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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
commit55944e5e40b1be2afc4855d8d2baf4b73d1876b5 (patch)
tree33f869f55a1b149e9b7c2b7e201867ca5dd52992 /src/libudev/libudev-hwdb.c
parentInitial commit. (diff)
downloadsystemd-55944e5e40b1be2afc4855d8d2baf4b73d1876b5.tar.xz
systemd-55944e5e40b1be2afc4855d8d2baf4b73d1876b5.zip
Adding upstream version 255.4.upstream/255.4
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/libudev/libudev-hwdb.c')
-rw-r--r--src/libudev/libudev-hwdb.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/src/libudev/libudev-hwdb.c b/src/libudev/libudev-hwdb.c
new file mode 100644
index 0000000..8e9ea97
--- /dev/null
+++ b/src/libudev/libudev-hwdb.c
@@ -0,0 +1,123 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+
+#include "sd-hwdb.h"
+
+#include "alloc-util.h"
+#include "hwdb-util.h"
+#include "libudev-list-internal.h"
+
+/**
+ * SECTION:libudev-hwdb
+ * @short_description: retrieve properties from the hardware database
+ *
+ * Libudev hardware database interface.
+ */
+
+/**
+ * udev_hwdb:
+ *
+ * Opaque object representing the hardware database.
+ */
+struct udev_hwdb {
+ unsigned n_ref;
+ sd_hwdb *hwdb;
+ struct udev_list *properties_list;
+};
+
+/**
+ * udev_hwdb_new:
+ * @udev: udev library context (unused)
+ *
+ * Create a hardware database context to query properties for devices.
+ *
+ * Returns: a hwdb context.
+ **/
+_public_ struct udev_hwdb *udev_hwdb_new(struct udev *udev) {
+ _cleanup_(udev_list_freep) struct udev_list *list = NULL;
+ _cleanup_(sd_hwdb_unrefp) sd_hwdb *hwdb_internal = NULL;
+ struct udev_hwdb *hwdb;
+ int r;
+
+ r = sd_hwdb_new(&hwdb_internal);
+ if (r < 0)
+ return_with_errno(NULL, r);
+
+ list = udev_list_new(true);
+ if (!list)
+ return_with_errno(NULL, ENOMEM);
+
+ hwdb = new(struct udev_hwdb, 1);
+ if (!hwdb)
+ return_with_errno(NULL, ENOMEM);
+
+ *hwdb = (struct udev_hwdb) {
+ .n_ref = 1,
+ .hwdb = TAKE_PTR(hwdb_internal),
+ .properties_list = TAKE_PTR(list),
+ };
+
+ return hwdb;
+}
+
+static struct udev_hwdb *udev_hwdb_free(struct udev_hwdb *hwdb) {
+ assert(hwdb);
+
+ sd_hwdb_unref(hwdb->hwdb);
+ udev_list_free(hwdb->properties_list);
+ return mfree(hwdb);
+}
+
+/**
+ * udev_hwdb_ref:
+ * @hwdb: context
+ *
+ * Take a reference of a hwdb context.
+ *
+ * Returns: the passed enumeration context
+ **/
+
+/**
+ * udev_hwdb_unref:
+ * @hwdb: context
+ *
+ * Drop a reference of a hwdb context. If the refcount reaches zero,
+ * all resources of the hwdb context will be released.
+ *
+ * Returns: #NULL
+ **/
+DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(struct udev_hwdb, udev_hwdb, udev_hwdb_free);
+
+/**
+ * udev_hwdb_get_properties_list_entry:
+ * @hwdb: context
+ * @modalias: modalias string
+ * @flags: (unused)
+ *
+ * Lookup a matching device in the hardware database. The lookup key is a
+ * modalias string, whose formats are defined for the Linux kernel modules.
+ * Examples are: pci:v00008086d00001C2D*, usb:v04F2pB221*. The first entry
+ * of a list of retrieved properties is returned.
+ *
+ * Returns: a udev_list_entry.
+ */
+_public_ struct udev_list_entry *udev_hwdb_get_properties_list_entry(struct udev_hwdb *hwdb, const char *modalias, unsigned flags) {
+ const char *key, *value;
+ struct udev_list_entry *e;
+
+ assert_return_errno(hwdb, NULL, EINVAL);
+ assert_return_errno(modalias, NULL, EINVAL);
+
+ udev_list_cleanup(hwdb->properties_list);
+
+ SD_HWDB_FOREACH_PROPERTY(hwdb->hwdb, modalias, key, value)
+ if (!udev_list_entry_add(hwdb->properties_list, key, value))
+ return_with_errno(NULL, ENOMEM);
+
+ e = udev_list_get_entry(hwdb->properties_list);
+ if (!e)
+ return_with_errno(NULL, ENODATA);
+
+ return e;
+}