| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /** |
| 2 | * System devices follow a slightly different driver model. |
| 3 | * They don't need to do dynammic driver binding, can't be probed, |
| 4 | * and don't reside on any type of peripheral bus. |
| 5 | * So, we represent and treat them a little differently. |
| 6 | * |
| 7 | * We still have a notion of a driver for a system device, because we still |
| 8 | * want to perform basic operations on these devices. |
| 9 | * |
| 10 | * We also support auxillary drivers binding to devices of a certain class. |
| 11 | * |
| 12 | * This allows configurable drivers to register themselves for devices of |
| 13 | * a certain type. And, it allows class definitions to reside in generic |
| 14 | * code while arch-specific code can register specific drivers. |
| 15 | * |
| 16 | * Auxillary drivers registered with a NULL cls are registered as drivers |
| 17 | * for all system devices, and get notification calls for each device. |
| 18 | */ |
| 19 | |
| 20 | |
| 21 | #ifndef _SYSDEV_H_ |
| 22 | #define _SYSDEV_H_ |
| 23 | |
| 24 | #include <linux/kobject.h> |
| 25 | |
| 26 | |
| 27 | struct sys_device; |
| 28 | |
| 29 | struct sysdev_class { |
| 30 | struct list_head drivers; |
| 31 | |
| 32 | /* Default operations for these types of devices */ |
| 33 | int (*shutdown)(struct sys_device *); |
| 34 | int (*suspend)(struct sys_device *, u32 state); |
| 35 | int (*resume)(struct sys_device *); |
| 36 | struct kset kset; |
| 37 | }; |
| 38 | |
| 39 | |
| 40 | extern int sysdev_class_register(struct sysdev_class *); |
| 41 | extern void sysdev_class_unregister(struct sysdev_class *); |
| 42 | |
| 43 | |
| 44 | /** |
| 45 | * Auxillary system device drivers. |
| 46 | */ |
| 47 | |
| 48 | struct sysdev_driver { |
| 49 | struct list_head entry; |
| 50 | int (*add)(struct sys_device *); |
| 51 | int (*remove)(struct sys_device *); |
| 52 | int (*shutdown)(struct sys_device *); |
| 53 | int (*suspend)(struct sys_device *, u32 state); |
| 54 | int (*resume)(struct sys_device *); |
| 55 | }; |
| 56 | |
| 57 | |
| 58 | extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *); |
| 59 | extern void sysdev_driver_unregister(struct sysdev_class *, struct sysdev_driver *); |
| 60 | |
| 61 | |
| 62 | /** |
| 63 | * sys_devices can be simplified a lot from regular devices, because they're |
| 64 | * simply not as versatile. |
| 65 | */ |
| 66 | |
| 67 | struct sys_device { |
| 68 | u32 id; |
| 69 | struct sysdev_class * cls; |
| 70 | struct kobject kobj; |
| 71 | }; |
| 72 | |
| 73 | extern int sysdev_register(struct sys_device *); |
| 74 | extern void sysdev_unregister(struct sys_device *); |
| 75 | |
| 76 | |
| 77 | struct sysdev_attribute { |
| 78 | struct attribute attr; |
| 79 | ssize_t (*show)(struct sys_device *, char *); |
| 80 | ssize_t (*store)(struct sys_device *, const char *, size_t); |
| 81 | }; |
| 82 | |
| 83 | |
| 84 | #define SYSDEV_ATTR(_name,_mode,_show,_store) \ |
| 85 | struct sysdev_attribute attr_##_name = { \ |
| 86 | .attr = {.name = __stringify(_name), .mode = _mode }, \ |
| 87 | .show = _show, \ |
| 88 | .store = _store, \ |
| 89 | }; |
| 90 | |
| 91 | extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *); |
| 92 | extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *); |
| 93 | |
| 94 | #endif /* _SYSDEV_H_ */ |