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; | |
006f4571 | 220 | pdev->platform_data = d; |
37c12e74 RK |
221 | } |
222 | return d ? 0 : -ENOMEM; | |
223 | } | |
224 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
225 | ||
226 | /** | |
4a3ad20c GKH |
227 | * platform_device_add - add a platform device to device hierarchy |
228 | * @pdev: platform device we're adding | |
1da177e4 | 229 | * |
4a3ad20c GKH |
230 | * This is part 2 of platform_device_register(), though may be called |
231 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 232 | */ |
37c12e74 | 233 | int platform_device_add(struct platform_device *pdev) |
1da177e4 LT |
234 | { |
235 | int i, ret = 0; | |
236 | ||
237 | if (!pdev) | |
238 | return -EINVAL; | |
239 | ||
240 | if (!pdev->dev.parent) | |
241 | pdev->dev.parent = &platform_bus; | |
242 | ||
243 | pdev->dev.bus = &platform_bus_type; | |
244 | ||
245 | if (pdev->id != -1) | |
1e0b2cf9 | 246 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
1da177e4 | 247 | else |
1e0b2cf9 | 248 | dev_set_name(&pdev->dev, pdev->name); |
1da177e4 | 249 | |
bee86321 | 250 | pdev->platform_data = pdev->dev.platform_data; |
006f4571 | 251 | |
1da177e4 LT |
252 | for (i = 0; i < pdev->num_resources; i++) { |
253 | struct resource *p, *r = &pdev->resource[i]; | |
254 | ||
255 | if (r->name == NULL) | |
1e0b2cf9 | 256 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
257 | |
258 | p = r->parent; | |
259 | if (!p) { | |
c9f66169 | 260 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 261 | p = &iomem_resource; |
c9f66169 | 262 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
263 | p = &ioport_resource; |
264 | } | |
265 | ||
d960bb4d | 266 | if (p && insert_resource(p, r)) { |
1da177e4 LT |
267 | printk(KERN_ERR |
268 | "%s: failed to claim resource %d\n", | |
1e0b2cf9 | 269 | dev_name(&pdev->dev), i); |
1da177e4 LT |
270 | ret = -EBUSY; |
271 | goto failed; | |
272 | } | |
273 | } | |
274 | ||
275 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 276 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 277 | |
e3915532 | 278 | ret = device_add(&pdev->dev); |
1da177e4 LT |
279 | if (ret == 0) |
280 | return ret; | |
281 | ||
282 | failed: | |
c9f66169 MD |
283 | while (--i >= 0) { |
284 | struct resource *r = &pdev->resource[i]; | |
285 | unsigned long type = resource_type(r); | |
286 | ||
287 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
288 | release_resource(r); | |
289 | } | |
290 | ||
1da177e4 LT |
291 | return ret; |
292 | } | |
37c12e74 RK |
293 | EXPORT_SYMBOL_GPL(platform_device_add); |
294 | ||
295 | /** | |
4a3ad20c GKH |
296 | * platform_device_del - remove a platform-level device |
297 | * @pdev: platform device we're removing | |
1da177e4 | 298 | * |
4a3ad20c GKH |
299 | * Note that this function will also release all memory- and port-based |
300 | * resources owned by the device (@dev->resource). This function must | |
301 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 302 | */ |
93ce3061 | 303 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
304 | { |
305 | int i; | |
306 | ||
307 | if (pdev) { | |
dc4c15d4 JD |
308 | device_del(&pdev->dev); |
309 | ||
1da177e4 LT |
310 | for (i = 0; i < pdev->num_resources; i++) { |
311 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
312 | unsigned long type = resource_type(r); |
313 | ||
314 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
315 | release_resource(r); |
316 | } | |
1da177e4 LT |
317 | } |
318 | } | |
93ce3061 DT |
319 | EXPORT_SYMBOL_GPL(platform_device_del); |
320 | ||
321 | /** | |
4a3ad20c GKH |
322 | * platform_device_register - add a platform-level device |
323 | * @pdev: platform device we're adding | |
93ce3061 | 324 | */ |
4a3ad20c | 325 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
326 | { |
327 | device_initialize(&pdev->dev); | |
328 | return platform_device_add(pdev); | |
329 | } | |
a96b2042 | 330 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
331 | |
332 | /** | |
4a3ad20c GKH |
333 | * platform_device_unregister - unregister a platform-level device |
334 | * @pdev: platform device we're unregistering | |
93ce3061 | 335 | * |
4a3ad20c GKH |
336 | * Unregistration is done in 2 steps. First we release all resources |
337 | * and remove it from the subsystem, then we drop reference count by | |
338 | * calling platform_device_put(). | |
93ce3061 | 339 | */ |
4a3ad20c | 340 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
341 | { |
342 | platform_device_del(pdev); | |
343 | platform_device_put(pdev); | |
344 | } | |
a96b2042 | 345 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 346 | |
1da177e4 | 347 | /** |
4a3ad20c GKH |
348 | * platform_device_register_simple |
349 | * @name: base name of the device we're adding | |
350 | * @id: instance id | |
351 | * @res: set of resources that needs to be allocated for the device | |
352 | * @num: number of resources | |
1da177e4 | 353 | * |
4a3ad20c GKH |
354 | * This function creates a simple platform device that requires minimal |
355 | * resource and memory management. Canned release function freeing memory | |
356 | * allocated for the device allows drivers using such devices to be | |
357 | * unloaded without waiting for the last reference to the device to be | |
358 | * dropped. | |
49a4ec18 | 359 | * |
4a3ad20c GKH |
360 | * This interface is primarily intended for use with legacy drivers which |
361 | * probe hardware directly. Because such drivers create sysfs device nodes | |
362 | * themselves, rather than letting system infrastructure handle such device | |
363 | * enumeration tasks, they don't fully conform to the Linux driver model. | |
364 | * In particular, when such drivers are built as modules, they can't be | |
365 | * "hotplugged". | |
1da177e4 | 366 | */ |
4a3ad20c GKH |
367 | struct platform_device *platform_device_register_simple(const char *name, |
368 | int id, | |
369 | struct resource *res, | |
370 | unsigned int num) | |
1da177e4 | 371 | { |
37c12e74 | 372 | struct platform_device *pdev; |
1da177e4 LT |
373 | int retval; |
374 | ||
37c12e74 RK |
375 | pdev = platform_device_alloc(name, id); |
376 | if (!pdev) { | |
1da177e4 LT |
377 | retval = -ENOMEM; |
378 | goto error; | |
379 | } | |
380 | ||
1da177e4 | 381 | if (num) { |
37c12e74 RK |
382 | retval = platform_device_add_resources(pdev, res, num); |
383 | if (retval) | |
384 | goto error; | |
1da177e4 LT |
385 | } |
386 | ||
37c12e74 | 387 | retval = platform_device_add(pdev); |
1da177e4 LT |
388 | if (retval) |
389 | goto error; | |
390 | ||
37c12e74 | 391 | return pdev; |
1da177e4 LT |
392 | |
393 | error: | |
37c12e74 | 394 | platform_device_put(pdev); |
1da177e4 LT |
395 | return ERR_PTR(retval); |
396 | } | |
a96b2042 | 397 | EXPORT_SYMBOL_GPL(platform_device_register_simple); |
1da177e4 | 398 | |
d8bf2540 DB |
399 | /** |
400 | * platform_device_register_data | |
401 | * @parent: parent device for the device we're adding | |
402 | * @name: base name of the device we're adding | |
403 | * @id: instance id | |
404 | * @data: platform specific data for this platform device | |
405 | * @size: size of platform specific data | |
406 | * | |
407 | * This function creates a simple platform device that requires minimal | |
408 | * resource and memory management. Canned release function freeing memory | |
409 | * allocated for the device allows drivers using such devices to be | |
410 | * unloaded without waiting for the last reference to the device to be | |
411 | * dropped. | |
412 | */ | |
413 | struct platform_device *platform_device_register_data( | |
414 | struct device *parent, | |
415 | const char *name, int id, | |
416 | const void *data, size_t size) | |
417 | { | |
418 | struct platform_device *pdev; | |
419 | int retval; | |
420 | ||
421 | pdev = platform_device_alloc(name, id); | |
422 | if (!pdev) { | |
423 | retval = -ENOMEM; | |
424 | goto error; | |
425 | } | |
426 | ||
427 | pdev->dev.parent = parent; | |
428 | ||
429 | if (size) { | |
430 | retval = platform_device_add_data(pdev, data, size); | |
431 | if (retval) | |
432 | goto error; | |
433 | } | |
434 | ||
435 | retval = platform_device_add(pdev); | |
436 | if (retval) | |
437 | goto error; | |
438 | ||
439 | return pdev; | |
440 | ||
441 | error: | |
442 | platform_device_put(pdev); | |
443 | return ERR_PTR(retval); | |
444 | } | |
445 | ||
00d3dcdd RK |
446 | static int platform_drv_probe(struct device *_dev) |
447 | { | |
448 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
449 | struct platform_device *dev = to_platform_device(_dev); | |
450 | ||
451 | return drv->probe(dev); | |
452 | } | |
453 | ||
c67334fb DB |
454 | static int platform_drv_probe_fail(struct device *_dev) |
455 | { | |
456 | return -ENXIO; | |
457 | } | |
458 | ||
00d3dcdd RK |
459 | static int platform_drv_remove(struct device *_dev) |
460 | { | |
461 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
462 | struct platform_device *dev = to_platform_device(_dev); | |
463 | ||
464 | return drv->remove(dev); | |
465 | } | |
466 | ||
467 | static void platform_drv_shutdown(struct device *_dev) | |
468 | { | |
469 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
470 | struct platform_device *dev = to_platform_device(_dev); | |
471 | ||
472 | drv->shutdown(dev); | |
473 | } | |
474 | ||
475 | static int platform_drv_suspend(struct device *_dev, pm_message_t state) | |
476 | { | |
477 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
478 | struct platform_device *dev = to_platform_device(_dev); | |
479 | ||
480 | return drv->suspend(dev, state); | |
481 | } | |
482 | ||
483 | static int platform_drv_resume(struct device *_dev) | |
484 | { | |
485 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
486 | struct platform_device *dev = to_platform_device(_dev); | |
487 | ||
488 | return drv->resume(dev); | |
489 | } | |
490 | ||
491 | /** | |
4a3ad20c GKH |
492 | * platform_driver_register |
493 | * @drv: platform driver structure | |
00d3dcdd RK |
494 | */ |
495 | int platform_driver_register(struct platform_driver *drv) | |
496 | { | |
497 | drv->driver.bus = &platform_bus_type; | |
498 | if (drv->probe) | |
499 | drv->driver.probe = platform_drv_probe; | |
500 | if (drv->remove) | |
501 | drv->driver.remove = platform_drv_remove; | |
502 | if (drv->shutdown) | |
503 | drv->driver.shutdown = platform_drv_shutdown; | |
504 | if (drv->suspend) | |
505 | drv->driver.suspend = platform_drv_suspend; | |
506 | if (drv->resume) | |
507 | drv->driver.resume = platform_drv_resume; | |
508 | return driver_register(&drv->driver); | |
509 | } | |
510 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
511 | ||
512 | /** | |
4a3ad20c GKH |
513 | * platform_driver_unregister |
514 | * @drv: platform driver structure | |
00d3dcdd RK |
515 | */ |
516 | void platform_driver_unregister(struct platform_driver *drv) | |
517 | { | |
518 | driver_unregister(&drv->driver); | |
519 | } | |
520 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
521 | ||
c67334fb DB |
522 | /** |
523 | * platform_driver_probe - register driver for non-hotpluggable device | |
524 | * @drv: platform driver structure | |
525 | * @probe: the driver probe routine, probably from an __init section | |
526 | * | |
527 | * Use this instead of platform_driver_register() when you know the device | |
528 | * is not hotpluggable and has already been registered, and you want to | |
529 | * remove its run-once probe() infrastructure from memory after the driver | |
530 | * has bound to the device. | |
531 | * | |
532 | * One typical use for this would be with drivers for controllers integrated | |
533 | * into system-on-chip processors, where the controller devices have been | |
534 | * configured as part of board setup. | |
535 | * | |
536 | * Returns zero if the driver registered and bound to a device, else returns | |
537 | * a negative error code and with the driver not registered. | |
538 | */ | |
c63e0783 | 539 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
540 | int (*probe)(struct platform_device *)) |
541 | { | |
542 | int retval, code; | |
543 | ||
544 | /* temporary section violation during probe() */ | |
545 | drv->probe = probe; | |
546 | retval = code = platform_driver_register(drv); | |
547 | ||
548 | /* Fixup that section violation, being paranoid about code scanning | |
549 | * the list of drivers in order to probe new devices. Check to see | |
550 | * if the probe was successful, and make sure any forced probes of | |
551 | * new devices fail. | |
552 | */ | |
c6f7e72a | 553 | spin_lock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb | 554 | drv->probe = NULL; |
e5dd1278 | 555 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
556 | retval = -ENODEV; |
557 | drv->driver.probe = platform_drv_probe_fail; | |
c6f7e72a | 558 | spin_unlock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb DB |
559 | |
560 | if (code != retval) | |
561 | platform_driver_unregister(drv); | |
562 | return retval; | |
563 | } | |
564 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 565 | |
a0245f7a DB |
566 | /* modalias support enables more hands-off userspace setup: |
567 | * (a) environment variable lets new-style hotplug events work once system is | |
568 | * fully running: "modprobe $MODALIAS" | |
569 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
570 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
571 | */ | |
4a3ad20c GKH |
572 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
573 | char *buf) | |
a0245f7a DB |
574 | { |
575 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 576 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
577 | |
578 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
579 | } | |
580 | ||
581 | static struct device_attribute platform_dev_attrs[] = { | |
582 | __ATTR_RO(modalias), | |
583 | __ATTR_NULL, | |
584 | }; | |
585 | ||
7eff2e7a | 586 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
587 | { |
588 | struct platform_device *pdev = to_platform_device(dev); | |
589 | ||
57fee4a5 EM |
590 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
591 | (pdev->id_entry) ? pdev->id_entry->name : pdev->name); | |
a0245f7a DB |
592 | return 0; |
593 | } | |
594 | ||
57fee4a5 EM |
595 | static const struct platform_device_id *platform_match_id( |
596 | struct platform_device_id *id, | |
597 | struct platform_device *pdev) | |
598 | { | |
599 | while (id->name[0]) { | |
600 | if (strcmp(pdev->name, id->name) == 0) { | |
601 | pdev->id_entry = id; | |
602 | return id; | |
603 | } | |
604 | id++; | |
605 | } | |
606 | return NULL; | |
607 | } | |
608 | ||
1da177e4 | 609 | /** |
4a3ad20c GKH |
610 | * platform_match - bind platform device to platform driver. |
611 | * @dev: device. | |
612 | * @drv: driver. | |
1da177e4 | 613 | * |
4a3ad20c GKH |
614 | * Platform device IDs are assumed to be encoded like this: |
615 | * "<name><instance>", where <name> is a short description of the type of | |
616 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
617 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
618 | * "<name>". So, extract the <name> from the platform_device structure, | |
619 | * and compare it against the name of the driver. Return whether they match | |
620 | * or not. | |
1da177e4 | 621 | */ |
4a3ad20c | 622 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 623 | { |
71b3e0c1 | 624 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
625 | struct platform_driver *pdrv = to_platform_driver(drv); |
626 | ||
627 | /* match against the id table first */ | |
628 | if (pdrv->id_table) | |
629 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 630 | |
57fee4a5 | 631 | /* fall-back to driver name match */ |
1e0b2cf9 | 632 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
633 | } |
634 | ||
25e18499 RW |
635 | #ifdef CONFIG_PM_SLEEP |
636 | ||
637 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 LT |
638 | { |
639 | int ret = 0; | |
640 | ||
9480e307 | 641 | if (dev->driver && dev->driver->suspend) |
386415d8 DB |
642 | ret = dev->driver->suspend(dev, mesg); |
643 | ||
644 | return ret; | |
645 | } | |
646 | ||
25e18499 | 647 | static int platform_legacy_suspend_late(struct device *dev, pm_message_t mesg) |
386415d8 | 648 | { |
71b3e0c1 EM |
649 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
650 | struct platform_device *pdev = to_platform_device(dev); | |
386415d8 DB |
651 | int ret = 0; |
652 | ||
71b3e0c1 EM |
653 | if (dev->driver && pdrv->suspend_late) |
654 | ret = pdrv->suspend_late(pdev, mesg); | |
386415d8 DB |
655 | |
656 | return ret; | |
657 | } | |
658 | ||
25e18499 | 659 | static int platform_legacy_resume_early(struct device *dev) |
386415d8 | 660 | { |
71b3e0c1 EM |
661 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
662 | struct platform_device *pdev = to_platform_device(dev); | |
386415d8 DB |
663 | int ret = 0; |
664 | ||
71b3e0c1 EM |
665 | if (dev->driver && pdrv->resume_early) |
666 | ret = pdrv->resume_early(pdev); | |
9480e307 | 667 | |
1da177e4 LT |
668 | return ret; |
669 | } | |
670 | ||
25e18499 | 671 | static int platform_legacy_resume(struct device *dev) |
1da177e4 LT |
672 | { |
673 | int ret = 0; | |
674 | ||
9480e307 RK |
675 | if (dev->driver && dev->driver->resume) |
676 | ret = dev->driver->resume(dev); | |
677 | ||
1da177e4 LT |
678 | return ret; |
679 | } | |
680 | ||
25e18499 RW |
681 | static int platform_pm_prepare(struct device *dev) |
682 | { | |
683 | struct device_driver *drv = dev->driver; | |
684 | int ret = 0; | |
685 | ||
686 | if (drv && drv->pm && drv->pm->prepare) | |
687 | ret = drv->pm->prepare(dev); | |
688 | ||
689 | return ret; | |
690 | } | |
691 | ||
692 | static void platform_pm_complete(struct device *dev) | |
693 | { | |
694 | struct device_driver *drv = dev->driver; | |
695 | ||
696 | if (drv && drv->pm && drv->pm->complete) | |
697 | drv->pm->complete(dev); | |
698 | } | |
699 | ||
700 | #ifdef CONFIG_SUSPEND | |
701 | ||
702 | static int platform_pm_suspend(struct device *dev) | |
703 | { | |
704 | struct device_driver *drv = dev->driver; | |
705 | int ret = 0; | |
706 | ||
adf09493 RW |
707 | if (!drv) |
708 | return 0; | |
709 | ||
710 | if (drv->pm) { | |
25e18499 RW |
711 | if (drv->pm->suspend) |
712 | ret = drv->pm->suspend(dev); | |
713 | } else { | |
714 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
715 | } | |
716 | ||
717 | return ret; | |
718 | } | |
719 | ||
720 | static int platform_pm_suspend_noirq(struct device *dev) | |
721 | { | |
adf09493 | 722 | struct device_driver *drv = dev->driver; |
25e18499 RW |
723 | int ret = 0; |
724 | ||
adf09493 | 725 | if (!drv) |
25e18499 RW |
726 | return 0; |
727 | ||
adf09493 RW |
728 | if (drv->pm) { |
729 | if (drv->pm->suspend_noirq) | |
730 | ret = drv->pm->suspend_noirq(dev); | |
25e18499 RW |
731 | } else { |
732 | ret = platform_legacy_suspend_late(dev, PMSG_SUSPEND); | |
733 | } | |
734 | ||
735 | return ret; | |
736 | } | |
737 | ||
738 | static int platform_pm_resume(struct device *dev) | |
739 | { | |
740 | struct device_driver *drv = dev->driver; | |
741 | int ret = 0; | |
742 | ||
adf09493 RW |
743 | if (!drv) |
744 | return 0; | |
745 | ||
746 | if (drv->pm) { | |
25e18499 RW |
747 | if (drv->pm->resume) |
748 | ret = drv->pm->resume(dev); | |
749 | } else { | |
750 | ret = platform_legacy_resume(dev); | |
751 | } | |
752 | ||
753 | return ret; | |
754 | } | |
755 | ||
756 | static int platform_pm_resume_noirq(struct device *dev) | |
757 | { | |
adf09493 | 758 | struct device_driver *drv = dev->driver; |
25e18499 RW |
759 | int ret = 0; |
760 | ||
adf09493 | 761 | if (!drv) |
25e18499 RW |
762 | return 0; |
763 | ||
adf09493 RW |
764 | if (drv->pm) { |
765 | if (drv->pm->resume_noirq) | |
766 | ret = drv->pm->resume_noirq(dev); | |
25e18499 RW |
767 | } else { |
768 | ret = platform_legacy_resume_early(dev); | |
769 | } | |
770 | ||
771 | return ret; | |
772 | } | |
773 | ||
774 | #else /* !CONFIG_SUSPEND */ | |
775 | ||
776 | #define platform_pm_suspend NULL | |
777 | #define platform_pm_resume NULL | |
778 | #define platform_pm_suspend_noirq NULL | |
779 | #define platform_pm_resume_noirq NULL | |
780 | ||
781 | #endif /* !CONFIG_SUSPEND */ | |
782 | ||
783 | #ifdef CONFIG_HIBERNATION | |
784 | ||
785 | static int platform_pm_freeze(struct device *dev) | |
786 | { | |
787 | struct device_driver *drv = dev->driver; | |
788 | int ret = 0; | |
789 | ||
790 | if (!drv) | |
791 | return 0; | |
792 | ||
793 | if (drv->pm) { | |
794 | if (drv->pm->freeze) | |
795 | ret = drv->pm->freeze(dev); | |
796 | } else { | |
797 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
798 | } | |
799 | ||
800 | return ret; | |
801 | } | |
802 | ||
803 | static int platform_pm_freeze_noirq(struct device *dev) | |
804 | { | |
adf09493 | 805 | struct device_driver *drv = dev->driver; |
25e18499 RW |
806 | int ret = 0; |
807 | ||
adf09493 | 808 | if (!drv) |
25e18499 RW |
809 | return 0; |
810 | ||
adf09493 RW |
811 | if (drv->pm) { |
812 | if (drv->pm->freeze_noirq) | |
813 | ret = drv->pm->freeze_noirq(dev); | |
25e18499 RW |
814 | } else { |
815 | ret = platform_legacy_suspend_late(dev, PMSG_FREEZE); | |
816 | } | |
817 | ||
818 | return ret; | |
819 | } | |
820 | ||
821 | static int platform_pm_thaw(struct device *dev) | |
822 | { | |
823 | struct device_driver *drv = dev->driver; | |
824 | int ret = 0; | |
825 | ||
adf09493 RW |
826 | if (!drv) |
827 | return 0; | |
828 | ||
829 | if (drv->pm) { | |
25e18499 RW |
830 | if (drv->pm->thaw) |
831 | ret = drv->pm->thaw(dev); | |
832 | } else { | |
833 | ret = platform_legacy_resume(dev); | |
834 | } | |
835 | ||
836 | return ret; | |
837 | } | |
838 | ||
839 | static int platform_pm_thaw_noirq(struct device *dev) | |
840 | { | |
adf09493 | 841 | struct device_driver *drv = dev->driver; |
25e18499 RW |
842 | int ret = 0; |
843 | ||
adf09493 | 844 | if (!drv) |
25e18499 RW |
845 | return 0; |
846 | ||
adf09493 RW |
847 | if (drv->pm) { |
848 | if (drv->pm->thaw_noirq) | |
849 | ret = drv->pm->thaw_noirq(dev); | |
25e18499 RW |
850 | } else { |
851 | ret = platform_legacy_resume_early(dev); | |
852 | } | |
853 | ||
854 | return ret; | |
855 | } | |
856 | ||
857 | static int platform_pm_poweroff(struct device *dev) | |
858 | { | |
859 | struct device_driver *drv = dev->driver; | |
860 | int ret = 0; | |
861 | ||
adf09493 RW |
862 | if (!drv) |
863 | return 0; | |
864 | ||
865 | if (drv->pm) { | |
25e18499 RW |
866 | if (drv->pm->poweroff) |
867 | ret = drv->pm->poweroff(dev); | |
868 | } else { | |
869 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
870 | } | |
871 | ||
872 | return ret; | |
873 | } | |
874 | ||
875 | static int platform_pm_poweroff_noirq(struct device *dev) | |
876 | { | |
adf09493 | 877 | struct device_driver *drv = dev->driver; |
25e18499 RW |
878 | int ret = 0; |
879 | ||
adf09493 | 880 | if (!drv) |
25e18499 RW |
881 | return 0; |
882 | ||
adf09493 RW |
883 | if (drv->pm) { |
884 | if (drv->pm->poweroff_noirq) | |
885 | ret = drv->pm->poweroff_noirq(dev); | |
25e18499 RW |
886 | } else { |
887 | ret = platform_legacy_suspend_late(dev, PMSG_HIBERNATE); | |
888 | } | |
889 | ||
890 | return ret; | |
891 | } | |
892 | ||
893 | static int platform_pm_restore(struct device *dev) | |
894 | { | |
895 | struct device_driver *drv = dev->driver; | |
896 | int ret = 0; | |
897 | ||
adf09493 RW |
898 | if (!drv) |
899 | return 0; | |
900 | ||
901 | if (drv->pm) { | |
25e18499 RW |
902 | if (drv->pm->restore) |
903 | ret = drv->pm->restore(dev); | |
904 | } else { | |
905 | ret = platform_legacy_resume(dev); | |
906 | } | |
907 | ||
908 | return ret; | |
909 | } | |
910 | ||
911 | static int platform_pm_restore_noirq(struct device *dev) | |
912 | { | |
adf09493 | 913 | struct device_driver *drv = dev->driver; |
25e18499 RW |
914 | int ret = 0; |
915 | ||
adf09493 | 916 | if (!drv) |
25e18499 RW |
917 | return 0; |
918 | ||
adf09493 RW |
919 | if (drv->pm) { |
920 | if (drv->pm->restore_noirq) | |
921 | ret = drv->pm->restore_noirq(dev); | |
25e18499 RW |
922 | } else { |
923 | ret = platform_legacy_resume_early(dev); | |
924 | } | |
925 | ||
926 | return ret; | |
927 | } | |
928 | ||
929 | #else /* !CONFIG_HIBERNATION */ | |
930 | ||
931 | #define platform_pm_freeze NULL | |
932 | #define platform_pm_thaw NULL | |
933 | #define platform_pm_poweroff NULL | |
934 | #define platform_pm_restore NULL | |
935 | #define platform_pm_freeze_noirq NULL | |
936 | #define platform_pm_thaw_noirq NULL | |
937 | #define platform_pm_poweroff_noirq NULL | |
938 | #define platform_pm_restore_noirq NULL | |
939 | ||
940 | #endif /* !CONFIG_HIBERNATION */ | |
941 | ||
adf09493 RW |
942 | static struct dev_pm_ops platform_dev_pm_ops = { |
943 | .prepare = platform_pm_prepare, | |
944 | .complete = platform_pm_complete, | |
945 | .suspend = platform_pm_suspend, | |
946 | .resume = platform_pm_resume, | |
947 | .freeze = platform_pm_freeze, | |
948 | .thaw = platform_pm_thaw, | |
949 | .poweroff = platform_pm_poweroff, | |
950 | .restore = platform_pm_restore, | |
25e18499 RW |
951 | .suspend_noirq = platform_pm_suspend_noirq, |
952 | .resume_noirq = platform_pm_resume_noirq, | |
953 | .freeze_noirq = platform_pm_freeze_noirq, | |
954 | .thaw_noirq = platform_pm_thaw_noirq, | |
955 | .poweroff_noirq = platform_pm_poweroff_noirq, | |
956 | .restore_noirq = platform_pm_restore_noirq, | |
957 | }; | |
958 | ||
adf09493 | 959 | #define PLATFORM_PM_OPS_PTR (&platform_dev_pm_ops) |
25e18499 RW |
960 | |
961 | #else /* !CONFIG_PM_SLEEP */ | |
962 | ||
963 | #define PLATFORM_PM_OPS_PTR NULL | |
964 | ||
965 | #endif /* !CONFIG_PM_SLEEP */ | |
966 | ||
1da177e4 LT |
967 | struct bus_type platform_bus_type = { |
968 | .name = "platform", | |
a0245f7a | 969 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 970 | .match = platform_match, |
a0245f7a | 971 | .uevent = platform_uevent, |
25e18499 | 972 | .pm = PLATFORM_PM_OPS_PTR, |
1da177e4 | 973 | }; |
a96b2042 | 974 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
975 | |
976 | int __init platform_bus_init(void) | |
977 | { | |
fbfb1445 CH |
978 | int error; |
979 | ||
13977091 MD |
980 | early_platform_cleanup(); |
981 | ||
fbfb1445 CH |
982 | error = device_register(&platform_bus); |
983 | if (error) | |
984 | return error; | |
985 | error = bus_register(&platform_bus_type); | |
986 | if (error) | |
987 | device_unregister(&platform_bus); | |
988 | return error; | |
1da177e4 LT |
989 | } |
990 | ||
991 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
992 | u64 dma_get_required_mask(struct device *dev) | |
993 | { | |
994 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
995 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
996 | u64 mask; | |
997 | ||
998 | if (!high_totalram) { | |
999 | /* convert to mask just covering totalram */ | |
1000 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
1001 | low_totalram += low_totalram - 1; | |
1002 | mask = low_totalram; | |
1003 | } else { | |
1004 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
1005 | high_totalram += high_totalram - 1; | |
1006 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
1007 | } | |
e88a0c2c | 1008 | return mask; |
1da177e4 LT |
1009 | } |
1010 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
1011 | #endif | |
13977091 MD |
1012 | |
1013 | static __initdata LIST_HEAD(early_platform_driver_list); | |
1014 | static __initdata LIST_HEAD(early_platform_device_list); | |
1015 | ||
1016 | /** | |
1017 | * early_platform_driver_register | |
d86c1302 | 1018 | * @epdrv: early_platform driver structure |
13977091 MD |
1019 | * @buf: string passed from early_param() |
1020 | */ | |
1021 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
1022 | char *buf) | |
1023 | { | |
1024 | unsigned long index; | |
1025 | int n; | |
1026 | ||
1027 | /* Simply add the driver to the end of the global list. | |
1028 | * Drivers will by default be put on the list in compiled-in order. | |
1029 | */ | |
1030 | if (!epdrv->list.next) { | |
1031 | INIT_LIST_HEAD(&epdrv->list); | |
1032 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
1033 | } | |
1034 | ||
1035 | /* If the user has specified device then make sure the driver | |
1036 | * gets prioritized. The driver of the last device specified on | |
1037 | * command line will be put first on the list. | |
1038 | */ | |
1039 | n = strlen(epdrv->pdrv->driver.name); | |
1040 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
1041 | list_move(&epdrv->list, &early_platform_driver_list); | |
1042 | ||
1043 | if (!strcmp(buf, epdrv->pdrv->driver.name)) | |
1044 | epdrv->requested_id = -1; | |
1045 | else if (buf[n] == '.' && strict_strtoul(&buf[n + 1], 10, | |
1046 | &index) == 0) | |
1047 | epdrv->requested_id = index; | |
1048 | else | |
1049 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
1050 | } | |
1051 | ||
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | /** | |
1056 | * early_platform_add_devices - add a numbers of early platform devices | |
1057 | * @devs: array of early platform devices to add | |
1058 | * @num: number of early platform devices in array | |
1059 | */ | |
1060 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1061 | { | |
1062 | struct device *dev; | |
1063 | int i; | |
1064 | ||
1065 | /* simply add the devices to list */ | |
1066 | for (i = 0; i < num; i++) { | |
1067 | dev = &devs[i]->dev; | |
1068 | ||
1069 | if (!dev->devres_head.next) { | |
1070 | INIT_LIST_HEAD(&dev->devres_head); | |
1071 | list_add_tail(&dev->devres_head, | |
1072 | &early_platform_device_list); | |
1073 | } | |
1074 | } | |
1075 | } | |
1076 | ||
1077 | /** | |
1078 | * early_platform_driver_register_all | |
1079 | * @class_str: string to identify early platform driver class | |
1080 | */ | |
1081 | void __init early_platform_driver_register_all(char *class_str) | |
1082 | { | |
1083 | /* The "class_str" parameter may or may not be present on the kernel | |
1084 | * command line. If it is present then there may be more than one | |
1085 | * matching parameter. | |
1086 | * | |
1087 | * Since we register our early platform drivers using early_param() | |
1088 | * we need to make sure that they also get registered in the case | |
1089 | * when the parameter is missing from the kernel command line. | |
1090 | * | |
1091 | * We use parse_early_options() to make sure the early_param() gets | |
1092 | * called at least once. The early_param() may be called more than | |
1093 | * once since the name of the preferred device may be specified on | |
1094 | * the kernel command line. early_platform_driver_register() handles | |
1095 | * this case for us. | |
1096 | */ | |
1097 | parse_early_options(class_str); | |
1098 | } | |
1099 | ||
1100 | /** | |
1101 | * early_platform_match | |
d86c1302 | 1102 | * @epdrv: early platform driver structure |
13977091 MD |
1103 | * @id: id to match against |
1104 | */ | |
1105 | static __init struct platform_device * | |
1106 | early_platform_match(struct early_platform_driver *epdrv, int id) | |
1107 | { | |
1108 | struct platform_device *pd; | |
1109 | ||
1110 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1111 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1112 | if (pd->id == id) | |
1113 | return pd; | |
1114 | ||
1115 | return NULL; | |
1116 | } | |
1117 | ||
1118 | /** | |
1119 | * early_platform_left | |
d86c1302 | 1120 | * @epdrv: early platform driver structure |
13977091 MD |
1121 | * @id: return true if id or above exists |
1122 | */ | |
1123 | static __init int early_platform_left(struct early_platform_driver *epdrv, | |
1124 | int id) | |
1125 | { | |
1126 | struct platform_device *pd; | |
1127 | ||
1128 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1129 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1130 | if (pd->id >= id) | |
1131 | return 1; | |
1132 | ||
1133 | return 0; | |
1134 | } | |
1135 | ||
1136 | /** | |
1137 | * early_platform_driver_probe_id | |
1138 | * @class_str: string to identify early platform driver class | |
1139 | * @id: id to match against | |
1140 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1141 | */ | |
1142 | static int __init early_platform_driver_probe_id(char *class_str, | |
1143 | int id, | |
1144 | int nr_probe) | |
1145 | { | |
1146 | struct early_platform_driver *epdrv; | |
1147 | struct platform_device *match; | |
1148 | int match_id; | |
1149 | int n = 0; | |
1150 | int left = 0; | |
1151 | ||
1152 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1153 | /* only use drivers matching our class_str */ | |
1154 | if (strcmp(class_str, epdrv->class_str)) | |
1155 | continue; | |
1156 | ||
1157 | if (id == -2) { | |
1158 | match_id = epdrv->requested_id; | |
1159 | left = 1; | |
1160 | ||
1161 | } else { | |
1162 | match_id = id; | |
1163 | left += early_platform_left(epdrv, id); | |
1164 | ||
1165 | /* skip requested id */ | |
1166 | switch (epdrv->requested_id) { | |
1167 | case EARLY_PLATFORM_ID_ERROR: | |
1168 | case EARLY_PLATFORM_ID_UNSET: | |
1169 | break; | |
1170 | default: | |
1171 | if (epdrv->requested_id == id) | |
1172 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1173 | } | |
1174 | } | |
1175 | ||
1176 | switch (match_id) { | |
1177 | case EARLY_PLATFORM_ID_ERROR: | |
1178 | pr_warning("%s: unable to parse %s parameter\n", | |
1179 | class_str, epdrv->pdrv->driver.name); | |
1180 | /* fall-through */ | |
1181 | case EARLY_PLATFORM_ID_UNSET: | |
1182 | match = NULL; | |
1183 | break; | |
1184 | default: | |
1185 | match = early_platform_match(epdrv, match_id); | |
1186 | } | |
1187 | ||
1188 | if (match) { | |
1189 | if (epdrv->pdrv->probe(match)) | |
1190 | pr_warning("%s: unable to probe %s early.\n", | |
1191 | class_str, match->name); | |
1192 | else | |
1193 | n++; | |
1194 | } | |
1195 | ||
1196 | if (n >= nr_probe) | |
1197 | break; | |
1198 | } | |
1199 | ||
1200 | if (left) | |
1201 | return n; | |
1202 | else | |
1203 | return -ENODEV; | |
1204 | } | |
1205 | ||
1206 | /** | |
1207 | * early_platform_driver_probe | |
1208 | * @class_str: string to identify early platform driver class | |
1209 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1210 | * @user_only: only probe user specified early platform devices | |
1211 | */ | |
1212 | int __init early_platform_driver_probe(char *class_str, | |
1213 | int nr_probe, | |
1214 | int user_only) | |
1215 | { | |
1216 | int k, n, i; | |
1217 | ||
1218 | n = 0; | |
1219 | for (i = -2; n < nr_probe; i++) { | |
1220 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1221 | ||
1222 | if (k < 0) | |
1223 | break; | |
1224 | ||
1225 | n += k; | |
1226 | ||
1227 | if (user_only) | |
1228 | break; | |
1229 | } | |
1230 | ||
1231 | return n; | |
1232 | } | |
1233 | ||
1234 | /** | |
1235 | * early_platform_cleanup - clean up early platform code | |
1236 | */ | |
1237 | void __init early_platform_cleanup(void) | |
1238 | { | |
1239 | struct platform_device *pd, *pd2; | |
1240 | ||
1241 | /* clean up the devres list used to chain devices */ | |
1242 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1243 | dev.devres_head) { | |
1244 | list_del(&pd->dev.devres_head); | |
1245 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1246 | } | |
1247 | } | |
1248 |