Date:   Thu, 29 Oct 2020 11:49:09 +0200
From:   <alexandru.tachici@...log.com>
To:     <linux-hwmon@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
CC:     <robh+dt@...nel.org>, <linux@...ck-us.net>,
        Alexandru Tachici <alexandru.tachici@...log.com>
Subject: [PATCH 1/3] hwmon: ltc2992: Add support

From: Alexandru Tachici <alexandru.tachici@...log.com>

LTC2992 is a rail-to-rail system monitor that
measures current, voltage, and power of two supplies.

Two ADCs simultaneously measure each supply’s current.
A third ADC monitors the input voltages and four
auxiliary external voltages.

Signed-off-by: Alexandru Tachici <alexandru.tachici@...log.com>
---
 Documentation/hwmon/index.rst   |   1 +
 Documentation/hwmon/ltc2992.rst |  51 +++
 drivers/hwmon/Kconfig           |  11 +
 drivers/hwmon/Makefile          |   1 +
 drivers/hwmon/ltc2992.c         | 735 ++++++++++++++++++++++++++++++++
 5 files changed, 799 insertions(+)
 create mode 100644 Documentation/hwmon/ltc2992.rst
 create mode 100644 drivers/hwmon/ltc2992.c

diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index e6b91ab12978..f759d70ae9fd 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -104,6 +104,7 @@ Hardware Monitoring Kernel Drivers
    ltc2947
    ltc2978
    ltc2990
+   ltc2992
    ltc3815
    ltc4151
    ltc4215
diff --git a/Documentation/hwmon/ltc2992.rst b/Documentation/hwmon/ltc2992.rst
new file mode 100644
index 000000000000..1dd48ef9f655
--- /dev/null
+++ b/Documentation/hwmon/ltc2992.rst
@@ -0,0 +1,51 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver ltc2992
+=====================
+
+Supported chips:
+  * Linear Technology LTC2992
+    Prefix: 'ltc2992'
+    Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltc2992.pdf
+
+Author: Alexandru Tachici <alexandru.tachici@...log.com>
+
+
+Description
+-----------
+
+This driver supports hardware monitoring for Linear Technology LTC2992 power monitor.
+
+LTC2992 is is a rail-to-rail system monitor that measures current,
+voltage, and power of two supplies.
+
+Two ADCs simultaneously measure each supply’s current. A third ADC monitors
+the input voltages and four auxiliary external voltages.
+
+
+Sysfs entries
+-------------
+
+The following attributes are supported. Limits are read-write,
+all other attributes are read-only.
+
+inX_input		Measured voltage.
+inX_min			Minimum voltage.
+inX_max			Maximum voltage.
+inX_min_alarm		Voltage low alarm.
+inX_max_alarm		Voltage high alarm.
+inX_alarm		An overvoltage or undervoltage occured. Cleared on read.
+
+currX_input		Measured current.
+currX_min		Minimum current.
+currX_max		Maximum current.
+currX_min_alarm		Current low alarm.
+currX_max_alarm		Current high alarm.
+currX_alarm		An overvoltage or undervoltage occured. Cleared on read.
+
+powerX_input		Measured power.
+powerX_min		Minimum power.
+powerX_max		Maximum power.
+powerX_min_alarm	Power low alarm.
+powerX_max_alarm	Power high alarm.
+powerX_alarm		An overpower or underpower occured. Cleared on read.
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index a850e4f0e0bd..bf9e387270d6 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -858,6 +858,17 @@ config SENSORS_LTC2990
 	  This driver can also be built as a module. If so, the module will
 	  be called ltc2990.
 
+config SENSORS_LTC2992
+	tristate "Linear Technology LTC2992"
+	depends on I2C
+	help
+	  If you say yes here you get support for Linear Technology LTC2992
+	  I2C System Monitor. The LTC2992 measures current, voltage, and
+	  power of two supplies.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called ltc2992.
+
 config SENSORS_LTC4151
 	tristate "Linear Technology LTC4151"
 	depends on I2C
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 9db2903b61e5..d6172c4807c4 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -118,6 +118,7 @@ obj-$(CONFIG_SENSORS_LTC2947)	+= ltc2947-core.o
 obj-$(CONFIG_SENSORS_LTC2947_I2C) += ltc2947-i2c.o
 obj-$(CONFIG_SENSORS_LTC2947_SPI) += ltc2947-spi.o
 obj-$(CONFIG_SENSORS_LTC2990)	+= ltc2990.o
+obj-$(CONFIG_SENSORS_LTC2992)	+= ltc2992.o
 obj-$(CONFIG_SENSORS_LTC4151)	+= ltc4151.o
 obj-$(CONFIG_SENSORS_LTC4215)	+= ltc4215.o
 obj-$(CONFIG_SENSORS_LTC4222)	+= ltc4222.o
diff --git a/drivers/hwmon/ltc2992.c b/drivers/hwmon/ltc2992.c
new file mode 100644
index 000000000000..940d92b4a1d0
--- /dev/null
+++ b/drivers/hwmon/ltc2992.c
@@ -0,0 +1,735 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/*
+ * LTC2992 - Dual Wide Range Power Monitor
+ *
+ * Copyright 2020 Analog Devices Inc.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/bits.h>
+#include <linux/err.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+
+#define LTC2992_CTRLB			0x01
+#define LTC2992_FAULT1			0x03
+#define LTC2992_POWER1			0x05
+#define LTC2992_POWER1_MAX		0x08
+#define LTC2992_POWER1_MIN		0x0B
+#define LTC2992_POWER1_MAX_THRESH	0x0E
+#define LTC2992_POWER1_MIN_THRESH	0x11
+#define LTC2992_DSENSE1			0x14
+#define LTC2992_DSENSE1_MAX		0x16
+#define LTC2992_DSENSE1_MIN		0x18
+#define LTC2992_DSENSE1_MAX_THRESH	0x1A
+#define LTC2992_DSENSE1_MIN_THRESH	0x1C
+#define LTC2992_SENSE1			0x1E
+#define LTC2992_SENSE1_MAX		0x20
+#define LTC2992_SENSE1_MIN		0x22
+#define LTC2992_SENSE1_MAX_THRESH	0x24
+#define LTC2992_SENSE1_MIN_THRESH	0x26
+#define LTC2992_G1			0x28
+#define LTC2992_G1_MAX			0x2A
+#define LTC2992_G1_MIN			0x2C
+#define LTC2992_G1_MAX_THRESH		0x2E
+#define LTC2992_G1_MIN_THRESH		0x30
+#define LTC2992_FAULT2			0x35
+#define LTC2992_G2			0x5A
+#define LTC2992_G2_MAX			0x5C
+#define LTC2992_G2_MIN			0x5E
+#define LTC2992_G2_MAX_THRESH		0x60
+#define LTC2992_G2_MIN_THRESH		0x62
+#define LTC2992_G3			0x64
+#define LTC2992_G3_MAX			0x66
+#define LTC2992_G3_MIN			0x68
+#define LTC2992_G3_MAX_THRESH		0x6A
+#define LTC2992_G3_MIN_THRESH		0x6C
+#define LTC2992_G4			0x6E
+#define LTC2992_G4_MAX			0x70
+#define LTC2992_G4_MIN			0x72
+#define LTC2992_G4_MAX_THRESH		0x74
+#define LTC2992_G4_MIN_THRESH		0x76
+#define LTC2992_FAULT3			0x92
+
+#define LTC2992_POWER(x)		(LTC2992_POWER1 + ((x) * 0x32))
+#define LTC2992_POWER_MAX(x)		(LTC2992_POWER1_MAX + ((x) * 0x32))
+#define LTC2992_POWER_MIN(x)		(LTC2992_POWER1_MIN + ((x) * 0x32))
+#define LTC2992_POWER_MAX_THRESH(x)	(LTC2992_POWER1_MAX_THRESH + ((x) * 0x32))
+#define LTC2992_POWER_MIN_THRESH(x)	(LTC2992_POWER1_MIN_THRESH + ((x) * 0x32))
+#define LTC2992_DSENSE(x)		(LTC2992_DSENSE1 + ((x) * 0x32))
+#define LTC2992_DSENSE_MAX(x)		(LTC2992_DSENSE1_MAX + ((x) * 0x32))
+#define LTC2992_DSENSE_MIN(x)		(LTC2992_DSENSE1_MIN + ((x) * 0x32))
+#define LTC2992_DSENSE_MAX_THRESH(x)	(LTC2992_DSENSE1_MAX_THRESH + ((x) * 0x32))
+#define LTC2992_DSENSE_MIN_THRESH(x)	(LTC2992_DSENSE1_MIN_THRESH + ((x) * 0x32))
+#define LTC2992_SENSE(x)		(LTC2992_SENSE1 + ((x) * 0x32))
+#define LTC2992_SENSE_MAX(x)		(LTC2992_SENSE1_MAX + ((x) * 0x32))
+#define LTC2992_SENSE_MIN(x)		(LTC2992_SENSE1_MIN + ((x) * 0x32))
+#define LTC2992_SENSE_MAX_THRESH(x)	(LTC2992_SENSE1_MAX_THRESH + ((x) * 0x32))
+#define LTC2992_SENSE_MIN_THRESH(x)	(LTC2992_SENSE1_MIN_THRESH + ((x) * 0x32))
+#define LTC2992_POWER_FAULT(x)		(LTC2992_FAULT1 + ((x) * 0x32))
+#define LTC2992_SENSE_FAULT(x)		(LTC2992_FAULT1 + ((x) * 0x32))
+#define LTC2992_DSENSE_FAULT(x)		(LTC2992_FAULT1 + ((x) * 0x32))
+
+/* FAULT1 FAULT2 registers common bitfields */
+#define LTC2992_POWER_FAULT_MSK		GENMASK(7, 6)
+#define LTC2992_DSENSE_FAULT_MSK	GENMASK(5, 4)
+#define LTC2992_SENSE_FAULT_MSK		GENMASK(3, 2)
+
+/* FAULT1 bitfields */
+#define LTC2992_GPIO1_FAULT_MSK		GENMASK(1, 0)
+
+/* FAULT2 bitfields */
+#define LTC2992_GPIO2_FAULT_MSK		GENMASK(1, 0)
+
+/* FAULT3 bitfields */
+#define LTC2992_GPIO3_FAULT_MSK		GENMASK(7, 6)
+#define LTC2992_GPIO4_FAULT_MSK		GENMASK(5, 4)
+
+#define LTC2992_IADC_NANOV_LSB		12500
+#define LTC2992_VADC_UV_LSB		25000
+#define LTC2992_VADC_GPIO_UV_LSB	500
+
+struct ltc2992_state {
+	struct i2c_client		*client;
+	struct regmap			*regmap;
+	u32				r_sense_uohm[2];
+};
+
+struct ltc2992_gpio_regs {
+	u8	data;
+	u8	max;
+	u8	min;
+	u8	max_thresh;
+	u8	min_thresh;
+	u8	alarm;
+	u8	alarm_msk;
+};
+
+static const struct ltc2992_gpio_regs ltc2992_gpio_addr_map[] = {
+	{
+		.data = LTC2992_G1,
+		.max = LTC2992_G1_MAX,
+		.min = LTC2992_G1_MIN,
+		.max_thresh = LTC2992_G1_MAX_THRESH,
+		.min_thresh = LTC2992_G1_MIN_THRESH,
+		.alarm = LTC2992_FAULT1,
+		.alarm_msk = LTC2992_GPIO1_FAULT_MSK,
+	},
+	{
+		.data = LTC2992_G2,
+		.max = LTC2992_G2_MAX,
+		.min = LTC2992_G2_MIN,
+		.max_thresh = LTC2992_G2_MAX_THRESH,
+		.min_thresh = LTC2992_G2_MIN_THRESH,
+		.alarm = LTC2992_FAULT2,
+		.alarm_msk = LTC2992_GPIO2_FAULT_MSK,
+	},
+	{
+		.data = LTC2992_G3,
+		.max = LTC2992_G3_MAX,
+		.min = LTC2992_G3_MIN,
+		.max_thresh = LTC2992_G3_MAX_THRESH,
+		.min_thresh = LTC2992_G3_MIN_THRESH,
+		.alarm = LTC2992_FAULT3,
+		.alarm_msk = LTC2992_GPIO3_FAULT_MSK,
+	},
+	{
+		.data = LTC2992_G4,
+		.max = LTC2992_G4_MAX,
+		.min = LTC2992_G4_MIN,
+		.max_thresh = LTC2992_G4_MAX_THRESH,
+		.min_thresh = LTC2992_G4_MIN_THRESH,
+		.alarm = LTC2992_FAULT3,
+		.alarm_msk = LTC2992_GPIO4_FAULT_MSK,
+	},
+};
+
+static int ltc2992_read_reg(struct ltc2992_state *st, u8 addr, const u8 reg_len, u32 *val)
+{
+	u8 regvals[4];
+	int ret;
+	int i;
+
+	ret = regmap_bulk_read(st->regmap, addr, regvals, reg_len);
+	if (ret < 0)
+		return ret;
+
+	*val = 0;
+	for (i = 0; i < reg_len; i++)
+		*val |= regvals[reg_len - i - 1] << (i * 8);
+
+	return 0;
+}
+
+static int ltc2992_write_reg(struct ltc2992_state *st, u8 addr, const u8 reg_len, u32 val)
+{
+	u8 regvals[4];
+	int i;
+
+	for (i = 0; i < reg_len; i++)
+		regvals[reg_len - i - 1] = (val >> (i * 8)) & 0xFF;
+
+	return regmap_bulk_write(st->regmap, addr, regvals, reg_len);
+}
+
+static umode_t ltc2992_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr,
+				  int channel)
+{
+	const struct ltc2992_state *st = data;
+
+	switch (type) {
+	case hwmon_in:
+		switch (attr) {
+		case hwmon_in_input:
+		case hwmon_in_min:
+		case hwmon_in_max:
+		case hwmon_in_alarm:
+			return 0444;
+		case hwmon_in_min_alarm:
+		case hwmon_in_max_alarm:
+			return 0644;
+		}
+		break;
+	case hwmon_curr:
+		switch (attr) {
+		case hwmon_curr_input:
+		case hwmon_curr_min:
+		case hwmon_curr_max:
+		case hwmon_curr_alarm:
+			if (st->r_sense_uohm[channel])
+				return 0444;
+			break;
+		case hwmon_curr_min_alarm:
+		case hwmon_curr_max_alarm:
+			if (st->r_sense_uohm[channel])
+				return 0644;
+			break;
+		}
+		break;
+	case hwmon_power:
+		switch (attr) {
+		case hwmon_power_input:
+		case hwmon_power_min:
+		case hwmon_power_max:
+		case hwmon_power_alarm:
+			if (st->r_sense_uohm[channel])
+				return 0444;
+			break;
+		case hwmon_power_min_alarm:
+		case hwmon_power_max_alarm:
+			if (st->r_sense_uohm[channel])
+				return 0644;
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int ltc2992_get_voltage(struct ltc2992_state *st, u32 reg, u32 scale, long *val)
+{
+	u32 reg_val;
+	int ret;
+
+	ret = ltc2992_read_reg(st, reg, 2, &reg_val);
+	if (ret < 0)
+		return ret;
+
+	reg_val = reg_val >> 4;
+	*val = DIV_ROUND_CLOSEST(reg_val * scale, 1000);
+
+	return 0;
+}
+
+static int ltc2992_set_voltage(struct ltc2992_state *st, u32 reg, u32 scale, long val)
+{
+	val = DIV_ROUND_CLOSEST(val * 1000, scale);
+	val = val << 4;
+
+	return ltc2992_write_reg(st, reg, 2, val);
+}
+
+static int ltc2992_read_gpio_alarm(struct ltc2992_state *st, int nr_gpio, long *val)
+{
+	u32 reg_val;
+	int ret;
+
+	ret = ltc2992_read_reg(st, ltc2992_gpio_addr_map[nr_gpio].alarm, 1, &reg_val);
+	if (ret < 0)
+		return ret;
+
+	*val = !!(reg_val & ltc2992_gpio_addr_map[nr_gpio].alarm_msk);
+
+	reg_val &= ~ltc2992_gpio_addr_map[nr_gpio].alarm_msk;
+	return ltc2992_write_reg(st, ltc2992_gpio_addr_map[nr_gpio].alarm, 1, reg_val);
+}
+
+static int ltc2992_read_gpios_in(struct device *dev, u32 attr, int nr_gpio, long *val)
+{
+	struct ltc2992_state *st = dev_get_drvdata(dev);
+	u32 reg;
+
+	switch (attr) {
+	case hwmon_in_input:
+		reg = ltc2992_gpio_addr_map[nr_gpio].data;
+		break;
+	case hwmon_in_min:
+		reg = ltc2992_gpio_addr_map[nr_gpio].min;
+		break;
+	case hwmon_in_max:
+		reg = ltc2992_gpio_addr_map[nr_gpio].max;
+		break;
+	case hwmon_in_min_alarm:
+		reg = ltc2992_gpio_addr_map[nr_gpio].min_thresh;
+		break;
+	case hwmon_in_max_alarm:
+		reg = ltc2992_gpio_addr_map[nr_gpio].max_thresh;
+		break;
+	case hwmon_in_alarm:
+		return ltc2992_read_gpio_alarm(st, nr_gpio, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return ltc2992_get_voltage(st, reg, LTC2992_VADC_GPIO_UV_LSB, val);
+}
+
+static int ltc2992_read_in(struct device *dev, u32 attr, int channel, long *val)
+{
+	struct ltc2992_state *st = dev_get_drvdata(dev);
+	u32 reg_val;
+	u32 reg;
+	int ret;
+
+	if (channel > 1)
+		return ltc2992_read_gpios_in(dev, attr, channel - 2, val);
+
+	switch (attr) {
+	case hwmon_in_input:
+		reg = LTC2992_SENSE(channel);
+		break;
+	case hwmon_in_min:
+		reg = LTC2992_SENSE_MIN(channel);
+		break;
+	case hwmon_in_max:
+		reg = LTC2992_SENSE_MAX(channel);
+		break;
+	case hwmon_in_min_alarm:
+		reg = LTC2992_SENSE_MIN_THRESH(channel);
+		break;
+	case hwmon_in_max_alarm:
+		reg = LTC2992_SENSE_MAX_THRESH(channel);
+		break;
+	case hwmon_in_alarm:
+		ret = ltc2992_read_reg(st, LTC2992_SENSE_FAULT(channel), 1, &reg_val);
+		if (ret < 0)
+			return ret;
+
+		*val = !!(reg_val & LTC2992_SENSE_FAULT_MSK);
+
+		reg_val &= ~LTC2992_SENSE_FAULT_MSK;
+		return ltc2992_write_reg(st, LTC2992_SENSE_FAULT(channel), 1, reg_val);
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return ltc2992_get_voltage(st, reg, LTC2992_VADC_UV_LSB, val);
+}
+
+static int ltc2992_get_current(struct ltc2992_state *st, u32 reg, u32 channel, long *val)
+{
+	u32 reg_val;
+	int ret;
+
+	ret = ltc2992_read_reg(st, reg, 2, &reg_val);
+	if (ret < 0)
+		return ret;
+
+	reg_val = reg_val >> 4;
+	*val = DIV_ROUND_CLOSEST(reg_val * LTC2992_IADC_NANOV_LSB, st->r_sense_uohm[channel]);
+
+	return 0;
+}
+
+static int ltc2992_set_current(struct ltc2992_state *st, u32 reg, u32 channel, long val)
+{
+	u32 reg_val;
+
+	reg_val = DIV_ROUND_CLOSEST(val * st->r_sense_uohm[channel], LTC2992_IADC_NANOV_LSB);
+	reg_val = reg_val << 4;
+
+	return ltc2992_write_reg(st, reg, 2, reg_val);
+}
+
+static int ltc2992_read_curr(struct device *dev, u32 attr, int channel, long *val)
+{
+	struct ltc2992_state *st = dev_get_drvdata(dev);
+	u32 reg_val;
+	u32 reg;
+	int ret;
+
+	switch (attr) {
+	case hwmon_curr_input:
+		reg = LTC2992_DSENSE(channel);
+		break;
+	case hwmon_curr_min:
+		reg = LTC2992_DSENSE_MIN(channel);
+		break;
+	case hwmon_curr_max:
+		reg = LTC2992_DSENSE_MAX(channel);
+		break;
+	case hwmon_curr_min_alarm:
+		reg = LTC2992_DSENSE_MIN_THRESH(channel);
+		break;
+	case hwmon_curr_max_alarm:
+		reg = LTC2992_DSENSE_MAX_THRESH(channel);
+		break;
+	case hwmon_curr_alarm:
+		ret = ltc2992_read_reg(st, LTC2992_DSENSE_FAULT(channel), 1, &reg_val);
+		if (ret < 0)
+			return ret;
+
+		*val = !!(reg_val & LTC2992_DSENSE_FAULT_MSK);
+
+		reg_val &= ~LTC2992_DSENSE_FAULT_MSK;
+		return ltc2992_write_reg(st, LTC2992_DSENSE_FAULT(channel), 1, reg_val);
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return ltc2992_get_current(st, reg, channel, val);
+}
+
+static int ltc2992_get_power(struct ltc2992_state *st, u32 reg, u32 channel, long *val)
+{
+	u32 reg_val;
+	int ret;
+
+	ret = ltc2992_read_reg(st, reg, 3, &reg_val);
+	if (ret < 0)
+		return ret;
+
+	*val = mul_u64_u32_div(reg_val, LTC2992_VADC_UV_LSB * LTC2992_IADC_NANOV_LSB,
+			       st->r_sense_uohm[channel] * 1000);
+
+	return 0;
+}
+
+static int ltc2992_set_power(struct ltc2992_state *st, u32 reg, u32 channel, long val)
+{
+	u32 reg_val;
+
+	reg_val = mul_u64_u32_div(val, st->r_sense_uohm[channel] * 1000,
+				  LTC2992_VADC_UV_LSB * LTC2992_IADC_NANOV_LSB);
+
+	return ltc2992_write_reg(st, reg, 3, reg_val);
+}
+
+static int ltc2992_read_power(struct device *dev, u32 attr, int channel, long *val)
+{
+	struct ltc2992_state *st = dev_get_drvdata(dev);
+	u32 reg_val;
+	u32 reg;
+	int ret;
+
+	switch (attr) {
+	case hwmon_power_input:
+		reg = LTC2992_POWER(channel);
+		break;
+	case hwmon_power_min:
+		reg = LTC2992_POWER_MIN(channel);
+		break;
+	case hwmon_power_max:
+		reg = LTC2992_POWER_MAX(channel);
+		break;
+	case hwmon_power_min_alarm:
+		reg = LTC2992_POWER_MIN_THRESH(channel);
+		break;
+	case hwmon_power_max_alarm:
+		reg = LTC2992_POWER_MAX_THRESH(channel);
+		break;
+	case hwmon_power_alarm:
+		ret = ltc2992_read_reg(st, LTC2992_POWER_FAULT(channel), 1, &reg_val);
+		if (ret < 0)
+			return ret;
+
+		*val = !!(reg_val & LTC2992_POWER_FAULT_MSK);
+
+		reg_val &= ~LTC2992_POWER_FAULT_MSK;
+		return ltc2992_write_reg(st, LTC2992_POWER_FAULT(channel), 1, reg_val);
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return ltc2992_get_power(st, reg, channel, val);
+}
+
+static int ltc2992_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
+			long *val)
+{
+	switch (type) {
+	case hwmon_in:
+		return ltc2992_read_in(dev, attr, channel, val);
+	case hwmon_curr:
+		return ltc2992_read_curr(dev, attr, channel, val);
+	case hwmon_power:
+		return ltc2992_read_power(dev, attr, channel, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int ltc2992_write_curr(struct device *dev, u32 attr, int channel, long val)
+{
+	struct ltc2992_state *st = dev_get_drvdata(dev);
+	u32 reg = 0;
+
+	switch (attr) {
+	case hwmon_curr_min_alarm:
+		reg = LTC2992_DSENSE_MIN_THRESH(channel);
+		break;
+	case hwmon_curr_max_alarm:
+		reg = LTC2992_DSENSE_MAX_THRESH(channel);
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return ltc2992_set_current(st, reg, channel, val);
+}
+
+static int ltc2992_write_gpios_in(struct device *dev, u32 attr, int nr_gpio, long val)
+{
+	struct ltc2992_state *st = dev_get_drvdata(dev);
+	u32 reg;
+
+	switch (attr) {
+	case hwmon_in_min_alarm:
+		reg = ltc2992_gpio_addr_map[nr_gpio].min_thresh;
+		break;
+	case hwmon_in_max_alarm:
+		reg = ltc2992_gpio_addr_map[nr_gpio].max_thresh;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return ltc2992_set_voltage(st, reg, LTC2992_VADC_GPIO_UV_LSB, val);
+}
+
+static int ltc2992_write_in(struct device *dev, u32 attr, int channel, long val)
+{
+	struct ltc2992_state *st = dev_get_drvdata(dev);
+	u32 reg = 0;
+
+	if (channel > 1)
+		return ltc2992_write_gpios_in(dev, attr, channel - 2, val);
+
+	switch (attr) {
+	case hwmon_curr_min_alarm:
+		reg = LTC2992_SENSE_MIN_THRESH(channel);
+		break;
+	case hwmon_curr_max_alarm:
+		reg = LTC2992_SENSE_MAX_THRESH(channel);
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return ltc2992_set_voltage(st, reg, LTC2992_VADC_UV_LSB, val);
+}
+
+static int ltc2992_write_power(struct device *dev, u32 attr, int channel, long val)
+{
+	struct ltc2992_state *st = dev_get_drvdata(dev);
+	u32 reg = 0;
+
+	switch (attr) {
+	case hwmon_power_min_alarm:
+		reg = LTC2992_POWER_MIN_THRESH(channel);
+		break;
+	case hwmon_power_max_alarm:
+		reg = LTC2992_POWER_MAX_THRESH(channel);
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return ltc2992_set_power(st, reg, channel, val);
+}
+
+static int ltc2992_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
+			 long val)
+{
+	switch (type) {
+	case hwmon_in:
+		return ltc2992_write_in(dev, attr, channel, val);
+	case hwmon_curr:
+		return ltc2992_write_curr(dev, attr, channel, val);
+	case hwmon_power:
+		return ltc2992_write_power(dev, attr, channel, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static const struct hwmon_ops ltc2992_hwmon_ops = {
+	.is_visible = ltc2992_is_visible,
+	.read = ltc2992_read,
+	.write = ltc2992_write,
+};
+
+static const u32 ltc2992_in_config[] = {
+	HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_MIN_ALARM |
+	HWMON_I_MAX_ALARM | HWMON_I_ALARM,
+	HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_MIN_ALARM |
+	HWMON_I_MAX_ALARM | HWMON_I_ALARM,
+	HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_MIN_ALARM |
+	HWMON_I_MAX_ALARM | HWMON_I_ALARM,
+	HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_MIN_ALARM |
+	HWMON_I_MAX_ALARM | HWMON_I_ALARM,
+	HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_MIN_ALARM |
+	HWMON_I_MAX_ALARM | HWMON_I_ALARM,
+	HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_MIN_ALARM |
+	HWMON_I_MAX_ALARM | HWMON_I_ALARM,
+	0
+};
+
+static const struct hwmon_channel_info ltc2992_in = {
+	.type = hwmon_in,
+	.config = ltc2992_in_config,
+};
+
+static const u32 ltc2992_curr_config[] = {
+	HWMON_C_INPUT | HWMON_C_MIN | HWMON_C_MAX | HWMON_C_MIN_ALARM | HWMON_C_MAX_ALARM |
+	HWMON_C_ALARM,
+	HWMON_C_INPUT | HWMON_C_MIN | HWMON_C_MAX | HWMON_C_MIN_ALARM | HWMON_C_MAX_ALARM |
+	HWMON_C_ALARM,
+	0
+};
+
+static const struct hwmon_channel_info ltc2992_curr = {
+	.type = hwmon_curr,
+	.config = ltc2992_curr_config,
+};
+
+static const u32 ltc2992_power_config[] = {
+	HWMON_P_INPUT | HWMON_P_MIN | HWMON_P_MAX | HWMON_P_MIN_ALARM | HWMON_P_MAX_ALARM |
+	HWMON_P_ALARM,
+	HWMON_P_INPUT | HWMON_P_MIN | HWMON_P_MAX | HWMON_P_MIN_ALARM | HWMON_P_MAX_ALARM |
+	HWMON_P_ALARM,
+	0
+};
+
+static const struct hwmon_channel_info ltc2992_power = {
+	.type = hwmon_power,
+	.config = ltc2992_power_config,
+};
+
+static const struct hwmon_channel_info *ltc2992_info[] = {
+	&ltc2992_in,
+	&ltc2992_curr,
+	&ltc2992_power,
+	NULL
+};
+
+static const struct hwmon_chip_info ltc2992_chip_info = {
+	.ops = &ltc2992_hwmon_ops,
+	.info = ltc2992_info,
+};
+
+static const struct regmap_config ltc2992_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 0xE8,
+};
+
+static int ltc2992_parse_dt(struct ltc2992_state *st)
+{
+	struct fwnode_handle *fwnode;
+	struct fwnode_handle *child;
+	u32 addr;
+	u32 val;
+	int ret;
+
+	fwnode = dev_fwnode(&st->client->dev);
+
+	fwnode_for_each_available_child_node(fwnode, child) {
+		ret = fwnode_property_read_u32(child, "reg", &addr);
+		if (ret < 0)
+			return ret;
+
+		if (addr > 1)
+			return -EINVAL;
+
+		ret = fwnode_property_read_u32(child, "shunt-resistor-micro-ohms", &val);
+		if (!ret)
+			st->r_sense_uohm[addr] = val;
+	}
+
+	return 0;
+}
+
+static int ltc2992_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+	struct device *hwmon_dev;
+	struct ltc2992_state *st;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		return -ENODEV;
+
+	st = devm_kzalloc(&client->dev, sizeof(*st), GFP_KERNEL);
+	if (!st)
+		return -ENOMEM;
+
+	st->client = client;
+	st->regmap = devm_regmap_init_i2c(client, &ltc2992_regmap_config);
+	if (IS_ERR(st->regmap))
+		return PTR_ERR(st->regmap);
+
+	ret = ltc2992_parse_dt(st);
+	if (ret < 0)
+		return ret;
+
+	hwmon_dev = devm_hwmon_device_register_with_info(&client->dev, client->name, st,
+							 &ltc2992_chip_info, NULL);
+
+	return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct of_device_id ltc2992_of_match[] = {
+	{ .compatible = "adi,ltc2992" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ltc2992_of_match);
+
+static const struct i2c_device_id ltc2992_i2c_id[] = {
+	{"ltc2992", 0},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, ltc2992_i2c_id);
+
+static struct i2c_driver ltc2992_i2c_driver = {
+	.driver = {
+		.name = "ltc2992",
+		.of_match_table = ltc2992_of_match,
+	},
+	.probe    = ltc2992_i2c_probe,
+	.id_table = ltc2992_i2c_id,
+};
+
+module_i2c_driver(ltc2992_i2c_driver);
+
+MODULE_AUTHOR("Alexandru Tachici <alexandru.tachici@...log.com>");
+MODULE_DESCRIPTION("Hwmon driver for Linear Technology 2992");
+MODULE_LICENSE("Dual BSD/GPL");
-- 
2.20.1

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