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