--- /dev/null
+/*
+ * 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>
+
+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_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_VOLUMEUP);
+ snd_jack_set_key(jack->jack, SND_JACK_BTN_2, KEY_VOLUMEDOWN);
+ snd_jack_set_key(jack->jack, SND_JACK_BTN_3, KEY_VOICECOMMAND);
+
+ 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_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct ts3a227e *ts3a227e;
+ struct device *dev = &i2c->dev;
+ int ret;
+
+ 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 = 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);
+
+ 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");
projects / cascardo / linux.git / commitdiff