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
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