drivers/staging/dream/qdsp5/audio_evrc.c

   1 /* arch/arm/mach-msm/audio_evrc.c
   2  *
   3  * Copyright (c) 2008 QUALCOMM USA, INC.
   4  *
   5  * This code also borrows from audio_aac.c, which is
   6  * Copyright (C) 2008 Google, Inc.
   7  * Copyright (C) 2008 HTC Corporation
   8  *
   9  * This software is licensed under the terms of the GNU General Public
  10  * License version 2, as published by the Free Software Foundation, and
  11  * may be copied, distributed, and modified under those terms.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  16  *
  17  * See the GNU General Public License for more details.
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, you can find it at http://www.fsf.org.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/fs.h>
  24 #include <linux/miscdevice.h>
  25 #include <linux/uaccess.h>
  26 #include <linux/kthread.h>
  27 #include <linux/wait.h>
  28 #include <linux/dma-mapping.h>
  29 #include <linux/delay.h>
  30
  31 #include <asm/atomic.h>
  32 #include <asm/ioctls.h>
  33 #include <mach/msm_adsp.h>
  34 #include <linux/msm_audio.h>
  35 #include "audmgr.h"
  36
  37 #include <mach/qdsp5/qdsp5audppcmdi.h>
  38 #include <mach/qdsp5/qdsp5audppmsg.h>
  39 #include <mach/qdsp5/qdsp5audplaycmdi.h>
  40 #include <mach/qdsp5/qdsp5audplaymsg.h>
  41
  42 #include "adsp.h"
  43
  44 #ifdef DEBUG
  45 #define dprintk(format, arg...) \
  46         printk(KERN_DEBUG format, ## arg)
  47 #else
  48 #define dprintk(format, arg...) do {} while (0)
  49 #endif
  50
  51 /* Hold 30 packets of 24 bytes each*/
  52 #define BUFSZ                   720
  53 #define DMASZ                   (BUFSZ * 2)
  54
  55 #define AUDDEC_DEC_EVRC         12
  56
  57 #define PCM_BUFSZ_MIN           1600    /* 100ms worth of data */
  58 #define PCM_BUF_MAX_COUNT       5
  59 /* DSP only accepts 5 buffers at most
  60  * but support 2 buffers currently
  61  */
  62 #define EVRC_DECODED_FRSZ       320     /* EVRC 20ms 8KHz mono PCM size */
  63
  64 #define ROUTING_MODE_FTRT       1
  65 #define ROUTING_MODE_RT         2
  66 /* Decoder status received from AUDPPTASK */
  67 #define  AUDPP_DEC_STATUS_SLEEP 0
  68 #define  AUDPP_DEC_STATUS_INIT  1
  69 #define  AUDPP_DEC_STATUS_CFG   2
  70 #define  AUDPP_DEC_STATUS_PLAY  3
  71
  72 struct buffer {
  73         void *data;
  74         unsigned size;
  75         unsigned used;          /* Input usage actual DSP produced PCM size  */
  76         unsigned addr;
  77 };
  78
  79 struct audio {
  80         struct buffer out[2];
  81
  82         spinlock_t dsp_lock;
  83
  84         uint8_t out_head;
  85         uint8_t out_tail;
  86         uint8_t out_needed;     /* number of buffers the dsp is waiting for */
  87
  88         atomic_t out_bytes;
  89
  90         struct mutex lock;
  91         struct mutex write_lock;
  92         wait_queue_head_t write_wait;
  93
  94         /* Host PCM section */
  95         struct buffer in[PCM_BUF_MAX_COUNT];
  96         struct mutex read_lock;
  97         wait_queue_head_t read_wait;    /* Wait queue for read */
  98         char *read_data;        /* pointer to reader buffer */
  99         dma_addr_t read_phys;   /* physical address of reader buffer */
 100         uint8_t read_next;      /* index to input buffers to be read next */
 101         uint8_t fill_next;      /* index to buffer that DSP should be filling */
 102         uint8_t pcm_buf_count;  /* number of pcm buffer allocated */
 103         /* ---- End of Host PCM section */
 104
 105         struct msm_adsp_module *audplay;
 106         struct audmgr audmgr;
 107
 108         /* data allocated for various buffers */
 109         char *data;
 110         dma_addr_t phys;
 111
 112         uint8_t opened:1;
 113         uint8_t enabled:1;
 114         uint8_t running:1;
 115         uint8_t stopped:1;      /* set when stopped, cleared on flush */
 116         uint8_t pcm_feedback:1;
 117         uint8_t buf_refresh:1;
 118
 119         unsigned volume;
 120         uint16_t dec_id;
 121         uint32_t read_ptr_offset;
 122 };
 123 static struct audio the_evrc_audio;
 124
 125 static int auddec_dsp_config(struct audio *audio, int enable);
 126 static void audpp_cmd_cfg_adec_params(struct audio *audio);
 127 static void audpp_cmd_cfg_routing_mode(struct audio *audio);
 128 static void audevrc_send_data(struct audio *audio, unsigned needed);
 129 static void audevrc_dsp_event(void *private, unsigned id, uint16_t *msg);
 130 static void audevrc_config_hostpcm(struct audio *audio);
 131 static void audevrc_buffer_refresh(struct audio *audio);
 132
 133 /* must be called with audio->lock held */
 134 static int audevrc_enable(struct audio *audio)
 135 {
 136         struct audmgr_config cfg;
 137         int rc;
 138
 139         if (audio->enabled)
 140                 return 0;
 141
 142         audio->out_tail = 0;
 143         audio->out_needed = 0;
 144
 145         cfg.tx_rate = RPC_AUD_DEF_SAMPLE_RATE_NONE;
 146         cfg.rx_rate = RPC_AUD_DEF_SAMPLE_RATE_48000;
 147         cfg.def_method = RPC_AUD_DEF_METHOD_PLAYBACK;
 148         cfg.codec = RPC_AUD_DEF_CODEC_EVRC;
 149         cfg.snd_method = RPC_SND_METHOD_MIDI;
 150
 151         rc = audmgr_enable(&audio->audmgr, &cfg);
 152         if (rc < 0)
 153                 return rc;
 154
 155         if (msm_adsp_enable(audio->audplay)) {
 156                 pr_err("audio: msm_adsp_enable(audplay) failed\n");
 157                 audmgr_disable(&audio->audmgr);
 158                 return -ENODEV;
 159         }
 160
 161         if (audpp_enable(audio->dec_id, audevrc_dsp_event, audio)) {
 162                 pr_err("audio: audpp_enable() failed\n");
 163                 msm_adsp_disable(audio->audplay);
 164                 audmgr_disable(&audio->audmgr);
 165                 return -ENODEV;
 166         }
 167         audio->enabled = 1;
 168         return 0;
 169 }
 170
 171 /* must be called with audio->lock held */
 172 static int audevrc_disable(struct audio *audio)
 173 {
 174         if (audio->enabled) {
 175                 audio->enabled = 0;
 176                 auddec_dsp_config(audio, 0);
 177                 wake_up(&audio->write_wait);
 178                 wake_up(&audio->read_wait);
 179                 msm_adsp_disable(audio->audplay);
 180                 audpp_disable(audio->dec_id, audio);
 181                 audmgr_disable(&audio->audmgr);
 182                 audio->out_needed = 0;
 183         }
 184         return 0;
 185 }
 186
 187 /* ------------------- dsp --------------------- */
 188
 189 static void audevrc_update_pcm_buf_entry(struct audio *audio,
 190                                          uint32_t *payload)
 191 {
 192         uint8_t index;
 193         unsigned long flags;
 194
 195         spin_lock_irqsave(&audio->dsp_lock, flags);
 196         for (index = 0; index < payload[1]; index++) {
 197                 if (audio->in[audio->fill_next].addr
 198                                 == payload[2 + index * 2]) {
 199                         dprintk("audevrc_update_pcm_buf_entry: in[%d] ready\n",
 200                                 audio->fill_next);
 201                         audio->in[audio->fill_next].used =
 202                                 payload[3 + index * 2];
 203                         if ((++audio->fill_next) == audio->pcm_buf_count)
 204                                 audio->fill_next = 0;
 205
 206                 } else {
 207                         pr_err
 208                         ("audevrc_update_pcm_buf_entry: expected=%x ret=%x\n",
 209                                 audio->in[audio->fill_next].addr,
 210                                 payload[1 + index * 2]);
 211                         break;
 212                 }
 213         }
 214         if (audio->in[audio->fill_next].used == 0) {
 215                 audevrc_buffer_refresh(audio);
 216         } else {
 217                 dprintk("audevrc_update_pcm_buf_entry: read cannot keep up\n");
 218                 audio->buf_refresh = 1;
 219         }
 220
 221         spin_unlock_irqrestore(&audio->dsp_lock, flags);
 222         wake_up(&audio->read_wait);
 223 }
 224
 225 static void audplay_dsp_event(void *data, unsigned id, size_t len,
 226                               void (*getevent) (void *ptr, size_t len))
 227 {
 228         struct audio *audio = data;
 229         uint32_t msg[28];
 230         getevent(msg, sizeof(msg));
 231
 232         dprintk("audplay_dsp_event: msg_id=%x\n", id);
 233         switch (id) {
 234         case AUDPLAY_MSG_DEC_NEEDS_DATA:
 235                 audevrc_send_data(audio, 1);
 236                 break;
 237         case AUDPLAY_MSG_BUFFER_UPDATE:
 238                 dprintk("audevrc_update_pcm_buf_entry:======> \n");
 239                 audevrc_update_pcm_buf_entry(audio, msg);
 240                 break;
 241         default:
 242                 pr_err("unexpected message from decoder \n");
 243         }
 244 }
 245
 246 static void audevrc_dsp_event(void *private, unsigned id, uint16_t *msg)
 247 {
 248         struct audio *audio = private;
 249
 250         switch (id) {
 251         case AUDPP_MSG_STATUS_MSG:{
 252                         unsigned status = msg[1];
 253
 254                         switch (status) {
 255                         case AUDPP_DEC_STATUS_SLEEP:
 256                                 dprintk("decoder status: sleep \n");
 257                                 break;
 258
 259                         case AUDPP_DEC_STATUS_INIT:
 260                                 dprintk("decoder status: init \n");
 261                                 audpp_cmd_cfg_routing_mode(audio);
 262                                 break;
 263
 264                         case AUDPP_DEC_STATUS_CFG:
 265                                 dprintk("decoder status: cfg \n");
 266                                 break;
 267                         case AUDPP_DEC_STATUS_PLAY:
 268                                 dprintk("decoder status: play \n");
 269                                 if (audio->pcm_feedback) {
 270                                         audevrc_config_hostpcm(audio);
 271                                         audevrc_buffer_refresh(audio);
 272                                 }
 273                                 break;
 274                         default:
 275                                 pr_err("unknown decoder status \n");
 276                         }
 277                         break;
 278                 }
 279         case AUDPP_MSG_CFG_MSG:
 280                 if (msg[0] == AUDPP_MSG_ENA_ENA) {
 281                         dprintk("audevrc_dsp_event: CFG_MSG ENABLE\n");
 282                         auddec_dsp_config(audio, 1);
 283                         audio->out_needed = 0;
 284                         audio->running = 1;
 285                         audpp_set_volume_and_pan(audio->dec_id, audio->volume,
 286                                                  0);
 287                         audpp_avsync(audio->dec_id, 22050);
 288                 } else if (msg[0] == AUDPP_MSG_ENA_DIS) {
 289                         dprintk("audevrc_dsp_event: CFG_MSG DISABLE\n");
 290                         audpp_avsync(audio->dec_id, 0);
 291                         audio->running = 0;
 292                 } else {
 293                         pr_err("audevrc_dsp_event: CFG_MSG %d?\n", msg[0]);
 294                 }
 295                 break;
 296         case AUDPP_MSG_ROUTING_ACK:
 297                 dprintk("audevrc_dsp_event: ROUTING_ACK\n");
 298                 audpp_cmd_cfg_adec_params(audio);
 299                 break;
 300
 301         default:
 302                 pr_err("audevrc_dsp_event: UNKNOWN (%d)\n", id);
 303         }
 304
 305 }
 306
 307 struct msm_adsp_ops audplay_adsp_ops_evrc = {
 308         .event = audplay_dsp_event,
 309 };
 310
 311 #define audplay_send_queue0(audio, cmd, len) \
 312         msm_adsp_write(audio->audplay, QDSP_uPAudPlay0BitStreamCtrlQueue, \
 313                        cmd, len)
 314
 315 static int auddec_dsp_config(struct audio *audio, int enable)
 316 {
 317         audpp_cmd_cfg_dec_type cmd;
 318
 319         memset(&cmd, 0, sizeof(cmd));
 320         cmd.cmd_id = AUDPP_CMD_CFG_DEC_TYPE;
 321         if (enable)
 322                 cmd.dec0_cfg = AUDPP_CMD_UPDATDE_CFG_DEC |
 323                     AUDPP_CMD_ENA_DEC_V | AUDDEC_DEC_EVRC;
 324         else
 325                 cmd.dec0_cfg = AUDPP_CMD_UPDATDE_CFG_DEC | AUDPP_CMD_DIS_DEC_V;
 326
 327         return audpp_send_queue1(&cmd, sizeof(cmd));
 328 }
 329
 330 static void audpp_cmd_cfg_adec_params(struct audio *audio)
 331 {
 332         struct audpp_cmd_cfg_adec_params_evrc cmd;
 333
 334         memset(&cmd, 0, sizeof(cmd));
 335         cmd.common.cmd_id = AUDPP_CMD_CFG_ADEC_PARAMS;
 336         cmd.common.length = sizeof(cmd);
 337         cmd.common.dec_id = audio->dec_id;
 338         cmd.common.input_sampling_frequency = 8000;
 339         cmd.stereo_cfg = AUDPP_CMD_PCM_INTF_MONO_V;
 340
 341         audpp_send_queue2(&cmd, sizeof(cmd));
 342 }
 343
 344 static void audpp_cmd_cfg_routing_mode(struct audio *audio)
 345 {
 346         struct audpp_cmd_routing_mode cmd;
 347         dprintk("audpp_cmd_cfg_routing_mode()\n");
 348         memset(&cmd, 0, sizeof(cmd));
 349         cmd.cmd_id = AUDPP_CMD_ROUTING_MODE;
 350         cmd.object_number = audio->dec_id;
 351         if (audio->pcm_feedback)
 352                 cmd.routing_mode = ROUTING_MODE_FTRT;
 353         else
 354                 cmd.routing_mode = ROUTING_MODE_RT;
 355
 356         audpp_send_queue1(&cmd, sizeof(cmd));
 357 }
 358
 359 static int audplay_dsp_send_data_avail(struct audio *audio,
 360                                        unsigned idx, unsigned len)
 361 {
 362         audplay_cmd_bitstream_data_avail cmd;
 363
 364         cmd.cmd_id = AUDPLAY_CMD_BITSTREAM_DATA_AVAIL;
 365         cmd.decoder_id = audio->dec_id;
 366         cmd.buf_ptr = audio->out[idx].addr;
 367         cmd.buf_size = len / 2;
 368         cmd.partition_number = 0;
 369         return audplay_send_queue0(audio, &cmd, sizeof(cmd));
 370 }
 371
 372 static void audevrc_buffer_refresh(struct audio *audio)
 373 {
 374         struct audplay_cmd_buffer_refresh refresh_cmd;
 375
 376         refresh_cmd.cmd_id = AUDPLAY_CMD_BUFFER_REFRESH;
 377         refresh_cmd.num_buffers = 1;
 378         refresh_cmd.buf0_address = audio->in[audio->fill_next].addr;
 379         refresh_cmd.buf0_length = audio->in[audio->fill_next].size;
 380
 381         refresh_cmd.buf_read_count = 0;
 382         dprintk("audplay_buffer_fresh: buf0_addr=%x buf0_len=%d\n",
 383                 refresh_cmd.buf0_address, refresh_cmd.buf0_length);
 384         audplay_send_queue0(audio, &refresh_cmd, sizeof(refresh_cmd));
 385 }
 386
 387 static void audevrc_config_hostpcm(struct audio *audio)
 388 {
 389         struct audplay_cmd_hpcm_buf_cfg cfg_cmd;
 390
 391         dprintk("audevrc_config_hostpcm()\n");
 392         cfg_cmd.cmd_id = AUDPLAY_CMD_HPCM_BUF_CFG;
 393         cfg_cmd.max_buffers = 1;
 394         cfg_cmd.byte_swap = 0;
 395         cfg_cmd.hostpcm_config = (0x8000) | (0x4000);
 396         cfg_cmd.feedback_frequency = 1;
 397         cfg_cmd.partition_number = 0;
 398         audplay_send_queue0(audio, &cfg_cmd, sizeof(cfg_cmd));
 399
 400 }
 401
 402 static void audevrc_send_data(struct audio *audio, unsigned needed)
 403 {
 404         struct buffer *frame;
 405         unsigned long flags;
 406
 407         spin_lock_irqsave(&audio->dsp_lock, flags);
 408         if (!audio->running)
 409                 goto done;
 410
 411         if (needed) {
 412                 /* We were called from the callback because the DSP
 413                  * requested more data.  Note that the DSP does want
 414                  * more data, and if a buffer was in-flight, mark it
 415                  * as available (since the DSP must now be done with
 416                  * it).
 417                  */
 418                 audio->out_needed = 1;
 419                 frame = audio->out + audio->out_tail;
 420                 if (frame->used == 0xffffffff) {
 421                         dprintk("frame %d free\n", audio->out_tail);
 422                         frame->used = 0;
 423                         audio->out_tail ^= 1;
 424                         wake_up(&audio->write_wait);
 425                 }
 426         }
 427
 428         if (audio->out_needed) {
 429                 /* If the DSP currently wants data and we have a
 430                  * buffer available, we will send it and reset
 431                  * the needed flag.  We'll mark the buffer as in-flight
 432                  * so that it won't be recycled until the next buffer
 433                  * is requested
 434                  */
 435
 436                 frame = audio->out + audio->out_tail;
 437                 if (frame->used) {
 438                         BUG_ON(frame->used == 0xffffffff);
 439                         dprintk("frame %d busy\n", audio->out_tail);
 440                         audplay_dsp_send_data_avail(audio, audio->out_tail,
 441                                                     frame->used);
 442                         frame->used = 0xffffffff;
 443                         audio->out_needed = 0;
 444                 }
 445         }
 446 done:
 447         spin_unlock_irqrestore(&audio->dsp_lock, flags);
 448 }
 449
 450 /* ------------------- device --------------------- */
 451
 452 static void audevrc_flush(struct audio *audio)
 453 {
 454         audio->out[0].used = 0;
 455         audio->out[1].used = 0;
 456         audio->out_head = 0;
 457         audio->out_tail = 0;
 458         audio->stopped = 0;
 459         atomic_set(&audio->out_bytes, 0);
 460 }
 461
 462 static void audevrc_flush_pcm_buf(struct audio *audio)
 463 {
 464         uint8_t index;
 465
 466         for (index = 0; index < PCM_BUF_MAX_COUNT; index++)
 467                 audio->in[index].used = 0;
 468
 469         audio->read_next = 0;
 470         audio->fill_next = 0;
 471 }
 472
 473 static long audevrc_ioctl(struct file *file, unsigned int cmd,
 474                           unsigned long arg)
 475 {
 476         struct audio *audio = file->private_data;
 477         int rc = 0;
 478
 479         dprintk("audevrc_ioctl() cmd = %d\n", cmd);
 480
 481         if (cmd == AUDIO_GET_STATS) {
 482                 struct msm_audio_stats stats;
 483                 stats.byte_count = audpp_avsync_byte_count(audio->dec_id);
 484                 stats.sample_count = audpp_avsync_sample_count(audio->dec_id);
 485                 if (copy_to_user((void *)arg, &stats, sizeof(stats)))
 486                         return -EFAULT;
 487                 return 0;
 488         }
 489         if (cmd == AUDIO_SET_VOLUME) {
 490                 unsigned long flags;
 491                 spin_lock_irqsave(&audio->dsp_lock, flags);
 492                 audio->volume = arg;
 493                 if (audio->running)
 494                         audpp_set_volume_and_pan(audio->dec_id, arg, 0);
 495                 spin_unlock_irqrestore(&audio->dsp_lock, flags);
 496                 return 0;
 497         }
 498         mutex_lock(&audio->lock);
 499         switch (cmd) {
 500         case AUDIO_START:
 501                 rc = audevrc_enable(audio);
 502                 break;
 503         case AUDIO_STOP:
 504                 rc = audevrc_disable(audio);
 505                 audio->stopped = 1;
 506                 break;
 507         case AUDIO_SET_CONFIG:{
 508                         dprintk("AUDIO_SET_CONFIG not applicable \n");
 509                         break;
 510                 }
 511         case AUDIO_GET_CONFIG:{
 512                         struct msm_audio_config config;
 513                         config.buffer_size = BUFSZ;
 514                         config.buffer_count = 2;
 515                         config.sample_rate = 8000;
 516                         config.channel_count = 1;
 517                         config.unused[0] = 0;
 518                         config.unused[1] = 0;
 519                         config.unused[2] = 0;
 520                         config.unused[3] = 0;
 521                         if (copy_to_user((void *)arg, &config, sizeof(config)))
 522                                 rc = -EFAULT;
 523                         else
 524                                 rc = 0;
 525                         break;
 526                 }
 527         case AUDIO_GET_PCM_CONFIG:{
 528                         struct msm_audio_pcm_config config;
 529                         config.pcm_feedback = 0;
 530                         config.buffer_count = PCM_BUF_MAX_COUNT;
 531                         config.buffer_size = PCM_BUFSZ_MIN;
 532                         if (copy_to_user((void *)arg, &config, sizeof(config)))
 533                                 rc = -EFAULT;
 534                         else
 535                                 rc = 0;
 536                         break;
 537                 }
 538         case AUDIO_SET_PCM_CONFIG:{
 539                         struct msm_audio_pcm_config config;
 540                         if (copy_from_user
 541                             (&config, (void *)arg, sizeof(config))) {
 542                                 rc = -EFAULT;
 543                                 break;
 544                         }
 545                         if ((config.buffer_count > PCM_BUF_MAX_COUNT) ||
 546                             (config.buffer_count == 1))
 547                                 config.buffer_count = PCM_BUF_MAX_COUNT;
 548
 549                         if (config.buffer_size < PCM_BUFSZ_MIN)
 550                                 config.buffer_size = PCM_BUFSZ_MIN;
 551
 552                         /* Check if pcm feedback is required */
 553                         if ((config.pcm_feedback) && (!audio->read_data)) {
 554                                 dprintk("audevrc_ioctl: allocate PCM buf %d\n",
 555                                         config.buffer_count *
 556                                         config.buffer_size);
 557                                 audio->read_data =
 558                                     dma_alloc_coherent(NULL,
 559                                                        config.buffer_size *
 560                                                        config.buffer_count,
 561                                                        &audio->read_phys,
 562                                                        GFP_KERNEL);
 563                                 if (!audio->read_data) {
 564                                         pr_err
 565                                         ("audevrc_ioctl: no mem for pcm buf\n");
 566                                         rc = -1;
 567                                 } else {
 568                                         uint8_t index;
 569                                         uint32_t offset = 0;
 570                                         audio->pcm_feedback = 1;
 571                                         audio->buf_refresh = 0;
 572                                         audio->pcm_buf_count =
 573                                             config.buffer_count;
 574                                         audio->read_next = 0;
 575                                         audio->fill_next = 0;
 576
 577                                         for (index = 0;
 578                                              index < config.buffer_count;
 579                                              index++) {
 580                                                 audio->in[index].data =
 581                                                     audio->read_data + offset;
 582                                                 audio->in[index].addr =
 583                                                     audio->read_phys + offset;
 584                                                 audio->in[index].size =
 585                                                     config.buffer_size;
 586                                                 audio->in[index].used = 0;
 587                                                 offset += config.buffer_size;
 588                                         }
 589                                         rc = 0;
 590                                 }
 591                         } else {
 592                                 rc = 0;
 593                         }
 594                         break;
 595                 }
 596         case AUDIO_PAUSE:
 597                 dprintk("%s: AUDIO_PAUSE %ld\n", __func__, arg);
 598                 rc = audpp_pause(audio->dec_id, (int) arg);
 599                 break;
 600         default:
 601                 rc = -EINVAL;
 602         }
 603         mutex_unlock(&audio->lock);
 604         return rc;
 605 }
 606
 607 static ssize_t audevrc_read(struct file *file, char __user *buf, size_t count,
 608                             loff_t *pos)
 609 {
 610         struct audio *audio = file->private_data;
 611         const char __user *start = buf;
 612         int rc = 0;
 613         if (!audio->pcm_feedback) {
 614                 return 0;
 615                 /* PCM feedback is not enabled. Nothing to read */
 616         }
 617         mutex_lock(&audio->read_lock);
 618         dprintk("audevrc_read() \n");
 619         while (count > 0) {
 620                 rc = wait_event_interruptible(audio->read_wait,
 621                                               (audio->in[audio->read_next].
 622                                                used > 0) || (audio->stopped));
 623                 dprintk("audevrc_read() wait terminated \n");
 624                 if (rc < 0)
 625                         break;
 626                 if (audio->stopped) {
 627                         rc = -EBUSY;
 628                         break;
 629                 }
 630                 if (count < audio->in[audio->read_next].used) {
 631                         /* Read must happen in frame boundary. Since driver does
 632                          * not know frame size, read count must be greater or
 633                          * equal to size of PCM samples
 634                          */
 635                         dprintk("audevrc_read:read stop - partial frame\n");
 636                         break;
 637                 } else {
 638                         dprintk("audevrc_read: read from in[%d]\n",
 639                                 audio->read_next);
 640                         if (copy_to_user
 641                             (buf, audio->in[audio->read_next].data,
 642                              audio->in[audio->read_next].used)) {
 643                                 pr_err("audevrc_read: invalid addr %x \n",
 644                                        (unsigned int)buf);
 645                                 rc = -EFAULT;
 646                                 break;
 647                         }
 648                         count -= audio->in[audio->read_next].used;
 649                         buf += audio->in[audio->read_next].used;
 650                         audio->in[audio->read_next].used = 0;
 651                         if ((++audio->read_next) == audio->pcm_buf_count)
 652                                 audio->read_next = 0;
 653                         if (audio->in[audio->read_next].used == 0)
 654                                 break;  /* No data ready at this moment
 655                                          * Exit while loop to prevent
 656                                          * output thread sleep too long
 657                                          */
 658
 659                 }
 660         }
 661         if (audio->buf_refresh) {
 662                 audio->buf_refresh = 0;
 663                 dprintk("audevrc_read: kick start pcm feedback again\n");
 664                 audevrc_buffer_refresh(audio);
 665         }
 666         mutex_unlock(&audio->read_lock);
 667         if (buf > start)
 668                 rc = buf - start;
 669         dprintk("audevrc_read: read %d bytes\n", rc);
 670         return rc;
 671 }
 672
 673 static ssize_t audevrc_write(struct file *file, const char __user *buf,
 674                              size_t count, loff_t *pos)
 675 {
 676         struct audio *audio = file->private_data;
 677         const char __user *start = buf;
 678         struct buffer *frame;
 679         size_t xfer;
 680         int rc = 0;
 681
 682         if (count & 1)
 683                 return -EINVAL;
 684         mutex_lock(&audio->write_lock);
 685         dprintk("audevrc_write() \n");
 686         while (count > 0) {
 687                 frame = audio->out + audio->out_head;
 688                 rc = wait_event_interruptible(audio->write_wait,
 689                                               (frame->used == 0)
 690                                               || (audio->stopped));
 691                 if (rc < 0)
 692                         break;
 693                 if (audio->stopped) {
 694                         rc = -EBUSY;
 695                         break;
 696                 }
 697                 xfer = (count > frame->size) ? frame->size : count;
 698                 if (copy_from_user(frame->data, buf, xfer)) {
 699                         rc = -EFAULT;
 700                         break;
 701                 }
 702
 703                 frame->used = xfer;
 704                 audio->out_head ^= 1;
 705                 count -= xfer;
 706                 buf += xfer;
 707
 708                 audevrc_send_data(audio, 0);
 709
 710         }
 711         mutex_unlock(&audio->write_lock);
 712         if (buf > start)
 713                 return buf - start;
 714         return rc;
 715 }
 716
 717 static int audevrc_release(struct inode *inode, struct file *file)
 718 {
 719         struct audio *audio = file->private_data;
 720
 721         dprintk("audevrc_release()\n");
 722
 723         mutex_lock(&audio->lock);
 724         audevrc_disable(audio);
 725         audevrc_flush(audio);
 726         audevrc_flush_pcm_buf(audio);
 727         msm_adsp_put(audio->audplay);
 728         audio->audplay = NULL;
 729         audio->opened = 0;
 730         dma_free_coherent(NULL, DMASZ, audio->data, audio->phys);
 731         audio->data = NULL;
 732         if (audio->read_data != NULL) {
 733                 dma_free_coherent(NULL,
 734                                   audio->in[0].size * audio->pcm_buf_count,
 735                                   audio->read_data, audio->read_phys);
 736                 audio->read_data = NULL;
 737         }
 738         audio->pcm_feedback = 0;
 739         mutex_unlock(&audio->lock);
 740         return 0;
 741 }
 742
 743 static struct audio the_evrc_audio;
 744
 745 static int audevrc_open(struct inode *inode, struct file *file)
 746 {
 747         struct audio *audio = &the_evrc_audio;
 748         int rc;
 749
 750         if (audio->opened) {
 751                 pr_err("audio: busy\n");
 752                 return -EBUSY;
 753         }
 754
 755         /* Acquire Lock */
 756         mutex_lock(&audio->lock);
 757
 758         if (!audio->data) {
 759                 audio->data = dma_alloc_coherent(NULL, DMASZ,
 760                                                  &audio->phys, GFP_KERNEL);
 761                 if (!audio->data) {
 762                         pr_err("audio: could not allocate DMA buffers\n");
 763                         rc = -ENOMEM;
 764                         goto dma_fail;
 765                 }
 766         }
 767
 768         rc = audmgr_open(&audio->audmgr);
 769         if (rc)
 770                 goto audmgr_fail;
 771
 772         rc = msm_adsp_get("AUDPLAY0TASK", &audio->audplay,
 773                           &audplay_adsp_ops_evrc, audio);
 774         if (rc) {
 775                 pr_err("audio: failed to get audplay0 dsp module\n");
 776                 goto adsp_fail;
 777         }
 778
 779         audio->dec_id = 0;
 780
 781         audio->out[0].data = audio->data + 0;
 782         audio->out[0].addr = audio->phys + 0;
 783         audio->out[0].size = BUFSZ;
 784
 785         audio->out[1].data = audio->data + BUFSZ;
 786         audio->out[1].addr = audio->phys + BUFSZ;
 787         audio->out[1].size = BUFSZ;
 788
 789         audio->volume = 0x3FFF;
 790
 791         audevrc_flush(audio);
 792
 793         audio->opened = 1;
 794         file->private_data = audio;
 795
 796         mutex_unlock(&audio->lock);
 797         return rc;
 798
 799 adsp_fail:
 800         audmgr_close(&audio->audmgr);
 801 audmgr_fail:
 802         dma_free_coherent(NULL, DMASZ, audio->data, audio->phys);
 803 dma_fail:
 804         mutex_unlock(&audio->lock);
 805         return rc;
 806 }
 807
 808 static struct file_operations audio_evrc_fops = {
 809         .owner = THIS_MODULE,
 810         .open = audevrc_open,
 811         .release = audevrc_release,
 812         .read = audevrc_read,
 813         .write = audevrc_write,
 814         .unlocked_ioctl = audevrc_ioctl,
 815 };
 816
 817 struct miscdevice audio_evrc_misc = {
 818         .minor = MISC_DYNAMIC_MINOR,
 819         .name = "msm_evrc",
 820         .fops = &audio_evrc_fops,
 821 };
 822
 823 static int __init audevrc_init(void)
 824 {
 825         mutex_init(&the_evrc_audio.lock);
 826         mutex_init(&the_evrc_audio.write_lock);
 827         mutex_init(&the_evrc_audio.read_lock);
 828         spin_lock_init(&the_evrc_audio.dsp_lock);
 829         init_waitqueue_head(&the_evrc_audio.write_wait);
 830         init_waitqueue_head(&the_evrc_audio.read_wait);
 831         the_evrc_audio.read_data = NULL;
 832         return misc_register(&audio_evrc_misc);
 833 }
 834
 835 static void __exit audevrc_exit(void)
 836 {
 837         misc_deregister(&audio_evrc_misc);
 838 }
 839
 840 module_init(audevrc_init);
 841 module_exit(audevrc_exit);
 842
 843 MODULE_DESCRIPTION("MSM EVRC driver");
 844 MODULE_LICENSE("GPL v2");
 845 MODULE_AUTHOR("QUALCOMM Inc");