--- /dev/null
+/* drivers/input/sensors/access/mxc6225.c
+ *
+ * Copyright (C) 2012-2015 ROCKCHIP.
+ * Author: luowei <lw@rock-chips.com>
+ *
+ * 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 <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/irq.h>
+#include <linux/miscdevice.h>
+#include <linux/gpio.h>
+#include <asm/uaccess.h>
+#include <asm/atomic.h>
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/workqueue.h>
+#include <linux/freezer.h>
+#include <mach/gpio.h>
+#include <mach/board.h>
+#ifdef CONFIG_HAS_EARLYSUSPEND
+#include <linux/earlysuspend.h>
+#endif
+#include <linux/sensor-dev.h>
+
+#if 0
+#define SENSOR_DEBUG_TYPE SENSOR_TYPE_ACCEL
+#define DBG(x...) if(sensor->pdata->type == SENSOR_DEBUG_TYPE) printk(x)
+#else
+#define DBG(x...)
+#endif
+
+#define MXC6225_ENABLE 1
+
+#define MXC6225_REG_DATA 0x00
+#define MXC6225_REG_TILT 0x3
+#define MXC6225_REG_SRST 0x4
+#define MXC6225_REG_SPCNT 0x5
+#define MXC6225_REG_INTSU 0x6
+#define MXC6225_REG_MODE 0x7
+#define MXC6225_REG_SR 0x8
+#define MXC6225_REG_PDET 0x9
+#define MXC6225_REG_PD 0xa
+
+
+#define MXC6225_RANGE 2000000//1500000
+
+/* LIS3DH */
+#define MXC6225_PRECISION 8 // 8bit data
+#define MXC6225_BOUNDARY (0x1 << (MXC6225_PRECISION - 1))
+#define MXC6225_GRAVITY_STEP 15625 // (MXC6225_RANGE / MXC6225_BOUNDARY)
+
+#define MXC6225_COUNT_AVERAGE 2
+
+struct sensor_axis_average {
+ int x_average;
+ int y_average;
+ int z_average;
+ int count;
+};
+
+static struct sensor_axis_average axis_average;
+
+/****************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);
+
+ //register setting according to chip datasheet
+ if(enable)
+ {
+ status = MXC6225_ENABLE; //mxc6225
+ sensor->ops->ctrl_data |= status;
+ }
+ else
+ {
+ status = ~MXC6225_ENABLE; //mxc6225
+ 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;
+
+ result = sensor->ops->active(client,0,0);
+ if(result)
+ {
+ printk("%s:line=%d,error\n",__func__,__LINE__);
+ return result;
+ }
+
+ sensor->status_cur = SENSOR_OFF;
+
+ //DBG("%s:MXC6225_REG_TILT=0x%x\n",__func__,sensor_read_reg(client, MXC6225_REG_TILT));
+
+ result = sensor_write_reg(client, MXC6225_REG_SR, (0x01<<5)| 0x02); //32 Samples/Second Active and Auto-Sleep Mode
+ if(result)
+ {
+ printk("%s:line=%d,error\n",__func__,__LINE__);
+ return result;
+ }
+
+ if(sensor->pdata->irq_enable) //open interrupt
+ {
+ result = sensor_write_reg(client, MXC6225_REG_INTSU, 1<<4);//enable int,GINT=1
+ if(result)
+ {
+ printk("%s:line=%d,error\n",__func__,__LINE__);
+ return result;
+ }
+ }
+
+ sensor->ops->ctrl_data = 1<<8; //Interrupt output INT is push-pull
+ result = sensor_write_reg(client, sensor->ops->ctrl_reg, sensor->ops->ctrl_data);
+ if(result)
+ {
+ printk("%s:line=%d,error\n",__func__,__LINE__);
+ return result;
+ }
+
+
+ memset(&axis_average, 0, sizeof(struct sensor_axis_average));
+
+ 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;
+
+ result = (int)low_byte;
+ if (result < MXC6225_BOUNDARY)
+ result = result* MXC6225_GRAVITY_STEP;
+ else
+ result = ~(((~result & 0x7f) + 1) * MXC6225_GRAVITY_STEP) + 1;
+
+ return (int)result;
+}
+
+static int gsensor_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_X, 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 2
+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[3] = {0};
+ char value = 0;
+
+ if(sensor->ops->read_len < 3) //sensor->ops->read_len = 3
+ {
+ printk("%s:lenth is error,len=%d\n",__func__,sensor->ops->read_len);
+ return -1;
+ }
+
+ memset(buffer, 0, 3);
+
+ /* 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 gsensor need 6 bytes buffer
+ x = sensor_convert_data(sensor->client, 0, buffer[0]); //buffer[1]:high bit
+ y = sensor_convert_data(sensor->client, 0, buffer[1]);
+ z = sensor_convert_data(sensor->client, 0, buffer[2]);
+
+ 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;
+
+
+ axis_average.x_average += axis.x;
+ axis_average.y_average += axis.y;
+ axis_average.z_average += axis.z;
+ axis_average.count++;
+
+ if(axis_average.count >= MXC6225_COUNT_AVERAGE)
+ {
+ axis.x = axis_average.x_average / axis_average.count;
+ axis.y = axis_average.y_average / axis_average.count;
+ axis.z = axis_average.z_average / axis_average.count;
+
+ DBG( "%s: axis = %d %d %d \n", __func__, axis.x, axis.y, axis.z);
+
+ memset(&axis_average, 0, sizeof(struct sensor_axis_average));
+
+ //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))
+ {
+ gsensor_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;
+}
+
+
+struct sensor_operate gsensor_mxc6225_ops = {
+ .name = "mxc6225",
+ .type = SENSOR_TYPE_ACCEL, //sensor type and it should be correct
+ .id_i2c = ACCEL_ID_MXC6225, //i2c id number
+ .read_reg = MXC6225_REG_DATA, //read data
+ .read_len = 3, //data length
+ .id_reg = SENSOR_UNKNOW_DATA, //read device id from this register
+ .id_data = SENSOR_UNKNOW_DATA, //device id
+ .precision = MXC6225_PRECISION, //12 bit
+ .ctrl_reg = MXC6225_REG_MODE, //enable or disable
+ .int_status_reg = SENSOR_UNKNOW_DATA, //intterupt status register
+ .range = {-MXC6225_RANGE,MXC6225_RANGE}, //range
+ .trig = IRQF_TRIGGER_LOW |IRQF_ONESHOT,
+ .active = sensor_active,
+ .init = sensor_init,
+ .report = sensor_report_value,
+};
+
+/****************operate according to sensor chip:end************/
+
+//function name should not be changed
+static struct sensor_operate *gsensor_get_ops(void)
+{
+ return &gsensor_mxc6225_ops;
+}
+
+
+static int __init gsensor_mxc6225_init(void)
+{
+ struct sensor_operate *ops = gsensor_get_ops();
+ int result = 0;
+ int type = ops->type;
+
+ result = sensor_register_slave(type, NULL, NULL, gsensor_get_ops);
+ DBG("%s\n",__func__);
+ return result;
+}
+
+static void __exit gsensor_mxc6225_exit(void)
+{
+ struct sensor_operate *ops = gsensor_get_ops();
+ int type = ops->type;
+ sensor_unregister_slave(type, NULL, NULL, gsensor_get_ops);
+}
+
+
+module_init(gsensor_mxc6225_init);
+module_exit(gsensor_mxc6225_exit);
+
+
+
projects / firefly-linux-kernel-4.4.55.git / commitdiff