linux/sound/arm/pxa2xx-ac97.c
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   1/*
   2 * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
   3 *
   4 * Author:      Nicolas Pitre
   5 * Created:     Dec 02, 2004
   6 * Copyright:   MontaVista Software Inc.
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12
  13#include <linux/init.h>
  14#include <linux/module.h>
  15#include <linux/platform_device.h>
  16
  17#include <sound/core.h>
  18#include <sound/pcm.h>
  19#include <sound/ac97_codec.h>
  20#include <sound/initval.h>
  21#include <sound/pxa2xx-lib.h>
  22
  23#include <mach/regs-ac97.h>
  24#include <mach/audio.h>
  25
  26#include "pxa2xx-pcm.h"
  27
  28static void pxa2xx_ac97_reset(struct snd_ac97 *ac97)
  29{
  30        if (!pxa2xx_ac97_try_cold_reset(ac97)) {
  31                pxa2xx_ac97_try_warm_reset(ac97);
  32        }
  33
  34        pxa2xx_ac97_finish_reset(ac97);
  35}
  36
  37static struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
  38        .read   = pxa2xx_ac97_read,
  39        .write  = pxa2xx_ac97_write,
  40        .reset  = pxa2xx_ac97_reset,
  41};
  42
  43static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_out = {
  44        .name                   = "AC97 PCM out",
  45        .dev_addr               = __PREG(PCDR),
  46        .drcmr                  = &DRCMR(12),
  47        .dcmd                   = DCMD_INCSRCADDR | DCMD_FLOWTRG |
  48                                  DCMD_BURST32 | DCMD_WIDTH4,
  49};
  50
  51static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_in = {
  52        .name                   = "AC97 PCM in",
  53        .dev_addr               = __PREG(PCDR),
  54        .drcmr                  = &DRCMR(11),
  55        .dcmd                   = DCMD_INCTRGADDR | DCMD_FLOWSRC |
  56                                  DCMD_BURST32 | DCMD_WIDTH4,
  57};
  58
  59static struct snd_pcm *pxa2xx_ac97_pcm;
  60static struct snd_ac97 *pxa2xx_ac97_ac97;
  61
  62static int pxa2xx_ac97_pcm_startup(struct snd_pcm_substream *substream)
  63{
  64        struct snd_pcm_runtime *runtime = substream->runtime;
  65        pxa2xx_audio_ops_t *platform_ops;
  66        int r;
  67
  68        runtime->hw.channels_min = 2;
  69        runtime->hw.channels_max = 2;
  70
  71        r = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  72            AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
  73        runtime->hw.rates = pxa2xx_ac97_ac97->rates[r];
  74        snd_pcm_limit_hw_rates(runtime);
  75
  76        platform_ops = substream->pcm->card->dev->platform_data;
  77        if (platform_ops && platform_ops->startup)
  78                return platform_ops->startup(substream, platform_ops->priv);
  79        else
  80                return 0;
  81}
  82
  83static void pxa2xx_ac97_pcm_shutdown(struct snd_pcm_substream *substream)
  84{
  85        pxa2xx_audio_ops_t *platform_ops;
  86
  87        platform_ops = substream->pcm->card->dev->platform_data;
  88        if (platform_ops && platform_ops->shutdown)
  89                platform_ops->shutdown(substream, platform_ops->priv);
  90}
  91
  92static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
  93{
  94        struct snd_pcm_runtime *runtime = substream->runtime;
  95        int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  96                  AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
  97        return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
  98}
  99
 100static struct pxa2xx_pcm_client pxa2xx_ac97_pcm_client = {
 101        .playback_params        = &pxa2xx_ac97_pcm_out,
 102        .capture_params         = &pxa2xx_ac97_pcm_in,
 103        .startup                = pxa2xx_ac97_pcm_startup,
 104        .shutdown               = pxa2xx_ac97_pcm_shutdown,
 105        .prepare                = pxa2xx_ac97_pcm_prepare,
 106};
 107
 108#ifdef CONFIG_PM
 109
 110static int pxa2xx_ac97_do_suspend(struct snd_card *card, pm_message_t state)
 111{
 112        pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
 113
 114        snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
 115        snd_pcm_suspend_all(pxa2xx_ac97_pcm);
 116        snd_ac97_suspend(pxa2xx_ac97_ac97);
 117        if (platform_ops && platform_ops->suspend)
 118                platform_ops->suspend(platform_ops->priv);
 119
 120        return pxa2xx_ac97_hw_suspend();
 121}
 122
 123static int pxa2xx_ac97_do_resume(struct snd_card *card)
 124{
 125        pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
 126        int rc;
 127
 128        rc = pxa2xx_ac97_hw_resume();
 129        if (rc)
 130                return rc;
 131
 132        if (platform_ops && platform_ops->resume)
 133                platform_ops->resume(platform_ops->priv);
 134        snd_ac97_resume(pxa2xx_ac97_ac97);
 135        snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 136
 137        return 0;
 138}
 139
 140static int pxa2xx_ac97_suspend(struct platform_device *dev, pm_message_t state)
 141{
 142        struct snd_card *card = platform_get_drvdata(dev);
 143        int ret = 0;
 144
 145        if (card)
 146                ret = pxa2xx_ac97_do_suspend(card, PMSG_SUSPEND);
 147
 148        return ret;
 149}
 150
 151static int pxa2xx_ac97_resume(struct platform_device *dev)
 152{
 153        struct snd_card *card = platform_get_drvdata(dev);
 154        int ret = 0;
 155
 156        if (card)
 157                ret = pxa2xx_ac97_do_resume(card);
 158
 159        return ret;
 160}
 161
 162#else
 163#define pxa2xx_ac97_suspend     NULL
 164#define pxa2xx_ac97_resume      NULL
 165#endif
 166
 167static int __devinit pxa2xx_ac97_probe(struct platform_device *dev)
 168{
 169        struct snd_card *card;
 170        struct snd_ac97_bus *ac97_bus;
 171        struct snd_ac97_template ac97_template;
 172        int ret;
 173
 174        ret = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 175                              THIS_MODULE, 0, &card);
 176        if (ret < 0)
 177                goto err;
 178
 179        card->dev = &dev->dev;
 180        strncpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
 181
 182        ret = pxa2xx_pcm_new(card, &pxa2xx_ac97_pcm_client, &pxa2xx_ac97_pcm);
 183        if (ret)
 184                goto err;
 185
 186        ret = pxa2xx_ac97_hw_probe(dev);
 187        if (ret)
 188                goto err;
 189
 190        ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
 191        if (ret)
 192                goto err_remove;
 193        memset(&ac97_template, 0, sizeof(ac97_template));
 194        ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
 195        if (ret)
 196                goto err_remove;
 197
 198        snprintf(card->shortname, sizeof(card->shortname),
 199                 "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
 200        snprintf(card->longname, sizeof(card->longname),
 201                 "%s (%s)", dev->dev.driver->name, card->mixername);
 202
 203        snd_card_set_dev(card, &dev->dev);
 204        ret = snd_card_register(card);
 205        if (ret == 0) {
 206                platform_set_drvdata(dev, card);
 207                return 0;
 208        }
 209
 210err_remove:
 211        pxa2xx_ac97_hw_remove(dev);
 212err:
 213        if (card)
 214                snd_card_free(card);
 215        return ret;
 216}
 217
 218static int __devexit pxa2xx_ac97_remove(struct platform_device *dev)
 219{
 220        struct snd_card *card = platform_get_drvdata(dev);
 221
 222        if (card) {
 223                snd_card_free(card);
 224                platform_set_drvdata(dev, NULL);
 225                pxa2xx_ac97_hw_remove(dev);
 226        }
 227
 228        return 0;
 229}
 230
 231static struct platform_driver pxa2xx_ac97_driver = {
 232        .probe          = pxa2xx_ac97_probe,
 233        .remove         = __devexit_p(pxa2xx_ac97_remove),
 234        .suspend        = pxa2xx_ac97_suspend,
 235        .resume         = pxa2xx_ac97_resume,
 236        .driver         = {
 237                .name   = "pxa2xx-ac97",
 238                .owner  = THIS_MODULE,
 239        },
 240};
 241
 242static int __init pxa2xx_ac97_init(void)
 243{
 244        return platform_driver_register(&pxa2xx_ac97_driver);
 245}
 246
 247static void __exit pxa2xx_ac97_exit(void)
 248{
 249        platform_driver_unregister(&pxa2xx_ac97_driver);
 250}
 251
 252module_init(pxa2xx_ac97_init);
 253module_exit(pxa2xx_ac97_exit);
 254
 255MODULE_AUTHOR("Nicolas Pitre");
 256MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
 257MODULE_LICENSE("GPL");
 258MODULE_ALIAS("platform:pxa2xx-ac97");
 259