f23f1516b6
pinctrl subsystem needs gpio chip base to prepare set of gpio pin ranges, which a given pinctrl driver can handle. This is important to handle pinctrl gpio request calls in order to program a given pin properly for gpio operation. As gpio base is allocated dynamically during gpiochip registration, presently there exists no clean way to pass this information to the pinctrl subsystem. After few discussions from [1], it was concluded that may be gpio controller reporting the pin range it supports, is a better way than pinctrl subsystem directly registering it. [1] http://comments.gmane.org/gmane.linux.ports.arm.kernel/184816 Cc: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com> [Edited documentation a bit] Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
240 lines
4.8 KiB
C
240 lines
4.8 KiB
C
#ifndef __LINUX_GPIO_H
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#define __LINUX_GPIO_H
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#include <linux/errno.h>
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/* see Documentation/gpio.txt */
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/* make these flag values available regardless of GPIO kconfig options */
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#define GPIOF_DIR_OUT (0 << 0)
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#define GPIOF_DIR_IN (1 << 0)
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#define GPIOF_INIT_LOW (0 << 1)
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#define GPIOF_INIT_HIGH (1 << 1)
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#define GPIOF_IN (GPIOF_DIR_IN)
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#define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT | GPIOF_INIT_LOW)
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#define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT | GPIOF_INIT_HIGH)
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/* Gpio pin is open drain */
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#define GPIOF_OPEN_DRAIN (1 << 2)
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/* Gpio pin is open source */
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#define GPIOF_OPEN_SOURCE (1 << 3)
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#define GPIOF_EXPORT (1 << 4)
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#define GPIOF_EXPORT_CHANGEABLE (1 << 5)
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#define GPIOF_EXPORT_DIR_FIXED (GPIOF_EXPORT)
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#define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE)
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/**
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* struct gpio - a structure describing a GPIO with configuration
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* @gpio: the GPIO number
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* @flags: GPIO configuration as specified by GPIOF_*
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* @label: a literal description string of this GPIO
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*/
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struct gpio {
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unsigned gpio;
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unsigned long flags;
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const char *label;
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};
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#ifdef CONFIG_GENERIC_GPIO
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#ifdef CONFIG_ARCH_HAVE_CUSTOM_GPIO_H
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#include <asm/gpio.h>
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#else
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#include <asm-generic/gpio.h>
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static inline int gpio_get_value(unsigned int gpio)
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{
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return __gpio_get_value(gpio);
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}
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static inline void gpio_set_value(unsigned int gpio, int value)
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{
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__gpio_set_value(gpio, value);
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}
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static inline int gpio_cansleep(unsigned int gpio)
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{
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return __gpio_cansleep(gpio);
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}
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static inline int gpio_to_irq(unsigned int gpio)
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{
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return __gpio_to_irq(gpio);
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}
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static inline int irq_to_gpio(unsigned int irq)
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{
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return -EINVAL;
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}
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#endif
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#else
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/bug.h>
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struct device;
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struct gpio_chip;
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static inline bool gpio_is_valid(int number)
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{
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return false;
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}
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static inline int gpio_request(unsigned gpio, const char *label)
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{
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return -ENOSYS;
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}
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static inline int devm_gpio_request(struct device *dev, unsigned gpio,
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const char *label)
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{
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return -ENOSYS;
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}
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static inline int gpio_request_one(unsigned gpio,
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unsigned long flags, const char *label)
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{
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return -ENOSYS;
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}
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static inline int devm_gpio_request_one(struct device *dev, unsigned gpio,
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unsigned long flags, const char *label)
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{
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return -ENOSYS;
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}
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static inline int gpio_request_array(const struct gpio *array, size_t num)
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{
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return -ENOSYS;
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}
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static inline void gpio_free(unsigned gpio)
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{
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might_sleep();
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/* GPIO can never have been requested */
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WARN_ON(1);
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}
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static inline void devm_gpio_free(struct device *dev, unsigned gpio)
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{
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might_sleep();
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/* GPIO can never have been requested */
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WARN_ON(1);
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}
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static inline void gpio_free_array(const struct gpio *array, size_t num)
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{
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might_sleep();
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/* GPIO can never have been requested */
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WARN_ON(1);
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}
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static inline int gpio_direction_input(unsigned gpio)
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{
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return -ENOSYS;
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}
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static inline int gpio_direction_output(unsigned gpio, int value)
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{
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return -ENOSYS;
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}
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static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
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{
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return -ENOSYS;
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}
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static inline int gpio_get_value(unsigned gpio)
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{
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/* GPIO can never have been requested or set as {in,out}put */
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WARN_ON(1);
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return 0;
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}
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static inline void gpio_set_value(unsigned gpio, int value)
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{
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/* GPIO can never have been requested or set as output */
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WARN_ON(1);
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}
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static inline int gpio_cansleep(unsigned gpio)
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{
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/* GPIO can never have been requested or set as {in,out}put */
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WARN_ON(1);
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return 0;
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}
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static inline int gpio_get_value_cansleep(unsigned gpio)
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{
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/* GPIO can never have been requested or set as {in,out}put */
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WARN_ON(1);
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return 0;
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}
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static inline void gpio_set_value_cansleep(unsigned gpio, int value)
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{
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/* GPIO can never have been requested or set as output */
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WARN_ON(1);
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}
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static inline int gpio_export(unsigned gpio, bool direction_may_change)
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{
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/* GPIO can never have been requested or set as {in,out}put */
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WARN_ON(1);
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return -EINVAL;
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}
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static inline int gpio_export_link(struct device *dev, const char *name,
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unsigned gpio)
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{
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/* GPIO can never have been exported */
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WARN_ON(1);
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return -EINVAL;
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}
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static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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return -EINVAL;
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}
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static inline void gpio_unexport(unsigned gpio)
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{
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/* GPIO can never have been exported */
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WARN_ON(1);
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}
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static inline int gpio_to_irq(unsigned gpio)
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{
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/* GPIO can never have been requested or set as input */
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WARN_ON(1);
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return -EINVAL;
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}
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static inline int irq_to_gpio(unsigned irq)
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{
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/* irq can never have been returned from gpio_to_irq() */
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WARN_ON(1);
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return -EINVAL;
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}
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void gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
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unsigned int pin_base, unsigned int npins);
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void gpiochip_remove_pin_ranges(struct gpio_chip *chip);
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#endif
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#endif /* __LINUX_GPIO_H */
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