| Message ID | 20170115071110.GA24007@dtor-ws (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
Dear Dmitry Torokhov, On Sat, Jan 14, 2017 at 11:11:10PM -0800, Dmitry Torokhov wrote: > Hi Jaechul, > > On Mon, Jan 09, 2017 at 04:22:14PM +0900, Jaechul Lee wrote: > > +static irqreturn_t tm2_touchkey_irq_handler(int irq, void *devid) > > +{ > > + struct tm2_touchkey_data *touchkey = devid; > > + u32 data; > > + > > + data = i2c_smbus_read_byte_data(touchkey->client, > > + TM2_TOUCHKEY_KEYCODE_REG); > > + > > + if (data < 0) { > > You declared data as u32 so it will never be negative. Yes, it won't be negative. > > > + dev_err(&touchkey->client->dev, "Failed to read i2c data\n"); > > + return IRQ_HANDLED; > > + } > > + > > + touchkey->keycode_type = data & TM2_TOUCHKEY_BIT_KEYCODE; > > + touchkey->pressed = !(data & TM2_TOUCHKEY_BIT_PRESS_EV); > > There is no need to store this in touchkey structure as you are not > going to use it past this function. I agree with you. it doesn't need to store variables in touchkey structure. > > Does the version of the patch below work for you? I found that the condition is inverted. if data & TM2_TOUCHKEY_BIT_PRESS_EV is true, it means touchkey is released. it should be changed like this. 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); } I will prepare for patch v7 based on your modifications. Thank you very much for your reviews. Best Regards, Jaechul > > Thanks. > > -- > Dmitry > > > Input: tm2-touchkey - add touchkey driver support for TM2 > > From: Jaechul Lee <jcsing.lee@samsung.com> > > 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 <beomho.seo@samsung.com> > Signed-off-by: Jaechul Lee <jcsing.lee@samsung.com> > Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com> > Reviewed-by: Andi Shyti <andi.shyti@samsung.com> > Acked-by: Krzysztof Kozlowski <krzk@kernel.org> > Patchwork-Id: 9504149 > Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> > --- > drivers/input/keyboard/Kconfig | 11 + > drivers/input/keyboard/Makefile | 1 > drivers/input/keyboard/tm2-touchkey.c | 286 +++++++++++++++++++++++++++++++++ > 3 files changed, 298 insertions(+) > create mode 100644 drivers/input/keyboard/tm2-touchkey.c > > diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig > index cbd75cf44739..97acd6524ad7 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 d9f4cfcf3410..7d9acff819a7 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 000000000000..79bc2d2bd4b9 > --- /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 <beomho.seo@samsung.com> > + * Author: Jaechul Lee <jcsing.lee@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> > + > +#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, 1); > + } else { > + input_report_key(touchkey->input_dev, KEY_PHONE, 0); > + input_report_key(touchkey->input_dev, KEY_BACK, 0); > + } > + > + 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 <beomho.seo@samsung.com>"); > +MODULE_AUTHOR("Jaechul Lee <jcsing.lee@samsung.com>"); > +MODULE_DESCRIPTION("Samsung touchkey driver"); > +MODULE_LICENSE("GPL v2"); > -- > To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig index cbd75cf44739..97acd6524ad7 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 d9f4cfcf3410..7d9acff819a7 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 000000000000..79bc2d2bd4b9 --- /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 <beomho.seo@samsung.com> + * Author: Jaechul Lee <jcsing.lee@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> + +#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, 1); + } else { + input_report_key(touchkey->input_dev, KEY_PHONE, 0); + input_report_key(touchkey->input_dev, KEY_BACK, 0); + } + + 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 <beomho.seo@samsung.com>"); +MODULE_AUTHOR("Jaechul Lee <jcsing.lee@samsung.com>"); +MODULE_DESCRIPTION("Samsung touchkey driver"); +MODULE_LICENSE("GPL v2");