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 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 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");