soc-dapm.c

linux 内核源代码

			path->walked = 1;
			con += is_connected_input_ep(path->source);
		}
	}

	return con;
}

/*
 * 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;
			}

			/* programmable gain/attenuation */
			if (w->id == snd_soc_dapm_pga) {
				int on;
				in = is_connected_input_ep(w);
				dapm_clear_walk(w->codec);
				out = is_connected_output_ep(w);
				dapm_clear_walk(w->codec);
				w->power = on = (out != 0 && in != 0) ? 1 : 0;

				if (!on)
					dapm_set_pga(w, on); /* lower volume to reduce pops */
				dapm_update_bits(w);
				if (on)
					dapm_set_pga(w, on); /* restore volume from zero */

				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, SND_SOC_DAPM_PRE_PMU);
					if (ret < 0)
						return ret;
				} else if (event == SND_SOC_DAPM_STREAM_STOP) {
					ret = w->event(w, 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, SND_SOC_DAPM_POST_PMU);
					if (ret < 0)
						return ret;
				} else if (event == SND_SOC_DAPM_STREAM_STOP) {
					ret = w->event(w, 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;

			/* call any power change event handlers */
			if (power_change) {
				if (w->event) {
					dbg("power %s event for %s flags %x\n",
						w->power ? "on" : "off", w->name, w->event_flags);
					if (power) {
						/* power up event */
						if (w->event_flags & SND_SOC_DAPM_PRE_PMU) {
							ret = w->event(w, SND_SOC_DAPM_PRE_PMU);
							if (ret < 0)
								return ret;
						}
						dapm_update_bits(w);
						if (w->event_flags & SND_SOC_DAPM_POST_PMU){
							ret = w->event(w, SND_SOC_DAPM_POST_PMU);
							if (ret < 0)
								return ret;
						}
					} else {
						/* power down event */
						if (w->event_flags & SND_SOC_DAPM_PRE_PMD) {
							ret = w->event(w, SND_SOC_DAPM_PRE_PMD);
							if (ret < 0)
								return ret;
						}
						dapm_update_bits(w);
						if (w->event_flags & SND_SOC_DAPM_POST_PMD) {
							ret = w->event(w, SND_SOC_DAPM_POST_PMD);
							if (ret < 0)
								return ret;
						}
					}
				} else
					/* no event handler */
					dapm_update_bits(w);
			}
		}
	}

	return ret;
}

#if DAPM_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 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[val])
			continue;

		found = 1;
		/* we now need to match the string in the enum to the path */
		if (!(strcmp(path->name, e->texts[val])))
			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);

	return 0;
}

/* test and update the power status of a mixer 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)
		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);

	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->dapm_state){
	case SNDRV_CTL_POWER_D0:
		state = "D0";
		break;
	case SNDRV_CTL_POWER_D1:
		state = "D1";
		break;
	case SNDRV_CTL_POWER_D2:
		state = "D2";
		break;
	case SNDRV_CTL_POWER_D3hot:
		state = "D3hot";
		break;
	case SNDRV_CTL_POWER_D3cold:
		state = "D3cold";
		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)
{
	int ret = 0;

	if (dapm_status)
		ret = device_create_file(dev, &dev_attr_dapm_widget);

	return ret;
}

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);
	}
}

/**
 * snd_soc_dapm_sync_endpoints - 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_endpoints(struct snd_soc_codec *codec)
{
	return dapm_power_widgets(codec, SND_SOC_DAPM_STREAM_NOP);
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_sync_endpoints);

/**
 * snd_soc_dapm_connect_input - connect dapm widgets
 * @codec: audio codec
 * @sink: name of target widget
 * @control: mixer control name
 * @source: name of source name
 *
 * 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
 * of the audio signal.
 *
 * Returns 0 for success else error.
 */
int snd_soc_dapm_connect_input(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 ||