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hwmon: (pmbus) Improve fan detection

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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 <[email protected]>
Reviewed-by: Robert Coulson <[email protected]>
Cc: stable.kernel.org # 2.6.39
This commit is contained in:
Guenter Roeck 2011-06-30 06:54:05 -07:00
commit 81ae68142a
1 changed files with 4 additions and 2 deletions
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6
drivers/hwmon/pmbus.c
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@ -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;