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From:   Benjamin Bara <bbara93@gmail.com>
Date:   Thu, 27 Jul 2023 17:19:57 +0200
Subject: [PATCH] Input: ads7846 - don't set ABS_PRESSURE when min == max
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Message-Id: <20230727-ads7846-pressure-v1-1-fa74c7680191@skidata.com>
To:     Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc:     linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
        Benjamin Bara <benjamin.bara@skidata.com>
Precedence: bulk

From: Benjamin Bara <benjamin.bara@skidata.com>

When the optional fields "pressure_min" and "pressure_max" are not set,
both fall back to 0, which results to the following libinput error:

ADS7846 Touchscreen: kernel bug: device has min == max on ABS_PRESSURE

Avoid it by only setting ABS_PRESSURE if the values differ.

Signed-off-by: Benjamin Bara <benjamin.bara@skidata.com>
---
 drivers/input/touchscreen/ads7846.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index faea40dd66d0..2535424a5630 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -1281,7 +1281,7 @@ static int ads7846_probe(struct spi_device *spi)
 			pdata->y_min ? : 0,
 			pdata->y_max ? : MAX_12BIT,
 			0, 0);
-	if (ts->model != 7845)
+	if (ts->model != 7845 && pdata->pressure_min != pdata->pressure_max)
 		input_set_abs_params(input_dev, ABS_PRESSURE,
 				pdata->pressure_min, pdata->pressure_max, 0, 0);
 

---
base-commit: 451cc82bd11eb6a374f4dbcfc1cf007eafea91ab
change-id: 20230727-ads7846-pressure-05edfb01887f

Best regards,
-- 
Benjamin Bara <benjamin.bara@skidata.com>