V4L/DVB (7160): em28xx: Allow register dump/setting for debug

Adds vidioc_[g|s]_register handlers. This allows getting/setting register
from em28xx.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 66 insertions, 0 deletions

diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
index c4126055bec3..4c836ad5cf41 100644
--- a/drivers/media/video/em28xx/em28xx-video.c
+++ b/drivers/media/video/em28xx/em28xx-video.c
@@ -830,6 +830,64 @@ static int vidioc_s_frequency(struct file *file, void *priv,
         return 0;
 }
 
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int em28xx_reg_len(int reg)
+{
+        switch (reg) {
+        case AC97LSB_REG:
+        case HSCALELOW_REG:
+        case VSCALELOW_REG:
+
+                return 2;
+        default:
+                return 1;
+        }
+}
+
+static int vidioc_g_register(struct file *file, void *priv,
+                             struct v4l2_register *reg)
+{
+        struct em28xx_fh      *fh  = priv;
+        struct em28xx         *dev = fh->dev;
+        int ret;
+
+        if (!v4l2_chip_match_host(reg->match_type, reg->match_chip))
+                return -EINVAL;
+
+        if (em28xx_reg_len(reg->reg) == 1) {
+                ret = em28xx_read_reg(dev, reg->reg);
+                if (ret < 0)
+                        return ret;
+
+                reg->val = ret;
+        } else {
+                u16 val;
+                ret = em28xx_read_reg_req_len(dev, USB_REQ_GET_STATUS,
+                                                   reg->reg, (char *)&val, 2);
+                if (ret < 0)
+                        return ret;
+
+                reg->val = val;
+        }
+
+        return 0;
+}
+
+static int vidioc_s_register(struct file *file, void *priv,
+                             struct v4l2_register *reg)
+{
+        struct em28xx_fh      *fh  = priv;
+        struct em28xx         *dev = fh->dev;
+        u16 buf;
+
+        buf = be16_to_cpu((__u16)reg->val);
+
+        return em28xx_write_regs(dev, reg->reg, (char *)&buf,
+                                 em28xx_reg_len(reg->reg));
+}
+#endif
+
+
 static int vidioc_cropcap(struct file *file, void *priv,
                                         struct v4l2_cropcap *cc)
 {
@@ -1730,6 +1788,10 @@ static const struct video_device em28xx_video_template = {
         .vidioc_s_tuner             = vidioc_s_tuner,
         .vidioc_g_frequency         = vidioc_g_frequency,
         .vidioc_s_frequency         = vidioc_s_frequency,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+        .vidioc_g_register          = vidioc_g_register,
+        .vidioc_s_register          = vidioc_s_register,
+#endif
 
         .tvnorms                    = V4L2_STD_ALL,
         .current_norm               = V4L2_STD_PAL,
@@ -1752,6 +1814,10 @@ static struct video_device em28xx_radio_template = {
         .vidioc_s_ctrl        = vidioc_s_ctrl,
         .vidioc_g_frequency   = vidioc_g_frequency,
         .vidioc_s_frequency   = vidioc_s_frequency,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+        .vidioc_g_register    = vidioc_g_register,
+        .vidioc_s_register    = vidioc_s_register,
+#endif
 };
 
 /******************************** usb interface *****************************************/