From cfd5d09691ee188a36c00f5c3b220fbf082a78d7 Mon Sep 17 00:00:00 2001 From: Markus Pargmann Date: Sat, 9 Mar 2013 15:19:56 -0800 Subject: [PATCH] Input: wm97xx - drop out of range inputs With fast movements, there occured some out of screen jumps with my touchscreen. The abs_x and abs_y module parameters should fix this by default, but the driver doesn't actively checks the x/y coordinates. Instead it seems that the input layer was supposed to drop out of range inputs, as described in the comments: "These parameters are used to help the input layer discard out of range readings and reduce jitter etc" The input layer documentation describes that values that are not in the absolute range are also accepted. So this patch adds a check within the driver. Signed-off-by: Markus Pargmann Acked-by: Mark Brown Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/wm97xx-core.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/input/touchscreen/wm97xx-core.c b/drivers/input/touchscreen/wm97xx-core.c index 5dbe73af2f8f..7e45c9f6e6b7 100644 --- a/drivers/input/touchscreen/wm97xx-core.c +++ b/drivers/input/touchscreen/wm97xx-core.c @@ -442,6 +442,16 @@ static int wm97xx_read_samples(struct wm97xx *wm) "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n", data.x >> 12, data.x & 0xfff, data.y >> 12, data.y & 0xfff, data.p >> 12, data.p & 0xfff); + + if (abs_x[0] > (data.x & 0xfff) || + abs_x[1] < (data.x & 0xfff) || + abs_y[0] > (data.y & 0xfff) || + abs_y[1] < (data.y & 0xfff)) { + dev_dbg(wm->dev, "Measurement out of range, dropping it\n"); + rc = RC_AGAIN; + goto out; + } + input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff); input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff); input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff); @@ -455,6 +465,7 @@ static int wm97xx_read_samples(struct wm97xx *wm) wm->ts_reader_interval = wm->ts_reader_min_interval; } +out: mutex_unlock(&wm->codec_mutex); return rc; } -- 2.30.2