[PATCH] dell-smm-hwmon: Detect fan with index=2

Pali Rohár
2016-05-21T14:52:46Z

Some Dell machines (e.g. Dell Precision M3800) have two fans, first with
index=0 and second with index=2. So export also attributes for third fan
device with index=2.

Reported-by: Tolga Cakir <cevelnet@gmail.com>
Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
---
drivers/hwmon/dell-smm-hwmon.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
---

Hi Tolga! Can you test this patch if sensors see fan device correctly?

diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index 577445f..7a2764a 100644
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -78,6 +78,7 @@ static uint i8k_fan_max = I8K_FAN_HIGH;
#define I8K_HWMON_HAVE_TEMP4 (1 << 3)
#define I8K_HWMON_HAVE_FAN1 (1 << 4)
#define I8K_HWMON_HAVE_FAN2 (1 << 5)
+#define I8K_HWMON_HAVE_FAN3 (1 << 6)

MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
@@ -246,7 +247,7 @@ static int _i8k_get_fan_type(int fan)
static int i8k_get_fan_type(int fan)
{
/* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */
- static int types[2] = { INT_MIN, INT_MIN };
+ static int types[3] = { INT_MIN, INT_MIN, INT_MIN };

if (types[fan] == INT_MIN)
types[fan] = _i8k_get_fan_type(fan);
@@ -707,6 +708,12 @@ static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
1);
static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
i8k_hwmon_set_pwm, 1);
+static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
+ 2);
+static SENSOR_DEVICE_ATTR(fan3_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
+ 2);
+static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
+ i8k_hwmon_set_pwm, 2);

static struct attribute *i8k_attrs[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */
@@ -723,6 +730,9 @@ static struct attribute *i8k_attrs[] = {
&sensor_dev_attr_fan2_input.dev_attr.attr, /* 11 */
&sensor_dev_attr_fan2_label.dev_attr.attr, /* 12 */
&sensor_dev_attr_pwm2.dev_attr.attr, /* 13 */
+ &sensor_dev_attr_fan3_input.dev_attr.attr, /* 14 */
+ &sensor_dev_attr_fan3_label.dev_attr.attr, /* 15 */
+ &sensor_dev_attr_pwm3.dev_attr.attr, /* 16 */
NULL
};

@@ -747,6 +757,9 @@ static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
if (index >= 11 && index <= 13 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
return 0;
+ if (index >= 14 && index <= 16 &&
+ !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN3))
+ return 0;

return attr->mode;
}
@@ -788,6 +801,11 @@ static int __init i8k_init_hwmon(void)
if (err >= 0)
i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;

+ /* Third fan attributes, if fan status is OK */
+ err = i8k_get_fan_status(2);
+ if (err >= 0)
+ i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN3;
+
i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm",
NULL, i8k_groups);
if (IS_ERR(i8k_hwmon_dev)) {
--
1.7.9.5