ALSA: hda - Change BTL amp level on some HP notebooks

Some HP laptops have lower amplifier levels for speakers in comparison
with headphone outputs.  This patch changes the BTL amp level for these
machines to balance both the speaker and headphone output levels.

Signed-off-by: Vitaliy Kulikov <Vitaliy.Kulikov@idt.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_sigmatel.c

@@ -5326,6 +5326,82 @@ again:
 	return 0;
 }
 
+static int stac92hd83xxx_set_system_btl_amp(struct hda_codec *codec)
+{
+	if (codec->vendor_id != 0x111d7605 &&
+	    codec->vendor_id != 0x111d76d1)
+		return 0;
+
+	switch (codec->subsystem_id) {
+	case 0x103c1618:
+	case 0x103c1619:
+	case 0x103c161a:
+	case 0x103c161b:
+	case 0x103c161c:
+	case 0x103c161d:
+	case 0x103c161e:
+	case 0x103c161f:
+	case 0x103c1620:
+	case 0x103c1621:
+	case 0x103c1622:
+	case 0x103c1623:
+
+	case 0x103c162a:
+	case 0x103c162b:
+
+	case 0x103c1630:
+	case 0x103c1631:
+
+	case 0x103c1633:
+
+	case 0x103c1635:
+
+	case 0x103c164f:
+
+	case 0x103c1676:
+	case 0x103c1677:
+	case 0x103c1678:
+	case 0x103c1679:
+	case 0x103c167a:
+	case 0x103c167b:
+	case 0x103c167c:
+	case 0x103c167d:
+	case 0x103c167e:
+	case 0x103c167f:
+	case 0x103c1680:
+	case 0x103c1681:
+	case 0x103c1682:
+	case 0x103c1683:
+	case 0x103c1684:
+	case 0x103c1685:
+	case 0x103c1686:
+	case 0x103c1687:
+	case 0x103c1688:
+	case 0x103c1689:
+	case 0x103c168a:
+	case 0x103c168b:
+	case 0x103c168c:
+	case 0x103c168d:
+	case 0x103c168e:
+	case 0x103c168f:
+	case 0x103c1690:
+	case 0x103c1691:
+	case 0x103c1692:
+
+	case 0x103c3587:
+	case 0x103c3588:
+	case 0x103c3589:
+	case 0x103c358a:
+
+	case 0x103c3667:
+	case 0x103c3668:
+		/* set BTL amp level to 13.43dB for louder speaker output */
+		return snd_hda_codec_write_cache(codec, codec->afg, 0,
+						 0x7F4, 0x14);
+	}
+	return 0;
+}
+
 static int patch_stac92hd83xxx(struct hda_codec *codec)
 {
 	struct sigmatel_spec *spec;
@@ -5452,6 +5528,8 @@ again:
 			AC_VERB_SET_CONNECT_SEL, num_dacs);
 	}
 
+	stac92hd83xxx_set_system_btl_amp(codec);
+
 	codec->proc_widget_hook = stac92hd_proc_hook;
 
 	return 0;