Baolin Wang | 42fea31 | 2019-01-29 16:04:45 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | // Copyright (C) 2019 Spreadtrum Communications Inc. |
| 3 | |
| 4 | #include <linux/dma-mapping.h> |
| 5 | #include <linux/dmaengine.h> |
| 6 | #include <linux/dma/sprd-dma.h> |
| 7 | #include <linux/kernel.h> |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/platform_device.h> |
| 10 | #include <sound/pcm.h> |
| 11 | #include <sound/pcm_params.h> |
| 12 | #include <sound/soc.h> |
| 13 | |
| 14 | #include "sprd-pcm-dma.h" |
| 15 | |
| 16 | #define DRV_NAME "sprd_pcm_dma" |
| 17 | #define SPRD_PCM_DMA_LINKLIST_SIZE 64 |
| 18 | #define SPRD_PCM_DMA_BRUST_LEN 640 |
| 19 | |
| 20 | struct sprd_pcm_dma_data { |
| 21 | struct dma_chan *chan; |
| 22 | struct dma_async_tx_descriptor *desc; |
| 23 | dma_cookie_t cookie; |
| 24 | dma_addr_t phys; |
| 25 | void *virt; |
| 26 | int pre_pointer; |
| 27 | }; |
| 28 | |
| 29 | struct sprd_pcm_dma_private { |
| 30 | struct snd_pcm_substream *substream; |
| 31 | struct sprd_pcm_dma_params *params; |
| 32 | struct sprd_pcm_dma_data data[SPRD_PCM_CHANNEL_MAX]; |
| 33 | int hw_chan; |
| 34 | int dma_addr_offset; |
| 35 | }; |
| 36 | |
| 37 | static const struct snd_pcm_hardware sprd_pcm_hardware = { |
| 38 | .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | |
| 39 | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_PAUSE | |
| 40 | SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_NO_PERIOD_WAKEUP, |
| 41 | .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE, |
| 42 | .period_bytes_min = 1, |
| 43 | .period_bytes_max = 64 * 1024, |
| 44 | .periods_min = 1, |
| 45 | .periods_max = PAGE_SIZE / SPRD_PCM_DMA_LINKLIST_SIZE, |
| 46 | .buffer_bytes_max = 64 * 1024, |
| 47 | }; |
| 48 | |
| 49 | static int sprd_pcm_open(struct snd_pcm_substream *substream) |
| 50 | { |
| 51 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 52 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| 53 | struct snd_soc_component *component = |
| 54 | snd_soc_rtdcom_lookup(rtd, DRV_NAME); |
| 55 | struct device *dev = component->dev; |
| 56 | struct sprd_pcm_dma_private *dma_private; |
| 57 | int hw_chan = SPRD_PCM_CHANNEL_MAX; |
| 58 | int size, ret, i; |
| 59 | |
| 60 | snd_soc_set_runtime_hwparams(substream, &sprd_pcm_hardware); |
| 61 | |
| 62 | ret = snd_pcm_hw_constraint_step(runtime, 0, |
| 63 | SNDRV_PCM_HW_PARAM_PERIOD_BYTES, |
| 64 | SPRD_PCM_DMA_BRUST_LEN); |
| 65 | if (ret < 0) |
| 66 | return ret; |
| 67 | |
| 68 | ret = snd_pcm_hw_constraint_step(runtime, 0, |
| 69 | SNDRV_PCM_HW_PARAM_BUFFER_BYTES, |
| 70 | SPRD_PCM_DMA_BRUST_LEN); |
| 71 | if (ret < 0) |
| 72 | return ret; |
| 73 | |
| 74 | ret = snd_pcm_hw_constraint_integer(runtime, |
| 75 | SNDRV_PCM_HW_PARAM_PERIODS); |
| 76 | if (ret < 0) |
| 77 | return ret; |
| 78 | |
| 79 | dma_private = devm_kzalloc(dev, sizeof(*dma_private), GFP_KERNEL); |
| 80 | if (!dma_private) |
| 81 | return -ENOMEM; |
| 82 | |
| 83 | size = runtime->hw.periods_max * SPRD_PCM_DMA_LINKLIST_SIZE; |
| 84 | |
| 85 | for (i = 0; i < hw_chan; i++) { |
| 86 | struct sprd_pcm_dma_data *data = &dma_private->data[i]; |
| 87 | |
| 88 | data->virt = dmam_alloc_coherent(dev, size, &data->phys, |
| 89 | GFP_KERNEL); |
| 90 | if (!data->virt) { |
| 91 | ret = -ENOMEM; |
| 92 | goto error; |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | dma_private->hw_chan = hw_chan; |
| 97 | runtime->private_data = dma_private; |
| 98 | dma_private->substream = substream; |
| 99 | |
| 100 | return 0; |
| 101 | |
| 102 | error: |
| 103 | for (i = 0; i < hw_chan; i++) { |
| 104 | struct sprd_pcm_dma_data *data = &dma_private->data[i]; |
| 105 | |
| 106 | if (data->virt) |
| 107 | dmam_free_coherent(dev, size, data->virt, data->phys); |
| 108 | } |
| 109 | |
| 110 | devm_kfree(dev, dma_private); |
| 111 | return ret; |
| 112 | } |
| 113 | |
| 114 | static int sprd_pcm_close(struct snd_pcm_substream *substream) |
| 115 | { |
| 116 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 117 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| 118 | struct sprd_pcm_dma_private *dma_private = runtime->private_data; |
| 119 | struct snd_soc_component *component = |
| 120 | snd_soc_rtdcom_lookup(rtd, DRV_NAME); |
| 121 | struct device *dev = component->dev; |
| 122 | int size = runtime->hw.periods_max * SPRD_PCM_DMA_LINKLIST_SIZE; |
| 123 | int i; |
| 124 | |
| 125 | for (i = 0; i < dma_private->hw_chan; i++) { |
| 126 | struct sprd_pcm_dma_data *data = &dma_private->data[i]; |
| 127 | |
| 128 | dmam_free_coherent(dev, size, data->virt, data->phys); |
| 129 | } |
| 130 | |
| 131 | devm_kfree(dev, dma_private); |
| 132 | |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | static void sprd_pcm_dma_complete(void *data) |
| 137 | { |
| 138 | struct sprd_pcm_dma_private *dma_private = data; |
| 139 | struct snd_pcm_substream *substream = dma_private->substream; |
| 140 | |
| 141 | snd_pcm_period_elapsed(substream); |
| 142 | } |
| 143 | |
| 144 | static void sprd_pcm_release_dma_channel(struct snd_pcm_substream *substream) |
| 145 | { |
| 146 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 147 | struct sprd_pcm_dma_private *dma_private = runtime->private_data; |
| 148 | int i; |
| 149 | |
| 150 | for (i = 0; i < SPRD_PCM_CHANNEL_MAX; i++) { |
| 151 | struct sprd_pcm_dma_data *data = &dma_private->data[i]; |
| 152 | |
| 153 | if (data->chan) { |
| 154 | dma_release_channel(data->chan); |
| 155 | data->chan = NULL; |
| 156 | } |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | static int sprd_pcm_request_dma_channel(struct snd_pcm_substream *substream, |
| 161 | int channels) |
| 162 | { |
| 163 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 164 | struct sprd_pcm_dma_private *dma_private = runtime->private_data; |
| 165 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| 166 | struct snd_soc_component *component = |
| 167 | snd_soc_rtdcom_lookup(rtd, DRV_NAME); |
| 168 | struct device *dev = component->dev; |
| 169 | struct sprd_pcm_dma_params *dma_params = dma_private->params; |
| 170 | int i; |
| 171 | |
| 172 | if (channels > SPRD_PCM_CHANNEL_MAX) { |
| 173 | dev_err(dev, "invalid dma channel number:%d\n", channels); |
| 174 | return -EINVAL; |
| 175 | } |
| 176 | |
| 177 | for (i = 0; i < channels; i++) { |
| 178 | struct sprd_pcm_dma_data *data = &dma_private->data[i]; |
| 179 | |
| 180 | data->chan = dma_request_slave_channel(dev, |
| 181 | dma_params->chan_name[i]); |
| 182 | if (!data->chan) { |
| 183 | dev_err(dev, "failed to request dma channel:%s\n", |
| 184 | dma_params->chan_name[i]); |
| 185 | sprd_pcm_release_dma_channel(substream); |
| 186 | return -ENODEV; |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | static int sprd_pcm_hw_params(struct snd_pcm_substream *substream, |
| 194 | struct snd_pcm_hw_params *params) |
| 195 | { |
| 196 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 197 | struct sprd_pcm_dma_private *dma_private = runtime->private_data; |
| 198 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| 199 | struct snd_soc_component *component = |
| 200 | snd_soc_rtdcom_lookup(rtd, DRV_NAME); |
| 201 | struct sprd_pcm_dma_params *dma_params; |
| 202 | size_t totsize = params_buffer_bytes(params); |
| 203 | size_t period = params_period_bytes(params); |
| 204 | int channels = params_channels(params); |
| 205 | int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; |
| 206 | struct scatterlist *sg; |
| 207 | unsigned long flags; |
| 208 | int ret, i, j, sg_num; |
| 209 | |
| 210 | dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); |
| 211 | if (!dma_params) { |
| 212 | dev_warn(component->dev, "no dma parameters setting\n"); |
| 213 | dma_private->params = NULL; |
| 214 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
| 215 | runtime->dma_bytes = totsize; |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | if (!dma_private->params) { |
| 220 | dma_private->params = dma_params; |
| 221 | ret = sprd_pcm_request_dma_channel(substream, channels); |
| 222 | if (ret) |
| 223 | return ret; |
| 224 | } |
| 225 | |
| 226 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
| 227 | |
| 228 | runtime->dma_bytes = totsize; |
| 229 | sg_num = totsize / period; |
| 230 | dma_private->dma_addr_offset = totsize / channels; |
| 231 | |
| 232 | sg = devm_kcalloc(component->dev, sg_num, sizeof(*sg), GFP_KERNEL); |
| 233 | if (!sg) { |
| 234 | ret = -ENOMEM; |
| 235 | goto sg_err; |
| 236 | } |
| 237 | |
| 238 | for (i = 0; i < channels; i++) { |
| 239 | struct sprd_pcm_dma_data *data = &dma_private->data[i]; |
| 240 | struct dma_chan *chan = data->chan; |
| 241 | struct dma_slave_config config = { }; |
| 242 | struct sprd_dma_linklist link = { }; |
| 243 | enum dma_transfer_direction dir; |
| 244 | struct scatterlist *sgt = sg; |
| 245 | |
| 246 | config.src_maxburst = dma_params->fragment_len[i]; |
| 247 | config.src_addr_width = dma_params->datawidth[i]; |
| 248 | config.dst_addr_width = dma_params->datawidth[i]; |
| 249 | if (is_playback) { |
| 250 | config.src_addr = runtime->dma_addr + |
| 251 | i * dma_private->dma_addr_offset; |
| 252 | config.dst_addr = dma_params->dev_phys[i]; |
| 253 | dir = DMA_MEM_TO_DEV; |
| 254 | } else { |
| 255 | config.src_addr = dma_params->dev_phys[i]; |
| 256 | config.dst_addr = runtime->dma_addr + |
| 257 | i * dma_private->dma_addr_offset; |
| 258 | dir = DMA_DEV_TO_MEM; |
| 259 | } |
| 260 | |
| 261 | sg_init_table(sgt, sg_num); |
| 262 | for (j = 0; j < sg_num; j++, sgt++) { |
| 263 | u32 sg_len = period / channels; |
| 264 | |
| 265 | sg_dma_len(sgt) = sg_len; |
| 266 | sg_dma_address(sgt) = runtime->dma_addr + |
| 267 | i * dma_private->dma_addr_offset + sg_len * j; |
| 268 | } |
| 269 | |
| 270 | /* |
| 271 | * Configure the link-list address for the DMA engine link-list |
| 272 | * mode. |
| 273 | */ |
| 274 | link.virt_addr = (unsigned long)data->virt; |
| 275 | link.phy_addr = data->phys; |
| 276 | |
| 277 | ret = dmaengine_slave_config(chan, &config); |
| 278 | if (ret) { |
| 279 | dev_err(component->dev, |
| 280 | "failed to set slave configuration: %d\n", ret); |
| 281 | goto config_err; |
| 282 | } |
| 283 | |
| 284 | /* |
| 285 | * We configure the DMA request mode, interrupt mode, channel |
| 286 | * mode and channel trigger mode by the flags. |
| 287 | */ |
| 288 | flags = SPRD_DMA_FLAGS(SPRD_DMA_CHN_MODE_NONE, SPRD_DMA_NO_TRG, |
| 289 | SPRD_DMA_FRAG_REQ, SPRD_DMA_TRANS_INT); |
| 290 | data->desc = chan->device->device_prep_slave_sg(chan, sg, |
| 291 | sg_num, dir, |
| 292 | flags, &link); |
| 293 | if (!data->desc) { |
| 294 | dev_err(component->dev, "failed to prepare slave sg\n"); |
| 295 | ret = -ENOMEM; |
| 296 | goto config_err; |
| 297 | } |
| 298 | |
| 299 | if (!runtime->no_period_wakeup) { |
| 300 | data->desc->callback = sprd_pcm_dma_complete; |
| 301 | data->desc->callback_param = dma_private; |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | devm_kfree(component->dev, sg); |
| 306 | |
| 307 | return 0; |
| 308 | |
| 309 | config_err: |
| 310 | devm_kfree(component->dev, sg); |
| 311 | sg_err: |
| 312 | sprd_pcm_release_dma_channel(substream); |
| 313 | return ret; |
| 314 | } |
| 315 | |
| 316 | static int sprd_pcm_hw_free(struct snd_pcm_substream *substream) |
| 317 | { |
| 318 | snd_pcm_set_runtime_buffer(substream, NULL); |
| 319 | sprd_pcm_release_dma_channel(substream); |
| 320 | |
| 321 | return 0; |
| 322 | } |
| 323 | |
| 324 | static int sprd_pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
| 325 | { |
| 326 | struct sprd_pcm_dma_private *dma_private = |
| 327 | substream->runtime->private_data; |
| 328 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| 329 | struct snd_soc_component *component = |
| 330 | snd_soc_rtdcom_lookup(rtd, DRV_NAME); |
| 331 | int ret = 0, i; |
| 332 | |
| 333 | switch (cmd) { |
| 334 | case SNDRV_PCM_TRIGGER_START: |
| 335 | for (i = 0; i < dma_private->hw_chan; i++) { |
| 336 | struct sprd_pcm_dma_data *data = &dma_private->data[i]; |
| 337 | |
| 338 | if (!data->desc) |
| 339 | continue; |
| 340 | |
| 341 | data->cookie = dmaengine_submit(data->desc); |
| 342 | ret = dma_submit_error(data->cookie); |
| 343 | if (ret) { |
| 344 | dev_err(component->dev, |
| 345 | "failed to submit dma request: %d\n", |
| 346 | ret); |
| 347 | return ret; |
| 348 | } |
| 349 | |
| 350 | dma_async_issue_pending(data->chan); |
| 351 | } |
| 352 | |
| 353 | break; |
| 354 | case SNDRV_PCM_TRIGGER_RESUME: |
| 355 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| 356 | for (i = 0; i < dma_private->hw_chan; i++) { |
| 357 | struct sprd_pcm_dma_data *data = &dma_private->data[i]; |
| 358 | |
| 359 | if (data->chan) |
| 360 | dmaengine_resume(data->chan); |
| 361 | } |
| 362 | |
| 363 | break; |
| 364 | case SNDRV_PCM_TRIGGER_STOP: |
| 365 | for (i = 0; i < dma_private->hw_chan; i++) { |
| 366 | struct sprd_pcm_dma_data *data = &dma_private->data[i]; |
| 367 | |
| 368 | if (data->chan) |
| 369 | dmaengine_terminate_async(data->chan); |
| 370 | } |
| 371 | |
| 372 | break; |
| 373 | case SNDRV_PCM_TRIGGER_SUSPEND: |
| 374 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| 375 | for (i = 0; i < dma_private->hw_chan; i++) { |
| 376 | struct sprd_pcm_dma_data *data = &dma_private->data[i]; |
| 377 | |
| 378 | if (data->chan) |
| 379 | dmaengine_pause(data->chan); |
| 380 | } |
| 381 | |
| 382 | break; |
| 383 | default: |
| 384 | ret = -EINVAL; |
| 385 | } |
| 386 | |
| 387 | return ret; |
| 388 | } |
| 389 | |
| 390 | static snd_pcm_uframes_t sprd_pcm_pointer(struct snd_pcm_substream *substream) |
| 391 | { |
| 392 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 393 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| 394 | struct sprd_pcm_dma_private *dma_private = runtime->private_data; |
| 395 | struct snd_soc_component *component = |
| 396 | snd_soc_rtdcom_lookup(rtd, DRV_NAME); |
| 397 | int pointer[SPRD_PCM_CHANNEL_MAX]; |
| 398 | int bytes_of_pointer = 0, sel_max = 0, i; |
| 399 | snd_pcm_uframes_t x; |
| 400 | struct dma_tx_state state; |
| 401 | enum dma_status status; |
| 402 | |
| 403 | for (i = 0; i < dma_private->hw_chan; i++) { |
| 404 | struct sprd_pcm_dma_data *data = &dma_private->data[i]; |
| 405 | |
| 406 | if (!data->chan) |
| 407 | continue; |
| 408 | |
| 409 | status = dmaengine_tx_status(data->chan, data->cookie, &state); |
| 410 | if (status == DMA_ERROR) { |
| 411 | dev_err(component->dev, |
| 412 | "failed to get dma channel %d status\n", i); |
| 413 | return 0; |
| 414 | } |
| 415 | |
| 416 | /* |
| 417 | * We just get current transfer address from the DMA engine, so |
| 418 | * we need convert to current pointer. |
| 419 | */ |
| 420 | pointer[i] = state.residue - runtime->dma_addr - |
| 421 | i * dma_private->dma_addr_offset; |
| 422 | |
| 423 | if (i == 0) { |
| 424 | bytes_of_pointer = pointer[i]; |
| 425 | sel_max = pointer[i] < data->pre_pointer ? 1 : 0; |
| 426 | } else { |
| 427 | sel_max ^= pointer[i] < data->pre_pointer ? 1 : 0; |
| 428 | |
| 429 | if (sel_max) |
| 430 | bytes_of_pointer = |
| 431 | max(pointer[i], pointer[i - 1]) << 1; |
| 432 | else |
| 433 | bytes_of_pointer = |
| 434 | min(pointer[i], pointer[i - 1]) << 1; |
| 435 | } |
| 436 | |
| 437 | data->pre_pointer = pointer[i]; |
| 438 | } |
| 439 | |
| 440 | x = bytes_to_frames(runtime, bytes_of_pointer); |
| 441 | if (x == runtime->buffer_size) |
| 442 | x = 0; |
| 443 | |
| 444 | return x; |
| 445 | } |
| 446 | |
| 447 | static int sprd_pcm_mmap(struct snd_pcm_substream *substream, |
| 448 | struct vm_area_struct *vma) |
| 449 | { |
| 450 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 451 | |
| 452 | vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); |
| 453 | return remap_pfn_range(vma, vma->vm_start, |
| 454 | runtime->dma_addr >> PAGE_SHIFT, |
| 455 | vma->vm_end - vma->vm_start, |
| 456 | vma->vm_page_prot); |
| 457 | } |
| 458 | |
| 459 | static struct snd_pcm_ops sprd_pcm_ops = { |
| 460 | .open = sprd_pcm_open, |
| 461 | .close = sprd_pcm_close, |
| 462 | .ioctl = snd_pcm_lib_ioctl, |
| 463 | .hw_params = sprd_pcm_hw_params, |
| 464 | .hw_free = sprd_pcm_hw_free, |
| 465 | .trigger = sprd_pcm_trigger, |
| 466 | .pointer = sprd_pcm_pointer, |
| 467 | .mmap = sprd_pcm_mmap, |
| 468 | }; |
| 469 | |
| 470 | static int sprd_pcm_new(struct snd_soc_pcm_runtime *rtd) |
| 471 | { |
| 472 | struct snd_card *card = rtd->card->snd_card; |
| 473 | struct snd_pcm *pcm = rtd->pcm; |
| 474 | struct snd_pcm_substream *substream; |
| 475 | int ret; |
| 476 | |
| 477 | ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); |
| 478 | if (ret) |
| 479 | return ret; |
| 480 | |
| 481 | substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; |
| 482 | if (substream) { |
| 483 | ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev, |
| 484 | sprd_pcm_hardware.buffer_bytes_max, |
| 485 | &substream->dma_buffer); |
| 486 | if (ret) { |
| 487 | dev_err(card->dev, |
| 488 | "can't alloc playback dma buffer: %d\n", ret); |
| 489 | return ret; |
| 490 | } |
| 491 | } |
| 492 | |
| 493 | substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; |
| 494 | if (substream) { |
| 495 | ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev, |
| 496 | sprd_pcm_hardware.buffer_bytes_max, |
| 497 | &substream->dma_buffer); |
| 498 | if (ret) { |
| 499 | dev_err(card->dev, |
| 500 | "can't alloc capture dma buffer: %d\n", ret); |
| 501 | snd_dma_free_pages(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer); |
| 502 | return ret; |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | return 0; |
| 507 | } |
| 508 | |
| 509 | static void sprd_pcm_free(struct snd_pcm *pcm) |
| 510 | { |
| 511 | struct snd_pcm_substream *substream; |
| 512 | int i; |
| 513 | |
| 514 | for (i = 0; i < ARRAY_SIZE(pcm->streams); i++) { |
| 515 | substream = pcm->streams[i].substream; |
| 516 | if (substream) { |
| 517 | snd_dma_free_pages(&substream->dma_buffer); |
| 518 | substream->dma_buffer.area = NULL; |
| 519 | substream->dma_buffer.addr = 0; |
| 520 | } |
| 521 | } |
| 522 | } |
| 523 | |
| 524 | static const struct snd_soc_component_driver sprd_soc_component = { |
| 525 | .name = DRV_NAME, |
| 526 | .ops = &sprd_pcm_ops, |
| 527 | .pcm_new = sprd_pcm_new, |
| 528 | .pcm_free = sprd_pcm_free, |
| 529 | }; |
| 530 | |
| 531 | static int sprd_soc_platform_probe(struct platform_device *pdev) |
| 532 | { |
| 533 | int ret; |
| 534 | |
| 535 | ret = devm_snd_soc_register_component(&pdev->dev, &sprd_soc_component, |
| 536 | NULL, 0); |
| 537 | if (ret) |
| 538 | dev_err(&pdev->dev, "could not register platform:%d\n", ret); |
| 539 | |
| 540 | return ret; |
| 541 | } |
| 542 | |
| 543 | static const struct of_device_id sprd_pcm_of_match[] = { |
| 544 | { .compatible = "sprd,pcm-platform", }, |
| 545 | { }, |
| 546 | }; |
| 547 | MODULE_DEVICE_TABLE(of, sprd_pcm_of_match); |
| 548 | |
| 549 | static struct platform_driver sprd_pcm_driver = { |
| 550 | .driver = { |
| 551 | .name = "sprd-pcm-audio", |
| 552 | .of_match_table = sprd_pcm_of_match, |
| 553 | }, |
| 554 | |
| 555 | .probe = sprd_soc_platform_probe, |
| 556 | }; |
| 557 | |
| 558 | module_platform_driver(sprd_pcm_driver); |
| 559 | |
| 560 | MODULE_DESCRIPTION("Spreadtrum ASoC PCM DMA"); |
| 561 | MODULE_LICENSE("GPL v2"); |
| 562 | MODULE_ALIAS("platform:sprd-audio"); |