/* * 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/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); snd_pcm_suspend_all(cs5535au->pcm); snd_ac97_suspend(cs5535au->ac97); for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) { struct cs5535audio_dma *dma = &cs5535au->dmas[i]; if (dma && dma->substream) dma->saved_prd = dma->ops->read_prd(cs5535au); } /* save important regs, then disable aclink in hw */ snd_cs5535audio_stop_hardware(cs5535au); if (pci_save_state(pci)) { printk(KERN_ERR "cs5535audio: pci_save_state failed!\n"); return -EIO; } pci_disable_device(pci); pci_set_power_state(pci, pci_choose_state(pci, state)); 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_set_power_state(pci, PCI_D0); if (pci_restore_state(pci) < 0) { printk(KERN_ERR "cs5535audio: pci_restore_state failed, " "disabling device\n"); snd_card_disconnect(card); return -EIO; } if (pci_enable_device(pci) < 0) { printk(KERN_ERR "cs5535audio: pci_enable_device failed, " "disabling device\n"); snd_card_disconnect(card); return -EIO; } 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"); /* 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->substream->ops->prepare(dma->substream); dma->ops->setup_prd(cs5535au, dma->saved_prd); } } /* we depend on ac97 to perform the codec power up */ snd_ac97_resume(cs5535au->ac97); snd_power_change_state(card, SNDRV_CTL_POWER_D0); return 0; }