Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 1 | /* |
| 2 | * sound.c - Audio Application Interface Module for Mostcore |
| 3 | * |
| 4 | * Copyright (C) 2015 Microchip Technology Germany II GmbH & Co. KG |
| 5 | * |
| 6 | * This program is distributed in the hope that it will be useful, |
| 7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 9 | * GNU General Public License for more details. |
| 10 | * |
| 11 | * This file is licensed under GPLv2. |
| 12 | */ |
| 13 | |
| 14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 15 | |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/printk.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <sound/core.h> |
| 21 | #include <sound/pcm.h> |
Christian Gromm | 8e4a0ef | 2015-09-28 17:18:47 +0200 | [diff] [blame] | 22 | #include <sound/pcm_params.h> |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 23 | #include <linux/sched.h> |
| 24 | #include <linux/kthread.h> |
| 25 | #include <mostcore.h> |
| 26 | |
| 27 | #define DRIVER_NAME "sound" |
| 28 | |
| 29 | static struct list_head dev_list; |
Christian Gromm | f13f698 | 2015-09-28 17:18:35 +0200 | [diff] [blame] | 30 | static struct most_aim audio_aim; |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 31 | |
| 32 | /** |
| 33 | * struct channel - private structure to keep channel specific data |
| 34 | * @substream: stores the substream structure |
| 35 | * @iface: interface for which the channel belongs to |
| 36 | * @cfg: channel configuration |
| 37 | * @card: registered sound card |
| 38 | * @list: list for private use |
| 39 | * @id: channel index |
| 40 | * @period_pos: current period position (ring buffer) |
| 41 | * @buffer_pos: current buffer position (ring buffer) |
| 42 | * @is_stream_running: identifies whether a stream is running or not |
| 43 | * @opened: set when the stream is opened |
| 44 | * @playback_task: playback thread |
| 45 | * @playback_waitq: waitq used by playback thread |
| 46 | */ |
| 47 | struct channel { |
| 48 | struct snd_pcm_substream *substream; |
Christian Gromm | d801887 | 2015-09-28 17:18:49 +0200 | [diff] [blame] | 49 | struct snd_pcm_hardware pcm_hardware; |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 50 | struct most_interface *iface; |
| 51 | struct most_channel_config *cfg; |
| 52 | struct snd_card *card; |
| 53 | struct list_head list; |
| 54 | int id; |
| 55 | unsigned int period_pos; |
| 56 | unsigned int buffer_pos; |
| 57 | bool is_stream_running; |
| 58 | |
| 59 | struct task_struct *playback_task; |
| 60 | wait_queue_head_t playback_waitq; |
| 61 | |
| 62 | void (*copy_fn)(void *alsa, void *most, unsigned int bytes); |
| 63 | }; |
| 64 | |
| 65 | #define MOST_PCM_INFO (SNDRV_PCM_INFO_MMAP | \ |
| 66 | SNDRV_PCM_INFO_MMAP_VALID | \ |
| 67 | SNDRV_PCM_INFO_BATCH | \ |
| 68 | SNDRV_PCM_INFO_INTERLEAVED | \ |
| 69 | SNDRV_PCM_INFO_BLOCK_TRANSFER) |
| 70 | |
| 71 | /** |
| 72 | * Initialization of struct snd_pcm_hardware |
| 73 | */ |
Christian Gromm | d801887 | 2015-09-28 17:18:49 +0200 | [diff] [blame] | 74 | static void init_pcm_hardware(struct snd_pcm_hardware *pcm_hw) |
| 75 | { |
| 76 | pcm_hw->info = MOST_PCM_INFO; |
| 77 | pcm_hw->rates = SNDRV_PCM_RATE_48000; |
| 78 | pcm_hw->rate_min = 48000; |
| 79 | pcm_hw->rate_max = 48000; |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 80 | }; |
| 81 | |
| 82 | #define swap16(val) ( \ |
| 83 | (((u16)(val) << 8) & (u16)0xFF00) | \ |
| 84 | (((u16)(val) >> 8) & (u16)0x00FF)) |
| 85 | |
| 86 | #define swap32(val) ( \ |
| 87 | (((u32)(val) << 24) & (u32)0xFF000000) | \ |
| 88 | (((u32)(val) << 8) & (u32)0x00FF0000) | \ |
| 89 | (((u32)(val) >> 8) & (u32)0x0000FF00) | \ |
| 90 | (((u32)(val) >> 24) & (u32)0x000000FF)) |
| 91 | |
| 92 | static void swap_copy16(u16 *dest, const u16 *source, unsigned int bytes) |
| 93 | { |
| 94 | unsigned int i = 0; |
| 95 | |
| 96 | while (i < (bytes / 2)) { |
| 97 | dest[i] = swap16(source[i]); |
| 98 | i++; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | static void swap_copy24(u8 *dest, const u8 *source, unsigned int bytes) |
| 103 | { |
| 104 | unsigned int i = 0; |
| 105 | |
| 106 | while (i < bytes - 2) { |
| 107 | dest[i] = source[i + 2]; |
| 108 | dest[i + 1] = source[i + 1]; |
| 109 | dest[i + 2] = source[i]; |
| 110 | i += 3; |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | static void swap_copy32(u32 *dest, const u32 *source, unsigned int bytes) |
| 115 | { |
| 116 | unsigned int i = 0; |
| 117 | |
| 118 | while (i < bytes / 4) { |
| 119 | dest[i] = swap32(source[i]); |
| 120 | i++; |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | static void alsa_to_most_memcpy(void *alsa, void *most, unsigned int bytes) |
| 125 | { |
| 126 | memcpy(most, alsa, bytes); |
| 127 | } |
| 128 | |
| 129 | static void alsa_to_most_copy16(void *alsa, void *most, unsigned int bytes) |
| 130 | { |
| 131 | swap_copy16(most, alsa, bytes); |
| 132 | } |
| 133 | |
| 134 | static void alsa_to_most_copy24(void *alsa, void *most, unsigned int bytes) |
| 135 | { |
| 136 | swap_copy24(most, alsa, bytes); |
| 137 | } |
| 138 | |
| 139 | static void alsa_to_most_copy32(void *alsa, void *most, unsigned int bytes) |
| 140 | { |
| 141 | swap_copy32(most, alsa, bytes); |
| 142 | } |
| 143 | |
| 144 | static void most_to_alsa_memcpy(void *alsa, void *most, unsigned int bytes) |
| 145 | { |
| 146 | memcpy(alsa, most, bytes); |
| 147 | } |
| 148 | |
| 149 | static void most_to_alsa_copy16(void *alsa, void *most, unsigned int bytes) |
| 150 | { |
| 151 | swap_copy16(alsa, most, bytes); |
| 152 | } |
| 153 | |
| 154 | static void most_to_alsa_copy24(void *alsa, void *most, unsigned int bytes) |
| 155 | { |
| 156 | swap_copy24(alsa, most, bytes); |
| 157 | } |
| 158 | |
| 159 | static void most_to_alsa_copy32(void *alsa, void *most, unsigned int bytes) |
| 160 | { |
| 161 | swap_copy32(alsa, most, bytes); |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * get_channel - get pointer to channel |
| 166 | * @iface: interface structure |
| 167 | * @channel_id: channel ID |
| 168 | * |
| 169 | * This traverses the channel list and returns the channel matching the |
| 170 | * ID and interface. |
| 171 | * |
| 172 | * Returns pointer to channel on success or NULL otherwise. |
| 173 | */ |
| 174 | static struct channel *get_channel(struct most_interface *iface, |
| 175 | int channel_id) |
| 176 | { |
| 177 | struct channel *channel, *tmp; |
| 178 | |
| 179 | list_for_each_entry_safe(channel, tmp, &dev_list, list) { |
| 180 | if ((channel->iface == iface) && (channel->id == channel_id)) |
| 181 | return channel; |
| 182 | } |
| 183 | |
| 184 | return NULL; |
| 185 | } |
| 186 | |
| 187 | /** |
| 188 | * copy_data - implements data copying function |
| 189 | * @channel: channel |
| 190 | * @mbo: MBO from core |
| 191 | * |
| 192 | * Copy data from/to ring buffer to/from MBO and update the buffer position |
| 193 | */ |
| 194 | static bool copy_data(struct channel *channel, struct mbo *mbo) |
| 195 | { |
| 196 | struct snd_pcm_runtime *const runtime = channel->substream->runtime; |
| 197 | unsigned int const frame_bytes = channel->cfg->subbuffer_size; |
| 198 | unsigned int const buffer_size = runtime->buffer_size; |
| 199 | unsigned int frames; |
| 200 | unsigned int fr0; |
| 201 | |
| 202 | if (channel->cfg->direction & MOST_CH_RX) |
| 203 | frames = mbo->processed_length / frame_bytes; |
| 204 | else |
| 205 | frames = mbo->buffer_length / frame_bytes; |
| 206 | fr0 = min(buffer_size - channel->buffer_pos, frames); |
| 207 | |
| 208 | channel->copy_fn(runtime->dma_area + channel->buffer_pos * frame_bytes, |
| 209 | mbo->virt_address, |
| 210 | fr0 * frame_bytes); |
| 211 | |
| 212 | if (frames > fr0) { |
| 213 | /* wrap around at end of ring buffer */ |
| 214 | channel->copy_fn(runtime->dma_area, |
| 215 | mbo->virt_address + fr0 * frame_bytes, |
| 216 | (frames - fr0) * frame_bytes); |
| 217 | } |
| 218 | |
| 219 | channel->buffer_pos += frames; |
| 220 | if (channel->buffer_pos >= buffer_size) |
| 221 | channel->buffer_pos -= buffer_size; |
| 222 | channel->period_pos += frames; |
| 223 | if (channel->period_pos >= runtime->period_size) { |
| 224 | channel->period_pos -= runtime->period_size; |
| 225 | return true; |
| 226 | } |
| 227 | |
| 228 | return false; |
| 229 | } |
| 230 | |
| 231 | /** |
| 232 | * playback_thread - function implements the playback thread |
| 233 | * @data: private data |
| 234 | * |
| 235 | * Thread which does the playback functionality in a loop. It waits for a free |
| 236 | * MBO from mostcore for a particular channel and copy the data from ring buffer |
| 237 | * to MBO. Submit the MBO back to mostcore, after copying the data. |
| 238 | * |
| 239 | * Returns 0 on success or error code otherwise. |
| 240 | */ |
| 241 | static int playback_thread(void *data) |
| 242 | { |
| 243 | struct channel *const channel = data; |
| 244 | |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 245 | while (!kthread_should_stop()) { |
| 246 | struct mbo *mbo = NULL; |
| 247 | bool period_elapsed = false; |
| 248 | int ret; |
| 249 | |
| 250 | wait_event_interruptible( |
| 251 | channel->playback_waitq, |
| 252 | kthread_should_stop() || |
Christian Gromm | 71457d4 | 2015-09-28 17:18:45 +0200 | [diff] [blame] | 253 | (mbo = most_get_mbo(channel->iface, channel->id, |
| 254 | &audio_aim))); |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 255 | |
| 256 | if (!mbo) |
| 257 | continue; |
| 258 | |
| 259 | if (channel->is_stream_running) |
| 260 | period_elapsed = copy_data(channel, mbo); |
| 261 | else |
| 262 | memset(mbo->virt_address, 0, mbo->buffer_length); |
| 263 | |
| 264 | ret = most_submit_mbo(mbo); |
| 265 | if (ret) |
| 266 | channel->is_stream_running = false; |
| 267 | |
| 268 | if (period_elapsed) |
| 269 | snd_pcm_period_elapsed(channel->substream); |
| 270 | } |
| 271 | |
| 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | /** |
| 276 | * pcm_open - implements open callback function for PCM middle layer |
| 277 | * @substream: pointer to ALSA PCM substream |
| 278 | * |
| 279 | * This is called when a PCM substream is opened. At least, the function should |
| 280 | * initialize the runtime->hw record. |
| 281 | * |
| 282 | * Returns 0 on success or error code otherwise. |
| 283 | */ |
| 284 | static int pcm_open(struct snd_pcm_substream *substream) |
| 285 | { |
| 286 | struct channel *channel = substream->private_data; |
| 287 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 288 | struct most_channel_config *cfg = channel->cfg; |
| 289 | |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 290 | channel->substream = substream; |
| 291 | |
| 292 | if (cfg->direction == MOST_CH_TX) { |
| 293 | init_waitqueue_head(&channel->playback_waitq); |
| 294 | channel->playback_task = kthread_run(&playback_thread, channel, |
| 295 | "most_audio_playback"); |
| 296 | if (IS_ERR(channel->playback_task)) |
| 297 | return PTR_ERR(channel->playback_task); |
| 298 | } |
| 299 | |
Christian Gromm | f13f698 | 2015-09-28 17:18:35 +0200 | [diff] [blame] | 300 | if (most_start_channel(channel->iface, channel->id, &audio_aim)) { |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 301 | pr_err("most_start_channel() failed!\n"); |
| 302 | if (cfg->direction == MOST_CH_TX) |
| 303 | kthread_stop(channel->playback_task); |
| 304 | return -EBUSY; |
| 305 | } |
| 306 | |
Christian Gromm | d801887 | 2015-09-28 17:18:49 +0200 | [diff] [blame] | 307 | runtime->hw = channel->pcm_hardware; |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 308 | runtime->hw.buffer_bytes_max = cfg->num_buffers * cfg->buffer_size; |
| 309 | runtime->hw.period_bytes_min = cfg->buffer_size; |
| 310 | runtime->hw.period_bytes_max = cfg->buffer_size; |
| 311 | runtime->hw.periods_min = 1; |
| 312 | runtime->hw.periods_max = cfg->num_buffers; |
| 313 | |
| 314 | return 0; |
| 315 | } |
| 316 | |
| 317 | /** |
| 318 | * pcm_close - implements close callback function for PCM middle layer |
| 319 | * @substream: sub-stream pointer |
| 320 | * |
| 321 | * Obviously, this is called when a PCM substream is closed. Any private |
| 322 | * instance for a PCM substream allocated in the open callback will be |
| 323 | * released here. |
| 324 | * |
| 325 | * Returns 0 on success or error code otherwise. |
| 326 | */ |
| 327 | static int pcm_close(struct snd_pcm_substream *substream) |
| 328 | { |
| 329 | struct channel *channel = substream->private_data; |
| 330 | |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 331 | if (channel->cfg->direction == MOST_CH_TX) |
| 332 | kthread_stop(channel->playback_task); |
Christian Gromm | f13f698 | 2015-09-28 17:18:35 +0200 | [diff] [blame] | 333 | most_stop_channel(channel->iface, channel->id, &audio_aim); |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 334 | |
| 335 | return 0; |
| 336 | } |
| 337 | |
| 338 | /** |
| 339 | * pcm_hw_params - implements hw_params callback function for PCM middle layer |
| 340 | * @substream: sub-stream pointer |
| 341 | * @hw_params: contains the hardware parameters set by the application |
| 342 | * |
| 343 | * This is called when the hardware parameters is set by the application, that |
| 344 | * is, once when the buffer size, the period size, the format, etc. are defined |
| 345 | * for the PCM substream. Many hardware setups should be done is this callback, |
| 346 | * including the allocation of buffers. |
| 347 | * |
| 348 | * Returns 0 on success or error code otherwise. |
| 349 | */ |
| 350 | static int pcm_hw_params(struct snd_pcm_substream *substream, |
| 351 | struct snd_pcm_hw_params *hw_params) |
| 352 | { |
Christian Gromm | d801887 | 2015-09-28 17:18:49 +0200 | [diff] [blame] | 353 | struct channel *channel = substream->private_data; |
Christian Gromm | 8e4a0ef | 2015-09-28 17:18:47 +0200 | [diff] [blame] | 354 | |
Christian Gromm | d801887 | 2015-09-28 17:18:49 +0200 | [diff] [blame] | 355 | if ((params_channels(hw_params) > channel->pcm_hardware.channels_max) || |
| 356 | (params_channels(hw_params) < channel->pcm_hardware.channels_min) || |
| 357 | !(params_format(hw_params) != channel->pcm_hardware.formats)) |
Christian Gromm | 8e4a0ef | 2015-09-28 17:18:47 +0200 | [diff] [blame] | 358 | return -EINVAL; |
Christian Gromm | b981abb | 2015-09-28 17:18:51 +0200 | [diff] [blame] | 359 | return snd_pcm_lib_alloc_vmalloc_buffer(substream, |
Christian Gromm | d801887 | 2015-09-28 17:18:49 +0200 | [diff] [blame] | 360 | params_buffer_bytes(hw_params)); |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 361 | } |
| 362 | |
| 363 | /** |
| 364 | * pcm_hw_free - implements hw_free callback function for PCM middle layer |
| 365 | * @substream: substream pointer |
| 366 | * |
| 367 | * This is called to release the resources allocated via hw_params. |
| 368 | * This function will be always called before the close callback is called. |
| 369 | * |
| 370 | * Returns 0 on success or error code otherwise. |
| 371 | */ |
| 372 | static int pcm_hw_free(struct snd_pcm_substream *substream) |
| 373 | { |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 374 | return snd_pcm_lib_free_vmalloc_buffer(substream); |
| 375 | } |
| 376 | |
| 377 | /** |
| 378 | * pcm_prepare - implements prepare callback function for PCM middle layer |
| 379 | * @substream: substream pointer |
| 380 | * |
| 381 | * This callback is called when the PCM is "prepared". Format rate, sample rate, |
| 382 | * etc., can be set here. This callback can be called many times at each setup. |
| 383 | * |
| 384 | * Returns 0 on success or error code otherwise. |
| 385 | */ |
| 386 | static int pcm_prepare(struct snd_pcm_substream *substream) |
| 387 | { |
| 388 | struct channel *channel = substream->private_data; |
| 389 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 390 | struct most_channel_config *cfg = channel->cfg; |
| 391 | int width = snd_pcm_format_physical_width(runtime->format); |
| 392 | |
| 393 | channel->copy_fn = NULL; |
| 394 | |
| 395 | if (cfg->direction == MOST_CH_TX) { |
| 396 | if (snd_pcm_format_big_endian(runtime->format) || width == 8) |
| 397 | channel->copy_fn = alsa_to_most_memcpy; |
| 398 | else if (width == 16) |
| 399 | channel->copy_fn = alsa_to_most_copy16; |
| 400 | else if (width == 24) |
| 401 | channel->copy_fn = alsa_to_most_copy24; |
| 402 | else if (width == 32) |
| 403 | channel->copy_fn = alsa_to_most_copy32; |
| 404 | } else { |
| 405 | if (snd_pcm_format_big_endian(runtime->format) || width == 8) |
| 406 | channel->copy_fn = most_to_alsa_memcpy; |
| 407 | else if (width == 16) |
| 408 | channel->copy_fn = most_to_alsa_copy16; |
| 409 | else if (width == 24) |
| 410 | channel->copy_fn = most_to_alsa_copy24; |
| 411 | else if (width == 32) |
| 412 | channel->copy_fn = most_to_alsa_copy32; |
| 413 | } |
| 414 | |
| 415 | if (!channel->copy_fn) { |
| 416 | pr_err("unsupported format\n"); |
| 417 | return -EINVAL; |
| 418 | } |
| 419 | |
| 420 | channel->period_pos = 0; |
| 421 | channel->buffer_pos = 0; |
| 422 | |
| 423 | return 0; |
| 424 | } |
| 425 | |
| 426 | /** |
| 427 | * pcm_trigger - implements trigger callback function for PCM middle layer |
| 428 | * @substream: substream pointer |
| 429 | * @cmd: action to perform |
| 430 | * |
| 431 | * This is called when the PCM is started, stopped or paused. The action will be |
| 432 | * specified in the second argument, SNDRV_PCM_TRIGGER_XXX |
| 433 | * |
| 434 | * Returns 0 on success or error code otherwise. |
| 435 | */ |
| 436 | static int pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
| 437 | { |
| 438 | struct channel *channel = substream->private_data; |
| 439 | |
| 440 | switch (cmd) { |
| 441 | case SNDRV_PCM_TRIGGER_START: |
| 442 | channel->is_stream_running = true; |
| 443 | return 0; |
| 444 | |
| 445 | case SNDRV_PCM_TRIGGER_STOP: |
| 446 | channel->is_stream_running = false; |
| 447 | return 0; |
| 448 | |
| 449 | default: |
| 450 | pr_info("pcm_trigger(), invalid\n"); |
| 451 | return -EINVAL; |
| 452 | } |
| 453 | return 0; |
| 454 | } |
| 455 | |
| 456 | /** |
| 457 | * pcm_pointer - implements pointer callback function for PCM middle layer |
| 458 | * @substream: substream pointer |
| 459 | * |
| 460 | * This callback is called when the PCM middle layer inquires the current |
| 461 | * hardware position on the buffer. The position must be returned in frames, |
| 462 | * ranging from 0 to buffer_size-1. |
| 463 | */ |
| 464 | static snd_pcm_uframes_t pcm_pointer(struct snd_pcm_substream *substream) |
| 465 | { |
| 466 | struct channel *channel = substream->private_data; |
| 467 | |
| 468 | return channel->buffer_pos; |
| 469 | } |
| 470 | |
| 471 | /** |
| 472 | * Initialization of struct snd_pcm_ops |
| 473 | */ |
| 474 | static struct snd_pcm_ops pcm_ops = { |
| 475 | .open = pcm_open, |
| 476 | .close = pcm_close, |
| 477 | .ioctl = snd_pcm_lib_ioctl, |
| 478 | .hw_params = pcm_hw_params, |
| 479 | .hw_free = pcm_hw_free, |
| 480 | .prepare = pcm_prepare, |
| 481 | .trigger = pcm_trigger, |
| 482 | .pointer = pcm_pointer, |
| 483 | .page = snd_pcm_lib_get_vmalloc_page, |
| 484 | .mmap = snd_pcm_lib_mmap_vmalloc, |
| 485 | }; |
| 486 | |
| 487 | |
Sudip Mukherjee | 809da8a | 2015-08-18 20:48:25 +0530 | [diff] [blame] | 488 | static int split_arg_list(char *buf, char **card_name, char **pcm_format) |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 489 | { |
| 490 | *card_name = strsep(&buf, "."); |
| 491 | if (!*card_name) |
| 492 | return -EIO; |
| 493 | *pcm_format = strsep(&buf, ".\n"); |
| 494 | if (!*pcm_format) |
| 495 | return -EIO; |
| 496 | return 0; |
| 497 | } |
| 498 | |
Christian Gromm | d801887 | 2015-09-28 17:18:49 +0200 | [diff] [blame] | 499 | static int audio_set_pcm_format(struct snd_pcm_hardware *pcm_hw, |
| 500 | char *pcm_format, |
Sudip Mukherjee | 809da8a | 2015-08-18 20:48:25 +0530 | [diff] [blame] | 501 | struct most_channel_config *cfg) |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 502 | { |
| 503 | if (!strcmp(pcm_format, "1x8")) { |
| 504 | if (cfg->subbuffer_size != 1) |
| 505 | goto error; |
| 506 | pr_info("PCM format is 8-bit mono\n"); |
Christian Gromm | 31e91e0 | 2015-09-28 17:18:52 +0200 | [diff] [blame^] | 507 | pcm_hw->channels_min = 1; |
| 508 | pcm_hw->channels_max = 1; |
Christian Gromm | d801887 | 2015-09-28 17:18:49 +0200 | [diff] [blame] | 509 | pcm_hw->formats = SNDRV_PCM_FMTBIT_S8; |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 510 | } else if (!strcmp(pcm_format, "2x16")) { |
| 511 | if (cfg->subbuffer_size != 4) |
| 512 | goto error; |
| 513 | pr_info("PCM format is 16-bit stereo\n"); |
Christian Gromm | d801887 | 2015-09-28 17:18:49 +0200 | [diff] [blame] | 514 | pcm_hw->channels_min = 2; |
| 515 | pcm_hw->channels_max = 2; |
| 516 | pcm_hw->formats = SNDRV_PCM_FMTBIT_S16_LE | |
| 517 | SNDRV_PCM_FMTBIT_S16_BE; |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 518 | } else if (!strcmp(pcm_format, "2x24")) { |
| 519 | if (cfg->subbuffer_size != 6) |
| 520 | goto error; |
| 521 | pr_info("PCM format is 24-bit stereo\n"); |
Christian Gromm | d801887 | 2015-09-28 17:18:49 +0200 | [diff] [blame] | 522 | pcm_hw->channels_min = 2; |
| 523 | pcm_hw->channels_max = 2; |
| 524 | pcm_hw->formats = SNDRV_PCM_FMTBIT_S24_3LE | |
| 525 | SNDRV_PCM_FMTBIT_S24_3BE; |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 526 | } else if (!strcmp(pcm_format, "2x32")) { |
| 527 | if (cfg->subbuffer_size != 8) |
| 528 | goto error; |
| 529 | pr_info("PCM format is 32-bit stereo\n"); |
Christian Gromm | d801887 | 2015-09-28 17:18:49 +0200 | [diff] [blame] | 530 | pcm_hw->channels_min = 2; |
| 531 | pcm_hw->channels_max = 2; |
| 532 | pcm_hw->formats = SNDRV_PCM_FMTBIT_S32_LE | |
| 533 | SNDRV_PCM_FMTBIT_S32_BE; |
Christian Gromm | 8e4a0ef | 2015-09-28 17:18:47 +0200 | [diff] [blame] | 534 | } else if (!strcmp(pcm_format, "6x16")) { |
| 535 | if (cfg->subbuffer_size != 12) |
| 536 | goto error; |
| 537 | pr_info("PCM format is 16-bit 5.1 multi channel\n"); |
Christian Gromm | d801887 | 2015-09-28 17:18:49 +0200 | [diff] [blame] | 538 | pcm_hw->channels_min = 6; |
| 539 | pcm_hw->channels_max = 6; |
| 540 | pcm_hw->formats = SNDRV_PCM_FMTBIT_S16_LE | |
| 541 | SNDRV_PCM_FMTBIT_S16_BE; |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 542 | } else { |
| 543 | pr_err("PCM format %s not supported\n", pcm_format); |
| 544 | return -EIO; |
| 545 | } |
| 546 | return 0; |
| 547 | error: |
| 548 | pr_err("Audio resolution doesn't fit subbuffer size\n"); |
| 549 | return -EINVAL; |
| 550 | } |
| 551 | |
| 552 | /** |
| 553 | * audio_probe_channel - probe function of the driver module |
| 554 | * @iface: pointer to interface instance |
| 555 | * @channel_id: channel index/ID |
| 556 | * @cfg: pointer to actual channel configuration |
| 557 | * @parent: pointer to kobject (needed for sysfs hook-up) |
| 558 | * @arg_list: string that provides the name of the device to be created in /dev |
| 559 | * plus the desired audio resolution |
| 560 | * |
| 561 | * Creates sound card, pcm device, sets pcm ops and registers sound card. |
| 562 | * |
| 563 | * Returns 0 on success or error code otherwise. |
| 564 | */ |
| 565 | static int audio_probe_channel(struct most_interface *iface, int channel_id, |
| 566 | struct most_channel_config *cfg, |
| 567 | struct kobject *parent, char *arg_list) |
| 568 | { |
| 569 | struct channel *channel; |
| 570 | struct snd_card *card; |
| 571 | struct snd_pcm *pcm; |
| 572 | int playback_count = 0; |
| 573 | int capture_count = 0; |
| 574 | int ret; |
| 575 | int direction; |
| 576 | char *card_name; |
| 577 | char *pcm_format; |
| 578 | |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 579 | if (!iface) |
| 580 | return -EINVAL; |
| 581 | |
| 582 | if (cfg->data_type != MOST_CH_SYNC) { |
| 583 | pr_err("Incompatible channel type\n"); |
| 584 | return -EINVAL; |
| 585 | } |
| 586 | |
| 587 | if (get_channel(iface, channel_id)) { |
| 588 | pr_err("channel (%s:%d) is already linked\n", |
| 589 | iface->description, channel_id); |
| 590 | return -EINVAL; |
| 591 | } |
| 592 | |
| 593 | if (cfg->direction == MOST_CH_TX) { |
| 594 | playback_count = 1; |
| 595 | direction = SNDRV_PCM_STREAM_PLAYBACK; |
| 596 | } else { |
| 597 | capture_count = 1; |
| 598 | direction = SNDRV_PCM_STREAM_CAPTURE; |
| 599 | } |
| 600 | |
| 601 | ret = split_arg_list(arg_list, &card_name, &pcm_format); |
| 602 | if (ret < 0) { |
| 603 | pr_info("PCM format missing\n"); |
| 604 | return ret; |
| 605 | } |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 606 | |
| 607 | ret = snd_card_new(NULL, -1, card_name, THIS_MODULE, |
| 608 | sizeof(*channel), &card); |
| 609 | if (ret < 0) |
| 610 | return ret; |
| 611 | |
| 612 | channel = card->private_data; |
| 613 | channel->card = card; |
| 614 | channel->cfg = cfg; |
| 615 | channel->iface = iface; |
| 616 | channel->id = channel_id; |
Christian Gromm | d801887 | 2015-09-28 17:18:49 +0200 | [diff] [blame] | 617 | init_pcm_hardware(&channel->pcm_hardware); |
| 618 | |
| 619 | if (audio_set_pcm_format(&channel->pcm_hardware, pcm_format, cfg)) |
| 620 | goto err_free_card; |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 621 | |
| 622 | snprintf(card->driver, sizeof(card->driver), "%s", DRIVER_NAME); |
Christian Gromm | 9801345 | 2015-09-28 17:18:48 +0200 | [diff] [blame] | 623 | snprintf(card->shortname, sizeof(card->shortname), "Microchip MOST:%d", |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 624 | card->number); |
| 625 | snprintf(card->longname, sizeof(card->longname), "%s at %s, ch %d", |
| 626 | card->shortname, iface->description, channel_id); |
| 627 | |
| 628 | ret = snd_pcm_new(card, card_name, 0, playback_count, |
| 629 | capture_count, &pcm); |
| 630 | if (ret < 0) |
| 631 | goto err_free_card; |
| 632 | |
| 633 | pcm->private_data = channel; |
| 634 | |
| 635 | snd_pcm_set_ops(pcm, direction, &pcm_ops); |
| 636 | |
| 637 | ret = snd_card_register(card); |
| 638 | if (ret < 0) |
| 639 | goto err_free_card; |
| 640 | |
| 641 | list_add_tail(&channel->list, &dev_list); |
| 642 | |
| 643 | return 0; |
| 644 | |
| 645 | err_free_card: |
| 646 | snd_card_free(card); |
| 647 | return ret; |
| 648 | } |
| 649 | |
| 650 | /** |
| 651 | * audio_disconnect_channel - function to disconnect a channel |
| 652 | * @iface: pointer to interface instance |
| 653 | * @channel_id: channel index |
| 654 | * |
| 655 | * This frees allocated memory and removes the sound card from ALSA |
| 656 | * |
| 657 | * Returns 0 on success or error code otherwise. |
| 658 | */ |
| 659 | static int audio_disconnect_channel(struct most_interface *iface, |
| 660 | int channel_id) |
| 661 | { |
| 662 | struct channel *channel; |
| 663 | |
Christian Gromm | 54b4856 | 2015-07-24 16:11:51 +0200 | [diff] [blame] | 664 | channel = get_channel(iface, channel_id); |
| 665 | if (!channel) { |
| 666 | pr_err("sound_disconnect_channel(), invalid channel %d\n", |
| 667 | channel_id); |
| 668 | return -EINVAL; |
| 669 | } |
| 670 | |
| 671 | list_del(&channel->list); |
| 672 | snd_card_free(channel->card); |
| 673 | |
| 674 | return 0; |
| 675 | } |
| 676 | |
| 677 | /** |
| 678 | * audio_rx_completion - completion handler for rx channels |
| 679 | * @mbo: pointer to buffer object that has completed |
| 680 | * |
| 681 | * This searches for the channel this MBO belongs to and copy the data from MBO |
| 682 | * to ring buffer |
| 683 | * |
| 684 | * Returns 0 on success or error code otherwise. |
| 685 | */ |
| 686 | static int audio_rx_completion(struct mbo *mbo) |
| 687 | { |
| 688 | struct channel *channel = get_channel(mbo->ifp, mbo->hdm_channel_id); |
| 689 | bool period_elapsed = false; |
| 690 | |
| 691 | if (!channel) { |
| 692 | pr_err("sound_rx_completion(), invalid channel %d\n", |
| 693 | mbo->hdm_channel_id); |
| 694 | return -EINVAL; |
| 695 | } |
| 696 | |
| 697 | if (channel->is_stream_running) |
| 698 | period_elapsed = copy_data(channel, mbo); |
| 699 | |
| 700 | most_put_mbo(mbo); |
| 701 | |
| 702 | if (period_elapsed) |
| 703 | snd_pcm_period_elapsed(channel->substream); |
| 704 | |
| 705 | return 0; |
| 706 | } |
| 707 | |
| 708 | /** |
| 709 | * audio_tx_completion - completion handler for tx channels |
| 710 | * @iface: pointer to interface instance |
| 711 | * @channel_id: channel index/ID |
| 712 | * |
| 713 | * This searches the channel that belongs to this combination of interface |
| 714 | * pointer and channel ID and wakes a process sitting in the wait queue of |
| 715 | * this channel. |
| 716 | * |
| 717 | * Returns 0 on success or error code otherwise. |
| 718 | */ |
| 719 | static int audio_tx_completion(struct most_interface *iface, int channel_id) |
| 720 | { |
| 721 | struct channel *channel = get_channel(iface, channel_id); |
| 722 | |
| 723 | if (!channel) { |
| 724 | pr_err("sound_tx_completion(), invalid channel %d\n", |
| 725 | channel_id); |
| 726 | return -EINVAL; |
| 727 | } |
| 728 | |
| 729 | wake_up_interruptible(&channel->playback_waitq); |
| 730 | |
| 731 | return 0; |
| 732 | } |
| 733 | |
| 734 | /** |
| 735 | * Initialization of the struct most_aim |
| 736 | */ |
| 737 | static struct most_aim audio_aim = { |
| 738 | .name = DRIVER_NAME, |
| 739 | .probe_channel = audio_probe_channel, |
| 740 | .disconnect_channel = audio_disconnect_channel, |
| 741 | .rx_completion = audio_rx_completion, |
| 742 | .tx_completion = audio_tx_completion, |
| 743 | }; |
| 744 | |
| 745 | static int __init audio_init(void) |
| 746 | { |
| 747 | pr_info("init()\n"); |
| 748 | |
| 749 | INIT_LIST_HEAD(&dev_list); |
| 750 | |
| 751 | return most_register_aim(&audio_aim); |
| 752 | } |
| 753 | |
| 754 | static void __exit audio_exit(void) |
| 755 | { |
| 756 | struct channel *channel, *tmp; |
| 757 | |
| 758 | pr_info("exit()\n"); |
| 759 | |
| 760 | list_for_each_entry_safe(channel, tmp, &dev_list, list) { |
| 761 | list_del(&channel->list); |
| 762 | snd_card_free(channel->card); |
| 763 | } |
| 764 | |
| 765 | most_deregister_aim(&audio_aim); |
| 766 | } |
| 767 | |
| 768 | module_init(audio_init); |
| 769 | module_exit(audio_exit); |
| 770 | |
| 771 | MODULE_LICENSE("GPL"); |
| 772 | MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>"); |
| 773 | MODULE_DESCRIPTION("Audio Application Interface Module for MostCore"); |