/* drivers/input/sensors/access/kxtik.c * * Copyright (C) 2012-2015 ROCKCHIP. * Author: luowei * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_HAS_EARLYSUSPEND #include #endif #include #define LIS3DH_INT_COUNT (0x0E) #define LIS3DH_WHO_AM_I (0x0F) /* full scale setting - register & mask */ #define LIS3DH_TEMP_CFG_REG (0x1F) #define LIS3DH_CTRL_REG1 (0x20) #define LIS3DH_CTRL_REG2 (0x21) #define LIS3DH_CTRL_REG3 (0x22) #define LIS3DH_CTRL_REG4 (0x23) #define LIS3DH_CTRL_REG5 (0x24) #define LIS3DH_CTRL_REG6 (0x25) #define LIS3DH_REFERENCE (0x26) #define LIS3DH_STATUS_REG (0x27) #define LIS3DH_OUT_X_L (0x28) #define LIS3DH_OUT_X_H (0x29) #define LIS3DH_OUT_Y_L (0x2a) #define LIS3DH_OUT_Y_H (0x2b) #define LIS3DH_OUT_Z_L (0x2c) #define LIS3DH_OUT_Z_H (0x2d) #define LIS3DH_FIFO_CTRL_REG (0x2E) #define LIS3DH_INT1_CFG (0x30) #define LIS3DH_INT1_SRC (0x31) #define LIS3DH_INT1_THS (0x32) #define LIS3DH_INT1_DURATION (0x33) #define LIS3DH_DEVID (0x33) //chip id #define LIS3DH_ACC_DISABLE (0x08) #define LIS3DH_RANGE 2000000 /* LIS3DH */ #define LIS3DH_PRECISION 16 #define LIS3DH_BOUNDARY (0x1 << (LIS3DH_PRECISION - 1)) #define LIS3DH_GRAVITY_STEP (LIS3DH_RANGE / LIS3DH_BOUNDARY) #define ODR1 0x10 /* 1Hz output data rate */ #define ODR10 0x20 /* 10Hz output data rate */ #define ODR25 0x30 /* 25Hz output data rate */ #define ODR50 0x40 /* 50Hz output data rate */ #define ODR100 0x50 /* 100Hz output data rate */ #define ODR200 0x60 /* 200Hz output data rate */ #define ODR400 0x70 /* 400Hz output data rate */ #define ODR1250 0x90 /* 1250Hz output data rate */ struct sensor_reg_data { char reg; char data; }; /****************operate according to sensor chip:start************/ static int sensor_active(struct i2c_client *client, int enable, int rate) { struct sensor_private_data *sensor = (struct sensor_private_data *) i2c_get_clientdata(client); int result = 0; int status = 0; sensor->ops->ctrl_data = sensor_read_reg(client, sensor->ops->ctrl_reg); sensor->ops->ctrl_data |= ODR100; //100HZ,if 0 then power down //register setting according to chip datasheet if(!enable) { status = LIS3DH_ACC_DISABLE; //lis3dh sensor->ops->ctrl_data |= status; } else { status = ~LIS3DH_ACC_DISABLE; //lis3dh sensor->ops->ctrl_data &= status; } DBG("%s:reg=0x%x,reg_ctrl=0x%x,enable=%d\n",__func__,sensor->ops->ctrl_reg, sensor->ops->ctrl_data, enable); result = sensor_write_reg(client, sensor->ops->ctrl_reg, sensor->ops->ctrl_data); if(result) printk("%s:fail to active sensor\n",__func__); return result; } static int sensor_init(struct i2c_client *client) { struct sensor_private_data *sensor = (struct sensor_private_data *) i2c_get_clientdata(client); int result = 0; int i; struct sensor_reg_data reg_data[] = { {LIS3DH_CTRL_REG2,0X00}, {LIS3DH_CTRL_REG4,0x08}, //High resolution output mode: 1, Normal mode {LIS3DH_CTRL_REG6,0x40}, {LIS3DH_TEMP_CFG_REG,0x00}, // {LIS3DH_FIFO_CTRL_REG,0x00}, // {LIS3DH_INT1_CFG,0xFF}, //6 direction position recognition {LIS3DH_INT1_THS,0x7F}, //Interrupt 1 threshold {LIS3DH_INT1_DURATION,0x7F}, //Duration value 0x00->ox7f }; result = sensor->ops->active(client,0,0); if(result) { printk("%s:line=%d,error\n",__func__,__LINE__); return result; } sensor->status_cur = SENSOR_OFF; for(i=0;i<(sizeof(reg_data)/sizeof(struct sensor_reg_data));i++) { result = sensor_write_reg(client, reg_data[i].reg, reg_data[i].data); if(result) { printk("%s:line=%d,i=%d,error\n",__func__,__LINE__,i); return result; } } if(sensor->pdata->irq_enable) { result = sensor_write_reg(client, LIS3DH_CTRL_REG3, 0x40);//I1_AOI1 =1 if motion if(result) { printk("%s:line=%d,error\n",__func__,__LINE__); return result; } result = sensor_write_reg(client, LIS3DH_CTRL_REG5, 0x08); if(result) { printk("%s:line=%d,error\n",__func__,__LINE__); return result; } } return result; } static int sensor_convert_data(struct i2c_client *client, char high_byte, char low_byte) { s64 result; struct sensor_private_data *sensor = (struct sensor_private_data *) i2c_get_clientdata(client); /* int precision = sensor->ops->precision; */ switch (sensor->devid) { case LIS3DH_DEVID: result = ((int)high_byte << 8) | (int)low_byte; if (result < LIS3DH_BOUNDARY) result = result * LIS3DH_GRAVITY_STEP; else result = ~(((~result & (0x7fff >> (16 - LIS3DH_PRECISION))) + 1) * LIS3DH_GRAVITY_STEP) + 1; break; default: printk(KERN_ERR "%s: devid wasn't set correctly\n",__func__); return -EFAULT; } return (int)result; } static int angle_report_value(struct i2c_client *client, struct sensor_axis *axis) { struct sensor_private_data *sensor = (struct sensor_private_data *) i2c_get_clientdata(client); /* Report acceleration sensor information */ input_report_abs(sensor->input_dev, ABS_X, axis->x); input_report_abs(sensor->input_dev, ABS_Y, axis->y); input_report_abs(sensor->input_dev, ABS_Z, axis->z); input_sync(sensor->input_dev); DBG("Gsensor x==%d y==%d z==%d\n",axis->x,axis->y,axis->z); return 0; } #define GSENSOR_MIN 10 static int sensor_report_value(struct i2c_client *client) { struct sensor_private_data *sensor = (struct sensor_private_data *) i2c_get_clientdata(client); struct sensor_platform_data *pdata = sensor->pdata; int ret = 0; int x,y,z; struct sensor_axis axis; char buffer[6] = {0}; char value = 0; if(sensor->ops->read_len < 6) //sensor->ops->read_len = 6 { printk("%s:lenth is error,len=%d\n",__func__,sensor->ops->read_len); return -1; } memset(buffer, 0, 6); value = sensor_read_reg(client, LIS3DH_STATUS_REG); if((value & 0x0f) == 0) { printk("%s:line=%d,value=0x%x,data is not ready\n",__func__,__LINE__,value); return -1; } /* Data bytes from hardware xL, xH, yL, yH, zL, zH */ do { *buffer = sensor->ops->read_reg; ret = sensor_rx_data(client, buffer, sensor->ops->read_len); if (ret < 0) return ret; } while (0); //this angle need 6 bytes buffer x = sensor_convert_data(sensor->client, buffer[1], buffer[0]); //buffer[1]:high bit y = sensor_convert_data(sensor->client, buffer[3], buffer[2]); z = sensor_convert_data(sensor->client, buffer[5], buffer[4]); axis.x = (pdata->orientation[0])*x + (pdata->orientation[1])*y + (pdata->orientation[2])*z; axis.y = (pdata->orientation[3])*x + (pdata->orientation[4])*y + (pdata->orientation[5])*z; axis.z = (pdata->orientation[6])*x + (pdata->orientation[7])*y + (pdata->orientation[8])*z; DBG( "%s: axis = %d %d %d \n", __func__, axis.x, axis.y, axis.z); //Report event only while value is changed to save some power if((abs(sensor->axis.x - axis.x) > GSENSOR_MIN) || (abs(sensor->axis.y - axis.y) > GSENSOR_MIN) || (abs(sensor->axis.z - axis.z) > GSENSOR_MIN)) { angle_report_value(client, &axis); /* »¥³âµØ»º´æÊý¾Ý. */ mutex_lock(&(sensor->data_mutex) ); sensor->axis = axis; mutex_unlock(&(sensor->data_mutex) ); } if((sensor->pdata->irq_enable)&& (sensor->ops->int_status_reg >= 0)) //read sensor intterupt status register { value = sensor_read_reg(client, sensor->ops->int_status_reg); DBG("%s:sensor int status :0x%x\n",__func__,value); } return ret; } static struct sensor_operate angle_lis3dh_ops = { .name = "angle_lis3dh", .type = SENSOR_TYPE_ANGLE, //sensor type and it should be correct .id_i2c = ANGLE_ID_LIS3DH, //i2c id number .read_reg = (LIS3DH_OUT_X_L | 0x80), //read data .read_len = 6, //data length .id_reg = LIS3DH_WHO_AM_I, //read device id from this register .id_data = LIS3DH_DEVID, //device id .precision = LIS3DH_PRECISION, //12 bits .ctrl_reg = LIS3DH_CTRL_REG1, //enable or disable .int_status_reg = LIS3DH_INT1_SRC, //intterupt status register .range = {-LIS3DH_RANGE,LIS3DH_RANGE}, //range .trig = (IRQF_TRIGGER_LOW|IRQF_ONESHOT), .active = sensor_active, .init = sensor_init, .report = sensor_report_value, }; /****************operate according to sensor chip:end************/ static int angle_lis3dh_probe(struct i2c_client *client, const struct i2c_device_id *devid) { return sensor_register_device(client, NULL, devid, &angle_lis3dh_ops); } static int angle_lis3dh_remove(struct i2c_client *client) { return sensor_unregister_device(client, NULL, &angle_lis3dh_ops); } static const struct i2c_device_id angle_lis3dh_id[] = { {"angle_lis3dh", ANGLE_ID_LIS3DH}, {} }; static struct i2c_driver angle_lis3dh_driver = { .probe = angle_lis3dh_probe, .remove = angle_lis3dh_remove, .shutdown = sensor_shutdown, .id_table = angle_lis3dh_id, .driver = { .name = "angle_lis3dh", #ifdef CONFIG_PM .pm = &sensor_pm_ops, #endif }, }; module_i2c_driver(angle_lis3dh_driver); MODULE_AUTHOR("luowei "); MODULE_DESCRIPTION("lis3dh angle driver"); MODULE_LICENSE("GPL");