Based on kernel version 2.6.32. Page generated on 2009-12-11 16:22 EST.
1 Kernel driver i2c-voodoo3 2 3 Supported adapters: 4 * 3dfx Voodoo3 based cards 5 * Voodoo Banshee based cards 6 7 Authors: 8 Frodo Looijaard <frodol[AT]dds[DOT]nl>, 9 Philip Edelbrock <phil[AT]netroedge[DOT]com>, 10 Ralph Metzler <rjkm[AT]thp.uni-koeln[DOT]de>, 11 Mark D. Studebaker <mdsxyz123[AT]yahoo[DOT]com> 12 13 Main contact: Philip Edelbrock <phil[AT]netroedge[DOT]com> 14 15 The code is based upon Ralph's test code (he did the hard stuff ;') 16 17 Description 18 ----------- 19 20 The 3dfx Voodoo3 chip contains two I2C interfaces (aka a I2C 'master' or 21 'host'). 22 23 The first interface is used for DDC (Data Display Channel) which is a 24 serial channel through the VGA monitor connector to a DDC-compliant 25 monitor. This interface is defined by the Video Electronics Standards 26 Association (VESA). The standards are available for purchase at 27 http://www.vesa.org . 28 29 The second interface is a general-purpose I2C bus. The intent by 3dfx was 30 to allow manufacturers to add extra chips to the video card such as a 31 TV-out chip such as the BT869 or possibly even I2C based temperature 32 sensors like the ADM1021 or LM75. 33 34 Stability 35 --------- 36 37 Seems to be stable on the test machine, but needs more testing on other 38 machines. Simultaneous accesses of the DDC and I2C busses may cause errors. 39 40 Supported Devices 41 ----------------- 42 43 Specifically, this driver was written and tested on the '3dfx Voodoo3 AGP 44 3000' which has a tv-out feature (s-video or composite). According to the 45 docs and discussions, this code should work for any Voodoo3 based cards as 46 well as Voodoo Banshee based cards. The DDC interface has been tested on a 47 Voodoo Banshee card. 48 49 Issues 50 ------ 51 52 Probably many, but it seems to work OK on my system. :') 53 54 55 External Device Connection 56 -------------------------- 57 58 The digital video input jumpers give availability to the I2C bus. 59 Specifically, pins 13 and 25 (bottom row middle, and bottom right-end) are 60 the I2C clock and I2C data lines, respectively. +5V and GND are probably 61 also easily available making the addition of extra I2C/SMBus devices easy 62 to implement.