blob: 3c3197a8de41699dcde5164ba7a11ffff870304f [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>
Jean Delvare689ae232012-07-27 22:14:59 +020023#include <linux/idr.h>
Mika Westerberg91e56872012-10-31 22:45:02 +010024#include <linux/acpi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Ben Dooksa1bdc7a2005-10-13 17:54:41 +010026#include "base.h"
Rafael J. Wysockibed2b422012-08-06 01:45:11 +020027#include "power/power.h"
Ben Dooksa1bdc7a2005-10-13 17:54:41 +010028
Jean Delvare689ae232012-07-27 22:14:59 +020029/* For automatically allocated device IDs */
30static DEFINE_IDA(platform_devid_ida);
31
Linus Torvalds1da177e2005-04-16 15:20:36 -070032struct device platform_bus = {
Kay Sievers1e0b2cf2008-10-30 01:36:48 +010033 .init_name = "platform",
Linus Torvalds1da177e2005-04-16 15:20:36 -070034};
Dmitry Torokhova96b2042005-12-10 01:36:28 -050035EXPORT_SYMBOL_GPL(platform_bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37/**
Kumar Galaa77ce812011-06-10 01:52:57 -050038 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
Randy Dunlap7de636f2011-07-27 12:11:25 -070039 * @pdev: platform device
Kumar Galaa77ce812011-06-10 01:52:57 -050040 *
41 * This is called before platform_device_add() such that any pdev_archdata may
42 * be setup before the platform_notifier is called. So if a user needs to
43 * manipulate any relevant information in the pdev_archdata they can do:
44 *
Sebastian Andrzej Siewiorb1d6d822012-10-29 18:04:53 +010045 * platform_device_alloc()
Fabio Porcedda0258e182013-03-26 10:35:16 +010046 * ... manipulate ...
47 * platform_device_add()
Kumar Galaa77ce812011-06-10 01:52:57 -050048 *
49 * And if they don't care they can just call platform_device_register() and
50 * everything will just work out.
51 */
52void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
53{
54}
55
56/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080057 * platform_get_resource - get a resource for a device
58 * @dev: platform device
59 * @type: resource type
60 * @num: resource index
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080062struct resource *platform_get_resource(struct platform_device *dev,
63 unsigned int type, unsigned int num)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
65 int i;
66
67 for (i = 0; i < dev->num_resources; i++) {
68 struct resource *r = &dev->resource[i];
69
Magnus Dammc9f66162008-10-15 22:05:15 -070070 if (type == resource_type(r) && num-- == 0)
71 return r;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 }
73 return NULL;
74}
Dmitry Torokhova96b2042005-12-10 01:36:28 -050075EXPORT_SYMBOL_GPL(platform_get_resource);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
77/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080078 * platform_get_irq - get an IRQ for a device
79 * @dev: platform device
80 * @num: IRQ number index
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 */
82int platform_get_irq(struct platform_device *dev, unsigned int num)
83{
Andreas Larsson5cf8f7d2012-10-29 23:26:56 +000084#ifdef CONFIG_SPARC
85 /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
86 if (!dev || num >= dev->archdata.num_irqs)
87 return -ENXIO;
88 return dev->archdata.irqs[num];
89#else
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
91
David Vrabel305b3222006-01-19 17:52:27 +000092 return r ? r->start : -ENXIO;
Andreas Larsson5cf8f7d2012-10-29 23:26:56 +000093#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070094}
Dmitry Torokhova96b2042005-12-10 01:36:28 -050095EXPORT_SYMBOL_GPL(platform_get_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080098 * platform_get_resource_byname - get a resource for a device by name
99 * @dev: platform device
100 * @type: resource type
101 * @name: resource name
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800103struct resource *platform_get_resource_byname(struct platform_device *dev,
Linus Walleijc0afe7b2009-04-27 02:38:16 +0200104 unsigned int type,
105 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106{
107 int i;
108
109 for (i = 0; i < dev->num_resources; i++) {
110 struct resource *r = &dev->resource[i];
111
Peter Ujfalusi1b8cb922012-08-23 17:10:00 +0300112 if (unlikely(!r->name))
113 continue;
114
Magnus Dammc9f66162008-10-15 22:05:15 -0700115 if (type == resource_type(r) && !strcmp(r->name, name))
116 return r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 }
118 return NULL;
119}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500120EXPORT_SYMBOL_GPL(platform_get_resource_byname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
122/**
Wolfram Sangd6ff8552012-11-13 17:47:13 +0100123 * platform_get_irq_byname - get an IRQ for a device by name
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800124 * @dev: platform device
125 * @name: IRQ name
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 */
Linus Walleijc0afe7b2009-04-27 02:38:16 +0200127int platform_get_irq_byname(struct platform_device *dev, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800129 struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
130 name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
David Vrabel305b3222006-01-19 17:52:27 +0000132 return r ? r->start : -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500134EXPORT_SYMBOL_GPL(platform_get_irq_byname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
136/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800137 * platform_add_devices - add a numbers of platform devices
138 * @devs: array of platform devices to add
139 * @num: number of platform devices in array
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 */
141int platform_add_devices(struct platform_device **devs, int num)
142{
143 int i, ret = 0;
144
145 for (i = 0; i < num; i++) {
146 ret = platform_device_register(devs[i]);
147 if (ret) {
148 while (--i >= 0)
149 platform_device_unregister(devs[i]);
150 break;
151 }
152 }
153
154 return ret;
155}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500156EXPORT_SYMBOL_GPL(platform_add_devices);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Russell King37c12e72005-11-05 21:19:33 +0000158struct platform_object {
159 struct platform_device pdev;
160 char name[1];
161};
162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000164 * platform_device_put - destroy a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800165 * @pdev: platform device to free
Russell King37c12e72005-11-05 21:19:33 +0000166 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800167 * Free all memory associated with a platform device. This function must
168 * _only_ be externally called in error cases. All other usage is a bug.
Russell King37c12e72005-11-05 21:19:33 +0000169 */
170void platform_device_put(struct platform_device *pdev)
171{
172 if (pdev)
173 put_device(&pdev->dev);
174}
175EXPORT_SYMBOL_GPL(platform_device_put);
176
177static void platform_device_release(struct device *dev)
178{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800179 struct platform_object *pa = container_of(dev, struct platform_object,
180 pdev.dev);
Russell King37c12e72005-11-05 21:19:33 +0000181
Grant Likely7096d042010-10-20 11:45:13 -0600182 of_device_node_put(&pa->pdev.dev);
Russell King37c12e72005-11-05 21:19:33 +0000183 kfree(pa->pdev.dev.platform_data);
Samuel Ortize710d7d2011-04-08 00:43:01 +0200184 kfree(pa->pdev.mfd_cell);
Russell King37c12e72005-11-05 21:19:33 +0000185 kfree(pa->pdev.resource);
186 kfree(pa);
187}
188
189/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000190 * platform_device_alloc - create a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800191 * @name: base name of the device we're adding
192 * @id: instance id
Russell King37c12e72005-11-05 21:19:33 +0000193 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800194 * Create a platform device object which can have other objects attached
195 * to it, and which will have attached objects freed when it is released.
Russell King37c12e72005-11-05 21:19:33 +0000196 */
Jean Delvare1359555e2007-09-09 12:54:16 +0200197struct platform_device *platform_device_alloc(const char *name, int id)
Russell King37c12e72005-11-05 21:19:33 +0000198{
199 struct platform_object *pa;
200
201 pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
202 if (pa) {
203 strcpy(pa->name, name);
204 pa->pdev.name = pa->name;
205 pa->pdev.id = id;
206 device_initialize(&pa->pdev.dev);
207 pa->pdev.dev.release = platform_device_release;
Kumar Galaa77ce812011-06-10 01:52:57 -0500208 arch_setup_pdev_archdata(&pa->pdev);
Russell King37c12e72005-11-05 21:19:33 +0000209 }
210
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500211 return pa ? &pa->pdev : NULL;
Russell King37c12e72005-11-05 21:19:33 +0000212}
213EXPORT_SYMBOL_GPL(platform_device_alloc);
214
215/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000216 * platform_device_add_resources - add resources to a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800217 * @pdev: platform device allocated by platform_device_alloc to add resources to
218 * @res: set of resources that needs to be allocated for the device
219 * @num: number of resources
Russell King37c12e72005-11-05 21:19:33 +0000220 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800221 * Add a copy of the resources to the platform device. The memory
222 * associated with the resources will be freed when the platform device is
223 * released.
Russell King37c12e72005-11-05 21:19:33 +0000224 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800225int platform_device_add_resources(struct platform_device *pdev,
Geert Uytterhoeven0b7f1a72009-01-28 21:01:02 +0100226 const struct resource *res, unsigned int num)
Russell King37c12e72005-11-05 21:19:33 +0000227{
Uwe Kleine-Königcea89622011-04-20 09:44:44 +0200228 struct resource *r = NULL;
Russell King37c12e72005-11-05 21:19:33 +0000229
Uwe Kleine-Königcea89622011-04-20 09:44:44 +0200230 if (res) {
231 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
232 if (!r)
233 return -ENOMEM;
Russell King37c12e72005-11-05 21:19:33 +0000234 }
Uwe Kleine-Königcea89622011-04-20 09:44:44 +0200235
Uwe Kleine-König4a03d6f2011-04-20 09:44:45 +0200236 kfree(pdev->resource);
Uwe Kleine-Königcea89622011-04-20 09:44:44 +0200237 pdev->resource = r;
238 pdev->num_resources = num;
239 return 0;
Russell King37c12e72005-11-05 21:19:33 +0000240}
241EXPORT_SYMBOL_GPL(platform_device_add_resources);
242
243/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000244 * platform_device_add_data - add platform-specific data to a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800245 * @pdev: platform device allocated by platform_device_alloc to add resources to
246 * @data: platform specific data for this platform device
247 * @size: size of platform specific data
Russell King37c12e72005-11-05 21:19:33 +0000248 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800249 * Add a copy of platform specific data to the platform device's
250 * platform_data pointer. The memory associated with the platform data
251 * will be freed when the platform device is released.
Russell King37c12e72005-11-05 21:19:33 +0000252 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800253int platform_device_add_data(struct platform_device *pdev, const void *data,
254 size_t size)
Russell King37c12e72005-11-05 21:19:33 +0000255{
Uwe Kleine-König27a33f92011-04-20 09:44:42 +0200256 void *d = NULL;
Russell King37c12e72005-11-05 21:19:33 +0000257
Uwe Kleine-König27a33f92011-04-20 09:44:42 +0200258 if (data) {
259 d = kmemdup(data, size, GFP_KERNEL);
260 if (!d)
261 return -ENOMEM;
Russell King37c12e72005-11-05 21:19:33 +0000262 }
Uwe Kleine-König27a33f92011-04-20 09:44:42 +0200263
Uwe Kleine-König251e0312011-04-20 09:44:43 +0200264 kfree(pdev->dev.platform_data);
Uwe Kleine-König27a33f92011-04-20 09:44:42 +0200265 pdev->dev.platform_data = d;
266 return 0;
Russell King37c12e72005-11-05 21:19:33 +0000267}
268EXPORT_SYMBOL_GPL(platform_device_add_data);
269
270/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800271 * platform_device_add - add a platform device to device hierarchy
272 * @pdev: platform device we're adding
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800274 * This is part 2 of platform_device_register(), though may be called
275 * separately _iff_ pdev was allocated by platform_device_alloc().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 */
Russell King37c12e72005-11-05 21:19:33 +0000277int platform_device_add(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278{
Jean Delvare689ae232012-07-27 22:14:59 +0200279 int i, ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
281 if (!pdev)
282 return -EINVAL;
283
284 if (!pdev->dev.parent)
285 pdev->dev.parent = &platform_bus;
286
287 pdev->dev.bus = &platform_bus_type;
288
Jean Delvare689ae232012-07-27 22:14:59 +0200289 switch (pdev->id) {
290 default:
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100291 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
Jean Delvare689ae232012-07-27 22:14:59 +0200292 break;
293 case PLATFORM_DEVID_NONE:
Greg Kroah-Hartmanacc0e902009-06-02 15:39:55 -0700294 dev_set_name(&pdev->dev, "%s", pdev->name);
Jean Delvare689ae232012-07-27 22:14:59 +0200295 break;
296 case PLATFORM_DEVID_AUTO:
297 /*
298 * Automatically allocated device ID. We mark it as such so
299 * that we remember it must be freed, and we append a suffix
300 * to avoid namespace collision with explicit IDs.
301 */
302 ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL);
303 if (ret < 0)
304 goto err_out;
305 pdev->id = ret;
306 pdev->id_auto = true;
307 dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
308 break;
309 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
311 for (i = 0; i < pdev->num_resources; i++) {
312 struct resource *p, *r = &pdev->resource[i];
313
314 if (r->name == NULL)
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100315 r->name = dev_name(&pdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
317 p = r->parent;
318 if (!p) {
Magnus Dammc9f66162008-10-15 22:05:15 -0700319 if (resource_type(r) == IORESOURCE_MEM)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 p = &iomem_resource;
Magnus Dammc9f66162008-10-15 22:05:15 -0700321 else if (resource_type(r) == IORESOURCE_IO)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 p = &ioport_resource;
323 }
324
Kumar Galad960bb42005-11-28 10:15:39 -0600325 if (p && insert_resource(p, r)) {
Fabio Porcedda0258e182013-03-26 10:35:16 +0100326 dev_err(&pdev->dev, "failed to claim resource %d\n", i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 ret = -EBUSY;
328 goto failed;
329 }
330 }
331
332 pr_debug("Registering platform device '%s'. Parent at %s\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100333 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
Russell Kinge3915532006-05-06 08:15:26 +0100335 ret = device_add(&pdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 if (ret == 0)
337 return ret;
338
339 failed:
Jean Delvare689ae232012-07-27 22:14:59 +0200340 if (pdev->id_auto) {
341 ida_simple_remove(&platform_devid_ida, pdev->id);
342 pdev->id = PLATFORM_DEVID_AUTO;
343 }
344
Magnus Dammc9f66162008-10-15 22:05:15 -0700345 while (--i >= 0) {
346 struct resource *r = &pdev->resource[i];
347 unsigned long type = resource_type(r);
348
349 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
350 release_resource(r);
351 }
352
Jean Delvare689ae232012-07-27 22:14:59 +0200353 err_out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 return ret;
355}
Russell King37c12e72005-11-05 21:19:33 +0000356EXPORT_SYMBOL_GPL(platform_device_add);
357
358/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800359 * platform_device_del - remove a platform-level device
360 * @pdev: platform device we're removing
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500361 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800362 * Note that this function will also release all memory- and port-based
363 * resources owned by the device (@dev->resource). This function must
364 * _only_ be externally called in error cases. All other usage is a bug.
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500365 */
366void platform_device_del(struct platform_device *pdev)
367{
368 int i;
369
370 if (pdev) {
Jean Delvaredc4c15d2007-05-02 20:55:54 +0200371 device_del(&pdev->dev);
372
Jean Delvare689ae232012-07-27 22:14:59 +0200373 if (pdev->id_auto) {
374 ida_simple_remove(&platform_devid_ida, pdev->id);
375 pdev->id = PLATFORM_DEVID_AUTO;
376 }
377
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500378 for (i = 0; i < pdev->num_resources; i++) {
379 struct resource *r = &pdev->resource[i];
Magnus Dammc9f66162008-10-15 22:05:15 -0700380 unsigned long type = resource_type(r);
381
382 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500383 release_resource(r);
384 }
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500385 }
386}
387EXPORT_SYMBOL_GPL(platform_device_del);
388
389/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800390 * platform_device_register - add a platform-level device
391 * @pdev: platform device we're adding
Russell King37c12e72005-11-05 21:19:33 +0000392 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800393int platform_device_register(struct platform_device *pdev)
Russell King37c12e72005-11-05 21:19:33 +0000394{
395 device_initialize(&pdev->dev);
Kumar Galaa77ce812011-06-10 01:52:57 -0500396 arch_setup_pdev_archdata(pdev);
Russell King37c12e72005-11-05 21:19:33 +0000397 return platform_device_add(pdev);
398}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500399EXPORT_SYMBOL_GPL(platform_device_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
401/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800402 * platform_device_unregister - unregister a platform-level device
403 * @pdev: platform device we're unregistering
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800405 * Unregistration is done in 2 steps. First we release all resources
406 * and remove it from the subsystem, then we drop reference count by
407 * calling platform_device_put().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800409void platform_device_unregister(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410{
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500411 platform_device_del(pdev);
412 platform_device_put(pdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500414EXPORT_SYMBOL_GPL(platform_device_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416/**
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200417 * platform_device_register_full - add a platform-level device with
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200418 * resources and platform-specific data
419 *
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200420 * @pdevinfo: data used to create device
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700421 *
Jani Nikulaf0eae0e2010-03-11 18:11:45 +0200422 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700423 */
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200424struct platform_device *platform_device_register_full(
Uwe Kleine-König5a3072b2011-12-08 22:53:29 +0100425 const struct platform_device_info *pdevinfo)
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700426{
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200427 int ret = -ENOMEM;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700428 struct platform_device *pdev;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700429
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200430 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200431 if (!pdev)
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200432 goto err_alloc;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700433
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200434 pdev->dev.parent = pdevinfo->parent;
Rafael J. Wysocki863f9f32012-11-21 00:21:59 +0100435 ACPI_HANDLE_SET(&pdev->dev, pdevinfo->acpi_node.handle);
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700436
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200437 if (pdevinfo->dma_mask) {
438 /*
439 * This memory isn't freed when the device is put,
440 * I don't have a nice idea for that though. Conceptually
441 * dma_mask in struct device should not be a pointer.
442 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
443 */
444 pdev->dev.dma_mask =
445 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
446 if (!pdev->dev.dma_mask)
447 goto err;
448
449 *pdev->dev.dma_mask = pdevinfo->dma_mask;
450 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
451 }
452
453 ret = platform_device_add_resources(pdev,
454 pdevinfo->res, pdevinfo->num_res);
Anton Vorontsov807508c2010-09-07 17:31:54 +0400455 if (ret)
456 goto err;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700457
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200458 ret = platform_device_add_data(pdev,
459 pdevinfo->data, pdevinfo->size_data);
Anton Vorontsov807508c2010-09-07 17:31:54 +0400460 if (ret)
461 goto err;
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200462
463 ret = platform_device_add(pdev);
464 if (ret) {
465err:
Rafael J. Wysocki863f9f32012-11-21 00:21:59 +0100466 ACPI_HANDLE_SET(&pdev->dev, NULL);
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200467 kfree(pdev->dev.dma_mask);
468
469err_alloc:
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200470 platform_device_put(pdev);
471 return ERR_PTR(ret);
472 }
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700473
474 return pdev;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700475}
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200476EXPORT_SYMBOL_GPL(platform_device_register_full);
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700477
Russell King00d3dcd2005-11-09 17:23:39 +0000478static int platform_drv_probe(struct device *_dev)
479{
480 struct platform_driver *drv = to_platform_driver(_dev->driver);
481 struct platform_device *dev = to_platform_device(_dev);
Rafael J. Wysocki94d76d52012-11-26 10:04:53 +0100482 int ret;
Russell King00d3dcd2005-11-09 17:23:39 +0000483
Rafael J. Wysocki94d76d52012-11-26 10:04:53 +0100484 if (ACPI_HANDLE(_dev))
485 acpi_dev_pm_attach(_dev, true);
486
487 ret = drv->probe(dev);
488 if (ret && ACPI_HANDLE(_dev))
489 acpi_dev_pm_detach(_dev, true);
490
491 return ret;
Russell King00d3dcd2005-11-09 17:23:39 +0000492}
493
David Brownellc67334f2006-11-16 23:28:47 -0800494static int platform_drv_probe_fail(struct device *_dev)
495{
496 return -ENXIO;
497}
498
Russell King00d3dcd2005-11-09 17:23:39 +0000499static int platform_drv_remove(struct device *_dev)
500{
501 struct platform_driver *drv = to_platform_driver(_dev->driver);
502 struct platform_device *dev = to_platform_device(_dev);
Rafael J. Wysocki94d76d52012-11-26 10:04:53 +0100503 int ret;
Russell King00d3dcd2005-11-09 17:23:39 +0000504
Rafael J. Wysocki94d76d52012-11-26 10:04:53 +0100505 ret = drv->remove(dev);
506 if (ACPI_HANDLE(_dev))
507 acpi_dev_pm_detach(_dev, true);
508
509 return ret;
Russell King00d3dcd2005-11-09 17:23:39 +0000510}
511
512static void platform_drv_shutdown(struct device *_dev)
513{
514 struct platform_driver *drv = to_platform_driver(_dev->driver);
515 struct platform_device *dev = to_platform_device(_dev);
516
517 drv->shutdown(dev);
Rafael J. Wysocki94d76d52012-11-26 10:04:53 +0100518 if (ACPI_HANDLE(_dev))
519 acpi_dev_pm_detach(_dev, true);
Russell King00d3dcd2005-11-09 17:23:39 +0000520}
521
Russell King00d3dcd2005-11-09 17:23:39 +0000522/**
Libo Chen94470572013-05-25 12:40:50 +0800523 * __platform_driver_register - register a driver for platform-level devices
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800524 * @drv: platform driver structure
Randy Dunlap08801f92013-07-14 17:43:06 -0700525 * @owner: owning module/driver
Russell King00d3dcd2005-11-09 17:23:39 +0000526 */
Libo Chen94470572013-05-25 12:40:50 +0800527int __platform_driver_register(struct platform_driver *drv,
528 struct module *owner)
Russell King00d3dcd2005-11-09 17:23:39 +0000529{
Libo Chen94470572013-05-25 12:40:50 +0800530 drv->driver.owner = owner;
Russell King00d3dcd2005-11-09 17:23:39 +0000531 drv->driver.bus = &platform_bus_type;
532 if (drv->probe)
533 drv->driver.probe = platform_drv_probe;
534 if (drv->remove)
535 drv->driver.remove = platform_drv_remove;
536 if (drv->shutdown)
537 drv->driver.shutdown = platform_drv_shutdown;
Magnus Damm783ea7d2009-06-04 22:13:33 +0200538
Russell King00d3dcd2005-11-09 17:23:39 +0000539 return driver_register(&drv->driver);
540}
Libo Chen94470572013-05-25 12:40:50 +0800541EXPORT_SYMBOL_GPL(__platform_driver_register);
Russell King00d3dcd2005-11-09 17:23:39 +0000542
543/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000544 * platform_driver_unregister - unregister a driver for platform-level devices
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800545 * @drv: platform driver structure
Russell King00d3dcd2005-11-09 17:23:39 +0000546 */
547void platform_driver_unregister(struct platform_driver *drv)
548{
549 driver_unregister(&drv->driver);
550}
551EXPORT_SYMBOL_GPL(platform_driver_unregister);
552
David Brownellc67334f2006-11-16 23:28:47 -0800553/**
554 * platform_driver_probe - register driver for non-hotpluggable device
555 * @drv: platform driver structure
Fabio Porcedda647c86d2013-03-26 10:35:15 +0100556 * @probe: the driver probe routine, probably from an __init section,
557 * must not return -EPROBE_DEFER.
David Brownellc67334f2006-11-16 23:28:47 -0800558 *
559 * Use this instead of platform_driver_register() when you know the device
560 * is not hotpluggable and has already been registered, and you want to
561 * remove its run-once probe() infrastructure from memory after the driver
562 * has bound to the device.
563 *
564 * One typical use for this would be with drivers for controllers integrated
565 * into system-on-chip processors, where the controller devices have been
566 * configured as part of board setup.
567 *
Fabio Porcedda647c86d2013-03-26 10:35:15 +0100568 * This is incompatible with deferred probing so probe() must not
569 * return -EPROBE_DEFER.
570 *
David Brownellc67334f2006-11-16 23:28:47 -0800571 * Returns zero if the driver registered and bound to a device, else returns
572 * a negative error code and with the driver not registered.
573 */
Andrew Mortonc63e0782006-12-04 14:56:36 -0800574int __init_or_module platform_driver_probe(struct platform_driver *drv,
David Brownellc67334f2006-11-16 23:28:47 -0800575 int (*probe)(struct platform_device *))
576{
577 int retval, code;
578
Dmitry Torokhov1a6f2a72009-10-12 20:17:41 -0700579 /* make sure driver won't have bind/unbind attributes */
580 drv->driver.suppress_bind_attrs = true;
581
David Brownellc67334f2006-11-16 23:28:47 -0800582 /* temporary section violation during probe() */
583 drv->probe = probe;
584 retval = code = platform_driver_register(drv);
585
Dmitry Torokhov1a6f2a72009-10-12 20:17:41 -0700586 /*
587 * Fixup that section violation, being paranoid about code scanning
David Brownellc67334f2006-11-16 23:28:47 -0800588 * the list of drivers in order to probe new devices. Check to see
589 * if the probe was successful, and make sure any forced probes of
590 * new devices fail.
591 */
Patrick Pannutod79d3242010-08-06 17:12:41 -0700592 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
David Brownellc67334f2006-11-16 23:28:47 -0800593 drv->probe = NULL;
Greg Kroah-Hartmane5dd1272007-11-28 15:59:15 -0800594 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
David Brownellc67334f2006-11-16 23:28:47 -0800595 retval = -ENODEV;
596 drv->driver.probe = platform_drv_probe_fail;
Patrick Pannutod79d3242010-08-06 17:12:41 -0700597 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
David Brownellc67334f2006-11-16 23:28:47 -0800598
599 if (code != retval)
600 platform_driver_unregister(drv);
601 return retval;
602}
603EXPORT_SYMBOL_GPL(platform_driver_probe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800605/**
606 * platform_create_bundle - register driver and create corresponding device
607 * @driver: platform driver structure
608 * @probe: the driver probe routine, probably from an __init section
609 * @res: set of resources that needs to be allocated for the device
610 * @n_res: number of resources
611 * @data: platform specific data for this platform device
612 * @size: size of platform specific data
613 *
614 * Use this in legacy-style modules that probe hardware directly and
615 * register a single platform device and corresponding platform driver.
Jani Nikulaf0eae0e2010-03-11 18:11:45 +0200616 *
617 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800618 */
619struct platform_device * __init_or_module platform_create_bundle(
620 struct platform_driver *driver,
621 int (*probe)(struct platform_device *),
622 struct resource *res, unsigned int n_res,
623 const void *data, size_t size)
624{
625 struct platform_device *pdev;
626 int error;
627
628 pdev = platform_device_alloc(driver->driver.name, -1);
629 if (!pdev) {
630 error = -ENOMEM;
631 goto err_out;
632 }
633
Anton Vorontsov807508c2010-09-07 17:31:54 +0400634 error = platform_device_add_resources(pdev, res, n_res);
635 if (error)
636 goto err_pdev_put;
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800637
Anton Vorontsov807508c2010-09-07 17:31:54 +0400638 error = platform_device_add_data(pdev, data, size);
639 if (error)
640 goto err_pdev_put;
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800641
642 error = platform_device_add(pdev);
643 if (error)
644 goto err_pdev_put;
645
646 error = platform_driver_probe(driver, probe);
647 if (error)
648 goto err_pdev_del;
649
650 return pdev;
651
652err_pdev_del:
653 platform_device_del(pdev);
654err_pdev_put:
655 platform_device_put(pdev);
656err_out:
657 return ERR_PTR(error);
658}
659EXPORT_SYMBOL_GPL(platform_create_bundle);
660
David Brownella0245f72006-05-29 10:37:33 -0700661/* modalias support enables more hands-off userspace setup:
662 * (a) environment variable lets new-style hotplug events work once system is
663 * fully running: "modprobe $MODALIAS"
664 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
665 * mishandled before system is fully running: "modprobe $(cat modalias)"
666 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800667static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
668 char *buf)
David Brownella0245f72006-05-29 10:37:33 -0700669{
670 struct platform_device *pdev = to_platform_device(dev);
Kay Sievers43cc71e2007-08-18 04:40:39 +0200671 int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
David Brownella0245f72006-05-29 10:37:33 -0700672
673 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
674}
675
676static struct device_attribute platform_dev_attrs[] = {
677 __ATTR_RO(modalias),
678 __ATTR_NULL,
679};
680
Kay Sievers7eff2e72007-08-14 15:15:12 +0200681static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
David Brownella0245f72006-05-29 10:37:33 -0700682{
683 struct platform_device *pdev = to_platform_device(dev);
Grant Likelyeca39302010-06-08 07:48:21 -0600684 int rc;
685
686 /* Some devices have extra OF data and an OF-style MODALIAS */
Fabio Porcedda0258e182013-03-26 10:35:16 +0100687 rc = of_device_uevent_modalias(dev, env);
Grant Likelyeca39302010-06-08 07:48:21 -0600688 if (rc != -ENODEV)
689 return rc;
David Brownella0245f72006-05-29 10:37:33 -0700690
Eric Miao57fee4a2009-02-04 11:52:40 +0800691 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
Sebastian Andrzej Siewior0a268132011-08-15 16:51:22 +0200692 pdev->name);
David Brownella0245f72006-05-29 10:37:33 -0700693 return 0;
694}
695
Eric Miao57fee4a2009-02-04 11:52:40 +0800696static const struct platform_device_id *platform_match_id(
Uwe Kleine-König831fad22010-01-26 09:35:00 +0100697 const struct platform_device_id *id,
Eric Miao57fee4a2009-02-04 11:52:40 +0800698 struct platform_device *pdev)
699{
700 while (id->name[0]) {
701 if (strcmp(pdev->name, id->name) == 0) {
702 pdev->id_entry = id;
703 return id;
704 }
705 id++;
706 }
707 return NULL;
708}
709
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800711 * platform_match - bind platform device to platform driver.
712 * @dev: device.
713 * @drv: driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800715 * Platform device IDs are assumed to be encoded like this:
716 * "<name><instance>", where <name> is a short description of the type of
717 * device, like "pci" or "floppy", and <instance> is the enumerated
718 * instance of the device, like '0' or '42'. Driver IDs are simply
719 * "<name>". So, extract the <name> from the platform_device structure,
720 * and compare it against the name of the driver. Return whether they match
721 * or not.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800723static int platform_match(struct device *dev, struct device_driver *drv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724{
Eric Miao71b3e0c2009-01-31 22:47:44 +0800725 struct platform_device *pdev = to_platform_device(dev);
Eric Miao57fee4a2009-02-04 11:52:40 +0800726 struct platform_driver *pdrv = to_platform_driver(drv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
Grant Likely05212152010-06-08 07:48:20 -0600728 /* Attempt an OF style match first */
729 if (of_driver_match_device(dev, drv))
730 return 1;
731
Mika Westerberg91e56872012-10-31 22:45:02 +0100732 /* Then try ACPI style match */
733 if (acpi_driver_match_device(dev, drv))
734 return 1;
735
Grant Likely05212152010-06-08 07:48:20 -0600736 /* Then try to match against the id table */
Eric Miao57fee4a2009-02-04 11:52:40 +0800737 if (pdrv->id_table)
738 return platform_match_id(pdrv->id_table, pdev) != NULL;
739
740 /* fall-back to driver name match */
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100741 return (strcmp(pdev->name, drv->name) == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742}
743
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200744#ifdef CONFIG_PM_SLEEP
745
746static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747{
Magnus Damm783ea7d2009-06-04 22:13:33 +0200748 struct platform_driver *pdrv = to_platform_driver(dev->driver);
749 struct platform_device *pdev = to_platform_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 int ret = 0;
751
Magnus Damm783ea7d2009-06-04 22:13:33 +0200752 if (dev->driver && pdrv->suspend)
753 ret = pdrv->suspend(pdev, mesg);
David Brownell386415d2006-09-03 13:16:45 -0700754
755 return ret;
756}
757
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200758static int platform_legacy_resume(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759{
Magnus Damm783ea7d2009-06-04 22:13:33 +0200760 struct platform_driver *pdrv = to_platform_driver(dev->driver);
761 struct platform_device *pdev = to_platform_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 int ret = 0;
763
Magnus Damm783ea7d2009-06-04 22:13:33 +0200764 if (dev->driver && pdrv->resume)
765 ret = pdrv->resume(pdev);
Russell King9480e302005-10-28 09:52:56 -0700766
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 return ret;
768}
769
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200770#endif /* CONFIG_PM_SLEEP */
Magnus Damm9d730222009-08-20 20:25:32 +0200771
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200772#ifdef CONFIG_SUSPEND
773
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200774int platform_pm_suspend(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200775{
776 struct device_driver *drv = dev->driver;
777 int ret = 0;
778
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200779 if (!drv)
780 return 0;
781
782 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200783 if (drv->pm->suspend)
784 ret = drv->pm->suspend(dev);
785 } else {
786 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
787 }
788
789 return ret;
790}
791
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200792int platform_pm_resume(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200793{
794 struct device_driver *drv = dev->driver;
795 int ret = 0;
796
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200797 if (!drv)
798 return 0;
799
800 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200801 if (drv->pm->resume)
802 ret = drv->pm->resume(dev);
803 } else {
804 ret = platform_legacy_resume(dev);
805 }
806
807 return ret;
808}
809
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200810#endif /* CONFIG_SUSPEND */
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200811
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +0200812#ifdef CONFIG_HIBERNATE_CALLBACKS
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200813
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200814int platform_pm_freeze(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200815{
816 struct device_driver *drv = dev->driver;
817 int ret = 0;
818
819 if (!drv)
820 return 0;
821
822 if (drv->pm) {
823 if (drv->pm->freeze)
824 ret = drv->pm->freeze(dev);
825 } else {
826 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
827 }
828
829 return ret;
830}
831
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200832int platform_pm_thaw(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200833{
834 struct device_driver *drv = dev->driver;
835 int ret = 0;
836
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200837 if (!drv)
838 return 0;
839
840 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200841 if (drv->pm->thaw)
842 ret = drv->pm->thaw(dev);
843 } else {
844 ret = platform_legacy_resume(dev);
845 }
846
847 return ret;
848}
849
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200850int platform_pm_poweroff(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200851{
852 struct device_driver *drv = dev->driver;
853 int ret = 0;
854
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200855 if (!drv)
856 return 0;
857
858 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200859 if (drv->pm->poweroff)
860 ret = drv->pm->poweroff(dev);
861 } else {
862 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
863 }
864
865 return ret;
866}
867
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200868int platform_pm_restore(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200869{
870 struct device_driver *drv = dev->driver;
871 int ret = 0;
872
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200873 if (!drv)
874 return 0;
875
876 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200877 if (drv->pm->restore)
878 ret = drv->pm->restore(dev);
879 } else {
880 ret = platform_legacy_resume(dev);
881 }
882
883 return ret;
884}
885
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200886#endif /* CONFIG_HIBERNATE_CALLBACKS */
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200887
Dmitry Torokhovd9ab7712009-07-22 00:37:25 +0200888static const struct dev_pm_ops platform_dev_pm_ops = {
Rafael J. Wysocki8b313a32011-04-29 00:36:32 +0200889 .runtime_suspend = pm_generic_runtime_suspend,
890 .runtime_resume = pm_generic_runtime_resume,
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200891 USE_PLATFORM_PM_SLEEP_OPS
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200892};
893
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894struct bus_type platform_bus_type = {
895 .name = "platform",
David Brownella0245f72006-05-29 10:37:33 -0700896 .dev_attrs = platform_dev_attrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 .match = platform_match,
David Brownella0245f72006-05-29 10:37:33 -0700898 .uevent = platform_uevent,
Magnus Damm9d730222009-08-20 20:25:32 +0200899 .pm = &platform_dev_pm_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900};
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500901EXPORT_SYMBOL_GPL(platform_bus_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902
903int __init platform_bus_init(void)
904{
Cornelia Huckfbfb1442006-11-27 10:35:08 +0100905 int error;
906
Magnus Damm13977092009-03-30 14:37:25 -0700907 early_platform_cleanup();
908
Cornelia Huckfbfb1442006-11-27 10:35:08 +0100909 error = device_register(&platform_bus);
910 if (error)
911 return error;
912 error = bus_register(&platform_bus_type);
913 if (error)
914 device_unregister(&platform_bus);
915 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916}
917
918#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
919u64 dma_get_required_mask(struct device *dev)
920{
921 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
922 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
923 u64 mask;
924
925 if (!high_totalram) {
926 /* convert to mask just covering totalram */
927 low_totalram = (1 << (fls(low_totalram) - 1));
928 low_totalram += low_totalram - 1;
929 mask = low_totalram;
930 } else {
931 high_totalram = (1 << (fls(high_totalram) - 1));
932 high_totalram += high_totalram - 1;
933 mask = (((u64)high_totalram) << 32) + 0xffffffff;
934 }
James Bottomleye88a0c22008-03-09 11:57:56 -0500935 return mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936}
937EXPORT_SYMBOL_GPL(dma_get_required_mask);
938#endif
Magnus Damm13977092009-03-30 14:37:25 -0700939
940static __initdata LIST_HEAD(early_platform_driver_list);
941static __initdata LIST_HEAD(early_platform_device_list);
942
943/**
Magnus Damm4d26e1392010-03-10 20:50:38 +0900944 * early_platform_driver_register - register early platform driver
Randy Dunlapd86c1302009-04-21 07:22:53 -0700945 * @epdrv: early_platform driver structure
Magnus Damm13977092009-03-30 14:37:25 -0700946 * @buf: string passed from early_param()
Magnus Damm4d26e1392010-03-10 20:50:38 +0900947 *
948 * Helper function for early_platform_init() / early_platform_init_buffer()
Magnus Damm13977092009-03-30 14:37:25 -0700949 */
950int __init early_platform_driver_register(struct early_platform_driver *epdrv,
951 char *buf)
952{
Magnus Dammc60e0502009-11-27 17:38:51 +0900953 char *tmp;
Magnus Damm13977092009-03-30 14:37:25 -0700954 int n;
955
956 /* Simply add the driver to the end of the global list.
957 * Drivers will by default be put on the list in compiled-in order.
958 */
959 if (!epdrv->list.next) {
960 INIT_LIST_HEAD(&epdrv->list);
961 list_add_tail(&epdrv->list, &early_platform_driver_list);
962 }
963
964 /* If the user has specified device then make sure the driver
965 * gets prioritized. The driver of the last device specified on
966 * command line will be put first on the list.
967 */
968 n = strlen(epdrv->pdrv->driver.name);
969 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
970 list_move(&epdrv->list, &early_platform_driver_list);
971
Magnus Dammc60e0502009-11-27 17:38:51 +0900972 /* Allow passing parameters after device name */
973 if (buf[n] == '\0' || buf[n] == ',')
Magnus Damm13977092009-03-30 14:37:25 -0700974 epdrv->requested_id = -1;
Magnus Dammc60e0502009-11-27 17:38:51 +0900975 else {
976 epdrv->requested_id = simple_strtoul(&buf[n + 1],
977 &tmp, 10);
978
979 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
980 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
981 n = 0;
982 } else
983 n += strcspn(&buf[n + 1], ",") + 1;
984 }
985
986 if (buf[n] == ',')
987 n++;
988
989 if (epdrv->bufsize) {
990 memcpy(epdrv->buffer, &buf[n],
991 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
992 epdrv->buffer[epdrv->bufsize - 1] = '\0';
993 }
Magnus Damm13977092009-03-30 14:37:25 -0700994 }
995
996 return 0;
997}
998
999/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001000 * early_platform_add_devices - adds a number of early platform devices
Magnus Damm13977092009-03-30 14:37:25 -07001001 * @devs: array of early platform devices to add
1002 * @num: number of early platform devices in array
Magnus Damm4d26e1392010-03-10 20:50:38 +09001003 *
1004 * Used by early architecture code to register early platform devices and
1005 * their platform data.
Magnus Damm13977092009-03-30 14:37:25 -07001006 */
1007void __init early_platform_add_devices(struct platform_device **devs, int num)
1008{
1009 struct device *dev;
1010 int i;
1011
1012 /* simply add the devices to list */
1013 for (i = 0; i < num; i++) {
1014 dev = &devs[i]->dev;
1015
1016 if (!dev->devres_head.next) {
Rafael J. Wysockibed2b422012-08-06 01:45:11 +02001017 pm_runtime_early_init(dev);
Magnus Damm13977092009-03-30 14:37:25 -07001018 INIT_LIST_HEAD(&dev->devres_head);
1019 list_add_tail(&dev->devres_head,
1020 &early_platform_device_list);
1021 }
1022 }
1023}
1024
1025/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001026 * early_platform_driver_register_all - register early platform drivers
Magnus Damm13977092009-03-30 14:37:25 -07001027 * @class_str: string to identify early platform driver class
Magnus Damm4d26e1392010-03-10 20:50:38 +09001028 *
1029 * Used by architecture code to register all early platform drivers
1030 * for a certain class. If omitted then only early platform drivers
1031 * with matching kernel command line class parameters will be registered.
Magnus Damm13977092009-03-30 14:37:25 -07001032 */
1033void __init early_platform_driver_register_all(char *class_str)
1034{
1035 /* The "class_str" parameter may or may not be present on the kernel
1036 * command line. If it is present then there may be more than one
1037 * matching parameter.
1038 *
1039 * Since we register our early platform drivers using early_param()
1040 * we need to make sure that they also get registered in the case
1041 * when the parameter is missing from the kernel command line.
1042 *
1043 * We use parse_early_options() to make sure the early_param() gets
1044 * called at least once. The early_param() may be called more than
1045 * once since the name of the preferred device may be specified on
1046 * the kernel command line. early_platform_driver_register() handles
1047 * this case for us.
1048 */
1049 parse_early_options(class_str);
1050}
1051
1052/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001053 * early_platform_match - find early platform device matching driver
Randy Dunlapd86c1302009-04-21 07:22:53 -07001054 * @epdrv: early platform driver structure
Magnus Damm13977092009-03-30 14:37:25 -07001055 * @id: id to match against
1056 */
1057static __init struct platform_device *
1058early_platform_match(struct early_platform_driver *epdrv, int id)
1059{
1060 struct platform_device *pd;
1061
1062 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1063 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1064 if (pd->id == id)
1065 return pd;
1066
1067 return NULL;
1068}
1069
1070/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001071 * early_platform_left - check if early platform driver has matching devices
Randy Dunlapd86c1302009-04-21 07:22:53 -07001072 * @epdrv: early platform driver structure
Magnus Damm13977092009-03-30 14:37:25 -07001073 * @id: return true if id or above exists
1074 */
1075static __init int early_platform_left(struct early_platform_driver *epdrv,
1076 int id)
1077{
1078 struct platform_device *pd;
1079
1080 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1081 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1082 if (pd->id >= id)
1083 return 1;
1084
1085 return 0;
1086}
1087
1088/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001089 * early_platform_driver_probe_id - probe drivers matching class_str and id
Magnus Damm13977092009-03-30 14:37:25 -07001090 * @class_str: string to identify early platform driver class
1091 * @id: id to match against
1092 * @nr_probe: number of platform devices to successfully probe before exiting
1093 */
1094static int __init early_platform_driver_probe_id(char *class_str,
1095 int id,
1096 int nr_probe)
1097{
1098 struct early_platform_driver *epdrv;
1099 struct platform_device *match;
1100 int match_id;
1101 int n = 0;
1102 int left = 0;
1103
1104 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1105 /* only use drivers matching our class_str */
1106 if (strcmp(class_str, epdrv->class_str))
1107 continue;
1108
1109 if (id == -2) {
1110 match_id = epdrv->requested_id;
1111 left = 1;
1112
1113 } else {
1114 match_id = id;
1115 left += early_platform_left(epdrv, id);
1116
1117 /* skip requested id */
1118 switch (epdrv->requested_id) {
1119 case EARLY_PLATFORM_ID_ERROR:
1120 case EARLY_PLATFORM_ID_UNSET:
1121 break;
1122 default:
1123 if (epdrv->requested_id == id)
1124 match_id = EARLY_PLATFORM_ID_UNSET;
1125 }
1126 }
1127
1128 switch (match_id) {
1129 case EARLY_PLATFORM_ID_ERROR:
Fabio Porcedda0258e182013-03-26 10:35:16 +01001130 pr_warn("%s: unable to parse %s parameter\n",
1131 class_str, epdrv->pdrv->driver.name);
Magnus Damm13977092009-03-30 14:37:25 -07001132 /* fall-through */
1133 case EARLY_PLATFORM_ID_UNSET:
1134 match = NULL;
1135 break;
1136 default:
1137 match = early_platform_match(epdrv, match_id);
1138 }
1139
1140 if (match) {
Paul Mundta636ee72010-03-09 06:57:53 +00001141 /*
1142 * Set up a sensible init_name to enable
1143 * dev_name() and others to be used before the
1144 * rest of the driver core is initialized.
1145 */
Paul Mundt06fe53b2010-05-13 17:56:56 +09001146 if (!match->dev.init_name && slab_is_available()) {
Paul Mundta636ee72010-03-09 06:57:53 +00001147 if (match->id != -1)
Paul Mundtbd050862010-03-29 15:51:35 +09001148 match->dev.init_name =
1149 kasprintf(GFP_KERNEL, "%s.%d",
1150 match->name,
1151 match->id);
Paul Mundta636ee72010-03-09 06:57:53 +00001152 else
Paul Mundtbd050862010-03-29 15:51:35 +09001153 match->dev.init_name =
1154 kasprintf(GFP_KERNEL, "%s",
1155 match->name);
Paul Mundta636ee72010-03-09 06:57:53 +00001156
Paul Mundta636ee72010-03-09 06:57:53 +00001157 if (!match->dev.init_name)
1158 return -ENOMEM;
1159 }
Paul Mundtbd050862010-03-29 15:51:35 +09001160
Magnus Damm13977092009-03-30 14:37:25 -07001161 if (epdrv->pdrv->probe(match))
Fabio Porcedda0258e182013-03-26 10:35:16 +01001162 pr_warn("%s: unable to probe %s early.\n",
1163 class_str, match->name);
Magnus Damm13977092009-03-30 14:37:25 -07001164 else
1165 n++;
1166 }
1167
1168 if (n >= nr_probe)
1169 break;
1170 }
1171
1172 if (left)
1173 return n;
1174 else
1175 return -ENODEV;
1176}
1177
1178/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001179 * early_platform_driver_probe - probe a class of registered drivers
Magnus Damm13977092009-03-30 14:37:25 -07001180 * @class_str: string to identify early platform driver class
1181 * @nr_probe: number of platform devices to successfully probe before exiting
1182 * @user_only: only probe user specified early platform devices
Magnus Damm4d26e1392010-03-10 20:50:38 +09001183 *
1184 * Used by architecture code to probe registered early platform drivers
1185 * within a certain class. For probe to happen a registered early platform
1186 * device matching a registered early platform driver is needed.
Magnus Damm13977092009-03-30 14:37:25 -07001187 */
1188int __init early_platform_driver_probe(char *class_str,
1189 int nr_probe,
1190 int user_only)
1191{
1192 int k, n, i;
1193
1194 n = 0;
1195 for (i = -2; n < nr_probe; i++) {
1196 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1197
1198 if (k < 0)
1199 break;
1200
1201 n += k;
1202
1203 if (user_only)
1204 break;
1205 }
1206
1207 return n;
1208}
1209
1210/**
1211 * early_platform_cleanup - clean up early platform code
1212 */
1213void __init early_platform_cleanup(void)
1214{
1215 struct platform_device *pd, *pd2;
1216
1217 /* clean up the devres list used to chain devices */
1218 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1219 dev.devres_head) {
1220 list_del(&pd->dev.devres_head);
1221 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));
1222 }
1223}
1224