kernel/sound/soc/pxa/zylonite.c

   1 /*
   2  * zylonite.c  --  SoC audio for Zylonite
   3  *
   4  * Copyright 2008 Wolfson Microelectronics PLC.
   5  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of the
  10  * License, or (at your option) any later version.
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/device.h>
  17 #include <linux/clk.h>
  18 #include <linux/i2c.h>
  19 #include <sound/core.h>
  20 #include <sound/pcm.h>
  21 #include <sound/pcm_params.h>
  22 #include <sound/soc.h>
  23
  24 #include "../codecs/wm9713.h"
  25 #include "pxa2xx-ac97.h"
  26 #include "pxa-ssp.h"
  27
  28 /*
  29  * There is a physical switch SW15 on the board which changes the MCLK
  30  * for the WM9713 between the standard AC97 master clock and the
  31  * output of the CLK_POUT signal from the PXA.
  32  */
  33 static int clk_pout;
  34 module_param(clk_pout, int, 0);
  35 MODULE_PARM_DESC(clk_pout, "Use CLK_POUT as WM9713 MCLK (SW15 on board).");
  36
  37 static struct clk *pout;
  38
  39 static struct snd_soc_card zylonite;
  40
  41 static const struct snd_soc_dapm_widget zylonite_dapm_widgets[] = {
  42         SND_SOC_DAPM_HP("Headphone", NULL),
  43         SND_SOC_DAPM_MIC("Headset Microphone", NULL),
  44         SND_SOC_DAPM_MIC("Handset Microphone", NULL),
  45         SND_SOC_DAPM_SPK("Multiactor", NULL),
  46         SND_SOC_DAPM_SPK("Headset Earpiece", NULL),
  47 };
  48
  49 /* Currently supported audio map */
  50 static const struct snd_soc_dapm_route audio_map[] = {
  51
  52         /* Headphone output connected to HPL/HPR */
  53         { "Headphone", NULL,  "HPL" },
  54         { "Headphone", NULL,  "HPR" },
  55
  56         /* On-board earpiece */
  57         { "Headset Earpiece", NULL, "OUT3" },
  58
  59         /* Headphone mic */
  60         { "MIC2A", NULL, "Mic Bias" },
  61         { "Mic Bias", NULL, "Headset Microphone" },
  62
  63         /* On-board mic */
  64         { "MIC1", NULL, "Mic Bias" },
  65         { "Mic Bias", NULL, "Handset Microphone" },
  66
  67         /* Multiactor differentially connected over SPKL/SPKR */
  68         { "Multiactor", NULL, "SPKL" },
  69         { "Multiactor", NULL, "SPKR" },
  70 };
  71
  72 static int zylonite_wm9713_init(struct snd_soc_pcm_runtime *rtd)
  73 {
  74         if (clk_pout)
  75                 snd_soc_dai_set_pll(rtd->codec_dai, 0, 0,
  76                                     clk_get_rate(pout), 0);
  77
  78         return 0;
  79 }
  80
  81 static int zylonite_voice_hw_params(struct snd_pcm_substream *substream,
  82                                     struct snd_pcm_hw_params *params)
  83 {
  84         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  85         struct snd_soc_dai *codec_dai = rtd->codec_dai;
  86         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  87         unsigned int pll_out = 0;
  88         unsigned int wm9713_div = 0;
  89         int ret = 0;
  90         int rate = params_rate(params);
  91         int width = snd_pcm_format_physical_width(params_format(params));
  92
  93         /* Only support ratios that we can generate neatly from the AC97
  94          * based master clock - in particular, this excludes 44.1kHz.
  95          * In most applications the voice DAC will be used for telephony
  96          * data so multiples of 8kHz will be the common case.
  97          */
  98         switch (rate) {
  99         case 8000:
 100                 wm9713_div = 12;
 101                 break;
 102         case 16000:
 103                 wm9713_div = 6;
 104                 break;
 105         case 48000:
 106                 wm9713_div = 2;
 107                 break;
 108         default:
 109                 /* Don't support OSS emulation */
 110                 return -EINVAL;
 111         }
 112
 113         /* Add 1 to the width for the leading clock cycle */
 114         pll_out = rate * (width + 1) * 8;
 115
 116         ret = snd_soc_dai_set_sysclk(cpu_dai, PXA_SSP_CLK_AUDIO, 0, 1);
 117         if (ret < 0)
 118                 return ret;
 119
 120         ret = snd_soc_dai_set_pll(cpu_dai, 0, 0, 0, pll_out);
 121         if (ret < 0)
 122                 return ret;
 123
 124         if (clk_pout)
 125                 ret = snd_soc_dai_set_clkdiv(codec_dai, WM9713_PCMCLK_PLL_DIV,
 126                                              WM9713_PCMDIV(wm9713_div));
 127         else
 128                 ret = snd_soc_dai_set_clkdiv(codec_dai, WM9713_PCMCLK_DIV,
 129                                              WM9713_PCMDIV(wm9713_div));
 130         if (ret < 0)
 131                 return ret;
 132
 133         return 0;
 134 }
 135
 136 static struct snd_soc_ops zylonite_voice_ops = {
 137         .hw_params = zylonite_voice_hw_params,
 138 };
 139
 140 static struct snd_soc_dai_link zylonite_dai[] = {
 141 {
 142         .name = "AC97",
 143         .stream_name = "AC97 HiFi",
 144         .codec_name = "wm9713-codec",
 145         .platform_name = "pxa-pcm-audio",
 146         .cpu_dai_name = "pxa2xx-ac97",
 147         .codec_dai_name = "wm9713-hifi",
 148         .init = zylonite_wm9713_init,
 149 },
 150 {
 151         .name = "AC97 Aux",
 152         .stream_name = "AC97 Aux",
 153         .codec_name = "wm9713-codec",
 154         .platform_name = "pxa-pcm-audio",
 155         .cpu_dai_name = "pxa2xx-ac97-aux",
 156         .codec_dai_name = "wm9713-aux",
 157 },
 158 {
 159         .name = "WM9713 Voice",
 160         .stream_name = "WM9713 Voice",
 161         .codec_name = "wm9713-codec",
 162         .platform_name = "pxa-pcm-audio",
 163         .cpu_dai_name = "pxa-ssp-dai.2",
 164         .codec_dai_name = "wm9713-voice",
 165         .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 166                    SND_SOC_DAIFMT_CBS_CFS,
 167         .ops = &zylonite_voice_ops,
 168 },
 169 };
 170
 171 static int zylonite_probe(struct snd_soc_card *card)
 172 {
 173         int ret;
 174
 175         if (clk_pout) {
 176                 pout = clk_get(NULL, "CLK_POUT");
 177                 if (IS_ERR(pout)) {
 178                         dev_err(card->dev, "Unable to obtain CLK_POUT: %ld\n",
 179                                 PTR_ERR(pout));
 180                         return PTR_ERR(pout);
 181                 }
 182
 183                 ret = clk_enable(pout);
 184                 if (ret != 0) {
 185                         dev_err(card->dev, "Unable to enable CLK_POUT: %d\n",
 186                                 ret);
 187                         clk_put(pout);
 188                         return ret;
 189                 }
 190
 191                 dev_dbg(card->dev, "MCLK enabled at %luHz\n",
 192                         clk_get_rate(pout));
 193         }
 194
 195         return 0;
 196 }
 197
 198 static int zylonite_remove(struct snd_soc_card *card)
 199 {
 200         if (clk_pout) {
 201                 clk_disable(pout);
 202                 clk_put(pout);
 203         }
 204
 205         return 0;
 206 }
 207
 208 static int zylonite_suspend_post(struct snd_soc_card *card)
 209 {
 210         if (clk_pout)
 211                 clk_disable(pout);
 212
 213         return 0;
 214 }
 215
 216 static int zylonite_resume_pre(struct snd_soc_card *card)
 217 {
 218         int ret = 0;
 219
 220         if (clk_pout) {
 221                 ret = clk_enable(pout);
 222                 if (ret != 0)
 223                         dev_err(card->dev, "Unable to enable CLK_POUT: %d\n",
 224                                 ret);
 225         }
 226
 227         return ret;
 228 }
 229
 230 static struct snd_soc_card zylonite = {
 231         .name = "Zylonite",
 232         .owner = THIS_MODULE,
 233         .probe = &zylonite_probe,
 234         .remove = &zylonite_remove,
 235         .suspend_post = &zylonite_suspend_post,
 236         .resume_pre = &zylonite_resume_pre,
 237         .dai_link = zylonite_dai,
 238         .num_links = ARRAY_SIZE(zylonite_dai),
 239
 240         .dapm_widgets = zylonite_dapm_widgets,
 241         .num_dapm_widgets = ARRAY_SIZE(zylonite_dapm_widgets),
 242         .dapm_routes = audio_map,
 243         .num_dapm_routes = ARRAY_SIZE(audio_map),
 244 };
 245
 246 static struct platform_device *zylonite_snd_ac97_device;
 247
 248 static int __init zylonite_init(void)
 249 {
 250         int ret;
 251
 252         zylonite_snd_ac97_device = platform_device_alloc("soc-audio", -1);
 253         if (!zylonite_snd_ac97_device)
 254                 return -ENOMEM;
 255
 256         platform_set_drvdata(zylonite_snd_ac97_device, &zylonite);
 257
 258         ret = platform_device_add(zylonite_snd_ac97_device);
 259         if (ret != 0)
 260                 platform_device_put(zylonite_snd_ac97_device);
 261
 262         return ret;
 263 }
 264
 265 static void __exit zylonite_exit(void)
 266 {
 267         platform_device_unregister(zylonite_snd_ac97_device);
 268 }
 269
 270 module_init(zylonite_init);
 271 module_exit(zylonite_exit);
 272
 273 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 274 MODULE_DESCRIPTION("ALSA SoC WM9713 Zylonite");
 275 MODULE_LICENSE("GPL");