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

#include <linux/device.h>
#include <linux/types.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/pinctrl/pinconf-generic.h>

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

#ifdef CONFIG_GPIOLIB

#ifdef CONFIG_GPIOLIB_IRQCHIP
/**
 * struct gpio_irq_chip - GPIO interrupt controller
 */
struct gpio_irq_chip {
        /**
         * @chip:
         *
         * GPIO IRQ chip implementation, provided by GPIO driver.
         */
        struct irq_chip *chip;

        /**
         * @domain:
         *
         * Interrupt translation domain; responsible for mapping between GPIO
         * hwirq number and Linux IRQ number.
         */
        struct irq_domain *domain;

        /**
         * @domain_ops:
         *
         * Table of interrupt domain operations for this IRQ chip.
         */
        const struct irq_domain_ops *domain_ops;

        /**
         * @handler:
         *
         * The IRQ handler to use (often a predefined IRQ core function) for
         * GPIO IRQs, provided by GPIO driver.
         */
        irq_flow_handler_t handler;

        /**
         * @default_type:
         *
         * Default IRQ triggering type applied during GPIO driver
         * initialization, provided by GPIO driver.
         */
        unsigned int default_type;

        /**
         * @lock_key:
         *
         * Per GPIO IRQ chip lockdep classes.
         */
        struct lock_class_key *lock_key;
        struct lock_class_key *request_key;

        /**
         * @parent_handler:
         *
         * The interrupt handler for the GPIO chip's parent interrupts, may be
         * NULL if the parent interrupts are nested rather than cascaded.
         */
        irq_flow_handler_t parent_handler;

        /**
         * @parent_handler_data:
         *
         * Data associated, and passed to, the handler for the parent
         * interrupt.
         */
        void *parent_handler_data;

        /**
         * @num_parents:
         *
         * The number of interrupt parents of a GPIO chip.
         */
        unsigned int num_parents;

        /**
         * @parents:
         *
         * A list of interrupt parents of a GPIO chip. This is owned by the
         * driver, so the core will only reference this list, not modify it.
         */
        unsigned int *parents;

        /**
         * @map:
         *
         * A list of interrupt parents for each line of a GPIO chip.
         */
        unsigned int *map;

        /**
         * @threaded:
         *
         * True if set the interrupt handling uses nested threads.
         */
        bool threaded;

        /**
         * @need_valid_mask:
         *
         * If set core allocates @valid_mask with all bits set to one.
         */
        bool need_valid_mask;

        /**
         * @valid_mask:
         *
         * If not %NULL holds bitmask of GPIOs which are valid to be included
         * in IRQ domain of the chip.
         */
        unsigned long *valid_mask;

        /**
         * @first:
         *
         * Required for static IRQ allocation. If set, irq_domain_add_simple()
         * will allocate and map all IRQs during initialization.
         */
        unsigned int first;
};

static inline struct gpio_irq_chip *to_gpio_irq_chip(struct irq_chip *chip)
{
        return container_of(chip, struct gpio_irq_chip, chip);
}
#endif

/**
 * 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
 * @get_multiple: reads values for multiple signals defined by "mask" and
 *      stores them in "bits", returns 0 on success or negative error
 * @set: assigns output value for signal "offset"
 * @set_multiple: assigns output values for multiple signals defined by "mask"
 * @set_config: optional hook for all kinds of settings. Uses the same
 *      packed config format as generic pinconf.
 * @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.
 * @read_reg: reader function for generic GPIO
 * @write_reg: writer function for generic GPIO
 * @be_bits: if the generic GPIO has big endian bit order (bit 31 is representing
 *      line 0, bit 30 is line 1 ... bit 0 is line 31) this is set to true by the
 *      generic GPIO core. It is for internal housekeeping only.
 * @reg_dat: data (in) register for generic GPIO
 * @reg_set: output set register (out=high) for generic GPIO
 * @reg_clr: 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.
 *
 * 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);
        int                     (*get_multiple)(struct gpio_chip *chip,
                                                unsigned long *mask,
                                                unsigned long *bits);
        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_config)(struct gpio_chip *chip,
                                              unsigned offset,
                                              unsigned long config);
        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;

#if IS_ENABLED(CONFIG_GPIO_GENERIC)
        unsigned long (*read_reg)(void __iomem *reg);
        void (*write_reg)(void __iomem *reg, unsigned long data);
        bool be_bits;
        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.
         */

        /**
         * @irq:
         *
         * Integrates interrupt chip functionality with the GPIO chip. Can be
         * used to handle IRQs for most practical cases.
         */
        struct gpio_irq_chip irq;
#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
         */

        /**
         * @of_node:
         *
         * Pointer to a device tree node representing this GPIO controller.
         */
        struct device_node *of_node;

        /**
         * @of_gpio_n_cells:
         *
         * Number of cells used to form the GPIO specifier.
         */
        unsigned int of_gpio_n_cells;

        /**
         * @of_xlate:
         *
         * Callback to translate a device tree GPIO specifier into a chip-
         * relative GPIO number and flags.
         */
        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_with_key(struct gpio_chip *chip, void *data,
                                      struct lock_class_key *lock_key,
                                      struct lock_class_key *request_key);

/**
 * gpiochip_add_data() - register a gpio_chip
 * @chip: the chip to register, with chip->base initialized
 * @data: driver-private data associated with this chip
 *
 * Context: potentially before irqs will work
 *
 * When gpiochip_add_data() is called very early during boot, so that GPIOs
 * can be freely used, the chip->parent device must be registered before
 * the gpio framework's arch_initcall().  Otherwise sysfs initialization
 * for GPIOs will fail rudely.
 *
 * gpiochip_add_data() must only be called after gpiolib initialization,
 * ie after core_initcall().
 *
 * If chip->base is negative, this requests dynamic assignment of
 * a range of valid GPIOs.
 *
 * Returns:
 * A negative errno if the chip can't be registered, such as because the
 * chip->base is invalid or already associated with a different chip.
 * Otherwise it returns zero as a success code.
 */
#ifdef CONFIG_LOCKDEP
#define gpiochip_add_data(chip, data) ({                \
                static struct lock_class_key lock_key;  \
                static struct lock_class_key request_key;         \
                gpiochip_add_data_with_key(chip, data, &lock_key, \
                                           &request_key);         \
        })
#else
#define gpiochip_add_data(chip, data) gpiochip_add_data_with_key(chip, data, NULL, NULL)
#endif

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);

/* Sleep persistence inquiry for drivers */
bool gpiochip_line_is_persistent(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

int gpiochip_irq_map(struct irq_domain *d, unsigned int irq,
                     irq_hw_number_t hwirq);
void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq);

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

void gpiochip_set_nested_irqchip(struct gpio_chip *gpiochip,
                struct irq_chip *irqchip,
                unsigned int parent_irq);

int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip,
                             struct irq_chip *irqchip,
                             unsigned int first_irq,
                             irq_flow_handler_t handler,
                             unsigned int type,
                             bool threaded,
                             struct lock_class_key *lock_key,
                             struct lock_class_key *request_key);

bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip,
                                unsigned int offset);

#ifdef CONFIG_LOCKDEP

/*
 * Lockdep requires that each irqchip instance be created with a
 * unique key so as to avoid unnecessary warnings. This upfront
 * boilerplate static inlines provides such a key for each
 * unique instance.
 */
static inline int gpiochip_irqchip_add(struct gpio_chip *gpiochip,
                                       struct irq_chip *irqchip,
                                       unsigned int first_irq,
                                       irq_flow_handler_t handler,
                                       unsigned int type)
{
        static struct lock_class_key lock_key;
        static struct lock_class_key request_key;

        return gpiochip_irqchip_add_key(gpiochip, irqchip, first_irq,
                                        handler, type, false,
                                        &lock_key, &request_key);
}

static inline int gpiochip_irqchip_add_nested(struct gpio_chip *gpiochip,
                          struct irq_chip *irqchip,
                          unsigned int first_irq,
                          irq_flow_handler_t handler,
                          unsigned int type)
{

        static struct lock_class_key lock_key;
        static struct lock_class_key request_key;

        return gpiochip_irqchip_add_key(gpiochip, irqchip, first_irq,
                                        handler, type, true,
                                        &lock_key, &request_key);
}
#else
static inline int gpiochip_irqchip_add(struct gpio_chip *gpiochip,
                                       struct irq_chip *irqchip,
                                       unsigned int first_irq,
                                       irq_flow_handler_t handler,
                                       unsigned int type)
{
        return gpiochip_irqchip_add_key(gpiochip, irqchip, first_irq,
                                        handler, type, false, NULL, NULL);
}

static inline int gpiochip_irqchip_add_nested(struct gpio_chip *gpiochip,
                          struct irq_chip *irqchip,
                          unsigned int first_irq,
                          irq_flow_handler_t handler,
                          unsigned int type)
{
        return gpiochip_irqchip_add_key(gpiochip, irqchip, first_irq,
                                        handler, type, true, NULL, NULL);
}
#endif /* CONFIG_LOCKDEP */

#endif /* CONFIG_GPIOLIB_IRQCHIP */

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

#ifdef CONFIG_PINCTRL

/**
 * struct gpio_pin_range - pin range controlled by a gpio chip
 * @node: 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