Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 949 insertions, 0 deletions

diff --git a/drivers/hwmon/smsc47m1.c b/drivers/hwmon/smsc47m1.c
new file mode 100644
index 000000000..37531b5c8
--- /dev/null
+++ b/drivers/hwmon/smsc47m1.c
@@ -0,0 +1,949 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * smsc47m1.c - Part of lm_sensors, Linux kernel modules
+ *		for hardware monitoring
+ *
+ * Supports the SMSC LPC47B27x, LPC47M10x, LPC47M112, LPC47M13x,
+ * LPC47M14x, LPC47M15x, LPC47M192, LPC47M292 and LPC47M997
+ * Super-I/O chips.
+ *
+ * Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
+ * Copyright (C) 2004-2007 Jean Delvare <jdelvare@suse.de>
+ * Ported to Linux 2.6 by Gabriele Gorla <gorlik@yahoo.com>
+ *			and Jean Delvare
+ */
+
+#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/sysfs.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 "smsc47m1"
+enum chips { smsc47m1, smsc47m2 };
+
+/* 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);
+}
+
+/* logical device for fans is 0x0A */
+#define superio_select() superio_outb(0x07, 0x0A)
+
+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_ACT		0x30
+#define SUPERIO_REG_BASE	0x60
+#define SUPERIO_REG_DEVID	0x20
+#define SUPERIO_REG_DEVREV	0x21
+
+/* Logical device registers */
+
+#define SMSC_EXTENT		0x80
+
+/* nr is 0 or 1 in the macros below */
+#define SMSC47M1_REG_ALARM		0x04
+#define SMSC47M1_REG_TPIN(nr)		(0x34 - (nr))
+#define SMSC47M1_REG_PPIN(nr)		(0x36 - (nr))
+#define SMSC47M1_REG_FANDIV		0x58
+
+static const u8 SMSC47M1_REG_FAN[3]		= { 0x59, 0x5a, 0x6b };
+static const u8 SMSC47M1_REG_FAN_PRELOAD[3]	= { 0x5b, 0x5c, 0x6c };
+static const u8 SMSC47M1_REG_PWM[3]		= { 0x56, 0x57, 0x69 };
+
+#define SMSC47M2_REG_ALARM6		0x09
+#define SMSC47M2_REG_TPIN1		0x38
+#define SMSC47M2_REG_TPIN2		0x37
+#define SMSC47M2_REG_TPIN3		0x2d
+#define SMSC47M2_REG_PPIN3		0x2c
+#define SMSC47M2_REG_FANDIV3		0x6a
+
+#define MIN_FROM_REG(reg, div)		((reg) >= 192 ? 0 : \
+					 983040 / ((192 - (reg)) * (div)))
+#define FAN_FROM_REG(reg, div, preload)	((reg) <= (preload) || (reg) == 255 ? \
+					 0 : \
+					 983040 / (((reg) - (preload)) * (div)))
+#define DIV_FROM_REG(reg)		(1 << (reg))
+#define PWM_FROM_REG(reg)		(((reg) & 0x7E) << 1)
+#define PWM_EN_FROM_REG(reg)		((~(reg)) & 0x01)
+#define PWM_TO_REG(reg)			(((reg) >> 1) & 0x7E)
+
+struct smsc47m1_data {
+	unsigned short addr;
+	const char *name;
+	enum chips type;
+	struct device *hwmon_dev;
+
+	struct mutex update_lock;
+	unsigned long last_updated;	/* In jiffies */
+
+	u8 fan[3];		/* Register value */
+	u8 fan_preload[3];	/* Register value */
+	u8 fan_div[3];		/* Register encoding, shifted right */
+	u8 alarms;		/* Register encoding */
+	u8 pwm[3];		/* Register value (bit 0 is disable) */
+};
+
+struct smsc47m1_sio_data {
+	enum chips type;
+	u8 activate;		/* Remember initial device state */
+};
+
+static inline int smsc47m1_read_value(struct smsc47m1_data *data, u8 reg)
+{
+	return inb_p(data->addr + reg);
+}
+
+static inline void smsc47m1_write_value(struct smsc47m1_data *data, u8 reg,
+		u8 value)
+{
+	outb_p(value, data->addr + reg);
+}
+
+static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
+		int init)
+{
+	struct smsc47m1_data *data = dev_get_drvdata(dev);
+
+	mutex_lock(&data->update_lock);
+
+	if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || init) {
+		int i, fan_nr;
+		fan_nr = data->type == smsc47m2 ? 3 : 2;
+
+		for (i = 0; i < fan_nr; i++) {
+			data->fan[i] = smsc47m1_read_value(data,
+				       SMSC47M1_REG_FAN[i]);
+			data->fan_preload[i] = smsc47m1_read_value(data,
+					       SMSC47M1_REG_FAN_PRELOAD[i]);
+			data->pwm[i] = smsc47m1_read_value(data,
+				       SMSC47M1_REG_PWM[i]);
+		}
+
+		i = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV);
+		data->fan_div[0] = (i >> 4) & 0x03;
+		data->fan_div[1] = i >> 6;
+
+		data->alarms = smsc47m1_read_value(data,
+			       SMSC47M1_REG_ALARM) >> 6;
+		/* Clear alarms if needed */
+		if (data->alarms)
+			smsc47m1_write_value(data, SMSC47M1_REG_ALARM, 0xC0);
+
+		if (fan_nr >= 3) {
+			data->fan_div[2] = (smsc47m1_read_value(data,
+					    SMSC47M2_REG_FANDIV3) >> 4) & 0x03;
+			data->alarms |= (smsc47m1_read_value(data,
+					 SMSC47M2_REG_ALARM6) & 0x40) >> 4;
+			/* Clear alarm if needed */
+			if (data->alarms & 0x04)
+				smsc47m1_write_value(data,
+						     SMSC47M2_REG_ALARM6,
+						     0x40);
+		}
+
+		data->last_updated = jiffies;
+	}
+
+	mutex_unlock(&data->update_lock);
+	return data;
+}
+
+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 smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+	int nr = attr->index;
+	/*
+	 * This chip (stupidly) stops monitoring fan speed if PWM is
+	 * enabled and duty cycle is 0%. This is fine if the monitoring
+	 * and control concern the same fan, but troublesome if they are
+	 * not (which could as well happen).
+	 */
+	int rpm = (data->pwm[nr] & 0x7F) == 0x00 ? 0 :
+		  FAN_FROM_REG(data->fan[nr],
+			       DIV_FROM_REG(data->fan_div[nr]),
+			       data->fan_preload[nr]);
+	return sprintf(buf, "%d\n", rpm);
+}
+
+static ssize_t fan_min_show(struct device *dev,
+			    struct device_attribute *devattr, char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+	int nr = attr->index;
+	int rpm = MIN_FROM_REG(data->fan_preload[nr],
+			       DIV_FROM_REG(data->fan_div[nr]));
+	return sprintf(buf, "%d\n", rpm);
+}
+
+static ssize_t fan_div_show(struct device *dev,
+			    struct device_attribute *devattr, char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
+}
+
+static ssize_t fan_alarm_show(struct device *dev,
+			      struct device_attribute *devattr, char *buf)
+{
+	int bitnr = to_sensor_dev_attr(devattr)->index;
+	struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
+}
+
+static ssize_t pwm_show(struct device *dev, struct device_attribute *devattr,
+			char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+	return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm[attr->index]));
+}
+
+static ssize_t pwm_en_show(struct device *dev,
+			   struct device_attribute *devattr, char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+	return sprintf(buf, "%d\n", PWM_EN_FROM_REG(data->pwm[attr->index]));
+}
+
+static ssize_t alarms_show(struct device *dev,
+			   struct device_attribute *devattr, char *buf)
+{
+	struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+	return sprintf(buf, "%d\n", data->alarms);
+}
+
+static ssize_t fan_min_store(struct device *dev,
+			     struct device_attribute *devattr,
+			     const char *buf, size_t count)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct smsc47m1_data *data = dev_get_drvdata(dev);
+	int nr = attr->index;
+	long rpmdiv;
+	long val;
+	int err;
+
+	err = kstrtol(buf, 10, &val);
+	if (err)
+		return err;
+
+	mutex_lock(&data->update_lock);
+	rpmdiv = val * DIV_FROM_REG(data->fan_div[nr]);
+
+	if (983040 > 192 * rpmdiv || 2 * rpmdiv > 983040) {
+		mutex_unlock(&data->update_lock);
+		return -EINVAL;
+	}
+
+	data->fan_preload[nr] = 192 - ((983040 + rpmdiv / 2) / rpmdiv);
+	smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr],
+			     data->fan_preload[nr]);
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+/*
+ * Note: we save and restore the fan minimum here, because its value is
+ * determined in part by the fan clock divider.  This follows the principle
+ * of least surprise; the user doesn't expect the fan minimum to change just
+ * because the divider changed.
+ */
+static ssize_t fan_div_store(struct device *dev,
+			     struct device_attribute *devattr,
+			     const char *buf, size_t count)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct smsc47m1_data *data = dev_get_drvdata(dev);
+	int nr = attr->index;
+	long new_div;
+	int err;
+	long tmp;
+	u8 old_div = DIV_FROM_REG(data->fan_div[nr]);
+
+	err = kstrtol(buf, 10, &new_div);
+	if (err)
+		return err;
+
+	if (new_div == old_div) /* No change */
+		return count;
+
+	mutex_lock(&data->update_lock);
+	switch (new_div) {
+	case 1:
+		data->fan_div[nr] = 0;
+		break;
+	case 2:
+		data->fan_div[nr] = 1;
+		break;
+	case 4:
+		data->fan_div[nr] = 2;
+		break;
+	case 8:
+		data->fan_div[nr] = 3;
+		break;
+	default:
+		mutex_unlock(&data->update_lock);
+		return -EINVAL;
+	}
+
+	switch (nr) {
+	case 0:
+	case 1:
+		tmp = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV)
+		      & ~(0x03 << (4 + 2 * nr));
+		tmp |= data->fan_div[nr] << (4 + 2 * nr);
+		smsc47m1_write_value(data, SMSC47M1_REG_FANDIV, tmp);
+		break;
+	case 2:
+		tmp = smsc47m1_read_value(data, SMSC47M2_REG_FANDIV3) & 0xCF;
+		tmp |= data->fan_div[2] << 4;
+		smsc47m1_write_value(data, SMSC47M2_REG_FANDIV3, tmp);
+		break;
+	default:
+		BUG();
+	}
+
+	/* Preserve fan min */
+	tmp = 192 - (old_div * (192 - data->fan_preload[nr])
+		     + new_div / 2) / new_div;
+	data->fan_preload[nr] = clamp_val(tmp, 0, 191);
+	smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr],
+			     data->fan_preload[nr]);
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+static ssize_t pwm_store(struct device *dev, struct device_attribute *devattr,
+			 const char *buf, size_t count)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct smsc47m1_data *data = dev_get_drvdata(dev);
+	int nr = attr->index;
+	long val;
+	int err;
+
+	err = kstrtol(buf, 10, &val);
+	if (err)
+		return err;
+
+	if (val < 0 || val > 255)
+		return -EINVAL;
+
+	mutex_lock(&data->update_lock);
+	data->pwm[nr] &= 0x81; /* Preserve additional bits */
+	data->pwm[nr] |= PWM_TO_REG(val);
+	smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr],
+			     data->pwm[nr]);
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+static ssize_t pwm_en_store(struct device *dev,
+			    struct device_attribute *devattr, const char *buf,
+			    size_t count)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct smsc47m1_data *data = dev_get_drvdata(dev);
+	int nr = attr->index;
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+
+	if (val > 1)
+		return -EINVAL;
+
+	mutex_lock(&data->update_lock);
+	data->pwm[nr] &= 0xFE; /* preserve the other bits */
+	data->pwm[nr] |= !val;
+	smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr],
+			     data->pwm[nr]);
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
+static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
+static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
+static SENSOR_DEVICE_ATTR_RO(fan1_alarm, fan_alarm, 0);
+static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
+static SENSOR_DEVICE_ATTR_RW(pwm1_enable, pwm_en, 0);
+static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
+static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
+static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
+static SENSOR_DEVICE_ATTR_RO(fan2_alarm, fan_alarm, 1);
+static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1);
+static SENSOR_DEVICE_ATTR_RW(pwm2_enable, pwm_en, 1);
+static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2);
+static SENSOR_DEVICE_ATTR_RW(fan3_min, fan_min, 2);
+static SENSOR_DEVICE_ATTR_RW(fan3_div, fan_div, 2);
+static SENSOR_DEVICE_ATTR_RO(fan3_alarm, fan_alarm, 2);
+static SENSOR_DEVICE_ATTR_RW(pwm3, pwm, 2);
+static SENSOR_DEVICE_ATTR_RW(pwm3_enable, pwm_en, 2);
+
+static DEVICE_ATTR_RO(alarms);
+
+static ssize_t name_show(struct device *dev, struct device_attribute
+			 *devattr, char *buf)
+{
+	struct smsc47m1_data *data = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%s\n", data->name);
+}
+static DEVICE_ATTR_RO(name);
+
+static struct attribute *smsc47m1_attributes_fan1[] = {
+	&sensor_dev_attr_fan1_input.dev_attr.attr,
+	&sensor_dev_attr_fan1_min.dev_attr.attr,
+	&sensor_dev_attr_fan1_div.dev_attr.attr,
+	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group smsc47m1_group_fan1 = {
+	.attrs = smsc47m1_attributes_fan1,
+};
+
+static struct attribute *smsc47m1_attributes_fan2[] = {
+	&sensor_dev_attr_fan2_input.dev_attr.attr,
+	&sensor_dev_attr_fan2_min.dev_attr.attr,
+	&sensor_dev_attr_fan2_div.dev_attr.attr,
+	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group smsc47m1_group_fan2 = {
+	.attrs = smsc47m1_attributes_fan2,
+};
+
+static struct attribute *smsc47m1_attributes_fan3[] = {
+	&sensor_dev_attr_fan3_input.dev_attr.attr,
+	&sensor_dev_attr_fan3_min.dev_attr.attr,
+	&sensor_dev_attr_fan3_div.dev_attr.attr,
+	&sensor_dev_attr_fan3_alarm.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group smsc47m1_group_fan3 = {
+	.attrs = smsc47m1_attributes_fan3,
+};
+
+static struct attribute *smsc47m1_attributes_pwm1[] = {
+	&sensor_dev_attr_pwm1.dev_attr.attr,
+	&sensor_dev_attr_pwm1_enable.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group smsc47m1_group_pwm1 = {
+	.attrs = smsc47m1_attributes_pwm1,
+};
+
+static struct attribute *smsc47m1_attributes_pwm2[] = {
+	&sensor_dev_attr_pwm2.dev_attr.attr,
+	&sensor_dev_attr_pwm2_enable.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group smsc47m1_group_pwm2 = {
+	.attrs = smsc47m1_attributes_pwm2,
+};
+
+static struct attribute *smsc47m1_attributes_pwm3[] = {
+	&sensor_dev_attr_pwm3.dev_attr.attr,
+	&sensor_dev_attr_pwm3_enable.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group smsc47m1_group_pwm3 = {
+	.attrs = smsc47m1_attributes_pwm3,
+};
+
+static struct attribute *smsc47m1_attributes[] = {
+	&dev_attr_alarms.attr,
+	&dev_attr_name.attr,
+	NULL
+};
+
+static const struct attribute_group smsc47m1_group = {
+	.attrs = smsc47m1_attributes,
+};
+
+static int __init smsc47m1_find(struct smsc47m1_sio_data *sio_data)
+{
+	u8 val;
+	unsigned short addr;
+	int err;
+
+	err = superio_enter();
+	if (err)
+		return err;
+
+	val = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);
+
+	/*
+	 * SMSC LPC47M10x/LPC47M112/LPC47M13x (device id 0x59), LPC47M14x
+	 * (device id 0x5F) and LPC47B27x (device id 0x51) have fan control.
+	 * The LPC47M15x and LPC47M192 chips "with hardware monitoring block"
+	 * can do much more besides (device id 0x60).
+	 * The LPC47M997 is undocumented, but seems to be compatible with
+	 * the LPC47M192, and has the same device id.
+	 * The LPC47M292 (device id 0x6B) is somewhat compatible, but it
+	 * supports a 3rd fan, and the pin configuration registers are
+	 * unfortunately different.
+	 * The LPC47M233 has the same device id (0x6B) but is not compatible.
+	 * We check the high bit of the device revision register to
+	 * differentiate them.
+	 */
+	switch (val) {
+	case 0x51:
+		pr_info("Found SMSC LPC47B27x\n");
+		sio_data->type = smsc47m1;
+		break;
+	case 0x59:
+		pr_info("Found SMSC LPC47M10x/LPC47M112/LPC47M13x\n");
+		sio_data->type = smsc47m1;
+		break;
+	case 0x5F:
+		pr_info("Found SMSC LPC47M14x\n");
+		sio_data->type = smsc47m1;
+		break;
+	case 0x60:
+		pr_info("Found SMSC LPC47M15x/LPC47M192/LPC47M997\n");
+		sio_data->type = smsc47m1;
+		break;
+	case 0x6B:
+		if (superio_inb(SUPERIO_REG_DEVREV) & 0x80) {
+			pr_debug("Found SMSC LPC47M233, unsupported\n");
+			superio_exit();
+			return -ENODEV;
+		}
+
+		pr_info("Found SMSC LPC47M292\n");
+		sio_data->type = smsc47m2;
+		break;
+	default:
+		superio_exit();
+		return -ENODEV;
+	}
+
+	superio_select();
+	addr = (superio_inb(SUPERIO_REG_BASE) << 8)
+	      |  superio_inb(SUPERIO_REG_BASE + 1);
+	if (addr == 0) {
+		pr_info("Device address not set, will not use\n");
+		superio_exit();
+		return -ENODEV;
+	}
+
+	/*
+	 * Enable only if address is set (needed at least on the
+	 * Compaq Presario S4000NX)
+	 */
+	sio_data->activate = superio_inb(SUPERIO_REG_ACT);
+	if ((sio_data->activate & 0x01) == 0) {
+		pr_info("Enabling device\n");
+		superio_outb(SUPERIO_REG_ACT, sio_data->activate | 0x01);
+	}
+
+	superio_exit();
+	return addr;
+}
+
+/* Restore device to its initial state */
+static void smsc47m1_restore(const struct smsc47m1_sio_data *sio_data)
+{
+	if ((sio_data->activate & 0x01) == 0) {
+		if (!superio_enter()) {
+			superio_select();
+			pr_info("Disabling device\n");
+			superio_outb(SUPERIO_REG_ACT, sio_data->activate);
+			superio_exit();
+		} else {
+			pr_warn("Failed to disable device\n");
+		}
+	}
+}
+
+#define CHECK		1
+#define REQUEST		2
+
+/*
+ * This function can be used to:
+ *  - test for resource conflicts with ACPI
+ *  - request the resources
+ * We only allocate the I/O ports we really need, to minimize the risk of
+ * conflicts with ACPI or with other drivers.
+ */
+static int __init smsc47m1_handle_resources(unsigned short address,
+					    enum chips type, int action,
+					    struct device *dev)
+{
+	static const u8 ports_m1[] = {
+		/* register, region length */
+		0x04, 1,
+		0x33, 4,
+		0x56, 7,
+	};
+
+	static const u8 ports_m2[] = {
+		/* register, region length */
+		0x04, 1,
+		0x09, 1,
+		0x2c, 2,
+		0x35, 4,
+		0x56, 7,
+		0x69, 4,
+	};
+
+	int i, ports_size, err;
+	const u8 *ports;
+
+	switch (type) {
+	case smsc47m1:
+	default:
+		ports = ports_m1;
+		ports_size = ARRAY_SIZE(ports_m1);
+		break;
+	case smsc47m2:
+		ports = ports_m2;
+		ports_size = ARRAY_SIZE(ports_m2);
+		break;
+	}
+
+	for (i = 0; i + 1 < ports_size; i += 2) {
+		unsigned short start = address + ports[i];
+		unsigned short len = ports[i + 1];
+
+		switch (action) {
+		case CHECK:
+			/* Only check for conflicts */
+			err = acpi_check_region(start, len, DRVNAME);
+			if (err)
+				return err;
+			break;
+		case REQUEST:
+			/* Request the resources */
+			if (!devm_request_region(dev, start, len, DRVNAME)) {
+				dev_err(dev,
+					"Region 0x%x-0x%x already in use!\n",
+					start, start + len);
+				return -EBUSY;
+			}
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static void smsc47m1_remove_files(struct device *dev)
+{
+	sysfs_remove_group(&dev->kobj, &smsc47m1_group);
+	sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan1);
+	sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan2);
+	sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan3);
+	sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm1);
+	sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm2);
+	sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm3);
+}
+
+static int __init smsc47m1_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct smsc47m1_sio_data *sio_data = dev_get_platdata(dev);
+	struct smsc47m1_data *data;
+	struct resource *res;
+	int err;
+	int fan1, fan2, fan3, pwm1, pwm2, pwm3;
+
+	static const char * const names[] = {
+		"smsc47m1",
+		"smsc47m2",
+	};
+
+	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	err = smsc47m1_handle_resources(res->start, sio_data->type,
+					REQUEST, dev);
+	if (err < 0)
+		return err;
+
+	data = devm_kzalloc(dev, sizeof(struct smsc47m1_data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->addr = res->start;
+	data->type = sio_data->type;
+	data->name = names[sio_data->type];
+	mutex_init(&data->update_lock);
+	platform_set_drvdata(pdev, data);
+
+	/*
+	 * If no function is properly configured, there's no point in
+	 * actually registering the chip.
+	 */
+	pwm1 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(0)) & 0x05)
+	       == 0x04;
+	pwm2 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(1)) & 0x05)
+	       == 0x04;
+	if (data->type == smsc47m2) {
+		fan1 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN1)
+			& 0x0d) == 0x09;
+		fan2 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN2)
+			& 0x0d) == 0x09;
+		fan3 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN3)
+			& 0x0d) == 0x0d;
+		pwm3 = (smsc47m1_read_value(data, SMSC47M2_REG_PPIN3)
+			& 0x0d) == 0x08;
+	} else {
+		fan1 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(0))
+			& 0x05) == 0x05;
+		fan2 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(1))
+			& 0x05) == 0x05;
+		fan3 = 0;
+		pwm3 = 0;
+	}
+	if (!(fan1 || fan2 || fan3 || pwm1 || pwm2 || pwm3)) {
+		dev_warn(dev, "Device not configured, will not use\n");
+		return -ENODEV;
+	}
+
+	/*
+	 * Some values (fan min, clock dividers, pwm registers) may be
+	 * needed before any update is triggered, so we better read them
+	 * at least once here. We don't usually do it that way, but in
+	 * this particular case, manually reading 5 registers out of 8
+	 * doesn't make much sense and we're better using the existing
+	 * function.
+	 */
+	smsc47m1_update_device(dev, 1);
+
+	/* Register sysfs hooks */
+	if (fan1) {
+		err = sysfs_create_group(&dev->kobj,
+					 &smsc47m1_group_fan1);
+		if (err)
+			goto error_remove_files;
+	} else
+		dev_dbg(dev, "Fan 1 not enabled by hardware, skipping\n");
+
+	if (fan2) {
+		err = sysfs_create_group(&dev->kobj,
+					 &smsc47m1_group_fan2);
+		if (err)
+			goto error_remove_files;
+	} else
+		dev_dbg(dev, "Fan 2 not enabled by hardware, skipping\n");
+
+	if (fan3) {
+		err = sysfs_create_group(&dev->kobj,
+					 &smsc47m1_group_fan3);
+		if (err)
+			goto error_remove_files;
+	} else if (data->type == smsc47m2)
+		dev_dbg(dev, "Fan 3 not enabled by hardware, skipping\n");
+
+	if (pwm1) {
+		err = sysfs_create_group(&dev->kobj,
+					 &smsc47m1_group_pwm1);
+		if (err)
+			goto error_remove_files;
+	} else
+		dev_dbg(dev, "PWM 1 not enabled by hardware, skipping\n");
+
+	if (pwm2) {
+		err = sysfs_create_group(&dev->kobj,
+					 &smsc47m1_group_pwm2);
+		if (err)
+			goto error_remove_files;
+	} else
+		dev_dbg(dev, "PWM 2 not enabled by hardware, skipping\n");
+
+	if (pwm3) {
+		err = sysfs_create_group(&dev->kobj,
+					 &smsc47m1_group_pwm3);
+		if (err)
+			goto error_remove_files;
+	} else if (data->type == smsc47m2)
+		dev_dbg(dev, "PWM 3 not enabled by hardware, skipping\n");
+
+	err = sysfs_create_group(&dev->kobj, &smsc47m1_group);
+	if (err)
+		goto error_remove_files;
+
+	data->hwmon_dev = hwmon_device_register(dev);
+	if (IS_ERR(data->hwmon_dev)) {
+		err = PTR_ERR(data->hwmon_dev);
+		goto error_remove_files;
+	}
+
+	return 0;
+
+error_remove_files:
+	smsc47m1_remove_files(dev);
+	return err;
+}
+
+static int __exit smsc47m1_remove(struct platform_device *pdev)
+{
+	struct smsc47m1_data *data = platform_get_drvdata(pdev);
+
+	hwmon_device_unregister(data->hwmon_dev);
+	smsc47m1_remove_files(&pdev->dev);
+
+	return 0;
+}
+
+static struct platform_driver smsc47m1_driver = {
+	.driver = {
+		.name	= DRVNAME,
+	},
+	.remove		= __exit_p(smsc47m1_remove),
+};
+
+static int __init smsc47m1_device_add(unsigned short address,
+				      const struct smsc47m1_sio_data *sio_data)
+{
+	struct resource res = {
+		.start	= address,
+		.end	= address + SMSC_EXTENT - 1,
+		.name	= DRVNAME,
+		.flags	= IORESOURCE_IO,
+	};
+	int err;
+
+	err = smsc47m1_handle_resources(address, sio_data->type, CHECK, NULL);
+	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_data(pdev, sio_data,
+				       sizeof(struct smsc47m1_sio_data));
+	if (err) {
+		pr_err("Platform data allocation failed\n");
+		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 sm_smsc47m1_init(void)
+{
+	int err;
+	unsigned short address;
+	struct smsc47m1_sio_data sio_data;
+
+	err = smsc47m1_find(&sio_data);
+	if (err < 0)
+		return err;
+	address = err;
+
+	/* Sets global pdev as a side effect */
+	err = smsc47m1_device_add(address, &sio_data);
+	if (err)
+		return err;
+
+	err = platform_driver_probe(&smsc47m1_driver, smsc47m1_probe);
+	if (err)
+		goto exit_device;
+
+	return 0;
+
+exit_device:
+	platform_device_unregister(pdev);
+	smsc47m1_restore(&sio_data);
+	return err;
+}
+
+static void __exit sm_smsc47m1_exit(void)
+{
+	platform_driver_unregister(&smsc47m1_driver);
+	smsc47m1_restore(dev_get_platdata(&pdev->dev));
+	platform_device_unregister(pdev);
+}
+
+MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>");
+MODULE_DESCRIPTION("SMSC LPC47M1xx fan sensors driver");
+MODULE_LICENSE("GPL");
+
+module_init(sm_smsc47m1_init);
+module_exit(sm_smsc47m1_exit);