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soc-dapm.c
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soc-dapm.c
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/*
* soc-dapm.c -- ALSA SoC Dynamic Audio Power Management
*
* Copyright 2005 Wolfson Microelectronics PLC.
* Author: Liam Girdwood <[email protected]>
*
* 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.
*
* Features:
* o Changes power status of internal codec blocks depending on the
* dynamic configuration of codec internal audio paths and active
* DACs/ADCs.
* 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 susbsystem 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 <linux/debugfs.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <trace/events/asoc.h>
/* dapm power sequences - make this per codec in the future */
static int dapm_up_seq[] = {
[snd_soc_dapm_pre] = 0,
[snd_soc_dapm_supply] = 1,
[snd_soc_dapm_micbias] = 2,
[snd_soc_dapm_aif_in] = 3,
[snd_soc_dapm_aif_out] = 3,
[snd_soc_dapm_mic] = 4,
[snd_soc_dapm_mux] = 5,
[snd_soc_dapm_virt_mux] = 5,
[snd_soc_dapm_value_mux] = 5,
[snd_soc_dapm_dac] = 6,
[snd_soc_dapm_mixer] = 7,
[snd_soc_dapm_mixer_named_ctl] = 7,
[snd_soc_dapm_pga] = 8,
[snd_soc_dapm_adc] = 9,
[snd_soc_dapm_out_drv] = 10,
[snd_soc_dapm_hp] = 10,
[snd_soc_dapm_spk] = 10,
[snd_soc_dapm_post] = 11,
};
static int dapm_down_seq[] = {
[snd_soc_dapm_pre] = 0,
[snd_soc_dapm_adc] = 1,
[snd_soc_dapm_hp] = 2,
[snd_soc_dapm_spk] = 2,
[snd_soc_dapm_out_drv] = 2,
[snd_soc_dapm_pga] = 4,
[snd_soc_dapm_mixer_named_ctl] = 5,
[snd_soc_dapm_mixer] = 5,
[snd_soc_dapm_dac] = 6,
[snd_soc_dapm_mic] = 7,
[snd_soc_dapm_micbias] = 8,
[snd_soc_dapm_mux] = 9,
[snd_soc_dapm_virt_mux] = 9,
[snd_soc_dapm_value_mux] = 9,
[snd_soc_dapm_aif_in] = 10,
[snd_soc_dapm_aif_out] = 10,
[snd_soc_dapm_supply] = 11,
[snd_soc_dapm_post] = 12,
};
static void pop_wait(u32 pop_time)
{
if (pop_time)
schedule_timeout_uninterruptible(msecs_to_jiffies(pop_time));
}
static void pop_dbg(struct device *dev, u32 pop_time, const char *fmt, ...)
{
va_list args;
char *buf;
if (!pop_time)
return;
buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (buf == NULL)
return;
va_start(args, fmt);
vsnprintf(buf, PAGE_SIZE, fmt, args);
dev_info(dev, "%s", buf);
va_end(args);
kfree(buf);
}
/* create a new dapm widget */
static inline struct snd_soc_dapm_widget *dapm_cnew_widget(
const struct snd_soc_dapm_widget *_widget)
{
return kmemdup(_widget, sizeof(*_widget), GFP_KERNEL);
}
/**
* snd_soc_dapm_set_bias_level - set the bias level for the system
* @card: audio device
* @level: level to configure
*
* Configure the bias (power) levels for the SoC audio device.
*
* Returns 0 for success else error.
*/
static int snd_soc_dapm_set_bias_level(struct snd_soc_card *card,
struct snd_soc_dapm_context *dapm,
enum snd_soc_bias_level level)
{
int ret = 0;
switch (level) {
case SND_SOC_BIAS_ON:
dev_dbg(dapm->dev, "Setting full bias\n");
break;
case SND_SOC_BIAS_PREPARE:
dev_dbg(dapm->dev, "Setting bias prepare\n");
break;
case SND_SOC_BIAS_STANDBY:
dev_dbg(dapm->dev, "Setting standby bias\n");
break;
case SND_SOC_BIAS_OFF:
dev_dbg(dapm->dev, "Setting bias off\n");
break;
default:
dev_err(dapm->dev, "Setting invalid bias %d\n", level);
return -EINVAL;
}
trace_snd_soc_bias_level_start(card, level);
if (card && card->set_bias_level)
ret = card->set_bias_level(card, level);
if (ret == 0) {
if (dapm->codec && dapm->codec->driver->set_bias_level)
ret = dapm->codec->driver->set_bias_level(dapm->codec, level);
else
dapm->bias_level = level;
}
if (ret == 0) {
if (card && card->set_bias_level_post)
ret = card->set_bias_level_post(card, level);
}
trace_snd_soc_bias_level_done(card, level);
return ret;
}
/* 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->id) {
case snd_soc_dapm_switch:
case snd_soc_dapm_mixer:
case snd_soc_dapm_mixer_named_ctl: {
int val;
struct soc_mixer_control *mc = (struct soc_mixer_control *)
w->kcontrols[i].private_value;
unsigned int reg = mc->reg;
unsigned int shift = mc->shift;
int max = mc->max;
unsigned int mask = (1 << fls(max)) - 1;
unsigned int invert = mc->invert;
val = snd_soc_read(w->codec, reg);
val = (val >> shift) & mask;
if ((invert && !val) || (!invert && val))
p->connect = 1;
else
p->connect = 0;
}
break;
case snd_soc_dapm_mux: {
struct soc_enum *e = (struct soc_enum *)w->kcontrols[i].private_value;
int val, item, bitmask;
for (bitmask = 1; bitmask < e->max; bitmask <<= 1)
;
val = snd_soc_read(w->codec, e->reg);
item = (val >> e->shift_l) & (bitmask - 1);
p->connect = 0;
for (i = 0; i < e->max; i++) {
if (!(strcmp(p->name, e->texts[i])) && item == i)
p->connect = 1;
}
}
break;
case snd_soc_dapm_virt_mux: {
struct soc_enum *e = (struct soc_enum *)w->kcontrols[i].private_value;
p->connect = 0;
/* since a virtual mux has no backing registers to
* decide which path to connect, it will try to match
* with the first enumeration. This is to ensure
* that the default mux choice (the first) will be
* correctly powered up during initialization.
*/
if (!strcmp(p->name, e->texts[0]))
p->connect = 1;
}
break;
case snd_soc_dapm_value_mux: {
struct soc_enum *e = (struct soc_enum *)
w->kcontrols[i].private_value;
int val, item;
val = snd_soc_read(w->codec, e->reg);
val = (val >> e->shift_l) & e->mask;
for (item = 0; item < e->max; item++) {
if (val == e->values[item])
break;
}
p->connect = 0;
for (i = 0; i < e->max; i++) {
if (!(strcmp(p->name, e->texts[i])) && item == i)
p->connect = 1;
}
}
break;
/* does not effect routing - always connected */
case snd_soc_dapm_pga:
case snd_soc_dapm_out_drv:
case snd_soc_dapm_output:
case snd_soc_dapm_adc:
case snd_soc_dapm_input:
case snd_soc_dapm_dac:
case snd_soc_dapm_micbias:
case snd_soc_dapm_vmid:
case snd_soc_dapm_supply:
case snd_soc_dapm_aif_in:
case snd_soc_dapm_aif_out:
p->connect = 1;
break;
/* does effect routing - dynamically connected */
case snd_soc_dapm_hp:
case snd_soc_dapm_mic:
case snd_soc_dapm_spk:
case snd_soc_dapm_line:
case snd_soc_dapm_pre:
case snd_soc_dapm_post:
p->connect = 0;
break;
}
}
/* connect mux widget to its interconnecting audio paths */
static int dapm_connect_mux(struct snd_soc_dapm_context *dapm,
struct snd_soc_dapm_widget *src, struct snd_soc_dapm_widget *dest,
struct snd_soc_dapm_path *path, const char *control_name,
const struct snd_kcontrol_new *kcontrol)
{
struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
int i;
for (i = 0; i < e->max; i++) {
if (!(strcmp(control_name, e->texts[i]))) {
list_add(&path->list, &dapm->card->paths);
list_add(&path->list_sink, &dest->sources);
list_add(&path->list_source, &src->sinks);
path->name = (char*)e->texts[i];
dapm_set_path_status(dest, path, 0);
return 0;
}
}
return -ENODEV;
}
/* connect mixer widget to its interconnecting audio paths */
static int dapm_connect_mixer(struct snd_soc_dapm_context *dapm,
struct snd_soc_dapm_widget *src, struct snd_soc_dapm_widget *dest,
struct snd_soc_dapm_path *path, const char *control_name)
{
int i;
/* search for mixer kcontrol */
for (i = 0; i < dest->num_kcontrols; i++) {
if (!strcmp(control_name, dest->kcontrols[i].name)) {
list_add(&path->list, &dapm->card->paths);
list_add(&path->list_sink, &dest->sources);
list_add(&path->list_source, &src->sinks);
path->name = dest->kcontrols[i].name;
dapm_set_path_status(dest, path, i);
return 0;
}
}
return -ENODEV;
}
/* update dapm codec register bits */
static int dapm_update_bits(struct snd_soc_dapm_widget *widget)
{
int change, power;
unsigned int old, new;
struct snd_soc_codec *codec = widget->codec;
struct snd_soc_dapm_context *dapm = widget->dapm;
struct snd_soc_card *card = dapm->card;
/* check for valid widgets */
if (widget->reg < 0 || widget->id == snd_soc_dapm_input ||
widget->id == snd_soc_dapm_output ||
widget->id == snd_soc_dapm_hp ||
widget->id == snd_soc_dapm_mic ||
widget->id == snd_soc_dapm_line ||
widget->id == snd_soc_dapm_spk)
return 0;
power = widget->power;
if (widget->invert)
power = (power ? 0:1);
old = snd_soc_read(codec, widget->reg);
new = (old & ~(0x1 << widget->shift)) | (power << widget->shift);
change = old != new;
if (change) {
pop_dbg(dapm->dev, card->pop_time,
"pop test %s : %s in %d ms\n",
widget->name, widget->power ? "on" : "off",
card->pop_time);
pop_wait(card->pop_time);
snd_soc_write(codec, widget->reg, new);
}
dev_dbg(dapm->dev, "reg %x old %x new %x change %d\n", widget->reg,
old, new, change);
return change;
}
/* create new dapm mixer control */
static int dapm_new_mixer(struct snd_soc_dapm_context *dapm,
struct snd_soc_dapm_widget *w)
{
int i, ret = 0;
size_t name_len;
struct snd_soc_dapm_path *path;
struct snd_card *card = dapm->codec->card->snd_card;
/* add kcontrol */
for (i = 0; i < w->num_kcontrols; i++) {
/* match name */
list_for_each_entry(path, &w->sources, list_sink) {
/* mixer/mux paths name must match control name */
if (path->name != (char*)w->kcontrols[i].name)
continue;
/* add dapm control with long name.
* for dapm_mixer this is the concatenation of the
* mixer and kcontrol name.
* for dapm_mixer_named_ctl this is simply the
* kcontrol name.
*/
name_len = strlen(w->kcontrols[i].name) + 1;
if (w->id != snd_soc_dapm_mixer_named_ctl)
name_len += 1 + strlen(w->name);
path->long_name = kmalloc(name_len, GFP_KERNEL);
if (path->long_name == NULL)
return -ENOMEM;
switch (w->id) {
default:
snprintf(path->long_name, name_len, "%s %s",
w->name, w->kcontrols[i].name);
break;
case snd_soc_dapm_mixer_named_ctl:
snprintf(path->long_name, name_len, "%s",
w->kcontrols[i].name);
break;
}
path->long_name[name_len - 1] = '\0';
path->kcontrol = snd_soc_cnew(&w->kcontrols[i], w,
path->long_name);
ret = snd_ctl_add(card, path->kcontrol);
if (ret < 0) {
dev_err(dapm->dev,
"asoc: failed to add dapm kcontrol %s: %d\n",
path->long_name, ret);
kfree(path->long_name);
path->long_name = NULL;
return ret;
}
}
}
return ret;
}
/* create new dapm mux control */
static int dapm_new_mux(struct snd_soc_dapm_context *dapm,
struct snd_soc_dapm_widget *w)
{
struct snd_soc_dapm_path *path = NULL;
struct snd_kcontrol *kcontrol;
struct snd_card *card = dapm->codec->card->snd_card;
int ret = 0;
if (!w->num_kcontrols) {
dev_err(dapm->dev, "asoc: mux %s has no controls\n", w->name);
return -EINVAL;
}
kcontrol = snd_soc_cnew(&w->kcontrols[0], w, w->name);
ret = snd_ctl_add(card, kcontrol);
if (ret < 0)
goto err;
list_for_each_entry(path, &w->sources, list_sink)
path->kcontrol = kcontrol;
return ret;
err:
dev_err(dapm->dev, "asoc: failed to add kcontrol %s\n", w->name);
return ret;
}
/* create new dapm volume control */
static int dapm_new_pga(struct snd_soc_dapm_context *dapm,
struct snd_soc_dapm_widget *w)
{
if (w->num_kcontrols)
dev_err(w->dapm->dev,
"asoc: PGA controls not supported: '%s'\n", w->name);
return 0;
}
/* reset 'walked' bit for each dapm path */
static inline void dapm_clear_walk(struct snd_soc_dapm_context *dapm)
{
struct snd_soc_dapm_path *p;
list_for_each_entry(p, &dapm->card->paths, list)
p->walked = 0;
}
/* We implement power down on suspend by checking the power state of
* the ALSA card - when we are suspending the ALSA state for the card
* is set to D3.
*/
static int snd_soc_dapm_suspend_check(struct snd_soc_dapm_widget *widget)
{
int level = snd_power_get_state(widget->dapm->codec->card->snd_card);
switch (level) {
case SNDRV_CTL_POWER_D3hot:
case SNDRV_CTL_POWER_D3cold:
if (widget->ignore_suspend)
dev_dbg(widget->dapm->dev, "%s ignoring suspend\n",
widget->name);
return widget->ignore_suspend;
default:
return 1;
}
}
/*
* Recursively check for a completed path to an active or physically connected
* output widget. Returns number of complete paths.
*/
static int is_connected_output_ep(struct snd_soc_dapm_widget *widget)
{
struct snd_soc_dapm_path *path;
int con = 0;
if (widget->id == snd_soc_dapm_supply)
return 0;
switch (widget->id) {
case snd_soc_dapm_adc:
case snd_soc_dapm_aif_out:
if (widget->active)
return snd_soc_dapm_suspend_check(widget);
default:
break;
}
if (widget->connected) {
/* connected pin ? */
if (widget->id == snd_soc_dapm_output && !widget->ext)
return snd_soc_dapm_suspend_check(widget);
/* connected jack or spk ? */
if (widget->id == snd_soc_dapm_hp || widget->id == snd_soc_dapm_spk ||
(widget->id == snd_soc_dapm_line && !list_empty(&widget->sources)))
return snd_soc_dapm_suspend_check(widget);
}
list_for_each_entry(path, &widget->sinks, list_source) {
if (path->walked)
continue;
if (path->sink && path->connect) {
path->walked = 1;
con += is_connected_output_ep(path->sink);
}
}
return con;
}
/*
* Recursively check for a completed path to an active or physically connected
* input widget. Returns number of complete paths.
*/
static int is_connected_input_ep(struct snd_soc_dapm_widget *widget)
{
struct snd_soc_dapm_path *path;
int con = 0;
if (widget->id == snd_soc_dapm_supply)
return 0;
/* active stream ? */
switch (widget->id) {
case snd_soc_dapm_dac:
case snd_soc_dapm_aif_in:
if (widget->active)
return snd_soc_dapm_suspend_check(widget);
default:
break;
}
if (widget->connected) {
/* connected pin ? */
if (widget->id == snd_soc_dapm_input && !widget->ext)
return snd_soc_dapm_suspend_check(widget);
/* connected VMID/Bias for lower pops */
if (widget->id == snd_soc_dapm_vmid)
return snd_soc_dapm_suspend_check(widget);
/* connected jack ? */
if (widget->id == snd_soc_dapm_mic ||
(widget->id == snd_soc_dapm_line && !list_empty(&widget->sinks)))
return snd_soc_dapm_suspend_check(widget);
}
list_for_each_entry(path, &widget->sources, list_sink) {
if (path->walked)
continue;
if (path->source && path->connect) {
path->walked = 1;
con += is_connected_input_ep(path->source);
}
}
return con;
}
/*
* Handler for generic register modifier widget.
*/
int dapm_reg_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol, int event)
{
unsigned int val;
if (SND_SOC_DAPM_EVENT_ON(event))
val = w->on_val;
else
val = w->off_val;
snd_soc_update_bits(w->codec, -(w->reg + 1),
w->mask << w->shift, val << w->shift);
return 0;
}
EXPORT_SYMBOL_GPL(dapm_reg_event);
/* Standard power change method, used to apply power changes to most
* widgets.
*/
static int dapm_generic_apply_power(struct snd_soc_dapm_widget *w)
{
int ret;
/* call any power change event handlers */
if (w->event)
dev_dbg(w->dapm->dev, "power %s event for %s flags %x\n",
w->power ? "on" : "off",
w->name, w->event_flags);
/* power up pre event */
if (w->power && w->event &&
(w->event_flags & SND_SOC_DAPM_PRE_PMU)) {
ret = w->event(w, NULL, SND_SOC_DAPM_PRE_PMU);
if (ret < 0)
return ret;
}
/* power down pre event */
if (!w->power && w->event &&
(w->event_flags & SND_SOC_DAPM_PRE_PMD)) {
ret = w->event(w, NULL, SND_SOC_DAPM_PRE_PMD);
if (ret < 0)
return ret;
}
dapm_update_bits(w);
/* power up post event */
if (w->power && w->event &&
(w->event_flags & SND_SOC_DAPM_POST_PMU)) {
ret = w->event(w,
NULL, SND_SOC_DAPM_POST_PMU);
if (ret < 0)
return ret;
}
/* power down post event */
if (!w->power && w->event &&
(w->event_flags & SND_SOC_DAPM_POST_PMD)) {
ret = w->event(w, NULL, SND_SOC_DAPM_POST_PMD);
if (ret < 0)
return ret;
}
return 0;
}
/* Generic check to see if a widget should be powered.
*/
static int dapm_generic_check_power(struct snd_soc_dapm_widget *w)
{
int in, out;
in = is_connected_input_ep(w);
dapm_clear_walk(w->dapm);
out = is_connected_output_ep(w);
dapm_clear_walk(w->dapm);
return out != 0 && in != 0;
}
/* Check to see if an ADC has power */
static int dapm_adc_check_power(struct snd_soc_dapm_widget *w)
{
int in;
if (w->active) {
in = is_connected_input_ep(w);
dapm_clear_walk(w->dapm);
return in != 0;
} else {
return dapm_generic_check_power(w);
}
}
/* Check to see if a DAC has power */
static int dapm_dac_check_power(struct snd_soc_dapm_widget *w)
{
int out;
if (w->active) {
out = is_connected_output_ep(w);
dapm_clear_walk(w->dapm);
return out != 0;
} else {
return dapm_generic_check_power(w);
}
}
/* Check to see if a power supply is needed */
static int dapm_supply_check_power(struct snd_soc_dapm_widget *w)
{
struct snd_soc_dapm_path *path;
int power = 0;
/* Check if one of our outputs is connected */
list_for_each_entry(path, &w->sinks, list_source) {
if (path->connected &&
!path->connected(path->source, path->sink))
continue;
if (path->sink && path->sink->power_check &&
path->sink->power_check(path->sink)) {
power = 1;
break;
}
}
dapm_clear_walk(w->dapm);
return power;
}
static int dapm_seq_compare(struct snd_soc_dapm_widget *a,
struct snd_soc_dapm_widget *b,
int sort[])
{
if (sort[a->id] != sort[b->id])
return sort[a->id] - sort[b->id];
if (a->reg != b->reg)
return a->reg - b->reg;
if (a->dapm != b->dapm)
return (unsigned long)a->dapm - (unsigned long)b->dapm;
return 0;
}
/* Insert a widget in order into a DAPM power sequence. */
static void dapm_seq_insert(struct snd_soc_dapm_widget *new_widget,
struct list_head *list,
int sort[])
{
struct snd_soc_dapm_widget *w;
list_for_each_entry(w, list, power_list)
if (dapm_seq_compare(new_widget, w, sort) < 0) {
list_add_tail(&new_widget->power_list, &w->power_list);
return;
}
list_add_tail(&new_widget->power_list, list);
}
static void dapm_seq_check_event(struct snd_soc_dapm_context *dapm,
struct snd_soc_dapm_widget *w, int event)
{
struct snd_soc_card *card = dapm->card;
const char *ev_name;
int power, ret;
switch (event) {
case SND_SOC_DAPM_PRE_PMU:
ev_name = "PRE_PMU";
power = 1;
break;
case SND_SOC_DAPM_POST_PMU:
ev_name = "POST_PMU";
power = 1;
break;
case SND_SOC_DAPM_PRE_PMD:
ev_name = "PRE_PMD";
power = 0;
break;
case SND_SOC_DAPM_POST_PMD:
ev_name = "POST_PMD";
power = 0;
break;
default:
BUG();
return;
}
if (w->power != power)
return;
if (w->event && (w->event_flags & event)) {
pop_dbg(dapm->dev, card->pop_time, "pop test : %s %s\n",
w->name, ev_name);
trace_snd_soc_dapm_widget_event_start(w, event);
ret = w->event(w, NULL, event);
trace_snd_soc_dapm_widget_event_done(w, event);
if (ret < 0)
pr_err("%s: %s event failed: %d\n",
ev_name, w->name, ret);
}
}
/* Apply the coalesced changes from a DAPM sequence */
static void dapm_seq_run_coalesced(struct snd_soc_dapm_context *dapm,
struct list_head *pending)
{
struct snd_soc_card *card = dapm->card;
struct snd_soc_dapm_widget *w;
int reg, power;
unsigned int value = 0;
unsigned int mask = 0;
unsigned int cur_mask;
reg = list_first_entry(pending, struct snd_soc_dapm_widget,
power_list)->reg;
list_for_each_entry(w, pending, power_list) {
cur_mask = 1 << w->shift;
BUG_ON(reg != w->reg);
if (w->invert)
power = !w->power;
else
power = w->power;
mask |= cur_mask;
if (power)
value |= cur_mask;
pop_dbg(dapm->dev, card->pop_time,
"pop test : Queue %s: reg=0x%x, 0x%x/0x%x\n",
w->name, reg, value, mask);
/* Check for events */
dapm_seq_check_event(dapm, w, SND_SOC_DAPM_PRE_PMU);
dapm_seq_check_event(dapm, w, SND_SOC_DAPM_PRE_PMD);
}
if (reg >= 0) {
pop_dbg(dapm->dev, card->pop_time,
"pop test : Applying 0x%x/0x%x to %x in %dms\n",
value, mask, reg, card->pop_time);
pop_wait(card->pop_time);
snd_soc_update_bits(dapm->codec, reg, mask, value);
}
list_for_each_entry(w, pending, power_list) {
dapm_seq_check_event(dapm, w, SND_SOC_DAPM_POST_PMU);
dapm_seq_check_event(dapm, w, SND_SOC_DAPM_POST_PMD);
}
}
/* Apply a DAPM power sequence.
*
* We walk over a pre-sorted list of widgets to apply power to. In
* order to minimise the number of writes to the device required
* multiple widgets will be updated in a single write where possible.
* Currently anything that requires more than a single write is not
* handled.
*/
static void dapm_seq_run(struct snd_soc_dapm_context *dapm,
struct list_head *list, int event, int sort[])
{
struct snd_soc_dapm_widget *w, *n;
LIST_HEAD(pending);
int cur_sort = -1;
int cur_reg = SND_SOC_NOPM;
struct snd_soc_dapm_context *cur_dapm = NULL;
int ret;
list_for_each_entry_safe(w, n, list, power_list) {
ret = 0;
/* Do we need to apply any queued changes? */
if (sort[w->id] != cur_sort || w->reg != cur_reg ||
w->dapm != cur_dapm) {
if (!list_empty(&pending))
dapm_seq_run_coalesced(cur_dapm, &pending);
INIT_LIST_HEAD(&pending);
cur_sort = -1;
cur_reg = SND_SOC_NOPM;
cur_dapm = NULL;
}
switch (w->id) {
case snd_soc_dapm_pre:
if (!w->event)
list_for_each_entry_safe_continue(w, n, list,
power_list);
if (event == SND_SOC_DAPM_STREAM_START)
ret = w->event(w,
NULL, SND_SOC_DAPM_PRE_PMU);
else if (event == SND_SOC_DAPM_STREAM_STOP)
ret = w->event(w,
NULL, SND_SOC_DAPM_PRE_PMD);
break;
case snd_soc_dapm_post:
if (!w->event)
list_for_each_entry_safe_continue(w, n, list,
power_list);
if (event == SND_SOC_DAPM_STREAM_START)
ret = w->event(w,
NULL, SND_SOC_DAPM_POST_PMU);
else if (event == SND_SOC_DAPM_STREAM_STOP)
ret = w->event(w,
NULL, SND_SOC_DAPM_POST_PMD);
break;
case snd_soc_dapm_input:
case snd_soc_dapm_output:
case snd_soc_dapm_hp:
case snd_soc_dapm_mic:
case snd_soc_dapm_line:
case snd_soc_dapm_spk:
/* No register support currently */
ret = dapm_generic_apply_power(w);
break;
default:
/* Queue it up for application */
cur_sort = sort[w->id];
cur_reg = w->reg;
cur_dapm = w->dapm;
list_move(&w->power_list, &pending);
break;
}
if (ret < 0)
dev_err(w->dapm->dev,
"Failed to apply widget power: %d\n", ret);
}
if (!list_empty(&pending))
dapm_seq_run_coalesced(dapm, &pending);
}
static void dapm_widget_update(struct snd_soc_dapm_context *dapm)
{
struct snd_soc_dapm_update *update = dapm->update;
struct snd_soc_dapm_widget *w;
int ret;
if (!update)
return;
w = update->widget;
if (w->event &&
(w->event_flags & SND_SOC_DAPM_PRE_REG)) {
ret = w->event(w, update->kcontrol, SND_SOC_DAPM_PRE_REG);
if (ret != 0)
pr_err("%s DAPM pre-event failed: %d\n",
w->name, ret);
}
ret = snd_soc_update_bits(w->codec, update->reg, update->mask,
update->val);
if (ret < 0)
pr_err("%s DAPM update failed: %d\n", w->name, ret);
if (w->event &&
(w->event_flags & SND_SOC_DAPM_POST_REG)) {
ret = w->event(w, update->kcontrol, SND_SOC_DAPM_POST_REG);
if (ret != 0)
pr_err("%s DAPM post-event failed: %d\n",
w->name, ret);
}
}
/*
* Scan each dapm widget for complete audio path.
* A complete path is a route that has valid endpoints i.e.:-
*
* o DAC to output pin.
* o Input Pin to ADC.
* o Input pin to Output pin (bypass, sidetone)
* o DAC to ADC (loopback).
*/
static int dapm_power_widgets(struct snd_soc_dapm_context *dapm, int event)
{
struct snd_soc_card *card = dapm->codec->card;
struct snd_soc_dapm_widget *w;
struct snd_soc_dapm_context *d;
LIST_HEAD(up_list);
LIST_HEAD(down_list);
int ret = 0;
int power;
trace_snd_soc_dapm_start(card);
list_for_each_entry(d, &card->dapm_list, list)
if (d->n_widgets)
d->dev_power = 0;
/* Check which widgets we need to power and store them in
* lists indicating if they should be powered up or down.