/**************************************************************************** * drivers/sensors/isl29023.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 #include #if defined(CONFIG_I2C) && defined(CONFIG_SENSORS_ISL29023) /**************************************************************************** * Pre-Processor Definitions ****************************************************************************/ #ifndef CONFIG_ISL29023_I2C_FREQUENCY # define CONFIG_ISL29023_I2C_FREQUENCY 400000 #endif /* Registers definitions */ #define ISL29023_COMMAND_1 0x00 #define ISL29023_COMMAND_2 0x01 #define ISL29023_DATA_LSB 0x02 #define ISL29023_DATA_MSB 0x03 #define ISL29023_INT_LT_LSB 0x04 #define ISL29023_INT_LT_MSB 0x05 #define ISL29023_INT_HT_LSB 0x06 #define ISL29023_INT_HT_MSB 0x07 #define ISL29023_TEST 0x08 /* Registers definitions */ #define ISL29023_RESOLUTION_MASK 0x3 #define ISL29023_RESOLUTION_SHIFT 0x2 #define ISL29023_ALS_RANGE_MASK 0x3 #define ISL29023_ALS_RANGE_SHIFT 0x0 #define ISL29023_OP_MODE_MASK 0x7 #define ISL29023_OP_MODE_SHIFT 0x5 /**************************************************************************** * Private Types ****************************************************************************/ struct isl29023_dev_s { FAR struct i2c_master_s *i2c; uint8_t addr; /* Address on the I2C bus */ uint8_t op_mode; /* Defined by isl29023_operational_mode_e */ uint32_t resolution; /* Sensor ADC res in counts (16..65536) */ uint32_t range; /* Sensor range (1000..64000) */ }; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /* I2C Helpers */ static int isl29023_i2c_write(FAR struct isl29023_dev_s *dev, FAR const uint8_t *buffer, ssize_t buflen); static int isl29023_i2c_read(FAR struct isl29023_dev_s *dev, FAR uint8_t *buffer, ssize_t buflen); static int isl29023_read_reg(FAR struct isl29023_dev_s *dev, const uint8_t regaddr, uint8_t *buffer, size_t buflen); static int isl29023_read_lux(FAR struct isl29023_dev_s *dev, FAR struct isl29023_data_s *data); static int isl29023_set_op_mode(FAR struct isl29023_dev_s *dev, uint8_t mode); static int isl29023_set_resolution(FAR struct isl29023_dev_s *dev, uint8_t res_mode); static int isl29023_set_range(FAR struct isl29023_dev_s *dev, uint8_t range_mode); /* Driver methods */ static int isl29023_open(FAR struct file *filep); static int isl29023_close(FAR struct file *filep); static ssize_t isl29023_read(FAR struct file *filep, FAR char *buffer, size_t buflen); static ssize_t isl29023_write(FAR struct file *filep, FAR const char *buffer, size_t buflen); static int isl29023_ioctl(FAR struct file *filep, int cmd, unsigned long arg); /**************************************************************************** * Private Data ****************************************************************************/ static const struct file_operations g_isl29023fops = { isl29023_open, /* open */ isl29023_close, /* close */ isl29023_read, /* read */ isl29023_write, /* write */ NULL, /* seek */ isl29023_ioctl, /* ioctl */ NULL /* poll */ }; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: isl29023_i2c_write * * Description: * Write to the I2C device. * ****************************************************************************/ static int isl29023_i2c_write(FAR struct isl29023_dev_s *dev, FAR const uint8_t *buffer, ssize_t buflen) { struct i2c_msg_s msg; int ret; /* Setup for the transfer */ msg.frequency = CONFIG_ISL29023_I2C_FREQUENCY, msg.addr = dev->addr; msg.flags = 0; msg.buffer = (FAR uint8_t *)buffer; /* Override const */ msg.length = buflen; /* Then perform the transfer. */ ret = I2C_TRANSFER(dev->i2c, &msg, 1); return (ret >= 0) ? OK : ret; } /**************************************************************************** * Name: isl29023_i2c_read * * Description: * Read from the I2C device. * ****************************************************************************/ static int isl29023_i2c_read(FAR struct isl29023_dev_s *dev, FAR uint8_t *buffer, ssize_t buflen) { struct i2c_msg_s msg; int ret; /* Setup for the transfer */ msg.frequency = CONFIG_ISL29023_I2C_FREQUENCY, msg.addr = dev->addr, msg.flags = I2C_M_READ; msg.buffer = buffer; msg.length = buflen; /* Then perform the transfer. */ ret = I2C_TRANSFER(dev->i2c, &msg, 1); return (ret >= 0) ? OK : ret; } /**************************************************************************** * Name: isl29023_read_reg * * Description: * Read register from the I2C device. * ****************************************************************************/ static int isl29023_read_reg(FAR struct isl29023_dev_s *dev, const uint8_t regaddr, uint8_t *buffer, size_t buflen) { int ret; ret = isl29023_i2c_write(dev, ®addr, 1); if (ret < 0) { snerr("ERROR: i2c write failed: %d\n", ret); return ret; } ret = isl29023_i2c_read(dev, buffer, buflen); if (ret < 0) { snerr("ERROR: i2c read failed: %d\n", ret); return ret; } return ret; } /**************************************************************************** * Name: isl29023_open * * Description: * This function is called whenever the ISL29023 device is opened. * ****************************************************************************/ static int isl29023_open(FAR struct file *filep) { return OK; } /**************************************************************************** * Name: isl29023_close * * Description: * This routine is called when the ISL29023 device is closed. * ****************************************************************************/ static int isl29023_close(FAR struct file *filep) { return OK; } /**************************************************************************** * Name: isl29023_read ****************************************************************************/ static ssize_t isl29023_read(FAR struct file *filep, FAR char *buffer, size_t buflen) { FAR struct inode *inode = filep->f_inode; FAR struct isl29023_dev_s *priv = inode->i_private; int ret; struct isl29023_data_s data; ret = isl29023_read_lux(priv, &data); if (ret < 0) { snerr("ERROR: failed to read the sensor: %d\n", ret); return (ssize_t)ret; } else { if (buflen < sizeof(data)) { return -EIO; } memcpy(buffer, &data, sizeof(data)); } return buflen; } /**************************************************************************** * Name: isl29023_write ****************************************************************************/ static ssize_t isl29023_write(FAR struct file *filep, FAR const char *buffer, size_t buflen) { return -ENOSYS; } /**************************************************************************** * Name: isl29023_read_lux ****************************************************************************/ static int isl29023_read_lux(FAR struct isl29023_dev_s *dev, FAR struct isl29023_data_s *data) { int ret; uint8_t buffer[2]; ret = isl29023_read_reg(dev, ISL29023_DATA_LSB, buffer, 2); if (ret < 0) { return ret; } data->raw = (buffer[1] << 8) | buffer[0]; add_sensor_randomness(data->raw); uint32_t tmp = (data->raw * dev->range) / dev->resolution; data->lux = (uint16_t)tmp; sninfo("raw value %8x, lux: %5u\n", data->raw, data->lux); return OK; } /**************************************************************************** * Name: isl29023_set_op_mode ****************************************************************************/ static int isl29023_set_op_mode(FAR struct isl29023_dev_s *dev, uint8_t mode) { uint8_t buffer[2]; int ret; ret = isl29023_read_reg(dev, ISL29023_COMMAND_1, &buffer[1], 1); if (ret < 0) { snerr("ERROR: i2c read reg failed: %d\n", ret); return ret; } /* Clear the mode bits */ buffer[1] &= ~(ISL29023_OP_MODE_MASK << ISL29023_OP_MODE_SHIFT); mode &= ISL29023_OP_MODE_MASK; /* Modify mode bits */ buffer[1] |= mode << ISL29023_OP_MODE_SHIFT; buffer[0] = ISL29023_COMMAND_1; dev->op_mode = mode; sninfo("mode: %x\n", dev->op_mode); return isl29023_i2c_write(dev, buffer, 2); } /**************************************************************************** * Name: isl29023_set_resolution ****************************************************************************/ static int isl29023_set_resolution(FAR struct isl29023_dev_s *dev, uint8_t res_mode) { uint8_t buffer[2]; int ret; ret = isl29023_read_reg(dev, ISL29023_COMMAND_2, &buffer[1], 1); if (ret < 0) { snerr("ERROR: i2c read reg failed: %d\n", ret); return ret; } /* Clear the mode bits */ buffer[1] &= ~(ISL29023_RESOLUTION_MASK << ISL29023_RESOLUTION_SHIFT); res_mode &= ISL29023_RESOLUTION_MASK; /* Modify mode bits */ buffer[1] |= res_mode << ISL29023_RESOLUTION_SHIFT; buffer[0] = ISL29023_COMMAND_2; dev->resolution = 1u << (16u - res_mode * 4u); sninfo("resolution: %" PRIu32 "\n", dev->resolution); return isl29023_i2c_write(dev, buffer, 2); } /**************************************************************************** * Name: isl29023_set_resolution ****************************************************************************/ static int isl29023_set_range(FAR struct isl29023_dev_s *dev, uint8_t range_mode) { uint8_t buffer[2]; int ret; ret = isl29023_read_reg(dev, ISL29023_COMMAND_2, &buffer[1], 1); if (ret < 0) { snerr("ERROR: i2c read reg failed: %d\n", ret); return ret; } /* Clear the mode bits */ buffer[1] &= ~(ISL29023_ALS_RANGE_MASK << ISL29023_ALS_RANGE_SHIFT); /* Modify mode bits */ range_mode &= ISL29023_ALS_RANGE_MASK; buffer[1] |= range_mode << ISL29023_ALS_RANGE_SHIFT; buffer[0] = ISL29023_COMMAND_2; dev->range = 1000u * (1u << range_mode) * (1u << range_mode); sninfo("range: %" PRIu32 "\n", dev->range); return isl29023_i2c_write(dev, buffer, 2); } /**************************************************************************** * Name: isl29023_ioctl ****************************************************************************/ static int isl29023_ioctl(FAR struct file *filep, int cmd, unsigned long arg) { FAR struct inode *inode = filep->f_inode; FAR struct isl29023_dev_s *priv = inode->i_private; int ret = OK; switch (cmd) { /* Write to the COMMAND1 register. Arg: uint8_t value */ case SNIOC_SET_OPERATIONAL_MODE: ret = isl29023_set_op_mode(priv, (uint8_t)arg); sninfo("Set operation mode %d with result %d\n", (uint8_t)arg, ret); break; /* Write to the COMMAND2 register. Arg: uint8_t value */ case SNIOC_SET_RESOLUTION: ret = isl29023_set_resolution(priv, (uint8_t)arg); sninfo("Set resolution mode %d with result %d\n", (uint8_t)arg, ret); break; /* Write to the COMMAND2 register. Arg: uint8_t value */ case SNIOC_SET_RANGE: ret = isl29023_set_range(priv, (uint8_t)arg); sninfo("Set range mode %d with result %d\n", (uint8_t)arg, ret); break; default: sninfo("Unrecognized cmd: 0x%04x\n", cmd); ret = -ENOTTY; break; } return ret; } /**************************************************************************** * Public Functions ****************************************************************************/ int isl29023_register(FAR const char *devpath, FAR struct i2c_master_s *i2c, uint8_t addr) { FAR struct isl29023_dev_s *priv; int ret; priv = (FAR struct isl29023_dev_s *) kmm_malloc(sizeof(struct isl29023_dev_s)); if (priv == NULL) { snerr("ERROR: Failed to allocate instance\n"); return -ENOMEM; } priv->i2c = i2c; priv->addr = addr; priv->resolution = 0x10000; priv->range = 64000; priv->op_mode = ISL29023_OP_MODE_POWER_DOWN; /* Register the character driver */ ret = register_driver(devpath, &g_isl29023fops, 0666, priv); if (ret < 0) { snerr("ERROR: Failed to register driver: %d\n", ret); kmm_free(priv); } return ret; } #endif /* CONFIG_I2C && CONFIG_SENSORS_ISL29023 */