Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * platform.c - platform 'pseudo' bus for legacy devices | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * Please see Documentation/driver-model/platform.txt for more | |
10 | * information. | |
11 | */ | |
12 | ||
daa41226 | 13 | #include <linux/string.h> |
d052d1be | 14 | #include <linux/platform_device.h> |
05212157 | 15 | #include <linux/of_device.h> |
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <linux/init.h> | |
18 | #include <linux/dma-mapping.h> | |
19 | #include <linux/bootmem.h> | |
20 | #include <linux/err.h> | |
4e57b681 | 21 | #include <linux/slab.h> |
9d730229 | 22 | #include <linux/pm_runtime.h> |
689ae231 | 23 | #include <linux/idr.h> |
91e56878 | 24 | #include <linux/acpi.h> |
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 | ||
1da177e4 | 32 | struct device platform_bus = { |
1e0b2cf9 | 33 | .init_name = "platform", |
1da177e4 | 34 | }; |
a96b2042 | 35 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 | 36 | |
a77ce816 KG |
37 | /** |
38 | * arch_setup_pdev_archdata - Allow manipulation of archdata before its used | |
7de636fa | 39 | * @pdev: platform device |
a77ce816 KG |
40 | * |
41 | * This is called before platform_device_add() such that any pdev_archdata may | |
42 | * be setup before the platform_notifier is called. So if a user needs to | |
43 | * manipulate any relevant information in the pdev_archdata they can do: | |
44 | * | |
b1d6d822 | 45 | * platform_device_alloc() |
0258e182 FP |
46 | * ... manipulate ... |
47 | * platform_device_add() | |
a77ce816 KG |
48 | * |
49 | * And if they don't care they can just call platform_device_register() and | |
50 | * everything will just work out. | |
51 | */ | |
52 | void __weak arch_setup_pdev_archdata(struct platform_device *pdev) | |
53 | { | |
54 | } | |
55 | ||
1da177e4 | 56 | /** |
4a3ad20c GKH |
57 | * platform_get_resource - get a resource for a device |
58 | * @dev: platform device | |
59 | * @type: resource type | |
60 | * @num: resource index | |
1da177e4 | 61 | */ |
4a3ad20c GKH |
62 | struct resource *platform_get_resource(struct platform_device *dev, |
63 | unsigned int type, unsigned int num) | |
1da177e4 LT |
64 | { |
65 | int i; | |
66 | ||
67 | for (i = 0; i < dev->num_resources; i++) { | |
68 | struct resource *r = &dev->resource[i]; | |
69 | ||
c9f66169 MD |
70 | if (type == resource_type(r) && num-- == 0) |
71 | return r; | |
1da177e4 LT |
72 | } |
73 | return NULL; | |
74 | } | |
a96b2042 | 75 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
76 | |
77 | /** | |
4a3ad20c GKH |
78 | * platform_get_irq - get an IRQ for a device |
79 | * @dev: platform device | |
80 | * @num: IRQ number index | |
1da177e4 LT |
81 | */ |
82 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
83 | { | |
5cf8f7db AL |
84 | #ifdef CONFIG_SPARC |
85 | /* sparc does not have irqs represented as IORESOURCE_IRQ resources */ | |
86 | if (!dev || num >= dev->archdata.num_irqs) | |
87 | return -ENXIO; | |
88 | return dev->archdata.irqs[num]; | |
89 | #else | |
1da177e4 LT |
90 | struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); |
91 | ||
305b3228 | 92 | return r ? r->start : -ENXIO; |
5cf8f7db | 93 | #endif |
1da177e4 | 94 | } |
a96b2042 | 95 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
96 | |
97 | /** | |
4a3ad20c GKH |
98 | * platform_get_resource_byname - get a resource for a device by name |
99 | * @dev: platform device | |
100 | * @type: resource type | |
101 | * @name: resource name | |
1da177e4 | 102 | */ |
4a3ad20c | 103 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
104 | unsigned int type, |
105 | const char *name) | |
1da177e4 LT |
106 | { |
107 | int i; | |
108 | ||
109 | for (i = 0; i < dev->num_resources; i++) { | |
110 | struct resource *r = &dev->resource[i]; | |
111 | ||
1b8cb929 PU |
112 | if (unlikely(!r->name)) |
113 | continue; | |
114 | ||
c9f66169 MD |
115 | if (type == resource_type(r) && !strcmp(r->name, name)) |
116 | return r; | |
1da177e4 LT |
117 | } |
118 | return NULL; | |
119 | } | |
a96b2042 | 120 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
121 | |
122 | /** | |
d6ff8551 | 123 | * platform_get_irq_byname - get an IRQ for a device by name |
4a3ad20c GKH |
124 | * @dev: platform device |
125 | * @name: IRQ name | |
1da177e4 | 126 | */ |
c0afe7ba | 127 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
1da177e4 | 128 | { |
4a3ad20c GKH |
129 | struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, |
130 | name); | |
1da177e4 | 131 | |
305b3228 | 132 | return r ? r->start : -ENXIO; |
1da177e4 | 133 | } |
a96b2042 | 134 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
135 | |
136 | /** | |
4a3ad20c GKH |
137 | * platform_add_devices - add a numbers of platform devices |
138 | * @devs: array of platform devices to add | |
139 | * @num: number of platform devices in array | |
1da177e4 LT |
140 | */ |
141 | int platform_add_devices(struct platform_device **devs, int num) | |
142 | { | |
143 | int i, ret = 0; | |
144 | ||
145 | for (i = 0; i < num; i++) { | |
146 | ret = platform_device_register(devs[i]); | |
147 | if (ret) { | |
148 | while (--i >= 0) | |
149 | platform_device_unregister(devs[i]); | |
150 | break; | |
151 | } | |
152 | } | |
153 | ||
154 | return ret; | |
155 | } | |
a96b2042 | 156 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 157 | |
37c12e74 RK |
158 | struct platform_object { |
159 | struct platform_device pdev; | |
160 | char name[1]; | |
161 | }; | |
162 | ||
1da177e4 | 163 | /** |
3c31f07a | 164 | * platform_device_put - destroy a platform device |
4a3ad20c | 165 | * @pdev: platform device to free |
37c12e74 | 166 | * |
4a3ad20c GKH |
167 | * Free all memory associated with a platform device. This function must |
168 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
169 | */ |
170 | void platform_device_put(struct platform_device *pdev) | |
171 | { | |
172 | if (pdev) | |
173 | put_device(&pdev->dev); | |
174 | } | |
175 | EXPORT_SYMBOL_GPL(platform_device_put); | |
176 | ||
177 | static void platform_device_release(struct device *dev) | |
178 | { | |
4a3ad20c GKH |
179 | struct platform_object *pa = container_of(dev, struct platform_object, |
180 | pdev.dev); | |
37c12e74 | 181 | |
7096d042 | 182 | of_device_node_put(&pa->pdev.dev); |
37c12e74 | 183 | kfree(pa->pdev.dev.platform_data); |
e710d7d5 | 184 | kfree(pa->pdev.mfd_cell); |
37c12e74 RK |
185 | kfree(pa->pdev.resource); |
186 | kfree(pa); | |
187 | } | |
188 | ||
189 | /** | |
3c31f07a | 190 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
191 | * @name: base name of the device we're adding |
192 | * @id: instance id | |
37c12e74 | 193 | * |
4a3ad20c GKH |
194 | * Create a platform device object which can have other objects attached |
195 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 196 | */ |
1359555e | 197 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
198 | { |
199 | struct platform_object *pa; | |
200 | ||
201 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); | |
202 | if (pa) { | |
203 | strcpy(pa->name, name); | |
204 | pa->pdev.name = pa->name; | |
205 | pa->pdev.id = id; | |
206 | device_initialize(&pa->pdev.dev); | |
207 | pa->pdev.dev.release = platform_device_release; | |
a77ce816 | 208 | arch_setup_pdev_archdata(&pa->pdev); |
37c12e74 RK |
209 | } |
210 | ||
93ce3061 | 211 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
212 | } |
213 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
214 | ||
215 | /** | |
3c31f07a | 216 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
217 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
218 | * @res: set of resources that needs to be allocated for the device | |
219 | * @num: number of resources | |
37c12e74 | 220 | * |
4a3ad20c GKH |
221 | * Add a copy of the resources to the platform device. The memory |
222 | * associated with the resources will be freed when the platform device is | |
223 | * released. | |
37c12e74 | 224 | */ |
4a3ad20c | 225 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 226 | const struct resource *res, unsigned int num) |
37c12e74 | 227 | { |
cea89623 | 228 | struct resource *r = NULL; |
37c12e74 | 229 | |
cea89623 UKK |
230 | if (res) { |
231 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); | |
232 | if (!r) | |
233 | return -ENOMEM; | |
37c12e74 | 234 | } |
cea89623 | 235 | |
4a03d6f7 | 236 | kfree(pdev->resource); |
cea89623 UKK |
237 | pdev->resource = r; |
238 | pdev->num_resources = num; | |
239 | return 0; | |
37c12e74 RK |
240 | } |
241 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
242 | ||
243 | /** | |
3c31f07a | 244 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
245 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
246 | * @data: platform specific data for this platform device | |
247 | * @size: size of platform specific data | |
37c12e74 | 248 | * |
4a3ad20c GKH |
249 | * Add a copy of platform specific data to the platform device's |
250 | * platform_data pointer. The memory associated with the platform data | |
251 | * will be freed when the platform device is released. | |
37c12e74 | 252 | */ |
4a3ad20c GKH |
253 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
254 | size_t size) | |
37c12e74 | 255 | { |
27a33f9e | 256 | void *d = NULL; |
5cfc64ce | 257 | |
27a33f9e UKK |
258 | if (data) { |
259 | d = kmemdup(data, size, GFP_KERNEL); | |
260 | if (!d) | |
261 | return -ENOMEM; | |
37c12e74 | 262 | } |
27a33f9e | 263 | |
251e031d | 264 | kfree(pdev->dev.platform_data); |
27a33f9e UKK |
265 | pdev->dev.platform_data = d; |
266 | return 0; | |
37c12e74 RK |
267 | } |
268 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
269 | ||
270 | /** | |
4a3ad20c GKH |
271 | * platform_device_add - add a platform device to device hierarchy |
272 | * @pdev: platform device we're adding | |
1da177e4 | 273 | * |
4a3ad20c GKH |
274 | * This is part 2 of platform_device_register(), though may be called |
275 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 276 | */ |
37c12e74 | 277 | int platform_device_add(struct platform_device *pdev) |
1da177e4 | 278 | { |
689ae231 | 279 | int i, ret; |
1da177e4 LT |
280 | |
281 | if (!pdev) | |
282 | return -EINVAL; | |
283 | ||
284 | if (!pdev->dev.parent) | |
285 | pdev->dev.parent = &platform_bus; | |
286 | ||
287 | pdev->dev.bus = &platform_bus_type; | |
288 | ||
689ae231 JD |
289 | switch (pdev->id) { |
290 | default: | |
1e0b2cf9 | 291 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
689ae231 JD |
292 | break; |
293 | case PLATFORM_DEVID_NONE: | |
acc0e90f | 294 | dev_set_name(&pdev->dev, "%s", pdev->name); |
689ae231 JD |
295 | break; |
296 | case PLATFORM_DEVID_AUTO: | |
297 | /* | |
298 | * Automatically allocated device ID. We mark it as such so | |
299 | * that we remember it must be freed, and we append a suffix | |
300 | * to avoid namespace collision with explicit IDs. | |
301 | */ | |
302 | ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL); | |
303 | if (ret < 0) | |
304 | goto err_out; | |
305 | pdev->id = ret; | |
306 | pdev->id_auto = true; | |
307 | dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); | |
308 | break; | |
309 | } | |
1da177e4 LT |
310 | |
311 | for (i = 0; i < pdev->num_resources; i++) { | |
312 | struct resource *p, *r = &pdev->resource[i]; | |
313 | ||
314 | if (r->name == NULL) | |
1e0b2cf9 | 315 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
316 | |
317 | p = r->parent; | |
318 | if (!p) { | |
c9f66169 | 319 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 320 | p = &iomem_resource; |
c9f66169 | 321 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
322 | p = &ioport_resource; |
323 | } | |
324 | ||
d960bb4d | 325 | if (p && insert_resource(p, r)) { |
0258e182 | 326 | dev_err(&pdev->dev, "failed to claim resource %d\n", i); |
1da177e4 LT |
327 | ret = -EBUSY; |
328 | goto failed; | |
329 | } | |
330 | } | |
331 | ||
332 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 333 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 334 | |
e3915532 | 335 | ret = device_add(&pdev->dev); |
1da177e4 LT |
336 | if (ret == 0) |
337 | return ret; | |
338 | ||
339 | failed: | |
689ae231 JD |
340 | if (pdev->id_auto) { |
341 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
342 | pdev->id = PLATFORM_DEVID_AUTO; | |
343 | } | |
344 | ||
c9f66169 MD |
345 | while (--i >= 0) { |
346 | struct resource *r = &pdev->resource[i]; | |
347 | unsigned long type = resource_type(r); | |
348 | ||
349 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
350 | release_resource(r); | |
351 | } | |
352 | ||
689ae231 | 353 | err_out: |
1da177e4 LT |
354 | return ret; |
355 | } | |
37c12e74 RK |
356 | EXPORT_SYMBOL_GPL(platform_device_add); |
357 | ||
358 | /** | |
4a3ad20c GKH |
359 | * platform_device_del - remove a platform-level device |
360 | * @pdev: platform device we're removing | |
1da177e4 | 361 | * |
4a3ad20c GKH |
362 | * Note that this function will also release all memory- and port-based |
363 | * resources owned by the device (@dev->resource). This function must | |
364 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 365 | */ |
93ce3061 | 366 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
367 | { |
368 | int i; | |
369 | ||
370 | if (pdev) { | |
dc4c15d4 JD |
371 | device_del(&pdev->dev); |
372 | ||
689ae231 JD |
373 | if (pdev->id_auto) { |
374 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
375 | pdev->id = PLATFORM_DEVID_AUTO; | |
376 | } | |
377 | ||
1da177e4 LT |
378 | for (i = 0; i < pdev->num_resources; i++) { |
379 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
380 | unsigned long type = resource_type(r); |
381 | ||
382 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
383 | release_resource(r); |
384 | } | |
1da177e4 LT |
385 | } |
386 | } | |
93ce3061 DT |
387 | EXPORT_SYMBOL_GPL(platform_device_del); |
388 | ||
389 | /** | |
4a3ad20c GKH |
390 | * platform_device_register - add a platform-level device |
391 | * @pdev: platform device we're adding | |
93ce3061 | 392 | */ |
4a3ad20c | 393 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
394 | { |
395 | device_initialize(&pdev->dev); | |
a77ce816 | 396 | arch_setup_pdev_archdata(pdev); |
93ce3061 DT |
397 | return platform_device_add(pdev); |
398 | } | |
a96b2042 | 399 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
400 | |
401 | /** | |
4a3ad20c GKH |
402 | * platform_device_unregister - unregister a platform-level device |
403 | * @pdev: platform device we're unregistering | |
93ce3061 | 404 | * |
4a3ad20c GKH |
405 | * Unregistration is done in 2 steps. First we release all resources |
406 | * and remove it from the subsystem, then we drop reference count by | |
407 | * calling platform_device_put(). | |
93ce3061 | 408 | */ |
4a3ad20c | 409 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
410 | { |
411 | platform_device_del(pdev); | |
412 | platform_device_put(pdev); | |
413 | } | |
a96b2042 | 414 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 415 | |
1da177e4 | 416 | /** |
01dcc60a | 417 | * platform_device_register_full - add a platform-level device with |
44f28bde | 418 | * resources and platform-specific data |
49a4ec18 | 419 | * |
01dcc60a | 420 | * @pdevinfo: data used to create device |
d8bf2540 | 421 | * |
f0eae0ed | 422 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 423 | */ |
01dcc60a | 424 | struct platform_device *platform_device_register_full( |
5a3072be | 425 | const struct platform_device_info *pdevinfo) |
d8bf2540 | 426 | { |
44f28bde | 427 | int ret = -ENOMEM; |
d8bf2540 | 428 | struct platform_device *pdev; |
d8bf2540 | 429 | |
01dcc60a | 430 | pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
44f28bde | 431 | if (!pdev) |
01dcc60a UKK |
432 | goto err_alloc; |
433 | ||
434 | pdev->dev.parent = pdevinfo->parent; | |
7b199811 | 435 | ACPI_COMPANION_SET(&pdev->dev, pdevinfo->acpi_node.companion); |
01dcc60a UKK |
436 | |
437 | if (pdevinfo->dma_mask) { | |
438 | /* | |
439 | * This memory isn't freed when the device is put, | |
440 | * I don't have a nice idea for that though. Conceptually | |
441 | * dma_mask in struct device should not be a pointer. | |
442 | * See http://thread.gmane.org/gmane.linux.kernel.pci/9081 | |
443 | */ | |
444 | pdev->dev.dma_mask = | |
445 | kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); | |
446 | if (!pdev->dev.dma_mask) | |
447 | goto err; | |
448 | ||
449 | *pdev->dev.dma_mask = pdevinfo->dma_mask; | |
450 | pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; | |
451 | } | |
d8bf2540 | 452 | |
01dcc60a UKK |
453 | ret = platform_device_add_resources(pdev, |
454 | pdevinfo->res, pdevinfo->num_res); | |
807508c8 AV |
455 | if (ret) |
456 | goto err; | |
44f28bde | 457 | |
01dcc60a UKK |
458 | ret = platform_device_add_data(pdev, |
459 | pdevinfo->data, pdevinfo->size_data); | |
807508c8 AV |
460 | if (ret) |
461 | goto err; | |
d8bf2540 | 462 | |
44f28bde UKK |
463 | ret = platform_device_add(pdev); |
464 | if (ret) { | |
465 | err: | |
7b199811 | 466 | ACPI_COMPANION_SET(&pdev->dev, NULL); |
01dcc60a UKK |
467 | kfree(pdev->dev.dma_mask); |
468 | ||
469 | err_alloc: | |
44f28bde UKK |
470 | platform_device_put(pdev); |
471 | return ERR_PTR(ret); | |
472 | } | |
d8bf2540 DB |
473 | |
474 | return pdev; | |
d8bf2540 | 475 | } |
01dcc60a | 476 | EXPORT_SYMBOL_GPL(platform_device_register_full); |
d8bf2540 | 477 | |
00d3dcdd RK |
478 | static int platform_drv_probe(struct device *_dev) |
479 | { | |
480 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
481 | struct platform_device *dev = to_platform_device(_dev); | |
94d76d5d | 482 | int ret; |
00d3dcdd | 483 | |
9383f4c6 | 484 | acpi_dev_pm_attach(_dev, true); |
94d76d5d RW |
485 | |
486 | ret = drv->probe(dev); | |
9383f4c6 | 487 | if (ret) |
94d76d5d RW |
488 | acpi_dev_pm_detach(_dev, true); |
489 | ||
3f9120b0 JH |
490 | if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) { |
491 | dev_warn(_dev, "probe deferral not supported\n"); | |
492 | ret = -ENXIO; | |
493 | } | |
494 | ||
94d76d5d | 495 | return ret; |
00d3dcdd RK |
496 | } |
497 | ||
c67334fb DB |
498 | static int platform_drv_probe_fail(struct device *_dev) |
499 | { | |
500 | return -ENXIO; | |
501 | } | |
502 | ||
00d3dcdd RK |
503 | static int platform_drv_remove(struct device *_dev) |
504 | { | |
505 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
506 | struct platform_device *dev = to_platform_device(_dev); | |
94d76d5d | 507 | int ret; |
00d3dcdd | 508 | |
94d76d5d | 509 | ret = drv->remove(dev); |
9383f4c6 | 510 | acpi_dev_pm_detach(_dev, true); |
94d76d5d RW |
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); | |
9383f4c6 | 521 | acpi_dev_pm_detach(_dev, true); |
00d3dcdd RK |
522 | } |
523 | ||
00d3dcdd | 524 | /** |
9447057e | 525 | * __platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 526 | * @drv: platform driver structure |
08801f96 | 527 | * @owner: owning module/driver |
00d3dcdd | 528 | */ |
9447057e LC |
529 | int __platform_driver_register(struct platform_driver *drv, |
530 | struct module *owner) | |
00d3dcdd | 531 | { |
9447057e | 532 | drv->driver.owner = owner; |
00d3dcdd RK |
533 | drv->driver.bus = &platform_bus_type; |
534 | if (drv->probe) | |
535 | drv->driver.probe = platform_drv_probe; | |
536 | if (drv->remove) | |
537 | drv->driver.remove = platform_drv_remove; | |
538 | if (drv->shutdown) | |
539 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 540 | |
00d3dcdd RK |
541 | return driver_register(&drv->driver); |
542 | } | |
9447057e | 543 | EXPORT_SYMBOL_GPL(__platform_driver_register); |
00d3dcdd RK |
544 | |
545 | /** | |
3c31f07a | 546 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 547 | * @drv: platform driver structure |
00d3dcdd RK |
548 | */ |
549 | void platform_driver_unregister(struct platform_driver *drv) | |
550 | { | |
551 | driver_unregister(&drv->driver); | |
552 | } | |
553 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
554 | ||
c67334fb DB |
555 | /** |
556 | * platform_driver_probe - register driver for non-hotpluggable device | |
557 | * @drv: platform driver structure | |
3f9120b0 | 558 | * @probe: the driver probe routine, probably from an __init section |
c67334fb DB |
559 | * |
560 | * Use this instead of platform_driver_register() when you know the device | |
561 | * is not hotpluggable and has already been registered, and you want to | |
562 | * remove its run-once probe() infrastructure from memory after the driver | |
563 | * has bound to the device. | |
564 | * | |
565 | * One typical use for this would be with drivers for controllers integrated | |
566 | * into system-on-chip processors, where the controller devices have been | |
567 | * configured as part of board setup. | |
568 | * | |
3f9120b0 | 569 | * Note that this is incompatible with deferred probing. |
647c86d0 | 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 | ||
3f9120b0 JH |
579 | /* |
580 | * Prevent driver from requesting probe deferral to avoid further | |
581 | * futile probe attempts. | |
582 | */ | |
583 | drv->prevent_deferred_probe = true; | |
584 | ||
1a6f2a75 DT |
585 | /* make sure driver won't have bind/unbind attributes */ |
586 | drv->driver.suppress_bind_attrs = true; | |
587 | ||
c67334fb DB |
588 | /* temporary section violation during probe() */ |
589 | drv->probe = probe; | |
590 | retval = code = platform_driver_register(drv); | |
591 | ||
1a6f2a75 DT |
592 | /* |
593 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
594 | * the list of drivers in order to probe new devices. Check to see |
595 | * if the probe was successful, and make sure any forced probes of | |
596 | * new devices fail. | |
597 | */ | |
d79d3244 | 598 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb | 599 | drv->probe = NULL; |
e5dd1278 | 600 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
601 | retval = -ENODEV; |
602 | drv->driver.probe = platform_drv_probe_fail; | |
d79d3244 | 603 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
604 | |
605 | if (code != retval) | |
606 | platform_driver_unregister(drv); | |
607 | return retval; | |
608 | } | |
609 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 610 | |
ecdf6ceb DT |
611 | /** |
612 | * platform_create_bundle - register driver and create corresponding device | |
613 | * @driver: platform driver structure | |
614 | * @probe: the driver probe routine, probably from an __init section | |
615 | * @res: set of resources that needs to be allocated for the device | |
616 | * @n_res: number of resources | |
617 | * @data: platform specific data for this platform device | |
618 | * @size: size of platform specific data | |
619 | * | |
620 | * Use this in legacy-style modules that probe hardware directly and | |
621 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
622 | * |
623 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb DT |
624 | */ |
625 | struct platform_device * __init_or_module platform_create_bundle( | |
626 | struct platform_driver *driver, | |
627 | int (*probe)(struct platform_device *), | |
628 | struct resource *res, unsigned int n_res, | |
629 | const void *data, size_t size) | |
630 | { | |
631 | struct platform_device *pdev; | |
632 | int error; | |
633 | ||
634 | pdev = platform_device_alloc(driver->driver.name, -1); | |
635 | if (!pdev) { | |
636 | error = -ENOMEM; | |
637 | goto err_out; | |
638 | } | |
639 | ||
807508c8 AV |
640 | error = platform_device_add_resources(pdev, res, n_res); |
641 | if (error) | |
642 | goto err_pdev_put; | |
ecdf6ceb | 643 | |
807508c8 AV |
644 | error = platform_device_add_data(pdev, data, size); |
645 | if (error) | |
646 | goto err_pdev_put; | |
ecdf6ceb DT |
647 | |
648 | error = platform_device_add(pdev); | |
649 | if (error) | |
650 | goto err_pdev_put; | |
651 | ||
652 | error = platform_driver_probe(driver, probe); | |
653 | if (error) | |
654 | goto err_pdev_del; | |
655 | ||
656 | return pdev; | |
657 | ||
658 | err_pdev_del: | |
659 | platform_device_del(pdev); | |
660 | err_pdev_put: | |
661 | platform_device_put(pdev); | |
662 | err_out: | |
663 | return ERR_PTR(error); | |
664 | } | |
665 | EXPORT_SYMBOL_GPL(platform_create_bundle); | |
666 | ||
a0245f7a DB |
667 | /* modalias support enables more hands-off userspace setup: |
668 | * (a) environment variable lets new-style hotplug events work once system is | |
669 | * fully running: "modprobe $MODALIAS" | |
670 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
671 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
672 | */ | |
4a3ad20c GKH |
673 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
674 | char *buf) | |
a0245f7a DB |
675 | { |
676 | struct platform_device *pdev = to_platform_device(dev); | |
8c4ff6d0 ZR |
677 | int len; |
678 | ||
b9f73067 ZR |
679 | len = of_device_get_modalias(dev, buf, PAGE_SIZE -1); |
680 | if (len != -ENODEV) | |
681 | return len; | |
682 | ||
8c4ff6d0 ZR |
683 | len = acpi_device_modalias(dev, buf, PAGE_SIZE -1); |
684 | if (len != -ENODEV) | |
685 | return len; | |
686 | ||
687 | len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); | |
a0245f7a DB |
688 | |
689 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
690 | } | |
d06262e5 | 691 | static DEVICE_ATTR_RO(modalias); |
a0245f7a | 692 | |
d06262e5 GKH |
693 | static struct attribute *platform_dev_attrs[] = { |
694 | &dev_attr_modalias.attr, | |
695 | NULL, | |
a0245f7a | 696 | }; |
d06262e5 | 697 | ATTRIBUTE_GROUPS(platform_dev); |
a0245f7a | 698 | |
7eff2e7a | 699 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
700 | { |
701 | struct platform_device *pdev = to_platform_device(dev); | |
eca39301 GL |
702 | int rc; |
703 | ||
704 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
0258e182 | 705 | rc = of_device_uevent_modalias(dev, env); |
eca39301 GL |
706 | if (rc != -ENODEV) |
707 | return rc; | |
a0245f7a | 708 | |
8c4ff6d0 ZR |
709 | rc = acpi_device_uevent_modalias(dev, env); |
710 | if (rc != -ENODEV) | |
711 | return rc; | |
712 | ||
57fee4a5 | 713 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
0a26813c | 714 | pdev->name); |
a0245f7a DB |
715 | return 0; |
716 | } | |
717 | ||
57fee4a5 | 718 | static const struct platform_device_id *platform_match_id( |
831fad2f | 719 | const struct platform_device_id *id, |
57fee4a5 EM |
720 | struct platform_device *pdev) |
721 | { | |
722 | while (id->name[0]) { | |
723 | if (strcmp(pdev->name, id->name) == 0) { | |
724 | pdev->id_entry = id; | |
725 | return id; | |
726 | } | |
727 | id++; | |
728 | } | |
729 | return NULL; | |
730 | } | |
731 | ||
1da177e4 | 732 | /** |
4a3ad20c GKH |
733 | * platform_match - bind platform device to platform driver. |
734 | * @dev: device. | |
735 | * @drv: driver. | |
1da177e4 | 736 | * |
4a3ad20c GKH |
737 | * Platform device IDs are assumed to be encoded like this: |
738 | * "<name><instance>", where <name> is a short description of the type of | |
739 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
740 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
741 | * "<name>". So, extract the <name> from the platform_device structure, | |
742 | * and compare it against the name of the driver. Return whether they match | |
743 | * or not. | |
1da177e4 | 744 | */ |
4a3ad20c | 745 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 746 | { |
71b3e0c1 | 747 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
748 | struct platform_driver *pdrv = to_platform_driver(drv); |
749 | ||
05212157 GL |
750 | /* Attempt an OF style match first */ |
751 | if (of_driver_match_device(dev, drv)) | |
752 | return 1; | |
753 | ||
91e56878 MW |
754 | /* Then try ACPI style match */ |
755 | if (acpi_driver_match_device(dev, drv)) | |
756 | return 1; | |
757 | ||
05212157 | 758 | /* Then try to match against the id table */ |
57fee4a5 EM |
759 | if (pdrv->id_table) |
760 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 761 | |
57fee4a5 | 762 | /* fall-back to driver name match */ |
1e0b2cf9 | 763 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
764 | } |
765 | ||
25e18499 RW |
766 | #ifdef CONFIG_PM_SLEEP |
767 | ||
768 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 769 | { |
783ea7d4 MD |
770 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
771 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
772 | int ret = 0; |
773 | ||
783ea7d4 MD |
774 | if (dev->driver && pdrv->suspend) |
775 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
776 | |
777 | return ret; | |
778 | } | |
779 | ||
25e18499 | 780 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 781 | { |
783ea7d4 MD |
782 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
783 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
784 | int ret = 0; |
785 | ||
783ea7d4 MD |
786 | if (dev->driver && pdrv->resume) |
787 | ret = pdrv->resume(pdev); | |
9480e307 | 788 | |
1da177e4 LT |
789 | return ret; |
790 | } | |
791 | ||
69c9dd1e | 792 | #endif /* CONFIG_PM_SLEEP */ |
9d730229 | 793 | |
25e18499 RW |
794 | #ifdef CONFIG_SUSPEND |
795 | ||
69c9dd1e | 796 | int platform_pm_suspend(struct device *dev) |
25e18499 RW |
797 | { |
798 | struct device_driver *drv = dev->driver; | |
799 | int ret = 0; | |
800 | ||
adf09493 RW |
801 | if (!drv) |
802 | return 0; | |
803 | ||
804 | if (drv->pm) { | |
25e18499 RW |
805 | if (drv->pm->suspend) |
806 | ret = drv->pm->suspend(dev); | |
807 | } else { | |
808 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
809 | } | |
810 | ||
811 | return ret; | |
812 | } | |
813 | ||
69c9dd1e | 814 | int platform_pm_resume(struct device *dev) |
25e18499 RW |
815 | { |
816 | struct device_driver *drv = dev->driver; | |
817 | int ret = 0; | |
818 | ||
adf09493 RW |
819 | if (!drv) |
820 | return 0; | |
821 | ||
822 | if (drv->pm) { | |
25e18499 RW |
823 | if (drv->pm->resume) |
824 | ret = drv->pm->resume(dev); | |
825 | } else { | |
826 | ret = platform_legacy_resume(dev); | |
827 | } | |
828 | ||
829 | return ret; | |
830 | } | |
831 | ||
69c9dd1e | 832 | #endif /* CONFIG_SUSPEND */ |
25e18499 | 833 | |
1f112cee | 834 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 | 835 | |
69c9dd1e | 836 | int platform_pm_freeze(struct device *dev) |
25e18499 RW |
837 | { |
838 | struct device_driver *drv = dev->driver; | |
839 | int ret = 0; | |
840 | ||
841 | if (!drv) | |
842 | return 0; | |
843 | ||
844 | if (drv->pm) { | |
845 | if (drv->pm->freeze) | |
846 | ret = drv->pm->freeze(dev); | |
847 | } else { | |
848 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
849 | } | |
850 | ||
851 | return ret; | |
852 | } | |
853 | ||
69c9dd1e | 854 | int platform_pm_thaw(struct device *dev) |
25e18499 RW |
855 | { |
856 | struct device_driver *drv = dev->driver; | |
857 | int ret = 0; | |
858 | ||
adf09493 RW |
859 | if (!drv) |
860 | return 0; | |
861 | ||
862 | if (drv->pm) { | |
25e18499 RW |
863 | if (drv->pm->thaw) |
864 | ret = drv->pm->thaw(dev); | |
865 | } else { | |
866 | ret = platform_legacy_resume(dev); | |
867 | } | |
868 | ||
869 | return ret; | |
870 | } | |
871 | ||
69c9dd1e | 872 | int platform_pm_poweroff(struct device *dev) |
25e18499 RW |
873 | { |
874 | struct device_driver *drv = dev->driver; | |
875 | int ret = 0; | |
876 | ||
adf09493 RW |
877 | if (!drv) |
878 | return 0; | |
879 | ||
880 | if (drv->pm) { | |
25e18499 RW |
881 | if (drv->pm->poweroff) |
882 | ret = drv->pm->poweroff(dev); | |
883 | } else { | |
884 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
885 | } | |
886 | ||
887 | return ret; | |
888 | } | |
889 | ||
69c9dd1e | 890 | int platform_pm_restore(struct device *dev) |
25e18499 RW |
891 | { |
892 | struct device_driver *drv = dev->driver; | |
893 | int ret = 0; | |
894 | ||
adf09493 RW |
895 | if (!drv) |
896 | return 0; | |
897 | ||
898 | if (drv->pm) { | |
25e18499 RW |
899 | if (drv->pm->restore) |
900 | ret = drv->pm->restore(dev); | |
901 | } else { | |
902 | ret = platform_legacy_resume(dev); | |
903 | } | |
904 | ||
905 | return ret; | |
906 | } | |
907 | ||
69c9dd1e | 908 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 909 | |
d9ab7716 | 910 | static const struct dev_pm_ops platform_dev_pm_ops = { |
8b313a38 RW |
911 | .runtime_suspend = pm_generic_runtime_suspend, |
912 | .runtime_resume = pm_generic_runtime_resume, | |
69c9dd1e | 913 | USE_PLATFORM_PM_SLEEP_OPS |
25e18499 RW |
914 | }; |
915 | ||
1da177e4 LT |
916 | struct bus_type platform_bus_type = { |
917 | .name = "platform", | |
d06262e5 | 918 | .dev_groups = platform_dev_groups, |
1da177e4 | 919 | .match = platform_match, |
a0245f7a | 920 | .uevent = platform_uevent, |
9d730229 | 921 | .pm = &platform_dev_pm_ops, |
1da177e4 | 922 | }; |
a96b2042 | 923 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
924 | |
925 | int __init platform_bus_init(void) | |
926 | { | |
fbfb1445 CH |
927 | int error; |
928 | ||
13977091 MD |
929 | early_platform_cleanup(); |
930 | ||
fbfb1445 CH |
931 | error = device_register(&platform_bus); |
932 | if (error) | |
933 | return error; | |
934 | error = bus_register(&platform_bus_type); | |
935 | if (error) | |
936 | device_unregister(&platform_bus); | |
937 | return error; | |
1da177e4 LT |
938 | } |
939 | ||
940 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
941 | u64 dma_get_required_mask(struct device *dev) | |
942 | { | |
943 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
944 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
945 | u64 mask; | |
946 | ||
947 | if (!high_totalram) { | |
948 | /* convert to mask just covering totalram */ | |
949 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
950 | low_totalram += low_totalram - 1; | |
951 | mask = low_totalram; | |
952 | } else { | |
953 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
954 | high_totalram += high_totalram - 1; | |
955 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
956 | } | |
e88a0c2c | 957 | return mask; |
1da177e4 LT |
958 | } |
959 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
960 | #endif | |
13977091 MD |
961 | |
962 | static __initdata LIST_HEAD(early_platform_driver_list); | |
963 | static __initdata LIST_HEAD(early_platform_device_list); | |
964 | ||
965 | /** | |
4d26e139 | 966 | * early_platform_driver_register - register early platform driver |
d86c1302 | 967 | * @epdrv: early_platform driver structure |
13977091 | 968 | * @buf: string passed from early_param() |
4d26e139 MD |
969 | * |
970 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
971 | */ |
972 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
973 | char *buf) | |
974 | { | |
c60e0504 | 975 | char *tmp; |
13977091 MD |
976 | int n; |
977 | ||
978 | /* Simply add the driver to the end of the global list. | |
979 | * Drivers will by default be put on the list in compiled-in order. | |
980 | */ | |
981 | if (!epdrv->list.next) { | |
982 | INIT_LIST_HEAD(&epdrv->list); | |
983 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
984 | } | |
985 | ||
986 | /* If the user has specified device then make sure the driver | |
987 | * gets prioritized. The driver of the last device specified on | |
988 | * command line will be put first on the list. | |
989 | */ | |
990 | n = strlen(epdrv->pdrv->driver.name); | |
991 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
992 | list_move(&epdrv->list, &early_platform_driver_list); | |
993 | ||
c60e0504 MD |
994 | /* Allow passing parameters after device name */ |
995 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 996 | epdrv->requested_id = -1; |
c60e0504 MD |
997 | else { |
998 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
999 | &tmp, 10); | |
1000 | ||
1001 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
1002 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
1003 | n = 0; | |
1004 | } else | |
1005 | n += strcspn(&buf[n + 1], ",") + 1; | |
1006 | } | |
1007 | ||
1008 | if (buf[n] == ',') | |
1009 | n++; | |
1010 | ||
1011 | if (epdrv->bufsize) { | |
1012 | memcpy(epdrv->buffer, &buf[n], | |
1013 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
1014 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
1015 | } | |
13977091 MD |
1016 | } |
1017 | ||
1018 | return 0; | |
1019 | } | |
1020 | ||
1021 | /** | |
4d26e139 | 1022 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
1023 | * @devs: array of early platform devices to add |
1024 | * @num: number of early platform devices in array | |
4d26e139 MD |
1025 | * |
1026 | * Used by early architecture code to register early platform devices and | |
1027 | * their platform data. | |
13977091 MD |
1028 | */ |
1029 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1030 | { | |
1031 | struct device *dev; | |
1032 | int i; | |
1033 | ||
1034 | /* simply add the devices to list */ | |
1035 | for (i = 0; i < num; i++) { | |
1036 | dev = &devs[i]->dev; | |
1037 | ||
1038 | if (!dev->devres_head.next) { | |
bed2b42d | 1039 | pm_runtime_early_init(dev); |
13977091 MD |
1040 | INIT_LIST_HEAD(&dev->devres_head); |
1041 | list_add_tail(&dev->devres_head, | |
1042 | &early_platform_device_list); | |
1043 | } | |
1044 | } | |
1045 | } | |
1046 | ||
1047 | /** | |
4d26e139 | 1048 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 1049 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
1050 | * |
1051 | * Used by architecture code to register all early platform drivers | |
1052 | * for a certain class. If omitted then only early platform drivers | |
1053 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
1054 | */ |
1055 | void __init early_platform_driver_register_all(char *class_str) | |
1056 | { | |
1057 | /* The "class_str" parameter may or may not be present on the kernel | |
1058 | * command line. If it is present then there may be more than one | |
1059 | * matching parameter. | |
1060 | * | |
1061 | * Since we register our early platform drivers using early_param() | |
1062 | * we need to make sure that they also get registered in the case | |
1063 | * when the parameter is missing from the kernel command line. | |
1064 | * | |
1065 | * We use parse_early_options() to make sure the early_param() gets | |
1066 | * called at least once. The early_param() may be called more than | |
1067 | * once since the name of the preferred device may be specified on | |
1068 | * the kernel command line. early_platform_driver_register() handles | |
1069 | * this case for us. | |
1070 | */ | |
1071 | parse_early_options(class_str); | |
1072 | } | |
1073 | ||
1074 | /** | |
4d26e139 | 1075 | * early_platform_match - find early platform device matching driver |
d86c1302 | 1076 | * @epdrv: early platform driver structure |
13977091 MD |
1077 | * @id: id to match against |
1078 | */ | |
a8257910 | 1079 | static struct platform_device * __init |
13977091 MD |
1080 | early_platform_match(struct early_platform_driver *epdrv, int id) |
1081 | { | |
1082 | struct platform_device *pd; | |
1083 | ||
1084 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1085 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1086 | if (pd->id == id) | |
1087 | return pd; | |
1088 | ||
1089 | return NULL; | |
1090 | } | |
1091 | ||
1092 | /** | |
4d26e139 | 1093 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1094 | * @epdrv: early platform driver structure |
13977091 MD |
1095 | * @id: return true if id or above exists |
1096 | */ | |
a8257910 | 1097 | static int __init early_platform_left(struct early_platform_driver *epdrv, |
13977091 MD |
1098 | int id) |
1099 | { | |
1100 | struct platform_device *pd; | |
1101 | ||
1102 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1103 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1104 | if (pd->id >= id) | |
1105 | return 1; | |
1106 | ||
1107 | return 0; | |
1108 | } | |
1109 | ||
1110 | /** | |
4d26e139 | 1111 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1112 | * @class_str: string to identify early platform driver class |
1113 | * @id: id to match against | |
1114 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1115 | */ | |
1116 | static int __init early_platform_driver_probe_id(char *class_str, | |
1117 | int id, | |
1118 | int nr_probe) | |
1119 | { | |
1120 | struct early_platform_driver *epdrv; | |
1121 | struct platform_device *match; | |
1122 | int match_id; | |
1123 | int n = 0; | |
1124 | int left = 0; | |
1125 | ||
1126 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1127 | /* only use drivers matching our class_str */ | |
1128 | if (strcmp(class_str, epdrv->class_str)) | |
1129 | continue; | |
1130 | ||
1131 | if (id == -2) { | |
1132 | match_id = epdrv->requested_id; | |
1133 | left = 1; | |
1134 | ||
1135 | } else { | |
1136 | match_id = id; | |
1137 | left += early_platform_left(epdrv, id); | |
1138 | ||
1139 | /* skip requested id */ | |
1140 | switch (epdrv->requested_id) { | |
1141 | case EARLY_PLATFORM_ID_ERROR: | |
1142 | case EARLY_PLATFORM_ID_UNSET: | |
1143 | break; | |
1144 | default: | |
1145 | if (epdrv->requested_id == id) | |
1146 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1147 | } | |
1148 | } | |
1149 | ||
1150 | switch (match_id) { | |
1151 | case EARLY_PLATFORM_ID_ERROR: | |
0258e182 FP |
1152 | pr_warn("%s: unable to parse %s parameter\n", |
1153 | class_str, epdrv->pdrv->driver.name); | |
13977091 MD |
1154 | /* fall-through */ |
1155 | case EARLY_PLATFORM_ID_UNSET: | |
1156 | match = NULL; | |
1157 | break; | |
1158 | default: | |
1159 | match = early_platform_match(epdrv, match_id); | |
1160 | } | |
1161 | ||
1162 | if (match) { | |
a636ee7f PM |
1163 | /* |
1164 | * Set up a sensible init_name to enable | |
1165 | * dev_name() and others to be used before the | |
1166 | * rest of the driver core is initialized. | |
1167 | */ | |
06fe53be | 1168 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1169 | if (match->id != -1) |
bd05086b PM |
1170 | match->dev.init_name = |
1171 | kasprintf(GFP_KERNEL, "%s.%d", | |
1172 | match->name, | |
1173 | match->id); | |
a636ee7f | 1174 | else |
bd05086b PM |
1175 | match->dev.init_name = |
1176 | kasprintf(GFP_KERNEL, "%s", | |
1177 | match->name); | |
a636ee7f | 1178 | |
a636ee7f PM |
1179 | if (!match->dev.init_name) |
1180 | return -ENOMEM; | |
1181 | } | |
bd05086b | 1182 | |
13977091 | 1183 | if (epdrv->pdrv->probe(match)) |
0258e182 FP |
1184 | pr_warn("%s: unable to probe %s early.\n", |
1185 | class_str, match->name); | |
13977091 MD |
1186 | else |
1187 | n++; | |
1188 | } | |
1189 | ||
1190 | if (n >= nr_probe) | |
1191 | break; | |
1192 | } | |
1193 | ||
1194 | if (left) | |
1195 | return n; | |
1196 | else | |
1197 | return -ENODEV; | |
1198 | } | |
1199 | ||
1200 | /** | |
4d26e139 | 1201 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1202 | * @class_str: string to identify early platform driver class |
1203 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1204 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1205 | * |
1206 | * Used by architecture code to probe registered early platform drivers | |
1207 | * within a certain class. For probe to happen a registered early platform | |
1208 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1209 | */ |
1210 | int __init early_platform_driver_probe(char *class_str, | |
1211 | int nr_probe, | |
1212 | int user_only) | |
1213 | { | |
1214 | int k, n, i; | |
1215 | ||
1216 | n = 0; | |
1217 | for (i = -2; n < nr_probe; i++) { | |
1218 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1219 | ||
1220 | if (k < 0) | |
1221 | break; | |
1222 | ||
1223 | n += k; | |
1224 | ||
1225 | if (user_only) | |
1226 | break; | |
1227 | } | |
1228 | ||
1229 | return n; | |
1230 | } | |
1231 | ||
1232 | /** | |
1233 | * early_platform_cleanup - clean up early platform code | |
1234 | */ | |
1235 | void __init early_platform_cleanup(void) | |
1236 | { | |
1237 | struct platform_device *pd, *pd2; | |
1238 | ||
1239 | /* clean up the devres list used to chain devices */ | |
1240 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1241 | dev.devres_head) { | |
1242 | list_del(&pd->dev.devres_head); | |
1243 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1244 | } | |
1245 | } | |
1246 |