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Linux/sound/soc/sh/migor.c

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  1 /*
  2  * ALSA SoC driver for Migo-R
  3  *
  4  * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 
 11 #include <linux/clkdev.h>
 12 #include <linux/device.h>
 13 #include <linux/firmware.h>
 14 #include <linux/module.h>
 15 
 16 #include <asm/clock.h>
 17 
 18 #include <cpu/sh7722.h>
 19 
 20 #include <sound/core.h>
 21 #include <sound/pcm.h>
 22 #include <sound/soc.h>
 23 
 24 #include "../codecs/wm8978.h"
 25 #include "siu.h"
 26 
 27 /* Default 8000Hz sampling frequency */
 28 static unsigned long codec_freq = 8000 * 512;
 29 
 30 static unsigned int use_count;
 31 
 32 /* External clock, sourced from the codec at the SIUMCKB pin */
 33 static unsigned long siumckb_recalc(struct clk *clk)
 34 {
 35         return codec_freq;
 36 }
 37 
 38 static struct sh_clk_ops siumckb_clk_ops = {
 39         .recalc = siumckb_recalc,
 40 };
 41 
 42 static struct clk siumckb_clk = {
 43         .ops            = &siumckb_clk_ops,
 44         .rate           = 0, /* initialised at run-time */
 45 };
 46 
 47 static struct clk_lookup *siumckb_lookup;
 48 
 49 static int migor_hw_params(struct snd_pcm_substream *substream,
 50                            struct snd_pcm_hw_params *params)
 51 {
 52         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 53         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 54         int ret;
 55         unsigned int rate = params_rate(params);
 56 
 57         ret = snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 13000000,
 58                                      SND_SOC_CLOCK_IN);
 59         if (ret < 0)
 60                 return ret;
 61 
 62         ret = snd_soc_dai_set_clkdiv(codec_dai, WM8978_OPCLKRATE, rate * 512);
 63         if (ret < 0)
 64                 return ret;
 65 
 66         codec_freq = rate * 512;
 67         /*
 68          * This propagates the parent frequency change to children and
 69          * recalculates the frequency table
 70          */
 71         clk_set_rate(&siumckb_clk, codec_freq);
 72         dev_dbg(codec_dai->dev, "%s: configure %luHz\n", __func__, codec_freq);
 73 
 74         ret = snd_soc_dai_set_sysclk(rtd->cpu_dai, SIU_CLKB_EXT,
 75                                      codec_freq / 2, SND_SOC_CLOCK_IN);
 76 
 77         if (!ret)
 78                 use_count++;
 79 
 80         return ret;
 81 }
 82 
 83 static int migor_hw_free(struct snd_pcm_substream *substream)
 84 {
 85         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 86         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 87 
 88         if (use_count) {
 89                 use_count--;
 90 
 91                 if (!use_count)
 92                         snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 0,
 93                                                SND_SOC_CLOCK_IN);
 94         } else {
 95                 dev_dbg(codec_dai->dev, "Unbalanced hw_free!\n");
 96         }
 97 
 98         return 0;
 99 }
100 
101 static const struct snd_soc_ops migor_dai_ops = {
102         .hw_params = migor_hw_params,
103         .hw_free = migor_hw_free,
104 };
105 
106 static const struct snd_soc_dapm_widget migor_dapm_widgets[] = {
107         SND_SOC_DAPM_HP("Headphone", NULL),
108         SND_SOC_DAPM_MIC("Onboard Microphone", NULL),
109         SND_SOC_DAPM_MIC("External Microphone", NULL),
110 };
111 
112 static const struct snd_soc_dapm_route audio_map[] = {
113         /* Headphone output connected to LHP/RHP, enable OUT4 for VMID */
114         { "Headphone", NULL,  "OUT4 VMID" },
115         { "OUT4 VMID", NULL,  "LHP" },
116         { "OUT4 VMID", NULL,  "RHP" },
117 
118         /* On-board microphone */
119         { "RMICN", NULL, "Mic Bias" },
120         { "RMICP", NULL, "Mic Bias" },
121         { "Mic Bias", NULL, "Onboard Microphone" },
122 
123         /* External microphone */
124         { "LMICN", NULL, "Mic Bias" },
125         { "LMICP", NULL, "Mic Bias" },
126         { "Mic Bias", NULL, "External Microphone" },
127 };
128 
129 /* migor digital audio interface glue - connects codec <--> CPU */
130 static struct snd_soc_dai_link migor_dai = {
131         .name = "wm8978",
132         .stream_name = "WM8978",
133         .cpu_dai_name = "siu-pcm-audio",
134         .codec_dai_name = "wm8978-hifi",
135         .platform_name = "siu-pcm-audio",
136         .codec_name = "wm8978.0-001a",
137         .dai_fmt = SND_SOC_DAIFMT_NB_IF | SND_SOC_DAIFMT_I2S |
138                    SND_SOC_DAIFMT_CBS_CFS,
139         .ops = &migor_dai_ops,
140 };
141 
142 /* migor audio machine driver */
143 static struct snd_soc_card snd_soc_migor = {
144         .name = "Migo-R",
145         .owner = THIS_MODULE,
146         .dai_link = &migor_dai,
147         .num_links = 1,
148 
149         .dapm_widgets = migor_dapm_widgets,
150         .num_dapm_widgets = ARRAY_SIZE(migor_dapm_widgets),
151         .dapm_routes = audio_map,
152         .num_dapm_routes = ARRAY_SIZE(audio_map),
153 };
154 
155 static struct platform_device *migor_snd_device;
156 
157 static int __init migor_init(void)
158 {
159         int ret;
160 
161         ret = clk_register(&siumckb_clk);
162         if (ret < 0)
163                 return ret;
164 
165         siumckb_lookup = clkdev_create(&siumckb_clk, "siumckb_clk", NULL);
166         if (!siumckb_lookup) {
167                 ret = -ENOMEM;
168                 goto eclkdevalloc;
169         }
170 
171         /* Port number used on this machine: port B */
172         migor_snd_device = platform_device_alloc("soc-audio", 1);
173         if (!migor_snd_device) {
174                 ret = -ENOMEM;
175                 goto epdevalloc;
176         }
177 
178         platform_set_drvdata(migor_snd_device, &snd_soc_migor);
179 
180         ret = platform_device_add(migor_snd_device);
181         if (ret)
182                 goto epdevadd;
183 
184         return 0;
185 
186 epdevadd:
187         platform_device_put(migor_snd_device);
188 epdevalloc:
189         clkdev_drop(siumckb_lookup);
190 eclkdevalloc:
191         clk_unregister(&siumckb_clk);
192         return ret;
193 }
194 
195 static void __exit migor_exit(void)
196 {
197         clkdev_drop(siumckb_lookup);
198         clk_unregister(&siumckb_clk);
199         platform_device_unregister(migor_snd_device);
200 }
201 
202 module_init(migor_init);
203 module_exit(migor_exit);
204 
205 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
206 MODULE_DESCRIPTION("ALSA SoC Migor");
207 MODULE_LICENSE("GPL v2");
208 

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