blob: 0cad9c7f6bb50f68bdb0a371e44d51530a02ec06 [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
Andrew Mortondaa41222009-08-06 16:00:44 -070013#include <linux/string.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010014#include <linux/platform_device.h>
Grant Likely05212152010-06-08 07:48:20 -060015#include <linux/of_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/dma-mapping.h>
19#include <linux/bootmem.h>
20#include <linux/err.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080021#include <linux/slab.h>
Magnus Damm9d730222009-08-20 20:25:32 +020022#include <linux/pm_runtime.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
Ben Dooksa1bdc7a2005-10-13 17:54:41 +010024#include "base.h"
25
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080026#define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
27 driver))
Russell King00d3dcd2005-11-09 17:23:39 +000028
Linus Torvalds1da177e2005-04-16 15:20:36 -070029struct device platform_bus = {
Kay Sievers1e0b2cf2008-10-30 01:36:48 +010030 .init_name = "platform",
Linus Torvalds1da177e2005-04-16 15:20:36 -070031};
Dmitry Torokhova96b2042005-12-10 01:36:28 -050032EXPORT_SYMBOL_GPL(platform_bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34/**
Kumar Galaa77ce812011-06-10 01:52:57 -050035 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
36 * @dev: platform device
37 *
38 * This is called before platform_device_add() such that any pdev_archdata may
39 * be setup before the platform_notifier is called. So if a user needs to
40 * manipulate any relevant information in the pdev_archdata they can do:
41 *
42 * platform_devic_alloc()
43 * ... manipulate ...
44 * platform_device_add()
45 *
46 * And if they don't care they can just call platform_device_register() and
47 * everything will just work out.
48 */
49void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
50{
51}
52
53/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080054 * platform_get_resource - get a resource for a device
55 * @dev: platform device
56 * @type: resource type
57 * @num: resource index
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080059struct resource *platform_get_resource(struct platform_device *dev,
60 unsigned int type, unsigned int num)
Linus Torvalds1da177e2005-04-16 15:20:36 -070061{
62 int i;
63
64 for (i = 0; i < dev->num_resources; i++) {
65 struct resource *r = &dev->resource[i];
66
Magnus Dammc9f66162008-10-15 22:05:15 -070067 if (type == resource_type(r) && num-- == 0)
68 return r;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 }
70 return NULL;
71}
Dmitry Torokhova96b2042005-12-10 01:36:28 -050072EXPORT_SYMBOL_GPL(platform_get_resource);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080075 * platform_get_irq - get an IRQ for a device
76 * @dev: platform device
77 * @num: IRQ number index
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 */
79int platform_get_irq(struct platform_device *dev, unsigned int num)
80{
81 struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
82
David Vrabel305b3222006-01-19 17:52:27 +000083 return r ? r->start : -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084}
Dmitry Torokhova96b2042005-12-10 01:36:28 -050085EXPORT_SYMBOL_GPL(platform_get_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
87/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080088 * platform_get_resource_byname - get a resource for a device by name
89 * @dev: platform device
90 * @type: resource type
91 * @name: resource name
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080093struct resource *platform_get_resource_byname(struct platform_device *dev,
Linus Walleijc0afe7b2009-04-27 02:38:16 +020094 unsigned int type,
95 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096{
97 int i;
98
99 for (i = 0; i < dev->num_resources; i++) {
100 struct resource *r = &dev->resource[i];
101
Magnus Dammc9f66162008-10-15 22:05:15 -0700102 if (type == resource_type(r) && !strcmp(r->name, name))
103 return r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 }
105 return NULL;
106}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500107EXPORT_SYMBOL_GPL(platform_get_resource_byname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
109/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800110 * platform_get_irq - get an IRQ for a device
111 * @dev: platform device
112 * @name: IRQ name
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 */
Linus Walleijc0afe7b2009-04-27 02:38:16 +0200114int platform_get_irq_byname(struct platform_device *dev, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800116 struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
117 name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
David Vrabel305b3222006-01-19 17:52:27 +0000119 return r ? r->start : -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500121EXPORT_SYMBOL_GPL(platform_get_irq_byname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
123/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800124 * platform_add_devices - add a numbers of platform devices
125 * @devs: array of platform devices to add
126 * @num: number of platform devices in array
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 */
128int platform_add_devices(struct platform_device **devs, int num)
129{
130 int i, ret = 0;
131
132 for (i = 0; i < num; i++) {
133 ret = platform_device_register(devs[i]);
134 if (ret) {
135 while (--i >= 0)
136 platform_device_unregister(devs[i]);
137 break;
138 }
139 }
140
141 return ret;
142}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500143EXPORT_SYMBOL_GPL(platform_add_devices);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
Russell King37c12e72005-11-05 21:19:33 +0000145struct platform_object {
146 struct platform_device pdev;
147 char name[1];
148};
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000151 * platform_device_put - destroy a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800152 * @pdev: platform device to free
Russell King37c12e72005-11-05 21:19:33 +0000153 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800154 * Free all memory associated with a platform device. This function must
155 * _only_ be externally called in error cases. All other usage is a bug.
Russell King37c12e72005-11-05 21:19:33 +0000156 */
157void platform_device_put(struct platform_device *pdev)
158{
159 if (pdev)
160 put_device(&pdev->dev);
161}
162EXPORT_SYMBOL_GPL(platform_device_put);
163
164static void platform_device_release(struct device *dev)
165{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800166 struct platform_object *pa = container_of(dev, struct platform_object,
167 pdev.dev);
Russell King37c12e72005-11-05 21:19:33 +0000168
Grant Likely7096d042010-10-20 11:45:13 -0600169 of_device_node_put(&pa->pdev.dev);
Russell King37c12e72005-11-05 21:19:33 +0000170 kfree(pa->pdev.dev.platform_data);
Samuel Ortize710d7d2011-04-08 00:43:01 +0200171 kfree(pa->pdev.mfd_cell);
Russell King37c12e72005-11-05 21:19:33 +0000172 kfree(pa->pdev.resource);
173 kfree(pa);
174}
175
176/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000177 * platform_device_alloc - create a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800178 * @name: base name of the device we're adding
179 * @id: instance id
Russell King37c12e72005-11-05 21:19:33 +0000180 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800181 * Create a platform device object which can have other objects attached
182 * to it, and which will have attached objects freed when it is released.
Russell King37c12e72005-11-05 21:19:33 +0000183 */
Jean Delvare13595552007-09-09 12:54:16 +0200184struct platform_device *platform_device_alloc(const char *name, int id)
Russell King37c12e72005-11-05 21:19:33 +0000185{
186 struct platform_object *pa;
187
188 pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
189 if (pa) {
190 strcpy(pa->name, name);
191 pa->pdev.name = pa->name;
192 pa->pdev.id = id;
193 device_initialize(&pa->pdev.dev);
194 pa->pdev.dev.release = platform_device_release;
Kumar Galaa77ce812011-06-10 01:52:57 -0500195 arch_setup_pdev_archdata(&pa->pdev);
Russell King37c12e72005-11-05 21:19:33 +0000196 }
197
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500198 return pa ? &pa->pdev : NULL;
Russell King37c12e72005-11-05 21:19:33 +0000199}
200EXPORT_SYMBOL_GPL(platform_device_alloc);
201
202/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000203 * platform_device_add_resources - add resources to a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800204 * @pdev: platform device allocated by platform_device_alloc to add resources to
205 * @res: set of resources that needs to be allocated for the device
206 * @num: number of resources
Russell King37c12e72005-11-05 21:19:33 +0000207 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800208 * Add a copy of the resources to the platform device. The memory
209 * associated with the resources will be freed when the platform device is
210 * released.
Russell King37c12e72005-11-05 21:19:33 +0000211 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800212int platform_device_add_resources(struct platform_device *pdev,
Geert Uytterhoeven0b7f1a72009-01-28 21:01:02 +0100213 const struct resource *res, unsigned int num)
Russell King37c12e72005-11-05 21:19:33 +0000214{
Uwe Kleine-Königcea89622011-04-20 09:44:44 +0200215 struct resource *r = NULL;
Russell King37c12e72005-11-05 21:19:33 +0000216
Uwe Kleine-Königcea89622011-04-20 09:44:44 +0200217 if (res) {
218 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
219 if (!r)
220 return -ENOMEM;
Russell King37c12e72005-11-05 21:19:33 +0000221 }
Uwe Kleine-Königcea89622011-04-20 09:44:44 +0200222
Uwe Kleine-König4a03d6f2011-04-20 09:44:45 +0200223 kfree(pdev->resource);
Uwe Kleine-Königcea89622011-04-20 09:44:44 +0200224 pdev->resource = r;
225 pdev->num_resources = num;
226 return 0;
Russell King37c12e72005-11-05 21:19:33 +0000227}
228EXPORT_SYMBOL_GPL(platform_device_add_resources);
229
230/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000231 * platform_device_add_data - add platform-specific data to a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800232 * @pdev: platform device allocated by platform_device_alloc to add resources to
233 * @data: platform specific data for this platform device
234 * @size: size of platform specific data
Russell King37c12e72005-11-05 21:19:33 +0000235 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800236 * Add a copy of platform specific data to the platform device's
237 * platform_data pointer. The memory associated with the platform data
238 * will be freed when the platform device is released.
Russell King37c12e72005-11-05 21:19:33 +0000239 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800240int platform_device_add_data(struct platform_device *pdev, const void *data,
241 size_t size)
Russell King37c12e72005-11-05 21:19:33 +0000242{
Uwe Kleine-König27a33f92011-04-20 09:44:42 +0200243 void *d = NULL;
Russell King37c12e72005-11-05 21:19:33 +0000244
Uwe Kleine-König27a33f92011-04-20 09:44:42 +0200245 if (data) {
246 d = kmemdup(data, size, GFP_KERNEL);
247 if (!d)
248 return -ENOMEM;
Russell King37c12e72005-11-05 21:19:33 +0000249 }
Uwe Kleine-König27a33f92011-04-20 09:44:42 +0200250
Uwe Kleine-König251e0312011-04-20 09:44:43 +0200251 kfree(pdev->dev.platform_data);
Uwe Kleine-König27a33f92011-04-20 09:44:42 +0200252 pdev->dev.platform_data = d;
253 return 0;
Russell King37c12e72005-11-05 21:19:33 +0000254}
255EXPORT_SYMBOL_GPL(platform_device_add_data);
256
257/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800258 * platform_device_add - add a platform device to device hierarchy
259 * @pdev: platform device we're adding
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800261 * This is part 2 of platform_device_register(), though may be called
262 * separately _iff_ pdev was allocated by platform_device_alloc().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 */
Russell King37c12e72005-11-05 21:19:33 +0000264int platform_device_add(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265{
266 int i, ret = 0;
267
268 if (!pdev)
269 return -EINVAL;
270
271 if (!pdev->dev.parent)
272 pdev->dev.parent = &platform_bus;
273
274 pdev->dev.bus = &platform_bus_type;
275
276 if (pdev->id != -1)
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100277 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 else
Greg Kroah-Hartmanacc0e902009-06-02 15:39:55 -0700279 dev_set_name(&pdev->dev, "%s", pdev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
281 for (i = 0; i < pdev->num_resources; i++) {
282 struct resource *p, *r = &pdev->resource[i];
283
284 if (r->name == NULL)
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100285 r->name = dev_name(&pdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
287 p = r->parent;
288 if (!p) {
Magnus Dammc9f66162008-10-15 22:05:15 -0700289 if (resource_type(r) == IORESOURCE_MEM)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 p = &iomem_resource;
Magnus Dammc9f66162008-10-15 22:05:15 -0700291 else if (resource_type(r) == IORESOURCE_IO)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 p = &ioport_resource;
293 }
294
Kumar Galad960bb42005-11-28 10:15:39 -0600295 if (p && insert_resource(p, r)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 printk(KERN_ERR
297 "%s: failed to claim resource %d\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100298 dev_name(&pdev->dev), i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 ret = -EBUSY;
300 goto failed;
301 }
302 }
303
304 pr_debug("Registering platform device '%s'. Parent at %s\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100305 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Russell Kinge3915532006-05-06 08:15:26 +0100307 ret = device_add(&pdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 if (ret == 0)
309 return ret;
310
311 failed:
Magnus Dammc9f66162008-10-15 22:05:15 -0700312 while (--i >= 0) {
313 struct resource *r = &pdev->resource[i];
314 unsigned long type = resource_type(r);
315
316 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
317 release_resource(r);
318 }
319
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 return ret;
321}
Russell King37c12e72005-11-05 21:19:33 +0000322EXPORT_SYMBOL_GPL(platform_device_add);
323
324/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800325 * platform_device_del - remove a platform-level device
326 * @pdev: platform device we're removing
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500327 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800328 * Note that this function will also release all memory- and port-based
329 * resources owned by the device (@dev->resource). This function must
330 * _only_ be externally called in error cases. All other usage is a bug.
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500331 */
332void platform_device_del(struct platform_device *pdev)
333{
334 int i;
335
336 if (pdev) {
Jean Delvaredc4c15d2007-05-02 20:55:54 +0200337 device_del(&pdev->dev);
338
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500339 for (i = 0; i < pdev->num_resources; i++) {
340 struct resource *r = &pdev->resource[i];
Magnus Dammc9f66162008-10-15 22:05:15 -0700341 unsigned long type = resource_type(r);
342
343 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500344 release_resource(r);
345 }
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500346 }
347}
348EXPORT_SYMBOL_GPL(platform_device_del);
349
350/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800351 * platform_device_register - add a platform-level device
352 * @pdev: platform device we're adding
Russell King37c12e72005-11-05 21:19:33 +0000353 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800354int platform_device_register(struct platform_device *pdev)
Russell King37c12e72005-11-05 21:19:33 +0000355{
356 device_initialize(&pdev->dev);
Kumar Galaa77ce812011-06-10 01:52:57 -0500357 arch_setup_pdev_archdata(pdev);
Russell King37c12e72005-11-05 21:19:33 +0000358 return platform_device_add(pdev);
359}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500360EXPORT_SYMBOL_GPL(platform_device_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
362/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800363 * platform_device_unregister - unregister a platform-level device
364 * @pdev: platform device we're unregistering
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800366 * Unregistration is done in 2 steps. First we release all resources
367 * and remove it from the subsystem, then we drop reference count by
368 * calling platform_device_put().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800370void platform_device_unregister(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371{
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500372 platform_device_del(pdev);
373 platform_device_put(pdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500375EXPORT_SYMBOL_GPL(platform_device_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377/**
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200378 * platform_device_register_resndata - add a platform-level device with
379 * resources and platform-specific data
380 *
381 * @parent: parent device for the device we're adding
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800382 * @name: base name of the device we're adding
383 * @id: instance id
384 * @res: set of resources that needs to be allocated for the device
385 * @num: number of resources
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700386 * @data: platform specific data for this platform device
387 * @size: size of platform specific data
388 *
Jani Nikulaf0eae0e2010-03-11 18:11:45 +0200389 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700390 */
Andrew Mortonbb2b43f2011-05-23 14:44:19 -0700391struct platform_device *platform_device_register_resndata(
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700392 struct device *parent,
393 const char *name, int id,
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200394 const struct resource *res, unsigned int num,
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700395 const void *data, size_t size)
396{
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200397 int ret = -ENOMEM;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700398 struct platform_device *pdev;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700399
400 pdev = platform_device_alloc(name, id);
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200401 if (!pdev)
402 goto err;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700403
404 pdev->dev.parent = parent;
405
Anton Vorontsov807508c2010-09-07 17:31:54 +0400406 ret = platform_device_add_resources(pdev, res, num);
407 if (ret)
408 goto err;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700409
Anton Vorontsov807508c2010-09-07 17:31:54 +0400410 ret = platform_device_add_data(pdev, data, size);
411 if (ret)
412 goto err;
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200413
414 ret = platform_device_add(pdev);
415 if (ret) {
416err:
417 platform_device_put(pdev);
418 return ERR_PTR(ret);
419 }
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700420
421 return pdev;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700422}
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200423EXPORT_SYMBOL_GPL(platform_device_register_resndata);
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700424
Russell King00d3dcd2005-11-09 17:23:39 +0000425static int platform_drv_probe(struct device *_dev)
426{
427 struct platform_driver *drv = to_platform_driver(_dev->driver);
428 struct platform_device *dev = to_platform_device(_dev);
429
430 return drv->probe(dev);
431}
432
David Brownellc67334f2006-11-16 23:28:47 -0800433static int platform_drv_probe_fail(struct device *_dev)
434{
435 return -ENXIO;
436}
437
Russell King00d3dcd2005-11-09 17:23:39 +0000438static int platform_drv_remove(struct device *_dev)
439{
440 struct platform_driver *drv = to_platform_driver(_dev->driver);
441 struct platform_device *dev = to_platform_device(_dev);
442
443 return drv->remove(dev);
444}
445
446static void platform_drv_shutdown(struct device *_dev)
447{
448 struct platform_driver *drv = to_platform_driver(_dev->driver);
449 struct platform_device *dev = to_platform_device(_dev);
450
451 drv->shutdown(dev);
452}
453
Russell King00d3dcd2005-11-09 17:23:39 +0000454/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000455 * platform_driver_register - register a driver for platform-level devices
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800456 * @drv: platform driver structure
Russell King00d3dcd2005-11-09 17:23:39 +0000457 */
458int platform_driver_register(struct platform_driver *drv)
459{
460 drv->driver.bus = &platform_bus_type;
461 if (drv->probe)
462 drv->driver.probe = platform_drv_probe;
463 if (drv->remove)
464 drv->driver.remove = platform_drv_remove;
465 if (drv->shutdown)
466 drv->driver.shutdown = platform_drv_shutdown;
Magnus Damm783ea7d2009-06-04 22:13:33 +0200467
Russell King00d3dcd2005-11-09 17:23:39 +0000468 return driver_register(&drv->driver);
469}
470EXPORT_SYMBOL_GPL(platform_driver_register);
471
472/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000473 * platform_driver_unregister - unregister a driver for platform-level devices
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800474 * @drv: platform driver structure
Russell King00d3dcd2005-11-09 17:23:39 +0000475 */
476void platform_driver_unregister(struct platform_driver *drv)
477{
478 driver_unregister(&drv->driver);
479}
480EXPORT_SYMBOL_GPL(platform_driver_unregister);
481
David Brownellc67334f2006-11-16 23:28:47 -0800482/**
483 * platform_driver_probe - register driver for non-hotpluggable device
484 * @drv: platform driver structure
485 * @probe: the driver probe routine, probably from an __init section
486 *
487 * Use this instead of platform_driver_register() when you know the device
488 * is not hotpluggable and has already been registered, and you want to
489 * remove its run-once probe() infrastructure from memory after the driver
490 * has bound to the device.
491 *
492 * One typical use for this would be with drivers for controllers integrated
493 * into system-on-chip processors, where the controller devices have been
494 * configured as part of board setup.
495 *
496 * Returns zero if the driver registered and bound to a device, else returns
497 * a negative error code and with the driver not registered.
498 */
Andrew Mortonc63e0782006-12-04 14:56:36 -0800499int __init_or_module platform_driver_probe(struct platform_driver *drv,
David Brownellc67334f2006-11-16 23:28:47 -0800500 int (*probe)(struct platform_device *))
501{
502 int retval, code;
503
Dmitry Torokhov1a6f2a72009-10-12 20:17:41 -0700504 /* make sure driver won't have bind/unbind attributes */
505 drv->driver.suppress_bind_attrs = true;
506
David Brownellc67334f2006-11-16 23:28:47 -0800507 /* temporary section violation during probe() */
508 drv->probe = probe;
509 retval = code = platform_driver_register(drv);
510
Dmitry Torokhov1a6f2a72009-10-12 20:17:41 -0700511 /*
512 * Fixup that section violation, being paranoid about code scanning
David Brownellc67334f2006-11-16 23:28:47 -0800513 * the list of drivers in order to probe new devices. Check to see
514 * if the probe was successful, and make sure any forced probes of
515 * new devices fail.
516 */
Patrick Pannutod79d3242010-08-06 17:12:41 -0700517 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
David Brownellc67334f2006-11-16 23:28:47 -0800518 drv->probe = NULL;
Greg Kroah-Hartmane5dd1272007-11-28 15:59:15 -0800519 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
David Brownellc67334f2006-11-16 23:28:47 -0800520 retval = -ENODEV;
521 drv->driver.probe = platform_drv_probe_fail;
Patrick Pannutod79d3242010-08-06 17:12:41 -0700522 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
David Brownellc67334f2006-11-16 23:28:47 -0800523
524 if (code != retval)
525 platform_driver_unregister(drv);
526 return retval;
527}
528EXPORT_SYMBOL_GPL(platform_driver_probe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800530/**
531 * platform_create_bundle - register driver and create corresponding device
532 * @driver: platform driver structure
533 * @probe: the driver probe routine, probably from an __init section
534 * @res: set of resources that needs to be allocated for the device
535 * @n_res: number of resources
536 * @data: platform specific data for this platform device
537 * @size: size of platform specific data
538 *
539 * Use this in legacy-style modules that probe hardware directly and
540 * register a single platform device and corresponding platform driver.
Jani Nikulaf0eae0e2010-03-11 18:11:45 +0200541 *
542 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800543 */
544struct platform_device * __init_or_module platform_create_bundle(
545 struct platform_driver *driver,
546 int (*probe)(struct platform_device *),
547 struct resource *res, unsigned int n_res,
548 const void *data, size_t size)
549{
550 struct platform_device *pdev;
551 int error;
552
553 pdev = platform_device_alloc(driver->driver.name, -1);
554 if (!pdev) {
555 error = -ENOMEM;
556 goto err_out;
557 }
558
Anton Vorontsov807508c2010-09-07 17:31:54 +0400559 error = platform_device_add_resources(pdev, res, n_res);
560 if (error)
561 goto err_pdev_put;
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800562
Anton Vorontsov807508c2010-09-07 17:31:54 +0400563 error = platform_device_add_data(pdev, data, size);
564 if (error)
565 goto err_pdev_put;
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800566
567 error = platform_device_add(pdev);
568 if (error)
569 goto err_pdev_put;
570
571 error = platform_driver_probe(driver, probe);
572 if (error)
573 goto err_pdev_del;
574
575 return pdev;
576
577err_pdev_del:
578 platform_device_del(pdev);
579err_pdev_put:
580 platform_device_put(pdev);
581err_out:
582 return ERR_PTR(error);
583}
584EXPORT_SYMBOL_GPL(platform_create_bundle);
585
David Brownella0245f72006-05-29 10:37:33 -0700586/* modalias support enables more hands-off userspace setup:
587 * (a) environment variable lets new-style hotplug events work once system is
588 * fully running: "modprobe $MODALIAS"
589 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
590 * mishandled before system is fully running: "modprobe $(cat modalias)"
591 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800592static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
593 char *buf)
David Brownella0245f72006-05-29 10:37:33 -0700594{
595 struct platform_device *pdev = to_platform_device(dev);
Kay Sievers43cc71e2007-08-18 04:40:39 +0200596 int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
David Brownella0245f72006-05-29 10:37:33 -0700597
598 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
599}
600
601static struct device_attribute platform_dev_attrs[] = {
602 __ATTR_RO(modalias),
603 __ATTR_NULL,
604};
605
Kay Sievers7eff2e72007-08-14 15:15:12 +0200606static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
David Brownella0245f72006-05-29 10:37:33 -0700607{
608 struct platform_device *pdev = to_platform_device(dev);
Grant Likelyeca39302010-06-08 07:48:21 -0600609 int rc;
610
611 /* Some devices have extra OF data and an OF-style MODALIAS */
612 rc = of_device_uevent(dev,env);
613 if (rc != -ENODEV)
614 return rc;
David Brownella0245f72006-05-29 10:37:33 -0700615
Eric Miao57fee4a2009-02-04 11:52:40 +0800616 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
617 (pdev->id_entry) ? pdev->id_entry->name : pdev->name);
David Brownella0245f72006-05-29 10:37:33 -0700618 return 0;
619}
620
Eric Miao57fee4a2009-02-04 11:52:40 +0800621static const struct platform_device_id *platform_match_id(
Uwe Kleine-König831fad22010-01-26 09:35:00 +0100622 const struct platform_device_id *id,
Eric Miao57fee4a2009-02-04 11:52:40 +0800623 struct platform_device *pdev)
624{
625 while (id->name[0]) {
626 if (strcmp(pdev->name, id->name) == 0) {
627 pdev->id_entry = id;
628 return id;
629 }
630 id++;
631 }
632 return NULL;
633}
634
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800636 * platform_match - bind platform device to platform driver.
637 * @dev: device.
638 * @drv: driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800640 * Platform device IDs are assumed to be encoded like this:
641 * "<name><instance>", where <name> is a short description of the type of
642 * device, like "pci" or "floppy", and <instance> is the enumerated
643 * instance of the device, like '0' or '42'. Driver IDs are simply
644 * "<name>". So, extract the <name> from the platform_device structure,
645 * and compare it against the name of the driver. Return whether they match
646 * or not.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800648static int platform_match(struct device *dev, struct device_driver *drv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649{
Eric Miao71b3e0c2009-01-31 22:47:44 +0800650 struct platform_device *pdev = to_platform_device(dev);
Eric Miao57fee4a2009-02-04 11:52:40 +0800651 struct platform_driver *pdrv = to_platform_driver(drv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
Grant Likely05212152010-06-08 07:48:20 -0600653 /* Attempt an OF style match first */
654 if (of_driver_match_device(dev, drv))
655 return 1;
656
657 /* Then try to match against the id table */
Eric Miao57fee4a2009-02-04 11:52:40 +0800658 if (pdrv->id_table)
659 return platform_match_id(pdrv->id_table, pdev) != NULL;
660
661 /* fall-back to driver name match */
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100662 return (strcmp(pdev->name, drv->name) == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663}
664
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200665#ifdef CONFIG_PM_SLEEP
666
667static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668{
Magnus Damm783ea7d2009-06-04 22:13:33 +0200669 struct platform_driver *pdrv = to_platform_driver(dev->driver);
670 struct platform_device *pdev = to_platform_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 int ret = 0;
672
Magnus Damm783ea7d2009-06-04 22:13:33 +0200673 if (dev->driver && pdrv->suspend)
674 ret = pdrv->suspend(pdev, mesg);
David Brownell386415d2006-09-03 13:16:45 -0700675
676 return ret;
677}
678
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200679static int platform_legacy_resume(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680{
Magnus Damm783ea7d2009-06-04 22:13:33 +0200681 struct platform_driver *pdrv = to_platform_driver(dev->driver);
682 struct platform_device *pdev = to_platform_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 int ret = 0;
684
Magnus Damm783ea7d2009-06-04 22:13:33 +0200685 if (dev->driver && pdrv->resume)
686 ret = pdrv->resume(pdev);
Russell King9480e302005-10-28 09:52:56 -0700687
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 return ret;
689}
690
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200691int platform_pm_prepare(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200692{
693 struct device_driver *drv = dev->driver;
694 int ret = 0;
695
696 if (drv && drv->pm && drv->pm->prepare)
697 ret = drv->pm->prepare(dev);
698
699 return ret;
700}
701
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200702void platform_pm_complete(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200703{
704 struct device_driver *drv = dev->driver;
705
706 if (drv && drv->pm && drv->pm->complete)
707 drv->pm->complete(dev);
708}
709
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200710#endif /* CONFIG_PM_SLEEP */
Magnus Damm9d730222009-08-20 20:25:32 +0200711
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200712#ifdef CONFIG_SUSPEND
713
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200714int platform_pm_suspend(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200715{
716 struct device_driver *drv = dev->driver;
717 int ret = 0;
718
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200719 if (!drv)
720 return 0;
721
722 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200723 if (drv->pm->suspend)
724 ret = drv->pm->suspend(dev);
725 } else {
726 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
727 }
728
729 return ret;
730}
731
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200732int platform_pm_suspend_noirq(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200733{
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200734 struct device_driver *drv = dev->driver;
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200735 int ret = 0;
736
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200737 if (!drv)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200738 return 0;
739
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200740 if (drv->pm) {
741 if (drv->pm->suspend_noirq)
742 ret = drv->pm->suspend_noirq(dev);
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200743 }
744
745 return ret;
746}
747
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200748int platform_pm_resume(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200749{
750 struct device_driver *drv = dev->driver;
751 int ret = 0;
752
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200753 if (!drv)
754 return 0;
755
756 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200757 if (drv->pm->resume)
758 ret = drv->pm->resume(dev);
759 } else {
760 ret = platform_legacy_resume(dev);
761 }
762
763 return ret;
764}
765
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200766int platform_pm_resume_noirq(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200767{
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200768 struct device_driver *drv = dev->driver;
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200769 int ret = 0;
770
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200771 if (!drv)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200772 return 0;
773
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200774 if (drv->pm) {
775 if (drv->pm->resume_noirq)
776 ret = drv->pm->resume_noirq(dev);
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200777 }
778
779 return ret;
780}
781
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200782#endif /* CONFIG_SUSPEND */
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200783
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +0200784#ifdef CONFIG_HIBERNATE_CALLBACKS
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200785
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200786int platform_pm_freeze(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200787{
788 struct device_driver *drv = dev->driver;
789 int ret = 0;
790
791 if (!drv)
792 return 0;
793
794 if (drv->pm) {
795 if (drv->pm->freeze)
796 ret = drv->pm->freeze(dev);
797 } else {
798 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
799 }
800
801 return ret;
802}
803
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200804int platform_pm_freeze_noirq(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200805{
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200806 struct device_driver *drv = dev->driver;
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200807 int ret = 0;
808
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200809 if (!drv)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200810 return 0;
811
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200812 if (drv->pm) {
813 if (drv->pm->freeze_noirq)
814 ret = drv->pm->freeze_noirq(dev);
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200815 }
816
817 return ret;
818}
819
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200820int platform_pm_thaw(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200821{
822 struct device_driver *drv = dev->driver;
823 int ret = 0;
824
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200825 if (!drv)
826 return 0;
827
828 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200829 if (drv->pm->thaw)
830 ret = drv->pm->thaw(dev);
831 } else {
832 ret = platform_legacy_resume(dev);
833 }
834
835 return ret;
836}
837
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200838int platform_pm_thaw_noirq(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200839{
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200840 struct device_driver *drv = dev->driver;
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200841 int ret = 0;
842
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200843 if (!drv)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200844 return 0;
845
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200846 if (drv->pm) {
847 if (drv->pm->thaw_noirq)
848 ret = drv->pm->thaw_noirq(dev);
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200849 }
850
851 return ret;
852}
853
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200854int platform_pm_poweroff(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200855{
856 struct device_driver *drv = dev->driver;
857 int ret = 0;
858
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200859 if (!drv)
860 return 0;
861
862 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200863 if (drv->pm->poweroff)
864 ret = drv->pm->poweroff(dev);
865 } else {
866 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
867 }
868
869 return ret;
870}
871
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200872int platform_pm_poweroff_noirq(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200873{
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200874 struct device_driver *drv = dev->driver;
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200875 int ret = 0;
876
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200877 if (!drv)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200878 return 0;
879
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200880 if (drv->pm) {
881 if (drv->pm->poweroff_noirq)
882 ret = drv->pm->poweroff_noirq(dev);
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200883 }
884
885 return ret;
886}
887
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200888int platform_pm_restore(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200889{
890 struct device_driver *drv = dev->driver;
891 int ret = 0;
892
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200893 if (!drv)
894 return 0;
895
896 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200897 if (drv->pm->restore)
898 ret = drv->pm->restore(dev);
899 } else {
900 ret = platform_legacy_resume(dev);
901 }
902
903 return ret;
904}
905
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200906int platform_pm_restore_noirq(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200907{
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200908 struct device_driver *drv = dev->driver;
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200909 int ret = 0;
910
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200911 if (!drv)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200912 return 0;
913
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200914 if (drv->pm) {
915 if (drv->pm->restore_noirq)
916 ret = drv->pm->restore_noirq(dev);
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200917 }
918
919 return ret;
920}
921
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200922#endif /* CONFIG_HIBERNATE_CALLBACKS */
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200923
Dmitry Torokhovd9ab7712009-07-22 00:37:25 +0200924static const struct dev_pm_ops platform_dev_pm_ops = {
Rafael J. Wysocki8b313a32011-04-29 00:36:32 +0200925 .runtime_suspend = pm_generic_runtime_suspend,
926 .runtime_resume = pm_generic_runtime_resume,
927 .runtime_idle = pm_generic_runtime_idle,
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200928 USE_PLATFORM_PM_SLEEP_OPS
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200929};
930
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931struct bus_type platform_bus_type = {
932 .name = "platform",
David Brownella0245f72006-05-29 10:37:33 -0700933 .dev_attrs = platform_dev_attrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 .match = platform_match,
David Brownella0245f72006-05-29 10:37:33 -0700935 .uevent = platform_uevent,
Magnus Damm9d730222009-08-20 20:25:32 +0200936 .pm = &platform_dev_pm_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937};
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500938EXPORT_SYMBOL_GPL(platform_bus_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939
940int __init platform_bus_init(void)
941{
Cornelia Huckfbfb1442006-11-27 10:35:08 +0100942 int error;
943
Magnus Damm13977092009-03-30 14:37:25 -0700944 early_platform_cleanup();
945
Cornelia Huckfbfb1442006-11-27 10:35:08 +0100946 error = device_register(&platform_bus);
947 if (error)
948 return error;
949 error = bus_register(&platform_bus_type);
950 if (error)
951 device_unregister(&platform_bus);
952 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953}
954
955#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
956u64 dma_get_required_mask(struct device *dev)
957{
958 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
959 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
960 u64 mask;
961
962 if (!high_totalram) {
963 /* convert to mask just covering totalram */
964 low_totalram = (1 << (fls(low_totalram) - 1));
965 low_totalram += low_totalram - 1;
966 mask = low_totalram;
967 } else {
968 high_totalram = (1 << (fls(high_totalram) - 1));
969 high_totalram += high_totalram - 1;
970 mask = (((u64)high_totalram) << 32) + 0xffffffff;
971 }
James Bottomleye88a0c22008-03-09 11:57:56 -0500972 return mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973}
974EXPORT_SYMBOL_GPL(dma_get_required_mask);
975#endif
Magnus Damm13977092009-03-30 14:37:25 -0700976
977static __initdata LIST_HEAD(early_platform_driver_list);
978static __initdata LIST_HEAD(early_platform_device_list);
979
980/**
Magnus Damm4d26e1392010-03-10 20:50:38 +0900981 * early_platform_driver_register - register early platform driver
Randy Dunlapd86c1302009-04-21 07:22:53 -0700982 * @epdrv: early_platform driver structure
Magnus Damm13977092009-03-30 14:37:25 -0700983 * @buf: string passed from early_param()
Magnus Damm4d26e1392010-03-10 20:50:38 +0900984 *
985 * Helper function for early_platform_init() / early_platform_init_buffer()
Magnus Damm13977092009-03-30 14:37:25 -0700986 */
987int __init early_platform_driver_register(struct early_platform_driver *epdrv,
988 char *buf)
989{
Magnus Dammc60e0502009-11-27 17:38:51 +0900990 char *tmp;
Magnus Damm13977092009-03-30 14:37:25 -0700991 int n;
992
993 /* Simply add the driver to the end of the global list.
994 * Drivers will by default be put on the list in compiled-in order.
995 */
996 if (!epdrv->list.next) {
997 INIT_LIST_HEAD(&epdrv->list);
998 list_add_tail(&epdrv->list, &early_platform_driver_list);
999 }
1000
1001 /* If the user has specified device then make sure the driver
1002 * gets prioritized. The driver of the last device specified on
1003 * command line will be put first on the list.
1004 */
1005 n = strlen(epdrv->pdrv->driver.name);
1006 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1007 list_move(&epdrv->list, &early_platform_driver_list);
1008
Magnus Dammc60e0502009-11-27 17:38:51 +09001009 /* Allow passing parameters after device name */
1010 if (buf[n] == '\0' || buf[n] == ',')
Magnus Damm13977092009-03-30 14:37:25 -07001011 epdrv->requested_id = -1;
Magnus Dammc60e0502009-11-27 17:38:51 +09001012 else {
1013 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1014 &tmp, 10);
1015
1016 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1017 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1018 n = 0;
1019 } else
1020 n += strcspn(&buf[n + 1], ",") + 1;
1021 }
1022
1023 if (buf[n] == ',')
1024 n++;
1025
1026 if (epdrv->bufsize) {
1027 memcpy(epdrv->buffer, &buf[n],
1028 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1029 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1030 }
Magnus Damm13977092009-03-30 14:37:25 -07001031 }
1032
1033 return 0;
1034}
1035
1036/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001037 * early_platform_add_devices - adds a number of early platform devices
Magnus Damm13977092009-03-30 14:37:25 -07001038 * @devs: array of early platform devices to add
1039 * @num: number of early platform devices in array
Magnus Damm4d26e1392010-03-10 20:50:38 +09001040 *
1041 * Used by early architecture code to register early platform devices and
1042 * their platform data.
Magnus Damm13977092009-03-30 14:37:25 -07001043 */
1044void __init early_platform_add_devices(struct platform_device **devs, int num)
1045{
1046 struct device *dev;
1047 int i;
1048
1049 /* simply add the devices to list */
1050 for (i = 0; i < num; i++) {
1051 dev = &devs[i]->dev;
1052
1053 if (!dev->devres_head.next) {
1054 INIT_LIST_HEAD(&dev->devres_head);
1055 list_add_tail(&dev->devres_head,
1056 &early_platform_device_list);
1057 }
1058 }
1059}
1060
1061/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001062 * early_platform_driver_register_all - register early platform drivers
Magnus Damm13977092009-03-30 14:37:25 -07001063 * @class_str: string to identify early platform driver class
Magnus Damm4d26e1392010-03-10 20:50:38 +09001064 *
1065 * Used by architecture code to register all early platform drivers
1066 * for a certain class. If omitted then only early platform drivers
1067 * with matching kernel command line class parameters will be registered.
Magnus Damm13977092009-03-30 14:37:25 -07001068 */
1069void __init early_platform_driver_register_all(char *class_str)
1070{
1071 /* The "class_str" parameter may or may not be present on the kernel
1072 * command line. If it is present then there may be more than one
1073 * matching parameter.
1074 *
1075 * Since we register our early platform drivers using early_param()
1076 * we need to make sure that they also get registered in the case
1077 * when the parameter is missing from the kernel command line.
1078 *
1079 * We use parse_early_options() to make sure the early_param() gets
1080 * called at least once. The early_param() may be called more than
1081 * once since the name of the preferred device may be specified on
1082 * the kernel command line. early_platform_driver_register() handles
1083 * this case for us.
1084 */
1085 parse_early_options(class_str);
1086}
1087
1088/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001089 * early_platform_match - find early platform device matching driver
Randy Dunlapd86c1302009-04-21 07:22:53 -07001090 * @epdrv: early platform driver structure
Magnus Damm13977092009-03-30 14:37:25 -07001091 * @id: id to match against
1092 */
1093static __init struct platform_device *
1094early_platform_match(struct early_platform_driver *epdrv, int id)
1095{
1096 struct platform_device *pd;
1097
1098 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1099 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1100 if (pd->id == id)
1101 return pd;
1102
1103 return NULL;
1104}
1105
1106/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001107 * early_platform_left - check if early platform driver has matching devices
Randy Dunlapd86c1302009-04-21 07:22:53 -07001108 * @epdrv: early platform driver structure
Magnus Damm13977092009-03-30 14:37:25 -07001109 * @id: return true if id or above exists
1110 */
1111static __init int early_platform_left(struct early_platform_driver *epdrv,
1112 int id)
1113{
1114 struct platform_device *pd;
1115
1116 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1117 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1118 if (pd->id >= id)
1119 return 1;
1120
1121 return 0;
1122}
1123
1124/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001125 * early_platform_driver_probe_id - probe drivers matching class_str and id
Magnus Damm13977092009-03-30 14:37:25 -07001126 * @class_str: string to identify early platform driver class
1127 * @id: id to match against
1128 * @nr_probe: number of platform devices to successfully probe before exiting
1129 */
1130static int __init early_platform_driver_probe_id(char *class_str,
1131 int id,
1132 int nr_probe)
1133{
1134 struct early_platform_driver *epdrv;
1135 struct platform_device *match;
1136 int match_id;
1137 int n = 0;
1138 int left = 0;
1139
1140 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1141 /* only use drivers matching our class_str */
1142 if (strcmp(class_str, epdrv->class_str))
1143 continue;
1144
1145 if (id == -2) {
1146 match_id = epdrv->requested_id;
1147 left = 1;
1148
1149 } else {
1150 match_id = id;
1151 left += early_platform_left(epdrv, id);
1152
1153 /* skip requested id */
1154 switch (epdrv->requested_id) {
1155 case EARLY_PLATFORM_ID_ERROR:
1156 case EARLY_PLATFORM_ID_UNSET:
1157 break;
1158 default:
1159 if (epdrv->requested_id == id)
1160 match_id = EARLY_PLATFORM_ID_UNSET;
1161 }
1162 }
1163
1164 switch (match_id) {
1165 case EARLY_PLATFORM_ID_ERROR:
1166 pr_warning("%s: unable to parse %s parameter\n",
1167 class_str, epdrv->pdrv->driver.name);
1168 /* fall-through */
1169 case EARLY_PLATFORM_ID_UNSET:
1170 match = NULL;
1171 break;
1172 default:
1173 match = early_platform_match(epdrv, match_id);
1174 }
1175
1176 if (match) {
Paul Mundta636ee72010-03-09 06:57:53 +00001177 /*
1178 * Set up a sensible init_name to enable
1179 * dev_name() and others to be used before the
1180 * rest of the driver core is initialized.
1181 */
Paul Mundt06fe53b2010-05-13 17:56:56 +09001182 if (!match->dev.init_name && slab_is_available()) {
Paul Mundta636ee72010-03-09 06:57:53 +00001183 if (match->id != -1)
Paul Mundtbd050862010-03-29 15:51:35 +09001184 match->dev.init_name =
1185 kasprintf(GFP_KERNEL, "%s.%d",
1186 match->name,
1187 match->id);
Paul Mundta636ee72010-03-09 06:57:53 +00001188 else
Paul Mundtbd050862010-03-29 15:51:35 +09001189 match->dev.init_name =
1190 kasprintf(GFP_KERNEL, "%s",
1191 match->name);
Paul Mundta636ee72010-03-09 06:57:53 +00001192
Paul Mundta636ee72010-03-09 06:57:53 +00001193 if (!match->dev.init_name)
1194 return -ENOMEM;
1195 }
Paul Mundtbd050862010-03-29 15:51:35 +09001196
Magnus Damm13977092009-03-30 14:37:25 -07001197 if (epdrv->pdrv->probe(match))
1198 pr_warning("%s: unable to probe %s early.\n",
1199 class_str, match->name);
1200 else
1201 n++;
1202 }
1203
1204 if (n >= nr_probe)
1205 break;
1206 }
1207
1208 if (left)
1209 return n;
1210 else
1211 return -ENODEV;
1212}
1213
1214/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001215 * early_platform_driver_probe - probe a class of registered drivers
Magnus Damm13977092009-03-30 14:37:25 -07001216 * @class_str: string to identify early platform driver class
1217 * @nr_probe: number of platform devices to successfully probe before exiting
1218 * @user_only: only probe user specified early platform devices
Magnus Damm4d26e1392010-03-10 20:50:38 +09001219 *
1220 * Used by architecture code to probe registered early platform drivers
1221 * within a certain class. For probe to happen a registered early platform
1222 * device matching a registered early platform driver is needed.
Magnus Damm13977092009-03-30 14:37:25 -07001223 */
1224int __init early_platform_driver_probe(char *class_str,
1225 int nr_probe,
1226 int user_only)
1227{
1228 int k, n, i;
1229
1230 n = 0;
1231 for (i = -2; n < nr_probe; i++) {
1232 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1233
1234 if (k < 0)
1235 break;
1236
1237 n += k;
1238
1239 if (user_only)
1240 break;
1241 }
1242
1243 return n;
1244}
1245
1246/**
1247 * early_platform_cleanup - clean up early platform code
1248 */
1249void __init early_platform_cleanup(void)
1250{
1251 struct platform_device *pd, *pd2;
1252
1253 /* clean up the devres list used to chain devices */
1254 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1255 dev.devres_head) {
1256 list_del(&pd->dev.devres_head);
1257 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));
1258 }
1259}
1260