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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 | ||
daa41226 | 13 | #include <linux/string.h> |
d052d1be | 14 | #include <linux/platform_device.h> |
05212157 | 15 | #include <linux/of_device.h> |
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <linux/init.h> | |
18 | #include <linux/dma-mapping.h> | |
19 | #include <linux/bootmem.h> | |
20 | #include <linux/err.h> | |
4e57b681 | 21 | #include <linux/slab.h> |
9d730229 | 22 | #include <linux/pm_runtime.h> |
1da177e4 | 23 | |
a1bdc7aa BD |
24 | #include "base.h" |
25 | ||
4a3ad20c GKH |
26 | #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \ |
27 | driver)) | |
00d3dcdd | 28 | |
1da177e4 | 29 | struct device platform_bus = { |
1e0b2cf9 | 30 | .init_name = "platform", |
1da177e4 | 31 | }; |
a96b2042 | 32 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 LT |
33 | |
34 | /** | |
4a3ad20c GKH |
35 | * platform_get_resource - get a resource for a device |
36 | * @dev: platform device | |
37 | * @type: resource type | |
38 | * @num: resource index | |
1da177e4 | 39 | */ |
4a3ad20c GKH |
40 | struct resource *platform_get_resource(struct platform_device *dev, |
41 | unsigned int type, unsigned int num) | |
1da177e4 LT |
42 | { |
43 | int i; | |
44 | ||
45 | for (i = 0; i < dev->num_resources; i++) { | |
46 | struct resource *r = &dev->resource[i]; | |
47 | ||
c9f66169 MD |
48 | if (type == resource_type(r) && num-- == 0) |
49 | return r; | |
1da177e4 LT |
50 | } |
51 | return NULL; | |
52 | } | |
a96b2042 | 53 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
54 | |
55 | /** | |
4a3ad20c GKH |
56 | * platform_get_irq - get an IRQ for a device |
57 | * @dev: platform device | |
58 | * @num: IRQ number index | |
1da177e4 LT |
59 | */ |
60 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
61 | { | |
62 | struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
63 | ||
305b3228 | 64 | return r ? r->start : -ENXIO; |
1da177e4 | 65 | } |
a96b2042 | 66 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
67 | |
68 | /** | |
4a3ad20c GKH |
69 | * platform_get_resource_byname - get a resource for a device by name |
70 | * @dev: platform device | |
71 | * @type: resource type | |
72 | * @name: resource name | |
1da177e4 | 73 | */ |
4a3ad20c | 74 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
75 | unsigned int type, |
76 | const char *name) | |
1da177e4 LT |
77 | { |
78 | int i; | |
79 | ||
80 | for (i = 0; i < dev->num_resources; i++) { | |
81 | struct resource *r = &dev->resource[i]; | |
82 | ||
c9f66169 MD |
83 | if (type == resource_type(r) && !strcmp(r->name, name)) |
84 | return r; | |
1da177e4 LT |
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 | 94 | */ |
c0afe7ba | 95 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
1da177e4 | 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 | /** |
3c31f07a | 132 | * platform_device_put - destroy a platform device |
4a3ad20c | 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 | /** | |
3c31f07a | 156 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
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 | /** | |
3c31f07a | 181 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
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 | 190 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 191 | const struct resource *res, unsigned int num) |
37c12e74 RK |
192 | { |
193 | struct resource *r; | |
194 | ||
5cfc64ce AV |
195 | if (!res) |
196 | return 0; | |
197 | ||
3e61dfd8 | 198 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); |
37c12e74 | 199 | if (r) { |
37c12e74 RK |
200 | pdev->resource = r; |
201 | pdev->num_resources = num; | |
3e61dfd8 | 202 | return 0; |
37c12e74 | 203 | } |
3e61dfd8 | 204 | return -ENOMEM; |
37c12e74 RK |
205 | } |
206 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
207 | ||
208 | /** | |
3c31f07a | 209 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
210 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
211 | * @data: platform specific data for this platform device | |
212 | * @size: size of platform specific data | |
37c12e74 | 213 | * |
4a3ad20c GKH |
214 | * Add a copy of platform specific data to the platform device's |
215 | * platform_data pointer. The memory associated with the platform data | |
216 | * will be freed when the platform device is released. | |
37c12e74 | 217 | */ |
4a3ad20c GKH |
218 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
219 | size_t size) | |
37c12e74 | 220 | { |
5cfc64ce AV |
221 | void *d; |
222 | ||
223 | if (!data) | |
224 | return 0; | |
37c12e74 | 225 | |
5cfc64ce | 226 | d = kmemdup(data, size, GFP_KERNEL); |
37c12e74 | 227 | if (d) { |
37c12e74 | 228 | pdev->dev.platform_data = d; |
daa41226 | 229 | return 0; |
37c12e74 | 230 | } |
daa41226 | 231 | return -ENOMEM; |
37c12e74 RK |
232 | } |
233 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
234 | ||
235 | /** | |
4a3ad20c GKH |
236 | * platform_device_add - add a platform device to device hierarchy |
237 | * @pdev: platform device we're adding | |
1da177e4 | 238 | * |
4a3ad20c GKH |
239 | * This is part 2 of platform_device_register(), though may be called |
240 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 241 | */ |
37c12e74 | 242 | int platform_device_add(struct platform_device *pdev) |
1da177e4 LT |
243 | { |
244 | int i, ret = 0; | |
245 | ||
246 | if (!pdev) | |
247 | return -EINVAL; | |
248 | ||
249 | if (!pdev->dev.parent) | |
250 | pdev->dev.parent = &platform_bus; | |
251 | ||
252 | pdev->dev.bus = &platform_bus_type; | |
253 | ||
254 | if (pdev->id != -1) | |
1e0b2cf9 | 255 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
1da177e4 | 256 | else |
acc0e90f | 257 | dev_set_name(&pdev->dev, "%s", pdev->name); |
1da177e4 LT |
258 | |
259 | for (i = 0; i < pdev->num_resources; i++) { | |
260 | struct resource *p, *r = &pdev->resource[i]; | |
261 | ||
262 | if (r->name == NULL) | |
1e0b2cf9 | 263 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
264 | |
265 | p = r->parent; | |
266 | if (!p) { | |
c9f66169 | 267 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 268 | p = &iomem_resource; |
c9f66169 | 269 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
270 | p = &ioport_resource; |
271 | } | |
272 | ||
d960bb4d | 273 | if (p && insert_resource(p, r)) { |
1da177e4 LT |
274 | printk(KERN_ERR |
275 | "%s: failed to claim resource %d\n", | |
1e0b2cf9 | 276 | dev_name(&pdev->dev), i); |
1da177e4 LT |
277 | ret = -EBUSY; |
278 | goto failed; | |
279 | } | |
280 | } | |
281 | ||
282 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 283 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 284 | |
e3915532 | 285 | ret = device_add(&pdev->dev); |
1da177e4 LT |
286 | if (ret == 0) |
287 | return ret; | |
288 | ||
289 | failed: | |
c9f66169 MD |
290 | while (--i >= 0) { |
291 | struct resource *r = &pdev->resource[i]; | |
292 | unsigned long type = resource_type(r); | |
293 | ||
294 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
295 | release_resource(r); | |
296 | } | |
297 | ||
1da177e4 LT |
298 | return ret; |
299 | } | |
37c12e74 RK |
300 | EXPORT_SYMBOL_GPL(platform_device_add); |
301 | ||
302 | /** | |
4a3ad20c GKH |
303 | * platform_device_del - remove a platform-level device |
304 | * @pdev: platform device we're removing | |
1da177e4 | 305 | * |
4a3ad20c GKH |
306 | * Note that this function will also release all memory- and port-based |
307 | * resources owned by the device (@dev->resource). This function must | |
308 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 309 | */ |
93ce3061 | 310 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
311 | { |
312 | int i; | |
313 | ||
314 | if (pdev) { | |
dc4c15d4 JD |
315 | device_del(&pdev->dev); |
316 | ||
1da177e4 LT |
317 | for (i = 0; i < pdev->num_resources; i++) { |
318 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
319 | unsigned long type = resource_type(r); |
320 | ||
321 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
322 | release_resource(r); |
323 | } | |
1da177e4 LT |
324 | } |
325 | } | |
93ce3061 DT |
326 | EXPORT_SYMBOL_GPL(platform_device_del); |
327 | ||
328 | /** | |
4a3ad20c GKH |
329 | * platform_device_register - add a platform-level device |
330 | * @pdev: platform device we're adding | |
93ce3061 | 331 | */ |
4a3ad20c | 332 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
333 | { |
334 | device_initialize(&pdev->dev); | |
335 | return platform_device_add(pdev); | |
336 | } | |
a96b2042 | 337 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
338 | |
339 | /** | |
4a3ad20c GKH |
340 | * platform_device_unregister - unregister a platform-level device |
341 | * @pdev: platform device we're unregistering | |
93ce3061 | 342 | * |
4a3ad20c GKH |
343 | * Unregistration is done in 2 steps. First we release all resources |
344 | * and remove it from the subsystem, then we drop reference count by | |
345 | * calling platform_device_put(). | |
93ce3061 | 346 | */ |
4a3ad20c | 347 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
348 | { |
349 | platform_device_del(pdev); | |
350 | platform_device_put(pdev); | |
351 | } | |
a96b2042 | 352 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 353 | |
1da177e4 | 354 | /** |
44f28bde UKK |
355 | * platform_device_register_resndata - add a platform-level device with |
356 | * resources and platform-specific data | |
49a4ec18 | 357 | * |
d8bf2540 DES |
358 | * @parent: parent device for the device we're adding |
359 | * @name: base name of the device we're adding | |
360 | * @id: instance id | |
44f28bde UKK |
361 | * @res: set of resources that needs to be allocated for the device |
362 | * @num: number of resources | |
d8bf2540 DES |
363 | * @data: platform specific data for this platform device |
364 | * @size: size of platform specific data | |
365 | * | |
f0eae0ed | 366 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 367 | */ |
737a3bb9 | 368 | struct platform_device *__init_or_module platform_device_register_resndata( |
d8bf2540 DES |
369 | struct device *parent, |
370 | const char *name, int id, | |
44f28bde | 371 | const struct resource *res, unsigned int num, |
d8bf2540 DES |
372 | const void *data, size_t size) |
373 | { | |
44f28bde | 374 | int ret = -ENOMEM; |
d8bf2540 | 375 | struct platform_device *pdev; |
d8bf2540 DES |
376 | |
377 | pdev = platform_device_alloc(name, id); | |
44f28bde UKK |
378 | if (!pdev) |
379 | goto err; | |
d8bf2540 DES |
380 | |
381 | pdev->dev.parent = parent; | |
382 | ||
44f28bde UKK |
383 | if (res) { |
384 | ret = platform_device_add_resources(pdev, res, num); | |
385 | if (ret) | |
386 | goto err; | |
387 | } | |
388 | ||
389 | if (data) { | |
390 | ret = platform_device_add_data(pdev, data, size); | |
391 | if (ret) | |
392 | goto err; | |
d8bf2540 DES |
393 | } |
394 | ||
44f28bde UKK |
395 | ret = platform_device_add(pdev); |
396 | if (ret) { | |
397 | err: | |
398 | platform_device_put(pdev); | |
399 | return ERR_PTR(ret); | |
400 | } | |
d8bf2540 DES |
401 | |
402 | return pdev; | |
d8bf2540 | 403 | } |
44f28bde | 404 | EXPORT_SYMBOL_GPL(platform_device_register_resndata); |
d8bf2540 | 405 | |
00d3dcdd RK |
406 | static int platform_drv_probe(struct device *_dev) |
407 | { | |
408 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
409 | struct platform_device *dev = to_platform_device(_dev); | |
410 | ||
411 | return drv->probe(dev); | |
412 | } | |
413 | ||
c67334fb DB |
414 | static int platform_drv_probe_fail(struct device *_dev) |
415 | { | |
416 | return -ENXIO; | |
417 | } | |
418 | ||
00d3dcdd RK |
419 | static int platform_drv_remove(struct device *_dev) |
420 | { | |
421 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
422 | struct platform_device *dev = to_platform_device(_dev); | |
423 | ||
424 | return drv->remove(dev); | |
425 | } | |
426 | ||
427 | static void platform_drv_shutdown(struct device *_dev) | |
428 | { | |
429 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
430 | struct platform_device *dev = to_platform_device(_dev); | |
431 | ||
432 | drv->shutdown(dev); | |
433 | } | |
434 | ||
00d3dcdd | 435 | /** |
3c31f07a | 436 | * platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 437 | * @drv: platform driver structure |
00d3dcdd RK |
438 | */ |
439 | int platform_driver_register(struct platform_driver *drv) | |
440 | { | |
441 | drv->driver.bus = &platform_bus_type; | |
442 | if (drv->probe) | |
443 | drv->driver.probe = platform_drv_probe; | |
444 | if (drv->remove) | |
445 | drv->driver.remove = platform_drv_remove; | |
446 | if (drv->shutdown) | |
447 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 448 | |
00d3dcdd RK |
449 | return driver_register(&drv->driver); |
450 | } | |
451 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
452 | ||
453 | /** | |
3c31f07a | 454 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 455 | * @drv: platform driver structure |
00d3dcdd RK |
456 | */ |
457 | void platform_driver_unregister(struct platform_driver *drv) | |
458 | { | |
459 | driver_unregister(&drv->driver); | |
460 | } | |
461 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
462 | ||
c67334fb DB |
463 | /** |
464 | * platform_driver_probe - register driver for non-hotpluggable device | |
465 | * @drv: platform driver structure | |
466 | * @probe: the driver probe routine, probably from an __init section | |
467 | * | |
468 | * Use this instead of platform_driver_register() when you know the device | |
469 | * is not hotpluggable and has already been registered, and you want to | |
470 | * remove its run-once probe() infrastructure from memory after the driver | |
471 | * has bound to the device. | |
472 | * | |
473 | * One typical use for this would be with drivers for controllers integrated | |
474 | * into system-on-chip processors, where the controller devices have been | |
475 | * configured as part of board setup. | |
476 | * | |
477 | * Returns zero if the driver registered and bound to a device, else returns | |
478 | * a negative error code and with the driver not registered. | |
479 | */ | |
c63e0783 | 480 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
481 | int (*probe)(struct platform_device *)) |
482 | { | |
483 | int retval, code; | |
484 | ||
1a6f2a75 DT |
485 | /* make sure driver won't have bind/unbind attributes */ |
486 | drv->driver.suppress_bind_attrs = true; | |
487 | ||
c67334fb DB |
488 | /* temporary section violation during probe() */ |
489 | drv->probe = probe; | |
490 | retval = code = platform_driver_register(drv); | |
491 | ||
1a6f2a75 DT |
492 | /* |
493 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
494 | * the list of drivers in order to probe new devices. Check to see |
495 | * if the probe was successful, and make sure any forced probes of | |
496 | * new devices fail. | |
497 | */ | |
d79d3244 | 498 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb | 499 | drv->probe = NULL; |
e5dd1278 | 500 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
501 | retval = -ENODEV; |
502 | drv->driver.probe = platform_drv_probe_fail; | |
d79d3244 | 503 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
504 | |
505 | if (code != retval) | |
506 | platform_driver_unregister(drv); | |
507 | return retval; | |
508 | } | |
509 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 510 | |
ecdf6ceb DT |
511 | /** |
512 | * platform_create_bundle - register driver and create corresponding device | |
513 | * @driver: platform driver structure | |
514 | * @probe: the driver probe routine, probably from an __init section | |
515 | * @res: set of resources that needs to be allocated for the device | |
516 | * @n_res: number of resources | |
517 | * @data: platform specific data for this platform device | |
518 | * @size: size of platform specific data | |
519 | * | |
520 | * Use this in legacy-style modules that probe hardware directly and | |
521 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
522 | * |
523 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb DT |
524 | */ |
525 | struct platform_device * __init_or_module platform_create_bundle( | |
526 | struct platform_driver *driver, | |
527 | int (*probe)(struct platform_device *), | |
528 | struct resource *res, unsigned int n_res, | |
529 | const void *data, size_t size) | |
530 | { | |
531 | struct platform_device *pdev; | |
532 | int error; | |
533 | ||
534 | pdev = platform_device_alloc(driver->driver.name, -1); | |
535 | if (!pdev) { | |
536 | error = -ENOMEM; | |
537 | goto err_out; | |
538 | } | |
539 | ||
540 | if (res) { | |
541 | error = platform_device_add_resources(pdev, res, n_res); | |
542 | if (error) | |
543 | goto err_pdev_put; | |
544 | } | |
545 | ||
546 | if (data) { | |
547 | error = platform_device_add_data(pdev, data, size); | |
548 | if (error) | |
549 | goto err_pdev_put; | |
550 | } | |
551 | ||
552 | error = platform_device_add(pdev); | |
553 | if (error) | |
554 | goto err_pdev_put; | |
555 | ||
556 | error = platform_driver_probe(driver, probe); | |
557 | if (error) | |
558 | goto err_pdev_del; | |
559 | ||
560 | return pdev; | |
561 | ||
562 | err_pdev_del: | |
563 | platform_device_del(pdev); | |
564 | err_pdev_put: | |
565 | platform_device_put(pdev); | |
566 | err_out: | |
567 | return ERR_PTR(error); | |
568 | } | |
569 | EXPORT_SYMBOL_GPL(platform_create_bundle); | |
570 | ||
a0245f7a DB |
571 | /* modalias support enables more hands-off userspace setup: |
572 | * (a) environment variable lets new-style hotplug events work once system is | |
573 | * fully running: "modprobe $MODALIAS" | |
574 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
575 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
576 | */ | |
4a3ad20c GKH |
577 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
578 | char *buf) | |
a0245f7a DB |
579 | { |
580 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 581 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
582 | |
583 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
584 | } | |
585 | ||
586 | static struct device_attribute platform_dev_attrs[] = { | |
587 | __ATTR_RO(modalias), | |
588 | __ATTR_NULL, | |
589 | }; | |
590 | ||
7eff2e7a | 591 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
592 | { |
593 | struct platform_device *pdev = to_platform_device(dev); | |
eca39301 GL |
594 | int rc; |
595 | ||
596 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
597 | rc = of_device_uevent(dev,env); | |
598 | if (rc != -ENODEV) | |
599 | return rc; | |
a0245f7a | 600 | |
57fee4a5 EM |
601 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
602 | (pdev->id_entry) ? pdev->id_entry->name : pdev->name); | |
a0245f7a DB |
603 | return 0; |
604 | } | |
605 | ||
57fee4a5 | 606 | static const struct platform_device_id *platform_match_id( |
831fad2f | 607 | const struct platform_device_id *id, |
57fee4a5 EM |
608 | struct platform_device *pdev) |
609 | { | |
610 | while (id->name[0]) { | |
611 | if (strcmp(pdev->name, id->name) == 0) { | |
612 | pdev->id_entry = id; | |
613 | return id; | |
614 | } | |
615 | id++; | |
616 | } | |
617 | return NULL; | |
618 | } | |
619 | ||
1da177e4 | 620 | /** |
4a3ad20c GKH |
621 | * platform_match - bind platform device to platform driver. |
622 | * @dev: device. | |
623 | * @drv: driver. | |
1da177e4 | 624 | * |
4a3ad20c GKH |
625 | * Platform device IDs are assumed to be encoded like this: |
626 | * "<name><instance>", where <name> is a short description of the type of | |
627 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
628 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
629 | * "<name>". So, extract the <name> from the platform_device structure, | |
630 | * and compare it against the name of the driver. Return whether they match | |
631 | * or not. | |
1da177e4 | 632 | */ |
4a3ad20c | 633 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 634 | { |
71b3e0c1 | 635 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
636 | struct platform_driver *pdrv = to_platform_driver(drv); |
637 | ||
05212157 GL |
638 | /* Attempt an OF style match first */ |
639 | if (of_driver_match_device(dev, drv)) | |
640 | return 1; | |
641 | ||
642 | /* Then try to match against the id table */ | |
57fee4a5 EM |
643 | if (pdrv->id_table) |
644 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 645 | |
57fee4a5 | 646 | /* fall-back to driver name match */ |
1e0b2cf9 | 647 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
648 | } |
649 | ||
25e18499 RW |
650 | #ifdef CONFIG_PM_SLEEP |
651 | ||
652 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 653 | { |
783ea7d4 MD |
654 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
655 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
656 | int ret = 0; |
657 | ||
783ea7d4 MD |
658 | if (dev->driver && pdrv->suspend) |
659 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
660 | |
661 | return ret; | |
662 | } | |
663 | ||
25e18499 | 664 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 665 | { |
783ea7d4 MD |
666 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
667 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
668 | int ret = 0; |
669 | ||
783ea7d4 MD |
670 | if (dev->driver && pdrv->resume) |
671 | ret = pdrv->resume(pdev); | |
9480e307 | 672 | |
1da177e4 LT |
673 | return ret; |
674 | } | |
675 | ||
25e18499 RW |
676 | static int platform_pm_prepare(struct device *dev) |
677 | { | |
678 | struct device_driver *drv = dev->driver; | |
679 | int ret = 0; | |
680 | ||
681 | if (drv && drv->pm && drv->pm->prepare) | |
682 | ret = drv->pm->prepare(dev); | |
683 | ||
684 | return ret; | |
685 | } | |
686 | ||
687 | static void platform_pm_complete(struct device *dev) | |
688 | { | |
689 | struct device_driver *drv = dev->driver; | |
690 | ||
691 | if (drv && drv->pm && drv->pm->complete) | |
692 | drv->pm->complete(dev); | |
693 | } | |
694 | ||
9d730229 MD |
695 | #else /* !CONFIG_PM_SLEEP */ |
696 | ||
697 | #define platform_pm_prepare NULL | |
698 | #define platform_pm_complete NULL | |
699 | ||
700 | #endif /* !CONFIG_PM_SLEEP */ | |
701 | ||
25e18499 RW |
702 | #ifdef CONFIG_SUSPEND |
703 | ||
190e8370 | 704 | int __weak platform_pm_suspend(struct device *dev) |
25e18499 RW |
705 | { |
706 | struct device_driver *drv = dev->driver; | |
707 | int ret = 0; | |
708 | ||
adf09493 RW |
709 | if (!drv) |
710 | return 0; | |
711 | ||
712 | if (drv->pm) { | |
25e18499 RW |
713 | if (drv->pm->suspend) |
714 | ret = drv->pm->suspend(dev); | |
715 | } else { | |
716 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
717 | } | |
718 | ||
719 | return ret; | |
720 | } | |
721 | ||
190e8370 | 722 | int __weak platform_pm_suspend_noirq(struct device *dev) |
25e18499 | 723 | { |
adf09493 | 724 | struct device_driver *drv = dev->driver; |
25e18499 RW |
725 | int ret = 0; |
726 | ||
adf09493 | 727 | if (!drv) |
25e18499 RW |
728 | return 0; |
729 | ||
adf09493 RW |
730 | if (drv->pm) { |
731 | if (drv->pm->suspend_noirq) | |
732 | ret = drv->pm->suspend_noirq(dev); | |
25e18499 RW |
733 | } |
734 | ||
735 | return ret; | |
736 | } | |
737 | ||
190e8370 | 738 | int __weak platform_pm_resume(struct device *dev) |
25e18499 RW |
739 | { |
740 | struct device_driver *drv = dev->driver; | |
741 | int ret = 0; | |
742 | ||
adf09493 RW |
743 | if (!drv) |
744 | return 0; | |
745 | ||
746 | if (drv->pm) { | |
25e18499 RW |
747 | if (drv->pm->resume) |
748 | ret = drv->pm->resume(dev); | |
749 | } else { | |
750 | ret = platform_legacy_resume(dev); | |
751 | } | |
752 | ||
753 | return ret; | |
754 | } | |
755 | ||
190e8370 | 756 | int __weak platform_pm_resume_noirq(struct device *dev) |
25e18499 | 757 | { |
adf09493 | 758 | struct device_driver *drv = dev->driver; |
25e18499 RW |
759 | int ret = 0; |
760 | ||
adf09493 | 761 | if (!drv) |
25e18499 RW |
762 | return 0; |
763 | ||
adf09493 RW |
764 | if (drv->pm) { |
765 | if (drv->pm->resume_noirq) | |
766 | ret = drv->pm->resume_noirq(dev); | |
25e18499 RW |
767 | } |
768 | ||
769 | return ret; | |
770 | } | |
771 | ||
772 | #else /* !CONFIG_SUSPEND */ | |
773 | ||
774 | #define platform_pm_suspend NULL | |
775 | #define platform_pm_resume NULL | |
776 | #define platform_pm_suspend_noirq NULL | |
777 | #define platform_pm_resume_noirq NULL | |
778 | ||
779 | #endif /* !CONFIG_SUSPEND */ | |
780 | ||
781 | #ifdef CONFIG_HIBERNATION | |
782 | ||
783 | static int platform_pm_freeze(struct device *dev) | |
784 | { | |
785 | struct device_driver *drv = dev->driver; | |
786 | int ret = 0; | |
787 | ||
788 | if (!drv) | |
789 | return 0; | |
790 | ||
791 | if (drv->pm) { | |
792 | if (drv->pm->freeze) | |
793 | ret = drv->pm->freeze(dev); | |
794 | } else { | |
795 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
796 | } | |
797 | ||
798 | return ret; | |
799 | } | |
800 | ||
801 | static int platform_pm_freeze_noirq(struct device *dev) | |
802 | { | |
adf09493 | 803 | struct device_driver *drv = dev->driver; |
25e18499 RW |
804 | int ret = 0; |
805 | ||
adf09493 | 806 | if (!drv) |
25e18499 RW |
807 | return 0; |
808 | ||
adf09493 RW |
809 | if (drv->pm) { |
810 | if (drv->pm->freeze_noirq) | |
811 | ret = drv->pm->freeze_noirq(dev); | |
25e18499 RW |
812 | } |
813 | ||
814 | return ret; | |
815 | } | |
816 | ||
817 | static int platform_pm_thaw(struct device *dev) | |
818 | { | |
819 | struct device_driver *drv = dev->driver; | |
820 | int ret = 0; | |
821 | ||
adf09493 RW |
822 | if (!drv) |
823 | return 0; | |
824 | ||
825 | if (drv->pm) { | |
25e18499 RW |
826 | if (drv->pm->thaw) |
827 | ret = drv->pm->thaw(dev); | |
828 | } else { | |
829 | ret = platform_legacy_resume(dev); | |
830 | } | |
831 | ||
832 | return ret; | |
833 | } | |
834 | ||
835 | static int platform_pm_thaw_noirq(struct device *dev) | |
836 | { | |
adf09493 | 837 | struct device_driver *drv = dev->driver; |
25e18499 RW |
838 | int ret = 0; |
839 | ||
adf09493 | 840 | if (!drv) |
25e18499 RW |
841 | return 0; |
842 | ||
adf09493 RW |
843 | if (drv->pm) { |
844 | if (drv->pm->thaw_noirq) | |
845 | ret = drv->pm->thaw_noirq(dev); | |
25e18499 RW |
846 | } |
847 | ||
848 | return ret; | |
849 | } | |
850 | ||
851 | static int platform_pm_poweroff(struct device *dev) | |
852 | { | |
853 | struct device_driver *drv = dev->driver; | |
854 | int ret = 0; | |
855 | ||
adf09493 RW |
856 | if (!drv) |
857 | return 0; | |
858 | ||
859 | if (drv->pm) { | |
25e18499 RW |
860 | if (drv->pm->poweroff) |
861 | ret = drv->pm->poweroff(dev); | |
862 | } else { | |
863 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
864 | } | |
865 | ||
866 | return ret; | |
867 | } | |
868 | ||
869 | static int platform_pm_poweroff_noirq(struct device *dev) | |
870 | { | |
adf09493 | 871 | struct device_driver *drv = dev->driver; |
25e18499 RW |
872 | int ret = 0; |
873 | ||
adf09493 | 874 | if (!drv) |
25e18499 RW |
875 | return 0; |
876 | ||
adf09493 RW |
877 | if (drv->pm) { |
878 | if (drv->pm->poweroff_noirq) | |
879 | ret = drv->pm->poweroff_noirq(dev); | |
25e18499 RW |
880 | } |
881 | ||
882 | return ret; | |
883 | } | |
884 | ||
885 | static int platform_pm_restore(struct device *dev) | |
886 | { | |
887 | struct device_driver *drv = dev->driver; | |
888 | int ret = 0; | |
889 | ||
adf09493 RW |
890 | if (!drv) |
891 | return 0; | |
892 | ||
893 | if (drv->pm) { | |
25e18499 RW |
894 | if (drv->pm->restore) |
895 | ret = drv->pm->restore(dev); | |
896 | } else { | |
897 | ret = platform_legacy_resume(dev); | |
898 | } | |
899 | ||
900 | return ret; | |
901 | } | |
902 | ||
903 | static int platform_pm_restore_noirq(struct device *dev) | |
904 | { | |
adf09493 | 905 | struct device_driver *drv = dev->driver; |
25e18499 RW |
906 | int ret = 0; |
907 | ||
adf09493 | 908 | if (!drv) |
25e18499 RW |
909 | return 0; |
910 | ||
adf09493 RW |
911 | if (drv->pm) { |
912 | if (drv->pm->restore_noirq) | |
913 | ret = drv->pm->restore_noirq(dev); | |
25e18499 RW |
914 | } |
915 | ||
916 | return ret; | |
917 | } | |
918 | ||
919 | #else /* !CONFIG_HIBERNATION */ | |
920 | ||
921 | #define platform_pm_freeze NULL | |
922 | #define platform_pm_thaw NULL | |
923 | #define platform_pm_poweroff NULL | |
924 | #define platform_pm_restore NULL | |
925 | #define platform_pm_freeze_noirq NULL | |
926 | #define platform_pm_thaw_noirq NULL | |
927 | #define platform_pm_poweroff_noirq NULL | |
928 | #define platform_pm_restore_noirq NULL | |
929 | ||
930 | #endif /* !CONFIG_HIBERNATION */ | |
931 | ||
9d730229 MD |
932 | #ifdef CONFIG_PM_RUNTIME |
933 | ||
934 | int __weak platform_pm_runtime_suspend(struct device *dev) | |
935 | { | |
543f2503 | 936 | return pm_generic_runtime_suspend(dev); |
9d730229 MD |
937 | }; |
938 | ||
939 | int __weak platform_pm_runtime_resume(struct device *dev) | |
940 | { | |
543f2503 | 941 | return pm_generic_runtime_resume(dev); |
9d730229 MD |
942 | }; |
943 | ||
944 | int __weak platform_pm_runtime_idle(struct device *dev) | |
945 | { | |
543f2503 | 946 | return pm_generic_runtime_idle(dev); |
9d730229 MD |
947 | }; |
948 | ||
949 | #else /* !CONFIG_PM_RUNTIME */ | |
950 | ||
951 | #define platform_pm_runtime_suspend NULL | |
952 | #define platform_pm_runtime_resume NULL | |
953 | #define platform_pm_runtime_idle NULL | |
954 | ||
955 | #endif /* !CONFIG_PM_RUNTIME */ | |
956 | ||
d9ab7716 | 957 | static const struct dev_pm_ops platform_dev_pm_ops = { |
adf09493 RW |
958 | .prepare = platform_pm_prepare, |
959 | .complete = platform_pm_complete, | |
960 | .suspend = platform_pm_suspend, | |
961 | .resume = platform_pm_resume, | |
962 | .freeze = platform_pm_freeze, | |
963 | .thaw = platform_pm_thaw, | |
964 | .poweroff = platform_pm_poweroff, | |
965 | .restore = platform_pm_restore, | |
25e18499 RW |
966 | .suspend_noirq = platform_pm_suspend_noirq, |
967 | .resume_noirq = platform_pm_resume_noirq, | |
968 | .freeze_noirq = platform_pm_freeze_noirq, | |
969 | .thaw_noirq = platform_pm_thaw_noirq, | |
970 | .poweroff_noirq = platform_pm_poweroff_noirq, | |
971 | .restore_noirq = platform_pm_restore_noirq, | |
9d730229 MD |
972 | .runtime_suspend = platform_pm_runtime_suspend, |
973 | .runtime_resume = platform_pm_runtime_resume, | |
974 | .runtime_idle = platform_pm_runtime_idle, | |
25e18499 RW |
975 | }; |
976 | ||
1da177e4 LT |
977 | struct bus_type platform_bus_type = { |
978 | .name = "platform", | |
a0245f7a | 979 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 980 | .match = platform_match, |
a0245f7a | 981 | .uevent = platform_uevent, |
9d730229 | 982 | .pm = &platform_dev_pm_ops, |
1da177e4 | 983 | }; |
a96b2042 | 984 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 | 985 | |
c64a0926 KH |
986 | /** |
987 | * platform_bus_get_pm_ops() - return pointer to busses dev_pm_ops | |
988 | * | |
989 | * This function can be used by platform code to get the current | |
990 | * set of dev_pm_ops functions used by the platform_bus_type. | |
991 | */ | |
992 | const struct dev_pm_ops * __init platform_bus_get_pm_ops(void) | |
993 | { | |
994 | return platform_bus_type.pm; | |
995 | } | |
996 | ||
997 | /** | |
998 | * platform_bus_set_pm_ops() - update dev_pm_ops for the platform_bus_type | |
999 | * | |
1000 | * @pm: pointer to new dev_pm_ops struct to be used for platform_bus_type | |
1001 | * | |
1002 | * Platform code can override the dev_pm_ops methods of | |
1003 | * platform_bus_type by using this function. It is expected that | |
1004 | * platform code will first do a platform_bus_get_pm_ops(), then | |
1005 | * kmemdup it, then customize selected methods and pass a pointer to | |
1006 | * the new struct dev_pm_ops to this function. | |
1007 | * | |
1008 | * Since platform-specific code is customizing methods for *all* | |
1009 | * devices (not just platform-specific devices) it is expected that | |
1010 | * any custom overrides of these functions will keep existing behavior | |
1011 | * and simply extend it. For example, any customization of the | |
1012 | * runtime PM methods should continue to call the pm_generic_* | |
1013 | * functions as the default ones do in addition to the | |
1014 | * platform-specific behavior. | |
1015 | */ | |
1016 | void __init platform_bus_set_pm_ops(const struct dev_pm_ops *pm) | |
1017 | { | |
1018 | platform_bus_type.pm = pm; | |
1019 | } | |
1020 | ||
1da177e4 LT |
1021 | int __init platform_bus_init(void) |
1022 | { | |
fbfb1445 CH |
1023 | int error; |
1024 | ||
13977091 MD |
1025 | early_platform_cleanup(); |
1026 | ||
fbfb1445 CH |
1027 | error = device_register(&platform_bus); |
1028 | if (error) | |
1029 | return error; | |
1030 | error = bus_register(&platform_bus_type); | |
1031 | if (error) | |
1032 | device_unregister(&platform_bus); | |
1033 | return error; | |
1da177e4 LT |
1034 | } |
1035 | ||
1036 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
1037 | u64 dma_get_required_mask(struct device *dev) | |
1038 | { | |
1039 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
1040 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
1041 | u64 mask; | |
1042 | ||
1043 | if (!high_totalram) { | |
1044 | /* convert to mask just covering totalram */ | |
1045 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
1046 | low_totalram += low_totalram - 1; | |
1047 | mask = low_totalram; | |
1048 | } else { | |
1049 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
1050 | high_totalram += high_totalram - 1; | |
1051 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
1052 | } | |
e88a0c2c | 1053 | return mask; |
1da177e4 LT |
1054 | } |
1055 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
1056 | #endif | |
13977091 MD |
1057 | |
1058 | static __initdata LIST_HEAD(early_platform_driver_list); | |
1059 | static __initdata LIST_HEAD(early_platform_device_list); | |
1060 | ||
1061 | /** | |
4d26e139 | 1062 | * early_platform_driver_register - register early platform driver |
d86c1302 | 1063 | * @epdrv: early_platform driver structure |
13977091 | 1064 | * @buf: string passed from early_param() |
4d26e139 MD |
1065 | * |
1066 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
1067 | */ |
1068 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
1069 | char *buf) | |
1070 | { | |
c60e0504 | 1071 | char *tmp; |
13977091 MD |
1072 | int n; |
1073 | ||
1074 | /* Simply add the driver to the end of the global list. | |
1075 | * Drivers will by default be put on the list in compiled-in order. | |
1076 | */ | |
1077 | if (!epdrv->list.next) { | |
1078 | INIT_LIST_HEAD(&epdrv->list); | |
1079 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
1080 | } | |
1081 | ||
1082 | /* If the user has specified device then make sure the driver | |
1083 | * gets prioritized. The driver of the last device specified on | |
1084 | * command line will be put first on the list. | |
1085 | */ | |
1086 | n = strlen(epdrv->pdrv->driver.name); | |
1087 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
1088 | list_move(&epdrv->list, &early_platform_driver_list); | |
1089 | ||
c60e0504 MD |
1090 | /* Allow passing parameters after device name */ |
1091 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 1092 | epdrv->requested_id = -1; |
c60e0504 MD |
1093 | else { |
1094 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
1095 | &tmp, 10); | |
1096 | ||
1097 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
1098 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
1099 | n = 0; | |
1100 | } else | |
1101 | n += strcspn(&buf[n + 1], ",") + 1; | |
1102 | } | |
1103 | ||
1104 | if (buf[n] == ',') | |
1105 | n++; | |
1106 | ||
1107 | if (epdrv->bufsize) { | |
1108 | memcpy(epdrv->buffer, &buf[n], | |
1109 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
1110 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
1111 | } | |
13977091 MD |
1112 | } |
1113 | ||
1114 | return 0; | |
1115 | } | |
1116 | ||
1117 | /** | |
4d26e139 | 1118 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
1119 | * @devs: array of early platform devices to add |
1120 | * @num: number of early platform devices in array | |
4d26e139 MD |
1121 | * |
1122 | * Used by early architecture code to register early platform devices and | |
1123 | * their platform data. | |
13977091 MD |
1124 | */ |
1125 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1126 | { | |
1127 | struct device *dev; | |
1128 | int i; | |
1129 | ||
1130 | /* simply add the devices to list */ | |
1131 | for (i = 0; i < num; i++) { | |
1132 | dev = &devs[i]->dev; | |
1133 | ||
1134 | if (!dev->devres_head.next) { | |
1135 | INIT_LIST_HEAD(&dev->devres_head); | |
1136 | list_add_tail(&dev->devres_head, | |
1137 | &early_platform_device_list); | |
1138 | } | |
1139 | } | |
1140 | } | |
1141 | ||
1142 | /** | |
4d26e139 | 1143 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 1144 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
1145 | * |
1146 | * Used by architecture code to register all early platform drivers | |
1147 | * for a certain class. If omitted then only early platform drivers | |
1148 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
1149 | */ |
1150 | void __init early_platform_driver_register_all(char *class_str) | |
1151 | { | |
1152 | /* The "class_str" parameter may or may not be present on the kernel | |
1153 | * command line. If it is present then there may be more than one | |
1154 | * matching parameter. | |
1155 | * | |
1156 | * Since we register our early platform drivers using early_param() | |
1157 | * we need to make sure that they also get registered in the case | |
1158 | * when the parameter is missing from the kernel command line. | |
1159 | * | |
1160 | * We use parse_early_options() to make sure the early_param() gets | |
1161 | * called at least once. The early_param() may be called more than | |
1162 | * once since the name of the preferred device may be specified on | |
1163 | * the kernel command line. early_platform_driver_register() handles | |
1164 | * this case for us. | |
1165 | */ | |
1166 | parse_early_options(class_str); | |
1167 | } | |
1168 | ||
1169 | /** | |
4d26e139 | 1170 | * early_platform_match - find early platform device matching driver |
d86c1302 | 1171 | * @epdrv: early platform driver structure |
13977091 MD |
1172 | * @id: id to match against |
1173 | */ | |
1174 | static __init struct platform_device * | |
1175 | early_platform_match(struct early_platform_driver *epdrv, int id) | |
1176 | { | |
1177 | struct platform_device *pd; | |
1178 | ||
1179 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1180 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1181 | if (pd->id == id) | |
1182 | return pd; | |
1183 | ||
1184 | return NULL; | |
1185 | } | |
1186 | ||
1187 | /** | |
4d26e139 | 1188 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1189 | * @epdrv: early platform driver structure |
13977091 MD |
1190 | * @id: return true if id or above exists |
1191 | */ | |
1192 | static __init int early_platform_left(struct early_platform_driver *epdrv, | |
1193 | int id) | |
1194 | { | |
1195 | struct platform_device *pd; | |
1196 | ||
1197 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1198 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1199 | if (pd->id >= id) | |
1200 | return 1; | |
1201 | ||
1202 | return 0; | |
1203 | } | |
1204 | ||
1205 | /** | |
4d26e139 | 1206 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1207 | * @class_str: string to identify early platform driver class |
1208 | * @id: id to match against | |
1209 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1210 | */ | |
1211 | static int __init early_platform_driver_probe_id(char *class_str, | |
1212 | int id, | |
1213 | int nr_probe) | |
1214 | { | |
1215 | struct early_platform_driver *epdrv; | |
1216 | struct platform_device *match; | |
1217 | int match_id; | |
1218 | int n = 0; | |
1219 | int left = 0; | |
1220 | ||
1221 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1222 | /* only use drivers matching our class_str */ | |
1223 | if (strcmp(class_str, epdrv->class_str)) | |
1224 | continue; | |
1225 | ||
1226 | if (id == -2) { | |
1227 | match_id = epdrv->requested_id; | |
1228 | left = 1; | |
1229 | ||
1230 | } else { | |
1231 | match_id = id; | |
1232 | left += early_platform_left(epdrv, id); | |
1233 | ||
1234 | /* skip requested id */ | |
1235 | switch (epdrv->requested_id) { | |
1236 | case EARLY_PLATFORM_ID_ERROR: | |
1237 | case EARLY_PLATFORM_ID_UNSET: | |
1238 | break; | |
1239 | default: | |
1240 | if (epdrv->requested_id == id) | |
1241 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1242 | } | |
1243 | } | |
1244 | ||
1245 | switch (match_id) { | |
1246 | case EARLY_PLATFORM_ID_ERROR: | |
1247 | pr_warning("%s: unable to parse %s parameter\n", | |
1248 | class_str, epdrv->pdrv->driver.name); | |
1249 | /* fall-through */ | |
1250 | case EARLY_PLATFORM_ID_UNSET: | |
1251 | match = NULL; | |
1252 | break; | |
1253 | default: | |
1254 | match = early_platform_match(epdrv, match_id); | |
1255 | } | |
1256 | ||
1257 | if (match) { | |
a636ee7f PM |
1258 | /* |
1259 | * Set up a sensible init_name to enable | |
1260 | * dev_name() and others to be used before the | |
1261 | * rest of the driver core is initialized. | |
1262 | */ | |
06fe53be | 1263 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1264 | if (match->id != -1) |
bd05086b PM |
1265 | match->dev.init_name = |
1266 | kasprintf(GFP_KERNEL, "%s.%d", | |
1267 | match->name, | |
1268 | match->id); | |
a636ee7f | 1269 | else |
bd05086b PM |
1270 | match->dev.init_name = |
1271 | kasprintf(GFP_KERNEL, "%s", | |
1272 | match->name); | |
a636ee7f | 1273 | |
a636ee7f PM |
1274 | if (!match->dev.init_name) |
1275 | return -ENOMEM; | |
1276 | } | |
bd05086b | 1277 | |
13977091 MD |
1278 | if (epdrv->pdrv->probe(match)) |
1279 | pr_warning("%s: unable to probe %s early.\n", | |
1280 | class_str, match->name); | |
1281 | else | |
1282 | n++; | |
1283 | } | |
1284 | ||
1285 | if (n >= nr_probe) | |
1286 | break; | |
1287 | } | |
1288 | ||
1289 | if (left) | |
1290 | return n; | |
1291 | else | |
1292 | return -ENODEV; | |
1293 | } | |
1294 | ||
1295 | /** | |
4d26e139 | 1296 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1297 | * @class_str: string to identify early platform driver class |
1298 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1299 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1300 | * |
1301 | * Used by architecture code to probe registered early platform drivers | |
1302 | * within a certain class. For probe to happen a registered early platform | |
1303 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1304 | */ |
1305 | int __init early_platform_driver_probe(char *class_str, | |
1306 | int nr_probe, | |
1307 | int user_only) | |
1308 | { | |
1309 | int k, n, i; | |
1310 | ||
1311 | n = 0; | |
1312 | for (i = -2; n < nr_probe; i++) { | |
1313 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1314 | ||
1315 | if (k < 0) | |
1316 | break; | |
1317 | ||
1318 | n += k; | |
1319 | ||
1320 | if (user_only) | |
1321 | break; | |
1322 | } | |
1323 | ||
1324 | return n; | |
1325 | } | |
1326 | ||
1327 | /** | |
1328 | * early_platform_cleanup - clean up early platform code | |
1329 | */ | |
1330 | void __init early_platform_cleanup(void) | |
1331 | { | |
1332 | struct platform_device *pd, *pd2; | |
1333 | ||
1334 | /* clean up the devres list used to chain devices */ | |
1335 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1336 | dev.devres_head) { | |
1337 | list_del(&pd->dev.devres_head); | |
1338 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1339 | } | |
1340 | } | |
1341 |