sound/soc/omap/omap-mcpdm.c

   1 /*
   2  * omap-mcpdm.c  --  OMAP ALSA SoC DAI driver using McPDM port
   3  *
   4  * Copyright (C) 2009 - 2011 Texas Instruments
   5  *
   6  * Author: Misael Lopez Cruz <misael.lopez@ti.com>
   7  * Contact: Jorge Eduardo Candelaria <x0107209@ti.com>
   8  *          Margarita Olaya <magi.olaya@ti.com>
   9  *          Peter Ujfalusi <peter.ujfalusi@ti.com>
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * version 2 as published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  23  * 02110-1301 USA
  24  *
  25  */
  26
  27 #include <linux/init.h>
  28 #include <linux/module.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/err.h>
  32 #include <linux/io.h>
  33 #include <linux/irq.h>
  34 #include <linux/slab.h>
  35 #include <linux/pm_runtime.h>
  36 #include <linux/of_device.h>
  37
  38 #include <sound/core.h>
  39 #include <sound/pcm.h>
  40 #include <sound/pcm_params.h>
  41 #include <sound/soc.h>
  42 #include <sound/dmaengine_pcm.h>
  43
  44 #include "omap-mcpdm.h"
  45
  46 struct mcpdm_link_config {
  47         u32 link_mask; /* channel mask for the direction */
  48         u32 threshold; /* FIFO threshold */
  49 };
  50
  51 struct omap_mcpdm {
  52         struct device *dev;
  53         unsigned long phys_base;
  54         void __iomem *io_base;
  55         int irq;
  56
  57         struct mutex mutex;
  58
  59         /* Playback/Capture configuration */
  60         struct mcpdm_link_config config[2];
  61
  62         /* McPDM dn offsets for rx1, and 2 channels */
  63         u32 dn_rx_offset;
  64
  65         /* McPDM needs to be restarted due to runtime reconfiguration */
  66         bool restart;
  67
  68         struct snd_dmaengine_dai_dma_data dma_data[2];
  69         unsigned int dma_req[2];
  70 };
  71
  72 /*
  73  * Stream DMA parameters
  74  */
  75
  76 static inline void omap_mcpdm_write(struct omap_mcpdm *mcpdm, u16 reg, u32 val)
  77 {
  78         __raw_writel(val, mcpdm->io_base + reg);
  79 }
  80
  81 static inline int omap_mcpdm_read(struct omap_mcpdm *mcpdm, u16 reg)
  82 {
  83         return __raw_readl(mcpdm->io_base + reg);
  84 }
  85
  86 #ifdef DEBUG
  87 static void omap_mcpdm_reg_dump(struct omap_mcpdm *mcpdm)
  88 {
  89         dev_dbg(mcpdm->dev, "***********************\n");
  90         dev_dbg(mcpdm->dev, "IRQSTATUS_RAW:  0x%04x\n",
  91                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS_RAW));
  92         dev_dbg(mcpdm->dev, "IRQSTATUS:  0x%04x\n",
  93                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS));
  94         dev_dbg(mcpdm->dev, "IRQENABLE_SET:  0x%04x\n",
  95                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQENABLE_SET));
  96         dev_dbg(mcpdm->dev, "IRQENABLE_CLR:  0x%04x\n",
  97                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQENABLE_CLR));
  98         dev_dbg(mcpdm->dev, "IRQWAKE_EN: 0x%04x\n",
  99                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQWAKE_EN));
 100         dev_dbg(mcpdm->dev, "DMAENABLE_SET: 0x%04x\n",
 101                         omap_mcpdm_read(mcpdm, MCPDM_REG_DMAENABLE_SET));
 102         dev_dbg(mcpdm->dev, "DMAENABLE_CLR:  0x%04x\n",
 103                         omap_mcpdm_read(mcpdm, MCPDM_REG_DMAENABLE_CLR));
 104         dev_dbg(mcpdm->dev, "DMAWAKEEN:  0x%04x\n",
 105                         omap_mcpdm_read(mcpdm, MCPDM_REG_DMAWAKEEN));
 106         dev_dbg(mcpdm->dev, "CTRL:  0x%04x\n",
 107                         omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL));
 108         dev_dbg(mcpdm->dev, "DN_DATA:  0x%04x\n",
 109                         omap_mcpdm_read(mcpdm, MCPDM_REG_DN_DATA));
 110         dev_dbg(mcpdm->dev, "UP_DATA: 0x%04x\n",
 111                         omap_mcpdm_read(mcpdm, MCPDM_REG_UP_DATA));
 112         dev_dbg(mcpdm->dev, "FIFO_CTRL_DN: 0x%04x\n",
 113                         omap_mcpdm_read(mcpdm, MCPDM_REG_FIFO_CTRL_DN));
 114         dev_dbg(mcpdm->dev, "FIFO_CTRL_UP:  0x%04x\n",
 115                         omap_mcpdm_read(mcpdm, MCPDM_REG_FIFO_CTRL_UP));
 116         dev_dbg(mcpdm->dev, "***********************\n");
 117 }
 118 #else
 119 static void omap_mcpdm_reg_dump(struct omap_mcpdm *mcpdm) {}
 120 #endif
 121
 122 /*
 123  * Enables the transfer through the PDM interface to/from the Phoenix
 124  * codec by enabling the corresponding UP or DN channels.
 125  */
 126 static void omap_mcpdm_start(struct omap_mcpdm *mcpdm)
 127 {
 128         u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
 129         u32 link_mask = mcpdm->config[0].link_mask | mcpdm->config[1].link_mask;
 130
 131         ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
 132         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 133
 134         ctrl |= link_mask;
 135         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 136
 137         ctrl &= ~(MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
 138         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 139 }
 140
 141 /*
 142  * Disables the transfer through the PDM interface to/from the Phoenix
 143  * codec by disabling the corresponding UP or DN channels.
 144  */
 145 static void omap_mcpdm_stop(struct omap_mcpdm *mcpdm)
 146 {
 147         u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
 148         u32 link_mask = MCPDM_PDM_DN_MASK | MCPDM_PDM_UP_MASK;
 149
 150         ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
 151         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 152
 153         ctrl &= ~(link_mask);
 154         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 155
 156         ctrl &= ~(MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
 157         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 158
 159 }
 160
 161 /*
 162  * Is the physical McPDM interface active.
 163  */
 164 static inline int omap_mcpdm_active(struct omap_mcpdm *mcpdm)
 165 {
 166         return omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL) &
 167                                         (MCPDM_PDM_DN_MASK | MCPDM_PDM_UP_MASK);
 168 }
 169
 170 /*
 171  * Configures McPDM uplink, and downlink for audio.
 172  * This function should be called before omap_mcpdm_start.
 173  */
 174 static void omap_mcpdm_open_streams(struct omap_mcpdm *mcpdm)
 175 {
 176         omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_SET,
 177                         MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL |
 178                         MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL);
 179
 180         /* Enable DN RX1/2 offset cancellation feature, if configured */
 181         if (mcpdm->dn_rx_offset) {
 182                 u32 dn_offset = mcpdm->dn_rx_offset;
 183
 184                 omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset);
 185                 dn_offset |= (MCPDM_DN_OFST_RX1_EN | MCPDM_DN_OFST_RX2_EN);
 186                 omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset);
 187         }
 188
 189         omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_DN,
 190                          mcpdm->config[SNDRV_PCM_STREAM_PLAYBACK].threshold);
 191         omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_UP,
 192                          mcpdm->config[SNDRV_PCM_STREAM_CAPTURE].threshold);
 193
 194         omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_SET,
 195                         MCPDM_DMA_DN_ENABLE | MCPDM_DMA_UP_ENABLE);
 196 }
 197
 198 /*
 199  * Cleans McPDM uplink, and downlink configuration.
 200  * This function should be called when the stream is closed.
 201  */
 202 static void omap_mcpdm_close_streams(struct omap_mcpdm *mcpdm)
 203 {
 204         /* Disable irq request generation for downlink */
 205         omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_CLR,
 206                         MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL);
 207
 208         /* Disable DMA request generation for downlink */
 209         omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_CLR, MCPDM_DMA_DN_ENABLE);
 210
 211         /* Disable irq request generation for uplink */
 212         omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_CLR,
 213                         MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL);
 214
 215         /* Disable DMA request generation for uplink */
 216         omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_CLR, MCPDM_DMA_UP_ENABLE);
 217
 218         /* Disable RX1/2 offset cancellation */
 219         if (mcpdm->dn_rx_offset)
 220                 omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, 0);
 221 }
 222
 223 static irqreturn_t omap_mcpdm_irq_handler(int irq, void *dev_id)
 224 {
 225         struct omap_mcpdm *mcpdm = dev_id;
 226         int irq_status;
 227
 228         irq_status = omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS);
 229
 230         /* Acknowledge irq event */
 231         omap_mcpdm_write(mcpdm, MCPDM_REG_IRQSTATUS, irq_status);
 232
 233         if (irq_status & MCPDM_DN_IRQ_FULL)
 234                 dev_dbg(mcpdm->dev, "DN (playback) FIFO Full\n");
 235
 236         if (irq_status & MCPDM_DN_IRQ_EMPTY)
 237                 dev_dbg(mcpdm->dev, "DN (playback) FIFO Empty\n");
 238
 239         if (irq_status & MCPDM_DN_IRQ)
 240                 dev_dbg(mcpdm->dev, "DN (playback) write request\n");
 241
 242         if (irq_status & MCPDM_UP_IRQ_FULL)
 243                 dev_dbg(mcpdm->dev, "UP (capture) FIFO Full\n");
 244
 245         if (irq_status & MCPDM_UP_IRQ_EMPTY)
 246                 dev_dbg(mcpdm->dev, "UP (capture) FIFO Empty\n");
 247
 248         if (irq_status & MCPDM_UP_IRQ)
 249                 dev_dbg(mcpdm->dev, "UP (capture) write request\n");
 250
 251         return IRQ_HANDLED;
 252 }
 253
 254 static int omap_mcpdm_dai_startup(struct snd_pcm_substream *substream,
 255                                   struct snd_soc_dai *dai)
 256 {
 257         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 258
 259         mutex_lock(&mcpdm->mutex);
 260
 261         if (!dai->active) {
 262                 u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
 263
 264                 omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl | MCPDM_WD_EN);
 265                 omap_mcpdm_open_streams(mcpdm);
 266         }
 267         mutex_unlock(&mcpdm->mutex);
 268
 269         snd_soc_dai_set_dma_data(dai, substream,
 270                                  &mcpdm->dma_data[substream->stream]);
 271
 272         return 0;
 273 }
 274
 275 static void omap_mcpdm_dai_shutdown(struct snd_pcm_substream *substream,
 276                                   struct snd_soc_dai *dai)
 277 {
 278         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 279
 280         mutex_lock(&mcpdm->mutex);
 281
 282         if (!dai->active) {
 283                 if (omap_mcpdm_active(mcpdm)) {
 284                         omap_mcpdm_stop(mcpdm);
 285                         omap_mcpdm_close_streams(mcpdm);
 286                         mcpdm->config[0].link_mask = 0;
 287                         mcpdm->config[1].link_mask = 0;
 288                 }
 289         }
 290
 291         mutex_unlock(&mcpdm->mutex);
 292 }
 293
 294 static int omap_mcpdm_dai_hw_params(struct snd_pcm_substream *substream,
 295                                     struct snd_pcm_hw_params *params,
 296                                     struct snd_soc_dai *dai)
 297 {
 298         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 299         int stream = substream->stream;
 300         struct snd_dmaengine_dai_dma_data *dma_data;
 301         u32 threshold;
 302         int channels;
 303         int link_mask = 0;
 304
 305         channels = params_channels(params);
 306         switch (channels) {
 307         case 5:
 308                 if (stream == SNDRV_PCM_STREAM_CAPTURE)
 309                         /* up to 3 channels for capture */
 310                         return -EINVAL;
 311                 link_mask |= 1 << 4;
 312         case 4:
 313                 if (stream == SNDRV_PCM_STREAM_CAPTURE)
 314                         /* up to 3 channels for capture */
 315                         return -EINVAL;
 316                 link_mask |= 1 << 3;
 317         case 3:
 318                 link_mask |= 1 << 2;
 319         case 2:
 320                 link_mask |= 1 << 1;
 321         case 1:
 322                 link_mask |= 1 << 0;
 323                 break;
 324         default:
 325                 /* unsupported number of channels */
 326                 return -EINVAL;
 327         }
 328
 329         dma_data = snd_soc_dai_get_dma_data(dai, substream);
 330
 331         threshold = mcpdm->config[stream].threshold;
 332         /* Configure McPDM channels, and DMA packet size */
 333         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 334                 link_mask <<= 3;
 335
 336                 /* If capture is not running assume a stereo stream to come */
 337                 if (!mcpdm->config[!stream].link_mask)
 338                         mcpdm->config[!stream].link_mask = 0x3;
 339
 340                 dma_data->maxburst =
 341                                 (MCPDM_DN_THRES_MAX - threshold) * channels;
 342         } else {
 343                 /* If playback is not running assume a stereo stream to come */
 344                 if (!mcpdm->config[!stream].link_mask)
 345                         mcpdm->config[!stream].link_mask = (0x3 << 3);
 346
 347                 dma_data->maxburst = threshold * channels;
 348         }
 349
 350         /* Check if we need to restart McPDM with this stream */
 351         if (mcpdm->config[stream].link_mask &&
 352             mcpdm->config[stream].link_mask != link_mask)
 353                 mcpdm->restart = true;
 354
 355         mcpdm->config[stream].link_mask = link_mask;
 356
 357         return 0;
 358 }
 359
 360 static int omap_mcpdm_prepare(struct snd_pcm_substream *substream,
 361                                   struct snd_soc_dai *dai)
 362 {
 363         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 364
 365         if (!omap_mcpdm_active(mcpdm)) {
 366                 omap_mcpdm_start(mcpdm);
 367                 omap_mcpdm_reg_dump(mcpdm);
 368         } else if (mcpdm->restart) {
 369                 omap_mcpdm_stop(mcpdm);
 370                 omap_mcpdm_start(mcpdm);
 371                 mcpdm->restart = false;
 372                 omap_mcpdm_reg_dump(mcpdm);
 373         }
 374
 375         return 0;
 376 }
 377
 378 static const struct snd_soc_dai_ops omap_mcpdm_dai_ops = {
 379         .startup        = omap_mcpdm_dai_startup,
 380         .shutdown       = omap_mcpdm_dai_shutdown,
 381         .hw_params      = omap_mcpdm_dai_hw_params,
 382         .prepare        = omap_mcpdm_prepare,
 383 };
 384
 385 static int omap_mcpdm_probe(struct snd_soc_dai *dai)
 386 {
 387         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 388         int ret;
 389
 390         pm_runtime_enable(mcpdm->dev);
 391
 392         /* Disable lines while request is ongoing */
 393         pm_runtime_get_sync(mcpdm->dev);
 394         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, 0x00);
 395
 396         ret = devm_request_irq(mcpdm->dev, mcpdm->irq, omap_mcpdm_irq_handler,
 397                                 0, "McPDM", (void *)mcpdm);
 398
 399         pm_runtime_put_sync(mcpdm->dev);
 400
 401         if (ret) {
 402                 dev_err(mcpdm->dev, "Request for IRQ failed\n");
 403                 pm_runtime_disable(mcpdm->dev);
 404         }
 405
 406         /* Configure McPDM threshold values */
 407         mcpdm->config[SNDRV_PCM_STREAM_PLAYBACK].threshold = 2;
 408         mcpdm->config[SNDRV_PCM_STREAM_CAPTURE].threshold =
 409                                                         MCPDM_UP_THRES_MAX - 3;
 410         return ret;
 411 }
 412
 413 static int omap_mcpdm_remove(struct snd_soc_dai *dai)
 414 {
 415         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 416
 417         pm_runtime_disable(mcpdm->dev);
 418
 419         return 0;
 420 }
 421
 422 #define OMAP_MCPDM_RATES        (SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 423 #define OMAP_MCPDM_FORMATS      SNDRV_PCM_FMTBIT_S32_LE
 424
 425 static struct snd_soc_dai_driver omap_mcpdm_dai = {
 426         .probe = omap_mcpdm_probe,
 427         .remove = omap_mcpdm_remove,
 428         .probe_order = SND_SOC_COMP_ORDER_LATE,
 429         .remove_order = SND_SOC_COMP_ORDER_EARLY,
 430         .playback = {
 431                 .channels_min = 1,
 432                 .channels_max = 5,
 433                 .rates = OMAP_MCPDM_RATES,
 434                 .formats = OMAP_MCPDM_FORMATS,
 435                 .sig_bits = 24,
 436         },
 437         .capture = {
 438                 .channels_min = 1,
 439                 .channels_max = 3,
 440                 .rates = OMAP_MCPDM_RATES,
 441                 .formats = OMAP_MCPDM_FORMATS,
 442                 .sig_bits = 24,
 443         },
 444         .ops = &omap_mcpdm_dai_ops,
 445 };
 446
 447 static const struct snd_soc_component_driver omap_mcpdm_component = {
 448         .name           = "omap-mcpdm",
 449 };
 450
 451 void omap_mcpdm_configure_dn_offsets(struct snd_soc_pcm_runtime *rtd,
 452                                     u8 rx1, u8 rx2)
 453 {
 454         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(rtd->cpu_dai);
 455
 456         mcpdm->dn_rx_offset = MCPDM_DNOFST_RX1(rx1) | MCPDM_DNOFST_RX2(rx2);
 457 }
 458 EXPORT_SYMBOL_GPL(omap_mcpdm_configure_dn_offsets);
 459
 460 static int asoc_mcpdm_probe(struct platform_device *pdev)
 461 {
 462         struct omap_mcpdm *mcpdm;
 463         struct resource *res;
 464
 465         mcpdm = devm_kzalloc(&pdev->dev, sizeof(struct omap_mcpdm), GFP_KERNEL);
 466         if (!mcpdm)
 467                 return -ENOMEM;
 468
 469         platform_set_drvdata(pdev, mcpdm);
 470
 471         mutex_init(&mcpdm->mutex);
 472
 473         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
 474         if (res == NULL)
 475                 return -ENOMEM;
 476
 477         mcpdm->dma_data[0].addr = res->start + MCPDM_REG_DN_DATA;
 478         mcpdm->dma_data[1].addr = res->start + MCPDM_REG_UP_DATA;
 479
 480         res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "dn_link");
 481         if (!res)
 482                 return -ENODEV;
 483
 484         mcpdm->dma_req[0] = res->start;
 485         mcpdm->dma_data[0].filter_data = &mcpdm->dma_req[0];
 486
 487         res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "up_link");
 488         if (!res)
 489                 return -ENODEV;
 490
 491         mcpdm->dma_req[1] = res->start;
 492         mcpdm->dma_data[1].filter_data = &mcpdm->dma_req[1];
 493
 494         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
 495         if (res == NULL)
 496                 return -ENOMEM;
 497
 498         mcpdm->io_base = devm_ioremap_resource(&pdev->dev, res);
 499         if (IS_ERR(mcpdm->io_base))
 500                 return PTR_ERR(mcpdm->io_base);
 501
 502         mcpdm->irq = platform_get_irq(pdev, 0);
 503         if (mcpdm->irq < 0)
 504                 return mcpdm->irq;
 505
 506         mcpdm->dev = &pdev->dev;
 507
 508         return snd_soc_register_component(&pdev->dev, &omap_mcpdm_component,
 509                                           &omap_mcpdm_dai, 1);
 510 }
 511
 512 static int asoc_mcpdm_remove(struct platform_device *pdev)
 513 {
 514         snd_soc_unregister_component(&pdev->dev);
 515         return 0;
 516 }
 517
 518 static const struct of_device_id omap_mcpdm_of_match[] = {
 519         { .compatible = "ti,omap4-mcpdm", },
 520         { }
 521 };
 522 MODULE_DEVICE_TABLE(of, omap_mcpdm_of_match);
 523
 524 static struct platform_driver asoc_mcpdm_driver = {
 525         .driver = {
 526                 .name   = "omap-mcpdm",
 527                 .owner  = THIS_MODULE,
 528                 .of_match_table = omap_mcpdm_of_match,
 529         },
 530
 531         .probe  = asoc_mcpdm_probe,
 532         .remove = asoc_mcpdm_remove,
 533 };
 534
 535 module_platform_driver(asoc_mcpdm_driver);
 536
 537 MODULE_ALIAS("platform:omap-mcpdm");
 538 MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
 539 MODULE_DESCRIPTION("OMAP PDM SoC Interface");
 540 MODULE_LICENSE("GPL");