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path: root/drivers/hwmon/hwmon.c
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Diffstat (limited to 'drivers/hwmon/hwmon.c')
-rw-r--r--drivers/hwmon/hwmon.c33
1 files changed, 31 insertions, 2 deletions
diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index a74c075a30ec..491231fa0580 100644
--- a/drivers/hwmon/hwmon.c
+++ b/drivers/hwmon/hwmon.c
@@ -178,6 +178,22 @@ static ssize_t hwmon_attr_show(struct device *dev,
return sprintf(buf, "%ld\n", val);
}
+static ssize_t hwmon_attr_show_string(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
+ char *s;
+ int ret;
+
+ ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
+ hattr->index, &s);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%s\n", s);
+}
+
static ssize_t hwmon_attr_store(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
@@ -205,6 +221,17 @@ static int hwmon_attr_base(enum hwmon_sensor_types type)
return 1;
}
+static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
+{
+ return (type == hwmon_temp && attr == hwmon_temp_label) ||
+ (type == hwmon_in && attr == hwmon_in_label) ||
+ (type == hwmon_curr && attr == hwmon_curr_label) ||
+ (type == hwmon_power && attr == hwmon_power_label) ||
+ (type == hwmon_energy && attr == hwmon_energy_label) ||
+ (type == hwmon_humidity && attr == hwmon_humidity_label) ||
+ (type == hwmon_fan && attr == hwmon_fan_label);
+}
+
static struct attribute *hwmon_genattr(struct device *dev,
const void *drvdata,
enum hwmon_sensor_types type,
@@ -218,6 +245,7 @@ static struct attribute *hwmon_genattr(struct device *dev,
struct attribute *a;
umode_t mode;
char *name;
+ bool is_string = is_string_attr(type, attr);
/* The attribute is invisible if there is no template string */
if (!template)
@@ -227,7 +255,8 @@ static struct attribute *hwmon_genattr(struct device *dev,
if (!mode)
return ERR_PTR(-ENOENT);
- if ((mode & S_IRUGO) && !ops->read)
+ if ((mode & S_IRUGO) && ((is_string && !ops->read_string) ||
+ (!is_string && !ops->read)))
return ERR_PTR(-EINVAL);
if ((mode & S_IWUGO) && !ops->write)
return ERR_PTR(-EINVAL);
@@ -252,7 +281,7 @@ static struct attribute *hwmon_genattr(struct device *dev,
hattr->ops = ops;
dattr = &hattr->dev_attr;
- dattr->show = hwmon_attr_show;
+ dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;
dattr->store = hwmon_attr_store;
a = &dattr->attr;