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 int (*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