diff options
Diffstat (limited to 'include/linux/isa.h')
| -rw-r--r-- | include/linux/isa.h | 37 |
1 files changed, 35 insertions, 2 deletions
diff --git a/include/linux/isa.h b/include/linux/isa.h index b0270e381..f2d025841 100644 --- a/include/linux/isa.h +++ b/include/linux/isa.h @@ -6,6 +6,7 @@ #define __LINUX_ISA_H #include <linux/device.h> +#include <linux/errno.h> #include <linux/kernel.h> struct isa_driver { @@ -22,13 +23,13 @@ struct isa_driver { #define to_isa_driver(x) container_of((x), struct isa_driver, driver) -#ifdef CONFIG_ISA +#ifdef CONFIG_ISA_BUS_API int isa_register_driver(struct isa_driver *, unsigned int); void isa_unregister_driver(struct isa_driver *); #else static inline int isa_register_driver(struct isa_driver *d, unsigned int i) { - return 0; + return -ENODEV; } static inline void isa_unregister_driver(struct isa_driver *d) @@ -36,4 +37,36 @@ static inline void isa_unregister_driver(struct isa_driver *d) } #endif +/** + * module_isa_driver() - Helper macro for registering a ISA driver + * @__isa_driver: isa_driver struct + * @__num_isa_dev: number of devices to register + * + * Helper macro for ISA drivers which do not do anything special in module + * init/exit. This eliminates a lot of boilerplate code. Each module may only + * use this macro once, and calling it replaces module_init and module_exit. + */ +#define module_isa_driver(__isa_driver, __num_isa_dev) \ +static int __init __isa_driver##_init(void) \ +{ \ + return isa_register_driver(&(__isa_driver), __num_isa_dev); \ +} \ +module_init(__isa_driver##_init); \ +static void __exit __isa_driver##_exit(void) \ +{ \ + isa_unregister_driver(&(__isa_driver)); \ +} \ +module_exit(__isa_driver##_exit); + +/** + * max_num_isa_dev() - Maximum possible number registered of an ISA device + * @__ida_dev_ext: ISA device address extent + * + * The highest base address possible for an ISA device is 0x3FF; this results in + * 1024 possible base addresses. Dividing the number of possible base addresses + * by the address extent taken by each device results in the maximum number of + * devices on a system. + */ +#define max_num_isa_dev(__isa_dev_ext) (1024 / __isa_dev_ext) + #endif /* __LINUX_ISA_H */ |