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Work around missing EVIOCGMTSLOTS ioctl

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Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer 2013-10-08 14:21:14 +10:00
parent ae738d29ea
commit 306f856f67
1 changed files with 12 additions and 2 deletions
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14
libevdev/libevdev.c
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@ -498,11 +498,14 @@ sync_mt_state(struct libevdev *dev, int create_events)
{
int rc;
int i;
int ioctl_success = 0;
struct mt_state {
int code;
int val[MAX_SLOTS];
} mt_state[ABS_MT_CNT];
memset(&mt_state, 0, sizeof(mt_state));
for (i = ABS_MT_MIN; i <= ABS_MT_MAX; i++) {
int idx;
if (i == ABS_MT_SLOT)
@ -514,8 +517,15 @@ sync_mt_state(struct libevdev *dev, int create_events)
idx = i - ABS_MT_MIN;
mt_state[idx].code = i;
rc = ioctl(dev->fd, EVIOCGMTSLOTS(sizeof(struct mt_state)), &mt_state[idx]);
if (rc < 0)
goto out;
if (rc < 0) {
/* if the first ioctl fails with -EINVAL, chances are the kernel
doesn't support the ioctl. Simply continue */
if (errno == -EINVAL && !ioctl_success) {
rc = 0;
} else /* if the second, ... ioctl fails, really fail */
goto out;
} else if (ioctl_success == 0)
ioctl_success = 1;
}
for (i = 0; i < dev->num_slots; i++) {