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361 lines
9.2 KiB
361 lines
9.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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 <[email protected]> |
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* Author: Jaechul Lee <[email protected]> |
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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/of_device.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 ARIES_TOUCHKEY_CMD_LED_ON 0x1 |
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#define ARIES_TOUCHKEY_CMD_LED_OFF 0x2 |
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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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struct touchkey_variant { |
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u8 keycode_reg; |
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u8 base_reg; |
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u8 cmd_led_on; |
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u8 cmd_led_off; |
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bool no_reg; |
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bool fixed_regulator; |
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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[3]; |
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const struct touchkey_variant *variant; |
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u32 keycodes[4]; |
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int num_keycodes; |
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}; |
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static const struct touchkey_variant tm2_touchkey_variant = { |
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.keycode_reg = 0x03, |
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.base_reg = 0x00, |
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.cmd_led_on = TM2_TOUCHKEY_CMD_LED_ON, |
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.cmd_led_off = TM2_TOUCHKEY_CMD_LED_OFF, |
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}; |
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static const struct touchkey_variant midas_touchkey_variant = { |
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.keycode_reg = 0x00, |
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.base_reg = 0x00, |
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.cmd_led_on = TM2_TOUCHKEY_CMD_LED_ON, |
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.cmd_led_off = TM2_TOUCHKEY_CMD_LED_OFF, |
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}; |
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static struct touchkey_variant aries_touchkey_variant = { |
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.no_reg = true, |
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.fixed_regulator = true, |
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.cmd_led_on = ARIES_TOUCHKEY_CMD_LED_ON, |
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.cmd_led_off = ARIES_TOUCHKEY_CMD_LED_OFF, |
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}; |
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static const struct touchkey_variant tc360_touchkey_variant = { |
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.keycode_reg = 0x00, |
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.base_reg = 0x00, |
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.fixed_regulator = true, |
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.cmd_led_on = TM2_TOUCHKEY_CMD_LED_ON, |
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.cmd_led_off = TM2_TOUCHKEY_CMD_LED_OFF, |
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}; |
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static int 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 = touchkey->variant->cmd_led_off; |
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} else { |
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volt = TM2_TOUCHKEY_LED_VOLTAGE_MAX; |
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data = touchkey->variant->cmd_led_on; |
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} |
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if (!touchkey->variant->fixed_regulator) |
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regulator_set_voltage(touchkey->vdd, volt, volt); |
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return touchkey->variant->no_reg ? |
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i2c_smbus_write_byte(touchkey->client, data) : |
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i2c_smbus_write_byte_data(touchkey->client, |
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touchkey->variant->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 index; |
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int i; |
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if (touchkey->variant->no_reg) |
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data = i2c_smbus_read_byte(touchkey->client); |
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else |
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data = i2c_smbus_read_byte_data(touchkey->client, |
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touchkey->variant->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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index = (data & TM2_TOUCHKEY_BIT_KEYCODE) - 1; |
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if (index < 0 || index >= touchkey->num_keycodes) { |
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dev_warn(&touchkey->client->dev, |
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"invalid keycode index %d\n", index); |
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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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for (i = 0; i < touchkey->num_keycodes; i++) |
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input_report_key(touchkey->input_dev, |
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touchkey->keycodes[i], 0); |
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} else { |
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input_report_key(touchkey->input_dev, |
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touchkey->keycodes[index], 1); |
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} |
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input_sync(touchkey->input_dev); |
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out: |
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if (touchkey->variant->fixed_regulator && |
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data & TM2_TOUCHKEY_BIT_PRESS_EV) { |
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/* touch turns backlight on, so make sure we're in sync */ |
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if (touchkey->led_dev.brightness == LED_OFF) |
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tm2_touchkey_led_brightness_set(&touchkey->led_dev, |
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LED_OFF); |
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} |
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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 device_node *np = client->dev.of_node; |
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struct tm2_touchkey_data *touchkey; |
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int error; |
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int i; |
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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->variant = of_device_get_match_data(&client->dev); |
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touchkey->regulators[0].supply = "vcc"; |
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touchkey->regulators[1].supply = "vdd"; |
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touchkey->regulators[2].supply = "vddio"; |
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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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touchkey->num_keycodes = of_property_read_variable_u32_array(np, |
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"linux,keycodes", touchkey->keycodes, 0, |
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ARRAY_SIZE(touchkey->keycodes)); |
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if (touchkey->num_keycodes <= 0) { |
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/* default keycodes */ |
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touchkey->keycodes[0] = KEY_PHONE; |
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touchkey->keycodes[1] = KEY_BACK; |
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touchkey->num_keycodes = 2; |
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} |
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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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for (i = 0; i < touchkey->num_keycodes; i++) |
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input_set_capability(touchkey->input_dev, EV_KEY, |
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touchkey->keycodes[i]); |
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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_ON; |
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touchkey->led_dev.max_brightness = LED_ON; |
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touchkey->led_dev.brightness_set_blocking = |
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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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if (touchkey->variant->fixed_regulator) |
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tm2_touchkey_led_brightness_set(&touchkey->led_dev, LED_ON); |
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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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{ |
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.compatible = "cypress,tm2-touchkey", |
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.data = &tm2_touchkey_variant, |
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}, { |
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.compatible = "cypress,midas-touchkey", |
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.data = &midas_touchkey_variant, |
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}, { |
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.compatible = "cypress,aries-touchkey", |
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.data = &aries_touchkey_variant, |
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}, { |
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.compatible = "coreriver,tc360-touchkey", |
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.data = &tc360_touchkey_variant, |
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}, |
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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 <[email protected]>"); |
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MODULE_AUTHOR("Jaechul Lee <[email protected]>"); |
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MODULE_DESCRIPTION("Samsung touchkey driver"); |
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MODULE_LICENSE("GPL v2");
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