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- Kernel driver i2c-voodoo3
- Supported adapters:
- * 3dfx Voodoo3 based cards
- * Voodoo Banshee based cards
- Authors:
- Frodo Looijaard <frodol@dds.nl>,
- Philip Edelbrock <phil@netroedge.com>,
- Ralph Metzler <rjkm@thp.uni-koeln.de>,
- Mark D. Studebaker <mdsxyz123@yahoo.com>
- Main contact: Philip Edelbrock <phil@netroedge.com>
-
- The code is based upon Ralph's test code (he did the hard stuff ;')
- Description
- -----------
- The 3dfx Voodoo3 chip contains two I2C interfaces (aka a I2C 'master' or
- 'host').
- The first interface is used for DDC (Data Display Channel) which is a
- serial channel through the VGA monitor connector to a DDC-compliant
- monitor. This interface is defined by the Video Electronics Standards
- Association (VESA). The standards are available for purchase at
- http://www.vesa.org .
- The second interface is a general-purpose I2C bus. The intent by 3dfx was
- to allow manufacturers to add extra chips to the video card such as a
- TV-out chip such as the BT869 or possibly even I2C based temperature
- sensors like the ADM1021 or LM75.
- Stability
- ---------
- Seems to be stable on the test machine, but needs more testing on other
- machines. Simultaneous accesses of the DDC and I2C busses may cause errors.
- Supported Devices
- -----------------
- Specifically, this driver was written and tested on the '3dfx Voodoo3 AGP
- 3000' which has a tv-out feature (s-video or composite). According to the
- docs and discussions, this code should work for any Voodoo3 based cards as
- well as Voodoo Banshee based cards. The DDC interface has been tested on a
- Voodoo Banshee card.
-
- Issues
- ------
- Probably many, but it seems to work OK on my system. :')
- External Device Connection
- --------------------------
- The digital video input jumpers give availability to the I2C bus.
- Specifically, pins 13 and 25 (bottom row middle, and bottom right-end) are
- the I2C clock and I2C data lines, respectively. +5V and GND are probably
- also easily available making the addition of extra I2C/SMBus devices easy
- to implement.
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