1 #ifndef _ASM_GENERIC_GPIO_H
2 #define _ASM_GENERIC_GPIO_H
4 #include <linux/kernel.h>
5 #include <linux/types.h>
6 #include <linux/errno.h>
8 #include <linux/pinctrl/pinctrl.h>
12 #include <linux/compiler.h>
13 #include <linux/gpio/driver.h>
14 #include <linux/gpio/consumer.h>
16 /* Platforms may implement their GPIO interface with library code,
17 * at a small performance cost for non-inlined operations and some
18 * extra memory (for code and for per-GPIO table entries).
20 * While the GPIO programming interface defines valid GPIO numbers
21 * to be in the range 0..MAX_INT, this library restricts them to the
22 * smaller range 0..ARCH_NR_GPIOS-1.
24 * ARCH_NR_GPIOS is somewhat arbitrary; it usually reflects the sum of
25 * builtin/SoC GPIOs plus a number of GPIOs on expanders; the latter is
26 * actually an estimate of a board-specific value.
30 #define ARCH_NR_GPIOS 256
34 * "valid" GPIO numbers are nonnegative and may be passed to
35 * setup routines like gpio_request(). only some valid numbers
36 * can successfully be requested and used.
38 * Invalid GPIO numbers are useful for indicating no-such-GPIO in
39 * platform data and other tables.
42 static inline bool gpio_is_valid(int number
)
44 return number
>= 0 && number
< ARCH_NR_GPIOS
;
54 /* caller holds gpio_lock *OR* gpio is marked as requested */
55 static inline struct gpio_chip
*gpio_to_chip(unsigned gpio
)
57 return gpiod_to_chip(gpio_to_desc(gpio
));
60 /* Always use the library code for GPIO management calls,
61 * or when sleeping may be involved.
63 extern int gpio_request(unsigned gpio
, const char *label
);
64 extern void gpio_free(unsigned gpio
);
66 static inline int gpio_direction_input(unsigned gpio
)
68 return gpiod_direction_input(gpio_to_desc(gpio
));
70 static inline int gpio_direction_output(unsigned gpio
, int value
)
72 return gpiod_direction_output_raw(gpio_to_desc(gpio
), value
);
75 static inline int gpio_set_debounce(unsigned gpio
, unsigned debounce
)
77 return gpiod_set_debounce(gpio_to_desc(gpio
), debounce
);
80 static inline int gpio_get_value_cansleep(unsigned gpio
)
82 return gpiod_get_raw_value_cansleep(gpio_to_desc(gpio
));
84 static inline void gpio_set_value_cansleep(unsigned gpio
, int value
)
86 return gpiod_set_raw_value_cansleep(gpio_to_desc(gpio
), value
);
90 /* A platform's <asm/gpio.h> code may want to inline the I/O calls when
91 * the GPIO is constant and refers to some always-present controller,
92 * giving direct access to chip registers and tight bitbanging loops.
94 static inline int __gpio_get_value(unsigned gpio
)
96 return gpiod_get_raw_value(gpio_to_desc(gpio
));
98 static inline void __gpio_set_value(unsigned gpio
, int value
)
100 return gpiod_set_raw_value(gpio_to_desc(gpio
), value
);
103 static inline int __gpio_cansleep(unsigned gpio
)
105 return gpiod_cansleep(gpio_to_desc(gpio
));
108 static inline int __gpio_to_irq(unsigned gpio
)
110 return gpiod_to_irq(gpio_to_desc(gpio
));
113 extern int gpio_lock_as_irq(struct gpio_chip
*chip
, unsigned int offset
);
114 extern void gpio_unlock_as_irq(struct gpio_chip
*chip
, unsigned int offset
);
116 extern int gpio_request_one(unsigned gpio
, unsigned long flags
, const char *label
);
117 extern int gpio_request_array(const struct gpio
*array
, size_t num
);
118 extern void gpio_free_array(const struct gpio
*array
, size_t num
);
121 * A sysfs interface can be exported by individual drivers if they want,
122 * but more typically is configured entirely from userspace.
124 static inline int gpio_export(unsigned gpio
, bool direction_may_change
)
126 return gpiod_export(gpio_to_desc(gpio
), direction_may_change
);
129 static inline int gpio_export_link(struct device
*dev
, const char *name
,
132 return gpiod_export_link(dev
, name
, gpio_to_desc(gpio
));
135 static inline int gpio_sysfs_set_active_low(unsigned gpio
, int value
)
137 return gpiod_sysfs_set_active_low(gpio_to_desc(gpio
), value
);
140 static inline void gpio_unexport(unsigned gpio
)
142 gpiod_unexport(gpio_to_desc(gpio
));
145 #ifdef CONFIG_PINCTRL
148 * struct gpio_pin_range - pin range controlled by a gpio chip
149 * @head: list for maintaining set of pin ranges, used internally
150 * @pctldev: pinctrl device which handles corresponding pins
151 * @range: actual range of pins controlled by a gpio controller
154 struct gpio_pin_range
{
155 struct list_head node
;
156 struct pinctrl_dev
*pctldev
;
157 struct pinctrl_gpio_range range
;
160 int gpiochip_add_pin_range(struct gpio_chip
*chip
, const char *pinctl_name
,
161 unsigned int gpio_offset
, unsigned int pin_offset
,
163 int gpiochip_add_pingroup_range(struct gpio_chip
*chip
,
164 struct pinctrl_dev
*pctldev
,
165 unsigned int gpio_offset
, const char *pin_group
);
166 void gpiochip_remove_pin_ranges(struct gpio_chip
*chip
);
171 gpiochip_add_pin_range(struct gpio_chip
*chip
, const char *pinctl_name
,
172 unsigned int gpio_offset
, unsigned int pin_offset
,
178 gpiochip_add_pingroup_range(struct gpio_chip
*chip
,
179 struct pinctrl_dev
*pctldev
,
180 unsigned int gpio_offset
, const char *pin_group
)
186 gpiochip_remove_pin_ranges(struct gpio_chip
*chip
)
190 #endif /* CONFIG_PINCTRL */
192 #else /* !CONFIG_GPIOLIB */
194 static inline bool gpio_is_valid(int number
)
196 /* only non-negative numbers are valid */
200 /* platforms that don't directly support access to GPIOs through I2C, SPI,
201 * or other blocking infrastructure can use these wrappers.
204 static inline int gpio_cansleep(unsigned gpio
)
209 static inline int gpio_get_value_cansleep(unsigned gpio
)
212 return __gpio_get_value(gpio
);
215 static inline void gpio_set_value_cansleep(unsigned gpio
, int value
)
218 __gpio_set_value(gpio
, value
);
221 #endif /* !CONFIG_GPIOLIB */
223 #endif /* _ASM_GENERIC_GPIO_H */
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