sound/soc/omap/omap3evm.c

   1 /*
   2  * omap3evm.c  -- ALSA SoC support for OMAP3 EVM
   3  *
   4  * Author: Anuj Aggarwal <anuj.aggarwal@ti.com>
   5  *
   6  * Based on sound/soc/omap/beagle.c by Steve Sakoman
   7  *
   8  * Copyright (C) 2008 Texas Instruments, Incorporated
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the
  12  * Free Software Foundation version 2.
  13  *
  14  * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
  15  * whether express or implied; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17  * General Public License for more details.
  18  */
  19
  20 #include <linux/clk.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/module.h>
  23 #include <sound/core.h>
  24 #include <sound/pcm.h>
  25 #include <sound/soc.h>
  26
  27 #include <asm/mach-types.h>
  28 #include <mach/hardware.h>
  29 #include <mach/gpio.h>
  30 #include <plat/mcbsp.h>
  31
  32 #include "omap-mcbsp.h"
  33 #include "omap-pcm.h"
  34
  35 static int omap3evm_hw_params(struct snd_pcm_substream *substream,
  36         struct snd_pcm_hw_params *params)
  37 {
  38         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  39         struct snd_soc_dai *codec_dai = rtd->codec_dai;
  40         int ret;
  41
  42         /* Set the codec system clock for DAC and ADC */
  43         ret = snd_soc_dai_set_sysclk(codec_dai, 0, 26000000,
  44                                      SND_SOC_CLOCK_IN);
  45         if (ret < 0) {
  46                 printk(KERN_ERR "Can't set codec system clock\n");
  47                 return ret;
  48         }
  49
  50         return 0;
  51 }
  52
  53 static struct snd_soc_ops omap3evm_ops = {
  54         .hw_params = omap3evm_hw_params,
  55 };
  56
  57 /* Digital audio interface glue - connects codec <--> CPU */
  58 static struct snd_soc_dai_link omap3evm_dai = {
  59         .name           = "TWL4030",
  60         .stream_name    = "TWL4030",
  61         .cpu_dai_name = "omap-mcbsp.2",
  62         .codec_dai_name = "twl4030-hifi",
  63         .platform_name = "omap-pcm-audio",
  64         .codec_name = "twl4030-codec",
  65         .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
  66                    SND_SOC_DAIFMT_CBM_CFM,
  67         .ops            = &omap3evm_ops,
  68 };
  69
  70 /* Audio machine driver */
  71 static struct snd_soc_card snd_soc_omap3evm = {
  72         .name = "omap3evm",
  73         .owner = THIS_MODULE,
  74         .dai_link = &omap3evm_dai,
  75         .num_links = 1,
  76 };
  77
  78 static struct platform_device *omap3evm_snd_device;
  79
  80 static int __init omap3evm_soc_init(void)
  81 {
  82         int ret;
  83
  84         if (!machine_is_omap3evm())
  85                 return -ENODEV;
  86         pr_info("OMAP3 EVM SoC init\n");
  87
  88         omap3evm_snd_device = platform_device_alloc("soc-audio", -1);
  89         if (!omap3evm_snd_device) {
  90                 printk(KERN_ERR "Platform device allocation failed\n");
  91                 return -ENOMEM;
  92         }
  93
  94         platform_set_drvdata(omap3evm_snd_device, &snd_soc_omap3evm);
  95         ret = platform_device_add(omap3evm_snd_device);
  96         if (ret)
  97                 goto err1;
  98
  99         return 0;
 100
 101 err1:
 102         printk(KERN_ERR "Unable to add platform device\n");
 103         platform_device_put(omap3evm_snd_device);
 104
 105         return ret;
 106 }
 107
 108 static void __exit omap3evm_soc_exit(void)
 109 {
 110         platform_device_unregister(omap3evm_snd_device);
 111 }
 112
 113 module_init(omap3evm_soc_init);
 114 module_exit(omap3evm_soc_exit);
 115
 116 MODULE_AUTHOR("Anuj Aggarwal <anuj.aggarwal@ti.com>");
 117 MODULE_DESCRIPTION("ALSA SoC OMAP3 EVM");
 118 MODULE_LICENSE("GPL v2");