[lcd4linux] (no subject)

[Abhishek K. <neu...@ho...>]

hello

>>(1)How does the   driver  figures  out the  VENDOR  ID  and  the PRODUCT  
>>ID  for the USBLCd.cm  and  README.Drivers ?
>>My   Grand  Pacific  Corporation  LCD  has  some  vendor  ID  and product
>>   Id  but I dont  know  how to  make  the   driver  know  that ?
>
>
>Normally lcd4linux does not care for such things. Most USB displays emulate 
>a serial interface via USB, and lcd4linux talks to it via /dev/usb/tts/*
>
>USBLCD on the other hand has its own kernel driver, which provides the 
>/dev/usb/lcd, that's it. I can see no vendor/device id's here.
>

(1)Fine... but the moment you plug in the USBLCD to the usb port,how does 
the  kernerl  recognises that UBLCD's  brand lcd has entered (I guess that's 
  usb's functionality to provide plug and play facility).
plus how does it assigns /dev/usb/lcd to the USBLCD.The  hardware (USBLCD 
inthis case) must be having some identification  right ?

>>(2)Second thing ,I  want  to send  a  bitstream  of  "10101010101..." pout 
>>  through the  USB  port to  my  LCD.
>>Do  I  need  to  write a  seaparate  code  to  send the  data  out  to  
>>LCd  or  I can  do  that  using  my  Skeleton.c(for  grand pacific.. ) ?
>
>Well, that depends.
>Maybe it would be best if you could send me a datasheet of your display.
>  I'll have a look over it and tell you which method would be best, and 
>which existing driver you could use as a basis.
>


(2)I am sending you the data sheet of the  LCD.Actually we are  using an LCD 
  with a "ezusb"  chip (cypress)  which is the usb peripheral  controller 
device on the  device side.

>>Can  I  use  put()  and  icon()  functions  or  flush() ?
>>I  am  unabel to   understand  how "what  these   functions  are sending  
>>out  to the  USBLCD.c
>
>Normally all the put() and bar() functions fill up a framebuffer only. the 
>flush() function writes this framebuffer (or only changes) to the display.

>The icon() call is somewhat different: It does animations, too, by 
>re-defining a custom character.
>
>>
>>(3)What   about open   function ?
>>in    README.Drivers  we  are  not  asked  to   3write  open() function ??
>
>An open() is usually performed within the LCD->init() function, and the 
>corresponding close() in the LCD->quit()
>
>

(3)Can I  directly write something out of  USB to the device say USBLD usnig 
the  driver or  do I need to  write a  different  code for  it ?

regards
abhi

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