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path: root/drivers/hwmon/dell-smm-hwmon.c
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Diffstat (limited to 'drivers/hwmon/dell-smm-hwmon.c')
-rw-r--r--drivers/hwmon/dell-smm-hwmon.c115
1 files changed, 105 insertions, 10 deletions
diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index 4212d022d253..17583bf8c2dc 100644
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -68,6 +68,8 @@ static uint i8k_pwm_mult;
static uint i8k_fan_max = I8K_FAN_HIGH;
static bool disallow_fan_type_call;
static bool disallow_fan_support;
+static unsigned int manual_fan;
+static unsigned int auto_fan;
#define I8K_HWMON_HAVE_TEMP1 (1 << 0)
#define I8K_HWMON_HAVE_TEMP2 (1 << 1)
@@ -301,6 +303,20 @@ static int i8k_get_fan_nominal_speed(int fan, int speed)
}
/*
+ * Enable or disable automatic BIOS fan control support
+ */
+static int i8k_enable_fan_auto_mode(bool enable)
+{
+ struct smm_regs regs = { };
+
+ if (disallow_fan_support)
+ return -EINVAL;
+
+ regs.eax = enable ? auto_fan : manual_fan;
+ return i8k_smm(&regs);
+}
+
+/*
* Set the fan speed (off, low, high). Returns the new fan status.
*/
static int i8k_set_fan(int fan, int speed)
@@ -726,6 +742,35 @@ static ssize_t i8k_hwmon_pwm_store(struct device *dev,
return err < 0 ? -EIO : count;
}
+static ssize_t i8k_hwmon_pwm_enable_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int err;
+ bool enable;
+ unsigned long val;
+
+ if (!auto_fan)
+ return -ENODEV;
+
+ err = kstrtoul(buf, 10, &val);
+ if (err)
+ return err;
+
+ if (val == 1)
+ enable = false;
+ else if (val == 2)
+ enable = true;
+ else
+ return -EINVAL;
+
+ mutex_lock(&i8k_mutex);
+ err = i8k_enable_fan_auto_mode(enable);
+ mutex_unlock(&i8k_mutex);
+
+ return err ? err : count;
+}
+
static SENSOR_DEVICE_ATTR_RO(temp1_input, i8k_hwmon_temp, 0);
static SENSOR_DEVICE_ATTR_RO(temp1_label, i8k_hwmon_temp_label, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_input, i8k_hwmon_temp, 1);
@@ -749,6 +794,7 @@ static SENSOR_DEVICE_ATTR_RO(temp10_label, i8k_hwmon_temp_label, 9);
static SENSOR_DEVICE_ATTR_RO(fan1_input, i8k_hwmon_fan, 0);
static SENSOR_DEVICE_ATTR_RO(fan1_label, i8k_hwmon_fan_label, 0);
static SENSOR_DEVICE_ATTR_RW(pwm1, i8k_hwmon_pwm, 0);
+static SENSOR_DEVICE_ATTR_WO(pwm1_enable, i8k_hwmon_pwm_enable, 0);
static SENSOR_DEVICE_ATTR_RO(fan2_input, i8k_hwmon_fan, 1);
static SENSOR_DEVICE_ATTR_RO(fan2_label, i8k_hwmon_fan_label, 1);
static SENSOR_DEVICE_ATTR_RW(pwm2, i8k_hwmon_pwm, 1);
@@ -780,12 +826,13 @@ static struct attribute *i8k_attrs[] = {
&sensor_dev_attr_fan1_input.dev_attr.attr, /* 20 */
&sensor_dev_attr_fan1_label.dev_attr.attr, /* 21 */
&sensor_dev_attr_pwm1.dev_attr.attr, /* 22 */
- &sensor_dev_attr_fan2_input.dev_attr.attr, /* 23 */
- &sensor_dev_attr_fan2_label.dev_attr.attr, /* 24 */
- &sensor_dev_attr_pwm2.dev_attr.attr, /* 25 */
- &sensor_dev_attr_fan3_input.dev_attr.attr, /* 26 */
- &sensor_dev_attr_fan3_label.dev_attr.attr, /* 27 */
- &sensor_dev_attr_pwm3.dev_attr.attr, /* 28 */
+ &sensor_dev_attr_pwm1_enable.dev_attr.attr, /* 23 */
+ &sensor_dev_attr_fan2_input.dev_attr.attr, /* 24 */
+ &sensor_dev_attr_fan2_label.dev_attr.attr, /* 25 */
+ &sensor_dev_attr_pwm2.dev_attr.attr, /* 26 */
+ &sensor_dev_attr_fan3_input.dev_attr.attr, /* 27 */
+ &sensor_dev_attr_fan3_label.dev_attr.attr, /* 28 */
+ &sensor_dev_attr_pwm3.dev_attr.attr, /* 29 */
NULL
};
@@ -828,16 +875,19 @@ static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP10))
return 0;
- if (index >= 20 && index <= 22 &&
+ if (index >= 20 && index <= 23 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
return 0;
- if (index >= 23 && index <= 25 &&
+ if (index >= 24 && index <= 26 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
return 0;
- if (index >= 26 && index <= 28 &&
+ if (index >= 27 && index <= 29 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN3))
return 0;
+ if (index == 23 && !auto_fan)
+ return 0;
+
return attr->mode;
}
@@ -1135,12 +1185,48 @@ static struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initdata = {
{ }
};
+struct i8k_fan_control_data {
+ unsigned int manual_fan;
+ unsigned int auto_fan;
+};
+
+enum i8k_fan_controls {
+ I8K_FAN_34A3_35A3,
+};
+
+static const struct i8k_fan_control_data i8k_fan_control_data[] = {
+ [I8K_FAN_34A3_35A3] = {
+ .manual_fan = 0x34a3,
+ .auto_fan = 0x35a3,
+ },
+};
+
+static struct dmi_system_id i8k_whitelist_fan_control[] __initdata = {
+ {
+ .ident = "Dell Precision 5530",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 5530"),
+ },
+ .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
+ },
+ {
+ .ident = "Dell Latitude E6440",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude E6440"),
+ },
+ .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
+ },
+ { }
+};
+
/*
* Probe for the presence of a supported laptop.
*/
static int __init i8k_probe(void)
{
- const struct dmi_system_id *id;
+ const struct dmi_system_id *id, *fan_control;
int fan, ret;
/*
@@ -1200,6 +1286,15 @@ static int __init i8k_probe(void)
i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
+ fan_control = dmi_first_match(i8k_whitelist_fan_control);
+ if (fan_control && fan_control->driver_data) {
+ const struct i8k_fan_control_data *data = fan_control->driver_data;
+
+ manual_fan = data->manual_fan;
+ auto_fan = data->auto_fan;
+ pr_info("enabling support for setting automatic/manual fan control\n");
+ }
+
if (!fan_mult) {
/*
* Autodetect fan multiplier based on nominal rpm