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153 lines
4.6 KiB
153 lines
4.6 KiB
/* |
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* Internal GPIO functions. |
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* |
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* Copyright (C) 2013, Intel Corporation |
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* Author: Mika Westerberg <mika.westerberg@linux.intel.com> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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*/ |
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#ifndef GPIOLIB_H |
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#define GPIOLIB_H |
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#include <linux/err.h> |
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#include <linux/device.h> |
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enum of_gpio_flags; |
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/** |
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* struct acpi_gpio_info - ACPI GPIO specific information |
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* @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo |
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* @active_low: in case of @gpioint, the pin is active low |
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*/ |
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struct acpi_gpio_info { |
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bool gpioint; |
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bool active_low; |
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}; |
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#ifdef CONFIG_ACPI |
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void acpi_gpiochip_add(struct gpio_chip *chip); |
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void acpi_gpiochip_remove(struct gpio_chip *chip); |
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void acpi_gpiochip_request_interrupts(struct gpio_chip *chip); |
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void acpi_gpiochip_free_interrupts(struct gpio_chip *chip); |
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struct gpio_desc *acpi_get_gpiod_by_index(struct device *dev, int index, |
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struct acpi_gpio_info *info); |
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#else |
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static inline void acpi_gpiochip_add(struct gpio_chip *chip) { } |
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static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { } |
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static inline void |
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acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { } |
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static inline void |
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acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { } |
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static inline struct gpio_desc * |
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acpi_get_gpiod_by_index(struct device *dev, int index, |
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struct acpi_gpio_info *info) |
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{ |
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return ERR_PTR(-ENOSYS); |
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} |
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#endif |
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struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np, |
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const char *list_name, int index, enum of_gpio_flags *flags); |
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struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum); |
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extern struct spinlock gpio_lock; |
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extern struct list_head gpio_chips; |
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struct gpio_desc { |
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struct gpio_chip *chip; |
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unsigned long flags; |
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/* flag symbols are bit numbers */ |
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#define FLAG_REQUESTED 0 |
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#define FLAG_IS_OUT 1 |
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#define FLAG_EXPORT 2 /* protected by sysfs_lock */ |
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#define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */ |
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#define FLAG_TRIG_FALL 4 /* trigger on falling edge */ |
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#define FLAG_TRIG_RISE 5 /* trigger on rising edge */ |
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#define FLAG_ACTIVE_LOW 6 /* value has active low */ |
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#define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */ |
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#define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */ |
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#define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */ |
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#define ID_SHIFT 16 /* add new flags before this one */ |
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#define GPIO_FLAGS_MASK ((1 << ID_SHIFT) - 1) |
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#define GPIO_TRIGGER_MASK (BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE)) |
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const char *label; |
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}; |
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int gpiod_request(struct gpio_desc *desc, const char *label); |
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void gpiod_free(struct gpio_desc *desc); |
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/* |
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* Return the GPIO number of the passed descriptor relative to its chip |
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*/ |
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static int __maybe_unused gpio_chip_hwgpio(const struct gpio_desc *desc) |
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{ |
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return desc - &desc->chip->desc[0]; |
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} |
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/* With descriptor prefix */ |
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#define gpiod_emerg(desc, fmt, ...) \ |
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pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\ |
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##__VA_ARGS__) |
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#define gpiod_crit(desc, fmt, ...) \ |
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pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ |
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##__VA_ARGS__) |
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#define gpiod_err(desc, fmt, ...) \ |
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pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ |
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##__VA_ARGS__) |
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#define gpiod_warn(desc, fmt, ...) \ |
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pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ |
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##__VA_ARGS__) |
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#define gpiod_info(desc, fmt, ...) \ |
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pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ |
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##__VA_ARGS__) |
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#define gpiod_dbg(desc, fmt, ...) \ |
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pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\ |
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##__VA_ARGS__) |
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/* With chip prefix */ |
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#define chip_emerg(chip, fmt, ...) \ |
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pr_emerg("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) |
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#define chip_crit(chip, fmt, ...) \ |
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pr_crit("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) |
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#define chip_err(chip, fmt, ...) \ |
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pr_err("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) |
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#define chip_warn(chip, fmt, ...) \ |
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pr_warn("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) |
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#define chip_info(chip, fmt, ...) \ |
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pr_info("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) |
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#define chip_dbg(chip, fmt, ...) \ |
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pr_debug("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) |
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#ifdef CONFIG_GPIO_SYSFS |
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int gpiochip_export(struct gpio_chip *chip); |
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void gpiochip_unexport(struct gpio_chip *chip); |
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#else |
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static inline int gpiochip_export(struct gpio_chip *chip) |
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{ |
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return 0; |
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} |
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static inline void gpiochip_unexport(struct gpio_chip *chip) |
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{ |
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} |
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#endif /* CONFIG_GPIO_SYSFS */ |
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#endif /* GPIOLIB_H */
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