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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * platform.c - platform 'pseudo' bus for legacy devices | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * Please see Documentation/driver-model/platform.txt for more | |
10 | * information. | |
11 | */ | |
12 | ||
daa41226 | 13 | #include <linux/string.h> |
d052d1be | 14 | #include <linux/platform_device.h> |
1da177e4 LT |
15 | #include <linux/module.h> |
16 | #include <linux/init.h> | |
17 | #include <linux/dma-mapping.h> | |
18 | #include <linux/bootmem.h> | |
19 | #include <linux/err.h> | |
4e57b681 | 20 | #include <linux/slab.h> |
9d730229 | 21 | #include <linux/pm_runtime.h> |
1da177e4 | 22 | |
a1bdc7aa BD |
23 | #include "base.h" |
24 | ||
4a3ad20c GKH |
25 | #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \ |
26 | driver)) | |
00d3dcdd | 27 | |
1da177e4 | 28 | struct device platform_bus = { |
1e0b2cf9 | 29 | .init_name = "platform", |
1da177e4 | 30 | }; |
a96b2042 | 31 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 LT |
32 | |
33 | /** | |
4a3ad20c GKH |
34 | * platform_get_resource - get a resource for a device |
35 | * @dev: platform device | |
36 | * @type: resource type | |
37 | * @num: resource index | |
1da177e4 | 38 | */ |
4a3ad20c GKH |
39 | struct resource *platform_get_resource(struct platform_device *dev, |
40 | unsigned int type, unsigned int num) | |
1da177e4 LT |
41 | { |
42 | int i; | |
43 | ||
44 | for (i = 0; i < dev->num_resources; i++) { | |
45 | struct resource *r = &dev->resource[i]; | |
46 | ||
c9f66169 MD |
47 | if (type == resource_type(r) && num-- == 0) |
48 | return r; | |
1da177e4 LT |
49 | } |
50 | return NULL; | |
51 | } | |
a96b2042 | 52 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
53 | |
54 | /** | |
4a3ad20c GKH |
55 | * platform_get_irq - get an IRQ for a device |
56 | * @dev: platform device | |
57 | * @num: IRQ number index | |
1da177e4 LT |
58 | */ |
59 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
60 | { | |
61 | struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
62 | ||
305b3228 | 63 | return r ? r->start : -ENXIO; |
1da177e4 | 64 | } |
a96b2042 | 65 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
66 | |
67 | /** | |
4a3ad20c GKH |
68 | * platform_get_resource_byname - get a resource for a device by name |
69 | * @dev: platform device | |
70 | * @type: resource type | |
71 | * @name: resource name | |
1da177e4 | 72 | */ |
4a3ad20c | 73 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
74 | unsigned int type, |
75 | const char *name) | |
1da177e4 LT |
76 | { |
77 | int i; | |
78 | ||
79 | for (i = 0; i < dev->num_resources; i++) { | |
80 | struct resource *r = &dev->resource[i]; | |
81 | ||
c9f66169 MD |
82 | if (type == resource_type(r) && !strcmp(r->name, name)) |
83 | return r; | |
1da177e4 LT |
84 | } |
85 | return NULL; | |
86 | } | |
a96b2042 | 87 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
88 | |
89 | /** | |
4a3ad20c GKH |
90 | * platform_get_irq - get an IRQ for a device |
91 | * @dev: platform device | |
92 | * @name: IRQ name | |
1da177e4 | 93 | */ |
c0afe7ba | 94 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
1da177e4 | 95 | { |
4a3ad20c GKH |
96 | struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, |
97 | name); | |
1da177e4 | 98 | |
305b3228 | 99 | return r ? r->start : -ENXIO; |
1da177e4 | 100 | } |
a96b2042 | 101 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
102 | |
103 | /** | |
4a3ad20c GKH |
104 | * platform_add_devices - add a numbers of platform devices |
105 | * @devs: array of platform devices to add | |
106 | * @num: number of platform devices in array | |
1da177e4 LT |
107 | */ |
108 | int platform_add_devices(struct platform_device **devs, int num) | |
109 | { | |
110 | int i, ret = 0; | |
111 | ||
112 | for (i = 0; i < num; i++) { | |
113 | ret = platform_device_register(devs[i]); | |
114 | if (ret) { | |
115 | while (--i >= 0) | |
116 | platform_device_unregister(devs[i]); | |
117 | break; | |
118 | } | |
119 | } | |
120 | ||
121 | return ret; | |
122 | } | |
a96b2042 | 123 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 124 | |
37c12e74 RK |
125 | struct platform_object { |
126 | struct platform_device pdev; | |
127 | char name[1]; | |
128 | }; | |
129 | ||
1da177e4 | 130 | /** |
3c31f07a | 131 | * platform_device_put - destroy a platform device |
4a3ad20c | 132 | * @pdev: platform device to free |
37c12e74 | 133 | * |
4a3ad20c GKH |
134 | * Free all memory associated with a platform device. This function must |
135 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
136 | */ |
137 | void platform_device_put(struct platform_device *pdev) | |
138 | { | |
139 | if (pdev) | |
140 | put_device(&pdev->dev); | |
141 | } | |
142 | EXPORT_SYMBOL_GPL(platform_device_put); | |
143 | ||
144 | static void platform_device_release(struct device *dev) | |
145 | { | |
4a3ad20c GKH |
146 | struct platform_object *pa = container_of(dev, struct platform_object, |
147 | pdev.dev); | |
37c12e74 RK |
148 | |
149 | kfree(pa->pdev.dev.platform_data); | |
150 | kfree(pa->pdev.resource); | |
151 | kfree(pa); | |
152 | } | |
153 | ||
154 | /** | |
3c31f07a | 155 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
156 | * @name: base name of the device we're adding |
157 | * @id: instance id | |
37c12e74 | 158 | * |
4a3ad20c GKH |
159 | * Create a platform device object which can have other objects attached |
160 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 161 | */ |
1359555e | 162 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
163 | { |
164 | struct platform_object *pa; | |
165 | ||
166 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); | |
167 | if (pa) { | |
168 | strcpy(pa->name, name); | |
169 | pa->pdev.name = pa->name; | |
170 | pa->pdev.id = id; | |
171 | device_initialize(&pa->pdev.dev); | |
172 | pa->pdev.dev.release = platform_device_release; | |
173 | } | |
174 | ||
93ce3061 | 175 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
176 | } |
177 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
178 | ||
179 | /** | |
3c31f07a | 180 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
181 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
182 | * @res: set of resources that needs to be allocated for the device | |
183 | * @num: number of resources | |
37c12e74 | 184 | * |
4a3ad20c GKH |
185 | * Add a copy of the resources to the platform device. The memory |
186 | * associated with the resources will be freed when the platform device is | |
187 | * released. | |
37c12e74 | 188 | */ |
4a3ad20c | 189 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 190 | const struct resource *res, unsigned int num) |
37c12e74 RK |
191 | { |
192 | struct resource *r; | |
193 | ||
3e61dfd8 | 194 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); |
37c12e74 | 195 | if (r) { |
37c12e74 RK |
196 | pdev->resource = r; |
197 | pdev->num_resources = num; | |
3e61dfd8 | 198 | return 0; |
37c12e74 | 199 | } |
3e61dfd8 | 200 | return -ENOMEM; |
37c12e74 RK |
201 | } |
202 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
203 | ||
204 | /** | |
3c31f07a | 205 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
206 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
207 | * @data: platform specific data for this platform device | |
208 | * @size: size of platform specific data | |
37c12e74 | 209 | * |
4a3ad20c GKH |
210 | * Add a copy of platform specific data to the platform device's |
211 | * platform_data pointer. The memory associated with the platform data | |
212 | * will be freed when the platform device is released. | |
37c12e74 | 213 | */ |
4a3ad20c GKH |
214 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
215 | size_t size) | |
37c12e74 | 216 | { |
daa41226 | 217 | void *d = kmemdup(data, size, GFP_KERNEL); |
37c12e74 | 218 | |
37c12e74 | 219 | if (d) { |
37c12e74 | 220 | pdev->dev.platform_data = d; |
daa41226 | 221 | return 0; |
37c12e74 | 222 | } |
daa41226 | 223 | return -ENOMEM; |
37c12e74 RK |
224 | } |
225 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
226 | ||
227 | /** | |
4a3ad20c GKH |
228 | * platform_device_add - add a platform device to device hierarchy |
229 | * @pdev: platform device we're adding | |
1da177e4 | 230 | * |
4a3ad20c GKH |
231 | * This is part 2 of platform_device_register(), though may be called |
232 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 233 | */ |
37c12e74 | 234 | int platform_device_add(struct platform_device *pdev) |
1da177e4 LT |
235 | { |
236 | int i, ret = 0; | |
237 | ||
238 | if (!pdev) | |
239 | return -EINVAL; | |
240 | ||
241 | if (!pdev->dev.parent) | |
242 | pdev->dev.parent = &platform_bus; | |
243 | ||
244 | pdev->dev.bus = &platform_bus_type; | |
245 | ||
246 | if (pdev->id != -1) | |
1e0b2cf9 | 247 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
1da177e4 | 248 | else |
acc0e90f | 249 | dev_set_name(&pdev->dev, "%s", pdev->name); |
1da177e4 LT |
250 | |
251 | for (i = 0; i < pdev->num_resources; i++) { | |
252 | struct resource *p, *r = &pdev->resource[i]; | |
253 | ||
254 | if (r->name == NULL) | |
1e0b2cf9 | 255 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
256 | |
257 | p = r->parent; | |
258 | if (!p) { | |
c9f66169 | 259 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 260 | p = &iomem_resource; |
c9f66169 | 261 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
262 | p = &ioport_resource; |
263 | } | |
264 | ||
d960bb4d | 265 | if (p && insert_resource(p, r)) { |
1da177e4 LT |
266 | printk(KERN_ERR |
267 | "%s: failed to claim resource %d\n", | |
1e0b2cf9 | 268 | dev_name(&pdev->dev), i); |
1da177e4 LT |
269 | ret = -EBUSY; |
270 | goto failed; | |
271 | } | |
272 | } | |
273 | ||
274 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 275 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 276 | |
e3915532 | 277 | ret = device_add(&pdev->dev); |
1da177e4 LT |
278 | if (ret == 0) |
279 | return ret; | |
280 | ||
281 | failed: | |
c9f66169 MD |
282 | while (--i >= 0) { |
283 | struct resource *r = &pdev->resource[i]; | |
284 | unsigned long type = resource_type(r); | |
285 | ||
286 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
287 | release_resource(r); | |
288 | } | |
289 | ||
1da177e4 LT |
290 | return ret; |
291 | } | |
37c12e74 RK |
292 | EXPORT_SYMBOL_GPL(platform_device_add); |
293 | ||
294 | /** | |
4a3ad20c GKH |
295 | * platform_device_del - remove a platform-level device |
296 | * @pdev: platform device we're removing | |
1da177e4 | 297 | * |
4a3ad20c GKH |
298 | * Note that this function will also release all memory- and port-based |
299 | * resources owned by the device (@dev->resource). This function must | |
300 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 301 | */ |
93ce3061 | 302 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
303 | { |
304 | int i; | |
305 | ||
306 | if (pdev) { | |
dc4c15d4 JD |
307 | device_del(&pdev->dev); |
308 | ||
1da177e4 LT |
309 | for (i = 0; i < pdev->num_resources; i++) { |
310 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
311 | unsigned long type = resource_type(r); |
312 | ||
313 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
314 | release_resource(r); |
315 | } | |
1da177e4 LT |
316 | } |
317 | } | |
93ce3061 DT |
318 | EXPORT_SYMBOL_GPL(platform_device_del); |
319 | ||
320 | /** | |
4a3ad20c GKH |
321 | * platform_device_register - add a platform-level device |
322 | * @pdev: platform device we're adding | |
93ce3061 | 323 | */ |
4a3ad20c | 324 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
325 | { |
326 | device_initialize(&pdev->dev); | |
327 | return platform_device_add(pdev); | |
328 | } | |
a96b2042 | 329 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
330 | |
331 | /** | |
4a3ad20c GKH |
332 | * platform_device_unregister - unregister a platform-level device |
333 | * @pdev: platform device we're unregistering | |
93ce3061 | 334 | * |
4a3ad20c GKH |
335 | * Unregistration is done in 2 steps. First we release all resources |
336 | * and remove it from the subsystem, then we drop reference count by | |
337 | * calling platform_device_put(). | |
93ce3061 | 338 | */ |
4a3ad20c | 339 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
340 | { |
341 | platform_device_del(pdev); | |
342 | platform_device_put(pdev); | |
343 | } | |
a96b2042 | 344 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 345 | |
1da177e4 | 346 | /** |
3c31f07a | 347 | * platform_device_register_simple - add a platform-level device and its resources |
4a3ad20c GKH |
348 | * @name: base name of the device we're adding |
349 | * @id: instance id | |
350 | * @res: set of resources that needs to be allocated for the device | |
351 | * @num: number of resources | |
1da177e4 | 352 | * |
4a3ad20c GKH |
353 | * This function creates a simple platform device that requires minimal |
354 | * resource and memory management. Canned release function freeing memory | |
355 | * allocated for the device allows drivers using such devices to be | |
356 | * unloaded without waiting for the last reference to the device to be | |
357 | * dropped. | |
49a4ec18 | 358 | * |
4a3ad20c GKH |
359 | * This interface is primarily intended for use with legacy drivers which |
360 | * probe hardware directly. Because such drivers create sysfs device nodes | |
361 | * themselves, rather than letting system infrastructure handle such device | |
362 | * enumeration tasks, they don't fully conform to the Linux driver model. | |
363 | * In particular, when such drivers are built as modules, they can't be | |
364 | * "hotplugged". | |
f0eae0ed JN |
365 | * |
366 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
1da177e4 | 367 | */ |
4a3ad20c GKH |
368 | struct platform_device *platform_device_register_simple(const char *name, |
369 | int id, | |
0b7f1a7e | 370 | const struct resource *res, |
4a3ad20c | 371 | unsigned int num) |
1da177e4 | 372 | { |
37c12e74 | 373 | struct platform_device *pdev; |
1da177e4 LT |
374 | int retval; |
375 | ||
37c12e74 RK |
376 | pdev = platform_device_alloc(name, id); |
377 | if (!pdev) { | |
1da177e4 LT |
378 | retval = -ENOMEM; |
379 | goto error; | |
380 | } | |
381 | ||
1da177e4 | 382 | if (num) { |
37c12e74 RK |
383 | retval = platform_device_add_resources(pdev, res, num); |
384 | if (retval) | |
385 | goto error; | |
1da177e4 LT |
386 | } |
387 | ||
37c12e74 | 388 | retval = platform_device_add(pdev); |
1da177e4 LT |
389 | if (retval) |
390 | goto error; | |
391 | ||
37c12e74 | 392 | return pdev; |
1da177e4 LT |
393 | |
394 | error: | |
37c12e74 | 395 | platform_device_put(pdev); |
1da177e4 LT |
396 | return ERR_PTR(retval); |
397 | } | |
a96b2042 | 398 | EXPORT_SYMBOL_GPL(platform_device_register_simple); |
1da177e4 | 399 | |
d8bf2540 | 400 | /** |
3c31f07a | 401 | * platform_device_register_data - add a platform-level device with platform-specific data |
d8bf2540 DES |
402 | * @parent: parent device for the device we're adding |
403 | * @name: base name of the device we're adding | |
404 | * @id: instance id | |
405 | * @data: platform specific data for this platform device | |
406 | * @size: size of platform specific data | |
407 | * | |
408 | * This function creates a simple platform device that requires minimal | |
409 | * resource and memory management. Canned release function freeing memory | |
410 | * allocated for the device allows drivers using such devices to be | |
411 | * unloaded without waiting for the last reference to the device to be | |
412 | * dropped. | |
f0eae0ed JN |
413 | * |
414 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
d8bf2540 DES |
415 | */ |
416 | struct platform_device *platform_device_register_data( | |
417 | struct device *parent, | |
418 | const char *name, int id, | |
419 | const void *data, size_t size) | |
420 | { | |
421 | struct platform_device *pdev; | |
422 | int retval; | |
423 | ||
424 | pdev = platform_device_alloc(name, id); | |
425 | if (!pdev) { | |
426 | retval = -ENOMEM; | |
427 | goto error; | |
428 | } | |
429 | ||
430 | pdev->dev.parent = parent; | |
431 | ||
432 | if (size) { | |
433 | retval = platform_device_add_data(pdev, data, size); | |
434 | if (retval) | |
435 | goto error; | |
436 | } | |
437 | ||
438 | retval = platform_device_add(pdev); | |
439 | if (retval) | |
440 | goto error; | |
441 | ||
442 | return pdev; | |
443 | ||
444 | error: | |
445 | platform_device_put(pdev); | |
446 | return ERR_PTR(retval); | |
447 | } | |
0787fdf7 | 448 | EXPORT_SYMBOL_GPL(platform_device_register_data); |
d8bf2540 | 449 | |
00d3dcdd RK |
450 | static int platform_drv_probe(struct device *_dev) |
451 | { | |
452 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
453 | struct platform_device *dev = to_platform_device(_dev); | |
454 | ||
455 | return drv->probe(dev); | |
456 | } | |
457 | ||
c67334fb DB |
458 | static int platform_drv_probe_fail(struct device *_dev) |
459 | { | |
460 | return -ENXIO; | |
461 | } | |
462 | ||
00d3dcdd RK |
463 | static int platform_drv_remove(struct device *_dev) |
464 | { | |
465 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
466 | struct platform_device *dev = to_platform_device(_dev); | |
467 | ||
468 | return drv->remove(dev); | |
469 | } | |
470 | ||
471 | static void platform_drv_shutdown(struct device *_dev) | |
472 | { | |
473 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
474 | struct platform_device *dev = to_platform_device(_dev); | |
475 | ||
476 | drv->shutdown(dev); | |
477 | } | |
478 | ||
00d3dcdd | 479 | /** |
3c31f07a | 480 | * platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 481 | * @drv: platform driver structure |
00d3dcdd RK |
482 | */ |
483 | int platform_driver_register(struct platform_driver *drv) | |
484 | { | |
485 | drv->driver.bus = &platform_bus_type; | |
486 | if (drv->probe) | |
487 | drv->driver.probe = platform_drv_probe; | |
488 | if (drv->remove) | |
489 | drv->driver.remove = platform_drv_remove; | |
490 | if (drv->shutdown) | |
491 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 492 | |
00d3dcdd RK |
493 | return driver_register(&drv->driver); |
494 | } | |
495 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
496 | ||
497 | /** | |
3c31f07a | 498 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 499 | * @drv: platform driver structure |
00d3dcdd RK |
500 | */ |
501 | void platform_driver_unregister(struct platform_driver *drv) | |
502 | { | |
503 | driver_unregister(&drv->driver); | |
504 | } | |
505 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
506 | ||
c67334fb DB |
507 | /** |
508 | * platform_driver_probe - register driver for non-hotpluggable device | |
509 | * @drv: platform driver structure | |
510 | * @probe: the driver probe routine, probably from an __init section | |
511 | * | |
512 | * Use this instead of platform_driver_register() when you know the device | |
513 | * is not hotpluggable and has already been registered, and you want to | |
514 | * remove its run-once probe() infrastructure from memory after the driver | |
515 | * has bound to the device. | |
516 | * | |
517 | * One typical use for this would be with drivers for controllers integrated | |
518 | * into system-on-chip processors, where the controller devices have been | |
519 | * configured as part of board setup. | |
520 | * | |
521 | * Returns zero if the driver registered and bound to a device, else returns | |
522 | * a negative error code and with the driver not registered. | |
523 | */ | |
c63e0783 | 524 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
525 | int (*probe)(struct platform_device *)) |
526 | { | |
527 | int retval, code; | |
528 | ||
1a6f2a75 DT |
529 | /* make sure driver won't have bind/unbind attributes */ |
530 | drv->driver.suppress_bind_attrs = true; | |
531 | ||
c67334fb DB |
532 | /* temporary section violation during probe() */ |
533 | drv->probe = probe; | |
534 | retval = code = platform_driver_register(drv); | |
535 | ||
1a6f2a75 DT |
536 | /* |
537 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
538 | * the list of drivers in order to probe new devices. Check to see |
539 | * if the probe was successful, and make sure any forced probes of | |
540 | * new devices fail. | |
541 | */ | |
c6f7e72a | 542 | spin_lock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb | 543 | drv->probe = NULL; |
e5dd1278 | 544 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
545 | retval = -ENODEV; |
546 | drv->driver.probe = platform_drv_probe_fail; | |
c6f7e72a | 547 | spin_unlock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb DB |
548 | |
549 | if (code != retval) | |
550 | platform_driver_unregister(drv); | |
551 | return retval; | |
552 | } | |
553 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 554 | |
ecdf6ceb DT |
555 | /** |
556 | * platform_create_bundle - register driver and create corresponding device | |
557 | * @driver: platform driver structure | |
558 | * @probe: the driver probe routine, probably from an __init section | |
559 | * @res: set of resources that needs to be allocated for the device | |
560 | * @n_res: number of resources | |
561 | * @data: platform specific data for this platform device | |
562 | * @size: size of platform specific data | |
563 | * | |
564 | * Use this in legacy-style modules that probe hardware directly and | |
565 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
566 | * |
567 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb DT |
568 | */ |
569 | struct platform_device * __init_or_module platform_create_bundle( | |
570 | struct platform_driver *driver, | |
571 | int (*probe)(struct platform_device *), | |
572 | struct resource *res, unsigned int n_res, | |
573 | const void *data, size_t size) | |
574 | { | |
575 | struct platform_device *pdev; | |
576 | int error; | |
577 | ||
578 | pdev = platform_device_alloc(driver->driver.name, -1); | |
579 | if (!pdev) { | |
580 | error = -ENOMEM; | |
581 | goto err_out; | |
582 | } | |
583 | ||
584 | if (res) { | |
585 | error = platform_device_add_resources(pdev, res, n_res); | |
586 | if (error) | |
587 | goto err_pdev_put; | |
588 | } | |
589 | ||
590 | if (data) { | |
591 | error = platform_device_add_data(pdev, data, size); | |
592 | if (error) | |
593 | goto err_pdev_put; | |
594 | } | |
595 | ||
596 | error = platform_device_add(pdev); | |
597 | if (error) | |
598 | goto err_pdev_put; | |
599 | ||
600 | error = platform_driver_probe(driver, probe); | |
601 | if (error) | |
602 | goto err_pdev_del; | |
603 | ||
604 | return pdev; | |
605 | ||
606 | err_pdev_del: | |
607 | platform_device_del(pdev); | |
608 | err_pdev_put: | |
609 | platform_device_put(pdev); | |
610 | err_out: | |
611 | return ERR_PTR(error); | |
612 | } | |
613 | EXPORT_SYMBOL_GPL(platform_create_bundle); | |
614 | ||
a0245f7a DB |
615 | /* modalias support enables more hands-off userspace setup: |
616 | * (a) environment variable lets new-style hotplug events work once system is | |
617 | * fully running: "modprobe $MODALIAS" | |
618 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
619 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
620 | */ | |
4a3ad20c GKH |
621 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
622 | char *buf) | |
a0245f7a DB |
623 | { |
624 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 625 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
626 | |
627 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
628 | } | |
629 | ||
630 | static struct device_attribute platform_dev_attrs[] = { | |
631 | __ATTR_RO(modalias), | |
632 | __ATTR_NULL, | |
633 | }; | |
634 | ||
7eff2e7a | 635 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
636 | { |
637 | struct platform_device *pdev = to_platform_device(dev); | |
638 | ||
57fee4a5 EM |
639 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
640 | (pdev->id_entry) ? pdev->id_entry->name : pdev->name); | |
a0245f7a DB |
641 | return 0; |
642 | } | |
643 | ||
57fee4a5 | 644 | static const struct platform_device_id *platform_match_id( |
831fad2f | 645 | const struct platform_device_id *id, |
57fee4a5 EM |
646 | struct platform_device *pdev) |
647 | { | |
648 | while (id->name[0]) { | |
649 | if (strcmp(pdev->name, id->name) == 0) { | |
650 | pdev->id_entry = id; | |
651 | return id; | |
652 | } | |
653 | id++; | |
654 | } | |
655 | return NULL; | |
656 | } | |
657 | ||
1da177e4 | 658 | /** |
4a3ad20c GKH |
659 | * platform_match - bind platform device to platform driver. |
660 | * @dev: device. | |
661 | * @drv: driver. | |
1da177e4 | 662 | * |
4a3ad20c GKH |
663 | * Platform device IDs are assumed to be encoded like this: |
664 | * "<name><instance>", where <name> is a short description of the type of | |
665 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
666 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
667 | * "<name>". So, extract the <name> from the platform_device structure, | |
668 | * and compare it against the name of the driver. Return whether they match | |
669 | * or not. | |
1da177e4 | 670 | */ |
4a3ad20c | 671 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 672 | { |
71b3e0c1 | 673 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
674 | struct platform_driver *pdrv = to_platform_driver(drv); |
675 | ||
676 | /* match against the id table first */ | |
677 | if (pdrv->id_table) | |
678 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 679 | |
57fee4a5 | 680 | /* fall-back to driver name match */ |
1e0b2cf9 | 681 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
682 | } |
683 | ||
25e18499 RW |
684 | #ifdef CONFIG_PM_SLEEP |
685 | ||
686 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 687 | { |
783ea7d4 MD |
688 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
689 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
690 | int ret = 0; |
691 | ||
783ea7d4 MD |
692 | if (dev->driver && pdrv->suspend) |
693 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
694 | |
695 | return ret; | |
696 | } | |
697 | ||
25e18499 | 698 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 699 | { |
783ea7d4 MD |
700 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
701 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
702 | int ret = 0; |
703 | ||
783ea7d4 MD |
704 | if (dev->driver && pdrv->resume) |
705 | ret = pdrv->resume(pdev); | |
9480e307 | 706 | |
1da177e4 LT |
707 | return ret; |
708 | } | |
709 | ||
25e18499 RW |
710 | static int platform_pm_prepare(struct device *dev) |
711 | { | |
712 | struct device_driver *drv = dev->driver; | |
713 | int ret = 0; | |
714 | ||
715 | if (drv && drv->pm && drv->pm->prepare) | |
716 | ret = drv->pm->prepare(dev); | |
717 | ||
718 | return ret; | |
719 | } | |
720 | ||
721 | static void platform_pm_complete(struct device *dev) | |
722 | { | |
723 | struct device_driver *drv = dev->driver; | |
724 | ||
725 | if (drv && drv->pm && drv->pm->complete) | |
726 | drv->pm->complete(dev); | |
727 | } | |
728 | ||
9d730229 MD |
729 | #else /* !CONFIG_PM_SLEEP */ |
730 | ||
731 | #define platform_pm_prepare NULL | |
732 | #define platform_pm_complete NULL | |
733 | ||
734 | #endif /* !CONFIG_PM_SLEEP */ | |
735 | ||
25e18499 RW |
736 | #ifdef CONFIG_SUSPEND |
737 | ||
190e8370 | 738 | int __weak platform_pm_suspend(struct device *dev) |
25e18499 RW |
739 | { |
740 | struct device_driver *drv = dev->driver; | |
741 | int ret = 0; | |
742 | ||
adf09493 RW |
743 | if (!drv) |
744 | return 0; | |
745 | ||
746 | if (drv->pm) { | |
25e18499 RW |
747 | if (drv->pm->suspend) |
748 | ret = drv->pm->suspend(dev); | |
749 | } else { | |
750 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
751 | } | |
752 | ||
753 | return ret; | |
754 | } | |
755 | ||
190e8370 | 756 | int __weak platform_pm_suspend_noirq(struct device *dev) |
25e18499 | 757 | { |
adf09493 | 758 | struct device_driver *drv = dev->driver; |
25e18499 RW |
759 | int ret = 0; |
760 | ||
adf09493 | 761 | if (!drv) |
25e18499 RW |
762 | return 0; |
763 | ||
adf09493 RW |
764 | if (drv->pm) { |
765 | if (drv->pm->suspend_noirq) | |
766 | ret = drv->pm->suspend_noirq(dev); | |
25e18499 RW |
767 | } |
768 | ||
769 | return ret; | |
770 | } | |
771 | ||
190e8370 | 772 | int __weak platform_pm_resume(struct device *dev) |
25e18499 RW |
773 | { |
774 | struct device_driver *drv = dev->driver; | |
775 | int ret = 0; | |
776 | ||
adf09493 RW |
777 | if (!drv) |
778 | return 0; | |
779 | ||
780 | if (drv->pm) { | |
25e18499 RW |
781 | if (drv->pm->resume) |
782 | ret = drv->pm->resume(dev); | |
783 | } else { | |
784 | ret = platform_legacy_resume(dev); | |
785 | } | |
786 | ||
787 | return ret; | |
788 | } | |
789 | ||
190e8370 | 790 | int __weak platform_pm_resume_noirq(struct device *dev) |
25e18499 | 791 | { |
adf09493 | 792 | struct device_driver *drv = dev->driver; |
25e18499 RW |
793 | int ret = 0; |
794 | ||
adf09493 | 795 | if (!drv) |
25e18499 RW |
796 | return 0; |
797 | ||
adf09493 RW |
798 | if (drv->pm) { |
799 | if (drv->pm->resume_noirq) | |
800 | ret = drv->pm->resume_noirq(dev); | |
25e18499 RW |
801 | } |
802 | ||
803 | return ret; | |
804 | } | |
805 | ||
806 | #else /* !CONFIG_SUSPEND */ | |
807 | ||
808 | #define platform_pm_suspend NULL | |
809 | #define platform_pm_resume NULL | |
810 | #define platform_pm_suspend_noirq NULL | |
811 | #define platform_pm_resume_noirq NULL | |
812 | ||
813 | #endif /* !CONFIG_SUSPEND */ | |
814 | ||
815 | #ifdef CONFIG_HIBERNATION | |
816 | ||
817 | static int platform_pm_freeze(struct device *dev) | |
818 | { | |
819 | struct device_driver *drv = dev->driver; | |
820 | int ret = 0; | |
821 | ||
822 | if (!drv) | |
823 | return 0; | |
824 | ||
825 | if (drv->pm) { | |
826 | if (drv->pm->freeze) | |
827 | ret = drv->pm->freeze(dev); | |
828 | } else { | |
829 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
830 | } | |
831 | ||
832 | return ret; | |
833 | } | |
834 | ||
835 | static int platform_pm_freeze_noirq(struct device *dev) | |
836 | { | |
adf09493 | 837 | struct device_driver *drv = dev->driver; |
25e18499 RW |
838 | int ret = 0; |
839 | ||
adf09493 | 840 | if (!drv) |
25e18499 RW |
841 | return 0; |
842 | ||
adf09493 RW |
843 | if (drv->pm) { |
844 | if (drv->pm->freeze_noirq) | |
845 | ret = drv->pm->freeze_noirq(dev); | |
25e18499 RW |
846 | } |
847 | ||
848 | return ret; | |
849 | } | |
850 | ||
851 | static int platform_pm_thaw(struct device *dev) | |
852 | { | |
853 | struct device_driver *drv = dev->driver; | |
854 | int ret = 0; | |
855 | ||
adf09493 RW |
856 | if (!drv) |
857 | return 0; | |
858 | ||
859 | if (drv->pm) { | |
25e18499 RW |
860 | if (drv->pm->thaw) |
861 | ret = drv->pm->thaw(dev); | |
862 | } else { | |
863 | ret = platform_legacy_resume(dev); | |
864 | } | |
865 | ||
866 | return ret; | |
867 | } | |
868 | ||
869 | static int platform_pm_thaw_noirq(struct device *dev) | |
870 | { | |
adf09493 | 871 | struct device_driver *drv = dev->driver; |
25e18499 RW |
872 | int ret = 0; |
873 | ||
adf09493 | 874 | if (!drv) |
25e18499 RW |
875 | return 0; |
876 | ||
adf09493 RW |
877 | if (drv->pm) { |
878 | if (drv->pm->thaw_noirq) | |
879 | ret = drv->pm->thaw_noirq(dev); | |
25e18499 RW |
880 | } |
881 | ||
882 | return ret; | |
883 | } | |
884 | ||
885 | static int platform_pm_poweroff(struct device *dev) | |
886 | { | |
887 | struct device_driver *drv = dev->driver; | |
888 | int ret = 0; | |
889 | ||
adf09493 RW |
890 | if (!drv) |
891 | return 0; | |
892 | ||
893 | if (drv->pm) { | |
25e18499 RW |
894 | if (drv->pm->poweroff) |
895 | ret = drv->pm->poweroff(dev); | |
896 | } else { | |
897 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
898 | } | |
899 | ||
900 | return ret; | |
901 | } | |
902 | ||
903 | static int platform_pm_poweroff_noirq(struct device *dev) | |
904 | { | |
adf09493 | 905 | struct device_driver *drv = dev->driver; |
25e18499 RW |
906 | int ret = 0; |
907 | ||
adf09493 | 908 | if (!drv) |
25e18499 RW |
909 | return 0; |
910 | ||
adf09493 RW |
911 | if (drv->pm) { |
912 | if (drv->pm->poweroff_noirq) | |
913 | ret = drv->pm->poweroff_noirq(dev); | |
25e18499 RW |
914 | } |
915 | ||
916 | return ret; | |
917 | } | |
918 | ||
919 | static int platform_pm_restore(struct device *dev) | |
920 | { | |
921 | struct device_driver *drv = dev->driver; | |
922 | int ret = 0; | |
923 | ||
adf09493 RW |
924 | if (!drv) |
925 | return 0; | |
926 | ||
927 | if (drv->pm) { | |
25e18499 RW |
928 | if (drv->pm->restore) |
929 | ret = drv->pm->restore(dev); | |
930 | } else { | |
931 | ret = platform_legacy_resume(dev); | |
932 | } | |
933 | ||
934 | return ret; | |
935 | } | |
936 | ||
937 | static int platform_pm_restore_noirq(struct device *dev) | |
938 | { | |
adf09493 | 939 | struct device_driver *drv = dev->driver; |
25e18499 RW |
940 | int ret = 0; |
941 | ||
adf09493 | 942 | if (!drv) |
25e18499 RW |
943 | return 0; |
944 | ||
adf09493 RW |
945 | if (drv->pm) { |
946 | if (drv->pm->restore_noirq) | |
947 | ret = drv->pm->restore_noirq(dev); | |
25e18499 RW |
948 | } |
949 | ||
950 | return ret; | |
951 | } | |
952 | ||
953 | #else /* !CONFIG_HIBERNATION */ | |
954 | ||
955 | #define platform_pm_freeze NULL | |
956 | #define platform_pm_thaw NULL | |
957 | #define platform_pm_poweroff NULL | |
958 | #define platform_pm_restore NULL | |
959 | #define platform_pm_freeze_noirq NULL | |
960 | #define platform_pm_thaw_noirq NULL | |
961 | #define platform_pm_poweroff_noirq NULL | |
962 | #define platform_pm_restore_noirq NULL | |
963 | ||
964 | #endif /* !CONFIG_HIBERNATION */ | |
965 | ||
9d730229 MD |
966 | #ifdef CONFIG_PM_RUNTIME |
967 | ||
968 | int __weak platform_pm_runtime_suspend(struct device *dev) | |
969 | { | |
543f2503 | 970 | return pm_generic_runtime_suspend(dev); |
9d730229 MD |
971 | }; |
972 | ||
973 | int __weak platform_pm_runtime_resume(struct device *dev) | |
974 | { | |
543f2503 | 975 | return pm_generic_runtime_resume(dev); |
9d730229 MD |
976 | }; |
977 | ||
978 | int __weak platform_pm_runtime_idle(struct device *dev) | |
979 | { | |
543f2503 | 980 | return pm_generic_runtime_idle(dev); |
9d730229 MD |
981 | }; |
982 | ||
983 | #else /* !CONFIG_PM_RUNTIME */ | |
984 | ||
985 | #define platform_pm_runtime_suspend NULL | |
986 | #define platform_pm_runtime_resume NULL | |
987 | #define platform_pm_runtime_idle NULL | |
988 | ||
989 | #endif /* !CONFIG_PM_RUNTIME */ | |
990 | ||
d9ab7716 | 991 | static const struct dev_pm_ops platform_dev_pm_ops = { |
adf09493 RW |
992 | .prepare = platform_pm_prepare, |
993 | .complete = platform_pm_complete, | |
994 | .suspend = platform_pm_suspend, | |
995 | .resume = platform_pm_resume, | |
996 | .freeze = platform_pm_freeze, | |
997 | .thaw = platform_pm_thaw, | |
998 | .poweroff = platform_pm_poweroff, | |
999 | .restore = platform_pm_restore, | |
25e18499 RW |
1000 | .suspend_noirq = platform_pm_suspend_noirq, |
1001 | .resume_noirq = platform_pm_resume_noirq, | |
1002 | .freeze_noirq = platform_pm_freeze_noirq, | |
1003 | .thaw_noirq = platform_pm_thaw_noirq, | |
1004 | .poweroff_noirq = platform_pm_poweroff_noirq, | |
1005 | .restore_noirq = platform_pm_restore_noirq, | |
9d730229 MD |
1006 | .runtime_suspend = platform_pm_runtime_suspend, |
1007 | .runtime_resume = platform_pm_runtime_resume, | |
1008 | .runtime_idle = platform_pm_runtime_idle, | |
25e18499 RW |
1009 | }; |
1010 | ||
1da177e4 LT |
1011 | struct bus_type platform_bus_type = { |
1012 | .name = "platform", | |
a0245f7a | 1013 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 1014 | .match = platform_match, |
a0245f7a | 1015 | .uevent = platform_uevent, |
9d730229 | 1016 | .pm = &platform_dev_pm_ops, |
1da177e4 | 1017 | }; |
a96b2042 | 1018 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
1019 | |
1020 | int __init platform_bus_init(void) | |
1021 | { | |
fbfb1445 CH |
1022 | int error; |
1023 | ||
13977091 MD |
1024 | early_platform_cleanup(); |
1025 | ||
fbfb1445 CH |
1026 | error = device_register(&platform_bus); |
1027 | if (error) | |
1028 | return error; | |
1029 | error = bus_register(&platform_bus_type); | |
1030 | if (error) | |
1031 | device_unregister(&platform_bus); | |
1032 | return error; | |
1da177e4 LT |
1033 | } |
1034 | ||
1035 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
1036 | u64 dma_get_required_mask(struct device *dev) | |
1037 | { | |
1038 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
1039 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
1040 | u64 mask; | |
1041 | ||
1042 | if (!high_totalram) { | |
1043 | /* convert to mask just covering totalram */ | |
1044 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
1045 | low_totalram += low_totalram - 1; | |
1046 | mask = low_totalram; | |
1047 | } else { | |
1048 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
1049 | high_totalram += high_totalram - 1; | |
1050 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
1051 | } | |
e88a0c2c | 1052 | return mask; |
1da177e4 LT |
1053 | } |
1054 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
1055 | #endif | |
13977091 MD |
1056 | |
1057 | static __initdata LIST_HEAD(early_platform_driver_list); | |
1058 | static __initdata LIST_HEAD(early_platform_device_list); | |
1059 | ||
1060 | /** | |
4d26e139 | 1061 | * early_platform_driver_register - register early platform driver |
d86c1302 | 1062 | * @epdrv: early_platform driver structure |
13977091 | 1063 | * @buf: string passed from early_param() |
4d26e139 MD |
1064 | * |
1065 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
1066 | */ |
1067 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
1068 | char *buf) | |
1069 | { | |
c60e0504 | 1070 | char *tmp; |
13977091 MD |
1071 | int n; |
1072 | ||
1073 | /* Simply add the driver to the end of the global list. | |
1074 | * Drivers will by default be put on the list in compiled-in order. | |
1075 | */ | |
1076 | if (!epdrv->list.next) { | |
1077 | INIT_LIST_HEAD(&epdrv->list); | |
1078 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
1079 | } | |
1080 | ||
1081 | /* If the user has specified device then make sure the driver | |
1082 | * gets prioritized. The driver of the last device specified on | |
1083 | * command line will be put first on the list. | |
1084 | */ | |
1085 | n = strlen(epdrv->pdrv->driver.name); | |
1086 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
1087 | list_move(&epdrv->list, &early_platform_driver_list); | |
1088 | ||
c60e0504 MD |
1089 | /* Allow passing parameters after device name */ |
1090 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 1091 | epdrv->requested_id = -1; |
c60e0504 MD |
1092 | else { |
1093 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
1094 | &tmp, 10); | |
1095 | ||
1096 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
1097 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
1098 | n = 0; | |
1099 | } else | |
1100 | n += strcspn(&buf[n + 1], ",") + 1; | |
1101 | } | |
1102 | ||
1103 | if (buf[n] == ',') | |
1104 | n++; | |
1105 | ||
1106 | if (epdrv->bufsize) { | |
1107 | memcpy(epdrv->buffer, &buf[n], | |
1108 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
1109 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
1110 | } | |
13977091 MD |
1111 | } |
1112 | ||
1113 | return 0; | |
1114 | } | |
1115 | ||
1116 | /** | |
4d26e139 | 1117 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
1118 | * @devs: array of early platform devices to add |
1119 | * @num: number of early platform devices in array | |
4d26e139 MD |
1120 | * |
1121 | * Used by early architecture code to register early platform devices and | |
1122 | * their platform data. | |
13977091 MD |
1123 | */ |
1124 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1125 | { | |
1126 | struct device *dev; | |
1127 | int i; | |
1128 | ||
1129 | /* simply add the devices to list */ | |
1130 | for (i = 0; i < num; i++) { | |
1131 | dev = &devs[i]->dev; | |
1132 | ||
1133 | if (!dev->devres_head.next) { | |
1134 | INIT_LIST_HEAD(&dev->devres_head); | |
1135 | list_add_tail(&dev->devres_head, | |
1136 | &early_platform_device_list); | |
1137 | } | |
1138 | } | |
1139 | } | |
1140 | ||
1141 | /** | |
4d26e139 | 1142 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 1143 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
1144 | * |
1145 | * Used by architecture code to register all early platform drivers | |
1146 | * for a certain class. If omitted then only early platform drivers | |
1147 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
1148 | */ |
1149 | void __init early_platform_driver_register_all(char *class_str) | |
1150 | { | |
1151 | /* The "class_str" parameter may or may not be present on the kernel | |
1152 | * command line. If it is present then there may be more than one | |
1153 | * matching parameter. | |
1154 | * | |
1155 | * Since we register our early platform drivers using early_param() | |
1156 | * we need to make sure that they also get registered in the case | |
1157 | * when the parameter is missing from the kernel command line. | |
1158 | * | |
1159 | * We use parse_early_options() to make sure the early_param() gets | |
1160 | * called at least once. The early_param() may be called more than | |
1161 | * once since the name of the preferred device may be specified on | |
1162 | * the kernel command line. early_platform_driver_register() handles | |
1163 | * this case for us. | |
1164 | */ | |
1165 | parse_early_options(class_str); | |
1166 | } | |
1167 | ||
1168 | /** | |
4d26e139 | 1169 | * early_platform_match - find early platform device matching driver |
d86c1302 | 1170 | * @epdrv: early platform driver structure |
13977091 MD |
1171 | * @id: id to match against |
1172 | */ | |
1173 | static __init struct platform_device * | |
1174 | early_platform_match(struct early_platform_driver *epdrv, int id) | |
1175 | { | |
1176 | struct platform_device *pd; | |
1177 | ||
1178 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1179 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1180 | if (pd->id == id) | |
1181 | return pd; | |
1182 | ||
1183 | return NULL; | |
1184 | } | |
1185 | ||
1186 | /** | |
4d26e139 | 1187 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1188 | * @epdrv: early platform driver structure |
13977091 MD |
1189 | * @id: return true if id or above exists |
1190 | */ | |
1191 | static __init int early_platform_left(struct early_platform_driver *epdrv, | |
1192 | int id) | |
1193 | { | |
1194 | struct platform_device *pd; | |
1195 | ||
1196 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1197 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1198 | if (pd->id >= id) | |
1199 | return 1; | |
1200 | ||
1201 | return 0; | |
1202 | } | |
1203 | ||
1204 | /** | |
4d26e139 | 1205 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1206 | * @class_str: string to identify early platform driver class |
1207 | * @id: id to match against | |
1208 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1209 | */ | |
1210 | static int __init early_platform_driver_probe_id(char *class_str, | |
1211 | int id, | |
1212 | int nr_probe) | |
1213 | { | |
1214 | struct early_platform_driver *epdrv; | |
1215 | struct platform_device *match; | |
1216 | int match_id; | |
1217 | int n = 0; | |
1218 | int left = 0; | |
1219 | ||
1220 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1221 | /* only use drivers matching our class_str */ | |
1222 | if (strcmp(class_str, epdrv->class_str)) | |
1223 | continue; | |
1224 | ||
1225 | if (id == -2) { | |
1226 | match_id = epdrv->requested_id; | |
1227 | left = 1; | |
1228 | ||
1229 | } else { | |
1230 | match_id = id; | |
1231 | left += early_platform_left(epdrv, id); | |
1232 | ||
1233 | /* skip requested id */ | |
1234 | switch (epdrv->requested_id) { | |
1235 | case EARLY_PLATFORM_ID_ERROR: | |
1236 | case EARLY_PLATFORM_ID_UNSET: | |
1237 | break; | |
1238 | default: | |
1239 | if (epdrv->requested_id == id) | |
1240 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1241 | } | |
1242 | } | |
1243 | ||
1244 | switch (match_id) { | |
1245 | case EARLY_PLATFORM_ID_ERROR: | |
1246 | pr_warning("%s: unable to parse %s parameter\n", | |
1247 | class_str, epdrv->pdrv->driver.name); | |
1248 | /* fall-through */ | |
1249 | case EARLY_PLATFORM_ID_UNSET: | |
1250 | match = NULL; | |
1251 | break; | |
1252 | default: | |
1253 | match = early_platform_match(epdrv, match_id); | |
1254 | } | |
1255 | ||
1256 | if (match) { | |
a636ee7f PM |
1257 | /* |
1258 | * Set up a sensible init_name to enable | |
1259 | * dev_name() and others to be used before the | |
1260 | * rest of the driver core is initialized. | |
1261 | */ | |
06fe53be | 1262 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1263 | if (match->id != -1) |
bd05086b PM |
1264 | match->dev.init_name = |
1265 | kasprintf(GFP_KERNEL, "%s.%d", | |
1266 | match->name, | |
1267 | match->id); | |
a636ee7f | 1268 | else |
bd05086b PM |
1269 | match->dev.init_name = |
1270 | kasprintf(GFP_KERNEL, "%s", | |
1271 | match->name); | |
a636ee7f | 1272 | |
a636ee7f PM |
1273 | if (!match->dev.init_name) |
1274 | return -ENOMEM; | |
1275 | } | |
bd05086b | 1276 | |
13977091 MD |
1277 | if (epdrv->pdrv->probe(match)) |
1278 | pr_warning("%s: unable to probe %s early.\n", | |
1279 | class_str, match->name); | |
1280 | else | |
1281 | n++; | |
1282 | } | |
1283 | ||
1284 | if (n >= nr_probe) | |
1285 | break; | |
1286 | } | |
1287 | ||
1288 | if (left) | |
1289 | return n; | |
1290 | else | |
1291 | return -ENODEV; | |
1292 | } | |
1293 | ||
1294 | /** | |
4d26e139 | 1295 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1296 | * @class_str: string to identify early platform driver class |
1297 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1298 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1299 | * |
1300 | * Used by architecture code to probe registered early platform drivers | |
1301 | * within a certain class. For probe to happen a registered early platform | |
1302 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1303 | */ |
1304 | int __init early_platform_driver_probe(char *class_str, | |
1305 | int nr_probe, | |
1306 | int user_only) | |
1307 | { | |
1308 | int k, n, i; | |
1309 | ||
1310 | n = 0; | |
1311 | for (i = -2; n < nr_probe; i++) { | |
1312 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1313 | ||
1314 | if (k < 0) | |
1315 | break; | |
1316 | ||
1317 | n += k; | |
1318 | ||
1319 | if (user_only) | |
1320 | break; | |
1321 | } | |
1322 | ||
1323 | return n; | |
1324 | } | |
1325 | ||
1326 | /** | |
1327 | * early_platform_cleanup - clean up early platform code | |
1328 | */ | |
1329 | void __init early_platform_cleanup(void) | |
1330 | { | |
1331 | struct platform_device *pd, *pd2; | |
1332 | ||
1333 | /* clean up the devres list used to chain devices */ | |
1334 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1335 | dev.devres_head) { | |
1336 | list_del(&pd->dev.devres_head); | |
1337 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1338 | } | |
1339 | } | |
1340 |