1/*
  2 * omap3beagle.c  --  SoC audio for OMAP3 Beagle
  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 omap3beagle_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	unsigned int fmt;
 43	int ret;
 44
 45	switch (params_channels(params)) {
 46	case 2: /* Stereo I2S mode */
 47		fmt =	SND_SOC_DAIFMT_I2S |
 48			SND_SOC_DAIFMT_NB_NF |
 49			SND_SOC_DAIFMT_CBM_CFM;
 50		break;
 51	case 4: /* Four channel TDM mode */
 52		fmt =	SND_SOC_DAIFMT_DSP_A |
 53			SND_SOC_DAIFMT_IB_NF |
 54			SND_SOC_DAIFMT_CBM_CFM;
 55		break;
 56	default:
 57		return -EINVAL;
 58	}
 59
 60	/* Set codec DAI configuration */
 61	ret = snd_soc_dai_set_fmt(codec_dai, fmt);
 62	if (ret < 0) {
 63		printk(KERN_ERR "can't set codec DAI configuration\n");
 64		return ret;
 65	}
 66
 67	/* Set cpu DAI configuration */
 68	ret = snd_soc_dai_set_fmt(cpu_dai, fmt);
 69	if (ret < 0) {
 70		printk(KERN_ERR "can't set cpu DAI configuration\n");
 71		return ret;
 72	}
 73
 74	/* Set the codec system clock for DAC and ADC */
 75	ret = snd_soc_dai_set_sysclk(codec_dai, 0, 26000000,
 76				     SND_SOC_CLOCK_IN);
 77	if (ret < 0) {
 78		printk(KERN_ERR "can't set codec system clock\n");
 79		return ret;
 80	}
 81
 82	return 0;
 83}
 84
 85static struct snd_soc_ops omap3beagle_ops = {
 86	.hw_params = omap3beagle_hw_params,
 87};
 88
 89/* Digital audio interface glue - connects codec <--> CPU */
 90static struct snd_soc_dai_link omap3beagle_dai = {
 91	.name = "TWL4030",
 92	.stream_name = "TWL4030",
 93	.cpu_dai_name = "omap-mcbsp-dai.1",
 94	.platform_name = "omap-pcm-audio",
 95	.codec_dai_name = "twl4030-hifi",
 96	.codec_name = "twl4030-codec",
 97	.ops = &omap3beagle_ops,
 98};
 99
100/* Audio machine driver */
101static struct snd_soc_card snd_soc_omap3beagle = {
102	.name = "omap3beagle",
103	.owner = THIS_MODULE,
104	.dai_link = &omap3beagle_dai,
105	.num_links = 1,
106};
107
108static struct platform_device *omap3beagle_snd_device;
109
110static int __init omap3beagle_soc_init(void)
111{
112	int ret;
113
114	if (!(machine_is_omap3_beagle() || machine_is_devkit8000()))
115		return -ENODEV;
116	pr_info("OMAP3 Beagle/Devkit8000 SoC init\n");
117
118	omap3beagle_snd_device = platform_device_alloc("soc-audio", -1);
119	if (!omap3beagle_snd_device) {
120		printk(KERN_ERR "Platform device allocation failed\n");
121		return -ENOMEM;
122	}
123
124	platform_set_drvdata(omap3beagle_snd_device, &snd_soc_omap3beagle);
125
126	ret = platform_device_add(omap3beagle_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(omap3beagle_snd_device);
135
136	return ret;
137}
138
139static void __exit omap3beagle_soc_exit(void)
140{
141	platform_device_unregister(omap3beagle_snd_device);
142}
143
144module_init(omap3beagle_soc_init);
145module_exit(omap3beagle_soc_exit);
146
147MODULE_AUTHOR("Steve Sakoman <steve@sakoman.com>");
148MODULE_DESCRIPTION("ALSA SoC OMAP3 Beagle");
149MODULE_LICENSE("GPL");