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ASoC: rt5640: Add button press support 

Enable button press detection for headsets by using the ovcd IRQ to get
notified of button presses.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Hans de Goede 2018-05-08 17:35:52 +02:00 committed by Mark Brown
parent 8210804bcf
commit b16188a20f
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 159 additions and 7 deletions
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157
sound/soc/codecs/rt5640.c
View File

@ -2119,6 +2119,24 @@ static void rt5640_disable_micbias1_for_ovcd(struct snd_soc_component *component
snd_soc_dapm_mutex_unlock(dapm);
}
static void rt5640_enable_micbias1_ovcd_irq(struct snd_soc_component *component)
{
struct rt5640_priv *rt5640 = snd_soc_component_get_drvdata(component);
snd_soc_component_update_bits(component, RT5640_IRQ_CTRL2,
RT5640_IRQ_MB1_OC_MASK, RT5640_IRQ_MB1_OC_NOR);
rt5640->ovcd_irq_enabled = true;
}
static void rt5640_disable_micbias1_ovcd_irq(struct snd_soc_component *component)
{
struct rt5640_priv *rt5640 = snd_soc_component_get_drvdata(component);
snd_soc_component_update_bits(component, RT5640_IRQ_CTRL2,
RT5640_IRQ_MB1_OC_MASK, RT5640_IRQ_MB1_OC_BP);
rt5640->ovcd_irq_enabled = false;
}
static void rt5640_clear_micbias1_ovcd(struct snd_soc_component *component)
{
snd_soc_component_update_bits(component, RT5640_IRQ_CTRL2,
@ -2149,10 +2167,80 @@ static bool rt5640_jack_inserted(struct snd_soc_component *component)
return (val & RT5640_JD_STATUS);
}
/* Jack detect timings */
/* Jack detect and button-press timings */
#define JACK_SETTLE_TIME 100 /* milli seconds */
#define JACK_DETECT_COUNT 5
#define JACK_DETECT_MAXCOUNT 20 /* Aprox. 2 seconds worth of tries */
#define JACK_UNPLUG_TIME 80 /* milli seconds */
#define BP_POLL_TIME 10 /* milli seconds */
#define BP_POLL_MAXCOUNT 200 /* assume something is wrong after this */
#define BP_THRESHOLD 3
static void rt5640_start_button_press_work(struct snd_soc_component *component)
{
struct rt5640_priv *rt5640 = snd_soc_component_get_drvdata(component);
rt5640->poll_count = 0;
rt5640->press_count = 0;
rt5640->release_count = 0;
rt5640->pressed = false;
rt5640->press_reported = false;
rt5640_clear_micbias1_ovcd(component);
schedule_delayed_work(&rt5640->bp_work, msecs_to_jiffies(BP_POLL_TIME));
}
static void rt5640_button_press_work(struct work_struct *work)
{
struct rt5640_priv *rt5640 =
container_of(work, struct rt5640_priv, bp_work.work);
struct snd_soc_component *component = rt5640->component;
/* Check the jack was not removed underneath us */
if (!rt5640_jack_inserted(component))
return;
if (rt5640_micbias1_ovcd(component)) {
rt5640->release_count = 0;
rt5640->press_count++;
/* Remember till after JACK_UNPLUG_TIME wait */
if (rt5640->press_count >= BP_THRESHOLD)
rt5640->pressed = true;
rt5640_clear_micbias1_ovcd(component);
} else {
rt5640->press_count = 0;
rt5640->release_count++;
}
/*
* The pins get temporarily shorted on jack unplug, so we poll for
* at least JACK_UNPLUG_TIME milli-seconds before reporting a press.
*/
rt5640->poll_count++;
if (rt5640->poll_count < (JACK_UNPLUG_TIME / BP_POLL_TIME)) {
schedule_delayed_work(&rt5640->bp_work,
msecs_to_jiffies(BP_POLL_TIME));
return;
}
if (rt5640->pressed && !rt5640->press_reported) {
dev_dbg(component->dev, "headset button press\n");
snd_soc_jack_report(rt5640->jack, SND_JACK_BTN_0,
SND_JACK_BTN_0);
rt5640->press_reported = true;
}
if (rt5640->release_count >= BP_THRESHOLD) {
if (rt5640->press_reported) {
dev_dbg(component->dev, "headset button release\n");
snd_soc_jack_report(rt5640->jack, 0, SND_JACK_BTN_0);
}
/* Re-enable OVCD IRQ to detect next press */
rt5640_enable_micbias1_ovcd_irq(component);
return; /* Stop polling */
}
schedule_delayed_work(&rt5640->bp_work, msecs_to_jiffies(BP_POLL_TIME));
}
static int rt5640_detect_headset(struct snd_soc_component *component)
{
@ -2209,17 +2297,51 @@ static void rt5640_jack_work(struct work_struct *work)
if (!rt5640_jack_inserted(component)) {
/* Jack removed, or spurious IRQ? */
if (rt5640->jack->status & SND_JACK_HEADPHONE) {
snd_soc_jack_report(rt5640->jack, 0, SND_JACK_HEADSET);
if (rt5640->jack->status & SND_JACK_MICROPHONE) {
cancel_delayed_work_sync(&rt5640->bp_work);
rt5640_disable_micbias1_ovcd_irq(component);
rt5640_disable_micbias1_for_ovcd(component);
}
snd_soc_jack_report(rt5640->jack, 0,
SND_JACK_HEADSET | SND_JACK_BTN_0);
dev_dbg(component->dev, "jack unplugged\n");
}
} else if (!(rt5640->jack->status & SND_JACK_HEADPHONE)) {
/* Jack inserted */
WARN_ON(rt5640->ovcd_irq_enabled);
rt5640_enable_micbias1_for_ovcd(component);
status = rt5640_detect_headset(component);
rt5640_disable_micbias1_for_ovcd(component);
if (status == SND_JACK_HEADSET) {
/* Enable ovcd IRQ for button press detect. */
rt5640_enable_micbias1_ovcd_irq(component);
} else {
/* No more need for overcurrent detect. */
rt5640_disable_micbias1_for_ovcd(component);
}
dev_dbg(component->dev, "detect status %#02x\n", status);
snd_soc_jack_report(rt5640->jack, status, SND_JACK_HEADSET);
} else if (rt5640->ovcd_irq_enabled && rt5640_micbias1_ovcd(component)) {
dev_dbg(component->dev, "OVCD IRQ\n");
/*
* The ovcd IRQ keeps firing while the button is pressed, so
* we disable it and start polling the button until released.
*
* The disable will make the IRQ pin 0 again and since we get
* IRQs on both edges (so as to detect both jack plugin and
* unplug) this means we will immediately get another IRQ.
* The ovcd_irq_enabled check above makes the 2ND IRQ a NOP.
*/
rt5640_disable_micbias1_ovcd_irq(component);
rt5640_start_button_press_work(component);
/*
* If the jack-detect IRQ flag goes high (unplug) after our
* above rt5640_jack_inserted() check and before we have
* disabled the OVCD IRQ, the IRQ pin will stay high and as
* we react to edges, we miss the unplug event -> recheck.
*/
queue_work(system_long_wq, &rt5640->jack_work);
}
}
@ -2238,6 +2360,7 @@ static void rt5640_cancel_work(void *data)
struct rt5640_priv *rt5640 = data;
cancel_work_sync(&rt5640->jack_work);
cancel_delayed_work_sync(&rt5640->bp_work);
}
static void rt5640_enable_jack_detect(struct snd_soc_component *component,
@ -2282,10 +2405,25 @@ static void rt5640_enable_jack_detect(struct snd_soc_component *component,
snd_soc_component_update_bits(component, RT5640_IRQ_CTRL2,
RT5640_MB1_OC_STKY_MASK, RT5640_MB1_OC_STKY_EN);
snd_soc_component_write(component, RT5640_IRQ_CTRL1,
RT5640_IRQ_JD_NOR);
/*
* All IRQs get or-ed together, so we need the jack IRQ to report 0
* when a jack is inserted so that the OVCD IRQ then toggles the IRQ
* pin 0/1 instead of it being stuck to 1. So we invert the JD polarity
* on systems where the hardware does not already do this.
*/
if (rt5640->jd_inverted)
snd_soc_component_write(component, RT5640_IRQ_CTRL1,
RT5640_IRQ_JD_NOR);
else
snd_soc_component_write(component, RT5640_IRQ_CTRL1,
RT5640_IRQ_JD_NOR | RT5640_JD_P_INV);
rt5640->jack = jack;
if (rt5640->jack->status & SND_JACK_MICROPHONE) {
rt5640_enable_micbias1_for_ovcd(component);
rt5640_enable_micbias1_ovcd_irq(component);
}
enable_irq(rt5640->irq);
/* sync initial jack state */
queue_work(system_long_wq, &rt5640->jack_work);
@ -2298,6 +2436,12 @@ static void rt5640_disable_jack_detect(struct snd_soc_component *component)
disable_irq(rt5640->irq);
rt5640_cancel_work(rt5640);
if (rt5640->jack->status & SND_JACK_MICROPHONE) {
rt5640_disable_micbias1_ovcd_irq(component);
rt5640_disable_micbias1_for_ovcd(component);
snd_soc_jack_report(rt5640->jack, 0, SND_JACK_BTN_0);
}
rt5640->jack = NULL;
}
@ -2677,6 +2821,7 @@ static int rt5640_i2c_probe(struct i2c_client *i2c,
rt5640->hp_mute = 1;
rt5640->irq = i2c->irq;
INIT_DELAYED_WORK(&rt5640->bp_work, rt5640_button_press_work);
INIT_WORK(&rt5640->jack_work, rt5640_jack_work);
/* Make sure work is stopped on probe-error / remove */

9
sound/soc/codecs/rt5640.h
View File

@ -2139,7 +2139,14 @@ struct rt5640_priv {
bool hp_mute;
bool asrc_en;
/* Jack detect data */
/* Jack and button detect data */
bool ovcd_irq_enabled;
bool pressed;
bool press_reported;
int press_count;
int release_count;
int poll_count;
struct delayed_work bp_work;
struct work_struct jack_work;
struct snd_soc_jack *jack;
unsigned int jd_src;