V4L/DVB (5306): Add support for VIDIOC_G_CHIP_IDENT

VIDIOC_G_CHIP_IDENT improves debugging of card problems: it can be
used to detect which chips are on the board and based on that information
selected register dumps can be made, making it easy to debug complicated
media chips containing tens or hundreds of registers.
This ioctl replaces the internal VIDIOC_INT_G_CHIP_IDENT ioctl.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

2 files changed, 7 insertions, 5 deletions

diff --git a/drivers/media/video/cx25840/cx25840-core.c b/drivers/media/video/cx25840/cx25840-core.c
index 774d2536555b..1757a588970f 100644
--- a/drivers/media/video/cx25840/cx25840-core.c
+++ b/drivers/media/video/cx25840/cx25840-core.c
@@ -35,6 +35,7 @@
 #include <linux/videodev2.h>
 #include <linux/i2c.h>
 #include <media/v4l2-common.h>
+#include <media/v4l2-chip-ident.h>
 #include <media/cx25840.h>
 
 #include "cx25840-core.h"
@@ -827,9 +828,8 @@ static int cx25840_command(struct i2c_client *client, unsigned int cmd,
                         cx25840_initialize(client, 0);
                 break;
 
-        case VIDIOC_INT_G_CHIP_IDENT:
-                *(enum v4l2_chip_ident *)arg = state->id;
-                break;
+        case VIDIOC_G_CHIP_IDENT:
+                return v4l2_chip_ident_i2c_client(client, arg, state->id, state->rev);
 
         default:
                 return -EINVAL;
@@ -847,7 +847,7 @@ static int cx25840_detect_client(struct i2c_adapter *adapter, int address,
 {
         struct i2c_client *client;
         struct cx25840_state *state;
-        enum v4l2_chip_ident id;
+        u32 id;
         u16 device_id;
 
         /* Check if the adapter supports the needed features
@@ -902,6 +902,7 @@ static int cx25840_detect_client(struct i2c_adapter *adapter, int address,
         state->audmode = V4L2_TUNER_MODE_LANG1;
         state->vbi_line_offset = 8;
         state->id = id;
+        state->rev = device_id;
 
         i2c_attach_client(client);
 
diff --git a/drivers/media/video/cx25840/cx25840-core.h b/drivers/media/video/cx25840/cx25840-core.h
index 28049064dd7d..f4b56d2fd6b6 100644
--- a/drivers/media/video/cx25840/cx25840-core.h
+++ b/drivers/media/video/cx25840/cx25840-core.h
@@ -43,7 +43,8 @@ struct cx25840_state {
         u32 audclk_freq;
         int audmode;
         int vbi_line_offset;
-        enum v4l2_chip_ident id;
+        u32 id;
+        u32 rev;
         int is_cx25836;
 };