#include <linux/module.h>
#include <linux/device.h>
#include <linux/err.h>
+#include <linux/slab.h>
#include <linux/kdev_t.h>
#include <linux/idr.h>
#include <linux/hwmon.h>
#define HWMON_ID_PREFIX "hwmon"
#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
-static struct class *hwmon_class;
+struct hwmon_device {
+ const char *name;
+ struct device dev;
+};
+#define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)
+
+static ssize_t
+show_name(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
+}
+static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
+
+static struct attribute *hwmon_dev_attrs[] = {
+ &dev_attr_name.attr,
+ NULL
+};
+
+static umode_t hwmon_dev_name_is_visible(struct kobject *kobj,
+ struct attribute *attr, int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+
+ if (to_hwmon_device(dev)->name == NULL)
+ return 0;
+
+ return attr->mode;
+}
+
+static struct attribute_group hwmon_dev_attr_group = {
+ .attrs = hwmon_dev_attrs,
+ .is_visible = hwmon_dev_name_is_visible,
+};
+
+static const struct attribute_group *hwmon_dev_attr_groups[] = {
+ &hwmon_dev_attr_group,
+ NULL
+};
+
+static void hwmon_dev_release(struct device *dev)
+{
+ kfree(to_hwmon_device(dev));
+}
+
+static struct class hwmon_class = {
+ .name = "hwmon",
+ .owner = THIS_MODULE,
+ .dev_groups = hwmon_dev_attr_groups,
+ .dev_release = hwmon_dev_release,
+};
static DEFINE_IDA(hwmon_ida);
/**
- * hwmon_device_register - register w/ hwmon
- * @dev: the device to register
+ * hwmon_device_register_with_groups - register w/ hwmon
+ * @dev: the parent device
+ * @name: hwmon name attribute
+ * @drvdata: driver data to attach to created device
+ * @groups: List of attribute groups to create
*
* hwmon_device_unregister() must be called when the device is no
* longer needed.
*
* Returns the pointer to the new device.
*/
-struct device *hwmon_device_register(struct device *dev)
+struct device *
+hwmon_device_register_with_groups(struct device *dev, const char *name,
+ void *drvdata,
+ const struct attribute_group **groups)
{
- struct device *hwdev;
- int id;
+ struct hwmon_device *hwdev;
+ int err, id;
id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
if (id < 0)
return ERR_PTR(id);
- hwdev = device_create(hwmon_class, dev, MKDEV(0, 0), NULL,
- HWMON_ID_FORMAT, id);
+ hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
+ if (hwdev == NULL) {
+ err = -ENOMEM;
+ goto ida_remove;
+ }
- if (IS_ERR(hwdev))
- ida_simple_remove(&hwmon_ida, id);
+ hwdev->name = name;
+ hwdev->dev.class = &hwmon_class;
+ hwdev->dev.parent = dev;
+ hwdev->dev.groups = groups;
+ hwdev->dev.of_node = dev ? dev->of_node : NULL;
+ dev_set_drvdata(&hwdev->dev, drvdata);
+ dev_set_name(&hwdev->dev, HWMON_ID_FORMAT, id);
+ err = device_register(&hwdev->dev);
+ if (err)
+ goto free;
- return hwdev;
+ return &hwdev->dev;
+
+free:
+ kfree(hwdev);
+ida_remove:
+ ida_simple_remove(&hwmon_ida, id);
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
+
+/**
+ * hwmon_device_register - register w/ hwmon
+ * @dev: the device to register
+ *
+ * hwmon_device_unregister() must be called when the device is no
+ * longer needed.
+ *
+ * Returns the pointer to the new device.
+ */
+struct device *hwmon_device_register(struct device *dev)
+{
+ return hwmon_device_register_with_groups(dev, NULL, NULL, NULL);
}
EXPORT_SYMBOL_GPL(hwmon_device_register);
}
EXPORT_SYMBOL_GPL(hwmon_device_unregister);
+static void devm_hwmon_release(struct device *dev, void *res)
+{
+ struct device *hwdev = *(struct device **)res;
+
+ hwmon_device_unregister(hwdev);
+}
+
+/**
+ * devm_hwmon_device_register_with_groups - register w/ hwmon
+ * @dev: the parent device
+ * @name: hwmon name attribute
+ * @drvdata: driver data to attach to created device
+ * @groups: List of attribute groups to create
+ *
+ * Returns the pointer to the new device. The new device is automatically
+ * unregistered with the parent device.
+ */
+struct device *
+devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
+ void *drvdata,
+ const struct attribute_group **groups)
+{
+ struct device **ptr, *hwdev;
+
+ if (!dev)
+ return ERR_PTR(-EINVAL);
+
+ ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
+ if (IS_ERR(hwdev))
+ goto error;
+
+ *ptr = hwdev;
+ devres_add(dev, ptr);
+ return hwdev;
+
+error:
+ devres_free(ptr);
+ return hwdev;
+}
+EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
+
+static int devm_hwmon_match(struct device *dev, void *res, void *data)
+{
+ struct device **hwdev = res;
+
+ return *hwdev == data;
+}
+
+/**
+ * devm_hwmon_device_unregister - removes a previously registered hwmon device
+ *
+ * @dev: the parent device of the device to unregister
+ */
+void devm_hwmon_device_unregister(struct device *dev)
+{
+ WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
+}
+EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
+
static void __init hwmon_pci_quirks(void)
{
#if defined CONFIG_X86 && defined CONFIG_PCI
static int __init hwmon_init(void)
{
+ int err;
+
hwmon_pci_quirks();
- hwmon_class = class_create(THIS_MODULE, "hwmon");
- if (IS_ERR(hwmon_class)) {
- pr_err("couldn't create sysfs class\n");
- return PTR_ERR(hwmon_class);
+ err = class_register(&hwmon_class);
+ if (err) {
+ pr_err("couldn't register hwmon sysfs class\n");
+ return err;
}
return 0;
}
static void __exit hwmon_exit(void)
{
- class_destroy(hwmon_class);
+ class_unregister(&hwmon_class);
}
subsys_initcall(hwmon_init);
projects / karo-tx-linux.git / blobdiff