[Patch 2/2] stv06xx webcams with HDCS 1xxx sensors

[Patch 2/2] stv06xx webcams with HDCS 1xxx sensors

[James Blanford]

Quickcam Express 046d:0840 and maybe others

Driver version:  v 2.60 from 2.6.31-rc7

Due to rounding and clipping, exposure and gain settings do not map to
unique register values.  Rather than read the registers and report gain
and exposure that may be different than the values that were set, just
cache the latest values that were set and report them.  Reduce exposure
range from 0-65535 to 0-255 so libv4l's autogain doesn't take forever.
Remove vestiges of driver signal processing that is now handled by
libv4l.

Signed-off-by: James Blanford <jhblanford@gmail.com>
diff -upr a/drivers/media/video/gspca/stv06xx/stv06xx_hdcs.c b/drivers/media/video/gspca/stv06xx/stv06xx_hdcs.c
--- a/drivers/media/video/gspca/stv06xx/stv06xx_hdcs.c	2009-09-09 14:59:35.000000000 -0400
+++ b/drivers/media/video/gspca/stv06xx/stv06xx_hdcs.c	2009-09-09 16:30:08.000000000 -0400
@@ -37,7 +37,7 @@ static const struct ctrl hdcs1x00_ctrl[]
 			.type		= V4L2_CTRL_TYPE_INTEGER,
 			.name		= "exposure",
 			.minimum	= 0x00,
-			.maximum	= 0xffff,
+			.maximum	= 0xff,
 			.step		= 0x1,
 			.default_value 	= HDCS_DEFAULT_EXPOSURE,
 			.flags         	= V4L2_CTRL_FLAG_SLIDER
@@ -120,6 +120,7 @@ struct hdcs {
 	} exp;
 
 	int psmp;
+	u8 exp_cache, gain_cache;
 };
 
 static int hdcs_reg_write_seq(struct sd *sd, u8 reg, u8 *vals, u8 len)
@@ -205,34 +206,8 @@ static int hdcs_get_exposure(struct gspc
 	struct sd *sd = (struct sd *) gspca_dev;
 	struct hdcs *hdcs = sd->sensor_priv;
 
-	/* Column time period */
-	int ct;
-	/* Column processing period */
-	int cp;
-	/* Row processing period */
-	int rp;
-	int cycles;
-	int err;
-	int rowexp;
-	u16 data[2];
-
-	err = stv06xx_read_sensor(sd, HDCS_ROWEXPL, &data[0]);
-	if (err < 0)
-		return err;
-
-	err = stv06xx_read_sensor(sd, HDCS_ROWEXPH, &data[1]);
-	if (err < 0)
-		return err;
-
-	rowexp = (data[1] << 8) | data[0];
+	*val = hdcs->exp_cache;
 
-	ct = hdcs->exp.cto + hdcs->psmp + (HDCS_ADC_START_SIG_DUR + 2);
-	cp = hdcs->exp.cto + (hdcs->w * ct / 2);
-	rp = hdcs->exp.rs + cp;
-
-	cycles = rp * rowexp;
-	*val = cycles / HDCS_CLK_FREQ_MHZ;
-	PDEBUG(D_V4L2, "Read exposure %d", *val);
 	return 0;
 }
 
@@ -254,7 +229,10 @@ static int hdcs_set_exposure(struct gspc
 	int cycles, err;
 	u8 exp[14];
 
-	cycles = val * HDCS_CLK_FREQ_MHZ;
+	val &= 0xff;
+	hdcs->exp_cache = val;
+
+	cycles = val * HDCS_CLK_FREQ_MHZ * 257;
 
 	ct = hdcs->exp.cto + hdcs->psmp + (HDCS_ADC_START_SIG_DUR + 2);
 	cp = hdcs->exp.cto + (hdcs->w * ct / 2);
@@ -325,49 +303,42 @@ static int hdcs_set_exposure(struct gspc
 	return err;
 }
 
-static int hdcs_set_gains(struct sd *sd, u8 r, u8 g, u8 b)
+static int hdcs_set_gains(struct sd *sd, u8 g)
 {
+	struct hdcs *hdcs = sd->sensor_priv;
+	int err;
 	u8 gains[4];
 
+	hdcs->gain_cache = g;
+
 	/* the voltage gain Av = (1 + 19 * val / 127) * (1 + bit7) */
-	if (r > 127)
-		r = 0x80 | (r / 2);
 	if (g > 127)
 		g = 0x80 | (g / 2);
-	if (b > 127)
-		b = 0x80 | (b / 2);
 
 	gains[0] = g;
-	gains[1] = r;
-	gains[2] = b;
+	gains[1] = g;
+	gains[2] = g;
 	gains[3] = g;
 
-	return hdcs_reg_write_seq(sd, HDCS_ERECPGA, gains, 4);
+	err = hdcs_reg_write_seq(sd, HDCS_ERECPGA, gains, 4);
+		return err;
 }
 
 static int hdcs_get_gain(struct gspca_dev *gspca_dev, __s32 *val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
-	int err;
-	u16 data;
+	struct hdcs *hdcs = sd->sensor_priv;
 
-	err = stv06xx_read_sensor(sd, HDCS_ERECPGA, &data);
+	*val = hdcs->gain_cache;
 
-	/* Bit 7 doubles the gain */
-	if (data & 0x80)
-		*val = (data & 0x7f) * 2;
-	else
-		*val = data;
-
-	PDEBUG(D_V4L2, "Read gain %d", *val);
-	return err;
+	return 0;
 }
 
 static int hdcs_set_gain(struct gspca_dev *gspca_dev, __s32 val)
 {
 	PDEBUG(D_V4L2, "Writing gain %d", val);
 	return hdcs_set_gains((struct sd *) gspca_dev,
-			       val & 0xff, val & 0xff, val & 0xff);
+			       val & 0xff);
 }
 
 static int hdcs_set_size(struct sd *sd,
@@ -585,8 +556,7 @@ static int hdcs_init(struct sd *sd)
 	if (err < 0)
 		return err;
 
-	err = hdcs_set_gains(sd, HDCS_DEFAULT_GAIN, HDCS_DEFAULT_GAIN,
-			     HDCS_DEFAULT_GAIN);
+	err = hdcs_set_gains(sd, HDCS_DEFAULT_GAIN);
 	if (err < 0)
 		return err;
 
diff -upr a/drivers/media/video/gspca/stv06xx/stv06xx_hdcs.h b/drivers/media/video/gspca/stv06xx/stv06xx_hdcs.h
--- a/drivers/media/video/gspca/stv06xx/stv06xx_hdcs.h	2009-09-01 13:36:04.000000000 -0400
+++ b/drivers/media/video/gspca/stv06xx/stv06xx_hdcs.h	2009-09-09 16:05:43.000000000 -0400
@@ -124,7 +124,7 @@
 #define HDCS_RUN_ENABLE		(1 << 2)
 #define HDCS_SLEEP_MODE		(1 << 1)
 
-#define HDCS_DEFAULT_EXPOSURE	5000
+#define HDCS_DEFAULT_EXPOSURE	48
 #define HDCS_DEFAULT_GAIN	128
 
 static int hdcs_probe_1x00(struct sd *sd);

Re: [Patch 2/2] stv06xx webcams with HDCS 1xxx sensors

[Erik Andrén]

2009/9/9 James Blanford <jhblanford@gmail.com>:
> Quickcam Express 046d:0840 and maybe others
>
> Driver version:  v 2.60 from 2.6.31-rc7
>
> Due to rounding and clipping, exposure and gain settings do not map to
> unique register values.  Rather than read the registers and report gain
> and exposure that may be different than the values that were set, just
> cache the latest values that were set and report them.  Reduce exposure
> range from 0-65535 to 0-255 so libv4l's autogain doesn't take forever.
> Remove vestiges of driver signal processing that is now handled by
> libv4l.
>
> Signed-off-by: James Blanford <jhblanford@gmail.com>
> diff -upr a/drivers/media/video/gspca/stv06xx/stv06xx_hdcs.c b/drivers/media/video/gspca/stv06xx/stv06xx_hdcs.c
> --- a/drivers/media/video/gspca/stv06xx/stv06xx_hdcs.c  2009-09-09 14:59:35.000000000 -0400
> +++ b/drivers/media/video/gspca/stv06xx/stv06xx_hdcs.c  2009-09-09 16:30:08.000000000 -0400
> @@ -37,7 +37,7 @@ static const struct ctrl hdcs1x00_ctrl[]
>                        .type           = V4L2_CTRL_TYPE_INTEGER,
>                        .name           = "exposure",
>                        .minimum        = 0x00,
> -                       .maximum        = 0xffff,
> +                       .maximum        = 0xff,
>                        .step           = 0x1,
>                        .default_value  = HDCS_DEFAULT_EXPOSURE,
>                        .flags          = V4L2_CTRL_FLAG_SLIDER
> @@ -120,6 +120,7 @@ struct hdcs {
>        } exp;
>
>        int psmp;
> +       u8 exp_cache, gain_cache;
>  };
>
>  static int hdcs_reg_write_seq(struct sd *sd, u8 reg, u8 *vals, u8 len)
> @@ -205,34 +206,8 @@ static int hdcs_get_exposure(struct gspc
>        struct sd *sd = (struct sd *) gspca_dev;
>        struct hdcs *hdcs = sd->sensor_priv;
>
> -       /* Column time period */
> -       int ct;
> -       /* Column processing period */
> -       int cp;
> -       /* Row processing period */
> -       int rp;
> -       int cycles;
> -       int err;
> -       int rowexp;
> -       u16 data[2];
> -
> -       err = stv06xx_read_sensor(sd, HDCS_ROWEXPL, &data[0]);
> -       if (err < 0)
> -               return err;
> -
> -       err = stv06xx_read_sensor(sd, HDCS_ROWEXPH, &data[1]);
> -       if (err < 0)
> -               return err;
> -
> -       rowexp = (data[1] << 8) | data[0];
> +       *val = hdcs->exp_cache;
>
> -       ct = hdcs->exp.cto + hdcs->psmp + (HDCS_ADC_START_SIG_DUR + 2);
> -       cp = hdcs->exp.cto + (hdcs->w * ct / 2);
> -       rp = hdcs->exp.rs + cp;
> -
> -       cycles = rp * rowexp;
> -       *val = cycles / HDCS_CLK_FREQ_MHZ;
> -       PDEBUG(D_V4L2, "Read exposure %d", *val);
>        return 0;
>  }
>
> @@ -254,7 +229,10 @@ static int hdcs_set_exposure(struct gspc
>        int cycles, err;
>        u8 exp[14];
>
> -       cycles = val * HDCS_CLK_FREQ_MHZ;
> +       val &= 0xff;
> +       hdcs->exp_cache = val;
> +
> +       cycles = val * HDCS_CLK_FREQ_MHZ * 257;

Why 257 here? I guess it is some kind of expansion factor.

>
>        ct = hdcs->exp.cto + hdcs->psmp + (HDCS_ADC_START_SIG_DUR + 2);
>        cp = hdcs->exp.cto + (hdcs->w * ct / 2);
> @@ -325,49 +303,42 @@ static int hdcs_set_exposure(struct gspc
>        return err;
>  }
>
> -static int hdcs_set_gains(struct sd *sd, u8 r, u8 g, u8 b)
> +static int hdcs_set_gains(struct sd *sd, u8 g)
>  {
> +       struct hdcs *hdcs = sd->sensor_priv;
> +       int err;
>        u8 gains[4];
>
> +       hdcs->gain_cache = g;
> +
>        /* the voltage gain Av = (1 + 19 * val / 127) * (1 + bit7) */
> -       if (r > 127)
> -               r = 0x80 | (r / 2);
>        if (g > 127)
>                g = 0x80 | (g / 2);
> -       if (b > 127)
> -               b = 0x80 | (b / 2);
>
>        gains[0] = g;
> -       gains[1] = r;
> -       gains[2] = b;
> +       gains[1] = g;
> +       gains[2] = g;
>        gains[3] = g;
>
> -       return hdcs_reg_write_seq(sd, HDCS_ERECPGA, gains, 4);
> +       err = hdcs_reg_write_seq(sd, HDCS_ERECPGA, gains, 4);
> +               return err;
>  }
>
>  static int hdcs_get_gain(struct gspca_dev *gspca_dev, __s32 *val)
>  {
>        struct sd *sd = (struct sd *) gspca_dev;
> -       int err;
> -       u16 data;
> +       struct hdcs *hdcs = sd->sensor_priv;
>
> -       err = stv06xx_read_sensor(sd, HDCS_ERECPGA, &data);
> +       *val = hdcs->gain_cache;
>
> -       /* Bit 7 doubles the gain */
> -       if (data & 0x80)
> -               *val = (data & 0x7f) * 2;
> -       else
> -               *val = data;
> -
> -       PDEBUG(D_V4L2, "Read gain %d", *val);
> -       return err;
> +       return 0;
>  }
>
>  static int hdcs_set_gain(struct gspca_dev *gspca_dev, __s32 val)
>  {
>        PDEBUG(D_V4L2, "Writing gain %d", val);
>        return hdcs_set_gains((struct sd *) gspca_dev,
> -                              val & 0xff, val & 0xff, val & 0xff);
> +                              val & 0xff);
>  }
>
>  static int hdcs_set_size(struct sd *sd,
> @@ -585,8 +556,7 @@ static int hdcs_init(struct sd *sd)
>        if (err < 0)
>                return err;
>
> -       err = hdcs_set_gains(sd, HDCS_DEFAULT_GAIN, HDCS_DEFAULT_GAIN,
> -                            HDCS_DEFAULT_GAIN);
> +       err = hdcs_set_gains(sd, HDCS_DEFAULT_GAIN);
>        if (err < 0)
>                return err;
>
> diff -upr a/drivers/media/video/gspca/stv06xx/stv06xx_hdcs.h b/drivers/media/video/gspca/stv06xx/stv06xx_hdcs.h
> --- a/drivers/media/video/gspca/stv06xx/stv06xx_hdcs.h  2009-09-01 13:36:04.000000000 -0400
> +++ b/drivers/media/video/gspca/stv06xx/stv06xx_hdcs.h  2009-09-09 16:05:43.000000000 -0400
> @@ -124,7 +124,7 @@
>  #define HDCS_RUN_ENABLE                (1 << 2)
>  #define HDCS_SLEEP_MODE                (1 << 1)
>
> -#define HDCS_DEFAULT_EXPOSURE  5000
> +#define HDCS_DEFAULT_EXPOSURE  48
>  #define HDCS_DEFAULT_GAIN      128
>
>  static int hdcs_probe_1x00(struct sd *sd);
>

Looks good!
Thanks,

Acked-by: Erik Andrén <erik.andren@gmail.com>

Re: [Patch 2/2] stv06xx webcams with HDCS 1xxx sensors

[Hans de Goede]

Hi,

On 09/10/2009 09:51 AM, Erik Andrén wrote:

<snip>

>
> Looks good!
> Thanks,
>
> Acked-by: Erik Andrén<erik.andren@gmail.com>

Erik,

Are you going to merge these 2 patches in your tree, and let them find
their way into the master this way, or shall I merge them in my tree ?

Regards,

Hans

Re: [Patch 2/2] stv06xx webcams with HDCS 1xxx sensors

[Erik Andrén]

2009/9/13 Hans de Goede <hdegoede@redhat.com>:
> Hi,
>
> On 09/10/2009 09:51 AM, Erik Andrén wrote:
>
> <snip>
>
>>
>> Looks good!
>> Thanks,
>>
>> Acked-by: Erik Andrén<erik.andren@gmail.com>
>
> Erik,
>
> Are you going to merge these 2 patches in your tree, and let them find
> their way into the master this way, or shall I merge them in my tree ?
>

Hi,
I was under the impression that Jean-Francois took stv06xx patches
directly into his tree.
But you can of course take them too if you want to.

Best regards,
Erik

> Regards,
>
> Hans
>
>

Re: [Patch 2/2] stv06xx webcams with HDCS 1xxx sensors

[Erik Andrén]

2009/9/13 Hans de Goede <hdegoede@redhat.com>:
> Hi,
>
> On 09/10/2009 09:51 AM, Erik Andrén wrote:
>
> <snip>
>
>>
>> Looks good!
>> Thanks,
>>
>> Acked-by: Erik Andrén<erik.andren@gmail.com>
>
> Erik,
>
> Are you going to merge these 2 patches in your tree, and let them find
> their way into the master this way, or shall I merge them in my tree ?
>

Also,
It would be good if you are able to test the patches as you have HDCS
based hardware.

Best regards,
Erik

> Regards,
>
> Hans
>
>