Commit | Line | Data |
---|---|---|
e3d280fc TI |
1 | /* |
2 | * HD-audio bus | |
3 | */ | |
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> | |
9 | ||
10 | MODULE_DESCRIPTION("HD-audio bus"); | |
11 | MODULE_LICENSE("GPL"); | |
12 | ||
ec71efc9 VK |
13 | /** |
14 | * hdac_get_device_id - gets the hdac device id entry | |
15 | * @hdev: HD-audio core device | |
16 | * @drv: HD-audio codec driver | |
17 | * | |
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. | |
20 | */ | |
21 | const struct hda_device_id * | |
22 | hdac_get_device_id(struct hdac_device *hdev, struct hdac_driver *drv) | |
23 | { | |
24 | if (drv->id_table) { | |
25 | const struct hda_device_id *id = drv->id_table; | |
26 | ||
27 | while (id->vendor_id) { | |
28 | if (hdev->vendor_id == id->vendor_id && | |
29 | (!id->rev_id || id->rev_id == hdev->revision_id)) | |
30 | return id; | |
31 | id++; | |
32 | } | |
33 | } | |
34 | ||
35 | return NULL; | |
36 | } | |
37 | EXPORT_SYMBOL_GPL(hdac_get_device_id); | |
38 | ||
39 | static int hdac_codec_match(struct hdac_device *dev, struct hdac_driver *drv) | |
40 | { | |
41 | if (hdac_get_device_id(dev, drv)) | |
42 | return 1; | |
43 | else | |
44 | return 0; | |
45 | } | |
46 | ||
e3d280fc TI |
47 | static int hda_bus_match(struct device *dev, struct device_driver *drv) |
48 | { | |
49 | struct hdac_device *hdev = dev_to_hdac_dev(dev); | |
50 | struct hdac_driver *hdrv = drv_to_hdac_driver(drv); | |
51 | ||
52 | if (hdev->type != hdrv->type) | |
53 | return 0; | |
ec71efc9 VK |
54 | |
55 | /* | |
56 | * if driver provided a match function use that otherwise we will | |
57 | * use hdac_codec_match function | |
58 | */ | |
e3d280fc TI |
59 | if (hdrv->match) |
60 | return hdrv->match(hdev, hdrv); | |
ec71efc9 VK |
61 | else |
62 | return hdac_codec_match(hdev, hdrv); | |
e3d280fc TI |
63 | return 1; |
64 | } | |
65 | ||
66 | struct bus_type snd_hda_bus_type = { | |
67 | .name = "hdaudio", | |
68 | .match = hda_bus_match, | |
69 | }; | |
70 | EXPORT_SYMBOL_GPL(snd_hda_bus_type); | |
71 | ||
72 | static int __init hda_bus_init(void) | |
73 | { | |
74 | return bus_register(&snd_hda_bus_type); | |
75 | } | |
76 | ||
77 | static void __exit hda_bus_exit(void) | |
78 | { | |
79 | bus_unregister(&snd_hda_bus_type); | |
80 | } | |
81 | ||
82 | subsys_initcall(hda_bus_init); | |
83 | module_exit(hda_bus_exit); |