[linux-2.6-block.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 <jdelvare@suse.de>
 *
 * 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 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);
Commit	Line	Data
1da177e4	1	/*
2a52dd66 GR	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>
7c81c60f	12	* Copyright (C) 2004 Jean Delvare <jdelvare@suse.de>
2a52dd66 GR	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	*/
1da177e4	28
bf1a85ef JP	29	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
bf1a85ef JP	30
1da177e4 LT	31	#include <linux/module.h>
	32	#include <linux/slab.h>
	33	#include <linux/ioport.h>
	34	#include <linux/jiffies.h>
292fc1a5	35	#include <linux/platform_device.h>
943b0830	36	#include <linux/hwmon.h>
3659a017	37	#include <linux/hwmon-sysfs.h>
943b0830	38	#include <linux/err.h>
1da177e4	39	#include <linux/init.h>
9a61bf63	40	#include <linux/mutex.h>
b9acb64a	41	#include <linux/acpi.h>
6055fae8	42	#include <linux/io.h>
1da177e4	43
67b671bc JD	44	static unsigned short force_id;
	45	module_param(force_id, ushort, 0);
	46	MODULE_PARM_DESC(force_id, "Override the detected device ID");
	47
292fc1a5 JD	48	static struct platform_device *pdev;
	49
	50	#define DRVNAME "smsc47b397"
1da177e4 LT	51
	52	/* Super-I/0 registers and commands */
	53
	54	#define REG 0x2e /* The register to read/write */
	55	#define VAL 0x2f /* The value to read/write */
	56
	57	static inline void superio_outb(int reg, int val)
	58	{
	59	outb(reg, REG);
	60	outb(val, VAL);
	61	}
	62
	63	static inline int superio_inb(int reg)
	64	{
	65	outb(reg, REG);
	66	return inb(VAL);
	67	}
	68
	69	/* select superio logical device */
	70	static inline void superio_select(int ld)
	71	{
	72	superio_outb(0x07, ld);
	73	}
	74
8c082675	75	static inline int superio_enter(void)
1da177e4	76	{
8c082675 GR	77	if (!request_muxed_region(REG, 2, DRVNAME))
	78	return -EBUSY;
	79
1da177e4	80	outb(0x55, REG);
8c082675	81	return 0;
1da177e4 LT	82	}
	83
	84	static inline void superio_exit(void)
	85	{
	86	outb(0xAA, REG);
8c082675	87	release_region(REG, 2);
1da177e4 LT	88	}
	89
	90	#define SUPERIO_REG_DEVID 0x20
	91	#define SUPERIO_REG_DEVREV 0x21
	92	#define SUPERIO_REG_BASE_MSB 0x60
	93	#define SUPERIO_REG_BASE_LSB 0x61
	94	#define SUPERIO_REG_LD8 0x08
	95
	96	#define SMSC_EXTENT 0x02
	97
	98	/* 0 <= nr <= 3 */
	99	static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
	100	#define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)])
	101
	102	/* 0 <= nr <= 3 */
	103	#define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
	104	#define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))
	105
	106	struct smsc47b397_data {
292fc1a5	107	unsigned short addr;
9a61bf63	108	struct mutex lock;
1da177e4	109
9a61bf63	110	struct mutex update_lock;
1da177e4 LT	111	unsigned long last_updated; /* in jiffies */
	112	int valid;
	113
	114	/* register values */
	115	u16 fan[4];
	116	u8 temp[4];
	117	};
	118
371f2e08	119	static int smsc47b397_read_value(struct smsc47b397_data *data, u8 reg)
1da177e4	120	{
1da177e4 LT	121	int res;
1da177e4 LT	122
9a61bf63	123	mutex_lock(&data->lock);
292fc1a5 JD	124	outb(reg, data->addr);
292fc1a5 JD	125	res = inb_p(data->addr + 1);
9a61bf63	126	mutex_unlock(&data->lock);
1da177e4 LT	127	return res;
	128	}
	129
	130	static struct smsc47b397_data smsc47b397_update_device(struct device dev)
	131	{
292fc1a5	132	struct smsc47b397_data *data = dev_get_drvdata(dev);
1da177e4 LT	133	int i;
1da177e4 LT	134
9a61bf63	135	mutex_lock(&data->update_lock);
1da177e4 LT	136
1da177e4 LT	137	if (time_after(jiffies, data->last_updated + HZ) \|\| !data->valid) {
292fc1a5	138	dev_dbg(dev, "starting device update...\n");
1da177e4 LT	139
	140	/* 4 temperature inputs, 4 fan inputs */
	141	for (i = 0; i < 4; i++) {
292fc1a5	142	data->temp[i] = smsc47b397_read_value(data,
1da177e4 LT	143	SMSC47B397_REG_TEMP(i));
	144
	145	/* must read LSB first */
292fc1a5	146	data->fan[i] = smsc47b397_read_value(data,
1da177e4	147	SMSC47B397_REG_FAN_LSB(i));
292fc1a5	148	data->fan[i] \|= smsc47b397_read_value(data,
1da177e4 LT	149	SMSC47B397_REG_FAN_MSB(i)) << 8;
	150	}
	151
	152	data->last_updated = jiffies;
	153	data->valid = 1;
	154
292fc1a5	155	dev_dbg(dev, "... device update complete\n");
1da177e4 LT	156	}
1da177e4 LT	157
9a61bf63	158	mutex_unlock(&data->update_lock);
1da177e4 LT	159
	160	return data;
	161	}
	162
2a52dd66 GR	163	/*
	164	* TEMP: 0.001C/bit (-128C to +127C)
	165	* REG: 1C/bit, two's complement
	166	*/
1da177e4 LT	167	static int temp_from_reg(u8 reg)
	168	{
	169	return (s8)reg * 1000;
	170	}
	171
8721bdec GR	172	static ssize_t temp_show(struct device dev, struct device_attribute devattr,
8721bdec GR	173	char *buf)
1da177e4	174	{
3659a017	175	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
1da177e4	176	struct smsc47b397_data *data = smsc47b397_update_device(dev);
3659a017	177	return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
1da177e4 LT	178	}
1da177e4 LT	179
8721bdec GR	180	static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
	181	static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
	182	static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
	183	static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
1da177e4	184
2a52dd66 GR	185	/*
	186	* FAN: 1 RPM/bit
	187	* REG: count of 90kHz pulses / revolution
	188	*/
1da177e4 LT	189	static int fan_from_reg(u16 reg)
1da177e4 LT	190	{
90205c6c JD	191	if (reg == 0 \|\| reg == 0xffff)
90205c6c JD	192	return 0;
1da177e4 LT	193	return 90000 * 60 / reg;
	194	}
	195
8721bdec GR	196	static ssize_t fan_show(struct device dev, struct device_attribute devattr,
8721bdec GR	197	char *buf)
1da177e4	198	{
3659a017 JD	199	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	200	struct smsc47b397_data *data = smsc47b397_update_device(dev);
	201	return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index]));
1da177e4	202	}
8721bdec GR	203	static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
	204	static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
	205	static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2);
	206	static SENSOR_DEVICE_ATTR_RO(fan4_input, fan, 3);
1da177e4	207
9b993e36	208	static struct attribute *smsc47b397_attrs[] = {
3659a017 JD	209	&sensor_dev_attr_temp1_input.dev_attr.attr,
	210	&sensor_dev_attr_temp2_input.dev_attr.attr,
	211	&sensor_dev_attr_temp3_input.dev_attr.attr,
	212	&sensor_dev_attr_temp4_input.dev_attr.attr,
	213	&sensor_dev_attr_fan1_input.dev_attr.attr,
	214	&sensor_dev_attr_fan2_input.dev_attr.attr,
	215	&sensor_dev_attr_fan3_input.dev_attr.attr,
	216	&sensor_dev_attr_fan4_input.dev_attr.attr,
c1685f61 MH	217
	218	NULL
	219	};
	220
9b993e36	221	ATTRIBUTE_GROUPS(smsc47b397);
1da177e4	222
292fc1a5	223	static int smsc47b397_probe(struct platform_device *pdev);
2d8672c5	224
292fc1a5	225	static struct platform_driver smsc47b397_driver = {
cdaf7934	226	.driver = {
292fc1a5	227	.name = DRVNAME,
cdaf7934	228	},
292fc1a5	229	.probe = smsc47b397_probe,
1da177e4 LT	230	};
1da177e4 LT	231
6c931ae1	232	static int smsc47b397_probe(struct platform_device *pdev)
1da177e4	233	{
292fc1a5	234	struct device *dev = &pdev->dev;
1da177e4	235	struct smsc47b397_data *data;
9b993e36	236	struct device *hwmon_dev;
292fc1a5	237	struct resource *res;
1da177e4	238
292fc1a5	239	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
e43d5fef GR	240	if (!devm_request_region(dev, res->start, SMSC_EXTENT,
e43d5fef GR	241	smsc47b397_driver.driver.name)) {
292fc1a5 JD	242	dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
	243	(unsigned long)res->start,
	244	(unsigned long)res->start + SMSC_EXTENT - 1);
1da177e4 LT	245	return -EBUSY;
	246	}
	247
e43d5fef GR	248	data = devm_kzalloc(dev, sizeof(struct smsc47b397_data), GFP_KERNEL);
	249	if (!data)
	250	return -ENOMEM;
1da177e4	251
292fc1a5	252	data->addr = res->start;
9a61bf63	253	mutex_init(&data->lock);
9a61bf63	254	mutex_init(&data->update_lock);
1da177e4	255
9b993e36 AL	256	hwmon_dev = devm_hwmon_device_register_with_groups(dev, "smsc47b397",
	257	data,
	258	smsc47b397_groups);
	259	return PTR_ERR_OR_ZERO(hwmon_dev);
292fc1a5 JD	260	}
	261
	262	static int __init smsc47b397_device_add(unsigned short address)
	263	{
	264	struct resource res = {
	265	.start = address,
	266	.end = address + SMSC_EXTENT - 1,
	267	.name = DRVNAME,
	268	.flags = IORESOURCE_IO,
	269	};
	270	int err;
	271
b9acb64a JD	272	err = acpi_check_resource_conflict(&res);
	273	if (err)
	274	goto exit;
	275
292fc1a5 JD	276	pdev = platform_device_alloc(DRVNAME, address);
	277	if (!pdev) {
	278	err = -ENOMEM;
bf1a85ef	279	pr_err("Device allocation failed\n");
292fc1a5 JD	280	goto exit;
	281	}
	282
	283	err = platform_device_add_resources(pdev, &res, 1);
	284	if (err) {
bf1a85ef	285	pr_err("Device resource addition failed (%d)\n", err);
292fc1a5 JD	286	goto exit_device_put;
	287	}
	288
	289	err = platform_device_add(pdev);
	290	if (err) {
bf1a85ef	291	pr_err("Device addition failed (%d)\n", err);
292fc1a5 JD	292	goto exit_device_put;
	293	}
	294
	295	return 0;
	296
	297	exit_device_put:
	298	platform_device_put(pdev);
	299	exit:
1da177e4 LT	300	return err;
	301	}
	302
8528e07e	303	static int __init smsc47b397_find(void)
1da177e4 LT	304	{
1da177e4 LT	305	u8 id, rev;
80930776	306	char *name;
8528e07e	307	unsigned short addr;
8c082675 GR	308	int err;
	309
	310	err = superio_enter();
	311	if (err)
	312	return err;
1da177e4	313
67b671bc	314	id = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);
1da177e4	315
371f2e08	316	switch (id) {
80930776 CK	317	case 0x81:
	318	name = "SCH5307-NS";
	319	break;
	320	case 0x6f:
	321	name = "LPC47B397-NC";
	322	break;
	323	case 0x85:
	324	case 0x8c:
	325	name = "SCH5317";
	326	break;
	327	default:
1da177e4 LT	328	superio_exit();
	329	return -ENODEV;
	330	}
	331
	332	rev = superio_inb(SUPERIO_REG_DEVREV);
	333
	334	superio_select(SUPERIO_REG_LD8);
8528e07e	335	addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
1da177e4 LT	336	\| superio_inb(SUPERIO_REG_BASE_LSB);
1da177e4 LT	337
bf1a85ef	338	pr_info("found SMSC %s (base address 0x%04x, revision %u)\n",
8528e07e	339	name, addr, rev);
1da177e4 LT	340
1da177e4 LT	341	superio_exit();
8528e07e	342	return addr;
1da177e4 LT	343	}
	344
	345	static int __init smsc47b397_init(void)
	346	{
292fc1a5	347	unsigned short address;
1da177e4 LT	348	int ret;
1da177e4 LT	349
8528e07e GR	350	ret = smsc47b397_find();
8528e07e GR	351	if (ret < 0)
1da177e4	352	return ret;
8528e07e	353	address = ret;
1da177e4	354
292fc1a5 JD	355	ret = platform_driver_register(&smsc47b397_driver);
	356	if (ret)
	357	goto exit;
	358
	359	/* Sets global pdev as a side effect */
	360	ret = smsc47b397_device_add(address);
	361	if (ret)
	362	goto exit_driver;
	363
	364	return 0;
	365
	366	exit_driver:
	367	platform_driver_unregister(&smsc47b397_driver);
	368	exit:
	369	return ret;
1da177e4 LT	370	}
	371
	372	static void __exit smsc47b397_exit(void)
	373	{
292fc1a5 JD	374	platform_device_unregister(pdev);
292fc1a5 JD	375	platform_driver_unregister(&smsc47b397_driver);
1da177e4 LT	376	}
	377
	378	MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
	379	MODULE_DESCRIPTION("SMSC LPC47B397 driver");
	380	MODULE_LICENSE("GPL");
	381
	382	module_init(smsc47b397_init);
	383	module_exit(smsc47b397_exit);