ADS7845 doesn't support pressure.
This patch avoids the following error reported by libinput-list-devices:
"ADS7845 Touchscreen: kernel bug: device has min == max on ABS_PRESSURE".

Signed-off-by: Luca Ellero <l.ellero@asem.it>
---
 drivers/input/touchscreen/ads7846.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index bed68a68f330..24605c40d039 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -1316,8 +1316,9 @@ static int ads7846_probe(struct spi_device *spi)
 			pdata->y_min ? : 0,
 			pdata->y_max ? : MAX_12BIT,
 			0, 0);
-	input_set_abs_params(input_dev, ABS_PRESSURE,
-			pdata->pressure_min, pdata->pressure_max, 0, 0);
+	if (ts->model != 7845)
+		input_set_abs_params(input_dev, ABS_PRESSURE,
+				pdata->pressure_min, pdata->pressure_max, 0, 0);
 
 	/*
 	 * Parse common framework properties. Must be done here to ensure the
-- 
2.25.1

On Tue, Nov 29, 2022 at 04:19:57PM +0100, Luca Ellero wrote:
> ADS7845 doesn't support pressure.
> This patch avoids the following error reported by libinput-list-devices:
> "ADS7845 Touchscreen: kernel bug: device has min == max on ABS_PRESSURE".

Fixes tag?

If you run

	git log --no-merges -- drivers/input/touchscreen/ads7846.c

you can get what prefix should be for these patches.

-- 
With Best Regards,
Andy Shevchenko

On 29/11/2022 17:23, Andy Shevchenko wrote:
> On Tue, Nov 29, 2022 at 04:19:57PM +0100, Luca Ellero wrote:
>> ADS7845 doesn't support pressure.
>> This patch avoids the following error reported by libinput-list-devices:
>> "ADS7845 Touchscreen: kernel bug: device has min == max on ABS_PRESSURE".
> 
> Fixes tag?
> 
> If you run
> 
> 	git log --no-merges -- drivers/input/touchscreen/ads7846.c
> 
> you can get what prefix should be for these patches.
> 

Hi Andy,
thank you for your comments.
I will fix the patches and resend.
Regards

-- 
Luca Ellero