sound/soc/omap/omap2evm.c

   1 /*
   2  * omap2evm.c  --  SoC audio machine driver for omap2evm board
   3  *
   4  * Author: Arun KS <arunks@mistralsolutions.com>
   5  *
   6  * Based on sound/soc/omap/overo.c by Steve Sakoman
   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/clk.h>
  25 #include <linux/platform_device.h>
  26 #include <sound/core.h>
  27 #include <sound/pcm.h>
  28 #include <sound/soc.h>
  29
  30 #include <asm/mach-types.h>
  31 #include <mach/hardware.h>
  32 #include <mach/gpio.h>
  33 #include <plat/mcbsp.h>
  34
  35 #include "omap-mcbsp.h"
  36 #include "omap-pcm.h"
  37
  38 static int omap2evm_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->codec_dai;
  43         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  44         int ret;
  45
  46         /* Set codec DAI configuration */
  47         ret = snd_soc_dai_set_fmt(codec_dai,
  48                                   SND_SOC_DAIFMT_I2S |
  49                                   SND_SOC_DAIFMT_NB_NF |
  50                                   SND_SOC_DAIFMT_CBM_CFM);
  51         if (ret < 0) {
  52                 printk(KERN_ERR "can't set codec DAI configuration\n");
  53                 return ret;
  54         }
  55
  56         /* Set cpu DAI configuration */
  57         ret = snd_soc_dai_set_fmt(cpu_dai,
  58                                   SND_SOC_DAIFMT_I2S |
  59                                   SND_SOC_DAIFMT_NB_NF |
  60                                   SND_SOC_DAIFMT_CBM_CFM);
  61         if (ret < 0) {
  62                 printk(KERN_ERR "can't set cpu DAI configuration\n");
  63                 return ret;
  64         }
  65
  66         /* Set the codec system clock for DAC and ADC */
  67         ret = snd_soc_dai_set_sysclk(codec_dai, 0, 26000000,
  68                                             SND_SOC_CLOCK_IN);
  69         if (ret < 0) {
  70                 printk(KERN_ERR "can't set codec system clock\n");
  71                 return ret;
  72         }
  73
  74         return 0;
  75 }
  76
  77 static struct snd_soc_ops omap2evm_ops = {
  78         .hw_params = omap2evm_hw_params,
  79 };
  80
  81 /* Digital audio interface glue - connects codec <--> CPU */
  82 static struct snd_soc_dai_link omap2evm_dai = {
  83         .name = "TWL4030",
  84         .stream_name = "TWL4030",
  85         .cpu_dai_name = "omap-mcbsp-dai.1",
  86         .codec_dai_name = "twl4030-hifi",
  87         .platform_name = "omap-pcm-audio",
  88         .codec_name = "twl4030-codec",
  89         .ops = &omap2evm_ops,
  90 };
  91
  92 /* Audio machine driver */
  93 static struct snd_soc_card snd_soc_omap2evm = {
  94         .name = "omap2evm",
  95         .dai_link = &omap2evm_dai,
  96         .num_links = 1,
  97 };
  98
  99 static struct platform_device *omap2evm_snd_device;
 100
 101 static int __init omap2evm_soc_init(void)
 102 {
 103         int ret;
 104
 105         if (!machine_is_omap2evm())
 106                 return -ENODEV;
 107         printk(KERN_INFO "omap2evm SoC init\n");
 108
 109         omap2evm_snd_device = platform_device_alloc("soc-audio", -1);
 110         if (!omap2evm_snd_device) {
 111                 printk(KERN_ERR "Platform device allocation failed\n");
 112                 return -ENOMEM;
 113         }
 114
 115         platform_set_drvdata(omap2evm_snd_device, &snd_soc_omap2evm);
 116
 117         ret = platform_device_add(omap2evm_snd_device);
 118         if (ret)
 119                 goto err1;
 120
 121         return 0;
 122
 123 err1:
 124         printk(KERN_ERR "Unable to add platform device\n");
 125         platform_device_put(omap2evm_snd_device);
 126
 127         return ret;
 128 }
 129 module_init(omap2evm_soc_init);
 130
 131 static void __exit omap2evm_soc_exit(void)
 132 {
 133         platform_device_unregister(omap2evm_snd_device);
 134 }
 135 module_exit(omap2evm_soc_exit);
 136
 137 MODULE_AUTHOR("Arun KS <arunks@mistralsolutions.com>");
 138 MODULE_DESCRIPTION("ALSA SoC omap2evm");
 139 MODULE_LICENSE("GPL");