#ifndef __LINUX_GPIO_DRIVER_H
#define __LINUX_GPIO_DRIVER_H

#include <linux/types.h>
#include <linux/module.h>
#include <linux/irq.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
#include <linux/pinctrl/pinctrl.h>

struct device;
struct gpio_desc;
struct of_phandle_args;
struct device_node;
struct seq_file;

#ifdef CONFIG_GPIOLIB

/**
 * 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
 * @list: links gpio_chips together for traversal
 * @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
 * @get_direction: returns direction for signal "offset", 0=out, 1=in,
 *      (same as GPIOF_DIR_XXX), or negative error
 * @direction_input: configures signal "offset" as input, or returns error
 * @direction_output: configures signal "offset" as output, or returns error
 * @get: returns value for signal "offset"; for output signals this
 *      returns either the value actually sensed, or zero
 * @set: assigns output value for signal "offset"
 * @set_multiple: assigns output values for multiple signals defined by "mask"
 * @set_debounce: optional hook for setting debounce time for specified gpio in
 *      interrupt triggered gpio chips
 * @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).
 * @desc: array of ngpio descriptors. Private.
 * @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.
 * @can_sleep: flag must be set iff get()/set() methods sleep, as they
 *      must while accessing GPIO expander chips over I2C or SPI. This
 *      implies that if the chip supports IRQs, these IRQs need to be threaded
 *      as the chip access may sleep when e.g. reading out the IRQ status
 *      registers.
 * @exported: flags if the gpiochip is exported for use from sysfs. Private.
 * @irq_not_threaded: flag must be set if @can_sleep is set but the
 *      IRQs don't need to be threaded
 *
 * 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;
        struct list_head        list;

        int                     (*request)(struct gpio_chip *chip,
                                                unsigned offset);
        void                    (*free)(struct gpio_chip *chip,
                                                unsigned offset);
        int                     (*get_direction)(struct gpio_chip *chip,
                                                unsigned offset);
        int                     (*direction_input)(struct gpio_chip *chip,
                                                unsigned offset);
        int                     (*direction_output)(struct gpio_chip *chip,
                                                unsigned offset, int value);
        int                     (*get)(struct gpio_chip *chip,
                                                unsigned offset);
        void                    (*set)(struct gpio_chip *chip,
                                                unsigned offset, int value);
        void                    (*set_multiple)(struct gpio_chip *chip,
                                                unsigned long *mask,
                                                unsigned long *bits);
        int                     (*set_debounce)(struct gpio_chip *chip,
                                                unsigned offset,
                                                unsigned debounce);

        int                     (*to_irq)(struct gpio_chip *chip,
                                                unsigned offset);

        void                    (*dbg_show)(struct seq_file *s,
                                                struct gpio_chip *chip);
        int                     base;
        u16                     ngpio;
        struct gpio_desc        *desc;
        const char              *const *names;
        bool                    can_sleep;
        bool                    irq_not_threaded;
        bool                    exported;

#ifdef CONFIG_GPIOLIB_IRQCHIP
        /*
         * With CONFIG_GPIOLIB_IRQCHIP we get an irqchip inside the gpiolib
         * to handle IRQs for most practical cases.
         */
        struct irq_chip         *irqchip;
        struct irq_domain       *irqdomain;
        unsigned int            irq_base;
        irq_flow_handler_t      irq_handler;
        unsigned int            irq_default_type;
#endif

#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
#ifdef CONFIG_PINCTRL
        /*
         * If CONFIG_PINCTRL is enabled, then gpio controllers can optionally
         * describe the actual pin range which they serve in an SoC. This
         * information would be used by pinctrl subsystem to configure
         * corresponding pins for gpio usage.
         */
        struct list_head pin_ranges;
#endif
};

extern const char *gpiochip_is_requested(struct gpio_chip *chip,
                        unsigned offset);

/* add/remove chips */
extern int gpiochip_add(struct gpio_chip *chip);
extern void gpiochip_remove(struct gpio_chip *chip);
extern struct gpio_chip *gpiochip_find(void *data,
                              int (*match)(struct gpio_chip *chip, void *data));

/* lock/unlock as IRQ */
int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset);
void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset);

struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc);

#ifdef CONFIG_GPIOLIB_IRQCHIP

void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip,
                struct irq_chip *irqchip,
                int parent_irq,
                irq_flow_handler_t parent_handler);

int gpiochip_irqchip_add(struct gpio_chip *gpiochip,
                struct irq_chip *irqchip,
                unsigned int first_irq,
                irq_flow_handler_t handler,
                unsigned int type);

#endif /* CONFIG_GPIOLIB_IRQCHIP */

#ifdef CONFIG_PINCTRL

/**
 * struct gpio_pin_range - pin range controlled by a gpio chip
 * @head: list for maintaining set of pin ranges, used internally
 * @pctldev: pinctrl device which handles corresponding pins
 * @range: actual range of pins controlled by a gpio controller
 */

struct gpio_pin_range {
        struct list_head node;
        struct pinctrl_dev *pctldev;
        struct pinctrl_gpio_range range;
};

int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
                           unsigned int gpio_offset, unsigned int pin_offset,
                           unsigned int npins);
int gpiochip_add_pingroup_range(struct gpio_chip *chip,
                        struct pinctrl_dev *pctldev,
                        unsigned int gpio_offset, const char *pin_group);
void gpiochip_remove_pin_ranges(struct gpio_chip *chip);

#else

static inline int
gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
                       unsigned int gpio_offset, unsigned int pin_offset,
                       unsigned int npins)
{
        return 0;
}
static inline int
gpiochip_add_pingroup_range(struct gpio_chip *chip,
                        struct pinctrl_dev *pctldev,
                        unsigned int gpio_offset, const char *pin_group)
{
        return 0;
}

static inline void
gpiochip_remove_pin_ranges(struct gpio_chip *chip)
{
}

#endif /* CONFIG_PINCTRL */

struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum,
                                            const char *label);
void gpiochip_free_own_desc(struct gpio_desc *desc);

#else /* CONFIG_GPIOLIB */

static inline struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
{
        /* GPIO can never have been requested */
        WARN_ON(1);
        return ERR_PTR(-ENODEV);
}

#endif /* CONFIG_GPIOLIB */

#endif