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Commit a346caac authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
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[media] tvaudio: fix broken volume/balance calculations 



The balance control did not do what it is supposed to do due to wrong
calculations.

Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent ea01a83d

drivers/media/i2c/tvaudio.c

+27 −38
Original line number Diff line number Diff line
@@ -93,8 +93,8 @@ struct CHIPDESC { 
	/* which register has which value */

	int    leftreg,rightreg,treblereg,bassreg;



	/* initialize with (defaults to 65535/65535/32768/32768 */

	int    leftinit,rightinit,trebleinit,bassinit;

	/* initialize with (defaults to 65535/32768/32768 */

	int    volinit, trebleinit, bassinit;



	/* functions to convert the values (v4l -> chip) */

	getvalue volfunc,treblefunc,bassfunc;
@@ -122,7 +122,7 @@ struct CHIPSTATE { 
	audiocmd   shadow;



	/* current settings */

	__u16 left, right, treble, bass, muted;

	u16 volume, balance, treble, bass, muted;

	int prevmode;

	int radio;

	int input;
@@ -1523,8 +1523,7 @@ static struct CHIPDESC chiplist[] = { 
		.rightreg   = TDA9875_MVR,

		.bassreg    = TDA9875_MBA,

		.treblereg  = TDA9875_MTR,

		.leftinit   = 58880,

		.rightinit  = 58880,

		.volinit    = 58880,

	},

	{

		.name       = "tda9850",
@@ -1694,20 +1693,13 @@ static int tvaudio_g_ctrl(struct v4l2_subdev *sd, 
	case V4L2_CID_AUDIO_VOLUME:

		if (!(desc->flags & CHIP_HAS_VOLUME))

			break;

		ctrl->value = max(chip->left,chip->right);

		ctrl->value = chip->volume;

		return 0;

	case V4L2_CID_AUDIO_BALANCE:

	{

		int volume;

		if (!(desc->flags & CHIP_HAS_VOLUME))

			break;

		volume = max(chip->left,chip->right);

		if (volume)

			ctrl->value=(32768*min(chip->left,chip->right))/volume;

		else

			ctrl->value=32768;

		ctrl->value = chip->balance;

		return 0;

	}

	case V4L2_CID_AUDIO_BASS:

		if (!(desc->flags & CHIP_HAS_BASSTREBLE))

			break;
@@ -1744,41 +1736,38 @@ static int tvaudio_s_ctrl(struct v4l2_subdev *sd, 
		return 0;

	case V4L2_CID_AUDIO_VOLUME:

	{

		int volume,balance;

		u32 volume, balance;

		u32 left, right;



		if (!(desc->flags & CHIP_HAS_VOLUME))

			break;



		volume = max(chip->left,chip->right);

		if (volume)

			balance=(32768*min(chip->left,chip->right))/volume;

		else

			balance=32768;



		volume = ctrl->value;

		chip->left = (min(65536 - balance,32768) * volume) / 32768;

		chip->right = (min(balance,volume *(__u16)32768)) / 32768;



		chip_write(chip,desc->leftreg,desc->volfunc(chip->left));

		chip_write(chip,desc->rightreg,desc->volfunc(chip->right));

		chip->volume = volume;

		balance = chip->balance;

		left = (min(65536U - balance, 32768U) * volume) / 32768U;

		right = (min(balance, 32768U) * volume) / 32768U;



		chip_write(chip, desc->leftreg, desc->volfunc(left));

		chip_write(chip, desc->rightreg, desc->volfunc(right));

		return 0;

	}

	case V4L2_CID_AUDIO_BALANCE:

	{

		int volume, balance;

		u32 volume, balance;

		u32 left, right;



		if (!(desc->flags & CHIP_HAS_VOLUME))

			break;



		volume = max(chip->left, chip->right);

		balance = ctrl->value;

		chip->left = (min(65536 - balance, 32768) * volume) / 32768;

		chip->right = (min(balance, volume * (__u16)32768)) / 32768;



		chip_write(chip, desc->leftreg, desc->volfunc(chip->left));

		chip_write(chip, desc->rightreg, desc->volfunc(chip->right));

		chip->balance = balance;

		volume = chip->volume;

		left = (min(65536U - balance, 32768U) * volume) / 32768U;

		right = (min(balance, 32768U) * volume) / 32768U;



		chip_write(chip, desc->leftreg, desc->volfunc(left));

		chip_write(chip, desc->rightreg, desc->volfunc(right));

		return 0;

	}

	case V4L2_CID_AUDIO_BASS:
@@ -2043,12 +2032,12 @@ static int tvaudio_probe(struct i2c_client *client, const struct i2c_device_id * 
			v4l2_info(sd, "volume callback undefined!\n");

			desc->flags &= ~CHIP_HAS_VOLUME;

		} else {

			chip->left  = desc->leftinit  ? desc->leftinit  : 65535;

			chip->right = desc->rightinit ? desc->rightinit : 65535;

			chip->volume = desc->volinit ? desc->volinit : 65535;

			chip->balance = 32768;

			chip_write(chip, desc->leftreg,

				   desc->volfunc(chip->left));

				   desc->volfunc(chip->volume));

			chip_write(chip, desc->rightreg,

				   desc->volfunc(chip->right));

				   desc->volfunc(chip->volume));

		}

	}

	if (desc->flags & CHIP_HAS_BASSTREBLE) {