4 #include <linux/init.h>
5 #include <linux/device.h>
6 #include <linux/module.h>
7 #include <linux/mod_devicetable.h>
8 #include <linux/export.h>
9 #include <sound/hdaudio.h>
11 MODULE_DESCRIPTION("HD-audio bus");
12 MODULE_LICENSE("GPL");
15 * hdac_get_device_id - gets the hdac device id entry
16 * @hdev: HD-audio core device
17 * @drv: HD-audio codec driver
19 * Compares the hdac device vendor_id and revision_id to the hdac_device
20 * driver id_table and returns the matching device id entry.
22 const struct hda_device_id *
23 hdac_get_device_id(struct hdac_device *hdev, struct hdac_driver *drv)
26 const struct hda_device_id *id = drv->id_table;
28 while (id->vendor_id) {
29 if (hdev->vendor_id == id->vendor_id &&
30 (!id->rev_id || id->rev_id == hdev->revision_id))
38 EXPORT_SYMBOL_GPL(hdac_get_device_id);
40 static int hdac_codec_match(struct hdac_device *dev, struct hdac_driver *drv)
42 if (hdac_get_device_id(dev, drv))
48 static int hda_bus_match(struct device *dev, struct device_driver *drv)
50 struct hdac_device *hdev = dev_to_hdac_dev(dev);
51 struct hdac_driver *hdrv = drv_to_hdac_driver(drv);
53 if (hdev->type != hdrv->type)
57 * if driver provided a match function use that otherwise we will
58 * use hdac_codec_match function
61 return hdrv->match(hdev, hdrv);
63 return hdac_codec_match(hdev, hdrv);
67 static int hda_uevent(struct device *dev, struct kobj_uevent_env *env)
71 snd_hdac_codec_modalias(dev_to_hdac_dev(dev), modalias,
73 if (add_uevent_var(env, "MODALIAS=%s", modalias))
78 struct bus_type snd_hda_bus_type = {
80 .match = hda_bus_match,
83 EXPORT_SYMBOL_GPL(snd_hda_bus_type);
85 static int __init hda_bus_init(void)
87 return bus_register(&snd_hda_bus_type);
90 static void __exit hda_bus_exit(void)
92 bus_unregister(&snd_hda_bus_type);
95 subsys_initcall(hda_bus_init);
96 module_exit(hda_bus_exit);