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