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Linux/sound/soc/omap/osk5912.c

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  1 /*
  2  * osk5912.c  --  SoC audio for OSK 5912
  3  *
  4  * Copyright (C) 2008 Mistral Solutions
  5  *
  6  * Contact: Arun KS  <arunks@mistralsolutions.com>
  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 
 30 #include <asm/mach-types.h>
 31 #include <linux/gpio.h>
 32 #include <linux/module.h>
 33 #include <linux/platform_data/asoc-ti-mcbsp.h>
 34 
 35 #include "omap-mcbsp.h"
 36 #include "../codecs/tlv320aic23.h"
 37 
 38 #define CODEC_CLOCK     12000000
 39 
 40 static struct clk *tlv320aic23_mclk;
 41 
 42 static int osk_startup(struct snd_pcm_substream *substream)
 43 {
 44         return clk_enable(tlv320aic23_mclk);
 45 }
 46 
 47 static void osk_shutdown(struct snd_pcm_substream *substream)
 48 {
 49         clk_disable(tlv320aic23_mclk);
 50 }
 51 
 52 static int osk_hw_params(struct snd_pcm_substream *substream,
 53                          struct snd_pcm_hw_params *params)
 54 {
 55         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 56         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 57         int err;
 58 
 59         /* Set the codec system clock for DAC and ADC */
 60         err =
 61             snd_soc_dai_set_sysclk(codec_dai, 0, CODEC_CLOCK, SND_SOC_CLOCK_IN);
 62 
 63         if (err < 0) {
 64                 printk(KERN_ERR "can't set codec system clock\n");
 65                 return err;
 66         }
 67 
 68         return err;
 69 }
 70 
 71 static struct snd_soc_ops osk_ops = {
 72         .startup = osk_startup,
 73         .hw_params = osk_hw_params,
 74         .shutdown = osk_shutdown,
 75 };
 76 
 77 static const struct snd_soc_dapm_widget tlv320aic23_dapm_widgets[] = {
 78         SND_SOC_DAPM_HP("Headphone Jack", NULL),
 79         SND_SOC_DAPM_LINE("Line In", NULL),
 80         SND_SOC_DAPM_MIC("Mic Jack", NULL),
 81 };
 82 
 83 static const struct snd_soc_dapm_route audio_map[] = {
 84         {"Headphone Jack", NULL, "LHPOUT"},
 85         {"Headphone Jack", NULL, "RHPOUT"},
 86 
 87         {"LLINEIN", NULL, "Line In"},
 88         {"RLINEIN", NULL, "Line In"},
 89 
 90         {"MICIN", NULL, "Mic Jack"},
 91 };
 92 
 93 /* Digital audio interface glue - connects codec <--> CPU */
 94 static struct snd_soc_dai_link osk_dai = {
 95         .name = "TLV320AIC23",
 96         .stream_name = "AIC23",
 97         .cpu_dai_name = "omap-mcbsp.1",
 98         .codec_dai_name = "tlv320aic23-hifi",
 99         .platform_name = "omap-pcm-audio",
100         .codec_name = "tlv320aic23-codec",
101         .dai_fmt = SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_NB_NF |
102                    SND_SOC_DAIFMT_CBM_CFM,
103         .ops = &osk_ops,
104 };
105 
106 /* Audio machine driver */
107 static struct snd_soc_card snd_soc_card_osk = {
108         .name = "OSK5912",
109         .owner = THIS_MODULE,
110         .dai_link = &osk_dai,
111         .num_links = 1,
112 
113         .dapm_widgets = tlv320aic23_dapm_widgets,
114         .num_dapm_widgets = ARRAY_SIZE(tlv320aic23_dapm_widgets),
115         .dapm_routes = audio_map,
116         .num_dapm_routes = ARRAY_SIZE(audio_map),
117 };
118 
119 static struct platform_device *osk_snd_device;
120 
121 static int __init osk_soc_init(void)
122 {
123         int err;
124         u32 curRate;
125         struct device *dev;
126 
127         if (!(machine_is_omap_osk()))
128                 return -ENODEV;
129 
130         osk_snd_device = platform_device_alloc("soc-audio", -1);
131         if (!osk_snd_device)
132                 return -ENOMEM;
133 
134         platform_set_drvdata(osk_snd_device, &snd_soc_card_osk);
135         err = platform_device_add(osk_snd_device);
136         if (err)
137                 goto err1;
138 
139         dev = &osk_snd_device->dev;
140 
141         tlv320aic23_mclk = clk_get(dev, "mclk");
142         if (IS_ERR(tlv320aic23_mclk)) {
143                 printk(KERN_ERR "Could not get mclk clock\n");
144                 err = PTR_ERR(tlv320aic23_mclk);
145                 goto err2;
146         }
147 
148         /*
149          * Configure 12 MHz output on MCLK.
150          */
151         curRate = (uint) clk_get_rate(tlv320aic23_mclk);
152         if (curRate != CODEC_CLOCK) {
153                 if (clk_set_rate(tlv320aic23_mclk, CODEC_CLOCK)) {
154                         printk(KERN_ERR "Cannot set MCLK for AIC23 CODEC\n");
155                         err = -ECANCELED;
156                         goto err3;
157                 }
158         }
159 
160         printk(KERN_INFO "MCLK = %d [%d]\n",
161                (uint) clk_get_rate(tlv320aic23_mclk), CODEC_CLOCK);
162 
163         return 0;
164 
165 err3:
166         clk_put(tlv320aic23_mclk);
167 err2:
168         platform_device_del(osk_snd_device);
169 err1:
170         platform_device_put(osk_snd_device);
171 
172         return err;
173 
174 }
175 
176 static void __exit osk_soc_exit(void)
177 {
178         clk_put(tlv320aic23_mclk);
179         platform_device_unregister(osk_snd_device);
180 }
181 
182 module_init(osk_soc_init);
183 module_exit(osk_soc_exit);
184 
185 MODULE_AUTHOR("Arun KS <arunks@mistralsolutions.com>");
186 MODULE_DESCRIPTION("ALSA SoC OSK 5912");
187 MODULE_LICENSE("GPL");
188 

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