From: Guenter Roeck Date: Thu, 30 Jun 2011 13:54:05 +0000 (-0700) Subject: hwmon: (pmbus) Improve fan detection X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=81ae68142a0483b3791cba99eab268859858f508;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git 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 Reviewed-by: Robert Coulson Cc: stable.kernel.org # 2.6.39 --- 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;