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[109.252.193.52]) by smtp.gmail.com with ESMTPSA id g10sm1725052lfe.90.2021.03.02.02.08.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Mar 2021 02:08:34 -0800 (PST) From: Dmitry Osipenko To: Dmitry Torokhov , =?utf-8?q?Micha=C5=82_Mir?= =?utf-8?b?b3PFgmF3?= , Johnny Chuang , Jasper Korten , Svyatoslav Ryhel Cc: linux-input@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v1] Input: elants_i2c - fix division by zero if firmware reports zero phys size Date: Tue, 2 Mar 2021 13:08:24 +0300 Message-Id: <20210302100824.3423-1-digetx@gmail.com> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Touchscreen firmware of ASUS Transformer TF700T reports zeros for the phys size. Hence check whether the size is zero and don't set the resolution in this case. Reported-by: Jasper Korten Signed-off-by: Dmitry Osipenko --- Please note that ASUS TF700T isn't yet supported by upstream kernel, hence this is not a critical fix. drivers/input/touchscreen/elants_i2c.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c index 4c2b579f6c8b..a2e1cc4192b0 100644 --- a/drivers/input/touchscreen/elants_i2c.c +++ b/drivers/input/touchscreen/elants_i2c.c @@ -1441,14 +1441,16 @@ static int elants_i2c_probe(struct i2c_client *client, touchscreen_parse_properties(ts->input, true, &ts->prop); - if (ts->chip_id == EKTF3624) { + if (ts->chip_id == EKTF3624 && ts->phy_x && ts->phy_y) { /* calculate resolution from size */ ts->x_res = DIV_ROUND_CLOSEST(ts->prop.max_x, ts->phy_x); ts->y_res = DIV_ROUND_CLOSEST(ts->prop.max_y, ts->phy_y); } - input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res); - input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res); + if (ts->x_res > 0) + input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res); + if (ts->y_res > 0) + input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res); if (ts->major_res > 0) input_abs_set_res(ts->input, ABS_MT_TOUCH_MAJOR, ts->major_res);