From 72d1f2346ded5b1743d7938f4522550b4da9c82d Mon Sep 17 00:00:00 2001 From: Jaechul Lee Date: Wed, 18 Jan 2017 14:35:42 -0800 Subject: [PATCH] Input: tm2-touchkey - add touchkey driver support for TM2 This patch adds support for the TM2 touch key and led functionality. 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: Beomho Seo Signed-off-by: Jaechul Lee Reviewed-by: Javier Martinez Canillas Reviewed-by: Andi Shyti Reviewed-by: Chanwoo Choi Tested-by: Chanwoo Choi Acked-by: Krzysztof Kozlowski Acked-by: Rob Herring Signed-off-by: Dmitry Torokhov --- .../bindings/input/cypress,tm2-touchkey.txt | 27 ++ drivers/input/keyboard/Kconfig | 11 + drivers/input/keyboard/Makefile | 1 + drivers/input/keyboard/tm2-touchkey.c | 286 +++++++++++++++++++++ 4 files changed, 325 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/cypress,tm2-touchkey.txt create mode 100644 drivers/input/keyboard/tm2-touchkey.c diff --git a/Documentation/devicetree/bindings/input/cypress,tm2-touchkey.txt b/Documentation/devicetree/bindings/input/cypress,tm2-touchkey.txt new file mode 100644 index 0000000..635f62c --- /dev/null +++ b/Documentation/devicetree/bindings/input/cypress,tm2-touchkey.txt @@ -0,0 +1,27 @@ +Samsung tm2-touchkey + +Required properties: +- compatible: must be "cypress,tm2-touchkey" +- reg: I2C address of the chip. +- interrupt-parent: a phandle for the interrupt controller (see interrupt + binding[0]). +- interrupts: interrupt to which the chip is connected (see interrupt + binding[0]). +- vcc-supply : internal regulator output. 1.8V +- vdd-supply : power supply for IC 3.3V + +[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt + +Example: + &i2c0 { + /* ... */ + + touchkey@20 { + compatible = "cypress,tm2-touchkey"; + reg = <0x20>; + interrupt-parent = <&gpa3>; + interrupts = <2 IRQ_TYPE_EDGE_FALLING>; + vcc-supply=<&ldo32_reg>; + vdd-supply=<&ldo33_reg>; + }; + }; diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig index cbd75cf..97acd65 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 + depends on LEDS_CLASS + help + Say Y here to enable device driver for tm2-touchkey with + LED control for the Exynos5433 TM2 board. + + 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..916e2f3 --- /dev/null +++ b/drivers/input/keyboard/tm2-touchkey.c @@ -0,0 +1,286 @@ +/* + * TM2 touchkey device driver + * + * Copyright 2005 Phil Blundell + * Copyright 2016 Samsung Electronics Co., Ltd. + * + * Author: Beomho Seo + * Author: Jaechul Lee + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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, +}; + +struct tm2_touchkey_data { + struct i2c_client *client; + struct input_dev *input_dev; + struct led_classdev led_dev; + struct regulator *vdd; + struct regulator_bulk_data regulators[2]; +}; + +static void tm2_touchkey_led_brightness_set(struct led_classdev *led_dev, + enum led_brightness brightness) +{ + struct tm2_touchkey_data *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(touchkey->vdd, volt, volt); + i2c_smbus_write_byte_data(touchkey->client, + TM2_TOUCHKEY_BASE_REG, data); +} + +static int tm2_touchkey_power_enable(struct tm2_touchkey_data *touchkey) +{ + int error; + + error = regulator_bulk_enable(ARRAY_SIZE(touchkey->regulators), + touchkey->regulators); + if (error) + return error; + + /* waiting for device initialization, at least 150ms */ + msleep(150); + + return 0; +} + +static void tm2_touchkey_power_disable(void *data) +{ + struct tm2_touchkey_data *touchkey = data; + + regulator_bulk_disable(ARRAY_SIZE(touchkey->regulators), + touchkey->regulators); +} + +static irqreturn_t tm2_touchkey_irq_handler(int irq, void *devid) +{ + struct tm2_touchkey_data *touchkey = devid; + int data; + int key; + + data = i2c_smbus_read_byte_data(touchkey->client, + TM2_TOUCHKEY_KEYCODE_REG); + if (data < 0) { + dev_err(&touchkey->client->dev, + "failed to read i2c data: %d\n", data); + goto out; + } + + switch (data & TM2_TOUCHKEY_BIT_KEYCODE) { + case TM2_TOUCHKEY_KEY_MENU: + key = KEY_PHONE; + break; + + case TM2_TOUCHKEY_KEY_BACK: + key = KEY_BACK; + break; + + default: + dev_warn(&touchkey->client->dev, + "unhandled keycode, data %#02x\n", data); + goto out; + } + + if (data & TM2_TOUCHKEY_BIT_PRESS_EV) { + input_report_key(touchkey->input_dev, KEY_PHONE, 0); + input_report_key(touchkey->input_dev, KEY_BACK, 0); + } else { + input_report_key(touchkey->input_dev, key, 1); + } + + input_sync(touchkey->input_dev); + +out: + return IRQ_HANDLED; +} + +static int tm2_touchkey_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct tm2_touchkey_data *touchkey; + int error; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA)) { + dev_err(&client->dev, "incompatible I2C adapter\n"); + return -EIO; + } + + touchkey = devm_kzalloc(&client->dev, sizeof(*touchkey), GFP_KERNEL); + if (!touchkey) + return -ENOMEM; + + touchkey->client = client; + i2c_set_clientdata(client, touchkey); + + touchkey->regulators[0].supply = "vcc"; + touchkey->regulators[1].supply = "vdd"; + error = devm_regulator_bulk_get(&client->dev, + ARRAY_SIZE(touchkey->regulators), + touchkey->regulators); + if (error) { + dev_err(&client->dev, "failed to get regulators: %d\n", error); + return error; + } + + /* Save VDD for easy access */ + touchkey->vdd = touchkey->regulators[1].consumer; + + error = tm2_touchkey_power_enable(touchkey); + if (error) { + dev_err(&client->dev, "failed to power up device: %d\n", error); + return error; + } + + error = devm_add_action_or_reset(&client->dev, + tm2_touchkey_power_disable, touchkey); + if (error) { + dev_err(&client->dev, + "failed to install poweroff handler: %d\n", error); + return error; + } + + /* input device */ + touchkey->input_dev = devm_input_allocate_device(&client->dev); + if (!touchkey->input_dev) { + dev_err(&client->dev, "failed to allocate input device\n"); + return -ENOMEM; + } + + touchkey->input_dev->name = TM2_TOUCHKEY_DEV_NAME; + touchkey->input_dev->id.bustype = BUS_I2C; + + input_set_capability(touchkey->input_dev, EV_KEY, KEY_PHONE); + input_set_capability(touchkey->input_dev, EV_KEY, KEY_BACK); + + input_set_drvdata(touchkey->input_dev, touchkey); + + error = input_register_device(touchkey->input_dev); + if (error) { + dev_err(&client->dev, + "failed to register input device: %d\n", error); + return error; + } + + error = devm_request_threaded_irq(&client->dev, client->irq, + NULL, tm2_touchkey_irq_handler, + IRQF_ONESHOT, + TM2_TOUCHKEY_DEV_NAME, touchkey); + if (error) { + dev_err(&client->dev, + "failed to request threaded irq: %d\n", error); + return error; + } + + /* led device */ + touchkey->led_dev.name = TM2_TOUCHKEY_DEV_NAME; + touchkey->led_dev.brightness = LED_FULL; + touchkey->led_dev.max_brightness = LED_FULL; + touchkey->led_dev.brightness_set = tm2_touchkey_led_brightness_set; + + error = devm_led_classdev_register(&client->dev, &touchkey->led_dev); + if (error) { + dev_err(&client->dev, + "failed to register touchkey led: %d\n", error); + return error; + } + + return 0; +} + +static int __maybe_unused tm2_touchkey_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct tm2_touchkey_data *touchkey = i2c_get_clientdata(client); + + disable_irq(client->irq); + tm2_touchkey_power_disable(touchkey); + + return 0; +} + +static int __maybe_unused tm2_touchkey_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct tm2_touchkey_data *touchkey = i2c_get_clientdata(client); + int ret; + + enable_irq(client->irq); + + ret = tm2_touchkey_power_enable(touchkey); + if (ret) + dev_err(dev, "failed to enable power: %d\n", ret); + + 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 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, tm2_touchkey_id_table); + +static const struct of_device_id tm2_touchkey_of_match[] = { + { .compatible = "cypress,tm2-touchkey", }, + { }, +}; +MODULE_DEVICE_TABLE(of, tm2_touchkey_of_match); + +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, + .id_table = tm2_touchkey_id_table, +}; +module_i2c_driver(tm2_touchkey_driver); + +MODULE_AUTHOR("Beomho Seo "); +MODULE_AUTHOR("Jaechul Lee "); +MODULE_DESCRIPTION("Samsung touchkey driver"); +MODULE_LICENSE("GPL v2"); -- 2.7.4