blob: 5eba47815bb6411c94999d6aa24fa3856553d31b [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);
Sergei Shtylyove330b9a2016-07-04 01:04:24 +0300100 if (ret > 0 || ret == -EPROBE_DEFER)
Guenter Roeckaff008a2014-06-17 15:51:02 -0700101 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 */
Guenter Roeck60ca5e02016-09-13 20:32:44 -0700111 if (r && r->flags & IORESOURCE_BITS) {
112 struct irq_data *irqd;
113
114 irqd = irq_get_irq_data(r->start);
115 if (!irqd)
116 return -ENXIO;
117 irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS);
118 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
David Vrabel305b3222006-01-19 17:52:27 +0000120 return r ? r->start : -ENXIO;
Andreas Larsson5cf8f7d2012-10-29 23:26:56 +0000121#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500123EXPORT_SYMBOL_GPL(platform_get_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
125/**
Stephen Boyd4b835552016-01-06 17:12:47 -0800126 * platform_irq_count - Count the number of IRQs a platform device uses
127 * @dev: platform device
128 *
129 * Return: Number of IRQs a platform device uses or EPROBE_DEFER
130 */
131int platform_irq_count(struct platform_device *dev)
132{
133 int ret, nr = 0;
134
135 while ((ret = platform_get_irq(dev, nr)) >= 0)
136 nr++;
137
138 if (ret == -EPROBE_DEFER)
139 return ret;
140
141 return nr;
142}
143EXPORT_SYMBOL_GPL(platform_irq_count);
144
145/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800146 * platform_get_resource_byname - get a resource for a device by name
147 * @dev: platform device
148 * @type: resource type
149 * @name: resource name
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800151struct resource *platform_get_resource_byname(struct platform_device *dev,
Linus Walleijc0afe7b2009-04-27 02:38:16 +0200152 unsigned int type,
153 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154{
155 int i;
156
157 for (i = 0; i < dev->num_resources; i++) {
158 struct resource *r = &dev->resource[i];
159
Peter Ujfalusi1b8cb922012-08-23 17:10:00 +0300160 if (unlikely(!r->name))
161 continue;
162
Magnus Dammc9f66162008-10-15 22:05:15 -0700163 if (type == resource_type(r) && !strcmp(r->name, name))
164 return r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 }
166 return NULL;
167}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500168EXPORT_SYMBOL_GPL(platform_get_resource_byname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
170/**
Wolfram Sangd6ff8552012-11-13 17:47:13 +0100171 * platform_get_irq_byname - get an IRQ for a device by name
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800172 * @dev: platform device
173 * @name: IRQ name
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 */
Linus Walleijc0afe7b2009-04-27 02:38:16 +0200175int platform_get_irq_byname(struct platform_device *dev, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176{
Grygorii Strashkoad696742014-05-20 13:42:02 +0300177 struct resource *r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
Guenter Roeckaff008a2014-06-17 15:51:02 -0700179 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
180 int ret;
181
182 ret = of_irq_get_byname(dev->dev.of_node, name);
Sergei Shtylyove330b9a2016-07-04 01:04:24 +0300183 if (ret > 0 || ret == -EPROBE_DEFER)
Guenter Roeckaff008a2014-06-17 15:51:02 -0700184 return ret;
185 }
Grygorii Strashkoad696742014-05-20 13:42:02 +0300186
187 r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
David Vrabel305b3222006-01-19 17:52:27 +0000188 return r ? r->start : -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500190EXPORT_SYMBOL_GPL(platform_get_irq_byname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
192/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800193 * platform_add_devices - add a numbers of platform devices
194 * @devs: array of platform devices to add
195 * @num: number of platform devices in array
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 */
197int platform_add_devices(struct platform_device **devs, int num)
198{
199 int i, ret = 0;
200
201 for (i = 0; i < num; i++) {
202 ret = platform_device_register(devs[i]);
203 if (ret) {
204 while (--i >= 0)
205 platform_device_unregister(devs[i]);
206 break;
207 }
208 }
209
210 return ret;
211}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500212EXPORT_SYMBOL_GPL(platform_add_devices);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
Russell King37c12e72005-11-05 21:19:33 +0000214struct platform_object {
215 struct platform_device pdev;
Yann Droneaud1cec24c2014-05-30 22:02:47 +0200216 char name[];
Russell King37c12e72005-11-05 21:19:33 +0000217};
218
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000220 * platform_device_put - destroy a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800221 * @pdev: platform device to free
Russell King37c12e72005-11-05 21:19:33 +0000222 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800223 * Free all memory associated with a platform device. This function must
224 * _only_ be externally called in error cases. All other usage is a bug.
Russell King37c12e72005-11-05 21:19:33 +0000225 */
226void platform_device_put(struct platform_device *pdev)
227{
228 if (pdev)
229 put_device(&pdev->dev);
230}
231EXPORT_SYMBOL_GPL(platform_device_put);
232
233static void platform_device_release(struct device *dev)
234{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800235 struct platform_object *pa = container_of(dev, struct platform_object,
236 pdev.dev);
Russell King37c12e72005-11-05 21:19:33 +0000237
Grant Likely7096d042010-10-20 11:45:13 -0600238 of_device_node_put(&pa->pdev.dev);
Russell King37c12e72005-11-05 21:19:33 +0000239 kfree(pa->pdev.dev.platform_data);
Samuel Ortize710d7d2011-04-08 00:43:01 +0200240 kfree(pa->pdev.mfd_cell);
Russell King37c12e72005-11-05 21:19:33 +0000241 kfree(pa->pdev.resource);
Kim Phillips3d713e02014-06-02 19:42:58 -0500242 kfree(pa->pdev.driver_override);
Russell King37c12e72005-11-05 21:19:33 +0000243 kfree(pa);
244}
245
246/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000247 * platform_device_alloc - create a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800248 * @name: base name of the device we're adding
249 * @id: instance id
Russell King37c12e72005-11-05 21:19:33 +0000250 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800251 * Create a platform device object which can have other objects attached
252 * to it, and which will have attached objects freed when it is released.
Russell King37c12e72005-11-05 21:19:33 +0000253 */
Jean Delvare1359555e2007-09-09 12:54:16 +0200254struct platform_device *platform_device_alloc(const char *name, int id)
Russell King37c12e72005-11-05 21:19:33 +0000255{
256 struct platform_object *pa;
257
Yann Droneaud1cec24c2014-05-30 22:02:47 +0200258 pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL);
Russell King37c12e72005-11-05 21:19:33 +0000259 if (pa) {
260 strcpy(pa->name, name);
261 pa->pdev.name = pa->name;
262 pa->pdev.id = id;
263 device_initialize(&pa->pdev.dev);
264 pa->pdev.dev.release = platform_device_release;
Kumar Galaa77ce812011-06-10 01:52:57 -0500265 arch_setup_pdev_archdata(&pa->pdev);
Russell King37c12e72005-11-05 21:19:33 +0000266 }
267
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500268 return pa ? &pa->pdev : NULL;
Russell King37c12e72005-11-05 21:19:33 +0000269}
270EXPORT_SYMBOL_GPL(platform_device_alloc);
271
272/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000273 * platform_device_add_resources - add resources to a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800274 * @pdev: platform device allocated by platform_device_alloc to add resources to
275 * @res: set of resources that needs to be allocated for the device
276 * @num: number of resources
Russell King37c12e72005-11-05 21:19:33 +0000277 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800278 * Add a copy of the resources to the platform device. The memory
279 * associated with the resources will be freed when the platform device is
280 * released.
Russell King37c12e72005-11-05 21:19:33 +0000281 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800282int platform_device_add_resources(struct platform_device *pdev,
Geert Uytterhoeven0b7f1a72009-01-28 21:01:02 +0100283 const struct resource *res, unsigned int num)
Russell King37c12e72005-11-05 21:19:33 +0000284{
Uwe Kleine-Königcea89622011-04-20 09:44:44 +0200285 struct resource *r = NULL;
Russell King37c12e72005-11-05 21:19:33 +0000286
Uwe Kleine-Königcea89622011-04-20 09:44:44 +0200287 if (res) {
288 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
289 if (!r)
290 return -ENOMEM;
Russell King37c12e72005-11-05 21:19:33 +0000291 }
Uwe Kleine-Königcea89622011-04-20 09:44:44 +0200292
Uwe Kleine-König4a03d6f2011-04-20 09:44:45 +0200293 kfree(pdev->resource);
Uwe Kleine-Königcea89622011-04-20 09:44:44 +0200294 pdev->resource = r;
295 pdev->num_resources = num;
296 return 0;
Russell King37c12e72005-11-05 21:19:33 +0000297}
298EXPORT_SYMBOL_GPL(platform_device_add_resources);
299
300/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000301 * platform_device_add_data - add platform-specific data to a platform device
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800302 * @pdev: platform device allocated by platform_device_alloc to add resources to
303 * @data: platform specific data for this platform device
304 * @size: size of platform specific data
Russell King37c12e72005-11-05 21:19:33 +0000305 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800306 * Add a copy of platform specific data to the platform device's
307 * platform_data pointer. The memory associated with the platform data
308 * will be freed when the platform device is released.
Russell King37c12e72005-11-05 21:19:33 +0000309 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800310int platform_device_add_data(struct platform_device *pdev, const void *data,
311 size_t size)
Russell King37c12e72005-11-05 21:19:33 +0000312{
Uwe Kleine-König27a33f92011-04-20 09:44:42 +0200313 void *d = NULL;
Russell King37c12e72005-11-05 21:19:33 +0000314
Uwe Kleine-König27a33f92011-04-20 09:44:42 +0200315 if (data) {
316 d = kmemdup(data, size, GFP_KERNEL);
317 if (!d)
318 return -ENOMEM;
Russell King37c12e72005-11-05 21:19:33 +0000319 }
Uwe Kleine-König27a33f92011-04-20 09:44:42 +0200320
Uwe Kleine-König251e0312011-04-20 09:44:43 +0200321 kfree(pdev->dev.platform_data);
Uwe Kleine-König27a33f92011-04-20 09:44:42 +0200322 pdev->dev.platform_data = d;
323 return 0;
Russell King37c12e72005-11-05 21:19:33 +0000324}
325EXPORT_SYMBOL_GPL(platform_device_add_data);
326
327/**
Mika Westerberg00bbc1d2015-11-30 17:11:38 +0200328 * platform_device_add_properties - add built-in properties to a platform device
329 * @pdev: platform device to add properties to
Heikki Krogerusf4d05262016-03-29 14:52:23 +0300330 * @properties: null terminated array of properties to add
Mika Westerberg00bbc1d2015-11-30 17:11:38 +0200331 *
Heikki Krogerusf4d05262016-03-29 14:52:23 +0300332 * The function will take deep copy of @properties and attach the copy to the
333 * platform device. The memory associated with properties will be freed when the
334 * platform device is released.
Mika Westerberg00bbc1d2015-11-30 17:11:38 +0200335 */
336int platform_device_add_properties(struct platform_device *pdev,
Heikki Krogerusf4d05262016-03-29 14:52:23 +0300337 struct property_entry *properties)
Mika Westerberg00bbc1d2015-11-30 17:11:38 +0200338{
Heikki Krogerusf4d05262016-03-29 14:52:23 +0300339 return device_add_properties(&pdev->dev, properties);
Mika Westerberg00bbc1d2015-11-30 17:11:38 +0200340}
341EXPORT_SYMBOL_GPL(platform_device_add_properties);
342
343/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800344 * platform_device_add - add a platform device to device hierarchy
345 * @pdev: platform device we're adding
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800347 * This is part 2 of platform_device_register(), though may be called
348 * separately _iff_ pdev was allocated by platform_device_alloc().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 */
Russell King37c12e72005-11-05 21:19:33 +0000350int platform_device_add(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351{
Jean Delvare689ae232012-07-27 22:14:59 +0200352 int i, ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
354 if (!pdev)
355 return -EINVAL;
356
357 if (!pdev->dev.parent)
358 pdev->dev.parent = &platform_bus;
359
360 pdev->dev.bus = &platform_bus_type;
361
Jean Delvare689ae232012-07-27 22:14:59 +0200362 switch (pdev->id) {
363 default:
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100364 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
Jean Delvare689ae232012-07-27 22:14:59 +0200365 break;
366 case PLATFORM_DEVID_NONE:
Greg Kroah-Hartmanacc0e902009-06-02 15:39:55 -0700367 dev_set_name(&pdev->dev, "%s", pdev->name);
Jean Delvare689ae232012-07-27 22:14:59 +0200368 break;
369 case PLATFORM_DEVID_AUTO:
370 /*
371 * Automatically allocated device ID. We mark it as such so
372 * that we remember it must be freed, and we append a suffix
373 * to avoid namespace collision with explicit IDs.
374 */
375 ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL);
376 if (ret < 0)
Greg Kroah-Hartman5da7f702015-06-10 08:38:02 -0700377 goto err_out;
Jean Delvare689ae232012-07-27 22:14:59 +0200378 pdev->id = ret;
379 pdev->id_auto = true;
380 dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
381 break;
382 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
384 for (i = 0; i < pdev->num_resources; i++) {
Greg Kroah-Hartman5da7f702015-06-10 08:38:02 -0700385 struct resource *p, *r = &pdev->resource[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
387 if (r->name == NULL)
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100388 r->name = dev_name(&pdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
390 p = r->parent;
391 if (!p) {
Greg Kroah-Hartman0e6c8612015-06-10 08:38:29 -0700392 if (resource_type(r) == IORESOURCE_MEM)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 p = &iomem_resource;
Greg Kroah-Hartman0e6c8612015-06-10 08:38:29 -0700394 else if (resource_type(r) == IORESOURCE_IO)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 p = &ioport_resource;
396 }
397
Greg Kroah-Hartman0e6c8612015-06-10 08:38:29 -0700398 if (p && insert_resource(p, r)) {
Greg Kroah-Hartman5da7f702015-06-10 08:38:02 -0700399 dev_err(&pdev->dev, "failed to claim resource %d\n", i);
400 ret = -EBUSY;
401 goto failed;
402 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 }
404
405 pr_debug("Registering platform device '%s'. Parent at %s\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100406 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
Russell Kinge3915532006-05-06 08:15:26 +0100408 ret = device_add(&pdev->dev);
Greg Kroah-Hartman8b2dceb2015-06-10 08:36:50 -0700409 if (ret == 0)
410 return ret;
411
Greg Kroah-Hartman5da7f702015-06-10 08:38:02 -0700412 failed:
Greg Kroah-Hartman8b2dceb2015-06-10 08:36:50 -0700413 if (pdev->id_auto) {
414 ida_simple_remove(&platform_devid_ida, pdev->id);
415 pdev->id = PLATFORM_DEVID_AUTO;
416 }
417
418 while (--i >= 0) {
419 struct resource *r = &pdev->resource[i];
Grant Likely7f5dcaf2015-06-07 15:20:11 +0100420 if (r->parent)
Greg Kroah-Hartman8b2dceb2015-06-10 08:36:50 -0700421 release_resource(r);
422 }
Magnus Dammc9f66162008-10-15 22:05:15 -0700423
Greg Kroah-Hartman5da7f702015-06-10 08:38:02 -0700424 err_out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 return ret;
426}
Russell King37c12e72005-11-05 21:19:33 +0000427EXPORT_SYMBOL_GPL(platform_device_add);
428
429/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800430 * platform_device_del - remove a platform-level device
431 * @pdev: platform device we're removing
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500432 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800433 * Note that this function will also release all memory- and port-based
434 * resources owned by the device (@dev->resource). This function must
435 * _only_ be externally called in error cases. All other usage is a bug.
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500436 */
437void platform_device_del(struct platform_device *pdev)
438{
Greg Kroah-Hartman8b2dceb2015-06-10 08:36:50 -0700439 int i;
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500440
Greg Kroah-Hartman8b2dceb2015-06-10 08:36:50 -0700441 if (pdev) {
Jerome Marchandc90aab92016-07-25 16:13:32 +0200442 device_remove_properties(&pdev->dev);
Greg Kroah-Hartman8b2dceb2015-06-10 08:36:50 -0700443 device_del(&pdev->dev);
444
445 if (pdev->id_auto) {
446 ida_simple_remove(&platform_devid_ida, pdev->id);
447 pdev->id = PLATFORM_DEVID_AUTO;
448 }
449
450 for (i = 0; i < pdev->num_resources; i++) {
451 struct resource *r = &pdev->resource[i];
Grant Likely7f5dcaf2015-06-07 15:20:11 +0100452 if (r->parent)
Greg Kroah-Hartman8b2dceb2015-06-10 08:36:50 -0700453 release_resource(r);
454 }
455 }
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500456}
457EXPORT_SYMBOL_GPL(platform_device_del);
458
459/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800460 * platform_device_register - add a platform-level device
461 * @pdev: platform device we're adding
Russell King37c12e72005-11-05 21:19:33 +0000462 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800463int platform_device_register(struct platform_device *pdev)
Russell King37c12e72005-11-05 21:19:33 +0000464{
465 device_initialize(&pdev->dev);
Kumar Galaa77ce812011-06-10 01:52:57 -0500466 arch_setup_pdev_archdata(pdev);
Russell King37c12e72005-11-05 21:19:33 +0000467 return platform_device_add(pdev);
468}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500469EXPORT_SYMBOL_GPL(platform_device_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
471/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800472 * platform_device_unregister - unregister a platform-level device
473 * @pdev: platform device we're unregistering
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800475 * Unregistration is done in 2 steps. First we release all resources
476 * and remove it from the subsystem, then we drop reference count by
477 * calling platform_device_put().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800479void platform_device_unregister(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480{
Dmitry Torokhov93ce3062005-12-10 01:36:27 -0500481 platform_device_del(pdev);
482 platform_device_put(pdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483}
Dmitry Torokhova96b2042005-12-10 01:36:28 -0500484EXPORT_SYMBOL_GPL(platform_device_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486/**
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200487 * platform_device_register_full - add a platform-level device with
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200488 * resources and platform-specific data
489 *
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200490 * @pdevinfo: data used to create device
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700491 *
Jani Nikulaf0eae0e2010-03-11 18:11:45 +0200492 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700493 */
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200494struct platform_device *platform_device_register_full(
Uwe Kleine-König5a3072b2011-12-08 22:53:29 +0100495 const struct platform_device_info *pdevinfo)
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700496{
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200497 int ret = -ENOMEM;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700498 struct platform_device *pdev;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700499
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200500 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200501 if (!pdev)
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200502 goto err_alloc;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700503
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200504 pdev->dev.parent = pdevinfo->parent;
Rafael J. Wysockice793482015-03-16 23:49:03 +0100505 pdev->dev.fwnode = pdevinfo->fwnode;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700506
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200507 if (pdevinfo->dma_mask) {
508 /*
509 * This memory isn't freed when the device is put,
510 * I don't have a nice idea for that though. Conceptually
511 * dma_mask in struct device should not be a pointer.
512 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
513 */
514 pdev->dev.dma_mask =
515 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
516 if (!pdev->dev.dma_mask)
517 goto err;
518
519 *pdev->dev.dma_mask = pdevinfo->dma_mask;
520 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
521 }
522
523 ret = platform_device_add_resources(pdev,
524 pdevinfo->res, pdevinfo->num_res);
Anton Vorontsov807508c2010-09-07 17:31:54 +0400525 if (ret)
526 goto err;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700527
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200528 ret = platform_device_add_data(pdev,
529 pdevinfo->data, pdevinfo->size_data);
Anton Vorontsov807508c2010-09-07 17:31:54 +0400530 if (ret)
531 goto err;
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200532
Heikki Krogerusf4d05262016-03-29 14:52:23 +0300533 if (pdevinfo->properties) {
534 ret = platform_device_add_properties(pdev,
535 pdevinfo->properties);
Mika Westerberg00bbc1d2015-11-30 17:11:38 +0200536 if (ret)
537 goto err;
538 }
539
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200540 ret = platform_device_add(pdev);
541 if (ret) {
542err:
Rafael J. Wysocki7b199812013-11-11 22:41:56 +0100543 ACPI_COMPANION_SET(&pdev->dev, NULL);
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200544 kfree(pdev->dev.dma_mask);
545
546err_alloc:
Uwe Kleine-König44f28bd2010-06-21 16:11:44 +0200547 platform_device_put(pdev);
548 return ERR_PTR(ret);
549 }
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700550
551 return pdev;
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700552}
Uwe Kleine-König01dcc602011-08-25 11:16:00 +0200553EXPORT_SYMBOL_GPL(platform_device_register_full);
Dmitry Baryshkovd8bf2542008-09-22 14:41:40 -0700554
Russell King00d3dcd2005-11-09 17:23:39 +0000555static int platform_drv_probe(struct device *_dev)
556{
557 struct platform_driver *drv = to_platform_driver(_dev->driver);
558 struct platform_device *dev = to_platform_device(_dev);
Rafael J. Wysocki94d76d52012-11-26 10:04:53 +0100559 int ret;
Russell King00d3dcd2005-11-09 17:23:39 +0000560
Sylwester Nawrocki86be4082014-06-18 17:29:32 +0200561 ret = of_clk_set_defaults(_dev->of_node, false);
562 if (ret < 0)
563 return ret;
564
Ulf Hanssoncb518412014-09-19 20:27:38 +0200565 ret = dev_pm_domain_attach(_dev, true);
Martin Wilck25cad692015-11-30 12:50:05 +0100566 if (ret != -EPROBE_DEFER) {
567 if (drv->probe) {
568 ret = drv->probe(dev);
569 if (ret)
570 dev_pm_domain_detach(_dev, true);
571 } else {
572 /* don't fail if just dev_pm_domain_attach failed */
573 ret = 0;
574 }
Ulf Hanssoncb518412014-09-19 20:27:38 +0200575 }
Rafael J. Wysocki94d76d52012-11-26 10:04:53 +0100576
Johan Hovold3f9120b2013-09-23 16:27:26 +0200577 if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) {
578 dev_warn(_dev, "probe deferral not supported\n");
579 ret = -ENXIO;
580 }
581
Rafael J. Wysocki94d76d52012-11-26 10:04:53 +0100582 return ret;
Russell King00d3dcd2005-11-09 17:23:39 +0000583}
584
David Brownellc67334f2006-11-16 23:28:47 -0800585static int platform_drv_probe_fail(struct device *_dev)
586{
587 return -ENXIO;
588}
589
Russell King00d3dcd2005-11-09 17:23:39 +0000590static int platform_drv_remove(struct device *_dev)
591{
592 struct platform_driver *drv = to_platform_driver(_dev->driver);
593 struct platform_device *dev = to_platform_device(_dev);
Uwe Kleine-Königb8b2c7d2015-08-07 07:19:22 +0200594 int ret = 0;
Russell King00d3dcd2005-11-09 17:23:39 +0000595
Uwe Kleine-Königb8b2c7d2015-08-07 07:19:22 +0200596 if (drv->remove)
597 ret = drv->remove(dev);
Ulf Hanssoncb518412014-09-19 20:27:38 +0200598 dev_pm_domain_detach(_dev, true);
Rafael J. Wysocki94d76d52012-11-26 10:04:53 +0100599
600 return ret;
Russell King00d3dcd2005-11-09 17:23:39 +0000601}
602
603static void platform_drv_shutdown(struct device *_dev)
604{
605 struct platform_driver *drv = to_platform_driver(_dev->driver);
606 struct platform_device *dev = to_platform_device(_dev);
607
Uwe Kleine-Königb8b2c7d2015-08-07 07:19:22 +0200608 if (drv->shutdown)
609 drv->shutdown(dev);
Russell King00d3dcd2005-11-09 17:23:39 +0000610}
611
Russell King00d3dcd2005-11-09 17:23:39 +0000612/**
Libo Chen94470572013-05-25 12:40:50 +0800613 * __platform_driver_register - register a driver for platform-level devices
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800614 * @drv: platform driver structure
Randy Dunlap08801f92013-07-14 17:43:06 -0700615 * @owner: owning module/driver
Russell King00d3dcd2005-11-09 17:23:39 +0000616 */
Libo Chen94470572013-05-25 12:40:50 +0800617int __platform_driver_register(struct platform_driver *drv,
618 struct module *owner)
Russell King00d3dcd2005-11-09 17:23:39 +0000619{
Libo Chen94470572013-05-25 12:40:50 +0800620 drv->driver.owner = owner;
Russell King00d3dcd2005-11-09 17:23:39 +0000621 drv->driver.bus = &platform_bus_type;
Uwe Kleine-Königb8b2c7d2015-08-07 07:19:22 +0200622 drv->driver.probe = platform_drv_probe;
623 drv->driver.remove = platform_drv_remove;
624 drv->driver.shutdown = platform_drv_shutdown;
Magnus Damm783ea7d2009-06-04 22:13:33 +0200625
Russell King00d3dcd2005-11-09 17:23:39 +0000626 return driver_register(&drv->driver);
627}
Libo Chen94470572013-05-25 12:40:50 +0800628EXPORT_SYMBOL_GPL(__platform_driver_register);
Russell King00d3dcd2005-11-09 17:23:39 +0000629
630/**
Ben Hutchings3c31f072010-02-14 14:18:53 +0000631 * platform_driver_unregister - unregister a driver for platform-level devices
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800632 * @drv: platform driver structure
Russell King00d3dcd2005-11-09 17:23:39 +0000633 */
634void platform_driver_unregister(struct platform_driver *drv)
635{
636 driver_unregister(&drv->driver);
637}
638EXPORT_SYMBOL_GPL(platform_driver_unregister);
639
David Brownellc67334f2006-11-16 23:28:47 -0800640/**
Wolfram Sangc3b50dc2014-10-28 17:40:41 +0100641 * __platform_driver_probe - register driver for non-hotpluggable device
David Brownellc67334f2006-11-16 23:28:47 -0800642 * @drv: platform driver structure
Johan Hovold3f9120b2013-09-23 16:27:26 +0200643 * @probe: the driver probe routine, probably from an __init section
Wolfram Sangc3b50dc2014-10-28 17:40:41 +0100644 * @module: module which will be the owner of the driver
David Brownellc67334f2006-11-16 23:28:47 -0800645 *
646 * Use this instead of platform_driver_register() when you know the device
647 * is not hotpluggable and has already been registered, and you want to
648 * remove its run-once probe() infrastructure from memory after the driver
649 * has bound to the device.
650 *
651 * One typical use for this would be with drivers for controllers integrated
652 * into system-on-chip processors, where the controller devices have been
653 * configured as part of board setup.
654 *
Johan Hovold3f9120b2013-09-23 16:27:26 +0200655 * Note that this is incompatible with deferred probing.
Fabio Porcedda647c86d2013-03-26 10:35:15 +0100656 *
David Brownellc67334f2006-11-16 23:28:47 -0800657 * Returns zero if the driver registered and bound to a device, else returns
658 * a negative error code and with the driver not registered.
659 */
Wolfram Sangc3b50dc2014-10-28 17:40:41 +0100660int __init_or_module __platform_driver_probe(struct platform_driver *drv,
661 int (*probe)(struct platform_device *), struct module *module)
David Brownellc67334f2006-11-16 23:28:47 -0800662{
663 int retval, code;
664
Dmitry Torokhov5c36eb22015-03-30 16:20:07 -0700665 if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) {
666 pr_err("%s: drivers registered with %s can not be probed asynchronously\n",
667 drv->driver.name, __func__);
668 return -EINVAL;
669 }
670
671 /*
672 * We have to run our probes synchronously because we check if
673 * we find any devices to bind to and exit with error if there
674 * are any.
675 */
676 drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS;
677
Johan Hovold3f9120b2013-09-23 16:27:26 +0200678 /*
679 * Prevent driver from requesting probe deferral to avoid further
680 * futile probe attempts.
681 */
682 drv->prevent_deferred_probe = true;
683
Dmitry Torokhov1a6f2a72009-10-12 20:17:41 -0700684 /* make sure driver won't have bind/unbind attributes */
685 drv->driver.suppress_bind_attrs = true;
686
David Brownellc67334f2006-11-16 23:28:47 -0800687 /* temporary section violation during probe() */
688 drv->probe = probe;
Wolfram Sangc3b50dc2014-10-28 17:40:41 +0100689 retval = code = __platform_driver_register(drv, module);
David Brownellc67334f2006-11-16 23:28:47 -0800690
Dmitry Torokhov1a6f2a72009-10-12 20:17:41 -0700691 /*
692 * Fixup that section violation, being paranoid about code scanning
David Brownellc67334f2006-11-16 23:28:47 -0800693 * the list of drivers in order to probe new devices. Check to see
694 * if the probe was successful, and make sure any forced probes of
695 * new devices fail.
696 */
Patrick Pannutod79d3242010-08-06 17:12:41 -0700697 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
David Brownellc67334f2006-11-16 23:28:47 -0800698 drv->probe = NULL;
Greg Kroah-Hartmane5dd1272007-11-28 15:59:15 -0800699 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
David Brownellc67334f2006-11-16 23:28:47 -0800700 retval = -ENODEV;
701 drv->driver.probe = platform_drv_probe_fail;
Patrick Pannutod79d3242010-08-06 17:12:41 -0700702 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
David Brownellc67334f2006-11-16 23:28:47 -0800703
704 if (code != retval)
705 platform_driver_unregister(drv);
706 return retval;
707}
Wolfram Sangc3b50dc2014-10-28 17:40:41 +0100708EXPORT_SYMBOL_GPL(__platform_driver_probe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800710/**
Wolfram Sang291f6532014-10-28 17:40:42 +0100711 * __platform_create_bundle - register driver and create corresponding device
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800712 * @driver: platform driver structure
713 * @probe: the driver probe routine, probably from an __init section
714 * @res: set of resources that needs to be allocated for the device
715 * @n_res: number of resources
716 * @data: platform specific data for this platform device
717 * @size: size of platform specific data
Wolfram Sang291f6532014-10-28 17:40:42 +0100718 * @module: module which will be the owner of the driver
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800719 *
720 * Use this in legacy-style modules that probe hardware directly and
721 * register a single platform device and corresponding platform driver.
Jani Nikulaf0eae0e2010-03-11 18:11:45 +0200722 *
723 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800724 */
Wolfram Sang291f6532014-10-28 17:40:42 +0100725struct platform_device * __init_or_module __platform_create_bundle(
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800726 struct platform_driver *driver,
727 int (*probe)(struct platform_device *),
728 struct resource *res, unsigned int n_res,
Wolfram Sang291f6532014-10-28 17:40:42 +0100729 const void *data, size_t size, struct module *module)
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800730{
731 struct platform_device *pdev;
732 int error;
733
734 pdev = platform_device_alloc(driver->driver.name, -1);
735 if (!pdev) {
736 error = -ENOMEM;
737 goto err_out;
738 }
739
Anton Vorontsov807508c2010-09-07 17:31:54 +0400740 error = platform_device_add_resources(pdev, res, n_res);
741 if (error)
742 goto err_pdev_put;
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800743
Anton Vorontsov807508c2010-09-07 17:31:54 +0400744 error = platform_device_add_data(pdev, data, size);
745 if (error)
746 goto err_pdev_put;
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800747
748 error = platform_device_add(pdev);
749 if (error)
750 goto err_pdev_put;
751
Wolfram Sang291f6532014-10-28 17:40:42 +0100752 error = __platform_driver_probe(driver, probe, module);
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800753 if (error)
754 goto err_pdev_del;
755
756 return pdev;
757
758err_pdev_del:
759 platform_device_del(pdev);
760err_pdev_put:
761 platform_device_put(pdev);
762err_out:
763 return ERR_PTR(error);
764}
Wolfram Sang291f6532014-10-28 17:40:42 +0100765EXPORT_SYMBOL_GPL(__platform_create_bundle);
Dmitry Torokhovecdf6ce2009-12-29 20:11:20 -0800766
Thierry Redingdbe22562015-09-25 17:29:04 +0200767/**
768 * __platform_register_drivers - register an array of platform drivers
769 * @drivers: an array of drivers to register
770 * @count: the number of drivers to register
771 * @owner: module owning the drivers
772 *
773 * Registers platform drivers specified by an array. On failure to register a
774 * driver, all previously registered drivers will be unregistered. Callers of
775 * this API should use platform_unregister_drivers() to unregister drivers in
776 * the reverse order.
777 *
778 * Returns: 0 on success or a negative error code on failure.
779 */
780int __platform_register_drivers(struct platform_driver * const *drivers,
781 unsigned int count, struct module *owner)
782{
783 unsigned int i;
784 int err;
785
786 for (i = 0; i < count; i++) {
787 pr_debug("registering platform driver %ps\n", drivers[i]);
788
789 err = __platform_driver_register(drivers[i], owner);
790 if (err < 0) {
791 pr_err("failed to register platform driver %ps: %d\n",
792 drivers[i], err);
793 goto error;
794 }
795 }
796
797 return 0;
798
799error:
800 while (i--) {
801 pr_debug("unregistering platform driver %ps\n", drivers[i]);
802 platform_driver_unregister(drivers[i]);
803 }
804
805 return err;
806}
807EXPORT_SYMBOL_GPL(__platform_register_drivers);
808
809/**
810 * platform_unregister_drivers - unregister an array of platform drivers
811 * @drivers: an array of drivers to unregister
812 * @count: the number of drivers to unregister
813 *
814 * Unegisters platform drivers specified by an array. This is typically used
815 * to complement an earlier call to platform_register_drivers(). Drivers are
816 * unregistered in the reverse order in which they were registered.
817 */
818void platform_unregister_drivers(struct platform_driver * const *drivers,
819 unsigned int count)
820{
821 while (count--) {
822 pr_debug("unregistering platform driver %ps\n", drivers[count]);
823 platform_driver_unregister(drivers[count]);
824 }
825}
826EXPORT_SYMBOL_GPL(platform_unregister_drivers);
827
David Brownella0245f72006-05-29 10:37:33 -0700828/* modalias support enables more hands-off userspace setup:
829 * (a) environment variable lets new-style hotplug events work once system is
830 * fully running: "modprobe $MODALIAS"
831 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
832 * mishandled before system is fully running: "modprobe $(cat modalias)"
833 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800834static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
835 char *buf)
David Brownella0245f72006-05-29 10:37:33 -0700836{
837 struct platform_device *pdev = to_platform_device(dev);
Zhang Rui8c4ff6d2014-01-14 16:46:37 +0800838 int len;
839
Zhang Ruib9f73062014-01-14 16:46:38 +0800840 len = of_device_get_modalias(dev, buf, PAGE_SIZE -1);
841 if (len != -ENODEV)
842 return len;
843
Zhang Rui8c4ff6d2014-01-14 16:46:37 +0800844 len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
845 if (len != -ENODEV)
846 return len;
847
848 len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
David Brownella0245f72006-05-29 10:37:33 -0700849
850 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
851}
Greg Kroah-Hartmand06262e2013-08-23 14:24:37 -0700852static DEVICE_ATTR_RO(modalias);
David Brownella0245f72006-05-29 10:37:33 -0700853
Kim Phillips3d713e02014-06-02 19:42:58 -0500854static ssize_t driver_override_store(struct device *dev,
855 struct device_attribute *attr,
856 const char *buf, size_t count)
857{
858 struct platform_device *pdev = to_platform_device(dev);
Adrian Salidoc4c592b2017-04-25 16:55:26 -0700859 char *driver_override, *old, *cp;
Kim Phillips3d713e02014-06-02 19:42:58 -0500860
861 if (count > PATH_MAX)
862 return -EINVAL;
863
864 driver_override = kstrndup(buf, count, GFP_KERNEL);
865 if (!driver_override)
866 return -ENOMEM;
867
868 cp = strchr(driver_override, '\n');
869 if (cp)
870 *cp = '\0';
871
Adrian Salidoc4c592b2017-04-25 16:55:26 -0700872 device_lock(dev);
873 old = pdev->driver_override;
Kim Phillips3d713e02014-06-02 19:42:58 -0500874 if (strlen(driver_override)) {
875 pdev->driver_override = driver_override;
876 } else {
877 kfree(driver_override);
878 pdev->driver_override = NULL;
879 }
Adrian Salidoc4c592b2017-04-25 16:55:26 -0700880 device_unlock(dev);
Kim Phillips3d713e02014-06-02 19:42:58 -0500881
882 kfree(old);
883
884 return count;
885}
886
887static ssize_t driver_override_show(struct device *dev,
888 struct device_attribute *attr, char *buf)
889{
890 struct platform_device *pdev = to_platform_device(dev);
Adrian Salidoc4c592b2017-04-25 16:55:26 -0700891 ssize_t len;
Kim Phillips3d713e02014-06-02 19:42:58 -0500892
Adrian Salidoc4c592b2017-04-25 16:55:26 -0700893 device_lock(dev);
894 len = sprintf(buf, "%s\n", pdev->driver_override);
895 device_unlock(dev);
896 return len;
Kim Phillips3d713e02014-06-02 19:42:58 -0500897}
898static DEVICE_ATTR_RW(driver_override);
899
900
Greg Kroah-Hartmand06262e2013-08-23 14:24:37 -0700901static struct attribute *platform_dev_attrs[] = {
902 &dev_attr_modalias.attr,
Kim Phillips3d713e02014-06-02 19:42:58 -0500903 &dev_attr_driver_override.attr,
Greg Kroah-Hartmand06262e2013-08-23 14:24:37 -0700904 NULL,
David Brownella0245f72006-05-29 10:37:33 -0700905};
Greg Kroah-Hartmand06262e2013-08-23 14:24:37 -0700906ATTRIBUTE_GROUPS(platform_dev);
David Brownella0245f72006-05-29 10:37:33 -0700907
Kay Sievers7eff2e72007-08-14 15:15:12 +0200908static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
David Brownella0245f72006-05-29 10:37:33 -0700909{
910 struct platform_device *pdev = to_platform_device(dev);
Grant Likelyeca39302010-06-08 07:48:21 -0600911 int rc;
912
913 /* Some devices have extra OF data and an OF-style MODALIAS */
Fabio Porcedda0258e182013-03-26 10:35:16 +0100914 rc = of_device_uevent_modalias(dev, env);
Grant Likelyeca39302010-06-08 07:48:21 -0600915 if (rc != -ENODEV)
916 return rc;
David Brownella0245f72006-05-29 10:37:33 -0700917
Zhang Rui8c4ff6d2014-01-14 16:46:37 +0800918 rc = acpi_device_uevent_modalias(dev, env);
919 if (rc != -ENODEV)
920 return rc;
921
Eric Miao57fee4a2009-02-04 11:52:40 +0800922 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
Sebastian Andrzej Siewior0a268132011-08-15 16:51:22 +0200923 pdev->name);
David Brownella0245f72006-05-29 10:37:33 -0700924 return 0;
925}
926
Eric Miao57fee4a2009-02-04 11:52:40 +0800927static const struct platform_device_id *platform_match_id(
Uwe Kleine-König831fad22010-01-26 09:35:00 +0100928 const struct platform_device_id *id,
Eric Miao57fee4a2009-02-04 11:52:40 +0800929 struct platform_device *pdev)
930{
931 while (id->name[0]) {
932 if (strcmp(pdev->name, id->name) == 0) {
933 pdev->id_entry = id;
934 return id;
935 }
936 id++;
937 }
938 return NULL;
939}
940
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800942 * platform_match - bind platform device to platform driver.
943 * @dev: device.
944 * @drv: driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800946 * Platform device IDs are assumed to be encoded like this:
947 * "<name><instance>", where <name> is a short description of the type of
948 * device, like "pci" or "floppy", and <instance> is the enumerated
949 * instance of the device, like '0' or '42'. Driver IDs are simply
950 * "<name>". So, extract the <name> from the platform_device structure,
951 * and compare it against the name of the driver. Return whether they match
952 * or not.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800954static int platform_match(struct device *dev, struct device_driver *drv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955{
Eric Miao71b3e0c2009-01-31 22:47:44 +0800956 struct platform_device *pdev = to_platform_device(dev);
Eric Miao57fee4a2009-02-04 11:52:40 +0800957 struct platform_driver *pdrv = to_platform_driver(drv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958
Kim Phillips3d713e02014-06-02 19:42:58 -0500959 /* When driver_override is set, only bind to the matching driver */
960 if (pdev->driver_override)
961 return !strcmp(pdev->driver_override, drv->name);
962
Grant Likely05212152010-06-08 07:48:20 -0600963 /* Attempt an OF style match first */
964 if (of_driver_match_device(dev, drv))
965 return 1;
966
Mika Westerberg91e56872012-10-31 22:45:02 +0100967 /* Then try ACPI style match */
968 if (acpi_driver_match_device(dev, drv))
969 return 1;
970
Grant Likely05212152010-06-08 07:48:20 -0600971 /* Then try to match against the id table */
Eric Miao57fee4a2009-02-04 11:52:40 +0800972 if (pdrv->id_table)
973 return platform_match_id(pdrv->id_table, pdev) != NULL;
974
975 /* fall-back to driver name match */
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100976 return (strcmp(pdev->name, drv->name) == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977}
978
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200979#ifdef CONFIG_PM_SLEEP
980
981static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982{
Magnus Damm783ea7d2009-06-04 22:13:33 +0200983 struct platform_driver *pdrv = to_platform_driver(dev->driver);
984 struct platform_device *pdev = to_platform_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 int ret = 0;
986
Magnus Damm783ea7d2009-06-04 22:13:33 +0200987 if (dev->driver && pdrv->suspend)
988 ret = pdrv->suspend(pdev, mesg);
David Brownell386415d2006-09-03 13:16:45 -0700989
990 return ret;
991}
992
Rafael J. Wysocki25e18492008-05-21 01:40:43 +0200993static int platform_legacy_resume(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994{
Magnus Damm783ea7d2009-06-04 22:13:33 +0200995 struct platform_driver *pdrv = to_platform_driver(dev->driver);
996 struct platform_device *pdev = to_platform_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 int ret = 0;
998
Magnus Damm783ea7d2009-06-04 22:13:33 +0200999 if (dev->driver && pdrv->resume)
1000 ret = pdrv->resume(pdev);
Russell King9480e302005-10-28 09:52:56 -07001001
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 return ret;
1003}
1004
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001005#endif /* CONFIG_PM_SLEEP */
Magnus Damm9d730222009-08-20 20:25:32 +02001006
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001007#ifdef CONFIG_SUSPEND
1008
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001009int platform_pm_suspend(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001010{
1011 struct device_driver *drv = dev->driver;
1012 int ret = 0;
1013
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001014 if (!drv)
1015 return 0;
1016
1017 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001018 if (drv->pm->suspend)
1019 ret = drv->pm->suspend(dev);
1020 } else {
1021 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
1022 }
1023
1024 return ret;
1025}
1026
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001027int platform_pm_resume(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001028{
1029 struct device_driver *drv = dev->driver;
1030 int ret = 0;
1031
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001032 if (!drv)
1033 return 0;
1034
1035 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001036 if (drv->pm->resume)
1037 ret = drv->pm->resume(dev);
1038 } else {
1039 ret = platform_legacy_resume(dev);
1040 }
1041
1042 return ret;
1043}
1044
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001045#endif /* CONFIG_SUSPEND */
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001046
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +02001047#ifdef CONFIG_HIBERNATE_CALLBACKS
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001048
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001049int platform_pm_freeze(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001050{
1051 struct device_driver *drv = dev->driver;
1052 int ret = 0;
1053
1054 if (!drv)
1055 return 0;
1056
1057 if (drv->pm) {
1058 if (drv->pm->freeze)
1059 ret = drv->pm->freeze(dev);
1060 } else {
1061 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
1062 }
1063
1064 return ret;
1065}
1066
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001067int platform_pm_thaw(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001068{
1069 struct device_driver *drv = dev->driver;
1070 int ret = 0;
1071
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001072 if (!drv)
1073 return 0;
1074
1075 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001076 if (drv->pm->thaw)
1077 ret = drv->pm->thaw(dev);
1078 } else {
1079 ret = platform_legacy_resume(dev);
1080 }
1081
1082 return ret;
1083}
1084
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001085int platform_pm_poweroff(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001086{
1087 struct device_driver *drv = dev->driver;
1088 int ret = 0;
1089
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001090 if (!drv)
1091 return 0;
1092
1093 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001094 if (drv->pm->poweroff)
1095 ret = drv->pm->poweroff(dev);
1096 } else {
1097 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
1098 }
1099
1100 return ret;
1101}
1102
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001103int platform_pm_restore(struct device *dev)
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001104{
1105 struct device_driver *drv = dev->driver;
1106 int ret = 0;
1107
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001108 if (!drv)
1109 return 0;
1110
1111 if (drv->pm) {
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001112 if (drv->pm->restore)
1113 ret = drv->pm->restore(dev);
1114 } else {
1115 ret = platform_legacy_resume(dev);
1116 }
1117
1118 return ret;
1119}
1120
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001121#endif /* CONFIG_HIBERNATE_CALLBACKS */
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001122
Dmitry Torokhovd9ab7712009-07-22 00:37:25 +02001123static const struct dev_pm_ops platform_dev_pm_ops = {
Rafael J. Wysocki8b313a32011-04-29 00:36:32 +02001124 .runtime_suspend = pm_generic_runtime_suspend,
1125 .runtime_resume = pm_generic_runtime_resume,
Rafael J. Wysocki69c9dd12011-04-29 00:36:05 +02001126 USE_PLATFORM_PM_SLEEP_OPS
Rafael J. Wysocki25e18492008-05-21 01:40:43 +02001127};
1128
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129struct bus_type platform_bus_type = {
1130 .name = "platform",
Greg Kroah-Hartmand06262e2013-08-23 14:24:37 -07001131 .dev_groups = platform_dev_groups,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 .match = platform_match,
David Brownella0245f72006-05-29 10:37:33 -07001133 .uevent = platform_uevent,
Magnus Damm9d730222009-08-20 20:25:32 +02001134 .pm = &platform_dev_pm_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135};
Dmitry Torokhova96b2042005-12-10 01:36:28 -05001136EXPORT_SYMBOL_GPL(platform_bus_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137
1138int __init platform_bus_init(void)
1139{
Cornelia Huckfbfb1442006-11-27 10:35:08 +01001140 int error;
1141
Magnus Damm13977092009-03-30 14:37:25 -07001142 early_platform_cleanup();
1143
Cornelia Huckfbfb1442006-11-27 10:35:08 +01001144 error = device_register(&platform_bus);
1145 if (error)
1146 return error;
1147 error = bus_register(&platform_bus_type);
1148 if (error)
1149 device_unregister(&platform_bus);
Pantelis Antoniou801d7282014-10-28 22:36:01 +02001150 of_platform_register_reconfig_notifier();
Cornelia Huckfbfb1442006-11-27 10:35:08 +01001151 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152}
1153
1154#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1155u64 dma_get_required_mask(struct device *dev)
1156{
1157 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
1158 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
1159 u64 mask;
1160
1161 if (!high_totalram) {
1162 /* convert to mask just covering totalram */
1163 low_totalram = (1 << (fls(low_totalram) - 1));
1164 low_totalram += low_totalram - 1;
1165 mask = low_totalram;
1166 } else {
1167 high_totalram = (1 << (fls(high_totalram) - 1));
1168 high_totalram += high_totalram - 1;
1169 mask = (((u64)high_totalram) << 32) + 0xffffffff;
1170 }
James Bottomleye88a0c22008-03-09 11:57:56 -05001171 return mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172}
1173EXPORT_SYMBOL_GPL(dma_get_required_mask);
1174#endif
Magnus Damm13977092009-03-30 14:37:25 -07001175
1176static __initdata LIST_HEAD(early_platform_driver_list);
1177static __initdata LIST_HEAD(early_platform_device_list);
1178
1179/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001180 * early_platform_driver_register - register early platform driver
Randy Dunlapd86c1302009-04-21 07:22:53 -07001181 * @epdrv: early_platform driver structure
Magnus Damm13977092009-03-30 14:37:25 -07001182 * @buf: string passed from early_param()
Magnus Damm4d26e1392010-03-10 20:50:38 +09001183 *
1184 * Helper function for early_platform_init() / early_platform_init_buffer()
Magnus Damm13977092009-03-30 14:37:25 -07001185 */
1186int __init early_platform_driver_register(struct early_platform_driver *epdrv,
1187 char *buf)
1188{
Magnus Dammc60e0502009-11-27 17:38:51 +09001189 char *tmp;
Magnus Damm13977092009-03-30 14:37:25 -07001190 int n;
1191
1192 /* Simply add the driver to the end of the global list.
1193 * Drivers will by default be put on the list in compiled-in order.
1194 */
1195 if (!epdrv->list.next) {
1196 INIT_LIST_HEAD(&epdrv->list);
1197 list_add_tail(&epdrv->list, &early_platform_driver_list);
1198 }
1199
1200 /* If the user has specified device then make sure the driver
1201 * gets prioritized. The driver of the last device specified on
1202 * command line will be put first on the list.
1203 */
1204 n = strlen(epdrv->pdrv->driver.name);
1205 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1206 list_move(&epdrv->list, &early_platform_driver_list);
1207
Magnus Dammc60e0502009-11-27 17:38:51 +09001208 /* Allow passing parameters after device name */
1209 if (buf[n] == '\0' || buf[n] == ',')
Magnus Damm13977092009-03-30 14:37:25 -07001210 epdrv->requested_id = -1;
Magnus Dammc60e0502009-11-27 17:38:51 +09001211 else {
1212 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1213 &tmp, 10);
1214
1215 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1216 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1217 n = 0;
1218 } else
1219 n += strcspn(&buf[n + 1], ",") + 1;
1220 }
1221
1222 if (buf[n] == ',')
1223 n++;
1224
1225 if (epdrv->bufsize) {
1226 memcpy(epdrv->buffer, &buf[n],
1227 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1228 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1229 }
Magnus Damm13977092009-03-30 14:37:25 -07001230 }
1231
1232 return 0;
1233}
1234
1235/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001236 * early_platform_add_devices - adds a number of early platform devices
Magnus Damm13977092009-03-30 14:37:25 -07001237 * @devs: array of early platform devices to add
1238 * @num: number of early platform devices in array
Magnus Damm4d26e1392010-03-10 20:50:38 +09001239 *
1240 * Used by early architecture code to register early platform devices and
1241 * their platform data.
Magnus Damm13977092009-03-30 14:37:25 -07001242 */
1243void __init early_platform_add_devices(struct platform_device **devs, int num)
1244{
1245 struct device *dev;
1246 int i;
1247
1248 /* simply add the devices to list */
1249 for (i = 0; i < num; i++) {
1250 dev = &devs[i]->dev;
1251
1252 if (!dev->devres_head.next) {
Rafael J. Wysockibed2b422012-08-06 01:45:11 +02001253 pm_runtime_early_init(dev);
Magnus Damm13977092009-03-30 14:37:25 -07001254 INIT_LIST_HEAD(&dev->devres_head);
1255 list_add_tail(&dev->devres_head,
1256 &early_platform_device_list);
1257 }
1258 }
1259}
1260
1261/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001262 * early_platform_driver_register_all - register early platform drivers
Magnus Damm13977092009-03-30 14:37:25 -07001263 * @class_str: string to identify early platform driver class
Magnus Damm4d26e1392010-03-10 20:50:38 +09001264 *
1265 * Used by architecture code to register all early platform drivers
1266 * for a certain class. If omitted then only early platform drivers
1267 * with matching kernel command line class parameters will be registered.
Magnus Damm13977092009-03-30 14:37:25 -07001268 */
1269void __init early_platform_driver_register_all(char *class_str)
1270{
1271 /* The "class_str" parameter may or may not be present on the kernel
1272 * command line. If it is present then there may be more than one
1273 * matching parameter.
1274 *
1275 * Since we register our early platform drivers using early_param()
1276 * we need to make sure that they also get registered in the case
1277 * when the parameter is missing from the kernel command line.
1278 *
1279 * We use parse_early_options() to make sure the early_param() gets
1280 * called at least once. The early_param() may be called more than
1281 * once since the name of the preferred device may be specified on
1282 * the kernel command line. early_platform_driver_register() handles
1283 * this case for us.
1284 */
1285 parse_early_options(class_str);
1286}
1287
1288/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001289 * early_platform_match - find early platform device matching driver
Randy Dunlapd86c1302009-04-21 07:22:53 -07001290 * @epdrv: early platform driver structure
Magnus Damm13977092009-03-30 14:37:25 -07001291 * @id: id to match against
1292 */
Hanjun Guoa8257912013-08-17 20:42:25 +08001293static struct platform_device * __init
Magnus Damm13977092009-03-30 14:37:25 -07001294early_platform_match(struct early_platform_driver *epdrv, int id)
1295{
1296 struct platform_device *pd;
1297
1298 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1299 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1300 if (pd->id == id)
1301 return pd;
1302
1303 return NULL;
1304}
1305
1306/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001307 * early_platform_left - check if early platform driver has matching devices
Randy Dunlapd86c1302009-04-21 07:22:53 -07001308 * @epdrv: early platform driver structure
Magnus Damm13977092009-03-30 14:37:25 -07001309 * @id: return true if id or above exists
1310 */
Hanjun Guoa8257912013-08-17 20:42:25 +08001311static int __init early_platform_left(struct early_platform_driver *epdrv,
Magnus Damm13977092009-03-30 14:37:25 -07001312 int id)
1313{
1314 struct platform_device *pd;
1315
1316 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1317 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1318 if (pd->id >= id)
1319 return 1;
1320
1321 return 0;
1322}
1323
1324/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001325 * early_platform_driver_probe_id - probe drivers matching class_str and id
Magnus Damm13977092009-03-30 14:37:25 -07001326 * @class_str: string to identify early platform driver class
1327 * @id: id to match against
1328 * @nr_probe: number of platform devices to successfully probe before exiting
1329 */
1330static int __init early_platform_driver_probe_id(char *class_str,
1331 int id,
1332 int nr_probe)
1333{
1334 struct early_platform_driver *epdrv;
1335 struct platform_device *match;
1336 int match_id;
1337 int n = 0;
1338 int left = 0;
1339
1340 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1341 /* only use drivers matching our class_str */
1342 if (strcmp(class_str, epdrv->class_str))
1343 continue;
1344
1345 if (id == -2) {
1346 match_id = epdrv->requested_id;
1347 left = 1;
1348
1349 } else {
1350 match_id = id;
1351 left += early_platform_left(epdrv, id);
1352
1353 /* skip requested id */
1354 switch (epdrv->requested_id) {
1355 case EARLY_PLATFORM_ID_ERROR:
1356 case EARLY_PLATFORM_ID_UNSET:
1357 break;
1358 default:
1359 if (epdrv->requested_id == id)
1360 match_id = EARLY_PLATFORM_ID_UNSET;
1361 }
1362 }
1363
1364 switch (match_id) {
1365 case EARLY_PLATFORM_ID_ERROR:
Fabio Porcedda0258e182013-03-26 10:35:16 +01001366 pr_warn("%s: unable to parse %s parameter\n",
1367 class_str, epdrv->pdrv->driver.name);
Magnus Damm13977092009-03-30 14:37:25 -07001368 /* fall-through */
1369 case EARLY_PLATFORM_ID_UNSET:
1370 match = NULL;
1371 break;
1372 default:
1373 match = early_platform_match(epdrv, match_id);
1374 }
1375
1376 if (match) {
Paul Mundta636ee72010-03-09 06:57:53 +00001377 /*
1378 * Set up a sensible init_name to enable
1379 * dev_name() and others to be used before the
1380 * rest of the driver core is initialized.
1381 */
Paul Mundt06fe53b2010-05-13 17:56:56 +09001382 if (!match->dev.init_name && slab_is_available()) {
Paul Mundta636ee72010-03-09 06:57:53 +00001383 if (match->id != -1)
Paul Mundtbd050862010-03-29 15:51:35 +09001384 match->dev.init_name =
1385 kasprintf(GFP_KERNEL, "%s.%d",
1386 match->name,
1387 match->id);
Paul Mundta636ee72010-03-09 06:57:53 +00001388 else
Paul Mundtbd050862010-03-29 15:51:35 +09001389 match->dev.init_name =
1390 kasprintf(GFP_KERNEL, "%s",
1391 match->name);
Paul Mundta636ee72010-03-09 06:57:53 +00001392
Paul Mundta636ee72010-03-09 06:57:53 +00001393 if (!match->dev.init_name)
1394 return -ENOMEM;
1395 }
Paul Mundtbd050862010-03-29 15:51:35 +09001396
Magnus Damm13977092009-03-30 14:37:25 -07001397 if (epdrv->pdrv->probe(match))
Fabio Porcedda0258e182013-03-26 10:35:16 +01001398 pr_warn("%s: unable to probe %s early.\n",
1399 class_str, match->name);
Magnus Damm13977092009-03-30 14:37:25 -07001400 else
1401 n++;
1402 }
1403
1404 if (n >= nr_probe)
1405 break;
1406 }
1407
1408 if (left)
1409 return n;
1410 else
1411 return -ENODEV;
1412}
1413
1414/**
Magnus Damm4d26e1392010-03-10 20:50:38 +09001415 * early_platform_driver_probe - probe a class of registered drivers
Magnus Damm13977092009-03-30 14:37:25 -07001416 * @class_str: string to identify early platform driver class
1417 * @nr_probe: number of platform devices to successfully probe before exiting
1418 * @user_only: only probe user specified early platform devices
Magnus Damm4d26e1392010-03-10 20:50:38 +09001419 *
1420 * Used by architecture code to probe registered early platform drivers
1421 * within a certain class. For probe to happen a registered early platform
1422 * device matching a registered early platform driver is needed.
Magnus Damm13977092009-03-30 14:37:25 -07001423 */
1424int __init early_platform_driver_probe(char *class_str,
1425 int nr_probe,
1426 int user_only)
1427{
1428 int k, n, i;
1429
1430 n = 0;
1431 for (i = -2; n < nr_probe; i++) {
1432 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1433
1434 if (k < 0)
1435 break;
1436
1437 n += k;
1438
1439 if (user_only)
1440 break;
1441 }
1442
1443 return n;
1444}
1445
1446/**
1447 * early_platform_cleanup - clean up early platform code
1448 */
1449void __init early_platform_cleanup(void)
1450{
1451 struct platform_device *pd, *pd2;
1452
1453 /* clean up the devres list used to chain devices */
1454 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1455 dev.devres_head) {
1456 list_del(&pd->dev.devres_head);
1457 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));
1458 }
1459}
1460