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mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -08001/*
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08002 * drivers/base/dd.c - The core device/driver interactions.
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -08003 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08004 * This file contains the (sometimes tricky) code that controls the
5 * interactions between devices and drivers, which primarily includes
6 * driver binding and unbinding.
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -08007 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08008 * All of this code used to exist in drivers/base/bus.c, but was
9 * relocated to here in the name of compartmentalization (since it wasn't
10 * strictly code just for the 'struct bus_type'.
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -080011 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080012 * Copyright (c) 2002-5 Patrick Mochel
13 * Copyright (c) 2002-3 Open Source Development Labs
Greg Kroah-Hartmanb4028432009-05-11 14:16:57 -070014 * Copyright (c) 2007-2009 Greg Kroah-Hartman <gregkh@suse.de>
15 * Copyright (c) 2007-2009 Novell Inc.
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -080016 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080017 * This file is released under the GPLv2
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -080018 */
19
20#include <linux/device.h>
Arjan van de Ven216773a2009-02-14 01:59:06 +010021#include <linux/delay.h>
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -080022#include <linux/module.h>
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -070023#include <linux/kthread.h>
Andrew Morton735a7ff2006-10-27 11:42:37 -070024#include <linux/wait.h>
Arjan van de Ven216773a2009-02-14 01:59:06 +010025#include <linux/async.h>
Rafael J. Wysocki5e928f72009-08-18 23:38:32 +020026#include <linux/pm_runtime.h>
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -080027
28#include "base.h"
29#include "power/power.h"
30
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -080031
Kay Sievers1901fb22006-10-07 21:55:55 +020032static void driver_bound(struct device *dev)
33{
Greg Kroah-Hartman8940b4f2008-12-16 12:25:49 -080034 if (klist_node_attached(&dev->p->knode_driver)) {
Kay Sievers1901fb22006-10-07 21:55:55 +020035 printk(KERN_WARNING "%s: device %s already bound\n",
Harvey Harrison2b3a3022008-03-04 16:41:05 -080036 __func__, kobject_name(&dev->kobj));
Kay Sievers1901fb22006-10-07 21:55:55 +020037 return;
38 }
39
Kay Sievers1e0b2cf2008-10-30 01:36:48 +010040 pr_debug("driver: '%s': %s: bound to device '%s'\n", dev_name(dev),
Harvey Harrison2b3a3022008-03-04 16:41:05 -080041 __func__, dev->driver->name);
Kay Sievers1901fb22006-10-07 21:55:55 +020042
Stefani Seiboldfbb88fa2010-03-06 17:50:14 +010043 klist_add_tail(&dev->p->knode_driver, &dev->driver->p->klist_devices);
44
Kay Sievers1901fb22006-10-07 21:55:55 +020045 if (dev->bus)
Greg Kroah-Hartmanc6f7e722007-11-01 19:41:16 -070046 blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
Kay Sievers1901fb22006-10-07 21:55:55 +020047 BUS_NOTIFY_BOUND_DRIVER, dev);
Kay Sievers1901fb22006-10-07 21:55:55 +020048}
49
50static int driver_sysfs_add(struct device *dev)
51{
52 int ret;
53
Magnus Damm45daef02010-07-23 19:56:18 +090054 if (dev->bus)
55 blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
56 BUS_NOTIFY_BIND_DRIVER, dev);
57
Greg Kroah-Hartmane5dd1272007-11-28 15:59:15 -080058 ret = sysfs_create_link(&dev->driver->p->kobj, &dev->kobj,
Kay Sievers1901fb22006-10-07 21:55:55 +020059 kobject_name(&dev->kobj));
60 if (ret == 0) {
Greg Kroah-Hartmane5dd1272007-11-28 15:59:15 -080061 ret = sysfs_create_link(&dev->kobj, &dev->driver->p->kobj,
Kay Sievers1901fb22006-10-07 21:55:55 +020062 "driver");
63 if (ret)
Greg Kroah-Hartmane5dd1272007-11-28 15:59:15 -080064 sysfs_remove_link(&dev->driver->p->kobj,
Kay Sievers1901fb22006-10-07 21:55:55 +020065 kobject_name(&dev->kobj));
66 }
67 return ret;
68}
69
70static void driver_sysfs_remove(struct device *dev)
71{
72 struct device_driver *drv = dev->driver;
73
74 if (drv) {
Greg Kroah-Hartmane5dd1272007-11-28 15:59:15 -080075 sysfs_remove_link(&drv->p->kobj, kobject_name(&dev->kobj));
Kay Sievers1901fb22006-10-07 21:55:55 +020076 sysfs_remove_link(&dev->kobj, "driver");
77 }
78}
79
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -080080/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080081 * device_bind_driver - bind a driver to one device.
82 * @dev: device.
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -080083 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080084 * Allow manual attachment of a driver to a device.
85 * Caller must have already set @dev->driver.
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -080086 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080087 * Note that this does not modify the bus reference count
88 * nor take the bus's rwsem. Please verify those are accounted
89 * for before calling this. (It is ok to call with no other effort
90 * from a driver's probe() method.)
Patrick Mochel0d3e5a22005-04-05 23:46:33 -070091 *
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -080092 * This function must be called with the device lock held.
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -080093 */
Andrew Mortonf86db392006-08-14 22:43:20 -070094int device_bind_driver(struct device *dev)
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -080095{
Cornelia Huckcb986b72006-11-27 10:35:12 +010096 int ret;
97
98 ret = driver_sysfs_add(dev);
99 if (!ret)
100 driver_bound(dev);
101 return ret;
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800102}
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800103EXPORT_SYMBOL_GPL(device_bind_driver);
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800104
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700105static atomic_t probe_count = ATOMIC_INIT(0);
Andrew Morton735a7ff2006-10-27 11:42:37 -0700106static DECLARE_WAIT_QUEUE_HEAD(probe_waitqueue);
107
Cornelia Huck21c7f302007-02-05 16:15:25 -0800108static int really_probe(struct device *dev, struct device_driver *drv)
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800109{
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700110 int ret = 0;
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800111
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700112 atomic_inc(&probe_count);
Greg Kroah-Hartman7dc72b22007-11-28 23:49:41 -0800113 pr_debug("bus: '%s': %s: probing driver %s with device %s\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100114 drv->bus->name, __func__, drv->name, dev_name(dev));
Tejun Heo9ac78492007-01-20 16:00:26 +0900115 WARN_ON(!list_empty(&dev->devres_head));
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800116
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800117 dev->driver = drv;
Kay Sievers1901fb22006-10-07 21:55:55 +0200118 if (driver_sysfs_add(dev)) {
119 printk(KERN_ERR "%s: driver_sysfs_add(%s) failed\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100120 __func__, dev_name(dev));
Kay Sievers1901fb22006-10-07 21:55:55 +0200121 goto probe_failed;
122 }
123
Russell King594c8282006-01-05 14:29:51 +0000124 if (dev->bus->probe) {
125 ret = dev->bus->probe(dev);
Kay Sievers1901fb22006-10-07 21:55:55 +0200126 if (ret)
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700127 goto probe_failed;
Russell King594c8282006-01-05 14:29:51 +0000128 } else if (drv->probe) {
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700129 ret = drv->probe(dev);
Kay Sievers1901fb22006-10-07 21:55:55 +0200130 if (ret)
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700131 goto probe_failed;
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800132 }
Kay Sievers1901fb22006-10-07 21:55:55 +0200133
134 driver_bound(dev);
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700135 ret = 1;
Greg Kroah-Hartman7dc72b22007-11-28 23:49:41 -0800136 pr_debug("bus: '%s': %s: bound device %s to driver %s\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100137 drv->bus->name, __func__, dev_name(dev), drv->name);
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700138 goto done;
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700139
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700140probe_failed:
Tejun Heo9ac78492007-01-20 16:00:26 +0900141 devres_release_all(dev);
Kay Sievers1901fb22006-10-07 21:55:55 +0200142 driver_sysfs_remove(dev);
143 dev->driver = NULL;
144
Cornelia Huckc578abb2006-11-27 10:35:10 +0100145 if (ret != -ENODEV && ret != -ENXIO) {
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700146 /* driver matched but the probe failed */
147 printk(KERN_WARNING
148 "%s: probe of %s failed with error %d\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100149 drv->name, dev_name(dev), ret);
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700150 }
Cornelia Huckc578abb2006-11-27 10:35:10 +0100151 /*
152 * Ignore errors returned by ->probe so that the next driver can try
153 * its luck.
154 */
155 ret = 0;
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700156done:
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700157 atomic_dec(&probe_count);
Andrew Morton735a7ff2006-10-27 11:42:37 -0700158 wake_up(&probe_waitqueue);
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700159 return ret;
160}
161
162/**
163 * driver_probe_done
164 * Determine if the probe sequence is finished or not.
165 *
166 * Should somehow figure out how to use a semaphore, not an atomic variable...
167 */
168int driver_probe_done(void)
169{
Harvey Harrison2b3a3022008-03-04 16:41:05 -0800170 pr_debug("%s: probe_count = %d\n", __func__,
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700171 atomic_read(&probe_count));
172 if (atomic_read(&probe_count))
173 return -EBUSY;
174 return 0;
175}
176
177/**
Arjan van de Ven216773a2009-02-14 01:59:06 +0100178 * wait_for_device_probe
179 * Wait for device probing to be completed.
Arjan van de Ven216773a2009-02-14 01:59:06 +0100180 */
Ming Leib23530e2009-02-21 16:45:07 +0800181void wait_for_device_probe(void)
Arjan van de Ven216773a2009-02-14 01:59:06 +0100182{
183 /* wait for the known devices to complete their probing */
Ming Leib23530e2009-02-21 16:45:07 +0800184 wait_event(probe_waitqueue, atomic_read(&probe_count) == 0);
Arjan van de Ven216773a2009-02-14 01:59:06 +0100185 async_synchronize_full();
Arjan van de Ven216773a2009-02-14 01:59:06 +0100186}
Arjan van de Vend4d52912009-04-21 13:32:54 -0700187EXPORT_SYMBOL_GPL(wait_for_device_probe);
Arjan van de Ven216773a2009-02-14 01:59:06 +0100188
189/**
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700190 * driver_probe_device - attempt to bind device & driver together
191 * @drv: driver to bind a device to
192 * @dev: device to try to bind to the driver
193 *
Ming Lei49b420a2009-01-21 23:27:47 +0800194 * This function returns -ENODEV if the device is not registered,
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200195 * 1 if the device is bound successfully and 0 otherwise.
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700196 *
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800197 * This function must be called with @dev lock held. When called for a
198 * USB interface, @dev->parent lock must be held as well.
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700199 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800200int driver_probe_device(struct device_driver *drv, struct device *dev)
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700201{
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700202 int ret = 0;
203
Alan Sternf2eaae12006-09-18 16:22:34 -0400204 if (!device_is_registered(dev))
205 return -ENODEV;
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700206
Greg Kroah-Hartman7dc72b22007-11-28 23:49:41 -0800207 pr_debug("bus: '%s': %s: matched device %s with driver %s\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100208 drv->bus->name, __func__, dev_name(dev), drv->name);
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700209
Rafael J. Wysocki5e928f72009-08-18 23:38:32 +0200210 pm_runtime_get_noresume(dev);
211 pm_runtime_barrier(dev);
Cornelia Huck21c7f302007-02-05 16:15:25 -0800212 ret = really_probe(dev, drv);
Rafael J. Wysocki5e928f72009-08-18 23:38:32 +0200213 pm_runtime_put_sync(dev);
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700214
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700215 return ret;
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800216}
217
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800218static int __device_attach(struct device_driver *drv, void *data)
mochel@digitalimplant.org2287c322005-03-24 10:50:24 -0800219{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800220 struct device *dev = data;
Ming Lei49b420a2009-01-21 23:27:47 +0800221
222 if (!driver_match_device(drv, dev))
223 return 0;
224
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700225 return driver_probe_device(drv, dev);
mochel@digitalimplant.org2287c322005-03-24 10:50:24 -0800226}
227
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800228/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800229 * device_attach - try to attach device to a driver.
230 * @dev: device.
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800231 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800232 * Walk the list of drivers that the bus has and call
233 * driver_probe_device() for each pair. If a compatible
234 * pair is found, break out and return.
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700235 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800236 * Returns 1 if the device was bound to a driver;
Dmitry Torokhov59a3cd72009-05-05 20:38:28 -0700237 * 0 if no matching driver was found;
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800238 * -ENODEV if the device is not registered.
Alan Sternbf74ad52005-11-17 16:54:12 -0500239 *
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800240 * When called for a USB interface, @dev->parent lock must be held.
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800241 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800242int device_attach(struct device *dev)
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800243{
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700244 int ret = 0;
245
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800246 device_lock(dev);
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800247 if (dev->driver) {
Andrew Mortonf86db392006-08-14 22:43:20 -0700248 ret = device_bind_driver(dev);
249 if (ret == 0)
250 ret = 1;
Cornelia Huckc6a46692007-02-05 16:15:26 -0800251 else {
252 dev->driver = NULL;
253 ret = 0;
254 }
Cornelia Huck21c7f302007-02-05 16:15:25 -0800255 } else {
Rafael J. Wysocki5e928f72009-08-18 23:38:32 +0200256 pm_runtime_get_noresume(dev);
Adrian Bunk5adc55d2007-03-27 03:02:51 +0200257 ret = bus_for_each_drv(dev->bus, NULL, dev, __device_attach);
Rafael J. Wysocki5e928f72009-08-18 23:38:32 +0200258 pm_runtime_put_sync(dev);
Cornelia Huck21c7f302007-02-05 16:15:25 -0800259 }
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800260 device_unlock(dev);
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700261 return ret;
mochel@digitalimplant.org2287c322005-03-24 10:50:24 -0800262}
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800263EXPORT_SYMBOL_GPL(device_attach);
mochel@digitalimplant.org2287c322005-03-24 10:50:24 -0800264
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800265static int __driver_attach(struct device *dev, void *data)
mochel@digitalimplant.org2287c322005-03-24 10:50:24 -0800266{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800267 struct device_driver *drv = data;
mochel@digitalimplant.org2287c322005-03-24 10:50:24 -0800268
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700269 /*
270 * Lock device and try to bind to it. We drop the error
271 * here and always return 0, because we need to keep trying
272 * to bind to devices and some drivers will return an error
273 * simply if it didn't support the device.
274 *
275 * driver_probe_device() will spit a warning if there
276 * is an error.
277 */
278
Ming Lei49b420a2009-01-21 23:27:47 +0800279 if (!driver_match_device(drv, dev))
Arjan van de Ven6cd49582008-09-14 08:32:06 -0700280 return 0;
281
Alan Sternbf74ad52005-11-17 16:54:12 -0500282 if (dev->parent) /* Needed for USB */
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800283 device_lock(dev->parent);
284 device_lock(dev);
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700285 if (!dev->driver)
286 driver_probe_device(drv, dev);
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800287 device_unlock(dev);
Alan Sternbf74ad52005-11-17 16:54:12 -0500288 if (dev->parent)
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800289 device_unlock(dev->parent);
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700290
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800291 return 0;
292}
293
294/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800295 * driver_attach - try to bind driver to devices.
296 * @drv: driver.
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800297 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800298 * Walk the list of devices that the bus has on it and try to
299 * match the driver with each one. If driver_probe_device()
300 * returns 0 and the @dev->driver is set, we've found a
301 * compatible pair.
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800302 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800303int driver_attach(struct device_driver *drv)
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800304{
Andrew Mortonf86db392006-08-14 22:43:20 -0700305 return bus_for_each_dev(drv->bus, NULL, drv, __driver_attach);
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800306}
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800307EXPORT_SYMBOL_GPL(driver_attach);
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800308
Stefan Richterab71c6f2007-06-17 11:02:12 +0200309/*
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800310 * __device_release_driver() must be called with @dev lock held.
311 * When called for a USB interface, @dev->parent lock must be held as well.
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800312 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800313static void __device_release_driver(struct device *dev)
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800314{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800315 struct device_driver *drv;
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800316
Alan Sternef2c5172007-11-16 11:57:28 -0500317 drv = dev->driver;
Alan Sternc95a6b02005-05-06 15:38:33 -0400318 if (drv) {
Rafael J. Wysocki5e928f72009-08-18 23:38:32 +0200319 pm_runtime_get_noresume(dev);
320 pm_runtime_barrier(dev);
321
Kay Sievers1901fb22006-10-07 21:55:55 +0200322 driver_sysfs_remove(dev);
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700323
Benjamin Herrenschmidt116af372006-10-25 13:44:59 +1000324 if (dev->bus)
Greg Kroah-Hartmanc6f7e722007-11-01 19:41:16 -0700325 blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
Benjamin Herrenschmidt116af372006-10-25 13:44:59 +1000326 BUS_NOTIFY_UNBIND_DRIVER,
327 dev);
328
Alan Stern0f836ca2006-03-31 11:52:25 -0500329 if (dev->bus && dev->bus->remove)
Russell King594c8282006-01-05 14:29:51 +0000330 dev->bus->remove(dev);
331 else if (drv->remove)
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700332 drv->remove(dev);
Tejun Heo9ac78492007-01-20 16:00:26 +0900333 devres_release_all(dev);
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700334 dev->driver = NULL;
Greg Kroah-Hartman8940b4f2008-12-16 12:25:49 -0800335 klist_remove(&dev->p->knode_driver);
Joerg Roedel309b7d62009-04-24 14:57:00 +0200336 if (dev->bus)
337 blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
338 BUS_NOTIFY_UNBOUND_DRIVER,
339 dev);
Rafael J. Wysocki5e928f72009-08-18 23:38:32 +0200340
341 pm_runtime_put_sync(dev);
Patrick Mochel0d3e5a22005-04-05 23:46:33 -0700342 }
Alan Sternc95a6b02005-05-06 15:38:33 -0400343}
344
Stefan Richterab71c6f2007-06-17 11:02:12 +0200345/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800346 * device_release_driver - manually detach device from driver.
347 * @dev: device.
Stefan Richterab71c6f2007-06-17 11:02:12 +0200348 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800349 * Manually detach device from driver.
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800350 * When called for a USB interface, @dev->parent lock must be held.
Stefan Richterab71c6f2007-06-17 11:02:12 +0200351 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800352void device_release_driver(struct device *dev)
Alan Sternc95a6b02005-05-06 15:38:33 -0400353{
354 /*
355 * If anyone calls device_release_driver() recursively from
356 * within their ->remove callback for the same device, they
357 * will deadlock right here.
358 */
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800359 device_lock(dev);
Alan Sternc95a6b02005-05-06 15:38:33 -0400360 __device_release_driver(dev);
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800361 device_unlock(dev);
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800362}
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800363EXPORT_SYMBOL_GPL(device_release_driver);
mochel@digitalimplant.org94e7b1c52005-03-21 12:25:36 -0800364
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800365/**
366 * driver_detach - detach driver from all devices it controls.
367 * @drv: driver.
368 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800369void driver_detach(struct device_driver *drv)
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800370{
Greg Kroah-Hartman8940b4f2008-12-16 12:25:49 -0800371 struct device_private *dev_prv;
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800372 struct device *dev;
Alan Sternc95a6b02005-05-06 15:38:33 -0400373
374 for (;;) {
Greg Kroah-Hartmane5dd1272007-11-28 15:59:15 -0800375 spin_lock(&drv->p->klist_devices.k_lock);
376 if (list_empty(&drv->p->klist_devices.k_list)) {
377 spin_unlock(&drv->p->klist_devices.k_lock);
Alan Sternc95a6b02005-05-06 15:38:33 -0400378 break;
379 }
Greg Kroah-Hartman8940b4f2008-12-16 12:25:49 -0800380 dev_prv = list_entry(drv->p->klist_devices.k_list.prev,
381 struct device_private,
382 knode_driver.n_node);
383 dev = dev_prv->device;
Alan Sternc95a6b02005-05-06 15:38:33 -0400384 get_device(dev);
Greg Kroah-Hartmane5dd1272007-11-28 15:59:15 -0800385 spin_unlock(&drv->p->klist_devices.k_lock);
Alan Sternc95a6b02005-05-06 15:38:33 -0400386
Alan Sternbf74ad52005-11-17 16:54:12 -0500387 if (dev->parent) /* Needed for USB */
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800388 device_lock(dev->parent);
389 device_lock(dev);
Alan Sternc95a6b02005-05-06 15:38:33 -0400390 if (dev->driver == drv)
391 __device_release_driver(dev);
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800392 device_unlock(dev);
Alan Sternbf74ad52005-11-17 16:54:12 -0500393 if (dev->parent)
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800394 device_unlock(dev->parent);
Alan Sternc95a6b02005-05-06 15:38:33 -0400395 put_device(dev);
396 }
mochel@digitalimplant.org07e4a3e2005-03-21 10:52:54 -0800397}
Greg Kroah-Hartmanb4028432009-05-11 14:16:57 -0700398
399/*
400 * These exports can't be _GPL due to .h files using this within them, and it
401 * might break something that was previously working...
402 */
403void *dev_get_drvdata(const struct device *dev)
404{
405 if (dev && dev->p)
406 return dev->p->driver_data;
407 return NULL;
408}
409EXPORT_SYMBOL(dev_get_drvdata);
410
411void dev_set_drvdata(struct device *dev, void *data)
412{
413 int error;
414
415 if (!dev)
416 return;
417 if (!dev->p) {
418 error = device_private_init(dev);
419 if (error)
420 return;
421 }
422 dev->p->driver_data = data;
423}
424EXPORT_SYMBOL(dev_set_drvdata);