diff options
Diffstat (limited to 'ANDROID_3.4.5/include/asm-generic/gpio.h')
| -rw-r--r-- | ANDROID_3.4.5/include/asm-generic/gpio.h | 257 |
1 files changed, 0 insertions, 257 deletions
diff --git a/ANDROID_3.4.5/include/asm-generic/gpio.h b/ANDROID_3.4.5/include/asm-generic/gpio.h deleted file mode 100644 index 70ed842f..00000000 --- a/ANDROID_3.4.5/include/asm-generic/gpio.h +++ /dev/null @@ -1,257 +0,0 @@ -#ifndef _ASM_GENERIC_GPIO_H -#define _ASM_GENERIC_GPIO_H - -#include <linux/kernel.h> -#include <linux/types.h> -#include <linux/errno.h> -#include <linux/of.h> - -#ifdef CONFIG_GPIOLIB - -#include <linux/compiler.h> - -/* Platforms may implement their GPIO interface with library code, - * at a small performance cost for non-inlined operations and some - * extra memory (for code and for per-GPIO table entries). - * - * While the GPIO programming interface defines valid GPIO numbers - * to be in the range 0..MAX_INT, this library restricts them to the - * smaller range 0..ARCH_NR_GPIOS-1. - * - * ARCH_NR_GPIOS is somewhat arbitrary; it usually reflects the sum of - * builtin/SoC GPIOs plus a number of GPIOs on expanders; the latter is - * actually an estimate of a board-specific value. - */ - -#ifndef ARCH_NR_GPIOS -#define ARCH_NR_GPIOS 256 -#endif - -/* - * "valid" GPIO numbers are nonnegative and may be passed to - * setup routines like gpio_request(). only some valid numbers - * can successfully be requested and used. - * - * Invalid GPIO numbers are useful for indicating no-such-GPIO in - * platform data and other tables. - */ - -static inline bool gpio_is_valid(int number) -{ - return number >= 0 && number < ARCH_NR_GPIOS; -} - -struct device; -struct gpio; -struct seq_file; -struct module; -struct device_node; - -/** - * struct gpio_chip - abstract a GPIO controller - * @label: for diagnostics - * @dev: optional device providing the GPIOs - * @owner: helps prevent removal of modules exporting active GPIOs - * @request: optional hook for chip-specific activation, such as - * enabling module power and clock; may sleep - * @free: optional hook for chip-specific deactivation, such as - * disabling module power and clock; may sleep - * @direction_input: configures signal "offset" as input, or returns error - * @get: returns value for signal "offset"; for output signals this - * returns either the value actually sensed, or zero - * @direction_output: configures signal "offset" as output, or returns error - * @set: assigns output value for signal "offset" - * @to_irq: optional hook supporting non-static gpio_to_irq() mappings; - * implementation may not sleep - * @dbg_show: optional routine to show contents in debugfs; default code - * will be used when this is omitted, but custom code can show extra - * state (such as pullup/pulldown configuration). - * @base: identifies the first GPIO number handled by this chip; or, if - * negative during registration, requests dynamic ID allocation. - * @ngpio: the number of GPIOs handled by this controller; the last GPIO - * handled is (base + ngpio - 1). - * @can_sleep: flag must be set iff get()/set() methods sleep, as they - * must while accessing GPIO expander chips over I2C or SPI - * @names: if set, must be an array of strings to use as alternative - * names for the GPIOs in this chip. Any entry in the array - * may be NULL if there is no alias for the GPIO, however the - * array must be @ngpio entries long. A name can include a single printk - * format specifier for an unsigned int. It is substituted by the actual - * number of the gpio. - * - * A gpio_chip can help platforms abstract various sources of GPIOs so - * they can all be accessed through a common programing interface. - * Example sources would be SOC controllers, FPGAs, multifunction - * chips, dedicated GPIO expanders, and so on. - * - * Each chip controls a number of signals, identified in method calls - * by "offset" values in the range 0..(@ngpio - 1). When those signals - * are referenced through calls like gpio_get_value(gpio), the offset - * is calculated by subtracting @base from the gpio number. - */ -struct gpio_chip { - const char *label; - struct device *dev; - struct module *owner; - - int (*request)(struct gpio_chip *chip, - unsigned offset); - void (*free)(struct gpio_chip *chip, - unsigned offset); - - int (*direction_input)(struct gpio_chip *chip, - unsigned offset); - int (*get)(struct gpio_chip *chip, - unsigned offset); - int (*direction_output)(struct gpio_chip *chip, - unsigned offset, int value); - int (*set_debounce)(struct gpio_chip *chip, - unsigned offset, unsigned debounce); - - void (*set)(struct gpio_chip *chip, - unsigned offset, int value); - - int (*to_irq)(struct gpio_chip *chip, - unsigned offset); - - void (*dbg_show)(struct seq_file *s, - struct gpio_chip *chip); - int base; - u16 ngpio; - const char *const *names; - unsigned can_sleep:1; - unsigned exported:1; - -#if defined(CONFIG_OF_GPIO) - /* - * If CONFIG_OF is enabled, then all GPIO controllers described in the - * device tree automatically may have an OF translation - */ - struct device_node *of_node; - int of_gpio_n_cells; - int (*of_xlate)(struct gpio_chip *gc, - const struct of_phandle_args *gpiospec, u32 *flags); -#endif -}; - -extern const char *gpiochip_is_requested(struct gpio_chip *chip, - unsigned offset); -extern struct gpio_chip *gpio_to_chip(unsigned gpio); -extern int __must_check gpiochip_reserve(int start, int ngpio); - -/* add/remove chips */ -extern int gpiochip_add(struct gpio_chip *chip); -extern int __must_check gpiochip_remove(struct gpio_chip *chip); -extern struct gpio_chip *gpiochip_find(const void *data, - int (*match)(struct gpio_chip *chip, - const void *data)); - - -/* Always use the library code for GPIO management calls, - * or when sleeping may be involved. - */ -extern int gpio_request(unsigned gpio, const char *label); -extern void gpio_free(unsigned gpio); -extern int gpio_re_enabled(unsigned gpio); - -extern int gpio_direction_input(unsigned gpio); -extern int gpio_direction_output(unsigned gpio, int value); - -extern int gpio_set_debounce(unsigned gpio, unsigned debounce); - -extern int gpio_get_value_cansleep(unsigned gpio); -extern void gpio_set_value_cansleep(unsigned gpio, int value); - - -/* A platform's <asm/gpio.h> code may want to inline the I/O calls when - * the GPIO is constant and refers to some always-present controller, - * giving direct access to chip registers and tight bitbanging loops. - */ -extern int __gpio_get_value(unsigned gpio); -extern void __gpio_set_value(unsigned gpio, int value); - -extern int __gpio_cansleep(unsigned gpio); - -extern int __gpio_to_irq(unsigned gpio); - -extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *label); -extern int gpio_request_array(const struct gpio *array, size_t num); -extern void gpio_free_array(const struct gpio *array, size_t num); - -/* bindings for managed devices that want to request gpios */ -int devm_gpio_request(struct device *dev, unsigned gpio, const char *label); -void devm_gpio_free(struct device *dev, unsigned int gpio); - -#ifdef CONFIG_GPIO_SYSFS - -/* - * A sysfs interface can be exported by individual drivers if they want, - * but more typically is configured entirely from userspace. - */ -extern int gpio_export(unsigned gpio, bool direction_may_change); -extern int gpio_export_link(struct device *dev, const char *name, - unsigned gpio); -extern int gpio_sysfs_set_active_low(unsigned gpio, int value); -extern void gpio_unexport(unsigned gpio); - -#endif /* CONFIG_GPIO_SYSFS */ - -#else /* !CONFIG_GPIOLIB */ - -static inline bool gpio_is_valid(int number) -{ - /* only non-negative numbers are valid */ - return number >= 0; -} - -/* platforms that don't directly support access to GPIOs through I2C, SPI, - * or other blocking infrastructure can use these wrappers. - */ - -static inline int gpio_cansleep(unsigned gpio) -{ - return 0; -} - -static inline int gpio_get_value_cansleep(unsigned gpio) -{ - might_sleep(); - return __gpio_get_value(gpio); -} - -static inline void gpio_set_value_cansleep(unsigned gpio, int value) -{ - might_sleep(); - __gpio_set_value(gpio, value); -} - -#endif /* !CONFIG_GPIOLIB */ - -#ifndef CONFIG_GPIO_SYSFS - -struct device; - -/* sysfs support is only available with gpiolib, where it's optional */ - -static inline int gpio_export(unsigned gpio, bool direction_may_change) -{ - return -ENOSYS; -} - -static inline int gpio_export_link(struct device *dev, const char *name, - unsigned gpio) -{ - return -ENOSYS; -} - -static inline int gpio_sysfs_set_active_low(unsigned gpio, int value) -{ - return -ENOSYS; -} - -static inline void gpio_unexport(unsigned gpio) -{ -} -#endif /* CONFIG_GPIO_SYSFS */ - -#endif /* _ASM_GENERIC_GPIO_H */ |