[linux-block.git] / drivers / hwmon / smsc47b397.c

// 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 */
	bool 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 = true;

		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);
Commit	Line	Data
74ba9207	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4	2	/*
2a52dd66 GR	3	* smsc47b397.c - Part of lm_sensors, Linux kernel modules
	4	* for hardware monitoring
	5	*
	6	* Supports the SMSC LPC47B397-NC Super-I/O chip.
	7	*
	8	* Author/Maintainer: Mark M. Hoffman <mhoffman@lightlink.com>
	9	* Copyright (C) 2004 Utilitek Systems, Inc.
	10	*
	11	* derived in part from smsc47m1.c:
	12	* Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
7c81c60f	13	* Copyright (C) 2004 Jean Delvare <jdelvare@suse.de>
2a52dd66	14	*/
1da177e4	15
bf1a85ef JP	16	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
bf1a85ef JP	17
1da177e4 LT	18	#include <linux/module.h>
	19	#include <linux/slab.h>
	20	#include <linux/ioport.h>
	21	#include <linux/jiffies.h>
292fc1a5	22	#include <linux/platform_device.h>
943b0830	23	#include <linux/hwmon.h>
3659a017	24	#include <linux/hwmon-sysfs.h>
943b0830	25	#include <linux/err.h>
1da177e4	26	#include <linux/init.h>
9a61bf63	27	#include <linux/mutex.h>
b9acb64a	28	#include <linux/acpi.h>
6055fae8	29	#include <linux/io.h>
1da177e4	30
67b671bc JD	31	static unsigned short force_id;
	32	module_param(force_id, ushort, 0);
	33	MODULE_PARM_DESC(force_id, "Override the detected device ID");
	34
292fc1a5 JD	35	static struct platform_device *pdev;
	36
	37	#define DRVNAME "smsc47b397"
1da177e4 LT	38
	39	/* Super-I/0 registers and commands */
	40
	41	#define REG 0x2e /* The register to read/write */
	42	#define VAL 0x2f /* The value to read/write */
	43
	44	static inline void superio_outb(int reg, int val)
	45	{
	46	outb(reg, REG);
	47	outb(val, VAL);
	48	}
	49
	50	static inline int superio_inb(int reg)
	51	{
	52	outb(reg, REG);
	53	return inb(VAL);
	54	}
	55
	56	/* select superio logical device */
	57	static inline void superio_select(int ld)
	58	{
	59	superio_outb(0x07, ld);
	60	}
	61
8c082675	62	static inline int superio_enter(void)
1da177e4	63	{
8c082675 GR	64	if (!request_muxed_region(REG, 2, DRVNAME))
	65	return -EBUSY;
	66
1da177e4	67	outb(0x55, REG);
8c082675	68	return 0;
1da177e4 LT	69	}
	70
	71	static inline void superio_exit(void)
	72	{
	73	outb(0xAA, REG);
8c082675	74	release_region(REG, 2);
1da177e4 LT	75	}
	76
	77	#define SUPERIO_REG_DEVID 0x20
	78	#define SUPERIO_REG_DEVREV 0x21
	79	#define SUPERIO_REG_BASE_MSB 0x60
	80	#define SUPERIO_REG_BASE_LSB 0x61
	81	#define SUPERIO_REG_LD8 0x08
	82
	83	#define SMSC_EXTENT 0x02
	84
	85	/* 0 <= nr <= 3 */
	86	static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
	87	#define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)])
	88
	89	/* 0 <= nr <= 3 */
	90	#define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
	91	#define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))
	92
	93	struct smsc47b397_data {
292fc1a5	94	unsigned short addr;
9a61bf63	95	struct mutex lock;
1da177e4	96
9a61bf63	97	struct mutex update_lock;
1da177e4	98	unsigned long last_updated; /* in jiffies */
952a11ca	99	bool valid;
1da177e4 LT	100
	101	/* register values */
	102	u16 fan[4];
	103	u8 temp[4];
	104	};
	105
371f2e08	106	static int smsc47b397_read_value(struct smsc47b397_data *data, u8 reg)
1da177e4	107	{
1da177e4 LT	108	int res;
1da177e4 LT	109
9a61bf63	110	mutex_lock(&data->lock);
292fc1a5 JD	111	outb(reg, data->addr);
292fc1a5 JD	112	res = inb_p(data->addr + 1);
9a61bf63	113	mutex_unlock(&data->lock);
1da177e4 LT	114	return res;
	115	}
	116
	117	static struct smsc47b397_data smsc47b397_update_device(struct device dev)
	118	{
292fc1a5	119	struct smsc47b397_data *data = dev_get_drvdata(dev);
1da177e4 LT	120	int i;
1da177e4 LT	121
9a61bf63	122	mutex_lock(&data->update_lock);
1da177e4 LT	123
1da177e4 LT	124	if (time_after(jiffies, data->last_updated + HZ) \|\| !data->valid) {
292fc1a5	125	dev_dbg(dev, "starting device update...\n");
1da177e4 LT	126
	127	/* 4 temperature inputs, 4 fan inputs */
	128	for (i = 0; i < 4; i++) {
292fc1a5	129	data->temp[i] = smsc47b397_read_value(data,
1da177e4 LT	130	SMSC47B397_REG_TEMP(i));
	131
	132	/* must read LSB first */
292fc1a5	133	data->fan[i] = smsc47b397_read_value(data,
1da177e4	134	SMSC47B397_REG_FAN_LSB(i));
292fc1a5	135	data->fan[i] \|= smsc47b397_read_value(data,
1da177e4 LT	136	SMSC47B397_REG_FAN_MSB(i)) << 8;
	137	}
	138
	139	data->last_updated = jiffies;
952a11ca	140	data->valid = true;
1da177e4	141
292fc1a5	142	dev_dbg(dev, "... device update complete\n");
1da177e4 LT	143	}
1da177e4 LT	144
9a61bf63	145	mutex_unlock(&data->update_lock);
1da177e4 LT	146
	147	return data;
	148	}
	149
2a52dd66 GR	150	/*
	151	* TEMP: 0.001C/bit (-128C to +127C)
	152	* REG: 1C/bit, two's complement
	153	*/
1da177e4 LT	154	static int temp_from_reg(u8 reg)
	155	{
	156	return (s8)reg * 1000;
	157	}
	158
8721bdec GR	159	static ssize_t temp_show(struct device dev, struct device_attribute devattr,
8721bdec GR	160	char *buf)
1da177e4	161	{
3659a017	162	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
1da177e4	163	struct smsc47b397_data *data = smsc47b397_update_device(dev);
3659a017	164	return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
1da177e4 LT	165	}
1da177e4 LT	166
8721bdec GR	167	static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
	168	static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
	169	static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
	170	static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
1da177e4	171
2a52dd66 GR	172	/*
	173	* FAN: 1 RPM/bit
	174	* REG: count of 90kHz pulses / revolution
	175	*/
1da177e4 LT	176	static int fan_from_reg(u16 reg)
1da177e4 LT	177	{
90205c6c JD	178	if (reg == 0 \|\| reg == 0xffff)
90205c6c JD	179	return 0;
1da177e4 LT	180	return 90000 * 60 / reg;
	181	}
	182
8721bdec GR	183	static ssize_t fan_show(struct device dev, struct device_attribute devattr,
8721bdec GR	184	char *buf)
1da177e4	185	{
3659a017 JD	186	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	187	struct smsc47b397_data *data = smsc47b397_update_device(dev);
	188	return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index]));
1da177e4	189	}
8721bdec GR	190	static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
	191	static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
	192	static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2);
	193	static SENSOR_DEVICE_ATTR_RO(fan4_input, fan, 3);
1da177e4	194
9b993e36	195	static struct attribute *smsc47b397_attrs[] = {
3659a017 JD	196	&sensor_dev_attr_temp1_input.dev_attr.attr,
	197	&sensor_dev_attr_temp2_input.dev_attr.attr,
	198	&sensor_dev_attr_temp3_input.dev_attr.attr,
	199	&sensor_dev_attr_temp4_input.dev_attr.attr,
	200	&sensor_dev_attr_fan1_input.dev_attr.attr,
	201	&sensor_dev_attr_fan2_input.dev_attr.attr,
	202	&sensor_dev_attr_fan3_input.dev_attr.attr,
	203	&sensor_dev_attr_fan4_input.dev_attr.attr,
c1685f61 MH	204
	205	NULL
	206	};
	207
9b993e36	208	ATTRIBUTE_GROUPS(smsc47b397);
1da177e4	209
292fc1a5	210	static int smsc47b397_probe(struct platform_device *pdev);
2d8672c5	211
292fc1a5	212	static struct platform_driver smsc47b397_driver = {
cdaf7934	213	.driver = {
292fc1a5	214	.name = DRVNAME,
cdaf7934	215	},
292fc1a5	216	.probe = smsc47b397_probe,
1da177e4 LT	217	};
1da177e4 LT	218
6c931ae1	219	static int smsc47b397_probe(struct platform_device *pdev)
1da177e4	220	{
292fc1a5	221	struct device *dev = &pdev->dev;
1da177e4	222	struct smsc47b397_data *data;
9b993e36	223	struct device *hwmon_dev;
292fc1a5	224	struct resource *res;
1da177e4	225
292fc1a5	226	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
e43d5fef GR	227	if (!devm_request_region(dev, res->start, SMSC_EXTENT,
e43d5fef GR	228	smsc47b397_driver.driver.name)) {
292fc1a5 JD	229	dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
	230	(unsigned long)res->start,
	231	(unsigned long)res->start + SMSC_EXTENT - 1);
1da177e4 LT	232	return -EBUSY;
	233	}
	234
e43d5fef GR	235	data = devm_kzalloc(dev, sizeof(struct smsc47b397_data), GFP_KERNEL);
	236	if (!data)
	237	return -ENOMEM;
1da177e4	238
292fc1a5	239	data->addr = res->start;
9a61bf63	240	mutex_init(&data->lock);
9a61bf63	241	mutex_init(&data->update_lock);
1da177e4	242
9b993e36 AL	243	hwmon_dev = devm_hwmon_device_register_with_groups(dev, "smsc47b397",
	244	data,
	245	smsc47b397_groups);
	246	return PTR_ERR_OR_ZERO(hwmon_dev);
292fc1a5 JD	247	}
	248
	249	static int __init smsc47b397_device_add(unsigned short address)
	250	{
	251	struct resource res = {
	252	.start = address,
	253	.end = address + SMSC_EXTENT - 1,
	254	.name = DRVNAME,
	255	.flags = IORESOURCE_IO,
	256	};
	257	int err;
	258
b9acb64a JD	259	err = acpi_check_resource_conflict(&res);
	260	if (err)
	261	goto exit;
	262
292fc1a5 JD	263	pdev = platform_device_alloc(DRVNAME, address);
	264	if (!pdev) {
	265	err = -ENOMEM;
bf1a85ef	266	pr_err("Device allocation failed\n");
292fc1a5 JD	267	goto exit;
	268	}
	269
	270	err = platform_device_add_resources(pdev, &res, 1);
	271	if (err) {
bf1a85ef	272	pr_err("Device resource addition failed (%d)\n", err);
292fc1a5 JD	273	goto exit_device_put;
	274	}
	275
	276	err = platform_device_add(pdev);
	277	if (err) {
bf1a85ef	278	pr_err("Device addition failed (%d)\n", err);
292fc1a5 JD	279	goto exit_device_put;
	280	}
	281
	282	return 0;
	283
	284	exit_device_put:
	285	platform_device_put(pdev);
	286	exit:
1da177e4 LT	287	return err;
	288	}
	289
8528e07e	290	static int __init smsc47b397_find(void)
1da177e4 LT	291	{
1da177e4 LT	292	u8 id, rev;
80930776	293	char *name;
8528e07e	294	unsigned short addr;
8c082675 GR	295	int err;
	296
	297	err = superio_enter();
	298	if (err)
	299	return err;
1da177e4	300
67b671bc	301	id = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);
1da177e4	302
371f2e08	303	switch (id) {
80930776 CK	304	case 0x81:
	305	name = "SCH5307-NS";
	306	break;
	307	case 0x6f:
	308	name = "LPC47B397-NC";
	309	break;
	310	case 0x85:
	311	case 0x8c:
	312	name = "SCH5317";
	313	break;
	314	default:
1da177e4 LT	315	superio_exit();
	316	return -ENODEV;
	317	}
	318
	319	rev = superio_inb(SUPERIO_REG_DEVREV);
	320
	321	superio_select(SUPERIO_REG_LD8);
8528e07e	322	addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
1da177e4 LT	323	\| superio_inb(SUPERIO_REG_BASE_LSB);
1da177e4 LT	324
bf1a85ef	325	pr_info("found SMSC %s (base address 0x%04x, revision %u)\n",
8528e07e	326	name, addr, rev);
1da177e4 LT	327
1da177e4 LT	328	superio_exit();
8528e07e	329	return addr;
1da177e4 LT	330	}
	331
	332	static int __init smsc47b397_init(void)
	333	{
292fc1a5	334	unsigned short address;
1da177e4 LT	335	int ret;
1da177e4 LT	336
8528e07e GR	337	ret = smsc47b397_find();
8528e07e GR	338	if (ret < 0)
1da177e4	339	return ret;
8528e07e	340	address = ret;
1da177e4	341
292fc1a5 JD	342	ret = platform_driver_register(&smsc47b397_driver);
	343	if (ret)
	344	goto exit;
	345
	346	/* Sets global pdev as a side effect */
	347	ret = smsc47b397_device_add(address);
	348	if (ret)
	349	goto exit_driver;
	350
	351	return 0;
	352
	353	exit_driver:
	354	platform_driver_unregister(&smsc47b397_driver);
	355	exit:
	356	return ret;
1da177e4 LT	357	}
	358
	359	static void __exit smsc47b397_exit(void)
	360	{
292fc1a5 JD	361	platform_device_unregister(pdev);
292fc1a5 JD	362	platform_driver_unregister(&smsc47b397_driver);
1da177e4 LT	363	}
	364
	365	MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
	366	MODULE_DESCRIPTION("SMSC LPC47B397 driver");
	367	MODULE_LICENSE("GPL");
	368
	369	module_init(smsc47b397_init);
	370	module_exit(smsc47b397_exit);