/* drivers/input/sensors/access/kxtik.c
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*
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* Copyright (C) 2012-2015 ROCKCHIP.
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* Author: luowei <lw@rock-chips.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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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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*/
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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 <asm/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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#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 AP3212B_NUM_CACHABLE_REGS 23
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#define AP3216C_NUM_CACHABLE_REGS 26
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#define AP3212B_RAN_COMMAND 0x10
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#define AP3212B_RAN_MASK 0x30
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#define AP3212B_RAN_SHIFT (4)
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#define AP3212B_MODE_COMMAND 0x00
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#define AP3212B_MODE_SHIFT (0)
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#define AP3212B_MODE_MASK 0x07
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#define AP3212B_INT_COMMAND 0x01
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#define AP3212B_INT_SHIFT (0)
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#define AP3212B_INT_MASK 0x03
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#define AP3212B_INT_PMASK 0x02
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#define AP3212B_INT_AMASK 0x01
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#define AL3212_ADC_LSB 0x0c
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#define AL3212_ADC_MSB 0x0d
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#define AP3212B_ALS_LTHL 0x1a
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#define AP3212B_ALS_LTHL_SHIFT (0)
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#define AP3212B_ALS_LTHL_MASK 0xff
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#define AP3212B_ALS_LTHH 0x1b
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#define AP3212B_ALS_LTHH_SHIFT (0)
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#define AP3212B_ALS_LTHH_MASK 0xff
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#define AP3212B_ALS_HTHL 0x1c
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#define AP3212B_ALS_HTHL_SHIFT (0)
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#define AP3212B_ALS_HTHL_MASK 0xff
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#define AP3212B_ALS_HTHH 0x1d
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#define AP3212B_ALS_HTHH_SHIFT (0)
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#define AP3212B_ALS_HTHH_MASK 0xff
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static u16 ap321xx_threshole[8] = {28,444,625,888,1778,3555,7222,0xffff};
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/*
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* register access helpers
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*/
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static int __ap321xx_read_reg(struct i2c_client *client,
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u32 reg, u8 mask, u8 shift)
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{
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u8 val;
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val = i2c_smbus_read_byte_data(client, reg);
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return (val & mask) >> shift;
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}
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static int __ap321xx_write_reg(struct i2c_client *client,
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u32 reg, u8 mask, u8 shift, u8 val)
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{
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int ret = 0;
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u8 tmp;
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tmp = i2c_smbus_read_byte_data(client, reg);
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tmp &= ~mask;
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tmp |= val << shift;
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ret = i2c_smbus_write_byte_data(client, reg, tmp);
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return ret;
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}
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/*
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* internally used functions
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*/
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/* range */
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static int ap321xx_set_range(struct i2c_client *client, int range)
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{
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return __ap321xx_write_reg(client, AP3212B_RAN_COMMAND,
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AP3212B_RAN_MASK, AP3212B_RAN_SHIFT, range);;
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}
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/* mode */
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static int ap321xx_get_mode(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 ret;
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ret = __ap321xx_read_reg(client, sensor->ops->ctrl_reg,
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AP3212B_MODE_MASK, AP3212B_MODE_SHIFT);
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return ret;
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}
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static int ap321xx_set_mode(struct i2c_client *client, int mode)
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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 ret;
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ret = __ap321xx_write_reg(client, sensor->ops->ctrl_reg,
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AP3212B_MODE_MASK, AP3212B_MODE_SHIFT, mode);
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return ret;
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}
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static int ap321xx_get_adc_value(struct i2c_client *client)
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{
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unsigned int lsb, msb, val;
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unsigned char index=0;
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lsb = i2c_smbus_read_byte_data(client, AL3212_ADC_LSB);
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if (lsb < 0) {
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return lsb;
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}
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msb = i2c_smbus_read_byte_data(client, AL3212_ADC_MSB);
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if (msb < 0)
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return msb;
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val = msb << 8 | lsb;
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for(index = 0; index < 7 && val > ap321xx_threshole[index];index++)
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;
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return index;
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}
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/* ALS low threshold */
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static int ap321xx_set_althres(struct i2c_client *client, int val)
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{
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int lsb, msb, err;
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msb = val >> 8;
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lsb = val & AP3212B_ALS_LTHL_MASK;
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err = __ap321xx_write_reg(client, AP3212B_ALS_LTHL,
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AP3212B_ALS_LTHL_MASK, AP3212B_ALS_LTHL_SHIFT, lsb);
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if (err)
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return err;
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err = __ap321xx_write_reg(client, AP3212B_ALS_LTHH,
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AP3212B_ALS_LTHH_MASK, AP3212B_ALS_LTHH_SHIFT, msb);
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return err;
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}
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/* ALS high threshold */
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static int ap321xx_set_ahthres(struct i2c_client *client, int val)
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{
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int lsb, msb, err;
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msb = val >> 8;
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lsb = val & AP3212B_ALS_HTHL_MASK;
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err = __ap321xx_write_reg(client, AP3212B_ALS_HTHL,
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AP3212B_ALS_HTHL_MASK, AP3212B_ALS_HTHL_SHIFT, lsb);
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if (err)
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return err;
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err = __ap321xx_write_reg(client, AP3212B_ALS_HTHH,
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AP3212B_ALS_HTHH_MASK, AP3212B_ALS_HTHH_SHIFT, msb);
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return err;
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}
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static int ap321xx_get_intstat(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 = i2c_smbus_read_byte_data(client, sensor->ops->int_status_reg);
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val &= AP3212B_INT_MASK;
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return val >> AP3212B_INT_SHIFT;
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}
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static int ap321xx_product_detect(struct i2c_client *client)
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{
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int mid = i2c_smbus_read_byte_data(client, 0x03);
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int pid = i2c_smbus_read_byte_data(client, 0x04);
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int rid = i2c_smbus_read_byte_data(client, 0x05);
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if ( mid == 0x01 && pid == 0x01 &&
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(rid == 0x03 || rid == 0x04) )
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{
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//printk("RevID [%d], ==> DA3212 v1.5~1.8 ...... AP3212B detected\n", rid);
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}
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else if ( (mid == 0x01 && pid == 0x02 && rid == 0x00) ||
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(mid == 0x02 && pid == 0x02 && rid == 0x01))
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{
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//printk("RevID [%d], ==> DA3212 v2.0 ...... AP3212C/AP3216C detected\n", rid);
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}
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else
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{
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//printk("MakeID[%d] ProductID[%d] RevID[%d] .... can't detect ... bad reversion!!!\n", mid, pid, rid);
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return -EIO;
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}
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return 0;
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}
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static int ap321xx_init_client(struct i2c_client *client)
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{
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/* set defaults */
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ap321xx_set_range(client, 0);
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ap321xx_set_mode(client, 0);
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return 0;
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}
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static int ap321xx_lsensor_enable(struct i2c_client *client)
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{
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int ret = 0,mode;
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mode = ap321xx_get_mode(client);
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if((mode & 0x01) == 0){
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mode |= 0x01;
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ret = ap321xx_set_mode(client,mode);
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}
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return ret;
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}
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static int ap321xx_lsensor_disable(struct i2c_client *client)
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{
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int ret = 0,mode;
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mode = ap321xx_get_mode(client);
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if(mode & 0x01){
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mode &= ~0x01;
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if(mode == 0x04)
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mode = 0;
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ret = ap321xx_set_mode(client,mode);
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}
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return ret;
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}
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static void ap321xx_change_ls_threshold(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 value;
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value = ap321xx_get_adc_value(client);
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DBG("ALS lux index: %u\n", value);
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if(value > 0){
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ap321xx_set_althres(client,ap321xx_threshole[value-1]);
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ap321xx_set_ahthres(client,ap321xx_threshole[value]);
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}
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else{
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ap321xx_set_althres(client,0);
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ap321xx_set_ahthres(client,ap321xx_threshole[value]);
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}
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input_report_abs(sensor->input_dev, ABS_MISC, value);
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input_sync(sensor->input_dev);
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}
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/****************operate according to sensor chip:start************/
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static int sensor_active(struct i2c_client *client, int enable, int rate)
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{
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int result = 0;
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//register setting according to chip datasheet
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if (enable){
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result = ap321xx_lsensor_enable(client);
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if(!result){
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msleep(200);
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ap321xx_change_ls_threshold(client);
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}
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}
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else
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result = ap321xx_lsensor_disable(client);
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if(result)
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printk("%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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int result = 0;
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result = ap321xx_product_detect(client);
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if (result)
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{
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dev_err(&client->dev, "ret: %d, product version detect failed.\n",result);
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return result;
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}
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/* initialize the AP3212B chip */
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result = ap321xx_init_client(client);
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if (result)
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return result;
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result = sensor->ops->active(client,0,0);
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if(result)
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{
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printk("%s:line=%d,error\n",__func__,__LINE__);
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return result;
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}
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sensor->status_cur = SENSOR_OFF;
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return result;
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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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int result = 0;
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u8 int_stat;
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int_stat = ap321xx_get_intstat(client);
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// ALS int
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if (int_stat & AP3212B_INT_AMASK)
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{
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ap321xx_change_ls_threshold(client);
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}
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return result;
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}
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static struct sensor_operate light_ap321xx_ops = {
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.name = "ls_ap321xx",
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.type = SENSOR_TYPE_LIGHT, //sensor type and it should be correct
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.id_i2c = LIGHT_ID_AP321XX, //i2c id number
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.read_reg = SENSOR_UNKNOW_DATA, //read data //there are two regs, we fix them in code.
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.read_len = 1, //data length
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.id_reg = SENSOR_UNKNOW_DATA, //read device id from this register //there are 3 regs, we fix them in code.
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.id_data = SENSOR_UNKNOW_DATA, //device id
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.precision = 16, //8 bits
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.ctrl_reg = AP3212B_MODE_COMMAND, //enable or disable
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.int_status_reg = AP3212B_INT_COMMAND, //intterupt status register
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.range = {100,65535}, //range
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.brightness ={10,255}, // brightness
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.trig = IRQF_TRIGGER_FALLING | 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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/****************operate according to sensor chip:end************/
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static int light_ap321xx_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, &light_ap321xx_ops);
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}
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static int light_ap321xx_remove(struct i2c_client *client)
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{
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return sensor_unregister_device(client, NULL, &light_ap321xx_ops);
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}
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static const struct i2c_device_id light_ap321xx_id[] = {
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{"ls_ap321xx", LIGHT_ID_AP321XX},
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{}
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};
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static struct i2c_driver light_ap321xx_driver = {
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.probe = light_ap321xx_probe,
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.remove = light_ap321xx_remove,
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.shutdown = sensor_shutdown,
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.id_table = light_ap321xx_id,
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.driver = {
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.name = "light_ap321xx",
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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(light_ap321xx_driver);
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MODULE_AUTHOR("luowei <lw@rock-chips.com>");
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MODULE_DESCRIPTION("ap321xx light driver");
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MODULE_LICENSE("GPL");
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