[ALSA] hda-codec - update sigmatel support and bug fixes

Modules: HDA Codec driver

- Explictly set pin control as input for all input pins
- Fix bug in 922x mixer (no mute on adc0vol)
- Remove broken ch_mode control
- Add support for jack retasking mixer controls to use rear line and
  mic as surround outputs
- Add board tables to support autodetect and pin config defaults for
  systems with broken bioses
- Add support for several Intel mobos
- Add support for DFI mobo with reference boards attached
  (gets rid of compile time switch to use reference boards)
Signed-off-by: NMatt Porter <mporter@embeddedalley.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_sigmatel.c

@@ -4,7 +4,7 @@
  * HD audio interface patch for SigmaTel STAC92xx
  *
  * Copyright (c) 2005 Embedded Alley Solutions, Inc.
- * <matt@embeddedalley.com>
+ * Matt Porter <mporter@embeddedalley.com>
  *
  * Based on patch_cmedia.c and patch_realtek.c
  * Copyright (c) 2004 Takashi Iwai <tiwai@suse.de>
@@ -34,17 +34,22 @@
 #include "hda_codec.h"
 #include "hda_local.h"
 
-#undef STAC_TEST
-
 #define NUM_CONTROL_ALLOC	32
 #define STAC_HP_EVENT		0x37
 #define STAC_UNSOL_ENABLE 	(AC_USRSP_EN | STAC_HP_EVENT)
 
+#define STAC_REF		0
+#define STAC_D945GTP3		1
+#define STAC_D945GTP5		2
+
 struct sigmatel_spec {
 	struct snd_kcontrol_new *mixers[4];
 	unsigned int num_mixers;
 
+	int board_config;
 	unsigned int surr_switch: 1;
+	unsigned int line_switch: 1;
+	unsigned int mic_switch: 1;
 
 	/* playback */
 	struct hda_multi_out multiout;
@@ -57,12 +62,10 @@ struct sigmatel_spec {
 	unsigned int num_muxes;
 	hda_nid_t dig_in_nid;
 
-#ifdef STAC_TEST
 	/* pin widgets */
 	hda_nid_t *pin_nids;
 	unsigned int num_pins;
 	unsigned int *pin_configs;
-#endif
 
 	/* codec specific stuff */
 	struct hda_verb *init;
@@ -72,9 +75,8 @@ struct sigmatel_spec {
 	struct hda_input_mux *input_mux;
 	unsigned int cur_mux[2];
 
-	/* channel mode */
-	unsigned int num_ch_modes;
-	unsigned int cur_ch_mode;
+	/* i/o switches */
+	unsigned int io_switch[2];
 
 	struct hda_pcm pcm_rec[2];	/* PCM information */
 
@@ -105,7 +107,6 @@ static hda_nid_t stac922x_mux_nids[2] = {
         0x12, 0x13,
 };
 
-#ifdef STAC_TEST
 static hda_nid_t stac9200_pin_nids[8] = {
 	0x08, 0x09, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12,
 };
@@ -114,7 +115,6 @@ static hda_nid_t stac922x_pin_nids[10] = {
 	0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
 	0x0f, 0x10, 0x11, 0x15, 0x1b,
 };
-#endif
 
 static int stac92xx_mux_enum_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
 {
@@ -155,49 +155,6 @@ static struct hda_verb stac922x_core_init[] = {
 	{}
 };
 
-static int stac922x_channel_modes[3] = {2, 6, 8};
-
-static int stac922x_ch_mode_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
-{
-	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
-	struct sigmatel_spec *spec = codec->spec;
-
-	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
-	uinfo->count = 1;
-	uinfo->value.enumerated.items = spec->num_ch_modes;
-	if (uinfo->value.enumerated.item >= uinfo->value.enumerated.items)
-		uinfo->value.enumerated.item = uinfo->value.enumerated.items - 1;
-	sprintf(uinfo->value.enumerated.name, "%dch",
-		stac922x_channel_modes[uinfo->value.enumerated.item]);
-	return 0;
-}
-
-static int stac922x_ch_mode_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
-{
-	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
-	struct sigmatel_spec *spec = codec->spec;
-
-	ucontrol->value.enumerated.item[0] = spec->cur_ch_mode;
-	return 0;
-}
-
-static int stac922x_ch_mode_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
-{
-	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
-	struct sigmatel_spec *spec = codec->spec;
-
-	if (ucontrol->value.enumerated.item[0] >= spec->num_ch_modes)
-		ucontrol->value.enumerated.item[0] = spec->num_ch_modes;
-	if (ucontrol->value.enumerated.item[0] == spec->cur_ch_mode &&
-	    ! codec->in_resume)
-		return 0;
-
-	spec->cur_ch_mode = ucontrol->value.enumerated.item[0];
-	spec->multiout.max_channels = stac922x_channel_modes[spec->cur_ch_mode];
-
-	return 1;
-}
-
 static struct snd_kcontrol_new stac9200_mixer[] = {
 	HDA_CODEC_VOLUME("Master Playback Volume", 0xb, 0, HDA_OUTPUT),
 	HDA_CODEC_MUTE("Master Playback Switch", 0xb, 0, HDA_OUTPUT),
@@ -226,22 +183,10 @@ static struct snd_kcontrol_new stac922x_mixer[] = {
 		.put = stac92xx_mux_enum_put,
 	},
 	HDA_CODEC_VOLUME("Capture Volume", 0x17, 0x0, HDA_INPUT),
-	HDA_CODEC_MUTE("Capture Switch", 0x17, 0x0, HDA_INPUT),
 	HDA_CODEC_VOLUME("Mux Capture Volume", 0x12, 0x0, HDA_OUTPUT),
 	{ } /* end */
 };
 
-static struct snd_kcontrol_new stac922x_ch_mode_mixer[] = {
-	{
-		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
-		.name = "Channel Mode",
-		.info = stac922x_ch_mode_info,
-		.get = stac922x_ch_mode_get,
-		.put = stac922x_ch_mode_put,
-	},
-	{ } /* end */
-};
-
 static int stac92xx_build_controls(struct hda_codec *codec)
 {
 	struct sigmatel_spec *spec = codec->spec;
@@ -258,11 +203,6 @@ static int stac92xx_build_controls(struct hda_codec *codec)
 			return err;
 	}
 
-	if (spec->surr_switch) {
-		err = snd_hda_add_new_ctls(codec, stac922x_ch_mode_mixer);
-		if (err < 0)
-			return err;
-	}
 	if (spec->multiout.dig_out_nid) {
 		err = snd_hda_create_spdif_out_ctls(codec, spec->multiout.dig_out_nid);
 		if (err < 0)
@@ -276,18 +216,67 @@ static int stac92xx_build_controls(struct hda_codec *codec)
 	return 0;	
 }
 
-#ifdef STAC_TEST
-static unsigned int stac9200_pin_configs[8] = {
+static unsigned int ref9200_pin_configs[8] = {
 	0x01c47010, 0x01447010, 0x0221401f, 0x01114010,
 	0x02a19020, 0x01a19021, 0x90100140, 0x01813122,
 };
 
-static unsigned int stac922x_pin_configs[10] = {
-	0x01014010, 0x01014011, 0x01014012, 0x0221401f,
-	0x01813122, 0x01014014, 0x01441030, 0x01c41030,
+static unsigned int *stac9200_brd_tbl[] = {
+	ref9200_pin_configs,
+};
+
+static struct hda_board_config stac9200_cfg_tbl[] = {
+	{ .modelname = "ref",
+	  .pci_subvendor = PCI_VENDOR_ID_INTEL,
+	  .pci_subdevice = 0x2668,	/* DFI LanParty */
+	  .config = STAC_REF },
+	{} /* terminator */
+};
+
+static unsigned int ref922x_pin_configs[10] = {
+	0x01014010, 0x01016011, 0x01012012, 0x0221401f,
+	0x01813122, 0x01011014, 0x01441030, 0x01c41030,
 	0x40000100, 0x40000100,
 };
 
+static unsigned int d945gtp3_pin_configs[10] = {
+	0x0221401f, 0x01a19022, 0x01813021, 0x01114010,
+	0x40000100, 0x40000100, 0x40000100, 0x40000100,
+	0x02a19120, 0x40000100,
+};
+
+static unsigned int d945gtp5_pin_configs[10] = {
+	0x0221401f, 0x01111012, 0x01813024, 0x01114010,
+	0x01a19021, 0x01116011, 0x01452130, 0x40000100,
+	0x02a19320, 0x40000100,
+};
+
+static unsigned int *stac922x_brd_tbl[] = {
+	ref922x_pin_configs,
+	d945gtp3_pin_configs,
+	d945gtp5_pin_configs,
+};
+
+static struct hda_board_config stac922x_cfg_tbl[] = {
+	{ .modelname = "ref",
+	  .pci_subvendor = PCI_VENDOR_ID_INTEL,
+	  .pci_subdevice = 0x2668,	/* DFI LanParty */
+	  .config = STAC_REF },		/* SigmaTel reference board */
+	{ .pci_subvendor = PCI_VENDOR_ID_INTEL,
+	  .pci_subdevice = 0x0101,
+	  .config = STAC_D945GTP3 },	/* Intel D945GTP - 3 Stack */
+	{ .pci_subvendor = PCI_VENDOR_ID_INTEL,
+	  .pci_subdevice = 0x0404,
+	  .config = STAC_D945GTP5 },	/* Intel D945GTP - 5 Stack */
+	{ .pci_subvendor = PCI_VENDOR_ID_INTEL,
+	  .pci_subdevice = 0x0303,
+	  .config = STAC_D945GTP5 },	/* Intel D945GNT - 5 Stack */
+	{ .pci_subvendor = PCI_VENDOR_ID_INTEL,
+	  .pci_subdevice = 0x0013,
+	  .config = STAC_D945GTP5 },	/* Intel D955XBK - 5 Stack */
+	{} /* terminator */
+};
+
 static void stac92xx_set_config_regs(struct hda_codec *codec)
 {
 	int i;
@@ -310,10 +299,9 @@ static void stac92xx_set_config_regs(struct hda_codec *codec)
 		pin_cfg = snd_hda_codec_read(codec, spec->pin_nids[i], 0,
 					     AC_VERB_GET_CONFIG_DEFAULT,
 					     0x00);	
-		printk("pin nid %2.2x pin config %8.8x\n", spec->pin_nids[i], pin_cfg);
+		snd_printdd(KERN_INFO "hda_codec: pin nid %2.2x pin config %8.8x\n", spec->pin_nids[i], pin_cfg);
 	}
 }
-#endif
 
 /*
  * Analog playback callbacks
@@ -326,56 +314,6 @@ static int stac92xx_playback_pcm_open(struct hda_pcm_stream *hinfo,
 	return snd_hda_multi_out_analog_open(codec, &spec->multiout, substream);
 }
 
-/*
- * set up the i/o for analog out
- * when the digital out is available, copy the front out to digital out, too.
- */
-static int stac92xx_multi_out_analog_prepare(struct hda_codec *codec, struct hda_multi_out *mout,
-				     unsigned int stream_tag,
-				     unsigned int format,
-				     struct snd_pcm_substream *substream)
-{
-	hda_nid_t *nids = mout->dac_nids;
-	int chs = substream->runtime->channels;
-	int i;
-
-	down(&codec->spdif_mutex);
-	if (mout->dig_out_nid && mout->dig_out_used != HDA_DIG_EXCLUSIVE) {
-		if (chs == 2 &&
-		    snd_hda_is_supported_format(codec, mout->dig_out_nid, format) &&
-		    ! (codec->spdif_status & IEC958_AES0_NONAUDIO)) {
-			mout->dig_out_used = HDA_DIG_ANALOG_DUP;
-			/* setup digital receiver */
-			snd_hda_codec_setup_stream(codec, mout->dig_out_nid,
-						   stream_tag, 0, format);
-		} else {
-			mout->dig_out_used = 0;
-			snd_hda_codec_setup_stream(codec, mout->dig_out_nid, 0, 0, 0);
-		}
-	}
-	up(&codec->spdif_mutex);
-
-	/* front */
-	snd_hda_codec_setup_stream(codec, nids[HDA_FRONT], stream_tag, 0, format);
-	if (mout->hp_nid)
-		/* headphone out will just decode front left/right (stereo) */
-		snd_hda_codec_setup_stream(codec, mout->hp_nid, stream_tag, 0, format);
-	/* surrounds */
-	if (mout->max_channels > 2)
-		for (i = 1; i < mout->num_dacs; i++) {
-			if ((mout->max_channels == 6) && (i == 3))
-				break;
-			if (chs >= (i + 1) * 2) /* independent out */
-				snd_hda_codec_setup_stream(codec, nids[i], stream_tag, i * 2,
-						format);
-			else /* copy front */
-				snd_hda_codec_setup_stream(codec, nids[i], stream_tag, 0,
-						format);
-		}
-	return 0;
-}
-
-
 static int stac92xx_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
 					 struct hda_codec *codec,
 					 unsigned int stream_tag,
@@ -383,8 +321,7 @@ static int stac92xx_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
 					 struct snd_pcm_substream *substream)
 {
 	struct sigmatel_spec *spec = codec->spec;
-	return stac92xx_multi_out_analog_prepare(codec, &spec->multiout, stream_tag,
-						format, substream);
+	return snd_hda_multi_out_analog_prepare(codec, &spec->multiout, stream_tag, format, substream);
 }
 
 static int stac92xx_playback_pcm_cleanup(struct hda_pcm_stream *hinfo,
@@ -511,14 +448,70 @@ static int stac92xx_build_pcms(struct hda_codec *codec)
 	return 0;
 }
 
+static void stac92xx_auto_set_pinctl(struct hda_codec *codec, hda_nid_t nid, int pin_type)
+
+{
+	snd_hda_codec_write(codec, nid, 0, AC_VERB_SET_PIN_WIDGET_CONTROL, pin_type);
+}
+
+static int stac92xx_io_switch_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+	uinfo->count = 1;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = 1;
+	return 0;
+}
+
+static int stac92xx_io_switch_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
+{
+	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
+	struct sigmatel_spec *spec = codec->spec;
+	int io_idx = kcontrol-> private_value & 0xff;
+
+	ucontrol->value.integer.value[0] = spec->io_switch[io_idx];
+	return 0;
+}
+
+static int stac92xx_io_switch_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
+{
+        struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
+	struct sigmatel_spec *spec = codec->spec;
+        hda_nid_t nid = kcontrol->private_value >> 8;
+	int io_idx = kcontrol-> private_value & 0xff;
+        unsigned short val = ucontrol->value.integer.value[0];
+
+	spec->io_switch[io_idx] = val;
+
+	if (val)
+		stac92xx_auto_set_pinctl(codec, nid, AC_PINCTL_OUT_EN);
+	else
+		stac92xx_auto_set_pinctl(codec, nid, AC_PINCTL_IN_EN);
+
+        return 1;
+}
+
+#define STAC_CODEC_IO_SWITCH(xname, xpval) \
+	{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
+	  .name = xname, \
+	  .index = 0, \
+          .info = stac92xx_io_switch_info, \
+          .get = stac92xx_io_switch_get, \
+          .put = stac92xx_io_switch_put, \
+          .private_value = xpval, \
+	}
+
+
 enum {
 	STAC_CTL_WIDGET_VOL,
 	STAC_CTL_WIDGET_MUTE,
+	STAC_CTL_WIDGET_IO_SWITCH,
 };
 
 static struct snd_kcontrol_new stac92xx_control_templates[] = {
 	HDA_CODEC_VOLUME(NULL, 0, 0, 0),
 	HDA_CODEC_MUTE(NULL, 0, 0, 0),
+	STAC_CODEC_IO_SWITCH(NULL, 0),
 };
 
 /* add dynamic controls */
@@ -550,6 +543,51 @@ static int stac92xx_add_control(struct sigmatel_spec *spec, int type, const char
 	return 0;
 }
 
+/* flag inputs as additional dynamic lineouts */
+static int stac92xx_add_dyn_out_pins(struct hda_codec *codec, struct auto_pin_cfg *cfg)
+{
+	struct sigmatel_spec *spec = codec->spec;
+
+	switch (cfg->line_outs) {
+	case 3:
+		/* add line-in as side */
+		if (cfg->input_pins[AUTO_PIN_LINE]) {
+			cfg->line_out_pins[3] = cfg->input_pins[AUTO_PIN_LINE];
+			spec->line_switch = 1;
+			cfg->line_outs++;
+		}
+		break;
+	case 2:
+		/* add line-in as clfe and mic as side */
+		if (cfg->input_pins[AUTO_PIN_LINE]) {
+			cfg->line_out_pins[2] = cfg->input_pins[AUTO_PIN_LINE];
+			spec->line_switch = 1;
+			cfg->line_outs++;
+		}
+		if (cfg->input_pins[AUTO_PIN_MIC]) {
+			cfg->line_out_pins[3] = cfg->input_pins[AUTO_PIN_MIC];
+			spec->mic_switch = 1;
+			cfg->line_outs++;
+		}
+		break;
+	case 1:
+		/* add line-in as surr and mic as clfe */
+		if (cfg->input_pins[AUTO_PIN_LINE]) {
+			cfg->line_out_pins[1] = cfg->input_pins[AUTO_PIN_LINE];
+			spec->line_switch = 1;
+			cfg->line_outs++;
+		}
+		if (cfg->input_pins[AUTO_PIN_MIC]) {
+			cfg->line_out_pins[2] = cfg->input_pins[AUTO_PIN_MIC];
+			spec->mic_switch = 1;
+			cfg->line_outs++;
+		}
+		break;
+	}
+
+	return 0;
+}
+
 /* fill in the dac_nids table from the parsed pin configuration */
 static int stac92xx_auto_fill_dac_nids(struct hda_codec *codec, const struct auto_pin_cfg *cfg)
 {
@@ -578,7 +616,7 @@ static int stac92xx_auto_create_multi_out_ctls(struct sigmatel_spec *spec, const
 	int i, err;
 
 	for (i = 0; i < cfg->line_outs; i++) {
-		if (! spec->multiout.dac_nids[i])
+		if (!spec->multiout.dac_nids[i])
 			continue;
 
 		nid = spec->multiout.dac_nids[i];
@@ -609,6 +647,14 @@ static int stac92xx_auto_create_multi_out_ctls(struct sigmatel_spec *spec, const
 		}
 	}
 
+	if (spec->line_switch)
+		if ((err = stac92xx_add_control(spec, STAC_CTL_WIDGET_IO_SWITCH, "Line In as Output Switch", cfg->input_pins[AUTO_PIN_LINE] << 8)) < 0)
+			return err;
+
+	if (spec->mic_switch)
+		if ((err = stac92xx_add_control(spec, STAC_CTL_WIDGET_IO_SWITCH, "Mic as Output Switch", (cfg->input_pins[AUTO_PIN_MIC] << 8) | 1)) < 0)
+			return err;
+
 	return 0;
 }
 
@@ -666,6 +712,9 @@ static int stac92xx_auto_create_analog_input_ctls(struct hda_codec *codec, const
 	for (i = 0; i < AUTO_PIN_LAST; i++) {
 		int index = -1;
 		if (cfg->input_pins[i]) {
+			/* Enable active pin widget as an input */
+			stac92xx_auto_set_pinctl(codec, cfg->input_pins[i], AC_PINCTL_IN_EN);
+
 			imux->items[imux->num_items].label = labels[i];
 
 			for (j=0; j<spec->num_muxes; j++) {
@@ -686,12 +735,6 @@ static int stac92xx_auto_create_analog_input_ctls(struct hda_codec *codec, const
 	return 0;
 }
 
-static void stac92xx_auto_set_pinctl(struct hda_codec *codec, hda_nid_t nid, int pin_type)
-
-{
-	snd_hda_codec_write(codec, nid, 0, AC_VERB_SET_PIN_WIDGET_CONTROL, pin_type);
-}
-
 static void stac92xx_auto_init_multi_out(struct hda_codec *codec)
 {
 	struct sigmatel_spec *spec = codec->spec;
@@ -720,6 +763,8 @@ static int stac922x_parse_auto_config(struct hda_codec *codec)
 
 	if ((err = snd_hda_parse_pin_def_config(codec, &spec->autocfg)) < 0)
 		return err;
+	if ((err = stac92xx_add_dyn_out_pins(codec, &spec->autocfg)) < 0)
+		return err;
 	if ((err = stac92xx_auto_fill_dac_nids(codec, &spec->autocfg)) < 0)
 		return err;
 	if (! spec->autocfg.line_outs && ! spec->autocfg.hp_pin)
@@ -731,15 +776,8 @@ static int stac922x_parse_auto_config(struct hda_codec *codec)
 		return err;
 
 	spec->multiout.max_channels = spec->multiout.num_dacs * 2;
-	if (spec->multiout.max_channels > 2) {
+	if (spec->multiout.max_channels > 2)
 		spec->surr_switch = 1;
-		spec->cur_ch_mode = 1;
-		spec->num_ch_modes = 2;
-		if (spec->multiout.max_channels == 8) {
-			spec->cur_ch_mode++;
-			spec->num_ch_modes++;
-		}
-	}
 
 	if (spec->autocfg.dig_out_pin) {
 		spec->multiout.dig_out_nid = 0x08;
@@ -901,13 +939,16 @@ static int patch_stac9200(struct hda_codec *codec)
 		return -ENOMEM;
 
 	codec->spec = spec;
+	spec->board_config = snd_hda_check_board_config(codec, stac9200_cfg_tbl);
+	if (spec->board_config < 0)
+                snd_printdd(KERN_INFO "hda_codec: Unknown model for STAC9200, using BIOS defaults\n");
+	else {
+		spec->num_pins = 8;
+		spec->pin_nids = stac9200_pin_nids;
+		spec->pin_configs = stac9200_brd_tbl[spec->board_config];
+		stac92xx_set_config_regs(codec);
+	}
 
-#ifdef STAC_TEST
-	spec->pin_nids = stac9200_pin_nids;
-	spec->num_pins = 8;
-	spec->pin_configs = stac9200_pin_configs;
-	stac92xx_set_config_regs(codec);
-#endif
 	spec->multiout.max_channels = 2;
 	spec->multiout.num_dacs = 1;
 	spec->multiout.dac_nids = stac9200_dac_nids;
@@ -939,13 +980,16 @@ static int patch_stac922x(struct hda_codec *codec)
 		return -ENOMEM;
 
 	codec->spec = spec;
+	spec->board_config = snd_hda_check_board_config(codec, stac922x_cfg_tbl);
+	if (spec->board_config < 0)
+                snd_printdd(KERN_INFO "hda_codec: Unknown model for STAC922x, using BIOS defaults\n");
+	else {
+		spec->num_pins = 10;
+		spec->pin_nids = stac922x_pin_nids;
+		spec->pin_configs = stac922x_brd_tbl[spec->board_config];
+		stac92xx_set_config_regs(codec);
+	}
 
-#ifdef STAC_TEST
-	spec->num_pins = 10;
-	spec->pin_nids = stac922x_pin_nids;
-	spec->pin_configs = stac922x_pin_configs;
-	stac92xx_set_config_regs(codec);
-#endif
 	spec->adc_nids = stac922x_adc_nids;
 	spec->mux_nids = stac922x_mux_nids;
 	spec->num_muxes = 2;