drivers/video: fsl-diu-fb: add support for set_gamma ioctls

The MPC5121 BSP comes with a gamma_set utility that initializes the gamma
table via an ioctl.  Unfortunately, the ioctl number that utility uses
is defined improperly, but we can still support it.

Signed-off-by: Timur Tabi <timur@freescale.com>

2 files changed, 26 insertions, 0 deletions

diff --git a/drivers/video/fsl-diu-fb.c b/drivers/video/fsl-diu-fb.c
index 5b12e1783fac..9c4054760627 100644
--- a/drivers/video/fsl-diu-fb.c
+++ b/drivers/video/fsl-diu-fb.c
@@ -1181,6 +1181,23 @@ static int fsl_diu_ioctl(struct fb_info *info, unsigned int cmd,
                         ad->ckmin_b = ck.blue_min;
                 }
                 break;
+#ifdef CONFIG_PPC_MPC512x
+        case MFB_SET_GAMMA: {
+                struct fsl_diu_data *data = mfbi->parent;
+
+                if (copy_from_user(data->gamma, buf, sizeof(data->gamma)))
+                        return -EFAULT;
+                setbits32(&data->diu_reg->gamma, 0); /* Force table reload */
+                break;
+        }
+        case MFB_GET_GAMMA: {
+                struct fsl_diu_data *data = mfbi->parent;
+
+                if (copy_to_user(buf, data->gamma, sizeof(data->gamma)))
+                        return -EFAULT;
+                break;
+        }
+#endif
         default:
                 dev_err(info->dev, "unknown ioctl command (0x%08X)\n", cmd);
                 return -ENOIOCTLCMD;
diff --git a/include/linux/fsl-diu-fb.h b/include/linux/fsl-diu-fb.h
index 11c16a1fb9e3..a1e8277120c7 100644
--- a/include/linux/fsl-diu-fb.h
+++ b/include/linux/fsl-diu-fb.h
@@ -47,6 +47,15 @@ struct aoi_display_offset {
 #define MFB_GET_PIXFMT          _IOR('M', 8, __u32)
 
 /*
+ * The MPC5121 BSP comes with a gamma_set utility that initializes the
+ * gamma table.  Unfortunately, it uses bad values for the IOCTL commands,
+ * but there's nothing we can do about it now.  These ioctls are only
+ * supported on the MPC5121.
+ */
+#define MFB_SET_GAMMA           _IOW('M', 1, __u8)
+#define MFB_GET_GAMMA           _IOR('M', 1, __u8)
+
+/*
  * The original definitions of MFB_SET_PIXFMT and MFB_GET_PIXFMT used the
  * wrong value for 'size' field of the ioctl.  The current macros above use the
  * right size, but we still need to provide backwards compatibility, at least