A problem about the LCD driver in the kernel 2.6.14-omap.

A problem about the LCD driver in the kernel 2.6.14-omap.

[lei lei]

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hi all,
    THE file place is in drivers/video/omap/lcd_osk.c.
    In the omap5912 board---osk,there is not LCD,so  I want to know
the LCD driver in the 2.6.14-omap is for which LCD.
    Thanks!

-- 
雷波 bolei

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Re: A problem about the LCD driver in the kernel 2.6.14-omap.

[Dirk Behme]

lei lei wrote:
> hi all,
>    THE file place is in drivers/video/omap/lcd_osk.c.
>    In the omap5912 board---osk,there is not LCD,so  I want to know
> the LCD driver in the 2.6.14-omap is for which LCD.

http://www.mistralsoftware.com/html/product/omap_products/products-omap5912_starterkit.php

See

http://tree.celinuxforum.org/CelfPubWiki/OSK

as well.

Dirk

Using SPI

[Arnold]

Hi Guys,

I've been exploring SPI on the kernel. I've started
reading on how SPI works. I've learned that all SPI
drivers are currently kernel drivers. I would to know
if anybody have tried to do a userspace driver API? Or
anybody knows of an opensource userspace driver that
offers low-level access?

Thanks,
OJ 

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omap5912 audio driver

[zil iram]

Hi,

       I have been trying out the audio driver for the OSK and I followed 
the procedures in http://oskfordummies.hp.infoseek.co.jp/howto/audio.html. 
When I compiled the kernel (version 2.6.16) with the audio drivers enabled, 
an error occured with this message :
                sound/oss/omap-audio-aic23.c:246: error: unknown field `sem' 
specified in initializer
To move on with my work, I just commented out the line
                .sem        = __SEMAPHORE_INIT(aic23_state.sem, 1)
inside the structure static audio_state_t aic23_state of the file specified 
in the error message.  So the kernel compiled. Do you know what is wrong?
     With what I've done above, I was able to record and playback the sound 
file that I recorded perfectly. However, when I play a different file,  a 
.au Sun/NeXT audio data: 16-bit linear PCM, stereo, 8000 Hz file, the file 
tends to be played really fast even if I have already set the configurations 
through the file audioconf.c given in the link above. When I converted this 
audio file to have a sampling rate of 22050, the playback was almost perfect 
even if the setting was still set to 8khz. I am thinking that the sampling 
rate cannot be set through the audioconf app and that the audio driver is 
using the same constant value.
    Also, when I play mono 16bit .wav files, with sampling rate of 44000 and 
above, all the files are played well even if I am using the same 24000hz as 
sampling rate.
Does anybody know what the problem here is?

Thank you very much,
Zil

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Re: Using SPI

[Dirk Behme]

Arnold wrote:
> I've learned that all SPI
> drivers are currently kernel drivers. I would to know
> if anybody have tried to do a userspace driver API?

Maybe you are interested in

http://lwn.net/Articles/197523/

Dirk

Re: omap5912 audio driver

[Dirk Behme]

zil iram wrote:
> When I compiled 
> the kernel (version 2.6.16) with the audio drivers enabled, an error 
> occured with this message :
>                sound/oss/omap-audio-aic23.c:246: error: unknown field 
> `sem' specified in initializer
> To move on with my work, I just commented out the line
>                .sem        = __SEMAPHORE_INIT(aic23_state.sem, 1)
> inside the structure static audio_state_t aic23_state of the file 
> specified in the error message.  So the kernel compiled. Do you know 
> what is wrong?

Can you try and check the same with recent kernel from git?

Dirk

Re: omap5912 audio driver

[zil iram]

Hi Dirk,
          Thanks, I tried using kernel 2.6.17 and the audio driver is now 
compiling and working.
           Thank you very much!
Zil

>From: Dirk Behme <dirk.behme@googlemail.com>
>To: zil iram <zil_iram@hotmail.com>
>CC: Linux-omap-open-source@linux.omap.com
>Subject: Re: omap5912 audio driver
>Date: Mon, 11 Sep 2006 16:39:46 +0200
>
>zil iram wrote:
>>When I compiled the kernel (version 2.6.16) with the audio drivers 
>>enabled, an error occured with this message :
>>                sound/oss/omap-audio-aic23.c:246: error: unknown field 
>>`sem' specified in initializer
>>To move on with my work, I just commented out the line
>>                .sem        = __SEMAPHORE_INIT(aic23_state.sem, 1)
>>inside the structure static audio_state_t aic23_state of the file 
>>specified in the error message.  So the kernel compiled. Do you know what 
>>is wrong?
>
>Can you try and check the same with recent kernel from git?
>
>Dirk

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Re: Using SPI

[David Brownell]

> I've been exploring SPI on the kernel. I've started
> reading on how SPI works. I've learned that all SPI
> drivers are currently kernel drivers.

That's normal for drivers that may use IRQs and/or DMA.


>	I would to know
> if anybody have tried to do a userspace driver API? Or
> anybody knows of an opensource userspace driver that
> offers low-level access?

A patch was recently posted on the SPI developers' list
providing a userspace/filesystem API ... I've not had
time to look at this incarnation of the patch.

- Dave