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 <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> Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> Tested-by: Chanwoo Choi <cw00.choi@samsung.com> Acked-by: Krzysztof Kozlowski <krzk@kernel.org> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Jaechul Lee
Dmitry Torokhov
Родитель
aa6f922221
Коммит
72d1f2346d
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@ -0,0 +1,27 @@
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Samsung tm2-touchkey
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Required properties:
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- compatible: must be "cypress,tm2-touchkey"
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- reg: I2C address of the chip.
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- interrupt-parent: a phandle for the interrupt controller (see interrupt
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binding[0]).
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- interrupts: interrupt to which the chip is connected (see interrupt
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binding[0]).
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- vcc-supply : internal regulator output. 1.8V
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- vdd-supply : power supply for IC 3.3V
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[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
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Example:
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&i2c0 {
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/* ... */
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touchkey@20 {
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compatible = "cypress,tm2-touchkey";
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reg = <0x20>;
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interrupt-parent = <&gpa3>;
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interrupts = <2 IRQ_TYPE_EDGE_FALLING>;
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vcc-supply=<&ldo32_reg>;
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vdd-supply=<&ldo33_reg>;
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};
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};
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@ -666,6 +666,17 @@ config KEYBOARD_TC3589X
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To compile this driver as a module, choose M here: the
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module will be called tc3589x-keypad.
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config KEYBOARD_TM2_TOUCHKEY
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tristate "TM2 touchkey support"
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depends on I2C
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depends on LEDS_CLASS
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help
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Say Y here to enable device driver for tm2-touchkey with
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LED control for the Exynos5433 TM2 board.
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To compile this driver as a module, choose M here.
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module will be called tm2-touchkey.
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config KEYBOARD_TWL4030
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tristate "TI TWL4030/TWL5030/TPS659x0 keypad support"
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depends on TWL4030_CORE
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@ -61,6 +61,7 @@ obj-$(CONFIG_KEYBOARD_SUN4I_LRADC) += sun4i-lradc-keys.o
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obj-$(CONFIG_KEYBOARD_SUNKBD) += sunkbd.o
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obj-$(CONFIG_KEYBOARD_TC3589X) += tc3589x-keypad.o
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obj-$(CONFIG_KEYBOARD_TEGRA) += tegra-kbc.o
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obj-$(CONFIG_KEYBOARD_TM2_TOUCHKEY) += tm2-touchkey.o
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obj-$(CONFIG_KEYBOARD_TWL4030) += twl4030_keypad.o
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obj-$(CONFIG_KEYBOARD_XTKBD) += xtkbd.o
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obj-$(CONFIG_KEYBOARD_W90P910) += w90p910_keypad.o
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@ -0,0 +1,286 @@
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/*
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* TM2 touchkey device driver
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*
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* Copyright 2005 Phil Blundell
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* Copyright 2016 Samsung Electronics Co., Ltd.
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*
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* Author: Beomho Seo <beomho.seo@samsung.com>
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* Author: Jaechul Lee <jcsing.lee@samsung.com>
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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/bitops.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/pm.h>
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#include <linux/regulator/consumer.h>
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#define TM2_TOUCHKEY_DEV_NAME "tm2-touchkey"
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#define TM2_TOUCHKEY_KEYCODE_REG 0x03
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#define TM2_TOUCHKEY_BASE_REG 0x00
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#define TM2_TOUCHKEY_CMD_LED_ON 0x10
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#define TM2_TOUCHKEY_CMD_LED_OFF 0x20
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#define TM2_TOUCHKEY_BIT_PRESS_EV BIT(3)
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#define TM2_TOUCHKEY_BIT_KEYCODE GENMASK(2, 0)
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#define TM2_TOUCHKEY_LED_VOLTAGE_MIN 2500000
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#define TM2_TOUCHKEY_LED_VOLTAGE_MAX 3300000
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enum {
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TM2_TOUCHKEY_KEY_MENU = 0x1,
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TM2_TOUCHKEY_KEY_BACK,
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};
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struct tm2_touchkey_data {
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struct i2c_client *client;
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struct input_dev *input_dev;
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struct led_classdev led_dev;
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struct regulator *vdd;
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struct regulator_bulk_data regulators[2];
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};
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static void tm2_touchkey_led_brightness_set(struct led_classdev *led_dev,
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enum led_brightness brightness)
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{
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struct tm2_touchkey_data *touchkey =
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container_of(led_dev, struct tm2_touchkey_data, led_dev);
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u32 volt;
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u8 data;
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if (brightness == LED_OFF) {
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volt = TM2_TOUCHKEY_LED_VOLTAGE_MIN;
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data = TM2_TOUCHKEY_CMD_LED_OFF;
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} else {
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volt = TM2_TOUCHKEY_LED_VOLTAGE_MAX;
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data = TM2_TOUCHKEY_CMD_LED_ON;
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}
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regulator_set_voltage(touchkey->vdd, volt, volt);
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i2c_smbus_write_byte_data(touchkey->client,
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TM2_TOUCHKEY_BASE_REG, data);
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}
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static int tm2_touchkey_power_enable(struct tm2_touchkey_data *touchkey)
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{
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int error;
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error = regulator_bulk_enable(ARRAY_SIZE(touchkey->regulators),
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touchkey->regulators);
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if (error)
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return error;
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/* waiting for device initialization, at least 150ms */
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msleep(150);
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return 0;
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}
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static void tm2_touchkey_power_disable(void *data)
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{
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struct tm2_touchkey_data *touchkey = data;
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regulator_bulk_disable(ARRAY_SIZE(touchkey->regulators),
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touchkey->regulators);
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}
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static irqreturn_t tm2_touchkey_irq_handler(int irq, void *devid)
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{
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struct tm2_touchkey_data *touchkey = devid;
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int data;
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int key;
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data = i2c_smbus_read_byte_data(touchkey->client,
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TM2_TOUCHKEY_KEYCODE_REG);
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if (data < 0) {
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dev_err(&touchkey->client->dev,
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"failed to read i2c data: %d\n", data);
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goto out;
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}
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switch (data & TM2_TOUCHKEY_BIT_KEYCODE) {
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case TM2_TOUCHKEY_KEY_MENU:
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key = KEY_PHONE;
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break;
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case TM2_TOUCHKEY_KEY_BACK:
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key = KEY_BACK;
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break;
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default:
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dev_warn(&touchkey->client->dev,
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"unhandled keycode, data %#02x\n", data);
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goto out;
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}
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if (data & TM2_TOUCHKEY_BIT_PRESS_EV) {
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input_report_key(touchkey->input_dev, KEY_PHONE, 0);
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input_report_key(touchkey->input_dev, KEY_BACK, 0);
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} else {
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input_report_key(touchkey->input_dev, key, 1);
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}
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input_sync(touchkey->input_dev);
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out:
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return IRQ_HANDLED;
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}
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static int tm2_touchkey_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct tm2_touchkey_data *touchkey;
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int error;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA)) {
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dev_err(&client->dev, "incompatible I2C adapter\n");
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return -EIO;
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}
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touchkey = devm_kzalloc(&client->dev, sizeof(*touchkey), GFP_KERNEL);
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if (!touchkey)
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return -ENOMEM;
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touchkey->client = client;
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i2c_set_clientdata(client, touchkey);
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touchkey->regulators[0].supply = "vcc";
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touchkey->regulators[1].supply = "vdd";
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error = devm_regulator_bulk_get(&client->dev,
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ARRAY_SIZE(touchkey->regulators),
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touchkey->regulators);
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if (error) {
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dev_err(&client->dev, "failed to get regulators: %d\n", error);
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return error;
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}
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/* Save VDD for easy access */
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touchkey->vdd = touchkey->regulators[1].consumer;
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error = tm2_touchkey_power_enable(touchkey);
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if (error) {
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dev_err(&client->dev, "failed to power up device: %d\n", error);
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return error;
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}
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error = devm_add_action_or_reset(&client->dev,
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tm2_touchkey_power_disable, touchkey);
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if (error) {
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dev_err(&client->dev,
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"failed to install poweroff handler: %d\n", error);
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return error;
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}
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/* input device */
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touchkey->input_dev = devm_input_allocate_device(&client->dev);
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if (!touchkey->input_dev) {
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dev_err(&client->dev, "failed to allocate input device\n");
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return -ENOMEM;
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}
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touchkey->input_dev->name = TM2_TOUCHKEY_DEV_NAME;
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touchkey->input_dev->id.bustype = BUS_I2C;
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input_set_capability(touchkey->input_dev, EV_KEY, KEY_PHONE);
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input_set_capability(touchkey->input_dev, EV_KEY, KEY_BACK);
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input_set_drvdata(touchkey->input_dev, touchkey);
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error = input_register_device(touchkey->input_dev);
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if (error) {
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dev_err(&client->dev,
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"failed to register input device: %d\n", error);
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return error;
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}
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error = devm_request_threaded_irq(&client->dev, client->irq,
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NULL, tm2_touchkey_irq_handler,
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IRQF_ONESHOT,
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TM2_TOUCHKEY_DEV_NAME, touchkey);
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if (error) {
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dev_err(&client->dev,
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"failed to request threaded irq: %d\n", error);
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return error;
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}
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/* led device */
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touchkey->led_dev.name = TM2_TOUCHKEY_DEV_NAME;
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touchkey->led_dev.brightness = LED_FULL;
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touchkey->led_dev.max_brightness = LED_FULL;
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touchkey->led_dev.brightness_set = tm2_touchkey_led_brightness_set;
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error = devm_led_classdev_register(&client->dev, &touchkey->led_dev);
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if (error) {
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dev_err(&client->dev,
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"failed to register touchkey led: %d\n", error);
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return error;
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}
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return 0;
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}
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static int __maybe_unused tm2_touchkey_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct tm2_touchkey_data *touchkey = i2c_get_clientdata(client);
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disable_irq(client->irq);
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tm2_touchkey_power_disable(touchkey);
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return 0;
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}
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static int __maybe_unused tm2_touchkey_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct tm2_touchkey_data *touchkey = i2c_get_clientdata(client);
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int ret;
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enable_irq(client->irq);
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ret = tm2_touchkey_power_enable(touchkey);
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if (ret)
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dev_err(dev, "failed to enable power: %d\n", ret);
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return ret;
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}
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static SIMPLE_DEV_PM_OPS(tm2_touchkey_pm_ops,
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tm2_touchkey_suspend, tm2_touchkey_resume);
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static const struct i2c_device_id tm2_touchkey_id_table[] = {
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{ TM2_TOUCHKEY_DEV_NAME, 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, tm2_touchkey_id_table);
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static const struct of_device_id tm2_touchkey_of_match[] = {
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{ .compatible = "cypress,tm2-touchkey", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, tm2_touchkey_of_match);
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static struct i2c_driver tm2_touchkey_driver = {
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.driver = {
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.name = TM2_TOUCHKEY_DEV_NAME,
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.pm = &tm2_touchkey_pm_ops,
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.of_match_table = of_match_ptr(tm2_touchkey_of_match),
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},
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.probe = tm2_touchkey_probe,
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.id_table = tm2_touchkey_id_table,
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};
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module_i2c_driver(tm2_touchkey_driver);
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MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
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MODULE_AUTHOR("Jaechul Lee <jcsing.lee@samsung.com>");
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MODULE_DESCRIPTION("Samsung touchkey driver");
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MODULE_LICENSE("GPL v2");
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