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diff --git a/Documentation/watchdog/pcwd-watchdog.rst b/Documentation/watchdog/pcwd-watchdog.rst new file mode 100644 index 000000000000..405e2a370082 --- /dev/null +++ b/Documentation/watchdog/pcwd-watchdog.rst @@ -0,0 +1,71 @@ +=================================== +Berkshire Products PC Watchdog Card +=================================== + +Last reviewed: 10/05/2007 + +Support for ISA Cards Revision A and C +======================================= + +Documentation and Driver by Ken Hollis <kenji@bitgate.com> + + The PC Watchdog is a card that offers the same type of functionality that + the WDT card does, only it doesn't require an IRQ to run. Furthermore, + the Revision C card allows you to monitor any IO Port to automatically + trigger the card into being reset. This way you can make the card + monitor hard drive status, or anything else you need. + + The Watchdog Driver has one basic role: to talk to the card and send + signals to it so it doesn't reset your computer ... at least during + normal operation. + + The Watchdog Driver will automatically find your watchdog card, and will + attach a running driver for use with that card. After the watchdog + drivers have initialized, you can then talk to the card using a PC + Watchdog program. + + I suggest putting a "watchdog -d" before the beginning of an fsck, and + a "watchdog -e -t 1" immediately after the end of an fsck. (Remember + to run the program with an "&" to run it in the background!) + + If you want to write a program to be compatible with the PC Watchdog + driver, simply use of modify the watchdog test program: + tools/testing/selftests/watchdog/watchdog-test.c + + + Other IOCTL functions include: + + WDIOC_GETSUPPORT + This returns the support of the card itself. This + returns in structure "PCWDS" which returns: + + options = WDIOS_TEMPPANIC + (This card supports temperature) + firmware_version = xxxx + (Firmware version of the card) + + WDIOC_GETSTATUS + This returns the status of the card, with the bits of + WDIOF_* bitwise-anded into the value. (The comments + are in linux/pcwd.h) + + WDIOC_GETBOOTSTATUS + This returns the status of the card that was reported + at bootup. + + WDIOC_GETTEMP + This returns the temperature of the card. (You can also + read /dev/watchdog, which gives a temperature update + every second.) + + WDIOC_SETOPTIONS + This lets you set the options of the card. You can either + enable or disable the card this way. + + WDIOC_KEEPALIVE + This pings the card to tell it not to reset your computer. + + And that's all she wrote! + + -- Ken Hollis + (kenji@bitgate.com) |