/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_GPIO_CONSUMER_H
#define __LINUX_GPIO_CONSUMER_H

#include <linux/bug.h>
#include <linux/err.h>
#include <linux/kernel.h>

struct device;

/**
 * Opaque descriptor for a GPIO. These are obtained using gpiod_get() and are
 * preferable to the old integer-based handles.
 *
 * Contrary to integers, a pointer to a gpio_desc is guaranteed to be valid
 * until the GPIO is released.
 */
struct gpio_desc;

/**
 * Struct containing an array of descriptors that can be obtained using
 * gpiod_get_array().
 */
struct gpio_descs {
        unsigned int ndescs;
        struct gpio_desc *desc[];
};

#define GPIOD_FLAGS_BIT_DIR_SET         BIT(0)
#define GPIOD_FLAGS_BIT_DIR_OUT         BIT(1)
#define GPIOD_FLAGS_BIT_DIR_VAL         BIT(2)

/**
 * Optional flags that can be passed to one of gpiod_* to configure direction
 * and output value. These values cannot be OR'd.
 */
enum gpiod_flags {
        GPIOD_ASIS      = 0,
        GPIOD_IN        = GPIOD_FLAGS_BIT_DIR_SET,
        GPIOD_OUT_LOW   = GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT,
        GPIOD_OUT_HIGH  = GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
                          GPIOD_FLAGS_BIT_DIR_VAL,
};

#ifdef CONFIG_GPIOLIB

/* Return the number of GPIOs associated with a device / function */
int gpiod_count(struct device *dev, const char *con_id);

/* Acquire and dispose GPIOs */
struct gpio_desc *__must_check gpiod_get(struct device *dev,
                                         const char *con_id,
                                         enum gpiod_flags flags);
struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
                                               const char *con_id,
                                               unsigned int idx,
                                               enum gpiod_flags flags);
struct gpio_desc *__must_check gpiod_get_optional(struct device *dev,
                                                  const char *con_id,
                                                  enum gpiod_flags flags);
struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev,
                                                        const char *con_id,
                                                        unsigned int index,
                                                        enum gpiod_flags flags);
struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
                                                const char *con_id,
                                                enum gpiod_flags flags);
struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev,
                                                        const char *con_id,
                                                        enum gpiod_flags flags);
void gpiod_put(struct gpio_desc *desc);
void gpiod_put_array(struct gpio_descs *descs);

struct gpio_desc *__must_check devm_gpiod_get(struct device *dev,
                                              const char *con_id,
                                              enum gpiod_flags flags);
struct gpio_desc *__must_check devm_gpiod_get_index(struct device *dev,
                                                    const char *con_id,
                                                    unsigned int idx,
                                                    enum gpiod_flags flags);
struct gpio_desc *__must_check devm_gpiod_get_optional(struct device *dev,
                                                       const char *con_id,
                                                       enum gpiod_flags flags);
struct gpio_desc *__must_check
devm_gpiod_get_index_optional(struct device *dev, const char *con_id,
                              unsigned int index, enum gpiod_flags flags);
struct gpio_descs *__must_check devm_gpiod_get_array(struct device *dev,
                                                     const char *con_id,
                                                     enum gpiod_flags flags);
struct gpio_descs *__must_check
devm_gpiod_get_array_optional(struct device *dev, const char *con_id,
                              enum gpiod_flags flags);
void devm_gpiod_put(struct device *dev, struct gpio_desc *desc);
void devm_gpiod_put_array(struct device *dev, struct gpio_descs *descs);

int gpiod_get_direction(struct gpio_desc *desc);
int gpiod_direction_input(struct gpio_desc *desc);
int gpiod_direction_output(struct gpio_desc *desc, int value);
int gpiod_direction_output_raw(struct gpio_desc *desc, int value);

/* Value get/set from non-sleeping context */
int gpiod_get_value(const struct gpio_desc *desc);
void gpiod_set_value(struct gpio_desc *desc, int value);
void gpiod_set_array_value(unsigned int array_size,
                           struct gpio_desc **desc_array, int *value_array);
int gpiod_get_raw_value(const struct gpio_desc *desc);
void gpiod_set_raw_value(struct gpio_desc *desc, int value);
void gpiod_set_raw_array_value(unsigned int array_size,
                               struct gpio_desc **desc_array,
                               int *value_array);

/* Value get/set from sleeping context */
int gpiod_get_value_cansleep(const struct gpio_desc *desc);
void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
void gpiod_set_array_value_cansleep(unsigned int array_size,
                                    struct gpio_desc **desc_array,
                                    int *value_array);
int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
                                        struct gpio_desc **desc_array,
                                        int *value_array);

int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);

int gpiod_is_active_low(const struct gpio_desc *desc);
int gpiod_cansleep(const struct gpio_desc *desc);

int gpiod_to_irq(const struct gpio_desc *desc);

/* Convert between the old gpio_ and new gpiod_ interfaces */
struct gpio_desc *gpio_to_desc(unsigned gpio);
int desc_to_gpio(const struct gpio_desc *desc);

/* Child properties interface */
struct fwnode_handle;

struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
                                         const char *propname, int index,
                                         enum gpiod_flags dflags,
                                         const char *label);
struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
                                                const char *con_id, int index,
                                                struct fwnode_handle *child,
                                                enum gpiod_flags flags,
                                                const char *label);

#else /* CONFIG_GPIOLIB */

static inline int gpiod_count(struct device *dev, const char *con_id)
{
        return 0;
}

static inline struct gpio_desc *__must_check gpiod_get(struct device *dev,
                                                       const char *con_id,
                                                       enum gpiod_flags flags)
{
        return ERR_PTR(-ENOSYS);
}
static inline struct gpio_desc *__must_check
gpiod_get_index(struct device *dev,
                const char *con_id,
                unsigned int idx,
                enum gpiod_flags flags)
{
        return ERR_PTR(-ENOSYS);
}

static inline struct gpio_desc *__must_check
gpiod_get_optional(struct device *dev, const char *con_id,
                   enum gpiod_flags flags)
{
        return NULL;
}

static inline struct gpio_desc *__must_check
gpiod_get_index_optional(struct device *dev, const char *con_id,
                         unsigned int index, enum gpiod_flags flags)
{
        return NULL;
}

static inline struct gpio_descs *__must_check
gpiod_get_array(struct device *dev, const char *con_id,
                enum gpiod_flags flags)
{
        return ERR_PTR(-ENOSYS);
}

static inline struct gpio_descs *__must_check
gpiod_get_array_optional(struct device *dev, const char *con_id,
                         enum gpiod_flags flags)
{
        return NULL;
}

static inline void gpiod_put(struct gpio_desc *desc)
{
        might_sleep();

        /* GPIO can never have been requested */
        WARN_ON(1);
}

static inline void gpiod_put_array(struct gpio_descs *descs)
{
        might_sleep();

        /* GPIO can never have been requested */
        WARN_ON(1);
}

static inline struct gpio_desc *__must_check
devm_gpiod_get(struct device *dev,
                 const char *con_id,
                 enum gpiod_flags flags)
{
        return ERR_PTR(-ENOSYS);
}
static inline
struct gpio_desc *__must_check
devm_gpiod_get_index(struct device *dev,
                       const char *con_id,
                       unsigned int idx,
                       enum gpiod_flags flags)
{
        return ERR_PTR(-ENOSYS);
}

static inline struct gpio_desc *__must_check
devm_gpiod_get_optional(struct device *dev, const char *con_id,
                          enum gpiod_flags flags)
{
        return NULL;
}

static inline struct gpio_desc *__must_check
devm_gpiod_get_index_optional(struct device *dev, const char *con_id,
                                unsigned int index, enum gpiod_flags flags)
{
        return NULL;
}

static inline struct gpio_descs *__must_check
devm_gpiod_get_array(struct device *dev, const char *con_id,
                     enum gpiod_flags flags)
{
        return ERR_PTR(-ENOSYS);
}

static inline struct gpio_descs *__must_check
devm_gpiod_get_array_optional(struct device *dev, const char *con_id,
                              enum gpiod_flags flags)
{
        return NULL;
}

static inline void devm_gpiod_put(struct device *dev, struct gpio_desc *desc)
{
        might_sleep();

        /* GPIO can never have been requested */
        WARN_ON(1);
}

static inline void devm_gpiod_put_array(struct device *dev,
                                        struct gpio_descs *descs)
{
        might_sleep();

        /* GPIO can never have been requested */
        WARN_ON(1);
}


static inline int gpiod_get_direction(const struct gpio_desc *desc)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
        return -ENOSYS;
}
static inline int gpiod_direction_input(struct gpio_desc *desc)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
        return -ENOSYS;
}
static inline int gpiod_direction_output(struct gpio_desc *desc, int value)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
        return -ENOSYS;
}
static inline int gpiod_direction_output_raw(struct gpio_desc *desc, int value)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
        return -ENOSYS;
}


static inline int gpiod_get_value(const struct gpio_desc *desc)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
        return 0;
}
static inline void gpiod_set_value(struct gpio_desc *desc, int value)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
}
static inline void gpiod_set_array_value(unsigned int array_size,
                                         struct gpio_desc **desc_array,
                                         int *value_array)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
}
static inline int gpiod_get_raw_value(const struct gpio_desc *desc)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
        return 0;
}
static inline void gpiod_set_raw_value(struct gpio_desc *desc, int value)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
}
static inline void gpiod_set_raw_array_value(unsigned int array_size,
                                             struct gpio_desc **desc_array,
                                             int *value_array)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
}

static inline int gpiod_get_value_cansleep(const struct gpio_desc *desc)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
        return 0;
}
static inline void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
}
static inline void gpiod_set_array_value_cansleep(unsigned int array_size,
                                            struct gpio_desc **desc_array,
                                            int *value_array)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
}
static inline int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
        return 0;
}
static inline void gpiod_set_raw_value_cansleep(struct gpio_desc *desc,
                                                int value)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
}
static inline void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
                                                struct gpio_desc **desc_array,
                                                int *value_array)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
}

static inline int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
        return -ENOSYS;
}

static inline int gpiod_is_active_low(const struct gpio_desc *desc)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
        return 0;
}
static inline int gpiod_cansleep(const struct gpio_desc *desc)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
        return 0;
}

static inline int gpiod_to_irq(const struct gpio_desc *desc)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
        return -EINVAL;
}

static inline struct gpio_desc *gpio_to_desc(unsigned gpio)
{
        return ERR_PTR(-EINVAL);
}

static inline int desc_to_gpio(const struct gpio_desc *desc)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
        return -EINVAL;
}

/* Child properties interface */
struct fwnode_handle;

static inline
struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
                                         const char *propname, int index,
                                         enum gpiod_flags dflags,
                                         const char *label)
{
        return ERR_PTR(-ENOSYS);
}

static inline
struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
                                                const char *con_id, int index,
                                                struct fwnode_handle *child,
                                                enum gpiod_flags flags,
                                                const char *label)
{
        return ERR_PTR(-ENOSYS);
}

#endif /* CONFIG_GPIOLIB */

static inline
struct gpio_desc *devm_fwnode_get_gpiod_from_child(struct device *dev,
                                                   const char *con_id,
                                                   struct fwnode_handle *child,
                                                   enum gpiod_flags flags,
                                                   const char *label)
{
        return devm_fwnode_get_index_gpiod_from_child(dev, con_id, 0, child,
                                                      flags, label);
}

#if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_GPIO_SYSFS)

int gpiod_export(struct gpio_desc *desc, bool direction_may_change);
int gpiod_export_link(struct device *dev, const char *name,
                      struct gpio_desc *desc);
void gpiod_unexport(struct gpio_desc *desc);

#else  /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */

static inline int gpiod_export(struct gpio_desc *desc,
                               bool direction_may_change)
{
        return -ENOSYS;
}

static inline int gpiod_export_link(struct device *dev, const char *name,
                                    struct gpio_desc *desc)
{
        return -ENOSYS;
}

static inline void gpiod_unexport(struct gpio_desc *desc)
{
}

#endif /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */

#endif