Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * platform.c - platform 'pseudo' bus for legacy devices | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * Please see Documentation/driver-model/platform.txt for more | |
10 | * information. | |
11 | */ | |
12 | ||
d052d1be | 13 | #include <linux/platform_device.h> |
1da177e4 LT |
14 | #include <linux/module.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/dma-mapping.h> | |
17 | #include <linux/bootmem.h> | |
18 | #include <linux/err.h> | |
4e57b681 | 19 | #include <linux/slab.h> |
1da177e4 | 20 | |
a1bdc7aa BD |
21 | #include "base.h" |
22 | ||
4a3ad20c GKH |
23 | #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \ |
24 | driver)) | |
00d3dcdd | 25 | |
1da177e4 | 26 | struct device platform_bus = { |
1e0b2cf9 | 27 | .init_name = "platform", |
1da177e4 | 28 | }; |
a96b2042 | 29 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 LT |
30 | |
31 | /** | |
4a3ad20c GKH |
32 | * platform_get_resource - get a resource for a device |
33 | * @dev: platform device | |
34 | * @type: resource type | |
35 | * @num: resource index | |
1da177e4 | 36 | */ |
4a3ad20c GKH |
37 | struct resource *platform_get_resource(struct platform_device *dev, |
38 | unsigned int type, unsigned int num) | |
1da177e4 LT |
39 | { |
40 | int i; | |
41 | ||
42 | for (i = 0; i < dev->num_resources; i++) { | |
43 | struct resource *r = &dev->resource[i]; | |
44 | ||
c9f66169 MD |
45 | if (type == resource_type(r) && num-- == 0) |
46 | return r; | |
1da177e4 LT |
47 | } |
48 | return NULL; | |
49 | } | |
a96b2042 | 50 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
51 | |
52 | /** | |
4a3ad20c GKH |
53 | * platform_get_irq - get an IRQ for a device |
54 | * @dev: platform device | |
55 | * @num: IRQ number index | |
1da177e4 LT |
56 | */ |
57 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
58 | { | |
59 | struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
60 | ||
305b3228 | 61 | return r ? r->start : -ENXIO; |
1da177e4 | 62 | } |
a96b2042 | 63 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
64 | |
65 | /** | |
4a3ad20c GKH |
66 | * platform_get_resource_byname - get a resource for a device by name |
67 | * @dev: platform device | |
68 | * @type: resource type | |
69 | * @name: resource name | |
1da177e4 | 70 | */ |
4a3ad20c GKH |
71 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
72 | unsigned int type, char *name) | |
1da177e4 LT |
73 | { |
74 | int i; | |
75 | ||
76 | for (i = 0; i < dev->num_resources; i++) { | |
77 | struct resource *r = &dev->resource[i]; | |
78 | ||
c9f66169 MD |
79 | if (type == resource_type(r) && !strcmp(r->name, name)) |
80 | return r; | |
1da177e4 LT |
81 | } |
82 | return NULL; | |
83 | } | |
a96b2042 | 84 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
85 | |
86 | /** | |
4a3ad20c GKH |
87 | * platform_get_irq - get an IRQ for a device |
88 | * @dev: platform device | |
89 | * @name: IRQ name | |
1da177e4 LT |
90 | */ |
91 | int platform_get_irq_byname(struct platform_device *dev, char *name) | |
92 | { | |
4a3ad20c GKH |
93 | struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, |
94 | name); | |
1da177e4 | 95 | |
305b3228 | 96 | return r ? r->start : -ENXIO; |
1da177e4 | 97 | } |
a96b2042 | 98 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
99 | |
100 | /** | |
4a3ad20c GKH |
101 | * platform_add_devices - add a numbers of platform devices |
102 | * @devs: array of platform devices to add | |
103 | * @num: number of platform devices in array | |
1da177e4 LT |
104 | */ |
105 | int platform_add_devices(struct platform_device **devs, int num) | |
106 | { | |
107 | int i, ret = 0; | |
108 | ||
109 | for (i = 0; i < num; i++) { | |
110 | ret = platform_device_register(devs[i]); | |
111 | if (ret) { | |
112 | while (--i >= 0) | |
113 | platform_device_unregister(devs[i]); | |
114 | break; | |
115 | } | |
116 | } | |
117 | ||
118 | return ret; | |
119 | } | |
a96b2042 | 120 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 121 | |
37c12e74 RK |
122 | struct platform_object { |
123 | struct platform_device pdev; | |
124 | char name[1]; | |
125 | }; | |
126 | ||
1da177e4 | 127 | /** |
4a3ad20c GKH |
128 | * platform_device_put |
129 | * @pdev: platform device to free | |
37c12e74 | 130 | * |
4a3ad20c GKH |
131 | * Free all memory associated with a platform device. This function must |
132 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
133 | */ |
134 | void platform_device_put(struct platform_device *pdev) | |
135 | { | |
136 | if (pdev) | |
137 | put_device(&pdev->dev); | |
138 | } | |
139 | EXPORT_SYMBOL_GPL(platform_device_put); | |
140 | ||
141 | static void platform_device_release(struct device *dev) | |
142 | { | |
4a3ad20c GKH |
143 | struct platform_object *pa = container_of(dev, struct platform_object, |
144 | pdev.dev); | |
37c12e74 RK |
145 | |
146 | kfree(pa->pdev.dev.platform_data); | |
147 | kfree(pa->pdev.resource); | |
148 | kfree(pa); | |
149 | } | |
150 | ||
151 | /** | |
4a3ad20c GKH |
152 | * platform_device_alloc |
153 | * @name: base name of the device we're adding | |
154 | * @id: instance id | |
37c12e74 | 155 | * |
4a3ad20c GKH |
156 | * Create a platform device object which can have other objects attached |
157 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 158 | */ |
1359555e | 159 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
160 | { |
161 | struct platform_object *pa; | |
162 | ||
163 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); | |
164 | if (pa) { | |
165 | strcpy(pa->name, name); | |
166 | pa->pdev.name = pa->name; | |
167 | pa->pdev.id = id; | |
168 | device_initialize(&pa->pdev.dev); | |
169 | pa->pdev.dev.release = platform_device_release; | |
170 | } | |
171 | ||
93ce3061 | 172 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
173 | } |
174 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
175 | ||
176 | /** | |
4a3ad20c GKH |
177 | * platform_device_add_resources |
178 | * @pdev: platform device allocated by platform_device_alloc to add resources to | |
179 | * @res: set of resources that needs to be allocated for the device | |
180 | * @num: number of resources | |
37c12e74 | 181 | * |
4a3ad20c GKH |
182 | * Add a copy of the resources to the platform device. The memory |
183 | * associated with the resources will be freed when the platform device is | |
184 | * released. | |
37c12e74 | 185 | */ |
4a3ad20c GKH |
186 | int platform_device_add_resources(struct platform_device *pdev, |
187 | struct resource *res, unsigned int num) | |
37c12e74 RK |
188 | { |
189 | struct resource *r; | |
190 | ||
191 | r = kmalloc(sizeof(struct resource) * num, GFP_KERNEL); | |
192 | if (r) { | |
193 | memcpy(r, res, sizeof(struct resource) * num); | |
194 | pdev->resource = r; | |
195 | pdev->num_resources = num; | |
196 | } | |
197 | return r ? 0 : -ENOMEM; | |
198 | } | |
199 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
200 | ||
201 | /** | |
4a3ad20c GKH |
202 | * platform_device_add_data |
203 | * @pdev: platform device allocated by platform_device_alloc to add resources to | |
204 | * @data: platform specific data for this platform device | |
205 | * @size: size of platform specific data | |
37c12e74 | 206 | * |
4a3ad20c GKH |
207 | * Add a copy of platform specific data to the platform device's |
208 | * platform_data pointer. The memory associated with the platform data | |
209 | * will be freed when the platform device is released. | |
37c12e74 | 210 | */ |
4a3ad20c GKH |
211 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
212 | size_t size) | |
37c12e74 RK |
213 | { |
214 | void *d; | |
215 | ||
216 | d = kmalloc(size, GFP_KERNEL); | |
217 | if (d) { | |
218 | memcpy(d, data, size); | |
219 | pdev->dev.platform_data = d; | |
220 | } | |
221 | return d ? 0 : -ENOMEM; | |
222 | } | |
223 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
224 | ||
225 | /** | |
4a3ad20c GKH |
226 | * platform_device_add - add a platform device to device hierarchy |
227 | * @pdev: platform device we're adding | |
1da177e4 | 228 | * |
4a3ad20c GKH |
229 | * This is part 2 of platform_device_register(), though may be called |
230 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 231 | */ |
37c12e74 | 232 | int platform_device_add(struct platform_device *pdev) |
1da177e4 LT |
233 | { |
234 | int i, ret = 0; | |
235 | ||
236 | if (!pdev) | |
237 | return -EINVAL; | |
238 | ||
239 | if (!pdev->dev.parent) | |
240 | pdev->dev.parent = &platform_bus; | |
241 | ||
242 | pdev->dev.bus = &platform_bus_type; | |
243 | ||
244 | if (pdev->id != -1) | |
1e0b2cf9 | 245 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
1da177e4 | 246 | else |
1e0b2cf9 | 247 | dev_set_name(&pdev->dev, pdev->name); |
1da177e4 LT |
248 | |
249 | for (i = 0; i < pdev->num_resources; i++) { | |
250 | struct resource *p, *r = &pdev->resource[i]; | |
251 | ||
252 | if (r->name == NULL) | |
1e0b2cf9 | 253 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
254 | |
255 | p = r->parent; | |
256 | if (!p) { | |
c9f66169 | 257 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 258 | p = &iomem_resource; |
c9f66169 | 259 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
260 | p = &ioport_resource; |
261 | } | |
262 | ||
d960bb4d | 263 | if (p && insert_resource(p, r)) { |
1da177e4 LT |
264 | printk(KERN_ERR |
265 | "%s: failed to claim resource %d\n", | |
1e0b2cf9 | 266 | dev_name(&pdev->dev), i); |
1da177e4 LT |
267 | ret = -EBUSY; |
268 | goto failed; | |
269 | } | |
270 | } | |
271 | ||
272 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 273 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 274 | |
e3915532 | 275 | ret = device_add(&pdev->dev); |
1da177e4 LT |
276 | if (ret == 0) |
277 | return ret; | |
278 | ||
279 | failed: | |
c9f66169 MD |
280 | while (--i >= 0) { |
281 | struct resource *r = &pdev->resource[i]; | |
282 | unsigned long type = resource_type(r); | |
283 | ||
284 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
285 | release_resource(r); | |
286 | } | |
287 | ||
1da177e4 LT |
288 | return ret; |
289 | } | |
37c12e74 RK |
290 | EXPORT_SYMBOL_GPL(platform_device_add); |
291 | ||
292 | /** | |
4a3ad20c GKH |
293 | * platform_device_del - remove a platform-level device |
294 | * @pdev: platform device we're removing | |
1da177e4 | 295 | * |
4a3ad20c GKH |
296 | * Note that this function will also release all memory- and port-based |
297 | * resources owned by the device (@dev->resource). This function must | |
298 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 299 | */ |
93ce3061 | 300 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
301 | { |
302 | int i; | |
303 | ||
304 | if (pdev) { | |
dc4c15d4 JD |
305 | device_del(&pdev->dev); |
306 | ||
1da177e4 LT |
307 | for (i = 0; i < pdev->num_resources; i++) { |
308 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
309 | unsigned long type = resource_type(r); |
310 | ||
311 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
312 | release_resource(r); |
313 | } | |
1da177e4 LT |
314 | } |
315 | } | |
93ce3061 DT |
316 | EXPORT_SYMBOL_GPL(platform_device_del); |
317 | ||
318 | /** | |
4a3ad20c GKH |
319 | * platform_device_register - add a platform-level device |
320 | * @pdev: platform device we're adding | |
93ce3061 | 321 | */ |
4a3ad20c | 322 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
323 | { |
324 | device_initialize(&pdev->dev); | |
325 | return platform_device_add(pdev); | |
326 | } | |
a96b2042 | 327 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
328 | |
329 | /** | |
4a3ad20c GKH |
330 | * platform_device_unregister - unregister a platform-level device |
331 | * @pdev: platform device we're unregistering | |
93ce3061 | 332 | * |
4a3ad20c GKH |
333 | * Unregistration is done in 2 steps. First we release all resources |
334 | * and remove it from the subsystem, then we drop reference count by | |
335 | * calling platform_device_put(). | |
93ce3061 | 336 | */ |
4a3ad20c | 337 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
338 | { |
339 | platform_device_del(pdev); | |
340 | platform_device_put(pdev); | |
341 | } | |
a96b2042 | 342 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 343 | |
1da177e4 | 344 | /** |
4a3ad20c GKH |
345 | * platform_device_register_simple |
346 | * @name: base name of the device we're adding | |
347 | * @id: instance id | |
348 | * @res: set of resources that needs to be allocated for the device | |
349 | * @num: number of resources | |
1da177e4 | 350 | * |
4a3ad20c GKH |
351 | * This function creates a simple platform device that requires minimal |
352 | * resource and memory management. Canned release function freeing memory | |
353 | * allocated for the device allows drivers using such devices to be | |
354 | * unloaded without waiting for the last reference to the device to be | |
355 | * dropped. | |
49a4ec18 | 356 | * |
4a3ad20c GKH |
357 | * This interface is primarily intended for use with legacy drivers which |
358 | * probe hardware directly. Because such drivers create sysfs device nodes | |
359 | * themselves, rather than letting system infrastructure handle such device | |
360 | * enumeration tasks, they don't fully conform to the Linux driver model. | |
361 | * In particular, when such drivers are built as modules, they can't be | |
362 | * "hotplugged". | |
1da177e4 | 363 | */ |
4a3ad20c GKH |
364 | struct platform_device *platform_device_register_simple(const char *name, |
365 | int id, | |
366 | struct resource *res, | |
367 | unsigned int num) | |
1da177e4 | 368 | { |
37c12e74 | 369 | struct platform_device *pdev; |
1da177e4 LT |
370 | int retval; |
371 | ||
37c12e74 RK |
372 | pdev = platform_device_alloc(name, id); |
373 | if (!pdev) { | |
1da177e4 LT |
374 | retval = -ENOMEM; |
375 | goto error; | |
376 | } | |
377 | ||
1da177e4 | 378 | if (num) { |
37c12e74 RK |
379 | retval = platform_device_add_resources(pdev, res, num); |
380 | if (retval) | |
381 | goto error; | |
1da177e4 LT |
382 | } |
383 | ||
37c12e74 | 384 | retval = platform_device_add(pdev); |
1da177e4 LT |
385 | if (retval) |
386 | goto error; | |
387 | ||
37c12e74 | 388 | return pdev; |
1da177e4 LT |
389 | |
390 | error: | |
37c12e74 | 391 | platform_device_put(pdev); |
1da177e4 LT |
392 | return ERR_PTR(retval); |
393 | } | |
a96b2042 | 394 | EXPORT_SYMBOL_GPL(platform_device_register_simple); |
1da177e4 | 395 | |
d8bf2540 DB |
396 | /** |
397 | * platform_device_register_data | |
398 | * @parent: parent device for the device we're adding | |
399 | * @name: base name of the device we're adding | |
400 | * @id: instance id | |
401 | * @data: platform specific data for this platform device | |
402 | * @size: size of platform specific data | |
403 | * | |
404 | * This function creates a simple platform device that requires minimal | |
405 | * resource and memory management. Canned release function freeing memory | |
406 | * allocated for the device allows drivers using such devices to be | |
407 | * unloaded without waiting for the last reference to the device to be | |
408 | * dropped. | |
409 | */ | |
410 | struct platform_device *platform_device_register_data( | |
411 | struct device *parent, | |
412 | const char *name, int id, | |
413 | const void *data, size_t size) | |
414 | { | |
415 | struct platform_device *pdev; | |
416 | int retval; | |
417 | ||
418 | pdev = platform_device_alloc(name, id); | |
419 | if (!pdev) { | |
420 | retval = -ENOMEM; | |
421 | goto error; | |
422 | } | |
423 | ||
424 | pdev->dev.parent = parent; | |
425 | ||
426 | if (size) { | |
427 | retval = platform_device_add_data(pdev, data, size); | |
428 | if (retval) | |
429 | goto error; | |
430 | } | |
431 | ||
432 | retval = platform_device_add(pdev); | |
433 | if (retval) | |
434 | goto error; | |
435 | ||
436 | return pdev; | |
437 | ||
438 | error: | |
439 | platform_device_put(pdev); | |
440 | return ERR_PTR(retval); | |
441 | } | |
442 | ||
00d3dcdd RK |
443 | static int platform_drv_probe(struct device *_dev) |
444 | { | |
445 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
446 | struct platform_device *dev = to_platform_device(_dev); | |
447 | ||
448 | return drv->probe(dev); | |
449 | } | |
450 | ||
c67334fb DB |
451 | static int platform_drv_probe_fail(struct device *_dev) |
452 | { | |
453 | return -ENXIO; | |
454 | } | |
455 | ||
00d3dcdd RK |
456 | static int platform_drv_remove(struct device *_dev) |
457 | { | |
458 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
459 | struct platform_device *dev = to_platform_device(_dev); | |
460 | ||
461 | return drv->remove(dev); | |
462 | } | |
463 | ||
464 | static void platform_drv_shutdown(struct device *_dev) | |
465 | { | |
466 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
467 | struct platform_device *dev = to_platform_device(_dev); | |
468 | ||
469 | drv->shutdown(dev); | |
470 | } | |
471 | ||
472 | static int platform_drv_suspend(struct device *_dev, pm_message_t state) | |
473 | { | |
474 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
475 | struct platform_device *dev = to_platform_device(_dev); | |
476 | ||
477 | return drv->suspend(dev, state); | |
478 | } | |
479 | ||
480 | static int platform_drv_resume(struct device *_dev) | |
481 | { | |
482 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
483 | struct platform_device *dev = to_platform_device(_dev); | |
484 | ||
485 | return drv->resume(dev); | |
486 | } | |
487 | ||
488 | /** | |
4a3ad20c GKH |
489 | * platform_driver_register |
490 | * @drv: platform driver structure | |
00d3dcdd RK |
491 | */ |
492 | int platform_driver_register(struct platform_driver *drv) | |
493 | { | |
494 | drv->driver.bus = &platform_bus_type; | |
495 | if (drv->probe) | |
496 | drv->driver.probe = platform_drv_probe; | |
497 | if (drv->remove) | |
498 | drv->driver.remove = platform_drv_remove; | |
499 | if (drv->shutdown) | |
500 | drv->driver.shutdown = platform_drv_shutdown; | |
501 | if (drv->suspend) | |
502 | drv->driver.suspend = platform_drv_suspend; | |
503 | if (drv->resume) | |
504 | drv->driver.resume = platform_drv_resume; | |
505 | return driver_register(&drv->driver); | |
506 | } | |
507 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
508 | ||
509 | /** | |
4a3ad20c GKH |
510 | * platform_driver_unregister |
511 | * @drv: platform driver structure | |
00d3dcdd RK |
512 | */ |
513 | void platform_driver_unregister(struct platform_driver *drv) | |
514 | { | |
515 | driver_unregister(&drv->driver); | |
516 | } | |
517 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
518 | ||
c67334fb DB |
519 | /** |
520 | * platform_driver_probe - register driver for non-hotpluggable device | |
521 | * @drv: platform driver structure | |
522 | * @probe: the driver probe routine, probably from an __init section | |
523 | * | |
524 | * Use this instead of platform_driver_register() when you know the device | |
525 | * is not hotpluggable and has already been registered, and you want to | |
526 | * remove its run-once probe() infrastructure from memory after the driver | |
527 | * has bound to the device. | |
528 | * | |
529 | * One typical use for this would be with drivers for controllers integrated | |
530 | * into system-on-chip processors, where the controller devices have been | |
531 | * configured as part of board setup. | |
532 | * | |
533 | * Returns zero if the driver registered and bound to a device, else returns | |
534 | * a negative error code and with the driver not registered. | |
535 | */ | |
c63e0783 | 536 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
537 | int (*probe)(struct platform_device *)) |
538 | { | |
539 | int retval, code; | |
540 | ||
541 | /* temporary section violation during probe() */ | |
542 | drv->probe = probe; | |
543 | retval = code = platform_driver_register(drv); | |
544 | ||
545 | /* Fixup that section violation, being paranoid about code scanning | |
546 | * the list of drivers in order to probe new devices. Check to see | |
547 | * if the probe was successful, and make sure any forced probes of | |
548 | * new devices fail. | |
549 | */ | |
c6f7e72a | 550 | spin_lock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb | 551 | drv->probe = NULL; |
e5dd1278 | 552 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
553 | retval = -ENODEV; |
554 | drv->driver.probe = platform_drv_probe_fail; | |
c6f7e72a | 555 | spin_unlock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb DB |
556 | |
557 | if (code != retval) | |
558 | platform_driver_unregister(drv); | |
559 | return retval; | |
560 | } | |
561 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 562 | |
a0245f7a DB |
563 | /* modalias support enables more hands-off userspace setup: |
564 | * (a) environment variable lets new-style hotplug events work once system is | |
565 | * fully running: "modprobe $MODALIAS" | |
566 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
567 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
568 | */ | |
4a3ad20c GKH |
569 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
570 | char *buf) | |
a0245f7a DB |
571 | { |
572 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 573 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
574 | |
575 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
576 | } | |
577 | ||
578 | static struct device_attribute platform_dev_attrs[] = { | |
579 | __ATTR_RO(modalias), | |
580 | __ATTR_NULL, | |
581 | }; | |
582 | ||
7eff2e7a | 583 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
584 | { |
585 | struct platform_device *pdev = to_platform_device(dev); | |
586 | ||
57fee4a5 EM |
587 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
588 | (pdev->id_entry) ? pdev->id_entry->name : pdev->name); | |
a0245f7a DB |
589 | return 0; |
590 | } | |
591 | ||
57fee4a5 EM |
592 | static const struct platform_device_id *platform_match_id( |
593 | struct platform_device_id *id, | |
594 | struct platform_device *pdev) | |
595 | { | |
596 | while (id->name[0]) { | |
597 | if (strcmp(pdev->name, id->name) == 0) { | |
598 | pdev->id_entry = id; | |
599 | return id; | |
600 | } | |
601 | id++; | |
602 | } | |
603 | return NULL; | |
604 | } | |
605 | ||
1da177e4 | 606 | /** |
4a3ad20c GKH |
607 | * platform_match - bind platform device to platform driver. |
608 | * @dev: device. | |
609 | * @drv: driver. | |
1da177e4 | 610 | * |
4a3ad20c GKH |
611 | * Platform device IDs are assumed to be encoded like this: |
612 | * "<name><instance>", where <name> is a short description of the type of | |
613 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
614 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
615 | * "<name>". So, extract the <name> from the platform_device structure, | |
616 | * and compare it against the name of the driver. Return whether they match | |
617 | * or not. | |
1da177e4 | 618 | */ |
4a3ad20c | 619 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 620 | { |
71b3e0c1 | 621 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
622 | struct platform_driver *pdrv = to_platform_driver(drv); |
623 | ||
624 | /* match against the id table first */ | |
625 | if (pdrv->id_table) | |
626 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 627 | |
57fee4a5 | 628 | /* fall-back to driver name match */ |
1e0b2cf9 | 629 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
630 | } |
631 | ||
25e18499 RW |
632 | #ifdef CONFIG_PM_SLEEP |
633 | ||
634 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 LT |
635 | { |
636 | int ret = 0; | |
637 | ||
9480e307 | 638 | if (dev->driver && dev->driver->suspend) |
386415d8 DB |
639 | ret = dev->driver->suspend(dev, mesg); |
640 | ||
641 | return ret; | |
642 | } | |
643 | ||
25e18499 | 644 | static int platform_legacy_suspend_late(struct device *dev, pm_message_t mesg) |
386415d8 | 645 | { |
71b3e0c1 EM |
646 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
647 | struct platform_device *pdev = to_platform_device(dev); | |
386415d8 DB |
648 | int ret = 0; |
649 | ||
71b3e0c1 EM |
650 | if (dev->driver && pdrv->suspend_late) |
651 | ret = pdrv->suspend_late(pdev, mesg); | |
386415d8 DB |
652 | |
653 | return ret; | |
654 | } | |
655 | ||
25e18499 | 656 | static int platform_legacy_resume_early(struct device *dev) |
386415d8 | 657 | { |
71b3e0c1 EM |
658 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
659 | struct platform_device *pdev = to_platform_device(dev); | |
386415d8 DB |
660 | int ret = 0; |
661 | ||
71b3e0c1 EM |
662 | if (dev->driver && pdrv->resume_early) |
663 | ret = pdrv->resume_early(pdev); | |
9480e307 | 664 | |
1da177e4 LT |
665 | return ret; |
666 | } | |
667 | ||
25e18499 | 668 | static int platform_legacy_resume(struct device *dev) |
1da177e4 LT |
669 | { |
670 | int ret = 0; | |
671 | ||
9480e307 RK |
672 | if (dev->driver && dev->driver->resume) |
673 | ret = dev->driver->resume(dev); | |
674 | ||
1da177e4 LT |
675 | return ret; |
676 | } | |
677 | ||
25e18499 RW |
678 | static int platform_pm_prepare(struct device *dev) |
679 | { | |
680 | struct device_driver *drv = dev->driver; | |
681 | int ret = 0; | |
682 | ||
683 | if (drv && drv->pm && drv->pm->prepare) | |
684 | ret = drv->pm->prepare(dev); | |
685 | ||
686 | return ret; | |
687 | } | |
688 | ||
689 | static void platform_pm_complete(struct device *dev) | |
690 | { | |
691 | struct device_driver *drv = dev->driver; | |
692 | ||
693 | if (drv && drv->pm && drv->pm->complete) | |
694 | drv->pm->complete(dev); | |
695 | } | |
696 | ||
697 | #ifdef CONFIG_SUSPEND | |
698 | ||
699 | static int platform_pm_suspend(struct device *dev) | |
700 | { | |
701 | struct device_driver *drv = dev->driver; | |
702 | int ret = 0; | |
703 | ||
adf09493 RW |
704 | if (!drv) |
705 | return 0; | |
706 | ||
707 | if (drv->pm) { | |
25e18499 RW |
708 | if (drv->pm->suspend) |
709 | ret = drv->pm->suspend(dev); | |
710 | } else { | |
711 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
712 | } | |
713 | ||
714 | return ret; | |
715 | } | |
716 | ||
717 | static int platform_pm_suspend_noirq(struct device *dev) | |
718 | { | |
adf09493 | 719 | struct device_driver *drv = dev->driver; |
25e18499 RW |
720 | int ret = 0; |
721 | ||
adf09493 | 722 | if (!drv) |
25e18499 RW |
723 | return 0; |
724 | ||
adf09493 RW |
725 | if (drv->pm) { |
726 | if (drv->pm->suspend_noirq) | |
727 | ret = drv->pm->suspend_noirq(dev); | |
25e18499 RW |
728 | } else { |
729 | ret = platform_legacy_suspend_late(dev, PMSG_SUSPEND); | |
730 | } | |
731 | ||
732 | return ret; | |
733 | } | |
734 | ||
735 | static int platform_pm_resume(struct device *dev) | |
736 | { | |
737 | struct device_driver *drv = dev->driver; | |
738 | int ret = 0; | |
739 | ||
adf09493 RW |
740 | if (!drv) |
741 | return 0; | |
742 | ||
743 | if (drv->pm) { | |
25e18499 RW |
744 | if (drv->pm->resume) |
745 | ret = drv->pm->resume(dev); | |
746 | } else { | |
747 | ret = platform_legacy_resume(dev); | |
748 | } | |
749 | ||
750 | return ret; | |
751 | } | |
752 | ||
753 | static int platform_pm_resume_noirq(struct device *dev) | |
754 | { | |
adf09493 | 755 | struct device_driver *drv = dev->driver; |
25e18499 RW |
756 | int ret = 0; |
757 | ||
adf09493 | 758 | if (!drv) |
25e18499 RW |
759 | return 0; |
760 | ||
adf09493 RW |
761 | if (drv->pm) { |
762 | if (drv->pm->resume_noirq) | |
763 | ret = drv->pm->resume_noirq(dev); | |
25e18499 RW |
764 | } else { |
765 | ret = platform_legacy_resume_early(dev); | |
766 | } | |
767 | ||
768 | return ret; | |
769 | } | |
770 | ||
771 | #else /* !CONFIG_SUSPEND */ | |
772 | ||
773 | #define platform_pm_suspend NULL | |
774 | #define platform_pm_resume NULL | |
775 | #define platform_pm_suspend_noirq NULL | |
776 | #define platform_pm_resume_noirq NULL | |
777 | ||
778 | #endif /* !CONFIG_SUSPEND */ | |
779 | ||
780 | #ifdef CONFIG_HIBERNATION | |
781 | ||
782 | static int platform_pm_freeze(struct device *dev) | |
783 | { | |
784 | struct device_driver *drv = dev->driver; | |
785 | int ret = 0; | |
786 | ||
787 | if (!drv) | |
788 | return 0; | |
789 | ||
790 | if (drv->pm) { | |
791 | if (drv->pm->freeze) | |
792 | ret = drv->pm->freeze(dev); | |
793 | } else { | |
794 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
795 | } | |
796 | ||
797 | return ret; | |
798 | } | |
799 | ||
800 | static int platform_pm_freeze_noirq(struct device *dev) | |
801 | { | |
adf09493 | 802 | struct device_driver *drv = dev->driver; |
25e18499 RW |
803 | int ret = 0; |
804 | ||
adf09493 | 805 | if (!drv) |
25e18499 RW |
806 | return 0; |
807 | ||
adf09493 RW |
808 | if (drv->pm) { |
809 | if (drv->pm->freeze_noirq) | |
810 | ret = drv->pm->freeze_noirq(dev); | |
25e18499 RW |
811 | } else { |
812 | ret = platform_legacy_suspend_late(dev, PMSG_FREEZE); | |
813 | } | |
814 | ||
815 | return ret; | |
816 | } | |
817 | ||
818 | static int platform_pm_thaw(struct device *dev) | |
819 | { | |
820 | struct device_driver *drv = dev->driver; | |
821 | int ret = 0; | |
822 | ||
adf09493 RW |
823 | if (!drv) |
824 | return 0; | |
825 | ||
826 | if (drv->pm) { | |
25e18499 RW |
827 | if (drv->pm->thaw) |
828 | ret = drv->pm->thaw(dev); | |
829 | } else { | |
830 | ret = platform_legacy_resume(dev); | |
831 | } | |
832 | ||
833 | return ret; | |
834 | } | |
835 | ||
836 | static int platform_pm_thaw_noirq(struct device *dev) | |
837 | { | |
adf09493 | 838 | struct device_driver *drv = dev->driver; |
25e18499 RW |
839 | int ret = 0; |
840 | ||
adf09493 | 841 | if (!drv) |
25e18499 RW |
842 | return 0; |
843 | ||
adf09493 RW |
844 | if (drv->pm) { |
845 | if (drv->pm->thaw_noirq) | |
846 | ret = drv->pm->thaw_noirq(dev); | |
25e18499 RW |
847 | } else { |
848 | ret = platform_legacy_resume_early(dev); | |
849 | } | |
850 | ||
851 | return ret; | |
852 | } | |
853 | ||
854 | static int platform_pm_poweroff(struct device *dev) | |
855 | { | |
856 | struct device_driver *drv = dev->driver; | |
857 | int ret = 0; | |
858 | ||
adf09493 RW |
859 | if (!drv) |
860 | return 0; | |
861 | ||
862 | if (drv->pm) { | |
25e18499 RW |
863 | if (drv->pm->poweroff) |
864 | ret = drv->pm->poweroff(dev); | |
865 | } else { | |
866 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
867 | } | |
868 | ||
869 | return ret; | |
870 | } | |
871 | ||
872 | static int platform_pm_poweroff_noirq(struct device *dev) | |
873 | { | |
adf09493 | 874 | struct device_driver *drv = dev->driver; |
25e18499 RW |
875 | int ret = 0; |
876 | ||
adf09493 | 877 | if (!drv) |
25e18499 RW |
878 | return 0; |
879 | ||
adf09493 RW |
880 | if (drv->pm) { |
881 | if (drv->pm->poweroff_noirq) | |
882 | ret = drv->pm->poweroff_noirq(dev); | |
25e18499 RW |
883 | } else { |
884 | ret = platform_legacy_suspend_late(dev, PMSG_HIBERNATE); | |
885 | } | |
886 | ||
887 | return ret; | |
888 | } | |
889 | ||
890 | static int platform_pm_restore(struct device *dev) | |
891 | { | |
892 | struct device_driver *drv = dev->driver; | |
893 | int ret = 0; | |
894 | ||
adf09493 RW |
895 | if (!drv) |
896 | return 0; | |
897 | ||
898 | if (drv->pm) { | |
25e18499 RW |
899 | if (drv->pm->restore) |
900 | ret = drv->pm->restore(dev); | |
901 | } else { | |
902 | ret = platform_legacy_resume(dev); | |
903 | } | |
904 | ||
905 | return ret; | |
906 | } | |
907 | ||
908 | static int platform_pm_restore_noirq(struct device *dev) | |
909 | { | |
adf09493 | 910 | struct device_driver *drv = dev->driver; |
25e18499 RW |
911 | int ret = 0; |
912 | ||
adf09493 | 913 | if (!drv) |
25e18499 RW |
914 | return 0; |
915 | ||
adf09493 RW |
916 | if (drv->pm) { |
917 | if (drv->pm->restore_noirq) | |
918 | ret = drv->pm->restore_noirq(dev); | |
25e18499 RW |
919 | } else { |
920 | ret = platform_legacy_resume_early(dev); | |
921 | } | |
922 | ||
923 | return ret; | |
924 | } | |
925 | ||
926 | #else /* !CONFIG_HIBERNATION */ | |
927 | ||
928 | #define platform_pm_freeze NULL | |
929 | #define platform_pm_thaw NULL | |
930 | #define platform_pm_poweroff NULL | |
931 | #define platform_pm_restore NULL | |
932 | #define platform_pm_freeze_noirq NULL | |
933 | #define platform_pm_thaw_noirq NULL | |
934 | #define platform_pm_poweroff_noirq NULL | |
935 | #define platform_pm_restore_noirq NULL | |
936 | ||
937 | #endif /* !CONFIG_HIBERNATION */ | |
938 | ||
adf09493 RW |
939 | static struct dev_pm_ops platform_dev_pm_ops = { |
940 | .prepare = platform_pm_prepare, | |
941 | .complete = platform_pm_complete, | |
942 | .suspend = platform_pm_suspend, | |
943 | .resume = platform_pm_resume, | |
944 | .freeze = platform_pm_freeze, | |
945 | .thaw = platform_pm_thaw, | |
946 | .poweroff = platform_pm_poweroff, | |
947 | .restore = platform_pm_restore, | |
25e18499 RW |
948 | .suspend_noirq = platform_pm_suspend_noirq, |
949 | .resume_noirq = platform_pm_resume_noirq, | |
950 | .freeze_noirq = platform_pm_freeze_noirq, | |
951 | .thaw_noirq = platform_pm_thaw_noirq, | |
952 | .poweroff_noirq = platform_pm_poweroff_noirq, | |
953 | .restore_noirq = platform_pm_restore_noirq, | |
954 | }; | |
955 | ||
adf09493 | 956 | #define PLATFORM_PM_OPS_PTR (&platform_dev_pm_ops) |
25e18499 RW |
957 | |
958 | #else /* !CONFIG_PM_SLEEP */ | |
959 | ||
960 | #define PLATFORM_PM_OPS_PTR NULL | |
961 | ||
962 | #endif /* !CONFIG_PM_SLEEP */ | |
963 | ||
1da177e4 LT |
964 | struct bus_type platform_bus_type = { |
965 | .name = "platform", | |
a0245f7a | 966 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 967 | .match = platform_match, |
a0245f7a | 968 | .uevent = platform_uevent, |
25e18499 | 969 | .pm = PLATFORM_PM_OPS_PTR, |
1da177e4 | 970 | }; |
a96b2042 | 971 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
972 | |
973 | int __init platform_bus_init(void) | |
974 | { | |
fbfb1445 CH |
975 | int error; |
976 | ||
13977091 MD |
977 | early_platform_cleanup(); |
978 | ||
fbfb1445 CH |
979 | error = device_register(&platform_bus); |
980 | if (error) | |
981 | return error; | |
982 | error = bus_register(&platform_bus_type); | |
983 | if (error) | |
984 | device_unregister(&platform_bus); | |
985 | return error; | |
1da177e4 LT |
986 | } |
987 | ||
988 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
989 | u64 dma_get_required_mask(struct device *dev) | |
990 | { | |
991 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
992 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
993 | u64 mask; | |
994 | ||
995 | if (!high_totalram) { | |
996 | /* convert to mask just covering totalram */ | |
997 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
998 | low_totalram += low_totalram - 1; | |
999 | mask = low_totalram; | |
1000 | } else { | |
1001 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
1002 | high_totalram += high_totalram - 1; | |
1003 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
1004 | } | |
e88a0c2c | 1005 | return mask; |
1da177e4 LT |
1006 | } |
1007 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
1008 | #endif | |
13977091 MD |
1009 | |
1010 | static __initdata LIST_HEAD(early_platform_driver_list); | |
1011 | static __initdata LIST_HEAD(early_platform_device_list); | |
1012 | ||
1013 | /** | |
1014 | * early_platform_driver_register | |
d86c1302 | 1015 | * @epdrv: early_platform driver structure |
13977091 MD |
1016 | * @buf: string passed from early_param() |
1017 | */ | |
1018 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
1019 | char *buf) | |
1020 | { | |
1021 | unsigned long index; | |
1022 | int n; | |
1023 | ||
1024 | /* Simply add the driver to the end of the global list. | |
1025 | * Drivers will by default be put on the list in compiled-in order. | |
1026 | */ | |
1027 | if (!epdrv->list.next) { | |
1028 | INIT_LIST_HEAD(&epdrv->list); | |
1029 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
1030 | } | |
1031 | ||
1032 | /* If the user has specified device then make sure the driver | |
1033 | * gets prioritized. The driver of the last device specified on | |
1034 | * command line will be put first on the list. | |
1035 | */ | |
1036 | n = strlen(epdrv->pdrv->driver.name); | |
1037 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
1038 | list_move(&epdrv->list, &early_platform_driver_list); | |
1039 | ||
1040 | if (!strcmp(buf, epdrv->pdrv->driver.name)) | |
1041 | epdrv->requested_id = -1; | |
1042 | else if (buf[n] == '.' && strict_strtoul(&buf[n + 1], 10, | |
1043 | &index) == 0) | |
1044 | epdrv->requested_id = index; | |
1045 | else | |
1046 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
1047 | } | |
1048 | ||
1049 | return 0; | |
1050 | } | |
1051 | ||
1052 | /** | |
1053 | * early_platform_add_devices - add a numbers of early platform devices | |
1054 | * @devs: array of early platform devices to add | |
1055 | * @num: number of early platform devices in array | |
1056 | */ | |
1057 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1058 | { | |
1059 | struct device *dev; | |
1060 | int i; | |
1061 | ||
1062 | /* simply add the devices to list */ | |
1063 | for (i = 0; i < num; i++) { | |
1064 | dev = &devs[i]->dev; | |
1065 | ||
1066 | if (!dev->devres_head.next) { | |
1067 | INIT_LIST_HEAD(&dev->devres_head); | |
1068 | list_add_tail(&dev->devres_head, | |
1069 | &early_platform_device_list); | |
1070 | } | |
1071 | } | |
1072 | } | |
1073 | ||
1074 | /** | |
1075 | * early_platform_driver_register_all | |
1076 | * @class_str: string to identify early platform driver class | |
1077 | */ | |
1078 | void __init early_platform_driver_register_all(char *class_str) | |
1079 | { | |
1080 | /* The "class_str" parameter may or may not be present on the kernel | |
1081 | * command line. If it is present then there may be more than one | |
1082 | * matching parameter. | |
1083 | * | |
1084 | * Since we register our early platform drivers using early_param() | |
1085 | * we need to make sure that they also get registered in the case | |
1086 | * when the parameter is missing from the kernel command line. | |
1087 | * | |
1088 | * We use parse_early_options() to make sure the early_param() gets | |
1089 | * called at least once. The early_param() may be called more than | |
1090 | * once since the name of the preferred device may be specified on | |
1091 | * the kernel command line. early_platform_driver_register() handles | |
1092 | * this case for us. | |
1093 | */ | |
1094 | parse_early_options(class_str); | |
1095 | } | |
1096 | ||
1097 | /** | |
1098 | * early_platform_match | |
d86c1302 | 1099 | * @epdrv: early platform driver structure |
13977091 MD |
1100 | * @id: id to match against |
1101 | */ | |
1102 | static __init struct platform_device * | |
1103 | early_platform_match(struct early_platform_driver *epdrv, int id) | |
1104 | { | |
1105 | struct platform_device *pd; | |
1106 | ||
1107 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1108 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1109 | if (pd->id == id) | |
1110 | return pd; | |
1111 | ||
1112 | return NULL; | |
1113 | } | |
1114 | ||
1115 | /** | |
1116 | * early_platform_left | |
d86c1302 | 1117 | * @epdrv: early platform driver structure |
13977091 MD |
1118 | * @id: return true if id or above exists |
1119 | */ | |
1120 | static __init int early_platform_left(struct early_platform_driver *epdrv, | |
1121 | int id) | |
1122 | { | |
1123 | struct platform_device *pd; | |
1124 | ||
1125 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1126 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1127 | if (pd->id >= id) | |
1128 | return 1; | |
1129 | ||
1130 | return 0; | |
1131 | } | |
1132 | ||
1133 | /** | |
1134 | * early_platform_driver_probe_id | |
1135 | * @class_str: string to identify early platform driver class | |
1136 | * @id: id to match against | |
1137 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1138 | */ | |
1139 | static int __init early_platform_driver_probe_id(char *class_str, | |
1140 | int id, | |
1141 | int nr_probe) | |
1142 | { | |
1143 | struct early_platform_driver *epdrv; | |
1144 | struct platform_device *match; | |
1145 | int match_id; | |
1146 | int n = 0; | |
1147 | int left = 0; | |
1148 | ||
1149 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1150 | /* only use drivers matching our class_str */ | |
1151 | if (strcmp(class_str, epdrv->class_str)) | |
1152 | continue; | |
1153 | ||
1154 | if (id == -2) { | |
1155 | match_id = epdrv->requested_id; | |
1156 | left = 1; | |
1157 | ||
1158 | } else { | |
1159 | match_id = id; | |
1160 | left += early_platform_left(epdrv, id); | |
1161 | ||
1162 | /* skip requested id */ | |
1163 | switch (epdrv->requested_id) { | |
1164 | case EARLY_PLATFORM_ID_ERROR: | |
1165 | case EARLY_PLATFORM_ID_UNSET: | |
1166 | break; | |
1167 | default: | |
1168 | if (epdrv->requested_id == id) | |
1169 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1170 | } | |
1171 | } | |
1172 | ||
1173 | switch (match_id) { | |
1174 | case EARLY_PLATFORM_ID_ERROR: | |
1175 | pr_warning("%s: unable to parse %s parameter\n", | |
1176 | class_str, epdrv->pdrv->driver.name); | |
1177 | /* fall-through */ | |
1178 | case EARLY_PLATFORM_ID_UNSET: | |
1179 | match = NULL; | |
1180 | break; | |
1181 | default: | |
1182 | match = early_platform_match(epdrv, match_id); | |
1183 | } | |
1184 | ||
1185 | if (match) { | |
1186 | if (epdrv->pdrv->probe(match)) | |
1187 | pr_warning("%s: unable to probe %s early.\n", | |
1188 | class_str, match->name); | |
1189 | else | |
1190 | n++; | |
1191 | } | |
1192 | ||
1193 | if (n >= nr_probe) | |
1194 | break; | |
1195 | } | |
1196 | ||
1197 | if (left) | |
1198 | return n; | |
1199 | else | |
1200 | return -ENODEV; | |
1201 | } | |
1202 | ||
1203 | /** | |
1204 | * early_platform_driver_probe | |
1205 | * @class_str: string to identify early platform driver class | |
1206 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1207 | * @user_only: only probe user specified early platform devices | |
1208 | */ | |
1209 | int __init early_platform_driver_probe(char *class_str, | |
1210 | int nr_probe, | |
1211 | int user_only) | |
1212 | { | |
1213 | int k, n, i; | |
1214 | ||
1215 | n = 0; | |
1216 | for (i = -2; n < nr_probe; i++) { | |
1217 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1218 | ||
1219 | if (k < 0) | |
1220 | break; | |
1221 | ||
1222 | n += k; | |
1223 | ||
1224 | if (user_only) | |
1225 | break; | |
1226 | } | |
1227 | ||
1228 | return n; | |
1229 | } | |
1230 | ||
1231 | /** | |
1232 | * early_platform_cleanup - clean up early platform code | |
1233 | */ | |
1234 | void __init early_platform_cleanup(void) | |
1235 | { | |
1236 | struct platform_device *pd, *pd2; | |
1237 | ||
1238 | /* clean up the devres list used to chain devices */ | |
1239 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1240 | dev.devres_head) { | |
1241 | list_del(&pd->dev.devres_head); | |
1242 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1243 | } | |
1244 | } | |
1245 |