Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * platform.c - platform 'pseudo' bus for legacy devices | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * Please see Documentation/driver-model/platform.txt for more | |
10 | * information. | |
11 | */ | |
12 | ||
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 | 149 | |
7096d042 | 150 | of_device_node_put(&pa->pdev.dev); |
37c12e74 | 151 | kfree(pa->pdev.dev.platform_data); |
e710d7d5 | 152 | kfree(pa->pdev.mfd_cell); |
37c12e74 RK |
153 | kfree(pa->pdev.resource); |
154 | kfree(pa); | |
155 | } | |
156 | ||
157 | /** | |
3c31f07a | 158 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
159 | * @name: base name of the device we're adding |
160 | * @id: instance id | |
37c12e74 | 161 | * |
4a3ad20c GKH |
162 | * Create a platform device object which can have other objects attached |
163 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 164 | */ |
1359555e | 165 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
166 | { |
167 | struct platform_object *pa; | |
168 | ||
169 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); | |
170 | if (pa) { | |
171 | strcpy(pa->name, name); | |
172 | pa->pdev.name = pa->name; | |
173 | pa->pdev.id = id; | |
174 | device_initialize(&pa->pdev.dev); | |
175 | pa->pdev.dev.release = platform_device_release; | |
176 | } | |
177 | ||
93ce3061 | 178 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
179 | } |
180 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
181 | ||
182 | /** | |
3c31f07a | 183 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
184 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
185 | * @res: set of resources that needs to be allocated for the device | |
186 | * @num: number of resources | |
37c12e74 | 187 | * |
4a3ad20c GKH |
188 | * Add a copy of the resources to the platform device. The memory |
189 | * associated with the resources will be freed when the platform device is | |
190 | * released. | |
37c12e74 | 191 | */ |
4a3ad20c | 192 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 193 | const struct resource *res, unsigned int num) |
37c12e74 RK |
194 | { |
195 | struct resource *r; | |
196 | ||
5cfc64ce AV |
197 | if (!res) |
198 | return 0; | |
199 | ||
3e61dfd8 | 200 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); |
37c12e74 | 201 | if (r) { |
37c12e74 RK |
202 | pdev->resource = r; |
203 | pdev->num_resources = num; | |
3e61dfd8 | 204 | return 0; |
37c12e74 | 205 | } |
3e61dfd8 | 206 | return -ENOMEM; |
37c12e74 RK |
207 | } |
208 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
209 | ||
210 | /** | |
3c31f07a | 211 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
212 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
213 | * @data: platform specific data for this platform device | |
214 | * @size: size of platform specific data | |
37c12e74 | 215 | * |
4a3ad20c GKH |
216 | * Add a copy of platform specific data to the platform device's |
217 | * platform_data pointer. The memory associated with the platform data | |
218 | * will be freed when the platform device is released. | |
37c12e74 | 219 | */ |
4a3ad20c GKH |
220 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
221 | size_t size) | |
37c12e74 | 222 | { |
27a33f9e | 223 | void *d = NULL; |
5cfc64ce | 224 | |
27a33f9e UKK |
225 | if (data) { |
226 | d = kmemdup(data, size, GFP_KERNEL); | |
227 | if (!d) | |
228 | return -ENOMEM; | |
37c12e74 | 229 | } |
27a33f9e | 230 | |
251e031d | 231 | kfree(pdev->dev.platform_data); |
27a33f9e UKK |
232 | pdev->dev.platform_data = d; |
233 | return 0; | |
37c12e74 RK |
234 | } |
235 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
236 | ||
237 | /** | |
4a3ad20c GKH |
238 | * platform_device_add - add a platform device to device hierarchy |
239 | * @pdev: platform device we're adding | |
1da177e4 | 240 | * |
4a3ad20c GKH |
241 | * This is part 2 of platform_device_register(), though may be called |
242 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 243 | */ |
37c12e74 | 244 | int platform_device_add(struct platform_device *pdev) |
1da177e4 LT |
245 | { |
246 | int i, ret = 0; | |
247 | ||
248 | if (!pdev) | |
249 | return -EINVAL; | |
250 | ||
251 | if (!pdev->dev.parent) | |
252 | pdev->dev.parent = &platform_bus; | |
253 | ||
254 | pdev->dev.bus = &platform_bus_type; | |
255 | ||
256 | if (pdev->id != -1) | |
1e0b2cf9 | 257 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
1da177e4 | 258 | else |
acc0e90f | 259 | dev_set_name(&pdev->dev, "%s", pdev->name); |
1da177e4 LT |
260 | |
261 | for (i = 0; i < pdev->num_resources; i++) { | |
262 | struct resource *p, *r = &pdev->resource[i]; | |
263 | ||
264 | if (r->name == NULL) | |
1e0b2cf9 | 265 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
266 | |
267 | p = r->parent; | |
268 | if (!p) { | |
c9f66169 | 269 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 270 | p = &iomem_resource; |
c9f66169 | 271 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
272 | p = &ioport_resource; |
273 | } | |
274 | ||
d960bb4d | 275 | if (p && insert_resource(p, r)) { |
1da177e4 LT |
276 | printk(KERN_ERR |
277 | "%s: failed to claim resource %d\n", | |
1e0b2cf9 | 278 | dev_name(&pdev->dev), i); |
1da177e4 LT |
279 | ret = -EBUSY; |
280 | goto failed; | |
281 | } | |
282 | } | |
283 | ||
284 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 285 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 286 | |
e3915532 | 287 | ret = device_add(&pdev->dev); |
1da177e4 LT |
288 | if (ret == 0) |
289 | return ret; | |
290 | ||
291 | failed: | |
c9f66169 MD |
292 | while (--i >= 0) { |
293 | struct resource *r = &pdev->resource[i]; | |
294 | unsigned long type = resource_type(r); | |
295 | ||
296 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
297 | release_resource(r); | |
298 | } | |
299 | ||
1da177e4 LT |
300 | return ret; |
301 | } | |
37c12e74 RK |
302 | EXPORT_SYMBOL_GPL(platform_device_add); |
303 | ||
304 | /** | |
4a3ad20c GKH |
305 | * platform_device_del - remove a platform-level device |
306 | * @pdev: platform device we're removing | |
1da177e4 | 307 | * |
4a3ad20c GKH |
308 | * Note that this function will also release all memory- and port-based |
309 | * resources owned by the device (@dev->resource). This function must | |
310 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 311 | */ |
93ce3061 | 312 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
313 | { |
314 | int i; | |
315 | ||
316 | if (pdev) { | |
dc4c15d4 JD |
317 | device_del(&pdev->dev); |
318 | ||
1da177e4 LT |
319 | for (i = 0; i < pdev->num_resources; i++) { |
320 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
321 | unsigned long type = resource_type(r); |
322 | ||
323 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
324 | release_resource(r); |
325 | } | |
1da177e4 LT |
326 | } |
327 | } | |
93ce3061 DT |
328 | EXPORT_SYMBOL_GPL(platform_device_del); |
329 | ||
330 | /** | |
4a3ad20c GKH |
331 | * platform_device_register - add a platform-level device |
332 | * @pdev: platform device we're adding | |
93ce3061 | 333 | */ |
4a3ad20c | 334 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
335 | { |
336 | device_initialize(&pdev->dev); | |
337 | return platform_device_add(pdev); | |
338 | } | |
a96b2042 | 339 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
340 | |
341 | /** | |
4a3ad20c GKH |
342 | * platform_device_unregister - unregister a platform-level device |
343 | * @pdev: platform device we're unregistering | |
93ce3061 | 344 | * |
4a3ad20c GKH |
345 | * Unregistration is done in 2 steps. First we release all resources |
346 | * and remove it from the subsystem, then we drop reference count by | |
347 | * calling platform_device_put(). | |
93ce3061 | 348 | */ |
4a3ad20c | 349 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
350 | { |
351 | platform_device_del(pdev); | |
352 | platform_device_put(pdev); | |
353 | } | |
a96b2042 | 354 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 355 | |
1da177e4 | 356 | /** |
44f28bde UKK |
357 | * platform_device_register_resndata - add a platform-level device with |
358 | * resources and platform-specific data | |
49a4ec18 | 359 | * |
d8bf2540 DB |
360 | * @parent: parent device for the device we're adding |
361 | * @name: base name of the device we're adding | |
362 | * @id: instance id | |
44f28bde UKK |
363 | * @res: set of resources that needs to be allocated for the device |
364 | * @num: number of resources | |
d8bf2540 DB |
365 | * @data: platform specific data for this platform device |
366 | * @size: size of platform specific data | |
367 | * | |
f0eae0ed | 368 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 369 | */ |
737a3bb9 | 370 | struct platform_device *__init_or_module platform_device_register_resndata( |
d8bf2540 DB |
371 | struct device *parent, |
372 | const char *name, int id, | |
44f28bde | 373 | const struct resource *res, unsigned int num, |
d8bf2540 DB |
374 | const void *data, size_t size) |
375 | { | |
44f28bde | 376 | int ret = -ENOMEM; |
d8bf2540 | 377 | struct platform_device *pdev; |
d8bf2540 DB |
378 | |
379 | pdev = platform_device_alloc(name, id); | |
44f28bde UKK |
380 | if (!pdev) |
381 | goto err; | |
d8bf2540 DB |
382 | |
383 | pdev->dev.parent = parent; | |
384 | ||
807508c8 AV |
385 | ret = platform_device_add_resources(pdev, res, num); |
386 | if (ret) | |
387 | goto err; | |
44f28bde | 388 | |
807508c8 AV |
389 | ret = platform_device_add_data(pdev, data, size); |
390 | if (ret) | |
391 | goto err; | |
d8bf2540 | 392 | |
44f28bde UKK |
393 | ret = platform_device_add(pdev); |
394 | if (ret) { | |
395 | err: | |
396 | platform_device_put(pdev); | |
397 | return ERR_PTR(ret); | |
398 | } | |
d8bf2540 DB |
399 | |
400 | return pdev; | |
d8bf2540 | 401 | } |
44f28bde | 402 | EXPORT_SYMBOL_GPL(platform_device_register_resndata); |
d8bf2540 | 403 | |
00d3dcdd RK |
404 | static int platform_drv_probe(struct device *_dev) |
405 | { | |
406 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
407 | struct platform_device *dev = to_platform_device(_dev); | |
408 | ||
409 | return drv->probe(dev); | |
410 | } | |
411 | ||
c67334fb DB |
412 | static int platform_drv_probe_fail(struct device *_dev) |
413 | { | |
414 | return -ENXIO; | |
415 | } | |
416 | ||
00d3dcdd RK |
417 | static int platform_drv_remove(struct device *_dev) |
418 | { | |
419 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
420 | struct platform_device *dev = to_platform_device(_dev); | |
421 | ||
422 | return drv->remove(dev); | |
423 | } | |
424 | ||
425 | static void platform_drv_shutdown(struct device *_dev) | |
426 | { | |
427 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
428 | struct platform_device *dev = to_platform_device(_dev); | |
429 | ||
430 | drv->shutdown(dev); | |
431 | } | |
432 | ||
00d3dcdd | 433 | /** |
3c31f07a | 434 | * platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 435 | * @drv: platform driver structure |
00d3dcdd RK |
436 | */ |
437 | int platform_driver_register(struct platform_driver *drv) | |
438 | { | |
439 | drv->driver.bus = &platform_bus_type; | |
440 | if (drv->probe) | |
441 | drv->driver.probe = platform_drv_probe; | |
442 | if (drv->remove) | |
443 | drv->driver.remove = platform_drv_remove; | |
444 | if (drv->shutdown) | |
445 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 446 | |
00d3dcdd RK |
447 | return driver_register(&drv->driver); |
448 | } | |
449 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
450 | ||
451 | /** | |
3c31f07a | 452 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 453 | * @drv: platform driver structure |
00d3dcdd RK |
454 | */ |
455 | void platform_driver_unregister(struct platform_driver *drv) | |
456 | { | |
457 | driver_unregister(&drv->driver); | |
458 | } | |
459 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
460 | ||
c67334fb DB |
461 | /** |
462 | * platform_driver_probe - register driver for non-hotpluggable device | |
463 | * @drv: platform driver structure | |
464 | * @probe: the driver probe routine, probably from an __init section | |
465 | * | |
466 | * Use this instead of platform_driver_register() when you know the device | |
467 | * is not hotpluggable and has already been registered, and you want to | |
468 | * remove its run-once probe() infrastructure from memory after the driver | |
469 | * has bound to the device. | |
470 | * | |
471 | * One typical use for this would be with drivers for controllers integrated | |
472 | * into system-on-chip processors, where the controller devices have been | |
473 | * configured as part of board setup. | |
474 | * | |
475 | * Returns zero if the driver registered and bound to a device, else returns | |
476 | * a negative error code and with the driver not registered. | |
477 | */ | |
c63e0783 | 478 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
479 | int (*probe)(struct platform_device *)) |
480 | { | |
481 | int retval, code; | |
482 | ||
1a6f2a75 DT |
483 | /* make sure driver won't have bind/unbind attributes */ |
484 | drv->driver.suppress_bind_attrs = true; | |
485 | ||
c67334fb DB |
486 | /* temporary section violation during probe() */ |
487 | drv->probe = probe; | |
488 | retval = code = platform_driver_register(drv); | |
489 | ||
1a6f2a75 DT |
490 | /* |
491 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
492 | * the list of drivers in order to probe new devices. Check to see |
493 | * if the probe was successful, and make sure any forced probes of | |
494 | * new devices fail. | |
495 | */ | |
d79d3244 | 496 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb | 497 | drv->probe = NULL; |
e5dd1278 | 498 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
499 | retval = -ENODEV; |
500 | drv->driver.probe = platform_drv_probe_fail; | |
d79d3244 | 501 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
502 | |
503 | if (code != retval) | |
504 | platform_driver_unregister(drv); | |
505 | return retval; | |
506 | } | |
507 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 508 | |
ecdf6ceb DT |
509 | /** |
510 | * platform_create_bundle - register driver and create corresponding device | |
511 | * @driver: platform driver structure | |
512 | * @probe: the driver probe routine, probably from an __init section | |
513 | * @res: set of resources that needs to be allocated for the device | |
514 | * @n_res: number of resources | |
515 | * @data: platform specific data for this platform device | |
516 | * @size: size of platform specific data | |
517 | * | |
518 | * Use this in legacy-style modules that probe hardware directly and | |
519 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
520 | * |
521 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb DT |
522 | */ |
523 | struct platform_device * __init_or_module platform_create_bundle( | |
524 | struct platform_driver *driver, | |
525 | int (*probe)(struct platform_device *), | |
526 | struct resource *res, unsigned int n_res, | |
527 | const void *data, size_t size) | |
528 | { | |
529 | struct platform_device *pdev; | |
530 | int error; | |
531 | ||
532 | pdev = platform_device_alloc(driver->driver.name, -1); | |
533 | if (!pdev) { | |
534 | error = -ENOMEM; | |
535 | goto err_out; | |
536 | } | |
537 | ||
807508c8 AV |
538 | error = platform_device_add_resources(pdev, res, n_res); |
539 | if (error) | |
540 | goto err_pdev_put; | |
ecdf6ceb | 541 | |
807508c8 AV |
542 | error = platform_device_add_data(pdev, data, size); |
543 | if (error) | |
544 | goto err_pdev_put; | |
ecdf6ceb DT |
545 | |
546 | error = platform_device_add(pdev); | |
547 | if (error) | |
548 | goto err_pdev_put; | |
549 | ||
550 | error = platform_driver_probe(driver, probe); | |
551 | if (error) | |
552 | goto err_pdev_del; | |
553 | ||
554 | return pdev; | |
555 | ||
556 | err_pdev_del: | |
557 | platform_device_del(pdev); | |
558 | err_pdev_put: | |
559 | platform_device_put(pdev); | |
560 | err_out: | |
561 | return ERR_PTR(error); | |
562 | } | |
563 | EXPORT_SYMBOL_GPL(platform_create_bundle); | |
564 | ||
a0245f7a DB |
565 | /* modalias support enables more hands-off userspace setup: |
566 | * (a) environment variable lets new-style hotplug events work once system is | |
567 | * fully running: "modprobe $MODALIAS" | |
568 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
569 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
570 | */ | |
4a3ad20c GKH |
571 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
572 | char *buf) | |
a0245f7a DB |
573 | { |
574 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 575 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
576 | |
577 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
578 | } | |
579 | ||
580 | static struct device_attribute platform_dev_attrs[] = { | |
581 | __ATTR_RO(modalias), | |
582 | __ATTR_NULL, | |
583 | }; | |
584 | ||
7eff2e7a | 585 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
586 | { |
587 | struct platform_device *pdev = to_platform_device(dev); | |
eca39301 GL |
588 | int rc; |
589 | ||
590 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
591 | rc = of_device_uevent(dev,env); | |
592 | if (rc != -ENODEV) | |
593 | return rc; | |
a0245f7a | 594 | |
57fee4a5 EM |
595 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
596 | (pdev->id_entry) ? pdev->id_entry->name : pdev->name); | |
a0245f7a DB |
597 | return 0; |
598 | } | |
599 | ||
57fee4a5 | 600 | static const struct platform_device_id *platform_match_id( |
831fad2f | 601 | const struct platform_device_id *id, |
57fee4a5 EM |
602 | struct platform_device *pdev) |
603 | { | |
604 | while (id->name[0]) { | |
605 | if (strcmp(pdev->name, id->name) == 0) { | |
606 | pdev->id_entry = id; | |
607 | return id; | |
608 | } | |
609 | id++; | |
610 | } | |
611 | return NULL; | |
612 | } | |
613 | ||
1da177e4 | 614 | /** |
4a3ad20c GKH |
615 | * platform_match - bind platform device to platform driver. |
616 | * @dev: device. | |
617 | * @drv: driver. | |
1da177e4 | 618 | * |
4a3ad20c GKH |
619 | * Platform device IDs are assumed to be encoded like this: |
620 | * "<name><instance>", where <name> is a short description of the type of | |
621 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
622 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
623 | * "<name>". So, extract the <name> from the platform_device structure, | |
624 | * and compare it against the name of the driver. Return whether they match | |
625 | * or not. | |
1da177e4 | 626 | */ |
4a3ad20c | 627 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 628 | { |
71b3e0c1 | 629 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
630 | struct platform_driver *pdrv = to_platform_driver(drv); |
631 | ||
05212157 GL |
632 | /* Attempt an OF style match first */ |
633 | if (of_driver_match_device(dev, drv)) | |
634 | return 1; | |
635 | ||
636 | /* Then try to match against the id table */ | |
57fee4a5 EM |
637 | if (pdrv->id_table) |
638 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 639 | |
57fee4a5 | 640 | /* fall-back to driver name match */ |
1e0b2cf9 | 641 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
642 | } |
643 | ||
25e18499 RW |
644 | #ifdef CONFIG_PM_SLEEP |
645 | ||
646 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 647 | { |
783ea7d4 MD |
648 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
649 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
650 | int ret = 0; |
651 | ||
783ea7d4 MD |
652 | if (dev->driver && pdrv->suspend) |
653 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
654 | |
655 | return ret; | |
656 | } | |
657 | ||
25e18499 | 658 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 659 | { |
783ea7d4 MD |
660 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
661 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
662 | int ret = 0; |
663 | ||
783ea7d4 MD |
664 | if (dev->driver && pdrv->resume) |
665 | ret = pdrv->resume(pdev); | |
9480e307 | 666 | |
1da177e4 LT |
667 | return ret; |
668 | } | |
669 | ||
25e18499 RW |
670 | static int platform_pm_prepare(struct device *dev) |
671 | { | |
672 | struct device_driver *drv = dev->driver; | |
673 | int ret = 0; | |
674 | ||
675 | if (drv && drv->pm && drv->pm->prepare) | |
676 | ret = drv->pm->prepare(dev); | |
677 | ||
678 | return ret; | |
679 | } | |
680 | ||
681 | static void platform_pm_complete(struct device *dev) | |
682 | { | |
683 | struct device_driver *drv = dev->driver; | |
684 | ||
685 | if (drv && drv->pm && drv->pm->complete) | |
686 | drv->pm->complete(dev); | |
687 | } | |
688 | ||
9d730229 MD |
689 | #else /* !CONFIG_PM_SLEEP */ |
690 | ||
691 | #define platform_pm_prepare NULL | |
692 | #define platform_pm_complete NULL | |
693 | ||
694 | #endif /* !CONFIG_PM_SLEEP */ | |
695 | ||
25e18499 RW |
696 | #ifdef CONFIG_SUSPEND |
697 | ||
190e8370 | 698 | int __weak platform_pm_suspend(struct device *dev) |
25e18499 RW |
699 | { |
700 | struct device_driver *drv = dev->driver; | |
701 | int ret = 0; | |
702 | ||
adf09493 RW |
703 | if (!drv) |
704 | return 0; | |
705 | ||
706 | if (drv->pm) { | |
25e18499 RW |
707 | if (drv->pm->suspend) |
708 | ret = drv->pm->suspend(dev); | |
709 | } else { | |
710 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
711 | } | |
712 | ||
713 | return ret; | |
714 | } | |
715 | ||
190e8370 | 716 | int __weak platform_pm_suspend_noirq(struct device *dev) |
25e18499 | 717 | { |
adf09493 | 718 | struct device_driver *drv = dev->driver; |
25e18499 RW |
719 | int ret = 0; |
720 | ||
adf09493 | 721 | if (!drv) |
25e18499 RW |
722 | return 0; |
723 | ||
adf09493 RW |
724 | if (drv->pm) { |
725 | if (drv->pm->suspend_noirq) | |
726 | ret = drv->pm->suspend_noirq(dev); | |
25e18499 RW |
727 | } |
728 | ||
729 | return ret; | |
730 | } | |
731 | ||
190e8370 | 732 | int __weak platform_pm_resume(struct device *dev) |
25e18499 RW |
733 | { |
734 | struct device_driver *drv = dev->driver; | |
735 | int ret = 0; | |
736 | ||
adf09493 RW |
737 | if (!drv) |
738 | return 0; | |
739 | ||
740 | if (drv->pm) { | |
25e18499 RW |
741 | if (drv->pm->resume) |
742 | ret = drv->pm->resume(dev); | |
743 | } else { | |
744 | ret = platform_legacy_resume(dev); | |
745 | } | |
746 | ||
747 | return ret; | |
748 | } | |
749 | ||
190e8370 | 750 | int __weak platform_pm_resume_noirq(struct device *dev) |
25e18499 | 751 | { |
adf09493 | 752 | struct device_driver *drv = dev->driver; |
25e18499 RW |
753 | int ret = 0; |
754 | ||
adf09493 | 755 | if (!drv) |
25e18499 RW |
756 | return 0; |
757 | ||
adf09493 RW |
758 | if (drv->pm) { |
759 | if (drv->pm->resume_noirq) | |
760 | ret = drv->pm->resume_noirq(dev); | |
25e18499 RW |
761 | } |
762 | ||
763 | return ret; | |
764 | } | |
765 | ||
766 | #else /* !CONFIG_SUSPEND */ | |
767 | ||
768 | #define platform_pm_suspend NULL | |
769 | #define platform_pm_resume NULL | |
770 | #define platform_pm_suspend_noirq NULL | |
771 | #define platform_pm_resume_noirq NULL | |
772 | ||
773 | #endif /* !CONFIG_SUSPEND */ | |
774 | ||
1f112cee | 775 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 RW |
776 | |
777 | static int platform_pm_freeze(struct device *dev) | |
778 | { | |
779 | struct device_driver *drv = dev->driver; | |
780 | int ret = 0; | |
781 | ||
782 | if (!drv) | |
783 | return 0; | |
784 | ||
785 | if (drv->pm) { | |
786 | if (drv->pm->freeze) | |
787 | ret = drv->pm->freeze(dev); | |
788 | } else { | |
789 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
790 | } | |
791 | ||
792 | return ret; | |
793 | } | |
794 | ||
795 | static int platform_pm_freeze_noirq(struct device *dev) | |
796 | { | |
adf09493 | 797 | struct device_driver *drv = dev->driver; |
25e18499 RW |
798 | int ret = 0; |
799 | ||
adf09493 | 800 | if (!drv) |
25e18499 RW |
801 | return 0; |
802 | ||
adf09493 RW |
803 | if (drv->pm) { |
804 | if (drv->pm->freeze_noirq) | |
805 | ret = drv->pm->freeze_noirq(dev); | |
25e18499 RW |
806 | } |
807 | ||
808 | return ret; | |
809 | } | |
810 | ||
811 | static int platform_pm_thaw(struct device *dev) | |
812 | { | |
813 | struct device_driver *drv = dev->driver; | |
814 | int ret = 0; | |
815 | ||
adf09493 RW |
816 | if (!drv) |
817 | return 0; | |
818 | ||
819 | if (drv->pm) { | |
25e18499 RW |
820 | if (drv->pm->thaw) |
821 | ret = drv->pm->thaw(dev); | |
822 | } else { | |
823 | ret = platform_legacy_resume(dev); | |
824 | } | |
825 | ||
826 | return ret; | |
827 | } | |
828 | ||
829 | static int platform_pm_thaw_noirq(struct device *dev) | |
830 | { | |
adf09493 | 831 | struct device_driver *drv = dev->driver; |
25e18499 RW |
832 | int ret = 0; |
833 | ||
adf09493 | 834 | if (!drv) |
25e18499 RW |
835 | return 0; |
836 | ||
adf09493 RW |
837 | if (drv->pm) { |
838 | if (drv->pm->thaw_noirq) | |
839 | ret = drv->pm->thaw_noirq(dev); | |
25e18499 RW |
840 | } |
841 | ||
842 | return ret; | |
843 | } | |
844 | ||
845 | static int platform_pm_poweroff(struct device *dev) | |
846 | { | |
847 | struct device_driver *drv = dev->driver; | |
848 | int ret = 0; | |
849 | ||
adf09493 RW |
850 | if (!drv) |
851 | return 0; | |
852 | ||
853 | if (drv->pm) { | |
25e18499 RW |
854 | if (drv->pm->poweroff) |
855 | ret = drv->pm->poweroff(dev); | |
856 | } else { | |
857 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
858 | } | |
859 | ||
860 | return ret; | |
861 | } | |
862 | ||
863 | static int platform_pm_poweroff_noirq(struct device *dev) | |
864 | { | |
adf09493 | 865 | struct device_driver *drv = dev->driver; |
25e18499 RW |
866 | int ret = 0; |
867 | ||
adf09493 | 868 | if (!drv) |
25e18499 RW |
869 | return 0; |
870 | ||
adf09493 RW |
871 | if (drv->pm) { |
872 | if (drv->pm->poweroff_noirq) | |
873 | ret = drv->pm->poweroff_noirq(dev); | |
25e18499 RW |
874 | } |
875 | ||
876 | return ret; | |
877 | } | |
878 | ||
879 | static int platform_pm_restore(struct device *dev) | |
880 | { | |
881 | struct device_driver *drv = dev->driver; | |
882 | int ret = 0; | |
883 | ||
adf09493 RW |
884 | if (!drv) |
885 | return 0; | |
886 | ||
887 | if (drv->pm) { | |
25e18499 RW |
888 | if (drv->pm->restore) |
889 | ret = drv->pm->restore(dev); | |
890 | } else { | |
891 | ret = platform_legacy_resume(dev); | |
892 | } | |
893 | ||
894 | return ret; | |
895 | } | |
896 | ||
897 | static int platform_pm_restore_noirq(struct device *dev) | |
898 | { | |
adf09493 | 899 | struct device_driver *drv = dev->driver; |
25e18499 RW |
900 | int ret = 0; |
901 | ||
adf09493 | 902 | if (!drv) |
25e18499 RW |
903 | return 0; |
904 | ||
adf09493 RW |
905 | if (drv->pm) { |
906 | if (drv->pm->restore_noirq) | |
907 | ret = drv->pm->restore_noirq(dev); | |
25e18499 RW |
908 | } |
909 | ||
910 | return ret; | |
911 | } | |
912 | ||
1f112cee | 913 | #else /* !CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 RW |
914 | |
915 | #define platform_pm_freeze NULL | |
916 | #define platform_pm_thaw NULL | |
917 | #define platform_pm_poweroff NULL | |
918 | #define platform_pm_restore NULL | |
919 | #define platform_pm_freeze_noirq NULL | |
920 | #define platform_pm_thaw_noirq NULL | |
921 | #define platform_pm_poweroff_noirq NULL | |
922 | #define platform_pm_restore_noirq NULL | |
923 | ||
1f112cee | 924 | #endif /* !CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 925 | |
9d730229 MD |
926 | #ifdef CONFIG_PM_RUNTIME |
927 | ||
928 | int __weak platform_pm_runtime_suspend(struct device *dev) | |
929 | { | |
543f2503 | 930 | return pm_generic_runtime_suspend(dev); |
9d730229 MD |
931 | }; |
932 | ||
933 | int __weak platform_pm_runtime_resume(struct device *dev) | |
934 | { | |
543f2503 | 935 | return pm_generic_runtime_resume(dev); |
9d730229 MD |
936 | }; |
937 | ||
938 | int __weak platform_pm_runtime_idle(struct device *dev) | |
939 | { | |
543f2503 | 940 | return pm_generic_runtime_idle(dev); |
9d730229 MD |
941 | }; |
942 | ||
943 | #else /* !CONFIG_PM_RUNTIME */ | |
944 | ||
945 | #define platform_pm_runtime_suspend NULL | |
946 | #define platform_pm_runtime_resume NULL | |
947 | #define platform_pm_runtime_idle NULL | |
948 | ||
949 | #endif /* !CONFIG_PM_RUNTIME */ | |
950 | ||
d9ab7716 | 951 | static const struct dev_pm_ops platform_dev_pm_ops = { |
adf09493 RW |
952 | .prepare = platform_pm_prepare, |
953 | .complete = platform_pm_complete, | |
954 | .suspend = platform_pm_suspend, | |
955 | .resume = platform_pm_resume, | |
956 | .freeze = platform_pm_freeze, | |
957 | .thaw = platform_pm_thaw, | |
958 | .poweroff = platform_pm_poweroff, | |
959 | .restore = platform_pm_restore, | |
25e18499 RW |
960 | .suspend_noirq = platform_pm_suspend_noirq, |
961 | .resume_noirq = platform_pm_resume_noirq, | |
962 | .freeze_noirq = platform_pm_freeze_noirq, | |
963 | .thaw_noirq = platform_pm_thaw_noirq, | |
964 | .poweroff_noirq = platform_pm_poweroff_noirq, | |
965 | .restore_noirq = platform_pm_restore_noirq, | |
9d730229 MD |
966 | .runtime_suspend = platform_pm_runtime_suspend, |
967 | .runtime_resume = platform_pm_runtime_resume, | |
968 | .runtime_idle = platform_pm_runtime_idle, | |
25e18499 RW |
969 | }; |
970 | ||
1da177e4 LT |
971 | struct bus_type platform_bus_type = { |
972 | .name = "platform", | |
a0245f7a | 973 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 974 | .match = platform_match, |
a0245f7a | 975 | .uevent = platform_uevent, |
9d730229 | 976 | .pm = &platform_dev_pm_ops, |
1da177e4 | 977 | }; |
a96b2042 | 978 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 | 979 | |
c64a0926 KH |
980 | /** |
981 | * platform_bus_get_pm_ops() - return pointer to busses dev_pm_ops | |
982 | * | |
983 | * This function can be used by platform code to get the current | |
984 | * set of dev_pm_ops functions used by the platform_bus_type. | |
985 | */ | |
986 | const struct dev_pm_ops * __init platform_bus_get_pm_ops(void) | |
987 | { | |
988 | return platform_bus_type.pm; | |
989 | } | |
990 | ||
991 | /** | |
992 | * platform_bus_set_pm_ops() - update dev_pm_ops for the platform_bus_type | |
993 | * | |
994 | * @pm: pointer to new dev_pm_ops struct to be used for platform_bus_type | |
995 | * | |
996 | * Platform code can override the dev_pm_ops methods of | |
997 | * platform_bus_type by using this function. It is expected that | |
998 | * platform code will first do a platform_bus_get_pm_ops(), then | |
999 | * kmemdup it, then customize selected methods and pass a pointer to | |
1000 | * the new struct dev_pm_ops to this function. | |
1001 | * | |
1002 | * Since platform-specific code is customizing methods for *all* | |
1003 | * devices (not just platform-specific devices) it is expected that | |
1004 | * any custom overrides of these functions will keep existing behavior | |
1005 | * and simply extend it. For example, any customization of the | |
1006 | * runtime PM methods should continue to call the pm_generic_* | |
1007 | * functions as the default ones do in addition to the | |
1008 | * platform-specific behavior. | |
1009 | */ | |
1010 | void __init platform_bus_set_pm_ops(const struct dev_pm_ops *pm) | |
1011 | { | |
1012 | platform_bus_type.pm = pm; | |
1013 | } | |
1014 | ||
1da177e4 LT |
1015 | int __init platform_bus_init(void) |
1016 | { | |
fbfb1445 CH |
1017 | int error; |
1018 | ||
13977091 MD |
1019 | early_platform_cleanup(); |
1020 | ||
fbfb1445 CH |
1021 | error = device_register(&platform_bus); |
1022 | if (error) | |
1023 | return error; | |
1024 | error = bus_register(&platform_bus_type); | |
1025 | if (error) | |
1026 | device_unregister(&platform_bus); | |
1027 | return error; | |
1da177e4 LT |
1028 | } |
1029 | ||
1030 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
1031 | u64 dma_get_required_mask(struct device *dev) | |
1032 | { | |
1033 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
1034 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
1035 | u64 mask; | |
1036 | ||
1037 | if (!high_totalram) { | |
1038 | /* convert to mask just covering totalram */ | |
1039 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
1040 | low_totalram += low_totalram - 1; | |
1041 | mask = low_totalram; | |
1042 | } else { | |
1043 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
1044 | high_totalram += high_totalram - 1; | |
1045 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
1046 | } | |
e88a0c2c | 1047 | return mask; |
1da177e4 LT |
1048 | } |
1049 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
1050 | #endif | |
13977091 MD |
1051 | |
1052 | static __initdata LIST_HEAD(early_platform_driver_list); | |
1053 | static __initdata LIST_HEAD(early_platform_device_list); | |
1054 | ||
1055 | /** | |
4d26e139 | 1056 | * early_platform_driver_register - register early platform driver |
d86c1302 | 1057 | * @epdrv: early_platform driver structure |
13977091 | 1058 | * @buf: string passed from early_param() |
4d26e139 MD |
1059 | * |
1060 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
1061 | */ |
1062 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
1063 | char *buf) | |
1064 | { | |
c60e0504 | 1065 | char *tmp; |
13977091 MD |
1066 | int n; |
1067 | ||
1068 | /* Simply add the driver to the end of the global list. | |
1069 | * Drivers will by default be put on the list in compiled-in order. | |
1070 | */ | |
1071 | if (!epdrv->list.next) { | |
1072 | INIT_LIST_HEAD(&epdrv->list); | |
1073 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
1074 | } | |
1075 | ||
1076 | /* If the user has specified device then make sure the driver | |
1077 | * gets prioritized. The driver of the last device specified on | |
1078 | * command line will be put first on the list. | |
1079 | */ | |
1080 | n = strlen(epdrv->pdrv->driver.name); | |
1081 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
1082 | list_move(&epdrv->list, &early_platform_driver_list); | |
1083 | ||
c60e0504 MD |
1084 | /* Allow passing parameters after device name */ |
1085 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 1086 | epdrv->requested_id = -1; |
c60e0504 MD |
1087 | else { |
1088 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
1089 | &tmp, 10); | |
1090 | ||
1091 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
1092 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
1093 | n = 0; | |
1094 | } else | |
1095 | n += strcspn(&buf[n + 1], ",") + 1; | |
1096 | } | |
1097 | ||
1098 | if (buf[n] == ',') | |
1099 | n++; | |
1100 | ||
1101 | if (epdrv->bufsize) { | |
1102 | memcpy(epdrv->buffer, &buf[n], | |
1103 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
1104 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
1105 | } | |
13977091 MD |
1106 | } |
1107 | ||
1108 | return 0; | |
1109 | } | |
1110 | ||
1111 | /** | |
4d26e139 | 1112 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
1113 | * @devs: array of early platform devices to add |
1114 | * @num: number of early platform devices in array | |
4d26e139 MD |
1115 | * |
1116 | * Used by early architecture code to register early platform devices and | |
1117 | * their platform data. | |
13977091 MD |
1118 | */ |
1119 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1120 | { | |
1121 | struct device *dev; | |
1122 | int i; | |
1123 | ||
1124 | /* simply add the devices to list */ | |
1125 | for (i = 0; i < num; i++) { | |
1126 | dev = &devs[i]->dev; | |
1127 | ||
1128 | if (!dev->devres_head.next) { | |
1129 | INIT_LIST_HEAD(&dev->devres_head); | |
1130 | list_add_tail(&dev->devres_head, | |
1131 | &early_platform_device_list); | |
1132 | } | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | /** | |
4d26e139 | 1137 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 1138 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
1139 | * |
1140 | * Used by architecture code to register all early platform drivers | |
1141 | * for a certain class. If omitted then only early platform drivers | |
1142 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
1143 | */ |
1144 | void __init early_platform_driver_register_all(char *class_str) | |
1145 | { | |
1146 | /* The "class_str" parameter may or may not be present on the kernel | |
1147 | * command line. If it is present then there may be more than one | |
1148 | * matching parameter. | |
1149 | * | |
1150 | * Since we register our early platform drivers using early_param() | |
1151 | * we need to make sure that they also get registered in the case | |
1152 | * when the parameter is missing from the kernel command line. | |
1153 | * | |
1154 | * We use parse_early_options() to make sure the early_param() gets | |
1155 | * called at least once. The early_param() may be called more than | |
1156 | * once since the name of the preferred device may be specified on | |
1157 | * the kernel command line. early_platform_driver_register() handles | |
1158 | * this case for us. | |
1159 | */ | |
1160 | parse_early_options(class_str); | |
1161 | } | |
1162 | ||
1163 | /** | |
4d26e139 | 1164 | * early_platform_match - find early platform device matching driver |
d86c1302 | 1165 | * @epdrv: early platform driver structure |
13977091 MD |
1166 | * @id: id to match against |
1167 | */ | |
1168 | static __init struct platform_device * | |
1169 | early_platform_match(struct early_platform_driver *epdrv, int id) | |
1170 | { | |
1171 | struct platform_device *pd; | |
1172 | ||
1173 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1174 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1175 | if (pd->id == id) | |
1176 | return pd; | |
1177 | ||
1178 | return NULL; | |
1179 | } | |
1180 | ||
1181 | /** | |
4d26e139 | 1182 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1183 | * @epdrv: early platform driver structure |
13977091 MD |
1184 | * @id: return true if id or above exists |
1185 | */ | |
1186 | static __init int early_platform_left(struct early_platform_driver *epdrv, | |
1187 | int id) | |
1188 | { | |
1189 | struct platform_device *pd; | |
1190 | ||
1191 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1192 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1193 | if (pd->id >= id) | |
1194 | return 1; | |
1195 | ||
1196 | return 0; | |
1197 | } | |
1198 | ||
1199 | /** | |
4d26e139 | 1200 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1201 | * @class_str: string to identify early platform driver class |
1202 | * @id: id to match against | |
1203 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1204 | */ | |
1205 | static int __init early_platform_driver_probe_id(char *class_str, | |
1206 | int id, | |
1207 | int nr_probe) | |
1208 | { | |
1209 | struct early_platform_driver *epdrv; | |
1210 | struct platform_device *match; | |
1211 | int match_id; | |
1212 | int n = 0; | |
1213 | int left = 0; | |
1214 | ||
1215 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1216 | /* only use drivers matching our class_str */ | |
1217 | if (strcmp(class_str, epdrv->class_str)) | |
1218 | continue; | |
1219 | ||
1220 | if (id == -2) { | |
1221 | match_id = epdrv->requested_id; | |
1222 | left = 1; | |
1223 | ||
1224 | } else { | |
1225 | match_id = id; | |
1226 | left += early_platform_left(epdrv, id); | |
1227 | ||
1228 | /* skip requested id */ | |
1229 | switch (epdrv->requested_id) { | |
1230 | case EARLY_PLATFORM_ID_ERROR: | |
1231 | case EARLY_PLATFORM_ID_UNSET: | |
1232 | break; | |
1233 | default: | |
1234 | if (epdrv->requested_id == id) | |
1235 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1236 | } | |
1237 | } | |
1238 | ||
1239 | switch (match_id) { | |
1240 | case EARLY_PLATFORM_ID_ERROR: | |
1241 | pr_warning("%s: unable to parse %s parameter\n", | |
1242 | class_str, epdrv->pdrv->driver.name); | |
1243 | /* fall-through */ | |
1244 | case EARLY_PLATFORM_ID_UNSET: | |
1245 | match = NULL; | |
1246 | break; | |
1247 | default: | |
1248 | match = early_platform_match(epdrv, match_id); | |
1249 | } | |
1250 | ||
1251 | if (match) { | |
a636ee7f PM |
1252 | /* |
1253 | * Set up a sensible init_name to enable | |
1254 | * dev_name() and others to be used before the | |
1255 | * rest of the driver core is initialized. | |
1256 | */ | |
06fe53be | 1257 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1258 | if (match->id != -1) |
bd05086b PM |
1259 | match->dev.init_name = |
1260 | kasprintf(GFP_KERNEL, "%s.%d", | |
1261 | match->name, | |
1262 | match->id); | |
a636ee7f | 1263 | else |
bd05086b PM |
1264 | match->dev.init_name = |
1265 | kasprintf(GFP_KERNEL, "%s", | |
1266 | match->name); | |
a636ee7f | 1267 | |
a636ee7f PM |
1268 | if (!match->dev.init_name) |
1269 | return -ENOMEM; | |
1270 | } | |
bd05086b | 1271 | |
13977091 MD |
1272 | if (epdrv->pdrv->probe(match)) |
1273 | pr_warning("%s: unable to probe %s early.\n", | |
1274 | class_str, match->name); | |
1275 | else | |
1276 | n++; | |
1277 | } | |
1278 | ||
1279 | if (n >= nr_probe) | |
1280 | break; | |
1281 | } | |
1282 | ||
1283 | if (left) | |
1284 | return n; | |
1285 | else | |
1286 | return -ENODEV; | |
1287 | } | |
1288 | ||
1289 | /** | |
4d26e139 | 1290 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1291 | * @class_str: string to identify early platform driver class |
1292 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1293 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1294 | * |
1295 | * Used by architecture code to probe registered early platform drivers | |
1296 | * within a certain class. For probe to happen a registered early platform | |
1297 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1298 | */ |
1299 | int __init early_platform_driver_probe(char *class_str, | |
1300 | int nr_probe, | |
1301 | int user_only) | |
1302 | { | |
1303 | int k, n, i; | |
1304 | ||
1305 | n = 0; | |
1306 | for (i = -2; n < nr_probe; i++) { | |
1307 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1308 | ||
1309 | if (k < 0) | |
1310 | break; | |
1311 | ||
1312 | n += k; | |
1313 | ||
1314 | if (user_only) | |
1315 | break; | |
1316 | } | |
1317 | ||
1318 | return n; | |
1319 | } | |
1320 | ||
1321 | /** | |
1322 | * early_platform_cleanup - clean up early platform code | |
1323 | */ | |
1324 | void __init early_platform_cleanup(void) | |
1325 | { | |
1326 | struct platform_device *pd, *pd2; | |
1327 | ||
1328 | /* clean up the devres list used to chain devices */ | |
1329 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1330 | dev.devres_head) { | |
1331 | list_del(&pd->dev.devres_head); | |
1332 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1333 | } | |
1334 | } | |
1335 |