blob: c6c933f58102370d8ed738e2778cb11dad2e93fb [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/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080035 * platform_get_resource - get a resource for a device
36 * @dev: platform device
37 * @type: resource type
38 * @num: resource index
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080040struct resource *platform_get_resource(struct platform_device *dev,
41 unsigned int type, unsigned int num)
Linus Torvalds1da177e2005-04-16 15:20:36 -070042{
43 int i;
44
45 for (i = 0; i < dev->num_resources; i++) {
46 struct resource *r = &dev->resource[i];
47
Magnus Dammc9f66162008-10-15 22:05:15 -070048 if (type == resource_type(r) && num-- == 0)
49 return r;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 }
51 return NULL;
52}
Dmitry Torokhova96b2042005-12-10 01:36:28 -050053EXPORT_SYMBOL_GPL(platform_get_resource);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080056 * platform_get_irq - get an IRQ for a device
57 * @dev: platform device
58 * @num: IRQ number index
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 */
60int platform_get_irq(struct platform_device *dev, unsigned int num)
61{
62 struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
63
David Vrabel305b3222006-01-19 17:52:27 +000064 return r ? r->start : -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065}
Dmitry Torokhova96b2042005-12-10 01:36:28 -050066EXPORT_SYMBOL_GPL(platform_get_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
68/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080069 * platform_get_resource_byname - get a resource for a device by name
70 * @dev: platform device
71 * @type: resource type
72 * @name: resource name
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080074struct resource *platform_get_resource_byname(struct platform_device *dev,
Linus Walleijc0afe7b2009-04-27 02:38:16 +020075 unsigned int type,
76 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -070077{
78 int i;
79
80 for (i = 0; i < dev->num_resources; i++) {
81 struct resource *r = &dev->resource[i];
82
Magnus Dammc9f66162008-10-15 22:05:15 -070083 if (type == resource_type(r) && !strcmp(r->name, name))
84 return r;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 }
86 return NULL;
87}
Dmitry Torokhova96b2042005-12-10 01:36:28 -050088EXPORT_SYMBOL_GPL(platform_get_resource_byname);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
90/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080091 * platform_get_irq - get an IRQ for a device
92 * @dev: platform device
93 * @name: IRQ name
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 */
Linus Walleijc0afe7b2009-04-27 02:38:16 +020095int platform_get_irq_byname(struct platform_device *dev, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080097 struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
98 name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
David Vrabel305b3222006-01-19 17:52:27 +0000100 return r ? r->start : -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500102EXPORT_SYMBOL_GPL(platform_get_irq_byname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
104/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800105 * platform_add_devices - add a numbers of platform devices
106 * @devs: array of platform devices to add
107 * @num: number of platform devices in array
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 */
109int platform_add_devices(struct platform_device **devs, int num)
110{
111 int i, ret = 0;
112
113 for (i = 0; i < num; i++) {
114 ret = platform_device_register(devs[i]);
115 if (ret) {
116 while (--i >= 0)
117 platform_device_unregister(devs[i]);
118 break;
119 }
120 }
121
122 return ret;
123}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500124EXPORT_SYMBOL_GPL(platform_add_devices);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Russell King37c12e72005-11-05 21:19:33 +0000126struct platform_object {
127 struct platform_device pdev;
128 char name[1];
129};
130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000132 * platform_device_put - destroy a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800133 * @pdev: platform device to free
Russell King37c12e72005-11-05 21:19:33 +0000134 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800135 * Free all memory associated with a platform device. This function must
136 * _only_ be externally called in error cases. All other usage is a bug.
Russell King37c12e72005-11-05 21:19:33 +0000137 */
138void platform_device_put(struct platform_device *pdev)
139{
140 if (pdev)
141 put_device(&pdev->dev);
142}
143EXPORT_SYMBOL_GPL(platform_device_put);
144
145static void platform_device_release(struct device *dev)
146{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800147 struct platform_object *pa = container_of(dev, struct platform_object,
148 pdev.dev);
Russell King37c12e72005-11-05 21:19:33 +0000149
150 kfree(pa->pdev.dev.platform_data);
151 kfree(pa->pdev.resource);
152 kfree(pa);
153}
154
155/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000156 * platform_device_alloc - create a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800157 * @name: base name of the device we're adding
158 * @id: instance id
Russell King37c12e72005-11-05 21:19:33 +0000159 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800160 * Create a platform device object which can have other objects attached
161 * to it, and which will have attached objects freed when it is released.
Russell King37c12e72005-11-05 21:19:33 +0000162 */
Jean Delvare1359555e2007-09-09 12:54:16 +0200163struct platform_device *platform_device_alloc(const char *name, int id)
Russell King37c12e72005-11-05 21:19:33 +0000164{
165 struct platform_object *pa;
166
167 pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
168 if (pa) {
169 strcpy(pa->name, name);
170 pa->pdev.name = pa->name;
171 pa->pdev.id = id;
172 device_initialize(&pa->pdev.dev);
173 pa->pdev.dev.release = platform_device_release;
174 }
175
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500176 return pa ? &pa->pdev : NULL;
Russell King37c12e72005-11-05 21:19:33 +0000177}
178EXPORT_SYMBOL_GPL(platform_device_alloc);
179
180/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000181 * platform_device_add_resources - add resources to a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800182 * @pdev: platform device allocated by platform_device_alloc to add resources to
183 * @res: set of resources that needs to be allocated for the device
184 * @num: number of resources
Russell King37c12e72005-11-05 21:19:33 +0000185 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800186 * Add a copy of the resources to the platform device. The memory
187 * associated with the resources will be freed when the platform device is
188 * released.
Russell King37c12e72005-11-05 21:19:33 +0000189 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800190int platform_device_add_resources(struct platform_device *pdev,
Geert Uytterhoeven0b7f1a72009-01-28 21:01:02 +0100191 const struct resource *res, unsigned int num)
Russell King37c12e72005-11-05 21:19:33 +0000192{
193 struct resource *r;
194
Uwe Kleine-König3e61dfd2010-06-15 10:47:55 +0200195 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
Russell King37c12e72005-11-05 21:19:33 +0000196 if (r) {
Russell King37c12e72005-11-05 21:19:33 +0000197 pdev->resource = r;
198 pdev->num_resources = num;
Uwe Kleine-König3e61dfd2010-06-15 10:47:55 +0200199 return 0;
Russell King37c12e72005-11-05 21:19:33 +0000200 }
Uwe Kleine-König3e61dfd2010-06-15 10:47:55 +0200201 return -ENOMEM;
Russell King37c12e72005-11-05 21:19:33 +0000202}
203EXPORT_SYMBOL_GPL(platform_device_add_resources);
204
205/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000206 * platform_device_add_data - add platform-specific data to a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800207 * @pdev: platform device allocated by platform_device_alloc to add resources to
208 * @data: platform specific data for this platform device
209 * @size: size of platform specific data
Russell King37c12e72005-11-05 21:19:33 +0000210 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800211 * Add a copy of platform specific data to the platform device's
212 * platform_data pointer. The memory associated with the platform data
213 * will be freed when the platform device is released.
Russell King37c12e72005-11-05 21:19:33 +0000214 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800215int platform_device_add_data(struct platform_device *pdev, const void *data,
216 size_t size)
Russell King37c12e72005-11-05 21:19:33 +0000217{
Andrew Mortondaa41222009-08-06 16:00:44 -0700218 void *d = kmemdup(data, size, GFP_KERNEL);
Russell King37c12e72005-11-05 21:19:33 +0000219
Russell King37c12e72005-11-05 21:19:33 +0000220 if (d) {
Russell King37c12e72005-11-05 21:19:33 +0000221 pdev->dev.platform_data = d;
Andrew Mortondaa41222009-08-06 16:00:44 -0700222 return 0;
Russell King37c12e72005-11-05 21:19:33 +0000223 }
Andrew Mortondaa41222009-08-06 16:00:44 -0700224 return -ENOMEM;
Russell King37c12e72005-11-05 21:19:33 +0000225}
226EXPORT_SYMBOL_GPL(platform_device_add_data);
227
228/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800229 * platform_device_add - add a platform device to device hierarchy
230 * @pdev: platform device we're adding
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800232 * This is part 2 of platform_device_register(), though may be called
233 * separately _iff_ pdev was allocated by platform_device_alloc().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 */
Russell King37c12e72005-11-05 21:19:33 +0000235int platform_device_add(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236{
237 int i, ret = 0;
238
239 if (!pdev)
240 return -EINVAL;
241
242 if (!pdev->dev.parent)
243 pdev->dev.parent = &platform_bus;
244
245 pdev->dev.bus = &platform_bus_type;
246
247 if (pdev->id != -1)
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100248 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 else
Greg Kroah-Hartmanacc0e902009-06-02 15:39:55 -0700250 dev_set_name(&pdev->dev, "%s", pdev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
252 for (i = 0; i < pdev->num_resources; i++) {
253 struct resource *p, *r = &pdev->resource[i];
254
255 if (r->name == NULL)
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100256 r->name = dev_name(&pdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258 p = r->parent;
259 if (!p) {
Magnus Dammc9f66162008-10-15 22:05:15 -0700260 if (resource_type(r) == IORESOURCE_MEM)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 p = &iomem_resource;
Magnus Dammc9f66162008-10-15 22:05:15 -0700262 else if (resource_type(r) == IORESOURCE_IO)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 p = &ioport_resource;
264 }
265
Kumar Galad960bb42005-11-28 10:15:39 -0600266 if (p && insert_resource(p, r)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 printk(KERN_ERR
268 "%s: failed to claim resource %d\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100269 dev_name(&pdev->dev), i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 ret = -EBUSY;
271 goto failed;
272 }
273 }
274
275 pr_debug("Registering platform device '%s'. Parent at %s\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100276 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
Russell Kinge3915532006-05-06 08:15:26 +0100278 ret = device_add(&pdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 if (ret == 0)
280 return ret;
281
282 failed:
Magnus Dammc9f66162008-10-15 22:05:15 -0700283 while (--i >= 0) {
284 struct resource *r = &pdev->resource[i];
285 unsigned long type = resource_type(r);
286
287 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
288 release_resource(r);
289 }
290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 return ret;
292}
Russell King37c12e72005-11-05 21:19:33 +0000293EXPORT_SYMBOL_GPL(platform_device_add);
294
295/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800296 * platform_device_del - remove a platform-level device
297 * @pdev: platform device we're removing
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500298 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800299 * Note that this function will also release all memory- and port-based
300 * resources owned by the device (@dev->resource). This function must
301 * _only_ be externally called in error cases. All other usage is a bug.
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500302 */
303void platform_device_del(struct platform_device *pdev)
304{
305 int i;
306
307 if (pdev) {
Jean Delvaredc4c15d2007-05-02 20:55:54 +0200308 device_del(&pdev->dev);
309
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500310 for (i = 0; i < pdev->num_resources; i++) {
311 struct resource *r = &pdev->resource[i];
Magnus Dammc9f66162008-10-15 22:05:15 -0700312 unsigned long type = resource_type(r);
313
314 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500315 release_resource(r);
316 }
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500317 }
318}
319EXPORT_SYMBOL_GPL(platform_device_del);
320
321/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800322 * platform_device_register - add a platform-level device
323 * @pdev: platform device we're adding
Russell King37c12e72005-11-05 21:19:33 +0000324 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800325int platform_device_register(struct platform_device *pdev)
Russell King37c12e72005-11-05 21:19:33 +0000326{
327 device_initialize(&pdev->dev);
328 return platform_device_add(pdev);
329}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500330EXPORT_SYMBOL_GPL(platform_device_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
332/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800333 * platform_device_unregister - unregister a platform-level device
334 * @pdev: platform device we're unregistering
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800336 * Unregistration is done in 2 steps. First we release all resources
337 * and remove it from the subsystem, then we drop reference count by
338 * calling platform_device_put().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800340void platform_device_unregister(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341{
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500342 platform_device_del(pdev);
343 platform_device_put(pdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500345EXPORT_SYMBOL_GPL(platform_device_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347/**
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200348 * platform_device_register_resndata - add a platform-level device with
349 * resources and platform-specific data
350 *
351 * @parent: parent device for the device we're adding
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800352 * @name: base name of the device we're adding
353 * @id: instance id
354 * @res: set of resources that needs to be allocated for the device
355 * @num: number of resources
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700356 * @data: platform specific data for this platform device
357 * @size: size of platform specific data
358 *
Jani Nikulaf0eae0e2010-03-11 18:11:45 +0200359 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700360 */
Uwe Kleine-König737a3bb2010-06-21 16:11:45 +0200361struct platform_device *__init_or_module platform_device_register_resndata(
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700362 struct device *parent,
363 const char *name, int id,
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200364 const struct resource *res, unsigned int num,
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700365 const void *data, size_t size)
366{
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200367 int ret = -ENOMEM;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700368 struct platform_device *pdev;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700369
370 pdev = platform_device_alloc(name, id);
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200371 if (!pdev)
372 goto err;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700373
374 pdev->dev.parent = parent;
375
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200376 if (res) {
377 ret = platform_device_add_resources(pdev, res, num);
378 if (ret)
379 goto err;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700380 }
381
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200382 if (data) {
383 ret = platform_device_add_data(pdev, data, size);
384 if (ret)
385 goto err;
386 }
387
388 ret = platform_device_add(pdev);
389 if (ret) {
390err:
391 platform_device_put(pdev);
392 return ERR_PTR(ret);
393 }
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700394
395 return pdev;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700396}
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200397EXPORT_SYMBOL_GPL(platform_device_register_resndata);
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700398
Russell King00d3dcd2005-11-09 17:23:39 +0000399static int platform_drv_probe(struct device *_dev)
400{
401 struct platform_driver *drv = to_platform_driver(_dev->driver);
402 struct platform_device *dev = to_platform_device(_dev);
403
404 return drv->probe(dev);
405}
406
David Brownellc67334f2006-11-16 23:28:47 -0800407static int platform_drv_probe_fail(struct device *_dev)
408{
409 return -ENXIO;
410}
411
Russell King00d3dcd2005-11-09 17:23:39 +0000412static int platform_drv_remove(struct device *_dev)
413{
414 struct platform_driver *drv = to_platform_driver(_dev->driver);
415 struct platform_device *dev = to_platform_device(_dev);
416
417 return drv->remove(dev);
418}
419
420static void platform_drv_shutdown(struct device *_dev)
421{
422 struct platform_driver *drv = to_platform_driver(_dev->driver);
423 struct platform_device *dev = to_platform_device(_dev);
424
425 drv->shutdown(dev);
426}
427
Russell King00d3dcd2005-11-09 17:23:39 +0000428/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000429 * platform_driver_register - register a driver for platform-level devices
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800430 * @drv: platform driver structure
Russell King00d3dcd2005-11-09 17:23:39 +0000431 */
432int platform_driver_register(struct platform_driver *drv)
433{
434 drv->driver.bus = &platform_bus_type;
435 if (drv->probe)
436 drv->driver.probe = platform_drv_probe;
437 if (drv->remove)
438 drv->driver.remove = platform_drv_remove;
439 if (drv->shutdown)
440 drv->driver.shutdown = platform_drv_shutdown;
Magnus Damm783ea7d2009-06-04 22:13:33 +0200441
Russell King00d3dcd2005-11-09 17:23:39 +0000442 return driver_register(&drv->driver);
443}
444EXPORT_SYMBOL_GPL(platform_driver_register);
445
446/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000447 * platform_driver_unregister - unregister a driver for platform-level devices
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800448 * @drv: platform driver structure
Russell King00d3dcd2005-11-09 17:23:39 +0000449 */
450void platform_driver_unregister(struct platform_driver *drv)
451{
452 driver_unregister(&drv->driver);
453}
454EXPORT_SYMBOL_GPL(platform_driver_unregister);
455
David Brownellc67334f2006-11-16 23:28:47 -0800456/**
457 * platform_driver_probe - register driver for non-hotpluggable device
458 * @drv: platform driver structure
459 * @probe: the driver probe routine, probably from an __init section
460 *
461 * Use this instead of platform_driver_register() when you know the device
462 * is not hotpluggable and has already been registered, and you want to
463 * remove its run-once probe() infrastructure from memory after the driver
464 * has bound to the device.
465 *
466 * One typical use for this would be with drivers for controllers integrated
467 * into system-on-chip processors, where the controller devices have been
468 * configured as part of board setup.
469 *
470 * Returns zero if the driver registered and bound to a device, else returns
471 * a negative error code and with the driver not registered.
472 */
Andrew Mortonc63e0782006-12-04 14:56:36 -0800473int __init_or_module platform_driver_probe(struct platform_driver *drv,
David Brownellc67334f2006-11-16 23:28:47 -0800474 int (*probe)(struct platform_device *))
475{
476 int retval, code;
477
Dmitry Torokhov1a6f2a72009-10-12 20:17:41 -0700478 /* make sure driver won't have bind/unbind attributes */
479 drv->driver.suppress_bind_attrs = true;
480
David Brownellc67334f2006-11-16 23:28:47 -0800481 /* temporary section violation during probe() */
482 drv->probe = probe;
483 retval = code = platform_driver_register(drv);
484
Dmitry Torokhov1a6f2a72009-10-12 20:17:41 -0700485 /*
486 * Fixup that section violation, being paranoid about code scanning
David Brownellc67334f2006-11-16 23:28:47 -0800487 * the list of drivers in order to probe new devices. Check to see
488 * if the probe was successful, and make sure any forced probes of
489 * new devices fail.
490 */
Greg Kroah-Hartmanc6f7e722007-11-01 19:41:16 -0700491 spin_lock(&platform_bus_type.p->klist_drivers.k_lock);
David Brownellc67334f2006-11-16 23:28:47 -0800492 drv->probe = NULL;
Greg Kroah-Hartmane5dd1272007-11-28 15:59:15 -0800493 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
David Brownellc67334f2006-11-16 23:28:47 -0800494 retval = -ENODEV;
495 drv->driver.probe = platform_drv_probe_fail;
Greg Kroah-Hartmanc6f7e722007-11-01 19:41:16 -0700496 spin_unlock(&platform_bus_type.p->klist_drivers.k_lock);
David Brownellc67334f2006-11-16 23:28:47 -0800497
498 if (code != retval)
499 platform_driver_unregister(drv);
500 return retval;
501}
502EXPORT_SYMBOL_GPL(platform_driver_probe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800504/**
505 * platform_create_bundle - register driver and create corresponding device
506 * @driver: platform driver structure
507 * @probe: the driver probe routine, probably from an __init section
508 * @res: set of resources that needs to be allocated for the device
509 * @n_res: number of resources
510 * @data: platform specific data for this platform device
511 * @size: size of platform specific data
512 *
513 * Use this in legacy-style modules that probe hardware directly and
514 * register a single platform device and corresponding platform driver.
Jani Nikulaf0eae0e2010-03-11 18:11:45 +0200515 *
516 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800517 */
518struct platform_device * __init_or_module platform_create_bundle(
519 struct platform_driver *driver,
520 int (*probe)(struct platform_device *),
521 struct resource *res, unsigned int n_res,
522 const void *data, size_t size)
523{
524 struct platform_device *pdev;
525 int error;
526
527 pdev = platform_device_alloc(driver->driver.name, -1);
528 if (!pdev) {
529 error = -ENOMEM;
530 goto err_out;
531 }
532
533 if (res) {
534 error = platform_device_add_resources(pdev, res, n_res);
535 if (error)
536 goto err_pdev_put;
537 }
538
539 if (data) {
540 error = platform_device_add_data(pdev, data, size);
541 if (error)
542 goto err_pdev_put;
543 }
544
545 error = platform_device_add(pdev);
546 if (error)
547 goto err_pdev_put;
548
549 error = platform_driver_probe(driver, probe);
550 if (error)
551 goto err_pdev_del;
552
553 return pdev;
554
555err_pdev_del:
556 platform_device_del(pdev);
557err_pdev_put:
558 platform_device_put(pdev);
559err_out:
560 return ERR_PTR(error);
561}
562EXPORT_SYMBOL_GPL(platform_create_bundle);
563
David Brownella0245f72006-05-29 10:37:33 -0700564/* modalias support enables more hands-off userspace setup:
565 * (a) environment variable lets new-style hotplug events work once system is
566 * fully running: "modprobe $MODALIAS"
567 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
568 * mishandled before system is fully running: "modprobe $(cat modalias)"
569 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800570static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
571 char *buf)
David Brownella0245f72006-05-29 10:37:33 -0700572{
573 struct platform_device *pdev = to_platform_device(dev);
Kay Sievers43cc71e2007-08-18 04:40:39 +0200574 int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
David Brownella0245f72006-05-29 10:37:33 -0700575
576 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
577}
578
579static struct device_attribute platform_dev_attrs[] = {
580 __ATTR_RO(modalias),
581 __ATTR_NULL,
582};
583
Kay Sievers7eff2e72007-08-14 15:15:12 +0200584static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
David Brownella0245f72006-05-29 10:37:33 -0700585{
586 struct platform_device *pdev = to_platform_device(dev);
Grant Likelyeca39302010-06-08 07:48:21 -0600587 int rc;
588
589 /* Some devices have extra OF data and an OF-style MODALIAS */
590 rc = of_device_uevent(dev,env);
591 if (rc != -ENODEV)
592 return rc;
David Brownella0245f72006-05-29 10:37:33 -0700593
Eric Miao57fee4a2009-02-04 11:52:40 +0800594 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
595 (pdev->id_entry) ? pdev->id_entry->name : pdev->name);
David Brownella0245f72006-05-29 10:37:33 -0700596 return 0;
597}
598
Eric Miao57fee4a2009-02-04 11:52:40 +0800599static const struct platform_device_id *platform_match_id(
Uwe Kleine-König831fad22010-01-26 09:35:00 +0100600 const struct platform_device_id *id,
Eric Miao57fee4a2009-02-04 11:52:40 +0800601 struct platform_device *pdev)
602{
603 while (id->name[0]) {
604 if (strcmp(pdev->name, id->name) == 0) {
605 pdev->id_entry = id;
606 return id;
607 }
608 id++;
609 }
610 return NULL;
611}
612
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800614 * platform_match - bind platform device to platform driver.
615 * @dev: device.
616 * @drv: driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800618 * Platform device IDs are assumed to be encoded like this:
619 * "<name><instance>", where <name> is a short description of the type of
620 * device, like "pci" or "floppy", and <instance> is the enumerated
621 * instance of the device, like '0' or '42'. Driver IDs are simply
622 * "<name>". So, extract the <name> from the platform_device structure,
623 * and compare it against the name of the driver. Return whether they match
624 * or not.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800626static int platform_match(struct device *dev, struct device_driver *drv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627{
Eric Miao71b3e0c2009-01-31 22:47:44 +0800628 struct platform_device *pdev = to_platform_device(dev);
Eric Miao57fee4a2009-02-04 11:52:40 +0800629 struct platform_driver *pdrv = to_platform_driver(drv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630
Grant Likely05212152010-06-08 07:48:20 -0600631 /* Attempt an OF style match first */
632 if (of_driver_match_device(dev, drv))
633 return 1;
634
635 /* Then try to match against the id table */
Eric Miao57fee4a2009-02-04 11:52:40 +0800636 if (pdrv->id_table)
637 return platform_match_id(pdrv->id_table, pdev) != NULL;
638
639 /* fall-back to driver name match */
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100640 return (strcmp(pdev->name, drv->name) == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641}
642
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200643#ifdef CONFIG_PM_SLEEP
644
645static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646{
Magnus Damm783ea7d2009-06-04 22:13:33 +0200647 struct platform_driver *pdrv = to_platform_driver(dev->driver);
648 struct platform_device *pdev = to_platform_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 int ret = 0;
650
Magnus Damm783ea7d2009-06-04 22:13:33 +0200651 if (dev->driver && pdrv->suspend)
652 ret = pdrv->suspend(pdev, mesg);
David Brownell386415d2006-09-03 13:16:45 -0700653
654 return ret;
655}
656
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200657static int platform_legacy_resume(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658{
Magnus Damm783ea7d2009-06-04 22:13:33 +0200659 struct platform_driver *pdrv = to_platform_driver(dev->driver);
660 struct platform_device *pdev = to_platform_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 int ret = 0;
662
Magnus Damm783ea7d2009-06-04 22:13:33 +0200663 if (dev->driver && pdrv->resume)
664 ret = pdrv->resume(pdev);
Russell King9480e302005-10-28 09:52:56 -0700665
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 return ret;
667}
668
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200669static int platform_pm_prepare(struct device *dev)
670{
671 struct device_driver *drv = dev->driver;
672 int ret = 0;
673
674 if (drv && drv->pm && drv->pm->prepare)
675 ret = drv->pm->prepare(dev);
676
677 return ret;
678}
679
680static void platform_pm_complete(struct device *dev)
681{
682 struct device_driver *drv = dev->driver;
683
684 if (drv && drv->pm && drv->pm->complete)
685 drv->pm->complete(dev);
686}
687
Magnus Damm9d730222009-08-20 20:25:32 +0200688#else /* !CONFIG_PM_SLEEP */
689
690#define platform_pm_prepare NULL
691#define platform_pm_complete NULL
692
693#endif /* !CONFIG_PM_SLEEP */
694
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200695#ifdef CONFIG_SUSPEND
696
Kevin Hilman190e8372010-03-17 16:18:15 -0700697int __weak platform_pm_suspend(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200698{
699 struct device_driver *drv = dev->driver;
700 int ret = 0;
701
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200702 if (!drv)
703 return 0;
704
705 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200706 if (drv->pm->suspend)
707 ret = drv->pm->suspend(dev);
708 } else {
709 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
710 }
711
712 return ret;
713}
714
Kevin Hilman190e8372010-03-17 16:18:15 -0700715int __weak platform_pm_suspend_noirq(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200716{
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200717 struct device_driver *drv = dev->driver;
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200718 int ret = 0;
719
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200720 if (!drv)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200721 return 0;
722
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200723 if (drv->pm) {
724 if (drv->pm->suspend_noirq)
725 ret = drv->pm->suspend_noirq(dev);
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200726 }
727
728 return ret;
729}
730
Kevin Hilman190e8372010-03-17 16:18:15 -0700731int __weak platform_pm_resume(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200732{
733 struct device_driver *drv = dev->driver;
734 int ret = 0;
735
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200736 if (!drv)
737 return 0;
738
739 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200740 if (drv->pm->resume)
741 ret = drv->pm->resume(dev);
742 } else {
743 ret = platform_legacy_resume(dev);
744 }
745
746 return ret;
747}
748
Kevin Hilman190e8372010-03-17 16:18:15 -0700749int __weak platform_pm_resume_noirq(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200750{
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200751 struct device_driver *drv = dev->driver;
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200752 int ret = 0;
753
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200754 if (!drv)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200755 return 0;
756
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200757 if (drv->pm) {
758 if (drv->pm->resume_noirq)
759 ret = drv->pm->resume_noirq(dev);
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200760 }
761
762 return ret;
763}
764
765#else /* !CONFIG_SUSPEND */
766
767#define platform_pm_suspend NULL
768#define platform_pm_resume NULL
769#define platform_pm_suspend_noirq NULL
770#define platform_pm_resume_noirq NULL
771
772#endif /* !CONFIG_SUSPEND */
773
774#ifdef CONFIG_HIBERNATION
775
776static int platform_pm_freeze(struct device *dev)
777{
778 struct device_driver *drv = dev->driver;
779 int ret = 0;
780
781 if (!drv)
782 return 0;
783
784 if (drv->pm) {
785 if (drv->pm->freeze)
786 ret = drv->pm->freeze(dev);
787 } else {
788 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
789 }
790
791 return ret;
792}
793
794static int platform_pm_freeze_noirq(struct device *dev)
795{
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200796 struct device_driver *drv = dev->driver;
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200797 int ret = 0;
798
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200799 if (!drv)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200800 return 0;
801
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200802 if (drv->pm) {
803 if (drv->pm->freeze_noirq)
804 ret = drv->pm->freeze_noirq(dev);
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200805 }
806
807 return ret;
808}
809
810static int platform_pm_thaw(struct device *dev)
811{
812 struct device_driver *drv = dev->driver;
813 int ret = 0;
814
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200815 if (!drv)
816 return 0;
817
818 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200819 if (drv->pm->thaw)
820 ret = drv->pm->thaw(dev);
821 } else {
822 ret = platform_legacy_resume(dev);
823 }
824
825 return ret;
826}
827
828static int platform_pm_thaw_noirq(struct device *dev)
829{
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200830 struct device_driver *drv = dev->driver;
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200831 int ret = 0;
832
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200833 if (!drv)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200834 return 0;
835
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200836 if (drv->pm) {
837 if (drv->pm->thaw_noirq)
838 ret = drv->pm->thaw_noirq(dev);
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200839 }
840
841 return ret;
842}
843
844static int platform_pm_poweroff(struct device *dev)
845{
846 struct device_driver *drv = dev->driver;
847 int ret = 0;
848
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200849 if (!drv)
850 return 0;
851
852 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200853 if (drv->pm->poweroff)
854 ret = drv->pm->poweroff(dev);
855 } else {
856 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
857 }
858
859 return ret;
860}
861
862static int platform_pm_poweroff_noirq(struct device *dev)
863{
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200864 struct device_driver *drv = dev->driver;
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200865 int ret = 0;
866
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200867 if (!drv)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200868 return 0;
869
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200870 if (drv->pm) {
871 if (drv->pm->poweroff_noirq)
872 ret = drv->pm->poweroff_noirq(dev);
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200873 }
874
875 return ret;
876}
877
878static int platform_pm_restore(struct device *dev)
879{
880 struct device_driver *drv = dev->driver;
881 int ret = 0;
882
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200883 if (!drv)
884 return 0;
885
886 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200887 if (drv->pm->restore)
888 ret = drv->pm->restore(dev);
889 } else {
890 ret = platform_legacy_resume(dev);
891 }
892
893 return ret;
894}
895
896static int platform_pm_restore_noirq(struct device *dev)
897{
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200898 struct device_driver *drv = dev->driver;
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200899 int ret = 0;
900
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200901 if (!drv)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200902 return 0;
903
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200904 if (drv->pm) {
905 if (drv->pm->restore_noirq)
906 ret = drv->pm->restore_noirq(dev);
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200907 }
908
909 return ret;
910}
911
912#else /* !CONFIG_HIBERNATION */
913
914#define platform_pm_freeze NULL
915#define platform_pm_thaw NULL
916#define platform_pm_poweroff NULL
917#define platform_pm_restore NULL
918#define platform_pm_freeze_noirq NULL
919#define platform_pm_thaw_noirq NULL
920#define platform_pm_poweroff_noirq NULL
921#define platform_pm_restore_noirq NULL
922
923#endif /* !CONFIG_HIBERNATION */
924
Magnus Damm9d730222009-08-20 20:25:32 +0200925#ifdef CONFIG_PM_RUNTIME
926
927int __weak platform_pm_runtime_suspend(struct device *dev)
928{
Mark Brown543f25032010-05-10 23:10:13 +0200929 return pm_generic_runtime_suspend(dev);
Magnus Damm9d730222009-08-20 20:25:32 +0200930};
931
932int __weak platform_pm_runtime_resume(struct device *dev)
933{
Mark Brown543f25032010-05-10 23:10:13 +0200934 return pm_generic_runtime_resume(dev);
Magnus Damm9d730222009-08-20 20:25:32 +0200935};
936
937int __weak platform_pm_runtime_idle(struct device *dev)
938{
Mark Brown543f25032010-05-10 23:10:13 +0200939 return pm_generic_runtime_idle(dev);
Magnus Damm9d730222009-08-20 20:25:32 +0200940};
941
942#else /* !CONFIG_PM_RUNTIME */
943
944#define platform_pm_runtime_suspend NULL
945#define platform_pm_runtime_resume NULL
946#define platform_pm_runtime_idle NULL
947
948#endif /* !CONFIG_PM_RUNTIME */
949
Dmitry Torokhovd9ab7712009-07-22 00:37:25 +0200950static const struct dev_pm_ops platform_dev_pm_ops = {
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200951 .prepare = platform_pm_prepare,
952 .complete = platform_pm_complete,
953 .suspend = platform_pm_suspend,
954 .resume = platform_pm_resume,
955 .freeze = platform_pm_freeze,
956 .thaw = platform_pm_thaw,
957 .poweroff = platform_pm_poweroff,
958 .restore = platform_pm_restore,
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200959 .suspend_noirq = platform_pm_suspend_noirq,
960 .resume_noirq = platform_pm_resume_noirq,
961 .freeze_noirq = platform_pm_freeze_noirq,
962 .thaw_noirq = platform_pm_thaw_noirq,
963 .poweroff_noirq = platform_pm_poweroff_noirq,
964 .restore_noirq = platform_pm_restore_noirq,
Magnus Damm9d730222009-08-20 20:25:32 +0200965 .runtime_suspend = platform_pm_runtime_suspend,
966 .runtime_resume = platform_pm_runtime_resume,
967 .runtime_idle = platform_pm_runtime_idle,
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200968};
969
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970struct bus_type platform_bus_type = {
971 .name = "platform",
David Brownella0245f72006-05-29 10:37:33 -0700972 .dev_attrs = platform_dev_attrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 .match = platform_match,
David Brownella0245f72006-05-29 10:37:33 -0700974 .uevent = platform_uevent,
Magnus Damm9d730222009-08-20 20:25:32 +0200975 .pm = &platform_dev_pm_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976};
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500977EXPORT_SYMBOL_GPL(platform_bus_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978
979int __init platform_bus_init(void)
980{
Cornelia Huckfbfb1442006-11-27 10:35:08 +0100981 int error;
982
Magnus Damm13977092009-03-30 14:37:25 -0700983 early_platform_cleanup();
984
Cornelia Huckfbfb1442006-11-27 10:35:08 +0100985 error = device_register(&platform_bus);
986 if (error)
987 return error;
988 error = bus_register(&platform_bus_type);
989 if (error)
990 device_unregister(&platform_bus);
991 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992}
993
994#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
995u64 dma_get_required_mask(struct device *dev)
996{
997 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
998 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
999 u64 mask;
1000
1001 if (!high_totalram) {
1002 /* convert to mask just covering totalram */
1003 low_totalram = (1 << (fls(low_totalram) - 1));
1004 low_totalram += low_totalram - 1;
1005 mask = low_totalram;
1006 } else {
1007 high_totalram = (1 << (fls(high_totalram) - 1));
1008 high_totalram += high_totalram - 1;
1009 mask = (((u64)high_totalram) << 32) + 0xffffffff;
1010 }
James Bottomleye88a0c22008-03-09 11:57:56 -05001011 return mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012}
1013EXPORT_SYMBOL_GPL(dma_get_required_mask);
1014#endif
Magnus Damm13977092009-03-30 14:37:25 -07001015
1016static __initdata LIST_HEAD(early_platform_driver_list);
1017static __initdata LIST_HEAD(early_platform_device_list);
1018
1019/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001020 * early_platform_driver_register - register early platform driver
Randy Dunlapd86c1302009-04-21 07:22:53 -07001021 * @epdrv: early_platform driver structure
Magnus Damm13977092009-03-30 14:37:25 -07001022 * @buf: string passed from early_param()
Magnus Damm4d26e1392010-03-10 20:50:38 +09001023 *
1024 * Helper function for early_platform_init() / early_platform_init_buffer()
Magnus Damm13977092009-03-30 14:37:25 -07001025 */
1026int __init early_platform_driver_register(struct early_platform_driver *epdrv,
1027 char *buf)
1028{
Magnus Dammc60e0502009-11-27 17:38:51 +09001029 char *tmp;
Magnus Damm13977092009-03-30 14:37:25 -07001030 int n;
1031
1032 /* Simply add the driver to the end of the global list.
1033 * Drivers will by default be put on the list in compiled-in order.
1034 */
1035 if (!epdrv->list.next) {
1036 INIT_LIST_HEAD(&epdrv->list);
1037 list_add_tail(&epdrv->list, &early_platform_driver_list);
1038 }
1039
1040 /* If the user has specified device then make sure the driver
1041 * gets prioritized. The driver of the last device specified on
1042 * command line will be put first on the list.
1043 */
1044 n = strlen(epdrv->pdrv->driver.name);
1045 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1046 list_move(&epdrv->list, &early_platform_driver_list);
1047
Magnus Dammc60e0502009-11-27 17:38:51 +09001048 /* Allow passing parameters after device name */
1049 if (buf[n] == '\0' || buf[n] == ',')
Magnus Damm13977092009-03-30 14:37:25 -07001050 epdrv->requested_id = -1;
Magnus Dammc60e0502009-11-27 17:38:51 +09001051 else {
1052 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1053 &tmp, 10);
1054
1055 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1056 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1057 n = 0;
1058 } else
1059 n += strcspn(&buf[n + 1], ",") + 1;
1060 }
1061
1062 if (buf[n] == ',')
1063 n++;
1064
1065 if (epdrv->bufsize) {
1066 memcpy(epdrv->buffer, &buf[n],
1067 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1068 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1069 }
Magnus Damm13977092009-03-30 14:37:25 -07001070 }
1071
1072 return 0;
1073}
1074
1075/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001076 * early_platform_add_devices - adds a number of early platform devices
Magnus Damm13977092009-03-30 14:37:25 -07001077 * @devs: array of early platform devices to add
1078 * @num: number of early platform devices in array
Magnus Damm4d26e1392010-03-10 20:50:38 +09001079 *
1080 * Used by early architecture code to register early platform devices and
1081 * their platform data.
Magnus Damm13977092009-03-30 14:37:25 -07001082 */
1083void __init early_platform_add_devices(struct platform_device **devs, int num)
1084{
1085 struct device *dev;
1086 int i;
1087
1088 /* simply add the devices to list */
1089 for (i = 0; i < num; i++) {
1090 dev = &devs[i]->dev;
1091
1092 if (!dev->devres_head.next) {
1093 INIT_LIST_HEAD(&dev->devres_head);
1094 list_add_tail(&dev->devres_head,
1095 &early_platform_device_list);
1096 }
1097 }
1098}
1099
1100/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001101 * early_platform_driver_register_all - register early platform drivers
Magnus Damm13977092009-03-30 14:37:25 -07001102 * @class_str: string to identify early platform driver class
Magnus Damm4d26e1392010-03-10 20:50:38 +09001103 *
1104 * Used by architecture code to register all early platform drivers
1105 * for a certain class. If omitted then only early platform drivers
1106 * with matching kernel command line class parameters will be registered.
Magnus Damm13977092009-03-30 14:37:25 -07001107 */
1108void __init early_platform_driver_register_all(char *class_str)
1109{
1110 /* The "class_str" parameter may or may not be present on the kernel
1111 * command line. If it is present then there may be more than one
1112 * matching parameter.
1113 *
1114 * Since we register our early platform drivers using early_param()
1115 * we need to make sure that they also get registered in the case
1116 * when the parameter is missing from the kernel command line.
1117 *
1118 * We use parse_early_options() to make sure the early_param() gets
1119 * called at least once. The early_param() may be called more than
1120 * once since the name of the preferred device may be specified on
1121 * the kernel command line. early_platform_driver_register() handles
1122 * this case for us.
1123 */
1124 parse_early_options(class_str);
1125}
1126
1127/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001128 * early_platform_match - find early platform device matching driver
Randy Dunlapd86c1302009-04-21 07:22:53 -07001129 * @epdrv: early platform driver structure
Magnus Damm13977092009-03-30 14:37:25 -07001130 * @id: id to match against
1131 */
1132static __init struct platform_device *
1133early_platform_match(struct early_platform_driver *epdrv, int id)
1134{
1135 struct platform_device *pd;
1136
1137 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1138 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1139 if (pd->id == id)
1140 return pd;
1141
1142 return NULL;
1143}
1144
1145/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001146 * early_platform_left - check if early platform driver has matching devices
Randy Dunlapd86c1302009-04-21 07:22:53 -07001147 * @epdrv: early platform driver structure
Magnus Damm13977092009-03-30 14:37:25 -07001148 * @id: return true if id or above exists
1149 */
1150static __init int early_platform_left(struct early_platform_driver *epdrv,
1151 int id)
1152{
1153 struct platform_device *pd;
1154
1155 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1156 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1157 if (pd->id >= id)
1158 return 1;
1159
1160 return 0;
1161}
1162
1163/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001164 * early_platform_driver_probe_id - probe drivers matching class_str and id
Magnus Damm13977092009-03-30 14:37:25 -07001165 * @class_str: string to identify early platform driver class
1166 * @id: id to match against
1167 * @nr_probe: number of platform devices to successfully probe before exiting
1168 */
1169static int __init early_platform_driver_probe_id(char *class_str,
1170 int id,
1171 int nr_probe)
1172{
1173 struct early_platform_driver *epdrv;
1174 struct platform_device *match;
1175 int match_id;
1176 int n = 0;
1177 int left = 0;
1178
1179 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1180 /* only use drivers matching our class_str */
1181 if (strcmp(class_str, epdrv->class_str))
1182 continue;
1183
1184 if (id == -2) {
1185 match_id = epdrv->requested_id;
1186 left = 1;
1187
1188 } else {
1189 match_id = id;
1190 left += early_platform_left(epdrv, id);
1191
1192 /* skip requested id */
1193 switch (epdrv->requested_id) {
1194 case EARLY_PLATFORM_ID_ERROR:
1195 case EARLY_PLATFORM_ID_UNSET:
1196 break;
1197 default:
1198 if (epdrv->requested_id == id)
1199 match_id = EARLY_PLATFORM_ID_UNSET;
1200 }
1201 }
1202
1203 switch (match_id) {
1204 case EARLY_PLATFORM_ID_ERROR:
1205 pr_warning("%s: unable to parse %s parameter\n",
1206 class_str, epdrv->pdrv->driver.name);
1207 /* fall-through */
1208 case EARLY_PLATFORM_ID_UNSET:
1209 match = NULL;
1210 break;
1211 default:
1212 match = early_platform_match(epdrv, match_id);
1213 }
1214
1215 if (match) {
Paul Mundta636ee72010-03-09 06:57:53 +00001216 /*
1217 * Set up a sensible init_name to enable
1218 * dev_name() and others to be used before the
1219 * rest of the driver core is initialized.
1220 */
Paul Mundt06fe53b2010-05-13 17:56:56 +09001221 if (!match->dev.init_name && slab_is_available()) {
Paul Mundta636ee72010-03-09 06:57:53 +00001222 if (match->id != -1)
Paul Mundtbd050862010-03-29 15:51:35 +09001223 match->dev.init_name =
1224 kasprintf(GFP_KERNEL, "%s.%d",
1225 match->name,
1226 match->id);
Paul Mundta636ee72010-03-09 06:57:53 +00001227 else
Paul Mundtbd050862010-03-29 15:51:35 +09001228 match->dev.init_name =
1229 kasprintf(GFP_KERNEL, "%s",
1230 match->name);
Paul Mundta636ee72010-03-09 06:57:53 +00001231
Paul Mundta636ee72010-03-09 06:57:53 +00001232 if (!match->dev.init_name)
1233 return -ENOMEM;
1234 }
Paul Mundtbd050862010-03-29 15:51:35 +09001235
Magnus Damm13977092009-03-30 14:37:25 -07001236 if (epdrv->pdrv->probe(match))
1237 pr_warning("%s: unable to probe %s early.\n",
1238 class_str, match->name);
1239 else
1240 n++;
1241 }
1242
1243 if (n >= nr_probe)
1244 break;
1245 }
1246
1247 if (left)
1248 return n;
1249 else
1250 return -ENODEV;
1251}
1252
1253/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001254 * early_platform_driver_probe - probe a class of registered drivers
Magnus Damm13977092009-03-30 14:37:25 -07001255 * @class_str: string to identify early platform driver class
1256 * @nr_probe: number of platform devices to successfully probe before exiting
1257 * @user_only: only probe user specified early platform devices
Magnus Damm4d26e1392010-03-10 20:50:38 +09001258 *
1259 * Used by architecture code to probe registered early platform drivers
1260 * within a certain class. For probe to happen a registered early platform
1261 * device matching a registered early platform driver is needed.
Magnus Damm13977092009-03-30 14:37:25 -07001262 */
1263int __init early_platform_driver_probe(char *class_str,
1264 int nr_probe,
1265 int user_only)
1266{
1267 int k, n, i;
1268
1269 n = 0;
1270 for (i = -2; n < nr_probe; i++) {
1271 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1272
1273 if (k < 0)
1274 break;
1275
1276 n += k;
1277
1278 if (user_only)
1279 break;
1280 }
1281
1282 return n;
1283}
1284
1285/**
1286 * early_platform_cleanup - clean up early platform code
1287 */
1288void __init early_platform_cleanup(void)
1289{
1290 struct platform_device *pd, *pd2;
1291
1292 /* clean up the devres list used to chain devices */
1293 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1294 dev.devres_head) {
1295 list_del(&pd->dev.devres_head);
1296 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));
1297 }
1298}
1299