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 } 130 131