diff options
Diffstat (limited to 'drivers/usb/input/hid-core.c')
| -rw-r--r-- | drivers/usb/input/hid-core.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/drivers/usb/input/hid-core.c b/drivers/usb/input/hid-core.c index a6738a83ff5..feabda73a6f 100644 --- a/drivers/usb/input/hid-core.c +++ b/drivers/usb/input/hid-core.c @@ -750,21 +750,31 @@ static __inline__ __u32 s32ton(__s32 value, unsigned n) } /* - * Extract/implement a data field from/to a report. + * Extract/implement a data field from/to a little endian report (bit array). */ static __inline__ __u32 extract(__u8 *report, unsigned offset, unsigned n) { - report += (offset >> 5) << 2; offset &= 31; - return (le64_to_cpu(get_unaligned((__le64*)report)) >> offset) & ((1ULL << n) - 1); + u32 x; + + report += offset >> 3; /* adjust byte index */ + offset &= 8 - 1; + x = get_unaligned((u32 *) report); + x = le32_to_cpu(x); + x = (x >> offset) & ((1 << n) - 1); + return x; } static __inline__ void implement(__u8 *report, unsigned offset, unsigned n, __u32 value) { - report += (offset >> 5) << 2; offset &= 31; - put_unaligned((get_unaligned((__le64*)report) - & cpu_to_le64(~((((__u64) 1 << n) - 1) << offset))) - | cpu_to_le64((__u64)value << offset), (__le64*)report); + u32 x; + + report += offset >> 3; + offset &= 8 - 1; + x = get_unaligned((u32 *)report); + x &= cpu_to_le32(~((((__u32) 1 << n) - 1) << offset)); + x |= cpu_to_le32(value << offset); + put_unaligned(x,(u32 *)report); } /* |