Question about synth_request_region

[Kerry Hoath]

Looks like the irq is level triggered which is standard for PCI devices 
usually.
Code that uses level triggered interrupts  needs to pass the
sa_irq flag to the handler or similar i'm not sure.
It's not as simple as just plugging the irqs for your PCI device into 
the kernel there is a programming difference between edge triggered to 
level triggered.


On 1/07/2010 4:42 AM, Trevor Astrope wrote:
> One thing to add to the below. According to lspci, my serial port is 
> using irq 16. It also reports that an usb and vga controller are also 
> using irq 16.
>
> So, is my problem not the pci express card itself, but rather that the 
> irq is being shared and speakup can't get an exclusive lock on it?
>
> If so, is there any way for speakup to play nice and share the irq?
>
> Thanks,
>
> Trevor On Wed, 30 Jun 2010, Trevor Astrope wrote:
>
>> Merci Samuel.
>>
>> I thought it might have  something to do with the types of serial 
>> ports defined in the kernels include/linux/serial.h. Btw, it defines 
>> PORT_MAX as 13. Not sure if this is the same thing, but I was unable 
>> to detect my dectalk via my pci express serial card after changing it 
>> to 13.
>>
>> Actually, if I comment out that whole if block including the check 
>> for the error, speakup_dectlk does report that it found the dectalk 
>> on ttyS0, but it only says, ""DecTalk Express ready" in a very sick 
>> sounding voice.
>>
>> If I uncomment the below around line 79 of serialio.c, it does print 
>> "in irq" many times in the logs and eventually says, "Too many 
>> timeouts, deactivating speakup."
>>
>> /*printk(KERN_ERR "in irq\n"); */
>> /*pr_warn("in IRQ\n"); */
>>
>> So, it looks like there is more to the problem.
>>
>> Btw, I changed the values of ttyS0 to 0xCC00 and 16 for the i/o 
>> address and irq respectively in the kernels 
>> arch/x86/include/asm/serial.h file to match the output of setserial 
>> /dev/ttyS0 -a
>>
>>
>> On Wed, 30 Jun 2010, Samuel Thibault wrote:
>>
>>> Trevor Astrope, le Wed 30 Jun 2010 13:47:36 -0400, a écrit :
>>>> Does anyone know what the value 8 refers to in the 
>>>> synth_request_region
>>>> calls in serio.c?
>>>
>>> The number of io ports, starting from the base.
>>>
>>> Samuel
>>> _______________________________________________
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>>> Speakup at braille.uwo.ca
>>> http://speech.braille.uwo.ca/mailman/listinfo/speakup
>>>
>>
>
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