// SPDX-License-Identifier: GPL-2.0-or-later /* * STTS751 sensor driver * * Copyright (C) 2016-2017 Istituto Italiano di Tecnologia - RBCS - EDL * Robotics, Brain and Cognitive Sciences department * Electronic Design Laboratory * * Written by Andrea Merello <[email protected]> * * Based on LM95241 driver and LM90 driver */ #include <linux/bitops.h> #include <linux/err.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/jiffies.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/property.h> #include <linux/slab.h> #include <linux/sysfs.h> #include <linux/util_macros.h> #define DEVNAME … static const unsigned short normal_i2c[] = …; #define STTS751_REG_TEMP_H … #define STTS751_REG_STATUS … #define STTS751_STATUS_TRIPT … #define STTS751_STATUS_TRIPL … #define STTS751_STATUS_TRIPH … #define STTS751_REG_TEMP_L … #define STTS751_REG_CONF … #define STTS751_CONF_RES_MASK … #define STTS751_CONF_RES_SHIFT … #define STTS751_CONF_EVENT_DIS … #define STTS751_CONF_STOP … #define STTS751_REG_RATE … #define STTS751_REG_HLIM_H … #define STTS751_REG_HLIM_L … #define STTS751_REG_LLIM_H … #define STTS751_REG_LLIM_L … #define STTS751_REG_TLIM … #define STTS751_REG_HYST … #define STTS751_REG_SMBUS_TO … #define STTS751_REG_PROD_ID … #define STTS751_REG_MAN_ID … #define STTS751_REG_REV_ID … #define STTS751_0_PROD_ID … #define STTS751_1_PROD_ID … #define ST_MAN_ID … /* * Possible update intervals are (in mS): * 16000, 8000, 4000, 2000, 1000, 500, 250, 125, 62.5, 31.25 * However we are not going to complicate things too much and we stick to the * approx value in mS. */ static const int stts751_intervals[] = …; static const struct i2c_device_id stts751_id[] = …; static const struct of_device_id __maybe_unused stts751_of_match[] = …; MODULE_DEVICE_TABLE(of, stts751_of_match); struct stts751_priv { … }; /* * These functions converts temperature from HW format to integer format and * vice-vers. They are (mostly) taken from lm90 driver. Unit is in mC. */ static int stts751_to_deg(s16 hw_val) { … } static s32 stts751_to_hw(int val) { … } static int stts751_adjust_resolution(struct stts751_priv *priv) { … } static int stts751_update_temp(struct stts751_priv *priv) { … } static int stts751_set_temp_reg16(struct stts751_priv *priv, int temp, u8 hreg, u8 lreg) { … } static int stts751_set_temp_reg8(struct stts751_priv *priv, int temp, u8 reg) { … } static int stts751_read_reg16(struct stts751_priv *priv, int *temp, u8 hreg, u8 lreg) { … } static int stts751_read_reg8(struct stts751_priv *priv, int *temp, u8 reg) { … } /* * Update alert flags without waiting for cache to expire. We detects alerts * immediately for the sake of the alert handler; we still need to deal with * caching to workaround the fact that alarm flags int the status register, * despite what the datasheet claims, gets always cleared on read. */ static int stts751_update_alert(struct stts751_priv *priv) { … } static void stts751_alert(struct i2c_client *client, enum i2c_alert_protocol type, unsigned int data) { … } static int stts751_update(struct stts751_priv *priv) { … } static ssize_t max_alarm_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t min_alarm_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t input_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t therm_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t therm_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static ssize_t hyst_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t hyst_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static ssize_t therm_trip_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t max_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t max_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static ssize_t min_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t min_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static ssize_t interval_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t interval_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static int stts751_detect(struct i2c_client *new_client, struct i2c_board_info *info) { … } static int stts751_read_chip_config(struct stts751_priv *priv) { … } static SENSOR_DEVICE_ATTR_RO(temp1_input, input, 0); static SENSOR_DEVICE_ATTR_RW(temp1_min, min, 0); static SENSOR_DEVICE_ATTR_RW(temp1_max, max, 0); static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, min_alarm, 0); static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, max_alarm, 0); static SENSOR_DEVICE_ATTR_RW(temp1_crit, therm, 0); static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, hyst, 0); static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, therm_trip, 0); static SENSOR_DEVICE_ATTR_RW(update_interval, interval, 0); static struct attribute *stts751_attrs[] = …; ATTRIBUTE_GROUPS(…); static int stts751_probe(struct i2c_client *client) { … } MODULE_DEVICE_TABLE(i2c, stts751_id); static struct i2c_driver stts751_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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