diff options
Diffstat (limited to 'include/asm-generic/gpio.h')
| -rw-r--r-- | include/asm-generic/gpio.h | 288 |
1 files changed, 120 insertions, 168 deletions
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index ff5c66080c8..23e364538ab 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -4,10 +4,14 @@ #include <linux/kernel.h> #include <linux/types.h> #include <linux/errno.h> +#include <linux/of.h> +#include <linux/pinctrl/pinctrl.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 @@ -35,114 +39,23 @@ * platform data and other tables. */ -static inline int gpio_is_valid(int number) +static inline bool gpio_is_valid(int number) { - return ((unsigned)number) < ARCH_NR_GPIOS; + return number >= 0 && number < ARCH_NR_GPIOS; } struct device; +struct gpio; struct seq_file; struct module; struct device_node; +struct gpio_desc; -/** - * struct gpio_chip - abstract a GPIO controller - * @label: for diagnostics - * @dev: optional device providing the GPIOs - * @owner: helps prevent removal of modules exporting active GPIOs - * @request: optional hook for chip-specific activation, such as - * enabling module power and clock; may sleep - * @free: optional hook for chip-specific deactivation, such as - * disabling module power and clock; may sleep - * @direction_input: configures signal "offset" as input, or returns error - * @get: returns value for signal "offset"; for output signals this - * returns either the value actually sensed, or zero - * @direction_output: configures signal "offset" as output, or returns error - * @set: assigns output value for signal "offset" - * @to_irq: optional hook supporting non-static gpio_to_irq() mappings; - * implementation may not sleep - * @dbg_show: optional routine to show contents in debugfs; default code - * will be used when this is omitted, but custom code can show extra - * state (such as pullup/pulldown configuration). - * @base: identifies the first GPIO number handled by this chip; or, if - * negative during registration, requests dynamic ID allocation. - * @ngpio: the number of GPIOs handled by this controller; the last GPIO - * handled is (base + ngpio - 1). - * @can_sleep: flag must be set iff get()/set() methods sleep, as they - * must while accessing GPIO expander chips over I2C or SPI - * @names: if set, must be an array of strings to use as alternative - * names for the GPIOs in this chip. Any entry in the array - * may be NULL if there is no alias for the GPIO, however the - * array must be @ngpio entries long. A name can include a single printk - * format specifier for an unsigned int. It is substituted by the actual - * number of the gpio. - * - * A gpio_chip can help platforms abstract various sources of GPIOs so - * they can all be accessed through a common programing interface. - * Example sources would be SOC controllers, FPGAs, multifunction - * chips, dedicated GPIO expanders, and so on. - * - * Each chip controls a number of signals, identified in method calls - * by "offset" values in the range 0..(@ngpio - 1). When those signals - * are referenced through calls like gpio_get_value(gpio), the offset - * is calculated by subtracting @base from the gpio number. - */ -struct gpio_chip { - const char *label; - struct device *dev; - struct module *owner; - - int (*request)(struct gpio_chip *chip, - unsigned offset); - void (*free)(struct gpio_chip *chip, - unsigned offset); - - int (*direction_input)(struct gpio_chip *chip, - unsigned offset); - int (*get)(struct gpio_chip *chip, - unsigned offset); - int (*direction_output)(struct gpio_chip *chip, - unsigned offset, int value); - int (*set_debounce)(struct gpio_chip *chip, - unsigned offset, unsigned debounce); - - void (*set)(struct gpio_chip *chip, - unsigned offset, int value); - - int (*to_irq)(struct gpio_chip *chip, - unsigned offset); - - void (*dbg_show)(struct seq_file *s, - struct gpio_chip *chip); - int base; - u16 ngpio; - const char *const *names; - unsigned can_sleep:1; - unsigned exported:1; - -#if defined(CONFIG_OF_GPIO) - /* - * If CONFIG_OF is enabled, then all GPIO controllers described in the - * device tree automatically may have an OF translation - */ - struct device_node *of_node; - int of_gpio_n_cells; - int (*of_xlate)(struct gpio_chip *gc, struct device_node *np, - const void *gpio_spec, u32 *flags); -#endif -}; - -extern const char *gpiochip_is_requested(struct gpio_chip *chip, - unsigned offset); -extern int __must_check gpiochip_reserve(int start, int ngpio); - -/* add/remove chips */ -extern int gpiochip_add(struct gpio_chip *chip); -extern int __must_check gpiochip_remove(struct gpio_chip *chip); -extern struct gpio_chip *gpiochip_find(void *data, - int (*match)(struct gpio_chip *chip, - void *data)); - +/* 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. @@ -150,69 +63,135 @@ extern struct gpio_chip *gpiochip_find(void *data, extern int gpio_request(unsigned gpio, const char *label); extern void gpio_free(unsigned gpio); -extern int gpio_direction_input(unsigned gpio); -extern int gpio_direction_output(unsigned gpio, int value); +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); +} -extern int gpio_set_debounce(unsigned gpio, unsigned debounce); +static inline int gpio_set_debounce(unsigned gpio, unsigned debounce) +{ + return gpiod_set_debounce(gpio_to_desc(gpio), debounce); +} -extern int gpio_get_value_cansleep(unsigned gpio); -extern void gpio_set_value_cansleep(unsigned gpio, int value); +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. */ -extern int __gpio_get_value(unsigned gpio); -extern void __gpio_set_value(unsigned gpio, int value); +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); +} -extern int __gpio_cansleep(unsigned gpio); +static inline int __gpio_cansleep(unsigned gpio) +{ + return gpiod_cansleep(gpio_to_desc(gpio)); +} -extern int __gpio_to_irq(unsigned gpio); +static inline int __gpio_to_irq(unsigned gpio) +{ + return gpiod_to_irq(gpio_to_desc(gpio)); +} -#define GPIOF_DIR_OUT (0 << 0) -#define GPIOF_DIR_IN (1 << 0) +extern int gpio_lock_as_irq(struct gpio_chip *chip, unsigned int offset); +extern void gpio_unlock_as_irq(struct gpio_chip *chip, unsigned int offset); + +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); -#define GPIOF_INIT_LOW (0 << 1) -#define GPIOF_INIT_HIGH (1 << 1) +/* + * 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); +} -#define GPIOF_IN (GPIOF_DIR_IN) -#define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT | GPIOF_INIT_LOW) -#define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT | GPIOF_INIT_HIGH) +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 int gpio_sysfs_set_active_low(unsigned gpio, int value) +{ + return gpiod_sysfs_set_active_low(gpio_to_desc(gpio), value); +} + +static inline void gpio_unexport(unsigned gpio) +{ + gpiod_unexport(gpio_to_desc(gpio)); +} + +#ifdef CONFIG_PINCTRL /** - * struct gpio - a structure describing a GPIO with configuration - * @gpio: the GPIO number - * @flags: GPIO configuration as specified by GPIOF_* - * @label: a literal description string of this GPIO + * struct gpio_pin_range - pin range controlled by a gpio chip + * @head: list for maintaining set of pin ranges, used internally + * @pctldev: pinctrl device which handles corresponding pins + * @range: actual range of pins controlled by a gpio controller */ -struct gpio { - unsigned gpio; - unsigned long flags; - const char *label; + +struct gpio_pin_range { + struct list_head node; + struct pinctrl_dev *pctldev; + struct pinctrl_gpio_range range; }; -extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *label); -extern int gpio_request_array(struct gpio *array, size_t num); -extern void gpio_free_array(struct gpio *array, size_t num); +int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, + unsigned int gpio_offset, unsigned int pin_offset, + unsigned int npins); +int gpiochip_add_pingroup_range(struct gpio_chip *chip, + struct pinctrl_dev *pctldev, + unsigned int gpio_offset, const char *pin_group); +void gpiochip_remove_pin_ranges(struct gpio_chip *chip); -#ifdef CONFIG_GPIO_SYSFS +#else -/* - * A sysfs interface can be exported by individual drivers if they want, - * but more typically is configured entirely from userspace. - */ -extern int gpio_export(unsigned gpio, bool direction_may_change); -extern int gpio_export_link(struct device *dev, const char *name, - unsigned gpio); -extern int gpio_sysfs_set_active_low(unsigned gpio, int value); -extern void gpio_unexport(unsigned gpio); +static inline int +gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, + unsigned int gpio_offset, unsigned int pin_offset, + unsigned int npins) +{ + return 0; +} +static inline int +gpiochip_add_pingroup_range(struct gpio_chip *chip, + struct pinctrl_dev *pctldev, + unsigned int gpio_offset, const char *pin_group) +{ + return 0; +} -#endif /* CONFIG_GPIO_SYSFS */ +static inline void +gpiochip_remove_pin_ranges(struct gpio_chip *chip) +{ +} + +#endif /* CONFIG_PINCTRL */ #else /* !CONFIG_GPIOLIB */ -static inline int gpio_is_valid(int number) +static inline bool gpio_is_valid(int number) { /* only non-negative numbers are valid */ return number >= 0; @@ -230,42 +209,15 @@ static inline int gpio_cansleep(unsigned gpio) static inline int gpio_get_value_cansleep(unsigned gpio) { might_sleep(); - return gpio_get_value(gpio); + return __gpio_get_value(gpio); } static inline void gpio_set_value_cansleep(unsigned gpio, int value) { might_sleep(); - gpio_set_value(gpio, value); + __gpio_set_value(gpio, value); } #endif /* !CONFIG_GPIOLIB */ -#ifndef CONFIG_GPIO_SYSFS - -struct device; - -/* sysfs support is only available with gpiolib, where it's optional */ - -static inline int gpio_export(unsigned gpio, bool direction_may_change) -{ - return -ENOSYS; -} - -static inline int gpio_export_link(struct device *dev, const char *name, - unsigned gpio) -{ - return -ENOSYS; -} - -static inline int gpio_sysfs_set_active_low(unsigned gpio, int value) -{ - return -ENOSYS; -} - -static inline void gpio_unexport(unsigned gpio) -{ -} -#endif /* CONFIG_GPIO_SYSFS */ - #endif /* _ASM_GENERIC_GPIO_H */ |