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Fix invalid absinfo range values reported by certain mtk soc

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This change will only affect certain touch screens, for which the driver
integration code does not provide meaningful values for the allowed range
of ABS_MT_TRACKING_IDs. The reported range [0, 0] will be overwritten with
[-1, 0xFFFF]

Signed-off-by: Andreas Pokorny <andreas.pokorny@canonical.com>

[Changed from INT_MAX to 0xFFFF to match the kernel, add device name to log
message]

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Andreas Pokorny 2015-08-23 18:27:28 +02:00 • committed by Peter Hutterer
parent fa3c5622de
commit 0028174c0b
1 changed files with 23 additions and 0 deletions
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23
libevdev/libevdev.c
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@ -25,6 +25,7 @@
#include <poll.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <unistd.h>
#include <stdarg.h>
#include <stdbool.h>
@ -126,6 +127,26 @@ libevdev_dflt_log_func(enum libevdev_log_priority priority,
vfprintf(stderr, format, args);
}
static void
fix_invalid_absinfo(const struct libevdev *dev,
int axis,
struct input_absinfo* abs_info)
{
/*
* The reported absinfo for ABS_MT_TRACKING_ID is sometimes
* uninitialized for certain mtk-soc, due to init code mangling
* in the vendor kernel.
*/
if (axis == ABS_MT_TRACKING_ID &&
abs_info->maximum == abs_info->minimum) {
abs_info->minimum = -1;
abs_info->maximum = 0xFFFF;
log_bug(dev,
"Device \"%s\" has invalid ABS_MT_TRACKING_ID range",
dev->name);
}
}
/*
* Global logging settings.
*/
@ -431,6 +452,8 @@ libevdev_set_fd(struct libevdev* dev, int fd)
if (rc < 0)
goto out;
fix_invalid_absinfo(dev, i, &abs_info);
dev->abs_info[i] = abs_info;
}
}