Last patch in the series. Adds support for automatic PWM control using smart
fan 1 thermal cruise mode. Fan speed cruise mode shares registers with
thermal cruise mode which makes implementing it a bit more complicated. As it
does not add much over manual PWM control I did not implement it (for now?).
Marc
PS: I will be away from my mail during the next two weeks.
PS2: When is it possible to remove the 'EXPERIMENTAL' status of the driver?
---
Adds support to set target temperature and tolerance for thermal cruise mode.
Signed-off-by: Marc Hulsman <m.hulsman at tudelft.nl>
---
Documentation/hwmon/w83791d | 19 ++++-
drivers/hwmon/w83791d.c | 150
++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 164 insertions(+), 5 deletions(-)
---
Index: linux-2.6.27-rc1/drivers/hwmon/w83791d.c
===================================================================
--- linux-2.6.27-rc1.orig/drivers/hwmon/w83791d.c
+++ linux-2.6.27-rc1/drivers/hwmon/w83791d.c
@@ -125,6 +125,17 @@ static const u8 W83791D_REG_PWM[NUMBER_O
0xA1, /* PWM 5 duty cycle register in DataSheet */
};
+static const u8 W83791D_REG_PWM_TARGET[3] = {
+ 0x85, /* PWM 1 target temperature for temp 1 */
+ 0x86, /* PWM 2 target temperature for temp 2*/
+ 0x96, /* PWM 3 target temperature for temp 3*/
+};
+
+static const u8 W83791D_REG_PWM_TOL[2] = {
+ 0x87, /* PWM 1/2 temperature tolerance */
+ 0x97, /* PWM 3 temperature tolerance */
+};
+
static const u8 W83791D_REG_FAN_CFG[2] = {
0x84, /* FAN 1/2 configuration */
0x95, /* FAN 3 configuration */
@@ -234,6 +245,17 @@ static u8 fan_to_reg(long rpm, int div)
(val) < 0 ? ((val) - 250) / 500 * 128 : \
((val) + 250) / 500 * 128)
+/* for thermal cruise target temp, 7-bits, LSB = 1 degree Celsius */
+#define TARGET_TEMP_FROM_REG(val) ((val) * 1000)
+#define TARGET_TEMP_TO_REG(val) ((val) < 0 ? 0 : \
+ (val) >= 127000 ? 127 : \
+ ((val) + 500) / 1000)
+
+/* for thermal cruise temp tolerance, 4-bits, LSB = 1 degree Celsius */
+#define TOL_TEMP_FROM_REG(val) ((val) * 1000)
+#define TOL_TEMP_TO_REG(val) ((val) < 0 ? 0 : \
+ (val) >= 15000 ? 15 : \
+ ((val) + 500) / 1000)
#define BEEP_MASK_TO_REG(val) ((val) & 0xffffff)
#define BEEP_MASK_FROM_REG(val) ((val) & 0xffffff)
@@ -290,6 +312,9 @@ struct w83791d_data {
u8 pwm_enable[3]; /* pwm enable status for fan 1-3
(fan 4-5 only support manual mode) */
+ u8 pwm_target[3]; /* pwm 1-3 target temperature */
+ u8 pwm_tolerance[3]; /* pwm 1-3 temperature tolerance */
+
/* Misc */
u32 alarms; /* realtime status register encoding,combined */
u8 beep_enable; /* Global beep enable */
@@ -774,6 +799,110 @@ static struct sensor_device_attribute sd
show_pwmenable, store_pwmenable, 2),
};
+/* For Smart Fan I / Thermal Cruise */
+static ssize_t show_pwm_target(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+ struct w83791d_data *data = w83791d_update_device(dev);
+ int nr = sensor_attr->index;
+ return sprintf(buf, "%d\n", TARGET_TEMP_FROM_REG(data->pwm_target[nr]));
+}
+
+static ssize_t store_pwm_target(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+ struct i2c_client *client = to_i2c_client(dev);
+ struct w83791d_data *data = i2c_get_clientdata(client);
+ int nr = sensor_attr->index;
+ unsigned long val;
+ u8 target_mask;
+
+ if (strict_strtoul(buf, 10, &val))
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+ data->pwm_target[nr] = TARGET_TEMP_TO_REG(val);
+ target_mask = w83791d_read(client,
+ W83791D_REG_PWM_TARGET[nr]) & 0x80;
+ w83791d_write(client, W83791D_REG_PWM_TARGET[nr],
+ data->pwm_target[nr] | target_mask);
+ mutex_unlock(&data->update_lock);
+ return count;
+}
+
+static struct sensor_device_attribute sda_pwm_target[] = {
+ SENSOR_ATTR(pwm1_target, S_IWUSR | S_IRUGO,
+ show_pwm_target, store_pwm_target, 0),
+ SENSOR_ATTR(pwm2_target, S_IWUSR | S_IRUGO,
+ show_pwm_target, store_pwm_target, 1),
+ SENSOR_ATTR(pwm3_target, S_IWUSR | S_IRUGO,
+ show_pwm_target, store_pwm_target, 2),
+};
+
+static ssize_t show_pwm_tolerance(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+ struct w83791d_data *data = w83791d_update_device(dev);
+ int nr = sensor_attr->index;
+ return sprintf(buf, "%d\n", TOL_TEMP_FROM_REG(data->pwm_tolerance[nr]));
+}
+
+static ssize_t store_pwm_tolerance(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+ struct i2c_client *client = to_i2c_client(dev);
+ struct w83791d_data *data = i2c_get_clientdata(client);
+ int nr = sensor_attr->index;
+ unsigned long val;
+ u8 target_mask;
+ u8 reg_idx = 0;
+ u8 val_shift = 0;
+ u8 keep_mask = 0;
+
+ if (strict_strtoul(buf, 10, &val))
+ return -EINVAL;
+
+ switch (nr) {
+ case 0:
+ reg_idx = 0;
+ val_shift = 0;
+ keep_mask = 0xf0;
+ break;
+ case 1:
+ reg_idx = 0;
+ val_shift = 4;
+ keep_mask = 0x0f;
+ break;
+ case 2:
+ reg_idx = 1;
+ val_shift = 0;
+ keep_mask = 0xf0;
+ break;
+ }
+
+ mutex_lock(&data->update_lock);
+ data->pwm_tolerance[nr] = TOL_TEMP_TO_REG(val);
+ target_mask = w83791d_read(client,
+ W83791D_REG_PWM_TOL[reg_idx]) & keep_mask;
+ w83791d_write(client, W83791D_REG_PWM_TOL[reg_idx],
+ (data->pwm_tolerance[nr] << val_shift) | target_mask);
+ mutex_unlock(&data->update_lock);
+ return count;
+}
+
+static struct sensor_device_attribute sda_pwm_tolerance[] = {
+ SENSOR_ATTR(pwm1_tolerance, S_IWUSR | S_IRUGO,
+ show_pwm_tolerance, store_pwm_tolerance, 0),
+ SENSOR_ATTR(pwm2_tolerance, S_IWUSR | S_IRUGO,
+ show_pwm_tolerance, store_pwm_tolerance, 1),
+ SENSOR_ATTR(pwm3_tolerance, S_IWUSR | S_IRUGO,
+ show_pwm_tolerance, store_pwm_tolerance, 2),
+};
+
/* read/write the temperature1, includes measured value and limits */
static ssize_t show_temp1(struct device *dev, struct device_attribute
*devattr,
char *buf)
@@ -1044,6 +1173,12 @@ static struct attribute *w83791d_attribu
&sda_pwmenable[0].dev_attr.attr,
&sda_pwmenable[1].dev_attr.attr,
&sda_pwmenable[2].dev_attr.attr,
+ &sda_pwm_target[0].dev_attr.attr,
+ &sda_pwm_target[1].dev_attr.attr,
+ &sda_pwm_target[2].dev_attr.attr,
+ &sda_pwm_tolerance[0].dev_attr.attr,
+ &sda_pwm_tolerance[1].dev_attr.attr,
+ &sda_pwm_tolerance[2].dev_attr.attr,
NULL
};
@@ -1403,6 +1538,21 @@ static struct w83791d_data *w83791d_upda
data->pwm_enable[1] = ((reg_array_tmp[0] >> 4) & 0x03) + 1;
data->pwm_enable[2] = ((reg_array_tmp[1] >> 2) & 0x03) + 1;
+ /* Update PWM target temperature */
+ for (i = 0; i < 2; i++) {
+ data->pwm_target[i] = w83791d_read(client,
+ W83791D_REG_PWM_TARGET[i]) & 0x7f;
+ }
+
+ /* Update PWM temperature tolerance */
+ for (i = 0; i < 1; i++) {
+ reg_array_tmp[i] = w83791d_read(client,
+ W83791D_REG_PWM_TOL[i]);
+ }
+ data->pwm_tolerance[0] = reg_array_tmp[0] & 0x0f;
+ data->pwm_tolerance[1] = (reg_array_tmp[0] >> 4) & 0x0f;
+ data->pwm_tolerance[2] = reg_array_tmp[1] & 0x0f;
+
/* Update the first temperature sensor */
for (i = 0; i < 3; i++) {
data->temp1[i] = w83791d_read(client,
Index: linux-2.6.27-rc1/Documentation/hwmon/w83791d
===================================================================
--- linux-2.6.27-rc1.orig/Documentation/hwmon/w83791d
+++ linux-2.6.27-rc1/Documentation/hwmon/w83791d
@@ -77,6 +77,9 @@ readings can be divided by a programmabl
Each fan controlled is controlled by PWM. The PWM duty cycle can be read and
set for each fan separately. Valid values range from 0 (stop) to 255 (full).
+PWM 1-3 support Thermal Cruise mode, in which the PWMs are automatically
+regulated to keep respectively temp 1-3 at a certain target temperature.
+See below for the description of the sysfs-interface.
The w83791d has a global bit used to enable beeping from the speaker when an
alarm is triggered as well as a bitmask to enable or disable the beep for
@@ -116,9 +119,19 @@ chip-specific options are documented her
pwm[1-3]_enable - this file controls mode of fan/temperature control for
fan 1-3. Fan/PWM 4-5 only support manual mode.
* 1 Manual mode
- * 2 Thermal Cruise mode (no further support)
+ * 2 Thermal Cruise mode
* 3 Fan Speed Cruise mode (no further support)
+pwm[1-3]_target - defines the target temperature for Thermal Cruise mode.
+ Unit: millidegree Celsius
+ RW
+
+pwm[1-3]_tolerance - temperature tolerance for Thermal Cruise mode.
+ Specifies an interval around the target temperature
+ in which the fan speed is not changed.
+ Unit: millidegree Celsius
+ RW
+
Alarms bitmap vs. beep_mask bitmask
------------------------------------
For legacy code using the alarms and beep_mask files:
@@ -146,7 +159,3 @@ tart2 : alarms: 0x020000 beep_ma
tart3 : alarms: 0x040000 beep_mask: 0x100000 <== mismatch
case_open : alarms: 0x001000 beep_mask: 0x001000
global_enable: alarms: -------- beep_mask: 0x800000 (modified via
beep_enable)
-
-W83791D TODO:
----------------
-Provide a patch for Thermal Cruise registers.
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