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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
* 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 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 <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>
/* debug */
#ifdef DEBUG
#define dump_dapm(codec, action) dbg_dump_dapm(codec, action)
#else
#define dump_dapm(codec, action)
#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");
static void pop_wait(u32 pop_time)
{
if (pop_time)
schedule_timeout_uninterruptible(msecs_to_jiffies(pop_time));
}
static void pop_dbg(u32 pop_time, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
if (pop_time) {
vprintk(fmt, args);
pop_wait(pop_time);
}
va_end(args);
}
/* 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);
}
/* 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: {
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;
/* does not effect routing - always connected */
case snd_soc_dapm_pga:
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:
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 it's interconnecting audio paths */
static int dapm_connect_mux(struct snd_soc_codec *codec,
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, &codec->dapm_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 it's interconnecting audio paths */
static int dapm_connect_mixer(struct snd_soc_codec *codec,
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, &codec->dapm_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 short old, new;
struct snd_soc_codec *codec = widget->codec;
/* 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(codec->pop_time, "pop test %s : %s in %d ms\n",
widget->name, widget->power ? "on" : "off",
codec->pop_time);
snd_soc_write(codec, widget->reg, new);
pop_wait(codec->pop_time);
}
pr_debug("reg %x old %x new %x change %d\n", widget->reg,
old, new, change);
return change;
}
/* ramps the volume up or down to minimise pops before or after a
* DAPM power event */
static int dapm_set_pga(struct snd_soc_dapm_widget *widget, int power)
{
const struct snd_kcontrol_new *k = widget->kcontrols;
if (widget->muted && !power)
return 0;
if (!widget->muted && power)
return 0;
if (widget->num_kcontrols && k) {
struct soc_mixer_control *mc =
(struct soc_mixer_control *)k->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;
if (power) {
int i;
/* power up has happended, increase volume to last level */
if (invert) {
for (i = max; i > widget->saved_value; i--)
snd_soc_update_bits(widget->codec, reg, mask, i);
} else {
for (i = 0; i < widget->saved_value; i++)
snd_soc_update_bits(widget->codec, reg, mask, i);
}
widget->muted = 0;
} else {
/* power down is about to occur, decrease volume to mute */
int val = snd_soc_read(widget->codec, reg);
int i = widget->saved_value = (val >> shift) & mask;
if (invert) {
for (; i < mask; i++)
snd_soc_update_bits(widget->codec, reg, mask, i);
} else {
for (; i > 0; i--)
snd_soc_update_bits(widget->codec, reg, mask, i);
}
widget->muted = 1;
}
}
return 0;
}
/* create new dapm mixer control */
static int dapm_new_mixer(struct snd_soc_codec *codec,
struct snd_soc_dapm_widget *w)
{
int i, ret = 0;
size_t name_len;
struct snd_soc_dapm_path *path;
/* 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 */
name_len = 2 + strlen(w->name)
+ strlen(w->kcontrols[i].name);
path->long_name = kmalloc(name_len, GFP_KERNEL);
if (path->long_name == NULL)
return -ENOMEM;
snprintf(path->long_name, name_len, "%s %s",
w->name, w->kcontrols[i].name);
path->long_name[name_len - 1] = '\0';
path->kcontrol = snd_soc_cnew(&w->kcontrols[i], w,
path->long_name);
ret = snd_ctl_add(codec->card, path->kcontrol);
if (ret < 0) {
printk(KERN_ERR "asoc: failed to add dapm kcontrol %s\n",
path->long_name);
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_codec *codec,
struct snd_soc_dapm_widget *w)
{
struct snd_soc_dapm_path *path = NULL;
struct snd_kcontrol *kcontrol;
int ret = 0;
if (!w->num_kcontrols) {
printk(KERN_ERR "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(codec->card, kcontrol);
if (ret < 0)
goto err;
list_for_each_entry(path, &w->sources, list_sink)
path->kcontrol = kcontrol;
return ret;
err:
printk(KERN_ERR "asoc: failed to add kcontrol %s\n", w->name);
return ret;
}
/* create new dapm volume control */
static int dapm_new_pga(struct snd_soc_codec *codec,
struct snd_soc_dapm_widget *w)
{
struct snd_kcontrol *kcontrol;
int ret = 0;
if (!w->num_kcontrols)
return -EINVAL;
kcontrol = snd_soc_cnew(&w->kcontrols[0], w, w->name);
ret = snd_ctl_add(codec->card, kcontrol);
if (ret < 0) {
printk(KERN_ERR "asoc: failed to add kcontrol %s\n", w->name);
return ret;
}
return ret;
}
/* reset 'walked' bit for each dapm path */
static inline void dapm_clear_walk(struct snd_soc_codec *codec)
{
struct snd_soc_dapm_path *p;
list_for_each_entry(p, &codec->dapm_paths, list)
p->walked = 0;
}
/*
* 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_adc && widget->active)
return 1;
if (widget->connected) {
/* connected pin ? */
if (widget->id == snd_soc_dapm_output && !widget->ext)
return 1;
/* connected jack or spk ? */
if (widget->id == snd_soc_dapm_hp || widget->id == snd_soc_dapm_spk ||
widget->id == snd_soc_dapm_line)
return 1;
}
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;
/* active stream ? */
if (widget->id == snd_soc_dapm_dac && widget->active)
return 1;
if (widget->connected) {
/* connected pin ? */
if (widget->id == snd_soc_dapm_input && !widget->ext)
return 1;
/* connected VMID/Bias for lower pops */
if (widget->id == snd_soc_dapm_vmid)
return 1;
/* connected jack ? */
if (widget->id == snd_soc_dapm_mic || widget->id == snd_soc_dapm_line)
return 1;
}
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);
/*
* 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_codec *codec, int event)
{
struct snd_soc_dapm_widget *w;
int in, out, i, c = 1, *seq = NULL, ret = 0, power_change, power;
/* do we have a sequenced stream event */
if (event == SND_SOC_DAPM_STREAM_START) {
c = ARRAY_SIZE(dapm_up_seq);
seq = dapm_up_seq;
} else if (event == SND_SOC_DAPM_STREAM_STOP) {
c = ARRAY_SIZE(dapm_down_seq);
seq = dapm_down_seq;
}
for(i = 0; i < c; i++) {
list_for_each_entry(w, &codec->dapm_widgets, list) {
/* is widget in stream order */
if (seq && seq[i] && w->id != seq[i])
continue;
/* vmid - no action */
if (w->id == snd_soc_dapm_vmid)
continue;
/* active ADC */
if (w->id == snd_soc_dapm_adc && w->active) {
in = is_connected_input_ep(w);
dapm_clear_walk(w->codec);
w->power = (in != 0) ? 1 : 0;
dapm_update_bits(w);
continue;
}
/* active DAC */
if (w->id == snd_soc_dapm_dac && w->active) {
out = is_connected_output_ep(w);
dapm_clear_walk(w->codec);
w->power = (out != 0) ? 1 : 0;
dapm_update_bits(w);
continue;
}
/* pre and post event widgets */
if (w->id == snd_soc_dapm_pre) {
if (!w->event)
continue;
if (event == SND_SOC_DAPM_STREAM_START) {
ret = w->event(w,
NULL, SND_SOC_DAPM_PRE_PMU);
if (ret < 0)
return ret;
} else if (event == SND_SOC_DAPM_STREAM_STOP) {
ret = w->event(w,
NULL, SND_SOC_DAPM_PRE_PMD);
if (ret < 0)
return ret;
}
continue;
}
if (w->id == snd_soc_dapm_post) {
if (!w->event)
continue;
if (event == SND_SOC_DAPM_STREAM_START) {
ret = w->event(w,
NULL, SND_SOC_DAPM_POST_PMU);
if (ret < 0)
return ret;
} else if (event == SND_SOC_DAPM_STREAM_STOP) {
ret = w->event(w,
NULL, SND_SOC_DAPM_POST_PMD);
if (ret < 0)
return ret;
}
continue;
}
/* all other widgets */
in = is_connected_input_ep(w);
dapm_clear_walk(w->codec);
out = is_connected_output_ep(w);
dapm_clear_walk(w->codec);
power = (out != 0 && in != 0) ? 1 : 0;
power_change = (w->power == power) ? 0: 1;
w->power = power;
if (!power_change)
continue;
/* call any power change event handlers */
if (w->event)
pr_debug("power %s event for %s flags %x\n",
w->power ? "on" : "off",
w->name, w->event_flags);
/* power up pre event */
if (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 (!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;
}
/* Lower PGA volume to reduce pops */
if (w->id == snd_soc_dapm_pga && !power)
dapm_set_pga(w, power);
dapm_update_bits(w);
/* Raise PGA volume to reduce pops */
if (w->id == snd_soc_dapm_pga && power)
dapm_set_pga(w, power);
/* power up post event */
if (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 (!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 ret;
}
#ifdef DEBUG
static void dbg_dump_dapm(struct snd_soc_codec* codec, const char *action)
{
struct snd_soc_dapm_widget *w;
struct snd_soc_dapm_path *p = NULL;
int in, out;
printk("DAPM %s %s\n", codec->name, action);
list_for_each_entry(w, &codec->dapm_widgets, list) {
/* only display widgets that effect routing */
switch (w->id) {
case snd_soc_dapm_pre:
case snd_soc_dapm_post:
case snd_soc_dapm_vmid:
continue;
case snd_soc_dapm_mux:
case snd_soc_dapm_output:
case snd_soc_dapm_input:
case snd_soc_dapm_switch:
case snd_soc_dapm_hp:
case snd_soc_dapm_mic:
case snd_soc_dapm_spk:
case snd_soc_dapm_line:
case snd_soc_dapm_micbias:
case snd_soc_dapm_dac:
case snd_soc_dapm_adc:
case snd_soc_dapm_pga:
case snd_soc_dapm_mixer:
if (w->name) {
in = is_connected_input_ep(w);
dapm_clear_walk(w->codec);
out = is_connected_output_ep(w);
dapm_clear_walk(w->codec);
printk("%s: %s in %d out %d\n", w->name,
w->power ? "On":"Off",in, out);
list_for_each_entry(p, &w->sources, list_sink) {
if (p->connect)
printk(" in %s %s\n", p->name ? p->name : "static",
p->source->name);
}
list_for_each_entry(p, &w->sinks, list_source) {
if (p->connect)
printk(" out %s %s\n", p->name ? p->name : "static",
p->sink->name);
}
}
break;
}
}
}
#endif
/* test and update the power status of a mux widget */
static int dapm_mux_update_power(struct snd_soc_dapm_widget *widget,
struct snd_kcontrol *kcontrol, int mask,
int mux, int val, struct soc_enum *e)
{
struct snd_soc_dapm_path *path;
int found = 0;
if (widget->id != snd_soc_dapm_mux)
return -ENODEV;
if (!snd_soc_test_bits(widget->codec, e->reg, mask, val))
return 0;
/* find dapm widget path assoc with kcontrol */
list_for_each_entry(path, &widget->codec->dapm_paths, list) {
if (path->kcontrol != kcontrol)
continue;
if (!path->name || !e->texts[mux])
continue;
found = 1;
/* we now need to match the string in the enum to the path */
if (!(strcmp(path->name, e->texts[mux])))
path->connect = 1; /* new connection */
else
path->connect = 0; /* old connection must be powered down */
}
if (found) {
dapm_power_widgets(widget->codec, SND_SOC_DAPM_STREAM_NOP);
dump_dapm(widget->codec, "mux power update");
}
return 0;
}
/* test and update the power status of a mixer or switch widget */
static int dapm_mixer_update_power(struct snd_soc_dapm_widget *widget,
struct snd_kcontrol *kcontrol, int reg,
int val_mask, int val, int invert)
{
struct snd_soc_dapm_path *path;
int found = 0;
if (widget->id != snd_soc_dapm_mixer &&
widget->id != snd_soc_dapm_switch)
return -ENODEV;
if (!snd_soc_test_bits(widget->codec, reg, val_mask, val))
return 0;
/* find dapm widget path assoc with kcontrol */
list_for_each_entry(path, &widget->codec->dapm_paths, list) {
if (path->kcontrol != kcontrol)
continue;
/* found, now check type */
found = 1;
if (val)
/* new connection */
path->connect = invert ? 0:1;
else
/* old connection must be powered down */
path->connect = invert ? 1:0;
break;
}
if (found) {
dapm_power_widgets(widget->codec, SND_SOC_DAPM_STREAM_NOP);
dump_dapm(widget->codec, "mixer power update");
}
return 0;
}
/* show dapm widget status in sys fs */
static ssize_t dapm_widget_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct snd_soc_device *devdata = dev_get_drvdata(dev);
struct snd_soc_codec *codec = devdata->codec;
struct snd_soc_dapm_widget *w;
int count = 0;
char *state = "not set";
list_for_each_entry(w, &codec->dapm_widgets, list) {
/* only display widgets that burnm power */
switch (w->id) {
case snd_soc_dapm_hp:
case snd_soc_dapm_mic:
case snd_soc_dapm_spk:
case snd_soc_dapm_line:
case snd_soc_dapm_micbias:
case snd_soc_dapm_dac:
case snd_soc_dapm_adc:
case snd_soc_dapm_pga:
case snd_soc_dapm_mixer:
if (w->name)
count += sprintf(buf + count, "%s: %s\n",
w->name, w->power ? "On":"Off");
break;
default:
break;
}
}
switch (codec->bias_level) {
case SND_SOC_BIAS_ON:
state = "On";
break;
case SND_SOC_BIAS_PREPARE:
state = "Prepare";
break;
case SND_SOC_BIAS_STANDBY:
state = "Standby";
break;
case SND_SOC_BIAS_OFF:
state = "Off";
break;
}
count += sprintf(buf + count, "PM State: %s\n", state);
return count;
}
static DEVICE_ATTR(dapm_widget, 0444, dapm_widget_show, NULL);
int snd_soc_dapm_sys_add(struct device *dev)
{
if (!dapm_status)
return 0;
return device_create_file(dev, &dev_attr_dapm_widget);
}
static void snd_soc_dapm_sys_remove(struct device *dev)
{
if (dapm_status) {
device_remove_file(dev, &dev_attr_dapm_widget);
}
}
/* free all dapm widgets and resources */
static void dapm_free_widgets(struct snd_soc_codec *codec)
{
struct snd_soc_dapm_widget *w, *next_w;
struct snd_soc_dapm_path *p, *next_p;
list_for_each_entry_safe(w, next_w, &codec->dapm_widgets, list) {
list_del(&w->list);
kfree(w);
}
list_for_each_entry_safe(p, next_p, &codec->dapm_paths, list) {
list_del(&p->list);
kfree(p->long_name);
kfree(p);
}
}
static int snd_soc_dapm_set_pin(struct snd_soc_codec *codec,
char *pin, int status)
{
struct snd_soc_dapm_widget *w;
list_for_each_entry(w, &codec->dapm_widgets, list) {
if (!strcmp(w->name, pin)) {
pr_debug("dapm: %s: pin %s\n", codec->name, pin);
w->connected = status;
return 0;
}
}
pr_err("dapm: %s: configuring unknown pin %s\n", codec->name, pin);
return -EINVAL;
}
/**
* snd_soc_dapm_sync - scan and power dapm paths
* @codec: audio codec
*
* Walks all dapm audio paths and powers widgets according to their
* stream or path usage.
*
* Returns 0 for success.
*/
int snd_soc_dapm_sync(struct snd_soc_codec *codec)
{
int ret = dapm_power_widgets(codec, SND_SOC_DAPM_STREAM_NOP);
dump_dapm(codec, "sync");
return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_sync);
static int snd_soc_dapm_add_route(struct snd_soc_codec *codec,
const char *sink, const char *control, const char *source)
{
struct snd_soc_dapm_path *path;
struct snd_soc_dapm_widget *wsource = NULL, *wsink = NULL, *w;
int ret = 0;
/* find src and dest widgets */
list_for_each_entry(w, &codec->dapm_widgets, list) {
if (!wsink && !(strcmp(w->name, sink))) {
wsink = w;
continue;
}
if (!wsource && !(strcmp(w->name, source))) {
wsource = w;
}
}
if (wsource == NULL || wsink == NULL)
return -ENODEV;
path = kzalloc(sizeof(struct snd_soc_dapm_path), GFP_KERNEL);
if (!path)
return -ENOMEM;
path->source = wsource;
path->sink = wsink;
INIT_LIST_HEAD(&path->list);
INIT_LIST_HEAD(&path->list_source);
INIT_LIST_HEAD(&path->list_sink);
/* check for external widgets */
if (wsink->id == snd_soc_dapm_input) {
if (wsource->id == snd_soc_dapm_micbias ||
wsource->id == snd_soc_dapm_mic ||
wsink->id == snd_soc_dapm_line ||
wsink->id == snd_soc_dapm_output)
wsink->ext = 1;
}
if (wsource->id == snd_soc_dapm_output) {
if (wsink->id == snd_soc_dapm_spk ||
wsink->id == snd_soc_dapm_hp ||
wsink->id == snd_soc_dapm_line ||
wsink->id == snd_soc_dapm_input)
wsource->ext = 1;
}
/* connect static paths */
if (control == NULL) {
list_add(&path->list, &codec->dapm_paths);
list_add(&path->list_sink, &wsink->sources);
list_add(&path->list_source, &wsource->sinks);
path->connect = 1;
return 0;
}
/* connect dynamic paths */
switch(wsink->id) {
case snd_soc_dapm_adc:
case snd_soc_dapm_dac:
case snd_soc_dapm_pga:
case snd_soc_dapm_input:
case snd_soc_dapm_output:
case snd_soc_dapm_micbias:
case snd_soc_dapm_vmid:
case snd_soc_dapm_pre:
case snd_soc_dapm_post:
list_add(&path->list, &codec->dapm_paths);
list_add(&path->list_sink, &wsink->sources);
list_add(&path->list_source, &wsource->sinks);
path->connect = 1;
return 0;
case snd_soc_dapm_mux:
ret = dapm_connect_mux(codec, wsource, wsink, path, control,
&wsink->kcontrols[0]);
if (ret != 0)
goto err;
break;
case snd_soc_dapm_switch:
case snd_soc_dapm_mixer:
ret = dapm_connect_mixer(codec, wsource, wsink, path, control);
if (ret != 0)
goto err;
break;
case snd_soc_dapm_hp:
case snd_soc_dapm_mic:
case snd_soc_dapm_line:
case snd_soc_dapm_spk:
list_add(&path->list, &codec->dapm_paths);
list_add(&path->list_sink, &wsink->sources);
list_add(&path->list_source, &wsource->sinks);
path->connect = 0;
return 0;
}
return 0;
err:
printk(KERN_WARNING "asoc: no dapm match for %s --> %s --> %s\n", source,
control, sink);
kfree(path);
return ret;
}
/**
* snd_soc_dapm_add_routes - Add routes between DAPM widgets
* @codec: codec
* @route: audio routes
* @num: number of routes
*
* Connects 2 dapm widgets together via a named audio path. The sink is
* the widget receiving the audio signal, whilst the source is the sender