hwmon: (pmbus) More stringent checking of VOUT_MODE register

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Some PMBus chips do not support the VOUT_MODE register. To make matters worse,
such chips may not return an error when reading the register either, but instead
return 0xff.

Check if the register exists using pmbus_check_byte_register() before reading
its value. In addition, validate the returned value and ignore it if it is 0xff
(which is invalid).

Reported-by: Greg Schnorr <gschnorr@cisco.com>
Tested-by: Greg Schnorr <gschnorr@cisco.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Acked-by: Greg Schnorr <gschnorr@cisco.com>

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This commit is contained in:

Guenter Roeck 2011-03-01 13:49:18 -08:00

parent a3eeb45353

commit 83274c68a3

1 changed files with 4 additions and 3 deletions

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7

drivers/hwmon/pmbus_core.c

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