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 void (*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 */ 74