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drivers, staging, unisys Add modalias files to visorbus devices

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This patch adds modalias files that export the device UUID type to sysfs
so that udev can autoload the appropriate device driver on demand.  Note
that is required a minor name change to the channel device sysfs files
which are currently named visorbus_dev_groups, and are now named
visorbus_channel_groups.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Prarit Bhargava 2015-07-24 12:06:53 -04:00 committed by Greg Kroah-Hartman
parent f93b0cbfdf
commit 59fd2c8bd1
1 changed files with 42 additions and 3 deletions
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45
drivers/staging/unisys/visorbus/visorbus_main.c
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@ -69,6 +69,38 @@ static const struct attribute_group *visorbus_bus_groups[] = {
NULL,
};
/*
* DEVICE type attributes
*
* The modalias file will contain the guid of the device.
*/
static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct visor_device *vdev;
uuid_le guid;
vdev = to_visor_device(dev);
guid = visorchannel_get_uuid(vdev->visorchannel);
return snprintf(buf, PAGE_SIZE, "visorbus:%pUl\n", &guid);
}
static DEVICE_ATTR_RO(modalias);
static struct attribute *visorbus_dev_attrs[] = {
&dev_attr_modalias.attr,
NULL,
};
/* sysfs example for bridge-only sysfs files using device_type's */
static const struct attribute_group visorbus_dev_group = {
.attrs = visorbus_dev_attrs,
};
const struct attribute_group *visorbus_dev_groups[] = {
&visorbus_dev_group,
NULL,
};
/** This describes the TYPE of bus.
* (Don't confuse this with an INSTANCE of the bus.)
*/
@ -76,6 +108,7 @@ struct bus_type visorbus_type = {
.name = "visorbus",
.match = visorbus_match,
.uevent = visorbus_uevent,
.dev_groups = visorbus_dev_groups,
.bus_groups = visorbus_bus_groups,
};
@ -128,7 +161,13 @@ static LIST_HEAD(list_all_device_instances);
static int
visorbus_uevent(struct device *xdev, struct kobj_uevent_env *env)
{
if (add_uevent_var(env, "VERSION=%s", VERSION))
struct visor_device *dev;
uuid_le guid;
dev = to_visor_device(xdev);
guid = visorchannel_get_uuid(dev->visorchannel);
if (add_uevent_var(env, "MODALIAS=visorbus:%pUl", &guid))
return -ENOMEM;
return 0;
}
@ -477,7 +516,7 @@ static struct attribute_group channel_attr_grp = {
.attrs = channel_attrs,
};
static const struct attribute_group *visorbus_dev_groups[] = {
static const struct attribute_group *visorbus_channel_groups[] = {
&channel_attr_grp,
NULL
};
@ -936,7 +975,7 @@ create_visor_device(struct visor_device *dev)
sema_init(&dev->visordriver_callback_lock, 1); /* unlocked */
dev->device.bus = &visorbus_type;
dev->device.groups = visorbus_dev_groups;
dev->device.groups = visorbus_channel_groups;
device_initialize(&dev->device);
dev->device.release = visorbus_release_device;
/* keep a reference just for us (now 2) */