/**************************************************************************** * drivers/sensors/sps30.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 #include #include #include #include #if defined(CONFIG_SENSORS_SPS30) /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #ifdef CONFIG_SPS30_DEBUG # define sps30_dbg(x, ...) _info(x, ##__VA_ARGS__) #else # define sps30_dbg(x, ...) sninfo(x, ##__VA_ARGS__) #endif #ifndef CONFIG_SPS30_I2C_FREQUENCY # define CONFIG_SPS30_I2C_FREQUENCY 100000 #endif #define SPS30_MEASUREMENT_INTERVAL 1 /* one second, fixed in hw */ #define SPS30_MEASUREMENT_MODE 0x0300 #define SPS30_I2C_RETRIES 3 /* SPS30 command words */ #define SPS30_CMD_START_MEASUREMENT 0x0010 #define SPS30_CMD_STOP_MEASUREMENT 0x0104 #define SPS30_CMD_GET_DATA_READY 0x0202 #define SPS30_CMD_READ_MEASUREMENT 0x0300 #define SPS30_CMD_SET_AUTO_CLEANING_INTERVAL 0x8004 #define SPS30_CMD_START_FAN_CLEANING 0x5607 #define SPS30_CMD_READ_ARTICLE_CODE 0xd025 #define SPS30_CMD_READ_SERIAL_NUMBER 0xd033 #define SPS30_CMD_SOFT_RESET 0xd304 /**************************************************************************** * Private ****************************************************************************/ struct sps30_dev_s { #ifdef CONFIG_SPS30_I2C FAR struct i2c_master_s *i2c; /* I2C interface */ uint8_t addr; /* I2C address */ #endif bool valid; /* If cached readings are valid */ bool started; /* If continuous measurement is enabled */ #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS bool unlinked; /* True, driver has been unlinked */ #endif struct timespec last_update; /* Last time when sensor was read */ #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS int16_t crefs; /* Number of open references */ #endif mutex_t devlock; /* Cached sensor values */ struct sps30_conv_data_s data; }; struct sps30_word_s { uint8_t data[2]; uint8_t crc; }; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /* IO Helpers */ #ifdef CONFIG_SPS30_I2C static int sps30_do_transfer(FAR struct i2c_master_s *i2c, FAR struct i2c_msg_s *msgv, size_t nmsg); #endif static int sps30_write_cmd(FAR struct sps30_dev_s *priv, uint16_t cmd, FAR struct sps30_word_s *params, unsigned int num_params); static int sps30_read_cmd(FAR struct sps30_dev_s *priv, uint16_t cmd, FAR struct sps30_word_s *words, unsigned int num_words); /* Data conversion */ static uint8_t sps30_crc_word(uint16_t word); static void sps30_set_command_param(FAR struct sps30_word_s *param, uint16_t value); static int sps30_check_data_crc(FAR const struct sps30_word_s *words, unsigned int num_words); static uint16_t sps30_data_word2uint16(FAR const struct sps30_word_s *word); static float sps30_data_words2float(FAR const struct sps30_word_s words[2]); /* Driver features */ static int sps30_read_values(FAR struct sps30_dev_s *priv, FAR struct sps30_conv_data_s *out, bool wait); static int sps30_configure(FAR struct sps30_dev_s *priv, bool start); static int sps30_read_dev_info(FAR struct sps30_dev_s *priv, uint16_t cmd, char *out, size_t outlen); /* Character driver methods */ #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS static int sps30_open(FAR struct file *filep); static int sps30_close(FAR struct file *filep); #endif static ssize_t sps30_read(FAR struct file *filep, FAR char *buffer, size_t buflen); static ssize_t sps30_write(FAR struct file *filep, FAR const char *buffer, size_t buflen); static int sps30_ioctl(FAR struct file *filep, int cmd, unsigned long arg); #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS static int sps30_unlink(FAR struct inode *inode); #endif /**************************************************************************** * Private Data ****************************************************************************/ static const struct file_operations g_sps30fops = { #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS sps30_open, /* open */ sps30_close, /* close */ #else NULL, /* open */ NULL, /* close */ #endif sps30_read, /* read */ sps30_write, /* write */ NULL, /* seek */ sps30_ioctl, /* ioctl */ NULL, /* mmap */ NULL, /* truncate */ NULL /* poll */ #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS , sps30_unlink /* unlink */ #endif }; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: sps30_do_transfer ****************************************************************************/ #ifdef CONFIG_SPS30_I2C static int sps30_do_transfer(FAR struct i2c_master_s *i2c, FAR struct i2c_msg_s *msgv, size_t nmsg) { int ret = -EIO; int retries; for (retries = 0; retries < SPS30_I2C_RETRIES; retries++) { ret = I2C_TRANSFER(i2c, msgv, nmsg); if (ret >= 0) { return 0; } else { /* Some error. Try to reset I2C bus and keep trying. */ #ifdef CONFIG_I2C_RESET if (retries == SPS30_I2C_RETRIES - 1) { break; } ret = I2C_RESET(i2c); if (ret < 0) { sps30_dbg("I2C_RESET failed: %d\n", ret); return ret; } #endif } } sps30_dbg("xfer failed: %d\n", ret); return ret; } #endif /**************************************************************************** * Name: sps30_write_cmd ****************************************************************************/ static int sps30_write_cmd(FAR struct sps30_dev_s *priv, uint16_t cmd, FAR struct sps30_word_s *params, unsigned int num_params) { #ifdef CONFIG_SPS30_I2C struct i2c_msg_s msg[2]; uint8_t cmd_buf[2]; int ret; cmd_buf[0] = cmd >> 8; cmd_buf[1] = cmd >> 0; msg[0].frequency = CONFIG_SPS30_I2C_FREQUENCY; msg[0].addr = priv->addr; msg[0].flags = 0; msg[0].buffer = cmd_buf; msg[0].length = 2; if (num_params) { msg[1].frequency = CONFIG_SPS30_I2C_FREQUENCY; msg[1].addr = priv->addr; msg[1].flags = I2C_M_NOSTART; msg[1].buffer = (FAR uint8_t *)params; msg[1].length = num_params * sizeof(*params); } ret = sps30_do_transfer(priv->i2c, msg, (num_params) ? 2 : 1); sps30_dbg("cmd: 0x%04X num_params: %d ret: %d\n", cmd, num_params, ret); return (ret >= 0) ? OK : ret; #else /* UART mode not implemented yet. */ return -ENODEV; #endif } /**************************************************************************** * Name: sps30_read_words ****************************************************************************/ static int sps30_read_cmd(FAR struct sps30_dev_s *priv, uint16_t cmd, FAR struct sps30_word_s *words, unsigned int num_words) { #ifdef CONFIG_SPS30_I2C struct i2c_msg_s msg[1]; uint8_t addr_buf[2]; int ret; addr_buf[0] = cmd >> 8; addr_buf[1] = cmd >> 0; msg[0].frequency = CONFIG_SPS30_I2C_FREQUENCY; msg[0].addr = priv->addr; msg[0].flags = 0; msg[0].buffer = addr_buf; msg[0].length = 2; ret = sps30_do_transfer(priv->i2c, msg, 1); sps30_dbg("cmd: 0x%04X ret: %d\n", cmd, ret); if (ret < 0) { return ret; } msg[0].frequency = CONFIG_SPS30_I2C_FREQUENCY; msg[0].addr = priv->addr; msg[0].flags = I2C_M_READ; msg[0].buffer = (FAR uint8_t *)words; msg[0].length = num_words * sizeof(*words); ret = sps30_do_transfer(priv->i2c, msg, 1); sps30_dbg("read cmd: 0x%04X num_params: %d ret: %d\n", cmd, num_words, ret); return (ret >= 0) ? OK : ret; #else /* UART mode not implemented yet. */ return -ENODEV; #endif } /**************************************************************************** * Name: sps30_crc_word ****************************************************************************/ static uint8_t sps30_crc_word(uint16_t word) { static const uint8_t crc_table[16] = { 0x00, 0x31, 0x62, 0x53, 0xc4, 0xf5, 0xa6, 0x97, 0xb9, 0x88, 0xdb, 0xea, 0x7d, 0x4c, 0x1f, 0x2e }; uint8_t crc = 0xff; crc ^= word >> 8; crc = (crc << 4) ^ crc_table[crc >> 4]; crc = (crc << 4) ^ crc_table[crc >> 4]; crc ^= word >> 0; crc = (crc << 4) ^ crc_table[crc >> 4]; crc = (crc << 4) ^ crc_table[crc >> 4]; return crc; } /**************************************************************************** * Name: sps30_set_command_param ****************************************************************************/ static void sps30_set_command_param(FAR struct sps30_word_s *param, uint16_t value) { param->data[0] = value >> 8; param->data[1] = value >> 0; param->crc = sps30_crc_word(value); } /**************************************************************************** * Name: sps30_data_words2float ****************************************************************************/ static float sps30_data_words2float(FAR const struct sps30_word_s words[2]) { uint8_t data[4]; float value; data[3] = words[0].data[0]; data[2] = words[0].data[1]; data[1] = words[1].data[0]; data[0] = words[1].data[1]; memcpy(&value, data, 4); return value; } /**************************************************************************** * Name: sps30_data_word2uint16 ****************************************************************************/ static uint16_t sps30_data_word2uint16(FAR const struct sps30_word_s *word) { return (word[0].data[0] << 8) | (word[0].data[1]); } /**************************************************************************** * Name: sps30_crc_word ****************************************************************************/ static int sps30_check_data_crc(FAR const struct sps30_word_s *words, unsigned int num_words) { while (num_words) { if (sps30_crc_word(sps30_data_word2uint16(words)) != words->crc) { return -1; } num_words--; words++; } return 0; } /**************************************************************************** * Name: sps30_softreset * * Description: * Reset the SPS30 sensor. This takes less than 2000 ms. * ****************************************************************************/ static int sps30_softreset(FAR struct sps30_dev_s *priv) { int ret; ret = sps30_write_cmd(priv, SPS30_CMD_SOFT_RESET, NULL, 0); if (ret < 0) { return ret; } return 0; } /**************************************************************************** * Name: has_time_passed * * Description: * Return true if curr >= start + secs_since_start * ****************************************************************************/ static bool has_time_passed(struct timespec curr, struct timespec start, unsigned int secs_since_start) { if ((long)((start.tv_sec + secs_since_start) - curr.tv_sec) == 0) { return start.tv_nsec <= curr.tv_nsec; } return (long)((start.tv_sec + secs_since_start) - curr.tv_sec) <= 0; } /**************************************************************************** * Name: sps30_read_values ****************************************************************************/ static int sps30_read_values(FAR struct sps30_dev_s *priv, FAR struct sps30_conv_data_s *out, bool wait) { struct sps30_word_s data[20]; struct timespec ts; int ret; clock_systime_timespec(&ts); if (wait || !priv->valid || has_time_passed(ts, priv->last_update, SPS30_MEASUREMENT_INTERVAL)) { while (1) { /* Wait data to be ready. */ ret = sps30_read_cmd(priv, SPS30_CMD_GET_DATA_READY, data, 1); if (ret < 0) { sps30_dbg("ERROR: sps30_read_cmd failed: %d\n", ret); return ret; } if (sps30_check_data_crc(data, 1) < 0) { sps30_dbg("ERROR: sps30_read_words crc failed\n"); ret = -EIO; return ret; } if (sps30_data_word2uint16(data) != 0x0001) { if (!wait) { sps30_dbg("ERROR: data not ready\n"); ret = -EAGAIN; return ret; } ret = nxsig_usleep(500 * 1000); if (ret == -EINTR) { return ret; } } else { break; } } /* Read the raw data */ ret = sps30_read_cmd(priv, SPS30_CMD_READ_MEASUREMENT, data, 20); if (ret < 0) { sps30_dbg("ERROR: sps30_read_cmd failed: %d\n", ret); return ret; } if (sps30_check_data_crc(data, 20) < 0) { sps30_dbg("ERROR: sps30_read_words crc failed\n"); ret = -EIO; return ret; } add_sensor_randomness(((data[0].crc ^ data[1].crc) << 0) ^ ((data[2].crc ^ data[3].crc) << 8) ^ ((data[4].crc ^ data[5].crc) << 16) ^ ((data[6].crc ^ data[7].crc) << 24) ^ ((data[8].crc ^ data[9].crc) << 0) ^ ((data[10].crc ^ data[11].crc) << 8) ^ ((data[12].crc ^ data[13].crc) << 16) ^ ((data[14].crc ^ data[15].crc) << 24) ^ ((data[16].crc ^ data[17].crc) << 0) ^ ((data[18].crc ^ data[19].crc) << 8)); priv->data.mass_concenration_pm1_0 = sps30_data_words2float(data + 0); priv->data.mass_concenration_pm2_5 = sps30_data_words2float(data + 2); priv->data.mass_concenration_pm4_0 = sps30_data_words2float(data + 4); priv->data.mass_concenration_pm10 = sps30_data_words2float(data + 6); priv->data.number_concenration_pm0_5 = sps30_data_words2float(data + 8); priv->data.number_concenration_pm1_0 = sps30_data_words2float(data + 10); priv->data.number_concenration_pm2_5 = sps30_data_words2float(data + 12); priv->data.number_concenration_pm4_0 = sps30_data_words2float(data + 14); priv->data.number_concenration_pm10 = sps30_data_words2float(data + 16); priv->data.typical_particle_size = sps30_data_words2float(data + 18); priv->last_update = ts; priv->valid = true; /* Wait data to be ready. */ ret = sps30_read_cmd(priv, SPS30_CMD_GET_DATA_READY, data, 1); if (ret < 0) { sps30_dbg("ERROR: sps30_read_cmd failed: %d\n", ret); } } *out = priv->data; return OK; } /**************************************************************************** * Name: sps30_read_dev_info ****************************************************************************/ static int sps30_read_dev_info(FAR struct sps30_dev_s *priv, uint16_t cmd, char *out, size_t outlen) { struct sps30_word_s buf[16]; int ret; ret = sps30_read_cmd(priv, cmd, buf, 16); if (ret < 0) { sps30_dbg("ERROR: sps30_read_cmd failed: %d\n", ret); return ret; } if (sps30_check_data_crc(buf, 16) < 0) { sps30_dbg("ERROR: sps30_read_words crc failed\n"); ret = -EIO; return ret; } ret = 0; while (outlen && ret < 32) { *out = buf[ret / 2].data[ret % 2]; ret++; out++; outlen--; } if (outlen) { *out = '\0'; } return ret; } /**************************************************************************** * Name: sps30_configure ****************************************************************************/ static int sps30_configure(FAR struct sps30_dev_s *priv, bool start) { struct sps30_word_s param; int ret; if (!start) { /* Stop measurements. */ ret = sps30_write_cmd(priv, SPS30_CMD_STOP_MEASUREMENT, ¶m, 1); if (ret >= 0) { priv->started = false; } } else { /* Start measurements (and set pressure compensation). */ sps30_set_command_param(¶m, SPS30_MEASUREMENT_MODE); ret = sps30_write_cmd(priv, SPS30_CMD_START_MEASUREMENT, ¶m, 1); if (ret >= 0) { priv->started = true; } } return ret; } /**************************************************************************** * Name: sps30_open * * Description: * This function is called whenever the SPS30x device is opened. * ****************************************************************************/ #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS static int sps30_open(FAR struct file *filep) { FAR struct inode *inode = filep->f_inode; FAR struct sps30_dev_s *priv = inode->i_private; union article_u { uint32_t u32[8]; char c[32]; }; union article_u code; union article_u sn; int ret; /* Get exclusive access */ ret = nxmutex_lock(&dev->devlock); if (ret < 0) { return ret; } /* Increment the count of open references on the driver */ priv->crefs++; DEBUGASSERT(priv->crefs > 0); if (priv->crefs == 1) { /* Read device information. */ ret = sps30_read_dev_info(priv, SPS30_CMD_READ_ARTICLE_CODE, code.c, sizeof(code.c)); if (ret >= 0) { ret = sps30_read_dev_info(priv, SPS30_CMD_READ_SERIAL_NUMBER, sn.c, sizeof(sn.c)); if (ret >= 0) { static int once; if (!once) { once = 1; up_rngaddentropy(RND_SRC_SENSOR, code.u32, (strlen(code.c) + 3) / 4); up_rngaddentropy(RND_SRC_SENSOR, sn.u32, (strlen(sn.c) + 3) / 4); } sps30_dbg("article code: \"%.*s\"\n", 32, code.c); sps30_dbg("serial number: \"%.*s\"\n", 32, sn.c); /* Start sensor. */ ret = sps30_configure(priv, true); } } } if (ret < 0) { priv->crefs--; } nxmutex_unlock(&dev->devlock); return ret; } #endif /**************************************************************************** * Name: sps30_close * * Description: * This routine is called when the SPS30 device is closed. * ****************************************************************************/ #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS static int sps30_close(FAR struct file *filep) { FAR struct inode *inode = filep->f_inode; FAR struct sps30_dev_s *priv = inode->i_private; int ret; /* Get exclusive access */ ret = nxmutex_lock(&dev->devlock); if (ret < 0) { return ret; } /* Decrement the count of open references on the driver */ DEBUGASSERT(priv->crefs > 0); priv->crefs--; /* If the count has decremented to zero and the driver has been unlinked, * then free memory now. */ if (priv->crefs <= 0 && priv->unlinked) { nxmutex_destroy(&priv->devlock); kmm_free(priv); return OK; } nxmutex_unlock(&dev->devlock); return OK; } #endif /**************************************************************************** * Name: sps30_read ****************************************************************************/ static ssize_t sps30_read(FAR struct file *filep, FAR char *buffer, size_t buflen) { FAR struct inode *inode = filep->f_inode; FAR struct sps30_dev_s *priv = inode->i_private; ssize_t length = 0; struct sps30_conv_data_s data; unsigned int data100[10]; int ret; /* Get exclusive access */ ret = nxmutex_lock(&dev->devlock); if (ret < 0) { return ret; } #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS if (priv->unlinked) { /* Do not allow operations on unlinked sensors. This allows * sensor use on hot swappable I2C bus. */ nxmutex_unlock(&dev->devlock); return -ENODEV; } #endif if (!priv->started) { return -ENODATA; } ret = sps30_read_values(priv, &data, !(filep->f_oflags & O_NONBLOCK)); if (ret < 0) { sps30_dbg("cannot read data: %d\n", ret); } else { /* This interface is mainly intended for easy debugging in nsh. */ data100[0] = abs(data.mass_concenration_pm1_0 * 100); data100[1] = abs(data.mass_concenration_pm2_5 * 100); data100[2] = abs(data.mass_concenration_pm4_0 * 100); data100[3] = abs(data.mass_concenration_pm10 * 100); data100[4] = abs(data.number_concenration_pm0_5 * 100); data100[5] = abs(data.number_concenration_pm1_0 * 100); data100[6] = abs(data.number_concenration_pm2_5 * 100); data100[7] = abs(data.number_concenration_pm4_0 * 100); data100[8] = abs(data.number_concenration_pm10 * 100); data100[9] = abs(data.typical_particle_size * 100); length = snprintf(buffer, buflen, "%u.%02u %u.%02u %u.%02u %u.%02u %u.%02u " "%u.%02u %u.%02u %u.%02u %u.%02u %u.%02u\n", data100[0] / 100, data100[0] % 100, data100[1] / 100, data100[1] % 100, data100[2] / 100, data100[2] % 100, data100[3] / 100, data100[3] % 100, data100[4] / 100, data100[4] % 100, data100[5] / 100, data100[5] % 100, data100[6] / 100, data100[6] % 100, data100[7] / 100, data100[7] % 100, data100[8] / 100, data100[8] % 100, data100[9] / 100, data100[9] % 100); if (length > buflen) { length = buflen; } } nxmutex_unlock(&dev->devlock); return length; } /**************************************************************************** * Name: sps30_write ****************************************************************************/ static ssize_t sps30_write(FAR struct file *filep, FAR const char *buffer, size_t buflen) { return -ENOSYS; } /**************************************************************************** * Name: sps30_ioctl ****************************************************************************/ static int sps30_ioctl(FAR struct file *filep, int cmd, unsigned long arg) { FAR struct inode *inode = filep->f_inode; FAR struct sps30_dev_s *priv = inode->i_private; struct sps30_word_s param; int ret; /* Get exclusive access */ ret = nxmutex_lock(&dev->devlock); if (ret < 0) { return ret; } #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS if (priv->unlinked) { /* Do not allow operations on unlinked sensors. This allows * sensor use on hot swappable I2C bus. */ nxmutex_unlock(&dev->devlock); return -ENODEV; } #endif switch (cmd) { /* Soft reset the SPS30, Arg: None */ case SNIOC_RESET: { ret = sps30_softreset(priv); sps30_dbg("softreset ret: %d\n", ret); sps30_configure(priv, priv->started); } break; /* Start background measurement, Arg: None */ case SNIOC_START: { /* Start measurements (and set pressure compensation). */ sps30_set_command_param(¶m, SPS30_MEASUREMENT_MODE); ret = sps30_write_cmd(priv, SPS30_CMD_START_MEASUREMENT, ¶m, 1); if (ret >= 0) { priv->started = true; } } break; /* Stop background measurement, Arg: None */ case SNIOC_STOP: { /* Stop measurements. */ ret = sps30_write_cmd(priv, SPS30_CMD_STOP_MEASUREMENT, NULL, 0); if (ret >= 0) { priv->started = false; } } break; /* Set fan auto cleaning interval measurement interval, Arg: uint32_t */ case SNIOC_SET_CLEAN_INTERVAL: { if (arg != (uint32_t)arg) { ret = -EINVAL; break; } if (arg > 0 && arg < 15) { arg = 15; } sps30_set_command_param(¶m, arg); ret = sps30_write_cmd(priv, SPS30_CMD_SET_AUTO_CLEANING_INTERVAL, ¶m, 1); } break; /* Start fan cleaning, Arg: None */ case SNIOC_START_FAN_CLEANING: { if (!priv->started) { ret = -EBUSY; break; } ret = sps30_write_cmd(priv, SPS30_CMD_START_FAN_CLEANING, NULL, 0); } break; /* Read sensor data, Arg: struct sps30_conv_data_s *data */ case SNIOC_READ_CONVERT_DATA: { FAR struct sps30_conv_data_s *data = (FAR struct sps30_conv_data_s *)arg; ret = sps30_read_values(priv, data, false); if (ret < 0) { sps30_dbg("cannot read data: %d\n", ret); } } break; default: sps30_dbg("Unrecognized cmd: %d\n", cmd); ret = -ENOTTY; break; } nxmutex_unlock(&dev->devlock); return ret; } /**************************************************************************** * Name: sps30_unlink ****************************************************************************/ #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS static int sps30_unlink(FAR struct inode *inode) { FAR struct sps30_dev_s *priv; int ret; DEBUGASSERT(inode->i_private != NULL); priv = inode->i_private; /* Get exclusive access */ ret = nxmutex_lock(&dev->devlock); if (ret < 0) { return ret; } /* Are there open references to the driver data structure? */ if (priv->crefs <= 0) { nxmutex_destroy(&priv->devlock); kmm_free(priv); return OK; } /* No... just mark the driver as unlinked and free the resources when * the last client closes their reference to the driver. */ priv->unlinked = true; nxmutex_unlock(&dev->devlock); return OK; } #endif /**************************************************************************** * Public Functions ****************************************************************************/ #ifdef CONFIG_SPS30_I2C /**************************************************************************** * Name: sps30_register_i2c * * Description: * Register the SPS30 character device as 'devpath' * * Input Parameters: * devpath - The full path to the driver to register e.g., "/dev/particle0" * i2c - An instance of the I2C interface to use to communicate with * the SPS30 * addr - The I2C address of the SPS30. The I2C address of SPS30 is * always 0x69. * * Returned Value: * Zero (OK) on success; a negated errno value on failure. * ****************************************************************************/ int sps30_register_i2c(FAR const char *devpath, FAR struct i2c_master_s *i2c, uint8_t addr) { FAR struct sps30_dev_s *priv; int ret; DEBUGASSERT(i2c != NULL); DEBUGASSERT(addr == CONFIG_SPS30_ADDR); DEBUGASSERT(sps30_crc_word(0xbeef) == 0x92); /* Initialize the device structure */ priv = kmm_zalloc(sizeof(struct sps30_dev_s)); if (priv == NULL) { sps30_dbg("ERROR: Failed to allocate instance\n"); return -ENOMEM; } priv->i2c = i2c; priv->addr = addr; priv->started = false; nxmutex_init(&priv->devlock); /* Register the character driver */ ret = register_driver(devpath, &g_sps30fops, 0666, priv); if (ret < 0) { sps30_dbg("ERROR: Failed to register driver: %d\n", ret); nxmutex_destroy(&priv->devlock); kmm_free(priv); } return ret; } #endif /* CONFIG_SPS30_I2C */ #endif /* CONFIG_SENSORS_SPS30 */