diff options
Diffstat (limited to 'drivers/base/bus.c')
-rw-r--r-- | drivers/base/bus.c | 182 |
1 files changed, 0 insertions, 182 deletions
diff --git a/drivers/base/bus.c b/drivers/base/bus.c index aa27f76d28cd..1b05c1399e37 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c | |||
@@ -18,7 +18,6 @@ | |||
18 | #include "power/power.h" | 18 | #include "power/power.h" |
19 | 19 | ||
20 | #define to_dev(node) container_of(node, struct device, bus_list) | 20 | #define to_dev(node) container_of(node, struct device, bus_list) |
21 | #define to_drv(node) container_of(node, struct device_driver, kobj.entry) | ||
22 | 21 | ||
23 | #define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr) | 22 | #define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr) |
24 | #define to_bus(obj) container_of(obj, struct bus_type, subsys.kset.kobj) | 23 | #define to_bus(obj) container_of(obj, struct bus_type, subsys.kset.kobj) |
@@ -243,181 +242,6 @@ int bus_for_each_drv(struct bus_type * bus, struct device_driver * start, | |||
243 | return ret; | 242 | return ret; |
244 | } | 243 | } |
245 | 244 | ||
246 | /** | ||
247 | * device_bind_driver - bind a driver to one device. | ||
248 | * @dev: device. | ||
249 | * | ||
250 | * Allow manual attachment of a driver to a device. | ||
251 | * Caller must have already set @dev->driver. | ||
252 | * | ||
253 | * Note that this does not modify the bus reference count | ||
254 | * nor take the bus's rwsem. Please verify those are accounted | ||
255 | * for before calling this. (It is ok to call with no other effort | ||
256 | * from a driver's probe() method.) | ||
257 | */ | ||
258 | |||
259 | void device_bind_driver(struct device * dev) | ||
260 | { | ||
261 | pr_debug("bound device '%s' to driver '%s'\n", | ||
262 | dev->bus_id, dev->driver->name); | ||
263 | list_add_tail(&dev->driver_list, &dev->driver->devices); | ||
264 | sysfs_create_link(&dev->driver->kobj, &dev->kobj, | ||
265 | kobject_name(&dev->kobj)); | ||
266 | sysfs_create_link(&dev->kobj, &dev->driver->kobj, "driver"); | ||
267 | } | ||
268 | |||
269 | |||
270 | /** | ||
271 | * driver_probe_device - attempt to bind device & driver. | ||
272 | * @drv: driver. | ||
273 | * @dev: device. | ||
274 | * | ||
275 | * First, we call the bus's match function, if one present, which | ||
276 | * should compare the device IDs the driver supports with the | ||
277 | * device IDs of the device. Note we don't do this ourselves | ||
278 | * because we don't know the format of the ID structures, nor what | ||
279 | * is to be considered a match and what is not. | ||
280 | * | ||
281 | * If we find a match, we call @drv->probe(@dev) if it exists, and | ||
282 | * call device_bind_driver() above. | ||
283 | */ | ||
284 | int driver_probe_device(struct device_driver * drv, struct device * dev) | ||
285 | { | ||
286 | int error = 0; | ||
287 | |||
288 | if (drv->bus->match && !drv->bus->match(dev, drv)) | ||
289 | return -ENODEV; | ||
290 | |||
291 | down(&dev->sem); | ||
292 | dev->driver = drv; | ||
293 | if (drv->probe) { | ||
294 | error = drv->probe(dev); | ||
295 | if (error) { | ||
296 | dev->driver = NULL; | ||
297 | up(&dev->sem); | ||
298 | return error; | ||
299 | } | ||
300 | } | ||
301 | up(&dev->sem); | ||
302 | device_bind_driver(dev); | ||
303 | return 0; | ||
304 | } | ||
305 | |||
306 | |||
307 | /** | ||
308 | * device_attach - try to attach device to a driver. | ||
309 | * @dev: device. | ||
310 | * | ||
311 | * Walk the list of drivers that the bus has and call | ||
312 | * driver_probe_device() for each pair. If a compatible | ||
313 | * pair is found, break out and return. | ||
314 | */ | ||
315 | int device_attach(struct device * dev) | ||
316 | { | ||
317 | struct bus_type * bus = dev->bus; | ||
318 | struct list_head * entry; | ||
319 | int error; | ||
320 | |||
321 | if (dev->driver) { | ||
322 | device_bind_driver(dev); | ||
323 | return 1; | ||
324 | } | ||
325 | |||
326 | if (bus->match) { | ||
327 | list_for_each(entry, &bus->drivers.list) { | ||
328 | struct device_driver * drv = to_drv(entry); | ||
329 | error = driver_probe_device(drv, dev); | ||
330 | if (!error) | ||
331 | /* success, driver matched */ | ||
332 | return 1; | ||
333 | if (error != -ENODEV && error != -ENXIO) | ||
334 | /* driver matched but the probe failed */ | ||
335 | printk(KERN_WARNING | ||
336 | "%s: probe of %s failed with error %d\n", | ||
337 | drv->name, dev->bus_id, error); | ||
338 | } | ||
339 | } | ||
340 | |||
341 | return 0; | ||
342 | } | ||
343 | |||
344 | |||
345 | /** | ||
346 | * driver_attach - try to bind driver to devices. | ||
347 | * @drv: driver. | ||
348 | * | ||
349 | * Walk the list of devices that the bus has on it and try to | ||
350 | * match the driver with each one. If driver_probe_device() | ||
351 | * returns 0 and the @dev->driver is set, we've found a | ||
352 | * compatible pair. | ||
353 | * | ||
354 | * Note that we ignore the -ENODEV error from driver_probe_device(), | ||
355 | * since it's perfectly valid for a driver not to bind to any devices. | ||
356 | */ | ||
357 | void driver_attach(struct device_driver * drv) | ||
358 | { | ||
359 | struct bus_type * bus = drv->bus; | ||
360 | struct list_head * entry; | ||
361 | int error; | ||
362 | |||
363 | if (!bus->match) | ||
364 | return; | ||
365 | |||
366 | list_for_each(entry, &bus->devices.list) { | ||
367 | struct device * dev = container_of(entry, struct device, bus_list); | ||
368 | if (!dev->driver) { | ||
369 | error = driver_probe_device(drv, dev); | ||
370 | if (error && (error != -ENODEV)) | ||
371 | /* driver matched but the probe failed */ | ||
372 | printk(KERN_WARNING | ||
373 | "%s: probe of %s failed with error %d\n", | ||
374 | drv->name, dev->bus_id, error); | ||
375 | } | ||
376 | } | ||
377 | } | ||
378 | |||
379 | |||
380 | /** | ||
381 | * device_release_driver - manually detach device from driver. | ||
382 | * @dev: device. | ||
383 | * | ||
384 | * Manually detach device from driver. | ||
385 | * Note that this is called without incrementing the bus | ||
386 | * reference count nor taking the bus's rwsem. Be sure that | ||
387 | * those are accounted for before calling this function. | ||
388 | */ | ||
389 | |||
390 | void device_release_driver(struct device * dev) | ||
391 | { | ||
392 | struct device_driver * drv; | ||
393 | |||
394 | down(&dev->sem); | ||
395 | drv = dev->driver; | ||
396 | if (drv) { | ||
397 | sysfs_remove_link(&drv->kobj, kobject_name(&dev->kobj)); | ||
398 | sysfs_remove_link(&dev->kobj, "driver"); | ||
399 | list_del_init(&dev->driver_list); | ||
400 | if (drv->remove) | ||
401 | drv->remove(dev); | ||
402 | dev->driver = NULL; | ||
403 | } | ||
404 | up(&dev->sem); | ||
405 | } | ||
406 | |||
407 | |||
408 | /** | ||
409 | * driver_detach - detach driver from all devices it controls. | ||
410 | * @drv: driver. | ||
411 | */ | ||
412 | |||
413 | static void driver_detach(struct device_driver * drv) | ||
414 | { | ||
415 | while (!list_empty(&drv->devices)) { | ||
416 | struct device * dev = container_of(drv->devices.next, struct device, driver_list); | ||
417 | device_release_driver(dev); | ||
418 | } | ||
419 | } | ||
420 | |||
421 | static int device_add_attrs(struct bus_type * bus, struct device * dev) | 245 | static int device_add_attrs(struct bus_type * bus, struct device * dev) |
422 | { | 246 | { |
423 | int error = 0; | 247 | int error = 0; |
@@ -757,12 +581,6 @@ int __init buses_init(void) | |||
757 | EXPORT_SYMBOL_GPL(bus_for_each_dev); | 581 | EXPORT_SYMBOL_GPL(bus_for_each_dev); |
758 | EXPORT_SYMBOL_GPL(bus_for_each_drv); | 582 | EXPORT_SYMBOL_GPL(bus_for_each_drv); |
759 | 583 | ||
760 | EXPORT_SYMBOL_GPL(driver_probe_device); | ||
761 | EXPORT_SYMBOL_GPL(device_bind_driver); | ||
762 | EXPORT_SYMBOL_GPL(device_release_driver); | ||
763 | EXPORT_SYMBOL_GPL(device_attach); | ||
764 | EXPORT_SYMBOL_GPL(driver_attach); | ||
765 | |||
766 | EXPORT_SYMBOL_GPL(bus_add_device); | 584 | EXPORT_SYMBOL_GPL(bus_add_device); |
767 | EXPORT_SYMBOL_GPL(bus_remove_device); | 585 | EXPORT_SYMBOL_GPL(bus_remove_device); |
768 | EXPORT_SYMBOL_GPL(bus_register); | 586 | EXPORT_SYMBOL_GPL(bus_register); |