Release 4.7 sound/soc/soc-dapm.c

/*
 * soc-dapm.c  --  ALSA SoC Dynamic Audio Power Management
 *
 * Copyright 2005 Wolfson Microelectronics PLC.
 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
 *
 *  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/headphone insertion events.
 *    o Automatic Mic Bias support
 *    o Jack insertion power event initiation - e.g. hp insertion will enable
 *      sinks, dacs, etc
 *    o Delayed power down of audio subsystem to reduce pops between a quick
 *      device reopen.
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/async.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/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/clk.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>


#define DAPM_UPDATE_STAT(widget, val) widget->dapm->card->dapm_stats.val++;


#define SND_SOC_DAPM_DIR_REVERSE(x) ((x == SND_SOC_DAPM_DIR_IN) ? \
        SND_SOC_DAPM_DIR_OUT : SND_SOC_DAPM_DIR_IN)


#define snd_soc_dapm_for_each_direction(dir) \
	for ((dir) = SND_SOC_DAPM_DIR_IN; (dir) <= SND_SOC_DAPM_DIR_OUT; \
                (dir)++)

static int snd_soc_dapm_add_path(struct snd_soc_dapm_context *dapm,
	struct snd_soc_dapm_widget *wsource, struct snd_soc_dapm_widget *wsink,
	const char *control,
	int (*connected)(struct snd_soc_dapm_widget *source,
			 struct snd_soc_dapm_widget *sink));

struct snd_soc_dapm_widget *
snd_soc_dapm_new_control(struct snd_soc_dapm_context *dapm,
			 const struct snd_soc_dapm_widget *widget);

struct snd_soc_dapm_widget *
snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
			 const struct snd_soc_dapm_widget *widget);

/* dapm power sequences - make this per codec in the future */

static int dapm_up_seq[] = {
	[snd_soc_dapm_pre] = 0,
	[snd_soc_dapm_regulator_supply] = 1,
	[snd_soc_dapm_clock_supply] = 1,
	[snd_soc_dapm_supply] = 2,
	[snd_soc_dapm_micbias] = 3,
	[snd_soc_dapm_dai_link] = 2,
	[snd_soc_dapm_dai_in] = 4,
	[snd_soc_dapm_dai_out] = 4,
	[snd_soc_dapm_aif_in] = 4,
	[snd_soc_dapm_aif_out] = 4,
	[snd_soc_dapm_mic] = 5,
	[snd_soc_dapm_mux] = 6,
	[snd_soc_dapm_demux] = 6,
	[snd_soc_dapm_dac] = 7,
	[snd_soc_dapm_switch] = 8,
	[snd_soc_dapm_mixer] = 8,
	[snd_soc_dapm_mixer_named_ctl] = 8,
	[snd_soc_dapm_pga] = 9,
	[snd_soc_dapm_adc] = 10,
	[snd_soc_dapm_out_drv] = 11,
	[snd_soc_dapm_hp] = 11,
	[snd_soc_dapm_spk] = 11,
	[snd_soc_dapm_line] = 11,
	[snd_soc_dapm_kcontrol] = 12,
	[snd_soc_dapm_post] = 13,
};


static int dapm_down_seq[] = {
	[snd_soc_dapm_pre] = 0,
	[snd_soc_dapm_kcontrol] = 1,
	[snd_soc_dapm_adc] = 2,
	[snd_soc_dapm_hp] = 3,
	[snd_soc_dapm_spk] = 3,
	[snd_soc_dapm_line] = 3,
	[snd_soc_dapm_out_drv] = 3,
	[snd_soc_dapm_pga] = 4,
	[snd_soc_dapm_switch] = 5,
	[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_demux] = 9,
	[snd_soc_dapm_aif_in] = 10,
	[snd_soc_dapm_aif_out] = 10,
	[snd_soc_dapm_dai_in] = 10,
	[snd_soc_dapm_dai_out] = 10,
	[snd_soc_dapm_dai_link] = 11,
	[snd_soc_dapm_supply] = 12,
	[snd_soc_dapm_clock_supply] = 13,
	[snd_soc_dapm_regulator_supply] = 13,
	[snd_soc_dapm_post] = 14,
};



static void dapm_assert_locked(struct snd_soc_dapm_context *dapm)
{
	if (dapm->card && dapm->card->instantiated)
		lockdep_assert_held(&dapm->card->dapm_mutex);
}

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static void pop_wait(u32 pop_time)
{
	if (pop_time)
		schedule_timeout_uninterruptible(msecs_to_jiffies(pop_time));
}

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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);
}

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static bool dapm_dirty_widget(struct snd_soc_dapm_widget *w)
{
	return !list_empty(&w->dirty);
}

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static void dapm_mark_dirty(struct snd_soc_dapm_widget *w, const char *reason)
{
	dapm_assert_locked(w->dapm);

	if (!dapm_dirty_widget(w)) {
		dev_vdbg(w->dapm->dev, "Marking %s dirty due to %s\n",
			 w->name, reason);
		list_add_tail(&w->dirty, &w->dapm->card->dapm_dirty);
	}
}

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/*
 * Common implementation for dapm_widget_invalidate_input_paths() and
 * dapm_widget_invalidate_output_paths(). The function is inlined since the
 * combined size of the two specialized functions is only marginally larger then
 * the size of the generic function and at the same time the fast path of the
 * specialized functions is significantly smaller than the generic function.
 */


static __always_inline void dapm_widget_invalidate_paths(
	struct snd_soc_dapm_widget *w, enum snd_soc_dapm_direction dir)
{
	enum snd_soc_dapm_direction rdir = SND_SOC_DAPM_DIR_REVERSE(dir);
	struct snd_soc_dapm_widget *node;
	struct snd_soc_dapm_path *p;
	LIST_HEAD(list);

	dapm_assert_locked(w->dapm);

	if (w->endpoints[dir] == -1)
		return;

	list_add_tail(&w->work_list, &list);
	w->endpoints[dir] = -1;

	list_for_each_entry(w, &list, work_list) {
		snd_soc_dapm_widget_for_each_path(w, dir, p) {
			if (p->is_supply || p->weak || !p->connect)
				continue;
			node = p->node[rdir];
			if (node->endpoints[dir] != -1) {
				node->endpoints[dir] = -1;
				list_add_tail(&node->work_list, &list);
			}
		}
	}
}

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/*
 * dapm_widget_invalidate_input_paths() - Invalidate the cached number of
 *  input paths
 * @w: The widget for which to invalidate the cached number of input paths
 *
 * Resets the cached number of inputs for the specified widget and all widgets
 * that can be reached via outcoming paths from the widget.
 *
 * This function must be called if the number of output paths for a widget might
 * have changed. E.g. if the source state of a widget changes or a path is added
 * or activated with the widget as the sink.
 */


static void dapm_widget_invalidate_input_paths(struct snd_soc_dapm_widget *w)
{
	dapm_widget_invalidate_paths(w, SND_SOC_DAPM_DIR_IN);
}

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/*
 * dapm_widget_invalidate_output_paths() - Invalidate the cached number of
 *  output paths
 * @w: The widget for which to invalidate the cached number of output paths
 *
 * Resets the cached number of outputs for the specified widget and all widgets
 * that can be reached via incoming paths from the widget.
 *
 * This function must be called if the number of output paths for a widget might
 * have changed. E.g. if the sink state of a widget changes or a path is added
 * or activated with the widget as the source.
 */


static void dapm_widget_invalidate_output_paths(struct snd_soc_dapm_widget *w)
{
	dapm_widget_invalidate_paths(w, SND_SOC_DAPM_DIR_OUT);
}

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/*
 * dapm_path_invalidate() - Invalidates the cached number of inputs and outputs
 *  for the widgets connected to a path
 * @p: The path to invalidate
 *
 * Resets the cached number of inputs for the sink of the path and the cached
 * number of outputs for the source of the path.
 *
 * This function must be called when a path is added, removed or the connected
 * state changes.
 */


static void dapm_path_invalidate(struct snd_soc_dapm_path *p)
{
	/*
         * Weak paths or supply paths do not influence the number of input or
         * output paths of their neighbors.
         */
	if (p->weak || p->is_supply)
		return;

	/*
         * The number of connected endpoints is the sum of the number of
         * connected endpoints of all neighbors. If a node with 0 connected
         * endpoints is either connected or disconnected that sum won't change,
         * so there is no need to re-check the path.
         */
	if (p->source->endpoints[SND_SOC_DAPM_DIR_IN] != 0)
		dapm_widget_invalidate_input_paths(p->sink);
	if (p->sink->endpoints[SND_SOC_DAPM_DIR_OUT] != 0)
		dapm_widget_invalidate_output_paths(p->source);
}

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void dapm_mark_endpoints_dirty(struct snd_soc_card *card)
{
	struct snd_soc_dapm_widget *w;

	mutex_lock(&card->dapm_mutex);

	list_for_each_entry(w, &card->widgets, list) {
		if (w->is_ep) {
			dapm_mark_dirty(w, "Rechecking endpoints");
			if (w->is_ep & SND_SOC_DAPM_EP_SINK)
				dapm_widget_invalidate_output_paths(w);
			if (w->is_ep & SND_SOC_DAPM_EP_SOURCE)
				dapm_widget_invalidate_input_paths(w);
		}
	}

	mutex_unlock(&card->dapm_mutex);
}
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EXPORT_SYMBOL_GPL(dapm_mark_endpoints_dirty);

/* 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);
}

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struct dapm_kcontrol_data {
	
unsigned int value;
	
struct snd_soc_dapm_widget *widget;
	
struct list_head paths;
	
struct snd_soc_dapm_widget_list *wlist;
};



static int dapm_kcontrol_data_alloc(struct snd_soc_dapm_widget *widget,
	struct snd_kcontrol *kcontrol, const char *ctrl_name)
{
	struct dapm_kcontrol_data *data;
	struct soc_mixer_control *mc;
	struct soc_enum *e;
	const char *name;
	int ret;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	INIT_LIST_HEAD(&data->paths);

	switch (widget->id) {
	case snd_soc_dapm_switch:
	case snd_soc_dapm_mixer:
	case snd_soc_dapm_mixer_named_ctl:
		mc = (struct soc_mixer_control *)kcontrol->private_value;

		if (mc->autodisable) {
			struct snd_soc_dapm_widget template;

			name = kasprintf(GFP_KERNEL, "%s %s", ctrl_name,
					 "Autodisable");
			if (!name) {
				ret = -ENOMEM;
				goto err_data;
			}

			memset(&template, 0, sizeof(template));
			template.reg = mc->reg;
			template.mask = (1 << fls(mc->max)) - 1;
			template.shift = mc->shift;
			if (mc->invert)
				template.off_val = mc->max;
			else
				template.off_val = 0;
			template.on_val = template.off_val;
			template.id = snd_soc_dapm_kcontrol;
			template.name = name;

			data->value = template.on_val;

			data->widget =
				snd_soc_dapm_new_control_unlocked(widget->dapm,
				&template);
			kfree(name);
			if (!data->widget) {
				ret = -ENOMEM;
				goto err_data;
			}
		}
		break;
	case snd_soc_dapm_demux:
	case snd_soc_dapm_mux:
		e = (struct soc_enum *)kcontrol->private_value;

		if (e->autodisable) {
			struct snd_soc_dapm_widget template;

			name = kasprintf(GFP_KERNEL, "%s %s", ctrl_name,
					 "Autodisable");
			if (!name) {
				ret = -ENOMEM;
				goto err_data;
			}

			memset(&template, 0, sizeof(template));
			template.reg = e->reg;
			template.mask = e->mask << e->shift_l;
			template.shift = e->shift_l;
			template.off_val = snd_soc_enum_item_to_val(e, 0);
			template.on_val = template.off_val;
			template.id = snd_soc_dapm_kcontrol;
			template.name = name;

			data->value = template.on_val;

			data->widget = snd_soc_dapm_new_control_unlocked(
						widget->dapm, &template);
			kfree(name);
			if (!data->widget) {
				ret = -ENOMEM;
				goto err_data;
			}

			snd_soc_dapm_add_path(widget->dapm, data->widget,
					      widget, NULL, NULL);
		}
		break;
	default:
		break;
	}

	kcontrol->private_data = data;

	return 0;

err_data:
	kfree(data);
	return ret;
}

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static void dapm_kcontrol_free(struct snd_kcontrol *kctl)
{
	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kctl);
	kfree(data->wlist);
	kfree(data);
}

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static struct snd_soc_dapm_widget_list *dapm_kcontrol_get_wlist(
	const struct snd_kcontrol *kcontrol)
{
	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);

	return data->wlist;
}

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static int dapm_kcontrol_add_widget(struct snd_kcontrol *kcontrol,
	struct snd_soc_dapm_widget *widget)
{
	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
	struct snd_soc_dapm_widget_list *new_wlist;
	unsigned int n;

	if (data->wlist)
		n = data->wlist->num_widgets + 1;
	else
		n = 1;

	new_wlist = krealloc(data->wlist,
			sizeof(*new_wlist) + sizeof(widget) * n, GFP_KERNEL);
	if (!new_wlist)
		return -ENOMEM;

	new_wlist->widgets[n - 1] = widget;
	new_wlist->num_widgets = n;

	data->wlist = new_wlist;

	return 0;
}

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static void dapm_kcontrol_add_path(const struct snd_kcontrol *kcontrol,
	struct snd_soc_dapm_path *path)
{
	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);

	list_add_tail(&path->list_kcontrol, &data->paths);
}

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static bool dapm_kcontrol_is_powered(const struct snd_kcontrol *kcontrol)
{
	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);

	if (!data->widget)
		return true;

	return data->widget->power;
}

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static struct list_head *dapm_kcontrol_get_path_list(
	const struct snd_kcontrol *kcontrol)
{
	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);

	return &data->paths;
}

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#define dapm_kcontrol_for_each_path(path, kcontrol) \
	list_for_each_entry(path, dapm_kcontrol_get_path_list(kcontrol), \
                list_kcontrol)



unsigned int dapm_kcontrol_get_value(const struct snd_kcontrol *kcontrol)
{
	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);

	return data->value;
}
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EXPORT_SYMBOL_GPL(dapm_kcontrol_get_value);



static bool dapm_kcontrol_set_value(const struct snd_kcontrol *kcontrol,
	unsigned int value)
{
	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);

	if (data->value == value)
		return false;

	if (data->widget)
		data->widget->on_val = value;

	data->value = value;

	return true;
}

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/**
 * snd_soc_dapm_kcontrol_widget() - Returns the widget associated to a
 *   kcontrol
 * @kcontrol: The kcontrol
 */


struct snd_soc_dapm_widget *snd_soc_dapm_kcontrol_widget(
				struct snd_kcontrol *kcontrol)
{
	return dapm_kcontrol_get_wlist(kcontrol)->widgets[0];
}
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EXPORT_SYMBOL_GPL(snd_soc_dapm_kcontrol_widget);

/**
 * snd_soc_dapm_kcontrol_dapm() - Returns the dapm context associated to a
 *  kcontrol
 * @kcontrol: The kcontrol
 *
 * Note: This function must only be used on kcontrols that are known to have
 * been registered for a CODEC. Otherwise the behaviour is undefined.
 */


struct snd_soc_dapm_context *snd_soc_dapm_kcontrol_dapm(
	struct snd_kcontrol *kcontrol)
{
	return dapm_kcontrol_get_wlist(kcontrol)->widgets[0]->dapm;
}
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lars-peter clausen
lars-peter clausen
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EXPORT_SYMBOL_GPL(snd_soc_dapm_kcontrol_dapm);



static void dapm_reset(struct snd_soc_card *card)
{
	struct snd_soc_dapm_widget *w;

	lockdep_assert_held(&card->dapm_mutex);

	memset(&card->dapm_stats, 0, sizeof(card->dapm_stats));

	list_for_each_entry(w, &card->widgets, list) {
		w->new_power = w->power;
		w->power_checked = false;
	}
}

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liam girdwood
liam girdwood
49
75.38%
1
33.33%
lars-peter clausen
lars-peter clausen
8
12.31%
1
33.33%
mark brown
mark brown
8
12.31%
1
33.33%
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65
100.00%
3
100.00%



static const char *soc_dapm_prefix(struct snd_soc_dapm_context *dapm)
{
	if (!dapm->component)
		return NULL;
	return dapm->component->name_prefix;
}

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lars-peter clausen
lars-peter clausen
30
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1
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30
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1
100.00%



static int soc_dapm_read(struct snd_soc_dapm_context *dapm, int reg,
	unsigned int *value)
{
	if (!dapm->component)
		return -EIO;
	return snd_soc_component_read(dapm->component, reg, value);
}

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liam girdwood
liam girdwood
22
52.38%
2
40.00%
lars-peter clausen
lars-peter clausen
14
33.33%
2
40.00%
arun shamanna lakshmi
arun shamanna lakshmi
6
14.29%
1
20.00%
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42
100.00%
5
100.00%



static int soc_dapm_update_bits(struct snd_soc_dapm_context *dapm,
	int reg, unsigned int mask, unsigned int value)
{
	if (!dapm->component)
		return -EIO;
	return snd_soc_component_update_bits(dapm->component, reg,
					     mask, value);
}

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lars-peter clausen
lars-peter clausen
27
57.45%
3
50.00%
liam girdwood
liam girdwood
19
40.43%
2
33.33%
mark brown
mark brown
1
2.13%
1
16.67%
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47
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6
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static int soc_dapm_test_bits(struct snd_soc_dapm_context *dapm,
	int reg, unsigned int mask, unsigned int value)
{
	if (!dapm->component)
		return -EIO;
	return snd_soc_component_test_bits(dapm->component, reg, mask, value);
}

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lars-peter clausen
lars-peter clausen
39
82.98%
2
50.00%
liam girdwood
liam girdwood
8
17.02%
2
50.00%
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47
100.00%
4
100.00%



static void soc_dapm_async_complete(struct snd_soc_dapm_context *dapm)
{
	if (dapm->component)
		snd_soc_component_async_complete(dapm->component);
}

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mark brown
mark brown
20
83.33%
2
50.00%
lars-peter clausen
lars-peter clausen
3
12.50%
1
25.00%
liam girdwood
liam girdwood
1
4.17%
1
25.00%
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24
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4
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static struct snd_soc_dapm_widget *

dapm_wcache_lookup(struct snd_soc_dapm_wcache *wcache, const char *name)
{
	struct snd_soc_dapm_widget *w = wcache->widget;
	struct list_head *wlist;
	const int depth = 2;
	int i = 0;

	if (w) {
		wlist = &w->dapm->card->widgets;

		list_for_each_entry_from(w, wlist, list) {
			if (!strcmp(name, w->name))
				return w;

			if (++i == depth)
				break;
		}
	}

	return NULL;
}

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charles keepax
charles keepax
96
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1
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96
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1
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static inline void dapm_wcache_update(struct snd_soc_dapm_wcache *wcache,
				      struct snd_soc_dapm_widget *w)
{
	wcache->widget = w;
}

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charles keepax
charles keepax
14
60.87%
1
25.00%
lars-peter clausen
lars-peter clausen
8
34.78%
2
50.00%
liam girdwood
liam girdwood
1
4.35%
1
25.00%
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23
100.00%
4
100.00%

/**
 * snd_soc_dapm_force_bias_level() - Sets the DAPM bias level
 * @dapm: The DAPM context for which to set the level
 * @level: The level to set
 *
 * Forces the DAPM bias level to a specific state. It will call the bias level
 * callback of DAPM context with the specified level. This will even happen if
 * the context is already at the same level. Furthermore it will not go through
 * the normal bias level sequencing, meaning any intermediate states between the
 * current and the target state will not be entered.
 *
 * Note that the change in bias level is only temporary and the next time
 * snd_soc_dapm_sync() is called the state will be set to the level as
 * determined by the DAPM core. The function is mainly intended to be used to
 * used during probe or resume from suspend to power up the device so
 * initialization can be done, before the DAPM core takes over.
 */


int snd_soc_dapm_force_bias_level(struct snd_soc_dapm_context *dapm,
	enum snd_soc_bias_level level)
{
	int ret = 0;

	if (dapm->set_bias_level)
		ret = dapm->set_bias_level(dapm, level);

	if (ret == 0)
		dapm->bias_level = level;

	return ret;
}
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lars-peter clausen
lars-peter clausen
34
66.67%
2
40.00%
mark brown
mark brown
16
31.37%
2
40.00%
liam girdwood
liam girdwood
1
1.96%
1
20.00%
Total
51
100.00%
5
100.00%


EXPORT_SYMBOL_GPL(snd_soc_dapm_force_bias_level);

/**
 * snd_soc_dapm_set_bias_level - set the bias level for the system
 * @dapm: DAPM context
 * @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_dapm_context *dapm,
				       enum snd_soc_bias_level level)
{
	struct snd_soc_card *card = dapm->card;
	int ret = 0;

	trace_snd_soc_bias_level_start(card, level);

	if (card && card->set_bias_level)
		ret = card->set_bias_level(card, dapm, level);
	if (ret != 0)
		goto out;

	if (!card || dapm != &card->dapm)
		ret = snd_soc_dapm_force_bias_level(dapm, level);

	if (ret != 0)
		goto out;

	if (card && card->set_bias_level_post)
		ret = card->set_bias_level_post(card, dapm, level);
out:
	trace_snd_soc_bias_level_done(card, level);

	return ret;
}

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mark brown
mark brown
113
87.60%
8
72.73%
liam girdwood
liam girdwood
10
7.75%
2
18.18%
lars-peter clausen
lars-peter clausen
6
4.65%
1
9.09%
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129
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11
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/* connect mux widget to its interconnecting audio paths */


static int dapm_connect_mux(struct snd_soc_dapm_context *dapm,
	struct snd_soc_dapm_path *path, const char *control_name,
	struct snd_soc_dapm_widget *w)
{
	const struct snd_kcontrol_new *kcontrol = &w->kcontrol_news[0];
	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
	unsigned int val, item;
	int i;

	if (e->reg != SND_SOC_NOPM) {
		soc_dapm_read(dapm, e->reg, &val);
		val = (val >> e->shift_l) & e->mask;
		item = snd_soc_enum_val_to_item(e, val);
	} else {
		/* 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.
                 */
		item = 0;
	}

	for (i = 0; i < e->items; i++) {
		if (!(strcmp(control_name, e->texts[i]))) {
			path->name = e->texts[i];
			if (i == item)
				path->connect = 1;
			else
				path->connect = 0;
			return 0;
		}
	}

	return -ENODEV;
}

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richard purdie
richard purdie
96
50.79%
1
6.67%
lars-peter clausen
lars-peter clausen
65
34.39%
7
46.67%
dimitris papastamos
dimitris papastamos
12
6.35%
1
6.67%
jon smirl
jon smirl
9
4.76%
2
13.33%
arun shamanna lakshmi
arun shamanna lakshmi
3
1.59%
1
6.67%
liam girdwood
liam girdwood
2
1.06%
1
6.67%
benoit thebaudeau
benoit thebaudeau
1
0.53%
1
6.67%
takashi iwai
takashi iwai
1
0.53%
1
6.67%
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189
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15
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/* set up initial codec paths */


static void dapm_set_mixer_path_status(struct snd_soc_dapm_path *p, int i)
{
	struct soc_mixer_control *mc = (struct soc_mixer_control *)
		p->sink->kcontrol_news[