Re: Handling interrupts in spidev

[Amit Mahadik]

Hi All,
 I am using versatile express board and have tried to allocate four 
interrupts (36 to 39) using IRQF_SHARED and IRQF_TRIGGER_HIGH flags in spidev.c 
file. However only INT 38 and 39 gets registered. For 36 and 37 I am getting 
errno 16 (Resource busy). In versatile express motherboard.h file INT 36 is RTC 
and 37 is UART0.Please help

Regards,
Amit.




On Saturday, 15 February 2014 12:21 AM, Anand Moon  wrote:
 
Hi All,

You can use netlink socket to send data from kernel to user space.

-Anand Moon



On Friday, February 14, 2014 11:51 AM, Nilesh Bacchewar 
 wrote:
 
you can use Asynchronous notification  , FASYNC .
 
http://www.makelinux.net/ldd3/chp-6-sect-4
 
Regards,
Nilesh



On Tue, Jan 28, 2014 at 9:47 PM, Vishwanath Govind 
 wrote:

You can implement irq handler in spi driver itself. SPI specific platform data 
can pass it from board file.
>Regards
>Vishwa 
>
>
>
>
>On Tue, Jan 28, 2014 at 9:24 PM, Richard Weinberger  wrote:
>
>Am 28.01.2014 15:12, schrieb Amit Mahadik:
>>
>>> Thanks Richard. One more question. If I register an SPI irq  struct 
>>> spi_board_info spi_board_info[] structure in machine board.c file; then the 
>>> request irq api and irq handler
>>> should be written in board.c file or in the spidev driver.
>>
>>Never do any programming in the board file.
>>The purpose if the board file it describing the hardware.
>>Please note, board files go away, device tree is the way to go.
>>
>>
>>Thanks,
>>//richard
>>
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Re: Handling interrupts in spidev

[Anand Moon]

Hi All,

You can use netlink socket to send data from kernel to user space.

-Anand Moon



On Friday, February 14, 2014 11:51 AM, Nilesh Bacchewar 
 wrote:
  
you can use Asynchronous notification  , FASYNC .

http://www.makelinux.net/ldd3/chp-6-sect-4

Regards, 
Nilesh



On Tue, Jan 28, 2014 at 9:47 PM, Vishwanath Govind 
 wrote:

You can implement irq handler in spi driver itself. SPI specific platform data 
can pass it from board file.
>Regards
>Vishwa 
>
>
>
>
>On Tue, Jan 28, 2014 at 9:24 PM, Richard Weinberger  wrote:
>
>Am 28.01.2014 15:12, schrieb Amit Mahadik:
>>
>>> Thanks Richard. One more question. If I register an SPI irq  struct 
>>> spi_board_info spi_board_info[] structure in machine board.c file; then the 
>>> request irq api and irq handler
>>> should be written in board.c file or in the spidev driver.
>>
>>Never do any programming in the board file.
>>The purpose if the board file it describing the hardware.
>>Please note, board files go away, device tree is the way to go.
>>
>>
>>Thanks,
>>//richard
>>
>>___
>>Kernelnewbies mailing list
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>>
> 
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>


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Re: Handling interrupts in spidev

[Nilesh Bacchewar]

you can use Asynchronous notification  , FASYNC .

http://www.makelinux.net/ldd3/chp-6-sect-4

Regards,
Nilesh


On Tue, Jan 28, 2014 at 9:47 PM, Vishwanath Govind <
vishwanath.gov...@gmail.com> wrote:

> You can implement irq handler in spi driver itself. SPI specific platform
> data can pass it from board file.
> Regards
> Vishwa
>
>
> On Tue, Jan 28, 2014 at 9:24 PM, Richard Weinberger wrote:
>
>> Am 28.01.2014 15:12, schrieb Amit Mahadik:
>> > Thanks Richard. One more question. If I register an SPI irq  struct
>> spi_board_info spi_board_info[] structure in machine board.c file; then the
>> request irq api and irq handler
>> > should be written in board.c file or in the spidev driver.
>>
>> Never do any programming in the board file.
>> The purpose if the board file it describing the hardware.
>> Please note, board files go away, device tree is the way to go.
>>
>> Thanks,
>> //richard
>>
>> ___
>> Kernelnewbies mailing list
>> Kernelnewbies@kernelnewbies.org
>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>
>
>
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Re: Handling interrupts in spidev

[Vishwanath Govind]

You can implement irq handler in spi driver itself. SPI specific platform
data can pass it from board file.
Regards
Vishwa


On Tue, Jan 28, 2014 at 9:24 PM, Richard Weinberger  wrote:

> Am 28.01.2014 15:12, schrieb Amit Mahadik:
> > Thanks Richard. One more question. If I register an SPI irq  struct
> spi_board_info spi_board_info[] structure in machine board.c file; then the
> request irq api and irq handler
> > should be written in board.c file or in the spidev driver.
>
> Never do any programming in the board file.
> The purpose if the board file it describing the hardware.
> Please note, board files go away, device tree is the way to go.
>
> Thanks,
> //richard
>
> ___
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>
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Re: Handling interrupts in spidev

[Richard Weinberger]

Am 28.01.2014 15:12, schrieb Amit Mahadik:
> Thanks Richard. One more question. If I register an SPI irq  struct 
> spi_board_info spi_board_info[] structure in machine board.c file; then the 
> request irq api and irq handler
> should be written in board.c file or in the spidev driver.

Never do any programming in the board file.
The purpose if the board file it describing the hardware.
Please note, board files go away, device tree is the way to go.

Thanks,
//richard

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Re: Handling interrupts in spidev

[Amit Mahadik]

Thanks Richard. One more question. If I register an SPI irq  struct 
spi_board_info spi_board_info[] structure in machine board.c file; then the 
request irq api and irq handler should be written in board.c file or in the 
spidev driver.

Regards,
Amit.



On Monday, 27 January 2014 2:54 PM, Richard Weinberger  wrote:
 
Am 27.01.2014 10:21, schrieb Amit Mahadik:
> Thanks for your input. But I dont want to block the read call. Also I dont 
> want to miss the interrupts.

Look how other drivers/programs deal with that...

Thanks,
//richard

> Regards,
> Amit.
> 
> 
> On Monday, 27 January 2014 12:22 PM, Richard Weinberger  
> wrote:
> Am 27.01.2014 06:37, schrieb Amit Mahadik:
>> Thanks for the reply Richard.
>>        The interrupt is not a GPIO  pin. I have read something about UIO 
>>(userspace I/O).
>> Also, I want the operation to be asynchronous. Any pointer to such mechanism 
>> will be very helpful.
> 
> Using UIO you can also catch an interrupt in userspace.
> You can have a read() which blocks till data is available.
> 
> 
> Thanks,
> //richard
> 
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> 
> 

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Re: Handling interrupts in spidev

[Richard Weinberger]

Am 27.01.2014 10:21, schrieb Amit Mahadik:
> Thanks for your input. But I dont want to block the read call. Also I dont 
> want to miss the interrupts.

Look how other drivers/programs deal with that...

Thanks,
//richard

> Regards,
> Amit.
> 
> 
> On Monday, 27 January 2014 12:22 PM, Richard Weinberger  
> wrote:
> Am 27.01.2014 06:37, schrieb Amit Mahadik:
>> Thanks for the reply Richard.
>>The interrupt is not a GPIO  pin. I have read something about UIO 
>> (userspace I/O).
>> Also, I want the operation to be asynchronous. Any pointer to such mechanism 
>> will be very helpful.
> 
> Using UIO you can also catch an interrupt in userspace.
> You can have a read() which blocks till data is available.
> 
> 
> Thanks,
> //richard
> 
> ___
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Re: Handling interrupts in spidev

[Amit Mahadik]

Thanks for your input. But I dont want to block the read call. Also I dont want 
to miss the interrupts.

Regards,
Amit.




On Monday, 27 January 2014 12:22 PM, Richard Weinberger  wrote:
 
Am 27.01.2014 06:37, schrieb Amit Mahadik:
> Thanks for the reply Richard.
>         The interrupt is not a GPIO  pin. I have read something about UIO 
>(userspace I/O).
> Also, I want the operation to be asynchronous. Any pointer to such mechanism 
> will be very helpful.

Using UIO you can also catch an interrupt in userspace.
You can have a read() which blocks till data is available.


Thanks,
//richard

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Re: Handling interrupts in spidev

[Richard Weinberger]

Am 27.01.2014 06:37, schrieb Amit Mahadik:
> Thanks for the reply Richard.
> The interrupt is not a GPIO  pin. I have read something about UIO 
> (userspace I/O).
> Also, I want the operation to be asynchronous. Any pointer to such mechanism 
> will be very helpful.

Using UIO you can also catch an interrupt in userspace.
You can have a read() which blocks till data is available.

Thanks,
//richard

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Re: Handling interrupts in spidev

[Amit Mahadik]

Thanks for the reply Richard. 

    The interrupt is not a GPIO  pin. I have read something about UIO 
(userspace I/O). 

Also, I want the operation to be asynchronous. Any pointer to such mechanism 
will be very helpful.

Regards,
Amit.




On Sunday, 26 January 2014 8:53 PM, Richard Weinberger 
 wrote:
 
On Sun, Jan 26, 2014 at 1:25 PM, Amit Mahadik  wrote:

> Hello,
>           I am using a custom ARM board. I have a SPI slave device and using
> the spidev_test utility I am able to do ioctls on the slave device.
> However, I have a problem. The SPI slave device has an interrupt pin and I
> want to process the interrupt and send some data into the userspace when I
> receive the interrupt. Can anybody please suggest me a way to do this using
> spidev driver?

Is the interrupt pin a gpio?
If so, you can access it from userspace and identify interrupts using poll().

-- 
Thanks,
//richard

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Re: Handling interrupts in spidev

[Richard Weinberger]

On Sun, Jan 26, 2014 at 1:25 PM, Amit Mahadik  wrote:
> Hello,
>   I am using a custom ARM board. I have a SPI slave device and using
> the spidev_test utility I am able to do ioctls on the slave device.
> However, I have a problem. The SPI slave device has an interrupt pin and I
> want to process the interrupt and send some data into the userspace when I
> receive the interrupt. Can anybody please suggest me a way to do this using
> spidev driver?

Is the interrupt pin a gpio?
If so, you can access it from userspace and identify interrupts using poll().

-- 
Thanks,
//richard

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Handling interrupts in spidev

[Amit Mahadik]

Hello,
          I am using a custom ARM board. I have a SPI slave device and using 
the spidev_test utility I am able to do ioctls on the slave device.
However, I have a problem. The SPI slave device has an interrupt pin and I want 
to process the interrupt and send some data into the userspace when I receive 
the interrupt. Can anybody please suggest me a way to do this using spidev 
driver?

Regards,
Amit.___
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