Commit | Line | Data |
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9ac25594 JK |
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 | pci_disable_device(pci); | |
77 | pci_save_state(pci); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | int snd_cs5535audio_resume(struct pci_dev *pci) | |
83 | { | |
84 | struct snd_card *card = pci_get_drvdata(pci); | |
85 | struct cs5535audio *cs5535au = card->private_data; | |
86 | u32 tmp; | |
87 | int timeout; | |
88 | int i; | |
89 | ||
90 | pci_restore_state(pci); | |
91 | pci_enable_device(pci); | |
92 | pci_set_master(pci); | |
93 | ||
94 | /* set LNK_WRM_RST to reset AC link */ | |
95 | cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_WRM_RST); | |
96 | ||
97 | timeout = 50; | |
98 | do { | |
99 | tmp = cs_readl(cs5535au, ACC_CODEC_STATUS); | |
100 | if (tmp & PRM_RDY_STS) | |
101 | break; | |
102 | udelay(1); | |
103 | } while (--timeout); | |
104 | ||
105 | if (!timeout) | |
106 | snd_printk(KERN_ERR "Failure getting AC Link ready\n"); | |
107 | ||
108 | /* we depend on ac97 to perform the codec power up */ | |
109 | snd_ac97_resume(cs5535au->ac97); | |
110 | /* set up rate regs, dma. actual initiation is done in trig */ | |
111 | for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) { | |
112 | struct cs5535audio_dma *dma = &cs5535au->dmas[i]; | |
113 | if (dma && dma->substream && dma->suspended) { | |
114 | dma->substream->ops->prepare(dma->substream); | |
115 | dma->ops->setup_prd(cs5535au, dma->saved_prd); | |
116 | } | |
117 | } | |
118 | ||
119 | snd_power_change_state(card, SNDRV_CTL_POWER_D0); | |
120 | ||
121 | return 0; | |
122 | } | |
123 |