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71 lines
2.3 KiB
71 lines
2.3 KiB
=================================== |
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Berkshire Products PC Watchdog Card |
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=================================== |
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Last reviewed: 10/05/2007 |
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Support for ISA Cards Revision A and C |
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======================================= |
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Documentation and Driver by Ken Hollis <[email protected]> |
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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 a PC |
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Watchdog program. |
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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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tools/testing/selftests/watchdog/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 include/uapi/linux/watchdog.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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([email protected])
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