Please find below a patch against kernel 2.6.5-rc2-mm4 to add the pcf8591
driver (a 8-bit A/D and D/A converter). I have ported it from the 2.4
version, and it includes some fixes, improvements and simplifications.

It has been reviewed by Jean Delvare on IRC.

Please also note that the patch also fixes a missing space in
drivers/i2c/chips/Kconfig, introduced by the previous patch I sent you
concerning the pcf8574.