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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * platform.c - platform 'pseudo' bus for legacy devices | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * Please see Documentation/driver-model/platform.txt for more | |
10 | * information. | |
11 | */ | |
12 | ||
daa41226 | 13 | #include <linux/string.h> |
d052d1be | 14 | #include <linux/platform_device.h> |
05212157 | 15 | #include <linux/of_device.h> |
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <linux/init.h> | |
18 | #include <linux/dma-mapping.h> | |
19 | #include <linux/bootmem.h> | |
20 | #include <linux/err.h> | |
4e57b681 | 21 | #include <linux/slab.h> |
9d730229 | 22 | #include <linux/pm_runtime.h> |
689ae231 | 23 | #include <linux/idr.h> |
91e56878 | 24 | #include <linux/acpi.h> |
1da177e4 | 25 | |
a1bdc7aa | 26 | #include "base.h" |
bed2b42d | 27 | #include "power/power.h" |
a1bdc7aa | 28 | |
689ae231 JD |
29 | /* For automatically allocated device IDs */ |
30 | static DEFINE_IDA(platform_devid_ida); | |
31 | ||
4a3ad20c GKH |
32 | #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \ |
33 | driver)) | |
00d3dcdd | 34 | |
1da177e4 | 35 | struct device platform_bus = { |
1e0b2cf9 | 36 | .init_name = "platform", |
1da177e4 | 37 | }; |
a96b2042 | 38 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 | 39 | |
a77ce816 KG |
40 | /** |
41 | * arch_setup_pdev_archdata - Allow manipulation of archdata before its used | |
7de636fa | 42 | * @pdev: platform device |
a77ce816 KG |
43 | * |
44 | * This is called before platform_device_add() such that any pdev_archdata may | |
45 | * be setup before the platform_notifier is called. So if a user needs to | |
46 | * manipulate any relevant information in the pdev_archdata they can do: | |
47 | * | |
b1d6d822 | 48 | * platform_device_alloc() |
a77ce816 KG |
49 | * ... manipulate ... |
50 | * platform_device_add() | |
51 | * | |
52 | * And if they don't care they can just call platform_device_register() and | |
53 | * everything will just work out. | |
54 | */ | |
55 | void __weak arch_setup_pdev_archdata(struct platform_device *pdev) | |
56 | { | |
57 | } | |
58 | ||
1da177e4 | 59 | /** |
4a3ad20c GKH |
60 | * platform_get_resource - get a resource for a device |
61 | * @dev: platform device | |
62 | * @type: resource type | |
63 | * @num: resource index | |
1da177e4 | 64 | */ |
4a3ad20c GKH |
65 | struct resource *platform_get_resource(struct platform_device *dev, |
66 | unsigned int type, unsigned int num) | |
1da177e4 LT |
67 | { |
68 | int i; | |
69 | ||
70 | for (i = 0; i < dev->num_resources; i++) { | |
71 | struct resource *r = &dev->resource[i]; | |
72 | ||
c9f66169 MD |
73 | if (type == resource_type(r) && num-- == 0) |
74 | return r; | |
1da177e4 LT |
75 | } |
76 | return NULL; | |
77 | } | |
a96b2042 | 78 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
79 | |
80 | /** | |
4a3ad20c GKH |
81 | * platform_get_irq - get an IRQ for a device |
82 | * @dev: platform device | |
83 | * @num: IRQ number index | |
1da177e4 LT |
84 | */ |
85 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
86 | { | |
5cf8f7db AL |
87 | #ifdef CONFIG_SPARC |
88 | /* sparc does not have irqs represented as IORESOURCE_IRQ resources */ | |
89 | if (!dev || num >= dev->archdata.num_irqs) | |
90 | return -ENXIO; | |
91 | return dev->archdata.irqs[num]; | |
92 | #else | |
1da177e4 LT |
93 | struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); |
94 | ||
305b3228 | 95 | return r ? r->start : -ENXIO; |
5cf8f7db | 96 | #endif |
1da177e4 | 97 | } |
a96b2042 | 98 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
99 | |
100 | /** | |
4a3ad20c GKH |
101 | * platform_get_resource_byname - get a resource for a device by name |
102 | * @dev: platform device | |
103 | * @type: resource type | |
104 | * @name: resource name | |
1da177e4 | 105 | */ |
4a3ad20c | 106 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
107 | unsigned int type, |
108 | const char *name) | |
1da177e4 LT |
109 | { |
110 | int i; | |
111 | ||
112 | for (i = 0; i < dev->num_resources; i++) { | |
113 | struct resource *r = &dev->resource[i]; | |
114 | ||
1b8cb929 PU |
115 | if (unlikely(!r->name)) |
116 | continue; | |
117 | ||
c9f66169 MD |
118 | if (type == resource_type(r) && !strcmp(r->name, name)) |
119 | return r; | |
1da177e4 LT |
120 | } |
121 | return NULL; | |
122 | } | |
a96b2042 | 123 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
124 | |
125 | /** | |
d6ff8551 | 126 | * platform_get_irq_byname - get an IRQ for a device by name |
4a3ad20c GKH |
127 | * @dev: platform device |
128 | * @name: IRQ name | |
1da177e4 | 129 | */ |
c0afe7ba | 130 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
1da177e4 | 131 | { |
4a3ad20c GKH |
132 | struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, |
133 | name); | |
1da177e4 | 134 | |
305b3228 | 135 | return r ? r->start : -ENXIO; |
1da177e4 | 136 | } |
a96b2042 | 137 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
138 | |
139 | /** | |
4a3ad20c GKH |
140 | * platform_add_devices - add a numbers of platform devices |
141 | * @devs: array of platform devices to add | |
142 | * @num: number of platform devices in array | |
1da177e4 LT |
143 | */ |
144 | int platform_add_devices(struct platform_device **devs, int num) | |
145 | { | |
146 | int i, ret = 0; | |
147 | ||
148 | for (i = 0; i < num; i++) { | |
149 | ret = platform_device_register(devs[i]); | |
150 | if (ret) { | |
151 | while (--i >= 0) | |
152 | platform_device_unregister(devs[i]); | |
153 | break; | |
154 | } | |
155 | } | |
156 | ||
157 | return ret; | |
158 | } | |
a96b2042 | 159 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 160 | |
37c12e74 RK |
161 | struct platform_object { |
162 | struct platform_device pdev; | |
163 | char name[1]; | |
164 | }; | |
165 | ||
1da177e4 | 166 | /** |
3c31f07a | 167 | * platform_device_put - destroy a platform device |
4a3ad20c | 168 | * @pdev: platform device to free |
37c12e74 | 169 | * |
4a3ad20c GKH |
170 | * Free all memory associated with a platform device. This function must |
171 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
172 | */ |
173 | void platform_device_put(struct platform_device *pdev) | |
174 | { | |
175 | if (pdev) | |
176 | put_device(&pdev->dev); | |
177 | } | |
178 | EXPORT_SYMBOL_GPL(platform_device_put); | |
179 | ||
180 | static void platform_device_release(struct device *dev) | |
181 | { | |
4a3ad20c GKH |
182 | struct platform_object *pa = container_of(dev, struct platform_object, |
183 | pdev.dev); | |
37c12e74 | 184 | |
7096d042 | 185 | of_device_node_put(&pa->pdev.dev); |
37c12e74 | 186 | kfree(pa->pdev.dev.platform_data); |
e710d7d5 | 187 | kfree(pa->pdev.mfd_cell); |
37c12e74 RK |
188 | kfree(pa->pdev.resource); |
189 | kfree(pa); | |
190 | } | |
191 | ||
192 | /** | |
3c31f07a | 193 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
194 | * @name: base name of the device we're adding |
195 | * @id: instance id | |
37c12e74 | 196 | * |
4a3ad20c GKH |
197 | * Create a platform device object which can have other objects attached |
198 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 199 | */ |
1359555e | 200 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
201 | { |
202 | struct platform_object *pa; | |
203 | ||
204 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); | |
205 | if (pa) { | |
206 | strcpy(pa->name, name); | |
207 | pa->pdev.name = pa->name; | |
208 | pa->pdev.id = id; | |
209 | device_initialize(&pa->pdev.dev); | |
210 | pa->pdev.dev.release = platform_device_release; | |
a77ce816 | 211 | arch_setup_pdev_archdata(&pa->pdev); |
37c12e74 RK |
212 | } |
213 | ||
93ce3061 | 214 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
215 | } |
216 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
217 | ||
218 | /** | |
3c31f07a | 219 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
220 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
221 | * @res: set of resources that needs to be allocated for the device | |
222 | * @num: number of resources | |
37c12e74 | 223 | * |
4a3ad20c GKH |
224 | * Add a copy of the resources to the platform device. The memory |
225 | * associated with the resources will be freed when the platform device is | |
226 | * released. | |
37c12e74 | 227 | */ |
4a3ad20c | 228 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 229 | const struct resource *res, unsigned int num) |
37c12e74 | 230 | { |
cea89623 | 231 | struct resource *r = NULL; |
37c12e74 | 232 | |
cea89623 UKK |
233 | if (res) { |
234 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); | |
235 | if (!r) | |
236 | return -ENOMEM; | |
37c12e74 | 237 | } |
cea89623 | 238 | |
4a03d6f7 | 239 | kfree(pdev->resource); |
cea89623 UKK |
240 | pdev->resource = r; |
241 | pdev->num_resources = num; | |
242 | return 0; | |
37c12e74 RK |
243 | } |
244 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
245 | ||
246 | /** | |
3c31f07a | 247 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
248 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
249 | * @data: platform specific data for this platform device | |
250 | * @size: size of platform specific data | |
37c12e74 | 251 | * |
4a3ad20c GKH |
252 | * Add a copy of platform specific data to the platform device's |
253 | * platform_data pointer. The memory associated with the platform data | |
254 | * will be freed when the platform device is released. | |
37c12e74 | 255 | */ |
4a3ad20c GKH |
256 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
257 | size_t size) | |
37c12e74 | 258 | { |
27a33f9e | 259 | void *d = NULL; |
5cfc64ce | 260 | |
27a33f9e UKK |
261 | if (data) { |
262 | d = kmemdup(data, size, GFP_KERNEL); | |
263 | if (!d) | |
264 | return -ENOMEM; | |
37c12e74 | 265 | } |
27a33f9e | 266 | |
251e031d | 267 | kfree(pdev->dev.platform_data); |
27a33f9e UKK |
268 | pdev->dev.platform_data = d; |
269 | return 0; | |
37c12e74 RK |
270 | } |
271 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
272 | ||
273 | /** | |
4a3ad20c GKH |
274 | * platform_device_add - add a platform device to device hierarchy |
275 | * @pdev: platform device we're adding | |
1da177e4 | 276 | * |
4a3ad20c GKH |
277 | * This is part 2 of platform_device_register(), though may be called |
278 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 279 | */ |
37c12e74 | 280 | int platform_device_add(struct platform_device *pdev) |
1da177e4 | 281 | { |
689ae231 | 282 | int i, ret; |
1da177e4 LT |
283 | |
284 | if (!pdev) | |
285 | return -EINVAL; | |
286 | ||
287 | if (!pdev->dev.parent) | |
288 | pdev->dev.parent = &platform_bus; | |
289 | ||
290 | pdev->dev.bus = &platform_bus_type; | |
291 | ||
689ae231 JD |
292 | switch (pdev->id) { |
293 | default: | |
1e0b2cf9 | 294 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
689ae231 JD |
295 | break; |
296 | case PLATFORM_DEVID_NONE: | |
acc0e90f | 297 | dev_set_name(&pdev->dev, "%s", pdev->name); |
689ae231 JD |
298 | break; |
299 | case PLATFORM_DEVID_AUTO: | |
300 | /* | |
301 | * Automatically allocated device ID. We mark it as such so | |
302 | * that we remember it must be freed, and we append a suffix | |
303 | * to avoid namespace collision with explicit IDs. | |
304 | */ | |
305 | ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL); | |
306 | if (ret < 0) | |
307 | goto err_out; | |
308 | pdev->id = ret; | |
309 | pdev->id_auto = true; | |
310 | dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); | |
311 | break; | |
312 | } | |
1da177e4 LT |
313 | |
314 | for (i = 0; i < pdev->num_resources; i++) { | |
315 | struct resource *p, *r = &pdev->resource[i]; | |
316 | ||
317 | if (r->name == NULL) | |
1e0b2cf9 | 318 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
319 | |
320 | p = r->parent; | |
321 | if (!p) { | |
c9f66169 | 322 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 323 | p = &iomem_resource; |
c9f66169 | 324 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
325 | p = &ioport_resource; |
326 | } | |
327 | ||
d960bb4d | 328 | if (p && insert_resource(p, r)) { |
1da177e4 LT |
329 | printk(KERN_ERR |
330 | "%s: failed to claim resource %d\n", | |
1e0b2cf9 | 331 | dev_name(&pdev->dev), i); |
1da177e4 LT |
332 | ret = -EBUSY; |
333 | goto failed; | |
334 | } | |
335 | } | |
336 | ||
337 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 338 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 339 | |
e3915532 | 340 | ret = device_add(&pdev->dev); |
1da177e4 LT |
341 | if (ret == 0) |
342 | return ret; | |
343 | ||
344 | failed: | |
689ae231 JD |
345 | if (pdev->id_auto) { |
346 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
347 | pdev->id = PLATFORM_DEVID_AUTO; | |
348 | } | |
349 | ||
c9f66169 MD |
350 | while (--i >= 0) { |
351 | struct resource *r = &pdev->resource[i]; | |
352 | unsigned long type = resource_type(r); | |
353 | ||
354 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
355 | release_resource(r); | |
356 | } | |
357 | ||
689ae231 | 358 | err_out: |
1da177e4 LT |
359 | return ret; |
360 | } | |
37c12e74 RK |
361 | EXPORT_SYMBOL_GPL(platform_device_add); |
362 | ||
363 | /** | |
4a3ad20c GKH |
364 | * platform_device_del - remove a platform-level device |
365 | * @pdev: platform device we're removing | |
1da177e4 | 366 | * |
4a3ad20c GKH |
367 | * Note that this function will also release all memory- and port-based |
368 | * resources owned by the device (@dev->resource). This function must | |
369 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 370 | */ |
93ce3061 | 371 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
372 | { |
373 | int i; | |
374 | ||
375 | if (pdev) { | |
dc4c15d4 JD |
376 | device_del(&pdev->dev); |
377 | ||
689ae231 JD |
378 | if (pdev->id_auto) { |
379 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
380 | pdev->id = PLATFORM_DEVID_AUTO; | |
381 | } | |
382 | ||
1da177e4 LT |
383 | for (i = 0; i < pdev->num_resources; i++) { |
384 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
385 | unsigned long type = resource_type(r); |
386 | ||
387 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
388 | release_resource(r); |
389 | } | |
1da177e4 LT |
390 | } |
391 | } | |
93ce3061 DT |
392 | EXPORT_SYMBOL_GPL(platform_device_del); |
393 | ||
394 | /** | |
4a3ad20c GKH |
395 | * platform_device_register - add a platform-level device |
396 | * @pdev: platform device we're adding | |
93ce3061 | 397 | */ |
4a3ad20c | 398 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
399 | { |
400 | device_initialize(&pdev->dev); | |
a77ce816 | 401 | arch_setup_pdev_archdata(pdev); |
93ce3061 DT |
402 | return platform_device_add(pdev); |
403 | } | |
a96b2042 | 404 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
405 | |
406 | /** | |
4a3ad20c GKH |
407 | * platform_device_unregister - unregister a platform-level device |
408 | * @pdev: platform device we're unregistering | |
93ce3061 | 409 | * |
4a3ad20c GKH |
410 | * Unregistration is done in 2 steps. First we release all resources |
411 | * and remove it from the subsystem, then we drop reference count by | |
412 | * calling platform_device_put(). | |
93ce3061 | 413 | */ |
4a3ad20c | 414 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
415 | { |
416 | platform_device_del(pdev); | |
417 | platform_device_put(pdev); | |
418 | } | |
a96b2042 | 419 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 420 | |
1da177e4 | 421 | /** |
01dcc60a | 422 | * platform_device_register_full - add a platform-level device with |
44f28bde | 423 | * resources and platform-specific data |
49a4ec18 | 424 | * |
01dcc60a | 425 | * @pdevinfo: data used to create device |
d8bf2540 | 426 | * |
f0eae0ed | 427 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 428 | */ |
01dcc60a | 429 | struct platform_device *platform_device_register_full( |
5a3072be | 430 | const struct platform_device_info *pdevinfo) |
d8bf2540 | 431 | { |
44f28bde | 432 | int ret = -ENOMEM; |
d8bf2540 | 433 | struct platform_device *pdev; |
d8bf2540 | 434 | |
01dcc60a | 435 | pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
44f28bde | 436 | if (!pdev) |
01dcc60a UKK |
437 | goto err_alloc; |
438 | ||
439 | pdev->dev.parent = pdevinfo->parent; | |
863f9f30 | 440 | ACPI_HANDLE_SET(&pdev->dev, pdevinfo->acpi_node.handle); |
01dcc60a UKK |
441 | |
442 | if (pdevinfo->dma_mask) { | |
443 | /* | |
444 | * This memory isn't freed when the device is put, | |
445 | * I don't have a nice idea for that though. Conceptually | |
446 | * dma_mask in struct device should not be a pointer. | |
447 | * See http://thread.gmane.org/gmane.linux.kernel.pci/9081 | |
448 | */ | |
449 | pdev->dev.dma_mask = | |
450 | kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); | |
451 | if (!pdev->dev.dma_mask) | |
452 | goto err; | |
453 | ||
454 | *pdev->dev.dma_mask = pdevinfo->dma_mask; | |
455 | pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; | |
456 | } | |
d8bf2540 | 457 | |
01dcc60a UKK |
458 | ret = platform_device_add_resources(pdev, |
459 | pdevinfo->res, pdevinfo->num_res); | |
807508c8 AV |
460 | if (ret) |
461 | goto err; | |
44f28bde | 462 | |
01dcc60a UKK |
463 | ret = platform_device_add_data(pdev, |
464 | pdevinfo->data, pdevinfo->size_data); | |
807508c8 AV |
465 | if (ret) |
466 | goto err; | |
d8bf2540 | 467 | |
44f28bde UKK |
468 | ret = platform_device_add(pdev); |
469 | if (ret) { | |
470 | err: | |
863f9f30 | 471 | ACPI_HANDLE_SET(&pdev->dev, NULL); |
01dcc60a UKK |
472 | kfree(pdev->dev.dma_mask); |
473 | ||
474 | err_alloc: | |
44f28bde UKK |
475 | platform_device_put(pdev); |
476 | return ERR_PTR(ret); | |
477 | } | |
d8bf2540 DES |
478 | |
479 | return pdev; | |
d8bf2540 | 480 | } |
01dcc60a | 481 | EXPORT_SYMBOL_GPL(platform_device_register_full); |
d8bf2540 | 482 | |
00d3dcdd RK |
483 | static int platform_drv_probe(struct device *_dev) |
484 | { | |
485 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
486 | struct platform_device *dev = to_platform_device(_dev); | |
94d76d5d | 487 | int ret; |
00d3dcdd | 488 | |
94d76d5d RW |
489 | if (ACPI_HANDLE(_dev)) |
490 | acpi_dev_pm_attach(_dev, true); | |
491 | ||
492 | ret = drv->probe(dev); | |
493 | if (ret && ACPI_HANDLE(_dev)) | |
494 | acpi_dev_pm_detach(_dev, true); | |
495 | ||
496 | return ret; | |
00d3dcdd RK |
497 | } |
498 | ||
c67334fb DB |
499 | static int platform_drv_probe_fail(struct device *_dev) |
500 | { | |
501 | return -ENXIO; | |
502 | } | |
503 | ||
00d3dcdd RK |
504 | static int platform_drv_remove(struct device *_dev) |
505 | { | |
506 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
507 | struct platform_device *dev = to_platform_device(_dev); | |
94d76d5d | 508 | int ret; |
00d3dcdd | 509 | |
94d76d5d RW |
510 | ret = drv->remove(dev); |
511 | if (ACPI_HANDLE(_dev)) | |
512 | acpi_dev_pm_detach(_dev, true); | |
513 | ||
514 | return ret; | |
00d3dcdd RK |
515 | } |
516 | ||
517 | static void platform_drv_shutdown(struct device *_dev) | |
518 | { | |
519 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
520 | struct platform_device *dev = to_platform_device(_dev); | |
521 | ||
522 | drv->shutdown(dev); | |
94d76d5d RW |
523 | if (ACPI_HANDLE(_dev)) |
524 | acpi_dev_pm_detach(_dev, true); | |
00d3dcdd RK |
525 | } |
526 | ||
00d3dcdd | 527 | /** |
3c31f07a | 528 | * platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 529 | * @drv: platform driver structure |
00d3dcdd RK |
530 | */ |
531 | int platform_driver_register(struct platform_driver *drv) | |
532 | { | |
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 | } | |
543 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
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 | |
558 | * @probe: the driver probe routine, probably from an __init section | |
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 | * | |
569 | * Returns zero if the driver registered and bound to a device, else returns | |
570 | * a negative error code and with the driver not registered. | |
571 | */ | |
c63e0783 | 572 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
573 | int (*probe)(struct platform_device *)) |
574 | { | |
575 | int retval, code; | |
576 | ||
1a6f2a75 DT |
577 | /* make sure driver won't have bind/unbind attributes */ |
578 | drv->driver.suppress_bind_attrs = true; | |
579 | ||
c67334fb DB |
580 | /* temporary section violation during probe() */ |
581 | drv->probe = probe; | |
582 | retval = code = platform_driver_register(drv); | |
583 | ||
1a6f2a75 DT |
584 | /* |
585 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
586 | * the list of drivers in order to probe new devices. Check to see |
587 | * if the probe was successful, and make sure any forced probes of | |
588 | * new devices fail. | |
589 | */ | |
d79d3244 | 590 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb | 591 | drv->probe = NULL; |
e5dd1278 | 592 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
593 | retval = -ENODEV; |
594 | drv->driver.probe = platform_drv_probe_fail; | |
d79d3244 | 595 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
596 | |
597 | if (code != retval) | |
598 | platform_driver_unregister(drv); | |
599 | return retval; | |
600 | } | |
601 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 602 | |
ecdf6ceb DT |
603 | /** |
604 | * platform_create_bundle - register driver and create corresponding device | |
605 | * @driver: platform driver structure | |
606 | * @probe: the driver probe routine, probably from an __init section | |
607 | * @res: set of resources that needs to be allocated for the device | |
608 | * @n_res: number of resources | |
609 | * @data: platform specific data for this platform device | |
610 | * @size: size of platform specific data | |
611 | * | |
612 | * Use this in legacy-style modules that probe hardware directly and | |
613 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
614 | * |
615 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb DT |
616 | */ |
617 | struct platform_device * __init_or_module platform_create_bundle( | |
618 | struct platform_driver *driver, | |
619 | int (*probe)(struct platform_device *), | |
620 | struct resource *res, unsigned int n_res, | |
621 | const void *data, size_t size) | |
622 | { | |
623 | struct platform_device *pdev; | |
624 | int error; | |
625 | ||
626 | pdev = platform_device_alloc(driver->driver.name, -1); | |
627 | if (!pdev) { | |
628 | error = -ENOMEM; | |
629 | goto err_out; | |
630 | } | |
631 | ||
807508c8 AV |
632 | error = platform_device_add_resources(pdev, res, n_res); |
633 | if (error) | |
634 | goto err_pdev_put; | |
ecdf6ceb | 635 | |
807508c8 AV |
636 | error = platform_device_add_data(pdev, data, size); |
637 | if (error) | |
638 | goto err_pdev_put; | |
ecdf6ceb DT |
639 | |
640 | error = platform_device_add(pdev); | |
641 | if (error) | |
642 | goto err_pdev_put; | |
643 | ||
644 | error = platform_driver_probe(driver, probe); | |
645 | if (error) | |
646 | goto err_pdev_del; | |
647 | ||
648 | return pdev; | |
649 | ||
650 | err_pdev_del: | |
651 | platform_device_del(pdev); | |
652 | err_pdev_put: | |
653 | platform_device_put(pdev); | |
654 | err_out: | |
655 | return ERR_PTR(error); | |
656 | } | |
657 | EXPORT_SYMBOL_GPL(platform_create_bundle); | |
658 | ||
a0245f7a DB |
659 | /* modalias support enables more hands-off userspace setup: |
660 | * (a) environment variable lets new-style hotplug events work once system is | |
661 | * fully running: "modprobe $MODALIAS" | |
662 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
663 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
664 | */ | |
4a3ad20c GKH |
665 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
666 | char *buf) | |
a0245f7a DB |
667 | { |
668 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 669 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
670 | |
671 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
672 | } | |
673 | ||
674 | static struct device_attribute platform_dev_attrs[] = { | |
675 | __ATTR_RO(modalias), | |
676 | __ATTR_NULL, | |
677 | }; | |
678 | ||
7eff2e7a | 679 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
680 | { |
681 | struct platform_device *pdev = to_platform_device(dev); | |
eca39301 GL |
682 | int rc; |
683 | ||
684 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
07d57a32 | 685 | rc = of_device_uevent_modalias(dev,env); |
eca39301 GL |
686 | if (rc != -ENODEV) |
687 | return rc; | |
a0245f7a | 688 | |
57fee4a5 | 689 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
0a26813c | 690 | pdev->name); |
a0245f7a DB |
691 | return 0; |
692 | } | |
693 | ||
57fee4a5 | 694 | static const struct platform_device_id *platform_match_id( |
831fad2f | 695 | const struct platform_device_id *id, |
57fee4a5 EM |
696 | struct platform_device *pdev) |
697 | { | |
698 | while (id->name[0]) { | |
699 | if (strcmp(pdev->name, id->name) == 0) { | |
700 | pdev->id_entry = id; | |
701 | return id; | |
702 | } | |
703 | id++; | |
704 | } | |
705 | return NULL; | |
706 | } | |
707 | ||
1da177e4 | 708 | /** |
4a3ad20c GKH |
709 | * platform_match - bind platform device to platform driver. |
710 | * @dev: device. | |
711 | * @drv: driver. | |
1da177e4 | 712 | * |
4a3ad20c GKH |
713 | * Platform device IDs are assumed to be encoded like this: |
714 | * "<name><instance>", where <name> is a short description of the type of | |
715 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
716 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
717 | * "<name>". So, extract the <name> from the platform_device structure, | |
718 | * and compare it against the name of the driver. Return whether they match | |
719 | * or not. | |
1da177e4 | 720 | */ |
4a3ad20c | 721 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 722 | { |
71b3e0c1 | 723 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
724 | struct platform_driver *pdrv = to_platform_driver(drv); |
725 | ||
05212157 GL |
726 | /* Attempt an OF style match first */ |
727 | if (of_driver_match_device(dev, drv)) | |
728 | return 1; | |
729 | ||
91e56878 MW |
730 | /* Then try ACPI style match */ |
731 | if (acpi_driver_match_device(dev, drv)) | |
732 | return 1; | |
733 | ||
05212157 | 734 | /* Then try to match against the id table */ |
57fee4a5 EM |
735 | if (pdrv->id_table) |
736 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 737 | |
57fee4a5 | 738 | /* fall-back to driver name match */ |
1e0b2cf9 | 739 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
740 | } |
741 | ||
25e18499 RW |
742 | #ifdef CONFIG_PM_SLEEP |
743 | ||
744 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 745 | { |
783ea7d4 MD |
746 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
747 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
748 | int ret = 0; |
749 | ||
783ea7d4 MD |
750 | if (dev->driver && pdrv->suspend) |
751 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
752 | |
753 | return ret; | |
754 | } | |
755 | ||
25e18499 | 756 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 757 | { |
783ea7d4 MD |
758 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
759 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
760 | int ret = 0; |
761 | ||
783ea7d4 MD |
762 | if (dev->driver && pdrv->resume) |
763 | ret = pdrv->resume(pdev); | |
9480e307 | 764 | |
1da177e4 LT |
765 | return ret; |
766 | } | |
767 | ||
69c9dd1e | 768 | #endif /* CONFIG_PM_SLEEP */ |
9d730229 | 769 | |
25e18499 RW |
770 | #ifdef CONFIG_SUSPEND |
771 | ||
69c9dd1e | 772 | int platform_pm_suspend(struct device *dev) |
25e18499 RW |
773 | { |
774 | struct device_driver *drv = dev->driver; | |
775 | int ret = 0; | |
776 | ||
adf09493 RW |
777 | if (!drv) |
778 | return 0; | |
779 | ||
780 | if (drv->pm) { | |
25e18499 RW |
781 | if (drv->pm->suspend) |
782 | ret = drv->pm->suspend(dev); | |
783 | } else { | |
784 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
785 | } | |
786 | ||
787 | return ret; | |
788 | } | |
789 | ||
69c9dd1e | 790 | int platform_pm_resume(struct device *dev) |
25e18499 RW |
791 | { |
792 | struct device_driver *drv = dev->driver; | |
793 | int ret = 0; | |
794 | ||
adf09493 RW |
795 | if (!drv) |
796 | return 0; | |
797 | ||
798 | if (drv->pm) { | |
25e18499 RW |
799 | if (drv->pm->resume) |
800 | ret = drv->pm->resume(dev); | |
801 | } else { | |
802 | ret = platform_legacy_resume(dev); | |
803 | } | |
804 | ||
805 | return ret; | |
806 | } | |
807 | ||
69c9dd1e | 808 | #endif /* CONFIG_SUSPEND */ |
25e18499 | 809 | |
1f112cee | 810 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 | 811 | |
69c9dd1e | 812 | int platform_pm_freeze(struct device *dev) |
25e18499 RW |
813 | { |
814 | struct device_driver *drv = dev->driver; | |
815 | int ret = 0; | |
816 | ||
817 | if (!drv) | |
818 | return 0; | |
819 | ||
820 | if (drv->pm) { | |
821 | if (drv->pm->freeze) | |
822 | ret = drv->pm->freeze(dev); | |
823 | } else { | |
824 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
825 | } | |
826 | ||
827 | return ret; | |
828 | } | |
829 | ||
69c9dd1e | 830 | int platform_pm_thaw(struct device *dev) |
25e18499 RW |
831 | { |
832 | struct device_driver *drv = dev->driver; | |
833 | int ret = 0; | |
834 | ||
adf09493 RW |
835 | if (!drv) |
836 | return 0; | |
837 | ||
838 | if (drv->pm) { | |
25e18499 RW |
839 | if (drv->pm->thaw) |
840 | ret = drv->pm->thaw(dev); | |
841 | } else { | |
842 | ret = platform_legacy_resume(dev); | |
843 | } | |
844 | ||
845 | return ret; | |
846 | } | |
847 | ||
69c9dd1e | 848 | int platform_pm_poweroff(struct device *dev) |
25e18499 RW |
849 | { |
850 | struct device_driver *drv = dev->driver; | |
851 | int ret = 0; | |
852 | ||
adf09493 RW |
853 | if (!drv) |
854 | return 0; | |
855 | ||
856 | if (drv->pm) { | |
25e18499 RW |
857 | if (drv->pm->poweroff) |
858 | ret = drv->pm->poweroff(dev); | |
859 | } else { | |
860 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
861 | } | |
862 | ||
863 | return ret; | |
864 | } | |
865 | ||
69c9dd1e | 866 | int platform_pm_restore(struct device *dev) |
25e18499 RW |
867 | { |
868 | struct device_driver *drv = dev->driver; | |
869 | int ret = 0; | |
870 | ||
adf09493 RW |
871 | if (!drv) |
872 | return 0; | |
873 | ||
874 | if (drv->pm) { | |
25e18499 RW |
875 | if (drv->pm->restore) |
876 | ret = drv->pm->restore(dev); | |
877 | } else { | |
878 | ret = platform_legacy_resume(dev); | |
879 | } | |
880 | ||
881 | return ret; | |
882 | } | |
883 | ||
69c9dd1e | 884 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 885 | |
d9ab7716 | 886 | static const struct dev_pm_ops platform_dev_pm_ops = { |
8b313a38 RW |
887 | .runtime_suspend = pm_generic_runtime_suspend, |
888 | .runtime_resume = pm_generic_runtime_resume, | |
889 | .runtime_idle = pm_generic_runtime_idle, | |
69c9dd1e | 890 | USE_PLATFORM_PM_SLEEP_OPS |
25e18499 RW |
891 | }; |
892 | ||
1da177e4 LT |
893 | struct bus_type platform_bus_type = { |
894 | .name = "platform", | |
a0245f7a | 895 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 896 | .match = platform_match, |
a0245f7a | 897 | .uevent = platform_uevent, |
9d730229 | 898 | .pm = &platform_dev_pm_ops, |
1da177e4 | 899 | }; |
a96b2042 | 900 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
901 | |
902 | int __init platform_bus_init(void) | |
903 | { | |
fbfb1445 CH |
904 | int error; |
905 | ||
13977091 MD |
906 | early_platform_cleanup(); |
907 | ||
fbfb1445 CH |
908 | error = device_register(&platform_bus); |
909 | if (error) | |
910 | return error; | |
911 | error = bus_register(&platform_bus_type); | |
912 | if (error) | |
913 | device_unregister(&platform_bus); | |
914 | return error; | |
1da177e4 LT |
915 | } |
916 | ||
917 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
918 | u64 dma_get_required_mask(struct device *dev) | |
919 | { | |
920 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
921 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
922 | u64 mask; | |
923 | ||
924 | if (!high_totalram) { | |
925 | /* convert to mask just covering totalram */ | |
926 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
927 | low_totalram += low_totalram - 1; | |
928 | mask = low_totalram; | |
929 | } else { | |
930 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
931 | high_totalram += high_totalram - 1; | |
932 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
933 | } | |
e88a0c2c | 934 | return mask; |
1da177e4 LT |
935 | } |
936 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
937 | #endif | |
13977091 MD |
938 | |
939 | static __initdata LIST_HEAD(early_platform_driver_list); | |
940 | static __initdata LIST_HEAD(early_platform_device_list); | |
941 | ||
942 | /** | |
4d26e139 | 943 | * early_platform_driver_register - register early platform driver |
d86c1302 | 944 | * @epdrv: early_platform driver structure |
13977091 | 945 | * @buf: string passed from early_param() |
4d26e139 MD |
946 | * |
947 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
948 | */ |
949 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
950 | char *buf) | |
951 | { | |
c60e0504 | 952 | char *tmp; |
13977091 MD |
953 | int n; |
954 | ||
955 | /* Simply add the driver to the end of the global list. | |
956 | * Drivers will by default be put on the list in compiled-in order. | |
957 | */ | |
958 | if (!epdrv->list.next) { | |
959 | INIT_LIST_HEAD(&epdrv->list); | |
960 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
961 | } | |
962 | ||
963 | /* If the user has specified device then make sure the driver | |
964 | * gets prioritized. The driver of the last device specified on | |
965 | * command line will be put first on the list. | |
966 | */ | |
967 | n = strlen(epdrv->pdrv->driver.name); | |
968 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
969 | list_move(&epdrv->list, &early_platform_driver_list); | |
970 | ||
c60e0504 MD |
971 | /* Allow passing parameters after device name */ |
972 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 973 | epdrv->requested_id = -1; |
c60e0504 MD |
974 | else { |
975 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
976 | &tmp, 10); | |
977 | ||
978 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
979 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
980 | n = 0; | |
981 | } else | |
982 | n += strcspn(&buf[n + 1], ",") + 1; | |
983 | } | |
984 | ||
985 | if (buf[n] == ',') | |
986 | n++; | |
987 | ||
988 | if (epdrv->bufsize) { | |
989 | memcpy(epdrv->buffer, &buf[n], | |
990 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
991 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
992 | } | |
13977091 MD |
993 | } |
994 | ||
995 | return 0; | |
996 | } | |
997 | ||
998 | /** | |
4d26e139 | 999 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
1000 | * @devs: array of early platform devices to add |
1001 | * @num: number of early platform devices in array | |
4d26e139 MD |
1002 | * |
1003 | * Used by early architecture code to register early platform devices and | |
1004 | * their platform data. | |
13977091 MD |
1005 | */ |
1006 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1007 | { | |
1008 | struct device *dev; | |
1009 | int i; | |
1010 | ||
1011 | /* simply add the devices to list */ | |
1012 | for (i = 0; i < num; i++) { | |
1013 | dev = &devs[i]->dev; | |
1014 | ||
1015 | if (!dev->devres_head.next) { | |
bed2b42d | 1016 | pm_runtime_early_init(dev); |
13977091 MD |
1017 | INIT_LIST_HEAD(&dev->devres_head); |
1018 | list_add_tail(&dev->devres_head, | |
1019 | &early_platform_device_list); | |
1020 | } | |
1021 | } | |
1022 | } | |
1023 | ||
1024 | /** | |
4d26e139 | 1025 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 1026 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
1027 | * |
1028 | * Used by architecture code to register all early platform drivers | |
1029 | * for a certain class. If omitted then only early platform drivers | |
1030 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
1031 | */ |
1032 | void __init early_platform_driver_register_all(char *class_str) | |
1033 | { | |
1034 | /* The "class_str" parameter may or may not be present on the kernel | |
1035 | * command line. If it is present then there may be more than one | |
1036 | * matching parameter. | |
1037 | * | |
1038 | * Since we register our early platform drivers using early_param() | |
1039 | * we need to make sure that they also get registered in the case | |
1040 | * when the parameter is missing from the kernel command line. | |
1041 | * | |
1042 | * We use parse_early_options() to make sure the early_param() gets | |
1043 | * called at least once. The early_param() may be called more than | |
1044 | * once since the name of the preferred device may be specified on | |
1045 | * the kernel command line. early_platform_driver_register() handles | |
1046 | * this case for us. | |
1047 | */ | |
1048 | parse_early_options(class_str); | |
1049 | } | |
1050 | ||
1051 | /** | |
4d26e139 | 1052 | * early_platform_match - find early platform device matching driver |
d86c1302 | 1053 | * @epdrv: early platform driver structure |
13977091 MD |
1054 | * @id: id to match against |
1055 | */ | |
1056 | static __init struct platform_device * | |
1057 | early_platform_match(struct early_platform_driver *epdrv, int id) | |
1058 | { | |
1059 | struct platform_device *pd; | |
1060 | ||
1061 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1062 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1063 | if (pd->id == id) | |
1064 | return pd; | |
1065 | ||
1066 | return NULL; | |
1067 | } | |
1068 | ||
1069 | /** | |
4d26e139 | 1070 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1071 | * @epdrv: early platform driver structure |
13977091 MD |
1072 | * @id: return true if id or above exists |
1073 | */ | |
1074 | static __init int early_platform_left(struct early_platform_driver *epdrv, | |
1075 | int id) | |
1076 | { | |
1077 | struct platform_device *pd; | |
1078 | ||
1079 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1080 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1081 | if (pd->id >= id) | |
1082 | return 1; | |
1083 | ||
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | /** | |
4d26e139 | 1088 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1089 | * @class_str: string to identify early platform driver class |
1090 | * @id: id to match against | |
1091 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1092 | */ | |
1093 | static int __init early_platform_driver_probe_id(char *class_str, | |
1094 | int id, | |
1095 | int nr_probe) | |
1096 | { | |
1097 | struct early_platform_driver *epdrv; | |
1098 | struct platform_device *match; | |
1099 | int match_id; | |
1100 | int n = 0; | |
1101 | int left = 0; | |
1102 | ||
1103 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1104 | /* only use drivers matching our class_str */ | |
1105 | if (strcmp(class_str, epdrv->class_str)) | |
1106 | continue; | |
1107 | ||
1108 | if (id == -2) { | |
1109 | match_id = epdrv->requested_id; | |
1110 | left = 1; | |
1111 | ||
1112 | } else { | |
1113 | match_id = id; | |
1114 | left += early_platform_left(epdrv, id); | |
1115 | ||
1116 | /* skip requested id */ | |
1117 | switch (epdrv->requested_id) { | |
1118 | case EARLY_PLATFORM_ID_ERROR: | |
1119 | case EARLY_PLATFORM_ID_UNSET: | |
1120 | break; | |
1121 | default: | |
1122 | if (epdrv->requested_id == id) | |
1123 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1124 | } | |
1125 | } | |
1126 | ||
1127 | switch (match_id) { | |
1128 | case EARLY_PLATFORM_ID_ERROR: | |
1129 | pr_warning("%s: unable to parse %s parameter\n", | |
1130 | class_str, epdrv->pdrv->driver.name); | |
1131 | /* fall-through */ | |
1132 | case EARLY_PLATFORM_ID_UNSET: | |
1133 | match = NULL; | |
1134 | break; | |
1135 | default: | |
1136 | match = early_platform_match(epdrv, match_id); | |
1137 | } | |
1138 | ||
1139 | if (match) { | |
a636ee7f PM |
1140 | /* |
1141 | * Set up a sensible init_name to enable | |
1142 | * dev_name() and others to be used before the | |
1143 | * rest of the driver core is initialized. | |
1144 | */ | |
06fe53be | 1145 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1146 | if (match->id != -1) |
bd05086b PM |
1147 | match->dev.init_name = |
1148 | kasprintf(GFP_KERNEL, "%s.%d", | |
1149 | match->name, | |
1150 | match->id); | |
a636ee7f | 1151 | else |
bd05086b PM |
1152 | match->dev.init_name = |
1153 | kasprintf(GFP_KERNEL, "%s", | |
1154 | match->name); | |
a636ee7f | 1155 | |
a636ee7f PM |
1156 | if (!match->dev.init_name) |
1157 | return -ENOMEM; | |
1158 | } | |
bd05086b | 1159 | |
13977091 MD |
1160 | if (epdrv->pdrv->probe(match)) |
1161 | pr_warning("%s: unable to probe %s early.\n", | |
1162 | class_str, match->name); | |
1163 | else | |
1164 | n++; | |
1165 | } | |
1166 | ||
1167 | if (n >= nr_probe) | |
1168 | break; | |
1169 | } | |
1170 | ||
1171 | if (left) | |
1172 | return n; | |
1173 | else | |
1174 | return -ENODEV; | |
1175 | } | |
1176 | ||
1177 | /** | |
4d26e139 | 1178 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1179 | * @class_str: string to identify early platform driver class |
1180 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1181 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1182 | * |
1183 | * Used by architecture code to probe registered early platform drivers | |
1184 | * within a certain class. For probe to happen a registered early platform | |
1185 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1186 | */ |
1187 | int __init early_platform_driver_probe(char *class_str, | |
1188 | int nr_probe, | |
1189 | int user_only) | |
1190 | { | |
1191 | int k, n, i; | |
1192 | ||
1193 | n = 0; | |
1194 | for (i = -2; n < nr_probe; i++) { | |
1195 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1196 | ||
1197 | if (k < 0) | |
1198 | break; | |
1199 | ||
1200 | n += k; | |
1201 | ||
1202 | if (user_only) | |
1203 | break; | |
1204 | } | |
1205 | ||
1206 | return n; | |
1207 | } | |
1208 | ||
1209 | /** | |
1210 | * early_platform_cleanup - clean up early platform code | |
1211 | */ | |
1212 | void __init early_platform_cleanup(void) | |
1213 | { | |
1214 | struct platform_device *pd, *pd2; | |
1215 | ||
1216 | /* clean up the devres list used to chain devices */ | |
1217 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1218 | dev.devres_head) { | |
1219 | list_del(&pd->dev.devres_head); | |
1220 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1221 | } | |
1222 | } | |
1223 |