1 files changed, 204 insertions, 59 deletions

diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index 29ea6753f3b..a26c385a435 100644
--- a/drivers/hwmon/hwmon.c
+++ b/drivers/hwmon/hwmon.c
@@ -1,72 +1,154 @@
 /*
-    hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
-
-    This file defines the sysfs class "hwmon", for use by sensors drivers.
-
-    Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
+ * hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
+ *
+ * This file defines the sysfs class "hwmon", for use by sensors drivers.
+ *
+ * Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ */
 
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; version 2 of the License.
-*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #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>
 #include <linux/gfp.h>
 #include <linux/spinlock.h>
 #include <linux/pci.h>
+#include <linux/string.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_IDR(hwmon_idr);
-static DEFINE_SPINLOCK(idr_lock);
+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, err;
+	struct hwmon_device *hwdev;
+	int err, id;
 
-again:
-	if (unlikely(idr_pre_get(&hwmon_idr, GFP_KERNEL) == 0))
-		return ERR_PTR(-ENOMEM);
+	/* Do not accept invalid characters in hwmon name attribute */
+	if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
+		return ERR_PTR(-EINVAL);
 
-	spin_lock(&idr_lock);
-	err = idr_get_new(&hwmon_idr, NULL, &id);
-	spin_unlock(&idr_lock);
+	id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
+	if (id < 0)
+		return ERR_PTR(id);
 
-	if (unlikely(err == -EAGAIN))
-		goto again;
-	else if (unlikely(err))
-		return ERR_PTR(err);
+	hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
+	if (hwdev == NULL) {
+		err = -ENOMEM;
+		goto ida_remove;
+	}
 
-	id = id & MAX_ID_MASK;
-	hwdev = device_create(hwmon_class, dev, MKDEV(0, 0), NULL,
-			      HWMON_ID_FORMAT, 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;
 
-	if (IS_ERR(hwdev)) {
-		spin_lock(&idr_lock);
-		idr_remove(&hwmon_idr, id);
-		spin_unlock(&idr_lock);
-	}
+	return &hwdev->dev;
 
-	return hwdev;
+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);
 
 /**
  * hwmon_device_unregister - removes the previously registered class device
@@ -79,13 +161,75 @@ void hwmon_device_unregister(struct device *dev)
 
 	if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
 		device_unregister(dev);
-		spin_lock(&idr_lock);
-		idr_remove(&hwmon_idr, id);
-		spin_unlock(&idr_lock);
+		ida_simple_remove(&hwmon_ida, id);
 	} else
 		dev_dbg(dev->parent,
 			"hwmon_device_unregister() failed: bad class ID!\n");
 }
+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)
 {
@@ -96,46 +240,47 @@ static void __init hwmon_pci_quirks(void)
 
 	/* Open access to 0x295-0x296 on MSI MS-7031 */
 	sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
-	if (sb &&
-	    (sb->subsystem_vendor == 0x1462 &&	/* MSI */
-	     sb->subsystem_device == 0x0031)) {	/* MS-7031 */
-
-		pci_read_config_byte(sb, 0x48, &enable);
-		pci_read_config_word(sb, 0x64, &base);
-
-		if (base == 0 && !(enable & BIT(2))) {
-			dev_info(&sb->dev,
-				 "Opening wide generic port at 0x295\n");
-			pci_write_config_word(sb, 0x64, 0x295);
-			pci_write_config_byte(sb, 0x48, enable | BIT(2));
+	if (sb) {
+		if (sb->subsystem_vendor == 0x1462 &&	/* MSI */
+		    sb->subsystem_device == 0x0031) {	/* MS-7031 */
+			pci_read_config_byte(sb, 0x48, &enable);
+			pci_read_config_word(sb, 0x64, &base);
+
+			if (base == 0 && !(enable & BIT(2))) {
+				dev_info(&sb->dev,
+					 "Opening wide generic port at 0x295\n");
+				pci_write_config_word(sb, 0x64, 0x295);
+				pci_write_config_byte(sb, 0x48,
+						      enable | BIT(2));
+			}
 		}
+		pci_dev_put(sb);
 	}
 #endif
 }
 
 static int __init hwmon_init(void)
 {
+	int err;
+
 	hwmon_pci_quirks();
 
-	hwmon_class = class_create(THIS_MODULE, "hwmon");
-	if (IS_ERR(hwmon_class)) {
-		printk(KERN_ERR "hwmon.c: 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);
 module_exit(hwmon_exit);
 
-EXPORT_SYMBOL_GPL(hwmon_device_register);
-EXPORT_SYMBOL_GPL(hwmon_device_unregister);
-
 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
 MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
 MODULE_LICENSE("GPL");