Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * platform.c - platform 'pseudo' bus for legacy devices | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * Please see Documentation/driver-model/platform.txt for more | |
10 | * information. | |
11 | */ | |
12 | ||
daa41226 | 13 | #include <linux/string.h> |
d052d1be | 14 | #include <linux/platform_device.h> |
05212157 | 15 | #include <linux/of_device.h> |
9ec36caf | 16 | #include <linux/of_irq.h> |
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/init.h> | |
19 | #include <linux/dma-mapping.h> | |
20 | #include <linux/bootmem.h> | |
21 | #include <linux/err.h> | |
4e57b681 | 22 | #include <linux/slab.h> |
9d730229 | 23 | #include <linux/pm_runtime.h> |
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> |
1da177e4 | 28 | |
a1bdc7aa | 29 | #include "base.h" |
bed2b42d | 30 | #include "power/power.h" |
a1bdc7aa | 31 | |
689ae231 JD |
32 | /* For automatically allocated device IDs */ |
33 | static DEFINE_IDA(platform_devid_ida); | |
34 | ||
1da177e4 | 35 | struct device platform_bus = { |
1e0b2cf9 | 36 | .init_name = "platform", |
1da177e4 | 37 | }; |
a96b2042 | 38 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 | 39 | |
a77ce816 KG |
40 | /** |
41 | * arch_setup_pdev_archdata - Allow manipulation of archdata before its used | |
7de636fa | 42 | * @pdev: platform device |
a77ce816 KG |
43 | * |
44 | * This is called before platform_device_add() such that any pdev_archdata may | |
45 | * be setup before the platform_notifier is called. So if a user needs to | |
46 | * manipulate any relevant information in the pdev_archdata they can do: | |
47 | * | |
b1d6d822 | 48 | * platform_device_alloc() |
0258e182 FP |
49 | * ... manipulate ... |
50 | * platform_device_add() | |
a77ce816 KG |
51 | * |
52 | * And if they don't care they can just call platform_device_register() and | |
53 | * everything will just work out. | |
54 | */ | |
55 | void __weak arch_setup_pdev_archdata(struct platform_device *pdev) | |
56 | { | |
57 | } | |
58 | ||
1da177e4 | 59 | /** |
4a3ad20c GKH |
60 | * platform_get_resource - get a resource for a device |
61 | * @dev: platform device | |
62 | * @type: resource type | |
63 | * @num: resource index | |
1da177e4 | 64 | */ |
4a3ad20c GKH |
65 | struct resource *platform_get_resource(struct platform_device *dev, |
66 | unsigned int type, unsigned int num) | |
1da177e4 LT |
67 | { |
68 | int i; | |
69 | ||
70 | for (i = 0; i < dev->num_resources; i++) { | |
71 | struct resource *r = &dev->resource[i]; | |
72 | ||
c9f66169 MD |
73 | if (type == resource_type(r) && num-- == 0) |
74 | return r; | |
1da177e4 LT |
75 | } |
76 | return NULL; | |
77 | } | |
a96b2042 | 78 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
79 | |
80 | /** | |
4a3ad20c GKH |
81 | * platform_get_irq - get an IRQ for a device |
82 | * @dev: platform device | |
83 | * @num: IRQ number index | |
1da177e4 LT |
84 | */ |
85 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
86 | { | |
5cf8f7db AL |
87 | #ifdef CONFIG_SPARC |
88 | /* sparc does not have irqs represented as IORESOURCE_IRQ resources */ | |
89 | if (!dev || num >= dev->archdata.num_irqs) | |
90 | return -ENXIO; | |
91 | return dev->archdata.irqs[num]; | |
92 | #else | |
9ec36caf | 93 | struct resource *r; |
aff008ad GR |
94 | if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) { |
95 | int ret; | |
96 | ||
97 | ret = of_irq_get(dev->dev.of_node, num); | |
98 | if (ret >= 0 || ret == -EPROBE_DEFER) | |
99 | return ret; | |
100 | } | |
9ec36caf RH |
101 | |
102 | r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
1da177e4 | 103 | |
305b3228 | 104 | return r ? r->start : -ENXIO; |
5cf8f7db | 105 | #endif |
1da177e4 | 106 | } |
a96b2042 | 107 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
108 | |
109 | /** | |
4a3ad20c GKH |
110 | * platform_get_resource_byname - get a resource for a device by name |
111 | * @dev: platform device | |
112 | * @type: resource type | |
113 | * @name: resource name | |
1da177e4 | 114 | */ |
4a3ad20c | 115 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
116 | unsigned int type, |
117 | const char *name) | |
1da177e4 LT |
118 | { |
119 | int i; | |
120 | ||
121 | for (i = 0; i < dev->num_resources; i++) { | |
122 | struct resource *r = &dev->resource[i]; | |
123 | ||
1b8cb929 PU |
124 | if (unlikely(!r->name)) |
125 | continue; | |
126 | ||
c9f66169 MD |
127 | if (type == resource_type(r) && !strcmp(r->name, name)) |
128 | return r; | |
1da177e4 LT |
129 | } |
130 | return NULL; | |
131 | } | |
a96b2042 | 132 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
133 | |
134 | /** | |
d6ff8551 | 135 | * platform_get_irq_byname - get an IRQ for a device by name |
4a3ad20c GKH |
136 | * @dev: platform device |
137 | * @name: IRQ name | |
1da177e4 | 138 | */ |
c0afe7ba | 139 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
1da177e4 | 140 | { |
ad69674e GS |
141 | struct resource *r; |
142 | ||
aff008ad GR |
143 | if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) { |
144 | int ret; | |
145 | ||
146 | ret = of_irq_get_byname(dev->dev.of_node, name); | |
147 | if (ret >= 0 || ret == -EPROBE_DEFER) | |
148 | return ret; | |
149 | } | |
1da177e4 | 150 | |
ad69674e | 151 | r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name); |
305b3228 | 152 | return r ? r->start : -ENXIO; |
1da177e4 | 153 | } |
a96b2042 | 154 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
155 | |
156 | /** | |
4a3ad20c GKH |
157 | * platform_add_devices - add a numbers of platform devices |
158 | * @devs: array of platform devices to add | |
159 | * @num: number of platform devices in array | |
1da177e4 LT |
160 | */ |
161 | int platform_add_devices(struct platform_device **devs, int num) | |
162 | { | |
163 | int i, ret = 0; | |
164 | ||
165 | for (i = 0; i < num; i++) { | |
166 | ret = platform_device_register(devs[i]); | |
167 | if (ret) { | |
168 | while (--i >= 0) | |
169 | platform_device_unregister(devs[i]); | |
170 | break; | |
171 | } | |
172 | } | |
173 | ||
174 | return ret; | |
175 | } | |
a96b2042 | 176 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 177 | |
37c12e74 RK |
178 | struct platform_object { |
179 | struct platform_device pdev; | |
1cec24c5 | 180 | char name[]; |
37c12e74 RK |
181 | }; |
182 | ||
1da177e4 | 183 | /** |
3c31f07a | 184 | * platform_device_put - destroy a platform device |
4a3ad20c | 185 | * @pdev: platform device to free |
37c12e74 | 186 | * |
4a3ad20c GKH |
187 | * Free all memory associated with a platform device. This function must |
188 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
189 | */ |
190 | void platform_device_put(struct platform_device *pdev) | |
191 | { | |
192 | if (pdev) | |
193 | put_device(&pdev->dev); | |
194 | } | |
195 | EXPORT_SYMBOL_GPL(platform_device_put); | |
196 | ||
197 | static void platform_device_release(struct device *dev) | |
198 | { | |
4a3ad20c GKH |
199 | struct platform_object *pa = container_of(dev, struct platform_object, |
200 | pdev.dev); | |
37c12e74 | 201 | |
7096d042 | 202 | of_device_node_put(&pa->pdev.dev); |
37c12e74 | 203 | kfree(pa->pdev.dev.platform_data); |
e710d7d5 | 204 | kfree(pa->pdev.mfd_cell); |
37c12e74 | 205 | kfree(pa->pdev.resource); |
3d713e0e | 206 | kfree(pa->pdev.driver_override); |
37c12e74 RK |
207 | kfree(pa); |
208 | } | |
209 | ||
210 | /** | |
3c31f07a | 211 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
212 | * @name: base name of the device we're adding |
213 | * @id: instance id | |
37c12e74 | 214 | * |
4a3ad20c GKH |
215 | * Create a platform device object which can have other objects attached |
216 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 217 | */ |
1359555e | 218 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
219 | { |
220 | struct platform_object *pa; | |
221 | ||
1cec24c5 | 222 | pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL); |
37c12e74 RK |
223 | if (pa) { |
224 | strcpy(pa->name, name); | |
225 | pa->pdev.name = pa->name; | |
226 | pa->pdev.id = id; | |
227 | device_initialize(&pa->pdev.dev); | |
228 | pa->pdev.dev.release = platform_device_release; | |
a77ce816 | 229 | arch_setup_pdev_archdata(&pa->pdev); |
37c12e74 RK |
230 | } |
231 | ||
93ce3061 | 232 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
233 | } |
234 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
235 | ||
236 | /** | |
3c31f07a | 237 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
238 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
239 | * @res: set of resources that needs to be allocated for the device | |
240 | * @num: number of resources | |
37c12e74 | 241 | * |
4a3ad20c GKH |
242 | * Add a copy of the resources to the platform device. The memory |
243 | * associated with the resources will be freed when the platform device is | |
244 | * released. | |
37c12e74 | 245 | */ |
4a3ad20c | 246 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 247 | const struct resource *res, unsigned int num) |
37c12e74 | 248 | { |
cea89623 | 249 | struct resource *r = NULL; |
37c12e74 | 250 | |
cea89623 UKK |
251 | if (res) { |
252 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); | |
253 | if (!r) | |
254 | return -ENOMEM; | |
37c12e74 | 255 | } |
cea89623 | 256 | |
4a03d6f7 | 257 | kfree(pdev->resource); |
cea89623 UKK |
258 | pdev->resource = r; |
259 | pdev->num_resources = num; | |
260 | return 0; | |
37c12e74 RK |
261 | } |
262 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
263 | ||
264 | /** | |
3c31f07a | 265 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
266 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
267 | * @data: platform specific data for this platform device | |
268 | * @size: size of platform specific data | |
37c12e74 | 269 | * |
4a3ad20c GKH |
270 | * Add a copy of platform specific data to the platform device's |
271 | * platform_data pointer. The memory associated with the platform data | |
272 | * will be freed when the platform device is released. | |
37c12e74 | 273 | */ |
4a3ad20c GKH |
274 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
275 | size_t size) | |
37c12e74 | 276 | { |
27a33f9e | 277 | void *d = NULL; |
5cfc64ce | 278 | |
27a33f9e UKK |
279 | if (data) { |
280 | d = kmemdup(data, size, GFP_KERNEL); | |
281 | if (!d) | |
282 | return -ENOMEM; | |
37c12e74 | 283 | } |
27a33f9e | 284 | |
251e031d | 285 | kfree(pdev->dev.platform_data); |
27a33f9e UKK |
286 | pdev->dev.platform_data = d; |
287 | return 0; | |
37c12e74 RK |
288 | } |
289 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
290 | ||
291 | /** | |
4a3ad20c GKH |
292 | * platform_device_add - add a platform device to device hierarchy |
293 | * @pdev: platform device we're adding | |
1da177e4 | 294 | * |
4a3ad20c GKH |
295 | * This is part 2 of platform_device_register(), though may be called |
296 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 297 | */ |
37c12e74 | 298 | int platform_device_add(struct platform_device *pdev) |
1da177e4 | 299 | { |
689ae231 | 300 | int i, ret; |
1da177e4 LT |
301 | |
302 | if (!pdev) | |
303 | return -EINVAL; | |
304 | ||
305 | if (!pdev->dev.parent) | |
306 | pdev->dev.parent = &platform_bus; | |
307 | ||
308 | pdev->dev.bus = &platform_bus_type; | |
309 | ||
689ae231 JD |
310 | switch (pdev->id) { |
311 | default: | |
1e0b2cf9 | 312 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
689ae231 JD |
313 | break; |
314 | case PLATFORM_DEVID_NONE: | |
acc0e90f | 315 | dev_set_name(&pdev->dev, "%s", pdev->name); |
689ae231 JD |
316 | break; |
317 | case PLATFORM_DEVID_AUTO: | |
318 | /* | |
319 | * Automatically allocated device ID. We mark it as such so | |
320 | * that we remember it must be freed, and we append a suffix | |
321 | * to avoid namespace collision with explicit IDs. | |
322 | */ | |
323 | ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL); | |
324 | if (ret < 0) | |
325 | goto err_out; | |
326 | pdev->id = ret; | |
327 | pdev->id_auto = true; | |
328 | dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); | |
329 | break; | |
330 | } | |
1da177e4 LT |
331 | |
332 | for (i = 0; i < pdev->num_resources; i++) { | |
333 | struct resource *p, *r = &pdev->resource[i]; | |
334 | ||
335 | if (r->name == NULL) | |
1e0b2cf9 | 336 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
337 | |
338 | p = r->parent; | |
339 | if (!p) { | |
c9f66169 | 340 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 341 | p = &iomem_resource; |
c9f66169 | 342 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
343 | p = &ioport_resource; |
344 | } | |
345 | ||
d960bb4d | 346 | if (p && insert_resource(p, r)) { |
0258e182 | 347 | dev_err(&pdev->dev, "failed to claim resource %d\n", i); |
1da177e4 LT |
348 | ret = -EBUSY; |
349 | goto failed; | |
350 | } | |
351 | } | |
352 | ||
353 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 354 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 355 | |
e3915532 | 356 | ret = device_add(&pdev->dev); |
1da177e4 LT |
357 | if (ret == 0) |
358 | return ret; | |
359 | ||
360 | failed: | |
689ae231 JD |
361 | if (pdev->id_auto) { |
362 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
363 | pdev->id = PLATFORM_DEVID_AUTO; | |
364 | } | |
365 | ||
c9f66169 MD |
366 | while (--i >= 0) { |
367 | struct resource *r = &pdev->resource[i]; | |
368 | unsigned long type = resource_type(r); | |
369 | ||
370 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
371 | release_resource(r); | |
372 | } | |
373 | ||
689ae231 | 374 | err_out: |
1da177e4 LT |
375 | return ret; |
376 | } | |
37c12e74 RK |
377 | EXPORT_SYMBOL_GPL(platform_device_add); |
378 | ||
379 | /** | |
4a3ad20c GKH |
380 | * platform_device_del - remove a platform-level device |
381 | * @pdev: platform device we're removing | |
1da177e4 | 382 | * |
4a3ad20c GKH |
383 | * Note that this function will also release all memory- and port-based |
384 | * resources owned by the device (@dev->resource). This function must | |
385 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 386 | */ |
93ce3061 | 387 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
388 | { |
389 | int i; | |
390 | ||
391 | if (pdev) { | |
dc4c15d4 JD |
392 | device_del(&pdev->dev); |
393 | ||
689ae231 JD |
394 | if (pdev->id_auto) { |
395 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
396 | pdev->id = PLATFORM_DEVID_AUTO; | |
397 | } | |
398 | ||
1da177e4 LT |
399 | for (i = 0; i < pdev->num_resources; i++) { |
400 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
401 | unsigned long type = resource_type(r); |
402 | ||
403 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
404 | release_resource(r); |
405 | } | |
1da177e4 LT |
406 | } |
407 | } | |
93ce3061 DT |
408 | EXPORT_SYMBOL_GPL(platform_device_del); |
409 | ||
410 | /** | |
4a3ad20c GKH |
411 | * platform_device_register - add a platform-level device |
412 | * @pdev: platform device we're adding | |
93ce3061 | 413 | */ |
4a3ad20c | 414 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
415 | { |
416 | device_initialize(&pdev->dev); | |
a77ce816 | 417 | arch_setup_pdev_archdata(pdev); |
93ce3061 DT |
418 | return platform_device_add(pdev); |
419 | } | |
a96b2042 | 420 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
421 | |
422 | /** | |
4a3ad20c GKH |
423 | * platform_device_unregister - unregister a platform-level device |
424 | * @pdev: platform device we're unregistering | |
93ce3061 | 425 | * |
4a3ad20c GKH |
426 | * Unregistration is done in 2 steps. First we release all resources |
427 | * and remove it from the subsystem, then we drop reference count by | |
428 | * calling platform_device_put(). | |
93ce3061 | 429 | */ |
4a3ad20c | 430 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
431 | { |
432 | platform_device_del(pdev); | |
433 | platform_device_put(pdev); | |
434 | } | |
a96b2042 | 435 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 436 | |
1da177e4 | 437 | /** |
01dcc60a | 438 | * platform_device_register_full - add a platform-level device with |
44f28bde | 439 | * resources and platform-specific data |
49a4ec18 | 440 | * |
01dcc60a | 441 | * @pdevinfo: data used to create device |
d8bf2540 | 442 | * |
f0eae0ed | 443 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 444 | */ |
01dcc60a | 445 | struct platform_device *platform_device_register_full( |
5a3072be | 446 | const struct platform_device_info *pdevinfo) |
d8bf2540 | 447 | { |
44f28bde | 448 | int ret = -ENOMEM; |
d8bf2540 | 449 | struct platform_device *pdev; |
d8bf2540 | 450 | |
01dcc60a | 451 | pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
44f28bde | 452 | if (!pdev) |
01dcc60a UKK |
453 | goto err_alloc; |
454 | ||
455 | pdev->dev.parent = pdevinfo->parent; | |
7b199811 | 456 | ACPI_COMPANION_SET(&pdev->dev, pdevinfo->acpi_node.companion); |
01dcc60a UKK |
457 | |
458 | if (pdevinfo->dma_mask) { | |
459 | /* | |
460 | * This memory isn't freed when the device is put, | |
461 | * I don't have a nice idea for that though. Conceptually | |
462 | * dma_mask in struct device should not be a pointer. | |
463 | * See http://thread.gmane.org/gmane.linux.kernel.pci/9081 | |
464 | */ | |
465 | pdev->dev.dma_mask = | |
466 | kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); | |
467 | if (!pdev->dev.dma_mask) | |
468 | goto err; | |
469 | ||
470 | *pdev->dev.dma_mask = pdevinfo->dma_mask; | |
471 | pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; | |
472 | } | |
d8bf2540 | 473 | |
01dcc60a UKK |
474 | ret = platform_device_add_resources(pdev, |
475 | pdevinfo->res, pdevinfo->num_res); | |
807508c8 AV |
476 | if (ret) |
477 | goto err; | |
44f28bde | 478 | |
01dcc60a UKK |
479 | ret = platform_device_add_data(pdev, |
480 | pdevinfo->data, pdevinfo->size_data); | |
807508c8 AV |
481 | if (ret) |
482 | goto err; | |
d8bf2540 | 483 | |
44f28bde UKK |
484 | ret = platform_device_add(pdev); |
485 | if (ret) { | |
486 | err: | |
7b199811 | 487 | ACPI_COMPANION_SET(&pdev->dev, NULL); |
01dcc60a UKK |
488 | kfree(pdev->dev.dma_mask); |
489 | ||
490 | err_alloc: | |
44f28bde UKK |
491 | platform_device_put(pdev); |
492 | return ERR_PTR(ret); | |
493 | } | |
d8bf2540 DB |
494 | |
495 | return pdev; | |
d8bf2540 | 496 | } |
01dcc60a | 497 | EXPORT_SYMBOL_GPL(platform_device_register_full); |
d8bf2540 | 498 | |
00d3dcdd RK |
499 | static int platform_drv_probe(struct device *_dev) |
500 | { | |
501 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
502 | struct platform_device *dev = to_platform_device(_dev); | |
94d76d5d | 503 | int ret; |
00d3dcdd | 504 | |
86be408b SN |
505 | ret = of_clk_set_defaults(_dev->of_node, false); |
506 | if (ret < 0) | |
507 | return ret; | |
508 | ||
cb518413 UH |
509 | ret = dev_pm_domain_attach(_dev, true); |
510 | if (ret != -EPROBE_DEFER) { | |
511 | ret = drv->probe(dev); | |
512 | if (ret) | |
513 | dev_pm_domain_detach(_dev, true); | |
514 | } | |
94d76d5d | 515 | |
3f9120b0 JH |
516 | if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) { |
517 | dev_warn(_dev, "probe deferral not supported\n"); | |
518 | ret = -ENXIO; | |
519 | } | |
520 | ||
94d76d5d | 521 | return ret; |
00d3dcdd RK |
522 | } |
523 | ||
c67334fb DB |
524 | static int platform_drv_probe_fail(struct device *_dev) |
525 | { | |
526 | return -ENXIO; | |
527 | } | |
528 | ||
00d3dcdd RK |
529 | static int platform_drv_remove(struct device *_dev) |
530 | { | |
531 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
532 | struct platform_device *dev = to_platform_device(_dev); | |
94d76d5d | 533 | int ret; |
00d3dcdd | 534 | |
94d76d5d | 535 | ret = drv->remove(dev); |
cb518413 | 536 | dev_pm_domain_detach(_dev, true); |
94d76d5d RW |
537 | |
538 | return ret; | |
00d3dcdd RK |
539 | } |
540 | ||
541 | static void platform_drv_shutdown(struct device *_dev) | |
542 | { | |
543 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
544 | struct platform_device *dev = to_platform_device(_dev); | |
545 | ||
546 | drv->shutdown(dev); | |
cb518413 | 547 | dev_pm_domain_detach(_dev, true); |
00d3dcdd RK |
548 | } |
549 | ||
00d3dcdd | 550 | /** |
9447057e | 551 | * __platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 552 | * @drv: platform driver structure |
08801f96 | 553 | * @owner: owning module/driver |
00d3dcdd | 554 | */ |
9447057e LC |
555 | int __platform_driver_register(struct platform_driver *drv, |
556 | struct module *owner) | |
00d3dcdd | 557 | { |
9447057e | 558 | drv->driver.owner = owner; |
00d3dcdd RK |
559 | drv->driver.bus = &platform_bus_type; |
560 | if (drv->probe) | |
561 | drv->driver.probe = platform_drv_probe; | |
562 | if (drv->remove) | |
563 | drv->driver.remove = platform_drv_remove; | |
564 | if (drv->shutdown) | |
565 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 566 | |
00d3dcdd RK |
567 | return driver_register(&drv->driver); |
568 | } | |
9447057e | 569 | EXPORT_SYMBOL_GPL(__platform_driver_register); |
00d3dcdd RK |
570 | |
571 | /** | |
3c31f07a | 572 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 573 | * @drv: platform driver structure |
00d3dcdd RK |
574 | */ |
575 | void platform_driver_unregister(struct platform_driver *drv) | |
576 | { | |
577 | driver_unregister(&drv->driver); | |
578 | } | |
579 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
580 | ||
c67334fb DB |
581 | /** |
582 | * platform_driver_probe - register driver for non-hotpluggable device | |
583 | * @drv: platform driver structure | |
3f9120b0 | 584 | * @probe: the driver probe routine, probably from an __init section |
c67334fb DB |
585 | * |
586 | * Use this instead of platform_driver_register() when you know the device | |
587 | * is not hotpluggable and has already been registered, and you want to | |
588 | * remove its run-once probe() infrastructure from memory after the driver | |
589 | * has bound to the device. | |
590 | * | |
591 | * One typical use for this would be with drivers for controllers integrated | |
592 | * into system-on-chip processors, where the controller devices have been | |
593 | * configured as part of board setup. | |
594 | * | |
3f9120b0 | 595 | * Note that this is incompatible with deferred probing. |
647c86d0 | 596 | * |
c67334fb DB |
597 | * Returns zero if the driver registered and bound to a device, else returns |
598 | * a negative error code and with the driver not registered. | |
599 | */ | |
c63e0783 | 600 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
601 | int (*probe)(struct platform_device *)) |
602 | { | |
603 | int retval, code; | |
604 | ||
3f9120b0 JH |
605 | /* |
606 | * Prevent driver from requesting probe deferral to avoid further | |
607 | * futile probe attempts. | |
608 | */ | |
609 | drv->prevent_deferred_probe = true; | |
610 | ||
1a6f2a75 DT |
611 | /* make sure driver won't have bind/unbind attributes */ |
612 | drv->driver.suppress_bind_attrs = true; | |
613 | ||
c67334fb DB |
614 | /* temporary section violation during probe() */ |
615 | drv->probe = probe; | |
616 | retval = code = platform_driver_register(drv); | |
617 | ||
1a6f2a75 DT |
618 | /* |
619 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
620 | * the list of drivers in order to probe new devices. Check to see |
621 | * if the probe was successful, and make sure any forced probes of | |
622 | * new devices fail. | |
623 | */ | |
d79d3244 | 624 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb | 625 | drv->probe = NULL; |
e5dd1278 | 626 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
627 | retval = -ENODEV; |
628 | drv->driver.probe = platform_drv_probe_fail; | |
d79d3244 | 629 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
630 | |
631 | if (code != retval) | |
632 | platform_driver_unregister(drv); | |
633 | return retval; | |
634 | } | |
635 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 636 | |
ecdf6ceb DT |
637 | /** |
638 | * platform_create_bundle - register driver and create corresponding device | |
639 | * @driver: platform driver structure | |
640 | * @probe: the driver probe routine, probably from an __init section | |
641 | * @res: set of resources that needs to be allocated for the device | |
642 | * @n_res: number of resources | |
643 | * @data: platform specific data for this platform device | |
644 | * @size: size of platform specific data | |
645 | * | |
646 | * Use this in legacy-style modules that probe hardware directly and | |
647 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
648 | * |
649 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb DT |
650 | */ |
651 | struct platform_device * __init_or_module platform_create_bundle( | |
652 | struct platform_driver *driver, | |
653 | int (*probe)(struct platform_device *), | |
654 | struct resource *res, unsigned int n_res, | |
655 | const void *data, size_t size) | |
656 | { | |
657 | struct platform_device *pdev; | |
658 | int error; | |
659 | ||
660 | pdev = platform_device_alloc(driver->driver.name, -1); | |
661 | if (!pdev) { | |
662 | error = -ENOMEM; | |
663 | goto err_out; | |
664 | } | |
665 | ||
807508c8 AV |
666 | error = platform_device_add_resources(pdev, res, n_res); |
667 | if (error) | |
668 | goto err_pdev_put; | |
ecdf6ceb | 669 | |
807508c8 AV |
670 | error = platform_device_add_data(pdev, data, size); |
671 | if (error) | |
672 | goto err_pdev_put; | |
ecdf6ceb DT |
673 | |
674 | error = platform_device_add(pdev); | |
675 | if (error) | |
676 | goto err_pdev_put; | |
677 | ||
678 | error = platform_driver_probe(driver, probe); | |
679 | if (error) | |
680 | goto err_pdev_del; | |
681 | ||
682 | return pdev; | |
683 | ||
684 | err_pdev_del: | |
685 | platform_device_del(pdev); | |
686 | err_pdev_put: | |
687 | platform_device_put(pdev); | |
688 | err_out: | |
689 | return ERR_PTR(error); | |
690 | } | |
691 | EXPORT_SYMBOL_GPL(platform_create_bundle); | |
692 | ||
a0245f7a DB |
693 | /* modalias support enables more hands-off userspace setup: |
694 | * (a) environment variable lets new-style hotplug events work once system is | |
695 | * fully running: "modprobe $MODALIAS" | |
696 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
697 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
698 | */ | |
4a3ad20c GKH |
699 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
700 | char *buf) | |
a0245f7a DB |
701 | { |
702 | struct platform_device *pdev = to_platform_device(dev); | |
8c4ff6d0 ZR |
703 | int len; |
704 | ||
b9f73067 ZR |
705 | len = of_device_get_modalias(dev, buf, PAGE_SIZE -1); |
706 | if (len != -ENODEV) | |
707 | return len; | |
708 | ||
8c4ff6d0 ZR |
709 | len = acpi_device_modalias(dev, buf, PAGE_SIZE -1); |
710 | if (len != -ENODEV) | |
711 | return len; | |
712 | ||
713 | len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); | |
a0245f7a DB |
714 | |
715 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
716 | } | |
d06262e5 | 717 | static DEVICE_ATTR_RO(modalias); |
a0245f7a | 718 | |
3d713e0e KP |
719 | static ssize_t driver_override_store(struct device *dev, |
720 | struct device_attribute *attr, | |
721 | const char *buf, size_t count) | |
722 | { | |
723 | struct platform_device *pdev = to_platform_device(dev); | |
724 | char *driver_override, *old = pdev->driver_override, *cp; | |
725 | ||
726 | if (count > PATH_MAX) | |
727 | return -EINVAL; | |
728 | ||
729 | driver_override = kstrndup(buf, count, GFP_KERNEL); | |
730 | if (!driver_override) | |
731 | return -ENOMEM; | |
732 | ||
733 | cp = strchr(driver_override, '\n'); | |
734 | if (cp) | |
735 | *cp = '\0'; | |
736 | ||
737 | if (strlen(driver_override)) { | |
738 | pdev->driver_override = driver_override; | |
739 | } else { | |
740 | kfree(driver_override); | |
741 | pdev->driver_override = NULL; | |
742 | } | |
743 | ||
744 | kfree(old); | |
745 | ||
746 | return count; | |
747 | } | |
748 | ||
749 | static ssize_t driver_override_show(struct device *dev, | |
750 | struct device_attribute *attr, char *buf) | |
751 | { | |
752 | struct platform_device *pdev = to_platform_device(dev); | |
753 | ||
754 | return sprintf(buf, "%s\n", pdev->driver_override); | |
755 | } | |
756 | static DEVICE_ATTR_RW(driver_override); | |
757 | ||
758 | ||
d06262e5 GKH |
759 | static struct attribute *platform_dev_attrs[] = { |
760 | &dev_attr_modalias.attr, | |
3d713e0e | 761 | &dev_attr_driver_override.attr, |
d06262e5 | 762 | NULL, |
a0245f7a | 763 | }; |
d06262e5 | 764 | ATTRIBUTE_GROUPS(platform_dev); |
a0245f7a | 765 | |
7eff2e7a | 766 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
767 | { |
768 | struct platform_device *pdev = to_platform_device(dev); | |
eca39301 GL |
769 | int rc; |
770 | ||
771 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
0258e182 | 772 | rc = of_device_uevent_modalias(dev, env); |
eca39301 GL |
773 | if (rc != -ENODEV) |
774 | return rc; | |
a0245f7a | 775 | |
8c4ff6d0 ZR |
776 | rc = acpi_device_uevent_modalias(dev, env); |
777 | if (rc != -ENODEV) | |
778 | return rc; | |
779 | ||
57fee4a5 | 780 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
0a26813c | 781 | pdev->name); |
a0245f7a DB |
782 | return 0; |
783 | } | |
784 | ||
57fee4a5 | 785 | static const struct platform_device_id *platform_match_id( |
831fad2f | 786 | const struct platform_device_id *id, |
57fee4a5 EM |
787 | struct platform_device *pdev) |
788 | { | |
789 | while (id->name[0]) { | |
790 | if (strcmp(pdev->name, id->name) == 0) { | |
791 | pdev->id_entry = id; | |
792 | return id; | |
793 | } | |
794 | id++; | |
795 | } | |
796 | return NULL; | |
797 | } | |
798 | ||
1da177e4 | 799 | /** |
4a3ad20c GKH |
800 | * platform_match - bind platform device to platform driver. |
801 | * @dev: device. | |
802 | * @drv: driver. | |
1da177e4 | 803 | * |
4a3ad20c GKH |
804 | * Platform device IDs are assumed to be encoded like this: |
805 | * "<name><instance>", where <name> is a short description of the type of | |
806 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
807 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
808 | * "<name>". So, extract the <name> from the platform_device structure, | |
809 | * and compare it against the name of the driver. Return whether they match | |
810 | * or not. | |
1da177e4 | 811 | */ |
4a3ad20c | 812 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 813 | { |
71b3e0c1 | 814 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
815 | struct platform_driver *pdrv = to_platform_driver(drv); |
816 | ||
3d713e0e KP |
817 | /* When driver_override is set, only bind to the matching driver */ |
818 | if (pdev->driver_override) | |
819 | return !strcmp(pdev->driver_override, drv->name); | |
820 | ||
05212157 GL |
821 | /* Attempt an OF style match first */ |
822 | if (of_driver_match_device(dev, drv)) | |
823 | return 1; | |
824 | ||
91e56878 MW |
825 | /* Then try ACPI style match */ |
826 | if (acpi_driver_match_device(dev, drv)) | |
827 | return 1; | |
828 | ||
05212157 | 829 | /* Then try to match against the id table */ |
57fee4a5 EM |
830 | if (pdrv->id_table) |
831 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 832 | |
57fee4a5 | 833 | /* fall-back to driver name match */ |
1e0b2cf9 | 834 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
835 | } |
836 | ||
25e18499 RW |
837 | #ifdef CONFIG_PM_SLEEP |
838 | ||
839 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 840 | { |
783ea7d4 MD |
841 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
842 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
843 | int ret = 0; |
844 | ||
783ea7d4 MD |
845 | if (dev->driver && pdrv->suspend) |
846 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
847 | |
848 | return ret; | |
849 | } | |
850 | ||
25e18499 | 851 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 852 | { |
783ea7d4 MD |
853 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
854 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
855 | int ret = 0; |
856 | ||
783ea7d4 MD |
857 | if (dev->driver && pdrv->resume) |
858 | ret = pdrv->resume(pdev); | |
9480e307 | 859 | |
1da177e4 LT |
860 | return ret; |
861 | } | |
862 | ||
69c9dd1e | 863 | #endif /* CONFIG_PM_SLEEP */ |
9d730229 | 864 | |
25e18499 RW |
865 | #ifdef CONFIG_SUSPEND |
866 | ||
69c9dd1e | 867 | int platform_pm_suspend(struct device *dev) |
25e18499 RW |
868 | { |
869 | struct device_driver *drv = dev->driver; | |
870 | int ret = 0; | |
871 | ||
adf09493 RW |
872 | if (!drv) |
873 | return 0; | |
874 | ||
875 | if (drv->pm) { | |
25e18499 RW |
876 | if (drv->pm->suspend) |
877 | ret = drv->pm->suspend(dev); | |
878 | } else { | |
879 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
880 | } | |
881 | ||
882 | return ret; | |
883 | } | |
884 | ||
69c9dd1e | 885 | int platform_pm_resume(struct device *dev) |
25e18499 RW |
886 | { |
887 | struct device_driver *drv = dev->driver; | |
888 | int ret = 0; | |
889 | ||
adf09493 RW |
890 | if (!drv) |
891 | return 0; | |
892 | ||
893 | if (drv->pm) { | |
25e18499 RW |
894 | if (drv->pm->resume) |
895 | ret = drv->pm->resume(dev); | |
896 | } else { | |
897 | ret = platform_legacy_resume(dev); | |
898 | } | |
899 | ||
900 | return ret; | |
901 | } | |
902 | ||
69c9dd1e | 903 | #endif /* CONFIG_SUSPEND */ |
25e18499 | 904 | |
1f112cee | 905 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 | 906 | |
69c9dd1e | 907 | int platform_pm_freeze(struct device *dev) |
25e18499 RW |
908 | { |
909 | struct device_driver *drv = dev->driver; | |
910 | int ret = 0; | |
911 | ||
912 | if (!drv) | |
913 | return 0; | |
914 | ||
915 | if (drv->pm) { | |
916 | if (drv->pm->freeze) | |
917 | ret = drv->pm->freeze(dev); | |
918 | } else { | |
919 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
920 | } | |
921 | ||
922 | return ret; | |
923 | } | |
924 | ||
69c9dd1e | 925 | int platform_pm_thaw(struct device *dev) |
25e18499 RW |
926 | { |
927 | struct device_driver *drv = dev->driver; | |
928 | int ret = 0; | |
929 | ||
adf09493 RW |
930 | if (!drv) |
931 | return 0; | |
932 | ||
933 | if (drv->pm) { | |
25e18499 RW |
934 | if (drv->pm->thaw) |
935 | ret = drv->pm->thaw(dev); | |
936 | } else { | |
937 | ret = platform_legacy_resume(dev); | |
938 | } | |
939 | ||
940 | return ret; | |
941 | } | |
942 | ||
69c9dd1e | 943 | int platform_pm_poweroff(struct device *dev) |
25e18499 RW |
944 | { |
945 | struct device_driver *drv = dev->driver; | |
946 | int ret = 0; | |
947 | ||
adf09493 RW |
948 | if (!drv) |
949 | return 0; | |
950 | ||
951 | if (drv->pm) { | |
25e18499 RW |
952 | if (drv->pm->poweroff) |
953 | ret = drv->pm->poweroff(dev); | |
954 | } else { | |
955 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
956 | } | |
957 | ||
958 | return ret; | |
959 | } | |
960 | ||
69c9dd1e | 961 | int platform_pm_restore(struct device *dev) |
25e18499 RW |
962 | { |
963 | struct device_driver *drv = dev->driver; | |
964 | int ret = 0; | |
965 | ||
adf09493 RW |
966 | if (!drv) |
967 | return 0; | |
968 | ||
969 | if (drv->pm) { | |
25e18499 RW |
970 | if (drv->pm->restore) |
971 | ret = drv->pm->restore(dev); | |
972 | } else { | |
973 | ret = platform_legacy_resume(dev); | |
974 | } | |
975 | ||
976 | return ret; | |
977 | } | |
978 | ||
69c9dd1e | 979 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 980 | |
d9ab7716 | 981 | static const struct dev_pm_ops platform_dev_pm_ops = { |
8b313a38 RW |
982 | .runtime_suspend = pm_generic_runtime_suspend, |
983 | .runtime_resume = pm_generic_runtime_resume, | |
69c9dd1e | 984 | USE_PLATFORM_PM_SLEEP_OPS |
25e18499 RW |
985 | }; |
986 | ||
1da177e4 LT |
987 | struct bus_type platform_bus_type = { |
988 | .name = "platform", | |
d06262e5 | 989 | .dev_groups = platform_dev_groups, |
1da177e4 | 990 | .match = platform_match, |
a0245f7a | 991 | .uevent = platform_uevent, |
9d730229 | 992 | .pm = &platform_dev_pm_ops, |
1da177e4 | 993 | }; |
a96b2042 | 994 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
995 | |
996 | int __init platform_bus_init(void) | |
997 | { | |
fbfb1445 CH |
998 | int error; |
999 | ||
13977091 MD |
1000 | early_platform_cleanup(); |
1001 | ||
fbfb1445 CH |
1002 | error = device_register(&platform_bus); |
1003 | if (error) | |
1004 | return error; | |
1005 | error = bus_register(&platform_bus_type); | |
1006 | if (error) | |
1007 | device_unregister(&platform_bus); | |
1008 | return error; | |
1da177e4 LT |
1009 | } |
1010 | ||
1011 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
1012 | u64 dma_get_required_mask(struct device *dev) | |
1013 | { | |
1014 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
1015 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
1016 | u64 mask; | |
1017 | ||
1018 | if (!high_totalram) { | |
1019 | /* convert to mask just covering totalram */ | |
1020 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
1021 | low_totalram += low_totalram - 1; | |
1022 | mask = low_totalram; | |
1023 | } else { | |
1024 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
1025 | high_totalram += high_totalram - 1; | |
1026 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
1027 | } | |
e88a0c2c | 1028 | return mask; |
1da177e4 LT |
1029 | } |
1030 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
1031 | #endif | |
13977091 MD |
1032 | |
1033 | static __initdata LIST_HEAD(early_platform_driver_list); | |
1034 | static __initdata LIST_HEAD(early_platform_device_list); | |
1035 | ||
1036 | /** | |
4d26e139 | 1037 | * early_platform_driver_register - register early platform driver |
d86c1302 | 1038 | * @epdrv: early_platform driver structure |
13977091 | 1039 | * @buf: string passed from early_param() |
4d26e139 MD |
1040 | * |
1041 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
1042 | */ |
1043 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
1044 | char *buf) | |
1045 | { | |
c60e0504 | 1046 | char *tmp; |
13977091 MD |
1047 | int n; |
1048 | ||
1049 | /* Simply add the driver to the end of the global list. | |
1050 | * Drivers will by default be put on the list in compiled-in order. | |
1051 | */ | |
1052 | if (!epdrv->list.next) { | |
1053 | INIT_LIST_HEAD(&epdrv->list); | |
1054 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
1055 | } | |
1056 | ||
1057 | /* If the user has specified device then make sure the driver | |
1058 | * gets prioritized. The driver of the last device specified on | |
1059 | * command line will be put first on the list. | |
1060 | */ | |
1061 | n = strlen(epdrv->pdrv->driver.name); | |
1062 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
1063 | list_move(&epdrv->list, &early_platform_driver_list); | |
1064 | ||
c60e0504 MD |
1065 | /* Allow passing parameters after device name */ |
1066 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 1067 | epdrv->requested_id = -1; |
c60e0504 MD |
1068 | else { |
1069 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
1070 | &tmp, 10); | |
1071 | ||
1072 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
1073 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
1074 | n = 0; | |
1075 | } else | |
1076 | n += strcspn(&buf[n + 1], ",") + 1; | |
1077 | } | |
1078 | ||
1079 | if (buf[n] == ',') | |
1080 | n++; | |
1081 | ||
1082 | if (epdrv->bufsize) { | |
1083 | memcpy(epdrv->buffer, &buf[n], | |
1084 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
1085 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
1086 | } | |
13977091 MD |
1087 | } |
1088 | ||
1089 | return 0; | |
1090 | } | |
1091 | ||
1092 | /** | |
4d26e139 | 1093 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
1094 | * @devs: array of early platform devices to add |
1095 | * @num: number of early platform devices in array | |
4d26e139 MD |
1096 | * |
1097 | * Used by early architecture code to register early platform devices and | |
1098 | * their platform data. | |
13977091 MD |
1099 | */ |
1100 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1101 | { | |
1102 | struct device *dev; | |
1103 | int i; | |
1104 | ||
1105 | /* simply add the devices to list */ | |
1106 | for (i = 0; i < num; i++) { | |
1107 | dev = &devs[i]->dev; | |
1108 | ||
1109 | if (!dev->devres_head.next) { | |
bed2b42d | 1110 | pm_runtime_early_init(dev); |
13977091 MD |
1111 | INIT_LIST_HEAD(&dev->devres_head); |
1112 | list_add_tail(&dev->devres_head, | |
1113 | &early_platform_device_list); | |
1114 | } | |
1115 | } | |
1116 | } | |
1117 | ||
1118 | /** | |
4d26e139 | 1119 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 1120 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
1121 | * |
1122 | * Used by architecture code to register all early platform drivers | |
1123 | * for a certain class. If omitted then only early platform drivers | |
1124 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
1125 | */ |
1126 | void __init early_platform_driver_register_all(char *class_str) | |
1127 | { | |
1128 | /* The "class_str" parameter may or may not be present on the kernel | |
1129 | * command line. If it is present then there may be more than one | |
1130 | * matching parameter. | |
1131 | * | |
1132 | * Since we register our early platform drivers using early_param() | |
1133 | * we need to make sure that they also get registered in the case | |
1134 | * when the parameter is missing from the kernel command line. | |
1135 | * | |
1136 | * We use parse_early_options() to make sure the early_param() gets | |
1137 | * called at least once. The early_param() may be called more than | |
1138 | * once since the name of the preferred device may be specified on | |
1139 | * the kernel command line. early_platform_driver_register() handles | |
1140 | * this case for us. | |
1141 | */ | |
1142 | parse_early_options(class_str); | |
1143 | } | |
1144 | ||
1145 | /** | |
4d26e139 | 1146 | * early_platform_match - find early platform device matching driver |
d86c1302 | 1147 | * @epdrv: early platform driver structure |
13977091 MD |
1148 | * @id: id to match against |
1149 | */ | |
a8257910 | 1150 | static struct platform_device * __init |
13977091 MD |
1151 | early_platform_match(struct early_platform_driver *epdrv, int id) |
1152 | { | |
1153 | struct platform_device *pd; | |
1154 | ||
1155 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1156 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1157 | if (pd->id == id) | |
1158 | return pd; | |
1159 | ||
1160 | return NULL; | |
1161 | } | |
1162 | ||
1163 | /** | |
4d26e139 | 1164 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1165 | * @epdrv: early platform driver structure |
13977091 MD |
1166 | * @id: return true if id or above exists |
1167 | */ | |
a8257910 | 1168 | static int __init early_platform_left(struct early_platform_driver *epdrv, |
13977091 MD |
1169 | int id) |
1170 | { | |
1171 | struct platform_device *pd; | |
1172 | ||
1173 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1174 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1175 | if (pd->id >= id) | |
1176 | return 1; | |
1177 | ||
1178 | return 0; | |
1179 | } | |
1180 | ||
1181 | /** | |
4d26e139 | 1182 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1183 | * @class_str: string to identify early platform driver class |
1184 | * @id: id to match against | |
1185 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1186 | */ | |
1187 | static int __init early_platform_driver_probe_id(char *class_str, | |
1188 | int id, | |
1189 | int nr_probe) | |
1190 | { | |
1191 | struct early_platform_driver *epdrv; | |
1192 | struct platform_device *match; | |
1193 | int match_id; | |
1194 | int n = 0; | |
1195 | int left = 0; | |
1196 | ||
1197 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1198 | /* only use drivers matching our class_str */ | |
1199 | if (strcmp(class_str, epdrv->class_str)) | |
1200 | continue; | |
1201 | ||
1202 | if (id == -2) { | |
1203 | match_id = epdrv->requested_id; | |
1204 | left = 1; | |
1205 | ||
1206 | } else { | |
1207 | match_id = id; | |
1208 | left += early_platform_left(epdrv, id); | |
1209 | ||
1210 | /* skip requested id */ | |
1211 | switch (epdrv->requested_id) { | |
1212 | case EARLY_PLATFORM_ID_ERROR: | |
1213 | case EARLY_PLATFORM_ID_UNSET: | |
1214 | break; | |
1215 | default: | |
1216 | if (epdrv->requested_id == id) | |
1217 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1218 | } | |
1219 | } | |
1220 | ||
1221 | switch (match_id) { | |
1222 | case EARLY_PLATFORM_ID_ERROR: | |
0258e182 FP |
1223 | pr_warn("%s: unable to parse %s parameter\n", |
1224 | class_str, epdrv->pdrv->driver.name); | |
13977091 MD |
1225 | /* fall-through */ |
1226 | case EARLY_PLATFORM_ID_UNSET: | |
1227 | match = NULL; | |
1228 | break; | |
1229 | default: | |
1230 | match = early_platform_match(epdrv, match_id); | |
1231 | } | |
1232 | ||
1233 | if (match) { | |
a636ee7f PM |
1234 | /* |
1235 | * Set up a sensible init_name to enable | |
1236 | * dev_name() and others to be used before the | |
1237 | * rest of the driver core is initialized. | |
1238 | */ | |
06fe53be | 1239 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1240 | if (match->id != -1) |
bd05086b PM |
1241 | match->dev.init_name = |
1242 | kasprintf(GFP_KERNEL, "%s.%d", | |
1243 | match->name, | |
1244 | match->id); | |
a636ee7f | 1245 | else |
bd05086b PM |
1246 | match->dev.init_name = |
1247 | kasprintf(GFP_KERNEL, "%s", | |
1248 | match->name); | |
a636ee7f | 1249 | |
a636ee7f PM |
1250 | if (!match->dev.init_name) |
1251 | return -ENOMEM; | |
1252 | } | |
bd05086b | 1253 | |
13977091 | 1254 | if (epdrv->pdrv->probe(match)) |
0258e182 FP |
1255 | pr_warn("%s: unable to probe %s early.\n", |
1256 | class_str, match->name); | |
13977091 MD |
1257 | else |
1258 | n++; | |
1259 | } | |
1260 | ||
1261 | if (n >= nr_probe) | |
1262 | break; | |
1263 | } | |
1264 | ||
1265 | if (left) | |
1266 | return n; | |
1267 | else | |
1268 | return -ENODEV; | |
1269 | } | |
1270 | ||
1271 | /** | |
4d26e139 | 1272 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1273 | * @class_str: string to identify early platform driver class |
1274 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1275 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1276 | * |
1277 | * Used by architecture code to probe registered early platform drivers | |
1278 | * within a certain class. For probe to happen a registered early platform | |
1279 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1280 | */ |
1281 | int __init early_platform_driver_probe(char *class_str, | |
1282 | int nr_probe, | |
1283 | int user_only) | |
1284 | { | |
1285 | int k, n, i; | |
1286 | ||
1287 | n = 0; | |
1288 | for (i = -2; n < nr_probe; i++) { | |
1289 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1290 | ||
1291 | if (k < 0) | |
1292 | break; | |
1293 | ||
1294 | n += k; | |
1295 | ||
1296 | if (user_only) | |
1297 | break; | |
1298 | } | |
1299 | ||
1300 | return n; | |
1301 | } | |
1302 | ||
1303 | /** | |
1304 | * early_platform_cleanup - clean up early platform code | |
1305 | */ | |
1306 | void __init early_platform_cleanup(void) | |
1307 | { | |
1308 | struct platform_device *pd, *pd2; | |
1309 | ||
1310 | /* clean up the devres list used to chain devices */ | |
1311 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1312 | dev.devres_head) { | |
1313 | list_del(&pd->dev.devres_head); | |
1314 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1315 | } | |
1316 | } | |
1317 |