Adding upstream version 5.10.209.upstream/5.10.209upstream

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

1 files changed, 1010 insertions, 0 deletions

diff --git a/drivers/hwmon/asb100.c b/drivers/hwmon/asb100.c
new file mode 100644
index 000000000..ba9fcf6f9
--- /dev/null
+++ b/drivers/hwmon/asb100.c
@@ -0,0 +1,1010 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * asb100.c - Part of lm_sensors, Linux kernel modules for hardware
+ *	      monitoring
+ *
+ * Copyright (C) 2004 Mark M. Hoffman <mhoffman@lightlink.com>
+ *
+ * (derived from w83781d.c)
+ *
+ * Copyright (C) 1998 - 2003  Frodo Looijaard <frodol@dds.nl>,
+ *			      Philip Edelbrock <phil@netroedge.com>, and
+ *			      Mark Studebaker <mdsxyz123@yahoo.com>
+ */
+
+/*
+ * This driver supports the hardware sensor chips: Asus ASB100 and
+ * ASB100-A "BACH".
+ *
+ * ASB100-A supports pwm1, while plain ASB100 does not.  There is no known
+ * way for the driver to tell which one is there.
+ *
+ * Chip		#vin	#fanin	#pwm	#temp	wchipid	vendid	i2c	ISA
+ * asb100	7	3	1	4	0x31	0x0694	yes	no
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/hwmon-vid.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/mutex.h>
+#include "lm75.h"
+
+/* I2C addresses to scan */
+static const unsigned short normal_i2c[] = { 0x2d, I2C_CLIENT_END };
+
+static unsigned short force_subclients[4];
+module_param_array(force_subclients, short, NULL, 0);
+MODULE_PARM_DESC(force_subclients,
+	"List of subclient addresses: {bus, clientaddr, subclientaddr1, subclientaddr2}");
+
+/* Voltage IN registers 0-6 */
+#define ASB100_REG_IN(nr)	(0x20 + (nr))
+#define ASB100_REG_IN_MAX(nr)	(0x2b + (nr * 2))
+#define ASB100_REG_IN_MIN(nr)	(0x2c + (nr * 2))
+
+/* FAN IN registers 1-3 */
+#define ASB100_REG_FAN(nr)	(0x28 + (nr))
+#define ASB100_REG_FAN_MIN(nr)	(0x3b + (nr))
+
+/* TEMPERATURE registers 1-4 */
+static const u16 asb100_reg_temp[]	= {0, 0x27, 0x150, 0x250, 0x17};
+static const u16 asb100_reg_temp_max[]	= {0, 0x39, 0x155, 0x255, 0x18};
+static const u16 asb100_reg_temp_hyst[]	= {0, 0x3a, 0x153, 0x253, 0x19};
+
+#define ASB100_REG_TEMP(nr) (asb100_reg_temp[nr])
+#define ASB100_REG_TEMP_MAX(nr) (asb100_reg_temp_max[nr])
+#define ASB100_REG_TEMP_HYST(nr) (asb100_reg_temp_hyst[nr])
+
+#define ASB100_REG_TEMP2_CONFIG	0x0152
+#define ASB100_REG_TEMP3_CONFIG	0x0252
+
+
+#define ASB100_REG_CONFIG	0x40
+#define ASB100_REG_ALARM1	0x41
+#define ASB100_REG_ALARM2	0x42
+#define ASB100_REG_SMIM1	0x43
+#define ASB100_REG_SMIM2	0x44
+#define ASB100_REG_VID_FANDIV	0x47
+#define ASB100_REG_I2C_ADDR	0x48
+#define ASB100_REG_CHIPID	0x49
+#define ASB100_REG_I2C_SUBADDR	0x4a
+#define ASB100_REG_PIN		0x4b
+#define ASB100_REG_IRQ		0x4c
+#define ASB100_REG_BANK		0x4e
+#define ASB100_REG_CHIPMAN	0x4f
+
+#define ASB100_REG_WCHIPID	0x58
+
+/* bit 7 -> enable, bits 0-3 -> duty cycle */
+#define ASB100_REG_PWM1		0x59
+
+/*
+ * CONVERSIONS
+ * Rounding and limit checking is only done on the TO_REG variants.
+ */
+
+/* These constants are a guess, consistent w/ w83781d */
+#define ASB100_IN_MIN		0
+#define ASB100_IN_MAX		4080
+
+/*
+ * IN: 1/1000 V (0V to 4.08V)
+ * REG: 16mV/bit
+ */
+static u8 IN_TO_REG(unsigned val)
+{
+	unsigned nval = clamp_val(val, ASB100_IN_MIN, ASB100_IN_MAX);
+	return (nval + 8) / 16;
+}
+
+static unsigned IN_FROM_REG(u8 reg)
+{
+	return reg * 16;
+}
+
+static u8 FAN_TO_REG(long rpm, int div)
+{
+	if (rpm == -1)
+		return 0;
+	if (rpm == 0)
+		return 255;
+	rpm = clamp_val(rpm, 1, 1000000);
+	return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
+}
+
+static int FAN_FROM_REG(u8 val, int div)
+{
+	return val == 0 ? -1 : val == 255 ? 0 : 1350000 / (val * div);
+}
+
+/* These constants are a guess, consistent w/ w83781d */
+#define ASB100_TEMP_MIN		-128000
+#define ASB100_TEMP_MAX		127000
+
+/*
+ * TEMP: 0.001C/bit (-128C to +127C)
+ * REG: 1C/bit, two's complement
+ */
+static u8 TEMP_TO_REG(long temp)
+{
+	int ntemp = clamp_val(temp, ASB100_TEMP_MIN, ASB100_TEMP_MAX);
+	ntemp += (ntemp < 0 ? -500 : 500);
+	return (u8)(ntemp / 1000);
+}
+
+static int TEMP_FROM_REG(u8 reg)
+{
+	return (s8)reg * 1000;
+}
+
+/*
+ * PWM: 0 - 255 per sensors documentation
+ * REG: (6.25% duty cycle per bit)
+ */
+static u8 ASB100_PWM_TO_REG(int pwm)
+{
+	pwm = clamp_val(pwm, 0, 255);
+	return (u8)(pwm / 16);
+}
+
+static int ASB100_PWM_FROM_REG(u8 reg)
+{
+	return reg * 16;
+}
+
+#define DIV_FROM_REG(val) (1 << (val))
+
+/*
+ * FAN DIV: 1, 2, 4, or 8 (defaults to 2)
+ * REG: 0, 1, 2, or 3 (respectively) (defaults to 1)
+ */
+static u8 DIV_TO_REG(long val)
+{
+	return val == 8 ? 3 : val == 4 ? 2 : val == 1 ? 0 : 1;
+}
+
+/*
+ * For each registered client, we need to keep some data in memory. That
+ * data is pointed to by client->data. The structure itself is
+ * dynamically allocated, at the same time the client itself is allocated.
+ */
+struct asb100_data {
+	struct device *hwmon_dev;
+	struct mutex lock;
+
+	struct mutex update_lock;
+	unsigned long last_updated;	/* In jiffies */
+
+	/* array of 2 pointers to subclients */
+	struct i2c_client *lm75[2];
+
+	char valid;		/* !=0 if following fields are valid */
+	u8 in[7];		/* Register value */
+	u8 in_max[7];		/* Register value */
+	u8 in_min[7];		/* Register value */
+	u8 fan[3];		/* Register value */
+	u8 fan_min[3];		/* Register value */
+	u16 temp[4];		/* Register value (0 and 3 are u8 only) */
+	u16 temp_max[4];	/* Register value (0 and 3 are u8 only) */
+	u16 temp_hyst[4];	/* Register value (0 and 3 are u8 only) */
+	u8 fan_div[3];		/* Register encoding, right justified */
+	u8 pwm;			/* Register encoding */
+	u8 vid;			/* Register encoding, combined */
+	u32 alarms;		/* Register encoding, combined */
+	u8 vrm;
+};
+
+static int asb100_read_value(struct i2c_client *client, u16 reg);
+static void asb100_write_value(struct i2c_client *client, u16 reg, u16 val);
+
+static int asb100_probe(struct i2c_client *client);
+static int asb100_detect(struct i2c_client *client,
+			 struct i2c_board_info *info);
+static int asb100_remove(struct i2c_client *client);
+static struct asb100_data *asb100_update_device(struct device *dev);
+static void asb100_init_client(struct i2c_client *client);
+
+static const struct i2c_device_id asb100_id[] = {
+	{ "asb100", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, asb100_id);
+
+static struct i2c_driver asb100_driver = {
+	.class		= I2C_CLASS_HWMON,
+	.driver = {
+		.name	= "asb100",
+	},
+	.probe_new	= asb100_probe,
+	.remove		= asb100_remove,
+	.id_table	= asb100_id,
+	.detect		= asb100_detect,
+	.address_list	= normal_i2c,
+};
+
+/* 7 Voltages */
+#define show_in_reg(reg) \
+static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
+		char *buf) \
+{ \
+	int nr = to_sensor_dev_attr(attr)->index; \
+	struct asb100_data *data = asb100_update_device(dev); \
+	return sprintf(buf, "%d\n", IN_FROM_REG(data->reg[nr])); \
+}
+
+show_in_reg(in)
+show_in_reg(in_min)
+show_in_reg(in_max)
+
+#define set_in_reg(REG, reg) \
+static ssize_t set_in_##reg(struct device *dev, struct device_attribute *attr, \
+		const char *buf, size_t count) \
+{ \
+	int nr = to_sensor_dev_attr(attr)->index; \
+	struct i2c_client *client = to_i2c_client(dev); \
+	struct asb100_data *data = i2c_get_clientdata(client); \
+	unsigned long val; \
+	int err = kstrtoul(buf, 10, &val); \
+	if (err) \
+		return err; \
+	mutex_lock(&data->update_lock); \
+	data->in_##reg[nr] = IN_TO_REG(val); \
+	asb100_write_value(client, ASB100_REG_IN_##REG(nr), \
+		data->in_##reg[nr]); \
+	mutex_unlock(&data->update_lock); \
+	return count; \
+}
+
+set_in_reg(MIN, min)
+set_in_reg(MAX, max)
+
+#define sysfs_in(offset) \
+static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
+		show_in, NULL, offset); \
+static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
+		show_in_min, set_in_min, offset); \
+static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
+		show_in_max, set_in_max, offset)
+
+sysfs_in(0);
+sysfs_in(1);
+sysfs_in(2);
+sysfs_in(3);
+sysfs_in(4);
+sysfs_in(5);
+sysfs_in(6);
+
+/* 3 Fans */
+static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
+		char *buf)
+{
+	int nr = to_sensor_dev_attr(attr)->index;
+	struct asb100_data *data = asb100_update_device(dev);
+	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
+		DIV_FROM_REG(data->fan_div[nr])));
+}
+
+static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
+		char *buf)
+{
+	int nr = to_sensor_dev_attr(attr)->index;
+	struct asb100_data *data = asb100_update_device(dev);
+	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
+		DIV_FROM_REG(data->fan_div[nr])));
+}
+
+static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
+		char *buf)
+{
+	int nr = to_sensor_dev_attr(attr)->index;
+	struct asb100_data *data = asb100_update_device(dev);
+	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
+}
+
+static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
+		const char *buf, size_t count)
+{
+	int nr = to_sensor_dev_attr(attr)->index;
+	struct i2c_client *client = to_i2c_client(dev);
+	struct asb100_data *data = i2c_get_clientdata(client);
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+
+	mutex_lock(&data->update_lock);
+	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
+	asb100_write_value(client, ASB100_REG_FAN_MIN(nr), data->fan_min[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 divisor.  This follows the principle of
+ * least surprise; the user doesn't expect the fan minimum to change just
+ * because the divisor changed.
+ */
+static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
+		const char *buf, size_t count)
+{
+	int nr = to_sensor_dev_attr(attr)->index;
+	struct i2c_client *client = to_i2c_client(dev);
+	struct asb100_data *data = i2c_get_clientdata(client);
+	unsigned long min;
+	int reg;
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+
+	mutex_lock(&data->update_lock);
+
+	min = FAN_FROM_REG(data->fan_min[nr],
+			DIV_FROM_REG(data->fan_div[nr]));
+	data->fan_div[nr] = DIV_TO_REG(val);
+
+	switch (nr) {
+	case 0:	/* fan 1 */
+		reg = asb100_read_value(client, ASB100_REG_VID_FANDIV);
+		reg = (reg & 0xcf) | (data->fan_div[0] << 4);
+		asb100_write_value(client, ASB100_REG_VID_FANDIV, reg);
+		break;
+
+	case 1:	/* fan 2 */
+		reg = asb100_read_value(client, ASB100_REG_VID_FANDIV);
+		reg = (reg & 0x3f) | (data->fan_div[1] << 6);
+		asb100_write_value(client, ASB100_REG_VID_FANDIV, reg);
+		break;
+
+	case 2:	/* fan 3 */
+		reg = asb100_read_value(client, ASB100_REG_PIN);
+		reg = (reg & 0x3f) | (data->fan_div[2] << 6);
+		asb100_write_value(client, ASB100_REG_PIN, reg);
+		break;
+	}
+
+	data->fan_min[nr] =
+		FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
+	asb100_write_value(client, ASB100_REG_FAN_MIN(nr), data->fan_min[nr]);
+
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+#define sysfs_fan(offset) \
+static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
+		show_fan, NULL, offset - 1); \
+static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
+		show_fan_min, set_fan_min, offset - 1); \
+static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
+		show_fan_div, set_fan_div, offset - 1)
+
+sysfs_fan(1);
+sysfs_fan(2);
+sysfs_fan(3);
+
+/* 4 Temp. Sensors */
+static int sprintf_temp_from_reg(u16 reg, char *buf, int nr)
+{
+	int ret = 0;
+
+	switch (nr) {
+	case 1: case 2:
+		ret = sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(reg));
+		break;
+	case 0: case 3: default:
+		ret = sprintf(buf, "%d\n", TEMP_FROM_REG(reg));
+		break;
+	}
+	return ret;
+}
+
+#define show_temp_reg(reg) \
+static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
+		char *buf) \
+{ \
+	int nr = to_sensor_dev_attr(attr)->index; \
+	struct asb100_data *data = asb100_update_device(dev); \
+	return sprintf_temp_from_reg(data->reg[nr], buf, nr); \
+}
+
+show_temp_reg(temp);
+show_temp_reg(temp_max);
+show_temp_reg(temp_hyst);
+
+#define set_temp_reg(REG, reg) \
+static ssize_t set_##reg(struct device *dev, struct device_attribute *attr, \
+		const char *buf, size_t count) \
+{ \
+	int nr = to_sensor_dev_attr(attr)->index; \
+	struct i2c_client *client = to_i2c_client(dev); \
+	struct asb100_data *data = i2c_get_clientdata(client); \
+	long val; \
+	int err = kstrtol(buf, 10, &val); \
+	if (err) \
+		return err; \
+	mutex_lock(&data->update_lock); \
+	switch (nr) { \
+	case 1: case 2: \
+		data->reg[nr] = LM75_TEMP_TO_REG(val); \
+		break; \
+	case 0: case 3: default: \
+		data->reg[nr] = TEMP_TO_REG(val); \
+		break; \
+	} \
+	asb100_write_value(client, ASB100_REG_TEMP_##REG(nr+1), \
+			data->reg[nr]); \
+	mutex_unlock(&data->update_lock); \
+	return count; \
+}
+
+set_temp_reg(MAX, temp_max);
+set_temp_reg(HYST, temp_hyst);
+
+#define sysfs_temp(num) \
+static SENSOR_DEVICE_ATTR(temp##num##_input, S_IRUGO, \
+		show_temp, NULL, num - 1); \
+static SENSOR_DEVICE_ATTR(temp##num##_max, S_IRUGO | S_IWUSR, \
+		show_temp_max, set_temp_max, num - 1); \
+static SENSOR_DEVICE_ATTR(temp##num##_max_hyst, S_IRUGO | S_IWUSR, \
+		show_temp_hyst, set_temp_hyst, num - 1)
+
+sysfs_temp(1);
+sysfs_temp(2);
+sysfs_temp(3);
+sysfs_temp(4);
+
+/* VID */
+static ssize_t cpu0_vid_show(struct device *dev,
+			     struct device_attribute *attr, char *buf)
+{
+	struct asb100_data *data = asb100_update_device(dev);
+	return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
+}
+
+static DEVICE_ATTR_RO(cpu0_vid);
+
+/* VRM */
+static ssize_t vrm_show(struct device *dev, struct device_attribute *attr,
+		char *buf)
+{
+	struct asb100_data *data = dev_get_drvdata(dev);
+	return sprintf(buf, "%d\n", data->vrm);
+}
+
+static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,
+			 const char *buf, size_t count)
+{
+	struct asb100_data *data = dev_get_drvdata(dev);
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+
+	if (val > 255)
+		return -EINVAL;
+
+	data->vrm = val;
+	return count;
+}
+
+/* Alarms */
+static DEVICE_ATTR_RW(vrm);
+
+static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
+		char *buf)
+{
+	struct asb100_data *data = asb100_update_device(dev);
+	return sprintf(buf, "%u\n", data->alarms);
+}
+
+static DEVICE_ATTR_RO(alarms);
+
+static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
+		char *buf)
+{
+	int bitnr = to_sensor_dev_attr(attr)->index;
+	struct asb100_data *data = asb100_update_device(dev);
+	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
+}
+static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
+static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
+static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
+static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
+static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
+static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
+static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
+static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11);
+static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
+static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 13);
+
+/* 1 PWM */
+static ssize_t pwm1_show(struct device *dev, struct device_attribute *attr,
+		char *buf)
+{
+	struct asb100_data *data = asb100_update_device(dev);
+	return sprintf(buf, "%d\n", ASB100_PWM_FROM_REG(data->pwm & 0x0f));
+}
+
+static ssize_t pwm1_store(struct device *dev, struct device_attribute *attr,
+			  const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct asb100_data *data = i2c_get_clientdata(client);
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+
+	mutex_lock(&data->update_lock);
+	data->pwm &= 0x80; /* keep the enable bit */
+	data->pwm |= (0x0f & ASB100_PWM_TO_REG(val));
+	asb100_write_value(client, ASB100_REG_PWM1, data->pwm);
+	mutex_unlock(&data->update_lock);
+	return count;
+}
+
+static ssize_t pwm1_enable_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct asb100_data *data = asb100_update_device(dev);
+	return sprintf(buf, "%d\n", (data->pwm & 0x80) ? 1 : 0);
+}
+
+static ssize_t pwm1_enable_store(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct asb100_data *data = i2c_get_clientdata(client);
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+
+	mutex_lock(&data->update_lock);
+	data->pwm &= 0x0f; /* keep the duty cycle bits */
+	data->pwm |= (val ? 0x80 : 0x00);
+	asb100_write_value(client, ASB100_REG_PWM1, data->pwm);
+	mutex_unlock(&data->update_lock);
+	return count;
+}
+
+static DEVICE_ATTR_RW(pwm1);
+static DEVICE_ATTR_RW(pwm1_enable);
+
+static struct attribute *asb100_attributes[] = {
+	&sensor_dev_attr_in0_input.dev_attr.attr,
+	&sensor_dev_attr_in0_min.dev_attr.attr,
+	&sensor_dev_attr_in0_max.dev_attr.attr,
+	&sensor_dev_attr_in1_input.dev_attr.attr,
+	&sensor_dev_attr_in1_min.dev_attr.attr,
+	&sensor_dev_attr_in1_max.dev_attr.attr,
+	&sensor_dev_attr_in2_input.dev_attr.attr,
+	&sensor_dev_attr_in2_min.dev_attr.attr,
+	&sensor_dev_attr_in2_max.dev_attr.attr,
+	&sensor_dev_attr_in3_input.dev_attr.attr,
+	&sensor_dev_attr_in3_min.dev_attr.attr,
+	&sensor_dev_attr_in3_max.dev_attr.attr,
+	&sensor_dev_attr_in4_input.dev_attr.attr,
+	&sensor_dev_attr_in4_min.dev_attr.attr,
+	&sensor_dev_attr_in4_max.dev_attr.attr,
+	&sensor_dev_attr_in5_input.dev_attr.attr,
+	&sensor_dev_attr_in5_min.dev_attr.attr,
+	&sensor_dev_attr_in5_max.dev_attr.attr,
+	&sensor_dev_attr_in6_input.dev_attr.attr,
+	&sensor_dev_attr_in6_min.dev_attr.attr,
+	&sensor_dev_attr_in6_max.dev_attr.attr,
+
+	&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_fan2_input.dev_attr.attr,
+	&sensor_dev_attr_fan2_min.dev_attr.attr,
+	&sensor_dev_attr_fan2_div.dev_attr.attr,
+	&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_temp1_input.dev_attr.attr,
+	&sensor_dev_attr_temp1_max.dev_attr.attr,
+	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
+	&sensor_dev_attr_temp2_input.dev_attr.attr,
+	&sensor_dev_attr_temp2_max.dev_attr.attr,
+	&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
+	&sensor_dev_attr_temp3_input.dev_attr.attr,
+	&sensor_dev_attr_temp3_max.dev_attr.attr,
+	&sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
+	&sensor_dev_attr_temp4_input.dev_attr.attr,
+	&sensor_dev_attr_temp4_max.dev_attr.attr,
+	&sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
+
+	&sensor_dev_attr_in0_alarm.dev_attr.attr,
+	&sensor_dev_attr_in1_alarm.dev_attr.attr,
+	&sensor_dev_attr_in2_alarm.dev_attr.attr,
+	&sensor_dev_attr_in3_alarm.dev_attr.attr,
+	&sensor_dev_attr_in4_alarm.dev_attr.attr,
+	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
+	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
+	&sensor_dev_attr_fan3_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp3_alarm.dev_attr.attr,
+
+	&dev_attr_cpu0_vid.attr,
+	&dev_attr_vrm.attr,
+	&dev_attr_alarms.attr,
+	&dev_attr_pwm1.attr,
+	&dev_attr_pwm1_enable.attr,
+
+	NULL
+};
+
+static const struct attribute_group asb100_group = {
+	.attrs = asb100_attributes,
+};
+
+static int asb100_detect_subclients(struct i2c_client *client)
+{
+	int i, id, err;
+	int address = client->addr;
+	unsigned short sc_addr[2];
+	struct asb100_data *data = i2c_get_clientdata(client);
+	struct i2c_adapter *adapter = client->adapter;
+
+	id = i2c_adapter_id(adapter);
+
+	if (force_subclients[0] == id && force_subclients[1] == address) {
+		for (i = 2; i <= 3; i++) {
+			if (force_subclients[i] < 0x48 ||
+			    force_subclients[i] > 0x4f) {
+				dev_err(&client->dev,
+					"invalid subclient address %d; must be 0x48-0x4f\n",
+					force_subclients[i]);
+				err = -ENODEV;
+				goto ERROR_SC_2;
+			}
+		}
+		asb100_write_value(client, ASB100_REG_I2C_SUBADDR,
+					(force_subclients[2] & 0x07) |
+					((force_subclients[3] & 0x07) << 4));
+		sc_addr[0] = force_subclients[2];
+		sc_addr[1] = force_subclients[3];
+	} else {
+		int val = asb100_read_value(client, ASB100_REG_I2C_SUBADDR);
+		sc_addr[0] = 0x48 + (val & 0x07);
+		sc_addr[1] = 0x48 + ((val >> 4) & 0x07);
+	}
+
+	if (sc_addr[0] == sc_addr[1]) {
+		dev_err(&client->dev,
+			"duplicate addresses 0x%x for subclients\n",
+			sc_addr[0]);
+		err = -ENODEV;
+		goto ERROR_SC_2;
+	}
+
+	data->lm75[0] = i2c_new_dummy_device(adapter, sc_addr[0]);
+	if (IS_ERR(data->lm75[0])) {
+		dev_err(&client->dev,
+			"subclient %d registration at address 0x%x failed.\n",
+			1, sc_addr[0]);
+		err = PTR_ERR(data->lm75[0]);
+		goto ERROR_SC_2;
+	}
+
+	data->lm75[1] = i2c_new_dummy_device(adapter, sc_addr[1]);
+	if (IS_ERR(data->lm75[1])) {
+		dev_err(&client->dev,
+			"subclient %d registration at address 0x%x failed.\n",
+			2, sc_addr[1]);
+		err = PTR_ERR(data->lm75[1]);
+		goto ERROR_SC_3;
+	}
+
+	return 0;
+
+/* Undo inits in case of errors */
+ERROR_SC_3:
+	i2c_unregister_device(data->lm75[0]);
+ERROR_SC_2:
+	return err;
+}
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int asb100_detect(struct i2c_client *client,
+			 struct i2c_board_info *info)
+{
+	struct i2c_adapter *adapter = client->adapter;
+	int val1, val2;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
+		pr_debug("detect failed, smbus byte data not supported!\n");
+		return -ENODEV;
+	}
+
+	val1 = i2c_smbus_read_byte_data(client, ASB100_REG_BANK);
+	val2 = i2c_smbus_read_byte_data(client, ASB100_REG_CHIPMAN);
+
+	/* If we're in bank 0 */
+	if ((!(val1 & 0x07)) &&
+			/* Check for ASB100 ID (low byte) */
+			(((!(val1 & 0x80)) && (val2 != 0x94)) ||
+			/* Check for ASB100 ID (high byte ) */
+			((val1 & 0x80) && (val2 != 0x06)))) {
+		pr_debug("detect failed, bad chip id 0x%02x!\n", val2);
+		return -ENODEV;
+	}
+
+	/* Put it now into bank 0 and Vendor ID High Byte */
+	i2c_smbus_write_byte_data(client, ASB100_REG_BANK,
+		(i2c_smbus_read_byte_data(client, ASB100_REG_BANK) & 0x78)
+		| 0x80);
+
+	/* Determine the chip type. */
+	val1 = i2c_smbus_read_byte_data(client, ASB100_REG_WCHIPID);
+	val2 = i2c_smbus_read_byte_data(client, ASB100_REG_CHIPMAN);
+
+	if (val1 != 0x31 || val2 != 0x06)
+		return -ENODEV;
+
+	strlcpy(info->type, "asb100", I2C_NAME_SIZE);
+
+	return 0;
+}
+
+static int asb100_probe(struct i2c_client *client)
+{
+	int err;
+	struct asb100_data *data;
+
+	data = devm_kzalloc(&client->dev, sizeof(struct asb100_data),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, data);
+	mutex_init(&data->lock);
+	mutex_init(&data->update_lock);
+
+	/* Attach secondary lm75 clients */
+	err = asb100_detect_subclients(client);
+	if (err)
+		return err;
+
+	/* Initialize the chip */
+	asb100_init_client(client);
+
+	/* A few vars need to be filled upon startup */
+	data->fan_min[0] = asb100_read_value(client, ASB100_REG_FAN_MIN(0));
+	data->fan_min[1] = asb100_read_value(client, ASB100_REG_FAN_MIN(1));
+	data->fan_min[2] = asb100_read_value(client, ASB100_REG_FAN_MIN(2));
+
+	/* Register sysfs hooks */
+	err = sysfs_create_group(&client->dev.kobj, &asb100_group);
+	if (err)
+		goto ERROR3;
+
+	data->hwmon_dev = hwmon_device_register(&client->dev);
+	if (IS_ERR(data->hwmon_dev)) {
+		err = PTR_ERR(data->hwmon_dev);
+		goto ERROR4;
+	}
+
+	return 0;
+
+ERROR4:
+	sysfs_remove_group(&client->dev.kobj, &asb100_group);
+ERROR3:
+	i2c_unregister_device(data->lm75[1]);
+	i2c_unregister_device(data->lm75[0]);
+	return err;
+}
+
+static int asb100_remove(struct i2c_client *client)
+{
+	struct asb100_data *data = i2c_get_clientdata(client);
+
+	hwmon_device_unregister(data->hwmon_dev);
+	sysfs_remove_group(&client->dev.kobj, &asb100_group);
+
+	i2c_unregister_device(data->lm75[1]);
+	i2c_unregister_device(data->lm75[0]);
+
+	return 0;
+}
+
+/*
+ * The SMBus locks itself, usually, but nothing may access the chip between
+ * bank switches.
+ */
+static int asb100_read_value(struct i2c_client *client, u16 reg)
+{
+	struct asb100_data *data = i2c_get_clientdata(client);
+	struct i2c_client *cl;
+	int res, bank;
+
+	mutex_lock(&data->lock);
+
+	bank = (reg >> 8) & 0x0f;
+	if (bank > 2)
+		/* switch banks */
+		i2c_smbus_write_byte_data(client, ASB100_REG_BANK, bank);
+
+	if (bank == 0 || bank > 2) {
+		res = i2c_smbus_read_byte_data(client, reg & 0xff);
+	} else {
+		/* switch to subclient */
+		cl = data->lm75[bank - 1];
+
+		/* convert from ISA to LM75 I2C addresses */
+		switch (reg & 0xff) {
+		case 0x50: /* TEMP */
+			res = i2c_smbus_read_word_swapped(cl, 0);
+			break;
+		case 0x52: /* CONFIG */
+			res = i2c_smbus_read_byte_data(cl, 1);
+			break;
+		case 0x53: /* HYST */
+			res = i2c_smbus_read_word_swapped(cl, 2);
+			break;
+		case 0x55: /* MAX */
+		default:
+			res = i2c_smbus_read_word_swapped(cl, 3);
+			break;
+		}
+	}
+
+	if (bank > 2)
+		i2c_smbus_write_byte_data(client, ASB100_REG_BANK, 0);
+
+	mutex_unlock(&data->lock);
+
+	return res;
+}
+
+static void asb100_write_value(struct i2c_client *client, u16 reg, u16 value)
+{
+	struct asb100_data *data = i2c_get_clientdata(client);
+	struct i2c_client *cl;
+	int bank;
+
+	mutex_lock(&data->lock);
+
+	bank = (reg >> 8) & 0x0f;
+	if (bank > 2)
+		/* switch banks */
+		i2c_smbus_write_byte_data(client, ASB100_REG_BANK, bank);
+
+	if (bank == 0 || bank > 2) {
+		i2c_smbus_write_byte_data(client, reg & 0xff, value & 0xff);
+	} else {
+		/* switch to subclient */
+		cl = data->lm75[bank - 1];
+
+		/* convert from ISA to LM75 I2C addresses */
+		switch (reg & 0xff) {
+		case 0x52: /* CONFIG */
+			i2c_smbus_write_byte_data(cl, 1, value & 0xff);
+			break;
+		case 0x53: /* HYST */
+			i2c_smbus_write_word_swapped(cl, 2, value);
+			break;
+		case 0x55: /* MAX */
+			i2c_smbus_write_word_swapped(cl, 3, value);
+			break;
+		}
+	}
+
+	if (bank > 2)
+		i2c_smbus_write_byte_data(client, ASB100_REG_BANK, 0);
+
+	mutex_unlock(&data->lock);
+}
+
+static void asb100_init_client(struct i2c_client *client)
+{
+	struct asb100_data *data = i2c_get_clientdata(client);
+
+	data->vrm = vid_which_vrm();
+
+	/* Start monitoring */
+	asb100_write_value(client, ASB100_REG_CONFIG,
+		(asb100_read_value(client, ASB100_REG_CONFIG) & 0xf7) | 0x01);
+}
+
+static struct asb100_data *asb100_update_device(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct asb100_data *data = i2c_get_clientdata(client);
+	int i;
+
+	mutex_lock(&data->update_lock);
+
+	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
+		|| !data->valid) {
+
+		dev_dbg(&client->dev, "starting device update...\n");
+
+		/* 7 voltage inputs */
+		for (i = 0; i < 7; i++) {
+			data->in[i] = asb100_read_value(client,
+				ASB100_REG_IN(i));
+			data->in_min[i] = asb100_read_value(client,
+				ASB100_REG_IN_MIN(i));
+			data->in_max[i] = asb100_read_value(client,
+				ASB100_REG_IN_MAX(i));
+		}
+
+		/* 3 fan inputs */
+		for (i = 0; i < 3; i++) {
+			data->fan[i] = asb100_read_value(client,
+					ASB100_REG_FAN(i));
+			data->fan_min[i] = asb100_read_value(client,
+					ASB100_REG_FAN_MIN(i));
+		}
+
+		/* 4 temperature inputs */
+		for (i = 1; i <= 4; i++) {
+			data->temp[i-1] = asb100_read_value(client,
+					ASB100_REG_TEMP(i));
+			data->temp_max[i-1] = asb100_read_value(client,
+					ASB100_REG_TEMP_MAX(i));
+			data->temp_hyst[i-1] = asb100_read_value(client,
+					ASB100_REG_TEMP_HYST(i));
+		}
+
+		/* VID and fan divisors */
+		i = asb100_read_value(client, ASB100_REG_VID_FANDIV);
+		data->vid = i & 0x0f;
+		data->vid |= (asb100_read_value(client,
+				ASB100_REG_CHIPID) & 0x01) << 4;
+		data->fan_div[0] = (i >> 4) & 0x03;
+		data->fan_div[1] = (i >> 6) & 0x03;
+		data->fan_div[2] = (asb100_read_value(client,
+				ASB100_REG_PIN) >> 6) & 0x03;
+
+		/* PWM */
+		data->pwm = asb100_read_value(client, ASB100_REG_PWM1);
+
+		/* alarms */
+		data->alarms = asb100_read_value(client, ASB100_REG_ALARM1) +
+			(asb100_read_value(client, ASB100_REG_ALARM2) << 8);
+
+		data->last_updated = jiffies;
+		data->valid = 1;
+
+		dev_dbg(&client->dev, "... device update complete\n");
+	}
+
+	mutex_unlock(&data->update_lock);
+
+	return data;
+}
+
+module_i2c_driver(asb100_driver);
+
+MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
+MODULE_DESCRIPTION("ASB100 Bach driver");
+MODULE_LICENSE("GPL");