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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> |
512881ea LB |
33 | #include <linux/iommu.h> |
34 | #include <linux/dma-map-ops.h> | |
1da177e4 | 35 | |
a1bdc7aa | 36 | #include "base.h" |
bed2b42d | 37 | #include "power/power.h" |
a1bdc7aa | 38 | |
689ae231 JD |
39 | /* For automatically allocated device IDs */ |
40 | static DEFINE_IDA(platform_devid_ida); | |
41 | ||
1da177e4 | 42 | struct device platform_bus = { |
1e0b2cf9 | 43 | .init_name = "platform", |
1da177e4 | 44 | }; |
a96b2042 | 45 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 LT |
46 | |
47 | /** | |
4a3ad20c GKH |
48 | * platform_get_resource - get a resource for a device |
49 | * @dev: platform device | |
50 | * @type: resource type | |
51 | * @num: resource index | |
0c7a6b91 SB |
52 | * |
53 | * Return: a pointer to the resource or NULL on failure. | |
1da177e4 | 54 | */ |
4a3ad20c GKH |
55 | struct resource *platform_get_resource(struct platform_device *dev, |
56 | unsigned int type, unsigned int num) | |
1da177e4 | 57 | { |
39cc539f | 58 | u32 i; |
1da177e4 LT |
59 | |
60 | for (i = 0; i < dev->num_resources; i++) { | |
61 | struct resource *r = &dev->resource[i]; | |
62 | ||
c9f66169 MD |
63 | if (type == resource_type(r) && num-- == 0) |
64 | return r; | |
1da177e4 LT |
65 | } |
66 | return NULL; | |
67 | } | |
a96b2042 | 68 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 | 69 | |
0aec2da4 AS |
70 | struct resource *platform_get_mem_or_io(struct platform_device *dev, |
71 | unsigned int num) | |
72 | { | |
73 | u32 i; | |
74 | ||
75 | for (i = 0; i < dev->num_resources; i++) { | |
76 | struct resource *r = &dev->resource[i]; | |
77 | ||
78 | if ((resource_type(r) & (IORESOURCE_MEM|IORESOURCE_IO)) && num-- == 0) | |
79 | return r; | |
80 | } | |
81 | return NULL; | |
82 | } | |
83 | EXPORT_SYMBOL_GPL(platform_get_mem_or_io); | |
84 | ||
bb6243b4 | 85 | #ifdef CONFIG_HAS_IOMEM |
890cc39a DZ |
86 | /** |
87 | * devm_platform_get_and_ioremap_resource - call devm_ioremap_resource() for a | |
88 | * platform device and get resource | |
89 | * | |
90 | * @pdev: platform device to use both for memory resource lookup as well as | |
91 | * resource management | |
92 | * @index: resource index | |
93 | * @res: optional output parameter to store a pointer to the obtained resource. | |
0c7a6b91 SB |
94 | * |
95 | * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code | |
96 | * on failure. | |
890cc39a DZ |
97 | */ |
98 | void __iomem * | |
99 | devm_platform_get_and_ioremap_resource(struct platform_device *pdev, | |
100 | unsigned int index, struct resource **res) | |
101 | { | |
102 | struct resource *r; | |
103 | ||
104 | r = platform_get_resource(pdev, IORESOURCE_MEM, index); | |
105 | if (res) | |
106 | *res = r; | |
107 | return devm_ioremap_resource(&pdev->dev, r); | |
108 | } | |
109 | EXPORT_SYMBOL_GPL(devm_platform_get_and_ioremap_resource); | |
110 | ||
7945f929 BG |
111 | /** |
112 | * devm_platform_ioremap_resource - call devm_ioremap_resource() for a platform | |
113 | * device | |
114 | * | |
115 | * @pdev: platform device to use both for memory resource lookup as well as | |
7067c96e | 116 | * resource management |
7945f929 | 117 | * @index: resource index |
0c7a6b91 SB |
118 | * |
119 | * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code | |
120 | * on failure. | |
7945f929 BG |
121 | */ |
122 | void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev, | |
123 | unsigned int index) | |
124 | { | |
fd78901c | 125 | return devm_platform_get_and_ioremap_resource(pdev, index, NULL); |
7945f929 BG |
126 | } |
127 | EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource); | |
bb6243b4 | 128 | |
c9c8641d BG |
129 | /** |
130 | * devm_platform_ioremap_resource_byname - call devm_ioremap_resource for | |
131 | * a platform device, retrieve the | |
132 | * resource by name | |
133 | * | |
134 | * @pdev: platform device to use both for memory resource lookup as well as | |
135 | * resource management | |
136 | * @name: name of the resource | |
0c7a6b91 SB |
137 | * |
138 | * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code | |
139 | * on failure. | |
c9c8641d BG |
140 | */ |
141 | void __iomem * | |
142 | devm_platform_ioremap_resource_byname(struct platform_device *pdev, | |
143 | const char *name) | |
144 | { | |
145 | struct resource *res; | |
146 | ||
147 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name); | |
148 | return devm_ioremap_resource(&pdev->dev, res); | |
149 | } | |
150 | EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource_byname); | |
837ccda3 | 151 | #endif /* CONFIG_HAS_IOMEM */ |
7945f929 | 152 | |
c2f3f755 GKH |
153 | /** |
154 | * platform_get_irq_optional - get an optional IRQ for a device | |
155 | * @dev: platform device | |
156 | * @num: IRQ number index | |
157 | * | |
158 | * Gets an IRQ for a platform device. Device drivers should check the return | |
159 | * value for errors so as to not pass a negative integer value to the | |
160 | * request_irq() APIs. This is the same as platform_get_irq(), except that it | |
161 | * does not print an error message if an IRQ can not be obtained. | |
162 | * | |
163 | * For example:: | |
164 | * | |
165 | * int irq = platform_get_irq_optional(pdev, 0); | |
166 | * if (irq < 0) | |
167 | * return irq; | |
168 | * | |
169 | * Return: non-zero IRQ number on success, negative error number on failure. | |
170 | */ | |
171 | int platform_get_irq_optional(struct platform_device *dev, unsigned int num) | |
1da177e4 | 172 | { |
a85a6c86 | 173 | int ret; |
5cf8f7db AL |
174 | #ifdef CONFIG_SPARC |
175 | /* sparc does not have irqs represented as IORESOURCE_IRQ resources */ | |
176 | if (!dev || num >= dev->archdata.num_irqs) | |
c99f4ebc | 177 | goto out_not_found; |
a85a6c86 BH |
178 | ret = dev->archdata.irqs[num]; |
179 | goto out; | |
5cf8f7db | 180 | #else |
9ec36caf | 181 | struct resource *r; |
aff008ad | 182 | |
71564a26 | 183 | if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) { |
aff008ad | 184 | ret = of_irq_get(dev->dev.of_node, num); |
e330b9a6 | 185 | if (ret > 0 || ret == -EPROBE_DEFER) |
a85a6c86 | 186 | goto out; |
aff008ad | 187 | } |
9ec36caf RH |
188 | |
189 | r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
d44fa3d4 AVF |
190 | if (has_acpi_companion(&dev->dev)) { |
191 | if (r && r->flags & IORESOURCE_DISABLED) { | |
d44fa3d4 AVF |
192 | ret = acpi_irq_get(ACPI_HANDLE(&dev->dev), num, r); |
193 | if (ret) | |
a85a6c86 | 194 | goto out; |
d44fa3d4 AVF |
195 | } |
196 | } | |
197 | ||
7085a740 LW |
198 | /* |
199 | * The resources may pass trigger flags to the irqs that need | |
200 | * to be set up. It so happens that the trigger flags for | |
201 | * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER* | |
202 | * settings. | |
203 | */ | |
60ca5e0d GR |
204 | if (r && r->flags & IORESOURCE_BITS) { |
205 | struct irq_data *irqd; | |
206 | ||
207 | irqd = irq_get_irq_data(r->start); | |
c99f4ebc AS |
208 | if (!irqd) |
209 | goto out_not_found; | |
60ca5e0d GR |
210 | irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS); |
211 | } | |
1da177e4 | 212 | |
a85a6c86 BH |
213 | if (r) { |
214 | ret = r->start; | |
215 | goto out; | |
216 | } | |
daaef255 EG |
217 | |
218 | /* | |
219 | * For the index 0 interrupt, allow falling back to GpioInt | |
220 | * resources. While a device could have both Interrupt and GpioInt | |
221 | * resources, making this fallback ambiguous, in many common cases | |
222 | * the device will only expose one IRQ, and this fallback | |
223 | * allows a common code path across either kind of resource. | |
224 | */ | |
46c42d84 | 225 | if (num == 0 && has_acpi_companion(&dev->dev)) { |
71564a26 | 226 | ret = acpi_dev_gpio_irq_get(ACPI_COMPANION(&dev->dev), num); |
46c42d84 BN |
227 | /* Our callers expect -ENXIO for missing IRQs. */ |
228 | if (ret >= 0 || ret == -EPROBE_DEFER) | |
a85a6c86 | 229 | goto out; |
46c42d84 | 230 | } |
daaef255 | 231 | |
5cf8f7db | 232 | #endif |
c99f4ebc AS |
233 | out_not_found: |
234 | ret = -ENXIO; | |
a85a6c86 | 235 | out: |
ce753ad1 SS |
236 | if (WARN(!ret, "0 is an invalid IRQ number\n")) |
237 | return -EINVAL; | |
a85a6c86 | 238 | return ret; |
1da177e4 | 239 | } |
ec4e2906 | 240 | EXPORT_SYMBOL_GPL(platform_get_irq_optional); |
7723f4c5 SB |
241 | |
242 | /** | |
243 | * platform_get_irq - get an IRQ for a device | |
244 | * @dev: platform device | |
245 | * @num: IRQ number index | |
246 | * | |
247 | * Gets an IRQ for a platform device and prints an error message if finding the | |
248 | * IRQ fails. Device drivers should check the return value for errors so as to | |
249 | * not pass a negative integer value to the request_irq() APIs. | |
250 | * | |
f0825246 MCC |
251 | * For example:: |
252 | * | |
7723f4c5 SB |
253 | * int irq = platform_get_irq(pdev, 0); |
254 | * if (irq < 0) | |
255 | * return irq; | |
256 | * | |
a85a6c86 | 257 | * Return: non-zero IRQ number on success, negative error number on failure. |
7723f4c5 SB |
258 | */ |
259 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
260 | { | |
261 | int ret; | |
262 | ||
c2f3f755 | 263 | ret = platform_get_irq_optional(dev, num); |
2043727c CH |
264 | if (ret < 0) |
265 | return dev_err_probe(&dev->dev, ret, | |
266 | "IRQ index %u not found\n", num); | |
7723f4c5 SB |
267 | |
268 | return ret; | |
269 | } | |
a96b2042 | 270 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 | 271 | |
4b83555d SB |
272 | /** |
273 | * platform_irq_count - Count the number of IRQs a platform device uses | |
274 | * @dev: platform device | |
275 | * | |
276 | * Return: Number of IRQs a platform device uses or EPROBE_DEFER | |
277 | */ | |
278 | int platform_irq_count(struct platform_device *dev) | |
279 | { | |
280 | int ret, nr = 0; | |
281 | ||
c2f3f755 | 282 | while ((ret = platform_get_irq_optional(dev, nr)) >= 0) |
4b83555d SB |
283 | nr++; |
284 | ||
285 | if (ret == -EPROBE_DEFER) | |
286 | return ret; | |
287 | ||
288 | return nr; | |
289 | } | |
290 | EXPORT_SYMBOL_GPL(platform_irq_count); | |
291 | ||
e15f2fa9 JG |
292 | struct irq_affinity_devres { |
293 | unsigned int count; | |
294 | unsigned int irq[]; | |
295 | }; | |
296 | ||
297 | static void platform_disable_acpi_irq(struct platform_device *pdev, int index) | |
298 | { | |
299 | struct resource *r; | |
300 | ||
301 | r = platform_get_resource(pdev, IORESOURCE_IRQ, index); | |
302 | if (r) | |
303 | irqresource_disabled(r, 0); | |
304 | } | |
305 | ||
306 | static void devm_platform_get_irqs_affinity_release(struct device *dev, | |
307 | void *res) | |
308 | { | |
309 | struct irq_affinity_devres *ptr = res; | |
310 | int i; | |
311 | ||
312 | for (i = 0; i < ptr->count; i++) { | |
313 | irq_dispose_mapping(ptr->irq[i]); | |
314 | ||
315 | if (has_acpi_companion(dev)) | |
316 | platform_disable_acpi_irq(to_platform_device(dev), i); | |
317 | } | |
318 | } | |
319 | ||
320 | /** | |
321 | * devm_platform_get_irqs_affinity - devm method to get a set of IRQs for a | |
322 | * device using an interrupt affinity descriptor | |
323 | * @dev: platform device pointer | |
324 | * @affd: affinity descriptor | |
325 | * @minvec: minimum count of interrupt vectors | |
326 | * @maxvec: maximum count of interrupt vectors | |
327 | * @irqs: pointer holder for IRQ numbers | |
328 | * | |
329 | * Gets a set of IRQs for a platform device, and updates IRQ afffinty according | |
330 | * to the passed affinity descriptor | |
331 | * | |
332 | * Return: Number of vectors on success, negative error number on failure. | |
333 | */ | |
334 | int devm_platform_get_irqs_affinity(struct platform_device *dev, | |
335 | struct irq_affinity *affd, | |
336 | unsigned int minvec, | |
337 | unsigned int maxvec, | |
338 | int **irqs) | |
339 | { | |
340 | struct irq_affinity_devres *ptr; | |
341 | struct irq_affinity_desc *desc; | |
342 | size_t size; | |
343 | int i, ret, nvec; | |
344 | ||
345 | if (!affd) | |
346 | return -EPERM; | |
347 | ||
348 | if (maxvec < minvec) | |
349 | return -ERANGE; | |
350 | ||
351 | nvec = platform_irq_count(dev); | |
e1dc2099 JG |
352 | if (nvec < 0) |
353 | return nvec; | |
e15f2fa9 JG |
354 | |
355 | if (nvec < minvec) | |
356 | return -ENOSPC; | |
357 | ||
358 | nvec = irq_calc_affinity_vectors(minvec, nvec, affd); | |
359 | if (nvec < minvec) | |
360 | return -ENOSPC; | |
361 | ||
362 | if (nvec > maxvec) | |
363 | nvec = maxvec; | |
364 | ||
365 | size = sizeof(*ptr) + sizeof(unsigned int) * nvec; | |
366 | ptr = devres_alloc(devm_platform_get_irqs_affinity_release, size, | |
367 | GFP_KERNEL); | |
368 | if (!ptr) | |
369 | return -ENOMEM; | |
370 | ||
371 | ptr->count = nvec; | |
372 | ||
373 | for (i = 0; i < nvec; i++) { | |
374 | int irq = platform_get_irq(dev, i); | |
375 | if (irq < 0) { | |
376 | ret = irq; | |
377 | goto err_free_devres; | |
378 | } | |
379 | ptr->irq[i] = irq; | |
380 | } | |
381 | ||
382 | desc = irq_create_affinity_masks(nvec, affd); | |
383 | if (!desc) { | |
384 | ret = -ENOMEM; | |
385 | goto err_free_devres; | |
386 | } | |
387 | ||
388 | for (i = 0; i < nvec; i++) { | |
389 | ret = irq_update_affinity_desc(ptr->irq[i], &desc[i]); | |
390 | if (ret) { | |
391 | dev_err(&dev->dev, "failed to update irq%d affinity descriptor (%d)\n", | |
392 | ptr->irq[i], ret); | |
393 | goto err_free_desc; | |
394 | } | |
395 | } | |
396 | ||
397 | devres_add(&dev->dev, ptr); | |
398 | ||
399 | kfree(desc); | |
400 | ||
401 | *irqs = ptr->irq; | |
402 | ||
403 | return nvec; | |
404 | ||
405 | err_free_desc: | |
406 | kfree(desc); | |
407 | err_free_devres: | |
408 | devres_free(ptr); | |
409 | return ret; | |
410 | } | |
411 | EXPORT_SYMBOL_GPL(devm_platform_get_irqs_affinity); | |
412 | ||
1da177e4 | 413 | /** |
4a3ad20c GKH |
414 | * platform_get_resource_byname - get a resource for a device by name |
415 | * @dev: platform device | |
416 | * @type: resource type | |
417 | * @name: resource name | |
1da177e4 | 418 | */ |
4a3ad20c | 419 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
420 | unsigned int type, |
421 | const char *name) | |
1da177e4 | 422 | { |
39cc539f | 423 | u32 i; |
1da177e4 LT |
424 | |
425 | for (i = 0; i < dev->num_resources; i++) { | |
426 | struct resource *r = &dev->resource[i]; | |
427 | ||
1b8cb929 PU |
428 | if (unlikely(!r->name)) |
429 | continue; | |
430 | ||
c9f66169 MD |
431 | if (type == resource_type(r) && !strcmp(r->name, name)) |
432 | return r; | |
1da177e4 LT |
433 | } |
434 | return NULL; | |
435 | } | |
a96b2042 | 436 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 | 437 | |
f1da567f HG |
438 | static int __platform_get_irq_byname(struct platform_device *dev, |
439 | const char *name) | |
1da177e4 | 440 | { |
ad69674e | 441 | struct resource *r; |
71564a26 | 442 | int ret; |
ad69674e | 443 | |
d4ad017d SJ |
444 | if (!dev->dev.of_node || IS_ENABLED(CONFIG_OF_IRQ)) { |
445 | ret = fwnode_irq_get_byname(dev_fwnode(&dev->dev), name); | |
e330b9a6 | 446 | if (ret > 0 || ret == -EPROBE_DEFER) |
aff008ad GR |
447 | return ret; |
448 | } | |
1da177e4 | 449 | |
ad69674e | 450 | r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name); |
a85a6c86 | 451 | if (r) { |
ce753ad1 SS |
452 | if (WARN(!r->start, "0 is an invalid IRQ number\n")) |
453 | return -EINVAL; | |
7723f4c5 | 454 | return r->start; |
a85a6c86 | 455 | } |
7723f4c5 | 456 | |
7723f4c5 | 457 | return -ENXIO; |
1da177e4 | 458 | } |
f1da567f HG |
459 | |
460 | /** | |
461 | * platform_get_irq_byname - get an IRQ for a device by name | |
462 | * @dev: platform device | |
463 | * @name: IRQ name | |
464 | * | |
465 | * Get an IRQ like platform_get_irq(), but then by name rather then by index. | |
466 | * | |
a85a6c86 | 467 | * Return: non-zero IRQ number on success, negative error number on failure. |
f1da567f HG |
468 | */ |
469 | int platform_get_irq_byname(struct platform_device *dev, const char *name) | |
470 | { | |
471 | int ret; | |
472 | ||
473 | ret = __platform_get_irq_byname(dev, name); | |
27446562 SS |
474 | if (ret < 0) |
475 | return dev_err_probe(&dev->dev, ret, "IRQ %s not found\n", | |
476 | name); | |
f1da567f HG |
477 | return ret; |
478 | } | |
a96b2042 | 479 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 | 480 | |
f1da567f HG |
481 | /** |
482 | * platform_get_irq_byname_optional - get an optional IRQ for a device by name | |
483 | * @dev: platform device | |
484 | * @name: IRQ name | |
485 | * | |
486 | * Get an optional IRQ by name like platform_get_irq_byname(). Except that it | |
487 | * does not print an error message if an IRQ can not be obtained. | |
488 | * | |
a85a6c86 | 489 | * Return: non-zero IRQ number on success, negative error number on failure. |
f1da567f HG |
490 | */ |
491 | int platform_get_irq_byname_optional(struct platform_device *dev, | |
492 | const char *name) | |
493 | { | |
494 | return __platform_get_irq_byname(dev, name); | |
495 | } | |
496 | EXPORT_SYMBOL_GPL(platform_get_irq_byname_optional); | |
497 | ||
1da177e4 | 498 | /** |
4a3ad20c GKH |
499 | * platform_add_devices - add a numbers of platform devices |
500 | * @devs: array of platform devices to add | |
501 | * @num: number of platform devices in array | |
1da177e4 LT |
502 | */ |
503 | int platform_add_devices(struct platform_device **devs, int num) | |
504 | { | |
505 | int i, ret = 0; | |
506 | ||
507 | for (i = 0; i < num; i++) { | |
508 | ret = platform_device_register(devs[i]); | |
509 | if (ret) { | |
510 | while (--i >= 0) | |
511 | platform_device_unregister(devs[i]); | |
512 | break; | |
513 | } | |
514 | } | |
515 | ||
516 | return ret; | |
517 | } | |
a96b2042 | 518 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 519 | |
37c12e74 RK |
520 | struct platform_object { |
521 | struct platform_device pdev; | |
1cec24c5 | 522 | char name[]; |
37c12e74 RK |
523 | }; |
524 | ||
cdfee562 CH |
525 | /* |
526 | * Set up default DMA mask for platform devices if the they weren't | |
527 | * previously set by the architecture / DT. | |
528 | */ | |
529 | static void setup_pdev_dma_masks(struct platform_device *pdev) | |
530 | { | |
9495b7e9 UH |
531 | pdev->dev.dma_parms = &pdev->dma_parms; |
532 | ||
cdfee562 CH |
533 | if (!pdev->dev.coherent_dma_mask) |
534 | pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); | |
e3a36eb6 CH |
535 | if (!pdev->dev.dma_mask) { |
536 | pdev->platform_dma_mask = DMA_BIT_MASK(32); | |
537 | pdev->dev.dma_mask = &pdev->platform_dma_mask; | |
538 | } | |
cdfee562 CH |
539 | }; |
540 | ||
1da177e4 | 541 | /** |
3c31f07a | 542 | * platform_device_put - destroy a platform device |
4a3ad20c | 543 | * @pdev: platform device to free |
37c12e74 | 544 | * |
4a3ad20c GKH |
545 | * Free all memory associated with a platform device. This function must |
546 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
547 | */ |
548 | void platform_device_put(struct platform_device *pdev) | |
549 | { | |
99fef587 | 550 | if (!IS_ERR_OR_NULL(pdev)) |
37c12e74 RK |
551 | put_device(&pdev->dev); |
552 | } | |
553 | EXPORT_SYMBOL_GPL(platform_device_put); | |
554 | ||
555 | static void platform_device_release(struct device *dev) | |
556 | { | |
4a3ad20c GKH |
557 | struct platform_object *pa = container_of(dev, struct platform_object, |
558 | pdev.dev); | |
37c12e74 | 559 | |
cb8be8b4 | 560 | of_node_put(pa->pdev.dev.of_node); |
37c12e74 | 561 | kfree(pa->pdev.dev.platform_data); |
e710d7d5 | 562 | kfree(pa->pdev.mfd_cell); |
37c12e74 | 563 | kfree(pa->pdev.resource); |
3d713e0e | 564 | kfree(pa->pdev.driver_override); |
37c12e74 RK |
565 | kfree(pa); |
566 | } | |
567 | ||
568 | /** | |
3c31f07a | 569 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
570 | * @name: base name of the device we're adding |
571 | * @id: instance id | |
37c12e74 | 572 | * |
4a3ad20c GKH |
573 | * Create a platform device object which can have other objects attached |
574 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 575 | */ |
1359555e | 576 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
577 | { |
578 | struct platform_object *pa; | |
579 | ||
1cec24c5 | 580 | pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL); |
37c12e74 RK |
581 | if (pa) { |
582 | strcpy(pa->name, name); | |
583 | pa->pdev.name = pa->name; | |
584 | pa->pdev.id = id; | |
585 | device_initialize(&pa->pdev.dev); | |
586 | pa->pdev.dev.release = platform_device_release; | |
cdfee562 | 587 | setup_pdev_dma_masks(&pa->pdev); |
37c12e74 RK |
588 | } |
589 | ||
93ce3061 | 590 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
591 | } |
592 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
593 | ||
594 | /** | |
3c31f07a | 595 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
596 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
597 | * @res: set of resources that needs to be allocated for the device | |
598 | * @num: number of resources | |
37c12e74 | 599 | * |
4a3ad20c GKH |
600 | * Add a copy of the resources to the platform device. The memory |
601 | * associated with the resources will be freed when the platform device is | |
602 | * released. | |
37c12e74 | 603 | */ |
4a3ad20c | 604 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 605 | const struct resource *res, unsigned int num) |
37c12e74 | 606 | { |
cea89623 | 607 | struct resource *r = NULL; |
37c12e74 | 608 | |
cea89623 UKK |
609 | if (res) { |
610 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); | |
611 | if (!r) | |
612 | return -ENOMEM; | |
37c12e74 | 613 | } |
cea89623 | 614 | |
4a03d6f7 | 615 | kfree(pdev->resource); |
cea89623 UKK |
616 | pdev->resource = r; |
617 | pdev->num_resources = num; | |
618 | return 0; | |
37c12e74 RK |
619 | } |
620 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
621 | ||
622 | /** | |
3c31f07a | 623 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
624 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
625 | * @data: platform specific data for this platform device | |
626 | * @size: size of platform specific data | |
37c12e74 | 627 | * |
4a3ad20c GKH |
628 | * Add a copy of platform specific data to the platform device's |
629 | * platform_data pointer. The memory associated with the platform data | |
630 | * will be freed when the platform device is released. | |
37c12e74 | 631 | */ |
4a3ad20c GKH |
632 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
633 | size_t size) | |
37c12e74 | 634 | { |
27a33f9e | 635 | void *d = NULL; |
5cfc64ce | 636 | |
27a33f9e UKK |
637 | if (data) { |
638 | d = kmemdup(data, size, GFP_KERNEL); | |
639 | if (!d) | |
640 | return -ENOMEM; | |
37c12e74 | 641 | } |
27a33f9e | 642 | |
251e031d | 643 | kfree(pdev->dev.platform_data); |
27a33f9e UKK |
644 | pdev->dev.platform_data = d; |
645 | return 0; | |
37c12e74 RK |
646 | } |
647 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
648 | ||
649 | /** | |
4a3ad20c GKH |
650 | * platform_device_add - add a platform device to device hierarchy |
651 | * @pdev: platform device we're adding | |
1da177e4 | 652 | * |
4a3ad20c GKH |
653 | * This is part 2 of platform_device_register(), though may be called |
654 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 655 | */ |
37c12e74 | 656 | int platform_device_add(struct platform_device *pdev) |
1da177e4 | 657 | { |
39cc539f SS |
658 | u32 i; |
659 | int ret; | |
1da177e4 LT |
660 | |
661 | if (!pdev) | |
662 | return -EINVAL; | |
663 | ||
664 | if (!pdev->dev.parent) | |
665 | pdev->dev.parent = &platform_bus; | |
666 | ||
667 | pdev->dev.bus = &platform_bus_type; | |
668 | ||
689ae231 JD |
669 | switch (pdev->id) { |
670 | default: | |
1e0b2cf9 | 671 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
689ae231 JD |
672 | break; |
673 | case PLATFORM_DEVID_NONE: | |
acc0e90f | 674 | dev_set_name(&pdev->dev, "%s", pdev->name); |
689ae231 JD |
675 | break; |
676 | case PLATFORM_DEVID_AUTO: | |
677 | /* | |
678 | * Automatically allocated device ID. We mark it as such so | |
679 | * that we remember it must be freed, and we append a suffix | |
680 | * to avoid namespace collision with explicit IDs. | |
681 | */ | |
0de75116 | 682 | ret = ida_alloc(&platform_devid_ida, GFP_KERNEL); |
689ae231 | 683 | if (ret < 0) |
5da7f709 | 684 | goto err_out; |
689ae231 JD |
685 | pdev->id = ret; |
686 | pdev->id_auto = true; | |
687 | dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); | |
688 | break; | |
689 | } | |
1da177e4 LT |
690 | |
691 | for (i = 0; i < pdev->num_resources; i++) { | |
5da7f709 | 692 | struct resource *p, *r = &pdev->resource[i]; |
1da177e4 LT |
693 | |
694 | if (r->name == NULL) | |
1e0b2cf9 | 695 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
696 | |
697 | p = r->parent; | |
698 | if (!p) { | |
0e6c861f | 699 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 700 | p = &iomem_resource; |
0e6c861f | 701 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
702 | p = &ioport_resource; |
703 | } | |
704 | ||
25ebcb7d AS |
705 | if (p) { |
706 | ret = insert_resource(p, r); | |
707 | if (ret) { | |
708 | dev_err(&pdev->dev, "failed to claim resource %d: %pR\n", i, r); | |
709 | goto failed; | |
710 | } | |
5da7f709 | 711 | } |
1da177e4 LT |
712 | } |
713 | ||
714 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 715 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 716 | |
e3915532 | 717 | ret = device_add(&pdev->dev); |
8b2dceba GKH |
718 | if (ret == 0) |
719 | return ret; | |
720 | ||
5da7f709 | 721 | failed: |
8b2dceba | 722 | if (pdev->id_auto) { |
0de75116 | 723 | ida_free(&platform_devid_ida, pdev->id); |
8b2dceba GKH |
724 | pdev->id = PLATFORM_DEVID_AUTO; |
725 | } | |
726 | ||
0707cfa5 | 727 | while (i--) { |
8b2dceba | 728 | struct resource *r = &pdev->resource[i]; |
7f5dcaf1 | 729 | if (r->parent) |
8b2dceba GKH |
730 | release_resource(r); |
731 | } | |
c9f66169 | 732 | |
5da7f709 | 733 | err_out: |
1da177e4 LT |
734 | return ret; |
735 | } | |
37c12e74 RK |
736 | EXPORT_SYMBOL_GPL(platform_device_add); |
737 | ||
738 | /** | |
4a3ad20c GKH |
739 | * platform_device_del - remove a platform-level device |
740 | * @pdev: platform device we're removing | |
1da177e4 | 741 | * |
4a3ad20c GKH |
742 | * Note that this function will also release all memory- and port-based |
743 | * resources owned by the device (@dev->resource). This function must | |
744 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 745 | */ |
93ce3061 | 746 | void platform_device_del(struct platform_device *pdev) |
1da177e4 | 747 | { |
39cc539f | 748 | u32 i; |
c9f66169 | 749 | |
99fef587 | 750 | if (!IS_ERR_OR_NULL(pdev)) { |
8b2dceba GKH |
751 | device_del(&pdev->dev); |
752 | ||
753 | if (pdev->id_auto) { | |
0de75116 | 754 | ida_free(&platform_devid_ida, pdev->id); |
8b2dceba GKH |
755 | pdev->id = PLATFORM_DEVID_AUTO; |
756 | } | |
757 | ||
758 | for (i = 0; i < pdev->num_resources; i++) { | |
759 | struct resource *r = &pdev->resource[i]; | |
7f5dcaf1 | 760 | if (r->parent) |
8b2dceba GKH |
761 | release_resource(r); |
762 | } | |
763 | } | |
1da177e4 | 764 | } |
93ce3061 DT |
765 | EXPORT_SYMBOL_GPL(platform_device_del); |
766 | ||
767 | /** | |
4a3ad20c GKH |
768 | * platform_device_register - add a platform-level device |
769 | * @pdev: platform device we're adding | |
67e532a4 JH |
770 | * |
771 | * NOTE: _Never_ directly free @pdev after calling this function, even if it | |
772 | * returned an error! Always use platform_device_put() to give up the | |
773 | * reference initialised in this function instead. | |
93ce3061 | 774 | */ |
4a3ad20c | 775 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
776 | { |
777 | device_initialize(&pdev->dev); | |
cdfee562 | 778 | setup_pdev_dma_masks(pdev); |
93ce3061 DT |
779 | return platform_device_add(pdev); |
780 | } | |
a96b2042 | 781 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
782 | |
783 | /** | |
4a3ad20c GKH |
784 | * platform_device_unregister - unregister a platform-level device |
785 | * @pdev: platform device we're unregistering | |
93ce3061 | 786 | * |
4a3ad20c GKH |
787 | * Unregistration is done in 2 steps. First we release all resources |
788 | * and remove it from the subsystem, then we drop reference count by | |
789 | * calling platform_device_put(). | |
93ce3061 | 790 | */ |
4a3ad20c | 791 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
792 | { |
793 | platform_device_del(pdev); | |
794 | platform_device_put(pdev); | |
795 | } | |
a96b2042 | 796 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 797 | |
1da177e4 | 798 | /** |
01dcc60a | 799 | * platform_device_register_full - add a platform-level device with |
44f28bde | 800 | * resources and platform-specific data |
49a4ec18 | 801 | * |
01dcc60a | 802 | * @pdevinfo: data used to create device |
d8bf2540 | 803 | * |
f0eae0ed | 804 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 805 | */ |
01dcc60a | 806 | struct platform_device *platform_device_register_full( |
5a3072be | 807 | const struct platform_device_info *pdevinfo) |
d8bf2540 | 808 | { |
45bb08de | 809 | int ret; |
d8bf2540 | 810 | struct platform_device *pdev; |
d8bf2540 | 811 | |
01dcc60a | 812 | pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
44f28bde | 813 | if (!pdev) |
36cf3b13 | 814 | return ERR_PTR(-ENOMEM); |
01dcc60a UKK |
815 | |
816 | pdev->dev.parent = pdevinfo->parent; | |
ce793486 | 817 | pdev->dev.fwnode = pdevinfo->fwnode; |
2c1ea6ab MR |
818 | pdev->dev.of_node = of_node_get(to_of_node(pdev->dev.fwnode)); |
819 | pdev->dev.of_node_reused = pdevinfo->of_node_reused; | |
01dcc60a UKK |
820 | |
821 | if (pdevinfo->dma_mask) { | |
e3a36eb6 CH |
822 | pdev->platform_dma_mask = pdevinfo->dma_mask; |
823 | pdev->dev.dma_mask = &pdev->platform_dma_mask; | |
01dcc60a UKK |
824 | pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; |
825 | } | |
d8bf2540 | 826 | |
01dcc60a UKK |
827 | ret = platform_device_add_resources(pdev, |
828 | pdevinfo->res, pdevinfo->num_res); | |
807508c8 AV |
829 | if (ret) |
830 | goto err; | |
44f28bde | 831 | |
01dcc60a UKK |
832 | ret = platform_device_add_data(pdev, |
833 | pdevinfo->data, pdevinfo->size_data); | |
807508c8 AV |
834 | if (ret) |
835 | goto err; | |
d8bf2540 | 836 | |
f4d05266 | 837 | if (pdevinfo->properties) { |
bd1e336a HK |
838 | ret = device_create_managed_software_node(&pdev->dev, |
839 | pdevinfo->properties, NULL); | |
00bbc1d8 MW |
840 | if (ret) |
841 | goto err; | |
842 | } | |
843 | ||
44f28bde UKK |
844 | ret = platform_device_add(pdev); |
845 | if (ret) { | |
846 | err: | |
7b199811 | 847 | ACPI_COMPANION_SET(&pdev->dev, NULL); |
44f28bde UKK |
848 | platform_device_put(pdev); |
849 | return ERR_PTR(ret); | |
850 | } | |
d8bf2540 DB |
851 | |
852 | return pdev; | |
d8bf2540 | 853 | } |
01dcc60a | 854 | EXPORT_SYMBOL_GPL(platform_device_register_full); |
d8bf2540 | 855 | |
00d3dcdd | 856 | /** |
9447057e | 857 | * __platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 858 | * @drv: platform driver structure |
08801f96 | 859 | * @owner: owning module/driver |
00d3dcdd | 860 | */ |
9447057e LC |
861 | int __platform_driver_register(struct platform_driver *drv, |
862 | struct module *owner) | |
00d3dcdd | 863 | { |
9447057e | 864 | drv->driver.owner = owner; |
00d3dcdd | 865 | drv->driver.bus = &platform_bus_type; |
783ea7d4 | 866 | |
00d3dcdd RK |
867 | return driver_register(&drv->driver); |
868 | } | |
9447057e | 869 | EXPORT_SYMBOL_GPL(__platform_driver_register); |
00d3dcdd RK |
870 | |
871 | /** | |
3c31f07a | 872 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 873 | * @drv: platform driver structure |
00d3dcdd RK |
874 | */ |
875 | void platform_driver_unregister(struct platform_driver *drv) | |
876 | { | |
877 | driver_unregister(&drv->driver); | |
878 | } | |
879 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
880 | ||
16085668 | 881 | static int platform_probe_fail(struct platform_device *pdev) |
e21d740a UKK |
882 | { |
883 | return -ENXIO; | |
884 | } | |
885 | ||
c67334fb | 886 | /** |
c3b50dc2 | 887 | * __platform_driver_probe - register driver for non-hotpluggable device |
c67334fb | 888 | * @drv: platform driver structure |
3f9120b0 | 889 | * @probe: the driver probe routine, probably from an __init section |
c3b50dc2 | 890 | * @module: module which will be the owner of the driver |
c67334fb DB |
891 | * |
892 | * Use this instead of platform_driver_register() when you know the device | |
893 | * is not hotpluggable and has already been registered, and you want to | |
894 | * remove its run-once probe() infrastructure from memory after the driver | |
895 | * has bound to the device. | |
896 | * | |
897 | * One typical use for this would be with drivers for controllers integrated | |
898 | * into system-on-chip processors, where the controller devices have been | |
899 | * configured as part of board setup. | |
900 | * | |
3f9120b0 | 901 | * Note that this is incompatible with deferred probing. |
647c86d0 | 902 | * |
c67334fb DB |
903 | * Returns zero if the driver registered and bound to a device, else returns |
904 | * a negative error code and with the driver not registered. | |
905 | */ | |
c3b50dc2 WS |
906 | int __init_or_module __platform_driver_probe(struct platform_driver *drv, |
907 | int (*probe)(struct platform_device *), struct module *module) | |
c67334fb DB |
908 | { |
909 | int retval, code; | |
910 | ||
5c36eb2a DT |
911 | if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) { |
912 | pr_err("%s: drivers registered with %s can not be probed asynchronously\n", | |
913 | drv->driver.name, __func__); | |
914 | return -EINVAL; | |
915 | } | |
916 | ||
917 | /* | |
918 | * We have to run our probes synchronously because we check if | |
919 | * we find any devices to bind to and exit with error if there | |
920 | * are any. | |
921 | */ | |
922 | drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS; | |
923 | ||
3f9120b0 JH |
924 | /* |
925 | * Prevent driver from requesting probe deferral to avoid further | |
926 | * futile probe attempts. | |
927 | */ | |
928 | drv->prevent_deferred_probe = true; | |
929 | ||
1a6f2a75 DT |
930 | /* make sure driver won't have bind/unbind attributes */ |
931 | drv->driver.suppress_bind_attrs = true; | |
932 | ||
c67334fb DB |
933 | /* temporary section violation during probe() */ |
934 | drv->probe = probe; | |
c3b50dc2 | 935 | retval = code = __platform_driver_register(drv, module); |
388bcc6e KS |
936 | if (retval) |
937 | return retval; | |
c67334fb | 938 | |
1a6f2a75 DT |
939 | /* |
940 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
941 | * the list of drivers in order to probe new devices. Check to see |
942 | * if the probe was successful, and make sure any forced probes of | |
943 | * new devices fail. | |
944 | */ | |
d79d3244 | 945 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
16085668 | 946 | drv->probe = platform_probe_fail; |
e5dd1278 | 947 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb | 948 | retval = -ENODEV; |
d79d3244 | 949 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
950 | |
951 | if (code != retval) | |
952 | platform_driver_unregister(drv); | |
953 | return retval; | |
954 | } | |
c3b50dc2 | 955 | EXPORT_SYMBOL_GPL(__platform_driver_probe); |
1da177e4 | 956 | |
ecdf6ceb | 957 | /** |
291f653a | 958 | * __platform_create_bundle - register driver and create corresponding device |
ecdf6ceb DT |
959 | * @driver: platform driver structure |
960 | * @probe: the driver probe routine, probably from an __init section | |
961 | * @res: set of resources that needs to be allocated for the device | |
962 | * @n_res: number of resources | |
963 | * @data: platform specific data for this platform device | |
964 | * @size: size of platform specific data | |
291f653a | 965 | * @module: module which will be the owner of the driver |
ecdf6ceb DT |
966 | * |
967 | * Use this in legacy-style modules that probe hardware directly and | |
968 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
969 | * |
970 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb | 971 | */ |
291f653a | 972 | struct platform_device * __init_or_module __platform_create_bundle( |
ecdf6ceb DT |
973 | struct platform_driver *driver, |
974 | int (*probe)(struct platform_device *), | |
975 | struct resource *res, unsigned int n_res, | |
291f653a | 976 | const void *data, size_t size, struct module *module) |
ecdf6ceb DT |
977 | { |
978 | struct platform_device *pdev; | |
979 | int error; | |
980 | ||
981 | pdev = platform_device_alloc(driver->driver.name, -1); | |
982 | if (!pdev) { | |
983 | error = -ENOMEM; | |
984 | goto err_out; | |
985 | } | |
986 | ||
807508c8 AV |
987 | error = platform_device_add_resources(pdev, res, n_res); |
988 | if (error) | |
989 | goto err_pdev_put; | |
ecdf6ceb | 990 | |
807508c8 AV |
991 | error = platform_device_add_data(pdev, data, size); |
992 | if (error) | |
993 | goto err_pdev_put; | |
ecdf6ceb DT |
994 | |
995 | error = platform_device_add(pdev); | |
996 | if (error) | |
997 | goto err_pdev_put; | |
998 | ||
291f653a | 999 | error = __platform_driver_probe(driver, probe, module); |
ecdf6ceb DT |
1000 | if (error) |
1001 | goto err_pdev_del; | |
1002 | ||
1003 | return pdev; | |
1004 | ||
1005 | err_pdev_del: | |
1006 | platform_device_del(pdev); | |
1007 | err_pdev_put: | |
1008 | platform_device_put(pdev); | |
1009 | err_out: | |
1010 | return ERR_PTR(error); | |
1011 | } | |
291f653a | 1012 | EXPORT_SYMBOL_GPL(__platform_create_bundle); |
ecdf6ceb | 1013 | |
dbe2256d TR |
1014 | /** |
1015 | * __platform_register_drivers - register an array of platform drivers | |
1016 | * @drivers: an array of drivers to register | |
1017 | * @count: the number of drivers to register | |
1018 | * @owner: module owning the drivers | |
1019 | * | |
1020 | * Registers platform drivers specified by an array. On failure to register a | |
1021 | * driver, all previously registered drivers will be unregistered. Callers of | |
1022 | * this API should use platform_unregister_drivers() to unregister drivers in | |
1023 | * the reverse order. | |
1024 | * | |
1025 | * Returns: 0 on success or a negative error code on failure. | |
1026 | */ | |
1027 | int __platform_register_drivers(struct platform_driver * const *drivers, | |
1028 | unsigned int count, struct module *owner) | |
1029 | { | |
1030 | unsigned int i; | |
1031 | int err; | |
1032 | ||
1033 | for (i = 0; i < count; i++) { | |
1034 | pr_debug("registering platform driver %ps\n", drivers[i]); | |
1035 | ||
1036 | err = __platform_driver_register(drivers[i], owner); | |
1037 | if (err < 0) { | |
1038 | pr_err("failed to register platform driver %ps: %d\n", | |
1039 | drivers[i], err); | |
1040 | goto error; | |
1041 | } | |
1042 | } | |
1043 | ||
1044 | return 0; | |
1045 | ||
1046 | error: | |
1047 | while (i--) { | |
1048 | pr_debug("unregistering platform driver %ps\n", drivers[i]); | |
1049 | platform_driver_unregister(drivers[i]); | |
1050 | } | |
1051 | ||
1052 | return err; | |
1053 | } | |
1054 | EXPORT_SYMBOL_GPL(__platform_register_drivers); | |
1055 | ||
1056 | /** | |
1057 | * platform_unregister_drivers - unregister an array of platform drivers | |
1058 | * @drivers: an array of drivers to unregister | |
1059 | * @count: the number of drivers to unregister | |
1060 | * | |
c82c83c3 | 1061 | * Unregisters platform drivers specified by an array. This is typically used |
dbe2256d TR |
1062 | * to complement an earlier call to platform_register_drivers(). Drivers are |
1063 | * unregistered in the reverse order in which they were registered. | |
1064 | */ | |
1065 | void platform_unregister_drivers(struct platform_driver * const *drivers, | |
1066 | unsigned int count) | |
1067 | { | |
1068 | while (count--) { | |
1069 | pr_debug("unregistering platform driver %ps\n", drivers[count]); | |
1070 | platform_driver_unregister(drivers[count]); | |
1071 | } | |
1072 | } | |
1073 | EXPORT_SYMBOL_GPL(platform_unregister_drivers); | |
1074 | ||
57fee4a5 | 1075 | static const struct platform_device_id *platform_match_id( |
831fad2f | 1076 | const struct platform_device_id *id, |
57fee4a5 EM |
1077 | struct platform_device *pdev) |
1078 | { | |
1079 | while (id->name[0]) { | |
391c0325 | 1080 | if (strcmp(pdev->name, id->name) == 0) { |
57fee4a5 EM |
1081 | pdev->id_entry = id; |
1082 | return id; | |
1083 | } | |
1084 | id++; | |
1085 | } | |
1086 | return NULL; | |
1087 | } | |
1088 | ||
25e18499 RW |
1089 | #ifdef CONFIG_PM_SLEEP |
1090 | ||
1091 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 1092 | { |
783ea7d4 MD |
1093 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
1094 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
1095 | int ret = 0; |
1096 | ||
783ea7d4 MD |
1097 | if (dev->driver && pdrv->suspend) |
1098 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
1099 | |
1100 | return ret; | |
1101 | } | |
1102 | ||
25e18499 | 1103 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 1104 | { |
783ea7d4 MD |
1105 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
1106 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
1107 | int ret = 0; |
1108 | ||
783ea7d4 MD |
1109 | if (dev->driver && pdrv->resume) |
1110 | ret = pdrv->resume(pdev); | |
9480e307 | 1111 | |
1da177e4 LT |
1112 | return ret; |
1113 | } | |
1114 | ||
69c9dd1e | 1115 | #endif /* CONFIG_PM_SLEEP */ |
9d730229 | 1116 | |
25e18499 RW |
1117 | #ifdef CONFIG_SUSPEND |
1118 | ||
69c9dd1e | 1119 | int platform_pm_suspend(struct device *dev) |
25e18499 RW |
1120 | { |
1121 | struct device_driver *drv = dev->driver; | |
1122 | int ret = 0; | |
1123 | ||
adf09493 RW |
1124 | if (!drv) |
1125 | return 0; | |
1126 | ||
1127 | if (drv->pm) { | |
25e18499 RW |
1128 | if (drv->pm->suspend) |
1129 | ret = drv->pm->suspend(dev); | |
1130 | } else { | |
1131 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
1132 | } | |
1133 | ||
1134 | return ret; | |
1135 | } | |
1136 | ||
69c9dd1e | 1137 | int platform_pm_resume(struct device *dev) |
25e18499 RW |
1138 | { |
1139 | struct device_driver *drv = dev->driver; | |
1140 | int ret = 0; | |
1141 | ||
adf09493 RW |
1142 | if (!drv) |
1143 | return 0; | |
1144 | ||
1145 | if (drv->pm) { | |
25e18499 RW |
1146 | if (drv->pm->resume) |
1147 | ret = drv->pm->resume(dev); | |
1148 | } else { | |
1149 | ret = platform_legacy_resume(dev); | |
1150 | } | |
1151 | ||
1152 | return ret; | |
1153 | } | |
1154 | ||
69c9dd1e | 1155 | #endif /* CONFIG_SUSPEND */ |
25e18499 | 1156 | |
1f112cee | 1157 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 | 1158 | |
69c9dd1e | 1159 | int platform_pm_freeze(struct device *dev) |
25e18499 RW |
1160 | { |
1161 | struct device_driver *drv = dev->driver; | |
1162 | int ret = 0; | |
1163 | ||
1164 | if (!drv) | |
1165 | return 0; | |
1166 | ||
1167 | if (drv->pm) { | |
1168 | if (drv->pm->freeze) | |
1169 | ret = drv->pm->freeze(dev); | |
1170 | } else { | |
1171 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
1172 | } | |
1173 | ||
1174 | return ret; | |
1175 | } | |
1176 | ||
69c9dd1e | 1177 | int platform_pm_thaw(struct device *dev) |
25e18499 RW |
1178 | { |
1179 | struct device_driver *drv = dev->driver; | |
1180 | int ret = 0; | |
1181 | ||
adf09493 RW |
1182 | if (!drv) |
1183 | return 0; | |
1184 | ||
1185 | if (drv->pm) { | |
25e18499 RW |
1186 | if (drv->pm->thaw) |
1187 | ret = drv->pm->thaw(dev); | |
1188 | } else { | |
1189 | ret = platform_legacy_resume(dev); | |
1190 | } | |
1191 | ||
1192 | return ret; | |
1193 | } | |
1194 | ||
69c9dd1e | 1195 | int platform_pm_poweroff(struct device *dev) |
25e18499 RW |
1196 | { |
1197 | struct device_driver *drv = dev->driver; | |
1198 | int ret = 0; | |
1199 | ||
adf09493 RW |
1200 | if (!drv) |
1201 | return 0; | |
1202 | ||
1203 | if (drv->pm) { | |
25e18499 RW |
1204 | if (drv->pm->poweroff) |
1205 | ret = drv->pm->poweroff(dev); | |
1206 | } else { | |
1207 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
1208 | } | |
1209 | ||
1210 | return ret; | |
1211 | } | |
1212 | ||
69c9dd1e | 1213 | int platform_pm_restore(struct device *dev) |
25e18499 RW |
1214 | { |
1215 | struct device_driver *drv = dev->driver; | |
1216 | int ret = 0; | |
1217 | ||
adf09493 RW |
1218 | if (!drv) |
1219 | return 0; | |
1220 | ||
1221 | if (drv->pm) { | |
25e18499 RW |
1222 | if (drv->pm->restore) |
1223 | ret = drv->pm->restore(dev); | |
1224 | } else { | |
1225 | ret = platform_legacy_resume(dev); | |
1226 | } | |
1227 | ||
1228 | return ret; | |
1229 | } | |
1230 | ||
69c9dd1e | 1231 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 1232 | |
e21d740a UKK |
1233 | /* modalias support enables more hands-off userspace setup: |
1234 | * (a) environment variable lets new-style hotplug events work once system is | |
1235 | * fully running: "modprobe $MODALIAS" | |
1236 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
1237 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
1238 | */ | |
1239 | static ssize_t modalias_show(struct device *dev, | |
1240 | struct device_attribute *attr, char *buf) | |
1241 | { | |
1242 | struct platform_device *pdev = to_platform_device(dev); | |
1243 | int len; | |
1244 | ||
1245 | len = of_device_modalias(dev, buf, PAGE_SIZE); | |
1246 | if (len != -ENODEV) | |
1247 | return len; | |
1248 | ||
1249 | len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1); | |
1250 | if (len != -ENODEV) | |
1251 | return len; | |
1252 | ||
1253 | return sysfs_emit(buf, "platform:%s\n", pdev->name); | |
1254 | } | |
1255 | static DEVICE_ATTR_RO(modalias); | |
1256 | ||
1257 | static ssize_t numa_node_show(struct device *dev, | |
1258 | struct device_attribute *attr, char *buf) | |
1259 | { | |
1260 | return sysfs_emit(buf, "%d\n", dev_to_node(dev)); | |
1261 | } | |
1262 | static DEVICE_ATTR_RO(numa_node); | |
1263 | ||
1264 | static ssize_t driver_override_show(struct device *dev, | |
1265 | struct device_attribute *attr, char *buf) | |
1266 | { | |
1267 | struct platform_device *pdev = to_platform_device(dev); | |
1268 | ssize_t len; | |
1269 | ||
1270 | device_lock(dev); | |
1271 | len = sysfs_emit(buf, "%s\n", pdev->driver_override); | |
1272 | device_unlock(dev); | |
1273 | ||
1274 | return len; | |
1275 | } | |
1276 | ||
1277 | static ssize_t driver_override_store(struct device *dev, | |
1278 | struct device_attribute *attr, | |
1279 | const char *buf, size_t count) | |
1280 | { | |
1281 | struct platform_device *pdev = to_platform_device(dev); | |
6c2f4211 | 1282 | int ret; |
e21d740a | 1283 | |
6c2f4211 KK |
1284 | ret = driver_set_override(dev, &pdev->driver_override, buf, count); |
1285 | if (ret) | |
1286 | return ret; | |
e21d740a UKK |
1287 | |
1288 | return count; | |
1289 | } | |
1290 | static DEVICE_ATTR_RW(driver_override); | |
1291 | ||
1292 | static struct attribute *platform_dev_attrs[] = { | |
1293 | &dev_attr_modalias.attr, | |
1294 | &dev_attr_numa_node.attr, | |
1295 | &dev_attr_driver_override.attr, | |
1296 | NULL, | |
1297 | }; | |
1298 | ||
1299 | static umode_t platform_dev_attrs_visible(struct kobject *kobj, struct attribute *a, | |
1300 | int n) | |
1301 | { | |
1302 | struct device *dev = container_of(kobj, typeof(*dev), kobj); | |
1303 | ||
1304 | if (a == &dev_attr_numa_node.attr && | |
1305 | dev_to_node(dev) == NUMA_NO_NODE) | |
1306 | return 0; | |
1307 | ||
1308 | return a->mode; | |
1309 | } | |
1310 | ||
5a576764 | 1311 | static const struct attribute_group platform_dev_group = { |
e21d740a UKK |
1312 | .attrs = platform_dev_attrs, |
1313 | .is_visible = platform_dev_attrs_visible, | |
1314 | }; | |
1315 | __ATTRIBUTE_GROUPS(platform_dev); | |
1316 | ||
1317 | ||
1318 | /** | |
1319 | * platform_match - bind platform device to platform driver. | |
1320 | * @dev: device. | |
1321 | * @drv: driver. | |
1322 | * | |
1323 | * Platform device IDs are assumed to be encoded like this: | |
1324 | * "<name><instance>", where <name> is a short description of the type of | |
1325 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
1326 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
1327 | * "<name>". So, extract the <name> from the platform_device structure, | |
1328 | * and compare it against the name of the driver. Return whether they match | |
1329 | * or not. | |
1330 | */ | |
1331 | static int platform_match(struct device *dev, struct device_driver *drv) | |
1332 | { | |
1333 | struct platform_device *pdev = to_platform_device(dev); | |
1334 | struct platform_driver *pdrv = to_platform_driver(drv); | |
1335 | ||
1336 | /* When driver_override is set, only bind to the matching driver */ | |
1337 | if (pdev->driver_override) | |
1338 | return !strcmp(pdev->driver_override, drv->name); | |
1339 | ||
1340 | /* Attempt an OF style match first */ | |
1341 | if (of_driver_match_device(dev, drv)) | |
1342 | return 1; | |
1343 | ||
1344 | /* Then try ACPI style match */ | |
1345 | if (acpi_driver_match_device(dev, drv)) | |
1346 | return 1; | |
1347 | ||
1348 | /* Then try to match against the id table */ | |
1349 | if (pdrv->id_table) | |
1350 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1351 | ||
1352 | /* fall-back to driver name match */ | |
1353 | return (strcmp(pdev->name, drv->name) == 0); | |
1354 | } | |
1355 | ||
1356 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) | |
1357 | { | |
1358 | struct platform_device *pdev = to_platform_device(dev); | |
1359 | int rc; | |
1360 | ||
1361 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
1362 | rc = of_device_uevent_modalias(dev, env); | |
1363 | if (rc != -ENODEV) | |
1364 | return rc; | |
1365 | ||
1366 | rc = acpi_device_uevent_modalias(dev, env); | |
1367 | if (rc != -ENODEV) | |
1368 | return rc; | |
1369 | ||
1370 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, | |
1371 | pdev->name); | |
1372 | return 0; | |
1373 | } | |
1374 | ||
9c30921f UKK |
1375 | static int platform_probe(struct device *_dev) |
1376 | { | |
1377 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
1378 | struct platform_device *dev = to_platform_device(_dev); | |
1379 | int ret; | |
1380 | ||
1381 | /* | |
1382 | * A driver registered using platform_driver_probe() cannot be bound | |
1383 | * again later because the probe function usually lives in __init code | |
1384 | * and so is gone. For these drivers .probe is set to | |
1385 | * platform_probe_fail in __platform_driver_probe(). Don't even prepare | |
1386 | * clocks and PM domains for these to match the traditional behaviour. | |
1387 | */ | |
1388 | if (unlikely(drv->probe == platform_probe_fail)) | |
1389 | return -ENXIO; | |
1390 | ||
1391 | ret = of_clk_set_defaults(_dev->of_node, false); | |
1392 | if (ret < 0) | |
1393 | return ret; | |
1394 | ||
1395 | ret = dev_pm_domain_attach(_dev, true); | |
1396 | if (ret) | |
1397 | goto out; | |
1398 | ||
1399 | if (drv->probe) { | |
1400 | ret = drv->probe(dev); | |
1401 | if (ret) | |
1402 | dev_pm_domain_detach(_dev, true); | |
1403 | } | |
1404 | ||
1405 | out: | |
1406 | if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) { | |
1407 | dev_warn(_dev, "probe deferral not supported\n"); | |
1408 | ret = -ENXIO; | |
1409 | } | |
1410 | ||
1411 | return ret; | |
1412 | } | |
1413 | ||
fc7a6209 | 1414 | static void platform_remove(struct device *_dev) |
9c30921f UKK |
1415 | { |
1416 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
1417 | struct platform_device *dev = to_platform_device(_dev); | |
9c30921f | 1418 | |
e5e1c209 UKK |
1419 | if (drv->remove) { |
1420 | int ret = drv->remove(dev); | |
1421 | ||
1422 | if (ret) | |
1423 | dev_warn(_dev, "remove callback returned a non-zero value. This will be ignored.\n"); | |
1424 | } | |
9c30921f | 1425 | dev_pm_domain_detach(_dev, true); |
9c30921f UKK |
1426 | } |
1427 | ||
1428 | static void platform_shutdown(struct device *_dev) | |
1429 | { | |
9c30921f | 1430 | struct platform_device *dev = to_platform_device(_dev); |
46e85af0 DB |
1431 | struct platform_driver *drv; |
1432 | ||
1433 | if (!_dev->driver) | |
1434 | return; | |
9c30921f | 1435 | |
46e85af0 | 1436 | drv = to_platform_driver(_dev->driver); |
9c30921f UKK |
1437 | if (drv->shutdown) |
1438 | drv->shutdown(dev); | |
1439 | } | |
1440 | ||
4a6d9dd5 | 1441 | static int platform_dma_configure(struct device *dev) |
07397df2 | 1442 | { |
512881ea | 1443 | struct platform_driver *drv = to_platform_driver(dev->driver); |
07397df2 NG |
1444 | enum dev_dma_attr attr; |
1445 | int ret = 0; | |
1446 | ||
1447 | if (dev->of_node) { | |
3d6ce86e | 1448 | ret = of_dma_configure(dev, dev->of_node, true); |
07397df2 NG |
1449 | } else if (has_acpi_companion(dev)) { |
1450 | attr = acpi_get_dma_attr(to_acpi_device_node(dev->fwnode)); | |
e5361ca2 | 1451 | ret = acpi_dma_configure(dev, attr); |
07397df2 NG |
1452 | } |
1453 | ||
512881ea LB |
1454 | if (!ret && !drv->driver_managed_dma) { |
1455 | ret = iommu_device_use_default_domain(dev); | |
1456 | if (ret) | |
1457 | arch_teardown_dma_ops(dev); | |
1458 | } | |
1459 | ||
07397df2 NG |
1460 | return ret; |
1461 | } | |
1462 | ||
512881ea LB |
1463 | static void platform_dma_cleanup(struct device *dev) |
1464 | { | |
1465 | struct platform_driver *drv = to_platform_driver(dev->driver); | |
1466 | ||
1467 | if (!drv->driver_managed_dma) | |
1468 | iommu_device_unuse_default_domain(dev); | |
1469 | } | |
1470 | ||
d9ab7716 | 1471 | static const struct dev_pm_ops platform_dev_pm_ops = { |
86854b43 | 1472 | SET_RUNTIME_PM_OPS(pm_generic_runtime_suspend, pm_generic_runtime_resume, NULL) |
69c9dd1e | 1473 | USE_PLATFORM_PM_SLEEP_OPS |
25e18499 RW |
1474 | }; |
1475 | ||
1da177e4 LT |
1476 | struct bus_type platform_bus_type = { |
1477 | .name = "platform", | |
d06262e5 | 1478 | .dev_groups = platform_dev_groups, |
1da177e4 | 1479 | .match = platform_match, |
a0245f7a | 1480 | .uevent = platform_uevent, |
9c30921f UKK |
1481 | .probe = platform_probe, |
1482 | .remove = platform_remove, | |
1483 | .shutdown = platform_shutdown, | |
07397df2 | 1484 | .dma_configure = platform_dma_configure, |
512881ea | 1485 | .dma_cleanup = platform_dma_cleanup, |
9d730229 | 1486 | .pm = &platform_dev_pm_ops, |
1da177e4 | 1487 | }; |
a96b2042 | 1488 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 | 1489 | |
492c8872 ST |
1490 | static inline int __platform_match(struct device *dev, const void *drv) |
1491 | { | |
1492 | return platform_match(dev, (struct device_driver *)drv); | |
1493 | } | |
1494 | ||
36f3313d SP |
1495 | /** |
1496 | * platform_find_device_by_driver - Find a platform device with a given | |
1497 | * driver. | |
1498 | * @start: The device to start the search from. | |
1499 | * @drv: The device driver to look for. | |
1500 | */ | |
1501 | struct device *platform_find_device_by_driver(struct device *start, | |
1502 | const struct device_driver *drv) | |
1503 | { | |
1504 | return bus_find_device(&platform_bus_type, start, drv, | |
492c8872 | 1505 | __platform_match); |
36f3313d SP |
1506 | } |
1507 | EXPORT_SYMBOL_GPL(platform_find_device_by_driver); | |
1508 | ||
eecd37e1 GR |
1509 | void __weak __init early_platform_cleanup(void) { } |
1510 | ||
1da177e4 LT |
1511 | int __init platform_bus_init(void) |
1512 | { | |
fbfb1445 CH |
1513 | int error; |
1514 | ||
eecd37e1 GR |
1515 | early_platform_cleanup(); |
1516 | ||
fbfb1445 | 1517 | error = device_register(&platform_bus); |
c8ae1674 AY |
1518 | if (error) { |
1519 | put_device(&platform_bus); | |
fbfb1445 | 1520 | return error; |
c8ae1674 | 1521 | } |
fbfb1445 CH |
1522 | error = bus_register(&platform_bus_type); |
1523 | if (error) | |
1524 | device_unregister(&platform_bus); | |
801d728c | 1525 | of_platform_register_reconfig_notifier(); |
fbfb1445 | 1526 | return error; |
1da177e4 | 1527 | } |