blob: 8dcbb266643b8773e212bc29f3b2137c3060e059 [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>
Rob Herring9ec36ca2014-04-23 17:57:41 -050016#include <linux/of_irq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/dma-mapping.h>
20#include <linux/bootmem.h>
21#include <linux/err.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080022#include <linux/slab.h>
Magnus Damm9d730222009-08-20 20:25:32 +020023#include <linux/pm_runtime.h>
Ulf Hanssonf48c7672014-09-29 13:58:47 +020024#include <linux/pm_domain.h>
Jean Delvare689ae232012-07-27 22:14:59 +020025#include <linux/idr.h>
Mika Westerberg91e56872012-10-31 22:45:02 +010026#include <linux/acpi.h>
Sylwester Nawrocki86be4082014-06-18 17:29:32 +020027#include <linux/clk/clk-conf.h>
Kim Phillips3d713e02014-06-02 19:42:58 -050028#include <linux/limits.h>
Mika Westerberg00bbc1d2015-11-30 17:11:38 +020029#include <linux/property.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Ben Dooksa1bdc7a2005-10-13 17:54:41 +010031#include "base.h"
Rafael J. Wysockibed2b422012-08-06 01:45:11 +020032#include "power/power.h"
Ben Dooksa1bdc7a2005-10-13 17:54:41 +010033
Jean Delvare689ae232012-07-27 22:14:59 +020034/* For automatically allocated device IDs */
35static DEFINE_IDA(platform_devid_ida);
36
Linus Torvalds1da177e2005-04-16 15:20:36 -070037struct device platform_bus = {
Kay Sievers1e0b2cf2008-10-30 01:36:48 +010038 .init_name = "platform",
Linus Torvalds1da177e2005-04-16 15:20:36 -070039};
Dmitry Torokhova96b2042005-12-10 01:36:28 -050040EXPORT_SYMBOL_GPL(platform_bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42/**
Kumar Galaa77ce812011-06-10 01:52:57 -050043 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
Randy Dunlap7de636f2011-07-27 12:11:25 -070044 * @pdev: platform device
Kumar Galaa77ce812011-06-10 01:52:57 -050045 *
46 * This is called before platform_device_add() such that any pdev_archdata may
47 * be setup before the platform_notifier is called. So if a user needs to
48 * manipulate any relevant information in the pdev_archdata they can do:
49 *
Sebastian Andrzej Siewiorb1d6d822012-10-29 18:04:53 +010050 * platform_device_alloc()
Fabio Porcedda0258e182013-03-26 10:35:16 +010051 * ... manipulate ...
52 * platform_device_add()
Kumar Galaa77ce812011-06-10 01:52:57 -050053 *
54 * And if they don't care they can just call platform_device_register() and
55 * everything will just work out.
56 */
57void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
58{
59}
60
61/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080062 * platform_get_resource - get a resource for a device
63 * @dev: platform device
64 * @type: resource type
65 * @num: resource index
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080067struct resource *platform_get_resource(struct platform_device *dev,
68 unsigned int type, unsigned int num)
Linus Torvalds1da177e2005-04-16 15:20:36 -070069{
70 int i;
71
72 for (i = 0; i < dev->num_resources; i++) {
73 struct resource *r = &dev->resource[i];
74
Magnus Dammc9f66162008-10-15 22:05:15 -070075 if (type == resource_type(r) && num-- == 0)
76 return r;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 }
78 return NULL;
79}
Dmitry Torokhova96b2042005-12-10 01:36:28 -050080EXPORT_SYMBOL_GPL(platform_get_resource);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080083 * platform_get_irq - get an IRQ for a device
84 * @dev: platform device
85 * @num: IRQ number index
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 */
87int platform_get_irq(struct platform_device *dev, unsigned int num)
88{
Andreas Larsson5cf8f7d2012-10-29 23:26:56 +000089#ifdef CONFIG_SPARC
90 /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
91 if (!dev || num >= dev->archdata.num_irqs)
92 return -ENXIO;
93 return dev->archdata.irqs[num];
94#else
Rob Herring9ec36ca2014-04-23 17:57:41 -050095 struct resource *r;
Guenter Roeckaff008a2014-06-17 15:51:02 -070096 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
97 int ret;
98
99 ret = of_irq_get(dev->dev.of_node, num);
100 if (ret >= 0 || ret == -EPROBE_DEFER)
101 return ret;
102 }
Rob Herring9ec36ca2014-04-23 17:57:41 -0500103
104 r = platform_get_resource(dev, IORESOURCE_IRQ, num);
Linus Walleij7085a742015-02-18 17:12:18 +0100105 /*
106 * The resources may pass trigger flags to the irqs that need
107 * to be set up. It so happens that the trigger flags for
108 * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER*
109 * settings.
110 */
111 if (r && r->flags & IORESOURCE_BITS)
112 irqd_set_trigger_type(irq_get_irq_data(r->start),
113 r->flags & IORESOURCE_BITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
David Vrabel305b3222006-01-19 17:52:27 +0000115 return r ? r->start : -ENXIO;
Andreas Larsson5cf8f7d2012-10-29 23:26:56 +0000116#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500118EXPORT_SYMBOL_GPL(platform_get_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120/**
Stephen Boyd4b835552016-01-06 17:12:47 -0800121 * platform_irq_count - Count the number of IRQs a platform device uses
122 * @dev: platform device
123 *
124 * Return: Number of IRQs a platform device uses or EPROBE_DEFER
125 */
126int platform_irq_count(struct platform_device *dev)
127{
128 int ret, nr = 0;
129
130 while ((ret = platform_get_irq(dev, nr)) >= 0)
131 nr++;
132
133 if (ret == -EPROBE_DEFER)
134 return ret;
135
136 return nr;
137}
138EXPORT_SYMBOL_GPL(platform_irq_count);
139
140/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800141 * platform_get_resource_byname - get a resource for a device by name
142 * @dev: platform device
143 * @type: resource type
144 * @name: resource name
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800146struct resource *platform_get_resource_byname(struct platform_device *dev,
Linus Walleijc0afe7b2009-04-27 02:38:16 +0200147 unsigned int type,
148 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
150 int i;
151
152 for (i = 0; i < dev->num_resources; i++) {
153 struct resource *r = &dev->resource[i];
154
Peter Ujfalusi1b8cb922012-08-23 17:10:00 +0300155 if (unlikely(!r->name))
156 continue;
157
Magnus Dammc9f66162008-10-15 22:05:15 -0700158 if (type == resource_type(r) && !strcmp(r->name, name))
159 return r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 }
161 return NULL;
162}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500163EXPORT_SYMBOL_GPL(platform_get_resource_byname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
165/**
Wolfram Sangd6ff8552012-11-13 17:47:13 +0100166 * platform_get_irq_byname - get an IRQ for a device by name
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800167 * @dev: platform device
168 * @name: IRQ name
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 */
Linus Walleijc0afe7b2009-04-27 02:38:16 +0200170int platform_get_irq_byname(struct platform_device *dev, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171{
Grygorii Strashkoad696742014-05-20 13:42:02 +0300172 struct resource *r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Guenter Roeckaff008a2014-06-17 15:51:02 -0700174 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
175 int ret;
176
177 ret = of_irq_get_byname(dev->dev.of_node, name);
178 if (ret >= 0 || ret == -EPROBE_DEFER)
179 return ret;
180 }
Grygorii Strashkoad696742014-05-20 13:42:02 +0300181
182 r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
David Vrabel305b3222006-01-19 17:52:27 +0000183 return r ? r->start : -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500185EXPORT_SYMBOL_GPL(platform_get_irq_byname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
187/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800188 * platform_add_devices - add a numbers of platform devices
189 * @devs: array of platform devices to add
190 * @num: number of platform devices in array
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 */
192int platform_add_devices(struct platform_device **devs, int num)
193{
194 int i, ret = 0;
195
196 for (i = 0; i < num; i++) {
197 ret = platform_device_register(devs[i]);
198 if (ret) {
199 while (--i >= 0)
200 platform_device_unregister(devs[i]);
201 break;
202 }
203 }
204
205 return ret;
206}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500207EXPORT_SYMBOL_GPL(platform_add_devices);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
Russell King37c12e72005-11-05 21:19:33 +0000209struct platform_object {
210 struct platform_device pdev;
Yann Droneaud1cec24c2014-05-30 22:02:47 +0200211 char name[];
Russell King37c12e72005-11-05 21:19:33 +0000212};
213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000215 * platform_device_put - destroy a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800216 * @pdev: platform device to free
Russell King37c12e72005-11-05 21:19:33 +0000217 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800218 * Free all memory associated with a platform device. This function must
219 * _only_ be externally called in error cases. All other usage is a bug.
Russell King37c12e72005-11-05 21:19:33 +0000220 */
221void platform_device_put(struct platform_device *pdev)
222{
223 if (pdev)
224 put_device(&pdev->dev);
225}
226EXPORT_SYMBOL_GPL(platform_device_put);
227
228static void platform_device_release(struct device *dev)
229{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800230 struct platform_object *pa = container_of(dev, struct platform_object,
231 pdev.dev);
Russell King37c12e72005-11-05 21:19:33 +0000232
Grant Likely7096d042010-10-20 11:45:13 -0600233 of_device_node_put(&pa->pdev.dev);
Russell King37c12e72005-11-05 21:19:33 +0000234 kfree(pa->pdev.dev.platform_data);
Samuel Ortize710d7d2011-04-08 00:43:01 +0200235 kfree(pa->pdev.mfd_cell);
Russell King37c12e72005-11-05 21:19:33 +0000236 kfree(pa->pdev.resource);
Kim Phillips3d713e02014-06-02 19:42:58 -0500237 kfree(pa->pdev.driver_override);
Russell King37c12e72005-11-05 21:19:33 +0000238 kfree(pa);
239}
240
241/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000242 * platform_device_alloc - create a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800243 * @name: base name of the device we're adding
244 * @id: instance id
Russell King37c12e72005-11-05 21:19:33 +0000245 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800246 * Create a platform device object which can have other objects attached
247 * to it, and which will have attached objects freed when it is released.
Russell King37c12e72005-11-05 21:19:33 +0000248 */
Jean Delvare1359555e2007-09-09 12:54:16 +0200249struct platform_device *platform_device_alloc(const char *name, int id)
Russell King37c12e72005-11-05 21:19:33 +0000250{
251 struct platform_object *pa;
252
Yann Droneaud1cec24c2014-05-30 22:02:47 +0200253 pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL);
Russell King37c12e72005-11-05 21:19:33 +0000254 if (pa) {
255 strcpy(pa->name, name);
256 pa->pdev.name = pa->name;
257 pa->pdev.id = id;
258 device_initialize(&pa->pdev.dev);
259 pa->pdev.dev.release = platform_device_release;
Kumar Galaa77ce812011-06-10 01:52:57 -0500260 arch_setup_pdev_archdata(&pa->pdev);
Russell King37c12e72005-11-05 21:19:33 +0000261 }
262
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500263 return pa ? &pa->pdev : NULL;
Russell King37c12e72005-11-05 21:19:33 +0000264}
265EXPORT_SYMBOL_GPL(platform_device_alloc);
266
267/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000268 * platform_device_add_resources - add resources to a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800269 * @pdev: platform device allocated by platform_device_alloc to add resources to
270 * @res: set of resources that needs to be allocated for the device
271 * @num: number of resources
Russell King37c12e72005-11-05 21:19:33 +0000272 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800273 * Add a copy of the resources to the platform device. The memory
274 * associated with the resources will be freed when the platform device is
275 * released.
Russell King37c12e72005-11-05 21:19:33 +0000276 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800277int platform_device_add_resources(struct platform_device *pdev,
Geert Uytterhoeven0b7f1a72009-01-28 21:01:02 +0100278 const struct resource *res, unsigned int num)
Russell King37c12e72005-11-05 21:19:33 +0000279{
Uwe Kleine-Königcea89622011-04-20 09:44:44 +0200280 struct resource *r = NULL;
Russell King37c12e72005-11-05 21:19:33 +0000281
Uwe Kleine-Königcea89622011-04-20 09:44:44 +0200282 if (res) {
283 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
284 if (!r)
285 return -ENOMEM;
Russell King37c12e72005-11-05 21:19:33 +0000286 }
Uwe Kleine-Königcea89622011-04-20 09:44:44 +0200287
Uwe Kleine-König4a03d6f2011-04-20 09:44:45 +0200288 kfree(pdev->resource);
Uwe Kleine-Königcea89622011-04-20 09:44:44 +0200289 pdev->resource = r;
290 pdev->num_resources = num;
291 return 0;
Russell King37c12e72005-11-05 21:19:33 +0000292}
293EXPORT_SYMBOL_GPL(platform_device_add_resources);
294
295/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000296 * platform_device_add_data - add platform-specific data to a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800297 * @pdev: platform device allocated by platform_device_alloc to add resources to
298 * @data: platform specific data for this platform device
299 * @size: size of platform specific data
Russell King37c12e72005-11-05 21:19:33 +0000300 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800301 * Add a copy of platform specific data to the platform device's
302 * platform_data pointer. The memory associated with the platform data
303 * will be freed when the platform device is released.
Russell King37c12e72005-11-05 21:19:33 +0000304 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800305int platform_device_add_data(struct platform_device *pdev, const void *data,
306 size_t size)
Russell King37c12e72005-11-05 21:19:33 +0000307{
Uwe Kleine-König27a33f92011-04-20 09:44:42 +0200308 void *d = NULL;
Russell King37c12e72005-11-05 21:19:33 +0000309
Uwe Kleine-König27a33f92011-04-20 09:44:42 +0200310 if (data) {
311 d = kmemdup(data, size, GFP_KERNEL);
312 if (!d)
313 return -ENOMEM;
Russell King37c12e72005-11-05 21:19:33 +0000314 }
Uwe Kleine-König27a33f92011-04-20 09:44:42 +0200315
Uwe Kleine-König251e0312011-04-20 09:44:43 +0200316 kfree(pdev->dev.platform_data);
Uwe Kleine-König27a33f92011-04-20 09:44:42 +0200317 pdev->dev.platform_data = d;
318 return 0;
Russell King37c12e72005-11-05 21:19:33 +0000319}
320EXPORT_SYMBOL_GPL(platform_device_add_data);
321
322/**
Mika Westerberg00bbc1d2015-11-30 17:11:38 +0200323 * platform_device_add_properties - add built-in properties to a platform device
324 * @pdev: platform device to add properties to
325 * @pset: properties to add
326 *
327 * The function will take deep copy of the properties in @pset and attach
328 * the copy to the platform device. The memory associated with properties
329 * will be freed when the platform device is released.
330 */
331int platform_device_add_properties(struct platform_device *pdev,
332 const struct property_set *pset)
333{
334 return device_add_property_set(&pdev->dev, pset);
335}
336EXPORT_SYMBOL_GPL(platform_device_add_properties);
337
338/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800339 * platform_device_add - add a platform device to device hierarchy
340 * @pdev: platform device we're adding
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800342 * This is part 2 of platform_device_register(), though may be called
343 * separately _iff_ pdev was allocated by platform_device_alloc().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 */
Russell King37c12e72005-11-05 21:19:33 +0000345int platform_device_add(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346{
Jean Delvare689ae232012-07-27 22:14:59 +0200347 int i, ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349 if (!pdev)
350 return -EINVAL;
351
352 if (!pdev->dev.parent)
353 pdev->dev.parent = &platform_bus;
354
355 pdev->dev.bus = &platform_bus_type;
356
Jean Delvare689ae232012-07-27 22:14:59 +0200357 switch (pdev->id) {
358 default:
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100359 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
Jean Delvare689ae232012-07-27 22:14:59 +0200360 break;
361 case PLATFORM_DEVID_NONE:
Greg Kroah-Hartmanacc0e902009-06-02 15:39:55 -0700362 dev_set_name(&pdev->dev, "%s", pdev->name);
Jean Delvare689ae232012-07-27 22:14:59 +0200363 break;
364 case PLATFORM_DEVID_AUTO:
365 /*
366 * Automatically allocated device ID. We mark it as such so
367 * that we remember it must be freed, and we append a suffix
368 * to avoid namespace collision with explicit IDs.
369 */
370 ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL);
371 if (ret < 0)
Greg Kroah-Hartman5da7f702015-06-10 08:38:02 -0700372 goto err_out;
Jean Delvare689ae232012-07-27 22:14:59 +0200373 pdev->id = ret;
374 pdev->id_auto = true;
375 dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
376 break;
377 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
379 for (i = 0; i < pdev->num_resources; i++) {
Greg Kroah-Hartman5da7f702015-06-10 08:38:02 -0700380 struct resource *p, *r = &pdev->resource[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
382 if (r->name == NULL)
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100383 r->name = dev_name(&pdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
385 p = r->parent;
386 if (!p) {
Greg Kroah-Hartman0e6c8612015-06-10 08:38:29 -0700387 if (resource_type(r) == IORESOURCE_MEM)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 p = &iomem_resource;
Greg Kroah-Hartman0e6c8612015-06-10 08:38:29 -0700389 else if (resource_type(r) == IORESOURCE_IO)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 p = &ioport_resource;
391 }
392
Greg Kroah-Hartman0e6c8612015-06-10 08:38:29 -0700393 if (p && insert_resource(p, r)) {
Greg Kroah-Hartman5da7f702015-06-10 08:38:02 -0700394 dev_err(&pdev->dev, "failed to claim resource %d\n", i);
395 ret = -EBUSY;
396 goto failed;
397 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 }
399
400 pr_debug("Registering platform device '%s'. Parent at %s\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100401 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
Russell Kinge3915532006-05-06 08:15:26 +0100403 ret = device_add(&pdev->dev);
Greg Kroah-Hartman8b2dceb2015-06-10 08:36:50 -0700404 if (ret == 0)
405 return ret;
406
Greg Kroah-Hartman5da7f702015-06-10 08:38:02 -0700407 failed:
Greg Kroah-Hartman8b2dceb2015-06-10 08:36:50 -0700408 if (pdev->id_auto) {
409 ida_simple_remove(&platform_devid_ida, pdev->id);
410 pdev->id = PLATFORM_DEVID_AUTO;
411 }
412
413 while (--i >= 0) {
414 struct resource *r = &pdev->resource[i];
Grant Likely7f5dcaf2015-06-07 15:20:11 +0100415 if (r->parent)
Greg Kroah-Hartman8b2dceb2015-06-10 08:36:50 -0700416 release_resource(r);
417 }
Magnus Dammc9f66162008-10-15 22:05:15 -0700418
Greg Kroah-Hartman5da7f702015-06-10 08:38:02 -0700419 err_out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 return ret;
421}
Russell King37c12e72005-11-05 21:19:33 +0000422EXPORT_SYMBOL_GPL(platform_device_add);
423
424/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800425 * platform_device_del - remove a platform-level device
426 * @pdev: platform device we're removing
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500427 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800428 * Note that this function will also release all memory- and port-based
429 * resources owned by the device (@dev->resource). This function must
430 * _only_ be externally called in error cases. All other usage is a bug.
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500431 */
432void platform_device_del(struct platform_device *pdev)
433{
Greg Kroah-Hartman8b2dceb2015-06-10 08:36:50 -0700434 int i;
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500435
Greg Kroah-Hartman8b2dceb2015-06-10 08:36:50 -0700436 if (pdev) {
437 device_del(&pdev->dev);
438
439 if (pdev->id_auto) {
440 ida_simple_remove(&platform_devid_ida, pdev->id);
441 pdev->id = PLATFORM_DEVID_AUTO;
442 }
443
444 for (i = 0; i < pdev->num_resources; i++) {
445 struct resource *r = &pdev->resource[i];
Grant Likely7f5dcaf2015-06-07 15:20:11 +0100446 if (r->parent)
Greg Kroah-Hartman8b2dceb2015-06-10 08:36:50 -0700447 release_resource(r);
448 }
Mika Westerberg00bbc1d2015-11-30 17:11:38 +0200449
450 device_remove_property_set(&pdev->dev);
Greg Kroah-Hartman8b2dceb2015-06-10 08:36:50 -0700451 }
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500452}
453EXPORT_SYMBOL_GPL(platform_device_del);
454
455/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800456 * platform_device_register - add a platform-level device
457 * @pdev: platform device we're adding
Russell King37c12e72005-11-05 21:19:33 +0000458 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800459int platform_device_register(struct platform_device *pdev)
Russell King37c12e72005-11-05 21:19:33 +0000460{
461 device_initialize(&pdev->dev);
Kumar Galaa77ce812011-06-10 01:52:57 -0500462 arch_setup_pdev_archdata(pdev);
Russell King37c12e72005-11-05 21:19:33 +0000463 return platform_device_add(pdev);
464}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500465EXPORT_SYMBOL_GPL(platform_device_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466
467/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800468 * platform_device_unregister - unregister a platform-level device
469 * @pdev: platform device we're unregistering
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800471 * Unregistration is done in 2 steps. First we release all resources
472 * and remove it from the subsystem, then we drop reference count by
473 * calling platform_device_put().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800475void platform_device_unregister(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476{
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500477 platform_device_del(pdev);
478 platform_device_put(pdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500480EXPORT_SYMBOL_GPL(platform_device_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482/**
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200483 * platform_device_register_full - add a platform-level device with
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200484 * resources and platform-specific data
485 *
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200486 * @pdevinfo: data used to create device
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700487 *
Jani Nikulaf0eae0e2010-03-11 18:11:45 +0200488 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700489 */
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200490struct platform_device *platform_device_register_full(
Uwe Kleine-König5a3072b2011-12-08 22:53:29 +0100491 const struct platform_device_info *pdevinfo)
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700492{
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200493 int ret = -ENOMEM;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700494 struct platform_device *pdev;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700495
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200496 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200497 if (!pdev)
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200498 goto err_alloc;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700499
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200500 pdev->dev.parent = pdevinfo->parent;
Rafael J. Wysockice793482015-03-16 23:49:03 +0100501 pdev->dev.fwnode = pdevinfo->fwnode;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700502
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200503 if (pdevinfo->dma_mask) {
504 /*
505 * This memory isn't freed when the device is put,
506 * I don't have a nice idea for that though. Conceptually
507 * dma_mask in struct device should not be a pointer.
508 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
509 */
510 pdev->dev.dma_mask =
511 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
512 if (!pdev->dev.dma_mask)
513 goto err;
514
515 *pdev->dev.dma_mask = pdevinfo->dma_mask;
516 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
517 }
518
519 ret = platform_device_add_resources(pdev,
520 pdevinfo->res, pdevinfo->num_res);
Anton Vorontsov807508c2010-09-07 17:31:54 +0400521 if (ret)
522 goto err;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700523
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200524 ret = platform_device_add_data(pdev,
525 pdevinfo->data, pdevinfo->size_data);
Anton Vorontsov807508c2010-09-07 17:31:54 +0400526 if (ret)
527 goto err;
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200528
Mika Westerberg00bbc1d2015-11-30 17:11:38 +0200529 if (pdevinfo->pset) {
530 ret = platform_device_add_properties(pdev, pdevinfo->pset);
531 if (ret)
532 goto err;
533 }
534
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200535 ret = platform_device_add(pdev);
536 if (ret) {
537err:
Rafael J. Wysocki7b199812013-11-11 22:41:56 +0100538 ACPI_COMPANION_SET(&pdev->dev, NULL);
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200539 kfree(pdev->dev.dma_mask);
540
541err_alloc:
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200542 platform_device_put(pdev);
543 return ERR_PTR(ret);
544 }
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700545
546 return pdev;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700547}
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200548EXPORT_SYMBOL_GPL(platform_device_register_full);
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700549
Russell King00d3dcd2005-11-09 17:23:39 +0000550static int platform_drv_probe(struct device *_dev)
551{
552 struct platform_driver *drv = to_platform_driver(_dev->driver);
553 struct platform_device *dev = to_platform_device(_dev);
Rafael J. Wysocki94d76d52012-11-26 10:04:53 +0100554 int ret;
Russell King00d3dcd2005-11-09 17:23:39 +0000555
Sylwester Nawrocki86be4082014-06-18 17:29:32 +0200556 ret = of_clk_set_defaults(_dev->of_node, false);
557 if (ret < 0)
558 return ret;
559
Ulf Hanssoncb518412014-09-19 20:27:38 +0200560 ret = dev_pm_domain_attach(_dev, true);
Uwe Kleine-Königb8b2c7d2015-08-07 07:19:22 +0200561 if (ret != -EPROBE_DEFER && drv->probe) {
Ulf Hanssoncb518412014-09-19 20:27:38 +0200562 ret = drv->probe(dev);
563 if (ret)
564 dev_pm_domain_detach(_dev, true);
565 }
Rafael J. Wysocki94d76d52012-11-26 10:04:53 +0100566
Johan Hovold3f9120b2013-09-23 16:27:26 +0200567 if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) {
568 dev_warn(_dev, "probe deferral not supported\n");
569 ret = -ENXIO;
570 }
571
Rafael J. Wysocki94d76d52012-11-26 10:04:53 +0100572 return ret;
Russell King00d3dcd2005-11-09 17:23:39 +0000573}
574
David Brownellc67334f2006-11-16 23:28:47 -0800575static int platform_drv_probe_fail(struct device *_dev)
576{
577 return -ENXIO;
578}
579
Russell King00d3dcd2005-11-09 17:23:39 +0000580static int platform_drv_remove(struct device *_dev)
581{
582 struct platform_driver *drv = to_platform_driver(_dev->driver);
583 struct platform_device *dev = to_platform_device(_dev);
Uwe Kleine-Königb8b2c7d2015-08-07 07:19:22 +0200584 int ret = 0;
Russell King00d3dcd2005-11-09 17:23:39 +0000585
Uwe Kleine-Königb8b2c7d2015-08-07 07:19:22 +0200586 if (drv->remove)
587 ret = drv->remove(dev);
Ulf Hanssoncb518412014-09-19 20:27:38 +0200588 dev_pm_domain_detach(_dev, true);
Rafael J. Wysocki94d76d52012-11-26 10:04:53 +0100589
590 return ret;
Russell King00d3dcd2005-11-09 17:23:39 +0000591}
592
593static void platform_drv_shutdown(struct device *_dev)
594{
595 struct platform_driver *drv = to_platform_driver(_dev->driver);
596 struct platform_device *dev = to_platform_device(_dev);
597
Uwe Kleine-Königb8b2c7d2015-08-07 07:19:22 +0200598 if (drv->shutdown)
599 drv->shutdown(dev);
Ulf Hanssoncb518412014-09-19 20:27:38 +0200600 dev_pm_domain_detach(_dev, true);
Russell King00d3dcd2005-11-09 17:23:39 +0000601}
602
Russell King00d3dcd2005-11-09 17:23:39 +0000603/**
Libo Chen94470572013-05-25 12:40:50 +0800604 * __platform_driver_register - register a driver for platform-level devices
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800605 * @drv: platform driver structure
Randy Dunlap08801f92013-07-14 17:43:06 -0700606 * @owner: owning module/driver
Russell King00d3dcd2005-11-09 17:23:39 +0000607 */
Libo Chen94470572013-05-25 12:40:50 +0800608int __platform_driver_register(struct platform_driver *drv,
609 struct module *owner)
Russell King00d3dcd2005-11-09 17:23:39 +0000610{
Libo Chen94470572013-05-25 12:40:50 +0800611 drv->driver.owner = owner;
Russell King00d3dcd2005-11-09 17:23:39 +0000612 drv->driver.bus = &platform_bus_type;
Uwe Kleine-Königb8b2c7d2015-08-07 07:19:22 +0200613 drv->driver.probe = platform_drv_probe;
614 drv->driver.remove = platform_drv_remove;
615 drv->driver.shutdown = platform_drv_shutdown;
Magnus Damm783ea7d2009-06-04 22:13:33 +0200616
Russell King00d3dcd2005-11-09 17:23:39 +0000617 return driver_register(&drv->driver);
618}
Libo Chen94470572013-05-25 12:40:50 +0800619EXPORT_SYMBOL_GPL(__platform_driver_register);
Russell King00d3dcd2005-11-09 17:23:39 +0000620
621/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000622 * platform_driver_unregister - unregister a driver for platform-level devices
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800623 * @drv: platform driver structure
Russell King00d3dcd2005-11-09 17:23:39 +0000624 */
625void platform_driver_unregister(struct platform_driver *drv)
626{
627 driver_unregister(&drv->driver);
628}
629EXPORT_SYMBOL_GPL(platform_driver_unregister);
630
David Brownellc67334f2006-11-16 23:28:47 -0800631/**
Wolfram Sangc3b50dc2014-10-28 17:40:41 +0100632 * __platform_driver_probe - register driver for non-hotpluggable device
David Brownellc67334f2006-11-16 23:28:47 -0800633 * @drv: platform driver structure
Johan Hovold3f9120b2013-09-23 16:27:26 +0200634 * @probe: the driver probe routine, probably from an __init section
Wolfram Sangc3b50dc2014-10-28 17:40:41 +0100635 * @module: module which will be the owner of the driver
David Brownellc67334f2006-11-16 23:28:47 -0800636 *
637 * Use this instead of platform_driver_register() when you know the device
638 * is not hotpluggable and has already been registered, and you want to
639 * remove its run-once probe() infrastructure from memory after the driver
640 * has bound to the device.
641 *
642 * One typical use for this would be with drivers for controllers integrated
643 * into system-on-chip processors, where the controller devices have been
644 * configured as part of board setup.
645 *
Johan Hovold3f9120b2013-09-23 16:27:26 +0200646 * Note that this is incompatible with deferred probing.
Fabio Porcedda647c86d2013-03-26 10:35:15 +0100647 *
David Brownellc67334f2006-11-16 23:28:47 -0800648 * Returns zero if the driver registered and bound to a device, else returns
649 * a negative error code and with the driver not registered.
650 */
Wolfram Sangc3b50dc2014-10-28 17:40:41 +0100651int __init_or_module __platform_driver_probe(struct platform_driver *drv,
652 int (*probe)(struct platform_device *), struct module *module)
David Brownellc67334f2006-11-16 23:28:47 -0800653{
654 int retval, code;
655
Dmitry Torokhov5c36eb22015-03-30 16:20:07 -0700656 if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) {
657 pr_err("%s: drivers registered with %s can not be probed asynchronously\n",
658 drv->driver.name, __func__);
659 return -EINVAL;
660 }
661
662 /*
663 * We have to run our probes synchronously because we check if
664 * we find any devices to bind to and exit with error if there
665 * are any.
666 */
667 drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS;
668
Johan Hovold3f9120b2013-09-23 16:27:26 +0200669 /*
670 * Prevent driver from requesting probe deferral to avoid further
671 * futile probe attempts.
672 */
673 drv->prevent_deferred_probe = true;
674
Dmitry Torokhov1a6f2a72009-10-12 20:17:41 -0700675 /* make sure driver won't have bind/unbind attributes */
676 drv->driver.suppress_bind_attrs = true;
677
David Brownellc67334f2006-11-16 23:28:47 -0800678 /* temporary section violation during probe() */
679 drv->probe = probe;
Wolfram Sangc3b50dc2014-10-28 17:40:41 +0100680 retval = code = __platform_driver_register(drv, module);
David Brownellc67334f2006-11-16 23:28:47 -0800681
Dmitry Torokhov1a6f2a72009-10-12 20:17:41 -0700682 /*
683 * Fixup that section violation, being paranoid about code scanning
David Brownellc67334f2006-11-16 23:28:47 -0800684 * the list of drivers in order to probe new devices. Check to see
685 * if the probe was successful, and make sure any forced probes of
686 * new devices fail.
687 */
Patrick Pannutod79d3242010-08-06 17:12:41 -0700688 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
David Brownellc67334f2006-11-16 23:28:47 -0800689 drv->probe = NULL;
Greg Kroah-Hartmane5dd1272007-11-28 15:59:15 -0800690 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
David Brownellc67334f2006-11-16 23:28:47 -0800691 retval = -ENODEV;
692 drv->driver.probe = platform_drv_probe_fail;
Patrick Pannutod79d3242010-08-06 17:12:41 -0700693 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
David Brownellc67334f2006-11-16 23:28:47 -0800694
695 if (code != retval)
696 platform_driver_unregister(drv);
697 return retval;
698}
Wolfram Sangc3b50dc2014-10-28 17:40:41 +0100699EXPORT_SYMBOL_GPL(__platform_driver_probe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800701/**
Wolfram Sang291f6532014-10-28 17:40:42 +0100702 * __platform_create_bundle - register driver and create corresponding device
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800703 * @driver: platform driver structure
704 * @probe: the driver probe routine, probably from an __init section
705 * @res: set of resources that needs to be allocated for the device
706 * @n_res: number of resources
707 * @data: platform specific data for this platform device
708 * @size: size of platform specific data
Wolfram Sang291f6532014-10-28 17:40:42 +0100709 * @module: module which will be the owner of the driver
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800710 *
711 * Use this in legacy-style modules that probe hardware directly and
712 * register a single platform device and corresponding platform driver.
Jani Nikulaf0eae0e2010-03-11 18:11:45 +0200713 *
714 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800715 */
Wolfram Sang291f6532014-10-28 17:40:42 +0100716struct platform_device * __init_or_module __platform_create_bundle(
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800717 struct platform_driver *driver,
718 int (*probe)(struct platform_device *),
719 struct resource *res, unsigned int n_res,
Wolfram Sang291f6532014-10-28 17:40:42 +0100720 const void *data, size_t size, struct module *module)
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800721{
722 struct platform_device *pdev;
723 int error;
724
725 pdev = platform_device_alloc(driver->driver.name, -1);
726 if (!pdev) {
727 error = -ENOMEM;
728 goto err_out;
729 }
730
Anton Vorontsov807508c2010-09-07 17:31:54 +0400731 error = platform_device_add_resources(pdev, res, n_res);
732 if (error)
733 goto err_pdev_put;
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800734
Anton Vorontsov807508c2010-09-07 17:31:54 +0400735 error = platform_device_add_data(pdev, data, size);
736 if (error)
737 goto err_pdev_put;
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800738
739 error = platform_device_add(pdev);
740 if (error)
741 goto err_pdev_put;
742
Wolfram Sang291f6532014-10-28 17:40:42 +0100743 error = __platform_driver_probe(driver, probe, module);
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800744 if (error)
745 goto err_pdev_del;
746
747 return pdev;
748
749err_pdev_del:
750 platform_device_del(pdev);
751err_pdev_put:
752 platform_device_put(pdev);
753err_out:
754 return ERR_PTR(error);
755}
Wolfram Sang291f6532014-10-28 17:40:42 +0100756EXPORT_SYMBOL_GPL(__platform_create_bundle);
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800757
Thierry Redingdbe22562015-09-25 17:29:04 +0200758/**
759 * __platform_register_drivers - register an array of platform drivers
760 * @drivers: an array of drivers to register
761 * @count: the number of drivers to register
762 * @owner: module owning the drivers
763 *
764 * Registers platform drivers specified by an array. On failure to register a
765 * driver, all previously registered drivers will be unregistered. Callers of
766 * this API should use platform_unregister_drivers() to unregister drivers in
767 * the reverse order.
768 *
769 * Returns: 0 on success or a negative error code on failure.
770 */
771int __platform_register_drivers(struct platform_driver * const *drivers,
772 unsigned int count, struct module *owner)
773{
774 unsigned int i;
775 int err;
776
777 for (i = 0; i < count; i++) {
778 pr_debug("registering platform driver %ps\n", drivers[i]);
779
780 err = __platform_driver_register(drivers[i], owner);
781 if (err < 0) {
782 pr_err("failed to register platform driver %ps: %d\n",
783 drivers[i], err);
784 goto error;
785 }
786 }
787
788 return 0;
789
790error:
791 while (i--) {
792 pr_debug("unregistering platform driver %ps\n", drivers[i]);
793 platform_driver_unregister(drivers[i]);
794 }
795
796 return err;
797}
798EXPORT_SYMBOL_GPL(__platform_register_drivers);
799
800/**
801 * platform_unregister_drivers - unregister an array of platform drivers
802 * @drivers: an array of drivers to unregister
803 * @count: the number of drivers to unregister
804 *
805 * Unegisters platform drivers specified by an array. This is typically used
806 * to complement an earlier call to platform_register_drivers(). Drivers are
807 * unregistered in the reverse order in which they were registered.
808 */
809void platform_unregister_drivers(struct platform_driver * const *drivers,
810 unsigned int count)
811{
812 while (count--) {
813 pr_debug("unregistering platform driver %ps\n", drivers[count]);
814 platform_driver_unregister(drivers[count]);
815 }
816}
817EXPORT_SYMBOL_GPL(platform_unregister_drivers);
818
David Brownella0245f72006-05-29 10:37:33 -0700819/* modalias support enables more hands-off userspace setup:
820 * (a) environment variable lets new-style hotplug events work once system is
821 * fully running: "modprobe $MODALIAS"
822 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
823 * mishandled before system is fully running: "modprobe $(cat modalias)"
824 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800825static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
826 char *buf)
David Brownella0245f72006-05-29 10:37:33 -0700827{
828 struct platform_device *pdev = to_platform_device(dev);
Zhang Rui8c4ff6d2014-01-14 16:46:37 +0800829 int len;
830
Zhang Ruib9f73062014-01-14 16:46:38 +0800831 len = of_device_get_modalias(dev, buf, PAGE_SIZE -1);
832 if (len != -ENODEV)
833 return len;
834
Zhang Rui8c4ff6d2014-01-14 16:46:37 +0800835 len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
836 if (len != -ENODEV)
837 return len;
838
839 len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
David Brownella0245f72006-05-29 10:37:33 -0700840
841 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
842}
Greg Kroah-Hartmand06262e2013-08-23 14:24:37 -0700843static DEVICE_ATTR_RO(modalias);
David Brownella0245f72006-05-29 10:37:33 -0700844
Kim Phillips3d713e02014-06-02 19:42:58 -0500845static ssize_t driver_override_store(struct device *dev,
846 struct device_attribute *attr,
847 const char *buf, size_t count)
848{
849 struct platform_device *pdev = to_platform_device(dev);
850 char *driver_override, *old = pdev->driver_override, *cp;
851
852 if (count > PATH_MAX)
853 return -EINVAL;
854
855 driver_override = kstrndup(buf, count, GFP_KERNEL);
856 if (!driver_override)
857 return -ENOMEM;
858
859 cp = strchr(driver_override, '\n');
860 if (cp)
861 *cp = '\0';
862
863 if (strlen(driver_override)) {
864 pdev->driver_override = driver_override;
865 } else {
866 kfree(driver_override);
867 pdev->driver_override = NULL;
868 }
869
870 kfree(old);
871
872 return count;
873}
874
875static ssize_t driver_override_show(struct device *dev,
876 struct device_attribute *attr, char *buf)
877{
878 struct platform_device *pdev = to_platform_device(dev);
879
880 return sprintf(buf, "%s\n", pdev->driver_override);
881}
882static DEVICE_ATTR_RW(driver_override);
883
884
Greg Kroah-Hartmand06262e2013-08-23 14:24:37 -0700885static struct attribute *platform_dev_attrs[] = {
886 &dev_attr_modalias.attr,
Kim Phillips3d713e02014-06-02 19:42:58 -0500887 &dev_attr_driver_override.attr,
Greg Kroah-Hartmand06262e2013-08-23 14:24:37 -0700888 NULL,
David Brownella0245f72006-05-29 10:37:33 -0700889};
Greg Kroah-Hartmand06262e2013-08-23 14:24:37 -0700890ATTRIBUTE_GROUPS(platform_dev);
David Brownella0245f72006-05-29 10:37:33 -0700891
Kay Sievers7eff2e72007-08-14 15:15:12 +0200892static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
David Brownella0245f72006-05-29 10:37:33 -0700893{
894 struct platform_device *pdev = to_platform_device(dev);
Grant Likelyeca39302010-06-08 07:48:21 -0600895 int rc;
896
897 /* Some devices have extra OF data and an OF-style MODALIAS */
Fabio Porcedda0258e182013-03-26 10:35:16 +0100898 rc = of_device_uevent_modalias(dev, env);
Grant Likelyeca39302010-06-08 07:48:21 -0600899 if (rc != -ENODEV)
900 return rc;
David Brownella0245f72006-05-29 10:37:33 -0700901
Zhang Rui8c4ff6d2014-01-14 16:46:37 +0800902 rc = acpi_device_uevent_modalias(dev, env);
903 if (rc != -ENODEV)
904 return rc;
905
Eric Miao57fee4a2009-02-04 11:52:40 +0800906 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
Sebastian Andrzej Siewior0a268132011-08-15 16:51:22 +0200907 pdev->name);
David Brownella0245f72006-05-29 10:37:33 -0700908 return 0;
909}
910
Eric Miao57fee4a2009-02-04 11:52:40 +0800911static const struct platform_device_id *platform_match_id(
Uwe Kleine-König831fad22010-01-26 09:35:00 +0100912 const struct platform_device_id *id,
Eric Miao57fee4a2009-02-04 11:52:40 +0800913 struct platform_device *pdev)
914{
915 while (id->name[0]) {
916 if (strcmp(pdev->name, id->name) == 0) {
917 pdev->id_entry = id;
918 return id;
919 }
920 id++;
921 }
922 return NULL;
923}
924
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800926 * platform_match - bind platform device to platform driver.
927 * @dev: device.
928 * @drv: driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800930 * Platform device IDs are assumed to be encoded like this:
931 * "<name><instance>", where <name> is a short description of the type of
932 * device, like "pci" or "floppy", and <instance> is the enumerated
933 * instance of the device, like '0' or '42'. Driver IDs are simply
934 * "<name>". So, extract the <name> from the platform_device structure,
935 * and compare it against the name of the driver. Return whether they match
936 * or not.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800938static int platform_match(struct device *dev, struct device_driver *drv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939{
Eric Miao71b3e0c2009-01-31 22:47:44 +0800940 struct platform_device *pdev = to_platform_device(dev);
Eric Miao57fee4a2009-02-04 11:52:40 +0800941 struct platform_driver *pdrv = to_platform_driver(drv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942
Kim Phillips3d713e02014-06-02 19:42:58 -0500943 /* When driver_override is set, only bind to the matching driver */
944 if (pdev->driver_override)
945 return !strcmp(pdev->driver_override, drv->name);
946
Grant Likely05212152010-06-08 07:48:20 -0600947 /* Attempt an OF style match first */
948 if (of_driver_match_device(dev, drv))
949 return 1;
950
Mika Westerberg91e56872012-10-31 22:45:02 +0100951 /* Then try ACPI style match */
952 if (acpi_driver_match_device(dev, drv))
953 return 1;
954
Grant Likely05212152010-06-08 07:48:20 -0600955 /* Then try to match against the id table */
Eric Miao57fee4a2009-02-04 11:52:40 +0800956 if (pdrv->id_table)
957 return platform_match_id(pdrv->id_table, pdev) != NULL;
958
959 /* fall-back to driver name match */
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100960 return (strcmp(pdev->name, drv->name) == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961}
962
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200963#ifdef CONFIG_PM_SLEEP
964
965static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966{
Magnus Damm783ea7d2009-06-04 22:13:33 +0200967 struct platform_driver *pdrv = to_platform_driver(dev->driver);
968 struct platform_device *pdev = to_platform_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 int ret = 0;
970
Magnus Damm783ea7d2009-06-04 22:13:33 +0200971 if (dev->driver && pdrv->suspend)
972 ret = pdrv->suspend(pdev, mesg);
David Brownell386415d82006-09-03 13:16:45 -0700973
974 return ret;
975}
976
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200977static int platform_legacy_resume(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978{
Magnus Damm783ea7d2009-06-04 22:13:33 +0200979 struct platform_driver *pdrv = to_platform_driver(dev->driver);
980 struct platform_device *pdev = to_platform_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 int ret = 0;
982
Magnus Damm783ea7d2009-06-04 22:13:33 +0200983 if (dev->driver && pdrv->resume)
984 ret = pdrv->resume(pdev);
Russell King9480e302005-10-28 09:52:56 -0700985
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 return ret;
987}
988
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200989#endif /* CONFIG_PM_SLEEP */
Magnus Damm9d730222009-08-20 20:25:32 +0200990
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200991#ifdef CONFIG_SUSPEND
992
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +0200993int platform_pm_suspend(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200994{
995 struct device_driver *drv = dev->driver;
996 int ret = 0;
997
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200998 if (!drv)
999 return 0;
1000
1001 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001002 if (drv->pm->suspend)
1003 ret = drv->pm->suspend(dev);
1004 } else {
1005 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
1006 }
1007
1008 return ret;
1009}
1010
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001011int platform_pm_resume(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001012{
1013 struct device_driver *drv = dev->driver;
1014 int ret = 0;
1015
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001016 if (!drv)
1017 return 0;
1018
1019 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001020 if (drv->pm->resume)
1021 ret = drv->pm->resume(dev);
1022 } else {
1023 ret = platform_legacy_resume(dev);
1024 }
1025
1026 return ret;
1027}
1028
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001029#endif /* CONFIG_SUSPEND */
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001030
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +02001031#ifdef CONFIG_HIBERNATE_CALLBACKS
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001032
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001033int platform_pm_freeze(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001034{
1035 struct device_driver *drv = dev->driver;
1036 int ret = 0;
1037
1038 if (!drv)
1039 return 0;
1040
1041 if (drv->pm) {
1042 if (drv->pm->freeze)
1043 ret = drv->pm->freeze(dev);
1044 } else {
1045 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
1046 }
1047
1048 return ret;
1049}
1050
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001051int platform_pm_thaw(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001052{
1053 struct device_driver *drv = dev->driver;
1054 int ret = 0;
1055
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001056 if (!drv)
1057 return 0;
1058
1059 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001060 if (drv->pm->thaw)
1061 ret = drv->pm->thaw(dev);
1062 } else {
1063 ret = platform_legacy_resume(dev);
1064 }
1065
1066 return ret;
1067}
1068
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001069int platform_pm_poweroff(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001070{
1071 struct device_driver *drv = dev->driver;
1072 int ret = 0;
1073
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001074 if (!drv)
1075 return 0;
1076
1077 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001078 if (drv->pm->poweroff)
1079 ret = drv->pm->poweroff(dev);
1080 } else {
1081 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
1082 }
1083
1084 return ret;
1085}
1086
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001087int platform_pm_restore(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001088{
1089 struct device_driver *drv = dev->driver;
1090 int ret = 0;
1091
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001092 if (!drv)
1093 return 0;
1094
1095 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001096 if (drv->pm->restore)
1097 ret = drv->pm->restore(dev);
1098 } else {
1099 ret = platform_legacy_resume(dev);
1100 }
1101
1102 return ret;
1103}
1104
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001105#endif /* CONFIG_HIBERNATE_CALLBACKS */
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001106
Dmitry Torokhovd9ab7712009-07-22 00:37:25 +02001107static const struct dev_pm_ops platform_dev_pm_ops = {
Rafael J. Wysocki8b313a32011-04-29 00:36:32 +02001108 .runtime_suspend = pm_generic_runtime_suspend,
1109 .runtime_resume = pm_generic_runtime_resume,
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001110 USE_PLATFORM_PM_SLEEP_OPS
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001111};
1112
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113struct bus_type platform_bus_type = {
1114 .name = "platform",
Greg Kroah-Hartmand06262e2013-08-23 14:24:37 -07001115 .dev_groups = platform_dev_groups,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 .match = platform_match,
David Brownella0245f72006-05-29 10:37:33 -07001117 .uevent = platform_uevent,
Magnus Damm9d730222009-08-20 20:25:32 +02001118 .pm = &platform_dev_pm_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119};
Dmitry Torokhova96b2042005-12-10 01:36:28 -05001120EXPORT_SYMBOL_GPL(platform_bus_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121
1122int __init platform_bus_init(void)
1123{
Cornelia Huckfbfb1442006-11-27 10:35:08 +01001124 int error;
1125
Magnus Damm13977092009-03-30 14:37:25 -07001126 early_platform_cleanup();
1127
Cornelia Huckfbfb1442006-11-27 10:35:08 +01001128 error = device_register(&platform_bus);
1129 if (error)
1130 return error;
1131 error = bus_register(&platform_bus_type);
1132 if (error)
1133 device_unregister(&platform_bus);
Pantelis Antoniou801d7282014-10-28 22:36:01 +02001134 of_platform_register_reconfig_notifier();
Cornelia Huckfbfb1442006-11-27 10:35:08 +01001135 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136}
1137
1138#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1139u64 dma_get_required_mask(struct device *dev)
1140{
1141 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
1142 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
1143 u64 mask;
1144
1145 if (!high_totalram) {
1146 /* convert to mask just covering totalram */
1147 low_totalram = (1 << (fls(low_totalram) - 1));
1148 low_totalram += low_totalram - 1;
1149 mask = low_totalram;
1150 } else {
1151 high_totalram = (1 << (fls(high_totalram) - 1));
1152 high_totalram += high_totalram - 1;
1153 mask = (((u64)high_totalram) << 32) + 0xffffffff;
1154 }
James Bottomleye88a0c22008-03-09 11:57:56 -05001155 return mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156}
1157EXPORT_SYMBOL_GPL(dma_get_required_mask);
1158#endif
Magnus Damm13977092009-03-30 14:37:25 -07001159
1160static __initdata LIST_HEAD(early_platform_driver_list);
1161static __initdata LIST_HEAD(early_platform_device_list);
1162
1163/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001164 * early_platform_driver_register - register early platform driver
Randy Dunlapd86c1302009-04-21 07:22:53 -07001165 * @epdrv: early_platform driver structure
Magnus Damm13977092009-03-30 14:37:25 -07001166 * @buf: string passed from early_param()
Magnus Damm4d26e1392010-03-10 20:50:38 +09001167 *
1168 * Helper function for early_platform_init() / early_platform_init_buffer()
Magnus Damm13977092009-03-30 14:37:25 -07001169 */
1170int __init early_platform_driver_register(struct early_platform_driver *epdrv,
1171 char *buf)
1172{
Magnus Dammc60e0502009-11-27 17:38:51 +09001173 char *tmp;
Magnus Damm13977092009-03-30 14:37:25 -07001174 int n;
1175
1176 /* Simply add the driver to the end of the global list.
1177 * Drivers will by default be put on the list in compiled-in order.
1178 */
1179 if (!epdrv->list.next) {
1180 INIT_LIST_HEAD(&epdrv->list);
1181 list_add_tail(&epdrv->list, &early_platform_driver_list);
1182 }
1183
1184 /* If the user has specified device then make sure the driver
1185 * gets prioritized. The driver of the last device specified on
1186 * command line will be put first on the list.
1187 */
1188 n = strlen(epdrv->pdrv->driver.name);
1189 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1190 list_move(&epdrv->list, &early_platform_driver_list);
1191
Magnus Dammc60e0502009-11-27 17:38:51 +09001192 /* Allow passing parameters after device name */
1193 if (buf[n] == '\0' || buf[n] == ',')
Magnus Damm13977092009-03-30 14:37:25 -07001194 epdrv->requested_id = -1;
Magnus Dammc60e0502009-11-27 17:38:51 +09001195 else {
1196 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1197 &tmp, 10);
1198
1199 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1200 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1201 n = 0;
1202 } else
1203 n += strcspn(&buf[n + 1], ",") + 1;
1204 }
1205
1206 if (buf[n] == ',')
1207 n++;
1208
1209 if (epdrv->bufsize) {
1210 memcpy(epdrv->buffer, &buf[n],
1211 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1212 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1213 }
Magnus Damm13977092009-03-30 14:37:25 -07001214 }
1215
1216 return 0;
1217}
1218
1219/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001220 * early_platform_add_devices - adds a number of early platform devices
Magnus Damm13977092009-03-30 14:37:25 -07001221 * @devs: array of early platform devices to add
1222 * @num: number of early platform devices in array
Magnus Damm4d26e1392010-03-10 20:50:38 +09001223 *
1224 * Used by early architecture code to register early platform devices and
1225 * their platform data.
Magnus Damm13977092009-03-30 14:37:25 -07001226 */
1227void __init early_platform_add_devices(struct platform_device **devs, int num)
1228{
1229 struct device *dev;
1230 int i;
1231
1232 /* simply add the devices to list */
1233 for (i = 0; i < num; i++) {
1234 dev = &devs[i]->dev;
1235
1236 if (!dev->devres_head.next) {
Rafael J. Wysockibed2b422012-08-06 01:45:11 +02001237 pm_runtime_early_init(dev);
Magnus Damm13977092009-03-30 14:37:25 -07001238 INIT_LIST_HEAD(&dev->devres_head);
1239 list_add_tail(&dev->devres_head,
1240 &early_platform_device_list);
1241 }
1242 }
1243}
1244
1245/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001246 * early_platform_driver_register_all - register early platform drivers
Magnus Damm13977092009-03-30 14:37:25 -07001247 * @class_str: string to identify early platform driver class
Magnus Damm4d26e1392010-03-10 20:50:38 +09001248 *
1249 * Used by architecture code to register all early platform drivers
1250 * for a certain class. If omitted then only early platform drivers
1251 * with matching kernel command line class parameters will be registered.
Magnus Damm13977092009-03-30 14:37:25 -07001252 */
1253void __init early_platform_driver_register_all(char *class_str)
1254{
1255 /* The "class_str" parameter may or may not be present on the kernel
1256 * command line. If it is present then there may be more than one
1257 * matching parameter.
1258 *
1259 * Since we register our early platform drivers using early_param()
1260 * we need to make sure that they also get registered in the case
1261 * when the parameter is missing from the kernel command line.
1262 *
1263 * We use parse_early_options() to make sure the early_param() gets
1264 * called at least once. The early_param() may be called more than
1265 * once since the name of the preferred device may be specified on
1266 * the kernel command line. early_platform_driver_register() handles
1267 * this case for us.
1268 */
1269 parse_early_options(class_str);
1270}
1271
1272/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001273 * early_platform_match - find early platform device matching driver
Randy Dunlapd86c1302009-04-21 07:22:53 -07001274 * @epdrv: early platform driver structure
Magnus Damm13977092009-03-30 14:37:25 -07001275 * @id: id to match against
1276 */
Hanjun Guoa8257912013-08-17 20:42:25 +08001277static struct platform_device * __init
Magnus Damm13977092009-03-30 14:37:25 -07001278early_platform_match(struct early_platform_driver *epdrv, int id)
1279{
1280 struct platform_device *pd;
1281
1282 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1283 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1284 if (pd->id == id)
1285 return pd;
1286
1287 return NULL;
1288}
1289
1290/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001291 * early_platform_left - check if early platform driver has matching devices
Randy Dunlapd86c1302009-04-21 07:22:53 -07001292 * @epdrv: early platform driver structure
Magnus Damm13977092009-03-30 14:37:25 -07001293 * @id: return true if id or above exists
1294 */
Hanjun Guoa8257912013-08-17 20:42:25 +08001295static int __init early_platform_left(struct early_platform_driver *epdrv,
Magnus Damm13977092009-03-30 14:37:25 -07001296 int id)
1297{
1298 struct platform_device *pd;
1299
1300 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1301 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1302 if (pd->id >= id)
1303 return 1;
1304
1305 return 0;
1306}
1307
1308/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001309 * early_platform_driver_probe_id - probe drivers matching class_str and id
Magnus Damm13977092009-03-30 14:37:25 -07001310 * @class_str: string to identify early platform driver class
1311 * @id: id to match against
1312 * @nr_probe: number of platform devices to successfully probe before exiting
1313 */
1314static int __init early_platform_driver_probe_id(char *class_str,
1315 int id,
1316 int nr_probe)
1317{
1318 struct early_platform_driver *epdrv;
1319 struct platform_device *match;
1320 int match_id;
1321 int n = 0;
1322 int left = 0;
1323
1324 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1325 /* only use drivers matching our class_str */
1326 if (strcmp(class_str, epdrv->class_str))
1327 continue;
1328
1329 if (id == -2) {
1330 match_id = epdrv->requested_id;
1331 left = 1;
1332
1333 } else {
1334 match_id = id;
1335 left += early_platform_left(epdrv, id);
1336
1337 /* skip requested id */
1338 switch (epdrv->requested_id) {
1339 case EARLY_PLATFORM_ID_ERROR:
1340 case EARLY_PLATFORM_ID_UNSET:
1341 break;
1342 default:
1343 if (epdrv->requested_id == id)
1344 match_id = EARLY_PLATFORM_ID_UNSET;
1345 }
1346 }
1347
1348 switch (match_id) {
1349 case EARLY_PLATFORM_ID_ERROR:
Fabio Porcedda0258e182013-03-26 10:35:16 +01001350 pr_warn("%s: unable to parse %s parameter\n",
1351 class_str, epdrv->pdrv->driver.name);
Magnus Damm13977092009-03-30 14:37:25 -07001352 /* fall-through */
1353 case EARLY_PLATFORM_ID_UNSET:
1354 match = NULL;
1355 break;
1356 default:
1357 match = early_platform_match(epdrv, match_id);
1358 }
1359
1360 if (match) {
Paul Mundta636ee72010-03-09 06:57:53 +00001361 /*
1362 * Set up a sensible init_name to enable
1363 * dev_name() and others to be used before the
1364 * rest of the driver core is initialized.
1365 */
Paul Mundt06fe53b2010-05-13 17:56:56 +09001366 if (!match->dev.init_name && slab_is_available()) {
Paul Mundta636ee72010-03-09 06:57:53 +00001367 if (match->id != -1)
Paul Mundtbd050862010-03-29 15:51:35 +09001368 match->dev.init_name =
1369 kasprintf(GFP_KERNEL, "%s.%d",
1370 match->name,
1371 match->id);
Paul Mundta636ee72010-03-09 06:57:53 +00001372 else
Paul Mundtbd050862010-03-29 15:51:35 +09001373 match->dev.init_name =
1374 kasprintf(GFP_KERNEL, "%s",
1375 match->name);
Paul Mundta636ee72010-03-09 06:57:53 +00001376
Paul Mundta636ee72010-03-09 06:57:53 +00001377 if (!match->dev.init_name)
1378 return -ENOMEM;
1379 }
Paul Mundtbd050862010-03-29 15:51:35 +09001380
Magnus Damm13977092009-03-30 14:37:25 -07001381 if (epdrv->pdrv->probe(match))
Fabio Porcedda0258e182013-03-26 10:35:16 +01001382 pr_warn("%s: unable to probe %s early.\n",
1383 class_str, match->name);
Magnus Damm13977092009-03-30 14:37:25 -07001384 else
1385 n++;
1386 }
1387
1388 if (n >= nr_probe)
1389 break;
1390 }
1391
1392 if (left)
1393 return n;
1394 else
1395 return -ENODEV;
1396}
1397
1398/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001399 * early_platform_driver_probe - probe a class of registered drivers
Magnus Damm13977092009-03-30 14:37:25 -07001400 * @class_str: string to identify early platform driver class
1401 * @nr_probe: number of platform devices to successfully probe before exiting
1402 * @user_only: only probe user specified early platform devices
Magnus Damm4d26e1392010-03-10 20:50:38 +09001403 *
1404 * Used by architecture code to probe registered early platform drivers
1405 * within a certain class. For probe to happen a registered early platform
1406 * device matching a registered early platform driver is needed.
Magnus Damm13977092009-03-30 14:37:25 -07001407 */
1408int __init early_platform_driver_probe(char *class_str,
1409 int nr_probe,
1410 int user_only)
1411{
1412 int k, n, i;
1413
1414 n = 0;
1415 for (i = -2; n < nr_probe; i++) {
1416 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1417
1418 if (k < 0)
1419 break;
1420
1421 n += k;
1422
1423 if (user_only)
1424 break;
1425 }
1426
1427 return n;
1428}
1429
1430/**
1431 * early_platform_cleanup - clean up early platform code
1432 */
1433void __init early_platform_cleanup(void)
1434{
1435 struct platform_device *pd, *pd2;
1436
1437 /* clean up the devres list used to chain devices */
1438 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1439 dev.devres_head) {
1440 list_del(&pd->dev.devres_head);
1441 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));
1442 }
1443}
1444