/* drivers/input/sensors/access/mpu6880_acc.c * * Copyright (C) 2012-2015 ROCKCHIP. * Author: oeh * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_HAS_EARLYSUSPEND #include #endif #include #include static int mpu6880_set_lpf(struct i2c_client *client, int rate) { const short hz[] = {184, 98, 41, 20, 10, 5}; const int d[] = {DLPF_CFG_184HZ, DLPF_CFG_98HZ, DLPF_CFG_41HZ, DLPF_CFG_20HZ, DLPF_CFG_10HZ, DLPF_CFG_5HZ}; int i, h, data, result; h = (rate >> 1); i = 0; while ((h < hz[i]) && (i < ARRAY_SIZE(d) - 1)) i++; data = d[i]; result = sensor_write_reg(client, MPU6880_CONFIG, data); if (result) return -1; return 0; } static int mpu6880_set_rate(struct i2c_client *client, int rate) { u8 data; int result; u16 fifo_rate; /* always use poll mode, no need to set rate */ return 0; if ((rate < 1) || (rate > 250)) return -1; data = rate - 1; result = sensor_write_reg(client, MPU6880_SMPLRT_DIV, data); if (result) return result; fifo_rate = 1000 / rate; result = mpu6880_set_lpf(client, fifo_rate); if (result) return -1; return 0; } 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; u8 pwrm1 = 0; sensor->ops->ctrl_data = sensor_read_reg(client, sensor->ops->ctrl_reg); pwrm1 = sensor_read_reg(client, MPU6880_PWR_MGMT_1); if (!enable) { status = BIT_ACCEL_STBY; sensor->ops->ctrl_data |= status; if ((sensor->ops->ctrl_data & BIT_GYRO_STBY) == BIT_GYRO_STBY) { pwrm1 |= MPU6880_PWRM1_SLEEP; } } else { status = ~BIT_ACCEL_STBY; sensor->ops->ctrl_data &= status; pwrm1 &= ~MPU6880_PWRM1_SLEEP; mpu6880_set_rate(client, rate); } result = sensor_write_reg(client, sensor->ops->ctrl_reg, sensor->ops->ctrl_data); if (result) { dev_err(&client->dev, "%s:fail to set pwrm2\n", __func__); return -1; } msleep(20); result = sensor_write_reg(client, MPU6880_PWR_MGMT_1, pwrm1); if (result) { dev_err(&client->dev, "%s:fail to set pwrm1\n", __func__); return -1; } msleep(50); return result; } static int sensor_init(struct i2c_client *client) { int res = 0; u8 read_data = 0; struct sensor_private_data *sensor = (struct sensor_private_data *) i2c_get_clientdata(client); read_data = sensor_read_reg(client, sensor->ops->id_reg); if (read_data != sensor->ops->id_data) { dev_err(&client->dev, "%s:check id err,read_data:%d,ops->id_data:%d\n", __func__, read_data, sensor->ops->id_data); return -1; } res = sensor_write_reg(client, MPU6880_PWR_MGMT_1, 0x80); if (res) { dev_err(&client->dev, "set MPU6880_PWR_MGMT_1 error,res: %d!\n", res); return res; } msleep(40); res = sensor_write_reg(client, MPU6880_GYRO_CONFIG, 0x18); if (res) { dev_err(&client->dev, "set MPU6880_GYRO_CONFIG error,res: %d!\n", res); return res; } msleep(10); res = sensor_write_reg(client, MPU6880_ACCEL_CONFIG, 0x00); if (res) { dev_err(&client->dev, "set MPU6880_ACCEL_CONFIG error,res: %d!\n", res); return res; } msleep(10); res = sensor_write_reg(client, MPU6880_ACCEL_CONFIG2, 0x00); if (res) { dev_err(&client->dev, "set MPU6880_ACCEL_CONFIG2 error,res: %d!\n", res); return res; } res = sensor_write_reg(client, MPU6880_PWR_MGMT_2, 0x3F); if (res) { dev_err(&client->dev, "set MPU6880_PWR_MGMT_2 error,res: %d!\n", res); return res; } msleep(10); res = sensor_write_reg(client, MPU6880_PWR_MGMT_1, 0x41); if (res) { dev_err(&client->dev, "set MPU6880_PWR_MGMT_1 error,res: %d!\n", res); return res; } msleep(10); res = sensor->ops->active(client, 0, sensor->pdata->poll_delay_ms); if (res) { dev_err(&client->dev, "%s:line=%d,error\n", __func__, __LINE__); return res; } return res; } 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; } 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; short x, y, z; struct sensor_axis axis; u8 buffer[6] = {0}; char value = 0; if (sensor->ops->read_len < 6) { dev_err(&client->dev, "%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); x = ((buffer[0] << 8) & 0xff00) + (buffer[1] & 0xFF); y = ((buffer[2] << 8) & 0xff00) + (buffer[3] & 0xFF); z = ((buffer[4] << 8) & 0xff00) + (buffer[5] & 0xFF); 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)) value = sensor_read_reg(client, sensor->ops->int_status_reg); return ret; } static struct sensor_operate gsensor_mpu6880_ops = { .name = "mpu6880_acc", .type = SENSOR_TYPE_ACCEL, .id_i2c = ACCEL_ID_MPU6880, .read_reg = MPU6880_ACCEL_XOUT_H, .read_len = 6, .id_reg = MPU6880_WHOAMI, .id_data = MPU6880_DEVICE_ID, .precision = MPU6880_PRECISION, .ctrl_reg = MPU6880_PWR_MGMT_2, .int_status_reg = MPU6880_INT_STATUS, .range = {-32768, 32768}, .trig = IRQF_TRIGGER_HIGH | IRQF_ONESHOT, .active = sensor_active, .init = sensor_init, .report = sensor_report_value, }; /****************operate according to sensor chip:end************/ static int gsensor_mpu6880_probe(struct i2c_client *client, const struct i2c_device_id *devid) { return sensor_register_device(client, NULL, devid, &gsensor_mpu6880_ops); } static int gsensor_mpu6880_remove(struct i2c_client *client) { return sensor_unregister_device(client, NULL, &gsensor_mpu6880_ops); } static const struct i2c_device_id gsensor_mpu6880_id[] = { {"mpu6880_acc", ACCEL_ID_MPU6880}, {} }; static struct i2c_driver gsensor_mpu6880_driver = { .probe = gsensor_mpu6880_probe, .remove = gsensor_mpu6880_remove, .shutdown = sensor_shutdown, .id_table = gsensor_mpu6880_id, .driver = { .name = "gsensor_mpu6880", #ifdef CONFIG_PM .pm = &sensor_pm_ops, #endif }, }; module_i2c_driver(gsensor_mpu6880_driver); MODULE_AUTHOR("oeh "); MODULE_DESCRIPTION("mpu6880 3-Axis accelerometer driver"); MODULE_LICENSE("GPL");