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 BD |
25 | #include "base.h" |
26 | ||
689ae231 JD |
27 | /* For automatically allocated device IDs */ |
28 | static DEFINE_IDA(platform_devid_ida); | |
29 | ||
4a3ad20c GKH |
30 | #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \ |
31 | driver)) | |
00d3dcdd | 32 | |
1da177e4 | 33 | struct device platform_bus = { |
1e0b2cf9 | 34 | .init_name = "platform", |
1da177e4 | 35 | }; |
a96b2042 | 36 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 | 37 | |
a77ce816 KG |
38 | /** |
39 | * arch_setup_pdev_archdata - Allow manipulation of archdata before its used | |
7de636fa | 40 | * @pdev: platform device |
a77ce816 KG |
41 | * |
42 | * This is called before platform_device_add() such that any pdev_archdata may | |
43 | * be setup before the platform_notifier is called. So if a user needs to | |
44 | * manipulate any relevant information in the pdev_archdata they can do: | |
45 | * | |
46 | * platform_devic_alloc() | |
47 | * ... manipulate ... | |
48 | * platform_device_add() | |
49 | * | |
50 | * And if they don't care they can just call platform_device_register() and | |
51 | * everything will just work out. | |
52 | */ | |
53 | void __weak arch_setup_pdev_archdata(struct platform_device *pdev) | |
54 | { | |
55 | } | |
56 | ||
1da177e4 | 57 | /** |
4a3ad20c GKH |
58 | * platform_get_resource - get a resource for a device |
59 | * @dev: platform device | |
60 | * @type: resource type | |
61 | * @num: resource index | |
1da177e4 | 62 | */ |
4a3ad20c GKH |
63 | struct resource *platform_get_resource(struct platform_device *dev, |
64 | unsigned int type, unsigned int num) | |
1da177e4 LT |
65 | { |
66 | int i; | |
67 | ||
68 | for (i = 0; i < dev->num_resources; i++) { | |
69 | struct resource *r = &dev->resource[i]; | |
70 | ||
c9f66169 MD |
71 | if (type == resource_type(r) && num-- == 0) |
72 | return r; | |
1da177e4 LT |
73 | } |
74 | return NULL; | |
75 | } | |
a96b2042 | 76 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
77 | |
78 | /** | |
4a3ad20c GKH |
79 | * platform_get_irq - get an IRQ for a device |
80 | * @dev: platform device | |
81 | * @num: IRQ number index | |
1da177e4 LT |
82 | */ |
83 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
84 | { | |
85 | struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
86 | ||
305b3228 | 87 | return r ? r->start : -ENXIO; |
1da177e4 | 88 | } |
a96b2042 | 89 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
90 | |
91 | /** | |
4a3ad20c GKH |
92 | * platform_get_resource_byname - get a resource for a device by name |
93 | * @dev: platform device | |
94 | * @type: resource type | |
95 | * @name: resource name | |
1da177e4 | 96 | */ |
4a3ad20c | 97 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
98 | unsigned int type, |
99 | const char *name) | |
1da177e4 LT |
100 | { |
101 | int i; | |
102 | ||
103 | for (i = 0; i < dev->num_resources; i++) { | |
104 | struct resource *r = &dev->resource[i]; | |
105 | ||
c9f66169 MD |
106 | if (type == resource_type(r) && !strcmp(r->name, name)) |
107 | return r; | |
1da177e4 LT |
108 | } |
109 | return NULL; | |
110 | } | |
a96b2042 | 111 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
112 | |
113 | /** | |
4a3ad20c GKH |
114 | * platform_get_irq - get an IRQ for a device |
115 | * @dev: platform device | |
116 | * @name: IRQ name | |
1da177e4 | 117 | */ |
c0afe7ba | 118 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
1da177e4 | 119 | { |
4a3ad20c GKH |
120 | struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, |
121 | name); | |
1da177e4 | 122 | |
305b3228 | 123 | return r ? r->start : -ENXIO; |
1da177e4 | 124 | } |
a96b2042 | 125 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
126 | |
127 | /** | |
4a3ad20c GKH |
128 | * platform_add_devices - add a numbers of platform devices |
129 | * @devs: array of platform devices to add | |
130 | * @num: number of platform devices in array | |
1da177e4 LT |
131 | */ |
132 | int platform_add_devices(struct platform_device **devs, int num) | |
133 | { | |
134 | int i, ret = 0; | |
135 | ||
136 | for (i = 0; i < num; i++) { | |
137 | ret = platform_device_register(devs[i]); | |
138 | if (ret) { | |
139 | while (--i >= 0) | |
140 | platform_device_unregister(devs[i]); | |
141 | break; | |
142 | } | |
143 | } | |
144 | ||
145 | return ret; | |
146 | } | |
a96b2042 | 147 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 148 | |
37c12e74 RK |
149 | struct platform_object { |
150 | struct platform_device pdev; | |
151 | char name[1]; | |
152 | }; | |
153 | ||
1da177e4 | 154 | /** |
3c31f07a | 155 | * platform_device_put - destroy a platform device |
4a3ad20c | 156 | * @pdev: platform device to free |
37c12e74 | 157 | * |
4a3ad20c GKH |
158 | * Free all memory associated with a platform device. This function must |
159 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
160 | */ |
161 | void platform_device_put(struct platform_device *pdev) | |
162 | { | |
163 | if (pdev) | |
164 | put_device(&pdev->dev); | |
165 | } | |
166 | EXPORT_SYMBOL_GPL(platform_device_put); | |
167 | ||
168 | static void platform_device_release(struct device *dev) | |
169 | { | |
4a3ad20c GKH |
170 | struct platform_object *pa = container_of(dev, struct platform_object, |
171 | pdev.dev); | |
37c12e74 | 172 | |
7096d042 | 173 | of_device_node_put(&pa->pdev.dev); |
37c12e74 | 174 | kfree(pa->pdev.dev.platform_data); |
e710d7d5 | 175 | kfree(pa->pdev.mfd_cell); |
37c12e74 RK |
176 | kfree(pa->pdev.resource); |
177 | kfree(pa); | |
178 | } | |
179 | ||
180 | /** | |
3c31f07a | 181 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
182 | * @name: base name of the device we're adding |
183 | * @id: instance id | |
37c12e74 | 184 | * |
4a3ad20c GKH |
185 | * Create a platform device object which can have other objects attached |
186 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 187 | */ |
1359555e | 188 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
189 | { |
190 | struct platform_object *pa; | |
191 | ||
192 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); | |
193 | if (pa) { | |
194 | strcpy(pa->name, name); | |
195 | pa->pdev.name = pa->name; | |
196 | pa->pdev.id = id; | |
197 | device_initialize(&pa->pdev.dev); | |
198 | pa->pdev.dev.release = platform_device_release; | |
a77ce816 | 199 | arch_setup_pdev_archdata(&pa->pdev); |
37c12e74 RK |
200 | } |
201 | ||
93ce3061 | 202 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
203 | } |
204 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
205 | ||
206 | /** | |
3c31f07a | 207 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
208 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
209 | * @res: set of resources that needs to be allocated for the device | |
210 | * @num: number of resources | |
37c12e74 | 211 | * |
4a3ad20c GKH |
212 | * Add a copy of the resources to the platform device. The memory |
213 | * associated with the resources will be freed when the platform device is | |
214 | * released. | |
37c12e74 | 215 | */ |
4a3ad20c | 216 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 217 | const struct resource *res, unsigned int num) |
37c12e74 | 218 | { |
cea89623 | 219 | struct resource *r = NULL; |
37c12e74 | 220 | |
cea89623 UKK |
221 | if (res) { |
222 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); | |
223 | if (!r) | |
224 | return -ENOMEM; | |
37c12e74 | 225 | } |
cea89623 | 226 | |
4a03d6f7 | 227 | kfree(pdev->resource); |
cea89623 UKK |
228 | pdev->resource = r; |
229 | pdev->num_resources = num; | |
230 | return 0; | |
37c12e74 RK |
231 | } |
232 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
233 | ||
234 | /** | |
3c31f07a | 235 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
236 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
237 | * @data: platform specific data for this platform device | |
238 | * @size: size of platform specific data | |
37c12e74 | 239 | * |
4a3ad20c GKH |
240 | * Add a copy of platform specific data to the platform device's |
241 | * platform_data pointer. The memory associated with the platform data | |
242 | * will be freed when the platform device is released. | |
37c12e74 | 243 | */ |
4a3ad20c GKH |
244 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
245 | size_t size) | |
37c12e74 | 246 | { |
27a33f9e | 247 | void *d = NULL; |
5cfc64ce | 248 | |
27a33f9e UKK |
249 | if (data) { |
250 | d = kmemdup(data, size, GFP_KERNEL); | |
251 | if (!d) | |
252 | return -ENOMEM; | |
37c12e74 | 253 | } |
27a33f9e | 254 | |
251e031d | 255 | kfree(pdev->dev.platform_data); |
27a33f9e UKK |
256 | pdev->dev.platform_data = d; |
257 | return 0; | |
37c12e74 RK |
258 | } |
259 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
260 | ||
261 | /** | |
4a3ad20c GKH |
262 | * platform_device_add - add a platform device to device hierarchy |
263 | * @pdev: platform device we're adding | |
1da177e4 | 264 | * |
4a3ad20c GKH |
265 | * This is part 2 of platform_device_register(), though may be called |
266 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 267 | */ |
37c12e74 | 268 | int platform_device_add(struct platform_device *pdev) |
1da177e4 | 269 | { |
689ae231 | 270 | int i, ret; |
1da177e4 LT |
271 | |
272 | if (!pdev) | |
273 | return -EINVAL; | |
274 | ||
275 | if (!pdev->dev.parent) | |
276 | pdev->dev.parent = &platform_bus; | |
277 | ||
278 | pdev->dev.bus = &platform_bus_type; | |
279 | ||
689ae231 JD |
280 | switch (pdev->id) { |
281 | default: | |
1e0b2cf9 | 282 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
689ae231 JD |
283 | break; |
284 | case PLATFORM_DEVID_NONE: | |
acc0e90f | 285 | dev_set_name(&pdev->dev, "%s", pdev->name); |
689ae231 JD |
286 | break; |
287 | case PLATFORM_DEVID_AUTO: | |
288 | /* | |
289 | * Automatically allocated device ID. We mark it as such so | |
290 | * that we remember it must be freed, and we append a suffix | |
291 | * to avoid namespace collision with explicit IDs. | |
292 | */ | |
293 | ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL); | |
294 | if (ret < 0) | |
295 | goto err_out; | |
296 | pdev->id = ret; | |
297 | pdev->id_auto = true; | |
298 | dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); | |
299 | break; | |
300 | } | |
1da177e4 LT |
301 | |
302 | for (i = 0; i < pdev->num_resources; i++) { | |
303 | struct resource *p, *r = &pdev->resource[i]; | |
304 | ||
305 | if (r->name == NULL) | |
1e0b2cf9 | 306 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
307 | |
308 | p = r->parent; | |
309 | if (!p) { | |
c9f66169 | 310 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 311 | p = &iomem_resource; |
c9f66169 | 312 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
313 | p = &ioport_resource; |
314 | } | |
315 | ||
d960bb4d | 316 | if (p && insert_resource(p, r)) { |
1da177e4 LT |
317 | printk(KERN_ERR |
318 | "%s: failed to claim resource %d\n", | |
1e0b2cf9 | 319 | dev_name(&pdev->dev), i); |
1da177e4 LT |
320 | ret = -EBUSY; |
321 | goto failed; | |
322 | } | |
323 | } | |
324 | ||
325 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 326 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 327 | |
e3915532 | 328 | ret = device_add(&pdev->dev); |
1da177e4 LT |
329 | if (ret == 0) |
330 | return ret; | |
331 | ||
332 | failed: | |
689ae231 JD |
333 | if (pdev->id_auto) { |
334 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
335 | pdev->id = PLATFORM_DEVID_AUTO; | |
336 | } | |
337 | ||
c9f66169 MD |
338 | while (--i >= 0) { |
339 | struct resource *r = &pdev->resource[i]; | |
340 | unsigned long type = resource_type(r); | |
341 | ||
342 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
343 | release_resource(r); | |
344 | } | |
345 | ||
689ae231 | 346 | err_out: |
1da177e4 LT |
347 | return ret; |
348 | } | |
37c12e74 RK |
349 | EXPORT_SYMBOL_GPL(platform_device_add); |
350 | ||
351 | /** | |
4a3ad20c GKH |
352 | * platform_device_del - remove a platform-level device |
353 | * @pdev: platform device we're removing | |
1da177e4 | 354 | * |
4a3ad20c GKH |
355 | * Note that this function will also release all memory- and port-based |
356 | * resources owned by the device (@dev->resource). This function must | |
357 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 358 | */ |
93ce3061 | 359 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
360 | { |
361 | int i; | |
362 | ||
363 | if (pdev) { | |
dc4c15d4 JD |
364 | device_del(&pdev->dev); |
365 | ||
689ae231 JD |
366 | if (pdev->id_auto) { |
367 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
368 | pdev->id = PLATFORM_DEVID_AUTO; | |
369 | } | |
370 | ||
1da177e4 LT |
371 | for (i = 0; i < pdev->num_resources; i++) { |
372 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
373 | unsigned long type = resource_type(r); |
374 | ||
375 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
376 | release_resource(r); |
377 | } | |
1da177e4 LT |
378 | } |
379 | } | |
93ce3061 DT |
380 | EXPORT_SYMBOL_GPL(platform_device_del); |
381 | ||
382 | /** | |
4a3ad20c GKH |
383 | * platform_device_register - add a platform-level device |
384 | * @pdev: platform device we're adding | |
93ce3061 | 385 | */ |
4a3ad20c | 386 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
387 | { |
388 | device_initialize(&pdev->dev); | |
a77ce816 | 389 | arch_setup_pdev_archdata(pdev); |
93ce3061 DT |
390 | return platform_device_add(pdev); |
391 | } | |
a96b2042 | 392 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
393 | |
394 | /** | |
4a3ad20c GKH |
395 | * platform_device_unregister - unregister a platform-level device |
396 | * @pdev: platform device we're unregistering | |
93ce3061 | 397 | * |
4a3ad20c GKH |
398 | * Unregistration is done in 2 steps. First we release all resources |
399 | * and remove it from the subsystem, then we drop reference count by | |
400 | * calling platform_device_put(). | |
93ce3061 | 401 | */ |
4a3ad20c | 402 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
403 | { |
404 | platform_device_del(pdev); | |
405 | platform_device_put(pdev); | |
406 | } | |
a96b2042 | 407 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 408 | |
1da177e4 | 409 | /** |
01dcc60a | 410 | * platform_device_register_full - add a platform-level device with |
44f28bde | 411 | * resources and platform-specific data |
49a4ec18 | 412 | * |
01dcc60a | 413 | * @pdevinfo: data used to create device |
d8bf2540 | 414 | * |
f0eae0ed | 415 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 416 | */ |
01dcc60a | 417 | struct platform_device *platform_device_register_full( |
5a3072be | 418 | const struct platform_device_info *pdevinfo) |
d8bf2540 | 419 | { |
44f28bde | 420 | int ret = -ENOMEM; |
d8bf2540 | 421 | struct platform_device *pdev; |
d8bf2540 | 422 | |
01dcc60a | 423 | pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
44f28bde | 424 | if (!pdev) |
01dcc60a UKK |
425 | goto err_alloc; |
426 | ||
427 | pdev->dev.parent = pdevinfo->parent; | |
428 | ||
429 | if (pdevinfo->dma_mask) { | |
430 | /* | |
431 | * This memory isn't freed when the device is put, | |
432 | * I don't have a nice idea for that though. Conceptually | |
433 | * dma_mask in struct device should not be a pointer. | |
434 | * See http://thread.gmane.org/gmane.linux.kernel.pci/9081 | |
435 | */ | |
436 | pdev->dev.dma_mask = | |
437 | kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); | |
438 | if (!pdev->dev.dma_mask) | |
439 | goto err; | |
440 | ||
441 | *pdev->dev.dma_mask = pdevinfo->dma_mask; | |
442 | pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; | |
443 | } | |
d8bf2540 | 444 | |
01dcc60a UKK |
445 | ret = platform_device_add_resources(pdev, |
446 | pdevinfo->res, pdevinfo->num_res); | |
807508c8 AV |
447 | if (ret) |
448 | goto err; | |
44f28bde | 449 | |
01dcc60a UKK |
450 | ret = platform_device_add_data(pdev, |
451 | pdevinfo->data, pdevinfo->size_data); | |
807508c8 AV |
452 | if (ret) |
453 | goto err; | |
d8bf2540 | 454 | |
44f28bde UKK |
455 | ret = platform_device_add(pdev); |
456 | if (ret) { | |
457 | err: | |
01dcc60a UKK |
458 | kfree(pdev->dev.dma_mask); |
459 | ||
460 | err_alloc: | |
44f28bde UKK |
461 | platform_device_put(pdev); |
462 | return ERR_PTR(ret); | |
463 | } | |
d8bf2540 DB |
464 | |
465 | return pdev; | |
d8bf2540 | 466 | } |
01dcc60a | 467 | EXPORT_SYMBOL_GPL(platform_device_register_full); |
d8bf2540 | 468 | |
00d3dcdd RK |
469 | static int platform_drv_probe(struct device *_dev) |
470 | { | |
471 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
472 | struct platform_device *dev = to_platform_device(_dev); | |
473 | ||
474 | return drv->probe(dev); | |
475 | } | |
476 | ||
c67334fb DB |
477 | static int platform_drv_probe_fail(struct device *_dev) |
478 | { | |
479 | return -ENXIO; | |
480 | } | |
481 | ||
00d3dcdd RK |
482 | static int platform_drv_remove(struct device *_dev) |
483 | { | |
484 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
485 | struct platform_device *dev = to_platform_device(_dev); | |
486 | ||
487 | return drv->remove(dev); | |
488 | } | |
489 | ||
490 | static void platform_drv_shutdown(struct device *_dev) | |
491 | { | |
492 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
493 | struct platform_device *dev = to_platform_device(_dev); | |
494 | ||
495 | drv->shutdown(dev); | |
496 | } | |
497 | ||
00d3dcdd | 498 | /** |
3c31f07a | 499 | * platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 500 | * @drv: platform driver structure |
00d3dcdd RK |
501 | */ |
502 | int platform_driver_register(struct platform_driver *drv) | |
503 | { | |
504 | drv->driver.bus = &platform_bus_type; | |
505 | if (drv->probe) | |
506 | drv->driver.probe = platform_drv_probe; | |
507 | if (drv->remove) | |
508 | drv->driver.remove = platform_drv_remove; | |
509 | if (drv->shutdown) | |
510 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 511 | |
00d3dcdd RK |
512 | return driver_register(&drv->driver); |
513 | } | |
514 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
515 | ||
516 | /** | |
3c31f07a | 517 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 518 | * @drv: platform driver structure |
00d3dcdd RK |
519 | */ |
520 | void platform_driver_unregister(struct platform_driver *drv) | |
521 | { | |
522 | driver_unregister(&drv->driver); | |
523 | } | |
524 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
525 | ||
c67334fb DB |
526 | /** |
527 | * platform_driver_probe - register driver for non-hotpluggable device | |
528 | * @drv: platform driver structure | |
529 | * @probe: the driver probe routine, probably from an __init section | |
530 | * | |
531 | * Use this instead of platform_driver_register() when you know the device | |
532 | * is not hotpluggable and has already been registered, and you want to | |
533 | * remove its run-once probe() infrastructure from memory after the driver | |
534 | * has bound to the device. | |
535 | * | |
536 | * One typical use for this would be with drivers for controllers integrated | |
537 | * into system-on-chip processors, where the controller devices have been | |
538 | * configured as part of board setup. | |
539 | * | |
540 | * Returns zero if the driver registered and bound to a device, else returns | |
541 | * a negative error code and with the driver not registered. | |
542 | */ | |
c63e0783 | 543 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
544 | int (*probe)(struct platform_device *)) |
545 | { | |
546 | int retval, code; | |
547 | ||
1a6f2a75 DT |
548 | /* make sure driver won't have bind/unbind attributes */ |
549 | drv->driver.suppress_bind_attrs = true; | |
550 | ||
c67334fb DB |
551 | /* temporary section violation during probe() */ |
552 | drv->probe = probe; | |
553 | retval = code = platform_driver_register(drv); | |
554 | ||
1a6f2a75 DT |
555 | /* |
556 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
557 | * the list of drivers in order to probe new devices. Check to see |
558 | * if the probe was successful, and make sure any forced probes of | |
559 | * new devices fail. | |
560 | */ | |
d79d3244 | 561 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb | 562 | drv->probe = NULL; |
e5dd1278 | 563 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
564 | retval = -ENODEV; |
565 | drv->driver.probe = platform_drv_probe_fail; | |
d79d3244 | 566 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
567 | |
568 | if (code != retval) | |
569 | platform_driver_unregister(drv); | |
570 | return retval; | |
571 | } | |
572 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 573 | |
ecdf6ceb DT |
574 | /** |
575 | * platform_create_bundle - register driver and create corresponding device | |
576 | * @driver: platform driver structure | |
577 | * @probe: the driver probe routine, probably from an __init section | |
578 | * @res: set of resources that needs to be allocated for the device | |
579 | * @n_res: number of resources | |
580 | * @data: platform specific data for this platform device | |
581 | * @size: size of platform specific data | |
582 | * | |
583 | * Use this in legacy-style modules that probe hardware directly and | |
584 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
585 | * |
586 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb DT |
587 | */ |
588 | struct platform_device * __init_or_module platform_create_bundle( | |
589 | struct platform_driver *driver, | |
590 | int (*probe)(struct platform_device *), | |
591 | struct resource *res, unsigned int n_res, | |
592 | const void *data, size_t size) | |
593 | { | |
594 | struct platform_device *pdev; | |
595 | int error; | |
596 | ||
597 | pdev = platform_device_alloc(driver->driver.name, -1); | |
598 | if (!pdev) { | |
599 | error = -ENOMEM; | |
600 | goto err_out; | |
601 | } | |
602 | ||
807508c8 AV |
603 | error = platform_device_add_resources(pdev, res, n_res); |
604 | if (error) | |
605 | goto err_pdev_put; | |
ecdf6ceb | 606 | |
807508c8 AV |
607 | error = platform_device_add_data(pdev, data, size); |
608 | if (error) | |
609 | goto err_pdev_put; | |
ecdf6ceb DT |
610 | |
611 | error = platform_device_add(pdev); | |
612 | if (error) | |
613 | goto err_pdev_put; | |
614 | ||
615 | error = platform_driver_probe(driver, probe); | |
616 | if (error) | |
617 | goto err_pdev_del; | |
618 | ||
619 | return pdev; | |
620 | ||
621 | err_pdev_del: | |
622 | platform_device_del(pdev); | |
623 | err_pdev_put: | |
624 | platform_device_put(pdev); | |
625 | err_out: | |
626 | return ERR_PTR(error); | |
627 | } | |
628 | EXPORT_SYMBOL_GPL(platform_create_bundle); | |
629 | ||
a0245f7a DB |
630 | /* modalias support enables more hands-off userspace setup: |
631 | * (a) environment variable lets new-style hotplug events work once system is | |
632 | * fully running: "modprobe $MODALIAS" | |
633 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
634 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
635 | */ | |
4a3ad20c GKH |
636 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
637 | char *buf) | |
a0245f7a DB |
638 | { |
639 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 640 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
641 | |
642 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
643 | } | |
644 | ||
645 | static struct device_attribute platform_dev_attrs[] = { | |
646 | __ATTR_RO(modalias), | |
647 | __ATTR_NULL, | |
648 | }; | |
649 | ||
7eff2e7a | 650 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
651 | { |
652 | struct platform_device *pdev = to_platform_device(dev); | |
eca39301 GL |
653 | int rc; |
654 | ||
655 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
07d57a32 | 656 | rc = of_device_uevent_modalias(dev,env); |
eca39301 GL |
657 | if (rc != -ENODEV) |
658 | return rc; | |
a0245f7a | 659 | |
57fee4a5 | 660 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
0a26813c | 661 | pdev->name); |
a0245f7a DB |
662 | return 0; |
663 | } | |
664 | ||
57fee4a5 | 665 | static const struct platform_device_id *platform_match_id( |
831fad2f | 666 | const struct platform_device_id *id, |
57fee4a5 EM |
667 | struct platform_device *pdev) |
668 | { | |
669 | while (id->name[0]) { | |
670 | if (strcmp(pdev->name, id->name) == 0) { | |
671 | pdev->id_entry = id; | |
672 | return id; | |
673 | } | |
674 | id++; | |
675 | } | |
676 | return NULL; | |
677 | } | |
678 | ||
1da177e4 | 679 | /** |
4a3ad20c GKH |
680 | * platform_match - bind platform device to platform driver. |
681 | * @dev: device. | |
682 | * @drv: driver. | |
1da177e4 | 683 | * |
4a3ad20c GKH |
684 | * Platform device IDs are assumed to be encoded like this: |
685 | * "<name><instance>", where <name> is a short description of the type of | |
686 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
687 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
688 | * "<name>". So, extract the <name> from the platform_device structure, | |
689 | * and compare it against the name of the driver. Return whether they match | |
690 | * or not. | |
1da177e4 | 691 | */ |
4a3ad20c | 692 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 693 | { |
71b3e0c1 | 694 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
695 | struct platform_driver *pdrv = to_platform_driver(drv); |
696 | ||
05212157 GL |
697 | /* Attempt an OF style match first */ |
698 | if (of_driver_match_device(dev, drv)) | |
699 | return 1; | |
700 | ||
701 | /* Then try to match against the id table */ | |
57fee4a5 EM |
702 | if (pdrv->id_table) |
703 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 704 | |
57fee4a5 | 705 | /* fall-back to driver name match */ |
1e0b2cf9 | 706 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
707 | } |
708 | ||
25e18499 RW |
709 | #ifdef CONFIG_PM_SLEEP |
710 | ||
711 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 712 | { |
783ea7d4 MD |
713 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
714 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
715 | int ret = 0; |
716 | ||
783ea7d4 MD |
717 | if (dev->driver && pdrv->suspend) |
718 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
719 | |
720 | return ret; | |
721 | } | |
722 | ||
25e18499 | 723 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 724 | { |
783ea7d4 MD |
725 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
726 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
727 | int ret = 0; |
728 | ||
783ea7d4 MD |
729 | if (dev->driver && pdrv->resume) |
730 | ret = pdrv->resume(pdev); | |
9480e307 | 731 | |
1da177e4 LT |
732 | return ret; |
733 | } | |
734 | ||
69c9dd1e | 735 | #endif /* CONFIG_PM_SLEEP */ |
9d730229 | 736 | |
25e18499 RW |
737 | #ifdef CONFIG_SUSPEND |
738 | ||
69c9dd1e | 739 | int platform_pm_suspend(struct device *dev) |
25e18499 RW |
740 | { |
741 | struct device_driver *drv = dev->driver; | |
742 | int ret = 0; | |
743 | ||
adf09493 RW |
744 | if (!drv) |
745 | return 0; | |
746 | ||
747 | if (drv->pm) { | |
25e18499 RW |
748 | if (drv->pm->suspend) |
749 | ret = drv->pm->suspend(dev); | |
750 | } else { | |
751 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
752 | } | |
753 | ||
754 | return ret; | |
755 | } | |
756 | ||
69c9dd1e | 757 | int platform_pm_resume(struct device *dev) |
25e18499 RW |
758 | { |
759 | struct device_driver *drv = dev->driver; | |
760 | int ret = 0; | |
761 | ||
adf09493 RW |
762 | if (!drv) |
763 | return 0; | |
764 | ||
765 | if (drv->pm) { | |
25e18499 RW |
766 | if (drv->pm->resume) |
767 | ret = drv->pm->resume(dev); | |
768 | } else { | |
769 | ret = platform_legacy_resume(dev); | |
770 | } | |
771 | ||
772 | return ret; | |
773 | } | |
774 | ||
69c9dd1e | 775 | #endif /* CONFIG_SUSPEND */ |
25e18499 | 776 | |
1f112cee | 777 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 | 778 | |
69c9dd1e | 779 | int platform_pm_freeze(struct device *dev) |
25e18499 RW |
780 | { |
781 | struct device_driver *drv = dev->driver; | |
782 | int ret = 0; | |
783 | ||
784 | if (!drv) | |
785 | return 0; | |
786 | ||
787 | if (drv->pm) { | |
788 | if (drv->pm->freeze) | |
789 | ret = drv->pm->freeze(dev); | |
790 | } else { | |
791 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
792 | } | |
793 | ||
794 | return ret; | |
795 | } | |
796 | ||
69c9dd1e | 797 | int platform_pm_thaw(struct device *dev) |
25e18499 RW |
798 | { |
799 | struct device_driver *drv = dev->driver; | |
800 | int ret = 0; | |
801 | ||
adf09493 RW |
802 | if (!drv) |
803 | return 0; | |
804 | ||
805 | if (drv->pm) { | |
25e18499 RW |
806 | if (drv->pm->thaw) |
807 | ret = drv->pm->thaw(dev); | |
808 | } else { | |
809 | ret = platform_legacy_resume(dev); | |
810 | } | |
811 | ||
812 | return ret; | |
813 | } | |
814 | ||
69c9dd1e | 815 | int platform_pm_poweroff(struct device *dev) |
25e18499 RW |
816 | { |
817 | struct device_driver *drv = dev->driver; | |
818 | int ret = 0; | |
819 | ||
adf09493 RW |
820 | if (!drv) |
821 | return 0; | |
822 | ||
823 | if (drv->pm) { | |
25e18499 RW |
824 | if (drv->pm->poweroff) |
825 | ret = drv->pm->poweroff(dev); | |
826 | } else { | |
827 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
828 | } | |
829 | ||
830 | return ret; | |
831 | } | |
832 | ||
69c9dd1e | 833 | int platform_pm_restore(struct device *dev) |
25e18499 RW |
834 | { |
835 | struct device_driver *drv = dev->driver; | |
836 | int ret = 0; | |
837 | ||
adf09493 RW |
838 | if (!drv) |
839 | return 0; | |
840 | ||
841 | if (drv->pm) { | |
25e18499 RW |
842 | if (drv->pm->restore) |
843 | ret = drv->pm->restore(dev); | |
844 | } else { | |
845 | ret = platform_legacy_resume(dev); | |
846 | } | |
847 | ||
848 | return ret; | |
849 | } | |
850 | ||
69c9dd1e | 851 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 852 | |
d9ab7716 | 853 | static const struct dev_pm_ops platform_dev_pm_ops = { |
8b313a38 RW |
854 | .runtime_suspend = pm_generic_runtime_suspend, |
855 | .runtime_resume = pm_generic_runtime_resume, | |
856 | .runtime_idle = pm_generic_runtime_idle, | |
69c9dd1e | 857 | USE_PLATFORM_PM_SLEEP_OPS |
25e18499 RW |
858 | }; |
859 | ||
1da177e4 LT |
860 | struct bus_type platform_bus_type = { |
861 | .name = "platform", | |
a0245f7a | 862 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 863 | .match = platform_match, |
a0245f7a | 864 | .uevent = platform_uevent, |
9d730229 | 865 | .pm = &platform_dev_pm_ops, |
1da177e4 | 866 | }; |
a96b2042 | 867 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
868 | |
869 | int __init platform_bus_init(void) | |
870 | { | |
fbfb1445 CH |
871 | int error; |
872 | ||
13977091 MD |
873 | early_platform_cleanup(); |
874 | ||
fbfb1445 CH |
875 | error = device_register(&platform_bus); |
876 | if (error) | |
877 | return error; | |
878 | error = bus_register(&platform_bus_type); | |
879 | if (error) | |
880 | device_unregister(&platform_bus); | |
881 | return error; | |
1da177e4 LT |
882 | } |
883 | ||
884 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
885 | u64 dma_get_required_mask(struct device *dev) | |
886 | { | |
887 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
888 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
889 | u64 mask; | |
890 | ||
891 | if (!high_totalram) { | |
892 | /* convert to mask just covering totalram */ | |
893 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
894 | low_totalram += low_totalram - 1; | |
895 | mask = low_totalram; | |
896 | } else { | |
897 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
898 | high_totalram += high_totalram - 1; | |
899 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
900 | } | |
e88a0c2c | 901 | return mask; |
1da177e4 LT |
902 | } |
903 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
904 | #endif | |
13977091 MD |
905 | |
906 | static __initdata LIST_HEAD(early_platform_driver_list); | |
907 | static __initdata LIST_HEAD(early_platform_device_list); | |
908 | ||
909 | /** | |
4d26e139 | 910 | * early_platform_driver_register - register early platform driver |
d86c1302 | 911 | * @epdrv: early_platform driver structure |
13977091 | 912 | * @buf: string passed from early_param() |
4d26e139 MD |
913 | * |
914 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
915 | */ |
916 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
917 | char *buf) | |
918 | { | |
c60e0504 | 919 | char *tmp; |
13977091 MD |
920 | int n; |
921 | ||
922 | /* Simply add the driver to the end of the global list. | |
923 | * Drivers will by default be put on the list in compiled-in order. | |
924 | */ | |
925 | if (!epdrv->list.next) { | |
926 | INIT_LIST_HEAD(&epdrv->list); | |
927 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
928 | } | |
929 | ||
930 | /* If the user has specified device then make sure the driver | |
931 | * gets prioritized. The driver of the last device specified on | |
932 | * command line will be put first on the list. | |
933 | */ | |
934 | n = strlen(epdrv->pdrv->driver.name); | |
935 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
936 | list_move(&epdrv->list, &early_platform_driver_list); | |
937 | ||
c60e0504 MD |
938 | /* Allow passing parameters after device name */ |
939 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 940 | epdrv->requested_id = -1; |
c60e0504 MD |
941 | else { |
942 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
943 | &tmp, 10); | |
944 | ||
945 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
946 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
947 | n = 0; | |
948 | } else | |
949 | n += strcspn(&buf[n + 1], ",") + 1; | |
950 | } | |
951 | ||
952 | if (buf[n] == ',') | |
953 | n++; | |
954 | ||
955 | if (epdrv->bufsize) { | |
956 | memcpy(epdrv->buffer, &buf[n], | |
957 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
958 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
959 | } | |
13977091 MD |
960 | } |
961 | ||
962 | return 0; | |
963 | } | |
964 | ||
965 | /** | |
4d26e139 | 966 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
967 | * @devs: array of early platform devices to add |
968 | * @num: number of early platform devices in array | |
4d26e139 MD |
969 | * |
970 | * Used by early architecture code to register early platform devices and | |
971 | * their platform data. | |
13977091 MD |
972 | */ |
973 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
974 | { | |
975 | struct device *dev; | |
976 | int i; | |
977 | ||
978 | /* simply add the devices to list */ | |
979 | for (i = 0; i < num; i++) { | |
980 | dev = &devs[i]->dev; | |
981 | ||
982 | if (!dev->devres_head.next) { | |
983 | INIT_LIST_HEAD(&dev->devres_head); | |
984 | list_add_tail(&dev->devres_head, | |
985 | &early_platform_device_list); | |
986 | } | |
987 | } | |
988 | } | |
989 | ||
990 | /** | |
4d26e139 | 991 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 992 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
993 | * |
994 | * Used by architecture code to register all early platform drivers | |
995 | * for a certain class. If omitted then only early platform drivers | |
996 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
997 | */ |
998 | void __init early_platform_driver_register_all(char *class_str) | |
999 | { | |
1000 | /* The "class_str" parameter may or may not be present on the kernel | |
1001 | * command line. If it is present then there may be more than one | |
1002 | * matching parameter. | |
1003 | * | |
1004 | * Since we register our early platform drivers using early_param() | |
1005 | * we need to make sure that they also get registered in the case | |
1006 | * when the parameter is missing from the kernel command line. | |
1007 | * | |
1008 | * We use parse_early_options() to make sure the early_param() gets | |
1009 | * called at least once. The early_param() may be called more than | |
1010 | * once since the name of the preferred device may be specified on | |
1011 | * the kernel command line. early_platform_driver_register() handles | |
1012 | * this case for us. | |
1013 | */ | |
1014 | parse_early_options(class_str); | |
1015 | } | |
1016 | ||
1017 | /** | |
4d26e139 | 1018 | * early_platform_match - find early platform device matching driver |
d86c1302 | 1019 | * @epdrv: early platform driver structure |
13977091 MD |
1020 | * @id: id to match against |
1021 | */ | |
1022 | static __init struct platform_device * | |
1023 | early_platform_match(struct early_platform_driver *epdrv, int id) | |
1024 | { | |
1025 | struct platform_device *pd; | |
1026 | ||
1027 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1028 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1029 | if (pd->id == id) | |
1030 | return pd; | |
1031 | ||
1032 | return NULL; | |
1033 | } | |
1034 | ||
1035 | /** | |
4d26e139 | 1036 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1037 | * @epdrv: early platform driver structure |
13977091 MD |
1038 | * @id: return true if id or above exists |
1039 | */ | |
1040 | static __init int early_platform_left(struct early_platform_driver *epdrv, | |
1041 | int id) | |
1042 | { | |
1043 | struct platform_device *pd; | |
1044 | ||
1045 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1046 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1047 | if (pd->id >= id) | |
1048 | return 1; | |
1049 | ||
1050 | return 0; | |
1051 | } | |
1052 | ||
1053 | /** | |
4d26e139 | 1054 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1055 | * @class_str: string to identify early platform driver class |
1056 | * @id: id to match against | |
1057 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1058 | */ | |
1059 | static int __init early_platform_driver_probe_id(char *class_str, | |
1060 | int id, | |
1061 | int nr_probe) | |
1062 | { | |
1063 | struct early_platform_driver *epdrv; | |
1064 | struct platform_device *match; | |
1065 | int match_id; | |
1066 | int n = 0; | |
1067 | int left = 0; | |
1068 | ||
1069 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1070 | /* only use drivers matching our class_str */ | |
1071 | if (strcmp(class_str, epdrv->class_str)) | |
1072 | continue; | |
1073 | ||
1074 | if (id == -2) { | |
1075 | match_id = epdrv->requested_id; | |
1076 | left = 1; | |
1077 | ||
1078 | } else { | |
1079 | match_id = id; | |
1080 | left += early_platform_left(epdrv, id); | |
1081 | ||
1082 | /* skip requested id */ | |
1083 | switch (epdrv->requested_id) { | |
1084 | case EARLY_PLATFORM_ID_ERROR: | |
1085 | case EARLY_PLATFORM_ID_UNSET: | |
1086 | break; | |
1087 | default: | |
1088 | if (epdrv->requested_id == id) | |
1089 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | switch (match_id) { | |
1094 | case EARLY_PLATFORM_ID_ERROR: | |
1095 | pr_warning("%s: unable to parse %s parameter\n", | |
1096 | class_str, epdrv->pdrv->driver.name); | |
1097 | /* fall-through */ | |
1098 | case EARLY_PLATFORM_ID_UNSET: | |
1099 | match = NULL; | |
1100 | break; | |
1101 | default: | |
1102 | match = early_platform_match(epdrv, match_id); | |
1103 | } | |
1104 | ||
1105 | if (match) { | |
a636ee7f PM |
1106 | /* |
1107 | * Set up a sensible init_name to enable | |
1108 | * dev_name() and others to be used before the | |
1109 | * rest of the driver core is initialized. | |
1110 | */ | |
06fe53be | 1111 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1112 | if (match->id != -1) |
bd05086b PM |
1113 | match->dev.init_name = |
1114 | kasprintf(GFP_KERNEL, "%s.%d", | |
1115 | match->name, | |
1116 | match->id); | |
a636ee7f | 1117 | else |
bd05086b PM |
1118 | match->dev.init_name = |
1119 | kasprintf(GFP_KERNEL, "%s", | |
1120 | match->name); | |
a636ee7f | 1121 | |
a636ee7f PM |
1122 | if (!match->dev.init_name) |
1123 | return -ENOMEM; | |
1124 | } | |
bd05086b | 1125 | |
13977091 MD |
1126 | if (epdrv->pdrv->probe(match)) |
1127 | pr_warning("%s: unable to probe %s early.\n", | |
1128 | class_str, match->name); | |
1129 | else | |
1130 | n++; | |
1131 | } | |
1132 | ||
1133 | if (n >= nr_probe) | |
1134 | break; | |
1135 | } | |
1136 | ||
1137 | if (left) | |
1138 | return n; | |
1139 | else | |
1140 | return -ENODEV; | |
1141 | } | |
1142 | ||
1143 | /** | |
4d26e139 | 1144 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1145 | * @class_str: string to identify early platform driver class |
1146 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1147 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1148 | * |
1149 | * Used by architecture code to probe registered early platform drivers | |
1150 | * within a certain class. For probe to happen a registered early platform | |
1151 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1152 | */ |
1153 | int __init early_platform_driver_probe(char *class_str, | |
1154 | int nr_probe, | |
1155 | int user_only) | |
1156 | { | |
1157 | int k, n, i; | |
1158 | ||
1159 | n = 0; | |
1160 | for (i = -2; n < nr_probe; i++) { | |
1161 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1162 | ||
1163 | if (k < 0) | |
1164 | break; | |
1165 | ||
1166 | n += k; | |
1167 | ||
1168 | if (user_only) | |
1169 | break; | |
1170 | } | |
1171 | ||
1172 | return n; | |
1173 | } | |
1174 | ||
1175 | /** | |
1176 | * early_platform_cleanup - clean up early platform code | |
1177 | */ | |
1178 | void __init early_platform_cleanup(void) | |
1179 | { | |
1180 | struct platform_device *pd, *pd2; | |
1181 | ||
1182 | /* clean up the devres list used to chain devices */ | |
1183 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1184 | dev.devres_head) { | |
1185 | list_del(&pd->dev.devres_head); | |
1186 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1187 | } | |
1188 | } | |
1189 |