/**************************************************************************** * drivers/sensors/msa301.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #if defined(CONFIG_I2C) && defined(CONFIG_SENSORS_MSA301) /**************************************************************************** * Private Types ****************************************************************************/ struct msa301_dev_s { FAR struct i2c_master_s * i2c; /* I2C interface */ uint8_t addr; /* I2C address */ msa301_range_t range; FAR const struct msa301_ops_s *ops; sem_t exclsem; struct msa301_sensor_data_s sensor_data; /* Sensor data container */ }; struct msa301_ops_s { CODE int (*config)(FAR struct msa301_dev_s *priv); CODE int (*start)(FAR struct msa301_dev_s *priv); CODE int (*stop)(FAR struct msa301_dev_s *priv); CODE int (*sensor_read)(FAR struct msa301_dev_s *priv); }; /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ # ifndef CONFIG_MSA301_I2C_FREQUENCY # define CONFIG_MSA301_I2C_FREQUENCY 400000 # endif /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /* I2C Helpers */ static int msa301_readreg8(FAR struct msa301_dev_s *priv, uint8_t regaddr, FAR uint8_t *regval); static int msa301_writereg8(FAR struct msa301_dev_s *priv, uint8_t regaddr, uint8_t regval); static int msa301_readreg(FAR struct msa301_dev_s *priv, uint8_t regaddr, FAR uint8_t *regval, uint8_t len); /* Accelerometer Operations */ static int msa301_sensor_config(FAR struct msa301_dev_s *priv); static int msa301_sensor_start(FAR struct msa301_dev_s *priv); static int msa301_sensor_stop(FAR struct msa301_dev_s *priv); static int msa301_sensor_read(FAR struct msa301_dev_s *priv); /* Character Driver Methods */ static int msa301_open(FAR struct file *filep); static int msa301_close(FAR struct file *filep); static ssize_t msa301_read(FAR struct file *filep, FAR char *buffer, size_t buflen); static ssize_t msa301_write(FAR struct file *filep, FAR const char *buffer, size_t buflen); static int msa301_ioctl(FAR struct file *filep, int cmd, unsigned long arg); /* Common Register Function */ static int msa301_register(FAR const char * devpath, FAR struct i2c_master_s * i2c, uint8_t addr, FAR const struct msa301_ops_s *ops); /**************************************************************************** * Private Data ****************************************************************************/ static const struct file_operations g_fops = { msa301_open, /* open */ msa301_close, /* close */ msa301_read, /* read */ msa301_write, /* write */ NULL, /* seek */ msa301_ioctl, /* ioctl */ NULL /* poll */ #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS , NULL /* unlink */ #endif }; static const struct msa301_ops_s g_msa301_sensor_ops = { msa301_sensor_config, msa301_sensor_start, msa301_sensor_stop, msa301_sensor_read, }; /**************************************************************************** * Private Functions ****************************************************************************/ static int msa301_readreg(FAR struct msa301_dev_s *priv, uint8_t regaddr, FAR uint8_t *regval, uint8_t len) { struct i2c_config_s config; int ret; /* Sanity check */ DEBUGASSERT(priv != NULL); DEBUGASSERT(regval != NULL); /* Set up the I2C configuration */ config.frequency = CONFIG_MSA301_I2C_FREQUENCY; config.address = priv->addr; config.addrlen = 7; /* Write the register address */ ret = i2c_write(priv->i2c, &config, ®addr, sizeof(regaddr)); if (ret < 0) { snerr("ERROR: i2c_write failed: %d\n", ret); return ret; } /* Restart and read 8 bits from the register */ ret = i2c_read(priv->i2c, &config, regval, len); if (ret < 0) { snerr("ERROR: i2c_read failed: %d\n", ret); return ret; } return OK; } /**************************************************************************** * Name: msa301_readreg8 * * Description: * Read from an 8-bit register. * ****************************************************************************/ static int msa301_readreg8(FAR struct msa301_dev_s *priv, uint8_t regaddr, FAR uint8_t *regval) { struct i2c_config_s config; int ret; /* Sanity check */ DEBUGASSERT(priv != NULL); DEBUGASSERT(regval != NULL); /* Set up the I2C configuration */ config.frequency = CONFIG_MSA301_I2C_FREQUENCY; config.address = priv->addr; config.addrlen = 7; /* Write the register address */ ret = i2c_write(priv->i2c, &config, ®addr, sizeof(regaddr)); if (ret < 0) { snerr("ERROR: i2c_write failed: %d\n", ret); return ret; } /* Restart and read 8 bits from the register */ ret = i2c_read(priv->i2c, &config, regval, sizeof(*regval)); if (ret < 0) { snerr("ERROR: i2c_read failed: %d\n", ret); return ret; } sninfo("addr: %02x value: %02x\n", regaddr, *regval); return OK; } /**************************************************************************** * Name: msa301_writereg8 * * Description: * Write to an 8-bit register. * ****************************************************************************/ static int msa301_writereg8(FAR struct msa301_dev_s *priv, uint8_t regaddr, uint8_t regval) { struct i2c_config_s config; uint8_t buffer[2]; int ret; /* Sanity check */ DEBUGASSERT(priv != NULL); /* Set up a 2-byte message to send */ buffer[0] = regaddr; buffer[1] = regval; /* Set up the I2C configuration */ config.frequency = CONFIG_MSA301_I2C_FREQUENCY; config.address = priv->addr; config.addrlen = 7; /* Write the register address followed by the data (no RESTART) */ ret = i2c_write(priv->i2c, &config, buffer, sizeof(buffer)); if (ret < 0) { snerr("ERROR: i2c_write failed: %d\n", ret); return ret; } sninfo("addr: %02x value: %02x\n", regaddr, regval); return OK; } static int msa301_set_range(FAR struct msa301_dev_s *priv, msa301_range_t range) { uint8_t ctl; if (range > MSA301_RANGE_16_G) { return -1; } msa301_readreg8(priv, MSA301_REG_RESRANGE, &ctl); ctl &= ~(MSA301_CTL_RANGE_MASK); ctl |= (range << MSA301_CTL_RANGE_SHIFT); msa301_writereg8(priv, MSA301_REG_RESRANGE, ctl); priv->range = range; return OK; } static int msa301_set_rate(FAR struct msa301_dev_s *priv, msa301_rate_t rate) { uint8_t ctl; msa301_readreg8(priv, MSA301_REG_ODR, &ctl); ctl &= ~(MSA301_CTL_RATE_MASK); ctl |= (rate << MSA301_CTL_RATE_SHIFT); msa301_writereg8(priv, MSA301_REG_ODR, ctl); return OK; } static int msa301_set_powermode(FAR struct msa301_dev_s *priv, msa301_powermode_t mode) { uint8_t ctl; msa301_readreg8(priv, MSA301_REG_POWERMODE, &ctl); ctl &= ~(MSA301_CTL_POWERMODE_MASK); ctl |= (mode << MSA301_CTL_POWERMODE_SHIFT); msa301_writereg8(priv, MSA301_REG_POWERMODE, ctl); return OK; } static int msa301_set_resolution(FAR struct msa301_dev_s *priv, msa301_resolution_t resolution) { uint8_t ctl; msa301_readreg8(priv, MSA301_REG_RESRANGE, &ctl); ctl &= ~(MSA301_CTL_RESOLUTION_MASK); ctl |= (resolution << MSA301_CTL_RESOLUTION_SHIFT); msa301_writereg8(priv, MSA301_REG_RESRANGE, ctl); return OK; } static int msa301_set_axis(FAR struct msa301_dev_s *priv, uint8_t enable) { uint8_t ctl; msa301_readreg8(priv, MSA301_REG_ODR, &ctl); ctl &= ~(MSA301_CTL_AXIS_MASK); if (enable) { ctl |= (MSA301_ENABLE_AXIS << MSA301_CTL_AXIS_SHIFT); } else { ctl |= (MSA301_DISABLE_AXIS << MSA301_CTL_AXIS_SHIFT); } msa301_writereg8(priv, MSA301_REG_ODR, ctl); return OK; } static int msa301_sensor_config(FAR struct msa301_dev_s *priv) { /* Sanity check */ DEBUGASSERT(priv != NULL); msa301_set_resolution(priv, MSA301_RESOLUTION_14); msa301_set_rate(priv, MSA301_RATE_500_HZ); msa301_set_range(priv, MSA301_RANGE_4_G); msa301_set_powermode(priv, MSA301_SUSPENDMODE); return OK; } /**************************************************************************** * Name: msa301_sensor_start * * Description: * Start the accelerometer. * ****************************************************************************/ static int msa301_sensor_start(FAR struct msa301_dev_s *priv) { /* Sanity check */ DEBUGASSERT(priv != NULL); /* Power normal */ msa301_set_powermode(priv, MSA301_NORMALMODE); /* Enable the accelerometer */ msa301_set_axis(priv, 1); up_mdelay(5); sninfo("Starting...."); return OK; } /**************************************************************************** * Name: msa301_sensor_stop * * Description: * Stop the accelerometer. * ****************************************************************************/ static int msa301_sensor_stop(FAR struct msa301_dev_s *priv) { /* Sanity check */ DEBUGASSERT(priv != NULL); /* Disable the accelerometer */ msa301_set_axis(priv, 0); /* Power suspend */ msa301_set_powermode(priv, MSA301_SUSPENDMODE); sninfo("Stopping...."); return OK; } /**************************************************************************** * Name: msa301_sensor_read * * Description: * Read the sensor. * A sensor in a steady state on a horizontal surface will * measure 0 g on both the X-axis and Y-axis, whereas the Z-axis will * measure 1 g. The X- and Y-axis have an offset * of 40 mg/LSB * ****************************************************************************/ static int msa301_sensor_read(FAR struct msa301_dev_s *priv) { uint8_t xyz_value[6]; float scale = 1; DEBUGASSERT(priv != NULL); if (msa301_readreg(priv, MSA301_REG_OUT_X_L, xyz_value, 6) < 0) { return -EIO; } priv->sensor_data.x_data = xyz_value[1] << 8 | xyz_value[0]; priv->sensor_data.y_data = xyz_value[3] << 8 | xyz_value[2]; priv->sensor_data.z_data = xyz_value[5] << 8 | xyz_value[4]; /* 14 bit resolution */ priv->sensor_data.x_data >>= 2; priv->sensor_data.y_data >>= 2; priv->sensor_data.z_data >>= 2; if (priv->range == MSA301_RANGE_2_G) { scale = 4096; } else if (priv->range == MSA301_RANGE_4_G) { scale = 2048; } else if (priv->range == MSA301_RANGE_8_G) { scale = 1024; } else if (priv->range == MSA301_RANGE_16_G) { scale = 512; } priv->sensor_data.x_acc = (float)priv->sensor_data.x_data / scale; priv->sensor_data.y_acc = (float)priv->sensor_data.y_data / scale; priv->sensor_data.z_acc = (float)priv->sensor_data.z_data / scale; return OK; } /**************************************************************************** * Name: msa301_open * * Description: * This method is called when the device is opened. * ****************************************************************************/ static int msa301_open(FAR struct file *filep) { FAR struct inode * inode; FAR struct msa301_dev_s *priv; DEBUGASSERT(filep != NULL); inode = filep->f_inode; DEBUGASSERT(inode != NULL); priv = (FAR struct msa301_dev_s *)inode->i_private; DEBUGASSERT(priv != NULL); nxsem_wait(&priv->exclsem); priv->ops->start(priv); return OK; } /**************************************************************************** * Name: msa301_close * * Description: * This method is called when the device is closed. * ****************************************************************************/ static int msa301_close(FAR struct file *filep) { FAR struct inode * inode; FAR struct msa301_dev_s *priv; DEBUGASSERT(filep != NULL); inode = filep->f_inode; DEBUGASSERT(inode != NULL); priv = (FAR struct msa301_dev_s *)inode->i_private; DEBUGASSERT(priv != NULL); priv->ops->stop(priv); nxsem_post(&priv->exclsem); return OK; } /**************************************************************************** * Name: msa301_read * * Description: * The standard read method. * ****************************************************************************/ static ssize_t msa301_read(FAR struct file *filep, FAR char *buffer, size_t buflen) { FAR struct inode * inode; FAR struct msa301_dev_s *priv; int datalen = sizeof(struct msa301_sensor_data_s); /* Sanity check */ DEBUGASSERT(filep != NULL); inode = filep->f_inode; DEBUGASSERT(inode != NULL); priv = (FAR struct msa301_dev_s *)inode->i_private; DEBUGASSERT(priv != NULL); DEBUGASSERT(buffer != NULL); if (buflen < sizeof(struct msa301_sensor_data_s)) { return -ENOMEM; } if (priv->ops->sensor_read(priv) < 0) { return -EIO; } memcpy(buffer, &priv->sensor_data, datalen); return datalen; } /**************************************************************************** * Name: msa301_write * * Description: * A dummy write method. * ****************************************************************************/ static ssize_t msa301_write(FAR struct file *filep, FAR const char *buffer, size_t buflen) { return -ENOSYS; } /**************************************************************************** * Name: msa301_ioctl * * Description: * The standard ioctl method. * ****************************************************************************/ static int msa301_ioctl(FAR struct file *filep, int cmd, unsigned long arg) { FAR struct inode * inode; FAR struct msa301_dev_s *priv; int ret; /* Sanity check */ DEBUGASSERT(filep != NULL); inode = filep->f_inode; DEBUGASSERT(inode != NULL); priv = (FAR struct msa301_dev_s *)inode->i_private; DEBUGASSERT(priv != NULL); /* Handle ioctl commands */ switch (cmd) { case SNIOC_MSA301_START: ret = priv->ops->start(priv); break; case SNIOC_MSA301_STOP: ret = priv->ops->stop(priv); break; case SNIOC_MSA301_SET_RANGE: ret = msa301_set_range(priv, arg); break; case SNIOC_MSA301_SET_RATE: ret = msa301_set_rate(priv, arg); break; /* Unrecognized commands */ default: snerr("ERROR: Unrecognized cmd: %d arg: %lu\n", cmd, arg); ret = -ENOTTY; break; } return ret; } /**************************************************************************** * Name: msa301_register * * Description: * Register the msa301 accelerometer, gyroscope device as 'devpath'. * * Input Parameters: * devpath - The full path to the driver to register, e.g. * "/dev/msa301". * i2c - An I2C driver instance. * addr - The I2C address of the msa301 accelerometer, gyroscope or * magnetometer. * ops - The device operations structure. * * Returned Value: * Zero (OK) on success; a negated errno value on failure. * ****************************************************************************/ static int msa301_register(FAR const char * devpath, FAR struct i2c_master_s * i2c, uint8_t addr, FAR const struct msa301_ops_s *ops) { FAR struct msa301_dev_s *priv; int ret; uint8_t id = 0; /* Sanity check */ DEBUGASSERT(devpath != NULL); DEBUGASSERT(i2c != NULL); /* Initialize the device's structure */ priv = (FAR struct msa301_dev_s *)kmm_malloc(sizeof(*priv)); if (priv == NULL) { snerr("ERROR: Failed to allocate instance\n"); return -ENOMEM; } priv->i2c = i2c; priv->addr = addr; priv->ops = ops; /* ID check */ msa301_readreg8(priv, MSA301_REG_PARTID, &id); if (id != 0x13) { snerr("ERROR: Failed to read msa301 id\n"); kmm_free(priv); return -EIO; } /* Configure the device */ ret = priv->ops->config(priv); if (ret < 0) { snerr("ERROR: Failed to configure device: %d\n", ret); kmm_free(priv); return ret; } nxsem_init(&priv->exclsem, 0, 1); /* Register the character driver */ ret = register_driver(devpath, &g_fops, 0666, priv); if (ret < 0) { snerr("ERROR: Failed to register driver: %d\n", ret); nxsem_destroy(&priv->exclsem); kmm_free(priv); return ret; } return OK; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: msa301_sensor_register * * Description: * Register the msa301 accelerometer character device as 'devpath'. * * Input Parameters: * devpath - The full path to the driver to register, * e.g. "/dev/msa301". * i2c - An I2C driver instance. * addr - The I2C address of the msa301 accelerometer. * * Returned Value: * Zero (OK) on success; a negated errno value on failure. * ****************************************************************************/ int msa301_sensor_register(FAR const char * devpath, FAR struct i2c_master_s *i2c) { return msa301_register(devpath, i2c, MSA301_ACCEL_ADDR0, &g_msa301_sensor_ops); } #endif /* CONFIG_I2C && CONFIG_SENSORS_MSA301 */