drivers/staging/dream/qdsp5/audio_qcelp.c

   1 /* arch/arm/mach-msm/qdsp5/audio_qcelp.c
   2  *
   3  * qcelp 13k audio decoder device
   4  *
   5  * Copyright (c) 2008 QUALCOMM USA, INC.
   6  *
   7  * This code is based in part on audio_mp3.c, which is
   8  * Copyright (C) 2008 Google, Inc.
   9  * Copyright (C) 2008 HTC Corporation
  10  *
  11  * This software is licensed under the terms of the GNU General Public
  12  * License version 2, as published by the Free Software Foundation, and
  13  * may be copied, distributed, and modified under those terms.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  18  *
  19  * See the GNU General Public License for more details.
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, you can find it at http://www.fsf.org.
  22  *
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/fs.h>
  27 #include <linux/miscdevice.h>
  28 #include <linux/uaccess.h>
  29 #include <linux/sched.h>
  30 #include <linux/wait.h>
  31 #include <linux/dma-mapping.h>
  32
  33 #include <asm/ioctls.h>
  34 #include <mach/msm_adsp.h>
  35 #include <linux/msm_audio.h>
  36 #include <mach/qdsp5/qdsp5audppcmdi.h>
  37 #include <mach/qdsp5/qdsp5audppmsg.h>
  38 #include <mach/qdsp5/qdsp5audplaycmdi.h>
  39 #include <mach/qdsp5/qdsp5audplaymsg.h>
  40
  41 #include "audmgr.h"
  42 /* for queue ids - should be relative to module number*/
  43 #include "adsp.h"
  44
  45 #ifdef DEBUG
  46 #define dprintk(format, arg...) \
  47 printk(KERN_DEBUG format, ## arg)
  48 #else
  49 #define dprintk(format, arg...) do {} while (0)
  50 #endif
  51
  52 #define BUFSZ 1080 /* QCELP 13K Hold 600ms packet data = 36 * 30 */
  53 #define BUF_COUNT 2
  54 #define DMASZ (BUFSZ * BUF_COUNT)
  55
  56 #define PCM_BUFSZ_MIN 1600 /* 100ms worth of data */
  57 #define PCM_BUF_MAX_COUNT 5
  58
  59 #define AUDDEC_DEC_QCELP 9
  60
  61 #define ROUTING_MODE_FTRT       1
  62 #define ROUTING_MODE_RT         2
  63 /* Decoder status received from AUDPPTASK */
  64 #define AUDPP_DEC_STATUS_SLEEP  0
  65 #define AUDPP_DEC_STATUS_INIT   1
  66 #define AUDPP_DEC_STATUS_CFG    2
  67 #define AUDPP_DEC_STATUS_PLAY   3
  68
  69 struct buffer {
  70         void *data;
  71         unsigned size;
  72         unsigned used;          /* Input usage actual DSP produced PCM size  */
  73         unsigned addr;
  74 };
  75
  76 struct audio {
  77         struct buffer out[BUF_COUNT];
  78
  79         spinlock_t dsp_lock;
  80
  81         uint8_t out_head;
  82         uint8_t out_tail;
  83         uint8_t out_needed;     /* number of buffers the dsp is waiting for */
  84
  85         struct mutex lock;
  86         struct mutex write_lock;
  87         wait_queue_head_t write_wait;
  88
  89         /* Host PCM section - START */
  90         struct buffer in[PCM_BUF_MAX_COUNT];
  91         struct mutex read_lock;
  92         wait_queue_head_t read_wait;    /* Wait queue for read */
  93         char *read_data;        /* pointer to reader buffer */
  94         dma_addr_t read_phys;   /* physical address of reader buffer */
  95         uint8_t read_next;      /* index to input buffers to be read next */
  96         uint8_t fill_next;      /* index to buffer that DSP should be filling */
  97         uint8_t pcm_buf_count;  /* number of pcm buffer allocated */
  98         /* Host PCM section - END */
  99
 100         struct msm_adsp_module *audplay;
 101
 102         struct audmgr audmgr;
 103
 104         /* data allocated for various buffers */
 105         char *data;
 106         dma_addr_t phys;
 107
 108         uint8_t opened:1;
 109         uint8_t enabled:1;
 110         uint8_t running:1;
 111         uint8_t stopped:1;      /* set when stopped, cleared on flush */
 112         uint8_t pcm_feedback:1; /* set when non-tunnel mode */
 113         uint8_t buf_refresh:1;
 114
 115         unsigned volume;
 116
 117         uint16_t dec_id;
 118 };
 119
 120 static struct audio the_qcelp_audio;
 121
 122 static int auddec_dsp_config(struct audio *audio, int enable);
 123 static void audpp_cmd_cfg_adec_params(struct audio *audio);
 124 static void audpp_cmd_cfg_routing_mode(struct audio *audio);
 125 static void audqcelp_send_data(struct audio *audio, unsigned needed);
 126 static void audqcelp_config_hostpcm(struct audio *audio);
 127 static void audqcelp_buffer_refresh(struct audio *audio);
 128 static void audqcelp_dsp_event(void *private, unsigned id, uint16_t *msg);
 129
 130 /* must be called with audio->lock held */
 131 static int audqcelp_enable(struct audio *audio)
 132 {
 133         struct audmgr_config cfg;
 134         int rc;
 135
 136         dprintk("audqcelp_enable()\n");
 137
 138         if (audio->enabled)
 139                 return 0;
 140
 141         audio->out_tail = 0;
 142         audio->out_needed = 0;
 143
 144         cfg.tx_rate = RPC_AUD_DEF_SAMPLE_RATE_NONE;
 145         cfg.rx_rate = RPC_AUD_DEF_SAMPLE_RATE_48000;
 146         cfg.def_method = RPC_AUD_DEF_METHOD_PLAYBACK;
 147         cfg.codec = RPC_AUD_DEF_CODEC_13K;
 148         cfg.snd_method = RPC_SND_METHOD_MIDI;
 149
 150         rc = audmgr_enable(&audio->audmgr, &cfg);
 151         if (rc < 0)
 152                 return rc;
 153
 154         if (msm_adsp_enable(audio->audplay)) {
 155                 pr_err("audio: msm_adsp_enable(audplay) failed\n");
 156                 audmgr_disable(&audio->audmgr);
 157                 return -ENODEV;
 158         }
 159
 160         if (audpp_enable(audio->dec_id, audqcelp_dsp_event, audio)) {
 161                 pr_err("audio: audpp_enable() failed\n");
 162                 msm_adsp_disable(audio->audplay);
 163                 audmgr_disable(&audio->audmgr);
 164                 return -ENODEV;
 165         }
 166         audio->enabled = 1;
 167         return 0;
 168 }
 169
 170 /* must be called with audio->lock held */
 171 static int audqcelp_disable(struct audio *audio)
 172 {
 173         dprintk("audqcelp_disable()\n");
 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 static void audqcelp_update_pcm_buf_entry(struct audio *audio,
 189         uint32_t *payload)
 190 {
 191         uint8_t index;
 192         unsigned long flags;
 193
 194         spin_lock_irqsave(&audio->dsp_lock, flags);
 195         for (index = 0; index < payload[1]; index++) {
 196                 if (audio->in[audio->fill_next].addr ==
 197                         payload[2 + index * 2]) {
 198                         dprintk("audqcelp_update_pcm_buf_entry: in[%d] ready\n",
 199                         audio->fill_next);
 200                         audio->in[audio->fill_next].used =
 201                         payload[3 + index * 2];
 202                         if ((++audio->fill_next) == audio->pcm_buf_count)
 203                                 audio->fill_next = 0;
 204                 } else {
 205                         pr_err(
 206                         "audqcelp_update_pcm_buf_entry: expected=%x ret=%x\n",
 207                         audio->in[audio->fill_next].addr,
 208                         payload[1 + index * 2]);
 209                         break;
 210                 }
 211         }
 212         if (audio->in[audio->fill_next].used == 0) {
 213                 audqcelp_buffer_refresh(audio);
 214         } else {
 215                 dprintk("audqcelp_update_pcm_buf_entry: read cannot keep up\n");
 216                 audio->buf_refresh = 1;
 217         }
 218
 219         spin_unlock_irqrestore(&audio->dsp_lock, flags);
 220         wake_up(&audio->read_wait);
 221 }
 222
 223 static void audplay_dsp_event(void *data, unsigned id, size_t len,
 224                               void (*getevent) (void *ptr, size_t len))
 225 {
 226         struct audio *audio = data;
 227         uint32_t msg[28];
 228         getevent(msg, sizeof(msg));
 229
 230         dprintk("audplay_dsp_event: msg_id=%x\n", id);
 231
 232         switch (id) {
 233         case AUDPLAY_MSG_DEC_NEEDS_DATA:
 234                 audqcelp_send_data(audio, 1);
 235                 break;
 236
 237         case AUDPLAY_MSG_BUFFER_UPDATE:
 238                 audqcelp_update_pcm_buf_entry(audio, msg);
 239                 break;
 240
 241         default:
 242                 pr_err("unexpected message from decoder \n");
 243         }
 244 }
 245
 246 static void audqcelp_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                                         audqcelp_config_hostpcm(audio);
 271                                         audqcelp_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("audqcelp_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("audqcelp_dsp_event: CFG_MSG DISABLE\n");
 290                         audpp_avsync(audio->dec_id, 0);
 291                         audio->running = 0;
 292                 } else {
 293                         pr_err("audqcelp_dsp_event: CFG_MSG %d?\n", msg[0]);
 294                 }
 295                 break;
 296         case AUDPP_MSG_ROUTING_ACK:
 297                 dprintk("audqcelp_dsp_event: ROUTING_ACK mode=%d\n", msg[1]);
 298                 audpp_cmd_cfg_adec_params(audio);
 299                 break;
 300         default:
 301                 pr_err("audqcelp_dsp_event: UNKNOWN (%d)\n", id);
 302         }
 303
 304 }
 305
 306 struct msm_adsp_ops audplay_adsp_ops_qcelp = {
 307         .event = audplay_dsp_event,
 308 };
 309
 310 #define audplay_send_queue0(audio, cmd, len) \
 311         msm_adsp_write(audio->audplay, QDSP_uPAudPlay0BitStreamCtrlQueue, \
 312                        cmd, len)
 313
 314 static int auddec_dsp_config(struct audio *audio, int enable)
 315 {
 316         audpp_cmd_cfg_dec_type cmd;
 317
 318         memset(&cmd, 0, sizeof(cmd));
 319         cmd.cmd_id = AUDPP_CMD_CFG_DEC_TYPE;
 320         if (enable)
 321                 cmd.dec0_cfg = AUDPP_CMD_UPDATDE_CFG_DEC |
 322                     AUDPP_CMD_ENA_DEC_V | AUDDEC_DEC_QCELP;
 323         else
 324                 cmd.dec0_cfg = AUDPP_CMD_UPDATDE_CFG_DEC | AUDPP_CMD_DIS_DEC_V;
 325
 326         return audpp_send_queue1(&cmd, sizeof(cmd));
 327 }
 328
 329 static void audpp_cmd_cfg_adec_params(struct audio *audio)
 330 {
 331         struct audpp_cmd_cfg_adec_params_v13k cmd;
 332
 333         memset(&cmd, 0, sizeof(cmd));
 334         cmd.common.cmd_id = AUDPP_CMD_CFG_ADEC_PARAMS;
 335         cmd.common.length = AUDPP_CMD_CFG_ADEC_PARAMS_V13K_LEN;
 336         cmd.common.dec_id = audio->dec_id;
 337         cmd.common.input_sampling_frequency = 8000;
 338         cmd.stereo_cfg = AUDPP_CMD_PCM_INTF_MONO_V;
 339
 340         audpp_send_queue2(&cmd, sizeof(cmd));
 341 }
 342
 343 static void audpp_cmd_cfg_routing_mode(struct audio *audio)
 344 {
 345         struct audpp_cmd_routing_mode cmd;
 346         dprintk("audpp_cmd_cfg_routing_mode()\n");
 347         memset(&cmd, 0, sizeof(cmd));
 348         cmd.cmd_id = AUDPP_CMD_ROUTING_MODE;
 349         cmd.object_number = audio->dec_id;
 350         if (audio->pcm_feedback)
 351                 cmd.routing_mode = ROUTING_MODE_FTRT;
 352         else
 353                 cmd.routing_mode = ROUTING_MODE_RT;
 354         audpp_send_queue1(&cmd, sizeof(cmd));
 355 }
 356
 357 static int audplay_dsp_send_data_avail(struct audio *audio,
 358                                        unsigned idx, unsigned len)
 359 {
 360         audplay_cmd_bitstream_data_avail cmd;
 361
 362         cmd.cmd_id = AUDPLAY_CMD_BITSTREAM_DATA_AVAIL;
 363         cmd.decoder_id = audio->dec_id;
 364         cmd.buf_ptr = audio->out[idx].addr;
 365         cmd.buf_size = len / 2;
 366         cmd.partition_number = 0;
 367         return audplay_send_queue0(audio, &cmd, sizeof(cmd));
 368 }
 369
 370 static void audqcelp_buffer_refresh(struct audio *audio)
 371 {
 372         struct audplay_cmd_buffer_refresh refresh_cmd;
 373
 374         refresh_cmd.cmd_id = AUDPLAY_CMD_BUFFER_REFRESH;
 375         refresh_cmd.num_buffers = 1;
 376         refresh_cmd.buf0_address = audio->in[audio->fill_next].addr;
 377         refresh_cmd.buf0_length = audio->in[audio->fill_next].size;
 378         refresh_cmd.buf_read_count = 0;
 379         dprintk("audplay_buffer_fresh: buf0_addr=%x buf0_len=%d\n",
 380                 refresh_cmd.buf0_address, refresh_cmd.buf0_length);
 381
 382         (void)audplay_send_queue0(audio, &refresh_cmd, sizeof(refresh_cmd));
 383 }
 384
 385 static void audqcelp_config_hostpcm(struct audio *audio)
 386 {
 387         struct audplay_cmd_hpcm_buf_cfg cfg_cmd;
 388
 389         dprintk("audqcelp_config_hostpcm()\n");
 390         cfg_cmd.cmd_id = AUDPLAY_CMD_HPCM_BUF_CFG;
 391         cfg_cmd.max_buffers = audio->pcm_buf_count;
 392         cfg_cmd.byte_swap = 0;
 393         cfg_cmd.hostpcm_config = (0x8000) | (0x4000);
 394         cfg_cmd.feedback_frequency = 1;
 395         cfg_cmd.partition_number = 0;
 396
 397         (void)audplay_send_queue0(audio, &cfg_cmd, sizeof(cfg_cmd));
 398 }
 399
 400 static void audqcelp_send_data(struct audio *audio, unsigned needed)
 401 {
 402         struct buffer *frame;
 403         unsigned long flags;
 404
 405         spin_lock_irqsave(&audio->dsp_lock, flags);
 406         if (!audio->running)
 407                 goto done;
 408
 409         if (needed) {
 410                 /* We were called from the callback because the DSP
 411                  * requested more data.  Note that the DSP does want
 412                  * more data, and if a buffer was in-flight, mark it
 413                  * as available (since the DSP must now be done with
 414                  * it).
 415                  */
 416                 audio->out_needed = 1;
 417                 frame = audio->out + audio->out_tail;
 418                 if (frame->used == 0xffffffff) {
 419                         dprintk("frame %d free\n", audio->out_tail);
 420                         frame->used = 0;
 421                         audio->out_tail ^= 1;
 422                         wake_up(&audio->write_wait);
 423                 }
 424         }
 425
 426         if (audio->out_needed) {
 427                 /* If the DSP currently wants data and we have a
 428                  * buffer available, we will send it and reset
 429                  * the needed flag.  We'll mark the buffer as in-flight
 430                  * so that it won't be recycled until the next buffer
 431                  * is requested
 432                  */
 433
 434                 frame = audio->out + audio->out_tail;
 435                 if (frame->used) {
 436                         BUG_ON(frame->used == 0xffffffff);
 437                         dprintk("frame %d busy\n", audio->out_tail);
 438                         audplay_dsp_send_data_avail(audio, audio->out_tail,
 439                                                     frame->used);
 440                         frame->used = 0xffffffff;
 441                         audio->out_needed = 0;
 442                 }
 443         }
 444  done:
 445         spin_unlock_irqrestore(&audio->dsp_lock, flags);
 446 }
 447
 448 /* ------------------- device --------------------- */
 449
 450 static void audqcelp_flush(struct audio *audio)
 451 {
 452         audio->out[0].used = 0;
 453         audio->out[1].used = 0;
 454         audio->out_head = 0;
 455         audio->out_tail = 0;
 456         audio->stopped = 0;
 457 }
 458
 459 static void audqcelp_flush_pcm_buf(struct audio *audio)
 460 {
 461         uint8_t index;
 462
 463         for (index = 0; index < PCM_BUF_MAX_COUNT; index++)
 464                 audio->in[index].used = 0;
 465
 466         audio->read_next = 0;
 467         audio->fill_next = 0;
 468 }
 469
 470 static long audqcelp_ioctl(struct file *file, unsigned int cmd,
 471                 unsigned long arg)
 472 {
 473         struct audio *audio = file->private_data;
 474         int rc = 0;
 475
 476         dprintk("audqcelp_ioctl() cmd = %d\n", cmd);
 477
 478         if (cmd == AUDIO_GET_STATS) {
 479                 struct msm_audio_stats stats;
 480                 stats.byte_count = audpp_avsync_byte_count(audio->dec_id);
 481                 stats.sample_count = audpp_avsync_sample_count(audio->dec_id);
 482                 if (copy_to_user((void *)arg, &stats, sizeof(stats)))
 483                         return -EFAULT;
 484                 return 0;
 485         }
 486         if (cmd == AUDIO_SET_VOLUME) {
 487                 unsigned long flags;
 488                 spin_lock_irqsave(&audio->dsp_lock, flags);
 489                 audio->volume = arg;
 490                 if (audio->running)
 491                         audpp_set_volume_and_pan(audio->dec_id, arg, 0);
 492                 spin_unlock_irqrestore(&audio->dsp_lock, flags);
 493                 return 0;
 494         }
 495         mutex_lock(&audio->lock);
 496         switch (cmd) {
 497         case AUDIO_START:
 498                 rc = audqcelp_enable(audio);
 499                 break;
 500         case AUDIO_STOP:
 501                 rc = audqcelp_disable(audio);
 502                 audio->stopped = 1;
 503                 break;
 504         case AUDIO_FLUSH:
 505                 if (audio->stopped) {
 506                         /* Make sure we're stopped and we wake any threads
 507                          * that might be blocked holding the write_lock.
 508                          * While audio->stopped write threads will always
 509                          * exit immediately.
 510                          */
 511                         wake_up(&audio->write_wait);
 512                         mutex_lock(&audio->write_lock);
 513                         audqcelp_flush(audio);
 514                         mutex_unlock(&audio->write_lock);
 515                         wake_up(&audio->read_wait);
 516                         mutex_lock(&audio->read_lock);
 517                         audqcelp_flush_pcm_buf(audio);
 518                         mutex_unlock(&audio->read_lock);
 519                         break;
 520                 }
 521                 break;
 522         case AUDIO_SET_CONFIG:
 523                 dprintk("AUDIO_SET_CONFIG not applicable \n");
 524                 break;
 525         case AUDIO_GET_CONFIG:{
 526                         struct msm_audio_config config;
 527                         config.buffer_size = BUFSZ;
 528                         config.buffer_count = BUF_COUNT;
 529                         config.sample_rate = 8000;
 530                         config.channel_count = 1;
 531                         config.unused[0] = 0;
 532                         config.unused[1] = 0;
 533                         config.unused[2] = 0;
 534                         config.unused[3] = 0;
 535                         if (copy_to_user((void *)arg, &config,
 536                                          sizeof(config)))
 537                                 rc = -EFAULT;
 538                         else
 539                                 rc = 0;
 540
 541                         break;
 542                 }
 543         case AUDIO_GET_PCM_CONFIG:{
 544                         struct msm_audio_pcm_config config;
 545
 546                         config.pcm_feedback = 0;
 547                         config.buffer_count = PCM_BUF_MAX_COUNT;
 548                         config.buffer_size = PCM_BUFSZ_MIN;
 549                         if (copy_to_user((void *)arg, &config,
 550                                 sizeof(config)))
 551                                 rc = -EFAULT;
 552                         else
 553                                 rc = 0;
 554                         break;
 555                 }
 556         case AUDIO_SET_PCM_CONFIG:{
 557                         struct msm_audio_pcm_config config;
 558
 559                         if (copy_from_user(&config, (void *)arg,
 560                                 sizeof(config))) {
 561                                 rc = -EFAULT;
 562                                 break;
 563                         }
 564                         if ((config.buffer_count > PCM_BUF_MAX_COUNT) ||
 565                                 (config.buffer_count == 1))
 566                                 config.buffer_count = PCM_BUF_MAX_COUNT;
 567
 568                         if (config.buffer_size < PCM_BUFSZ_MIN)
 569                                 config.buffer_size = PCM_BUFSZ_MIN;
 570
 571                         /* Check if pcm feedback is required */
 572                         if ((config.pcm_feedback) && (!audio->read_data)) {
 573                                 dprintk(
 574                                 "audqcelp_ioctl: allocate PCM buf %d\n",
 575                                 config.buffer_count * config.buffer_size);
 576                                 audio->read_data = dma_alloc_coherent(NULL,
 577                                 config.buffer_size * config.buffer_count,
 578                                 &audio->read_phys, GFP_KERNEL);
 579                                 if (!audio->read_data) {
 580                                         pr_err(
 581                                         "audqcelp_ioctl: no mem for pcm buf\n"
 582                                         );
 583                                         rc = -ENOMEM;
 584                                 } else {
 585                                         uint8_t index;
 586                                         uint32_t offset = 0;
 587
 588                                         audio->pcm_feedback = 1;
 589                                         audio->buf_refresh = 0;
 590                                         audio->pcm_buf_count =
 591                                                 config.buffer_count;
 592                                         audio->read_next = 0;
 593                                         audio->fill_next = 0;
 594
 595                                         for (index = 0;
 596                                         index < config.buffer_count; index++) {
 597                                                 audio->in[index].data =
 598                                                 audio->read_data + offset;
 599                                                 audio->in[index].addr =
 600                                                 audio->read_phys + offset;
 601                                                 audio->in[index].size =
 602                                                 config.buffer_size;
 603                                                 audio->in[index].used = 0;
 604                                                 offset += config.buffer_size;
 605                                         }
 606                                         rc = 0;
 607                                 }
 608                         } else {
 609                                 rc = 0;
 610                         }
 611                         break;
 612                 }
 613         case AUDIO_PAUSE:
 614                 dprintk("%s: AUDIO_PAUSE %ld\n", __func__, arg);
 615                 rc = audpp_pause(audio->dec_id, (int) arg);
 616                 break;
 617         default:
 618                 rc = -EINVAL;
 619         }
 620         mutex_unlock(&audio->lock);
 621         return rc;
 622 }
 623
 624 static ssize_t audqcelp_read(struct file *file, char __user *buf, size_t count,
 625                         loff_t *pos)
 626 {
 627         struct audio *audio = file->private_data;
 628         const char __user *start = buf;
 629         int rc = 0;
 630
 631         if (!audio->pcm_feedback)
 632                 return 0; /* PCM feedback is not enabled. Nothing to read */
 633
 634         mutex_lock(&audio->read_lock);
 635         dprintk("audqcelp_read() %d \n", count);
 636         while (count > 0) {
 637                 rc = wait_event_interruptible(audio->read_wait,
 638                                 (audio->in[audio->read_next].used > 0) ||
 639                                 (audio->stopped));
 640                 if (rc < 0)
 641                         break;
 642
 643                 if (audio->stopped) {
 644                         rc = -EBUSY;
 645                         break;
 646                 }
 647
 648                 if (count < audio->in[audio->read_next].used) {
 649                         /* Read must happen in frame boundary. Since driver does
 650                         not know frame size, read count must be greater or equal
 651                         to size of PCM samples */
 652                         dprintk("audqcelp_read:read stop - partial frame\n");
 653                         break;
 654                 } else {
 655                         dprintk("audqcelp_read: read from in[%d]\n",
 656                                 audio->read_next);
 657                         if (copy_to_user(buf,
 658                                 audio->in[audio->read_next].data,
 659                                 audio->in[audio->read_next].used)) {
 660                                 pr_err("audqcelp_read: invalid addr %x \n",
 661                                         (unsigned int)buf);
 662                                 rc = -EFAULT;
 663                                 break;
 664                         }
 665                         count -= audio->in[audio->read_next].used;
 666                         buf += audio->in[audio->read_next].used;
 667                         audio->in[audio->read_next].used = 0;
 668                         if ((++audio->read_next) == audio->pcm_buf_count)
 669                                 audio->read_next = 0;
 670                 }
 671         }
 672
 673         if (audio->buf_refresh) {
 674                 audio->buf_refresh = 0;
 675                 dprintk("audqcelp_read: kick start pcm feedback again\n");
 676                 audqcelp_buffer_refresh(audio);
 677         }
 678
 679         mutex_unlock(&audio->read_lock);
 680
 681         if (buf > start)
 682                 rc = buf - start;
 683
 684         dprintk("audqcelp_read: read %d bytes\n", rc);
 685         return rc;
 686 }
 687
 688 static ssize_t audqcelp_write(struct file *file, const char __user *buf,
 689                            size_t count, loff_t *pos)
 690 {
 691         struct audio *audio = file->private_data;
 692         const char __user *start = buf;
 693         struct buffer *frame;
 694         size_t xfer;
 695         int rc = 0;
 696
 697         if (count & 1)
 698                 return -EINVAL;
 699         dprintk("audqcelp_write() \n");
 700         mutex_lock(&audio->write_lock);
 701         while (count > 0) {
 702                 frame = audio->out + audio->out_head;
 703                 rc = wait_event_interruptible(audio->write_wait,
 704                                               (frame->used == 0)
 705                                               || (audio->stopped));
 706                 dprintk("audqcelp_write() buffer available\n");
 707                 if (rc < 0)
 708                         break;
 709                 if (audio->stopped) {
 710                         rc = -EBUSY;
 711                         break;
 712                 }
 713                 xfer = (count > frame->size) ? frame->size : count;
 714                 if (copy_from_user(frame->data, buf, xfer)) {
 715                         rc = -EFAULT;
 716                         break;
 717                 }
 718
 719                 frame->used = xfer;
 720                 audio->out_head ^= 1;
 721                 count -= xfer;
 722                 buf += xfer;
 723
 724                 audqcelp_send_data(audio, 0);
 725
 726         }
 727         mutex_unlock(&audio->write_lock);
 728         if (buf > start)
 729                 return buf - start;
 730         return rc;
 731 }
 732
 733 static int audqcelp_release(struct inode *inode, struct file *file)
 734 {
 735         struct audio *audio = file->private_data;
 736
 737         dprintk("audqcelp_release()\n");
 738
 739         mutex_lock(&audio->lock);
 740         audqcelp_disable(audio);
 741         audqcelp_flush(audio);
 742         audqcelp_flush_pcm_buf(audio);
 743         msm_adsp_put(audio->audplay);
 744         audio->audplay = NULL;
 745         audio->opened = 0;
 746         if (audio->data)
 747                 dma_free_coherent(NULL, DMASZ, audio->data, audio->phys);
 748         audio->data = NULL;
 749         if (audio->read_data) {
 750                 dma_free_coherent(NULL,
 751                                  audio->in[0].size * audio->pcm_buf_count,
 752                                  audio->read_data, audio->read_phys);
 753                 audio->read_data = NULL;
 754         }
 755         audio->pcm_feedback = 0;
 756         mutex_unlock(&audio->lock);
 757         return 0;
 758 }
 759
 760 static int audqcelp_open(struct inode *inode, struct file *file)
 761 {
 762         struct audio *audio = &the_qcelp_audio;
 763         int rc;
 764
 765         mutex_lock(&audio->lock);
 766
 767         if (audio->opened) {
 768                 pr_err("audio: busy\n");
 769                 rc = -EBUSY;
 770                 goto done;
 771         }
 772
 773         audio->data = dma_alloc_coherent(NULL, DMASZ,
 774                                          &audio->phys, GFP_KERNEL);
 775         if (!audio->data) {
 776                 pr_err("audio: could not allocate DMA buffers\n");
 777                 rc = -ENOMEM;
 778                 goto done;
 779         }
 780
 781         rc = audmgr_open(&audio->audmgr);
 782         if (rc)
 783                 goto err;
 784
 785         rc = msm_adsp_get("AUDPLAY0TASK", &audio->audplay,
 786                 &audplay_adsp_ops_qcelp, audio);
 787         if (rc) {
 788                 pr_err("audio: failed to get audplay0 dsp module\n");
 789                 audmgr_close(&audio->audmgr);
 790                 goto err;
 791         }
 792
 793         audio->dec_id = 0;
 794
 795         audio->out[0].data = audio->data + 0;
 796         audio->out[0].addr = audio->phys + 0;
 797         audio->out[0].size = BUFSZ;
 798
 799         audio->out[1].data = audio->data + BUFSZ;
 800         audio->out[1].addr = audio->phys + BUFSZ;
 801         audio->out[1].size = BUFSZ;
 802
 803         audio->volume = 0x2000; /* Q13 1.0 */
 804
 805         audqcelp_flush(audio);
 806
 807         file->private_data = audio;
 808         audio->opened = 1;
 809         rc = 0;
 810 done:
 811         mutex_unlock(&audio->lock);
 812         return rc;
 813 err:
 814         dma_free_coherent(NULL, DMASZ, audio->data, audio->phys);
 815         mutex_unlock(&audio->lock);
 816         return rc;
 817 }
 818
 819 static struct file_operations audio_qcelp_fops = {
 820         .owner = THIS_MODULE,
 821         .open = audqcelp_open,
 822         .release = audqcelp_release,
 823         .read = audqcelp_read,
 824         .write = audqcelp_write,
 825         .unlocked_ioctl = audqcelp_ioctl,
 826 };
 827
 828 struct miscdevice audio_qcelp_misc = {
 829         .minor = MISC_DYNAMIC_MINOR,
 830         .name = "msm_qcelp",
 831         .fops = &audio_qcelp_fops,
 832 };
 833
 834 static int __init audqcelp_init(void)
 835 {
 836         mutex_init(&the_qcelp_audio.lock);
 837         mutex_init(&the_qcelp_audio.write_lock);
 838         mutex_init(&the_qcelp_audio.read_lock);
 839         spin_lock_init(&the_qcelp_audio.dsp_lock);
 840         init_waitqueue_head(&the_qcelp_audio.write_wait);
 841         init_waitqueue_head(&the_qcelp_audio.read_wait);
 842         the_qcelp_audio.read_data = NULL;
 843         return misc_register(&audio_qcelp_misc);
 844 }
 845
 846 static void __exit audqcelp_exit(void)
 847 {
 848         misc_deregister(&audio_qcelp_misc);
 849 }
 850
 851 module_init(audqcelp_init);
 852 module_exit(audqcelp_exit);
 853
 854 MODULE_DESCRIPTION("MSM QCELP 13K driver");
 855 MODULE_LICENSE("GPL v2");
 856 MODULE_AUTHOR("QUALCOMM");