diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hwmon/ds1621.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/hwmon/ds1621.c b/drivers/hwmon/ds1621.c index 6942617666a4..b5d80fb851d0 100644 --- a/drivers/hwmon/ds1621.c +++ b/drivers/hwmon/ds1621.c @@ -274,7 +274,47 @@ static ssize_t show_alarm(struct device *dev, struct device_attribute *da, return sprintf(buf, "%d\n", !!(data->conf & attr->index)); } +static ssize_t show_convrate(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + struct ds1621_data *data = i2c_get_clientdata(client); + return scnprintf(buf, PAGE_SIZE, "%hu\n", data->update_interval); +} + +static ssize_t set_convrate(struct device *dev, struct device_attribute *da, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct ds1621_data *data = i2c_get_clientdata(client); + unsigned long convrate; + s32 err; + int resol = 0; + + err = kstrtoul(buf, 10, &convrate); + if (err) + return err; + + /* Convert rate into resolution bits */ + while (resol < (ARRAY_SIZE(ds1721_convrates) - 1) && + convrate > ds1721_convrates[resol]) + resol++; + + mutex_lock(&data->update_lock); + data->conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF); + data->conf &= ~DS1621_REG_CONFIG_RESOL; + data->conf |= (resol << DS1621_REG_CONFIG_RESOL_SHIFT); + i2c_smbus_write_byte_data(client, DS1621_REG_CONF, data->conf); + data->update_interval = ds1721_convrates[resol]; + mutex_unlock(&data->update_lock); + + return count; +} + static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); +static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_convrate, + set_convrate); + static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp, set_temp, 1); static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp, set_temp, 2); @@ -290,11 +330,27 @@ static struct attribute *ds1621_attributes[] = { &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, &dev_attr_alarms.attr, + &dev_attr_update_interval.attr, NULL }; +static umode_t ds1621_attribute_visible(struct kobject *kobj, + struct attribute *attr, int index) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct i2c_client *client = to_i2c_client(dev); + struct ds1621_data *data = i2c_get_clientdata(client); + + if (attr == &dev_attr_update_interval.attr) + if (data->kind != ds1721) + /* shhh, we're hiding update_interval */ + return 0; + return attr->mode; +} + static const struct attribute_group ds1621_group = { .attrs = ds1621_attributes, + .is_visible = ds1621_attribute_visible }; |