sound/soc/omap/omap-mcbsp.c

   1 /*
   2  * omap-mcbsp.c  --  OMAP ALSA SoC DAI driver using McBSP port
   3  *
   4  * Copyright (C) 2008 Nokia Corporation
   5  *
   6  * Contact: Jarkko Nikula <jarkko.nikula@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include <linux/init.h>
  25 #include <linux/module.h>
  26 #include <linux/device.h>
  27 #include <sound/core.h>
  28 #include <sound/pcm.h>
  29 #include <sound/pcm_params.h>
  30 #include <sound/initval.h>
  31 #include <sound/soc.h>
  32
  33 #include <mach/control.h>
  34 #include <mach/dma.h>
  35 #include <mach/mcbsp.h>
  36 #include "omap-mcbsp.h"
  37 #include "omap-pcm.h"
  38
  39 #define OMAP_MCBSP_RATES        (SNDRV_PCM_RATE_8000_96000)
  40
  41 struct omap_mcbsp_data {
  42         unsigned int                    bus_id;
  43         struct omap_mcbsp_reg_cfg       regs;
  44         unsigned int                    fmt;
  45         /*
  46          * Flags indicating is the bus already activated and configured by
  47          * another substream
  48          */
  49         int                             active;
  50         int                             configured;
  51 };
  52
  53 #define to_mcbsp(priv)  container_of((priv), struct omap_mcbsp_data, bus_id)
  54
  55 static struct omap_mcbsp_data mcbsp_data[NUM_LINKS];
  56
  57 /*
  58  * Stream DMA parameters. DMA request line and port address are set runtime
  59  * since they are different between OMAP1 and later OMAPs
  60  */
  61 static struct omap_pcm_dma_data omap_mcbsp_dai_dma_params[NUM_LINKS][2];
  62
  63 #if defined(CONFIG_ARCH_OMAP15XX) || defined(CONFIG_ARCH_OMAP16XX)
  64 static const int omap1_dma_reqs[][2] = {
  65         { OMAP_DMA_MCBSP1_TX, OMAP_DMA_MCBSP1_RX },
  66         { OMAP_DMA_MCBSP2_TX, OMAP_DMA_MCBSP2_RX },
  67         { OMAP_DMA_MCBSP3_TX, OMAP_DMA_MCBSP3_RX },
  68 };
  69 static const unsigned long omap1_mcbsp_port[][2] = {
  70         { OMAP1510_MCBSP1_BASE + OMAP_MCBSP_REG_DXR1,
  71           OMAP1510_MCBSP1_BASE + OMAP_MCBSP_REG_DRR1 },
  72         { OMAP1510_MCBSP2_BASE + OMAP_MCBSP_REG_DXR1,
  73           OMAP1510_MCBSP2_BASE + OMAP_MCBSP_REG_DRR1 },
  74         { OMAP1510_MCBSP3_BASE + OMAP_MCBSP_REG_DXR1,
  75           OMAP1510_MCBSP3_BASE + OMAP_MCBSP_REG_DRR1 },
  76 };
  77 #else
  78 static const int omap1_dma_reqs[][2] = {};
  79 static const unsigned long omap1_mcbsp_port[][2] = {};
  80 #endif
  81
  82 #if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
  83 static const int omap24xx_dma_reqs[][2] = {
  84         { OMAP24XX_DMA_MCBSP1_TX, OMAP24XX_DMA_MCBSP1_RX },
  85         { OMAP24XX_DMA_MCBSP2_TX, OMAP24XX_DMA_MCBSP2_RX },
  86 #if defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP34XX)
  87         { OMAP24XX_DMA_MCBSP3_TX, OMAP24XX_DMA_MCBSP3_RX },
  88         { OMAP24XX_DMA_MCBSP4_TX, OMAP24XX_DMA_MCBSP4_RX },
  89         { OMAP24XX_DMA_MCBSP5_TX, OMAP24XX_DMA_MCBSP5_RX },
  90 #endif
  91 };
  92 #else
  93 static const int omap24xx_dma_reqs[][2] = {};
  94 #endif
  95
  96 #if defined(CONFIG_ARCH_OMAP2420)
  97 static const unsigned long omap2420_mcbsp_port[][2] = {
  98         { OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR1,
  99           OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR1 },
 100         { OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR1,
 101           OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR1 },
 102 };
 103 #else
 104 static const unsigned long omap2420_mcbsp_port[][2] = {};
 105 #endif
 106
 107 #if defined(CONFIG_ARCH_OMAP2430)
 108 static const unsigned long omap2430_mcbsp_port[][2] = {
 109         { OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR,
 110           OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR },
 111         { OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR,
 112           OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR },
 113         { OMAP2430_MCBSP3_BASE + OMAP_MCBSP_REG_DXR,
 114           OMAP2430_MCBSP3_BASE + OMAP_MCBSP_REG_DRR },
 115         { OMAP2430_MCBSP4_BASE + OMAP_MCBSP_REG_DXR,
 116           OMAP2430_MCBSP4_BASE + OMAP_MCBSP_REG_DRR },
 117         { OMAP2430_MCBSP5_BASE + OMAP_MCBSP_REG_DXR,
 118           OMAP2430_MCBSP5_BASE + OMAP_MCBSP_REG_DRR },
 119 };
 120 #else
 121 static const unsigned long omap2430_mcbsp_port[][2] = {};
 122 #endif
 123
 124 #if defined(CONFIG_ARCH_OMAP34XX)
 125 static const unsigned long omap34xx_mcbsp_port[][2] = {
 126         { OMAP34XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR,
 127           OMAP34XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR },
 128         { OMAP34XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR,
 129           OMAP34XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR },
 130         { OMAP34XX_MCBSP3_BASE + OMAP_MCBSP_REG_DXR,
 131           OMAP34XX_MCBSP3_BASE + OMAP_MCBSP_REG_DRR },
 132         { OMAP34XX_MCBSP4_BASE + OMAP_MCBSP_REG_DXR,
 133           OMAP34XX_MCBSP4_BASE + OMAP_MCBSP_REG_DRR },
 134         { OMAP34XX_MCBSP5_BASE + OMAP_MCBSP_REG_DXR,
 135           OMAP34XX_MCBSP5_BASE + OMAP_MCBSP_REG_DRR },
 136 };
 137 #else
 138 static const unsigned long omap34xx_mcbsp_port[][2] = {};
 139 #endif
 140
 141 static int omap_mcbsp_dai_startup(struct snd_pcm_substream *substream,
 142                                   struct snd_soc_dai *dai)
 143 {
 144         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 145         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 146         struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 147         int err = 0;
 148
 149         if (cpu_is_omap343x() && mcbsp_data->bus_id == 1) {
 150                 /*
 151                  * McBSP2 in OMAP3 has 1024 * 32-bit internal audio buffer.
 152                  * Set constraint for minimum buffer size to the same than FIFO
 153                  * size in order to avoid underruns in playback startup because
 154                  * HW is keeping the DMA request active until FIFO is filled.
 155                  */
 156                 snd_pcm_hw_constraint_minmax(substream->runtime,
 157                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 4096, UINT_MAX);
 158         }
 159
 160         if (!cpu_dai->active)
 161                 err = omap_mcbsp_request(mcbsp_data->bus_id);
 162
 163         return err;
 164 }
 165
 166 static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream,
 167                                     struct snd_soc_dai *dai)
 168 {
 169         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 170         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 171         struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 172
 173         if (!cpu_dai->active) {
 174                 omap_mcbsp_free(mcbsp_data->bus_id);
 175                 mcbsp_data->configured = 0;
 176         }
 177 }
 178
 179 static int omap_mcbsp_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 180                                   struct snd_soc_dai *dai)
 181 {
 182         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 183         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 184         struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 185         int err = 0;
 186
 187         switch (cmd) {
 188         case SNDRV_PCM_TRIGGER_START:
 189         case SNDRV_PCM_TRIGGER_RESUME:
 190         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 191                 if (!mcbsp_data->active++)
 192                         omap_mcbsp_start(mcbsp_data->bus_id);
 193                 break;
 194
 195         case SNDRV_PCM_TRIGGER_STOP:
 196         case SNDRV_PCM_TRIGGER_SUSPEND:
 197         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 198                 if (!--mcbsp_data->active)
 199                         omap_mcbsp_stop(mcbsp_data->bus_id);
 200                 break;
 201         default:
 202                 err = -EINVAL;
 203         }
 204
 205         return err;
 206 }
 207
 208 static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
 209                                     struct snd_pcm_hw_params *params,
 210                                     struct snd_soc_dai *dai)
 211 {
 212         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 213         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 214         struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 215         struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
 216         int dma, bus_id = mcbsp_data->bus_id, id = cpu_dai->id;
 217         int wlen, channels;
 218         unsigned long port;
 219
 220         if (cpu_class_is_omap1()) {
 221                 dma = omap1_dma_reqs[bus_id][substream->stream];
 222                 port = omap1_mcbsp_port[bus_id][substream->stream];
 223         } else if (cpu_is_omap2420()) {
 224                 dma = omap24xx_dma_reqs[bus_id][substream->stream];
 225                 port = omap2420_mcbsp_port[bus_id][substream->stream];
 226         } else if (cpu_is_omap2430()) {
 227                 dma = omap24xx_dma_reqs[bus_id][substream->stream];
 228                 port = omap2430_mcbsp_port[bus_id][substream->stream];
 229         } else if (cpu_is_omap343x()) {
 230                 dma = omap24xx_dma_reqs[bus_id][substream->stream];
 231                 port = omap34xx_mcbsp_port[bus_id][substream->stream];
 232         } else {
 233                 return -ENODEV;
 234         }
 235         omap_mcbsp_dai_dma_params[id][substream->stream].name =
 236                 substream->stream ? "Audio Capture" : "Audio Playback";
 237         omap_mcbsp_dai_dma_params[id][substream->stream].dma_req = dma;
 238         omap_mcbsp_dai_dma_params[id][substream->stream].port_addr = port;
 239         cpu_dai->dma_data = &omap_mcbsp_dai_dma_params[id][substream->stream];
 240
 241         if (mcbsp_data->configured) {
 242                 /* McBSP already configured by another stream */
 243                 return 0;
 244         }
 245
 246         channels = params_channels(params);
 247         switch (channels) {
 248         case 2:
 249                 /* Use dual-phase frames */
 250                 regs->rcr2      |= RPHASE;
 251                 regs->xcr2      |= XPHASE;
 252         case 1:
 253                 /* Set 1 word per (McBSP) frame */
 254                 regs->rcr2      |= RFRLEN2(1 - 1);
 255                 regs->rcr1      |= RFRLEN1(1 - 1);
 256                 regs->xcr2      |= XFRLEN2(1 - 1);
 257                 regs->xcr1      |= XFRLEN1(1 - 1);
 258                 break;
 259         default:
 260                 /* Unsupported number of channels */
 261                 return -EINVAL;
 262         }
 263
 264         switch (params_format(params)) {
 265         case SNDRV_PCM_FORMAT_S16_LE:
 266                 /* Set word lengths */
 267                 wlen = 16;
 268                 regs->rcr2      |= RWDLEN2(OMAP_MCBSP_WORD_16);
 269                 regs->rcr1      |= RWDLEN1(OMAP_MCBSP_WORD_16);
 270                 regs->xcr2      |= XWDLEN2(OMAP_MCBSP_WORD_16);
 271                 regs->xcr1      |= XWDLEN1(OMAP_MCBSP_WORD_16);
 272                 break;
 273         default:
 274                 /* Unsupported PCM format */
 275                 return -EINVAL;
 276         }
 277
 278         /* Set FS period and length in terms of bit clock periods */
 279         switch (mcbsp_data->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 280         case SND_SOC_DAIFMT_I2S:
 281                 regs->srgr2     |= FPER(wlen * 2 - 1);
 282                 regs->srgr1     |= FWID(wlen - 1);
 283                 break;
 284         case SND_SOC_DAIFMT_DSP_B:
 285                 regs->srgr2     |= FPER(wlen * channels - 1);
 286                 regs->srgr1     |= FWID(wlen * channels - 2);
 287                 break;
 288         }
 289
 290         omap_mcbsp_config(bus_id, &mcbsp_data->regs);
 291         mcbsp_data->configured = 1;
 292
 293         return 0;
 294 }
 295
 296 /*
 297  * This must be called before _set_clkdiv and _set_sysclk since McBSP register
 298  * cache is initialized here
 299  */
 300 static int omap_mcbsp_dai_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 301                                       unsigned int fmt)
 302 {
 303         struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 304         struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
 305
 306         if (mcbsp_data->configured)
 307                 return 0;
 308
 309         mcbsp_data->fmt = fmt;
 310         memset(regs, 0, sizeof(*regs));
 311         /* Generic McBSP register settings */
 312         regs->spcr2     |= XINTM(3) | FREE;
 313         regs->spcr1     |= RINTM(3);
 314         regs->rcr2      |= RFIG;
 315         regs->xcr2      |= XFIG;
 316         if (cpu_is_omap2430() || cpu_is_omap34xx()) {
 317                 regs->xccr = DXENDLY(1) | XDMAEN;
 318                 regs->rccr = RFULL_CYCLE | RDMAEN;
 319         }
 320
 321         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 322         case SND_SOC_DAIFMT_I2S:
 323                 /* 1-bit data delay */
 324                 regs->rcr2      |= RDATDLY(1);
 325                 regs->xcr2      |= XDATDLY(1);
 326                 break;
 327         case SND_SOC_DAIFMT_DSP_B:
 328                 /* 0-bit data delay */
 329                 regs->rcr2      |= RDATDLY(0);
 330                 regs->xcr2      |= XDATDLY(0);
 331                 break;
 332         default:
 333                 /* Unsupported data format */
 334                 return -EINVAL;
 335         }
 336
 337         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 338         case SND_SOC_DAIFMT_CBS_CFS:
 339                 /* McBSP master. Set FS and bit clocks as outputs */
 340                 regs->pcr0      |= FSXM | FSRM |
 341                                    CLKXM | CLKRM;
 342                 /* Sample rate generator drives the FS */
 343                 regs->srgr2     |= FSGM;
 344                 break;
 345         case SND_SOC_DAIFMT_CBM_CFM:
 346                 /* McBSP slave */
 347                 break;
 348         default:
 349                 /* Unsupported master/slave configuration */
 350                 return -EINVAL;
 351         }
 352
 353         /* Set bit clock (CLKX/CLKR) and FS polarities */
 354         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 355         case SND_SOC_DAIFMT_NB_NF:
 356                 /*
 357                  * Normal BCLK + FS.
 358                  * FS active low. TX data driven on falling edge of bit clock
 359                  * and RX data sampled on rising edge of bit clock.
 360                  */
 361                 regs->pcr0      |= FSXP | FSRP |
 362                                    CLKXP | CLKRP;
 363                 break;
 364         case SND_SOC_DAIFMT_NB_IF:
 365                 regs->pcr0      |= CLKXP | CLKRP;
 366                 break;
 367         case SND_SOC_DAIFMT_IB_NF:
 368                 regs->pcr0      |= FSXP | FSRP;
 369                 break;
 370         case SND_SOC_DAIFMT_IB_IF:
 371                 break;
 372         default:
 373                 return -EINVAL;
 374         }
 375
 376         return 0;
 377 }
 378
 379 static int omap_mcbsp_dai_set_clkdiv(struct snd_soc_dai *cpu_dai,
 380                                      int div_id, int div)
 381 {
 382         struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 383         struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
 384
 385         if (div_id != OMAP_MCBSP_CLKGDV)
 386                 return -ENODEV;
 387
 388         regs->srgr1     |= CLKGDV(div - 1);
 389
 390         return 0;
 391 }
 392
 393 static int omap_mcbsp_dai_set_clks_src(struct omap_mcbsp_data *mcbsp_data,
 394                                        int clk_id)
 395 {
 396         int sel_bit;
 397         u16 reg, reg_devconf1 = OMAP243X_CONTROL_DEVCONF1;
 398
 399         if (cpu_class_is_omap1()) {
 400                 /* OMAP1's can use only external source clock */
 401                 if (unlikely(clk_id == OMAP_MCBSP_SYSCLK_CLKS_FCLK))
 402                         return -EINVAL;
 403                 else
 404                         return 0;
 405         }
 406
 407         if (cpu_is_omap2420() && mcbsp_data->bus_id > 1)
 408                 return -EINVAL;
 409
 410         if (cpu_is_omap343x())
 411                 reg_devconf1 = OMAP343X_CONTROL_DEVCONF1;
 412
 413         switch (mcbsp_data->bus_id) {
 414         case 0:
 415                 reg = OMAP2_CONTROL_DEVCONF0;
 416                 sel_bit = 2;
 417                 break;
 418         case 1:
 419                 reg = OMAP2_CONTROL_DEVCONF0;
 420                 sel_bit = 6;
 421                 break;
 422         case 2:
 423                 reg = reg_devconf1;
 424                 sel_bit = 0;
 425                 break;
 426         case 3:
 427                 reg = reg_devconf1;
 428                 sel_bit = 2;
 429                 break;
 430         case 4:
 431                 reg = reg_devconf1;
 432                 sel_bit = 4;
 433                 break;
 434         default:
 435                 return -EINVAL;
 436         }
 437
 438         if (clk_id == OMAP_MCBSP_SYSCLK_CLKS_FCLK)
 439                 omap_ctrl_writel(omap_ctrl_readl(reg) & ~(1 << sel_bit), reg);
 440         else
 441                 omap_ctrl_writel(omap_ctrl_readl(reg) | (1 << sel_bit), reg);
 442
 443         return 0;
 444 }
 445
 446 static int omap_mcbsp_dai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
 447                                          int clk_id, unsigned int freq,
 448                                          int dir)
 449 {
 450         struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 451         struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
 452         int err = 0;
 453
 454         switch (clk_id) {
 455         case OMAP_MCBSP_SYSCLK_CLK:
 456                 regs->srgr2     |= CLKSM;
 457                 break;
 458         case OMAP_MCBSP_SYSCLK_CLKS_FCLK:
 459         case OMAP_MCBSP_SYSCLK_CLKS_EXT:
 460                 err = omap_mcbsp_dai_set_clks_src(mcbsp_data, clk_id);
 461                 break;
 462
 463         case OMAP_MCBSP_SYSCLK_CLKX_EXT:
 464                 regs->srgr2     |= CLKSM;
 465         case OMAP_MCBSP_SYSCLK_CLKR_EXT:
 466                 regs->pcr0      |= SCLKME;
 467                 break;
 468         default:
 469                 err = -ENODEV;
 470         }
 471
 472         return err;
 473 }
 474
 475 static struct snd_soc_dai_ops omap_mcbsp_dai_ops = {
 476         .startup        = omap_mcbsp_dai_startup,
 477         .shutdown       = omap_mcbsp_dai_shutdown,
 478         .trigger        = omap_mcbsp_dai_trigger,
 479         .hw_params      = omap_mcbsp_dai_hw_params,
 480         .set_fmt        = omap_mcbsp_dai_set_dai_fmt,
 481         .set_clkdiv     = omap_mcbsp_dai_set_clkdiv,
 482         .set_sysclk     = omap_mcbsp_dai_set_dai_sysclk,
 483 };
 484
 485 #define OMAP_MCBSP_DAI_BUILDER(link_id)                         \
 486 {                                                               \
 487         .name = "omap-mcbsp-dai-"#link_id,                      \
 488         .id = (link_id),                                        \
 489         .playback = {                                           \
 490                 .channels_min = 1,                              \
 491                 .channels_max = 2,                              \
 492                 .rates = OMAP_MCBSP_RATES,                      \
 493                 .formats = SNDRV_PCM_FMTBIT_S16_LE,             \
 494         },                                                      \
 495         .capture = {                                            \
 496                 .channels_min = 1,                              \
 497                 .channels_max = 2,                              \
 498                 .rates = OMAP_MCBSP_RATES,                      \
 499                 .formats = SNDRV_PCM_FMTBIT_S16_LE,             \
 500         },                                                      \
 501         .ops = &omap_mcbsp_dai_ops,                             \
 502         .private_data = &mcbsp_data[(link_id)].bus_id,          \
 503 }
 504
 505 struct snd_soc_dai omap_mcbsp_dai[] = {
 506         OMAP_MCBSP_DAI_BUILDER(0),
 507         OMAP_MCBSP_DAI_BUILDER(1),
 508 #if NUM_LINKS >= 3
 509         OMAP_MCBSP_DAI_BUILDER(2),
 510 #endif
 511 #if NUM_LINKS == 5
 512         OMAP_MCBSP_DAI_BUILDER(3),
 513         OMAP_MCBSP_DAI_BUILDER(4),
 514 #endif
 515 };
 516
 517 EXPORT_SYMBOL_GPL(omap_mcbsp_dai);
 518
 519 static int __init snd_omap_mcbsp_init(void)
 520 {
 521         return snd_soc_register_dais(omap_mcbsp_dai,
 522                                      ARRAY_SIZE(omap_mcbsp_dai));
 523 }
 524 module_init(snd_omap_mcbsp_init);
 525
 526 static void __exit snd_omap_mcbsp_exit(void)
 527 {
 528         snd_soc_unregister_dais(omap_mcbsp_dai, ARRAY_SIZE(omap_mcbsp_dai));
 529 }
 530 module_exit(snd_omap_mcbsp_exit);
 531
 532 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@nokia.com>");
 533 MODULE_DESCRIPTION("OMAP I2S SoC Interface");
 534 MODULE_LICENSE("GPL");