[PATCH] ALSA: hda/conexant: Add mute LED quirk for HP ZBook 17 G3

[ahmad baghereslami <ahmad.b1995@gmail.com>]

The HP ZBook 17 G3 (PCI SSID 103c:80d6, codec CX20724 with SSID
103c:80f8) has a speaker-mute LED wired to GPIO0 of the codec, the same
as HP's other Conexant laptops of that generation. HP's Windows driver
for this model sets EnableGPIO0MuteSignal. The mic-mute key's LED is not
connected to the codec: toggling each of GPIO0-6, the EAPD of the unused
pins 0x1d and 0x22, and the VREF of pins 0x18 and 0x1d only ever lit the
speaker-mute LED (GPIO0). CXT_FIXUP_MUTE_LED_GPIO would also register a
mic-mute LED on GPIO1, which drives nothing here, so add a fixup that
only sets up the mute LED on GPIO0.

Tested on an HP ZBook 17 G3 with Ubuntu's 7.0.0 kernel and this change
applied to its conexant.c: hda::mute follows the master mute, sound and
the microphone keep working, and the mic-mute key still mutes the mic.

The GPIO and pin tests, reading HP's driver and this patch were done with
the help of an AI coding assistant (Claude); I verified the LED behaviour
on the machine.

Signed-off-by: ahmad baghereslami <ahmad.b1995@gmail.com>
---
 sound/hda/codecs/conexant.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/sound/hda/codecs/conexant.c b/sound/hda/codecs/conexant.c
index a141c94ee..525a6d0d1 100644
--- a/sound/hda/codecs/conexant.c
+++ b/sound/hda/codecs/conexant.c
@@ -305,6 +305,7 @@ enum {
 	CXT_FIXUP_ACER_ASPIRE_GO_MUTE_LED,
 	CXT_FIXUP_HP_ELITEONE_OUT_DIS,
 	CXT_FIXUP_HP_ZBOOK_MUTE_LED,
+	CXT_FIXUP_MUTE_LED_GPIO0,
 	CXT_FIXUP_HEADSET_MIC,
 	CXT_FIXUP_HP_MIC_NO_PRESENCE,
 	CXT_PINCFG_SWS_JS201D,
@@ -810,6 +811,13 @@ static void cxt_fixup_hp_zbook_mute_led(struct hda_codec *codec,
 		cxt_setup_mute_led(codec, 0x10, 0x20);
 }
 
+static void cxt_fixup_mute_led_gpio0(struct hda_codec *codec,
+				     const struct hda_fixup *fix, int action)
+{
+	if (action == HDA_FIXUP_ACT_PRE_PROBE)
+		cxt_setup_mute_led(codec, 0x01, 0);
+}
+
 static void cxt_fixup_acer_aspire_go_mute_led(struct hda_codec *codec,
 					      const struct hda_fixup *fix, int action)
 {
@@ -1089,6 +1097,10 @@ static const struct hda_fixup cxt_fixups[] = {
 		.type = HDA_FIXUP_FUNC,
 		.v.func = cxt_fixup_hp_zbook_mute_led,
 	},
+	[CXT_FIXUP_MUTE_LED_GPIO0] = {
+		.type = HDA_FIXUP_FUNC,
+		.v.func = cxt_fixup_mute_led_gpio0,
+	},
 	[CXT_FIXUP_HEADSET_MIC] = {
 		.type = HDA_FIXUP_FUNC,
 		.v.func = cxt_fixup_headset_mic,
@@ -1193,6 +1205,7 @@ static const struct hda_quirk cxt5066_fixups[] = {
 	SND_PCI_QUIRK(0x1025, 0x1937, "Acer Aspire Go 16", CXT_FIXUP_ACER_ASPIRE_GO_MUTE_LED),
 	SND_PCI_QUIRK(0x103c, 0x8079, "HP EliteBook 840 G3", CXT_FIXUP_HP_DOCK),
 	SND_PCI_QUIRK(0x103c, 0x807C, "HP EliteBook 820 G3", CXT_FIXUP_HP_DOCK),
+	SND_PCI_QUIRK(0x103c, 0x80d6, "HP ZBook 17 G3", CXT_FIXUP_MUTE_LED_GPIO0),
 	SND_PCI_QUIRK(0x103c, 0x80FD, "HP ProBook 640 G2", CXT_FIXUP_HP_DOCK),
 	SND_PCI_QUIRK(0x103c, 0x8115, "HP Z1 Gen3", CXT_FIXUP_HP_GATE_MIC),
 	SND_PCI_QUIRK(0x103c, 0x814f, "HP ZBook 15u G3", CXT_FIXUP_MUTE_LED_GPIO),
-- 
2.53.0