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path: root/drivers/hwmon/k8temp.c
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Diffstat (limited to 'drivers/hwmon/k8temp.c')
-rw-r--r--drivers/hwmon/k8temp.c292
1 files changed, 292 insertions, 0 deletions
diff --git a/drivers/hwmon/k8temp.c b/drivers/hwmon/k8temp.c
new file mode 100644
index 000000000000..50162ffa8832
--- /dev/null
+++ b/drivers/hwmon/k8temp.c
@@ -0,0 +1,292 @@
+/*
+ * k8temp.c - Linux kernel module for hardware monitoring
+ *
+ * Copyright (C) 2006 Rudolf Marek <r.marek@sh.cvut.cz>
+ *
+ * Inspired from the w83785 and amd756 drivers.
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/pci.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+
+#define TEMP_FROM_REG(val) (((((val) >> 16) & 0xff) - 49) * 1000)
+#define REG_TEMP 0xe4
+#define SEL_PLACE 0x40
+#define SEL_CORE 0x04
+
+struct k8temp_data {
+ struct class_device *class_dev;
+ struct mutex update_lock;
+ const char *name;
+ char valid; /* zero until following fields are valid */
+ unsigned long last_updated; /* in jiffies */
+
+ /* registers values */
+ u8 sensorsp; /* sensor presence bits - SEL_CORE & SEL_PLACE */
+ u32 temp[2][2]; /* core, place */
+};
+
+static struct k8temp_data *k8temp_update_device(struct device *dev)
+{
+ struct k8temp_data *data = dev_get_drvdata(dev);
+ struct pci_dev *pdev = to_pci_dev(dev);
+ u8 tmp;
+
+ mutex_lock(&data->update_lock);
+
+ if (!data->valid
+ || time_after(jiffies, data->last_updated + HZ)) {
+ pci_read_config_byte(pdev, REG_TEMP, &tmp);
+ tmp &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */
+ pci_write_config_byte(pdev, REG_TEMP, tmp);
+ pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][0]);
+
+ if (data->sensorsp & SEL_PLACE) {
+ tmp |= SEL_PLACE; /* Select sensor 1, core0 */
+ pci_write_config_byte(pdev, REG_TEMP, tmp);
+ pci_read_config_dword(pdev, REG_TEMP,
+ &data->temp[0][1]);
+ }
+
+ if (data->sensorsp & SEL_CORE) {
+ tmp &= ~SEL_PLACE; /* Select sensor 0, core1 */
+ tmp |= SEL_CORE;
+ pci_write_config_byte(pdev, REG_TEMP, tmp);
+ pci_read_config_dword(pdev, REG_TEMP,
+ &data->temp[1][0]);
+
+ if (data->sensorsp & SEL_PLACE) {
+ tmp |= SEL_PLACE; /* Select sensor 1, core1 */
+ pci_write_config_byte(pdev, REG_TEMP, tmp);
+ pci_read_config_dword(pdev, REG_TEMP,
+ &data->temp[1][1]);
+ }
+ }
+
+ data->last_updated = jiffies;
+ data->valid = 1;
+ }
+
+ mutex_unlock(&data->update_lock);
+ return data;
+}
+
+/*
+ * Sysfs stuff
+ */
+
+static ssize_t show_name(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct k8temp_data *data = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%s\n", data->name);
+}
+
+
+static ssize_t show_temp(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ struct sensor_device_attribute_2 *attr =
+ to_sensor_dev_attr_2(devattr);
+ int core = attr->nr;
+ int place = attr->index;
+ struct k8temp_data *data = k8temp_update_device(dev);
+
+ return sprintf(buf, "%d\n",
+ TEMP_FROM_REG(data->temp[core][place]));
+}
+
+/* core, place */
+
+static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
+static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
+static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
+static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
+static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
+
+static struct pci_device_id k8temp_ids[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
+ { 0 },
+};
+
+static int __devinit k8temp_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ int err;
+ u8 scfg;
+ u32 temp;
+ struct k8temp_data *data;
+ u32 cpuid = cpuid_eax(1);
+
+ /* this feature should be available since SH-C0 core */
+ if ((cpuid == 0xf40) || (cpuid == 0xf50) || (cpuid == 0xf51)) {
+ err = -ENODEV;
+ goto exit;
+ }
+
+ if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) {
+ err = -ENOMEM;
+ goto exit;
+ }
+
+ pci_read_config_byte(pdev, REG_TEMP, &scfg);
+ scfg &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */
+ pci_write_config_byte(pdev, REG_TEMP, scfg);
+ pci_read_config_byte(pdev, REG_TEMP, &scfg);
+
+ if (scfg & (SEL_PLACE | SEL_CORE)) {
+ dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
+ err = -ENODEV;
+ goto exit_free;
+ }
+
+ scfg |= (SEL_PLACE | SEL_CORE);
+ pci_write_config_byte(pdev, REG_TEMP, scfg);
+
+ /* now we know if we can change core and/or sensor */
+ pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
+
+ if (data->sensorsp & SEL_PLACE) {
+ scfg &= ~SEL_CORE; /* Select sensor 1, core0 */
+ pci_write_config_byte(pdev, REG_TEMP, scfg);
+ pci_read_config_dword(pdev, REG_TEMP, &temp);
+ scfg |= SEL_CORE; /* prepare for next selection */
+ if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is not likely */
+ data->sensorsp &= ~SEL_PLACE;
+ }
+
+ if (data->sensorsp & SEL_CORE) {
+ scfg &= ~SEL_PLACE; /* Select sensor 0, core1 */
+ pci_write_config_byte(pdev, REG_TEMP, scfg);
+ pci_read_config_dword(pdev, REG_TEMP, &temp);
+ if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is not likely */
+ data->sensorsp &= ~SEL_CORE;
+ }
+
+ data->name = "k8temp";
+ mutex_init(&data->update_lock);
+ dev_set_drvdata(&pdev->dev, data);
+
+ /* Register sysfs hooks */
+ err = device_create_file(&pdev->dev,
+ &sensor_dev_attr_temp1_input.dev_attr);
+ if (err)
+ goto exit_remove;
+
+ /* sensor can be changed and reports something */
+ if (data->sensorsp & SEL_PLACE) {
+ err = device_create_file(&pdev->dev,
+ &sensor_dev_attr_temp2_input.dev_attr);
+ if (err)
+ goto exit_remove;
+ }
+
+ /* core can be changed and reports something */
+ if (data->sensorsp & SEL_CORE) {
+ err = device_create_file(&pdev->dev,
+ &sensor_dev_attr_temp3_input.dev_attr);
+ if (err)
+ goto exit_remove;
+ if (data->sensorsp & SEL_PLACE)
+ err = device_create_file(&pdev->dev,
+ &sensor_dev_attr_temp4_input.
+ dev_attr);
+ if (err)
+ goto exit_remove;
+ }
+
+ err = device_create_file(&pdev->dev, &dev_attr_name);
+ if (err)
+ goto exit_remove;
+
+ data->class_dev = hwmon_device_register(&pdev->dev);
+
+ if (IS_ERR(data->class_dev)) {
+ err = PTR_ERR(data->class_dev);
+ goto exit_remove;
+ }
+
+ return 0;
+
+exit_remove:
+ device_remove_file(&pdev->dev,
+ &sensor_dev_attr_temp1_input.dev_attr);
+ device_remove_file(&pdev->dev,
+ &sensor_dev_attr_temp2_input.dev_attr);
+ device_remove_file(&pdev->dev,
+ &sensor_dev_attr_temp3_input.dev_attr);
+ device_remove_file(&pdev->dev,
+ &sensor_dev_attr_temp4_input.dev_attr);
+ device_remove_file(&pdev->dev, &dev_attr_name);
+exit_free:
+ dev_set_drvdata(&pdev->dev, NULL);
+ kfree(data);
+exit:
+ return err;
+}
+
+static void __devexit k8temp_remove(struct pci_dev *pdev)
+{
+ struct k8temp_data *data = dev_get_drvdata(&pdev->dev);
+
+ hwmon_device_unregister(data->class_dev);
+ device_remove_file(&pdev->dev,
+ &sensor_dev_attr_temp1_input.dev_attr);
+ device_remove_file(&pdev->dev,
+ &sensor_dev_attr_temp2_input.dev_attr);
+ device_remove_file(&pdev->dev,
+ &sensor_dev_attr_temp3_input.dev_attr);
+ device_remove_file(&pdev->dev,
+ &sensor_dev_attr_temp4_input.dev_attr);
+ device_remove_file(&pdev->dev, &dev_attr_name);
+ dev_set_drvdata(&pdev->dev, NULL);
+ kfree(data);
+}
+
+static struct pci_driver k8temp_driver = {
+ .name = "k8temp",
+ .id_table = k8temp_ids,
+ .probe = k8temp_probe,
+ .remove = __devexit_p(k8temp_remove),
+};
+
+static int __init k8temp_init(void)
+{
+ return pci_register_driver(&k8temp_driver);
+}
+
+static void __exit k8temp_exit(void)
+{
+ pci_unregister_driver(&k8temp_driver);
+}
+
+MODULE_AUTHOR("Rudolf Marek <r.marek@sh.cvut.cz>");
+MODULE_DESCRIPTION("AMD K8 core temperature monitor");
+MODULE_LICENSE("GPL");
+
+module_init(k8temp_init)
+module_exit(k8temp_exit)
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