3 files changed, 212 insertions, 0 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 6529c09c46f0..a7de26d1ac80 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -574,6 +574,16 @@ config SENSORS_IIO_HWMON
           for those channels specified in the map.  This map can be provided
           either via platform data or the device tree bindings.
 
+config SENSORS_I5500
+        tristate "Intel 5500/5520/X58 temperature sensor"
+        depends on X86 && PCI
+        help
+          If you say yes here you get support for the temperature
+          sensor inside the Intel 5500, 5520 and X58 chipsets.
+
+          This driver can also be built as a module. If so, the module
+          will be called i5500_temp.
+
 config SENSORS_CORETEMP
         tristate "Intel Core/Core2/Atom temperature sensor"
         depends on X86
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 67280643bcf0..6c941472e707 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -68,6 +68,7 @@ obj-$(CONFIG_SENSORS_GPIO_FAN)	+= gpio-fan.o
 obj-$(CONFIG_SENSORS_HIH6130)   += hih6130.o
 obj-$(CONFIG_SENSORS_HTU21)     += htu21.o
 obj-$(CONFIG_SENSORS_ULTRA45)   += ultra45_env.o
+obj-$(CONFIG_SENSORS_I5500)     += i5500_temp.o
 obj-$(CONFIG_SENSORS_I5K_AMB)   += i5k_amb.o
 obj-$(CONFIG_SENSORS_IBMAEM)    += ibmaem.o
 obj-$(CONFIG_SENSORS_IBMPEX)    += ibmpex.o
diff --git a/drivers/hwmon/i5500_temp.c b/drivers/hwmon/i5500_temp.c
new file mode 100644
index 000000000000..cbc822dec942
--- /dev/null
+++ b/drivers/hwmon/i5500_temp.c
@@ -0,0 +1,201 @@
+/*
+ * i5500_temp - Driver for Intel 5500/5520/X58 chipset thermal sensor
+ *
+ * Copyright (C) 2012, 2014 Jean Delvare <jdelvare@suse.de>
+ *
+ * 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.
+ */
+
+#include <linux/module.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>
+
+/* Register definitions from datasheet */
+#define REG_TSTHRCATA   0xE2
+#define REG_TSCTRL      0xE8
+#define REG_TSTHRRPEX   0xEB
+#define REG_TSTHRLO     0xEC
+#define REG_TSTHRHI     0xEE
+#define REG_CTHINT      0xF0
+#define REG_TSFSC       0xF3
+#define REG_CTSTS       0xF4
+#define REG_TSTHRRQPI   0xF5
+#define REG_CTCTRL      0xF7
+#define REG_TSTIMER     0xF8
+
+struct i5500_temp_data {
+        struct device *hwmon_dev;
+        const char *name;
+};
+
+/*
+ * Sysfs stuff
+ */
+
+/* Sensor resolution : 0.5 degree C */
+static ssize_t show_temp(struct device *dev,
+                         struct device_attribute *devattr, char *buf)
+{
+        struct pci_dev *pdev = to_pci_dev(dev);
+        long temp;
+        u16 tsthrhi;
+        s8 tsfsc;
+
+        pci_read_config_word(pdev, REG_TSTHRHI, &tsthrhi);
+        pci_read_config_byte(pdev, REG_TSFSC, &tsfsc);
+        temp = ((long)tsthrhi - tsfsc) * 500;
+
+        return sprintf(buf, "%ld\n", temp);
+}
+
+static ssize_t show_thresh(struct device *dev,
+                           struct device_attribute *devattr, char *buf)
+{
+        struct pci_dev *pdev = to_pci_dev(dev);
+        int reg = to_sensor_dev_attr(devattr)->index;
+        long temp;
+        u16 tsthr;
+
+        pci_read_config_word(pdev, reg, &tsthr);
+        temp = tsthr * 500;
+
+        return sprintf(buf, "%ld\n", temp);
+}
+
+static ssize_t show_alarm(struct device *dev,
+                          struct device_attribute *devattr, char *buf)
+{
+        struct pci_dev *pdev = to_pci_dev(dev);
+        int nr = to_sensor_dev_attr(devattr)->index;
+        u8 ctsts;
+
+        pci_read_config_byte(pdev, REG_CTSTS, &ctsts);
+        return sprintf(buf, "%u\n", (unsigned int)ctsts & (1 << nr));
+}
+
+static ssize_t show_name(struct device *dev, struct device_attribute
+                         *devattr, char *buf)
+{
+        struct i5500_temp_data *data = dev_get_drvdata(dev);
+
+        return sprintf(buf, "%s\n", data->name);
+}
+
+static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
+static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_thresh, NULL, 0xE2);
+static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IRUGO, show_thresh, NULL, 0xEC);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_thresh, NULL, 0xEE);
+static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 1);
+static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
+
+static struct attribute *i5500_temp_attributes[] = {
+        &dev_attr_temp1_input.attr,
+        &sensor_dev_attr_temp1_crit.dev_attr.attr,
+        &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
+        &sensor_dev_attr_temp1_max.dev_attr.attr,
+        &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
+        &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+        &dev_attr_name.attr,
+        NULL
+};
+
+static const struct attribute_group i5500_temp_group = {
+        .attrs = i5500_temp_attributes,
+};
+
+static const struct pci_device_id i5500_temp_ids[] = {
+        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x3438) },
+        { 0 },
+};
+
+MODULE_DEVICE_TABLE(pci, i5500_temp_ids);
+
+static int i5500_temp_probe(struct pci_dev *pdev,
+                            const struct pci_device_id *id)
+{
+        int err;
+        struct i5500_temp_data *data;
+
+        data = kzalloc(sizeof(struct i5500_temp_data), GFP_KERNEL);
+        if (!data) {
+                err = -ENOMEM;
+                goto exit;
+        }
+
+        data->name = "intel5500";
+        dev_set_drvdata(&pdev->dev, data);
+
+        err = pci_enable_device(pdev);
+        if (err) {
+                dev_err(&pdev->dev, "Failed to enable device\n");
+                goto exit_free;
+        }
+
+        /* Register sysfs hooks */
+        err = sysfs_create_group(&pdev->dev.kobj, &i5500_temp_group);
+        if (err)
+                goto exit_free;
+
+        data->hwmon_dev = hwmon_device_register(&pdev->dev);
+        if (IS_ERR(data->hwmon_dev)) {
+                err = PTR_ERR(data->hwmon_dev);
+                goto exit_remove;
+        }
+
+        return 0;
+
+ exit_remove:
+        sysfs_remove_group(&pdev->dev.kobj, &i5500_temp_group);
+ exit_free:
+        kfree(data);
+ exit:
+        return err;
+}
+
+static void i5500_temp_remove(struct pci_dev *pdev)
+{
+        struct i5500_temp_data *data = dev_get_drvdata(&pdev->dev);
+
+        hwmon_device_unregister(data->hwmon_dev);
+        sysfs_remove_group(&pdev->dev.kobj, &i5500_temp_group);
+        kfree(data);
+}
+
+static struct pci_driver i5500_temp_driver = {
+        .name = "i5500_temp",
+        .id_table = i5500_temp_ids,
+        .probe = i5500_temp_probe,
+        .remove = i5500_temp_remove,
+};
+
+static int __init i5500_temp_init(void)
+{
+        return pci_register_driver(&i5500_temp_driver);
+}
+
+static void __exit i5500_temp_exit(void)
+{
+        pci_unregister_driver(&i5500_temp_driver);
+}
+
+MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
+MODULE_DESCRIPTION("Intel 5500/5520/X58 chipset thermal sensor driver");
+MODULE_LICENSE("GPL");
+
+module_init(i5500_temp_init)
+module_exit(i5500_temp_exit)