LXR linux/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 <mach/mcbsp.h>
  33
  34#include "omap-mcbsp.h"
  35#include "omap-pcm.h"
  36#include "../codecs/twl4030.h"
  37
  38static 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
  77static struct snd_soc_ops overo_ops = {
  78        .hw_params = overo_hw_params,
  79};
  80
  81/* Digital audio interface glue - connects codec <--> CPU */
  82static 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 */
  91static 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 */
  99static struct snd_soc_device overo_snd_devdata = {
 100        .card = &snd_soc_card_overo,
 101        .codec_dev = &soc_codec_dev_twl4030,
 102};
 103
 104static struct platform_device *overo_snd_device;
 105
 106static int __init overo_soc_init(void)
 107{
 108        int ret;
 109
 110        if (!machine_is_overo()) {
 111                pr_debug("Not Overo!\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
 132err1:
 133        printk(KERN_ERR "Unable to add platform device\n");
 134        platform_device_put(overo_snd_device);
 135
 136        return ret;
 137}
 138module_init(overo_soc_init);
 139
 140static void __exit overo_soc_exit(void)
 141{
 142        platform_device_unregister(overo_snd_device);
 143}
 144module_exit(overo_soc_exit);
 145
 146MODULE_AUTHOR("Steve Sakoman <steve@sakoman.com>");
 147MODULE_DESCRIPTION("ALSA SoC overo");
 148MODULE_LICENSE("GPL");
 149