[ALSA] hda-codec - Add EAPD controls for ALC260 test model

This implements a switch control for the EAPD signal output by the ALC26x
chips.  Since some laptops may utilise this to activate useful things it
is handy to have a control for this in the ALC26x test models.  The patch
includes the control in the ALC260 test model.
Signed-off-by: NJonathan Woithe <jwoithe@physics.adelaide.edu.au>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NJaroslav Kysela <perex@perex.cz>

sound/pci/hda/patch_realtek.c

@@ -608,6 +608,59 @@ static int alc_spdif_ctrl_put(struct snd_kcontrol *kcontrol,
 	  .private_value = nid | (mask<<16) }
 #endif   /* CONFIG_SND_DEBUG */
 
+/* A switch control to allow the enabling EAPD digital outputs on the ALC26x.
+ * Again, this is only used in the ALC26x test models to help identify when
+ * the EAPD line must be asserted for features to work.
+ */
+#ifdef CONFIG_SND_DEBUG
+#define alc_eapd_ctrl_info	snd_ctl_boolean_mono_info
+
+static int alc_eapd_ctrl_get(struct snd_kcontrol *kcontrol,
+			      struct snd_ctl_elem_value *ucontrol)
+{
+	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
+	hda_nid_t nid = kcontrol->private_value & 0xffff;
+	unsigned char mask = (kcontrol->private_value >> 16) & 0xff;
+	long *valp = ucontrol->value.integer.value;
+	unsigned int val = snd_hda_codec_read(codec, nid, 0,
+					      AC_VERB_GET_EAPD_BTLENABLE, 0x00);
+
+	*valp = (val & mask) != 0;
+	return 0;
+}
+
+static int alc_eapd_ctrl_put(struct snd_kcontrol *kcontrol,
+			      struct snd_ctl_elem_value *ucontrol)
+{
+	int change;
+	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
+	hda_nid_t nid = kcontrol->private_value & 0xffff;
+	unsigned char mask = (kcontrol->private_value >> 16) & 0xff;
+	long val = *ucontrol->value.integer.value;
+	unsigned int ctrl_data = snd_hda_codec_read(codec, nid, 0,
+						    AC_VERB_GET_EAPD_BTLENABLE,
+						    0x00);
+
+	/* Set/unset the masked control bit(s) as needed */
+	change = (!val ? 0 : mask) != (ctrl_data & mask);
+	if (!val)
+		ctrl_data &= ~mask;
+	else
+		ctrl_data |= mask;
+	snd_hda_codec_write_cache(codec, nid, 0, AC_VERB_SET_EAPD_BTLENABLE,
+				  ctrl_data);
+
+	return change;
+}
+
+#define ALC_EAPD_CTRL_SWITCH(xname, nid, mask) \
+	{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = 0,  \
+	  .info = alc_eapd_ctrl_info, \
+	  .get = alc_eapd_ctrl_get, \
+	  .put = alc_eapd_ctrl_put, \
+	  .private_value = nid | (mask<<16) }
+#endif   /* CONFIG_SND_DEBUG */
+
 /*
  * set up from the preset table
  */
@@ -4332,6 +4385,12 @@ static struct snd_kcontrol_new alc260_test_mixer[] = {
 	ALC_SPDIF_CTRL_SWITCH("SPDIF Playback Switch", 0x03, 0x01),
 	ALC_SPDIF_CTRL_SWITCH("SPDIF Capture Switch", 0x06, 0x01),
 
+	/* A switch allowing EAPD to be enabled.  Some laptops seem to use
+	 * this output to turn on an external amplifier.
+	 */
+	ALC_EAPD_CTRL_SWITCH("LINE-OUT EAPD Enable Switch", 0x0f, 0x02),
+	ALC_EAPD_CTRL_SWITCH("HP-OUT EAPD Enable Switch", 0x10, 0x02),
+
 	{ } /* end */
 };
 static struct hda_verb alc260_test_init_verbs[] = {