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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> | |
9ac25594 JK |
22 | #include <linux/pci.h> |
23 | #include <linux/delay.h> | |
9ac25594 JK |
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 | ||
fe4cb86c | 58 | static int __maybe_unused snd_cs5535audio_suspend(struct device *dev) |
9ac25594 | 59 | { |
68cb2b55 | 60 | struct snd_card *card = dev_get_drvdata(dev); |
9ac25594 JK |
61 | struct cs5535audio *cs5535au = card->private_data; |
62 | int i; | |
63 | ||
64 | snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); | |
222fa0b0 AS |
65 | snd_pcm_suspend_all(cs5535au->pcm); |
66 | snd_ac97_suspend(cs5535au->ac97); | |
9ac25594 JK |
67 | for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) { |
68 | struct cs5535audio_dma *dma = &cs5535au->dmas[i]; | |
222fa0b0 | 69 | if (dma && dma->substream) |
9ac25594 JK |
70 | dma->saved_prd = dma->ops->read_prd(cs5535au); |
71 | } | |
9ac25594 JK |
72 | /* save important regs, then disable aclink in hw */ |
73 | snd_cs5535audio_stop_hardware(cs5535au); | |
9ac25594 JK |
74 | return 0; |
75 | } | |
76 | ||
fe4cb86c | 77 | static int __maybe_unused snd_cs5535audio_resume(struct device *dev) |
9ac25594 | 78 | { |
68cb2b55 | 79 | struct snd_card *card = dev_get_drvdata(dev); |
9ac25594 JK |
80 | struct cs5535audio *cs5535au = card->private_data; |
81 | u32 tmp; | |
82 | int timeout; | |
83 | int i; | |
84 | ||
9ac25594 JK |
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) | |
00980aa9 | 97 | dev_err(cs5535au->card->dev, "Failure getting AC Link ready\n"); |
9ac25594 | 98 | |
9ac25594 JK |
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]; | |
222fa0b0 | 102 | if (dma && dma->substream) { |
9ac25594 JK |
103 | dma->substream->ops->prepare(dma->substream); |
104 | dma->ops->setup_prd(cs5535au, dma->saved_prd); | |
105 | } | |
106 | } | |
222fa0b0 AS |
107 | |
108 | /* we depend on ac97 to perform the codec power up */ | |
109 | snd_ac97_resume(cs5535au->ac97); | |
9ac25594 JK |
110 | snd_power_change_state(card, SNDRV_CTL_POWER_D0); |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
68cb2b55 | 115 | SIMPLE_DEV_PM_OPS(snd_cs5535audio_pm, snd_cs5535audio_suspend, snd_cs5535audio_resume); |