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Commit | Line | Data |
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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 | |
36 | * @dev: platform device | |
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 | /** |
44f28bde UKK |
378 | * platform_device_register_resndata - add a platform-level device with |
379 | * resources and platform-specific data | |
49a4ec18 | 380 | * |
d8bf2540 DES |
381 | * @parent: parent device for the device we're adding |
382 | * @name: base name of the device we're adding | |
383 | * @id: instance id | |
44f28bde UKK |
384 | * @res: set of resources that needs to be allocated for the device |
385 | * @num: number of resources | |
d8bf2540 DES |
386 | * @data: platform specific data for this platform device |
387 | * @size: size of platform specific data | |
388 | * | |
f0eae0ed | 389 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 390 | */ |
bb2b43fe | 391 | struct platform_device *platform_device_register_resndata( |
d8bf2540 DES |
392 | struct device *parent, |
393 | const char *name, int id, | |
44f28bde | 394 | const struct resource *res, unsigned int num, |
d8bf2540 DES |
395 | const void *data, size_t size) |
396 | { | |
44f28bde | 397 | int ret = -ENOMEM; |
d8bf2540 | 398 | struct platform_device *pdev; |
d8bf2540 DES |
399 | |
400 | pdev = platform_device_alloc(name, id); | |
44f28bde UKK |
401 | if (!pdev) |
402 | goto err; | |
d8bf2540 DES |
403 | |
404 | pdev->dev.parent = parent; | |
405 | ||
807508c8 AV |
406 | ret = platform_device_add_resources(pdev, res, num); |
407 | if (ret) | |
408 | goto err; | |
44f28bde | 409 | |
807508c8 AV |
410 | ret = platform_device_add_data(pdev, data, size); |
411 | if (ret) | |
412 | goto err; | |
d8bf2540 | 413 | |
44f28bde UKK |
414 | ret = platform_device_add(pdev); |
415 | if (ret) { | |
416 | err: | |
417 | platform_device_put(pdev); | |
418 | return ERR_PTR(ret); | |
419 | } | |
d8bf2540 DES |
420 | |
421 | return pdev; | |
d8bf2540 | 422 | } |
44f28bde | 423 | EXPORT_SYMBOL_GPL(platform_device_register_resndata); |
d8bf2540 | 424 | |
00d3dcdd RK |
425 | static int platform_drv_probe(struct device *_dev) |
426 | { | |
427 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
428 | struct platform_device *dev = to_platform_device(_dev); | |
429 | ||
430 | return drv->probe(dev); | |
431 | } | |
432 | ||
c67334fb DB |
433 | static int platform_drv_probe_fail(struct device *_dev) |
434 | { | |
435 | return -ENXIO; | |
436 | } | |
437 | ||
00d3dcdd RK |
438 | static int platform_drv_remove(struct device *_dev) |
439 | { | |
440 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
441 | struct platform_device *dev = to_platform_device(_dev); | |
442 | ||
443 | return drv->remove(dev); | |
444 | } | |
445 | ||
446 | static void platform_drv_shutdown(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 | drv->shutdown(dev); | |
452 | } | |
453 | ||
00d3dcdd | 454 | /** |
3c31f07a | 455 | * platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 456 | * @drv: platform driver structure |
00d3dcdd RK |
457 | */ |
458 | int platform_driver_register(struct platform_driver *drv) | |
459 | { | |
460 | drv->driver.bus = &platform_bus_type; | |
461 | if (drv->probe) | |
462 | drv->driver.probe = platform_drv_probe; | |
463 | if (drv->remove) | |
464 | drv->driver.remove = platform_drv_remove; | |
465 | if (drv->shutdown) | |
466 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 467 | |
00d3dcdd RK |
468 | return driver_register(&drv->driver); |
469 | } | |
470 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
471 | ||
472 | /** | |
3c31f07a | 473 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 474 | * @drv: platform driver structure |
00d3dcdd RK |
475 | */ |
476 | void platform_driver_unregister(struct platform_driver *drv) | |
477 | { | |
478 | driver_unregister(&drv->driver); | |
479 | } | |
480 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
481 | ||
c67334fb DB |
482 | /** |
483 | * platform_driver_probe - register driver for non-hotpluggable device | |
484 | * @drv: platform driver structure | |
485 | * @probe: the driver probe routine, probably from an __init section | |
486 | * | |
487 | * Use this instead of platform_driver_register() when you know the device | |
488 | * is not hotpluggable and has already been registered, and you want to | |
489 | * remove its run-once probe() infrastructure from memory after the driver | |
490 | * has bound to the device. | |
491 | * | |
492 | * One typical use for this would be with drivers for controllers integrated | |
493 | * into system-on-chip processors, where the controller devices have been | |
494 | * configured as part of board setup. | |
495 | * | |
496 | * Returns zero if the driver registered and bound to a device, else returns | |
497 | * a negative error code and with the driver not registered. | |
498 | */ | |
c63e0783 | 499 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
500 | int (*probe)(struct platform_device *)) |
501 | { | |
502 | int retval, code; | |
503 | ||
1a6f2a75 DT |
504 | /* make sure driver won't have bind/unbind attributes */ |
505 | drv->driver.suppress_bind_attrs = true; | |
506 | ||
c67334fb DB |
507 | /* temporary section violation during probe() */ |
508 | drv->probe = probe; | |
509 | retval = code = platform_driver_register(drv); | |
510 | ||
1a6f2a75 DT |
511 | /* |
512 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
513 | * the list of drivers in order to probe new devices. Check to see |
514 | * if the probe was successful, and make sure any forced probes of | |
515 | * new devices fail. | |
516 | */ | |
d79d3244 | 517 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb | 518 | drv->probe = NULL; |
e5dd1278 | 519 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
520 | retval = -ENODEV; |
521 | drv->driver.probe = platform_drv_probe_fail; | |
d79d3244 | 522 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
523 | |
524 | if (code != retval) | |
525 | platform_driver_unregister(drv); | |
526 | return retval; | |
527 | } | |
528 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 529 | |
ecdf6ceb DT |
530 | /** |
531 | * platform_create_bundle - register driver and create corresponding device | |
532 | * @driver: platform driver structure | |
533 | * @probe: the driver probe routine, probably from an __init section | |
534 | * @res: set of resources that needs to be allocated for the device | |
535 | * @n_res: number of resources | |
536 | * @data: platform specific data for this platform device | |
537 | * @size: size of platform specific data | |
538 | * | |
539 | * Use this in legacy-style modules that probe hardware directly and | |
540 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
541 | * |
542 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb DT |
543 | */ |
544 | struct platform_device * __init_or_module platform_create_bundle( | |
545 | struct platform_driver *driver, | |
546 | int (*probe)(struct platform_device *), | |
547 | struct resource *res, unsigned int n_res, | |
548 | const void *data, size_t size) | |
549 | { | |
550 | struct platform_device *pdev; | |
551 | int error; | |
552 | ||
553 | pdev = platform_device_alloc(driver->driver.name, -1); | |
554 | if (!pdev) { | |
555 | error = -ENOMEM; | |
556 | goto err_out; | |
557 | } | |
558 | ||
807508c8 AV |
559 | error = platform_device_add_resources(pdev, res, n_res); |
560 | if (error) | |
561 | goto err_pdev_put; | |
ecdf6ceb | 562 | |
807508c8 AV |
563 | error = platform_device_add_data(pdev, data, size); |
564 | if (error) | |
565 | goto err_pdev_put; | |
ecdf6ceb DT |
566 | |
567 | error = platform_device_add(pdev); | |
568 | if (error) | |
569 | goto err_pdev_put; | |
570 | ||
571 | error = platform_driver_probe(driver, probe); | |
572 | if (error) | |
573 | goto err_pdev_del; | |
574 | ||
575 | return pdev; | |
576 | ||
577 | err_pdev_del: | |
578 | platform_device_del(pdev); | |
579 | err_pdev_put: | |
580 | platform_device_put(pdev); | |
581 | err_out: | |
582 | return ERR_PTR(error); | |
583 | } | |
584 | EXPORT_SYMBOL_GPL(platform_create_bundle); | |
585 | ||
a0245f7a DB |
586 | /* modalias support enables more hands-off userspace setup: |
587 | * (a) environment variable lets new-style hotplug events work once system is | |
588 | * fully running: "modprobe $MODALIAS" | |
589 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
590 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
591 | */ | |
4a3ad20c GKH |
592 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
593 | char *buf) | |
a0245f7a DB |
594 | { |
595 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 596 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
597 | |
598 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
599 | } | |
600 | ||
601 | static struct device_attribute platform_dev_attrs[] = { | |
602 | __ATTR_RO(modalias), | |
603 | __ATTR_NULL, | |
604 | }; | |
605 | ||
7eff2e7a | 606 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
607 | { |
608 | struct platform_device *pdev = to_platform_device(dev); | |
eca39301 GL |
609 | int rc; |
610 | ||
611 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
612 | rc = of_device_uevent(dev,env); | |
613 | if (rc != -ENODEV) | |
614 | return rc; | |
a0245f7a | 615 | |
57fee4a5 | 616 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
0a26813c | 617 | pdev->name); |
a0245f7a DB |
618 | return 0; |
619 | } | |
620 | ||
57fee4a5 | 621 | static const struct platform_device_id *platform_match_id( |
831fad2f | 622 | const struct platform_device_id *id, |
57fee4a5 EM |
623 | struct platform_device *pdev) |
624 | { | |
625 | while (id->name[0]) { | |
626 | if (strcmp(pdev->name, id->name) == 0) { | |
627 | pdev->id_entry = id; | |
628 | return id; | |
629 | } | |
630 | id++; | |
631 | } | |
632 | return NULL; | |
633 | } | |
634 | ||
1da177e4 | 635 | /** |
4a3ad20c GKH |
636 | * platform_match - bind platform device to platform driver. |
637 | * @dev: device. | |
638 | * @drv: driver. | |
1da177e4 | 639 | * |
4a3ad20c GKH |
640 | * Platform device IDs are assumed to be encoded like this: |
641 | * "<name><instance>", where <name> is a short description of the type of | |
642 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
643 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
644 | * "<name>". So, extract the <name> from the platform_device structure, | |
645 | * and compare it against the name of the driver. Return whether they match | |
646 | * or not. | |
1da177e4 | 647 | */ |
4a3ad20c | 648 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 649 | { |
71b3e0c1 | 650 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
651 | struct platform_driver *pdrv = to_platform_driver(drv); |
652 | ||
05212157 GL |
653 | /* Attempt an OF style match first */ |
654 | if (of_driver_match_device(dev, drv)) | |
655 | return 1; | |
656 | ||
657 | /* Then try to match against the id table */ | |
57fee4a5 EM |
658 | if (pdrv->id_table) |
659 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 660 | |
57fee4a5 | 661 | /* fall-back to driver name match */ |
1e0b2cf9 | 662 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
663 | } |
664 | ||
25e18499 RW |
665 | #ifdef CONFIG_PM_SLEEP |
666 | ||
667 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 668 | { |
783ea7d4 MD |
669 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
670 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
671 | int ret = 0; |
672 | ||
783ea7d4 MD |
673 | if (dev->driver && pdrv->suspend) |
674 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
675 | |
676 | return ret; | |
677 | } | |
678 | ||
25e18499 | 679 | static int platform_legacy_resume(struct device *dev) |
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->resume) |
686 | ret = pdrv->resume(pdev); | |
9480e307 | 687 | |
1da177e4 LT |
688 | return ret; |
689 | } | |
690 | ||
69c9dd1e | 691 | int platform_pm_prepare(struct device *dev) |
25e18499 RW |
692 | { |
693 | struct device_driver *drv = dev->driver; | |
694 | int ret = 0; | |
695 | ||
696 | if (drv && drv->pm && drv->pm->prepare) | |
697 | ret = drv->pm->prepare(dev); | |
698 | ||
699 | return ret; | |
700 | } | |
701 | ||
69c9dd1e | 702 | void platform_pm_complete(struct device *dev) |
25e18499 RW |
703 | { |
704 | struct device_driver *drv = dev->driver; | |
705 | ||
706 | if (drv && drv->pm && drv->pm->complete) | |
707 | drv->pm->complete(dev); | |
708 | } | |
709 | ||
69c9dd1e | 710 | #endif /* CONFIG_PM_SLEEP */ |
9d730229 | 711 | |
25e18499 RW |
712 | #ifdef CONFIG_SUSPEND |
713 | ||
69c9dd1e | 714 | int platform_pm_suspend(struct device *dev) |
25e18499 RW |
715 | { |
716 | struct device_driver *drv = dev->driver; | |
717 | int ret = 0; | |
718 | ||
adf09493 RW |
719 | if (!drv) |
720 | return 0; | |
721 | ||
722 | if (drv->pm) { | |
25e18499 RW |
723 | if (drv->pm->suspend) |
724 | ret = drv->pm->suspend(dev); | |
725 | } else { | |
726 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
727 | } | |
728 | ||
729 | return ret; | |
730 | } | |
731 | ||
69c9dd1e | 732 | int platform_pm_suspend_noirq(struct device *dev) |
25e18499 | 733 | { |
adf09493 | 734 | struct device_driver *drv = dev->driver; |
25e18499 RW |
735 | int ret = 0; |
736 | ||
adf09493 | 737 | if (!drv) |
25e18499 RW |
738 | return 0; |
739 | ||
adf09493 RW |
740 | if (drv->pm) { |
741 | if (drv->pm->suspend_noirq) | |
742 | ret = drv->pm->suspend_noirq(dev); | |
25e18499 RW |
743 | } |
744 | ||
745 | return ret; | |
746 | } | |
747 | ||
69c9dd1e | 748 | int platform_pm_resume(struct device *dev) |
25e18499 RW |
749 | { |
750 | struct device_driver *drv = dev->driver; | |
751 | int ret = 0; | |
752 | ||
adf09493 RW |
753 | if (!drv) |
754 | return 0; | |
755 | ||
756 | if (drv->pm) { | |
25e18499 RW |
757 | if (drv->pm->resume) |
758 | ret = drv->pm->resume(dev); | |
759 | } else { | |
760 | ret = platform_legacy_resume(dev); | |
761 | } | |
762 | ||
763 | return ret; | |
764 | } | |
765 | ||
69c9dd1e | 766 | int platform_pm_resume_noirq(struct device *dev) |
25e18499 | 767 | { |
adf09493 | 768 | struct device_driver *drv = dev->driver; |
25e18499 RW |
769 | int ret = 0; |
770 | ||
adf09493 | 771 | if (!drv) |
25e18499 RW |
772 | return 0; |
773 | ||
adf09493 RW |
774 | if (drv->pm) { |
775 | if (drv->pm->resume_noirq) | |
776 | ret = drv->pm->resume_noirq(dev); | |
25e18499 RW |
777 | } |
778 | ||
779 | return ret; | |
780 | } | |
781 | ||
69c9dd1e | 782 | #endif /* CONFIG_SUSPEND */ |
25e18499 | 783 | |
1f112cee | 784 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 | 785 | |
69c9dd1e | 786 | int platform_pm_freeze(struct device *dev) |
25e18499 RW |
787 | { |
788 | struct device_driver *drv = dev->driver; | |
789 | int ret = 0; | |
790 | ||
791 | if (!drv) | |
792 | return 0; | |
793 | ||
794 | if (drv->pm) { | |
795 | if (drv->pm->freeze) | |
796 | ret = drv->pm->freeze(dev); | |
797 | } else { | |
798 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
799 | } | |
800 | ||
801 | return ret; | |
802 | } | |
803 | ||
69c9dd1e | 804 | int platform_pm_freeze_noirq(struct device *dev) |
25e18499 | 805 | { |
adf09493 | 806 | struct device_driver *drv = dev->driver; |
25e18499 RW |
807 | int ret = 0; |
808 | ||
adf09493 | 809 | if (!drv) |
25e18499 RW |
810 | return 0; |
811 | ||
adf09493 RW |
812 | if (drv->pm) { |
813 | if (drv->pm->freeze_noirq) | |
814 | ret = drv->pm->freeze_noirq(dev); | |
25e18499 RW |
815 | } |
816 | ||
817 | return ret; | |
818 | } | |
819 | ||
69c9dd1e | 820 | int platform_pm_thaw(struct device *dev) |
25e18499 RW |
821 | { |
822 | struct device_driver *drv = dev->driver; | |
823 | int ret = 0; | |
824 | ||
adf09493 RW |
825 | if (!drv) |
826 | return 0; | |
827 | ||
828 | if (drv->pm) { | |
25e18499 RW |
829 | if (drv->pm->thaw) |
830 | ret = drv->pm->thaw(dev); | |
831 | } else { | |
832 | ret = platform_legacy_resume(dev); | |
833 | } | |
834 | ||
835 | return ret; | |
836 | } | |
837 | ||
69c9dd1e | 838 | int platform_pm_thaw_noirq(struct device *dev) |
25e18499 | 839 | { |
adf09493 | 840 | struct device_driver *drv = dev->driver; |
25e18499 RW |
841 | int ret = 0; |
842 | ||
adf09493 | 843 | if (!drv) |
25e18499 RW |
844 | return 0; |
845 | ||
adf09493 RW |
846 | if (drv->pm) { |
847 | if (drv->pm->thaw_noirq) | |
848 | ret = drv->pm->thaw_noirq(dev); | |
25e18499 RW |
849 | } |
850 | ||
851 | return ret; | |
852 | } | |
853 | ||
69c9dd1e | 854 | int platform_pm_poweroff(struct device *dev) |
25e18499 RW |
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 | ||
69c9dd1e | 872 | int platform_pm_poweroff_noirq(struct device *dev) |
25e18499 | 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 | } |
884 | ||
885 | return ret; | |
886 | } | |
887 | ||
69c9dd1e | 888 | int platform_pm_restore(struct device *dev) |
25e18499 RW |
889 | { |
890 | struct device_driver *drv = dev->driver; | |
891 | int ret = 0; | |
892 | ||
adf09493 RW |
893 | if (!drv) |
894 | return 0; | |
895 | ||
896 | if (drv->pm) { | |
25e18499 RW |
897 | if (drv->pm->restore) |
898 | ret = drv->pm->restore(dev); | |
899 | } else { | |
900 | ret = platform_legacy_resume(dev); | |
901 | } | |
902 | ||
903 | return ret; | |
904 | } | |
905 | ||
69c9dd1e | 906 | int platform_pm_restore_noirq(struct device *dev) |
25e18499 | 907 | { |
adf09493 | 908 | struct device_driver *drv = dev->driver; |
25e18499 RW |
909 | int ret = 0; |
910 | ||
adf09493 | 911 | if (!drv) |
25e18499 RW |
912 | return 0; |
913 | ||
adf09493 RW |
914 | if (drv->pm) { |
915 | if (drv->pm->restore_noirq) | |
916 | ret = drv->pm->restore_noirq(dev); | |
25e18499 RW |
917 | } |
918 | ||
919 | return ret; | |
920 | } | |
921 | ||
69c9dd1e | 922 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 923 | |
d9ab7716 | 924 | static const struct dev_pm_ops platform_dev_pm_ops = { |
8b313a38 RW |
925 | .runtime_suspend = pm_generic_runtime_suspend, |
926 | .runtime_resume = pm_generic_runtime_resume, | |
927 | .runtime_idle = pm_generic_runtime_idle, | |
69c9dd1e | 928 | USE_PLATFORM_PM_SLEEP_OPS |
25e18499 RW |
929 | }; |
930 | ||
1da177e4 LT |
931 | struct bus_type platform_bus_type = { |
932 | .name = "platform", | |
a0245f7a | 933 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 934 | .match = platform_match, |
a0245f7a | 935 | .uevent = platform_uevent, |
9d730229 | 936 | .pm = &platform_dev_pm_ops, |
1da177e4 | 937 | }; |
a96b2042 | 938 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
939 | |
940 | int __init platform_bus_init(void) | |
941 | { | |
fbfb1445 CH |
942 | int error; |
943 | ||
13977091 MD |
944 | early_platform_cleanup(); |
945 | ||
fbfb1445 CH |
946 | error = device_register(&platform_bus); |
947 | if (error) | |
948 | return error; | |
949 | error = bus_register(&platform_bus_type); | |
950 | if (error) | |
951 | device_unregister(&platform_bus); | |
952 | return error; | |
1da177e4 LT |
953 | } |
954 | ||
955 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
956 | u64 dma_get_required_mask(struct device *dev) | |
957 | { | |
958 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
959 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
960 | u64 mask; | |
961 | ||
962 | if (!high_totalram) { | |
963 | /* convert to mask just covering totalram */ | |
964 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
965 | low_totalram += low_totalram - 1; | |
966 | mask = low_totalram; | |
967 | } else { | |
968 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
969 | high_totalram += high_totalram - 1; | |
970 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
971 | } | |
e88a0c2c | 972 | return mask; |
1da177e4 LT |
973 | } |
974 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
975 | #endif | |
13977091 MD |
976 | |
977 | static __initdata LIST_HEAD(early_platform_driver_list); | |
978 | static __initdata LIST_HEAD(early_platform_device_list); | |
979 | ||
980 | /** | |
4d26e139 | 981 | * early_platform_driver_register - register early platform driver |
d86c1302 | 982 | * @epdrv: early_platform driver structure |
13977091 | 983 | * @buf: string passed from early_param() |
4d26e139 MD |
984 | * |
985 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
986 | */ |
987 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
988 | char *buf) | |
989 | { | |
c60e0504 | 990 | char *tmp; |
13977091 MD |
991 | int n; |
992 | ||
993 | /* Simply add the driver to the end of the global list. | |
994 | * Drivers will by default be put on the list in compiled-in order. | |
995 | */ | |
996 | if (!epdrv->list.next) { | |
997 | INIT_LIST_HEAD(&epdrv->list); | |
998 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
999 | } | |
1000 | ||
1001 | /* If the user has specified device then make sure the driver | |
1002 | * gets prioritized. The driver of the last device specified on | |
1003 | * command line will be put first on the list. | |
1004 | */ | |
1005 | n = strlen(epdrv->pdrv->driver.name); | |
1006 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
1007 | list_move(&epdrv->list, &early_platform_driver_list); | |
1008 | ||
c60e0504 MD |
1009 | /* Allow passing parameters after device name */ |
1010 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 1011 | epdrv->requested_id = -1; |
c60e0504 MD |
1012 | else { |
1013 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
1014 | &tmp, 10); | |
1015 | ||
1016 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
1017 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
1018 | n = 0; | |
1019 | } else | |
1020 | n += strcspn(&buf[n + 1], ",") + 1; | |
1021 | } | |
1022 | ||
1023 | if (buf[n] == ',') | |
1024 | n++; | |
1025 | ||
1026 | if (epdrv->bufsize) { | |
1027 | memcpy(epdrv->buffer, &buf[n], | |
1028 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
1029 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
1030 | } | |
13977091 MD |
1031 | } |
1032 | ||
1033 | return 0; | |
1034 | } | |
1035 | ||
1036 | /** | |
4d26e139 | 1037 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
1038 | * @devs: array of early platform devices to add |
1039 | * @num: number of early platform devices in array | |
4d26e139 MD |
1040 | * |
1041 | * Used by early architecture code to register early platform devices and | |
1042 | * their platform data. | |
13977091 MD |
1043 | */ |
1044 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1045 | { | |
1046 | struct device *dev; | |
1047 | int i; | |
1048 | ||
1049 | /* simply add the devices to list */ | |
1050 | for (i = 0; i < num; i++) { | |
1051 | dev = &devs[i]->dev; | |
1052 | ||
1053 | if (!dev->devres_head.next) { | |
1054 | INIT_LIST_HEAD(&dev->devres_head); | |
1055 | list_add_tail(&dev->devres_head, | |
1056 | &early_platform_device_list); | |
1057 | } | |
1058 | } | |
1059 | } | |
1060 | ||
1061 | /** | |
4d26e139 | 1062 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 1063 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
1064 | * |
1065 | * Used by architecture code to register all early platform drivers | |
1066 | * for a certain class. If omitted then only early platform drivers | |
1067 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
1068 | */ |
1069 | void __init early_platform_driver_register_all(char *class_str) | |
1070 | { | |
1071 | /* The "class_str" parameter may or may not be present on the kernel | |
1072 | * command line. If it is present then there may be more than one | |
1073 | * matching parameter. | |
1074 | * | |
1075 | * Since we register our early platform drivers using early_param() | |
1076 | * we need to make sure that they also get registered in the case | |
1077 | * when the parameter is missing from the kernel command line. | |
1078 | * | |
1079 | * We use parse_early_options() to make sure the early_param() gets | |
1080 | * called at least once. The early_param() may be called more than | |
1081 | * once since the name of the preferred device may be specified on | |
1082 | * the kernel command line. early_platform_driver_register() handles | |
1083 | * this case for us. | |
1084 | */ | |
1085 | parse_early_options(class_str); | |
1086 | } | |
1087 | ||
1088 | /** | |
4d26e139 | 1089 | * early_platform_match - find early platform device matching driver |
d86c1302 | 1090 | * @epdrv: early platform driver structure |
13977091 MD |
1091 | * @id: id to match against |
1092 | */ | |
1093 | static __init struct platform_device * | |
1094 | early_platform_match(struct early_platform_driver *epdrv, int id) | |
1095 | { | |
1096 | struct platform_device *pd; | |
1097 | ||
1098 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1099 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1100 | if (pd->id == id) | |
1101 | return pd; | |
1102 | ||
1103 | return NULL; | |
1104 | } | |
1105 | ||
1106 | /** | |
4d26e139 | 1107 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1108 | * @epdrv: early platform driver structure |
13977091 MD |
1109 | * @id: return true if id or above exists |
1110 | */ | |
1111 | static __init int early_platform_left(struct early_platform_driver *epdrv, | |
1112 | int id) | |
1113 | { | |
1114 | struct platform_device *pd; | |
1115 | ||
1116 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1117 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1118 | if (pd->id >= id) | |
1119 | return 1; | |
1120 | ||
1121 | return 0; | |
1122 | } | |
1123 | ||
1124 | /** | |
4d26e139 | 1125 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1126 | * @class_str: string to identify early platform driver class |
1127 | * @id: id to match against | |
1128 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1129 | */ | |
1130 | static int __init early_platform_driver_probe_id(char *class_str, | |
1131 | int id, | |
1132 | int nr_probe) | |
1133 | { | |
1134 | struct early_platform_driver *epdrv; | |
1135 | struct platform_device *match; | |
1136 | int match_id; | |
1137 | int n = 0; | |
1138 | int left = 0; | |
1139 | ||
1140 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1141 | /* only use drivers matching our class_str */ | |
1142 | if (strcmp(class_str, epdrv->class_str)) | |
1143 | continue; | |
1144 | ||
1145 | if (id == -2) { | |
1146 | match_id = epdrv->requested_id; | |
1147 | left = 1; | |
1148 | ||
1149 | } else { | |
1150 | match_id = id; | |
1151 | left += early_platform_left(epdrv, id); | |
1152 | ||
1153 | /* skip requested id */ | |
1154 | switch (epdrv->requested_id) { | |
1155 | case EARLY_PLATFORM_ID_ERROR: | |
1156 | case EARLY_PLATFORM_ID_UNSET: | |
1157 | break; | |
1158 | default: | |
1159 | if (epdrv->requested_id == id) | |
1160 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1161 | } | |
1162 | } | |
1163 | ||
1164 | switch (match_id) { | |
1165 | case EARLY_PLATFORM_ID_ERROR: | |
1166 | pr_warning("%s: unable to parse %s parameter\n", | |
1167 | class_str, epdrv->pdrv->driver.name); | |
1168 | /* fall-through */ | |
1169 | case EARLY_PLATFORM_ID_UNSET: | |
1170 | match = NULL; | |
1171 | break; | |
1172 | default: | |
1173 | match = early_platform_match(epdrv, match_id); | |
1174 | } | |
1175 | ||
1176 | if (match) { | |
a636ee7f PM |
1177 | /* |
1178 | * Set up a sensible init_name to enable | |
1179 | * dev_name() and others to be used before the | |
1180 | * rest of the driver core is initialized. | |
1181 | */ | |
06fe53be | 1182 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1183 | if (match->id != -1) |
bd05086b PM |
1184 | match->dev.init_name = |
1185 | kasprintf(GFP_KERNEL, "%s.%d", | |
1186 | match->name, | |
1187 | match->id); | |
a636ee7f | 1188 | else |
bd05086b PM |
1189 | match->dev.init_name = |
1190 | kasprintf(GFP_KERNEL, "%s", | |
1191 | match->name); | |
a636ee7f | 1192 | |
a636ee7f PM |
1193 | if (!match->dev.init_name) |
1194 | return -ENOMEM; | |
1195 | } | |
bd05086b | 1196 | |
13977091 MD |
1197 | if (epdrv->pdrv->probe(match)) |
1198 | pr_warning("%s: unable to probe %s early.\n", | |
1199 | class_str, match->name); | |
1200 | else | |
1201 | n++; | |
1202 | } | |
1203 | ||
1204 | if (n >= nr_probe) | |
1205 | break; | |
1206 | } | |
1207 | ||
1208 | if (left) | |
1209 | return n; | |
1210 | else | |
1211 | return -ENODEV; | |
1212 | } | |
1213 | ||
1214 | /** | |
4d26e139 | 1215 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1216 | * @class_str: string to identify early platform driver class |
1217 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1218 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1219 | * |
1220 | * Used by architecture code to probe registered early platform drivers | |
1221 | * within a certain class. For probe to happen a registered early platform | |
1222 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1223 | */ |
1224 | int __init early_platform_driver_probe(char *class_str, | |
1225 | int nr_probe, | |
1226 | int user_only) | |
1227 | { | |
1228 | int k, n, i; | |
1229 | ||
1230 | n = 0; | |
1231 | for (i = -2; n < nr_probe; i++) { | |
1232 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1233 | ||
1234 | if (k < 0) | |
1235 | break; | |
1236 | ||
1237 | n += k; | |
1238 | ||
1239 | if (user_only) | |
1240 | break; | |
1241 | } | |
1242 | ||
1243 | return n; | |
1244 | } | |
1245 | ||
1246 | /** | |
1247 | * early_platform_cleanup - clean up early platform code | |
1248 | */ | |
1249 | void __init early_platform_cleanup(void) | |
1250 | { | |
1251 | struct platform_device *pd, *pd2; | |
1252 | ||
1253 | /* clean up the devres list used to chain devices */ | |
1254 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1255 | dev.devres_head) { | |
1256 | list_del(&pd->dev.devres_head); | |
1257 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1258 | } | |
1259 | } | |
1260 |