blob: 911ec600fe71dec287cf922441a8cf53855ecf3f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 Kingd052d1b2005-10-29 19:07:23 +010013#include <linux/platform_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#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 Schmielau4e57b682005-10-30 15:03:48 -080019#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
Ben Dooksa1bdc7a2005-10-13 17:54:41 +010021#include "base.h"
22
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080023#define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
24 driver))
Russell King00d3dcd2005-11-09 17:23:39 +000025
Linus Torvalds1da177e2005-04-16 15:20:36 -070026struct device platform_bus = {
27 .bus_id = "platform",
28};
Dmitry Torokhova96b2042005-12-10 01:36:28 -050029EXPORT_SYMBOL_GPL(platform_bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
31/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080032 * platform_get_resource - get a resource for a device
33 * @dev: platform device
34 * @type: resource type
35 * @num: resource index
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080037struct resource *platform_get_resource(struct platform_device *dev,
38 unsigned int type, unsigned int num)
Linus Torvalds1da177e2005-04-16 15:20:36 -070039{
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|
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080046 IORESOURCE_IRQ|IORESOURCE_DMA)) == type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 if (num-- == 0)
48 return r;
49 }
50 return NULL;
51}
Dmitry Torokhova96b2042005-12-10 01:36:28 -050052EXPORT_SYMBOL_GPL(platform_get_resource);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080055 * platform_get_irq - get an IRQ for a device
56 * @dev: platform device
57 * @num: IRQ number index
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 */
59int platform_get_irq(struct platform_device *dev, unsigned int num)
60{
61 struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
62
David Vrabel305b3222006-01-19 17:52:27 +000063 return r ? r->start : -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064}
Dmitry Torokhova96b2042005-12-10 01:36:28 -050065EXPORT_SYMBOL_GPL(platform_get_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
67/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080068 * platform_get_resource_byname - get a resource for a device by name
69 * @dev: platform device
70 * @type: resource type
71 * @name: resource name
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080073struct resource *platform_get_resource_byname(struct platform_device *dev,
74 unsigned int type, char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075{
76 int i;
77
78 for (i = 0; i < dev->num_resources; i++) {
79 struct resource *r = &dev->resource[i];
80
81 if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM|
82 IORESOURCE_IRQ|IORESOURCE_DMA)) == type)
83 if (!strcmp(r->name, name))
84 return r;
85 }
86 return NULL;
87}
Dmitry Torokhova96b2042005-12-10 01:36:28 -050088EXPORT_SYMBOL_GPL(platform_get_resource_byname);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
90/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080091 * platform_get_irq - get an IRQ for a device
92 * @dev: platform device
93 * @name: IRQ name
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 */
95int platform_get_irq_byname(struct platform_device *dev, char *name)
96{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080097 struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
98 name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
David Vrabel305b3222006-01-19 17:52:27 +0000100 return r ? r->start : -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500102EXPORT_SYMBOL_GPL(platform_get_irq_byname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
104/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800105 * platform_add_devices - add a numbers of platform devices
106 * @devs: array of platform devices to add
107 * @num: number of platform devices in array
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 */
109int platform_add_devices(struct platform_device **devs, int num)
110{
111 int i, ret = 0;
112
113 for (i = 0; i < num; i++) {
114 ret = platform_device_register(devs[i]);
115 if (ret) {
116 while (--i >= 0)
117 platform_device_unregister(devs[i]);
118 break;
119 }
120 }
121
122 return ret;
123}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500124EXPORT_SYMBOL_GPL(platform_add_devices);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Russell King37c12e72005-11-05 21:19:33 +0000126struct platform_object {
127 struct platform_device pdev;
128 char name[1];
129};
130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800132 * platform_device_put
133 * @pdev: platform device to free
Russell King37c12e72005-11-05 21:19:33 +0000134 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800135 * Free all memory associated with a platform device. This function must
136 * _only_ be externally called in error cases. All other usage is a bug.
Russell King37c12e72005-11-05 21:19:33 +0000137 */
138void platform_device_put(struct platform_device *pdev)
139{
140 if (pdev)
141 put_device(&pdev->dev);
142}
143EXPORT_SYMBOL_GPL(platform_device_put);
144
145static void platform_device_release(struct device *dev)
146{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800147 struct platform_object *pa = container_of(dev, struct platform_object,
148 pdev.dev);
Russell King37c12e72005-11-05 21:19:33 +0000149
150 kfree(pa->pdev.dev.platform_data);
151 kfree(pa->pdev.resource);
152 kfree(pa);
153}
154
155/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800156 * platform_device_alloc
157 * @name: base name of the device we're adding
158 * @id: instance id
Russell King37c12e72005-11-05 21:19:33 +0000159 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800160 * Create a platform device object which can have other objects attached
161 * to it, and which will have attached objects freed when it is released.
Russell King37c12e72005-11-05 21:19:33 +0000162 */
Jean Delvare1359555e2007-09-09 12:54:16 +0200163struct platform_device *platform_device_alloc(const char *name, int id)
Russell King37c12e72005-11-05 21:19:33 +0000164{
165 struct platform_object *pa;
166
167 pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
168 if (pa) {
169 strcpy(pa->name, name);
170 pa->pdev.name = pa->name;
171 pa->pdev.id = id;
172 device_initialize(&pa->pdev.dev);
173 pa->pdev.dev.release = platform_device_release;
174 }
175
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500176 return pa ? &pa->pdev : NULL;
Russell King37c12e72005-11-05 21:19:33 +0000177}
178EXPORT_SYMBOL_GPL(platform_device_alloc);
179
180/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800181 * platform_device_add_resources
182 * @pdev: platform device allocated by platform_device_alloc to add resources to
183 * @res: set of resources that needs to be allocated for the device
184 * @num: number of resources
Russell King37c12e72005-11-05 21:19:33 +0000185 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800186 * Add a copy of the resources to the platform device. The memory
187 * associated with the resources will be freed when the platform device is
188 * released.
Russell King37c12e72005-11-05 21:19:33 +0000189 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800190int platform_device_add_resources(struct platform_device *pdev,
191 struct resource *res, unsigned int num)
Russell King37c12e72005-11-05 21:19:33 +0000192{
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}
203EXPORT_SYMBOL_GPL(platform_device_add_resources);
204
205/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800206 * 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
Russell King37c12e72005-11-05 21:19:33 +0000210 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800211 * Add a copy of platform specific data to the platform device's
212 * platform_data pointer. The memory associated with the platform data
213 * will be freed when the platform device is released.
Russell King37c12e72005-11-05 21:19:33 +0000214 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800215int platform_device_add_data(struct platform_device *pdev, const void *data,
216 size_t size)
Russell King37c12e72005-11-05 21:19:33 +0000217{
218 void *d;
219
220 d = kmalloc(size, GFP_KERNEL);
221 if (d) {
222 memcpy(d, data, size);
223 pdev->dev.platform_data = d;
224 }
225 return d ? 0 : -ENOMEM;
226}
227EXPORT_SYMBOL_GPL(platform_device_add_data);
228
229/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800230 * platform_device_add - add a platform device to device hierarchy
231 * @pdev: platform device we're adding
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800233 * This is part 2 of platform_device_register(), though may be called
234 * separately _iff_ pdev was allocated by platform_device_alloc().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 */
Russell King37c12e72005-11-05 21:19:33 +0000236int platform_device_add(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237{
238 int i, ret = 0;
239
240 if (!pdev)
241 return -EINVAL;
242
243 if (!pdev->dev.parent)
244 pdev->dev.parent = &platform_bus;
245
246 pdev->dev.bus = &platform_bus_type;
247
248 if (pdev->id != -1)
Jean Delvare1359555e2007-09-09 12:54:16 +0200249 snprintf(pdev->dev.bus_id, BUS_ID_SIZE, "%s.%d", pdev->name,
250 pdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 else
252 strlcpy(pdev->dev.bus_id, pdev->name, BUS_ID_SIZE);
253
254 for (i = 0; i < pdev->num_resources; i++) {
255 struct resource *p, *r = &pdev->resource[i];
256
257 if (r->name == NULL)
258 r->name = pdev->dev.bus_id;
259
260 p = r->parent;
261 if (!p) {
262 if (r->flags & IORESOURCE_MEM)
263 p = &iomem_resource;
264 else if (r->flags & IORESOURCE_IO)
265 p = &ioport_resource;
266 }
267
Kumar Galad960bb42005-11-28 10:15:39 -0600268 if (p && insert_resource(p, r)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 printk(KERN_ERR
270 "%s: failed to claim resource %d\n",
271 pdev->dev.bus_id, i);
272 ret = -EBUSY;
273 goto failed;
274 }
275 }
276
277 pr_debug("Registering platform device '%s'. Parent at %s\n",
278 pdev->dev.bus_id, pdev->dev.parent->bus_id);
279
Russell Kinge3915532006-05-06 08:15:26 +0100280 ret = device_add(&pdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 if (ret == 0)
282 return ret;
283
284 failed:
285 while (--i >= 0)
286 if (pdev->resource[i].flags & (IORESOURCE_MEM|IORESOURCE_IO))
287 release_resource(&pdev->resource[i]);
288 return ret;
289}
Russell King37c12e72005-11-05 21:19:33 +0000290EXPORT_SYMBOL_GPL(platform_device_add);
291
292/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800293 * platform_device_del - remove a platform-level device
294 * @pdev: platform device we're removing
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500295 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800296 * Note that this function will also release all memory- and port-based
297 * resources owned by the device (@dev->resource). This function must
298 * _only_ be externally called in error cases. All other usage is a bug.
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500299 */
300void platform_device_del(struct platform_device *pdev)
301{
302 int i;
303
304 if (pdev) {
Jean Delvaredc4c15d2007-05-02 20:55:54 +0200305 device_del(&pdev->dev);
306
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500307 for (i = 0; i < pdev->num_resources; i++) {
308 struct resource *r = &pdev->resource[i];
309 if (r->flags & (IORESOURCE_MEM|IORESOURCE_IO))
310 release_resource(r);
311 }
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500312 }
313}
314EXPORT_SYMBOL_GPL(platform_device_del);
315
316/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800317 * platform_device_register - add a platform-level device
318 * @pdev: platform device we're adding
Russell King37c12e72005-11-05 21:19:33 +0000319 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800320int platform_device_register(struct platform_device *pdev)
Russell King37c12e72005-11-05 21:19:33 +0000321{
322 device_initialize(&pdev->dev);
323 return platform_device_add(pdev);
324}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500325EXPORT_SYMBOL_GPL(platform_device_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800328 * platform_device_unregister - unregister a platform-level device
329 * @pdev: platform device we're unregistering
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800331 * Unregistration is done in 2 steps. First we release all resources
332 * and remove it from the subsystem, then we drop reference count by
333 * calling platform_device_put().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800335void platform_device_unregister(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336{
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500337 platform_device_del(pdev);
338 platform_device_put(pdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500340EXPORT_SYMBOL_GPL(platform_device_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800343 * platform_device_register_simple
344 * @name: base name of the device we're adding
345 * @id: instance id
346 * @res: set of resources that needs to be allocated for the device
347 * @num: number of resources
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800349 * This function creates a simple platform device that requires minimal
350 * resource and memory management. Canned release function freeing memory
351 * allocated for the device allows drivers using such devices to be
352 * unloaded without waiting for the last reference to the device to be
353 * dropped.
David Brownell49a4ec12007-05-08 00:29:39 -0700354 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800355 * This interface is primarily intended for use with legacy drivers which
356 * probe hardware directly. Because such drivers create sysfs device nodes
357 * themselves, rather than letting system infrastructure handle such device
358 * enumeration tasks, they don't fully conform to the Linux driver model.
359 * In particular, when such drivers are built as modules, they can't be
360 * "hotplugged".
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800362struct platform_device *platform_device_register_simple(const char *name,
363 int id,
364 struct resource *res,
365 unsigned int num)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366{
Russell King37c12e72005-11-05 21:19:33 +0000367 struct platform_device *pdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 int retval;
369
Russell King37c12e72005-11-05 21:19:33 +0000370 pdev = platform_device_alloc(name, id);
371 if (!pdev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 retval = -ENOMEM;
373 goto error;
374 }
375
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 if (num) {
Russell King37c12e72005-11-05 21:19:33 +0000377 retval = platform_device_add_resources(pdev, res, num);
378 if (retval)
379 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 }
381
Russell King37c12e72005-11-05 21:19:33 +0000382 retval = platform_device_add(pdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 if (retval)
384 goto error;
385
Russell King37c12e72005-11-05 21:19:33 +0000386 return pdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
388error:
Russell King37c12e72005-11-05 21:19:33 +0000389 platform_device_put(pdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 return ERR_PTR(retval);
391}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500392EXPORT_SYMBOL_GPL(platform_device_register_simple);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Russell King00d3dcd2005-11-09 17:23:39 +0000394static int platform_drv_probe(struct device *_dev)
395{
396 struct platform_driver *drv = to_platform_driver(_dev->driver);
397 struct platform_device *dev = to_platform_device(_dev);
398
399 return drv->probe(dev);
400}
401
David Brownellc67334f2006-11-16 23:28:47 -0800402static int platform_drv_probe_fail(struct device *_dev)
403{
404 return -ENXIO;
405}
406
Russell King00d3dcd2005-11-09 17:23:39 +0000407static int platform_drv_remove(struct device *_dev)
408{
409 struct platform_driver *drv = to_platform_driver(_dev->driver);
410 struct platform_device *dev = to_platform_device(_dev);
411
412 return drv->remove(dev);
413}
414
415static void platform_drv_shutdown(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 drv->shutdown(dev);
421}
422
423static int platform_drv_suspend(struct device *_dev, pm_message_t state)
424{
425 struct platform_driver *drv = to_platform_driver(_dev->driver);
426 struct platform_device *dev = to_platform_device(_dev);
427
428 return drv->suspend(dev, state);
429}
430
431static int platform_drv_resume(struct device *_dev)
432{
433 struct platform_driver *drv = to_platform_driver(_dev->driver);
434 struct platform_device *dev = to_platform_device(_dev);
435
436 return drv->resume(dev);
437}
438
439/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800440 * platform_driver_register
441 * @drv: platform driver structure
Russell King00d3dcd2005-11-09 17:23:39 +0000442 */
443int platform_driver_register(struct platform_driver *drv)
444{
445 drv->driver.bus = &platform_bus_type;
446 if (drv->probe)
447 drv->driver.probe = platform_drv_probe;
448 if (drv->remove)
449 drv->driver.remove = platform_drv_remove;
450 if (drv->shutdown)
451 drv->driver.shutdown = platform_drv_shutdown;
452 if (drv->suspend)
453 drv->driver.suspend = platform_drv_suspend;
454 if (drv->resume)
455 drv->driver.resume = platform_drv_resume;
456 return driver_register(&drv->driver);
457}
458EXPORT_SYMBOL_GPL(platform_driver_register);
459
460/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800461 * platform_driver_unregister
462 * @drv: platform driver structure
Russell King00d3dcd2005-11-09 17:23:39 +0000463 */
464void platform_driver_unregister(struct platform_driver *drv)
465{
466 driver_unregister(&drv->driver);
467}
468EXPORT_SYMBOL_GPL(platform_driver_unregister);
469
David Brownellc67334f2006-11-16 23:28:47 -0800470/**
471 * platform_driver_probe - register driver for non-hotpluggable device
472 * @drv: platform driver structure
473 * @probe: the driver probe routine, probably from an __init section
474 *
475 * Use this instead of platform_driver_register() when you know the device
476 * is not hotpluggable and has already been registered, and you want to
477 * remove its run-once probe() infrastructure from memory after the driver
478 * has bound to the device.
479 *
480 * One typical use for this would be with drivers for controllers integrated
481 * into system-on-chip processors, where the controller devices have been
482 * configured as part of board setup.
483 *
484 * Returns zero if the driver registered and bound to a device, else returns
485 * a negative error code and with the driver not registered.
486 */
Andrew Mortonc63e0782006-12-04 14:56:36 -0800487int __init_or_module platform_driver_probe(struct platform_driver *drv,
David Brownellc67334f2006-11-16 23:28:47 -0800488 int (*probe)(struct platform_device *))
489{
490 int retval, code;
491
492 /* temporary section violation during probe() */
493 drv->probe = probe;
494 retval = code = platform_driver_register(drv);
495
496 /* Fixup that section violation, being paranoid about code scanning
497 * the list of drivers in order to probe new devices. Check to see
498 * if the probe was successful, and make sure any forced probes of
499 * new devices fail.
500 */
Greg Kroah-Hartmanc6f7e722007-11-01 19:41:16 -0700501 spin_lock(&platform_bus_type.p->klist_drivers.k_lock);
David Brownellc67334f2006-11-16 23:28:47 -0800502 drv->probe = NULL;
Greg Kroah-Hartmane5dd1272007-11-28 15:59:15 -0800503 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
David Brownellc67334f2006-11-16 23:28:47 -0800504 retval = -ENODEV;
505 drv->driver.probe = platform_drv_probe_fail;
Greg Kroah-Hartmanc6f7e722007-11-01 19:41:16 -0700506 spin_unlock(&platform_bus_type.p->klist_drivers.k_lock);
David Brownellc67334f2006-11-16 23:28:47 -0800507
508 if (code != retval)
509 platform_driver_unregister(drv);
510 return retval;
511}
512EXPORT_SYMBOL_GPL(platform_driver_probe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
David Brownella0245f72006-05-29 10:37:33 -0700514/* modalias support enables more hands-off userspace setup:
515 * (a) environment variable lets new-style hotplug events work once system is
516 * fully running: "modprobe $MODALIAS"
517 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
518 * mishandled before system is fully running: "modprobe $(cat modalias)"
519 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800520static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
521 char *buf)
David Brownella0245f72006-05-29 10:37:33 -0700522{
523 struct platform_device *pdev = to_platform_device(dev);
Kay Sievers43cc71e2007-08-18 04:40:39 +0200524 int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
David Brownella0245f72006-05-29 10:37:33 -0700525
526 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
527}
528
529static struct device_attribute platform_dev_attrs[] = {
530 __ATTR_RO(modalias),
531 __ATTR_NULL,
532};
533
Kay Sievers7eff2e72007-08-14 15:15:12 +0200534static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
David Brownella0245f72006-05-29 10:37:33 -0700535{
536 struct platform_device *pdev = to_platform_device(dev);
537
Kay Sievers7eff2e72007-08-14 15:15:12 +0200538 add_uevent_var(env, "MODALIAS=platform:%s", pdev->name);
David Brownella0245f72006-05-29 10:37:33 -0700539 return 0;
540}
541
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800543 * platform_match - bind platform device to platform driver.
544 * @dev: device.
545 * @drv: driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800547 * Platform device IDs are assumed to be encoded like this:
548 * "<name><instance>", where <name> is a short description of the type of
549 * device, like "pci" or "floppy", and <instance> is the enumerated
550 * instance of the device, like '0' or '42'. Driver IDs are simply
551 * "<name>". So, extract the <name> from the platform_device structure,
552 * and compare it against the name of the driver. Return whether they match
553 * or not.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800555static int platform_match(struct device *dev, struct device_driver *drv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800557 struct platform_device *pdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800559 pdev = container_of(dev, struct platform_device, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 return (strncmp(pdev->name, drv->name, BUS_ID_SIZE) == 0);
561}
562
David Brownell386415d2006-09-03 13:16:45 -0700563static int platform_suspend(struct device *dev, pm_message_t mesg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564{
565 int ret = 0;
566
Russell King9480e302005-10-28 09:52:56 -0700567 if (dev->driver && dev->driver->suspend)
David Brownell386415d2006-09-03 13:16:45 -0700568 ret = dev->driver->suspend(dev, mesg);
569
570 return ret;
571}
572
573static int platform_suspend_late(struct device *dev, pm_message_t mesg)
574{
575 struct platform_driver *drv = to_platform_driver(dev->driver);
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800576 struct platform_device *pdev;
David Brownell386415d2006-09-03 13:16:45 -0700577 int ret = 0;
578
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800579 pdev = container_of(dev, struct platform_device, dev);
David Brownell386415d2006-09-03 13:16:45 -0700580 if (dev->driver && drv->suspend_late)
581 ret = drv->suspend_late(pdev, mesg);
582
583 return ret;
584}
585
586static int platform_resume_early(struct device *dev)
587{
588 struct platform_driver *drv = to_platform_driver(dev->driver);
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800589 struct platform_device *pdev;
David Brownell386415d2006-09-03 13:16:45 -0700590 int ret = 0;
591
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800592 pdev = container_of(dev, struct platform_device, dev);
David Brownell386415d2006-09-03 13:16:45 -0700593 if (dev->driver && drv->resume_early)
594 ret = drv->resume_early(pdev);
Russell King9480e302005-10-28 09:52:56 -0700595
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 return ret;
597}
598
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800599static int platform_resume(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600{
601 int ret = 0;
602
Russell King9480e302005-10-28 09:52:56 -0700603 if (dev->driver && dev->driver->resume)
604 ret = dev->driver->resume(dev);
605
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 return ret;
607}
608
609struct bus_type platform_bus_type = {
610 .name = "platform",
David Brownella0245f72006-05-29 10:37:33 -0700611 .dev_attrs = platform_dev_attrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 .match = platform_match,
David Brownella0245f72006-05-29 10:37:33 -0700613 .uevent = platform_uevent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 .suspend = platform_suspend,
David Brownell386415d2006-09-03 13:16:45 -0700615 .suspend_late = platform_suspend_late,
616 .resume_early = platform_resume_early,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 .resume = platform_resume,
618};
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500619EXPORT_SYMBOL_GPL(platform_bus_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620
621int __init platform_bus_init(void)
622{
Cornelia Huckfbfb1442006-11-27 10:35:08 +0100623 int error;
624
625 error = device_register(&platform_bus);
626 if (error)
627 return error;
628 error = bus_register(&platform_bus_type);
629 if (error)
630 device_unregister(&platform_bus);
631 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632}
633
634#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
635u64 dma_get_required_mask(struct device *dev)
636{
637 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
638 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
639 u64 mask;
640
641 if (!high_totalram) {
642 /* convert to mask just covering totalram */
643 low_totalram = (1 << (fls(low_totalram) - 1));
644 low_totalram += low_totalram - 1;
645 mask = low_totalram;
646 } else {
647 high_totalram = (1 << (fls(high_totalram) - 1));
648 high_totalram += high_totalram - 1;
649 mask = (((u64)high_totalram) << 32) + 0xffffffff;
650 }
James Bottomleye88a0c22008-03-09 11:57:56 -0500651 return mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652}
653EXPORT_SYMBOL_GPL(dma_get_required_mask);
654#endif