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 <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 overo_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         int ret;
  43
  44         /* Set the codec system clock for DAC and ADC */
  45         ret = snd_soc_dai_set_sysclk(codec_dai, 0, 26000000,
  46                                             SND_SOC_CLOCK_IN);
  47         if (ret < 0) {
  48                 printk(KERN_ERR "can't set codec system clock\n");
  49                 return ret;
  50         }
  51
  52         return 0;
  53 }
  54
  55 static struct snd_soc_ops overo_ops = {
  56         .hw_params = overo_hw_params,
  57 };
  58
  59 /* Digital audio interface glue - connects codec <--> CPU */
  60 static struct snd_soc_dai_link overo_dai = {
  61         .name = "TWL4030",
  62         .stream_name = "TWL4030",
  63         .cpu_dai_name = "omap-mcbsp.2",
  64         .codec_dai_name = "twl4030-hifi",
  65         .platform_name = "omap-pcm-audio",
  66         .codec_name = "twl4030-codec",
  67         .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
  68                    SND_SOC_DAIFMT_CBM_CFM,
  69         .ops = &overo_ops,
  70 };
  71
  72 /* Audio machine driver */
  73 static struct snd_soc_card snd_soc_card_overo = {
  74         .name = "overo",
  75         .owner = THIS_MODULE,
  76         .dai_link = &overo_dai,
  77         .num_links = 1,
  78 };
  79
  80 static struct platform_device *overo_snd_device;
  81
  82 static int __init overo_soc_init(void)
  83 {
  84         int ret;
  85
  86         if (!(machine_is_overo() || machine_is_cm_t35())) {
  87                 pr_debug("Incomatible machine!\n");
  88                 return -ENODEV;
  89         }
  90         printk(KERN_INFO "overo SoC init\n");
  91
  92         overo_snd_device = platform_device_alloc("soc-audio", -1);
  93         if (!overo_snd_device) {
  94                 printk(KERN_ERR "Platform device allocation failed\n");
  95                 return -ENOMEM;
  96         }
  97
  98         platform_set_drvdata(overo_snd_device, &snd_soc_card_overo);
  99
 100         ret = platform_device_add(overo_snd_device);
 101         if (ret)
 102                 goto err1;
 103
 104         return 0;
 105
 106 err1:
 107         printk(KERN_ERR "Unable to add platform device\n");
 108         platform_device_put(overo_snd_device);
 109
 110         return ret;
 111 }
 112 module_init(overo_soc_init);
 113
 114 static void __exit overo_soc_exit(void)
 115 {
 116         platform_device_unregister(overo_snd_device);
 117 }
 118 module_exit(overo_soc_exit);
 119
 120 MODULE_AUTHOR("Steve Sakoman <steve@sakoman.com>");
 121 MODULE_DESCRIPTION("ALSA SoC overo");
 122 MODULE_LICENSE("GPL");