include/linux/isa.h

   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 */