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/core.h> 26 #include <sound/control.h> 27 #include <sound/initval.h> 28 #include <sound/asoundef.h> 29 #include <sound/pcm.h> 30 #include <sound/ac97_codec.h> 31 #include "cs5535audio.h" 32 33 static void snd_cs5535audio_stop_hardware(struct cs5535audio *cs5535au) 34 { 35 /* 36 we depend on snd_ac97_suspend to tell the 37 AC97 codec to shutdown. the amd spec suggests 38 that the LNK_SHUTDOWN be done at the same time 39 that the codec power-down is issued. instead, 40 we do it just after rather than at the same 41 time. excluding codec specific build_ops->suspend 42 ac97 powerdown hits: 43 0x8000 EAPD 44 0x4000 Headphone amplifier 45 0x0300 ADC & DAC 46 0x0400 Analog Mixer powerdown (Vref on) 47 I am not sure if this is the best that we can do. 48 The remainder to be investigated are: 49 - analog mixer (vref off) 0x0800 50 - AC-link powerdown 0x1000 51 - codec internal clock 0x2000 52 */ 53 54 /* set LNK_SHUTDOWN to shutdown AC link */ 55 cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_SHUTDOWN); 56 57 } 58 59 int snd_cs5535audio_suspend(struct pci_dev *pci, pm_message_t state) 60 { 61 struct snd_card *card = pci_get_drvdata(pci); 62 struct cs5535audio *cs5535au = card->private_data; 63 int i; 64 65 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); 66 snd_pcm_suspend_all(cs5535au->pcm); 67 snd_ac97_suspend(cs5535au->ac97); 68 for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) { 69 struct cs5535audio_dma *dma = &cs5535au->dmas[i]; 70 if (dma && dma->substream) 71 dma->saved_prd = dma->ops->read_prd(cs5535au); 72 } 73 /* save important regs, then disable aclink in hw */ 74 snd_cs5535audio_stop_hardware(cs5535au); 75 76 if (pci_save_state(pci)) { 77 printk(KERN_ERR "cs5535audio: pci_save_state failed!\n"); 78 return -EIO; 79 } 80 pci_disable_device(pci); 81 pci_set_power_state(pci, pci_choose_state(pci, state)); 82 return 0; 83 } 84 85 int snd_cs5535audio_resume(struct pci_dev *pci) 86 { 87 struct snd_card *card = pci_get_drvdata(pci); 88 struct cs5535audio *cs5535au = card->private_data; 89 u32 tmp; 90 int timeout; 91 int i; 92 93 pci_set_power_state(pci, PCI_D0); 94 if (pci_restore_state(pci) < 0) { 95 printk(KERN_ERR "cs5535audio: pci_restore_state failed, " 96 "disabling device\n"); 97 snd_card_disconnect(card); 98 return -EIO; 99 } 100 if (pci_enable_device(pci) < 0) { 101 printk(KERN_ERR "cs5535audio: pci_enable_device failed, " 102 "disabling device\n"); 103 snd_card_disconnect(card); 104 return -EIO; 105 } 106 pci_set_master(pci); 107 108 /* set LNK_WRM_RST to reset AC link */ 109 cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_WRM_RST); 110 111 timeout = 50; 112 do { 113 tmp = cs_readl(cs5535au, ACC_CODEC_STATUS); 114 if (tmp & PRM_RDY_STS) 115 break; 116 udelay(1); 117 } while (--timeout); 118 119 if (!timeout) 120 snd_printk(KERN_ERR "Failure getting AC Link ready\n"); 121 122 /* set up rate regs, dma. actual initiation is done in trig */ 123 for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) { 124 struct cs5535audio_dma *dma = &cs5535au->dmas[i]; 125 if (dma && dma->substream) { 126 dma->substream->ops->prepare(dma->substream); 127 dma->ops->setup_prd(cs5535au, dma->saved_prd); 128 } 129 } 130 131 /* we depend on ac97 to perform the codec power up */ 132 snd_ac97_resume(cs5535au->ac97); 133 snd_power_change_state(card, SNDRV_CTL_POWER_D0); 134 135 return 0; 136 } 137 138