From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 drivers/hwmon/hwmon.c | 129 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 drivers/hwmon/hwmon.c

(limited to 'drivers/hwmon/hwmon.c')

diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
new file mode 100644
index 00000000..646314f7
--- /dev/null
+++ b/drivers/hwmon/hwmon.c
@@ -0,0 +1,129 @@
+/*
+ * 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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/err.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>
+
+#define HWMON_ID_PREFIX "hwmon"
+#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
+
+static struct class *hwmon_class;
+
+static DEFINE_IDA(hwmon_ida);
+
+/**
+ * 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)
+{
+	struct device *hwdev;
+	int 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);
+
+	if (IS_ERR(hwdev))
+		ida_simple_remove(&hwmon_ida, id);
+
+	return hwdev;
+}
+EXPORT_SYMBOL_GPL(hwmon_device_register);
+
+/**
+ * hwmon_device_unregister - removes the previously registered class device
+ *
+ * @dev: the class device to destroy
+ */
+void hwmon_device_unregister(struct device *dev)
+{
+	int id;
+
+	if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
+		device_unregister(dev);
+		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 __init hwmon_pci_quirks(void)
+{
+#if defined CONFIG_X86 && defined CONFIG_PCI
+	struct pci_dev *sb;
+	u16 base;
+	u8 enable;
+
+	/* Open access to 0x295-0x296 on MSI MS-7031 */
+	sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
+	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)
+{
+	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);
+	}
+	return 0;
+}
+
+static void __exit hwmon_exit(void)
+{
+	class_destroy(hwmon_class);
+}
+
+subsys_initcall(hwmon_init);
+module_exit(hwmon_exit);
+
+MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
+MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
+MODULE_LICENSE("GPL");
+
-- 
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