Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * bus.c - bus driver management |
| 3 | * |
| 4 | * Copyright (c) 2002-3 Patrick Mochel |
| 5 | * Copyright (c) 2002-3 Open Source Development Labs |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 6 | * Copyright (c) 2007 Greg Kroah-Hartman <gregkh@suse.de> |
| 7 | * Copyright (c) 2007 Novell Inc. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * This file is released under the GPLv2 |
| 10 | * |
| 11 | */ |
| 12 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/device.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/errno.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 16 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/init.h> |
| 18 | #include <linux/string.h> |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 19 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include "base.h" |
| 21 | #include "power/power.h" |
| 22 | |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 23 | /* /sys/devices/system */ |
H Hartley Sweeten | 97ec448 | 2012-04-16 18:14:10 -0700 | [diff] [blame] | 24 | static struct kset *system_kset; |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
| 28 | /* |
| 29 | * sysfs bindings for drivers |
| 30 | */ |
| 31 | |
| 32 | #define to_drv_attr(_attr) container_of(_attr, struct driver_attribute, attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 35 | static int __must_check bus_rescan_devices_helper(struct device *dev, |
| 36 | void *data); |
| 37 | |
Greg Kroah-Hartman | 5901d01 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 38 | static struct bus_type *bus_get(struct bus_type *bus) |
| 39 | { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 40 | if (bus) { |
| 41 | kset_get(&bus->p->subsys); |
| 42 | return bus; |
| 43 | } |
| 44 | return NULL; |
Greg Kroah-Hartman | 5901d01 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 45 | } |
| 46 | |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 47 | static void bus_put(struct bus_type *bus) |
| 48 | { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 49 | if (bus) |
| 50 | kset_put(&bus->p->subsys); |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 51 | } |
| 52 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 53 | static ssize_t drv_attr_show(struct kobject *kobj, struct attribute *attr, |
| 54 | char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 56 | struct driver_attribute *drv_attr = to_drv_attr(attr); |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 57 | struct driver_private *drv_priv = to_driver(kobj); |
Dmitry Torokhov | 4a0c20b | 2005-04-29 01:23:47 -0500 | [diff] [blame] | 58 | ssize_t ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | if (drv_attr->show) |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 61 | ret = drv_attr->show(drv_priv->driver, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | return ret; |
| 63 | } |
| 64 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 65 | static ssize_t drv_attr_store(struct kobject *kobj, struct attribute *attr, |
| 66 | const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 68 | struct driver_attribute *drv_attr = to_drv_attr(attr); |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 69 | struct driver_private *drv_priv = to_driver(kobj); |
Dmitry Torokhov | 4a0c20b | 2005-04-29 01:23:47 -0500 | [diff] [blame] | 70 | ssize_t ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | if (drv_attr->store) |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 73 | ret = drv_attr->store(drv_priv->driver, buf, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | return ret; |
| 75 | } |
| 76 | |
Emese Revfy | 52cf25d | 2010-01-19 02:58:23 +0100 | [diff] [blame] | 77 | static const struct sysfs_ops driver_sysfs_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | .show = drv_attr_show, |
| 79 | .store = drv_attr_store, |
| 80 | }; |
| 81 | |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 82 | static void driver_release(struct kobject *kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | { |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 84 | struct driver_private *drv_priv = to_driver(kobj); |
| 85 | |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 86 | pr_debug("driver: '%s': %s\n", kobject_name(kobj), __func__); |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 87 | kfree(drv_priv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | } |
| 89 | |
Greg Kroah-Hartman | a1148fb | 2007-10-11 10:47:49 -0600 | [diff] [blame] | 90 | static struct kobj_type driver_ktype = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | .sysfs_ops = &driver_sysfs_ops, |
| 92 | .release = driver_release, |
| 93 | }; |
| 94 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | /* |
| 96 | * sysfs bindings for buses |
| 97 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 98 | static ssize_t bus_attr_show(struct kobject *kobj, struct attribute *attr, |
| 99 | char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 101 | struct bus_attribute *bus_attr = to_bus_attr(attr); |
Kay Sievers | 6b6e39a | 2010-11-15 23:13:18 +0100 | [diff] [blame] | 102 | struct subsys_private *subsys_priv = to_subsys_private(kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | ssize_t ret = 0; |
| 104 | |
| 105 | if (bus_attr->show) |
Kay Sievers | 6b6e39a | 2010-11-15 23:13:18 +0100 | [diff] [blame] | 106 | ret = bus_attr->show(subsys_priv->bus, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | return ret; |
| 108 | } |
| 109 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 110 | static ssize_t bus_attr_store(struct kobject *kobj, struct attribute *attr, |
| 111 | const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 113 | struct bus_attribute *bus_attr = to_bus_attr(attr); |
Kay Sievers | 6b6e39a | 2010-11-15 23:13:18 +0100 | [diff] [blame] | 114 | struct subsys_private *subsys_priv = to_subsys_private(kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | ssize_t ret = 0; |
| 116 | |
| 117 | if (bus_attr->store) |
Kay Sievers | 6b6e39a | 2010-11-15 23:13:18 +0100 | [diff] [blame] | 118 | ret = bus_attr->store(subsys_priv->bus, buf, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | return ret; |
| 120 | } |
| 121 | |
Emese Revfy | 52cf25d | 2010-01-19 02:58:23 +0100 | [diff] [blame] | 122 | static const struct sysfs_ops bus_sysfs_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | .show = bus_attr_show, |
| 124 | .store = bus_attr_store, |
| 125 | }; |
| 126 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 127 | int bus_create_file(struct bus_type *bus, struct bus_attribute *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | { |
| 129 | int error; |
Greg Kroah-Hartman | 5901d01 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 130 | if (bus_get(bus)) { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 131 | error = sysfs_create_file(&bus->p->subsys.kobj, &attr->attr); |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 132 | bus_put(bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | } else |
| 134 | error = -EINVAL; |
| 135 | return error; |
| 136 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 137 | EXPORT_SYMBOL_GPL(bus_create_file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 139 | void bus_remove_file(struct bus_type *bus, struct bus_attribute *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | { |
Greg Kroah-Hartman | 5901d01 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 141 | if (bus_get(bus)) { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 142 | sysfs_remove_file(&bus->p->subsys.kobj, &attr->attr); |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 143 | bus_put(bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | } |
| 145 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 146 | EXPORT_SYMBOL_GPL(bus_remove_file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
Kay Sievers | 80f03e3 | 2007-05-26 11:21:36 +0200 | [diff] [blame] | 148 | static struct kobj_type bus_ktype = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | .sysfs_ops = &bus_sysfs_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | }; |
| 151 | |
Kay Sievers | 80f03e3 | 2007-05-26 11:21:36 +0200 | [diff] [blame] | 152 | static int bus_uevent_filter(struct kset *kset, struct kobject *kobj) |
| 153 | { |
| 154 | struct kobj_type *ktype = get_ktype(kobj); |
| 155 | |
| 156 | if (ktype == &bus_ktype) |
| 157 | return 1; |
| 158 | return 0; |
| 159 | } |
| 160 | |
Emese Revfy | 9cd4361 | 2009-12-31 14:52:51 +0100 | [diff] [blame] | 161 | static const struct kset_uevent_ops bus_uevent_ops = { |
Kay Sievers | 80f03e3 | 2007-05-26 11:21:36 +0200 | [diff] [blame] | 162 | .filter = bus_uevent_filter, |
| 163 | }; |
| 164 | |
Greg Kroah-Hartman | 59a5483 | 2007-10-29 23:22:26 -0500 | [diff] [blame] | 165 | static struct kset *bus_kset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | |
Russell King | 2139bdd | 2006-02-07 12:58:20 -0800 | [diff] [blame] | 168 | #ifdef CONFIG_HOTPLUG |
Alan Stern | 2b08c8d | 2005-11-23 15:43:50 -0800 | [diff] [blame] | 169 | /* Manually detach a device from its associated driver. */ |
Greg Kroah-Hartman | 151ef38 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 170 | static ssize_t driver_unbind(struct device_driver *drv, |
| 171 | const char *buf, size_t count) |
| 172 | { |
Greg Kroah-Hartman | 5901d01 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 173 | struct bus_type *bus = bus_get(drv->bus); |
Greg Kroah-Hartman | 151ef38 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 174 | struct device *dev; |
| 175 | int err = -ENODEV; |
| 176 | |
Greg Kroah-Hartman | 1f9ffc0 | 2008-01-27 10:29:20 -0800 | [diff] [blame] | 177 | dev = bus_find_device_by_name(bus, NULL, buf); |
Alan Stern | 2b08c8d | 2005-11-23 15:43:50 -0800 | [diff] [blame] | 178 | if (dev && dev->driver == drv) { |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 179 | if (dev->parent) /* Needed for USB */ |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 180 | device_lock(dev->parent); |
Greg Kroah-Hartman | 151ef38 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 181 | device_release_driver(dev); |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 182 | if (dev->parent) |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 183 | device_unlock(dev->parent); |
Greg Kroah-Hartman | 151ef38 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 184 | err = count; |
| 185 | } |
Alan Stern | 2b08c8d | 2005-11-23 15:43:50 -0800 | [diff] [blame] | 186 | put_device(dev); |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 187 | bus_put(bus); |
Alan Stern | 2b08c8d | 2005-11-23 15:43:50 -0800 | [diff] [blame] | 188 | return err; |
Greg Kroah-Hartman | 151ef38 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 189 | } |
| 190 | static DRIVER_ATTR(unbind, S_IWUSR, NULL, driver_unbind); |
| 191 | |
Greg Kroah-Hartman | afdce75 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 192 | /* |
| 193 | * Manually attach a device to a driver. |
| 194 | * Note: the driver must want to bind to the device, |
| 195 | * it is not possible to override the driver's id table. |
| 196 | */ |
| 197 | static ssize_t driver_bind(struct device_driver *drv, |
| 198 | const char *buf, size_t count) |
| 199 | { |
Greg Kroah-Hartman | 5901d01 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 200 | struct bus_type *bus = bus_get(drv->bus); |
Greg Kroah-Hartman | afdce75 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 201 | struct device *dev; |
| 202 | int err = -ENODEV; |
| 203 | |
Greg Kroah-Hartman | 1f9ffc0 | 2008-01-27 10:29:20 -0800 | [diff] [blame] | 204 | dev = bus_find_device_by_name(bus, NULL, buf); |
Ming Lei | 49b420a | 2009-01-21 23:27:47 +0800 | [diff] [blame] | 205 | if (dev && dev->driver == NULL && driver_match_device(drv, dev)) { |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 206 | if (dev->parent) /* Needed for USB */ |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 207 | device_lock(dev->parent); |
| 208 | device_lock(dev); |
Greg Kroah-Hartman | afdce75 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 209 | err = driver_probe_device(drv, dev); |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 210 | device_unlock(dev); |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 211 | if (dev->parent) |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 212 | device_unlock(dev->parent); |
Ryan Wilson | 3722540 | 2006-03-22 16:26:25 -0500 | [diff] [blame] | 213 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 214 | if (err > 0) { |
| 215 | /* success */ |
Ryan Wilson | 3722540 | 2006-03-22 16:26:25 -0500 | [diff] [blame] | 216 | err = count; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 217 | } else if (err == 0) { |
| 218 | /* driver didn't accept device */ |
Ryan Wilson | 3722540 | 2006-03-22 16:26:25 -0500 | [diff] [blame] | 219 | err = -ENODEV; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 220 | } |
Greg Kroah-Hartman | afdce75 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 221 | } |
Alan Stern | 2b08c8d | 2005-11-23 15:43:50 -0800 | [diff] [blame] | 222 | put_device(dev); |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 223 | bus_put(bus); |
Alan Stern | 2b08c8d | 2005-11-23 15:43:50 -0800 | [diff] [blame] | 224 | return err; |
Greg Kroah-Hartman | afdce75 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 225 | } |
| 226 | static DRIVER_ATTR(bind, S_IWUSR, NULL, driver_bind); |
| 227 | |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 228 | static ssize_t show_drivers_autoprobe(struct bus_type *bus, char *buf) |
| 229 | { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 230 | return sprintf(buf, "%d\n", bus->p->drivers_autoprobe); |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 231 | } |
| 232 | |
| 233 | static ssize_t store_drivers_autoprobe(struct bus_type *bus, |
| 234 | const char *buf, size_t count) |
| 235 | { |
| 236 | if (buf[0] == '0') |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 237 | bus->p->drivers_autoprobe = 0; |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 238 | else |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 239 | bus->p->drivers_autoprobe = 1; |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 240 | return count; |
| 241 | } |
| 242 | |
| 243 | static ssize_t store_drivers_probe(struct bus_type *bus, |
| 244 | const char *buf, size_t count) |
| 245 | { |
| 246 | struct device *dev; |
| 247 | |
Greg Kroah-Hartman | 1f9ffc0 | 2008-01-27 10:29:20 -0800 | [diff] [blame] | 248 | dev = bus_find_device_by_name(bus, NULL, buf); |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 249 | if (!dev) |
| 250 | return -ENODEV; |
| 251 | if (bus_rescan_devices_helper(dev, NULL) != 0) |
| 252 | return -EINVAL; |
| 253 | return count; |
| 254 | } |
Russell King | 2139bdd | 2006-02-07 12:58:20 -0800 | [diff] [blame] | 255 | #endif |
Greg Kroah-Hartman | 151ef38 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 256 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 257 | static struct device *next_device(struct klist_iter *i) |
mochel@digitalimplant.org | 465c7a3 | 2005-03-21 11:49:14 -0800 | [diff] [blame] | 258 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 259 | struct klist_node *n = klist_next(i); |
Greg Kroah-Hartman | ae1b417 | 2008-12-16 12:26:21 -0800 | [diff] [blame] | 260 | struct device *dev = NULL; |
| 261 | struct device_private *dev_prv; |
| 262 | |
| 263 | if (n) { |
| 264 | dev_prv = to_device_private_bus(n); |
| 265 | dev = dev_prv->device; |
| 266 | } |
| 267 | return dev; |
mochel@digitalimplant.org | 465c7a3 | 2005-03-21 11:49:14 -0800 | [diff] [blame] | 268 | } |
| 269 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 271 | * bus_for_each_dev - device iterator. |
| 272 | * @bus: bus type. |
| 273 | * @start: device to start iterating from. |
| 274 | * @data: data for the callback. |
| 275 | * @fn: function to be called for each device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 277 | * Iterate over @bus's list of devices, and call @fn for each, |
| 278 | * passing it @data. If @start is not NULL, we use that device to |
| 279 | * begin iterating from. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 281 | * We check the return of @fn each time. If it returns anything |
| 282 | * other than 0, we break out and return that value. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 284 | * NOTE: The device that returns a non-zero value is not retained |
| 285 | * in any way, nor is its refcount incremented. If the caller needs |
Alex Chiang | 0fa1b0a | 2009-05-14 23:15:22 +0200 | [diff] [blame] | 286 | * to retain this data, it should do so, and increment the reference |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 287 | * count in the supplied callback. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 289 | int bus_for_each_dev(struct bus_type *bus, struct device *start, |
| 290 | void *data, int (*fn)(struct device *, void *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | { |
mochel@digitalimplant.org | 465c7a3 | 2005-03-21 11:49:14 -0800 | [diff] [blame] | 292 | struct klist_iter i; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 293 | struct device *dev; |
mochel@digitalimplant.org | 465c7a3 | 2005-03-21 11:49:14 -0800 | [diff] [blame] | 294 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
mochel@digitalimplant.org | 465c7a3 | 2005-03-21 11:49:14 -0800 | [diff] [blame] | 296 | if (!bus) |
| 297 | return -EINVAL; |
| 298 | |
Greg Kroah-Hartman | 7cd9c9b | 2012-04-19 19:17:30 -0700 | [diff] [blame] | 299 | klist_iter_init_node(&bus->p->klist_devices, &i, |
| 300 | (start ? &start->p->knode_bus : NULL)); |
| 301 | while ((dev = next_device(&i)) && !error) |
| 302 | error = fn(dev, data); |
| 303 | klist_iter_exit(&i); |
mochel@digitalimplant.org | 465c7a3 | 2005-03-21 11:49:14 -0800 | [diff] [blame] | 304 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 306 | EXPORT_SYMBOL_GPL(bus_for_each_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | |
Cornelia Huck | 0edb586 | 2005-06-22 16:59:51 +0200 | [diff] [blame] | 308 | /** |
| 309 | * bus_find_device - device iterator for locating a particular device. |
| 310 | * @bus: bus type |
| 311 | * @start: Device to begin with |
| 312 | * @data: Data to pass to match function |
| 313 | * @match: Callback function to check device |
| 314 | * |
| 315 | * This is similar to the bus_for_each_dev() function above, but it |
| 316 | * returns a reference to a device that is 'found' for later use, as |
| 317 | * determined by the @match callback. |
| 318 | * |
| 319 | * The callback should return 0 if the device doesn't match and non-zero |
| 320 | * if it does. If the callback returns non-zero, this function will |
| 321 | * return to the caller and not iterate over any more devices. |
| 322 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 323 | struct device *bus_find_device(struct bus_type *bus, |
| 324 | struct device *start, void *data, |
| 325 | int (*match)(struct device *dev, void *data)) |
Cornelia Huck | 0edb586 | 2005-06-22 16:59:51 +0200 | [diff] [blame] | 326 | { |
| 327 | struct klist_iter i; |
| 328 | struct device *dev; |
| 329 | |
| 330 | if (!bus) |
| 331 | return NULL; |
| 332 | |
Greg Kroah-Hartman | 7cd9c9b | 2012-04-19 19:17:30 -0700 | [diff] [blame] | 333 | klist_iter_init_node(&bus->p->klist_devices, &i, |
| 334 | (start ? &start->p->knode_bus : NULL)); |
Cornelia Huck | 0edb586 | 2005-06-22 16:59:51 +0200 | [diff] [blame] | 335 | while ((dev = next_device(&i))) |
| 336 | if (match(dev, data) && get_device(dev)) |
| 337 | break; |
| 338 | klist_iter_exit(&i); |
| 339 | return dev; |
| 340 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 341 | EXPORT_SYMBOL_GPL(bus_find_device); |
mochel@digitalimplant.org | 38fdac3 | 2005-03-21 12:00:18 -0800 | [diff] [blame] | 342 | |
Greg Kroah-Hartman | 1f9ffc0 | 2008-01-27 10:29:20 -0800 | [diff] [blame] | 343 | static int match_name(struct device *dev, void *data) |
| 344 | { |
| 345 | const char *name = data; |
| 346 | |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 347 | return sysfs_streq(name, dev_name(dev)); |
Greg Kroah-Hartman | 1f9ffc0 | 2008-01-27 10:29:20 -0800 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | /** |
| 351 | * bus_find_device_by_name - device iterator for locating a particular device of a specific name |
| 352 | * @bus: bus type |
| 353 | * @start: Device to begin with |
| 354 | * @name: name of the device to match |
| 355 | * |
| 356 | * This is similar to the bus_find_device() function above, but it handles |
| 357 | * searching by a name automatically, no need to write another strcmp matching |
| 358 | * function. |
| 359 | */ |
| 360 | struct device *bus_find_device_by_name(struct bus_type *bus, |
| 361 | struct device *start, const char *name) |
| 362 | { |
| 363 | return bus_find_device(bus, start, (void *)name, match_name); |
| 364 | } |
| 365 | EXPORT_SYMBOL_GPL(bus_find_device_by_name); |
| 366 | |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 367 | /** |
| 368 | * subsys_find_device_by_id - find a device with a specific enumeration number |
| 369 | * @subsys: subsystem |
| 370 | * @id: index 'id' in struct device |
| 371 | * @hint: device to check first |
| 372 | * |
| 373 | * Check the hint's next object and if it is a match return it directly, |
| 374 | * otherwise, fall back to a full list search. Either way a reference for |
| 375 | * the returned object is taken. |
| 376 | */ |
| 377 | struct device *subsys_find_device_by_id(struct bus_type *subsys, unsigned int id, |
| 378 | struct device *hint) |
| 379 | { |
| 380 | struct klist_iter i; |
| 381 | struct device *dev; |
| 382 | |
| 383 | if (!subsys) |
| 384 | return NULL; |
| 385 | |
| 386 | if (hint) { |
Greg Kroah-Hartman | 7cd9c9b | 2012-04-19 19:17:30 -0700 | [diff] [blame] | 387 | klist_iter_init_node(&subsys->p->klist_devices, &i, &hint->p->knode_bus); |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 388 | dev = next_device(&i); |
| 389 | if (dev && dev->id == id && get_device(dev)) { |
| 390 | klist_iter_exit(&i); |
| 391 | return dev; |
| 392 | } |
| 393 | klist_iter_exit(&i); |
| 394 | } |
| 395 | |
| 396 | klist_iter_init_node(&subsys->p->klist_devices, &i, NULL); |
| 397 | while ((dev = next_device(&i))) { |
| 398 | if (dev->id == id && get_device(dev)) { |
| 399 | klist_iter_exit(&i); |
| 400 | return dev; |
| 401 | } |
| 402 | } |
| 403 | klist_iter_exit(&i); |
| 404 | return NULL; |
| 405 | } |
| 406 | EXPORT_SYMBOL_GPL(subsys_find_device_by_id); |
| 407 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 408 | static struct device_driver *next_driver(struct klist_iter *i) |
mochel@digitalimplant.org | 38fdac3 | 2005-03-21 12:00:18 -0800 | [diff] [blame] | 409 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 410 | struct klist_node *n = klist_next(i); |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 411 | struct driver_private *drv_priv; |
| 412 | |
| 413 | if (n) { |
| 414 | drv_priv = container_of(n, struct driver_private, knode_bus); |
| 415 | return drv_priv->driver; |
| 416 | } |
| 417 | return NULL; |
mochel@digitalimplant.org | 38fdac3 | 2005-03-21 12:00:18 -0800 | [diff] [blame] | 418 | } |
| 419 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 421 | * bus_for_each_drv - driver iterator |
| 422 | * @bus: bus we're dealing with. |
| 423 | * @start: driver to start iterating on. |
| 424 | * @data: data to pass to the callback. |
| 425 | * @fn: function to call for each driver. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 427 | * This is nearly identical to the device iterator above. |
| 428 | * We iterate over each driver that belongs to @bus, and call |
| 429 | * @fn for each. If @fn returns anything but 0, we break out |
| 430 | * and return it. If @start is not NULL, we use it as the head |
| 431 | * of the list. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 433 | * NOTE: we don't return the driver that returns a non-zero |
| 434 | * value, nor do we leave the reference count incremented for that |
| 435 | * driver. If the caller needs to know that info, it must set it |
| 436 | * in the callback. It must also be sure to increment the refcount |
| 437 | * so it doesn't disappear before returning to the caller. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 439 | int bus_for_each_drv(struct bus_type *bus, struct device_driver *start, |
| 440 | void *data, int (*fn)(struct device_driver *, void *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | { |
mochel@digitalimplant.org | 38fdac3 | 2005-03-21 12:00:18 -0800 | [diff] [blame] | 442 | struct klist_iter i; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 443 | struct device_driver *drv; |
mochel@digitalimplant.org | 38fdac3 | 2005-03-21 12:00:18 -0800 | [diff] [blame] | 444 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
mochel@digitalimplant.org | 38fdac3 | 2005-03-21 12:00:18 -0800 | [diff] [blame] | 446 | if (!bus) |
| 447 | return -EINVAL; |
| 448 | |
Greg Kroah-Hartman | 7cd9c9b | 2012-04-19 19:17:30 -0700 | [diff] [blame] | 449 | klist_iter_init_node(&bus->p->klist_drivers, &i, |
| 450 | start ? &start->p->knode_bus : NULL); |
| 451 | while ((drv = next_driver(&i)) && !error) |
| 452 | error = fn(drv, data); |
| 453 | klist_iter_exit(&i); |
mochel@digitalimplant.org | 38fdac3 | 2005-03-21 12:00:18 -0800 | [diff] [blame] | 454 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 456 | EXPORT_SYMBOL_GPL(bus_for_each_drv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | |
Andrew Morton | 4aca67e | 2007-02-13 22:39:26 -0800 | [diff] [blame] | 458 | static int device_add_attrs(struct bus_type *bus, struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | { |
| 460 | int error = 0; |
| 461 | int i; |
| 462 | |
Andrew Morton | 4aca67e | 2007-02-13 22:39:26 -0800 | [diff] [blame] | 463 | if (!bus->dev_attrs) |
| 464 | return 0; |
| 465 | |
| 466 | for (i = 0; attr_name(bus->dev_attrs[i]); i++) { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 467 | error = device_create_file(dev, &bus->dev_attrs[i]); |
Andrew Morton | 4aca67e | 2007-02-13 22:39:26 -0800 | [diff] [blame] | 468 | if (error) { |
| 469 | while (--i >= 0) |
| 470 | device_remove_file(dev, &bus->dev_attrs[i]); |
| 471 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | } |
| 473 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | } |
| 476 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 477 | static void device_remove_attrs(struct bus_type *bus, struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | { |
| 479 | int i; |
| 480 | |
| 481 | if (bus->dev_attrs) { |
| 482 | for (i = 0; attr_name(bus->dev_attrs[i]); i++) |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 483 | device_remove_file(dev, &bus->dev_attrs[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | } |
| 485 | } |
| 486 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 488 | * bus_add_device - add device to bus |
| 489 | * @dev: device being added |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | * |
Alan Stern | 2023c61 | 2009-07-30 15:27:18 -0400 | [diff] [blame] | 491 | * - Add device's bus attributes. |
| 492 | * - Create links to device's bus. |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 493 | * - Add the device to its bus's list of devices. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 495 | int bus_add_device(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 497 | struct bus_type *bus = bus_get(dev->bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | int error = 0; |
| 499 | |
| 500 | if (bus) { |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 501 | pr_debug("bus: '%s': add device %s\n", bus->name, dev_name(dev)); |
Greg Kroah-Hartman | d377e85 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 502 | error = device_add_attrs(bus, dev); |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 503 | if (error) |
Cornelia Huck | 513e733 | 2006-09-22 11:37:08 +0200 | [diff] [blame] | 504 | goto out_put; |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 505 | error = sysfs_create_link(&bus->p->devices_kset->kobj, |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 506 | &dev->kobj, dev_name(dev)); |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 507 | if (error) |
Cornelia Huck | 513e733 | 2006-09-22 11:37:08 +0200 | [diff] [blame] | 508 | goto out_id; |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 509 | error = sysfs_create_link(&dev->kobj, |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 510 | &dev->bus->p->subsys.kobj, "subsystem"); |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 511 | if (error) |
Cornelia Huck | 513e733 | 2006-09-22 11:37:08 +0200 | [diff] [blame] | 512 | goto out_subsys; |
Alan Stern | 2023c61 | 2009-07-30 15:27:18 -0400 | [diff] [blame] | 513 | klist_add_tail(&dev->p->knode_bus, &bus->p->klist_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | } |
Cornelia Huck | 513e733 | 2006-09-22 11:37:08 +0200 | [diff] [blame] | 515 | return 0; |
| 516 | |
Cornelia Huck | 513e733 | 2006-09-22 11:37:08 +0200 | [diff] [blame] | 517 | out_subsys: |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 518 | sysfs_remove_link(&bus->p->devices_kset->kobj, dev_name(dev)); |
Cornelia Huck | 513e733 | 2006-09-22 11:37:08 +0200 | [diff] [blame] | 519 | out_id: |
| 520 | device_remove_attrs(bus, dev); |
| 521 | out_put: |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 522 | bus_put(dev->bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | return error; |
| 524 | } |
| 525 | |
| 526 | /** |
Alan Stern | 2023c61 | 2009-07-30 15:27:18 -0400 | [diff] [blame] | 527 | * bus_probe_device - probe drivers for a new device |
| 528 | * @dev: device to probe |
Kay Sievers | 53877d0 | 2006-04-04 20:42:26 +0200 | [diff] [blame] | 529 | * |
Alan Stern | 2023c61 | 2009-07-30 15:27:18 -0400 | [diff] [blame] | 530 | * - Automatically probe for a driver if the bus allows it. |
Kay Sievers | 53877d0 | 2006-04-04 20:42:26 +0200 | [diff] [blame] | 531 | */ |
Alan Stern | 2023c61 | 2009-07-30 15:27:18 -0400 | [diff] [blame] | 532 | void bus_probe_device(struct device *dev) |
Kay Sievers | 53877d0 | 2006-04-04 20:42:26 +0200 | [diff] [blame] | 533 | { |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 534 | struct bus_type *bus = dev->bus; |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 535 | struct subsys_interface *sif; |
Alan Stern | 2023c61 | 2009-07-30 15:27:18 -0400 | [diff] [blame] | 536 | int ret; |
Kay Sievers | 53877d0 | 2006-04-04 20:42:26 +0200 | [diff] [blame] | 537 | |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 538 | if (!bus) |
| 539 | return; |
| 540 | |
| 541 | if (bus->p->drivers_autoprobe) { |
Alan Stern | 2023c61 | 2009-07-30 15:27:18 -0400 | [diff] [blame] | 542 | ret = device_attach(dev); |
Cornelia Huck | c6a4669 | 2007-02-05 16:15:26 -0800 | [diff] [blame] | 543 | WARN_ON(ret < 0); |
Kay Sievers | 53877d0 | 2006-04-04 20:42:26 +0200 | [diff] [blame] | 544 | } |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 545 | |
| 546 | mutex_lock(&bus->p->mutex); |
| 547 | list_for_each_entry(sif, &bus->p->interfaces, node) |
| 548 | if (sif->add_dev) |
| 549 | sif->add_dev(dev, sif); |
| 550 | mutex_unlock(&bus->p->mutex); |
Kay Sievers | 53877d0 | 2006-04-04 20:42:26 +0200 | [diff] [blame] | 551 | } |
| 552 | |
| 553 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 554 | * bus_remove_device - remove device from bus |
| 555 | * @dev: device to be removed |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | * |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 557 | * - Remove device from all interfaces. |
| 558 | * - Remove symlink from bus' directory. |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 559 | * - Delete device from bus's list. |
| 560 | * - Detach from its driver. |
| 561 | * - Drop reference taken in bus_add_device(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 563 | void bus_remove_device(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | { |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 565 | struct bus_type *bus = dev->bus; |
| 566 | struct subsys_interface *sif; |
Greg Kroah-Hartman | 3f62e57 | 2008-03-13 17:07:03 -0400 | [diff] [blame] | 567 | |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 568 | if (!bus) |
| 569 | return; |
| 570 | |
| 571 | mutex_lock(&bus->p->mutex); |
| 572 | list_for_each_entry(sif, &bus->p->interfaces, node) |
| 573 | if (sif->remove_dev) |
| 574 | sif->remove_dev(dev, sif); |
| 575 | mutex_unlock(&bus->p->mutex); |
| 576 | |
| 577 | sysfs_remove_link(&dev->kobj, "subsystem"); |
| 578 | sysfs_remove_link(&dev->bus->p->devices_kset->kobj, |
| 579 | dev_name(dev)); |
| 580 | device_remove_attrs(dev->bus, dev); |
| 581 | if (klist_node_attached(&dev->p->knode_bus)) |
| 582 | klist_del(&dev->p->knode_bus); |
| 583 | |
| 584 | pr_debug("bus: '%s': remove device %s\n", |
| 585 | dev->bus->name, dev_name(dev)); |
| 586 | device_release_driver(dev); |
| 587 | bus_put(dev->bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | } |
| 589 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 590 | static int driver_add_attrs(struct bus_type *bus, struct device_driver *drv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | { |
| 592 | int error = 0; |
| 593 | int i; |
| 594 | |
| 595 | if (bus->drv_attrs) { |
| 596 | for (i = 0; attr_name(bus->drv_attrs[i]); i++) { |
| 597 | error = driver_create_file(drv, &bus->drv_attrs[i]); |
| 598 | if (error) |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 599 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | } |
| 601 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 602 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | return error; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 604 | err: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | while (--i >= 0) |
| 606 | driver_remove_file(drv, &bus->drv_attrs[i]); |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 607 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | } |
| 609 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 610 | static void driver_remove_attrs(struct bus_type *bus, |
| 611 | struct device_driver *drv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | { |
| 613 | int i; |
| 614 | |
| 615 | if (bus->drv_attrs) { |
| 616 | for (i = 0; attr_name(bus->drv_attrs[i]); i++) |
| 617 | driver_remove_file(drv, &bus->drv_attrs[i]); |
| 618 | } |
| 619 | } |
| 620 | |
Greg Kroah-Hartman | 874c624 | 2005-12-13 15:17:34 -0800 | [diff] [blame] | 621 | #ifdef CONFIG_HOTPLUG |
| 622 | /* |
| 623 | * Thanks to drivers making their tables __devinit, we can't allow manual |
| 624 | * bind and unbind from userspace unless CONFIG_HOTPLUG is enabled. |
| 625 | */ |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 626 | static int __must_check add_bind_files(struct device_driver *drv) |
Greg Kroah-Hartman | 874c624 | 2005-12-13 15:17:34 -0800 | [diff] [blame] | 627 | { |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 628 | int ret; |
| 629 | |
| 630 | ret = driver_create_file(drv, &driver_attr_unbind); |
| 631 | if (ret == 0) { |
| 632 | ret = driver_create_file(drv, &driver_attr_bind); |
| 633 | if (ret) |
| 634 | driver_remove_file(drv, &driver_attr_unbind); |
| 635 | } |
| 636 | return ret; |
Greg Kroah-Hartman | 874c624 | 2005-12-13 15:17:34 -0800 | [diff] [blame] | 637 | } |
| 638 | |
| 639 | static void remove_bind_files(struct device_driver *drv) |
| 640 | { |
| 641 | driver_remove_file(drv, &driver_attr_bind); |
| 642 | driver_remove_file(drv, &driver_attr_unbind); |
| 643 | } |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 644 | |
Kay Sievers | 8380770 | 2007-07-30 02:28:56 +0200 | [diff] [blame] | 645 | static BUS_ATTR(drivers_probe, S_IWUSR, NULL, store_drivers_probe); |
| 646 | static BUS_ATTR(drivers_autoprobe, S_IWUSR | S_IRUGO, |
| 647 | show_drivers_autoprobe, store_drivers_autoprobe); |
| 648 | |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 649 | static int add_probe_files(struct bus_type *bus) |
| 650 | { |
| 651 | int retval; |
| 652 | |
Kay Sievers | 8380770 | 2007-07-30 02:28:56 +0200 | [diff] [blame] | 653 | retval = bus_create_file(bus, &bus_attr_drivers_probe); |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 654 | if (retval) |
| 655 | goto out; |
| 656 | |
Kay Sievers | 8380770 | 2007-07-30 02:28:56 +0200 | [diff] [blame] | 657 | retval = bus_create_file(bus, &bus_attr_drivers_autoprobe); |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 658 | if (retval) |
Kay Sievers | 8380770 | 2007-07-30 02:28:56 +0200 | [diff] [blame] | 659 | bus_remove_file(bus, &bus_attr_drivers_probe); |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 660 | out: |
| 661 | return retval; |
| 662 | } |
| 663 | |
| 664 | static void remove_probe_files(struct bus_type *bus) |
| 665 | { |
Kay Sievers | 8380770 | 2007-07-30 02:28:56 +0200 | [diff] [blame] | 666 | bus_remove_file(bus, &bus_attr_drivers_autoprobe); |
| 667 | bus_remove_file(bus, &bus_attr_drivers_probe); |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 668 | } |
Greg Kroah-Hartman | 874c624 | 2005-12-13 15:17:34 -0800 | [diff] [blame] | 669 | #else |
Yoichi Yuasa | 35acfdd | 2006-07-15 01:30:11 +0900 | [diff] [blame] | 670 | static inline int add_bind_files(struct device_driver *drv) { return 0; } |
Greg Kroah-Hartman | 874c624 | 2005-12-13 15:17:34 -0800 | [diff] [blame] | 671 | static inline void remove_bind_files(struct device_driver *drv) {} |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 672 | static inline int add_probe_files(struct bus_type *bus) { return 0; } |
| 673 | static inline void remove_probe_files(struct bus_type *bus) {} |
Greg Kroah-Hartman | 874c624 | 2005-12-13 15:17:34 -0800 | [diff] [blame] | 674 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 676 | static ssize_t driver_uevent_store(struct device_driver *drv, |
| 677 | const char *buf, size_t count) |
| 678 | { |
| 679 | enum kobject_action action; |
| 680 | |
| 681 | if (kobject_action_type(buf, count, &action) == 0) |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 682 | kobject_uevent(&drv->p->kobj, action); |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 683 | return count; |
| 684 | } |
| 685 | static DRIVER_ATTR(uevent, S_IWUSR, NULL, driver_uevent_store); |
| 686 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 688 | * bus_add_driver - Add a driver to the bus. |
| 689 | * @drv: driver. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | */ |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 691 | int bus_add_driver(struct device_driver *drv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | { |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 693 | struct bus_type *bus; |
| 694 | struct driver_private *priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | int error = 0; |
| 696 | |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 697 | bus = bus_get(drv->bus); |
Jeff Garzik | d9fd4d3b3 | 2006-10-04 07:48:03 -0400 | [diff] [blame] | 698 | if (!bus) |
Greg Kroah-Hartman | 4f6e194 | 2007-04-20 11:29:52 -0700 | [diff] [blame] | 699 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 701 | pr_debug("bus: '%s': add driver %s\n", bus->name, drv->name); |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 702 | |
| 703 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
Cornelia Huck | 0763446 | 2008-02-18 17:04:25 +0100 | [diff] [blame] | 704 | if (!priv) { |
| 705 | error = -ENOMEM; |
| 706 | goto out_put_bus; |
| 707 | } |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 708 | klist_init(&priv->klist_devices, NULL, NULL); |
| 709 | priv->driver = drv; |
| 710 | drv->p = priv; |
Greg Kroah-Hartman | c8e90d8 | 2007-12-17 15:54:39 -0400 | [diff] [blame] | 711 | priv->kobj.kset = bus->p->drivers_kset; |
| 712 | error = kobject_init_and_add(&priv->kobj, &driver_ktype, NULL, |
| 713 | "%s", drv->name); |
Cornelia Huck | dc0afa8 | 2007-07-09 11:39:18 -0700 | [diff] [blame] | 714 | if (error) |
Cornelia Huck | 0763446 | 2008-02-18 17:04:25 +0100 | [diff] [blame] | 715 | goto out_unregister; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 717 | if (drv->bus->p->drivers_autoprobe) { |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 718 | error = driver_attach(drv); |
| 719 | if (error) |
| 720 | goto out_unregister; |
| 721 | } |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 722 | klist_add_tail(&priv->knode_bus, &bus->p->klist_drivers); |
Jeff Garzik | d9fd4d3b3 | 2006-10-04 07:48:03 -0400 | [diff] [blame] | 723 | module_add_driver(drv->owner, drv); |
| 724 | |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 725 | error = driver_create_file(drv, &driver_attr_uevent); |
| 726 | if (error) { |
| 727 | printk(KERN_ERR "%s: uevent attr (%s) failed\n", |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 728 | __func__, drv->name); |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 729 | } |
Jeff Garzik | d9fd4d3b3 | 2006-10-04 07:48:03 -0400 | [diff] [blame] | 730 | error = driver_add_attrs(bus, drv); |
| 731 | if (error) { |
| 732 | /* How the hell do we get out of this pickle? Give up */ |
| 733 | printk(KERN_ERR "%s: driver_add_attrs(%s) failed\n", |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 734 | __func__, drv->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | } |
Dmitry Torokhov | 1a6f2a7 | 2009-10-12 20:17:41 -0700 | [diff] [blame] | 736 | |
| 737 | if (!drv->suppress_bind_attrs) { |
| 738 | error = add_bind_files(drv); |
| 739 | if (error) { |
| 740 | /* Ditto */ |
| 741 | printk(KERN_ERR "%s: add_bind_files(%s) failed\n", |
| 742 | __func__, drv->name); |
| 743 | } |
Jeff Garzik | d9fd4d3b3 | 2006-10-04 07:48:03 -0400 | [diff] [blame] | 744 | } |
| 745 | |
Kay Sievers | 5c8563d | 2009-05-28 14:24:07 -0700 | [diff] [blame] | 746 | return 0; |
Dmitry Torokhov | 1a6f2a7 | 2009-10-12 20:17:41 -0700 | [diff] [blame] | 747 | |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 748 | out_unregister: |
Phil Carmody | 99b28f1 | 2009-12-14 20:28:12 +0200 | [diff] [blame] | 749 | kobject_put(&priv->kobj); |
Kay Sievers | 5c8563d | 2009-05-28 14:24:07 -0700 | [diff] [blame] | 750 | kfree(drv->p); |
| 751 | drv->p = NULL; |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 752 | out_put_bus: |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 753 | bus_put(bus); |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 754 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | } |
| 756 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 758 | * bus_remove_driver - delete driver from bus's knowledge. |
| 759 | * @drv: driver. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 761 | * Detach the driver from the devices it controls, and remove |
| 762 | * it from its bus's list of drivers. Finally, we drop the reference |
| 763 | * to the bus we took in bus_add_driver(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 765 | void bus_remove_driver(struct device_driver *drv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | { |
Jeff Garzik | d9fd4d3b3 | 2006-10-04 07:48:03 -0400 | [diff] [blame] | 767 | if (!drv->bus) |
| 768 | return; |
| 769 | |
Dmitry Torokhov | 1a6f2a7 | 2009-10-12 20:17:41 -0700 | [diff] [blame] | 770 | if (!drv->suppress_bind_attrs) |
| 771 | remove_bind_files(drv); |
Jeff Garzik | d9fd4d3b3 | 2006-10-04 07:48:03 -0400 | [diff] [blame] | 772 | driver_remove_attrs(drv->bus, drv); |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 773 | driver_remove_file(drv, &driver_attr_uevent); |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 774 | klist_remove(&drv->p->knode_bus); |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 775 | pr_debug("bus: '%s': remove driver %s\n", drv->bus->name, drv->name); |
Jeff Garzik | d9fd4d3b3 | 2006-10-04 07:48:03 -0400 | [diff] [blame] | 776 | driver_detach(drv); |
| 777 | module_remove_driver(drv); |
Greg Kroah-Hartman | c10997f | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 778 | kobject_put(&drv->p->kobj); |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 779 | bus_put(drv->bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | } |
| 781 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | /* Helper for bus_rescan_devices's iter */ |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 783 | static int __must_check bus_rescan_devices_helper(struct device *dev, |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 784 | void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | { |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 786 | int ret = 0; |
| 787 | |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 788 | if (!dev->driver) { |
| 789 | if (dev->parent) /* Needed for USB */ |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 790 | device_lock(dev->parent); |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 791 | ret = device_attach(dev); |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 792 | if (dev->parent) |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 793 | device_unlock(dev->parent); |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 794 | } |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 795 | return ret < 0 ? ret : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | } |
| 797 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | /** |
Greg Kroah-Hartman | 23d3d60 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 799 | * bus_rescan_devices - rescan devices on the bus for possible drivers |
| 800 | * @bus: the bus to scan. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | * |
Greg Kroah-Hartman | 23d3d60 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 802 | * This function will look for devices on the bus with no driver |
| 803 | * attached and rescan it against existing drivers to see if it matches |
| 804 | * any by calling device_attach() for the unbound devices. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 806 | int bus_rescan_devices(struct bus_type *bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | { |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 808 | return bus_for_each_dev(bus, NULL, NULL, bus_rescan_devices_helper); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 810 | EXPORT_SYMBOL_GPL(bus_rescan_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | |
Moore, Eric | e935d5d | 2006-03-14 09:18:18 -0700 | [diff] [blame] | 812 | /** |
| 813 | * device_reprobe - remove driver for a device and probe for a new driver |
| 814 | * @dev: the device to reprobe |
| 815 | * |
| 816 | * This function detaches the attached driver (if any) for the given |
| 817 | * device and restarts the driver probing process. It is intended |
| 818 | * to use if probing criteria changed during a devices lifetime and |
| 819 | * driver attachment should change accordingly. |
| 820 | */ |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 821 | int device_reprobe(struct device *dev) |
Moore, Eric | e935d5d | 2006-03-14 09:18:18 -0700 | [diff] [blame] | 822 | { |
| 823 | if (dev->driver) { |
| 824 | if (dev->parent) /* Needed for USB */ |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 825 | device_lock(dev->parent); |
Moore, Eric | e935d5d | 2006-03-14 09:18:18 -0700 | [diff] [blame] | 826 | device_release_driver(dev); |
| 827 | if (dev->parent) |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 828 | device_unlock(dev->parent); |
Moore, Eric | e935d5d | 2006-03-14 09:18:18 -0700 | [diff] [blame] | 829 | } |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 830 | return bus_rescan_devices_helper(dev, NULL); |
Moore, Eric | e935d5d | 2006-03-14 09:18:18 -0700 | [diff] [blame] | 831 | } |
| 832 | EXPORT_SYMBOL_GPL(device_reprobe); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 835 | * find_bus - locate bus by name. |
| 836 | * @name: name of bus. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 838 | * Call kset_find_obj() to iterate over list of buses to |
| 839 | * find a bus by name. Return bus if found. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 841 | * Note that kset_find_obj increments bus' reference count. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | */ |
Adrian Bunk | 7e4ef08 | 2006-06-26 22:26:56 +0200 | [diff] [blame] | 843 | #if 0 |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 844 | struct bus_type *find_bus(char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 846 | struct kobject *k = kset_find_obj(bus_kset, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | return k ? to_bus(k) : NULL; |
| 848 | } |
Adrian Bunk | 7e4ef08 | 2006-06-26 22:26:56 +0200 | [diff] [blame] | 849 | #endif /* 0 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | |
| 851 | |
| 852 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 853 | * bus_add_attrs - Add default attributes for this bus. |
| 854 | * @bus: Bus that has just been registered. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | */ |
| 856 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 857 | static int bus_add_attrs(struct bus_type *bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | { |
| 859 | int error = 0; |
| 860 | int i; |
| 861 | |
| 862 | if (bus->bus_attrs) { |
| 863 | for (i = 0; attr_name(bus->bus_attrs[i]); i++) { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 864 | error = bus_create_file(bus, &bus->bus_attrs[i]); |
Cornelia Huck | dc0afa8 | 2007-07-09 11:39:18 -0700 | [diff] [blame] | 865 | if (error) |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 866 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | } |
| 868 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 869 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | return error; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 871 | err: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | while (--i >= 0) |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 873 | bus_remove_file(bus, &bus->bus_attrs[i]); |
| 874 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | } |
| 876 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 877 | static void bus_remove_attrs(struct bus_type *bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | { |
| 879 | int i; |
| 880 | |
| 881 | if (bus->bus_attrs) { |
| 882 | for (i = 0; attr_name(bus->bus_attrs[i]); i++) |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 883 | bus_remove_file(bus, &bus->bus_attrs[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | } |
| 885 | } |
| 886 | |
James Bottomley | 34bb61f | 2005-09-06 16:56:51 -0700 | [diff] [blame] | 887 | static void klist_devices_get(struct klist_node *n) |
| 888 | { |
Greg Kroah-Hartman | ae1b417 | 2008-12-16 12:26:21 -0800 | [diff] [blame] | 889 | struct device_private *dev_prv = to_device_private_bus(n); |
| 890 | struct device *dev = dev_prv->device; |
James Bottomley | 34bb61f | 2005-09-06 16:56:51 -0700 | [diff] [blame] | 891 | |
| 892 | get_device(dev); |
| 893 | } |
| 894 | |
| 895 | static void klist_devices_put(struct klist_node *n) |
| 896 | { |
Greg Kroah-Hartman | ae1b417 | 2008-12-16 12:26:21 -0800 | [diff] [blame] | 897 | struct device_private *dev_prv = to_device_private_bus(n); |
| 898 | struct device *dev = dev_prv->device; |
James Bottomley | 34bb61f | 2005-09-06 16:56:51 -0700 | [diff] [blame] | 899 | |
| 900 | put_device(dev); |
| 901 | } |
| 902 | |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 903 | static ssize_t bus_uevent_store(struct bus_type *bus, |
| 904 | const char *buf, size_t count) |
| 905 | { |
| 906 | enum kobject_action action; |
| 907 | |
| 908 | if (kobject_action_type(buf, count, &action) == 0) |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 909 | kobject_uevent(&bus->p->subsys.kobj, action); |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 910 | return count; |
| 911 | } |
| 912 | static BUS_ATTR(uevent, S_IWUSR, NULL, bus_uevent_store); |
| 913 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | /** |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 915 | * __bus_register - register a driver-core subsystem |
Randy Dunlap | 78d7955 | 2012-01-21 11:02:28 -0800 | [diff] [blame] | 916 | * @bus: bus to register |
| 917 | * @key: lockdep class key |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | * |
Randy Dunlap | 78d7955 | 2012-01-21 11:02:28 -0800 | [diff] [blame] | 919 | * Once we have that, we register the bus with the kobject |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 920 | * infrastructure, then register the children subsystems it has: |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 921 | * the devices and drivers that belong to the subsystem. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | */ |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 923 | int __bus_register(struct bus_type *bus, struct lock_class_key *key) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | { |
| 925 | int retval; |
Kay Sievers | 6b6e39a | 2010-11-15 23:13:18 +0100 | [diff] [blame] | 926 | struct subsys_private *priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | |
Kay Sievers | 6b6e39a | 2010-11-15 23:13:18 +0100 | [diff] [blame] | 928 | priv = kzalloc(sizeof(struct subsys_private), GFP_KERNEL); |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 929 | if (!priv) |
| 930 | return -ENOMEM; |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 931 | |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 932 | priv->bus = bus; |
| 933 | bus->p = priv; |
| 934 | |
| 935 | BLOCKING_INIT_NOTIFIER_HEAD(&priv->bus_notifier); |
| 936 | |
| 937 | retval = kobject_set_name(&priv->subsys.kobj, "%s", bus->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | if (retval) |
| 939 | goto out; |
| 940 | |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 941 | priv->subsys.kobj.kset = bus_kset; |
| 942 | priv->subsys.kobj.ktype = &bus_ktype; |
| 943 | priv->drivers_autoprobe = 1; |
Greg Kroah-Hartman | d6b05b8 | 2007-09-12 15:06:57 -0700 | [diff] [blame] | 944 | |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 945 | retval = kset_register(&priv->subsys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | if (retval) |
| 947 | goto out; |
| 948 | |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 949 | retval = bus_create_file(bus, &bus_attr_uevent); |
| 950 | if (retval) |
| 951 | goto bus_uevent_fail; |
| 952 | |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 953 | priv->devices_kset = kset_create_and_add("devices", NULL, |
| 954 | &priv->subsys.kobj); |
| 955 | if (!priv->devices_kset) { |
Greg Kroah-Hartman | 3d89959 | 2007-11-01 13:31:26 -0700 | [diff] [blame] | 956 | retval = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | goto bus_devices_fail; |
Greg Kroah-Hartman | 3d89959 | 2007-11-01 13:31:26 -0700 | [diff] [blame] | 958 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 960 | priv->drivers_kset = kset_create_and_add("drivers", NULL, |
| 961 | &priv->subsys.kobj); |
| 962 | if (!priv->drivers_kset) { |
Greg Kroah-Hartman | 6dcec25 | 2007-11-01 13:31:26 -0700 | [diff] [blame] | 963 | retval = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | goto bus_drivers_fail; |
Greg Kroah-Hartman | 6dcec25 | 2007-11-01 13:31:26 -0700 | [diff] [blame] | 965 | } |
mochel@digitalimplant.org | 465c7a3 | 2005-03-21 11:49:14 -0800 | [diff] [blame] | 966 | |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 967 | INIT_LIST_HEAD(&priv->interfaces); |
| 968 | __mutex_init(&priv->mutex, "subsys mutex", key); |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 969 | klist_init(&priv->klist_devices, klist_devices_get, klist_devices_put); |
| 970 | klist_init(&priv->klist_drivers, NULL, NULL); |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 971 | |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 972 | retval = add_probe_files(bus); |
| 973 | if (retval) |
| 974 | goto bus_probe_files_fail; |
| 975 | |
Cornelia Huck | 1bb6881 | 2006-09-22 11:37:04 +0200 | [diff] [blame] | 976 | retval = bus_add_attrs(bus); |
| 977 | if (retval) |
| 978 | goto bus_attrs_fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 980 | pr_debug("bus: '%s': registered\n", bus->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | return 0; |
| 982 | |
Cornelia Huck | 1bb6881 | 2006-09-22 11:37:04 +0200 | [diff] [blame] | 983 | bus_attrs_fail: |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 984 | remove_probe_files(bus); |
| 985 | bus_probe_files_fail: |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 986 | kset_unregister(bus->p->drivers_kset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | bus_drivers_fail: |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 988 | kset_unregister(bus->p->devices_kset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | bus_devices_fail: |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 990 | bus_remove_file(bus, &bus_attr_uevent); |
| 991 | bus_uevent_fail: |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 992 | kset_unregister(&bus->p->subsys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | out: |
Jike Song | 600c20f | 2010-07-15 17:43:54 +0800 | [diff] [blame] | 994 | kfree(bus->p); |
Dave Young | f48f3fe | 2009-02-14 21:23:22 +0800 | [diff] [blame] | 995 | bus->p = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | return retval; |
| 997 | } |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 998 | EXPORT_SYMBOL_GPL(__bus_register); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1001 | * bus_unregister - remove a bus from the system |
| 1002 | * @bus: bus. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1004 | * Unregister the child subsystems and the bus itself. |
| 1005 | * Finally, we call bus_put() to release the refcount |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1007 | void bus_unregister(struct bus_type *bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | { |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 1009 | pr_debug("bus: '%s': unregistering\n", bus->name); |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 1010 | if (bus->dev_root) |
| 1011 | device_unregister(bus->dev_root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | bus_remove_attrs(bus); |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 1013 | remove_probe_files(bus); |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 1014 | kset_unregister(bus->p->drivers_kset); |
| 1015 | kset_unregister(bus->p->devices_kset); |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 1016 | bus_remove_file(bus, &bus_attr_uevent); |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 1017 | kset_unregister(&bus->p->subsys); |
| 1018 | kfree(bus->p); |
Dave Young | f48f3fe | 2009-02-14 21:23:22 +0800 | [diff] [blame] | 1019 | bus->p = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1021 | EXPORT_SYMBOL_GPL(bus_unregister); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 1023 | int bus_register_notifier(struct bus_type *bus, struct notifier_block *nb) |
| 1024 | { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 1025 | return blocking_notifier_chain_register(&bus->p->bus_notifier, nb); |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 1026 | } |
| 1027 | EXPORT_SYMBOL_GPL(bus_register_notifier); |
| 1028 | |
| 1029 | int bus_unregister_notifier(struct bus_type *bus, struct notifier_block *nb) |
| 1030 | { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 1031 | return blocking_notifier_chain_unregister(&bus->p->bus_notifier, nb); |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 1032 | } |
| 1033 | EXPORT_SYMBOL_GPL(bus_unregister_notifier); |
| 1034 | |
Greg Kroah-Hartman | 0fed80f | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 1035 | struct kset *bus_get_kset(struct bus_type *bus) |
| 1036 | { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 1037 | return &bus->p->subsys; |
Greg Kroah-Hartman | 0fed80f | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 1038 | } |
| 1039 | EXPORT_SYMBOL_GPL(bus_get_kset); |
| 1040 | |
Greg Kroah-Hartman | b249072 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 1041 | struct klist *bus_get_device_klist(struct bus_type *bus) |
| 1042 | { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 1043 | return &bus->p->klist_devices; |
Greg Kroah-Hartman | b249072 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 1044 | } |
| 1045 | EXPORT_SYMBOL_GPL(bus_get_device_klist); |
| 1046 | |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 1047 | /* |
Robert P. J. Day | dca25eb | 2010-11-21 08:15:01 -0500 | [diff] [blame] | 1048 | * Yes, this forcibly breaks the klist abstraction temporarily. It |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 1049 | * just wants to sort the klist, not change reference counts and |
| 1050 | * take/drop locks rapidly in the process. It does all this while |
| 1051 | * holding the lock for the list, so objects can't otherwise be |
| 1052 | * added/removed while we're swizzling. |
| 1053 | */ |
| 1054 | static void device_insertion_sort_klist(struct device *a, struct list_head *list, |
| 1055 | int (*compare)(const struct device *a, |
| 1056 | const struct device *b)) |
| 1057 | { |
| 1058 | struct list_head *pos; |
| 1059 | struct klist_node *n; |
Greg Kroah-Hartman | ae1b417 | 2008-12-16 12:26:21 -0800 | [diff] [blame] | 1060 | struct device_private *dev_prv; |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 1061 | struct device *b; |
| 1062 | |
| 1063 | list_for_each(pos, list) { |
| 1064 | n = container_of(pos, struct klist_node, n_node); |
Greg Kroah-Hartman | ae1b417 | 2008-12-16 12:26:21 -0800 | [diff] [blame] | 1065 | dev_prv = to_device_private_bus(n); |
| 1066 | b = dev_prv->device; |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 1067 | if (compare(a, b) <= 0) { |
Greg Kroah-Hartman | ae1b417 | 2008-12-16 12:26:21 -0800 | [diff] [blame] | 1068 | list_move_tail(&a->p->knode_bus.n_node, |
| 1069 | &b->p->knode_bus.n_node); |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 1070 | return; |
| 1071 | } |
| 1072 | } |
Greg Kroah-Hartman | ae1b417 | 2008-12-16 12:26:21 -0800 | [diff] [blame] | 1073 | list_move_tail(&a->p->knode_bus.n_node, list); |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 1074 | } |
| 1075 | |
| 1076 | void bus_sort_breadthfirst(struct bus_type *bus, |
| 1077 | int (*compare)(const struct device *a, |
| 1078 | const struct device *b)) |
| 1079 | { |
| 1080 | LIST_HEAD(sorted_devices); |
| 1081 | struct list_head *pos, *tmp; |
| 1082 | struct klist_node *n; |
Greg Kroah-Hartman | ae1b417 | 2008-12-16 12:26:21 -0800 | [diff] [blame] | 1083 | struct device_private *dev_prv; |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 1084 | struct device *dev; |
| 1085 | struct klist *device_klist; |
| 1086 | |
| 1087 | device_klist = bus_get_device_klist(bus); |
| 1088 | |
| 1089 | spin_lock(&device_klist->k_lock); |
| 1090 | list_for_each_safe(pos, tmp, &device_klist->k_list) { |
| 1091 | n = container_of(pos, struct klist_node, n_node); |
Greg Kroah-Hartman | ae1b417 | 2008-12-16 12:26:21 -0800 | [diff] [blame] | 1092 | dev_prv = to_device_private_bus(n); |
| 1093 | dev = dev_prv->device; |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 1094 | device_insertion_sort_klist(dev, &sorted_devices, compare); |
| 1095 | } |
| 1096 | list_splice(&sorted_devices, &device_klist->k_list); |
| 1097 | spin_unlock(&device_klist->k_lock); |
| 1098 | } |
| 1099 | EXPORT_SYMBOL_GPL(bus_sort_breadthfirst); |
| 1100 | |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 1101 | /** |
| 1102 | * subsys_dev_iter_init - initialize subsys device iterator |
| 1103 | * @iter: subsys iterator to initialize |
| 1104 | * @subsys: the subsys we wanna iterate over |
| 1105 | * @start: the device to start iterating from, if any |
| 1106 | * @type: device_type of the devices to iterate over, NULL for all |
| 1107 | * |
| 1108 | * Initialize subsys iterator @iter such that it iterates over devices |
| 1109 | * of @subsys. If @start is set, the list iteration will start there, |
| 1110 | * otherwise if it is NULL, the iteration starts at the beginning of |
| 1111 | * the list. |
| 1112 | */ |
Greg Kroah-Hartman | 7cd9c9b | 2012-04-19 19:17:30 -0700 | [diff] [blame] | 1113 | void subsys_dev_iter_init(struct subsys_dev_iter *iter, struct bus_type *subsys, |
| 1114 | struct device *start, const struct device_type *type) |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 1115 | { |
| 1116 | struct klist_node *start_knode = NULL; |
| 1117 | |
| 1118 | if (start) |
| 1119 | start_knode = &start->p->knode_bus; |
Greg Kroah-Hartman | 7cd9c9b | 2012-04-19 19:17:30 -0700 | [diff] [blame] | 1120 | klist_iter_init_node(&subsys->p->klist_devices, &iter->ki, start_knode); |
| 1121 | iter->type = type; |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 1122 | } |
| 1123 | EXPORT_SYMBOL_GPL(subsys_dev_iter_init); |
| 1124 | |
| 1125 | /** |
| 1126 | * subsys_dev_iter_next - iterate to the next device |
| 1127 | * @iter: subsys iterator to proceed |
| 1128 | * |
| 1129 | * Proceed @iter to the next device and return it. Returns NULL if |
| 1130 | * iteration is complete. |
| 1131 | * |
| 1132 | * The returned device is referenced and won't be released till |
| 1133 | * iterator is proceed to the next device or exited. The caller is |
| 1134 | * free to do whatever it wants to do with the device including |
| 1135 | * calling back into subsys code. |
| 1136 | */ |
| 1137 | struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter) |
| 1138 | { |
| 1139 | struct klist_node *knode; |
| 1140 | struct device *dev; |
| 1141 | |
| 1142 | for (;;) { |
| 1143 | knode = klist_next(&iter->ki); |
| 1144 | if (!knode) |
| 1145 | return NULL; |
| 1146 | dev = container_of(knode, struct device_private, knode_bus)->device; |
| 1147 | if (!iter->type || iter->type == dev->type) |
| 1148 | return dev; |
| 1149 | } |
| 1150 | } |
| 1151 | EXPORT_SYMBOL_GPL(subsys_dev_iter_next); |
| 1152 | |
| 1153 | /** |
| 1154 | * subsys_dev_iter_exit - finish iteration |
| 1155 | * @iter: subsys iterator to finish |
| 1156 | * |
| 1157 | * Finish an iteration. Always call this function after iteration is |
| 1158 | * complete whether the iteration ran till the end or not. |
| 1159 | */ |
| 1160 | void subsys_dev_iter_exit(struct subsys_dev_iter *iter) |
| 1161 | { |
| 1162 | klist_iter_exit(&iter->ki); |
| 1163 | } |
| 1164 | EXPORT_SYMBOL_GPL(subsys_dev_iter_exit); |
| 1165 | |
| 1166 | int subsys_interface_register(struct subsys_interface *sif) |
| 1167 | { |
| 1168 | struct bus_type *subsys; |
| 1169 | struct subsys_dev_iter iter; |
| 1170 | struct device *dev; |
| 1171 | |
| 1172 | if (!sif || !sif->subsys) |
| 1173 | return -ENODEV; |
| 1174 | |
| 1175 | subsys = bus_get(sif->subsys); |
| 1176 | if (!subsys) |
| 1177 | return -EINVAL; |
| 1178 | |
| 1179 | mutex_lock(&subsys->p->mutex); |
| 1180 | list_add_tail(&sif->node, &subsys->p->interfaces); |
| 1181 | if (sif->add_dev) { |
| 1182 | subsys_dev_iter_init(&iter, subsys, NULL, NULL); |
| 1183 | while ((dev = subsys_dev_iter_next(&iter))) |
| 1184 | sif->add_dev(dev, sif); |
| 1185 | subsys_dev_iter_exit(&iter); |
| 1186 | } |
| 1187 | mutex_unlock(&subsys->p->mutex); |
| 1188 | |
| 1189 | return 0; |
| 1190 | } |
| 1191 | EXPORT_SYMBOL_GPL(subsys_interface_register); |
| 1192 | |
| 1193 | void subsys_interface_unregister(struct subsys_interface *sif) |
| 1194 | { |
Jonghwan Choi | 2b31594 | 2012-01-14 11:06:03 +0900 | [diff] [blame] | 1195 | struct bus_type *subsys; |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 1196 | struct subsys_dev_iter iter; |
| 1197 | struct device *dev; |
| 1198 | |
Jonghwan Choi | 2b31594 | 2012-01-14 11:06:03 +0900 | [diff] [blame] | 1199 | if (!sif || !sif->subsys) |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 1200 | return; |
| 1201 | |
Jonghwan Choi | 2b31594 | 2012-01-14 11:06:03 +0900 | [diff] [blame] | 1202 | subsys = sif->subsys; |
| 1203 | |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 1204 | mutex_lock(&subsys->p->mutex); |
| 1205 | list_del_init(&sif->node); |
| 1206 | if (sif->remove_dev) { |
| 1207 | subsys_dev_iter_init(&iter, subsys, NULL, NULL); |
| 1208 | while ((dev = subsys_dev_iter_next(&iter))) |
| 1209 | sif->remove_dev(dev, sif); |
| 1210 | subsys_dev_iter_exit(&iter); |
| 1211 | } |
| 1212 | mutex_unlock(&subsys->p->mutex); |
| 1213 | |
| 1214 | bus_put(subsys); |
| 1215 | } |
| 1216 | EXPORT_SYMBOL_GPL(subsys_interface_unregister); |
| 1217 | |
| 1218 | static void system_root_device_release(struct device *dev) |
| 1219 | { |
| 1220 | kfree(dev); |
| 1221 | } |
| 1222 | /** |
| 1223 | * subsys_system_register - register a subsystem at /sys/devices/system/ |
Randy Dunlap | 78d7955 | 2012-01-21 11:02:28 -0800 | [diff] [blame] | 1224 | * @subsys: system subsystem |
| 1225 | * @groups: default attributes for the root device |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 1226 | * |
| 1227 | * All 'system' subsystems have a /sys/devices/system/<name> root device |
| 1228 | * with the name of the subsystem. The root device can carry subsystem- |
| 1229 | * wide attributes. All registered devices are below this single root |
| 1230 | * device and are named after the subsystem with a simple enumeration |
| 1231 | * number appended. The registered devices are not explicitely named; |
| 1232 | * only 'id' in the device needs to be set. |
| 1233 | * |
| 1234 | * Do not use this interface for anything new, it exists for compatibility |
| 1235 | * with bad ideas only. New subsystems should use plain subsystems; and |
| 1236 | * add the subsystem-wide attributes should be added to the subsystem |
| 1237 | * directory itself and not some create fake root-device placed in |
| 1238 | * /sys/devices/system/<name>. |
| 1239 | */ |
| 1240 | int subsys_system_register(struct bus_type *subsys, |
| 1241 | const struct attribute_group **groups) |
| 1242 | { |
| 1243 | struct device *dev; |
| 1244 | int err; |
| 1245 | |
| 1246 | err = bus_register(subsys); |
| 1247 | if (err < 0) |
| 1248 | return err; |
| 1249 | |
| 1250 | dev = kzalloc(sizeof(struct device), GFP_KERNEL); |
| 1251 | if (!dev) { |
| 1252 | err = -ENOMEM; |
| 1253 | goto err_dev; |
| 1254 | } |
| 1255 | |
| 1256 | err = dev_set_name(dev, "%s", subsys->name); |
| 1257 | if (err < 0) |
| 1258 | goto err_name; |
| 1259 | |
| 1260 | dev->kobj.parent = &system_kset->kobj; |
| 1261 | dev->groups = groups; |
| 1262 | dev->release = system_root_device_release; |
| 1263 | |
| 1264 | err = device_register(dev); |
| 1265 | if (err < 0) |
| 1266 | goto err_dev_reg; |
| 1267 | |
| 1268 | subsys->dev_root = dev; |
| 1269 | return 0; |
| 1270 | |
| 1271 | err_dev_reg: |
| 1272 | put_device(dev); |
| 1273 | dev = NULL; |
| 1274 | err_name: |
| 1275 | kfree(dev); |
| 1276 | err_dev: |
| 1277 | bus_unregister(subsys); |
| 1278 | return err; |
| 1279 | } |
| 1280 | EXPORT_SYMBOL_GPL(subsys_system_register); |
| 1281 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | int __init buses_init(void) |
| 1283 | { |
Greg Kroah-Hartman | 59a5483 | 2007-10-29 23:22:26 -0500 | [diff] [blame] | 1284 | bus_kset = kset_create_and_add("bus", &bus_uevent_ops, NULL); |
| 1285 | if (!bus_kset) |
| 1286 | return -ENOMEM; |
Kay Sievers | ca22e56 | 2011-12-14 14:29:38 -0800 | [diff] [blame] | 1287 | |
| 1288 | system_kset = kset_create_and_add("system", NULL, &devices_kset->kobj); |
| 1289 | if (!system_kset) |
| 1290 | return -ENOMEM; |
| 1291 | |
Greg Kroah-Hartman | 59a5483 | 2007-10-29 23:22:26 -0500 | [diff] [blame] | 1292 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | } |