| /* |
| * 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 <sound/core.h> |
| #include <sound/jack.h> |
| #include <sound/soc.h> |
| |
| #include "ts3a227e.h" |
| |
| struct ts3a227e { |
| struct regmap *regmap; |
| struct snd_soc_jack *jack; |
| bool plugged; |
| bool mic_present; |
| unsigned int buttons_held; |
| }; |
| |
| /* 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; |
| |
| /* Check for plug/unplug. */ |
| regmap_read(regmap, TS3A227E_REG_INTERRUPT, &int_reg); |
| 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. */ |
| regmap_read(regmap, TS3A227E_REG_KP_INTERRUPT, &kp_int_reg); |
| 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_MEDIA); |
| 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->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; |
| } |
| |
| 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); |
| |
| static struct i2c_driver ts3a227e_driver = { |
| .driver = { |
| .name = "ts3a227e", |
| .owner = THIS_MODULE, |
| .of_match_table = of_match_ptr(ts3a227e_of_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"); |