LXR linux/sound/soc/omap/omap3beagle.c

   1/*
   2 * omap3beagle.c  --  SoC audio for OMAP3 Beagle
   3 *
   4 * Author: Steve Sakoman <steve@sakoman.com>
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * version 2 as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful, but
  11 * WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 * General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  18 * 02110-1301 USA
  19 *
  20 */
  21
  22#include <linux/clk.h>
  23#include <linux/platform_device.h>
  24#include <sound/core.h>
  25#include <sound/pcm.h>
  26#include <sound/soc.h>
  27#include <sound/soc-dapm.h>
  28
  29#include <asm/mach-types.h>
  30#include <mach/hardware.h>
  31#include <mach/gpio.h>
  32#include <mach/mcbsp.h>
  33
  34#include "omap-mcbsp.h"
  35#include "omap-pcm.h"
  36#include "../codecs/twl4030.h"
  37
  38static int omap3beagle_hw_params(struct snd_pcm_substream *substream,
  39        struct snd_pcm_hw_params *params)
  40{
  41        struct snd_soc_pcm_runtime *rtd = substream->private_data;
  42        struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
  43        struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
  44        unsigned int fmt;
  45        int ret;
  46
  47        switch (params_channels(params)) {
  48        case 2: /* Stereo I2S mode */
  49                fmt =   SND_SOC_DAIFMT_I2S |
  50                        SND_SOC_DAIFMT_NB_NF |
  51                        SND_SOC_DAIFMT_CBM_CFM;
  52                break;
  53        case 4: /* Four channel TDM mode */
  54                fmt =   SND_SOC_DAIFMT_DSP_A |
  55                        SND_SOC_DAIFMT_IB_NF |
  56                        SND_SOC_DAIFMT_CBM_CFM;
  57                break;
  58        default:
  59                return -EINVAL;
  60        }
  61
  62        /* Set codec DAI configuration */
  63        ret = snd_soc_dai_set_fmt(codec_dai, fmt);
  64        if (ret < 0) {
  65                printk(KERN_ERR "can't set codec DAI configuration\n");
  66                return ret;
  67        }
  68
  69        /* Set cpu DAI configuration */
  70        ret = snd_soc_dai_set_fmt(cpu_dai, fmt);
  71        if (ret < 0) {
  72                printk(KERN_ERR "can't set cpu DAI configuration\n");
  73                return ret;
  74        }
  75
  76        /* Set the codec system clock for DAC and ADC */
  77        ret = snd_soc_dai_set_sysclk(codec_dai, 0, 26000000,
  78                                     SND_SOC_CLOCK_IN);
  79        if (ret < 0) {
  80                printk(KERN_ERR "can't set codec system clock\n");
  81                return ret;
  82        }
  83
  84        return 0;
  85}
  86
  87static struct snd_soc_ops omap3beagle_ops = {
  88        .hw_params = omap3beagle_hw_params,
  89};
  90
  91/* Digital audio interface glue - connects codec <--> CPU */
  92static struct snd_soc_dai_link omap3beagle_dai = {
  93        .name = "TWL4030",
  94        .stream_name = "TWL4030",
  95        .cpu_dai = &omap_mcbsp_dai[0],
  96        .codec_dai = &twl4030_dai[TWL4030_DAI_HIFI],
  97        .ops = &omap3beagle_ops,
  98};
  99
 100/* Audio machine driver */
 101static struct snd_soc_card snd_soc_omap3beagle = {
 102        .name = "omap3beagle",
 103        .platform = &omap_soc_platform,
 104        .dai_link = &omap3beagle_dai,
 105        .num_links = 1,
 106};
 107
 108/* Audio subsystem */
 109static struct snd_soc_device omap3beagle_snd_devdata = {
 110        .card = &snd_soc_omap3beagle,
 111        .codec_dev = &soc_codec_dev_twl4030,
 112};
 113
 114static struct platform_device *omap3beagle_snd_device;
 115
 116static int __init omap3beagle_soc_init(void)
 117{
 118        int ret;
 119
 120        if (!machine_is_omap3_beagle()) {
 121                pr_debug("Not OMAP3 Beagle!\n");
 122                return -ENODEV;
 123        }
 124        pr_info("OMAP3 Beagle SoC init\n");
 125
 126        omap3beagle_snd_device = platform_device_alloc("soc-audio", -1);
 127        if (!omap3beagle_snd_device) {
 128                printk(KERN_ERR "Platform device allocation failed\n");
 129                return -ENOMEM;
 130        }
 131
 132        platform_set_drvdata(omap3beagle_snd_device, &omap3beagle_snd_devdata);
 133        omap3beagle_snd_devdata.dev = &omap3beagle_snd_device->dev;
 134        *(unsigned int *)omap3beagle_dai.cpu_dai->private_data = 1; /* McBSP2 */
 135
 136        ret = platform_device_add(omap3beagle_snd_device);
 137        if (ret)
 138                goto err1;
 139
 140        return 0;
 141
 142err1:
 143        printk(KERN_ERR "Unable to add platform device\n");
 144        platform_device_put(omap3beagle_snd_device);
 145
 146        return ret;
 147}
 148
 149static void __exit omap3beagle_soc_exit(void)
 150{
 151        platform_device_unregister(omap3beagle_snd_device);
 152}
 153
 154module_init(omap3beagle_soc_init);
 155module_exit(omap3beagle_soc_exit);
 156
 157MODULE_AUTHOR("Steve Sakoman <steve@sakoman.com>");
 158MODULE_DESCRIPTION("ALSA SoC OMAP3 Beagle");
 159MODULE_LICENSE("GPL");
 160