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
  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
  58int snd_cs5535audio_suspend(struct pci_dev *pci, pm_message_t state)
  59{
  60        struct snd_card *card = pci_get_drvdata(pci);
  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
  75        if (pci_save_state(pci)) {
  76                printk(KERN_ERR "cs5535audio: pci_save_state failed!\n");
  77                return -EIO;
  78        }
  79        pci_disable_device(pci);
  80        pci_set_power_state(pci, pci_choose_state(pci, state));
  81        return 0;
  82}
  83
  84int snd_cs5535audio_resume(struct pci_dev *pci)
  85{
  86        struct snd_card *card = pci_get_drvdata(pci);
  87        struct cs5535audio *cs5535au = card->private_data;
  88        u32 tmp;
  89        int timeout;
  90        int i;
  91
  92        pci_set_power_state(pci, PCI_D0);
  93        pci_restore_state(pci);
  94        if (pci_enable_device(pci) < 0) {
  95                printk(KERN_ERR "cs5535audio: pci_enable_device failed, "
  96                       "disabling device\n");
  97                snd_card_disconnect(card);
  98                return -EIO;
  99        }
 100        pci_set_master(pci);
 101
 102        /* set LNK_WRM_RST to reset AC link */
 103        cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_WRM_RST);
 104
 105        timeout = 50;
 106        do {
 107                tmp = cs_readl(cs5535au, ACC_CODEC_STATUS);
 108                if (tmp & PRM_RDY_STS)
 109                        break;
 110                udelay(1);
 111        } while (--timeout);
 112
 113        if (!timeout)
 114                snd_printk(KERN_ERR "Failure getting AC Link ready\n");
 115
 116        /* set up rate regs, dma. actual initiation is done in trig */
 117        for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
 118                struct cs5535audio_dma *dma = &cs5535au->dmas[i];
 119                if (dma && dma->substream) {
 120                        dma->substream->ops->prepare(dma->substream);
 121                        dma->ops->setup_prd(cs5535au, dma->saved_prd);
 122                }
 123        }
 124
 125        /* we depend on ac97 to perform the codec power up */
 126        snd_ac97_resume(cs5535au->ac97);
 127        snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 128
 129        return 0;
 130}
 131
 132