xref: /OK3568_Linux_fs/kernel/drivers/input/sensors/accel/mma8452.c (revision 4882a59341e53eb6f0b4789bf948001014eff981)

/* drivers/input/sensors/access/mma8452.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 <linux/uaccess.h>
#include <asm/atomic.h>
#include <linux/delay.h>
#include <linux/input.h>
#include <linux/workqueue.h>
#include <linux/freezer.h>
#include <linux/of_gpio.h>
#ifdef CONFIG_HAS_EARLYSUSPEND
#include <linux/earlysuspend.h>
#endif
#include <linux/sensor-dev.h>

/* Default register settings */
#define RBUFF_SIZE		12	/* Rx buffer size */

#define MMA8452_REG_STATUS   	    	0x0 //RO
#define MMA8452_REG_X_OUT_MSB       	0x1 //RO
#define MMA8452_REG_X_OUT_LSB       	0x2 //RO
#define MMA8452_REG_Y_OUT_MSB       	0x3 //RO
#define MMA8452_REG_Y_OUT_LSB       	0x4 //RO
#define MMA8452_REG_Z_OUT_MSB       	0x5 //RO
#define MMA8452_REG_Z_OUT_LSB       	0x6 //RO
#define MMA8452_REG_F_SETUP		       	0x9 //RW

#define MMA8452_REG_SYSMOD				0xB //RO
#define MMA8452_REG_INTSRC	    		0xC //RO
#define MMA8452_REG_WHO_AM_I      		0xD //RO
#define MMA8452_REG_XYZ_DATA_CFG		0xE //RW
#define MMA8452_REG_HP_FILTER_CUTOFF	0xF //RW
#define MMA8452_REG_PL_STATUS			0x10 //RO
#define MMA8452_REG_PL_CFG				0x11 //RW
#define MMA8452_REG_PL_COUNT			0x12 //RW
#define MMA8452_REG_PL_BF_ZCOMP			0x13 //RW
#define MMA8452_REG_P_L_THS_REG			0x14 //RW
#define MMA8452_REG_FF_MT_CFG			0x15 //RW
#define MMA8452_REG_FF_MT_SRC			0x16 //RO
#define MMA8452_REG_FF_MT_THS			0x17 //RW
#define MMA8452_REG_FF_MT_COUNT			0x18 //RW
#define MMA8452_REG_TRANSIENT_CFG		0x1D //RW
#define MMA8452_REG_TRANSIENT_SRC		0x1E //RO
#define MMA8452_REG_TRANSIENT_THS		0x1F //RW
#define MMA8452_REG_TRANSIENT_COUNT		0x20 //RW
#define MMA8452_REG_PULSE_CFG			0x21 //RW
#define MMA8452_REG_PULSE_SRC			0x22 //RO
#define MMA8452_REG_PULSE_THSX			0x23 //RW
#define MMA8452_REG_PULSE_THSY			0x24 //RW
#define MMA8452_REG_PULSE_THSZ			0x25 //RW
#define MMA8452_REG_PULSE_TMLT			0x26 //RW
#define MMA8452_REG_PULSE_LTCY			0x27 //RW
#define MMA8452_REG_PULSE_WIND			0x28 //RW
#define MMA8452_REG_ASLP_COUNT			0x29 //RW
#define MMA8452_REG_CTRL_REG1			0x2A //RW
#define MMA8452_REG_CTRL_REG2			0x2B //RW
#define MMA8452_REG_CTRL_REG3			0x2C //RW
#define MMA8452_REG_CTRL_REG4			0x2D //RW
#define MMA8452_REG_CTRL_REG5			0x2E //RW
#define MMA8452_REG_OFF_X				0x2F //RW
#define MMA8452_REG_OFF_Y				0x30 //RW
#define MMA8452_REG_OFF_Z				0x31 //RW

/*rate*/
#define MMA8452_RATE_800          0
#define MMA8452_RATE_400          1
#define MMA8452_RATE_200          2
#define MMA8452_RATE_100          3
#define MMA8452_RATE_50        	  4
#define MMA8452_RATE_12P5         5
#define MMA8452_RATE_6P25         6
#define MMA8452_RATE_1P56         7
#define MMA8452_RATE_SHIFT		  3


#define MMA8452_ASLP_RATE_50          0
#define MMA8452_ASLP_RATE_12P5        1
#define MMA8452_ASLP_RATE_6P25        2
#define MMA8452_ASLP_RATE_1P56        3
#define MMA8452_ASLP_RATE_SHIFT		  6

/*Auto-adapt mma845x series*/
/*Modified by Yick @ROCKCHIP
  xieyi@rockchips.com*/
/*
  Range: unit(ug 1g=1 000 000 ug)
  		 option(2g,4g,8g)
		 G would be defined on android HAL
  Precision: bit wide of valid data
  Boundary: Max positive count
  Gravity_step: gravity value indicated by per count
 */
#define FREAD_MASK				0 /* enabled(1<<1) only if reading MSB 8bits*/
#define MMA845X_RANGE		(16384 * 2)
/* mma8451 */
#define MMA8451_PRECISION       14
#define MMA8451_BOUNDARY        (0x1 << (MMA8451_PRECISION - 1))
#define MMA8451_GRAVITY_STEP    (MMA845X_RANGE / MMA8451_BOUNDARY)

/* mma8452 */
#define MMA8452_PRECISION       12
#define MMA8452_BOUNDARY        (0x1 << (MMA8452_PRECISION - 1))
#define MMA8452_GRAVITY_STEP    (MMA845X_RANGE / MMA8452_BOUNDARY)

/* mma8453 */
#define MMA8453_PRECISION       10
#define MMA8453_BOUNDARY        (0x1 << (MMA8453_PRECISION - 1))
#define MMA8453_GRAVITY_STEP    (MMA845X_RANGE / MMA8453_BOUNDARY)

/* mma8653 */
#define MMA8653_PRECISION       10
#define MMA8653_BOUNDARY        (0x1 << (MMA8653_PRECISION - 1))
#define MMA8653_GRAVITY_STEP    (MMA845X_RANGE / MMA8653_BOUNDARY)


#define MMA8451_DEVID		0x1a
#define MMA8452_DEVID		0x2a
#define MMA8453_DEVID		0x3a
#define MMA8653_DEVID		0x5a


#define MMA8452_ENABLE		1


/****************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 = MMA8452_ENABLE;	//mma8452
		sensor->ops->ctrl_data |= status;
	}
	else
	{
		status = ~MMA8452_ENABLE;	//mma8452
		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)
{
	int tmp;
	int ret = 0;
	int i = 0;
	unsigned char id_reg = MMA8452_REG_WHO_AM_I;
	unsigned char id_data = 0;
	struct sensor_private_data *sensor =
	    (struct sensor_private_data *) i2c_get_clientdata(client);

	ret = sensor->ops->active(client,0,0);
	if(ret)
	{
		printk("%s:line=%d,error\n",__func__,__LINE__);
		return ret;
	}

	sensor->status_cur = SENSOR_OFF;

	for(i=0; i<3; i++)
	{
		ret = sensor_rx_data(client, &id_reg, 1);
		id_data = id_reg;
		if(!ret)
		break;
	}

	if(ret)
	{
		printk("%s:fail to read id,ret=%d\n",__func__, ret);
		return ret;
	}

	sensor->devid = id_data;

	/* disable FIFO  FMODE = 0*/
	ret = sensor_write_reg(client,MMA8452_REG_F_SETUP,0);
	DBG("%s: MMA8452_REG_F_SETUP:%x\n",__func__, sensor_read_reg(client,MMA8452_REG_F_SETUP));

	/* set full scale range to 2g */
	ret = sensor_write_reg(client,MMA8452_REG_XYZ_DATA_CFG,0);
	DBG("%s: MMA8452_REG_XYZ_DATA_CFG:%x\n",__func__, sensor_read_reg(client,MMA8452_REG_XYZ_DATA_CFG));

	/* set bus 8bit/14bit(FREAD = 1,FMODE = 0) ,data rate*/
	tmp = (MMA8452_RATE_12P5<< MMA8452_RATE_SHIFT) | FREAD_MASK;
	ret = sensor_write_reg(client,MMA8452_REG_CTRL_REG1,tmp);

	sensor->ops->ctrl_data = tmp;

	DBG("mma8452 MMA8452_REG_CTRL_REG1:%x\n",sensor_read_reg(client,MMA8452_REG_CTRL_REG1));

	DBG("mma8452 MMA8452_REG_SYSMOD:%x\n",sensor_read_reg(client,MMA8452_REG_SYSMOD));

	ret = sensor_write_reg(client,MMA8452_REG_CTRL_REG3,5);
	DBG("mma8452 MMA8452_REG_CTRL_REG3:%x\n",sensor_read_reg(client,MMA8452_REG_CTRL_REG3));

	ret = sensor_write_reg(client,MMA8452_REG_CTRL_REG4,1);
	DBG("mma8452 MMA8452_REG_CTRL_REG4:%x\n",sensor_read_reg(client,MMA8452_REG_CTRL_REG4));

	ret = sensor_write_reg(client,MMA8452_REG_CTRL_REG5,1);
	DBG("mma8452 MMA8452_REG_CTRL_REG5:%x\n",sensor_read_reg(client,MMA8452_REG_CTRL_REG5));

	DBG("mma8452 MMA8452_REG_SYSMOD:%x\n",sensor_read_reg(client,MMA8452_REG_SYSMOD));

	return ret;
}

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 MMA8451_DEVID:
			swap(high_byte,low_byte);
			result = ((int)high_byte << (MMA8451_PRECISION-8))
					| ((int)low_byte >> (16-MMA8451_PRECISION));
			if (result < MMA8451_BOUNDARY)
				result = result * MMA8451_GRAVITY_STEP;
			else
				result = ~(((~result & (0x7fff >> (16 - MMA8451_PRECISION))) + 1)
					* MMA8451_GRAVITY_STEP) + 1;
			break;

		case MMA8452_DEVID:
			swap(high_byte,low_byte);
			result = ((int)high_byte << (MMA8452_PRECISION-8))
					| ((int)low_byte >> (16-MMA8452_PRECISION));
			if (result < MMA8452_BOUNDARY)
				result = result * MMA8452_GRAVITY_STEP;
			else
				result = ~(((~result & (0x7fff >> (16 - MMA8452_PRECISION))) + 1)
					* MMA8452_GRAVITY_STEP) + 1;
			break;

		case MMA8453_DEVID:
			swap(high_byte,low_byte);
			result = ((int)high_byte << (MMA8453_PRECISION-8))
					| ((int)low_byte >> (16-MMA8453_PRECISION));
			if (result < MMA8453_BOUNDARY)
				result = result * MMA8453_GRAVITY_STEP;
			else
				result = ~(((~result & (0x7fff >> (16 - MMA8453_PRECISION))) + 1)
					* MMA8453_GRAVITY_STEP) + 1;
			break;

		case MMA8653_DEVID:
			swap(high_byte,low_byte);
			result = ((int)high_byte << (MMA8653_PRECISION-8))
					| ((int)low_byte >> (16-MMA8653_PRECISION));
			if (result < MMA8653_BOUNDARY)
				result = result * MMA8653_GRAVITY_STEP;
			else
				result = ~(((~result & (0x7fff >> (16 - MMA8653_PRECISION))) + 1)
					* MMA8653_GRAVITY_STEP) + 1;
			break;

		default:
			printk(KERN_ERR "%s: devid wasn't set correctly\n",__func__);
			return -EFAULT;
    }

    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);

	if (sensor->status_cur == SENSOR_ON) {
		/* 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);
	}

	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);

	/* 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, 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;

	gsensor_report_value(client, &axis);

	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 gsensor_mma8452_ops = {
	.name			= "mma8452",
	.type			= SENSOR_TYPE_ACCEL,
	.id_i2c			= ACCEL_ID_MMA845X,
	.read_reg			= MMA8452_REG_X_OUT_MSB,
	.read_len			= 6,
	.id_reg			= SENSOR_UNKNOW_DATA,
	.id_data			= SENSOR_UNKNOW_DATA,
	.precision			= MMA8452_PRECISION,
	.ctrl_reg			= MMA8452_REG_CTRL_REG1,
	.int_status_reg	= MMA8452_REG_INTSRC,
	.range			= {-MMA845X_RANGE, MMA845X_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 gsensor_mma8452_probe(struct i2c_client *client,
				const struct i2c_device_id *devid)
{
	return sensor_register_device(client, NULL, devid, &gsensor_mma8452_ops);
}

static int gsensor_mma8452_remove(struct i2c_client *client)
{
	return sensor_unregister_device(client, NULL, &gsensor_mma8452_ops);
}

static const struct i2c_device_id gsensor_mma8452_id[] = {
	{"gs_mma8452", ACCEL_ID_MMA845X},
	{}
};

static struct i2c_driver gsensor_mma8452_driver = {
	.probe = gsensor_mma8452_probe,
	.remove = gsensor_mma8452_remove,
	.shutdown = sensor_shutdown,
	.id_table = gsensor_mma8452_id,
	.driver = {
		.name = "gsensor_mma8452",
	#ifdef CONFIG_PM
		.pm = &sensor_pm_ops,
	#endif
	},
};

module_i2c_driver(gsensor_mma8452_driver);

MODULE_AUTHOR("luowei <lw@rock-chips.com>");
MODULE_DESCRIPTION("mma8452 3-Axis accelerometer driver");
MODULE_LICENSE("GPL");