release/src-rt-6.x.4708/linux/linux-2.6.36/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 #include <sound/soc-dapm.h>
  30
  31 #include <asm/mach-types.h>
  32 #include <mach/hardware.h>
  33 #include <mach/gpio.h>
  34 #include <plat/mcbsp.h>
  35
  36 #include "omap-mcbsp.h"
  37 #include "omap-pcm.h"
  38 #include "../codecs/twl4030.h"
  39
  40 static int omap2evm_hw_params(struct snd_pcm_substream *substream,
  41         struct snd_pcm_hw_params *params,
  42         struct snd_soc_dai *dai)
  43 {
  44         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  45         struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
  46         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
  47         int ret;
  48
  49         /* Set codec DAI configuration */
  50         ret = snd_soc_dai_set_fmt(codec_dai,
  51                                   SND_SOC_DAIFMT_I2S |
  52                                   SND_SOC_DAIFMT_NB_NF |
  53                                   SND_SOC_DAIFMT_CBM_CFM);
  54         if (ret < 0) {
  55                 printk(KERN_ERR "can't set codec DAI configuration\n");
  56                 return ret;
  57         }
  58
  59         /* Set cpu DAI configuration */
  60         ret = snd_soc_dai_set_fmt(cpu_dai,
  61                                   SND_SOC_DAIFMT_I2S |
  62                                   SND_SOC_DAIFMT_NB_NF |
  63                                   SND_SOC_DAIFMT_CBM_CFM);
  64         if (ret < 0) {
  65                 printk(KERN_ERR "can't set cpu DAI configuration\n");
  66                 return ret;
  67         }
  68
  69         /* Set the codec system clock for DAC and ADC */
  70         ret = snd_soc_dai_set_sysclk(codec_dai, 0, 26000000,
  71                                             SND_SOC_CLOCK_IN);
  72         if (ret < 0) {
  73                 printk(KERN_ERR "can't set codec system clock\n");
  74                 return ret;
  75         }
  76
  77         return 0;
  78 }
  79
  80 static struct snd_soc_ops omap2evm_ops = {
  81         .hw_params = omap2evm_hw_params,
  82 };
  83
  84 /* Digital audio interface glue - connects codec <--> CPU */
  85 static struct snd_soc_dai_link omap2evm_dai = {
  86         .name = "TWL4030",
  87         .stream_name = "TWL4030",
  88         .cpu_dai = &omap_mcbsp_dai[0],
  89         .codec_dai = &twl4030_dai[TWL4030_DAI_HIFI],
  90         .ops = &omap2evm_ops,
  91 };
  92
  93 /* Audio machine driver */
  94 static struct snd_soc_card snd_soc_omap2evm = {
  95         .name = "omap2evm",
  96         .platform = &omap_soc_platform,
  97         .dai_link = &omap2evm_dai,
  98         .num_links = 1,
  99 };
 100
 101 /* Audio subsystem */
 102 static struct snd_soc_device omap2evm_snd_devdata = {
 103         .card = &snd_soc_omap2evm,
 104         .codec_dev = &soc_codec_dev_twl4030,
 105 };
 106
 107 static struct platform_device *omap2evm_snd_device;
 108
 109 static int __init omap2evm_soc_init(void)
 110 {
 111         int ret;
 112
 113         if (!machine_is_omap2evm()) {
 114                 pr_debug("Not omap2evm!\n");
 115                 return -ENODEV;
 116         }
 117         printk(KERN_INFO "omap2evm SoC init\n");
 118
 119         omap2evm_snd_device = platform_device_alloc("soc-audio", -1);
 120         if (!omap2evm_snd_device) {
 121                 printk(KERN_ERR "Platform device allocation failed\n");
 122                 return -ENOMEM;
 123         }
 124
 125         platform_set_drvdata(omap2evm_snd_device, &omap2evm_snd_devdata);
 126         omap2evm_snd_devdata.dev = &omap2evm_snd_device->dev;
 127         *(unsigned int *)omap2evm_dai.cpu_dai->private_data = 1; /* McBSP2 */
 128
 129         ret = platform_device_add(omap2evm_snd_device);
 130         if (ret)
 131                 goto err1;
 132
 133         return 0;
 134
 135 err1:
 136         printk(KERN_ERR "Unable to add platform device\n");
 137         platform_device_put(omap2evm_snd_device);
 138
 139         return ret;
 140 }
 141 module_init(omap2evm_soc_init);
 142
 143 static void __exit omap2evm_soc_exit(void)
 144 {
 145         platform_device_unregister(omap2evm_snd_device);
 146 }
 147 module_exit(omap2evm_soc_exit);
 148
 149 MODULE_AUTHOR("Arun KS <arunks@mistralsolutions.com>");
 150 MODULE_DESCRIPTION("ALSA SoC omap2evm");
 151 MODULE_LICENSE("GPL");