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Input: sur40 - add additional reverse-engineered information

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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>
This commit is contained in:
Florian Echtler 2017-07-10 10:39:27 -07:00 committed by Dmitry Torokhov
parent 9e938decea
commit 435915eae2
1 changed files with 12 additions and 5 deletions
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17
drivers/input/touchscreen/sur40.c
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@ -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;