// SPDX-License-Identifier: GPL-2.0
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/*
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* kernel/drivers/input/sensors/psensor/ps_em3071x.c
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*
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* Copyright (C) 2020 Rockchip Co.,Ltd.
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* Author: Wang Jie <dave.wang@rock-chips.com>
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*/
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/irq.h>
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#include <linux/miscdevice.h>
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#include <linux/gpio.h>
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#include <linux/uaccess.h>
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#include <linux/atomic.h>
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#include <linux/delay.h>
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#include <linux/input.h>
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#include <linux/workqueue.h>
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#include <linux/freezer.h>
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#include <linux/of_gpio.h>
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#ifdef CONFIG_HAS_EARLYSUSPEND
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#include <linux/earlysuspend.h>
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#endif
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#include <linux/sensor-dev.h>
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#define EM3071X_CONFIG_REG 0x01
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#define EM3071X_INT_REG 0x02
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#define EM3071X_PS_L_REG 0x03
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#define EM3071X_PS_H_REG 0x04
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#define EM3071X_PS_REG 0x08
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#define EM3071X_INT_PMASK 0x80
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#define EM3071X_PS_OFFSET 0x0F
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#define EM3071X_PS_CONFIG 0xB0
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/* #define ps_threshold_low 0x30 */
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/* #define ps_threshold_high 0x40 */
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#define EM3071X_INT_CLEAR 0x00
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static int ps_threshold_low;
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static int ps_threshold_high;
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static int em3071x_get_object(struct i2c_client *client)
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{
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int index = 0;
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int val;
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val = sensor_read_reg(client, EM3071X_PS_REG);
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if (val >= ps_threshold_high) {
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index = 0;
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val = 0;
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} else if (val <= ps_threshold_low) {
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index = 1;
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val = 1;
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} else {
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index = val;
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}
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dev_dbg(&client->dev,
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"%s: val = 0x%x, index = %d\n", __func__, val, index);
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return index;
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}
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static int sensor_active(struct i2c_client *client, int enable, int rate)
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{
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struct sensor_private_data *sensor =
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(struct sensor_private_data *) i2c_get_clientdata(client);
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int result = 0;
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int status = 0;
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sensor->ops->ctrl_data = sensor_read_reg(client, sensor->ops->ctrl_reg);
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if (enable) {
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status = EM3071X_PS_CONFIG;
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sensor->ops->ctrl_data |= status;
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} else {
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status = ~EM3071X_PS_CONFIG;
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sensor->ops->ctrl_data &= status;
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}
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result = sensor_write_reg(client, sensor->ops->ctrl_reg,
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sensor->ops->ctrl_data);
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if (result)
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dev_err(&client->dev, "%s: fail to active sensor\n", __func__);
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return result;
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}
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static int em3071x_set_threshold(struct i2c_client *client,
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int threshold_high, int threshold_low)
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{
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int result = 0;
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result = sensor_write_reg(client, EM3071X_PS_L_REG, threshold_low);
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if (result) {
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dev_err(&client->dev,
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"%s: fail to write EM3071X_PS_L_REG(%d)\n",
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__func__, result);
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return result;
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}
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result = sensor_write_reg(client, EM3071X_PS_H_REG, threshold_high);
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if (result) {
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dev_err(&client->dev,
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"%s: fail to write EM3071X_PS_H_REG(%d)\n",
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__func__, result);
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return result;
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}
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dev_dbg(&client->dev,
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"%s: set threshold_high = %d, set threshold_low = %d\n",
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__func__, threshold_high, threshold_low);
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return result;
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}
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static int sensor_init(struct i2c_client *client)
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{
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struct sensor_private_data *sensor =
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(struct sensor_private_data *) i2c_get_clientdata(client);
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struct device_node *np = client->dev.of_node;
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int ps_val = 0;
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int ret = 0;
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int result = 0;
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result = sensor->ops->active(client, 0, 0);
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if (result) {
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dev_err(&client->dev, "%s: line = %d, result = %d.\n",
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__func__, __LINE__, result);
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return result;
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}
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sensor->status_cur = SENSOR_OFF;
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/* initialize the EM3071X chip */
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result = sensor_write_reg(client, EM3071X_CONFIG_REG, 0X00);
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if (result) {
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dev_err(&client->dev,
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"%s: write EM3071X_CONFIG_REG reg fail(%d)\n",
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__func__, result);
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return result;
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}
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result = sensor_write_reg(client, EM3071X_INT_REG, EM3071X_INT_CLEAR);
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if (result) {
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dev_err(&client->dev,
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"%s: write EM3071X_INT_REG reg fail(%d)\n",
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__func__, result);
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return result;
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}
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result = sensor_write_reg(client, EM3071X_PS_OFFSET, 0X00);
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if (result) {
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dev_err(&client->dev,
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"%s: write EM3071X_PS_OFFSET reg fail(%d)\n",
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__func__, result);
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return result;
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}
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ret = of_property_read_u32(np, "ps_threshold_low", &ps_val);
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if (ret)
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dev_warn(&client->dev,
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"%s: Unable to get ps_threshold_low\n", __func__);
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ps_threshold_low = ps_val;
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ret = of_property_read_u32(np, "ps_threshold_high", &ps_val);
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if (ret)
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dev_warn(&client->dev,
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"%s: Unable to get ps_threshold_high\n", __func__);
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ps_threshold_high = ps_val;
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ret = em3071x_set_threshold(client,
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ps_threshold_high, ps_threshold_low);
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if (ret)
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dev_err(&client->dev,
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"%s: em3071x set threshold failed\n", __func__);
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return result;
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}
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static int em3071x_get_status(struct i2c_client *client)
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{
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struct sensor_private_data *sensor =
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(struct sensor_private_data *) i2c_get_clientdata(client);
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int val;
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val = sensor_read_reg(client, sensor->ops->int_status_reg);
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val &= 0x80;
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return val;
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}
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static int sensor_report_value(struct i2c_client *client)
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{
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struct sensor_private_data *sensor =
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(struct sensor_private_data *) i2c_get_clientdata(client);
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int result = 0;
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char value = 0;
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u8 status;
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status = em3071x_get_status(client);
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dev_dbg(&client->dev, "em3071x_get_status: status = 0x%x\n", status);
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if (sensor->pdata->irq_enable) {
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if (status & EM3071X_INT_PMASK) {
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result = sensor_write_reg(client, EM3071X_INT_REG, 0x00);
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if (result) {
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dev_err(&client->dev,
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"%s: write EM3071X_INT_REG reg fail(%d)\n", __func__, result);
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return result;
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}
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value = em3071x_get_object(client);
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input_report_abs(sensor->input_dev, ABS_DISTANCE, value);
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input_sync(sensor->input_dev);
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}
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} else {
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value = em3071x_get_object(client);
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input_report_abs(sensor->input_dev, ABS_DISTANCE, value);
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input_sync(sensor->input_dev);
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}
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return result;
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}
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static struct sensor_operate psensor_em3071x_ops = {
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.name = "ps_em3071x",
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.type = SENSOR_TYPE_PROXIMITY,
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.id_i2c = PROXIMITY_ID_EM3071X,
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.read_reg = SENSOR_UNKNOW_DATA,
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.read_len = 1,
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.id_reg = 0,
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.id_data = 0x31,
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.precision = 8,
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.ctrl_reg = 0x01,
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.int_status_reg = 0x02,
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.range = {0, 10},
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.brightness = {10, 255},
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.trig = IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
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.active = sensor_active,
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.init = sensor_init,
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.report = sensor_report_value,
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};
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static int proximity_em3071x_probe(struct i2c_client *client,
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const struct i2c_device_id *devid)
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{
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return sensor_register_device(client, NULL, devid, &psensor_em3071x_ops);
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}
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static int proximity_em3071x_remove(struct i2c_client *client)
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{
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return sensor_unregister_device(client, NULL, &psensor_em3071x_ops);
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}
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static const struct i2c_device_id proximity_em3071x_id[] = {
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{"ps_em3071x", PROXIMITY_ID_EM3071X},
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{}
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};
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static struct i2c_driver proximity_em3071x_driver = {
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.probe = proximity_em3071x_probe,
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.remove = proximity_em3071x_remove,
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.shutdown = sensor_shutdown,
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.id_table = proximity_em3071x_id,
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.driver = {
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.name = "proximity_em3071x",
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#ifdef CONFIG_PM
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.pm = &sensor_pm_ops,
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#endif
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},
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};
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module_i2c_driver(proximity_em3071x_driver);
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MODULE_AUTHOR("Wang Jie <dave.wang@rock-chips.com>");
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MODULE_DESCRIPTION("em3071x proximity driver");
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MODULE_LICENSE("GPL");
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