[GitHub/mt8127/android_kernel_alcatel_ttab.git] / sound / pci / cs5535audio / cs5535audio_pm.c

/*
 * Power management for audio on multifunction CS5535 companion device
 * Copyright (C) Jaya Kumar
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/init.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/initval.h>
#include <sound/asoundef.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include "cs5535audio.h"

static void snd_cs5535audio_stop_hardware(struct cs5535audio *cs5535au)
{
	/* 
	we depend on snd_ac97_suspend to tell the
	AC97 codec to shutdown. the amd spec suggests
	that the LNK_SHUTDOWN be done at the same time
	that the codec power-down is issued. instead,
	we do it just after rather than at the same 
	time. excluding codec specific build_ops->suspend
	ac97 powerdown hits:
	0x8000 EAPD 
	0x4000 Headphone amplifier 
	0x0300 ADC & DAC 
	0x0400 Analog Mixer powerdown (Vref on) 
	I am not sure if this is the best that we can do.
	The remainder to be investigated are:
	- analog mixer (vref off) 0x0800
	- AC-link powerdown 0x1000
	- codec internal clock 0x2000
	*/

	/* set LNK_SHUTDOWN to shutdown AC link */
	cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_SHUTDOWN);

}

static int snd_cs5535audio_suspend(struct device *dev)
{
	struct pci_dev *pci = to_pci_dev(dev);
	struct snd_card *card = dev_get_drvdata(dev);
	struct cs5535audio *cs5535au = card->private_data;
	int i;

	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
	snd_pcm_suspend_all(cs5535au->pcm);
	snd_ac97_suspend(cs5535au->ac97);
	for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
		struct cs5535audio_dma *dma = &cs5535au->dmas[i];
		if (dma && dma->substream)
			dma->saved_prd = dma->ops->read_prd(cs5535au);
	}
	/* save important regs, then disable aclink in hw */
	snd_cs5535audio_stop_hardware(cs5535au);

	if (pci_save_state(pci)) {
		printk(KERN_ERR "cs5535audio: pci_save_state failed!\n");
		return -EIO;
	}
	pci_disable_device(pci);
	pci_set_power_state(pci, PCI_D3hot);
	return 0;
}

static int snd_cs5535audio_resume(struct device *dev)
{
	struct pci_dev *pci = to_pci_dev(dev);
	struct snd_card *card = dev_get_drvdata(dev);
	struct cs5535audio *cs5535au = card->private_data;
	u32 tmp;
	int timeout;
	int i;

	pci_set_power_state(pci, PCI_D0);
	pci_restore_state(pci);
	if (pci_enable_device(pci) < 0) {
		printk(KERN_ERR "cs5535audio: pci_enable_device failed, "
		       "disabling device\n");
		snd_card_disconnect(card);
		return -EIO;
	}
	pci_set_master(pci);

	/* set LNK_WRM_RST to reset AC link */
	cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_WRM_RST);

	timeout = 50;
	do {
		tmp = cs_readl(cs5535au, ACC_CODEC_STATUS);
		if (tmp & PRM_RDY_STS)
			break;
		udelay(1);
	} while (--timeout);

	if (!timeout)
		snd_printk(KERN_ERR "Failure getting AC Link ready\n");

	/* set up rate regs, dma. actual initiation is done in trig */
	for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
		struct cs5535audio_dma *dma = &cs5535au->dmas[i];
		if (dma && dma->substream) {
			dma->substream->ops->prepare(dma->substream);
			dma->ops->setup_prd(cs5535au, dma->saved_prd);
		}
	}

	/* we depend on ac97 to perform the codec power up */
	snd_ac97_resume(cs5535au->ac97);
	snd_power_change_state(card, SNDRV_CTL_POWER_D0);

	return 0;
}

SIMPLE_DEV_PM_OPS(snd_cs5535audio_pm, snd_cs5535audio_suspend, snd_cs5535audio_resume);
Commit	Line	Data
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>
9ac25594 JK	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
68cb2b55	58	static int snd_cs5535audio_suspend(struct device *dev)
9ac25594	59	{
68cb2b55 TI	60	struct pci_dev *pci = to_pci_dev(dev);
68cb2b55 TI	61	struct snd_card *card = dev_get_drvdata(dev);
9ac25594 JK	62	struct cs5535audio *cs5535au = card->private_data;
	63	int i;
	64
	65	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
222fa0b0 AS	66	snd_pcm_suspend_all(cs5535au->pcm);
222fa0b0 AS	67	snd_ac97_suspend(cs5535au->ac97);
9ac25594 JK	68	for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
9ac25594 JK	69	struct cs5535audio_dma *dma = &cs5535au->dmas[i];
222fa0b0	70	if (dma && dma->substream)
9ac25594 JK	71	dma->saved_prd = dma->ops->read_prd(cs5535au);
9ac25594 JK	72	}
9ac25594 JK	73	/* save important regs, then disable aclink in hw */
9ac25594 JK	74	snd_cs5535audio_stop_hardware(cs5535au);
30b35399	75
1caae368 AS	76	if (pci_save_state(pci)) {
	77	printk(KERN_ERR "cs5535audio: pci_save_state failed!\n");
	78	return -EIO;
	79	}
9ac25594	80	pci_disable_device(pci);
68cb2b55	81	pci_set_power_state(pci, PCI_D3hot);
9ac25594 JK	82	return 0;
	83	}
	84
68cb2b55	85	static int snd_cs5535audio_resume(struct device *dev)
9ac25594	86	{
68cb2b55 TI	87	struct pci_dev *pci = to_pci_dev(dev);
68cb2b55 TI	88	struct snd_card *card = dev_get_drvdata(dev);
9ac25594 JK	89	struct cs5535audio *cs5535au = card->private_data;
	90	u32 tmp;
	91	int timeout;
	92	int i;
	93
30b35399	94	pci_set_power_state(pci, PCI_D0);
1d3c16a8	95	pci_restore_state(pci);
30b35399 TI	96	if (pci_enable_device(pci) < 0) {
	97	printk(KERN_ERR "cs5535audio: pci_enable_device failed, "
	98	"disabling device\n");
	99	snd_card_disconnect(card);
	100	return -EIO;
	101	}
9ac25594 JK	102	pci_set_master(pci);
	103
	104	/* set LNK_WRM_RST to reset AC link */
	105	cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_WRM_RST);
	106
	107	timeout = 50;
	108	do {
	109	tmp = cs_readl(cs5535au, ACC_CODEC_STATUS);
	110	if (tmp & PRM_RDY_STS)
	111	break;
	112	udelay(1);
	113	} while (--timeout);
	114
	115	if (!timeout)
	116	snd_printk(KERN_ERR "Failure getting AC Link ready\n");
	117
9ac25594 JK	118	/* set up rate regs, dma. actual initiation is done in trig */
	119	for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
	120	struct cs5535audio_dma *dma = &cs5535au->dmas[i];
222fa0b0	121	if (dma && dma->substream) {
9ac25594 JK	122	dma->substream->ops->prepare(dma->substream);
	123	dma->ops->setup_prd(cs5535au, dma->saved_prd);
	124	}
	125	}
222fa0b0 AS	126
	127	/* we depend on ac97 to perform the codec power up */
	128	snd_ac97_resume(cs5535au->ac97);
9ac25594 JK	129	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
	130
	131	return 0;
	132	}
	133
68cb2b55	134	SIMPLE_DEV_PM_OPS(snd_cs5535audio_pm, snd_cs5535audio_suspend, snd_cs5535audio_resume);