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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 | 126 | |
c9c8641d BG |
127 | /** |
128 | * devm_platform_ioremap_resource_byname - call devm_ioremap_resource for | |
129 | * a platform device, retrieve the | |
130 | * resource by name | |
131 | * | |
132 | * @pdev: platform device to use both for memory resource lookup as well as | |
133 | * resource management | |
134 | * @name: name of the resource | |
0c7a6b91 SB |
135 | * |
136 | * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code | |
137 | * on failure. | |
c9c8641d BG |
138 | */ |
139 | void __iomem * | |
140 | devm_platform_ioremap_resource_byname(struct platform_device *pdev, | |
141 | const char *name) | |
142 | { | |
143 | struct resource *res; | |
144 | ||
145 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name); | |
146 | return devm_ioremap_resource(&pdev->dev, res); | |
147 | } | |
148 | EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource_byname); | |
837ccda3 | 149 | #endif /* CONFIG_HAS_IOMEM */ |
7945f929 | 150 | |
c2f3f755 GKH |
151 | /** |
152 | * platform_get_irq_optional - get an optional IRQ for a device | |
153 | * @dev: platform device | |
154 | * @num: IRQ number index | |
155 | * | |
156 | * Gets an IRQ for a platform device. Device drivers should check the return | |
157 | * value for errors so as to not pass a negative integer value to the | |
158 | * request_irq() APIs. This is the same as platform_get_irq(), except that it | |
159 | * does not print an error message if an IRQ can not be obtained. | |
160 | * | |
161 | * For example:: | |
162 | * | |
163 | * int irq = platform_get_irq_optional(pdev, 0); | |
164 | * if (irq < 0) | |
165 | * return irq; | |
166 | * | |
167 | * Return: non-zero IRQ number on success, negative error number on failure. | |
168 | */ | |
169 | int platform_get_irq_optional(struct platform_device *dev, unsigned int num) | |
1da177e4 | 170 | { |
a85a6c86 | 171 | int ret; |
5cf8f7db AL |
172 | #ifdef CONFIG_SPARC |
173 | /* sparc does not have irqs represented as IORESOURCE_IRQ resources */ | |
174 | if (!dev || num >= dev->archdata.num_irqs) | |
c99f4ebc | 175 | goto out_not_found; |
a85a6c86 BH |
176 | ret = dev->archdata.irqs[num]; |
177 | goto out; | |
5cf8f7db | 178 | #else |
9ec36caf | 179 | struct resource *r; |
aff008ad | 180 | |
71564a26 | 181 | if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) { |
aff008ad | 182 | ret = of_irq_get(dev->dev.of_node, num); |
e330b9a6 | 183 | if (ret > 0 || ret == -EPROBE_DEFER) |
a85a6c86 | 184 | goto out; |
aff008ad | 185 | } |
9ec36caf RH |
186 | |
187 | r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
d44fa3d4 AVF |
188 | if (has_acpi_companion(&dev->dev)) { |
189 | if (r && r->flags & IORESOURCE_DISABLED) { | |
d44fa3d4 AVF |
190 | ret = acpi_irq_get(ACPI_HANDLE(&dev->dev), num, r); |
191 | if (ret) | |
a85a6c86 | 192 | goto out; |
d44fa3d4 AVF |
193 | } |
194 | } | |
195 | ||
7085a740 LW |
196 | /* |
197 | * The resources may pass trigger flags to the irqs that need | |
198 | * to be set up. It so happens that the trigger flags for | |
199 | * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER* | |
200 | * settings. | |
201 | */ | |
60ca5e0d GR |
202 | if (r && r->flags & IORESOURCE_BITS) { |
203 | struct irq_data *irqd; | |
204 | ||
205 | irqd = irq_get_irq_data(r->start); | |
c99f4ebc AS |
206 | if (!irqd) |
207 | goto out_not_found; | |
60ca5e0d GR |
208 | irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS); |
209 | } | |
1da177e4 | 210 | |
a85a6c86 BH |
211 | if (r) { |
212 | ret = r->start; | |
213 | goto out; | |
214 | } | |
daaef255 EG |
215 | |
216 | /* | |
217 | * For the index 0 interrupt, allow falling back to GpioInt | |
218 | * resources. While a device could have both Interrupt and GpioInt | |
219 | * resources, making this fallback ambiguous, in many common cases | |
220 | * the device will only expose one IRQ, and this fallback | |
221 | * allows a common code path across either kind of resource. | |
222 | */ | |
46c42d84 | 223 | if (num == 0 && has_acpi_companion(&dev->dev)) { |
71564a26 | 224 | ret = acpi_dev_gpio_irq_get(ACPI_COMPANION(&dev->dev), num); |
46c42d84 BN |
225 | /* Our callers expect -ENXIO for missing IRQs. */ |
226 | if (ret >= 0 || ret == -EPROBE_DEFER) | |
a85a6c86 | 227 | goto out; |
46c42d84 | 228 | } |
daaef255 | 229 | |
5cf8f7db | 230 | #endif |
c99f4ebc AS |
231 | out_not_found: |
232 | ret = -ENXIO; | |
a85a6c86 BH |
233 | out: |
234 | WARN(ret == 0, "0 is an invalid IRQ number\n"); | |
235 | return ret; | |
1da177e4 | 236 | } |
ec4e2906 | 237 | EXPORT_SYMBOL_GPL(platform_get_irq_optional); |
7723f4c5 SB |
238 | |
239 | /** | |
240 | * platform_get_irq - get an IRQ for a device | |
241 | * @dev: platform device | |
242 | * @num: IRQ number index | |
243 | * | |
244 | * Gets an IRQ for a platform device and prints an error message if finding the | |
245 | * IRQ fails. Device drivers should check the return value for errors so as to | |
246 | * not pass a negative integer value to the request_irq() APIs. | |
247 | * | |
f0825246 MCC |
248 | * For example:: |
249 | * | |
7723f4c5 SB |
250 | * int irq = platform_get_irq(pdev, 0); |
251 | * if (irq < 0) | |
252 | * return irq; | |
253 | * | |
a85a6c86 | 254 | * Return: non-zero IRQ number on success, negative error number on failure. |
7723f4c5 SB |
255 | */ |
256 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
257 | { | |
258 | int ret; | |
259 | ||
c2f3f755 | 260 | ret = platform_get_irq_optional(dev, num); |
2043727c CH |
261 | if (ret < 0) |
262 | return dev_err_probe(&dev->dev, ret, | |
263 | "IRQ index %u not found\n", num); | |
7723f4c5 SB |
264 | |
265 | return ret; | |
266 | } | |
a96b2042 | 267 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 | 268 | |
4b83555d SB |
269 | /** |
270 | * platform_irq_count - Count the number of IRQs a platform device uses | |
271 | * @dev: platform device | |
272 | * | |
273 | * Return: Number of IRQs a platform device uses or EPROBE_DEFER | |
274 | */ | |
275 | int platform_irq_count(struct platform_device *dev) | |
276 | { | |
277 | int ret, nr = 0; | |
278 | ||
c2f3f755 | 279 | while ((ret = platform_get_irq_optional(dev, nr)) >= 0) |
4b83555d SB |
280 | nr++; |
281 | ||
282 | if (ret == -EPROBE_DEFER) | |
283 | return ret; | |
284 | ||
285 | return nr; | |
286 | } | |
287 | EXPORT_SYMBOL_GPL(platform_irq_count); | |
288 | ||
e15f2fa9 JG |
289 | struct irq_affinity_devres { |
290 | unsigned int count; | |
291 | unsigned int irq[]; | |
292 | }; | |
293 | ||
294 | static void platform_disable_acpi_irq(struct platform_device *pdev, int index) | |
295 | { | |
296 | struct resource *r; | |
297 | ||
298 | r = platform_get_resource(pdev, IORESOURCE_IRQ, index); | |
299 | if (r) | |
300 | irqresource_disabled(r, 0); | |
301 | } | |
302 | ||
303 | static void devm_platform_get_irqs_affinity_release(struct device *dev, | |
304 | void *res) | |
305 | { | |
306 | struct irq_affinity_devres *ptr = res; | |
307 | int i; | |
308 | ||
309 | for (i = 0; i < ptr->count; i++) { | |
310 | irq_dispose_mapping(ptr->irq[i]); | |
311 | ||
312 | if (has_acpi_companion(dev)) | |
313 | platform_disable_acpi_irq(to_platform_device(dev), i); | |
314 | } | |
315 | } | |
316 | ||
317 | /** | |
318 | * devm_platform_get_irqs_affinity - devm method to get a set of IRQs for a | |
319 | * device using an interrupt affinity descriptor | |
320 | * @dev: platform device pointer | |
321 | * @affd: affinity descriptor | |
322 | * @minvec: minimum count of interrupt vectors | |
323 | * @maxvec: maximum count of interrupt vectors | |
324 | * @irqs: pointer holder for IRQ numbers | |
325 | * | |
326 | * Gets a set of IRQs for a platform device, and updates IRQ afffinty according | |
327 | * to the passed affinity descriptor | |
328 | * | |
329 | * Return: Number of vectors on success, negative error number on failure. | |
330 | */ | |
331 | int devm_platform_get_irqs_affinity(struct platform_device *dev, | |
332 | struct irq_affinity *affd, | |
333 | unsigned int minvec, | |
334 | unsigned int maxvec, | |
335 | int **irqs) | |
336 | { | |
337 | struct irq_affinity_devres *ptr; | |
338 | struct irq_affinity_desc *desc; | |
339 | size_t size; | |
340 | int i, ret, nvec; | |
341 | ||
342 | if (!affd) | |
343 | return -EPERM; | |
344 | ||
345 | if (maxvec < minvec) | |
346 | return -ERANGE; | |
347 | ||
348 | nvec = platform_irq_count(dev); | |
e1dc2099 JG |
349 | if (nvec < 0) |
350 | return nvec; | |
e15f2fa9 JG |
351 | |
352 | if (nvec < minvec) | |
353 | return -ENOSPC; | |
354 | ||
355 | nvec = irq_calc_affinity_vectors(minvec, nvec, affd); | |
356 | if (nvec < minvec) | |
357 | return -ENOSPC; | |
358 | ||
359 | if (nvec > maxvec) | |
360 | nvec = maxvec; | |
361 | ||
362 | size = sizeof(*ptr) + sizeof(unsigned int) * nvec; | |
363 | ptr = devres_alloc(devm_platform_get_irqs_affinity_release, size, | |
364 | GFP_KERNEL); | |
365 | if (!ptr) | |
366 | return -ENOMEM; | |
367 | ||
368 | ptr->count = nvec; | |
369 | ||
370 | for (i = 0; i < nvec; i++) { | |
371 | int irq = platform_get_irq(dev, i); | |
372 | if (irq < 0) { | |
373 | ret = irq; | |
374 | goto err_free_devres; | |
375 | } | |
376 | ptr->irq[i] = irq; | |
377 | } | |
378 | ||
379 | desc = irq_create_affinity_masks(nvec, affd); | |
380 | if (!desc) { | |
381 | ret = -ENOMEM; | |
382 | goto err_free_devres; | |
383 | } | |
384 | ||
385 | for (i = 0; i < nvec; i++) { | |
386 | ret = irq_update_affinity_desc(ptr->irq[i], &desc[i]); | |
387 | if (ret) { | |
388 | dev_err(&dev->dev, "failed to update irq%d affinity descriptor (%d)\n", | |
389 | ptr->irq[i], ret); | |
390 | goto err_free_desc; | |
391 | } | |
392 | } | |
393 | ||
394 | devres_add(&dev->dev, ptr); | |
395 | ||
396 | kfree(desc); | |
397 | ||
398 | *irqs = ptr->irq; | |
399 | ||
400 | return nvec; | |
401 | ||
402 | err_free_desc: | |
403 | kfree(desc); | |
404 | err_free_devres: | |
405 | devres_free(ptr); | |
406 | return ret; | |
407 | } | |
408 | EXPORT_SYMBOL_GPL(devm_platform_get_irqs_affinity); | |
409 | ||
1da177e4 | 410 | /** |
4a3ad20c GKH |
411 | * platform_get_resource_byname - get a resource for a device by name |
412 | * @dev: platform device | |
413 | * @type: resource type | |
414 | * @name: resource name | |
1da177e4 | 415 | */ |
4a3ad20c | 416 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
417 | unsigned int type, |
418 | const char *name) | |
1da177e4 | 419 | { |
39cc539f | 420 | u32 i; |
1da177e4 LT |
421 | |
422 | for (i = 0; i < dev->num_resources; i++) { | |
423 | struct resource *r = &dev->resource[i]; | |
424 | ||
1b8cb929 PU |
425 | if (unlikely(!r->name)) |
426 | continue; | |
427 | ||
c9f66169 MD |
428 | if (type == resource_type(r) && !strcmp(r->name, name)) |
429 | return r; | |
1da177e4 LT |
430 | } |
431 | return NULL; | |
432 | } | |
a96b2042 | 433 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 | 434 | |
f1da567f HG |
435 | static int __platform_get_irq_byname(struct platform_device *dev, |
436 | const char *name) | |
1da177e4 | 437 | { |
ad69674e | 438 | struct resource *r; |
71564a26 | 439 | int ret; |
ad69674e | 440 | |
aff008ad | 441 | if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) { |
aff008ad | 442 | ret = of_irq_get_byname(dev->dev.of_node, name); |
e330b9a6 | 443 | if (ret > 0 || ret == -EPROBE_DEFER) |
aff008ad GR |
444 | return ret; |
445 | } | |
1da177e4 | 446 | |
ad69674e | 447 | r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name); |
a85a6c86 BH |
448 | if (r) { |
449 | WARN(r->start == 0, "0 is an invalid IRQ number\n"); | |
7723f4c5 | 450 | return r->start; |
a85a6c86 | 451 | } |
7723f4c5 | 452 | |
7723f4c5 | 453 | return -ENXIO; |
1da177e4 | 454 | } |
f1da567f HG |
455 | |
456 | /** | |
457 | * platform_get_irq_byname - get an IRQ for a device by name | |
458 | * @dev: platform device | |
459 | * @name: IRQ name | |
460 | * | |
461 | * Get an IRQ like platform_get_irq(), but then by name rather then by index. | |
462 | * | |
a85a6c86 | 463 | * Return: non-zero IRQ number on success, negative error number on failure. |
f1da567f HG |
464 | */ |
465 | int platform_get_irq_byname(struct platform_device *dev, const char *name) | |
466 | { | |
467 | int ret; | |
468 | ||
469 | ret = __platform_get_irq_byname(dev, name); | |
470 | if (ret < 0 && ret != -EPROBE_DEFER) | |
471 | dev_err(&dev->dev, "IRQ %s not found\n", name); | |
472 | ||
473 | return ret; | |
474 | } | |
a96b2042 | 475 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 | 476 | |
f1da567f HG |
477 | /** |
478 | * platform_get_irq_byname_optional - get an optional IRQ for a device by name | |
479 | * @dev: platform device | |
480 | * @name: IRQ name | |
481 | * | |
482 | * Get an optional IRQ by name like platform_get_irq_byname(). Except that it | |
483 | * does not print an error message if an IRQ can not be obtained. | |
484 | * | |
a85a6c86 | 485 | * Return: non-zero IRQ number on success, negative error number on failure. |
f1da567f HG |
486 | */ |
487 | int platform_get_irq_byname_optional(struct platform_device *dev, | |
488 | const char *name) | |
489 | { | |
490 | return __platform_get_irq_byname(dev, name); | |
491 | } | |
492 | EXPORT_SYMBOL_GPL(platform_get_irq_byname_optional); | |
493 | ||
1da177e4 | 494 | /** |
4a3ad20c GKH |
495 | * platform_add_devices - add a numbers of platform devices |
496 | * @devs: array of platform devices to add | |
497 | * @num: number of platform devices in array | |
1da177e4 LT |
498 | */ |
499 | int platform_add_devices(struct platform_device **devs, int num) | |
500 | { | |
501 | int i, ret = 0; | |
502 | ||
503 | for (i = 0; i < num; i++) { | |
504 | ret = platform_device_register(devs[i]); | |
505 | if (ret) { | |
506 | while (--i >= 0) | |
507 | platform_device_unregister(devs[i]); | |
508 | break; | |
509 | } | |
510 | } | |
511 | ||
512 | return ret; | |
513 | } | |
a96b2042 | 514 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 515 | |
37c12e74 RK |
516 | struct platform_object { |
517 | struct platform_device pdev; | |
1cec24c5 | 518 | char name[]; |
37c12e74 RK |
519 | }; |
520 | ||
cdfee562 CH |
521 | /* |
522 | * Set up default DMA mask for platform devices if the they weren't | |
523 | * previously set by the architecture / DT. | |
524 | */ | |
525 | static void setup_pdev_dma_masks(struct platform_device *pdev) | |
526 | { | |
9495b7e9 UH |
527 | pdev->dev.dma_parms = &pdev->dma_parms; |
528 | ||
cdfee562 CH |
529 | if (!pdev->dev.coherent_dma_mask) |
530 | pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); | |
e3a36eb6 CH |
531 | if (!pdev->dev.dma_mask) { |
532 | pdev->platform_dma_mask = DMA_BIT_MASK(32); | |
533 | pdev->dev.dma_mask = &pdev->platform_dma_mask; | |
534 | } | |
cdfee562 CH |
535 | }; |
536 | ||
1da177e4 | 537 | /** |
3c31f07a | 538 | * platform_device_put - destroy a platform device |
4a3ad20c | 539 | * @pdev: platform device to free |
37c12e74 | 540 | * |
4a3ad20c GKH |
541 | * Free all memory associated with a platform device. This function must |
542 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
543 | */ |
544 | void platform_device_put(struct platform_device *pdev) | |
545 | { | |
99fef587 | 546 | if (!IS_ERR_OR_NULL(pdev)) |
37c12e74 RK |
547 | put_device(&pdev->dev); |
548 | } | |
549 | EXPORT_SYMBOL_GPL(platform_device_put); | |
550 | ||
551 | static void platform_device_release(struct device *dev) | |
552 | { | |
4a3ad20c GKH |
553 | struct platform_object *pa = container_of(dev, struct platform_object, |
554 | pdev.dev); | |
37c12e74 | 555 | |
cb8be8b4 | 556 | of_node_put(pa->pdev.dev.of_node); |
37c12e74 | 557 | kfree(pa->pdev.dev.platform_data); |
e710d7d5 | 558 | kfree(pa->pdev.mfd_cell); |
37c12e74 | 559 | kfree(pa->pdev.resource); |
3d713e0e | 560 | kfree(pa->pdev.driver_override); |
37c12e74 RK |
561 | kfree(pa); |
562 | } | |
563 | ||
564 | /** | |
3c31f07a | 565 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
566 | * @name: base name of the device we're adding |
567 | * @id: instance id | |
37c12e74 | 568 | * |
4a3ad20c GKH |
569 | * Create a platform device object which can have other objects attached |
570 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 571 | */ |
1359555e | 572 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
573 | { |
574 | struct platform_object *pa; | |
575 | ||
1cec24c5 | 576 | pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL); |
37c12e74 RK |
577 | if (pa) { |
578 | strcpy(pa->name, name); | |
579 | pa->pdev.name = pa->name; | |
580 | pa->pdev.id = id; | |
581 | device_initialize(&pa->pdev.dev); | |
582 | pa->pdev.dev.release = platform_device_release; | |
cdfee562 | 583 | setup_pdev_dma_masks(&pa->pdev); |
37c12e74 RK |
584 | } |
585 | ||
93ce3061 | 586 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
587 | } |
588 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
589 | ||
590 | /** | |
3c31f07a | 591 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
592 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
593 | * @res: set of resources that needs to be allocated for the device | |
594 | * @num: number of resources | |
37c12e74 | 595 | * |
4a3ad20c GKH |
596 | * Add a copy of the resources to the platform device. The memory |
597 | * associated with the resources will be freed when the platform device is | |
598 | * released. | |
37c12e74 | 599 | */ |
4a3ad20c | 600 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 601 | const struct resource *res, unsigned int num) |
37c12e74 | 602 | { |
cea89623 | 603 | struct resource *r = NULL; |
37c12e74 | 604 | |
cea89623 UKK |
605 | if (res) { |
606 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); | |
607 | if (!r) | |
608 | return -ENOMEM; | |
37c12e74 | 609 | } |
cea89623 | 610 | |
4a03d6f7 | 611 | kfree(pdev->resource); |
cea89623 UKK |
612 | pdev->resource = r; |
613 | pdev->num_resources = num; | |
614 | return 0; | |
37c12e74 RK |
615 | } |
616 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
617 | ||
618 | /** | |
3c31f07a | 619 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
620 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
621 | * @data: platform specific data for this platform device | |
622 | * @size: size of platform specific data | |
37c12e74 | 623 | * |
4a3ad20c GKH |
624 | * Add a copy of platform specific data to the platform device's |
625 | * platform_data pointer. The memory associated with the platform data | |
626 | * will be freed when the platform device is released. | |
37c12e74 | 627 | */ |
4a3ad20c GKH |
628 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
629 | size_t size) | |
37c12e74 | 630 | { |
27a33f9e | 631 | void *d = NULL; |
5cfc64ce | 632 | |
27a33f9e UKK |
633 | if (data) { |
634 | d = kmemdup(data, size, GFP_KERNEL); | |
635 | if (!d) | |
636 | return -ENOMEM; | |
37c12e74 | 637 | } |
27a33f9e | 638 | |
251e031d | 639 | kfree(pdev->dev.platform_data); |
27a33f9e UKK |
640 | pdev->dev.platform_data = d; |
641 | return 0; | |
37c12e74 RK |
642 | } |
643 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
644 | ||
645 | /** | |
4a3ad20c GKH |
646 | * platform_device_add - add a platform device to device hierarchy |
647 | * @pdev: platform device we're adding | |
1da177e4 | 648 | * |
4a3ad20c GKH |
649 | * This is part 2 of platform_device_register(), though may be called |
650 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 651 | */ |
37c12e74 | 652 | int platform_device_add(struct platform_device *pdev) |
1da177e4 | 653 | { |
39cc539f SS |
654 | u32 i; |
655 | int ret; | |
1da177e4 LT |
656 | |
657 | if (!pdev) | |
658 | return -EINVAL; | |
659 | ||
660 | if (!pdev->dev.parent) | |
661 | pdev->dev.parent = &platform_bus; | |
662 | ||
663 | pdev->dev.bus = &platform_bus_type; | |
664 | ||
689ae231 JD |
665 | switch (pdev->id) { |
666 | default: | |
1e0b2cf9 | 667 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
689ae231 JD |
668 | break; |
669 | case PLATFORM_DEVID_NONE: | |
acc0e90f | 670 | dev_set_name(&pdev->dev, "%s", pdev->name); |
689ae231 JD |
671 | break; |
672 | case PLATFORM_DEVID_AUTO: | |
673 | /* | |
674 | * Automatically allocated device ID. We mark it as such so | |
675 | * that we remember it must be freed, and we append a suffix | |
676 | * to avoid namespace collision with explicit IDs. | |
677 | */ | |
0de75116 | 678 | ret = ida_alloc(&platform_devid_ida, GFP_KERNEL); |
689ae231 | 679 | if (ret < 0) |
5da7f709 | 680 | goto err_out; |
689ae231 JD |
681 | pdev->id = ret; |
682 | pdev->id_auto = true; | |
683 | dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); | |
684 | break; | |
685 | } | |
1da177e4 LT |
686 | |
687 | for (i = 0; i < pdev->num_resources; i++) { | |
5da7f709 | 688 | struct resource *p, *r = &pdev->resource[i]; |
1da177e4 LT |
689 | |
690 | if (r->name == NULL) | |
1e0b2cf9 | 691 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
692 | |
693 | p = r->parent; | |
694 | if (!p) { | |
0e6c861f | 695 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 696 | p = &iomem_resource; |
0e6c861f | 697 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
698 | p = &ioport_resource; |
699 | } | |
700 | ||
25ebcb7d AS |
701 | if (p) { |
702 | ret = insert_resource(p, r); | |
703 | if (ret) { | |
704 | dev_err(&pdev->dev, "failed to claim resource %d: %pR\n", i, r); | |
705 | goto failed; | |
706 | } | |
5da7f709 | 707 | } |
1da177e4 LT |
708 | } |
709 | ||
710 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 711 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 712 | |
e3915532 | 713 | ret = device_add(&pdev->dev); |
8b2dceba GKH |
714 | if (ret == 0) |
715 | return ret; | |
716 | ||
5da7f709 | 717 | failed: |
8b2dceba | 718 | if (pdev->id_auto) { |
0de75116 | 719 | ida_free(&platform_devid_ida, pdev->id); |
8b2dceba GKH |
720 | pdev->id = PLATFORM_DEVID_AUTO; |
721 | } | |
722 | ||
0707cfa5 | 723 | while (i--) { |
8b2dceba | 724 | struct resource *r = &pdev->resource[i]; |
7f5dcaf1 | 725 | if (r->parent) |
8b2dceba GKH |
726 | release_resource(r); |
727 | } | |
c9f66169 | 728 | |
5da7f709 | 729 | err_out: |
1da177e4 LT |
730 | return ret; |
731 | } | |
37c12e74 RK |
732 | EXPORT_SYMBOL_GPL(platform_device_add); |
733 | ||
734 | /** | |
4a3ad20c GKH |
735 | * platform_device_del - remove a platform-level device |
736 | * @pdev: platform device we're removing | |
1da177e4 | 737 | * |
4a3ad20c GKH |
738 | * Note that this function will also release all memory- and port-based |
739 | * resources owned by the device (@dev->resource). This function must | |
740 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 741 | */ |
93ce3061 | 742 | void platform_device_del(struct platform_device *pdev) |
1da177e4 | 743 | { |
39cc539f | 744 | u32 i; |
c9f66169 | 745 | |
99fef587 | 746 | if (!IS_ERR_OR_NULL(pdev)) { |
8b2dceba GKH |
747 | device_del(&pdev->dev); |
748 | ||
749 | if (pdev->id_auto) { | |
0de75116 | 750 | ida_free(&platform_devid_ida, pdev->id); |
8b2dceba GKH |
751 | pdev->id = PLATFORM_DEVID_AUTO; |
752 | } | |
753 | ||
754 | for (i = 0; i < pdev->num_resources; i++) { | |
755 | struct resource *r = &pdev->resource[i]; | |
7f5dcaf1 | 756 | if (r->parent) |
8b2dceba GKH |
757 | release_resource(r); |
758 | } | |
759 | } | |
1da177e4 | 760 | } |
93ce3061 DT |
761 | EXPORT_SYMBOL_GPL(platform_device_del); |
762 | ||
763 | /** | |
4a3ad20c GKH |
764 | * platform_device_register - add a platform-level device |
765 | * @pdev: platform device we're adding | |
67e532a4 JH |
766 | * |
767 | * NOTE: _Never_ directly free @pdev after calling this function, even if it | |
768 | * returned an error! Always use platform_device_put() to give up the | |
769 | * reference initialised in this function instead. | |
93ce3061 | 770 | */ |
4a3ad20c | 771 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
772 | { |
773 | device_initialize(&pdev->dev); | |
cdfee562 | 774 | setup_pdev_dma_masks(pdev); |
93ce3061 DT |
775 | return platform_device_add(pdev); |
776 | } | |
a96b2042 | 777 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
778 | |
779 | /** | |
4a3ad20c GKH |
780 | * platform_device_unregister - unregister a platform-level device |
781 | * @pdev: platform device we're unregistering | |
93ce3061 | 782 | * |
4a3ad20c GKH |
783 | * Unregistration is done in 2 steps. First we release all resources |
784 | * and remove it from the subsystem, then we drop reference count by | |
785 | * calling platform_device_put(). | |
93ce3061 | 786 | */ |
4a3ad20c | 787 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
788 | { |
789 | platform_device_del(pdev); | |
790 | platform_device_put(pdev); | |
791 | } | |
a96b2042 | 792 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 793 | |
1da177e4 | 794 | /** |
01dcc60a | 795 | * platform_device_register_full - add a platform-level device with |
44f28bde | 796 | * resources and platform-specific data |
49a4ec18 | 797 | * |
01dcc60a | 798 | * @pdevinfo: data used to create device |
d8bf2540 | 799 | * |
f0eae0ed | 800 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 801 | */ |
01dcc60a | 802 | struct platform_device *platform_device_register_full( |
5a3072be | 803 | const struct platform_device_info *pdevinfo) |
d8bf2540 | 804 | { |
45bb08de | 805 | int ret; |
d8bf2540 | 806 | struct platform_device *pdev; |
d8bf2540 | 807 | |
01dcc60a | 808 | pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
44f28bde | 809 | if (!pdev) |
36cf3b13 | 810 | return ERR_PTR(-ENOMEM); |
01dcc60a UKK |
811 | |
812 | pdev->dev.parent = pdevinfo->parent; | |
ce793486 | 813 | pdev->dev.fwnode = pdevinfo->fwnode; |
2c1ea6ab MR |
814 | pdev->dev.of_node = of_node_get(to_of_node(pdev->dev.fwnode)); |
815 | pdev->dev.of_node_reused = pdevinfo->of_node_reused; | |
01dcc60a UKK |
816 | |
817 | if (pdevinfo->dma_mask) { | |
e3a36eb6 CH |
818 | pdev->platform_dma_mask = pdevinfo->dma_mask; |
819 | pdev->dev.dma_mask = &pdev->platform_dma_mask; | |
01dcc60a UKK |
820 | pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; |
821 | } | |
d8bf2540 | 822 | |
01dcc60a UKK |
823 | ret = platform_device_add_resources(pdev, |
824 | pdevinfo->res, pdevinfo->num_res); | |
807508c8 AV |
825 | if (ret) |
826 | goto err; | |
44f28bde | 827 | |
01dcc60a UKK |
828 | ret = platform_device_add_data(pdev, |
829 | pdevinfo->data, pdevinfo->size_data); | |
807508c8 AV |
830 | if (ret) |
831 | goto err; | |
d8bf2540 | 832 | |
f4d05266 | 833 | if (pdevinfo->properties) { |
bd1e336a HK |
834 | ret = device_create_managed_software_node(&pdev->dev, |
835 | pdevinfo->properties, NULL); | |
00bbc1d8 MW |
836 | if (ret) |
837 | goto err; | |
838 | } | |
839 | ||
44f28bde UKK |
840 | ret = platform_device_add(pdev); |
841 | if (ret) { | |
842 | err: | |
7b199811 | 843 | ACPI_COMPANION_SET(&pdev->dev, NULL); |
44f28bde UKK |
844 | platform_device_put(pdev); |
845 | return ERR_PTR(ret); | |
846 | } | |
d8bf2540 DB |
847 | |
848 | return pdev; | |
d8bf2540 | 849 | } |
01dcc60a | 850 | EXPORT_SYMBOL_GPL(platform_device_register_full); |
d8bf2540 | 851 | |
00d3dcdd | 852 | /** |
9447057e | 853 | * __platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 854 | * @drv: platform driver structure |
08801f96 | 855 | * @owner: owning module/driver |
00d3dcdd | 856 | */ |
9447057e LC |
857 | int __platform_driver_register(struct platform_driver *drv, |
858 | struct module *owner) | |
00d3dcdd | 859 | { |
9447057e | 860 | drv->driver.owner = owner; |
00d3dcdd | 861 | drv->driver.bus = &platform_bus_type; |
783ea7d4 | 862 | |
00d3dcdd RK |
863 | return driver_register(&drv->driver); |
864 | } | |
9447057e | 865 | EXPORT_SYMBOL_GPL(__platform_driver_register); |
00d3dcdd RK |
866 | |
867 | /** | |
3c31f07a | 868 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 869 | * @drv: platform driver structure |
00d3dcdd RK |
870 | */ |
871 | void platform_driver_unregister(struct platform_driver *drv) | |
872 | { | |
873 | driver_unregister(&drv->driver); | |
874 | } | |
875 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
876 | ||
16085668 | 877 | static int platform_probe_fail(struct platform_device *pdev) |
e21d740a UKK |
878 | { |
879 | return -ENXIO; | |
880 | } | |
881 | ||
c67334fb | 882 | /** |
c3b50dc2 | 883 | * __platform_driver_probe - register driver for non-hotpluggable device |
c67334fb | 884 | * @drv: platform driver structure |
3f9120b0 | 885 | * @probe: the driver probe routine, probably from an __init section |
c3b50dc2 | 886 | * @module: module which will be the owner of the driver |
c67334fb DB |
887 | * |
888 | * Use this instead of platform_driver_register() when you know the device | |
889 | * is not hotpluggable and has already been registered, and you want to | |
890 | * remove its run-once probe() infrastructure from memory after the driver | |
891 | * has bound to the device. | |
892 | * | |
893 | * One typical use for this would be with drivers for controllers integrated | |
894 | * into system-on-chip processors, where the controller devices have been | |
895 | * configured as part of board setup. | |
896 | * | |
3f9120b0 | 897 | * Note that this is incompatible with deferred probing. |
647c86d0 | 898 | * |
c67334fb DB |
899 | * Returns zero if the driver registered and bound to a device, else returns |
900 | * a negative error code and with the driver not registered. | |
901 | */ | |
c3b50dc2 WS |
902 | int __init_or_module __platform_driver_probe(struct platform_driver *drv, |
903 | int (*probe)(struct platform_device *), struct module *module) | |
c67334fb DB |
904 | { |
905 | int retval, code; | |
906 | ||
5c36eb2a DT |
907 | if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) { |
908 | pr_err("%s: drivers registered with %s can not be probed asynchronously\n", | |
909 | drv->driver.name, __func__); | |
910 | return -EINVAL; | |
911 | } | |
912 | ||
913 | /* | |
914 | * We have to run our probes synchronously because we check if | |
915 | * we find any devices to bind to and exit with error if there | |
916 | * are any. | |
917 | */ | |
918 | drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS; | |
919 | ||
3f9120b0 JH |
920 | /* |
921 | * Prevent driver from requesting probe deferral to avoid further | |
922 | * futile probe attempts. | |
923 | */ | |
924 | drv->prevent_deferred_probe = true; | |
925 | ||
1a6f2a75 DT |
926 | /* make sure driver won't have bind/unbind attributes */ |
927 | drv->driver.suppress_bind_attrs = true; | |
928 | ||
c67334fb DB |
929 | /* temporary section violation during probe() */ |
930 | drv->probe = probe; | |
c3b50dc2 | 931 | retval = code = __platform_driver_register(drv, module); |
388bcc6e KS |
932 | if (retval) |
933 | return retval; | |
c67334fb | 934 | |
1a6f2a75 DT |
935 | /* |
936 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
937 | * the list of drivers in order to probe new devices. Check to see |
938 | * if the probe was successful, and make sure any forced probes of | |
939 | * new devices fail. | |
940 | */ | |
d79d3244 | 941 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
16085668 | 942 | drv->probe = platform_probe_fail; |
e5dd1278 | 943 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb | 944 | retval = -ENODEV; |
d79d3244 | 945 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
946 | |
947 | if (code != retval) | |
948 | platform_driver_unregister(drv); | |
949 | return retval; | |
950 | } | |
c3b50dc2 | 951 | EXPORT_SYMBOL_GPL(__platform_driver_probe); |
1da177e4 | 952 | |
ecdf6ceb | 953 | /** |
291f653a | 954 | * __platform_create_bundle - register driver and create corresponding device |
ecdf6ceb DT |
955 | * @driver: platform driver structure |
956 | * @probe: the driver probe routine, probably from an __init section | |
957 | * @res: set of resources that needs to be allocated for the device | |
958 | * @n_res: number of resources | |
959 | * @data: platform specific data for this platform device | |
960 | * @size: size of platform specific data | |
291f653a | 961 | * @module: module which will be the owner of the driver |
ecdf6ceb DT |
962 | * |
963 | * Use this in legacy-style modules that probe hardware directly and | |
964 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
965 | * |
966 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb | 967 | */ |
291f653a | 968 | struct platform_device * __init_or_module __platform_create_bundle( |
ecdf6ceb DT |
969 | struct platform_driver *driver, |
970 | int (*probe)(struct platform_device *), | |
971 | struct resource *res, unsigned int n_res, | |
291f653a | 972 | const void *data, size_t size, struct module *module) |
ecdf6ceb DT |
973 | { |
974 | struct platform_device *pdev; | |
975 | int error; | |
976 | ||
977 | pdev = platform_device_alloc(driver->driver.name, -1); | |
978 | if (!pdev) { | |
979 | error = -ENOMEM; | |
980 | goto err_out; | |
981 | } | |
982 | ||
807508c8 AV |
983 | error = platform_device_add_resources(pdev, res, n_res); |
984 | if (error) | |
985 | goto err_pdev_put; | |
ecdf6ceb | 986 | |
807508c8 AV |
987 | error = platform_device_add_data(pdev, data, size); |
988 | if (error) | |
989 | goto err_pdev_put; | |
ecdf6ceb DT |
990 | |
991 | error = platform_device_add(pdev); | |
992 | if (error) | |
993 | goto err_pdev_put; | |
994 | ||
291f653a | 995 | error = __platform_driver_probe(driver, probe, module); |
ecdf6ceb DT |
996 | if (error) |
997 | goto err_pdev_del; | |
998 | ||
999 | return pdev; | |
1000 | ||
1001 | err_pdev_del: | |
1002 | platform_device_del(pdev); | |
1003 | err_pdev_put: | |
1004 | platform_device_put(pdev); | |
1005 | err_out: | |
1006 | return ERR_PTR(error); | |
1007 | } | |
291f653a | 1008 | EXPORT_SYMBOL_GPL(__platform_create_bundle); |
ecdf6ceb | 1009 | |
dbe2256d TR |
1010 | /** |
1011 | * __platform_register_drivers - register an array of platform drivers | |
1012 | * @drivers: an array of drivers to register | |
1013 | * @count: the number of drivers to register | |
1014 | * @owner: module owning the drivers | |
1015 | * | |
1016 | * Registers platform drivers specified by an array. On failure to register a | |
1017 | * driver, all previously registered drivers will be unregistered. Callers of | |
1018 | * this API should use platform_unregister_drivers() to unregister drivers in | |
1019 | * the reverse order. | |
1020 | * | |
1021 | * Returns: 0 on success or a negative error code on failure. | |
1022 | */ | |
1023 | int __platform_register_drivers(struct platform_driver * const *drivers, | |
1024 | unsigned int count, struct module *owner) | |
1025 | { | |
1026 | unsigned int i; | |
1027 | int err; | |
1028 | ||
1029 | for (i = 0; i < count; i++) { | |
1030 | pr_debug("registering platform driver %ps\n", drivers[i]); | |
1031 | ||
1032 | err = __platform_driver_register(drivers[i], owner); | |
1033 | if (err < 0) { | |
1034 | pr_err("failed to register platform driver %ps: %d\n", | |
1035 | drivers[i], err); | |
1036 | goto error; | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | return 0; | |
1041 | ||
1042 | error: | |
1043 | while (i--) { | |
1044 | pr_debug("unregistering platform driver %ps\n", drivers[i]); | |
1045 | platform_driver_unregister(drivers[i]); | |
1046 | } | |
1047 | ||
1048 | return err; | |
1049 | } | |
1050 | EXPORT_SYMBOL_GPL(__platform_register_drivers); | |
1051 | ||
1052 | /** | |
1053 | * platform_unregister_drivers - unregister an array of platform drivers | |
1054 | * @drivers: an array of drivers to unregister | |
1055 | * @count: the number of drivers to unregister | |
1056 | * | |
c82c83c3 | 1057 | * Unregisters platform drivers specified by an array. This is typically used |
dbe2256d TR |
1058 | * to complement an earlier call to platform_register_drivers(). Drivers are |
1059 | * unregistered in the reverse order in which they were registered. | |
1060 | */ | |
1061 | void platform_unregister_drivers(struct platform_driver * const *drivers, | |
1062 | unsigned int count) | |
1063 | { | |
1064 | while (count--) { | |
1065 | pr_debug("unregistering platform driver %ps\n", drivers[count]); | |
1066 | platform_driver_unregister(drivers[count]); | |
1067 | } | |
1068 | } | |
1069 | EXPORT_SYMBOL_GPL(platform_unregister_drivers); | |
1070 | ||
57fee4a5 | 1071 | static const struct platform_device_id *platform_match_id( |
831fad2f | 1072 | const struct platform_device_id *id, |
57fee4a5 EM |
1073 | struct platform_device *pdev) |
1074 | { | |
1075 | while (id->name[0]) { | |
391c0325 | 1076 | if (strcmp(pdev->name, id->name) == 0) { |
57fee4a5 EM |
1077 | pdev->id_entry = id; |
1078 | return id; | |
1079 | } | |
1080 | id++; | |
1081 | } | |
1082 | return NULL; | |
1083 | } | |
1084 | ||
25e18499 RW |
1085 | #ifdef CONFIG_PM_SLEEP |
1086 | ||
1087 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 1088 | { |
783ea7d4 MD |
1089 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
1090 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
1091 | int ret = 0; |
1092 | ||
783ea7d4 MD |
1093 | if (dev->driver && pdrv->suspend) |
1094 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
1095 | |
1096 | return ret; | |
1097 | } | |
1098 | ||
25e18499 | 1099 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 1100 | { |
783ea7d4 MD |
1101 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
1102 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
1103 | int ret = 0; |
1104 | ||
783ea7d4 MD |
1105 | if (dev->driver && pdrv->resume) |
1106 | ret = pdrv->resume(pdev); | |
9480e307 | 1107 | |
1da177e4 LT |
1108 | return ret; |
1109 | } | |
1110 | ||
69c9dd1e | 1111 | #endif /* CONFIG_PM_SLEEP */ |
9d730229 | 1112 | |
25e18499 RW |
1113 | #ifdef CONFIG_SUSPEND |
1114 | ||
69c9dd1e | 1115 | int platform_pm_suspend(struct device *dev) |
25e18499 RW |
1116 | { |
1117 | struct device_driver *drv = dev->driver; | |
1118 | int ret = 0; | |
1119 | ||
adf09493 RW |
1120 | if (!drv) |
1121 | return 0; | |
1122 | ||
1123 | if (drv->pm) { | |
25e18499 RW |
1124 | if (drv->pm->suspend) |
1125 | ret = drv->pm->suspend(dev); | |
1126 | } else { | |
1127 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
1128 | } | |
1129 | ||
1130 | return ret; | |
1131 | } | |
1132 | ||
69c9dd1e | 1133 | int platform_pm_resume(struct device *dev) |
25e18499 RW |
1134 | { |
1135 | struct device_driver *drv = dev->driver; | |
1136 | int ret = 0; | |
1137 | ||
adf09493 RW |
1138 | if (!drv) |
1139 | return 0; | |
1140 | ||
1141 | if (drv->pm) { | |
25e18499 RW |
1142 | if (drv->pm->resume) |
1143 | ret = drv->pm->resume(dev); | |
1144 | } else { | |
1145 | ret = platform_legacy_resume(dev); | |
1146 | } | |
1147 | ||
1148 | return ret; | |
1149 | } | |
1150 | ||
69c9dd1e | 1151 | #endif /* CONFIG_SUSPEND */ |
25e18499 | 1152 | |
1f112cee | 1153 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 | 1154 | |
69c9dd1e | 1155 | int platform_pm_freeze(struct device *dev) |
25e18499 RW |
1156 | { |
1157 | struct device_driver *drv = dev->driver; | |
1158 | int ret = 0; | |
1159 | ||
1160 | if (!drv) | |
1161 | return 0; | |
1162 | ||
1163 | if (drv->pm) { | |
1164 | if (drv->pm->freeze) | |
1165 | ret = drv->pm->freeze(dev); | |
1166 | } else { | |
1167 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
1168 | } | |
1169 | ||
1170 | return ret; | |
1171 | } | |
1172 | ||
69c9dd1e | 1173 | int platform_pm_thaw(struct device *dev) |
25e18499 RW |
1174 | { |
1175 | struct device_driver *drv = dev->driver; | |
1176 | int ret = 0; | |
1177 | ||
adf09493 RW |
1178 | if (!drv) |
1179 | return 0; | |
1180 | ||
1181 | if (drv->pm) { | |
25e18499 RW |
1182 | if (drv->pm->thaw) |
1183 | ret = drv->pm->thaw(dev); | |
1184 | } else { | |
1185 | ret = platform_legacy_resume(dev); | |
1186 | } | |
1187 | ||
1188 | return ret; | |
1189 | } | |
1190 | ||
69c9dd1e | 1191 | int platform_pm_poweroff(struct device *dev) |
25e18499 RW |
1192 | { |
1193 | struct device_driver *drv = dev->driver; | |
1194 | int ret = 0; | |
1195 | ||
adf09493 RW |
1196 | if (!drv) |
1197 | return 0; | |
1198 | ||
1199 | if (drv->pm) { | |
25e18499 RW |
1200 | if (drv->pm->poweroff) |
1201 | ret = drv->pm->poweroff(dev); | |
1202 | } else { | |
1203 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
1204 | } | |
1205 | ||
1206 | return ret; | |
1207 | } | |
1208 | ||
69c9dd1e | 1209 | int platform_pm_restore(struct device *dev) |
25e18499 RW |
1210 | { |
1211 | struct device_driver *drv = dev->driver; | |
1212 | int ret = 0; | |
1213 | ||
adf09493 RW |
1214 | if (!drv) |
1215 | return 0; | |
1216 | ||
1217 | if (drv->pm) { | |
25e18499 RW |
1218 | if (drv->pm->restore) |
1219 | ret = drv->pm->restore(dev); | |
1220 | } else { | |
1221 | ret = platform_legacy_resume(dev); | |
1222 | } | |
1223 | ||
1224 | return ret; | |
1225 | } | |
1226 | ||
69c9dd1e | 1227 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 1228 | |
e21d740a UKK |
1229 | /* modalias support enables more hands-off userspace setup: |
1230 | * (a) environment variable lets new-style hotplug events work once system is | |
1231 | * fully running: "modprobe $MODALIAS" | |
1232 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
1233 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
1234 | */ | |
1235 | static ssize_t modalias_show(struct device *dev, | |
1236 | struct device_attribute *attr, char *buf) | |
1237 | { | |
1238 | struct platform_device *pdev = to_platform_device(dev); | |
1239 | int len; | |
1240 | ||
1241 | len = of_device_modalias(dev, buf, PAGE_SIZE); | |
1242 | if (len != -ENODEV) | |
1243 | return len; | |
1244 | ||
1245 | len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1); | |
1246 | if (len != -ENODEV) | |
1247 | return len; | |
1248 | ||
1249 | return sysfs_emit(buf, "platform:%s\n", pdev->name); | |
1250 | } | |
1251 | static DEVICE_ATTR_RO(modalias); | |
1252 | ||
1253 | static ssize_t numa_node_show(struct device *dev, | |
1254 | struct device_attribute *attr, char *buf) | |
1255 | { | |
1256 | return sysfs_emit(buf, "%d\n", dev_to_node(dev)); | |
1257 | } | |
1258 | static DEVICE_ATTR_RO(numa_node); | |
1259 | ||
1260 | static ssize_t driver_override_show(struct device *dev, | |
1261 | struct device_attribute *attr, char *buf) | |
1262 | { | |
1263 | struct platform_device *pdev = to_platform_device(dev); | |
1264 | ssize_t len; | |
1265 | ||
1266 | device_lock(dev); | |
1267 | len = sysfs_emit(buf, "%s\n", pdev->driver_override); | |
1268 | device_unlock(dev); | |
1269 | ||
1270 | return len; | |
1271 | } | |
1272 | ||
1273 | static ssize_t driver_override_store(struct device *dev, | |
1274 | struct device_attribute *attr, | |
1275 | const char *buf, size_t count) | |
1276 | { | |
1277 | struct platform_device *pdev = to_platform_device(dev); | |
1278 | char *driver_override, *old, *cp; | |
1279 | ||
1280 | /* We need to keep extra room for a newline */ | |
1281 | if (count >= (PAGE_SIZE - 1)) | |
1282 | return -EINVAL; | |
1283 | ||
1284 | driver_override = kstrndup(buf, count, GFP_KERNEL); | |
1285 | if (!driver_override) | |
1286 | return -ENOMEM; | |
1287 | ||
1288 | cp = strchr(driver_override, '\n'); | |
1289 | if (cp) | |
1290 | *cp = '\0'; | |
1291 | ||
1292 | device_lock(dev); | |
1293 | old = pdev->driver_override; | |
1294 | if (strlen(driver_override)) { | |
1295 | pdev->driver_override = driver_override; | |
1296 | } else { | |
1297 | kfree(driver_override); | |
1298 | pdev->driver_override = NULL; | |
1299 | } | |
1300 | device_unlock(dev); | |
1301 | ||
1302 | kfree(old); | |
1303 | ||
1304 | return count; | |
1305 | } | |
1306 | static DEVICE_ATTR_RW(driver_override); | |
1307 | ||
1308 | static struct attribute *platform_dev_attrs[] = { | |
1309 | &dev_attr_modalias.attr, | |
1310 | &dev_attr_numa_node.attr, | |
1311 | &dev_attr_driver_override.attr, | |
1312 | NULL, | |
1313 | }; | |
1314 | ||
1315 | static umode_t platform_dev_attrs_visible(struct kobject *kobj, struct attribute *a, | |
1316 | int n) | |
1317 | { | |
1318 | struct device *dev = container_of(kobj, typeof(*dev), kobj); | |
1319 | ||
1320 | if (a == &dev_attr_numa_node.attr && | |
1321 | dev_to_node(dev) == NUMA_NO_NODE) | |
1322 | return 0; | |
1323 | ||
1324 | return a->mode; | |
1325 | } | |
1326 | ||
5a576764 | 1327 | static const struct attribute_group platform_dev_group = { |
e21d740a UKK |
1328 | .attrs = platform_dev_attrs, |
1329 | .is_visible = platform_dev_attrs_visible, | |
1330 | }; | |
1331 | __ATTRIBUTE_GROUPS(platform_dev); | |
1332 | ||
1333 | ||
1334 | /** | |
1335 | * platform_match - bind platform device to platform driver. | |
1336 | * @dev: device. | |
1337 | * @drv: driver. | |
1338 | * | |
1339 | * Platform device IDs are assumed to be encoded like this: | |
1340 | * "<name><instance>", where <name> is a short description of the type of | |
1341 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
1342 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
1343 | * "<name>". So, extract the <name> from the platform_device structure, | |
1344 | * and compare it against the name of the driver. Return whether they match | |
1345 | * or not. | |
1346 | */ | |
1347 | static int platform_match(struct device *dev, struct device_driver *drv) | |
1348 | { | |
1349 | struct platform_device *pdev = to_platform_device(dev); | |
1350 | struct platform_driver *pdrv = to_platform_driver(drv); | |
1351 | ||
1352 | /* When driver_override is set, only bind to the matching driver */ | |
1353 | if (pdev->driver_override) | |
1354 | return !strcmp(pdev->driver_override, drv->name); | |
1355 | ||
1356 | /* Attempt an OF style match first */ | |
1357 | if (of_driver_match_device(dev, drv)) | |
1358 | return 1; | |
1359 | ||
1360 | /* Then try ACPI style match */ | |
1361 | if (acpi_driver_match_device(dev, drv)) | |
1362 | return 1; | |
1363 | ||
1364 | /* Then try to match against the id table */ | |
1365 | if (pdrv->id_table) | |
1366 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1367 | ||
1368 | /* fall-back to driver name match */ | |
1369 | return (strcmp(pdev->name, drv->name) == 0); | |
1370 | } | |
1371 | ||
1372 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) | |
1373 | { | |
1374 | struct platform_device *pdev = to_platform_device(dev); | |
1375 | int rc; | |
1376 | ||
1377 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
1378 | rc = of_device_uevent_modalias(dev, env); | |
1379 | if (rc != -ENODEV) | |
1380 | return rc; | |
1381 | ||
1382 | rc = acpi_device_uevent_modalias(dev, env); | |
1383 | if (rc != -ENODEV) | |
1384 | return rc; | |
1385 | ||
1386 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, | |
1387 | pdev->name); | |
1388 | return 0; | |
1389 | } | |
1390 | ||
9c30921f UKK |
1391 | static int platform_probe(struct device *_dev) |
1392 | { | |
1393 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
1394 | struct platform_device *dev = to_platform_device(_dev); | |
1395 | int ret; | |
1396 | ||
1397 | /* | |
1398 | * A driver registered using platform_driver_probe() cannot be bound | |
1399 | * again later because the probe function usually lives in __init code | |
1400 | * and so is gone. For these drivers .probe is set to | |
1401 | * platform_probe_fail in __platform_driver_probe(). Don't even prepare | |
1402 | * clocks and PM domains for these to match the traditional behaviour. | |
1403 | */ | |
1404 | if (unlikely(drv->probe == platform_probe_fail)) | |
1405 | return -ENXIO; | |
1406 | ||
1407 | ret = of_clk_set_defaults(_dev->of_node, false); | |
1408 | if (ret < 0) | |
1409 | return ret; | |
1410 | ||
1411 | ret = dev_pm_domain_attach(_dev, true); | |
1412 | if (ret) | |
1413 | goto out; | |
1414 | ||
1415 | if (drv->probe) { | |
1416 | ret = drv->probe(dev); | |
1417 | if (ret) | |
1418 | dev_pm_domain_detach(_dev, true); | |
1419 | } | |
1420 | ||
1421 | out: | |
1422 | if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) { | |
1423 | dev_warn(_dev, "probe deferral not supported\n"); | |
1424 | ret = -ENXIO; | |
1425 | } | |
1426 | ||
1427 | return ret; | |
1428 | } | |
1429 | ||
fc7a6209 | 1430 | static void platform_remove(struct device *_dev) |
9c30921f UKK |
1431 | { |
1432 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
1433 | struct platform_device *dev = to_platform_device(_dev); | |
9c30921f | 1434 | |
e5e1c209 UKK |
1435 | if (drv->remove) { |
1436 | int ret = drv->remove(dev); | |
1437 | ||
1438 | if (ret) | |
1439 | dev_warn(_dev, "remove callback returned a non-zero value. This will be ignored.\n"); | |
1440 | } | |
9c30921f | 1441 | dev_pm_domain_detach(_dev, true); |
9c30921f UKK |
1442 | } |
1443 | ||
1444 | static void platform_shutdown(struct device *_dev) | |
1445 | { | |
9c30921f | 1446 | struct platform_device *dev = to_platform_device(_dev); |
46e85af0 DB |
1447 | struct platform_driver *drv; |
1448 | ||
1449 | if (!_dev->driver) | |
1450 | return; | |
9c30921f | 1451 | |
46e85af0 | 1452 | drv = to_platform_driver(_dev->driver); |
9c30921f UKK |
1453 | if (drv->shutdown) |
1454 | drv->shutdown(dev); | |
1455 | } | |
1456 | ||
1457 | ||
07397df2 NG |
1458 | int platform_dma_configure(struct device *dev) |
1459 | { | |
1460 | enum dev_dma_attr attr; | |
1461 | int ret = 0; | |
1462 | ||
1463 | if (dev->of_node) { | |
3d6ce86e | 1464 | ret = of_dma_configure(dev, dev->of_node, true); |
07397df2 NG |
1465 | } else if (has_acpi_companion(dev)) { |
1466 | attr = acpi_get_dma_attr(to_acpi_device_node(dev->fwnode)); | |
e5361ca2 | 1467 | ret = acpi_dma_configure(dev, attr); |
07397df2 NG |
1468 | } |
1469 | ||
1470 | return ret; | |
1471 | } | |
1472 | ||
d9ab7716 | 1473 | static const struct dev_pm_ops platform_dev_pm_ops = { |
86854b43 | 1474 | SET_RUNTIME_PM_OPS(pm_generic_runtime_suspend, pm_generic_runtime_resume, NULL) |
69c9dd1e | 1475 | USE_PLATFORM_PM_SLEEP_OPS |
25e18499 RW |
1476 | }; |
1477 | ||
1da177e4 LT |
1478 | struct bus_type platform_bus_type = { |
1479 | .name = "platform", | |
d06262e5 | 1480 | .dev_groups = platform_dev_groups, |
1da177e4 | 1481 | .match = platform_match, |
a0245f7a | 1482 | .uevent = platform_uevent, |
9c30921f UKK |
1483 | .probe = platform_probe, |
1484 | .remove = platform_remove, | |
1485 | .shutdown = platform_shutdown, | |
07397df2 | 1486 | .dma_configure = platform_dma_configure, |
9d730229 | 1487 | .pm = &platform_dev_pm_ops, |
1da177e4 | 1488 | }; |
a96b2042 | 1489 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 | 1490 | |
492c8872 ST |
1491 | static inline int __platform_match(struct device *dev, const void *drv) |
1492 | { | |
1493 | return platform_match(dev, (struct device_driver *)drv); | |
1494 | } | |
1495 | ||
36f3313d SP |
1496 | /** |
1497 | * platform_find_device_by_driver - Find a platform device with a given | |
1498 | * driver. | |
1499 | * @start: The device to start the search from. | |
1500 | * @drv: The device driver to look for. | |
1501 | */ | |
1502 | struct device *platform_find_device_by_driver(struct device *start, | |
1503 | const struct device_driver *drv) | |
1504 | { | |
1505 | return bus_find_device(&platform_bus_type, start, drv, | |
492c8872 | 1506 | __platform_match); |
36f3313d SP |
1507 | } |
1508 | EXPORT_SYMBOL_GPL(platform_find_device_by_driver); | |
1509 | ||
eecd37e1 GR |
1510 | void __weak __init early_platform_cleanup(void) { } |
1511 | ||
1da177e4 LT |
1512 | int __init platform_bus_init(void) |
1513 | { | |
fbfb1445 CH |
1514 | int error; |
1515 | ||
eecd37e1 GR |
1516 | early_platform_cleanup(); |
1517 | ||
fbfb1445 | 1518 | error = device_register(&platform_bus); |
c8ae1674 AY |
1519 | if (error) { |
1520 | put_device(&platform_bus); | |
fbfb1445 | 1521 | return error; |
c8ae1674 | 1522 | } |
fbfb1445 CH |
1523 | error = bus_register(&platform_bus_type); |
1524 | if (error) | |
1525 | device_unregister(&platform_bus); | |
801d728c | 1526 | of_platform_register_reconfig_notifier(); |
fbfb1445 | 1527 | return error; |
1da177e4 | 1528 | } |