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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * platform.c - platform 'pseudo' bus for legacy devices | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * Please see Documentation/driver-model/platform.txt for more | |
10 | * information. | |
11 | */ | |
12 | ||
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 LT |
26 | struct device platform_bus = { |
27 | .bus_id = "platform", | |
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 GKH |
71 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
72 | unsigned int type, char *name) | |
1da177e4 LT |
73 | { |
74 | int i; | |
75 | ||
76 | for (i = 0; i < dev->num_resources; i++) { | |
77 | struct resource *r = &dev->resource[i]; | |
78 | ||
c9f66169 MD |
79 | if (type == resource_type(r) && !strcmp(r->name, name)) |
80 | return r; | |
1da177e4 LT |
81 | } |
82 | return NULL; | |
83 | } | |
a96b2042 | 84 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
85 | |
86 | /** | |
4a3ad20c GKH |
87 | * platform_get_irq - get an IRQ for a device |
88 | * @dev: platform device | |
89 | * @name: IRQ name | |
1da177e4 LT |
90 | */ |
91 | int platform_get_irq_byname(struct platform_device *dev, char *name) | |
92 | { | |
4a3ad20c GKH |
93 | struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, |
94 | name); | |
1da177e4 | 95 | |
305b3228 | 96 | return r ? r->start : -ENXIO; |
1da177e4 | 97 | } |
a96b2042 | 98 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
99 | |
100 | /** | |
4a3ad20c GKH |
101 | * platform_add_devices - add a numbers of platform devices |
102 | * @devs: array of platform devices to add | |
103 | * @num: number of platform devices in array | |
1da177e4 LT |
104 | */ |
105 | int platform_add_devices(struct platform_device **devs, int num) | |
106 | { | |
107 | int i, ret = 0; | |
108 | ||
109 | for (i = 0; i < num; i++) { | |
110 | ret = platform_device_register(devs[i]); | |
111 | if (ret) { | |
112 | while (--i >= 0) | |
113 | platform_device_unregister(devs[i]); | |
114 | break; | |
115 | } | |
116 | } | |
117 | ||
118 | return ret; | |
119 | } | |
a96b2042 | 120 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 121 | |
37c12e74 RK |
122 | struct platform_object { |
123 | struct platform_device pdev; | |
124 | char name[1]; | |
125 | }; | |
126 | ||
1da177e4 | 127 | /** |
4a3ad20c GKH |
128 | * platform_device_put |
129 | * @pdev: platform device to free | |
37c12e74 | 130 | * |
4a3ad20c GKH |
131 | * Free all memory associated with a platform device. This function must |
132 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
133 | */ |
134 | void platform_device_put(struct platform_device *pdev) | |
135 | { | |
136 | if (pdev) | |
137 | put_device(&pdev->dev); | |
138 | } | |
139 | EXPORT_SYMBOL_GPL(platform_device_put); | |
140 | ||
141 | static void platform_device_release(struct device *dev) | |
142 | { | |
4a3ad20c GKH |
143 | struct platform_object *pa = container_of(dev, struct platform_object, |
144 | pdev.dev); | |
37c12e74 RK |
145 | |
146 | kfree(pa->pdev.dev.platform_data); | |
147 | kfree(pa->pdev.resource); | |
148 | kfree(pa); | |
149 | } | |
150 | ||
151 | /** | |
4a3ad20c GKH |
152 | * platform_device_alloc |
153 | * @name: base name of the device we're adding | |
154 | * @id: instance id | |
37c12e74 | 155 | * |
4a3ad20c GKH |
156 | * Create a platform device object which can have other objects attached |
157 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 158 | */ |
1359555e | 159 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
160 | { |
161 | struct platform_object *pa; | |
162 | ||
163 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); | |
164 | if (pa) { | |
165 | strcpy(pa->name, name); | |
166 | pa->pdev.name = pa->name; | |
167 | pa->pdev.id = id; | |
168 | device_initialize(&pa->pdev.dev); | |
169 | pa->pdev.dev.release = platform_device_release; | |
170 | } | |
171 | ||
93ce3061 | 172 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
173 | } |
174 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
175 | ||
176 | /** | |
4a3ad20c GKH |
177 | * platform_device_add_resources |
178 | * @pdev: platform device allocated by platform_device_alloc to add resources to | |
179 | * @res: set of resources that needs to be allocated for the device | |
180 | * @num: number of resources | |
37c12e74 | 181 | * |
4a3ad20c GKH |
182 | * Add a copy of the resources to the platform device. The memory |
183 | * associated with the resources will be freed when the platform device is | |
184 | * released. | |
37c12e74 | 185 | */ |
4a3ad20c GKH |
186 | int platform_device_add_resources(struct platform_device *pdev, |
187 | struct resource *res, unsigned int num) | |
37c12e74 RK |
188 | { |
189 | struct resource *r; | |
190 | ||
191 | r = kmalloc(sizeof(struct resource) * num, GFP_KERNEL); | |
192 | if (r) { | |
193 | memcpy(r, res, sizeof(struct resource) * num); | |
194 | pdev->resource = r; | |
195 | pdev->num_resources = num; | |
196 | } | |
197 | return r ? 0 : -ENOMEM; | |
198 | } | |
199 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
200 | ||
201 | /** | |
4a3ad20c GKH |
202 | * platform_device_add_data |
203 | * @pdev: platform device allocated by platform_device_alloc to add resources to | |
204 | * @data: platform specific data for this platform device | |
205 | * @size: size of platform specific data | |
37c12e74 | 206 | * |
4a3ad20c GKH |
207 | * Add a copy of platform specific data to the platform device's |
208 | * platform_data pointer. The memory associated with the platform data | |
209 | * will be freed when the platform device is released. | |
37c12e74 | 210 | */ |
4a3ad20c GKH |
211 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
212 | size_t size) | |
37c12e74 RK |
213 | { |
214 | void *d; | |
215 | ||
216 | d = kmalloc(size, GFP_KERNEL); | |
217 | if (d) { | |
218 | memcpy(d, data, size); | |
219 | pdev->dev.platform_data = d; | |
220 | } | |
221 | return d ? 0 : -ENOMEM; | |
222 | } | |
223 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
224 | ||
225 | /** | |
4a3ad20c GKH |
226 | * platform_device_add - add a platform device to device hierarchy |
227 | * @pdev: platform device we're adding | |
1da177e4 | 228 | * |
4a3ad20c GKH |
229 | * This is part 2 of platform_device_register(), though may be called |
230 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 231 | */ |
37c12e74 | 232 | int platform_device_add(struct platform_device *pdev) |
1da177e4 LT |
233 | { |
234 | int i, ret = 0; | |
235 | ||
236 | if (!pdev) | |
237 | return -EINVAL; | |
238 | ||
239 | if (!pdev->dev.parent) | |
240 | pdev->dev.parent = &platform_bus; | |
241 | ||
242 | pdev->dev.bus = &platform_bus_type; | |
243 | ||
244 | if (pdev->id != -1) | |
1359555e JD |
245 | snprintf(pdev->dev.bus_id, BUS_ID_SIZE, "%s.%d", pdev->name, |
246 | pdev->id); | |
1da177e4 LT |
247 | else |
248 | strlcpy(pdev->dev.bus_id, pdev->name, BUS_ID_SIZE); | |
249 | ||
250 | for (i = 0; i < pdev->num_resources; i++) { | |
251 | struct resource *p, *r = &pdev->resource[i]; | |
252 | ||
253 | if (r->name == NULL) | |
254 | r->name = pdev->dev.bus_id; | |
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", | |
267 | pdev->dev.bus_id, i); | |
268 | ret = -EBUSY; | |
269 | goto failed; | |
270 | } | |
271 | } | |
272 | ||
273 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
274 | pdev->dev.bus_id, pdev->dev.parent->bus_id); | |
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 | ||
473 | static int platform_drv_suspend(struct device *_dev, pm_message_t state) | |
474 | { | |
475 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
476 | struct platform_device *dev = to_platform_device(_dev); | |
477 | ||
478 | return drv->suspend(dev, state); | |
479 | } | |
480 | ||
481 | static int platform_drv_resume(struct device *_dev) | |
482 | { | |
483 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
484 | struct platform_device *dev = to_platform_device(_dev); | |
485 | ||
486 | return drv->resume(dev); | |
487 | } | |
488 | ||
489 | /** | |
4a3ad20c GKH |
490 | * platform_driver_register |
491 | * @drv: platform driver structure | |
00d3dcdd RK |
492 | */ |
493 | int platform_driver_register(struct platform_driver *drv) | |
494 | { | |
495 | drv->driver.bus = &platform_bus_type; | |
496 | if (drv->probe) | |
497 | drv->driver.probe = platform_drv_probe; | |
498 | if (drv->remove) | |
499 | drv->driver.remove = platform_drv_remove; | |
500 | if (drv->shutdown) | |
501 | drv->driver.shutdown = platform_drv_shutdown; | |
502 | if (drv->suspend) | |
503 | drv->driver.suspend = platform_drv_suspend; | |
504 | if (drv->resume) | |
505 | drv->driver.resume = platform_drv_resume; | |
25e18499 RW |
506 | if (drv->pm) |
507 | drv->driver.pm = &drv->pm->base; | |
00d3dcdd RK |
508 | return driver_register(&drv->driver); |
509 | } | |
510 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
511 | ||
512 | /** | |
4a3ad20c GKH |
513 | * platform_driver_unregister |
514 | * @drv: platform driver structure | |
00d3dcdd RK |
515 | */ |
516 | void platform_driver_unregister(struct platform_driver *drv) | |
517 | { | |
518 | driver_unregister(&drv->driver); | |
519 | } | |
520 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
521 | ||
c67334fb DB |
522 | /** |
523 | * platform_driver_probe - register driver for non-hotpluggable device | |
524 | * @drv: platform driver structure | |
525 | * @probe: the driver probe routine, probably from an __init section | |
526 | * | |
527 | * Use this instead of platform_driver_register() when you know the device | |
528 | * is not hotpluggable and has already been registered, and you want to | |
529 | * remove its run-once probe() infrastructure from memory after the driver | |
530 | * has bound to the device. | |
531 | * | |
532 | * One typical use for this would be with drivers for controllers integrated | |
533 | * into system-on-chip processors, where the controller devices have been | |
534 | * configured as part of board setup. | |
535 | * | |
536 | * Returns zero if the driver registered and bound to a device, else returns | |
537 | * a negative error code and with the driver not registered. | |
538 | */ | |
c63e0783 | 539 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
540 | int (*probe)(struct platform_device *)) |
541 | { | |
542 | int retval, code; | |
543 | ||
544 | /* temporary section violation during probe() */ | |
545 | drv->probe = probe; | |
546 | retval = code = platform_driver_register(drv); | |
547 | ||
548 | /* Fixup that section violation, being paranoid about code scanning | |
549 | * the list of drivers in order to probe new devices. Check to see | |
550 | * if the probe was successful, and make sure any forced probes of | |
551 | * new devices fail. | |
552 | */ | |
c6f7e72a | 553 | spin_lock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb | 554 | drv->probe = NULL; |
e5dd1278 | 555 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
556 | retval = -ENODEV; |
557 | drv->driver.probe = platform_drv_probe_fail; | |
c6f7e72a | 558 | spin_unlock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb DB |
559 | |
560 | if (code != retval) | |
561 | platform_driver_unregister(drv); | |
562 | return retval; | |
563 | } | |
564 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 565 | |
a0245f7a DB |
566 | /* modalias support enables more hands-off userspace setup: |
567 | * (a) environment variable lets new-style hotplug events work once system is | |
568 | * fully running: "modprobe $MODALIAS" | |
569 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
570 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
571 | */ | |
4a3ad20c GKH |
572 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
573 | char *buf) | |
a0245f7a DB |
574 | { |
575 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 576 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
577 | |
578 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
579 | } | |
580 | ||
581 | static struct device_attribute platform_dev_attrs[] = { | |
582 | __ATTR_RO(modalias), | |
583 | __ATTR_NULL, | |
584 | }; | |
585 | ||
7eff2e7a | 586 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
587 | { |
588 | struct platform_device *pdev = to_platform_device(dev); | |
589 | ||
7eff2e7a | 590 | add_uevent_var(env, "MODALIAS=platform:%s", pdev->name); |
a0245f7a DB |
591 | return 0; |
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 | { |
4a3ad20c | 609 | struct platform_device *pdev; |
1da177e4 | 610 | |
4a3ad20c | 611 | pdev = container_of(dev, struct platform_device, dev); |
1da177e4 LT |
612 | return (strncmp(pdev->name, drv->name, BUS_ID_SIZE) == 0); |
613 | } | |
614 | ||
25e18499 RW |
615 | #ifdef CONFIG_PM_SLEEP |
616 | ||
617 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 LT |
618 | { |
619 | int ret = 0; | |
620 | ||
9480e307 | 621 | if (dev->driver && dev->driver->suspend) |
386415d8 DB |
622 | ret = dev->driver->suspend(dev, mesg); |
623 | ||
624 | return ret; | |
625 | } | |
626 | ||
25e18499 | 627 | static int platform_legacy_suspend_late(struct device *dev, pm_message_t mesg) |
386415d8 DB |
628 | { |
629 | struct platform_driver *drv = to_platform_driver(dev->driver); | |
4a3ad20c | 630 | struct platform_device *pdev; |
386415d8 DB |
631 | int ret = 0; |
632 | ||
4a3ad20c | 633 | pdev = container_of(dev, struct platform_device, dev); |
386415d8 DB |
634 | if (dev->driver && drv->suspend_late) |
635 | ret = drv->suspend_late(pdev, mesg); | |
636 | ||
637 | return ret; | |
638 | } | |
639 | ||
25e18499 | 640 | static int platform_legacy_resume_early(struct device *dev) |
386415d8 DB |
641 | { |
642 | struct platform_driver *drv = to_platform_driver(dev->driver); | |
4a3ad20c | 643 | struct platform_device *pdev; |
386415d8 DB |
644 | int ret = 0; |
645 | ||
4a3ad20c | 646 | pdev = container_of(dev, struct platform_device, dev); |
386415d8 DB |
647 | if (dev->driver && drv->resume_early) |
648 | ret = drv->resume_early(pdev); | |
9480e307 | 649 | |
1da177e4 LT |
650 | return ret; |
651 | } | |
652 | ||
25e18499 | 653 | static int platform_legacy_resume(struct device *dev) |
1da177e4 LT |
654 | { |
655 | int ret = 0; | |
656 | ||
9480e307 RK |
657 | if (dev->driver && dev->driver->resume) |
658 | ret = dev->driver->resume(dev); | |
659 | ||
1da177e4 LT |
660 | return ret; |
661 | } | |
662 | ||
25e18499 RW |
663 | static int platform_pm_prepare(struct device *dev) |
664 | { | |
665 | struct device_driver *drv = dev->driver; | |
666 | int ret = 0; | |
667 | ||
668 | if (drv && drv->pm && drv->pm->prepare) | |
669 | ret = drv->pm->prepare(dev); | |
670 | ||
671 | return ret; | |
672 | } | |
673 | ||
674 | static void platform_pm_complete(struct device *dev) | |
675 | { | |
676 | struct device_driver *drv = dev->driver; | |
677 | ||
678 | if (drv && drv->pm && drv->pm->complete) | |
679 | drv->pm->complete(dev); | |
680 | } | |
681 | ||
682 | #ifdef CONFIG_SUSPEND | |
683 | ||
684 | static int platform_pm_suspend(struct device *dev) | |
685 | { | |
686 | struct device_driver *drv = dev->driver; | |
687 | int ret = 0; | |
688 | ||
689 | if (drv && drv->pm) { | |
690 | if (drv->pm->suspend) | |
691 | ret = drv->pm->suspend(dev); | |
692 | } else { | |
693 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
694 | } | |
695 | ||
696 | return ret; | |
697 | } | |
698 | ||
699 | static int platform_pm_suspend_noirq(struct device *dev) | |
700 | { | |
701 | struct platform_driver *pdrv; | |
702 | int ret = 0; | |
703 | ||
704 | if (!dev->driver) | |
705 | return 0; | |
706 | ||
707 | pdrv = to_platform_driver(dev->driver); | |
708 | if (pdrv->pm) { | |
709 | if (pdrv->pm->suspend_noirq) | |
710 | ret = pdrv->pm->suspend_noirq(dev); | |
711 | } else { | |
712 | ret = platform_legacy_suspend_late(dev, PMSG_SUSPEND); | |
713 | } | |
714 | ||
715 | return ret; | |
716 | } | |
717 | ||
718 | static int platform_pm_resume(struct device *dev) | |
719 | { | |
720 | struct device_driver *drv = dev->driver; | |
721 | int ret = 0; | |
722 | ||
723 | if (drv && drv->pm) { | |
724 | if (drv->pm->resume) | |
725 | ret = drv->pm->resume(dev); | |
726 | } else { | |
727 | ret = platform_legacy_resume(dev); | |
728 | } | |
729 | ||
730 | return ret; | |
731 | } | |
732 | ||
733 | static int platform_pm_resume_noirq(struct device *dev) | |
734 | { | |
735 | struct platform_driver *pdrv; | |
736 | int ret = 0; | |
737 | ||
738 | if (!dev->driver) | |
739 | return 0; | |
740 | ||
741 | pdrv = to_platform_driver(dev->driver); | |
742 | if (pdrv->pm) { | |
743 | if (pdrv->pm->resume_noirq) | |
744 | ret = pdrv->pm->resume_noirq(dev); | |
745 | } else { | |
746 | ret = platform_legacy_resume_early(dev); | |
747 | } | |
748 | ||
749 | return ret; | |
750 | } | |
751 | ||
752 | #else /* !CONFIG_SUSPEND */ | |
753 | ||
754 | #define platform_pm_suspend NULL | |
755 | #define platform_pm_resume NULL | |
756 | #define platform_pm_suspend_noirq NULL | |
757 | #define platform_pm_resume_noirq NULL | |
758 | ||
759 | #endif /* !CONFIG_SUSPEND */ | |
760 | ||
761 | #ifdef CONFIG_HIBERNATION | |
762 | ||
763 | static int platform_pm_freeze(struct device *dev) | |
764 | { | |
765 | struct device_driver *drv = dev->driver; | |
766 | int ret = 0; | |
767 | ||
768 | if (!drv) | |
769 | return 0; | |
770 | ||
771 | if (drv->pm) { | |
772 | if (drv->pm->freeze) | |
773 | ret = drv->pm->freeze(dev); | |
774 | } else { | |
775 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
776 | } | |
777 | ||
778 | return ret; | |
779 | } | |
780 | ||
781 | static int platform_pm_freeze_noirq(struct device *dev) | |
782 | { | |
783 | struct platform_driver *pdrv; | |
784 | int ret = 0; | |
785 | ||
786 | if (!dev->driver) | |
787 | return 0; | |
788 | ||
789 | pdrv = to_platform_driver(dev->driver); | |
790 | if (pdrv->pm) { | |
791 | if (pdrv->pm->freeze_noirq) | |
792 | ret = pdrv->pm->freeze_noirq(dev); | |
793 | } else { | |
794 | ret = platform_legacy_suspend_late(dev, PMSG_FREEZE); | |
795 | } | |
796 | ||
797 | return ret; | |
798 | } | |
799 | ||
800 | static int platform_pm_thaw(struct device *dev) | |
801 | { | |
802 | struct device_driver *drv = dev->driver; | |
803 | int ret = 0; | |
804 | ||
805 | if (drv && drv->pm) { | |
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 | ||
815 | static int platform_pm_thaw_noirq(struct device *dev) | |
816 | { | |
817 | struct platform_driver *pdrv; | |
818 | int ret = 0; | |
819 | ||
820 | if (!dev->driver) | |
821 | return 0; | |
822 | ||
823 | pdrv = to_platform_driver(dev->driver); | |
824 | if (pdrv->pm) { | |
825 | if (pdrv->pm->thaw_noirq) | |
826 | ret = pdrv->pm->thaw_noirq(dev); | |
827 | } else { | |
828 | ret = platform_legacy_resume_early(dev); | |
829 | } | |
830 | ||
831 | return ret; | |
832 | } | |
833 | ||
834 | static int platform_pm_poweroff(struct device *dev) | |
835 | { | |
836 | struct device_driver *drv = dev->driver; | |
837 | int ret = 0; | |
838 | ||
839 | if (drv && drv->pm) { | |
840 | if (drv->pm->poweroff) | |
841 | ret = drv->pm->poweroff(dev); | |
842 | } else { | |
843 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
844 | } | |
845 | ||
846 | return ret; | |
847 | } | |
848 | ||
849 | static int platform_pm_poweroff_noirq(struct device *dev) | |
850 | { | |
851 | struct platform_driver *pdrv; | |
852 | int ret = 0; | |
853 | ||
854 | if (!dev->driver) | |
855 | return 0; | |
856 | ||
857 | pdrv = to_platform_driver(dev->driver); | |
858 | if (pdrv->pm) { | |
859 | if (pdrv->pm->poweroff_noirq) | |
860 | ret = pdrv->pm->poweroff_noirq(dev); | |
861 | } else { | |
862 | ret = platform_legacy_suspend_late(dev, PMSG_HIBERNATE); | |
863 | } | |
864 | ||
865 | return ret; | |
866 | } | |
867 | ||
868 | static int platform_pm_restore(struct device *dev) | |
869 | { | |
870 | struct device_driver *drv = dev->driver; | |
871 | int ret = 0; | |
872 | ||
873 | if (drv && drv->pm) { | |
874 | if (drv->pm->restore) | |
875 | ret = drv->pm->restore(dev); | |
876 | } else { | |
877 | ret = platform_legacy_resume(dev); | |
878 | } | |
879 | ||
880 | return ret; | |
881 | } | |
882 | ||
883 | static int platform_pm_restore_noirq(struct device *dev) | |
884 | { | |
885 | struct platform_driver *pdrv; | |
886 | int ret = 0; | |
887 | ||
888 | if (!dev->driver) | |
889 | return 0; | |
890 | ||
891 | pdrv = to_platform_driver(dev->driver); | |
892 | if (pdrv->pm) { | |
893 | if (pdrv->pm->restore_noirq) | |
894 | ret = pdrv->pm->restore_noirq(dev); | |
895 | } else { | |
896 | ret = platform_legacy_resume_early(dev); | |
897 | } | |
898 | ||
899 | return ret; | |
900 | } | |
901 | ||
902 | #else /* !CONFIG_HIBERNATION */ | |
903 | ||
904 | #define platform_pm_freeze NULL | |
905 | #define platform_pm_thaw NULL | |
906 | #define platform_pm_poweroff NULL | |
907 | #define platform_pm_restore NULL | |
908 | #define platform_pm_freeze_noirq NULL | |
909 | #define platform_pm_thaw_noirq NULL | |
910 | #define platform_pm_poweroff_noirq NULL | |
911 | #define platform_pm_restore_noirq NULL | |
912 | ||
913 | #endif /* !CONFIG_HIBERNATION */ | |
914 | ||
ec748fa9 | 915 | static struct pm_ext_ops platform_pm_ops = { |
25e18499 RW |
916 | .base = { |
917 | .prepare = platform_pm_prepare, | |
918 | .complete = platform_pm_complete, | |
919 | .suspend = platform_pm_suspend, | |
920 | .resume = platform_pm_resume, | |
921 | .freeze = platform_pm_freeze, | |
922 | .thaw = platform_pm_thaw, | |
923 | .poweroff = platform_pm_poweroff, | |
924 | .restore = platform_pm_restore, | |
925 | }, | |
926 | .suspend_noirq = platform_pm_suspend_noirq, | |
927 | .resume_noirq = platform_pm_resume_noirq, | |
928 | .freeze_noirq = platform_pm_freeze_noirq, | |
929 | .thaw_noirq = platform_pm_thaw_noirq, | |
930 | .poweroff_noirq = platform_pm_poweroff_noirq, | |
931 | .restore_noirq = platform_pm_restore_noirq, | |
932 | }; | |
933 | ||
934 | #define PLATFORM_PM_OPS_PTR &platform_pm_ops | |
935 | ||
936 | #else /* !CONFIG_PM_SLEEP */ | |
937 | ||
938 | #define PLATFORM_PM_OPS_PTR NULL | |
939 | ||
940 | #endif /* !CONFIG_PM_SLEEP */ | |
941 | ||
1da177e4 LT |
942 | struct bus_type platform_bus_type = { |
943 | .name = "platform", | |
a0245f7a | 944 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 945 | .match = platform_match, |
a0245f7a | 946 | .uevent = platform_uevent, |
25e18499 | 947 | .pm = PLATFORM_PM_OPS_PTR, |
1da177e4 | 948 | }; |
a96b2042 | 949 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
950 | |
951 | int __init platform_bus_init(void) | |
952 | { | |
fbfb1445 CH |
953 | int error; |
954 | ||
955 | error = device_register(&platform_bus); | |
956 | if (error) | |
957 | return error; | |
958 | error = bus_register(&platform_bus_type); | |
959 | if (error) | |
960 | device_unregister(&platform_bus); | |
961 | return error; | |
1da177e4 LT |
962 | } |
963 | ||
964 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
965 | u64 dma_get_required_mask(struct device *dev) | |
966 | { | |
967 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
968 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
969 | u64 mask; | |
970 | ||
971 | if (!high_totalram) { | |
972 | /* convert to mask just covering totalram */ | |
973 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
974 | low_totalram += low_totalram - 1; | |
975 | mask = low_totalram; | |
976 | } else { | |
977 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
978 | high_totalram += high_totalram - 1; | |
979 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
980 | } | |
e88a0c2c | 981 | return mask; |
1da177e4 LT |
982 | } |
983 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
984 | #endif |