From: Dmitry Torokhov When calculating deltas for touchpads that generate absolute events use average over the last 3 packets to remove jitter drivers/input/mouse/synaptics.c | 11 +++-- drivers/input/mousedev.c | 84 +++++++++++++++++++++++----------------- 2 files changed, 56 insertions(+), 39 deletions(-) diff -puN drivers/input/mousedev.c~input-mousedev-remove-jitter drivers/input/mousedev.c --- 25/drivers/input/mousedev.c~input-mousedev-remove-jitter 2003-12-25 01:30:48.000000000 -0800 +++ 25-akpm/drivers/input/mousedev.c 2003-12-25 01:30:48.000000000 -0800 @@ -53,12 +53,14 @@ struct mousedev_list { struct fasync_struct *fasync; struct mousedev *mousedev; struct list_head node; - int dx, dy, dz, oldx, oldy; - signed char ps2[6]; + int dx, dy, dz; + int old_x[4], old_y[4]; unsigned long buttons; + signed char ps2[6]; unsigned char ready, buffer, bufsiz; unsigned char mode, imexseq, impsseq; - int finger; + unsigned int pkt_count; + unsigned char touch; }; #define MOUSEDEV_SEQ_LEN 6 @@ -74,49 +76,49 @@ static struct mousedev mousedev_mix; static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X; static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y; +#define fx(i) (list->old_x[(list->pkt_count - (i)) & 03]) +#define fy(i) (list->old_y[(list->pkt_count - (i)) & 03]) + static void mousedev_abs_event(struct input_handle *handle, struct mousedev_list *list, unsigned int code, int value) { int size; + int touchpad; /* Ignore joysticks */ if (test_bit(BTN_TRIGGER, handle->dev->keybit)) return; - /* Handle touchpad data */ - if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) { - - if (list->finger && list->finger < 3) - list->finger++; - - switch (code) { - case ABS_X: - if (list->finger == 3) - list->dx += (value - list->oldx) / 8; - list->oldx = value; - return; - case ABS_Y: - if (list->finger == 3) - list->dy -= (value - list->oldy) / 8; - list->oldy = value; - return; - } - return; - } + touchpad = test_bit(BTN_TOOL_FINGER, handle->dev->keybit); - /* Handle tablet data */ switch (code) { case ABS_X: - size = handle->dev->absmax[ABS_X] - handle->dev->absmin[ABS_X]; - if (size == 0) size = xres; - list->dx += (value * xres - list->oldx) / size; - list->oldx += list->dx * size; - return; + if (touchpad) { + if (list->touch) { + fx(0) = value; + if (list->pkt_count >= 2) + list->dx = ((fx(0) - fx(1)) / 2 + (fx(1) - fx(2)) / 2) / 8; + } + } else { + size = handle->dev->absmax[ABS_X] - handle->dev->absmin[ABS_X]; + if (size == 0) size = xres; + list->dx += (value * xres - list->old_x[0]) / size; + list->old_x[0] += list->dx * size; + } + break; case ABS_Y: - size = handle->dev->absmax[ABS_Y] - handle->dev->absmin[ABS_Y]; - if (size == 0) size = yres; - list->dy -= (value * yres - list->oldy) / size; - list->oldy -= list->dy * size; - return; + if (touchpad) { + if (list->touch) { + fy(0) = value; + if (list->pkt_count >= 2) + list->dy = -((fy(0) - fy(1)) / 2 + (fy(1) - fy(2)) / 2) / 8; + } + } else { + size = handle->dev->absmax[ABS_Y] - handle->dev->absmin[ABS_Y]; + if (size == 0) size = yres; + list->dy -= (value * yres - list->old_y[0]) / size; + list->old_y[0] -= list->dy * size; + } + break; } } @@ -149,7 +151,9 @@ static void mousedev_event(struct input_ switch (code) { case BTN_TOUCH: /* Handle touchpad data */ if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) { - list->finger = value; + list->touch = value; + if (!list->touch) + list->pkt_count = 0; return; } case BTN_0: @@ -178,6 +182,16 @@ static void mousedev_event(struct input_ case EV_SYN: switch (code) { case SYN_REPORT: + if (list->touch) { + list->pkt_count++; + /* Input system eats duplicate events, + * but we need all of them to do correct + * averaging so apply present one forward + */ + fx(0) = fx(1); + fy(0) = fy(1); + } + list->ready = 1; kill_fasync(&list->fasync, SIGIO, POLL_IN); wake = 1; diff -puN drivers/input/mouse/synaptics.c~input-mousedev-remove-jitter drivers/input/mouse/synaptics.c --- 25/drivers/input/mouse/synaptics.c~input-mousedev-remove-jitter 2003-12-25 01:30:48.000000000 -0800 +++ 25-akpm/drivers/input/mouse/synaptics.c 2003-12-25 01:30:48.000000000 -0800 @@ -553,16 +553,19 @@ static void synaptics_process_packet(str finger_width = 0; } - /* Post events */ + /* Post events + * BTN_TOUCH has to be first as mousedev relies on it when doing + * absolute -> relative conversion + */ + if (hw.z > 30) input_report_key(dev, BTN_TOUCH, 1); + if (hw.z < 25) input_report_key(dev, BTN_TOUCH, 0); + if (hw.z > 0) { input_report_abs(dev, ABS_X, hw.x); input_report_abs(dev, ABS_Y, YMAX_NOMINAL + YMIN_NOMINAL - hw.y); } input_report_abs(dev, ABS_PRESSURE, hw.z); - if (hw.z > 30) input_report_key(dev, BTN_TOUCH, 1); - if (hw.z < 25) input_report_key(dev, BTN_TOUCH, 0); - input_report_abs(dev, ABS_TOOL_WIDTH, finger_width); input_report_key(dev, BTN_TOOL_FINGER, num_fingers == 1); input_report_key(dev, BTN_TOOL_DOUBLETAP, num_fingers == 2); _