/* drivers/input/sensors/access/mpu6880_acc.c
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*
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* Copyright (C) 2012-2015 ROCKCHIP.
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* Author: oeh<oeh@rock-chips.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/irq.h>
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#include <linux/miscdevice.h>
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#include <linux/gpio.h>
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#include <linux/uaccess.h>
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#include <asm/atomic.h>
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#include <linux/delay.h>
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#include <linux/input.h>
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#include <linux/workqueue.h>
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#include <linux/freezer.h>
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#include <linux/of_gpio.h>
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#ifdef CONFIG_HAS_EARLYSUSPEND
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#include <linux/earlysuspend.h>
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#endif
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#include <linux/sensor-dev.h>
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#include <linux/mpu6880.h>
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static int mpu6880_set_lpf(struct i2c_client *client, int rate)
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{
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const short hz[] = {184, 98, 41, 20, 10, 5};
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const int d[] = {DLPF_CFG_184HZ, DLPF_CFG_98HZ,
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DLPF_CFG_41HZ, DLPF_CFG_20HZ,
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DLPF_CFG_10HZ, DLPF_CFG_5HZ};
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int i, h, data, result;
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h = (rate >> 1);
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i = 0;
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while ((h < hz[i]) && (i < ARRAY_SIZE(d) - 1))
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i++;
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data = d[i];
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result = sensor_write_reg(client, MPU6880_CONFIG, data);
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if (result)
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return -1;
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return 0;
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}
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static int mpu6880_set_rate(struct i2c_client *client, int rate)
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{
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u8 data;
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int result;
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u16 fifo_rate;
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/* always use poll mode, no need to set rate */
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return 0;
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if ((rate < 1) || (rate > 250))
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return -1;
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data = rate - 1;
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result = sensor_write_reg(client, MPU6880_SMPLRT_DIV, data);
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if (result)
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return result;
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fifo_rate = 1000 / rate;
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result = mpu6880_set_lpf(client, fifo_rate);
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if (result)
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return -1;
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return 0;
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}
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static int sensor_active(struct i2c_client *client, int enable, int rate)
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{
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struct sensor_private_data *sensor =
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(struct sensor_private_data *) i2c_get_clientdata(client);
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int result = 0;
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int status = 0;
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u8 pwrm1 = 0;
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sensor->ops->ctrl_data = sensor_read_reg(client, sensor->ops->ctrl_reg);
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pwrm1 = sensor_read_reg(client, MPU6880_PWR_MGMT_1);
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if (!enable) {
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status = BIT_ACCEL_STBY;
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sensor->ops->ctrl_data |= status;
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if ((sensor->ops->ctrl_data & BIT_GYRO_STBY) == BIT_GYRO_STBY) {
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pwrm1 |= MPU6880_PWRM1_SLEEP;
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}
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} else {
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status = ~BIT_ACCEL_STBY;
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sensor->ops->ctrl_data &= status;
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pwrm1 &= ~MPU6880_PWRM1_SLEEP;
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mpu6880_set_rate(client, rate);
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}
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result = sensor_write_reg(client, sensor->ops->ctrl_reg, sensor->ops->ctrl_data);
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if (result) {
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dev_err(&client->dev, "%s:fail to set pwrm2\n", __func__);
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return -1;
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}
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msleep(20);
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result = sensor_write_reg(client, MPU6880_PWR_MGMT_1, pwrm1);
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if (result) {
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dev_err(&client->dev, "%s:fail to set pwrm1\n", __func__);
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return -1;
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}
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msleep(50);
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return result;
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}
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static int sensor_init(struct i2c_client *client)
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{
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int res = 0;
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u8 read_data = 0;
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struct sensor_private_data *sensor =
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(struct sensor_private_data *) i2c_get_clientdata(client);
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read_data = sensor_read_reg(client, sensor->ops->id_reg);
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if (read_data != sensor->ops->id_data) {
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dev_err(&client->dev, "%s:check id err,read_data:%d,ops->id_data:%d\n", __func__, read_data, sensor->ops->id_data);
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return -1;
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}
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res = sensor_write_reg(client, MPU6880_PWR_MGMT_1, 0x80);
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if (res) {
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dev_err(&client->dev, "set MPU6880_PWR_MGMT_1 error,res: %d!\n", res);
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return res;
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}
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msleep(40);
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res = sensor_write_reg(client, MPU6880_GYRO_CONFIG, 0x18);
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if (res) {
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dev_err(&client->dev, "set MPU6880_GYRO_CONFIG error,res: %d!\n", res);
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return res;
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}
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msleep(10);
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res = sensor_write_reg(client, MPU6880_ACCEL_CONFIG, 0x00);
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if (res) {
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dev_err(&client->dev, "set MPU6880_ACCEL_CONFIG error,res: %d!\n", res);
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return res;
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}
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msleep(10);
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res = sensor_write_reg(client, MPU6880_ACCEL_CONFIG2, 0x00);
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if (res) {
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dev_err(&client->dev, "set MPU6880_ACCEL_CONFIG2 error,res: %d!\n", res);
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return res;
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}
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res = sensor_write_reg(client, MPU6880_PWR_MGMT_2, 0x3F);
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if (res) {
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dev_err(&client->dev, "set MPU6880_PWR_MGMT_2 error,res: %d!\n", res);
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return res;
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}
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msleep(10);
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res = sensor_write_reg(client, MPU6880_PWR_MGMT_1, 0x41);
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if (res) {
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dev_err(&client->dev, "set MPU6880_PWR_MGMT_1 error,res: %d!\n", res);
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return res;
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}
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msleep(10);
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res = sensor->ops->active(client, 0, sensor->pdata->poll_delay_ms);
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if (res) {
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dev_err(&client->dev, "%s:line=%d,error\n", __func__, __LINE__);
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return res;
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}
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return res;
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}
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static int gsensor_report_value(struct i2c_client *client, struct sensor_axis *axis)
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{
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struct sensor_private_data *sensor =
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(struct sensor_private_data *) i2c_get_clientdata(client);
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if (sensor->status_cur == SENSOR_ON) {
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/* Report acceleration sensor information */
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input_report_abs(sensor->input_dev, ABS_X, axis->x);
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input_report_abs(sensor->input_dev, ABS_Y, axis->y);
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input_report_abs(sensor->input_dev, ABS_Z, axis->z);
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input_sync(sensor->input_dev);
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}
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return 0;
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}
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static int sensor_report_value(struct i2c_client *client)
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{
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struct sensor_private_data *sensor =
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(struct sensor_private_data *) i2c_get_clientdata(client);
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struct sensor_platform_data *pdata = sensor->pdata;
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int ret = 0;
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short x, y, z;
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struct sensor_axis axis;
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u8 buffer[6] = {0};
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char value = 0;
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if (sensor->ops->read_len < 6) {
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dev_err(&client->dev, "%s:lenth is error,len=%d\n", __func__, sensor->ops->read_len);
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return -1;
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}
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memset(buffer, 0, 6);
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/* Data bytes from hardware xL, xH, yL, yH, zL, zH */
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do {
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*buffer = sensor->ops->read_reg;
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ret = sensor_rx_data(client, buffer, sensor->ops->read_len);
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if (ret < 0)
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return ret;
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} while (0);
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x = ((buffer[0] << 8) & 0xff00) + (buffer[1] & 0xFF);
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y = ((buffer[2] << 8) & 0xff00) + (buffer[3] & 0xFF);
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z = ((buffer[4] << 8) & 0xff00) + (buffer[5] & 0xFF);
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axis.x = (pdata->orientation[0]) * x + (pdata->orientation[1]) * y + (pdata->orientation[2]) * z;
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axis.y = (pdata->orientation[3]) * x + (pdata->orientation[4]) * y + (pdata->orientation[5]) * z;
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axis.z = (pdata->orientation[6]) * x + (pdata->orientation[7]) * y + (pdata->orientation[8]) * z;
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gsensor_report_value(client, &axis);
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mutex_lock(&(sensor->data_mutex));
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sensor->axis = axis;
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mutex_unlock(&(sensor->data_mutex));
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if ((sensor->pdata->irq_enable) && (sensor->ops->int_status_reg >= 0))
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value = sensor_read_reg(client, sensor->ops->int_status_reg);
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return ret;
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}
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static struct sensor_operate gsensor_mpu6880_ops = {
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.name = "mpu6880_acc",
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.type = SENSOR_TYPE_ACCEL,
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.id_i2c = ACCEL_ID_MPU6880,
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.read_reg = MPU6880_ACCEL_XOUT_H,
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.read_len = 6,
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.id_reg = MPU6880_WHOAMI,
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.id_data = MPU6880_DEVICE_ID,
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.precision = MPU6880_PRECISION,
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.ctrl_reg = MPU6880_PWR_MGMT_2,
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.int_status_reg = MPU6880_INT_STATUS,
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.range = {-32768, 32768},
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.trig = IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
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.active = sensor_active,
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.init = sensor_init,
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.report = sensor_report_value,
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};
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/****************operate according to sensor chip:end************/
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static int gsensor_mpu6880_probe(struct i2c_client *client,
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const struct i2c_device_id *devid)
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{
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return sensor_register_device(client, NULL, devid, &gsensor_mpu6880_ops);
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}
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static int gsensor_mpu6880_remove(struct i2c_client *client)
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{
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return sensor_unregister_device(client, NULL, &gsensor_mpu6880_ops);
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}
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static const struct i2c_device_id gsensor_mpu6880_id[] = {
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{"mpu6880_acc", ACCEL_ID_MPU6880},
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{}
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};
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static struct i2c_driver gsensor_mpu6880_driver = {
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.probe = gsensor_mpu6880_probe,
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.remove = gsensor_mpu6880_remove,
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.shutdown = sensor_shutdown,
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.id_table = gsensor_mpu6880_id,
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.driver = {
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.name = "gsensor_mpu6880",
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#ifdef CONFIG_PM
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.pm = &sensor_pm_ops,
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#endif
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},
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};
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module_i2c_driver(gsensor_mpu6880_driver);
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MODULE_AUTHOR("oeh <oeh@rock-chips.com>");
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MODULE_DESCRIPTION("mpu6880 3-Axis accelerometer driver");
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MODULE_LICENSE("GPL");
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