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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> |
689ae231 | 23 | #include <linux/idr.h> |
1da177e4 | 24 | |
a1bdc7aa | 25 | #include "base.h" |
bed2b42d | 26 | #include "power/power.h" |
a1bdc7aa | 27 | |
689ae231 JD |
28 | /* For automatically allocated device IDs */ |
29 | static DEFINE_IDA(platform_devid_ida); | |
30 | ||
4a3ad20c GKH |
31 | #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \ |
32 | driver)) | |
00d3dcdd | 33 | |
1da177e4 | 34 | struct device platform_bus = { |
1e0b2cf9 | 35 | .init_name = "platform", |
1da177e4 | 36 | }; |
a96b2042 | 37 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 | 38 | |
a77ce816 KG |
39 | /** |
40 | * arch_setup_pdev_archdata - Allow manipulation of archdata before its used | |
7de636fa | 41 | * @pdev: platform device |
a77ce816 KG |
42 | * |
43 | * This is called before platform_device_add() such that any pdev_archdata may | |
44 | * be setup before the platform_notifier is called. So if a user needs to | |
45 | * manipulate any relevant information in the pdev_archdata they can do: | |
46 | * | |
47 | * platform_devic_alloc() | |
48 | * ... manipulate ... | |
49 | * platform_device_add() | |
50 | * | |
51 | * And if they don't care they can just call platform_device_register() and | |
52 | * everything will just work out. | |
53 | */ | |
54 | void __weak arch_setup_pdev_archdata(struct platform_device *pdev) | |
55 | { | |
56 | } | |
57 | ||
1da177e4 | 58 | /** |
4a3ad20c GKH |
59 | * platform_get_resource - get a resource for a device |
60 | * @dev: platform device | |
61 | * @type: resource type | |
62 | * @num: resource index | |
1da177e4 | 63 | */ |
4a3ad20c GKH |
64 | struct resource *platform_get_resource(struct platform_device *dev, |
65 | unsigned int type, unsigned int num) | |
1da177e4 LT |
66 | { |
67 | int i; | |
68 | ||
69 | for (i = 0; i < dev->num_resources; i++) { | |
70 | struct resource *r = &dev->resource[i]; | |
71 | ||
c9f66169 MD |
72 | if (type == resource_type(r) && num-- == 0) |
73 | return r; | |
1da177e4 LT |
74 | } |
75 | return NULL; | |
76 | } | |
a96b2042 | 77 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
78 | |
79 | /** | |
4a3ad20c GKH |
80 | * platform_get_irq - get an IRQ for a device |
81 | * @dev: platform device | |
82 | * @num: IRQ number index | |
1da177e4 LT |
83 | */ |
84 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
85 | { | |
86 | struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
87 | ||
305b3228 | 88 | return r ? r->start : -ENXIO; |
1da177e4 | 89 | } |
a96b2042 | 90 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
91 | |
92 | /** | |
4a3ad20c GKH |
93 | * platform_get_resource_byname - get a resource for a device by name |
94 | * @dev: platform device | |
95 | * @type: resource type | |
96 | * @name: resource name | |
1da177e4 | 97 | */ |
4a3ad20c | 98 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
99 | unsigned int type, |
100 | const char *name) | |
1da177e4 LT |
101 | { |
102 | int i; | |
103 | ||
104 | for (i = 0; i < dev->num_resources; i++) { | |
105 | struct resource *r = &dev->resource[i]; | |
106 | ||
1b8cb929 PU |
107 | if (unlikely(!r->name)) |
108 | continue; | |
109 | ||
c9f66169 MD |
110 | if (type == resource_type(r) && !strcmp(r->name, name)) |
111 | return r; | |
1da177e4 LT |
112 | } |
113 | return NULL; | |
114 | } | |
a96b2042 | 115 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
116 | |
117 | /** | |
4a3ad20c GKH |
118 | * platform_get_irq - get an IRQ for a device |
119 | * @dev: platform device | |
120 | * @name: IRQ name | |
1da177e4 | 121 | */ |
c0afe7ba | 122 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
1da177e4 | 123 | { |
4a3ad20c GKH |
124 | struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, |
125 | name); | |
1da177e4 | 126 | |
305b3228 | 127 | return r ? r->start : -ENXIO; |
1da177e4 | 128 | } |
a96b2042 | 129 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
130 | |
131 | /** | |
4a3ad20c GKH |
132 | * platform_add_devices - add a numbers of platform devices |
133 | * @devs: array of platform devices to add | |
134 | * @num: number of platform devices in array | |
1da177e4 LT |
135 | */ |
136 | int platform_add_devices(struct platform_device **devs, int num) | |
137 | { | |
138 | int i, ret = 0; | |
139 | ||
140 | for (i = 0; i < num; i++) { | |
141 | ret = platform_device_register(devs[i]); | |
142 | if (ret) { | |
143 | while (--i >= 0) | |
144 | platform_device_unregister(devs[i]); | |
145 | break; | |
146 | } | |
147 | } | |
148 | ||
149 | return ret; | |
150 | } | |
a96b2042 | 151 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 152 | |
37c12e74 RK |
153 | struct platform_object { |
154 | struct platform_device pdev; | |
155 | char name[1]; | |
156 | }; | |
157 | ||
1da177e4 | 158 | /** |
3c31f07a | 159 | * platform_device_put - destroy a platform device |
4a3ad20c | 160 | * @pdev: platform device to free |
37c12e74 | 161 | * |
4a3ad20c GKH |
162 | * Free all memory associated with a platform device. This function must |
163 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
164 | */ |
165 | void platform_device_put(struct platform_device *pdev) | |
166 | { | |
167 | if (pdev) | |
168 | put_device(&pdev->dev); | |
169 | } | |
170 | EXPORT_SYMBOL_GPL(platform_device_put); | |
171 | ||
172 | static void platform_device_release(struct device *dev) | |
173 | { | |
4a3ad20c GKH |
174 | struct platform_object *pa = container_of(dev, struct platform_object, |
175 | pdev.dev); | |
37c12e74 | 176 | |
7096d042 | 177 | of_device_node_put(&pa->pdev.dev); |
37c12e74 | 178 | kfree(pa->pdev.dev.platform_data); |
e710d7d5 | 179 | kfree(pa->pdev.mfd_cell); |
37c12e74 RK |
180 | kfree(pa->pdev.resource); |
181 | kfree(pa); | |
182 | } | |
183 | ||
184 | /** | |
3c31f07a | 185 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
186 | * @name: base name of the device we're adding |
187 | * @id: instance id | |
37c12e74 | 188 | * |
4a3ad20c GKH |
189 | * Create a platform device object which can have other objects attached |
190 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 191 | */ |
1359555e | 192 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
193 | { |
194 | struct platform_object *pa; | |
195 | ||
196 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); | |
197 | if (pa) { | |
198 | strcpy(pa->name, name); | |
199 | pa->pdev.name = pa->name; | |
200 | pa->pdev.id = id; | |
201 | device_initialize(&pa->pdev.dev); | |
202 | pa->pdev.dev.release = platform_device_release; | |
a77ce816 | 203 | arch_setup_pdev_archdata(&pa->pdev); |
37c12e74 RK |
204 | } |
205 | ||
93ce3061 | 206 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
207 | } |
208 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
209 | ||
210 | /** | |
3c31f07a | 211 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
212 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
213 | * @res: set of resources that needs to be allocated for the device | |
214 | * @num: number of resources | |
37c12e74 | 215 | * |
4a3ad20c GKH |
216 | * Add a copy of the resources to the platform device. The memory |
217 | * associated with the resources will be freed when the platform device is | |
218 | * released. | |
37c12e74 | 219 | */ |
4a3ad20c | 220 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 221 | const struct resource *res, unsigned int num) |
37c12e74 | 222 | { |
cea89623 | 223 | struct resource *r = NULL; |
37c12e74 | 224 | |
cea89623 UKK |
225 | if (res) { |
226 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); | |
227 | if (!r) | |
228 | return -ENOMEM; | |
37c12e74 | 229 | } |
cea89623 | 230 | |
4a03d6f7 | 231 | kfree(pdev->resource); |
cea89623 UKK |
232 | pdev->resource = r; |
233 | pdev->num_resources = num; | |
234 | return 0; | |
37c12e74 RK |
235 | } |
236 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
237 | ||
238 | /** | |
3c31f07a | 239 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
240 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
241 | * @data: platform specific data for this platform device | |
242 | * @size: size of platform specific data | |
37c12e74 | 243 | * |
4a3ad20c GKH |
244 | * Add a copy of platform specific data to the platform device's |
245 | * platform_data pointer. The memory associated with the platform data | |
246 | * will be freed when the platform device is released. | |
37c12e74 | 247 | */ |
4a3ad20c GKH |
248 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
249 | size_t size) | |
37c12e74 | 250 | { |
27a33f9e | 251 | void *d = NULL; |
5cfc64ce | 252 | |
27a33f9e UKK |
253 | if (data) { |
254 | d = kmemdup(data, size, GFP_KERNEL); | |
255 | if (!d) | |
256 | return -ENOMEM; | |
37c12e74 | 257 | } |
27a33f9e | 258 | |
251e031d | 259 | kfree(pdev->dev.platform_data); |
27a33f9e UKK |
260 | pdev->dev.platform_data = d; |
261 | return 0; | |
37c12e74 RK |
262 | } |
263 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
264 | ||
265 | /** | |
4a3ad20c GKH |
266 | * platform_device_add - add a platform device to device hierarchy |
267 | * @pdev: platform device we're adding | |
1da177e4 | 268 | * |
4a3ad20c GKH |
269 | * This is part 2 of platform_device_register(), though may be called |
270 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 271 | */ |
37c12e74 | 272 | int platform_device_add(struct platform_device *pdev) |
1da177e4 | 273 | { |
689ae231 | 274 | int i, ret; |
1da177e4 LT |
275 | |
276 | if (!pdev) | |
277 | return -EINVAL; | |
278 | ||
279 | if (!pdev->dev.parent) | |
280 | pdev->dev.parent = &platform_bus; | |
281 | ||
282 | pdev->dev.bus = &platform_bus_type; | |
283 | ||
689ae231 JD |
284 | switch (pdev->id) { |
285 | default: | |
1e0b2cf9 | 286 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
689ae231 JD |
287 | break; |
288 | case PLATFORM_DEVID_NONE: | |
acc0e90f | 289 | dev_set_name(&pdev->dev, "%s", pdev->name); |
689ae231 JD |
290 | break; |
291 | case PLATFORM_DEVID_AUTO: | |
292 | /* | |
293 | * Automatically allocated device ID. We mark it as such so | |
294 | * that we remember it must be freed, and we append a suffix | |
295 | * to avoid namespace collision with explicit IDs. | |
296 | */ | |
297 | ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL); | |
298 | if (ret < 0) | |
299 | goto err_out; | |
300 | pdev->id = ret; | |
301 | pdev->id_auto = true; | |
302 | dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); | |
303 | break; | |
304 | } | |
1da177e4 LT |
305 | |
306 | for (i = 0; i < pdev->num_resources; i++) { | |
307 | struct resource *p, *r = &pdev->resource[i]; | |
308 | ||
309 | if (r->name == NULL) | |
1e0b2cf9 | 310 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
311 | |
312 | p = r->parent; | |
313 | if (!p) { | |
c9f66169 | 314 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 315 | p = &iomem_resource; |
c9f66169 | 316 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
317 | p = &ioport_resource; |
318 | } | |
319 | ||
d960bb4d | 320 | if (p && insert_resource(p, r)) { |
1da177e4 LT |
321 | printk(KERN_ERR |
322 | "%s: failed to claim resource %d\n", | |
1e0b2cf9 | 323 | dev_name(&pdev->dev), i); |
1da177e4 LT |
324 | ret = -EBUSY; |
325 | goto failed; | |
326 | } | |
327 | } | |
328 | ||
329 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 330 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 331 | |
e3915532 | 332 | ret = device_add(&pdev->dev); |
1da177e4 LT |
333 | if (ret == 0) |
334 | return ret; | |
335 | ||
336 | failed: | |
689ae231 JD |
337 | if (pdev->id_auto) { |
338 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
339 | pdev->id = PLATFORM_DEVID_AUTO; | |
340 | } | |
341 | ||
c9f66169 MD |
342 | while (--i >= 0) { |
343 | struct resource *r = &pdev->resource[i]; | |
344 | unsigned long type = resource_type(r); | |
345 | ||
346 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
347 | release_resource(r); | |
348 | } | |
349 | ||
689ae231 | 350 | err_out: |
1da177e4 LT |
351 | return ret; |
352 | } | |
37c12e74 RK |
353 | EXPORT_SYMBOL_GPL(platform_device_add); |
354 | ||
355 | /** | |
4a3ad20c GKH |
356 | * platform_device_del - remove a platform-level device |
357 | * @pdev: platform device we're removing | |
1da177e4 | 358 | * |
4a3ad20c GKH |
359 | * Note that this function will also release all memory- and port-based |
360 | * resources owned by the device (@dev->resource). This function must | |
361 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 362 | */ |
93ce3061 | 363 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
364 | { |
365 | int i; | |
366 | ||
367 | if (pdev) { | |
dc4c15d4 JD |
368 | device_del(&pdev->dev); |
369 | ||
689ae231 JD |
370 | if (pdev->id_auto) { |
371 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
372 | pdev->id = PLATFORM_DEVID_AUTO; | |
373 | } | |
374 | ||
1da177e4 LT |
375 | for (i = 0; i < pdev->num_resources; i++) { |
376 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
377 | unsigned long type = resource_type(r); |
378 | ||
379 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
380 | release_resource(r); |
381 | } | |
1da177e4 LT |
382 | } |
383 | } | |
93ce3061 DT |
384 | EXPORT_SYMBOL_GPL(platform_device_del); |
385 | ||
386 | /** | |
4a3ad20c GKH |
387 | * platform_device_register - add a platform-level device |
388 | * @pdev: platform device we're adding | |
93ce3061 | 389 | */ |
4a3ad20c | 390 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
391 | { |
392 | device_initialize(&pdev->dev); | |
a77ce816 | 393 | arch_setup_pdev_archdata(pdev); |
93ce3061 DT |
394 | return platform_device_add(pdev); |
395 | } | |
a96b2042 | 396 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
397 | |
398 | /** | |
4a3ad20c GKH |
399 | * platform_device_unregister - unregister a platform-level device |
400 | * @pdev: platform device we're unregistering | |
93ce3061 | 401 | * |
4a3ad20c GKH |
402 | * Unregistration is done in 2 steps. First we release all resources |
403 | * and remove it from the subsystem, then we drop reference count by | |
404 | * calling platform_device_put(). | |
93ce3061 | 405 | */ |
4a3ad20c | 406 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
407 | { |
408 | platform_device_del(pdev); | |
409 | platform_device_put(pdev); | |
410 | } | |
a96b2042 | 411 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 412 | |
1da177e4 | 413 | /** |
01dcc60a | 414 | * platform_device_register_full - add a platform-level device with |
44f28bde | 415 | * resources and platform-specific data |
49a4ec18 | 416 | * |
01dcc60a | 417 | * @pdevinfo: data used to create device |
d8bf2540 | 418 | * |
f0eae0ed | 419 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 420 | */ |
01dcc60a | 421 | struct platform_device *platform_device_register_full( |
5a3072be | 422 | const struct platform_device_info *pdevinfo) |
d8bf2540 | 423 | { |
44f28bde | 424 | int ret = -ENOMEM; |
d8bf2540 | 425 | struct platform_device *pdev; |
d8bf2540 | 426 | |
01dcc60a | 427 | pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
44f28bde | 428 | if (!pdev) |
01dcc60a UKK |
429 | goto err_alloc; |
430 | ||
431 | pdev->dev.parent = pdevinfo->parent; | |
432 | ||
433 | if (pdevinfo->dma_mask) { | |
434 | /* | |
435 | * This memory isn't freed when the device is put, | |
436 | * I don't have a nice idea for that though. Conceptually | |
437 | * dma_mask in struct device should not be a pointer. | |
438 | * See http://thread.gmane.org/gmane.linux.kernel.pci/9081 | |
439 | */ | |
440 | pdev->dev.dma_mask = | |
441 | kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); | |
442 | if (!pdev->dev.dma_mask) | |
443 | goto err; | |
444 | ||
445 | *pdev->dev.dma_mask = pdevinfo->dma_mask; | |
446 | pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; | |
447 | } | |
d8bf2540 | 448 | |
01dcc60a UKK |
449 | ret = platform_device_add_resources(pdev, |
450 | pdevinfo->res, pdevinfo->num_res); | |
807508c8 AV |
451 | if (ret) |
452 | goto err; | |
44f28bde | 453 | |
01dcc60a UKK |
454 | ret = platform_device_add_data(pdev, |
455 | pdevinfo->data, pdevinfo->size_data); | |
807508c8 AV |
456 | if (ret) |
457 | goto err; | |
d8bf2540 | 458 | |
44f28bde UKK |
459 | ret = platform_device_add(pdev); |
460 | if (ret) { | |
461 | err: | |
01dcc60a UKK |
462 | kfree(pdev->dev.dma_mask); |
463 | ||
464 | err_alloc: | |
44f28bde UKK |
465 | platform_device_put(pdev); |
466 | return ERR_PTR(ret); | |
467 | } | |
d8bf2540 DES |
468 | |
469 | return pdev; | |
d8bf2540 | 470 | } |
01dcc60a | 471 | EXPORT_SYMBOL_GPL(platform_device_register_full); |
d8bf2540 | 472 | |
00d3dcdd RK |
473 | static int platform_drv_probe(struct device *_dev) |
474 | { | |
475 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
476 | struct platform_device *dev = to_platform_device(_dev); | |
477 | ||
478 | return drv->probe(dev); | |
479 | } | |
480 | ||
c67334fb DB |
481 | static int platform_drv_probe_fail(struct device *_dev) |
482 | { | |
483 | return -ENXIO; | |
484 | } | |
485 | ||
00d3dcdd RK |
486 | static int platform_drv_remove(struct device *_dev) |
487 | { | |
488 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
489 | struct platform_device *dev = to_platform_device(_dev); | |
490 | ||
491 | return drv->remove(dev); | |
492 | } | |
493 | ||
494 | static void platform_drv_shutdown(struct device *_dev) | |
495 | { | |
496 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
497 | struct platform_device *dev = to_platform_device(_dev); | |
498 | ||
499 | drv->shutdown(dev); | |
500 | } | |
501 | ||
00d3dcdd | 502 | /** |
3c31f07a | 503 | * platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 504 | * @drv: platform driver structure |
00d3dcdd RK |
505 | */ |
506 | int platform_driver_register(struct platform_driver *drv) | |
507 | { | |
508 | drv->driver.bus = &platform_bus_type; | |
509 | if (drv->probe) | |
510 | drv->driver.probe = platform_drv_probe; | |
511 | if (drv->remove) | |
512 | drv->driver.remove = platform_drv_remove; | |
513 | if (drv->shutdown) | |
514 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 515 | |
00d3dcdd RK |
516 | return driver_register(&drv->driver); |
517 | } | |
518 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
519 | ||
520 | /** | |
3c31f07a | 521 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 522 | * @drv: platform driver structure |
00d3dcdd RK |
523 | */ |
524 | void platform_driver_unregister(struct platform_driver *drv) | |
525 | { | |
526 | driver_unregister(&drv->driver); | |
527 | } | |
528 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
529 | ||
c67334fb DB |
530 | /** |
531 | * platform_driver_probe - register driver for non-hotpluggable device | |
532 | * @drv: platform driver structure | |
533 | * @probe: the driver probe routine, probably from an __init section | |
534 | * | |
535 | * Use this instead of platform_driver_register() when you know the device | |
536 | * is not hotpluggable and has already been registered, and you want to | |
537 | * remove its run-once probe() infrastructure from memory after the driver | |
538 | * has bound to the device. | |
539 | * | |
540 | * One typical use for this would be with drivers for controllers integrated | |
541 | * into system-on-chip processors, where the controller devices have been | |
542 | * configured as part of board setup. | |
543 | * | |
544 | * Returns zero if the driver registered and bound to a device, else returns | |
545 | * a negative error code and with the driver not registered. | |
546 | */ | |
c63e0783 | 547 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
548 | int (*probe)(struct platform_device *)) |
549 | { | |
550 | int retval, code; | |
551 | ||
1a6f2a75 DT |
552 | /* make sure driver won't have bind/unbind attributes */ |
553 | drv->driver.suppress_bind_attrs = true; | |
554 | ||
c67334fb DB |
555 | /* temporary section violation during probe() */ |
556 | drv->probe = probe; | |
557 | retval = code = platform_driver_register(drv); | |
558 | ||
1a6f2a75 DT |
559 | /* |
560 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
561 | * the list of drivers in order to probe new devices. Check to see |
562 | * if the probe was successful, and make sure any forced probes of | |
563 | * new devices fail. | |
564 | */ | |
d79d3244 | 565 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb | 566 | drv->probe = NULL; |
e5dd1278 | 567 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
568 | retval = -ENODEV; |
569 | drv->driver.probe = platform_drv_probe_fail; | |
d79d3244 | 570 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
571 | |
572 | if (code != retval) | |
573 | platform_driver_unregister(drv); | |
574 | return retval; | |
575 | } | |
576 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 577 | |
ecdf6ceb DT |
578 | /** |
579 | * platform_create_bundle - register driver and create corresponding device | |
580 | * @driver: platform driver structure | |
581 | * @probe: the driver probe routine, probably from an __init section | |
582 | * @res: set of resources that needs to be allocated for the device | |
583 | * @n_res: number of resources | |
584 | * @data: platform specific data for this platform device | |
585 | * @size: size of platform specific data | |
586 | * | |
587 | * Use this in legacy-style modules that probe hardware directly and | |
588 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
589 | * |
590 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb DT |
591 | */ |
592 | struct platform_device * __init_or_module platform_create_bundle( | |
593 | struct platform_driver *driver, | |
594 | int (*probe)(struct platform_device *), | |
595 | struct resource *res, unsigned int n_res, | |
596 | const void *data, size_t size) | |
597 | { | |
598 | struct platform_device *pdev; | |
599 | int error; | |
600 | ||
601 | pdev = platform_device_alloc(driver->driver.name, -1); | |
602 | if (!pdev) { | |
603 | error = -ENOMEM; | |
604 | goto err_out; | |
605 | } | |
606 | ||
807508c8 AV |
607 | error = platform_device_add_resources(pdev, res, n_res); |
608 | if (error) | |
609 | goto err_pdev_put; | |
ecdf6ceb | 610 | |
807508c8 AV |
611 | error = platform_device_add_data(pdev, data, size); |
612 | if (error) | |
613 | goto err_pdev_put; | |
ecdf6ceb DT |
614 | |
615 | error = platform_device_add(pdev); | |
616 | if (error) | |
617 | goto err_pdev_put; | |
618 | ||
619 | error = platform_driver_probe(driver, probe); | |
620 | if (error) | |
621 | goto err_pdev_del; | |
622 | ||
623 | return pdev; | |
624 | ||
625 | err_pdev_del: | |
626 | platform_device_del(pdev); | |
627 | err_pdev_put: | |
628 | platform_device_put(pdev); | |
629 | err_out: | |
630 | return ERR_PTR(error); | |
631 | } | |
632 | EXPORT_SYMBOL_GPL(platform_create_bundle); | |
633 | ||
a0245f7a DB |
634 | /* modalias support enables more hands-off userspace setup: |
635 | * (a) environment variable lets new-style hotplug events work once system is | |
636 | * fully running: "modprobe $MODALIAS" | |
637 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
638 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
639 | */ | |
4a3ad20c GKH |
640 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
641 | char *buf) | |
a0245f7a DB |
642 | { |
643 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 644 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
645 | |
646 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
647 | } | |
648 | ||
649 | static struct device_attribute platform_dev_attrs[] = { | |
650 | __ATTR_RO(modalias), | |
651 | __ATTR_NULL, | |
652 | }; | |
653 | ||
7eff2e7a | 654 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
655 | { |
656 | struct platform_device *pdev = to_platform_device(dev); | |
eca39301 GL |
657 | int rc; |
658 | ||
659 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
07d57a32 | 660 | rc = of_device_uevent_modalias(dev,env); |
eca39301 GL |
661 | if (rc != -ENODEV) |
662 | return rc; | |
a0245f7a | 663 | |
57fee4a5 | 664 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
0a26813c | 665 | pdev->name); |
a0245f7a DB |
666 | return 0; |
667 | } | |
668 | ||
57fee4a5 | 669 | static const struct platform_device_id *platform_match_id( |
831fad2f | 670 | const struct platform_device_id *id, |
57fee4a5 EM |
671 | struct platform_device *pdev) |
672 | { | |
673 | while (id->name[0]) { | |
674 | if (strcmp(pdev->name, id->name) == 0) { | |
675 | pdev->id_entry = id; | |
676 | return id; | |
677 | } | |
678 | id++; | |
679 | } | |
680 | return NULL; | |
681 | } | |
682 | ||
1da177e4 | 683 | /** |
4a3ad20c GKH |
684 | * platform_match - bind platform device to platform driver. |
685 | * @dev: device. | |
686 | * @drv: driver. | |
1da177e4 | 687 | * |
4a3ad20c GKH |
688 | * Platform device IDs are assumed to be encoded like this: |
689 | * "<name><instance>", where <name> is a short description of the type of | |
690 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
691 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
692 | * "<name>". So, extract the <name> from the platform_device structure, | |
693 | * and compare it against the name of the driver. Return whether they match | |
694 | * or not. | |
1da177e4 | 695 | */ |
4a3ad20c | 696 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 697 | { |
71b3e0c1 | 698 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
699 | struct platform_driver *pdrv = to_platform_driver(drv); |
700 | ||
05212157 GL |
701 | /* Attempt an OF style match first */ |
702 | if (of_driver_match_device(dev, drv)) | |
703 | return 1; | |
704 | ||
705 | /* Then try to match against the id table */ | |
57fee4a5 EM |
706 | if (pdrv->id_table) |
707 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 708 | |
57fee4a5 | 709 | /* fall-back to driver name match */ |
1e0b2cf9 | 710 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
711 | } |
712 | ||
25e18499 RW |
713 | #ifdef CONFIG_PM_SLEEP |
714 | ||
715 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 716 | { |
783ea7d4 MD |
717 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
718 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
719 | int ret = 0; |
720 | ||
783ea7d4 MD |
721 | if (dev->driver && pdrv->suspend) |
722 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
723 | |
724 | return ret; | |
725 | } | |
726 | ||
25e18499 | 727 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 728 | { |
783ea7d4 MD |
729 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
730 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
731 | int ret = 0; |
732 | ||
783ea7d4 MD |
733 | if (dev->driver && pdrv->resume) |
734 | ret = pdrv->resume(pdev); | |
9480e307 | 735 | |
1da177e4 LT |
736 | return ret; |
737 | } | |
738 | ||
69c9dd1e | 739 | #endif /* CONFIG_PM_SLEEP */ |
9d730229 | 740 | |
25e18499 RW |
741 | #ifdef CONFIG_SUSPEND |
742 | ||
69c9dd1e | 743 | int platform_pm_suspend(struct device *dev) |
25e18499 RW |
744 | { |
745 | struct device_driver *drv = dev->driver; | |
746 | int ret = 0; | |
747 | ||
adf09493 RW |
748 | if (!drv) |
749 | return 0; | |
750 | ||
751 | if (drv->pm) { | |
25e18499 RW |
752 | if (drv->pm->suspend) |
753 | ret = drv->pm->suspend(dev); | |
754 | } else { | |
755 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
756 | } | |
757 | ||
758 | return ret; | |
759 | } | |
760 | ||
69c9dd1e | 761 | int platform_pm_resume(struct device *dev) |
25e18499 RW |
762 | { |
763 | struct device_driver *drv = dev->driver; | |
764 | int ret = 0; | |
765 | ||
adf09493 RW |
766 | if (!drv) |
767 | return 0; | |
768 | ||
769 | if (drv->pm) { | |
25e18499 RW |
770 | if (drv->pm->resume) |
771 | ret = drv->pm->resume(dev); | |
772 | } else { | |
773 | ret = platform_legacy_resume(dev); | |
774 | } | |
775 | ||
776 | return ret; | |
777 | } | |
778 | ||
69c9dd1e | 779 | #endif /* CONFIG_SUSPEND */ |
25e18499 | 780 | |
1f112cee | 781 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 | 782 | |
69c9dd1e | 783 | int platform_pm_freeze(struct device *dev) |
25e18499 RW |
784 | { |
785 | struct device_driver *drv = dev->driver; | |
786 | int ret = 0; | |
787 | ||
788 | if (!drv) | |
789 | return 0; | |
790 | ||
791 | if (drv->pm) { | |
792 | if (drv->pm->freeze) | |
793 | ret = drv->pm->freeze(dev); | |
794 | } else { | |
795 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
796 | } | |
797 | ||
798 | return ret; | |
799 | } | |
800 | ||
69c9dd1e | 801 | int platform_pm_thaw(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->thaw) |
811 | ret = drv->pm->thaw(dev); | |
812 | } else { | |
813 | ret = platform_legacy_resume(dev); | |
814 | } | |
815 | ||
816 | return ret; | |
817 | } | |
818 | ||
69c9dd1e | 819 | int platform_pm_poweroff(struct device *dev) |
25e18499 RW |
820 | { |
821 | struct device_driver *drv = dev->driver; | |
822 | int ret = 0; | |
823 | ||
adf09493 RW |
824 | if (!drv) |
825 | return 0; | |
826 | ||
827 | if (drv->pm) { | |
25e18499 RW |
828 | if (drv->pm->poweroff) |
829 | ret = drv->pm->poweroff(dev); | |
830 | } else { | |
831 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
832 | } | |
833 | ||
834 | return ret; | |
835 | } | |
836 | ||
69c9dd1e | 837 | int platform_pm_restore(struct device *dev) |
25e18499 RW |
838 | { |
839 | struct device_driver *drv = dev->driver; | |
840 | int ret = 0; | |
841 | ||
adf09493 RW |
842 | if (!drv) |
843 | return 0; | |
844 | ||
845 | if (drv->pm) { | |
25e18499 RW |
846 | if (drv->pm->restore) |
847 | ret = drv->pm->restore(dev); | |
848 | } else { | |
849 | ret = platform_legacy_resume(dev); | |
850 | } | |
851 | ||
852 | return ret; | |
853 | } | |
854 | ||
69c9dd1e | 855 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 856 | |
d9ab7716 | 857 | static const struct dev_pm_ops platform_dev_pm_ops = { |
8b313a38 RW |
858 | .runtime_suspend = pm_generic_runtime_suspend, |
859 | .runtime_resume = pm_generic_runtime_resume, | |
860 | .runtime_idle = pm_generic_runtime_idle, | |
69c9dd1e | 861 | USE_PLATFORM_PM_SLEEP_OPS |
25e18499 RW |
862 | }; |
863 | ||
1da177e4 LT |
864 | struct bus_type platform_bus_type = { |
865 | .name = "platform", | |
a0245f7a | 866 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 867 | .match = platform_match, |
a0245f7a | 868 | .uevent = platform_uevent, |
9d730229 | 869 | .pm = &platform_dev_pm_ops, |
1da177e4 | 870 | }; |
a96b2042 | 871 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
872 | |
873 | int __init platform_bus_init(void) | |
874 | { | |
fbfb1445 CH |
875 | int error; |
876 | ||
13977091 MD |
877 | early_platform_cleanup(); |
878 | ||
fbfb1445 CH |
879 | error = device_register(&platform_bus); |
880 | if (error) | |
881 | return error; | |
882 | error = bus_register(&platform_bus_type); | |
883 | if (error) | |
884 | device_unregister(&platform_bus); | |
885 | return error; | |
1da177e4 LT |
886 | } |
887 | ||
888 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
889 | u64 dma_get_required_mask(struct device *dev) | |
890 | { | |
891 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
892 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
893 | u64 mask; | |
894 | ||
895 | if (!high_totalram) { | |
896 | /* convert to mask just covering totalram */ | |
897 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
898 | low_totalram += low_totalram - 1; | |
899 | mask = low_totalram; | |
900 | } else { | |
901 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
902 | high_totalram += high_totalram - 1; | |
903 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
904 | } | |
e88a0c2c | 905 | return mask; |
1da177e4 LT |
906 | } |
907 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
908 | #endif | |
13977091 MD |
909 | |
910 | static __initdata LIST_HEAD(early_platform_driver_list); | |
911 | static __initdata LIST_HEAD(early_platform_device_list); | |
912 | ||
913 | /** | |
4d26e139 | 914 | * early_platform_driver_register - register early platform driver |
d86c1302 | 915 | * @epdrv: early_platform driver structure |
13977091 | 916 | * @buf: string passed from early_param() |
4d26e139 MD |
917 | * |
918 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
919 | */ |
920 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
921 | char *buf) | |
922 | { | |
c60e0504 | 923 | char *tmp; |
13977091 MD |
924 | int n; |
925 | ||
926 | /* Simply add the driver to the end of the global list. | |
927 | * Drivers will by default be put on the list in compiled-in order. | |
928 | */ | |
929 | if (!epdrv->list.next) { | |
930 | INIT_LIST_HEAD(&epdrv->list); | |
931 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
932 | } | |
933 | ||
934 | /* If the user has specified device then make sure the driver | |
935 | * gets prioritized. The driver of the last device specified on | |
936 | * command line will be put first on the list. | |
937 | */ | |
938 | n = strlen(epdrv->pdrv->driver.name); | |
939 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
940 | list_move(&epdrv->list, &early_platform_driver_list); | |
941 | ||
c60e0504 MD |
942 | /* Allow passing parameters after device name */ |
943 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 944 | epdrv->requested_id = -1; |
c60e0504 MD |
945 | else { |
946 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
947 | &tmp, 10); | |
948 | ||
949 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
950 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
951 | n = 0; | |
952 | } else | |
953 | n += strcspn(&buf[n + 1], ",") + 1; | |
954 | } | |
955 | ||
956 | if (buf[n] == ',') | |
957 | n++; | |
958 | ||
959 | if (epdrv->bufsize) { | |
960 | memcpy(epdrv->buffer, &buf[n], | |
961 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
962 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
963 | } | |
13977091 MD |
964 | } |
965 | ||
966 | return 0; | |
967 | } | |
968 | ||
969 | /** | |
4d26e139 | 970 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
971 | * @devs: array of early platform devices to add |
972 | * @num: number of early platform devices in array | |
4d26e139 MD |
973 | * |
974 | * Used by early architecture code to register early platform devices and | |
975 | * their platform data. | |
13977091 MD |
976 | */ |
977 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
978 | { | |
979 | struct device *dev; | |
980 | int i; | |
981 | ||
982 | /* simply add the devices to list */ | |
983 | for (i = 0; i < num; i++) { | |
984 | dev = &devs[i]->dev; | |
985 | ||
986 | if (!dev->devres_head.next) { | |
bed2b42d | 987 | pm_runtime_early_init(dev); |
13977091 MD |
988 | INIT_LIST_HEAD(&dev->devres_head); |
989 | list_add_tail(&dev->devres_head, | |
990 | &early_platform_device_list); | |
991 | } | |
992 | } | |
993 | } | |
994 | ||
995 | /** | |
4d26e139 | 996 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 997 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
998 | * |
999 | * Used by architecture code to register all early platform drivers | |
1000 | * for a certain class. If omitted then only early platform drivers | |
1001 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
1002 | */ |
1003 | void __init early_platform_driver_register_all(char *class_str) | |
1004 | { | |
1005 | /* The "class_str" parameter may or may not be present on the kernel | |
1006 | * command line. If it is present then there may be more than one | |
1007 | * matching parameter. | |
1008 | * | |
1009 | * Since we register our early platform drivers using early_param() | |
1010 | * we need to make sure that they also get registered in the case | |
1011 | * when the parameter is missing from the kernel command line. | |
1012 | * | |
1013 | * We use parse_early_options() to make sure the early_param() gets | |
1014 | * called at least once. The early_param() may be called more than | |
1015 | * once since the name of the preferred device may be specified on | |
1016 | * the kernel command line. early_platform_driver_register() handles | |
1017 | * this case for us. | |
1018 | */ | |
1019 | parse_early_options(class_str); | |
1020 | } | |
1021 | ||
1022 | /** | |
4d26e139 | 1023 | * early_platform_match - find early platform device matching driver |
d86c1302 | 1024 | * @epdrv: early platform driver structure |
13977091 MD |
1025 | * @id: id to match against |
1026 | */ | |
1027 | static __init struct platform_device * | |
1028 | early_platform_match(struct early_platform_driver *epdrv, int id) | |
1029 | { | |
1030 | struct platform_device *pd; | |
1031 | ||
1032 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1033 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1034 | if (pd->id == id) | |
1035 | return pd; | |
1036 | ||
1037 | return NULL; | |
1038 | } | |
1039 | ||
1040 | /** | |
4d26e139 | 1041 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1042 | * @epdrv: early platform driver structure |
13977091 MD |
1043 | * @id: return true if id or above exists |
1044 | */ | |
1045 | static __init int early_platform_left(struct early_platform_driver *epdrv, | |
1046 | int id) | |
1047 | { | |
1048 | struct platform_device *pd; | |
1049 | ||
1050 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1051 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1052 | if (pd->id >= id) | |
1053 | return 1; | |
1054 | ||
1055 | return 0; | |
1056 | } | |
1057 | ||
1058 | /** | |
4d26e139 | 1059 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1060 | * @class_str: string to identify early platform driver class |
1061 | * @id: id to match against | |
1062 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1063 | */ | |
1064 | static int __init early_platform_driver_probe_id(char *class_str, | |
1065 | int id, | |
1066 | int nr_probe) | |
1067 | { | |
1068 | struct early_platform_driver *epdrv; | |
1069 | struct platform_device *match; | |
1070 | int match_id; | |
1071 | int n = 0; | |
1072 | int left = 0; | |
1073 | ||
1074 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1075 | /* only use drivers matching our class_str */ | |
1076 | if (strcmp(class_str, epdrv->class_str)) | |
1077 | continue; | |
1078 | ||
1079 | if (id == -2) { | |
1080 | match_id = epdrv->requested_id; | |
1081 | left = 1; | |
1082 | ||
1083 | } else { | |
1084 | match_id = id; | |
1085 | left += early_platform_left(epdrv, id); | |
1086 | ||
1087 | /* skip requested id */ | |
1088 | switch (epdrv->requested_id) { | |
1089 | case EARLY_PLATFORM_ID_ERROR: | |
1090 | case EARLY_PLATFORM_ID_UNSET: | |
1091 | break; | |
1092 | default: | |
1093 | if (epdrv->requested_id == id) | |
1094 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1095 | } | |
1096 | } | |
1097 | ||
1098 | switch (match_id) { | |
1099 | case EARLY_PLATFORM_ID_ERROR: | |
1100 | pr_warning("%s: unable to parse %s parameter\n", | |
1101 | class_str, epdrv->pdrv->driver.name); | |
1102 | /* fall-through */ | |
1103 | case EARLY_PLATFORM_ID_UNSET: | |
1104 | match = NULL; | |
1105 | break; | |
1106 | default: | |
1107 | match = early_platform_match(epdrv, match_id); | |
1108 | } | |
1109 | ||
1110 | if (match) { | |
a636ee7f PM |
1111 | /* |
1112 | * Set up a sensible init_name to enable | |
1113 | * dev_name() and others to be used before the | |
1114 | * rest of the driver core is initialized. | |
1115 | */ | |
06fe53be | 1116 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1117 | if (match->id != -1) |
bd05086b PM |
1118 | match->dev.init_name = |
1119 | kasprintf(GFP_KERNEL, "%s.%d", | |
1120 | match->name, | |
1121 | match->id); | |
a636ee7f | 1122 | else |
bd05086b PM |
1123 | match->dev.init_name = |
1124 | kasprintf(GFP_KERNEL, "%s", | |
1125 | match->name); | |
a636ee7f | 1126 | |
a636ee7f PM |
1127 | if (!match->dev.init_name) |
1128 | return -ENOMEM; | |
1129 | } | |
bd05086b | 1130 | |
13977091 MD |
1131 | if (epdrv->pdrv->probe(match)) |
1132 | pr_warning("%s: unable to probe %s early.\n", | |
1133 | class_str, match->name); | |
1134 | else | |
1135 | n++; | |
1136 | } | |
1137 | ||
1138 | if (n >= nr_probe) | |
1139 | break; | |
1140 | } | |
1141 | ||
1142 | if (left) | |
1143 | return n; | |
1144 | else | |
1145 | return -ENODEV; | |
1146 | } | |
1147 | ||
1148 | /** | |
4d26e139 | 1149 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1150 | * @class_str: string to identify early platform driver class |
1151 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1152 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1153 | * |
1154 | * Used by architecture code to probe registered early platform drivers | |
1155 | * within a certain class. For probe to happen a registered early platform | |
1156 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1157 | */ |
1158 | int __init early_platform_driver_probe(char *class_str, | |
1159 | int nr_probe, | |
1160 | int user_only) | |
1161 | { | |
1162 | int k, n, i; | |
1163 | ||
1164 | n = 0; | |
1165 | for (i = -2; n < nr_probe; i++) { | |
1166 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1167 | ||
1168 | if (k < 0) | |
1169 | break; | |
1170 | ||
1171 | n += k; | |
1172 | ||
1173 | if (user_only) | |
1174 | break; | |
1175 | } | |
1176 | ||
1177 | return n; | |
1178 | } | |
1179 | ||
1180 | /** | |
1181 | * early_platform_cleanup - clean up early platform code | |
1182 | */ | |
1183 | void __init early_platform_cleanup(void) | |
1184 | { | |
1185 | struct platform_device *pd, *pd2; | |
1186 | ||
1187 | /* clean up the devres list used to chain devices */ | |
1188 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1189 | dev.devres_head) { | |
1190 | list_del(&pd->dev.devres_head); | |
1191 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1192 | } | |
1193 | } | |
1194 |