12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697 |
- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * HD-audio bus
- */
- #include <linux/init.h>
- #include <linux/device.h>
- #include <linux/module.h>
- #include <linux/mod_devicetable.h>
- #include <linux/export.h>
- #include <sound/hdaudio.h>
- MODULE_DESCRIPTION("HD-audio bus");
- MODULE_LICENSE("GPL");
- /**
- * hdac_get_device_id - gets the hdac device id entry
- * @hdev: HD-audio core device
- * @drv: HD-audio codec driver
- *
- * Compares the hdac device vendor_id and revision_id to the hdac_device
- * driver id_table and returns the matching device id entry.
- */
- const struct hda_device_id *
- hdac_get_device_id(struct hdac_device *hdev, struct hdac_driver *drv)
- {
- if (drv->id_table) {
- const struct hda_device_id *id = drv->id_table;
- while (id->vendor_id) {
- if (hdev->vendor_id == id->vendor_id &&
- (!id->rev_id || id->rev_id == hdev->revision_id))
- return id;
- id++;
- }
- }
- return NULL;
- }
- EXPORT_SYMBOL_GPL(hdac_get_device_id);
- static int hdac_codec_match(struct hdac_device *dev, struct hdac_driver *drv)
- {
- if (hdac_get_device_id(dev, drv))
- return 1;
- else
- return 0;
- }
- static int hda_bus_match(struct device *dev, struct device_driver *drv)
- {
- struct hdac_device *hdev = dev_to_hdac_dev(dev);
- struct hdac_driver *hdrv = drv_to_hdac_driver(drv);
- if (hdev->type != hdrv->type)
- return 0;
- /*
- * if driver provided a match function use that otherwise we will
- * use hdac_codec_match function
- */
- if (hdrv->match)
- return hdrv->match(hdev, hdrv);
- else
- return hdac_codec_match(hdev, hdrv);
- return 1;
- }
- static int hda_uevent(struct device *dev, struct kobj_uevent_env *env)
- {
- char modalias[32];
- snd_hdac_codec_modalias(dev_to_hdac_dev(dev), modalias,
- sizeof(modalias));
- if (add_uevent_var(env, "MODALIAS=%s", modalias))
- return -ENOMEM;
- return 0;
- }
- struct bus_type snd_hda_bus_type = {
- .name = "hdaudio",
- .match = hda_bus_match,
- .uevent = hda_uevent,
- };
- EXPORT_SYMBOL_GPL(snd_hda_bus_type);
- static int __init hda_bus_init(void)
- {
- return bus_register(&snd_hda_bus_type);
- }
- static void __exit hda_bus_exit(void)
- {
- bus_unregister(&snd_hda_bus_type);
- }
- subsys_initcall(hda_bus_init);
- module_exit(hda_bus_exit);
|