diff options
Diffstat (limited to 'drivers/hwmon/it87.c')
| -rw-r--r-- | drivers/hwmon/it87.c | 56 |
1 files changed, 54 insertions, 2 deletions
diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c index 1ed8b7e2c35d..bb16668ad2bd 100644 --- a/drivers/hwmon/it87.c +++ b/drivers/hwmon/it87.c @@ -202,6 +202,17 @@ static int DIV_TO_REG(int val) } #define DIV_FROM_REG(val) (1 << (val)) +static const unsigned int pwm_freq[8] = { + 48000000 / 128, + 24000000 / 128, + 12000000 / 128, + 8000000 / 128, + 6000000 / 128, + 3000000 / 128, + 1500000 / 128, + 750000 / 128, +}; + /* For each registered IT87, we need to keep some data in memory. That data is pointed to by it87_list[NR]->data. The structure itself is @@ -232,6 +243,7 @@ struct it87_data { u8 vrm; u32 alarms; /* Register encoding, combined */ u8 fan_main_ctrl; /* Register value */ + u8 fan_ctl; /* Register value */ u8 manual_pwm_ctl[3]; /* manual PWM value set by user */ }; @@ -519,6 +531,14 @@ static ssize_t show_pwm(struct device *dev, struct device_attribute *attr, struct it87_data *data = it87_update_device(dev); return sprintf(buf,"%d\n", data->manual_pwm_ctl[nr]); } +static ssize_t show_pwm_freq(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct it87_data *data = it87_update_device(dev); + int index = (data->fan_ctl >> 4) & 0x07; + + return sprintf(buf, "%u\n", pwm_freq[index]); +} static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { @@ -639,6 +659,28 @@ static ssize_t set_pwm(struct device *dev, struct device_attribute *attr, mutex_unlock(&data->update_lock); return count; } +static ssize_t set_pwm_freq(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct it87_data *data = i2c_get_clientdata(client); + unsigned long val = simple_strtoul(buf, NULL, 10); + int i; + + /* Search for the nearest available frequency */ + for (i = 0; i < 7; i++) { + if (val > (pwm_freq[i] + pwm_freq[i+1]) / 2) + break; + } + + mutex_lock(&data->update_lock); + data->fan_ctl = it87_read_value(client, IT87_REG_FAN_CTL) & 0x8f; + data->fan_ctl |= i << 4; + it87_write_value(client, IT87_REG_FAN_CTL, data->fan_ctl); + mutex_unlock(&data->update_lock); + + return count; +} #define show_fan_offset(offset) \ static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \ @@ -656,7 +698,10 @@ show_fan_offset(3); static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR, \ show_pwm_enable, set_pwm_enable, offset - 1); \ static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR, \ - show_pwm, set_pwm, offset - 1); + show_pwm, set_pwm, offset - 1); \ +static DEVICE_ATTR(pwm##offset##_freq, \ + (offset == 1 ? S_IRUGO | S_IWUSR : S_IRUGO), \ + show_pwm_freq, (offset == 1 ? set_pwm_freq : NULL)); show_pwm_offset(1); show_pwm_offset(2); @@ -1021,7 +1066,13 @@ static int it87_detect(struct i2c_adapter *adapter) || (err = device_create_file(&new_client->dev, &sensor_dev_attr_pwm2.dev_attr)) || (err = device_create_file(&new_client->dev, - &sensor_dev_attr_pwm3.dev_attr))) + &sensor_dev_attr_pwm3.dev_attr)) + || (err = device_create_file(&new_client->dev, + &dev_attr_pwm1_freq)) + || (err = device_create_file(&new_client->dev, + &dev_attr_pwm2_freq)) + || (err = device_create_file(&new_client->dev, + &dev_attr_pwm3_freq))) goto ERROR4; } @@ -1316,6 +1367,7 @@ static struct it87_data *it87_update_device(struct device *dev) (it87_read_value(client, IT87_REG_ALARM2) << 8) | (it87_read_value(client, IT87_REG_ALARM3) << 16); data->fan_main_ctrl = it87_read_value(client, IT87_REG_FAN_MAIN_CTRL); + data->fan_ctl = it87_read_value(client, IT87_REG_FAN_CTL); data->sensor = it87_read_value(client, IT87_REG_TEMP_ENABLE); /* The 8705 does not have VID capability */ |