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 | ||
d052d1be | 13 | #include <linux/platform_device.h> |
1da177e4 LT |
14 | #include <linux/module.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/dma-mapping.h> | |
17 | #include <linux/bootmem.h> | |
18 | #include <linux/err.h> | |
4e57b681 | 19 | #include <linux/slab.h> |
1da177e4 | 20 | |
a1bdc7aa BD |
21 | #include "base.h" |
22 | ||
4a3ad20c GKH |
23 | #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \ |
24 | driver)) | |
00d3dcdd | 25 | |
1da177e4 | 26 | struct device platform_bus = { |
1e0b2cf9 | 27 | .init_name = "platform", |
1da177e4 | 28 | }; |
a96b2042 | 29 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 LT |
30 | |
31 | /** | |
4a3ad20c GKH |
32 | * platform_get_resource - get a resource for a device |
33 | * @dev: platform device | |
34 | * @type: resource type | |
35 | * @num: resource index | |
1da177e4 | 36 | */ |
4a3ad20c GKH |
37 | struct resource *platform_get_resource(struct platform_device *dev, |
38 | unsigned int type, unsigned int num) | |
1da177e4 LT |
39 | { |
40 | int i; | |
41 | ||
42 | for (i = 0; i < dev->num_resources; i++) { | |
43 | struct resource *r = &dev->resource[i]; | |
44 | ||
c9f66169 MD |
45 | if (type == resource_type(r) && num-- == 0) |
46 | return r; | |
1da177e4 LT |
47 | } |
48 | return NULL; | |
49 | } | |
a96b2042 | 50 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
51 | |
52 | /** | |
4a3ad20c GKH |
53 | * platform_get_irq - get an IRQ for a device |
54 | * @dev: platform device | |
55 | * @num: IRQ number index | |
1da177e4 LT |
56 | */ |
57 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
58 | { | |
59 | struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
60 | ||
305b3228 | 61 | return r ? r->start : -ENXIO; |
1da177e4 | 62 | } |
a96b2042 | 63 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
64 | |
65 | /** | |
4a3ad20c GKH |
66 | * platform_get_resource_byname - get a resource for a device by name |
67 | * @dev: platform device | |
68 | * @type: resource type | |
69 | * @name: resource name | |
1da177e4 | 70 | */ |
4a3ad20c | 71 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
72 | unsigned int type, |
73 | const char *name) | |
1da177e4 LT |
74 | { |
75 | int i; | |
76 | ||
77 | for (i = 0; i < dev->num_resources; i++) { | |
78 | struct resource *r = &dev->resource[i]; | |
79 | ||
c9f66169 MD |
80 | if (type == resource_type(r) && !strcmp(r->name, name)) |
81 | return r; | |
1da177e4 LT |
82 | } |
83 | return NULL; | |
84 | } | |
a96b2042 | 85 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
86 | |
87 | /** | |
4a3ad20c GKH |
88 | * platform_get_irq - get an IRQ for a device |
89 | * @dev: platform device | |
90 | * @name: IRQ name | |
1da177e4 | 91 | */ |
c0afe7ba | 92 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
1da177e4 | 93 | { |
4a3ad20c GKH |
94 | struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, |
95 | name); | |
1da177e4 | 96 | |
305b3228 | 97 | return r ? r->start : -ENXIO; |
1da177e4 | 98 | } |
a96b2042 | 99 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
100 | |
101 | /** | |
4a3ad20c GKH |
102 | * platform_add_devices - add a numbers of platform devices |
103 | * @devs: array of platform devices to add | |
104 | * @num: number of platform devices in array | |
1da177e4 LT |
105 | */ |
106 | int platform_add_devices(struct platform_device **devs, int num) | |
107 | { | |
108 | int i, ret = 0; | |
109 | ||
110 | for (i = 0; i < num; i++) { | |
111 | ret = platform_device_register(devs[i]); | |
112 | if (ret) { | |
113 | while (--i >= 0) | |
114 | platform_device_unregister(devs[i]); | |
115 | break; | |
116 | } | |
117 | } | |
118 | ||
119 | return ret; | |
120 | } | |
a96b2042 | 121 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 122 | |
37c12e74 RK |
123 | struct platform_object { |
124 | struct platform_device pdev; | |
125 | char name[1]; | |
126 | }; | |
127 | ||
1da177e4 | 128 | /** |
4a3ad20c GKH |
129 | * platform_device_put |
130 | * @pdev: platform device to free | |
37c12e74 | 131 | * |
4a3ad20c GKH |
132 | * Free all memory associated with a platform device. This function must |
133 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
134 | */ |
135 | void platform_device_put(struct platform_device *pdev) | |
136 | { | |
137 | if (pdev) | |
138 | put_device(&pdev->dev); | |
139 | } | |
140 | EXPORT_SYMBOL_GPL(platform_device_put); | |
141 | ||
142 | static void platform_device_release(struct device *dev) | |
143 | { | |
4a3ad20c GKH |
144 | struct platform_object *pa = container_of(dev, struct platform_object, |
145 | pdev.dev); | |
37c12e74 RK |
146 | |
147 | kfree(pa->pdev.dev.platform_data); | |
148 | kfree(pa->pdev.resource); | |
149 | kfree(pa); | |
150 | } | |
151 | ||
152 | /** | |
4a3ad20c GKH |
153 | * platform_device_alloc |
154 | * @name: base name of the device we're adding | |
155 | * @id: instance id | |
37c12e74 | 156 | * |
4a3ad20c GKH |
157 | * Create a platform device object which can have other objects attached |
158 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 159 | */ |
1359555e | 160 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
161 | { |
162 | struct platform_object *pa; | |
163 | ||
164 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); | |
165 | if (pa) { | |
166 | strcpy(pa->name, name); | |
167 | pa->pdev.name = pa->name; | |
168 | pa->pdev.id = id; | |
169 | device_initialize(&pa->pdev.dev); | |
170 | pa->pdev.dev.release = platform_device_release; | |
171 | } | |
172 | ||
93ce3061 | 173 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
174 | } |
175 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
176 | ||
177 | /** | |
4a3ad20c GKH |
178 | * platform_device_add_resources |
179 | * @pdev: platform device allocated by platform_device_alloc to add resources to | |
180 | * @res: set of resources that needs to be allocated for the device | |
181 | * @num: number of resources | |
37c12e74 | 182 | * |
4a3ad20c GKH |
183 | * Add a copy of the resources to the platform device. The memory |
184 | * associated with the resources will be freed when the platform device is | |
185 | * released. | |
37c12e74 | 186 | */ |
4a3ad20c GKH |
187 | int platform_device_add_resources(struct platform_device *pdev, |
188 | struct resource *res, unsigned int num) | |
37c12e74 RK |
189 | { |
190 | struct resource *r; | |
191 | ||
192 | r = kmalloc(sizeof(struct resource) * num, GFP_KERNEL); | |
193 | if (r) { | |
194 | memcpy(r, res, sizeof(struct resource) * num); | |
195 | pdev->resource = r; | |
196 | pdev->num_resources = num; | |
197 | } | |
198 | return r ? 0 : -ENOMEM; | |
199 | } | |
200 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
201 | ||
202 | /** | |
4a3ad20c GKH |
203 | * platform_device_add_data |
204 | * @pdev: platform device allocated by platform_device_alloc to add resources to | |
205 | * @data: platform specific data for this platform device | |
206 | * @size: size of platform specific data | |
37c12e74 | 207 | * |
4a3ad20c GKH |
208 | * Add a copy of platform specific data to the platform device's |
209 | * platform_data pointer. The memory associated with the platform data | |
210 | * will be freed when the platform device is released. | |
37c12e74 | 211 | */ |
4a3ad20c GKH |
212 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
213 | size_t size) | |
37c12e74 RK |
214 | { |
215 | void *d; | |
216 | ||
217 | d = kmalloc(size, GFP_KERNEL); | |
218 | if (d) { | |
219 | memcpy(d, data, size); | |
220 | pdev->dev.platform_data = d; | |
221 | } | |
222 | return d ? 0 : -ENOMEM; | |
223 | } | |
224 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
225 | ||
226 | /** | |
4a3ad20c GKH |
227 | * platform_device_add - add a platform device to device hierarchy |
228 | * @pdev: platform device we're adding | |
1da177e4 | 229 | * |
4a3ad20c GKH |
230 | * This is part 2 of platform_device_register(), though may be called |
231 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 232 | */ |
37c12e74 | 233 | int platform_device_add(struct platform_device *pdev) |
1da177e4 LT |
234 | { |
235 | int i, ret = 0; | |
236 | ||
237 | if (!pdev) | |
238 | return -EINVAL; | |
239 | ||
240 | if (!pdev->dev.parent) | |
241 | pdev->dev.parent = &platform_bus; | |
242 | ||
243 | pdev->dev.bus = &platform_bus_type; | |
244 | ||
245 | if (pdev->id != -1) | |
1e0b2cf9 | 246 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
1da177e4 | 247 | else |
acc0e90f | 248 | dev_set_name(&pdev->dev, "%s", pdev->name); |
1da177e4 LT |
249 | |
250 | for (i = 0; i < pdev->num_resources; i++) { | |
251 | struct resource *p, *r = &pdev->resource[i]; | |
252 | ||
253 | if (r->name == NULL) | |
1e0b2cf9 | 254 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
255 | |
256 | p = r->parent; | |
257 | if (!p) { | |
c9f66169 | 258 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 259 | p = &iomem_resource; |
c9f66169 | 260 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
261 | p = &ioport_resource; |
262 | } | |
263 | ||
d960bb4d | 264 | if (p && insert_resource(p, r)) { |
1da177e4 LT |
265 | printk(KERN_ERR |
266 | "%s: failed to claim resource %d\n", | |
1e0b2cf9 | 267 | dev_name(&pdev->dev), i); |
1da177e4 LT |
268 | ret = -EBUSY; |
269 | goto failed; | |
270 | } | |
271 | } | |
272 | ||
273 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 274 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 275 | |
e3915532 | 276 | ret = device_add(&pdev->dev); |
1da177e4 LT |
277 | if (ret == 0) |
278 | return ret; | |
279 | ||
280 | failed: | |
c9f66169 MD |
281 | while (--i >= 0) { |
282 | struct resource *r = &pdev->resource[i]; | |
283 | unsigned long type = resource_type(r); | |
284 | ||
285 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
286 | release_resource(r); | |
287 | } | |
288 | ||
1da177e4 LT |
289 | return ret; |
290 | } | |
37c12e74 RK |
291 | EXPORT_SYMBOL_GPL(platform_device_add); |
292 | ||
293 | /** | |
4a3ad20c GKH |
294 | * platform_device_del - remove a platform-level device |
295 | * @pdev: platform device we're removing | |
1da177e4 | 296 | * |
4a3ad20c GKH |
297 | * Note that this function will also release all memory- and port-based |
298 | * resources owned by the device (@dev->resource). This function must | |
299 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 300 | */ |
93ce3061 | 301 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
302 | { |
303 | int i; | |
304 | ||
305 | if (pdev) { | |
dc4c15d4 JD |
306 | device_del(&pdev->dev); |
307 | ||
1da177e4 LT |
308 | for (i = 0; i < pdev->num_resources; i++) { |
309 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
310 | unsigned long type = resource_type(r); |
311 | ||
312 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
313 | release_resource(r); |
314 | } | |
1da177e4 LT |
315 | } |
316 | } | |
93ce3061 DT |
317 | EXPORT_SYMBOL_GPL(platform_device_del); |
318 | ||
319 | /** | |
4a3ad20c GKH |
320 | * platform_device_register - add a platform-level device |
321 | * @pdev: platform device we're adding | |
93ce3061 | 322 | */ |
4a3ad20c | 323 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
324 | { |
325 | device_initialize(&pdev->dev); | |
326 | return platform_device_add(pdev); | |
327 | } | |
a96b2042 | 328 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
329 | |
330 | /** | |
4a3ad20c GKH |
331 | * platform_device_unregister - unregister a platform-level device |
332 | * @pdev: platform device we're unregistering | |
93ce3061 | 333 | * |
4a3ad20c GKH |
334 | * Unregistration is done in 2 steps. First we release all resources |
335 | * and remove it from the subsystem, then we drop reference count by | |
336 | * calling platform_device_put(). | |
93ce3061 | 337 | */ |
4a3ad20c | 338 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
339 | { |
340 | platform_device_del(pdev); | |
341 | platform_device_put(pdev); | |
342 | } | |
a96b2042 | 343 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 344 | |
1da177e4 | 345 | /** |
4a3ad20c GKH |
346 | * platform_device_register_simple |
347 | * @name: base name of the device we're adding | |
348 | * @id: instance id | |
349 | * @res: set of resources that needs to be allocated for the device | |
350 | * @num: number of resources | |
1da177e4 | 351 | * |
4a3ad20c GKH |
352 | * This function creates a simple platform device that requires minimal |
353 | * resource and memory management. Canned release function freeing memory | |
354 | * allocated for the device allows drivers using such devices to be | |
355 | * unloaded without waiting for the last reference to the device to be | |
356 | * dropped. | |
49a4ec18 | 357 | * |
4a3ad20c GKH |
358 | * This interface is primarily intended for use with legacy drivers which |
359 | * probe hardware directly. Because such drivers create sysfs device nodes | |
360 | * themselves, rather than letting system infrastructure handle such device | |
361 | * enumeration tasks, they don't fully conform to the Linux driver model. | |
362 | * In particular, when such drivers are built as modules, they can't be | |
363 | * "hotplugged". | |
1da177e4 | 364 | */ |
4a3ad20c GKH |
365 | struct platform_device *platform_device_register_simple(const char *name, |
366 | int id, | |
367 | struct resource *res, | |
368 | unsigned int num) | |
1da177e4 | 369 | { |
37c12e74 | 370 | struct platform_device *pdev; |
1da177e4 LT |
371 | int retval; |
372 | ||
37c12e74 RK |
373 | pdev = platform_device_alloc(name, id); |
374 | if (!pdev) { | |
1da177e4 LT |
375 | retval = -ENOMEM; |
376 | goto error; | |
377 | } | |
378 | ||
1da177e4 | 379 | if (num) { |
37c12e74 RK |
380 | retval = platform_device_add_resources(pdev, res, num); |
381 | if (retval) | |
382 | goto error; | |
1da177e4 LT |
383 | } |
384 | ||
37c12e74 | 385 | retval = platform_device_add(pdev); |
1da177e4 LT |
386 | if (retval) |
387 | goto error; | |
388 | ||
37c12e74 | 389 | return pdev; |
1da177e4 LT |
390 | |
391 | error: | |
37c12e74 | 392 | platform_device_put(pdev); |
1da177e4 LT |
393 | return ERR_PTR(retval); |
394 | } | |
a96b2042 | 395 | EXPORT_SYMBOL_GPL(platform_device_register_simple); |
1da177e4 | 396 | |
d8bf2540 DB |
397 | /** |
398 | * platform_device_register_data | |
399 | * @parent: parent device for the device we're adding | |
400 | * @name: base name of the device we're adding | |
401 | * @id: instance id | |
402 | * @data: platform specific data for this platform device | |
403 | * @size: size of platform specific data | |
404 | * | |
405 | * This function creates a simple platform device that requires minimal | |
406 | * resource and memory management. Canned release function freeing memory | |
407 | * allocated for the device allows drivers using such devices to be | |
408 | * unloaded without waiting for the last reference to the device to be | |
409 | * dropped. | |
410 | */ | |
411 | struct platform_device *platform_device_register_data( | |
412 | struct device *parent, | |
413 | const char *name, int id, | |
414 | const void *data, size_t size) | |
415 | { | |
416 | struct platform_device *pdev; | |
417 | int retval; | |
418 | ||
419 | pdev = platform_device_alloc(name, id); | |
420 | if (!pdev) { | |
421 | retval = -ENOMEM; | |
422 | goto error; | |
423 | } | |
424 | ||
425 | pdev->dev.parent = parent; | |
426 | ||
427 | if (size) { | |
428 | retval = platform_device_add_data(pdev, data, size); | |
429 | if (retval) | |
430 | goto error; | |
431 | } | |
432 | ||
433 | retval = platform_device_add(pdev); | |
434 | if (retval) | |
435 | goto error; | |
436 | ||
437 | return pdev; | |
438 | ||
439 | error: | |
440 | platform_device_put(pdev); | |
441 | return ERR_PTR(retval); | |
442 | } | |
443 | ||
00d3dcdd RK |
444 | static int platform_drv_probe(struct device *_dev) |
445 | { | |
446 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
447 | struct platform_device *dev = to_platform_device(_dev); | |
448 | ||
449 | return drv->probe(dev); | |
450 | } | |
451 | ||
c67334fb DB |
452 | static int platform_drv_probe_fail(struct device *_dev) |
453 | { | |
454 | return -ENXIO; | |
455 | } | |
456 | ||
00d3dcdd RK |
457 | static int platform_drv_remove(struct device *_dev) |
458 | { | |
459 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
460 | struct platform_device *dev = to_platform_device(_dev); | |
461 | ||
462 | return drv->remove(dev); | |
463 | } | |
464 | ||
465 | static void platform_drv_shutdown(struct device *_dev) | |
466 | { | |
467 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
468 | struct platform_device *dev = to_platform_device(_dev); | |
469 | ||
470 | drv->shutdown(dev); | |
471 | } | |
472 | ||
00d3dcdd | 473 | /** |
4a3ad20c GKH |
474 | * platform_driver_register |
475 | * @drv: platform driver structure | |
00d3dcdd RK |
476 | */ |
477 | int platform_driver_register(struct platform_driver *drv) | |
478 | { | |
479 | drv->driver.bus = &platform_bus_type; | |
480 | if (drv->probe) | |
481 | drv->driver.probe = platform_drv_probe; | |
482 | if (drv->remove) | |
483 | drv->driver.remove = platform_drv_remove; | |
484 | if (drv->shutdown) | |
485 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 486 | |
00d3dcdd RK |
487 | return driver_register(&drv->driver); |
488 | } | |
489 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
490 | ||
491 | /** | |
4a3ad20c GKH |
492 | * platform_driver_unregister |
493 | * @drv: platform driver structure | |
00d3dcdd RK |
494 | */ |
495 | void platform_driver_unregister(struct platform_driver *drv) | |
496 | { | |
497 | driver_unregister(&drv->driver); | |
498 | } | |
499 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
500 | ||
c67334fb DB |
501 | /** |
502 | * platform_driver_probe - register driver for non-hotpluggable device | |
503 | * @drv: platform driver structure | |
504 | * @probe: the driver probe routine, probably from an __init section | |
505 | * | |
506 | * Use this instead of platform_driver_register() when you know the device | |
507 | * is not hotpluggable and has already been registered, and you want to | |
508 | * remove its run-once probe() infrastructure from memory after the driver | |
509 | * has bound to the device. | |
510 | * | |
511 | * One typical use for this would be with drivers for controllers integrated | |
512 | * into system-on-chip processors, where the controller devices have been | |
513 | * configured as part of board setup. | |
514 | * | |
515 | * Returns zero if the driver registered and bound to a device, else returns | |
516 | * a negative error code and with the driver not registered. | |
517 | */ | |
c63e0783 | 518 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
519 | int (*probe)(struct platform_device *)) |
520 | { | |
521 | int retval, code; | |
522 | ||
523 | /* temporary section violation during probe() */ | |
524 | drv->probe = probe; | |
525 | retval = code = platform_driver_register(drv); | |
526 | ||
527 | /* Fixup that section violation, being paranoid about code scanning | |
528 | * the list of drivers in order to probe new devices. Check to see | |
529 | * if the probe was successful, and make sure any forced probes of | |
530 | * new devices fail. | |
531 | */ | |
c6f7e72a | 532 | spin_lock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb | 533 | drv->probe = NULL; |
e5dd1278 | 534 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
535 | retval = -ENODEV; |
536 | drv->driver.probe = platform_drv_probe_fail; | |
c6f7e72a | 537 | spin_unlock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb DB |
538 | |
539 | if (code != retval) | |
540 | platform_driver_unregister(drv); | |
541 | return retval; | |
542 | } | |
543 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 544 | |
a0245f7a DB |
545 | /* modalias support enables more hands-off userspace setup: |
546 | * (a) environment variable lets new-style hotplug events work once system is | |
547 | * fully running: "modprobe $MODALIAS" | |
548 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
549 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
550 | */ | |
4a3ad20c GKH |
551 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
552 | char *buf) | |
a0245f7a DB |
553 | { |
554 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 555 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
556 | |
557 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
558 | } | |
559 | ||
560 | static struct device_attribute platform_dev_attrs[] = { | |
561 | __ATTR_RO(modalias), | |
562 | __ATTR_NULL, | |
563 | }; | |
564 | ||
7eff2e7a | 565 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
566 | { |
567 | struct platform_device *pdev = to_platform_device(dev); | |
568 | ||
57fee4a5 EM |
569 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
570 | (pdev->id_entry) ? pdev->id_entry->name : pdev->name); | |
a0245f7a DB |
571 | return 0; |
572 | } | |
573 | ||
57fee4a5 EM |
574 | static const struct platform_device_id *platform_match_id( |
575 | struct platform_device_id *id, | |
576 | struct platform_device *pdev) | |
577 | { | |
578 | while (id->name[0]) { | |
579 | if (strcmp(pdev->name, id->name) == 0) { | |
580 | pdev->id_entry = id; | |
581 | return id; | |
582 | } | |
583 | id++; | |
584 | } | |
585 | return NULL; | |
586 | } | |
587 | ||
1da177e4 | 588 | /** |
4a3ad20c GKH |
589 | * platform_match - bind platform device to platform driver. |
590 | * @dev: device. | |
591 | * @drv: driver. | |
1da177e4 | 592 | * |
4a3ad20c GKH |
593 | * Platform device IDs are assumed to be encoded like this: |
594 | * "<name><instance>", where <name> is a short description of the type of | |
595 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
596 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
597 | * "<name>". So, extract the <name> from the platform_device structure, | |
598 | * and compare it against the name of the driver. Return whether they match | |
599 | * or not. | |
1da177e4 | 600 | */ |
4a3ad20c | 601 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 602 | { |
71b3e0c1 | 603 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
604 | struct platform_driver *pdrv = to_platform_driver(drv); |
605 | ||
606 | /* match against the id table first */ | |
607 | if (pdrv->id_table) | |
608 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 609 | |
57fee4a5 | 610 | /* fall-back to driver name match */ |
1e0b2cf9 | 611 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
612 | } |
613 | ||
25e18499 RW |
614 | #ifdef CONFIG_PM_SLEEP |
615 | ||
616 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 617 | { |
783ea7d4 MD |
618 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
619 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
620 | int ret = 0; |
621 | ||
783ea7d4 MD |
622 | if (dev->driver && pdrv->suspend) |
623 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
624 | |
625 | return ret; | |
626 | } | |
627 | ||
25e18499 | 628 | static int platform_legacy_suspend_late(struct device *dev, pm_message_t mesg) |
386415d8 | 629 | { |
71b3e0c1 EM |
630 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
631 | struct platform_device *pdev = to_platform_device(dev); | |
386415d8 DB |
632 | int ret = 0; |
633 | ||
71b3e0c1 EM |
634 | if (dev->driver && pdrv->suspend_late) |
635 | ret = pdrv->suspend_late(pdev, mesg); | |
386415d8 DB |
636 | |
637 | return ret; | |
638 | } | |
639 | ||
25e18499 | 640 | static int platform_legacy_resume_early(struct device *dev) |
386415d8 | 641 | { |
71b3e0c1 EM |
642 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
643 | struct platform_device *pdev = to_platform_device(dev); | |
386415d8 DB |
644 | int ret = 0; |
645 | ||
71b3e0c1 EM |
646 | if (dev->driver && pdrv->resume_early) |
647 | ret = pdrv->resume_early(pdev); | |
9480e307 | 648 | |
1da177e4 LT |
649 | return ret; |
650 | } | |
651 | ||
25e18499 | 652 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 653 | { |
783ea7d4 MD |
654 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
655 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
656 | int ret = 0; |
657 | ||
783ea7d4 MD |
658 | if (dev->driver && pdrv->resume) |
659 | ret = pdrv->resume(pdev); | |
9480e307 | 660 | |
1da177e4 LT |
661 | return ret; |
662 | } | |
663 | ||
25e18499 RW |
664 | static int platform_pm_prepare(struct device *dev) |
665 | { | |
666 | struct device_driver *drv = dev->driver; | |
667 | int ret = 0; | |
668 | ||
669 | if (drv && drv->pm && drv->pm->prepare) | |
670 | ret = drv->pm->prepare(dev); | |
671 | ||
672 | return ret; | |
673 | } | |
674 | ||
675 | static void platform_pm_complete(struct device *dev) | |
676 | { | |
677 | struct device_driver *drv = dev->driver; | |
678 | ||
679 | if (drv && drv->pm && drv->pm->complete) | |
680 | drv->pm->complete(dev); | |
681 | } | |
682 | ||
683 | #ifdef CONFIG_SUSPEND | |
684 | ||
685 | static int platform_pm_suspend(struct device *dev) | |
686 | { | |
687 | struct device_driver *drv = dev->driver; | |
688 | int ret = 0; | |
689 | ||
adf09493 RW |
690 | if (!drv) |
691 | return 0; | |
692 | ||
693 | if (drv->pm) { | |
25e18499 RW |
694 | if (drv->pm->suspend) |
695 | ret = drv->pm->suspend(dev); | |
696 | } else { | |
697 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
698 | } | |
699 | ||
700 | return ret; | |
701 | } | |
702 | ||
703 | static int platform_pm_suspend_noirq(struct device *dev) | |
704 | { | |
adf09493 | 705 | struct device_driver *drv = dev->driver; |
25e18499 RW |
706 | int ret = 0; |
707 | ||
adf09493 | 708 | if (!drv) |
25e18499 RW |
709 | return 0; |
710 | ||
adf09493 RW |
711 | if (drv->pm) { |
712 | if (drv->pm->suspend_noirq) | |
713 | ret = drv->pm->suspend_noirq(dev); | |
25e18499 RW |
714 | } else { |
715 | ret = platform_legacy_suspend_late(dev, PMSG_SUSPEND); | |
716 | } | |
717 | ||
718 | return ret; | |
719 | } | |
720 | ||
721 | static int platform_pm_resume(struct device *dev) | |
722 | { | |
723 | struct device_driver *drv = dev->driver; | |
724 | int ret = 0; | |
725 | ||
adf09493 RW |
726 | if (!drv) |
727 | return 0; | |
728 | ||
729 | if (drv->pm) { | |
25e18499 RW |
730 | if (drv->pm->resume) |
731 | ret = drv->pm->resume(dev); | |
732 | } else { | |
733 | ret = platform_legacy_resume(dev); | |
734 | } | |
735 | ||
736 | return ret; | |
737 | } | |
738 | ||
739 | static int platform_pm_resume_noirq(struct device *dev) | |
740 | { | |
adf09493 | 741 | struct device_driver *drv = dev->driver; |
25e18499 RW |
742 | int ret = 0; |
743 | ||
adf09493 | 744 | if (!drv) |
25e18499 RW |
745 | return 0; |
746 | ||
adf09493 RW |
747 | if (drv->pm) { |
748 | if (drv->pm->resume_noirq) | |
749 | ret = drv->pm->resume_noirq(dev); | |
25e18499 RW |
750 | } else { |
751 | ret = platform_legacy_resume_early(dev); | |
752 | } | |
753 | ||
754 | return ret; | |
755 | } | |
756 | ||
757 | #else /* !CONFIG_SUSPEND */ | |
758 | ||
759 | #define platform_pm_suspend NULL | |
760 | #define platform_pm_resume NULL | |
761 | #define platform_pm_suspend_noirq NULL | |
762 | #define platform_pm_resume_noirq NULL | |
763 | ||
764 | #endif /* !CONFIG_SUSPEND */ | |
765 | ||
766 | #ifdef CONFIG_HIBERNATION | |
767 | ||
768 | static int platform_pm_freeze(struct device *dev) | |
769 | { | |
770 | struct device_driver *drv = dev->driver; | |
771 | int ret = 0; | |
772 | ||
773 | if (!drv) | |
774 | return 0; | |
775 | ||
776 | if (drv->pm) { | |
777 | if (drv->pm->freeze) | |
778 | ret = drv->pm->freeze(dev); | |
779 | } else { | |
780 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
781 | } | |
782 | ||
783 | return ret; | |
784 | } | |
785 | ||
786 | static int platform_pm_freeze_noirq(struct device *dev) | |
787 | { | |
adf09493 | 788 | struct device_driver *drv = dev->driver; |
25e18499 RW |
789 | int ret = 0; |
790 | ||
adf09493 | 791 | if (!drv) |
25e18499 RW |
792 | return 0; |
793 | ||
adf09493 RW |
794 | if (drv->pm) { |
795 | if (drv->pm->freeze_noirq) | |
796 | ret = drv->pm->freeze_noirq(dev); | |
25e18499 RW |
797 | } else { |
798 | ret = platform_legacy_suspend_late(dev, PMSG_FREEZE); | |
799 | } | |
800 | ||
801 | return ret; | |
802 | } | |
803 | ||
804 | static int platform_pm_thaw(struct device *dev) | |
805 | { | |
806 | struct device_driver *drv = dev->driver; | |
807 | int ret = 0; | |
808 | ||
adf09493 RW |
809 | if (!drv) |
810 | return 0; | |
811 | ||
812 | if (drv->pm) { | |
25e18499 RW |
813 | if (drv->pm->thaw) |
814 | ret = drv->pm->thaw(dev); | |
815 | } else { | |
816 | ret = platform_legacy_resume(dev); | |
817 | } | |
818 | ||
819 | return ret; | |
820 | } | |
821 | ||
822 | static int platform_pm_thaw_noirq(struct device *dev) | |
823 | { | |
adf09493 | 824 | struct device_driver *drv = dev->driver; |
25e18499 RW |
825 | int ret = 0; |
826 | ||
adf09493 | 827 | if (!drv) |
25e18499 RW |
828 | return 0; |
829 | ||
adf09493 RW |
830 | if (drv->pm) { |
831 | if (drv->pm->thaw_noirq) | |
832 | ret = drv->pm->thaw_noirq(dev); | |
25e18499 RW |
833 | } else { |
834 | ret = platform_legacy_resume_early(dev); | |
835 | } | |
836 | ||
837 | return ret; | |
838 | } | |
839 | ||
840 | static int platform_pm_poweroff(struct device *dev) | |
841 | { | |
842 | struct device_driver *drv = dev->driver; | |
843 | int ret = 0; | |
844 | ||
adf09493 RW |
845 | if (!drv) |
846 | return 0; | |
847 | ||
848 | if (drv->pm) { | |
25e18499 RW |
849 | if (drv->pm->poweroff) |
850 | ret = drv->pm->poweroff(dev); | |
851 | } else { | |
852 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
853 | } | |
854 | ||
855 | return ret; | |
856 | } | |
857 | ||
858 | static int platform_pm_poweroff_noirq(struct device *dev) | |
859 | { | |
adf09493 | 860 | struct device_driver *drv = dev->driver; |
25e18499 RW |
861 | int ret = 0; |
862 | ||
adf09493 | 863 | if (!drv) |
25e18499 RW |
864 | return 0; |
865 | ||
adf09493 RW |
866 | if (drv->pm) { |
867 | if (drv->pm->poweroff_noirq) | |
868 | ret = drv->pm->poweroff_noirq(dev); | |
25e18499 RW |
869 | } else { |
870 | ret = platform_legacy_suspend_late(dev, PMSG_HIBERNATE); | |
871 | } | |
872 | ||
873 | return ret; | |
874 | } | |
875 | ||
876 | static int platform_pm_restore(struct device *dev) | |
877 | { | |
878 | struct device_driver *drv = dev->driver; | |
879 | int ret = 0; | |
880 | ||
adf09493 RW |
881 | if (!drv) |
882 | return 0; | |
883 | ||
884 | if (drv->pm) { | |
25e18499 RW |
885 | if (drv->pm->restore) |
886 | ret = drv->pm->restore(dev); | |
887 | } else { | |
888 | ret = platform_legacy_resume(dev); | |
889 | } | |
890 | ||
891 | return ret; | |
892 | } | |
893 | ||
894 | static int platform_pm_restore_noirq(struct device *dev) | |
895 | { | |
adf09493 | 896 | struct device_driver *drv = dev->driver; |
25e18499 RW |
897 | int ret = 0; |
898 | ||
adf09493 | 899 | if (!drv) |
25e18499 RW |
900 | return 0; |
901 | ||
adf09493 RW |
902 | if (drv->pm) { |
903 | if (drv->pm->restore_noirq) | |
904 | ret = drv->pm->restore_noirq(dev); | |
25e18499 RW |
905 | } else { |
906 | ret = platform_legacy_resume_early(dev); | |
907 | } | |
908 | ||
909 | return ret; | |
910 | } | |
911 | ||
912 | #else /* !CONFIG_HIBERNATION */ | |
913 | ||
914 | #define platform_pm_freeze NULL | |
915 | #define platform_pm_thaw NULL | |
916 | #define platform_pm_poweroff NULL | |
917 | #define platform_pm_restore NULL | |
918 | #define platform_pm_freeze_noirq NULL | |
919 | #define platform_pm_thaw_noirq NULL | |
920 | #define platform_pm_poweroff_noirq NULL | |
921 | #define platform_pm_restore_noirq NULL | |
922 | ||
923 | #endif /* !CONFIG_HIBERNATION */ | |
924 | ||
adf09493 RW |
925 | static struct dev_pm_ops platform_dev_pm_ops = { |
926 | .prepare = platform_pm_prepare, | |
927 | .complete = platform_pm_complete, | |
928 | .suspend = platform_pm_suspend, | |
929 | .resume = platform_pm_resume, | |
930 | .freeze = platform_pm_freeze, | |
931 | .thaw = platform_pm_thaw, | |
932 | .poweroff = platform_pm_poweroff, | |
933 | .restore = platform_pm_restore, | |
25e18499 RW |
934 | .suspend_noirq = platform_pm_suspend_noirq, |
935 | .resume_noirq = platform_pm_resume_noirq, | |
936 | .freeze_noirq = platform_pm_freeze_noirq, | |
937 | .thaw_noirq = platform_pm_thaw_noirq, | |
938 | .poweroff_noirq = platform_pm_poweroff_noirq, | |
939 | .restore_noirq = platform_pm_restore_noirq, | |
940 | }; | |
941 | ||
adf09493 | 942 | #define PLATFORM_PM_OPS_PTR (&platform_dev_pm_ops) |
25e18499 RW |
943 | |
944 | #else /* !CONFIG_PM_SLEEP */ | |
945 | ||
946 | #define PLATFORM_PM_OPS_PTR NULL | |
947 | ||
948 | #endif /* !CONFIG_PM_SLEEP */ | |
949 | ||
1da177e4 LT |
950 | struct bus_type platform_bus_type = { |
951 | .name = "platform", | |
a0245f7a | 952 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 953 | .match = platform_match, |
a0245f7a | 954 | .uevent = platform_uevent, |
25e18499 | 955 | .pm = PLATFORM_PM_OPS_PTR, |
1da177e4 | 956 | }; |
a96b2042 | 957 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
958 | |
959 | int __init platform_bus_init(void) | |
960 | { | |
fbfb1445 CH |
961 | int error; |
962 | ||
13977091 MD |
963 | early_platform_cleanup(); |
964 | ||
fbfb1445 CH |
965 | error = device_register(&platform_bus); |
966 | if (error) | |
967 | return error; | |
968 | error = bus_register(&platform_bus_type); | |
969 | if (error) | |
970 | device_unregister(&platform_bus); | |
971 | return error; | |
1da177e4 LT |
972 | } |
973 | ||
974 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
975 | u64 dma_get_required_mask(struct device *dev) | |
976 | { | |
977 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
978 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
979 | u64 mask; | |
980 | ||
981 | if (!high_totalram) { | |
982 | /* convert to mask just covering totalram */ | |
983 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
984 | low_totalram += low_totalram - 1; | |
985 | mask = low_totalram; | |
986 | } else { | |
987 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
988 | high_totalram += high_totalram - 1; | |
989 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
990 | } | |
e88a0c2c | 991 | return mask; |
1da177e4 LT |
992 | } |
993 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
994 | #endif | |
13977091 MD |
995 | |
996 | static __initdata LIST_HEAD(early_platform_driver_list); | |
997 | static __initdata LIST_HEAD(early_platform_device_list); | |
998 | ||
999 | /** | |
1000 | * early_platform_driver_register | |
d86c1302 | 1001 | * @epdrv: early_platform driver structure |
13977091 MD |
1002 | * @buf: string passed from early_param() |
1003 | */ | |
1004 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
1005 | char *buf) | |
1006 | { | |
1007 | unsigned long index; | |
1008 | int n; | |
1009 | ||
1010 | /* Simply add the driver to the end of the global list. | |
1011 | * Drivers will by default be put on the list in compiled-in order. | |
1012 | */ | |
1013 | if (!epdrv->list.next) { | |
1014 | INIT_LIST_HEAD(&epdrv->list); | |
1015 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
1016 | } | |
1017 | ||
1018 | /* If the user has specified device then make sure the driver | |
1019 | * gets prioritized. The driver of the last device specified on | |
1020 | * command line will be put first on the list. | |
1021 | */ | |
1022 | n = strlen(epdrv->pdrv->driver.name); | |
1023 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
1024 | list_move(&epdrv->list, &early_platform_driver_list); | |
1025 | ||
1026 | if (!strcmp(buf, epdrv->pdrv->driver.name)) | |
1027 | epdrv->requested_id = -1; | |
1028 | else if (buf[n] == '.' && strict_strtoul(&buf[n + 1], 10, | |
1029 | &index) == 0) | |
1030 | epdrv->requested_id = index; | |
1031 | else | |
1032 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
1033 | } | |
1034 | ||
1035 | return 0; | |
1036 | } | |
1037 | ||
1038 | /** | |
1039 | * early_platform_add_devices - add a numbers of early platform devices | |
1040 | * @devs: array of early platform devices to add | |
1041 | * @num: number of early platform devices in array | |
1042 | */ | |
1043 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1044 | { | |
1045 | struct device *dev; | |
1046 | int i; | |
1047 | ||
1048 | /* simply add the devices to list */ | |
1049 | for (i = 0; i < num; i++) { | |
1050 | dev = &devs[i]->dev; | |
1051 | ||
1052 | if (!dev->devres_head.next) { | |
1053 | INIT_LIST_HEAD(&dev->devres_head); | |
1054 | list_add_tail(&dev->devres_head, | |
1055 | &early_platform_device_list); | |
1056 | } | |
1057 | } | |
1058 | } | |
1059 | ||
1060 | /** | |
1061 | * early_platform_driver_register_all | |
1062 | * @class_str: string to identify early platform driver class | |
1063 | */ | |
1064 | void __init early_platform_driver_register_all(char *class_str) | |
1065 | { | |
1066 | /* The "class_str" parameter may or may not be present on the kernel | |
1067 | * command line. If it is present then there may be more than one | |
1068 | * matching parameter. | |
1069 | * | |
1070 | * Since we register our early platform drivers using early_param() | |
1071 | * we need to make sure that they also get registered in the case | |
1072 | * when the parameter is missing from the kernel command line. | |
1073 | * | |
1074 | * We use parse_early_options() to make sure the early_param() gets | |
1075 | * called at least once. The early_param() may be called more than | |
1076 | * once since the name of the preferred device may be specified on | |
1077 | * the kernel command line. early_platform_driver_register() handles | |
1078 | * this case for us. | |
1079 | */ | |
1080 | parse_early_options(class_str); | |
1081 | } | |
1082 | ||
1083 | /** | |
1084 | * early_platform_match | |
d86c1302 | 1085 | * @epdrv: early platform driver structure |
13977091 MD |
1086 | * @id: id to match against |
1087 | */ | |
1088 | static __init struct platform_device * | |
1089 | early_platform_match(struct early_platform_driver *epdrv, int id) | |
1090 | { | |
1091 | struct platform_device *pd; | |
1092 | ||
1093 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1094 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1095 | if (pd->id == id) | |
1096 | return pd; | |
1097 | ||
1098 | return NULL; | |
1099 | } | |
1100 | ||
1101 | /** | |
1102 | * early_platform_left | |
d86c1302 | 1103 | * @epdrv: early platform driver structure |
13977091 MD |
1104 | * @id: return true if id or above exists |
1105 | */ | |
1106 | static __init int early_platform_left(struct early_platform_driver *epdrv, | |
1107 | int id) | |
1108 | { | |
1109 | struct platform_device *pd; | |
1110 | ||
1111 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1112 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1113 | if (pd->id >= id) | |
1114 | return 1; | |
1115 | ||
1116 | return 0; | |
1117 | } | |
1118 | ||
1119 | /** | |
1120 | * early_platform_driver_probe_id | |
1121 | * @class_str: string to identify early platform driver class | |
1122 | * @id: id to match against | |
1123 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1124 | */ | |
1125 | static int __init early_platform_driver_probe_id(char *class_str, | |
1126 | int id, | |
1127 | int nr_probe) | |
1128 | { | |
1129 | struct early_platform_driver *epdrv; | |
1130 | struct platform_device *match; | |
1131 | int match_id; | |
1132 | int n = 0; | |
1133 | int left = 0; | |
1134 | ||
1135 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1136 | /* only use drivers matching our class_str */ | |
1137 | if (strcmp(class_str, epdrv->class_str)) | |
1138 | continue; | |
1139 | ||
1140 | if (id == -2) { | |
1141 | match_id = epdrv->requested_id; | |
1142 | left = 1; | |
1143 | ||
1144 | } else { | |
1145 | match_id = id; | |
1146 | left += early_platform_left(epdrv, id); | |
1147 | ||
1148 | /* skip requested id */ | |
1149 | switch (epdrv->requested_id) { | |
1150 | case EARLY_PLATFORM_ID_ERROR: | |
1151 | case EARLY_PLATFORM_ID_UNSET: | |
1152 | break; | |
1153 | default: | |
1154 | if (epdrv->requested_id == id) | |
1155 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | switch (match_id) { | |
1160 | case EARLY_PLATFORM_ID_ERROR: | |
1161 | pr_warning("%s: unable to parse %s parameter\n", | |
1162 | class_str, epdrv->pdrv->driver.name); | |
1163 | /* fall-through */ | |
1164 | case EARLY_PLATFORM_ID_UNSET: | |
1165 | match = NULL; | |
1166 | break; | |
1167 | default: | |
1168 | match = early_platform_match(epdrv, match_id); | |
1169 | } | |
1170 | ||
1171 | if (match) { | |
1172 | if (epdrv->pdrv->probe(match)) | |
1173 | pr_warning("%s: unable to probe %s early.\n", | |
1174 | class_str, match->name); | |
1175 | else | |
1176 | n++; | |
1177 | } | |
1178 | ||
1179 | if (n >= nr_probe) | |
1180 | break; | |
1181 | } | |
1182 | ||
1183 | if (left) | |
1184 | return n; | |
1185 | else | |
1186 | return -ENODEV; | |
1187 | } | |
1188 | ||
1189 | /** | |
1190 | * early_platform_driver_probe | |
1191 | * @class_str: string to identify early platform driver class | |
1192 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1193 | * @user_only: only probe user specified early platform devices | |
1194 | */ | |
1195 | int __init early_platform_driver_probe(char *class_str, | |
1196 | int nr_probe, | |
1197 | int user_only) | |
1198 | { | |
1199 | int k, n, i; | |
1200 | ||
1201 | n = 0; | |
1202 | for (i = -2; n < nr_probe; i++) { | |
1203 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1204 | ||
1205 | if (k < 0) | |
1206 | break; | |
1207 | ||
1208 | n += k; | |
1209 | ||
1210 | if (user_only) | |
1211 | break; | |
1212 | } | |
1213 | ||
1214 | return n; | |
1215 | } | |
1216 | ||
1217 | /** | |
1218 | * early_platform_cleanup - clean up early platform code | |
1219 | */ | |
1220 | void __init early_platform_cleanup(void) | |
1221 | { | |
1222 | struct platform_device *pd, *pd2; | |
1223 | ||
1224 | /* clean up the devres list used to chain devices */ | |
1225 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1226 | dev.devres_head) { | |
1227 | list_del(&pd->dev.devres_head); | |
1228 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1229 | } | |
1230 | } | |
1231 |