/*
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*
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* Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
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*
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* Authors: Bin Yang <yangbin@rock-chips.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 of
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* the License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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 STK_STATE 0x00
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#define PS_CTRL 0x01
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#define ALS_CTRL 0x02
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#define LED_CTRL 0x03
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#define INT_CTRL 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_OFFSET 0x15
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#define DATA2_OFFSET 0x16
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#define DATA1_IR 0x17
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#define DATA2_IR 0x18
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#define DATA1_GS0 0x24
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#define DATA2_GS0 0x25
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#define DATA1_GS1 0x26
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#define DATA2_GS1 0x27
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#define STKPDT_ID 0x3E
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#define SOFT_RESET 0x80
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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 IRO_DISABLE (0 << 4)
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#define IRO_ENABLE (1 << 4)
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#define ASO_DISABLE (0 << 5)
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#define ASO_ENABLE (1 << 5)
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#define AK_DISABLE (0 << 6)
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#define AK_ENABLE (1 << 6)
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#define IRS_DISABLE (0 << 7)
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#define IRS_ENABLE (1 << 7)
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/* PS/GS_CTRL 0x01 */
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#define PS_REFT_MS (1 << 0) /* [3:0] 0.185 ms , default value is 0.37ms */
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#define PS_GAIN_1G (0 << 4)
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#define PS_GAIN_4G (1 << 4)
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#define PS_GAIN_16G (2 << 4)
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#define PS_GAIN_64G (3 << 4)
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#define PS_PRS_1T (0 << 6)
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#define PS_PRS_4T (1 << 6)
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/* ALS_CTRL 0x02 */
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#define ALS_REFT_MS (9 << 0)/* [3:0] 0.185 ms, default value is 94.85ms */
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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_PRS_1T (0 << 6)
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#define ALS_PRS_4T (1 << 6)
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/* LED_CTRL 0x03 */
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#define LED_REFT_US 0x3F /* [5:0] 2.89us , default value is 0.185ms */
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#define LED_CUR_12MA (0 << 6)
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#define LED_CUR_25MA (1 << 6)
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#define LED_CUR_50MA (2 << 6)
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#define LED_CUR_100MA (3 << 6)
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/* INT 0x04 */
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#define PS_INT_DISABLE 0xF8
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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_IR_RDY (1 << 1)
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#define STK_FLAG_OUI (1 << 2)
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#define STK_FLAG_PSINT (1 << 4)
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#define STK_FLAG_ALSINT (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 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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DBG
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("%s:reg=0x%x, reg_ctrl=0x%x, enable=%d\n",
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__func__,
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sensor->ops->ctrl_reg,
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sensor->ops->ctrl_data,
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enable);
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result = sensor_write_reg
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(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 ret = 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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ret = of_property_read_u32(np, "ps_threshold_low", &ps_val);
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if (ret)
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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, (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 = sensor_write_reg
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(client, THDL2_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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ret = of_property_read_u32(np, "ps_threshold_high", &ps_val);
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if (ret)
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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, (unsigned char)ps_val);
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if (result) {
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dev_err(&client->dev, "%s:write THDH1_PS fail\n",
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__func__);
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return result;
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}
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result = sensor_write_reg
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(client, THDH2_PS, (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",
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__func__);
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return result;
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}
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ret = of_property_read_u32(np, "ps_ctrl_gain", &ps_val);
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if (ret)
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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
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(client, PS_CTRL,
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(unsigned char)((ps_val << 4) | PS_REFT_MS));
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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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ret = of_property_read_u32(np, "ps_led_current", &ps_val);
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if (ret)
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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
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(client, LED_CTRL,
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(unsigned char)((ps_val << 6) | LED_REFT_US));
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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_CTRL);
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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_CTRL, 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 stk3410_get_ps_value(int ps)
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{
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int index = 0;
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static int val = 1;
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if (ps > ps_threshold_high) {
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index = 0;
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val = 0;
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} else if (ps < 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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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 -1;
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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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index = stk3410_get_ps_value(value);
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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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DBG("%s:%s value=0x%x\n", __func__, sensor->ops->name, value);
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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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value &= ~STK_FLAG_NF;
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result = sensor_write_reg
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(client, sensor->ops->int_status_reg,
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value);
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if (result) {
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dev_err(&client->dev, "%s:write status reg error\n",
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__func__);
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return result;
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}
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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_stk3410_ops = {
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.name = "ps_stk3410",
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.type = SENSOR_TYPE_PROXIMITY,
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.id_i2c = PROXIMITY_ID_STK3410,
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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_stk3410_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_stk3410_ops);
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}
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static int proximity_stk3410_remove(struct i2c_client *client)
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{
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return sensor_unregister_device(client, NULL, &psensor_stk3410_ops);
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}
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static const struct i2c_device_id proximity_stk3410_id[] = {
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{"ps_stk3410", PROXIMITY_ID_STK3410},
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{}
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};
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static struct i2c_driver proximity_stk3410_driver = {
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.probe = proximity_stk3410_probe,
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.remove = proximity_stk3410_remove,
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.shutdown = sensor_shutdown,
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.id_table = proximity_stk3410_id,
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.driver = {
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.name = "proximity_stk3410",
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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_stk3410_driver);
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MODULE_AUTHOR("Bin Yang <yangbin@rock-chips.com>");
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MODULE_DESCRIPTION("stk3410 proximity driver");
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MODULE_LICENSE("GPL");
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