release/src-rt-6.x.4708/linux/linux-2.6.36/sound/soc/omap/overo.c

   1 /*
   2  * overo.c  --  SoC audio for Gumstix Overo
   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 <plat/mcbsp.h>
  33
  34 #include "omap-mcbsp.h"
  35 #include "omap-pcm.h"
  36 #include "../codecs/twl4030.h"
  37
  38 static int overo_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         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 overo_ops = {
  78         .hw_params = overo_hw_params,
  79 };
  80
  81 /* Digital audio interface glue - connects codec <--> CPU */
  82 static struct snd_soc_dai_link overo_dai = {
  83         .name = "TWL4030",
  84         .stream_name = "TWL4030",
  85         .cpu_dai = &omap_mcbsp_dai[0],
  86         .codec_dai = &twl4030_dai[TWL4030_DAI_HIFI],
  87         .ops = &overo_ops,
  88 };
  89
  90 /* Audio machine driver */
  91 static struct snd_soc_card snd_soc_card_overo = {
  92         .name = "overo",
  93         .platform = &omap_soc_platform,
  94         .dai_link = &overo_dai,
  95         .num_links = 1,
  96 };
  97
  98 /* Audio subsystem */
  99 static struct snd_soc_device overo_snd_devdata = {
 100         .card = &snd_soc_card_overo,
 101         .codec_dev = &soc_codec_dev_twl4030,
 102 };
 103
 104 static struct platform_device *overo_snd_device;
 105
 106 static int __init overo_soc_init(void)
 107 {
 108         int ret;
 109
 110         if (!(machine_is_overo() || machine_is_cm_t35())) {
 111                 pr_debug("Incomatible machine!\n");
 112                 return -ENODEV;
 113         }
 114         printk(KERN_INFO "overo SoC init\n");
 115
 116         overo_snd_device = platform_device_alloc("soc-audio", -1);
 117         if (!overo_snd_device) {
 118                 printk(KERN_ERR "Platform device allocation failed\n");
 119                 return -ENOMEM;
 120         }
 121
 122         platform_set_drvdata(overo_snd_device, &overo_snd_devdata);
 123         overo_snd_devdata.dev = &overo_snd_device->dev;
 124         *(unsigned int *)overo_dai.cpu_dai->private_data = 1; /* McBSP2 */
 125
 126         ret = platform_device_add(overo_snd_device);
 127         if (ret)
 128                 goto err1;
 129
 130         return 0;
 131
 132 err1:
 133         printk(KERN_ERR "Unable to add platform device\n");
 134         platform_device_put(overo_snd_device);
 135
 136         return ret;
 137 }
 138 module_init(overo_soc_init);
 139
 140 static void __exit overo_soc_exit(void)
 141 {
 142         platform_device_unregister(overo_snd_device);
 143 }
 144 module_exit(overo_soc_exit);
 145
 146 MODULE_AUTHOR("Steve Sakoman <steve@sakoman.com>");
 147 MODULE_DESCRIPTION("ALSA SoC overo");
 148 MODULE_LICENSE("GPL");