drivers/input/sensors/accel/lsm303d.c

   1 /* drivers/input/sensors/access/kxtik.c
   2  *
   3  * Copyright (C) 2012-2015 ROCKCHIP.
   4  * Author: Bruins <xwj@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
  17 #include <linux/interrupt.h>
  18 #include <linux/i2c.h>
  19 #include <linux/slab.h>
  20 #include <linux/irq.h>
  21 #include <linux/miscdevice.h>
  22 #include <linux/gpio.h>
  23 #include <asm/uaccess.h>
  24 #include <asm/atomic.h>
  25 #include <linux/delay.h>
  26 #include <linux/input.h>
  27 #include <linux/workqueue.h>
  28 #include <linux/freezer.h>
  29 #include <linux/of_gpio.h>
  30 #ifdef CONFIG_HAS_EARLYSUSPEND
  31 #include <linux/earlysuspend.h>
  32 #endif
  33 #include <linux/sensor-dev.h>
  34
  35
  36 #define LSM303D_WHO_AM_I                (0x0F)
  37
  38 /* full scale setting - register & mask */
  39 #define LSM303D_CTRL_REG0               (0x1F)
  40 #define LSM303D_CTRL_REG1               (0x20)
  41 #define LSM303D_CTRL_REG2               (0x21)
  42 #define LSM303D_CTRL_REG3               (0x22)
  43 #define LSM303D_CTRL_REG4               (0x23)
  44 #define LSM303D_CTRL_REG5               (0x24)
  45 #define LSM303D_CTRL_REG6               (0x25)
  46 #define LSM303D_CTRL_REG7               (0x26)
  47 #define LSM303D_STATUS_REG              (0x27)
  48 #define LSM303D_OUT_X_L                 (0x28)
  49 #define LSM303D_OUT_X_H                 (0x29)
  50 #define LSM303D_OUT_Y_L                 (0x2a)
  51 #define LSM303D_OUT_Y_H                 (0x2b)
  52 #define LSM303D_OUT_Z_L                 (0x2c)
  53 #define LSM303D_OUT_Z_H                 (0x2d)
  54 #define LSM303D_FIFO_CTRL_REG           (0x2E)
  55 #define LSM303D_FIFO_SRC_REG            (0X2F)
  56
  57 #define LSM303D_IG_CFG1                 (0x30)
  58 #define LSM303D_IG_SRC1                 (0x31)
  59 #define LSM303D_IG_THS1                 (0x32)
  60 #define LSM303D_IG_DURATION1            (0x33)
  61
  62 #define LSM303D_IG_CFG2                 (0x34)
  63 #define LSM303D_IG_SRC2                 (0x35)
  64 #define LSM303D_IG_THS2                 (0x36)
  65 #define LSM303D_IG_DURATION2            (0x37)
  66
  67
  68 #define LSM303D_DEVID                   (0x49)  //chip id
  69 #define LSM303D_ACC_DISABLE             (0x08)
  70
  71 #define LSM303D_RANGE                   2000000
  72
  73 /* LSM303D */
  74 #define LSM303D_PRECISION               16
  75 #define LSM303D_BOUNDARY                        (0x1 << (LSM303D_PRECISION - 1))
  76 #define LSM303D_GRAVITY_STEP            (LSM303D_RANGE / LSM303D_BOUNDARY)
  77
  78 #define ODR3P25                         0x10  /* 3.25Hz output data rate */
  79 #define ODR6P25                         0x20  /* 6.25Hz output data rate */
  80 #define ODR12P5                         0x30  /* 12.5Hz output data rate */
  81 #define ODR25                           0x40  /* 25Hz output data rate */
  82 #define ODR50                           0x50  /* 50Hz output data rate */
  83 #define ODR100                          0x60  /* 100Hz output data rate */
  84 #define ODR200                          0x70  /* 200Hz output data rate */
  85 #define ODR400                          0x80  /* 400Hz output data rate */
  86 #define ODR800                          0x90  /* 800Hz output data rate */
  87 #define ODR1600                         0xA0  /* 1600Hz output data rate */
  88
  89
  90 struct sensor_reg_data {
  91         char reg;
  92         char data;
  93 };
  94
  95 /****************operate according to sensor chip:start************/
  96 static int sensor_active(struct i2c_client *client, int enable, int rate)
  97 {
  98         struct sensor_private_data *sensor =
  99             (struct sensor_private_data *) i2c_get_clientdata(client);
 100         int result = 0;
 101         int status = 0;
 102
 103         sensor->ops->ctrl_data = sensor_read_reg(client, sensor->ops->ctrl_reg);
 104
 105         sensor->ops->ctrl_data |= ODR100;       //100HZ,if 0 then power down
 106
 107         //register setting according to chip datasheet
 108         if(!enable)
 109         {
 110                 status = LSM303D_ACC_DISABLE;   //lis3dh
 111                 sensor->ops->ctrl_data |= status;
 112         }
 113         else
 114         {
 115                 status = ~LSM303D_ACC_DISABLE;  //lis3dh
 116                 sensor->ops->ctrl_data &= status;
 117         }
 118
 119         DBG("%s:reg=0x%x,reg_ctrl=0x%x,enable=%d\n",__func__,sensor->ops->ctrl_reg, sensor->ops->ctrl_data, enable);
 120         result = sensor_write_reg(client, sensor->ops->ctrl_reg, sensor->ops->ctrl_data);
 121         if(result)
 122                 printk("%s:fail to active sensor\n",__func__);
 123
 124         return result;
 125
 126 }
 127
 128
 129 static int sensor_init(struct i2c_client *client)
 130 {
 131         struct sensor_private_data *sensor =
 132             (struct sensor_private_data *) i2c_get_clientdata(client);
 133         int result = 0;
 134         int i;
 135
 136         struct sensor_reg_data reg_data[] =
 137         {
 138                 {LSM303D_CTRL_REG0,0x00},
 139                 {LSM303D_CTRL_REG1,0x07},
 140                 {LSM303D_CTRL_REG2,0x00},
 141                 {LSM303D_CTRL_REG3,0x00},
 142                 {LSM303D_CTRL_REG4,0x00},
 143                 {LSM303D_CTRL_REG5,0x78},               //High resolution output mode:11,
 144                 {LSM303D_CTRL_REG6,0x20},
 145                 {LSM303D_CTRL_REG7,0x00},
 146                 {LSM303D_FIFO_CTRL_REG,0x00},
 147                 {LSM303D_IG_CFG1,0xFF},         //6 direction position recognition
 148                 {LSM303D_IG_THS1,0x7F},         //Interrupt 1 threshold
 149                 {LSM303D_IG_DURATION1,0x7F},    //Duration value 0x00->ox7f
 150
 151         /*
 152                 {LSM303D_CTRL_REG7,0x00},
 153                 {LSM303D_CTRL_REG4,0x08},               //High resolution output mode: 1, Normal mode
 154                 {LSM303D_CTRL_REG6,0x40},
 155
 156                 {LSM303D_FIFO_CTRL_REG,0x00},   //
 157                 {LSM303D_IG_CFG1,0xFF},                 //6 direction position recognition
 158                 {LSM303D_IG_THS1,0x7F},                 //Interrupt 1 threshold
 159                 {LSM303D_IG_DURATION1,0x7F},    //Duration value 0x00->ox7f
 160                 */
 161         };
 162
 163         result = sensor->ops->active(client,0,0);
 164         if(result)
 165         {
 166                 printk("%s:line=%d,error\n",__func__,__LINE__);
 167                 return result;
 168         }
 169
 170         sensor->status_cur = SENSOR_OFF;
 171
 172         for(i=0;i<(sizeof(reg_data)/sizeof(struct sensor_reg_data));i++)
 173         {
 174                 result = sensor_write_reg(client, reg_data[i].reg, reg_data[i].data);
 175                 if(result)
 176                 {
 177                         printk("%s:line=%d,i=%d,error\n",__func__,__LINE__,i);
 178                         return result;
 179                 }
 180         }
 181
 182
 183         if(sensor->pdata->irq_enable)
 184         {
 185
 186                 result = sensor_write_reg(client, LSM303D_CTRL_REG3, 0x20);
 187                 if(result)
 188                 {
 189                         printk("%s:line=%d,error\n",__func__,__LINE__);
 190                         return result;
 191                 }
 192
 193                 i = sensor_read_reg(client,LSM303D_CTRL_REG5);
 194
 195                 result = sensor_write_reg(client, LSM303D_CTRL_REG5, (i|0x01));
 196                 if(result)
 197                 {
 198                         printk("%s:line=%d,error\n",__func__,__LINE__);
 199                         return result;
 200                 }
 201
 202         }
 203
 204         return result;
 205 }
 206
 207
 208 static int sensor_convert_data(struct i2c_client *client, char high_byte, char low_byte)
 209 {
 210         s64 result;
 211         struct sensor_private_data *sensor =
 212             (struct sensor_private_data *) i2c_get_clientdata(client);
 213
 214         switch (sensor->devid) {
 215                 case LSM303D_DEVID:
 216                         result = ((int)high_byte << 8) | (int)low_byte;
 217                         if (result < LSM303D_BOUNDARY)
 218                         result = result* LSM303D_GRAVITY_STEP;
 219                 else
 220                         result = ~( ((~result & (0x7fff>>(16-LSM303D_PRECISION)) ) + 1)
 221                                                 * LSM303D_GRAVITY_STEP) + 1;
 222                         break;
 223
 224                 default:
 225                         printk(KERN_ERR "%s: devid wasn't set correctly\n",__func__);
 226                         return -EFAULT;
 227     }
 228
 229     return (int)result;
 230 }
 231
 232 static int gsensor_report_value(struct i2c_client *client, struct sensor_axis *axis)
 233 {
 234         struct sensor_private_data *sensor =
 235                 (struct sensor_private_data *) i2c_get_clientdata(client);
 236
 237         /* Report acceleration sensor information */
 238         input_report_abs(sensor->input_dev, ABS_X, axis->x);
 239         input_report_abs(sensor->input_dev, ABS_Y, axis->y);
 240         input_report_abs(sensor->input_dev, ABS_Z, axis->z);
 241         input_sync(sensor->input_dev);
 242         DBG("Gsensor x==%d  y==%d z==%d\n",axis->x,axis->y,axis->z);
 243
 244         return 0;
 245 }
 246
 247 #define GSENSOR_MIN  10
 248 static int sensor_report_value(struct i2c_client *client)
 249 {
 250         struct sensor_private_data *sensor =
 251                         (struct sensor_private_data *) i2c_get_clientdata(client);
 252         struct sensor_platform_data *pdata = sensor->pdata;
 253         int ret = 0;
 254         int x,y,z;
 255         struct sensor_axis axis;
 256         char buffer[6] = {0};
 257         char value = 0;
 258
 259         if(sensor->ops->read_len < 6)   //sensor->ops->read_len = 6
 260         {
 261                 printk("%s:lenth is error,len=%d\n",__func__,sensor->ops->read_len);
 262                 return -1;
 263         }
 264
 265         memset(buffer, 0, 6);
 266
 267         value = sensor_read_reg(client, LSM303D_STATUS_REG);
 268         if((value & 0x0f) == 0)
 269         {
 270                 printk("%s:line=%d,value=0x%x,data is not ready\n",__func__,__LINE__,value);
 271                 return -1;
 272         }
 273
 274
 275         /* Data bytes from hardware xL, xH, yL, yH, zL, zH */
 276         do {
 277                 *buffer = sensor->ops->read_reg;
 278                 ret = sensor_rx_data(client, buffer, sensor->ops->read_len);
 279                 if (ret < 0)
 280                 return ret;
 281         } while (0);
 282
 283         //this gsensor need 6 bytes buffer
 284         x = sensor_convert_data(sensor->client, buffer[1], buffer[0]);  //buffer[1]:high bit
 285         y = sensor_convert_data(sensor->client, buffer[3], buffer[2]);
 286         z = sensor_convert_data(sensor->client, buffer[5], buffer[4]);
 287
 288         axis.x = (pdata->orientation[0])*x + (pdata->orientation[1])*y + (pdata->orientation[2])*z;
 289         axis.y = (pdata->orientation[3])*x + (pdata->orientation[4])*y + (pdata->orientation[5])*z;
 290         axis.z = (pdata->orientation[6])*x + (pdata->orientation[7])*y + (pdata->orientation[8])*z;
 291
 292         DBG( "%s: axis = %d  %d  %d \n", __func__, axis.x, axis.y, axis.z);
 293         //printk( "%s: axis = %d  %d  %d \n", __func__, axis.x, axis.y, axis.z);
 294
 295         //Report event  only while value is changed to save some power
 296         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))
 297         {
 298                 gsensor_report_value(client, &axis);
 299
 300                 /* »¥³âµØ»º´æÊý¾Ý. */
 301                 mutex_lock(&(sensor->data_mutex) );
 302                 sensor->axis = axis;
 303                 mutex_unlock(&(sensor->data_mutex) );
 304         }
 305
 306         if((sensor->pdata->irq_enable)&& (sensor->ops->int_status_reg >= 0))    //read sensor intterupt status register
 307         {
 308
 309                 value = sensor_read_reg(client, sensor->ops->int_status_reg);
 310                 DBG("%s:sensor int status :0x%x\n",__func__,value);
 311         }
 312
 313         return ret;
 314 }
 315
 316 struct sensor_operate gsensor_lsm303d_ops = {
 317         .name                           = "lsm303d",
 318         .type                           = SENSOR_TYPE_ACCEL,            //sensor type and it should be correct
 319         .id_i2c                         = ACCEL_ID_LSM303D,             //i2c id number
 320         .read_reg                       = (LSM303D_OUT_X_L | 0x80),     //read data
 321         .read_len                       = 6,                            //data length
 322         .id_reg                         = LSM303D_WHO_AM_I,             //read device id from this register
 323         .id_data                        = LSM303D_DEVID,                        //device id
 324         .precision                      = LSM303D_PRECISION,            //16 bits
 325         .ctrl_reg                       = LSM303D_CTRL_REG1,            //enable or disable
 326         .int_status_reg                 = LSM303D_IG_SRC1,              //intterupt status register
 327         .range                          = {-LSM303D_RANGE,LSM303D_RANGE},       //range
 328         .trig                           = (IRQF_TRIGGER_LOW|IRQF_ONESHOT),
 329         .active                         = sensor_active,
 330         .init                           = sensor_init,
 331         .report                         = sensor_report_value,
 332 };
 333
 334
 335 /****************operate according to sensor chip:end************/
 336
 337 //function name should not be changed
 338 static struct sensor_operate *gsensor_get_ops(void)
 339 {
 340         return &gsensor_lsm303d_ops;
 341 }
 342
 343
 344 static int __init gsensor_lis3dh_init(void)
 345 {
 346         struct sensor_operate *ops = gsensor_get_ops();
 347         int result = 0;
 348         int type = ops->type;
 349         result = sensor_register_slave(type, NULL, NULL, gsensor_get_ops);
 350         return result;
 351 }
 352
 353 static void __exit gsensor_lis3dh_exit(void)
 354 {
 355         struct sensor_operate *ops = gsensor_get_ops();
 356         int type = ops->type;
 357         sensor_unregister_slave(type, NULL, NULL, gsensor_get_ops);
 358 }
 359
 360
 361 module_init(gsensor_lis3dh_init);
 362 module_exit(gsensor_lis3dh_exit);
 363
 364
 365
 366