ASoC: DaVinci: fix kernel panic due to uninitialized platform_data
[sitara-epos/sitara-epos-kernel.git] / sound / soc / codecs / cq93vc.c
1 /*
2  * ALSA SoC CQ0093 Voice Codec Driver for DaVinci platforms
3  *
4  * Copyright (C) 2010 Texas Instruments, Inc
5  *
6  * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21  */
22 #include <linux/module.h>
23 #include <linux/moduleparam.h>
24 #include <linux/init.h>
25 #include <linux/io.h>
26 #include <linux/delay.h>
27 #include <linux/pm.h>
28 #include <linux/platform_device.h>
29 #include <linux/device.h>
30 #include <linux/slab.h>
31 #include <linux/clk.h>
32 #include <linux/mfd/davinci_voicecodec.h>
33 #include <linux/spi/spi.h>
35 #include <sound/core.h>
36 #include <sound/pcm.h>
37 #include <sound/pcm_params.h>
38 #include <sound/soc.h>
39 #include <sound/initval.h>
41 #include <mach/dm365.h>
43 static inline unsigned int cq93vc_read(struct snd_soc_codec *codec,
44                                                 unsigned int reg)
45 {
46         struct davinci_vc *davinci_vc = codec->control_data;
48         return readl(davinci_vc->base + reg);
49 }
51 static inline int cq93vc_write(struct snd_soc_codec *codec, unsigned int reg,
52                        unsigned int value)
53 {
54         struct davinci_vc *davinci_vc = codec->control_data;
56         writel(value, davinci_vc->base + reg);
58         return 0;
59 }
61 static const struct snd_kcontrol_new cq93vc_snd_controls[] = {
62         SOC_SINGLE("PGA Capture Volume", DAVINCI_VC_REG05, 0, 0x03, 0),
63         SOC_SINGLE("Mono DAC Playback Volume", DAVINCI_VC_REG09, 0, 0x3f, 0),
64 };
66 static int cq93vc_mute(struct snd_soc_dai *dai, int mute)
67 {
68         struct snd_soc_codec *codec = dai->codec;
69         u8 reg = cq93vc_read(codec, DAVINCI_VC_REG09) & ~DAVINCI_VC_REG09_MUTE;
71         if (mute)
72                 cq93vc_write(codec, DAVINCI_VC_REG09,
73                              reg | DAVINCI_VC_REG09_MUTE);
74         else
75                 cq93vc_write(codec, DAVINCI_VC_REG09, reg);
77         return 0;
78 }
80 static int cq93vc_set_dai_sysclk(struct snd_soc_dai *codec_dai,
81                                  int clk_id, unsigned int freq, int dir)
82 {
83         struct snd_soc_codec *codec = codec_dai->codec;
84         struct davinci_vc *davinci_vc = codec->control_data;
86         switch (freq) {
87         case 22579200:
88         case 27000000:
89         case 33868800:
90                 davinci_vc->cq93vc.sysclk = freq;
91                 return 0;
92         }
94         return -EINVAL;
95 }
97 static int cq93vc_set_bias_level(struct snd_soc_codec *codec,
98                                 enum snd_soc_bias_level level)
99 {
100         switch (level) {
101         case SND_SOC_BIAS_ON:
102                 cq93vc_write(codec, DAVINCI_VC_REG12,
103                              DAVINCI_VC_REG12_POWER_ALL_ON);
104                 break;
105         case SND_SOC_BIAS_PREPARE:
106                 break;
107         case SND_SOC_BIAS_STANDBY:
108                 cq93vc_write(codec, DAVINCI_VC_REG12,
109                              DAVINCI_VC_REG12_POWER_ALL_OFF);
110                 break;
111         case SND_SOC_BIAS_OFF:
112                 /* force all power off */
113                 cq93vc_write(codec, DAVINCI_VC_REG12,
114                              DAVINCI_VC_REG12_POWER_ALL_OFF);
115                 break;
116         }
117         codec->dapm.bias_level = level;
119         return 0;
122 #define CQ93VC_RATES    (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000)
123 #define CQ93VC_FORMATS  (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
125 static struct snd_soc_dai_ops cq93vc_dai_ops = {
126         .digital_mute   = cq93vc_mute,
127         .set_sysclk     = cq93vc_set_dai_sysclk,
128 };
130 static struct snd_soc_dai_driver cq93vc_dai = {
131         .name = "cq93vc-hifi",
132         .playback = {
133                 .stream_name = "Playback",
134                 .channels_min = 1,
135                 .channels_max = 2,
136                 .rates = CQ93VC_RATES,
137                 .formats = CQ93VC_FORMATS,},
138         .capture = {
139                 .stream_name = "Capture",
140                 .channels_min = 1,
141                 .channels_max = 2,
142                 .rates = CQ93VC_RATES,
143                 .formats = CQ93VC_FORMATS,},
144         .ops = &cq93vc_dai_ops,
145 };
147 static int cq93vc_resume(struct snd_soc_codec *codec)
149         cq93vc_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
151         return 0;
154 static int cq93vc_probe(struct snd_soc_codec *codec)
156         struct davinci_vc *davinci_vc = snd_soc_codec_get_drvdata(codec);
158         davinci_vc->cq93vc.codec = codec;
159         codec->control_data = davinci_vc;
161         /* Set controls */
162         snd_soc_add_controls(codec, cq93vc_snd_controls,
163                              ARRAY_SIZE(cq93vc_snd_controls));
165         /* Off, with power on */
166         cq93vc_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
168         return 0;
171 static int cq93vc_remove(struct snd_soc_codec *codec)
173         cq93vc_set_bias_level(codec, SND_SOC_BIAS_OFF);
175         return 0;
178 static struct snd_soc_codec_driver soc_codec_dev_cq93vc = {
179         .read = cq93vc_read,
180         .write = cq93vc_write,
181         .set_bias_level = cq93vc_set_bias_level,
182         .probe = cq93vc_probe,
183         .remove = cq93vc_remove,
184         .resume = cq93vc_resume,
185 };
187 static int cq93vc_platform_probe(struct platform_device *pdev)
189         return snd_soc_register_codec(&pdev->dev,
190                         &soc_codec_dev_cq93vc, &cq93vc_dai, 1);
193 static int cq93vc_platform_remove(struct platform_device *pdev)
195         snd_soc_unregister_codec(&pdev->dev);
196         return 0;
199 static struct platform_driver cq93vc_codec_driver = {
200         .driver = {
201                         .name = "cq93vc-codec",
202                         .owner = THIS_MODULE,
203         },
205         .probe = cq93vc_platform_probe,
206         .remove = __devexit_p(cq93vc_platform_remove),
207 };
209 static int __init cq93vc_init(void)
211         return platform_driver_register(&cq93vc_codec_driver);
213 module_init(cq93vc_init);
215 static void __exit cq93vc_exit(void)
217         platform_driver_unregister(&cq93vc_codec_driver);
219 module_exit(cq93vc_exit);
221 MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC CQ0093 Voice Codec Driver");
222 MODULE_AUTHOR("Miguel Aguilar");
223 MODULE_LICENSE("GPL");