drivers/hwmon/smsc47b397.c - fp2-dev/kernel/msm - Gitiles

 /*
  * 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 <khali@linux-fr.org>
  *
  * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
  */

 #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 void superio_enter(void)
 {
 	outb(0x55, REG);
 }

 static inline void superio_exit(void)
 {
 	outb(0xAA, REG);
 }

 #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;
 	const char *name;
 	struct device *hwmon_dev;
 	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 show_temp(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(temp1_input, S_IRUGO, show_temp, NULL, 0);
 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 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 show_fan(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(fan1_input, S_IRUGO, show_fan, NULL, 0);
 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);

 static ssize_t show_name(struct device *dev, struct device_attribute
 			 *devattr, char *buf)
 {
 	struct smsc47b397_data *data = dev_get_drvdata(dev);
 	return sprintf(buf, "%s\n", data->name);
 }
 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);

 static struct attribute *smsc47b397_attributes[] = {
 	&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,

 	&dev_attr_name.attr,
 	NULL
 };

 static const struct attribute_group smsc47b397_group = {
 	.attrs = smsc47b397_attributes,
 };

 static int __devexit smsc47b397_remove(struct platform_device *pdev)
 {
 	struct smsc47b397_data *data = platform_get_drvdata(pdev);
 	struct resource *res;

 	hwmon_device_unregister(data->hwmon_dev);
 	sysfs_remove_group(&pdev->dev.kobj, &smsc47b397_group);
 	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 	release_region(res->start, SMSC_EXTENT);
 	kfree(data);

 	return 0;
 }

 static int smsc47b397_probe(struct platform_device *pdev);

 static struct platform_driver smsc47b397_driver = {
 	.driver = {
 		.owner	= THIS_MODULE,
 		.name	= DRVNAME,
 	},
 	.probe		= smsc47b397_probe,
 	.remove		= __devexit_p(smsc47b397_remove),
 };

 static int __devinit smsc47b397_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct smsc47b397_data *data;
 	struct resource *res;
 	int err = 0;

 	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 	if (!request_region(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 = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL);
 	if (!data) {
 		err = -ENOMEM;
 		goto error_release;
 	}

 	data->addr = res->start;
 	data->name = "smsc47b397";
 	mutex_init(&data->lock);
 	mutex_init(&data->update_lock);
 	platform_set_drvdata(pdev, data);

 	err = sysfs_create_group(&dev->kobj, &smsc47b397_group);
 	if (err)
 		goto error_free;

 	data->hwmon_dev = hwmon_device_register(dev);
 	if (IS_ERR(data->hwmon_dev)) {
 		err = PTR_ERR(data->hwmon_dev);
 		goto error_remove;
 	}

 	return 0;

 error_remove:
 	sysfs_remove_group(&dev->kobj, &smsc47b397_group);
 error_free:
 	kfree(data);
 error_release:
 	release_region(res->start, SMSC_EXTENT);
 	return err;
 }

 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(unsigned short *addr)
 {
 	u8 id, rev;
 	char *name;

 	superio_enter();
 	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 0;
 }

 static int __init smsc47b397_init(void)
 {
 	unsigned short address;
 	int ret;

 	ret = smsc47b397_find(&address);
 	if (ret)
 		return 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);
	/*
	* 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 <khali@linux-fr.org>
	*
	* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
	*/

	#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 void superio_enter(void)
	{
	outb(0x55, REG);
	}

	static inline void superio_exit(void)
	{
	outb(0xAA, REG);
	}

	#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;
	const char *name;
	struct device *hwmon_dev;
	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 show_temp(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(temp1_input, S_IRUGO, show_temp, NULL, 0);
	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
	static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 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 show_fan(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(fan1_input, S_IRUGO, show_fan, NULL, 0);
	static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
	static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
	static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);

	static ssize_t show_name(struct device *dev, struct device_attribute
	devattr, char buf)
	{
	struct smsc47b397_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%s\n", data->name);
	}
	static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);

	static struct attribute *smsc47b397_attributes[] = {
	&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,

	&dev_attr_name.attr,
	NULL
	};

	static const struct attribute_group smsc47b397_group = {
	.attrs = smsc47b397_attributes,
	};

	static int __devexit smsc47b397_remove(struct platform_device *pdev)
	{
	struct smsc47b397_data *data = platform_get_drvdata(pdev);
	struct resource *res;

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&pdev->dev.kobj, &smsc47b397_group);
	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	release_region(res->start, SMSC_EXTENT);
	kfree(data);

	return 0;
	}

	static int smsc47b397_probe(struct platform_device *pdev);

	static struct platform_driver smsc47b397_driver = {
	.driver = {
	.owner = THIS_MODULE,
	.name = DRVNAME,
	},
	.probe = smsc47b397_probe,
	.remove = __devexit_p(smsc47b397_remove),
	};

	static int __devinit smsc47b397_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct smsc47b397_data *data;
	struct resource *res;
	int err = 0;

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (!request_region(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 = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL);
	if (!data) {
	err = -ENOMEM;
	goto error_release;
	}

	data->addr = res->start;
	data->name = "smsc47b397";
	mutex_init(&data->lock);
	mutex_init(&data->update_lock);
	platform_set_drvdata(pdev, data);

	err = sysfs_create_group(&dev->kobj, &smsc47b397_group);
	if (err)
	goto error_free;

	data->hwmon_dev = hwmon_device_register(dev);
	if (IS_ERR(data->hwmon_dev)) {
	err = PTR_ERR(data->hwmon_dev);
	goto error_remove;
	}

	return 0;

	error_remove:
	sysfs_remove_group(&dev->kobj, &smsc47b397_group);
	error_free:
	kfree(data);
	error_release:
	release_region(res->start, SMSC_EXTENT);
	return err;
	}

	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(unsigned short *addr)
	{
	u8 id, rev;
	char *name;

	superio_enter();
	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 0;
	}

	static int __init smsc47b397_init(void)
	{
	unsigned short address;
	int ret;

	ret = smsc47b397_find(&address);
	if (ret)
	return 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);