mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1 | /* |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 2 | * drivers/base/dd.c - The core device/driver interactions. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 3 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 4 | * 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.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 7 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 8 | * 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.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 11 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 12 | * Copyright (c) 2002-5 Patrick Mochel |
| 13 | * Copyright (c) 2002-3 Open Source Development Labs |
Greg Kroah-Hartman | b402843 | 2009-05-11 14:16:57 -0700 | [diff] [blame] | 14 | * Copyright (c) 2007-2009 Greg Kroah-Hartman <gregkh@suse.de> |
| 15 | * Copyright (c) 2007-2009 Novell Inc. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 16 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 17 | * This file is released under the GPLv2 |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 18 | */ |
| 19 | |
| 20 | #include <linux/device.h> |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 21 | #include <linux/delay.h> |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 22 | #include <linux/module.h> |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 23 | #include <linux/kthread.h> |
Andrew Morton | 735a7ff | 2006-10-27 11:42:37 -0700 | [diff] [blame] | 24 | #include <linux/wait.h> |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 25 | #include <linux/async.h> |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 26 | #include <linux/pm_runtime.h> |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 27 | |
| 28 | #include "base.h" |
| 29 | #include "power/power.h" |
| 30 | |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 31 | /* |
| 32 | * Deferred Probe infrastructure. |
| 33 | * |
| 34 | * Sometimes driver probe order matters, but the kernel doesn't always have |
| 35 | * dependency information which means some drivers will get probed before a |
| 36 | * resource it depends on is available. For example, an SDHCI driver may |
| 37 | * first need a GPIO line from an i2c GPIO controller before it can be |
| 38 | * initialized. If a required resource is not available yet, a driver can |
| 39 | * request probing to be deferred by returning -EPROBE_DEFER from its probe hook |
| 40 | * |
| 41 | * Deferred probe maintains two lists of devices, a pending list and an active |
| 42 | * list. A driver returning -EPROBE_DEFER causes the device to be added to the |
| 43 | * pending list. A successful driver probe will trigger moving all devices |
| 44 | * from the pending to the active list so that the workqueue will eventually |
| 45 | * retry them. |
| 46 | * |
| 47 | * The deferred_probe_mutex must be held any time the deferred_probe_*_list |
Greg Kroah-Hartman | ef8a3fd | 2012-03-08 12:17:22 -0800 | [diff] [blame] | 48 | * of the (struct device*)->p->deferred_probe pointers are manipulated |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 49 | */ |
| 50 | static DEFINE_MUTEX(deferred_probe_mutex); |
| 51 | static LIST_HEAD(deferred_probe_pending_list); |
| 52 | static LIST_HEAD(deferred_probe_active_list); |
| 53 | static struct workqueue_struct *deferred_wq; |
| 54 | |
| 55 | /** |
| 56 | * deferred_probe_work_func() - Retry probing devices in the active list. |
| 57 | */ |
| 58 | static void deferred_probe_work_func(struct work_struct *work) |
| 59 | { |
| 60 | struct device *dev; |
Greg Kroah-Hartman | ef8a3fd | 2012-03-08 12:17:22 -0800 | [diff] [blame] | 61 | struct device_private *private; |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 62 | /* |
| 63 | * This block processes every device in the deferred 'active' list. |
| 64 | * Each device is removed from the active list and passed to |
| 65 | * bus_probe_device() to re-attempt the probe. The loop continues |
| 66 | * until every device in the active list is removed and retried. |
| 67 | * |
| 68 | * Note: Once the device is removed from the list and the mutex is |
| 69 | * released, it is possible for the device get freed by another thread |
| 70 | * and cause a illegal pointer dereference. This code uses |
| 71 | * get/put_device() to ensure the device structure cannot disappear |
| 72 | * from under our feet. |
| 73 | */ |
| 74 | mutex_lock(&deferred_probe_mutex); |
| 75 | while (!list_empty(&deferred_probe_active_list)) { |
Greg Kroah-Hartman | ef8a3fd | 2012-03-08 12:17:22 -0800 | [diff] [blame] | 76 | private = list_first_entry(&deferred_probe_active_list, |
| 77 | typeof(*dev->p), deferred_probe); |
| 78 | dev = private->device; |
| 79 | list_del_init(&private->deferred_probe); |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 80 | |
| 81 | get_device(dev); |
| 82 | |
Greg Kroah-Hartman | 8b0372a | 2012-03-08 12:20:37 -0800 | [diff] [blame] | 83 | /* |
| 84 | * Drop the mutex while probing each device; the probe path may |
| 85 | * manipulate the deferred list |
| 86 | */ |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 87 | mutex_unlock(&deferred_probe_mutex); |
Mark Brown | 8153584 | 2012-07-05 14:04:44 +0100 | [diff] [blame] | 88 | |
| 89 | /* |
| 90 | * Force the device to the end of the dpm_list since |
| 91 | * the PM code assumes that the order we add things to |
| 92 | * the list is a good order for suspend but deferred |
| 93 | * probe makes that very unsafe. |
| 94 | */ |
| 95 | device_pm_lock(); |
| 96 | device_pm_move_last(dev); |
| 97 | device_pm_unlock(); |
| 98 | |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 99 | dev_dbg(dev, "Retrying from deferred list\n"); |
| 100 | bus_probe_device(dev); |
Mark Brown | 8153584 | 2012-07-05 14:04:44 +0100 | [diff] [blame] | 101 | |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 102 | mutex_lock(&deferred_probe_mutex); |
| 103 | |
| 104 | put_device(dev); |
| 105 | } |
| 106 | mutex_unlock(&deferred_probe_mutex); |
| 107 | } |
| 108 | static DECLARE_WORK(deferred_probe_work, deferred_probe_work_func); |
| 109 | |
| 110 | static void driver_deferred_probe_add(struct device *dev) |
| 111 | { |
| 112 | mutex_lock(&deferred_probe_mutex); |
Greg Kroah-Hartman | ef8a3fd | 2012-03-08 12:17:22 -0800 | [diff] [blame] | 113 | if (list_empty(&dev->p->deferred_probe)) { |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 114 | dev_dbg(dev, "Added to deferred list\n"); |
Kuninori Morimoto | 1d29cfa | 2012-05-29 18:46:06 -0700 | [diff] [blame] | 115 | list_add_tail(&dev->p->deferred_probe, &deferred_probe_pending_list); |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 116 | } |
| 117 | mutex_unlock(&deferred_probe_mutex); |
| 118 | } |
| 119 | |
| 120 | void driver_deferred_probe_del(struct device *dev) |
| 121 | { |
| 122 | mutex_lock(&deferred_probe_mutex); |
Greg Kroah-Hartman | ef8a3fd | 2012-03-08 12:17:22 -0800 | [diff] [blame] | 123 | if (!list_empty(&dev->p->deferred_probe)) { |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 124 | dev_dbg(dev, "Removed from deferred list\n"); |
Greg Kroah-Hartman | ef8a3fd | 2012-03-08 12:17:22 -0800 | [diff] [blame] | 125 | list_del_init(&dev->p->deferred_probe); |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 126 | } |
| 127 | mutex_unlock(&deferred_probe_mutex); |
| 128 | } |
| 129 | |
| 130 | static bool driver_deferred_probe_enable = false; |
| 131 | /** |
| 132 | * driver_deferred_probe_trigger() - Kick off re-probing deferred devices |
| 133 | * |
| 134 | * This functions moves all devices from the pending list to the active |
| 135 | * list and schedules the deferred probe workqueue to process them. It |
| 136 | * should be called anytime a driver is successfully bound to a device. |
| 137 | */ |
| 138 | static void driver_deferred_probe_trigger(void) |
| 139 | { |
| 140 | if (!driver_deferred_probe_enable) |
| 141 | return; |
| 142 | |
Greg Kroah-Hartman | 8b0372a | 2012-03-08 12:20:37 -0800 | [diff] [blame] | 143 | /* |
| 144 | * A successful probe means that all the devices in the pending list |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 145 | * should be triggered to be reprobed. Move all the deferred devices |
Greg Kroah-Hartman | 8b0372a | 2012-03-08 12:20:37 -0800 | [diff] [blame] | 146 | * into the active list so they can be retried by the workqueue |
| 147 | */ |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 148 | mutex_lock(&deferred_probe_mutex); |
| 149 | list_splice_tail_init(&deferred_probe_pending_list, |
| 150 | &deferred_probe_active_list); |
| 151 | mutex_unlock(&deferred_probe_mutex); |
| 152 | |
Greg Kroah-Hartman | 8b0372a | 2012-03-08 12:20:37 -0800 | [diff] [blame] | 153 | /* |
| 154 | * Kick the re-probe thread. It may already be scheduled, but it is |
| 155 | * safe to kick it again. |
| 156 | */ |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 157 | queue_work(deferred_wq, &deferred_probe_work); |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * deferred_probe_initcall() - Enable probing of deferred devices |
| 162 | * |
| 163 | * We don't want to get in the way when the bulk of drivers are getting probed. |
| 164 | * Instead, this initcall makes sure that deferred probing is delayed until |
| 165 | * late_initcall time. |
| 166 | */ |
| 167 | static int deferred_probe_initcall(void) |
| 168 | { |
| 169 | deferred_wq = create_singlethread_workqueue("deferwq"); |
| 170 | if (WARN_ON(!deferred_wq)) |
| 171 | return -ENOMEM; |
| 172 | |
| 173 | driver_deferred_probe_enable = true; |
| 174 | driver_deferred_probe_trigger(); |
Grant Likely | d72cca1 | 2013-02-14 18:14:27 +0000 | [diff] [blame^] | 175 | /* Sort as many dependencies as possible before exiting initcalls */ |
| 176 | flush_workqueue(deferred_wq); |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 177 | return 0; |
| 178 | } |
| 179 | late_initcall(deferred_probe_initcall); |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 180 | |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 181 | static void driver_bound(struct device *dev) |
| 182 | { |
Greg Kroah-Hartman | 8940b4f | 2008-12-16 12:25:49 -0800 | [diff] [blame] | 183 | if (klist_node_attached(&dev->p->knode_driver)) { |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 184 | printk(KERN_WARNING "%s: device %s already bound\n", |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 185 | __func__, kobject_name(&dev->kobj)); |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 186 | return; |
| 187 | } |
| 188 | |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 189 | pr_debug("driver: '%s': %s: bound to device '%s'\n", dev_name(dev), |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 190 | __func__, dev->driver->name); |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 191 | |
Stefani Seibold | fbb88fa | 2010-03-06 17:50:14 +0100 | [diff] [blame] | 192 | klist_add_tail(&dev->p->knode_driver, &dev->driver->p->klist_devices); |
| 193 | |
Greg Kroah-Hartman | 8b0372a | 2012-03-08 12:20:37 -0800 | [diff] [blame] | 194 | /* |
| 195 | * Make sure the device is no longer in one of the deferred lists and |
| 196 | * kick off retrying all pending devices |
| 197 | */ |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 198 | driver_deferred_probe_del(dev); |
| 199 | driver_deferred_probe_trigger(); |
| 200 | |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 201 | if (dev->bus) |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 202 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 203 | BUS_NOTIFY_BOUND_DRIVER, dev); |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | static int driver_sysfs_add(struct device *dev) |
| 207 | { |
| 208 | int ret; |
| 209 | |
Magnus Damm | 45daef0 | 2010-07-23 19:56:18 +0900 | [diff] [blame] | 210 | if (dev->bus) |
| 211 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
| 212 | BUS_NOTIFY_BIND_DRIVER, dev); |
| 213 | |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 214 | ret = sysfs_create_link(&dev->driver->p->kobj, &dev->kobj, |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 215 | kobject_name(&dev->kobj)); |
| 216 | if (ret == 0) { |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 217 | ret = sysfs_create_link(&dev->kobj, &dev->driver->p->kobj, |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 218 | "driver"); |
| 219 | if (ret) |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 220 | sysfs_remove_link(&dev->driver->p->kobj, |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 221 | kobject_name(&dev->kobj)); |
| 222 | } |
| 223 | return ret; |
| 224 | } |
| 225 | |
| 226 | static void driver_sysfs_remove(struct device *dev) |
| 227 | { |
| 228 | struct device_driver *drv = dev->driver; |
| 229 | |
| 230 | if (drv) { |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 231 | sysfs_remove_link(&drv->p->kobj, kobject_name(&dev->kobj)); |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 232 | sysfs_remove_link(&dev->kobj, "driver"); |
| 233 | } |
| 234 | } |
| 235 | |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 236 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 237 | * device_bind_driver - bind a driver to one device. |
| 238 | * @dev: device. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 239 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 240 | * Allow manual attachment of a driver to a device. |
| 241 | * Caller must have already set @dev->driver. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 242 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 243 | * Note that this does not modify the bus reference count |
| 244 | * nor take the bus's rwsem. Please verify those are accounted |
| 245 | * for before calling this. (It is ok to call with no other effort |
| 246 | * from a driver's probe() method.) |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 247 | * |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 248 | * This function must be called with the device lock held. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 249 | */ |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 250 | int device_bind_driver(struct device *dev) |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 251 | { |
Cornelia Huck | cb986b7 | 2006-11-27 10:35:12 +0100 | [diff] [blame] | 252 | int ret; |
| 253 | |
| 254 | ret = driver_sysfs_add(dev); |
| 255 | if (!ret) |
| 256 | driver_bound(dev); |
| 257 | return ret; |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 258 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 259 | EXPORT_SYMBOL_GPL(device_bind_driver); |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 260 | |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 261 | static atomic_t probe_count = ATOMIC_INIT(0); |
Andrew Morton | 735a7ff | 2006-10-27 11:42:37 -0700 | [diff] [blame] | 262 | static DECLARE_WAIT_QUEUE_HEAD(probe_waitqueue); |
| 263 | |
Cornelia Huck | 21c7f30 | 2007-02-05 16:15:25 -0800 | [diff] [blame] | 264 | static int really_probe(struct device *dev, struct device_driver *drv) |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 265 | { |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 266 | int ret = 0; |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 267 | |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 268 | atomic_inc(&probe_count); |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 269 | pr_debug("bus: '%s': %s: probing driver %s with device %s\n", |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 270 | drv->bus->name, __func__, drv->name, dev_name(dev)); |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 271 | WARN_ON(!list_empty(&dev->devres_head)); |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 272 | |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 273 | dev->driver = drv; |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 274 | if (driver_sysfs_add(dev)) { |
| 275 | printk(KERN_ERR "%s: driver_sysfs_add(%s) failed\n", |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 276 | __func__, dev_name(dev)); |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 277 | goto probe_failed; |
| 278 | } |
| 279 | |
Russell King | 594c828 | 2006-01-05 14:29:51 +0000 | [diff] [blame] | 280 | if (dev->bus->probe) { |
| 281 | ret = dev->bus->probe(dev); |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 282 | if (ret) |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 283 | goto probe_failed; |
Russell King | 594c828 | 2006-01-05 14:29:51 +0000 | [diff] [blame] | 284 | } else if (drv->probe) { |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 285 | ret = drv->probe(dev); |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 286 | if (ret) |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 287 | goto probe_failed; |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 288 | } |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 289 | |
| 290 | driver_bound(dev); |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 291 | ret = 1; |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 292 | pr_debug("bus: '%s': %s: bound device %s to driver %s\n", |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 293 | drv->bus->name, __func__, dev_name(dev), drv->name); |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 294 | goto done; |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 295 | |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 296 | probe_failed: |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 297 | devres_release_all(dev); |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 298 | driver_sysfs_remove(dev); |
| 299 | dev->driver = NULL; |
Hans de Goede | 0998d06 | 2012-05-23 00:09:34 +0200 | [diff] [blame] | 300 | dev_set_drvdata(dev, NULL); |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 301 | |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 302 | if (ret == -EPROBE_DEFER) { |
| 303 | /* Driver requested deferred probing */ |
| 304 | dev_info(dev, "Driver %s requests probe deferral\n", drv->name); |
| 305 | driver_deferred_probe_add(dev); |
| 306 | } else if (ret != -ENODEV && ret != -ENXIO) { |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 307 | /* driver matched but the probe failed */ |
| 308 | printk(KERN_WARNING |
| 309 | "%s: probe of %s failed with error %d\n", |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 310 | drv->name, dev_name(dev), ret); |
Wolfram Sang | bcbe4f9 | 2011-09-20 19:41:17 +0200 | [diff] [blame] | 311 | } else { |
| 312 | pr_debug("%s: probe of %s rejects match %d\n", |
| 313 | drv->name, dev_name(dev), ret); |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 314 | } |
Cornelia Huck | c578abb | 2006-11-27 10:35:10 +0100 | [diff] [blame] | 315 | /* |
| 316 | * Ignore errors returned by ->probe so that the next driver can try |
| 317 | * its luck. |
| 318 | */ |
| 319 | ret = 0; |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 320 | done: |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 321 | atomic_dec(&probe_count); |
Andrew Morton | 735a7ff | 2006-10-27 11:42:37 -0700 | [diff] [blame] | 322 | wake_up(&probe_waitqueue); |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 323 | return ret; |
| 324 | } |
| 325 | |
| 326 | /** |
| 327 | * driver_probe_done |
| 328 | * Determine if the probe sequence is finished or not. |
| 329 | * |
| 330 | * Should somehow figure out how to use a semaphore, not an atomic variable... |
| 331 | */ |
| 332 | int driver_probe_done(void) |
| 333 | { |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 334 | pr_debug("%s: probe_count = %d\n", __func__, |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 335 | atomic_read(&probe_count)); |
| 336 | if (atomic_read(&probe_count)) |
| 337 | return -EBUSY; |
| 338 | return 0; |
| 339 | } |
| 340 | |
| 341 | /** |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 342 | * wait_for_device_probe |
| 343 | * Wait for device probing to be completed. |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 344 | */ |
Ming Lei | b23530e | 2009-02-21 16:45:07 +0800 | [diff] [blame] | 345 | void wait_for_device_probe(void) |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 346 | { |
| 347 | /* wait for the known devices to complete their probing */ |
Ming Lei | b23530e | 2009-02-21 16:45:07 +0800 | [diff] [blame] | 348 | wait_event(probe_waitqueue, atomic_read(&probe_count) == 0); |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 349 | async_synchronize_full(); |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 350 | } |
Arjan van de Ven | d4d5291 | 2009-04-21 13:32:54 -0700 | [diff] [blame] | 351 | EXPORT_SYMBOL_GPL(wait_for_device_probe); |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 352 | |
| 353 | /** |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 354 | * driver_probe_device - attempt to bind device & driver together |
| 355 | * @drv: driver to bind a device to |
| 356 | * @dev: device to try to bind to the driver |
| 357 | * |
Ming Lei | 49b420a | 2009-01-21 23:27:47 +0800 | [diff] [blame] | 358 | * This function returns -ENODEV if the device is not registered, |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 359 | * 1 if the device is bound successfully and 0 otherwise. |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 360 | * |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 361 | * This function must be called with @dev lock held. When called for a |
| 362 | * USB interface, @dev->parent lock must be held as well. |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 363 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 364 | int driver_probe_device(struct device_driver *drv, struct device *dev) |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 365 | { |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 366 | int ret = 0; |
| 367 | |
Alan Stern | f2eaae1 | 2006-09-18 16:22:34 -0400 | [diff] [blame] | 368 | if (!device_is_registered(dev)) |
| 369 | return -ENODEV; |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 370 | |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 371 | pr_debug("bus: '%s': %s: matched device %s with driver %s\n", |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 372 | drv->bus->name, __func__, dev_name(dev), drv->name); |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 373 | |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 374 | pm_runtime_barrier(dev); |
Cornelia Huck | 21c7f30 | 2007-02-05 16:15:25 -0800 | [diff] [blame] | 375 | ret = really_probe(dev, drv); |
Rafael J. Wysocki | eed5d21 | 2012-07-12 11:51:48 +0200 | [diff] [blame] | 376 | pm_runtime_idle(dev); |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 377 | |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 378 | return ret; |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 379 | } |
| 380 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 381 | static int __device_attach(struct device_driver *drv, void *data) |
mochel@digitalimplant.org | 2287c32 | 2005-03-24 10:50:24 -0800 | [diff] [blame] | 382 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 383 | struct device *dev = data; |
Ming Lei | 49b420a | 2009-01-21 23:27:47 +0800 | [diff] [blame] | 384 | |
| 385 | if (!driver_match_device(drv, dev)) |
| 386 | return 0; |
| 387 | |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 388 | return driver_probe_device(drv, dev); |
mochel@digitalimplant.org | 2287c32 | 2005-03-24 10:50:24 -0800 | [diff] [blame] | 389 | } |
| 390 | |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 391 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 392 | * device_attach - try to attach device to a driver. |
| 393 | * @dev: device. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 394 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 395 | * Walk the list of drivers that the bus has and call |
| 396 | * driver_probe_device() for each pair. If a compatible |
| 397 | * pair is found, break out and return. |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 398 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 399 | * Returns 1 if the device was bound to a driver; |
Dmitry Torokhov | 59a3cd7 | 2009-05-05 20:38:28 -0700 | [diff] [blame] | 400 | * 0 if no matching driver was found; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 401 | * -ENODEV if the device is not registered. |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 402 | * |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 403 | * When called for a USB interface, @dev->parent lock must be held. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 404 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 405 | int device_attach(struct device *dev) |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 406 | { |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 407 | int ret = 0; |
| 408 | |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 409 | device_lock(dev); |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 410 | if (dev->driver) { |
Sebastian Ott | 8497d6a | 2011-04-12 19:05:37 +0200 | [diff] [blame] | 411 | if (klist_node_attached(&dev->p->knode_driver)) { |
| 412 | ret = 1; |
| 413 | goto out_unlock; |
| 414 | } |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 415 | ret = device_bind_driver(dev); |
| 416 | if (ret == 0) |
| 417 | ret = 1; |
Cornelia Huck | c6a4669 | 2007-02-05 16:15:26 -0800 | [diff] [blame] | 418 | else { |
| 419 | dev->driver = NULL; |
| 420 | ret = 0; |
| 421 | } |
Cornelia Huck | 21c7f30 | 2007-02-05 16:15:25 -0800 | [diff] [blame] | 422 | } else { |
Adrian Bunk | 5adc55d | 2007-03-27 03:02:51 +0200 | [diff] [blame] | 423 | ret = bus_for_each_drv(dev->bus, NULL, dev, __device_attach); |
Rafael J. Wysocki | eed5d21 | 2012-07-12 11:51:48 +0200 | [diff] [blame] | 424 | pm_runtime_idle(dev); |
Cornelia Huck | 21c7f30 | 2007-02-05 16:15:25 -0800 | [diff] [blame] | 425 | } |
Sebastian Ott | 8497d6a | 2011-04-12 19:05:37 +0200 | [diff] [blame] | 426 | out_unlock: |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 427 | device_unlock(dev); |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 428 | return ret; |
mochel@digitalimplant.org | 2287c32 | 2005-03-24 10:50:24 -0800 | [diff] [blame] | 429 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 430 | EXPORT_SYMBOL_GPL(device_attach); |
mochel@digitalimplant.org | 2287c32 | 2005-03-24 10:50:24 -0800 | [diff] [blame] | 431 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 432 | static int __driver_attach(struct device *dev, void *data) |
mochel@digitalimplant.org | 2287c32 | 2005-03-24 10:50:24 -0800 | [diff] [blame] | 433 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 434 | struct device_driver *drv = data; |
mochel@digitalimplant.org | 2287c32 | 2005-03-24 10:50:24 -0800 | [diff] [blame] | 435 | |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 436 | /* |
| 437 | * Lock device and try to bind to it. We drop the error |
| 438 | * here and always return 0, because we need to keep trying |
| 439 | * to bind to devices and some drivers will return an error |
| 440 | * simply if it didn't support the device. |
| 441 | * |
| 442 | * driver_probe_device() will spit a warning if there |
| 443 | * is an error. |
| 444 | */ |
| 445 | |
Ming Lei | 49b420a | 2009-01-21 23:27:47 +0800 | [diff] [blame] | 446 | if (!driver_match_device(drv, dev)) |
Arjan van de Ven | 6cd4958 | 2008-09-14 08:32:06 -0700 | [diff] [blame] | 447 | return 0; |
| 448 | |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 449 | if (dev->parent) /* Needed for USB */ |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 450 | device_lock(dev->parent); |
| 451 | device_lock(dev); |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 452 | if (!dev->driver) |
| 453 | driver_probe_device(drv, dev); |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 454 | device_unlock(dev); |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 455 | if (dev->parent) |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 456 | device_unlock(dev->parent); |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 457 | |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 458 | return 0; |
| 459 | } |
| 460 | |
| 461 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 462 | * driver_attach - try to bind driver to devices. |
| 463 | * @drv: driver. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 464 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 465 | * Walk the list of devices that the bus has on it and try to |
| 466 | * match the driver with each one. If driver_probe_device() |
| 467 | * returns 0 and the @dev->driver is set, we've found a |
| 468 | * compatible pair. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 469 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 470 | int driver_attach(struct device_driver *drv) |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 471 | { |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 472 | return bus_for_each_dev(drv->bus, NULL, drv, __driver_attach); |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 473 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 474 | EXPORT_SYMBOL_GPL(driver_attach); |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 475 | |
Stefan Richter | ab71c6f | 2007-06-17 11:02:12 +0200 | [diff] [blame] | 476 | /* |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 477 | * __device_release_driver() must be called with @dev lock held. |
| 478 | * When called for a USB interface, @dev->parent lock must be held as well. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 479 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 480 | static void __device_release_driver(struct device *dev) |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 481 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 482 | struct device_driver *drv; |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 483 | |
Alan Stern | ef2c517 | 2007-11-16 11:57:28 -0500 | [diff] [blame] | 484 | drv = dev->driver; |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 485 | if (drv) { |
Rafael J. Wysocki | e1866b3 | 2011-04-29 00:33:45 +0200 | [diff] [blame] | 486 | pm_runtime_get_sync(dev); |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 487 | |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 488 | driver_sysfs_remove(dev); |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 489 | |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 490 | if (dev->bus) |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 491 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 492 | BUS_NOTIFY_UNBIND_DRIVER, |
| 493 | dev); |
| 494 | |
Rafael J. Wysocki | e1866b3 | 2011-04-29 00:33:45 +0200 | [diff] [blame] | 495 | pm_runtime_put_sync(dev); |
| 496 | |
Alan Stern | 0f836ca | 2006-03-31 11:52:25 -0500 | [diff] [blame] | 497 | if (dev->bus && dev->bus->remove) |
Russell King | 594c828 | 2006-01-05 14:29:51 +0000 | [diff] [blame] | 498 | dev->bus->remove(dev); |
| 499 | else if (drv->remove) |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 500 | drv->remove(dev); |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 501 | devres_release_all(dev); |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 502 | dev->driver = NULL; |
Hans de Goede | 0998d06 | 2012-05-23 00:09:34 +0200 | [diff] [blame] | 503 | dev_set_drvdata(dev, NULL); |
Greg Kroah-Hartman | 8940b4f | 2008-12-16 12:25:49 -0800 | [diff] [blame] | 504 | klist_remove(&dev->p->knode_driver); |
Joerg Roedel | 309b7d6 | 2009-04-24 14:57:00 +0200 | [diff] [blame] | 505 | if (dev->bus) |
| 506 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
| 507 | BUS_NOTIFY_UNBOUND_DRIVER, |
| 508 | dev); |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 509 | |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 510 | } |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 511 | } |
| 512 | |
Stefan Richter | ab71c6f | 2007-06-17 11:02:12 +0200 | [diff] [blame] | 513 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 514 | * device_release_driver - manually detach device from driver. |
| 515 | * @dev: device. |
Stefan Richter | ab71c6f | 2007-06-17 11:02:12 +0200 | [diff] [blame] | 516 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 517 | * Manually detach device from driver. |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 518 | * When called for a USB interface, @dev->parent lock must be held. |
Stefan Richter | ab71c6f | 2007-06-17 11:02:12 +0200 | [diff] [blame] | 519 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 520 | void device_release_driver(struct device *dev) |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 521 | { |
| 522 | /* |
| 523 | * If anyone calls device_release_driver() recursively from |
| 524 | * within their ->remove callback for the same device, they |
| 525 | * will deadlock right here. |
| 526 | */ |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 527 | device_lock(dev); |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 528 | __device_release_driver(dev); |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 529 | device_unlock(dev); |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 530 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 531 | EXPORT_SYMBOL_GPL(device_release_driver); |
mochel@digitalimplant.org | 94e7b1c5 | 2005-03-21 12:25:36 -0800 | [diff] [blame] | 532 | |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 533 | /** |
| 534 | * driver_detach - detach driver from all devices it controls. |
| 535 | * @drv: driver. |
| 536 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 537 | void driver_detach(struct device_driver *drv) |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 538 | { |
Greg Kroah-Hartman | 8940b4f | 2008-12-16 12:25:49 -0800 | [diff] [blame] | 539 | struct device_private *dev_prv; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 540 | struct device *dev; |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 541 | |
| 542 | for (;;) { |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 543 | spin_lock(&drv->p->klist_devices.k_lock); |
| 544 | if (list_empty(&drv->p->klist_devices.k_list)) { |
| 545 | spin_unlock(&drv->p->klist_devices.k_lock); |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 546 | break; |
| 547 | } |
Greg Kroah-Hartman | 8940b4f | 2008-12-16 12:25:49 -0800 | [diff] [blame] | 548 | dev_prv = list_entry(drv->p->klist_devices.k_list.prev, |
| 549 | struct device_private, |
| 550 | knode_driver.n_node); |
| 551 | dev = dev_prv->device; |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 552 | get_device(dev); |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 553 | spin_unlock(&drv->p->klist_devices.k_lock); |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 554 | |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 555 | if (dev->parent) /* Needed for USB */ |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 556 | device_lock(dev->parent); |
| 557 | device_lock(dev); |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 558 | if (dev->driver == drv) |
| 559 | __device_release_driver(dev); |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 560 | device_unlock(dev); |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 561 | if (dev->parent) |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 562 | device_unlock(dev->parent); |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 563 | put_device(dev); |
| 564 | } |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 565 | } |
Greg Kroah-Hartman | b402843 | 2009-05-11 14:16:57 -0700 | [diff] [blame] | 566 | |
| 567 | /* |
| 568 | * These exports can't be _GPL due to .h files using this within them, and it |
| 569 | * might break something that was previously working... |
| 570 | */ |
| 571 | void *dev_get_drvdata(const struct device *dev) |
| 572 | { |
| 573 | if (dev && dev->p) |
| 574 | return dev->p->driver_data; |
| 575 | return NULL; |
| 576 | } |
| 577 | EXPORT_SYMBOL(dev_get_drvdata); |
| 578 | |
Uwe Kleine-König | c870508 | 2011-04-20 09:44:46 +0200 | [diff] [blame] | 579 | int dev_set_drvdata(struct device *dev, void *data) |
Greg Kroah-Hartman | b402843 | 2009-05-11 14:16:57 -0700 | [diff] [blame] | 580 | { |
| 581 | int error; |
| 582 | |
Greg Kroah-Hartman | b402843 | 2009-05-11 14:16:57 -0700 | [diff] [blame] | 583 | if (!dev->p) { |
| 584 | error = device_private_init(dev); |
| 585 | if (error) |
Uwe Kleine-König | c870508 | 2011-04-20 09:44:46 +0200 | [diff] [blame] | 586 | return error; |
Greg Kroah-Hartman | b402843 | 2009-05-11 14:16:57 -0700 | [diff] [blame] | 587 | } |
| 588 | dev->p->driver_data = data; |
Uwe Kleine-König | c870508 | 2011-04-20 09:44:46 +0200 | [diff] [blame] | 589 | return 0; |
Greg Kroah-Hartman | b402843 | 2009-05-11 14:16:57 -0700 | [diff] [blame] | 590 | } |
| 591 | EXPORT_SYMBOL(dev_set_drvdata); |