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ASoC: Add support for omap2evm board
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1 /*
2  * omap2evm.c  --  SoC audio machine driver for omap2evm board
3  *
4  * Author: Arun KS <arunks@mistralsolutions.com>
5  *
6  * Based on sound/soc/omap/overo.c by Steve Sakoman
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License
10  * version 2 as published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20  * 02110-1301 USA
21  *
22  */
23
24 #include <linux/clk.h>
25 #include <linux/platform_device.h>
26 #include <sound/core.h>
27 #include <sound/pcm.h>
28 #include <sound/soc.h>
29 #include <sound/soc-dapm.h>
30
31 #include <asm/mach-types.h>
32 #include <mach/hardware.h>
33 #include <mach/gpio.h>
34 #include <mach/mcbsp.h>
35
36 #include "omap-mcbsp.h"
37 #include "omap-pcm.h"
38 #include "../codecs/twl4030.h"
39
40 static int omap2evm_hw_params(struct snd_pcm_substream *substream,
41         struct snd_pcm_hw_params *params)
42 {
43         struct snd_soc_pcm_runtime *rtd = substream->private_data;
44         struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
45         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
46         int ret;
47
48         /* Set codec DAI configuration */
49         ret = snd_soc_dai_set_fmt(codec_dai,
50                                   SND_SOC_DAIFMT_I2S |
51                                   SND_SOC_DAIFMT_NB_NF |
52                                   SND_SOC_DAIFMT_CBM_CFM);
53         if (ret < 0) {
54                 printk(KERN_ERR "can't set codec DAI configuration\n");
55                 return ret;
56         }
57
58         /* Set cpu DAI configuration */
59         ret = snd_soc_dai_set_fmt(cpu_dai,
60                                   SND_SOC_DAIFMT_I2S |
61                                   SND_SOC_DAIFMT_NB_NF |
62                                   SND_SOC_DAIFMT_CBM_CFM);
63         if (ret < 0) {
64                 printk(KERN_ERR "can't set cpu DAI configuration\n");
65                 return ret;
66         }
67
68         /* Set the codec system clock for DAC and ADC */
69         ret = snd_soc_dai_set_sysclk(codec_dai, 0, 26000000,
70                                             SND_SOC_CLOCK_IN);
71         if (ret < 0) {
72                 printk(KERN_ERR "can't set codec system clock\n");
73                 return ret;
74         }
75
76         return 0;
77 }
78
79 static struct snd_soc_ops omap2evm_ops = {
80         .hw_params = omap2evm_hw_params,
81 };
82
83 /* Digital audio interface glue - connects codec <--> CPU */
84 static struct snd_soc_dai_link omap2evm_dai = {
85         .name = "TWL4030",
86         .stream_name = "TWL4030",
87         .cpu_dai = &omap_mcbsp_dai[0],
88         .codec_dai = &twl4030_dai,
89         .ops = &omap2evm_ops,
90 };
91
92 /* Audio machine driver */
93 static struct snd_soc_machine snd_soc_machine_omap2evm = {
94         .name = "omap2evm",
95         .dai_link = &omap2evm_dai,
96         .num_links = 1,
97 };
98
99 /* Audio subsystem */
100 static struct snd_soc_device omap2evm_snd_devdata = {
101         .machine = &snd_soc_machine_omap2evm,
102         .platform = &omap_soc_platform,
103         .codec_dev = &soc_codec_dev_twl4030,
104 };
105
106 static struct platform_device *omap2evm_snd_device;
107
108 static int __init omap2evm_soc_init(void)
109 {
110         int ret;
111
112         if (!machine_is_omap2evm()) {
113                 pr_debug("Not omap2evm!\n");
114                 return -ENODEV;
115         }
116         printk(KERN_INFO "omap2evm SoC init\n");
117
118         omap2evm_snd_device = platform_device_alloc("soc-audio", -1);
119         if (!omap2evm_snd_device) {
120                 printk(KERN_ERR "Platform device allocation failed\n");
121                 return -ENOMEM;
122         }
123
124         platform_set_drvdata(omap2evm_snd_device, &omap2evm_snd_devdata);
125         omap2evm_snd_devdata.dev = &omap2evm_snd_device->dev;
126         *(unsigned int *)omap2evm_dai.cpu_dai->private_data = 1; /* McBSP2 */
127
128         ret = platform_device_add(omap2evm_snd_device);
129         if (ret)
130                 goto err1;
131
132         return 0;
133
134 err1:
135         printk(KERN_ERR "Unable to add platform device\n");
136         platform_device_put(omap2evm_snd_device);
137
138         return ret;
139 }
140 module_init(omap2evm_soc_init);
141
142 static void __exit omap2evm_soc_exit(void)
143 {
144         platform_device_unregister(omap2evm_snd_device);
145 }
146 module_exit(omap2evm_soc_exit);
147
148 MODULE_AUTHOR("Arun KS <arunks@mistralsolutions.com>");
149 MODULE_DESCRIPTION("ALSA SoC omap2evm");
150 MODULE_LICENSE("GPL");