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> |
689ae231 | 23 | #include <linux/idr.h> |
91e56878 | 24 | #include <linux/acpi.h> |
6fa3eb70 | 25 | #include <linux/time_log.h> |
1da177e4 | 26 | |
a1bdc7aa | 27 | #include "base.h" |
bed2b42d | 28 | #include "power/power.h" |
a1bdc7aa | 29 | |
689ae231 JD |
30 | /* For automatically allocated device IDs */ |
31 | static DEFINE_IDA(platform_devid_ida); | |
32 | ||
4a3ad20c GKH |
33 | #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \ |
34 | driver)) | |
00d3dcdd | 35 | |
1da177e4 | 36 | struct device platform_bus = { |
1e0b2cf9 | 37 | .init_name = "platform", |
1da177e4 | 38 | }; |
a96b2042 | 39 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 | 40 | |
a77ce816 KG |
41 | /** |
42 | * arch_setup_pdev_archdata - Allow manipulation of archdata before its used | |
7de636fa | 43 | * @pdev: platform device |
a77ce816 KG |
44 | * |
45 | * This is called before platform_device_add() such that any pdev_archdata may | |
46 | * be setup before the platform_notifier is called. So if a user needs to | |
47 | * manipulate any relevant information in the pdev_archdata they can do: | |
48 | * | |
b1d6d822 | 49 | * platform_device_alloc() |
0258e182 FP |
50 | * ... manipulate ... |
51 | * platform_device_add() | |
a77ce816 KG |
52 | * |
53 | * And if they don't care they can just call platform_device_register() and | |
54 | * everything will just work out. | |
55 | */ | |
56 | void __weak arch_setup_pdev_archdata(struct platform_device *pdev) | |
57 | { | |
58 | } | |
59 | ||
1da177e4 | 60 | /** |
4a3ad20c GKH |
61 | * platform_get_resource - get a resource for a device |
62 | * @dev: platform device | |
63 | * @type: resource type | |
64 | * @num: resource index | |
1da177e4 | 65 | */ |
4a3ad20c GKH |
66 | struct resource *platform_get_resource(struct platform_device *dev, |
67 | unsigned int type, unsigned int num) | |
1da177e4 LT |
68 | { |
69 | int i; | |
70 | ||
71 | for (i = 0; i < dev->num_resources; i++) { | |
72 | struct resource *r = &dev->resource[i]; | |
73 | ||
c9f66169 MD |
74 | if (type == resource_type(r) && num-- == 0) |
75 | return r; | |
1da177e4 LT |
76 | } |
77 | return NULL; | |
78 | } | |
a96b2042 | 79 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
80 | |
81 | /** | |
4a3ad20c GKH |
82 | * platform_get_irq - get an IRQ for a device |
83 | * @dev: platform device | |
84 | * @num: IRQ number index | |
1da177e4 LT |
85 | */ |
86 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
87 | { | |
5cf8f7db AL |
88 | #ifdef CONFIG_SPARC |
89 | /* sparc does not have irqs represented as IORESOURCE_IRQ resources */ | |
90 | if (!dev || num >= dev->archdata.num_irqs) | |
91 | return -ENXIO; | |
92 | return dev->archdata.irqs[num]; | |
93 | #else | |
1da177e4 LT |
94 | struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); |
95 | ||
305b3228 | 96 | return r ? r->start : -ENXIO; |
5cf8f7db | 97 | #endif |
1da177e4 | 98 | } |
a96b2042 | 99 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
100 | |
101 | /** | |
4a3ad20c GKH |
102 | * platform_get_resource_byname - get a resource for a device by name |
103 | * @dev: platform device | |
104 | * @type: resource type | |
105 | * @name: resource name | |
1da177e4 | 106 | */ |
4a3ad20c | 107 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
108 | unsigned int type, |
109 | const char *name) | |
1da177e4 LT |
110 | { |
111 | int i; | |
112 | ||
113 | for (i = 0; i < dev->num_resources; i++) { | |
114 | struct resource *r = &dev->resource[i]; | |
115 | ||
1b8cb929 PU |
116 | if (unlikely(!r->name)) |
117 | continue; | |
118 | ||
c9f66169 MD |
119 | if (type == resource_type(r) && !strcmp(r->name, name)) |
120 | return r; | |
1da177e4 LT |
121 | } |
122 | return NULL; | |
123 | } | |
a96b2042 | 124 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
125 | |
126 | /** | |
d6ff8551 | 127 | * platform_get_irq_byname - get an IRQ for a device by name |
4a3ad20c GKH |
128 | * @dev: platform device |
129 | * @name: IRQ name | |
1da177e4 | 130 | */ |
c0afe7ba | 131 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
1da177e4 | 132 | { |
4a3ad20c GKH |
133 | struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, |
134 | name); | |
1da177e4 | 135 | |
305b3228 | 136 | return r ? r->start : -ENXIO; |
1da177e4 | 137 | } |
a96b2042 | 138 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
139 | |
140 | /** | |
4a3ad20c GKH |
141 | * platform_add_devices - add a numbers of platform devices |
142 | * @devs: array of platform devices to add | |
143 | * @num: number of platform devices in array | |
1da177e4 LT |
144 | */ |
145 | int platform_add_devices(struct platform_device **devs, int num) | |
146 | { | |
147 | int i, ret = 0; | |
148 | ||
149 | for (i = 0; i < num; i++) { | |
150 | ret = platform_device_register(devs[i]); | |
151 | if (ret) { | |
152 | while (--i >= 0) | |
153 | platform_device_unregister(devs[i]); | |
154 | break; | |
155 | } | |
156 | } | |
157 | ||
158 | return ret; | |
159 | } | |
a96b2042 | 160 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 161 | |
37c12e74 RK |
162 | struct platform_object { |
163 | struct platform_device pdev; | |
164 | char name[1]; | |
165 | }; | |
166 | ||
1da177e4 | 167 | /** |
3c31f07a | 168 | * platform_device_put - destroy a platform device |
4a3ad20c | 169 | * @pdev: platform device to free |
37c12e74 | 170 | * |
4a3ad20c GKH |
171 | * Free all memory associated with a platform device. This function must |
172 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
173 | */ |
174 | void platform_device_put(struct platform_device *pdev) | |
175 | { | |
176 | if (pdev) | |
177 | put_device(&pdev->dev); | |
178 | } | |
179 | EXPORT_SYMBOL_GPL(platform_device_put); | |
180 | ||
181 | static void platform_device_release(struct device *dev) | |
182 | { | |
4a3ad20c GKH |
183 | struct platform_object *pa = container_of(dev, struct platform_object, |
184 | pdev.dev); | |
37c12e74 | 185 | |
7096d042 | 186 | of_device_node_put(&pa->pdev.dev); |
37c12e74 | 187 | kfree(pa->pdev.dev.platform_data); |
e710d7d5 | 188 | kfree(pa->pdev.mfd_cell); |
37c12e74 RK |
189 | kfree(pa->pdev.resource); |
190 | kfree(pa); | |
191 | } | |
192 | ||
193 | /** | |
3c31f07a | 194 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
195 | * @name: base name of the device we're adding |
196 | * @id: instance id | |
37c12e74 | 197 | * |
4a3ad20c GKH |
198 | * Create a platform device object which can have other objects attached |
199 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 200 | */ |
1359555e | 201 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
202 | { |
203 | struct platform_object *pa; | |
204 | ||
205 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); | |
206 | if (pa) { | |
207 | strcpy(pa->name, name); | |
208 | pa->pdev.name = pa->name; | |
209 | pa->pdev.id = id; | |
210 | device_initialize(&pa->pdev.dev); | |
211 | pa->pdev.dev.release = platform_device_release; | |
a77ce816 | 212 | arch_setup_pdev_archdata(&pa->pdev); |
37c12e74 RK |
213 | } |
214 | ||
93ce3061 | 215 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
216 | } |
217 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
218 | ||
219 | /** | |
3c31f07a | 220 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
221 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
222 | * @res: set of resources that needs to be allocated for the device | |
223 | * @num: number of resources | |
37c12e74 | 224 | * |
4a3ad20c GKH |
225 | * Add a copy of the resources to the platform device. The memory |
226 | * associated with the resources will be freed when the platform device is | |
227 | * released. | |
37c12e74 | 228 | */ |
4a3ad20c | 229 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 230 | const struct resource *res, unsigned int num) |
37c12e74 | 231 | { |
cea89623 | 232 | struct resource *r = NULL; |
37c12e74 | 233 | |
cea89623 UKK |
234 | if (res) { |
235 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); | |
236 | if (!r) | |
237 | return -ENOMEM; | |
37c12e74 | 238 | } |
cea89623 | 239 | |
4a03d6f7 | 240 | kfree(pdev->resource); |
cea89623 UKK |
241 | pdev->resource = r; |
242 | pdev->num_resources = num; | |
243 | return 0; | |
37c12e74 RK |
244 | } |
245 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
246 | ||
247 | /** | |
3c31f07a | 248 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
249 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
250 | * @data: platform specific data for this platform device | |
251 | * @size: size of platform specific data | |
37c12e74 | 252 | * |
4a3ad20c GKH |
253 | * Add a copy of platform specific data to the platform device's |
254 | * platform_data pointer. The memory associated with the platform data | |
255 | * will be freed when the platform device is released. | |
37c12e74 | 256 | */ |
4a3ad20c GKH |
257 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
258 | size_t size) | |
37c12e74 | 259 | { |
27a33f9e | 260 | void *d = NULL; |
5cfc64ce | 261 | |
27a33f9e UKK |
262 | if (data) { |
263 | d = kmemdup(data, size, GFP_KERNEL); | |
264 | if (!d) | |
265 | return -ENOMEM; | |
37c12e74 | 266 | } |
27a33f9e | 267 | |
251e031d | 268 | kfree(pdev->dev.platform_data); |
27a33f9e UKK |
269 | pdev->dev.platform_data = d; |
270 | return 0; | |
37c12e74 RK |
271 | } |
272 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
273 | ||
274 | /** | |
4a3ad20c GKH |
275 | * platform_device_add - add a platform device to device hierarchy |
276 | * @pdev: platform device we're adding | |
1da177e4 | 277 | * |
4a3ad20c GKH |
278 | * This is part 2 of platform_device_register(), though may be called |
279 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 280 | */ |
37c12e74 | 281 | int platform_device_add(struct platform_device *pdev) |
1da177e4 | 282 | { |
689ae231 | 283 | int i, ret; |
1da177e4 LT |
284 | |
285 | if (!pdev) | |
286 | return -EINVAL; | |
287 | ||
288 | if (!pdev->dev.parent) | |
289 | pdev->dev.parent = &platform_bus; | |
290 | ||
291 | pdev->dev.bus = &platform_bus_type; | |
292 | ||
689ae231 JD |
293 | switch (pdev->id) { |
294 | default: | |
1e0b2cf9 | 295 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
689ae231 JD |
296 | break; |
297 | case PLATFORM_DEVID_NONE: | |
acc0e90f | 298 | dev_set_name(&pdev->dev, "%s", pdev->name); |
689ae231 JD |
299 | break; |
300 | case PLATFORM_DEVID_AUTO: | |
301 | /* | |
302 | * Automatically allocated device ID. We mark it as such so | |
303 | * that we remember it must be freed, and we append a suffix | |
304 | * to avoid namespace collision with explicit IDs. | |
305 | */ | |
306 | ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL); | |
307 | if (ret < 0) | |
308 | goto err_out; | |
309 | pdev->id = ret; | |
310 | pdev->id_auto = true; | |
311 | dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); | |
312 | break; | |
313 | } | |
1da177e4 LT |
314 | |
315 | for (i = 0; i < pdev->num_resources; i++) { | |
316 | struct resource *p, *r = &pdev->resource[i]; | |
317 | ||
318 | if (r->name == NULL) | |
1e0b2cf9 | 319 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
320 | |
321 | p = r->parent; | |
322 | if (!p) { | |
c9f66169 | 323 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 324 | p = &iomem_resource; |
c9f66169 | 325 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
326 | p = &ioport_resource; |
327 | } | |
328 | ||
d960bb4d | 329 | if (p && insert_resource(p, r)) { |
0258e182 | 330 | dev_err(&pdev->dev, "failed to claim resource %d\n", i); |
1da177e4 LT |
331 | ret = -EBUSY; |
332 | goto failed; | |
333 | } | |
334 | } | |
335 | ||
336 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 337 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 338 | |
e3915532 | 339 | ret = device_add(&pdev->dev); |
1da177e4 LT |
340 | if (ret == 0) |
341 | return ret; | |
342 | ||
343 | failed: | |
689ae231 JD |
344 | if (pdev->id_auto) { |
345 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
346 | pdev->id = PLATFORM_DEVID_AUTO; | |
347 | } | |
348 | ||
c9f66169 MD |
349 | while (--i >= 0) { |
350 | struct resource *r = &pdev->resource[i]; | |
6ae99d59 | 351 | if (r->parent) |
c9f66169 MD |
352 | release_resource(r); |
353 | } | |
354 | ||
689ae231 | 355 | err_out: |
1da177e4 LT |
356 | return ret; |
357 | } | |
37c12e74 RK |
358 | EXPORT_SYMBOL_GPL(platform_device_add); |
359 | ||
360 | /** | |
4a3ad20c GKH |
361 | * platform_device_del - remove a platform-level device |
362 | * @pdev: platform device we're removing | |
1da177e4 | 363 | * |
4a3ad20c GKH |
364 | * Note that this function will also release all memory- and port-based |
365 | * resources owned by the device (@dev->resource). This function must | |
366 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 367 | */ |
93ce3061 | 368 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
369 | { |
370 | int i; | |
371 | ||
372 | if (pdev) { | |
dc4c15d4 JD |
373 | device_del(&pdev->dev); |
374 | ||
689ae231 JD |
375 | if (pdev->id_auto) { |
376 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
377 | pdev->id = PLATFORM_DEVID_AUTO; | |
378 | } | |
379 | ||
1da177e4 LT |
380 | for (i = 0; i < pdev->num_resources; i++) { |
381 | struct resource *r = &pdev->resource[i]; | |
6ae99d59 | 382 | if (r->parent) |
1da177e4 LT |
383 | release_resource(r); |
384 | } | |
1da177e4 LT |
385 | } |
386 | } | |
93ce3061 DT |
387 | EXPORT_SYMBOL_GPL(platform_device_del); |
388 | ||
389 | /** | |
4a3ad20c GKH |
390 | * platform_device_register - add a platform-level device |
391 | * @pdev: platform device we're adding | |
93ce3061 | 392 | */ |
4a3ad20c | 393 | int platform_device_register(struct platform_device *pdev) |
93ce3061 | 394 | { |
6fa3eb70 S |
395 | int ret; |
396 | TIME_LOG_START(); | |
93ce3061 | 397 | device_initialize(&pdev->dev); |
a77ce816 | 398 | arch_setup_pdev_archdata(pdev); |
6fa3eb70 S |
399 | ret = platform_device_add(pdev); |
400 | TIME_LOG_END("[pdev] %s\n", pdev->name); | |
401 | return ret; | |
93ce3061 | 402 | } |
a96b2042 | 403 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
404 | |
405 | /** | |
4a3ad20c GKH |
406 | * platform_device_unregister - unregister a platform-level device |
407 | * @pdev: platform device we're unregistering | |
93ce3061 | 408 | * |
4a3ad20c GKH |
409 | * Unregistration is done in 2 steps. First we release all resources |
410 | * and remove it from the subsystem, then we drop reference count by | |
411 | * calling platform_device_put(). | |
93ce3061 | 412 | */ |
4a3ad20c | 413 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
414 | { |
415 | platform_device_del(pdev); | |
416 | platform_device_put(pdev); | |
417 | } | |
a96b2042 | 418 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 419 | |
1da177e4 | 420 | /** |
01dcc60a | 421 | * platform_device_register_full - add a platform-level device with |
44f28bde | 422 | * resources and platform-specific data |
49a4ec18 | 423 | * |
01dcc60a | 424 | * @pdevinfo: data used to create device |
d8bf2540 | 425 | * |
f0eae0ed | 426 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 427 | */ |
01dcc60a | 428 | struct platform_device *platform_device_register_full( |
5a3072be | 429 | const struct platform_device_info *pdevinfo) |
d8bf2540 | 430 | { |
44f28bde | 431 | int ret = -ENOMEM; |
d8bf2540 | 432 | struct platform_device *pdev; |
d8bf2540 | 433 | |
01dcc60a | 434 | pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
44f28bde | 435 | if (!pdev) |
01dcc60a UKK |
436 | goto err_alloc; |
437 | ||
438 | pdev->dev.parent = pdevinfo->parent; | |
863f9f30 | 439 | ACPI_HANDLE_SET(&pdev->dev, pdevinfo->acpi_node.handle); |
01dcc60a UKK |
440 | |
441 | if (pdevinfo->dma_mask) { | |
442 | /* | |
443 | * This memory isn't freed when the device is put, | |
444 | * I don't have a nice idea for that though. Conceptually | |
445 | * dma_mask in struct device should not be a pointer. | |
446 | * See http://thread.gmane.org/gmane.linux.kernel.pci/9081 | |
447 | */ | |
448 | pdev->dev.dma_mask = | |
449 | kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); | |
450 | if (!pdev->dev.dma_mask) | |
451 | goto err; | |
452 | ||
453 | *pdev->dev.dma_mask = pdevinfo->dma_mask; | |
454 | pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; | |
455 | } | |
d8bf2540 | 456 | |
01dcc60a UKK |
457 | ret = platform_device_add_resources(pdev, |
458 | pdevinfo->res, pdevinfo->num_res); | |
807508c8 AV |
459 | if (ret) |
460 | goto err; | |
44f28bde | 461 | |
01dcc60a UKK |
462 | ret = platform_device_add_data(pdev, |
463 | pdevinfo->data, pdevinfo->size_data); | |
807508c8 AV |
464 | if (ret) |
465 | goto err; | |
d8bf2540 | 466 | |
44f28bde UKK |
467 | ret = platform_device_add(pdev); |
468 | if (ret) { | |
469 | err: | |
863f9f30 | 470 | ACPI_HANDLE_SET(&pdev->dev, NULL); |
01dcc60a UKK |
471 | kfree(pdev->dev.dma_mask); |
472 | ||
473 | err_alloc: | |
44f28bde UKK |
474 | platform_device_put(pdev); |
475 | return ERR_PTR(ret); | |
476 | } | |
d8bf2540 DES |
477 | |
478 | return pdev; | |
d8bf2540 | 479 | } |
01dcc60a | 480 | EXPORT_SYMBOL_GPL(platform_device_register_full); |
d8bf2540 | 481 | |
00d3dcdd RK |
482 | static int platform_drv_probe(struct device *_dev) |
483 | { | |
484 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
485 | struct platform_device *dev = to_platform_device(_dev); | |
94d76d5d | 486 | int ret; |
00d3dcdd | 487 | |
94d76d5d RW |
488 | if (ACPI_HANDLE(_dev)) |
489 | acpi_dev_pm_attach(_dev, true); | |
490 | ||
491 | ret = drv->probe(dev); | |
492 | if (ret && ACPI_HANDLE(_dev)) | |
493 | acpi_dev_pm_detach(_dev, true); | |
494 | ||
495 | return ret; | |
00d3dcdd RK |
496 | } |
497 | ||
c67334fb DB |
498 | static int platform_drv_probe_fail(struct device *_dev) |
499 | { | |
500 | return -ENXIO; | |
501 | } | |
502 | ||
00d3dcdd RK |
503 | static int platform_drv_remove(struct device *_dev) |
504 | { | |
505 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
506 | struct platform_device *dev = to_platform_device(_dev); | |
94d76d5d | 507 | int ret; |
00d3dcdd | 508 | |
94d76d5d RW |
509 | ret = drv->remove(dev); |
510 | if (ACPI_HANDLE(_dev)) | |
511 | acpi_dev_pm_detach(_dev, true); | |
512 | ||
513 | return ret; | |
00d3dcdd RK |
514 | } |
515 | ||
516 | static void platform_drv_shutdown(struct device *_dev) | |
517 | { | |
518 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
519 | struct platform_device *dev = to_platform_device(_dev); | |
520 | ||
521 | drv->shutdown(dev); | |
94d76d5d RW |
522 | if (ACPI_HANDLE(_dev)) |
523 | acpi_dev_pm_detach(_dev, true); | |
00d3dcdd RK |
524 | } |
525 | ||
00d3dcdd | 526 | /** |
3c31f07a | 527 | * platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 528 | * @drv: platform driver structure |
00d3dcdd RK |
529 | */ |
530 | int platform_driver_register(struct platform_driver *drv) | |
531 | { | |
532 | drv->driver.bus = &platform_bus_type; | |
533 | if (drv->probe) | |
534 | drv->driver.probe = platform_drv_probe; | |
535 | if (drv->remove) | |
536 | drv->driver.remove = platform_drv_remove; | |
537 | if (drv->shutdown) | |
538 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 539 | |
00d3dcdd RK |
540 | return driver_register(&drv->driver); |
541 | } | |
542 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
543 | ||
544 | /** | |
3c31f07a | 545 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 546 | * @drv: platform driver structure |
00d3dcdd RK |
547 | */ |
548 | void platform_driver_unregister(struct platform_driver *drv) | |
549 | { | |
550 | driver_unregister(&drv->driver); | |
551 | } | |
552 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
553 | ||
c67334fb DB |
554 | /** |
555 | * platform_driver_probe - register driver for non-hotpluggable device | |
556 | * @drv: platform driver structure | |
647c86d0 FP |
557 | * @probe: the driver probe routine, probably from an __init section, |
558 | * must not return -EPROBE_DEFER. | |
c67334fb DB |
559 | * |
560 | * Use this instead of platform_driver_register() when you know the device | |
561 | * is not hotpluggable and has already been registered, and you want to | |
562 | * remove its run-once probe() infrastructure from memory after the driver | |
563 | * has bound to the device. | |
564 | * | |
565 | * One typical use for this would be with drivers for controllers integrated | |
566 | * into system-on-chip processors, where the controller devices have been | |
567 | * configured as part of board setup. | |
568 | * | |
647c86d0 FP |
569 | * This is incompatible with deferred probing so probe() must not |
570 | * return -EPROBE_DEFER. | |
571 | * | |
c67334fb DB |
572 | * Returns zero if the driver registered and bound to a device, else returns |
573 | * a negative error code and with the driver not registered. | |
574 | */ | |
c63e0783 | 575 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
576 | int (*probe)(struct platform_device *)) |
577 | { | |
578 | int retval, code; | |
579 | ||
1a6f2a75 DT |
580 | /* make sure driver won't have bind/unbind attributes */ |
581 | drv->driver.suppress_bind_attrs = true; | |
582 | ||
c67334fb DB |
583 | /* temporary section violation during probe() */ |
584 | drv->probe = probe; | |
585 | retval = code = platform_driver_register(drv); | |
586 | ||
1a6f2a75 DT |
587 | /* |
588 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
589 | * the list of drivers in order to probe new devices. Check to see |
590 | * if the probe was successful, and make sure any forced probes of | |
591 | * new devices fail. | |
592 | */ | |
d79d3244 | 593 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb | 594 | drv->probe = NULL; |
e5dd1278 | 595 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
596 | retval = -ENODEV; |
597 | drv->driver.probe = platform_drv_probe_fail; | |
d79d3244 | 598 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
599 | |
600 | if (code != retval) | |
601 | platform_driver_unregister(drv); | |
602 | return retval; | |
603 | } | |
604 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 605 | |
ecdf6ceb DT |
606 | /** |
607 | * platform_create_bundle - register driver and create corresponding device | |
608 | * @driver: platform driver structure | |
609 | * @probe: the driver probe routine, probably from an __init section | |
610 | * @res: set of resources that needs to be allocated for the device | |
611 | * @n_res: number of resources | |
612 | * @data: platform specific data for this platform device | |
613 | * @size: size of platform specific data | |
614 | * | |
615 | * Use this in legacy-style modules that probe hardware directly and | |
616 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
617 | * |
618 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb DT |
619 | */ |
620 | struct platform_device * __init_or_module platform_create_bundle( | |
621 | struct platform_driver *driver, | |
622 | int (*probe)(struct platform_device *), | |
623 | struct resource *res, unsigned int n_res, | |
624 | const void *data, size_t size) | |
625 | { | |
626 | struct platform_device *pdev; | |
627 | int error; | |
628 | ||
629 | pdev = platform_device_alloc(driver->driver.name, -1); | |
630 | if (!pdev) { | |
631 | error = -ENOMEM; | |
632 | goto err_out; | |
633 | } | |
634 | ||
807508c8 AV |
635 | error = platform_device_add_resources(pdev, res, n_res); |
636 | if (error) | |
637 | goto err_pdev_put; | |
ecdf6ceb | 638 | |
807508c8 AV |
639 | error = platform_device_add_data(pdev, data, size); |
640 | if (error) | |
641 | goto err_pdev_put; | |
ecdf6ceb DT |
642 | |
643 | error = platform_device_add(pdev); | |
644 | if (error) | |
645 | goto err_pdev_put; | |
646 | ||
647 | error = platform_driver_probe(driver, probe); | |
648 | if (error) | |
649 | goto err_pdev_del; | |
650 | ||
651 | return pdev; | |
652 | ||
653 | err_pdev_del: | |
654 | platform_device_del(pdev); | |
655 | err_pdev_put: | |
656 | platform_device_put(pdev); | |
657 | err_out: | |
658 | return ERR_PTR(error); | |
659 | } | |
660 | EXPORT_SYMBOL_GPL(platform_create_bundle); | |
661 | ||
a0245f7a DB |
662 | /* modalias support enables more hands-off userspace setup: |
663 | * (a) environment variable lets new-style hotplug events work once system is | |
664 | * fully running: "modprobe $MODALIAS" | |
665 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
666 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
667 | */ | |
4a3ad20c GKH |
668 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
669 | char *buf) | |
a0245f7a DB |
670 | { |
671 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 672 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
673 | |
674 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
675 | } | |
676 | ||
677 | static struct device_attribute platform_dev_attrs[] = { | |
678 | __ATTR_RO(modalias), | |
679 | __ATTR_NULL, | |
680 | }; | |
681 | ||
7eff2e7a | 682 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
683 | { |
684 | struct platform_device *pdev = to_platform_device(dev); | |
eca39301 GL |
685 | int rc; |
686 | ||
687 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
0258e182 | 688 | rc = of_device_uevent_modalias(dev, env); |
eca39301 GL |
689 | if (rc != -ENODEV) |
690 | return rc; | |
a0245f7a | 691 | |
57fee4a5 | 692 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
0a26813c | 693 | pdev->name); |
a0245f7a DB |
694 | return 0; |
695 | } | |
696 | ||
57fee4a5 | 697 | static const struct platform_device_id *platform_match_id( |
831fad2f | 698 | const struct platform_device_id *id, |
57fee4a5 EM |
699 | struct platform_device *pdev) |
700 | { | |
701 | while (id->name[0]) { | |
702 | if (strcmp(pdev->name, id->name) == 0) { | |
703 | pdev->id_entry = id; | |
704 | return id; | |
705 | } | |
706 | id++; | |
707 | } | |
708 | return NULL; | |
709 | } | |
710 | ||
1da177e4 | 711 | /** |
4a3ad20c GKH |
712 | * platform_match - bind platform device to platform driver. |
713 | * @dev: device. | |
714 | * @drv: driver. | |
1da177e4 | 715 | * |
4a3ad20c GKH |
716 | * Platform device IDs are assumed to be encoded like this: |
717 | * "<name><instance>", where <name> is a short description of the type of | |
718 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
719 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
720 | * "<name>". So, extract the <name> from the platform_device structure, | |
721 | * and compare it against the name of the driver. Return whether they match | |
722 | * or not. | |
1da177e4 | 723 | */ |
4a3ad20c | 724 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 725 | { |
71b3e0c1 | 726 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
727 | struct platform_driver *pdrv = to_platform_driver(drv); |
728 | ||
05212157 GL |
729 | /* Attempt an OF style match first */ |
730 | if (of_driver_match_device(dev, drv)) | |
731 | return 1; | |
732 | ||
91e56878 MW |
733 | /* Then try ACPI style match */ |
734 | if (acpi_driver_match_device(dev, drv)) | |
735 | return 1; | |
736 | ||
05212157 | 737 | /* Then try to match against the id table */ |
57fee4a5 EM |
738 | if (pdrv->id_table) |
739 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 740 | |
57fee4a5 | 741 | /* fall-back to driver name match */ |
1e0b2cf9 | 742 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
743 | } |
744 | ||
25e18499 RW |
745 | #ifdef CONFIG_PM_SLEEP |
746 | ||
747 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 748 | { |
783ea7d4 MD |
749 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
750 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
751 | int ret = 0; |
752 | ||
783ea7d4 MD |
753 | if (dev->driver && pdrv->suspend) |
754 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
755 | |
756 | return ret; | |
757 | } | |
758 | ||
25e18499 | 759 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 760 | { |
783ea7d4 MD |
761 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
762 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
763 | int ret = 0; |
764 | ||
783ea7d4 MD |
765 | if (dev->driver && pdrv->resume) |
766 | ret = pdrv->resume(pdev); | |
9480e307 | 767 | |
1da177e4 LT |
768 | return ret; |
769 | } | |
770 | ||
69c9dd1e | 771 | #endif /* CONFIG_PM_SLEEP */ |
9d730229 | 772 | |
25e18499 RW |
773 | #ifdef CONFIG_SUSPEND |
774 | ||
69c9dd1e | 775 | int platform_pm_suspend(struct device *dev) |
25e18499 RW |
776 | { |
777 | struct device_driver *drv = dev->driver; | |
778 | int ret = 0; | |
779 | ||
adf09493 RW |
780 | if (!drv) |
781 | return 0; | |
782 | ||
783 | if (drv->pm) { | |
25e18499 RW |
784 | if (drv->pm->suspend) |
785 | ret = drv->pm->suspend(dev); | |
786 | } else { | |
787 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
788 | } | |
789 | ||
790 | return ret; | |
791 | } | |
792 | ||
69c9dd1e | 793 | int platform_pm_resume(struct device *dev) |
25e18499 RW |
794 | { |
795 | struct device_driver *drv = dev->driver; | |
796 | int ret = 0; | |
797 | ||
adf09493 RW |
798 | if (!drv) |
799 | return 0; | |
800 | ||
801 | if (drv->pm) { | |
25e18499 RW |
802 | if (drv->pm->resume) |
803 | ret = drv->pm->resume(dev); | |
804 | } else { | |
805 | ret = platform_legacy_resume(dev); | |
806 | } | |
807 | ||
808 | return ret; | |
809 | } | |
810 | ||
69c9dd1e | 811 | #endif /* CONFIG_SUSPEND */ |
25e18499 | 812 | |
1f112cee | 813 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 | 814 | |
69c9dd1e | 815 | int platform_pm_freeze(struct device *dev) |
25e18499 RW |
816 | { |
817 | struct device_driver *drv = dev->driver; | |
818 | int ret = 0; | |
819 | ||
820 | if (!drv) | |
821 | return 0; | |
822 | ||
823 | if (drv->pm) { | |
824 | if (drv->pm->freeze) | |
825 | ret = drv->pm->freeze(dev); | |
826 | } else { | |
827 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
828 | } | |
829 | ||
830 | return ret; | |
831 | } | |
832 | ||
69c9dd1e | 833 | int platform_pm_thaw(struct device *dev) |
25e18499 RW |
834 | { |
835 | struct device_driver *drv = dev->driver; | |
836 | int ret = 0; | |
837 | ||
adf09493 RW |
838 | if (!drv) |
839 | return 0; | |
840 | ||
841 | if (drv->pm) { | |
25e18499 RW |
842 | if (drv->pm->thaw) |
843 | ret = drv->pm->thaw(dev); | |
844 | } else { | |
845 | ret = platform_legacy_resume(dev); | |
846 | } | |
847 | ||
848 | return ret; | |
849 | } | |
850 | ||
69c9dd1e | 851 | int platform_pm_poweroff(struct device *dev) |
25e18499 RW |
852 | { |
853 | struct device_driver *drv = dev->driver; | |
854 | int ret = 0; | |
855 | ||
adf09493 RW |
856 | if (!drv) |
857 | return 0; | |
858 | ||
859 | if (drv->pm) { | |
25e18499 RW |
860 | if (drv->pm->poweroff) |
861 | ret = drv->pm->poweroff(dev); | |
862 | } else { | |
863 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
864 | } | |
865 | ||
866 | return ret; | |
867 | } | |
868 | ||
69c9dd1e | 869 | int platform_pm_restore(struct device *dev) |
25e18499 RW |
870 | { |
871 | struct device_driver *drv = dev->driver; | |
872 | int ret = 0; | |
873 | ||
adf09493 RW |
874 | if (!drv) |
875 | return 0; | |
876 | ||
877 | if (drv->pm) { | |
25e18499 RW |
878 | if (drv->pm->restore) |
879 | ret = drv->pm->restore(dev); | |
880 | } else { | |
881 | ret = platform_legacy_resume(dev); | |
882 | } | |
883 | ||
884 | return ret; | |
885 | } | |
886 | ||
69c9dd1e | 887 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 888 | |
d9ab7716 | 889 | static const struct dev_pm_ops platform_dev_pm_ops = { |
8b313a38 RW |
890 | .runtime_suspend = pm_generic_runtime_suspend, |
891 | .runtime_resume = pm_generic_runtime_resume, | |
892 | .runtime_idle = pm_generic_runtime_idle, | |
69c9dd1e | 893 | USE_PLATFORM_PM_SLEEP_OPS |
25e18499 RW |
894 | }; |
895 | ||
1da177e4 LT |
896 | struct bus_type platform_bus_type = { |
897 | .name = "platform", | |
a0245f7a | 898 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 899 | .match = platform_match, |
a0245f7a | 900 | .uevent = platform_uevent, |
9d730229 | 901 | .pm = &platform_dev_pm_ops, |
1da177e4 | 902 | }; |
a96b2042 | 903 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
904 | |
905 | int __init platform_bus_init(void) | |
906 | { | |
fbfb1445 CH |
907 | int error; |
908 | ||
13977091 MD |
909 | early_platform_cleanup(); |
910 | ||
fbfb1445 CH |
911 | error = device_register(&platform_bus); |
912 | if (error) | |
913 | return error; | |
914 | error = bus_register(&platform_bus_type); | |
915 | if (error) | |
916 | device_unregister(&platform_bus); | |
917 | return error; | |
1da177e4 LT |
918 | } |
919 | ||
920 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
921 | u64 dma_get_required_mask(struct device *dev) | |
922 | { | |
923 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
924 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
925 | u64 mask; | |
926 | ||
927 | if (!high_totalram) { | |
928 | /* convert to mask just covering totalram */ | |
929 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
930 | low_totalram += low_totalram - 1; | |
931 | mask = low_totalram; | |
932 | } else { | |
933 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
934 | high_totalram += high_totalram - 1; | |
935 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
936 | } | |
e88a0c2c | 937 | return mask; |
1da177e4 LT |
938 | } |
939 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
940 | #endif | |
13977091 MD |
941 | |
942 | static __initdata LIST_HEAD(early_platform_driver_list); | |
943 | static __initdata LIST_HEAD(early_platform_device_list); | |
944 | ||
945 | /** | |
4d26e139 | 946 | * early_platform_driver_register - register early platform driver |
d86c1302 | 947 | * @epdrv: early_platform driver structure |
13977091 | 948 | * @buf: string passed from early_param() |
4d26e139 MD |
949 | * |
950 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
951 | */ |
952 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
953 | char *buf) | |
954 | { | |
c60e0504 | 955 | char *tmp; |
13977091 MD |
956 | int n; |
957 | ||
958 | /* Simply add the driver to the end of the global list. | |
959 | * Drivers will by default be put on the list in compiled-in order. | |
960 | */ | |
961 | if (!epdrv->list.next) { | |
962 | INIT_LIST_HEAD(&epdrv->list); | |
963 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
964 | } | |
965 | ||
966 | /* If the user has specified device then make sure the driver | |
967 | * gets prioritized. The driver of the last device specified on | |
968 | * command line will be put first on the list. | |
969 | */ | |
970 | n = strlen(epdrv->pdrv->driver.name); | |
971 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
972 | list_move(&epdrv->list, &early_platform_driver_list); | |
973 | ||
c60e0504 MD |
974 | /* Allow passing parameters after device name */ |
975 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 976 | epdrv->requested_id = -1; |
c60e0504 MD |
977 | else { |
978 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
979 | &tmp, 10); | |
980 | ||
981 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
982 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
983 | n = 0; | |
984 | } else | |
985 | n += strcspn(&buf[n + 1], ",") + 1; | |
986 | } | |
987 | ||
988 | if (buf[n] == ',') | |
989 | n++; | |
990 | ||
991 | if (epdrv->bufsize) { | |
992 | memcpy(epdrv->buffer, &buf[n], | |
993 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
994 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
995 | } | |
13977091 MD |
996 | } |
997 | ||
998 | return 0; | |
999 | } | |
1000 | ||
1001 | /** | |
4d26e139 | 1002 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
1003 | * @devs: array of early platform devices to add |
1004 | * @num: number of early platform devices in array | |
4d26e139 MD |
1005 | * |
1006 | * Used by early architecture code to register early platform devices and | |
1007 | * their platform data. | |
13977091 MD |
1008 | */ |
1009 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1010 | { | |
1011 | struct device *dev; | |
1012 | int i; | |
1013 | ||
1014 | /* simply add the devices to list */ | |
1015 | for (i = 0; i < num; i++) { | |
1016 | dev = &devs[i]->dev; | |
1017 | ||
1018 | if (!dev->devres_head.next) { | |
bed2b42d | 1019 | pm_runtime_early_init(dev); |
13977091 MD |
1020 | INIT_LIST_HEAD(&dev->devres_head); |
1021 | list_add_tail(&dev->devres_head, | |
1022 | &early_platform_device_list); | |
1023 | } | |
1024 | } | |
1025 | } | |
1026 | ||
1027 | /** | |
4d26e139 | 1028 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 1029 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
1030 | * |
1031 | * Used by architecture code to register all early platform drivers | |
1032 | * for a certain class. If omitted then only early platform drivers | |
1033 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
1034 | */ |
1035 | void __init early_platform_driver_register_all(char *class_str) | |
1036 | { | |
1037 | /* The "class_str" parameter may or may not be present on the kernel | |
1038 | * command line. If it is present then there may be more than one | |
1039 | * matching parameter. | |
1040 | * | |
1041 | * Since we register our early platform drivers using early_param() | |
1042 | * we need to make sure that they also get registered in the case | |
1043 | * when the parameter is missing from the kernel command line. | |
1044 | * | |
1045 | * We use parse_early_options() to make sure the early_param() gets | |
1046 | * called at least once. The early_param() may be called more than | |
1047 | * once since the name of the preferred device may be specified on | |
1048 | * the kernel command line. early_platform_driver_register() handles | |
1049 | * this case for us. | |
1050 | */ | |
1051 | parse_early_options(class_str); | |
1052 | } | |
1053 | ||
1054 | /** | |
4d26e139 | 1055 | * early_platform_match - find early platform device matching driver |
d86c1302 | 1056 | * @epdrv: early platform driver structure |
13977091 MD |
1057 | * @id: id to match against |
1058 | */ | |
1059 | static __init struct platform_device * | |
1060 | early_platform_match(struct early_platform_driver *epdrv, int id) | |
1061 | { | |
1062 | struct platform_device *pd; | |
1063 | ||
1064 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1065 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1066 | if (pd->id == id) | |
1067 | return pd; | |
1068 | ||
1069 | return NULL; | |
1070 | } | |
1071 | ||
1072 | /** | |
4d26e139 | 1073 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1074 | * @epdrv: early platform driver structure |
13977091 MD |
1075 | * @id: return true if id or above exists |
1076 | */ | |
1077 | static __init int early_platform_left(struct early_platform_driver *epdrv, | |
1078 | int id) | |
1079 | { | |
1080 | struct platform_device *pd; | |
1081 | ||
1082 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1083 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1084 | if (pd->id >= id) | |
1085 | return 1; | |
1086 | ||
1087 | return 0; | |
1088 | } | |
1089 | ||
1090 | /** | |
4d26e139 | 1091 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1092 | * @class_str: string to identify early platform driver class |
1093 | * @id: id to match against | |
1094 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1095 | */ | |
1096 | static int __init early_platform_driver_probe_id(char *class_str, | |
1097 | int id, | |
1098 | int nr_probe) | |
1099 | { | |
1100 | struct early_platform_driver *epdrv; | |
1101 | struct platform_device *match; | |
1102 | int match_id; | |
1103 | int n = 0; | |
1104 | int left = 0; | |
1105 | ||
1106 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1107 | /* only use drivers matching our class_str */ | |
1108 | if (strcmp(class_str, epdrv->class_str)) | |
1109 | continue; | |
1110 | ||
1111 | if (id == -2) { | |
1112 | match_id = epdrv->requested_id; | |
1113 | left = 1; | |
1114 | ||
1115 | } else { | |
1116 | match_id = id; | |
1117 | left += early_platform_left(epdrv, id); | |
1118 | ||
1119 | /* skip requested id */ | |
1120 | switch (epdrv->requested_id) { | |
1121 | case EARLY_PLATFORM_ID_ERROR: | |
1122 | case EARLY_PLATFORM_ID_UNSET: | |
1123 | break; | |
1124 | default: | |
1125 | if (epdrv->requested_id == id) | |
1126 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1127 | } | |
1128 | } | |
1129 | ||
1130 | switch (match_id) { | |
1131 | case EARLY_PLATFORM_ID_ERROR: | |
0258e182 FP |
1132 | pr_warn("%s: unable to parse %s parameter\n", |
1133 | class_str, epdrv->pdrv->driver.name); | |
13977091 MD |
1134 | /* fall-through */ |
1135 | case EARLY_PLATFORM_ID_UNSET: | |
1136 | match = NULL; | |
1137 | break; | |
1138 | default: | |
1139 | match = early_platform_match(epdrv, match_id); | |
1140 | } | |
1141 | ||
1142 | if (match) { | |
a636ee7f PM |
1143 | /* |
1144 | * Set up a sensible init_name to enable | |
1145 | * dev_name() and others to be used before the | |
1146 | * rest of the driver core is initialized. | |
1147 | */ | |
06fe53be | 1148 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1149 | if (match->id != -1) |
bd05086b PM |
1150 | match->dev.init_name = |
1151 | kasprintf(GFP_KERNEL, "%s.%d", | |
1152 | match->name, | |
1153 | match->id); | |
a636ee7f | 1154 | else |
bd05086b PM |
1155 | match->dev.init_name = |
1156 | kasprintf(GFP_KERNEL, "%s", | |
1157 | match->name); | |
a636ee7f | 1158 | |
a636ee7f PM |
1159 | if (!match->dev.init_name) |
1160 | return -ENOMEM; | |
1161 | } | |
bd05086b | 1162 | |
13977091 | 1163 | if (epdrv->pdrv->probe(match)) |
0258e182 FP |
1164 | pr_warn("%s: unable to probe %s early.\n", |
1165 | class_str, match->name); | |
13977091 MD |
1166 | else |
1167 | n++; | |
1168 | } | |
1169 | ||
1170 | if (n >= nr_probe) | |
1171 | break; | |
1172 | } | |
1173 | ||
1174 | if (left) | |
1175 | return n; | |
1176 | else | |
1177 | return -ENODEV; | |
1178 | } | |
1179 | ||
1180 | /** | |
4d26e139 | 1181 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1182 | * @class_str: string to identify early platform driver class |
1183 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1184 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1185 | * |
1186 | * Used by architecture code to probe registered early platform drivers | |
1187 | * within a certain class. For probe to happen a registered early platform | |
1188 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1189 | */ |
1190 | int __init early_platform_driver_probe(char *class_str, | |
1191 | int nr_probe, | |
1192 | int user_only) | |
1193 | { | |
1194 | int k, n, i; | |
1195 | ||
1196 | n = 0; | |
1197 | for (i = -2; n < nr_probe; i++) { | |
1198 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1199 | ||
1200 | if (k < 0) | |
1201 | break; | |
1202 | ||
1203 | n += k; | |
1204 | ||
1205 | if (user_only) | |
1206 | break; | |
1207 | } | |
1208 | ||
1209 | return n; | |
1210 | } | |
1211 | ||
1212 | /** | |
1213 | * early_platform_cleanup - clean up early platform code | |
1214 | */ | |
1215 | void __init early_platform_cleanup(void) | |
1216 | { | |
1217 | struct platform_device *pd, *pd2; | |
1218 | ||
1219 | /* clean up the devres list used to chain devices */ | |
1220 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1221 | dev.devres_head) { | |
1222 | list_del(&pd->dev.devres_head); | |
1223 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1224 | } | |
1225 | } | |
1226 |