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
 36static 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
 75static struct snd_soc_ops overo_ops = {
 76	.hw_params = overo_hw_params,
 77};
 78
 79/* Digital audio interface glue - connects codec <--> CPU */
 80static 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 */
 91static struct snd_soc_card snd_soc_card_overo = {
 92	.name = "overo",
 93	.dai_link = &overo_dai,
 94	.num_links = 1,
 95};
 96
 97static struct platform_device *overo_snd_device;
 98
 99static 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
123err1:
124	printk(KERN_ERR "Unable to add platform device\n");
125	platform_device_put(overo_snd_device);
126
127	return ret;
128}
129module_init(overo_soc_init);
130
131static void __exit overo_soc_exit(void)
132{
133	platform_device_unregister(overo_snd_device);
134}
135module_exit(overo_soc_exit);
136
137MODULE_AUTHOR("Steve Sakoman <steve@sakoman.com>");
138MODULE_DESCRIPTION("ALSA SoC overo");
139MODULE_LICENSE("GPL");