// SPDX-License-Identifier: GPL-2.0-or-later /* * lm83.c - Part of lm_sensors, Linux kernel modules for hardware * monitoring * Copyright (C) 2003-2009 Jean Delvare <[email protected]> * * Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is * a sensor chip made by National Semiconductor. It reports up to four * temperatures (its own plus up to three external ones) with a 1 deg * resolution and a 3-4 deg accuracy. Complete datasheet can be obtained * from National's website at: * http://www.national.com/pf/LM/LM83.html * Since the datasheet omits to give the chip stepping code, I give it * here: 0x03 (at register 0xff). * * Also supports the LM82 temp sensor, which is basically a stripped down * model of the LM83. Datasheet is here: * http://www.national.com/pf/LM/LM82.html */ #include <linux/bits.h> #include <linux/err.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/hwmon.h> #include <linux/module.h> #include <linux/regmap.h> #include <linux/slab.h> /* * Addresses to scan * Address is selected using 2 three-level pins, resulting in 9 possible * addresses. */ static const unsigned short normal_i2c[] = …; enum chips { … }; /* * The LM83 registers * Manufacturer ID is 0x01 for National Semiconductor. */ #define LM83_REG_R_MAN_ID … #define LM83_REG_R_CHIP_ID … #define LM83_REG_R_CONFIG … #define LM83_REG_W_CONFIG … #define LM83_REG_R_STATUS1 … #define LM83_REG_R_STATUS2 … #define LM83_REG_R_LOCAL_TEMP … #define LM83_REG_R_LOCAL_HIGH … #define LM83_REG_W_LOCAL_HIGH … #define LM83_REG_R_REMOTE1_TEMP … #define LM83_REG_R_REMOTE1_HIGH … #define LM83_REG_W_REMOTE1_HIGH … #define LM83_REG_R_REMOTE2_TEMP … #define LM83_REG_R_REMOTE2_HIGH … #define LM83_REG_W_REMOTE2_HIGH … #define LM83_REG_R_REMOTE3_TEMP … #define LM83_REG_R_REMOTE3_HIGH … #define LM83_REG_W_REMOTE3_HIGH … #define LM83_REG_R_TCRIT … #define LM83_REG_W_TCRIT … static const u8 LM83_REG_TEMP[] = …; static const u8 LM83_REG_MAX[] = …; /* alarm and fault registers and bits, indexed by channel */ static const u8 LM83_ALARM_REG[] = …; static const u8 LM83_MAX_ALARM_BIT[] = …; static const u8 LM83_CRIT_ALARM_BIT[] = …; static const u8 LM83_FAULT_BIT[] = …; /* * Client data (each client gets its own) */ struct lm83_data { … }; /* regmap code */ static int lm83_regmap_reg_read(void *context, unsigned int reg, unsigned int *val) { … } /* * The regmap write function maps read register addresses to write register * addresses. This is necessary for regmap register caching to work. * An alternative would be to clear the regmap cache whenever a register is * written, but that would be much more expensive. */ static int lm83_regmap_reg_write(void *context, unsigned int reg, unsigned int val) { … } static bool lm83_regmap_is_volatile(struct device *dev, unsigned int reg) { … } static const struct regmap_config lm83_regmap_config = …; /* hwmon API */ static int lm83_temp_read(struct device *dev, u32 attr, int channel, long *val) { … } static int lm83_temp_write(struct device *dev, u32 attr, int channel, long val) { … } static int lm83_chip_read(struct device *dev, u32 attr, int channel, long *val) { … } static int lm83_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { … } static int lm83_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long val) { … } static umode_t lm83_is_visible(const void *_data, enum hwmon_sensor_types type, u32 attr, int channel) { … } static const struct hwmon_channel_info * const lm83_info[] = …; static const struct hwmon_ops lm83_hwmon_ops = …; static const struct hwmon_chip_info lm83_chip_info = …; /* Return 0 if detection is successful, -ENODEV otherwise */ static int lm83_detect(struct i2c_client *client, struct i2c_board_info *info) { … } static int lm83_probe(struct i2c_client *client) { … } /* * Driver data (common to all clients) */ static const struct i2c_device_id lm83_id[] = …; MODULE_DEVICE_TABLE(i2c, lm83_id); static struct i2c_driver lm83_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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