target/linux/brcm2708/patches-3.14/0010-alsa-add-mmap-support-and-some-cleanups-to-bcm2835-A.patch

   1 From 00d2b7bf3cd58d9735f103ff4cc6982b7dc927fe Mon Sep 17 00:00:00 2001
   2 From: popcornmix <popcornmix@gmail.com>
   3 Date: Fri, 26 Apr 2013 10:08:31 -0700
   4 Subject: [PATCH 10/54] alsa: add mmap support and some cleanups to bcm2835
   5  ALSA driver
   6
   7 ---
   8  sound/arm/bcm2835-pcm.c   | 69 ++++++++++++++++++++++--------------
   9  sound/arm/bcm2835-vchiq.c | 89 +++++++++++++++++++++++++++++++++--------------
  10  sound/arm/bcm2835.c       | 34 +++++++++---------
  11  sound/arm/bcm2835.h       |  2 ++
  12  4 files changed, 124 insertions(+), 70 deletions(-)
  13
  14 diff --git a/sound/arm/bcm2835-pcm.c b/sound/arm/bcm2835-pcm.c
  15 index 2e7d405..b4084bb 100755
  16 --- a/sound/arm/bcm2835-pcm.c
  17 +++ b/sound/arm/bcm2835-pcm.c
  18 @@ -19,7 +19,8 @@
  19
  20  /* hardware definition */
  21  static struct snd_pcm_hardware snd_bcm2835_playback_hw = {
  22 -       .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER),
  23 +       .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
  24 +                SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
  25         .formats = SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
  26         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
  27         .rate_min = 8000,
  28 @@ -251,6 +252,12 @@ static int snd_bcm2835_pcm_prepare(struct snd_pcm_substream *substream)
  29
  30         audio_info(" .. IN\n");
  31
  32 +       memset(&alsa_stream->pcm_indirect, 0, sizeof(alsa_stream->pcm_indirect));
  33 +
  34 +       alsa_stream->pcm_indirect.hw_buffer_size =
  35 +       alsa_stream->pcm_indirect.sw_buffer_size =
  36 +               snd_pcm_lib_buffer_bytes(substream);
  37 +
  38         alsa_stream->buffer_size = snd_pcm_lib_buffer_bytes(substream);
  39         alsa_stream->period_size = snd_pcm_lib_period_bytes(substream);
  40         alsa_stream->pos = 0;
  41 @@ -263,6 +270,32 @@ static int snd_bcm2835_pcm_prepare(struct snd_pcm_substream *substream)
  42         return 0;
  43  }
  44
  45 +static void snd_bcm2835_pcm_transfer(struct snd_pcm_substream *substream,
  46 +                                   struct snd_pcm_indirect *rec, size_t bytes)
  47 +{
  48 +       struct snd_pcm_runtime *runtime = substream->runtime;
  49 +       bcm2835_alsa_stream_t *alsa_stream = runtime->private_data;
  50 +       void *src = (void *)(substream->runtime->dma_area + rec->sw_data);
  51 +       int err;
  52 +
  53 +       err = bcm2835_audio_write(alsa_stream, bytes, src);
  54 +       if (err)
  55 +               audio_error(" Failed to transfer to alsa device (%d)\n", err);
  56 +
  57 +}
  58 +
  59 +static int snd_bcm2835_pcm_ack(struct snd_pcm_substream *substream)
  60 +{
  61 +       struct snd_pcm_runtime *runtime = substream->runtime;
  62 +       bcm2835_alsa_stream_t *alsa_stream = runtime->private_data;
  63 +       struct snd_pcm_indirect *pcm_indirect = &alsa_stream->pcm_indirect;
  64 +
  65 +       pcm_indirect->hw_queue_size = runtime->hw.buffer_bytes_max;
  66 +       snd_pcm_indirect_playback_transfer(substream, pcm_indirect,
  67 +                                          snd_bcm2835_pcm_transfer);
  68 +       return 0;
  69 +}
  70 +
  71  /* trigger callback */
  72  static int snd_bcm2835_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
  73  {
  74 @@ -279,6 +312,11 @@ static int snd_bcm2835_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
  75                 if (!alsa_stream->running) {
  76                         err = bcm2835_audio_start(alsa_stream);
  77                         if (err == 0) {
  78 +                               alsa_stream->pcm_indirect.hw_io =
  79 +                               alsa_stream->pcm_indirect.hw_data =
  80 +                                       bytes_to_frames(runtime,
  81 +                                                       alsa_stream->pos);
  82 +                               substream->ops->ack(substream);
  83                                 alsa_stream->running = 1;
  84                                 alsa_stream->draining = 1;
  85                         } else {
  86 @@ -327,30 +365,9 @@ snd_bcm2835_pcm_pointer(struct snd_pcm_substream *substream)
  87                       alsa_stream->pos);
  88
  89         audio_info(" .. OUT\n");
  90 -       return bytes_to_frames(runtime, alsa_stream->pos);
  91 -}
  92 -
  93 -static int snd_bcm2835_pcm_copy(struct snd_pcm_substream *substream,
  94 -                               int channel, snd_pcm_uframes_t pos, void *src,
  95 -                               snd_pcm_uframes_t count)
  96 -{
  97 -       int ret;
  98 -       struct snd_pcm_runtime *runtime = substream->runtime;
  99 -       bcm2835_alsa_stream_t *alsa_stream = runtime->private_data;
 100 -
 101 -       audio_info(" .. IN\n");
 102 -       audio_debug("copy.......... (%d) hwptr=%d appl=%d pos=%d\n",
 103 -                     frames_to_bytes(runtime, count), frames_to_bytes(runtime,
 104 -                                                                      runtime->
 105 -                                                                      status->
 106 -                                                                      hw_ptr),
 107 -                     frames_to_bytes(runtime, runtime->control->appl_ptr),
 108 -                     alsa_stream->pos);
 109 -       ret =
 110 -           bcm2835_audio_write(alsa_stream, frames_to_bytes(runtime, count),
 111 -                               src);
 112 -       audio_info(" .. OUT\n");
 113 -       return ret;
 114 +       return snd_pcm_indirect_playback_pointer(substream,
 115 +                                                &alsa_stream->pcm_indirect,
 116 +                                                alsa_stream->pos);
 117  }
 118
 119  static int snd_bcm2835_pcm_lib_ioctl(struct snd_pcm_substream *substream,
 120 @@ -372,7 +389,7 @@ static struct snd_pcm_ops snd_bcm2835_playback_ops = {
 121         .prepare = snd_bcm2835_pcm_prepare,
 122         .trigger = snd_bcm2835_pcm_trigger,
 123         .pointer = snd_bcm2835_pcm_pointer,
 124 -       .copy = snd_bcm2835_pcm_copy,
 125 +       .ack = snd_bcm2835_pcm_ack,
 126  };
 127
 128  /* create a pcm device */
 129 diff --git a/sound/arm/bcm2835-vchiq.c b/sound/arm/bcm2835-vchiq.c
 130 index b9b4fe8..ee09b13 100755
 131 --- a/sound/arm/bcm2835-vchiq.c
 132 +++ b/sound/arm/bcm2835-vchiq.c
 133 @@ -27,6 +27,7 @@
 134  #include <linux/delay.h>
 135  #include <linux/atomic.h>
 136  #include <linux/module.h>
 137 +#include <linux/completion.h>
 138
 139  #include "bcm2835.h"
 140
 141 @@ -37,6 +38,10 @@
 142
 143  /* ---- Private Constants and Types ------------------------------------------ */
 144
 145 +#define BCM2835_AUDIO_STOP           0
 146 +#define BCM2835_AUDIO_START          1
 147 +#define BCM2835_AUDIO_WRITE          2
 148 +
 149  /* Logging macros (for remapping to other logging mechanisms, i.e., printf) */
 150  #ifdef AUDIO_DEBUG_ENABLE
 151         #define LOG_ERR( fmt, arg... )   pr_err( "%s:%d " fmt, __func__, __LINE__, ##arg)
 152 @@ -53,7 +58,7 @@
 153  typedef struct opaque_AUDIO_INSTANCE_T {
 154         uint32_t num_connections;
 155         VCHI_SERVICE_HANDLE_T vchi_handle[VCHI_MAX_NUM_CONNECTIONS];
 156 -       struct semaphore msg_avail_event;
 157 +       struct completion msg_avail_comp;
 158         struct mutex vchi_mutex;
 159         bcm2835_alsa_stream_t *alsa_stream;
 160         int32_t result;
 161 @@ -70,27 +75,35 @@ bool force_bulk = false;
 162
 163  static int bcm2835_audio_stop_worker(bcm2835_alsa_stream_t * alsa_stream);
 164  static int bcm2835_audio_start_worker(bcm2835_alsa_stream_t * alsa_stream);
 165 +static int bcm2835_audio_write_worker(bcm2835_alsa_stream_t *alsa_stream,
 166 +                                     uint32_t count, void *src);
 167
 168  typedef struct {
 169         struct work_struct my_work;
 170         bcm2835_alsa_stream_t *alsa_stream;
 171 -       int x;
 172 +       int cmd;
 173 +       void *src;
 174 +       uint32_t count;
 175  } my_work_t;
 176
 177  static void my_wq_function(struct work_struct *work)
 178  {
 179         my_work_t *w = (my_work_t *) work;
 180         int ret = -9;
 181 -       LOG_DBG(" .. IN %p:%d\n", w->alsa_stream, w->x);
 182 -       switch (w->x) {
 183 -       case 1:
 184 +       LOG_DBG(" .. IN %p:%d\n", w->alsa_stream, w->cmd);
 185 +       switch (w->cmd) {
 186 +       case BCM2835_AUDIO_START:
 187                 ret = bcm2835_audio_start_worker(w->alsa_stream);
 188                 break;
 189 -       case 2:
 190 +       case BCM2835_AUDIO_STOP:
 191                 ret = bcm2835_audio_stop_worker(w->alsa_stream);
 192                 break;
 193 +       case BCM2835_AUDIO_WRITE:
 194 +               ret = bcm2835_audio_write_worker(w->alsa_stream, w->count,
 195 +                                                w->src);
 196 +               break;
 197         default:
 198 -               LOG_ERR(" Unexpected work: %p:%d\n", w->alsa_stream, w->x);
 199 +               LOG_ERR(" Unexpected work: %p:%d\n", w->alsa_stream, w->cmd);
 200                 break;
 201         }
 202         kfree((void *)work);
 203 @@ -107,7 +120,7 @@ int bcm2835_audio_start(bcm2835_alsa_stream_t * alsa_stream)
 204                 if (work) {
 205                         INIT_WORK((struct work_struct *)work, my_wq_function);
 206                         work->alsa_stream = alsa_stream;
 207 -                       work->x = 1;
 208 +                       work->cmd = BCM2835_AUDIO_START;
 209                         if (queue_work
 210                             (alsa_stream->my_wq, (struct work_struct *)work))
 211                                 ret = 0;
 212 @@ -128,7 +141,31 @@ int bcm2835_audio_stop(bcm2835_alsa_stream_t * alsa_stream)
 213                 if (work) {
 214                         INIT_WORK((struct work_struct *)work, my_wq_function);
 215                         work->alsa_stream = alsa_stream;
 216 -                       work->x = 2;
 217 +                       work->cmd = BCM2835_AUDIO_STOP;
 218 +                       if (queue_work
 219 +                           (alsa_stream->my_wq, (struct work_struct *)work))
 220 +                               ret = 0;
 221 +               } else
 222 +                       LOG_ERR(" .. Error: NULL work kmalloc\n");
 223 +       }
 224 +       LOG_DBG(" .. OUT %d\n", ret);
 225 +       return ret;
 226 +}
 227 +
 228 +int bcm2835_audio_write(bcm2835_alsa_stream_t *alsa_stream,
 229 +                       uint32_t count, void *src)
 230 +{
 231 +       int ret = -1;
 232 +       LOG_DBG(" .. IN\n");
 233 +       if (alsa_stream->my_wq) {
 234 +               my_work_t *work = kmalloc(sizeof(my_work_t), GFP_ATOMIC);
 235 +                /*--- Queue some work (item 1) ---*/
 236 +               if (work) {
 237 +                       INIT_WORK((struct work_struct *)work, my_wq_function);
 238 +                       work->alsa_stream = alsa_stream;
 239 +                       work->cmd = BCM2835_AUDIO_WRITE;
 240 +                       work->src = src;
 241 +                       work->count = count;
 242                         if (queue_work
 243                             (alsa_stream->my_wq, (struct work_struct *)work))
 244                                 ret = 0;
 245 @@ -178,7 +215,7 @@ static void audio_vchi_callback(void *param,
 246                     (" .. instance=%p, m.type=VC_AUDIO_MSG_TYPE_RESULT, success=%d\n",
 247                      instance, m.u.result.success);
 248                 instance->result = m.u.result.success;
 249 -               up(&instance->msg_avail_event);
 250 +               complete(&instance->msg_avail_comp);
 251         } else if (m.type == VC_AUDIO_MSG_TYPE_COMPLETE) {
 252                 irq_handler_t callback = (irq_handler_t) m.u.complete.callback;
 253                 LOG_DBG
 254 @@ -435,8 +472,8 @@ static int bcm2835_audio_set_ctls_chan(bcm2835_alsa_stream_t * alsa_stream,
 255         m.u.control.dest = chip->dest;
 256         m.u.control.volume = chip->volume;
 257
 258 -       /* Create the message available event */
 259 -       sema_init(&instance->msg_avail_event, 0);
 260 +       /* Create the message available completion */
 261 +       init_completion(&instance->msg_avail_comp);
 262
 263         /* Send the message to the videocore */
 264         success = vchi_msg_queue(instance->vchi_handle[0],
 265 @@ -452,11 +489,10 @@ static int bcm2835_audio_set_ctls_chan(bcm2835_alsa_stream_t * alsa_stream,
 266         }
 267
 268         /* We are expecting a reply from the videocore */
 269 -       if (down_interruptible(&instance->msg_avail_event)) {
 270 +       ret = wait_for_completion_interruptible(&instance->msg_avail_comp);
 271 +       if (ret) {
 272                 LOG_ERR("%s: failed on waiting for event (status=%d)\n",
 273                         __func__, success);
 274 -
 275 -               ret = -1;
 276                 goto unlock;
 277         }
 278
 279 @@ -539,8 +575,8 @@ int bcm2835_audio_set_params(bcm2835_alsa_stream_t * alsa_stream,
 280         m.u.config.samplerate = samplerate;
 281         m.u.config.bps = bps;
 282
 283 -       /* Create the message available event */
 284 -       sema_init(&instance->msg_avail_event, 0);
 285 +       /* Create the message available completion */
 286 +       init_completion(&instance->msg_avail_comp);
 287
 288         /* Send the message to the videocore */
 289         success = vchi_msg_queue(instance->vchi_handle[0],
 290 @@ -556,11 +592,10 @@ int bcm2835_audio_set_params(bcm2835_alsa_stream_t * alsa_stream,
 291         }
 292
 293         /* We are expecting a reply from the videocore */
 294 -       if (down_interruptible(&instance->msg_avail_event)) {
 295 +       ret = wait_for_completion_interruptible(&instance->msg_avail_comp);
 296 +       if (ret) {
 297                 LOG_ERR("%s: failed on waiting for event (status=%d)\n",
 298                         __func__, success);
 299 -
 300 -               ret = -1;
 301                 goto unlock;
 302         }
 303
 304 @@ -688,8 +723,8 @@ int bcm2835_audio_close(bcm2835_alsa_stream_t * alsa_stream)
 305
 306         m.type = VC_AUDIO_MSG_TYPE_CLOSE;
 307
 308 -       /* Create the message available event */
 309 -       sema_init(&instance->msg_avail_event, 0);
 310 +       /* Create the message available completion */
 311 +       init_completion(&instance->msg_avail_comp);
 312
 313         /* Send the message to the videocore */
 314         success = vchi_msg_queue(instance->vchi_handle[0],
 315 @@ -702,11 +737,11 @@ int bcm2835_audio_close(bcm2835_alsa_stream_t * alsa_stream)
 316                 ret = -1;
 317                 goto unlock;
 318         }
 319 -       if (down_interruptible(&instance->msg_avail_event)) {
 320 +
 321 +       ret = wait_for_completion_interruptible(&instance->msg_avail_comp);
 322 +       if (ret) {
 323                 LOG_ERR("%s: failed on waiting for event (status=%d)",
 324                         __func__, success);
 325 -
 326 -               ret = -1;
 327                 goto unlock;
 328         }
 329         if (instance->result != 0) {
 330 @@ -732,8 +767,8 @@ unlock:
 331         return ret;
 332  }
 333
 334 -int bcm2835_audio_write(bcm2835_alsa_stream_t * alsa_stream, uint32_t count,
 335 -                       void *src)
 336 +int bcm2835_audio_write_worker(bcm2835_alsa_stream_t *alsa_stream,
 337 +                              uint32_t count, void *src)
 338  {
 339         VC_AUDIO_MSG_T m;
 340         AUDIO_INSTANCE_T *instance = alsa_stream->instance;
 341 diff --git a/sound/arm/bcm2835.c b/sound/arm/bcm2835.c
 342 index 317e7d9..e2047a7 100755
 343 --- a/sound/arm/bcm2835.c
 344 +++ b/sound/arm/bcm2835.c
 345 @@ -110,20 +110,20 @@ static int snd_bcm2835_alsa_probe(struct platform_device *pdev)
 346
 347         err = snd_bcm2835_create(g_card, pdev, &chip);
 348         if (err < 0) {
 349 -               printk(KERN_ERR "Failed to create bcm2835 chip\n");
 350 +               dev_err(&pdev->dev, "Failed to create bcm2835 chip\n");
 351                 goto out_bcm2835_create;
 352         }
 353
 354         g_chip = chip;
 355         err = snd_bcm2835_new_pcm(chip);
 356         if (err < 0) {
 357 -               printk(KERN_ERR "Failed to create new BCM2835 pcm device\n");
 358 +               dev_err(&pdev->dev, "Failed to create new BCM2835 pcm device\n");
 359                 goto out_bcm2835_new_pcm;
 360         }
 361
 362         err = snd_bcm2835_new_ctl(chip);
 363         if (err < 0) {
 364 -               printk(KERN_ERR "Failed to create new BCM2835 ctl\n");
 365 +               dev_err(&pdev->dev, "Failed to create new BCM2835 ctl\n");
 366                 goto out_bcm2835_new_ctl;
 367         }
 368
 369 @@ -139,14 +139,14 @@ add_register_map:
 370         if (dev == 0) {
 371                 err = snd_card_register(card);
 372                 if (err < 0) {
 373 -                       printk(KERN_ERR
 374 -                              "Failed to register bcm2835 ALSA card \n");
 375 +                       dev_err(&pdev->dev,
 376 +                               "Failed to register bcm2835 ALSA card \n");
 377                         goto out_card_register;
 378                 }
 379                 platform_set_drvdata(pdev, card);
 380 -               printk(KERN_INFO "bcm2835 ALSA card created!\n");
 381 +               audio_info("bcm2835 ALSA card created!\n");
 382         } else {
 383 -               printk(KERN_INFO "bcm2835 ALSA chip created!\n");
 384 +               audio_info("bcm2835 ALSA chip created!\n");
 385                 platform_set_drvdata(pdev, (void *)dev);
 386         }
 387
 388 @@ -160,11 +160,11 @@ out_bcm2835_new_pcm:
 389  out_bcm2835_create:
 390         BUG_ON(!g_card);
 391         if (snd_card_free(g_card))
 392 -               printk(KERN_ERR "Failed to free Registered alsa card\n");
 393 +               dev_err(&pdev->dev, "Failed to free Registered alsa card\n");
 394         g_card = NULL;
 395  out:
 396         dev = SNDRV_CARDS;      /* stop more avail_substreams from being probed */
 397 -       printk(KERN_ERR "BCM2835 ALSA Probe failed !!\n");
 398 +       dev_err(&pdev->dev, "BCM2835 ALSA Probe failed !!\n");
 399         return err;
 400  }
 401
 402 @@ -326,49 +326,49 @@ static int bcm2835_alsa_device_init(void)
 403         int err;
 404         err = platform_driver_register(&bcm2835_alsa0_driver);
 405         if (err) {
 406 -               printk("Error registering bcm2835_alsa0_driver %d .\n", err);
 407 +               pr_err("Error registering bcm2835_alsa0_driver %d .\n", err);
 408                 goto out;
 409         }
 410
 411         err = platform_driver_register(&bcm2835_alsa1_driver);
 412         if (err) {
 413 -               printk("Error registering bcm2835_alsa1_driver %d .\n", err);
 414 +               pr_err("Error registering bcm2835_alsa0_driver %d .\n", err);
 415                 goto unregister_0;
 416         }
 417
 418         err = platform_driver_register(&bcm2835_alsa2_driver);
 419         if (err) {
 420 -               printk("Error registering bcm2835_alsa2_driver %d .\n", err);
 421 +               pr_err("Error registering bcm2835_alsa0_driver %d .\n", err);
 422                 goto unregister_1;
 423         }
 424
 425         err = platform_driver_register(&bcm2835_alsa3_driver);
 426         if (err) {
 427 -               printk("Error registering bcm2835_alsa3_driver %d .\n", err);
 428 +               pr_err("Error registering bcm2835_alsa0_driver %d .\n", err);
 429                 goto unregister_2;
 430         }
 431
 432         err = platform_driver_register(&bcm2835_alsa4_driver);
 433         if (err) {
 434 -               printk("Error registering bcm2835_alsa4_driver %d .\n", err);
 435 +               pr_err("Error registering bcm2835_alsa0_driver %d .\n", err);
 436                 goto unregister_3;
 437         }
 438
 439         err = platform_driver_register(&bcm2835_alsa5_driver);
 440         if (err) {
 441 -               printk("Error registering bcm2835_alsa5_driver %d .\n", err);
 442 +               pr_err("Error registering bcm2835_alsa0_driver %d .\n", err);
 443                 goto unregister_4;
 444         }
 445
 446         err = platform_driver_register(&bcm2835_alsa6_driver);
 447         if (err) {
 448 -               printk("Error registering bcm2835_alsa6_driver %d .\n", err);
 449 +               pr_err("Error registering bcm2835_alsa0_driver %d .\n", err);
 450                 goto unregister_5;
 451         }
 452
 453         err = platform_driver_register(&bcm2835_alsa7_driver);
 454         if (err) {
 455 -               printk("Error registering bcm2835_alsa7_driver %d .\n", err);
 456 +               pr_err("Error registering bcm2835_alsa0_driver %d .\n", err);
 457                 goto unregister_6;
 458         }
 459
 460 diff --git a/sound/arm/bcm2835.h b/sound/arm/bcm2835.h
 461 index 080bd5c..36afee3 100755
 462 --- a/sound/arm/bcm2835.h
 463 +++ b/sound/arm/bcm2835.h
 464 @@ -23,6 +23,7 @@
 465  #include <sound/initval.h>
 466  #include <sound/pcm.h>
 467  #include <sound/pcm_params.h>
 468 +#include <sound/pcm-indirect.h>
 469  #include <linux/workqueue.h>
 470
 471  /*
 472 @@ -110,6 +111,7 @@ typedef struct bcm2835_chip {
 473  typedef struct bcm2835_alsa_stream {
 474         bcm2835_chip_t *chip;
 475         struct snd_pcm_substream *substream;
 476 +       struct snd_pcm_indirect pcm_indirect;
 477
 478         struct semaphore buffers_update_sem;
 479         struct semaphore control_sem;
 480 --
 481 1.9.1
 482