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- #ifndef _ASM_GENERIC_GPIO_H
- #define _ASM_GENERIC_GPIO_H
- #include <linux/kernel.h>
- #include <linux/types.h>
- #include <linux/errno.h>
- #include <linux/of.h>
- #ifdef CONFIG_GPIOLIB
- #include <linux/compiler.h>
- #include <linux/gpio/driver.h>
- #include <linux/gpio/consumer.h>
- /* Platforms may implement their GPIO interface with library code,
- * at a small performance cost for non-inlined operations and some
- * extra memory (for code and for per-GPIO table entries).
- *
- * While the GPIO programming interface defines valid GPIO numbers
- * to be in the range 0..MAX_INT, this library restricts them to the
- * smaller range 0..ARCH_NR_GPIOS-1.
- *
- * ARCH_NR_GPIOS is somewhat arbitrary; it usually reflects the sum of
- * builtin/SoC GPIOs plus a number of GPIOs on expanders; the latter is
- * actually an estimate of a board-specific value.
- */
- #ifndef ARCH_NR_GPIOS
- #if defined(CONFIG_ARCH_NR_GPIO) && CONFIG_ARCH_NR_GPIO > 0
- #define ARCH_NR_GPIOS CONFIG_ARCH_NR_GPIO
- #else
- #define ARCH_NR_GPIOS 512
- #endif
- #endif
- /*
- * "valid" GPIO numbers are nonnegative and may be passed to
- * setup routines like gpio_request(). only some valid numbers
- * can successfully be requested and used.
- *
- * Invalid GPIO numbers are useful for indicating no-such-GPIO in
- * platform data and other tables.
- */
- static inline bool gpio_is_valid(int number)
- {
- return number >= 0 && number < ARCH_NR_GPIOS;
- }
- struct device;
- struct gpio;
- struct seq_file;
- struct module;
- struct device_node;
- struct gpio_desc;
- /* caller holds gpio_lock *OR* gpio is marked as requested */
- static inline struct gpio_chip *gpio_to_chip(unsigned gpio)
- {
- return gpiod_to_chip(gpio_to_desc(gpio));
- }
- /* Always use the library code for GPIO management calls,
- * or when sleeping may be involved.
- */
- extern int gpio_request(unsigned gpio, const char *label);
- extern void gpio_free(unsigned gpio);
- static inline int gpio_direction_input(unsigned gpio)
- {
- return gpiod_direction_input(gpio_to_desc(gpio));
- }
- static inline int gpio_direction_output(unsigned gpio, int value)
- {
- return gpiod_direction_output_raw(gpio_to_desc(gpio), value);
- }
- static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
- {
- return gpiod_set_debounce(gpio_to_desc(gpio), debounce);
- }
- static inline int gpio_get_value_cansleep(unsigned gpio)
- {
- return gpiod_get_raw_value_cansleep(gpio_to_desc(gpio));
- }
- static inline void gpio_set_value_cansleep(unsigned gpio, int value)
- {
- return gpiod_set_raw_value_cansleep(gpio_to_desc(gpio), value);
- }
- /* A platform's <asm/gpio.h> code may want to inline the I/O calls when
- * the GPIO is constant and refers to some always-present controller,
- * giving direct access to chip registers and tight bitbanging loops.
- */
- static inline int __gpio_get_value(unsigned gpio)
- {
- return gpiod_get_raw_value(gpio_to_desc(gpio));
- }
- static inline void __gpio_set_value(unsigned gpio, int value)
- {
- return gpiod_set_raw_value(gpio_to_desc(gpio), value);
- }
- static inline int __gpio_cansleep(unsigned gpio)
- {
- return gpiod_cansleep(gpio_to_desc(gpio));
- }
- static inline int __gpio_to_irq(unsigned gpio)
- {
- return gpiod_to_irq(gpio_to_desc(gpio));
- }
- extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *label);
- extern int gpio_request_array(const struct gpio *array, size_t num);
- extern void gpio_free_array(const struct gpio *array, size_t num);
- /*
- * A sysfs interface can be exported by individual drivers if they want,
- * but more typically is configured entirely from userspace.
- */
- static inline int gpio_export(unsigned gpio, bool direction_may_change)
- {
- return gpiod_export(gpio_to_desc(gpio), direction_may_change);
- }
- static inline int gpio_export_link(struct device *dev, const char *name,
- unsigned gpio)
- {
- return gpiod_export_link(dev, name, gpio_to_desc(gpio));
- }
- static inline void gpio_unexport(unsigned gpio)
- {
- gpiod_unexport(gpio_to_desc(gpio));
- }
- #else /* !CONFIG_GPIOLIB */
- static inline bool gpio_is_valid(int number)
- {
- /* only non-negative numbers are valid */
- return number >= 0;
- }
- /* platforms that don't directly support access to GPIOs through I2C, SPI,
- * or other blocking infrastructure can use these wrappers.
- */
- static inline int gpio_cansleep(unsigned gpio)
- {
- return 0;
- }
- static inline int gpio_get_value_cansleep(unsigned gpio)
- {
- might_sleep();
- return __gpio_get_value(gpio);
- }
- static inline void gpio_set_value_cansleep(unsigned gpio, int value)
- {
- might_sleep();
- __gpio_set_value(gpio, value);
- }
- #endif /* !CONFIG_GPIOLIB */
- #endif /* _ASM_GENERIC_GPIO_H */
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