diff options
Diffstat (limited to 'sound/pci/cs5535audio/cs5535audio_pm.c')
| -rw-r--r-- | sound/pci/cs5535audio/cs5535audio_pm.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/sound/pci/cs5535audio/cs5535audio_pm.c b/sound/pci/cs5535audio/cs5535audio_pm.c new file mode 100644 index 000000000..82bd10b68 --- /dev/null +++ b/sound/pci/cs5535audio/cs5535audio_pm.c @@ -0,0 +1,115 @@ +/* + * 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/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); + +} + +static int __maybe_unused snd_cs5535audio_suspend(struct device *dev) +{ + struct snd_card *card = dev_get_drvdata(dev); + 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); + return 0; +} + +static int __maybe_unused snd_cs5535audio_resume(struct device *dev) +{ + struct snd_card *card = dev_get_drvdata(dev); + struct cs5535audio *cs5535au = card->private_data; + u32 tmp; + int timeout; + int i; + + /* 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) + dev_err(cs5535au->card->dev, "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; +} + +SIMPLE_DEV_PM_OPS(snd_cs5535audio_pm, snd_cs5535audio_suspend, snd_cs5535audio_resume); |