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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 | ||
58 | int snd_cs5535audio_suspend(struct pci_dev *pci, pm_message_t state) | |
59 | { | |
60 | struct snd_card *card = pci_get_drvdata(pci); | |
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); | |
30b35399 | 74 | |
1caae368 AS |
75 | if (pci_save_state(pci)) { |
76 | printk(KERN_ERR "cs5535audio: pci_save_state failed!\n"); | |
77 | return -EIO; | |
78 | } | |
9ac25594 | 79 | pci_disable_device(pci); |
30b35399 | 80 | pci_set_power_state(pci, pci_choose_state(pci, state)); |
9ac25594 JK |
81 | return 0; |
82 | } | |
83 | ||
84 | int snd_cs5535audio_resume(struct pci_dev *pci) | |
85 | { | |
86 | struct snd_card *card = pci_get_drvdata(pci); | |
87 | struct cs5535audio *cs5535au = card->private_data; | |
88 | u32 tmp; | |
89 | int timeout; | |
90 | int i; | |
91 | ||
30b35399 | 92 | pci_set_power_state(pci, PCI_D0); |
1caae368 AS |
93 | if (pci_restore_state(pci) < 0) { |
94 | printk(KERN_ERR "cs5535audio: pci_restore_state failed, " | |
95 | "disabling device\n"); | |
96 | snd_card_disconnect(card); | |
97 | return -EIO; | |
98 | } | |
30b35399 TI |
99 | if (pci_enable_device(pci) < 0) { |
100 | printk(KERN_ERR "cs5535audio: pci_enable_device failed, " | |
101 | "disabling device\n"); | |
102 | snd_card_disconnect(card); | |
103 | return -EIO; | |
104 | } | |
9ac25594 JK |
105 | pci_set_master(pci); |
106 | ||
107 | /* set LNK_WRM_RST to reset AC link */ | |
108 | cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_WRM_RST); | |
109 | ||
110 | timeout = 50; | |
111 | do { | |
112 | tmp = cs_readl(cs5535au, ACC_CODEC_STATUS); | |
113 | if (tmp & PRM_RDY_STS) | |
114 | break; | |
115 | udelay(1); | |
116 | } while (--timeout); | |
117 | ||
118 | if (!timeout) | |
119 | snd_printk(KERN_ERR "Failure getting AC Link ready\n"); | |
120 | ||
9ac25594 JK |
121 | /* set up rate regs, dma. actual initiation is done in trig */ |
122 | for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) { | |
123 | struct cs5535audio_dma *dma = &cs5535au->dmas[i]; | |
222fa0b0 | 124 | if (dma && dma->substream) { |
9ac25594 JK |
125 | dma->substream->ops->prepare(dma->substream); |
126 | dma->ops->setup_prd(cs5535au, dma->saved_prd); | |
127 | } | |
128 | } | |
222fa0b0 AS |
129 | |
130 | /* we depend on ac97 to perform the codec power up */ | |
131 | snd_ac97_resume(cs5535au->ac97); | |
9ac25594 JK |
132 | snd_power_change_state(card, SNDRV_CTL_POWER_D0); |
133 | ||
134 | return 0; | |
135 | } | |
136 |