general question: spi framework

general question: spi framework

[Dimitar Penev]

Hi Guys,

I have a pretty general question about the spi framework.
I hope this is not off topic for this list.

So it is about uclinux kernel 2.6.28 for blackfin cpu. 

1. I undestand how to define my spi data in the board file. 
2. I have kernel device driver for my spi chip.
3. I have read about linux/spi/spi.h and the spi protocol driver API which
   is exported. 
spi_read(struct spi_device *spi, u8 *buf, size_t len)
spi_write(struct spi_device *spi, const u8 *buf, size_t len)
etc ...

I would like to use this API from another kernel module (so kernel space)
For me it is unclear however how to get pointer to spi_device from my kernel module. In general is there somewhere an example for using of the spi framework from the kernel space. 
I don't want to write spi device drivers. It is already written in the linux tree. I would like to use it from the kernel space.     

Thank you for all pointers you provide!
Dimitar
  





      

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Re: general question: spi framework

[Baruch Siach]

Hi Dimitar,

On Fri, May 28, 2010 at 03:40:18AM -0700, Dimitar Penev wrote:
> I would like to use this API from another kernel module (so kernel space)
> For me it is unclear however how to get pointer to spi_device from my kernel 
> module. In general is there somewhere an example for using of the spi 
> framework from the kernel space.  I don't want to write spi device drivers.  
> It is already written in the linux tree. I would like to use it from the 
> kernel space.     

See drivers/net/enc28j60.c (Ethernet driver), and drivers/mtd/devices/m25p80.c 
(Flash driver).

baruch

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