Commit | Line | Data |
---|---|---|
989d42e8 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * platform.c - platform 'pseudo' bus for legacy devices | |
4 | * | |
5 | * Copyright (c) 2002-3 Patrick Mochel | |
6 | * Copyright (c) 2002-3 Open Source Development Labs | |
7 | * | |
fe34c89d | 8 | * Please see Documentation/driver-api/driver-model/platform.rst for more |
1da177e4 LT |
9 | * information. |
10 | */ | |
11 | ||
daa41226 | 12 | #include <linux/string.h> |
d052d1be | 13 | #include <linux/platform_device.h> |
05212157 | 14 | #include <linux/of_device.h> |
9ec36caf | 15 | #include <linux/of_irq.h> |
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <linux/init.h> | |
e15f2fa9 JG |
18 | #include <linux/interrupt.h> |
19 | #include <linux/ioport.h> | |
1da177e4 | 20 | #include <linux/dma-mapping.h> |
57c8a661 | 21 | #include <linux/memblock.h> |
1da177e4 | 22 | #include <linux/err.h> |
4e57b681 | 23 | #include <linux/slab.h> |
9d730229 | 24 | #include <linux/pm_runtime.h> |
f48c767c | 25 | #include <linux/pm_domain.h> |
689ae231 | 26 | #include <linux/idr.h> |
91e56878 | 27 | #include <linux/acpi.h> |
86be408b | 28 | #include <linux/clk/clk-conf.h> |
3d713e0e | 29 | #include <linux/limits.h> |
00bbc1d8 | 30 | #include <linux/property.h> |
967d3010 | 31 | #include <linux/kmemleak.h> |
39cc539f | 32 | #include <linux/types.h> |
1da177e4 | 33 | |
a1bdc7aa | 34 | #include "base.h" |
bed2b42d | 35 | #include "power/power.h" |
a1bdc7aa | 36 | |
689ae231 JD |
37 | /* For automatically allocated device IDs */ |
38 | static DEFINE_IDA(platform_devid_ida); | |
39 | ||
1da177e4 | 40 | struct device platform_bus = { |
1e0b2cf9 | 41 | .init_name = "platform", |
1da177e4 | 42 | }; |
a96b2042 | 43 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 LT |
44 | |
45 | /** | |
4a3ad20c GKH |
46 | * platform_get_resource - get a resource for a device |
47 | * @dev: platform device | |
48 | * @type: resource type | |
49 | * @num: resource index | |
0c7a6b91 SB |
50 | * |
51 | * Return: a pointer to the resource or NULL on failure. | |
1da177e4 | 52 | */ |
4a3ad20c GKH |
53 | struct resource *platform_get_resource(struct platform_device *dev, |
54 | unsigned int type, unsigned int num) | |
1da177e4 | 55 | { |
39cc539f | 56 | u32 i; |
1da177e4 LT |
57 | |
58 | for (i = 0; i < dev->num_resources; i++) { | |
59 | struct resource *r = &dev->resource[i]; | |
60 | ||
c9f66169 MD |
61 | if (type == resource_type(r) && num-- == 0) |
62 | return r; | |
1da177e4 LT |
63 | } |
64 | return NULL; | |
65 | } | |
a96b2042 | 66 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 | 67 | |
0aec2da4 AS |
68 | struct resource *platform_get_mem_or_io(struct platform_device *dev, |
69 | unsigned int num) | |
70 | { | |
71 | u32 i; | |
72 | ||
73 | for (i = 0; i < dev->num_resources; i++) { | |
74 | struct resource *r = &dev->resource[i]; | |
75 | ||
76 | if ((resource_type(r) & (IORESOURCE_MEM|IORESOURCE_IO)) && num-- == 0) | |
77 | return r; | |
78 | } | |
79 | return NULL; | |
80 | } | |
81 | EXPORT_SYMBOL_GPL(platform_get_mem_or_io); | |
82 | ||
bb6243b4 | 83 | #ifdef CONFIG_HAS_IOMEM |
890cc39a DZ |
84 | /** |
85 | * devm_platform_get_and_ioremap_resource - call devm_ioremap_resource() for a | |
86 | * platform device and get resource | |
87 | * | |
88 | * @pdev: platform device to use both for memory resource lookup as well as | |
89 | * resource management | |
90 | * @index: resource index | |
91 | * @res: optional output parameter to store a pointer to the obtained resource. | |
0c7a6b91 SB |
92 | * |
93 | * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code | |
94 | * on failure. | |
890cc39a DZ |
95 | */ |
96 | void __iomem * | |
97 | devm_platform_get_and_ioremap_resource(struct platform_device *pdev, | |
98 | unsigned int index, struct resource **res) | |
99 | { | |
100 | struct resource *r; | |
101 | ||
102 | r = platform_get_resource(pdev, IORESOURCE_MEM, index); | |
103 | if (res) | |
104 | *res = r; | |
105 | return devm_ioremap_resource(&pdev->dev, r); | |
106 | } | |
107 | EXPORT_SYMBOL_GPL(devm_platform_get_and_ioremap_resource); | |
108 | ||
7945f929 BG |
109 | /** |
110 | * devm_platform_ioremap_resource - call devm_ioremap_resource() for a platform | |
111 | * device | |
112 | * | |
113 | * @pdev: platform device to use both for memory resource lookup as well as | |
7067c96e | 114 | * resource management |
7945f929 | 115 | * @index: resource index |
0c7a6b91 SB |
116 | * |
117 | * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code | |
118 | * on failure. | |
7945f929 BG |
119 | */ |
120 | void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev, | |
121 | unsigned int index) | |
122 | { | |
fd78901c | 123 | return devm_platform_get_and_ioremap_resource(pdev, index, NULL); |
7945f929 BG |
124 | } |
125 | EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource); | |
bb6243b4 BG |
126 | |
127 | /** | |
128 | * devm_platform_ioremap_resource_wc - write-combined variant of | |
129 | * devm_platform_ioremap_resource() | |
130 | * | |
131 | * @pdev: platform device to use both for memory resource lookup as well as | |
132 | * resource management | |
133 | * @index: resource index | |
0c7a6b91 SB |
134 | * |
135 | * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code | |
136 | * on failure. | |
bb6243b4 BG |
137 | */ |
138 | void __iomem *devm_platform_ioremap_resource_wc(struct platform_device *pdev, | |
139 | unsigned int index) | |
140 | { | |
141 | struct resource *res; | |
142 | ||
143 | res = platform_get_resource(pdev, IORESOURCE_MEM, index); | |
144 | return devm_ioremap_resource_wc(&pdev->dev, res); | |
145 | } | |
c9c8641d BG |
146 | |
147 | /** | |
148 | * devm_platform_ioremap_resource_byname - call devm_ioremap_resource for | |
149 | * a platform device, retrieve the | |
150 | * resource by name | |
151 | * | |
152 | * @pdev: platform device to use both for memory resource lookup as well as | |
153 | * resource management | |
154 | * @name: name of the resource | |
0c7a6b91 SB |
155 | * |
156 | * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code | |
157 | * on failure. | |
c9c8641d BG |
158 | */ |
159 | void __iomem * | |
160 | devm_platform_ioremap_resource_byname(struct platform_device *pdev, | |
161 | const char *name) | |
162 | { | |
163 | struct resource *res; | |
164 | ||
165 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name); | |
166 | return devm_ioremap_resource(&pdev->dev, res); | |
167 | } | |
168 | EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource_byname); | |
837ccda3 | 169 | #endif /* CONFIG_HAS_IOMEM */ |
7945f929 | 170 | |
ec4e2906 UKK |
171 | /** |
172 | * platform_get_irq_optional - get an optional IRQ for a device | |
173 | * @dev: platform device | |
174 | * @num: IRQ number index | |
175 | * | |
176 | * Gets an IRQ for a platform device. Device drivers should check the return | |
177 | * value for errors so as to not pass a negative integer value to the | |
178 | * request_irq() APIs. This is the same as platform_get_irq(), except that it | |
179 | * does not print an error message if an IRQ can not be obtained. | |
180 | * | |
f0825246 MCC |
181 | * For example:: |
182 | * | |
ec4e2906 UKK |
183 | * int irq = platform_get_irq_optional(pdev, 0); |
184 | * if (irq < 0) | |
185 | * return irq; | |
186 | * | |
a85a6c86 | 187 | * Return: non-zero IRQ number on success, negative error number on failure. |
ec4e2906 UKK |
188 | */ |
189 | int platform_get_irq_optional(struct platform_device *dev, unsigned int num) | |
1da177e4 | 190 | { |
a85a6c86 | 191 | int ret; |
5cf8f7db AL |
192 | #ifdef CONFIG_SPARC |
193 | /* sparc does not have irqs represented as IORESOURCE_IRQ resources */ | |
194 | if (!dev || num >= dev->archdata.num_irqs) | |
195 | return -ENXIO; | |
a85a6c86 BH |
196 | ret = dev->archdata.irqs[num]; |
197 | goto out; | |
5cf8f7db | 198 | #else |
9ec36caf | 199 | struct resource *r; |
aff008ad | 200 | |
71564a26 | 201 | if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) { |
aff008ad | 202 | ret = of_irq_get(dev->dev.of_node, num); |
e330b9a6 | 203 | if (ret > 0 || ret == -EPROBE_DEFER) |
a85a6c86 | 204 | goto out; |
aff008ad | 205 | } |
9ec36caf RH |
206 | |
207 | r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
d44fa3d4 AVF |
208 | if (has_acpi_companion(&dev->dev)) { |
209 | if (r && r->flags & IORESOURCE_DISABLED) { | |
d44fa3d4 AVF |
210 | ret = acpi_irq_get(ACPI_HANDLE(&dev->dev), num, r); |
211 | if (ret) | |
a85a6c86 | 212 | goto out; |
d44fa3d4 AVF |
213 | } |
214 | } | |
215 | ||
7085a740 LW |
216 | /* |
217 | * The resources may pass trigger flags to the irqs that need | |
218 | * to be set up. It so happens that the trigger flags for | |
219 | * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER* | |
220 | * settings. | |
221 | */ | |
60ca5e0d GR |
222 | if (r && r->flags & IORESOURCE_BITS) { |
223 | struct irq_data *irqd; | |
224 | ||
225 | irqd = irq_get_irq_data(r->start); | |
a85a6c86 BH |
226 | if (!irqd) { |
227 | ret = -ENXIO; | |
228 | goto out; | |
229 | } | |
60ca5e0d GR |
230 | irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS); |
231 | } | |
1da177e4 | 232 | |
a85a6c86 BH |
233 | if (r) { |
234 | ret = r->start; | |
235 | goto out; | |
236 | } | |
daaef255 EG |
237 | |
238 | /* | |
239 | * For the index 0 interrupt, allow falling back to GpioInt | |
240 | * resources. While a device could have both Interrupt and GpioInt | |
241 | * resources, making this fallback ambiguous, in many common cases | |
242 | * the device will only expose one IRQ, and this fallback | |
243 | * allows a common code path across either kind of resource. | |
244 | */ | |
46c42d84 | 245 | if (num == 0 && has_acpi_companion(&dev->dev)) { |
71564a26 | 246 | ret = acpi_dev_gpio_irq_get(ACPI_COMPANION(&dev->dev), num); |
46c42d84 BN |
247 | /* Our callers expect -ENXIO for missing IRQs. */ |
248 | if (ret >= 0 || ret == -EPROBE_DEFER) | |
a85a6c86 | 249 | goto out; |
46c42d84 | 250 | } |
daaef255 | 251 | |
a85a6c86 | 252 | ret = -ENXIO; |
5cf8f7db | 253 | #endif |
a85a6c86 BH |
254 | out: |
255 | WARN(ret == 0, "0 is an invalid IRQ number\n"); | |
256 | return ret; | |
1da177e4 | 257 | } |
ec4e2906 | 258 | EXPORT_SYMBOL_GPL(platform_get_irq_optional); |
7723f4c5 SB |
259 | |
260 | /** | |
261 | * platform_get_irq - get an IRQ for a device | |
262 | * @dev: platform device | |
263 | * @num: IRQ number index | |
264 | * | |
265 | * Gets an IRQ for a platform device and prints an error message if finding the | |
266 | * IRQ fails. Device drivers should check the return value for errors so as to | |
267 | * not pass a negative integer value to the request_irq() APIs. | |
268 | * | |
f0825246 MCC |
269 | * For example:: |
270 | * | |
7723f4c5 SB |
271 | * int irq = platform_get_irq(pdev, 0); |
272 | * if (irq < 0) | |
273 | * return irq; | |
274 | * | |
a85a6c86 | 275 | * Return: non-zero IRQ number on success, negative error number on failure. |
7723f4c5 SB |
276 | */ |
277 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
278 | { | |
279 | int ret; | |
280 | ||
ec4e2906 | 281 | ret = platform_get_irq_optional(dev, num); |
7723f4c5 SB |
282 | if (ret < 0 && ret != -EPROBE_DEFER) |
283 | dev_err(&dev->dev, "IRQ index %u not found\n", num); | |
284 | ||
285 | return ret; | |
286 | } | |
a96b2042 | 287 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 | 288 | |
4b83555d SB |
289 | /** |
290 | * platform_irq_count - Count the number of IRQs a platform device uses | |
291 | * @dev: platform device | |
292 | * | |
293 | * Return: Number of IRQs a platform device uses or EPROBE_DEFER | |
294 | */ | |
295 | int platform_irq_count(struct platform_device *dev) | |
296 | { | |
297 | int ret, nr = 0; | |
298 | ||
ec4e2906 | 299 | while ((ret = platform_get_irq_optional(dev, nr)) >= 0) |
4b83555d SB |
300 | nr++; |
301 | ||
302 | if (ret == -EPROBE_DEFER) | |
303 | return ret; | |
304 | ||
305 | return nr; | |
306 | } | |
307 | EXPORT_SYMBOL_GPL(platform_irq_count); | |
308 | ||
e15f2fa9 JG |
309 | struct irq_affinity_devres { |
310 | unsigned int count; | |
311 | unsigned int irq[]; | |
312 | }; | |
313 | ||
314 | static void platform_disable_acpi_irq(struct platform_device *pdev, int index) | |
315 | { | |
316 | struct resource *r; | |
317 | ||
318 | r = platform_get_resource(pdev, IORESOURCE_IRQ, index); | |
319 | if (r) | |
320 | irqresource_disabled(r, 0); | |
321 | } | |
322 | ||
323 | static void devm_platform_get_irqs_affinity_release(struct device *dev, | |
324 | void *res) | |
325 | { | |
326 | struct irq_affinity_devres *ptr = res; | |
327 | int i; | |
328 | ||
329 | for (i = 0; i < ptr->count; i++) { | |
330 | irq_dispose_mapping(ptr->irq[i]); | |
331 | ||
332 | if (has_acpi_companion(dev)) | |
333 | platform_disable_acpi_irq(to_platform_device(dev), i); | |
334 | } | |
335 | } | |
336 | ||
337 | /** | |
338 | * devm_platform_get_irqs_affinity - devm method to get a set of IRQs for a | |
339 | * device using an interrupt affinity descriptor | |
340 | * @dev: platform device pointer | |
341 | * @affd: affinity descriptor | |
342 | * @minvec: minimum count of interrupt vectors | |
343 | * @maxvec: maximum count of interrupt vectors | |
344 | * @irqs: pointer holder for IRQ numbers | |
345 | * | |
346 | * Gets a set of IRQs for a platform device, and updates IRQ afffinty according | |
347 | * to the passed affinity descriptor | |
348 | * | |
349 | * Return: Number of vectors on success, negative error number on failure. | |
350 | */ | |
351 | int devm_platform_get_irqs_affinity(struct platform_device *dev, | |
352 | struct irq_affinity *affd, | |
353 | unsigned int minvec, | |
354 | unsigned int maxvec, | |
355 | int **irqs) | |
356 | { | |
357 | struct irq_affinity_devres *ptr; | |
358 | struct irq_affinity_desc *desc; | |
359 | size_t size; | |
360 | int i, ret, nvec; | |
361 | ||
362 | if (!affd) | |
363 | return -EPERM; | |
364 | ||
365 | if (maxvec < minvec) | |
366 | return -ERANGE; | |
367 | ||
368 | nvec = platform_irq_count(dev); | |
e1dc2099 JG |
369 | if (nvec < 0) |
370 | return nvec; | |
e15f2fa9 JG |
371 | |
372 | if (nvec < minvec) | |
373 | return -ENOSPC; | |
374 | ||
375 | nvec = irq_calc_affinity_vectors(minvec, nvec, affd); | |
376 | if (nvec < minvec) | |
377 | return -ENOSPC; | |
378 | ||
379 | if (nvec > maxvec) | |
380 | nvec = maxvec; | |
381 | ||
382 | size = sizeof(*ptr) + sizeof(unsigned int) * nvec; | |
383 | ptr = devres_alloc(devm_platform_get_irqs_affinity_release, size, | |
384 | GFP_KERNEL); | |
385 | if (!ptr) | |
386 | return -ENOMEM; | |
387 | ||
388 | ptr->count = nvec; | |
389 | ||
390 | for (i = 0; i < nvec; i++) { | |
391 | int irq = platform_get_irq(dev, i); | |
392 | if (irq < 0) { | |
393 | ret = irq; | |
394 | goto err_free_devres; | |
395 | } | |
396 | ptr->irq[i] = irq; | |
397 | } | |
398 | ||
399 | desc = irq_create_affinity_masks(nvec, affd); | |
400 | if (!desc) { | |
401 | ret = -ENOMEM; | |
402 | goto err_free_devres; | |
403 | } | |
404 | ||
405 | for (i = 0; i < nvec; i++) { | |
406 | ret = irq_update_affinity_desc(ptr->irq[i], &desc[i]); | |
407 | if (ret) { | |
408 | dev_err(&dev->dev, "failed to update irq%d affinity descriptor (%d)\n", | |
409 | ptr->irq[i], ret); | |
410 | goto err_free_desc; | |
411 | } | |
412 | } | |
413 | ||
414 | devres_add(&dev->dev, ptr); | |
415 | ||
416 | kfree(desc); | |
417 | ||
418 | *irqs = ptr->irq; | |
419 | ||
420 | return nvec; | |
421 | ||
422 | err_free_desc: | |
423 | kfree(desc); | |
424 | err_free_devres: | |
425 | devres_free(ptr); | |
426 | return ret; | |
427 | } | |
428 | EXPORT_SYMBOL_GPL(devm_platform_get_irqs_affinity); | |
429 | ||
1da177e4 | 430 | /** |
4a3ad20c GKH |
431 | * platform_get_resource_byname - get a resource for a device by name |
432 | * @dev: platform device | |
433 | * @type: resource type | |
434 | * @name: resource name | |
1da177e4 | 435 | */ |
4a3ad20c | 436 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
437 | unsigned int type, |
438 | const char *name) | |
1da177e4 | 439 | { |
39cc539f | 440 | u32 i; |
1da177e4 LT |
441 | |
442 | for (i = 0; i < dev->num_resources; i++) { | |
443 | struct resource *r = &dev->resource[i]; | |
444 | ||
1b8cb929 PU |
445 | if (unlikely(!r->name)) |
446 | continue; | |
447 | ||
c9f66169 MD |
448 | if (type == resource_type(r) && !strcmp(r->name, name)) |
449 | return r; | |
1da177e4 LT |
450 | } |
451 | return NULL; | |
452 | } | |
a96b2042 | 453 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 | 454 | |
f1da567f HG |
455 | static int __platform_get_irq_byname(struct platform_device *dev, |
456 | const char *name) | |
1da177e4 | 457 | { |
ad69674e | 458 | struct resource *r; |
71564a26 | 459 | int ret; |
ad69674e | 460 | |
aff008ad | 461 | if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) { |
aff008ad | 462 | ret = of_irq_get_byname(dev->dev.of_node, name); |
e330b9a6 | 463 | if (ret > 0 || ret == -EPROBE_DEFER) |
aff008ad GR |
464 | return ret; |
465 | } | |
1da177e4 | 466 | |
ad69674e | 467 | r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name); |
a85a6c86 BH |
468 | if (r) { |
469 | WARN(r->start == 0, "0 is an invalid IRQ number\n"); | |
7723f4c5 | 470 | return r->start; |
a85a6c86 | 471 | } |
7723f4c5 | 472 | |
7723f4c5 | 473 | return -ENXIO; |
1da177e4 | 474 | } |
f1da567f HG |
475 | |
476 | /** | |
477 | * platform_get_irq_byname - get an IRQ for a device by name | |
478 | * @dev: platform device | |
479 | * @name: IRQ name | |
480 | * | |
481 | * Get an IRQ like platform_get_irq(), but then by name rather then by index. | |
482 | * | |
a85a6c86 | 483 | * Return: non-zero IRQ number on success, negative error number on failure. |
f1da567f HG |
484 | */ |
485 | int platform_get_irq_byname(struct platform_device *dev, const char *name) | |
486 | { | |
487 | int ret; | |
488 | ||
489 | ret = __platform_get_irq_byname(dev, name); | |
490 | if (ret < 0 && ret != -EPROBE_DEFER) | |
491 | dev_err(&dev->dev, "IRQ %s not found\n", name); | |
492 | ||
493 | return ret; | |
494 | } | |
a96b2042 | 495 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 | 496 | |
f1da567f HG |
497 | /** |
498 | * platform_get_irq_byname_optional - get an optional IRQ for a device by name | |
499 | * @dev: platform device | |
500 | * @name: IRQ name | |
501 | * | |
502 | * Get an optional IRQ by name like platform_get_irq_byname(). Except that it | |
503 | * does not print an error message if an IRQ can not be obtained. | |
504 | * | |
a85a6c86 | 505 | * Return: non-zero IRQ number on success, negative error number on failure. |
f1da567f HG |
506 | */ |
507 | int platform_get_irq_byname_optional(struct platform_device *dev, | |
508 | const char *name) | |
509 | { | |
510 | return __platform_get_irq_byname(dev, name); | |
511 | } | |
512 | EXPORT_SYMBOL_GPL(platform_get_irq_byname_optional); | |
513 | ||
1da177e4 | 514 | /** |
4a3ad20c GKH |
515 | * platform_add_devices - add a numbers of platform devices |
516 | * @devs: array of platform devices to add | |
517 | * @num: number of platform devices in array | |
1da177e4 LT |
518 | */ |
519 | int platform_add_devices(struct platform_device **devs, int num) | |
520 | { | |
521 | int i, ret = 0; | |
522 | ||
523 | for (i = 0; i < num; i++) { | |
524 | ret = platform_device_register(devs[i]); | |
525 | if (ret) { | |
526 | while (--i >= 0) | |
527 | platform_device_unregister(devs[i]); | |
528 | break; | |
529 | } | |
530 | } | |
531 | ||
532 | return ret; | |
533 | } | |
a96b2042 | 534 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 535 | |
37c12e74 RK |
536 | struct platform_object { |
537 | struct platform_device pdev; | |
1cec24c5 | 538 | char name[]; |
37c12e74 RK |
539 | }; |
540 | ||
cdfee562 CH |
541 | /* |
542 | * Set up default DMA mask for platform devices if the they weren't | |
543 | * previously set by the architecture / DT. | |
544 | */ | |
545 | static void setup_pdev_dma_masks(struct platform_device *pdev) | |
546 | { | |
9495b7e9 UH |
547 | pdev->dev.dma_parms = &pdev->dma_parms; |
548 | ||
cdfee562 CH |
549 | if (!pdev->dev.coherent_dma_mask) |
550 | pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); | |
e3a36eb6 CH |
551 | if (!pdev->dev.dma_mask) { |
552 | pdev->platform_dma_mask = DMA_BIT_MASK(32); | |
553 | pdev->dev.dma_mask = &pdev->platform_dma_mask; | |
554 | } | |
cdfee562 CH |
555 | }; |
556 | ||
1da177e4 | 557 | /** |
3c31f07a | 558 | * platform_device_put - destroy a platform device |
4a3ad20c | 559 | * @pdev: platform device to free |
37c12e74 | 560 | * |
4a3ad20c GKH |
561 | * Free all memory associated with a platform device. This function must |
562 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
563 | */ |
564 | void platform_device_put(struct platform_device *pdev) | |
565 | { | |
99fef587 | 566 | if (!IS_ERR_OR_NULL(pdev)) |
37c12e74 RK |
567 | put_device(&pdev->dev); |
568 | } | |
569 | EXPORT_SYMBOL_GPL(platform_device_put); | |
570 | ||
571 | static void platform_device_release(struct device *dev) | |
572 | { | |
4a3ad20c GKH |
573 | struct platform_object *pa = container_of(dev, struct platform_object, |
574 | pdev.dev); | |
37c12e74 | 575 | |
7096d042 | 576 | of_device_node_put(&pa->pdev.dev); |
37c12e74 | 577 | kfree(pa->pdev.dev.platform_data); |
e710d7d5 | 578 | kfree(pa->pdev.mfd_cell); |
37c12e74 | 579 | kfree(pa->pdev.resource); |
3d713e0e | 580 | kfree(pa->pdev.driver_override); |
37c12e74 RK |
581 | kfree(pa); |
582 | } | |
583 | ||
584 | /** | |
3c31f07a | 585 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
586 | * @name: base name of the device we're adding |
587 | * @id: instance id | |
37c12e74 | 588 | * |
4a3ad20c GKH |
589 | * Create a platform device object which can have other objects attached |
590 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 591 | */ |
1359555e | 592 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
593 | { |
594 | struct platform_object *pa; | |
595 | ||
1cec24c5 | 596 | pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL); |
37c12e74 RK |
597 | if (pa) { |
598 | strcpy(pa->name, name); | |
599 | pa->pdev.name = pa->name; | |
600 | pa->pdev.id = id; | |
601 | device_initialize(&pa->pdev.dev); | |
602 | pa->pdev.dev.release = platform_device_release; | |
cdfee562 | 603 | setup_pdev_dma_masks(&pa->pdev); |
37c12e74 RK |
604 | } |
605 | ||
93ce3061 | 606 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
607 | } |
608 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
609 | ||
610 | /** | |
3c31f07a | 611 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
612 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
613 | * @res: set of resources that needs to be allocated for the device | |
614 | * @num: number of resources | |
37c12e74 | 615 | * |
4a3ad20c GKH |
616 | * Add a copy of the resources to the platform device. The memory |
617 | * associated with the resources will be freed when the platform device is | |
618 | * released. | |
37c12e74 | 619 | */ |
4a3ad20c | 620 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 621 | const struct resource *res, unsigned int num) |
37c12e74 | 622 | { |
cea89623 | 623 | struct resource *r = NULL; |
37c12e74 | 624 | |
cea89623 UKK |
625 | if (res) { |
626 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); | |
627 | if (!r) | |
628 | return -ENOMEM; | |
37c12e74 | 629 | } |
cea89623 | 630 | |
4a03d6f7 | 631 | kfree(pdev->resource); |
cea89623 UKK |
632 | pdev->resource = r; |
633 | pdev->num_resources = num; | |
634 | return 0; | |
37c12e74 RK |
635 | } |
636 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
637 | ||
638 | /** | |
3c31f07a | 639 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
640 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
641 | * @data: platform specific data for this platform device | |
642 | * @size: size of platform specific data | |
37c12e74 | 643 | * |
4a3ad20c GKH |
644 | * Add a copy of platform specific data to the platform device's |
645 | * platform_data pointer. The memory associated with the platform data | |
646 | * will be freed when the platform device is released. | |
37c12e74 | 647 | */ |
4a3ad20c GKH |
648 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
649 | size_t size) | |
37c12e74 | 650 | { |
27a33f9e | 651 | void *d = NULL; |
5cfc64ce | 652 | |
27a33f9e UKK |
653 | if (data) { |
654 | d = kmemdup(data, size, GFP_KERNEL); | |
655 | if (!d) | |
656 | return -ENOMEM; | |
37c12e74 | 657 | } |
27a33f9e | 658 | |
251e031d | 659 | kfree(pdev->dev.platform_data); |
27a33f9e UKK |
660 | pdev->dev.platform_data = d; |
661 | return 0; | |
37c12e74 RK |
662 | } |
663 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
664 | ||
00bbc1d8 MW |
665 | /** |
666 | * platform_device_add_properties - add built-in properties to a platform device | |
667 | * @pdev: platform device to add properties to | |
f4d05266 | 668 | * @properties: null terminated array of properties to add |
00bbc1d8 | 669 | * |
f4d05266 HK |
670 | * The function will take deep copy of @properties and attach the copy to the |
671 | * platform device. The memory associated with properties will be freed when the | |
672 | * platform device is released. | |
00bbc1d8 MW |
673 | */ |
674 | int platform_device_add_properties(struct platform_device *pdev, | |
277036f0 | 675 | const struct property_entry *properties) |
00bbc1d8 | 676 | { |
f4d05266 | 677 | return device_add_properties(&pdev->dev, properties); |
00bbc1d8 MW |
678 | } |
679 | EXPORT_SYMBOL_GPL(platform_device_add_properties); | |
680 | ||
37c12e74 | 681 | /** |
4a3ad20c GKH |
682 | * platform_device_add - add a platform device to device hierarchy |
683 | * @pdev: platform device we're adding | |
1da177e4 | 684 | * |
4a3ad20c GKH |
685 | * This is part 2 of platform_device_register(), though may be called |
686 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 687 | */ |
37c12e74 | 688 | int platform_device_add(struct platform_device *pdev) |
1da177e4 | 689 | { |
39cc539f SS |
690 | u32 i; |
691 | int ret; | |
1da177e4 LT |
692 | |
693 | if (!pdev) | |
694 | return -EINVAL; | |
695 | ||
696 | if (!pdev->dev.parent) | |
697 | pdev->dev.parent = &platform_bus; | |
698 | ||
699 | pdev->dev.bus = &platform_bus_type; | |
700 | ||
689ae231 JD |
701 | switch (pdev->id) { |
702 | default: | |
1e0b2cf9 | 703 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
689ae231 JD |
704 | break; |
705 | case PLATFORM_DEVID_NONE: | |
acc0e90f | 706 | dev_set_name(&pdev->dev, "%s", pdev->name); |
689ae231 JD |
707 | break; |
708 | case PLATFORM_DEVID_AUTO: | |
709 | /* | |
710 | * Automatically allocated device ID. We mark it as such so | |
711 | * that we remember it must be freed, and we append a suffix | |
712 | * to avoid namespace collision with explicit IDs. | |
713 | */ | |
0de75116 | 714 | ret = ida_alloc(&platform_devid_ida, GFP_KERNEL); |
689ae231 | 715 | if (ret < 0) |
5da7f709 | 716 | goto err_out; |
689ae231 JD |
717 | pdev->id = ret; |
718 | pdev->id_auto = true; | |
719 | dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); | |
720 | break; | |
721 | } | |
1da177e4 LT |
722 | |
723 | for (i = 0; i < pdev->num_resources; i++) { | |
5da7f709 | 724 | struct resource *p, *r = &pdev->resource[i]; |
1da177e4 LT |
725 | |
726 | if (r->name == NULL) | |
1e0b2cf9 | 727 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
728 | |
729 | p = r->parent; | |
730 | if (!p) { | |
0e6c861f | 731 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 732 | p = &iomem_resource; |
0e6c861f | 733 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
734 | p = &ioport_resource; |
735 | } | |
736 | ||
25ebcb7d AS |
737 | if (p) { |
738 | ret = insert_resource(p, r); | |
739 | if (ret) { | |
740 | dev_err(&pdev->dev, "failed to claim resource %d: %pR\n", i, r); | |
741 | goto failed; | |
742 | } | |
5da7f709 | 743 | } |
1da177e4 LT |
744 | } |
745 | ||
746 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 747 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 748 | |
e3915532 | 749 | ret = device_add(&pdev->dev); |
8b2dceba GKH |
750 | if (ret == 0) |
751 | return ret; | |
752 | ||
5da7f709 | 753 | failed: |
8b2dceba | 754 | if (pdev->id_auto) { |
0de75116 | 755 | ida_free(&platform_devid_ida, pdev->id); |
8b2dceba GKH |
756 | pdev->id = PLATFORM_DEVID_AUTO; |
757 | } | |
758 | ||
0707cfa5 | 759 | while (i--) { |
8b2dceba | 760 | struct resource *r = &pdev->resource[i]; |
7f5dcaf1 | 761 | if (r->parent) |
8b2dceba GKH |
762 | release_resource(r); |
763 | } | |
c9f66169 | 764 | |
5da7f709 | 765 | err_out: |
1da177e4 LT |
766 | return ret; |
767 | } | |
37c12e74 RK |
768 | EXPORT_SYMBOL_GPL(platform_device_add); |
769 | ||
770 | /** | |
4a3ad20c GKH |
771 | * platform_device_del - remove a platform-level device |
772 | * @pdev: platform device we're removing | |
1da177e4 | 773 | * |
4a3ad20c GKH |
774 | * Note that this function will also release all memory- and port-based |
775 | * resources owned by the device (@dev->resource). This function must | |
776 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 777 | */ |
93ce3061 | 778 | void platform_device_del(struct platform_device *pdev) |
1da177e4 | 779 | { |
39cc539f | 780 | u32 i; |
c9f66169 | 781 | |
99fef587 | 782 | if (!IS_ERR_OR_NULL(pdev)) { |
8b2dceba GKH |
783 | device_del(&pdev->dev); |
784 | ||
785 | if (pdev->id_auto) { | |
0de75116 | 786 | ida_free(&platform_devid_ida, pdev->id); |
8b2dceba GKH |
787 | pdev->id = PLATFORM_DEVID_AUTO; |
788 | } | |
789 | ||
790 | for (i = 0; i < pdev->num_resources; i++) { | |
791 | struct resource *r = &pdev->resource[i]; | |
7f5dcaf1 | 792 | if (r->parent) |
8b2dceba GKH |
793 | release_resource(r); |
794 | } | |
795 | } | |
1da177e4 | 796 | } |
93ce3061 DT |
797 | EXPORT_SYMBOL_GPL(platform_device_del); |
798 | ||
799 | /** | |
4a3ad20c GKH |
800 | * platform_device_register - add a platform-level device |
801 | * @pdev: platform device we're adding | |
93ce3061 | 802 | */ |
4a3ad20c | 803 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
804 | { |
805 | device_initialize(&pdev->dev); | |
cdfee562 | 806 | setup_pdev_dma_masks(pdev); |
93ce3061 DT |
807 | return platform_device_add(pdev); |
808 | } | |
a96b2042 | 809 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
810 | |
811 | /** | |
4a3ad20c GKH |
812 | * platform_device_unregister - unregister a platform-level device |
813 | * @pdev: platform device we're unregistering | |
93ce3061 | 814 | * |
4a3ad20c GKH |
815 | * Unregistration is done in 2 steps. First we release all resources |
816 | * and remove it from the subsystem, then we drop reference count by | |
817 | * calling platform_device_put(). | |
93ce3061 | 818 | */ |
4a3ad20c | 819 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
820 | { |
821 | platform_device_del(pdev); | |
822 | platform_device_put(pdev); | |
823 | } | |
a96b2042 | 824 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 825 | |
1da177e4 | 826 | /** |
01dcc60a | 827 | * platform_device_register_full - add a platform-level device with |
44f28bde | 828 | * resources and platform-specific data |
49a4ec18 | 829 | * |
01dcc60a | 830 | * @pdevinfo: data used to create device |
d8bf2540 | 831 | * |
f0eae0ed | 832 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 833 | */ |
01dcc60a | 834 | struct platform_device *platform_device_register_full( |
5a3072be | 835 | const struct platform_device_info *pdevinfo) |
d8bf2540 | 836 | { |
45bb08de | 837 | int ret; |
d8bf2540 | 838 | struct platform_device *pdev; |
d8bf2540 | 839 | |
01dcc60a | 840 | pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
44f28bde | 841 | if (!pdev) |
36cf3b13 | 842 | return ERR_PTR(-ENOMEM); |
01dcc60a UKK |
843 | |
844 | pdev->dev.parent = pdevinfo->parent; | |
ce793486 | 845 | pdev->dev.fwnode = pdevinfo->fwnode; |
2c1ea6ab MR |
846 | pdev->dev.of_node = of_node_get(to_of_node(pdev->dev.fwnode)); |
847 | pdev->dev.of_node_reused = pdevinfo->of_node_reused; | |
01dcc60a UKK |
848 | |
849 | if (pdevinfo->dma_mask) { | |
e3a36eb6 CH |
850 | pdev->platform_dma_mask = pdevinfo->dma_mask; |
851 | pdev->dev.dma_mask = &pdev->platform_dma_mask; | |
01dcc60a UKK |
852 | pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; |
853 | } | |
d8bf2540 | 854 | |
01dcc60a UKK |
855 | ret = platform_device_add_resources(pdev, |
856 | pdevinfo->res, pdevinfo->num_res); | |
807508c8 AV |
857 | if (ret) |
858 | goto err; | |
44f28bde | 859 | |
01dcc60a UKK |
860 | ret = platform_device_add_data(pdev, |
861 | pdevinfo->data, pdevinfo->size_data); | |
807508c8 AV |
862 | if (ret) |
863 | goto err; | |
d8bf2540 | 864 | |
f4d05266 HK |
865 | if (pdevinfo->properties) { |
866 | ret = platform_device_add_properties(pdev, | |
867 | pdevinfo->properties); | |
00bbc1d8 MW |
868 | if (ret) |
869 | goto err; | |
870 | } | |
871 | ||
44f28bde UKK |
872 | ret = platform_device_add(pdev); |
873 | if (ret) { | |
874 | err: | |
7b199811 | 875 | ACPI_COMPANION_SET(&pdev->dev, NULL); |
44f28bde UKK |
876 | platform_device_put(pdev); |
877 | return ERR_PTR(ret); | |
878 | } | |
d8bf2540 DB |
879 | |
880 | return pdev; | |
d8bf2540 | 881 | } |
01dcc60a | 882 | EXPORT_SYMBOL_GPL(platform_device_register_full); |
d8bf2540 | 883 | |
00d3dcdd | 884 | /** |
9447057e | 885 | * __platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 886 | * @drv: platform driver structure |
08801f96 | 887 | * @owner: owning module/driver |
00d3dcdd | 888 | */ |
9447057e LC |
889 | int __platform_driver_register(struct platform_driver *drv, |
890 | struct module *owner) | |
00d3dcdd | 891 | { |
9447057e | 892 | drv->driver.owner = owner; |
00d3dcdd | 893 | drv->driver.bus = &platform_bus_type; |
783ea7d4 | 894 | |
00d3dcdd RK |
895 | return driver_register(&drv->driver); |
896 | } | |
9447057e | 897 | EXPORT_SYMBOL_GPL(__platform_driver_register); |
00d3dcdd RK |
898 | |
899 | /** | |
3c31f07a | 900 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 901 | * @drv: platform driver structure |
00d3dcdd RK |
902 | */ |
903 | void platform_driver_unregister(struct platform_driver *drv) | |
904 | { | |
905 | driver_unregister(&drv->driver); | |
906 | } | |
907 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
908 | ||
16085668 | 909 | static int platform_probe_fail(struct platform_device *pdev) |
e21d740a UKK |
910 | { |
911 | return -ENXIO; | |
912 | } | |
913 | ||
c67334fb | 914 | /** |
c3b50dc2 | 915 | * __platform_driver_probe - register driver for non-hotpluggable device |
c67334fb | 916 | * @drv: platform driver structure |
3f9120b0 | 917 | * @probe: the driver probe routine, probably from an __init section |
c3b50dc2 | 918 | * @module: module which will be the owner of the driver |
c67334fb DB |
919 | * |
920 | * Use this instead of platform_driver_register() when you know the device | |
921 | * is not hotpluggable and has already been registered, and you want to | |
922 | * remove its run-once probe() infrastructure from memory after the driver | |
923 | * has bound to the device. | |
924 | * | |
925 | * One typical use for this would be with drivers for controllers integrated | |
926 | * into system-on-chip processors, where the controller devices have been | |
927 | * configured as part of board setup. | |
928 | * | |
3f9120b0 | 929 | * Note that this is incompatible with deferred probing. |
647c86d0 | 930 | * |
c67334fb DB |
931 | * Returns zero if the driver registered and bound to a device, else returns |
932 | * a negative error code and with the driver not registered. | |
933 | */ | |
c3b50dc2 WS |
934 | int __init_or_module __platform_driver_probe(struct platform_driver *drv, |
935 | int (*probe)(struct platform_device *), struct module *module) | |
c67334fb DB |
936 | { |
937 | int retval, code; | |
938 | ||
5c36eb2a DT |
939 | if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) { |
940 | pr_err("%s: drivers registered with %s can not be probed asynchronously\n", | |
941 | drv->driver.name, __func__); | |
942 | return -EINVAL; | |
943 | } | |
944 | ||
945 | /* | |
946 | * We have to run our probes synchronously because we check if | |
947 | * we find any devices to bind to and exit with error if there | |
948 | * are any. | |
949 | */ | |
950 | drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS; | |
951 | ||
3f9120b0 JH |
952 | /* |
953 | * Prevent driver from requesting probe deferral to avoid further | |
954 | * futile probe attempts. | |
955 | */ | |
956 | drv->prevent_deferred_probe = true; | |
957 | ||
1a6f2a75 DT |
958 | /* make sure driver won't have bind/unbind attributes */ |
959 | drv->driver.suppress_bind_attrs = true; | |
960 | ||
c67334fb DB |
961 | /* temporary section violation during probe() */ |
962 | drv->probe = probe; | |
c3b50dc2 | 963 | retval = code = __platform_driver_register(drv, module); |
388bcc6e KS |
964 | if (retval) |
965 | return retval; | |
c67334fb | 966 | |
1a6f2a75 DT |
967 | /* |
968 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
969 | * the list of drivers in order to probe new devices. Check to see |
970 | * if the probe was successful, and make sure any forced probes of | |
971 | * new devices fail. | |
972 | */ | |
d79d3244 | 973 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
16085668 | 974 | drv->probe = platform_probe_fail; |
e5dd1278 | 975 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb | 976 | retval = -ENODEV; |
d79d3244 | 977 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
978 | |
979 | if (code != retval) | |
980 | platform_driver_unregister(drv); | |
981 | return retval; | |
982 | } | |
c3b50dc2 | 983 | EXPORT_SYMBOL_GPL(__platform_driver_probe); |
1da177e4 | 984 | |
ecdf6ceb | 985 | /** |
291f653a | 986 | * __platform_create_bundle - register driver and create corresponding device |
ecdf6ceb DT |
987 | * @driver: platform driver structure |
988 | * @probe: the driver probe routine, probably from an __init section | |
989 | * @res: set of resources that needs to be allocated for the device | |
990 | * @n_res: number of resources | |
991 | * @data: platform specific data for this platform device | |
992 | * @size: size of platform specific data | |
291f653a | 993 | * @module: module which will be the owner of the driver |
ecdf6ceb DT |
994 | * |
995 | * Use this in legacy-style modules that probe hardware directly and | |
996 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
997 | * |
998 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb | 999 | */ |
291f653a | 1000 | struct platform_device * __init_or_module __platform_create_bundle( |
ecdf6ceb DT |
1001 | struct platform_driver *driver, |
1002 | int (*probe)(struct platform_device *), | |
1003 | struct resource *res, unsigned int n_res, | |
291f653a | 1004 | const void *data, size_t size, struct module *module) |
ecdf6ceb DT |
1005 | { |
1006 | struct platform_device *pdev; | |
1007 | int error; | |
1008 | ||
1009 | pdev = platform_device_alloc(driver->driver.name, -1); | |
1010 | if (!pdev) { | |
1011 | error = -ENOMEM; | |
1012 | goto err_out; | |
1013 | } | |
1014 | ||
807508c8 AV |
1015 | error = platform_device_add_resources(pdev, res, n_res); |
1016 | if (error) | |
1017 | goto err_pdev_put; | |
ecdf6ceb | 1018 | |
807508c8 AV |
1019 | error = platform_device_add_data(pdev, data, size); |
1020 | if (error) | |
1021 | goto err_pdev_put; | |
ecdf6ceb DT |
1022 | |
1023 | error = platform_device_add(pdev); | |
1024 | if (error) | |
1025 | goto err_pdev_put; | |
1026 | ||
291f653a | 1027 | error = __platform_driver_probe(driver, probe, module); |
ecdf6ceb DT |
1028 | if (error) |
1029 | goto err_pdev_del; | |
1030 | ||
1031 | return pdev; | |
1032 | ||
1033 | err_pdev_del: | |
1034 | platform_device_del(pdev); | |
1035 | err_pdev_put: | |
1036 | platform_device_put(pdev); | |
1037 | err_out: | |
1038 | return ERR_PTR(error); | |
1039 | } | |
291f653a | 1040 | EXPORT_SYMBOL_GPL(__platform_create_bundle); |
ecdf6ceb | 1041 | |
dbe2256d TR |
1042 | /** |
1043 | * __platform_register_drivers - register an array of platform drivers | |
1044 | * @drivers: an array of drivers to register | |
1045 | * @count: the number of drivers to register | |
1046 | * @owner: module owning the drivers | |
1047 | * | |
1048 | * Registers platform drivers specified by an array. On failure to register a | |
1049 | * driver, all previously registered drivers will be unregistered. Callers of | |
1050 | * this API should use platform_unregister_drivers() to unregister drivers in | |
1051 | * the reverse order. | |
1052 | * | |
1053 | * Returns: 0 on success or a negative error code on failure. | |
1054 | */ | |
1055 | int __platform_register_drivers(struct platform_driver * const *drivers, | |
1056 | unsigned int count, struct module *owner) | |
1057 | { | |
1058 | unsigned int i; | |
1059 | int err; | |
1060 | ||
1061 | for (i = 0; i < count; i++) { | |
1062 | pr_debug("registering platform driver %ps\n", drivers[i]); | |
1063 | ||
1064 | err = __platform_driver_register(drivers[i], owner); | |
1065 | if (err < 0) { | |
1066 | pr_err("failed to register platform driver %ps: %d\n", | |
1067 | drivers[i], err); | |
1068 | goto error; | |
1069 | } | |
1070 | } | |
1071 | ||
1072 | return 0; | |
1073 | ||
1074 | error: | |
1075 | while (i--) { | |
1076 | pr_debug("unregistering platform driver %ps\n", drivers[i]); | |
1077 | platform_driver_unregister(drivers[i]); | |
1078 | } | |
1079 | ||
1080 | return err; | |
1081 | } | |
1082 | EXPORT_SYMBOL_GPL(__platform_register_drivers); | |
1083 | ||
1084 | /** | |
1085 | * platform_unregister_drivers - unregister an array of platform drivers | |
1086 | * @drivers: an array of drivers to unregister | |
1087 | * @count: the number of drivers to unregister | |
1088 | * | |
c82c83c3 | 1089 | * Unregisters platform drivers specified by an array. This is typically used |
dbe2256d TR |
1090 | * to complement an earlier call to platform_register_drivers(). Drivers are |
1091 | * unregistered in the reverse order in which they were registered. | |
1092 | */ | |
1093 | void platform_unregister_drivers(struct platform_driver * const *drivers, | |
1094 | unsigned int count) | |
1095 | { | |
1096 | while (count--) { | |
1097 | pr_debug("unregistering platform driver %ps\n", drivers[count]); | |
1098 | platform_driver_unregister(drivers[count]); | |
1099 | } | |
1100 | } | |
1101 | EXPORT_SYMBOL_GPL(platform_unregister_drivers); | |
1102 | ||
57fee4a5 | 1103 | static const struct platform_device_id *platform_match_id( |
831fad2f | 1104 | const struct platform_device_id *id, |
57fee4a5 EM |
1105 | struct platform_device *pdev) |
1106 | { | |
1107 | while (id->name[0]) { | |
391c0325 | 1108 | if (strcmp(pdev->name, id->name) == 0) { |
57fee4a5 EM |
1109 | pdev->id_entry = id; |
1110 | return id; | |
1111 | } | |
1112 | id++; | |
1113 | } | |
1114 | return NULL; | |
1115 | } | |
1116 | ||
25e18499 RW |
1117 | #ifdef CONFIG_PM_SLEEP |
1118 | ||
1119 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 1120 | { |
783ea7d4 MD |
1121 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
1122 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
1123 | int ret = 0; |
1124 | ||
783ea7d4 MD |
1125 | if (dev->driver && pdrv->suspend) |
1126 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
1127 | |
1128 | return ret; | |
1129 | } | |
1130 | ||
25e18499 | 1131 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 1132 | { |
783ea7d4 MD |
1133 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
1134 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
1135 | int ret = 0; |
1136 | ||
783ea7d4 MD |
1137 | if (dev->driver && pdrv->resume) |
1138 | ret = pdrv->resume(pdev); | |
9480e307 | 1139 | |
1da177e4 LT |
1140 | return ret; |
1141 | } | |
1142 | ||
69c9dd1e | 1143 | #endif /* CONFIG_PM_SLEEP */ |
9d730229 | 1144 | |
25e18499 RW |
1145 | #ifdef CONFIG_SUSPEND |
1146 | ||
69c9dd1e | 1147 | int platform_pm_suspend(struct device *dev) |
25e18499 RW |
1148 | { |
1149 | struct device_driver *drv = dev->driver; | |
1150 | int ret = 0; | |
1151 | ||
adf09493 RW |
1152 | if (!drv) |
1153 | return 0; | |
1154 | ||
1155 | if (drv->pm) { | |
25e18499 RW |
1156 | if (drv->pm->suspend) |
1157 | ret = drv->pm->suspend(dev); | |
1158 | } else { | |
1159 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
1160 | } | |
1161 | ||
1162 | return ret; | |
1163 | } | |
1164 | ||
69c9dd1e | 1165 | int platform_pm_resume(struct device *dev) |
25e18499 RW |
1166 | { |
1167 | struct device_driver *drv = dev->driver; | |
1168 | int ret = 0; | |
1169 | ||
adf09493 RW |
1170 | if (!drv) |
1171 | return 0; | |
1172 | ||
1173 | if (drv->pm) { | |
25e18499 RW |
1174 | if (drv->pm->resume) |
1175 | ret = drv->pm->resume(dev); | |
1176 | } else { | |
1177 | ret = platform_legacy_resume(dev); | |
1178 | } | |
1179 | ||
1180 | return ret; | |
1181 | } | |
1182 | ||
69c9dd1e | 1183 | #endif /* CONFIG_SUSPEND */ |
25e18499 | 1184 | |
1f112cee | 1185 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 | 1186 | |
69c9dd1e | 1187 | int platform_pm_freeze(struct device *dev) |
25e18499 RW |
1188 | { |
1189 | struct device_driver *drv = dev->driver; | |
1190 | int ret = 0; | |
1191 | ||
1192 | if (!drv) | |
1193 | return 0; | |
1194 | ||
1195 | if (drv->pm) { | |
1196 | if (drv->pm->freeze) | |
1197 | ret = drv->pm->freeze(dev); | |
1198 | } else { | |
1199 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
1200 | } | |
1201 | ||
1202 | return ret; | |
1203 | } | |
1204 | ||
69c9dd1e | 1205 | int platform_pm_thaw(struct device *dev) |
25e18499 RW |
1206 | { |
1207 | struct device_driver *drv = dev->driver; | |
1208 | int ret = 0; | |
1209 | ||
adf09493 RW |
1210 | if (!drv) |
1211 | return 0; | |
1212 | ||
1213 | if (drv->pm) { | |
25e18499 RW |
1214 | if (drv->pm->thaw) |
1215 | ret = drv->pm->thaw(dev); | |
1216 | } else { | |
1217 | ret = platform_legacy_resume(dev); | |
1218 | } | |
1219 | ||
1220 | return ret; | |
1221 | } | |
1222 | ||
69c9dd1e | 1223 | int platform_pm_poweroff(struct device *dev) |
25e18499 RW |
1224 | { |
1225 | struct device_driver *drv = dev->driver; | |
1226 | int ret = 0; | |
1227 | ||
adf09493 RW |
1228 | if (!drv) |
1229 | return 0; | |
1230 | ||
1231 | if (drv->pm) { | |
25e18499 RW |
1232 | if (drv->pm->poweroff) |
1233 | ret = drv->pm->poweroff(dev); | |
1234 | } else { | |
1235 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
1236 | } | |
1237 | ||
1238 | return ret; | |
1239 | } | |
1240 | ||
69c9dd1e | 1241 | int platform_pm_restore(struct device *dev) |
25e18499 RW |
1242 | { |
1243 | struct device_driver *drv = dev->driver; | |
1244 | int ret = 0; | |
1245 | ||
adf09493 RW |
1246 | if (!drv) |
1247 | return 0; | |
1248 | ||
1249 | if (drv->pm) { | |
25e18499 RW |
1250 | if (drv->pm->restore) |
1251 | ret = drv->pm->restore(dev); | |
1252 | } else { | |
1253 | ret = platform_legacy_resume(dev); | |
1254 | } | |
1255 | ||
1256 | return ret; | |
1257 | } | |
1258 | ||
69c9dd1e | 1259 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 1260 | |
e21d740a UKK |
1261 | /* modalias support enables more hands-off userspace setup: |
1262 | * (a) environment variable lets new-style hotplug events work once system is | |
1263 | * fully running: "modprobe $MODALIAS" | |
1264 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
1265 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
1266 | */ | |
1267 | static ssize_t modalias_show(struct device *dev, | |
1268 | struct device_attribute *attr, char *buf) | |
1269 | { | |
1270 | struct platform_device *pdev = to_platform_device(dev); | |
1271 | int len; | |
1272 | ||
1273 | len = of_device_modalias(dev, buf, PAGE_SIZE); | |
1274 | if (len != -ENODEV) | |
1275 | return len; | |
1276 | ||
1277 | len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1); | |
1278 | if (len != -ENODEV) | |
1279 | return len; | |
1280 | ||
1281 | return sysfs_emit(buf, "platform:%s\n", pdev->name); | |
1282 | } | |
1283 | static DEVICE_ATTR_RO(modalias); | |
1284 | ||
1285 | static ssize_t numa_node_show(struct device *dev, | |
1286 | struct device_attribute *attr, char *buf) | |
1287 | { | |
1288 | return sysfs_emit(buf, "%d\n", dev_to_node(dev)); | |
1289 | } | |
1290 | static DEVICE_ATTR_RO(numa_node); | |
1291 | ||
1292 | static ssize_t driver_override_show(struct device *dev, | |
1293 | struct device_attribute *attr, char *buf) | |
1294 | { | |
1295 | struct platform_device *pdev = to_platform_device(dev); | |
1296 | ssize_t len; | |
1297 | ||
1298 | device_lock(dev); | |
1299 | len = sysfs_emit(buf, "%s\n", pdev->driver_override); | |
1300 | device_unlock(dev); | |
1301 | ||
1302 | return len; | |
1303 | } | |
1304 | ||
1305 | static ssize_t driver_override_store(struct device *dev, | |
1306 | struct device_attribute *attr, | |
1307 | const char *buf, size_t count) | |
1308 | { | |
1309 | struct platform_device *pdev = to_platform_device(dev); | |
1310 | char *driver_override, *old, *cp; | |
1311 | ||
1312 | /* We need to keep extra room for a newline */ | |
1313 | if (count >= (PAGE_SIZE - 1)) | |
1314 | return -EINVAL; | |
1315 | ||
1316 | driver_override = kstrndup(buf, count, GFP_KERNEL); | |
1317 | if (!driver_override) | |
1318 | return -ENOMEM; | |
1319 | ||
1320 | cp = strchr(driver_override, '\n'); | |
1321 | if (cp) | |
1322 | *cp = '\0'; | |
1323 | ||
1324 | device_lock(dev); | |
1325 | old = pdev->driver_override; | |
1326 | if (strlen(driver_override)) { | |
1327 | pdev->driver_override = driver_override; | |
1328 | } else { | |
1329 | kfree(driver_override); | |
1330 | pdev->driver_override = NULL; | |
1331 | } | |
1332 | device_unlock(dev); | |
1333 | ||
1334 | kfree(old); | |
1335 | ||
1336 | return count; | |
1337 | } | |
1338 | static DEVICE_ATTR_RW(driver_override); | |
1339 | ||
1340 | static struct attribute *platform_dev_attrs[] = { | |
1341 | &dev_attr_modalias.attr, | |
1342 | &dev_attr_numa_node.attr, | |
1343 | &dev_attr_driver_override.attr, | |
1344 | NULL, | |
1345 | }; | |
1346 | ||
1347 | static umode_t platform_dev_attrs_visible(struct kobject *kobj, struct attribute *a, | |
1348 | int n) | |
1349 | { | |
1350 | struct device *dev = container_of(kobj, typeof(*dev), kobj); | |
1351 | ||
1352 | if (a == &dev_attr_numa_node.attr && | |
1353 | dev_to_node(dev) == NUMA_NO_NODE) | |
1354 | return 0; | |
1355 | ||
1356 | return a->mode; | |
1357 | } | |
1358 | ||
1359 | static struct attribute_group platform_dev_group = { | |
1360 | .attrs = platform_dev_attrs, | |
1361 | .is_visible = platform_dev_attrs_visible, | |
1362 | }; | |
1363 | __ATTRIBUTE_GROUPS(platform_dev); | |
1364 | ||
1365 | ||
1366 | /** | |
1367 | * platform_match - bind platform device to platform driver. | |
1368 | * @dev: device. | |
1369 | * @drv: driver. | |
1370 | * | |
1371 | * Platform device IDs are assumed to be encoded like this: | |
1372 | * "<name><instance>", where <name> is a short description of the type of | |
1373 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
1374 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
1375 | * "<name>". So, extract the <name> from the platform_device structure, | |
1376 | * and compare it against the name of the driver. Return whether they match | |
1377 | * or not. | |
1378 | */ | |
1379 | static int platform_match(struct device *dev, struct device_driver *drv) | |
1380 | { | |
1381 | struct platform_device *pdev = to_platform_device(dev); | |
1382 | struct platform_driver *pdrv = to_platform_driver(drv); | |
1383 | ||
1384 | /* When driver_override is set, only bind to the matching driver */ | |
1385 | if (pdev->driver_override) | |
1386 | return !strcmp(pdev->driver_override, drv->name); | |
1387 | ||
1388 | /* Attempt an OF style match first */ | |
1389 | if (of_driver_match_device(dev, drv)) | |
1390 | return 1; | |
1391 | ||
1392 | /* Then try ACPI style match */ | |
1393 | if (acpi_driver_match_device(dev, drv)) | |
1394 | return 1; | |
1395 | ||
1396 | /* Then try to match against the id table */ | |
1397 | if (pdrv->id_table) | |
1398 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1399 | ||
1400 | /* fall-back to driver name match */ | |
1401 | return (strcmp(pdev->name, drv->name) == 0); | |
1402 | } | |
1403 | ||
1404 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) | |
1405 | { | |
1406 | struct platform_device *pdev = to_platform_device(dev); | |
1407 | int rc; | |
1408 | ||
1409 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
1410 | rc = of_device_uevent_modalias(dev, env); | |
1411 | if (rc != -ENODEV) | |
1412 | return rc; | |
1413 | ||
1414 | rc = acpi_device_uevent_modalias(dev, env); | |
1415 | if (rc != -ENODEV) | |
1416 | return rc; | |
1417 | ||
1418 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, | |
1419 | pdev->name); | |
1420 | return 0; | |
1421 | } | |
1422 | ||
9c30921f UKK |
1423 | static int platform_probe(struct device *_dev) |
1424 | { | |
1425 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
1426 | struct platform_device *dev = to_platform_device(_dev); | |
1427 | int ret; | |
1428 | ||
1429 | /* | |
1430 | * A driver registered using platform_driver_probe() cannot be bound | |
1431 | * again later because the probe function usually lives in __init code | |
1432 | * and so is gone. For these drivers .probe is set to | |
1433 | * platform_probe_fail in __platform_driver_probe(). Don't even prepare | |
1434 | * clocks and PM domains for these to match the traditional behaviour. | |
1435 | */ | |
1436 | if (unlikely(drv->probe == platform_probe_fail)) | |
1437 | return -ENXIO; | |
1438 | ||
1439 | ret = of_clk_set_defaults(_dev->of_node, false); | |
1440 | if (ret < 0) | |
1441 | return ret; | |
1442 | ||
1443 | ret = dev_pm_domain_attach(_dev, true); | |
1444 | if (ret) | |
1445 | goto out; | |
1446 | ||
1447 | if (drv->probe) { | |
1448 | ret = drv->probe(dev); | |
1449 | if (ret) | |
1450 | dev_pm_domain_detach(_dev, true); | |
1451 | } | |
1452 | ||
1453 | out: | |
1454 | if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) { | |
1455 | dev_warn(_dev, "probe deferral not supported\n"); | |
1456 | ret = -ENXIO; | |
1457 | } | |
1458 | ||
1459 | return ret; | |
1460 | } | |
1461 | ||
1462 | static int platform_remove(struct device *_dev) | |
1463 | { | |
1464 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
1465 | struct platform_device *dev = to_platform_device(_dev); | |
1466 | int ret = 0; | |
1467 | ||
1468 | if (drv->remove) | |
1469 | ret = drv->remove(dev); | |
1470 | dev_pm_domain_detach(_dev, true); | |
1471 | ||
1472 | return ret; | |
1473 | } | |
1474 | ||
1475 | static void platform_shutdown(struct device *_dev) | |
1476 | { | |
9c30921f | 1477 | struct platform_device *dev = to_platform_device(_dev); |
46e85af0 DB |
1478 | struct platform_driver *drv; |
1479 | ||
1480 | if (!_dev->driver) | |
1481 | return; | |
9c30921f | 1482 | |
46e85af0 | 1483 | drv = to_platform_driver(_dev->driver); |
9c30921f UKK |
1484 | if (drv->shutdown) |
1485 | drv->shutdown(dev); | |
1486 | } | |
1487 | ||
1488 | ||
07397df2 NG |
1489 | int platform_dma_configure(struct device *dev) |
1490 | { | |
1491 | enum dev_dma_attr attr; | |
1492 | int ret = 0; | |
1493 | ||
1494 | if (dev->of_node) { | |
3d6ce86e | 1495 | ret = of_dma_configure(dev, dev->of_node, true); |
07397df2 NG |
1496 | } else if (has_acpi_companion(dev)) { |
1497 | attr = acpi_get_dma_attr(to_acpi_device_node(dev->fwnode)); | |
e5361ca2 | 1498 | ret = acpi_dma_configure(dev, attr); |
07397df2 NG |
1499 | } |
1500 | ||
1501 | return ret; | |
1502 | } | |
1503 | ||
d9ab7716 | 1504 | static const struct dev_pm_ops platform_dev_pm_ops = { |
8b313a38 RW |
1505 | .runtime_suspend = pm_generic_runtime_suspend, |
1506 | .runtime_resume = pm_generic_runtime_resume, | |
69c9dd1e | 1507 | USE_PLATFORM_PM_SLEEP_OPS |
25e18499 RW |
1508 | }; |
1509 | ||
1da177e4 LT |
1510 | struct bus_type platform_bus_type = { |
1511 | .name = "platform", | |
d06262e5 | 1512 | .dev_groups = platform_dev_groups, |
1da177e4 | 1513 | .match = platform_match, |
a0245f7a | 1514 | .uevent = platform_uevent, |
9c30921f UKK |
1515 | .probe = platform_probe, |
1516 | .remove = platform_remove, | |
1517 | .shutdown = platform_shutdown, | |
07397df2 | 1518 | .dma_configure = platform_dma_configure, |
9d730229 | 1519 | .pm = &platform_dev_pm_ops, |
1da177e4 | 1520 | }; |
a96b2042 | 1521 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 | 1522 | |
492c8872 ST |
1523 | static inline int __platform_match(struct device *dev, const void *drv) |
1524 | { | |
1525 | return platform_match(dev, (struct device_driver *)drv); | |
1526 | } | |
1527 | ||
36f3313d SP |
1528 | /** |
1529 | * platform_find_device_by_driver - Find a platform device with a given | |
1530 | * driver. | |
1531 | * @start: The device to start the search from. | |
1532 | * @drv: The device driver to look for. | |
1533 | */ | |
1534 | struct device *platform_find_device_by_driver(struct device *start, | |
1535 | const struct device_driver *drv) | |
1536 | { | |
1537 | return bus_find_device(&platform_bus_type, start, drv, | |
492c8872 | 1538 | __platform_match); |
36f3313d SP |
1539 | } |
1540 | EXPORT_SYMBOL_GPL(platform_find_device_by_driver); | |
1541 | ||
eecd37e1 GR |
1542 | void __weak __init early_platform_cleanup(void) { } |
1543 | ||
1da177e4 LT |
1544 | int __init platform_bus_init(void) |
1545 | { | |
fbfb1445 CH |
1546 | int error; |
1547 | ||
eecd37e1 GR |
1548 | early_platform_cleanup(); |
1549 | ||
fbfb1445 | 1550 | error = device_register(&platform_bus); |
c8ae1674 AY |
1551 | if (error) { |
1552 | put_device(&platform_bus); | |
fbfb1445 | 1553 | return error; |
c8ae1674 | 1554 | } |
fbfb1445 CH |
1555 | error = bus_register(&platform_bus_type); |
1556 | if (error) | |
1557 | device_unregister(&platform_bus); | |
801d728c | 1558 | of_platform_register_reconfig_notifier(); |
fbfb1445 | 1559 | return error; |
1da177e4 | 1560 | } |