drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c

   1 /*****************************************************************************
   2  * Copyright 2011 Broadcom Corporation.  All rights reserved.
   3  *
   4  * Unless you and Broadcom execute a separate written software license
   5  * agreement governing use of this software, this software is licensed to you
   6  * under the terms of the GNU General Public License version 2, available at
   7  * http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
   8  *
   9  * Notwithstanding the above, under no circumstances may you combine this
  10  * software in any way with any other Broadcom software provided under a
  11  * license other than the GPL, without Broadcom's express prior written
  12  * consent.
  13  *****************************************************************************/
  14
  15 #include <linux/device.h>
  16 #include <sound/core.h>
  17 #include <sound/initval.h>
  18 #include <sound/pcm.h>
  19 #include <linux/io.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/fs.h>
  22 #include <linux/file.h>
  23 #include <linux/mm.h>
  24 #include <linux/syscalls.h>
  25 #include <linux/uaccess.h>
  26 #include <linux/slab.h>
  27 #include <linux/delay.h>
  28 #include <linux/atomic.h>
  29 #include <linux/module.h>
  30 #include <linux/completion.h>
  31
  32 #include "bcm2835.h"
  33
  34 /* ---- Include Files -------------------------------------------------------- */
  35
  36 #include "interface/vchi/vchi.h"
  37 #include "vc_vchi_audioserv_defs.h"
  38
  39 /* ---- Private Constants and Types ------------------------------------------ */
  40
  41 #define BCM2835_AUDIO_STOP           0
  42 #define BCM2835_AUDIO_START          1
  43 #define BCM2835_AUDIO_WRITE          2
  44
  45 /* Logging macros (for remapping to other logging mechanisms, i.e., printf) */
  46 #ifdef AUDIO_DEBUG_ENABLE
  47 #define LOG_ERR(fmt, arg...)   pr_err("%s:%d " fmt, __func__, __LINE__, ##arg)
  48 #define LOG_WARN(fmt, arg...)  pr_info("%s:%d " fmt, __func__, __LINE__, ##arg)
  49 #define LOG_INFO(fmt, arg...)  pr_info("%s:%d " fmt, __func__, __LINE__, ##arg)
  50 #define LOG_DBG(fmt, arg...)   pr_info("%s:%d " fmt, __func__, __LINE__, ##arg)
  51 #else
  52 #define LOG_ERR(fmt, arg...)   pr_err("%s:%d " fmt, __func__, __LINE__, ##arg)
  53 #define LOG_WARN(fmt, arg...)    no_printk(fmt, ##arg)
  54 #define LOG_INFO(fmt, arg...)    no_printk(fmt, ##arg)
  55 #define LOG_DBG(fmt, arg...)     no_printk(fmt, ##arg)
  56 #endif
  57
  58 struct bcm2835_audio_instance {
  59         unsigned int num_connections;
  60         VCHI_SERVICE_HANDLE_T vchi_handle[VCHI_MAX_NUM_CONNECTIONS];
  61         struct completion msg_avail_comp;
  62         struct mutex vchi_mutex;
  63         struct bcm2835_alsa_stream *alsa_stream;
  64         int result;
  65         short peer_version;
  66 };
  67
  68 static bool force_bulk;
  69
  70 /* ---- Private Variables ---------------------------------------------------- */
  71
  72 /* ---- Private Function Prototypes ------------------------------------------ */
  73
  74 /* ---- Private Functions ---------------------------------------------------- */
  75
  76 static int bcm2835_audio_stop_worker(struct bcm2835_alsa_stream *alsa_stream);
  77 static int bcm2835_audio_start_worker(struct bcm2835_alsa_stream *alsa_stream);
  78 static int bcm2835_audio_write_worker(struct bcm2835_alsa_stream *alsa_stream,
  79                                       unsigned int count, void *src);
  80
  81 // Routine to send a message across a service
  82
  83 static int
  84 bcm2835_vchi_msg_queue(VCHI_SERVICE_HANDLE_T handle,
  85                        void *data,
  86                        unsigned int size)
  87 {
  88         return vchi_queue_kernel_message(handle,
  89                                          data,
  90                                          size);
  91 }
  92
  93 static const u32 BCM2835_AUDIO_WRITE_COOKIE1 = ('B' << 24 | 'C' << 16 |
  94                                                 'M' << 8  | 'A');
  95 static const u32 BCM2835_AUDIO_WRITE_COOKIE2 = ('D' << 24 | 'A' << 16 |
  96                                                 'T' << 8  | 'A');
  97
  98 struct bcm2835_audio_work {
  99         struct work_struct my_work;
 100         struct bcm2835_alsa_stream *alsa_stream;
 101         int cmd;
 102         void *src;
 103         unsigned int count;
 104 };
 105
 106 static void my_wq_function(struct work_struct *work)
 107 {
 108         struct bcm2835_audio_work *w =
 109                 container_of(work, struct bcm2835_audio_work, my_work);
 110         int ret = -9;
 111
 112         switch (w->cmd) {
 113         case BCM2835_AUDIO_START:
 114                 ret = bcm2835_audio_start_worker(w->alsa_stream);
 115                 break;
 116         case BCM2835_AUDIO_STOP:
 117                 ret = bcm2835_audio_stop_worker(w->alsa_stream);
 118                 break;
 119         case BCM2835_AUDIO_WRITE:
 120                 ret = bcm2835_audio_write_worker(w->alsa_stream, w->count,
 121                                                  w->src);
 122                 break;
 123         default:
 124                 LOG_ERR(" Unexpected work: %p:%d\n", w->alsa_stream, w->cmd);
 125                 break;
 126         }
 127         kfree((void *)work);
 128 }
 129
 130 int bcm2835_audio_start(struct bcm2835_alsa_stream *alsa_stream)
 131 {
 132         if (alsa_stream->my_wq) {
 133                 struct bcm2835_audio_work *work;
 134
 135                 work = kmalloc(sizeof(*work), GFP_ATOMIC);
 136                 /*--- Queue some work (item 1) ---*/
 137                 if (!work) {
 138                         LOG_ERR(" .. Error: NULL work kmalloc\n");
 139                         return -ENOMEM;
 140                 }
 141                 INIT_WORK(&work->my_work, my_wq_function);
 142                 work->alsa_stream = alsa_stream;
 143                 work->cmd = BCM2835_AUDIO_START;
 144                 if (!queue_work(alsa_stream->my_wq, &work->my_work)) {
 145                         kfree(work);
 146                         return -EBUSY;
 147                 }
 148         }
 149         return 0;
 150 }
 151
 152 int bcm2835_audio_stop(struct bcm2835_alsa_stream *alsa_stream)
 153 {
 154         if (alsa_stream->my_wq) {
 155                 struct bcm2835_audio_work *work;
 156
 157                 work = kmalloc(sizeof(*work), GFP_ATOMIC);
 158                 /*--- Queue some work (item 1) ---*/
 159                 if (!work) {
 160                         LOG_ERR(" .. Error: NULL work kmalloc\n");
 161                         return -ENOMEM;
 162                 }
 163                 INIT_WORK(&work->my_work, my_wq_function);
 164                 work->alsa_stream = alsa_stream;
 165                 work->cmd = BCM2835_AUDIO_STOP;
 166                 if (!queue_work(alsa_stream->my_wq, &work->my_work)) {
 167                         kfree(work);
 168                         return -EBUSY;
 169                 }
 170         }
 171         return 0;
 172 }
 173
 174 int bcm2835_audio_write(struct bcm2835_alsa_stream *alsa_stream,
 175                         unsigned int count, void *src)
 176 {
 177         if (alsa_stream->my_wq) {
 178                 struct bcm2835_audio_work *work;
 179
 180                 work = kmalloc(sizeof(*work), GFP_ATOMIC);
 181                 /*--- Queue some work (item 1) ---*/
 182                 if (!work) {
 183                         LOG_ERR(" .. Error: NULL work kmalloc\n");
 184                         return -ENOMEM;
 185                 }
 186                 INIT_WORK(&work->my_work, my_wq_function);
 187                 work->alsa_stream = alsa_stream;
 188                 work->cmd = BCM2835_AUDIO_WRITE;
 189                 work->src = src;
 190                 work->count = count;
 191                 if (!queue_work(alsa_stream->my_wq, &work->my_work)) {
 192                         kfree(work);
 193                         return -EBUSY;
 194                 }
 195         }
 196         return 0;
 197 }
 198
 199 static void my_workqueue_init(struct bcm2835_alsa_stream *alsa_stream)
 200 {
 201         alsa_stream->my_wq = alloc_workqueue("my_queue", WQ_HIGHPRI, 1);
 202 }
 203
 204 static void my_workqueue_quit(struct bcm2835_alsa_stream *alsa_stream)
 205 {
 206         if (alsa_stream->my_wq) {
 207                 flush_workqueue(alsa_stream->my_wq);
 208                 destroy_workqueue(alsa_stream->my_wq);
 209                 alsa_stream->my_wq = NULL;
 210         }
 211 }
 212
 213 static void audio_vchi_callback(void *param,
 214                                 const VCHI_CALLBACK_REASON_T reason,
 215                                 void *msg_handle)
 216 {
 217         struct bcm2835_audio_instance *instance = param;
 218         int status;
 219         int msg_len;
 220         struct vc_audio_msg m;
 221
 222         if (reason != VCHI_CALLBACK_MSG_AVAILABLE)
 223                 return;
 224
 225         if (!instance) {
 226                 LOG_ERR(" .. instance is null\n");
 227                 BUG();
 228                 return;
 229         }
 230         if (!instance->vchi_handle[0]) {
 231                 LOG_ERR(" .. instance->vchi_handle[0] is null\n");
 232                 BUG();
 233                 return;
 234         }
 235         status = vchi_msg_dequeue(instance->vchi_handle[0],
 236                                   &m, sizeof(m), &msg_len, VCHI_FLAGS_NONE);
 237         if (m.type == VC_AUDIO_MSG_TYPE_RESULT) {
 238                 LOG_DBG(" .. instance=%p, m.type=VC_AUDIO_MSG_TYPE_RESULT, success=%d\n",
 239                         instance, m.u.result.success);
 240                 instance->result = m.u.result.success;
 241                 complete(&instance->msg_avail_comp);
 242         } else if (m.type == VC_AUDIO_MSG_TYPE_COMPLETE) {
 243                 struct bcm2835_alsa_stream *alsa_stream = instance->alsa_stream;
 244
 245                 LOG_DBG(" .. instance=%p, m.type=VC_AUDIO_MSG_TYPE_COMPLETE, complete=%d\n",
 246                         instance, m.u.complete.count);
 247                 if (m.u.complete.cookie1 != BCM2835_AUDIO_WRITE_COOKIE1 ||
 248                     m.u.complete.cookie2 != BCM2835_AUDIO_WRITE_COOKIE2)
 249                         LOG_ERR(" .. response is corrupt\n");
 250                 else if (alsa_stream) {
 251                         atomic_add(m.u.complete.count,
 252                                    &alsa_stream->retrieved);
 253                         bcm2835_playback_fifo(alsa_stream);
 254                 } else {
 255                         LOG_ERR(" .. unexpected alsa_stream=%p\n",
 256                                 alsa_stream);
 257                 }
 258         } else {
 259                 LOG_ERR(" .. unexpected m.type=%d\n", m.type);
 260         }
 261 }
 262
 263 static struct bcm2835_audio_instance *
 264 vc_vchi_audio_init(VCHI_INSTANCE_T vchi_instance,
 265                    VCHI_CONNECTION_T **vchi_connections,
 266                    unsigned int num_connections)
 267 {
 268         unsigned int i;
 269         struct bcm2835_audio_instance *instance;
 270         int status;
 271         int ret;
 272
 273         LOG_DBG("%s: start", __func__);
 274
 275         if (num_connections > VCHI_MAX_NUM_CONNECTIONS) {
 276                 LOG_ERR("%s: unsupported number of connections %u (max=%u)\n",
 277                         __func__, num_connections, VCHI_MAX_NUM_CONNECTIONS);
 278
 279                 return ERR_PTR(-EINVAL);
 280         }
 281         /* Allocate memory for this instance */
 282         instance = kzalloc(sizeof(*instance), GFP_KERNEL);
 283         if (!instance)
 284                 return ERR_PTR(-ENOMEM);
 285
 286         instance->num_connections = num_connections;
 287
 288         /* Create a lock for exclusive, serialized VCHI connection access */
 289         mutex_init(&instance->vchi_mutex);
 290         /* Open the VCHI service connections */
 291         for (i = 0; i < num_connections; i++) {
 292                 SERVICE_CREATION_T params = {
 293                         .version                = VCHI_VERSION_EX(VC_AUDIOSERV_VER, VC_AUDIOSERV_MIN_VER),
 294                         .service_id             = VC_AUDIO_SERVER_NAME,
 295                         .connection             = vchi_connections[i],
 296                         .rx_fifo_size           = 0,
 297                         .tx_fifo_size           = 0,
 298                         .callback               = audio_vchi_callback,
 299                         .callback_param         = instance,
 300                         .want_unaligned_bulk_rx = 1, //TODO: remove VCOS_FALSE
 301                         .want_unaligned_bulk_tx = 1, //TODO: remove VCOS_FALSE
 302                         .want_crc               = 0
 303                 };
 304
 305                 LOG_DBG("%s: about to open %i\n", __func__, i);
 306                 status = vchi_service_open(vchi_instance, &params,
 307                                            &instance->vchi_handle[i]);
 308
 309                 LOG_DBG("%s: opened %i: %p=%d\n", __func__, i, instance->vchi_handle[i], status);
 310                 if (status) {
 311                         LOG_ERR("%s: failed to open VCHI service connection (status=%d)\n",
 312                                 __func__, status);
 313                         ret = -EPERM;
 314                         goto err_close_services;
 315                 }
 316                 /* Finished with the service for now */
 317                 vchi_service_release(instance->vchi_handle[i]);
 318         }
 319
 320         LOG_DBG("%s: okay\n", __func__);
 321         return instance;
 322
 323 err_close_services:
 324         for (i = 0; i < instance->num_connections; i++) {
 325                 LOG_ERR("%s: closing %i: %p\n", __func__, i, instance->vchi_handle[i]);
 326                 if (instance->vchi_handle[i])
 327                         vchi_service_close(instance->vchi_handle[i]);
 328         }
 329
 330         kfree(instance);
 331         LOG_ERR("%s: error\n", __func__);
 332
 333         return ERR_PTR(ret);
 334 }
 335
 336 static int vc_vchi_audio_deinit(struct bcm2835_audio_instance *instance)
 337 {
 338         unsigned int i;
 339
 340
 341         if (!instance) {
 342                 LOG_ERR("%s: invalid handle %p\n", __func__, instance);
 343
 344                 return -1;
 345         }
 346
 347         LOG_DBG(" .. about to lock (%d)\n", instance->num_connections);
 348         if (mutex_lock_interruptible(&instance->vchi_mutex)) {
 349                 LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
 350                         instance->num_connections);
 351                 return -EINTR;
 352         }
 353
 354         /* Close all VCHI service connections */
 355         for (i = 0; i < instance->num_connections; i++) {
 356                 int status;
 357
 358                 LOG_DBG(" .. %i:closing %p\n", i, instance->vchi_handle[i]);
 359                 vchi_service_use(instance->vchi_handle[i]);
 360
 361                 status = vchi_service_close(instance->vchi_handle[i]);
 362                 if (status) {
 363                         LOG_DBG("%s: failed to close VCHI service connection (status=%d)\n",
 364                                 __func__, status);
 365                 }
 366         }
 367
 368         mutex_unlock(&instance->vchi_mutex);
 369
 370         kfree(instance);
 371
 372
 373         return 0;
 374 }
 375
 376 static int bcm2835_audio_open_connection(struct bcm2835_alsa_stream *alsa_stream)
 377 {
 378         static VCHI_INSTANCE_T vchi_instance;
 379         static VCHI_CONNECTION_T *vchi_connection;
 380         static int initted;
 381         struct bcm2835_audio_instance *instance =
 382                 (struct bcm2835_audio_instance *)alsa_stream->instance;
 383         int ret;
 384
 385
 386         LOG_INFO("%s: start\n", __func__);
 387         BUG_ON(instance);
 388         if (instance) {
 389                 LOG_ERR("%s: VCHI instance already open (%p)\n",
 390                         __func__, instance);
 391                 instance->alsa_stream = alsa_stream;
 392                 alsa_stream->instance = instance;
 393                 return 0;
 394         }
 395
 396         /* Initialize and create a VCHI connection */
 397         if (!initted) {
 398                 ret = vchi_initialise(&vchi_instance);
 399                 if (ret) {
 400                         LOG_ERR("%s: failed to initialise VCHI instance (ret=%d)\n",
 401                                 __func__, ret);
 402
 403                         return -EIO;
 404                 }
 405                 ret = vchi_connect(NULL, 0, vchi_instance);
 406                 if (ret) {
 407                         LOG_ERR("%s: failed to connect VCHI instance (ret=%d)\n",
 408                                 __func__, ret);
 409
 410                         kfree(vchi_instance);
 411                         return -EIO;
 412                 }
 413                 initted = 1;
 414         }
 415
 416         /* Initialize an instance of the audio service */
 417         instance = vc_vchi_audio_init(vchi_instance, &vchi_connection, 1);
 418
 419         if (IS_ERR(instance)) {
 420                 LOG_ERR("%s: failed to initialize audio service\n", __func__);
 421
 422                 /* vchi_instance is retained for use the next time. */
 423                 return PTR_ERR(instance);
 424         }
 425
 426         instance->alsa_stream = alsa_stream;
 427         alsa_stream->instance = instance;
 428
 429         LOG_DBG(" success !\n");
 430
 431         return 0;
 432 }
 433
 434 int bcm2835_audio_open(struct bcm2835_alsa_stream *alsa_stream)
 435 {
 436         struct bcm2835_audio_instance *instance;
 437         struct vc_audio_msg m;
 438         int status;
 439         int ret;
 440
 441
 442         my_workqueue_init(alsa_stream);
 443
 444         ret = bcm2835_audio_open_connection(alsa_stream);
 445         if (ret)
 446                 goto free_wq;
 447
 448         instance = alsa_stream->instance;
 449         LOG_DBG(" instance (%p)\n", instance);
 450
 451         if (mutex_lock_interruptible(&instance->vchi_mutex)) {
 452                 LOG_DBG("Interrupted whilst waiting for lock on (%d)\n", instance->num_connections);
 453                 ret = -EINTR;
 454                 goto free_wq;
 455         }
 456         vchi_service_use(instance->vchi_handle[0]);
 457
 458         m.type = VC_AUDIO_MSG_TYPE_OPEN;
 459
 460         /* Send the message to the videocore */
 461         status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
 462                                         &m, sizeof(m));
 463
 464         if (status) {
 465                 LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
 466                         __func__, status);
 467
 468                 ret = -1;
 469                 goto unlock;
 470         }
 471
 472         ret = 0;
 473
 474 unlock:
 475         vchi_service_release(instance->vchi_handle[0]);
 476         mutex_unlock(&instance->vchi_mutex);
 477
 478 free_wq:
 479         if (ret)
 480                 destroy_workqueue(alsa_stream->my_wq);
 481
 482         return ret;
 483 }
 484
 485 static int bcm2835_audio_set_ctls_chan(struct bcm2835_alsa_stream *alsa_stream,
 486                                        struct bcm2835_chip *chip)
 487 {
 488         struct vc_audio_msg m;
 489         struct bcm2835_audio_instance *instance = alsa_stream->instance;
 490         int status;
 491         int ret;
 492
 493
 494         LOG_INFO(" Setting ALSA dest(%d), volume(%d)\n",
 495                  chip->dest, chip->volume);
 496
 497         if (mutex_lock_interruptible(&instance->vchi_mutex)) {
 498                 LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
 499                         instance->num_connections);
 500                 return -EINTR;
 501         }
 502         vchi_service_use(instance->vchi_handle[0]);
 503
 504         instance->result = -1;
 505
 506         m.type = VC_AUDIO_MSG_TYPE_CONTROL;
 507         m.u.control.dest = chip->dest;
 508         m.u.control.volume = chip->volume;
 509
 510         /* Create the message available completion */
 511         init_completion(&instance->msg_avail_comp);
 512
 513         /* Send the message to the videocore */
 514         status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
 515                                         &m, sizeof(m));
 516
 517         if (status) {
 518                 LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
 519                         __func__, status);
 520
 521                 ret = -1;
 522                 goto unlock;
 523         }
 524
 525         /* We are expecting a reply from the videocore */
 526         wait_for_completion(&instance->msg_avail_comp);
 527
 528         if (instance->result) {
 529                 LOG_ERR("%s: result=%d\n", __func__, instance->result);
 530
 531                 ret = -1;
 532                 goto unlock;
 533         }
 534
 535         ret = 0;
 536
 537 unlock:
 538         vchi_service_release(instance->vchi_handle[0]);
 539         mutex_unlock(&instance->vchi_mutex);
 540
 541         return ret;
 542 }
 543
 544 int bcm2835_audio_set_ctls(struct bcm2835_chip *chip)
 545 {
 546         int i;
 547         int ret = 0;
 548
 549         LOG_DBG(" Setting ALSA dest(%d), volume(%d)\n", chip->dest, chip->volume);
 550
 551         /* change ctls for all substreams */
 552         for (i = 0; i < MAX_SUBSTREAMS; i++) {
 553                 if (chip->avail_substreams & (1 << i)) {
 554                         if (!chip->alsa_stream[i]) {
 555                                 LOG_DBG(" No ALSA stream available?! %i:%p (%x)\n", i, chip->alsa_stream[i], chip->avail_substreams);
 556                                 ret = 0;
 557                         } else if (bcm2835_audio_set_ctls_chan(chip->alsa_stream[i], chip) != 0) {
 558                                 LOG_ERR("Couldn't set the controls for stream %d\n", i);
 559                                 ret = -1;
 560                         } else {
 561                                 LOG_DBG(" Controls set for stream %d\n", i);
 562                         }
 563                 }
 564         }
 565         return ret;
 566 }
 567
 568 int bcm2835_audio_set_params(struct bcm2835_alsa_stream *alsa_stream,
 569                              unsigned int channels, unsigned int samplerate,
 570                              unsigned int bps)
 571 {
 572         struct vc_audio_msg m;
 573         struct bcm2835_audio_instance *instance = alsa_stream->instance;
 574         int status;
 575         int ret;
 576
 577
 578         LOG_INFO(" Setting ALSA channels(%d), samplerate(%d), bits-per-sample(%d)\n",
 579                  channels, samplerate, bps);
 580
 581         /* resend ctls - alsa_stream may not have been open when first send */
 582         ret = bcm2835_audio_set_ctls_chan(alsa_stream, alsa_stream->chip);
 583         if (ret) {
 584                 LOG_ERR(" Alsa controls not supported\n");
 585                 return -EINVAL;
 586         }
 587
 588         if (mutex_lock_interruptible(&instance->vchi_mutex)) {
 589                 LOG_DBG("Interrupted whilst waiting for lock on (%d)\n", instance->num_connections);
 590                 return -EINTR;
 591         }
 592         vchi_service_use(instance->vchi_handle[0]);
 593
 594         instance->result = -1;
 595
 596         m.type = VC_AUDIO_MSG_TYPE_CONFIG;
 597         m.u.config.channels = channels;
 598         m.u.config.samplerate = samplerate;
 599         m.u.config.bps = bps;
 600
 601         /* Create the message available completion */
 602         init_completion(&instance->msg_avail_comp);
 603
 604         /* Send the message to the videocore */
 605         status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
 606                                         &m, sizeof(m));
 607
 608         if (status) {
 609                 LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
 610                         __func__, status);
 611
 612                 ret = -1;
 613                 goto unlock;
 614         }
 615
 616         /* We are expecting a reply from the videocore */
 617         wait_for_completion(&instance->msg_avail_comp);
 618
 619         if (instance->result) {
 620                 LOG_ERR("%s: result=%d", __func__, instance->result);
 621
 622                 ret = -1;
 623                 goto unlock;
 624         }
 625
 626         ret = 0;
 627
 628 unlock:
 629         vchi_service_release(instance->vchi_handle[0]);
 630         mutex_unlock(&instance->vchi_mutex);
 631
 632         return ret;
 633 }
 634
 635 int bcm2835_audio_setup(struct bcm2835_alsa_stream *alsa_stream)
 636 {
 637
 638
 639         return 0;
 640 }
 641
 642 static int bcm2835_audio_start_worker(struct bcm2835_alsa_stream *alsa_stream)
 643 {
 644         struct vc_audio_msg m;
 645         struct bcm2835_audio_instance *instance = alsa_stream->instance;
 646         int status;
 647         int ret;
 648
 649
 650         if (mutex_lock_interruptible(&instance->vchi_mutex)) {
 651                 LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
 652                         instance->num_connections);
 653                 return -EINTR;
 654         }
 655         vchi_service_use(instance->vchi_handle[0]);
 656
 657         m.type = VC_AUDIO_MSG_TYPE_START;
 658
 659         /* Send the message to the videocore */
 660         status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
 661                                         &m, sizeof(m));
 662
 663         if (status) {
 664                 LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
 665                         __func__, status);
 666
 667                 ret = -1;
 668                 goto unlock;
 669         }
 670
 671         ret = 0;
 672
 673 unlock:
 674         vchi_service_release(instance->vchi_handle[0]);
 675         mutex_unlock(&instance->vchi_mutex);
 676         return ret;
 677 }
 678
 679 static int bcm2835_audio_stop_worker(struct bcm2835_alsa_stream *alsa_stream)
 680 {
 681         struct vc_audio_msg m;
 682         struct bcm2835_audio_instance *instance = alsa_stream->instance;
 683         int status;
 684         int ret;
 685
 686
 687         if (mutex_lock_interruptible(&instance->vchi_mutex)) {
 688                 LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
 689                         instance->num_connections);
 690                 return -EINTR;
 691         }
 692         vchi_service_use(instance->vchi_handle[0]);
 693
 694         m.type = VC_AUDIO_MSG_TYPE_STOP;
 695         m.u.stop.draining = alsa_stream->draining;
 696
 697         /* Send the message to the videocore */
 698         status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
 699                                         &m, sizeof(m));
 700
 701         if (status) {
 702                 LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
 703                         __func__, status);
 704
 705                 ret = -1;
 706                 goto unlock;
 707         }
 708
 709         ret = 0;
 710
 711 unlock:
 712         vchi_service_release(instance->vchi_handle[0]);
 713         mutex_unlock(&instance->vchi_mutex);
 714         return ret;
 715 }
 716
 717 int bcm2835_audio_close(struct bcm2835_alsa_stream *alsa_stream)
 718 {
 719         struct vc_audio_msg m;
 720         struct bcm2835_audio_instance *instance = alsa_stream->instance;
 721         int status;
 722         int ret;
 723
 724
 725         my_workqueue_quit(alsa_stream);
 726
 727         if (mutex_lock_interruptible(&instance->vchi_mutex)) {
 728                 LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
 729                         instance->num_connections);
 730                 return -EINTR;
 731         }
 732         vchi_service_use(instance->vchi_handle[0]);
 733
 734         m.type = VC_AUDIO_MSG_TYPE_CLOSE;
 735
 736         /* Create the message available completion */
 737         init_completion(&instance->msg_avail_comp);
 738
 739         /* Send the message to the videocore */
 740         status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
 741                                         &m, sizeof(m));
 742
 743         if (status) {
 744                 LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
 745                         __func__, status);
 746                 ret = -1;
 747                 goto unlock;
 748         }
 749
 750         /* We are expecting a reply from the videocore */
 751         wait_for_completion(&instance->msg_avail_comp);
 752
 753         if (instance->result) {
 754                 LOG_ERR("%s: failed result (result=%d)\n",
 755                         __func__, instance->result);
 756
 757                 ret = -1;
 758                 goto unlock;
 759         }
 760
 761         ret = 0;
 762
 763 unlock:
 764         vchi_service_release(instance->vchi_handle[0]);
 765         mutex_unlock(&instance->vchi_mutex);
 766
 767         /* Stop the audio service */
 768         vc_vchi_audio_deinit(instance);
 769         alsa_stream->instance = NULL;
 770
 771         return ret;
 772 }
 773
 774 static int bcm2835_audio_write_worker(struct bcm2835_alsa_stream *alsa_stream,
 775                                       unsigned int count, void *src)
 776 {
 777         struct vc_audio_msg m;
 778         struct bcm2835_audio_instance *instance = alsa_stream->instance;
 779         int status;
 780         int ret;
 781
 782
 783         LOG_INFO(" Writing %d bytes from %p\n", count, src);
 784
 785         if (mutex_lock_interruptible(&instance->vchi_mutex)) {
 786                 LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
 787                         instance->num_connections);
 788                 return -EINTR;
 789         }
 790         vchi_service_use(instance->vchi_handle[0]);
 791
 792         if (instance->peer_version == 0 &&
 793             vchi_get_peer_version(instance->vchi_handle[0], &instance->peer_version) == 0)
 794                 LOG_DBG("%s: client version %d connected\n", __func__, instance->peer_version);
 795
 796         m.type = VC_AUDIO_MSG_TYPE_WRITE;
 797         m.u.write.count = count;
 798         // old version uses bulk, new version uses control
 799         m.u.write.max_packet = instance->peer_version < 2 || force_bulk ? 0 : 4000;
 800         m.u.write.cookie1 = BCM2835_AUDIO_WRITE_COOKIE1;
 801         m.u.write.cookie2 = BCM2835_AUDIO_WRITE_COOKIE2;
 802         m.u.write.silence = src == NULL;
 803
 804         /* Send the message to the videocore */
 805         status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
 806                                         &m, sizeof(m));
 807
 808         if (status) {
 809                 LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
 810                         __func__, status);
 811
 812                 ret = -1;
 813                 goto unlock;
 814         }
 815         if (!m.u.write.silence) {
 816                 if (!m.u.write.max_packet) {
 817                         /* Send the message to the videocore */
 818                         status = vchi_bulk_queue_transmit(instance->vchi_handle[0],
 819                                                           src, count,
 820                                                           0 * VCHI_FLAGS_BLOCK_UNTIL_QUEUED
 821                                                           +
 822                                                           1 * VCHI_FLAGS_BLOCK_UNTIL_DATA_READ,
 823                                                           NULL);
 824                 } else {
 825                         while (count > 0) {
 826                                 int bytes = min_t(int, m.u.write.max_packet, count);
 827
 828                                 status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
 829                                                                 src, bytes);
 830                                 src = (char *)src + bytes;
 831                                 count -= bytes;
 832                         }
 833                 }
 834                 if (status) {
 835                         LOG_ERR("%s: failed on vchi_bulk_queue_transmit (status=%d)\n",
 836                                 __func__, status);
 837
 838                         ret = -1;
 839                         goto unlock;
 840                 }
 841         }
 842         ret = 0;
 843
 844 unlock:
 845         vchi_service_release(instance->vchi_handle[0]);
 846         mutex_unlock(&instance->vchi_mutex);
 847         return ret;
 848 }
 849
 850 /**
 851  * Returns all buffers from arm->vc
 852  */
 853 void bcm2835_audio_flush_buffers(struct bcm2835_alsa_stream *alsa_stream)
 854 {
 855 }
 856
 857 /**
 858  * Forces VC to flush(drop) its filled playback buffers and
 859  * return them the us. (VC->ARM)
 860  */
 861 void bcm2835_audio_flush_playback_buffers(struct bcm2835_alsa_stream *alsa_stream)
 862 {
 863 }
 864
 865 unsigned int bcm2835_audio_retrieve_buffers(struct bcm2835_alsa_stream *alsa_stream)
 866 {
 867         unsigned int count = atomic_read(&alsa_stream->retrieved);
 868
 869         atomic_sub(count, &alsa_stream->retrieved);
 870         return count;
 871 }
 872
 873 module_param(force_bulk, bool, 0444);
 874 MODULE_PARM_DESC(force_bulk, "Force use of vchiq bulk for audio");