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How to drive a LCD on ARM based linux System

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Operating Systems Linux How to drive a LCD on ARM based linux System
# 1  
Old 12-18-2007
Bug How to drive a LCD on ARM based linux System
Hello sir,

I am Vijay Manohar. I am a writing a device driver for LCD frame buffer device. In this , LCD has been mapped at physical address 0x3000000. Now I want to implement mmap entry point. I have two questions regarding this

Can I use this physical address as one of the parameters to remap_pfn_range.

How to use DMA, in order to transfer data to the specified address. Firstly I it possible this sort of transfer.

Help is highly appreciated Smilie,

Regards,
Vijay Manohar
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LEARN ABOUT NETBSD

sony

SONY(4) 						   BSD Kernel Interfaces Manual 						   SONY(4)

NAME

     sony -- Sony Miscellaneous Controller

SYNOPSIS

     sony*    at acpi?

DESCRIPTION

     Some Sony notebook computers have a controller that handles various built-in devices.  The sony driver provides support for accessing/modify-
     ing the settings of some of these devices via the sysctl(8) interface.

     The following sysctl(8) variables are available:

     hw.sony0.brt [R/W]  Controls current LCD brightness.  Range [0-8].
     hw.sony0.pbr [R/W]  Controls power on LCD brightness.  Range [0-8].
     hw.sony0.cdp [R/W]  Controls CD power.
     hw.sony0.pid [R/O]  Unknown
     hw.sony0.ctr [R/W]  Unknown
     hw.sony0.pcr [R/W]  Unknown
     hw.sony0.cmi [R/W]  Unknown
     hw.sony0.ams [R/W]  Audio control (mute when 0)
     hw.sony0.hke [R/O]  Indicates a Host Key Event.  Bits are set when an event occurs and cleared when this value is read.  The following table
			 describes the bit set for each button pressed:

			       0x1000  S1 button
			       0x0800  S2 button
			       0x0200  Fn + F10 (magnify)
			       0x0100  Mute button
			       0x0020  Fn + F12 (suspend to disk)
			       0x0010  Fn + F7 (LCD/external monitor)
			       0x0008  Fn + F6 (brighter backlight)
			       0x0004  Fn + F5 (darker backlight)
			       0x0002  Fn + F4 (volume up)
			       0x0001  Fn + F3 (volume down)

SEE ALSO

     acpi(4), spic(4)

HISTORY

     The sony driver appeared in NetBSD 4.0.

AUTHORS

     Sami Kantoluoto for the original driver and manual information.  Christos Zoulas for cleaning up the driver and this manual page.

BUGS

     o	 The sony driver just parses integer values from the acpi(4) tree.  It could be more intelligent and parse other controls.

     o	 The sysctl(8) interface is not great.	The names of the sysctl(8) tree are not self-explanatory.

     o	 No validity checks are performed on the user input.  Playing with random values and/or unknown controls can harm your machine.

     o	 The name of the driver is too generic.

BSD
								 December 23, 2007							       BSD