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 <linux/module.h>
25 #include <sound/core.h>
26 #include <sound/pcm.h>
27 #include <sound/soc.h>
28
29 #include <asm/mach-types.h>
30 #include <mach/hardware.h>
31 #include <mach/gpio.h>
32 #include <plat/mcbsp.h>
33
34 #include "omap-mcbsp.h"
35 #include "omap-pcm.h"
36
overo_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)37 static int overo_hw_params(struct snd_pcm_substream *substream,
38 struct snd_pcm_hw_params *params)
39 {
40 struct snd_soc_pcm_runtime *rtd = substream->private_data;
41 struct snd_soc_dai *codec_dai = rtd->codec_dai;
42 int ret;
43
44 /* Set the codec system clock for DAC and ADC */
45 ret = snd_soc_dai_set_sysclk(codec_dai, 0, 26000000,
46 SND_SOC_CLOCK_IN);
47 if (ret < 0) {
48 printk(KERN_ERR "can't set codec system clock\n");
49 return ret;
50 }
51
52 return 0;
53 }
54
55 static struct snd_soc_ops overo_ops = {
56 .hw_params = overo_hw_params,
57 };
58
59 /* Digital audio interface glue - connects codec <--> CPU */
60 static struct snd_soc_dai_link overo_dai = {
61 .name = "TWL4030",
62 .stream_name = "TWL4030",
63 .cpu_dai_name = "omap-mcbsp.2",
64 .codec_dai_name = "twl4030-hifi",
65 .platform_name = "omap-pcm-audio",
66 .codec_name = "twl4030-codec",
67 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
68 SND_SOC_DAIFMT_CBM_CFM,
69 .ops = &overo_ops,
70 };
71
72 /* Audio machine driver */
73 static struct snd_soc_card snd_soc_card_overo = {
74 .name = "overo",
75 .owner = THIS_MODULE,
76 .dai_link = &overo_dai,
77 .num_links = 1,
78 };
79
80 static struct platform_device *overo_snd_device;
81
overo_soc_init(void)82 static int __init overo_soc_init(void)
83 {
84 int ret;
85
86 if (!(machine_is_overo() || machine_is_cm_t35())) {
87 pr_debug("Incomatible machine!\n");
88 return -ENODEV;
89 }
90 printk(KERN_INFO "overo SoC init\n");
91
92 overo_snd_device = platform_device_alloc("soc-audio", -1);
93 if (!overo_snd_device) {
94 printk(KERN_ERR "Platform device allocation failed\n");
95 return -ENOMEM;
96 }
97
98 platform_set_drvdata(overo_snd_device, &snd_soc_card_overo);
99
100 ret = platform_device_add(overo_snd_device);
101 if (ret)
102 goto err1;
103
104 return 0;
105
106 err1:
107 printk(KERN_ERR "Unable to add platform device\n");
108 platform_device_put(overo_snd_device);
109
110 return ret;
111 }
112 module_init(overo_soc_init);
113
overo_soc_exit(void)114 static void __exit overo_soc_exit(void)
115 {
116 platform_device_unregister(overo_snd_device);
117 }
118 module_exit(overo_soc_exit);
119
120 MODULE_AUTHOR("Steve Sakoman <steve@sakoman.com>");
121 MODULE_DESCRIPTION("ALSA SoC overo");
122 MODULE_LICENSE("GPL");
123