drivers/input/sensors/accel/mma7660.c

   1 /* drivers/input/sensors/access/mma7660.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/sensor-dev.h>
  33
  34
  35 #define MMA7660_ENABLE          1
  36
  37 #define MMA7660_REG_X_OUT       0x0
  38 #define MMA7660_REG_Y_OUT       0x1
  39 #define MMA7660_REG_Z_OUT       0x2
  40 #define MMA7660_REG_TILT        0x3
  41 #define MMA7660_REG_SRST        0x4
  42 #define MMA7660_REG_SPCNT       0x5
  43 #define MMA7660_REG_INTSU       0x6
  44 #define MMA7660_REG_MODE        0x7
  45 #define MMA7660_REG_SR          0x8
  46 #define MMA7660_REG_PDET        0x9
  47 #define MMA7660_REG_PD          0xa
  48
  49
  50 #define MMA7660_RANGE                   1500000
  51
  52 /* LIS3DH */
  53 #define MMA7660_PRECISION       6
  54 #define MMA7660_BOUNDARY                (0x1 << (MMA7660_PRECISION - 1))
  55 #define MMA7660_GRAVITY_STEP            (MMA7660_RANGE / MMA7660_BOUNDARY)
  56
  57 #define MMA7660_COUNT_AVERAGE   2
  58
  59 struct sensor_axis_average {
  60                 int x_average;
  61                 int y_average;
  62                 int z_average;
  63                 int count;
  64 };
  65
  66 static struct sensor_axis_average axis_average;
  67
  68 /****************operate according to sensor chip:start************/
  69
  70 static int sensor_active(struct i2c_client *client, int enable, int rate)
  71 {
  72         struct sensor_private_data *sensor =
  73             (struct sensor_private_data *) i2c_get_clientdata(client);
  74         int result = 0;
  75         int status = 0;
  76
  77         sensor->ops->ctrl_data = sensor_read_reg(client, sensor->ops->ctrl_reg);
  78
  79         //register setting according to chip datasheet
  80         if(enable)
  81         {
  82                 status = MMA7660_ENABLE;        //mma7660
  83                 sensor->ops->ctrl_data |= status;
  84         }
  85         else
  86         {
  87                 status = ~MMA7660_ENABLE;       //mma7660
  88                 sensor->ops->ctrl_data &= status;
  89         }
  90
  91         DBG("%s:reg=0x%x,reg_ctrl=0x%x,enable=%d\n",__func__,sensor->ops->ctrl_reg, sensor->ops->ctrl_data, enable);
  92         result = sensor_write_reg(client, sensor->ops->ctrl_reg, sensor->ops->ctrl_data);
  93         if(result)
  94                 printk("%s:fail to active sensor\n",__func__);
  95
  96         return result;
  97
  98 }
  99
 100 static int sensor_init(struct i2c_client *client)
 101 {
 102         struct sensor_private_data *sensor =
 103             (struct sensor_private_data *) i2c_get_clientdata(client);
 104         int result = 0;
 105
 106         result = sensor->ops->active(client,0,0);
 107         if(result)
 108         {
 109                 printk("%s:line=%d,error\n",__func__,__LINE__);
 110                 return result;
 111         }
 112
 113         sensor->status_cur = SENSOR_OFF;
 114
 115         DBG("%s:MMA7660_REG_TILT=0x%x\n",__func__,sensor_read_reg(client, MMA7660_REG_TILT));
 116
 117         result = sensor_write_reg(client, MMA7660_REG_SR, (0x01<<5)| 0x02);     //32 Samples/Second Active and Auto-Sleep Mode
 118         if(result)
 119         {
 120                 printk("%s:line=%d,error\n",__func__,__LINE__);
 121                 return result;
 122         }
 123
 124         if(sensor->pdata->irq_enable)   //open interrupt
 125         {
 126                 result = sensor_write_reg(client, MMA7660_REG_INTSU, 1<<4);//enable int,GINT=1
 127                 if(result)
 128                 {
 129                         printk("%s:line=%d,error\n",__func__,__LINE__);
 130                         return result;
 131                 }
 132         }
 133
 134         sensor->ops->ctrl_data = 1<<6;  //Interrupt output INT is push-pull
 135         result = sensor_write_reg(client, sensor->ops->ctrl_reg, sensor->ops->ctrl_data);
 136         if(result)
 137         {
 138                 printk("%s:line=%d,error\n",__func__,__LINE__);
 139                 return result;
 140         }
 141
 142
 143         memset(&axis_average, 0, sizeof(struct sensor_axis_average));
 144
 145         return result;
 146 }
 147
 148
 149 static int sensor_convert_data(struct i2c_client *client, char high_byte, char low_byte)
 150 {
 151     s64 result;
 152         //struct sensor_private_data *sensor =
 153         //    (struct sensor_private_data *) i2c_get_clientdata(client);
 154         //int precision = sensor->ops->precision;
 155
 156         result = (int)low_byte;
 157         if (result < MMA7660_BOUNDARY)
 158                 result = result* MMA7660_GRAVITY_STEP;
 159         else
 160                 result = ~( ((~result & (0x7fff>>(16-MMA7660_PRECISION)) ) + 1)
 161                                 * MMA7660_GRAVITY_STEP) + 1;
 162
 163         return (int)result;
 164 }
 165
 166 static int gsensor_report_value(struct i2c_client *client, struct sensor_axis *axis)
 167 {
 168         struct sensor_private_data *sensor =
 169             (struct sensor_private_data *) i2c_get_clientdata(client);
 170
 171         /* Report acceleration sensor information */
 172         input_report_abs(sensor->input_dev, ABS_X, axis->x);
 173         input_report_abs(sensor->input_dev, ABS_Y, axis->y);
 174         input_report_abs(sensor->input_dev, ABS_Z, axis->z);
 175         input_sync(sensor->input_dev);
 176         DBG("Gsensor x==%d  y==%d z==%d\n",axis->x,axis->y,axis->z);
 177
 178         return 0;
 179 }
 180
 181 #define GSENSOR_MIN             2
 182 static int sensor_report_value(struct i2c_client *client)
 183 {
 184         struct sensor_private_data *sensor =
 185                 (struct sensor_private_data *) i2c_get_clientdata(client);
 186         struct sensor_platform_data *pdata = sensor->pdata;
 187         int ret = 0;
 188         int x,y,z;
 189         struct sensor_axis axis;
 190         char buffer[3] = {0};
 191         char value = 0;
 192
 193         if(sensor->ops->read_len < 3)   //sensor->ops->read_len = 3
 194         {
 195                 printk("%s:lenth is error,len=%d\n",__func__,sensor->ops->read_len);
 196                 return -1;
 197         }
 198
 199         memset(buffer, 0, 3);
 200
 201         /* Data bytes from hardware xL, xH, yL, yH, zL, zH */
 202         do {
 203                 *buffer = sensor->ops->read_reg;
 204                 ret = sensor_rx_data(client, buffer, sensor->ops->read_len);
 205                 if (ret < 0)
 206                 return ret;
 207         } while (0);
 208
 209
 210         //this gsensor need 6 bytes buffer
 211         x = sensor_convert_data(sensor->client, 0, buffer[0]);  //buffer[1]:high bit
 212         y = sensor_convert_data(sensor->client, 0, buffer[1]);
 213         z = sensor_convert_data(sensor->client, 0, buffer[2]);
 214
 215         axis.x = (pdata->orientation[0])*x + (pdata->orientation[1])*y + (pdata->orientation[2])*z;
 216         axis.y = (pdata->orientation[3])*x + (pdata->orientation[4])*y + (pdata->orientation[5])*z;
 217         axis.z = (pdata->orientation[6])*x + (pdata->orientation[7])*y + (pdata->orientation[8])*z;
 218
 219
 220         axis_average.x_average += axis.x;
 221         axis_average.y_average += axis.y;
 222         axis_average.z_average += axis.z;
 223         axis_average.count++;
 224
 225         if(axis_average.count >= MMA7660_COUNT_AVERAGE)
 226         {
 227                 axis.x = axis_average.x_average / axis_average.count;
 228                 axis.y = axis_average.y_average / axis_average.count;
 229                 axis.z = axis_average.z_average / axis_average.count;
 230
 231                 DBG( "%s: axis = %d  %d  %d \n", __func__, axis.x, axis.y, axis.z);
 232
 233                 memset(&axis_average, 0, sizeof(struct sensor_axis_average));
 234
 235                 //Report event only while value is changed to save some power
 236                 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))
 237                 {
 238                         gsensor_report_value(client, &axis);
 239
 240                         /* »¥³âµØ»º´æÊý¾Ý. */
 241                         mutex_lock(&(sensor->data_mutex) );
 242                         sensor->axis = axis;
 243                         mutex_unlock(&(sensor->data_mutex) );
 244                 }
 245         }
 246
 247         if((sensor->pdata->irq_enable)&& (sensor->ops->int_status_reg >= 0))    //read sensor intterupt status register
 248         {
 249
 250                 value = sensor_read_reg(client, sensor->ops->int_status_reg);
 251                 DBG("%s:sensor int status :0x%x\n",__func__,value);
 252         }
 253
 254         return ret;
 255 }
 256
 257
 258 struct sensor_operate gsensor_mma7660_ops = {
 259         .name                           = "mma7660",
 260         .type                           = SENSOR_TYPE_ACCEL,                    //sensor type and it should be correct
 261         .id_i2c                         = ACCEL_ID_MMA7660,                     //i2c id number
 262         .read_reg                       = MMA7660_REG_X_OUT,                    //read data
 263         .read_len                       = 3,                                    //data length
 264         .id_reg                         = SENSOR_UNKNOW_DATA,                   //read device id from this register
 265         .id_data                        = SENSOR_UNKNOW_DATA,                   //device id
 266         .precision                      = MMA7660_PRECISION,                    //12 bit
 267         .ctrl_reg                       = MMA7660_REG_MODE,                     //enable or disable
 268         .int_status_reg                 = SENSOR_UNKNOW_DATA,                   //intterupt status register
 269         .range                          = {-MMA7660_RANGE,MMA7660_RANGE},       //range
 270         .trig                           = IRQF_TRIGGER_LOW|IRQF_ONESHOT,
 271         .active                         = sensor_active,
 272         .init                           = sensor_init,
 273         .report                         = sensor_report_value,
 274 };
 275
 276 /****************operate according to sensor chip:end************/
 277
 278 //function name should not be changed
 279 static struct sensor_operate *gsensor_get_ops(void)
 280 {
 281         return &gsensor_mma7660_ops;
 282 }
 283
 284
 285 static int __init gsensor_mma7660_init(void)
 286 {
 287         struct sensor_operate *ops = gsensor_get_ops();
 288         int result = 0;
 289         int type = ops->type;
 290         result = sensor_register_slave(type, NULL, NULL, gsensor_get_ops);
 291         return result;
 292 }
 293
 294 static void __exit gsensor_mma7660_exit(void)
 295 {
 296         struct sensor_operate *ops = gsensor_get_ops();
 297         int type = ops->type;
 298         sensor_unregister_slave(type, NULL, NULL, gsensor_get_ops);
 299 }
 300
 301
 302 module_init(gsensor_mma7660_init);
 303 module_exit(gsensor_mma7660_exit);
 304
 305
 306