ALSA: hda/realtek: Enable HP amp and mute LED on HP Folio 9480m [v3]

This laptop needs GPIO4 pulled high to enable the headphone amplifier,
and has a mute LED on GPIO3. I modelled the patch on the existing
GPIO4 code which pulls the line low for the same purpose; this time,
the HP amp line is pulled high.

v2: Disable the headphone amplifier when no headphone is connected.
    Don't disable power savings to preserve the LED state.

v3: Remove headset-specific hooks and code; this is just a headphone.
Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_realtek.c

@@ -4441,6 +4441,55 @@ static void alc290_fixup_mono_speakers(struct hda_codec *codec,
 	}
 }
 
+/* Hook to update amp GPIO4 for automute */
+static void alc280_hp_gpio4_automute_hook(struct hda_codec *codec,
+					  struct hda_jack_callback *jack)
+{
+	struct alc_spec *spec = codec->spec;
+
+	snd_hda_gen_hp_automute(codec, jack);
+	/* mute_led_polarity is set to 0, so we pass inverted value here */
+	alc_update_gpio_led(codec, 0x10, !spec->gen.hp_jack_present);
+}
+
+/* Manage GPIOs for HP EliteBook Folio 9480m.
+ *
+ * GPIO4 is the headphone amplifier power control
+ * GPIO3 is the audio output mute indicator LED
+ */
+
+static void alc280_fixup_hp_9480m(struct hda_codec *codec,
+				  const struct hda_fixup *fix,
+				  int action)
+{
+	struct alc_spec *spec = codec->spec;
+	static const struct hda_verb gpio_init[] = {
+		{ 0x01, AC_VERB_SET_GPIO_MASK, 0x18 },
+		{ 0x01, AC_VERB_SET_GPIO_DIRECTION, 0x18 },
+		{}
+	};
+
+	if (action == HDA_FIXUP_ACT_PRE_PROBE) {
+		/* Set the hooks to turn the headphone amp on/off
+		 * as needed
+		 */
+		spec->gen.vmaster_mute.hook = alc_fixup_gpio_mute_hook;
+		spec->gen.hp_automute_hook = alc280_hp_gpio4_automute_hook;
+
+		/* The GPIOs are currently off */
+		spec->gpio_led = 0;
+
+		/* GPIO3 is connected to the output mute LED,
+		 * high is on, low is off
+		 */
+		spec->mute_led_polarity = 0;
+		spec->gpio_mute_led_mask = 0x08;
+
+		/* Initialize GPIO configuration */
+		snd_hda_add_verbs(codec, gpio_init);
+	}
+}
+
 /* for hda_fixup_thinkpad_acpi() */
 #include "thinkpad_helper.c"
 
@@ -4521,6 +4570,7 @@ enum {
 	ALC286_FIXUP_HP_GPIO_LED,
 	ALC280_FIXUP_HP_GPIO2_MIC_HOTKEY,
 	ALC280_FIXUP_HP_DOCK_PINS,
+	ALC280_FIXUP_HP_9480M,
 	ALC288_FIXUP_DELL_HEADSET_MODE,
 	ALC288_FIXUP_DELL1_MIC_NO_PRESENCE,
 	ALC288_FIXUP_DELL_XPS_13_GPIO6,
@@ -5043,6 +5093,10 @@ static const struct hda_fixup alc269_fixups[] = {
 		.chained = true,
 		.chain_id = ALC280_FIXUP_HP_GPIO4
 	},
+	[ALC280_FIXUP_HP_9480M] = {
+		.type = HDA_FIXUP_FUNC,
+		.v.func = alc280_fixup_hp_9480m,
+	},
 	[ALC288_FIXUP_DELL_HEADSET_MODE] = {
 		.type = HDA_FIXUP_FUNC,
 		.v.func = alc_fixup_headset_mode_dell_alc288,
@@ -5161,6 +5215,7 @@ static const struct snd_pci_quirk alc269_fixup_tbl[] = {
 	SND_PCI_QUIRK(0x103c, 0x22b7, "HP", ALC269_FIXUP_HP_MUTE_LED_MIC1),
 	SND_PCI_QUIRK(0x103c, 0x22bf, "HP", ALC269_FIXUP_HP_MUTE_LED_MIC1),
 	SND_PCI_QUIRK(0x103c, 0x22cf, "HP", ALC269_FIXUP_HP_MUTE_LED_MIC1),
+	SND_PCI_QUIRK(0x103c, 0x22db, "HP", ALC280_FIXUP_HP_9480M),
 	SND_PCI_QUIRK(0x103c, 0x22dc, "HP", ALC269_FIXUP_HP_GPIO_MIC1_LED),
 	SND_PCI_QUIRK(0x103c, 0x22fb, "HP", ALC269_FIXUP_HP_GPIO_MIC1_LED),
 	/* ALC290 */