afa82fab5e
Since now we have irqchip helpers that the GPIO chip drivers are supposed to use if possible, we can move the registration of ACPI events to happen in these helpers. This seems to be more natural place and might encourage GPIO chip driver writers to take advantage of the irqchip helpers. We make the functions available to GPIO chip drivers via private gpiolib.h, just in case generic irqchip helpers are not suitable. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
153 lines
4.6 KiB
C
153 lines
4.6 KiB
C
/*
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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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