/* SPDX-License-Identifier: GPL-2.0 */ /* * Internal GPIO functions. * * Copyright (C) 2013, Intel Corporation * Author: Mika Westerberg */ #ifndef GPIOLIB_H #define GPIOLIB_H #include #include /* for enum gpiod_flags */ #include #include #include #include #include #define GPIOCHIP_NAME "gpiochip" /** * struct gpio_device - internal state container for GPIO devices * @id: numerical ID number for the GPIO chip * @dev: the GPIO device struct * @chrdev: character device for the GPIO device * @mockdev: class device used by the deprecated sysfs interface (may be * NULL) * @owner: helps prevent removal of modules exporting active GPIOs * @chip: pointer to the corresponding gpiochip, holding static * data for this device * @descs: array of ngpio descriptors. * @ngpio: the number of GPIO lines on this GPIO device, equal to the size * of the @descs array. * @base: GPIO base in the DEPRECATED global Linux GPIO numberspace, assigned * at device creation time. * @label: a descriptive name for the GPIO device, such as the part number * or name of the IP component in a System on Chip. * @data: per-instance data assigned by the driver * @list: links gpio_device:s together for traversal * @notifier: used to notify subscribers about lines being requested, released * or reconfigured * @sem: protects the structure from a NULL-pointer dereference of @chip by * user-space operations when the device gets unregistered during * a hot-unplug event * @pin_ranges: range of pins served by the GPIO driver * * This state container holds most of the runtime variable data * for a GPIO device and can hold references and live on after the * GPIO chip has been removed, if it is still being used from * userspace. */ struct gpio_device { int id; struct device dev; struct cdev chrdev; struct device *mockdev; struct module *owner; struct gpio_chip *chip; struct gpio_desc *descs; int base; u16 ngpio; const char *label; void *data; struct list_head list; struct blocking_notifier_head notifier; struct rw_semaphore sem; #ifdef CONFIG_PINCTRL /* * If CONFIG_PINCTRL is enabled, then gpio controllers can optionally * describe the actual pin range which they serve in an SoC. This * information would be used by pinctrl subsystem to configure * corresponding pins for gpio usage. */ struct list_head pin_ranges; #endif }; /* gpio suffixes used for ACPI and device tree lookup */ static __maybe_unused const char * const gpio_suffixes[] = { "gpios", "gpio" }; /** * struct gpio_array - Opaque descriptor for a structure of GPIO array attributes * * @desc: Array of pointers to the GPIO descriptors * @size: Number of elements in desc * @chip: Parent GPIO chip * @get_mask: Get mask used in fastpath * @set_mask: Set mask used in fastpath * @invert_mask: Invert mask used in fastpath * * This structure is attached to struct gpiod_descs obtained from * gpiod_get_array() and can be passed back to get/set array functions in order * to activate fast processing path if applicable. */ struct gpio_array { struct gpio_desc **desc; unsigned int size; struct gpio_chip *chip; unsigned long *get_mask; unsigned long *set_mask; unsigned long invert_mask[]; }; struct gpio_desc *gpiochip_get_desc(struct gpio_chip *gc, unsigned int hwnum); int gpiod_get_array_value_complex(bool raw, bool can_sleep, unsigned int array_size, struct gpio_desc **desc_array, struct gpio_array *array_info, unsigned long *value_bitmap); int gpiod_set_array_value_complex(bool raw, bool can_sleep, unsigned int array_size, struct gpio_desc **desc_array, struct gpio_array *array_info, unsigned long *value_bitmap); extern spinlock_t gpio_lock; extern struct list_head gpio_devices; /** * struct gpio_desc - Opaque descriptor for a GPIO * * @gdev: Pointer to the parent GPIO device * @flags: Binary descriptor flags * @label: Name of the consumer * @name: Line name * @hog: Pointer to the device node that hogs this line (if any) * @debounce_period_us: Debounce period in microseconds * * These are obtained using gpiod_get() and are preferable to the old * integer-based handles. * * Contrary to integers, a pointer to a &struct gpio_desc is guaranteed to be * valid until the GPIO is released. */ struct gpio_desc { struct gpio_device *gdev; unsigned long flags; /* flag symbols are bit numbers */ #define FLAG_REQUESTED 0 #define FLAG_IS_OUT 1 #define FLAG_EXPORT 2 /* protected by sysfs_lock */ #define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */ #define FLAG_ACTIVE_LOW 6 /* value has active low */ #define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */ #define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */ #define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */ #define FLAG_IRQ_IS_ENABLED 10 /* GPIO is connected to an enabled IRQ */ #define FLAG_IS_HOGGED 11 /* GPIO is hogged */ #define FLAG_TRANSITORY 12 /* GPIO may lose value in sleep or reset */ #define FLAG_PULL_UP 13 /* GPIO has pull up enabled */ #define FLAG_PULL_DOWN 14 /* GPIO has pull down enabled */ #define FLAG_BIAS_DISABLE 15 /* GPIO has pull disabled */ #define FLAG_EDGE_RISING 16 /* GPIO CDEV detects rising edge events */ #define FLAG_EDGE_FALLING 17 /* GPIO CDEV detects falling edge events */ #define FLAG_EVENT_CLOCK_REALTIME 18 /* GPIO CDEV reports REALTIME timestamps in events */ /* Connection label */ const char *label; /* Name of the GPIO */ const char *name; #ifdef CONFIG_OF_DYNAMIC struct device_node *hog; #endif #ifdef CONFIG_GPIO_CDEV /* debounce period in microseconds */ unsigned int debounce_period_us; #endif }; #define gpiod_not_found(desc) (IS_ERR(desc) && PTR_ERR(desc) == -ENOENT) int gpiod_request(struct gpio_desc *desc, const char *label); void gpiod_free(struct gpio_desc *desc); static inline int gpiod_request_user(struct gpio_desc *desc, const char *label) { int ret; ret = gpiod_request(desc, label); if (ret == -EPROBE_DEFER) ret = -ENODEV; return ret; } int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, unsigned long lflags, enum gpiod_flags dflags); int gpio_set_debounce_timeout(struct gpio_desc *desc, unsigned int debounce); int gpiod_hog(struct gpio_desc *desc, const char *name, unsigned long lflags, enum gpiod_flags dflags); /* * Return the GPIO number of the passed descriptor relative to its chip */ static inline int gpio_chip_hwgpio(const struct gpio_desc *desc) { return desc - &desc->gdev->descs[0]; } /* With descriptor prefix */ #define gpiod_emerg(desc, fmt, ...) \ pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\ ##__VA_ARGS__) #define gpiod_crit(desc, fmt, ...) \ pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ ##__VA_ARGS__) #define gpiod_err(desc, fmt, ...) \ pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ ##__VA_ARGS__) #define gpiod_warn(desc, fmt, ...) \ pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ ##__VA_ARGS__) #define gpiod_info(desc, fmt, ...) \ pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ ##__VA_ARGS__) #define gpiod_dbg(desc, fmt, ...) \ pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\ ##__VA_ARGS__) /* With chip prefix */ #define chip_emerg(gc, fmt, ...) \ dev_emerg(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__) #define chip_crit(gc, fmt, ...) \ dev_crit(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__) #define chip_err(gc, fmt, ...) \ dev_err(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__) #define chip_warn(gc, fmt, ...) \ dev_warn(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__) #define chip_info(gc, fmt, ...) \ dev_info(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__) #define chip_dbg(gc, fmt, ...) \ dev_dbg(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__) #endif /* GPIOLIB_H */