diff options
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/it87.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c index bbb0c7443b9..1002befd87d 100644 --- a/drivers/hwmon/it87.c +++ b/drivers/hwmon/it87.c @@ -719,6 +719,32 @@ static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr, mutex_unlock(&data->update_lock); return count; } + +/* Returns 0 if OK, -EINVAL otherwise */ +static int check_trip_points(struct device *dev, int nr) +{ + const struct it87_data *data = dev_get_drvdata(dev); + int i, err = 0; + + if (has_old_autopwm(data)) { + for (i = 0; i < 3; i++) { + if (data->auto_temp[nr][i] > data->auto_temp[nr][i + 1]) + err = -EINVAL; + } + for (i = 0; i < 2; i++) { + if (data->auto_pwm[nr][i] > data->auto_pwm[nr][i + 1]) + err = -EINVAL; + } + } + + if (err) { + dev_err(dev, "Inconsistent trip points, not switching to " + "automatic mode\n"); + dev_err(dev, "Adjust the trip points and try again\n"); + } + return err; +} + static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { @@ -731,6 +757,12 @@ static ssize_t set_pwm_enable(struct device *dev, if (strict_strtol(buf, 10, &val) < 0 || val < 0 || val > 2) return -EINVAL; + /* Check trip points before switching to automatic mode */ + if (val == 2) { + if (check_trip_points(dev, nr) < 0) + return -EINVAL; + } + mutex_lock(&data->update_lock); if (val == 0) { |