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 | ||
daa41226 | 13 | #include <linux/string.h> |
d052d1be | 14 | #include <linux/platform_device.h> |
05212157 | 15 | #include <linux/of_device.h> |
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <linux/init.h> | |
18 | #include <linux/dma-mapping.h> | |
19 | #include <linux/bootmem.h> | |
20 | #include <linux/err.h> | |
4e57b681 | 21 | #include <linux/slab.h> |
9d730229 | 22 | #include <linux/pm_runtime.h> |
1da177e4 | 23 | |
a1bdc7aa BD |
24 | #include "base.h" |
25 | ||
4a3ad20c GKH |
26 | #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \ |
27 | driver)) | |
00d3dcdd | 28 | |
1da177e4 | 29 | struct device platform_bus = { |
1e0b2cf9 | 30 | .init_name = "platform", |
1da177e4 | 31 | }; |
a96b2042 | 32 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 | 33 | |
a77ce816 KG |
34 | /** |
35 | * arch_setup_pdev_archdata - Allow manipulation of archdata before its used | |
7de636fa | 36 | * @pdev: platform device |
a77ce816 KG |
37 | * |
38 | * This is called before platform_device_add() such that any pdev_archdata may | |
39 | * be setup before the platform_notifier is called. So if a user needs to | |
40 | * manipulate any relevant information in the pdev_archdata they can do: | |
41 | * | |
42 | * platform_devic_alloc() | |
43 | * ... manipulate ... | |
44 | * platform_device_add() | |
45 | * | |
46 | * And if they don't care they can just call platform_device_register() and | |
47 | * everything will just work out. | |
48 | */ | |
49 | void __weak arch_setup_pdev_archdata(struct platform_device *pdev) | |
50 | { | |
51 | } | |
52 | ||
1da177e4 | 53 | /** |
4a3ad20c GKH |
54 | * platform_get_resource - get a resource for a device |
55 | * @dev: platform device | |
56 | * @type: resource type | |
57 | * @num: resource index | |
1da177e4 | 58 | */ |
4a3ad20c GKH |
59 | struct resource *platform_get_resource(struct platform_device *dev, |
60 | unsigned int type, unsigned int num) | |
1da177e4 LT |
61 | { |
62 | int i; | |
63 | ||
64 | for (i = 0; i < dev->num_resources; i++) { | |
65 | struct resource *r = &dev->resource[i]; | |
66 | ||
c9f66169 MD |
67 | if (type == resource_type(r) && num-- == 0) |
68 | return r; | |
1da177e4 LT |
69 | } |
70 | return NULL; | |
71 | } | |
a96b2042 | 72 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
73 | |
74 | /** | |
4a3ad20c GKH |
75 | * platform_get_irq - get an IRQ for a device |
76 | * @dev: platform device | |
77 | * @num: IRQ number index | |
1da177e4 LT |
78 | */ |
79 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
80 | { | |
81 | struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
82 | ||
305b3228 | 83 | return r ? r->start : -ENXIO; |
1da177e4 | 84 | } |
a96b2042 | 85 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
86 | |
87 | /** | |
4a3ad20c GKH |
88 | * platform_get_resource_byname - get a resource for a device by name |
89 | * @dev: platform device | |
90 | * @type: resource type | |
91 | * @name: resource name | |
1da177e4 | 92 | */ |
4a3ad20c | 93 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
94 | unsigned int type, |
95 | const char *name) | |
1da177e4 LT |
96 | { |
97 | int i; | |
98 | ||
99 | for (i = 0; i < dev->num_resources; i++) { | |
100 | struct resource *r = &dev->resource[i]; | |
101 | ||
c9f66169 MD |
102 | if (type == resource_type(r) && !strcmp(r->name, name)) |
103 | return r; | |
1da177e4 LT |
104 | } |
105 | return NULL; | |
106 | } | |
a96b2042 | 107 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
108 | |
109 | /** | |
4a3ad20c GKH |
110 | * platform_get_irq - get an IRQ for a device |
111 | * @dev: platform device | |
112 | * @name: IRQ name | |
1da177e4 | 113 | */ |
c0afe7ba | 114 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
1da177e4 | 115 | { |
4a3ad20c GKH |
116 | struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, |
117 | name); | |
1da177e4 | 118 | |
305b3228 | 119 | return r ? r->start : -ENXIO; |
1da177e4 | 120 | } |
a96b2042 | 121 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
122 | |
123 | /** | |
4a3ad20c GKH |
124 | * platform_add_devices - add a numbers of platform devices |
125 | * @devs: array of platform devices to add | |
126 | * @num: number of platform devices in array | |
1da177e4 LT |
127 | */ |
128 | int platform_add_devices(struct platform_device **devs, int num) | |
129 | { | |
130 | int i, ret = 0; | |
131 | ||
132 | for (i = 0; i < num; i++) { | |
133 | ret = platform_device_register(devs[i]); | |
134 | if (ret) { | |
135 | while (--i >= 0) | |
136 | platform_device_unregister(devs[i]); | |
137 | break; | |
138 | } | |
139 | } | |
140 | ||
141 | return ret; | |
142 | } | |
a96b2042 | 143 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 144 | |
37c12e74 RK |
145 | struct platform_object { |
146 | struct platform_device pdev; | |
147 | char name[1]; | |
148 | }; | |
149 | ||
1da177e4 | 150 | /** |
3c31f07a | 151 | * platform_device_put - destroy a platform device |
4a3ad20c | 152 | * @pdev: platform device to free |
37c12e74 | 153 | * |
4a3ad20c GKH |
154 | * Free all memory associated with a platform device. This function must |
155 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
156 | */ |
157 | void platform_device_put(struct platform_device *pdev) | |
158 | { | |
159 | if (pdev) | |
160 | put_device(&pdev->dev); | |
161 | } | |
162 | EXPORT_SYMBOL_GPL(platform_device_put); | |
163 | ||
164 | static void platform_device_release(struct device *dev) | |
165 | { | |
4a3ad20c GKH |
166 | struct platform_object *pa = container_of(dev, struct platform_object, |
167 | pdev.dev); | |
37c12e74 | 168 | |
7096d042 | 169 | of_device_node_put(&pa->pdev.dev); |
37c12e74 | 170 | kfree(pa->pdev.dev.platform_data); |
e710d7d5 | 171 | kfree(pa->pdev.mfd_cell); |
37c12e74 RK |
172 | kfree(pa->pdev.resource); |
173 | kfree(pa); | |
174 | } | |
175 | ||
176 | /** | |
3c31f07a | 177 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
178 | * @name: base name of the device we're adding |
179 | * @id: instance id | |
37c12e74 | 180 | * |
4a3ad20c GKH |
181 | * Create a platform device object which can have other objects attached |
182 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 183 | */ |
1359555e | 184 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
185 | { |
186 | struct platform_object *pa; | |
187 | ||
188 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); | |
189 | if (pa) { | |
190 | strcpy(pa->name, name); | |
191 | pa->pdev.name = pa->name; | |
192 | pa->pdev.id = id; | |
193 | device_initialize(&pa->pdev.dev); | |
194 | pa->pdev.dev.release = platform_device_release; | |
a77ce816 | 195 | arch_setup_pdev_archdata(&pa->pdev); |
37c12e74 RK |
196 | } |
197 | ||
93ce3061 | 198 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
199 | } |
200 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
201 | ||
202 | /** | |
3c31f07a | 203 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
204 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
205 | * @res: set of resources that needs to be allocated for the device | |
206 | * @num: number of resources | |
37c12e74 | 207 | * |
4a3ad20c GKH |
208 | * Add a copy of the resources to the platform device. The memory |
209 | * associated with the resources will be freed when the platform device is | |
210 | * released. | |
37c12e74 | 211 | */ |
4a3ad20c | 212 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 213 | const struct resource *res, unsigned int num) |
37c12e74 | 214 | { |
cea89623 | 215 | struct resource *r = NULL; |
37c12e74 | 216 | |
cea89623 UKK |
217 | if (res) { |
218 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); | |
219 | if (!r) | |
220 | return -ENOMEM; | |
37c12e74 | 221 | } |
cea89623 | 222 | |
4a03d6f7 | 223 | kfree(pdev->resource); |
cea89623 UKK |
224 | pdev->resource = r; |
225 | pdev->num_resources = num; | |
226 | return 0; | |
37c12e74 RK |
227 | } |
228 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
229 | ||
230 | /** | |
3c31f07a | 231 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
232 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
233 | * @data: platform specific data for this platform device | |
234 | * @size: size of platform specific data | |
37c12e74 | 235 | * |
4a3ad20c GKH |
236 | * Add a copy of platform specific data to the platform device's |
237 | * platform_data pointer. The memory associated with the platform data | |
238 | * will be freed when the platform device is released. | |
37c12e74 | 239 | */ |
4a3ad20c GKH |
240 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
241 | size_t size) | |
37c12e74 | 242 | { |
27a33f9e | 243 | void *d = NULL; |
5cfc64ce | 244 | |
27a33f9e UKK |
245 | if (data) { |
246 | d = kmemdup(data, size, GFP_KERNEL); | |
247 | if (!d) | |
248 | return -ENOMEM; | |
37c12e74 | 249 | } |
27a33f9e | 250 | |
251e031d | 251 | kfree(pdev->dev.platform_data); |
27a33f9e UKK |
252 | pdev->dev.platform_data = d; |
253 | return 0; | |
37c12e74 RK |
254 | } |
255 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
256 | ||
257 | /** | |
4a3ad20c GKH |
258 | * platform_device_add - add a platform device to device hierarchy |
259 | * @pdev: platform device we're adding | |
1da177e4 | 260 | * |
4a3ad20c GKH |
261 | * This is part 2 of platform_device_register(), though may be called |
262 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 263 | */ |
37c12e74 | 264 | int platform_device_add(struct platform_device *pdev) |
1da177e4 LT |
265 | { |
266 | int i, ret = 0; | |
267 | ||
268 | if (!pdev) | |
269 | return -EINVAL; | |
270 | ||
271 | if (!pdev->dev.parent) | |
272 | pdev->dev.parent = &platform_bus; | |
273 | ||
274 | pdev->dev.bus = &platform_bus_type; | |
275 | ||
276 | if (pdev->id != -1) | |
1e0b2cf9 | 277 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
1da177e4 | 278 | else |
acc0e90f | 279 | dev_set_name(&pdev->dev, "%s", pdev->name); |
1da177e4 LT |
280 | |
281 | for (i = 0; i < pdev->num_resources; i++) { | |
282 | struct resource *p, *r = &pdev->resource[i]; | |
283 | ||
284 | if (r->name == NULL) | |
1e0b2cf9 | 285 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
286 | |
287 | p = r->parent; | |
288 | if (!p) { | |
c9f66169 | 289 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 290 | p = &iomem_resource; |
c9f66169 | 291 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
292 | p = &ioport_resource; |
293 | } | |
294 | ||
d960bb4d | 295 | if (p && insert_resource(p, r)) { |
1da177e4 LT |
296 | printk(KERN_ERR |
297 | "%s: failed to claim resource %d\n", | |
1e0b2cf9 | 298 | dev_name(&pdev->dev), i); |
1da177e4 LT |
299 | ret = -EBUSY; |
300 | goto failed; | |
301 | } | |
302 | } | |
303 | ||
304 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 305 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 306 | |
e3915532 | 307 | ret = device_add(&pdev->dev); |
1da177e4 LT |
308 | if (ret == 0) |
309 | return ret; | |
310 | ||
311 | failed: | |
c9f66169 MD |
312 | while (--i >= 0) { |
313 | struct resource *r = &pdev->resource[i]; | |
314 | unsigned long type = resource_type(r); | |
315 | ||
316 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
317 | release_resource(r); | |
318 | } | |
319 | ||
1da177e4 LT |
320 | return ret; |
321 | } | |
37c12e74 RK |
322 | EXPORT_SYMBOL_GPL(platform_device_add); |
323 | ||
324 | /** | |
4a3ad20c GKH |
325 | * platform_device_del - remove a platform-level device |
326 | * @pdev: platform device we're removing | |
1da177e4 | 327 | * |
4a3ad20c GKH |
328 | * Note that this function will also release all memory- and port-based |
329 | * resources owned by the device (@dev->resource). This function must | |
330 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 331 | */ |
93ce3061 | 332 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
333 | { |
334 | int i; | |
335 | ||
336 | if (pdev) { | |
dc4c15d4 JD |
337 | device_del(&pdev->dev); |
338 | ||
1da177e4 LT |
339 | for (i = 0; i < pdev->num_resources; i++) { |
340 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
341 | unsigned long type = resource_type(r); |
342 | ||
343 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
344 | release_resource(r); |
345 | } | |
1da177e4 LT |
346 | } |
347 | } | |
93ce3061 DT |
348 | EXPORT_SYMBOL_GPL(platform_device_del); |
349 | ||
350 | /** | |
4a3ad20c GKH |
351 | * platform_device_register - add a platform-level device |
352 | * @pdev: platform device we're adding | |
93ce3061 | 353 | */ |
4a3ad20c | 354 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
355 | { |
356 | device_initialize(&pdev->dev); | |
a77ce816 | 357 | arch_setup_pdev_archdata(pdev); |
93ce3061 DT |
358 | return platform_device_add(pdev); |
359 | } | |
a96b2042 | 360 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
361 | |
362 | /** | |
4a3ad20c GKH |
363 | * platform_device_unregister - unregister a platform-level device |
364 | * @pdev: platform device we're unregistering | |
93ce3061 | 365 | * |
4a3ad20c GKH |
366 | * Unregistration is done in 2 steps. First we release all resources |
367 | * and remove it from the subsystem, then we drop reference count by | |
368 | * calling platform_device_put(). | |
93ce3061 | 369 | */ |
4a3ad20c | 370 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
371 | { |
372 | platform_device_del(pdev); | |
373 | platform_device_put(pdev); | |
374 | } | |
a96b2042 | 375 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 376 | |
1da177e4 | 377 | /** |
01dcc60a | 378 | * platform_device_register_full - add a platform-level device with |
44f28bde | 379 | * resources and platform-specific data |
49a4ec18 | 380 | * |
01dcc60a | 381 | * @pdevinfo: data used to create device |
d8bf2540 | 382 | * |
f0eae0ed | 383 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 384 | */ |
01dcc60a | 385 | struct platform_device *platform_device_register_full( |
5a3072be | 386 | const struct platform_device_info *pdevinfo) |
d8bf2540 | 387 | { |
44f28bde | 388 | int ret = -ENOMEM; |
d8bf2540 | 389 | struct platform_device *pdev; |
d8bf2540 | 390 | |
01dcc60a | 391 | pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
44f28bde | 392 | if (!pdev) |
01dcc60a UKK |
393 | goto err_alloc; |
394 | ||
395 | pdev->dev.parent = pdevinfo->parent; | |
396 | ||
397 | if (pdevinfo->dma_mask) { | |
398 | /* | |
399 | * This memory isn't freed when the device is put, | |
400 | * I don't have a nice idea for that though. Conceptually | |
401 | * dma_mask in struct device should not be a pointer. | |
402 | * See http://thread.gmane.org/gmane.linux.kernel.pci/9081 | |
403 | */ | |
404 | pdev->dev.dma_mask = | |
405 | kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); | |
406 | if (!pdev->dev.dma_mask) | |
407 | goto err; | |
408 | ||
409 | *pdev->dev.dma_mask = pdevinfo->dma_mask; | |
410 | pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; | |
411 | } | |
d8bf2540 | 412 | |
01dcc60a UKK |
413 | ret = platform_device_add_resources(pdev, |
414 | pdevinfo->res, pdevinfo->num_res); | |
807508c8 AV |
415 | if (ret) |
416 | goto err; | |
44f28bde | 417 | |
01dcc60a UKK |
418 | ret = platform_device_add_data(pdev, |
419 | pdevinfo->data, pdevinfo->size_data); | |
807508c8 AV |
420 | if (ret) |
421 | goto err; | |
d8bf2540 | 422 | |
44f28bde UKK |
423 | ret = platform_device_add(pdev); |
424 | if (ret) { | |
425 | err: | |
01dcc60a UKK |
426 | kfree(pdev->dev.dma_mask); |
427 | ||
428 | err_alloc: | |
44f28bde UKK |
429 | platform_device_put(pdev); |
430 | return ERR_PTR(ret); | |
431 | } | |
d8bf2540 DB |
432 | |
433 | return pdev; | |
d8bf2540 | 434 | } |
01dcc60a | 435 | EXPORT_SYMBOL_GPL(platform_device_register_full); |
d8bf2540 | 436 | |
00d3dcdd RK |
437 | static int platform_drv_probe(struct device *_dev) |
438 | { | |
439 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
440 | struct platform_device *dev = to_platform_device(_dev); | |
441 | ||
442 | return drv->probe(dev); | |
443 | } | |
444 | ||
c67334fb DB |
445 | static int platform_drv_probe_fail(struct device *_dev) |
446 | { | |
447 | return -ENXIO; | |
448 | } | |
449 | ||
00d3dcdd RK |
450 | static int platform_drv_remove(struct device *_dev) |
451 | { | |
452 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
453 | struct platform_device *dev = to_platform_device(_dev); | |
454 | ||
455 | return drv->remove(dev); | |
456 | } | |
457 | ||
458 | static void platform_drv_shutdown(struct device *_dev) | |
459 | { | |
460 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
461 | struct platform_device *dev = to_platform_device(_dev); | |
462 | ||
463 | drv->shutdown(dev); | |
464 | } | |
465 | ||
00d3dcdd | 466 | /** |
3c31f07a | 467 | * platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 468 | * @drv: platform driver structure |
00d3dcdd RK |
469 | */ |
470 | int platform_driver_register(struct platform_driver *drv) | |
471 | { | |
472 | drv->driver.bus = &platform_bus_type; | |
473 | if (drv->probe) | |
474 | drv->driver.probe = platform_drv_probe; | |
475 | if (drv->remove) | |
476 | drv->driver.remove = platform_drv_remove; | |
477 | if (drv->shutdown) | |
478 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 479 | |
00d3dcdd RK |
480 | return driver_register(&drv->driver); |
481 | } | |
482 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
483 | ||
484 | /** | |
3c31f07a | 485 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 486 | * @drv: platform driver structure |
00d3dcdd RK |
487 | */ |
488 | void platform_driver_unregister(struct platform_driver *drv) | |
489 | { | |
490 | driver_unregister(&drv->driver); | |
491 | } | |
492 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
493 | ||
c67334fb DB |
494 | /** |
495 | * platform_driver_probe - register driver for non-hotpluggable device | |
496 | * @drv: platform driver structure | |
497 | * @probe: the driver probe routine, probably from an __init section | |
498 | * | |
499 | * Use this instead of platform_driver_register() when you know the device | |
500 | * is not hotpluggable and has already been registered, and you want to | |
501 | * remove its run-once probe() infrastructure from memory after the driver | |
502 | * has bound to the device. | |
503 | * | |
504 | * One typical use for this would be with drivers for controllers integrated | |
505 | * into system-on-chip processors, where the controller devices have been | |
506 | * configured as part of board setup. | |
507 | * | |
508 | * Returns zero if the driver registered and bound to a device, else returns | |
509 | * a negative error code and with the driver not registered. | |
510 | */ | |
c63e0783 | 511 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
512 | int (*probe)(struct platform_device *)) |
513 | { | |
514 | int retval, code; | |
515 | ||
1a6f2a75 DT |
516 | /* make sure driver won't have bind/unbind attributes */ |
517 | drv->driver.suppress_bind_attrs = true; | |
518 | ||
c67334fb DB |
519 | /* temporary section violation during probe() */ |
520 | drv->probe = probe; | |
521 | retval = code = platform_driver_register(drv); | |
522 | ||
1a6f2a75 DT |
523 | /* |
524 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
525 | * the list of drivers in order to probe new devices. Check to see |
526 | * if the probe was successful, and make sure any forced probes of | |
527 | * new devices fail. | |
528 | */ | |
d79d3244 | 529 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb | 530 | drv->probe = NULL; |
e5dd1278 | 531 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
532 | retval = -ENODEV; |
533 | drv->driver.probe = platform_drv_probe_fail; | |
d79d3244 | 534 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
535 | |
536 | if (code != retval) | |
537 | platform_driver_unregister(drv); | |
538 | return retval; | |
539 | } | |
540 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 541 | |
ecdf6ceb DT |
542 | /** |
543 | * platform_create_bundle - register driver and create corresponding device | |
544 | * @driver: platform driver structure | |
545 | * @probe: the driver probe routine, probably from an __init section | |
546 | * @res: set of resources that needs to be allocated for the device | |
547 | * @n_res: number of resources | |
548 | * @data: platform specific data for this platform device | |
549 | * @size: size of platform specific data | |
550 | * | |
551 | * Use this in legacy-style modules that probe hardware directly and | |
552 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
553 | * |
554 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb DT |
555 | */ |
556 | struct platform_device * __init_or_module platform_create_bundle( | |
557 | struct platform_driver *driver, | |
558 | int (*probe)(struct platform_device *), | |
559 | struct resource *res, unsigned int n_res, | |
560 | const void *data, size_t size) | |
561 | { | |
562 | struct platform_device *pdev; | |
563 | int error; | |
564 | ||
565 | pdev = platform_device_alloc(driver->driver.name, -1); | |
566 | if (!pdev) { | |
567 | error = -ENOMEM; | |
568 | goto err_out; | |
569 | } | |
570 | ||
807508c8 AV |
571 | error = platform_device_add_resources(pdev, res, n_res); |
572 | if (error) | |
573 | goto err_pdev_put; | |
ecdf6ceb | 574 | |
807508c8 AV |
575 | error = platform_device_add_data(pdev, data, size); |
576 | if (error) | |
577 | goto err_pdev_put; | |
ecdf6ceb DT |
578 | |
579 | error = platform_device_add(pdev); | |
580 | if (error) | |
581 | goto err_pdev_put; | |
582 | ||
583 | error = platform_driver_probe(driver, probe); | |
584 | if (error) | |
585 | goto err_pdev_del; | |
586 | ||
587 | return pdev; | |
588 | ||
589 | err_pdev_del: | |
590 | platform_device_del(pdev); | |
591 | err_pdev_put: | |
592 | platform_device_put(pdev); | |
593 | err_out: | |
594 | return ERR_PTR(error); | |
595 | } | |
596 | EXPORT_SYMBOL_GPL(platform_create_bundle); | |
597 | ||
a0245f7a DB |
598 | /* modalias support enables more hands-off userspace setup: |
599 | * (a) environment variable lets new-style hotplug events work once system is | |
600 | * fully running: "modprobe $MODALIAS" | |
601 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
602 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
603 | */ | |
4a3ad20c GKH |
604 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
605 | char *buf) | |
a0245f7a DB |
606 | { |
607 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 608 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
609 | |
610 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
611 | } | |
612 | ||
613 | static struct device_attribute platform_dev_attrs[] = { | |
614 | __ATTR_RO(modalias), | |
615 | __ATTR_NULL, | |
616 | }; | |
617 | ||
7eff2e7a | 618 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
619 | { |
620 | struct platform_device *pdev = to_platform_device(dev); | |
eca39301 GL |
621 | int rc; |
622 | ||
623 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
07d57a32 | 624 | rc = of_device_uevent_modalias(dev,env); |
eca39301 GL |
625 | if (rc != -ENODEV) |
626 | return rc; | |
a0245f7a | 627 | |
57fee4a5 | 628 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
0a26813c | 629 | pdev->name); |
a0245f7a DB |
630 | return 0; |
631 | } | |
632 | ||
57fee4a5 | 633 | static const struct platform_device_id *platform_match_id( |
831fad2f | 634 | const struct platform_device_id *id, |
57fee4a5 EM |
635 | struct platform_device *pdev) |
636 | { | |
637 | while (id->name[0]) { | |
638 | if (strcmp(pdev->name, id->name) == 0) { | |
639 | pdev->id_entry = id; | |
640 | return id; | |
641 | } | |
642 | id++; | |
643 | } | |
644 | return NULL; | |
645 | } | |
646 | ||
1da177e4 | 647 | /** |
4a3ad20c GKH |
648 | * platform_match - bind platform device to platform driver. |
649 | * @dev: device. | |
650 | * @drv: driver. | |
1da177e4 | 651 | * |
4a3ad20c GKH |
652 | * Platform device IDs are assumed to be encoded like this: |
653 | * "<name><instance>", where <name> is a short description of the type of | |
654 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
655 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
656 | * "<name>". So, extract the <name> from the platform_device structure, | |
657 | * and compare it against the name of the driver. Return whether they match | |
658 | * or not. | |
1da177e4 | 659 | */ |
4a3ad20c | 660 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 661 | { |
71b3e0c1 | 662 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
663 | struct platform_driver *pdrv = to_platform_driver(drv); |
664 | ||
05212157 GL |
665 | /* Attempt an OF style match first */ |
666 | if (of_driver_match_device(dev, drv)) | |
667 | return 1; | |
668 | ||
669 | /* Then try to match against the id table */ | |
57fee4a5 EM |
670 | if (pdrv->id_table) |
671 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 672 | |
57fee4a5 | 673 | /* fall-back to driver name match */ |
1e0b2cf9 | 674 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
675 | } |
676 | ||
25e18499 RW |
677 | #ifdef CONFIG_PM_SLEEP |
678 | ||
679 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 680 | { |
783ea7d4 MD |
681 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
682 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
683 | int ret = 0; |
684 | ||
783ea7d4 MD |
685 | if (dev->driver && pdrv->suspend) |
686 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
687 | |
688 | return ret; | |
689 | } | |
690 | ||
25e18499 | 691 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 692 | { |
783ea7d4 MD |
693 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
694 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
695 | int ret = 0; |
696 | ||
783ea7d4 MD |
697 | if (dev->driver && pdrv->resume) |
698 | ret = pdrv->resume(pdev); | |
9480e307 | 699 | |
1da177e4 LT |
700 | return ret; |
701 | } | |
702 | ||
69c9dd1e | 703 | #endif /* CONFIG_PM_SLEEP */ |
9d730229 | 704 | |
25e18499 RW |
705 | #ifdef CONFIG_SUSPEND |
706 | ||
69c9dd1e | 707 | int platform_pm_suspend(struct device *dev) |
25e18499 RW |
708 | { |
709 | struct device_driver *drv = dev->driver; | |
710 | int ret = 0; | |
711 | ||
adf09493 RW |
712 | if (!drv) |
713 | return 0; | |
714 | ||
715 | if (drv->pm) { | |
25e18499 RW |
716 | if (drv->pm->suspend) |
717 | ret = drv->pm->suspend(dev); | |
718 | } else { | |
719 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
720 | } | |
721 | ||
722 | return ret; | |
723 | } | |
724 | ||
69c9dd1e | 725 | int platform_pm_resume(struct device *dev) |
25e18499 RW |
726 | { |
727 | struct device_driver *drv = dev->driver; | |
728 | int ret = 0; | |
729 | ||
adf09493 RW |
730 | if (!drv) |
731 | return 0; | |
732 | ||
733 | if (drv->pm) { | |
25e18499 RW |
734 | if (drv->pm->resume) |
735 | ret = drv->pm->resume(dev); | |
736 | } else { | |
737 | ret = platform_legacy_resume(dev); | |
738 | } | |
739 | ||
740 | return ret; | |
741 | } | |
742 | ||
69c9dd1e | 743 | #endif /* CONFIG_SUSPEND */ |
25e18499 | 744 | |
1f112cee | 745 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 | 746 | |
69c9dd1e | 747 | int platform_pm_freeze(struct device *dev) |
25e18499 RW |
748 | { |
749 | struct device_driver *drv = dev->driver; | |
750 | int ret = 0; | |
751 | ||
752 | if (!drv) | |
753 | return 0; | |
754 | ||
755 | if (drv->pm) { | |
756 | if (drv->pm->freeze) | |
757 | ret = drv->pm->freeze(dev); | |
758 | } else { | |
759 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
760 | } | |
761 | ||
762 | return ret; | |
763 | } | |
764 | ||
69c9dd1e | 765 | int platform_pm_thaw(struct device *dev) |
25e18499 RW |
766 | { |
767 | struct device_driver *drv = dev->driver; | |
768 | int ret = 0; | |
769 | ||
adf09493 RW |
770 | if (!drv) |
771 | return 0; | |
772 | ||
773 | if (drv->pm) { | |
25e18499 RW |
774 | if (drv->pm->thaw) |
775 | ret = drv->pm->thaw(dev); | |
776 | } else { | |
777 | ret = platform_legacy_resume(dev); | |
778 | } | |
779 | ||
780 | return ret; | |
781 | } | |
782 | ||
69c9dd1e | 783 | int platform_pm_poweroff(struct device *dev) |
25e18499 RW |
784 | { |
785 | struct device_driver *drv = dev->driver; | |
786 | int ret = 0; | |
787 | ||
adf09493 RW |
788 | if (!drv) |
789 | return 0; | |
790 | ||
791 | if (drv->pm) { | |
25e18499 RW |
792 | if (drv->pm->poweroff) |
793 | ret = drv->pm->poweroff(dev); | |
794 | } else { | |
795 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
796 | } | |
797 | ||
798 | return ret; | |
799 | } | |
800 | ||
69c9dd1e | 801 | int platform_pm_restore(struct device *dev) |
25e18499 RW |
802 | { |
803 | struct device_driver *drv = dev->driver; | |
804 | int ret = 0; | |
805 | ||
adf09493 RW |
806 | if (!drv) |
807 | return 0; | |
808 | ||
809 | if (drv->pm) { | |
25e18499 RW |
810 | if (drv->pm->restore) |
811 | ret = drv->pm->restore(dev); | |
812 | } else { | |
813 | ret = platform_legacy_resume(dev); | |
814 | } | |
815 | ||
816 | return ret; | |
817 | } | |
818 | ||
69c9dd1e | 819 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 820 | |
d9ab7716 | 821 | static const struct dev_pm_ops platform_dev_pm_ops = { |
8b313a38 RW |
822 | .runtime_suspend = pm_generic_runtime_suspend, |
823 | .runtime_resume = pm_generic_runtime_resume, | |
824 | .runtime_idle = pm_generic_runtime_idle, | |
69c9dd1e | 825 | USE_PLATFORM_PM_SLEEP_OPS |
25e18499 RW |
826 | }; |
827 | ||
1da177e4 LT |
828 | struct bus_type platform_bus_type = { |
829 | .name = "platform", | |
a0245f7a | 830 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 831 | .match = platform_match, |
a0245f7a | 832 | .uevent = platform_uevent, |
9d730229 | 833 | .pm = &platform_dev_pm_ops, |
1da177e4 | 834 | }; |
a96b2042 | 835 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
836 | |
837 | int __init platform_bus_init(void) | |
838 | { | |
fbfb1445 CH |
839 | int error; |
840 | ||
13977091 MD |
841 | early_platform_cleanup(); |
842 | ||
fbfb1445 CH |
843 | error = device_register(&platform_bus); |
844 | if (error) | |
845 | return error; | |
846 | error = bus_register(&platform_bus_type); | |
847 | if (error) | |
848 | device_unregister(&platform_bus); | |
849 | return error; | |
1da177e4 LT |
850 | } |
851 | ||
852 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
853 | u64 dma_get_required_mask(struct device *dev) | |
854 | { | |
855 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
856 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
857 | u64 mask; | |
858 | ||
859 | if (!high_totalram) { | |
860 | /* convert to mask just covering totalram */ | |
861 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
862 | low_totalram += low_totalram - 1; | |
863 | mask = low_totalram; | |
864 | } else { | |
865 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
866 | high_totalram += high_totalram - 1; | |
867 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
868 | } | |
e88a0c2c | 869 | return mask; |
1da177e4 LT |
870 | } |
871 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
872 | #endif | |
13977091 MD |
873 | |
874 | static __initdata LIST_HEAD(early_platform_driver_list); | |
875 | static __initdata LIST_HEAD(early_platform_device_list); | |
876 | ||
877 | /** | |
4d26e139 | 878 | * early_platform_driver_register - register early platform driver |
d86c1302 | 879 | * @epdrv: early_platform driver structure |
13977091 | 880 | * @buf: string passed from early_param() |
4d26e139 MD |
881 | * |
882 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
883 | */ |
884 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
885 | char *buf) | |
886 | { | |
c60e0504 | 887 | char *tmp; |
13977091 MD |
888 | int n; |
889 | ||
890 | /* Simply add the driver to the end of the global list. | |
891 | * Drivers will by default be put on the list in compiled-in order. | |
892 | */ | |
893 | if (!epdrv->list.next) { | |
894 | INIT_LIST_HEAD(&epdrv->list); | |
895 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
896 | } | |
897 | ||
898 | /* If the user has specified device then make sure the driver | |
899 | * gets prioritized. The driver of the last device specified on | |
900 | * command line will be put first on the list. | |
901 | */ | |
902 | n = strlen(epdrv->pdrv->driver.name); | |
903 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
904 | list_move(&epdrv->list, &early_platform_driver_list); | |
905 | ||
c60e0504 MD |
906 | /* Allow passing parameters after device name */ |
907 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 908 | epdrv->requested_id = -1; |
c60e0504 MD |
909 | else { |
910 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
911 | &tmp, 10); | |
912 | ||
913 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
914 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
915 | n = 0; | |
916 | } else | |
917 | n += strcspn(&buf[n + 1], ",") + 1; | |
918 | } | |
919 | ||
920 | if (buf[n] == ',') | |
921 | n++; | |
922 | ||
923 | if (epdrv->bufsize) { | |
924 | memcpy(epdrv->buffer, &buf[n], | |
925 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
926 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
927 | } | |
13977091 MD |
928 | } |
929 | ||
930 | return 0; | |
931 | } | |
932 | ||
933 | /** | |
4d26e139 | 934 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
935 | * @devs: array of early platform devices to add |
936 | * @num: number of early platform devices in array | |
4d26e139 MD |
937 | * |
938 | * Used by early architecture code to register early platform devices and | |
939 | * their platform data. | |
13977091 MD |
940 | */ |
941 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
942 | { | |
943 | struct device *dev; | |
944 | int i; | |
945 | ||
946 | /* simply add the devices to list */ | |
947 | for (i = 0; i < num; i++) { | |
948 | dev = &devs[i]->dev; | |
949 | ||
950 | if (!dev->devres_head.next) { | |
951 | INIT_LIST_HEAD(&dev->devres_head); | |
952 | list_add_tail(&dev->devres_head, | |
953 | &early_platform_device_list); | |
954 | } | |
955 | } | |
956 | } | |
957 | ||
958 | /** | |
4d26e139 | 959 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 960 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
961 | * |
962 | * Used by architecture code to register all early platform drivers | |
963 | * for a certain class. If omitted then only early platform drivers | |
964 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
965 | */ |
966 | void __init early_platform_driver_register_all(char *class_str) | |
967 | { | |
968 | /* The "class_str" parameter may or may not be present on the kernel | |
969 | * command line. If it is present then there may be more than one | |
970 | * matching parameter. | |
971 | * | |
972 | * Since we register our early platform drivers using early_param() | |
973 | * we need to make sure that they also get registered in the case | |
974 | * when the parameter is missing from the kernel command line. | |
975 | * | |
976 | * We use parse_early_options() to make sure the early_param() gets | |
977 | * called at least once. The early_param() may be called more than | |
978 | * once since the name of the preferred device may be specified on | |
979 | * the kernel command line. early_platform_driver_register() handles | |
980 | * this case for us. | |
981 | */ | |
982 | parse_early_options(class_str); | |
983 | } | |
984 | ||
985 | /** | |
4d26e139 | 986 | * early_platform_match - find early platform device matching driver |
d86c1302 | 987 | * @epdrv: early platform driver structure |
13977091 MD |
988 | * @id: id to match against |
989 | */ | |
990 | static __init struct platform_device * | |
991 | early_platform_match(struct early_platform_driver *epdrv, int id) | |
992 | { | |
993 | struct platform_device *pd; | |
994 | ||
995 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
996 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
997 | if (pd->id == id) | |
998 | return pd; | |
999 | ||
1000 | return NULL; | |
1001 | } | |
1002 | ||
1003 | /** | |
4d26e139 | 1004 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1005 | * @epdrv: early platform driver structure |
13977091 MD |
1006 | * @id: return true if id or above exists |
1007 | */ | |
1008 | static __init int early_platform_left(struct early_platform_driver *epdrv, | |
1009 | int id) | |
1010 | { | |
1011 | struct platform_device *pd; | |
1012 | ||
1013 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1014 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1015 | if (pd->id >= id) | |
1016 | return 1; | |
1017 | ||
1018 | return 0; | |
1019 | } | |
1020 | ||
1021 | /** | |
4d26e139 | 1022 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1023 | * @class_str: string to identify early platform driver class |
1024 | * @id: id to match against | |
1025 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1026 | */ | |
1027 | static int __init early_platform_driver_probe_id(char *class_str, | |
1028 | int id, | |
1029 | int nr_probe) | |
1030 | { | |
1031 | struct early_platform_driver *epdrv; | |
1032 | struct platform_device *match; | |
1033 | int match_id; | |
1034 | int n = 0; | |
1035 | int left = 0; | |
1036 | ||
1037 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1038 | /* only use drivers matching our class_str */ | |
1039 | if (strcmp(class_str, epdrv->class_str)) | |
1040 | continue; | |
1041 | ||
1042 | if (id == -2) { | |
1043 | match_id = epdrv->requested_id; | |
1044 | left = 1; | |
1045 | ||
1046 | } else { | |
1047 | match_id = id; | |
1048 | left += early_platform_left(epdrv, id); | |
1049 | ||
1050 | /* skip requested id */ | |
1051 | switch (epdrv->requested_id) { | |
1052 | case EARLY_PLATFORM_ID_ERROR: | |
1053 | case EARLY_PLATFORM_ID_UNSET: | |
1054 | break; | |
1055 | default: | |
1056 | if (epdrv->requested_id == id) | |
1057 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1058 | } | |
1059 | } | |
1060 | ||
1061 | switch (match_id) { | |
1062 | case EARLY_PLATFORM_ID_ERROR: | |
1063 | pr_warning("%s: unable to parse %s parameter\n", | |
1064 | class_str, epdrv->pdrv->driver.name); | |
1065 | /* fall-through */ | |
1066 | case EARLY_PLATFORM_ID_UNSET: | |
1067 | match = NULL; | |
1068 | break; | |
1069 | default: | |
1070 | match = early_platform_match(epdrv, match_id); | |
1071 | } | |
1072 | ||
1073 | if (match) { | |
a636ee7f PM |
1074 | /* |
1075 | * Set up a sensible init_name to enable | |
1076 | * dev_name() and others to be used before the | |
1077 | * rest of the driver core is initialized. | |
1078 | */ | |
06fe53be | 1079 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1080 | if (match->id != -1) |
bd05086b PM |
1081 | match->dev.init_name = |
1082 | kasprintf(GFP_KERNEL, "%s.%d", | |
1083 | match->name, | |
1084 | match->id); | |
a636ee7f | 1085 | else |
bd05086b PM |
1086 | match->dev.init_name = |
1087 | kasprintf(GFP_KERNEL, "%s", | |
1088 | match->name); | |
a636ee7f | 1089 | |
a636ee7f PM |
1090 | if (!match->dev.init_name) |
1091 | return -ENOMEM; | |
1092 | } | |
bd05086b | 1093 | |
13977091 MD |
1094 | if (epdrv->pdrv->probe(match)) |
1095 | pr_warning("%s: unable to probe %s early.\n", | |
1096 | class_str, match->name); | |
1097 | else | |
1098 | n++; | |
1099 | } | |
1100 | ||
1101 | if (n >= nr_probe) | |
1102 | break; | |
1103 | } | |
1104 | ||
1105 | if (left) | |
1106 | return n; | |
1107 | else | |
1108 | return -ENODEV; | |
1109 | } | |
1110 | ||
1111 | /** | |
4d26e139 | 1112 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1113 | * @class_str: string to identify early platform driver class |
1114 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1115 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1116 | * |
1117 | * Used by architecture code to probe registered early platform drivers | |
1118 | * within a certain class. For probe to happen a registered early platform | |
1119 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1120 | */ |
1121 | int __init early_platform_driver_probe(char *class_str, | |
1122 | int nr_probe, | |
1123 | int user_only) | |
1124 | { | |
1125 | int k, n, i; | |
1126 | ||
1127 | n = 0; | |
1128 | for (i = -2; n < nr_probe; i++) { | |
1129 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1130 | ||
1131 | if (k < 0) | |
1132 | break; | |
1133 | ||
1134 | n += k; | |
1135 | ||
1136 | if (user_only) | |
1137 | break; | |
1138 | } | |
1139 | ||
1140 | return n; | |
1141 | } | |
1142 | ||
1143 | /** | |
1144 | * early_platform_cleanup - clean up early platform code | |
1145 | */ | |
1146 | void __init early_platform_cleanup(void) | |
1147 | { | |
1148 | struct platform_device *pd, *pd2; | |
1149 | ||
1150 | /* clean up the devres list used to chain devices */ | |
1151 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1152 | dev.devres_head) { | |
1153 | list_del(&pd->dev.devres_head); | |
1154 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1155 | } | |
1156 | } | |
1157 |