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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 | * | |
1da177e4 LT |
8 | * Please see Documentation/driver-model/platform.txt for more |
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> | |
18 | #include <linux/dma-mapping.h> | |
57c8a661 | 19 | #include <linux/memblock.h> |
1da177e4 | 20 | #include <linux/err.h> |
4e57b681 | 21 | #include <linux/slab.h> |
9d730229 | 22 | #include <linux/pm_runtime.h> |
f48c767c | 23 | #include <linux/pm_domain.h> |
689ae231 | 24 | #include <linux/idr.h> |
91e56878 | 25 | #include <linux/acpi.h> |
86be408b | 26 | #include <linux/clk/clk-conf.h> |
3d713e0e | 27 | #include <linux/limits.h> |
00bbc1d8 | 28 | #include <linux/property.h> |
1da177e4 | 29 | |
a1bdc7aa | 30 | #include "base.h" |
bed2b42d | 31 | #include "power/power.h" |
a1bdc7aa | 32 | |
689ae231 JD |
33 | /* For automatically allocated device IDs */ |
34 | static DEFINE_IDA(platform_devid_ida); | |
35 | ||
1da177e4 | 36 | struct device platform_bus = { |
1e0b2cf9 | 37 | .init_name = "platform", |
1da177e4 | 38 | }; |
a96b2042 | 39 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 | 40 | |
a77ce816 KG |
41 | /** |
42 | * arch_setup_pdev_archdata - Allow manipulation of archdata before its used | |
7de636fa | 43 | * @pdev: platform device |
a77ce816 KG |
44 | * |
45 | * This is called before platform_device_add() such that any pdev_archdata may | |
46 | * be setup before the platform_notifier is called. So if a user needs to | |
47 | * manipulate any relevant information in the pdev_archdata they can do: | |
48 | * | |
b1d6d822 | 49 | * platform_device_alloc() |
0258e182 FP |
50 | * ... manipulate ... |
51 | * platform_device_add() | |
a77ce816 KG |
52 | * |
53 | * And if they don't care they can just call platform_device_register() and | |
54 | * everything will just work out. | |
55 | */ | |
56 | void __weak arch_setup_pdev_archdata(struct platform_device *pdev) | |
57 | { | |
58 | } | |
59 | ||
1da177e4 | 60 | /** |
4a3ad20c GKH |
61 | * platform_get_resource - get a resource for a device |
62 | * @dev: platform device | |
63 | * @type: resource type | |
64 | * @num: resource index | |
1da177e4 | 65 | */ |
4a3ad20c GKH |
66 | struct resource *platform_get_resource(struct platform_device *dev, |
67 | unsigned int type, unsigned int num) | |
1da177e4 LT |
68 | { |
69 | int i; | |
70 | ||
71 | for (i = 0; i < dev->num_resources; i++) { | |
72 | struct resource *r = &dev->resource[i]; | |
73 | ||
c9f66169 MD |
74 | if (type == resource_type(r) && num-- == 0) |
75 | return r; | |
1da177e4 LT |
76 | } |
77 | return NULL; | |
78 | } | |
a96b2042 | 79 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
80 | |
81 | /** | |
4a3ad20c GKH |
82 | * platform_get_irq - get an IRQ for a device |
83 | * @dev: platform device | |
84 | * @num: IRQ number index | |
1da177e4 LT |
85 | */ |
86 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
87 | { | |
5cf8f7db AL |
88 | #ifdef CONFIG_SPARC |
89 | /* sparc does not have irqs represented as IORESOURCE_IRQ resources */ | |
90 | if (!dev || num >= dev->archdata.num_irqs) | |
91 | return -ENXIO; | |
92 | return dev->archdata.irqs[num]; | |
93 | #else | |
9ec36caf | 94 | struct resource *r; |
aff008ad GR |
95 | if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) { |
96 | int ret; | |
97 | ||
98 | ret = of_irq_get(dev->dev.of_node, num); | |
e330b9a6 | 99 | if (ret > 0 || ret == -EPROBE_DEFER) |
aff008ad GR |
100 | return ret; |
101 | } | |
9ec36caf RH |
102 | |
103 | r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
d44fa3d4 AVF |
104 | if (has_acpi_companion(&dev->dev)) { |
105 | if (r && r->flags & IORESOURCE_DISABLED) { | |
106 | int ret; | |
107 | ||
108 | ret = acpi_irq_get(ACPI_HANDLE(&dev->dev), num, r); | |
109 | if (ret) | |
110 | return ret; | |
111 | } | |
112 | } | |
113 | ||
7085a740 LW |
114 | /* |
115 | * The resources may pass trigger flags to the irqs that need | |
116 | * to be set up. It so happens that the trigger flags for | |
117 | * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER* | |
118 | * settings. | |
119 | */ | |
60ca5e0d GR |
120 | if (r && r->flags & IORESOURCE_BITS) { |
121 | struct irq_data *irqd; | |
122 | ||
123 | irqd = irq_get_irq_data(r->start); | |
124 | if (!irqd) | |
125 | return -ENXIO; | |
126 | irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS); | |
127 | } | |
1da177e4 | 128 | |
305b3228 | 129 | return r ? r->start : -ENXIO; |
5cf8f7db | 130 | #endif |
1da177e4 | 131 | } |
a96b2042 | 132 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 | 133 | |
4b83555d SB |
134 | /** |
135 | * platform_irq_count - Count the number of IRQs a platform device uses | |
136 | * @dev: platform device | |
137 | * | |
138 | * Return: Number of IRQs a platform device uses or EPROBE_DEFER | |
139 | */ | |
140 | int platform_irq_count(struct platform_device *dev) | |
141 | { | |
142 | int ret, nr = 0; | |
143 | ||
144 | while ((ret = platform_get_irq(dev, nr)) >= 0) | |
145 | nr++; | |
146 | ||
147 | if (ret == -EPROBE_DEFER) | |
148 | return ret; | |
149 | ||
150 | return nr; | |
151 | } | |
152 | EXPORT_SYMBOL_GPL(platform_irq_count); | |
153 | ||
1da177e4 | 154 | /** |
4a3ad20c GKH |
155 | * platform_get_resource_byname - get a resource for a device by name |
156 | * @dev: platform device | |
157 | * @type: resource type | |
158 | * @name: resource name | |
1da177e4 | 159 | */ |
4a3ad20c | 160 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
161 | unsigned int type, |
162 | const char *name) | |
1da177e4 LT |
163 | { |
164 | int i; | |
165 | ||
166 | for (i = 0; i < dev->num_resources; i++) { | |
167 | struct resource *r = &dev->resource[i]; | |
168 | ||
1b8cb929 PU |
169 | if (unlikely(!r->name)) |
170 | continue; | |
171 | ||
c9f66169 MD |
172 | if (type == resource_type(r) && !strcmp(r->name, name)) |
173 | return r; | |
1da177e4 LT |
174 | } |
175 | return NULL; | |
176 | } | |
a96b2042 | 177 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
178 | |
179 | /** | |
d6ff8551 | 180 | * platform_get_irq_byname - get an IRQ for a device by name |
4a3ad20c GKH |
181 | * @dev: platform device |
182 | * @name: IRQ name | |
1da177e4 | 183 | */ |
c0afe7ba | 184 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
1da177e4 | 185 | { |
ad69674e GS |
186 | struct resource *r; |
187 | ||
aff008ad GR |
188 | if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) { |
189 | int ret; | |
190 | ||
191 | ret = of_irq_get_byname(dev->dev.of_node, name); | |
e330b9a6 | 192 | if (ret > 0 || ret == -EPROBE_DEFER) |
aff008ad GR |
193 | return ret; |
194 | } | |
1da177e4 | 195 | |
ad69674e | 196 | r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name); |
305b3228 | 197 | return r ? r->start : -ENXIO; |
1da177e4 | 198 | } |
a96b2042 | 199 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
200 | |
201 | /** | |
4a3ad20c GKH |
202 | * platform_add_devices - add a numbers of platform devices |
203 | * @devs: array of platform devices to add | |
204 | * @num: number of platform devices in array | |
1da177e4 LT |
205 | */ |
206 | int platform_add_devices(struct platform_device **devs, int num) | |
207 | { | |
208 | int i, ret = 0; | |
209 | ||
210 | for (i = 0; i < num; i++) { | |
211 | ret = platform_device_register(devs[i]); | |
212 | if (ret) { | |
213 | while (--i >= 0) | |
214 | platform_device_unregister(devs[i]); | |
215 | break; | |
216 | } | |
217 | } | |
218 | ||
219 | return ret; | |
220 | } | |
a96b2042 | 221 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 222 | |
37c12e74 RK |
223 | struct platform_object { |
224 | struct platform_device pdev; | |
1cec24c5 | 225 | char name[]; |
37c12e74 RK |
226 | }; |
227 | ||
1da177e4 | 228 | /** |
3c31f07a | 229 | * platform_device_put - destroy a platform device |
4a3ad20c | 230 | * @pdev: platform device to free |
37c12e74 | 231 | * |
4a3ad20c GKH |
232 | * Free all memory associated with a platform device. This function must |
233 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
234 | */ |
235 | void platform_device_put(struct platform_device *pdev) | |
236 | { | |
237 | if (pdev) | |
238 | put_device(&pdev->dev); | |
239 | } | |
240 | EXPORT_SYMBOL_GPL(platform_device_put); | |
241 | ||
242 | static void platform_device_release(struct device *dev) | |
243 | { | |
4a3ad20c GKH |
244 | struct platform_object *pa = container_of(dev, struct platform_object, |
245 | pdev.dev); | |
37c12e74 | 246 | |
7096d042 | 247 | of_device_node_put(&pa->pdev.dev); |
37c12e74 | 248 | kfree(pa->pdev.dev.platform_data); |
e710d7d5 | 249 | kfree(pa->pdev.mfd_cell); |
37c12e74 | 250 | kfree(pa->pdev.resource); |
3d713e0e | 251 | kfree(pa->pdev.driver_override); |
37c12e74 RK |
252 | kfree(pa); |
253 | } | |
254 | ||
255 | /** | |
3c31f07a | 256 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
257 | * @name: base name of the device we're adding |
258 | * @id: instance id | |
37c12e74 | 259 | * |
4a3ad20c GKH |
260 | * Create a platform device object which can have other objects attached |
261 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 262 | */ |
1359555e | 263 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
264 | { |
265 | struct platform_object *pa; | |
266 | ||
1cec24c5 | 267 | pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL); |
37c12e74 RK |
268 | if (pa) { |
269 | strcpy(pa->name, name); | |
270 | pa->pdev.name = pa->name; | |
271 | pa->pdev.id = id; | |
272 | device_initialize(&pa->pdev.dev); | |
273 | pa->pdev.dev.release = platform_device_release; | |
a77ce816 | 274 | arch_setup_pdev_archdata(&pa->pdev); |
37c12e74 RK |
275 | } |
276 | ||
93ce3061 | 277 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
278 | } |
279 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
280 | ||
281 | /** | |
3c31f07a | 282 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
283 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
284 | * @res: set of resources that needs to be allocated for the device | |
285 | * @num: number of resources | |
37c12e74 | 286 | * |
4a3ad20c GKH |
287 | * Add a copy of the resources to the platform device. The memory |
288 | * associated with the resources will be freed when the platform device is | |
289 | * released. | |
37c12e74 | 290 | */ |
4a3ad20c | 291 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 292 | const struct resource *res, unsigned int num) |
37c12e74 | 293 | { |
cea89623 | 294 | struct resource *r = NULL; |
37c12e74 | 295 | |
cea89623 UKK |
296 | if (res) { |
297 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); | |
298 | if (!r) | |
299 | return -ENOMEM; | |
37c12e74 | 300 | } |
cea89623 | 301 | |
4a03d6f7 | 302 | kfree(pdev->resource); |
cea89623 UKK |
303 | pdev->resource = r; |
304 | pdev->num_resources = num; | |
305 | return 0; | |
37c12e74 RK |
306 | } |
307 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
308 | ||
309 | /** | |
3c31f07a | 310 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
311 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
312 | * @data: platform specific data for this platform device | |
313 | * @size: size of platform specific data | |
37c12e74 | 314 | * |
4a3ad20c GKH |
315 | * Add a copy of platform specific data to the platform device's |
316 | * platform_data pointer. The memory associated with the platform data | |
317 | * will be freed when the platform device is released. | |
37c12e74 | 318 | */ |
4a3ad20c GKH |
319 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
320 | size_t size) | |
37c12e74 | 321 | { |
27a33f9e | 322 | void *d = NULL; |
5cfc64ce | 323 | |
27a33f9e UKK |
324 | if (data) { |
325 | d = kmemdup(data, size, GFP_KERNEL); | |
326 | if (!d) | |
327 | return -ENOMEM; | |
37c12e74 | 328 | } |
27a33f9e | 329 | |
251e031d | 330 | kfree(pdev->dev.platform_data); |
27a33f9e UKK |
331 | pdev->dev.platform_data = d; |
332 | return 0; | |
37c12e74 RK |
333 | } |
334 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
335 | ||
00bbc1d8 MW |
336 | /** |
337 | * platform_device_add_properties - add built-in properties to a platform device | |
338 | * @pdev: platform device to add properties to | |
f4d05266 | 339 | * @properties: null terminated array of properties to add |
00bbc1d8 | 340 | * |
f4d05266 HK |
341 | * The function will take deep copy of @properties and attach the copy to the |
342 | * platform device. The memory associated with properties will be freed when the | |
343 | * platform device is released. | |
00bbc1d8 MW |
344 | */ |
345 | int platform_device_add_properties(struct platform_device *pdev, | |
277036f0 | 346 | const struct property_entry *properties) |
00bbc1d8 | 347 | { |
f4d05266 | 348 | return device_add_properties(&pdev->dev, properties); |
00bbc1d8 MW |
349 | } |
350 | EXPORT_SYMBOL_GPL(platform_device_add_properties); | |
351 | ||
37c12e74 | 352 | /** |
4a3ad20c GKH |
353 | * platform_device_add - add a platform device to device hierarchy |
354 | * @pdev: platform device we're adding | |
1da177e4 | 355 | * |
4a3ad20c GKH |
356 | * This is part 2 of platform_device_register(), though may be called |
357 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 358 | */ |
37c12e74 | 359 | int platform_device_add(struct platform_device *pdev) |
1da177e4 | 360 | { |
689ae231 | 361 | int i, ret; |
1da177e4 LT |
362 | |
363 | if (!pdev) | |
364 | return -EINVAL; | |
365 | ||
366 | if (!pdev->dev.parent) | |
367 | pdev->dev.parent = &platform_bus; | |
368 | ||
369 | pdev->dev.bus = &platform_bus_type; | |
370 | ||
689ae231 JD |
371 | switch (pdev->id) { |
372 | default: | |
1e0b2cf9 | 373 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
689ae231 JD |
374 | break; |
375 | case PLATFORM_DEVID_NONE: | |
acc0e90f | 376 | dev_set_name(&pdev->dev, "%s", pdev->name); |
689ae231 JD |
377 | break; |
378 | case PLATFORM_DEVID_AUTO: | |
379 | /* | |
380 | * Automatically allocated device ID. We mark it as such so | |
381 | * that we remember it must be freed, and we append a suffix | |
382 | * to avoid namespace collision with explicit IDs. | |
383 | */ | |
384 | ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL); | |
385 | if (ret < 0) | |
5da7f709 | 386 | goto err_out; |
689ae231 JD |
387 | pdev->id = ret; |
388 | pdev->id_auto = true; | |
389 | dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); | |
390 | break; | |
391 | } | |
1da177e4 LT |
392 | |
393 | for (i = 0; i < pdev->num_resources; i++) { | |
5da7f709 | 394 | struct resource *p, *r = &pdev->resource[i]; |
1da177e4 LT |
395 | |
396 | if (r->name == NULL) | |
1e0b2cf9 | 397 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
398 | |
399 | p = r->parent; | |
400 | if (!p) { | |
0e6c861f | 401 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 402 | p = &iomem_resource; |
0e6c861f | 403 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
404 | p = &ioport_resource; |
405 | } | |
406 | ||
0e6c861f | 407 | if (p && insert_resource(p, r)) { |
8a18f428 | 408 | dev_err(&pdev->dev, "failed to claim resource %d: %pR\n", i, r); |
5da7f709 GKH |
409 | ret = -EBUSY; |
410 | goto failed; | |
411 | } | |
1da177e4 LT |
412 | } |
413 | ||
414 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 415 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 416 | |
e3915532 | 417 | ret = device_add(&pdev->dev); |
8b2dceba GKH |
418 | if (ret == 0) |
419 | return ret; | |
420 | ||
5da7f709 | 421 | failed: |
8b2dceba GKH |
422 | if (pdev->id_auto) { |
423 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
424 | pdev->id = PLATFORM_DEVID_AUTO; | |
425 | } | |
426 | ||
427 | while (--i >= 0) { | |
428 | struct resource *r = &pdev->resource[i]; | |
7f5dcaf1 | 429 | if (r->parent) |
8b2dceba GKH |
430 | release_resource(r); |
431 | } | |
c9f66169 | 432 | |
5da7f709 | 433 | err_out: |
1da177e4 LT |
434 | return ret; |
435 | } | |
37c12e74 RK |
436 | EXPORT_SYMBOL_GPL(platform_device_add); |
437 | ||
438 | /** | |
4a3ad20c GKH |
439 | * platform_device_del - remove a platform-level device |
440 | * @pdev: platform device we're removing | |
1da177e4 | 441 | * |
4a3ad20c GKH |
442 | * Note that this function will also release all memory- and port-based |
443 | * resources owned by the device (@dev->resource). This function must | |
444 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 445 | */ |
93ce3061 | 446 | void platform_device_del(struct platform_device *pdev) |
1da177e4 | 447 | { |
8b2dceba | 448 | int i; |
c9f66169 | 449 | |
8b2dceba | 450 | if (pdev) { |
c90aab9c | 451 | device_remove_properties(&pdev->dev); |
8b2dceba GKH |
452 | device_del(&pdev->dev); |
453 | ||
454 | if (pdev->id_auto) { | |
455 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
456 | pdev->id = PLATFORM_DEVID_AUTO; | |
457 | } | |
458 | ||
459 | for (i = 0; i < pdev->num_resources; i++) { | |
460 | struct resource *r = &pdev->resource[i]; | |
7f5dcaf1 | 461 | if (r->parent) |
8b2dceba GKH |
462 | release_resource(r); |
463 | } | |
464 | } | |
1da177e4 | 465 | } |
93ce3061 DT |
466 | EXPORT_SYMBOL_GPL(platform_device_del); |
467 | ||
468 | /** | |
4a3ad20c GKH |
469 | * platform_device_register - add a platform-level device |
470 | * @pdev: platform device we're adding | |
93ce3061 | 471 | */ |
4a3ad20c | 472 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
473 | { |
474 | device_initialize(&pdev->dev); | |
a77ce816 | 475 | arch_setup_pdev_archdata(pdev); |
93ce3061 DT |
476 | return platform_device_add(pdev); |
477 | } | |
a96b2042 | 478 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
479 | |
480 | /** | |
4a3ad20c GKH |
481 | * platform_device_unregister - unregister a platform-level device |
482 | * @pdev: platform device we're unregistering | |
93ce3061 | 483 | * |
4a3ad20c GKH |
484 | * Unregistration is done in 2 steps. First we release all resources |
485 | * and remove it from the subsystem, then we drop reference count by | |
486 | * calling platform_device_put(). | |
93ce3061 | 487 | */ |
4a3ad20c | 488 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
489 | { |
490 | platform_device_del(pdev); | |
491 | platform_device_put(pdev); | |
492 | } | |
a96b2042 | 493 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 494 | |
1da177e4 | 495 | /** |
01dcc60a | 496 | * platform_device_register_full - add a platform-level device with |
44f28bde | 497 | * resources and platform-specific data |
49a4ec18 | 498 | * |
01dcc60a | 499 | * @pdevinfo: data used to create device |
d8bf2540 | 500 | * |
f0eae0ed | 501 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 502 | */ |
01dcc60a | 503 | struct platform_device *platform_device_register_full( |
5a3072be | 504 | const struct platform_device_info *pdevinfo) |
d8bf2540 | 505 | { |
44f28bde | 506 | int ret = -ENOMEM; |
d8bf2540 | 507 | struct platform_device *pdev; |
d8bf2540 | 508 | |
01dcc60a | 509 | pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
44f28bde | 510 | if (!pdev) |
01dcc60a UKK |
511 | goto err_alloc; |
512 | ||
513 | pdev->dev.parent = pdevinfo->parent; | |
ce793486 | 514 | pdev->dev.fwnode = pdevinfo->fwnode; |
01dcc60a UKK |
515 | |
516 | if (pdevinfo->dma_mask) { | |
517 | /* | |
518 | * This memory isn't freed when the device is put, | |
519 | * I don't have a nice idea for that though. Conceptually | |
520 | * dma_mask in struct device should not be a pointer. | |
521 | * See http://thread.gmane.org/gmane.linux.kernel.pci/9081 | |
522 | */ | |
523 | pdev->dev.dma_mask = | |
524 | kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); | |
525 | if (!pdev->dev.dma_mask) | |
526 | goto err; | |
527 | ||
528 | *pdev->dev.dma_mask = pdevinfo->dma_mask; | |
529 | pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; | |
530 | } | |
d8bf2540 | 531 | |
01dcc60a UKK |
532 | ret = platform_device_add_resources(pdev, |
533 | pdevinfo->res, pdevinfo->num_res); | |
807508c8 AV |
534 | if (ret) |
535 | goto err; | |
44f28bde | 536 | |
01dcc60a UKK |
537 | ret = platform_device_add_data(pdev, |
538 | pdevinfo->data, pdevinfo->size_data); | |
807508c8 AV |
539 | if (ret) |
540 | goto err; | |
d8bf2540 | 541 | |
f4d05266 HK |
542 | if (pdevinfo->properties) { |
543 | ret = platform_device_add_properties(pdev, | |
544 | pdevinfo->properties); | |
00bbc1d8 MW |
545 | if (ret) |
546 | goto err; | |
547 | } | |
548 | ||
44f28bde UKK |
549 | ret = platform_device_add(pdev); |
550 | if (ret) { | |
551 | err: | |
7b199811 | 552 | ACPI_COMPANION_SET(&pdev->dev, NULL); |
01dcc60a UKK |
553 | kfree(pdev->dev.dma_mask); |
554 | ||
555 | err_alloc: | |
44f28bde UKK |
556 | platform_device_put(pdev); |
557 | return ERR_PTR(ret); | |
558 | } | |
d8bf2540 DB |
559 | |
560 | return pdev; | |
d8bf2540 | 561 | } |
01dcc60a | 562 | EXPORT_SYMBOL_GPL(platform_device_register_full); |
d8bf2540 | 563 | |
00d3dcdd RK |
564 | static int platform_drv_probe(struct device *_dev) |
565 | { | |
566 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
567 | struct platform_device *dev = to_platform_device(_dev); | |
94d76d5d | 568 | int ret; |
00d3dcdd | 569 | |
86be408b SN |
570 | ret = of_clk_set_defaults(_dev->of_node, false); |
571 | if (ret < 0) | |
572 | return ret; | |
573 | ||
cb518413 | 574 | ret = dev_pm_domain_attach(_dev, true); |
88a9769e UH |
575 | if (ret) |
576 | goto out; | |
577 | ||
578 | if (drv->probe) { | |
579 | ret = drv->probe(dev); | |
580 | if (ret) | |
581 | dev_pm_domain_detach(_dev, true); | |
cb518413 | 582 | } |
94d76d5d | 583 | |
88a9769e | 584 | out: |
3f9120b0 JH |
585 | if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) { |
586 | dev_warn(_dev, "probe deferral not supported\n"); | |
587 | ret = -ENXIO; | |
588 | } | |
589 | ||
94d76d5d | 590 | return ret; |
00d3dcdd RK |
591 | } |
592 | ||
c67334fb DB |
593 | static int platform_drv_probe_fail(struct device *_dev) |
594 | { | |
595 | return -ENXIO; | |
596 | } | |
597 | ||
00d3dcdd RK |
598 | static int platform_drv_remove(struct device *_dev) |
599 | { | |
600 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
601 | struct platform_device *dev = to_platform_device(_dev); | |
b8b2c7d8 | 602 | int ret = 0; |
00d3dcdd | 603 | |
b8b2c7d8 UKK |
604 | if (drv->remove) |
605 | ret = drv->remove(dev); | |
cb518413 | 606 | dev_pm_domain_detach(_dev, true); |
94d76d5d RW |
607 | |
608 | return ret; | |
00d3dcdd RK |
609 | } |
610 | ||
611 | static void platform_drv_shutdown(struct device *_dev) | |
612 | { | |
613 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
614 | struct platform_device *dev = to_platform_device(_dev); | |
615 | ||
b8b2c7d8 UKK |
616 | if (drv->shutdown) |
617 | drv->shutdown(dev); | |
00d3dcdd RK |
618 | } |
619 | ||
00d3dcdd | 620 | /** |
9447057e | 621 | * __platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 622 | * @drv: platform driver structure |
08801f96 | 623 | * @owner: owning module/driver |
00d3dcdd | 624 | */ |
9447057e LC |
625 | int __platform_driver_register(struct platform_driver *drv, |
626 | struct module *owner) | |
00d3dcdd | 627 | { |
9447057e | 628 | drv->driver.owner = owner; |
00d3dcdd | 629 | drv->driver.bus = &platform_bus_type; |
b8b2c7d8 UKK |
630 | drv->driver.probe = platform_drv_probe; |
631 | drv->driver.remove = platform_drv_remove; | |
632 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 633 | |
00d3dcdd RK |
634 | return driver_register(&drv->driver); |
635 | } | |
9447057e | 636 | EXPORT_SYMBOL_GPL(__platform_driver_register); |
00d3dcdd RK |
637 | |
638 | /** | |
3c31f07a | 639 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 640 | * @drv: platform driver structure |
00d3dcdd RK |
641 | */ |
642 | void platform_driver_unregister(struct platform_driver *drv) | |
643 | { | |
644 | driver_unregister(&drv->driver); | |
645 | } | |
646 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
647 | ||
c67334fb | 648 | /** |
c3b50dc2 | 649 | * __platform_driver_probe - register driver for non-hotpluggable device |
c67334fb | 650 | * @drv: platform driver structure |
3f9120b0 | 651 | * @probe: the driver probe routine, probably from an __init section |
c3b50dc2 | 652 | * @module: module which will be the owner of the driver |
c67334fb DB |
653 | * |
654 | * Use this instead of platform_driver_register() when you know the device | |
655 | * is not hotpluggable and has already been registered, and you want to | |
656 | * remove its run-once probe() infrastructure from memory after the driver | |
657 | * has bound to the device. | |
658 | * | |
659 | * One typical use for this would be with drivers for controllers integrated | |
660 | * into system-on-chip processors, where the controller devices have been | |
661 | * configured as part of board setup. | |
662 | * | |
3f9120b0 | 663 | * Note that this is incompatible with deferred probing. |
647c86d0 | 664 | * |
c67334fb DB |
665 | * Returns zero if the driver registered and bound to a device, else returns |
666 | * a negative error code and with the driver not registered. | |
667 | */ | |
c3b50dc2 WS |
668 | int __init_or_module __platform_driver_probe(struct platform_driver *drv, |
669 | int (*probe)(struct platform_device *), struct module *module) | |
c67334fb DB |
670 | { |
671 | int retval, code; | |
672 | ||
5c36eb2a DT |
673 | if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) { |
674 | pr_err("%s: drivers registered with %s can not be probed asynchronously\n", | |
675 | drv->driver.name, __func__); | |
676 | return -EINVAL; | |
677 | } | |
678 | ||
679 | /* | |
680 | * We have to run our probes synchronously because we check if | |
681 | * we find any devices to bind to and exit with error if there | |
682 | * are any. | |
683 | */ | |
684 | drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS; | |
685 | ||
3f9120b0 JH |
686 | /* |
687 | * Prevent driver from requesting probe deferral to avoid further | |
688 | * futile probe attempts. | |
689 | */ | |
690 | drv->prevent_deferred_probe = true; | |
691 | ||
1a6f2a75 DT |
692 | /* make sure driver won't have bind/unbind attributes */ |
693 | drv->driver.suppress_bind_attrs = true; | |
694 | ||
c67334fb DB |
695 | /* temporary section violation during probe() */ |
696 | drv->probe = probe; | |
c3b50dc2 | 697 | retval = code = __platform_driver_register(drv, module); |
c67334fb | 698 | |
1a6f2a75 DT |
699 | /* |
700 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
701 | * the list of drivers in order to probe new devices. Check to see |
702 | * if the probe was successful, and make sure any forced probes of | |
703 | * new devices fail. | |
704 | */ | |
d79d3244 | 705 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb | 706 | drv->probe = NULL; |
e5dd1278 | 707 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
708 | retval = -ENODEV; |
709 | drv->driver.probe = platform_drv_probe_fail; | |
d79d3244 | 710 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
711 | |
712 | if (code != retval) | |
713 | platform_driver_unregister(drv); | |
714 | return retval; | |
715 | } | |
c3b50dc2 | 716 | EXPORT_SYMBOL_GPL(__platform_driver_probe); |
1da177e4 | 717 | |
ecdf6ceb | 718 | /** |
291f653a | 719 | * __platform_create_bundle - register driver and create corresponding device |
ecdf6ceb DT |
720 | * @driver: platform driver structure |
721 | * @probe: the driver probe routine, probably from an __init section | |
722 | * @res: set of resources that needs to be allocated for the device | |
723 | * @n_res: number of resources | |
724 | * @data: platform specific data for this platform device | |
725 | * @size: size of platform specific data | |
291f653a | 726 | * @module: module which will be the owner of the driver |
ecdf6ceb DT |
727 | * |
728 | * Use this in legacy-style modules that probe hardware directly and | |
729 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
730 | * |
731 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb | 732 | */ |
291f653a | 733 | struct platform_device * __init_or_module __platform_create_bundle( |
ecdf6ceb DT |
734 | struct platform_driver *driver, |
735 | int (*probe)(struct platform_device *), | |
736 | struct resource *res, unsigned int n_res, | |
291f653a | 737 | const void *data, size_t size, struct module *module) |
ecdf6ceb DT |
738 | { |
739 | struct platform_device *pdev; | |
740 | int error; | |
741 | ||
742 | pdev = platform_device_alloc(driver->driver.name, -1); | |
743 | if (!pdev) { | |
744 | error = -ENOMEM; | |
745 | goto err_out; | |
746 | } | |
747 | ||
807508c8 AV |
748 | error = platform_device_add_resources(pdev, res, n_res); |
749 | if (error) | |
750 | goto err_pdev_put; | |
ecdf6ceb | 751 | |
807508c8 AV |
752 | error = platform_device_add_data(pdev, data, size); |
753 | if (error) | |
754 | goto err_pdev_put; | |
ecdf6ceb DT |
755 | |
756 | error = platform_device_add(pdev); | |
757 | if (error) | |
758 | goto err_pdev_put; | |
759 | ||
291f653a | 760 | error = __platform_driver_probe(driver, probe, module); |
ecdf6ceb DT |
761 | if (error) |
762 | goto err_pdev_del; | |
763 | ||
764 | return pdev; | |
765 | ||
766 | err_pdev_del: | |
767 | platform_device_del(pdev); | |
768 | err_pdev_put: | |
769 | platform_device_put(pdev); | |
770 | err_out: | |
771 | return ERR_PTR(error); | |
772 | } | |
291f653a | 773 | EXPORT_SYMBOL_GPL(__platform_create_bundle); |
ecdf6ceb | 774 | |
dbe2256d TR |
775 | /** |
776 | * __platform_register_drivers - register an array of platform drivers | |
777 | * @drivers: an array of drivers to register | |
778 | * @count: the number of drivers to register | |
779 | * @owner: module owning the drivers | |
780 | * | |
781 | * Registers platform drivers specified by an array. On failure to register a | |
782 | * driver, all previously registered drivers will be unregistered. Callers of | |
783 | * this API should use platform_unregister_drivers() to unregister drivers in | |
784 | * the reverse order. | |
785 | * | |
786 | * Returns: 0 on success or a negative error code on failure. | |
787 | */ | |
788 | int __platform_register_drivers(struct platform_driver * const *drivers, | |
789 | unsigned int count, struct module *owner) | |
790 | { | |
791 | unsigned int i; | |
792 | int err; | |
793 | ||
794 | for (i = 0; i < count; i++) { | |
795 | pr_debug("registering platform driver %ps\n", drivers[i]); | |
796 | ||
797 | err = __platform_driver_register(drivers[i], owner); | |
798 | if (err < 0) { | |
799 | pr_err("failed to register platform driver %ps: %d\n", | |
800 | drivers[i], err); | |
801 | goto error; | |
802 | } | |
803 | } | |
804 | ||
805 | return 0; | |
806 | ||
807 | error: | |
808 | while (i--) { | |
809 | pr_debug("unregistering platform driver %ps\n", drivers[i]); | |
810 | platform_driver_unregister(drivers[i]); | |
811 | } | |
812 | ||
813 | return err; | |
814 | } | |
815 | EXPORT_SYMBOL_GPL(__platform_register_drivers); | |
816 | ||
817 | /** | |
818 | * platform_unregister_drivers - unregister an array of platform drivers | |
819 | * @drivers: an array of drivers to unregister | |
820 | * @count: the number of drivers to unregister | |
821 | * | |
822 | * Unegisters platform drivers specified by an array. This is typically used | |
823 | * to complement an earlier call to platform_register_drivers(). Drivers are | |
824 | * unregistered in the reverse order in which they were registered. | |
825 | */ | |
826 | void platform_unregister_drivers(struct platform_driver * const *drivers, | |
827 | unsigned int count) | |
828 | { | |
829 | while (count--) { | |
830 | pr_debug("unregistering platform driver %ps\n", drivers[count]); | |
831 | platform_driver_unregister(drivers[count]); | |
832 | } | |
833 | } | |
834 | EXPORT_SYMBOL_GPL(platform_unregister_drivers); | |
835 | ||
a0245f7a DB |
836 | /* modalias support enables more hands-off userspace setup: |
837 | * (a) environment variable lets new-style hotplug events work once system is | |
838 | * fully running: "modprobe $MODALIAS" | |
839 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
840 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
841 | */ | |
4a3ad20c GKH |
842 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
843 | char *buf) | |
a0245f7a DB |
844 | { |
845 | struct platform_device *pdev = to_platform_device(dev); | |
8c4ff6d0 ZR |
846 | int len; |
847 | ||
0634c295 | 848 | len = of_device_modalias(dev, buf, PAGE_SIZE); |
b9f73067 ZR |
849 | if (len != -ENODEV) |
850 | return len; | |
851 | ||
8c4ff6d0 ZR |
852 | len = acpi_device_modalias(dev, buf, PAGE_SIZE -1); |
853 | if (len != -ENODEV) | |
854 | return len; | |
855 | ||
856 | len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); | |
a0245f7a DB |
857 | |
858 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
859 | } | |
d06262e5 | 860 | static DEVICE_ATTR_RO(modalias); |
a0245f7a | 861 | |
3d713e0e KP |
862 | static ssize_t driver_override_store(struct device *dev, |
863 | struct device_attribute *attr, | |
864 | const char *buf, size_t count) | |
865 | { | |
866 | struct platform_device *pdev = to_platform_device(dev); | |
62655397 | 867 | char *driver_override, *old, *cp; |
3d713e0e | 868 | |
bf563b01 NS |
869 | /* We need to keep extra room for a newline */ |
870 | if (count >= (PAGE_SIZE - 1)) | |
3d713e0e KP |
871 | return -EINVAL; |
872 | ||
873 | driver_override = kstrndup(buf, count, GFP_KERNEL); | |
874 | if (!driver_override) | |
875 | return -ENOMEM; | |
876 | ||
877 | cp = strchr(driver_override, '\n'); | |
878 | if (cp) | |
879 | *cp = '\0'; | |
880 | ||
62655397 AS |
881 | device_lock(dev); |
882 | old = pdev->driver_override; | |
3d713e0e KP |
883 | if (strlen(driver_override)) { |
884 | pdev->driver_override = driver_override; | |
885 | } else { | |
886 | kfree(driver_override); | |
887 | pdev->driver_override = NULL; | |
888 | } | |
62655397 | 889 | device_unlock(dev); |
3d713e0e KP |
890 | |
891 | kfree(old); | |
892 | ||
893 | return count; | |
894 | } | |
895 | ||
896 | static ssize_t driver_override_show(struct device *dev, | |
897 | struct device_attribute *attr, char *buf) | |
898 | { | |
899 | struct platform_device *pdev = to_platform_device(dev); | |
62655397 | 900 | ssize_t len; |
3d713e0e | 901 | |
62655397 AS |
902 | device_lock(dev); |
903 | len = sprintf(buf, "%s\n", pdev->driver_override); | |
904 | device_unlock(dev); | |
905 | return len; | |
3d713e0e KP |
906 | } |
907 | static DEVICE_ATTR_RW(driver_override); | |
908 | ||
909 | ||
d06262e5 GKH |
910 | static struct attribute *platform_dev_attrs[] = { |
911 | &dev_attr_modalias.attr, | |
3d713e0e | 912 | &dev_attr_driver_override.attr, |
d06262e5 | 913 | NULL, |
a0245f7a | 914 | }; |
d06262e5 | 915 | ATTRIBUTE_GROUPS(platform_dev); |
a0245f7a | 916 | |
7eff2e7a | 917 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
918 | { |
919 | struct platform_device *pdev = to_platform_device(dev); | |
eca39301 GL |
920 | int rc; |
921 | ||
922 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
0258e182 | 923 | rc = of_device_uevent_modalias(dev, env); |
eca39301 GL |
924 | if (rc != -ENODEV) |
925 | return rc; | |
a0245f7a | 926 | |
8c4ff6d0 ZR |
927 | rc = acpi_device_uevent_modalias(dev, env); |
928 | if (rc != -ENODEV) | |
929 | return rc; | |
930 | ||
57fee4a5 | 931 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
0a26813c | 932 | pdev->name); |
a0245f7a DB |
933 | return 0; |
934 | } | |
935 | ||
57fee4a5 | 936 | static const struct platform_device_id *platform_match_id( |
831fad2f | 937 | const struct platform_device_id *id, |
57fee4a5 EM |
938 | struct platform_device *pdev) |
939 | { | |
940 | while (id->name[0]) { | |
941 | if (strcmp(pdev->name, id->name) == 0) { | |
942 | pdev->id_entry = id; | |
943 | return id; | |
944 | } | |
945 | id++; | |
946 | } | |
947 | return NULL; | |
948 | } | |
949 | ||
1da177e4 | 950 | /** |
4a3ad20c GKH |
951 | * platform_match - bind platform device to platform driver. |
952 | * @dev: device. | |
953 | * @drv: driver. | |
1da177e4 | 954 | * |
4a3ad20c GKH |
955 | * Platform device IDs are assumed to be encoded like this: |
956 | * "<name><instance>", where <name> is a short description of the type of | |
957 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
958 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
959 | * "<name>". So, extract the <name> from the platform_device structure, | |
960 | * and compare it against the name of the driver. Return whether they match | |
961 | * or not. | |
1da177e4 | 962 | */ |
4a3ad20c | 963 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 964 | { |
71b3e0c1 | 965 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
966 | struct platform_driver *pdrv = to_platform_driver(drv); |
967 | ||
3d713e0e KP |
968 | /* When driver_override is set, only bind to the matching driver */ |
969 | if (pdev->driver_override) | |
970 | return !strcmp(pdev->driver_override, drv->name); | |
971 | ||
05212157 GL |
972 | /* Attempt an OF style match first */ |
973 | if (of_driver_match_device(dev, drv)) | |
974 | return 1; | |
975 | ||
91e56878 MW |
976 | /* Then try ACPI style match */ |
977 | if (acpi_driver_match_device(dev, drv)) | |
978 | return 1; | |
979 | ||
05212157 | 980 | /* Then try to match against the id table */ |
57fee4a5 EM |
981 | if (pdrv->id_table) |
982 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 983 | |
57fee4a5 | 984 | /* fall-back to driver name match */ |
1e0b2cf9 | 985 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
986 | } |
987 | ||
25e18499 RW |
988 | #ifdef CONFIG_PM_SLEEP |
989 | ||
990 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 991 | { |
783ea7d4 MD |
992 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
993 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
994 | int ret = 0; |
995 | ||
783ea7d4 MD |
996 | if (dev->driver && pdrv->suspend) |
997 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
998 | |
999 | return ret; | |
1000 | } | |
1001 | ||
25e18499 | 1002 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 1003 | { |
783ea7d4 MD |
1004 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
1005 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
1006 | int ret = 0; |
1007 | ||
783ea7d4 MD |
1008 | if (dev->driver && pdrv->resume) |
1009 | ret = pdrv->resume(pdev); | |
9480e307 | 1010 | |
1da177e4 LT |
1011 | return ret; |
1012 | } | |
1013 | ||
69c9dd1e | 1014 | #endif /* CONFIG_PM_SLEEP */ |
9d730229 | 1015 | |
25e18499 RW |
1016 | #ifdef CONFIG_SUSPEND |
1017 | ||
69c9dd1e | 1018 | int platform_pm_suspend(struct device *dev) |
25e18499 RW |
1019 | { |
1020 | struct device_driver *drv = dev->driver; | |
1021 | int ret = 0; | |
1022 | ||
adf09493 RW |
1023 | if (!drv) |
1024 | return 0; | |
1025 | ||
1026 | if (drv->pm) { | |
25e18499 RW |
1027 | if (drv->pm->suspend) |
1028 | ret = drv->pm->suspend(dev); | |
1029 | } else { | |
1030 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
1031 | } | |
1032 | ||
1033 | return ret; | |
1034 | } | |
1035 | ||
69c9dd1e | 1036 | int platform_pm_resume(struct device *dev) |
25e18499 RW |
1037 | { |
1038 | struct device_driver *drv = dev->driver; | |
1039 | int ret = 0; | |
1040 | ||
adf09493 RW |
1041 | if (!drv) |
1042 | return 0; | |
1043 | ||
1044 | if (drv->pm) { | |
25e18499 RW |
1045 | if (drv->pm->resume) |
1046 | ret = drv->pm->resume(dev); | |
1047 | } else { | |
1048 | ret = platform_legacy_resume(dev); | |
1049 | } | |
1050 | ||
1051 | return ret; | |
1052 | } | |
1053 | ||
69c9dd1e | 1054 | #endif /* CONFIG_SUSPEND */ |
25e18499 | 1055 | |
1f112cee | 1056 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 | 1057 | |
69c9dd1e | 1058 | int platform_pm_freeze(struct device *dev) |
25e18499 RW |
1059 | { |
1060 | struct device_driver *drv = dev->driver; | |
1061 | int ret = 0; | |
1062 | ||
1063 | if (!drv) | |
1064 | return 0; | |
1065 | ||
1066 | if (drv->pm) { | |
1067 | if (drv->pm->freeze) | |
1068 | ret = drv->pm->freeze(dev); | |
1069 | } else { | |
1070 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
1071 | } | |
1072 | ||
1073 | return ret; | |
1074 | } | |
1075 | ||
69c9dd1e | 1076 | int platform_pm_thaw(struct device *dev) |
25e18499 RW |
1077 | { |
1078 | struct device_driver *drv = dev->driver; | |
1079 | int ret = 0; | |
1080 | ||
adf09493 RW |
1081 | if (!drv) |
1082 | return 0; | |
1083 | ||
1084 | if (drv->pm) { | |
25e18499 RW |
1085 | if (drv->pm->thaw) |
1086 | ret = drv->pm->thaw(dev); | |
1087 | } else { | |
1088 | ret = platform_legacy_resume(dev); | |
1089 | } | |
1090 | ||
1091 | return ret; | |
1092 | } | |
1093 | ||
69c9dd1e | 1094 | int platform_pm_poweroff(struct device *dev) |
25e18499 RW |
1095 | { |
1096 | struct device_driver *drv = dev->driver; | |
1097 | int ret = 0; | |
1098 | ||
adf09493 RW |
1099 | if (!drv) |
1100 | return 0; | |
1101 | ||
1102 | if (drv->pm) { | |
25e18499 RW |
1103 | if (drv->pm->poweroff) |
1104 | ret = drv->pm->poweroff(dev); | |
1105 | } else { | |
1106 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
1107 | } | |
1108 | ||
1109 | return ret; | |
1110 | } | |
1111 | ||
69c9dd1e | 1112 | int platform_pm_restore(struct device *dev) |
25e18499 RW |
1113 | { |
1114 | struct device_driver *drv = dev->driver; | |
1115 | int ret = 0; | |
1116 | ||
adf09493 RW |
1117 | if (!drv) |
1118 | return 0; | |
1119 | ||
1120 | if (drv->pm) { | |
25e18499 RW |
1121 | if (drv->pm->restore) |
1122 | ret = drv->pm->restore(dev); | |
1123 | } else { | |
1124 | ret = platform_legacy_resume(dev); | |
1125 | } | |
1126 | ||
1127 | return ret; | |
1128 | } | |
1129 | ||
69c9dd1e | 1130 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 1131 | |
07397df2 NG |
1132 | int platform_dma_configure(struct device *dev) |
1133 | { | |
1134 | enum dev_dma_attr attr; | |
1135 | int ret = 0; | |
1136 | ||
1137 | if (dev->of_node) { | |
3d6ce86e | 1138 | ret = of_dma_configure(dev, dev->of_node, true); |
07397df2 NG |
1139 | } else if (has_acpi_companion(dev)) { |
1140 | attr = acpi_get_dma_attr(to_acpi_device_node(dev->fwnode)); | |
1141 | if (attr != DEV_DMA_NOT_SUPPORTED) | |
1142 | ret = acpi_dma_configure(dev, attr); | |
1143 | } | |
1144 | ||
1145 | return ret; | |
1146 | } | |
1147 | ||
d9ab7716 | 1148 | static const struct dev_pm_ops platform_dev_pm_ops = { |
8b313a38 RW |
1149 | .runtime_suspend = pm_generic_runtime_suspend, |
1150 | .runtime_resume = pm_generic_runtime_resume, | |
69c9dd1e | 1151 | USE_PLATFORM_PM_SLEEP_OPS |
25e18499 RW |
1152 | }; |
1153 | ||
1da177e4 LT |
1154 | struct bus_type platform_bus_type = { |
1155 | .name = "platform", | |
d06262e5 | 1156 | .dev_groups = platform_dev_groups, |
1da177e4 | 1157 | .match = platform_match, |
a0245f7a | 1158 | .uevent = platform_uevent, |
07397df2 | 1159 | .dma_configure = platform_dma_configure, |
9d730229 | 1160 | .pm = &platform_dev_pm_ops, |
1da177e4 | 1161 | }; |
a96b2042 | 1162 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
1163 | |
1164 | int __init platform_bus_init(void) | |
1165 | { | |
fbfb1445 CH |
1166 | int error; |
1167 | ||
13977091 MD |
1168 | early_platform_cleanup(); |
1169 | ||
fbfb1445 | 1170 | error = device_register(&platform_bus); |
c8ae1674 AY |
1171 | if (error) { |
1172 | put_device(&platform_bus); | |
fbfb1445 | 1173 | return error; |
c8ae1674 | 1174 | } |
fbfb1445 CH |
1175 | error = bus_register(&platform_bus_type); |
1176 | if (error) | |
1177 | device_unregister(&platform_bus); | |
801d728c | 1178 | of_platform_register_reconfig_notifier(); |
fbfb1445 | 1179 | return error; |
1da177e4 LT |
1180 | } |
1181 | ||
6db37ad7 | 1182 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK |
c6d43812 | 1183 | static u64 dma_default_get_required_mask(struct device *dev) |
1da177e4 LT |
1184 | { |
1185 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
1186 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
1187 | u64 mask; | |
1188 | ||
1189 | if (!high_totalram) { | |
1190 | /* convert to mask just covering totalram */ | |
1191 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
1192 | low_totalram += low_totalram - 1; | |
1193 | mask = low_totalram; | |
1194 | } else { | |
1195 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
1196 | high_totalram += high_totalram - 1; | |
1197 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
1198 | } | |
e88a0c2c | 1199 | return mask; |
1da177e4 | 1200 | } |
c6d43812 | 1201 | |
c6d43812 CH |
1202 | u64 dma_get_required_mask(struct device *dev) |
1203 | { | |
1204 | const struct dma_map_ops *ops = get_dma_ops(dev); | |
1205 | ||
1206 | if (ops->get_required_mask) | |
1207 | return ops->get_required_mask(dev); | |
1208 | return dma_default_get_required_mask(dev); | |
1209 | } | |
1da177e4 LT |
1210 | EXPORT_SYMBOL_GPL(dma_get_required_mask); |
1211 | #endif | |
13977091 MD |
1212 | |
1213 | static __initdata LIST_HEAD(early_platform_driver_list); | |
1214 | static __initdata LIST_HEAD(early_platform_device_list); | |
1215 | ||
1216 | /** | |
4d26e139 | 1217 | * early_platform_driver_register - register early platform driver |
d86c1302 | 1218 | * @epdrv: early_platform driver structure |
13977091 | 1219 | * @buf: string passed from early_param() |
4d26e139 MD |
1220 | * |
1221 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
1222 | */ |
1223 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
1224 | char *buf) | |
1225 | { | |
c60e0504 | 1226 | char *tmp; |
13977091 MD |
1227 | int n; |
1228 | ||
1229 | /* Simply add the driver to the end of the global list. | |
1230 | * Drivers will by default be put on the list in compiled-in order. | |
1231 | */ | |
1232 | if (!epdrv->list.next) { | |
1233 | INIT_LIST_HEAD(&epdrv->list); | |
1234 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
1235 | } | |
1236 | ||
1237 | /* If the user has specified device then make sure the driver | |
1238 | * gets prioritized. The driver of the last device specified on | |
1239 | * command line will be put first on the list. | |
1240 | */ | |
1241 | n = strlen(epdrv->pdrv->driver.name); | |
1242 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
1243 | list_move(&epdrv->list, &early_platform_driver_list); | |
1244 | ||
c60e0504 MD |
1245 | /* Allow passing parameters after device name */ |
1246 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 1247 | epdrv->requested_id = -1; |
c60e0504 MD |
1248 | else { |
1249 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
1250 | &tmp, 10); | |
1251 | ||
1252 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
1253 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
1254 | n = 0; | |
1255 | } else | |
1256 | n += strcspn(&buf[n + 1], ",") + 1; | |
1257 | } | |
1258 | ||
1259 | if (buf[n] == ',') | |
1260 | n++; | |
1261 | ||
1262 | if (epdrv->bufsize) { | |
1263 | memcpy(epdrv->buffer, &buf[n], | |
1264 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
1265 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
1266 | } | |
13977091 MD |
1267 | } |
1268 | ||
1269 | return 0; | |
1270 | } | |
1271 | ||
1272 | /** | |
4d26e139 | 1273 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
1274 | * @devs: array of early platform devices to add |
1275 | * @num: number of early platform devices in array | |
4d26e139 MD |
1276 | * |
1277 | * Used by early architecture code to register early platform devices and | |
1278 | * their platform data. | |
13977091 MD |
1279 | */ |
1280 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1281 | { | |
1282 | struct device *dev; | |
1283 | int i; | |
1284 | ||
1285 | /* simply add the devices to list */ | |
1286 | for (i = 0; i < num; i++) { | |
1287 | dev = &devs[i]->dev; | |
1288 | ||
1289 | if (!dev->devres_head.next) { | |
bed2b42d | 1290 | pm_runtime_early_init(dev); |
13977091 MD |
1291 | INIT_LIST_HEAD(&dev->devres_head); |
1292 | list_add_tail(&dev->devres_head, | |
1293 | &early_platform_device_list); | |
1294 | } | |
1295 | } | |
1296 | } | |
1297 | ||
1298 | /** | |
4d26e139 | 1299 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 1300 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
1301 | * |
1302 | * Used by architecture code to register all early platform drivers | |
1303 | * for a certain class. If omitted then only early platform drivers | |
1304 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
1305 | */ |
1306 | void __init early_platform_driver_register_all(char *class_str) | |
1307 | { | |
1308 | /* The "class_str" parameter may or may not be present on the kernel | |
1309 | * command line. If it is present then there may be more than one | |
1310 | * matching parameter. | |
1311 | * | |
1312 | * Since we register our early platform drivers using early_param() | |
1313 | * we need to make sure that they also get registered in the case | |
1314 | * when the parameter is missing from the kernel command line. | |
1315 | * | |
1316 | * We use parse_early_options() to make sure the early_param() gets | |
1317 | * called at least once. The early_param() may be called more than | |
1318 | * once since the name of the preferred device may be specified on | |
1319 | * the kernel command line. early_platform_driver_register() handles | |
1320 | * this case for us. | |
1321 | */ | |
1322 | parse_early_options(class_str); | |
1323 | } | |
1324 | ||
1325 | /** | |
4d26e139 | 1326 | * early_platform_match - find early platform device matching driver |
d86c1302 | 1327 | * @epdrv: early platform driver structure |
13977091 MD |
1328 | * @id: id to match against |
1329 | */ | |
a8257910 | 1330 | static struct platform_device * __init |
13977091 MD |
1331 | early_platform_match(struct early_platform_driver *epdrv, int id) |
1332 | { | |
1333 | struct platform_device *pd; | |
1334 | ||
1335 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1336 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1337 | if (pd->id == id) | |
1338 | return pd; | |
1339 | ||
1340 | return NULL; | |
1341 | } | |
1342 | ||
1343 | /** | |
4d26e139 | 1344 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1345 | * @epdrv: early platform driver structure |
13977091 MD |
1346 | * @id: return true if id or above exists |
1347 | */ | |
a8257910 | 1348 | static int __init early_platform_left(struct early_platform_driver *epdrv, |
13977091 MD |
1349 | int id) |
1350 | { | |
1351 | struct platform_device *pd; | |
1352 | ||
1353 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1354 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1355 | if (pd->id >= id) | |
1356 | return 1; | |
1357 | ||
1358 | return 0; | |
1359 | } | |
1360 | ||
1361 | /** | |
4d26e139 | 1362 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1363 | * @class_str: string to identify early platform driver class |
1364 | * @id: id to match against | |
1365 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1366 | */ | |
1367 | static int __init early_platform_driver_probe_id(char *class_str, | |
1368 | int id, | |
1369 | int nr_probe) | |
1370 | { | |
1371 | struct early_platform_driver *epdrv; | |
1372 | struct platform_device *match; | |
1373 | int match_id; | |
1374 | int n = 0; | |
1375 | int left = 0; | |
1376 | ||
1377 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1378 | /* only use drivers matching our class_str */ | |
1379 | if (strcmp(class_str, epdrv->class_str)) | |
1380 | continue; | |
1381 | ||
1382 | if (id == -2) { | |
1383 | match_id = epdrv->requested_id; | |
1384 | left = 1; | |
1385 | ||
1386 | } else { | |
1387 | match_id = id; | |
1388 | left += early_platform_left(epdrv, id); | |
1389 | ||
1390 | /* skip requested id */ | |
1391 | switch (epdrv->requested_id) { | |
1392 | case EARLY_PLATFORM_ID_ERROR: | |
1393 | case EARLY_PLATFORM_ID_UNSET: | |
1394 | break; | |
1395 | default: | |
1396 | if (epdrv->requested_id == id) | |
1397 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1398 | } | |
1399 | } | |
1400 | ||
1401 | switch (match_id) { | |
1402 | case EARLY_PLATFORM_ID_ERROR: | |
0258e182 FP |
1403 | pr_warn("%s: unable to parse %s parameter\n", |
1404 | class_str, epdrv->pdrv->driver.name); | |
13977091 MD |
1405 | /* fall-through */ |
1406 | case EARLY_PLATFORM_ID_UNSET: | |
1407 | match = NULL; | |
1408 | break; | |
1409 | default: | |
1410 | match = early_platform_match(epdrv, match_id); | |
1411 | } | |
1412 | ||
1413 | if (match) { | |
a636ee7f PM |
1414 | /* |
1415 | * Set up a sensible init_name to enable | |
1416 | * dev_name() and others to be used before the | |
1417 | * rest of the driver core is initialized. | |
1418 | */ | |
06fe53be | 1419 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1420 | if (match->id != -1) |
bd05086b PM |
1421 | match->dev.init_name = |
1422 | kasprintf(GFP_KERNEL, "%s.%d", | |
1423 | match->name, | |
1424 | match->id); | |
a636ee7f | 1425 | else |
bd05086b PM |
1426 | match->dev.init_name = |
1427 | kasprintf(GFP_KERNEL, "%s", | |
1428 | match->name); | |
a636ee7f | 1429 | |
a636ee7f PM |
1430 | if (!match->dev.init_name) |
1431 | return -ENOMEM; | |
1432 | } | |
bd05086b | 1433 | |
13977091 | 1434 | if (epdrv->pdrv->probe(match)) |
0258e182 FP |
1435 | pr_warn("%s: unable to probe %s early.\n", |
1436 | class_str, match->name); | |
13977091 MD |
1437 | else |
1438 | n++; | |
1439 | } | |
1440 | ||
1441 | if (n >= nr_probe) | |
1442 | break; | |
1443 | } | |
1444 | ||
1445 | if (left) | |
1446 | return n; | |
1447 | else | |
1448 | return -ENODEV; | |
1449 | } | |
1450 | ||
1451 | /** | |
4d26e139 | 1452 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1453 | * @class_str: string to identify early platform driver class |
1454 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1455 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1456 | * |
1457 | * Used by architecture code to probe registered early platform drivers | |
1458 | * within a certain class. For probe to happen a registered early platform | |
1459 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1460 | */ |
1461 | int __init early_platform_driver_probe(char *class_str, | |
1462 | int nr_probe, | |
1463 | int user_only) | |
1464 | { | |
1465 | int k, n, i; | |
1466 | ||
1467 | n = 0; | |
1468 | for (i = -2; n < nr_probe; i++) { | |
1469 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1470 | ||
1471 | if (k < 0) | |
1472 | break; | |
1473 | ||
1474 | n += k; | |
1475 | ||
1476 | if (user_only) | |
1477 | break; | |
1478 | } | |
1479 | ||
1480 | return n; | |
1481 | } | |
1482 | ||
1483 | /** | |
1484 | * early_platform_cleanup - clean up early platform code | |
1485 | */ | |
1486 | void __init early_platform_cleanup(void) | |
1487 | { | |
1488 | struct platform_device *pd, *pd2; | |
1489 | ||
1490 | /* clean up the devres list used to chain devices */ | |
1491 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1492 | dev.devres_head) { | |
1493 | list_del(&pd->dev.devres_head); | |
1494 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1495 | } | |
1496 | } | |
1497 |