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