sound/pci/cs5535audio/cs5535audio_pm.c

   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
  32 static 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
  58 static 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
  77 static 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
 115 SIMPLE_DEV_PM_OPS(snd_cs5535audio_pm, snd_cs5535audio_suspend, snd_cs5535audio_resume);