LXR linux/sound/pci/cs5535audio/cs5535audio

   1/*
   2 * Power management for audio on multifunction CS5535 companion device
   3 * Copyright (C) Jaya Kumar
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License as published by
   7 * the Free Software Foundation; either version 2 of the License, or
   8 * (at your option) any later version.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18 *
  19 */
  20
  21#include <linux/init.h>
  22#include <linux/pci.h>
  23#include <linux/delay.h>
  24#include <sound/core.h>
  25#include <sound/control.h>
  26#include <sound/initval.h>
  27#include <sound/asoundef.h>
  28#include <sound/pcm.h>
  29#include <sound/ac97_codec.h>
  30#include "cs5535audio.h"
  31
  32static void snd_cs5535audio_stop_hardware(struct cs5535audio *cs5535au)
  33{
  34        /* 
  35        we depend on snd_ac97_suspend to tell the
  36        AC97 codec to shutdown. the amd spec suggests
  37        that the LNK_SHUTDOWN be done at the same time
  38        that the codec power-down is issued. instead,
  39        we do it just after rather than at the same 
  40        time. excluding codec specific build_ops->suspend
  41        ac97 powerdown hits:
  42        0x8000 EAPD 
  43        0x4000 Headphone amplifier 
  44        0x0300 ADC & DAC 
  45        0x0400 Analog Mixer powerdown (Vref on) 
  46        I am not sure if this is the best that we can do.
  47        The remainder to be investigated are:
  48        - analog mixer (vref off) 0x0800
  49        - AC-link powerdown 0x1000
  50        - codec internal clock 0x2000
  51        */
  52
  53        /* set LNK_SHUTDOWN to shutdown AC link */
  54        cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_SHUTDOWN);
  55
  56}
  57
  58static int __maybe_unused snd_cs5535audio_suspend(struct device *dev)
  59{
  60        struct snd_card *card = dev_get_drvdata(dev);
  61        struct cs5535audio *cs5535au = card->private_data;
  62        int i;
  63
  64        snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
  65        snd_pcm_suspend_all(cs5535au->pcm);
  66        snd_ac97_suspend(cs5535au->ac97);
  67        for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
  68                struct cs5535audio_dma *dma = &cs5535au->dmas[i];
  69                if (dma && dma->substream)
  70                        dma->saved_prd = dma->ops->read_prd(cs5535au);
  71        }
  72        /* save important regs, then disable aclink in hw */
  73        snd_cs5535audio_stop_hardware(cs5535au);
  74        return 0;
  75}
  76
  77static int __maybe_unused snd_cs5535audio_resume(struct device *dev)
  78{
  79        struct snd_card *card = dev_get_drvdata(dev);
  80        struct cs5535audio *cs5535au = card->private_data;
  81        u32 tmp;
  82        int timeout;
  83        int i;
  84
  85        /* set LNK_WRM_RST to reset AC link */
  86        cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_WRM_RST);
  87
  88        timeout = 50;
  89        do {
  90                tmp = cs_readl(cs5535au, ACC_CODEC_STATUS);
  91                if (tmp & PRM_RDY_STS)
  92                        break;
  93                udelay(1);
  94        } while (--timeout);
  95
  96        if (!timeout)
  97                dev_err(cs5535au->card->dev, "Failure getting AC Link ready\n");
  98
  99        /* set up rate regs, dma. actual initiation is done in trig */
 100        for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
 101                struct cs5535audio_dma *dma = &cs5535au->dmas[i];
 102                if (dma && dma->substream) {
 103                        dma->substream->ops->prepare(dma->substream);
 104                        dma->ops->setup_prd(cs5535au, dma->saved_prd);
 105                }
 106        }
 107
 108        /* we depend on ac97 to perform the codec power up */
 109        snd_ac97_resume(cs5535au->ac97);
 110        snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 111
 112        return 0;
 113}
 114
 115SIMPLE_DEV_PM_OPS(snd_cs5535audio_pm, snd_cs5535audio_suspend, snd_cs5535audio_resume);
 116