[media] wm8775: Revert changeset fcb9757333 to avoid a regression

It seems that cx88 and ivtv use wm8775 on some different modes. The
patch that added support for a board with wm8775 broke ivtv boards with
this device. As we're too close to release 2.6.37, let's just revert
it.

Reported-by: Andy Walls <awalls@md.metrocast.net>
Reported-by: Eric Sharkey <eric@lisaneric.org>
Reported-by: Auric <auric@aanet.com.au>
Reported by: David Gesswein <djg@pdp8online.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 39 insertions, 65 deletions

diff --git a/drivers/media/video/wm8775.c b/drivers/media/video/wm8775.c
index 13552564908..fe8ef6419f8 100644
--- a/drivers/media/video/wm8775.c
+++ b/drivers/media/video/wm8775.c
@@ -35,7 +35,6 @@
 #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");
@@ -51,16 +50,10 @@ 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) */
 };
 
@@ -92,30 +85,6 @@ 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)
 {
@@ -133,26 +102,25 @@ static int wm8775_s_routing(struct v4l2_subdev *sd,
 	state->input = input;
 	if (!v4l2_ctrl_g_ctrl(state->mute))
 		return 0;
-	if (!v4l2_ctrl_g_ctrl(state->vol))
-		return 0;
-	if (!v4l2_ctrl_g_ctrl(state->bal))
-		return 0;
-	wm8775_set_audio(sd, 1);
+	wm8775_write(sd, R21, 0x0c0);
+	wm8775_write(sd, R14, 0x1d4);
+	wm8775_write(sd, R15, 0x1d4);
+	wm8775_write(sd, R21, 0x100 + state->input);
 	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:
-	case V4L2_CID_AUDIO_VOLUME:
-	case V4L2_CID_AUDIO_BALANCE:
-		wm8775_set_audio(sd, 0);
-		return 0;
-	case V4L2_CID_AUDIO_LOUDNESS:
-		wm8775_write(sd, R17, (ctrl->val ? ALC_EN : 0) | ALC_HOLD);
+		wm8775_write(sd, R21, 0x0c0);
+		wm8775_write(sd, R14, 0x1d4);
+		wm8775_write(sd, R15, 0x1d4);
+		if (!ctrl->val)
+			wm8775_write(sd, R21, 0x100 + state->input);
 		return 0;
 	}
 	return -EINVAL;
@@ -176,7 +144,16 @@ static int wm8775_log_status(struct v4l2_subdev *sd)
 
 static int wm8775_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *freq)
 {
-	wm8775_set_audio(sd, 0);
+	struct wm8775_state *state = to_state(sd);
+
+	/* 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;
 }
 
@@ -226,7 +203,6 @@ static int wm8775_probe(struct i2c_client *client,
 {
 	struct wm8775_state *state;
 	struct v4l2_subdev *sd;
-	int err;
 
 	/* Check if the adapter supports the needed features */
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
@@ -240,21 +216,15 @@ static int wm8775_probe(struct i2c_client *client,
 		return -ENOMEM;
 	sd = &state->sd;
 	v4l2_i2c_subdev_init(sd, client, &wm8775_ops);
-	sd->grp_id = WM8775_GID; /* subdev group id */
 	state->input = 2;
 
-	v4l2_ctrl_handler_init(&state->hdl, 4);
+	v4l2_ctrl_handler_init(&state->hdl, 1);
 	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;
-	err = state->hdl.error;
-	if (err) {
+	if (state->hdl.error) {
+		int err = state->hdl.error;
+
 		v4l2_ctrl_handler_free(&state->hdl);
 		kfree(state);
 		return err;
@@ -266,25 +236,29 @@ static int wm8775_probe(struct i2c_client *client,
 	wm8775_write(sd, R23, 0x000);
 	/* Disable zero cross detect timeout */
 	wm8775_write(sd, R7, 0x000);
-	/* HPF enable, I2S mode, 24-bit */
-	wm8775_write(sd, R11, 0x022);
+	/* Left justified, 24-bit mode */
+	wm8775_write(sd, R11, 0x021);
 	/* Master mode, clock ratio 256fs */
 	wm8775_write(sd, R12, 0x102);
 	/* Powered up */
 	wm8775_write(sd, R13, 0x000);
-	/* 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);
+	/* ADC gain +2.5dB, enable zero cross */
+	wm8775_write(sd, R14, 0x1d4);
+	/* ADC gain +2.5dB, enable zero cross */
+	wm8775_write(sd, R15, 0x1d4);
+	/* ALC Stereo, ALC target level -1dB FS max gain +8dB */
+	wm8775_write(sd, R16, 0x1bf);
+	/* Enable gain control, use zero cross detection,
+	   ALC hold time 42.6 ms */
+	wm8775_write(sd, R17, 0x185);
 	/* 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);
-	/* Transient window 4ms, ALC min gain -5dB  */
-	wm8775_write(sd, R20, 0x0fb);
-
-	wm8775_set_audio(sd, 1);      /* set volume/mute/mux */
-
+	/* Transient window 4ms, lower PGA gain limit -1dB */
+	wm8775_write(sd, R20, 0x07a);
+	/* LRBOTH = 1, use input 2. */
+	wm8775_write(sd, R21, 0x102);
 	return 0;
 }