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authorGuenter Roeck <linux@roeck-us.net>2016-08-07 20:51:25 -0700
committerGuenter Roeck <linux@roeck-us.net>2016-12-09 21:54:16 -0800
commite159ab5cb1afb519601a961405933c61cdd5a56a (patch)
tree91cd9bcdfd7910257d29023341a7fdf2fd0007a1 /drivers/hwmon
parentf680b2845694a197e7bfc9f56b241f9a3f17296e (diff)
hwmon: (core) Add support for string attributes to new API
The new API is so far only suited for data attributes and does not work well for string attributes, specifically for the 'label' attributes. Provide a separate callback function for those. Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
-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;