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 <linux/module.h>
  25 #include <sound/core.h>
  26 #include <sound/pcm.h>
  27 #include <sound/soc.h>
  28
  29 #include <asm/mach-types.h>
  30 #include <mach/hardware.h>
  31 #include <mach/gpio.h>
  32 #include <plat/mcbsp.h>
  33
  34 #include "omap-mcbsp.h"
  35 #include "omap-pcm.h"
  36
  37 static int omap3beagle_hw_params(struct snd_pcm_substream *substream,
  38         struct snd_pcm_hw_params *params)
  39 {
  40         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  41         struct snd_soc_dai *codec_dai = rtd->codec_dai;
  42         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  43         unsigned int fmt;
  44         int ret;
  45
  46         switch (params_channels(params)) {
  47         case 2: /* Stereo I2S mode */
  48                 fmt =   SND_SOC_DAIFMT_I2S |
  49                         SND_SOC_DAIFMT_NB_NF |
  50                         SND_SOC_DAIFMT_CBM_CFM;
  51                 break;
  52         case 4: /* Four channel TDM mode */
  53                 fmt =   SND_SOC_DAIFMT_DSP_A |
  54                         SND_SOC_DAIFMT_IB_NF |
  55                         SND_SOC_DAIFMT_CBM_CFM;
  56                 break;
  57         default:
  58                 return -EINVAL;
  59         }
  60
  61         /* Set codec DAI configuration */
  62         ret = snd_soc_dai_set_fmt(codec_dai, fmt);
  63         if (ret < 0) {
  64                 printk(KERN_ERR "can't set codec DAI configuration\n");
  65                 return ret;
  66         }
  67
  68         /* Set cpu DAI configuration */
  69         ret = snd_soc_dai_set_fmt(cpu_dai, fmt);
  70         if (ret < 0) {
  71                 printk(KERN_ERR "can't set cpu DAI configuration\n");
  72                 return ret;
  73         }
  74
  75         /* Set the codec system clock for DAC and ADC */
  76         ret = snd_soc_dai_set_sysclk(codec_dai, 0, 26000000,
  77                                      SND_SOC_CLOCK_IN);
  78         if (ret < 0) {
  79                 printk(KERN_ERR "can't set codec system clock\n");
  80                 return ret;
  81         }
  82
  83         return 0;
  84 }
  85
  86 static struct snd_soc_ops omap3beagle_ops = {
  87         .hw_params = omap3beagle_hw_params,
  88 };
  89
  90 /* Digital audio interface glue - connects codec <--> CPU */
  91 static struct snd_soc_dai_link omap3beagle_dai = {
  92         .name = "TWL4030",
  93         .stream_name = "TWL4030",
  94         .cpu_dai_name = "omap-mcbsp-dai.1",
  95         .platform_name = "omap-pcm-audio",
  96         .codec_dai_name = "twl4030-hifi",
  97         .codec_name = "twl4030-codec",
  98         .ops = &omap3beagle_ops,
  99 };
 100
 101 /* Audio machine driver */
 102 static struct snd_soc_card snd_soc_omap3beagle = {
 103         .name = "omap3beagle",
 104         .owner = THIS_MODULE,
 105         .dai_link = &omap3beagle_dai,
 106         .num_links = 1,
 107 };
 108
 109 static struct platform_device *omap3beagle_snd_device;
 110
 111 static int __init omap3beagle_soc_init(void)
 112 {
 113         int ret;
 114
 115         if (!(machine_is_omap3_beagle() || machine_is_devkit8000()))
 116                 return -ENODEV;
 117         pr_info("OMAP3 Beagle/Devkit8000 SoC init\n");
 118
 119         omap3beagle_snd_device = platform_device_alloc("soc-audio", -1);
 120         if (!omap3beagle_snd_device) {
 121                 printk(KERN_ERR "Platform device allocation failed\n");
 122                 return -ENOMEM;
 123         }
 124
 125         platform_set_drvdata(omap3beagle_snd_device, &snd_soc_omap3beagle);
 126
 127         ret = platform_device_add(omap3beagle_snd_device);
 128         if (ret)
 129                 goto err1;
 130
 131         return 0;
 132
 133 err1:
 134         printk(KERN_ERR "Unable to add platform device\n");
 135         platform_device_put(omap3beagle_snd_device);
 136
 137         return ret;
 138 }
 139
 140 static void __exit omap3beagle_soc_exit(void)
 141 {
 142         platform_device_unregister(omap3beagle_snd_device);
 143 }
 144
 145 module_init(omap3beagle_soc_init);
 146 module_exit(omap3beagle_soc_exit);
 147
 148 MODULE_AUTHOR("Steve Sakoman <steve@sakoman.com>");
 149 MODULE_DESCRIPTION("ALSA SoC OMAP3 Beagle");
 150 MODULE_LICENSE("GPL");