On 02/06/2012 09:05 AM, Henrik Rydberg wrote:

This patch adds the ability to extract MT slot data via a new ioctl,
EVIOCGMTSLOTS. The function returns an array of slot values for the
specified ABS_MT event type.

Example of user space usage:

struct { unsigned code; int values[64]; } req;
req.code = ABS_MT_POSITION_X;
if (ioctl(fd, EVIOCGMTSLOTS(sizeof(req)), &req) < 0)
	return -1;
for (i = 0; i < 64; i++)
	printf("slot %d: %d\n", i, req.values[i]);

Signed-off-by: Henrik Rydberg <redacted>
---
Here is the fourth version of the patch.

Rather than over-specifying the ioctl binary format by introducing a
struct object that does not fit everyone, this version simply leaves
all object definitions to userland.

This is fine with me. I think the ioctl macro definition would be easier
to work with if it took the number of values instead of the size of the
request, but it's a nit-pick. If Dmitry thinks this is good enough, it's
good enough for me too :).

Reviewed-by: Chase Douglas <redacted>

Thanks!