[PATCH v3 15/16] Input: joystick - Replace open-coded parity calculation with parity64()
Kuan-Wei Chiu <[email protected]>
| Newsgroups | dev.linux.lists.brcm80211,org.freedesktop.lists.dri-devel,org.infradead.lists.linux-mtd,org.kernel.vger.bpf,org.kernel.vger.linux-input,org.kernel.vger.linux-kernel,org.kernel.vger.linux-media,org.kernel.vger.linux-serial,org.kernel.vger.linux-wireless,org.kernel.vger.netdev |
|---|---|
| Message-ID | <[email protected]> |
Refactor parity calculations to use the standard parity64() helper. This change eliminates redundant implementations and improves code efficiency. Co-developed-by: Yu-Chun Lin <[email protected]> Signed-off-by: Yu-Chun Lin <[email protected]> Signed-off-by: Kuan-Wei Chiu <[email protected]> --- drivers/input/joystick/sidewinder.c | 24 +++++------------------- 1 file changed, 5 insertions(+), 19 deletions(-) diff --git a/drivers/input/joystick/sidewinder.c b/drivers/input/joystick/sidewinder.c index 3a5873e5fcb3..9fe980096f70 100644 --- a/drivers/input/joystick/sidewinder.c +++ b/drivers/input/joystick/sidewinder.c @@ -7,6 +7,7 @@ * Microsoft SideWinder joystick family driver for Linux */ +#include <linux/bitops.h> #include <linux/delay.h> #include <linux/kernel.h> #include <linux/module.h> @@ -240,21 +241,6 @@ static void sw_init_digital(struct gameport *gameport) local_irq_restore(flags); } -/* - * sw_parity() computes parity of __u64 - */ - -static int sw_parity(__u64 t) -{ - int x = t ^ (t >> 32); - - x ^= x >> 16; - x ^= x >> 8; - x ^= x >> 4; - x ^= x >> 2; - x ^= x >> 1; - return x & 1; -} /* * sw_ccheck() checks synchronization bits and computes checksum of nibbles. @@ -316,7 +302,7 @@ static int sw_parse(unsigned char *buf, struct sw *sw) for (i = 0; i < sw->number; i ++) { - if (sw_parity(GB(i*15,15))) + if (parity64(GB(i*15,15))) return -1; input_report_abs(sw->dev[i], ABS_X, GB(i*15+3,1) - GB(i*15+2,1)); @@ -333,7 +319,7 @@ static int sw_parse(unsigned char *buf, struct sw *sw) case SW_ID_PP: case SW_ID_FFP: - if (!sw_parity(GB(0,48)) || (hat = GB(42,4)) > 8) + if (!parity64(GB(0,48)) || (hat = GB(42,4)) > 8) return -1; dev = sw->dev[0]; @@ -354,7 +340,7 @@ static int sw_parse(unsigned char *buf, struct sw *sw) case SW_ID_FSP: - if (!sw_parity(GB(0,43)) || (hat = GB(28,4)) > 8) + if (!parity64(GB(0,43)) || (hat = GB(28,4)) > 8) return -1; dev = sw->dev[0]; @@ -379,7 +365,7 @@ static int sw_parse(unsigned char *buf, struct sw *sw) case SW_ID_FFW: - if (!sw_parity(GB(0,33))) + if (!parity64(GB(0,33))) return -1; dev = sw->dev[0]; -- 2.34.1