1 files changed, 370 insertions, 0 deletions
diff --git a/drivers/hwmon/smsc47b397.c b/drivers/hwmon/smsc47b397.c
new file mode 100644
index 000000000..f928b8d4f
--- /dev/null
+++ b/drivers/hwmon/smsc47b397.c
@@ -0,0 +1,370 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * smsc47b397.c - Part of lm_sensors, Linux kernel modules
+ * for hardware monitoring
+ *
+ * Supports the SMSC LPC47B397-NC Super-I/O chip.
+ *
+ * Author/Maintainer: Mark M. Hoffman <mhoffman@lightlink.com>
+ * Copyright (C) 2004 Utilitek Systems, Inc.
+ *
+ * derived in part from smsc47m1.c:
+ * Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
+ * Copyright (C) 2004 Jean Delvare <jdelvare@suse.de>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/jiffies.h>
+#include <linux/platform_device.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/acpi.h>
+#include <linux/io.h>
+
+static unsigned short force_id;
+module_param(force_id, ushort, 0);
+MODULE_PARM_DESC(force_id, "Override the detected device ID");
+
+static struct platform_device *pdev;
+
+#define DRVNAME "smsc47b397"
+
+/* Super-I/0 registers and commands */
+
+#define	REG	0x2e	/* The register to read/write */
+#define	VAL	0x2f	/* The value to read/write */
+
+static inline void superio_outb(int reg, int val)
+{
+	outb(reg, REG);
+	outb(val, VAL);
+}
+
+static inline int superio_inb(int reg)
+{
+	outb(reg, REG);
+	return inb(VAL);
+}
+
+/* select superio logical device */
+static inline void superio_select(int ld)
+{
+	superio_outb(0x07, ld);
+}
+
+static inline int superio_enter(void)
+{
+	if (!request_muxed_region(REG, 2, DRVNAME))
+		return -EBUSY;
+
+	outb(0x55, REG);
+	return 0;
+}
+
+static inline void superio_exit(void)
+{
+	outb(0xAA, REG);
+	release_region(REG, 2);
+}
+
+#define SUPERIO_REG_DEVID	0x20
+#define SUPERIO_REG_DEVREV	0x21
+#define SUPERIO_REG_BASE_MSB	0x60
+#define SUPERIO_REG_BASE_LSB	0x61
+#define SUPERIO_REG_LD8		0x08
+
+#define SMSC_EXTENT		0x02
+
+/* 0 <= nr <= 3 */
+static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
+#define SMSC47B397_REG_TEMP(nr)	(smsc47b397_reg_temp[(nr)])
+
+/* 0 <= nr <= 3 */
+#define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
+#define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))
+
+struct smsc47b397_data {
+	unsigned short addr;
+	struct mutex lock;
+
+	struct mutex update_lock;
+	unsigned long last_updated; /* in jiffies */
+	int valid;
+
+	/* register values */
+	u16 fan[4];
+	u8 temp[4];
+};
+
+static int smsc47b397_read_value(struct smsc47b397_data *data, u8 reg)
+{
+	int res;
+
+	mutex_lock(&data->lock);
+	outb(reg, data->addr);
+	res = inb_p(data->addr + 1);
+	mutex_unlock(&data->lock);
+	return res;
+}
+
+static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
+{
+	struct smsc47b397_data *data = dev_get_drvdata(dev);
+	int i;
+
+	mutex_lock(&data->update_lock);
+
+	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
+		dev_dbg(dev, "starting device update...\n");
+
+		/* 4 temperature inputs, 4 fan inputs */
+		for (i = 0; i < 4; i++) {
+			data->temp[i] = smsc47b397_read_value(data,
+					SMSC47B397_REG_TEMP(i));
+
+			/* must read LSB first */
+			data->fan[i]  = smsc47b397_read_value(data,
+					SMSC47B397_REG_FAN_LSB(i));
+			data->fan[i] |= smsc47b397_read_value(data,
+					SMSC47B397_REG_FAN_MSB(i)) << 8;
+		}
+
+		data->last_updated = jiffies;
+		data->valid = 1;
+
+		dev_dbg(dev, "... device update complete\n");
+	}
+
+	mutex_unlock(&data->update_lock);
+
+	return data;
+}
+
+/*
+ * TEMP: 0.001C/bit (-128C to +127C)
+ * REG: 1C/bit, two's complement
+ */
+static int temp_from_reg(u8 reg)
+{
+	return (s8)reg * 1000;
+}
+
+static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
+			 char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct smsc47b397_data *data = smsc47b397_update_device(dev);
+	return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
+}
+
+static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
+static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
+static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
+static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
+
+/*
+ * FAN: 1 RPM/bit
+ * REG: count of 90kHz pulses / revolution
+ */
+static int fan_from_reg(u16 reg)
+{
+	if (reg == 0 || reg == 0xffff)
+		return 0;
+	return 90000 * 60 / reg;
+}
+
+static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
+			char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct smsc47b397_data *data = smsc47b397_update_device(dev);
+	return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index]));
+}
+static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
+static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
+static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2);
+static SENSOR_DEVICE_ATTR_RO(fan4_input, fan, 3);
+
+static struct attribute *smsc47b397_attrs[] = {
+	&sensor_dev_attr_temp1_input.dev_attr.attr,
+	&sensor_dev_attr_temp2_input.dev_attr.attr,
+	&sensor_dev_attr_temp3_input.dev_attr.attr,
+	&sensor_dev_attr_temp4_input.dev_attr.attr,
+	&sensor_dev_attr_fan1_input.dev_attr.attr,
+	&sensor_dev_attr_fan2_input.dev_attr.attr,
+	&sensor_dev_attr_fan3_input.dev_attr.attr,
+	&sensor_dev_attr_fan4_input.dev_attr.attr,
+
+	NULL
+};
+
+ATTRIBUTE_GROUPS(smsc47b397);
+
+static int smsc47b397_probe(struct platform_device *pdev);
+
+static struct platform_driver smsc47b397_driver = {
+	.driver = {
+		.name	= DRVNAME,
+	},
+	.probe		= smsc47b397_probe,
+};
+
+static int smsc47b397_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct smsc47b397_data *data;
+	struct device *hwmon_dev;
+	struct resource *res;
+
+	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (!devm_request_region(dev, res->start, SMSC_EXTENT,
+				 smsc47b397_driver.driver.name)) {
+		dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
+			(unsigned long)res->start,
+			(unsigned long)res->start + SMSC_EXTENT - 1);
+		return -EBUSY;
+	}
+
+	data = devm_kzalloc(dev, sizeof(struct smsc47b397_data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->addr = res->start;
+	mutex_init(&data->lock);
+	mutex_init(&data->update_lock);
+
+	hwmon_dev = devm_hwmon_device_register_with_groups(dev, "smsc47b397",
+							   data,
+							   smsc47b397_groups);
+	return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static int __init smsc47b397_device_add(unsigned short address)
+{
+	struct resource res = {
+		.start	= address,
+		.end	= address + SMSC_EXTENT - 1,
+		.name	= DRVNAME,
+		.flags	= IORESOURCE_IO,
+	};
+	int err;
+
+	err = acpi_check_resource_conflict(&res);
+	if (err)
+		goto exit;
+
+	pdev = platform_device_alloc(DRVNAME, address);
+	if (!pdev) {
+		err = -ENOMEM;
+		pr_err("Device allocation failed\n");
+		goto exit;
+	}
+
+	err = platform_device_add_resources(pdev, &res, 1);
+	if (err) {
+		pr_err("Device resource addition failed (%d)\n", err);
+		goto exit_device_put;
+	}
+
+	err = platform_device_add(pdev);
+	if (err) {
+		pr_err("Device addition failed (%d)\n", err);
+		goto exit_device_put;
+	}
+
+	return 0;
+
+exit_device_put:
+	platform_device_put(pdev);
+exit:
+	return err;
+}
+
+static int __init smsc47b397_find(void)
+{
+	u8 id, rev;
+	char *name;
+	unsigned short addr;
+	int err;
+
+	err = superio_enter();
+	if (err)
+		return err;
+
+	id = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);
+
+	switch (id) {
+	case 0x81:
+		name = "SCH5307-NS";
+		break;
+	case 0x6f:
+		name = "LPC47B397-NC";
+		break;
+	case 0x85:
+	case 0x8c:
+		name = "SCH5317";
+		break;
+	default:
+		superio_exit();
+		return -ENODEV;
+	}
+
+	rev = superio_inb(SUPERIO_REG_DEVREV);
+
+	superio_select(SUPERIO_REG_LD8);
+	addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
+		 |  superio_inb(SUPERIO_REG_BASE_LSB);
+
+	pr_info("found SMSC %s (base address 0x%04x, revision %u)\n",
+		name, addr, rev);
+
+	superio_exit();
+	return addr;
+}
+
+static int __init smsc47b397_init(void)
+{
+	unsigned short address;
+	int ret;
+
+	ret = smsc47b397_find();
+	if (ret < 0)
+		return ret;
+	address = ret;
+
+	ret = platform_driver_register(&smsc47b397_driver);
+	if (ret)
+		goto exit;
+
+	/* Sets global pdev as a side effect */
+	ret = smsc47b397_device_add(address);
+	if (ret)
+		goto exit_driver;
+
+	return 0;
+
+exit_driver:
+	platform_driver_unregister(&smsc47b397_driver);
+exit:
+	return ret;
+}
+
+static void __exit smsc47b397_exit(void)
+{
+	platform_device_unregister(pdev);
+	platform_driver_unregister(&smsc47b397_driver);
+}
+
+MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
+MODULE_DESCRIPTION("SMSC LPC47B397 driver");
+MODULE_LICENSE("GPL");
+
+module_init(smsc47b397_init);
+module_exit(smsc47b397_exit);