[ALSA] hda-intel - Add hwdep interface

Added a hwdep interface for each codec (enabled per kconfig).
This interface can be used for reading/writing HD-audio verbs
and other purposes as future extensions.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

include/sound/hda_hwdep.h

@@ -0,0 +1,44 @@
+/*
+ * HWDEP Interface for HD-audio codec
+ *
+ * Copyright (c) 2007 Takashi Iwai <tiwai@suse.de>
+ *
+ *  This driver is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This driver is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#ifndef __SOUND_HDA_HWDEP_H
+#define __SOUND_HDA_HWDEP_H
+
+#define HDA_HWDEP_VERSION	((1 << 16) | (0 << 8) | (0 << 0)) /* 1.0.0 */
+
+/* verb */
+#define HDA_REG_NID_SHIFT	24
+#define HDA_REG_VERB_SHIFT	8
+#define HDA_REG_VAL_SHIFT	0
+#define HDA_VERB(nid,verb,param)	((nid)<<24 | (verb)<<8 | (param))
+
+struct hda_verb_ioctl {
+	u32 verb;	/* HDA_VERB() */
+	u32 res;	/* response */
+};
+
+/*
+ * ioctls
+ */
+#define HDA_IOCTL_PVERSION		_IOR('H', 0x10, int)
+#define HDA_IOCTL_VERB_WRITE		_IOWR('H', 0x11, struct hda_verb_ioctl)
+#define HDA_IOCTL_GET_WCAP		_IOWR('H', 0x12, struct hda_verb_ioctl)
+
+#endif