4 #include <linux/init.h>
5 #include <linux/device.h>
6 #include <linux/module.h>
7 #include <linux/export.h>
8 #include <sound/hdaudio.h>
10 MODULE_DESCRIPTION("HD-audio bus");
11 MODULE_LICENSE("GPL");
14 * hdac_get_device_id - gets the hdac device id entry
15 * @hdev: HD-audio core device
16 * @drv: HD-audio codec driver
18 * Compares the hdac device vendor_id and revision_id to the hdac_device
19 * driver id_table and returns the matching device id entry.
21 const struct hda_device_id *
22 hdac_get_device_id(struct hdac_device *hdev, struct hdac_driver *drv)
25 const struct hda_device_id *id = drv->id_table;
27 while (id->vendor_id) {
28 if (hdev->vendor_id == id->vendor_id &&
29 (!id->rev_id || id->rev_id == hdev->revision_id))
37 EXPORT_SYMBOL_GPL(hdac_get_device_id);
39 static int hdac_codec_match(struct hdac_device *dev, struct hdac_driver *drv)
41 if (hdac_get_device_id(dev, drv))
47 static int hda_bus_match(struct device *dev, struct device_driver *drv)
49 struct hdac_device *hdev = dev_to_hdac_dev(dev);
50 struct hdac_driver *hdrv = drv_to_hdac_driver(drv);
52 if (hdev->type != hdrv->type)
56 * if driver provided a match function use that otherwise we will
57 * use hdac_codec_match function
60 return hdrv->match(hdev, hdrv);
62 return hdac_codec_match(hdev, hdrv);
66 struct bus_type snd_hda_bus_type = {
68 .match = hda_bus_match,
70 EXPORT_SYMBOL_GPL(snd_hda_bus_type);
72 static int __init hda_bus_init(void)
74 return bus_register(&snd_hda_bus_type);
77 static void __exit hda_bus_exit(void)
79 bus_unregister(&snd_hda_bus_type);
82 subsys_initcall(hda_bus_init);
83 module_exit(hda_bus_exit);