[deliverable/linux.git] / drivers / hwmon / smsc47b397.c

/*
    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.
*/

#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/err.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <asm/io.h>

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 class_device *class_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;
}

/* 0 <= nr <= 3 */
static ssize_t show_temp(struct device *dev, char *buf, int nr)
{
	struct smsc47b397_data *data = smsc47b397_update_device(dev);
	return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr]));
}

#define sysfs_temp(num) \
static ssize_t show_temp##num(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
	return show_temp(dev, buf, num-1); \
} \
static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL)

sysfs_temp(1);
sysfs_temp(2);
sysfs_temp(3);
sysfs_temp(4);

/* FAN: 1 RPM/bit
   REG: count of 90kHz pulses / revolution */
static int fan_from_reg(u16 reg)
{
	return 90000 * 60 / reg;
}

/* 0 <= nr <= 3 */
static ssize_t show_fan(struct device *dev, char *buf, int nr)
{
        struct smsc47b397_data *data = smsc47b397_update_device(dev);
        return sprintf(buf, "%d\n", fan_from_reg(data->fan[nr]));
}

#define sysfs_fan(num) \
static ssize_t show_fan##num(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
	return show_fan(dev, buf, num-1); \
} \
static DEVICE_ATTR(fan##num##_input, S_IRUGO, show_fan##num, NULL)

sysfs_fan(1);
sysfs_fan(2);
sysfs_fan(3);
sysfs_fan(4);

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[] = {
	&dev_attr_temp1_input.attr,
	&dev_attr_temp2_input.attr,
	&dev_attr_temp3_input.attr,
	&dev_attr_temp4_input.attr,
	&dev_attr_fan1_input.attr,
	&dev_attr_fan2_input.attr,
	&dev_attr_fan3_input.attr,
	&dev_attr_fan4_input.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->class_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;
	}

	if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) {
		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);

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

	data->class_dev = hwmon_device_register(dev);
	if (IS_ERR(data->class_dev)) {
		err = PTR_ERR(data->class_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;

	pdev = platform_device_alloc(DRVNAME, address);
	if (!pdev) {
		err = -ENOMEM;
		printk(KERN_ERR DRVNAME ": Device allocation failed\n");
		goto exit;
	}

	err = platform_device_add_resources(pdev, &res, 1);
	if (err) {
		printk(KERN_ERR DRVNAME ": Device resource addition failed "
		       "(%d)\n", err);
		goto exit_device_put;
	}

	err = platform_device_add(pdev);
	if (err) {
		printk(KERN_ERR DRVNAME ": 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;

	superio_enter();
	id = superio_inb(SUPERIO_REG_DEVID);

	if ((id != 0x6f) && (id != 0x81)) {
		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);

	printk(KERN_INFO DRVNAME ": found SMSC %s "
		"(base address 0x%04x, revision %u)\n",
		id == 0x81 ? "SCH5307-NS" : "LPC47B397-NC", *addr, rev);

	superio_exit();
	return 0;
}

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

	if ((ret = smsc47b397_find(&address)))
		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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	smsc47b397.c - Part of lm_sensors, Linux kernel modules
	3	for hardware monitoring
	4
	5	Supports the SMSC LPC47B397-NC Super-I/O chip.
	6
	7	Author/Maintainer: Mark M. Hoffman <mhoffman@lightlink.com>
	8	Copyright (C) 2004 Utilitek Systems, Inc.
	9
	10	derived in part from smsc47m1.c:
	11	Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
	12	Copyright (C) 2004 Jean Delvare <khali@linux-fr.org>
	13
	14	This program is free software; you can redistribute it and/or modify
	15	it under the terms of the GNU General Public License as published by
	16	the Free Software Foundation; either version 2 of the License, or
	17	(at your option) any later version.
	18
	19	This program is distributed in the hope that it will be useful,
	20	but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	GNU General Public License for more details.
	23
	24	You should have received a copy of the GNU General Public License
	25	along with this program; if not, write to the Free Software
	26	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	27	*/
	28
	29	#include <linux/module.h>
	30	#include <linux/slab.h>
	31	#include <linux/ioport.h>
	32	#include <linux/jiffies.h>
292fc1a5	33	#include <linux/platform_device.h>
943b0830 MH	34	#include <linux/hwmon.h>
943b0830 MH	35	#include <linux/err.h>
1da177e4	36	#include <linux/init.h>
9a61bf63	37	#include <linux/mutex.h>
1da177e4 LT	38	#include <asm/io.h>
1da177e4 LT	39
292fc1a5 JD	40	static struct platform_device *pdev;
	41
	42	#define DRVNAME "smsc47b397"
1da177e4 LT	43
	44	/* Super-I/0 registers and commands */
	45
	46	#define REG 0x2e /* The register to read/write */
	47	#define VAL 0x2f /* The value to read/write */
	48
	49	static inline void superio_outb(int reg, int val)
	50	{
	51	outb(reg, REG);
	52	outb(val, VAL);
	53	}
	54
	55	static inline int superio_inb(int reg)
	56	{
	57	outb(reg, REG);
	58	return inb(VAL);
	59	}
	60
	61	/* select superio logical device */
	62	static inline void superio_select(int ld)
	63	{
	64	superio_outb(0x07, ld);
	65	}
	66
	67	static inline void superio_enter(void)
	68	{
	69	outb(0x55, REG);
	70	}
	71
	72	static inline void superio_exit(void)
	73	{
	74	outb(0xAA, REG);
	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 JD	94	unsigned short addr;
292fc1a5 JD	95	const char *name;
943b0830	96	struct class_device *class_dev;
9a61bf63	97	struct mutex lock;
1da177e4	98
9a61bf63	99	struct mutex update_lock;
1da177e4 LT	100	unsigned long last_updated; /* in jiffies */
	101	int valid;
	102
	103	/* register values */
	104	u16 fan[4];
	105	u8 temp[4];
	106	};
	107
292fc1a5	108	static int smsc47b397_read_value(struct smsc47b397_data* data, u8 reg)
1da177e4	109	{
1da177e4 LT	110	int res;
1da177e4 LT	111
9a61bf63	112	mutex_lock(&data->lock);
292fc1a5 JD	113	outb(reg, data->addr);
292fc1a5 JD	114	res = inb_p(data->addr + 1);
9a61bf63	115	mutex_unlock(&data->lock);
1da177e4 LT	116	return res;
	117	}
	118
	119	static struct smsc47b397_data smsc47b397_update_device(struct device dev)
	120	{
292fc1a5	121	struct smsc47b397_data *data = dev_get_drvdata(dev);
1da177e4 LT	122	int i;
1da177e4 LT	123
9a61bf63	124	mutex_lock(&data->update_lock);
1da177e4 LT	125
1da177e4 LT	126	if (time_after(jiffies, data->last_updated + HZ) \|\| !data->valid) {
292fc1a5	127	dev_dbg(dev, "starting device update...\n");
1da177e4 LT	128
	129	/* 4 temperature inputs, 4 fan inputs */
	130	for (i = 0; i < 4; i++) {
292fc1a5	131	data->temp[i] = smsc47b397_read_value(data,
1da177e4 LT	132	SMSC47B397_REG_TEMP(i));
	133
	134	/* must read LSB first */
292fc1a5	135	data->fan[i] = smsc47b397_read_value(data,
1da177e4	136	SMSC47B397_REG_FAN_LSB(i));
292fc1a5	137	data->fan[i] \|= smsc47b397_read_value(data,
1da177e4 LT	138	SMSC47B397_REG_FAN_MSB(i)) << 8;
	139	}
	140
	141	data->last_updated = jiffies;
	142	data->valid = 1;
	143
292fc1a5	144	dev_dbg(dev, "... device update complete\n");
1da177e4 LT	145	}
1da177e4 LT	146
9a61bf63	147	mutex_unlock(&data->update_lock);
1da177e4 LT	148
	149	return data;
	150	}
	151
	152	/* TEMP: 0.001C/bit (-128C to +127C)
	153	REG: 1C/bit, two's complement */
	154	static int temp_from_reg(u8 reg)
	155	{
	156	return (s8)reg * 1000;
	157	}
	158
	159	/* 0 <= nr <= 3 */
	160	static ssize_t show_temp(struct device dev, char buf, int nr)
	161	{
	162	struct smsc47b397_data *data = smsc47b397_update_device(dev);
	163	return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr]));
	164	}
	165
	166	#define sysfs_temp(num) \
a5099cfc	167	static ssize_t show_temp##num(struct device dev, struct device_attribute attr, char *buf) \
1da177e4 LT	168	{ \
	169	return show_temp(dev, buf, num-1); \
	170	} \
	171	static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL)
	172
	173	sysfs_temp(1);
	174	sysfs_temp(2);
	175	sysfs_temp(3);
	176	sysfs_temp(4);
	177
1da177e4 LT	178	/* FAN: 1 RPM/bit
	179	REG: count of 90kHz pulses / revolution */
	180	static int fan_from_reg(u16 reg)
	181	{
	182	return 90000 * 60 / reg;
	183	}
	184
	185	/* 0 <= nr <= 3 */
	186	static ssize_t show_fan(struct device dev, char buf, int nr)
	187	{
	188	struct smsc47b397_data *data = smsc47b397_update_device(dev);
	189	return sprintf(buf, "%d\n", fan_from_reg(data->fan[nr]));
	190	}
	191
	192	#define sysfs_fan(num) \
a5099cfc	193	static ssize_t show_fan##num(struct device dev, struct device_attribute attr, char *buf) \
1da177e4 LT	194	{ \
	195	return show_fan(dev, buf, num-1); \
	196	} \
	197	static DEVICE_ATTR(fan##num##_input, S_IRUGO, show_fan##num, NULL)
	198
	199	sysfs_fan(1);
	200	sysfs_fan(2);
	201	sysfs_fan(3);
	202	sysfs_fan(4);
	203
292fc1a5 JD	204	static ssize_t show_name(struct device *dev, struct device_attribute
	205	devattr, char buf)
	206	{
	207	struct smsc47b397_data *data = dev_get_drvdata(dev);
	208	return sprintf(buf, "%s\n", data->name);
	209	}
	210	static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
	211
c1685f61 MH	212	static struct attribute *smsc47b397_attributes[] = {
	213	&dev_attr_temp1_input.attr,
	214	&dev_attr_temp2_input.attr,
	215	&dev_attr_temp3_input.attr,
	216	&dev_attr_temp4_input.attr,
	217	&dev_attr_fan1_input.attr,
	218	&dev_attr_fan2_input.attr,
	219	&dev_attr_fan3_input.attr,
	220	&dev_attr_fan4_input.attr,
	221
292fc1a5	222	&dev_attr_name.attr,
c1685f61 MH	223	NULL
	224	};
	225
	226	static const struct attribute_group smsc47b397_group = {
	227	.attrs = smsc47b397_attributes,
	228	};
1da177e4	229
292fc1a5	230	static int __devexit smsc47b397_remove(struct platform_device *pdev)
1da177e4	231	{
292fc1a5 JD	232	struct smsc47b397_data *data = platform_get_drvdata(pdev);
292fc1a5 JD	233	struct resource *res;
1da177e4	234
943b0830	235	hwmon_device_unregister(data->class_dev);
292fc1a5 JD	236	sysfs_remove_group(&pdev->dev.kobj, &smsc47b397_group);
	237	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	238	release_region(res->start, SMSC_EXTENT);
943b0830	239	kfree(data);
1da177e4 LT	240
	241	return 0;
	242	}
	243
292fc1a5	244	static int smsc47b397_probe(struct platform_device *pdev);
2d8672c5	245
292fc1a5	246	static struct platform_driver smsc47b397_driver = {
cdaf7934	247	.driver = {
87218842	248	.owner = THIS_MODULE,
292fc1a5	249	.name = DRVNAME,
cdaf7934	250	},
292fc1a5 JD	251	.probe = smsc47b397_probe,
292fc1a5 JD	252	.remove = __devexit_p(smsc47b397_remove),
1da177e4 LT	253	};
1da177e4 LT	254
292fc1a5	255	static int __devinit smsc47b397_probe(struct platform_device *pdev)
1da177e4	256	{
292fc1a5	257	struct device *dev = &pdev->dev;
1da177e4	258	struct smsc47b397_data *data;
292fc1a5	259	struct resource *res;
1da177e4 LT	260	int err = 0;
1da177e4 LT	261
292fc1a5 JD	262	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
292fc1a5 JD	263	if (!request_region(res->start, SMSC_EXTENT,
cdaf7934	264	smsc47b397_driver.driver.name)) {
292fc1a5 JD	265	dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
	266	(unsigned long)res->start,
	267	(unsigned long)res->start + SMSC_EXTENT - 1);
1da177e4 LT	268	return -EBUSY;
	269	}
	270
ba9c2e8d	271	if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) {
1da177e4 LT	272	err = -ENOMEM;
	273	goto error_release;
	274	}
1da177e4	275
292fc1a5 JD	276	data->addr = res->start;
292fc1a5 JD	277	data->name = "smsc47b397";
9a61bf63	278	mutex_init(&data->lock);
9a61bf63	279	mutex_init(&data->update_lock);
292fc1a5	280	platform_set_drvdata(pdev, data);
1da177e4	281
292fc1a5	282	if ((err = sysfs_create_group(&dev->kobj, &smsc47b397_group)))
1da177e4 LT	283	goto error_free;
1da177e4 LT	284
292fc1a5	285	data->class_dev = hwmon_device_register(dev);
943b0830 MH	286	if (IS_ERR(data->class_dev)) {
943b0830 MH	287	err = PTR_ERR(data->class_dev);
c1685f61	288	goto error_remove;
943b0830 MH	289	}
943b0830 MH	290
1da177e4 LT	291	return 0;
1da177e4 LT	292
c1685f61	293	error_remove:
292fc1a5	294	sysfs_remove_group(&dev->kobj, &smsc47b397_group);
1da177e4	295	error_free:
1f57ff89	296	kfree(data);
1da177e4	297	error_release:
292fc1a5 JD	298	release_region(res->start, SMSC_EXTENT);
	299	return err;
	300	}
	301
	302	static int __init smsc47b397_device_add(unsigned short address)
	303	{
	304	struct resource res = {
	305	.start = address,
	306	.end = address + SMSC_EXTENT - 1,
	307	.name = DRVNAME,
	308	.flags = IORESOURCE_IO,
	309	};
	310	int err;
	311
	312	pdev = platform_device_alloc(DRVNAME, address);
	313	if (!pdev) {
	314	err = -ENOMEM;
	315	printk(KERN_ERR DRVNAME ": Device allocation failed\n");
	316	goto exit;
	317	}
	318
	319	err = platform_device_add_resources(pdev, &res, 1);
	320	if (err) {
	321	printk(KERN_ERR DRVNAME ": Device resource addition failed "
	322	"(%d)\n", err);
	323	goto exit_device_put;
	324	}
	325
	326	err = platform_device_add(pdev);
	327	if (err) {
	328	printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
	329	err);
	330	goto exit_device_put;
	331	}
	332
	333	return 0;
	334
	335	exit_device_put:
	336	platform_device_put(pdev);
	337	exit:
1da177e4 LT	338	return err;
	339	}
	340
2d8672c5	341	static int __init smsc47b397_find(unsigned short *addr)
1da177e4 LT	342	{
	343	u8 id, rev;
	344
	345	superio_enter();
	346	id = superio_inb(SUPERIO_REG_DEVID);
	347
7ab83a91	348	if ((id != 0x6f) && (id != 0x81)) {
1da177e4 LT	349	superio_exit();
	350	return -ENODEV;
	351	}
	352
	353	rev = superio_inb(SUPERIO_REG_DEVREV);
	354
	355	superio_select(SUPERIO_REG_LD8);
	356	*addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
	357	\| superio_inb(SUPERIO_REG_BASE_LSB);
	358
292fc1a5	359	printk(KERN_INFO DRVNAME ": found SMSC %s "
7ab83a91 MH	360	"(base address 0x%04x, revision %u)\n",
7ab83a91 MH	361	id == 0x81 ? "SCH5307-NS" : "LPC47B397-NC", *addr, rev);
1da177e4 LT	362
	363	superio_exit();
	364	return 0;
	365	}
	366
	367	static int __init smsc47b397_init(void)
	368	{
292fc1a5	369	unsigned short address;
1da177e4 LT	370	int ret;
1da177e4 LT	371
2d8672c5	372	if ((ret = smsc47b397_find(&address)))
1da177e4 LT	373	return ret;
1da177e4 LT	374
292fc1a5 JD	375	ret = platform_driver_register(&smsc47b397_driver);
	376	if (ret)
	377	goto exit;
	378
	379	/* Sets global pdev as a side effect */
	380	ret = smsc47b397_device_add(address);
	381	if (ret)
	382	goto exit_driver;
	383
	384	return 0;
	385
	386	exit_driver:
	387	platform_driver_unregister(&smsc47b397_driver);
	388	exit:
	389	return ret;
1da177e4 LT	390	}
	391
	392	static void __exit smsc47b397_exit(void)
	393	{
292fc1a5 JD	394	platform_device_unregister(pdev);
292fc1a5 JD	395	platform_driver_unregister(&smsc47b397_driver);
1da177e4 LT	396	}
	397
	398	MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
	399	MODULE_DESCRIPTION("SMSC LPC47B397 driver");
	400	MODULE_LICENSE("GPL");
	401
	402	module_init(smsc47b397_init);
	403	module_exit(smsc47b397_exit);