[media] gspca - ov534: Add Hue control

Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 63 insertions, 2 deletions

diff --git a/drivers/media/video/gspca/ov534.c b/drivers/media/video/gspca/ov534.c
index c15cf23d7758..b5acb1e4b4e7 100644
--- a/drivers/media/video/gspca/ov534.c
+++ b/drivers/media/video/gspca/ov534.c
@@ -34,6 +34,8 @@
 
 #include "gspca.h"
 
+#include <linux/fixp-arith.h>
+
 #define OV534_REG_ADDRESS       0xf1    /* sensor address */
 #define OV534_REG_SUBADDR       0xf2
 #define OV534_REG_WRITE         0xf3
@@ -53,6 +55,7 @@ MODULE_LICENSE("GPL");
 
 /* controls */
 enum e_ctrl {
+        HUE,
         SATURATION,
         BRIGHTNESS,
         CONTRAST,
@@ -87,6 +90,7 @@ enum sensors {
 };
 
 /* V4L2 controls supported by the driver */
+static void sethue(struct gspca_dev *gspca_dev);
 static void setsaturation(struct gspca_dev *gspca_dev);
 static void setbrightness(struct gspca_dev *gspca_dev);
 static void setcontrast(struct gspca_dev *gspca_dev);
@@ -103,6 +107,18 @@ static int sd_start(struct gspca_dev *gspca_dev);
 static void sd_stopN(struct gspca_dev *gspca_dev);
 
 static const struct ctrl sd_ctrls[] = {
+[HUE] = {
+                {
+                        .id      = V4L2_CID_HUE,
+                        .type    = V4L2_CTRL_TYPE_INTEGER,
+                        .name    = "Hue",
+                        .minimum = -90,
+                        .maximum = 90,
+                        .step    = 1,
+                        .default_value = 0,
+                },
+                .set_control = sethue
+        },
 [SATURATION] = {
                 {
                         .id      = V4L2_CID_SATURATION,
@@ -684,7 +700,7 @@ static const u8 sensor_init_772x[][2] = {
         { 0x9c, 0x20 },
         { 0x9e, 0x81 },
 
-        { 0xa6, 0x06 },
+        { 0xa6, 0x07 },
         { 0x7e, 0x0c },
         { 0x7f, 0x16 },
         { 0x80, 0x2a },
@@ -955,6 +971,48 @@ static void set_frame_rate(struct gspca_dev *gspca_dev)
         PDEBUG(D_PROBE, "frame_rate: %d", r->fps);
 }
 
+static void sethue(struct gspca_dev *gspca_dev)
+{
+        struct sd *sd = (struct sd *) gspca_dev;
+        int val;
+
+        val = sd->ctrls[HUE].val;
+        if (sd->sensor == SENSOR_OV767x) {
+                /* TBD */
+        } else {
+                s16 huesin;
+                s16 huecos;
+
+                /* fixp_sin and fixp_cos accept only positive values, while
+                 * our val is between -90 and 90
+                 */
+                val += 360;
+
+                /* According to the datasheet the registers expect HUESIN and
+                 * HUECOS to be the result of the trigonometric functions,
+                 * scaled by 0x80.
+                 *
+                 * The 0x100 here represents the maximun absolute value
+                 * returned byt fixp_sin and fixp_cos, so the scaling will
+                 * consider the result like in the interval [-1.0, 1.0].
+                 */
+                huesin = fixp_sin(val) * 0x80 / 0x100;
+                huecos = fixp_cos(val) * 0x80 / 0x100;
+
+                if (huesin < 0) {
+                        sccb_reg_write(gspca_dev, 0xab,
+                                sccb_reg_read(gspca_dev, 0xab) | 0x2);
+                        huesin = -huesin;
+                } else {
+                        sccb_reg_write(gspca_dev, 0xab,
+                                sccb_reg_read(gspca_dev, 0xab) & ~0x2);
+
+                }
+                sccb_reg_write(gspca_dev, 0xa9, (u8)huecos);
+                sccb_reg_write(gspca_dev, 0xaa, (u8)huesin);
+        }
+}
+
 static void setsaturation(struct gspca_dev *gspca_dev)
 {
         struct sd *sd = (struct sd *) gspca_dev;
@@ -1231,7 +1289,8 @@ static int sd_init(struct gspca_dev *gspca_dev)
 
         if ((sensor_id & 0xfff0) == 0x7670) {
                 sd->sensor = SENSOR_OV767x;
-                gspca_dev->ctrl_dis = (1 << GAIN) |
+                gspca_dev->ctrl_dis = (1 << HUE) |
+                                        (1 << GAIN) |
                                         (1 << AGC) |
                                         (1 << SHARPNESS);       /* auto */
                 sd->ctrls[SATURATION].min = 0,
@@ -1310,6 +1369,8 @@ static int sd_start(struct gspca_dev *gspca_dev)
 
         set_frame_rate(gspca_dev);
 
+        if (!(gspca_dev->ctrl_dis & (1 << HUE)))
+                sethue(gspca_dev);
         setsaturation(gspca_dev);
         if (!(gspca_dev->ctrl_dis & (1 << AGC)))
                 setagc(gspca_dev);