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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> |
9ec36caf | 16 | #include <linux/of_irq.h> |
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/init.h> | |
19 | #include <linux/dma-mapping.h> | |
20 | #include <linux/bootmem.h> | |
21 | #include <linux/err.h> | |
4e57b681 | 22 | #include <linux/slab.h> |
9d730229 | 23 | #include <linux/pm_runtime.h> |
689ae231 | 24 | #include <linux/idr.h> |
91e56878 | 25 | #include <linux/acpi.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 | ||
1da177e4 | 33 | struct device platform_bus = { |
1e0b2cf9 | 34 | .init_name = "platform", |
1da177e4 | 35 | }; |
a96b2042 | 36 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 | 37 | |
a77ce816 KG |
38 | /** |
39 | * arch_setup_pdev_archdata - Allow manipulation of archdata before its used | |
7de636fa | 40 | * @pdev: platform device |
a77ce816 KG |
41 | * |
42 | * This is called before platform_device_add() such that any pdev_archdata may | |
43 | * be setup before the platform_notifier is called. So if a user needs to | |
44 | * manipulate any relevant information in the pdev_archdata they can do: | |
45 | * | |
b1d6d822 | 46 | * platform_device_alloc() |
0258e182 FP |
47 | * ... manipulate ... |
48 | * platform_device_add() | |
a77ce816 KG |
49 | * |
50 | * And if they don't care they can just call platform_device_register() and | |
51 | * everything will just work out. | |
52 | */ | |
53 | void __weak arch_setup_pdev_archdata(struct platform_device *pdev) | |
54 | { | |
55 | } | |
56 | ||
1da177e4 | 57 | /** |
4a3ad20c GKH |
58 | * platform_get_resource - get a resource for a device |
59 | * @dev: platform device | |
60 | * @type: resource type | |
61 | * @num: resource index | |
1da177e4 | 62 | */ |
4a3ad20c GKH |
63 | struct resource *platform_get_resource(struct platform_device *dev, |
64 | unsigned int type, unsigned int num) | |
1da177e4 LT |
65 | { |
66 | int i; | |
67 | ||
68 | for (i = 0; i < dev->num_resources; i++) { | |
69 | struct resource *r = &dev->resource[i]; | |
70 | ||
c9f66169 MD |
71 | if (type == resource_type(r) && num-- == 0) |
72 | return r; | |
1da177e4 LT |
73 | } |
74 | return NULL; | |
75 | } | |
a96b2042 | 76 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
77 | |
78 | /** | |
4a3ad20c GKH |
79 | * platform_get_irq - get an IRQ for a device |
80 | * @dev: platform device | |
81 | * @num: IRQ number index | |
1da177e4 LT |
82 | */ |
83 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
84 | { | |
5cf8f7db AL |
85 | #ifdef CONFIG_SPARC |
86 | /* sparc does not have irqs represented as IORESOURCE_IRQ resources */ | |
87 | if (!dev || num >= dev->archdata.num_irqs) | |
88 | return -ENXIO; | |
89 | return dev->archdata.irqs[num]; | |
90 | #else | |
9ec36caf RH |
91 | struct resource *r; |
92 | if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) | |
93 | return of_irq_get(dev->dev.of_node, num); | |
94 | ||
95 | r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
1da177e4 | 96 | |
305b3228 | 97 | return r ? r->start : -ENXIO; |
5cf8f7db | 98 | #endif |
1da177e4 | 99 | } |
a96b2042 | 100 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
101 | |
102 | /** | |
4a3ad20c GKH |
103 | * platform_get_resource_byname - get a resource for a device by name |
104 | * @dev: platform device | |
105 | * @type: resource type | |
106 | * @name: resource name | |
1da177e4 | 107 | */ |
4a3ad20c | 108 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
109 | unsigned int type, |
110 | const char *name) | |
1da177e4 LT |
111 | { |
112 | int i; | |
113 | ||
114 | for (i = 0; i < dev->num_resources; i++) { | |
115 | struct resource *r = &dev->resource[i]; | |
116 | ||
1b8cb929 PU |
117 | if (unlikely(!r->name)) |
118 | continue; | |
119 | ||
c9f66169 MD |
120 | if (type == resource_type(r) && !strcmp(r->name, name)) |
121 | return r; | |
1da177e4 LT |
122 | } |
123 | return NULL; | |
124 | } | |
a96b2042 | 125 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
126 | |
127 | /** | |
d6ff8551 | 128 | * platform_get_irq_byname - get an IRQ for a device by name |
4a3ad20c GKH |
129 | * @dev: platform device |
130 | * @name: IRQ name | |
1da177e4 | 131 | */ |
c0afe7ba | 132 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
1da177e4 | 133 | { |
ad69674e GS |
134 | struct resource *r; |
135 | ||
136 | if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) | |
137 | return of_irq_get_byname(dev->dev.of_node, name); | |
1da177e4 | 138 | |
ad69674e | 139 | r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name); |
305b3228 | 140 | return r ? r->start : -ENXIO; |
1da177e4 | 141 | } |
a96b2042 | 142 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
143 | |
144 | /** | |
4a3ad20c GKH |
145 | * platform_add_devices - add a numbers of platform devices |
146 | * @devs: array of platform devices to add | |
147 | * @num: number of platform devices in array | |
1da177e4 LT |
148 | */ |
149 | int platform_add_devices(struct platform_device **devs, int num) | |
150 | { | |
151 | int i, ret = 0; | |
152 | ||
153 | for (i = 0; i < num; i++) { | |
154 | ret = platform_device_register(devs[i]); | |
155 | if (ret) { | |
156 | while (--i >= 0) | |
157 | platform_device_unregister(devs[i]); | |
158 | break; | |
159 | } | |
160 | } | |
161 | ||
162 | return ret; | |
163 | } | |
a96b2042 | 164 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 165 | |
37c12e74 RK |
166 | struct platform_object { |
167 | struct platform_device pdev; | |
168 | char name[1]; | |
169 | }; | |
170 | ||
1da177e4 | 171 | /** |
3c31f07a | 172 | * platform_device_put - destroy a platform device |
4a3ad20c | 173 | * @pdev: platform device to free |
37c12e74 | 174 | * |
4a3ad20c GKH |
175 | * Free all memory associated with a platform device. This function must |
176 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
177 | */ |
178 | void platform_device_put(struct platform_device *pdev) | |
179 | { | |
180 | if (pdev) | |
181 | put_device(&pdev->dev); | |
182 | } | |
183 | EXPORT_SYMBOL_GPL(platform_device_put); | |
184 | ||
185 | static void platform_device_release(struct device *dev) | |
186 | { | |
4a3ad20c GKH |
187 | struct platform_object *pa = container_of(dev, struct platform_object, |
188 | pdev.dev); | |
37c12e74 | 189 | |
7096d042 | 190 | of_device_node_put(&pa->pdev.dev); |
37c12e74 | 191 | kfree(pa->pdev.dev.platform_data); |
e710d7d5 | 192 | kfree(pa->pdev.mfd_cell); |
37c12e74 RK |
193 | kfree(pa->pdev.resource); |
194 | kfree(pa); | |
195 | } | |
196 | ||
197 | /** | |
3c31f07a | 198 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
199 | * @name: base name of the device we're adding |
200 | * @id: instance id | |
37c12e74 | 201 | * |
4a3ad20c GKH |
202 | * Create a platform device object which can have other objects attached |
203 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 204 | */ |
1359555e | 205 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
206 | { |
207 | struct platform_object *pa; | |
208 | ||
209 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); | |
210 | if (pa) { | |
211 | strcpy(pa->name, name); | |
212 | pa->pdev.name = pa->name; | |
213 | pa->pdev.id = id; | |
214 | device_initialize(&pa->pdev.dev); | |
215 | pa->pdev.dev.release = platform_device_release; | |
a77ce816 | 216 | arch_setup_pdev_archdata(&pa->pdev); |
37c12e74 RK |
217 | } |
218 | ||
93ce3061 | 219 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
220 | } |
221 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
222 | ||
223 | /** | |
3c31f07a | 224 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
225 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
226 | * @res: set of resources that needs to be allocated for the device | |
227 | * @num: number of resources | |
37c12e74 | 228 | * |
4a3ad20c GKH |
229 | * Add a copy of the resources to the platform device. The memory |
230 | * associated with the resources will be freed when the platform device is | |
231 | * released. | |
37c12e74 | 232 | */ |
4a3ad20c | 233 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 234 | const struct resource *res, unsigned int num) |
37c12e74 | 235 | { |
cea89623 | 236 | struct resource *r = NULL; |
37c12e74 | 237 | |
cea89623 UKK |
238 | if (res) { |
239 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); | |
240 | if (!r) | |
241 | return -ENOMEM; | |
37c12e74 | 242 | } |
cea89623 | 243 | |
4a03d6f7 | 244 | kfree(pdev->resource); |
cea89623 UKK |
245 | pdev->resource = r; |
246 | pdev->num_resources = num; | |
247 | return 0; | |
37c12e74 RK |
248 | } |
249 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
250 | ||
251 | /** | |
3c31f07a | 252 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
253 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
254 | * @data: platform specific data for this platform device | |
255 | * @size: size of platform specific data | |
37c12e74 | 256 | * |
4a3ad20c GKH |
257 | * Add a copy of platform specific data to the platform device's |
258 | * platform_data pointer. The memory associated with the platform data | |
259 | * will be freed when the platform device is released. | |
37c12e74 | 260 | */ |
4a3ad20c GKH |
261 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
262 | size_t size) | |
37c12e74 | 263 | { |
27a33f9e | 264 | void *d = NULL; |
5cfc64ce | 265 | |
27a33f9e UKK |
266 | if (data) { |
267 | d = kmemdup(data, size, GFP_KERNEL); | |
268 | if (!d) | |
269 | return -ENOMEM; | |
37c12e74 | 270 | } |
27a33f9e | 271 | |
251e031d | 272 | kfree(pdev->dev.platform_data); |
27a33f9e UKK |
273 | pdev->dev.platform_data = d; |
274 | return 0; | |
37c12e74 RK |
275 | } |
276 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
277 | ||
278 | /** | |
4a3ad20c GKH |
279 | * platform_device_add - add a platform device to device hierarchy |
280 | * @pdev: platform device we're adding | |
1da177e4 | 281 | * |
4a3ad20c GKH |
282 | * This is part 2 of platform_device_register(), though may be called |
283 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 284 | */ |
37c12e74 | 285 | int platform_device_add(struct platform_device *pdev) |
1da177e4 | 286 | { |
689ae231 | 287 | int i, ret; |
1da177e4 LT |
288 | |
289 | if (!pdev) | |
290 | return -EINVAL; | |
291 | ||
292 | if (!pdev->dev.parent) | |
293 | pdev->dev.parent = &platform_bus; | |
294 | ||
295 | pdev->dev.bus = &platform_bus_type; | |
296 | ||
689ae231 JD |
297 | switch (pdev->id) { |
298 | default: | |
1e0b2cf9 | 299 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
689ae231 JD |
300 | break; |
301 | case PLATFORM_DEVID_NONE: | |
acc0e90f | 302 | dev_set_name(&pdev->dev, "%s", pdev->name); |
689ae231 JD |
303 | break; |
304 | case PLATFORM_DEVID_AUTO: | |
305 | /* | |
306 | * Automatically allocated device ID. We mark it as such so | |
307 | * that we remember it must be freed, and we append a suffix | |
308 | * to avoid namespace collision with explicit IDs. | |
309 | */ | |
310 | ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL); | |
311 | if (ret < 0) | |
312 | goto err_out; | |
313 | pdev->id = ret; | |
314 | pdev->id_auto = true; | |
315 | dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); | |
316 | break; | |
317 | } | |
1da177e4 LT |
318 | |
319 | for (i = 0; i < pdev->num_resources; i++) { | |
320 | struct resource *p, *r = &pdev->resource[i]; | |
321 | ||
322 | if (r->name == NULL) | |
1e0b2cf9 | 323 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
324 | |
325 | p = r->parent; | |
326 | if (!p) { | |
c9f66169 | 327 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 328 | p = &iomem_resource; |
c9f66169 | 329 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
330 | p = &ioport_resource; |
331 | } | |
332 | ||
d960bb4d | 333 | if (p && insert_resource(p, r)) { |
0258e182 | 334 | dev_err(&pdev->dev, "failed to claim resource %d\n", i); |
1da177e4 LT |
335 | ret = -EBUSY; |
336 | goto failed; | |
337 | } | |
338 | } | |
339 | ||
340 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 341 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 342 | |
e3915532 | 343 | ret = device_add(&pdev->dev); |
1da177e4 LT |
344 | if (ret == 0) |
345 | return ret; | |
346 | ||
347 | failed: | |
689ae231 JD |
348 | if (pdev->id_auto) { |
349 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
350 | pdev->id = PLATFORM_DEVID_AUTO; | |
351 | } | |
352 | ||
c9f66169 MD |
353 | while (--i >= 0) { |
354 | struct resource *r = &pdev->resource[i]; | |
355 | unsigned long type = resource_type(r); | |
356 | ||
357 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
358 | release_resource(r); | |
359 | } | |
360 | ||
689ae231 | 361 | err_out: |
1da177e4 LT |
362 | return ret; |
363 | } | |
37c12e74 RK |
364 | EXPORT_SYMBOL_GPL(platform_device_add); |
365 | ||
366 | /** | |
4a3ad20c GKH |
367 | * platform_device_del - remove a platform-level device |
368 | * @pdev: platform device we're removing | |
1da177e4 | 369 | * |
4a3ad20c GKH |
370 | * Note that this function will also release all memory- and port-based |
371 | * resources owned by the device (@dev->resource). This function must | |
372 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 373 | */ |
93ce3061 | 374 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
375 | { |
376 | int i; | |
377 | ||
378 | if (pdev) { | |
dc4c15d4 JD |
379 | device_del(&pdev->dev); |
380 | ||
689ae231 JD |
381 | if (pdev->id_auto) { |
382 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
383 | pdev->id = PLATFORM_DEVID_AUTO; | |
384 | } | |
385 | ||
1da177e4 LT |
386 | for (i = 0; i < pdev->num_resources; i++) { |
387 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
388 | unsigned long type = resource_type(r); |
389 | ||
390 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
391 | release_resource(r); |
392 | } | |
1da177e4 LT |
393 | } |
394 | } | |
93ce3061 DT |
395 | EXPORT_SYMBOL_GPL(platform_device_del); |
396 | ||
397 | /** | |
4a3ad20c GKH |
398 | * platform_device_register - add a platform-level device |
399 | * @pdev: platform device we're adding | |
93ce3061 | 400 | */ |
4a3ad20c | 401 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
402 | { |
403 | device_initialize(&pdev->dev); | |
a77ce816 | 404 | arch_setup_pdev_archdata(pdev); |
93ce3061 DT |
405 | return platform_device_add(pdev); |
406 | } | |
a96b2042 | 407 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
408 | |
409 | /** | |
4a3ad20c GKH |
410 | * platform_device_unregister - unregister a platform-level device |
411 | * @pdev: platform device we're unregistering | |
93ce3061 | 412 | * |
4a3ad20c GKH |
413 | * Unregistration is done in 2 steps. First we release all resources |
414 | * and remove it from the subsystem, then we drop reference count by | |
415 | * calling platform_device_put(). | |
93ce3061 | 416 | */ |
4a3ad20c | 417 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
418 | { |
419 | platform_device_del(pdev); | |
420 | platform_device_put(pdev); | |
421 | } | |
a96b2042 | 422 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 423 | |
1da177e4 | 424 | /** |
01dcc60a | 425 | * platform_device_register_full - add a platform-level device with |
44f28bde | 426 | * resources and platform-specific data |
49a4ec18 | 427 | * |
01dcc60a | 428 | * @pdevinfo: data used to create device |
d8bf2540 | 429 | * |
f0eae0ed | 430 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 431 | */ |
01dcc60a | 432 | struct platform_device *platform_device_register_full( |
5a3072be | 433 | const struct platform_device_info *pdevinfo) |
d8bf2540 | 434 | { |
44f28bde | 435 | int ret = -ENOMEM; |
d8bf2540 | 436 | struct platform_device *pdev; |
d8bf2540 | 437 | |
01dcc60a | 438 | pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
44f28bde | 439 | if (!pdev) |
01dcc60a UKK |
440 | goto err_alloc; |
441 | ||
442 | pdev->dev.parent = pdevinfo->parent; | |
7b199811 | 443 | ACPI_COMPANION_SET(&pdev->dev, pdevinfo->acpi_node.companion); |
01dcc60a UKK |
444 | |
445 | if (pdevinfo->dma_mask) { | |
446 | /* | |
447 | * This memory isn't freed when the device is put, | |
448 | * I don't have a nice idea for that though. Conceptually | |
449 | * dma_mask in struct device should not be a pointer. | |
450 | * See http://thread.gmane.org/gmane.linux.kernel.pci/9081 | |
451 | */ | |
452 | pdev->dev.dma_mask = | |
453 | kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); | |
454 | if (!pdev->dev.dma_mask) | |
455 | goto err; | |
456 | ||
457 | *pdev->dev.dma_mask = pdevinfo->dma_mask; | |
458 | pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; | |
459 | } | |
d8bf2540 | 460 | |
01dcc60a UKK |
461 | ret = platform_device_add_resources(pdev, |
462 | pdevinfo->res, pdevinfo->num_res); | |
807508c8 AV |
463 | if (ret) |
464 | goto err; | |
44f28bde | 465 | |
01dcc60a UKK |
466 | ret = platform_device_add_data(pdev, |
467 | pdevinfo->data, pdevinfo->size_data); | |
807508c8 AV |
468 | if (ret) |
469 | goto err; | |
d8bf2540 | 470 | |
44f28bde UKK |
471 | ret = platform_device_add(pdev); |
472 | if (ret) { | |
473 | err: | |
7b199811 | 474 | ACPI_COMPANION_SET(&pdev->dev, NULL); |
01dcc60a UKK |
475 | kfree(pdev->dev.dma_mask); |
476 | ||
477 | err_alloc: | |
44f28bde UKK |
478 | platform_device_put(pdev); |
479 | return ERR_PTR(ret); | |
480 | } | |
d8bf2540 DES |
481 | |
482 | return pdev; | |
d8bf2540 | 483 | } |
01dcc60a | 484 | EXPORT_SYMBOL_GPL(platform_device_register_full); |
d8bf2540 | 485 | |
00d3dcdd RK |
486 | static int platform_drv_probe(struct device *_dev) |
487 | { | |
488 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
489 | struct platform_device *dev = to_platform_device(_dev); | |
94d76d5d | 490 | int ret; |
00d3dcdd | 491 | |
9383f4c6 | 492 | acpi_dev_pm_attach(_dev, true); |
94d76d5d RW |
493 | |
494 | ret = drv->probe(dev); | |
9383f4c6 | 495 | if (ret) |
94d76d5d RW |
496 | acpi_dev_pm_detach(_dev, true); |
497 | ||
3f9120b0 JH |
498 | if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) { |
499 | dev_warn(_dev, "probe deferral not supported\n"); | |
500 | ret = -ENXIO; | |
501 | } | |
502 | ||
94d76d5d | 503 | return ret; |
00d3dcdd RK |
504 | } |
505 | ||
c67334fb DB |
506 | static int platform_drv_probe_fail(struct device *_dev) |
507 | { | |
508 | return -ENXIO; | |
509 | } | |
510 | ||
00d3dcdd RK |
511 | static int platform_drv_remove(struct device *_dev) |
512 | { | |
513 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
514 | struct platform_device *dev = to_platform_device(_dev); | |
94d76d5d | 515 | int ret; |
00d3dcdd | 516 | |
94d76d5d | 517 | ret = drv->remove(dev); |
9383f4c6 | 518 | acpi_dev_pm_detach(_dev, true); |
94d76d5d RW |
519 | |
520 | return ret; | |
00d3dcdd RK |
521 | } |
522 | ||
523 | static void platform_drv_shutdown(struct device *_dev) | |
524 | { | |
525 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
526 | struct platform_device *dev = to_platform_device(_dev); | |
527 | ||
528 | drv->shutdown(dev); | |
9383f4c6 | 529 | acpi_dev_pm_detach(_dev, true); |
00d3dcdd RK |
530 | } |
531 | ||
00d3dcdd | 532 | /** |
9447057e | 533 | * __platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 534 | * @drv: platform driver structure |
08801f96 | 535 | * @owner: owning module/driver |
00d3dcdd | 536 | */ |
9447057e LC |
537 | int __platform_driver_register(struct platform_driver *drv, |
538 | struct module *owner) | |
00d3dcdd | 539 | { |
9447057e | 540 | drv->driver.owner = owner; |
00d3dcdd RK |
541 | drv->driver.bus = &platform_bus_type; |
542 | if (drv->probe) | |
543 | drv->driver.probe = platform_drv_probe; | |
544 | if (drv->remove) | |
545 | drv->driver.remove = platform_drv_remove; | |
546 | if (drv->shutdown) | |
547 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 548 | |
00d3dcdd RK |
549 | return driver_register(&drv->driver); |
550 | } | |
9447057e | 551 | EXPORT_SYMBOL_GPL(__platform_driver_register); |
00d3dcdd RK |
552 | |
553 | /** | |
3c31f07a | 554 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 555 | * @drv: platform driver structure |
00d3dcdd RK |
556 | */ |
557 | void platform_driver_unregister(struct platform_driver *drv) | |
558 | { | |
559 | driver_unregister(&drv->driver); | |
560 | } | |
561 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
562 | ||
c67334fb DB |
563 | /** |
564 | * platform_driver_probe - register driver for non-hotpluggable device | |
565 | * @drv: platform driver structure | |
3f9120b0 | 566 | * @probe: the driver probe routine, probably from an __init section |
c67334fb DB |
567 | * |
568 | * Use this instead of platform_driver_register() when you know the device | |
569 | * is not hotpluggable and has already been registered, and you want to | |
570 | * remove its run-once probe() infrastructure from memory after the driver | |
571 | * has bound to the device. | |
572 | * | |
573 | * One typical use for this would be with drivers for controllers integrated | |
574 | * into system-on-chip processors, where the controller devices have been | |
575 | * configured as part of board setup. | |
576 | * | |
3f9120b0 | 577 | * Note that this is incompatible with deferred probing. |
647c86d0 | 578 | * |
c67334fb DB |
579 | * Returns zero if the driver registered and bound to a device, else returns |
580 | * a negative error code and with the driver not registered. | |
581 | */ | |
c63e0783 | 582 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
583 | int (*probe)(struct platform_device *)) |
584 | { | |
585 | int retval, code; | |
586 | ||
3f9120b0 JH |
587 | /* |
588 | * Prevent driver from requesting probe deferral to avoid further | |
589 | * futile probe attempts. | |
590 | */ | |
591 | drv->prevent_deferred_probe = true; | |
592 | ||
1a6f2a75 DT |
593 | /* make sure driver won't have bind/unbind attributes */ |
594 | drv->driver.suppress_bind_attrs = true; | |
595 | ||
c67334fb DB |
596 | /* temporary section violation during probe() */ |
597 | drv->probe = probe; | |
598 | retval = code = platform_driver_register(drv); | |
599 | ||
1a6f2a75 DT |
600 | /* |
601 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
602 | * the list of drivers in order to probe new devices. Check to see |
603 | * if the probe was successful, and make sure any forced probes of | |
604 | * new devices fail. | |
605 | */ | |
d79d3244 | 606 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb | 607 | drv->probe = NULL; |
e5dd1278 | 608 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
609 | retval = -ENODEV; |
610 | drv->driver.probe = platform_drv_probe_fail; | |
d79d3244 | 611 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
612 | |
613 | if (code != retval) | |
614 | platform_driver_unregister(drv); | |
615 | return retval; | |
616 | } | |
617 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 618 | |
ecdf6ceb DT |
619 | /** |
620 | * platform_create_bundle - register driver and create corresponding device | |
621 | * @driver: platform driver structure | |
622 | * @probe: the driver probe routine, probably from an __init section | |
623 | * @res: set of resources that needs to be allocated for the device | |
624 | * @n_res: number of resources | |
625 | * @data: platform specific data for this platform device | |
626 | * @size: size of platform specific data | |
627 | * | |
628 | * Use this in legacy-style modules that probe hardware directly and | |
629 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
630 | * |
631 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb DT |
632 | */ |
633 | struct platform_device * __init_or_module platform_create_bundle( | |
634 | struct platform_driver *driver, | |
635 | int (*probe)(struct platform_device *), | |
636 | struct resource *res, unsigned int n_res, | |
637 | const void *data, size_t size) | |
638 | { | |
639 | struct platform_device *pdev; | |
640 | int error; | |
641 | ||
642 | pdev = platform_device_alloc(driver->driver.name, -1); | |
643 | if (!pdev) { | |
644 | error = -ENOMEM; | |
645 | goto err_out; | |
646 | } | |
647 | ||
807508c8 AV |
648 | error = platform_device_add_resources(pdev, res, n_res); |
649 | if (error) | |
650 | goto err_pdev_put; | |
ecdf6ceb | 651 | |
807508c8 AV |
652 | error = platform_device_add_data(pdev, data, size); |
653 | if (error) | |
654 | goto err_pdev_put; | |
ecdf6ceb DT |
655 | |
656 | error = platform_device_add(pdev); | |
657 | if (error) | |
658 | goto err_pdev_put; | |
659 | ||
660 | error = platform_driver_probe(driver, probe); | |
661 | if (error) | |
662 | goto err_pdev_del; | |
663 | ||
664 | return pdev; | |
665 | ||
666 | err_pdev_del: | |
667 | platform_device_del(pdev); | |
668 | err_pdev_put: | |
669 | platform_device_put(pdev); | |
670 | err_out: | |
671 | return ERR_PTR(error); | |
672 | } | |
673 | EXPORT_SYMBOL_GPL(platform_create_bundle); | |
674 | ||
a0245f7a DB |
675 | /* modalias support enables more hands-off userspace setup: |
676 | * (a) environment variable lets new-style hotplug events work once system is | |
677 | * fully running: "modprobe $MODALIAS" | |
678 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
679 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
680 | */ | |
4a3ad20c GKH |
681 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
682 | char *buf) | |
a0245f7a DB |
683 | { |
684 | struct platform_device *pdev = to_platform_device(dev); | |
8c4ff6d0 ZR |
685 | int len; |
686 | ||
b9f73067 ZR |
687 | len = of_device_get_modalias(dev, buf, PAGE_SIZE -1); |
688 | if (len != -ENODEV) | |
689 | return len; | |
690 | ||
8c4ff6d0 ZR |
691 | len = acpi_device_modalias(dev, buf, PAGE_SIZE -1); |
692 | if (len != -ENODEV) | |
693 | return len; | |
694 | ||
695 | len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); | |
a0245f7a DB |
696 | |
697 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
698 | } | |
d06262e5 | 699 | static DEVICE_ATTR_RO(modalias); |
a0245f7a | 700 | |
d06262e5 GKH |
701 | static struct attribute *platform_dev_attrs[] = { |
702 | &dev_attr_modalias.attr, | |
703 | NULL, | |
a0245f7a | 704 | }; |
d06262e5 | 705 | ATTRIBUTE_GROUPS(platform_dev); |
a0245f7a | 706 | |
7eff2e7a | 707 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
708 | { |
709 | struct platform_device *pdev = to_platform_device(dev); | |
eca39301 GL |
710 | int rc; |
711 | ||
712 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
0258e182 | 713 | rc = of_device_uevent_modalias(dev, env); |
eca39301 GL |
714 | if (rc != -ENODEV) |
715 | return rc; | |
a0245f7a | 716 | |
8c4ff6d0 ZR |
717 | rc = acpi_device_uevent_modalias(dev, env); |
718 | if (rc != -ENODEV) | |
719 | return rc; | |
720 | ||
57fee4a5 | 721 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
0a26813c | 722 | pdev->name); |
a0245f7a DB |
723 | return 0; |
724 | } | |
725 | ||
57fee4a5 | 726 | static const struct platform_device_id *platform_match_id( |
831fad2f | 727 | const struct platform_device_id *id, |
57fee4a5 EM |
728 | struct platform_device *pdev) |
729 | { | |
730 | while (id->name[0]) { | |
731 | if (strcmp(pdev->name, id->name) == 0) { | |
732 | pdev->id_entry = id; | |
733 | return id; | |
734 | } | |
735 | id++; | |
736 | } | |
737 | return NULL; | |
738 | } | |
739 | ||
1da177e4 | 740 | /** |
4a3ad20c GKH |
741 | * platform_match - bind platform device to platform driver. |
742 | * @dev: device. | |
743 | * @drv: driver. | |
1da177e4 | 744 | * |
4a3ad20c GKH |
745 | * Platform device IDs are assumed to be encoded like this: |
746 | * "<name><instance>", where <name> is a short description of the type of | |
747 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
748 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
749 | * "<name>". So, extract the <name> from the platform_device structure, | |
750 | * and compare it against the name of the driver. Return whether they match | |
751 | * or not. | |
1da177e4 | 752 | */ |
4a3ad20c | 753 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 754 | { |
71b3e0c1 | 755 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
756 | struct platform_driver *pdrv = to_platform_driver(drv); |
757 | ||
05212157 GL |
758 | /* Attempt an OF style match first */ |
759 | if (of_driver_match_device(dev, drv)) | |
760 | return 1; | |
761 | ||
91e56878 MW |
762 | /* Then try ACPI style match */ |
763 | if (acpi_driver_match_device(dev, drv)) | |
764 | return 1; | |
765 | ||
05212157 | 766 | /* Then try to match against the id table */ |
57fee4a5 EM |
767 | if (pdrv->id_table) |
768 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 769 | |
57fee4a5 | 770 | /* fall-back to driver name match */ |
1e0b2cf9 | 771 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
772 | } |
773 | ||
25e18499 RW |
774 | #ifdef CONFIG_PM_SLEEP |
775 | ||
776 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 777 | { |
783ea7d4 MD |
778 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
779 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
780 | int ret = 0; |
781 | ||
783ea7d4 MD |
782 | if (dev->driver && pdrv->suspend) |
783 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
784 | |
785 | return ret; | |
786 | } | |
787 | ||
25e18499 | 788 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 789 | { |
783ea7d4 MD |
790 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
791 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
792 | int ret = 0; |
793 | ||
783ea7d4 MD |
794 | if (dev->driver && pdrv->resume) |
795 | ret = pdrv->resume(pdev); | |
9480e307 | 796 | |
1da177e4 LT |
797 | return ret; |
798 | } | |
799 | ||
69c9dd1e | 800 | #endif /* CONFIG_PM_SLEEP */ |
9d730229 | 801 | |
25e18499 RW |
802 | #ifdef CONFIG_SUSPEND |
803 | ||
69c9dd1e | 804 | int platform_pm_suspend(struct device *dev) |
25e18499 RW |
805 | { |
806 | struct device_driver *drv = dev->driver; | |
807 | int ret = 0; | |
808 | ||
adf09493 RW |
809 | if (!drv) |
810 | return 0; | |
811 | ||
812 | if (drv->pm) { | |
25e18499 RW |
813 | if (drv->pm->suspend) |
814 | ret = drv->pm->suspend(dev); | |
815 | } else { | |
816 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
817 | } | |
818 | ||
819 | return ret; | |
820 | } | |
821 | ||
69c9dd1e | 822 | int platform_pm_resume(struct device *dev) |
25e18499 RW |
823 | { |
824 | struct device_driver *drv = dev->driver; | |
825 | int ret = 0; | |
826 | ||
adf09493 RW |
827 | if (!drv) |
828 | return 0; | |
829 | ||
830 | if (drv->pm) { | |
25e18499 RW |
831 | if (drv->pm->resume) |
832 | ret = drv->pm->resume(dev); | |
833 | } else { | |
834 | ret = platform_legacy_resume(dev); | |
835 | } | |
836 | ||
837 | return ret; | |
838 | } | |
839 | ||
69c9dd1e | 840 | #endif /* CONFIG_SUSPEND */ |
25e18499 | 841 | |
1f112cee | 842 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 | 843 | |
69c9dd1e | 844 | int platform_pm_freeze(struct device *dev) |
25e18499 RW |
845 | { |
846 | struct device_driver *drv = dev->driver; | |
847 | int ret = 0; | |
848 | ||
849 | if (!drv) | |
850 | return 0; | |
851 | ||
852 | if (drv->pm) { | |
853 | if (drv->pm->freeze) | |
854 | ret = drv->pm->freeze(dev); | |
855 | } else { | |
856 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
857 | } | |
858 | ||
859 | return ret; | |
860 | } | |
861 | ||
69c9dd1e | 862 | int platform_pm_thaw(struct device *dev) |
25e18499 RW |
863 | { |
864 | struct device_driver *drv = dev->driver; | |
865 | int ret = 0; | |
866 | ||
adf09493 RW |
867 | if (!drv) |
868 | return 0; | |
869 | ||
870 | if (drv->pm) { | |
25e18499 RW |
871 | if (drv->pm->thaw) |
872 | ret = drv->pm->thaw(dev); | |
873 | } else { | |
874 | ret = platform_legacy_resume(dev); | |
875 | } | |
876 | ||
877 | return ret; | |
878 | } | |
879 | ||
69c9dd1e | 880 | int platform_pm_poweroff(struct device *dev) |
25e18499 RW |
881 | { |
882 | struct device_driver *drv = dev->driver; | |
883 | int ret = 0; | |
884 | ||
adf09493 RW |
885 | if (!drv) |
886 | return 0; | |
887 | ||
888 | if (drv->pm) { | |
25e18499 RW |
889 | if (drv->pm->poweroff) |
890 | ret = drv->pm->poweroff(dev); | |
891 | } else { | |
892 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
893 | } | |
894 | ||
895 | return ret; | |
896 | } | |
897 | ||
69c9dd1e | 898 | int platform_pm_restore(struct device *dev) |
25e18499 RW |
899 | { |
900 | struct device_driver *drv = dev->driver; | |
901 | int ret = 0; | |
902 | ||
adf09493 RW |
903 | if (!drv) |
904 | return 0; | |
905 | ||
906 | if (drv->pm) { | |
25e18499 RW |
907 | if (drv->pm->restore) |
908 | ret = drv->pm->restore(dev); | |
909 | } else { | |
910 | ret = platform_legacy_resume(dev); | |
911 | } | |
912 | ||
913 | return ret; | |
914 | } | |
915 | ||
69c9dd1e | 916 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 917 | |
d9ab7716 | 918 | static const struct dev_pm_ops platform_dev_pm_ops = { |
8b313a38 RW |
919 | .runtime_suspend = pm_generic_runtime_suspend, |
920 | .runtime_resume = pm_generic_runtime_resume, | |
69c9dd1e | 921 | USE_PLATFORM_PM_SLEEP_OPS |
25e18499 RW |
922 | }; |
923 | ||
1da177e4 LT |
924 | struct bus_type platform_bus_type = { |
925 | .name = "platform", | |
d06262e5 | 926 | .dev_groups = platform_dev_groups, |
1da177e4 | 927 | .match = platform_match, |
a0245f7a | 928 | .uevent = platform_uevent, |
9d730229 | 929 | .pm = &platform_dev_pm_ops, |
1da177e4 | 930 | }; |
a96b2042 | 931 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
932 | |
933 | int __init platform_bus_init(void) | |
934 | { | |
fbfb1445 CH |
935 | int error; |
936 | ||
13977091 MD |
937 | early_platform_cleanup(); |
938 | ||
fbfb1445 CH |
939 | error = device_register(&platform_bus); |
940 | if (error) | |
941 | return error; | |
942 | error = bus_register(&platform_bus_type); | |
943 | if (error) | |
944 | device_unregister(&platform_bus); | |
945 | return error; | |
1da177e4 LT |
946 | } |
947 | ||
948 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
949 | u64 dma_get_required_mask(struct device *dev) | |
950 | { | |
951 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
952 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
953 | u64 mask; | |
954 | ||
955 | if (!high_totalram) { | |
956 | /* convert to mask just covering totalram */ | |
957 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
958 | low_totalram += low_totalram - 1; | |
959 | mask = low_totalram; | |
960 | } else { | |
961 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
962 | high_totalram += high_totalram - 1; | |
963 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
964 | } | |
e88a0c2c | 965 | return mask; |
1da177e4 LT |
966 | } |
967 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
968 | #endif | |
13977091 MD |
969 | |
970 | static __initdata LIST_HEAD(early_platform_driver_list); | |
971 | static __initdata LIST_HEAD(early_platform_device_list); | |
972 | ||
973 | /** | |
4d26e139 | 974 | * early_platform_driver_register - register early platform driver |
d86c1302 | 975 | * @epdrv: early_platform driver structure |
13977091 | 976 | * @buf: string passed from early_param() |
4d26e139 MD |
977 | * |
978 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
979 | */ |
980 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
981 | char *buf) | |
982 | { | |
c60e0504 | 983 | char *tmp; |
13977091 MD |
984 | int n; |
985 | ||
986 | /* Simply add the driver to the end of the global list. | |
987 | * Drivers will by default be put on the list in compiled-in order. | |
988 | */ | |
989 | if (!epdrv->list.next) { | |
990 | INIT_LIST_HEAD(&epdrv->list); | |
991 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
992 | } | |
993 | ||
994 | /* If the user has specified device then make sure the driver | |
995 | * gets prioritized. The driver of the last device specified on | |
996 | * command line will be put first on the list. | |
997 | */ | |
998 | n = strlen(epdrv->pdrv->driver.name); | |
999 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
1000 | list_move(&epdrv->list, &early_platform_driver_list); | |
1001 | ||
c60e0504 MD |
1002 | /* Allow passing parameters after device name */ |
1003 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 1004 | epdrv->requested_id = -1; |
c60e0504 MD |
1005 | else { |
1006 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
1007 | &tmp, 10); | |
1008 | ||
1009 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
1010 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
1011 | n = 0; | |
1012 | } else | |
1013 | n += strcspn(&buf[n + 1], ",") + 1; | |
1014 | } | |
1015 | ||
1016 | if (buf[n] == ',') | |
1017 | n++; | |
1018 | ||
1019 | if (epdrv->bufsize) { | |
1020 | memcpy(epdrv->buffer, &buf[n], | |
1021 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
1022 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
1023 | } | |
13977091 MD |
1024 | } |
1025 | ||
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | /** | |
4d26e139 | 1030 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
1031 | * @devs: array of early platform devices to add |
1032 | * @num: number of early platform devices in array | |
4d26e139 MD |
1033 | * |
1034 | * Used by early architecture code to register early platform devices and | |
1035 | * their platform data. | |
13977091 MD |
1036 | */ |
1037 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1038 | { | |
1039 | struct device *dev; | |
1040 | int i; | |
1041 | ||
1042 | /* simply add the devices to list */ | |
1043 | for (i = 0; i < num; i++) { | |
1044 | dev = &devs[i]->dev; | |
1045 | ||
1046 | if (!dev->devres_head.next) { | |
bed2b42d | 1047 | pm_runtime_early_init(dev); |
13977091 MD |
1048 | INIT_LIST_HEAD(&dev->devres_head); |
1049 | list_add_tail(&dev->devres_head, | |
1050 | &early_platform_device_list); | |
1051 | } | |
1052 | } | |
1053 | } | |
1054 | ||
1055 | /** | |
4d26e139 | 1056 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 1057 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
1058 | * |
1059 | * Used by architecture code to register all early platform drivers | |
1060 | * for a certain class. If omitted then only early platform drivers | |
1061 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
1062 | */ |
1063 | void __init early_platform_driver_register_all(char *class_str) | |
1064 | { | |
1065 | /* The "class_str" parameter may or may not be present on the kernel | |
1066 | * command line. If it is present then there may be more than one | |
1067 | * matching parameter. | |
1068 | * | |
1069 | * Since we register our early platform drivers using early_param() | |
1070 | * we need to make sure that they also get registered in the case | |
1071 | * when the parameter is missing from the kernel command line. | |
1072 | * | |
1073 | * We use parse_early_options() to make sure the early_param() gets | |
1074 | * called at least once. The early_param() may be called more than | |
1075 | * once since the name of the preferred device may be specified on | |
1076 | * the kernel command line. early_platform_driver_register() handles | |
1077 | * this case for us. | |
1078 | */ | |
1079 | parse_early_options(class_str); | |
1080 | } | |
1081 | ||
1082 | /** | |
4d26e139 | 1083 | * early_platform_match - find early platform device matching driver |
d86c1302 | 1084 | * @epdrv: early platform driver structure |
13977091 MD |
1085 | * @id: id to match against |
1086 | */ | |
a8257910 | 1087 | static struct platform_device * __init |
13977091 MD |
1088 | early_platform_match(struct early_platform_driver *epdrv, int id) |
1089 | { | |
1090 | struct platform_device *pd; | |
1091 | ||
1092 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1093 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1094 | if (pd->id == id) | |
1095 | return pd; | |
1096 | ||
1097 | return NULL; | |
1098 | } | |
1099 | ||
1100 | /** | |
4d26e139 | 1101 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1102 | * @epdrv: early platform driver structure |
13977091 MD |
1103 | * @id: return true if id or above exists |
1104 | */ | |
a8257910 | 1105 | static int __init early_platform_left(struct early_platform_driver *epdrv, |
13977091 MD |
1106 | int id) |
1107 | { | |
1108 | struct platform_device *pd; | |
1109 | ||
1110 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1111 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1112 | if (pd->id >= id) | |
1113 | return 1; | |
1114 | ||
1115 | return 0; | |
1116 | } | |
1117 | ||
1118 | /** | |
4d26e139 | 1119 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1120 | * @class_str: string to identify early platform driver class |
1121 | * @id: id to match against | |
1122 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1123 | */ | |
1124 | static int __init early_platform_driver_probe_id(char *class_str, | |
1125 | int id, | |
1126 | int nr_probe) | |
1127 | { | |
1128 | struct early_platform_driver *epdrv; | |
1129 | struct platform_device *match; | |
1130 | int match_id; | |
1131 | int n = 0; | |
1132 | int left = 0; | |
1133 | ||
1134 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1135 | /* only use drivers matching our class_str */ | |
1136 | if (strcmp(class_str, epdrv->class_str)) | |
1137 | continue; | |
1138 | ||
1139 | if (id == -2) { | |
1140 | match_id = epdrv->requested_id; | |
1141 | left = 1; | |
1142 | ||
1143 | } else { | |
1144 | match_id = id; | |
1145 | left += early_platform_left(epdrv, id); | |
1146 | ||
1147 | /* skip requested id */ | |
1148 | switch (epdrv->requested_id) { | |
1149 | case EARLY_PLATFORM_ID_ERROR: | |
1150 | case EARLY_PLATFORM_ID_UNSET: | |
1151 | break; | |
1152 | default: | |
1153 | if (epdrv->requested_id == id) | |
1154 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | switch (match_id) { | |
1159 | case EARLY_PLATFORM_ID_ERROR: | |
0258e182 FP |
1160 | pr_warn("%s: unable to parse %s parameter\n", |
1161 | class_str, epdrv->pdrv->driver.name); | |
13977091 MD |
1162 | /* fall-through */ |
1163 | case EARLY_PLATFORM_ID_UNSET: | |
1164 | match = NULL; | |
1165 | break; | |
1166 | default: | |
1167 | match = early_platform_match(epdrv, match_id); | |
1168 | } | |
1169 | ||
1170 | if (match) { | |
a636ee7f PM |
1171 | /* |
1172 | * Set up a sensible init_name to enable | |
1173 | * dev_name() and others to be used before the | |
1174 | * rest of the driver core is initialized. | |
1175 | */ | |
06fe53be | 1176 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1177 | if (match->id != -1) |
bd05086b PM |
1178 | match->dev.init_name = |
1179 | kasprintf(GFP_KERNEL, "%s.%d", | |
1180 | match->name, | |
1181 | match->id); | |
a636ee7f | 1182 | else |
bd05086b PM |
1183 | match->dev.init_name = |
1184 | kasprintf(GFP_KERNEL, "%s", | |
1185 | match->name); | |
a636ee7f | 1186 | |
a636ee7f PM |
1187 | if (!match->dev.init_name) |
1188 | return -ENOMEM; | |
1189 | } | |
bd05086b | 1190 | |
13977091 | 1191 | if (epdrv->pdrv->probe(match)) |
0258e182 FP |
1192 | pr_warn("%s: unable to probe %s early.\n", |
1193 | class_str, match->name); | |
13977091 MD |
1194 | else |
1195 | n++; | |
1196 | } | |
1197 | ||
1198 | if (n >= nr_probe) | |
1199 | break; | |
1200 | } | |
1201 | ||
1202 | if (left) | |
1203 | return n; | |
1204 | else | |
1205 | return -ENODEV; | |
1206 | } | |
1207 | ||
1208 | /** | |
4d26e139 | 1209 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1210 | * @class_str: string to identify early platform driver class |
1211 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1212 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1213 | * |
1214 | * Used by architecture code to probe registered early platform drivers | |
1215 | * within a certain class. For probe to happen a registered early platform | |
1216 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1217 | */ |
1218 | int __init early_platform_driver_probe(char *class_str, | |
1219 | int nr_probe, | |
1220 | int user_only) | |
1221 | { | |
1222 | int k, n, i; | |
1223 | ||
1224 | n = 0; | |
1225 | for (i = -2; n < nr_probe; i++) { | |
1226 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1227 | ||
1228 | if (k < 0) | |
1229 | break; | |
1230 | ||
1231 | n += k; | |
1232 | ||
1233 | if (user_only) | |
1234 | break; | |
1235 | } | |
1236 | ||
1237 | return n; | |
1238 | } | |
1239 | ||
1240 | /** | |
1241 | * early_platform_cleanup - clean up early platform code | |
1242 | */ | |
1243 | void __init early_platform_cleanup(void) | |
1244 | { | |
1245 | struct platform_device *pd, *pd2; | |
1246 | ||
1247 | /* clean up the devres list used to chain devices */ | |
1248 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1249 | dev.devres_head) { | |
1250 | list_del(&pd->dev.devres_head); | |
1251 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1252 | } | |
1253 | } | |
1254 |