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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 | ||
45 | if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM| | |
4a3ad20c | 46 | IORESOURCE_IRQ|IORESOURCE_DMA)) == type) |
1da177e4 LT |
47 | if (num-- == 0) |
48 | return r; | |
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 GKH |
73 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
74 | unsigned int type, char *name) | |
1da177e4 LT |
75 | { |
76 | int i; | |
77 | ||
78 | for (i = 0; i < dev->num_resources; i++) { | |
79 | struct resource *r = &dev->resource[i]; | |
80 | ||
81 | if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM| | |
82 | IORESOURCE_IRQ|IORESOURCE_DMA)) == type) | |
83 | if (!strcmp(r->name, name)) | |
84 | return r; | |
85 | } | |
86 | return NULL; | |
87 | } | |
a96b2042 | 88 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
89 | |
90 | /** | |
4a3ad20c GKH |
91 | * platform_get_irq - get an IRQ for a device |
92 | * @dev: platform device | |
93 | * @name: IRQ name | |
1da177e4 LT |
94 | */ |
95 | int platform_get_irq_byname(struct platform_device *dev, char *name) | |
96 | { | |
4a3ad20c GKH |
97 | struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, |
98 | name); | |
1da177e4 | 99 | |
305b3228 | 100 | return r ? r->start : -ENXIO; |
1da177e4 | 101 | } |
a96b2042 | 102 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
103 | |
104 | /** | |
4a3ad20c GKH |
105 | * platform_add_devices - add a numbers of platform devices |
106 | * @devs: array of platform devices to add | |
107 | * @num: number of platform devices in array | |
1da177e4 LT |
108 | */ |
109 | int platform_add_devices(struct platform_device **devs, int num) | |
110 | { | |
111 | int i, ret = 0; | |
112 | ||
113 | for (i = 0; i < num; i++) { | |
114 | ret = platform_device_register(devs[i]); | |
115 | if (ret) { | |
116 | while (--i >= 0) | |
117 | platform_device_unregister(devs[i]); | |
118 | break; | |
119 | } | |
120 | } | |
121 | ||
122 | return ret; | |
123 | } | |
a96b2042 | 124 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 125 | |
37c12e74 RK |
126 | struct platform_object { |
127 | struct platform_device pdev; | |
128 | char name[1]; | |
129 | }; | |
130 | ||
1da177e4 | 131 | /** |
4a3ad20c GKH |
132 | * platform_device_put |
133 | * @pdev: platform device to free | |
37c12e74 | 134 | * |
4a3ad20c GKH |
135 | * Free all memory associated with a platform device. This function must |
136 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
137 | */ |
138 | void platform_device_put(struct platform_device *pdev) | |
139 | { | |
140 | if (pdev) | |
141 | put_device(&pdev->dev); | |
142 | } | |
143 | EXPORT_SYMBOL_GPL(platform_device_put); | |
144 | ||
145 | static void platform_device_release(struct device *dev) | |
146 | { | |
4a3ad20c GKH |
147 | struct platform_object *pa = container_of(dev, struct platform_object, |
148 | pdev.dev); | |
37c12e74 RK |
149 | |
150 | kfree(pa->pdev.dev.platform_data); | |
151 | kfree(pa->pdev.resource); | |
152 | kfree(pa); | |
153 | } | |
154 | ||
155 | /** | |
4a3ad20c GKH |
156 | * platform_device_alloc |
157 | * @name: base name of the device we're adding | |
158 | * @id: instance id | |
37c12e74 | 159 | * |
4a3ad20c GKH |
160 | * Create a platform device object which can have other objects attached |
161 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 162 | */ |
1359555e | 163 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
164 | { |
165 | struct platform_object *pa; | |
166 | ||
167 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); | |
168 | if (pa) { | |
169 | strcpy(pa->name, name); | |
170 | pa->pdev.name = pa->name; | |
171 | pa->pdev.id = id; | |
172 | device_initialize(&pa->pdev.dev); | |
173 | pa->pdev.dev.release = platform_device_release; | |
174 | } | |
175 | ||
93ce3061 | 176 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
177 | } |
178 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
179 | ||
180 | /** | |
4a3ad20c GKH |
181 | * platform_device_add_resources |
182 | * @pdev: platform device allocated by platform_device_alloc to add resources to | |
183 | * @res: set of resources that needs to be allocated for the device | |
184 | * @num: number of resources | |
37c12e74 | 185 | * |
4a3ad20c GKH |
186 | * Add a copy of the resources to the platform device. The memory |
187 | * associated with the resources will be freed when the platform device is | |
188 | * released. | |
37c12e74 | 189 | */ |
4a3ad20c GKH |
190 | int platform_device_add_resources(struct platform_device *pdev, |
191 | struct resource *res, unsigned int num) | |
37c12e74 RK |
192 | { |
193 | struct resource *r; | |
194 | ||
195 | r = kmalloc(sizeof(struct resource) * num, GFP_KERNEL); | |
196 | if (r) { | |
197 | memcpy(r, res, sizeof(struct resource) * num); | |
198 | pdev->resource = r; | |
199 | pdev->num_resources = num; | |
200 | } | |
201 | return r ? 0 : -ENOMEM; | |
202 | } | |
203 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
204 | ||
205 | /** | |
4a3ad20c GKH |
206 | * platform_device_add_data |
207 | * @pdev: platform device allocated by platform_device_alloc to add resources to | |
208 | * @data: platform specific data for this platform device | |
209 | * @size: size of platform specific data | |
37c12e74 | 210 | * |
4a3ad20c GKH |
211 | * Add a copy of platform specific data to the platform device's |
212 | * platform_data pointer. The memory associated with the platform data | |
213 | * will be freed when the platform device is released. | |
37c12e74 | 214 | */ |
4a3ad20c GKH |
215 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
216 | size_t size) | |
37c12e74 RK |
217 | { |
218 | void *d; | |
219 | ||
220 | d = kmalloc(size, GFP_KERNEL); | |
221 | if (d) { | |
222 | memcpy(d, data, size); | |
223 | pdev->dev.platform_data = d; | |
224 | } | |
225 | return d ? 0 : -ENOMEM; | |
226 | } | |
227 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
228 | ||
229 | /** | |
4a3ad20c GKH |
230 | * platform_device_add - add a platform device to device hierarchy |
231 | * @pdev: platform device we're adding | |
1da177e4 | 232 | * |
4a3ad20c GKH |
233 | * This is part 2 of platform_device_register(), though may be called |
234 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 235 | */ |
37c12e74 | 236 | int platform_device_add(struct platform_device *pdev) |
1da177e4 LT |
237 | { |
238 | int i, ret = 0; | |
239 | ||
240 | if (!pdev) | |
241 | return -EINVAL; | |
242 | ||
243 | if (!pdev->dev.parent) | |
244 | pdev->dev.parent = &platform_bus; | |
245 | ||
246 | pdev->dev.bus = &platform_bus_type; | |
247 | ||
248 | if (pdev->id != -1) | |
1359555e JD |
249 | snprintf(pdev->dev.bus_id, BUS_ID_SIZE, "%s.%d", pdev->name, |
250 | pdev->id); | |
1da177e4 LT |
251 | else |
252 | strlcpy(pdev->dev.bus_id, pdev->name, BUS_ID_SIZE); | |
253 | ||
254 | for (i = 0; i < pdev->num_resources; i++) { | |
255 | struct resource *p, *r = &pdev->resource[i]; | |
256 | ||
257 | if (r->name == NULL) | |
258 | r->name = pdev->dev.bus_id; | |
259 | ||
260 | p = r->parent; | |
261 | if (!p) { | |
262 | if (r->flags & IORESOURCE_MEM) | |
263 | p = &iomem_resource; | |
264 | else if (r->flags & IORESOURCE_IO) | |
265 | p = &ioport_resource; | |
266 | } | |
267 | ||
d960bb4d | 268 | if (p && insert_resource(p, r)) { |
1da177e4 LT |
269 | printk(KERN_ERR |
270 | "%s: failed to claim resource %d\n", | |
271 | pdev->dev.bus_id, i); | |
272 | ret = -EBUSY; | |
273 | goto failed; | |
274 | } | |
275 | } | |
276 | ||
277 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
278 | pdev->dev.bus_id, pdev->dev.parent->bus_id); | |
279 | ||
e3915532 | 280 | ret = device_add(&pdev->dev); |
1da177e4 LT |
281 | if (ret == 0) |
282 | return ret; | |
283 | ||
284 | failed: | |
285 | while (--i >= 0) | |
286 | if (pdev->resource[i].flags & (IORESOURCE_MEM|IORESOURCE_IO)) | |
287 | release_resource(&pdev->resource[i]); | |
288 | return ret; | |
289 | } | |
37c12e74 RK |
290 | EXPORT_SYMBOL_GPL(platform_device_add); |
291 | ||
292 | /** | |
4a3ad20c GKH |
293 | * platform_device_del - remove a platform-level device |
294 | * @pdev: platform device we're removing | |
1da177e4 | 295 | * |
4a3ad20c GKH |
296 | * Note that this function will also release all memory- and port-based |
297 | * resources owned by the device (@dev->resource). This function must | |
298 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 299 | */ |
93ce3061 | 300 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
301 | { |
302 | int i; | |
303 | ||
304 | if (pdev) { | |
dc4c15d4 JD |
305 | device_del(&pdev->dev); |
306 | ||
1da177e4 LT |
307 | for (i = 0; i < pdev->num_resources; i++) { |
308 | struct resource *r = &pdev->resource[i]; | |
309 | if (r->flags & (IORESOURCE_MEM|IORESOURCE_IO)) | |
310 | release_resource(r); | |
311 | } | |
1da177e4 LT |
312 | } |
313 | } | |
93ce3061 DT |
314 | EXPORT_SYMBOL_GPL(platform_device_del); |
315 | ||
316 | /** | |
4a3ad20c GKH |
317 | * platform_device_register - add a platform-level device |
318 | * @pdev: platform device we're adding | |
93ce3061 | 319 | */ |
4a3ad20c | 320 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
321 | { |
322 | device_initialize(&pdev->dev); | |
323 | return platform_device_add(pdev); | |
324 | } | |
a96b2042 | 325 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
326 | |
327 | /** | |
4a3ad20c GKH |
328 | * platform_device_unregister - unregister a platform-level device |
329 | * @pdev: platform device we're unregistering | |
93ce3061 | 330 | * |
4a3ad20c GKH |
331 | * Unregistration is done in 2 steps. First we release all resources |
332 | * and remove it from the subsystem, then we drop reference count by | |
333 | * calling platform_device_put(). | |
93ce3061 | 334 | */ |
4a3ad20c | 335 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
336 | { |
337 | platform_device_del(pdev); | |
338 | platform_device_put(pdev); | |
339 | } | |
a96b2042 | 340 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 341 | |
1da177e4 | 342 | /** |
4a3ad20c GKH |
343 | * platform_device_register_simple |
344 | * @name: base name of the device we're adding | |
345 | * @id: instance id | |
346 | * @res: set of resources that needs to be allocated for the device | |
347 | * @num: number of resources | |
1da177e4 | 348 | * |
4a3ad20c GKH |
349 | * This function creates a simple platform device that requires minimal |
350 | * resource and memory management. Canned release function freeing memory | |
351 | * allocated for the device allows drivers using such devices to be | |
352 | * unloaded without waiting for the last reference to the device to be | |
353 | * dropped. | |
49a4ec18 | 354 | * |
4a3ad20c GKH |
355 | * This interface is primarily intended for use with legacy drivers which |
356 | * probe hardware directly. Because such drivers create sysfs device nodes | |
357 | * themselves, rather than letting system infrastructure handle such device | |
358 | * enumeration tasks, they don't fully conform to the Linux driver model. | |
359 | * In particular, when such drivers are built as modules, they can't be | |
360 | * "hotplugged". | |
1da177e4 | 361 | */ |
4a3ad20c GKH |
362 | struct platform_device *platform_device_register_simple(const char *name, |
363 | int id, | |
364 | struct resource *res, | |
365 | unsigned int num) | |
1da177e4 | 366 | { |
37c12e74 | 367 | struct platform_device *pdev; |
1da177e4 LT |
368 | int retval; |
369 | ||
37c12e74 RK |
370 | pdev = platform_device_alloc(name, id); |
371 | if (!pdev) { | |
1da177e4 LT |
372 | retval = -ENOMEM; |
373 | goto error; | |
374 | } | |
375 | ||
1da177e4 | 376 | if (num) { |
37c12e74 RK |
377 | retval = platform_device_add_resources(pdev, res, num); |
378 | if (retval) | |
379 | goto error; | |
1da177e4 LT |
380 | } |
381 | ||
37c12e74 | 382 | retval = platform_device_add(pdev); |
1da177e4 LT |
383 | if (retval) |
384 | goto error; | |
385 | ||
37c12e74 | 386 | return pdev; |
1da177e4 LT |
387 | |
388 | error: | |
37c12e74 | 389 | platform_device_put(pdev); |
1da177e4 LT |
390 | return ERR_PTR(retval); |
391 | } | |
a96b2042 | 392 | EXPORT_SYMBOL_GPL(platform_device_register_simple); |
1da177e4 | 393 | |
00d3dcdd RK |
394 | static int platform_drv_probe(struct device *_dev) |
395 | { | |
396 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
397 | struct platform_device *dev = to_platform_device(_dev); | |
398 | ||
399 | return drv->probe(dev); | |
400 | } | |
401 | ||
c67334fb DB |
402 | static int platform_drv_probe_fail(struct device *_dev) |
403 | { | |
404 | return -ENXIO; | |
405 | } | |
406 | ||
00d3dcdd RK |
407 | static int platform_drv_remove(struct device *_dev) |
408 | { | |
409 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
410 | struct platform_device *dev = to_platform_device(_dev); | |
411 | ||
412 | return drv->remove(dev); | |
413 | } | |
414 | ||
415 | static void platform_drv_shutdown(struct device *_dev) | |
416 | { | |
417 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
418 | struct platform_device *dev = to_platform_device(_dev); | |
419 | ||
420 | drv->shutdown(dev); | |
421 | } | |
422 | ||
423 | static int platform_drv_suspend(struct device *_dev, pm_message_t state) | |
424 | { | |
425 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
426 | struct platform_device *dev = to_platform_device(_dev); | |
427 | ||
428 | return drv->suspend(dev, state); | |
429 | } | |
430 | ||
431 | static int platform_drv_resume(struct device *_dev) | |
432 | { | |
433 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
434 | struct platform_device *dev = to_platform_device(_dev); | |
435 | ||
436 | return drv->resume(dev); | |
437 | } | |
438 | ||
439 | /** | |
4a3ad20c GKH |
440 | * platform_driver_register |
441 | * @drv: platform driver structure | |
00d3dcdd RK |
442 | */ |
443 | int platform_driver_register(struct platform_driver *drv) | |
444 | { | |
445 | drv->driver.bus = &platform_bus_type; | |
446 | if (drv->probe) | |
447 | drv->driver.probe = platform_drv_probe; | |
448 | if (drv->remove) | |
449 | drv->driver.remove = platform_drv_remove; | |
450 | if (drv->shutdown) | |
451 | drv->driver.shutdown = platform_drv_shutdown; | |
452 | if (drv->suspend) | |
453 | drv->driver.suspend = platform_drv_suspend; | |
454 | if (drv->resume) | |
455 | drv->driver.resume = platform_drv_resume; | |
25e18499 RW |
456 | if (drv->pm) |
457 | drv->driver.pm = &drv->pm->base; | |
00d3dcdd RK |
458 | return driver_register(&drv->driver); |
459 | } | |
460 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
461 | ||
462 | /** | |
4a3ad20c GKH |
463 | * platform_driver_unregister |
464 | * @drv: platform driver structure | |
00d3dcdd RK |
465 | */ |
466 | void platform_driver_unregister(struct platform_driver *drv) | |
467 | { | |
468 | driver_unregister(&drv->driver); | |
469 | } | |
470 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
471 | ||
c67334fb DB |
472 | /** |
473 | * platform_driver_probe - register driver for non-hotpluggable device | |
474 | * @drv: platform driver structure | |
475 | * @probe: the driver probe routine, probably from an __init section | |
476 | * | |
477 | * Use this instead of platform_driver_register() when you know the device | |
478 | * is not hotpluggable and has already been registered, and you want to | |
479 | * remove its run-once probe() infrastructure from memory after the driver | |
480 | * has bound to the device. | |
481 | * | |
482 | * One typical use for this would be with drivers for controllers integrated | |
483 | * into system-on-chip processors, where the controller devices have been | |
484 | * configured as part of board setup. | |
485 | * | |
486 | * Returns zero if the driver registered and bound to a device, else returns | |
487 | * a negative error code and with the driver not registered. | |
488 | */ | |
c63e0783 | 489 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
490 | int (*probe)(struct platform_device *)) |
491 | { | |
492 | int retval, code; | |
493 | ||
494 | /* temporary section violation during probe() */ | |
495 | drv->probe = probe; | |
496 | retval = code = platform_driver_register(drv); | |
497 | ||
498 | /* Fixup that section violation, being paranoid about code scanning | |
499 | * the list of drivers in order to probe new devices. Check to see | |
500 | * if the probe was successful, and make sure any forced probes of | |
501 | * new devices fail. | |
502 | */ | |
c6f7e72a | 503 | spin_lock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb | 504 | drv->probe = NULL; |
e5dd1278 | 505 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
506 | retval = -ENODEV; |
507 | drv->driver.probe = platform_drv_probe_fail; | |
c6f7e72a | 508 | spin_unlock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb DB |
509 | |
510 | if (code != retval) | |
511 | platform_driver_unregister(drv); | |
512 | return retval; | |
513 | } | |
514 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 515 | |
a0245f7a DB |
516 | /* modalias support enables more hands-off userspace setup: |
517 | * (a) environment variable lets new-style hotplug events work once system is | |
518 | * fully running: "modprobe $MODALIAS" | |
519 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
520 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
521 | */ | |
4a3ad20c GKH |
522 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
523 | char *buf) | |
a0245f7a DB |
524 | { |
525 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 526 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
527 | |
528 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
529 | } | |
530 | ||
531 | static struct device_attribute platform_dev_attrs[] = { | |
532 | __ATTR_RO(modalias), | |
533 | __ATTR_NULL, | |
534 | }; | |
535 | ||
7eff2e7a | 536 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
537 | { |
538 | struct platform_device *pdev = to_platform_device(dev); | |
539 | ||
7eff2e7a | 540 | add_uevent_var(env, "MODALIAS=platform:%s", pdev->name); |
a0245f7a DB |
541 | return 0; |
542 | } | |
543 | ||
1da177e4 | 544 | /** |
4a3ad20c GKH |
545 | * platform_match - bind platform device to platform driver. |
546 | * @dev: device. | |
547 | * @drv: driver. | |
1da177e4 | 548 | * |
4a3ad20c GKH |
549 | * Platform device IDs are assumed to be encoded like this: |
550 | * "<name><instance>", where <name> is a short description of the type of | |
551 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
552 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
553 | * "<name>". So, extract the <name> from the platform_device structure, | |
554 | * and compare it against the name of the driver. Return whether they match | |
555 | * or not. | |
1da177e4 | 556 | */ |
4a3ad20c | 557 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 558 | { |
4a3ad20c | 559 | struct platform_device *pdev; |
1da177e4 | 560 | |
4a3ad20c | 561 | pdev = container_of(dev, struct platform_device, dev); |
1da177e4 LT |
562 | return (strncmp(pdev->name, drv->name, BUS_ID_SIZE) == 0); |
563 | } | |
564 | ||
25e18499 RW |
565 | #ifdef CONFIG_PM_SLEEP |
566 | ||
567 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 LT |
568 | { |
569 | int ret = 0; | |
570 | ||
9480e307 | 571 | if (dev->driver && dev->driver->suspend) |
386415d8 DB |
572 | ret = dev->driver->suspend(dev, mesg); |
573 | ||
574 | return ret; | |
575 | } | |
576 | ||
25e18499 | 577 | static int platform_legacy_suspend_late(struct device *dev, pm_message_t mesg) |
386415d8 DB |
578 | { |
579 | struct platform_driver *drv = to_platform_driver(dev->driver); | |
4a3ad20c | 580 | struct platform_device *pdev; |
386415d8 DB |
581 | int ret = 0; |
582 | ||
4a3ad20c | 583 | pdev = container_of(dev, struct platform_device, dev); |
386415d8 DB |
584 | if (dev->driver && drv->suspend_late) |
585 | ret = drv->suspend_late(pdev, mesg); | |
586 | ||
587 | return ret; | |
588 | } | |
589 | ||
25e18499 | 590 | static int platform_legacy_resume_early(struct device *dev) |
386415d8 DB |
591 | { |
592 | struct platform_driver *drv = to_platform_driver(dev->driver); | |
4a3ad20c | 593 | struct platform_device *pdev; |
386415d8 DB |
594 | int ret = 0; |
595 | ||
4a3ad20c | 596 | pdev = container_of(dev, struct platform_device, dev); |
386415d8 DB |
597 | if (dev->driver && drv->resume_early) |
598 | ret = drv->resume_early(pdev); | |
9480e307 | 599 | |
1da177e4 LT |
600 | return ret; |
601 | } | |
602 | ||
25e18499 | 603 | static int platform_legacy_resume(struct device *dev) |
1da177e4 LT |
604 | { |
605 | int ret = 0; | |
606 | ||
9480e307 RK |
607 | if (dev->driver && dev->driver->resume) |
608 | ret = dev->driver->resume(dev); | |
609 | ||
1da177e4 LT |
610 | return ret; |
611 | } | |
612 | ||
25e18499 RW |
613 | static int platform_pm_prepare(struct device *dev) |
614 | { | |
615 | struct device_driver *drv = dev->driver; | |
616 | int ret = 0; | |
617 | ||
618 | if (drv && drv->pm && drv->pm->prepare) | |
619 | ret = drv->pm->prepare(dev); | |
620 | ||
621 | return ret; | |
622 | } | |
623 | ||
624 | static void platform_pm_complete(struct device *dev) | |
625 | { | |
626 | struct device_driver *drv = dev->driver; | |
627 | ||
628 | if (drv && drv->pm && drv->pm->complete) | |
629 | drv->pm->complete(dev); | |
630 | } | |
631 | ||
632 | #ifdef CONFIG_SUSPEND | |
633 | ||
634 | static int platform_pm_suspend(struct device *dev) | |
635 | { | |
636 | struct device_driver *drv = dev->driver; | |
637 | int ret = 0; | |
638 | ||
639 | if (drv && drv->pm) { | |
640 | if (drv->pm->suspend) | |
641 | ret = drv->pm->suspend(dev); | |
642 | } else { | |
643 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
644 | } | |
645 | ||
646 | return ret; | |
647 | } | |
648 | ||
649 | static int platform_pm_suspend_noirq(struct device *dev) | |
650 | { | |
651 | struct platform_driver *pdrv; | |
652 | int ret = 0; | |
653 | ||
654 | if (!dev->driver) | |
655 | return 0; | |
656 | ||
657 | pdrv = to_platform_driver(dev->driver); | |
658 | if (pdrv->pm) { | |
659 | if (pdrv->pm->suspend_noirq) | |
660 | ret = pdrv->pm->suspend_noirq(dev); | |
661 | } else { | |
662 | ret = platform_legacy_suspend_late(dev, PMSG_SUSPEND); | |
663 | } | |
664 | ||
665 | return ret; | |
666 | } | |
667 | ||
668 | static int platform_pm_resume(struct device *dev) | |
669 | { | |
670 | struct device_driver *drv = dev->driver; | |
671 | int ret = 0; | |
672 | ||
673 | if (drv && drv->pm) { | |
674 | if (drv->pm->resume) | |
675 | ret = drv->pm->resume(dev); | |
676 | } else { | |
677 | ret = platform_legacy_resume(dev); | |
678 | } | |
679 | ||
680 | return ret; | |
681 | } | |
682 | ||
683 | static int platform_pm_resume_noirq(struct device *dev) | |
684 | { | |
685 | struct platform_driver *pdrv; | |
686 | int ret = 0; | |
687 | ||
688 | if (!dev->driver) | |
689 | return 0; | |
690 | ||
691 | pdrv = to_platform_driver(dev->driver); | |
692 | if (pdrv->pm) { | |
693 | if (pdrv->pm->resume_noirq) | |
694 | ret = pdrv->pm->resume_noirq(dev); | |
695 | } else { | |
696 | ret = platform_legacy_resume_early(dev); | |
697 | } | |
698 | ||
699 | return ret; | |
700 | } | |
701 | ||
702 | #else /* !CONFIG_SUSPEND */ | |
703 | ||
704 | #define platform_pm_suspend NULL | |
705 | #define platform_pm_resume NULL | |
706 | #define platform_pm_suspend_noirq NULL | |
707 | #define platform_pm_resume_noirq NULL | |
708 | ||
709 | #endif /* !CONFIG_SUSPEND */ | |
710 | ||
711 | #ifdef CONFIG_HIBERNATION | |
712 | ||
713 | static int platform_pm_freeze(struct device *dev) | |
714 | { | |
715 | struct device_driver *drv = dev->driver; | |
716 | int ret = 0; | |
717 | ||
718 | if (!drv) | |
719 | return 0; | |
720 | ||
721 | if (drv->pm) { | |
722 | if (drv->pm->freeze) | |
723 | ret = drv->pm->freeze(dev); | |
724 | } else { | |
725 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
726 | } | |
727 | ||
728 | return ret; | |
729 | } | |
730 | ||
731 | static int platform_pm_freeze_noirq(struct device *dev) | |
732 | { | |
733 | struct platform_driver *pdrv; | |
734 | int ret = 0; | |
735 | ||
736 | if (!dev->driver) | |
737 | return 0; | |
738 | ||
739 | pdrv = to_platform_driver(dev->driver); | |
740 | if (pdrv->pm) { | |
741 | if (pdrv->pm->freeze_noirq) | |
742 | ret = pdrv->pm->freeze_noirq(dev); | |
743 | } else { | |
744 | ret = platform_legacy_suspend_late(dev, PMSG_FREEZE); | |
745 | } | |
746 | ||
747 | return ret; | |
748 | } | |
749 | ||
750 | static int platform_pm_thaw(struct device *dev) | |
751 | { | |
752 | struct device_driver *drv = dev->driver; | |
753 | int ret = 0; | |
754 | ||
755 | if (drv && drv->pm) { | |
756 | if (drv->pm->thaw) | |
757 | ret = drv->pm->thaw(dev); | |
758 | } else { | |
759 | ret = platform_legacy_resume(dev); | |
760 | } | |
761 | ||
762 | return ret; | |
763 | } | |
764 | ||
765 | static int platform_pm_thaw_noirq(struct device *dev) | |
766 | { | |
767 | struct platform_driver *pdrv; | |
768 | int ret = 0; | |
769 | ||
770 | if (!dev->driver) | |
771 | return 0; | |
772 | ||
773 | pdrv = to_platform_driver(dev->driver); | |
774 | if (pdrv->pm) { | |
775 | if (pdrv->pm->thaw_noirq) | |
776 | ret = pdrv->pm->thaw_noirq(dev); | |
777 | } else { | |
778 | ret = platform_legacy_resume_early(dev); | |
779 | } | |
780 | ||
781 | return ret; | |
782 | } | |
783 | ||
784 | static int platform_pm_poweroff(struct device *dev) | |
785 | { | |
786 | struct device_driver *drv = dev->driver; | |
787 | int ret = 0; | |
788 | ||
789 | if (drv && drv->pm) { | |
790 | if (drv->pm->poweroff) | |
791 | ret = drv->pm->poweroff(dev); | |
792 | } else { | |
793 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
794 | } | |
795 | ||
796 | return ret; | |
797 | } | |
798 | ||
799 | static int platform_pm_poweroff_noirq(struct device *dev) | |
800 | { | |
801 | struct platform_driver *pdrv; | |
802 | int ret = 0; | |
803 | ||
804 | if (!dev->driver) | |
805 | return 0; | |
806 | ||
807 | pdrv = to_platform_driver(dev->driver); | |
808 | if (pdrv->pm) { | |
809 | if (pdrv->pm->poweroff_noirq) | |
810 | ret = pdrv->pm->poweroff_noirq(dev); | |
811 | } else { | |
812 | ret = platform_legacy_suspend_late(dev, PMSG_HIBERNATE); | |
813 | } | |
814 | ||
815 | return ret; | |
816 | } | |
817 | ||
818 | static int platform_pm_restore(struct device *dev) | |
819 | { | |
820 | struct device_driver *drv = dev->driver; | |
821 | int ret = 0; | |
822 | ||
823 | if (drv && drv->pm) { | |
824 | if (drv->pm->restore) | |
825 | ret = drv->pm->restore(dev); | |
826 | } else { | |
827 | ret = platform_legacy_resume(dev); | |
828 | } | |
829 | ||
830 | return ret; | |
831 | } | |
832 | ||
833 | static int platform_pm_restore_noirq(struct device *dev) | |
834 | { | |
835 | struct platform_driver *pdrv; | |
836 | int ret = 0; | |
837 | ||
838 | if (!dev->driver) | |
839 | return 0; | |
840 | ||
841 | pdrv = to_platform_driver(dev->driver); | |
842 | if (pdrv->pm) { | |
843 | if (pdrv->pm->restore_noirq) | |
844 | ret = pdrv->pm->restore_noirq(dev); | |
845 | } else { | |
846 | ret = platform_legacy_resume_early(dev); | |
847 | } | |
848 | ||
849 | return ret; | |
850 | } | |
851 | ||
852 | #else /* !CONFIG_HIBERNATION */ | |
853 | ||
854 | #define platform_pm_freeze NULL | |
855 | #define platform_pm_thaw NULL | |
856 | #define platform_pm_poweroff NULL | |
857 | #define platform_pm_restore NULL | |
858 | #define platform_pm_freeze_noirq NULL | |
859 | #define platform_pm_thaw_noirq NULL | |
860 | #define platform_pm_poweroff_noirq NULL | |
861 | #define platform_pm_restore_noirq NULL | |
862 | ||
863 | #endif /* !CONFIG_HIBERNATION */ | |
864 | ||
865 | struct pm_ext_ops platform_pm_ops = { | |
866 | .base = { | |
867 | .prepare = platform_pm_prepare, | |
868 | .complete = platform_pm_complete, | |
869 | .suspend = platform_pm_suspend, | |
870 | .resume = platform_pm_resume, | |
871 | .freeze = platform_pm_freeze, | |
872 | .thaw = platform_pm_thaw, | |
873 | .poweroff = platform_pm_poweroff, | |
874 | .restore = platform_pm_restore, | |
875 | }, | |
876 | .suspend_noirq = platform_pm_suspend_noirq, | |
877 | .resume_noirq = platform_pm_resume_noirq, | |
878 | .freeze_noirq = platform_pm_freeze_noirq, | |
879 | .thaw_noirq = platform_pm_thaw_noirq, | |
880 | .poweroff_noirq = platform_pm_poweroff_noirq, | |
881 | .restore_noirq = platform_pm_restore_noirq, | |
882 | }; | |
883 | ||
884 | #define PLATFORM_PM_OPS_PTR &platform_pm_ops | |
885 | ||
886 | #else /* !CONFIG_PM_SLEEP */ | |
887 | ||
888 | #define PLATFORM_PM_OPS_PTR NULL | |
889 | ||
890 | #endif /* !CONFIG_PM_SLEEP */ | |
891 | ||
1da177e4 LT |
892 | struct bus_type platform_bus_type = { |
893 | .name = "platform", | |
a0245f7a | 894 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 895 | .match = platform_match, |
a0245f7a | 896 | .uevent = platform_uevent, |
25e18499 | 897 | .pm = PLATFORM_PM_OPS_PTR, |
1da177e4 | 898 | }; |
a96b2042 | 899 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
900 | |
901 | int __init platform_bus_init(void) | |
902 | { | |
fbfb1445 CH |
903 | int error; |
904 | ||
905 | error = device_register(&platform_bus); | |
906 | if (error) | |
907 | return error; | |
908 | error = bus_register(&platform_bus_type); | |
909 | if (error) | |
910 | device_unregister(&platform_bus); | |
911 | return error; | |
1da177e4 LT |
912 | } |
913 | ||
914 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
915 | u64 dma_get_required_mask(struct device *dev) | |
916 | { | |
917 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
918 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
919 | u64 mask; | |
920 | ||
921 | if (!high_totalram) { | |
922 | /* convert to mask just covering totalram */ | |
923 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
924 | low_totalram += low_totalram - 1; | |
925 | mask = low_totalram; | |
926 | } else { | |
927 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
928 | high_totalram += high_totalram - 1; | |
929 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
930 | } | |
e88a0c2c | 931 | return mask; |
1da177e4 LT |
932 | } |
933 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
934 | #endif |