[media] Add proper audio support for Nova-S Plus with wm8775 ADC

This patch adds audio DMA capture and ALSA mixer elements for the line
input jack of the Hauppauge Nova-S-plus DVB-S PCI card.  The Nova-S-plus
has a WM8775 ADC that is currently not detected.  This patch enables
this chip and exports volume, balance mute and ALC elements for ALSA
mixer controls.

[mchehab@redhat.com: Changed the patch to only talk with wm8775 if board
info says so. Also, added platform_data support, to avoid changing the
behaviour for other boards, and fixed CodingStyle]

[awalls@md.metrocast.net: Changed patch to make the WM8775_GID defintion
bridge driver private and let the bridge driver set the value of
v4l2_subdev.grp_id.]

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Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Andy Walls <awalls@md.metrocast.net>

drivers/media/video/cx88/cx88-alsa.c

@@ -40,6 +40,7 @@
 #include <sound/control.h>
 #include <sound/initval.h>
 #include <sound/tlv.h>
+#include <media/wm8775.h>
 
 #include "cx88.h"
 #include "cx88-reg.h"
@@ -577,6 +578,35 @@ static int snd_cx88_volume_get(struct snd_kcontrol *kcontrol,
 	return 0;
 }
 
+static void snd_cx88_wm8775_volume_put(struct snd_kcontrol *kcontrol,
+			       struct snd_ctl_elem_value *value)
+{
+	snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
+	struct cx88_core *core = chip->core;
+	struct v4l2_control client_ctl;
+	int left = value->value.integer.value[0];
+	int right = value->value.integer.value[1];
+	int v, b;
+
+	memset(&client_ctl, 0, sizeof(client_ctl));
+
+	/* Pass volume & balance onto any WM8775 */
+	if (left >= right) {
+		v = left << 10;
+		b = left ? (0x8000 * right) / left : 0x8000;
+	} else {
+		v = right << 10;
+		b = right ? 0xffff - (0x8000 * left) / right : 0x8000;
+	}
+	client_ctl.value = v;
+	client_ctl.id = V4L2_CID_AUDIO_VOLUME;
+	call_hw(core, WM8775_GID, core, s_ctrl, &client_ctl);
+
+	client_ctl.value = b;
+	client_ctl.id = V4L2_CID_AUDIO_BALANCE;
+	call_hw(core, WM8775_GID, core, s_ctrl, &client_ctl);
+}
+
 /* OK - TODO: test it */
 static int snd_cx88_volume_put(struct snd_kcontrol *kcontrol,
 			       struct snd_ctl_elem_value *value)
@@ -587,6 +617,9 @@ static int snd_cx88_volume_put(struct snd_kcontrol *kcontrol,
 	int changed = 0;
 	u32 old;
 
+	if (core->board.audio_chip == V4L2_IDENT_WM8775)
+		snd_cx88_wm8775_volume_put(kcontrol, value);
+
 	left = value->value.integer.value[0] & 0x3f;
 	right = value->value.integer.value[1] & 0x3f;
 	b = right - left;
@@ -600,10 +633,10 @@ static int snd_cx88_volume_put(struct snd_kcontrol *kcontrol,
 	spin_lock_irq(&chip->reg_lock);
 	old = cx_read(AUD_VOL_CTL);
 	if (v != (old & 0x3f)) {
-	    cx_write(AUD_VOL_CTL, (old & ~0x3f) | v);
+		cx_swrite(SHADOW_AUD_VOL_CTL, AUD_VOL_CTL, (old & ~0x3f) | v);
 		changed = 1;
 	}
-	if (cx_read(AUD_BAL_CTL) != b) {
+	if ((cx_read(AUD_BAL_CTL) & 0x7f) != b) {
 		cx_write(AUD_BAL_CTL, b);
 		changed = 1;
 	}
@@ -618,7 +651,7 @@ static const struct snd_kcontrol_new snd_cx88_volume = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
 		  SNDRV_CTL_ELEM_ACCESS_TLV_READ,
-	.name = "Playback Volume",
+	.name = "Analog-TV Volume",
 	.info = snd_cx88_volume_info,
 	.get = snd_cx88_volume_get,
 	.put = snd_cx88_volume_put,
@@ -649,7 +682,17 @@ static int snd_cx88_switch_put(struct snd_kcontrol *kcontrol,
 	vol = cx_read(AUD_VOL_CTL);
 	if (value->value.integer.value[0] != !(vol & bit)) {
 		vol ^= bit;
-		cx_write(AUD_VOL_CTL, vol);
+		cx_swrite(SHADOW_AUD_VOL_CTL, AUD_VOL_CTL, vol);
+		/* Pass mute onto any WM8775 */
+		if ((core->board.audio_chip == V4L2_IDENT_WM8775) &&
+		    ((1<<6) == bit)) {
+			struct v4l2_control client_ctl;
+
+			memset(&client_ctl, 0, sizeof(client_ctl));
+			client_ctl.value = 0 != (vol & bit);
+			client_ctl.id = V4L2_CID_AUDIO_MUTE;
+			call_hw(core, WM8775_GID, core, s_ctrl, &client_ctl);
+		}
 		ret = 1;
 	}
 	spin_unlock_irq(&chip->reg_lock);
@@ -658,7 +701,7 @@ static int snd_cx88_switch_put(struct snd_kcontrol *kcontrol,
 
 static const struct snd_kcontrol_new snd_cx88_dac_switch = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
-	.name = "Playback Switch",
+	.name = "Audio-Out Switch",
 	.info = snd_ctl_boolean_mono_info,
 	.get = snd_cx88_switch_get,
 	.put = snd_cx88_switch_put,
@@ -667,13 +710,51 @@ static const struct snd_kcontrol_new snd_cx88_dac_switch = {
 
 static const struct snd_kcontrol_new snd_cx88_source_switch = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
-	.name = "Capture Switch",
+	.name = "Analog-TV Switch",
 	.info = snd_ctl_boolean_mono_info,
 	.get = snd_cx88_switch_get,
 	.put = snd_cx88_switch_put,
 	.private_value = (1<<6),
 };
 
+static int snd_cx88_alc_get(struct snd_kcontrol *kcontrol,
+			       struct snd_ctl_elem_value *value)
+{
+	snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
+	struct cx88_core *core = chip->core;
+	struct v4l2_control client_ctl;
+
+	memset(&client_ctl, 0, sizeof(client_ctl));
+	client_ctl.id = V4L2_CID_AUDIO_LOUDNESS;
+	call_hw(core, WM8775_GID, core, g_ctrl, &client_ctl);
+	value->value.integer.value[0] = client_ctl.value ? 1 : 0;
+
+	return 0;
+}
+
+static int snd_cx88_alc_put(struct snd_kcontrol *kcontrol,
+				       struct snd_ctl_elem_value *value)
+{
+	snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
+	struct cx88_core *core = chip->core;
+	struct v4l2_control client_ctl;
+
+	memset(&client_ctl, 0, sizeof(client_ctl));
+	client_ctl.value = 0 != value->value.integer.value[0];
+	client_ctl.id = V4L2_CID_AUDIO_LOUDNESS;
+	call_hw(core, WM8775_GID, core, s_ctrl, &client_ctl);
+
+	return 0;
+}
+
+static struct snd_kcontrol_new snd_cx88_alc_switch = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Line-In ALC Switch",
+	.info = snd_ctl_boolean_mono_info,
+	.get = snd_cx88_alc_get,
+	.put = snd_cx88_alc_put,
+};
+
 /****************************************************************************
 			Basic Flow for Sound Devices
  ****************************************************************************/
@@ -724,7 +805,8 @@ static void snd_cx88_dev_free(struct snd_card * card)
 static int devno;
 static int __devinit snd_cx88_create(struct snd_card *card,
 				     struct pci_dev *pci,
-				     snd_cx88_card_t **rchip)
+				     snd_cx88_card_t **rchip,
+				     struct cx88_core **core_ptr)
 {
 	snd_cx88_card_t   *chip;
 	struct cx88_core  *core;
@@ -750,7 +832,7 @@ static int __devinit snd_cx88_create(struct snd_card *card,
 	if (!pci_dma_supported(pci,DMA_BIT_MASK(32))) {
 		dprintk(0, "%s/1: Oops: no 32bit PCI DMA ???\n",core->name);
 		err = -EIO;
-		cx88_core_put(core,pci);
+		cx88_core_put(core, pci);
 		return err;
 	}
 
@@ -786,6 +868,7 @@ static int __devinit snd_cx88_create(struct snd_card *card,
 	snd_card_set_dev(card, &pci->dev);
 
 	*rchip = chip;
+	*core_ptr = core;
 
 	return 0;
 }
@@ -795,6 +878,7 @@ static int __devinit cx88_audio_initdev(struct pci_dev *pci,
 {
 	struct snd_card  *card;
 	snd_cx88_card_t  *chip;
+	struct cx88_core *core;
 	int              err;
 
 	if (devno >= SNDRV_CARDS)
@@ -812,7 +896,7 @@ static int __devinit cx88_audio_initdev(struct pci_dev *pci,
 
 	card->private_free = snd_cx88_dev_free;
 
-	err = snd_cx88_create(card, pci, &chip);
+	err = snd_cx88_create(card, pci, &chip, &core);
 	if (err < 0)
 		goto error;
 
@@ -830,6 +914,10 @@ static int __devinit cx88_audio_initdev(struct pci_dev *pci,
 	if (err < 0)
 		goto error;
 
+	/* If there's a wm8775 then add a Line-In ALC switch */
+	if (core->board.audio_chip == V4L2_IDENT_WM8775)
+		snd_ctl_add(card, snd_ctl_new1(&snd_cx88_alc_switch, chip));
+
 	strcpy (card->driver, "CX88x");
 	sprintf(card->shortname, "Conexant CX%x", pci->device);
 	sprintf(card->longname, "%s at %#llx",

drivers/media/video/cx88/cx88-cards.c

@@ -971,6 +971,7 @@ static const struct cx88_board cx88_boards[] = {
 		.tuner_addr	= ADDR_UNSET,
 		.radio_addr	= ADDR_UNSET,
 		.audio_chip	= V4L2_IDENT_WM8775,
+		.i2sinputcntl   = 2,
 		.input		= {{
 			.type	= CX88_VMUX_DVB,
 			.vmux	= 0,

drivers/media/video/cx88/cx88-tvaudio.c

@@ -786,8 +786,12 @@ void cx88_set_tvaudio(struct cx88_core *core)
 		break;
 	case WW_I2SADC:
 		set_audio_start(core, 0x01);
-		/* Slave/Philips/Autobaud */
+		/*
-		cx_write(AUD_I2SINPUTCNTL, 0);
+		 * Slave/Philips/Autobaud
+		 * NB on Nova-S bit1 NPhilipsSony appears to be inverted:
+		 *	0= Sony, 1=Philips
+		 */
+		cx_write(AUD_I2SINPUTCNTL, core->board.i2sinputcntl);
 		/* Switch to "I2S ADC mode" */
 		cx_write(AUD_I2SCNTL, 0x1);
 		set_audio_finish(core, EN_I2SIN_ENABLE);

drivers/media/video/cx88/cx88-video.c

@@ -40,6 +40,7 @@
 #include "cx88.h"
 #include <media/v4l2-common.h>
 #include <media/v4l2-ioctl.h>
+#include <media/wm8775.h>
 
 MODULE_DESCRIPTION("v4l2 driver module for cx2388x based TV cards");
 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
@@ -989,6 +990,32 @@ int cx88_set_control(struct cx88_core *core, struct v4l2_control *ctl)
 		ctl->value = c->v.minimum;
 	if (ctl->value > c->v.maximum)
 		ctl->value = c->v.maximum;
+
+	/* Pass changes onto any WM8775 */
+	if (core->board.audio_chip == V4L2_IDENT_WM8775) {
+		struct v4l2_control client_ctl;
+		memset(&client_ctl, 0, sizeof(client_ctl));
+		client_ctl.id = ctl->id;
+
+		switch (ctl->id) {
+		case V4L2_CID_AUDIO_MUTE:
+			client_ctl.value = ctl->value;
+			break;
+		case V4L2_CID_AUDIO_VOLUME:
+			client_ctl.value = (ctl->value) ?
+				(0x90 + ctl->value) << 8 : 0;
+			break;
+		case V4L2_CID_AUDIO_BALANCE:
+			client_ctl.value = ctl->value << 9;
+			break;
+		default:
+			client_ctl.id = 0;
+			break;
+		}
+		if (client_ctl.id)
+			call_hw(core, WM8775_GID, core, s_ctrl, &client_ctl);
+	}
+
 	mask=c->mask;
 	switch (ctl->id) {
 	case V4L2_CID_AUDIO_BALANCE:
@@ -1526,7 +1553,9 @@ static int radio_queryctrl (struct file *file, void *priv,
 	if (c->id <  V4L2_CID_BASE ||
 		c->id >= V4L2_CID_LASTP1)
 		return -EINVAL;
-	if (c->id == V4L2_CID_AUDIO_MUTE) {
+	if (c->id == V4L2_CID_AUDIO_MUTE ||
+		c->id == V4L2_CID_AUDIO_VOLUME ||
+		c->id == V4L2_CID_AUDIO_BALANCE) {
 		for (i = 0; i < CX8800_CTLS; i++) {
 			if (cx8800_ctls[i].v.id == c->id)
 				break;
@@ -1856,9 +1885,24 @@ static int __devinit cx8800_initdev(struct pci_dev *pci_dev,
 
 	/* load and configure helper modules */
 
-	if (core->board.audio_chip == V4L2_IDENT_WM8775)
+	if (core->board.audio_chip == V4L2_IDENT_WM8775) {
-		v4l2_i2c_new_subdev(&core->v4l2_dev, &core->i2c_adap,
+		struct i2c_board_info wm8775_info = {
-				"wm8775", 0x36 >> 1, NULL);
+			.type = "wm8775",
+			.addr = 0x36 >> 1,
+			.platform_data = &core->wm8775_data,
+		};
+		struct v4l2_subdev *sd;
+
+		if (core->boardnr == CX88_BOARD_HAUPPAUGE_NOVASPLUS_S1)
+			core->wm8775_data.is_nova_s = true;
+		else
+			core->wm8775_data.is_nova_s = false;
+
+		sd = v4l2_i2c_new_subdev_board(&core->v4l2_dev, &core->i2c_adap,
+				&wm8775_info, NULL);
+		if (sd != NULL)
+			sd->grp_id = WM8775_GID;
+	}
 
 	if (core->board.audio_chip == V4L2_IDENT_TVAUDIO) {
 		/* This probes for a tda9874 as is used on some

drivers/media/video/cx88/cx88.h

@@ -33,6 +33,7 @@
 #include <media/cx2341x.h>
 #include <media/videobuf-dvb.h>
 #include <media/ir-kbd-i2c.h>
+#include <media/wm8775.h>
 
 #include "btcx-risc.h"
 #include "cx88-reg.h"
@@ -273,6 +274,9 @@ struct cx88_board {
 	enum cx88_board_type    mpeg;
 	unsigned int            audio_chip;
 	int			num_frontends;
+
+	/* Used for I2S devices */
+	int			i2sinputcntl;
 };
 
 struct cx88_subid {
@@ -379,6 +383,7 @@ struct cx88_core {
 
 	/* I2C remote data */
 	struct IR_i2c_init_data    init_data;
+	struct wm8775_platform_data wm8775_data;
 
 	struct mutex               lock;
 	/* various v4l controls */
@@ -398,17 +403,21 @@ static inline struct cx88_core *to_core(struct v4l2_device *v4l2_dev)
 	return container_of(v4l2_dev, struct cx88_core, v4l2_dev);
 }
 
-#define call_all(core, o, f, args...) 				\
+#define WM8775_GID	(1 << 0)
+
+#define call_hw(core, grpid, o, f, args...) \
 	do {							\
 		if (!core->i2c_rc) {				\
 			if (core->gate_ctrl)			\
 				core->gate_ctrl(core, 1);	\
-			v4l2_device_call_all(&core->v4l2_dev, 0, o, f, ##args); \
+			v4l2_device_call_all(&core->v4l2_dev, grpid, o, f, ##args); \
 			if (core->gate_ctrl)			\
 				core->gate_ctrl(core, 0);	\
 		}						\
 	} while (0)
 
+#define call_all(core, o, f, args...) call_hw(core, 0, o, f, ##args)
+
 struct cx8800_dev;
 struct cx8802_dev;
 

drivers/media/video/wm8775.c

@@ -35,6 +35,7 @@
 #include <media/v4l2-device.h>
 #include <media/v4l2-chip-ident.h>
 #include <media/v4l2-ctrls.h>
+#include <media/wm8775.h>
 
 MODULE_DESCRIPTION("wm8775 driver");
 MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
@@ -50,10 +51,16 @@ enum {
 	TOT_REGS
 };
 
+#define ALC_HOLD 0x85 /* R17: use zero cross detection, ALC hold time 42.6 ms */
+#define ALC_EN 0x100  /* R17: ALC enable */
+
 struct wm8775_state {
 	struct v4l2_subdev sd;
 	struct v4l2_ctrl_handler hdl;
 	struct v4l2_ctrl *mute;
+	struct v4l2_ctrl *vol;
+	struct v4l2_ctrl *bal;
+	struct v4l2_ctrl *loud;
 	u8 input;		/* Last selected input (0-0xf) */
 };
 
@@ -85,6 +92,30 @@ static int wm8775_write(struct v4l2_subdev *sd, int reg, u16 val)
 	return -1;
 }
 
+static void wm8775_set_audio(struct v4l2_subdev *sd, int quietly)
+{
+	struct wm8775_state *state = to_state(sd);
+	u8 vol_l, vol_r;
+	int muted = 0 != state->mute->val;
+	u16 volume = (u16)state->vol->val;
+	u16 balance = (u16)state->bal->val;
+
+	/* normalize ( 65535 to 0 -> 255 to 0 (+24dB to -103dB) ) */
+	vol_l = (min(65536 - balance, 32768) * volume) >> 23;
+	vol_r = (min(balance, (u16)32768) * volume) >> 23;
+
+	/* Mute */
+	if (muted || quietly)
+		wm8775_write(sd, R21, 0x0c0 | state->input);
+
+	wm8775_write(sd, R14, vol_l | 0x100); /* 0x100= Left channel ADC zero cross enable */
+	wm8775_write(sd, R15, vol_r | 0x100); /* 0x100= Right channel ADC zero cross enable */
+
+	/* Un-mute */
+	if (!muted)
+		wm8775_write(sd, R21, state->input);
+}
+
 static int wm8775_s_routing(struct v4l2_subdev *sd,
 			    u32 input, u32 output, u32 config)
 {
@@ -102,25 +133,26 @@ static int wm8775_s_routing(struct v4l2_subdev *sd,
 	state->input = input;
 	if (!v4l2_ctrl_g_ctrl(state->mute))
 		return 0;
-	wm8775_write(sd, R21, 0x0c0);
+	if (!v4l2_ctrl_g_ctrl(state->vol))
-	wm8775_write(sd, R14, 0x1d4);
+		return 0;
-	wm8775_write(sd, R15, 0x1d4);
+	if (!v4l2_ctrl_g_ctrl(state->bal))
-	wm8775_write(sd, R21, 0x100 + state->input);
+		return 0;
+	wm8775_set_audio(sd, 1);
 	return 0;
 }
 
 static int wm8775_s_ctrl(struct v4l2_ctrl *ctrl)
 {
 	struct v4l2_subdev *sd = to_sd(ctrl);
-	struct wm8775_state *state = to_state(sd);
 
 	switch (ctrl->id) {
 	case V4L2_CID_AUDIO_MUTE:
-		wm8775_write(sd, R21, 0x0c0);
+	case V4L2_CID_AUDIO_VOLUME:
-		wm8775_write(sd, R14, 0x1d4);
+	case V4L2_CID_AUDIO_BALANCE:
-		wm8775_write(sd, R15, 0x1d4);
+		wm8775_set_audio(sd, 0);
-		if (!ctrl->val)
+		return 0;
-			wm8775_write(sd, R21, 0x100 + state->input);
+	case V4L2_CID_AUDIO_LOUDNESS:
+		wm8775_write(sd, R17, (ctrl->val ? ALC_EN : 0) | ALC_HOLD);
 		return 0;
 	}
 	return -EINVAL;
@@ -144,16 +176,7 @@ static int wm8775_log_status(struct v4l2_subdev *sd)
 
 static int wm8775_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *freq)
 {
-	struct wm8775_state *state = to_state(sd);
+	wm8775_set_audio(sd, 0);
-
-	/* If I remove this, then it can happen that I have no
-	   sound the first time I tune from static to a valid channel.
-	   It's difficult to reproduce and is almost certainly related
-	   to the zero cross detect circuit. */
-	wm8775_write(sd, R21, 0x0c0);
-	wm8775_write(sd, R14, 0x1d4);
-	wm8775_write(sd, R15, 0x1d4);
-	wm8775_write(sd, R21, 0x100 + state->input);
 	return 0;
 }
 
@@ -203,6 +226,13 @@ static int wm8775_probe(struct i2c_client *client,
 {
 	struct wm8775_state *state;
 	struct v4l2_subdev *sd;
+	int err;
+	bool is_nova_s = false;
+
+	if (client->dev.platform_data) {
+		struct wm8775_platform_data *data = client->dev.platform_data;
+		is_nova_s = data->is_nova_s;
+	}
 
 	/* Check if the adapter supports the needed features */
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
@@ -218,13 +248,18 @@ static int wm8775_probe(struct i2c_client *client,
 	v4l2_i2c_subdev_init(sd, client, &wm8775_ops);
 	state->input = 2;
 
-	v4l2_ctrl_handler_init(&state->hdl, 1);
+	v4l2_ctrl_handler_init(&state->hdl, 4);
 	state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
 			V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
+	state->vol = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
+			V4L2_CID_AUDIO_VOLUME, 0, 65535, (65535+99)/100, 0xCF00); /* 0dB*/
+	state->bal = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
+			V4L2_CID_AUDIO_BALANCE, 0, 65535, (65535+99)/100, 32768);
+	state->loud = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
+			V4L2_CID_AUDIO_LOUDNESS, 0, 1, 1, 1);
 	sd->ctrl_handler = &state->hdl;
-	if (state->hdl.error) {
+	err = state->hdl.error;
-		int err = state->hdl.error;
+	if (err) {
-
 		v4l2_ctrl_handler_free(&state->hdl);
 		kfree(state);
 		return err;
@@ -236,12 +271,14 @@ static int wm8775_probe(struct i2c_client *client,
 	wm8775_write(sd, R23, 0x000);
 	/* Disable zero cross detect timeout */
 	wm8775_write(sd, R7, 0x000);
-	/* Left justified, 24-bit mode */
+	/* HPF enable, left justified, 24-bit (Philips) mode */
 	wm8775_write(sd, R11, 0x021);
 	/* Master mode, clock ratio 256fs */
 	wm8775_write(sd, R12, 0x102);
 	/* Powered up */
 	wm8775_write(sd, R13, 0x000);
+
+	if (!is_nova_s) {
 		/* ADC gain +2.5dB, enable zero cross */
 		wm8775_write(sd, R14, 0x1d4);
 		/* ADC gain +2.5dB, enable zero cross */
@@ -251,14 +288,27 @@ static int wm8775_probe(struct i2c_client *client,
 		/* Enable gain control, use zero cross detection,
 		   ALC hold time 42.6 ms */
 		wm8775_write(sd, R17, 0x185);
+	} else {
+		/* ALC stereo, ALC target level -5dB FS, ALC max gain +8dB */
+		wm8775_write(sd, R16, 0x1bb);
+		/* Set ALC mode and hold time */
+		wm8775_write(sd, R17, (state->loud->val ? ALC_EN : 0) | ALC_HOLD);
+	}
 	/* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */
 	wm8775_write(sd, R18, 0x0a2);
 	/* Enable noise gate, threshold -72dBfs */
 	wm8775_write(sd, R19, 0x005);
+	if (!is_nova_s) {
 		/* Transient window 4ms, lower PGA gain limit -1dB */
 		wm8775_write(sd, R20, 0x07a);
 		/* LRBOTH = 1, use input 2. */
 		wm8775_write(sd, R21, 0x102);
+	} else {
+		/* Transient window 4ms, ALC min gain -5dB  */
+		wm8775_write(sd, R20, 0x0fb);
+
+		wm8775_set_audio(sd, 1);      /* set volume/mute/mux */
+	}
 	return 0;
 }
 

include/media/wm8775.h

@@ -32,4 +32,13 @@
 #define WM8775_AIN3 4
 #define WM8775_AIN4 8
 
+
+struct wm8775_platform_data {
+	/*
+	 * FIXME: Instead, we should parametrize the params
+	 * that need different settings between ivtv, pvrusb2, and Nova-S
+	 */
+	bool is_nova_s;
+};
+
 #endif