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1da177e4 LT |
1 | /* |
2 | * device.h - generic, centralized driver model | |
3 | * | |
4 | * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org> | |
5 | * | |
6 | * This file is released under the GPLv2 | |
7 | * | |
8 | * See Documentation/driver-model/ for more information. | |
9 | */ | |
10 | ||
11 | #ifndef _DEVICE_H_ | |
12 | #define _DEVICE_H_ | |
13 | ||
14 | #include <linux/config.h> | |
15 | #include <linux/ioport.h> | |
16 | #include <linux/kobject.h> | |
465c7a3a | 17 | #include <linux/klist.h> |
1da177e4 LT |
18 | #include <linux/list.h> |
19 | #include <linux/types.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/pm.h> | |
22 | #include <asm/semaphore.h> | |
23 | #include <asm/atomic.h> | |
24 | ||
25 | #define DEVICE_NAME_SIZE 50 | |
26 | #define DEVICE_NAME_HALF __stringify(20) /* Less than half to accommodate slop */ | |
27 | #define DEVICE_ID_SIZE 32 | |
28 | #define BUS_ID_SIZE KOBJ_NAME_LEN | |
29 | ||
30 | ||
1da177e4 LT |
31 | struct device; |
32 | struct device_driver; | |
33 | struct class; | |
34 | struct class_device; | |
1da177e4 LT |
35 | |
36 | struct bus_type { | |
8d790d74 | 37 | const char * name; |
1da177e4 LT |
38 | |
39 | struct subsystem subsys; | |
40 | struct kset drivers; | |
41 | struct kset devices; | |
465c7a3a | 42 | struct klist klist_devices; |
38fdac3c | 43 | struct klist klist_drivers; |
1da177e4 LT |
44 | |
45 | struct bus_attribute * bus_attrs; | |
46 | struct device_attribute * dev_attrs; | |
47 | struct driver_attribute * drv_attrs; | |
48 | ||
49 | int (*match)(struct device * dev, struct device_driver * drv); | |
312c004d KS |
50 | int (*uevent)(struct device *dev, char **envp, |
51 | int num_envp, char *buffer, int buffer_size); | |
1da177e4 LT |
52 | int (*suspend)(struct device * dev, pm_message_t state); |
53 | int (*resume)(struct device * dev); | |
54 | }; | |
55 | ||
56 | extern int bus_register(struct bus_type * bus); | |
57 | extern void bus_unregister(struct bus_type * bus); | |
58 | ||
23d3d602 | 59 | extern void bus_rescan_devices(struct bus_type * bus); |
1da177e4 LT |
60 | |
61 | extern struct bus_type * get_bus(struct bus_type * bus); | |
62 | extern void put_bus(struct bus_type * bus); | |
63 | ||
64 | extern struct bus_type * find_bus(char * name); | |
65 | ||
66 | /* iterator helpers for buses */ | |
67 | ||
68 | int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data, | |
69 | int (*fn)(struct device *, void *)); | |
0edb5860 CH |
70 | struct device * bus_find_device(struct bus_type *bus, struct device *start, |
71 | void *data, int (*match)(struct device *, void *)); | |
1da177e4 LT |
72 | |
73 | int bus_for_each_drv(struct bus_type * bus, struct device_driver * start, | |
74 | void * data, int (*fn)(struct device_driver *, void *)); | |
75 | ||
76 | ||
77 | /* driverfs interface for exporting bus attributes */ | |
78 | ||
79 | struct bus_attribute { | |
80 | struct attribute attr; | |
81 | ssize_t (*show)(struct bus_type *, char * buf); | |
82 | ssize_t (*store)(struct bus_type *, const char * buf, size_t count); | |
83 | }; | |
84 | ||
85 | #define BUS_ATTR(_name,_mode,_show,_store) \ | |
86 | struct bus_attribute bus_attr_##_name = __ATTR(_name,_mode,_show,_store) | |
87 | ||
88 | extern int bus_create_file(struct bus_type *, struct bus_attribute *); | |
89 | extern void bus_remove_file(struct bus_type *, struct bus_attribute *); | |
90 | ||
91 | struct device_driver { | |
8d790d74 | 92 | const char * name; |
1da177e4 LT |
93 | struct bus_type * bus; |
94 | ||
95 | struct completion unloaded; | |
96 | struct kobject kobj; | |
94e7b1c5 | 97 | struct klist klist_devices; |
38fdac3c | 98 | struct klist_node knode_bus; |
1da177e4 | 99 | |
8d790d74 | 100 | struct module * owner; |
1da177e4 LT |
101 | |
102 | int (*probe) (struct device * dev); | |
8d790d74 | 103 | int (*remove) (struct device * dev); |
1da177e4 | 104 | void (*shutdown) (struct device * dev); |
9480e307 RK |
105 | int (*suspend) (struct device * dev, pm_message_t state); |
106 | int (*resume) (struct device * dev); | |
1da177e4 LT |
107 | }; |
108 | ||
109 | ||
110 | extern int driver_register(struct device_driver * drv); | |
111 | extern void driver_unregister(struct device_driver * drv); | |
112 | ||
113 | extern struct device_driver * get_driver(struct device_driver * drv); | |
114 | extern void put_driver(struct device_driver * drv); | |
115 | extern struct device_driver *driver_find(const char *name, struct bus_type *bus); | |
116 | ||
117 | ||
118 | /* driverfs interface for exporting driver attributes */ | |
119 | ||
120 | struct driver_attribute { | |
121 | struct attribute attr; | |
122 | ssize_t (*show)(struct device_driver *, char * buf); | |
123 | ssize_t (*store)(struct device_driver *, const char * buf, size_t count); | |
124 | }; | |
125 | ||
126 | #define DRIVER_ATTR(_name,_mode,_show,_store) \ | |
127 | struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store) | |
128 | ||
129 | extern int driver_create_file(struct device_driver *, struct driver_attribute *); | |
130 | extern void driver_remove_file(struct device_driver *, struct driver_attribute *); | |
131 | ||
fae3cd00 PM |
132 | extern int driver_for_each_device(struct device_driver * drv, struct device * start, |
133 | void * data, int (*fn)(struct device *, void *)); | |
0edb5860 CH |
134 | struct device * driver_find_device(struct device_driver *drv, |
135 | struct device *start, void *data, | |
136 | int (*match)(struct device *, void *)); | |
fae3cd00 | 137 | |
1da177e4 LT |
138 | |
139 | /* | |
140 | * device classes | |
141 | */ | |
142 | struct class { | |
8d790d74 | 143 | const char * name; |
e9ba6365 | 144 | struct module * owner; |
1da177e4 LT |
145 | |
146 | struct subsystem subsys; | |
147 | struct list_head children; | |
148 | struct list_head interfaces; | |
149 | struct semaphore sem; /* locks both the children and interfaces lists */ | |
150 | ||
151 | struct class_attribute * class_attrs; | |
152 | struct class_device_attribute * class_dev_attrs; | |
153 | ||
312c004d | 154 | int (*uevent)(struct class_device *dev, char **envp, |
1da177e4 LT |
155 | int num_envp, char *buffer, int buffer_size); |
156 | ||
157 | void (*release)(struct class_device *dev); | |
158 | void (*class_release)(struct class *class); | |
159 | }; | |
160 | ||
161 | extern int class_register(struct class *); | |
162 | extern void class_unregister(struct class *); | |
163 | ||
164 | extern struct class * class_get(struct class *); | |
165 | extern void class_put(struct class *); | |
166 | ||
167 | ||
168 | struct class_attribute { | |
169 | struct attribute attr; | |
170 | ssize_t (*show)(struct class *, char * buf); | |
171 | ssize_t (*store)(struct class *, const char * buf, size_t count); | |
172 | }; | |
173 | ||
174 | #define CLASS_ATTR(_name,_mode,_show,_store) \ | |
175 | struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store) | |
176 | ||
177 | extern int class_create_file(struct class *, const struct class_attribute *); | |
178 | extern void class_remove_file(struct class *, const struct class_attribute *); | |
179 | ||
a7fd6706 KS |
180 | struct class_device_attribute { |
181 | struct attribute attr; | |
182 | ssize_t (*show)(struct class_device *, char * buf); | |
183 | ssize_t (*store)(struct class_device *, const char * buf, size_t count); | |
184 | }; | |
185 | ||
186 | #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store) \ | |
187 | struct class_device_attribute class_device_attr_##_name = \ | |
188 | __ATTR(_name,_mode,_show,_store) | |
189 | ||
190 | extern int class_device_create_file(struct class_device *, | |
191 | const struct class_device_attribute *); | |
1da177e4 | 192 | |
74be227f GKH |
193 | /** |
194 | * struct class_device - class devices | |
195 | * @class: pointer to the parent class for this class device. This is required. | |
196 | * @devt: for internal use by the driver core only. | |
197 | * @node: for internal use by the driver core only. | |
198 | * @kobj: for internal use by the driver core only. | |
199 | * @devt_attr: for internal use by the driver core only. | |
200 | * @dev: if set, a symlink to the struct device is created in the sysfs | |
201 | * directory for this struct class device. | |
202 | * @class_data: pointer to whatever you want to store here for this struct | |
203 | * class_device. Use class_get_devdata() and class_set_devdata() to get and | |
204 | * set this pointer. | |
205 | * @parent: pointer to a struct class_device that is the parent of this struct | |
206 | * class_device. If NULL, this class_device will show up at the root of the | |
207 | * struct class in sysfs (which is probably what you want to have happen.) | |
208 | * @release: pointer to a release function for this struct class_device. If | |
209 | * set, this will be called instead of the class specific release function. | |
210 | * Only use this if you want to override the default release function, like | |
211 | * when you are nesting class_device structures. | |
312c004d KS |
212 | * @uevent: pointer to a uevent function for this struct class_device. If |
213 | * set, this will be called instead of the class specific uevent function. | |
214 | * Only use this if you want to override the default uevent function, like | |
74be227f GKH |
215 | * when you are nesting class_device structures. |
216 | */ | |
1da177e4 LT |
217 | struct class_device { |
218 | struct list_head node; | |
219 | ||
220 | struct kobject kobj; | |
221 | struct class * class; /* required */ | |
222 | dev_t devt; /* dev_t, creates the sysfs "dev" */ | |
e9ba6365 | 223 | struct class_device_attribute *devt_attr; |
a7fd6706 | 224 | struct class_device_attribute uevent_attr; |
1da177e4 LT |
225 | struct device * dev; /* not necessary, but nice to have */ |
226 | void * class_data; /* class-specific data */ | |
51d172d5 | 227 | struct class_device *parent; /* parent of this child device, if there is one */ |
1da177e4 | 228 | |
51d172d5 | 229 | void (*release)(struct class_device *dev); |
312c004d | 230 | int (*uevent)(struct class_device *dev, char **envp, |
51d172d5 | 231 | int num_envp, char *buffer, int buffer_size); |
1da177e4 LT |
232 | char class_id[BUS_ID_SIZE]; /* unique to this class */ |
233 | }; | |
234 | ||
235 | static inline void * | |
236 | class_get_devdata (struct class_device *dev) | |
237 | { | |
238 | return dev->class_data; | |
239 | } | |
240 | ||
241 | static inline void | |
242 | class_set_devdata (struct class_device *dev, void *data) | |
243 | { | |
244 | dev->class_data = data; | |
245 | } | |
246 | ||
247 | ||
248 | extern int class_device_register(struct class_device *); | |
249 | extern void class_device_unregister(struct class_device *); | |
250 | extern void class_device_initialize(struct class_device *); | |
251 | extern int class_device_add(struct class_device *); | |
252 | extern void class_device_del(struct class_device *); | |
253 | ||
254 | extern int class_device_rename(struct class_device *, char *); | |
255 | ||
256 | extern struct class_device * class_device_get(struct class_device *); | |
257 | extern void class_device_put(struct class_device *); | |
258 | ||
1da177e4 LT |
259 | extern void class_device_remove_file(struct class_device *, |
260 | const struct class_device_attribute *); | |
261 | extern int class_device_create_bin_file(struct class_device *, | |
262 | struct bin_attribute *); | |
263 | extern void class_device_remove_bin_file(struct class_device *, | |
264 | struct bin_attribute *); | |
265 | ||
266 | struct class_interface { | |
267 | struct list_head node; | |
268 | struct class *class; | |
269 | ||
d8539d81 DT |
270 | int (*add) (struct class_device *, struct class_interface *); |
271 | void (*remove) (struct class_device *, struct class_interface *); | |
1da177e4 LT |
272 | }; |
273 | ||
274 | extern int class_interface_register(struct class_interface *); | |
275 | extern void class_interface_unregister(struct class_interface *); | |
276 | ||
e9ba6365 GKH |
277 | extern struct class *class_create(struct module *owner, char *name); |
278 | extern void class_destroy(struct class *cls); | |
51d172d5 GKH |
279 | extern struct class_device *class_device_create(struct class *cls, |
280 | struct class_device *parent, | |
281 | dev_t devt, | |
282 | struct device *device, | |
283 | char *fmt, ...) | |
284 | __attribute__((format(printf,5,6))); | |
e9ba6365 GKH |
285 | extern void class_device_destroy(struct class *cls, dev_t devt); |
286 | ||
1da177e4 | 287 | |
a7fd6706 KS |
288 | /* interface for exporting device attributes */ |
289 | struct device_attribute { | |
290 | struct attribute attr; | |
291 | ssize_t (*show)(struct device *dev, struct device_attribute *attr, | |
292 | char *buf); | |
293 | ssize_t (*store)(struct device *dev, struct device_attribute *attr, | |
294 | const char *buf, size_t count); | |
295 | }; | |
296 | ||
297 | #define DEVICE_ATTR(_name,_mode,_show,_store) \ | |
298 | struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store) | |
299 | ||
300 | extern int device_create_file(struct device *device, struct device_attribute * entry); | |
301 | extern void device_remove_file(struct device * dev, struct device_attribute * attr); | |
1da177e4 | 302 | struct device { |
36239577 PM |
303 | struct klist klist_children; |
304 | struct klist_node knode_parent; /* node in sibling list */ | |
94e7b1c5 | 305 | struct klist_node knode_driver; |
465c7a3a | 306 | struct klist_node knode_bus; |
1da177e4 LT |
307 | struct device * parent; |
308 | ||
309 | struct kobject kobj; | |
310 | char bus_id[BUS_ID_SIZE]; /* position on parent bus */ | |
a7fd6706 | 311 | struct device_attribute uevent_attr; |
1da177e4 | 312 | |
af70316a PM |
313 | struct semaphore sem; /* semaphore to synchronize calls to |
314 | * its driver. | |
315 | */ | |
316 | ||
1da177e4 LT |
317 | struct bus_type * bus; /* type of bus device is on */ |
318 | struct device_driver *driver; /* which driver has allocated this | |
319 | device */ | |
320 | void *driver_data; /* data private to the driver */ | |
4e10d12a DSL |
321 | void *platform_data; /* Platform specific data, device |
322 | core doesn't touch it */ | |
323 | void *firmware_data; /* Firmware specific data (e.g. ACPI, | |
324 | BIOS data),reserved for device core*/ | |
1da177e4 LT |
325 | struct dev_pm_info power; |
326 | ||
1da177e4 LT |
327 | u64 *dma_mask; /* dma mask (if dma'able device) */ |
328 | u64 coherent_dma_mask;/* Like dma_mask, but for | |
329 | alloc_coherent mappings as | |
330 | not all hardware supports | |
331 | 64 bit addresses for consistent | |
332 | allocations such descriptors. */ | |
333 | ||
334 | struct list_head dma_pools; /* dma pools (if dma'ble) */ | |
335 | ||
336 | struct dma_coherent_mem *dma_mem; /* internal for coherent mem | |
337 | override */ | |
338 | ||
339 | void (*release)(struct device * dev); | |
340 | }; | |
341 | ||
1da177e4 LT |
342 | static inline void * |
343 | dev_get_drvdata (struct device *dev) | |
344 | { | |
345 | return dev->driver_data; | |
346 | } | |
347 | ||
348 | static inline void | |
349 | dev_set_drvdata (struct device *dev, void *data) | |
350 | { | |
351 | dev->driver_data = data; | |
352 | } | |
353 | ||
d305ef5d DR |
354 | static inline int device_is_registered(struct device *dev) |
355 | { | |
356 | return klist_node_attached(&dev->knode_bus); | |
357 | } | |
358 | ||
1da177e4 LT |
359 | /* |
360 | * High level routines for use by the bus drivers | |
361 | */ | |
362 | extern int device_register(struct device * dev); | |
363 | extern void device_unregister(struct device * dev); | |
364 | extern void device_initialize(struct device * dev); | |
365 | extern int device_add(struct device * dev); | |
366 | extern void device_del(struct device * dev); | |
367 | extern int device_for_each_child(struct device *, void *, | |
368 | int (*fn)(struct device *, void *)); | |
369 | ||
370 | /* | |
371 | * Manual binding of a device to driver. See drivers/base/bus.c | |
372 | * for information on use. | |
373 | */ | |
1da177e4 LT |
374 | extern void device_bind_driver(struct device * dev); |
375 | extern void device_release_driver(struct device * dev); | |
376 | extern int device_attach(struct device * dev); | |
377 | extern void driver_attach(struct device_driver * drv); | |
378 | ||
379 | ||
1da177e4 LT |
380 | /* |
381 | * Platform "fixup" functions - allow the platform to have their say | |
382 | * about devices and actions that the general device layer doesn't | |
383 | * know about. | |
384 | */ | |
385 | /* Notify platform of device discovery */ | |
386 | extern int (*platform_notify)(struct device * dev); | |
387 | ||
388 | extern int (*platform_notify_remove)(struct device * dev); | |
389 | ||
390 | ||
391 | /** | |
392 | * get_device - atomically increment the reference count for the device. | |
393 | * | |
394 | */ | |
395 | extern struct device * get_device(struct device * dev); | |
396 | extern void put_device(struct device * dev); | |
1da177e4 LT |
397 | |
398 | ||
1da177e4 LT |
399 | /* drivers/base/power.c */ |
400 | extern void device_shutdown(void); | |
401 | ||
402 | ||
403 | /* drivers/base/firmware.c */ | |
404 | extern int firmware_register(struct subsystem *); | |
405 | extern void firmware_unregister(struct subsystem *); | |
406 | ||
407 | /* debugging and troubleshooting/diagnostic helpers. */ | |
408 | #define dev_printk(level, dev, format, arg...) \ | |
409 | printk(level "%s %s: " format , (dev)->driver ? (dev)->driver->name : "" , (dev)->bus_id , ## arg) | |
410 | ||
411 | #ifdef DEBUG | |
412 | #define dev_dbg(dev, format, arg...) \ | |
413 | dev_printk(KERN_DEBUG , dev , format , ## arg) | |
414 | #else | |
415 | #define dev_dbg(dev, format, arg...) do { (void)(dev); } while (0) | |
416 | #endif | |
417 | ||
418 | #define dev_err(dev, format, arg...) \ | |
419 | dev_printk(KERN_ERR , dev , format , ## arg) | |
420 | #define dev_info(dev, format, arg...) \ | |
421 | dev_printk(KERN_INFO , dev , format , ## arg) | |
422 | #define dev_warn(dev, format, arg...) \ | |
423 | dev_printk(KERN_WARNING , dev , format , ## arg) | |
424 | ||
425 | /* Create alias, so I can be autoloaded. */ | |
426 | #define MODULE_ALIAS_CHARDEV(major,minor) \ | |
427 | MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor)) | |
428 | #define MODULE_ALIAS_CHARDEV_MAJOR(major) \ | |
429 | MODULE_ALIAS("char-major-" __stringify(major) "-*") | |
430 | #endif /* _DEVICE_H_ */ |