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path: root/drivers/input/keyboard/tm2-touchkey.c
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Diffstat (limited to 'drivers/input/keyboard/tm2-touchkey.c')
-rw-r--r--drivers/input/keyboard/tm2-touchkey.c366
1 files changed, 366 insertions, 0 deletions
diff --git a/drivers/input/keyboard/tm2-touchkey.c b/drivers/input/keyboard/tm2-touchkey.c
new file mode 100644
index 0000000000..0fd761ae05
--- /dev/null
+++ b/drivers/input/keyboard/tm2-touchkey.c
@@ -0,0 +1,366 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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>
+ */
+
+#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 ARIES_TOUCHKEY_CMD_LED_ON 0x1
+#define ARIES_TOUCHKEY_CMD_LED_OFF 0x2
+#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
+
+struct touchkey_variant {
+ u8 keycode_reg;
+ u8 base_reg;
+ u8 cmd_led_on;
+ u8 cmd_led_off;
+ bool no_reg;
+ bool fixed_regulator;
+};
+
+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[3];
+ const struct touchkey_variant *variant;
+ u32 keycodes[4];
+ int num_keycodes;
+};
+
+static const struct touchkey_variant tm2_touchkey_variant = {
+ .keycode_reg = 0x03,
+ .base_reg = 0x00,
+ .cmd_led_on = TM2_TOUCHKEY_CMD_LED_ON,
+ .cmd_led_off = TM2_TOUCHKEY_CMD_LED_OFF,
+};
+
+static const struct touchkey_variant midas_touchkey_variant = {
+ .keycode_reg = 0x00,
+ .base_reg = 0x00,
+ .cmd_led_on = TM2_TOUCHKEY_CMD_LED_ON,
+ .cmd_led_off = TM2_TOUCHKEY_CMD_LED_OFF,
+};
+
+static struct touchkey_variant aries_touchkey_variant = {
+ .no_reg = true,
+ .fixed_regulator = true,
+ .cmd_led_on = ARIES_TOUCHKEY_CMD_LED_ON,
+ .cmd_led_off = ARIES_TOUCHKEY_CMD_LED_OFF,
+};
+
+static const struct touchkey_variant tc360_touchkey_variant = {
+ .keycode_reg = 0x00,
+ .base_reg = 0x00,
+ .fixed_regulator = true,
+ .cmd_led_on = TM2_TOUCHKEY_CMD_LED_ON,
+ .cmd_led_off = TM2_TOUCHKEY_CMD_LED_OFF,
+};
+
+static int 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 = touchkey->variant->cmd_led_off;
+ } else {
+ volt = TM2_TOUCHKEY_LED_VOLTAGE_MAX;
+ data = touchkey->variant->cmd_led_on;
+ }
+
+ if (!touchkey->variant->fixed_regulator)
+ regulator_set_voltage(touchkey->vdd, volt, volt);
+
+ return touchkey->variant->no_reg ?
+ i2c_smbus_write_byte(touchkey->client, data) :
+ i2c_smbus_write_byte_data(touchkey->client,
+ touchkey->variant->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 index;
+ int i;
+
+ if (touchkey->variant->no_reg)
+ data = i2c_smbus_read_byte(touchkey->client);
+ else
+ data = i2c_smbus_read_byte_data(touchkey->client,
+ touchkey->variant->keycode_reg);
+ if (data < 0) {
+ dev_err(&touchkey->client->dev,
+ "failed to read i2c data: %d\n", data);
+ goto out;
+ }
+
+ index = (data & TM2_TOUCHKEY_BIT_KEYCODE) - 1;
+ if (index < 0 || index >= touchkey->num_keycodes) {
+ dev_warn(&touchkey->client->dev,
+ "invalid keycode index %d\n", index);
+ goto out;
+ }
+
+ input_event(touchkey->input_dev, EV_MSC, MSC_SCAN, index);
+
+ if (data & TM2_TOUCHKEY_BIT_PRESS_EV) {
+ for (i = 0; i < touchkey->num_keycodes; i++)
+ input_report_key(touchkey->input_dev,
+ touchkey->keycodes[i], 0);
+ } else {
+ input_report_key(touchkey->input_dev,
+ touchkey->keycodes[index], 1);
+ }
+
+ input_sync(touchkey->input_dev);
+
+out:
+ if (touchkey->variant->fixed_regulator &&
+ data & TM2_TOUCHKEY_BIT_PRESS_EV) {
+ /* touch turns backlight on, so make sure we're in sync */
+ if (touchkey->led_dev.brightness == LED_OFF)
+ tm2_touchkey_led_brightness_set(&touchkey->led_dev,
+ LED_OFF);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int tm2_touchkey_probe(struct i2c_client *client)
+{
+ struct device_node *np = client->dev.of_node;
+ struct tm2_touchkey_data *touchkey;
+ int error;
+ int i;
+
+ 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->variant = of_device_get_match_data(&client->dev);
+
+ touchkey->regulators[0].supply = "vcc";
+ touchkey->regulators[1].supply = "vdd";
+ touchkey->regulators[2].supply = "vddio";
+ 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;
+
+ touchkey->num_keycodes = of_property_read_variable_u32_array(np,
+ "linux,keycodes", touchkey->keycodes, 0,
+ ARRAY_SIZE(touchkey->keycodes));
+ if (touchkey->num_keycodes <= 0) {
+ /* default keycodes */
+ touchkey->keycodes[0] = KEY_PHONE;
+ touchkey->keycodes[1] = KEY_BACK;
+ touchkey->num_keycodes = 2;
+ }
+
+ 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;
+
+ touchkey->input_dev->keycode = touchkey->keycodes;
+ touchkey->input_dev->keycodemax = touchkey->num_keycodes;
+ touchkey->input_dev->keycodesize = sizeof(touchkey->keycodes[0]);
+
+ input_set_capability(touchkey->input_dev, EV_MSC, MSC_SCAN);
+ for (i = 0; i < touchkey->num_keycodes; i++)
+ input_set_capability(touchkey->input_dev, EV_KEY,
+ touchkey->keycodes[i]);
+
+ 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_ON;
+ touchkey->led_dev.max_brightness = LED_ON;
+ touchkey->led_dev.brightness_set_blocking =
+ 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;
+ }
+
+ if (touchkey->variant->fixed_regulator)
+ tm2_touchkey_led_brightness_set(&touchkey->led_dev, LED_ON);
+
+ return 0;
+}
+
+static int 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 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 DEFINE_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",
+ .data = &tm2_touchkey_variant,
+ }, {
+ .compatible = "cypress,midas-touchkey",
+ .data = &midas_touchkey_variant,
+ }, {
+ .compatible = "cypress,aries-touchkey",
+ .data = &aries_touchkey_variant,
+ }, {
+ .compatible = "coreriver,tc360-touchkey",
+ .data = &tc360_touchkey_variant,
+ },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tm2_touchkey_of_match);
+
+static struct i2c_driver tm2_touchkey_driver = {
+ .driver = {
+ .name = TM2_TOUCHKEY_DEV_NAME,
+ .pm = pm_sleep_ptr(&tm2_touchkey_pm_ops),
+ .of_match_table = 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");