2018-02-06 2:20 GMT+01:00 Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>:
> On Mon, Feb 05, 2018 at 11:07:08AM +0100, Christian Gmeiner wrote:
>> Hi all.
>>
>> 2017-04-27 14:22 GMT+02:00 Martin Kepplinger <martin.kepplinger@xxxxxxxxxxxxx>:
>> > The device could as well be in command mode, in which this driver cannot
>> > handle the device. When opening the device, let's make sure the device
>> > will be in the mode we expect it to be for this driver.
>> >
>>
>> I run into issues caused by this change. It turns out that the device
>> is non-functional
>> after some warm-reboots and as a result I am not able to use xorg's
>> evdev driver.
>> So I have some questions about this change:
>>
>> * Should we enable irq before calling i2c_master_send(..) as the chip raises an
>> irq if the command was processed?
>
> Well, we do not care about the response... However, what is your
> interrupt trigger settings? Are you using edge by chance? If so, please
> try switching to level.
>
We may should take care of the response. I have seen strange responses
after the third open of the device.
&i2c2 {
ar1021@4d {
compatible = "microchip,ar1021-i2c";
reg = <0x4d>;
interrupt-parent = <&gpio3>;
interrupts = <26 IRQ_TYPE_EDGE_RISING>;
};
};
I am not sure if this is really the cause of the problem! As without this commit
my device survives one week of a automated touch-press-test done with some
mechanical gear and with the help of an SPS.
>>
>> * Would it be enough to send this command only once during driver
>> lifetime? I can
>> see that on my system open gets called 3 times during boot-up.
>>
>> * What are the circumstances the touch device would be in an other state? In the
>> official kernel driver the userspace can send commands via sysfs.
>> Also the driver
>> does set the touch enable mode as this patch does.
>
> What is "the official kernel driver"?
>
http://ww1.microchip.com/downloads/en/DeviceDoc/AR1020-AR1021-LINUX-SPI-I2C-V102.tar.gz
As it is release time at my company I had to stop finding the root
cause but will look into the issue
again in 2-3 weeks.
--
greets
--
Christian Gmeiner, MSc
https://christian-gmeiner.info
--
To unsubscribe from this list: send the line "unsubscribe linux-input" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
