sound/soc/sh/migor.c

   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 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         ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_NB_IF |
  67                                   SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS);
  68         if (ret < 0)
  69                 return ret;
  70
  71         ret = snd_soc_dai_set_fmt(rtd->cpu_dai, SND_SOC_DAIFMT_NB_IF |
  72                                   SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS);
  73         if (ret < 0)
  74                 return ret;
  75
  76         codec_freq = rate * 512;
  77         /*
  78          * This propagates the parent frequency change to children and
  79          * recalculates the frequency table
  80          */
  81         clk_set_rate(&siumckb_clk, codec_freq);
  82         dev_dbg(codec_dai->dev, "%s: configure %luHz\n", __func__, codec_freq);
  83
  84         ret = snd_soc_dai_set_sysclk(rtd->cpu_dai, SIU_CLKB_EXT,
  85                                      codec_freq / 2, SND_SOC_CLOCK_IN);
  86
  87         if (!ret)
  88                 use_count++;
  89
  90         return ret;
  91 }
  92
  93 static int migor_hw_free(struct snd_pcm_substream *substream)
  94 {
  95         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  96         struct snd_soc_dai *codec_dai = rtd->codec_dai;
  97
  98         if (use_count) {
  99                 use_count--;
 100
 101                 if (!use_count)
 102                         snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 0,
 103                                                SND_SOC_CLOCK_IN);
 104         } else {
 105                 dev_dbg(codec_dai->dev, "Unbalanced hw_free!\n");
 106         }
 107
 108         return 0;
 109 }
 110
 111 static struct snd_soc_ops migor_dai_ops = {
 112         .hw_params = migor_hw_params,
 113         .hw_free = migor_hw_free,
 114 };
 115
 116 static const struct snd_soc_dapm_widget migor_dapm_widgets[] = {
 117         SND_SOC_DAPM_HP("Headphone", NULL),
 118         SND_SOC_DAPM_MIC("Onboard Microphone", NULL),
 119         SND_SOC_DAPM_MIC("External Microphone", NULL),
 120 };
 121
 122 static const struct snd_soc_dapm_route audio_map[] = {
 123         /* Headphone output connected to LHP/RHP, enable OUT4 for VMID */
 124         { "Headphone", NULL,  "OUT4 VMID" },
 125         { "OUT4 VMID", NULL,  "LHP" },
 126         { "OUT4 VMID", NULL,  "RHP" },
 127
 128         /* On-board microphone */
 129         { "RMICN", NULL, "Mic Bias" },
 130         { "RMICP", NULL, "Mic Bias" },
 131         { "Mic Bias", NULL, "Onboard Microphone" },
 132
 133         /* External microphone */
 134         { "LMICN", NULL, "Mic Bias" },
 135         { "LMICP", NULL, "Mic Bias" },
 136         { "Mic Bias", NULL, "External Microphone" },
 137 };
 138
 139 static int migor_dai_init(struct snd_soc_pcm_runtime *rtd)
 140 {
 141         struct snd_soc_codec *codec = rtd->codec;
 142         struct snd_soc_dapm_context *dapm = &codec->dapm;
 143
 144         snd_soc_dapm_new_controls(dapm, migor_dapm_widgets,
 145                                   ARRAY_SIZE(migor_dapm_widgets));
 146
 147         snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map));
 148
 149         return 0;
 150 }
 151
 152 /* migor digital audio interface glue - connects codec <--> CPU */
 153 static struct snd_soc_dai_link migor_dai = {
 154         .name = "wm8978",
 155         .stream_name = "WM8978",
 156         .cpu_dai_name = "siu-i2s-dai",
 157         .codec_dai_name = "wm8978-hifi",
 158         .platform_name = "siu-pcm-audio",
 159         .codec_name = "wm8978.0-001a",
 160         .ops = &migor_dai_ops,
 161         .init = migor_dai_init,
 162 };
 163
 164 /* migor audio machine driver */
 165 static struct snd_soc_card snd_soc_migor = {
 166         .name = "Migo-R",
 167         .dai_link = &migor_dai,
 168         .num_links = 1,
 169 };
 170
 171 static struct platform_device *migor_snd_device;
 172
 173 static int __init migor_init(void)
 174 {
 175         int ret;
 176
 177         ret = clk_register(&siumckb_clk);
 178         if (ret < 0)
 179                 return ret;
 180
 181         siumckb_lookup = clkdev_alloc(&siumckb_clk, "siumckb_clk", NULL);
 182         if (!siumckb_lookup) {
 183                 ret = -ENOMEM;
 184                 goto eclkdevalloc;
 185         }
 186         clkdev_add(siumckb_lookup);
 187
 188         /* Port number used on this machine: port B */
 189         migor_snd_device = platform_device_alloc("soc-audio", 1);
 190         if (!migor_snd_device) {
 191                 ret = -ENOMEM;
 192                 goto epdevalloc;
 193         }
 194
 195         platform_set_drvdata(migor_snd_device, &snd_soc_migor);
 196
 197         ret = platform_device_add(migor_snd_device);
 198         if (ret)
 199                 goto epdevadd;
 200
 201         return 0;
 202
 203 epdevadd:
 204         platform_device_put(migor_snd_device);
 205 epdevalloc:
 206         clkdev_drop(siumckb_lookup);
 207 eclkdevalloc:
 208         clk_unregister(&siumckb_clk);
 209         return ret;
 210 }
 211
 212 static void __exit migor_exit(void)
 213 {
 214         clkdev_drop(siumckb_lookup);
 215         clk_unregister(&siumckb_clk);
 216         platform_device_unregister(migor_snd_device);
 217 }
 218
 219 module_init(migor_init);
 220 module_exit(migor_exit);
 221
 222 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
 223 MODULE_DESCRIPTION("ALSA SoC Migor");
 224 MODULE_LICENSE("GPL v2");