/* SPDX-License-Identifier: GPL-2.0 */
/*
 * ISA bus.
 */

#ifndef __LINUX_ISA_H
#define __LINUX_ISA_H

#include <linux/device.h>
#include <linux/errno.h>
#include <linux/kernel.h>

struct isa_driver {
    int (*match)(struct device *, unsigned int);
    int (*probe)(struct device *, unsigned int);
    void (*remove)(struct device *, unsigned int);
    void (*shutdown)(struct device *, unsigned int);
    int (*suspend)(struct device *, unsigned int, pm_message_t);
    int (*resume)(struct device *, unsigned int);

    struct device_driver driver;
    struct device *devices;
} __mutable_const;

#define to_isa_driver(x) container_of((x), struct isa_driver, driver)

#ifdef CONFIG_ISA_BUS_API
int isa_register_driver(struct isa_driver *, unsigned int);
void isa_unregister_driver(struct isa_driver *);
#else
static inline int isa_register_driver(struct isa_driver *d, unsigned int i)
{
    return -ENODEV;
}

static inline void isa_unregister_driver(struct isa_driver *d)
{
}
#endif

#define module_isa_driver_init(__isa_driver, __num_isa_dev) \
static int __init __isa_driver##_init(void) \
{ \
    return isa_register_driver(&(__isa_driver), __num_isa_dev); \
} \
module_init(__isa_driver##_init)

#define module_isa_driver_with_irq_init(__isa_driver, __num_isa_dev, __num_irq) \
static int __init __isa_driver##_init(void) \
{ \
    if (__num_irq != __num_isa_dev) { \
        pr_err("%s: Number of irq (%u) does not match number of base (%u)\n", \
               __isa_driver.driver.name, __num_irq, __num_isa_dev); \
        return -EINVAL; \
    } \
    return isa_register_driver(&(__isa_driver), __num_isa_dev); \
} \
module_init(__isa_driver##_init)

#define module_isa_driver_exit(__isa_driver) \
static void __exit __isa_driver##_exit(void) \
{ \
    isa_unregister_driver(&(__isa_driver)); \
} \
module_exit(__isa_driver##_exit)

/**
 * module_isa_driver() - Helper macro for registering a ISA driver
 * @__isa_driver: isa_driver struct
 * @__num_isa_dev: number of devices to register
 *
 * Helper macro for ISA drivers which do not do anything special in module
 * init/exit. This eliminates a lot of boilerplate code. Each module may only
 * use this macro once, and calling it replaces module_init and module_exit.
 */
#define module_isa_driver(__isa_driver, __num_isa_dev) \
module_isa_driver_init(__isa_driver, __num_isa_dev); \
module_isa_driver_exit(__isa_driver)

/**
 * module_isa_driver_with_irq() - Helper macro for registering an ISA driver with irq
 * @__isa_driver: isa_driver struct
 * @__num_isa_dev: number of devices to register
 * @__num_irq: number of IRQ to register
 *
 * Helper macro for ISA drivers with irq that do not do anything special in
 * module init/exit. Each module may only use this macro once, and calling it
 * replaces module_init and module_exit.
 */
#define module_isa_driver_with_irq(__isa_driver, __num_isa_dev, __num_irq) \
module_isa_driver_with_irq_init(__isa_driver, __num_isa_dev, __num_irq); \
module_isa_driver_exit(__isa_driver)

/**
 * max_num_isa_dev() - Maximum possible number registered of an ISA device
 * @__ida_dev_ext: ISA device address extent
 *
 * The highest base address possible for an ISA device is 0x3FF; this results in
 * 1024 possible base addresses. Dividing the number of possible base addresses
 * by the address extent taken by each device results in the maximum number of
 * devices on a system.
 */
#define max_num_isa_dev(__isa_dev_ext) (1024 / __isa_dev_ext)

#endif /* __LINUX_ISA_H */