projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| e3d280fc TI |
2 | /* |
| 3 | * HD-audio bus | |
| 4 | */ | |
| 5 | #include <linux/init.h> | |
| 6 | #include <linux/device.h> | |
| 7 | #include <linux/module.h> | |
| da23ac1e | 8 | #include <linux/mod_devicetable.h> |
| e3d280fc TI |
9 | #include <linux/export.h> |
| 10 | #include <sound/hdaudio.h> | |
| 11 | ||
| 12 | MODULE_DESCRIPTION("HD-audio bus"); | |
| 13 | MODULE_LICENSE("GPL"); | |
| 14 | ||
| ec71efc9 VK |
15 | /** |
| 16 | * hdac_get_device_id - gets the hdac device id entry | |
| 17 | * @hdev: HD-audio core device | |
| 18 | * @drv: HD-audio codec driver | |
| 19 | * | |
| 20 | * Compares the hdac device vendor_id and revision_id to the hdac_device | |
| 21 | * driver id_table and returns the matching device id entry. | |
| 22 | */ | |
| 23 | const struct hda_device_id * | |
| 24 | hdac_get_device_id(struct hdac_device *hdev, struct hdac_driver *drv) | |
| 25 | { | |
| 26 | if (drv->id_table) { | |
| 27 | const struct hda_device_id *id = drv->id_table; | |
| 28 | ||
| 29 | while (id->vendor_id) { | |
| 30 | if (hdev->vendor_id == id->vendor_id && | |
| 31 | (!id->rev_id || id->rev_id == hdev->revision_id)) | |
| 32 | return id; | |
| 33 | id++; | |
| 34 | } | |
| 35 | } | |
| 36 | ||
| 37 | return NULL; | |
| 38 | } | |
| 39 | EXPORT_SYMBOL_GPL(hdac_get_device_id); | |
| 40 | ||
| 41 | static int hdac_codec_match(struct hdac_device *dev, struct hdac_driver *drv) | |
| 42 | { | |
| 43 | if (hdac_get_device_id(dev, drv)) | |
| 44 | return 1; | |
| 45 | else | |
| 46 | return 0; | |
| 47 | } | |
| 48 | ||
| e3d280fc TI |
49 | static int hda_bus_match(struct device *dev, struct device_driver *drv) |
| 50 | { | |
| 51 | struct hdac_device *hdev = dev_to_hdac_dev(dev); | |
| 52 | struct hdac_driver *hdrv = drv_to_hdac_driver(drv); | |
| 53 | ||
| 54 | if (hdev->type != hdrv->type) | |
| 55 | return 0; | |
| ec71efc9 VK |
56 | |
| 57 | /* | |
| 58 | * if driver provided a match function use that otherwise we will | |
| 59 | * use hdac_codec_match function | |
| 60 | */ | |
| e3d280fc TI |
61 | if (hdrv->match) |
| 62 | return hdrv->match(hdev, hdrv); | |
| ec71efc9 VK |
63 | else |
| 64 | return hdac_codec_match(hdev, hdrv); | |
| e3d280fc TI |
65 | return 1; |
| 66 | } | |
| 67 | ||
| 2a81ada3 | 68 | static int hda_uevent(const struct device *dev, struct kobj_uevent_env *env) |
| 975c947e TR |
69 | { |
| 70 | char modalias[32]; | |
| 71 | ||
| 72 | snd_hdac_codec_modalias(dev_to_hdac_dev(dev), modalias, | |
| 73 | sizeof(modalias)); | |
| 74 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) | |
| 75 | return -ENOMEM; | |
| 76 | return 0; | |
| 77 | } | |
| 78 | ||
| e3d280fc TI |
79 | struct bus_type snd_hda_bus_type = { |
| 80 | .name = "hdaudio", | |
| 81 | .match = hda_bus_match, | |
| 975c947e | 82 | .uevent = hda_uevent, |
| e3d280fc TI |
83 | }; |
| 84 | EXPORT_SYMBOL_GPL(snd_hda_bus_type); | |
| 85 | ||
| 86 | static int __init hda_bus_init(void) | |
| 87 | { | |
| 88 | return bus_register(&snd_hda_bus_type); | |
| 89 | } | |
| 90 | ||
| 91 | static void __exit hda_bus_exit(void) | |
| 92 | { | |
| 93 | bus_unregister(&snd_hda_bus_type); | |
| 94 | } | |
| 95 | ||
| 96 | subsys_initcall(hda_bus_init); | |
| 97 | module_exit(hda_bus_exit); |