| 1 | /** |
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| 2 | * System devices follow a slightly different driver model. |
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| 3 | * They don't need to do dynammic driver binding, can't be probed, |
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| 4 | * and don't reside on any type of peripheral bus. |
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| 5 | * So, we represent and treat them a little differently. |
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| 6 | * |
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| 7 | * We still have a notion of a driver for a system device, because we still |
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| 8 | * want to perform basic operations on these devices. |
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| 9 | * |
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| 10 | * We also support auxillary drivers binding to devices of a certain class. |
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| 11 | * |
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| 12 | * This allows configurable drivers to register themselves for devices of |
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| 13 | * a certain type. And, it allows class definitions to reside in generic |
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| 14 | * code while arch-specific code can register specific drivers. |
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| 15 | * |
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| 16 | * Auxillary drivers registered with a NULL cls are registered as drivers |
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| 17 | * for all system devices, and get notification calls for each device. |
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| 18 | */ |
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| 19 | |
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| 20 | |
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| 21 | #ifndef _SYSDEV_H_ |
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| 22 | #define _SYSDEV_H_ |
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| 23 | |
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| 24 | #include <asm/types.h> |
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| 25 | |
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| 26 | #include <linux/kobject.h> |
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| 27 | |
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| 28 | |
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| 29 | struct sys_device; |
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| 30 | |
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| 31 | struct sysdev_class { |
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| 32 | struct list_head drivers; |
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| 33 | |
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| 34 | /* Default operations for these types of devices */ |
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| 35 | int (*shutdown)(struct sys_device *); |
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| 36 | int (*suspend)(struct sys_device *, pm_message_t state); |
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| 37 | int (*resume)(struct sys_device *); |
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| 38 | struct kset kset; |
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| 39 | }; |
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| 40 | |
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| 41 | |
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| 42 | extern int sysdev_class_register(struct sysdev_class *); |
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| 43 | extern void sysdev_class_unregister(struct sysdev_class *); |
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| 44 | |
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| 45 | |
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| 46 | /** |
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| 47 | * Auxillary system device drivers. |
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| 48 | */ |
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| 49 | |
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| 50 | struct sysdev_driver { |
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| 51 | struct list_head entry; |
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| 52 | int (*add)(struct sys_device *); |
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| 53 | int (*remove)(struct sys_device *); |
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| 54 | int (*shutdown)(struct sys_device *); |
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| 55 | int (*suspend)(struct sys_device *, pm_message_t state); |
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| 56 | int (*resume)(struct sys_device *); |
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| 57 | }; |
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| 58 | |
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| 59 | |
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| 60 | extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *); |
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| 61 | extern void sysdev_driver_unregister(struct sysdev_class *, struct sysdev_driver *); |
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| 62 | |
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| 63 | |
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| 64 | /** |
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| 65 | * sys_devices can be simplified a lot from regular devices, because they're |
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| 66 | * simply not as versatile. |
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| 67 | */ |
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| 68 | |
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| 69 | struct sys_device { |
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| 70 | __u32 id; |
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| 71 | struct sysdev_class * cls; |
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| 72 | struct kobject kobj; |
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| 73 | }; |
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| 74 | |
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| 75 | extern int sysdev_register(struct sys_device *); |
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| 76 | extern void sysdev_unregister(struct sys_device *); |
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| 77 | |
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| 78 | |
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| 79 | struct sysdev_attribute { |
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| 80 | struct attribute attr; |
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| 81 | ssize_t (*show)(struct sys_device *, char *); |
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| 82 | ssize_t (*store)(struct sys_device *, const char *, size_t); |
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| 83 | }; |
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| 84 | |
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| 85 | |
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| 86 | #define SYSDEV_ATTR(_name,_mode,_show,_store) \ |
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| 87 | struct sysdev_attribute attr_##_name = { \ |
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| 88 | .attr = {.name = __stringify(_name), .mode = _mode }, \ |
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| 89 | .show = _show, \ |
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| 90 | .store = _store, \ |
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| 91 | }; |
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| 92 | |
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| 93 | extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *); |
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| 94 | extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *); |
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| 95 | |
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| 96 | #endif /* _SYSDEV_H_ */ |
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