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FuUdevDevice: add get_siblings_with_subsystem function

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This function returns a list of sibling devices that have a chosen subsystem,
allowing callers to perform a limited walk of the device tree to locate related
devices.
This commit is contained in:
Peter Marheine 2021-04-13 10:21:52 +10:00 committed by Richard Hughes
parent a8167d2389
commit da9a07ba8f
3 changed files with 47 additions and 0 deletions
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44
libfwupdplugin/fu-udev-device.c
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@ -1747,6 +1747,50 @@ fu_udev_device_get_devtype (FuUdevDevice *self)
#endif
}
/**
* fu_udev_device_get_siblings_with_subsystem
* @self: a #FuUdevDevice
* @subsystem: the name of a udev subsystem
*
* Get a list of devices that are siblings of self and have the
* provided subsystem.
*
* Returns (element-type FuUdevDevice) (transfer full): devices
*
* Since: 1.6.0
*/
GPtrArray *
fu_udev_device_get_siblings_with_subsystem (FuUdevDevice *self,
const gchar *const subsystem)
{
g_autoptr(GPtrArray) out = g_ptr_array_new_with_free_func (g_object_unref);
#ifdef HAVE_GUDEV
FuUdevDevicePrivate *priv = GET_PRIVATE (self);
g_autoptr(GUdevDevice) udev_parent = g_udev_device_get_parent (priv->udev_device);
const gchar *udev_parent_path = g_udev_device_get_sysfs_path (udev_parent);
g_autoptr(GUdevClient) udev_client = g_udev_client_new (NULL);
g_autoptr(GList) enumerated = g_udev_client_query_by_subsystem (udev_client, subsystem);
for (GList *element = enumerated; element != NULL; element = element->next) {
g_autoptr(GUdevDevice) enumerated_device = element->data;
g_autoptr(GUdevDevice) enumerated_parent =
g_udev_device_get_parent (enumerated_device);
const gchar *enumerated_parent_path =
g_udev_device_get_sysfs_path (enumerated_parent);
/* if the sysfs path of self's parent is the same as that of the
* located device's parent, they are siblings */
if (g_strcmp0 (udev_parent_path, enumerated_parent_path) == 0) {
g_ptr_array_add (out,
fu_udev_device_new (g_steal_pointer (&enumerated_device)));
}
}
#endif
return g_steal_pointer(&out);
}
static void
fu_udev_device_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec)

2
libfwupdplugin/fu-udev-device.h
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@ -118,3 +118,5 @@ gboolean fu_udev_device_write_sysfs (FuUdevDevice *self,
GError **error)
G_GNUC_WARN_UNUSED_RESULT;
const gchar *fu_udev_device_get_devtype (FuUdevDevice *self);
GPtrArray *fu_udev_device_get_siblings_with_subsystem (FuUdevDevice *self,
const gchar *subsystem);

1
libfwupdplugin/fwupdplugin.map
View File

@ -781,6 +781,7 @@ LIBFWUPDPLUGIN_1.6.0 {
fu_firmware_write_chunk;
fu_ihex_firmware_set_padding_value;
fu_plugin_get_context;
fu_udev_device_get_siblings_with_subsystem;
fu_xmlb_builder_insert_kb;
fu_xmlb_builder_insert_kv;
fu_xmlb_builder_insert_kx;