root/include/linux/isa.h

INCLUDED FROM

DEFINITIONS

1. isa_register_driver
2. isa_unregister_driver

   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 
  13 struct 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
  28 int isa_register_driver(struct isa_driver *, unsigned int);
  29 void isa_unregister_driver(struct isa_driver *);
  30 #else
  31 static inline int isa_register_driver(struct isa_driver *d, unsigned int i)
  32 {
  33         return -ENODEV;
  34 }
  35 
  36 static 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) \
  51 static int __init __isa_driver##_init(void) \
  52 { \
  53         return isa_register_driver(&(__isa_driver), __num_isa_dev); \
  54 } \
  55 module_init(__isa_driver##_init); \
  56 static void __exit __isa_driver##_exit(void) \
  57 { \
  58         isa_unregister_driver(&(__isa_driver)); \
  59 } \
  60 module_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 */