// SPDX-License-Identifier: GPL-2.0-or-later /* Sensirion SHT3x-DIS humidity and temperature sensor driver. * The SHT3x comes in many different versions, this driver is for the * I2C version only. * * Copyright (C) 2016 Sensirion AG, Switzerland * Author: David Frey <[email protected]> * Author: Pascal Sachs <[email protected]> */ #include <asm/page.h> #include <linux/crc8.h> #include <linux/debugfs.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/jiffies.h> /* commands (high repeatability mode) */ static const unsigned char sht3x_cmd_measure_single_hpm[] = …; /* commands (medium repeatability mode) */ static const unsigned char sht3x_cmd_measure_single_mpm[] = …; /* commands (low repeatability mode) */ static const unsigned char sht3x_cmd_measure_single_lpm[] = …; /* commands for periodic mode */ static const unsigned char sht3x_cmd_measure_periodic_mode[] = …; static const unsigned char sht3x_cmd_break[] = …; /* commands for heater control */ static const unsigned char sht3x_cmd_heater_on[] = …; static const unsigned char sht3x_cmd_heater_off[] = …; /* other commands */ static const unsigned char sht3x_cmd_read_status_reg[] = …; static const unsigned char sht3x_cmd_clear_status_reg[] = …; static const unsigned char sht3x_cmd_read_serial_number[] = …; static struct dentry *debugfs; /* delays for single-shot mode i2c commands, both in us */ #define SHT3X_SINGLE_WAIT_TIME_HPM … #define SHT3X_SINGLE_WAIT_TIME_MPM … #define SHT3X_SINGLE_WAIT_TIME_LPM … #define SHT3X_WORD_LEN … #define SHT3X_CMD_LENGTH … #define SHT3X_CRC8_LEN … #define SHT3X_RESPONSE_LENGTH … #define SHT3X_CRC8_POLYNOMIAL … #define SHT3X_CRC8_INIT … #define SHT3X_MIN_TEMPERATURE … #define SHT3X_MAX_TEMPERATURE … #define SHT3X_MIN_HUMIDITY … #define SHT3X_MAX_HUMIDITY … enum sht3x_chips { … }; enum sht3x_limits { … }; enum sht3x_repeatability { … }; DECLARE_CRC8_TABLE(sht3x_crc8_table); /* periodic measure commands (high repeatability mode) */ static const char periodic_measure_commands_hpm[][SHT3X_CMD_LENGTH] = …; /* periodic measure commands (medium repeatability) */ static const char periodic_measure_commands_mpm[][SHT3X_CMD_LENGTH] = …; /* periodic measure commands (low repeatability mode) */ static const char periodic_measure_commands_lpm[][SHT3X_CMD_LENGTH] = …; struct sht3x_limit_commands { … }; static const struct sht3x_limit_commands limit_commands[] = …; #define SHT3X_NUM_LIMIT_CMD … static const u16 mode_to_update_interval[] = …; static const struct hwmon_channel_info * const sht3x_channel_info[] = …; struct sht3x_data { … }; static u8 get_mode_from_update_interval(u16 value) { … } static int sht3x_read_from_command(struct i2c_client *client, struct sht3x_data *data, const char *command, char *buf, int length, u32 wait_time) { … } static int sht3x_extract_temperature(u16 raw) { … } static u32 sht3x_extract_humidity(u16 raw) { … } static struct sht3x_data *sht3x_update_client(struct device *dev) { … } static int temp1_input_read(struct device *dev) { … } static int humidity1_input_read(struct device *dev) { … } /* * limits_update must only be called from probe or with data_lock held */ static int limits_update(struct sht3x_data *data) { … } static int temp1_limit_read(struct device *dev, int index) { … } static int humidity1_limit_read(struct device *dev, int index) { … } /* * limit_write must only be called with data_lock held */ static size_t limit_write(struct device *dev, u8 index, int temperature, u32 humidity) { … } static int temp1_limit_write(struct device *dev, int index, int val) { … } static int humidity1_limit_write(struct device *dev, int index, int val) { … } static void sht3x_select_command(struct sht3x_data *data) { … } static int status_register_read(struct device *dev, char *buffer, int length) { … } static int temp1_alarm_read(struct device *dev) { … } static int humidity1_alarm_read(struct device *dev) { … } static ssize_t heater_enable_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t heater_enable_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static int update_interval_read(struct device *dev) { … } static int update_interval_write(struct device *dev, int val) { … } static ssize_t repeatability_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t repeatability_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static SENSOR_DEVICE_ATTR_RW(heater_enable, heater_enable, 0); static SENSOR_DEVICE_ATTR_RW(repeatability, repeatability, 0); static struct attribute *sht3x_attrs[] = …; ATTRIBUTE_GROUPS(…); static umode_t sht3x_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, int channel) { … } static int sht3x_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { … } static int sht3x_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long val) { … } static void sht3x_debugfs_init(struct sht3x_data *data) { … } static void sht3x_debugfs_remove(void *sensor_dir) { … } static int sht3x_serial_number_read(struct sht3x_data *data) { … } static const struct hwmon_ops sht3x_ops = …; static const struct hwmon_chip_info sht3x_chip_info = …; static int sht3x_probe(struct i2c_client *client) { … } /* device ID table */ static const struct i2c_device_id sht3x_ids[] = …; MODULE_DEVICE_TABLE(i2c, sht3x_ids); static struct i2c_driver sht3x_i2c_driver = …; static int __init sht3x_init(void) { … } module_init(…) …; static void __exit sht3x_cleanup(void) { … } module_exit(sht3x_cleanup); MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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