Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Russell King | d052d1b | 2005-10-29 19:07:23 +0100 | [diff] [blame] | 13 | #include <linux/platform_device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/module.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/dma-mapping.h> |
| 17 | #include <linux/bootmem.h> |
| 18 | #include <linux/err.h> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 19 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
Ben Dooks | a1bdc7a | 2005-10-13 17:54:41 +0100 | [diff] [blame] | 21 | #include "base.h" |
| 22 | |
Russell King | 00d3dcd | 2005-11-09 17:23:39 +0000 | [diff] [blame] | 23 | #define to_platform_driver(drv) (container_of((drv), struct platform_driver, driver)) |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | struct device platform_bus = { |
| 26 | .bus_id = "platform", |
| 27 | }; |
Dmitry Torokhov | a96b204 | 2005-12-10 01:36:28 -0500 | [diff] [blame] | 28 | EXPORT_SYMBOL_GPL(platform_bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
| 30 | /** |
| 31 | * platform_get_resource - get a resource for a device |
| 32 | * @dev: platform device |
| 33 | * @type: resource type |
| 34 | * @num: resource index |
| 35 | */ |
| 36 | struct resource * |
| 37 | platform_get_resource(struct platform_device *dev, unsigned int type, |
| 38 | unsigned int num) |
| 39 | { |
| 40 | int i; |
| 41 | |
| 42 | for (i = 0; i < dev->num_resources; i++) { |
| 43 | struct resource *r = &dev->resource[i]; |
| 44 | |
| 45 | if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM| |
| 46 | IORESOURCE_IRQ|IORESOURCE_DMA)) |
| 47 | == type) |
| 48 | if (num-- == 0) |
| 49 | return r; |
| 50 | } |
| 51 | return NULL; |
| 52 | } |
Dmitry Torokhov | a96b204 | 2005-12-10 01:36:28 -0500 | [diff] [blame] | 53 | EXPORT_SYMBOL_GPL(platform_get_resource); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
| 55 | /** |
| 56 | * platform_get_irq - get an IRQ for a device |
| 57 | * @dev: platform device |
| 58 | * @num: IRQ number index |
| 59 | */ |
| 60 | int platform_get_irq(struct platform_device *dev, unsigned int num) |
| 61 | { |
| 62 | struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); |
| 63 | |
| 64 | return r ? r->start : 0; |
| 65 | } |
Dmitry Torokhov | a96b204 | 2005-12-10 01:36:28 -0500 | [diff] [blame] | 66 | EXPORT_SYMBOL_GPL(platform_get_irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
| 68 | /** |
| 69 | * platform_get_resource_byname - get a resource for a device by name |
| 70 | * @dev: platform device |
| 71 | * @type: resource type |
| 72 | * @name: resource name |
| 73 | */ |
| 74 | struct resource * |
| 75 | platform_get_resource_byname(struct platform_device *dev, unsigned int type, |
| 76 | char *name) |
| 77 | { |
| 78 | int i; |
| 79 | |
| 80 | for (i = 0; i < dev->num_resources; i++) { |
| 81 | struct resource *r = &dev->resource[i]; |
| 82 | |
| 83 | if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM| |
| 84 | IORESOURCE_IRQ|IORESOURCE_DMA)) == type) |
| 85 | if (!strcmp(r->name, name)) |
| 86 | return r; |
| 87 | } |
| 88 | return NULL; |
| 89 | } |
Dmitry Torokhov | a96b204 | 2005-12-10 01:36:28 -0500 | [diff] [blame] | 90 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
| 92 | /** |
| 93 | * platform_get_irq - get an IRQ for a device |
| 94 | * @dev: platform device |
| 95 | * @name: IRQ name |
| 96 | */ |
| 97 | int platform_get_irq_byname(struct platform_device *dev, char *name) |
| 98 | { |
| 99 | struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name); |
| 100 | |
| 101 | return r ? r->start : 0; |
| 102 | } |
Dmitry Torokhov | a96b204 | 2005-12-10 01:36:28 -0500 | [diff] [blame] | 103 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
| 105 | /** |
| 106 | * platform_add_devices - add a numbers of platform devices |
| 107 | * @devs: array of platform devices to add |
| 108 | * @num: number of platform devices in array |
| 109 | */ |
| 110 | int platform_add_devices(struct platform_device **devs, int num) |
| 111 | { |
| 112 | int i, ret = 0; |
| 113 | |
| 114 | for (i = 0; i < num; i++) { |
| 115 | ret = platform_device_register(devs[i]); |
| 116 | if (ret) { |
| 117 | while (--i >= 0) |
| 118 | platform_device_unregister(devs[i]); |
| 119 | break; |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | return ret; |
| 124 | } |
Dmitry Torokhov | a96b204 | 2005-12-10 01:36:28 -0500 | [diff] [blame] | 125 | EXPORT_SYMBOL_GPL(platform_add_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
Russell King | 37c12e7 | 2005-11-05 21:19:33 +0000 | [diff] [blame] | 127 | struct platform_object { |
| 128 | struct platform_device pdev; |
| 129 | char name[1]; |
| 130 | }; |
| 131 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | /** |
Russell King | 37c12e7 | 2005-11-05 21:19:33 +0000 | [diff] [blame] | 133 | * platform_device_put |
| 134 | * @pdev: platform device to free |
| 135 | * |
| 136 | * Free all memory associated with a platform device. This function |
| 137 | * must _only_ be externally called in error cases. All other usage |
| 138 | * is a bug. |
| 139 | */ |
| 140 | void platform_device_put(struct platform_device *pdev) |
| 141 | { |
| 142 | if (pdev) |
| 143 | put_device(&pdev->dev); |
| 144 | } |
| 145 | EXPORT_SYMBOL_GPL(platform_device_put); |
| 146 | |
| 147 | static void platform_device_release(struct device *dev) |
| 148 | { |
| 149 | struct platform_object *pa = container_of(dev, struct platform_object, pdev.dev); |
| 150 | |
| 151 | kfree(pa->pdev.dev.platform_data); |
| 152 | kfree(pa->pdev.resource); |
| 153 | kfree(pa); |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * platform_device_alloc |
| 158 | * @name: base name of the device we're adding |
| 159 | * @id: instance id |
| 160 | * |
| 161 | * Create a platform device object which can have other objects attached |
| 162 | * to it, and which will have attached objects freed when it is released. |
| 163 | */ |
| 164 | struct platform_device *platform_device_alloc(const char *name, unsigned int id) |
| 165 | { |
| 166 | struct platform_object *pa; |
| 167 | |
| 168 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); |
| 169 | if (pa) { |
| 170 | strcpy(pa->name, name); |
| 171 | pa->pdev.name = pa->name; |
| 172 | pa->pdev.id = id; |
| 173 | device_initialize(&pa->pdev.dev); |
| 174 | pa->pdev.dev.release = platform_device_release; |
| 175 | } |
| 176 | |
Dmitry Torokhov | 93ce306 | 2005-12-10 01:36:27 -0500 | [diff] [blame] | 177 | return pa ? &pa->pdev : NULL; |
Russell King | 37c12e7 | 2005-11-05 21:19:33 +0000 | [diff] [blame] | 178 | } |
| 179 | EXPORT_SYMBOL_GPL(platform_device_alloc); |
| 180 | |
| 181 | /** |
| 182 | * platform_device_add_resources |
| 183 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
| 184 | * @res: set of resources that needs to be allocated for the device |
| 185 | * @num: number of resources |
| 186 | * |
| 187 | * Add a copy of the resources to the platform device. The memory |
| 188 | * associated with the resources will be freed when the platform |
| 189 | * device is released. |
| 190 | */ |
| 191 | int platform_device_add_resources(struct platform_device *pdev, struct resource *res, unsigned int num) |
| 192 | { |
| 193 | struct resource *r; |
| 194 | |
| 195 | r = kmalloc(sizeof(struct resource) * num, GFP_KERNEL); |
| 196 | if (r) { |
| 197 | memcpy(r, res, sizeof(struct resource) * num); |
| 198 | pdev->resource = r; |
| 199 | pdev->num_resources = num; |
| 200 | } |
| 201 | return r ? 0 : -ENOMEM; |
| 202 | } |
| 203 | EXPORT_SYMBOL_GPL(platform_device_add_resources); |
| 204 | |
| 205 | /** |
| 206 | * platform_device_add_data |
| 207 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
| 208 | * @data: platform specific data for this platform device |
| 209 | * @size: size of platform specific data |
| 210 | * |
| 211 | * Add a copy of platform specific data to the platform device's platform_data |
| 212 | * pointer. The memory associated with the platform data will be freed |
| 213 | * when the platform device is released. |
| 214 | */ |
| 215 | int platform_device_add_data(struct platform_device *pdev, void *data, size_t size) |
| 216 | { |
| 217 | void *d; |
| 218 | |
| 219 | d = kmalloc(size, GFP_KERNEL); |
| 220 | if (d) { |
| 221 | memcpy(d, data, size); |
| 222 | pdev->dev.platform_data = d; |
| 223 | } |
| 224 | return d ? 0 : -ENOMEM; |
| 225 | } |
| 226 | EXPORT_SYMBOL_GPL(platform_device_add_data); |
| 227 | |
| 228 | /** |
| 229 | * platform_device_add - add a platform device to device hierarchy |
Martin Waitz | 67be2dd | 2005-05-01 08:59:26 -0700 | [diff] [blame] | 230 | * @pdev: platform device we're adding |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | * |
Russell King | 37c12e7 | 2005-11-05 21:19:33 +0000 | [diff] [blame] | 232 | * This is part 2 of platform_device_register(), though may be called |
| 233 | * separately _iff_ pdev was allocated by platform_device_alloc(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | */ |
Russell King | 37c12e7 | 2005-11-05 21:19:33 +0000 | [diff] [blame] | 235 | int platform_device_add(struct platform_device *pdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | { |
| 237 | int i, ret = 0; |
| 238 | |
| 239 | if (!pdev) |
| 240 | return -EINVAL; |
| 241 | |
| 242 | if (!pdev->dev.parent) |
| 243 | pdev->dev.parent = &platform_bus; |
| 244 | |
| 245 | pdev->dev.bus = &platform_bus_type; |
| 246 | |
| 247 | if (pdev->id != -1) |
| 248 | snprintf(pdev->dev.bus_id, BUS_ID_SIZE, "%s.%u", pdev->name, pdev->id); |
| 249 | else |
| 250 | strlcpy(pdev->dev.bus_id, pdev->name, BUS_ID_SIZE); |
| 251 | |
| 252 | for (i = 0; i < pdev->num_resources; i++) { |
| 253 | struct resource *p, *r = &pdev->resource[i]; |
| 254 | |
| 255 | if (r->name == NULL) |
| 256 | r->name = pdev->dev.bus_id; |
| 257 | |
| 258 | p = r->parent; |
| 259 | if (!p) { |
| 260 | if (r->flags & IORESOURCE_MEM) |
| 261 | p = &iomem_resource; |
| 262 | else if (r->flags & IORESOURCE_IO) |
| 263 | p = &ioport_resource; |
| 264 | } |
| 265 | |
Kumar Gala | d960bb4 | 2005-11-28 10:15:39 -0600 | [diff] [blame] | 266 | if (p && insert_resource(p, r)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | printk(KERN_ERR |
| 268 | "%s: failed to claim resource %d\n", |
| 269 | pdev->dev.bus_id, i); |
| 270 | ret = -EBUSY; |
| 271 | goto failed; |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | pr_debug("Registering platform device '%s'. Parent at %s\n", |
| 276 | pdev->dev.bus_id, pdev->dev.parent->bus_id); |
| 277 | |
| 278 | ret = device_register(&pdev->dev); |
| 279 | if (ret == 0) |
| 280 | return ret; |
| 281 | |
| 282 | failed: |
| 283 | while (--i >= 0) |
| 284 | if (pdev->resource[i].flags & (IORESOURCE_MEM|IORESOURCE_IO)) |
| 285 | release_resource(&pdev->resource[i]); |
| 286 | return ret; |
| 287 | } |
Russell King | 37c12e7 | 2005-11-05 21:19:33 +0000 | [diff] [blame] | 288 | EXPORT_SYMBOL_GPL(platform_device_add); |
| 289 | |
| 290 | /** |
Dmitry Torokhov | 93ce306 | 2005-12-10 01:36:27 -0500 | [diff] [blame] | 291 | * platform_device_del - remove a platform-level device |
| 292 | * @pdev: platform device we're removing |
| 293 | * |
| 294 | * Note that this function will also release all memory- and port-based |
| 295 | * resources owned by the device (@dev->resource). |
| 296 | */ |
| 297 | void platform_device_del(struct platform_device *pdev) |
| 298 | { |
| 299 | int i; |
| 300 | |
| 301 | if (pdev) { |
| 302 | for (i = 0; i < pdev->num_resources; i++) { |
| 303 | struct resource *r = &pdev->resource[i]; |
| 304 | if (r->flags & (IORESOURCE_MEM|IORESOURCE_IO)) |
| 305 | release_resource(r); |
| 306 | } |
| 307 | |
| 308 | device_del(&pdev->dev); |
| 309 | } |
| 310 | } |
| 311 | EXPORT_SYMBOL_GPL(platform_device_del); |
| 312 | |
| 313 | /** |
Russell King | 37c12e7 | 2005-11-05 21:19:33 +0000 | [diff] [blame] | 314 | * platform_device_register - add a platform-level device |
| 315 | * @pdev: platform device we're adding |
| 316 | * |
| 317 | */ |
| 318 | int platform_device_register(struct platform_device * pdev) |
| 319 | { |
| 320 | device_initialize(&pdev->dev); |
| 321 | return platform_device_add(pdev); |
| 322 | } |
Dmitry Torokhov | a96b204 | 2005-12-10 01:36:28 -0500 | [diff] [blame] | 323 | EXPORT_SYMBOL_GPL(platform_device_register); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | |
| 325 | /** |
Dmitry Torokhov | 93ce306 | 2005-12-10 01:36:27 -0500 | [diff] [blame] | 326 | * platform_device_unregister - unregister a platform-level device |
| 327 | * @pdev: platform device we're unregistering |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | * |
Dmitry Torokhov | 93ce306 | 2005-12-10 01:36:27 -0500 | [diff] [blame] | 329 | * Unregistration is done in 2 steps. Fisrt we release all resources |
Jean Delvare | 2d7b5a7 | 2005-12-27 19:45:58 +0100 | [diff] [blame] | 330 | * and remove it from the subsystem, then we drop reference count by |
Dmitry Torokhov | 93ce306 | 2005-12-10 01:36:27 -0500 | [diff] [blame] | 331 | * calling platform_device_put(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | */ |
| 333 | void platform_device_unregister(struct platform_device * pdev) |
| 334 | { |
Dmitry Torokhov | 93ce306 | 2005-12-10 01:36:27 -0500 | [diff] [blame] | 335 | platform_device_del(pdev); |
| 336 | platform_device_put(pdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | } |
Dmitry Torokhov | a96b204 | 2005-12-10 01:36:28 -0500 | [diff] [blame] | 338 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | /** |
| 341 | * platform_device_register_simple |
| 342 | * @name: base name of the device we're adding |
| 343 | * @id: instance id |
| 344 | * @res: set of resources that needs to be allocated for the device |
| 345 | * @num: number of resources |
| 346 | * |
| 347 | * This function creates a simple platform device that requires minimal |
| 348 | * resource and memory management. Canned release function freeing |
| 349 | * memory allocated for the device allows drivers using such devices |
| 350 | * to be unloaded iwithout waiting for the last reference to the device |
| 351 | * to be dropped. |
| 352 | */ |
| 353 | struct platform_device *platform_device_register_simple(char *name, unsigned int id, |
| 354 | struct resource *res, unsigned int num) |
| 355 | { |
Russell King | 37c12e7 | 2005-11-05 21:19:33 +0000 | [diff] [blame] | 356 | struct platform_device *pdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | int retval; |
| 358 | |
Russell King | 37c12e7 | 2005-11-05 21:19:33 +0000 | [diff] [blame] | 359 | pdev = platform_device_alloc(name, id); |
| 360 | if (!pdev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | retval = -ENOMEM; |
| 362 | goto error; |
| 363 | } |
| 364 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | if (num) { |
Russell King | 37c12e7 | 2005-11-05 21:19:33 +0000 | [diff] [blame] | 366 | retval = platform_device_add_resources(pdev, res, num); |
| 367 | if (retval) |
| 368 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | } |
| 370 | |
Russell King | 37c12e7 | 2005-11-05 21:19:33 +0000 | [diff] [blame] | 371 | retval = platform_device_add(pdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | if (retval) |
| 373 | goto error; |
| 374 | |
Russell King | 37c12e7 | 2005-11-05 21:19:33 +0000 | [diff] [blame] | 375 | return pdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
| 377 | error: |
Russell King | 37c12e7 | 2005-11-05 21:19:33 +0000 | [diff] [blame] | 378 | platform_device_put(pdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | return ERR_PTR(retval); |
| 380 | } |
Dmitry Torokhov | a96b204 | 2005-12-10 01:36:28 -0500 | [diff] [blame] | 381 | EXPORT_SYMBOL_GPL(platform_device_register_simple); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
Russell King | 00d3dcd | 2005-11-09 17:23:39 +0000 | [diff] [blame] | 383 | static int platform_drv_probe(struct device *_dev) |
| 384 | { |
| 385 | struct platform_driver *drv = to_platform_driver(_dev->driver); |
| 386 | struct platform_device *dev = to_platform_device(_dev); |
| 387 | |
| 388 | return drv->probe(dev); |
| 389 | } |
| 390 | |
| 391 | static int platform_drv_remove(struct device *_dev) |
| 392 | { |
| 393 | struct platform_driver *drv = to_platform_driver(_dev->driver); |
| 394 | struct platform_device *dev = to_platform_device(_dev); |
| 395 | |
| 396 | return drv->remove(dev); |
| 397 | } |
| 398 | |
| 399 | static void platform_drv_shutdown(struct device *_dev) |
| 400 | { |
| 401 | struct platform_driver *drv = to_platform_driver(_dev->driver); |
| 402 | struct platform_device *dev = to_platform_device(_dev); |
| 403 | |
| 404 | drv->shutdown(dev); |
| 405 | } |
| 406 | |
| 407 | static int platform_drv_suspend(struct device *_dev, pm_message_t state) |
| 408 | { |
| 409 | struct platform_driver *drv = to_platform_driver(_dev->driver); |
| 410 | struct platform_device *dev = to_platform_device(_dev); |
| 411 | |
| 412 | return drv->suspend(dev, state); |
| 413 | } |
| 414 | |
| 415 | static int platform_drv_resume(struct device *_dev) |
| 416 | { |
| 417 | struct platform_driver *drv = to_platform_driver(_dev->driver); |
| 418 | struct platform_device *dev = to_platform_device(_dev); |
| 419 | |
| 420 | return drv->resume(dev); |
| 421 | } |
| 422 | |
| 423 | /** |
| 424 | * platform_driver_register |
| 425 | * @drv: platform driver structure |
| 426 | */ |
| 427 | int platform_driver_register(struct platform_driver *drv) |
| 428 | { |
| 429 | drv->driver.bus = &platform_bus_type; |
| 430 | if (drv->probe) |
| 431 | drv->driver.probe = platform_drv_probe; |
| 432 | if (drv->remove) |
| 433 | drv->driver.remove = platform_drv_remove; |
| 434 | if (drv->shutdown) |
| 435 | drv->driver.shutdown = platform_drv_shutdown; |
| 436 | if (drv->suspend) |
| 437 | drv->driver.suspend = platform_drv_suspend; |
| 438 | if (drv->resume) |
| 439 | drv->driver.resume = platform_drv_resume; |
| 440 | return driver_register(&drv->driver); |
| 441 | } |
| 442 | EXPORT_SYMBOL_GPL(platform_driver_register); |
| 443 | |
| 444 | /** |
| 445 | * platform_driver_unregister |
| 446 | * @drv: platform driver structure |
| 447 | */ |
| 448 | void platform_driver_unregister(struct platform_driver *drv) |
| 449 | { |
| 450 | driver_unregister(&drv->driver); |
| 451 | } |
| 452 | EXPORT_SYMBOL_GPL(platform_driver_unregister); |
| 453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
| 455 | /** |
| 456 | * platform_match - bind platform device to platform driver. |
| 457 | * @dev: device. |
| 458 | * @drv: driver. |
| 459 | * |
| 460 | * Platform device IDs are assumed to be encoded like this: |
| 461 | * "<name><instance>", where <name> is a short description of the |
| 462 | * type of device, like "pci" or "floppy", and <instance> is the |
| 463 | * enumerated instance of the device, like '0' or '42'. |
| 464 | * Driver IDs are simply "<name>". |
| 465 | * So, extract the <name> from the platform_device structure, |
| 466 | * and compare it against the name of the driver. Return whether |
| 467 | * they match or not. |
| 468 | */ |
| 469 | |
| 470 | static int platform_match(struct device * dev, struct device_driver * drv) |
| 471 | { |
| 472 | struct platform_device *pdev = container_of(dev, struct platform_device, dev); |
| 473 | |
| 474 | return (strncmp(pdev->name, drv->name, BUS_ID_SIZE) == 0); |
| 475 | } |
| 476 | |
| 477 | static int platform_suspend(struct device * dev, pm_message_t state) |
| 478 | { |
| 479 | int ret = 0; |
| 480 | |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 481 | if (dev->driver && dev->driver->suspend) |
| 482 | ret = dev->driver->suspend(dev, state); |
| 483 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | return ret; |
| 485 | } |
| 486 | |
| 487 | static int platform_resume(struct device * dev) |
| 488 | { |
| 489 | int ret = 0; |
| 490 | |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 491 | if (dev->driver && dev->driver->resume) |
| 492 | ret = dev->driver->resume(dev); |
| 493 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | return ret; |
| 495 | } |
| 496 | |
| 497 | struct bus_type platform_bus_type = { |
| 498 | .name = "platform", |
| 499 | .match = platform_match, |
| 500 | .suspend = platform_suspend, |
| 501 | .resume = platform_resume, |
| 502 | }; |
Dmitry Torokhov | a96b204 | 2005-12-10 01:36:28 -0500 | [diff] [blame] | 503 | EXPORT_SYMBOL_GPL(platform_bus_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | |
| 505 | int __init platform_bus_init(void) |
| 506 | { |
| 507 | device_register(&platform_bus); |
| 508 | return bus_register(&platform_bus_type); |
| 509 | } |
| 510 | |
| 511 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK |
| 512 | u64 dma_get_required_mask(struct device *dev) |
| 513 | { |
| 514 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); |
| 515 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); |
| 516 | u64 mask; |
| 517 | |
| 518 | if (!high_totalram) { |
| 519 | /* convert to mask just covering totalram */ |
| 520 | low_totalram = (1 << (fls(low_totalram) - 1)); |
| 521 | low_totalram += low_totalram - 1; |
| 522 | mask = low_totalram; |
| 523 | } else { |
| 524 | high_totalram = (1 << (fls(high_totalram) - 1)); |
| 525 | high_totalram += high_totalram - 1; |
| 526 | mask = (((u64)high_totalram) << 32) + 0xffffffff; |
| 527 | } |
| 528 | return mask & *dev->dma_mask; |
| 529 | } |
| 530 | EXPORT_SYMBOL_GPL(dma_get_required_mask); |
| 531 | #endif |