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
  28 #include <asm/mach-types.h>
  29 #include <mach/hardware.h>
  30 #include <mach/gpio.h>
  31 #include <plat/mcbsp.h>
  32
  33 #include "omap-mcbsp.h"
  34 #include "omap-pcm.h"
  35
  36 static int overo_hw_params(struct snd_pcm_substream *substream,
  37         struct snd_pcm_hw_params *params)
  38 {
  39         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  40         struct snd_soc_dai *codec_dai = rtd->codec_dai;
  41         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  42         int ret;
  43
  44         /* Set codec DAI configuration */
  45         ret = snd_soc_dai_set_fmt(codec_dai,
  46                                   SND_SOC_DAIFMT_I2S |
  47                                   SND_SOC_DAIFMT_NB_NF |
  48                                   SND_SOC_DAIFMT_CBM_CFM);
  49         if (ret < 0) {
  50                 printk(KERN_ERR "can't set codec DAI configuration\n");
  51                 return ret;
  52         }
  53
  54         /* Set cpu DAI configuration */
  55         ret = snd_soc_dai_set_fmt(cpu_dai,
  56                                   SND_SOC_DAIFMT_I2S |
  57                                   SND_SOC_DAIFMT_NB_NF |
  58                                   SND_SOC_DAIFMT_CBM_CFM);
  59         if (ret < 0) {
  60                 printk(KERN_ERR "can't set cpu DAI configuration\n");
  61                 return ret;
  62         }
  63
  64         /* Set the codec system clock for DAC and ADC */
  65         ret = snd_soc_dai_set_sysclk(codec_dai, 0, 26000000,
  66                                             SND_SOC_CLOCK_IN);
  67         if (ret < 0) {
  68                 printk(KERN_ERR "can't set codec system clock\n");
  69                 return ret;
  70         }
  71
  72         return 0;
  73 }
  74
  75 static struct snd_soc_ops overo_ops = {
  76         .hw_params = overo_hw_params,
  77 };
  78
  79 /* Digital audio interface glue - connects codec <--> CPU */
  80 static struct snd_soc_dai_link overo_dai = {
  81         .name = "TWL4030",
  82         .stream_name = "TWL4030",
  83         .cpu_dai_name = "omap-mcbsp-dai.1",
  84         .codec_dai_name = "twl4030-hifi",
  85         .platform_name = "omap-pcm-audio",
  86         .codec_name = "twl4030-codec",
  87         .ops = &overo_ops,
  88 };
  89
  90 /* Audio machine driver */
  91 static struct snd_soc_card snd_soc_card_overo = {
  92         .name = "overo",
  93         .dai_link = &overo_dai,
  94         .num_links = 1,
  95 };
  96
  97 static struct platform_device *overo_snd_device;
  98
  99 static int __init overo_soc_init(void)
 100 {
 101         int ret;
 102
 103         if (!(machine_is_overo() || machine_is_cm_t35())) {
 104                 pr_debug("Incomatible machine!\n");
 105                 return -ENODEV;
 106         }
 107         printk(KERN_INFO "overo SoC init\n");
 108
 109         overo_snd_device = platform_device_alloc("soc-audio", -1);
 110         if (!overo_snd_device) {
 111                 printk(KERN_ERR "Platform device allocation failed\n");
 112                 return -ENOMEM;
 113         }
 114
 115         platform_set_drvdata(overo_snd_device, &snd_soc_card_overo);
 116
 117         ret = platform_device_add(overo_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(overo_snd_device);
 126
 127         return ret;
 128 }
 129 module_init(overo_soc_init);
 130
 131 static void __exit overo_soc_exit(void)
 132 {
 133         platform_device_unregister(overo_snd_device);
 134 }
 135 module_exit(overo_soc_exit);
 136
 137 MODULE_AUTHOR("Steve Sakoman <steve@sakoman.com>");
 138 MODULE_DESCRIPTION("ALSA SoC overo");
 139 MODULE_LICENSE("GPL");