From a839cd579b64e41779a24c691d0c88c6a16c63e0 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Wed, 20 May 2015 14:39:21 -0700 Subject: [PATCH] Input: alps - only set fields that are actually present Pinnacle / Rushmore packets contain either position info, or bitmap info, never both. So far we've in essence been storing garbage in the position / bitmap fields of the fields struct when decoding a bitmap / pos packet. We've been relying on the following sequence to get away with this: 1) Decode bitmap packet 2) Process bitmap packet 3) Decode position packet 4) Use position / button info This patch allows us to change this sequence, which will allow using the position info when processing the bitmap for more accurate results. Signed-off-by: Hans de Goede Signed-off-by: Dmitry Torokhov --- drivers/input/mouse/alps.c | 62 ++++++++++++++++++++------------------ 1 file changed, 33 insertions(+), 29 deletions(-) diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c index f4ba73b81d31..942ee08ce6b4 100644 --- a/drivers/input/mouse/alps.c +++ b/drivers/input/mouse/alps.c @@ -576,20 +576,22 @@ static int alps_decode_pinnacle(struct alps_fields *f, unsigned char *p, f->first_mp = !!(p[4] & 0x40); f->is_mp = !!(p[0] & 0x40); - f->fingers = (p[5] & 0x3) + 1; - f->x_map = ((p[4] & 0x7e) << 8) | - ((p[1] & 0x7f) << 2) | - ((p[0] & 0x30) >> 4); - f->y_map = ((p[3] & 0x70) << 4) | - ((p[2] & 0x7f) << 1) | - (p[4] & 0x01); - - f->st.x = ((p[1] & 0x7f) << 4) | ((p[4] & 0x30) >> 2) | - ((p[0] & 0x30) >> 4); - f->st.y = ((p[2] & 0x7f) << 4) | (p[4] & 0x0f); - f->pressure = p[5] & 0x7f; + if (f->is_mp) { + f->fingers = (p[5] & 0x3) + 1; + f->x_map = ((p[4] & 0x7e) << 8) | + ((p[1] & 0x7f) << 2) | + ((p[0] & 0x30) >> 4); + f->y_map = ((p[3] & 0x70) << 4) | + ((p[2] & 0x7f) << 1) | + (p[4] & 0x01); + } else { + f->st.x = ((p[1] & 0x7f) << 4) | ((p[4] & 0x30) >> 2) | + ((p[0] & 0x30) >> 4); + f->st.y = ((p[2] & 0x7f) << 4) | (p[4] & 0x0f); + f->pressure = p[5] & 0x7f; - alps_decode_buttons_v3(f, p); + alps_decode_buttons_v3(f, p); + } return 0; } @@ -600,22 +602,24 @@ static int alps_decode_rushmore(struct alps_fields *f, unsigned char *p, f->first_mp = !!(p[4] & 0x40); f->is_mp = !!(p[5] & 0x40); - f->fingers = max((p[5] & 0x3), ((p[5] >> 2) & 0x3)) + 1; - f->x_map = ((p[5] & 0x10) << 11) | - ((p[4] & 0x7e) << 8) | - ((p[1] & 0x7f) << 2) | - ((p[0] & 0x30) >> 4); - f->y_map = ((p[5] & 0x20) << 6) | - ((p[3] & 0x70) << 4) | - ((p[2] & 0x7f) << 1) | - (p[4] & 0x01); - - f->st.x = ((p[1] & 0x7f) << 4) | ((p[4] & 0x30) >> 2) | - ((p[0] & 0x30) >> 4); - f->st.y = ((p[2] & 0x7f) << 4) | (p[4] & 0x0f); - f->pressure = p[5] & 0x7f; - - alps_decode_buttons_v3(f, p); + if (f->is_mp) { + f->fingers = max((p[5] & 0x3), ((p[5] >> 2) & 0x3)) + 1; + f->x_map = ((p[5] & 0x10) << 11) | + ((p[4] & 0x7e) << 8) | + ((p[1] & 0x7f) << 2) | + ((p[0] & 0x30) >> 4); + f->y_map = ((p[5] & 0x20) << 6) | + ((p[3] & 0x70) << 4) | + ((p[2] & 0x7f) << 1) | + (p[4] & 0x01); + } else { + f->st.x = ((p[1] & 0x7f) << 4) | ((p[4] & 0x30) >> 2) | + ((p[0] & 0x30) >> 4); + f->st.y = ((p[2] & 0x7f) << 4) | (p[4] & 0x0f); + f->pressure = p[5] & 0x7f; + + alps_decode_buttons_v3(f, p); + } return 0; } -- 2.20.1