/* drivers/input/sensors/access/mxc6225.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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#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 MXC6225_ENABLE 1
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#define MXC6225_REG_DATA 0x00
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#define MXC6225_REG_TILT 0x3
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#define MXC6225_REG_SRST 0x4
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#define MXC6225_REG_SPCNT 0x5
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#define MXC6225_REG_INTSU 0x6
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#define MXC6225_REG_MODE 0x7
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#define MXC6225_REG_SR 0x8
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#define MXC6225_REG_PDET 0x9
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#define MXC6225_REG_PD 0xa
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#define MXC6225_RANGE 2000000//1500000
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/* LIS3DH */
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#define MXC6225_PRECISION 8 // 8bit data
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#define MXC6225_BOUNDARY (0x1 << (MXC6225_PRECISION - 1))
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#define MXC6225_GRAVITY_STEP 15625 // (MXC6225_RANGE / MXC6225_BOUNDARY)
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#define MXC6225_COUNT_AVERAGE 2
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struct sensor_axis_average {
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int x_average;
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int y_average;
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int z_average;
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int count;
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};
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static struct sensor_axis_average axis_average;
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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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sensor->ops->ctrl_data = sensor_read_reg(client, sensor->ops->ctrl_reg);
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//register setting according to chip datasheet
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if(enable)
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{
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status = MXC6225_ENABLE; //mxc6225
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sensor->ops->ctrl_data |= status;
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}
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else
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{
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status = ~MXC6225_ENABLE; //mxc6225
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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",__func__,sensor->ops->ctrl_reg, sensor->ops->ctrl_data, enable);
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result = sensor_write_reg(client, sensor->ops->ctrl_reg, sensor->ops->ctrl_data);
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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 = 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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//DBG("%s:MXC6225_REG_TILT=0x%x\n",__func__,sensor_read_reg(client, MXC6225_REG_TILT));
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result = sensor_write_reg(client, MXC6225_REG_SR, (0x01<<5)| 0x02); //32 Samples/Second Active and Auto-Sleep Mode
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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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if(sensor->pdata->irq_enable) //open interrupt
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{
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result = sensor_write_reg(client, MXC6225_REG_INTSU, 1<<4);//enable int,GINT=1
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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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}
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sensor->ops->ctrl_data = 1<<8; //Interrupt output INT is push-pull
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result = sensor_write_reg(client, sensor->ops->ctrl_reg, sensor->ops->ctrl_data);
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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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memset(&axis_average, 0, sizeof(struct sensor_axis_average));
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return result;
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}
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static int sensor_convert_data(struct i2c_client *client, char high_byte, char low_byte)
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{
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s64 result;
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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 precision = sensor->ops->precision;
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result = (int)low_byte;
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result *= 256;
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return (int)result;
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}
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static int gsensor_report_value(struct i2c_client *client, struct sensor_axis *axis)
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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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if (sensor->status_cur == SENSOR_ON) {
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/* Report acceleration sensor information */
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input_report_abs(sensor->input_dev, ABS_X, axis->x);
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input_report_abs(sensor->input_dev, ABS_Y, axis->y);
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input_report_abs(sensor->input_dev, ABS_Z, axis->z);
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input_sync(sensor->input_dev);
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}
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return 0;
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}
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#define GSENSOR_MIN 2
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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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struct sensor_platform_data *pdata = sensor->pdata;
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int ret = 0;
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int x,y,z;
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struct sensor_axis axis;
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char buffer[3] = {0};
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char value = 0;
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if(sensor->ops->read_len < 3) //sensor->ops->read_len = 3
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{
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printk("%s:lenth is error,len=%d\n",__func__,sensor->ops->read_len);
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return -1;
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}
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memset(buffer, 0, 3);
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/* Data bytes from hardware xL, xH, yL, yH, zL, zH */
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do {
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*buffer = sensor->ops->read_reg;
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ret = sensor_rx_data(client, buffer, sensor->ops->read_len);
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if (ret < 0)
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return ret;
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} while (0);
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//this gsensor need 6 bytes buffer
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x = sensor_convert_data(sensor->client, 0, buffer[0]); //buffer[1]:high bit
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y = sensor_convert_data(sensor->client, 0, buffer[1]);
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z = sensor_convert_data(sensor->client, 0, buffer[2]);
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axis.x = (pdata->orientation[0])*x + (pdata->orientation[1])*y + (pdata->orientation[2])*z;
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axis.y = (pdata->orientation[3])*x + (pdata->orientation[4])*y + (pdata->orientation[5])*z;
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axis.z = (pdata->orientation[6])*x + (pdata->orientation[7])*y + (pdata->orientation[8])*z;
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gsensor_report_value(client, &axis);
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mutex_lock(&sensor->data_mutex);
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sensor->axis = axis;
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mutex_unlock(&sensor->data_mutex);
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if((sensor->pdata->irq_enable)&& (sensor->ops->int_status_reg >= 0)) //read sensor intterupt status register
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{
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value = sensor_read_reg(client, sensor->ops->int_status_reg);
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DBG("%s:sensor int status :0x%x\n",__func__,value);
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}
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return ret;
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}
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static struct sensor_operate gsensor_mxc6225_ops = {
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.name = "mxc6225",
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.type = SENSOR_TYPE_ACCEL,
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.id_i2c = ACCEL_ID_MXC6225,
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.read_reg = MXC6225_REG_DATA,
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.read_len = 3,
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.id_reg = SENSOR_UNKNOW_DATA,
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.id_data = SENSOR_UNKNOW_DATA,
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.precision = MXC6225_PRECISION,
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.ctrl_reg = MXC6225_REG_MODE,
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.int_status_reg = SENSOR_UNKNOW_DATA,
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.range = {-32768, 32768},
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.trig = IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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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 gsensor_mxc6225_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, &gsensor_mxc6225_ops);
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}
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static int gsensor_mxc6225_remove(struct i2c_client *client)
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{
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return sensor_unregister_device(client, NULL, &gsensor_mxc6225_ops);
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}
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static const struct i2c_device_id gsensor_mxc6225_id[] = {
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{"gs_mxc6225", ACCEL_ID_MXC6225},
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{}
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};
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static struct i2c_driver gsensor_mxc6225_driver = {
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.probe = gsensor_mxc6225_probe,
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.remove = gsensor_mxc6225_remove,
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.shutdown = sensor_shutdown,
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.id_table = gsensor_mxc6225_id,
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.driver = {
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.name = "gsensor_mxc6225",
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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(gsensor_mxc6225_driver);
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MODULE_AUTHOR("luowei <lw@rock-chips.com>");
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MODULE_DESCRIPTION("mxc6225 3-Axis accelerometer driver");
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MODULE_LICENSE("GPL");
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