// SPDX-License-Identifier: GPL-2.0-only /* * GPIO interface for IT87xx Super I/O chips * * Author: Diego Elio Pettenò <[email protected]> * Copyright (c) 2017 Google, Inc. * * Based on it87_wdt.c by Oliver Schuster * gpio-it8761e.c by Denis Turischev * gpio-stmpe.c by Rabin Vincent */ #define pr_fmt(fmt) … #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/io.h> #include <linux/errno.h> #include <linux/ioport.h> #include <linux/slab.h> #include <linux/gpio/driver.h> /* Chip Id numbers */ #define NO_DEV_ID … #define IT8613_ID … #define IT8620_ID … #define IT8628_ID … #define IT8718_ID … #define IT8728_ID … #define IT8732_ID … #define IT8761_ID … #define IT8772_ID … #define IT8786_ID … /* IO Ports */ #define REG … #define VAL … /* Logical device Numbers LDN */ #define GPIO … /* Configuration Registers and Functions */ #define LDNREG … #define CHIPID … #define CHIPREV … /** * struct it87_gpio - it87-specific GPIO chip * @chip: the underlying gpio_chip structure * @lock: a lock to avoid races between operations * @io_base: base address for gpio ports * @io_size: size of the port rage starting from io_base. * @output_base: Super I/O register address for Output Enable register * @simple_base: Super I/O 'Simple I/O' Enable register * @simple_size: Super IO 'Simple I/O' Enable register size; this is * required because IT87xx chips might only provide Simple I/O * switches on a subset of lines, whereas the others keep the * same status all time. */ struct it87_gpio { … }; static struct it87_gpio it87_gpio_chip = …; /* Superio chip access functions; copied from wdt_it87 */ static inline int superio_enter(void) { … } static inline void superio_exit(void) { … } static inline void superio_select(int ldn) { … } static inline int superio_inb(int reg) { … } static inline void superio_outb(int val, int reg) { … } static inline int superio_inw(int reg) { … } static inline void superio_set_mask(int mask, int reg) { … } static inline void superio_clear_mask(int mask, int reg) { … } static int it87_gpio_request(struct gpio_chip *chip, unsigned gpio_num) { … } static int it87_gpio_get(struct gpio_chip *chip, unsigned gpio_num) { … } static int it87_gpio_direction_in(struct gpio_chip *chip, unsigned gpio_num) { … } static void it87_gpio_set(struct gpio_chip *chip, unsigned gpio_num, int val) { … } static int it87_gpio_direction_out(struct gpio_chip *chip, unsigned gpio_num, int val) { … } static const struct gpio_chip it87_template_chip = …; static int __init it87_gpio_init(void) { … } static void __exit it87_gpio_exit(void) { … } module_init(…) …; module_exit(it87_gpio_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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