| 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 | |
| 13 | #include <linux/string.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/of_device.h> |
| 16 | #include <linux/of_irq.h> |
| 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> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/pm_runtime.h> |
| 24 | #include <linux/pm_domain.h> |
| 25 | #include <linux/idr.h> |
| 26 | #include <linux/acpi.h> |
| 27 | #include <linux/clk/clk-conf.h> |
| 28 | #include <linux/limits.h> |
| 29 | #include <linux/property.h> |
| 30 | |
| 31 | #include "base.h" |
| 32 | #include "power/power.h" |
| 33 | |
| 34 | /* For automatically allocated device IDs */ |
| 35 | static DEFINE_IDA(platform_devid_ida); |
| 36 | |
| 37 | struct device platform_bus = { |
| 38 | .init_name = "platform", |
| 39 | }; |
| 40 | EXPORT_SYMBOL_GPL(platform_bus); |
| 41 | |
| 42 | /** |
| 43 | * arch_setup_pdev_archdata - Allow manipulation of archdata before its used |
| 44 | * @pdev: platform device |
| 45 | * |
| 46 | * This is called before platform_device_add() such that any pdev_archdata may |
| 47 | * be setup before the platform_notifier is called. So if a user needs to |
| 48 | * manipulate any relevant information in the pdev_archdata they can do: |
| 49 | * |
| 50 | * platform_device_alloc() |
| 51 | * ... manipulate ... |
| 52 | * platform_device_add() |
| 53 | * |
| 54 | * And if they don't care they can just call platform_device_register() and |
| 55 | * everything will just work out. |
| 56 | */ |
| 57 | void __weak arch_setup_pdev_archdata(struct platform_device *pdev) |
| 58 | { |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * platform_get_resource - get a resource for a device |
| 63 | * @dev: platform device |
| 64 | * @type: resource type |
| 65 | * @num: resource index |
| 66 | */ |
| 67 | struct resource *platform_get_resource(struct platform_device *dev, |
| 68 | unsigned int type, unsigned int num) |
| 69 | { |
| 70 | int i; |
| 71 | |
| 72 | for (i = 0; i < dev->num_resources; i++) { |
| 73 | struct resource *r = &dev->resource[i]; |
| 74 | |
| 75 | if (type == resource_type(r) && num-- == 0) |
| 76 | return r; |
| 77 | } |
| 78 | return NULL; |
| 79 | } |
| 80 | EXPORT_SYMBOL_GPL(platform_get_resource); |
| 81 | |
| 82 | /** |
| 83 | * platform_get_irq - get an IRQ for a device |
| 84 | * @dev: platform device |
| 85 | * @num: IRQ number index |
| 86 | */ |
| 87 | int platform_get_irq(struct platform_device *dev, unsigned int num) |
| 88 | { |
| 89 | #ifdef CONFIG_SPARC |
| 90 | /* sparc does not have irqs represented as IORESOURCE_IRQ resources */ |
| 91 | if (!dev || num >= dev->archdata.num_irqs) |
| 92 | return -ENXIO; |
| 93 | return dev->archdata.irqs[num]; |
| 94 | #else |
| 95 | struct resource *r; |
| 96 | if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) { |
| 97 | int ret; |
| 98 | |
| 99 | ret = of_irq_get(dev->dev.of_node, num); |
| 100 | if (ret >= 0 || ret == -EPROBE_DEFER) |
| 101 | return ret; |
| 102 | } |
| 103 | |
| 104 | r = platform_get_resource(dev, IORESOURCE_IRQ, num); |
| 105 | /* |
| 106 | * The resources may pass trigger flags to the irqs that need |
| 107 | * to be set up. It so happens that the trigger flags for |
| 108 | * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER* |
| 109 | * settings. |
| 110 | */ |
| 111 | if (r && r->flags & IORESOURCE_BITS) |
| 112 | irqd_set_trigger_type(irq_get_irq_data(r->start), |
| 113 | r->flags & IORESOURCE_BITS); |
| 114 | |
| 115 | return r ? r->start : -ENXIO; |
| 116 | #endif |
| 117 | } |
| 118 | EXPORT_SYMBOL_GPL(platform_get_irq); |
| 119 | |
| 120 | /** |
| 121 | * platform_irq_count - Count the number of IRQs a platform device uses |
| 122 | * @dev: platform device |
| 123 | * |
| 124 | * Return: Number of IRQs a platform device uses or EPROBE_DEFER |
| 125 | */ |
| 126 | int platform_irq_count(struct platform_device *dev) |
| 127 | { |
| 128 | int ret, nr = 0; |
| 129 | |
| 130 | while ((ret = platform_get_irq(dev, nr)) >= 0) |
| 131 | nr++; |
| 132 | |
| 133 | if (ret == -EPROBE_DEFER) |
| 134 | return ret; |
| 135 | |
| 136 | return nr; |
| 137 | } |
| 138 | EXPORT_SYMBOL_GPL(platform_irq_count); |
| 139 | |
| 140 | /** |
| 141 | * platform_get_resource_byname - get a resource for a device by name |
| 142 | * @dev: platform device |
| 143 | * @type: resource type |
| 144 | * @name: resource name |
| 145 | */ |
| 146 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
| 147 | unsigned int type, |
| 148 | const char *name) |
| 149 | { |
| 150 | int i; |
| 151 | |
| 152 | for (i = 0; i < dev->num_resources; i++) { |
| 153 | struct resource *r = &dev->resource[i]; |
| 154 | |
| 155 | if (unlikely(!r->name)) |
| 156 | continue; |
| 157 | |
| 158 | if (type == resource_type(r) && !strcmp(r->name, name)) |
| 159 | return r; |
| 160 | } |
| 161 | return NULL; |
| 162 | } |
| 163 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
| 164 | |
| 165 | /** |
| 166 | * platform_get_irq_byname - get an IRQ for a device by name |
| 167 | * @dev: platform device |
| 168 | * @name: IRQ name |
| 169 | */ |
| 170 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
| 171 | { |
| 172 | struct resource *r; |
| 173 | |
| 174 | if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) { |
| 175 | int ret; |
| 176 | |
| 177 | ret = of_irq_get_byname(dev->dev.of_node, name); |
| 178 | if (ret >= 0 || ret == -EPROBE_DEFER) |
| 179 | return ret; |
| 180 | } |
| 181 | |
| 182 | r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name); |
| 183 | return r ? r->start : -ENXIO; |
| 184 | } |
| 185 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
| 186 | |
| 187 | /** |
| 188 | * platform_add_devices - add a numbers of platform devices |
| 189 | * @devs: array of platform devices to add |
| 190 | * @num: number of platform devices in array |
| 191 | */ |
| 192 | int platform_add_devices(struct platform_device **devs, int num) |
| 193 | { |
| 194 | int i, ret = 0; |
| 195 | |
| 196 | for (i = 0; i < num; i++) { |
| 197 | ret = platform_device_register(devs[i]); |
| 198 | if (ret) { |
| 199 | while (--i >= 0) |
| 200 | platform_device_unregister(devs[i]); |
| 201 | break; |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | return ret; |
| 206 | } |
| 207 | EXPORT_SYMBOL_GPL(platform_add_devices); |
| 208 | |
| 209 | struct platform_object { |
| 210 | struct platform_device pdev; |
| 211 | char name[]; |
| 212 | }; |
| 213 | |
| 214 | /** |
| 215 | * platform_device_put - destroy a platform device |
| 216 | * @pdev: platform device to free |
| 217 | * |
| 218 | * Free all memory associated with a platform device. This function must |
| 219 | * _only_ be externally called in error cases. All other usage is a bug. |
| 220 | */ |
| 221 | void platform_device_put(struct platform_device *pdev) |
| 222 | { |
| 223 | if (pdev) |
| 224 | put_device(&pdev->dev); |
| 225 | } |
| 226 | EXPORT_SYMBOL_GPL(platform_device_put); |
| 227 | |
| 228 | static void platform_device_release(struct device *dev) |
| 229 | { |
| 230 | struct platform_object *pa = container_of(dev, struct platform_object, |
| 231 | pdev.dev); |
| 232 | |
| 233 | of_device_node_put(&pa->pdev.dev); |
| 234 | kfree(pa->pdev.dev.platform_data); |
| 235 | kfree(pa->pdev.mfd_cell); |
| 236 | kfree(pa->pdev.resource); |
| 237 | kfree(pa->pdev.driver_override); |
| 238 | kfree(pa); |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * platform_device_alloc - create a platform device |
| 243 | * @name: base name of the device we're adding |
| 244 | * @id: instance id |
| 245 | * |
| 246 | * Create a platform device object which can have other objects attached |
| 247 | * to it, and which will have attached objects freed when it is released. |
| 248 | */ |
| 249 | struct platform_device *platform_device_alloc(const char *name, int id) |
| 250 | { |
| 251 | struct platform_object *pa; |
| 252 | |
| 253 | pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL); |
| 254 | if (pa) { |
| 255 | strcpy(pa->name, name); |
| 256 | pa->pdev.name = pa->name; |
| 257 | pa->pdev.id = id; |
| 258 | device_initialize(&pa->pdev.dev); |
| 259 | pa->pdev.dev.release = platform_device_release; |
| 260 | arch_setup_pdev_archdata(&pa->pdev); |
| 261 | } |
| 262 | |
| 263 | return pa ? &pa->pdev : NULL; |
| 264 | } |
| 265 | EXPORT_SYMBOL_GPL(platform_device_alloc); |
| 266 | |
| 267 | /** |
| 268 | * platform_device_add_resources - add resources to a platform device |
| 269 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
| 270 | * @res: set of resources that needs to be allocated for the device |
| 271 | * @num: number of resources |
| 272 | * |
| 273 | * Add a copy of the resources to the platform device. The memory |
| 274 | * associated with the resources will be freed when the platform device is |
| 275 | * released. |
| 276 | */ |
| 277 | int platform_device_add_resources(struct platform_device *pdev, |
| 278 | const struct resource *res, unsigned int num) |
| 279 | { |
| 280 | struct resource *r = NULL; |
| 281 | |
| 282 | if (res) { |
| 283 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); |
| 284 | if (!r) |
| 285 | return -ENOMEM; |
| 286 | } |
| 287 | |
| 288 | kfree(pdev->resource); |
| 289 | pdev->resource = r; |
| 290 | pdev->num_resources = num; |
| 291 | return 0; |
| 292 | } |
| 293 | EXPORT_SYMBOL_GPL(platform_device_add_resources); |
| 294 | |
| 295 | /** |
| 296 | * platform_device_add_data - add platform-specific data to a platform device |
| 297 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
| 298 | * @data: platform specific data for this platform device |
| 299 | * @size: size of platform specific data |
| 300 | * |
| 301 | * Add a copy of platform specific data to the platform device's |
| 302 | * platform_data pointer. The memory associated with the platform data |
| 303 | * will be freed when the platform device is released. |
| 304 | */ |
| 305 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
| 306 | size_t size) |
| 307 | { |
| 308 | void *d = NULL; |
| 309 | |
| 310 | if (data) { |
| 311 | d = kmemdup(data, size, GFP_KERNEL); |
| 312 | if (!d) |
| 313 | return -ENOMEM; |
| 314 | } |
| 315 | |
| 316 | kfree(pdev->dev.platform_data); |
| 317 | pdev->dev.platform_data = d; |
| 318 | return 0; |
| 319 | } |
| 320 | EXPORT_SYMBOL_GPL(platform_device_add_data); |
| 321 | |
| 322 | /** |
| 323 | * platform_device_add_properties - add built-in properties to a platform device |
| 324 | * @pdev: platform device to add properties to |
| 325 | * @pset: properties to add |
| 326 | * |
| 327 | * The function will take deep copy of the properties in @pset and attach |
| 328 | * the copy to the platform device. The memory associated with properties |
| 329 | * will be freed when the platform device is released. |
| 330 | */ |
| 331 | int platform_device_add_properties(struct platform_device *pdev, |
| 332 | const struct property_set *pset) |
| 333 | { |
| 334 | return device_add_property_set(&pdev->dev, pset); |
| 335 | } |
| 336 | EXPORT_SYMBOL_GPL(platform_device_add_properties); |
| 337 | |
| 338 | /** |
| 339 | * platform_device_add - add a platform device to device hierarchy |
| 340 | * @pdev: platform device we're adding |
| 341 | * |
| 342 | * This is part 2 of platform_device_register(), though may be called |
| 343 | * separately _iff_ pdev was allocated by platform_device_alloc(). |
| 344 | */ |
| 345 | int platform_device_add(struct platform_device *pdev) |
| 346 | { |
| 347 | int i, ret; |
| 348 | |
| 349 | if (!pdev) |
| 350 | return -EINVAL; |
| 351 | |
| 352 | if (!pdev->dev.parent) |
| 353 | pdev->dev.parent = &platform_bus; |
| 354 | |
| 355 | pdev->dev.bus = &platform_bus_type; |
| 356 | |
| 357 | switch (pdev->id) { |
| 358 | default: |
| 359 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
| 360 | break; |
| 361 | case PLATFORM_DEVID_NONE: |
| 362 | dev_set_name(&pdev->dev, "%s", pdev->name); |
| 363 | break; |
| 364 | case PLATFORM_DEVID_AUTO: |
| 365 | /* |
| 366 | * Automatically allocated device ID. We mark it as such so |
| 367 | * that we remember it must be freed, and we append a suffix |
| 368 | * to avoid namespace collision with explicit IDs. |
| 369 | */ |
| 370 | ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL); |
| 371 | if (ret < 0) |
| 372 | goto err_out; |
| 373 | pdev->id = ret; |
| 374 | pdev->id_auto = true; |
| 375 | dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); |
| 376 | break; |
| 377 | } |
| 378 | |
| 379 | for (i = 0; i < pdev->num_resources; i++) { |
| 380 | struct resource *p, *r = &pdev->resource[i]; |
| 381 | |
| 382 | if (r->name == NULL) |
| 383 | r->name = dev_name(&pdev->dev); |
| 384 | |
| 385 | p = r->parent; |
| 386 | if (!p) { |
| 387 | if (resource_type(r) == IORESOURCE_MEM) |
| 388 | p = &iomem_resource; |
| 389 | else if (resource_type(r) == IORESOURCE_IO) |
| 390 | p = &ioport_resource; |
| 391 | } |
| 392 | |
| 393 | if (p && insert_resource(p, r)) { |
| 394 | dev_err(&pdev->dev, "failed to claim resource %d\n", i); |
| 395 | ret = -EBUSY; |
| 396 | goto failed; |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | pr_debug("Registering platform device '%s'. Parent at %s\n", |
| 401 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
| 402 | |
| 403 | ret = device_add(&pdev->dev); |
| 404 | if (ret == 0) |
| 405 | return ret; |
| 406 | |
| 407 | failed: |
| 408 | if (pdev->id_auto) { |
| 409 | ida_simple_remove(&platform_devid_ida, pdev->id); |
| 410 | pdev->id = PLATFORM_DEVID_AUTO; |
| 411 | } |
| 412 | |
| 413 | while (--i >= 0) { |
| 414 | struct resource *r = &pdev->resource[i]; |
| 415 | if (r->parent) |
| 416 | release_resource(r); |
| 417 | } |
| 418 | |
| 419 | err_out: |
| 420 | return ret; |
| 421 | } |
| 422 | EXPORT_SYMBOL_GPL(platform_device_add); |
| 423 | |
| 424 | /** |
| 425 | * platform_device_del - remove a platform-level device |
| 426 | * @pdev: platform device we're removing |
| 427 | * |
| 428 | * Note that this function will also release all memory- and port-based |
| 429 | * resources owned by the device (@dev->resource). This function must |
| 430 | * _only_ be externally called in error cases. All other usage is a bug. |
| 431 | */ |
| 432 | void platform_device_del(struct platform_device *pdev) |
| 433 | { |
| 434 | int i; |
| 435 | |
| 436 | if (pdev) { |
| 437 | device_del(&pdev->dev); |
| 438 | |
| 439 | if (pdev->id_auto) { |
| 440 | ida_simple_remove(&platform_devid_ida, pdev->id); |
| 441 | pdev->id = PLATFORM_DEVID_AUTO; |
| 442 | } |
| 443 | |
| 444 | for (i = 0; i < pdev->num_resources; i++) { |
| 445 | struct resource *r = &pdev->resource[i]; |
| 446 | if (r->parent) |
| 447 | release_resource(r); |
| 448 | } |
| 449 | |
| 450 | device_remove_property_set(&pdev->dev); |
| 451 | } |
| 452 | } |
| 453 | EXPORT_SYMBOL_GPL(platform_device_del); |
| 454 | |
| 455 | /** |
| 456 | * platform_device_register - add a platform-level device |
| 457 | * @pdev: platform device we're adding |
| 458 | */ |
| 459 | int platform_device_register(struct platform_device *pdev) |
| 460 | { |
| 461 | device_initialize(&pdev->dev); |
| 462 | arch_setup_pdev_archdata(pdev); |
| 463 | return platform_device_add(pdev); |
| 464 | } |
| 465 | EXPORT_SYMBOL_GPL(platform_device_register); |
| 466 | |
| 467 | /** |
| 468 | * platform_device_unregister - unregister a platform-level device |
| 469 | * @pdev: platform device we're unregistering |
| 470 | * |
| 471 | * Unregistration is done in 2 steps. First we release all resources |
| 472 | * and remove it from the subsystem, then we drop reference count by |
| 473 | * calling platform_device_put(). |
| 474 | */ |
| 475 | void platform_device_unregister(struct platform_device *pdev) |
| 476 | { |
| 477 | platform_device_del(pdev); |
| 478 | platform_device_put(pdev); |
| 479 | } |
| 480 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
| 481 | |
| 482 | /** |
| 483 | * platform_device_register_full - add a platform-level device with |
| 484 | * resources and platform-specific data |
| 485 | * |
| 486 | * @pdevinfo: data used to create device |
| 487 | * |
| 488 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
| 489 | */ |
| 490 | struct platform_device *platform_device_register_full( |
| 491 | const struct platform_device_info *pdevinfo) |
| 492 | { |
| 493 | int ret = -ENOMEM; |
| 494 | struct platform_device *pdev; |
| 495 | |
| 496 | pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
| 497 | if (!pdev) |
| 498 | goto err_alloc; |
| 499 | |
| 500 | pdev->dev.parent = pdevinfo->parent; |
| 501 | pdev->dev.fwnode = pdevinfo->fwnode; |
| 502 | |
| 503 | if (pdevinfo->dma_mask) { |
| 504 | /* |
| 505 | * This memory isn't freed when the device is put, |
| 506 | * I don't have a nice idea for that though. Conceptually |
| 507 | * dma_mask in struct device should not be a pointer. |
| 508 | * See http://thread.gmane.org/gmane.linux.kernel.pci/9081 |
| 509 | */ |
| 510 | pdev->dev.dma_mask = |
| 511 | kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); |
| 512 | if (!pdev->dev.dma_mask) |
| 513 | goto err; |
| 514 | |
| 515 | *pdev->dev.dma_mask = pdevinfo->dma_mask; |
| 516 | pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; |
| 517 | } |
| 518 | |
| 519 | ret = platform_device_add_resources(pdev, |
| 520 | pdevinfo->res, pdevinfo->num_res); |
| 521 | if (ret) |
| 522 | goto err; |
| 523 | |
| 524 | ret = platform_device_add_data(pdev, |
| 525 | pdevinfo->data, pdevinfo->size_data); |
| 526 | if (ret) |
| 527 | goto err; |
| 528 | |
| 529 | if (pdevinfo->pset) { |
| 530 | ret = platform_device_add_properties(pdev, pdevinfo->pset); |
| 531 | if (ret) |
| 532 | goto err; |
| 533 | } |
| 534 | |
| 535 | ret = platform_device_add(pdev); |
| 536 | if (ret) { |
| 537 | err: |
| 538 | ACPI_COMPANION_SET(&pdev->dev, NULL); |
| 539 | kfree(pdev->dev.dma_mask); |
| 540 | |
| 541 | err_alloc: |
| 542 | platform_device_put(pdev); |
| 543 | return ERR_PTR(ret); |
| 544 | } |
| 545 | |
| 546 | return pdev; |
| 547 | } |
| 548 | EXPORT_SYMBOL_GPL(platform_device_register_full); |
| 549 | |
| 550 | static int platform_drv_probe(struct device *_dev) |
| 551 | { |
| 552 | struct platform_driver *drv = to_platform_driver(_dev->driver); |
| 553 | struct platform_device *dev = to_platform_device(_dev); |
| 554 | int ret; |
| 555 | |
| 556 | ret = of_clk_set_defaults(_dev->of_node, false); |
| 557 | if (ret < 0) |
| 558 | return ret; |
| 559 | |
| 560 | ret = dev_pm_domain_attach(_dev, true); |
| 561 | if (ret != -EPROBE_DEFER) { |
| 562 | if (drv->probe) { |
| 563 | ret = drv->probe(dev); |
| 564 | if (ret) |
| 565 | dev_pm_domain_detach(_dev, true); |
| 566 | } else { |
| 567 | /* don't fail if just dev_pm_domain_attach failed */ |
| 568 | ret = 0; |
| 569 | } |
| 570 | } |
| 571 | |
| 572 | if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) { |
| 573 | dev_warn(_dev, "probe deferral not supported\n"); |
| 574 | ret = -ENXIO; |
| 575 | } |
| 576 | |
| 577 | return ret; |
| 578 | } |
| 579 | |
| 580 | static int platform_drv_probe_fail(struct device *_dev) |
| 581 | { |
| 582 | return -ENXIO; |
| 583 | } |
| 584 | |
| 585 | static int platform_drv_remove(struct device *_dev) |
| 586 | { |
| 587 | struct platform_driver *drv = to_platform_driver(_dev->driver); |
| 588 | struct platform_device *dev = to_platform_device(_dev); |
| 589 | int ret = 0; |
| 590 | |
| 591 | if (drv->remove) |
| 592 | ret = drv->remove(dev); |
| 593 | dev_pm_domain_detach(_dev, true); |
| 594 | |
| 595 | return ret; |
| 596 | } |
| 597 | |
| 598 | static void platform_drv_shutdown(struct device *_dev) |
| 599 | { |
| 600 | struct platform_driver *drv = to_platform_driver(_dev->driver); |
| 601 | struct platform_device *dev = to_platform_device(_dev); |
| 602 | |
| 603 | if (drv->shutdown) |
| 604 | drv->shutdown(dev); |
| 605 | } |
| 606 | |
| 607 | /** |
| 608 | * __platform_driver_register - register a driver for platform-level devices |
| 609 | * @drv: platform driver structure |
| 610 | * @owner: owning module/driver |
| 611 | */ |
| 612 | int __platform_driver_register(struct platform_driver *drv, |
| 613 | struct module *owner) |
| 614 | { |
| 615 | drv->driver.owner = owner; |
| 616 | drv->driver.bus = &platform_bus_type; |
| 617 | drv->driver.probe = platform_drv_probe; |
| 618 | drv->driver.remove = platform_drv_remove; |
| 619 | drv->driver.shutdown = platform_drv_shutdown; |
| 620 | |
| 621 | return driver_register(&drv->driver); |
| 622 | } |
| 623 | EXPORT_SYMBOL_GPL(__platform_driver_register); |
| 624 | |
| 625 | /** |
| 626 | * platform_driver_unregister - unregister a driver for platform-level devices |
| 627 | * @drv: platform driver structure |
| 628 | */ |
| 629 | void platform_driver_unregister(struct platform_driver *drv) |
| 630 | { |
| 631 | driver_unregister(&drv->driver); |
| 632 | } |
| 633 | EXPORT_SYMBOL_GPL(platform_driver_unregister); |
| 634 | |
| 635 | /** |
| 636 | * __platform_driver_probe - register driver for non-hotpluggable device |
| 637 | * @drv: platform driver structure |
| 638 | * @probe: the driver probe routine, probably from an __init section |
| 639 | * @module: module which will be the owner of the driver |
| 640 | * |
| 641 | * Use this instead of platform_driver_register() when you know the device |
| 642 | * is not hotpluggable and has already been registered, and you want to |
| 643 | * remove its run-once probe() infrastructure from memory after the driver |
| 644 | * has bound to the device. |
| 645 | * |
| 646 | * One typical use for this would be with drivers for controllers integrated |
| 647 | * into system-on-chip processors, where the controller devices have been |
| 648 | * configured as part of board setup. |
| 649 | * |
| 650 | * Note that this is incompatible with deferred probing. |
| 651 | * |
| 652 | * Returns zero if the driver registered and bound to a device, else returns |
| 653 | * a negative error code and with the driver not registered. |
| 654 | */ |
| 655 | int __init_or_module __platform_driver_probe(struct platform_driver *drv, |
| 656 | int (*probe)(struct platform_device *), struct module *module) |
| 657 | { |
| 658 | int retval, code; |
| 659 | |
| 660 | if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) { |
| 661 | pr_err("%s: drivers registered with %s can not be probed asynchronously\n", |
| 662 | drv->driver.name, __func__); |
| 663 | return -EINVAL; |
| 664 | } |
| 665 | |
| 666 | /* |
| 667 | * We have to run our probes synchronously because we check if |
| 668 | * we find any devices to bind to and exit with error if there |
| 669 | * are any. |
| 670 | */ |
| 671 | drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS; |
| 672 | |
| 673 | /* |
| 674 | * Prevent driver from requesting probe deferral to avoid further |
| 675 | * futile probe attempts. |
| 676 | */ |
| 677 | drv->prevent_deferred_probe = true; |
| 678 | |
| 679 | /* make sure driver won't have bind/unbind attributes */ |
| 680 | drv->driver.suppress_bind_attrs = true; |
| 681 | |
| 682 | /* temporary section violation during probe() */ |
| 683 | drv->probe = probe; |
| 684 | retval = code = __platform_driver_register(drv, module); |
| 685 | |
| 686 | /* |
| 687 | * Fixup that section violation, being paranoid about code scanning |
| 688 | * the list of drivers in order to probe new devices. Check to see |
| 689 | * if the probe was successful, and make sure any forced probes of |
| 690 | * new devices fail. |
| 691 | */ |
| 692 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
| 693 | drv->probe = NULL; |
| 694 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
| 695 | retval = -ENODEV; |
| 696 | drv->driver.probe = platform_drv_probe_fail; |
| 697 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
| 698 | |
| 699 | if (code != retval) |
| 700 | platform_driver_unregister(drv); |
| 701 | return retval; |
| 702 | } |
| 703 | EXPORT_SYMBOL_GPL(__platform_driver_probe); |
| 704 | |
| 705 | /** |
| 706 | * __platform_create_bundle - register driver and create corresponding device |
| 707 | * @driver: platform driver structure |
| 708 | * @probe: the driver probe routine, probably from an __init section |
| 709 | * @res: set of resources that needs to be allocated for the device |
| 710 | * @n_res: number of resources |
| 711 | * @data: platform specific data for this platform device |
| 712 | * @size: size of platform specific data |
| 713 | * @module: module which will be the owner of the driver |
| 714 | * |
| 715 | * Use this in legacy-style modules that probe hardware directly and |
| 716 | * register a single platform device and corresponding platform driver. |
| 717 | * |
| 718 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
| 719 | */ |
| 720 | struct platform_device * __init_or_module __platform_create_bundle( |
| 721 | struct platform_driver *driver, |
| 722 | int (*probe)(struct platform_device *), |
| 723 | struct resource *res, unsigned int n_res, |
| 724 | const void *data, size_t size, struct module *module) |
| 725 | { |
| 726 | struct platform_device *pdev; |
| 727 | int error; |
| 728 | |
| 729 | pdev = platform_device_alloc(driver->driver.name, -1); |
| 730 | if (!pdev) { |
| 731 | error = -ENOMEM; |
| 732 | goto err_out; |
| 733 | } |
| 734 | |
| 735 | error = platform_device_add_resources(pdev, res, n_res); |
| 736 | if (error) |
| 737 | goto err_pdev_put; |
| 738 | |
| 739 | error = platform_device_add_data(pdev, data, size); |
| 740 | if (error) |
| 741 | goto err_pdev_put; |
| 742 | |
| 743 | error = platform_device_add(pdev); |
| 744 | if (error) |
| 745 | goto err_pdev_put; |
| 746 | |
| 747 | error = __platform_driver_probe(driver, probe, module); |
| 748 | if (error) |
| 749 | goto err_pdev_del; |
| 750 | |
| 751 | return pdev; |
| 752 | |
| 753 | err_pdev_del: |
| 754 | platform_device_del(pdev); |
| 755 | err_pdev_put: |
| 756 | platform_device_put(pdev); |
| 757 | err_out: |
| 758 | return ERR_PTR(error); |
| 759 | } |
| 760 | EXPORT_SYMBOL_GPL(__platform_create_bundle); |
| 761 | |
| 762 | /** |
| 763 | * __platform_register_drivers - register an array of platform drivers |
| 764 | * @drivers: an array of drivers to register |
| 765 | * @count: the number of drivers to register |
| 766 | * @owner: module owning the drivers |
| 767 | * |
| 768 | * Registers platform drivers specified by an array. On failure to register a |
| 769 | * driver, all previously registered drivers will be unregistered. Callers of |
| 770 | * this API should use platform_unregister_drivers() to unregister drivers in |
| 771 | * the reverse order. |
| 772 | * |
| 773 | * Returns: 0 on success or a negative error code on failure. |
| 774 | */ |
| 775 | int __platform_register_drivers(struct platform_driver * const *drivers, |
| 776 | unsigned int count, struct module *owner) |
| 777 | { |
| 778 | unsigned int i; |
| 779 | int err; |
| 780 | |
| 781 | for (i = 0; i < count; i++) { |
| 782 | pr_debug("registering platform driver %ps\n", drivers[i]); |
| 783 | |
| 784 | err = __platform_driver_register(drivers[i], owner); |
| 785 | if (err < 0) { |
| 786 | pr_err("failed to register platform driver %ps: %d\n", |
| 787 | drivers[i], err); |
| 788 | goto error; |
| 789 | } |
| 790 | } |
| 791 | |
| 792 | return 0; |
| 793 | |
| 794 | error: |
| 795 | while (i--) { |
| 796 | pr_debug("unregistering platform driver %ps\n", drivers[i]); |
| 797 | platform_driver_unregister(drivers[i]); |
| 798 | } |
| 799 | |
| 800 | return err; |
| 801 | } |
| 802 | EXPORT_SYMBOL_GPL(__platform_register_drivers); |
| 803 | |
| 804 | /** |
| 805 | * platform_unregister_drivers - unregister an array of platform drivers |
| 806 | * @drivers: an array of drivers to unregister |
| 807 | * @count: the number of drivers to unregister |
| 808 | * |
| 809 | * Unegisters platform drivers specified by an array. This is typically used |
| 810 | * to complement an earlier call to platform_register_drivers(). Drivers are |
| 811 | * unregistered in the reverse order in which they were registered. |
| 812 | */ |
| 813 | void platform_unregister_drivers(struct platform_driver * const *drivers, |
| 814 | unsigned int count) |
| 815 | { |
| 816 | while (count--) { |
| 817 | pr_debug("unregistering platform driver %ps\n", drivers[count]); |
| 818 | platform_driver_unregister(drivers[count]); |
| 819 | } |
| 820 | } |
| 821 | EXPORT_SYMBOL_GPL(platform_unregister_drivers); |
| 822 | |
| 823 | /* modalias support enables more hands-off userspace setup: |
| 824 | * (a) environment variable lets new-style hotplug events work once system is |
| 825 | * fully running: "modprobe $MODALIAS" |
| 826 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events |
| 827 | * mishandled before system is fully running: "modprobe $(cat modalias)" |
| 828 | */ |
| 829 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
| 830 | char *buf) |
| 831 | { |
| 832 | struct platform_device *pdev = to_platform_device(dev); |
| 833 | int len; |
| 834 | |
| 835 | len = of_device_get_modalias(dev, buf, PAGE_SIZE -1); |
| 836 | if (len != -ENODEV) |
| 837 | return len; |
| 838 | |
| 839 | len = acpi_device_modalias(dev, buf, PAGE_SIZE -1); |
| 840 | if (len != -ENODEV) |
| 841 | return len; |
| 842 | |
| 843 | len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
| 844 | |
| 845 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; |
| 846 | } |
| 847 | static DEVICE_ATTR_RO(modalias); |
| 848 | |
| 849 | static ssize_t driver_override_store(struct device *dev, |
| 850 | struct device_attribute *attr, |
| 851 | const char *buf, size_t count) |
| 852 | { |
| 853 | struct platform_device *pdev = to_platform_device(dev); |
| 854 | char *driver_override, *old = pdev->driver_override, *cp; |
| 855 | |
| 856 | if (count > PATH_MAX) |
| 857 | return -EINVAL; |
| 858 | |
| 859 | driver_override = kstrndup(buf, count, GFP_KERNEL); |
| 860 | if (!driver_override) |
| 861 | return -ENOMEM; |
| 862 | |
| 863 | cp = strchr(driver_override, '\n'); |
| 864 | if (cp) |
| 865 | *cp = '\0'; |
| 866 | |
| 867 | if (strlen(driver_override)) { |
| 868 | pdev->driver_override = driver_override; |
| 869 | } else { |
| 870 | kfree(driver_override); |
| 871 | pdev->driver_override = NULL; |
| 872 | } |
| 873 | |
| 874 | kfree(old); |
| 875 | |
| 876 | return count; |
| 877 | } |
| 878 | |
| 879 | static ssize_t driver_override_show(struct device *dev, |
| 880 | struct device_attribute *attr, char *buf) |
| 881 | { |
| 882 | struct platform_device *pdev = to_platform_device(dev); |
| 883 | |
| 884 | return sprintf(buf, "%s\n", pdev->driver_override); |
| 885 | } |
| 886 | static DEVICE_ATTR_RW(driver_override); |
| 887 | |
| 888 | |
| 889 | static struct attribute *platform_dev_attrs[] = { |
| 890 | &dev_attr_modalias.attr, |
| 891 | &dev_attr_driver_override.attr, |
| 892 | NULL, |
| 893 | }; |
| 894 | ATTRIBUTE_GROUPS(platform_dev); |
| 895 | |
| 896 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
| 897 | { |
| 898 | struct platform_device *pdev = to_platform_device(dev); |
| 899 | int rc; |
| 900 | |
| 901 | /* Some devices have extra OF data and an OF-style MODALIAS */ |
| 902 | rc = of_device_uevent_modalias(dev, env); |
| 903 | if (rc != -ENODEV) |
| 904 | return rc; |
| 905 | |
| 906 | rc = acpi_device_uevent_modalias(dev, env); |
| 907 | if (rc != -ENODEV) |
| 908 | return rc; |
| 909 | |
| 910 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
| 911 | pdev->name); |
| 912 | return 0; |
| 913 | } |
| 914 | |
| 915 | static const struct platform_device_id *platform_match_id( |
| 916 | const struct platform_device_id *id, |
| 917 | struct platform_device *pdev) |
| 918 | { |
| 919 | while (id->name[0]) { |
| 920 | if (strcmp(pdev->name, id->name) == 0) { |
| 921 | pdev->id_entry = id; |
| 922 | return id; |
| 923 | } |
| 924 | id++; |
| 925 | } |
| 926 | return NULL; |
| 927 | } |
| 928 | |
| 929 | /** |
| 930 | * platform_match - bind platform device to platform driver. |
| 931 | * @dev: device. |
| 932 | * @drv: driver. |
| 933 | * |
| 934 | * Platform device IDs are assumed to be encoded like this: |
| 935 | * "<name><instance>", where <name> is a short description of the type of |
| 936 | * device, like "pci" or "floppy", and <instance> is the enumerated |
| 937 | * instance of the device, like '0' or '42'. Driver IDs are simply |
| 938 | * "<name>". So, extract the <name> from the platform_device structure, |
| 939 | * and compare it against the name of the driver. Return whether they match |
| 940 | * or not. |
| 941 | */ |
| 942 | static int platform_match(struct device *dev, struct device_driver *drv) |
| 943 | { |
| 944 | struct platform_device *pdev = to_platform_device(dev); |
| 945 | struct platform_driver *pdrv = to_platform_driver(drv); |
| 946 | |
| 947 | /* When driver_override is set, only bind to the matching driver */ |
| 948 | if (pdev->driver_override) |
| 949 | return !strcmp(pdev->driver_override, drv->name); |
| 950 | |
| 951 | /* Attempt an OF style match first */ |
| 952 | if (of_driver_match_device(dev, drv)) |
| 953 | return 1; |
| 954 | |
| 955 | /* Then try ACPI style match */ |
| 956 | if (acpi_driver_match_device(dev, drv)) |
| 957 | return 1; |
| 958 | |
| 959 | /* Then try to match against the id table */ |
| 960 | if (pdrv->id_table) |
| 961 | return platform_match_id(pdrv->id_table, pdev) != NULL; |
| 962 | |
| 963 | /* fall-back to driver name match */ |
| 964 | return (strcmp(pdev->name, drv->name) == 0); |
| 965 | } |
| 966 | |
| 967 | #ifdef CONFIG_PM_SLEEP |
| 968 | |
| 969 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) |
| 970 | { |
| 971 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
| 972 | struct platform_device *pdev = to_platform_device(dev); |
| 973 | int ret = 0; |
| 974 | |
| 975 | if (dev->driver && pdrv->suspend) |
| 976 | ret = pdrv->suspend(pdev, mesg); |
| 977 | |
| 978 | return ret; |
| 979 | } |
| 980 | |
| 981 | static int platform_legacy_resume(struct device *dev) |
| 982 | { |
| 983 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
| 984 | struct platform_device *pdev = to_platform_device(dev); |
| 985 | int ret = 0; |
| 986 | |
| 987 | if (dev->driver && pdrv->resume) |
| 988 | ret = pdrv->resume(pdev); |
| 989 | |
| 990 | return ret; |
| 991 | } |
| 992 | |
| 993 | #endif /* CONFIG_PM_SLEEP */ |
| 994 | |
| 995 | #ifdef CONFIG_SUSPEND |
| 996 | |
| 997 | int platform_pm_suspend(struct device *dev) |
| 998 | { |
| 999 | struct device_driver *drv = dev->driver; |
| 1000 | int ret = 0; |
| 1001 | |
| 1002 | if (!drv) |
| 1003 | return 0; |
| 1004 | |
| 1005 | if (drv->pm) { |
| 1006 | if (drv->pm->suspend) |
| 1007 | ret = drv->pm->suspend(dev); |
| 1008 | } else { |
| 1009 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); |
| 1010 | } |
| 1011 | |
| 1012 | return ret; |
| 1013 | } |
| 1014 | |
| 1015 | int platform_pm_resume(struct device *dev) |
| 1016 | { |
| 1017 | struct device_driver *drv = dev->driver; |
| 1018 | int ret = 0; |
| 1019 | |
| 1020 | if (!drv) |
| 1021 | return 0; |
| 1022 | |
| 1023 | if (drv->pm) { |
| 1024 | if (drv->pm->resume) |
| 1025 | ret = drv->pm->resume(dev); |
| 1026 | } else { |
| 1027 | ret = platform_legacy_resume(dev); |
| 1028 | } |
| 1029 | |
| 1030 | return ret; |
| 1031 | } |
| 1032 | |
| 1033 | #endif /* CONFIG_SUSPEND */ |
| 1034 | |
| 1035 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
| 1036 | |
| 1037 | int platform_pm_freeze(struct device *dev) |
| 1038 | { |
| 1039 | struct device_driver *drv = dev->driver; |
| 1040 | int ret = 0; |
| 1041 | |
| 1042 | if (!drv) |
| 1043 | return 0; |
| 1044 | |
| 1045 | if (drv->pm) { |
| 1046 | if (drv->pm->freeze) |
| 1047 | ret = drv->pm->freeze(dev); |
| 1048 | } else { |
| 1049 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); |
| 1050 | } |
| 1051 | |
| 1052 | return ret; |
| 1053 | } |
| 1054 | |
| 1055 | int platform_pm_thaw(struct device *dev) |
| 1056 | { |
| 1057 | struct device_driver *drv = dev->driver; |
| 1058 | int ret = 0; |
| 1059 | |
| 1060 | if (!drv) |
| 1061 | return 0; |
| 1062 | |
| 1063 | if (drv->pm) { |
| 1064 | if (drv->pm->thaw) |
| 1065 | ret = drv->pm->thaw(dev); |
| 1066 | } else { |
| 1067 | ret = platform_legacy_resume(dev); |
| 1068 | } |
| 1069 | |
| 1070 | return ret; |
| 1071 | } |
| 1072 | |
| 1073 | int platform_pm_poweroff(struct device *dev) |
| 1074 | { |
| 1075 | struct device_driver *drv = dev->driver; |
| 1076 | int ret = 0; |
| 1077 | |
| 1078 | if (!drv) |
| 1079 | return 0; |
| 1080 | |
| 1081 | if (drv->pm) { |
| 1082 | if (drv->pm->poweroff) |
| 1083 | ret = drv->pm->poweroff(dev); |
| 1084 | } else { |
| 1085 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); |
| 1086 | } |
| 1087 | |
| 1088 | return ret; |
| 1089 | } |
| 1090 | |
| 1091 | int platform_pm_restore(struct device *dev) |
| 1092 | { |
| 1093 | struct device_driver *drv = dev->driver; |
| 1094 | int ret = 0; |
| 1095 | |
| 1096 | if (!drv) |
| 1097 | return 0; |
| 1098 | |
| 1099 | if (drv->pm) { |
| 1100 | if (drv->pm->restore) |
| 1101 | ret = drv->pm->restore(dev); |
| 1102 | } else { |
| 1103 | ret = platform_legacy_resume(dev); |
| 1104 | } |
| 1105 | |
| 1106 | return ret; |
| 1107 | } |
| 1108 | |
| 1109 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
| 1110 | |
| 1111 | static const struct dev_pm_ops platform_dev_pm_ops = { |
| 1112 | .runtime_suspend = pm_generic_runtime_suspend, |
| 1113 | .runtime_resume = pm_generic_runtime_resume, |
| 1114 | USE_PLATFORM_PM_SLEEP_OPS |
| 1115 | }; |
| 1116 | |
| 1117 | struct bus_type platform_bus_type = { |
| 1118 | .name = "platform", |
| 1119 | .dev_groups = platform_dev_groups, |
| 1120 | .match = platform_match, |
| 1121 | .uevent = platform_uevent, |
| 1122 | .pm = &platform_dev_pm_ops, |
| 1123 | }; |
| 1124 | EXPORT_SYMBOL_GPL(platform_bus_type); |
| 1125 | |
| 1126 | int __init platform_bus_init(void) |
| 1127 | { |
| 1128 | int error; |
| 1129 | |
| 1130 | early_platform_cleanup(); |
| 1131 | |
| 1132 | error = device_register(&platform_bus); |
| 1133 | if (error) |
| 1134 | return error; |
| 1135 | error = bus_register(&platform_bus_type); |
| 1136 | if (error) |
| 1137 | device_unregister(&platform_bus); |
| 1138 | of_platform_register_reconfig_notifier(); |
| 1139 | return error; |
| 1140 | } |
| 1141 | |
| 1142 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK |
| 1143 | u64 dma_get_required_mask(struct device *dev) |
| 1144 | { |
| 1145 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); |
| 1146 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); |
| 1147 | u64 mask; |
| 1148 | |
| 1149 | if (!high_totalram) { |
| 1150 | /* convert to mask just covering totalram */ |
| 1151 | low_totalram = (1 << (fls(low_totalram) - 1)); |
| 1152 | low_totalram += low_totalram - 1; |
| 1153 | mask = low_totalram; |
| 1154 | } else { |
| 1155 | high_totalram = (1 << (fls(high_totalram) - 1)); |
| 1156 | high_totalram += high_totalram - 1; |
| 1157 | mask = (((u64)high_totalram) << 32) + 0xffffffff; |
| 1158 | } |
| 1159 | return mask; |
| 1160 | } |
| 1161 | EXPORT_SYMBOL_GPL(dma_get_required_mask); |
| 1162 | #endif |
| 1163 | |
| 1164 | static __initdata LIST_HEAD(early_platform_driver_list); |
| 1165 | static __initdata LIST_HEAD(early_platform_device_list); |
| 1166 | |
| 1167 | /** |
| 1168 | * early_platform_driver_register - register early platform driver |
| 1169 | * @epdrv: early_platform driver structure |
| 1170 | * @buf: string passed from early_param() |
| 1171 | * |
| 1172 | * Helper function for early_platform_init() / early_platform_init_buffer() |
| 1173 | */ |
| 1174 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, |
| 1175 | char *buf) |
| 1176 | { |
| 1177 | char *tmp; |
| 1178 | int n; |
| 1179 | |
| 1180 | /* Simply add the driver to the end of the global list. |
| 1181 | * Drivers will by default be put on the list in compiled-in order. |
| 1182 | */ |
| 1183 | if (!epdrv->list.next) { |
| 1184 | INIT_LIST_HEAD(&epdrv->list); |
| 1185 | list_add_tail(&epdrv->list, &early_platform_driver_list); |
| 1186 | } |
| 1187 | |
| 1188 | /* If the user has specified device then make sure the driver |
| 1189 | * gets prioritized. The driver of the last device specified on |
| 1190 | * command line will be put first on the list. |
| 1191 | */ |
| 1192 | n = strlen(epdrv->pdrv->driver.name); |
| 1193 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { |
| 1194 | list_move(&epdrv->list, &early_platform_driver_list); |
| 1195 | |
| 1196 | /* Allow passing parameters after device name */ |
| 1197 | if (buf[n] == '\0' || buf[n] == ',') |
| 1198 | epdrv->requested_id = -1; |
| 1199 | else { |
| 1200 | epdrv->requested_id = simple_strtoul(&buf[n + 1], |
| 1201 | &tmp, 10); |
| 1202 | |
| 1203 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { |
| 1204 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; |
| 1205 | n = 0; |
| 1206 | } else |
| 1207 | n += strcspn(&buf[n + 1], ",") + 1; |
| 1208 | } |
| 1209 | |
| 1210 | if (buf[n] == ',') |
| 1211 | n++; |
| 1212 | |
| 1213 | if (epdrv->bufsize) { |
| 1214 | memcpy(epdrv->buffer, &buf[n], |
| 1215 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); |
| 1216 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; |
| 1217 | } |
| 1218 | } |
| 1219 | |
| 1220 | return 0; |
| 1221 | } |
| 1222 | |
| 1223 | /** |
| 1224 | * early_platform_add_devices - adds a number of early platform devices |
| 1225 | * @devs: array of early platform devices to add |
| 1226 | * @num: number of early platform devices in array |
| 1227 | * |
| 1228 | * Used by early architecture code to register early platform devices and |
| 1229 | * their platform data. |
| 1230 | */ |
| 1231 | void __init early_platform_add_devices(struct platform_device **devs, int num) |
| 1232 | { |
| 1233 | struct device *dev; |
| 1234 | int i; |
| 1235 | |
| 1236 | /* simply add the devices to list */ |
| 1237 | for (i = 0; i < num; i++) { |
| 1238 | dev = &devs[i]->dev; |
| 1239 | |
| 1240 | if (!dev->devres_head.next) { |
| 1241 | pm_runtime_early_init(dev); |
| 1242 | INIT_LIST_HEAD(&dev->devres_head); |
| 1243 | list_add_tail(&dev->devres_head, |
| 1244 | &early_platform_device_list); |
| 1245 | } |
| 1246 | } |
| 1247 | } |
| 1248 | |
| 1249 | /** |
| 1250 | * early_platform_driver_register_all - register early platform drivers |
| 1251 | * @class_str: string to identify early platform driver class |
| 1252 | * |
| 1253 | * Used by architecture code to register all early platform drivers |
| 1254 | * for a certain class. If omitted then only early platform drivers |
| 1255 | * with matching kernel command line class parameters will be registered. |
| 1256 | */ |
| 1257 | void __init early_platform_driver_register_all(char *class_str) |
| 1258 | { |
| 1259 | /* The "class_str" parameter may or may not be present on the kernel |
| 1260 | * command line. If it is present then there may be more than one |
| 1261 | * matching parameter. |
| 1262 | * |
| 1263 | * Since we register our early platform drivers using early_param() |
| 1264 | * we need to make sure that they also get registered in the case |
| 1265 | * when the parameter is missing from the kernel command line. |
| 1266 | * |
| 1267 | * We use parse_early_options() to make sure the early_param() gets |
| 1268 | * called at least once. The early_param() may be called more than |
| 1269 | * once since the name of the preferred device may be specified on |
| 1270 | * the kernel command line. early_platform_driver_register() handles |
| 1271 | * this case for us. |
| 1272 | */ |
| 1273 | parse_early_options(class_str); |
| 1274 | } |
| 1275 | |
| 1276 | /** |
| 1277 | * early_platform_match - find early platform device matching driver |
| 1278 | * @epdrv: early platform driver structure |
| 1279 | * @id: id to match against |
| 1280 | */ |
| 1281 | static struct platform_device * __init |
| 1282 | early_platform_match(struct early_platform_driver *epdrv, int id) |
| 1283 | { |
| 1284 | struct platform_device *pd; |
| 1285 | |
| 1286 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) |
| 1287 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) |
| 1288 | if (pd->id == id) |
| 1289 | return pd; |
| 1290 | |
| 1291 | return NULL; |
| 1292 | } |
| 1293 | |
| 1294 | /** |
| 1295 | * early_platform_left - check if early platform driver has matching devices |
| 1296 | * @epdrv: early platform driver structure |
| 1297 | * @id: return true if id or above exists |
| 1298 | */ |
| 1299 | static int __init early_platform_left(struct early_platform_driver *epdrv, |
| 1300 | int id) |
| 1301 | { |
| 1302 | struct platform_device *pd; |
| 1303 | |
| 1304 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) |
| 1305 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) |
| 1306 | if (pd->id >= id) |
| 1307 | return 1; |
| 1308 | |
| 1309 | return 0; |
| 1310 | } |
| 1311 | |
| 1312 | /** |
| 1313 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
| 1314 | * @class_str: string to identify early platform driver class |
| 1315 | * @id: id to match against |
| 1316 | * @nr_probe: number of platform devices to successfully probe before exiting |
| 1317 | */ |
| 1318 | static int __init early_platform_driver_probe_id(char *class_str, |
| 1319 | int id, |
| 1320 | int nr_probe) |
| 1321 | { |
| 1322 | struct early_platform_driver *epdrv; |
| 1323 | struct platform_device *match; |
| 1324 | int match_id; |
| 1325 | int n = 0; |
| 1326 | int left = 0; |
| 1327 | |
| 1328 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { |
| 1329 | /* only use drivers matching our class_str */ |
| 1330 | if (strcmp(class_str, epdrv->class_str)) |
| 1331 | continue; |
| 1332 | |
| 1333 | if (id == -2) { |
| 1334 | match_id = epdrv->requested_id; |
| 1335 | left = 1; |
| 1336 | |
| 1337 | } else { |
| 1338 | match_id = id; |
| 1339 | left += early_platform_left(epdrv, id); |
| 1340 | |
| 1341 | /* skip requested id */ |
| 1342 | switch (epdrv->requested_id) { |
| 1343 | case EARLY_PLATFORM_ID_ERROR: |
| 1344 | case EARLY_PLATFORM_ID_UNSET: |
| 1345 | break; |
| 1346 | default: |
| 1347 | if (epdrv->requested_id == id) |
| 1348 | match_id = EARLY_PLATFORM_ID_UNSET; |
| 1349 | } |
| 1350 | } |
| 1351 | |
| 1352 | switch (match_id) { |
| 1353 | case EARLY_PLATFORM_ID_ERROR: |
| 1354 | pr_warn("%s: unable to parse %s parameter\n", |
| 1355 | class_str, epdrv->pdrv->driver.name); |
| 1356 | /* fall-through */ |
| 1357 | case EARLY_PLATFORM_ID_UNSET: |
| 1358 | match = NULL; |
| 1359 | break; |
| 1360 | default: |
| 1361 | match = early_platform_match(epdrv, match_id); |
| 1362 | } |
| 1363 | |
| 1364 | if (match) { |
| 1365 | /* |
| 1366 | * Set up a sensible init_name to enable |
| 1367 | * dev_name() and others to be used before the |
| 1368 | * rest of the driver core is initialized. |
| 1369 | */ |
| 1370 | if (!match->dev.init_name && slab_is_available()) { |
| 1371 | if (match->id != -1) |
| 1372 | match->dev.init_name = |
| 1373 | kasprintf(GFP_KERNEL, "%s.%d", |
| 1374 | match->name, |
| 1375 | match->id); |
| 1376 | else |
| 1377 | match->dev.init_name = |
| 1378 | kasprintf(GFP_KERNEL, "%s", |
| 1379 | match->name); |
| 1380 | |
| 1381 | if (!match->dev.init_name) |
| 1382 | return -ENOMEM; |
| 1383 | } |
| 1384 | |
| 1385 | if (epdrv->pdrv->probe(match)) |
| 1386 | pr_warn("%s: unable to probe %s early.\n", |
| 1387 | class_str, match->name); |
| 1388 | else |
| 1389 | n++; |
| 1390 | } |
| 1391 | |
| 1392 | if (n >= nr_probe) |
| 1393 | break; |
| 1394 | } |
| 1395 | |
| 1396 | if (left) |
| 1397 | return n; |
| 1398 | else |
| 1399 | return -ENODEV; |
| 1400 | } |
| 1401 | |
| 1402 | /** |
| 1403 | * early_platform_driver_probe - probe a class of registered drivers |
| 1404 | * @class_str: string to identify early platform driver class |
| 1405 | * @nr_probe: number of platform devices to successfully probe before exiting |
| 1406 | * @user_only: only probe user specified early platform devices |
| 1407 | * |
| 1408 | * Used by architecture code to probe registered early platform drivers |
| 1409 | * within a certain class. For probe to happen a registered early platform |
| 1410 | * device matching a registered early platform driver is needed. |
| 1411 | */ |
| 1412 | int __init early_platform_driver_probe(char *class_str, |
| 1413 | int nr_probe, |
| 1414 | int user_only) |
| 1415 | { |
| 1416 | int k, n, i; |
| 1417 | |
| 1418 | n = 0; |
| 1419 | for (i = -2; n < nr_probe; i++) { |
| 1420 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); |
| 1421 | |
| 1422 | if (k < 0) |
| 1423 | break; |
| 1424 | |
| 1425 | n += k; |
| 1426 | |
| 1427 | if (user_only) |
| 1428 | break; |
| 1429 | } |
| 1430 | |
| 1431 | return n; |
| 1432 | } |
| 1433 | |
| 1434 | /** |
| 1435 | * early_platform_cleanup - clean up early platform code |
| 1436 | */ |
| 1437 | void __init early_platform_cleanup(void) |
| 1438 | { |
| 1439 | struct platform_device *pd, *pd2; |
| 1440 | |
| 1441 | /* clean up the devres list used to chain devices */ |
| 1442 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, |
| 1443 | dev.devres_head) { |
| 1444 | list_del(&pd->dev.devres_head); |
| 1445 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); |
| 1446 | } |
| 1447 | } |
| 1448 | |