Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * platform.c - platform 'pseudo' bus for legacy devices | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * Please see Documentation/driver-model/platform.txt for more | |
10 | * information. | |
11 | */ | |
12 | ||
daa41226 | 13 | #include <linux/string.h> |
d052d1be | 14 | #include <linux/platform_device.h> |
1da177e4 LT |
15 | #include <linux/module.h> |
16 | #include <linux/init.h> | |
17 | #include <linux/dma-mapping.h> | |
18 | #include <linux/bootmem.h> | |
19 | #include <linux/err.h> | |
4e57b681 | 20 | #include <linux/slab.h> |
9d730229 | 21 | #include <linux/pm_runtime.h> |
1da177e4 | 22 | |
a1bdc7aa BD |
23 | #include "base.h" |
24 | ||
4a3ad20c GKH |
25 | #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \ |
26 | driver)) | |
00d3dcdd | 27 | |
1da177e4 | 28 | struct device platform_bus = { |
1e0b2cf9 | 29 | .init_name = "platform", |
1da177e4 | 30 | }; |
a96b2042 | 31 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 LT |
32 | |
33 | /** | |
4a3ad20c GKH |
34 | * platform_get_resource - get a resource for a device |
35 | * @dev: platform device | |
36 | * @type: resource type | |
37 | * @num: resource index | |
1da177e4 | 38 | */ |
4a3ad20c GKH |
39 | struct resource *platform_get_resource(struct platform_device *dev, |
40 | unsigned int type, unsigned int num) | |
1da177e4 LT |
41 | { |
42 | int i; | |
43 | ||
44 | for (i = 0; i < dev->num_resources; i++) { | |
45 | struct resource *r = &dev->resource[i]; | |
46 | ||
c9f66169 MD |
47 | if (type == resource_type(r) && num-- == 0) |
48 | return r; | |
1da177e4 LT |
49 | } |
50 | return NULL; | |
51 | } | |
a96b2042 | 52 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
53 | |
54 | /** | |
4a3ad20c GKH |
55 | * platform_get_irq - get an IRQ for a device |
56 | * @dev: platform device | |
57 | * @num: IRQ number index | |
1da177e4 LT |
58 | */ |
59 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
60 | { | |
61 | struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
62 | ||
305b3228 | 63 | return r ? r->start : -ENXIO; |
1da177e4 | 64 | } |
a96b2042 | 65 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
66 | |
67 | /** | |
4a3ad20c GKH |
68 | * platform_get_resource_byname - get a resource for a device by name |
69 | * @dev: platform device | |
70 | * @type: resource type | |
71 | * @name: resource name | |
1da177e4 | 72 | */ |
4a3ad20c | 73 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
74 | unsigned int type, |
75 | const char *name) | |
1da177e4 LT |
76 | { |
77 | int i; | |
78 | ||
79 | for (i = 0; i < dev->num_resources; i++) { | |
80 | struct resource *r = &dev->resource[i]; | |
81 | ||
c9f66169 MD |
82 | if (type == resource_type(r) && !strcmp(r->name, name)) |
83 | return r; | |
1da177e4 LT |
84 | } |
85 | return NULL; | |
86 | } | |
a96b2042 | 87 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
88 | |
89 | /** | |
4a3ad20c GKH |
90 | * platform_get_irq - get an IRQ for a device |
91 | * @dev: platform device | |
92 | * @name: IRQ name | |
1da177e4 | 93 | */ |
c0afe7ba | 94 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
1da177e4 | 95 | { |
4a3ad20c GKH |
96 | struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, |
97 | name); | |
1da177e4 | 98 | |
305b3228 | 99 | return r ? r->start : -ENXIO; |
1da177e4 | 100 | } |
a96b2042 | 101 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
102 | |
103 | /** | |
4a3ad20c GKH |
104 | * platform_add_devices - add a numbers of platform devices |
105 | * @devs: array of platform devices to add | |
106 | * @num: number of platform devices in array | |
1da177e4 LT |
107 | */ |
108 | int platform_add_devices(struct platform_device **devs, int num) | |
109 | { | |
110 | int i, ret = 0; | |
111 | ||
112 | for (i = 0; i < num; i++) { | |
113 | ret = platform_device_register(devs[i]); | |
114 | if (ret) { | |
115 | while (--i >= 0) | |
116 | platform_device_unregister(devs[i]); | |
117 | break; | |
118 | } | |
119 | } | |
120 | ||
121 | return ret; | |
122 | } | |
a96b2042 | 123 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 124 | |
37c12e74 RK |
125 | struct platform_object { |
126 | struct platform_device pdev; | |
127 | char name[1]; | |
128 | }; | |
129 | ||
1da177e4 | 130 | /** |
4a3ad20c GKH |
131 | * platform_device_put |
132 | * @pdev: platform device to free | |
37c12e74 | 133 | * |
4a3ad20c GKH |
134 | * Free all memory associated with a platform device. This function must |
135 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
136 | */ |
137 | void platform_device_put(struct platform_device *pdev) | |
138 | { | |
139 | if (pdev) | |
140 | put_device(&pdev->dev); | |
141 | } | |
142 | EXPORT_SYMBOL_GPL(platform_device_put); | |
143 | ||
144 | static void platform_device_release(struct device *dev) | |
145 | { | |
4a3ad20c GKH |
146 | struct platform_object *pa = container_of(dev, struct platform_object, |
147 | pdev.dev); | |
37c12e74 RK |
148 | |
149 | kfree(pa->pdev.dev.platform_data); | |
150 | kfree(pa->pdev.resource); | |
151 | kfree(pa); | |
152 | } | |
153 | ||
154 | /** | |
4a3ad20c GKH |
155 | * platform_device_alloc |
156 | * @name: base name of the device we're adding | |
157 | * @id: instance id | |
37c12e74 | 158 | * |
4a3ad20c GKH |
159 | * Create a platform device object which can have other objects attached |
160 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 161 | */ |
1359555e | 162 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
163 | { |
164 | struct platform_object *pa; | |
165 | ||
166 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); | |
167 | if (pa) { | |
168 | strcpy(pa->name, name); | |
169 | pa->pdev.name = pa->name; | |
170 | pa->pdev.id = id; | |
171 | device_initialize(&pa->pdev.dev); | |
172 | pa->pdev.dev.release = platform_device_release; | |
173 | } | |
174 | ||
93ce3061 | 175 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
176 | } |
177 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
178 | ||
179 | /** | |
4a3ad20c GKH |
180 | * platform_device_add_resources |
181 | * @pdev: platform device allocated by platform_device_alloc to add resources to | |
182 | * @res: set of resources that needs to be allocated for the device | |
183 | * @num: number of resources | |
37c12e74 | 184 | * |
4a3ad20c GKH |
185 | * Add a copy of the resources to the platform device. The memory |
186 | * associated with the resources will be freed when the platform device is | |
187 | * released. | |
37c12e74 | 188 | */ |
4a3ad20c GKH |
189 | int platform_device_add_resources(struct platform_device *pdev, |
190 | struct resource *res, unsigned int num) | |
37c12e74 RK |
191 | { |
192 | struct resource *r; | |
193 | ||
194 | r = kmalloc(sizeof(struct resource) * num, GFP_KERNEL); | |
195 | if (r) { | |
196 | memcpy(r, res, sizeof(struct resource) * num); | |
197 | pdev->resource = r; | |
198 | pdev->num_resources = num; | |
199 | } | |
200 | return r ? 0 : -ENOMEM; | |
201 | } | |
202 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
203 | ||
204 | /** | |
4a3ad20c GKH |
205 | * platform_device_add_data |
206 | * @pdev: platform device allocated by platform_device_alloc to add resources to | |
207 | * @data: platform specific data for this platform device | |
208 | * @size: size of platform specific data | |
37c12e74 | 209 | * |
4a3ad20c GKH |
210 | * Add a copy of platform specific data to the platform device's |
211 | * platform_data pointer. The memory associated with the platform data | |
212 | * will be freed when the platform device is released. | |
37c12e74 | 213 | */ |
4a3ad20c GKH |
214 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
215 | size_t size) | |
37c12e74 | 216 | { |
daa41226 | 217 | void *d = kmemdup(data, size, GFP_KERNEL); |
37c12e74 | 218 | |
37c12e74 | 219 | if (d) { |
37c12e74 | 220 | pdev->dev.platform_data = d; |
daa41226 | 221 | return 0; |
37c12e74 | 222 | } |
daa41226 | 223 | return -ENOMEM; |
37c12e74 RK |
224 | } |
225 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
226 | ||
227 | /** | |
4a3ad20c GKH |
228 | * platform_device_add - add a platform device to device hierarchy |
229 | * @pdev: platform device we're adding | |
1da177e4 | 230 | * |
4a3ad20c GKH |
231 | * This is part 2 of platform_device_register(), though may be called |
232 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 233 | */ |
37c12e74 | 234 | int platform_device_add(struct platform_device *pdev) |
1da177e4 LT |
235 | { |
236 | int i, ret = 0; | |
237 | ||
238 | if (!pdev) | |
239 | return -EINVAL; | |
240 | ||
241 | if (!pdev->dev.parent) | |
242 | pdev->dev.parent = &platform_bus; | |
243 | ||
244 | pdev->dev.bus = &platform_bus_type; | |
245 | ||
246 | if (pdev->id != -1) | |
1e0b2cf9 | 247 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
1da177e4 | 248 | else |
acc0e90f | 249 | dev_set_name(&pdev->dev, "%s", pdev->name); |
1da177e4 LT |
250 | |
251 | for (i = 0; i < pdev->num_resources; i++) { | |
252 | struct resource *p, *r = &pdev->resource[i]; | |
253 | ||
254 | if (r->name == NULL) | |
1e0b2cf9 | 255 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
256 | |
257 | p = r->parent; | |
258 | if (!p) { | |
c9f66169 | 259 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 260 | p = &iomem_resource; |
c9f66169 | 261 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
262 | p = &ioport_resource; |
263 | } | |
264 | ||
d960bb4d | 265 | if (p && insert_resource(p, r)) { |
1da177e4 LT |
266 | printk(KERN_ERR |
267 | "%s: failed to claim resource %d\n", | |
1e0b2cf9 | 268 | dev_name(&pdev->dev), i); |
1da177e4 LT |
269 | ret = -EBUSY; |
270 | goto failed; | |
271 | } | |
272 | } | |
273 | ||
274 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 275 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 276 | |
e3915532 | 277 | ret = device_add(&pdev->dev); |
1da177e4 LT |
278 | if (ret == 0) |
279 | return ret; | |
280 | ||
281 | failed: | |
c9f66169 MD |
282 | while (--i >= 0) { |
283 | struct resource *r = &pdev->resource[i]; | |
284 | unsigned long type = resource_type(r); | |
285 | ||
286 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
287 | release_resource(r); | |
288 | } | |
289 | ||
1da177e4 LT |
290 | return ret; |
291 | } | |
37c12e74 RK |
292 | EXPORT_SYMBOL_GPL(platform_device_add); |
293 | ||
294 | /** | |
4a3ad20c GKH |
295 | * platform_device_del - remove a platform-level device |
296 | * @pdev: platform device we're removing | |
1da177e4 | 297 | * |
4a3ad20c GKH |
298 | * Note that this function will also release all memory- and port-based |
299 | * resources owned by the device (@dev->resource). This function must | |
300 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 301 | */ |
93ce3061 | 302 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
303 | { |
304 | int i; | |
305 | ||
306 | if (pdev) { | |
dc4c15d4 JD |
307 | device_del(&pdev->dev); |
308 | ||
1da177e4 LT |
309 | for (i = 0; i < pdev->num_resources; i++) { |
310 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
311 | unsigned long type = resource_type(r); |
312 | ||
313 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
314 | release_resource(r); |
315 | } | |
1da177e4 LT |
316 | } |
317 | } | |
93ce3061 DT |
318 | EXPORT_SYMBOL_GPL(platform_device_del); |
319 | ||
320 | /** | |
4a3ad20c GKH |
321 | * platform_device_register - add a platform-level device |
322 | * @pdev: platform device we're adding | |
93ce3061 | 323 | */ |
4a3ad20c | 324 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
325 | { |
326 | device_initialize(&pdev->dev); | |
327 | return platform_device_add(pdev); | |
328 | } | |
a96b2042 | 329 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
330 | |
331 | /** | |
4a3ad20c GKH |
332 | * platform_device_unregister - unregister a platform-level device |
333 | * @pdev: platform device we're unregistering | |
93ce3061 | 334 | * |
4a3ad20c GKH |
335 | * Unregistration is done in 2 steps. First we release all resources |
336 | * and remove it from the subsystem, then we drop reference count by | |
337 | * calling platform_device_put(). | |
93ce3061 | 338 | */ |
4a3ad20c | 339 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
340 | { |
341 | platform_device_del(pdev); | |
342 | platform_device_put(pdev); | |
343 | } | |
a96b2042 | 344 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 345 | |
1da177e4 | 346 | /** |
4a3ad20c GKH |
347 | * platform_device_register_simple |
348 | * @name: base name of the device we're adding | |
349 | * @id: instance id | |
350 | * @res: set of resources that needs to be allocated for the device | |
351 | * @num: number of resources | |
1da177e4 | 352 | * |
4a3ad20c GKH |
353 | * This function creates a simple platform device that requires minimal |
354 | * resource and memory management. Canned release function freeing memory | |
355 | * allocated for the device allows drivers using such devices to be | |
356 | * unloaded without waiting for the last reference to the device to be | |
357 | * dropped. | |
49a4ec18 | 358 | * |
4a3ad20c GKH |
359 | * This interface is primarily intended for use with legacy drivers which |
360 | * probe hardware directly. Because such drivers create sysfs device nodes | |
361 | * themselves, rather than letting system infrastructure handle such device | |
362 | * enumeration tasks, they don't fully conform to the Linux driver model. | |
363 | * In particular, when such drivers are built as modules, they can't be | |
364 | * "hotplugged". | |
1da177e4 | 365 | */ |
4a3ad20c GKH |
366 | struct platform_device *platform_device_register_simple(const char *name, |
367 | int id, | |
368 | struct resource *res, | |
369 | unsigned int num) | |
1da177e4 | 370 | { |
37c12e74 | 371 | struct platform_device *pdev; |
1da177e4 LT |
372 | int retval; |
373 | ||
37c12e74 RK |
374 | pdev = platform_device_alloc(name, id); |
375 | if (!pdev) { | |
1da177e4 LT |
376 | retval = -ENOMEM; |
377 | goto error; | |
378 | } | |
379 | ||
1da177e4 | 380 | if (num) { |
37c12e74 RK |
381 | retval = platform_device_add_resources(pdev, res, num); |
382 | if (retval) | |
383 | goto error; | |
1da177e4 LT |
384 | } |
385 | ||
37c12e74 | 386 | retval = platform_device_add(pdev); |
1da177e4 LT |
387 | if (retval) |
388 | goto error; | |
389 | ||
37c12e74 | 390 | return pdev; |
1da177e4 LT |
391 | |
392 | error: | |
37c12e74 | 393 | platform_device_put(pdev); |
1da177e4 LT |
394 | return ERR_PTR(retval); |
395 | } | |
a96b2042 | 396 | EXPORT_SYMBOL_GPL(platform_device_register_simple); |
1da177e4 | 397 | |
d8bf2540 DB |
398 | /** |
399 | * platform_device_register_data | |
400 | * @parent: parent device for the device we're adding | |
401 | * @name: base name of the device we're adding | |
402 | * @id: instance id | |
403 | * @data: platform specific data for this platform device | |
404 | * @size: size of platform specific data | |
405 | * | |
406 | * This function creates a simple platform device that requires minimal | |
407 | * resource and memory management. Canned release function freeing memory | |
408 | * allocated for the device allows drivers using such devices to be | |
409 | * unloaded without waiting for the last reference to the device to be | |
410 | * dropped. | |
411 | */ | |
412 | struct platform_device *platform_device_register_data( | |
413 | struct device *parent, | |
414 | const char *name, int id, | |
415 | const void *data, size_t size) | |
416 | { | |
417 | struct platform_device *pdev; | |
418 | int retval; | |
419 | ||
420 | pdev = platform_device_alloc(name, id); | |
421 | if (!pdev) { | |
422 | retval = -ENOMEM; | |
423 | goto error; | |
424 | } | |
425 | ||
426 | pdev->dev.parent = parent; | |
427 | ||
428 | if (size) { | |
429 | retval = platform_device_add_data(pdev, data, size); | |
430 | if (retval) | |
431 | goto error; | |
432 | } | |
433 | ||
434 | retval = platform_device_add(pdev); | |
435 | if (retval) | |
436 | goto error; | |
437 | ||
438 | return pdev; | |
439 | ||
440 | error: | |
441 | platform_device_put(pdev); | |
442 | return ERR_PTR(retval); | |
443 | } | |
0787fdf7 | 444 | EXPORT_SYMBOL_GPL(platform_device_register_data); |
d8bf2540 | 445 | |
00d3dcdd RK |
446 | static int platform_drv_probe(struct device *_dev) |
447 | { | |
448 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
449 | struct platform_device *dev = to_platform_device(_dev); | |
450 | ||
451 | return drv->probe(dev); | |
452 | } | |
453 | ||
c67334fb DB |
454 | static int platform_drv_probe_fail(struct device *_dev) |
455 | { | |
456 | return -ENXIO; | |
457 | } | |
458 | ||
00d3dcdd RK |
459 | static int platform_drv_remove(struct device *_dev) |
460 | { | |
461 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
462 | struct platform_device *dev = to_platform_device(_dev); | |
463 | ||
464 | return drv->remove(dev); | |
465 | } | |
466 | ||
467 | static void platform_drv_shutdown(struct device *_dev) | |
468 | { | |
469 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
470 | struct platform_device *dev = to_platform_device(_dev); | |
471 | ||
472 | drv->shutdown(dev); | |
473 | } | |
474 | ||
00d3dcdd | 475 | /** |
4a3ad20c GKH |
476 | * platform_driver_register |
477 | * @drv: platform driver structure | |
00d3dcdd RK |
478 | */ |
479 | int platform_driver_register(struct platform_driver *drv) | |
480 | { | |
481 | drv->driver.bus = &platform_bus_type; | |
482 | if (drv->probe) | |
483 | drv->driver.probe = platform_drv_probe; | |
484 | if (drv->remove) | |
485 | drv->driver.remove = platform_drv_remove; | |
486 | if (drv->shutdown) | |
487 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 488 | |
00d3dcdd RK |
489 | return driver_register(&drv->driver); |
490 | } | |
491 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
492 | ||
493 | /** | |
4a3ad20c GKH |
494 | * platform_driver_unregister |
495 | * @drv: platform driver structure | |
00d3dcdd RK |
496 | */ |
497 | void platform_driver_unregister(struct platform_driver *drv) | |
498 | { | |
499 | driver_unregister(&drv->driver); | |
500 | } | |
501 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
502 | ||
c67334fb DB |
503 | /** |
504 | * platform_driver_probe - register driver for non-hotpluggable device | |
505 | * @drv: platform driver structure | |
506 | * @probe: the driver probe routine, probably from an __init section | |
507 | * | |
508 | * Use this instead of platform_driver_register() when you know the device | |
509 | * is not hotpluggable and has already been registered, and you want to | |
510 | * remove its run-once probe() infrastructure from memory after the driver | |
511 | * has bound to the device. | |
512 | * | |
513 | * One typical use for this would be with drivers for controllers integrated | |
514 | * into system-on-chip processors, where the controller devices have been | |
515 | * configured as part of board setup. | |
516 | * | |
517 | * Returns zero if the driver registered and bound to a device, else returns | |
518 | * a negative error code and with the driver not registered. | |
519 | */ | |
c63e0783 | 520 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
521 | int (*probe)(struct platform_device *)) |
522 | { | |
523 | int retval, code; | |
524 | ||
1a6f2a75 DT |
525 | /* make sure driver won't have bind/unbind attributes */ |
526 | drv->driver.suppress_bind_attrs = true; | |
527 | ||
c67334fb DB |
528 | /* temporary section violation during probe() */ |
529 | drv->probe = probe; | |
530 | retval = code = platform_driver_register(drv); | |
531 | ||
1a6f2a75 DT |
532 | /* |
533 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
534 | * the list of drivers in order to probe new devices. Check to see |
535 | * if the probe was successful, and make sure any forced probes of | |
536 | * new devices fail. | |
537 | */ | |
c6f7e72a | 538 | spin_lock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb | 539 | drv->probe = NULL; |
e5dd1278 | 540 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
541 | retval = -ENODEV; |
542 | drv->driver.probe = platform_drv_probe_fail; | |
c6f7e72a | 543 | spin_unlock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb DB |
544 | |
545 | if (code != retval) | |
546 | platform_driver_unregister(drv); | |
547 | return retval; | |
548 | } | |
549 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 550 | |
a0245f7a DB |
551 | /* modalias support enables more hands-off userspace setup: |
552 | * (a) environment variable lets new-style hotplug events work once system is | |
553 | * fully running: "modprobe $MODALIAS" | |
554 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
555 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
556 | */ | |
4a3ad20c GKH |
557 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
558 | char *buf) | |
a0245f7a DB |
559 | { |
560 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 561 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
562 | |
563 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
564 | } | |
565 | ||
566 | static struct device_attribute platform_dev_attrs[] = { | |
567 | __ATTR_RO(modalias), | |
568 | __ATTR_NULL, | |
569 | }; | |
570 | ||
7eff2e7a | 571 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
572 | { |
573 | struct platform_device *pdev = to_platform_device(dev); | |
574 | ||
57fee4a5 EM |
575 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
576 | (pdev->id_entry) ? pdev->id_entry->name : pdev->name); | |
a0245f7a DB |
577 | return 0; |
578 | } | |
579 | ||
57fee4a5 EM |
580 | static const struct platform_device_id *platform_match_id( |
581 | struct platform_device_id *id, | |
582 | struct platform_device *pdev) | |
583 | { | |
584 | while (id->name[0]) { | |
585 | if (strcmp(pdev->name, id->name) == 0) { | |
586 | pdev->id_entry = id; | |
587 | return id; | |
588 | } | |
589 | id++; | |
590 | } | |
591 | return NULL; | |
592 | } | |
593 | ||
1da177e4 | 594 | /** |
4a3ad20c GKH |
595 | * platform_match - bind platform device to platform driver. |
596 | * @dev: device. | |
597 | * @drv: driver. | |
1da177e4 | 598 | * |
4a3ad20c GKH |
599 | * Platform device IDs are assumed to be encoded like this: |
600 | * "<name><instance>", where <name> is a short description of the type of | |
601 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
602 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
603 | * "<name>". So, extract the <name> from the platform_device structure, | |
604 | * and compare it against the name of the driver. Return whether they match | |
605 | * or not. | |
1da177e4 | 606 | */ |
4a3ad20c | 607 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 608 | { |
71b3e0c1 | 609 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
610 | struct platform_driver *pdrv = to_platform_driver(drv); |
611 | ||
612 | /* match against the id table first */ | |
613 | if (pdrv->id_table) | |
614 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 615 | |
57fee4a5 | 616 | /* fall-back to driver name match */ |
1e0b2cf9 | 617 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
618 | } |
619 | ||
25e18499 RW |
620 | #ifdef CONFIG_PM_SLEEP |
621 | ||
622 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 623 | { |
783ea7d4 MD |
624 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
625 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
626 | int ret = 0; |
627 | ||
783ea7d4 MD |
628 | if (dev->driver && pdrv->suspend) |
629 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
630 | |
631 | return ret; | |
632 | } | |
633 | ||
25e18499 | 634 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 635 | { |
783ea7d4 MD |
636 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
637 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
638 | int ret = 0; |
639 | ||
783ea7d4 MD |
640 | if (dev->driver && pdrv->resume) |
641 | ret = pdrv->resume(pdev); | |
9480e307 | 642 | |
1da177e4 LT |
643 | return ret; |
644 | } | |
645 | ||
25e18499 RW |
646 | static int platform_pm_prepare(struct device *dev) |
647 | { | |
648 | struct device_driver *drv = dev->driver; | |
649 | int ret = 0; | |
650 | ||
651 | if (drv && drv->pm && drv->pm->prepare) | |
652 | ret = drv->pm->prepare(dev); | |
653 | ||
654 | return ret; | |
655 | } | |
656 | ||
657 | static void platform_pm_complete(struct device *dev) | |
658 | { | |
659 | struct device_driver *drv = dev->driver; | |
660 | ||
661 | if (drv && drv->pm && drv->pm->complete) | |
662 | drv->pm->complete(dev); | |
663 | } | |
664 | ||
9d730229 MD |
665 | #else /* !CONFIG_PM_SLEEP */ |
666 | ||
667 | #define platform_pm_prepare NULL | |
668 | #define platform_pm_complete NULL | |
669 | ||
670 | #endif /* !CONFIG_PM_SLEEP */ | |
671 | ||
25e18499 RW |
672 | #ifdef CONFIG_SUSPEND |
673 | ||
674 | static int platform_pm_suspend(struct device *dev) | |
675 | { | |
676 | struct device_driver *drv = dev->driver; | |
677 | int ret = 0; | |
678 | ||
adf09493 RW |
679 | if (!drv) |
680 | return 0; | |
681 | ||
682 | if (drv->pm) { | |
25e18499 RW |
683 | if (drv->pm->suspend) |
684 | ret = drv->pm->suspend(dev); | |
685 | } else { | |
686 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
687 | } | |
688 | ||
689 | return ret; | |
690 | } | |
691 | ||
692 | static int platform_pm_suspend_noirq(struct device *dev) | |
693 | { | |
adf09493 | 694 | struct device_driver *drv = dev->driver; |
25e18499 RW |
695 | int ret = 0; |
696 | ||
adf09493 | 697 | if (!drv) |
25e18499 RW |
698 | return 0; |
699 | ||
adf09493 RW |
700 | if (drv->pm) { |
701 | if (drv->pm->suspend_noirq) | |
702 | ret = drv->pm->suspend_noirq(dev); | |
25e18499 RW |
703 | } |
704 | ||
705 | return ret; | |
706 | } | |
707 | ||
708 | static int platform_pm_resume(struct device *dev) | |
709 | { | |
710 | struct device_driver *drv = dev->driver; | |
711 | int ret = 0; | |
712 | ||
adf09493 RW |
713 | if (!drv) |
714 | return 0; | |
715 | ||
716 | if (drv->pm) { | |
25e18499 RW |
717 | if (drv->pm->resume) |
718 | ret = drv->pm->resume(dev); | |
719 | } else { | |
720 | ret = platform_legacy_resume(dev); | |
721 | } | |
722 | ||
723 | return ret; | |
724 | } | |
725 | ||
726 | static int platform_pm_resume_noirq(struct device *dev) | |
727 | { | |
adf09493 | 728 | struct device_driver *drv = dev->driver; |
25e18499 RW |
729 | int ret = 0; |
730 | ||
adf09493 | 731 | if (!drv) |
25e18499 RW |
732 | return 0; |
733 | ||
adf09493 RW |
734 | if (drv->pm) { |
735 | if (drv->pm->resume_noirq) | |
736 | ret = drv->pm->resume_noirq(dev); | |
25e18499 RW |
737 | } |
738 | ||
739 | return ret; | |
740 | } | |
741 | ||
742 | #else /* !CONFIG_SUSPEND */ | |
743 | ||
744 | #define platform_pm_suspend NULL | |
745 | #define platform_pm_resume NULL | |
746 | #define platform_pm_suspend_noirq NULL | |
747 | #define platform_pm_resume_noirq NULL | |
748 | ||
749 | #endif /* !CONFIG_SUSPEND */ | |
750 | ||
751 | #ifdef CONFIG_HIBERNATION | |
752 | ||
753 | static int platform_pm_freeze(struct device *dev) | |
754 | { | |
755 | struct device_driver *drv = dev->driver; | |
756 | int ret = 0; | |
757 | ||
758 | if (!drv) | |
759 | return 0; | |
760 | ||
761 | if (drv->pm) { | |
762 | if (drv->pm->freeze) | |
763 | ret = drv->pm->freeze(dev); | |
764 | } else { | |
765 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
766 | } | |
767 | ||
768 | return ret; | |
769 | } | |
770 | ||
771 | static int platform_pm_freeze_noirq(struct device *dev) | |
772 | { | |
adf09493 | 773 | struct device_driver *drv = dev->driver; |
25e18499 RW |
774 | int ret = 0; |
775 | ||
adf09493 | 776 | if (!drv) |
25e18499 RW |
777 | return 0; |
778 | ||
adf09493 RW |
779 | if (drv->pm) { |
780 | if (drv->pm->freeze_noirq) | |
781 | ret = drv->pm->freeze_noirq(dev); | |
25e18499 RW |
782 | } |
783 | ||
784 | return ret; | |
785 | } | |
786 | ||
787 | static int platform_pm_thaw(struct device *dev) | |
788 | { | |
789 | struct device_driver *drv = dev->driver; | |
790 | int ret = 0; | |
791 | ||
adf09493 RW |
792 | if (!drv) |
793 | return 0; | |
794 | ||
795 | if (drv->pm) { | |
25e18499 RW |
796 | if (drv->pm->thaw) |
797 | ret = drv->pm->thaw(dev); | |
798 | } else { | |
799 | ret = platform_legacy_resume(dev); | |
800 | } | |
801 | ||
802 | return ret; | |
803 | } | |
804 | ||
805 | static int platform_pm_thaw_noirq(struct device *dev) | |
806 | { | |
adf09493 | 807 | struct device_driver *drv = dev->driver; |
25e18499 RW |
808 | int ret = 0; |
809 | ||
adf09493 | 810 | if (!drv) |
25e18499 RW |
811 | return 0; |
812 | ||
adf09493 RW |
813 | if (drv->pm) { |
814 | if (drv->pm->thaw_noirq) | |
815 | ret = drv->pm->thaw_noirq(dev); | |
25e18499 RW |
816 | } |
817 | ||
818 | return ret; | |
819 | } | |
820 | ||
821 | static int platform_pm_poweroff(struct device *dev) | |
822 | { | |
823 | struct device_driver *drv = dev->driver; | |
824 | int ret = 0; | |
825 | ||
adf09493 RW |
826 | if (!drv) |
827 | return 0; | |
828 | ||
829 | if (drv->pm) { | |
25e18499 RW |
830 | if (drv->pm->poweroff) |
831 | ret = drv->pm->poweroff(dev); | |
832 | } else { | |
833 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
834 | } | |
835 | ||
836 | return ret; | |
837 | } | |
838 | ||
839 | static int platform_pm_poweroff_noirq(struct device *dev) | |
840 | { | |
adf09493 | 841 | struct device_driver *drv = dev->driver; |
25e18499 RW |
842 | int ret = 0; |
843 | ||
adf09493 | 844 | if (!drv) |
25e18499 RW |
845 | return 0; |
846 | ||
adf09493 RW |
847 | if (drv->pm) { |
848 | if (drv->pm->poweroff_noirq) | |
849 | ret = drv->pm->poweroff_noirq(dev); | |
25e18499 RW |
850 | } |
851 | ||
852 | return ret; | |
853 | } | |
854 | ||
855 | static int platform_pm_restore(struct device *dev) | |
856 | { | |
857 | struct device_driver *drv = dev->driver; | |
858 | int ret = 0; | |
859 | ||
adf09493 RW |
860 | if (!drv) |
861 | return 0; | |
862 | ||
863 | if (drv->pm) { | |
25e18499 RW |
864 | if (drv->pm->restore) |
865 | ret = drv->pm->restore(dev); | |
866 | } else { | |
867 | ret = platform_legacy_resume(dev); | |
868 | } | |
869 | ||
870 | return ret; | |
871 | } | |
872 | ||
873 | static int platform_pm_restore_noirq(struct device *dev) | |
874 | { | |
adf09493 | 875 | struct device_driver *drv = dev->driver; |
25e18499 RW |
876 | int ret = 0; |
877 | ||
adf09493 | 878 | if (!drv) |
25e18499 RW |
879 | return 0; |
880 | ||
adf09493 RW |
881 | if (drv->pm) { |
882 | if (drv->pm->restore_noirq) | |
883 | ret = drv->pm->restore_noirq(dev); | |
25e18499 RW |
884 | } |
885 | ||
886 | return ret; | |
887 | } | |
888 | ||
889 | #else /* !CONFIG_HIBERNATION */ | |
890 | ||
891 | #define platform_pm_freeze NULL | |
892 | #define platform_pm_thaw NULL | |
893 | #define platform_pm_poweroff NULL | |
894 | #define platform_pm_restore NULL | |
895 | #define platform_pm_freeze_noirq NULL | |
896 | #define platform_pm_thaw_noirq NULL | |
897 | #define platform_pm_poweroff_noirq NULL | |
898 | #define platform_pm_restore_noirq NULL | |
899 | ||
900 | #endif /* !CONFIG_HIBERNATION */ | |
901 | ||
9d730229 MD |
902 | #ifdef CONFIG_PM_RUNTIME |
903 | ||
904 | int __weak platform_pm_runtime_suspend(struct device *dev) | |
905 | { | |
906 | return -ENOSYS; | |
907 | }; | |
908 | ||
909 | int __weak platform_pm_runtime_resume(struct device *dev) | |
910 | { | |
911 | return -ENOSYS; | |
912 | }; | |
913 | ||
914 | int __weak platform_pm_runtime_idle(struct device *dev) | |
915 | { | |
916 | return -ENOSYS; | |
917 | }; | |
918 | ||
919 | #else /* !CONFIG_PM_RUNTIME */ | |
920 | ||
921 | #define platform_pm_runtime_suspend NULL | |
922 | #define platform_pm_runtime_resume NULL | |
923 | #define platform_pm_runtime_idle NULL | |
924 | ||
925 | #endif /* !CONFIG_PM_RUNTIME */ | |
926 | ||
d9ab7716 | 927 | static const struct dev_pm_ops platform_dev_pm_ops = { |
adf09493 RW |
928 | .prepare = platform_pm_prepare, |
929 | .complete = platform_pm_complete, | |
930 | .suspend = platform_pm_suspend, | |
931 | .resume = platform_pm_resume, | |
932 | .freeze = platform_pm_freeze, | |
933 | .thaw = platform_pm_thaw, | |
934 | .poweroff = platform_pm_poweroff, | |
935 | .restore = platform_pm_restore, | |
25e18499 RW |
936 | .suspend_noirq = platform_pm_suspend_noirq, |
937 | .resume_noirq = platform_pm_resume_noirq, | |
938 | .freeze_noirq = platform_pm_freeze_noirq, | |
939 | .thaw_noirq = platform_pm_thaw_noirq, | |
940 | .poweroff_noirq = platform_pm_poweroff_noirq, | |
941 | .restore_noirq = platform_pm_restore_noirq, | |
9d730229 MD |
942 | .runtime_suspend = platform_pm_runtime_suspend, |
943 | .runtime_resume = platform_pm_runtime_resume, | |
944 | .runtime_idle = platform_pm_runtime_idle, | |
25e18499 RW |
945 | }; |
946 | ||
1da177e4 LT |
947 | struct bus_type platform_bus_type = { |
948 | .name = "platform", | |
a0245f7a | 949 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 950 | .match = platform_match, |
a0245f7a | 951 | .uevent = platform_uevent, |
9d730229 | 952 | .pm = &platform_dev_pm_ops, |
1da177e4 | 953 | }; |
a96b2042 | 954 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
955 | |
956 | int __init platform_bus_init(void) | |
957 | { | |
fbfb1445 CH |
958 | int error; |
959 | ||
13977091 MD |
960 | early_platform_cleanup(); |
961 | ||
fbfb1445 CH |
962 | error = device_register(&platform_bus); |
963 | if (error) | |
964 | return error; | |
965 | error = bus_register(&platform_bus_type); | |
966 | if (error) | |
967 | device_unregister(&platform_bus); | |
968 | return error; | |
1da177e4 LT |
969 | } |
970 | ||
971 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
972 | u64 dma_get_required_mask(struct device *dev) | |
973 | { | |
974 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
975 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
976 | u64 mask; | |
977 | ||
978 | if (!high_totalram) { | |
979 | /* convert to mask just covering totalram */ | |
980 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
981 | low_totalram += low_totalram - 1; | |
982 | mask = low_totalram; | |
983 | } else { | |
984 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
985 | high_totalram += high_totalram - 1; | |
986 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
987 | } | |
e88a0c2c | 988 | return mask; |
1da177e4 LT |
989 | } |
990 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
991 | #endif | |
13977091 MD |
992 | |
993 | static __initdata LIST_HEAD(early_platform_driver_list); | |
994 | static __initdata LIST_HEAD(early_platform_device_list); | |
995 | ||
996 | /** | |
997 | * early_platform_driver_register | |
d86c1302 | 998 | * @epdrv: early_platform driver structure |
13977091 MD |
999 | * @buf: string passed from early_param() |
1000 | */ | |
1001 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
1002 | char *buf) | |
1003 | { | |
c60e0504 | 1004 | char *tmp; |
13977091 MD |
1005 | int n; |
1006 | ||
1007 | /* Simply add the driver to the end of the global list. | |
1008 | * Drivers will by default be put on the list in compiled-in order. | |
1009 | */ | |
1010 | if (!epdrv->list.next) { | |
1011 | INIT_LIST_HEAD(&epdrv->list); | |
1012 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
1013 | } | |
1014 | ||
1015 | /* If the user has specified device then make sure the driver | |
1016 | * gets prioritized. The driver of the last device specified on | |
1017 | * command line will be put first on the list. | |
1018 | */ | |
1019 | n = strlen(epdrv->pdrv->driver.name); | |
1020 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
1021 | list_move(&epdrv->list, &early_platform_driver_list); | |
1022 | ||
c60e0504 MD |
1023 | /* Allow passing parameters after device name */ |
1024 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 1025 | epdrv->requested_id = -1; |
c60e0504 MD |
1026 | else { |
1027 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
1028 | &tmp, 10); | |
1029 | ||
1030 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
1031 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
1032 | n = 0; | |
1033 | } else | |
1034 | n += strcspn(&buf[n + 1], ",") + 1; | |
1035 | } | |
1036 | ||
1037 | if (buf[n] == ',') | |
1038 | n++; | |
1039 | ||
1040 | if (epdrv->bufsize) { | |
1041 | memcpy(epdrv->buffer, &buf[n], | |
1042 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
1043 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
1044 | } | |
13977091 MD |
1045 | } |
1046 | ||
1047 | return 0; | |
1048 | } | |
1049 | ||
1050 | /** | |
1051 | * early_platform_add_devices - add a numbers of early platform devices | |
1052 | * @devs: array of early platform devices to add | |
1053 | * @num: number of early platform devices in array | |
1054 | */ | |
1055 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1056 | { | |
1057 | struct device *dev; | |
1058 | int i; | |
1059 | ||
1060 | /* simply add the devices to list */ | |
1061 | for (i = 0; i < num; i++) { | |
1062 | dev = &devs[i]->dev; | |
1063 | ||
1064 | if (!dev->devres_head.next) { | |
1065 | INIT_LIST_HEAD(&dev->devres_head); | |
1066 | list_add_tail(&dev->devres_head, | |
1067 | &early_platform_device_list); | |
1068 | } | |
1069 | } | |
1070 | } | |
1071 | ||
1072 | /** | |
1073 | * early_platform_driver_register_all | |
1074 | * @class_str: string to identify early platform driver class | |
1075 | */ | |
1076 | void __init early_platform_driver_register_all(char *class_str) | |
1077 | { | |
1078 | /* The "class_str" parameter may or may not be present on the kernel | |
1079 | * command line. If it is present then there may be more than one | |
1080 | * matching parameter. | |
1081 | * | |
1082 | * Since we register our early platform drivers using early_param() | |
1083 | * we need to make sure that they also get registered in the case | |
1084 | * when the parameter is missing from the kernel command line. | |
1085 | * | |
1086 | * We use parse_early_options() to make sure the early_param() gets | |
1087 | * called at least once. The early_param() may be called more than | |
1088 | * once since the name of the preferred device may be specified on | |
1089 | * the kernel command line. early_platform_driver_register() handles | |
1090 | * this case for us. | |
1091 | */ | |
1092 | parse_early_options(class_str); | |
1093 | } | |
1094 | ||
1095 | /** | |
1096 | * early_platform_match | |
d86c1302 | 1097 | * @epdrv: early platform driver structure |
13977091 MD |
1098 | * @id: id to match against |
1099 | */ | |
1100 | static __init struct platform_device * | |
1101 | early_platform_match(struct early_platform_driver *epdrv, int id) | |
1102 | { | |
1103 | struct platform_device *pd; | |
1104 | ||
1105 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1106 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1107 | if (pd->id == id) | |
1108 | return pd; | |
1109 | ||
1110 | return NULL; | |
1111 | } | |
1112 | ||
1113 | /** | |
1114 | * early_platform_left | |
d86c1302 | 1115 | * @epdrv: early platform driver structure |
13977091 MD |
1116 | * @id: return true if id or above exists |
1117 | */ | |
1118 | static __init int early_platform_left(struct early_platform_driver *epdrv, | |
1119 | int id) | |
1120 | { | |
1121 | struct platform_device *pd; | |
1122 | ||
1123 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1124 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1125 | if (pd->id >= id) | |
1126 | return 1; | |
1127 | ||
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | /** | |
1132 | * early_platform_driver_probe_id | |
1133 | * @class_str: string to identify early platform driver class | |
1134 | * @id: id to match against | |
1135 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1136 | */ | |
1137 | static int __init early_platform_driver_probe_id(char *class_str, | |
1138 | int id, | |
1139 | int nr_probe) | |
1140 | { | |
1141 | struct early_platform_driver *epdrv; | |
1142 | struct platform_device *match; | |
1143 | int match_id; | |
1144 | int n = 0; | |
1145 | int left = 0; | |
1146 | ||
1147 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1148 | /* only use drivers matching our class_str */ | |
1149 | if (strcmp(class_str, epdrv->class_str)) | |
1150 | continue; | |
1151 | ||
1152 | if (id == -2) { | |
1153 | match_id = epdrv->requested_id; | |
1154 | left = 1; | |
1155 | ||
1156 | } else { | |
1157 | match_id = id; | |
1158 | left += early_platform_left(epdrv, id); | |
1159 | ||
1160 | /* skip requested id */ | |
1161 | switch (epdrv->requested_id) { | |
1162 | case EARLY_PLATFORM_ID_ERROR: | |
1163 | case EARLY_PLATFORM_ID_UNSET: | |
1164 | break; | |
1165 | default: | |
1166 | if (epdrv->requested_id == id) | |
1167 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1168 | } | |
1169 | } | |
1170 | ||
1171 | switch (match_id) { | |
1172 | case EARLY_PLATFORM_ID_ERROR: | |
1173 | pr_warning("%s: unable to parse %s parameter\n", | |
1174 | class_str, epdrv->pdrv->driver.name); | |
1175 | /* fall-through */ | |
1176 | case EARLY_PLATFORM_ID_UNSET: | |
1177 | match = NULL; | |
1178 | break; | |
1179 | default: | |
1180 | match = early_platform_match(epdrv, match_id); | |
1181 | } | |
1182 | ||
1183 | if (match) { | |
1184 | if (epdrv->pdrv->probe(match)) | |
1185 | pr_warning("%s: unable to probe %s early.\n", | |
1186 | class_str, match->name); | |
1187 | else | |
1188 | n++; | |
1189 | } | |
1190 | ||
1191 | if (n >= nr_probe) | |
1192 | break; | |
1193 | } | |
1194 | ||
1195 | if (left) | |
1196 | return n; | |
1197 | else | |
1198 | return -ENODEV; | |
1199 | } | |
1200 | ||
1201 | /** | |
1202 | * early_platform_driver_probe | |
1203 | * @class_str: string to identify early platform driver class | |
1204 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1205 | * @user_only: only probe user specified early platform devices | |
1206 | */ | |
1207 | int __init early_platform_driver_probe(char *class_str, | |
1208 | int nr_probe, | |
1209 | int user_only) | |
1210 | { | |
1211 | int k, n, i; | |
1212 | ||
1213 | n = 0; | |
1214 | for (i = -2; n < nr_probe; i++) { | |
1215 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1216 | ||
1217 | if (k < 0) | |
1218 | break; | |
1219 | ||
1220 | n += k; | |
1221 | ||
1222 | if (user_only) | |
1223 | break; | |
1224 | } | |
1225 | ||
1226 | return n; | |
1227 | } | |
1228 | ||
1229 | /** | |
1230 | * early_platform_cleanup - clean up early platform code | |
1231 | */ | |
1232 | void __init early_platform_cleanup(void) | |
1233 | { | |
1234 | struct platform_device *pd, *pd2; | |
1235 | ||
1236 | /* clean up the devres list used to chain devices */ | |
1237 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1238 | dev.devres_head) { | |
1239 | list_del(&pd->dev.devres_head); | |
1240 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1241 | } | |
1242 | } | |
1243 |