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 32 static 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 58 static int snd_cs5535audio_suspend(struct device *dev) 59 { 60 struct snd_card *card = dev_get_drvdata(dev); 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 return 0; 75 } 76 77 static int snd_cs5535audio_resume(struct device *dev) 78 { 79 struct snd_card *card = dev_get_drvdata(dev); 80 struct cs5535audio *cs5535au = card->private_data; 81 u32 tmp; 82 int timeout; 83 int i; 84 85 /* set LNK_WRM_RST to reset AC link */ 86 cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_WRM_RST); 87 88 timeout = 50; 89 do { 90 tmp = cs_readl(cs5535au, ACC_CODEC_STATUS); 91 if (tmp & PRM_RDY_STS) 92 break; 93 udelay(1); 94 } while (--timeout); 95 96 if (!timeout) 97 dev_err(cs5535au->card->dev, "Failure getting AC Link ready\n"); 98 99 /* set up rate regs, dma. actual initiation is done in trig */ 100 for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) { 101 struct cs5535audio_dma *dma = &cs5535au->dmas[i]; 102 if (dma && dma->substream) { 103 dma->substream->ops->prepare(dma->substream); 104 dma->ops->setup_prd(cs5535au, dma->saved_prd); 105 } 106 } 107 108 /* we depend on ac97 to perform the codec power up */ 109 snd_ac97_resume(cs5535au->ac97); 110 snd_power_change_state(card, SNDRV_CTL_POWER_D0); 111 112 return 0; 113 } 114 115 SIMPLE_DEV_PM_OPS(snd_cs5535audio_pm, snd_cs5535audio_suspend, snd_cs5535audio_resume); 116