Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 833 insertions, 0 deletions

diff --git a/drivers/hwmon/adm9240.c b/drivers/hwmon/adm9240.c
new file mode 100644
index 000000000..40e3558d3
--- /dev/null
+++ b/drivers/hwmon/adm9240.c
@@ -0,0 +1,833 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * adm9240.c	Part of lm_sensors, Linux kernel modules for hardware
+ *		monitoring
+ *
+ * Copyright (C) 1999	Frodo Looijaard <frodol@dds.nl>
+ *			Philip Edelbrock <phil@netroedge.com>
+ * Copyright (C) 2003	Michiel Rook <michiel@grendelproject.nl>
+ * Copyright (C) 2005	Grant Coady <gcoady.lk@gmail.com> with valuable
+ *				guidance from Jean Delvare
+ *
+ * Driver supports	Analog Devices		ADM9240
+ *			Dallas Semiconductor	DS1780
+ *			National Semiconductor	LM81
+ *
+ * ADM9240 is the reference, DS1780 and LM81 are register compatibles
+ *
+ * Voltage	Six inputs are scaled by chip, VID also reported
+ * Temperature	Chip temperature to 0.5'C, maximum and max_hysteris
+ * Fans		2 fans, low speed alarm, automatic fan clock divider
+ * Alarms	16-bit map of active alarms
+ * Analog Out	0..1250 mV output
+ *
+ * Chassis Intrusion: clear CI latch with 'echo 0 > intrusion0_alarm'
+ *
+ * Test hardware: Intel SE440BX-2 desktop motherboard --Grant
+ *
+ * LM81 extended temp reading not implemented
+ */
+
+#include <linux/bits.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-vid.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+
+/* Addresses to scan */
+static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
+					I2C_CLIENT_END };
+
+enum chips { adm9240, ds1780, lm81 };
+
+/* ADM9240 registers */
+#define ADM9240_REG_MAN_ID		0x3e
+#define ADM9240_REG_DIE_REV		0x3f
+#define ADM9240_REG_CONFIG		0x40
+
+#define ADM9240_REG_IN(nr)		(0x20 + (nr))   /* 0..5 */
+#define ADM9240_REG_IN_MAX(nr)		(0x2b + (nr) * 2)
+#define ADM9240_REG_IN_MIN(nr)		(0x2c + (nr) * 2)
+#define ADM9240_REG_FAN(nr)		(0x28 + (nr))   /* 0..1 */
+#define ADM9240_REG_FAN_MIN(nr)		(0x3b + (nr))
+#define ADM9240_REG_INT(nr)		(0x41 + (nr))
+#define ADM9240_REG_INT_MASK(nr)	(0x43 + (nr))
+#define ADM9240_REG_TEMP		0x27
+#define ADM9240_REG_TEMP_MAX(nr)	(0x39 + (nr)) /* 0, 1 = high, hyst */
+#define ADM9240_REG_ANALOG_OUT		0x19
+#define ADM9240_REG_CHASSIS_CLEAR	0x46
+#define ADM9240_REG_VID_FAN_DIV		0x47
+#define ADM9240_REG_I2C_ADDR		0x48
+#define ADM9240_REG_VID4		0x49
+#define ADM9240_REG_TEMP_CONF		0x4b
+
+/* generalised scaling with integer rounding */
+static inline int SCALE(long val, int mul, int div)
+{
+	if (val < 0)
+		return (val * mul - div / 2) / div;
+	else
+		return (val * mul + div / 2) / div;
+}
+
+/* adm9240 internally scales voltage measurements */
+static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
+
+static inline unsigned int IN_FROM_REG(u8 reg, int n)
+{
+	return SCALE(reg, nom_mv[n], 192);
+}
+
+static inline u8 IN_TO_REG(unsigned long val, int n)
+{
+	val = clamp_val(val, 0, nom_mv[n] * 255 / 192);
+	return SCALE(val, 192, nom_mv[n]);
+}
+
+/* temperature range: -40..125, 127 disables temperature alarm */
+static inline s8 TEMP_TO_REG(long val)
+{
+	val = clamp_val(val, -40000, 127000);
+	return SCALE(val, 1, 1000);
+}
+
+/* two fans, each with low fan speed limit */
+static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
+{
+	if (!reg) /* error */
+		return -1;
+
+	if (reg == 255)
+		return 0;
+
+	return SCALE(1350000, 1, reg * div);
+}
+
+/* analog out 0..1250mV */
+static inline u8 AOUT_TO_REG(unsigned long val)
+{
+	val = clamp_val(val, 0, 1250);
+	return SCALE(val, 255, 1250);
+}
+
+static inline unsigned int AOUT_FROM_REG(u8 reg)
+{
+	return SCALE(reg, 1250, 255);
+}
+
+/* per client data */
+struct adm9240_data {
+	struct device *dev;
+	struct regmap *regmap;
+	struct mutex update_lock;
+
+	u8 fan_div[2];		/* rw	fan1_div, read-only accessor */
+	u8 vrm;			/* --	vrm set on startup, no accessor */
+};
+
+/* write new fan div, callers must hold data->update_lock */
+static int adm9240_write_fan_div(struct adm9240_data *data, int channel, u8 fan_div)
+{
+	unsigned int reg, old, shift = (channel + 2) * 2;
+	int err;
+
+	err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, &reg);
+	if (err < 0)
+		return err;
+	old = (reg >> shift) & 3;
+	reg &= ~(3 << shift);
+	reg |= (fan_div << shift);
+	err = regmap_write(data->regmap, ADM9240_REG_VID_FAN_DIV, reg);
+	if (err < 0)
+		return err;
+	dev_dbg(data->dev,
+		"fan%d clock divider changed from %lu to %lu\n",
+		channel + 1, BIT(old), BIT(fan_div));
+
+	return 0;
+}
+
+/*
+ * set fan speed low limit:
+ *
+ * - value is zero: disable fan speed low limit alarm
+ *
+ * - value is below fan speed measurement range: enable fan speed low
+ *   limit alarm to be asserted while fan speed too slow to measure
+ *
+ * - otherwise: select fan clock divider to suit fan speed low limit,
+ *   measurement code may adjust registers to ensure fan speed reading
+ */
+static int adm9240_fan_min_write(struct adm9240_data *data, int channel, long val)
+{
+	u8 new_div;
+	u8 fan_min;
+	int err;
+
+	mutex_lock(&data->update_lock);
+
+	if (!val) {
+		fan_min = 255;
+		new_div = data->fan_div[channel];
+
+		dev_dbg(data->dev, "fan%u low limit set disabled\n", channel + 1);
+	} else if (val < 1350000 / (8 * 254)) {
+		new_div = 3;
+		fan_min = 254;
+
+		dev_dbg(data->dev, "fan%u low limit set minimum %u\n",
+			channel + 1, FAN_FROM_REG(254, BIT(new_div)));
+	} else {
+		unsigned int new_min = 1350000 / val;
+
+		new_div = 0;
+		while (new_min > 192 && new_div < 3) {
+			new_div++;
+			new_min /= 2;
+		}
+		if (!new_min) /* keep > 0 */
+			new_min++;
+
+		fan_min = new_min;
+
+		dev_dbg(data->dev, "fan%u low limit set fan speed %u\n",
+			channel + 1, FAN_FROM_REG(new_min, BIT(new_div)));
+	}
+
+	if (new_div != data->fan_div[channel]) {
+		data->fan_div[channel] = new_div;
+		adm9240_write_fan_div(data, channel, new_div);
+	}
+	err = regmap_write(data->regmap, ADM9240_REG_FAN_MIN(channel), fan_min);
+
+	mutex_unlock(&data->update_lock);
+
+	return err;
+}
+
+static ssize_t cpu0_vid_show(struct device *dev,
+			     struct device_attribute *attr, char *buf)
+{
+	struct adm9240_data *data = dev_get_drvdata(dev);
+	unsigned int regval;
+	int err;
+	u8 vid;
+
+	err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, &regval);
+	if (err < 0)
+		return err;
+	vid = regval & 0x0f;
+	err = regmap_read(data->regmap, ADM9240_REG_VID4, &regval);
+	if (err < 0)
+		return err;
+	vid |= (regval & 1) << 4;
+	return sprintf(buf, "%d\n", vid_from_reg(vid, data->vrm));
+}
+static DEVICE_ATTR_RO(cpu0_vid);
+
+static ssize_t aout_output_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct adm9240_data *data = dev_get_drvdata(dev);
+	unsigned int regval;
+	int err;
+
+	err = regmap_read(data->regmap, ADM9240_REG_ANALOG_OUT, &regval);
+	if (err)
+		return err;
+
+	return sprintf(buf, "%d\n", AOUT_FROM_REG(regval));
+}
+
+static ssize_t aout_output_store(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *buf, size_t count)
+{
+	struct adm9240_data *data = dev_get_drvdata(dev);
+	long val;
+	int err;
+
+	err = kstrtol(buf, 10, &val);
+	if (err)
+		return err;
+
+	err = regmap_write(data->regmap, ADM9240_REG_ANALOG_OUT, AOUT_TO_REG(val));
+	return err < 0 ? err : count;
+}
+static DEVICE_ATTR_RW(aout_output);
+
+static struct attribute *adm9240_attrs[] = {
+	&dev_attr_aout_output.attr,
+	&dev_attr_cpu0_vid.attr,
+	NULL
+};
+
+ATTRIBUTE_GROUPS(adm9240);
+
+/*** sensor chip detect and driver install ***/
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int adm9240_detect(struct i2c_client *new_client,
+			  struct i2c_board_info *info)
+{
+	struct i2c_adapter *adapter = new_client->adapter;
+	const char *name = "";
+	int address = new_client->addr;
+	u8 man_id, die_rev;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		return -ENODEV;
+
+	/* verify chip: reg address should match i2c address */
+	if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR) != address)
+		return -ENODEV;
+
+	/* check known chip manufacturer */
+	man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID);
+	if (man_id == 0x23)
+		name = "adm9240";
+	else if (man_id == 0xda)
+		name = "ds1780";
+	else if (man_id == 0x01)
+		name = "lm81";
+	else
+		return -ENODEV;
+
+	/* successful detect, print chip info */
+	die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV);
+	dev_info(&adapter->dev, "found %s revision %u\n",
+		 man_id == 0x23 ? "ADM9240" :
+		 man_id == 0xda ? "DS1780" : "LM81", die_rev);
+
+	strscpy(info->type, name, I2C_NAME_SIZE);
+
+	return 0;
+}
+
+static int adm9240_init_client(struct adm9240_data *data)
+{
+	unsigned int regval;
+	u8 conf, mode;
+	int err;
+
+	err = regmap_raw_read(data->regmap, ADM9240_REG_CONFIG, &conf, 1);
+	if (err < 0)
+		return err;
+	err = regmap_raw_read(data->regmap, ADM9240_REG_TEMP_CONF, &mode, 1);
+	if (err < 0)
+		return err;
+	mode &= 3;
+
+	data->vrm = vid_which_vrm(); /* need this to report vid as mV */
+
+	dev_info(data->dev, "Using VRM: %d.%d\n", data->vrm / 10,
+		 data->vrm % 10);
+
+	if (conf & 1) { /* measurement cycle running: report state */
+
+		dev_info(data->dev, "status: config 0x%02x mode %u\n",
+			 conf, mode);
+
+	} else { /* cold start: open limits before starting chip */
+		int i;
+
+		for (i = 0; i < 6; i++) {
+			err = regmap_write(data->regmap,
+					   ADM9240_REG_IN_MIN(i), 0);
+			if (err < 0)
+				return err;
+			err = regmap_write(data->regmap,
+					   ADM9240_REG_IN_MAX(i), 255);
+			if (err < 0)
+				return err;
+		}
+		for (i = 0; i < 2; i++) {
+			err = regmap_write(data->regmap,
+					   ADM9240_REG_FAN_MIN(i), 255);
+			if (err < 0)
+				return err;
+		}
+		for (i = 0; i < 2; i++) {
+			err = regmap_write(data->regmap,
+					   ADM9240_REG_TEMP_MAX(i), 127);
+			if (err < 0)
+				return err;
+		}
+
+		/* start measurement cycle */
+		err = regmap_write(data->regmap, ADM9240_REG_CONFIG, 1);
+		if (err < 0)
+			return err;
+
+		dev_info(data->dev,
+			 "cold start: config was 0x%02x mode %u\n", conf, mode);
+	}
+
+	/* read fan divs */
+	err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, &regval);
+	if (err < 0)
+		return err;
+	data->fan_div[0] = (regval >> 4) & 3;
+	data->fan_div[1] = (regval >> 6) & 3;
+	return 0;
+}
+
+static int adm9240_chip_read(struct device *dev, u32 attr, long *val)
+{
+	struct adm9240_data *data = dev_get_drvdata(dev);
+	u8 regs[2];
+	int err;
+
+	switch (attr) {
+	case hwmon_chip_alarms:
+		err = regmap_bulk_read(data->regmap, ADM9240_REG_INT(0), &regs, 2);
+		if (err < 0)
+			return err;
+		*val = regs[0] | regs[1] << 8;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+	return 0;
+}
+
+static int adm9240_intrusion_read(struct device *dev, u32 attr, long *val)
+{
+	struct adm9240_data *data = dev_get_drvdata(dev);
+	unsigned int regval;
+	int err;
+
+	switch (attr) {
+	case hwmon_intrusion_alarm:
+		err = regmap_read(data->regmap, ADM9240_REG_INT(1), &regval);
+		if (err < 0)
+			return err;
+		*val = !!(regval & BIT(4));
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+	return 0;
+}
+
+static int adm9240_intrusion_write(struct device *dev, u32 attr, long val)
+{
+	struct adm9240_data *data = dev_get_drvdata(dev);
+	int err;
+
+	switch (attr) {
+	case hwmon_intrusion_alarm:
+		if (val)
+			return -EINVAL;
+		err = regmap_write(data->regmap, ADM9240_REG_CHASSIS_CLEAR, 0x80);
+		if (err < 0)
+			return err;
+		dev_dbg(data->dev, "chassis intrusion latch cleared\n");
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+	return 0;
+}
+
+static int adm9240_in_read(struct device *dev, u32 attr, int channel, long *val)
+{
+	struct adm9240_data *data = dev_get_drvdata(dev);
+	unsigned int regval;
+	int reg;
+	int err;
+
+	switch (attr) {
+	case hwmon_in_input:
+		reg = ADM9240_REG_IN(channel);
+		break;
+	case hwmon_in_min:
+		reg = ADM9240_REG_IN_MIN(channel);
+		break;
+	case hwmon_in_max:
+		reg = ADM9240_REG_IN_MAX(channel);
+		break;
+	case hwmon_in_alarm:
+		if (channel < 4) {
+			reg = ADM9240_REG_INT(0);
+		} else {
+			reg = ADM9240_REG_INT(1);
+			channel -= 4;
+		}
+		err = regmap_read(data->regmap, reg, &regval);
+		if (err < 0)
+			return err;
+		*val = !!(regval & BIT(channel));
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+	err = regmap_read(data->regmap, reg, &regval);
+	if (err < 0)
+		return err;
+	*val = IN_FROM_REG(regval, channel);
+	return 0;
+}
+
+static int adm9240_in_write(struct device *dev, u32 attr, int channel, long val)
+{
+	struct adm9240_data *data = dev_get_drvdata(dev);
+	int reg;
+
+	switch (attr) {
+	case hwmon_in_min:
+		reg = ADM9240_REG_IN_MIN(channel);
+		break;
+	case hwmon_in_max:
+		reg = ADM9240_REG_IN_MAX(channel);
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+	return regmap_write(data->regmap, reg, IN_TO_REG(val, channel));
+}
+
+static int adm9240_fan_read(struct device *dev, u32 attr, int channel, long *val)
+{
+	struct adm9240_data *data = dev_get_drvdata(dev);
+	unsigned int regval;
+	int err;
+
+	switch (attr) {
+	case hwmon_fan_input:
+		mutex_lock(&data->update_lock);
+		err = regmap_read(data->regmap, ADM9240_REG_FAN(channel), &regval);
+		if (err < 0) {
+			mutex_unlock(&data->update_lock);
+			return err;
+		}
+		if (regval == 255 && data->fan_div[channel] < 3) {
+			/* adjust fan clock divider on overflow */
+			err = adm9240_write_fan_div(data, channel,
+						    ++data->fan_div[channel]);
+			if (err) {
+				mutex_unlock(&data->update_lock);
+				return err;
+			}
+		}
+		*val = FAN_FROM_REG(regval, BIT(data->fan_div[channel]));
+		mutex_unlock(&data->update_lock);
+		break;
+	case hwmon_fan_div:
+		*val = BIT(data->fan_div[channel]);
+		break;
+	case hwmon_fan_min:
+		err = regmap_read(data->regmap, ADM9240_REG_FAN_MIN(channel), &regval);
+		if (err < 0)
+			return err;
+		*val = FAN_FROM_REG(regval, BIT(data->fan_div[channel]));
+		break;
+	case hwmon_fan_alarm:
+		err = regmap_read(data->regmap, ADM9240_REG_INT(0), &regval);
+		if (err < 0)
+			return err;
+		*val = !!(regval & BIT(channel + 6));
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+	return 0;
+}
+
+static int adm9240_fan_write(struct device *dev, u32 attr, int channel, long val)
+{
+	struct adm9240_data *data = dev_get_drvdata(dev);
+	int err;
+
+	switch (attr) {
+	case hwmon_fan_min:
+		err = adm9240_fan_min_write(data, channel, val);
+		if (err < 0)
+			return err;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+	return 0;
+}
+
+static int adm9240_temp_read(struct device *dev, u32 attr, int channel, long *val)
+{
+	struct adm9240_data *data = dev_get_drvdata(dev);
+	unsigned int regval;
+	int err, temp;
+
+	switch (attr) {
+	case hwmon_temp_input:
+		err = regmap_read(data->regmap, ADM9240_REG_TEMP, &regval);
+		if (err < 0)
+			return err;
+		temp = regval << 1;
+		err = regmap_read(data->regmap, ADM9240_REG_TEMP_CONF, &regval);
+		if (err < 0)
+			return err;
+		temp |= regval >> 7;
+		*val = sign_extend32(temp, 8) * 500;
+		break;
+	case hwmon_temp_max:
+		err = regmap_read(data->regmap, ADM9240_REG_TEMP_MAX(0), &regval);
+		if (err < 0)
+			return err;
+		*val = (s8)regval * 1000;
+		break;
+	case hwmon_temp_max_hyst:
+		err = regmap_read(data->regmap, ADM9240_REG_TEMP_MAX(1), &regval);
+		if (err < 0)
+			return err;
+		*val = (s8)regval * 1000;
+		break;
+	case hwmon_temp_alarm:
+		err = regmap_read(data->regmap, ADM9240_REG_INT(0), &regval);
+		if (err < 0)
+			return err;
+		*val = !!(regval & BIT(4));
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+	return 0;
+}
+
+static int adm9240_temp_write(struct device *dev, u32 attr, int channel, long val)
+{
+	struct adm9240_data *data = dev_get_drvdata(dev);
+	int reg;
+
+	switch (attr) {
+	case hwmon_temp_max:
+		reg = ADM9240_REG_TEMP_MAX(0);
+		break;
+	case hwmon_temp_max_hyst:
+		reg = ADM9240_REG_TEMP_MAX(1);
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+	return regmap_write(data->regmap, reg, TEMP_TO_REG(val));
+}
+
+static int adm9240_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
+			int channel, long *val)
+{
+	switch (type) {
+	case hwmon_chip:
+		return adm9240_chip_read(dev, attr, val);
+	case hwmon_intrusion:
+		return adm9240_intrusion_read(dev, attr, val);
+	case hwmon_in:
+		return adm9240_in_read(dev, attr, channel, val);
+	case hwmon_fan:
+		return adm9240_fan_read(dev, attr, channel, val);
+	case hwmon_temp:
+		return adm9240_temp_read(dev, attr, channel, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int adm9240_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
+			 int channel, long val)
+{
+	switch (type) {
+	case hwmon_intrusion:
+		return adm9240_intrusion_write(dev, attr, val);
+	case hwmon_in:
+		return adm9240_in_write(dev, attr, channel, val);
+	case hwmon_fan:
+		return adm9240_fan_write(dev, attr, channel, val);
+	case hwmon_temp:
+		return adm9240_temp_write(dev, attr, channel, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static umode_t adm9240_is_visible(const void *_data, enum hwmon_sensor_types type,
+				  u32 attr, int channel)
+{
+	umode_t mode = 0;
+
+	switch (type) {
+	case hwmon_chip:
+		switch (attr) {
+		case hwmon_chip_alarms:
+			mode = 0444;
+			break;
+		default:
+			break;
+		}
+		break;
+	case hwmon_intrusion:
+		switch (attr) {
+		case hwmon_intrusion_alarm:
+			mode = 0644;
+			break;
+		default:
+			break;
+		}
+		break;
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp:
+		case hwmon_temp_alarm:
+			mode = 0444;
+			break;
+		case hwmon_temp_max:
+		case hwmon_temp_max_hyst:
+			mode = 0644;
+			break;
+		default:
+			break;
+		}
+		break;
+	case hwmon_fan:
+		switch (attr) {
+		case hwmon_fan_input:
+		case hwmon_fan_div:
+		case hwmon_fan_alarm:
+			mode = 0444;
+			break;
+		case hwmon_fan_min:
+			mode = 0644;
+			break;
+		default:
+			break;
+		}
+		break;
+	case hwmon_in:
+		switch (attr) {
+		case hwmon_in_input:
+		case hwmon_in_alarm:
+			mode = 0444;
+			break;
+		case hwmon_in_min:
+		case hwmon_in_max:
+			mode = 0644;
+			break;
+		default:
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+	return mode;
+}
+
+static const struct hwmon_ops adm9240_hwmon_ops = {
+	.is_visible = adm9240_is_visible,
+	.read = adm9240_read,
+	.write = adm9240_write,
+};
+
+static const struct hwmon_channel_info *adm9240_info[] = {
+	HWMON_CHANNEL_INFO(chip, HWMON_C_ALARMS),
+	HWMON_CHANNEL_INFO(intrusion, HWMON_INTRUSION_ALARM),
+	HWMON_CHANNEL_INFO(temp,
+			   HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_ALARM),
+	HWMON_CHANNEL_INFO(in,
+			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
+			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
+			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
+			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
+			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
+			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM),
+	HWMON_CHANNEL_INFO(fan,
+			   HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_DIV | HWMON_F_ALARM,
+			   HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_DIV | HWMON_F_ALARM),
+	NULL
+};
+
+static const struct hwmon_chip_info adm9240_chip_info = {
+	.ops = &adm9240_hwmon_ops,
+	.info = adm9240_info,
+};
+
+static bool adm9240_volatile_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case ADM9240_REG_IN(0) ... ADM9240_REG_IN(5):
+	case ADM9240_REG_FAN(0) ... ADM9240_REG_FAN(1):
+	case ADM9240_REG_INT(0) ... ADM9240_REG_INT(1):
+	case ADM9240_REG_TEMP:
+	case ADM9240_REG_TEMP_CONF:
+	case ADM9240_REG_VID_FAN_DIV:
+	case ADM9240_REG_VID4:
+	case ADM9240_REG_ANALOG_OUT:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static const struct regmap_config adm9240_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.use_single_read = true,
+	.use_single_write = true,
+	.volatile_reg = adm9240_volatile_reg,
+};
+
+static int adm9240_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct device *hwmon_dev;
+	struct adm9240_data *data;
+	int err;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->dev = dev;
+	mutex_init(&data->update_lock);
+	data->regmap = devm_regmap_init_i2c(client, &adm9240_regmap_config);
+	if (IS_ERR(data->regmap))
+		return PTR_ERR(data->regmap);
+
+	err = adm9240_init_client(data);
+	if (err < 0)
+		return err;
+
+	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data,
+							 &adm9240_chip_info,
+							 adm9240_groups);
+	return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct i2c_device_id adm9240_id[] = {
+	{ "adm9240", adm9240 },
+	{ "ds1780", ds1780 },
+	{ "lm81", lm81 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, adm9240_id);
+
+static struct i2c_driver adm9240_driver = {
+	.class		= I2C_CLASS_HWMON,
+	.driver = {
+		.name	= "adm9240",
+	},
+	.probe_new	= adm9240_probe,
+	.id_table	= adm9240_id,
+	.detect		= adm9240_detect,
+	.address_list	= normal_i2c,
+};
+
+module_i2c_driver(adm9240_driver);
+
+MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
+		"Grant Coady <gcoady.lk@gmail.com> and others");
+MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
+MODULE_LICENSE("GPL");