From ec71efc9aaa53b8944b119f8bedd0559c8ed5453 Mon Sep 17 00:00:00 2001 From: Vinod Koul Date: Wed, 3 Jun 2015 12:24:31 +0530 Subject: ALSA: hda - add HDA default codec match function HDA codec drivers can be matched using vendor id and revision id typically. So provide a match function which does this and is loaded when driver hasn't provided one (default behaviour) Signed-off-by: Jeeja KP Signed-off-by: Vinod Koul Signed-off-by: Takashi Iwai --- sound/hda/hda_bus_type.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) (limited to 'sound/hda') diff --git a/sound/hda/hda_bus_type.c b/sound/hda/hda_bus_type.c index 519914a12e8a..89c2711baaaf 100644 --- a/sound/hda/hda_bus_type.c +++ b/sound/hda/hda_bus_type.c @@ -10,6 +10,40 @@ 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); @@ -17,8 +51,15 @@ static int hda_bus_match(struct device *dev, struct device_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; } -- cgit v1.2.3