         runtime->private_data = s;
 216         cobsc->alsa_record_cnt++;
 217         if (cobsc->alsa_record_cnt == 1) {
 218                 int rc;
 219
 220                 rc = vb2_thread_start(&s->q, alsa_fnc, s, s->vdev.name);
 221                 if (rc) {
 222                         cobsc->alsa_record_cnt--;
 223                         return rc;
 224                 }
 225         }
 226         return 0;
 227 }
 228
 229 static int snd_cobalt_pcm_capture_close(struct snd_pcm_substream *substream)
 230 {
 231         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 232         struct cobalt_stream *s = cobsc->s;
 233
 234         cobsc->alsa_record_cnt--;
 235         if (cobsc->alsa_record_cnt == 0)
 236                 vb2_thread_stop(&s->q);
 237         return 0;
 238 }
 239
 240 static int snd_cobalt_pcm_prepare(struct snd_pcm_substream *substream)
 241 {
 242         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 243
 244         cobsc->hwptr_done_capture = 0;
 245         cobsc->capture_transfer_done = 0;
 246
 247         return 0;
 248 }
 249
 250 static int snd_cobalt_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 251 {
 252         switch (cmd) {
 253         case SNDRV_PCM_TRIGGER_START:
 254         case SNDRV_PCM_TRIGGER_STOP:
 255                 return 0;
 256         default:
 257                 return -EINVAL;
 258         }
 259         return 0;
 260 }
 261
 262 static
 263 snd_pcm_uframes_t snd_cobalt_pcm_pointer(struct snd_pcm_substream *substream)
 264 {
 265         snd_pcm_uframes_t hwptr_done;
 266         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 267
 268         hwptr_done = cobsc->hwptr_done_capture;
 269
 270         return hwptr_done;
 271 }
 272
 273 static void pb_sample_cpy(u8 *dst, const u8 *src, u32 len, bool is_s32)
 274 {
 275         static const unsigned map[8] = { 0, 1, 5, 4, 2, 3, 6, 7 };
 276         unsigned idx = 0;
 277
 278         while (len >= (is_s32 ? 4 : 2)) {
 279                 unsigned offset = map[idx] * 4;
 280                 u8 *out = dst + offset;
 281
 282                 *out++ = 0;
 283                 if (is_s32) {
 284                         src++;
 285                         *out++ = *src++;
 286                 } else {
 287                         *out++ = 0;
 288                 }
 289                 *out++ = *src++;
 290                 *out = *src++;
 291                 len -= is_s32 ? 4 : 2;
 292                 idx++;
 293         }
 294 }
 295
 296 static void cobalt_alsa_pb_pcm_data(struct snd_cobalt_card *cobsc,
 297                                         u8 *pcm_data,
 298                                         size_t skip,
 299                                         size_t samples)
 300 {
 301         struct snd_pcm_substream *substream;
 302         struct snd_pcm_runtime *runtime;
 303         unsigned long flags;
 304         unsigned int pos;
 305         unsigned int stride;
 306         bool is_s32;
 307         unsigned i;
 308
 309         dprintk("cobalt alsa pb ptr=%p data=%p samples=%zd\n", cobsc,
 310                 pcm_data, samples);
 311
 312         substream = cobsc->playback_pcm_substream;
 313         if (substream == NULL) {
 314                 dprintk("substream was NULL\n");
 315                 return;
 316         }
 317
 318         runtime = substream->runtime;
 319         if (runtime == NULL) {
 320                 dprintk("runtime was NULL\n");
 321                 return;
 322         }
 323
 324         is_s32 = runtime->format == SNDRV_PCM_FORMAT_S32_LE;
 325         stride = runtime->frame_bits >> 3;
 326         if (stride == 0) {
 327                 dprintk("stride is zero\n");
 328                 return;
 329         }
 330
 331         if (samples == 0) {
 332                 dprintk("%s: samples was zero\n", __func__);
 333                 return;
 334         }
 335
 336         if (runtime->dma_area == NULL) {
 337                 dprintk("dma area was NULL - ignoring\n");
 338                 return;
 339         }
 340
 341         pos = cobsc->pb_pos % cobsc->pb_size;
 342         for (i = 0; i < cobsc->pb_count / (8 * 4); i++)
 343                 pb_sample_cpy(pcm_data + i * skip,
 344                                 runtime->dma_area + pos + i * stride,
 345                                 stride, is_s32);
 346         snd_pcm_stream_lock_irqsave(substream, flags);
 347
 348         cobsc->pb_pos += i * stride;
 349
 350         snd_pcm_stream_unlock_irqrestore(substream, flags);
 351         if (cobsc->pb_pos % cobsc->pb_count == 0)
 352                 snd_pcm_period_elapsed(substream);
 353 }
 354
 355 static int alsa_pb_fnc(struct vb2_buffer *vb, void *priv)
 356 {
 357         struct cobalt_stream *s = priv;
 358
 359         if (s->alsa->alsa_pb_channel)
 360                 cobalt_alsa_pb_pcm_data(s->alsa,
 361                                 vb2_plane_vaddr(vb, 0),
 362                                 8 * 4,
 363                                 vb2_get_plane_payload(vb, 0) / (8 * 4));
 364         return 0;
 365 }
 366
 367 static int snd_cobalt_pcm_playback_open(struct snd_pcm_substream *substream)
 368 {
 369         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 370         struct snd_pcm_runtime *runtime = substream->runtime;
 371         struct cobalt_stream *s = cobsc->s;
 372
 373         runtime->hw = snd_cobalt_playback;
 374         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 375         cobsc->playback_pcm_substream = substream;
 376         runtime->private_data = s;
 377         cobsc->alsa_playback_cnt++;
 378         if (cobsc->alsa_playback_cnt == 1) {
 379                 int rc;
 380
 381                 rc = vb2_thread_start(&s->q, alsa_pb_fnc, s, s->vdev.name);
 382                 if (rc) {
 383                         cobsc->alsa_playback_cnt--;
 384                         return rc;
 385                 }
 386         }
 387
 388         return 0;
 389 }
 390
 391 static int snd_cobalt_pcm_playback_close(struct snd_pcm_substream *substream)
 392 {
 393         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 394         struct cobalt_stream *s = cobsc->s;
 395
 396         cobsc->alsa_playback_cnt--;
 397         if (cobsc->alsa_playback_cnt == 0)
 398                 vb2_thread_stop(&s->q);
 399         return 0;
 400 }
 401
 402 static int snd_cobalt_pcm_pb_prepare(struct snd_pcm_substream *substream)
 403 {
 404         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 405
 406         cobsc->pb_size = snd_pcm_lib_buffer_bytes(substream);
 407         cobsc->pb_count = snd_pcm_lib_period_bytes(substream);
 408         cobsc->pb_pos = 0;
 409
 410         return 0;
 411 }
 412
 413 static int snd_cobalt_pcm_pb_trigger(struct snd_pcm_substream *substream,
 414                                      int cmd)
 415 {
 416         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 417
 418         switch (cmd) {
 419         case SNDRV_PCM_TRIGGER_START:
 420                 if (cobsc->alsa_pb_channel)
 421                         return -EBUSY;
 422                 cobsc->alsa_pb_channel = true;
 423                 return 0;
 424         case SNDRV_PCM_TRIGGER_STOP:
 425                 cobsc->alsa_pb_channel = false;
 426                 return 0;
 427         default:
 428                 return -EINVAL;
 429         }
 430 }
 431
 432 static
 433 snd_pcm_uframes_t snd_cobalt_pcm_pb_pointer(struct snd_pcm_substream *substream)
 434 {
 435         struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
 436         size_t ptr;
 437
 438         ptr = cobsc->pb_pos;
 439
 440         return bytes_to_frames(substream->runtime, ptr) %
 441                substream->runtime->buffer_size;
 442 }
 443
 444 static const struct snd_pcm_ops snd_cobalt_pcm_capture_ops = {
 445         .open           = snd_cobalt_pcm_capture_open,
 446         .close          = snd_cobalt_pcm_capture_close,
 447         .prepare        = snd_cobalt_pcm_prepare,
 448         .trigger        = snd_cobalt_pcm_trigger,
 449         .pointer        = snd_cobalt_pcm_pointer,
 450 };
 451
 452 static const struct snd_pcm_ops snd_cobalt_pcm_playback_ops = {
 453         .open           = snd_cobalt_pcm_playback_open,
 454         .close          = snd_cobalt_pcm_playback_close,
 455         .prepare        = snd_cobalt_pcm_pb_prepare,
 456         .trigger        = snd_cobalt_pcm_pb_trigger,
 457         .pointer        = snd_cobalt_pcm_pb_pointer,
 458 };
 459
 460 int snd_cobalt_pcm_create(struct snd_cobalt_card *cobsc)
 461 {
 462         struct snd_pcm *sp;
 463         struct snd_card *sc = cobsc->sc;
 464         struct cobalt_stream *s = cobsc->s;
 465         struct cobalt *cobalt = s->cobalt;
 466         int ret;
 467
 468         s->q.gfp_flags |= __GFP_ZERO;
 469
 470         if (!s->is_output) {
 471                 cobalt_s_bit_sysctrl(cobalt,
 472                         COBALT_SYS_CTRL_AUDIO_IPP_RESETN_BIT(s->video_channel),
 473                         0);
 474                 mdelay(2);
 475                 cobalt_s_bit_sysctrl(cobalt,
 476                         COBALT_SYS_CTRL_AUDIO_IPP_RESETN_BIT(s->video_channel),
 477                         1);
 478                 mdelay(1);
 479
 480                 ret = snd_pcm_new(sc, "Cobalt PCM-In HDMI",
 481                         0, /* PCM device 0, the only one for this card */
 482                         0, /* 0 playback substreams */
 483                         1, /* 1 capture substream */
 484                         &sp);
 485                 if (ret) {
 486                         cobalt_err("snd_cobalt_pcm_create() failed for input with err %d\n",
 487                                    ret);
 488                         goto err_exit;
 489                 }
 490
 491                 snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE,
 492                                 &snd_cobalt_pcm_capture_ops);
 493                 snd_pcm_set_managed_buffer_all(sp, SNDRV_DMA_TYPE_VMALLOC,
 494                                                NULL, 0, 0);
 495                 sp->info_flags = 0;
 496                 sp->private_data = cobsc;
 497                 strscpy(sp->name, "cobalt", sizeof(sp->name));
 498         } else {
 499                 cobalt_s_bit_sysctrl(cobalt,
 500                         COBALT_SYS_CTRL_AUDIO_OPP_RESETN_BIT, 0);
 501                 mdelay(2);
 502                 cobalt_s_bit_sysctrl(cobalt,
 503                         COBALT_SYS_CTRL_AUDIO_OPP_RESETN_BIT, 1);
 504                 mdelay(1);
 505
 506                 ret = snd_pcm_new(sc, "Cobalt PCM-Out HDMI",
 507                         0, /* PCM device 0, the only one for this card */
 508                         1, /* 0 playback substreams */
 509                         0, /* 1 capture substream */
 510                         &sp);
 511                 if (ret) {
 512                         cobalt_err("snd_cobalt_pcm_create() failed for output with err %d\n",
 513                                    ret);
 514                         goto err_exit;
 515                 }
 516
 517                 snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_PLAYBACK,
 518                                 &snd_cobalt_pcm_playback_ops);
 519                 snd_pcm_set_managed_buffer_all(sp, SNDRV_DMA_TYPE_VMALLOC,
 520                                                NULL, 0, 0);
 521                 sp->info_flags = 0;
 522                 sp->private_data = cobsc;
 523                 strscpy(sp->name, "cobalt", sizeof(sp->name));
 524         }
 525
 526         return 0;
 527
 528 err_exit:
 529         return ret;
 530 }