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1 | #ifndef _ASM_GENERIC_GPIO_H | |
2 | #define _ASM_GENERIC_GPIO_H | |
3 | ||
4 | #include <linux/kernel.h> | |
5 | #include <linux/types.h> | |
6 | #include <linux/errno.h> | |
7 | #include <linux/of.h> | |
8 | #include <linux/pinctrl/pinctrl.h> | |
9 | ||
10 | #ifdef CONFIG_GPIOLIB | |
11 | ||
12 | #include <linux/compiler.h> | |
13 | #include <linux/gpio/driver.h> | |
14 | #include <linux/gpio/consumer.h> | |
15 | ||
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 | |
22 | * smaller range 0..ARCH_NR_GPIOS-1. | |
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. | |
27 | */ | |
28 | ||
29 | #ifndef ARCH_NR_GPIOS | |
30 | #define ARCH_NR_GPIOS 256 | |
31 | #endif | |
32 | ||
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 | ||
42 | static inline bool gpio_is_valid(int number) | |
43 | { | |
44 | return number >= 0 && number < ARCH_NR_GPIOS; | |
45 | } | |
46 | ||
47 | struct device; | |
48 | struct gpio; | |
49 | struct seq_file; | |
50 | struct module; | |
51 | struct device_node; | |
52 | struct gpio_desc; | |
53 | ||
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 | } | |
59 | ||
60 | /* Always use the library code for GPIO management calls, | |
61 | * or when sleeping may be involved. | |
62 | */ | |
63 | extern int gpio_request(unsigned gpio, const char *label); | |
64 | extern void gpio_free(unsigned gpio); | |
65 | ||
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 | } | |
74 | ||
75 | static inline int gpio_set_debounce(unsigned gpio, unsigned debounce) | |
76 | { | |
77 | return gpiod_set_debounce(gpio_to_desc(gpio), debounce); | |
78 | } | |
79 | ||
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 | } | |
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 | */ | |
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 | } | |
102 | ||
103 | static inline int __gpio_cansleep(unsigned gpio) | |
104 | { | |
105 | return gpiod_cansleep(gpio_to_desc(gpio)); | |
106 | } | |
107 | ||
108 | static inline int __gpio_to_irq(unsigned gpio) | |
109 | { | |
110 | return gpiod_to_irq(gpio_to_desc(gpio)); | |
111 | } | |
112 | ||
113 | extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *label); | |
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); | |
116 | ||
117 | /* | |
118 | * A sysfs interface can be exported by individual drivers if they want, | |
119 | * but more typically is configured entirely from userspace. | |
120 | */ | |
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 | } | |
125 | ||
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 | } | |
141 | ||
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); | |
160 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
161 | struct pinctrl_dev *pctldev, | |
162 | unsigned int gpio_offset, const char *pin_group); | |
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 | } | |
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 | } | |
181 | ||
182 | static inline void | |
183 | gpiochip_remove_pin_ranges(struct gpio_chip *chip) | |
184 | { | |
185 | } | |
186 | ||
187 | #endif /* CONFIG_PINCTRL */ | |
188 | ||
189 | #else /* !CONFIG_GPIOLIB */ | |
190 | ||
191 | static inline bool gpio_is_valid(int number) | |
192 | { | |
193 | /* only non-negative numbers are valid */ | |
194 | return number >= 0; | |
195 | } | |
196 | ||
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(); | |
209 | return __gpio_get_value(gpio); | |
210 | } | |
211 | ||
212 | static inline void gpio_set_value_cansleep(unsigned gpio, int value) | |
213 | { | |
214 | might_sleep(); | |
215 | __gpio_set_value(gpio, value); | |
216 | } | |
217 | ||
218 | #endif /* !CONFIG_GPIOLIB */ | |
219 | ||
220 | #endif /* _ASM_GENERIC_GPIO_H */ |