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241 lines
6.8 KiB
241 lines
6.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Driver for MAXI MAX11801 - A Resistive touch screen controller with |
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* i2c interface |
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* |
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* Copyright (C) 2011 Freescale Semiconductor, Inc. |
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* Author: Zhang Jiejing <[email protected]> |
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* |
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* Based on mcs5000_ts.c |
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*/ |
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/* |
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* This driver aims to support the series of MAXI touch chips max11801 |
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* through max11803. The main difference between these 4 chips can be |
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* found in the table below: |
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* ----------------------------------------------------- |
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* | CHIP | AUTO MODE SUPPORT(FIFO) | INTERFACE | |
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* |----------------------------------------------------| |
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* | max11800 | YES | SPI | |
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* | max11801 | YES | I2C | |
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* | max11802 | NO | SPI | |
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* | max11803 | NO | I2C | |
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* ------------------------------------------------------ |
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* |
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* Currently, this driver only supports max11801. |
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* |
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* Data Sheet: |
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* http://www.maxim-ic.com/datasheet/index.mvp/id/5943 |
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*/ |
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#include <linux/module.h> |
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#include <linux/i2c.h> |
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#include <linux/interrupt.h> |
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#include <linux/input.h> |
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#include <linux/slab.h> |
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#include <linux/bitops.h> |
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/* Register Address define */ |
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#define GENERNAL_STATUS_REG 0x00 |
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#define GENERNAL_CONF_REG 0x01 |
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#define MESURE_RES_CONF_REG 0x02 |
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#define MESURE_AVER_CONF_REG 0x03 |
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#define ADC_SAMPLE_TIME_CONF_REG 0x04 |
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#define PANEL_SETUPTIME_CONF_REG 0x05 |
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#define DELAY_CONVERSION_CONF_REG 0x06 |
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#define TOUCH_DETECT_PULLUP_CONF_REG 0x07 |
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#define AUTO_MODE_TIME_CONF_REG 0x08 /* only for max11800/max11801 */ |
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#define APERTURE_CONF_REG 0x09 /* only for max11800/max11801 */ |
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#define AUX_MESURE_CONF_REG 0x0a |
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#define OP_MODE_CONF_REG 0x0b |
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/* FIFO is found only in max11800 and max11801 */ |
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#define FIFO_RD_CMD (0x50 << 1) |
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#define MAX11801_FIFO_INT (1 << 2) |
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#define MAX11801_FIFO_OVERFLOW (1 << 3) |
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#define XY_BUFSIZE 4 |
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#define XY_BUF_OFFSET 4 |
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#define MAX11801_MAX_X 0xfff |
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#define MAX11801_MAX_Y 0xfff |
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#define MEASURE_TAG_OFFSET 2 |
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#define MEASURE_TAG_MASK (3 << MEASURE_TAG_OFFSET) |
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#define EVENT_TAG_OFFSET 0 |
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#define EVENT_TAG_MASK (3 << EVENT_TAG_OFFSET) |
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#define MEASURE_X_TAG (0 << MEASURE_TAG_OFFSET) |
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#define MEASURE_Y_TAG (1 << MEASURE_TAG_OFFSET) |
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/* These are the state of touch event state machine */ |
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enum { |
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EVENT_INIT, |
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EVENT_MIDDLE, |
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EVENT_RELEASE, |
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EVENT_FIFO_END |
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}; |
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struct max11801_data { |
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struct i2c_client *client; |
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struct input_dev *input_dev; |
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}; |
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static u8 read_register(struct i2c_client *client, int addr) |
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{ |
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/* XXX: The chip ignores LSB of register address */ |
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return i2c_smbus_read_byte_data(client, addr << 1); |
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} |
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static int max11801_write_reg(struct i2c_client *client, int addr, int data) |
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{ |
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/* XXX: The chip ignores LSB of register address */ |
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return i2c_smbus_write_byte_data(client, addr << 1, data); |
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} |
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static irqreturn_t max11801_ts_interrupt(int irq, void *dev_id) |
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{ |
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struct max11801_data *data = dev_id; |
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struct i2c_client *client = data->client; |
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int status, i, ret; |
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u8 buf[XY_BUFSIZE]; |
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int x = -1; |
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int y = -1; |
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status = read_register(data->client, GENERNAL_STATUS_REG); |
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if (status & (MAX11801_FIFO_INT | MAX11801_FIFO_OVERFLOW)) { |
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status = read_register(data->client, GENERNAL_STATUS_REG); |
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ret = i2c_smbus_read_i2c_block_data(client, FIFO_RD_CMD, |
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XY_BUFSIZE, buf); |
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/* |
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* We should get 4 bytes buffer that contains X,Y |
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* and event tag |
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*/ |
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if (ret < XY_BUFSIZE) |
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goto out; |
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for (i = 0; i < XY_BUFSIZE; i += XY_BUFSIZE / 2) { |
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if ((buf[i + 1] & MEASURE_TAG_MASK) == MEASURE_X_TAG) |
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x = (buf[i] << XY_BUF_OFFSET) + |
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(buf[i + 1] >> XY_BUF_OFFSET); |
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else if ((buf[i + 1] & MEASURE_TAG_MASK) == MEASURE_Y_TAG) |
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y = (buf[i] << XY_BUF_OFFSET) + |
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(buf[i + 1] >> XY_BUF_OFFSET); |
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} |
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if ((buf[1] & EVENT_TAG_MASK) != (buf[3] & EVENT_TAG_MASK)) |
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goto out; |
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switch (buf[1] & EVENT_TAG_MASK) { |
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case EVENT_INIT: |
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case EVENT_MIDDLE: |
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input_report_abs(data->input_dev, ABS_X, x); |
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input_report_abs(data->input_dev, ABS_Y, y); |
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input_event(data->input_dev, EV_KEY, BTN_TOUCH, 1); |
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input_sync(data->input_dev); |
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break; |
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case EVENT_RELEASE: |
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input_event(data->input_dev, EV_KEY, BTN_TOUCH, 0); |
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input_sync(data->input_dev); |
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break; |
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case EVENT_FIFO_END: |
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break; |
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} |
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} |
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out: |
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return IRQ_HANDLED; |
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} |
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static void max11801_ts_phy_init(struct max11801_data *data) |
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{ |
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struct i2c_client *client = data->client; |
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/* Average X,Y, take 16 samples, average eight media sample */ |
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max11801_write_reg(client, MESURE_AVER_CONF_REG, 0xff); |
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/* X,Y panel setup time set to 20us */ |
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max11801_write_reg(client, PANEL_SETUPTIME_CONF_REG, 0x11); |
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/* Rough pullup time (2uS), Fine pullup time (10us) */ |
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max11801_write_reg(client, TOUCH_DETECT_PULLUP_CONF_REG, 0x10); |
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/* Auto mode init period = 5ms , scan period = 5ms*/ |
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max11801_write_reg(client, AUTO_MODE_TIME_CONF_REG, 0xaa); |
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/* Aperture X,Y set to +- 4LSB */ |
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max11801_write_reg(client, APERTURE_CONF_REG, 0x33); |
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/* Enable Power, enable Automode, enable Aperture, enable Average X,Y */ |
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max11801_write_reg(client, OP_MODE_CONF_REG, 0x36); |
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} |
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static int max11801_ts_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct max11801_data *data; |
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struct input_dev *input_dev; |
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int error; |
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data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); |
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input_dev = devm_input_allocate_device(&client->dev); |
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if (!data || !input_dev) { |
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dev_err(&client->dev, "Failed to allocate memory\n"); |
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return -ENOMEM; |
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} |
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data->client = client; |
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data->input_dev = input_dev; |
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input_dev->name = "max11801_ts"; |
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input_dev->id.bustype = BUS_I2C; |
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input_dev->dev.parent = &client->dev; |
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__set_bit(EV_ABS, input_dev->evbit); |
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__set_bit(EV_KEY, input_dev->evbit); |
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__set_bit(BTN_TOUCH, input_dev->keybit); |
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input_set_abs_params(input_dev, ABS_X, 0, MAX11801_MAX_X, 0, 0); |
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input_set_abs_params(input_dev, ABS_Y, 0, MAX11801_MAX_Y, 0, 0); |
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max11801_ts_phy_init(data); |
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error = devm_request_threaded_irq(&client->dev, client->irq, NULL, |
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max11801_ts_interrupt, |
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IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
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"max11801_ts", data); |
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if (error) { |
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dev_err(&client->dev, "Failed to register interrupt\n"); |
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return error; |
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} |
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error = input_register_device(data->input_dev); |
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if (error) |
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return error; |
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return 0; |
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} |
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static const struct i2c_device_id max11801_ts_id[] = { |
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{"max11801", 0}, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, max11801_ts_id); |
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static const struct of_device_id max11801_ts_dt_ids[] = { |
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{ .compatible = "maxim,max11801" }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, max11801_ts_dt_ids); |
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static struct i2c_driver max11801_ts_driver = { |
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.driver = { |
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.name = "max11801_ts", |
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.of_match_table = max11801_ts_dt_ids, |
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}, |
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.id_table = max11801_ts_id, |
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.probe = max11801_ts_probe, |
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}; |
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module_i2c_driver(max11801_ts_driver); |
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MODULE_AUTHOR("Zhang Jiejing <[email protected]>"); |
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MODULE_DESCRIPTION("Touchscreen driver for MAXI MAX11801 controller"); |
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MODULE_LICENSE("GPL");
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