Continuous Interrupt Problem

[Sarbojit Ganguly]

My apologies as I did not get mail where the problem he faced was resolved.

Anyway, I faced almost similar issue where the problem boiled down to
the flag. So I was kind of interested.



On 14 June 2012 15:09, anish singh <anish198519851985 at gmail.com> wrote:
> On Thu, Jun 14, 2012 at 2:59 PM, Sarbojit Ganguly
> <unixman.linuxboy at gmail.com> wrote:
>> Can you give the hardware details please?
> Sarbojit please don't top post.
> Anyway the problem is resolved as there was no problem in the first place.
> TSP driver is doing i2c-read/write at regular intervals of time in his
> driver and he assumed
> that it should not happen as that would consume power but it is by design.
> Time fires ->workqueue schedule->read i2c/write i2c and report to
> input subsystem.
> He is not having access to the tsp manaul so we don't know why this is
> designed this way.
>>
>> On 14 June 2012 14:35, siddharth saxena <siddharthsaxena1989 at gmail.com> wrote:
>>> Initialized in Probe :
>>>
>>> if (device->irq) {
>>>         ret = request_irq(device->irq, ts_int_handler,
>>>         IRQF_TRIGGER_LOW, DRIVER_NAME, device);
>>>         if (ret) {
>>>             pr_err("unable to register touch irq.(%s)\r\n",
>>>             device->input_dev->name);
>>>             goto err_request_irq;
>>>         }
>>>     }
>>>
>>>
>>>
>>> The pin by default has to be initialized to Active Low.
>>>
>>>
>>>
>>>
>>>
>>> On Thu, Jun 14, 2012 at 2:24 PM, anish singh <anish198519851985 at gmail.com>
>>> wrote:
>>>>
>>>> On Thu, Jun 14, 2012 at 2:11 PM, siddharth saxena
>>>> <siddharthsaxena1989 at gmail.com> wrote:
>>>> > Hi Arun
>>>> >
>>>> > I tried changing the flag to IRQF_TRIGGER_HIGH but then device is
>>>> > behaving
>>>> > abnormally(Hangs and is dead after some time).
>>>> > Flooding interrupts still observed. Problem not solved.
>>>> >
>>>> > I want to know, are we supposed to change interrupt pin status or it is
>>>> > done
>>>> > automatically when we return IRQ_HANDLED.
>>>> why don't you paste the code for your probe routine where you are
>>>> calling request_irq.
>>>> Are you using threaded irq?It would be difficult to diagnose the
>>>> problem without looking
>>>> at your TSP manual and your code to find out the problem.
>>>> >
>>>> >
>>>> >
>>>> >
>>>> > On Thu, Jun 14, 2012 at 12:21 PM, Sarbojit Ganguly
>>>> > <unixman.linuxboy at gmail.com> wrote:
>>>> >>
>>>> >> Hi Arun,
>>>> >>
>>>> >> While I agree to your pointers but he is facing the problem of
>>>> >> "interrupt floods" even before he touches.
>>>> >> IMHO the culprit could be the flag.
>>>> >>
>>>> >> On 14 June 2012 12:01, Arun KS <getarunks at gmail.com> wrote:
>>>> >> > Hello Siddharth,
>>>> >> >
>>>> >> > On Thu, Jun 14, 2012 at 10:34 AM, siddharth saxena
>>>> >> > <siddharthsaxena1989 at gmail.com> wrote:
>>>> >> >> Hi all
>>>> >> >>
>>>> >> >> I need help with an issue.
>>>> >> >> I have written a touch driver for a device and used the flag
>>>> >> >> IRQF_TRIGGER_LOW to request irq.
>>>> >> >> Now, when I boot the device, the touch interrupts are coming already
>>>> >> >> without
>>>> >> >> touching the screen.
>>>> >> >> Continuous interrupts are occurring without any touch.
>>>> >> >
>>>> >> > Probably the default state of the gpio pin(which you configured as
>>>> >> > irq) is low. Check your HW schematic.
>>>> >> >
>>>> >> > TSC should have interrupt polarity(Active High/Low), which you have
>>>> >> > to
>>>> >> > choose depending on your schematic while initiallizing the TSC.
>>>> >> > Also different modes like assert interrupt when finger moving, when
>>>> >> > finger touch, or assert periodically.
>>>> >> >
>>>> >> > Hope these pointer will help you.
>>>> >> >
>>>> >> > Thanks,
>>>> >> > Arun
>>>> >> >
>>>> >> >>
>>>> >> >>
>>>> >> >>
>>>> >> >> --
>>>> >> >> Regards
>>>> >> >> Siddharth Saxena
>>>> >> >>
>>>> >> >>
>>>> >> >> _______________________________________________
>>>> >> >> Kernelnewbies mailing list
>>>> >> >> Kernelnewbies at kernelnewbies.org
>>>> >> >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>>> >> >>
>>>> >> >
>>>> >> > _______________________________________________
>>>> >> > Kernelnewbies mailing list
>>>> >> > Kernelnewbies at kernelnewbies.org
>>>> >> > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>>> >>
>>>> >>
>>>> >>
>>>> >> --
>>>> >> Regards,
>>>> >> Sarbojit
>>>> >
>>>> >
>>>> >
>>>> >
>>>> > --
>>>> > Regards
>>>> > Siddharth Saxena
>>>> >
>>>> >
>>>> > _______________________________________________
>>>> > Kernelnewbies mailing list
>>>> > Kernelnewbies at kernelnewbies.org
>>>> > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>>> >
>>>
>>>
>>>
>>>
>>> --
>>> Regards
>>> Siddharth Saxena
>>>
>>
>>
>>
>> --
>> Regards,
>> Sarbojit



-- 
Regards,
Sarbojit