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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * platform.c - platform 'pseudo' bus for legacy devices | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * Please see Documentation/driver-model/platform.txt for more | |
10 | * information. | |
11 | */ | |
12 | ||
daa41226 | 13 | #include <linux/string.h> |
d052d1be | 14 | #include <linux/platform_device.h> |
05212157 | 15 | #include <linux/of_device.h> |
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <linux/init.h> | |
18 | #include <linux/dma-mapping.h> | |
19 | #include <linux/bootmem.h> | |
20 | #include <linux/err.h> | |
4e57b681 | 21 | #include <linux/slab.h> |
9d730229 | 22 | #include <linux/pm_runtime.h> |
689ae231 | 23 | #include <linux/idr.h> |
91e56878 | 24 | #include <linux/acpi.h> |
1da177e4 | 25 | |
a1bdc7aa | 26 | #include "base.h" |
bed2b42d | 27 | #include "power/power.h" |
a1bdc7aa | 28 | |
689ae231 JD |
29 | /* For automatically allocated device IDs */ |
30 | static DEFINE_IDA(platform_devid_ida); | |
31 | ||
4a3ad20c GKH |
32 | #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \ |
33 | driver)) | |
00d3dcdd | 34 | |
1da177e4 | 35 | struct device platform_bus = { |
1e0b2cf9 | 36 | .init_name = "platform", |
1da177e4 | 37 | }; |
a96b2042 | 38 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 | 39 | |
a77ce816 KG |
40 | /** |
41 | * arch_setup_pdev_archdata - Allow manipulation of archdata before its used | |
7de636fa | 42 | * @pdev: platform device |
a77ce816 KG |
43 | * |
44 | * This is called before platform_device_add() such that any pdev_archdata may | |
45 | * be setup before the platform_notifier is called. So if a user needs to | |
46 | * manipulate any relevant information in the pdev_archdata they can do: | |
47 | * | |
b1d6d822 | 48 | * platform_device_alloc() |
0258e182 FP |
49 | * ... manipulate ... |
50 | * platform_device_add() | |
a77ce816 KG |
51 | * |
52 | * And if they don't care they can just call platform_device_register() and | |
53 | * everything will just work out. | |
54 | */ | |
55 | void __weak arch_setup_pdev_archdata(struct platform_device *pdev) | |
56 | { | |
57 | } | |
58 | ||
1da177e4 | 59 | /** |
4a3ad20c GKH |
60 | * platform_get_resource - get a resource for a device |
61 | * @dev: platform device | |
62 | * @type: resource type | |
63 | * @num: resource index | |
1da177e4 | 64 | */ |
4a3ad20c GKH |
65 | struct resource *platform_get_resource(struct platform_device *dev, |
66 | unsigned int type, unsigned int num) | |
1da177e4 LT |
67 | { |
68 | int i; | |
69 | ||
70 | for (i = 0; i < dev->num_resources; i++) { | |
71 | struct resource *r = &dev->resource[i]; | |
72 | ||
c9f66169 MD |
73 | if (type == resource_type(r) && num-- == 0) |
74 | return r; | |
1da177e4 LT |
75 | } |
76 | return NULL; | |
77 | } | |
a96b2042 | 78 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
79 | |
80 | /** | |
4a3ad20c GKH |
81 | * platform_get_irq - get an IRQ for a device |
82 | * @dev: platform device | |
83 | * @num: IRQ number index | |
1da177e4 LT |
84 | */ |
85 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
86 | { | |
5cf8f7db AL |
87 | #ifdef CONFIG_SPARC |
88 | /* sparc does not have irqs represented as IORESOURCE_IRQ resources */ | |
89 | if (!dev || num >= dev->archdata.num_irqs) | |
90 | return -ENXIO; | |
91 | return dev->archdata.irqs[num]; | |
92 | #else | |
1da177e4 LT |
93 | struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); |
94 | ||
305b3228 | 95 | return r ? r->start : -ENXIO; |
5cf8f7db | 96 | #endif |
1da177e4 | 97 | } |
a96b2042 | 98 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
99 | |
100 | /** | |
4a3ad20c GKH |
101 | * platform_get_resource_byname - get a resource for a device by name |
102 | * @dev: platform device | |
103 | * @type: resource type | |
104 | * @name: resource name | |
1da177e4 | 105 | */ |
4a3ad20c | 106 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
107 | unsigned int type, |
108 | const char *name) | |
1da177e4 LT |
109 | { |
110 | int i; | |
111 | ||
112 | for (i = 0; i < dev->num_resources; i++) { | |
113 | struct resource *r = &dev->resource[i]; | |
114 | ||
1b8cb929 PU |
115 | if (unlikely(!r->name)) |
116 | continue; | |
117 | ||
c9f66169 MD |
118 | if (type == resource_type(r) && !strcmp(r->name, name)) |
119 | return r; | |
1da177e4 LT |
120 | } |
121 | return NULL; | |
122 | } | |
a96b2042 | 123 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
124 | |
125 | /** | |
d6ff8551 | 126 | * platform_get_irq_byname - get an IRQ for a device by name |
4a3ad20c GKH |
127 | * @dev: platform device |
128 | * @name: IRQ name | |
1da177e4 | 129 | */ |
c0afe7ba | 130 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
1da177e4 | 131 | { |
4a3ad20c GKH |
132 | struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, |
133 | name); | |
1da177e4 | 134 | |
305b3228 | 135 | return r ? r->start : -ENXIO; |
1da177e4 | 136 | } |
a96b2042 | 137 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
138 | |
139 | /** | |
4a3ad20c GKH |
140 | * platform_add_devices - add a numbers of platform devices |
141 | * @devs: array of platform devices to add | |
142 | * @num: number of platform devices in array | |
1da177e4 LT |
143 | */ |
144 | int platform_add_devices(struct platform_device **devs, int num) | |
145 | { | |
146 | int i, ret = 0; | |
147 | ||
148 | for (i = 0; i < num; i++) { | |
149 | ret = platform_device_register(devs[i]); | |
150 | if (ret) { | |
151 | while (--i >= 0) | |
152 | platform_device_unregister(devs[i]); | |
153 | break; | |
154 | } | |
155 | } | |
156 | ||
157 | return ret; | |
158 | } | |
a96b2042 | 159 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 160 | |
37c12e74 RK |
161 | struct platform_object { |
162 | struct platform_device pdev; | |
163 | char name[1]; | |
164 | }; | |
165 | ||
1da177e4 | 166 | /** |
3c31f07a | 167 | * platform_device_put - destroy a platform device |
4a3ad20c | 168 | * @pdev: platform device to free |
37c12e74 | 169 | * |
4a3ad20c GKH |
170 | * Free all memory associated with a platform device. This function must |
171 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
172 | */ |
173 | void platform_device_put(struct platform_device *pdev) | |
174 | { | |
175 | if (pdev) | |
176 | put_device(&pdev->dev); | |
177 | } | |
178 | EXPORT_SYMBOL_GPL(platform_device_put); | |
179 | ||
180 | static void platform_device_release(struct device *dev) | |
181 | { | |
4a3ad20c GKH |
182 | struct platform_object *pa = container_of(dev, struct platform_object, |
183 | pdev.dev); | |
37c12e74 | 184 | |
7096d042 | 185 | of_device_node_put(&pa->pdev.dev); |
37c12e74 | 186 | kfree(pa->pdev.dev.platform_data); |
e710d7d5 | 187 | kfree(pa->pdev.mfd_cell); |
37c12e74 RK |
188 | kfree(pa->pdev.resource); |
189 | kfree(pa); | |
190 | } | |
191 | ||
192 | /** | |
3c31f07a | 193 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
194 | * @name: base name of the device we're adding |
195 | * @id: instance id | |
37c12e74 | 196 | * |
4a3ad20c GKH |
197 | * Create a platform device object which can have other objects attached |
198 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 199 | */ |
1359555e | 200 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
201 | { |
202 | struct platform_object *pa; | |
203 | ||
204 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); | |
205 | if (pa) { | |
206 | strcpy(pa->name, name); | |
207 | pa->pdev.name = pa->name; | |
208 | pa->pdev.id = id; | |
209 | device_initialize(&pa->pdev.dev); | |
210 | pa->pdev.dev.release = platform_device_release; | |
a77ce816 | 211 | arch_setup_pdev_archdata(&pa->pdev); |
37c12e74 RK |
212 | } |
213 | ||
93ce3061 | 214 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
215 | } |
216 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
217 | ||
218 | /** | |
3c31f07a | 219 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
220 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
221 | * @res: set of resources that needs to be allocated for the device | |
222 | * @num: number of resources | |
37c12e74 | 223 | * |
4a3ad20c GKH |
224 | * Add a copy of the resources to the platform device. The memory |
225 | * associated with the resources will be freed when the platform device is | |
226 | * released. | |
37c12e74 | 227 | */ |
4a3ad20c | 228 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 229 | const struct resource *res, unsigned int num) |
37c12e74 | 230 | { |
cea89623 | 231 | struct resource *r = NULL; |
37c12e74 | 232 | |
cea89623 UKK |
233 | if (res) { |
234 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); | |
235 | if (!r) | |
236 | return -ENOMEM; | |
37c12e74 | 237 | } |
cea89623 | 238 | |
4a03d6f7 | 239 | kfree(pdev->resource); |
cea89623 UKK |
240 | pdev->resource = r; |
241 | pdev->num_resources = num; | |
242 | return 0; | |
37c12e74 RK |
243 | } |
244 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
245 | ||
246 | /** | |
3c31f07a | 247 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
248 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
249 | * @data: platform specific data for this platform device | |
250 | * @size: size of platform specific data | |
37c12e74 | 251 | * |
4a3ad20c GKH |
252 | * Add a copy of platform specific data to the platform device's |
253 | * platform_data pointer. The memory associated with the platform data | |
254 | * will be freed when the platform device is released. | |
37c12e74 | 255 | */ |
4a3ad20c GKH |
256 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
257 | size_t size) | |
37c12e74 | 258 | { |
27a33f9e | 259 | void *d = NULL; |
5cfc64ce | 260 | |
27a33f9e UKK |
261 | if (data) { |
262 | d = kmemdup(data, size, GFP_KERNEL); | |
263 | if (!d) | |
264 | return -ENOMEM; | |
37c12e74 | 265 | } |
27a33f9e | 266 | |
251e031d | 267 | kfree(pdev->dev.platform_data); |
27a33f9e UKK |
268 | pdev->dev.platform_data = d; |
269 | return 0; | |
37c12e74 RK |
270 | } |
271 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
272 | ||
273 | /** | |
4a3ad20c GKH |
274 | * platform_device_add - add a platform device to device hierarchy |
275 | * @pdev: platform device we're adding | |
1da177e4 | 276 | * |
4a3ad20c GKH |
277 | * This is part 2 of platform_device_register(), though may be called |
278 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 279 | */ |
37c12e74 | 280 | int platform_device_add(struct platform_device *pdev) |
1da177e4 | 281 | { |
689ae231 | 282 | int i, ret; |
1da177e4 LT |
283 | |
284 | if (!pdev) | |
285 | return -EINVAL; | |
286 | ||
287 | if (!pdev->dev.parent) | |
288 | pdev->dev.parent = &platform_bus; | |
289 | ||
290 | pdev->dev.bus = &platform_bus_type; | |
291 | ||
689ae231 JD |
292 | switch (pdev->id) { |
293 | default: | |
1e0b2cf9 | 294 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
689ae231 JD |
295 | break; |
296 | case PLATFORM_DEVID_NONE: | |
acc0e90f | 297 | dev_set_name(&pdev->dev, "%s", pdev->name); |
689ae231 JD |
298 | break; |
299 | case PLATFORM_DEVID_AUTO: | |
300 | /* | |
301 | * Automatically allocated device ID. We mark it as such so | |
302 | * that we remember it must be freed, and we append a suffix | |
303 | * to avoid namespace collision with explicit IDs. | |
304 | */ | |
305 | ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL); | |
306 | if (ret < 0) | |
307 | goto err_out; | |
308 | pdev->id = ret; | |
309 | pdev->id_auto = true; | |
310 | dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); | |
311 | break; | |
312 | } | |
1da177e4 LT |
313 | |
314 | for (i = 0; i < pdev->num_resources; i++) { | |
315 | struct resource *p, *r = &pdev->resource[i]; | |
316 | ||
317 | if (r->name == NULL) | |
1e0b2cf9 | 318 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
319 | |
320 | p = r->parent; | |
321 | if (!p) { | |
c9f66169 | 322 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 323 | p = &iomem_resource; |
c9f66169 | 324 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
325 | p = &ioport_resource; |
326 | } | |
327 | ||
d960bb4d | 328 | if (p && insert_resource(p, r)) { |
0258e182 | 329 | dev_err(&pdev->dev, "failed to claim resource %d\n", i); |
1da177e4 LT |
330 | ret = -EBUSY; |
331 | goto failed; | |
332 | } | |
333 | } | |
334 | ||
335 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 336 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 337 | |
e3915532 | 338 | ret = device_add(&pdev->dev); |
1da177e4 LT |
339 | if (ret == 0) |
340 | return ret; | |
341 | ||
342 | failed: | |
689ae231 JD |
343 | if (pdev->id_auto) { |
344 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
345 | pdev->id = PLATFORM_DEVID_AUTO; | |
346 | } | |
347 | ||
c9f66169 MD |
348 | while (--i >= 0) { |
349 | struct resource *r = &pdev->resource[i]; | |
350 | unsigned long type = resource_type(r); | |
351 | ||
352 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
353 | release_resource(r); | |
354 | } | |
355 | ||
689ae231 | 356 | err_out: |
1da177e4 LT |
357 | return ret; |
358 | } | |
37c12e74 RK |
359 | EXPORT_SYMBOL_GPL(platform_device_add); |
360 | ||
361 | /** | |
4a3ad20c GKH |
362 | * platform_device_del - remove a platform-level device |
363 | * @pdev: platform device we're removing | |
1da177e4 | 364 | * |
4a3ad20c GKH |
365 | * Note that this function will also release all memory- and port-based |
366 | * resources owned by the device (@dev->resource). This function must | |
367 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 368 | */ |
93ce3061 | 369 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
370 | { |
371 | int i; | |
372 | ||
373 | if (pdev) { | |
dc4c15d4 JD |
374 | device_del(&pdev->dev); |
375 | ||
689ae231 JD |
376 | if (pdev->id_auto) { |
377 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
378 | pdev->id = PLATFORM_DEVID_AUTO; | |
379 | } | |
380 | ||
1da177e4 LT |
381 | for (i = 0; i < pdev->num_resources; i++) { |
382 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
383 | unsigned long type = resource_type(r); |
384 | ||
385 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
386 | release_resource(r); |
387 | } | |
1da177e4 LT |
388 | } |
389 | } | |
93ce3061 DT |
390 | EXPORT_SYMBOL_GPL(platform_device_del); |
391 | ||
392 | /** | |
4a3ad20c GKH |
393 | * platform_device_register - add a platform-level device |
394 | * @pdev: platform device we're adding | |
93ce3061 | 395 | */ |
4a3ad20c | 396 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
397 | { |
398 | device_initialize(&pdev->dev); | |
a77ce816 | 399 | arch_setup_pdev_archdata(pdev); |
93ce3061 DT |
400 | return platform_device_add(pdev); |
401 | } | |
a96b2042 | 402 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
403 | |
404 | /** | |
4a3ad20c GKH |
405 | * platform_device_unregister - unregister a platform-level device |
406 | * @pdev: platform device we're unregistering | |
93ce3061 | 407 | * |
4a3ad20c GKH |
408 | * Unregistration is done in 2 steps. First we release all resources |
409 | * and remove it from the subsystem, then we drop reference count by | |
410 | * calling platform_device_put(). | |
93ce3061 | 411 | */ |
4a3ad20c | 412 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
413 | { |
414 | platform_device_del(pdev); | |
415 | platform_device_put(pdev); | |
416 | } | |
a96b2042 | 417 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 418 | |
1da177e4 | 419 | /** |
01dcc60a | 420 | * platform_device_register_full - add a platform-level device with |
44f28bde | 421 | * resources and platform-specific data |
49a4ec18 | 422 | * |
01dcc60a | 423 | * @pdevinfo: data used to create device |
d8bf2540 | 424 | * |
f0eae0ed | 425 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 426 | */ |
01dcc60a | 427 | struct platform_device *platform_device_register_full( |
5a3072be | 428 | const struct platform_device_info *pdevinfo) |
d8bf2540 | 429 | { |
44f28bde | 430 | int ret = -ENOMEM; |
d8bf2540 | 431 | struct platform_device *pdev; |
d8bf2540 | 432 | |
01dcc60a | 433 | pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
44f28bde | 434 | if (!pdev) |
01dcc60a UKK |
435 | goto err_alloc; |
436 | ||
437 | pdev->dev.parent = pdevinfo->parent; | |
863f9f30 | 438 | ACPI_HANDLE_SET(&pdev->dev, pdevinfo->acpi_node.handle); |
01dcc60a UKK |
439 | |
440 | if (pdevinfo->dma_mask) { | |
441 | /* | |
442 | * This memory isn't freed when the device is put, | |
443 | * I don't have a nice idea for that though. Conceptually | |
444 | * dma_mask in struct device should not be a pointer. | |
445 | * See http://thread.gmane.org/gmane.linux.kernel.pci/9081 | |
446 | */ | |
447 | pdev->dev.dma_mask = | |
448 | kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); | |
449 | if (!pdev->dev.dma_mask) | |
450 | goto err; | |
451 | ||
452 | *pdev->dev.dma_mask = pdevinfo->dma_mask; | |
453 | pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; | |
454 | } | |
d8bf2540 | 455 | |
01dcc60a UKK |
456 | ret = platform_device_add_resources(pdev, |
457 | pdevinfo->res, pdevinfo->num_res); | |
807508c8 AV |
458 | if (ret) |
459 | goto err; | |
44f28bde | 460 | |
01dcc60a UKK |
461 | ret = platform_device_add_data(pdev, |
462 | pdevinfo->data, pdevinfo->size_data); | |
807508c8 AV |
463 | if (ret) |
464 | goto err; | |
d8bf2540 | 465 | |
44f28bde UKK |
466 | ret = platform_device_add(pdev); |
467 | if (ret) { | |
468 | err: | |
863f9f30 | 469 | ACPI_HANDLE_SET(&pdev->dev, NULL); |
01dcc60a UKK |
470 | kfree(pdev->dev.dma_mask); |
471 | ||
472 | err_alloc: | |
44f28bde UKK |
473 | platform_device_put(pdev); |
474 | return ERR_PTR(ret); | |
475 | } | |
d8bf2540 DB |
476 | |
477 | return pdev; | |
d8bf2540 | 478 | } |
01dcc60a | 479 | EXPORT_SYMBOL_GPL(platform_device_register_full); |
d8bf2540 | 480 | |
00d3dcdd RK |
481 | static int platform_drv_probe(struct device *_dev) |
482 | { | |
483 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
484 | struct platform_device *dev = to_platform_device(_dev); | |
94d76d5d | 485 | int ret; |
00d3dcdd | 486 | |
94d76d5d RW |
487 | if (ACPI_HANDLE(_dev)) |
488 | acpi_dev_pm_attach(_dev, true); | |
489 | ||
490 | ret = drv->probe(dev); | |
491 | if (ret && ACPI_HANDLE(_dev)) | |
492 | acpi_dev_pm_detach(_dev, true); | |
493 | ||
494 | return ret; | |
00d3dcdd RK |
495 | } |
496 | ||
c67334fb DB |
497 | static int platform_drv_probe_fail(struct device *_dev) |
498 | { | |
499 | return -ENXIO; | |
500 | } | |
501 | ||
00d3dcdd RK |
502 | static int platform_drv_remove(struct device *_dev) |
503 | { | |
504 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
505 | struct platform_device *dev = to_platform_device(_dev); | |
94d76d5d | 506 | int ret; |
00d3dcdd | 507 | |
94d76d5d RW |
508 | ret = drv->remove(dev); |
509 | if (ACPI_HANDLE(_dev)) | |
510 | acpi_dev_pm_detach(_dev, true); | |
511 | ||
512 | return ret; | |
00d3dcdd RK |
513 | } |
514 | ||
515 | static void platform_drv_shutdown(struct device *_dev) | |
516 | { | |
517 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
518 | struct platform_device *dev = to_platform_device(_dev); | |
519 | ||
520 | drv->shutdown(dev); | |
94d76d5d RW |
521 | if (ACPI_HANDLE(_dev)) |
522 | acpi_dev_pm_detach(_dev, true); | |
00d3dcdd RK |
523 | } |
524 | ||
00d3dcdd | 525 | /** |
3c31f07a | 526 | * platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 527 | * @drv: platform driver structure |
00d3dcdd RK |
528 | */ |
529 | int platform_driver_register(struct platform_driver *drv) | |
530 | { | |
531 | drv->driver.bus = &platform_bus_type; | |
532 | if (drv->probe) | |
533 | drv->driver.probe = platform_drv_probe; | |
534 | if (drv->remove) | |
535 | drv->driver.remove = platform_drv_remove; | |
536 | if (drv->shutdown) | |
537 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 538 | |
00d3dcdd RK |
539 | return driver_register(&drv->driver); |
540 | } | |
541 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
542 | ||
543 | /** | |
3c31f07a | 544 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 545 | * @drv: platform driver structure |
00d3dcdd RK |
546 | */ |
547 | void platform_driver_unregister(struct platform_driver *drv) | |
548 | { | |
549 | driver_unregister(&drv->driver); | |
550 | } | |
551 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
552 | ||
c67334fb DB |
553 | /** |
554 | * platform_driver_probe - register driver for non-hotpluggable device | |
555 | * @drv: platform driver structure | |
647c86d0 FP |
556 | * @probe: the driver probe routine, probably from an __init section, |
557 | * must not return -EPROBE_DEFER. | |
c67334fb DB |
558 | * |
559 | * Use this instead of platform_driver_register() when you know the device | |
560 | * is not hotpluggable and has already been registered, and you want to | |
561 | * remove its run-once probe() infrastructure from memory after the driver | |
562 | * has bound to the device. | |
563 | * | |
564 | * One typical use for this would be with drivers for controllers integrated | |
565 | * into system-on-chip processors, where the controller devices have been | |
566 | * configured as part of board setup. | |
567 | * | |
647c86d0 FP |
568 | * This is incompatible with deferred probing so probe() must not |
569 | * return -EPROBE_DEFER. | |
570 | * | |
c67334fb DB |
571 | * Returns zero if the driver registered and bound to a device, else returns |
572 | * a negative error code and with the driver not registered. | |
573 | */ | |
c63e0783 | 574 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
575 | int (*probe)(struct platform_device *)) |
576 | { | |
577 | int retval, code; | |
578 | ||
1a6f2a75 DT |
579 | /* make sure driver won't have bind/unbind attributes */ |
580 | drv->driver.suppress_bind_attrs = true; | |
581 | ||
c67334fb DB |
582 | /* temporary section violation during probe() */ |
583 | drv->probe = probe; | |
584 | retval = code = platform_driver_register(drv); | |
585 | ||
1a6f2a75 DT |
586 | /* |
587 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
588 | * the list of drivers in order to probe new devices. Check to see |
589 | * if the probe was successful, and make sure any forced probes of | |
590 | * new devices fail. | |
591 | */ | |
d79d3244 | 592 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb | 593 | drv->probe = NULL; |
e5dd1278 | 594 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
595 | retval = -ENODEV; |
596 | drv->driver.probe = platform_drv_probe_fail; | |
d79d3244 | 597 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
598 | |
599 | if (code != retval) | |
600 | platform_driver_unregister(drv); | |
601 | return retval; | |
602 | } | |
603 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 604 | |
ecdf6ceb DT |
605 | /** |
606 | * platform_create_bundle - register driver and create corresponding device | |
607 | * @driver: platform driver structure | |
608 | * @probe: the driver probe routine, probably from an __init section | |
609 | * @res: set of resources that needs to be allocated for the device | |
610 | * @n_res: number of resources | |
611 | * @data: platform specific data for this platform device | |
612 | * @size: size of platform specific data | |
613 | * | |
614 | * Use this in legacy-style modules that probe hardware directly and | |
615 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
616 | * |
617 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb DT |
618 | */ |
619 | struct platform_device * __init_or_module platform_create_bundle( | |
620 | struct platform_driver *driver, | |
621 | int (*probe)(struct platform_device *), | |
622 | struct resource *res, unsigned int n_res, | |
623 | const void *data, size_t size) | |
624 | { | |
625 | struct platform_device *pdev; | |
626 | int error; | |
627 | ||
628 | pdev = platform_device_alloc(driver->driver.name, -1); | |
629 | if (!pdev) { | |
630 | error = -ENOMEM; | |
631 | goto err_out; | |
632 | } | |
633 | ||
807508c8 AV |
634 | error = platform_device_add_resources(pdev, res, n_res); |
635 | if (error) | |
636 | goto err_pdev_put; | |
ecdf6ceb | 637 | |
807508c8 AV |
638 | error = platform_device_add_data(pdev, data, size); |
639 | if (error) | |
640 | goto err_pdev_put; | |
ecdf6ceb DT |
641 | |
642 | error = platform_device_add(pdev); | |
643 | if (error) | |
644 | goto err_pdev_put; | |
645 | ||
646 | error = platform_driver_probe(driver, probe); | |
647 | if (error) | |
648 | goto err_pdev_del; | |
649 | ||
650 | return pdev; | |
651 | ||
652 | err_pdev_del: | |
653 | platform_device_del(pdev); | |
654 | err_pdev_put: | |
655 | platform_device_put(pdev); | |
656 | err_out: | |
657 | return ERR_PTR(error); | |
658 | } | |
659 | EXPORT_SYMBOL_GPL(platform_create_bundle); | |
660 | ||
a0245f7a DB |
661 | /* modalias support enables more hands-off userspace setup: |
662 | * (a) environment variable lets new-style hotplug events work once system is | |
663 | * fully running: "modprobe $MODALIAS" | |
664 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
665 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
666 | */ | |
4a3ad20c GKH |
667 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
668 | char *buf) | |
a0245f7a DB |
669 | { |
670 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 671 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
672 | |
673 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
674 | } | |
675 | ||
676 | static struct device_attribute platform_dev_attrs[] = { | |
677 | __ATTR_RO(modalias), | |
678 | __ATTR_NULL, | |
679 | }; | |
680 | ||
7eff2e7a | 681 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
682 | { |
683 | struct platform_device *pdev = to_platform_device(dev); | |
eca39301 GL |
684 | int rc; |
685 | ||
686 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
0258e182 | 687 | rc = of_device_uevent_modalias(dev, env); |
eca39301 GL |
688 | if (rc != -ENODEV) |
689 | return rc; | |
a0245f7a | 690 | |
57fee4a5 | 691 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
0a26813c | 692 | pdev->name); |
a0245f7a DB |
693 | return 0; |
694 | } | |
695 | ||
57fee4a5 | 696 | static const struct platform_device_id *platform_match_id( |
831fad2f | 697 | const struct platform_device_id *id, |
57fee4a5 EM |
698 | struct platform_device *pdev) |
699 | { | |
700 | while (id->name[0]) { | |
701 | if (strcmp(pdev->name, id->name) == 0) { | |
702 | pdev->id_entry = id; | |
703 | return id; | |
704 | } | |
705 | id++; | |
706 | } | |
707 | return NULL; | |
708 | } | |
709 | ||
1da177e4 | 710 | /** |
4a3ad20c GKH |
711 | * platform_match - bind platform device to platform driver. |
712 | * @dev: device. | |
713 | * @drv: driver. | |
1da177e4 | 714 | * |
4a3ad20c GKH |
715 | * Platform device IDs are assumed to be encoded like this: |
716 | * "<name><instance>", where <name> is a short description of the type of | |
717 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
718 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
719 | * "<name>". So, extract the <name> from the platform_device structure, | |
720 | * and compare it against the name of the driver. Return whether they match | |
721 | * or not. | |
1da177e4 | 722 | */ |
4a3ad20c | 723 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 724 | { |
71b3e0c1 | 725 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
726 | struct platform_driver *pdrv = to_platform_driver(drv); |
727 | ||
05212157 GL |
728 | /* Attempt an OF style match first */ |
729 | if (of_driver_match_device(dev, drv)) | |
730 | return 1; | |
731 | ||
91e56878 MW |
732 | /* Then try ACPI style match */ |
733 | if (acpi_driver_match_device(dev, drv)) | |
734 | return 1; | |
735 | ||
05212157 | 736 | /* Then try to match against the id table */ |
57fee4a5 EM |
737 | if (pdrv->id_table) |
738 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 739 | |
57fee4a5 | 740 | /* fall-back to driver name match */ |
1e0b2cf9 | 741 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
742 | } |
743 | ||
25e18499 RW |
744 | #ifdef CONFIG_PM_SLEEP |
745 | ||
746 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 747 | { |
783ea7d4 MD |
748 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
749 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
750 | int ret = 0; |
751 | ||
783ea7d4 MD |
752 | if (dev->driver && pdrv->suspend) |
753 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
754 | |
755 | return ret; | |
756 | } | |
757 | ||
25e18499 | 758 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 759 | { |
783ea7d4 MD |
760 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
761 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
762 | int ret = 0; |
763 | ||
783ea7d4 MD |
764 | if (dev->driver && pdrv->resume) |
765 | ret = pdrv->resume(pdev); | |
9480e307 | 766 | |
1da177e4 LT |
767 | return ret; |
768 | } | |
769 | ||
69c9dd1e | 770 | #endif /* CONFIG_PM_SLEEP */ |
9d730229 | 771 | |
25e18499 RW |
772 | #ifdef CONFIG_SUSPEND |
773 | ||
69c9dd1e | 774 | int platform_pm_suspend(struct device *dev) |
25e18499 RW |
775 | { |
776 | struct device_driver *drv = dev->driver; | |
777 | int ret = 0; | |
778 | ||
adf09493 RW |
779 | if (!drv) |
780 | return 0; | |
781 | ||
782 | if (drv->pm) { | |
25e18499 RW |
783 | if (drv->pm->suspend) |
784 | ret = drv->pm->suspend(dev); | |
785 | } else { | |
786 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
787 | } | |
788 | ||
789 | return ret; | |
790 | } | |
791 | ||
69c9dd1e | 792 | int platform_pm_resume(struct device *dev) |
25e18499 RW |
793 | { |
794 | struct device_driver *drv = dev->driver; | |
795 | int ret = 0; | |
796 | ||
adf09493 RW |
797 | if (!drv) |
798 | return 0; | |
799 | ||
800 | if (drv->pm) { | |
25e18499 RW |
801 | if (drv->pm->resume) |
802 | ret = drv->pm->resume(dev); | |
803 | } else { | |
804 | ret = platform_legacy_resume(dev); | |
805 | } | |
806 | ||
807 | return ret; | |
808 | } | |
809 | ||
69c9dd1e | 810 | #endif /* CONFIG_SUSPEND */ |
25e18499 | 811 | |
1f112cee | 812 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 | 813 | |
69c9dd1e | 814 | int platform_pm_freeze(struct device *dev) |
25e18499 RW |
815 | { |
816 | struct device_driver *drv = dev->driver; | |
817 | int ret = 0; | |
818 | ||
819 | if (!drv) | |
820 | return 0; | |
821 | ||
822 | if (drv->pm) { | |
823 | if (drv->pm->freeze) | |
824 | ret = drv->pm->freeze(dev); | |
825 | } else { | |
826 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
827 | } | |
828 | ||
829 | return ret; | |
830 | } | |
831 | ||
69c9dd1e | 832 | int platform_pm_thaw(struct device *dev) |
25e18499 RW |
833 | { |
834 | struct device_driver *drv = dev->driver; | |
835 | int ret = 0; | |
836 | ||
adf09493 RW |
837 | if (!drv) |
838 | return 0; | |
839 | ||
840 | if (drv->pm) { | |
25e18499 RW |
841 | if (drv->pm->thaw) |
842 | ret = drv->pm->thaw(dev); | |
843 | } else { | |
844 | ret = platform_legacy_resume(dev); | |
845 | } | |
846 | ||
847 | return ret; | |
848 | } | |
849 | ||
69c9dd1e | 850 | int platform_pm_poweroff(struct device *dev) |
25e18499 RW |
851 | { |
852 | struct device_driver *drv = dev->driver; | |
853 | int ret = 0; | |
854 | ||
adf09493 RW |
855 | if (!drv) |
856 | return 0; | |
857 | ||
858 | if (drv->pm) { | |
25e18499 RW |
859 | if (drv->pm->poweroff) |
860 | ret = drv->pm->poweroff(dev); | |
861 | } else { | |
862 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
863 | } | |
864 | ||
865 | return ret; | |
866 | } | |
867 | ||
69c9dd1e | 868 | int platform_pm_restore(struct device *dev) |
25e18499 RW |
869 | { |
870 | struct device_driver *drv = dev->driver; | |
871 | int ret = 0; | |
872 | ||
adf09493 RW |
873 | if (!drv) |
874 | return 0; | |
875 | ||
876 | if (drv->pm) { | |
25e18499 RW |
877 | if (drv->pm->restore) |
878 | ret = drv->pm->restore(dev); | |
879 | } else { | |
880 | ret = platform_legacy_resume(dev); | |
881 | } | |
882 | ||
883 | return ret; | |
884 | } | |
885 | ||
69c9dd1e | 886 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 887 | |
d9ab7716 | 888 | static const struct dev_pm_ops platform_dev_pm_ops = { |
8b313a38 RW |
889 | .runtime_suspend = pm_generic_runtime_suspend, |
890 | .runtime_resume = pm_generic_runtime_resume, | |
891 | .runtime_idle = pm_generic_runtime_idle, | |
69c9dd1e | 892 | USE_PLATFORM_PM_SLEEP_OPS |
25e18499 RW |
893 | }; |
894 | ||
1da177e4 LT |
895 | struct bus_type platform_bus_type = { |
896 | .name = "platform", | |
a0245f7a | 897 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 898 | .match = platform_match, |
a0245f7a | 899 | .uevent = platform_uevent, |
9d730229 | 900 | .pm = &platform_dev_pm_ops, |
1da177e4 | 901 | }; |
a96b2042 | 902 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
903 | |
904 | int __init platform_bus_init(void) | |
905 | { | |
fbfb1445 CH |
906 | int error; |
907 | ||
13977091 MD |
908 | early_platform_cleanup(); |
909 | ||
fbfb1445 CH |
910 | error = device_register(&platform_bus); |
911 | if (error) | |
912 | return error; | |
913 | error = bus_register(&platform_bus_type); | |
914 | if (error) | |
915 | device_unregister(&platform_bus); | |
916 | return error; | |
1da177e4 LT |
917 | } |
918 | ||
919 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
920 | u64 dma_get_required_mask(struct device *dev) | |
921 | { | |
922 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
923 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
924 | u64 mask; | |
925 | ||
926 | if (!high_totalram) { | |
927 | /* convert to mask just covering totalram */ | |
928 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
929 | low_totalram += low_totalram - 1; | |
930 | mask = low_totalram; | |
931 | } else { | |
932 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
933 | high_totalram += high_totalram - 1; | |
934 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
935 | } | |
e88a0c2c | 936 | return mask; |
1da177e4 LT |
937 | } |
938 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
939 | #endif | |
13977091 MD |
940 | |
941 | static __initdata LIST_HEAD(early_platform_driver_list); | |
942 | static __initdata LIST_HEAD(early_platform_device_list); | |
943 | ||
944 | /** | |
4d26e139 | 945 | * early_platform_driver_register - register early platform driver |
d86c1302 | 946 | * @epdrv: early_platform driver structure |
13977091 | 947 | * @buf: string passed from early_param() |
4d26e139 MD |
948 | * |
949 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
950 | */ |
951 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
952 | char *buf) | |
953 | { | |
c60e0504 | 954 | char *tmp; |
13977091 MD |
955 | int n; |
956 | ||
957 | /* Simply add the driver to the end of the global list. | |
958 | * Drivers will by default be put on the list in compiled-in order. | |
959 | */ | |
960 | if (!epdrv->list.next) { | |
961 | INIT_LIST_HEAD(&epdrv->list); | |
962 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
963 | } | |
964 | ||
965 | /* If the user has specified device then make sure the driver | |
966 | * gets prioritized. The driver of the last device specified on | |
967 | * command line will be put first on the list. | |
968 | */ | |
969 | n = strlen(epdrv->pdrv->driver.name); | |
970 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
971 | list_move(&epdrv->list, &early_platform_driver_list); | |
972 | ||
c60e0504 MD |
973 | /* Allow passing parameters after device name */ |
974 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 975 | epdrv->requested_id = -1; |
c60e0504 MD |
976 | else { |
977 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
978 | &tmp, 10); | |
979 | ||
980 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
981 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
982 | n = 0; | |
983 | } else | |
984 | n += strcspn(&buf[n + 1], ",") + 1; | |
985 | } | |
986 | ||
987 | if (buf[n] == ',') | |
988 | n++; | |
989 | ||
990 | if (epdrv->bufsize) { | |
991 | memcpy(epdrv->buffer, &buf[n], | |
992 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
993 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
994 | } | |
13977091 MD |
995 | } |
996 | ||
997 | return 0; | |
998 | } | |
999 | ||
1000 | /** | |
4d26e139 | 1001 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
1002 | * @devs: array of early platform devices to add |
1003 | * @num: number of early platform devices in array | |
4d26e139 MD |
1004 | * |
1005 | * Used by early architecture code to register early platform devices and | |
1006 | * their platform data. | |
13977091 MD |
1007 | */ |
1008 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1009 | { | |
1010 | struct device *dev; | |
1011 | int i; | |
1012 | ||
1013 | /* simply add the devices to list */ | |
1014 | for (i = 0; i < num; i++) { | |
1015 | dev = &devs[i]->dev; | |
1016 | ||
1017 | if (!dev->devres_head.next) { | |
bed2b42d | 1018 | pm_runtime_early_init(dev); |
13977091 MD |
1019 | INIT_LIST_HEAD(&dev->devres_head); |
1020 | list_add_tail(&dev->devres_head, | |
1021 | &early_platform_device_list); | |
1022 | } | |
1023 | } | |
1024 | } | |
1025 | ||
1026 | /** | |
4d26e139 | 1027 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 1028 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
1029 | * |
1030 | * Used by architecture code to register all early platform drivers | |
1031 | * for a certain class. If omitted then only early platform drivers | |
1032 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
1033 | */ |
1034 | void __init early_platform_driver_register_all(char *class_str) | |
1035 | { | |
1036 | /* The "class_str" parameter may or may not be present on the kernel | |
1037 | * command line. If it is present then there may be more than one | |
1038 | * matching parameter. | |
1039 | * | |
1040 | * Since we register our early platform drivers using early_param() | |
1041 | * we need to make sure that they also get registered in the case | |
1042 | * when the parameter is missing from the kernel command line. | |
1043 | * | |
1044 | * We use parse_early_options() to make sure the early_param() gets | |
1045 | * called at least once. The early_param() may be called more than | |
1046 | * once since the name of the preferred device may be specified on | |
1047 | * the kernel command line. early_platform_driver_register() handles | |
1048 | * this case for us. | |
1049 | */ | |
1050 | parse_early_options(class_str); | |
1051 | } | |
1052 | ||
1053 | /** | |
4d26e139 | 1054 | * early_platform_match - find early platform device matching driver |
d86c1302 | 1055 | * @epdrv: early platform driver structure |
13977091 MD |
1056 | * @id: id to match against |
1057 | */ | |
1058 | static __init struct platform_device * | |
1059 | early_platform_match(struct early_platform_driver *epdrv, int id) | |
1060 | { | |
1061 | struct platform_device *pd; | |
1062 | ||
1063 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1064 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1065 | if (pd->id == id) | |
1066 | return pd; | |
1067 | ||
1068 | return NULL; | |
1069 | } | |
1070 | ||
1071 | /** | |
4d26e139 | 1072 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1073 | * @epdrv: early platform driver structure |
13977091 MD |
1074 | * @id: return true if id or above exists |
1075 | */ | |
1076 | static __init int early_platform_left(struct early_platform_driver *epdrv, | |
1077 | int id) | |
1078 | { | |
1079 | struct platform_device *pd; | |
1080 | ||
1081 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1082 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1083 | if (pd->id >= id) | |
1084 | return 1; | |
1085 | ||
1086 | return 0; | |
1087 | } | |
1088 | ||
1089 | /** | |
4d26e139 | 1090 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1091 | * @class_str: string to identify early platform driver class |
1092 | * @id: id to match against | |
1093 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1094 | */ | |
1095 | static int __init early_platform_driver_probe_id(char *class_str, | |
1096 | int id, | |
1097 | int nr_probe) | |
1098 | { | |
1099 | struct early_platform_driver *epdrv; | |
1100 | struct platform_device *match; | |
1101 | int match_id; | |
1102 | int n = 0; | |
1103 | int left = 0; | |
1104 | ||
1105 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1106 | /* only use drivers matching our class_str */ | |
1107 | if (strcmp(class_str, epdrv->class_str)) | |
1108 | continue; | |
1109 | ||
1110 | if (id == -2) { | |
1111 | match_id = epdrv->requested_id; | |
1112 | left = 1; | |
1113 | ||
1114 | } else { | |
1115 | match_id = id; | |
1116 | left += early_platform_left(epdrv, id); | |
1117 | ||
1118 | /* skip requested id */ | |
1119 | switch (epdrv->requested_id) { | |
1120 | case EARLY_PLATFORM_ID_ERROR: | |
1121 | case EARLY_PLATFORM_ID_UNSET: | |
1122 | break; | |
1123 | default: | |
1124 | if (epdrv->requested_id == id) | |
1125 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1126 | } | |
1127 | } | |
1128 | ||
1129 | switch (match_id) { | |
1130 | case EARLY_PLATFORM_ID_ERROR: | |
0258e182 FP |
1131 | pr_warn("%s: unable to parse %s parameter\n", |
1132 | class_str, epdrv->pdrv->driver.name); | |
13977091 MD |
1133 | /* fall-through */ |
1134 | case EARLY_PLATFORM_ID_UNSET: | |
1135 | match = NULL; | |
1136 | break; | |
1137 | default: | |
1138 | match = early_platform_match(epdrv, match_id); | |
1139 | } | |
1140 | ||
1141 | if (match) { | |
a636ee7f PM |
1142 | /* |
1143 | * Set up a sensible init_name to enable | |
1144 | * dev_name() and others to be used before the | |
1145 | * rest of the driver core is initialized. | |
1146 | */ | |
06fe53be | 1147 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1148 | if (match->id != -1) |
bd05086b PM |
1149 | match->dev.init_name = |
1150 | kasprintf(GFP_KERNEL, "%s.%d", | |
1151 | match->name, | |
1152 | match->id); | |
a636ee7f | 1153 | else |
bd05086b PM |
1154 | match->dev.init_name = |
1155 | kasprintf(GFP_KERNEL, "%s", | |
1156 | match->name); | |
a636ee7f | 1157 | |
a636ee7f PM |
1158 | if (!match->dev.init_name) |
1159 | return -ENOMEM; | |
1160 | } | |
bd05086b | 1161 | |
13977091 | 1162 | if (epdrv->pdrv->probe(match)) |
0258e182 FP |
1163 | pr_warn("%s: unable to probe %s early.\n", |
1164 | class_str, match->name); | |
13977091 MD |
1165 | else |
1166 | n++; | |
1167 | } | |
1168 | ||
1169 | if (n >= nr_probe) | |
1170 | break; | |
1171 | } | |
1172 | ||
1173 | if (left) | |
1174 | return n; | |
1175 | else | |
1176 | return -ENODEV; | |
1177 | } | |
1178 | ||
1179 | /** | |
4d26e139 | 1180 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1181 | * @class_str: string to identify early platform driver class |
1182 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1183 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1184 | * |
1185 | * Used by architecture code to probe registered early platform drivers | |
1186 | * within a certain class. For probe to happen a registered early platform | |
1187 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1188 | */ |
1189 | int __init early_platform_driver_probe(char *class_str, | |
1190 | int nr_probe, | |
1191 | int user_only) | |
1192 | { | |
1193 | int k, n, i; | |
1194 | ||
1195 | n = 0; | |
1196 | for (i = -2; n < nr_probe; i++) { | |
1197 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1198 | ||
1199 | if (k < 0) | |
1200 | break; | |
1201 | ||
1202 | n += k; | |
1203 | ||
1204 | if (user_only) | |
1205 | break; | |
1206 | } | |
1207 | ||
1208 | return n; | |
1209 | } | |
1210 | ||
1211 | /** | |
1212 | * early_platform_cleanup - clean up early platform code | |
1213 | */ | |
1214 | void __init early_platform_cleanup(void) | |
1215 | { | |
1216 | struct platform_device *pd, *pd2; | |
1217 | ||
1218 | /* clean up the devres list used to chain devices */ | |
1219 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1220 | dev.devres_head) { | |
1221 | list_del(&pd->dev.devres_head); | |
1222 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1223 | } | |
1224 | } | |
1225 |