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cs5535audio_pm.c

/*
 * Power management for audio on multifunction CS5535 companion device
 * Copyright (C) Jaya Kumar
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/initval.h>
#include <sound/asoundef.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include "cs5535audio.h"

static void snd_cs5535audio_stop_hardware(struct cs5535audio *cs5535au)
{
      /* 
      we depend on snd_ac97_suspend to tell the
      AC97 codec to shutdown. the amd spec suggests
      that the LNK_SHUTDOWN be done at the same time
      that the codec power-down is issued. instead,
      we do it just after rather than at the same 
      time. excluding codec specific build_ops->suspend
      ac97 powerdown hits:
      0x8000 EAPD 
      0x4000 Headphone amplifier 
      0x0300 ADC & DAC 
      0x0400 Analog Mixer powerdown (Vref on) 
      I am not sure if this is the best that we can do.
      The remainder to be investigated are:
      - analog mixer (vref off) 0x0800
      - AC-link powerdown 0x1000
      - codec internal clock 0x2000
      */

      /* set LNK_SHUTDOWN to shutdown AC link */
      cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_SHUTDOWN);

}

int snd_cs5535audio_suspend(struct pci_dev *pci, pm_message_t state)
{
      struct snd_card *card = pci_get_drvdata(pci);
      struct cs5535audio *cs5535au = card->private_data;
      int i;

      snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
      for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
            struct cs5535audio_dma *dma = &cs5535au->dmas[i];
            if (dma && dma->substream && !dma->suspended) 
                  dma->saved_prd = dma->ops->read_prd(cs5535au);
      }
      snd_pcm_suspend_all(cs5535au->pcm);
      snd_ac97_suspend(cs5535au->ac97);
      /* save important regs, then disable aclink in hw */
      snd_cs5535audio_stop_hardware(cs5535au);
      pci_disable_device(pci);
      pci_save_state(pci);

      return 0;
}

int snd_cs5535audio_resume(struct pci_dev *pci)
{
      struct snd_card *card = pci_get_drvdata(pci);
      struct cs5535audio *cs5535au = card->private_data;
      u32 tmp;
      int timeout;
      int i;

      pci_restore_state(pci);
      pci_enable_device(pci);
      pci_set_master(pci);

      /* set LNK_WRM_RST to reset AC link */
      cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_WRM_RST);

      timeout = 50;
      do {
            tmp = cs_readl(cs5535au, ACC_CODEC_STATUS);
            if (tmp & PRM_RDY_STS)
                  break;
            udelay(1);
      } while (--timeout);

      if (!timeout)
            snd_printk(KERN_ERR "Failure getting AC Link ready\n");

      /* we depend on ac97 to perform the codec power up */
      snd_ac97_resume(cs5535au->ac97);
      /* set up rate regs, dma. actual initiation is done in trig */
      for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
            struct cs5535audio_dma *dma = &cs5535au->dmas[i];
            if (dma && dma->substream && dma->suspended) {
                  dma->substream->ops->prepare(dma->substream);
                  dma->ops->setup_prd(cs5535au, dma->saved_prd);
            }
      }
            
      snd_power_change_state(card, SNDRV_CTL_POWER_D0);

      return 0;
}


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