V4L/DVB: gspca - ov534: Add Powerline Frequency control

Note that setting this options to 50Hz can reduce the framerate, so it is
still disabled (60Hz) by default.

Signed-off-by: Mosalam Ebrahimi <m.ebrahimi@ieee.org>
Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 70 insertions, 1 deletions

diff --git a/drivers/media/video/gspca/ov534.c b/drivers/media/video/gspca/ov534.c
index 878384442482..29af17e173d5 100644
--- a/drivers/media/video/gspca/ov534.c
+++ b/drivers/media/video/gspca/ov534.c
@@ -66,7 +66,7 @@ struct sd {
         s8 sharpness;
         u8 hflip;
         u8 vflip;
-
+        u8 freqfltr;
 };
 
 /* V4L2 controls supported by the driver */
@@ -90,6 +90,10 @@ static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val);
 static int sd_getbrightness(struct gspca_dev *gspca_dev, __s32 *val);
 static int sd_setcontrast(struct gspca_dev *gspca_dev, __s32 val);
 static int sd_getcontrast(struct gspca_dev *gspca_dev, __s32 *val);
+static int sd_setfreqfltr(struct gspca_dev *gspca_dev, __s32 val);
+static int sd_getfreqfltr(struct gspca_dev *gspca_dev, __s32 *val);
+static int sd_querymenu(struct gspca_dev *gspca_dev,
+                struct v4l2_querymenu *menu);
 
 static const struct ctrl sd_ctrls[] = {
         {       /* 0 */
@@ -233,6 +237,20 @@ static const struct ctrl sd_ctrls[] = {
                 .set = sd_setvflip,
                 .get = sd_getvflip,
         },
+        {       /* 10 */
+                {
+                        .id      = V4L2_CID_POWER_LINE_FREQUENCY,
+                        .type    = V4L2_CTRL_TYPE_MENU,
+                        .name    = "Light Frequency Filter",
+                        .minimum = 0,
+                        .maximum = 1,
+                        .step    = 1,
+#define FREQFLTR_DEF 0
+                        .default_value = FREQFLTR_DEF,
+                },
+                .set = sd_setfreqfltr,
+                .get = sd_getfreqfltr,
+        },
 };
 
 static const struct v4l2_pix_format ov772x_mode[] = {
@@ -784,6 +802,17 @@ static void setvflip(struct gspca_dev *gspca_dev)
                                 sccb_reg_read(gspca_dev, 0x0c) & ~0x80);
 }
 
+static void setfreqfltr(struct gspca_dev *gspca_dev)
+{
+        struct sd *sd = (struct sd *) gspca_dev;
+
+        if (sd->freqfltr == 0)
+                sccb_reg_write(gspca_dev, 0x2b, 0x00);
+        else
+                sccb_reg_write(gspca_dev, 0x2b, 0x9e);
+}
+
+
 /* this function is called at probe time */
 static int sd_config(struct gspca_dev *gspca_dev,
                      const struct usb_device_id *id)
@@ -817,6 +846,7 @@ static int sd_config(struct gspca_dev *gspca_dev,
         sd->sharpness = SHARPNESS_DEF;
         sd->hflip = HFLIP_DEF;
         sd->vflip = VFLIP_DEF;
+        sd->freqfltr = FREQFLTR_DEF;
 
         return 0;
 }
@@ -886,6 +916,7 @@ static int sd_start(struct gspca_dev *gspca_dev)
         setsharpness(gspca_dev);
         setvflip(gspca_dev);
         sethflip(gspca_dev);
+        setfreqfltr(gspca_dev);
 
         ov534_set_led(gspca_dev, 1);
         ov534_reg_write(gspca_dev, 0xe0, 0x00);
@@ -1179,6 +1210,43 @@ static int sd_getvflip(struct gspca_dev *gspca_dev, __s32 *val)
         return 0;
 }
 
+static int sd_setfreqfltr(struct gspca_dev *gspca_dev, __s32 val)
+{
+        struct sd *sd = (struct sd *) gspca_dev;
+
+        sd->freqfltr = val;
+        if (gspca_dev->streaming)
+                setfreqfltr(gspca_dev);
+        return 0;
+}
+
+static int sd_getfreqfltr(struct gspca_dev *gspca_dev, __s32 *val)
+{
+        struct sd *sd = (struct sd *) gspca_dev;
+
+        *val = sd->freqfltr;
+        return 0;
+}
+
+static int sd_querymenu(struct gspca_dev *gspca_dev,
+                struct v4l2_querymenu *menu)
+{
+        switch (menu->id) {
+        case V4L2_CID_POWER_LINE_FREQUENCY:
+                switch (menu->index) {
+                case 0:         /* V4L2_CID_POWER_LINE_FREQUENCY_DISABLED */
+                        strcpy((char *) menu->name, "Disabled");
+                        return 0;
+                case 1:         /* V4L2_CID_POWER_LINE_FREQUENCY_50HZ */
+                        strcpy((char *) menu->name, "50 Hz");
+                        return 0;
+                }
+                break;
+        }
+
+        return -EINVAL;
+}
+
 /* get stream parameters (framerate) */
 static int sd_get_streamparm(struct gspca_dev *gspca_dev,
                              struct v4l2_streamparm *parm)
@@ -1230,6 +1298,7 @@ static const struct sd_desc sd_desc = {
         .start    = sd_start,
         .stopN    = sd_stopN,
         .pkt_scan = sd_pkt_scan,
+        .querymenu = sd_querymenu,
         .get_streamparm = sd_get_streamparm,
         .set_streamparm = sd_set_streamparm,
 };