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5e25db870e
The inline isa_register_driver stub simply allows compilation on systems with CONFIG_ISA disabled; the dummy isa_register_driver does not register an isa_driver at all. The inline isa_register_driver should return -ENODEV to indicate lack of support when attempting to register an isa_driver on such a system with CONFIG_ISA disabled. Cc: Matthew Wilcox <matthew@wil.cx> Reported-by: Sasha Levin <sasha.levin@oracle.com> Tested-by: Ye Xiaolong Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
/*
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* ISA bus.
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*/
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#ifndef __LINUX_ISA_H
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#define __LINUX_ISA_H
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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struct isa_driver {
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int (*match)(struct device *, unsigned int);
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int (*probe)(struct device *, unsigned int);
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int (*remove)(struct device *, unsigned int);
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void (*shutdown)(struct device *, unsigned int);
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int (*suspend)(struct device *, unsigned int, pm_message_t);
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int (*resume)(struct device *, unsigned int);
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struct device_driver driver;
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struct device *devices;
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};
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#define to_isa_driver(x) container_of((x), struct isa_driver, driver)
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#ifdef CONFIG_ISA_BUS_API
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int isa_register_driver(struct isa_driver *, unsigned int);
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void isa_unregister_driver(struct isa_driver *);
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#else
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static inline int isa_register_driver(struct isa_driver *d, unsigned int i)
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{
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return -ENODEV;
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}
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static inline void isa_unregister_driver(struct isa_driver *d)
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{
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}
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#endif
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/**
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* module_isa_driver() - Helper macro for registering a ISA driver
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* @__isa_driver: isa_driver struct
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* @__num_isa_dev: number of devices to register
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*
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* Helper macro for ISA drivers which do not do anything special in module
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* init/exit. This eliminates a lot of boilerplate code. Each module may only
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* use this macro once, and calling it replaces module_init and module_exit.
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*/
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#define module_isa_driver(__isa_driver, __num_isa_dev) \
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static int __init __isa_driver##_init(void) \
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{ \
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return isa_register_driver(&(__isa_driver), __num_isa_dev); \
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} \
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module_init(__isa_driver##_init); \
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static void __exit __isa_driver##_exit(void) \
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{ \
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isa_unregister_driver(&(__isa_driver)); \
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} \
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module_exit(__isa_driver##_exit);
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/**
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* max_num_isa_dev() - Maximum possible number registered of an ISA device
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* @__ida_dev_ext: ISA device address extent
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*
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* The highest base address possible for an ISA device is 0x3FF; this results in
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* 1024 possible base addresses. Dividing the number of possible base addresses
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* by the address extent taken by each device results in the maximum number of
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* devices on a system.
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*/
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#define max_num_isa_dev(__isa_dev_ext) (1024 / __isa_dev_ext)
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#endif /* __LINUX_ISA_H */
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