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> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/string.h> |
| 18 | #include "base.h" |
| 19 | #include "power/power.h" |
| 20 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr) |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 22 | #define to_bus(obj) container_of(obj, struct bus_type_private, subsys.kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
| 24 | /* |
| 25 | * sysfs bindings for drivers |
| 26 | */ |
| 27 | |
| 28 | #define to_drv_attr(_attr) container_of(_attr, struct driver_attribute, attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
| 30 | |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 31 | static int __must_check bus_rescan_devices_helper(struct device *dev, |
| 32 | void *data); |
| 33 | |
Greg Kroah-Hartman | 5901d01 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 34 | static struct bus_type *bus_get(struct bus_type *bus) |
| 35 | { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 36 | if (bus) { |
| 37 | kset_get(&bus->p->subsys); |
| 38 | return bus; |
| 39 | } |
| 40 | return NULL; |
Greg Kroah-Hartman | 5901d01 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 41 | } |
| 42 | |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 43 | static void bus_put(struct bus_type *bus) |
| 44 | { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 45 | if (bus) |
| 46 | kset_put(&bus->p->subsys); |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 47 | } |
| 48 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 49 | static ssize_t drv_attr_show(struct kobject *kobj, struct attribute *attr, |
| 50 | char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 52 | struct driver_attribute *drv_attr = to_drv_attr(attr); |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 53 | struct driver_private *drv_priv = to_driver(kobj); |
Dmitry Torokhov | 4a0c20b | 2005-04-29 01:23:47 -0500 | [diff] [blame] | 54 | ssize_t ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
| 56 | if (drv_attr->show) |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 57 | ret = drv_attr->show(drv_priv->driver, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | return ret; |
| 59 | } |
| 60 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 61 | static ssize_t drv_attr_store(struct kobject *kobj, struct attribute *attr, |
| 62 | const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 64 | struct driver_attribute *drv_attr = to_drv_attr(attr); |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 65 | struct driver_private *drv_priv = to_driver(kobj); |
Dmitry Torokhov | 4a0c20b | 2005-04-29 01:23:47 -0500 | [diff] [blame] | 66 | ssize_t ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
| 68 | if (drv_attr->store) |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 69 | ret = drv_attr->store(drv_priv->driver, buf, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | return ret; |
| 71 | } |
| 72 | |
| 73 | static struct sysfs_ops driver_sysfs_ops = { |
| 74 | .show = drv_attr_show, |
| 75 | .store = drv_attr_store, |
| 76 | }; |
| 77 | |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 78 | static void driver_release(struct kobject *kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | { |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 80 | struct driver_private *drv_priv = to_driver(kobj); |
| 81 | |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 82 | pr_debug("driver: '%s': %s\n", kobject_name(kobj), __func__); |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 83 | kfree(drv_priv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | } |
| 85 | |
Greg Kroah-Hartman | a1148fb | 2007-10-11 10:47:49 -0600 | [diff] [blame] | 86 | static struct kobj_type driver_ktype = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | .sysfs_ops = &driver_sysfs_ops, |
| 88 | .release = driver_release, |
| 89 | }; |
| 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | /* |
| 92 | * sysfs bindings for buses |
| 93 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 94 | static ssize_t bus_attr_show(struct kobject *kobj, struct attribute *attr, |
| 95 | char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 97 | struct bus_attribute *bus_attr = to_bus_attr(attr); |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 98 | struct bus_type_private *bus_priv = to_bus(kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | ssize_t ret = 0; |
| 100 | |
| 101 | if (bus_attr->show) |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 102 | ret = bus_attr->show(bus_priv->bus, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | return ret; |
| 104 | } |
| 105 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 106 | static ssize_t bus_attr_store(struct kobject *kobj, struct attribute *attr, |
| 107 | const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 109 | struct bus_attribute *bus_attr = to_bus_attr(attr); |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 110 | struct bus_type_private *bus_priv = to_bus(kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | ssize_t ret = 0; |
| 112 | |
| 113 | if (bus_attr->store) |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 114 | ret = bus_attr->store(bus_priv->bus, buf, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | return ret; |
| 116 | } |
| 117 | |
| 118 | static struct sysfs_ops bus_sysfs_ops = { |
| 119 | .show = bus_attr_show, |
| 120 | .store = bus_attr_store, |
| 121 | }; |
| 122 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 123 | int bus_create_file(struct bus_type *bus, struct bus_attribute *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | { |
| 125 | int error; |
Greg Kroah-Hartman | 5901d01 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 126 | if (bus_get(bus)) { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 127 | error = sysfs_create_file(&bus->p->subsys.kobj, &attr->attr); |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 128 | bus_put(bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | } else |
| 130 | error = -EINVAL; |
| 131 | return error; |
| 132 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 133 | EXPORT_SYMBOL_GPL(bus_create_file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 135 | void bus_remove_file(struct bus_type *bus, struct bus_attribute *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | { |
Greg Kroah-Hartman | 5901d01 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 137 | if (bus_get(bus)) { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 138 | sysfs_remove_file(&bus->p->subsys.kobj, &attr->attr); |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 139 | bus_put(bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | } |
| 141 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 142 | EXPORT_SYMBOL_GPL(bus_remove_file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
Kay Sievers | 80f03e3 | 2007-05-26 11:21:36 +0200 | [diff] [blame] | 144 | static struct kobj_type bus_ktype = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | .sysfs_ops = &bus_sysfs_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | }; |
| 147 | |
Kay Sievers | 80f03e3 | 2007-05-26 11:21:36 +0200 | [diff] [blame] | 148 | static int bus_uevent_filter(struct kset *kset, struct kobject *kobj) |
| 149 | { |
| 150 | struct kobj_type *ktype = get_ktype(kobj); |
| 151 | |
| 152 | if (ktype == &bus_ktype) |
| 153 | return 1; |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | static struct kset_uevent_ops bus_uevent_ops = { |
| 158 | .filter = bus_uevent_filter, |
| 159 | }; |
| 160 | |
Greg Kroah-Hartman | 59a5483 | 2007-10-29 23:22:26 -0500 | [diff] [blame] | 161 | static struct kset *bus_kset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
Russell King | 2139bdd | 2006-02-07 12:58:20 -0800 | [diff] [blame] | 164 | #ifdef CONFIG_HOTPLUG |
Alan Stern | 2b08c8d | 2005-11-23 15:43:50 -0800 | [diff] [blame] | 165 | /* Manually detach a device from its associated driver. */ |
Greg Kroah-Hartman | 151ef38 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 166 | static ssize_t driver_unbind(struct device_driver *drv, |
| 167 | const char *buf, size_t count) |
| 168 | { |
Greg Kroah-Hartman | 5901d01 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 169 | struct bus_type *bus = bus_get(drv->bus); |
Greg Kroah-Hartman | 151ef38 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 170 | struct device *dev; |
| 171 | int err = -ENODEV; |
| 172 | |
Greg Kroah-Hartman | 1f9ffc0 | 2008-01-27 10:29:20 -0800 | [diff] [blame] | 173 | dev = bus_find_device_by_name(bus, NULL, buf); |
Alan Stern | 2b08c8d | 2005-11-23 15:43:50 -0800 | [diff] [blame] | 174 | if (dev && dev->driver == drv) { |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 175 | if (dev->parent) /* Needed for USB */ |
| 176 | down(&dev->parent->sem); |
Greg Kroah-Hartman | 151ef38 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 177 | device_release_driver(dev); |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 178 | if (dev->parent) |
| 179 | up(&dev->parent->sem); |
Greg Kroah-Hartman | 151ef38 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 180 | err = count; |
| 181 | } |
Alan Stern | 2b08c8d | 2005-11-23 15:43:50 -0800 | [diff] [blame] | 182 | put_device(dev); |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 183 | bus_put(bus); |
Alan Stern | 2b08c8d | 2005-11-23 15:43:50 -0800 | [diff] [blame] | 184 | return err; |
Greg Kroah-Hartman | 151ef38 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 185 | } |
| 186 | static DRIVER_ATTR(unbind, S_IWUSR, NULL, driver_unbind); |
| 187 | |
Greg Kroah-Hartman | afdce75 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 188 | /* |
| 189 | * Manually attach a device to a driver. |
| 190 | * Note: the driver must want to bind to the device, |
| 191 | * it is not possible to override the driver's id table. |
| 192 | */ |
| 193 | static ssize_t driver_bind(struct device_driver *drv, |
| 194 | const char *buf, size_t count) |
| 195 | { |
Greg Kroah-Hartman | 5901d01 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 196 | struct bus_type *bus = bus_get(drv->bus); |
Greg Kroah-Hartman | afdce75 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 197 | struct device *dev; |
| 198 | int err = -ENODEV; |
| 199 | |
Greg Kroah-Hartman | 1f9ffc0 | 2008-01-27 10:29:20 -0800 | [diff] [blame] | 200 | dev = bus_find_device_by_name(bus, NULL, buf); |
Ming Lei | 49b420a | 2009-01-21 23:27:47 +0800 | [diff] [blame^] | 201 | if (dev && dev->driver == NULL && driver_match_device(drv, dev)) { |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 202 | if (dev->parent) /* Needed for USB */ |
| 203 | down(&dev->parent->sem); |
Greg Kroah-Hartman | afdce75 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 204 | down(&dev->sem); |
| 205 | err = driver_probe_device(drv, dev); |
| 206 | up(&dev->sem); |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 207 | if (dev->parent) |
| 208 | up(&dev->parent->sem); |
Ryan Wilson | 3722540 | 2006-03-22 16:26:25 -0500 | [diff] [blame] | 209 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 210 | if (err > 0) { |
| 211 | /* success */ |
Ryan Wilson | 3722540 | 2006-03-22 16:26:25 -0500 | [diff] [blame] | 212 | err = count; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 213 | } else if (err == 0) { |
| 214 | /* driver didn't accept device */ |
Ryan Wilson | 3722540 | 2006-03-22 16:26:25 -0500 | [diff] [blame] | 215 | err = -ENODEV; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 216 | } |
Greg Kroah-Hartman | afdce75 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 217 | } |
Alan Stern | 2b08c8d | 2005-11-23 15:43:50 -0800 | [diff] [blame] | 218 | put_device(dev); |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 219 | bus_put(bus); |
Alan Stern | 2b08c8d | 2005-11-23 15:43:50 -0800 | [diff] [blame] | 220 | return err; |
Greg Kroah-Hartman | afdce75 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 221 | } |
| 222 | static DRIVER_ATTR(bind, S_IWUSR, NULL, driver_bind); |
| 223 | |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 224 | static ssize_t show_drivers_autoprobe(struct bus_type *bus, char *buf) |
| 225 | { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 226 | return sprintf(buf, "%d\n", bus->p->drivers_autoprobe); |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 227 | } |
| 228 | |
| 229 | static ssize_t store_drivers_autoprobe(struct bus_type *bus, |
| 230 | const char *buf, size_t count) |
| 231 | { |
| 232 | if (buf[0] == '0') |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 233 | bus->p->drivers_autoprobe = 0; |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 234 | else |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 235 | bus->p->drivers_autoprobe = 1; |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 236 | return count; |
| 237 | } |
| 238 | |
| 239 | static ssize_t store_drivers_probe(struct bus_type *bus, |
| 240 | const char *buf, size_t count) |
| 241 | { |
| 242 | struct device *dev; |
| 243 | |
Greg Kroah-Hartman | 1f9ffc0 | 2008-01-27 10:29:20 -0800 | [diff] [blame] | 244 | dev = bus_find_device_by_name(bus, NULL, buf); |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 245 | if (!dev) |
| 246 | return -ENODEV; |
| 247 | if (bus_rescan_devices_helper(dev, NULL) != 0) |
| 248 | return -EINVAL; |
| 249 | return count; |
| 250 | } |
Russell King | 2139bdd | 2006-02-07 12:58:20 -0800 | [diff] [blame] | 251 | #endif |
Greg Kroah-Hartman | 151ef38 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 252 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 253 | static struct device *next_device(struct klist_iter *i) |
mochel@digitalimplant.org | 465c7a3 | 2005-03-21 11:49:14 -0800 | [diff] [blame] | 254 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 255 | struct klist_node *n = klist_next(i); |
Greg Kroah-Hartman | 4db8e28 | 2009-01-09 14:32:46 -0800 | [diff] [blame] | 256 | return n ? container_of(n, struct device, knode_bus) : NULL; |
mochel@digitalimplant.org | 465c7a3 | 2005-03-21 11:49:14 -0800 | [diff] [blame] | 257 | } |
| 258 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 260 | * bus_for_each_dev - device iterator. |
| 261 | * @bus: bus type. |
| 262 | * @start: device to start iterating from. |
| 263 | * @data: data for the callback. |
| 264 | * @fn: function to be called for each device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 266 | * Iterate over @bus's list of devices, and call @fn for each, |
| 267 | * passing it @data. If @start is not NULL, we use that device to |
| 268 | * begin iterating from. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 270 | * We check the return of @fn each time. If it returns anything |
| 271 | * other than 0, we break out and return that value. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 273 | * NOTE: The device that returns a non-zero value is not retained |
| 274 | * in any way, nor is its refcount incremented. If the caller needs |
| 275 | * to retain this data, it should do, and increment the reference |
| 276 | * count in the supplied callback. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 278 | int bus_for_each_dev(struct bus_type *bus, struct device *start, |
| 279 | void *data, int (*fn)(struct device *, void *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | { |
mochel@digitalimplant.org | 465c7a3 | 2005-03-21 11:49:14 -0800 | [diff] [blame] | 281 | struct klist_iter i; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 282 | struct device *dev; |
mochel@digitalimplant.org | 465c7a3 | 2005-03-21 11:49:14 -0800 | [diff] [blame] | 283 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
mochel@digitalimplant.org | 465c7a3 | 2005-03-21 11:49:14 -0800 | [diff] [blame] | 285 | if (!bus) |
| 286 | return -EINVAL; |
| 287 | |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 288 | klist_iter_init_node(&bus->p->klist_devices, &i, |
Greg Kroah-Hartman | 4db8e28 | 2009-01-09 14:32:46 -0800 | [diff] [blame] | 289 | (start ? &start->knode_bus : NULL)); |
mochel@digitalimplant.org | 465c7a3 | 2005-03-21 11:49:14 -0800 | [diff] [blame] | 290 | while ((dev = next_device(&i)) && !error) |
| 291 | error = fn(dev, data); |
| 292 | klist_iter_exit(&i); |
| 293 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 295 | EXPORT_SYMBOL_GPL(bus_for_each_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | |
Cornelia Huck | 0edb586 | 2005-06-22 16:59:51 +0200 | [diff] [blame] | 297 | /** |
| 298 | * bus_find_device - device iterator for locating a particular device. |
| 299 | * @bus: bus type |
| 300 | * @start: Device to begin with |
| 301 | * @data: Data to pass to match function |
| 302 | * @match: Callback function to check device |
| 303 | * |
| 304 | * This is similar to the bus_for_each_dev() function above, but it |
| 305 | * returns a reference to a device that is 'found' for later use, as |
| 306 | * determined by the @match callback. |
| 307 | * |
| 308 | * The callback should return 0 if the device doesn't match and non-zero |
| 309 | * if it does. If the callback returns non-zero, this function will |
| 310 | * return to the caller and not iterate over any more devices. |
| 311 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 312 | struct device *bus_find_device(struct bus_type *bus, |
| 313 | struct device *start, void *data, |
| 314 | int (*match)(struct device *dev, void *data)) |
Cornelia Huck | 0edb586 | 2005-06-22 16:59:51 +0200 | [diff] [blame] | 315 | { |
| 316 | struct klist_iter i; |
| 317 | struct device *dev; |
| 318 | |
| 319 | if (!bus) |
| 320 | return NULL; |
| 321 | |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 322 | klist_iter_init_node(&bus->p->klist_devices, &i, |
Greg Kroah-Hartman | 4db8e28 | 2009-01-09 14:32:46 -0800 | [diff] [blame] | 323 | (start ? &start->knode_bus : NULL)); |
Cornelia Huck | 0edb586 | 2005-06-22 16:59:51 +0200 | [diff] [blame] | 324 | while ((dev = next_device(&i))) |
| 325 | if (match(dev, data) && get_device(dev)) |
| 326 | break; |
| 327 | klist_iter_exit(&i); |
| 328 | return dev; |
| 329 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 330 | EXPORT_SYMBOL_GPL(bus_find_device); |
mochel@digitalimplant.org | 38fdac3 | 2005-03-21 12:00:18 -0800 | [diff] [blame] | 331 | |
Greg Kroah-Hartman | 1f9ffc0 | 2008-01-27 10:29:20 -0800 | [diff] [blame] | 332 | static int match_name(struct device *dev, void *data) |
| 333 | { |
| 334 | const char *name = data; |
| 335 | |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 336 | return sysfs_streq(name, dev_name(dev)); |
Greg Kroah-Hartman | 1f9ffc0 | 2008-01-27 10:29:20 -0800 | [diff] [blame] | 337 | } |
| 338 | |
| 339 | /** |
| 340 | * bus_find_device_by_name - device iterator for locating a particular device of a specific name |
| 341 | * @bus: bus type |
| 342 | * @start: Device to begin with |
| 343 | * @name: name of the device to match |
| 344 | * |
| 345 | * This is similar to the bus_find_device() function above, but it handles |
| 346 | * searching by a name automatically, no need to write another strcmp matching |
| 347 | * function. |
| 348 | */ |
| 349 | struct device *bus_find_device_by_name(struct bus_type *bus, |
| 350 | struct device *start, const char *name) |
| 351 | { |
| 352 | return bus_find_device(bus, start, (void *)name, match_name); |
| 353 | } |
| 354 | EXPORT_SYMBOL_GPL(bus_find_device_by_name); |
| 355 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 356 | static struct device_driver *next_driver(struct klist_iter *i) |
mochel@digitalimplant.org | 38fdac3 | 2005-03-21 12:00:18 -0800 | [diff] [blame] | 357 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 358 | struct klist_node *n = klist_next(i); |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 359 | struct driver_private *drv_priv; |
| 360 | |
| 361 | if (n) { |
| 362 | drv_priv = container_of(n, struct driver_private, knode_bus); |
| 363 | return drv_priv->driver; |
| 364 | } |
| 365 | return NULL; |
mochel@digitalimplant.org | 38fdac3 | 2005-03-21 12:00:18 -0800 | [diff] [blame] | 366 | } |
| 367 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 369 | * bus_for_each_drv - driver iterator |
| 370 | * @bus: bus we're dealing with. |
| 371 | * @start: driver to start iterating on. |
| 372 | * @data: data to pass to the callback. |
| 373 | * @fn: function to call for each driver. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 375 | * This is nearly identical to the device iterator above. |
| 376 | * We iterate over each driver that belongs to @bus, and call |
| 377 | * @fn for each. If @fn returns anything but 0, we break out |
| 378 | * and return it. If @start is not NULL, we use it as the head |
| 379 | * of the list. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 381 | * NOTE: we don't return the driver that returns a non-zero |
| 382 | * value, nor do we leave the reference count incremented for that |
| 383 | * driver. If the caller needs to know that info, it must set it |
| 384 | * in the callback. It must also be sure to increment the refcount |
| 385 | * so it doesn't disappear before returning to the caller. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 387 | int bus_for_each_drv(struct bus_type *bus, struct device_driver *start, |
| 388 | void *data, int (*fn)(struct device_driver *, void *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | { |
mochel@digitalimplant.org | 38fdac3 | 2005-03-21 12:00:18 -0800 | [diff] [blame] | 390 | struct klist_iter i; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 391 | struct device_driver *drv; |
mochel@digitalimplant.org | 38fdac3 | 2005-03-21 12:00:18 -0800 | [diff] [blame] | 392 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | |
mochel@digitalimplant.org | 38fdac3 | 2005-03-21 12:00:18 -0800 | [diff] [blame] | 394 | if (!bus) |
| 395 | return -EINVAL; |
| 396 | |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 397 | klist_iter_init_node(&bus->p->klist_drivers, &i, |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 398 | start ? &start->p->knode_bus : NULL); |
mochel@digitalimplant.org | 38fdac3 | 2005-03-21 12:00:18 -0800 | [diff] [blame] | 399 | while ((drv = next_driver(&i)) && !error) |
| 400 | error = fn(drv, data); |
| 401 | klist_iter_exit(&i); |
| 402 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 404 | EXPORT_SYMBOL_GPL(bus_for_each_drv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | |
Andrew Morton | 4aca67e | 2007-02-13 22:39:26 -0800 | [diff] [blame] | 406 | static int device_add_attrs(struct bus_type *bus, struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | { |
| 408 | int error = 0; |
| 409 | int i; |
| 410 | |
Andrew Morton | 4aca67e | 2007-02-13 22:39:26 -0800 | [diff] [blame] | 411 | if (!bus->dev_attrs) |
| 412 | return 0; |
| 413 | |
| 414 | for (i = 0; attr_name(bus->dev_attrs[i]); i++) { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 415 | error = device_create_file(dev, &bus->dev_attrs[i]); |
Andrew Morton | 4aca67e | 2007-02-13 22:39:26 -0800 | [diff] [blame] | 416 | if (error) { |
| 417 | while (--i >= 0) |
| 418 | device_remove_file(dev, &bus->dev_attrs[i]); |
| 419 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | } |
| 421 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | } |
| 424 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 425 | static void device_remove_attrs(struct bus_type *bus, struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | { |
| 427 | int i; |
| 428 | |
| 429 | if (bus->dev_attrs) { |
| 430 | for (i = 0; attr_name(bus->dev_attrs[i]); i++) |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 431 | device_remove_file(dev, &bus->dev_attrs[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | } |
| 433 | } |
| 434 | |
Kay Sievers | b9cafc7 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 435 | #ifdef CONFIG_SYSFS_DEPRECATED |
| 436 | static int make_deprecated_bus_links(struct device *dev) |
| 437 | { |
| 438 | return sysfs_create_link(&dev->kobj, |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 439 | &dev->bus->p->subsys.kobj, "bus"); |
Kay Sievers | b9cafc7 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 440 | } |
| 441 | |
| 442 | static void remove_deprecated_bus_links(struct device *dev) |
| 443 | { |
| 444 | sysfs_remove_link(&dev->kobj, "bus"); |
| 445 | } |
| 446 | #else |
| 447 | static inline int make_deprecated_bus_links(struct device *dev) { return 0; } |
| 448 | static inline void remove_deprecated_bus_links(struct device *dev) { } |
| 449 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | |
| 451 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 452 | * bus_add_device - add device to bus |
| 453 | * @dev: device being added |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 455 | * - Add the device to its bus's list of devices. |
| 456 | * - Create link to device's bus. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 458 | int bus_add_device(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 460 | struct bus_type *bus = bus_get(dev->bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | int error = 0; |
| 462 | |
| 463 | if (bus) { |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 464 | 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] | 465 | error = device_add_attrs(bus, dev); |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 466 | if (error) |
Cornelia Huck | 513e733 | 2006-09-22 11:37:08 +0200 | [diff] [blame] | 467 | goto out_put; |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 468 | error = sysfs_create_link(&bus->p->devices_kset->kobj, |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 469 | &dev->kobj, dev_name(dev)); |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 470 | if (error) |
Cornelia Huck | 513e733 | 2006-09-22 11:37:08 +0200 | [diff] [blame] | 471 | goto out_id; |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 472 | error = sysfs_create_link(&dev->kobj, |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 473 | &dev->bus->p->subsys.kobj, "subsystem"); |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 474 | if (error) |
Cornelia Huck | 513e733 | 2006-09-22 11:37:08 +0200 | [diff] [blame] | 475 | goto out_subsys; |
Kay Sievers | b9cafc7 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 476 | error = make_deprecated_bus_links(dev); |
Cornelia Huck | 513e733 | 2006-09-22 11:37:08 +0200 | [diff] [blame] | 477 | if (error) |
| 478 | goto out_deprecated; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | } |
Cornelia Huck | 513e733 | 2006-09-22 11:37:08 +0200 | [diff] [blame] | 480 | return 0; |
| 481 | |
| 482 | out_deprecated: |
| 483 | sysfs_remove_link(&dev->kobj, "subsystem"); |
| 484 | out_subsys: |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 485 | sysfs_remove_link(&bus->p->devices_kset->kobj, dev_name(dev)); |
Cornelia Huck | 513e733 | 2006-09-22 11:37:08 +0200 | [diff] [blame] | 486 | out_id: |
| 487 | device_remove_attrs(bus, dev); |
| 488 | out_put: |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 489 | bus_put(dev->bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | return error; |
| 491 | } |
| 492 | |
| 493 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 494 | * bus_attach_device - add device to bus |
| 495 | * @dev: device tried to attach to a driver |
Kay Sievers | 53877d0 | 2006-04-04 20:42:26 +0200 | [diff] [blame] | 496 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 497 | * - Add device to bus's list of devices. |
| 498 | * - Try to attach to driver. |
Kay Sievers | 53877d0 | 2006-04-04 20:42:26 +0200 | [diff] [blame] | 499 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 500 | void bus_attach_device(struct device *dev) |
Kay Sievers | 53877d0 | 2006-04-04 20:42:26 +0200 | [diff] [blame] | 501 | { |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 502 | struct bus_type *bus = dev->bus; |
| 503 | int ret = 0; |
Kay Sievers | 53877d0 | 2006-04-04 20:42:26 +0200 | [diff] [blame] | 504 | |
| 505 | if (bus) { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 506 | if (bus->p->drivers_autoprobe) |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 507 | ret = device_attach(dev); |
Cornelia Huck | c6a4669 | 2007-02-05 16:15:26 -0800 | [diff] [blame] | 508 | WARN_ON(ret < 0); |
| 509 | if (ret >= 0) |
Greg Kroah-Hartman | 4db8e28 | 2009-01-09 14:32:46 -0800 | [diff] [blame] | 510 | klist_add_tail(&dev->knode_bus, &bus->p->klist_devices); |
Kay Sievers | 53877d0 | 2006-04-04 20:42:26 +0200 | [diff] [blame] | 511 | } |
| 512 | } |
| 513 | |
| 514 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 515 | * bus_remove_device - remove device from bus |
| 516 | * @dev: device to be removed |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 518 | * - Remove symlink from bus's directory. |
| 519 | * - Delete device from bus's list. |
| 520 | * - Detach from its driver. |
| 521 | * - Drop reference taken in bus_add_device(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 523 | void bus_remove_device(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | { |
| 525 | if (dev->bus) { |
Kay Sievers | b9d9c82 | 2006-06-15 15:31:56 +0200 | [diff] [blame] | 526 | sysfs_remove_link(&dev->kobj, "subsystem"); |
Kay Sievers | b9cafc7 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 527 | remove_deprecated_bus_links(dev); |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 528 | sysfs_remove_link(&dev->bus->p->devices_kset->kobj, |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 529 | dev_name(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | device_remove_attrs(dev->bus, dev); |
Greg Kroah-Hartman | 4db8e28 | 2009-01-09 14:32:46 -0800 | [diff] [blame] | 531 | if (klist_node_attached(&dev->knode_bus)) |
| 532 | klist_del(&dev->knode_bus); |
Greg Kroah-Hartman | 3f62e57 | 2008-03-13 17:07:03 -0400 | [diff] [blame] | 533 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 534 | pr_debug("bus: '%s': remove device %s\n", |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 535 | dev->bus->name, dev_name(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | device_release_driver(dev); |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 537 | bus_put(dev->bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | } |
| 539 | } |
| 540 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 541 | 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] | 542 | { |
| 543 | int error = 0; |
| 544 | int i; |
| 545 | |
| 546 | if (bus->drv_attrs) { |
| 547 | for (i = 0; attr_name(bus->drv_attrs[i]); i++) { |
| 548 | error = driver_create_file(drv, &bus->drv_attrs[i]); |
| 549 | if (error) |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 550 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | } |
| 552 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 553 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | return error; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 555 | err: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | while (--i >= 0) |
| 557 | driver_remove_file(drv, &bus->drv_attrs[i]); |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 558 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | } |
| 560 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 561 | static void driver_remove_attrs(struct bus_type *bus, |
| 562 | struct device_driver *drv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | { |
| 564 | int i; |
| 565 | |
| 566 | if (bus->drv_attrs) { |
| 567 | for (i = 0; attr_name(bus->drv_attrs[i]); i++) |
| 568 | driver_remove_file(drv, &bus->drv_attrs[i]); |
| 569 | } |
| 570 | } |
| 571 | |
Greg Kroah-Hartman | 874c624 | 2005-12-13 15:17:34 -0800 | [diff] [blame] | 572 | #ifdef CONFIG_HOTPLUG |
| 573 | /* |
| 574 | * Thanks to drivers making their tables __devinit, we can't allow manual |
| 575 | * bind and unbind from userspace unless CONFIG_HOTPLUG is enabled. |
| 576 | */ |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 577 | static int __must_check add_bind_files(struct device_driver *drv) |
Greg Kroah-Hartman | 874c624 | 2005-12-13 15:17:34 -0800 | [diff] [blame] | 578 | { |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 579 | int ret; |
| 580 | |
| 581 | ret = driver_create_file(drv, &driver_attr_unbind); |
| 582 | if (ret == 0) { |
| 583 | ret = driver_create_file(drv, &driver_attr_bind); |
| 584 | if (ret) |
| 585 | driver_remove_file(drv, &driver_attr_unbind); |
| 586 | } |
| 587 | return ret; |
Greg Kroah-Hartman | 874c624 | 2005-12-13 15:17:34 -0800 | [diff] [blame] | 588 | } |
| 589 | |
| 590 | static void remove_bind_files(struct device_driver *drv) |
| 591 | { |
| 592 | driver_remove_file(drv, &driver_attr_bind); |
| 593 | driver_remove_file(drv, &driver_attr_unbind); |
| 594 | } |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 595 | |
Kay Sievers | 8380770 | 2007-07-30 02:28:56 +0200 | [diff] [blame] | 596 | static BUS_ATTR(drivers_probe, S_IWUSR, NULL, store_drivers_probe); |
| 597 | static BUS_ATTR(drivers_autoprobe, S_IWUSR | S_IRUGO, |
| 598 | show_drivers_autoprobe, store_drivers_autoprobe); |
| 599 | |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 600 | static int add_probe_files(struct bus_type *bus) |
| 601 | { |
| 602 | int retval; |
| 603 | |
Kay Sievers | 8380770 | 2007-07-30 02:28:56 +0200 | [diff] [blame] | 604 | retval = bus_create_file(bus, &bus_attr_drivers_probe); |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 605 | if (retval) |
| 606 | goto out; |
| 607 | |
Kay Sievers | 8380770 | 2007-07-30 02:28:56 +0200 | [diff] [blame] | 608 | retval = bus_create_file(bus, &bus_attr_drivers_autoprobe); |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 609 | if (retval) |
Kay Sievers | 8380770 | 2007-07-30 02:28:56 +0200 | [diff] [blame] | 610 | bus_remove_file(bus, &bus_attr_drivers_probe); |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 611 | out: |
| 612 | return retval; |
| 613 | } |
| 614 | |
| 615 | static void remove_probe_files(struct bus_type *bus) |
| 616 | { |
Kay Sievers | 8380770 | 2007-07-30 02:28:56 +0200 | [diff] [blame] | 617 | bus_remove_file(bus, &bus_attr_drivers_autoprobe); |
| 618 | bus_remove_file(bus, &bus_attr_drivers_probe); |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 619 | } |
Greg Kroah-Hartman | 874c624 | 2005-12-13 15:17:34 -0800 | [diff] [blame] | 620 | #else |
Yoichi Yuasa | 35acfdd | 2006-07-15 01:30:11 +0900 | [diff] [blame] | 621 | 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] | 622 | static inline void remove_bind_files(struct device_driver *drv) {} |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 623 | static inline int add_probe_files(struct bus_type *bus) { return 0; } |
| 624 | static inline void remove_probe_files(struct bus_type *bus) {} |
Greg Kroah-Hartman | 874c624 | 2005-12-13 15:17:34 -0800 | [diff] [blame] | 625 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 627 | static ssize_t driver_uevent_store(struct device_driver *drv, |
| 628 | const char *buf, size_t count) |
| 629 | { |
| 630 | enum kobject_action action; |
| 631 | |
| 632 | if (kobject_action_type(buf, count, &action) == 0) |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 633 | kobject_uevent(&drv->p->kobj, action); |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 634 | return count; |
| 635 | } |
| 636 | static DRIVER_ATTR(uevent, S_IWUSR, NULL, driver_uevent_store); |
| 637 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 639 | * bus_add_driver - Add a driver to the bus. |
| 640 | * @drv: driver. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | */ |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 642 | int bus_add_driver(struct device_driver *drv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | { |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 644 | struct bus_type *bus; |
| 645 | struct driver_private *priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | int error = 0; |
| 647 | |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 648 | bus = bus_get(drv->bus); |
Jeff Garzik | d9fd4d3b3 | 2006-10-04 07:48:03 -0400 | [diff] [blame] | 649 | if (!bus) |
Greg Kroah-Hartman | 4f6e194 | 2007-04-20 11:29:52 -0700 | [diff] [blame] | 650 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 652 | 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] | 653 | |
| 654 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
Cornelia Huck | 0763446 | 2008-02-18 17:04:25 +0100 | [diff] [blame] | 655 | if (!priv) { |
| 656 | error = -ENOMEM; |
| 657 | goto out_put_bus; |
| 658 | } |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 659 | klist_init(&priv->klist_devices, NULL, NULL); |
| 660 | priv->driver = drv; |
| 661 | drv->p = priv; |
Greg Kroah-Hartman | c8e90d8 | 2007-12-17 15:54:39 -0400 | [diff] [blame] | 662 | priv->kobj.kset = bus->p->drivers_kset; |
| 663 | error = kobject_init_and_add(&priv->kobj, &driver_ktype, NULL, |
| 664 | "%s", drv->name); |
Cornelia Huck | dc0afa8 | 2007-07-09 11:39:18 -0700 | [diff] [blame] | 665 | if (error) |
Cornelia Huck | 0763446 | 2008-02-18 17:04:25 +0100 | [diff] [blame] | 666 | goto out_unregister; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 668 | if (drv->bus->p->drivers_autoprobe) { |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 669 | error = driver_attach(drv); |
| 670 | if (error) |
| 671 | goto out_unregister; |
| 672 | } |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 673 | klist_add_tail(&priv->knode_bus, &bus->p->klist_drivers); |
Jeff Garzik | d9fd4d3b3 | 2006-10-04 07:48:03 -0400 | [diff] [blame] | 674 | module_add_driver(drv->owner, drv); |
| 675 | |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 676 | error = driver_create_file(drv, &driver_attr_uevent); |
| 677 | if (error) { |
| 678 | printk(KERN_ERR "%s: uevent attr (%s) failed\n", |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 679 | __func__, drv->name); |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 680 | } |
Jeff Garzik | d9fd4d3b3 | 2006-10-04 07:48:03 -0400 | [diff] [blame] | 681 | error = driver_add_attrs(bus, drv); |
| 682 | if (error) { |
| 683 | /* How the hell do we get out of this pickle? Give up */ |
| 684 | printk(KERN_ERR "%s: driver_add_attrs(%s) failed\n", |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 685 | __func__, drv->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | } |
Jeff Garzik | d9fd4d3b3 | 2006-10-04 07:48:03 -0400 | [diff] [blame] | 687 | error = add_bind_files(drv); |
| 688 | if (error) { |
| 689 | /* Ditto */ |
| 690 | printk(KERN_ERR "%s: add_bind_files(%s) failed\n", |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 691 | __func__, drv->name); |
Jeff Garzik | d9fd4d3b3 | 2006-10-04 07:48:03 -0400 | [diff] [blame] | 692 | } |
| 693 | |
Greg Kroah-Hartman | c8e90d8 | 2007-12-17 15:54:39 -0400 | [diff] [blame] | 694 | kobject_uevent(&priv->kobj, KOBJ_ADD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | return error; |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 696 | out_unregister: |
Greg Kroah-Hartman | c10997f | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 697 | kobject_put(&priv->kobj); |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 698 | out_put_bus: |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 699 | bus_put(bus); |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 700 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | } |
| 702 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 704 | * bus_remove_driver - delete driver from bus's knowledge. |
| 705 | * @drv: driver. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 707 | * Detach the driver from the devices it controls, and remove |
| 708 | * it from its bus's list of drivers. Finally, we drop the reference |
| 709 | * to the bus we took in bus_add_driver(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 711 | void bus_remove_driver(struct device_driver *drv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | { |
Jeff Garzik | d9fd4d3b3 | 2006-10-04 07:48:03 -0400 | [diff] [blame] | 713 | if (!drv->bus) |
| 714 | return; |
| 715 | |
| 716 | remove_bind_files(drv); |
| 717 | driver_remove_attrs(drv->bus, drv); |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 718 | driver_remove_file(drv, &driver_attr_uevent); |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 719 | klist_remove(&drv->p->knode_bus); |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 720 | 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] | 721 | driver_detach(drv); |
| 722 | module_remove_driver(drv); |
Greg Kroah-Hartman | c10997f | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 723 | kobject_put(&drv->p->kobj); |
Greg Kroah-Hartman | fc1ede5 | 2007-09-13 02:53:13 -0700 | [diff] [blame] | 724 | bus_put(drv->bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | } |
| 726 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | /* Helper for bus_rescan_devices's iter */ |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 728 | static int __must_check bus_rescan_devices_helper(struct device *dev, |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 729 | void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | { |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 731 | int ret = 0; |
| 732 | |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 733 | if (!dev->driver) { |
| 734 | if (dev->parent) /* Needed for USB */ |
| 735 | down(&dev->parent->sem); |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 736 | ret = device_attach(dev); |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 737 | if (dev->parent) |
| 738 | up(&dev->parent->sem); |
| 739 | } |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 740 | return ret < 0 ? ret : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | } |
| 742 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | /** |
Greg Kroah-Hartman | 23d3d60 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 744 | * bus_rescan_devices - rescan devices on the bus for possible drivers |
| 745 | * @bus: the bus to scan. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | * |
Greg Kroah-Hartman | 23d3d60 | 2005-06-22 16:09:05 -0700 | [diff] [blame] | 747 | * This function will look for devices on the bus with no driver |
| 748 | * attached and rescan it against existing drivers to see if it matches |
| 749 | * any by calling device_attach() for the unbound devices. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 751 | int bus_rescan_devices(struct bus_type *bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | { |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 753 | return bus_for_each_dev(bus, NULL, NULL, bus_rescan_devices_helper); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 755 | EXPORT_SYMBOL_GPL(bus_rescan_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | |
Moore, Eric | e935d5d | 2006-03-14 09:18:18 -0700 | [diff] [blame] | 757 | /** |
| 758 | * device_reprobe - remove driver for a device and probe for a new driver |
| 759 | * @dev: the device to reprobe |
| 760 | * |
| 761 | * This function detaches the attached driver (if any) for the given |
| 762 | * device and restarts the driver probing process. It is intended |
| 763 | * to use if probing criteria changed during a devices lifetime and |
| 764 | * driver attachment should change accordingly. |
| 765 | */ |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 766 | int device_reprobe(struct device *dev) |
Moore, Eric | e935d5d | 2006-03-14 09:18:18 -0700 | [diff] [blame] | 767 | { |
| 768 | if (dev->driver) { |
| 769 | if (dev->parent) /* Needed for USB */ |
| 770 | down(&dev->parent->sem); |
| 771 | device_release_driver(dev); |
| 772 | if (dev->parent) |
| 773 | up(&dev->parent->sem); |
| 774 | } |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 775 | return bus_rescan_devices_helper(dev, NULL); |
Moore, Eric | e935d5d | 2006-03-14 09:18:18 -0700 | [diff] [blame] | 776 | } |
| 777 | EXPORT_SYMBOL_GPL(device_reprobe); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 780 | * find_bus - locate bus by name. |
| 781 | * @name: name of bus. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 783 | * Call kset_find_obj() to iterate over list of buses to |
| 784 | * find a bus by name. Return bus if found. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 786 | * Note that kset_find_obj increments bus' reference count. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | */ |
Adrian Bunk | 7e4ef08 | 2006-06-26 22:26:56 +0200 | [diff] [blame] | 788 | #if 0 |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 789 | struct bus_type *find_bus(char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 791 | struct kobject *k = kset_find_obj(bus_kset, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | return k ? to_bus(k) : NULL; |
| 793 | } |
Adrian Bunk | 7e4ef08 | 2006-06-26 22:26:56 +0200 | [diff] [blame] | 794 | #endif /* 0 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | |
| 796 | |
| 797 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 798 | * bus_add_attrs - Add default attributes for this bus. |
| 799 | * @bus: Bus that has just been registered. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | */ |
| 801 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 802 | static int bus_add_attrs(struct bus_type *bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | { |
| 804 | int error = 0; |
| 805 | int i; |
| 806 | |
| 807 | if (bus->bus_attrs) { |
| 808 | for (i = 0; attr_name(bus->bus_attrs[i]); i++) { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 809 | error = bus_create_file(bus, &bus->bus_attrs[i]); |
Cornelia Huck | dc0afa8 | 2007-07-09 11:39:18 -0700 | [diff] [blame] | 810 | if (error) |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 811 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | } |
| 813 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 814 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | return error; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 816 | err: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | while (--i >= 0) |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 818 | bus_remove_file(bus, &bus->bus_attrs[i]); |
| 819 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | } |
| 821 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 822 | static void bus_remove_attrs(struct bus_type *bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | { |
| 824 | int i; |
| 825 | |
| 826 | if (bus->bus_attrs) { |
| 827 | for (i = 0; attr_name(bus->bus_attrs[i]); i++) |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 828 | bus_remove_file(bus, &bus->bus_attrs[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | } |
| 830 | } |
| 831 | |
James Bottomley | 34bb61f | 2005-09-06 16:56:51 -0700 | [diff] [blame] | 832 | static void klist_devices_get(struct klist_node *n) |
| 833 | { |
Greg Kroah-Hartman | 4db8e28 | 2009-01-09 14:32:46 -0800 | [diff] [blame] | 834 | struct device *dev = container_of(n, struct device, knode_bus); |
James Bottomley | 34bb61f | 2005-09-06 16:56:51 -0700 | [diff] [blame] | 835 | |
| 836 | get_device(dev); |
| 837 | } |
| 838 | |
| 839 | static void klist_devices_put(struct klist_node *n) |
| 840 | { |
Greg Kroah-Hartman | 4db8e28 | 2009-01-09 14:32:46 -0800 | [diff] [blame] | 841 | struct device *dev = container_of(n, struct device, knode_bus); |
James Bottomley | 34bb61f | 2005-09-06 16:56:51 -0700 | [diff] [blame] | 842 | |
| 843 | put_device(dev); |
| 844 | } |
| 845 | |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 846 | static ssize_t bus_uevent_store(struct bus_type *bus, |
| 847 | const char *buf, size_t count) |
| 848 | { |
| 849 | enum kobject_action action; |
| 850 | |
| 851 | if (kobject_action_type(buf, count, &action) == 0) |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 852 | kobject_uevent(&bus->p->subsys.kobj, action); |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 853 | return count; |
| 854 | } |
| 855 | static BUS_ATTR(uevent, S_IWUSR, NULL, bus_uevent_store); |
| 856 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 858 | * bus_register - register a bus with the system. |
| 859 | * @bus: bus. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 861 | * Once we have that, we registered the bus with the kobject |
| 862 | * infrastructure, then register the children subsystems it has: |
| 863 | * the devices and drivers that belong to the bus. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 865 | int bus_register(struct bus_type *bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | { |
| 867 | int retval; |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 868 | struct bus_type_private *priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 870 | priv = kzalloc(sizeof(struct bus_type_private), GFP_KERNEL); |
| 871 | if (!priv) |
| 872 | return -ENOMEM; |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 873 | |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 874 | priv->bus = bus; |
| 875 | bus->p = priv; |
| 876 | |
| 877 | BLOCKING_INIT_NOTIFIER_HEAD(&priv->bus_notifier); |
| 878 | |
| 879 | retval = kobject_set_name(&priv->subsys.kobj, "%s", bus->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | if (retval) |
| 881 | goto out; |
| 882 | |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 883 | priv->subsys.kobj.kset = bus_kset; |
| 884 | priv->subsys.kobj.ktype = &bus_ktype; |
| 885 | priv->drivers_autoprobe = 1; |
Greg Kroah-Hartman | d6b05b8 | 2007-09-12 15:06:57 -0700 | [diff] [blame] | 886 | |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 887 | retval = kset_register(&priv->subsys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | if (retval) |
| 889 | goto out; |
| 890 | |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 891 | retval = bus_create_file(bus, &bus_attr_uevent); |
| 892 | if (retval) |
| 893 | goto bus_uevent_fail; |
| 894 | |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 895 | priv->devices_kset = kset_create_and_add("devices", NULL, |
| 896 | &priv->subsys.kobj); |
| 897 | if (!priv->devices_kset) { |
Greg Kroah-Hartman | 3d89959 | 2007-11-01 13:31:26 -0700 | [diff] [blame] | 898 | retval = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | goto bus_devices_fail; |
Greg Kroah-Hartman | 3d89959 | 2007-11-01 13:31:26 -0700 | [diff] [blame] | 900 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 902 | priv->drivers_kset = kset_create_and_add("drivers", NULL, |
| 903 | &priv->subsys.kobj); |
| 904 | if (!priv->drivers_kset) { |
Greg Kroah-Hartman | 6dcec25 | 2007-11-01 13:31:26 -0700 | [diff] [blame] | 905 | retval = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | goto bus_drivers_fail; |
Greg Kroah-Hartman | 6dcec25 | 2007-11-01 13:31:26 -0700 | [diff] [blame] | 907 | } |
mochel@digitalimplant.org | 465c7a3 | 2005-03-21 11:49:14 -0800 | [diff] [blame] | 908 | |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 909 | klist_init(&priv->klist_devices, klist_devices_get, klist_devices_put); |
| 910 | klist_init(&priv->klist_drivers, NULL, NULL); |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 911 | |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 912 | retval = add_probe_files(bus); |
| 913 | if (retval) |
| 914 | goto bus_probe_files_fail; |
| 915 | |
Cornelia Huck | 1bb6881 | 2006-09-22 11:37:04 +0200 | [diff] [blame] | 916 | retval = bus_add_attrs(bus); |
| 917 | if (retval) |
| 918 | goto bus_attrs_fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 920 | pr_debug("bus: '%s': registered\n", bus->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | return 0; |
| 922 | |
Cornelia Huck | 1bb6881 | 2006-09-22 11:37:04 +0200 | [diff] [blame] | 923 | bus_attrs_fail: |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 924 | remove_probe_files(bus); |
| 925 | bus_probe_files_fail: |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 926 | kset_unregister(bus->p->drivers_kset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | bus_drivers_fail: |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 928 | kset_unregister(bus->p->devices_kset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | bus_devices_fail: |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 930 | bus_remove_file(bus, &bus_attr_uevent); |
| 931 | bus_uevent_fail: |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 932 | kset_unregister(&bus->p->subsys); |
| 933 | kfree(bus->p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | out: |
| 935 | return retval; |
| 936 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 937 | EXPORT_SYMBOL_GPL(bus_register); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 940 | * bus_unregister - remove a bus from the system |
| 941 | * @bus: bus. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 943 | * Unregister the child subsystems and the bus itself. |
| 944 | * Finally, we call bus_put() to release the refcount |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 946 | void bus_unregister(struct bus_type *bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | { |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 948 | pr_debug("bus: '%s': unregistering\n", bus->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | bus_remove_attrs(bus); |
Kay Sievers | b8c5cec | 2007-02-16 17:33:36 +0100 | [diff] [blame] | 950 | remove_probe_files(bus); |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 951 | kset_unregister(bus->p->drivers_kset); |
| 952 | kset_unregister(bus->p->devices_kset); |
Kay Sievers | 7ac1cf4 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 953 | bus_remove_file(bus, &bus_attr_uevent); |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 954 | kset_unregister(&bus->p->subsys); |
| 955 | kfree(bus->p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 957 | EXPORT_SYMBOL_GPL(bus_unregister); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 959 | int bus_register_notifier(struct bus_type *bus, struct notifier_block *nb) |
| 960 | { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 961 | return blocking_notifier_chain_register(&bus->p->bus_notifier, nb); |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 962 | } |
| 963 | EXPORT_SYMBOL_GPL(bus_register_notifier); |
| 964 | |
| 965 | int bus_unregister_notifier(struct bus_type *bus, struct notifier_block *nb) |
| 966 | { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 967 | return blocking_notifier_chain_unregister(&bus->p->bus_notifier, nb); |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 968 | } |
| 969 | EXPORT_SYMBOL_GPL(bus_unregister_notifier); |
| 970 | |
Greg Kroah-Hartman | 0fed80f | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 971 | struct kset *bus_get_kset(struct bus_type *bus) |
| 972 | { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 973 | return &bus->p->subsys; |
Greg Kroah-Hartman | 0fed80f | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 974 | } |
| 975 | EXPORT_SYMBOL_GPL(bus_get_kset); |
| 976 | |
Greg Kroah-Hartman | b249072 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 977 | struct klist *bus_get_device_klist(struct bus_type *bus) |
| 978 | { |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 979 | return &bus->p->klist_devices; |
Greg Kroah-Hartman | b249072 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 980 | } |
| 981 | EXPORT_SYMBOL_GPL(bus_get_device_klist); |
| 982 | |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 983 | /* |
| 984 | * Yes, this forcably breaks the klist abstraction temporarily. It |
| 985 | * just wants to sort the klist, not change reference counts and |
| 986 | * take/drop locks rapidly in the process. It does all this while |
| 987 | * holding the lock for the list, so objects can't otherwise be |
| 988 | * added/removed while we're swizzling. |
| 989 | */ |
| 990 | static void device_insertion_sort_klist(struct device *a, struct list_head *list, |
| 991 | int (*compare)(const struct device *a, |
| 992 | const struct device *b)) |
| 993 | { |
| 994 | struct list_head *pos; |
| 995 | struct klist_node *n; |
| 996 | struct device *b; |
| 997 | |
| 998 | list_for_each(pos, list) { |
| 999 | n = container_of(pos, struct klist_node, n_node); |
Greg Kroah-Hartman | 4db8e28 | 2009-01-09 14:32:46 -0800 | [diff] [blame] | 1000 | b = container_of(n, struct device, knode_bus); |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 1001 | if (compare(a, b) <= 0) { |
Greg Kroah-Hartman | 4db8e28 | 2009-01-09 14:32:46 -0800 | [diff] [blame] | 1002 | list_move_tail(&a->knode_bus.n_node, |
| 1003 | &b->knode_bus.n_node); |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 1004 | return; |
| 1005 | } |
| 1006 | } |
Greg Kroah-Hartman | 4db8e28 | 2009-01-09 14:32:46 -0800 | [diff] [blame] | 1007 | list_move_tail(&a->knode_bus.n_node, list); |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 1008 | } |
| 1009 | |
| 1010 | void bus_sort_breadthfirst(struct bus_type *bus, |
| 1011 | int (*compare)(const struct device *a, |
| 1012 | const struct device *b)) |
| 1013 | { |
| 1014 | LIST_HEAD(sorted_devices); |
| 1015 | struct list_head *pos, *tmp; |
| 1016 | struct klist_node *n; |
| 1017 | struct device *dev; |
| 1018 | struct klist *device_klist; |
| 1019 | |
| 1020 | device_klist = bus_get_device_klist(bus); |
| 1021 | |
| 1022 | spin_lock(&device_klist->k_lock); |
| 1023 | list_for_each_safe(pos, tmp, &device_klist->k_list) { |
| 1024 | n = container_of(pos, struct klist_node, n_node); |
Greg Kroah-Hartman | 4db8e28 | 2009-01-09 14:32:46 -0800 | [diff] [blame] | 1025 | dev = container_of(n, struct device, knode_bus); |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 1026 | device_insertion_sort_klist(dev, &sorted_devices, compare); |
| 1027 | } |
| 1028 | list_splice(&sorted_devices, &device_klist->k_list); |
| 1029 | spin_unlock(&device_klist->k_lock); |
| 1030 | } |
| 1031 | EXPORT_SYMBOL_GPL(bus_sort_breadthfirst); |
| 1032 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | int __init buses_init(void) |
| 1034 | { |
Greg Kroah-Hartman | 59a5483 | 2007-10-29 23:22:26 -0500 | [diff] [blame] | 1035 | bus_kset = kset_create_and_add("bus", &bus_uevent_ops, NULL); |
| 1036 | if (!bus_kset) |
| 1037 | return -ENOMEM; |
| 1038 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | } |