// SPDX-License-Identifier: GPL-2.0-or-later /* * ds1621.c - Part of lm_sensors, Linux kernel modules for hardware * monitoring * Christian W. Zuckschwerdt <[email protected]> 2000-11-23 * based on lm75.c by Frodo Looijaard <[email protected]> * Ported to Linux 2.6 by Aurelien Jarno <[email protected]> with * the help of Jean Delvare <[email protected]> * * The DS1621 device is a digital temperature/thermometer with 9-bit * resolution, a thermal alarm output (Tout), and user-defined minimum * and maximum temperature thresholds (TH and TL). * * The DS1625, DS1631, DS1721, and DS1731 are pin compatible with the DS1621 * and similar in operation, with slight variations as noted in the device * datasheets (please refer to www.maximintegrated.com for specific * device information). * * Since the DS1621 was the first chipset supported by this driver, * most comments will refer to this chipset, but are actually general * and concern all supported chipsets, unless mentioned otherwise. */ #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/jiffies.h> #include <linux/i2c.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/err.h> #include <linux/mutex.h> #include <linux/sysfs.h> #include <linux/kernel.h> /* Supported devices */ enum chips { … }; /* Insmod parameters */ static int polarity = …; module_param(polarity, int, 0); MODULE_PARM_DESC(…) …; /* * The Configuration/Status register * * - DS1621: * 7 6 5 4 3 2 1 0 * |Done|THF |TLF |NVB | X | X |POL |1SHOT| * * - DS1625: * 7 6 5 4 3 2 1 0 * |Done|THF |TLF |NVB | 1 | 0 |POL |1SHOT| * * - DS1631, DS1731: * 7 6 5 4 3 2 1 0 * |Done|THF |TLF |NVB | R1 | R0 |POL |1SHOT| * * - DS1721: * 7 6 5 4 3 2 1 0 * |Done| X | X | U | R1 | R0 |POL |1SHOT| * * Where: * - 'X' is Reserved * - 'U' is Undefined */ #define DS1621_REG_CONFIG_NVB … #define DS1621_REG_CONFIG_RESOL … #define DS1621_REG_CONFIG_POLARITY … #define DS1621_REG_CONFIG_1SHOT … #define DS1621_REG_CONFIG_DONE … #define DS1621_REG_CONFIG_RESOL_SHIFT … /* ds1721 conversion rates: {C/LSB, time(ms), resolution bit setting} */ static const unsigned short ds1721_convrates[] = …; #define DS1621_CONVERSION_MAX … #define DS1625_CONVERSION_MAX … #define DS1621_TEMP_MAX … #define DS1621_TEMP_MIN … /* The DS1621 temperature registers */ static const u8 DS1621_REG_TEMP[3] = …; #define DS1621_REG_CONF … #define DS1621_COM_START … #define DS1721_COM_START … #define DS1621_COM_STOP … /* The DS1621 configuration register */ #define DS1621_ALARM_TEMP_HIGH … #define DS1621_ALARM_TEMP_LOW … /* Conversions */ #define ALARMS_FROM_REG(val) … /* Each client has this additional data */ struct ds1621_data { … }; static inline int DS1621_TEMP_FROM_REG(u16 reg) { … } /* * TEMP: 0.001C/bit (-55C to +125C) * REG: * - 1621, 1625: 0.5C/bit, 7 zero-bits * - 1631, 1721, 1731: 0.0625C/bit, 4 zero-bits */ static inline u16 DS1621_TEMP_TO_REG(long temp, u8 zbits) { … } static void ds1621_init_client(struct ds1621_data *data, struct i2c_client *client) { … } static struct ds1621_data *ds1621_update_client(struct device *dev) { … } static ssize_t temp_show(struct device *dev, struct device_attribute *da, char *buf) { … } static ssize_t temp_store(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { … } static ssize_t alarms_show(struct device *dev, struct device_attribute *da, char *buf) { … } static ssize_t alarm_show(struct device *dev, struct device_attribute *da, char *buf) { … } static ssize_t update_interval_show(struct device *dev, struct device_attribute *da, char *buf) { … } static ssize_t update_interval_store(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { … } static DEVICE_ATTR_RO(alarms); static DEVICE_ATTR_RW(update_interval); static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0); static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, 1); static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 2); static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, alarm, DS1621_ALARM_TEMP_LOW); static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, DS1621_ALARM_TEMP_HIGH); static struct attribute *ds1621_attributes[] = …; static umode_t ds1621_attribute_visible(struct kobject *kobj, struct attribute *attr, int index) { … } static const struct attribute_group ds1621_group = …; __ATTRIBUTE_GROUPS(…); static int ds1621_probe(struct i2c_client *client) { … } static const struct i2c_device_id ds1621_id[] = …; MODULE_DEVICE_TABLE(i2c, ds1621_id); /* This is the driver that will be inserted */ static struct i2c_driver ds1621_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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