// SPDX-License-Identifier: GPL-2.0-or-later /* * Hardware monitoring driver for UCD90xxx Sequencer and System Health * Controller series * * Copyright (C) 2011 Ericsson AB. */ #include <linux/debugfs.h> #include <linux/delay.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/init.h> #include <linux/err.h> #include <linux/slab.h> #include <linux/i2c.h> #include <linux/pmbus.h> #include <linux/gpio/driver.h> #include <linux/timekeeping.h> #include "pmbus.h" enum chips { … }; #define UCD9000_MONITOR_CONFIG … #define UCD9000_NUM_PAGES … #define UCD9000_FAN_CONFIG_INDEX … #define UCD9000_FAN_CONFIG … #define UCD9000_MFR_STATUS … #define UCD9000_GPIO_SELECT … #define UCD9000_GPIO_CONFIG … #define UCD9000_DEVICE_ID … /* GPIO CONFIG bits */ #define UCD9000_GPIO_CONFIG_ENABLE … #define UCD9000_GPIO_CONFIG_OUT_ENABLE … #define UCD9000_GPIO_CONFIG_OUT_VALUE … #define UCD9000_GPIO_CONFIG_STATUS … #define UCD9000_GPIO_INPUT … #define UCD9000_GPIO_OUTPUT … #define UCD9000_MON_TYPE(x) … #define UCD9000_MON_PAGE(x) … #define UCD9000_MON_VOLTAGE … #define UCD9000_MON_TEMPERATURE … #define UCD9000_MON_CURRENT … #define UCD9000_MON_VOLTAGE_HW … #define UCD9000_NUM_FAN … #define UCD9000_GPIO_NAME_LEN … #define UCD9090_NUM_GPIOS … #define UCD901XX_NUM_GPIOS … #define UCD90320_NUM_GPIOS … #define UCD90910_NUM_GPIOS … #define UCD9000_DEBUGFS_NAME_LEN … #define UCD9000_GPI_COUNT … #define UCD90320_GPI_COUNT … struct ucd9000_data { … }; #define to_ucd9000_data(_info) … struct ucd9000_debugfs_entry { … }; /* * It has been observed that the UCD90320 randomly fails register access when * doing another access right on the back of a register write. To mitigate this * make sure that there is a minimum delay between a write access and the * following access. The 500 is based on experimental data. At a delay of * 350us the issue seems to go away. Add a bit of extra margin to allow for * system to system differences. */ #define UCD90320_WAIT_DELAY_US … static inline void ucd90320_wait(const struct ucd9000_data *data) { … } static int ucd90320_read_word_data(struct i2c_client *client, int page, int phase, int reg) { … } static int ucd90320_read_byte_data(struct i2c_client *client, int page, int reg) { … } static int ucd90320_write_word_data(struct i2c_client *client, int page, int reg, u16 word) { … } static int ucd90320_write_byte(struct i2c_client *client, int page, u8 value) { … } static int ucd9000_get_fan_config(struct i2c_client *client, int fan) { … } static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg) { … } static const struct i2c_device_id ucd9000_id[] = …; MODULE_DEVICE_TABLE(i2c, ucd9000_id); static const struct of_device_id __maybe_unused ucd9000_of_match[] = …; MODULE_DEVICE_TABLE(of, ucd9000_of_match); #ifdef CONFIG_GPIOLIB static int ucd9000_gpio_read_config(struct i2c_client *client, unsigned int offset) { … } static int ucd9000_gpio_get(struct gpio_chip *gc, unsigned int offset) { … } static void ucd9000_gpio_set(struct gpio_chip *gc, unsigned int offset, int value) { … } static int ucd9000_gpio_get_direction(struct gpio_chip *gc, unsigned int offset) { … } static int ucd9000_gpio_set_direction(struct gpio_chip *gc, unsigned int offset, bool direction_out, int requested_out) { … } static int ucd9000_gpio_direction_input(struct gpio_chip *gc, unsigned int offset) { … } static int ucd9000_gpio_direction_output(struct gpio_chip *gc, unsigned int offset, int val) { … } static void ucd9000_probe_gpio(struct i2c_client *client, const struct i2c_device_id *mid, struct ucd9000_data *data) { … } #else static void ucd9000_probe_gpio(struct i2c_client *client, const struct i2c_device_id *mid, struct ucd9000_data *data) { } #endif /* CONFIG_GPIOLIB */ #ifdef CONFIG_DEBUG_FS static int ucd9000_get_mfr_status(struct i2c_client *client, u8 *buffer) { … } static int ucd9000_debugfs_show_mfr_status_bit(void *data, u64 *val) { … } DEFINE_DEBUGFS_ATTRIBUTE(…); static ssize_t ucd9000_debugfs_read_mfr_status(struct file *file, char __user *buf, size_t count, loff_t *ppos) { … } static const struct file_operations ucd9000_debugfs_show_mfr_status_fops = …; static int ucd9000_init_debugfs(struct i2c_client *client, const struct i2c_device_id *mid, struct ucd9000_data *data) { … } #else static int ucd9000_init_debugfs(struct i2c_client *client, const struct i2c_device_id *mid, struct ucd9000_data *data) { return 0; } #endif /* CONFIG_DEBUG_FS */ static int ucd9000_probe(struct i2c_client *client) { … } /* This is the driver that will be inserted */ static struct i2c_driver ucd9000_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_IMPORT_NS(…);
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