Oleksandr Andrushchenko | 1cee559 | 2018-05-14 09:27:41 +0300 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 OR MIT |
| 2 | |
| 3 | /* |
| 4 | * Xen para-virtual sound device |
| 5 | * |
| 6 | * Copyright (C) 2016-2018 EPAM Systems Inc. |
| 7 | * |
| 8 | * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> |
| 9 | */ |
| 10 | |
| 11 | #include <linux/platform_device.h> |
| 12 | |
| 13 | #include <sound/core.h> |
| 14 | #include <sound/pcm.h> |
| 15 | #include <sound/pcm_params.h> |
| 16 | |
| 17 | #include <xen/xenbus.h> |
| 18 | |
| 19 | #include "xen_snd_front.h" |
| 20 | #include "xen_snd_front_alsa.h" |
| 21 | #include "xen_snd_front_cfg.h" |
| 22 | #include "xen_snd_front_evtchnl.h" |
| 23 | #include "xen_snd_front_shbuf.h" |
| 24 | |
| 25 | struct xen_snd_front_pcm_stream_info { |
| 26 | struct xen_snd_front_info *front_info; |
| 27 | struct xen_snd_front_evtchnl_pair *evt_pair; |
| 28 | struct xen_snd_front_shbuf sh_buf; |
| 29 | int index; |
| 30 | |
| 31 | bool is_open; |
| 32 | struct snd_pcm_hardware pcm_hw; |
| 33 | |
| 34 | /* Number of processed frames as reported by the backend. */ |
| 35 | snd_pcm_uframes_t be_cur_frame; |
| 36 | /* Current HW pointer to be reported via .period callback. */ |
| 37 | atomic_t hw_ptr; |
| 38 | /* Modulo of the number of processed frames - for period detection. */ |
| 39 | u32 out_frames; |
| 40 | }; |
| 41 | |
| 42 | struct xen_snd_front_pcm_instance_info { |
| 43 | struct xen_snd_front_card_info *card_info; |
| 44 | struct snd_pcm *pcm; |
| 45 | struct snd_pcm_hardware pcm_hw; |
| 46 | int num_pcm_streams_pb; |
| 47 | struct xen_snd_front_pcm_stream_info *streams_pb; |
| 48 | int num_pcm_streams_cap; |
| 49 | struct xen_snd_front_pcm_stream_info *streams_cap; |
| 50 | }; |
| 51 | |
| 52 | struct xen_snd_front_card_info { |
| 53 | struct xen_snd_front_info *front_info; |
| 54 | struct snd_card *card; |
| 55 | struct snd_pcm_hardware pcm_hw; |
| 56 | int num_pcm_instances; |
| 57 | struct xen_snd_front_pcm_instance_info *pcm_instances; |
| 58 | }; |
| 59 | |
| 60 | struct alsa_sndif_sample_format { |
| 61 | u8 sndif; |
| 62 | snd_pcm_format_t alsa; |
| 63 | }; |
| 64 | |
| 65 | struct alsa_sndif_hw_param { |
| 66 | u8 sndif; |
| 67 | snd_pcm_hw_param_t alsa; |
| 68 | }; |
| 69 | |
| 70 | static const struct alsa_sndif_sample_format ALSA_SNDIF_FORMATS[] = { |
| 71 | { |
| 72 | .sndif = XENSND_PCM_FORMAT_U8, |
| 73 | .alsa = SNDRV_PCM_FORMAT_U8 |
| 74 | }, |
| 75 | { |
| 76 | .sndif = XENSND_PCM_FORMAT_S8, |
| 77 | .alsa = SNDRV_PCM_FORMAT_S8 |
| 78 | }, |
| 79 | { |
| 80 | .sndif = XENSND_PCM_FORMAT_U16_LE, |
| 81 | .alsa = SNDRV_PCM_FORMAT_U16_LE |
| 82 | }, |
| 83 | { |
| 84 | .sndif = XENSND_PCM_FORMAT_U16_BE, |
| 85 | .alsa = SNDRV_PCM_FORMAT_U16_BE |
| 86 | }, |
| 87 | { |
| 88 | .sndif = XENSND_PCM_FORMAT_S16_LE, |
| 89 | .alsa = SNDRV_PCM_FORMAT_S16_LE |
| 90 | }, |
| 91 | { |
| 92 | .sndif = XENSND_PCM_FORMAT_S16_BE, |
| 93 | .alsa = SNDRV_PCM_FORMAT_S16_BE |
| 94 | }, |
| 95 | { |
| 96 | .sndif = XENSND_PCM_FORMAT_U24_LE, |
| 97 | .alsa = SNDRV_PCM_FORMAT_U24_LE |
| 98 | }, |
| 99 | { |
| 100 | .sndif = XENSND_PCM_FORMAT_U24_BE, |
| 101 | .alsa = SNDRV_PCM_FORMAT_U24_BE |
| 102 | }, |
| 103 | { |
| 104 | .sndif = XENSND_PCM_FORMAT_S24_LE, |
| 105 | .alsa = SNDRV_PCM_FORMAT_S24_LE |
| 106 | }, |
| 107 | { |
| 108 | .sndif = XENSND_PCM_FORMAT_S24_BE, |
| 109 | .alsa = SNDRV_PCM_FORMAT_S24_BE |
| 110 | }, |
| 111 | { |
| 112 | .sndif = XENSND_PCM_FORMAT_U32_LE, |
| 113 | .alsa = SNDRV_PCM_FORMAT_U32_LE |
| 114 | }, |
| 115 | { |
| 116 | .sndif = XENSND_PCM_FORMAT_U32_BE, |
| 117 | .alsa = SNDRV_PCM_FORMAT_U32_BE |
| 118 | }, |
| 119 | { |
| 120 | .sndif = XENSND_PCM_FORMAT_S32_LE, |
| 121 | .alsa = SNDRV_PCM_FORMAT_S32_LE |
| 122 | }, |
| 123 | { |
| 124 | .sndif = XENSND_PCM_FORMAT_S32_BE, |
| 125 | .alsa = SNDRV_PCM_FORMAT_S32_BE |
| 126 | }, |
| 127 | { |
| 128 | .sndif = XENSND_PCM_FORMAT_A_LAW, |
| 129 | .alsa = SNDRV_PCM_FORMAT_A_LAW |
| 130 | }, |
| 131 | { |
| 132 | .sndif = XENSND_PCM_FORMAT_MU_LAW, |
| 133 | .alsa = SNDRV_PCM_FORMAT_MU_LAW |
| 134 | }, |
| 135 | { |
| 136 | .sndif = XENSND_PCM_FORMAT_F32_LE, |
| 137 | .alsa = SNDRV_PCM_FORMAT_FLOAT_LE |
| 138 | }, |
| 139 | { |
| 140 | .sndif = XENSND_PCM_FORMAT_F32_BE, |
| 141 | .alsa = SNDRV_PCM_FORMAT_FLOAT_BE |
| 142 | }, |
| 143 | { |
| 144 | .sndif = XENSND_PCM_FORMAT_F64_LE, |
| 145 | .alsa = SNDRV_PCM_FORMAT_FLOAT64_LE |
| 146 | }, |
| 147 | { |
| 148 | .sndif = XENSND_PCM_FORMAT_F64_BE, |
| 149 | .alsa = SNDRV_PCM_FORMAT_FLOAT64_BE |
| 150 | }, |
| 151 | { |
| 152 | .sndif = XENSND_PCM_FORMAT_IEC958_SUBFRAME_LE, |
| 153 | .alsa = SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE |
| 154 | }, |
| 155 | { |
| 156 | .sndif = XENSND_PCM_FORMAT_IEC958_SUBFRAME_BE, |
| 157 | .alsa = SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE |
| 158 | }, |
| 159 | { |
| 160 | .sndif = XENSND_PCM_FORMAT_IMA_ADPCM, |
| 161 | .alsa = SNDRV_PCM_FORMAT_IMA_ADPCM |
| 162 | }, |
| 163 | { |
| 164 | .sndif = XENSND_PCM_FORMAT_MPEG, |
| 165 | .alsa = SNDRV_PCM_FORMAT_MPEG |
| 166 | }, |
| 167 | { |
| 168 | .sndif = XENSND_PCM_FORMAT_GSM, |
| 169 | .alsa = SNDRV_PCM_FORMAT_GSM |
| 170 | }, |
| 171 | }; |
| 172 | |
| 173 | static int to_sndif_format(snd_pcm_format_t format) |
| 174 | { |
| 175 | int i; |
| 176 | |
| 177 | for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++) |
| 178 | if (ALSA_SNDIF_FORMATS[i].alsa == format) |
| 179 | return ALSA_SNDIF_FORMATS[i].sndif; |
| 180 | |
| 181 | return -EINVAL; |
| 182 | } |
| 183 | |
| 184 | static u64 to_sndif_formats_mask(u64 alsa_formats) |
| 185 | { |
| 186 | u64 mask; |
| 187 | int i; |
| 188 | |
| 189 | mask = 0; |
| 190 | for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++) |
| 191 | if (1 << ALSA_SNDIF_FORMATS[i].alsa & alsa_formats) |
| 192 | mask |= 1 << ALSA_SNDIF_FORMATS[i].sndif; |
| 193 | |
| 194 | return mask; |
| 195 | } |
| 196 | |
| 197 | static u64 to_alsa_formats_mask(u64 sndif_formats) |
| 198 | { |
| 199 | u64 mask; |
| 200 | int i; |
| 201 | |
| 202 | mask = 0; |
| 203 | for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++) |
| 204 | if (1 << ALSA_SNDIF_FORMATS[i].sndif & sndif_formats) |
| 205 | mask |= 1 << ALSA_SNDIF_FORMATS[i].alsa; |
| 206 | |
| 207 | return mask; |
| 208 | } |
| 209 | |
| 210 | static void stream_clear(struct xen_snd_front_pcm_stream_info *stream) |
| 211 | { |
| 212 | stream->is_open = false; |
| 213 | stream->be_cur_frame = 0; |
| 214 | stream->out_frames = 0; |
| 215 | atomic_set(&stream->hw_ptr, 0); |
| 216 | xen_snd_front_evtchnl_pair_clear(stream->evt_pair); |
| 217 | xen_snd_front_shbuf_clear(&stream->sh_buf); |
| 218 | } |
| 219 | |
| 220 | static void stream_free(struct xen_snd_front_pcm_stream_info *stream) |
| 221 | { |
| 222 | xen_snd_front_shbuf_free(&stream->sh_buf); |
| 223 | stream_clear(stream); |
| 224 | } |
| 225 | |
| 226 | static struct xen_snd_front_pcm_stream_info * |
| 227 | stream_get(struct snd_pcm_substream *substream) |
| 228 | { |
| 229 | struct xen_snd_front_pcm_instance_info *pcm_instance = |
| 230 | snd_pcm_substream_chip(substream); |
| 231 | struct xen_snd_front_pcm_stream_info *stream; |
| 232 | |
| 233 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| 234 | stream = &pcm_instance->streams_pb[substream->number]; |
| 235 | else |
| 236 | stream = &pcm_instance->streams_cap[substream->number]; |
| 237 | |
| 238 | return stream; |
| 239 | } |
| 240 | |
| 241 | static int alsa_hw_rule(struct snd_pcm_hw_params *params, |
| 242 | struct snd_pcm_hw_rule *rule) |
| 243 | { |
| 244 | struct xen_snd_front_pcm_stream_info *stream = rule->private; |
| 245 | struct device *dev = &stream->front_info->xb_dev->dev; |
| 246 | struct snd_mask *formats = |
| 247 | hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); |
| 248 | struct snd_interval *rates = |
| 249 | hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); |
| 250 | struct snd_interval *channels = |
| 251 | hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); |
| 252 | struct snd_interval *period = |
| 253 | hw_param_interval(params, |
| 254 | SNDRV_PCM_HW_PARAM_PERIOD_SIZE); |
| 255 | struct snd_interval *buffer = |
| 256 | hw_param_interval(params, |
| 257 | SNDRV_PCM_HW_PARAM_BUFFER_SIZE); |
| 258 | struct xensnd_query_hw_param req; |
| 259 | struct xensnd_query_hw_param resp; |
| 260 | struct snd_interval interval; |
| 261 | struct snd_mask mask; |
| 262 | u64 sndif_formats; |
| 263 | int changed, ret; |
| 264 | |
| 265 | /* Collect all the values we need for the query. */ |
| 266 | |
| 267 | req.formats = to_sndif_formats_mask((u64)formats->bits[0] | |
| 268 | (u64)(formats->bits[1]) << 32); |
| 269 | |
| 270 | req.rates.min = rates->min; |
| 271 | req.rates.max = rates->max; |
| 272 | |
| 273 | req.channels.min = channels->min; |
| 274 | req.channels.max = channels->max; |
| 275 | |
| 276 | req.buffer.min = buffer->min; |
| 277 | req.buffer.max = buffer->max; |
| 278 | |
| 279 | req.period.min = period->min; |
| 280 | req.period.max = period->max; |
| 281 | |
| 282 | ret = xen_snd_front_stream_query_hw_param(&stream->evt_pair->req, |
| 283 | &req, &resp); |
| 284 | if (ret < 0) { |
| 285 | /* Check if this is due to backend communication error. */ |
| 286 | if (ret == -EIO || ret == -ETIMEDOUT) |
| 287 | dev_err(dev, "Failed to query ALSA HW parameters\n"); |
| 288 | return ret; |
| 289 | } |
| 290 | |
| 291 | /* Refine HW parameters after the query. */ |
| 292 | changed = 0; |
| 293 | |
| 294 | sndif_formats = to_alsa_formats_mask(resp.formats); |
| 295 | snd_mask_none(&mask); |
| 296 | mask.bits[0] = (u32)sndif_formats; |
| 297 | mask.bits[1] = (u32)(sndif_formats >> 32); |
| 298 | ret = snd_mask_refine(formats, &mask); |
| 299 | if (ret < 0) |
| 300 | return ret; |
| 301 | changed |= ret; |
| 302 | |
| 303 | interval.openmin = 0; |
| 304 | interval.openmax = 0; |
| 305 | interval.integer = 1; |
| 306 | |
| 307 | interval.min = resp.rates.min; |
| 308 | interval.max = resp.rates.max; |
| 309 | ret = snd_interval_refine(rates, &interval); |
| 310 | if (ret < 0) |
| 311 | return ret; |
| 312 | changed |= ret; |
| 313 | |
| 314 | interval.min = resp.channels.min; |
| 315 | interval.max = resp.channels.max; |
| 316 | ret = snd_interval_refine(channels, &interval); |
| 317 | if (ret < 0) |
| 318 | return ret; |
| 319 | changed |= ret; |
| 320 | |
| 321 | interval.min = resp.buffer.min; |
| 322 | interval.max = resp.buffer.max; |
| 323 | ret = snd_interval_refine(buffer, &interval); |
| 324 | if (ret < 0) |
| 325 | return ret; |
| 326 | changed |= ret; |
| 327 | |
| 328 | interval.min = resp.period.min; |
| 329 | interval.max = resp.period.max; |
| 330 | ret = snd_interval_refine(period, &interval); |
| 331 | if (ret < 0) |
| 332 | return ret; |
| 333 | changed |= ret; |
| 334 | |
| 335 | return changed; |
| 336 | } |
| 337 | |
| 338 | static int alsa_open(struct snd_pcm_substream *substream) |
| 339 | { |
| 340 | struct xen_snd_front_pcm_instance_info *pcm_instance = |
| 341 | snd_pcm_substream_chip(substream); |
| 342 | struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); |
| 343 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 344 | struct xen_snd_front_info *front_info = |
| 345 | pcm_instance->card_info->front_info; |
| 346 | struct device *dev = &front_info->xb_dev->dev; |
| 347 | int ret; |
| 348 | |
| 349 | /* |
| 350 | * Return our HW properties: override defaults with those configured |
| 351 | * via XenStore. |
| 352 | */ |
| 353 | runtime->hw = stream->pcm_hw; |
| 354 | runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP | |
| 355 | SNDRV_PCM_INFO_MMAP_VALID | |
| 356 | SNDRV_PCM_INFO_DOUBLE | |
| 357 | SNDRV_PCM_INFO_BATCH | |
| 358 | SNDRV_PCM_INFO_NONINTERLEAVED | |
| 359 | SNDRV_PCM_INFO_RESUME | |
| 360 | SNDRV_PCM_INFO_PAUSE); |
| 361 | runtime->hw.info |= SNDRV_PCM_INFO_INTERLEAVED; |
| 362 | |
| 363 | stream->evt_pair = &front_info->evt_pairs[stream->index]; |
| 364 | |
| 365 | stream->front_info = front_info; |
| 366 | |
| 367 | stream->evt_pair->evt.u.evt.substream = substream; |
| 368 | |
| 369 | stream_clear(stream); |
| 370 | |
| 371 | xen_snd_front_evtchnl_pair_set_connected(stream->evt_pair, true); |
| 372 | |
| 373 | ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, |
| 374 | alsa_hw_rule, stream, |
| 375 | SNDRV_PCM_HW_PARAM_FORMAT, -1); |
| 376 | if (ret) { |
| 377 | dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_FORMAT\n"); |
| 378 | return ret; |
| 379 | } |
| 380 | |
| 381 | ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, |
| 382 | alsa_hw_rule, stream, |
| 383 | SNDRV_PCM_HW_PARAM_RATE, -1); |
| 384 | if (ret) { |
| 385 | dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_RATE\n"); |
| 386 | return ret; |
| 387 | } |
| 388 | |
| 389 | ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, |
| 390 | alsa_hw_rule, stream, |
| 391 | SNDRV_PCM_HW_PARAM_CHANNELS, -1); |
| 392 | if (ret) { |
| 393 | dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_CHANNELS\n"); |
| 394 | return ret; |
| 395 | } |
| 396 | |
| 397 | ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, |
| 398 | alsa_hw_rule, stream, |
| 399 | SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); |
| 400 | if (ret) { |
| 401 | dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_PERIOD_SIZE\n"); |
| 402 | return ret; |
| 403 | } |
| 404 | |
| 405 | ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, |
| 406 | alsa_hw_rule, stream, |
| 407 | SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); |
| 408 | if (ret) { |
| 409 | dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_BUFFER_SIZE\n"); |
| 410 | return ret; |
| 411 | } |
| 412 | |
| 413 | return 0; |
| 414 | } |
| 415 | |
| 416 | static int alsa_close(struct snd_pcm_substream *substream) |
| 417 | { |
| 418 | struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); |
| 419 | |
| 420 | xen_snd_front_evtchnl_pair_set_connected(stream->evt_pair, false); |
| 421 | return 0; |
| 422 | } |
| 423 | |
| 424 | static int alsa_hw_params(struct snd_pcm_substream *substream, |
| 425 | struct snd_pcm_hw_params *params) |
| 426 | { |
| 427 | struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); |
| 428 | int ret; |
| 429 | |
| 430 | /* |
| 431 | * This callback may be called multiple times, |
| 432 | * so free the previously allocated shared buffer if any. |
| 433 | */ |
| 434 | stream_free(stream); |
| 435 | |
| 436 | ret = xen_snd_front_shbuf_alloc(stream->front_info->xb_dev, |
| 437 | &stream->sh_buf, |
| 438 | params_buffer_bytes(params)); |
| 439 | if (ret < 0) { |
| 440 | stream_free(stream); |
| 441 | dev_err(&stream->front_info->xb_dev->dev, |
| 442 | "Failed to allocate buffers for stream with index %d\n", |
| 443 | stream->index); |
| 444 | return ret; |
| 445 | } |
| 446 | |
| 447 | return 0; |
| 448 | } |
| 449 | |
| 450 | static int alsa_hw_free(struct snd_pcm_substream *substream) |
| 451 | { |
| 452 | struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); |
| 453 | int ret; |
| 454 | |
| 455 | ret = xen_snd_front_stream_close(&stream->evt_pair->req); |
| 456 | stream_free(stream); |
| 457 | return ret; |
| 458 | } |
| 459 | |
| 460 | static int alsa_prepare(struct snd_pcm_substream *substream) |
| 461 | { |
| 462 | struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); |
| 463 | |
| 464 | if (!stream->is_open) { |
| 465 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 466 | u8 sndif_format; |
| 467 | int ret; |
| 468 | |
Colin Ian King | 014cea5 | 2018-05-27 22:32:19 +0100 | [diff] [blame] | 469 | ret = to_sndif_format(runtime->format); |
| 470 | if (ret < 0) { |
Oleksandr Andrushchenko | 1cee559 | 2018-05-14 09:27:41 +0300 | [diff] [blame] | 471 | dev_err(&stream->front_info->xb_dev->dev, |
| 472 | "Unsupported sample format: %d\n", |
| 473 | runtime->format); |
Colin Ian King | 014cea5 | 2018-05-27 22:32:19 +0100 | [diff] [blame] | 474 | return ret; |
Oleksandr Andrushchenko | 1cee559 | 2018-05-14 09:27:41 +0300 | [diff] [blame] | 475 | } |
Colin Ian King | 014cea5 | 2018-05-27 22:32:19 +0100 | [diff] [blame] | 476 | sndif_format = ret; |
Oleksandr Andrushchenko | 1cee559 | 2018-05-14 09:27:41 +0300 | [diff] [blame] | 477 | |
| 478 | ret = xen_snd_front_stream_prepare(&stream->evt_pair->req, |
| 479 | &stream->sh_buf, |
| 480 | sndif_format, |
| 481 | runtime->channels, |
| 482 | runtime->rate, |
| 483 | snd_pcm_lib_buffer_bytes(substream), |
| 484 | snd_pcm_lib_period_bytes(substream)); |
| 485 | if (ret < 0) |
| 486 | return ret; |
| 487 | |
| 488 | stream->is_open = true; |
| 489 | } |
| 490 | |
| 491 | return 0; |
| 492 | } |
| 493 | |
| 494 | static int alsa_trigger(struct snd_pcm_substream *substream, int cmd) |
| 495 | { |
| 496 | struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); |
| 497 | int type; |
| 498 | |
| 499 | switch (cmd) { |
| 500 | case SNDRV_PCM_TRIGGER_START: |
| 501 | type = XENSND_OP_TRIGGER_START; |
| 502 | break; |
| 503 | |
| 504 | case SNDRV_PCM_TRIGGER_RESUME: |
| 505 | type = XENSND_OP_TRIGGER_RESUME; |
| 506 | break; |
| 507 | |
| 508 | case SNDRV_PCM_TRIGGER_STOP: |
| 509 | type = XENSND_OP_TRIGGER_STOP; |
| 510 | break; |
| 511 | |
| 512 | case SNDRV_PCM_TRIGGER_SUSPEND: |
| 513 | type = XENSND_OP_TRIGGER_PAUSE; |
| 514 | break; |
| 515 | |
| 516 | default: |
| 517 | return -EINVAL; |
| 518 | } |
| 519 | |
| 520 | return xen_snd_front_stream_trigger(&stream->evt_pair->req, type); |
| 521 | } |
| 522 | |
| 523 | void xen_snd_front_alsa_handle_cur_pos(struct xen_snd_front_evtchnl *evtchnl, |
| 524 | u64 pos_bytes) |
| 525 | { |
| 526 | struct snd_pcm_substream *substream = evtchnl->u.evt.substream; |
| 527 | struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); |
| 528 | snd_pcm_uframes_t delta, new_hw_ptr, cur_frame; |
| 529 | |
| 530 | cur_frame = bytes_to_frames(substream->runtime, pos_bytes); |
| 531 | |
| 532 | delta = cur_frame - stream->be_cur_frame; |
| 533 | stream->be_cur_frame = cur_frame; |
| 534 | |
| 535 | new_hw_ptr = (snd_pcm_uframes_t)atomic_read(&stream->hw_ptr); |
| 536 | new_hw_ptr = (new_hw_ptr + delta) % substream->runtime->buffer_size; |
| 537 | atomic_set(&stream->hw_ptr, (int)new_hw_ptr); |
| 538 | |
| 539 | stream->out_frames += delta; |
| 540 | if (stream->out_frames > substream->runtime->period_size) { |
| 541 | stream->out_frames %= substream->runtime->period_size; |
| 542 | snd_pcm_period_elapsed(substream); |
| 543 | } |
| 544 | } |
| 545 | |
| 546 | static snd_pcm_uframes_t alsa_pointer(struct snd_pcm_substream *substream) |
| 547 | { |
| 548 | struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); |
| 549 | |
| 550 | return (snd_pcm_uframes_t)atomic_read(&stream->hw_ptr); |
| 551 | } |
| 552 | |
| 553 | static int alsa_pb_copy_user(struct snd_pcm_substream *substream, |
| 554 | int channel, unsigned long pos, void __user *src, |
| 555 | unsigned long count) |
| 556 | { |
| 557 | struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); |
| 558 | |
| 559 | if (unlikely(pos + count > stream->sh_buf.buffer_sz)) |
| 560 | return -EINVAL; |
| 561 | |
| 562 | if (copy_from_user(stream->sh_buf.buffer + pos, src, count)) |
| 563 | return -EFAULT; |
| 564 | |
| 565 | return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count); |
| 566 | } |
| 567 | |
| 568 | static int alsa_pb_copy_kernel(struct snd_pcm_substream *substream, |
| 569 | int channel, unsigned long pos, void *src, |
| 570 | unsigned long count) |
| 571 | { |
| 572 | struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); |
| 573 | |
| 574 | if (unlikely(pos + count > stream->sh_buf.buffer_sz)) |
| 575 | return -EINVAL; |
| 576 | |
| 577 | memcpy(stream->sh_buf.buffer + pos, src, count); |
| 578 | |
| 579 | return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count); |
| 580 | } |
| 581 | |
| 582 | static int alsa_cap_copy_user(struct snd_pcm_substream *substream, |
| 583 | int channel, unsigned long pos, void __user *dst, |
| 584 | unsigned long count) |
| 585 | { |
| 586 | struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); |
| 587 | int ret; |
| 588 | |
| 589 | if (unlikely(pos + count > stream->sh_buf.buffer_sz)) |
| 590 | return -EINVAL; |
| 591 | |
| 592 | ret = xen_snd_front_stream_read(&stream->evt_pair->req, pos, count); |
| 593 | if (ret < 0) |
| 594 | return ret; |
| 595 | |
| 596 | return copy_to_user(dst, stream->sh_buf.buffer + pos, count) ? |
| 597 | -EFAULT : 0; |
| 598 | } |
| 599 | |
| 600 | static int alsa_cap_copy_kernel(struct snd_pcm_substream *substream, |
| 601 | int channel, unsigned long pos, void *dst, |
| 602 | unsigned long count) |
| 603 | { |
| 604 | struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); |
| 605 | int ret; |
| 606 | |
| 607 | if (unlikely(pos + count > stream->sh_buf.buffer_sz)) |
| 608 | return -EINVAL; |
| 609 | |
| 610 | ret = xen_snd_front_stream_read(&stream->evt_pair->req, pos, count); |
| 611 | if (ret < 0) |
| 612 | return ret; |
| 613 | |
| 614 | memcpy(dst, stream->sh_buf.buffer + pos, count); |
| 615 | |
| 616 | return 0; |
| 617 | } |
| 618 | |
| 619 | static int alsa_pb_fill_silence(struct snd_pcm_substream *substream, |
| 620 | int channel, unsigned long pos, |
| 621 | unsigned long count) |
| 622 | { |
| 623 | struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); |
| 624 | |
| 625 | if (unlikely(pos + count > stream->sh_buf.buffer_sz)) |
| 626 | return -EINVAL; |
| 627 | |
| 628 | memset(stream->sh_buf.buffer + pos, 0, count); |
| 629 | |
| 630 | return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count); |
| 631 | } |
| 632 | |
| 633 | /* |
| 634 | * FIXME: The mmaped data transfer is asynchronous and there is no |
| 635 | * ack signal from user-space when it is done. This is the |
| 636 | * reason it is not implemented in the PV driver as we do need |
| 637 | * to know when the buffer can be transferred to the backend. |
| 638 | */ |
| 639 | |
| 640 | static struct snd_pcm_ops snd_drv_alsa_playback_ops = { |
| 641 | .open = alsa_open, |
| 642 | .close = alsa_close, |
| 643 | .ioctl = snd_pcm_lib_ioctl, |
| 644 | .hw_params = alsa_hw_params, |
| 645 | .hw_free = alsa_hw_free, |
| 646 | .prepare = alsa_prepare, |
| 647 | .trigger = alsa_trigger, |
| 648 | .pointer = alsa_pointer, |
| 649 | .copy_user = alsa_pb_copy_user, |
| 650 | .copy_kernel = alsa_pb_copy_kernel, |
| 651 | .fill_silence = alsa_pb_fill_silence, |
| 652 | }; |
| 653 | |
| 654 | static struct snd_pcm_ops snd_drv_alsa_capture_ops = { |
| 655 | .open = alsa_open, |
| 656 | .close = alsa_close, |
| 657 | .ioctl = snd_pcm_lib_ioctl, |
| 658 | .hw_params = alsa_hw_params, |
| 659 | .hw_free = alsa_hw_free, |
| 660 | .prepare = alsa_prepare, |
| 661 | .trigger = alsa_trigger, |
| 662 | .pointer = alsa_pointer, |
| 663 | .copy_user = alsa_cap_copy_user, |
| 664 | .copy_kernel = alsa_cap_copy_kernel, |
| 665 | }; |
| 666 | |
| 667 | static int new_pcm_instance(struct xen_snd_front_card_info *card_info, |
| 668 | struct xen_front_cfg_pcm_instance *instance_cfg, |
| 669 | struct xen_snd_front_pcm_instance_info *pcm_instance_info) |
| 670 | { |
| 671 | struct snd_pcm *pcm; |
| 672 | int ret, i; |
| 673 | |
| 674 | dev_dbg(&card_info->front_info->xb_dev->dev, |
| 675 | "New PCM device \"%s\" with id %d playback %d capture %d", |
| 676 | instance_cfg->name, |
| 677 | instance_cfg->device_id, |
| 678 | instance_cfg->num_streams_pb, |
| 679 | instance_cfg->num_streams_cap); |
| 680 | |
| 681 | pcm_instance_info->card_info = card_info; |
| 682 | |
| 683 | pcm_instance_info->pcm_hw = instance_cfg->pcm_hw; |
| 684 | |
| 685 | if (instance_cfg->num_streams_pb) { |
| 686 | pcm_instance_info->streams_pb = |
| 687 | devm_kcalloc(&card_info->card->card_dev, |
| 688 | instance_cfg->num_streams_pb, |
| 689 | sizeof(struct xen_snd_front_pcm_stream_info), |
| 690 | GFP_KERNEL); |
| 691 | if (!pcm_instance_info->streams_pb) |
| 692 | return -ENOMEM; |
| 693 | } |
| 694 | |
| 695 | if (instance_cfg->num_streams_cap) { |
| 696 | pcm_instance_info->streams_cap = |
| 697 | devm_kcalloc(&card_info->card->card_dev, |
| 698 | instance_cfg->num_streams_cap, |
| 699 | sizeof(struct xen_snd_front_pcm_stream_info), |
| 700 | GFP_KERNEL); |
| 701 | if (!pcm_instance_info->streams_cap) |
| 702 | return -ENOMEM; |
| 703 | } |
| 704 | |
| 705 | pcm_instance_info->num_pcm_streams_pb = |
| 706 | instance_cfg->num_streams_pb; |
| 707 | pcm_instance_info->num_pcm_streams_cap = |
| 708 | instance_cfg->num_streams_cap; |
| 709 | |
| 710 | for (i = 0; i < pcm_instance_info->num_pcm_streams_pb; i++) { |
| 711 | pcm_instance_info->streams_pb[i].pcm_hw = |
| 712 | instance_cfg->streams_pb[i].pcm_hw; |
| 713 | pcm_instance_info->streams_pb[i].index = |
| 714 | instance_cfg->streams_pb[i].index; |
| 715 | } |
| 716 | |
| 717 | for (i = 0; i < pcm_instance_info->num_pcm_streams_cap; i++) { |
| 718 | pcm_instance_info->streams_cap[i].pcm_hw = |
| 719 | instance_cfg->streams_cap[i].pcm_hw; |
| 720 | pcm_instance_info->streams_cap[i].index = |
| 721 | instance_cfg->streams_cap[i].index; |
| 722 | } |
| 723 | |
| 724 | ret = snd_pcm_new(card_info->card, instance_cfg->name, |
| 725 | instance_cfg->device_id, |
| 726 | instance_cfg->num_streams_pb, |
| 727 | instance_cfg->num_streams_cap, |
| 728 | &pcm); |
| 729 | if (ret < 0) |
| 730 | return ret; |
| 731 | |
| 732 | pcm->private_data = pcm_instance_info; |
| 733 | pcm->info_flags = 0; |
| 734 | /* we want to handle all PCM operations in non-atomic context */ |
| 735 | pcm->nonatomic = true; |
| 736 | strncpy(pcm->name, "Virtual card PCM", sizeof(pcm->name)); |
| 737 | |
| 738 | if (instance_cfg->num_streams_pb) |
| 739 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, |
| 740 | &snd_drv_alsa_playback_ops); |
| 741 | |
| 742 | if (instance_cfg->num_streams_cap) |
| 743 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, |
| 744 | &snd_drv_alsa_capture_ops); |
| 745 | |
| 746 | pcm_instance_info->pcm = pcm; |
| 747 | return 0; |
| 748 | } |
| 749 | |
| 750 | int xen_snd_front_alsa_init(struct xen_snd_front_info *front_info) |
| 751 | { |
| 752 | struct device *dev = &front_info->xb_dev->dev; |
| 753 | struct xen_front_cfg_card *cfg = &front_info->cfg; |
| 754 | struct xen_snd_front_card_info *card_info; |
| 755 | struct snd_card *card; |
| 756 | int ret, i; |
| 757 | |
| 758 | dev_dbg(dev, "Creating virtual sound card\n"); |
| 759 | |
| 760 | ret = snd_card_new(dev, 0, XENSND_DRIVER_NAME, THIS_MODULE, |
| 761 | sizeof(struct xen_snd_front_card_info), &card); |
| 762 | if (ret < 0) |
| 763 | return ret; |
| 764 | |
| 765 | card_info = card->private_data; |
| 766 | card_info->front_info = front_info; |
| 767 | front_info->card_info = card_info; |
| 768 | card_info->card = card; |
| 769 | card_info->pcm_instances = |
| 770 | devm_kcalloc(dev, cfg->num_pcm_instances, |
| 771 | sizeof(struct xen_snd_front_pcm_instance_info), |
| 772 | GFP_KERNEL); |
| 773 | if (!card_info->pcm_instances) { |
| 774 | ret = -ENOMEM; |
| 775 | goto fail; |
| 776 | } |
| 777 | |
| 778 | card_info->num_pcm_instances = cfg->num_pcm_instances; |
| 779 | card_info->pcm_hw = cfg->pcm_hw; |
| 780 | |
| 781 | for (i = 0; i < cfg->num_pcm_instances; i++) { |
| 782 | ret = new_pcm_instance(card_info, &cfg->pcm_instances[i], |
| 783 | &card_info->pcm_instances[i]); |
| 784 | if (ret < 0) |
| 785 | goto fail; |
| 786 | } |
| 787 | |
| 788 | strncpy(card->driver, XENSND_DRIVER_NAME, sizeof(card->driver)); |
| 789 | strncpy(card->shortname, cfg->name_short, sizeof(card->shortname)); |
| 790 | strncpy(card->longname, cfg->name_long, sizeof(card->longname)); |
| 791 | |
| 792 | ret = snd_card_register(card); |
| 793 | if (ret < 0) |
| 794 | goto fail; |
| 795 | |
| 796 | return 0; |
| 797 | |
| 798 | fail: |
| 799 | snd_card_free(card); |
| 800 | return ret; |
| 801 | } |
| 802 | |
| 803 | void xen_snd_front_alsa_fini(struct xen_snd_front_info *front_info) |
| 804 | { |
| 805 | struct xen_snd_front_card_info *card_info; |
| 806 | struct snd_card *card; |
| 807 | |
| 808 | card_info = front_info->card_info; |
| 809 | if (!card_info) |
| 810 | return; |
| 811 | |
| 812 | card = card_info->card; |
| 813 | if (!card) |
| 814 | return; |
| 815 | |
| 816 | dev_dbg(&front_info->xb_dev->dev, "Removing virtual sound card %d\n", |
| 817 | card->number); |
| 818 | snd_card_free(card); |
| 819 | |
| 820 | /* Card_info will be freed when destroying front_info->xb_dev->dev. */ |
| 821 | card_info->card = NULL; |
| 822 | } |