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/module.h> 26#include <linux/pm.h> 27 28 29struct sys_device; 30 31struct sysdev_class { 32 struct list_head drivers; 33 34 /* Default operations for these types of devices */ 35 int (*shutdown)(struct sys_device *); 36 int (*suspend)(struct sys_device *, pm_message_t state); 37 int (*resume)(struct sys_device *); 38 struct kset kset; 39}; 40 41struct sysdev_class_attribute { 42 struct attribute attr; 43 ssize_t (*show)(struct sysdev_class *, char *); 44 ssize_t (*store)(struct sysdev_class *, const char *, size_t); 45}; 46 47#define SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) \ 48struct sysdev_class_attribute attr_##_name = { \ 49 .attr = {.name = __stringify(_name), .mode = _mode }, \ 50 .show = _show, \ 51 .store = _store, \ 52}; 53 54 55extern int sysdev_class_register(struct sysdev_class *); 56extern void sysdev_class_unregister(struct sysdev_class *); 57 58extern int sysdev_class_create_file(struct sysdev_class *, 59 struct sysdev_class_attribute *); 60extern void sysdev_class_remove_file(struct sysdev_class *, 61 struct sysdev_class_attribute *); 62/** 63 * Auxillary system device drivers. 64 */ 65 66struct sysdev_driver { 67 struct list_head entry; 68 int (*add)(struct sys_device *); 69 int (*remove)(struct sys_device *); 70 int (*shutdown)(struct sys_device *); 71 int (*suspend)(struct sys_device *, pm_message_t state); 72 int (*resume)(struct sys_device *); 73}; 74 75 76extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *); 77extern void sysdev_driver_unregister(struct sysdev_class *, struct sysdev_driver *); 78 79 80/** 81 * sys_devices can be simplified a lot from regular devices, because they're 82 * simply not as versatile. 83 */ 84 85struct sys_device { 86 u32 id; 87 struct sysdev_class * cls; 88 struct kobject kobj; 89}; 90 91extern int sysdev_register(struct sys_device *); 92extern void sysdev_unregister(struct sys_device *); 93 94 95struct sysdev_attribute { 96 struct attribute attr; 97 ssize_t (*show)(struct sys_device *, char *); 98 ssize_t (*store)(struct sys_device *, const char *, size_t); 99}; 100 101 102#define _SYSDEV_ATTR(_name,_mode,_show,_store) \ 103{ \ 104 .attr = { .name = __stringify(_name), .mode = _mode, \ 105 .owner = THIS_MODULE }, \ 106 .show = _show, \ 107 .store = _store, \ 108} 109 110#define SYSDEV_ATTR(_name,_mode,_show,_store) \ 111struct sysdev_attribute attr_##_name = _SYSDEV_ATTR(_name,_mode,_show,_store); 112 113extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *); 114extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *); 115 116#endif /* _SYSDEV_H_ */ 117