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4c20386c DB |
1 | #ifndef _ASM_GENERIC_GPIO_H |
2 | #define _ASM_GENERIC_GPIO_H | |
3 | ||
b3db4a8a | 4 | #include <linux/kernel.h> |
6ea0205b | 5 | #include <linux/types.h> |
25947d5a | 6 | #include <linux/errno.h> |
15c9a0ac | 7 | #include <linux/of.h> |
f23f1516 | 8 | #include <linux/pinctrl/pinctrl.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 | |
7ca267fa | 30 | #define ARCH_NR_GPIOS 512 |
d2876d08 DB |
31 | #endif |
32 | ||
c956126c DB |
33 | /* |
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. | |
37 | * | |
38 | * Invalid GPIO numbers are useful for indicating no-such-GPIO in | |
39 | * platform data and other tables. | |
40 | */ | |
41 | ||
3474cb3c | 42 | static inline bool gpio_is_valid(int number) |
e6de1808 | 43 | { |
3474cb3c | 44 | return number >= 0 && number < ARCH_NR_GPIOS; |
e6de1808 GL |
45 | } |
46 | ||
1f018c8d | 47 | struct device; |
feb83699 | 48 | struct gpio; |
d2876d08 | 49 | struct seq_file; |
438d8908 | 50 | struct module; |
a19e3da5 | 51 | struct device_node; |
6c0b4e6c | 52 | struct gpio_desc; |
d2876d08 | 53 | |
79a9becd AC |
54 | /* caller holds gpio_lock *OR* gpio is marked as requested */ |
55 | static inline struct gpio_chip *gpio_to_chip(unsigned gpio) | |
56 | { | |
57 | return gpiod_to_chip(gpio_to_desc(gpio)); | |
58 | } | |
d2876d08 DB |
59 | |
60 | /* Always use the library code for GPIO management calls, | |
61 | * or when sleeping may be involved. | |
62 | */ | |
d8a3515e | 63 | extern int gpio_request(unsigned gpio, const char *label); |
d2876d08 DB |
64 | extern void gpio_free(unsigned gpio); |
65 | ||
c7caf868 AC |
66 | static inline int gpio_direction_input(unsigned gpio) |
67 | { | |
68 | return gpiod_direction_input(gpio_to_desc(gpio)); | |
69 | } | |
70 | static inline int gpio_direction_output(unsigned gpio, int value) | |
71 | { | |
72 | return gpiod_direction_output_raw(gpio_to_desc(gpio), value); | |
73 | } | |
d2876d08 | 74 | |
c7caf868 AC |
75 | static inline int gpio_set_debounce(unsigned gpio, unsigned debounce) |
76 | { | |
77 | return gpiod_set_debounce(gpio_to_desc(gpio), debounce); | |
78 | } | |
c4b5be98 | 79 | |
79a9becd AC |
80 | static inline int gpio_get_value_cansleep(unsigned gpio) |
81 | { | |
82 | return gpiod_get_raw_value_cansleep(gpio_to_desc(gpio)); | |
83 | } | |
84 | static inline void gpio_set_value_cansleep(unsigned gpio, int value) | |
85 | { | |
86 | return gpiod_set_raw_value_cansleep(gpio_to_desc(gpio), value); | |
87 | } | |
d2876d08 DB |
88 | |
89 | ||
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. | |
93 | */ | |
79a9becd AC |
94 | static inline int __gpio_get_value(unsigned gpio) |
95 | { | |
96 | return gpiod_get_raw_value(gpio_to_desc(gpio)); | |
97 | } | |
98 | static inline void __gpio_set_value(unsigned gpio, int value) | |
99 | { | |
100 | return gpiod_set_raw_value(gpio_to_desc(gpio), value); | |
101 | } | |
d2876d08 | 102 | |
79a9becd AC |
103 | static inline int __gpio_cansleep(unsigned gpio) |
104 | { | |
105 | return gpiod_cansleep(gpio_to_desc(gpio)); | |
106 | } | |
d2876d08 | 107 | |
79a9becd AC |
108 | static inline int __gpio_to_irq(unsigned gpio) |
109 | { | |
110 | return gpiod_to_irq(gpio_to_desc(gpio)); | |
111 | } | |
d2876d08 | 112 | |
d8a3515e | 113 | extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *label); |
7c295975 LPC |
114 | extern int gpio_request_array(const struct gpio *array, size_t num); |
115 | extern void gpio_free_array(const struct gpio *array, size_t num); | |
3e45f1d1 | 116 | |
d8f388d8 DB |
117 | /* |
118 | * A sysfs interface can be exported by individual drivers if they want, | |
119 | * but more typically is configured entirely from userspace. | |
120 | */ | |
79a9becd AC |
121 | static inline int gpio_export(unsigned gpio, bool direction_may_change) |
122 | { | |
123 | return gpiod_export(gpio_to_desc(gpio), direction_may_change); | |
124 | } | |
d8f388d8 | 125 | |
79a9becd AC |
126 | static inline int gpio_export_link(struct device *dev, const char *name, |
127 | unsigned gpio) | |
128 | { | |
129 | return gpiod_export_link(dev, name, gpio_to_desc(gpio)); | |
130 | } | |
131 | ||
132 | static inline int gpio_sysfs_set_active_low(unsigned gpio, int value) | |
133 | { | |
134 | return gpiod_sysfs_set_active_low(gpio_to_desc(gpio), value); | |
135 | } | |
136 | ||
137 | static inline void gpio_unexport(unsigned gpio) | |
138 | { | |
139 | gpiod_unexport(gpio_to_desc(gpio)); | |
140 | } | |
d8f388d8 | 141 | |
d59b4eaa SG |
142 | #ifdef CONFIG_PINCTRL |
143 | ||
144 | /** | |
145 | * struct gpio_pin_range - pin range controlled by a gpio chip | |
146 | * @head: list for maintaining set of pin ranges, used internally | |
147 | * @pctldev: pinctrl device which handles corresponding pins | |
148 | * @range: actual range of pins controlled by a gpio controller | |
149 | */ | |
150 | ||
151 | struct gpio_pin_range { | |
152 | struct list_head node; | |
153 | struct pinctrl_dev *pctldev; | |
154 | struct pinctrl_gpio_range range; | |
155 | }; | |
156 | ||
157 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, | |
158 | unsigned int gpio_offset, unsigned int pin_offset, | |
159 | unsigned int npins); | |
586a87e6 CR |
160 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, |
161 | struct pinctrl_dev *pctldev, | |
162 | unsigned int gpio_offset, const char *pin_group); | |
d59b4eaa SG |
163 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip); |
164 | ||
165 | #else | |
166 | ||
167 | static inline int | |
168 | gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, | |
169 | unsigned int gpio_offset, unsigned int pin_offset, | |
170 | unsigned int npins) | |
171 | { | |
172 | return 0; | |
173 | } | |
586a87e6 CR |
174 | static inline int |
175 | gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
176 | struct pinctrl_dev *pctldev, | |
177 | unsigned int gpio_offset, const char *pin_group) | |
178 | { | |
179 | return 0; | |
180 | } | |
d59b4eaa SG |
181 | |
182 | static inline void | |
183 | gpiochip_remove_pin_ranges(struct gpio_chip *chip) | |
184 | { | |
185 | } | |
186 | ||
187 | #endif /* CONFIG_PINCTRL */ | |
188 | ||
09cd9527 | 189 | #else /* !CONFIG_GPIOLIB */ |
d2876d08 | 190 | |
3474cb3c | 191 | static inline bool gpio_is_valid(int number) |
e6de1808 GL |
192 | { |
193 | /* only non-negative numbers are valid */ | |
194 | return number >= 0; | |
195 | } | |
196 | ||
4c20386c DB |
197 | /* platforms that don't directly support access to GPIOs through I2C, SPI, |
198 | * or other blocking infrastructure can use these wrappers. | |
199 | */ | |
200 | ||
201 | static inline int gpio_cansleep(unsigned gpio) | |
202 | { | |
203 | return 0; | |
204 | } | |
205 | ||
206 | static inline int gpio_get_value_cansleep(unsigned gpio) | |
207 | { | |
208 | might_sleep(); | |
eb9ae7f2 | 209 | return __gpio_get_value(gpio); |
4c20386c DB |
210 | } |
211 | ||
212 | static inline void gpio_set_value_cansleep(unsigned gpio, int value) | |
213 | { | |
214 | might_sleep(); | |
eb9ae7f2 | 215 | __gpio_set_value(gpio, value); |
4c20386c DB |
216 | } |
217 | ||
09cd9527 | 218 | #endif /* !CONFIG_GPIOLIB */ |
d8f388d8 | 219 | |
4c20386c | 220 | #endif /* _ASM_GENERIC_GPIO_H */ |