where can I find the pl2303 vendor reference?

[c-aries <babyaries2@xxxxxxxxx>]

Hi all.
When I read the pl2303 driver source code in linux-2.6.36, I am confuse
about these codes:

$ cat -n pl2303.c
...
  125  #define VENDOR_WRITE_REQUEST_TYPE       0x40
  126  #define VENDOR_WRITE_REQUEST            0x01
  127
  128  #define VENDOR_READ_REQUEST_TYPE        0xc0
  129  #define VENDOR_READ_REQUEST             0x01
...
  179  static int pl2303_startup(struct usb_serial *serial)
  180  {
...
  210          pl2303_vendor_read(0x8484, 0, serial, buf);
  211          pl2303_vendor_write(0x0404, 0, serial);
...
  236  }
...
$

I download the pl2303 datasheet, but can't find anything related to
vendor specific read, write methods. So I can't figure out what does
0x8484 and 0x0404 mean.

Could you tell me where can I find the pl2303 vendor read write methods'
reference?
Thanks.



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