diff options
Diffstat (limited to 'drivers/base/bus.c')
| -rw-r--r-- | drivers/base/bus.c | 237 |
1 files changed, 108 insertions, 129 deletions
diff --git a/drivers/base/bus.c b/drivers/base/bus.c index 40fb12288ce..83e910a5756 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -17,12 +17,12 @@ #include <linux/init.h> #include <linux/string.h> #include <linux/mutex.h> +#include <linux/sysfs.h> #include "base.h" #include "power/power.h" /* /sys/devices/system */ -/* FIXME: make static after drivers/base/sys.c is deleted */ -struct kset *system_kset; +static struct kset *system_kset; #define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr) @@ -146,8 +146,19 @@ void bus_remove_file(struct bus_type *bus, struct bus_attribute *attr) } EXPORT_SYMBOL_GPL(bus_remove_file); +static void bus_release(struct kobject *kobj) +{ + struct subsys_private *priv = + container_of(kobj, typeof(*priv), subsys.kobj); + struct bus_type *bus = priv->bus; + + kfree(priv); + bus->p = NULL; +} + static struct kobj_type bus_ktype = { .sysfs_ops = &bus_sysfs_ops, + .release = bus_release, }; static int bus_uevent_filter(struct kset *kset, struct kobject *kobj) @@ -165,11 +176,9 @@ static const struct kset_uevent_ops bus_uevent_ops = { static struct kset *bus_kset; - -#ifdef CONFIG_HOTPLUG /* Manually detach a device from its associated driver. */ -static ssize_t driver_unbind(struct device_driver *drv, - const char *buf, size_t count) +static ssize_t unbind_store(struct device_driver *drv, const char *buf, + size_t count) { struct bus_type *bus = bus_get(drv->bus); struct device *dev; @@ -188,15 +197,15 @@ static ssize_t driver_unbind(struct device_driver *drv, bus_put(bus); return err; } -static DRIVER_ATTR(unbind, S_IWUSR, NULL, driver_unbind); +static DRIVER_ATTR_WO(unbind); /* * Manually attach a device to a driver. * Note: the driver must want to bind to the device, * it is not possible to override the driver's id table. */ -static ssize_t driver_bind(struct device_driver *drv, - const char *buf, size_t count) +static ssize_t bind_store(struct device_driver *drv, const char *buf, + size_t count) { struct bus_type *bus = bus_get(drv->bus); struct device *dev; @@ -224,7 +233,7 @@ static ssize_t driver_bind(struct device_driver *drv, bus_put(bus); return err; } -static DRIVER_ATTR(bind, S_IWUSR, NULL, driver_bind); +static DRIVER_ATTR_WO(bind); static ssize_t show_drivers_autoprobe(struct bus_type *bus, char *buf) { @@ -253,7 +262,6 @@ static ssize_t store_drivers_probe(struct bus_type *bus, return -EINVAL; return count; } -#endif static struct device *next_device(struct klist_iter *i) { @@ -294,7 +302,7 @@ int bus_for_each_dev(struct bus_type *bus, struct device *start, struct device *dev; int error = 0; - if (!bus) + if (!bus || !bus->p) return -EINVAL; klist_iter_init_node(&bus->p->klist_devices, &i, @@ -328,7 +336,7 @@ struct device *bus_find_device(struct bus_type *bus, struct klist_iter i; struct device *dev; - if (!bus) + if (!bus || !bus->p) return NULL; klist_iter_init_node(&bus->p->klist_devices, &i, @@ -464,7 +472,7 @@ static int device_add_attrs(struct bus_type *bus, struct device *dev) if (!bus->dev_attrs) return 0; - for (i = 0; attr_name(bus->dev_attrs[i]); i++) { + for (i = 0; bus->dev_attrs[i].attr.name; i++) { error = device_create_file(dev, &bus->dev_attrs[i]); if (error) { while (--i >= 0) @@ -480,7 +488,7 @@ static void device_remove_attrs(struct bus_type *bus, struct device *dev) int i; if (bus->dev_attrs) { - for (i = 0; attr_name(bus->dev_attrs[i]); i++) + for (i = 0; bus->dev_attrs[i].attr.name; i++) device_remove_file(dev, &bus->dev_attrs[i]); } } @@ -503,6 +511,9 @@ int bus_add_device(struct device *dev) error = device_add_attrs(bus, dev); if (error) goto out_put; + error = device_add_groups(dev, bus->dev_groups); + if (error) + goto out_groups; error = sysfs_create_link(&bus->p->devices_kset->kobj, &dev->kobj, dev_name(dev)); if (error) @@ -517,6 +528,8 @@ int bus_add_device(struct device *dev) out_subsys: sysfs_remove_link(&bus->p->devices_kset->kobj, dev_name(dev)); +out_groups: + device_remove_groups(dev, bus->dev_groups); out_id: device_remove_attrs(bus, dev); out_put: @@ -579,6 +592,7 @@ void bus_remove_device(struct device *dev) sysfs_remove_link(&dev->bus->p->devices_kset->kobj, dev_name(dev)); device_remove_attrs(dev->bus, dev); + device_remove_groups(dev, dev->bus->dev_groups); if (klist_node_attached(&dev->p->knode_bus)) klist_del(&dev->p->knode_bus); @@ -588,42 +602,6 @@ void bus_remove_device(struct device *dev) bus_put(dev->bus); } -static int driver_add_attrs(struct bus_type *bus, struct device_driver *drv) -{ - int error = 0; - int i; - - if (bus->drv_attrs) { - for (i = 0; attr_name(bus->drv_attrs[i]); i++) { - error = driver_create_file(drv, &bus->drv_attrs[i]); - if (error) - goto err; - } - } -done: - return error; -err: - while (--i >= 0) - driver_remove_file(drv, &bus->drv_attrs[i]); - goto done; -} - -static void driver_remove_attrs(struct bus_type *bus, - struct device_driver *drv) -{ - int i; - - if (bus->drv_attrs) { - for (i = 0; attr_name(bus->drv_attrs[i]); i++) - driver_remove_file(drv, &bus->drv_attrs[i]); - } -} - -#ifdef CONFIG_HOTPLUG -/* - * Thanks to drivers making their tables __devinit, we can't allow manual - * bind and unbind from userspace unless CONFIG_HOTPLUG is enabled. - */ static int __must_check add_bind_files(struct device_driver *drv) { int ret; @@ -667,15 +645,9 @@ static void remove_probe_files(struct bus_type *bus) bus_remove_file(bus, &bus_attr_drivers_autoprobe); bus_remove_file(bus, &bus_attr_drivers_probe); } -#else -static inline int add_bind_files(struct device_driver *drv) { return 0; } -static inline void remove_bind_files(struct device_driver *drv) {} -static inline int add_probe_files(struct bus_type *bus) { return 0; } -static inline void remove_probe_files(struct bus_type *bus) {} -#endif - -static ssize_t driver_uevent_store(struct device_driver *drv, - const char *buf, size_t count) + +static ssize_t uevent_store(struct device_driver *drv, const char *buf, + size_t count) { enum kobject_action action; @@ -683,7 +655,7 @@ static ssize_t driver_uevent_store(struct device_driver *drv, kobject_uevent(&drv->p->kobj, action); return count; } -static DRIVER_ATTR(uevent, S_IWUSR, NULL, driver_uevent_store); +static DRIVER_ATTR_WO(uevent); /** * bus_add_driver - Add a driver to the bus. @@ -715,12 +687,12 @@ int bus_add_driver(struct device_driver *drv) if (error) goto out_unregister; + klist_add_tail(&priv->knode_bus, &bus->p->klist_drivers); if (drv->bus->p->drivers_autoprobe) { error = driver_attach(drv); if (error) goto out_unregister; } - klist_add_tail(&priv->knode_bus, &bus->p->klist_drivers); module_add_driver(drv->owner, drv); error = driver_create_file(drv, &driver_attr_uevent); @@ -728,10 +700,10 @@ int bus_add_driver(struct device_driver *drv) printk(KERN_ERR "%s: uevent attr (%s) failed\n", __func__, drv->name); } - error = driver_add_attrs(bus, drv); + error = driver_add_groups(drv, bus->drv_groups); if (error) { /* How the hell do we get out of this pickle? Give up */ - printk(KERN_ERR "%s: driver_add_attrs(%s) failed\n", + printk(KERN_ERR "%s: driver_create_groups(%s) failed\n", __func__, drv->name); } @@ -744,7 +716,6 @@ int bus_add_driver(struct device_driver *drv) } } - kobject_uevent(&priv->kobj, KOBJ_ADD); return 0; out_unregister: @@ -771,7 +742,7 @@ void bus_remove_driver(struct device_driver *drv) if (!drv->suppress_bind_attrs) remove_bind_files(drv); - driver_remove_attrs(drv->bus, drv); + driver_remove_groups(drv, drv->bus->drv_groups); driver_remove_file(drv, &driver_attr_uevent); klist_remove(&drv->p->knode_bus); pr_debug("bus: '%s': remove driver %s\n", drv->bus->name, drv->name); @@ -850,40 +821,16 @@ struct bus_type *find_bus(char *name) } #endif /* 0 */ - -/** - * bus_add_attrs - Add default attributes for this bus. - * @bus: Bus that has just been registered. - */ - -static int bus_add_attrs(struct bus_type *bus) +static int bus_add_groups(struct bus_type *bus, + const struct attribute_group **groups) { - int error = 0; - int i; - - if (bus->bus_attrs) { - for (i = 0; attr_name(bus->bus_attrs[i]); i++) { - error = bus_create_file(bus, &bus->bus_attrs[i]); - if (error) - goto err; - } - } -done: - return error; -err: - while (--i >= 0) - bus_remove_file(bus, &bus->bus_attrs[i]); - goto done; + return sysfs_create_groups(&bus->p->subsys.kobj, groups); } -static void bus_remove_attrs(struct bus_type *bus) +static void bus_remove_groups(struct bus_type *bus, + const struct attribute_group **groups) { - int i; - - if (bus->bus_attrs) { - for (i = 0; attr_name(bus->bus_attrs[i]); i++) - bus_remove_file(bus, &bus->bus_attrs[i]); - } + sysfs_remove_groups(&bus->p->subsys.kobj, groups); } static void klist_devices_get(struct klist_node *n) @@ -914,18 +861,18 @@ static ssize_t bus_uevent_store(struct bus_type *bus, static BUS_ATTR(uevent, S_IWUSR, NULL, bus_uevent_store); /** - * __bus_register - register a driver-core subsystem + * bus_register - register a driver-core subsystem * @bus: bus to register - * @key: lockdep class key * * Once we have that, we register the bus with the kobject * infrastructure, then register the children subsystems it has: * the devices and drivers that belong to the subsystem. */ -int __bus_register(struct bus_type *bus, struct lock_class_key *key) +int bus_register(struct bus_type *bus) { int retval; struct subsys_private *priv; + struct lock_class_key *key = &bus->lock_key; priv = kzalloc(sizeof(struct subsys_private), GFP_KERNEL); if (!priv) @@ -975,14 +922,14 @@ int __bus_register(struct bus_type *bus, struct lock_class_key *key) if (retval) goto bus_probe_files_fail; - retval = bus_add_attrs(bus); + retval = bus_add_groups(bus, bus->bus_groups); if (retval) - goto bus_attrs_fail; + goto bus_groups_fail; pr_debug("bus: '%s': registered\n", bus->name); return 0; -bus_attrs_fail: +bus_groups_fail: remove_probe_files(bus); bus_probe_files_fail: kset_unregister(bus->p->drivers_kset); @@ -997,7 +944,7 @@ out: bus->p = NULL; return retval; } -EXPORT_SYMBOL_GPL(__bus_register); +EXPORT_SYMBOL_GPL(bus_register); /** * bus_unregister - remove a bus from the system @@ -1011,14 +958,12 @@ void bus_unregister(struct bus_type *bus) pr_debug("bus: '%s': unregistering\n", bus->name); if (bus->dev_root) device_unregister(bus->dev_root); - bus_remove_attrs(bus); + bus_remove_groups(bus, bus->bus_groups); remove_probe_files(bus); kset_unregister(bus->p->drivers_kset); kset_unregister(bus->p->devices_kset); bus_remove_file(bus, &bus_attr_uevent); kset_unregister(&bus->p->subsys); - kfree(bus->p); - bus->p = NULL; } EXPORT_SYMBOL_GPL(bus_unregister); @@ -1194,13 +1139,15 @@ EXPORT_SYMBOL_GPL(subsys_interface_register); void subsys_interface_unregister(struct subsys_interface *sif) { - struct bus_type *subsys = sif->subsys; + struct bus_type *subsys; struct subsys_dev_iter iter; struct device *dev; - if (!sif) + if (!sif || !sif->subsys) return; + subsys = sif->subsys; + mutex_lock(&subsys->p->mutex); list_del_init(&sif->node); if (sif->remove_dev) { @@ -1219,26 +1166,10 @@ static void system_root_device_release(struct device *dev) { kfree(dev); } -/** - * subsys_system_register - register a subsystem at /sys/devices/system/ - * @subsys: system subsystem - * @groups: default attributes for the root device - * - * All 'system' subsystems have a /sys/devices/system/<name> root device - * with the name of the subsystem. The root device can carry subsystem- - * wide attributes. All registered devices are below this single root - * device and are named after the subsystem with a simple enumeration - * number appended. The registered devices are not explicitely named; - * only 'id' in the device needs to be set. - * - * Do not use this interface for anything new, it exists for compatibility - * with bad ideas only. New subsystems should use plain subsystems; and - * add the subsystem-wide attributes should be added to the subsystem - * directory itself and not some create fake root-device placed in - * /sys/devices/system/<name>. - */ -int subsys_system_register(struct bus_type *subsys, - const struct attribute_group **groups) + +static int subsys_register(struct bus_type *subsys, + const struct attribute_group **groups, + struct kobject *parent_of_root) { struct device *dev; int err; @@ -1257,7 +1188,7 @@ int subsys_system_register(struct bus_type *subsys, if (err < 0) goto err_name; - dev->kobj.parent = &system_kset->kobj; + dev->kobj.parent = parent_of_root; dev->groups = groups; dev->release = system_root_device_release; @@ -1277,8 +1208,56 @@ err_dev: bus_unregister(subsys); return err; } + +/** + * subsys_system_register - register a subsystem at /sys/devices/system/ + * @subsys: system subsystem + * @groups: default attributes for the root device + * + * All 'system' subsystems have a /sys/devices/system/<name> root device + * with the name of the subsystem. The root device can carry subsystem- + * wide attributes. All registered devices are below this single root + * device and are named after the subsystem with a simple enumeration + * number appended. The registered devices are not explicitly named; + * only 'id' in the device needs to be set. + * + * Do not use this interface for anything new, it exists for compatibility + * with bad ideas only. New subsystems should use plain subsystems; and + * add the subsystem-wide attributes should be added to the subsystem + * directory itself and not some create fake root-device placed in + * /sys/devices/system/<name>. + */ +int subsys_system_register(struct bus_type *subsys, + const struct attribute_group **groups) +{ + return subsys_register(subsys, groups, &system_kset->kobj); +} EXPORT_SYMBOL_GPL(subsys_system_register); +/** + * subsys_virtual_register - register a subsystem at /sys/devices/virtual/ + * @subsys: virtual subsystem + * @groups: default attributes for the root device + * + * All 'virtual' subsystems have a /sys/devices/system/<name> root device + * with the name of the subystem. The root device can carry subsystem-wide + * attributes. All registered devices are below this single root device. + * There's no restriction on device naming. This is for kernel software + * constructs which need sysfs interface. + */ +int subsys_virtual_register(struct bus_type *subsys, + const struct attribute_group **groups) +{ + struct kobject *virtual_dir; + + virtual_dir = virtual_device_parent(NULL); + if (!virtual_dir) + return -ENOMEM; + + return subsys_register(subsys, groups, virtual_dir); +} +EXPORT_SYMBOL_GPL(subsys_virtual_register); + int __init buses_init(void) { bus_kset = kset_create_and_add("bus", &bus_uevent_ops, NULL); |