xref: /linux-6.15/include/linux/isa.h (revision 02469a95)
1 /*
2  * ISA bus.
3  */
4 
5 #ifndef __LINUX_ISA_H
6 #define __LINUX_ISA_H
7 
8 #include <linux/device.h>
9 #include <linux/kernel.h>
10 
11 struct isa_driver {
12 	int (*match)(struct device *, unsigned int);
13 	int (*probe)(struct device *, unsigned int);
14 	int (*remove)(struct device *, unsigned int);
15 	void (*shutdown)(struct device *, unsigned int);
16 	int (*suspend)(struct device *, unsigned int, pm_message_t);
17 	int (*resume)(struct device *, unsigned int);
18 
19 	struct device_driver driver;
20 	struct device *devices;
21 };
22 
23 #define to_isa_driver(x) container_of((x), struct isa_driver, driver)
24 
25 #ifdef CONFIG_ISA
26 int isa_register_driver(struct isa_driver *, unsigned int);
27 void isa_unregister_driver(struct isa_driver *);
28 #else
29 static inline int isa_register_driver(struct isa_driver *d, unsigned int i)
30 {
31 	return 0;
32 }
33 
34 static inline void isa_unregister_driver(struct isa_driver *d)
35 {
36 }
37 #endif
38 
39 /**
40  * module_isa_driver() - Helper macro for registering a ISA driver
41  * @__isa_driver: isa_driver struct
42  * @__num_isa_dev: number of devices to register
43  *
44  * Helper macro for ISA drivers which do not do anything special in module
45  * init/exit. This eliminates a lot of boilerplate code. Each module may only
46  * use this macro once, and calling it replaces module_init and module_exit.
47  */
48 #define module_isa_driver(__isa_driver, __num_isa_dev) \
49 static int __init __isa_driver##_init(void) \
50 { \
51 	return isa_register_driver(&(__isa_driver), __num_isa_dev); \
52 } \
53 module_init(__isa_driver##_init); \
54 static void __exit __isa_driver##_exit(void) \
55 { \
56 	isa_unregister_driver(&(__isa_driver)); \
57 } \
58 module_exit(__isa_driver##_exit);
59 
60 /**
61  * max_num_isa_dev() - Maximum possible number registered of an ISA device
62  * @__ida_dev_ext: ISA device address extent
63  *
64  * The highest base address possible for an ISA device is 0x3FF; this results in
65  * 1024 possible base addresses. Dividing the number of possible base addresses
66  * by the address extent taken by each device results in the maximum number of
67  * devices on a system.
68  */
69 #define max_num_isa_dev(__isa_dev_ext) (1024 / __isa_dev_ext)
70 
71 #endif /* __LINUX_ISA_H */
72