1 files changed, 343 insertions, 0 deletions

diff --git a/drivers/hwmon/via-cputemp.c b/drivers/hwmon/via-cputemp.c
new file mode 100644
index 000000000..0e81f287d
--- /dev/null
+++ b/drivers/hwmon/via-cputemp.c
@@ -0,0 +1,343 @@
+/*
+ * via-cputemp.c - Driver for VIA CPU core temperature monitoring
+ * Copyright (C) 2009 VIA Technologies, Inc.
+ *
+ * based on existing coretemp.c, which is
+ *
+ * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
+ *
+ * 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 distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-vid.h>
+#include <linux/sysfs.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/list.h>
+#include <linux/platform_device.h>
+#include <linux/cpu.h>
+#include <asm/msr.h>
+#include <asm/processor.h>
+#include <asm/cpu_device_id.h>
+
+#define DRVNAME	"via_cputemp"
+
+enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };
+
+/*
+ * Functions declaration
+ */
+
+struct via_cputemp_data {
+	struct device *hwmon_dev;
+	const char *name;
+	u8 vrm;
+	u32 id;
+	u32 msr_temp;
+	u32 msr_vid;
+};
+
+/*
+ * Sysfs stuff
+ */
+
+static ssize_t show_name(struct device *dev, struct device_attribute
+			  *devattr, char *buf)
+{
+	int ret;
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct via_cputemp_data *data = dev_get_drvdata(dev);
+
+	if (attr->index == SHOW_NAME)
+		ret = sprintf(buf, "%s\n", data->name);
+	else	/* show label */
+		ret = sprintf(buf, "Core %d\n", data->id);
+	return ret;
+}
+
+static ssize_t show_temp(struct device *dev,
+			 struct device_attribute *devattr, char *buf)
+{
+	struct via_cputemp_data *data = dev_get_drvdata(dev);
+	u32 eax, edx;
+	int err;
+
+	err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
+	if (err)
+		return -EAGAIN;
+
+	return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000);
+}
+
+static ssize_t cpu0_vid_show(struct device *dev,
+			     struct device_attribute *devattr, char *buf)
+{
+	struct via_cputemp_data *data = dev_get_drvdata(dev);
+	u32 eax, edx;
+	int err;
+
+	err = rdmsr_safe_on_cpu(data->id, data->msr_vid, &eax, &edx);
+	if (err)
+		return -EAGAIN;
+
+	return sprintf(buf, "%d\n", vid_from_reg(~edx & 0x7f, data->vrm));
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
+			  SHOW_TEMP);
+static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
+static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
+
+static struct attribute *via_cputemp_attributes[] = {
+	&sensor_dev_attr_name.dev_attr.attr,
+	&sensor_dev_attr_temp1_label.dev_attr.attr,
+	&sensor_dev_attr_temp1_input.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group via_cputemp_group = {
+	.attrs = via_cputemp_attributes,
+};
+
+/* Optional attributes */
+static DEVICE_ATTR_RO(cpu0_vid);
+
+static int via_cputemp_probe(struct platform_device *pdev)
+{
+	struct via_cputemp_data *data;
+	struct cpuinfo_x86 *c = &cpu_data(pdev->id);
+	int err;
+	u32 eax, edx;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(struct via_cputemp_data),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->id = pdev->id;
+	data->name = "via_cputemp";
+
+	if (c->x86 == 7) {
+		data->msr_temp = 0x1423;
+	} else {
+		switch (c->x86_model) {
+		case 0xA:
+			/* C7 A */
+		case 0xD:
+			/* C7 D */
+			data->msr_temp = 0x1169;
+			data->msr_vid = 0x198;
+			break;
+		case 0xF:
+			/* Nano */
+			data->msr_temp = 0x1423;
+			break;
+		default:
+			return -ENODEV;
+		}
+	}
+
+	/* test if we can access the TEMPERATURE MSR */
+	err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
+	if (err) {
+		dev_err(&pdev->dev,
+			"Unable to access TEMPERATURE MSR, giving up\n");
+		return err;
+	}
+
+	platform_set_drvdata(pdev, data);
+
+	err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group);
+	if (err)
+		return err;
+
+	if (data->msr_vid)
+		data->vrm = vid_which_vrm();
+
+	if (data->vrm) {
+		err = device_create_file(&pdev->dev, &dev_attr_cpu0_vid);
+		if (err)
+			goto exit_remove;
+	}
+
+	data->hwmon_dev = hwmon_device_register(&pdev->dev);
+	if (IS_ERR(data->hwmon_dev)) {
+		err = PTR_ERR(data->hwmon_dev);
+		dev_err(&pdev->dev, "Class registration failed (%d)\n",
+			err);
+		goto exit_remove;
+	}
+
+	return 0;
+
+exit_remove:
+	if (data->vrm)
+		device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
+	sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
+	return err;
+}
+
+static int via_cputemp_remove(struct platform_device *pdev)
+{
+	struct via_cputemp_data *data = platform_get_drvdata(pdev);
+
+	hwmon_device_unregister(data->hwmon_dev);
+	if (data->vrm)
+		device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
+	sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
+	return 0;
+}
+
+static struct platform_driver via_cputemp_driver = {
+	.driver = {
+		.name = DRVNAME,
+	},
+	.probe = via_cputemp_probe,
+	.remove = via_cputemp_remove,
+};
+
+struct pdev_entry {
+	struct list_head list;
+	struct platform_device *pdev;
+	unsigned int cpu;
+};
+
+static LIST_HEAD(pdev_list);
+static DEFINE_MUTEX(pdev_list_mutex);
+
+static int via_cputemp_online(unsigned int cpu)
+{
+	int err;
+	struct platform_device *pdev;
+	struct pdev_entry *pdev_entry;
+
+	pdev = platform_device_alloc(DRVNAME, cpu);
+	if (!pdev) {
+		err = -ENOMEM;
+		pr_err("Device allocation failed\n");
+		goto exit;
+	}
+
+	pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
+	if (!pdev_entry) {
+		err = -ENOMEM;
+		goto exit_device_put;
+	}
+
+	err = platform_device_add(pdev);
+	if (err) {
+		pr_err("Device addition failed (%d)\n", err);
+		goto exit_device_free;
+	}
+
+	pdev_entry->pdev = pdev;
+	pdev_entry->cpu = cpu;
+	mutex_lock(&pdev_list_mutex);
+	list_add_tail(&pdev_entry->list, &pdev_list);
+	mutex_unlock(&pdev_list_mutex);
+
+	return 0;
+
+exit_device_free:
+	kfree(pdev_entry);
+exit_device_put:
+	platform_device_put(pdev);
+exit:
+	return err;
+}
+
+static int via_cputemp_down_prep(unsigned int cpu)
+{
+	struct pdev_entry *p;
+
+	mutex_lock(&pdev_list_mutex);
+	list_for_each_entry(p, &pdev_list, list) {
+		if (p->cpu == cpu) {
+			platform_device_unregister(p->pdev);
+			list_del(&p->list);
+			mutex_unlock(&pdev_list_mutex);
+			kfree(p);
+			return 0;
+		}
+	}
+	mutex_unlock(&pdev_list_mutex);
+	return 0;
+}
+
+static const struct x86_cpu_id __initconst cputemp_ids[] = {
+	{ X86_VENDOR_CENTAUR, 6, 0xa, }, /* C7 A */
+	{ X86_VENDOR_CENTAUR, 6, 0xd, }, /* C7 D */
+	{ X86_VENDOR_CENTAUR, 6, 0xf, }, /* Nano */
+	{ X86_VENDOR_CENTAUR, 7, X86_MODEL_ANY, },
+	{}
+};
+MODULE_DEVICE_TABLE(x86cpu, cputemp_ids);
+
+static enum cpuhp_state via_temp_online;
+
+static int __init via_cputemp_init(void)
+{
+	int err;
+
+	if (!x86_match_cpu(cputemp_ids))
+		return -ENODEV;
+
+	err = platform_driver_register(&via_cputemp_driver);
+	if (err)
+		goto exit;
+
+	err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/via:online",
+				via_cputemp_online, via_cputemp_down_prep);
+	if (err < 0)
+		goto exit_driver_unreg;
+	via_temp_online = err;
+
+#ifndef CONFIG_HOTPLUG_CPU
+	if (list_empty(&pdev_list)) {
+		err = -ENODEV;
+		goto exit_hp_unreg;
+	}
+#endif
+	return 0;
+
+#ifndef CONFIG_HOTPLUG_CPU
+exit_hp_unreg:
+	cpuhp_remove_state_nocalls(via_temp_online);
+#endif
+exit_driver_unreg:
+	platform_driver_unregister(&via_cputemp_driver);
+exit:
+	return err;
+}
+
+static void __exit via_cputemp_exit(void)
+{
+	cpuhp_remove_state(via_temp_online);
+	platform_driver_unregister(&via_cputemp_driver);
+}
+
+MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
+MODULE_DESCRIPTION("VIA CPU temperature monitor");
+MODULE_LICENSE("GPL");
+
+module_init(via_cputemp_init)
+module_exit(via_cputemp_exit)