From 3aceaa34d7723c2556555b05ad04a89ce2d66374 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Thu, 4 Jan 2018 22:52:55 -0800 Subject: Input: trackpoint - combine calls to ps2_command() We do not need to call ps2_command() several times in a row, transmitting every byte as it were a command byte, we can often pack it all in a single command. Also, now that ps2_command() handles retransmission, we do not need to do it ourselves in trackpoint_power_on_reset(). Signed-off-by: Dmitry Torokhov --- drivers/input/mouse/trackpoint.c | 60 ++++++++++++++++------------------------ 1 file changed, 24 insertions(+), 36 deletions(-) (limited to 'drivers/input') diff --git a/drivers/input/mouse/trackpoint.c b/drivers/input/mouse/trackpoint.c index bbd2922..6590d10 100644 --- a/drivers/input/mouse/trackpoint.c +++ b/drivers/input/mouse/trackpoint.c @@ -33,18 +33,15 @@ static const char * const trackpoint_variants[] = { */ static int trackpoint_power_on_reset(struct ps2dev *ps2dev) { - u8 results[2]; - int tries = 0; + u8 param[2] = { TP_POR }; + int err; - /* Issue POR command, and repeat up to once if 0xFC00 received */ - do { - if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) || - ps2_command(ps2dev, results, MAKE_PS2_CMD(0, 2, TP_POR))) - return -1; - } while (results[0] == 0xFC && results[1] == 0x00 && ++tries < 2); + err = ps2_command(ps2dev, param, MAKE_PS2_CMD(1, 2, TP_COMMAND)); + if (err) + return err; /* Check for success response -- 0xAA00 */ - if (results[0] != 0xAA || results[1] != 0x00) + if (param[0] != 0xAA || param[1] != 0x00) return -ENODEV; return 0; @@ -55,49 +52,39 @@ static int trackpoint_power_on_reset(struct ps2dev *ps2dev) */ static int trackpoint_read(struct ps2dev *ps2dev, u8 loc, u8 *results) { - if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) || - ps2_command(ps2dev, results, MAKE_PS2_CMD(0, 1, loc))) { - return -1; - } + results[0] = loc; - return 0; + return ps2_command(ps2dev, results, MAKE_PS2_CMD(1, 1, TP_COMMAND)); } static int trackpoint_write(struct ps2dev *ps2dev, u8 loc, u8 val) { - if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) || - ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_WRITE_MEM)) || - ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, loc)) || - ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, val))) { - return -1; - } + u8 param[3] = { TP_WRITE_MEM, loc, val }; - return 0; + return ps2_command(ps2dev, param, MAKE_PS2_CMD(3, 0, TP_COMMAND)); } static int trackpoint_toggle_bit(struct ps2dev *ps2dev, u8 loc, u8 mask) { + u8 param[3] = { TP_TOGGLE, loc, mask }; + /* Bad things will happen if the loc param isn't in this range */ if (loc < 0x20 || loc >= 0x2F) - return -1; - - if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) || - ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_TOGGLE)) || - ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, loc)) || - ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, mask))) { - return -1; - } + return -EINVAL; - return 0; + return ps2_command(ps2dev, param, MAKE_PS2_CMD(3, 0, TP_COMMAND)); } static int trackpoint_update_bit(struct ps2dev *ps2dev, u8 loc, u8 mask, u8 value) { - int retval = 0; + int retval; u8 data; - trackpoint_read(ps2dev, loc, &data); + retval = trackpoint_read(ps2dev, loc, &data); + if (retval) + return retval; + if (((data & mask) == mask) != !!value) retval = trackpoint_toggle_bit(ps2dev, loc, mask); @@ -142,9 +129,9 @@ static ssize_t trackpoint_set_int_attr(struct psmouse *psmouse, void *data, return err; *field = value; - trackpoint_write(&psmouse->ps2dev, attr->command, value); + err = trackpoint_write(&psmouse->ps2dev, attr->command, value); - return count; + return err ?: count; } #define TRACKPOINT_INT_ATTR(_name, _command, _default) \ @@ -175,10 +162,11 @@ static ssize_t trackpoint_set_bit_attr(struct psmouse *psmouse, void *data, if (*field != value) { *field = value; - trackpoint_toggle_bit(&psmouse->ps2dev, attr->command, attr->mask); + err = trackpoint_toggle_bit(&psmouse->ps2dev, + attr->command, attr->mask); } - return count; + return err ?: count; } -- cgit v1.1