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> |
9ec36caf | 16 | #include <linux/of_irq.h> |
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/init.h> | |
19 | #include <linux/dma-mapping.h> | |
20 | #include <linux/bootmem.h> | |
21 | #include <linux/err.h> | |
4e57b681 | 22 | #include <linux/slab.h> |
9d730229 | 23 | #include <linux/pm_runtime.h> |
f48c767c | 24 | #include <linux/pm_domain.h> |
689ae231 | 25 | #include <linux/idr.h> |
91e56878 | 26 | #include <linux/acpi.h> |
86be408b | 27 | #include <linux/clk/clk-conf.h> |
3d713e0e | 28 | #include <linux/limits.h> |
1da177e4 | 29 | |
a1bdc7aa | 30 | #include "base.h" |
bed2b42d | 31 | #include "power/power.h" |
a1bdc7aa | 32 | |
689ae231 JD |
33 | /* For automatically allocated device IDs */ |
34 | static DEFINE_IDA(platform_devid_ida); | |
35 | ||
1da177e4 | 36 | struct device platform_bus = { |
1e0b2cf9 | 37 | .init_name = "platform", |
1da177e4 | 38 | }; |
a96b2042 | 39 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 | 40 | |
a77ce816 KG |
41 | /** |
42 | * arch_setup_pdev_archdata - Allow manipulation of archdata before its used | |
7de636fa | 43 | * @pdev: platform device |
a77ce816 KG |
44 | * |
45 | * This is called before platform_device_add() such that any pdev_archdata may | |
46 | * be setup before the platform_notifier is called. So if a user needs to | |
47 | * manipulate any relevant information in the pdev_archdata they can do: | |
48 | * | |
b1d6d822 | 49 | * platform_device_alloc() |
0258e182 FP |
50 | * ... manipulate ... |
51 | * platform_device_add() | |
a77ce816 KG |
52 | * |
53 | * And if they don't care they can just call platform_device_register() and | |
54 | * everything will just work out. | |
55 | */ | |
56 | void __weak arch_setup_pdev_archdata(struct platform_device *pdev) | |
57 | { | |
58 | } | |
59 | ||
1da177e4 | 60 | /** |
4a3ad20c GKH |
61 | * platform_get_resource - get a resource for a device |
62 | * @dev: platform device | |
63 | * @type: resource type | |
64 | * @num: resource index | |
1da177e4 | 65 | */ |
4a3ad20c GKH |
66 | struct resource *platform_get_resource(struct platform_device *dev, |
67 | unsigned int type, unsigned int num) | |
1da177e4 LT |
68 | { |
69 | int i; | |
70 | ||
71 | for (i = 0; i < dev->num_resources; i++) { | |
72 | struct resource *r = &dev->resource[i]; | |
73 | ||
c9f66169 MD |
74 | if (type == resource_type(r) && num-- == 0) |
75 | return r; | |
1da177e4 LT |
76 | } |
77 | return NULL; | |
78 | } | |
a96b2042 | 79 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
80 | |
81 | /** | |
4a3ad20c GKH |
82 | * platform_get_irq - get an IRQ for a device |
83 | * @dev: platform device | |
84 | * @num: IRQ number index | |
1da177e4 LT |
85 | */ |
86 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
87 | { | |
5cf8f7db AL |
88 | #ifdef CONFIG_SPARC |
89 | /* sparc does not have irqs represented as IORESOURCE_IRQ resources */ | |
90 | if (!dev || num >= dev->archdata.num_irqs) | |
91 | return -ENXIO; | |
92 | return dev->archdata.irqs[num]; | |
93 | #else | |
9ec36caf | 94 | struct resource *r; |
aff008ad GR |
95 | if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) { |
96 | int ret; | |
97 | ||
98 | ret = of_irq_get(dev->dev.of_node, num); | |
99 | if (ret >= 0 || ret == -EPROBE_DEFER) | |
100 | return ret; | |
101 | } | |
9ec36caf RH |
102 | |
103 | r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
7085a740 LW |
104 | /* |
105 | * The resources may pass trigger flags to the irqs that need | |
106 | * to be set up. It so happens that the trigger flags for | |
107 | * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER* | |
108 | * settings. | |
109 | */ | |
110 | if (r && r->flags & IORESOURCE_BITS) | |
111 | irqd_set_trigger_type(irq_get_irq_data(r->start), | |
112 | r->flags & IORESOURCE_BITS); | |
1da177e4 | 113 | |
305b3228 | 114 | return r ? r->start : -ENXIO; |
5cf8f7db | 115 | #endif |
1da177e4 | 116 | } |
a96b2042 | 117 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
118 | |
119 | /** | |
4a3ad20c GKH |
120 | * platform_get_resource_byname - get a resource for a device by name |
121 | * @dev: platform device | |
122 | * @type: resource type | |
123 | * @name: resource name | |
1da177e4 | 124 | */ |
4a3ad20c | 125 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
126 | unsigned int type, |
127 | const char *name) | |
1da177e4 LT |
128 | { |
129 | int i; | |
130 | ||
131 | for (i = 0; i < dev->num_resources; i++) { | |
132 | struct resource *r = &dev->resource[i]; | |
133 | ||
1b8cb929 PU |
134 | if (unlikely(!r->name)) |
135 | continue; | |
136 | ||
c9f66169 MD |
137 | if (type == resource_type(r) && !strcmp(r->name, name)) |
138 | return r; | |
1da177e4 LT |
139 | } |
140 | return NULL; | |
141 | } | |
a96b2042 | 142 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
143 | |
144 | /** | |
d6ff8551 | 145 | * platform_get_irq_byname - get an IRQ for a device by name |
4a3ad20c GKH |
146 | * @dev: platform device |
147 | * @name: IRQ name | |
1da177e4 | 148 | */ |
c0afe7ba | 149 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
1da177e4 | 150 | { |
ad69674e GS |
151 | struct resource *r; |
152 | ||
aff008ad GR |
153 | if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) { |
154 | int ret; | |
155 | ||
156 | ret = of_irq_get_byname(dev->dev.of_node, name); | |
157 | if (ret >= 0 || ret == -EPROBE_DEFER) | |
158 | return ret; | |
159 | } | |
1da177e4 | 160 | |
ad69674e | 161 | r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name); |
305b3228 | 162 | return r ? r->start : -ENXIO; |
1da177e4 | 163 | } |
a96b2042 | 164 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
165 | |
166 | /** | |
4a3ad20c GKH |
167 | * platform_add_devices - add a numbers of platform devices |
168 | * @devs: array of platform devices to add | |
169 | * @num: number of platform devices in array | |
1da177e4 LT |
170 | */ |
171 | int platform_add_devices(struct platform_device **devs, int num) | |
172 | { | |
173 | int i, ret = 0; | |
174 | ||
175 | for (i = 0; i < num; i++) { | |
176 | ret = platform_device_register(devs[i]); | |
177 | if (ret) { | |
178 | while (--i >= 0) | |
179 | platform_device_unregister(devs[i]); | |
180 | break; | |
181 | } | |
182 | } | |
183 | ||
184 | return ret; | |
185 | } | |
a96b2042 | 186 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 187 | |
37c12e74 RK |
188 | struct platform_object { |
189 | struct platform_device pdev; | |
1cec24c5 | 190 | char name[]; |
37c12e74 RK |
191 | }; |
192 | ||
1da177e4 | 193 | /** |
3c31f07a | 194 | * platform_device_put - destroy a platform device |
4a3ad20c | 195 | * @pdev: platform device to free |
37c12e74 | 196 | * |
4a3ad20c GKH |
197 | * Free all memory associated with a platform device. This function must |
198 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
199 | */ |
200 | void platform_device_put(struct platform_device *pdev) | |
201 | { | |
202 | if (pdev) | |
203 | put_device(&pdev->dev); | |
204 | } | |
205 | EXPORT_SYMBOL_GPL(platform_device_put); | |
206 | ||
207 | static void platform_device_release(struct device *dev) | |
208 | { | |
4a3ad20c GKH |
209 | struct platform_object *pa = container_of(dev, struct platform_object, |
210 | pdev.dev); | |
37c12e74 | 211 | |
7096d042 | 212 | of_device_node_put(&pa->pdev.dev); |
37c12e74 | 213 | kfree(pa->pdev.dev.platform_data); |
e710d7d5 | 214 | kfree(pa->pdev.mfd_cell); |
37c12e74 | 215 | kfree(pa->pdev.resource); |
3d713e0e | 216 | kfree(pa->pdev.driver_override); |
37c12e74 RK |
217 | kfree(pa); |
218 | } | |
219 | ||
220 | /** | |
3c31f07a | 221 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
222 | * @name: base name of the device we're adding |
223 | * @id: instance id | |
37c12e74 | 224 | * |
4a3ad20c GKH |
225 | * Create a platform device object which can have other objects attached |
226 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 227 | */ |
1359555e | 228 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
229 | { |
230 | struct platform_object *pa; | |
231 | ||
1cec24c5 | 232 | pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL); |
37c12e74 RK |
233 | if (pa) { |
234 | strcpy(pa->name, name); | |
235 | pa->pdev.name = pa->name; | |
236 | pa->pdev.id = id; | |
237 | device_initialize(&pa->pdev.dev); | |
238 | pa->pdev.dev.release = platform_device_release; | |
a77ce816 | 239 | arch_setup_pdev_archdata(&pa->pdev); |
37c12e74 RK |
240 | } |
241 | ||
93ce3061 | 242 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
243 | } |
244 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
245 | ||
246 | /** | |
3c31f07a | 247 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
248 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
249 | * @res: set of resources that needs to be allocated for the device | |
250 | * @num: number of resources | |
37c12e74 | 251 | * |
4a3ad20c GKH |
252 | * Add a copy of the resources to the platform device. The memory |
253 | * associated with the resources will be freed when the platform device is | |
254 | * released. | |
37c12e74 | 255 | */ |
4a3ad20c | 256 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 257 | const struct resource *res, unsigned int num) |
37c12e74 | 258 | { |
cea89623 | 259 | struct resource *r = NULL; |
37c12e74 | 260 | |
cea89623 UKK |
261 | if (res) { |
262 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); | |
263 | if (!r) | |
264 | return -ENOMEM; | |
37c12e74 | 265 | } |
cea89623 | 266 | |
4a03d6f7 | 267 | kfree(pdev->resource); |
cea89623 UKK |
268 | pdev->resource = r; |
269 | pdev->num_resources = num; | |
270 | return 0; | |
37c12e74 RK |
271 | } |
272 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
273 | ||
274 | /** | |
3c31f07a | 275 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
276 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
277 | * @data: platform specific data for this platform device | |
278 | * @size: size of platform specific data | |
37c12e74 | 279 | * |
4a3ad20c GKH |
280 | * Add a copy of platform specific data to the platform device's |
281 | * platform_data pointer. The memory associated with the platform data | |
282 | * will be freed when the platform device is released. | |
37c12e74 | 283 | */ |
4a3ad20c GKH |
284 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
285 | size_t size) | |
37c12e74 | 286 | { |
27a33f9e | 287 | void *d = NULL; |
5cfc64ce | 288 | |
27a33f9e UKK |
289 | if (data) { |
290 | d = kmemdup(data, size, GFP_KERNEL); | |
291 | if (!d) | |
292 | return -ENOMEM; | |
37c12e74 | 293 | } |
27a33f9e | 294 | |
251e031d | 295 | kfree(pdev->dev.platform_data); |
27a33f9e UKK |
296 | pdev->dev.platform_data = d; |
297 | return 0; | |
37c12e74 RK |
298 | } |
299 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
300 | ||
301 | /** | |
4a3ad20c GKH |
302 | * platform_device_add - add a platform device to device hierarchy |
303 | * @pdev: platform device we're adding | |
1da177e4 | 304 | * |
4a3ad20c GKH |
305 | * This is part 2 of platform_device_register(), though may be called |
306 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 307 | */ |
37c12e74 | 308 | int platform_device_add(struct platform_device *pdev) |
1da177e4 | 309 | { |
689ae231 | 310 | int i, ret; |
1da177e4 LT |
311 | |
312 | if (!pdev) | |
313 | return -EINVAL; | |
314 | ||
315 | if (!pdev->dev.parent) | |
316 | pdev->dev.parent = &platform_bus; | |
317 | ||
318 | pdev->dev.bus = &platform_bus_type; | |
319 | ||
689ae231 JD |
320 | switch (pdev->id) { |
321 | default: | |
1e0b2cf9 | 322 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
689ae231 JD |
323 | break; |
324 | case PLATFORM_DEVID_NONE: | |
acc0e90f | 325 | dev_set_name(&pdev->dev, "%s", pdev->name); |
689ae231 JD |
326 | break; |
327 | case PLATFORM_DEVID_AUTO: | |
328 | /* | |
329 | * Automatically allocated device ID. We mark it as such so | |
330 | * that we remember it must be freed, and we append a suffix | |
331 | * to avoid namespace collision with explicit IDs. | |
332 | */ | |
333 | ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL); | |
334 | if (ret < 0) | |
335 | goto err_out; | |
336 | pdev->id = ret; | |
337 | pdev->id_auto = true; | |
338 | dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); | |
339 | break; | |
340 | } | |
1da177e4 LT |
341 | |
342 | for (i = 0; i < pdev->num_resources; i++) { | |
343 | struct resource *p, *r = &pdev->resource[i]; | |
344 | ||
345 | if (r->name == NULL) | |
1e0b2cf9 | 346 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
347 | |
348 | p = r->parent; | |
349 | if (!p) { | |
c9f66169 | 350 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 351 | p = &iomem_resource; |
c9f66169 | 352 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
353 | p = &ioport_resource; |
354 | } | |
355 | ||
d960bb4d | 356 | if (p && insert_resource(p, r)) { |
0258e182 | 357 | dev_err(&pdev->dev, "failed to claim resource %d\n", i); |
1da177e4 LT |
358 | ret = -EBUSY; |
359 | goto failed; | |
360 | } | |
361 | } | |
362 | ||
363 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 364 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 365 | |
e3915532 | 366 | ret = device_add(&pdev->dev); |
1da177e4 LT |
367 | if (ret == 0) |
368 | return ret; | |
369 | ||
370 | failed: | |
689ae231 JD |
371 | if (pdev->id_auto) { |
372 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
373 | pdev->id = PLATFORM_DEVID_AUTO; | |
374 | } | |
375 | ||
c9f66169 MD |
376 | while (--i >= 0) { |
377 | struct resource *r = &pdev->resource[i]; | |
378 | unsigned long type = resource_type(r); | |
379 | ||
380 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
381 | release_resource(r); | |
382 | } | |
383 | ||
689ae231 | 384 | err_out: |
1da177e4 LT |
385 | return ret; |
386 | } | |
37c12e74 RK |
387 | EXPORT_SYMBOL_GPL(platform_device_add); |
388 | ||
389 | /** | |
4a3ad20c GKH |
390 | * platform_device_del - remove a platform-level device |
391 | * @pdev: platform device we're removing | |
1da177e4 | 392 | * |
4a3ad20c GKH |
393 | * Note that this function will also release all memory- and port-based |
394 | * resources owned by the device (@dev->resource). This function must | |
395 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 396 | */ |
93ce3061 | 397 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
398 | { |
399 | int i; | |
400 | ||
401 | if (pdev) { | |
dc4c15d4 JD |
402 | device_del(&pdev->dev); |
403 | ||
689ae231 JD |
404 | if (pdev->id_auto) { |
405 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
406 | pdev->id = PLATFORM_DEVID_AUTO; | |
407 | } | |
408 | ||
1da177e4 LT |
409 | for (i = 0; i < pdev->num_resources; i++) { |
410 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
411 | unsigned long type = resource_type(r); |
412 | ||
413 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
414 | release_resource(r); |
415 | } | |
1da177e4 LT |
416 | } |
417 | } | |
93ce3061 DT |
418 | EXPORT_SYMBOL_GPL(platform_device_del); |
419 | ||
420 | /** | |
4a3ad20c GKH |
421 | * platform_device_register - add a platform-level device |
422 | * @pdev: platform device we're adding | |
93ce3061 | 423 | */ |
4a3ad20c | 424 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
425 | { |
426 | device_initialize(&pdev->dev); | |
a77ce816 | 427 | arch_setup_pdev_archdata(pdev); |
93ce3061 DT |
428 | return platform_device_add(pdev); |
429 | } | |
a96b2042 | 430 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
431 | |
432 | /** | |
4a3ad20c GKH |
433 | * platform_device_unregister - unregister a platform-level device |
434 | * @pdev: platform device we're unregistering | |
93ce3061 | 435 | * |
4a3ad20c GKH |
436 | * Unregistration is done in 2 steps. First we release all resources |
437 | * and remove it from the subsystem, then we drop reference count by | |
438 | * calling platform_device_put(). | |
93ce3061 | 439 | */ |
4a3ad20c | 440 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
441 | { |
442 | platform_device_del(pdev); | |
443 | platform_device_put(pdev); | |
444 | } | |
a96b2042 | 445 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 446 | |
1da177e4 | 447 | /** |
01dcc60a | 448 | * platform_device_register_full - add a platform-level device with |
44f28bde | 449 | * resources and platform-specific data |
49a4ec18 | 450 | * |
01dcc60a | 451 | * @pdevinfo: data used to create device |
d8bf2540 | 452 | * |
f0eae0ed | 453 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 454 | */ |
01dcc60a | 455 | struct platform_device *platform_device_register_full( |
5a3072be | 456 | const struct platform_device_info *pdevinfo) |
d8bf2540 | 457 | { |
44f28bde | 458 | int ret = -ENOMEM; |
d8bf2540 | 459 | struct platform_device *pdev; |
d8bf2540 | 460 | |
01dcc60a | 461 | pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
44f28bde | 462 | if (!pdev) |
01dcc60a UKK |
463 | goto err_alloc; |
464 | ||
465 | pdev->dev.parent = pdevinfo->parent; | |
ce793486 | 466 | pdev->dev.fwnode = pdevinfo->fwnode; |
01dcc60a UKK |
467 | |
468 | if (pdevinfo->dma_mask) { | |
469 | /* | |
470 | * This memory isn't freed when the device is put, | |
471 | * I don't have a nice idea for that though. Conceptually | |
472 | * dma_mask in struct device should not be a pointer. | |
473 | * See http://thread.gmane.org/gmane.linux.kernel.pci/9081 | |
474 | */ | |
475 | pdev->dev.dma_mask = | |
476 | kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); | |
477 | if (!pdev->dev.dma_mask) | |
478 | goto err; | |
479 | ||
480 | *pdev->dev.dma_mask = pdevinfo->dma_mask; | |
481 | pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; | |
482 | } | |
d8bf2540 | 483 | |
01dcc60a UKK |
484 | ret = platform_device_add_resources(pdev, |
485 | pdevinfo->res, pdevinfo->num_res); | |
807508c8 AV |
486 | if (ret) |
487 | goto err; | |
44f28bde | 488 | |
01dcc60a UKK |
489 | ret = platform_device_add_data(pdev, |
490 | pdevinfo->data, pdevinfo->size_data); | |
807508c8 AV |
491 | if (ret) |
492 | goto err; | |
d8bf2540 | 493 | |
44f28bde UKK |
494 | ret = platform_device_add(pdev); |
495 | if (ret) { | |
496 | err: | |
7b199811 | 497 | ACPI_COMPANION_SET(&pdev->dev, NULL); |
01dcc60a UKK |
498 | kfree(pdev->dev.dma_mask); |
499 | ||
500 | err_alloc: | |
44f28bde UKK |
501 | platform_device_put(pdev); |
502 | return ERR_PTR(ret); | |
503 | } | |
d8bf2540 DB |
504 | |
505 | return pdev; | |
d8bf2540 | 506 | } |
01dcc60a | 507 | EXPORT_SYMBOL_GPL(platform_device_register_full); |
d8bf2540 | 508 | |
00d3dcdd RK |
509 | static int platform_drv_probe(struct device *_dev) |
510 | { | |
511 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
512 | struct platform_device *dev = to_platform_device(_dev); | |
94d76d5d | 513 | int ret; |
00d3dcdd | 514 | |
86be408b SN |
515 | ret = of_clk_set_defaults(_dev->of_node, false); |
516 | if (ret < 0) | |
517 | return ret; | |
518 | ||
cb518413 UH |
519 | ret = dev_pm_domain_attach(_dev, true); |
520 | if (ret != -EPROBE_DEFER) { | |
521 | ret = drv->probe(dev); | |
522 | if (ret) | |
523 | dev_pm_domain_detach(_dev, true); | |
524 | } | |
94d76d5d | 525 | |
3f9120b0 JH |
526 | if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) { |
527 | dev_warn(_dev, "probe deferral not supported\n"); | |
528 | ret = -ENXIO; | |
529 | } | |
530 | ||
94d76d5d | 531 | return ret; |
00d3dcdd RK |
532 | } |
533 | ||
c67334fb DB |
534 | static int platform_drv_probe_fail(struct device *_dev) |
535 | { | |
536 | return -ENXIO; | |
537 | } | |
538 | ||
00d3dcdd RK |
539 | static int platform_drv_remove(struct device *_dev) |
540 | { | |
541 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
542 | struct platform_device *dev = to_platform_device(_dev); | |
94d76d5d | 543 | int ret; |
00d3dcdd | 544 | |
94d76d5d | 545 | ret = drv->remove(dev); |
cb518413 | 546 | dev_pm_domain_detach(_dev, true); |
94d76d5d RW |
547 | |
548 | return ret; | |
00d3dcdd RK |
549 | } |
550 | ||
551 | static void platform_drv_shutdown(struct device *_dev) | |
552 | { | |
553 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
554 | struct platform_device *dev = to_platform_device(_dev); | |
555 | ||
556 | drv->shutdown(dev); | |
cb518413 | 557 | dev_pm_domain_detach(_dev, true); |
00d3dcdd RK |
558 | } |
559 | ||
00d3dcdd | 560 | /** |
9447057e | 561 | * __platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 562 | * @drv: platform driver structure |
08801f96 | 563 | * @owner: owning module/driver |
00d3dcdd | 564 | */ |
9447057e LC |
565 | int __platform_driver_register(struct platform_driver *drv, |
566 | struct module *owner) | |
00d3dcdd | 567 | { |
9447057e | 568 | drv->driver.owner = owner; |
00d3dcdd RK |
569 | drv->driver.bus = &platform_bus_type; |
570 | if (drv->probe) | |
571 | drv->driver.probe = platform_drv_probe; | |
572 | if (drv->remove) | |
573 | drv->driver.remove = platform_drv_remove; | |
574 | if (drv->shutdown) | |
575 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 576 | |
00d3dcdd RK |
577 | return driver_register(&drv->driver); |
578 | } | |
9447057e | 579 | EXPORT_SYMBOL_GPL(__platform_driver_register); |
00d3dcdd RK |
580 | |
581 | /** | |
3c31f07a | 582 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 583 | * @drv: platform driver structure |
00d3dcdd RK |
584 | */ |
585 | void platform_driver_unregister(struct platform_driver *drv) | |
586 | { | |
587 | driver_unregister(&drv->driver); | |
588 | } | |
589 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
590 | ||
c67334fb | 591 | /** |
c3b50dc2 | 592 | * __platform_driver_probe - register driver for non-hotpluggable device |
c67334fb | 593 | * @drv: platform driver structure |
3f9120b0 | 594 | * @probe: the driver probe routine, probably from an __init section |
c3b50dc2 | 595 | * @module: module which will be the owner of the driver |
c67334fb DB |
596 | * |
597 | * Use this instead of platform_driver_register() when you know the device | |
598 | * is not hotpluggable and has already been registered, and you want to | |
599 | * remove its run-once probe() infrastructure from memory after the driver | |
600 | * has bound to the device. | |
601 | * | |
602 | * One typical use for this would be with drivers for controllers integrated | |
603 | * into system-on-chip processors, where the controller devices have been | |
604 | * configured as part of board setup. | |
605 | * | |
3f9120b0 | 606 | * Note that this is incompatible with deferred probing. |
647c86d0 | 607 | * |
c67334fb DB |
608 | * Returns zero if the driver registered and bound to a device, else returns |
609 | * a negative error code and with the driver not registered. | |
610 | */ | |
c3b50dc2 WS |
611 | int __init_or_module __platform_driver_probe(struct platform_driver *drv, |
612 | int (*probe)(struct platform_device *), struct module *module) | |
c67334fb DB |
613 | { |
614 | int retval, code; | |
615 | ||
3f9120b0 JH |
616 | /* |
617 | * Prevent driver from requesting probe deferral to avoid further | |
618 | * futile probe attempts. | |
619 | */ | |
620 | drv->prevent_deferred_probe = true; | |
621 | ||
1a6f2a75 DT |
622 | /* make sure driver won't have bind/unbind attributes */ |
623 | drv->driver.suppress_bind_attrs = true; | |
624 | ||
c67334fb DB |
625 | /* temporary section violation during probe() */ |
626 | drv->probe = probe; | |
c3b50dc2 | 627 | retval = code = __platform_driver_register(drv, module); |
c67334fb | 628 | |
1a6f2a75 DT |
629 | /* |
630 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
631 | * the list of drivers in order to probe new devices. Check to see |
632 | * if the probe was successful, and make sure any forced probes of | |
633 | * new devices fail. | |
634 | */ | |
d79d3244 | 635 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb | 636 | drv->probe = NULL; |
e5dd1278 | 637 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
638 | retval = -ENODEV; |
639 | drv->driver.probe = platform_drv_probe_fail; | |
d79d3244 | 640 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
641 | |
642 | if (code != retval) | |
643 | platform_driver_unregister(drv); | |
644 | return retval; | |
645 | } | |
c3b50dc2 | 646 | EXPORT_SYMBOL_GPL(__platform_driver_probe); |
1da177e4 | 647 | |
ecdf6ceb | 648 | /** |
291f653a | 649 | * __platform_create_bundle - register driver and create corresponding device |
ecdf6ceb DT |
650 | * @driver: platform driver structure |
651 | * @probe: the driver probe routine, probably from an __init section | |
652 | * @res: set of resources that needs to be allocated for the device | |
653 | * @n_res: number of resources | |
654 | * @data: platform specific data for this platform device | |
655 | * @size: size of platform specific data | |
291f653a | 656 | * @module: module which will be the owner of the driver |
ecdf6ceb DT |
657 | * |
658 | * Use this in legacy-style modules that probe hardware directly and | |
659 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
660 | * |
661 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb | 662 | */ |
291f653a | 663 | struct platform_device * __init_or_module __platform_create_bundle( |
ecdf6ceb DT |
664 | struct platform_driver *driver, |
665 | int (*probe)(struct platform_device *), | |
666 | struct resource *res, unsigned int n_res, | |
291f653a | 667 | const void *data, size_t size, struct module *module) |
ecdf6ceb DT |
668 | { |
669 | struct platform_device *pdev; | |
670 | int error; | |
671 | ||
672 | pdev = platform_device_alloc(driver->driver.name, -1); | |
673 | if (!pdev) { | |
674 | error = -ENOMEM; | |
675 | goto err_out; | |
676 | } | |
677 | ||
807508c8 AV |
678 | error = platform_device_add_resources(pdev, res, n_res); |
679 | if (error) | |
680 | goto err_pdev_put; | |
ecdf6ceb | 681 | |
807508c8 AV |
682 | error = platform_device_add_data(pdev, data, size); |
683 | if (error) | |
684 | goto err_pdev_put; | |
ecdf6ceb DT |
685 | |
686 | error = platform_device_add(pdev); | |
687 | if (error) | |
688 | goto err_pdev_put; | |
689 | ||
291f653a | 690 | error = __platform_driver_probe(driver, probe, module); |
ecdf6ceb DT |
691 | if (error) |
692 | goto err_pdev_del; | |
693 | ||
694 | return pdev; | |
695 | ||
696 | err_pdev_del: | |
697 | platform_device_del(pdev); | |
698 | err_pdev_put: | |
699 | platform_device_put(pdev); | |
700 | err_out: | |
701 | return ERR_PTR(error); | |
702 | } | |
291f653a | 703 | EXPORT_SYMBOL_GPL(__platform_create_bundle); |
ecdf6ceb | 704 | |
a0245f7a DB |
705 | /* modalias support enables more hands-off userspace setup: |
706 | * (a) environment variable lets new-style hotplug events work once system is | |
707 | * fully running: "modprobe $MODALIAS" | |
708 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
709 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
710 | */ | |
4a3ad20c GKH |
711 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
712 | char *buf) | |
a0245f7a DB |
713 | { |
714 | struct platform_device *pdev = to_platform_device(dev); | |
8c4ff6d0 ZR |
715 | int len; |
716 | ||
b9f73067 ZR |
717 | len = of_device_get_modalias(dev, buf, PAGE_SIZE -1); |
718 | if (len != -ENODEV) | |
719 | return len; | |
720 | ||
8c4ff6d0 ZR |
721 | len = acpi_device_modalias(dev, buf, PAGE_SIZE -1); |
722 | if (len != -ENODEV) | |
723 | return len; | |
724 | ||
725 | len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); | |
a0245f7a DB |
726 | |
727 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
728 | } | |
d06262e5 | 729 | static DEVICE_ATTR_RO(modalias); |
a0245f7a | 730 | |
3d713e0e KP |
731 | static ssize_t driver_override_store(struct device *dev, |
732 | struct device_attribute *attr, | |
733 | const char *buf, size_t count) | |
734 | { | |
735 | struct platform_device *pdev = to_platform_device(dev); | |
736 | char *driver_override, *old = pdev->driver_override, *cp; | |
737 | ||
738 | if (count > PATH_MAX) | |
739 | return -EINVAL; | |
740 | ||
741 | driver_override = kstrndup(buf, count, GFP_KERNEL); | |
742 | if (!driver_override) | |
743 | return -ENOMEM; | |
744 | ||
745 | cp = strchr(driver_override, '\n'); | |
746 | if (cp) | |
747 | *cp = '\0'; | |
748 | ||
749 | if (strlen(driver_override)) { | |
750 | pdev->driver_override = driver_override; | |
751 | } else { | |
752 | kfree(driver_override); | |
753 | pdev->driver_override = NULL; | |
754 | } | |
755 | ||
756 | kfree(old); | |
757 | ||
758 | return count; | |
759 | } | |
760 | ||
761 | static ssize_t driver_override_show(struct device *dev, | |
762 | struct device_attribute *attr, char *buf) | |
763 | { | |
764 | struct platform_device *pdev = to_platform_device(dev); | |
765 | ||
766 | return sprintf(buf, "%s\n", pdev->driver_override); | |
767 | } | |
768 | static DEVICE_ATTR_RW(driver_override); | |
769 | ||
770 | ||
d06262e5 GKH |
771 | static struct attribute *platform_dev_attrs[] = { |
772 | &dev_attr_modalias.attr, | |
3d713e0e | 773 | &dev_attr_driver_override.attr, |
d06262e5 | 774 | NULL, |
a0245f7a | 775 | }; |
d06262e5 | 776 | ATTRIBUTE_GROUPS(platform_dev); |
a0245f7a | 777 | |
7eff2e7a | 778 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
779 | { |
780 | struct platform_device *pdev = to_platform_device(dev); | |
eca39301 GL |
781 | int rc; |
782 | ||
783 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
0258e182 | 784 | rc = of_device_uevent_modalias(dev, env); |
eca39301 GL |
785 | if (rc != -ENODEV) |
786 | return rc; | |
a0245f7a | 787 | |
8c4ff6d0 ZR |
788 | rc = acpi_device_uevent_modalias(dev, env); |
789 | if (rc != -ENODEV) | |
790 | return rc; | |
791 | ||
57fee4a5 | 792 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
0a26813c | 793 | pdev->name); |
a0245f7a DB |
794 | return 0; |
795 | } | |
796 | ||
57fee4a5 | 797 | static const struct platform_device_id *platform_match_id( |
831fad2f | 798 | const struct platform_device_id *id, |
57fee4a5 EM |
799 | struct platform_device *pdev) |
800 | { | |
801 | while (id->name[0]) { | |
802 | if (strcmp(pdev->name, id->name) == 0) { | |
803 | pdev->id_entry = id; | |
804 | return id; | |
805 | } | |
806 | id++; | |
807 | } | |
808 | return NULL; | |
809 | } | |
810 | ||
1da177e4 | 811 | /** |
4a3ad20c GKH |
812 | * platform_match - bind platform device to platform driver. |
813 | * @dev: device. | |
814 | * @drv: driver. | |
1da177e4 | 815 | * |
4a3ad20c GKH |
816 | * Platform device IDs are assumed to be encoded like this: |
817 | * "<name><instance>", where <name> is a short description of the type of | |
818 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
819 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
820 | * "<name>". So, extract the <name> from the platform_device structure, | |
821 | * and compare it against the name of the driver. Return whether they match | |
822 | * or not. | |
1da177e4 | 823 | */ |
4a3ad20c | 824 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 825 | { |
71b3e0c1 | 826 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
827 | struct platform_driver *pdrv = to_platform_driver(drv); |
828 | ||
3d713e0e KP |
829 | /* When driver_override is set, only bind to the matching driver */ |
830 | if (pdev->driver_override) | |
831 | return !strcmp(pdev->driver_override, drv->name); | |
832 | ||
05212157 GL |
833 | /* Attempt an OF style match first */ |
834 | if (of_driver_match_device(dev, drv)) | |
835 | return 1; | |
836 | ||
91e56878 MW |
837 | /* Then try ACPI style match */ |
838 | if (acpi_driver_match_device(dev, drv)) | |
839 | return 1; | |
840 | ||
05212157 | 841 | /* Then try to match against the id table */ |
57fee4a5 EM |
842 | if (pdrv->id_table) |
843 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 844 | |
57fee4a5 | 845 | /* fall-back to driver name match */ |
1e0b2cf9 | 846 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
847 | } |
848 | ||
25e18499 RW |
849 | #ifdef CONFIG_PM_SLEEP |
850 | ||
851 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 852 | { |
783ea7d4 MD |
853 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
854 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
855 | int ret = 0; |
856 | ||
783ea7d4 MD |
857 | if (dev->driver && pdrv->suspend) |
858 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
859 | |
860 | return ret; | |
861 | } | |
862 | ||
25e18499 | 863 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 864 | { |
783ea7d4 MD |
865 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
866 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
867 | int ret = 0; |
868 | ||
783ea7d4 MD |
869 | if (dev->driver && pdrv->resume) |
870 | ret = pdrv->resume(pdev); | |
9480e307 | 871 | |
1da177e4 LT |
872 | return ret; |
873 | } | |
874 | ||
69c9dd1e | 875 | #endif /* CONFIG_PM_SLEEP */ |
9d730229 | 876 | |
25e18499 RW |
877 | #ifdef CONFIG_SUSPEND |
878 | ||
69c9dd1e | 879 | int platform_pm_suspend(struct device *dev) |
25e18499 RW |
880 | { |
881 | struct device_driver *drv = dev->driver; | |
882 | int ret = 0; | |
883 | ||
adf09493 RW |
884 | if (!drv) |
885 | return 0; | |
886 | ||
887 | if (drv->pm) { | |
25e18499 RW |
888 | if (drv->pm->suspend) |
889 | ret = drv->pm->suspend(dev); | |
890 | } else { | |
891 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
892 | } | |
893 | ||
894 | return ret; | |
895 | } | |
896 | ||
69c9dd1e | 897 | int platform_pm_resume(struct device *dev) |
25e18499 RW |
898 | { |
899 | struct device_driver *drv = dev->driver; | |
900 | int ret = 0; | |
901 | ||
adf09493 RW |
902 | if (!drv) |
903 | return 0; | |
904 | ||
905 | if (drv->pm) { | |
25e18499 RW |
906 | if (drv->pm->resume) |
907 | ret = drv->pm->resume(dev); | |
908 | } else { | |
909 | ret = platform_legacy_resume(dev); | |
910 | } | |
911 | ||
912 | return ret; | |
913 | } | |
914 | ||
69c9dd1e | 915 | #endif /* CONFIG_SUSPEND */ |
25e18499 | 916 | |
1f112cee | 917 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 | 918 | |
69c9dd1e | 919 | int platform_pm_freeze(struct device *dev) |
25e18499 RW |
920 | { |
921 | struct device_driver *drv = dev->driver; | |
922 | int ret = 0; | |
923 | ||
924 | if (!drv) | |
925 | return 0; | |
926 | ||
927 | if (drv->pm) { | |
928 | if (drv->pm->freeze) | |
929 | ret = drv->pm->freeze(dev); | |
930 | } else { | |
931 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
932 | } | |
933 | ||
934 | return ret; | |
935 | } | |
936 | ||
69c9dd1e | 937 | int platform_pm_thaw(struct device *dev) |
25e18499 RW |
938 | { |
939 | struct device_driver *drv = dev->driver; | |
940 | int ret = 0; | |
941 | ||
adf09493 RW |
942 | if (!drv) |
943 | return 0; | |
944 | ||
945 | if (drv->pm) { | |
25e18499 RW |
946 | if (drv->pm->thaw) |
947 | ret = drv->pm->thaw(dev); | |
948 | } else { | |
949 | ret = platform_legacy_resume(dev); | |
950 | } | |
951 | ||
952 | return ret; | |
953 | } | |
954 | ||
69c9dd1e | 955 | int platform_pm_poweroff(struct device *dev) |
25e18499 RW |
956 | { |
957 | struct device_driver *drv = dev->driver; | |
958 | int ret = 0; | |
959 | ||
adf09493 RW |
960 | if (!drv) |
961 | return 0; | |
962 | ||
963 | if (drv->pm) { | |
25e18499 RW |
964 | if (drv->pm->poweroff) |
965 | ret = drv->pm->poweroff(dev); | |
966 | } else { | |
967 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
968 | } | |
969 | ||
970 | return ret; | |
971 | } | |
972 | ||
69c9dd1e | 973 | int platform_pm_restore(struct device *dev) |
25e18499 RW |
974 | { |
975 | struct device_driver *drv = dev->driver; | |
976 | int ret = 0; | |
977 | ||
adf09493 RW |
978 | if (!drv) |
979 | return 0; | |
980 | ||
981 | if (drv->pm) { | |
25e18499 RW |
982 | if (drv->pm->restore) |
983 | ret = drv->pm->restore(dev); | |
984 | } else { | |
985 | ret = platform_legacy_resume(dev); | |
986 | } | |
987 | ||
988 | return ret; | |
989 | } | |
990 | ||
69c9dd1e | 991 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 992 | |
d9ab7716 | 993 | static const struct dev_pm_ops platform_dev_pm_ops = { |
8b313a38 RW |
994 | .runtime_suspend = pm_generic_runtime_suspend, |
995 | .runtime_resume = pm_generic_runtime_resume, | |
69c9dd1e | 996 | USE_PLATFORM_PM_SLEEP_OPS |
25e18499 RW |
997 | }; |
998 | ||
1da177e4 LT |
999 | struct bus_type platform_bus_type = { |
1000 | .name = "platform", | |
d06262e5 | 1001 | .dev_groups = platform_dev_groups, |
1da177e4 | 1002 | .match = platform_match, |
a0245f7a | 1003 | .uevent = platform_uevent, |
9d730229 | 1004 | .pm = &platform_dev_pm_ops, |
1da177e4 | 1005 | }; |
a96b2042 | 1006 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
1007 | |
1008 | int __init platform_bus_init(void) | |
1009 | { | |
fbfb1445 CH |
1010 | int error; |
1011 | ||
13977091 MD |
1012 | early_platform_cleanup(); |
1013 | ||
fbfb1445 CH |
1014 | error = device_register(&platform_bus); |
1015 | if (error) | |
1016 | return error; | |
1017 | error = bus_register(&platform_bus_type); | |
1018 | if (error) | |
1019 | device_unregister(&platform_bus); | |
801d728c | 1020 | of_platform_register_reconfig_notifier(); |
fbfb1445 | 1021 | return error; |
1da177e4 LT |
1022 | } |
1023 | ||
1024 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
1025 | u64 dma_get_required_mask(struct device *dev) | |
1026 | { | |
1027 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
1028 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
1029 | u64 mask; | |
1030 | ||
1031 | if (!high_totalram) { | |
1032 | /* convert to mask just covering totalram */ | |
1033 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
1034 | low_totalram += low_totalram - 1; | |
1035 | mask = low_totalram; | |
1036 | } else { | |
1037 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
1038 | high_totalram += high_totalram - 1; | |
1039 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
1040 | } | |
e88a0c2c | 1041 | return mask; |
1da177e4 LT |
1042 | } |
1043 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
1044 | #endif | |
13977091 MD |
1045 | |
1046 | static __initdata LIST_HEAD(early_platform_driver_list); | |
1047 | static __initdata LIST_HEAD(early_platform_device_list); | |
1048 | ||
1049 | /** | |
4d26e139 | 1050 | * early_platform_driver_register - register early platform driver |
d86c1302 | 1051 | * @epdrv: early_platform driver structure |
13977091 | 1052 | * @buf: string passed from early_param() |
4d26e139 MD |
1053 | * |
1054 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
1055 | */ |
1056 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
1057 | char *buf) | |
1058 | { | |
c60e0504 | 1059 | char *tmp; |
13977091 MD |
1060 | int n; |
1061 | ||
1062 | /* Simply add the driver to the end of the global list. | |
1063 | * Drivers will by default be put on the list in compiled-in order. | |
1064 | */ | |
1065 | if (!epdrv->list.next) { | |
1066 | INIT_LIST_HEAD(&epdrv->list); | |
1067 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
1068 | } | |
1069 | ||
1070 | /* If the user has specified device then make sure the driver | |
1071 | * gets prioritized. The driver of the last device specified on | |
1072 | * command line will be put first on the list. | |
1073 | */ | |
1074 | n = strlen(epdrv->pdrv->driver.name); | |
1075 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
1076 | list_move(&epdrv->list, &early_platform_driver_list); | |
1077 | ||
c60e0504 MD |
1078 | /* Allow passing parameters after device name */ |
1079 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 1080 | epdrv->requested_id = -1; |
c60e0504 MD |
1081 | else { |
1082 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
1083 | &tmp, 10); | |
1084 | ||
1085 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
1086 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
1087 | n = 0; | |
1088 | } else | |
1089 | n += strcspn(&buf[n + 1], ",") + 1; | |
1090 | } | |
1091 | ||
1092 | if (buf[n] == ',') | |
1093 | n++; | |
1094 | ||
1095 | if (epdrv->bufsize) { | |
1096 | memcpy(epdrv->buffer, &buf[n], | |
1097 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
1098 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
1099 | } | |
13977091 MD |
1100 | } |
1101 | ||
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | /** | |
4d26e139 | 1106 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
1107 | * @devs: array of early platform devices to add |
1108 | * @num: number of early platform devices in array | |
4d26e139 MD |
1109 | * |
1110 | * Used by early architecture code to register early platform devices and | |
1111 | * their platform data. | |
13977091 MD |
1112 | */ |
1113 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1114 | { | |
1115 | struct device *dev; | |
1116 | int i; | |
1117 | ||
1118 | /* simply add the devices to list */ | |
1119 | for (i = 0; i < num; i++) { | |
1120 | dev = &devs[i]->dev; | |
1121 | ||
1122 | if (!dev->devres_head.next) { | |
bed2b42d | 1123 | pm_runtime_early_init(dev); |
13977091 MD |
1124 | INIT_LIST_HEAD(&dev->devres_head); |
1125 | list_add_tail(&dev->devres_head, | |
1126 | &early_platform_device_list); | |
1127 | } | |
1128 | } | |
1129 | } | |
1130 | ||
1131 | /** | |
4d26e139 | 1132 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 1133 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
1134 | * |
1135 | * Used by architecture code to register all early platform drivers | |
1136 | * for a certain class. If omitted then only early platform drivers | |
1137 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
1138 | */ |
1139 | void __init early_platform_driver_register_all(char *class_str) | |
1140 | { | |
1141 | /* The "class_str" parameter may or may not be present on the kernel | |
1142 | * command line. If it is present then there may be more than one | |
1143 | * matching parameter. | |
1144 | * | |
1145 | * Since we register our early platform drivers using early_param() | |
1146 | * we need to make sure that they also get registered in the case | |
1147 | * when the parameter is missing from the kernel command line. | |
1148 | * | |
1149 | * We use parse_early_options() to make sure the early_param() gets | |
1150 | * called at least once. The early_param() may be called more than | |
1151 | * once since the name of the preferred device may be specified on | |
1152 | * the kernel command line. early_platform_driver_register() handles | |
1153 | * this case for us. | |
1154 | */ | |
1155 | parse_early_options(class_str); | |
1156 | } | |
1157 | ||
1158 | /** | |
4d26e139 | 1159 | * early_platform_match - find early platform device matching driver |
d86c1302 | 1160 | * @epdrv: early platform driver structure |
13977091 MD |
1161 | * @id: id to match against |
1162 | */ | |
a8257910 | 1163 | static struct platform_device * __init |
13977091 MD |
1164 | early_platform_match(struct early_platform_driver *epdrv, int id) |
1165 | { | |
1166 | struct platform_device *pd; | |
1167 | ||
1168 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1169 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1170 | if (pd->id == id) | |
1171 | return pd; | |
1172 | ||
1173 | return NULL; | |
1174 | } | |
1175 | ||
1176 | /** | |
4d26e139 | 1177 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1178 | * @epdrv: early platform driver structure |
13977091 MD |
1179 | * @id: return true if id or above exists |
1180 | */ | |
a8257910 | 1181 | static int __init early_platform_left(struct early_platform_driver *epdrv, |
13977091 MD |
1182 | int id) |
1183 | { | |
1184 | struct platform_device *pd; | |
1185 | ||
1186 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1187 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1188 | if (pd->id >= id) | |
1189 | return 1; | |
1190 | ||
1191 | return 0; | |
1192 | } | |
1193 | ||
1194 | /** | |
4d26e139 | 1195 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1196 | * @class_str: string to identify early platform driver class |
1197 | * @id: id to match against | |
1198 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1199 | */ | |
1200 | static int __init early_platform_driver_probe_id(char *class_str, | |
1201 | int id, | |
1202 | int nr_probe) | |
1203 | { | |
1204 | struct early_platform_driver *epdrv; | |
1205 | struct platform_device *match; | |
1206 | int match_id; | |
1207 | int n = 0; | |
1208 | int left = 0; | |
1209 | ||
1210 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1211 | /* only use drivers matching our class_str */ | |
1212 | if (strcmp(class_str, epdrv->class_str)) | |
1213 | continue; | |
1214 | ||
1215 | if (id == -2) { | |
1216 | match_id = epdrv->requested_id; | |
1217 | left = 1; | |
1218 | ||
1219 | } else { | |
1220 | match_id = id; | |
1221 | left += early_platform_left(epdrv, id); | |
1222 | ||
1223 | /* skip requested id */ | |
1224 | switch (epdrv->requested_id) { | |
1225 | case EARLY_PLATFORM_ID_ERROR: | |
1226 | case EARLY_PLATFORM_ID_UNSET: | |
1227 | break; | |
1228 | default: | |
1229 | if (epdrv->requested_id == id) | |
1230 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1231 | } | |
1232 | } | |
1233 | ||
1234 | switch (match_id) { | |
1235 | case EARLY_PLATFORM_ID_ERROR: | |
0258e182 FP |
1236 | pr_warn("%s: unable to parse %s parameter\n", |
1237 | class_str, epdrv->pdrv->driver.name); | |
13977091 MD |
1238 | /* fall-through */ |
1239 | case EARLY_PLATFORM_ID_UNSET: | |
1240 | match = NULL; | |
1241 | break; | |
1242 | default: | |
1243 | match = early_platform_match(epdrv, match_id); | |
1244 | } | |
1245 | ||
1246 | if (match) { | |
a636ee7f PM |
1247 | /* |
1248 | * Set up a sensible init_name to enable | |
1249 | * dev_name() and others to be used before the | |
1250 | * rest of the driver core is initialized. | |
1251 | */ | |
06fe53be | 1252 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1253 | if (match->id != -1) |
bd05086b PM |
1254 | match->dev.init_name = |
1255 | kasprintf(GFP_KERNEL, "%s.%d", | |
1256 | match->name, | |
1257 | match->id); | |
a636ee7f | 1258 | else |
bd05086b PM |
1259 | match->dev.init_name = |
1260 | kasprintf(GFP_KERNEL, "%s", | |
1261 | match->name); | |
a636ee7f | 1262 | |
a636ee7f PM |
1263 | if (!match->dev.init_name) |
1264 | return -ENOMEM; | |
1265 | } | |
bd05086b | 1266 | |
13977091 | 1267 | if (epdrv->pdrv->probe(match)) |
0258e182 FP |
1268 | pr_warn("%s: unable to probe %s early.\n", |
1269 | class_str, match->name); | |
13977091 MD |
1270 | else |
1271 | n++; | |
1272 | } | |
1273 | ||
1274 | if (n >= nr_probe) | |
1275 | break; | |
1276 | } | |
1277 | ||
1278 | if (left) | |
1279 | return n; | |
1280 | else | |
1281 | return -ENODEV; | |
1282 | } | |
1283 | ||
1284 | /** | |
4d26e139 | 1285 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1286 | * @class_str: string to identify early platform driver class |
1287 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1288 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1289 | * |
1290 | * Used by architecture code to probe registered early platform drivers | |
1291 | * within a certain class. For probe to happen a registered early platform | |
1292 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1293 | */ |
1294 | int __init early_platform_driver_probe(char *class_str, | |
1295 | int nr_probe, | |
1296 | int user_only) | |
1297 | { | |
1298 | int k, n, i; | |
1299 | ||
1300 | n = 0; | |
1301 | for (i = -2; n < nr_probe; i++) { | |
1302 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1303 | ||
1304 | if (k < 0) | |
1305 | break; | |
1306 | ||
1307 | n += k; | |
1308 | ||
1309 | if (user_only) | |
1310 | break; | |
1311 | } | |
1312 | ||
1313 | return n; | |
1314 | } | |
1315 | ||
1316 | /** | |
1317 | * early_platform_cleanup - clean up early platform code | |
1318 | */ | |
1319 | void __init early_platform_cleanup(void) | |
1320 | { | |
1321 | struct platform_device *pd, *pd2; | |
1322 | ||
1323 | /* clean up the devres list used to chain devices */ | |
1324 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1325 | dev.devres_head) { | |
1326 | list_del(&pd->dev.devres_head); | |
1327 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1328 | } | |
1329 | } | |
1330 |