// SPDX-License-Identifier: GPL-2.0-or-later /* * Driver for Jedec 5118 compliant temperature sensors * * Derived from https://github.com/Steve-Tech/SPD5118-DKMS * Originally from T/2 driver at https://t2sde.org/packages/linux * Copyright (c) 2023 René Rebe, ExactCODE GmbH; Germany. * * Copyright (c) 2024 Guenter Roeck * * Inspired by ee1004.c and jc42.c. * * SPD5118 compliant temperature sensors are typically used on DDR5 * memory modules. */ #include <linux/bitops.h> #include <linux/bits.h> #include <linux/err.h> #include <linux/i2c.h> #include <linux/hwmon.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/nvmem-provider.h> #include <linux/pm.h> #include <linux/regmap.h> #include <linux/units.h> /* Addresses to scan */ static const unsigned short normal_i2c[] = …; /* SPD5118 registers. */ #define SPD5118_REG_TYPE … #define SPD5118_REG_REVISION … #define SPD5118_REG_VENDOR … #define SPD5118_REG_CAPABILITY … #define SPD5118_REG_I2C_LEGACY_MODE … #define SPD5118_REG_TEMP_CLR … #define SPD5118_REG_ERROR_CLR … #define SPD5118_REG_TEMP_CONFIG … #define SPD5118_REG_TEMP_MAX … #define SPD5118_REG_TEMP_MIN … #define SPD5118_REG_TEMP_CRIT … #define SPD5118_REG_TEMP_LCRIT … #define SPD5118_REG_TEMP … #define SPD5118_REG_TEMP_STATUS … #define SPD5118_TEMP_STATUS_HIGH … #define SPD5118_TEMP_STATUS_LOW … #define SPD5118_TEMP_STATUS_CRIT … #define SPD5118_TEMP_STATUS_LCRIT … #define SPD5118_CAP_TS_SUPPORT … #define SPD5118_TS_DISABLE … #define SPD5118_LEGACY_MODE_ADDR … #define SPD5118_LEGACY_PAGE_MASK … #define SPD5118_LEGACY_MODE_MASK … #define SPD5118_NUM_PAGES … #define SPD5118_PAGE_SIZE … #define SPD5118_PAGE_SHIFT … #define SPD5118_PAGE_MASK … #define SPD5118_EEPROM_BASE … #define SPD5118_EEPROM_SIZE … /* Temperature unit in millicelsius */ #define SPD5118_TEMP_UNIT … /* Representable temperature range in millicelsius */ #define SPD5118_TEMP_RANGE_MIN … #define SPD5118_TEMP_RANGE_MAX … struct spd5118_data { … }; /* hwmon */ static int spd5118_temp_from_reg(u16 reg) { … } static u16 spd5118_temp_to_reg(long temp) { … } static int spd5118_read_temp(struct regmap *regmap, u32 attr, long *val) { … } static int spd5118_read_alarm(struct regmap *regmap, u32 attr, long *val) { … } static int spd5118_read_enable(struct regmap *regmap, long *val) { … } static int spd5118_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { … } static int spd5118_write_temp(struct regmap *regmap, u32 attr, long val) { … } static int spd5118_write_enable(struct regmap *regmap, long val) { … } static int spd5118_temp_write(struct regmap *regmap, u32 attr, long val) { … } static int spd5118_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long val) { … } static umode_t spd5118_is_visible(const void *_data, enum hwmon_sensor_types type, u32 attr, int channel) { … } static inline bool spd5118_parity8(u8 w) { … } /* * Bank and vendor id are 8-bit fields with seven data bits and odd parity. * Vendor IDs 0 and 0x7f are invalid. * See Jedec standard JEP106BJ for details and a list of assigned vendor IDs. */ static bool spd5118_vendor_valid(u8 bank, u8 id) { … } /* Return 0 if detection is successful, -ENODEV otherwise */ static int spd5118_detect(struct i2c_client *client, struct i2c_board_info *info) { … } static const struct hwmon_channel_info *spd5118_info[] = …; static const struct hwmon_ops spd5118_hwmon_ops = …; static const struct hwmon_chip_info spd5118_chip_info = …; /* nvmem */ static ssize_t spd5118_nvmem_read_page(struct regmap *regmap, char *buf, unsigned int offset, size_t count) { … } static int spd5118_nvmem_read(void *priv, unsigned int off, void *val, size_t count) { … } static int spd5118_nvmem_init(struct device *dev, struct spd5118_data *data) { … } /* regmap */ static bool spd5118_writeable_reg(struct device *dev, unsigned int reg) { … } static bool spd5118_volatile_reg(struct device *dev, unsigned int reg) { … } static const struct regmap_range_cfg spd5118_regmap_range_cfg[] = …; static const struct regmap_config spd5118_regmap_config = …; static int spd5118_init(struct i2c_client *client) { … } static int spd5118_probe(struct i2c_client *client) { … } static int spd5118_suspend(struct device *dev) { … } static int spd5118_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(spd5118_pm_ops, spd5118_suspend, spd5118_resume); static const struct i2c_device_id spd5118_id[] = …; MODULE_DEVICE_TABLE(i2c, spd5118_id); static const struct of_device_id spd5118_of_ids[] = …; MODULE_DEVICE_TABLE(of, spd5118_of_ids); static struct i2c_driver spd5118_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
Codebase Browser
linux