1 files changed, 148 insertions, 0 deletions
diff --git a/drivers/hwmon/i5500_temp.c b/drivers/hwmon/i5500_temp.c
new file mode 100644
index 000000000..23b9f94fe
--- /dev/null
+++ b/drivers/hwmon/i5500_temp.c
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * i5500_temp - Driver for Intel 5500/5520/X58 chipset thermal sensor
+ *
+ * Copyright (C) 2012, 2014 Jean Delvare <jdelvare@suse.de>
+ */
+
+#include <linux/bitops.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/device.h>
+#include <linux/pci.h>
+#include <linux/hwmon.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
+
+static umode_t i5500_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr,
+				int channel)
+{
+	return 0444;
+}
+
+static int i5500_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
+		      long *val)
+{
+	struct pci_dev *pdev = to_pci_dev(dev->parent);
+	u16 tsthr;
+	s8 tsfsc;
+	u8 ctsts;
+
+	switch (type) {
+	case hwmon_temp:
+		switch (attr) {
+		/* Sensor resolution : 0.5 degree C */
+		case hwmon_temp_input:
+			pci_read_config_word(pdev, REG_TSTHRHI, &tsthr);
+			pci_read_config_byte(pdev, REG_TSFSC, &tsfsc);
+			*val = (tsthr - tsfsc) * 500;
+			return 0;
+		case hwmon_temp_max:
+			pci_read_config_word(pdev, REG_TSTHRHI, &tsthr);
+			*val = tsthr * 500;
+			return 0;
+		case hwmon_temp_max_hyst:
+			pci_read_config_word(pdev, REG_TSTHRLO, &tsthr);
+			*val = tsthr * 500;
+			return 0;
+		case hwmon_temp_crit:
+			pci_read_config_word(pdev, REG_TSTHRCATA, &tsthr);
+			*val = tsthr * 500;
+			return 0;
+		case hwmon_temp_max_alarm:
+			pci_read_config_byte(pdev, REG_CTSTS, &ctsts);
+			*val = !!(ctsts & BIT(1));
+			return 0;
+		case hwmon_temp_crit_alarm:
+			pci_read_config_byte(pdev, REG_CTSTS, &ctsts);
+			*val = !!(ctsts & BIT(0));
+			return 0;
+		default:
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static const struct hwmon_ops i5500_ops = {
+	.is_visible = i5500_is_visible,
+	.read = i5500_read,
+};
+
+static const struct hwmon_channel_info *i5500_info[] = {
+	HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
+	HWMON_CHANNEL_INFO(temp,
+			   HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_CRIT |
+			   HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM
+			   ),
+	NULL
+};
+
+static const struct hwmon_chip_info i5500_chip_info = {
+	.ops = &i5500_ops,
+	.info = i5500_info,
+};
+
+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 device *hwmon_dev;
+	u32 tstimer;
+	s8 tsfsc;
+
+	err = pcim_enable_device(pdev);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to enable device\n");
+		return err;
+	}
+
+	pci_read_config_byte(pdev, REG_TSFSC, &tsfsc);
+	pci_read_config_dword(pdev, REG_TSTIMER, &tstimer);
+	if (tsfsc == 0x7F && tstimer == 0x07D30D40) {
+		dev_notice(&pdev->dev, "Sensor seems to be disabled\n");
+		return -ENODEV;
+	}
+
+	hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, "intel5500", NULL,
+							 &i5500_chip_info, NULL);
+	return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static struct pci_driver i5500_temp_driver = {
+	.name = "i5500_temp",
+	.id_table = i5500_temp_ids,
+	.probe = i5500_temp_probe,
+};
+
+module_pci_driver(i5500_temp_driver);
+
+MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
+MODULE_DESCRIPTION("Intel 5500/5520/X58 chipset thermal sensor driver");
+MODULE_LICENSE("GPL");