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474 lines
10 KiB
474 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* qt2160.c - Atmel AT42QT2160 Touch Sense Controller |
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* |
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* Copyright (C) 2009 Raphael Derosso Pereira <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/leds.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/jiffies.h> |
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#include <linux/i2c.h> |
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#include <linux/irq.h> |
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#include <linux/interrupt.h> |
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#include <linux/input.h> |
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#define QT2160_VALID_CHIPID 0x11 |
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#define QT2160_CMD_CHIPID 0 |
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#define QT2160_CMD_CODEVER 1 |
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#define QT2160_CMD_GSTAT 2 |
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#define QT2160_CMD_KEYS3 3 |
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#define QT2160_CMD_KEYS4 4 |
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#define QT2160_CMD_SLIDE 5 |
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#define QT2160_CMD_GPIOS 6 |
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#define QT2160_CMD_SUBVER 7 |
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#define QT2160_CMD_CALIBRATE 10 |
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#define QT2160_CMD_DRIVE_X 70 |
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#define QT2160_CMD_PWMEN_X 74 |
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#define QT2160_CMD_PWM_DUTY 76 |
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#define QT2160_NUM_LEDS_X 8 |
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#define QT2160_CYCLE_INTERVAL (2*HZ) |
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static unsigned char qt2160_key2code[] = { |
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KEY_0, KEY_1, KEY_2, KEY_3, |
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KEY_4, KEY_5, KEY_6, KEY_7, |
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KEY_8, KEY_9, KEY_A, KEY_B, |
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KEY_C, KEY_D, KEY_E, KEY_F, |
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}; |
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#ifdef CONFIG_LEDS_CLASS |
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struct qt2160_led { |
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struct qt2160_data *qt2160; |
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struct led_classdev cdev; |
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char name[32]; |
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int id; |
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enum led_brightness brightness; |
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}; |
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#endif |
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struct qt2160_data { |
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struct i2c_client *client; |
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struct input_dev *input; |
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struct delayed_work dwork; |
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unsigned short keycodes[ARRAY_SIZE(qt2160_key2code)]; |
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u16 key_matrix; |
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#ifdef CONFIG_LEDS_CLASS |
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struct qt2160_led leds[QT2160_NUM_LEDS_X]; |
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#endif |
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}; |
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static int qt2160_read(struct i2c_client *client, u8 reg); |
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static int qt2160_write(struct i2c_client *client, u8 reg, u8 data); |
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#ifdef CONFIG_LEDS_CLASS |
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static int qt2160_led_set(struct led_classdev *cdev, |
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enum led_brightness value) |
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{ |
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struct qt2160_led *led = container_of(cdev, struct qt2160_led, cdev); |
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struct qt2160_data *qt2160 = led->qt2160; |
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struct i2c_client *client = qt2160->client; |
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u32 drive, pwmen; |
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if (value != led->brightness) { |
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drive = qt2160_read(client, QT2160_CMD_DRIVE_X); |
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pwmen = qt2160_read(client, QT2160_CMD_PWMEN_X); |
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if (value != LED_OFF) { |
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drive |= BIT(led->id); |
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pwmen |= BIT(led->id); |
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} else { |
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drive &= ~BIT(led->id); |
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pwmen &= ~BIT(led->id); |
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} |
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qt2160_write(client, QT2160_CMD_DRIVE_X, drive); |
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qt2160_write(client, QT2160_CMD_PWMEN_X, pwmen); |
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/* |
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* Changing this register will change the brightness |
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* of every LED in the qt2160. It's a HW limitation. |
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*/ |
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if (value != LED_OFF) |
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qt2160_write(client, QT2160_CMD_PWM_DUTY, value); |
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led->brightness = value; |
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} |
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return 0; |
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} |
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#endif /* CONFIG_LEDS_CLASS */ |
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static int qt2160_read_block(struct i2c_client *client, |
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u8 inireg, u8 *buffer, unsigned int count) |
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{ |
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int error, idx = 0; |
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/* |
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* Can't use SMBus block data read. Check for I2C functionality to speed |
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* things up whenever possible. Otherwise we will be forced to read |
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* sequentially. |
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*/ |
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if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
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error = i2c_smbus_write_byte(client, inireg + idx); |
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if (error) { |
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dev_err(&client->dev, |
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"couldn't send request. Returned %d\n", error); |
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return error; |
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} |
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error = i2c_master_recv(client, buffer, count); |
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if (error != count) { |
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dev_err(&client->dev, |
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"couldn't read registers. Returned %d bytes\n", error); |
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return error; |
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} |
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} else { |
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while (count--) { |
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int data; |
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error = i2c_smbus_write_byte(client, inireg + idx); |
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if (error) { |
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dev_err(&client->dev, |
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"couldn't send request. Returned %d\n", error); |
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return error; |
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} |
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data = i2c_smbus_read_byte(client); |
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if (data < 0) { |
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dev_err(&client->dev, |
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"couldn't read register. Returned %d\n", data); |
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return data; |
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} |
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buffer[idx++] = data; |
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} |
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} |
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return 0; |
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} |
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static int qt2160_get_key_matrix(struct qt2160_data *qt2160) |
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{ |
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struct i2c_client *client = qt2160->client; |
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struct input_dev *input = qt2160->input; |
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u8 regs[6]; |
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u16 old_matrix, new_matrix; |
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int ret, i, mask; |
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dev_dbg(&client->dev, "requesting keys...\n"); |
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/* |
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* Read all registers from General Status Register |
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* to GPIOs register |
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*/ |
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ret = qt2160_read_block(client, QT2160_CMD_GSTAT, regs, 6); |
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if (ret) { |
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dev_err(&client->dev, |
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"could not perform chip read.\n"); |
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return ret; |
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} |
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old_matrix = qt2160->key_matrix; |
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qt2160->key_matrix = new_matrix = (regs[2] << 8) | regs[1]; |
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mask = 0x01; |
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for (i = 0; i < 16; ++i, mask <<= 1) { |
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int keyval = new_matrix & mask; |
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if ((old_matrix & mask) != keyval) { |
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input_report_key(input, qt2160->keycodes[i], keyval); |
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dev_dbg(&client->dev, "key %d %s\n", |
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i, keyval ? "pressed" : "released"); |
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} |
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} |
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input_sync(input); |
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return 0; |
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} |
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static irqreturn_t qt2160_irq(int irq, void *_qt2160) |
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{ |
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struct qt2160_data *qt2160 = _qt2160; |
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mod_delayed_work(system_wq, &qt2160->dwork, 0); |
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return IRQ_HANDLED; |
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} |
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static void qt2160_schedule_read(struct qt2160_data *qt2160) |
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{ |
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schedule_delayed_work(&qt2160->dwork, QT2160_CYCLE_INTERVAL); |
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} |
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static void qt2160_worker(struct work_struct *work) |
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{ |
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struct qt2160_data *qt2160 = |
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container_of(work, struct qt2160_data, dwork.work); |
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dev_dbg(&qt2160->client->dev, "worker\n"); |
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qt2160_get_key_matrix(qt2160); |
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/* Avoid device lock up by checking every so often */ |
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qt2160_schedule_read(qt2160); |
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} |
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static int qt2160_read(struct i2c_client *client, u8 reg) |
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{ |
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int ret; |
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ret = i2c_smbus_write_byte(client, reg); |
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if (ret) { |
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dev_err(&client->dev, |
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"couldn't send request. Returned %d\n", ret); |
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return ret; |
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} |
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ret = i2c_smbus_read_byte(client); |
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if (ret < 0) { |
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dev_err(&client->dev, |
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"couldn't read register. Returned %d\n", ret); |
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return ret; |
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} |
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return ret; |
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} |
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static int qt2160_write(struct i2c_client *client, u8 reg, u8 data) |
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{ |
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int ret; |
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ret = i2c_smbus_write_byte_data(client, reg, data); |
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if (ret < 0) |
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dev_err(&client->dev, |
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"couldn't write data. Returned %d\n", ret); |
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return ret; |
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} |
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#ifdef CONFIG_LEDS_CLASS |
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static int qt2160_register_leds(struct qt2160_data *qt2160) |
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{ |
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struct i2c_client *client = qt2160->client; |
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int ret; |
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int i; |
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for (i = 0; i < QT2160_NUM_LEDS_X; i++) { |
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struct qt2160_led *led = &qt2160->leds[i]; |
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snprintf(led->name, sizeof(led->name), "qt2160:x%d", i); |
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led->cdev.name = led->name; |
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led->cdev.brightness_set_blocking = qt2160_led_set; |
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led->cdev.brightness = LED_OFF; |
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led->id = i; |
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led->qt2160 = qt2160; |
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ret = led_classdev_register(&client->dev, &led->cdev); |
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if (ret < 0) |
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return ret; |
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} |
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/* Tur off LEDs */ |
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qt2160_write(client, QT2160_CMD_DRIVE_X, 0); |
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qt2160_write(client, QT2160_CMD_PWMEN_X, 0); |
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qt2160_write(client, QT2160_CMD_PWM_DUTY, 0); |
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return 0; |
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} |
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static void qt2160_unregister_leds(struct qt2160_data *qt2160) |
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{ |
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int i; |
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for (i = 0; i < QT2160_NUM_LEDS_X; i++) |
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led_classdev_unregister(&qt2160->leds[i].cdev); |
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} |
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#else |
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static inline int qt2160_register_leds(struct qt2160_data *qt2160) |
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{ |
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return 0; |
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} |
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static inline void qt2160_unregister_leds(struct qt2160_data *qt2160) |
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{ |
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} |
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#endif |
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static bool qt2160_identify(struct i2c_client *client) |
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{ |
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int id, ver, rev; |
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/* Read Chid ID to check if chip is valid */ |
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id = qt2160_read(client, QT2160_CMD_CHIPID); |
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if (id != QT2160_VALID_CHIPID) { |
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dev_err(&client->dev, "ID %d not supported\n", id); |
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return false; |
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} |
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/* Read chip firmware version */ |
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ver = qt2160_read(client, QT2160_CMD_CODEVER); |
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if (ver < 0) { |
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dev_err(&client->dev, "could not get firmware version\n"); |
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return false; |
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} |
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/* Read chip firmware revision */ |
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rev = qt2160_read(client, QT2160_CMD_SUBVER); |
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if (rev < 0) { |
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dev_err(&client->dev, "could not get firmware revision\n"); |
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return false; |
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} |
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dev_info(&client->dev, "AT42QT2160 firmware version %d.%d.%d\n", |
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ver >> 4, ver & 0xf, rev); |
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return true; |
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} |
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static int qt2160_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct qt2160_data *qt2160; |
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struct input_dev *input; |
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int i; |
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int error; |
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/* Check functionality */ |
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error = i2c_check_functionality(client->adapter, |
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I2C_FUNC_SMBUS_BYTE); |
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if (!error) { |
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dev_err(&client->dev, "%s adapter not supported\n", |
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dev_driver_string(&client->adapter->dev)); |
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return -ENODEV; |
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} |
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if (!qt2160_identify(client)) |
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return -ENODEV; |
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/* Chip is valid and active. Allocate structure */ |
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qt2160 = kzalloc(sizeof(struct qt2160_data), GFP_KERNEL); |
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input = input_allocate_device(); |
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if (!qt2160 || !input) { |
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dev_err(&client->dev, "insufficient memory\n"); |
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error = -ENOMEM; |
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goto err_free_mem; |
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} |
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qt2160->client = client; |
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qt2160->input = input; |
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INIT_DELAYED_WORK(&qt2160->dwork, qt2160_worker); |
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input->name = "AT42QT2160 Touch Sense Keyboard"; |
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input->id.bustype = BUS_I2C; |
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input->keycode = qt2160->keycodes; |
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input->keycodesize = sizeof(qt2160->keycodes[0]); |
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input->keycodemax = ARRAY_SIZE(qt2160_key2code); |
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__set_bit(EV_KEY, input->evbit); |
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__clear_bit(EV_REP, input->evbit); |
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for (i = 0; i < ARRAY_SIZE(qt2160_key2code); i++) { |
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qt2160->keycodes[i] = qt2160_key2code[i]; |
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__set_bit(qt2160_key2code[i], input->keybit); |
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} |
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__clear_bit(KEY_RESERVED, input->keybit); |
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/* Calibrate device */ |
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error = qt2160_write(client, QT2160_CMD_CALIBRATE, 1); |
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if (error) { |
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dev_err(&client->dev, "failed to calibrate device\n"); |
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goto err_free_mem; |
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} |
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if (client->irq) { |
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error = request_irq(client->irq, qt2160_irq, |
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IRQF_TRIGGER_FALLING, "qt2160", qt2160); |
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if (error) { |
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dev_err(&client->dev, |
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"failed to allocate irq %d\n", client->irq); |
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goto err_free_mem; |
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} |
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} |
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error = qt2160_register_leds(qt2160); |
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if (error) { |
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dev_err(&client->dev, "Failed to register leds\n"); |
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goto err_free_irq; |
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} |
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error = input_register_device(qt2160->input); |
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if (error) { |
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dev_err(&client->dev, |
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"Failed to register input device\n"); |
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goto err_unregister_leds; |
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} |
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i2c_set_clientdata(client, qt2160); |
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qt2160_schedule_read(qt2160); |
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return 0; |
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err_unregister_leds: |
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qt2160_unregister_leds(qt2160); |
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err_free_irq: |
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if (client->irq) |
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free_irq(client->irq, qt2160); |
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err_free_mem: |
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input_free_device(input); |
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kfree(qt2160); |
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return error; |
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} |
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static int qt2160_remove(struct i2c_client *client) |
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{ |
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struct qt2160_data *qt2160 = i2c_get_clientdata(client); |
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qt2160_unregister_leds(qt2160); |
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/* Release IRQ so no queue will be scheduled */ |
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if (client->irq) |
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free_irq(client->irq, qt2160); |
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cancel_delayed_work_sync(&qt2160->dwork); |
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input_unregister_device(qt2160->input); |
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kfree(qt2160); |
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return 0; |
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} |
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static const struct i2c_device_id qt2160_idtable[] = { |
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{ "qt2160", 0, }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, qt2160_idtable); |
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static struct i2c_driver qt2160_driver = { |
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.driver = { |
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.name = "qt2160", |
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}, |
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.id_table = qt2160_idtable, |
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.probe = qt2160_probe, |
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.remove = qt2160_remove, |
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}; |
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module_i2c_driver(qt2160_driver); |
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MODULE_AUTHOR("Raphael Derosso Pereira <[email protected]>"); |
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MODULE_DESCRIPTION("Driver for AT42QT2160 Touch Sensor"); |
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MODULE_LICENSE("GPL");
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