/* drivers/input/sensors/lsensor/cm3218.c
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*
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* Copyright (C) 2012-2016 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 <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 LENSFACTOR 1000
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/* SMBus ARA Address */
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#define CM3218_ADDR_ARA 0x0C
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/* CM3218 CMD Registers */
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#define CM3218_REG_ADDR_CMD 0x00
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#define CM3218_CMD_ALS_SD 0x0001
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#define CM3218_CMD_ALS_INT_EN 0x0002
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#define CM3218_CMD_ALS_INT_DISABLE 0x0000
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#define CM3218_CMD_ALS_IT_SHIFT 6
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#define CM3218_CMD_ALS_IT_MASK (3 << CM3218_CMD_ALS_IT_SHIFT)
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#define CM3218_CMD_ALS_IT_05T (0 << CM3218_CMD_ALS_IT_SHIFT)
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#define CM3218_CMD_ALS_IT_1T (1 << CM3218_CMD_ALS_IT_SHIFT)
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#define CM3218_CMD_ALS_IT_2T (2 << CM3218_CMD_ALS_IT_SHIFT)
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#define CM3218_CMD_ALS_IT_4T (3 << CM3218_CMD_ALS_IT_SHIFT)
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#define CM3218_DEFAULT_CMD (CM3218_CMD_ALS_IT_1T)
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#define CM3218_ALS_PERS 0x0020
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#define CM3218_REG_ADDR_ALS_WH 0x01
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#define CM3218_DEFAULT_ALS_WH 0x000C
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#define CM3218_REG_ADDR_ALS_WL 0x02
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#define CM3218_DEFAULT_ALS_WL 0x000A
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#define CM3218_REG_ADDR_ALS 0x04
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#define CM3218_REG_ADDR_STATUS 0x06
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#define CM3218_REG_ADDR_ID 0x07
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/* Software parameters */
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#define CM3218_MAX_CACHE_REGS (0x03 + 1) /* Reg.0x00 to 0x03 */
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static int als_code = 20;
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static int change_sensitivity = 50;
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static int if_sensor_init;
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static int cm3218_read_ara(struct i2c_client *client)
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{
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int status;
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unsigned short addr;
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addr = client->addr;
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client->addr = CM3218_ADDR_ARA;
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status = i2c_smbus_read_byte(client);
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client->addr = addr;
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if (status < 0)
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return -ENODEV;
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return 0;
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}
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static int cm3218_write(struct i2c_client *client, u8 reg, u16 value)
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{
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u16 regval;
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int ret;
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dev_dbg(&client->dev,
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"Write to device register 0x%02X with 0x%04X\n", reg, value);
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regval = cpu_to_le16(value);
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ret = i2c_smbus_write_word_data(client, reg, regval);
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if (ret)
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dev_err(&client->dev, "Write to device fails: 0x%x\n", ret);
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return ret;
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}
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static int cm3218_read(struct i2c_client *client, u8 reg)
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{
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int regval;
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int status;
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status = i2c_smbus_read_word_data(client, reg);
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if (status < 0) {
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dev_err(&client->dev,
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"Error in reading Reg.0x%02X\n", reg);
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return status;
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}
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regval = le16_to_cpu(status);
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dev_dbg(&client->dev,
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"Read from device register 0x%02X = 0x%04X\n",
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reg, regval);
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return regval;
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}
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static int clear_interrupt(struct i2c_client *client)
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{
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int status = 0;
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status = cm3218_read(client, CM3218_REG_ADDR_STATUS);
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if (status < 0) {
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dev_err(&client->dev, "CM3218: clean interrupt flag fail\n");
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return status;
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}
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return status;
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}
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static int enable_interrupt(struct i2c_client *client)
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{
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int status = 0;
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status = cm3218_write(
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client,
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CM3218_REG_ADDR_CMD,
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CM3218_DEFAULT_CMD |
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CM3218_CMD_ALS_INT_EN |
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CM3218_ALS_PERS);
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if (status < 0) {
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dev_err(&client->dev, "CM3128 enable interrut fails\n");
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return status;
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}
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return status;
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}
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static int disable_interrupt(struct i2c_client *client)
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{
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int status = 0;
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status = cm3218_write(
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client,
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CM3218_REG_ADDR_CMD,
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CM3218_DEFAULT_CMD |
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CM3218_CMD_ALS_INT_DISABLE);
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if (status < 0) {
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dev_err(&client->dev, "CM3218: disable interrput fail\n");
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return status;
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}
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return status;
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}
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static int set_als_int_threshold(struct i2c_client *client)
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{
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int threshold_high, threshold_low;
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int status = 0;
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/* Set ALS high threshold */
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threshold_high = als_code * (100 + change_sensitivity) / 100;
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if (threshold_high > 65535)
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threshold_high = 65535;
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status = cm3218_write(client, CM3218_REG_ADDR_ALS_WH, threshold_high);
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if (status < 0) {
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dev_err(&client->dev, "Init CM3218 CMD fails, set als wh error\n");
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return status;
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}
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/* Set ALS low threshold */
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threshold_low = als_code * (100 - change_sensitivity) / 100;
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status = cm3218_write(client, CM3218_REG_ADDR_ALS_WL, threshold_low);
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if (status < 0) {
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dev_err(&client->dev, "Init CM3218 CMD fails, set als wh error\n");
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return status;
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}
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return status;
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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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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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if (if_sensor_init)
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return 0;
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sensor->client->addr = sensor->ops->ctrl_reg;
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sensor->ops->ctrl_data = cm3218_read(client, sensor->client->addr);
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/* register setting according to chip datasheet */
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if (!enable) {
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status = CM3218_CMD_ALS_SD; /* cm3218 */
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sensor->ops->ctrl_data |= status;
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} else {
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status = ~CM3218_CMD_ALS_SD; /* cm3218 */
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sensor->ops->ctrl_data &= status;
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}
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DBG("%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 = cm3218_write(
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client,
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sensor->client->addr,
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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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int status, i;
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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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if (if_sensor_init)
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return 0;
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for (i = 0; i < 5; i++) {
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status = cm3218_write(
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client, CM3218_REG_ADDR_CMD,
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CM3218_CMD_ALS_SD);
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if (status >= 0)
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break;
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cm3218_read_ara(client);
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}
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status = cm3218_write(client, CM3218_REG_ADDR_CMD, CM3218_DEFAULT_CMD);
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if (status < 0) {
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dev_err(&client->dev, "Init CM3218 CMD fails\n");
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return status;
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}
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if (sensor->pdata->irq_enable) {
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set_als_int_threshold(client);
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enable_interrupt(client);
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}
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if_sensor_init = 1;
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msleep(250);
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return status;
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}
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static int light_report_value(struct input_dev *input, int data)
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{
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unsigned char index = 0;
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if (data <= 700) {
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index = 0;
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} else if (data <= 1400) {
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index = 1;
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} else if (data <= 2800) {
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index = 2;
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} else if (data <= 5600) {
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index = 3;
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} else if (data <= 11200) {
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index = 4;
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} else if (data <= 22400) {
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index = 5;
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} else if (data <= 44800) {
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index = 6;
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} else {
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index = 7;
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}
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input_report_abs(input, ABS_MISC, index);
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input_sync(input);
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return index;
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}
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static int cm3218_read_lux(struct i2c_client *client, int *lux)
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{
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int lux_data;
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lux_data = cm3218_read(client, CM3218_REG_ADDR_ALS);
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if (lux_data < 0) {
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dev_err(&client->dev, "Error in reading Lux DATA\n");
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return lux_data;
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}
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dev_vdbg(&client->dev, "lux = %u\n", lux_data);
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if (lux_data < 0)
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return lux_data;
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*lux = lux_data * LENSFACTOR;
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*lux /= 1000;
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return 0;
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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 index = 0;
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/* clean interrupt flag and disable it during reading data */
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if (sensor->pdata->irq_enable) {
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clear_interrupt(client);
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disable_interrupt(client);
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}
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cm3218_read_lux(client, &result);
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als_code = result;
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index = light_report_value(sensor->input_dev, 200 * result);
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/* enable interrupt after read data */
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if (sensor->pdata->irq_enable) {
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set_als_int_threshold(client);
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enable_interrupt(client);
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}
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return 0;
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}
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static struct sensor_operate light_cm3218_ops = {
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.name = "cm3218",
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/* sensor type and it should be correct */
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.type = SENSOR_TYPE_LIGHT,
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/* i2c id number */
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.id_i2c = LIGHT_ID_CM3218,
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/* read data */
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.read_reg = CM3218_REG_ADDR_ALS,
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.read_len = 2, /* data length */
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/* read device id from this register */
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.id_reg = SENSOR_UNKNOW_DATA,
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/* device id */
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.id_data = SENSOR_UNKNOW_DATA,
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.precision = 16, /* 8 bits */
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/* enable or disable */
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.ctrl_reg = CM3218_REG_ADDR_CMD,
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/* intterupt status register */
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.int_status_reg = CM3218_REG_ADDR_STATUS,
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/* range */
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.range = {0, 65535},
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/* brightness */
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.brightness = {10, 255},
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.trig = SENSOR_UNKNOW_DATA,
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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_cm3218_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_cm3218_ops);
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}
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static int light_cm3218_remove(struct i2c_client *client)
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{
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return sensor_unregister_device(client, NULL, &light_cm3218_ops);
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}
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static const struct i2c_device_id light_cm3218_id[] = {
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{"light_cm3218", LIGHT_ID_CM3218},
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{}
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};
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static struct i2c_driver light_cm3218_driver = {
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.probe = light_cm3218_probe,
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.remove = light_cm3218_remove,
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.shutdown = sensor_shutdown,
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.id_table = light_cm3218_id,
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.driver = {
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.name = "light_cm3218",
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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_cm3218_driver);
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MODULE_AUTHOR("luowei <lw@rock-chips.com>");
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MODULE_DESCRIPTION("cm3218 light driver");
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MODULE_LICENSE("GPL");
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