drivers/input/sensors/gyro/l3g4200d.c

   1 /* drivers/input/sensors/access/kxtik.c
   2  *
   3  * Copyright (C) 2012-2015 ROCKCHIP.
   4  * Author: luowei <lw@rock-chips.com>
   5  *
   6  * This software is licensed under the terms of the GNU General Public
   7  * License version 2, as published by the Free Software Foundation, and
   8  * may be copied, distributed, and modified under those terms.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16 #include <linux/interrupt.h>
  17 #include <linux/i2c.h>
  18 #include <linux/slab.h>
  19 #include <linux/irq.h>
  20 #include <linux/miscdevice.h>
  21 #include <linux/gpio.h>
  22 #include <asm/uaccess.h>
  23 #include <asm/atomic.h>
  24 #include <linux/delay.h>
  25 #include <linux/input.h>
  26 #include <linux/workqueue.h>
  27 #include <linux/freezer.h>
  28 #include <linux/of_gpio.h>
  29 #ifdef CONFIG_HAS_EARLYSUSPEND
  30 #include <linux/earlysuspend.h>
  31 #endif
  32 #include <linux/l3g4200d.h>
  33 #include <linux/sensor-dev.h>
  34
  35
  36 #define L3G4200D_ENABLE                 0x08
  37
  38 /****************operate according to sensor chip:start************/
  39
  40 static int sensor_active(struct i2c_client *client, int enable, int rate)
  41 {
  42         struct sensor_private_data *sensor =
  43             (struct sensor_private_data *) i2c_get_clientdata(client);
  44         int result = 0;
  45         int status = 0;
  46
  47         sensor->ops->ctrl_data = sensor_read_reg(client, sensor->ops->ctrl_reg);
  48
  49         //register setting according to chip datasheet
  50         if(enable)
  51         {
  52                 status = L3G4200D_ENABLE;       //l3g4200d
  53                 sensor->ops->ctrl_data |= status;
  54         }
  55         else
  56         {
  57                 status = ~L3G4200D_ENABLE;      //l3g4200d
  58                 sensor->ops->ctrl_data &= status;
  59         }
  60
  61         DBG("%s:reg=0x%x,reg_ctrl=0x%x,enable=%d\n",__func__,sensor->ops->ctrl_reg, sensor->ops->ctrl_data, enable);
  62         result = sensor_write_reg(client, sensor->ops->ctrl_reg, sensor->ops->ctrl_data);
  63         if(result)
  64                 printk("%s:fail to active sensor\n",__func__);
  65
  66         return result;
  67
  68 }
  69
  70 static int sensor_init(struct i2c_client *client)
  71 {
  72         struct sensor_private_data *sensor =
  73             (struct sensor_private_data *) i2c_get_clientdata(client);
  74         int result = 0;
  75         unsigned char buf[5];
  76         unsigned char data = 0;
  77         int i = 0;
  78
  79         result = sensor->ops->active(client,0,0);
  80         if(result)
  81         {
  82                 printk("%s:line=%d,error\n",__func__,__LINE__);
  83                 return result;
  84         }
  85
  86         sensor->status_cur = SENSOR_OFF;
  87
  88         buf[0] = 0x07;  //27
  89         buf[1] = 0x00;
  90         buf[2] = 0x00;
  91         buf[3] = 0x20;  //0x00
  92         buf[4] = 0x00;
  93         for(i=0; i<5; i++)
  94         {
  95                 result = sensor_write_reg(client, sensor->ops->ctrl_reg+i, buf[i]);
  96                 if(result)
  97                 {
  98                         printk("%s:line=%d,error\n",__func__,__LINE__);
  99                         return result;
 100                 }
 101         }
 102
 103         result = sensor_read_reg(client, sensor->ops->ctrl_reg);
 104         if (result >= 0)
 105                 data = result & 0x000F;
 106
 107         sensor->ops->ctrl_data = data + ODR100_BW12_5;
 108         result = sensor_write_reg(client, sensor->ops->ctrl_reg, sensor->ops->ctrl_data);
 109         if(result)
 110         {
 111                 printk("%s:line=%d,error\n",__func__,__LINE__);
 112                 return result;
 113         }
 114
 115         return result;
 116 }
 117
 118
 119 static int gyro_report_value(struct i2c_client *client, struct sensor_axis *axis)
 120 {
 121         struct sensor_private_data *sensor =
 122                 (struct sensor_private_data *) i2c_get_clientdata(client);
 123
 124         /* Report GYRO  information */
 125         input_report_rel(sensor->input_dev, ABS_RX, axis->x);
 126         input_report_rel(sensor->input_dev, ABS_RY, axis->y);
 127         input_report_rel(sensor->input_dev, ABS_RZ, axis->z);
 128         input_sync(sensor->input_dev);
 129         DBG("gyro x==%d  y==%d z==%d\n",axis->x,axis->y,axis->z);
 130
 131         return 0;
 132 }
 133
 134 static int sensor_report_value(struct i2c_client *client)
 135 {
 136         struct sensor_private_data *sensor =
 137                 (struct sensor_private_data *) i2c_get_clientdata(client);
 138         struct sensor_platform_data *pdata = sensor->pdata;
 139         int ret = 0;
 140         int x = 0, y = 0, z = 0;
 141         struct sensor_axis axis;
 142         char buffer[6] = {0};
 143         int i = 0;
 144         int value = 0;
 145
 146         if(sensor->ops->read_len < 6)   //sensor->ops->read_len = 6
 147         {
 148                 printk("%s:lenth is error,len=%d\n",__func__,sensor->ops->read_len);
 149                 return -1;
 150         }
 151
 152         memset(buffer, 0, 6);
 153 #if 0
 154         /* Data bytes from hardware xL, xH, yL, yH, zL, zH */
 155         do {
 156                 buffer[0] = sensor->ops->read_reg;
 157                 ret = sensor_rx_data(client, buffer, sensor->ops->read_len);
 158                 if (ret < 0)
 159                 return ret;
 160         } while (0);
 161 #else
 162
 163         for(i=0; i<6; i++)
 164         {
 165                 //buffer[i] = sensor->ops->read_reg + i;
 166                 buffer[i] = sensor_read_reg(client, sensor->ops->read_reg + i);
 167         }
 168 #endif
 169         x = (short) (((buffer[1]) << 8) | buffer[0]);
 170         y = (short) (((buffer[3]) << 8) | buffer[2]);
 171         z = (short) (((buffer[5]) << 8) | buffer[4]);
 172
 173         DBG("%s: x=%d  y=%d z=%d \n",__func__, x,y,z);
 174         if(pdata && pdata->orientation)
 175         {
 176                 axis.x = (pdata->orientation[0])*x + (pdata->orientation[1])*y + (pdata->orientation[2])*z;
 177                 axis.y = (pdata->orientation[3])*x + (pdata->orientation[4])*y + (pdata->orientation[5])*z;
 178                 axis.z = (pdata->orientation[6])*x + (pdata->orientation[7])*y + (pdata->orientation[8])*z;
 179         }
 180         else
 181         {
 182                 axis.x = x;
 183                 axis.y = y;
 184                 axis.z = z;
 185         }
 186
 187         //filter gyro data
 188         if((abs(axis.x) > pdata->x_min)||(abs(axis.y) > pdata->y_min)||(abs(axis.z) > pdata->z_min))
 189         {
 190                 gyro_report_value(client, &axis);
 191
 192                  /* »¥³âµØ»º´æÊý¾Ý. */
 193                 mutex_lock(&(sensor->data_mutex) );
 194                 sensor->axis = axis;
 195                 mutex_unlock(&(sensor->data_mutex) );
 196         }
 197
 198         if((sensor->pdata->irq_enable)&& (sensor->ops->int_status_reg >= 0))    //read sensor intterupt status register
 199         {
 200
 201                 value = sensor_read_reg(client, sensor->ops->int_status_reg);
 202                 DBG("%s:sensor int status :0x%x\n",__func__,value);
 203         }
 204
 205         return ret;
 206 }
 207
 208
 209 struct sensor_operate gyro_l3g4200d_ops = {
 210         .name                           = "l3g4200d",
 211         .type                           = SENSOR_TYPE_GYROSCOPE,//sensor type and it should be correct
 212         .id_i2c                         = GYRO_ID_L3G4200D,             //i2c id number
 213         .read_reg                       = GYRO_DATA_REG,                //read data
 214         .read_len                       = 6,                            //data length
 215         .id_reg                         = GYRO_WHO_AM_I,                //read device id from this register
 216         .id_data                        = GYRO_DEVID_L3G4200D,          //device id
 217         .precision                      = 8,                            //8 bits
 218         .ctrl_reg                       = GYRO_CTRL_REG1,               //enable or disable
 219         .int_status_reg                 = GYRO_INT_SRC,                 //intterupt status register,if no exist then -1
 220         .range                          = {-32768,32768},               //range
 221         .trig                           = IRQF_TRIGGER_LOW|IRQF_ONESHOT,
 222         .active                         = sensor_active,
 223         .init                           = sensor_init,
 224         .report                         = sensor_report_value,
 225 };
 226
 227 /****************operate according to sensor chip:end************/
 228
 229 //function name should not be changed
 230 static struct sensor_operate *gyro_get_ops(void)
 231 {
 232         return &gyro_l3g4200d_ops;
 233 }
 234
 235
 236 static int __init gyro_l3g4200d_init(void)
 237 {
 238         struct sensor_operate *ops = gyro_get_ops();
 239         int result = 0;
 240         int type = ops->type;
 241         result = sensor_register_slave(type, NULL, NULL, gyro_get_ops);
 242         return result;
 243 }
 244
 245 static void __exit gyro_l3g4200d_exit(void)
 246 {
 247         struct sensor_operate *ops = gyro_get_ops();
 248         int type = ops->type;
 249         sensor_unregister_slave(type, NULL, NULL, gyro_get_ops);
 250 }
 251
 252
 253 module_init(gyro_l3g4200d_init);
 254 module_exit(gyro_l3g4200d_exit);
 255
 256