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#define module_isa_driver_init(__isa_driver, __num_isa_dev) \
42static int __init __isa_driver##_init(void) \
43{ \
44 return isa_register_driver(&(__isa_driver), __num_isa_dev); \
45} \
46module_init(__isa_driver##_init)
47
48#define module_isa_driver_with_irq_init(__isa_driver, __num_isa_dev, __num_irq) \
49static int __init __isa_driver##_init(void) \
50{ \
51 if (__num_irq != __num_isa_dev) { \
52 pr_err("%s: Number of irq (%u) does not match number of base (%u)\n", \
53 __isa_driver.driver.name, __num_irq, __num_isa_dev); \
54 return -EINVAL; \
55 } \
56 return isa_register_driver(&(__isa_driver), __num_isa_dev); \
57} \
58module_init(__isa_driver##_init)
59
60#define module_isa_driver_exit(__isa_driver) \
61static void __exit __isa_driver##_exit(void) \
62{ \
63 isa_unregister_driver(&(__isa_driver)); \
64} \
65module_exit(__isa_driver##_exit)
66
67/**
68 * module_isa_driver() - Helper macro for registering a ISA driver
69 * @__isa_driver: isa_driver struct
70 * @__num_isa_dev: number of devices to register
71 *
72 * Helper macro for ISA drivers which do not do anything special in module
73 * init/exit. This eliminates a lot of boilerplate code. Each module may only
74 * use this macro once, and calling it replaces module_init and module_exit.
75 */
76#define module_isa_driver(__isa_driver, __num_isa_dev) \
77module_isa_driver_init(__isa_driver, __num_isa_dev); \
78module_isa_driver_exit(__isa_driver)
79
80/**
81 * module_isa_driver_with_irq() - Helper macro for registering an ISA driver with irq
82 * @__isa_driver: isa_driver struct
83 * @__num_isa_dev: number of devices to register
84 * @__num_irq: number of IRQ to register
85 *
86 * Helper macro for ISA drivers with irq that do not do anything special in
87 * module init/exit. Each module may only use this macro once, and calling it
88 * replaces module_init and module_exit.
89 */
90#define module_isa_driver_with_irq(__isa_driver, __num_isa_dev, __num_irq) \
91module_isa_driver_with_irq_init(__isa_driver, __num_isa_dev, __num_irq); \
92module_isa_driver_exit(__isa_driver)
93
94/**
95 * max_num_isa_dev() - Maximum possible number registered of an ISA device
96 * @__ida_dev_ext: ISA device address extent
97 *
98 * The highest base address possible for an ISA device is 0x3FF; this results in
99 * 1024 possible base addresses. Dividing the number of possible base addresses
100 * by the address extent taken by each device results in the maximum number of
101 * devices on a system.
102 */
103#define max_num_isa_dev(__isa_dev_ext) (1024 / __isa_dev_ext)
104
105#endif /* __LINUX_ISA_H */
106

source code of linux/include/linux/isa.h