56fb9e5346
Documentation/watchdog/: Expose example and tool source files in the Documentation/ directory in their own files instead of being buried (almost hidden) in readme/txt files. This will make them more visible/usable to users who may need to use them, to developers who may need to test with them, and to janitors who would update them if they were more visible. Also, if any of these possibly should not be in the kernel tree at all, it will be clearer that they are here and we can discuss if they should be removed. Signed-off-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be> Signed-off-by: Andrew Morton <akpm@osdl.org>
66 lines
2.3 KiB
Text
66 lines
2.3 KiB
Text
Berkshire Products PC Watchdog Card
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Support for ISA Cards Revision A and C
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Documentation and Driver by Ken Hollis <kenji@bitgate.com>
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The PC Watchdog is a card that offers the same type of functionality that
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the WDT card does, only it doesn't require an IRQ to run. Furthermore,
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the Revision C card allows you to monitor any IO Port to automatically
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trigger the card into being reset. This way you can make the card
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monitor hard drive status, or anything else you need.
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The Watchdog Driver has one basic role: to talk to the card and send
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signals to it so it doesn't reset your computer ... at least during
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normal operation.
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The Watchdog Driver will automatically find your watchdog card, and will
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attach a running driver for use with that card. After the watchdog
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drivers have initialized, you can then talk to the card using the PC
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Watchdog program, available from http://ftp.bitgate.com/pcwd/.
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I suggest putting a "watchdog -d" before the beginning of an fsck, and
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a "watchdog -e -t 1" immediately after the end of an fsck. (Remember
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to run the program with an "&" to run it in the background!)
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If you want to write a program to be compatible with the PC Watchdog
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driver, simply use of modify the watchdog test program:
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Documentation/watchdog/src/watchdog-test.c
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Other IOCTL functions include:
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WDIOC_GETSUPPORT
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This returns the support of the card itself. This
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returns in structure "PCWDS" which returns:
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options = WDIOS_TEMPPANIC
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(This card supports temperature)
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firmware_version = xxxx
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(Firmware version of the card)
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WDIOC_GETSTATUS
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This returns the status of the card, with the bits of
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WDIOF_* bitwise-anded into the value. (The comments
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are in linux/pcwd.h)
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WDIOC_GETBOOTSTATUS
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This returns the status of the card that was reported
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at bootup.
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WDIOC_GETTEMP
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This returns the temperature of the card. (You can also
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read /dev/watchdog, which gives a temperature update
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every second.)
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WDIOC_SETOPTIONS
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This lets you set the options of the card. You can either
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enable or disable the card this way.
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WDIOC_KEEPALIVE
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This pings the card to tell it not to reset your computer.
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And that's all she wrote!
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-- Ken Hollis
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(kenji@bitgate.com)
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(This documentation may be out of date. Check
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http://ftp.bitgate.com/pcwd/ for the absolute latest additions.)
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