From b584efc9ea7575d3235cfd745e8a28201d2c37f6 Mon Sep 17 00:00:00 2001 From: Michael Hennerich Date: Thu, 28 Oct 2010 14:59:05 -0700 Subject: [PATCH 1/3] Input: ad7879 - prevent invalid finger data reports Considering following scenario - the touch is present on the screen at the beginning of the last conversion sequence, but by the time the last sequence is finished, the finger is lift off. The AD7879 data available interrupt signals (DAV) completion, however some X,Y values are not valid because the screen inputs were floating during the acquisition. The AD7877 acts differently here, since it only asserts DAV if the touch is still present when the conversion sequence finished. Based on the fact that this can only happen in the last sample of the repeated conversion sequence, we simply skip the last (short glitches are filtered by the AD7879 internal median and average filters). This doesn't cause noticeable side effects, since the minimum conversion interval is 9.44ms. We receive ~100 waypoint samples per second, so we simply delay the result by 9.44ms. We also reject samples where pressure is greater than pressure_max. Signed-off-by: Michael Hennerich Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/ad7879.c | 34 ++++++++++++++++++++++++------ 1 file changed, 28 insertions(+), 6 deletions(-) diff --git a/drivers/input/touchscreen/ad7879.c b/drivers/input/touchscreen/ad7879.c index ba6f0bd1e762..bc3b5187f3a3 100644 --- a/drivers/input/touchscreen/ad7879.c +++ b/drivers/input/touchscreen/ad7879.c @@ -129,6 +129,9 @@ struct ad7879 { u16 cmd_crtl1; u16 cmd_crtl2; u16 cmd_crtl3; + int x; + int y; + int Rt; }; static int ad7879_read(struct ad7879 *ts, u8 reg) @@ -175,13 +178,32 @@ static int ad7879_report(struct ad7879 *ts) Rt /= z1; Rt = (Rt + 2047) >> 12; - if (!timer_pending(&ts->timer)) - input_report_key(input_dev, BTN_TOUCH, 1); + /* + * Sample found inconsistent, pressure is beyond + * the maximum. Don't report it to user space. + */ + if (Rt > ts->pressure_max) + return -EINVAL; + + /* + * Note that we delay reporting events by one sample. + * This is done to avoid reporting last sample of the + * touch sequence, which may be incomplete if finger + * leaves the surface before last reading is taken. + */ + if (timer_pending(&ts->timer)) { + /* Touch continues */ + input_report_key(input_dev, BTN_TOUCH, 1); + input_report_abs(input_dev, ABS_X, ts->x); + input_report_abs(input_dev, ABS_Y, ts->y); + input_report_abs(input_dev, ABS_PRESSURE, ts->Rt); + input_sync(input_dev); + } + + ts->x = x; + ts->y = y; + ts->Rt = Rt; - input_report_abs(input_dev, ABS_X, x); - input_report_abs(input_dev, ABS_Y, y); - input_report_abs(input_dev, ABS_PRESSURE, Rt); - input_sync(input_dev); return 0; } From bac64d0f8cfd45f1027b6e946785a56e8d694fba Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Thu, 28 Oct 2010 15:09:28 -0700 Subject: [PATCH 2/3] Input: bu21013_ts - fix null dereference in error handling bu21013_data could be NULL so better not reference it. Signed-off-by: Dan Carpenter Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/bu21013_ts.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/input/touchscreen/bu21013_ts.c b/drivers/input/touchscreen/bu21013_ts.c index ccde58602563..2ca9e5d66460 100644 --- a/drivers/input/touchscreen/bu21013_ts.c +++ b/drivers/input/touchscreen/bu21013_ts.c @@ -514,7 +514,7 @@ static int __devinit bu21013_probe(struct i2c_client *client, err_cs_disable: pdata->cs_dis(pdata->cs_pin); err_free_mem: - input_free_device(bu21013_data->in_dev); + input_free_device(in_dev); kfree(bu21013_data); return error; From d745b5326dd1960bf1d9ce2cb8408561a81a7271 Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Sat, 30 Oct 2010 17:19:49 -0700 Subject: [PATCH 3/3] Input: appletouch - remove extra KERN_DEBUG use from dprintk Signed-off-by: Joe Perches Signed-off-by: Dmitry Torokhov --- drivers/input/mouse/appletouch.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/input/mouse/appletouch.c b/drivers/input/mouse/appletouch.c index a9cf76831634..b77f9991278e 100644 --- a/drivers/input/mouse/appletouch.c +++ b/drivers/input/mouse/appletouch.c @@ -630,7 +630,7 @@ static void atp_complete_geyser_3_4(struct urb *urb) /* Just update the base values (i.e. touchpad in untouched state) */ if (dev->data[dev->info->datalen - 1] & ATP_STATUS_BASE_UPDATE) { - dprintk(KERN_DEBUG "appletouch: updated base values\n"); + dprintk("appletouch: updated base values\n"); memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old)); goto exit;