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authorFlorian Echtler <floe@butterbrot.org>2017-07-10 20:39:27 +0300
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2017-07-13 00:19:58 +0300
commit435915eae2d796f1141cb1c3280c4388f852bd98 (patch)
tree9bcc569a718213b9ad45a85df3ebfab02e1d35d6 /drivers/input/touchscreen/sur40.c
parent9e938deceaea1496af4dda420e8f854691d4321f (diff)
downloadlinux-435915eae2d796f1141cb1c3280c4388f852bd98.tar.xz
Input: sur40 - add additional reverse-engineered information
Due to recent reverse engineering efforts, a lot more information is now available about the internals of the SUR40. We document this in the kernel driver for future use. Signed-off-by: Martin Kaltenbrunner <modin@yuri.at> Signed-off-by: Florian Echtler <floe@butterbrot.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/touchscreen/sur40.c')
-rw-r--r--drivers/input/touchscreen/sur40.c17
1 files changed, 12 insertions, 5 deletions
diff --git a/drivers/input/touchscreen/sur40.c b/drivers/input/touchscreen/sur40.c
index 128e5bd74720..259aef505042 100644
--- a/drivers/input/touchscreen/sur40.c
+++ b/drivers/input/touchscreen/sur40.c
@@ -59,7 +59,7 @@ struct sur40_blob {
__le16 blob_id;
u8 action; /* 0x02 = enter/exit, 0x03 = update (?) */
- u8 unknown; /* always 0x01 or 0x02 (no idea what this is?) */
+ u8 type; /* bitmask (0x01 blob, 0x02 touch, 0x04 tag) */
__le16 bb_pos_x; /* upper left corner of bounding box */
__le16 bb_pos_y;
@@ -133,12 +133,19 @@ struct sur40_image_header {
/* control commands */
#define SUR40_GET_VERSION 0xb0 /* 12 bytes string */
-#define SUR40_UNKNOWN1 0xb3 /* 5 bytes */
-#define SUR40_UNKNOWN2 0xc1 /* 24 bytes */
+#define SUR40_ACCEL_CAPS 0xb3 /* 5 bytes */
+#define SUR40_SENSOR_CAPS 0xc1 /* 24 bytes */
+
+#define SUR40_POKE 0xc5 /* poke register byte */
+#define SUR40_PEEK 0xc4 /* 48 bytes registers */
#define SUR40_GET_STATE 0xc5 /* 4 bytes state (?) */
#define SUR40_GET_SENSORS 0xb1 /* 8 bytes sensors */
+#define SUR40_BLOB 0x01
+#define SUR40_TOUCH 0x02
+#define SUR40_TAG 0x04
+
static const struct v4l2_pix_format sur40_pix_format[] = {
{
.pixelformat = V4L2_TCH_FMT_TU08,
@@ -238,11 +245,11 @@ static int sur40_init(struct sur40_state *dev)
if (result < 0)
goto error;
- result = sur40_command(dev, SUR40_UNKNOWN2, 0x00, buffer, 24);
+ result = sur40_command(dev, SUR40_SENSOR_CAPS, 0x00, buffer, 24);
if (result < 0)
goto error;
- result = sur40_command(dev, SUR40_UNKNOWN1, 0x00, buffer, 5);
+ result = sur40_command(dev, SUR40_ACCEL_CAPS, 0x00, buffer, 5);
if (result < 0)
goto error;