hwmon: Driver for Linear Technologies LTC2945

LTC2945 is a system monitor that measures current, voltage, and power.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/Documentation/hwmon/ltc2945 b/Documentation/hwmon/ltc2945
new file mode 100644 (file)
index 0000000..f8d0f7f
--- /dev/null
+++ b/Documentation/hwmon/ltc2945
@@ -0,0 +1,84 @@
+Kernel driver ltc2945
+=====================
+
+Supported chips:
+  * Linear Technology LTC2945
+    Prefix: 'ltc2945'
+    Addresses scanned: -
+    Datasheet:
+        http://cds.linear.com/docs/en/datasheet/2945fa.pdf
+
+Author: Guenter Roeck <linux@roeck-us.net>
+
+
+Description
+-----------
+
+The LTC2945  is a rail-to-rail system monitor that measures current, voltage,
+and power consumption.
+
+
+Usage Notes
+-----------
+
+This driver does not probe for LTC2945 devices, since there is no register
+which can be safely used to identify the chip. You will have to instantiate
+the devices explicitly.
+
+Example: the following will load the driver for an LTC2945 at address 0x10
+on I2C bus #1:
+$ modprobe ltc2945
+$ echo ltc2945 0x10 > /sys/bus/i2c/devices/i2c-1/new_device
+
+
+Sysfs entries
+-------------
+
+Voltage readings provided by this driver are reported as obtained from the ADC
+registers. If a set of voltage divider resistors is installed, calculate the
+real voltage by multiplying the reported value with (R1+R2)/R2, where R1 is the
+value of the divider resistor against the measured voltage and R2 is the value
+of the divider resistor against Ground.
+
+Current reading provided by this driver is reported as obtained from the ADC
+Current Sense register. The reported value assumes that a 1 mOhm sense resistor
+is installed. If a different sense resistor is installed, calculate the real
+current by dividing the reported value by the sense resistor value in mOhm.
+
+in1_input              VIN voltage (mV). Voltage is measured either at
+                       SENSE+ or VDD pin depending on chip configuration.
+in1_min                        Undervoltage threshold
+in1_max                        Overvoltage threshold
+in1_lowest             Lowest measured voltage
+in1_highest            Highest measured voltage
+in1_reset_history      Write 1 to reset in1 history
+in1_min_alarm          Undervoltage alarm
+in1_max_alarm          Overvoltage alarm
+
+in2_input              ADIN voltage (mV)
+in2_min                        Undervoltage threshold
+in2_max                        Overvoltage threshold
+in2_lowest             Lowest measured voltage
+in2_highest            Highest measured voltage
+in2_reset_history      Write 1 to reset in2 history
+in2_min_alarm          Undervoltage alarm
+in2_max_alarm          Overvoltage alarm
+
+curr1_input            SENSE current (mA)
+curr1_min              Undercurrent threshold
+curr1_max              Overcurrent threshold
+curr1_lowest           Lowest measured current
+curr1_highest          Highest measured current
+curr1_reset_history    Write 1 to reset curr1 history
+curr1_min_alarm                Undercurrent alarm
+curr1_max_alarm                Overcurrent alarm
+
+power1_input           Power (in uW). Power is calculated based on SENSE+/VDD
+                       voltage or ADIN voltage depending on chip configuration.
+power1_min             Low lower threshold
+power1_max             High power threshold
+power1_input_lowest    Historical minimum power use
+power1_input_highest   Historical maximum power use
+power1_reset_history   Write 1 to reset power1 history
+power1_min_alarm       Low power alarm
+power1_max_alarm       High power alarm

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 436c611..5bbc55b 100644 (file)
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -776,6 +776,18 @@ config SENSORS_LM93
          This driver can also be built as a module.  If so, the module
          will be called lm93.
 
+config SENSORS_LTC2945
+       tristate "Linear Technology LTC2945"
+       depends on I2C
+       select REGMAP_I2C
+       default n
+       help
+         If you say yes here you get support for Linear Technology LTC2945
+         I2C System Monitor.
+
+         This driver can also be built as a module. If so, the module will
+         be called ltc2945.
+
 config SENSORS_LTC4151
        tristate "Linear Technology LTC4151"
        depends on I2C

diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index cdf3258..355200b 100644 (file)
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -95,6 +95,7 @@ obj-$(CONFIG_SENSORS_LM93)    += lm93.o
 obj-$(CONFIG_SENSORS_LM95234)  += lm95234.o
 obj-$(CONFIG_SENSORS_LM95241)  += lm95241.o
 obj-$(CONFIG_SENSORS_LM95245)  += lm95245.o
+obj-$(CONFIG_SENSORS_LTC2945)  += ltc2945.o
 obj-$(CONFIG_SENSORS_LTC4151)  += ltc4151.o
 obj-$(CONFIG_SENSORS_LTC4215)  += ltc4215.o
 obj-$(CONFIG_SENSORS_LTC4222)  += ltc4222.o

diff --git a/drivers/hwmon/ltc2945.c b/drivers/hwmon/ltc2945.c
new file mode 100644 (file)
index 0000000..c104cc3
--- /dev/null
+++ b/drivers/hwmon/ltc2945.c
@@ -0,0 +1,519 @@
+/*
+ * Driver for Linear Technology LTC2945 I2C Power Monitor
+ *
+ * Copyright (c) 2014 Guenter Roeck
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/jiffies.h>
+#include <linux/regmap.h>
+
+/* chip registers */
+#define LTC2945_CONTROL                        0x00
+#define LTC2945_ALERT                  0x01
+#define LTC2945_STATUS                 0x02
+#define LTC2945_FAULT                  0x03
+#define LTC2945_POWER_H                        0x05
+#define LTC2945_MAX_POWER_H            0x08
+#define LTC2945_MIN_POWER_H            0x0b
+#define LTC2945_MAX_POWER_THRES_H      0x0e
+#define LTC2945_MIN_POWER_THRES_H      0x11
+#define LTC2945_SENSE_H                        0x14
+#define LTC2945_MAX_SENSE_H            0x16
+#define LTC2945_MIN_SENSE_H            0x18
+#define LTC2945_MAX_SENSE_THRES_H      0x1a
+#define LTC2945_MIN_SENSE_THRES_H      0x1c
+#define LTC2945_VIN_H                  0x1e
+#define LTC2945_MAX_VIN_H              0x20
+#define LTC2945_MIN_VIN_H              0x22
+#define LTC2945_MAX_VIN_THRES_H                0x24
+#define LTC2945_MIN_VIN_THRES_H                0x26
+#define LTC2945_ADIN_H                 0x28
+#define LTC2945_MAX_ADIN_H             0x2a
+#define LTC2945_MIN_ADIN_H             0x2c
+#define LTC2945_MAX_ADIN_THRES_H       0x2e
+#define LTC2945_MIN_ADIN_THRES_H       0x30
+#define LTC2945_MIN_ADIN_THRES_L       0x31
+
+/* Fault register bits */
+
+#define FAULT_ADIN_UV          (1 << 0)
+#define FAULT_ADIN_OV          (1 << 1)
+#define FAULT_VIN_UV           (1 << 2)
+#define FAULT_VIN_OV           (1 << 3)
+#define FAULT_SENSE_UV         (1 << 4)
+#define FAULT_SENSE_OV         (1 << 5)
+#define FAULT_POWER_UV         (1 << 6)
+#define FAULT_POWER_OV         (1 << 7)
+
+/* Control register bits */
+
+#define CONTROL_MULT_SELECT    (1 << 0)
+#define CONTROL_TEST_MODE      (1 << 4)
+
+static inline bool is_power_reg(u8 reg)
+{
+       return reg < LTC2945_SENSE_H;
+}
+
+/* Return the value from the given register in uW, mV, or mA */
+static long long ltc2945_reg_to_val(struct device *dev, u8 reg)
+{
+       struct regmap *regmap = dev_get_drvdata(dev);
+       unsigned int control;
+       u8 buf[3];
+       long long val;
+       int ret;
+
+       ret = regmap_bulk_read(regmap, reg, buf,
+                              is_power_reg(reg) ? 3 : 2);
+       if (ret < 0)
+               return ret;
+
+       if (is_power_reg(reg)) {
+               /* power */
+               val = (buf[0] << 16) + (buf[1] << 8) + buf[2];
+       } else {
+               /* current, voltage */
+               val = (buf[0] << 4) + (buf[1] >> 4);
+       }
+
+       switch (reg) {
+       case LTC2945_POWER_H:
+       case LTC2945_MAX_POWER_H:
+       case LTC2945_MIN_POWER_H:
+       case LTC2945_MAX_POWER_THRES_H:
+       case LTC2945_MIN_POWER_THRES_H:
+               /*
+                * Convert to uW by assuming current is measured with
+                * an 1mOhm sense resistor, similar to current
+                * measurements.
+                * Control register bit 0 selects if voltage at SENSE+/VDD
+                * or voltage at ADIN is used to measure power.
+                */
+               ret = regmap_read(regmap, LTC2945_CONTROL, &control);
+               if (ret < 0)
+                       return ret;
+               if (control & CONTROL_MULT_SELECT) {
+                       /* 25 mV * 25 uV = 0.625 uV resolution. */
+                       val *= 625LL;
+               } else {
+                       /* 0.5 mV * 25 uV = 0.0125 uV resolution. */
+                       val = (val * 25LL) >> 1;
+               }
+               break;
+       case LTC2945_VIN_H:
+       case LTC2945_MAX_VIN_H:
+       case LTC2945_MIN_VIN_H:
+       case LTC2945_MAX_VIN_THRES_H:
+       case LTC2945_MIN_VIN_THRES_H:
+               /* 25 mV resolution. Convert to mV. */
+               val *= 25;
+               break;
+       case LTC2945_ADIN_H:
+       case LTC2945_MAX_ADIN_H:
+       case LTC2945_MIN_ADIN_THRES_H:
+       case LTC2945_MAX_ADIN_THRES_H:
+       case LTC2945_MIN_ADIN_H:
+               /* 0.5mV resolution. Convert to mV. */
+               val = val >> 1;
+               break;
+       case LTC2945_SENSE_H:
+       case LTC2945_MAX_SENSE_H:
+       case LTC2945_MIN_SENSE_H:
+       case LTC2945_MAX_SENSE_THRES_H:
+       case LTC2945_MIN_SENSE_THRES_H:
+               /*
+                * 25 uV resolution. Convert to current as measured with
+                * an 1 mOhm sense resistor, in mA. If a different sense
+                * resistor is installed, calculate the actual current by
+                * dividing the reported current by the sense resistor value
+                * in mOhm.
+                */
+               val *= 25;
+               break;
+       default:
+               return -EINVAL;
+       }
+       return val;
+}
+
+static int ltc2945_val_to_reg(struct device *dev, u8 reg,
+                             unsigned long val)
+{
+       struct regmap *regmap = dev_get_drvdata(dev);
+       unsigned int control;
+       int ret;
+
+       switch (reg) {
+       case LTC2945_POWER_H:
+       case LTC2945_MAX_POWER_H:
+       case LTC2945_MIN_POWER_H:
+       case LTC2945_MAX_POWER_THRES_H:
+       case LTC2945_MIN_POWER_THRES_H:
+               /*
+                * Convert to register value by assuming current is measured
+                * with an 1mOhm sense resistor, similar to current
+                * measurements.
+                * Control register bit 0 selects if voltage at SENSE+/VDD
+                * or voltage at ADIN is used to measure power, which in turn
+                * determines register calculations.
+                */
+               ret = regmap_read(regmap, LTC2945_CONTROL, &control);
+               if (ret < 0)
+                       return ret;
+               if (control & CONTROL_MULT_SELECT) {
+                       /* 25 mV * 25 uV = 0.625 uV resolution. */
+                       val = DIV_ROUND_CLOSEST(val, 625);
+               } else {
+                       /*
+                        * 0.5 mV * 25 uV = 0.0125 uV resolution.
+                        * Divide first to avoid overflow;
+                        * accept loss of accuracy.
+                        */
+                       val = DIV_ROUND_CLOSEST(val, 25) * 2;
+               }
+               break;
+       case LTC2945_VIN_H:
+       case LTC2945_MAX_VIN_H:
+       case LTC2945_MIN_VIN_H:
+       case LTC2945_MAX_VIN_THRES_H:
+       case LTC2945_MIN_VIN_THRES_H:
+               /* 25 mV resolution. */
+               val /= 25;
+               break;
+       case LTC2945_ADIN_H:
+       case LTC2945_MAX_ADIN_H:
+       case LTC2945_MIN_ADIN_THRES_H:
+       case LTC2945_MAX_ADIN_THRES_H:
+       case LTC2945_MIN_ADIN_H:
+               /* 0.5mV resolution. */
+               val *= 2;
+               break;
+       case LTC2945_SENSE_H:
+       case LTC2945_MAX_SENSE_H:
+       case LTC2945_MIN_SENSE_H:
+       case LTC2945_MAX_SENSE_THRES_H:
+       case LTC2945_MIN_SENSE_THRES_H:
+               /*
+                * 25 uV resolution. Convert to current as measured with
+                * an 1 mOhm sense resistor, in mA. If a different sense
+                * resistor is installed, calculate the actual current by
+                * dividing the reported current by the sense resistor value
+                * in mOhm.
+                */
+               val = DIV_ROUND_CLOSEST(val, 25);
+               break;
+       default:
+               return -EINVAL;
+       }
+       return val;
+}
+
+static ssize_t ltc2945_show_value(struct device *dev,
+                                 struct device_attribute *da, char *buf)
+{
+       struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+       long long value;
+
+       value = ltc2945_reg_to_val(dev, attr->index);
+       if (value < 0)
+               return value;
+       return snprintf(buf, PAGE_SIZE, "%lld\n", value);
+}
+
+static ssize_t ltc2945_set_value(struct device *dev,
+                                    struct device_attribute *da,
+                                    const char *buf, size_t count)
+{
+       struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+       struct regmap *regmap = dev_get_drvdata(dev);
+       u8 reg = attr->index;
+       unsigned long val;
+       u8 regbuf[3];
+       int num_regs;
+       int regval;
+       int ret;
+
+       ret = kstrtoul(buf, 10, &val);
+       if (ret)
+               return ret;
+
+       /* convert to register value, then clamp and write result */
+       regval = ltc2945_val_to_reg(dev, reg, val);
+       if (is_power_reg(reg)) {
+               regval = clamp_val(regval, 0, 0xffffff);
+               regbuf[0] = regval >> 16;
+               regbuf[1] = (regval >> 8) & 0xff;
+               regbuf[2] = regval;
+               num_regs = 3;
+       } else {
+               regval = clamp_val(regval, 0, 0xfff) << 4;
+               regbuf[0] = regval >> 8;
+               regbuf[1] = regval & 0xff;
+               num_regs = 2;
+       }
+       ret = regmap_bulk_write(regmap, reg, regbuf, num_regs);
+       return ret < 0 ? ret : count;
+}
+
+static ssize_t ltc2945_reset_history(struct device *dev,
+                                    struct device_attribute *da,
+                                    const char *buf, size_t count)
+{
+       struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+       struct regmap *regmap = dev_get_drvdata(dev);
+       u8 reg = attr->index;
+       int num_regs = is_power_reg(reg) ? 3 : 2;
+       u8 buf_min[3] = { 0xff, 0xff, 0xff };
+       u8 buf_max[3] = { 0, 0, 0 };
+       unsigned long val;
+       int ret;
+
+       ret = kstrtoul(buf, 10, &val);
+       if (ret)
+               return ret;
+       if (val != 1)
+               return -EINVAL;
+
+       ret = regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE,
+                                CONTROL_TEST_MODE);
+
+       /* Reset minimum */
+       ret = regmap_bulk_write(regmap, reg, buf_min, num_regs);
+       if (ret)
+               return ret;
+
+       switch (reg) {
+       case LTC2945_MIN_POWER_H:
+               reg = LTC2945_MAX_POWER_H;
+               break;
+       case LTC2945_MIN_SENSE_H:
+               reg = LTC2945_MAX_SENSE_H;
+               break;
+       case LTC2945_MIN_VIN_H:
+               reg = LTC2945_MAX_VIN_H;
+               break;
+       case LTC2945_MIN_ADIN_H:
+               reg = LTC2945_MAX_ADIN_H;
+               break;
+       default:
+               BUG();
+               break;
+       }
+       /* Reset maximum */
+       ret = regmap_bulk_write(regmap, reg, buf_max, num_regs);
+
+       /* Try resetting test mode even if there was an error */
+       regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE, 0);
+
+       return ret ? : count;
+}
+
+static ssize_t ltc2945_show_bool(struct device *dev,
+                                struct device_attribute *da, char *buf)
+{
+       struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+       struct regmap *regmap = dev_get_drvdata(dev);
+       unsigned int fault;
+       int ret;
+
+       ret = regmap_read(regmap, LTC2945_FAULT, &fault);
+       if (ret < 0)
+               return ret;
+
+       fault &= attr->index;
+       if (fault)              /* Clear reported faults in chip register */
+               regmap_update_bits(regmap, LTC2945_FAULT, attr->index, 0);
+
+       return snprintf(buf, PAGE_SIZE, "%d\n", !!fault);
+}
+
+/* Input voltages */
+
+static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ltc2945_show_value, NULL,
+                         LTC2945_VIN_H);
+static SENSOR_DEVICE_ATTR(in1_min, S_IRUGO | S_IWUSR, ltc2945_show_value,
+                         ltc2945_set_value, LTC2945_MIN_VIN_THRES_H);
+static SENSOR_DEVICE_ATTR(in1_max, S_IRUGO | S_IWUSR, ltc2945_show_value,
+                         ltc2945_set_value, LTC2945_MAX_VIN_THRES_H);
+static SENSOR_DEVICE_ATTR(in1_lowest, S_IRUGO, ltc2945_show_value, NULL,
+                         LTC2945_MIN_VIN_H);
+static SENSOR_DEVICE_ATTR(in1_highest, S_IRUGO, ltc2945_show_value, NULL,
+                         LTC2945_MAX_VIN_H);
+static SENSOR_DEVICE_ATTR(in1_reset_history, S_IWUSR, NULL,
+                         ltc2945_reset_history, LTC2945_MIN_VIN_H);
+
+static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, ltc2945_show_value, NULL,
+                         LTC2945_ADIN_H);
+static SENSOR_DEVICE_ATTR(in2_min, S_IRUGO | S_IWUSR, ltc2945_show_value,
+                         ltc2945_set_value, LTC2945_MIN_ADIN_THRES_H);
+static SENSOR_DEVICE_ATTR(in2_max, S_IRUGO | S_IWUSR, ltc2945_show_value,
+                         ltc2945_set_value, LTC2945_MAX_ADIN_THRES_H);
+static SENSOR_DEVICE_ATTR(in2_lowest, S_IRUGO, ltc2945_show_value, NULL,
+                         LTC2945_MIN_ADIN_H);
+static SENSOR_DEVICE_ATTR(in2_highest, S_IRUGO, ltc2945_show_value, NULL,
+                         LTC2945_MAX_ADIN_H);
+static SENSOR_DEVICE_ATTR(in2_reset_history, S_IWUSR, NULL,
+                         ltc2945_reset_history, LTC2945_MIN_ADIN_H);
+
+/* Voltage alarms */
+
+static SENSOR_DEVICE_ATTR(in1_min_alarm, S_IRUGO, ltc2945_show_bool, NULL,
+                         FAULT_VIN_UV);
+static SENSOR_DEVICE_ATTR(in1_max_alarm, S_IRUGO, ltc2945_show_bool, NULL,
+                         FAULT_VIN_OV);
+static SENSOR_DEVICE_ATTR(in2_min_alarm, S_IRUGO, ltc2945_show_bool, NULL,
+                         FAULT_ADIN_UV);
+static SENSOR_DEVICE_ATTR(in2_max_alarm, S_IRUGO, ltc2945_show_bool, NULL,
+                         FAULT_ADIN_OV);
+
+/* Currents (via sense resistor) */
+
+static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ltc2945_show_value, NULL,
+                         LTC2945_SENSE_H);
+static SENSOR_DEVICE_ATTR(curr1_min, S_IRUGO | S_IWUSR, ltc2945_show_value,
+                         ltc2945_set_value, LTC2945_MIN_SENSE_THRES_H);
+static SENSOR_DEVICE_ATTR(curr1_max, S_IRUGO | S_IWUSR, ltc2945_show_value,
+                         ltc2945_set_value, LTC2945_MAX_SENSE_THRES_H);
+static SENSOR_DEVICE_ATTR(curr1_lowest, S_IRUGO, ltc2945_show_value, NULL,
+                         LTC2945_MIN_SENSE_H);
+static SENSOR_DEVICE_ATTR(curr1_highest, S_IRUGO, ltc2945_show_value, NULL,
+                         LTC2945_MAX_SENSE_H);
+static SENSOR_DEVICE_ATTR(curr1_reset_history, S_IWUSR, NULL,
+                         ltc2945_reset_history, LTC2945_MIN_SENSE_H);
+
+/* Current alarms */
+
+static SENSOR_DEVICE_ATTR(curr1_min_alarm, S_IRUGO, ltc2945_show_bool, NULL,
+                         FAULT_SENSE_UV);
+static SENSOR_DEVICE_ATTR(curr1_max_alarm, S_IRUGO, ltc2945_show_bool, NULL,
+                         FAULT_SENSE_OV);
+
+/* Power */
+
+static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ltc2945_show_value, NULL,
+                         LTC2945_POWER_H);
+static SENSOR_DEVICE_ATTR(power1_min, S_IRUGO | S_IWUSR, ltc2945_show_value,
+                         ltc2945_set_value, LTC2945_MIN_POWER_THRES_H);
+static SENSOR_DEVICE_ATTR(power1_max, S_IRUGO | S_IWUSR, ltc2945_show_value,
+                         ltc2945_set_value, LTC2945_MAX_POWER_THRES_H);
+static SENSOR_DEVICE_ATTR(power1_input_lowest, S_IRUGO, ltc2945_show_value,
+                         NULL, LTC2945_MIN_POWER_H);
+static SENSOR_DEVICE_ATTR(power1_input_highest, S_IRUGO, ltc2945_show_value,
+                         NULL, LTC2945_MAX_POWER_H);
+static SENSOR_DEVICE_ATTR(power1_reset_history, S_IWUSR, NULL,
+                         ltc2945_reset_history, LTC2945_MIN_POWER_H);
+
+/* Power alarms */
+
+static SENSOR_DEVICE_ATTR(power1_min_alarm, S_IRUGO, ltc2945_show_bool, NULL,
+                         FAULT_POWER_UV);
+static SENSOR_DEVICE_ATTR(power1_max_alarm, S_IRUGO, ltc2945_show_bool, NULL,
+                         FAULT_POWER_OV);
+
+static struct attribute *ltc2945_attrs[] = {
+       &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_in1_lowest.dev_attr.attr,
+       &sensor_dev_attr_in1_highest.dev_attr.attr,
+       &sensor_dev_attr_in1_reset_history.dev_attr.attr,
+       &sensor_dev_attr_in1_min_alarm.dev_attr.attr,
+       &sensor_dev_attr_in1_max_alarm.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_in2_lowest.dev_attr.attr,
+       &sensor_dev_attr_in2_highest.dev_attr.attr,
+       &sensor_dev_attr_in2_reset_history.dev_attr.attr,
+       &sensor_dev_attr_in2_min_alarm.dev_attr.attr,
+       &sensor_dev_attr_in2_max_alarm.dev_attr.attr,
+
+       &sensor_dev_attr_curr1_input.dev_attr.attr,
+       &sensor_dev_attr_curr1_min.dev_attr.attr,
+       &sensor_dev_attr_curr1_max.dev_attr.attr,
+       &sensor_dev_attr_curr1_lowest.dev_attr.attr,
+       &sensor_dev_attr_curr1_highest.dev_attr.attr,
+       &sensor_dev_attr_curr1_reset_history.dev_attr.attr,
+       &sensor_dev_attr_curr1_min_alarm.dev_attr.attr,
+       &sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
+
+       &sensor_dev_attr_power1_input.dev_attr.attr,
+       &sensor_dev_attr_power1_min.dev_attr.attr,
+       &sensor_dev_attr_power1_max.dev_attr.attr,
+       &sensor_dev_attr_power1_input_lowest.dev_attr.attr,
+       &sensor_dev_attr_power1_input_highest.dev_attr.attr,
+       &sensor_dev_attr_power1_reset_history.dev_attr.attr,
+       &sensor_dev_attr_power1_min_alarm.dev_attr.attr,
+       &sensor_dev_attr_power1_max_alarm.dev_attr.attr,
+
+       NULL,
+};
+ATTRIBUTE_GROUPS(ltc2945);
+
+static struct regmap_config ltc2945_regmap_config = {
+       .reg_bits = 8,
+       .val_bits = 8,
+       .max_register = LTC2945_MIN_ADIN_THRES_L,
+};
+
+static int ltc2945_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+       struct device *dev = &client->dev;
+       struct device *hwmon_dev;
+       struct regmap *regmap;
+
+       regmap = devm_regmap_init_i2c(client, &ltc2945_regmap_config);
+       if (IS_ERR(regmap)) {
+               dev_err(dev, "failed to allocate register map\n");
+               return PTR_ERR(regmap);
+       }
+
+       /* Clear faults */
+       regmap_write(regmap, LTC2945_FAULT, 0x00);
+
+       hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
+                                                          regmap,
+                                                          ltc2945_groups);
+       return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct i2c_device_id ltc2945_id[] = {
+       {"ltc2945", 0},
+       { }
+};
+
+MODULE_DEVICE_TABLE(i2c, ltc2945_id);
+
+static struct i2c_driver ltc2945_driver = {
+       .driver = {
+                  .name = "ltc2945",
+                  },
+       .probe = ltc2945_probe,
+       .id_table = ltc2945_id,
+};
+
+module_i2c_driver(ltc2945_driver);
+
+MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
+MODULE_DESCRIPTION("LTC2945 driver");
+MODULE_LICENSE("GPL");