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| author | Guenter Roeck <guenter.roeck@ericsson.com> | 2011-06-30 06:54:05 -0700 |
|---|---|---|
| committer | Guenter Roeck <guenter.roeck@ericsson.com> | 2011-07-01 15:56:06 -0700 |
| commit | 81ae68142a0483b3791cba99eab268859858f508 (patch) | |
| tree | fa52ff3ead009c455a0fb41ec4bd8567ecde714c /drivers/hwmon/pmbus.c | |
| parent | 3b33ca41227a54a78446fb0d7a6fdb9862f563db (diff) | |
| download | lwn-81ae68142a0483b3791cba99eab268859858f508.tar.gz lwn-81ae68142a0483b3791cba99eab268859858f508.zip | |
hwmon: (pmbus) Improve fan detection
Some PMBus devices return no error when reading fan speed registers, but don't
really support fans. Strengthen fan detection by also checking if fan
configuration registers exist.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
Cc: stable.kernel.org # 2.6.39
Diffstat (limited to 'drivers/hwmon/pmbus.c')
| -rw-r--r-- | drivers/hwmon/pmbus.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/hwmon/pmbus.c b/drivers/hwmon/pmbus.c index 98e2e28899e2..b0ea00b75f17 100644 --- a/drivers/hwmon/pmbus.c +++ b/drivers/hwmon/pmbus.c @@ -47,12 +47,14 @@ static void pmbus_find_sensor_groups(struct i2c_client *client, if (info->func[0] && pmbus_check_byte_register(client, 0, PMBUS_STATUS_INPUT)) info->func[0] |= PMBUS_HAVE_STATUS_INPUT; - if (pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_1)) { + if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_12) && + pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_1)) { info->func[0] |= PMBUS_HAVE_FAN12; if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_12)) info->func[0] |= PMBUS_HAVE_STATUS_FAN12; } - if (pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_3)) { + if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_34) && + pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_3)) { info->func[0] |= PMBUS_HAVE_FAN34; if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_34)) info->func[0] |= PMBUS_HAVE_STATUS_FAN34; |