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250 lines
5.3 KiB
250 lines
5.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* <linux/gpio.h> |
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* |
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* This is the LEGACY GPIO bulk include file, including legacy APIs. It is |
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* used for GPIO drivers still referencing the global GPIO numberspace, |
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* and should not be included in new code. |
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* |
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* If you're implementing a GPIO driver, only include <linux/gpio/driver.h> |
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* If you're implementing a GPIO consumer, only include <linux/gpio/consumer.h> |
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*/ |
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#ifndef __LINUX_GPIO_H |
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#define __LINUX_GPIO_H |
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#include <linux/errno.h> |
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/* see Documentation/driver-api/gpio/legacy.rst */ |
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/* make these flag values available regardless of GPIO kconfig options */ |
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#define GPIOF_DIR_OUT (0 << 0) |
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#define GPIOF_DIR_IN (1 << 0) |
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#define GPIOF_INIT_LOW (0 << 1) |
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#define GPIOF_INIT_HIGH (1 << 1) |
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#define GPIOF_IN (GPIOF_DIR_IN) |
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#define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT | GPIOF_INIT_LOW) |
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#define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT | GPIOF_INIT_HIGH) |
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/* Gpio pin is active-low */ |
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#define GPIOF_ACTIVE_LOW (1 << 2) |
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/* Gpio pin is open drain */ |
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#define GPIOF_OPEN_DRAIN (1 << 3) |
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/* Gpio pin is open source */ |
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#define GPIOF_OPEN_SOURCE (1 << 4) |
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#define GPIOF_EXPORT (1 << 5) |
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#define GPIOF_EXPORT_CHANGEABLE (1 << 6) |
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#define GPIOF_EXPORT_DIR_FIXED (GPIOF_EXPORT) |
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#define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE) |
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/** |
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* struct gpio - a structure describing a GPIO with configuration |
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* @gpio: the GPIO number |
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* @flags: GPIO configuration as specified by GPIOF_* |
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* @label: a literal description string of this GPIO |
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*/ |
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struct gpio { |
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unsigned gpio; |
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unsigned long flags; |
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const char *label; |
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}; |
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#ifdef CONFIG_GPIOLIB |
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#ifdef CONFIG_ARCH_HAVE_CUSTOM_GPIO_H |
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#include <asm/gpio.h> |
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#else |
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#include <asm-generic/gpio.h> |
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static inline int gpio_get_value(unsigned int gpio) |
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{ |
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return __gpio_get_value(gpio); |
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} |
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static inline void gpio_set_value(unsigned int gpio, int value) |
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{ |
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__gpio_set_value(gpio, value); |
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} |
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static inline int gpio_cansleep(unsigned int gpio) |
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{ |
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return __gpio_cansleep(gpio); |
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} |
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static inline int gpio_to_irq(unsigned int gpio) |
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{ |
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return __gpio_to_irq(gpio); |
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} |
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static inline int irq_to_gpio(unsigned int irq) |
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{ |
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return -EINVAL; |
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} |
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#endif /* ! CONFIG_ARCH_HAVE_CUSTOM_GPIO_H */ |
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/* CONFIG_GPIOLIB: bindings for managed devices that want to request gpios */ |
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struct device; |
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int devm_gpio_request(struct device *dev, unsigned gpio, const char *label); |
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int devm_gpio_request_one(struct device *dev, unsigned gpio, |
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unsigned long flags, const char *label); |
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void devm_gpio_free(struct device *dev, unsigned int gpio); |
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#else /* ! CONFIG_GPIOLIB */ |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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#include <linux/bug.h> |
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struct device; |
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struct gpio_chip; |
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static inline bool gpio_is_valid(int number) |
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{ |
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return false; |
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} |
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static inline int gpio_request(unsigned gpio, const char *label) |
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{ |
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return -ENOSYS; |
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} |
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static inline int gpio_request_one(unsigned gpio, |
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unsigned long flags, const char *label) |
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{ |
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return -ENOSYS; |
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} |
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static inline int gpio_request_array(const struct gpio *array, size_t num) |
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{ |
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return -ENOSYS; |
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} |
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static inline void gpio_free(unsigned gpio) |
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{ |
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might_sleep(); |
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/* GPIO can never have been requested */ |
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WARN_ON(1); |
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} |
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static inline void gpio_free_array(const struct gpio *array, size_t num) |
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{ |
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might_sleep(); |
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/* GPIO can never have been requested */ |
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WARN_ON(1); |
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} |
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static inline int gpio_direction_input(unsigned gpio) |
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{ |
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return -ENOSYS; |
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} |
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static inline int gpio_direction_output(unsigned gpio, int value) |
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{ |
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return -ENOSYS; |
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} |
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static inline int gpio_set_debounce(unsigned gpio, unsigned debounce) |
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{ |
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return -ENOSYS; |
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} |
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static inline int gpio_get_value(unsigned gpio) |
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{ |
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/* GPIO can never have been requested or set as {in,out}put */ |
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WARN_ON(1); |
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return 0; |
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} |
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static inline void gpio_set_value(unsigned gpio, int value) |
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{ |
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/* GPIO can never have been requested or set as output */ |
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WARN_ON(1); |
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} |
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static inline int gpio_cansleep(unsigned gpio) |
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{ |
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/* GPIO can never have been requested or set as {in,out}put */ |
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WARN_ON(1); |
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return 0; |
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} |
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static inline int gpio_get_value_cansleep(unsigned gpio) |
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{ |
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/* GPIO can never have been requested or set as {in,out}put */ |
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WARN_ON(1); |
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return 0; |
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} |
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static inline void gpio_set_value_cansleep(unsigned gpio, int value) |
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{ |
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/* GPIO can never have been requested or set as output */ |
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WARN_ON(1); |
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} |
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static inline int gpio_export(unsigned gpio, bool direction_may_change) |
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{ |
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/* GPIO can never have been requested or set as {in,out}put */ |
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WARN_ON(1); |
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return -EINVAL; |
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} |
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static inline int gpio_export_link(struct device *dev, const char *name, |
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unsigned gpio) |
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{ |
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/* GPIO can never have been exported */ |
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WARN_ON(1); |
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return -EINVAL; |
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} |
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static inline void gpio_unexport(unsigned gpio) |
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{ |
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/* GPIO can never have been exported */ |
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WARN_ON(1); |
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} |
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static inline int gpio_to_irq(unsigned gpio) |
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{ |
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/* GPIO can never have been requested or set as input */ |
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WARN_ON(1); |
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return -EINVAL; |
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} |
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static inline int irq_to_gpio(unsigned irq) |
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{ |
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/* irq can never have been returned from gpio_to_irq() */ |
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WARN_ON(1); |
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return -EINVAL; |
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} |
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static inline int devm_gpio_request(struct device *dev, unsigned gpio, |
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const char *label) |
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{ |
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WARN_ON(1); |
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return -EINVAL; |
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} |
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static inline int devm_gpio_request_one(struct device *dev, unsigned gpio, |
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unsigned long flags, const char *label) |
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{ |
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WARN_ON(1); |
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return -EINVAL; |
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} |
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static inline void devm_gpio_free(struct device *dev, unsigned int gpio) |
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{ |
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WARN_ON(1); |
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} |
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#endif /* ! CONFIG_GPIOLIB */ |
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#endif /* __LINUX_GPIO_H */
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