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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
4c20386c DB |
2 | #ifndef _ASM_GENERIC_GPIO_H |
3 | #define _ASM_GENERIC_GPIO_H | |
4 | ||
b3db4a8a | 5 | #include <linux/kernel.h> |
6ea0205b | 6 | #include <linux/types.h> |
25947d5a | 7 | #include <linux/errno.h> |
15c9a0ac | 8 | #include <linux/of.h> |
6ea0205b | 9 | |
7444a72e | 10 | #ifdef CONFIG_GPIOLIB |
d2876d08 | 11 | |
6ea0205b | 12 | #include <linux/compiler.h> |
79a9becd AC |
13 | #include <linux/gpio/driver.h> |
14 | #include <linux/gpio/consumer.h> | |
6ea0205b | 15 | |
d2876d08 DB |
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). | |
19 | * | |
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 | |
6a9436d0 | 22 | * smaller range 0..ARCH_NR_GPIOS-1. |
c956126c DB |
23 | * |
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. | |
d2876d08 DB |
27 | */ |
28 | ||
29 | #ifndef ARCH_NR_GPIOS | |
aa6aedb5 AB |
30 | #if defined(CONFIG_ARCH_NR_GPIO) && CONFIG_ARCH_NR_GPIO > 0 |
31 | #define ARCH_NR_GPIOS CONFIG_ARCH_NR_GPIO | |
32 | #else | |
7ca267fa | 33 | #define ARCH_NR_GPIOS 512 |
d2876d08 | 34 | #endif |
aa6aedb5 | 35 | #endif |
d2876d08 | 36 | |
c956126c DB |
37 | /* |
38 | * "valid" GPIO numbers are nonnegative and may be passed to | |
39 | * setup routines like gpio_request(). only some valid numbers | |
40 | * can successfully be requested and used. | |
41 | * | |
42 | * Invalid GPIO numbers are useful for indicating no-such-GPIO in | |
43 | * platform data and other tables. | |
44 | */ | |
45 | ||
3474cb3c | 46 | static inline bool gpio_is_valid(int number) |
e6de1808 | 47 | { |
3474cb3c | 48 | return number >= 0 && number < ARCH_NR_GPIOS; |
e6de1808 GL |
49 | } |
50 | ||
1f018c8d | 51 | struct device; |
feb83699 | 52 | struct gpio; |
d2876d08 | 53 | struct seq_file; |
438d8908 | 54 | struct module; |
a19e3da5 | 55 | struct device_node; |
6c0b4e6c | 56 | struct gpio_desc; |
d2876d08 | 57 | |
79a9becd AC |
58 | /* caller holds gpio_lock *OR* gpio is marked as requested */ |
59 | static inline struct gpio_chip *gpio_to_chip(unsigned gpio) | |
60 | { | |
61 | return gpiod_to_chip(gpio_to_desc(gpio)); | |
62 | } | |
d2876d08 DB |
63 | |
64 | /* Always use the library code for GPIO management calls, | |
65 | * or when sleeping may be involved. | |
66 | */ | |
d8a3515e | 67 | extern int gpio_request(unsigned gpio, const char *label); |
d2876d08 DB |
68 | extern void gpio_free(unsigned gpio); |
69 | ||
c7caf868 AC |
70 | static inline int gpio_direction_input(unsigned gpio) |
71 | { | |
72 | return gpiod_direction_input(gpio_to_desc(gpio)); | |
73 | } | |
74 | static inline int gpio_direction_output(unsigned gpio, int value) | |
75 | { | |
76 | return gpiod_direction_output_raw(gpio_to_desc(gpio), value); | |
77 | } | |
d2876d08 | 78 | |
c7caf868 AC |
79 | static inline int gpio_set_debounce(unsigned gpio, unsigned debounce) |
80 | { | |
81 | return gpiod_set_debounce(gpio_to_desc(gpio), debounce); | |
82 | } | |
c4b5be98 | 83 | |
79a9becd AC |
84 | static inline int gpio_get_value_cansleep(unsigned gpio) |
85 | { | |
86 | return gpiod_get_raw_value_cansleep(gpio_to_desc(gpio)); | |
87 | } | |
88 | static inline void gpio_set_value_cansleep(unsigned gpio, int value) | |
89 | { | |
90 | return gpiod_set_raw_value_cansleep(gpio_to_desc(gpio), value); | |
91 | } | |
d2876d08 DB |
92 | |
93 | ||
94 | /* A platform's <asm/gpio.h> code may want to inline the I/O calls when | |
95 | * the GPIO is constant and refers to some always-present controller, | |
96 | * giving direct access to chip registers and tight bitbanging loops. | |
97 | */ | |
79a9becd AC |
98 | static inline int __gpio_get_value(unsigned gpio) |
99 | { | |
100 | return gpiod_get_raw_value(gpio_to_desc(gpio)); | |
101 | } | |
102 | static inline void __gpio_set_value(unsigned gpio, int value) | |
103 | { | |
104 | return gpiod_set_raw_value(gpio_to_desc(gpio), value); | |
105 | } | |
d2876d08 | 106 | |
79a9becd AC |
107 | static inline int __gpio_cansleep(unsigned gpio) |
108 | { | |
109 | return gpiod_cansleep(gpio_to_desc(gpio)); | |
110 | } | |
d2876d08 | 111 | |
79a9becd AC |
112 | static inline int __gpio_to_irq(unsigned gpio) |
113 | { | |
114 | return gpiod_to_irq(gpio_to_desc(gpio)); | |
115 | } | |
d2876d08 | 116 | |
d8a3515e | 117 | extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *label); |
7c295975 LPC |
118 | extern int gpio_request_array(const struct gpio *array, size_t num); |
119 | extern void gpio_free_array(const struct gpio *array, size_t num); | |
3e45f1d1 | 120 | |
d8f388d8 DB |
121 | /* |
122 | * A sysfs interface can be exported by individual drivers if they want, | |
123 | * but more typically is configured entirely from userspace. | |
124 | */ | |
79a9becd AC |
125 | static inline int gpio_export(unsigned gpio, bool direction_may_change) |
126 | { | |
127 | return gpiod_export(gpio_to_desc(gpio), direction_may_change); | |
128 | } | |
d8f388d8 | 129 | |
79a9becd AC |
130 | static inline int gpio_export_link(struct device *dev, const char *name, |
131 | unsigned gpio) | |
132 | { | |
133 | return gpiod_export_link(dev, name, gpio_to_desc(gpio)); | |
134 | } | |
135 | ||
79a9becd AC |
136 | static inline void gpio_unexport(unsigned gpio) |
137 | { | |
138 | gpiod_unexport(gpio_to_desc(gpio)); | |
139 | } | |
d8f388d8 | 140 | |
09cd9527 | 141 | #else /* !CONFIG_GPIOLIB */ |
d2876d08 | 142 | |
3474cb3c | 143 | static inline bool gpio_is_valid(int number) |
e6de1808 GL |
144 | { |
145 | /* only non-negative numbers are valid */ | |
146 | return number >= 0; | |
147 | } | |
148 | ||
4c20386c DB |
149 | /* platforms that don't directly support access to GPIOs through I2C, SPI, |
150 | * or other blocking infrastructure can use these wrappers. | |
151 | */ | |
152 | ||
153 | static inline int gpio_cansleep(unsigned gpio) | |
154 | { | |
155 | return 0; | |
156 | } | |
157 | ||
158 | static inline int gpio_get_value_cansleep(unsigned gpio) | |
159 | { | |
160 | might_sleep(); | |
eb9ae7f2 | 161 | return __gpio_get_value(gpio); |
4c20386c DB |
162 | } |
163 | ||
164 | static inline void gpio_set_value_cansleep(unsigned gpio, int value) | |
165 | { | |
166 | might_sleep(); | |
eb9ae7f2 | 167 | __gpio_set_value(gpio, value); |
4c20386c DB |
168 | } |
169 | ||
09cd9527 | 170 | #endif /* !CONFIG_GPIOLIB */ |
d8f388d8 | 171 | |
4c20386c | 172 | #endif /* _ASM_GENERIC_GPIO_H */ |