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Input: fix force feedback capability query example

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'features' is a bit array, not byte array

Signed-off-by: Alexander Stein <alexander.stein@informatik.tu-chemnitz.de>
Acked-by: Anssi Hannula <anssi.hannula@iki.fi>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Alexander Stein 2011-01-11 01:07:09 -08:00 committed by Dmitry Torokhov
parent 5fca6cac9f
commit e1336bff92
1 changed files with 3 additions and 1 deletions
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4
Documentation/input/ff.txt
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@ -49,7 +49,9 @@ This information is subject to change.
#include <linux/input.h>
#include <sys/ioctl.h>
unsigned long features[1 + FF_MAX/sizeof(unsigned long)];
#define BITS_TO_LONGS(x) \
(((x) + 8 * sizeof (unsigned long) - 1) / (8 * sizeof (unsigned long)))
unsigned long features[BITS_TO_LONGS(FF_CNT)];
int ioctl(int file_descriptor, int request, unsigned long *features);
"request" must be EVIOCGBIT(EV_FF, size of features array in bytes )