[PATCH 2/4] input: tm2-touchkey: Add touchkey driver support for TM2
Jaechul Lee
jcsing.lee at samsung.com
Mon Jan 2 23:57:15 PST 2017
This patch adds support for the TM2 touch key and led
functionlity.
The driver interfaces with userspace through an input device and
reports KEY_PHONE and KEY_BACK event types. LED brightness can be
controlled by "/sys/class/leds/tm2-touchkey/brightness".
Signed-off-by: Jaechul Lee <jcsing.lee at samsung.com>
Signed-off-by: Beomho Seo <beomho.seo at samsung.com>
---
drivers/input/keyboard/Kconfig | 11 ++
drivers/input/keyboard/Makefile | 1 +
drivers/input/keyboard/tm2-touchkey.c | 326 ++++++++++++++++++++++++++++++++++
3 files changed, 338 insertions(+)
create mode 100644 drivers/input/keyboard/tm2-touchkey.c
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index cbd75cf..72c0ba1 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -666,6 +666,17 @@ config KEYBOARD_TC3589X
To compile this driver as a module, choose M here: the
module will be called tc3589x-keypad.
+config KEYBOARD_TM2_TOUCHKEY
+ tristate "tm2-touchkey support"
+ depends on I2C
+ help
+ Say Y here to enable the tm2-touchkey.
+ touchkey driver for tm2. This driver can enable
+ the interrupt and make input events and control led brightness.
+
+ To compile this driver as a module, choose M here.
+ module will be called tm2-touchkey
+
config KEYBOARD_TWL4030
tristate "TI TWL4030/TWL5030/TPS659x0 keypad support"
depends on TWL4030_CORE
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index d9f4cfc..7d9acff 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -61,6 +61,7 @@ obj-$(CONFIG_KEYBOARD_SUN4I_LRADC) += sun4i-lradc-keys.o
obj-$(CONFIG_KEYBOARD_SUNKBD) += sunkbd.o
obj-$(CONFIG_KEYBOARD_TC3589X) += tc3589x-keypad.o
obj-$(CONFIG_KEYBOARD_TEGRA) += tegra-kbc.o
+obj-$(CONFIG_KEYBOARD_TM2_TOUCHKEY) += tm2-touchkey.o
obj-$(CONFIG_KEYBOARD_TWL4030) += twl4030_keypad.o
obj-$(CONFIG_KEYBOARD_XTKBD) += xtkbd.o
obj-$(CONFIG_KEYBOARD_W90P910) += w90p910_keypad.o
diff --git a/drivers/input/keyboard/tm2-touchkey.c b/drivers/input/keyboard/tm2-touchkey.c
new file mode 100644
index 0000000..d9575d8
--- /dev/null
+++ b/drivers/input/keyboard/tm2-touchkey.c
@@ -0,0 +1,326 @@
+/*
+ * Driver for keys on GPIO lines capable of generating interrupts.
+ *
+ * Copyright 2005 Phil Blundell
+ * Copyright 2016 Samsung Electronics Co., Ltd.
+ *
+ * Author: Beomho Seo <beomho.seo at samsung.com>
+ * Author: Jaechul Lee <jcsing.lee at samsung.com>
+ *
+ * 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/bitops.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pm.h>
+#include <linux/regulator/consumer.h>
+#include <linux/workqueue.h>
+
+#define TM2_TOUCHKEY_DEV_NAME "tm2-touchkey"
+#define TM2_TOUCHKEY_KEYCODE_REG 0x03
+#define TM2_TOUCHKEY_BASE_REG 0x00
+#define TM2_TOUCHKEY_CMD_LED_ON 0x10
+#define TM2_TOUCHKEY_CMD_LED_OFF 0x20
+#define TM2_TOUCHKEY_BIT_PRESS_EV BIT(3)
+#define TM2_TOUCHKEY_BIT_KEYCODE GENMASK(2, 0)
+#define TM2_TOUCHKEY_LED_VOLTAGE_MIN 2500000
+#define TM2_TOUCHKEY_LED_VOLTAGE_MAX 3300000
+
+enum {
+ TM2_TOUCHKEY_KEY_MENU = 0x1,
+ TM2_TOUCHKEY_KEY_BACK,
+};
+
+#define tm2_touchkey_power_enable(x) __tm2_touchkey_power_onoff(x, 1)
+#define tm2_touchkey_power_disable(x) __tm2_touchkey_power_onoff(x, 0)
+
+struct tm2_touchkey_data {
+ struct i2c_client *client;
+ struct input_dev *input_dev;
+ struct led_classdev led_dev;
+
+ u8 keycode_type;
+ u8 pressed;
+ struct work_struct irq_work;
+
+ bool power_onoff;
+ struct regulator *regulator_vcc; /* 1.8V */
+ struct regulator *regulator_vdd; /* 3.3V */
+};
+
+static void tm2_touchkey_led_brightness_set(struct led_classdev *led_dev,
+ enum led_brightness brightness)
+{
+ struct tm2_touchkey_data *samsung_touchkey =
+ container_of(led_dev, struct tm2_touchkey_data, led_dev);
+ u32 volt;
+ u8 data;
+
+ if (brightness == LED_OFF) {
+ volt = TM2_TOUCHKEY_LED_VOLTAGE_MIN;
+ data = TM2_TOUCHKEY_CMD_LED_OFF;
+ } else {
+ volt = TM2_TOUCHKEY_LED_VOLTAGE_MAX;
+ data = TM2_TOUCHKEY_CMD_LED_ON;
+ }
+
+ regulator_set_voltage(samsung_touchkey->regulator_vdd, volt, volt);
+ i2c_smbus_write_byte_data(samsung_touchkey->client,
+ TM2_TOUCHKEY_BASE_REG, data);
+}
+
+static int __tm2_touchkey_power_onoff(struct tm2_touchkey_data
+ *samsung_touchkey, bool onoff)
+{
+ int ret = 0;
+
+ if (samsung_touchkey->power_onoff == onoff)
+ return ret;
+
+ if (onoff) {
+ ret = regulator_enable(samsung_touchkey->regulator_vcc);
+ if (ret)
+ return ret;
+
+ ret = regulator_enable(samsung_touchkey->regulator_vdd);
+ if (ret) {
+ regulator_disable(samsung_touchkey->regulator_vcc);
+ return ret;
+ }
+ msleep(150);
+ } else {
+ int err;
+
+ err = regulator_disable(samsung_touchkey->regulator_vcc);
+ if (err)
+ ret = err;
+
+ err = regulator_disable(samsung_touchkey->regulator_vdd);
+ if (err && !ret)
+ ret = err;
+ }
+ samsung_touchkey->power_onoff = onoff;
+
+ return ret;
+}
+
+static void tm2_touchkey_irq_work(struct work_struct *irq_work)
+{
+ struct tm2_touchkey_data *samsung_touchkey =
+ container_of(irq_work, struct tm2_touchkey_data, irq_work);
+
+ if (!samsung_touchkey->pressed) {
+ input_report_key(samsung_touchkey->input_dev, KEY_PHONE, 0);
+ input_report_key(samsung_touchkey->input_dev, KEY_BACK, 0);
+ } else {
+ if (samsung_touchkey->keycode_type == TM2_TOUCHKEY_KEY_MENU)
+ input_report_key(samsung_touchkey->input_dev,
+ KEY_PHONE, 1);
+ else
+ input_report_key(samsung_touchkey->input_dev,
+ KEY_BACK, 1);
+ }
+ input_sync(samsung_touchkey->input_dev);
+}
+
+static irqreturn_t tm2_touchkey_irq_handler(int irq, void *devid)
+{
+ struct tm2_touchkey_data *samsung_touchkey = devid;
+ u32 data;
+
+ data = i2c_smbus_read_byte_data(samsung_touchkey->client,
+ TM2_TOUCHKEY_KEYCODE_REG);
+
+ if (data < 0) {
+ dev_err(&samsung_touchkey->client->dev, "Failed to read i2c data\n");
+ return IRQ_HANDLED;
+ }
+
+ samsung_touchkey->keycode_type = data & TM2_TOUCHKEY_BIT_KEYCODE;
+ samsung_touchkey->pressed = !(data & TM2_TOUCHKEY_BIT_PRESS_EV);
+
+ if (samsung_touchkey->keycode_type != TM2_TOUCHKEY_KEY_MENU &&
+ samsung_touchkey->keycode_type != TM2_TOUCHKEY_KEY_BACK)
+ return IRQ_HANDLED;
+
+ schedule_work(&samsung_touchkey->irq_work);
+
+ return IRQ_HANDLED;
+}
+
+static int tm2_touchkey_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct tm2_touchkey_data *samsung_touchkey;
+ int ret;
+
+ ret = i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_BYTE |
+ I2C_FUNC_SMBUS_BYTE_DATA);
+ if (!ret) {
+ dev_err(&client->dev, "No I2C functionality found\n");
+ return -ENODEV;
+ }
+
+ samsung_touchkey = devm_kzalloc(&client->dev,
+ sizeof(struct tm2_touchkey_data), GFP_KERNEL);
+
+ if (!samsung_touchkey) {
+ dev_err(&client->dev, "Failed to allocate memory.\n");
+ return -ENOMEM;
+ }
+
+ samsung_touchkey->client = client;
+ i2c_set_clientdata(client, samsung_touchkey);
+ INIT_WORK(&samsung_touchkey->irq_work, tm2_touchkey_irq_work);
+
+ /* regulator */
+ samsung_touchkey->regulator_vcc =
+ devm_regulator_get(&client->dev, "vcc");
+ if (IS_ERR(samsung_touchkey->regulator_vcc)) {
+ dev_err(&client->dev, "Failed to get vcc regulator\n");
+ return PTR_ERR(samsung_touchkey->regulator_vcc);
+ }
+
+ samsung_touchkey->regulator_vdd =
+ devm_regulator_get(&client->dev, "vdd");
+ if (IS_ERR(samsung_touchkey->regulator_vdd)) {
+ dev_err(&client->dev, "Failed to get vdd regulator\n");
+ return PTR_ERR(samsung_touchkey->regulator_vcc);
+ }
+
+ /* power */
+ ret = tm2_touchkey_power_enable(samsung_touchkey);
+ if (ret) {
+ dev_err(&client->dev, "Failed to enable power\n");
+ return ret;
+ }
+
+ /* irq */
+ ret = devm_request_threaded_irq(&client->dev,
+ client->irq, NULL,
+ tm2_touchkey_irq_handler,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ TM2_TOUCHKEY_DEV_NAME,
+ samsung_touchkey);
+ if (ret) {
+ dev_err(&client->dev, "Failed to request threaded irq\n");
+ return ret;
+ }
+
+ /* input device */
+ samsung_touchkey->input_dev = devm_input_allocate_device(&client->dev);
+ if (!samsung_touchkey->input_dev) {
+ dev_err(&client->dev, "Failed to alloc input device.\n");
+ return -ENOMEM;
+ }
+ samsung_touchkey->input_dev->name = TM2_TOUCHKEY_DEV_NAME;
+ samsung_touchkey->input_dev->id.bustype = BUS_I2C;
+ samsung_touchkey->input_dev->dev.parent = &client->dev;
+
+ set_bit(EV_KEY, samsung_touchkey->input_dev->evbit);
+ set_bit(KEY_PHONE, samsung_touchkey->input_dev->keybit);
+ set_bit(KEY_BACK, samsung_touchkey->input_dev->keybit);
+ input_set_drvdata(samsung_touchkey->input_dev, samsung_touchkey);
+
+ ret = input_register_device(samsung_touchkey->input_dev);
+ if (ret) {
+ dev_err(&client->dev, "Failed to register input device.\n");
+ return ret;
+ }
+
+ /* led device */
+ samsung_touchkey->led_dev.name = TM2_TOUCHKEY_DEV_NAME;
+ samsung_touchkey->led_dev.brightness = LED_FULL;
+ samsung_touchkey->led_dev.max_brightness = LED_FULL;
+ samsung_touchkey->led_dev.brightness_set =
+ tm2_touchkey_led_brightness_set;
+
+ ret = devm_led_classdev_register(&client->dev,
+ &samsung_touchkey->led_dev);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to register touchkey led\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static void tm2_touchkey_shutdown(struct i2c_client *client)
+{
+ struct tm2_touchkey_data *samsung_touchkey =
+ i2c_get_clientdata(client);
+ int ret;
+
+ disable_irq(client->irq);
+ ret = tm2_touchkey_power_disable(samsung_touchkey);
+ if (ret)
+ dev_err(&client->dev, "Failed to disable power\n");
+}
+
+static int tm2_touchkey_suspend(struct device *dev)
+{
+ struct tm2_touchkey_data *samsung_touchkey = dev_get_drvdata(dev);
+ int ret;
+
+ disable_irq(samsung_touchkey->client->irq);
+ ret = tm2_touchkey_power_disable(samsung_touchkey);
+ if (ret)
+ dev_err(dev, "Failed to disable power\n");
+
+ return ret;
+}
+
+static int tm2_touchkey_resume(struct device *dev)
+{
+ struct tm2_touchkey_data *samsung_touchkey = dev_get_drvdata(dev);
+ int ret;
+
+ enable_irq(samsung_touchkey->client->irq);
+ ret = tm2_touchkey_power_enable(samsung_touchkey);
+ if (ret)
+ dev_err(dev, "Failed to enable power\n");
+
+ return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(tm2_touchkey_pm_ops, tm2_touchkey_suspend,
+ tm2_touchkey_resume);
+
+static const struct i2c_device_id tm2_touchkey_id_table[] = {
+ {TM2_TOUCHKEY_DEV_NAME, 0},
+ {},
+};
+
+static const struct of_device_id tm2_touchkey_of_match[] = {
+ {.compatible = "samsung,tm2-touchkey",},
+ {},
+};
+
+static struct i2c_driver tm2_touchkey_driver = {
+ .driver = {
+ .name = TM2_TOUCHKEY_DEV_NAME,
+ .pm = &tm2_touchkey_pm_ops,
+ .of_match_table = of_match_ptr(tm2_touchkey_of_match),
+ },
+ .probe = tm2_touchkey_probe,
+ .shutdown = tm2_touchkey_shutdown,
+ .id_table = tm2_touchkey_id_table,
+};
+
+module_i2c_driver(tm2_touchkey_driver);
+
+MODULE_AUTHOR("Beomho Seo <beomho.seo at samsung.com>");
+MODULE_AUTHOR("Jaechul Lee <jcsing.lee at samsung.com>");
+MODULE_DESCRIPTION("Samsung touchkey driver");
+MODULE_LICENSE("GPL v2");
--
2.7.4
More information about the linux-arm-kernel
mailing list