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 #include <linux/pm.h> 26 27 28 struct sys_device; 29 30 struct sysdev_class { 31 struct list_head drivers; 32 33 /* Default operations for these types of devices */ 34 int (*shutdown)(struct sys_device *); 35 int (*suspend)(struct sys_device *, pm_message_t state); 36 int (*resume)(struct sys_device *); 37 struct kset kset; 38 }; 39 40 struct sysdev_class_attribute { 41 struct attribute attr; 42 ssize_t (*show)(struct sysdev_class *, char *); 43 ssize_t (*store)(struct sysdev_class *, const char *, size_t); 44 }; 45 46 #define SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) \ 47 struct sysdev_class_attribute attr_##_name = { \ 48 .attr = {.name = __stringify(_name), .mode = _mode }, \ 49 .show = _show, \ 50 .store = _store, \ 51 }; 52 53 54 extern int sysdev_class_register(struct sysdev_class *); 55 extern void sysdev_class_unregister(struct sysdev_class *); 56 57 extern int sysdev_class_create_file(struct sysdev_class *, 58 struct sysdev_class_attribute *); 59 extern void sysdev_class_remove_file(struct sysdev_class *, 60 struct sysdev_class_attribute *); 61 /** 62 * Auxillary system device drivers. 63 */ 64 65 struct sysdev_driver { 66 struct list_head entry; 67 int (*add)(struct sys_device *); 68 int (*remove)(struct sys_device *); 69 int (*shutdown)(struct sys_device *); 70 int (*suspend)(struct sys_device *, pm_message_t state); 71 int (*resume)(struct sys_device *); 72 }; 73 74 75 extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *); 76 extern void sysdev_driver_unregister(struct sysdev_class *, struct sysdev_driver *); 77 78 79 /** 80 * sys_devices can be simplified a lot from regular devices, because they're 81 * simply not as versatile. 82 */ 83 84 struct sys_device { 85 u32 id; 86 struct sysdev_class * cls; 87 struct kobject kobj; 88 }; 89 90 extern int sysdev_register(struct sys_device *); 91 extern void sysdev_unregister(struct sys_device *); 92 93 94 struct sysdev_attribute { 95 struct attribute attr; 96 ssize_t (*show)(struct sys_device *, char *); 97 ssize_t (*store)(struct sys_device *, const char *, size_t); 98 }; 99 100 101 #define SYSDEV_ATTR(_name,_mode,_show,_store) \ 102 struct sysdev_attribute attr_##_name = { \ 103 .attr = {.name = __stringify(_name), .mode = _mode }, \ 104 .show = _show, \ 105 .store = _store, \ 106 }; 107 108 extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *); 109 extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *); 110 111 #endif /* _SYSDEV_H_ */ 112