LXR linux/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 */
  33static int clk_pout;
  34module_param(clk_pout, int, 0);
  35MODULE_PARM_DESC(clk_pout, "Use CLK_POUT as WM9713 MCLK (SW15 on board).");
  36
  37static struct clk *pout;
  38
  39static struct snd_soc_card zylonite;
  40
  41static 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 */
  50static 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
  72static int zylonite_wm9713_init(struct snd_soc_pcm_runtime *rtd)
  73{
  74        struct snd_soc_codec *codec = rtd->codec;
  75        struct snd_soc_dapm_context *dapm = &codec->dapm;
  76
  77        if (clk_pout)
  78                snd_soc_dai_set_pll(rtd->codec_dai, 0, 0,
  79                                    clk_get_rate(pout), 0);
  80
  81        snd_soc_dapm_new_controls(dapm, zylonite_dapm_widgets,
  82                                  ARRAY_SIZE(zylonite_dapm_widgets));
  83
  84        snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map));
  85
  86        /* Static setup for now */
  87        snd_soc_dapm_enable_pin(dapm, "Headphone");
  88        snd_soc_dapm_enable_pin(dapm, "Headset Earpiece");
  89
  90        return 0;
  91}
  92
  93static int zylonite_voice_hw_params(struct snd_pcm_substream *substream,
  94                                    struct snd_pcm_hw_params *params)
  95{
  96        struct snd_soc_pcm_runtime *rtd = substream->private_data;
  97        struct snd_soc_dai *codec_dai = rtd->codec_dai;
  98        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  99        unsigned int pll_out = 0;
 100        unsigned int wm9713_div = 0;
 101        int ret = 0;
 102        int rate = params_rate(params);
 103        int width = snd_pcm_format_physical_width(params_format(params));
 104
 105        /* Only support ratios that we can generate neatly from the AC97
 106         * based master clock - in particular, this excludes 44.1kHz.
 107         * In most applications the voice DAC will be used for telephony
 108         * data so multiples of 8kHz will be the common case.
 109         */
 110        switch (rate) {
 111        case 8000:
 112                wm9713_div = 12;
 113                break;
 114        case 16000:
 115                wm9713_div = 6;
 116                break;
 117        case 48000:
 118                wm9713_div = 2;
 119                break;
 120        default:
 121                /* Don't support OSS emulation */
 122                return -EINVAL;
 123        }
 124
 125        /* Add 1 to the width for the leading clock cycle */
 126        pll_out = rate * (width + 1) * 8;
 127
 128        ret = snd_soc_dai_set_sysclk(cpu_dai, PXA_SSP_CLK_AUDIO, 0, 1);
 129        if (ret < 0)
 130                return ret;
 131
 132        ret = snd_soc_dai_set_pll(cpu_dai, 0, 0, 0, pll_out);
 133        if (ret < 0)
 134                return ret;
 135
 136        if (clk_pout)
 137                ret = snd_soc_dai_set_clkdiv(codec_dai, WM9713_PCMCLK_PLL_DIV,
 138                                             WM9713_PCMDIV(wm9713_div));
 139        else
 140                ret = snd_soc_dai_set_clkdiv(codec_dai, WM9713_PCMCLK_DIV,
 141                                             WM9713_PCMDIV(wm9713_div));
 142        if (ret < 0)
 143                return ret;
 144
 145        ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
 146                SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
 147        if (ret < 0)
 148                return ret;
 149
 150        ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
 151                SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
 152        if (ret < 0)
 153                return ret;
 154
 155        return 0;
 156}
 157
 158static struct snd_soc_ops zylonite_voice_ops = {
 159        .hw_params = zylonite_voice_hw_params,
 160};
 161
 162static struct snd_soc_dai_link zylonite_dai[] = {
 163{
 164        .name = "AC97",
 165        .stream_name = "AC97 HiFi",
 166        .codec_name = "wm9713-codec",
 167        .platform_name = "pxa-pcm-audio",
 168        .cpu_dai_name = "pxa2xx-ac97",
 169        .codec_dai_name = "wm9713-hifi",
 170        .init = zylonite_wm9713_init,
 171},
 172{
 173        .name = "AC97 Aux",
 174        .stream_name = "AC97 Aux",
 175        .codec_name = "wm9713-codec",
 176        .platform_name = "pxa-pcm-audio",
 177        .cpu_dai_name = "pxa2xx-ac97-aux",
 178        .codec_dai_name = "wm9713-aux",
 179},
 180{
 181        .name = "WM9713 Voice",
 182        .stream_name = "WM9713 Voice",
 183        .codec_name = "wm9713-codec",
 184        .platform_name = "pxa-pcm-audio",
 185        .cpu_dai_name = "pxa-ssp-dai.2",
 186        .codec_dai_name = "wm9713-voice",
 187        .ops = &zylonite_voice_ops,
 188},
 189};
 190
 191static int zylonite_probe(struct snd_soc_card *card)
 192{
 193        int ret;
 194
 195        if (clk_pout) {
 196                pout = clk_get(NULL, "CLK_POUT");
 197                if (IS_ERR(pout)) {
 198                        dev_err(card->dev, "Unable to obtain CLK_POUT: %ld\n",
 199                                PTR_ERR(pout));
 200                        return PTR_ERR(pout);
 201                }
 202
 203                ret = clk_enable(pout);
 204                if (ret != 0) {
 205                        dev_err(card->dev, "Unable to enable CLK_POUT: %d\n",
 206                                ret);
 207                        clk_put(pout);
 208                        return ret;
 209                }
 210
 211                dev_dbg(card->dev, "MCLK enabled at %luHz\n",
 212                        clk_get_rate(pout));
 213        }
 214
 215        return 0;
 216}
 217
 218static int zylonite_remove(struct snd_soc_card *card)
 219{
 220        if (clk_pout) {
 221                clk_disable(pout);
 222                clk_put(pout);
 223        }
 224
 225        return 0;
 226}
 227
 228static int zylonite_suspend_post(struct snd_soc_card *card)
 229{
 230        if (clk_pout)
 231                clk_disable(pout);
 232
 233        return 0;
 234}
 235
 236static int zylonite_resume_pre(struct snd_soc_card *card)
 237{
 238        int ret = 0;
 239
 240        if (clk_pout) {
 241                ret = clk_enable(pout);
 242                if (ret != 0)
 243                        dev_err(card->dev, "Unable to enable CLK_POUT: %d\n",
 244                                ret);
 245        }
 246
 247        return ret;
 248}
 249
 250static struct snd_soc_card zylonite = {
 251        .name = "Zylonite",
 252        .owner = THIS_MODULE,
 253        .probe = &zylonite_probe,
 254        .remove = &zylonite_remove,
 255        .suspend_post = &zylonite_suspend_post,
 256        .resume_pre = &zylonite_resume_pre,
 257        .dai_link = zylonite_dai,
 258        .num_links = ARRAY_SIZE(zylonite_dai),
 259        .owner = THIS_MODULE,
 260};
 261
 262static struct platform_device *zylonite_snd_ac97_device;
 263
 264static int __init zylonite_init(void)
 265{
 266        int ret;
 267
 268        zylonite_snd_ac97_device = platform_device_alloc("soc-audio", -1);
 269        if (!zylonite_snd_ac97_device)
 270                return -ENOMEM;
 271
 272        platform_set_drvdata(zylonite_snd_ac97_device, &zylonite);
 273
 274        ret = platform_device_add(zylonite_snd_ac97_device);
 275        if (ret != 0)
 276                platform_device_put(zylonite_snd_ac97_device);
 277
 278        return ret;
 279}
 280
 281static void __exit zylonite_exit(void)
 282{
 283        platform_device_unregister(zylonite_snd_ac97_device);
 284}
 285
 286module_init(zylonite_init);
 287module_exit(zylonite_exit);
 288
 289MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 290MODULE_DESCRIPTION("ALSA SoC WM9713 Zylonite");
 291MODULE_LICENSE("GPL");
 292