LXR linux/include/linux/isa.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * ISA bus.
   4 */
   5
   6#ifndef __LINUX_ISA_H
   7#define __LINUX_ISA_H
   8
   9#include <linux/device.h>
  10#include <linux/errno.h>
  11#include <linux/kernel.h>
  12
  13struct isa_driver {
  14        int (*match)(struct device *, unsigned int);
  15        int (*probe)(struct device *, unsigned int);
  16        void (*remove)(struct device *, unsigned int);
  17        void (*shutdown)(struct device *, unsigned int);
  18        int (*suspend)(struct device *, unsigned int, pm_message_t);
  19        int (*resume)(struct device *, unsigned int);
  20
  21        struct device_driver driver;
  22        struct device *devices;
  23};
  24
  25#define to_isa_driver(x) container_of((x), struct isa_driver, driver)
  26
  27#ifdef CONFIG_ISA_BUS_API
  28int isa_register_driver(struct isa_driver *, unsigned int);
  29void isa_unregister_driver(struct isa_driver *);
  30#else
  31static inline int isa_register_driver(struct isa_driver *d, unsigned int i)
  32{
  33        return -ENODEV;
  34}
  35
  36static inline void isa_unregister_driver(struct isa_driver *d)
  37{
  38}
  39#endif
  40
  41/**
  42 * module_isa_driver() - Helper macro for registering a ISA driver
  43 * @__isa_driver: isa_driver struct
  44 * @__num_isa_dev: number of devices to register
  45 *
  46 * Helper macro for ISA drivers which do not do anything special in module
  47 * init/exit. This eliminates a lot of boilerplate code. Each module may only
  48 * use this macro once, and calling it replaces module_init and module_exit.
  49 */
  50#define module_isa_driver(__isa_driver, __num_isa_dev) \
  51static int __init __isa_driver##_init(void) \
  52{ \
  53        return isa_register_driver(&(__isa_driver), __num_isa_dev); \
  54} \
  55module_init(__isa_driver##_init); \
  56static void __exit __isa_driver##_exit(void) \
  57{ \
  58        isa_unregister_driver(&(__isa_driver)); \
  59} \
  60module_exit(__isa_driver##_exit);
  61
  62/**
  63 * max_num_isa_dev() - Maximum possible number registered of an ISA device
  64 * @__ida_dev_ext: ISA device address extent
  65 *
  66 * The highest base address possible for an ISA device is 0x3FF; this results in
  67 * 1024 possible base addresses. Dividing the number of possible base addresses
  68 * by the address extent taken by each device results in the maximum number of
  69 * devices on a system.
  70 */
  71#define max_num_isa_dev(__isa_dev_ext) (1024 / __isa_dev_ext)
  72
  73#endif /* __LINUX_ISA_H */
  74