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hwmon: (sch56xx) Add support for the integrated watchdog (v2)

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Add support for the watchdog integrated into the SMSC SCH5627 and
SCH5636 superio-s. Since the watchdog is part of the hwmon logical device
and thus shares ioports with it, the watchdog driver is integrated into the
existing hwmon drivers for these.

Note that this version of the watchdog support for sch56xx superio-s
implements the watchdog chardev interface itself, rather then relying on
the recently added watchdog core / watchdog_dev. This is done because
currently some needed functionality is missing from watchdog_dev, as soon
as this functionality is added (which is being discussed on the
linux-watchdog mailinglist), I'll convert this driver over to using
watchdog_dev.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
[guenter.roeck@ericsson.com: Added missing linux/slab.h include]
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
This commit is contained in:
Hans de Goede
2012-03-18 13:05:08 +01:00
committed by Guenter Roeck
parent 840e191dba
commit 312869ec93
7 changed files with 558 additions and 7 deletions
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5
Documentation/hwmon/sch5627
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@@ -16,6 +16,11 @@ Description
SMSC SCH5627 Super I/O chips include complete hardware monitoring
capabilities. They can monitor up to 5 voltages, 4 fans and 8 temperatures.
The SMSC SCH5627 hardware monitoring part also contains an integrated
watchdog. In order for this watchdog to function some motherboard specific
initialization most be done by the BIOS, so if the watchdog is not enabled
by the BIOS the sch5627 driver will not register a watchdog device.
The hardware monitoring part of the SMSC SCH5627 is accessed by talking
through an embedded microcontroller. An application note describing the
protocol for communicating with the microcontroller is available upon

3
Documentation/hwmon/sch5636
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@@ -26,6 +26,9 @@ temperatures. Note that the driver detects how many fan headers /
temperature sensors are actually implemented on the motherboard, so you will
likely see fewer temperature and fan inputs.
The Fujitsu Theseus hwmon solution also contains an integrated watchdog.
This watchdog is fully supported by the sch5636 driver.
An application note describing the Theseus' registers, as well as an
application note describing the protocol for communicating with the
microcontroller is available upon request. Please mail me if you want a copy.