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hwmon: (w83791d) add manual PWM support

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Add PWM manual control.

Signed-off-by: Marc Hulsman <m.hulsman@tudelft.nl>
Acked-by: Hans de Goede <j.w.r.degoede@hhs.nl>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Marc Hulsman 2008-10-17 17:51:17 +02:00 committed by Jean Delvare
parent 6e1ecd9b8f
commit 6495ce1840
2 changed files with 75 additions and 7 deletions
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15
Documentation/hwmon/w83791d
View file

@ -58,29 +58,32 @@ internal state that allows no clean access (Bank with ID register is not
currently selected). If you know the address of the chip, use a 'force'
parameter; this will put it into a more well-behaved state first.
The driver implements three temperature sensors, five fan rotation speed
sensors, and ten voltage sensors.
The driver implements three temperature sensors, ten voltage sensors,
five fan rotation speed sensors and manual PWM control of each fan.
Temperatures are measured in degrees Celsius and measurement resolution is 1
degC for temp1 and 0.5 degC for temp2 and temp3. An alarm is triggered when
the temperature gets higher than the Overtemperature Shutdown value; it stays
on until the temperature falls below the Hysteresis value.
Voltage sensors (also known as IN sensors) report their values in millivolts.
An alarm is triggered if the voltage has crossed a programmable minimum
or maximum limit.
Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
triggered if the rotation speed has dropped below a programmable limit. Fan
readings can be divided by a programmable divider (1, 2, 4, 8, 16,
32, 64 or 128 for all fans) to give the readings more range or accuracy.
Voltage sensors (also known as IN sensors) report their values in millivolts.
An alarm is triggered if the voltage has crossed a programmable minimum
or maximum limit.
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).
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
specific alarms. You need both the global beep enable bit and the
corresponding beep bit to be on for a triggered alarm to sound a beep.
The sysfs interface to the gloabal enable is via the sysfs beep_enable file.
The sysfs interface to the global enable is via the sysfs beep_enable file.
This file is used for both legacy and new code.
The sysfs interface to the beep bitmask has migrated from the original legacy

67
drivers/hwmon/w83791d.c
View file

@ -23,7 +23,7 @@
Supports following chips:
Chip #vin #fanin #pwm #temp wchipid vendid i2c ISA
w83791d 10 5 3 3 0x71 0x5ca3 yes no
w83791d 10 5 5 3 0x71 0x5ca3 yes no
The w83791d chip appears to be part way between the 83781d and the
83792d. Thus, this file is derived from both the w83792d.c and
@ -45,6 +45,7 @@
#define NUMBER_OF_VIN 10
#define NUMBER_OF_FANIN 5
#define NUMBER_OF_TEMPIN 3
#define NUMBER_OF_PWM 5
/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
@ -116,6 +117,14 @@ static const u8 W83791D_REG_FAN_MIN[NUMBER_OF_FANIN] = {
0xBD, /* FAN 5 Count Low Limit in DataSheet */
};
static const u8 W83791D_REG_PWM[NUMBER_OF_PWM] = {
0x81, /* PWM 1 duty cycle register in DataSheet */
0x83, /* PWM 2 duty cycle register in DataSheet */
0x94, /* PWM 3 duty cycle register in DataSheet */
0xA0, /* PWM 4 duty cycle register in DataSheet */
0xA1, /* PWM 5 duty cycle register in DataSheet */
};
static const u8 W83791D_REG_FAN_CFG[2] = {
0x84, /* FAN 1/2 configuration */
0x95, /* FAN 3 configuration */
@ -276,6 +285,9 @@ struct w83791d_data {
two sensors with three values
(cur, over, hyst) */
/* PWMs */
u8 pwm[5]; /* pwm duty cycle */
/* Misc */
u32 alarms; /* realtime status register encoding,combined */
u8 beep_enable; /* Global beep enable */
@ -653,6 +665,48 @@ static struct sensor_device_attribute sda_fan_alarm[] = {
SENSOR_ATTR(fan5_alarm, S_IRUGO, show_alarm, NULL, 22),
};
/* read/write PWMs */
static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
int nr = sensor_attr->index;
struct w83791d_data *data = w83791d_update_device(dev);
return sprintf(buf, "%u\n", data->pwm[nr]);
}
static ssize_t store_pwm(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;
if (strict_strtoul(buf, 10, &val))
return -EINVAL;
mutex_lock(&data->update_lock);
data->pwm[nr] = SENSORS_LIMIT(val, 0, 255);
w83791d_write(client, W83791D_REG_PWM[nr], data->pwm[nr]);
mutex_unlock(&data->update_lock);
return count;
}
static struct sensor_device_attribute sda_pwm[] = {
SENSOR_ATTR(pwm1, S_IWUSR | S_IRUGO,
show_pwm, store_pwm, 0),
SENSOR_ATTR(pwm2, S_IWUSR | S_IRUGO,
show_pwm, store_pwm, 1),
SENSOR_ATTR(pwm3, S_IWUSR | S_IRUGO,
show_pwm, store_pwm, 2),
SENSOR_ATTR(pwm4, S_IWUSR | S_IRUGO,
show_pwm, store_pwm, 3),
SENSOR_ATTR(pwm5, S_IWUSR | S_IRUGO,
show_pwm, store_pwm, 4),
};
/* read/write the temperature1, includes measured value and limits */
static ssize_t show_temp1(struct device *dev, struct device_attribute *devattr,
char *buf)
@ -917,6 +971,9 @@ static struct attribute *w83791d_attributes[] = {
&sda_beep_ctrl[1].dev_attr.attr,
&dev_attr_cpu0_vid.attr,
&dev_attr_vrm.attr,
&sda_pwm[0].dev_attr.attr,
&sda_pwm[1].dev_attr.attr,
&sda_pwm[2].dev_attr.attr,
NULL
};
@ -930,6 +987,8 @@ static const struct attribute_group w83791d_group = {
static struct attribute *w83791d_attributes_fanpwm45[] = {
FAN_UNIT_ATTRS(3),
FAN_UNIT_ATTRS(4),
&sda_pwm[3].dev_attr.attr,
&sda_pwm[4].dev_attr.attr,
NULL
};
@ -1260,6 +1319,12 @@ static struct w83791d_data *w83791d_update_device(struct device *dev)
for (i = 0; i < 3; i++)
data->fan_div[i] |= (vbat_reg >> (3 + i)) & 0x04;
/* Update PWM duty cycle */
for (i = 0; i < NUMBER_OF_PWM; i++) {
data->pwm[i] = w83791d_read(client,
W83791D_REG_PWM[i]);
}
/* Update the first temperature sensor */
for (i = 0; i < 3; i++) {
data->temp1[i] = w83791d_read(client,