path: root/sound/soc/soc-dapm.c

/*
 * soc-dapm.c  --  ALSA SoC Dynamic Audio Power Management
 *
 * Copyright 2005 Wolfson Microelectronics PLC.
 * Author: Liam Girdwood
 *         liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
 *
 *  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.
 *
 *  Revision history
 *    12th Aug 2005   Initial version.
 *    25th Oct 2005   Implemented path power domain.
 *    18th Dec 2005   Implemented machine and stream level power domain.
 *
 *  Features:
 *    o Changes power status of internal codec blocks depending on the
 *      dynamic configuration of codec internal audio paths and active
 *      DAC's/ADC's.
 *    o Platform power domain - can support external components i.e. amps and
 *      mic/meadphone insertion events.
 *    o Automatic Mic Bias support
 *    o Jack insertion power event initiation - e.g. hp insertion will enable
 *      sinks, dacs, etc
 *    o Delayed powerdown of audio susbsytem to reduce pops between a quick
 *      device reopen.
 *
 *  Todo:
 *    o DAPM power change sequencing - allow for configurable per
 *      codec sequences.
 *    o Support for analogue bias optimisation.
 *    o Support for reduced codec oversampling rates.
 *    o Support for reduced codec bias currents.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/bitops.h>
#include <linux/platform_device.h>
#include <linux/jiffies.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>

/* debug */
#define DAPM_DEBUG 0
#if DAPM_DEBUG
#define dump_dapm(codec, action) dbg_dump_dapm(codec, action)
#define dbg(format, arg...) printk(format, ## arg)
#else
#define dump_dapm(codec, action)
#define dbg(format, arg...)
#endif

#define POP_DEBUG 0
#if POP_DEBUG
#define POP_TIME 500 /* 500 msecs - change if pop debug is too fast */
#define pop_wait(time) schedule_timeout_interruptible(msecs_to_jiffies(time))
#define pop_dbg(format, arg...) printk(format, ## arg); pop_wait(POP_TIME)
#else
#define pop_dbg(format, arg...)
#define pop_wait(time)
#endif

/* dapm power sequences - make this per codec in the future */
static int dapm_up_seq[] = {
	snd_soc_dapm_pre, snd_soc_dapm_micbias, snd_soc_dapm_mic,
	snd_soc_dapm_mux, snd_soc_dapm_dac, snd_soc_dapm_mixer, snd_soc_dapm_pga,
	snd_soc_dapm_adc, snd_soc_dapm_hp, snd_soc_dapm_spk, snd_soc_dapm_post
};
static int dapm_down_seq[] = {
	snd_soc_dapm_pre, snd_soc_dapm_adc, snd_soc_dapm_hp, snd_soc_dapm_spk,
	snd_soc_dapm_pga, snd_soc_dapm_mixer, snd_soc_dapm_dac, snd_soc_dapm_mic,
	snd_soc_dapm_micbias, snd_soc_dapm_mux, snd_soc_dapm_post
};

static int dapm_status = 1;
module_param(dapm_status, int, 0);
MODULE_PARM_DESC(dapm_status, "enable DPM sysfs entries");

/* create a new dapm widget */
static struct snd_soc_dapm_widget *dapm_cnew_widget(
	const struct snd_soc_dapm_widget *_widget)
{
	struct snd_soc_dapm_widget* widget;
	widget = kmalloc(sizeof(struct snd_soc_dapm_widget), GFP_KERNEL);
	if (!widget)
		return NULL;

	memcpy(widget, _widget, sizeof(struct snd_soc_dapm_widget));
	return widget;
}

/* set up initial codec paths */
static void dapm_set_path_status(struct snd_soc_dapm_widget *w,
	struct snd_soc_dapm_path *p, int i)
{
	switch (w