Linux/include/linux/gpio.h

  1 #ifndef __LINUX_GPIO_H
  2 #define __LINUX_GPIO_H
  3 
  4 #include <linux/errno.h>
  5 
  6 /* see Documentation/gpio.txt */
  7 
  8 /* make these flag values available regardless of GPIO kconfig options */
  9 #define GPIOF_DIR_OUT   (0 << 0)
 10 #define GPIOF_DIR_IN    (1 << 0)
 11 
 12 #define GPIOF_INIT_LOW  (0 << 1)
 13 #define GPIOF_INIT_HIGH (1 << 1)
 14 
 15 #define GPIOF_IN                (GPIOF_DIR_IN)
 16 #define GPIOF_OUT_INIT_LOW      (GPIOF_DIR_OUT | GPIOF_INIT_LOW)
 17 #define GPIOF_OUT_INIT_HIGH     (GPIOF_DIR_OUT | GPIOF_INIT_HIGH)
 18 
 19 /* Gpio pin is open drain */
 20 #define GPIOF_OPEN_DRAIN        (1 << 2)
 21 
 22 /* Gpio pin is open source */
 23 #define GPIOF_OPEN_SOURCE       (1 << 3)
 24 
 25 #define GPIOF_EXPORT            (1 << 4)
 26 #define GPIOF_EXPORT_CHANGEABLE (1 << 5)
 27 #define GPIOF_EXPORT_DIR_FIXED  (GPIOF_EXPORT)
 28 #define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE)
 29 
 30 /**
 31  * struct gpio - a structure describing a GPIO with configuration
 32  * @gpio:       the GPIO number
 33  * @flags:      GPIO configuration as specified by GPIOF_*
 34  * @label:      a literal description string of this GPIO
 35  */
 36 struct gpio {
 37         unsigned        gpio;
 38         unsigned long   flags;
 39         const char      *label;
 40 };
 41 
 42 #ifdef CONFIG_GENERIC_GPIO
 43 
 44 #ifdef CONFIG_ARCH_HAVE_CUSTOM_GPIO_H
 45 #include <asm/gpio.h>
 46 #else
 47 
 48 #include <asm-generic/gpio.h>
 49 
 50 static inline int gpio_get_value(unsigned int gpio)
 51 {
 52         return __gpio_get_value(gpio);
 53 }
 54 
 55 static inline void gpio_set_value(unsigned int gpio, int value)
 56 {
 57         __gpio_set_value(gpio, value);
 58 }
 59 
 60 static inline int gpio_cansleep(unsigned int gpio)
 61 {
 62         return __gpio_cansleep(gpio);
 63 }
 64 
 65 static inline int gpio_to_irq(unsigned int gpio)
 66 {
 67         return __gpio_to_irq(gpio);
 68 }
 69 
 70 static inline int irq_to_gpio(unsigned int irq)
 71 {
 72         return -EINVAL;
 73 }
 74 
 75 #endif /* ! CONFIG_ARCH_HAVE_CUSTOM_GPIO_H */
 76 
 77 #else /* ! CONFIG_GENERIC_GPIO */
 78 
 79 #include <linux/kernel.h>
 80 #include <linux/types.h>
 81 #include <linux/errno.h>
 82 #include <linux/bug.h>
 83 
 84 struct device;
 85 struct gpio_chip;
 86 
 87 static inline bool gpio_is_valid(int number)
 88 {
 89         return false;
 90 }
 91 
 92 static inline int gpio_request(unsigned gpio, const char *label)
 93 {
 94         return -ENOSYS;
 95 }
 96 
 97 static inline int devm_gpio_request(struct device *dev, unsigned gpio,
 98                                     const char *label)
 99 {
100         return -ENOSYS;
101 }
102 
103 static inline int gpio_request_one(unsigned gpio,
104                                         unsigned long flags, const char *label)
105 {
106         return -ENOSYS;
107 }
108 
109 static inline int devm_gpio_request_one(struct device *dev, unsigned gpio,
110                                         unsigned long flags, const char *label)
111 {
112         return -ENOSYS;
113 }
114 
115 static inline int gpio_request_array(const struct gpio *array, size_t num)
116 {
117         return -ENOSYS;
118 }
119 
120 static inline void gpio_free(unsigned gpio)
121 {
122         might_sleep();
123 
124         /* GPIO can never have been requested */
125         WARN_ON(1);
126 }
127 
128 static inline void devm_gpio_free(struct device *dev, unsigned gpio)
129 {
130         might_sleep();
131 
132         /* GPIO can never have been requested */
133         WARN_ON(1);
134 }
135 
136 static inline void gpio_free_array(const struct gpio *array, size_t num)
137 {
138         might_sleep();
139 
140         /* GPIO can never have been requested */
141         WARN_ON(1);
142 }
143 
144 static inline int gpio_direction_input(unsigned gpio)
145 {
146         return -ENOSYS;
147 }
148 
149 static inline int gpio_direction_output(unsigned gpio, int value)
150 {
151         return -ENOSYS;
152 }
153 
154 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
155 {
156         return -ENOSYS;
157 }
158 
159 static inline int gpio_get_value(unsigned gpio)
160 {
161         /* GPIO can never have been requested or set as {in,out}put */
162         WARN_ON(1);
163         return 0;
164 }
165 
166 static inline void gpio_set_value(unsigned gpio, int value)
167 {
168         /* GPIO can never have been requested or set as output */
169         WARN_ON(1);
170 }
171 
172 static inline int gpio_cansleep(unsigned gpio)
173 {
174         /* GPIO can never have been requested or set as {in,out}put */
175         WARN_ON(1);
176         return 0;
177 }
178 
179 static inline int gpio_get_value_cansleep(unsigned gpio)
180 {
181         /* GPIO can never have been requested or set as {in,out}put */
182         WARN_ON(1);
183         return 0;
184 }
185 
186 static inline void gpio_set_value_cansleep(unsigned gpio, int value)
187 {
188         /* GPIO can never have been requested or set as output */
189         WARN_ON(1);
190 }
191 
192 static inline int gpio_export(unsigned gpio, bool direction_may_change)
193 {
194         /* GPIO can never have been requested or set as {in,out}put */
195         WARN_ON(1);
196         return -EINVAL;
197 }
198 
199 static inline int gpio_export_link(struct device *dev, const char *name,
200                                 unsigned gpio)
201 {
202         /* GPIO can never have been exported */
203         WARN_ON(1);
204         return -EINVAL;
205 }
206 
207 static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
208 {
209         /* GPIO can never have been requested */
210         WARN_ON(1);
211         return -EINVAL;
212 }
213 
214 static inline void gpio_unexport(unsigned gpio)
215 {
216         /* GPIO can never have been exported */
217         WARN_ON(1);
218 }
219 
220 static inline int gpio_to_irq(unsigned gpio)
221 {
222         /* GPIO can never have been requested or set as input */
223         WARN_ON(1);
224         return -EINVAL;
225 }
226 
227 static inline int irq_to_gpio(unsigned irq)
228 {
229         /* irq can never have been returned from gpio_to_irq() */
230         WARN_ON(1);
231         return -EINVAL;
232 }
233 
234 static inline int
235 gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
236                        unsigned int gpio_offset, unsigned int pin_offset,
237                        unsigned int npins)
238 {
239         WARN_ON(1);
240         return -EINVAL;
241 }
242 
243 static inline void
244 gpiochip_remove_pin_ranges(struct gpio_chip *chip)
245 {
246         WARN_ON(1);
247 }
248 
249 #endif /* ! CONFIG_GENERIC_GPIO */
250 
251 #endif /* __LINUX_GPIO_H */
252 

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