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include/linux/isa.h
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/* 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);
int (*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;
};
#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
/**
* 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) \
static int __init __isa_driver##_init(void) \
{ \
return isa_register_driver(&(__isa_driver), __num_isa_dev); \
} \
module_init(__isa_driver##_init); \
static void __exit __isa_driver##_exit(void) \
{ \
isa_unregister_driver(&(__isa_driver)); \
} \
module_exit(__isa_driver##_exit);
/**
* 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 */
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