#ifndef __LINUX_GPIO_DRIVER_H
#define __LINUX_GPIO_DRIVER_H

#include <linux/device.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/lockdep.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/kconfig.h>

struct gpio_desc;
struct of_phandle_args;
struct device_node;
struct seq_file;
struct gpio_device;

#ifdef CONFIG_GPIOLIB

/**
 * enum single_ended_mode - mode for single ended operation
 * @LINE_MODE_PUSH_PULL: normal mode for a GPIO line, drive actively high/low
 * @LINE_MODE_OPEN_DRAIN: set line to be open drain
 * @LINE_MODE_OPEN_SOURCE: set line to be open source
 */
enum single_ended_mode {
        LINE_MODE_PUSH_PULL,
        LINE_MODE_OPEN_DRAIN,
        LINE_MODE_OPEN_SOURCE,
};

/**
 * struct gpio_chip - abstract a GPIO controller
 * @label: a functional name for the GPIO device, such as a part
 *      number or the name of the SoC IP-block implementing it.
 * @gpiodev: the internal state holder, opaque struct
 * @parent: optional parent 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
 * @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", 0=low, 1=high, or negative error
 * @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
 * @set_single_ended: optional hook for setting a line as open drain, open
 *      source, or non-single ended (restore from open drain/source to normal
 *      push-pull mode) this should be implemented if the hardware supports
 *      open drain or open source settings. The GPIOlib will otherwise try
 *      to emulate open drain/source by not actively driving lines high/low
 *      if a consumer request this. The driver may return -ENOTSUPP if e.g.
 *      it supports just open drain but not open source and is called
 *      with LINE_MODE_OPEN_SOURCE as mode argument.
 * @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.
 *      DEPRECATION: providing anything non-negative and nailing the base
 *      offset of GPIO chips is deprecated. Please pass -1 as base to
 *      let gpiolib select the chip base in all possible cases. We want to
 *      get rid of the static GPIO number space in the long run.
 * @ngpio: the number of GPIOs handled by this controller; the last GPIO
 *      handled is (base + ngpio - 1).
 * @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.
 * @irq_not_threaded: flag must be set if @can_sleep is set but the
 *      IRQs don't need to be threaded
 * @read_reg: reader function for generic GPIO
 * @write_reg: writer function for generic GPIO
 * @pin2mask: some generic GPIO controllers work with the big-endian bits
 *      notation, e.g. in a 8-bits register, GPIO7 is the least significant
 *      bit. This callback assigns the right bit mask.
 * @reg_dat: data (in) register for generic GPIO
 * @reg_set: output set register (out=high) for generic GPIO
 * @reg_clk: output clear register (out=low) for generic GPIO
 * @reg_dir: direction setting register for generic GPIO
 * @bgpio_bits: number of register bits used for a generic GPIO i.e.
 *      <register width> * 8
 * @bgpio_lock: used to lock chip->bgpio_data. Also, this is needed to keep
 *      shadowed and real data registers writes together.
 * @bgpio_data: shadowed data register for generic GPIO to clear/set bits
 *      safely.
 * @bgpio_dir: shadowed direction register for generic GPIO to clear/set
 *      direction safely.
 * @irqchip: GPIO IRQ chip impl, provided by GPIO driver
 * @irqdomain: Interrupt translation domain; responsible for mapping
 *      between GPIO hwirq number and linux irq number
 * @irq_base: first linux IRQ number assigned to GPIO IRQ chip (deprecated)
 * @irq_handler: the irq handler to use (often a predefined irq core function)
 *      for GPIO IRQs, provided by GPIO driver
 * @irq_default_type: default IRQ triggering type applied during GPIO driver
 *      initialization, provided by GPIO driver
 * @irq_parent: GPIO IRQ chip parent/bank linux irq number,
 *      provided by GPIO driver
 * @lock_key: per GPIO IRQ chip lockdep class
 *
 * 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 gpio_device      *gpiodev;
        struct device           *parent;
        struct module           *owner;

        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                     (*set_single_ended)(struct gpio_chip *chip,
                                                unsigned offset,
                                                enum single_ended_mode mode);

        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;
        bool                    can_sleep;
        bool                    irq_not_threaded;

#if IS_ENABLED(CONFIG_GPIO_GENERIC)
        unsigned long (*read_reg)(void __iomem *reg);
        void (*write_reg)(void __iomem *reg, unsigned long data);
        unsigned long (*pin2mask)(struct gpio_chip *gc, unsigned int pin);
        void __iomem *reg_dat;
        void __iomem *reg_set;
        void __iomem *reg_clr;
        void __iomem *reg_dir;
        int bgpio_bits;
        spinlock_t bgpio_lock;
        unsigned long bgpio_data;
        unsigned long bgpio_dir;
#endif

#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;
        int                     irq_parent;
        struct lock_class_key   *lock_key;
#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
};

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

/* add/remove chips */
extern int gpiochip_add_data(struct gpio_chip *chip, void *data);
static inline int gpiochip_add(struct gpio_chip *chip)
{
        return gpiochip_add_data(chip, NULL);
}
extern void gpiochip_remove(struct gpio_chip *chip);
extern int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip,
                                  void *data);
extern void devm_gpiochip_remove(struct device *dev, 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);
bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset);

/* Line status inquiry for drivers */
bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset);
bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset);

/* get driver data */
void *gpiochip_get_data(struct gpio_chip *chip);

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

struct bgpio_pdata {
        const char *label;
        int base;
        int ngpio;
};

#if IS_ENABLED(CONFIG_GPIO_GENERIC)

int bgpio_init(struct gpio_chip *gc, struct device *dev,
               unsigned long sz, void __iomem *dat, void __iomem *set,
               void __iomem *clr, void __iomem *dirout, void __iomem *dirin,
               unsigned long flags);

#define BGPIOF_BIG_ENDIAN               BIT(0)
#define BGPIOF_UNREADABLE_REG_SET       BIT(1) /* reg_set is unreadable */
#define BGPIOF_UNREADABLE_REG_DIR       BIT(2) /* reg_dir is unreadable */
#define BGPIOF_BIG_ENDIAN_BYTE_ORDER    BIT(3)
#define BGPIOF_READ_OUTPUT_REG_SET      BIT(4) /* reg_set stores output value */
#define BGPIOF_NO_OUTPUT                BIT(5) /* only input */

#endif

#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,
                          struct lock_class_key *lock_key);

#ifdef CONFIG_LOCKDEP
#define gpiochip_irqchip_add(...)                               \
(                                                               \
        ({                                                      \
                static struct lock_class_key _key;              \
                _gpiochip_irqchip_add(__VA_ARGS__, &_key);      \
        })                                                      \
)
#else
#define gpiochip_irqchip_add(...)                               \
        _gpiochip_irqchip_add(__VA_ARGS__, NULL)
#endif

#endif /* CONFIG_GPIOLIB_IRQCHIP */

int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset);
void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset);

#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