drivers/staging/dream/qdsp5/audio_out.c

   1 /* arch/arm/mach-msm/qdsp5/audio_out.c
   2  *
   3  * pcm audio output device
   4  *
   5  * Copyright (C) 2008 Google, Inc.
   6  * Copyright (C) 2008 HTC Corporation
   7  *
   8  * This software is licensed under the terms of the GNU General Public
   9  * License version 2, as published by the Free Software Foundation, and
  10  * may be copied, distributed, and modified under those terms.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/fs.h>
  21 #include <linux/miscdevice.h>
  22 #include <linux/uaccess.h>
  23 #include <linux/kthread.h>
  24 #include <linux/wait.h>
  25 #include <linux/dma-mapping.h>
  26 #include <linux/debugfs.h>
  27 #include <linux/delay.h>
  28 #include <linux/wakelock.h>
  29 #include <linux/gfp.h>
  30
  31 #include <linux/msm_audio.h>
  32
  33 #include <asm/atomic.h>
  34 #include <asm/ioctls.h>
  35 #include <mach/msm_adsp.h>
  36
  37 #include "audmgr.h"
  38
  39 #include <mach/qdsp5/qdsp5audppcmdi.h>
  40 #include <mach/qdsp5/qdsp5audppmsg.h>
  41
  42 #include "evlog.h"
  43
  44 #define LOG_AUDIO_EVENTS 1
  45 #define LOG_AUDIO_FAULTS 0
  46
  47 enum {
  48         EV_NULL,
  49         EV_OPEN,
  50         EV_WRITE,
  51         EV_RETURN,
  52         EV_IOCTL,
  53         EV_WRITE_WAIT,
  54         EV_WAIT_EVENT,
  55         EV_FILL_BUFFER,
  56         EV_SEND_BUFFER,
  57         EV_DSP_EVENT,
  58         EV_ENABLE,
  59 };
  60
  61 #if (LOG_AUDIO_EVENTS != 1)
  62 static inline void LOG(unsigned id, unsigned arg) {}
  63 #else
  64 static const char *pcm_log_strings[] = {
  65         "NULL",
  66         "OPEN",
  67         "WRITE",
  68         "RETURN",
  69         "IOCTL",
  70         "WRITE_WAIT",
  71         "WAIT_EVENT",
  72         "FILL_BUFFER",
  73         "SEND_BUFFER",
  74         "DSP_EVENT",
  75         "ENABLE",
  76 };
  77
  78 DECLARE_LOG(pcm_log, 64, pcm_log_strings);
  79
  80 static int __init _pcm_log_init(void)
  81 {
  82         return ev_log_init(&pcm_log);
  83 }
  84 module_init(_pcm_log_init);
  85
  86 #define LOG(id,arg) ev_log_write(&pcm_log, id, arg)
  87 #endif
  88
  89
  90
  91
  92
  93 #define BUFSZ (960 * 5)
  94 #define DMASZ (BUFSZ * 2)
  95
  96 #define AUDPP_CMD_CFG_OBJ_UPDATE 0x8000
  97 #define AUDPP_CMD_EQ_FLAG_DIS   0x0000
  98 #define AUDPP_CMD_EQ_FLAG_ENA   -1
  99 #define AUDPP_CMD_IIR_FLAG_DIS    0x0000
 100 #define AUDPP_CMD_IIR_FLAG_ENA    -1
 101
 102 #define AUDPP_CMD_IIR_TUNING_FILTER  1
 103 #define AUDPP_CMD_EQUALIZER     2
 104 #define AUDPP_CMD_ADRC  3
 105
 106 #define ADRC_ENABLE  0x0001
 107 #define EQ_ENABLE    0x0002
 108 #define IIR_ENABLE   0x0004
 109
 110 struct adrc_filter {
 111         uint16_t compression_th;
 112         uint16_t compression_slope;
 113         uint16_t rms_time;
 114         uint16_t attack_const_lsw;
 115         uint16_t attack_const_msw;
 116         uint16_t release_const_lsw;
 117         uint16_t release_const_msw;
 118         uint16_t adrc_system_delay;
 119 };
 120
 121 struct eqalizer {
 122         uint16_t num_bands;
 123         uint16_t eq_params[132];
 124 };
 125
 126 struct rx_iir_filter {
 127         uint16_t num_bands;
 128         uint16_t iir_params[48];
 129 };
 130
 131 typedef struct {
 132         audpp_cmd_cfg_object_params_common common;
 133         uint16_t eq_flag;
 134         uint16_t num_bands;
 135         uint16_t eq_params[132];
 136 } audpp_cmd_cfg_object_params_eq;
 137
 138 typedef struct {
 139         audpp_cmd_cfg_object_params_common common;
 140         uint16_t active_flag;
 141         uint16_t num_bands;
 142         uint16_t iir_params[48];
 143 } audpp_cmd_cfg_object_params_rx_iir;
 144
 145 struct buffer {
 146         void *data;
 147         unsigned size;
 148         unsigned used;
 149         unsigned addr;
 150 };
 151
 152 struct audio {
 153         struct buffer out[2];
 154
 155         spinlock_t dsp_lock;
 156
 157         uint8_t out_head;
 158         uint8_t out_tail;
 159         uint8_t out_needed; /* number of buffers the dsp is waiting for */
 160
 161         atomic_t out_bytes;
 162
 163         struct mutex lock;
 164         struct mutex write_lock;
 165         wait_queue_head_t wait;
 166
 167         /* configuration to use on next enable */
 168         uint32_t out_sample_rate;
 169         uint32_t out_channel_mode;
 170         uint32_t out_weight;
 171         uint32_t out_buffer_size;
 172
 173         struct audmgr audmgr;
 174
 175         /* data allocated for various buffers */
 176         char *data;
 177         dma_addr_t phys;
 178
 179         int opened;
 180         int enabled;
 181         int running;
 182         int stopped; /* set when stopped, cleared on flush */
 183         unsigned volume;
 184
 185         struct wake_lock wakelock;
 186         struct wake_lock idlelock;
 187
 188         int adrc_enable;
 189         struct adrc_filter adrc;
 190
 191         int eq_enable;
 192         struct eqalizer eq;
 193
 194         int rx_iir_enable;
 195         struct rx_iir_filter iir;
 196 };
 197
 198 static void audio_prevent_sleep(struct audio *audio)
 199 {
 200         printk(KERN_INFO "++++++++++++++++++++++++++++++\n");
 201         wake_lock(&audio->wakelock);
 202         wake_lock(&audio->idlelock);
 203 }
 204
 205 static void audio_allow_sleep(struct audio *audio)
 206 {
 207         wake_unlock(&audio->wakelock);
 208         wake_unlock(&audio->idlelock);
 209         printk(KERN_INFO "------------------------------\n");
 210 }
 211
 212 static int audio_dsp_out_enable(struct audio *audio, int yes);
 213 static int audio_dsp_send_buffer(struct audio *audio, unsigned id, unsigned len);
 214 static int audio_dsp_set_adrc(struct audio *audio);
 215 static int audio_dsp_set_eq(struct audio *audio);
 216 static int audio_dsp_set_rx_iir(struct audio *audio);
 217
 218 static void audio_dsp_event(void *private, unsigned id, uint16_t *msg);
 219
 220 /* must be called with audio->lock held */
 221 static int audio_enable(struct audio *audio)
 222 {
 223         struct audmgr_config cfg;
 224         int rc;
 225
 226         pr_info("audio_enable()\n");
 227
 228         if (audio->enabled)
 229                 return 0;
 230
 231         /* refuse to start if we're not ready */
 232         if (!audio->out[0].used || !audio->out[1].used)
 233                 return -EIO;
 234
 235         /* we start buffers 0 and 1, so buffer 0 will be the
 236          * next one the dsp will want
 237          */
 238         audio->out_tail = 0;
 239         audio->out_needed = 0;
 240
 241         cfg.tx_rate = RPC_AUD_DEF_SAMPLE_RATE_NONE;
 242         cfg.rx_rate = RPC_AUD_DEF_SAMPLE_RATE_48000;
 243         cfg.def_method = RPC_AUD_DEF_METHOD_HOST_PCM;
 244         cfg.codec = RPC_AUD_DEF_CODEC_PCM;
 245         cfg.snd_method = RPC_SND_METHOD_MIDI;
 246
 247         audio_prevent_sleep(audio);
 248         rc = audmgr_enable(&audio->audmgr, &cfg);
 249         if (rc < 0) {
 250                 audio_allow_sleep(audio);
 251                 return rc;
 252         }
 253
 254         if (audpp_enable(-1, audio_dsp_event, audio)) {
 255                 pr_err("audio: audpp_enable() failed\n");
 256                 audmgr_disable(&audio->audmgr);
 257                 audio_allow_sleep(audio);
 258                 return -ENODEV;
 259         }
 260
 261         audio->enabled = 1;
 262         return 0;
 263 }
 264
 265 /* must be called with audio->lock held */
 266 static int audio_disable(struct audio *audio)
 267 {
 268         pr_info("audio_disable()\n");
 269         if (audio->enabled) {
 270                 audio->enabled = 0;
 271                 audio_dsp_out_enable(audio, 0);
 272
 273                 audpp_disable(-1, audio);
 274
 275                 wake_up(&audio->wait);
 276                 audmgr_disable(&audio->audmgr);
 277                 audio->out_needed = 0;
 278                 audio_allow_sleep(audio);
 279         }
 280         return 0;
 281 }
 282
 283 /* ------------------- dsp --------------------- */
 284 static void audio_dsp_event(void *private, unsigned id, uint16_t *msg)
 285 {
 286         struct audio *audio = private;
 287         struct buffer *frame;
 288         unsigned long flags;
 289
 290         LOG(EV_DSP_EVENT, id);
 291         switch (id) {
 292         case AUDPP_MSG_HOST_PCM_INTF_MSG: {
 293                 unsigned id = msg[2];
 294                 unsigned idx = msg[3] - 1;
 295
 296                 /* pr_info("audio_dsp_event: HOST_PCM id %d idx %d\n", id, idx); */
 297                 if (id != AUDPP_MSG_HOSTPCM_ID_ARM_RX) {
 298                         pr_err("bogus id\n");
 299                         break;
 300                 }
 301                 if (idx > 1) {
 302                         pr_err("bogus buffer idx\n");
 303                         break;
 304                 }
 305
 306                 spin_lock_irqsave(&audio->dsp_lock, flags);
 307                 if (audio->running) {
 308                         atomic_add(audio->out[idx].used, &audio->out_bytes);
 309                         audio->out[idx].used = 0;
 310
 311                         frame = audio->out + audio->out_tail;
 312                         if (frame->used) {
 313                                 audio_dsp_send_buffer(
 314                                         audio, audio->out_tail, frame->used);
 315                                 audio->out_tail ^= 1;
 316                         } else {
 317                                 audio->out_needed++;
 318                         }
 319                         wake_up(&audio->wait);
 320                 }
 321                 spin_unlock_irqrestore(&audio->dsp_lock, flags);
 322                 break;
 323         }
 324         case AUDPP_MSG_PCMDMAMISSED:
 325                 pr_info("audio_dsp_event: PCMDMAMISSED %d\n", msg[0]);
 326                 break;
 327         case AUDPP_MSG_CFG_MSG:
 328                 if (msg[0] == AUDPP_MSG_ENA_ENA) {
 329                         LOG(EV_ENABLE, 1);
 330                         pr_info("audio_dsp_event: CFG_MSG ENABLE\n");
 331                         audio->out_needed = 0;
 332                         audio->running = 1;
 333                         audpp_set_volume_and_pan(5, audio->volume, 0);
 334                         audio_dsp_set_adrc(audio);
 335                         audio_dsp_set_eq(audio);
 336                         audio_dsp_set_rx_iir(audio);
 337                         audio_dsp_out_enable(audio, 1);
 338                 } else if (msg[0] == AUDPP_MSG_ENA_DIS) {
 339                         LOG(EV_ENABLE, 0);
 340                         pr_info("audio_dsp_event: CFG_MSG DISABLE\n");
 341                         audio->running = 0;
 342                 } else {
 343                         pr_err("audio_dsp_event: CFG_MSG %d?\n", msg[0]);
 344                 }
 345                 break;
 346         default:
 347                 pr_err("audio_dsp_event: UNKNOWN (%d)\n", id);
 348         }
 349 }
 350
 351 static int audio_dsp_out_enable(struct audio *audio, int yes)
 352 {
 353         audpp_cmd_pcm_intf cmd;
 354
 355         memset(&cmd, 0, sizeof(cmd));
 356         cmd.cmd_id      = AUDPP_CMD_PCM_INTF_2;
 357         cmd.object_num  = AUDPP_CMD_PCM_INTF_OBJECT_NUM;
 358         cmd.config      = AUDPP_CMD_PCM_INTF_CONFIG_CMD_V;
 359         cmd.intf_type   = AUDPP_CMD_PCM_INTF_RX_ENA_ARMTODSP_V;
 360
 361         if (yes) {
 362                 cmd.write_buf1LSW       = audio->out[0].addr;
 363                 cmd.write_buf1MSW       = audio->out[0].addr >> 16;
 364                 cmd.write_buf1_len      = audio->out[0].size;
 365                 cmd.write_buf2LSW       = audio->out[1].addr;
 366                 cmd.write_buf2MSW       = audio->out[1].addr >> 16;
 367                 cmd.write_buf2_len      = audio->out[1].size;
 368                 cmd.arm_to_rx_flag      = AUDPP_CMD_PCM_INTF_ENA_V;
 369                 cmd.weight_decoder_to_rx = audio->out_weight;
 370                 cmd.weight_arm_to_rx    = 1;
 371                 cmd.partition_number_arm_to_dsp = 0;
 372                 cmd.sample_rate         = audio->out_sample_rate;
 373                 cmd.channel_mode        = audio->out_channel_mode;
 374         }
 375
 376         return audpp_send_queue2(&cmd, sizeof(cmd));
 377 }
 378
 379 static int audio_dsp_send_buffer(struct audio *audio, unsigned idx, unsigned len)
 380 {
 381         audpp_cmd_pcm_intf_send_buffer cmd;
 382
 383         cmd.cmd_id              = AUDPP_CMD_PCM_INTF_2;
 384         cmd.host_pcm_object     = AUDPP_CMD_PCM_INTF_OBJECT_NUM;
 385         cmd.config              = AUDPP_CMD_PCM_INTF_BUFFER_CMD_V;
 386         cmd.intf_type           = AUDPP_CMD_PCM_INTF_RX_ENA_ARMTODSP_V;
 387         cmd.dsp_to_arm_buf_id   = 0;
 388         cmd.arm_to_dsp_buf_id   = idx + 1;
 389         cmd.arm_to_dsp_buf_len  = len;
 390
 391         LOG(EV_SEND_BUFFER, idx);
 392         return audpp_send_queue2(&cmd, sizeof(cmd));
 393 }
 394
 395 static int audio_dsp_set_adrc(struct audio *audio)
 396 {
 397         audpp_cmd_cfg_object_params_adrc cmd;
 398
 399         memset(&cmd, 0, sizeof(cmd));
 400         cmd.common.comman_cfg = AUDPP_CMD_CFG_OBJ_UPDATE;
 401         cmd.common.command_type = AUDPP_CMD_ADRC;
 402
 403         if (audio->adrc_enable) {
 404                 cmd.adrc_flag = AUDPP_CMD_ADRC_FLAG_ENA;
 405                 cmd.compression_th = audio->adrc.compression_th;
 406                 cmd.compression_slope = audio->adrc.compression_slope;
 407                 cmd.rms_time = audio->adrc.rms_time;
 408                 cmd.attack_const_lsw = audio->adrc.attack_const_lsw;
 409                 cmd.attack_const_msw = audio->adrc.attack_const_msw;
 410                 cmd.release_const_lsw = audio->adrc.release_const_lsw;
 411                 cmd.release_const_msw = audio->adrc.release_const_msw;
 412                 cmd.adrc_system_delay = audio->adrc.adrc_system_delay;
 413         } else {
 414                 cmd.adrc_flag = AUDPP_CMD_ADRC_FLAG_DIS;
 415         }
 416         return audpp_send_queue3(&cmd, sizeof(cmd));
 417 }
 418
 419 static int audio_dsp_set_eq(struct audio *audio)
 420 {
 421         audpp_cmd_cfg_object_params_eq cmd;
 422
 423         memset(&cmd, 0, sizeof(cmd));
 424         cmd.common.comman_cfg = AUDPP_CMD_CFG_OBJ_UPDATE;
 425         cmd.common.command_type = AUDPP_CMD_EQUALIZER;
 426
 427         if (audio->eq_enable) {
 428                 cmd.eq_flag = AUDPP_CMD_EQ_FLAG_ENA;
 429                 cmd.num_bands = audio->eq.num_bands;
 430                 memcpy(&cmd.eq_params, audio->eq.eq_params,
 431                        sizeof(audio->eq.eq_params));
 432         } else {
 433                 cmd.eq_flag = AUDPP_CMD_EQ_FLAG_DIS;
 434         }
 435         return audpp_send_queue3(&cmd, sizeof(cmd));
 436 }
 437
 438 static int audio_dsp_set_rx_iir(struct audio *audio)
 439 {
 440         audpp_cmd_cfg_object_params_rx_iir cmd;
 441
 442         memset(&cmd, 0, sizeof(cmd));
 443         cmd.common.comman_cfg = AUDPP_CMD_CFG_OBJ_UPDATE;
 444         cmd.common.command_type = AUDPP_CMD_IIR_TUNING_FILTER;
 445
 446         if (audio->rx_iir_enable) {
 447                 cmd.active_flag = AUDPP_CMD_IIR_FLAG_ENA;
 448                 cmd.num_bands = audio->iir.num_bands;
 449                 memcpy(&cmd.iir_params, audio->iir.iir_params,
 450                        sizeof(audio->iir.iir_params));
 451         } else {
 452                 cmd.active_flag = AUDPP_CMD_IIR_FLAG_DIS;
 453         }
 454
 455         return audpp_send_queue3(&cmd, sizeof(cmd));
 456 }
 457
 458 /* ------------------- device --------------------- */
 459
 460 static int audio_enable_adrc(struct audio *audio, int enable)
 461 {
 462         if (audio->adrc_enable != enable) {
 463                 audio->adrc_enable = enable;
 464                 if (audio->running)
 465                         audio_dsp_set_adrc(audio);
 466         }
 467         return 0;
 468 }
 469
 470 static int audio_enable_eq(struct audio *audio, int enable)
 471 {
 472         if (audio->eq_enable != enable) {
 473                 audio->eq_enable = enable;
 474                 if (audio->running)
 475                         audio_dsp_set_eq(audio);
 476         }
 477         return 0;
 478 }
 479
 480 static int audio_enable_rx_iir(struct audio *audio, int enable)
 481 {
 482         if (audio->rx_iir_enable != enable) {
 483                 audio->rx_iir_enable = enable;
 484                 if (audio->running)
 485                         audio_dsp_set_rx_iir(audio);
 486         }
 487         return 0;
 488 }
 489
 490 static void audio_flush(struct audio *audio)
 491 {
 492         audio->out[0].used = 0;
 493         audio->out[1].used = 0;
 494         audio->out_head = 0;
 495         audio->out_tail = 0;
 496         audio->stopped = 0;
 497 }
 498
 499 static long audio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 500 {
 501         struct audio *audio = file->private_data;
 502         int rc;
 503
 504         if (cmd == AUDIO_GET_STATS) {
 505                 struct msm_audio_stats stats;
 506                 stats.byte_count = atomic_read(&audio->out_bytes);
 507                 if (copy_to_user((void*) arg, &stats, sizeof(stats)))
 508                         return -EFAULT;
 509                 return 0;
 510         }
 511         if (cmd == AUDIO_SET_VOLUME) {
 512                 unsigned long flags;
 513                 spin_lock_irqsave(&audio->dsp_lock, flags);
 514                 audio->volume = arg;
 515                 if (audio->running)
 516                         audpp_set_volume_and_pan(6, arg, 0);
 517                 spin_unlock_irqrestore(&audio->dsp_lock, flags);
 518         }
 519
 520         LOG(EV_IOCTL, cmd);
 521         mutex_lock(&audio->lock);
 522         switch (cmd) {
 523         case AUDIO_START:
 524                 rc = audio_enable(audio);
 525                 break;
 526         case AUDIO_STOP:
 527                 rc = audio_disable(audio);
 528                 audio->stopped = 1;
 529                 break;
 530         case AUDIO_FLUSH:
 531                 if (audio->stopped) {
 532                         /* Make sure we're stopped and we wake any threads
 533                          * that might be blocked holding the write_lock.
 534                          * While audio->stopped write threads will always
 535                          * exit immediately.
 536                          */
 537                         wake_up(&audio->wait);
 538                         mutex_lock(&audio->write_lock);
 539                         audio_flush(audio);
 540                         mutex_unlock(&audio->write_lock);
 541                 }
 542         case AUDIO_SET_CONFIG: {
 543                 struct msm_audio_config config;
 544                 if (copy_from_user(&config, (void*) arg, sizeof(config))) {
 545                         rc = -EFAULT;
 546                         break;
 547                 }
 548                 if (config.channel_count == 1) {
 549                         config.channel_count = AUDPP_CMD_PCM_INTF_MONO_V;
 550                 } else if (config.channel_count == 2) {
 551                         config.channel_count= AUDPP_CMD_PCM_INTF_STEREO_V;
 552                 } else {
 553                         rc = -EINVAL;
 554                         break;
 555                 }
 556                 audio->out_sample_rate = config.sample_rate;
 557                 audio->out_channel_mode = config.channel_count;
 558                 rc = 0;
 559                 break;
 560         }
 561         case AUDIO_GET_CONFIG: {
 562                 struct msm_audio_config config;
 563                 config.buffer_size = BUFSZ;
 564                 config.buffer_count = 2;
 565                 config.sample_rate = audio->out_sample_rate;
 566                 if (audio->out_channel_mode == AUDPP_CMD_PCM_INTF_MONO_V) {
 567                         config.channel_count = 1;
 568                 } else {
 569                         config.channel_count = 2;
 570                 }
 571                 config.unused[0] = 0;
 572                 config.unused[1] = 0;
 573                 config.unused[2] = 0;
 574                 config.unused[3] = 0;
 575                 if (copy_to_user((void*) arg, &config, sizeof(config))) {
 576                         rc = -EFAULT;
 577                 } else {
 578                         rc = 0;
 579                 }
 580                 break;
 581         }
 582         default:
 583                 rc = -EINVAL;
 584         }
 585         mutex_unlock(&audio->lock);
 586         return rc;
 587 }
 588
 589 static ssize_t audio_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
 590 {
 591         return -EINVAL;
 592 }
 593
 594 static inline int rt_policy(int policy)
 595 {
 596         if (unlikely(policy == SCHED_FIFO) || unlikely(policy == SCHED_RR))
 597                 return 1;
 598         return 0;
 599 }
 600
 601 static inline int task_has_rt_policy(struct task_struct *p)
 602 {
 603         return rt_policy(p->policy);
 604 }
 605
 606 static ssize_t audio_write(struct file *file, const char __user *buf,
 607                            size_t count, loff_t *pos)
 608 {
 609         struct sched_param s = { .sched_priority = 1 };
 610         struct audio *audio = file->private_data;
 611         unsigned long flags;
 612         const char __user *start = buf;
 613         struct buffer *frame;
 614         size_t xfer;
 615         int old_prio = current->rt_priority;
 616         int old_policy = current->policy;
 617         int cap_nice = cap_raised(current_cap(), CAP_SYS_NICE);
 618         int rc = 0;
 619
 620         LOG(EV_WRITE, count | (audio->running << 28) | (audio->stopped << 24));
 621
 622         /* just for this write, set us real-time */
 623         if (!task_has_rt_policy(current)) {
 624                 struct cred *new = prepare_creds();
 625                 cap_raise(new->cap_effective, CAP_SYS_NICE);
 626                 commit_creds(new);
 627                 sched_setscheduler(current, SCHED_RR, &s);
 628         }
 629
 630         mutex_lock(&audio->write_lock);
 631         while (count > 0) {
 632                 frame = audio->out + audio->out_head;
 633
 634                 LOG(EV_WAIT_EVENT, 0);
 635                 rc = wait_event_interruptible(audio->wait,
 636                                               (frame->used == 0) || (audio->stopped));
 637                 LOG(EV_WAIT_EVENT, 1);
 638
 639                 if (rc < 0)
 640                         break;
 641                 if (audio->stopped) {
 642                         rc = -EBUSY;
 643                         break;
 644                 }
 645                 xfer = count > frame->size ? frame->size : count;
 646                 if (copy_from_user(frame->data, buf, xfer)) {
 647                         rc = -EFAULT;
 648                         break;
 649                 }
 650                 frame->used = xfer;
 651                 audio->out_head ^= 1;
 652                 count -= xfer;
 653                 buf += xfer;
 654
 655                 spin_lock_irqsave(&audio->dsp_lock, flags);
 656                 LOG(EV_FILL_BUFFER, audio->out_head ^ 1);
 657                 frame = audio->out + audio->out_tail;
 658                 if (frame->used && audio->out_needed) {
 659                         audio_dsp_send_buffer(audio, audio->out_tail, frame->used);
 660                         audio->out_tail ^= 1;
 661                         audio->out_needed--;
 662                 }
 663                 spin_unlock_irqrestore(&audio->dsp_lock, flags);
 664         }
 665
 666         mutex_unlock(&audio->write_lock);
 667
 668         /* restore scheduling policy and priority */
 669         if (!rt_policy(old_policy)) {
 670                 struct sched_param v = { .sched_priority = old_prio };
 671                 sched_setscheduler(current, old_policy, &v);
 672                 if (likely(!cap_nice)) {
 673                         struct cred *new = prepare_creds();
 674                         cap_lower(new->cap_effective, CAP_SYS_NICE);
 675                         commit_creds(new);
 676                         sched_setscheduler(current, SCHED_RR, &s);
 677                 }
 678         }
 679
 680         LOG(EV_RETURN,(buf > start) ? (buf - start) : rc);
 681         if (buf > start)
 682                 return buf - start;
 683         return rc;
 684 }
 685
 686 static int audio_release(struct inode *inode, struct file *file)
 687 {
 688         struct audio *audio = file->private_data;
 689
 690         LOG(EV_OPEN, 0);
 691         mutex_lock(&audio->lock);
 692         audio_disable(audio);
 693         audio_flush(audio);
 694         audio->opened = 0;
 695         mutex_unlock(&audio->lock);
 696         return 0;
 697 }
 698
 699 static struct audio the_audio;
 700
 701 static int audio_open(struct inode *inode, struct file *file)
 702 {
 703         struct audio *audio = &the_audio;
 704         int rc;
 705
 706         mutex_lock(&audio->lock);
 707
 708         if (audio->opened) {
 709                 pr_err("audio: busy\n");
 710                 rc = -EBUSY;
 711                 goto done;
 712         }
 713
 714         if (!audio->data) {
 715                 audio->data = dma_alloc_coherent(NULL, DMASZ,
 716                                                  &audio->phys, GFP_KERNEL);
 717                 if (!audio->data) {
 718                         pr_err("audio: could not allocate DMA buffers\n");
 719                         rc = -ENOMEM;
 720                         goto done;
 721                 }
 722         }
 723
 724         rc = audmgr_open(&audio->audmgr);
 725         if (rc)
 726                 goto done;
 727
 728         audio->out_buffer_size = BUFSZ;
 729         audio->out_sample_rate = 44100;
 730         audio->out_channel_mode = AUDPP_CMD_PCM_INTF_STEREO_V;
 731         audio->out_weight = 100;
 732
 733         audio->out[0].data = audio->data + 0;
 734         audio->out[0].addr = audio->phys + 0;
 735         audio->out[0].size = BUFSZ;
 736
 737         audio->out[1].data = audio->data + BUFSZ;
 738         audio->out[1].addr = audio->phys + BUFSZ;
 739         audio->out[1].size = BUFSZ;
 740
 741         audio->volume = 0x2000;
 742
 743         audio_flush(audio);
 744
 745         file->private_data = audio;
 746         audio->opened = 1;
 747         rc = 0;
 748         LOG(EV_OPEN, 1);
 749 done:
 750         mutex_unlock(&audio->lock);
 751         return rc;
 752 }
 753
 754 static long audpp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 755 {
 756         struct audio *audio = file->private_data;
 757         int rc = 0, enable;
 758         uint16_t enable_mask;
 759
 760         mutex_lock(&audio->lock);
 761         switch (cmd) {
 762         case AUDIO_ENABLE_AUDPP:
 763                 if (copy_from_user(&enable_mask, (void *) arg, sizeof(enable_mask)))
 764                         goto out_fault;
 765
 766                 enable = (enable_mask & ADRC_ENABLE)? 1 : 0;
 767                 audio_enable_adrc(audio, enable);
 768                 enable = (enable_mask & EQ_ENABLE)? 1 : 0;
 769                 audio_enable_eq(audio, enable);
 770                 enable = (enable_mask & IIR_ENABLE)? 1 : 0;
 771                 audio_enable_rx_iir(audio, enable);
 772                 break;
 773
 774         case AUDIO_SET_ADRC:
 775                 if (copy_from_user(&audio->adrc, (void*) arg, sizeof(audio->adrc)))
 776                         goto out_fault;
 777                 break;
 778
 779         case AUDIO_SET_EQ:
 780                 if (copy_from_user(&audio->eq, (void*) arg, sizeof(audio->eq)))
 781                         goto out_fault;
 782                 break;
 783
 784         case AUDIO_SET_RX_IIR:
 785                 if (copy_from_user(&audio->iir, (void*) arg, sizeof(audio->iir)))
 786                         goto out_fault;
 787                 break;
 788
 789         default:
 790                 rc = -EINVAL;
 791         }
 792
 793         goto out;
 794
 795  out_fault:
 796         rc = -EFAULT;
 797  out:
 798         mutex_unlock(&audio->lock);
 799         return rc;
 800 }
 801
 802 static int audpp_open(struct inode *inode, struct file *file)
 803 {
 804         struct audio *audio = &the_audio;
 805
 806         file->private_data = audio;
 807         return 0;
 808 }
 809
 810 static struct file_operations audio_fops = {
 811         .owner          = THIS_MODULE,
 812         .open           = audio_open,
 813         .release        = audio_release,
 814         .read           = audio_read,
 815         .write          = audio_write,
 816         .unlocked_ioctl = audio_ioctl,
 817 };
 818
 819 static struct file_operations audpp_fops = {
 820         .owner          = THIS_MODULE,
 821         .open           = audpp_open,
 822         .unlocked_ioctl = audpp_ioctl,
 823 };
 824
 825 struct miscdevice audio_misc = {
 826         .minor  = MISC_DYNAMIC_MINOR,
 827         .name   = "msm_pcm_out",
 828         .fops   = &audio_fops,
 829 };
 830
 831 struct miscdevice audpp_misc = {
 832         .minor  = MISC_DYNAMIC_MINOR,
 833         .name   = "msm_pcm_ctl",
 834         .fops   = &audpp_fops,
 835 };
 836
 837 static int __init audio_init(void)
 838 {
 839         mutex_init(&the_audio.lock);
 840         mutex_init(&the_audio.write_lock);
 841         spin_lock_init(&the_audio.dsp_lock);
 842         init_waitqueue_head(&the_audio.wait);
 843         wake_lock_init(&the_audio.wakelock, WAKE_LOCK_SUSPEND, "audio_pcm");
 844         wake_lock_init(&the_audio.idlelock, WAKE_LOCK_IDLE, "audio_pcm_idle");
 845         return (misc_register(&audio_misc) || misc_register(&audpp_misc));
 846 }
 847
 848 device_initcall(audio_init);