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> |
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 | { | |
5cf8f7db AL |
86 | #ifdef CONFIG_SPARC |
87 | /* sparc does not have irqs represented as IORESOURCE_IRQ resources */ | |
88 | if (!dev || num >= dev->archdata.num_irqs) | |
89 | return -ENXIO; | |
90 | return dev->archdata.irqs[num]; | |
91 | #else | |
1da177e4 LT |
92 | struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); |
93 | ||
305b3228 | 94 | return r ? r->start : -ENXIO; |
5cf8f7db | 95 | #endif |
1da177e4 | 96 | } |
a96b2042 | 97 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
98 | |
99 | /** | |
4a3ad20c GKH |
100 | * platform_get_resource_byname - get a resource for a device by name |
101 | * @dev: platform device | |
102 | * @type: resource type | |
103 | * @name: resource name | |
1da177e4 | 104 | */ |
4a3ad20c | 105 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
106 | unsigned int type, |
107 | const char *name) | |
1da177e4 LT |
108 | { |
109 | int i; | |
110 | ||
111 | for (i = 0; i < dev->num_resources; i++) { | |
112 | struct resource *r = &dev->resource[i]; | |
113 | ||
1b8cb929 PU |
114 | if (unlikely(!r->name)) |
115 | continue; | |
116 | ||
c9f66169 MD |
117 | if (type == resource_type(r) && !strcmp(r->name, name)) |
118 | return r; | |
1da177e4 LT |
119 | } |
120 | return NULL; | |
121 | } | |
a96b2042 | 122 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
123 | |
124 | /** | |
4a3ad20c GKH |
125 | * platform_get_irq - get an IRQ for a device |
126 | * @dev: platform device | |
127 | * @name: IRQ name | |
1da177e4 | 128 | */ |
c0afe7ba | 129 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
1da177e4 | 130 | { |
4a3ad20c GKH |
131 | struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, |
132 | name); | |
1da177e4 | 133 | |
305b3228 | 134 | return r ? r->start : -ENXIO; |
1da177e4 | 135 | } |
a96b2042 | 136 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
137 | |
138 | /** | |
4a3ad20c GKH |
139 | * platform_add_devices - add a numbers of platform devices |
140 | * @devs: array of platform devices to add | |
141 | * @num: number of platform devices in array | |
1da177e4 LT |
142 | */ |
143 | int platform_add_devices(struct platform_device **devs, int num) | |
144 | { | |
145 | int i, ret = 0; | |
146 | ||
147 | for (i = 0; i < num; i++) { | |
148 | ret = platform_device_register(devs[i]); | |
149 | if (ret) { | |
150 | while (--i >= 0) | |
151 | platform_device_unregister(devs[i]); | |
152 | break; | |
153 | } | |
154 | } | |
155 | ||
156 | return ret; | |
157 | } | |
a96b2042 | 158 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 159 | |
37c12e74 RK |
160 | struct platform_object { |
161 | struct platform_device pdev; | |
162 | char name[1]; | |
163 | }; | |
164 | ||
1da177e4 | 165 | /** |
3c31f07a | 166 | * platform_device_put - destroy a platform device |
4a3ad20c | 167 | * @pdev: platform device to free |
37c12e74 | 168 | * |
4a3ad20c GKH |
169 | * Free all memory associated with a platform device. This function must |
170 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
171 | */ |
172 | void platform_device_put(struct platform_device *pdev) | |
173 | { | |
174 | if (pdev) | |
175 | put_device(&pdev->dev); | |
176 | } | |
177 | EXPORT_SYMBOL_GPL(platform_device_put); | |
178 | ||
179 | static void platform_device_release(struct device *dev) | |
180 | { | |
4a3ad20c GKH |
181 | struct platform_object *pa = container_of(dev, struct platform_object, |
182 | pdev.dev); | |
37c12e74 | 183 | |
7096d042 | 184 | of_device_node_put(&pa->pdev.dev); |
37c12e74 | 185 | kfree(pa->pdev.dev.platform_data); |
e710d7d5 | 186 | kfree(pa->pdev.mfd_cell); |
37c12e74 RK |
187 | kfree(pa->pdev.resource); |
188 | kfree(pa); | |
189 | } | |
190 | ||
191 | /** | |
3c31f07a | 192 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
193 | * @name: base name of the device we're adding |
194 | * @id: instance id | |
37c12e74 | 195 | * |
4a3ad20c GKH |
196 | * Create a platform device object which can have other objects attached |
197 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 198 | */ |
1359555e | 199 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
200 | { |
201 | struct platform_object *pa; | |
202 | ||
203 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); | |
204 | if (pa) { | |
205 | strcpy(pa->name, name); | |
206 | pa->pdev.name = pa->name; | |
207 | pa->pdev.id = id; | |
208 | device_initialize(&pa->pdev.dev); | |
209 | pa->pdev.dev.release = platform_device_release; | |
a77ce816 | 210 | arch_setup_pdev_archdata(&pa->pdev); |
37c12e74 RK |
211 | } |
212 | ||
93ce3061 | 213 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
214 | } |
215 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
216 | ||
217 | /** | |
3c31f07a | 218 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
219 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
220 | * @res: set of resources that needs to be allocated for the device | |
221 | * @num: number of resources | |
37c12e74 | 222 | * |
4a3ad20c GKH |
223 | * Add a copy of the resources to the platform device. The memory |
224 | * associated with the resources will be freed when the platform device is | |
225 | * released. | |
37c12e74 | 226 | */ |
4a3ad20c | 227 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 228 | const struct resource *res, unsigned int num) |
37c12e74 | 229 | { |
cea89623 | 230 | struct resource *r = NULL; |
37c12e74 | 231 | |
cea89623 UKK |
232 | if (res) { |
233 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); | |
234 | if (!r) | |
235 | return -ENOMEM; | |
37c12e74 | 236 | } |
cea89623 | 237 | |
4a03d6f7 | 238 | kfree(pdev->resource); |
cea89623 UKK |
239 | pdev->resource = r; |
240 | pdev->num_resources = num; | |
241 | return 0; | |
37c12e74 RK |
242 | } |
243 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
244 | ||
245 | /** | |
3c31f07a | 246 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
247 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
248 | * @data: platform specific data for this platform device | |
249 | * @size: size of platform specific data | |
37c12e74 | 250 | * |
4a3ad20c GKH |
251 | * Add a copy of platform specific data to the platform device's |
252 | * platform_data pointer. The memory associated with the platform data | |
253 | * will be freed when the platform device is released. | |
37c12e74 | 254 | */ |
4a3ad20c GKH |
255 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
256 | size_t size) | |
37c12e74 | 257 | { |
27a33f9e | 258 | void *d = NULL; |
5cfc64ce | 259 | |
27a33f9e UKK |
260 | if (data) { |
261 | d = kmemdup(data, size, GFP_KERNEL); | |
262 | if (!d) | |
263 | return -ENOMEM; | |
37c12e74 | 264 | } |
27a33f9e | 265 | |
251e031d | 266 | kfree(pdev->dev.platform_data); |
27a33f9e UKK |
267 | pdev->dev.platform_data = d; |
268 | return 0; | |
37c12e74 RK |
269 | } |
270 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
271 | ||
272 | /** | |
4a3ad20c GKH |
273 | * platform_device_add - add a platform device to device hierarchy |
274 | * @pdev: platform device we're adding | |
1da177e4 | 275 | * |
4a3ad20c GKH |
276 | * This is part 2 of platform_device_register(), though may be called |
277 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 278 | */ |
37c12e74 | 279 | int platform_device_add(struct platform_device *pdev) |
1da177e4 | 280 | { |
689ae231 | 281 | int i, ret; |
1da177e4 LT |
282 | |
283 | if (!pdev) | |
284 | return -EINVAL; | |
285 | ||
286 | if (!pdev->dev.parent) | |
287 | pdev->dev.parent = &platform_bus; | |
288 | ||
289 | pdev->dev.bus = &platform_bus_type; | |
290 | ||
689ae231 JD |
291 | switch (pdev->id) { |
292 | default: | |
1e0b2cf9 | 293 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
689ae231 JD |
294 | break; |
295 | case PLATFORM_DEVID_NONE: | |
acc0e90f | 296 | dev_set_name(&pdev->dev, "%s", pdev->name); |
689ae231 JD |
297 | break; |
298 | case PLATFORM_DEVID_AUTO: | |
299 | /* | |
300 | * Automatically allocated device ID. We mark it as such so | |
301 | * that we remember it must be freed, and we append a suffix | |
302 | * to avoid namespace collision with explicit IDs. | |
303 | */ | |
304 | ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL); | |
305 | if (ret < 0) | |
306 | goto err_out; | |
307 | pdev->id = ret; | |
308 | pdev->id_auto = true; | |
309 | dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); | |
310 | break; | |
311 | } | |
1da177e4 LT |
312 | |
313 | for (i = 0; i < pdev->num_resources; i++) { | |
314 | struct resource *p, *r = &pdev->resource[i]; | |
315 | ||
316 | if (r->name == NULL) | |
1e0b2cf9 | 317 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
318 | |
319 | p = r->parent; | |
320 | if (!p) { | |
c9f66169 | 321 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 322 | p = &iomem_resource; |
c9f66169 | 323 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
324 | p = &ioport_resource; |
325 | } | |
326 | ||
d960bb4d | 327 | if (p && insert_resource(p, r)) { |
1da177e4 LT |
328 | printk(KERN_ERR |
329 | "%s: failed to claim resource %d\n", | |
1e0b2cf9 | 330 | dev_name(&pdev->dev), i); |
1da177e4 LT |
331 | ret = -EBUSY; |
332 | goto failed; | |
333 | } | |
334 | } | |
335 | ||
336 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 337 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 338 | |
e3915532 | 339 | ret = device_add(&pdev->dev); |
1da177e4 LT |
340 | if (ret == 0) |
341 | return ret; | |
342 | ||
343 | failed: | |
689ae231 JD |
344 | if (pdev->id_auto) { |
345 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
346 | pdev->id = PLATFORM_DEVID_AUTO; | |
347 | } | |
348 | ||
c9f66169 MD |
349 | while (--i >= 0) { |
350 | struct resource *r = &pdev->resource[i]; | |
351 | unsigned long type = resource_type(r); | |
352 | ||
353 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
354 | release_resource(r); | |
355 | } | |
356 | ||
689ae231 | 357 | err_out: |
1da177e4 LT |
358 | return ret; |
359 | } | |
37c12e74 RK |
360 | EXPORT_SYMBOL_GPL(platform_device_add); |
361 | ||
362 | /** | |
4a3ad20c GKH |
363 | * platform_device_del - remove a platform-level device |
364 | * @pdev: platform device we're removing | |
1da177e4 | 365 | * |
4a3ad20c GKH |
366 | * Note that this function will also release all memory- and port-based |
367 | * resources owned by the device (@dev->resource). This function must | |
368 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 369 | */ |
93ce3061 | 370 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
371 | { |
372 | int i; | |
373 | ||
374 | if (pdev) { | |
dc4c15d4 JD |
375 | device_del(&pdev->dev); |
376 | ||
689ae231 JD |
377 | if (pdev->id_auto) { |
378 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
379 | pdev->id = PLATFORM_DEVID_AUTO; | |
380 | } | |
381 | ||
1da177e4 LT |
382 | for (i = 0; i < pdev->num_resources; i++) { |
383 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
384 | unsigned long type = resource_type(r); |
385 | ||
386 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
387 | release_resource(r); |
388 | } | |
1da177e4 LT |
389 | } |
390 | } | |
93ce3061 DT |
391 | EXPORT_SYMBOL_GPL(platform_device_del); |
392 | ||
393 | /** | |
4a3ad20c GKH |
394 | * platform_device_register - add a platform-level device |
395 | * @pdev: platform device we're adding | |
93ce3061 | 396 | */ |
4a3ad20c | 397 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
398 | { |
399 | device_initialize(&pdev->dev); | |
a77ce816 | 400 | arch_setup_pdev_archdata(pdev); |
93ce3061 DT |
401 | return platform_device_add(pdev); |
402 | } | |
a96b2042 | 403 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
404 | |
405 | /** | |
4a3ad20c GKH |
406 | * platform_device_unregister - unregister a platform-level device |
407 | * @pdev: platform device we're unregistering | |
93ce3061 | 408 | * |
4a3ad20c GKH |
409 | * Unregistration is done in 2 steps. First we release all resources |
410 | * and remove it from the subsystem, then we drop reference count by | |
411 | * calling platform_device_put(). | |
93ce3061 | 412 | */ |
4a3ad20c | 413 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
414 | { |
415 | platform_device_del(pdev); | |
416 | platform_device_put(pdev); | |
417 | } | |
a96b2042 | 418 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 419 | |
1da177e4 | 420 | /** |
01dcc60a | 421 | * platform_device_register_full - add a platform-level device with |
44f28bde | 422 | * resources and platform-specific data |
49a4ec18 | 423 | * |
01dcc60a | 424 | * @pdevinfo: data used to create device |
d8bf2540 | 425 | * |
f0eae0ed | 426 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 427 | */ |
01dcc60a | 428 | struct platform_device *platform_device_register_full( |
5a3072be | 429 | const struct platform_device_info *pdevinfo) |
d8bf2540 | 430 | { |
44f28bde | 431 | int ret = -ENOMEM; |
d8bf2540 | 432 | struct platform_device *pdev; |
d8bf2540 | 433 | |
01dcc60a | 434 | pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
44f28bde | 435 | if (!pdev) |
01dcc60a UKK |
436 | goto err_alloc; |
437 | ||
438 | pdev->dev.parent = pdevinfo->parent; | |
439 | ||
440 | if (pdevinfo->dma_mask) { | |
441 | /* | |
442 | * This memory isn't freed when the device is put, | |
443 | * I don't have a nice idea for that though. Conceptually | |
444 | * dma_mask in struct device should not be a pointer. | |
445 | * See http://thread.gmane.org/gmane.linux.kernel.pci/9081 | |
446 | */ | |
447 | pdev->dev.dma_mask = | |
448 | kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); | |
449 | if (!pdev->dev.dma_mask) | |
450 | goto err; | |
451 | ||
452 | *pdev->dev.dma_mask = pdevinfo->dma_mask; | |
453 | pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; | |
454 | } | |
d8bf2540 | 455 | |
01dcc60a UKK |
456 | ret = platform_device_add_resources(pdev, |
457 | pdevinfo->res, pdevinfo->num_res); | |
807508c8 AV |
458 | if (ret) |
459 | goto err; | |
44f28bde | 460 | |
01dcc60a UKK |
461 | ret = platform_device_add_data(pdev, |
462 | pdevinfo->data, pdevinfo->size_data); | |
807508c8 AV |
463 | if (ret) |
464 | goto err; | |
d8bf2540 | 465 | |
44f28bde UKK |
466 | ret = platform_device_add(pdev); |
467 | if (ret) { | |
468 | err: | |
01dcc60a UKK |
469 | kfree(pdev->dev.dma_mask); |
470 | ||
471 | err_alloc: | |
44f28bde UKK |
472 | platform_device_put(pdev); |
473 | return ERR_PTR(ret); | |
474 | } | |
d8bf2540 DB |
475 | |
476 | return pdev; | |
d8bf2540 | 477 | } |
01dcc60a | 478 | EXPORT_SYMBOL_GPL(platform_device_register_full); |
d8bf2540 | 479 | |
00d3dcdd RK |
480 | static int platform_drv_probe(struct device *_dev) |
481 | { | |
482 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
483 | struct platform_device *dev = to_platform_device(_dev); | |
484 | ||
485 | return drv->probe(dev); | |
486 | } | |
487 | ||
c67334fb DB |
488 | static int platform_drv_probe_fail(struct device *_dev) |
489 | { | |
490 | return -ENXIO; | |
491 | } | |
492 | ||
00d3dcdd RK |
493 | static int platform_drv_remove(struct device *_dev) |
494 | { | |
495 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
496 | struct platform_device *dev = to_platform_device(_dev); | |
497 | ||
498 | return drv->remove(dev); | |
499 | } | |
500 | ||
501 | static void platform_drv_shutdown(struct device *_dev) | |
502 | { | |
503 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
504 | struct platform_device *dev = to_platform_device(_dev); | |
505 | ||
506 | drv->shutdown(dev); | |
507 | } | |
508 | ||
00d3dcdd | 509 | /** |
3c31f07a | 510 | * platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 511 | * @drv: platform driver structure |
00d3dcdd RK |
512 | */ |
513 | int platform_driver_register(struct platform_driver *drv) | |
514 | { | |
515 | drv->driver.bus = &platform_bus_type; | |
516 | if (drv->probe) | |
517 | drv->driver.probe = platform_drv_probe; | |
518 | if (drv->remove) | |
519 | drv->driver.remove = platform_drv_remove; | |
520 | if (drv->shutdown) | |
521 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 522 | |
00d3dcdd RK |
523 | return driver_register(&drv->driver); |
524 | } | |
525 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
526 | ||
527 | /** | |
3c31f07a | 528 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 529 | * @drv: platform driver structure |
00d3dcdd RK |
530 | */ |
531 | void platform_driver_unregister(struct platform_driver *drv) | |
532 | { | |
533 | driver_unregister(&drv->driver); | |
534 | } | |
535 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
536 | ||
c67334fb DB |
537 | /** |
538 | * platform_driver_probe - register driver for non-hotpluggable device | |
539 | * @drv: platform driver structure | |
540 | * @probe: the driver probe routine, probably from an __init section | |
541 | * | |
542 | * Use this instead of platform_driver_register() when you know the device | |
543 | * is not hotpluggable and has already been registered, and you want to | |
544 | * remove its run-once probe() infrastructure from memory after the driver | |
545 | * has bound to the device. | |
546 | * | |
547 | * One typical use for this would be with drivers for controllers integrated | |
548 | * into system-on-chip processors, where the controller devices have been | |
549 | * configured as part of board setup. | |
550 | * | |
551 | * Returns zero if the driver registered and bound to a device, else returns | |
552 | * a negative error code and with the driver not registered. | |
553 | */ | |
c63e0783 | 554 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
555 | int (*probe)(struct platform_device *)) |
556 | { | |
557 | int retval, code; | |
558 | ||
1a6f2a75 DT |
559 | /* make sure driver won't have bind/unbind attributes */ |
560 | drv->driver.suppress_bind_attrs = true; | |
561 | ||
c67334fb DB |
562 | /* temporary section violation during probe() */ |
563 | drv->probe = probe; | |
564 | retval = code = platform_driver_register(drv); | |
565 | ||
1a6f2a75 DT |
566 | /* |
567 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
568 | * the list of drivers in order to probe new devices. Check to see |
569 | * if the probe was successful, and make sure any forced probes of | |
570 | * new devices fail. | |
571 | */ | |
d79d3244 | 572 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb | 573 | drv->probe = NULL; |
e5dd1278 | 574 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
575 | retval = -ENODEV; |
576 | drv->driver.probe = platform_drv_probe_fail; | |
d79d3244 | 577 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
578 | |
579 | if (code != retval) | |
580 | platform_driver_unregister(drv); | |
581 | return retval; | |
582 | } | |
583 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 584 | |
ecdf6ceb DT |
585 | /** |
586 | * platform_create_bundle - register driver and create corresponding device | |
587 | * @driver: platform driver structure | |
588 | * @probe: the driver probe routine, probably from an __init section | |
589 | * @res: set of resources that needs to be allocated for the device | |
590 | * @n_res: number of resources | |
591 | * @data: platform specific data for this platform device | |
592 | * @size: size of platform specific data | |
593 | * | |
594 | * Use this in legacy-style modules that probe hardware directly and | |
595 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
596 | * |
597 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb DT |
598 | */ |
599 | struct platform_device * __init_or_module platform_create_bundle( | |
600 | struct platform_driver *driver, | |
601 | int (*probe)(struct platform_device *), | |
602 | struct resource *res, unsigned int n_res, | |
603 | const void *data, size_t size) | |
604 | { | |
605 | struct platform_device *pdev; | |
606 | int error; | |
607 | ||
608 | pdev = platform_device_alloc(driver->driver.name, -1); | |
609 | if (!pdev) { | |
610 | error = -ENOMEM; | |
611 | goto err_out; | |
612 | } | |
613 | ||
807508c8 AV |
614 | error = platform_device_add_resources(pdev, res, n_res); |
615 | if (error) | |
616 | goto err_pdev_put; | |
ecdf6ceb | 617 | |
807508c8 AV |
618 | error = platform_device_add_data(pdev, data, size); |
619 | if (error) | |
620 | goto err_pdev_put; | |
ecdf6ceb DT |
621 | |
622 | error = platform_device_add(pdev); | |
623 | if (error) | |
624 | goto err_pdev_put; | |
625 | ||
626 | error = platform_driver_probe(driver, probe); | |
627 | if (error) | |
628 | goto err_pdev_del; | |
629 | ||
630 | return pdev; | |
631 | ||
632 | err_pdev_del: | |
633 | platform_device_del(pdev); | |
634 | err_pdev_put: | |
635 | platform_device_put(pdev); | |
636 | err_out: | |
637 | return ERR_PTR(error); | |
638 | } | |
639 | EXPORT_SYMBOL_GPL(platform_create_bundle); | |
640 | ||
a0245f7a DB |
641 | /* modalias support enables more hands-off userspace setup: |
642 | * (a) environment variable lets new-style hotplug events work once system is | |
643 | * fully running: "modprobe $MODALIAS" | |
644 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
645 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
646 | */ | |
4a3ad20c GKH |
647 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
648 | char *buf) | |
a0245f7a DB |
649 | { |
650 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 651 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
652 | |
653 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
654 | } | |
655 | ||
656 | static struct device_attribute platform_dev_attrs[] = { | |
657 | __ATTR_RO(modalias), | |
658 | __ATTR_NULL, | |
659 | }; | |
660 | ||
7eff2e7a | 661 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
662 | { |
663 | struct platform_device *pdev = to_platform_device(dev); | |
eca39301 GL |
664 | int rc; |
665 | ||
666 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
07d57a32 | 667 | rc = of_device_uevent_modalias(dev,env); |
eca39301 GL |
668 | if (rc != -ENODEV) |
669 | return rc; | |
a0245f7a | 670 | |
57fee4a5 | 671 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
0a26813c | 672 | pdev->name); |
a0245f7a DB |
673 | return 0; |
674 | } | |
675 | ||
57fee4a5 | 676 | static const struct platform_device_id *platform_match_id( |
831fad2f | 677 | const struct platform_device_id *id, |
57fee4a5 EM |
678 | struct platform_device *pdev) |
679 | { | |
680 | while (id->name[0]) { | |
681 | if (strcmp(pdev->name, id->name) == 0) { | |
682 | pdev->id_entry = id; | |
683 | return id; | |
684 | } | |
685 | id++; | |
686 | } | |
687 | return NULL; | |
688 | } | |
689 | ||
1da177e4 | 690 | /** |
4a3ad20c GKH |
691 | * platform_match - bind platform device to platform driver. |
692 | * @dev: device. | |
693 | * @drv: driver. | |
1da177e4 | 694 | * |
4a3ad20c GKH |
695 | * Platform device IDs are assumed to be encoded like this: |
696 | * "<name><instance>", where <name> is a short description of the type of | |
697 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
698 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
699 | * "<name>". So, extract the <name> from the platform_device structure, | |
700 | * and compare it against the name of the driver. Return whether they match | |
701 | * or not. | |
1da177e4 | 702 | */ |
4a3ad20c | 703 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 704 | { |
71b3e0c1 | 705 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
706 | struct platform_driver *pdrv = to_platform_driver(drv); |
707 | ||
05212157 GL |
708 | /* Attempt an OF style match first */ |
709 | if (of_driver_match_device(dev, drv)) | |
710 | return 1; | |
711 | ||
712 | /* Then try to match against the id table */ | |
57fee4a5 EM |
713 | if (pdrv->id_table) |
714 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 715 | |
57fee4a5 | 716 | /* fall-back to driver name match */ |
1e0b2cf9 | 717 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
718 | } |
719 | ||
25e18499 RW |
720 | #ifdef CONFIG_PM_SLEEP |
721 | ||
722 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 723 | { |
783ea7d4 MD |
724 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
725 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
726 | int ret = 0; |
727 | ||
783ea7d4 MD |
728 | if (dev->driver && pdrv->suspend) |
729 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
730 | |
731 | return ret; | |
732 | } | |
733 | ||
25e18499 | 734 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 735 | { |
783ea7d4 MD |
736 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
737 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
738 | int ret = 0; |
739 | ||
783ea7d4 MD |
740 | if (dev->driver && pdrv->resume) |
741 | ret = pdrv->resume(pdev); | |
9480e307 | 742 | |
1da177e4 LT |
743 | return ret; |
744 | } | |
745 | ||
69c9dd1e | 746 | #endif /* CONFIG_PM_SLEEP */ |
9d730229 | 747 | |
25e18499 RW |
748 | #ifdef CONFIG_SUSPEND |
749 | ||
69c9dd1e | 750 | int platform_pm_suspend(struct device *dev) |
25e18499 RW |
751 | { |
752 | struct device_driver *drv = dev->driver; | |
753 | int ret = 0; | |
754 | ||
adf09493 RW |
755 | if (!drv) |
756 | return 0; | |
757 | ||
758 | if (drv->pm) { | |
25e18499 RW |
759 | if (drv->pm->suspend) |
760 | ret = drv->pm->suspend(dev); | |
761 | } else { | |
762 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
763 | } | |
764 | ||
765 | return ret; | |
766 | } | |
767 | ||
69c9dd1e | 768 | int platform_pm_resume(struct device *dev) |
25e18499 RW |
769 | { |
770 | struct device_driver *drv = dev->driver; | |
771 | int ret = 0; | |
772 | ||
adf09493 RW |
773 | if (!drv) |
774 | return 0; | |
775 | ||
776 | if (drv->pm) { | |
25e18499 RW |
777 | if (drv->pm->resume) |
778 | ret = drv->pm->resume(dev); | |
779 | } else { | |
780 | ret = platform_legacy_resume(dev); | |
781 | } | |
782 | ||
783 | return ret; | |
784 | } | |
785 | ||
69c9dd1e | 786 | #endif /* CONFIG_SUSPEND */ |
25e18499 | 787 | |
1f112cee | 788 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 | 789 | |
69c9dd1e | 790 | int platform_pm_freeze(struct device *dev) |
25e18499 RW |
791 | { |
792 | struct device_driver *drv = dev->driver; | |
793 | int ret = 0; | |
794 | ||
795 | if (!drv) | |
796 | return 0; | |
797 | ||
798 | if (drv->pm) { | |
799 | if (drv->pm->freeze) | |
800 | ret = drv->pm->freeze(dev); | |
801 | } else { | |
802 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
803 | } | |
804 | ||
805 | return ret; | |
806 | } | |
807 | ||
69c9dd1e | 808 | int platform_pm_thaw(struct device *dev) |
25e18499 RW |
809 | { |
810 | struct device_driver *drv = dev->driver; | |
811 | int ret = 0; | |
812 | ||
adf09493 RW |
813 | if (!drv) |
814 | return 0; | |
815 | ||
816 | if (drv->pm) { | |
25e18499 RW |
817 | if (drv->pm->thaw) |
818 | ret = drv->pm->thaw(dev); | |
819 | } else { | |
820 | ret = platform_legacy_resume(dev); | |
821 | } | |
822 | ||
823 | return ret; | |
824 | } | |
825 | ||
69c9dd1e | 826 | int platform_pm_poweroff(struct device *dev) |
25e18499 RW |
827 | { |
828 | struct device_driver *drv = dev->driver; | |
829 | int ret = 0; | |
830 | ||
adf09493 RW |
831 | if (!drv) |
832 | return 0; | |
833 | ||
834 | if (drv->pm) { | |
25e18499 RW |
835 | if (drv->pm->poweroff) |
836 | ret = drv->pm->poweroff(dev); | |
837 | } else { | |
838 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
839 | } | |
840 | ||
841 | return ret; | |
842 | } | |
843 | ||
69c9dd1e | 844 | int platform_pm_restore(struct device *dev) |
25e18499 RW |
845 | { |
846 | struct device_driver *drv = dev->driver; | |
847 | int ret = 0; | |
848 | ||
adf09493 RW |
849 | if (!drv) |
850 | return 0; | |
851 | ||
852 | if (drv->pm) { | |
25e18499 RW |
853 | if (drv->pm->restore) |
854 | ret = drv->pm->restore(dev); | |
855 | } else { | |
856 | ret = platform_legacy_resume(dev); | |
857 | } | |
858 | ||
859 | return ret; | |
860 | } | |
861 | ||
69c9dd1e | 862 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 863 | |
d9ab7716 | 864 | static const struct dev_pm_ops platform_dev_pm_ops = { |
8b313a38 RW |
865 | .runtime_suspend = pm_generic_runtime_suspend, |
866 | .runtime_resume = pm_generic_runtime_resume, | |
867 | .runtime_idle = pm_generic_runtime_idle, | |
69c9dd1e | 868 | USE_PLATFORM_PM_SLEEP_OPS |
25e18499 RW |
869 | }; |
870 | ||
1da177e4 LT |
871 | struct bus_type platform_bus_type = { |
872 | .name = "platform", | |
a0245f7a | 873 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 874 | .match = platform_match, |
a0245f7a | 875 | .uevent = platform_uevent, |
9d730229 | 876 | .pm = &platform_dev_pm_ops, |
1da177e4 | 877 | }; |
a96b2042 | 878 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
879 | |
880 | int __init platform_bus_init(void) | |
881 | { | |
fbfb1445 CH |
882 | int error; |
883 | ||
13977091 MD |
884 | early_platform_cleanup(); |
885 | ||
fbfb1445 CH |
886 | error = device_register(&platform_bus); |
887 | if (error) | |
888 | return error; | |
889 | error = bus_register(&platform_bus_type); | |
890 | if (error) | |
891 | device_unregister(&platform_bus); | |
892 | return error; | |
1da177e4 LT |
893 | } |
894 | ||
895 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
896 | u64 dma_get_required_mask(struct device *dev) | |
897 | { | |
898 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
899 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
900 | u64 mask; | |
901 | ||
902 | if (!high_totalram) { | |
903 | /* convert to mask just covering totalram */ | |
904 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
905 | low_totalram += low_totalram - 1; | |
906 | mask = low_totalram; | |
907 | } else { | |
908 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
909 | high_totalram += high_totalram - 1; | |
910 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
911 | } | |
e88a0c2c | 912 | return mask; |
1da177e4 LT |
913 | } |
914 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
915 | #endif | |
13977091 MD |
916 | |
917 | static __initdata LIST_HEAD(early_platform_driver_list); | |
918 | static __initdata LIST_HEAD(early_platform_device_list); | |
919 | ||
920 | /** | |
4d26e139 | 921 | * early_platform_driver_register - register early platform driver |
d86c1302 | 922 | * @epdrv: early_platform driver structure |
13977091 | 923 | * @buf: string passed from early_param() |
4d26e139 MD |
924 | * |
925 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
926 | */ |
927 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
928 | char *buf) | |
929 | { | |
c60e0504 | 930 | char *tmp; |
13977091 MD |
931 | int n; |
932 | ||
933 | /* Simply add the driver to the end of the global list. | |
934 | * Drivers will by default be put on the list in compiled-in order. | |
935 | */ | |
936 | if (!epdrv->list.next) { | |
937 | INIT_LIST_HEAD(&epdrv->list); | |
938 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
939 | } | |
940 | ||
941 | /* If the user has specified device then make sure the driver | |
942 | * gets prioritized. The driver of the last device specified on | |
943 | * command line will be put first on the list. | |
944 | */ | |
945 | n = strlen(epdrv->pdrv->driver.name); | |
946 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
947 | list_move(&epdrv->list, &early_platform_driver_list); | |
948 | ||
c60e0504 MD |
949 | /* Allow passing parameters after device name */ |
950 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 951 | epdrv->requested_id = -1; |
c60e0504 MD |
952 | else { |
953 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
954 | &tmp, 10); | |
955 | ||
956 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
957 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
958 | n = 0; | |
959 | } else | |
960 | n += strcspn(&buf[n + 1], ",") + 1; | |
961 | } | |
962 | ||
963 | if (buf[n] == ',') | |
964 | n++; | |
965 | ||
966 | if (epdrv->bufsize) { | |
967 | memcpy(epdrv->buffer, &buf[n], | |
968 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
969 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
970 | } | |
13977091 MD |
971 | } |
972 | ||
973 | return 0; | |
974 | } | |
975 | ||
976 | /** | |
4d26e139 | 977 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
978 | * @devs: array of early platform devices to add |
979 | * @num: number of early platform devices in array | |
4d26e139 MD |
980 | * |
981 | * Used by early architecture code to register early platform devices and | |
982 | * their platform data. | |
13977091 MD |
983 | */ |
984 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
985 | { | |
986 | struct device *dev; | |
987 | int i; | |
988 | ||
989 | /* simply add the devices to list */ | |
990 | for (i = 0; i < num; i++) { | |
991 | dev = &devs[i]->dev; | |
992 | ||
993 | if (!dev->devres_head.next) { | |
bed2b42d | 994 | pm_runtime_early_init(dev); |
13977091 MD |
995 | INIT_LIST_HEAD(&dev->devres_head); |
996 | list_add_tail(&dev->devres_head, | |
997 | &early_platform_device_list); | |
998 | } | |
999 | } | |
1000 | } | |
1001 | ||
1002 | /** | |
4d26e139 | 1003 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 1004 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
1005 | * |
1006 | * Used by architecture code to register all early platform drivers | |
1007 | * for a certain class. If omitted then only early platform drivers | |
1008 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
1009 | */ |
1010 | void __init early_platform_driver_register_all(char *class_str) | |
1011 | { | |
1012 | /* The "class_str" parameter may or may not be present on the kernel | |
1013 | * command line. If it is present then there may be more than one | |
1014 | * matching parameter. | |
1015 | * | |
1016 | * Since we register our early platform drivers using early_param() | |
1017 | * we need to make sure that they also get registered in the case | |
1018 | * when the parameter is missing from the kernel command line. | |
1019 | * | |
1020 | * We use parse_early_options() to make sure the early_param() gets | |
1021 | * called at least once. The early_param() may be called more than | |
1022 | * once since the name of the preferred device may be specified on | |
1023 | * the kernel command line. early_platform_driver_register() handles | |
1024 | * this case for us. | |
1025 | */ | |
1026 | parse_early_options(class_str); | |
1027 | } | |
1028 | ||
1029 | /** | |
4d26e139 | 1030 | * early_platform_match - find early platform device matching driver |
d86c1302 | 1031 | * @epdrv: early platform driver structure |
13977091 MD |
1032 | * @id: id to match against |
1033 | */ | |
1034 | static __init struct platform_device * | |
1035 | early_platform_match(struct early_platform_driver *epdrv, int id) | |
1036 | { | |
1037 | struct platform_device *pd; | |
1038 | ||
1039 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1040 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1041 | if (pd->id == id) | |
1042 | return pd; | |
1043 | ||
1044 | return NULL; | |
1045 | } | |
1046 | ||
1047 | /** | |
4d26e139 | 1048 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1049 | * @epdrv: early platform driver structure |
13977091 MD |
1050 | * @id: return true if id or above exists |
1051 | */ | |
1052 | static __init int early_platform_left(struct early_platform_driver *epdrv, | |
1053 | int id) | |
1054 | { | |
1055 | struct platform_device *pd; | |
1056 | ||
1057 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1058 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1059 | if (pd->id >= id) | |
1060 | return 1; | |
1061 | ||
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | /** | |
4d26e139 | 1066 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1067 | * @class_str: string to identify early platform driver class |
1068 | * @id: id to match against | |
1069 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1070 | */ | |
1071 | static int __init early_platform_driver_probe_id(char *class_str, | |
1072 | int id, | |
1073 | int nr_probe) | |
1074 | { | |
1075 | struct early_platform_driver *epdrv; | |
1076 | struct platform_device *match; | |
1077 | int match_id; | |
1078 | int n = 0; | |
1079 | int left = 0; | |
1080 | ||
1081 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1082 | /* only use drivers matching our class_str */ | |
1083 | if (strcmp(class_str, epdrv->class_str)) | |
1084 | continue; | |
1085 | ||
1086 | if (id == -2) { | |
1087 | match_id = epdrv->requested_id; | |
1088 | left = 1; | |
1089 | ||
1090 | } else { | |
1091 | match_id = id; | |
1092 | left += early_platform_left(epdrv, id); | |
1093 | ||
1094 | /* skip requested id */ | |
1095 | switch (epdrv->requested_id) { | |
1096 | case EARLY_PLATFORM_ID_ERROR: | |
1097 | case EARLY_PLATFORM_ID_UNSET: | |
1098 | break; | |
1099 | default: | |
1100 | if (epdrv->requested_id == id) | |
1101 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | switch (match_id) { | |
1106 | case EARLY_PLATFORM_ID_ERROR: | |
1107 | pr_warning("%s: unable to parse %s parameter\n", | |
1108 | class_str, epdrv->pdrv->driver.name); | |
1109 | /* fall-through */ | |
1110 | case EARLY_PLATFORM_ID_UNSET: | |
1111 | match = NULL; | |
1112 | break; | |
1113 | default: | |
1114 | match = early_platform_match(epdrv, match_id); | |
1115 | } | |
1116 | ||
1117 | if (match) { | |
a636ee7f PM |
1118 | /* |
1119 | * Set up a sensible init_name to enable | |
1120 | * dev_name() and others to be used before the | |
1121 | * rest of the driver core is initialized. | |
1122 | */ | |
06fe53be | 1123 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1124 | if (match->id != -1) |
bd05086b PM |
1125 | match->dev.init_name = |
1126 | kasprintf(GFP_KERNEL, "%s.%d", | |
1127 | match->name, | |
1128 | match->id); | |
a636ee7f | 1129 | else |
bd05086b PM |
1130 | match->dev.init_name = |
1131 | kasprintf(GFP_KERNEL, "%s", | |
1132 | match->name); | |
a636ee7f | 1133 | |
a636ee7f PM |
1134 | if (!match->dev.init_name) |
1135 | return -ENOMEM; | |
1136 | } | |
bd05086b | 1137 | |
13977091 MD |
1138 | if (epdrv->pdrv->probe(match)) |
1139 | pr_warning("%s: unable to probe %s early.\n", | |
1140 | class_str, match->name); | |
1141 | else | |
1142 | n++; | |
1143 | } | |
1144 | ||
1145 | if (n >= nr_probe) | |
1146 | break; | |
1147 | } | |
1148 | ||
1149 | if (left) | |
1150 | return n; | |
1151 | else | |
1152 | return -ENODEV; | |
1153 | } | |
1154 | ||
1155 | /** | |
4d26e139 | 1156 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1157 | * @class_str: string to identify early platform driver class |
1158 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1159 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1160 | * |
1161 | * Used by architecture code to probe registered early platform drivers | |
1162 | * within a certain class. For probe to happen a registered early platform | |
1163 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1164 | */ |
1165 | int __init early_platform_driver_probe(char *class_str, | |
1166 | int nr_probe, | |
1167 | int user_only) | |
1168 | { | |
1169 | int k, n, i; | |
1170 | ||
1171 | n = 0; | |
1172 | for (i = -2; n < nr_probe; i++) { | |
1173 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1174 | ||
1175 | if (k < 0) | |
1176 | break; | |
1177 | ||
1178 | n += k; | |
1179 | ||
1180 | if (user_only) | |
1181 | break; | |
1182 | } | |
1183 | ||
1184 | return n; | |
1185 | } | |
1186 | ||
1187 | /** | |
1188 | * early_platform_cleanup - clean up early platform code | |
1189 | */ | |
1190 | void __init early_platform_cleanup(void) | |
1191 | { | |
1192 | struct platform_device *pd, *pd2; | |
1193 | ||
1194 | /* clean up the devres list used to chain devices */ | |
1195 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1196 | dev.devres_head) { | |
1197 | list_del(&pd->dev.devres_head); | |
1198 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1199 | } | |
1200 | } | |
1201 |