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/*
* omap3h1.c -- SoC audio for OMAP3 H1
*
* Author: Evan Wilson <evan@oliodevices.com>
*
* Adapted from omap3pandora
* Author: Steve Sakoman <steve@sakoman.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#define DEBUG
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <asm/mach-types.h>
#include <linux/platform_data/asoc-ti-mcbsp.h>
#include "omap-mcbsp.h"
static int omap3h1_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
//unsigned int fmt;
int ret = 0;
unsigned int freq;
//freq = 256 * params_rate(params);
// We are triggering from the 96 MHz FSCK
pr_info("ASoc OMAP3H1: setting system clock to: %d", freq);
ret = snd_soc_dai_set_sysclk(cpu_dai, OMAP_MCBSP_SYSCLK_CLKS_FCLK,
96000000, SND_SOC_CLOCK_OUT);
if (ret < 0) {
printk(KERN_ERR "can't set DMIC cpu system clock\n");
return ret;
}
// Set the divider so that our clock rate is ~3KHz, this is about 48KHz sampling frequency on the mic
// (32-bit/channel, 2 channels, 48 Khz sampling)
ret = snd_soc_dai_set_clkdiv(cpu_dai, OMAP_MCBSP_CLKGDV, 32);
if (ret < 0) {
pr_err("ASoc OMAP3H1: can't set SRG clock divider\n");
return ret;
}
return 0;
}
static struct snd_soc_ops omap3h1_ops = {
.hw_params = omap3h1_hw_params,
};
//static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = {
// SND_SOC_DAPM_MIC("Digital Mic", NULL),
//};
//
//static const struct snd_soc_dapm_route dmic_audio_map[] = {
// {"DMic", NULL, "Digital Mic"},
//};
/* Digital audio interface glue - connects codec <--> CPU */
static struct snd_soc_dai_link omap3h1_dai = {
.name = "DMIC",
.stream_name = "DMIC Capture",
.cpu_dai_name = "omap-mcbsp.3",
.codec_dai_name = "dmic-hifi",
.platform_name = "omap-pcm-audio",
.codec_name = "dmic-codec",
.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBS_CFS,
.ops = &omap3h1_ops,
};
/* Audio machine driver */
static struct snd_soc_card snd_soc_omap3h1 = {
.name = "omap3h1",
.owner = THIS_MODULE,
.dai_link = &omap3h1_dai,
.num_links = 1,
// .dapm_widgets = dmic_dapm_widgets,
// .num_dapm_widgets = ARRAY_SIZE(dmic_dapm_widgets),
// .dapm_routes = dmic_audio_map,
// .num_dapm_routes = ARRAY_SIZE(dmic_audio_map),
};
static struct platform_device *omap3h1_snd_device;
static int __init omap3h1_soc_init(void)
{
int ret;
if (!(machine_is_omap3_h1()))
return -ENODEV;
pr_info("OMAP3 H1 SoC init\n");
omap3h1_snd_device = platform_device_alloc("soc-audio", -1);
if (!omap3h1_snd_device) {
printk(KERN_ERR "Platform device allocation failed\n");
return -ENOMEM;
}
platform_set_drvdata(omap3h1_snd_device, &snd_soc_omap3h1);
ret = platform_device_add(omap3h1_snd_device);
if (ret)
goto err1;
return 0;
err1:
printk(KERN_ERR "Unable to add platform device\n");
platform_device_put(omap3h1_snd_device);
return ret;
}
static void __exit omap3h1_soc_exit(void)
{
platform_device_unregister(omap3h1_snd_device);
}
module_init(omap3h1_soc_init);
module_exit(omap3h1_soc_exit);
MODULE_AUTHOR("Evan Wilson <evan@oliodevices.com");
MODULE_DESCRIPTION("ALSA SoC OMAP3 H1");
MODULE_LICENSE("GPL");
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