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hwmon/f71805f: Let the user adjust the PWM base frequency 

Different frequencies can give better results depending on the exact fan
model used.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Jean Delvare 2006-12-12 18:18:27 +01:00 committed by Jean Delvare
parent 95e353127d
commit 6e2bc17b07
1 changed files with 62 additions and 1 deletions
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63
drivers/hwmon/f71805f.c
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@ -112,6 +112,7 @@ superio_exit(int base)
#define F71805F_REG_FAN(nr) (0x20 + 2 * (nr))
#define F71805F_REG_FAN_LOW(nr) (0x28 + 2 * (nr))
#define F71805F_REG_FAN_CTRL(nr) (0x60 + 16 * (nr))
#define F71805F_REG_PWM_FREQ(nr) (0x63 + 16 * (nr))
#define F71805F_REG_PWM_DUTY(nr) (0x6B + 16 * (nr))
/* temp nr from 0 to 2 (8-bit values) */
#define F71805F_REG_TEMP(nr) (0x1B + (nr))
@ -153,6 +154,7 @@ struct f71805f_data {
u16 fan_low[3];
u8 fan_ctrl[3];
u8 pwm[3];
u8 pwm_freq[3];
u8 temp[3];
u8 temp_high[3];
u8 temp_hyst[3];
@ -209,6 +211,28 @@ static inline u16 fan_to_reg(long rpm)
return (1500000 / rpm);
}
static inline unsigned long pwm_freq_from_reg(u8 reg)
{
unsigned long clock = (reg & 0x80) ? 48000000UL : 1000000UL;
reg &= 0x7f;
if (reg == 0)
reg++;
return clock / (reg << 8);
}
static inline u8 pwm_freq_to_reg(unsigned long val)
{
if (val >= 187500) /* The highest we can do */
return 0x80;
if (val >= 1475) /* Use 48 MHz clock */
return 0x80 | (48000000UL / (val << 8));
if (val < 31) /* The lowest we can do */
return 0x7f;
else /* Use 1 MHz clock */
return 1000000UL / (val << 8);
}
static inline long temp_from_reg(u8 reg)
{
return (reg * 1000);
@ -294,6 +318,8 @@ static struct f71805f_data *f71805f_update_device(struct device *dev)
continue;
data->fan_low[nr] = f71805f_read16(data,
F71805F_REG_FAN_LOW(nr));
data->pwm_freq[nr] = f71805f_read8(data,
F71805F_REG_PWM_FREQ(nr));
}
for (nr = 0; nr < 3; nr++) {
data->temp_high[nr] = f71805f_read8(data,
@ -526,6 +552,16 @@ static ssize_t show_pwm_enable(struct device *dev, struct device_attribute
return sprintf(buf, "%d\n", mode);
}
static ssize_t show_pwm_freq(struct device *dev, struct device_attribute
*devattr, char *buf)
{
struct f71805f_data *data = f71805f_update_device(dev);
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
int nr = attr->index;
return sprintf(buf, "%lu\n", pwm_freq_from_reg(data->pwm_freq[nr]));
}
static ssize_t set_pwm(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
@ -592,6 +628,22 @@ static ssize_t set_pwm_enable(struct device *dev, struct device_attribute
return count;
}
static ssize_t set_pwm_freq(struct device *dev, struct device_attribute
*devattr, const char *buf, size_t count)
{
struct f71805f_data *data = dev_get_drvdata(dev);
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
int nr = attr->index;
unsigned long val = simple_strtoul(buf, NULL, 10);
mutex_lock(&data->update_lock);
data->pwm_freq[nr] = pwm_freq_to_reg(val);
f71805f_write8(data, F71805F_REG_PWM_FREQ(nr), data->pwm_freq[nr]);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
char *buf)
{
@ -785,12 +837,18 @@ static SENSOR_DEVICE_ATTR(temp3_type, S_IRUGO, show_temp_type, NULL, 2);
static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO, show_pwm, set_pwm, 0);
static SENSOR_DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
show_pwm_enable, set_pwm_enable, 0);
static SENSOR_DEVICE_ATTR(pwm1_freq, S_IRUGO | S_IWUSR,
show_pwm_freq, set_pwm_freq, 0);
static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO, show_pwm, set_pwm, 1);
static SENSOR_DEVICE_ATTR(pwm2_enable, S_IRUGO | S_IWUSR,
show_pwm_enable, set_pwm_enable, 1);
static SENSOR_DEVICE_ATTR(pwm2_freq, S_IRUGO | S_IWUSR,
show_pwm_freq, set_pwm_freq, 1);
static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO, show_pwm, set_pwm, 2);
static SENSOR_DEVICE_ATTR(pwm3_enable, S_IRUGO | S_IWUSR,
show_pwm_enable, set_pwm_enable, 2);
static SENSOR_DEVICE_ATTR(pwm3_freq, S_IRUGO | S_IWUSR,
show_pwm_freq, set_pwm_freq, 2);
static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
@ -879,13 +937,14 @@ static const struct attribute_group f71805f_group = {
.attrs = f71805f_attributes,
};
static struct attribute *f71805f_attributes_fan[3][6] = {
static struct attribute *f71805f_attributes_fan[3][7] = {
{
&sensor_dev_attr_fan1_input.dev_attr.attr,
&sensor_dev_attr_fan1_min.dev_attr.attr,
&sensor_dev_attr_fan1_alarm.dev_attr.attr,
&sensor_dev_attr_pwm1.dev_attr.attr,
&sensor_dev_attr_pwm1_enable.dev_attr.attr,
&sensor_dev_attr_pwm1_freq.dev_attr.attr,
NULL
}, {
&sensor_dev_attr_fan2_input.dev_attr.attr,
@ -893,6 +952,7 @@ static struct attribute *f71805f_attributes_fan[3][6] = {
&sensor_dev_attr_fan2_alarm.dev_attr.attr,
&sensor_dev_attr_pwm2.dev_attr.attr,
&sensor_dev_attr_pwm2_enable.dev_attr.attr,
&sensor_dev_attr_pwm2_freq.dev_attr.attr,
NULL
}, {
&sensor_dev_attr_fan3_input.dev_attr.attr,
@ -900,6 +960,7 @@ static struct attribute *f71805f_attributes_fan[3][6] = {
&sensor_dev_attr_fan3_alarm.dev_attr.attr,
&sensor_dev_attr_pwm3.dev_attr.attr,
&sensor_dev_attr_pwm3_enable.dev_attr.attr,
&sensor_dev_attr_pwm3_freq.dev_attr.attr,
NULL
}
};