Continuous Interrupt Problem

[anish singh]

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
>>> >> >>
>>> >> >
>>> >> > _______________________________________________
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>>> >> > 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