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 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 | ||
3e61dfd8 | 195 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); |
37c12e74 | 196 | if (r) { |
37c12e74 RK |
197 | pdev->resource = r; |
198 | pdev->num_resources = num; | |
3e61dfd8 | 199 | return 0; |
37c12e74 | 200 | } |
3e61dfd8 | 201 | return -ENOMEM; |
37c12e74 RK |
202 | } |
203 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
204 | ||
205 | /** | |
3c31f07a | 206 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
207 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
208 | * @data: platform specific data for this platform device | |
209 | * @size: size of platform specific data | |
37c12e74 | 210 | * |
4a3ad20c GKH |
211 | * Add a copy of platform specific data to the platform device's |
212 | * platform_data pointer. The memory associated with the platform data | |
213 | * will be freed when the platform device is released. | |
37c12e74 | 214 | */ |
4a3ad20c GKH |
215 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
216 | size_t size) | |
37c12e74 | 217 | { |
daa41226 | 218 | void *d = kmemdup(data, size, GFP_KERNEL); |
37c12e74 | 219 | |
37c12e74 | 220 | if (d) { |
37c12e74 | 221 | pdev->dev.platform_data = d; |
daa41226 | 222 | return 0; |
37c12e74 | 223 | } |
daa41226 | 224 | return -ENOMEM; |
37c12e74 RK |
225 | } |
226 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
227 | ||
228 | /** | |
4a3ad20c GKH |
229 | * platform_device_add - add a platform device to device hierarchy |
230 | * @pdev: platform device we're adding | |
1da177e4 | 231 | * |
4a3ad20c GKH |
232 | * This is part 2 of platform_device_register(), though may be called |
233 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 234 | */ |
37c12e74 | 235 | int platform_device_add(struct platform_device *pdev) |
1da177e4 LT |
236 | { |
237 | int i, ret = 0; | |
238 | ||
239 | if (!pdev) | |
240 | return -EINVAL; | |
241 | ||
242 | if (!pdev->dev.parent) | |
243 | pdev->dev.parent = &platform_bus; | |
244 | ||
245 | pdev->dev.bus = &platform_bus_type; | |
246 | ||
247 | if (pdev->id != -1) | |
1e0b2cf9 | 248 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
1da177e4 | 249 | else |
acc0e90f | 250 | dev_set_name(&pdev->dev, "%s", pdev->name); |
1da177e4 LT |
251 | |
252 | for (i = 0; i < pdev->num_resources; i++) { | |
253 | struct resource *p, *r = &pdev->resource[i]; | |
254 | ||
255 | if (r->name == NULL) | |
1e0b2cf9 | 256 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
257 | |
258 | p = r->parent; | |
259 | if (!p) { | |
c9f66169 | 260 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 261 | p = &iomem_resource; |
c9f66169 | 262 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
263 | p = &ioport_resource; |
264 | } | |
265 | ||
d960bb4d | 266 | if (p && insert_resource(p, r)) { |
1da177e4 LT |
267 | printk(KERN_ERR |
268 | "%s: failed to claim resource %d\n", | |
1e0b2cf9 | 269 | dev_name(&pdev->dev), i); |
1da177e4 LT |
270 | ret = -EBUSY; |
271 | goto failed; | |
272 | } | |
273 | } | |
274 | ||
275 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 276 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 277 | |
e3915532 | 278 | ret = device_add(&pdev->dev); |
1da177e4 LT |
279 | if (ret == 0) |
280 | return ret; | |
281 | ||
282 | failed: | |
c9f66169 MD |
283 | while (--i >= 0) { |
284 | struct resource *r = &pdev->resource[i]; | |
285 | unsigned long type = resource_type(r); | |
286 | ||
287 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
288 | release_resource(r); | |
289 | } | |
290 | ||
1da177e4 LT |
291 | return ret; |
292 | } | |
37c12e74 RK |
293 | EXPORT_SYMBOL_GPL(platform_device_add); |
294 | ||
295 | /** | |
4a3ad20c GKH |
296 | * platform_device_del - remove a platform-level device |
297 | * @pdev: platform device we're removing | |
1da177e4 | 298 | * |
4a3ad20c GKH |
299 | * Note that this function will also release all memory- and port-based |
300 | * resources owned by the device (@dev->resource). This function must | |
301 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 302 | */ |
93ce3061 | 303 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
304 | { |
305 | int i; | |
306 | ||
307 | if (pdev) { | |
dc4c15d4 JD |
308 | device_del(&pdev->dev); |
309 | ||
1da177e4 LT |
310 | for (i = 0; i < pdev->num_resources; i++) { |
311 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
312 | unsigned long type = resource_type(r); |
313 | ||
314 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
315 | release_resource(r); |
316 | } | |
1da177e4 LT |
317 | } |
318 | } | |
93ce3061 DT |
319 | EXPORT_SYMBOL_GPL(platform_device_del); |
320 | ||
321 | /** | |
4a3ad20c GKH |
322 | * platform_device_register - add a platform-level device |
323 | * @pdev: platform device we're adding | |
93ce3061 | 324 | */ |
4a3ad20c | 325 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
326 | { |
327 | device_initialize(&pdev->dev); | |
328 | return platform_device_add(pdev); | |
329 | } | |
a96b2042 | 330 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
331 | |
332 | /** | |
4a3ad20c GKH |
333 | * platform_device_unregister - unregister a platform-level device |
334 | * @pdev: platform device we're unregistering | |
93ce3061 | 335 | * |
4a3ad20c GKH |
336 | * Unregistration is done in 2 steps. First we release all resources |
337 | * and remove it from the subsystem, then we drop reference count by | |
338 | * calling platform_device_put(). | |
93ce3061 | 339 | */ |
4a3ad20c | 340 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
341 | { |
342 | platform_device_del(pdev); | |
343 | platform_device_put(pdev); | |
344 | } | |
a96b2042 | 345 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 346 | |
1da177e4 | 347 | /** |
44f28bde UKK |
348 | * platform_device_register_resndata - add a platform-level device with |
349 | * resources and platform-specific data | |
49a4ec18 | 350 | * |
d8bf2540 DB |
351 | * @parent: parent device for the device we're adding |
352 | * @name: base name of the device we're adding | |
353 | * @id: instance id | |
44f28bde UKK |
354 | * @res: set of resources that needs to be allocated for the device |
355 | * @num: number of resources | |
d8bf2540 DB |
356 | * @data: platform specific data for this platform device |
357 | * @size: size of platform specific data | |
358 | * | |
f0eae0ed | 359 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 360 | */ |
737a3bb9 | 361 | struct platform_device *__init_or_module platform_device_register_resndata( |
d8bf2540 DB |
362 | struct device *parent, |
363 | const char *name, int id, | |
44f28bde | 364 | const struct resource *res, unsigned int num, |
d8bf2540 DB |
365 | const void *data, size_t size) |
366 | { | |
44f28bde | 367 | int ret = -ENOMEM; |
d8bf2540 | 368 | struct platform_device *pdev; |
d8bf2540 DB |
369 | |
370 | pdev = platform_device_alloc(name, id); | |
44f28bde UKK |
371 | if (!pdev) |
372 | goto err; | |
d8bf2540 DB |
373 | |
374 | pdev->dev.parent = parent; | |
375 | ||
44f28bde UKK |
376 | if (res) { |
377 | ret = platform_device_add_resources(pdev, res, num); | |
378 | if (ret) | |
379 | goto err; | |
380 | } | |
381 | ||
382 | if (data) { | |
383 | ret = platform_device_add_data(pdev, data, size); | |
384 | if (ret) | |
385 | goto err; | |
d8bf2540 DB |
386 | } |
387 | ||
44f28bde UKK |
388 | ret = platform_device_add(pdev); |
389 | if (ret) { | |
390 | err: | |
391 | platform_device_put(pdev); | |
392 | return ERR_PTR(ret); | |
393 | } | |
d8bf2540 DB |
394 | |
395 | return pdev; | |
d8bf2540 | 396 | } |
44f28bde | 397 | EXPORT_SYMBOL_GPL(platform_device_register_resndata); |
d8bf2540 | 398 | |
00d3dcdd RK |
399 | static int platform_drv_probe(struct device *_dev) |
400 | { | |
401 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
402 | struct platform_device *dev = to_platform_device(_dev); | |
403 | ||
404 | return drv->probe(dev); | |
405 | } | |
406 | ||
c67334fb DB |
407 | static int platform_drv_probe_fail(struct device *_dev) |
408 | { | |
409 | return -ENXIO; | |
410 | } | |
411 | ||
00d3dcdd RK |
412 | static int platform_drv_remove(struct device *_dev) |
413 | { | |
414 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
415 | struct platform_device *dev = to_platform_device(_dev); | |
416 | ||
417 | return drv->remove(dev); | |
418 | } | |
419 | ||
420 | static void platform_drv_shutdown(struct device *_dev) | |
421 | { | |
422 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
423 | struct platform_device *dev = to_platform_device(_dev); | |
424 | ||
425 | drv->shutdown(dev); | |
426 | } | |
427 | ||
00d3dcdd | 428 | /** |
3c31f07a | 429 | * platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 430 | * @drv: platform driver structure |
00d3dcdd RK |
431 | */ |
432 | int platform_driver_register(struct platform_driver *drv) | |
433 | { | |
434 | drv->driver.bus = &platform_bus_type; | |
435 | if (drv->probe) | |
436 | drv->driver.probe = platform_drv_probe; | |
437 | if (drv->remove) | |
438 | drv->driver.remove = platform_drv_remove; | |
439 | if (drv->shutdown) | |
440 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 441 | |
00d3dcdd RK |
442 | return driver_register(&drv->driver); |
443 | } | |
444 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
445 | ||
446 | /** | |
3c31f07a | 447 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 448 | * @drv: platform driver structure |
00d3dcdd RK |
449 | */ |
450 | void platform_driver_unregister(struct platform_driver *drv) | |
451 | { | |
452 | driver_unregister(&drv->driver); | |
453 | } | |
454 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
455 | ||
c67334fb DB |
456 | /** |
457 | * platform_driver_probe - register driver for non-hotpluggable device | |
458 | * @drv: platform driver structure | |
459 | * @probe: the driver probe routine, probably from an __init section | |
460 | * | |
461 | * Use this instead of platform_driver_register() when you know the device | |
462 | * is not hotpluggable and has already been registered, and you want to | |
463 | * remove its run-once probe() infrastructure from memory after the driver | |
464 | * has bound to the device. | |
465 | * | |
466 | * One typical use for this would be with drivers for controllers integrated | |
467 | * into system-on-chip processors, where the controller devices have been | |
468 | * configured as part of board setup. | |
469 | * | |
470 | * Returns zero if the driver registered and bound to a device, else returns | |
471 | * a negative error code and with the driver not registered. | |
472 | */ | |
c63e0783 | 473 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
474 | int (*probe)(struct platform_device *)) |
475 | { | |
476 | int retval, code; | |
477 | ||
1a6f2a75 DT |
478 | /* make sure driver won't have bind/unbind attributes */ |
479 | drv->driver.suppress_bind_attrs = true; | |
480 | ||
c67334fb DB |
481 | /* temporary section violation during probe() */ |
482 | drv->probe = probe; | |
483 | retval = code = platform_driver_register(drv); | |
484 | ||
1a6f2a75 DT |
485 | /* |
486 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
487 | * the list of drivers in order to probe new devices. Check to see |
488 | * if the probe was successful, and make sure any forced probes of | |
489 | * new devices fail. | |
490 | */ | |
c6f7e72a | 491 | spin_lock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb | 492 | drv->probe = NULL; |
e5dd1278 | 493 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
494 | retval = -ENODEV; |
495 | drv->driver.probe = platform_drv_probe_fail; | |
c6f7e72a | 496 | spin_unlock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb DB |
497 | |
498 | if (code != retval) | |
499 | platform_driver_unregister(drv); | |
500 | return retval; | |
501 | } | |
502 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 503 | |
ecdf6ceb DT |
504 | /** |
505 | * platform_create_bundle - register driver and create corresponding device | |
506 | * @driver: platform driver structure | |
507 | * @probe: the driver probe routine, probably from an __init section | |
508 | * @res: set of resources that needs to be allocated for the device | |
509 | * @n_res: number of resources | |
510 | * @data: platform specific data for this platform device | |
511 | * @size: size of platform specific data | |
512 | * | |
513 | * Use this in legacy-style modules that probe hardware directly and | |
514 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
515 | * |
516 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb DT |
517 | */ |
518 | struct platform_device * __init_or_module platform_create_bundle( | |
519 | struct platform_driver *driver, | |
520 | int (*probe)(struct platform_device *), | |
521 | struct resource *res, unsigned int n_res, | |
522 | const void *data, size_t size) | |
523 | { | |
524 | struct platform_device *pdev; | |
525 | int error; | |
526 | ||
527 | pdev = platform_device_alloc(driver->driver.name, -1); | |
528 | if (!pdev) { | |
529 | error = -ENOMEM; | |
530 | goto err_out; | |
531 | } | |
532 | ||
533 | if (res) { | |
534 | error = platform_device_add_resources(pdev, res, n_res); | |
535 | if (error) | |
536 | goto err_pdev_put; | |
537 | } | |
538 | ||
539 | if (data) { | |
540 | error = platform_device_add_data(pdev, data, size); | |
541 | if (error) | |
542 | goto err_pdev_put; | |
543 | } | |
544 | ||
545 | error = platform_device_add(pdev); | |
546 | if (error) | |
547 | goto err_pdev_put; | |
548 | ||
549 | error = platform_driver_probe(driver, probe); | |
550 | if (error) | |
551 | goto err_pdev_del; | |
552 | ||
553 | return pdev; | |
554 | ||
555 | err_pdev_del: | |
556 | platform_device_del(pdev); | |
557 | err_pdev_put: | |
558 | platform_device_put(pdev); | |
559 | err_out: | |
560 | return ERR_PTR(error); | |
561 | } | |
562 | EXPORT_SYMBOL_GPL(platform_create_bundle); | |
563 | ||
a0245f7a DB |
564 | /* modalias support enables more hands-off userspace setup: |
565 | * (a) environment variable lets new-style hotplug events work once system is | |
566 | * fully running: "modprobe $MODALIAS" | |
567 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
568 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
569 | */ | |
4a3ad20c GKH |
570 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
571 | char *buf) | |
a0245f7a DB |
572 | { |
573 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 574 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
575 | |
576 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
577 | } | |
578 | ||
579 | static struct device_attribute platform_dev_attrs[] = { | |
580 | __ATTR_RO(modalias), | |
581 | __ATTR_NULL, | |
582 | }; | |
583 | ||
7eff2e7a | 584 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
585 | { |
586 | struct platform_device *pdev = to_platform_device(dev); | |
eca39301 GL |
587 | int rc; |
588 | ||
589 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
590 | rc = of_device_uevent(dev,env); | |
591 | if (rc != -ENODEV) | |
592 | return rc; | |
a0245f7a | 593 | |
57fee4a5 EM |
594 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
595 | (pdev->id_entry) ? pdev->id_entry->name : pdev->name); | |
a0245f7a DB |
596 | return 0; |
597 | } | |
598 | ||
57fee4a5 | 599 | static const struct platform_device_id *platform_match_id( |
831fad2f | 600 | const struct platform_device_id *id, |
57fee4a5 EM |
601 | struct platform_device *pdev) |
602 | { | |
603 | while (id->name[0]) { | |
604 | if (strcmp(pdev->name, id->name) == 0) { | |
605 | pdev->id_entry = id; | |
606 | return id; | |
607 | } | |
608 | id++; | |
609 | } | |
610 | return NULL; | |
611 | } | |
612 | ||
1da177e4 | 613 | /** |
4a3ad20c GKH |
614 | * platform_match - bind platform device to platform driver. |
615 | * @dev: device. | |
616 | * @drv: driver. | |
1da177e4 | 617 | * |
4a3ad20c GKH |
618 | * Platform device IDs are assumed to be encoded like this: |
619 | * "<name><instance>", where <name> is a short description of the type of | |
620 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
621 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
622 | * "<name>". So, extract the <name> from the platform_device structure, | |
623 | * and compare it against the name of the driver. Return whether they match | |
624 | * or not. | |
1da177e4 | 625 | */ |
4a3ad20c | 626 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 627 | { |
71b3e0c1 | 628 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
629 | struct platform_driver *pdrv = to_platform_driver(drv); |
630 | ||
05212157 GL |
631 | /* Attempt an OF style match first */ |
632 | if (of_driver_match_device(dev, drv)) | |
633 | return 1; | |
634 | ||
635 | /* Then try to match against the id table */ | |
57fee4a5 EM |
636 | if (pdrv->id_table) |
637 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 638 | |
57fee4a5 | 639 | /* fall-back to driver name match */ |
1e0b2cf9 | 640 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
641 | } |
642 | ||
25e18499 RW |
643 | #ifdef CONFIG_PM_SLEEP |
644 | ||
645 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 646 | { |
783ea7d4 MD |
647 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
648 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
649 | int ret = 0; |
650 | ||
783ea7d4 MD |
651 | if (dev->driver && pdrv->suspend) |
652 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
653 | |
654 | return ret; | |
655 | } | |
656 | ||
25e18499 | 657 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 658 | { |
783ea7d4 MD |
659 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
660 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
661 | int ret = 0; |
662 | ||
783ea7d4 MD |
663 | if (dev->driver && pdrv->resume) |
664 | ret = pdrv->resume(pdev); | |
9480e307 | 665 | |
1da177e4 LT |
666 | return ret; |
667 | } | |
668 | ||
25e18499 RW |
669 | static int platform_pm_prepare(struct device *dev) |
670 | { | |
671 | struct device_driver *drv = dev->driver; | |
672 | int ret = 0; | |
673 | ||
674 | if (drv && drv->pm && drv->pm->prepare) | |
675 | ret = drv->pm->prepare(dev); | |
676 | ||
677 | return ret; | |
678 | } | |
679 | ||
680 | static void platform_pm_complete(struct device *dev) | |
681 | { | |
682 | struct device_driver *drv = dev->driver; | |
683 | ||
684 | if (drv && drv->pm && drv->pm->complete) | |
685 | drv->pm->complete(dev); | |
686 | } | |
687 | ||
9d730229 MD |
688 | #else /* !CONFIG_PM_SLEEP */ |
689 | ||
690 | #define platform_pm_prepare NULL | |
691 | #define platform_pm_complete NULL | |
692 | ||
693 | #endif /* !CONFIG_PM_SLEEP */ | |
694 | ||
25e18499 RW |
695 | #ifdef CONFIG_SUSPEND |
696 | ||
190e8370 | 697 | int __weak platform_pm_suspend(struct device *dev) |
25e18499 RW |
698 | { |
699 | struct device_driver *drv = dev->driver; | |
700 | int ret = 0; | |
701 | ||
adf09493 RW |
702 | if (!drv) |
703 | return 0; | |
704 | ||
705 | if (drv->pm) { | |
25e18499 RW |
706 | if (drv->pm->suspend) |
707 | ret = drv->pm->suspend(dev); | |
708 | } else { | |
709 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
710 | } | |
711 | ||
712 | return ret; | |
713 | } | |
714 | ||
190e8370 | 715 | int __weak platform_pm_suspend_noirq(struct device *dev) |
25e18499 | 716 | { |
adf09493 | 717 | struct device_driver *drv = dev->driver; |
25e18499 RW |
718 | int ret = 0; |
719 | ||
adf09493 | 720 | if (!drv) |
25e18499 RW |
721 | return 0; |
722 | ||
adf09493 RW |
723 | if (drv->pm) { |
724 | if (drv->pm->suspend_noirq) | |
725 | ret = drv->pm->suspend_noirq(dev); | |
25e18499 RW |
726 | } |
727 | ||
728 | return ret; | |
729 | } | |
730 | ||
190e8370 | 731 | int __weak platform_pm_resume(struct device *dev) |
25e18499 RW |
732 | { |
733 | struct device_driver *drv = dev->driver; | |
734 | int ret = 0; | |
735 | ||
adf09493 RW |
736 | if (!drv) |
737 | return 0; | |
738 | ||
739 | if (drv->pm) { | |
25e18499 RW |
740 | if (drv->pm->resume) |
741 | ret = drv->pm->resume(dev); | |
742 | } else { | |
743 | ret = platform_legacy_resume(dev); | |
744 | } | |
745 | ||
746 | return ret; | |
747 | } | |
748 | ||
190e8370 | 749 | int __weak platform_pm_resume_noirq(struct device *dev) |
25e18499 | 750 | { |
adf09493 | 751 | struct device_driver *drv = dev->driver; |
25e18499 RW |
752 | int ret = 0; |
753 | ||
adf09493 | 754 | if (!drv) |
25e18499 RW |
755 | return 0; |
756 | ||
adf09493 RW |
757 | if (drv->pm) { |
758 | if (drv->pm->resume_noirq) | |
759 | ret = drv->pm->resume_noirq(dev); | |
25e18499 RW |
760 | } |
761 | ||
762 | return ret; | |
763 | } | |
764 | ||
765 | #else /* !CONFIG_SUSPEND */ | |
766 | ||
767 | #define platform_pm_suspend NULL | |
768 | #define platform_pm_resume NULL | |
769 | #define platform_pm_suspend_noirq NULL | |
770 | #define platform_pm_resume_noirq NULL | |
771 | ||
772 | #endif /* !CONFIG_SUSPEND */ | |
773 | ||
774 | #ifdef CONFIG_HIBERNATION | |
775 | ||
776 | static int platform_pm_freeze(struct device *dev) | |
777 | { | |
778 | struct device_driver *drv = dev->driver; | |
779 | int ret = 0; | |
780 | ||
781 | if (!drv) | |
782 | return 0; | |
783 | ||
784 | if (drv->pm) { | |
785 | if (drv->pm->freeze) | |
786 | ret = drv->pm->freeze(dev); | |
787 | } else { | |
788 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
789 | } | |
790 | ||
791 | return ret; | |
792 | } | |
793 | ||
794 | static int platform_pm_freeze_noirq(struct device *dev) | |
795 | { | |
adf09493 | 796 | struct device_driver *drv = dev->driver; |
25e18499 RW |
797 | int ret = 0; |
798 | ||
adf09493 | 799 | if (!drv) |
25e18499 RW |
800 | return 0; |
801 | ||
adf09493 RW |
802 | if (drv->pm) { |
803 | if (drv->pm->freeze_noirq) | |
804 | ret = drv->pm->freeze_noirq(dev); | |
25e18499 RW |
805 | } |
806 | ||
807 | return ret; | |
808 | } | |
809 | ||
810 | static int platform_pm_thaw(struct device *dev) | |
811 | { | |
812 | struct device_driver *drv = dev->driver; | |
813 | int ret = 0; | |
814 | ||
adf09493 RW |
815 | if (!drv) |
816 | return 0; | |
817 | ||
818 | if (drv->pm) { | |
25e18499 RW |
819 | if (drv->pm->thaw) |
820 | ret = drv->pm->thaw(dev); | |
821 | } else { | |
822 | ret = platform_legacy_resume(dev); | |
823 | } | |
824 | ||
825 | return ret; | |
826 | } | |
827 | ||
828 | static int platform_pm_thaw_noirq(struct device *dev) | |
829 | { | |
adf09493 | 830 | struct device_driver *drv = dev->driver; |
25e18499 RW |
831 | int ret = 0; |
832 | ||
adf09493 | 833 | if (!drv) |
25e18499 RW |
834 | return 0; |
835 | ||
adf09493 RW |
836 | if (drv->pm) { |
837 | if (drv->pm->thaw_noirq) | |
838 | ret = drv->pm->thaw_noirq(dev); | |
25e18499 RW |
839 | } |
840 | ||
841 | return ret; | |
842 | } | |
843 | ||
844 | static int platform_pm_poweroff(struct device *dev) | |
845 | { | |
846 | struct device_driver *drv = dev->driver; | |
847 | int ret = 0; | |
848 | ||
adf09493 RW |
849 | if (!drv) |
850 | return 0; | |
851 | ||
852 | if (drv->pm) { | |
25e18499 RW |
853 | if (drv->pm->poweroff) |
854 | ret = drv->pm->poweroff(dev); | |
855 | } else { | |
856 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
857 | } | |
858 | ||
859 | return ret; | |
860 | } | |
861 | ||
862 | static int platform_pm_poweroff_noirq(struct device *dev) | |
863 | { | |
adf09493 | 864 | struct device_driver *drv = dev->driver; |
25e18499 RW |
865 | int ret = 0; |
866 | ||
adf09493 | 867 | if (!drv) |
25e18499 RW |
868 | return 0; |
869 | ||
adf09493 RW |
870 | if (drv->pm) { |
871 | if (drv->pm->poweroff_noirq) | |
872 | ret = drv->pm->poweroff_noirq(dev); | |
25e18499 RW |
873 | } |
874 | ||
875 | return ret; | |
876 | } | |
877 | ||
878 | static int platform_pm_restore(struct device *dev) | |
879 | { | |
880 | struct device_driver *drv = dev->driver; | |
881 | int ret = 0; | |
882 | ||
adf09493 RW |
883 | if (!drv) |
884 | return 0; | |
885 | ||
886 | if (drv->pm) { | |
25e18499 RW |
887 | if (drv->pm->restore) |
888 | ret = drv->pm->restore(dev); | |
889 | } else { | |
890 | ret = platform_legacy_resume(dev); | |
891 | } | |
892 | ||
893 | return ret; | |
894 | } | |
895 | ||
896 | static int platform_pm_restore_noirq(struct device *dev) | |
897 | { | |
adf09493 | 898 | struct device_driver *drv = dev->driver; |
25e18499 RW |
899 | int ret = 0; |
900 | ||
adf09493 | 901 | if (!drv) |
25e18499 RW |
902 | return 0; |
903 | ||
adf09493 RW |
904 | if (drv->pm) { |
905 | if (drv->pm->restore_noirq) | |
906 | ret = drv->pm->restore_noirq(dev); | |
25e18499 RW |
907 | } |
908 | ||
909 | return ret; | |
910 | } | |
911 | ||
912 | #else /* !CONFIG_HIBERNATION */ | |
913 | ||
914 | #define platform_pm_freeze NULL | |
915 | #define platform_pm_thaw NULL | |
916 | #define platform_pm_poweroff NULL | |
917 | #define platform_pm_restore NULL | |
918 | #define platform_pm_freeze_noirq NULL | |
919 | #define platform_pm_thaw_noirq NULL | |
920 | #define platform_pm_poweroff_noirq NULL | |
921 | #define platform_pm_restore_noirq NULL | |
922 | ||
923 | #endif /* !CONFIG_HIBERNATION */ | |
924 | ||
9d730229 MD |
925 | #ifdef CONFIG_PM_RUNTIME |
926 | ||
927 | int __weak platform_pm_runtime_suspend(struct device *dev) | |
928 | { | |
543f2503 | 929 | return pm_generic_runtime_suspend(dev); |
9d730229 MD |
930 | }; |
931 | ||
932 | int __weak platform_pm_runtime_resume(struct device *dev) | |
933 | { | |
543f2503 | 934 | return pm_generic_runtime_resume(dev); |
9d730229 MD |
935 | }; |
936 | ||
937 | int __weak platform_pm_runtime_idle(struct device *dev) | |
938 | { | |
543f2503 | 939 | return pm_generic_runtime_idle(dev); |
9d730229 MD |
940 | }; |
941 | ||
942 | #else /* !CONFIG_PM_RUNTIME */ | |
943 | ||
944 | #define platform_pm_runtime_suspend NULL | |
945 | #define platform_pm_runtime_resume NULL | |
946 | #define platform_pm_runtime_idle NULL | |
947 | ||
948 | #endif /* !CONFIG_PM_RUNTIME */ | |
949 | ||
d9ab7716 | 950 | static const struct dev_pm_ops platform_dev_pm_ops = { |
adf09493 RW |
951 | .prepare = platform_pm_prepare, |
952 | .complete = platform_pm_complete, | |
953 | .suspend = platform_pm_suspend, | |
954 | .resume = platform_pm_resume, | |
955 | .freeze = platform_pm_freeze, | |
956 | .thaw = platform_pm_thaw, | |
957 | .poweroff = platform_pm_poweroff, | |
958 | .restore = platform_pm_restore, | |
25e18499 RW |
959 | .suspend_noirq = platform_pm_suspend_noirq, |
960 | .resume_noirq = platform_pm_resume_noirq, | |
961 | .freeze_noirq = platform_pm_freeze_noirq, | |
962 | .thaw_noirq = platform_pm_thaw_noirq, | |
963 | .poweroff_noirq = platform_pm_poweroff_noirq, | |
964 | .restore_noirq = platform_pm_restore_noirq, | |
9d730229 MD |
965 | .runtime_suspend = platform_pm_runtime_suspend, |
966 | .runtime_resume = platform_pm_runtime_resume, | |
967 | .runtime_idle = platform_pm_runtime_idle, | |
25e18499 RW |
968 | }; |
969 | ||
1da177e4 LT |
970 | struct bus_type platform_bus_type = { |
971 | .name = "platform", | |
a0245f7a | 972 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 973 | .match = platform_match, |
a0245f7a | 974 | .uevent = platform_uevent, |
9d730229 | 975 | .pm = &platform_dev_pm_ops, |
1da177e4 | 976 | }; |
a96b2042 | 977 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
978 | |
979 | int __init platform_bus_init(void) | |
980 | { | |
fbfb1445 CH |
981 | int error; |
982 | ||
13977091 MD |
983 | early_platform_cleanup(); |
984 | ||
fbfb1445 CH |
985 | error = device_register(&platform_bus); |
986 | if (error) | |
987 | return error; | |
988 | error = bus_register(&platform_bus_type); | |
989 | if (error) | |
990 | device_unregister(&platform_bus); | |
991 | return error; | |
1da177e4 LT |
992 | } |
993 | ||
994 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
995 | u64 dma_get_required_mask(struct device *dev) | |
996 | { | |
997 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
998 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
999 | u64 mask; | |
1000 | ||
1001 | if (!high_totalram) { | |
1002 | /* convert to mask just covering totalram */ | |
1003 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
1004 | low_totalram += low_totalram - 1; | |
1005 | mask = low_totalram; | |
1006 | } else { | |
1007 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
1008 | high_totalram += high_totalram - 1; | |
1009 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
1010 | } | |
e88a0c2c | 1011 | return mask; |
1da177e4 LT |
1012 | } |
1013 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
1014 | #endif | |
13977091 MD |
1015 | |
1016 | static __initdata LIST_HEAD(early_platform_driver_list); | |
1017 | static __initdata LIST_HEAD(early_platform_device_list); | |
1018 | ||
1019 | /** | |
4d26e139 | 1020 | * early_platform_driver_register - register early platform driver |
d86c1302 | 1021 | * @epdrv: early_platform driver structure |
13977091 | 1022 | * @buf: string passed from early_param() |
4d26e139 MD |
1023 | * |
1024 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
1025 | */ |
1026 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
1027 | char *buf) | |
1028 | { | |
c60e0504 | 1029 | char *tmp; |
13977091 MD |
1030 | int n; |
1031 | ||
1032 | /* Simply add the driver to the end of the global list. | |
1033 | * Drivers will by default be put on the list in compiled-in order. | |
1034 | */ | |
1035 | if (!epdrv->list.next) { | |
1036 | INIT_LIST_HEAD(&epdrv->list); | |
1037 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
1038 | } | |
1039 | ||
1040 | /* If the user has specified device then make sure the driver | |
1041 | * gets prioritized. The driver of the last device specified on | |
1042 | * command line will be put first on the list. | |
1043 | */ | |
1044 | n = strlen(epdrv->pdrv->driver.name); | |
1045 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
1046 | list_move(&epdrv->list, &early_platform_driver_list); | |
1047 | ||
c60e0504 MD |
1048 | /* Allow passing parameters after device name */ |
1049 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 1050 | epdrv->requested_id = -1; |
c60e0504 MD |
1051 | else { |
1052 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
1053 | &tmp, 10); | |
1054 | ||
1055 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
1056 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
1057 | n = 0; | |
1058 | } else | |
1059 | n += strcspn(&buf[n + 1], ",") + 1; | |
1060 | } | |
1061 | ||
1062 | if (buf[n] == ',') | |
1063 | n++; | |
1064 | ||
1065 | if (epdrv->bufsize) { | |
1066 | memcpy(epdrv->buffer, &buf[n], | |
1067 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
1068 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
1069 | } | |
13977091 MD |
1070 | } |
1071 | ||
1072 | return 0; | |
1073 | } | |
1074 | ||
1075 | /** | |
4d26e139 | 1076 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
1077 | * @devs: array of early platform devices to add |
1078 | * @num: number of early platform devices in array | |
4d26e139 MD |
1079 | * |
1080 | * Used by early architecture code to register early platform devices and | |
1081 | * their platform data. | |
13977091 MD |
1082 | */ |
1083 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1084 | { | |
1085 | struct device *dev; | |
1086 | int i; | |
1087 | ||
1088 | /* simply add the devices to list */ | |
1089 | for (i = 0; i < num; i++) { | |
1090 | dev = &devs[i]->dev; | |
1091 | ||
1092 | if (!dev->devres_head.next) { | |
1093 | INIT_LIST_HEAD(&dev->devres_head); | |
1094 | list_add_tail(&dev->devres_head, | |
1095 | &early_platform_device_list); | |
1096 | } | |
1097 | } | |
1098 | } | |
1099 | ||
1100 | /** | |
4d26e139 | 1101 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 1102 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
1103 | * |
1104 | * Used by architecture code to register all early platform drivers | |
1105 | * for a certain class. If omitted then only early platform drivers | |
1106 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
1107 | */ |
1108 | void __init early_platform_driver_register_all(char *class_str) | |
1109 | { | |
1110 | /* The "class_str" parameter may or may not be present on the kernel | |
1111 | * command line. If it is present then there may be more than one | |
1112 | * matching parameter. | |
1113 | * | |
1114 | * Since we register our early platform drivers using early_param() | |
1115 | * we need to make sure that they also get registered in the case | |
1116 | * when the parameter is missing from the kernel command line. | |
1117 | * | |
1118 | * We use parse_early_options() to make sure the early_param() gets | |
1119 | * called at least once. The early_param() may be called more than | |
1120 | * once since the name of the preferred device may be specified on | |
1121 | * the kernel command line. early_platform_driver_register() handles | |
1122 | * this case for us. | |
1123 | */ | |
1124 | parse_early_options(class_str); | |
1125 | } | |
1126 | ||
1127 | /** | |
4d26e139 | 1128 | * early_platform_match - find early platform device matching driver |
d86c1302 | 1129 | * @epdrv: early platform driver structure |
13977091 MD |
1130 | * @id: id to match against |
1131 | */ | |
1132 | static __init struct platform_device * | |
1133 | early_platform_match(struct early_platform_driver *epdrv, int id) | |
1134 | { | |
1135 | struct platform_device *pd; | |
1136 | ||
1137 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1138 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1139 | if (pd->id == id) | |
1140 | return pd; | |
1141 | ||
1142 | return NULL; | |
1143 | } | |
1144 | ||
1145 | /** | |
4d26e139 | 1146 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1147 | * @epdrv: early platform driver structure |
13977091 MD |
1148 | * @id: return true if id or above exists |
1149 | */ | |
1150 | static __init int early_platform_left(struct early_platform_driver *epdrv, | |
1151 | int id) | |
1152 | { | |
1153 | struct platform_device *pd; | |
1154 | ||
1155 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1156 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1157 | if (pd->id >= id) | |
1158 | return 1; | |
1159 | ||
1160 | return 0; | |
1161 | } | |
1162 | ||
1163 | /** | |
4d26e139 | 1164 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1165 | * @class_str: string to identify early platform driver class |
1166 | * @id: id to match against | |
1167 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1168 | */ | |
1169 | static int __init early_platform_driver_probe_id(char *class_str, | |
1170 | int id, | |
1171 | int nr_probe) | |
1172 | { | |
1173 | struct early_platform_driver *epdrv; | |
1174 | struct platform_device *match; | |
1175 | int match_id; | |
1176 | int n = 0; | |
1177 | int left = 0; | |
1178 | ||
1179 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1180 | /* only use drivers matching our class_str */ | |
1181 | if (strcmp(class_str, epdrv->class_str)) | |
1182 | continue; | |
1183 | ||
1184 | if (id == -2) { | |
1185 | match_id = epdrv->requested_id; | |
1186 | left = 1; | |
1187 | ||
1188 | } else { | |
1189 | match_id = id; | |
1190 | left += early_platform_left(epdrv, id); | |
1191 | ||
1192 | /* skip requested id */ | |
1193 | switch (epdrv->requested_id) { | |
1194 | case EARLY_PLATFORM_ID_ERROR: | |
1195 | case EARLY_PLATFORM_ID_UNSET: | |
1196 | break; | |
1197 | default: | |
1198 | if (epdrv->requested_id == id) | |
1199 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1200 | } | |
1201 | } | |
1202 | ||
1203 | switch (match_id) { | |
1204 | case EARLY_PLATFORM_ID_ERROR: | |
1205 | pr_warning("%s: unable to parse %s parameter\n", | |
1206 | class_str, epdrv->pdrv->driver.name); | |
1207 | /* fall-through */ | |
1208 | case EARLY_PLATFORM_ID_UNSET: | |
1209 | match = NULL; | |
1210 | break; | |
1211 | default: | |
1212 | match = early_platform_match(epdrv, match_id); | |
1213 | } | |
1214 | ||
1215 | if (match) { | |
a636ee7f PM |
1216 | /* |
1217 | * Set up a sensible init_name to enable | |
1218 | * dev_name() and others to be used before the | |
1219 | * rest of the driver core is initialized. | |
1220 | */ | |
06fe53be | 1221 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1222 | if (match->id != -1) |
bd05086b PM |
1223 | match->dev.init_name = |
1224 | kasprintf(GFP_KERNEL, "%s.%d", | |
1225 | match->name, | |
1226 | match->id); | |
a636ee7f | 1227 | else |
bd05086b PM |
1228 | match->dev.init_name = |
1229 | kasprintf(GFP_KERNEL, "%s", | |
1230 | match->name); | |
a636ee7f | 1231 | |
a636ee7f PM |
1232 | if (!match->dev.init_name) |
1233 | return -ENOMEM; | |
1234 | } | |
bd05086b | 1235 | |
13977091 MD |
1236 | if (epdrv->pdrv->probe(match)) |
1237 | pr_warning("%s: unable to probe %s early.\n", | |
1238 | class_str, match->name); | |
1239 | else | |
1240 | n++; | |
1241 | } | |
1242 | ||
1243 | if (n >= nr_probe) | |
1244 | break; | |
1245 | } | |
1246 | ||
1247 | if (left) | |
1248 | return n; | |
1249 | else | |
1250 | return -ENODEV; | |
1251 | } | |
1252 | ||
1253 | /** | |
4d26e139 | 1254 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1255 | * @class_str: string to identify early platform driver class |
1256 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1257 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1258 | * |
1259 | * Used by architecture code to probe registered early platform drivers | |
1260 | * within a certain class. For probe to happen a registered early platform | |
1261 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1262 | */ |
1263 | int __init early_platform_driver_probe(char *class_str, | |
1264 | int nr_probe, | |
1265 | int user_only) | |
1266 | { | |
1267 | int k, n, i; | |
1268 | ||
1269 | n = 0; | |
1270 | for (i = -2; n < nr_probe; i++) { | |
1271 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1272 | ||
1273 | if (k < 0) | |
1274 | break; | |
1275 | ||
1276 | n += k; | |
1277 | ||
1278 | if (user_only) | |
1279 | break; | |
1280 | } | |
1281 | ||
1282 | return n; | |
1283 | } | |
1284 | ||
1285 | /** | |
1286 | * early_platform_cleanup - clean up early platform code | |
1287 | */ | |
1288 | void __init early_platform_cleanup(void) | |
1289 | { | |
1290 | struct platform_device *pd, *pd2; | |
1291 | ||
1292 | /* clean up the devres list used to chain devices */ | |
1293 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1294 | dev.devres_head) { | |
1295 | list_del(&pd->dev.devres_head); | |
1296 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1297 | } | |
1298 | } | |
1299 |