// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2021 Rockchip Electronics Co. Ltd.
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*
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* Author: Kay Guo <kay.guo@rock-chips.com>
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*/
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#include <linux/atomic.h>
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#include <linux/delay.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/freezer.h>
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#include <linux/gpio.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/miscdevice.h>
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#include <linux/of_gpio.h>
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#include <linux/sensor-dev.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/workqueue.h>
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#define STK_STATE 0x00
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#define PS_CTRL 0x01
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#define ALS_CTRL1 0x02
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#define LED_CTRL 0x03
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#define INT_CTRL1 0x04
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#define STK_WAIT 0x05
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#define THDH1_PS 0x06
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#define THDH2_PS 0x07
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#define THDL1_PS 0x08
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#define THDL2_PS 0x09
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#define THDH1_ALS 0x0A
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#define THDH2_ALS 0x0B
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#define THDL1_ALS 0x0C
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#define THDL2_ALS 0x0D
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#define STK_FLAG 0x10
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#define DATA1_PS 0x11
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#define DATA2_PS 0x12
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#define DATA1_ALS 0x13
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#define DATA2_ALS 0x14
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#define DATA1_C 0x1B
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#define DATA2_C 0x1C
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#define DATA1_PS_OFFSET 0x1D
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#define DATA2_PS_OFFSET 0x1E
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#define DATA_CTRL1 0x20
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#define DATA_CTRL2 0x21
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#define DATA_CTRL3 0x22
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#define DATA_CTRL4 0x23
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#define STKPDT_ID 0x3E
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#define STK_RESERVED 0x3F
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#define ALS_CTRL2 0x4E
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#define INTELLI_WAIT 0x4F
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#define SOFT_RESET 0x80
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#define PSPD_CTRL 0xA1
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#define INT_CTRL2 0xA5
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/* STK_STATE 0x00 */
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#define PS_DISABLE (0 << 0)
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#define PS_ENABLE (1 << 0)
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#define ALS_DISABLE (0 << 1)
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#define ALS_ENABLE (1 << 1)
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#define WAIT_DISABLE (0 << 2)
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#define WAIT_ENABLE (1 << 2)
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#define INTELLI_DISABLE (0 << 3)
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#define INTELLI_ENABLE (1 << 3)
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#define CTAUTOK_DISABLE (0 << 4)
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#define CTAUTOK_ENABLE (1 << 4)
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/* PS/GS_CTRL 0x01 */
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#define PS_IT_96US (0 << 0)
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#define PS_IT_192US (1 << 0)
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#define PS_IT_384US (2 << 0)
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#define PS_IT_768US (3 << 0)
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#define PS_IT_1MS54 (4 << 0)
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#define PS_IT_3MS07 (5 << 0)
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#define PS_IT_6MS14 (6 << 0)
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#define PS_GAIN_1G (0 << 4)
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#define PS_GAIN_2G (1 << 4)
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#define PS_GAIN_4G (2 << 4)
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#define PS_GAIN_8G (3 << 4)
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#define PS_PRST_1T (0 << 6)
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#define PS_PRST_2T (1 << 6)
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#define PS_PRST_4T (2 << 6)
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#define PS_PRST_16T (3 << 6)
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/* ALS_CTRL1 0x02 */
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#define ALS_REFT_MS (1 << 0)/* [3:0] 25 ms, default value is 50ms */
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#define ALS_GAIN_1G (0 << 4)
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#define ALS_GAIN_4G (1 << 4)
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#define ALS_GAIN_16G (2 << 4)
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#define ALS_GAIN_64G (3 << 4)
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#define ALS_PRST_1T (0 << 6)
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#define ALS_PRST_2T (1 << 6)
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#define ALS_PRST_4T (2 << 6)
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#define ALS_PRST_8T (3 << 6)
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/* LED_CTRL 0x03 */
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#define LED_CTIR_EN 0x03 /* [5:0] 2.89us , default value is 0.185ms */
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#define CTIR_DISABLE (0 << 0)
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#define CTIR_ENABLE (1 << 0)
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#define CTIRFC_DISABLE (0 << 1)
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#define CTIRFC_ENABLE (1 << 1)
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#define LED_CUR_12MA (2 << 5)
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#define LED_CUR_25MA (3 << 5)
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#define LED_CUR_50MA (4 << 5)
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#define LED_CUR_100MA (5 << 5)
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#define LED_CUR_150MA (6 << 5)
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/* INT 0x04 */
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#define PS_INT_DISABLE (0 << 0)
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#define PS_INT_ENABLE (1 << 0)
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#define PS_INT_ENABLE_FLGNFH (2 << 0)
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#define PS_INT_ENABLE_FLGNFL (3 << 0)
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#define PS_INT_MODE_ENABLE (4 << 0)
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#define PS_INT_ENABLE_THL (5 << 0)
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#define PS_INT_ENABLE_THH (6 << 0)
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#define PS_INT_ENABLE_THHL (7 << 0)
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#define ALS_INT_DISABLE (0 << 3)
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#define ALS_INT_ENABLE (1 << 3)
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#define INT_CTRL_PS_OR_LS (0 << 7)
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#define INT_CTRL_PS_AND_LS (1 << 7)
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/* FLAG 0x10 */
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#define STK_FLAG_NF (1 << 0)
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#define STK_FLAG_INPS_INT (1 << 1)
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#define STK_FLAG_ALS_STATE (1 << 2)
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#define STK_FLAG_PS_INT (1 << 4)
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#define STK_FLAG_ALS_INT (1 << 5)
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#define STK_FLAG_PSDR (1 << 6)
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#define STK_FLAG_ALSDR (1 << 7)
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static int ps_threshold_low;
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static int ps_threshold_high;
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static int val_flag;
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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 = ~PS_ENABLE;
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sensor->ops->ctrl_data &= status;
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} else {
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status = PS_ENABLE;
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sensor->ops->ctrl_data |= status;
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}
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dev_dbg(&client->dev, "reg=0x%x, reg_ctrl=0x%x, enable=%d\n",
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sensor->ops->ctrl_reg, sensor->ops->ctrl_data, enable);
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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 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 result = 0;
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int val = 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:sensor active fail\n", __func__);
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return result;
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}
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sensor->status_cur = SENSOR_OFF;
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result = of_property_read_u32(np, "ps_threshold_low", &ps_val);
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if (result)
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dev_err(&client->dev, "%s:Unable to read ps_threshold_low\n",
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__func__);
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ps_threshold_low = ps_val;
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result = sensor_write_reg(client, THDL1_PS,
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(unsigned char)(ps_val >> 8));
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if (result) {
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dev_err(&client->dev, "%s:write THDL1_PS fail\n", __func__);
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return result;
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}
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result = sensor_write_reg(client, THDL2_PS, (unsigned char)ps_val);
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if (result) {
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dev_err(&client->dev, "%s:write THDL1_PS fail\n", __func__);
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return result;
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}
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result = of_property_read_u32(np, "ps_threshold_high", &ps_val);
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if (result)
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dev_err(&client->dev, "%s:Unable to read ps_threshold_high\n",
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__func__);
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ps_threshold_high = ps_val;
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result = sensor_write_reg(client, THDH1_PS,
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(unsigned char)(ps_val >> 8));
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if (result) {
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dev_err(&client->dev, "%s:write THDH1_PS fail\n", __func__);
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return result;
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}
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result = sensor_write_reg(client, THDH2_PS, (unsigned char)ps_val);
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if (result) {
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dev_err(&client->dev, "%s:write THDH1_PS fail\n", __func__);
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return result;
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}
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result = of_property_read_u32(np, "ps_ctrl_gain", &ps_val);
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if (result)
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dev_err(&client->dev, "%s:Unable to read ps_ctrl_gain\n",
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__func__);
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result = sensor_write_reg(client, PS_CTRL,
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(unsigned char)((ps_val << 4) | PS_IT_384US));
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if (result) {
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dev_err(&client->dev, "%s:write PS_CTRL fail\n", __func__);
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return result;
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}
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result = of_property_read_u32(np, "ps_led_current", &ps_val);
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if (result)
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dev_err(&client->dev, "%s:Unable to read ps_led_current\n",
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__func__);
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result = sensor_write_reg(client, LED_CTRL,
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(unsigned char)((ps_val << 5) | LED_CTIR_EN));
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if (result) {
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dev_err(&client->dev, "%s:write LED_CTRL fail\n", __func__);
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return result;
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}
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val = sensor_read_reg(client, INT_CTRL1);
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val &= ~INT_CTRL_PS_AND_LS;
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if (sensor->pdata->irq_enable)
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val |= PS_INT_ENABLE_FLGNFL;
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else
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val &= PS_INT_DISABLE;
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result = sensor_write_reg(client, INT_CTRL1, val);
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if (result) {
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dev_err(&client->dev, "%s:write INT_CTRL fail\n", __func__);
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return result;
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}
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return result;
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}
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static int stk3332_get_ps_value(int ps)
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{
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int index = 0;
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if ((ps > ps_threshold_high) && (val_flag == 0)) {
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index = 1;
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val_flag = 1;
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} else if ((ps < ps_threshold_low) && (val_flag == 1)) {
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index = 0;
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val_flag = 0;
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} else {
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index = -1;
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}
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return index;
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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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int value = 0;
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char buffer[2] = { 0 };
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int index = 1;
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if (sensor->ops->read_len < 2) {
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dev_err(&client->dev, "%s:length is error, len=%d\n", __func__,
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sensor->ops->read_len);
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return -EINVAL;
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}
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buffer[0] = sensor->ops->read_reg;
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result = sensor_rx_data(client, buffer, sensor->ops->read_len);
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if (result) {
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dev_err(&client->dev, "%s:sensor read data fail\n", __func__);
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return result;
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}
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value = (buffer[0] << 8) | buffer[1];
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if (sensor->pdata->irq_enable && sensor->ops->int_status_reg) {
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value = sensor_read_reg(client, sensor->ops->int_status_reg);
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if (value & STK_FLAG_NF)
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index = 0;
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else
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index = 1;
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input_report_abs(sensor->input_dev, ABS_DISTANCE, index);
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input_sync(sensor->input_dev);
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value &= ~STK_FLAG_PS_INT;
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result = sensor_write_reg(client,
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sensor->ops->int_status_reg,
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value);
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dev_dbg(&client->dev, "%s object near = %d", sensor->ops->name, index);
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if (result) {
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dev_err(&client->dev, "write status reg error\n");
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return result;
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}
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} else if (!sensor->pdata->irq_enable) {
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index = stk3332_get_ps_value(value);
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if (index >= 0) {
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input_report_abs(sensor->input_dev, ABS_DISTANCE, index);
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input_sync(sensor->input_dev);
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dev_dbg(&client->dev, "%s sensor closed=%d\n",
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sensor->ops->name, index);
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}
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}
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return result;
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}
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static struct sensor_operate psensor_stk3332_ops = {
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.name = "ps_stk3332",
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.type = SENSOR_TYPE_PROXIMITY,
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.id_i2c = PROXIMITY_ID_STK3332,
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.read_reg = DATA1_PS,
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.read_len = 2,
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.id_reg = SENSOR_UNKNOW_DATA,
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.id_data = SENSOR_UNKNOW_DATA,
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.precision = 16,
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.ctrl_reg = STK_STATE,
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.int_status_reg = STK_FLAG,
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.range = { 100, 65535 },
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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_stk3332_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_stk3332_ops);
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}
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static int proximity_stk3332_remove(struct i2c_client *client)
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{
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return sensor_unregister_device(client, NULL, &psensor_stk3332_ops);
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}
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static const struct i2c_device_id proximity_stk3332_id[] = {
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{ "ps_stk3332", PROXIMITY_ID_STK3332 },
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{}
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};
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static struct i2c_driver proximity_stk3332_driver = {
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.probe = proximity_stk3332_probe,
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.remove = proximity_stk3332_remove,
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.shutdown = sensor_shutdown,
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.id_table = proximity_stk3332_id,
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.driver = {
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.name = "proximity_stk3332",
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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_stk3332_driver);
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MODULE_AUTHOR("Kay Guo<yangbin@rock-chips.com>");
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MODULE_DESCRIPTION("stk3332 proximity driver");
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MODULE_LICENSE("GPL");
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