release/src-rt-6.x/linux/linux-2.6/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/slab.h>
  23 #include <linux/pci.h>
  24 #include <linux/delay.h>
  25 #include <sound/driver.h>
  26 #include <sound/core.h>
  27 #include <sound/control.h>
  28 #include <sound/initval.h>
  29 #include <sound/asoundef.h>
  30 #include <sound/pcm.h>
  31 #include <sound/ac97_codec.h>
  32 #include "cs5535audio.h"
  33
  34 static void snd_cs5535audio_stop_hardware(struct cs5535audio *cs5535au)
  35 {
  36         /*
  37         we depend on snd_ac97_suspend to tell the
  38         AC97 codec to shutdown. the amd spec suggests
  39         that the LNK_SHUTDOWN be done at the same time
  40         that the codec power-down is issued. instead,
  41         we do it just after rather than at the same
  42         time. excluding codec specific build_ops->suspend
  43         ac97 powerdown hits:
  44         0x8000 EAPD
  45         0x4000 Headphone amplifier
  46         0x0300 ADC & DAC
  47         0x0400 Analog Mixer powerdown (Vref on)
  48         I am not sure if this is the best that we can do.
  49         The remainder to be investigated are:
  50         - analog mixer (vref off) 0x0800
  51         - AC-link powerdown 0x1000
  52         - codec internal clock 0x2000
  53         */
  54
  55         /* set LNK_SHUTDOWN to shutdown AC link */
  56         cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_SHUTDOWN);
  57
  58 }
  59
  60 int snd_cs5535audio_suspend(struct pci_dev *pci, pm_message_t state)
  61 {
  62         struct snd_card *card = pci_get_drvdata(pci);
  63         struct cs5535audio *cs5535au = card->private_data;
  64         int i;
  65
  66         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
  67         for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
  68                 struct cs5535audio_dma *dma = &cs5535au->dmas[i];
  69                 if (dma && dma->substream && !dma->suspended)
  70                         dma->saved_prd = dma->ops->read_prd(cs5535au);
  71         }
  72         snd_pcm_suspend_all(cs5535au->pcm);
  73         snd_ac97_suspend(cs5535au->ac97);
  74         /* save important regs, then disable aclink in hw */
  75         snd_cs5535audio_stop_hardware(cs5535au);
  76
  77         pci_disable_device(pci);
  78         pci_save_state(pci);
  79         pci_set_power_state(pci, pci_choose_state(pci, state));
  80         return 0;
  81 }
  82
  83 int snd_cs5535audio_resume(struct pci_dev *pci)
  84 {
  85         struct snd_card *card = pci_get_drvdata(pci);
  86         struct cs5535audio *cs5535au = card->private_data;
  87         u32 tmp;
  88         int timeout;
  89         int i;
  90
  91         pci_set_power_state(pci, PCI_D0);
  92         pci_restore_state(pci);
  93         if (pci_enable_device(pci) < 0) {
  94                 printk(KERN_ERR "cs5535audio: pci_enable_device failed, "
  95                        "disabling device\n");
  96                 snd_card_disconnect(card);
  97                 return -EIO;
  98         }
  99         pci_set_master(pci);
 100
 101         /* set LNK_WRM_RST to reset AC link */
 102         cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_WRM_RST);
 103
 104         timeout = 50;
 105         do {
 106                 tmp = cs_readl(cs5535au, ACC_CODEC_STATUS);
 107                 if (tmp & PRM_RDY_STS)
 108                         break;
 109                 udelay(1);
 110         } while (--timeout);
 111
 112         if (!timeout)
 113                 snd_printk(KERN_ERR "Failure getting AC Link ready\n");
 114
 115         /* we depend on ac97 to perform the codec power up */
 116         snd_ac97_resume(cs5535au->ac97);
 117         /* set up rate regs, dma. actual initiation is done in trig */
 118         for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
 119                 struct cs5535audio_dma *dma = &cs5535au->dmas[i];
 120                 if (dma && dma->substream && dma->suspended) {
 121                         dma->substream->ops->prepare(dma->substream);
 122                         dma->ops->setup_prd(cs5535au, dma->saved_prd);
 123                 }
 124         }
 125
 126         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 127
 128         return 0;
 129 }
 130