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linux/sound/soc/codecs/ts3a227e.c
Benson Leung af0f6c5820
ASoC: ts3a227e: Map BTN_0 to KEY_PLAYPAUSE 
The Android 3.5mm Headset jack specification mentions that BTN_0 should
be mapped to KEY_MEDIA, but this is less logical than KEY_PLAYPAUSE,
which has much broader userspace support.

For example, the Chrome OS userspace now supports KEY_PLAYPAUSE to toggle
play/pause of videos and audio, but does not handle KEY_MEDIA.

Furthermore, Android itself now supports KEY_PLAYPAUSE equivalently, as the
new USB headset spec requires KEY_PLAYPAUSE for BTN_0.
https://source.android.com/devices/accessories/headset/usb-headset-spec

Signed-off-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
2017-11-27 13:01:38 +00:00

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/*
* TS3A227E Autonomous Audio Accessory Detection and Configuration Switch
*
* Copyright (C) 2014 Google, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/regmap.h>
#include <linux/acpi.h>
#include <sound/core.h>
#include <sound/jack.h>
#include <sound/soc.h>
#include "ts3a227e.h"
struct ts3a227e {
struct device *dev;
struct regmap *regmap;
struct snd_soc_jack *jack;
bool plugged;
bool mic_present;
unsigned int buttons_held;
int irq;
};
/* Button values to be reported on the jack */
static const int ts3a227e_buttons[] = {
SND_JACK_BTN_0,
SND_JACK_BTN_1,
SND_JACK_BTN_2,
SND_JACK_BTN_3,
};
#define TS3A227E_NUM_BUTTONS 4
#define TS3A227E_JACK_MASK (SND_JACK_HEADPHONE | \
SND_JACK_MICROPHONE | \
SND_JACK_BTN_0 | \
SND_JACK_BTN_1 | \
SND_JACK_BTN_2 | \
SND_JACK_BTN_3)
/* TS3A227E registers */
#define TS3A227E_REG_DEVICE_ID 0x00
#define TS3A227E_REG_INTERRUPT 0x01
#define TS3A227E_REG_KP_INTERRUPT 0x02
#define TS3A227E_REG_INTERRUPT_DISABLE 0x03
#define TS3A227E_REG_SETTING_1 0x04
#define TS3A227E_REG_SETTING_2 0x05
#define TS3A227E_REG_SETTING_3 0x06
#define TS3A227E_REG_SWITCH_CONTROL_1 0x07
#define TS3A227E_REG_SWITCH_CONTROL_2 0x08
#define TS3A227E_REG_SWITCH_STATUS_1 0x09
#define TS3A227E_REG_SWITCH_STATUS_2 0x0a
#define TS3A227E_REG_ACCESSORY_STATUS 0x0b
#define TS3A227E_REG_ADC_OUTPUT 0x0c
#define TS3A227E_REG_KP_THRESHOLD_1 0x0d
#define TS3A227E_REG_KP_THRESHOLD_2 0x0e
#define TS3A227E_REG_KP_THRESHOLD_3 0x0f
/* TS3A227E_REG_INTERRUPT 0x01 */
#define INS_REM_EVENT 0x01
#define DETECTION_COMPLETE_EVENT 0x02
/* TS3A227E_REG_KP_INTERRUPT 0x02 */
#define PRESS_MASK(idx) (0x01 << (2 * (idx)))
#define RELEASE_MASK(idx) (0x02 << (2 * (idx)))
/* TS3A227E_REG_INTERRUPT_DISABLE 0x03 */
#define INS_REM_INT_DISABLE 0x01
#define DETECTION_COMPLETE_INT_DISABLE 0x02
#define ADC_COMPLETE_INT_DISABLE 0x04
#define INTB_DISABLE 0x08
/* TS3A227E_REG_SETTING_2 0x05 */
#define KP_ENABLE 0x04
/* TS3A227E_REG_SETTING_3 0x06 */
#define MICBIAS_SETTING_SFT (3)
#define MICBIAS_SETTING_MASK (0x7 << MICBIAS_SETTING_SFT)
/* TS3A227E_REG_ACCESSORY_STATUS 0x0b */
#define TYPE_3_POLE 0x01
#define TYPE_4_POLE_OMTP 0x02
#define TYPE_4_POLE_STANDARD 0x04
#define JACK_INSERTED 0x08
#define EITHER_MIC_MASK (TYPE_4_POLE_OMTP | TYPE_4_POLE_STANDARD)
static const struct reg_default ts3a227e_reg_defaults[] = {
{ TS3A227E_REG_DEVICE_ID, 0x10 },
{ TS3A227E_REG_INTERRUPT, 0x00 },
{ TS3A227E_REG_KP_INTERRUPT, 0x00 },
{ TS3A227E_REG_INTERRUPT_DISABLE, 0x08 },
{ TS3A227E_REG_SETTING_1, 0x23 },
{ TS3A227E_REG_SETTING_2, 0x00 },
{ TS3A227E_REG_SETTING_3, 0x0e },
{ TS3A227E_REG_SWITCH_CONTROL_1, 0x00 },
{ TS3A227E_REG_SWITCH_CONTROL_2, 0x00 },
{ TS3A227E_REG_SWITCH_STATUS_1, 0x0c },
{ TS3A227E_REG_SWITCH_STATUS_2, 0x00 },
{ TS3A227E_REG_ACCESSORY_STATUS, 0x00 },
{ TS3A227E_REG_ADC_OUTPUT, 0x00 },
{ TS3A227E_REG_KP_THRESHOLD_1, 0x20 },
{ TS3A227E_REG_KP_THRESHOLD_2, 0x40 },
{ TS3A227E_REG_KP_THRESHOLD_3, 0x68 },
};
static bool ts3a227e_readable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case TS3A227E_REG_DEVICE_ID ... TS3A227E_REG_KP_THRESHOLD_3:
return true;
default:
return false;
}
}
static bool ts3a227e_writeable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case TS3A227E_REG_INTERRUPT_DISABLE ... TS3A227E_REG_SWITCH_CONTROL_2:
case TS3A227E_REG_KP_THRESHOLD_1 ... TS3A227E_REG_KP_THRESHOLD_3:
return true;
default:
return false;
}
}
static bool ts3a227e_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case TS3A227E_REG_INTERRUPT ... TS3A227E_REG_INTERRUPT_DISABLE:
case TS3A227E_REG_SETTING_2:
case TS3A227E_REG_SWITCH_STATUS_1 ... TS3A227E_REG_ADC_OUTPUT:
return true;
default:
return false;
}
}
static void ts3a227e_jack_report(struct ts3a227e *ts3a227e)
{
unsigned int i;
int report = 0;
if (!ts3a227e->jack)
return;
if (ts3a227e->plugged)
report = SND_JACK_HEADPHONE;
if (ts3a227e->mic_present)
report |= SND_JACK_MICROPHONE;
for (i = 0; i < TS3A227E_NUM_BUTTONS; i++) {
if (ts3a227e->buttons_held & (1 << i))
report |= ts3a227e_buttons[i];
}
snd_soc_jack_report(ts3a227e->jack, report, TS3A227E_JACK_MASK);
}
static void ts3a227e_new_jack_state(struct ts3a227e *ts3a227e, unsigned acc_reg)
{
bool plugged, mic_present;
plugged = !!(acc_reg & JACK_INSERTED);
mic_present = plugged && !!(acc_reg & EITHER_MIC_MASK);
ts3a227e->plugged = plugged;
if (mic_present != ts3a227e->mic_present) {
ts3a227e->mic_present = mic_present;
ts3a227e->buttons_held = 0;
if (mic_present) {
/* Enable key press detection. */
regmap_update_bits(ts3a227e->regmap,
TS3A227E_REG_SETTING_2,
KP_ENABLE, KP_ENABLE);
}
}
}
static irqreturn_t ts3a227e_interrupt(int irq, void *data)
{
struct ts3a227e *ts3a227e = (struct ts3a227e *)data;
struct regmap *regmap = ts3a227e->regmap;
unsigned int int_reg, kp_int_reg, acc_reg, i;
struct device *dev = ts3a227e->dev;
int ret;
/* Check for plug/unplug. */
ret = regmap_read(regmap, TS3A227E_REG_INTERRUPT, &int_reg);
if (ret) {
dev_err(dev, "failed to clear interrupt ret=%d\n", ret);
return IRQ_NONE;
}
if (int_reg & (DETECTION_COMPLETE_EVENT | INS_REM_EVENT)) {
regmap_read(regmap, TS3A227E_REG_ACCESSORY_STATUS, &acc_reg);
ts3a227e_new_jack_state(ts3a227e, acc_reg);
}
/* Report any key events. */
ret = regmap_read(regmap, TS3A227E_REG_KP_INTERRUPT, &kp_int_reg);
if (ret) {
dev_err(dev, "failed to clear key interrupt ret=%d\n", ret);
return IRQ_NONE;
}
for (i = 0; i < TS3A227E_NUM_BUTTONS; i++) {
if (kp_int_reg & PRESS_MASK(i))
ts3a227e->buttons_held |= (1 << i);
if (kp_int_reg & RELEASE_MASK(i))
ts3a227e->buttons_held &= ~(1 << i);
}
ts3a227e_jack_report(ts3a227e);
return IRQ_HANDLED;
}
/**
* ts3a227e_enable_jack_detect - Specify a jack for event reporting
*
* @component: component to register the jack with
* @jack: jack to use to report headset and button events on
*
* After this function has been called the headset insert/remove and button
* events 0-3 will be routed to the given jack. Jack can be null to stop
* reporting.
*/
int ts3a227e_enable_jack_detect(struct snd_soc_component *component,
struct snd_soc_jack *jack)
{
struct ts3a227e *ts3a227e = snd_soc_component_get_drvdata(component);
snd_jack_set_key(jack->jack, SND_JACK_BTN_0, KEY_PLAYPAUSE);
snd_jack_set_key(jack->jack, SND_JACK_BTN_1, KEY_VOICECOMMAND);
snd_jack_set_key(jack->jack, SND_JACK_BTN_2, KEY_VOLUMEUP);
snd_jack_set_key(jack->jack, SND_JACK_BTN_3, KEY_VOLUMEDOWN);
ts3a227e->jack = jack;
ts3a227e_jack_report(ts3a227e);
return 0;
}
EXPORT_SYMBOL_GPL(ts3a227e_enable_jack_detect);
static struct snd_soc_component_driver ts3a227e_soc_driver;
static const struct regmap_config ts3a227e_regmap_config = {
.val_bits = 8,
.reg_bits = 8,
.max_register = TS3A227E_REG_KP_THRESHOLD_3,
.readable_reg = ts3a227e_readable_reg,
.writeable_reg = ts3a227e_writeable_reg,
.volatile_reg = ts3a227e_volatile_reg,
.cache_type = REGCACHE_RBTREE,
.reg_defaults = ts3a227e_reg_defaults,
.num_reg_defaults = ARRAY_SIZE(ts3a227e_reg_defaults),
};
static int ts3a227e_parse_device_property(struct ts3a227e *ts3a227e,
struct device *dev)
{
u32 micbias;
int err;
err = device_property_read_u32(dev, "ti,micbias", &micbias);
if (!err) {
regmap_update_bits(ts3a227e->regmap, TS3A227E_REG_SETTING_3,
MICBIAS_SETTING_MASK,
(micbias & 0x07) << MICBIAS_SETTING_SFT);
}
return 0;
}
static int ts3a227e_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct ts3a227e *ts3a227e;
struct device *dev = &i2c->dev;
int ret;
unsigned int acc_reg;
ts3a227e = devm_kzalloc(&i2c->dev, sizeof(*ts3a227e), GFP_KERNEL);
if (ts3a227e == NULL)
return -ENOMEM;
i2c_set_clientdata(i2c, ts3a227e);
ts3a227e->dev = dev;
ts3a227e->irq = i2c->irq;
ts3a227e->regmap = devm_regmap_init_i2c(i2c, &ts3a227e_regmap_config);
if (IS_ERR(ts3a227e->regmap))
return PTR_ERR(ts3a227e->regmap);
ret = ts3a227e_parse_device_property(ts3a227e, dev);
if (ret) {
dev_err(dev, "Failed to parse device property: %d\n", ret);
return ret;
}
ret = devm_request_threaded_irq(dev, i2c->irq, NULL, ts3a227e_interrupt,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
"TS3A227E", ts3a227e);
if (ret) {
dev_err(dev, "Cannot request irq %d (%d)\n", i2c->irq, ret);
return ret;
}
ret = devm_snd_soc_register_component(&i2c->dev, &ts3a227e_soc_driver,
NULL, 0);
if (ret)
return ret;
/* Enable interrupts except for ADC complete. */
regmap_update_bits(ts3a227e->regmap, TS3A227E_REG_INTERRUPT_DISABLE,
INTB_DISABLE | ADC_COMPLETE_INT_DISABLE,
ADC_COMPLETE_INT_DISABLE);
/* Read jack status because chip might not trigger interrupt at boot. */
regmap_read(ts3a227e->regmap, TS3A227E_REG_ACCESSORY_STATUS, &acc_reg);
ts3a227e_new_jack_state(ts3a227e, acc_reg);
ts3a227e_jack_report(ts3a227e);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int ts3a227e_suspend(struct device *dev)
{
struct ts3a227e *ts3a227e = dev_get_drvdata(dev);
dev_dbg(ts3a227e->dev, "suspend disable irq\n");
disable_irq(ts3a227e->irq);
return 0;
}
static int ts3a227e_resume(struct device *dev)
{
struct ts3a227e *ts3a227e = dev_get_drvdata(dev);
dev_dbg(ts3a227e->dev, "resume enable irq\n");
enable_irq(ts3a227e->irq);
return 0;
}
#endif
static const struct dev_pm_ops ts3a227e_pm = {
SET_SYSTEM_SLEEP_PM_OPS(ts3a227e_suspend, ts3a227e_resume)
};
static const struct i2c_device_id ts3a227e_i2c_ids[] = {
{ "ts3a227e", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ts3a227e_i2c_ids);
static const struct of_device_id ts3a227e_of_match[] = {
{ .compatible = "ti,ts3a227e", },
{ }
};
MODULE_DEVICE_TABLE(of, ts3a227e_of_match);
#ifdef CONFIG_ACPI
static struct acpi_device_id ts3a227e_acpi_match[] = {
{ "104C227E", 0 },
{},
};
MODULE_DEVICE_TABLE(acpi, ts3a227e_acpi_match);
#endif
static struct i2c_driver ts3a227e_driver = {
.driver = {
.name = "ts3a227e",
.pm = &ts3a227e_pm,
.of_match_table = of_match_ptr(ts3a227e_of_match),
.acpi_match_table = ACPI_PTR(ts3a227e_acpi_match),
},
.probe = ts3a227e_i2c_probe,
.id_table = ts3a227e_i2c_ids,
};
module_i2c_driver(ts3a227e_driver);
MODULE_DESCRIPTION("ASoC ts3a227e driver");
MODULE_AUTHOR("Dylan Reid <dgreid@chromium.org>");
MODULE_LICENSE("GPL v2");
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