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Linux/sound/pci/cs5535audio/cs5535audio_pm.c

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  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);
116 

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