[PATCH v4] ALSA: hda/realtek: Add inverted LED quirk for HP ZBook 8 G2a

[Chris Chiu <chris.chiu@canonical.com>]

From: Chris Chiu <chris.chiu@canonical.com>

HP ZBook 8 G2a 14 and 16 (SSIDs 0x103c:0x8f94, 0x103c:0x8f95) use the
Realtek ALC245 codec with a TAS2781 amplifier via I2C. They share the
same hardware configuration as the existing 0x8f40/0x8f41/0x8f42/0x8f62
models but have inverted speaker mute LED polarity, so the existing
ALC245_FIXUP_HP_TAS2781_I2C_MUTE_LED quirk drives the LED backwards:
off when muted and on when unmuted.

Add a dedicated quirk with inverted COEF values. These are speaker-only
models without an HP pin, so the LED is driven directly through the
vmaster_mute hook; there is no need to probe the HP pin at runtime since
the configuration is static and known per SSID.

Signed-off-by: Chris Chiu <chris.chiu@canonical.com>
---
Changes from v3:
- Drop the runtime HP pin detection; the ZBook 8 G2a 14/16 are speaker-only
  models with a static, known configuration, so the LED is driven directly
  via the vmaster_mute hook. This also fixes a latent issue where the hp_pin
  branch fell back to alc245_fixup_hp_mute_led_coefbit() with non-inverted
  polarity, which would have made the quirk a no-op.

Changes from v2:
- Corrected the fixup entry so both 0x8f94 and 0x8f95 use the new inverted
  quirk
- Simplified the commit message

 sound/hda/codecs/realtek/alc269.c | 43 +++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/sound/hda/codecs/realtek/alc269.c b/sound/hda/codecs/realtek/alc269.c
index e809d838ff58..ee8cfacffb31 100644
--- a/sound/hda/codecs/realtek/alc269.c
+++ b/sound/hda/codecs/realtek/alc269.c
@@ -3495,6 +3495,15 @@ static void alc245_hp_spk_mute_led_update(void *private_data, int enabled)
 	alc_update_coef_idx(codec, 0x0b, 0x0c, val);
 }
 
+static void alc245_hp_spk_mute_led_update_inverted(void *private_data, int enabled)
+{
+	struct hda_codec *codec = private_data;
+	unsigned int val;
+
+	val = enabled ? 0x04 : 0x08; /* inverted: 0x04 led off, 0x08 led on */
+	alc_update_coef_idx(codec, 0x0b, 0x0c, val);
+}
+
 /* JD2: mute led GPIO3: micmute led */
 static void alc245_tas2781_i2c_hp_fixup_muteled(struct hda_codec *codec,
 					  const struct hda_fixup *fix, int action)
@@ -3523,6 +3532,33 @@ static void alc245_tas2781_i2c_hp_fixup_muteled(struct hda_codec *codec,
 		alc245_fixup_hp_mute_led_coefbit(codec, fix, action);
 	alc285_fixup_hp_coef_micmute_led(codec, fix, action);
 }
+
+/* Same as alc245_tas2781_i2c_hp_fixup_muteled(), but with inverted speaker
+ * mute LED polarity. The HP ZBook 8 G2a 14/16 (0x103c:0x8f94, 0x103c:0x8f95)
+ * are speaker-only models without an HP pin, so the LED is driven directly
+ * through the vmaster_mute hook.
+ */
+static void alc245_tas2781_i2c_hp_fixup_muteled_inverted(struct hda_codec *codec,
+						const struct hda_fixup *fix, int action)
+{
+	struct alc_spec *spec = codec->spec;
+	static const hda_nid_t conn[] = { 0x02 };
+
+	switch (action) {
+	case HDA_FIXUP_ACT_PRE_PROBE:
+		spec->gen.vmaster_mute.hook = alc245_hp_spk_mute_led_update_inverted;
+		spec->gen.vmaster_mute_led = 1;
+		spec->gen.auto_mute_via_amp = 1;
+		snd_hda_override_conn_list(codec, 0x17, ARRAY_SIZE(conn), conn);
+		break;
+	case HDA_FIXUP_ACT_INIT:
+		alc245_hp_spk_mute_led_update_inverted(codec, !spec->gen.master_mute);
+		break;
+	}
+
+	tas2781_fixup_txnw_i2c(codec, fix, action);
+	alc285_fixup_hp_coef_micmute_led(codec, fix, action);
+}
 /*
  * Clear COEF 0x0d (PCBEEP passthrough) bit 0x40 where BIOS sets it wrongly
  * at PM resume
@@ -3857,6 +3893,7 @@ enum {
 	ALC289_FIXUP_ASUS_ZEPHYRUS_DUAL_SPK,
 	ALC245_FIXUP_HP_TAS2781_SPI_MUTE_LED,
 	ALC245_FIXUP_HP_TAS2781_I2C_MUTE_LED,
+	ALC245_FIXUP_HP_TAS2781_I2C_MUTE_LED_INVERTED,
 	ALC236_FIXUP_HP_MUTE_LED_MICMUTE_GPIO,
 	ALC233_FIXUP_LENOVO_GPIO2_MIC_HOTKEY,
 };
@@ -6327,6 +6364,10 @@ static const struct hda_fixup alc269_fixups[] = {
 		.type = HDA_FIXUP_FUNC,
 		.v.func = alc245_tas2781_i2c_hp_fixup_muteled,
 	},
+	[ALC245_FIXUP_HP_TAS2781_I2C_MUTE_LED_INVERTED] = {
+		.type = HDA_FIXUP_FUNC,
+		.v.func = alc245_tas2781_i2c_hp_fixup_muteled_inverted,
+	},
         [ALC233_FIXUP_LENOVO_GPIO2_MIC_HOTKEY] = {
                 .type = HDA_FIXUP_FUNC,
                 .v.func = alc233_fixup_lenovo_gpio2_mic_hotkey,
@@ -6873,6 +6914,8 @@ static const struct hda_quirk alc269_fixup_tbl[] = {
 	SND_PCI_QUIRK(0x103c, 0x8f41, "HP ZBook 8 G2a 16", ALC245_FIXUP_HP_TAS2781_I2C_MUTE_LED),
 	SND_PCI_QUIRK(0x103c, 0x8f42, "HP ZBook 8 G2a 14W", ALC245_FIXUP_HP_TAS2781_I2C_MUTE_LED),
 	SND_PCI_QUIRK(0x103c, 0x8f62, "HP ZBook 8 G2a 16W", ALC245_FIXUP_HP_TAS2781_I2C_MUTE_LED),
+	SND_PCI_QUIRK(0x103c, 0x8f94, "HP ZBook 8 G2a 14", ALC245_FIXUP_HP_TAS2781_I2C_MUTE_LED_INVERTED),
+	SND_PCI_QUIRK(0x103c, 0x8f95, "HP ZBook 8 G2a 16", ALC245_FIXUP_HP_TAS2781_I2C_MUTE_LED_INVERTED),
 	SND_PCI_QUIRK(0x1043, 0x1032, "ASUS VivoBook X513EA", ALC256_FIXUP_ASUS_MIC_NO_PRESENCE),
 	SND_PCI_QUIRK(0x1043, 0x1034, "ASUS GU605C", ALC285_FIXUP_ASUS_GU605_SPI_SPEAKER2_TO_DAC1),
 	SND_PCI_QUIRK(0x1043, 0x103e, "ASUS X540SA", ALC256_FIXUP_ASUS_MIC),
-- 
2.43.0