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-rw-r--r--drivers/hwmon/ltc2992.c939
1 files changed, 939 insertions, 0 deletions
diff --git a/drivers/hwmon/ltc2992.c b/drivers/hwmon/ltc2992.c
new file mode 100644
index 000000000..d88e883c7
--- /dev/null
+++ b/drivers/hwmon/ltc2992.c
@@ -0,0 +1,939 @@
+// 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/err.h>
+#include <linux/gpio/driver.h>
+#include <linux/hwmon.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_GPIO_STATUS 0x95
+#define LTC2992_GPIO_IO_CTRL 0x96
+#define LTC2992_GPIO_CTRL 0x97
+
+#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))
+
+/* CTRLB register bitfields */
+#define LTC2992_RESET_HISTORY BIT(3)
+
+/* FAULT1 FAULT2 registers common bitfields */
+#define LTC2992_POWER_FAULT_MSK(x) (BIT(6) << (x))
+#define LTC2992_DSENSE_FAULT_MSK(x) (BIT(4) << (x))
+#define LTC2992_SENSE_FAULT_MSK(x) (BIT(2) << (x))
+
+/* FAULT1 bitfields */
+#define LTC2992_GPIO1_FAULT_MSK(x) (BIT(0) << (x))
+
+/* FAULT2 bitfields */
+#define LTC2992_GPIO2_FAULT_MSK(x) (BIT(0) << (x))
+
+/* FAULT3 bitfields */
+#define LTC2992_GPIO3_FAULT_MSK(x) (BIT(6) << (x))
+#define LTC2992_GPIO4_FAULT_MSK(x) (BIT(4) << (x))
+
+#define LTC2992_IADC_NANOV_LSB 12500
+#define LTC2992_VADC_UV_LSB 25000
+#define LTC2992_VADC_GPIO_UV_LSB 500
+
+#define LTC2992_GPIO_NR 4
+#define LTC2992_GPIO1_BIT 7
+#define LTC2992_GPIO2_BIT 6
+#define LTC2992_GPIO3_BIT 0
+#define LTC2992_GPIO4_BIT 6
+#define LTC2992_GPIO_BIT(x) (LTC2992_GPIO_NR - (x) - 1)
+
+struct ltc2992_state {
+ struct i2c_client *client;
+ struct gpio_chip gc;
+ struct mutex gpio_mutex; /* lock for gpio access */
+ const char *gpio_names[LTC2992_GPIO_NR];
+ 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 min_alarm_msk;
+ u8 max_alarm_msk;
+ u8 ctrl;
+ u8 ctrl_bit;
+};
+
+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,
+ .min_alarm_msk = LTC2992_GPIO1_FAULT_MSK(0),
+ .max_alarm_msk = LTC2992_GPIO1_FAULT_MSK(1),
+ .ctrl = LTC2992_GPIO_IO_CTRL,
+ .ctrl_bit = LTC2992_GPIO1_BIT,
+ },
+ {
+ .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,
+ .min_alarm_msk = LTC2992_GPIO2_FAULT_MSK(0),
+ .max_alarm_msk = LTC2992_GPIO2_FAULT_MSK(1),
+ .ctrl = LTC2992_GPIO_IO_CTRL,
+ .ctrl_bit = LTC2992_GPIO2_BIT,
+ },
+ {
+ .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,
+ .min_alarm_msk = LTC2992_GPIO3_FAULT_MSK(0),
+ .max_alarm_msk = LTC2992_GPIO3_FAULT_MSK(1),
+ .ctrl = LTC2992_GPIO_IO_CTRL,
+ .ctrl_bit = LTC2992_GPIO3_BIT,
+ },
+ {
+ .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,
+ .min_alarm_msk = LTC2992_GPIO4_FAULT_MSK(0),
+ .max_alarm_msk = LTC2992_GPIO4_FAULT_MSK(1),
+ .ctrl = LTC2992_GPIO_CTRL,
+ .ctrl_bit = LTC2992_GPIO4_BIT,
+ },
+};
+
+static const char *ltc2992_gpio_names[LTC2992_GPIO_NR] = {
+ "GPIO1", "GPIO2", "GPIO3", "GPIO4",
+};
+
+static int ltc2992_read_reg(struct ltc2992_state *st, u8 addr, const u8 reg_len)
+{
+ u8 regvals[4];
+ int val;
+ 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 val;
+}
+
+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 int ltc2992_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct ltc2992_state *st = gpiochip_get_data(chip);
+ unsigned long gpio_status;
+ int reg;
+
+ mutex_lock(&st->gpio_mutex);
+ reg = ltc2992_read_reg(st, LTC2992_GPIO_STATUS, 1);
+ mutex_unlock(&st->gpio_mutex);
+
+ if (reg < 0)
+ return reg;
+
+ gpio_status = reg;
+
+ return !test_bit(LTC2992_GPIO_BIT(offset), &gpio_status);
+}
+
+static int ltc2992_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
+ unsigned long *bits)
+{
+ struct ltc2992_state *st = gpiochip_get_data(chip);
+ unsigned long gpio_status;
+ unsigned int gpio_nr;
+ int reg;
+
+ mutex_lock(&st->gpio_mutex);
+ reg = ltc2992_read_reg(st, LTC2992_GPIO_STATUS, 1);
+ mutex_unlock(&st->gpio_mutex);
+
+ if (reg < 0)
+ return reg;
+
+ gpio_status = reg;
+
+ for_each_set_bit(gpio_nr, mask, LTC2992_GPIO_NR) {
+ if (test_bit(LTC2992_GPIO_BIT(gpio_nr), &gpio_status))
+ set_bit(gpio_nr, bits);
+ }
+
+ return 0;
+}
+
+static void ltc2992_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
+{
+ struct ltc2992_state *st = gpiochip_get_data(chip);
+ unsigned long gpio_ctrl;
+ int reg;
+
+ mutex_lock(&st->gpio_mutex);
+ reg = ltc2992_read_reg(st, ltc2992_gpio_addr_map[offset].ctrl, 1);
+ if (reg < 0) {
+ mutex_unlock(&st->gpio_mutex);
+ return;
+ }
+
+ gpio_ctrl = reg;
+ assign_bit(ltc2992_gpio_addr_map[offset].ctrl_bit, &gpio_ctrl, value);
+
+ ltc2992_write_reg(st, ltc2992_gpio_addr_map[offset].ctrl, 1, gpio_ctrl);
+ mutex_unlock(&st->gpio_mutex);
+}
+
+static void ltc2992_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask,
+ unsigned long *bits)
+{
+ struct ltc2992_state *st = gpiochip_get_data(chip);
+ unsigned long gpio_ctrl_io = 0;
+ unsigned long gpio_ctrl = 0;
+ unsigned int gpio_nr;
+
+ for_each_set_bit(gpio_nr, mask, LTC2992_GPIO_NR) {
+ if (gpio_nr < 3)
+ assign_bit(ltc2992_gpio_addr_map[gpio_nr].ctrl_bit, &gpio_ctrl_io, true);
+
+ if (gpio_nr == 3)
+ assign_bit(ltc2992_gpio_addr_map[gpio_nr].ctrl_bit, &gpio_ctrl, true);
+ }
+
+ mutex_lock(&st->gpio_mutex);
+ ltc2992_write_reg(st, LTC2992_GPIO_IO_CTRL, 1, gpio_ctrl_io);
+ ltc2992_write_reg(st, LTC2992_GPIO_CTRL, 1, gpio_ctrl);
+ mutex_unlock(&st->gpio_mutex);
+}
+
+static int ltc2992_config_gpio(struct ltc2992_state *st)
+{
+ const char *name = dev_name(&st->client->dev);
+ char *gpio_name;
+ int ret;
+ int i;
+
+ ret = ltc2992_write_reg(st, LTC2992_GPIO_IO_CTRL, 1, 0);
+ if (ret < 0)
+ return ret;
+
+ mutex_init(&st->gpio_mutex);
+
+ for (i = 0; i < ARRAY_SIZE(st->gpio_names); i++) {
+ gpio_name = devm_kasprintf(&st->client->dev, GFP_KERNEL, "ltc2992-%x-%s",
+ st->client->addr, ltc2992_gpio_names[i]);
+ if (!gpio_name)
+ return -ENOMEM;
+
+ st->gpio_names[i] = gpio_name;
+ }
+
+ st->gc.label = name;
+ st->gc.parent = &st->client->dev;
+ st->gc.owner = THIS_MODULE;
+ st->gc.can_sleep = true;
+ st->gc.base = -1;
+ st->gc.names = st->gpio_names;
+ st->gc.ngpio = ARRAY_SIZE(st->gpio_names);
+ st->gc.get = ltc2992_gpio_get;
+ st->gc.get_multiple = ltc2992_gpio_get_multiple;
+ st->gc.set = ltc2992_gpio_set;
+ st->gc.set_multiple = ltc2992_gpio_set_multiple;
+
+ ret = devm_gpiochip_add_data(&st->client->dev, &st->gc, st);
+ if (ret)
+ dev_err(&st->client->dev, "GPIO registering failed (%d)\n", ret);
+
+ return ret;
+}
+
+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_chip:
+ switch (attr) {
+ case hwmon_chip_in_reset_history:
+ return 0200;
+ }
+ break;
+ case hwmon_in:
+ switch (attr) {
+ case hwmon_in_input:
+ case hwmon_in_lowest:
+ case hwmon_in_highest:
+ case hwmon_in_min_alarm:
+ case hwmon_in_max_alarm:
+ return 0444;
+ case hwmon_in_min:
+ case hwmon_in_max:
+ return 0644;
+ }
+ break;
+ case hwmon_curr:
+ switch (attr) {
+ case hwmon_curr_input:
+ case hwmon_curr_lowest:
+ case hwmon_curr_highest:
+ case hwmon_curr_min_alarm:
+ case hwmon_curr_max_alarm:
+ if (st->r_sense_uohm[channel])
+ return 0444;
+ break;
+ case hwmon_curr_min:
+ case hwmon_curr_max:
+ if (st->r_sense_uohm[channel])
+ return 0644;
+ break;
+ }
+ break;
+ case hwmon_power:
+ switch (attr) {
+ case hwmon_power_input:
+ case hwmon_power_input_lowest:
+ case hwmon_power_input_highest:
+ case hwmon_power_min_alarm:
+ case hwmon_power_max_alarm:
+ if (st->r_sense_uohm[channel])
+ return 0444;
+ break;
+ case hwmon_power_min:
+ case hwmon_power_max:
+ 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)
+{
+ int reg_val;
+
+ reg_val = ltc2992_read_reg(st, reg, 2);
+ if (reg_val < 0)
+ return reg_val;
+
+ 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, u32 attr, long *val)
+{
+ int reg_val;
+ u32 mask;
+
+ if (attr == hwmon_in_max_alarm)
+ mask = ltc2992_gpio_addr_map[nr_gpio].max_alarm_msk;
+ else
+ mask = ltc2992_gpio_addr_map[nr_gpio].min_alarm_msk;
+
+ reg_val = ltc2992_read_reg(st, ltc2992_gpio_addr_map[nr_gpio].alarm, 1);
+ if (reg_val < 0)
+ return reg_val;
+
+ *val = !!(reg_val & mask);
+ reg_val &= ~mask;
+
+ 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_lowest:
+ reg = ltc2992_gpio_addr_map[nr_gpio].min;
+ break;
+ case hwmon_in_highest:
+ reg = ltc2992_gpio_addr_map[nr_gpio].max;
+ break;
+ case hwmon_in_min:
+ reg = ltc2992_gpio_addr_map[nr_gpio].min_thresh;
+ break;
+ case hwmon_in_max:
+ reg = ltc2992_gpio_addr_map[nr_gpio].max_thresh;
+ break;
+ case hwmon_in_min_alarm:
+ case hwmon_in_max_alarm:
+ return ltc2992_read_gpio_alarm(st, nr_gpio, attr, val);
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ return ltc2992_get_voltage(st, reg, LTC2992_VADC_GPIO_UV_LSB, val);
+}
+
+static int ltc2992_read_in_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr)
+{
+ int reg_val;
+ u32 mask;
+
+ if (attr == hwmon_in_max_alarm)
+ mask = LTC2992_SENSE_FAULT_MSK(1);
+ else
+ mask = LTC2992_SENSE_FAULT_MSK(0);
+
+ reg_val = ltc2992_read_reg(st, LTC2992_SENSE_FAULT(channel), 1);
+ if (reg_val < 0)
+ return reg_val;
+
+ *val = !!(reg_val & mask);
+ reg_val &= ~mask;
+
+ return ltc2992_write_reg(st, LTC2992_SENSE_FAULT(channel), 1, reg_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;
+
+ 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_lowest:
+ reg = LTC2992_SENSE_MIN(channel);
+ break;
+ case hwmon_in_highest:
+ reg = LTC2992_SENSE_MAX(channel);
+ break;
+ case hwmon_in_min:
+ reg = LTC2992_SENSE_MIN_THRESH(channel);
+ break;
+ case hwmon_in_max:
+ reg = LTC2992_SENSE_MAX_THRESH(channel);
+ break;
+ case hwmon_in_min_alarm:
+ case hwmon_in_max_alarm:
+ return ltc2992_read_in_alarm(st, channel, val, attr);
+ 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)
+{
+ int reg_val;
+
+ reg_val = ltc2992_read_reg(st, reg, 2);
+ if (reg_val < 0)
+ return reg_val;
+
+ 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_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr)
+{
+ int reg_val;
+ u32 mask;
+
+ if (attr == hwmon_curr_max_alarm)
+ mask = LTC2992_DSENSE_FAULT_MSK(1);
+ else
+ mask = LTC2992_DSENSE_FAULT_MSK(0);
+
+ reg_val = ltc2992_read_reg(st, LTC2992_DSENSE_FAULT(channel), 1);
+ if (reg_val < 0)
+ return reg_val;
+
+ *val = !!(reg_val & mask);
+
+ reg_val &= ~mask;
+ return ltc2992_write_reg(st, LTC2992_DSENSE_FAULT(channel), 1, 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;
+
+ switch (attr) {
+ case hwmon_curr_input:
+ reg = LTC2992_DSENSE(channel);
+ break;
+ case hwmon_curr_lowest:
+ reg = LTC2992_DSENSE_MIN(channel);
+ break;
+ case hwmon_curr_highest:
+ reg = LTC2992_DSENSE_MAX(channel);
+ break;
+ case hwmon_curr_min:
+ reg = LTC2992_DSENSE_MIN_THRESH(channel);
+ break;
+ case hwmon_curr_max:
+ reg = LTC2992_DSENSE_MAX_THRESH(channel);
+ break;
+ case hwmon_curr_min_alarm:
+ case hwmon_curr_max_alarm:
+ return ltc2992_read_curr_alarm(st, channel, val, attr);
+ 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)
+{
+ int reg_val;
+
+ reg_val = ltc2992_read_reg(st, reg, 3);
+ if (reg_val < 0)
+ return reg_val;
+
+ *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_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr)
+{
+ int reg_val;
+ u32 mask;
+
+ if (attr == hwmon_power_max_alarm)
+ mask = LTC2992_POWER_FAULT_MSK(1);
+ else
+ mask = LTC2992_POWER_FAULT_MSK(0);
+
+ reg_val = ltc2992_read_reg(st, LTC2992_POWER_FAULT(channel), 1);
+ if (reg_val < 0)
+ return reg_val;
+
+ *val = !!(reg_val & mask);
+ reg_val &= ~mask;
+
+ return ltc2992_write_reg(st, LTC2992_POWER_FAULT(channel), 1, 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;
+
+ switch (attr) {
+ case hwmon_power_input:
+ reg = LTC2992_POWER(channel);
+ break;
+ case hwmon_power_input_lowest:
+ reg = LTC2992_POWER_MIN(channel);
+ break;
+ case hwmon_power_input_highest:
+ reg = LTC2992_POWER_MAX(channel);
+ break;
+ case hwmon_power_min:
+ reg = LTC2992_POWER_MIN_THRESH(channel);
+ break;
+ case hwmon_power_max:
+ reg = LTC2992_POWER_MAX_THRESH(channel);
+ break;
+ case hwmon_power_min_alarm:
+ case hwmon_power_max_alarm:
+ return ltc2992_read_power_alarm(st, channel, val, attr);
+ 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;
+
+ switch (attr) {
+ case hwmon_curr_min:
+ reg = LTC2992_DSENSE_MIN_THRESH(channel);
+ break;
+ case hwmon_curr_max:
+ 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:
+ reg = ltc2992_gpio_addr_map[nr_gpio].min_thresh;
+ break;
+ case hwmon_in_max:
+ 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;
+
+ if (channel > 1)
+ return ltc2992_write_gpios_in(dev, attr, channel - 2, val);
+
+ switch (attr) {
+ case hwmon_in_min:
+ reg = LTC2992_SENSE_MIN_THRESH(channel);
+ break;
+ case hwmon_in_max:
+ 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;
+
+ switch (attr) {
+ case hwmon_power_min:
+ reg = LTC2992_POWER_MIN_THRESH(channel);
+ break;
+ case hwmon_power_max:
+ reg = LTC2992_POWER_MAX_THRESH(channel);
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ return ltc2992_set_power(st, reg, channel, val);
+}
+
+static int ltc2992_write_chip(struct device *dev, u32 attr, int channel, long val)
+{
+ struct ltc2992_state *st = dev_get_drvdata(dev);
+
+ switch (attr) {
+ case hwmon_chip_in_reset_history:
+ return regmap_update_bits(st->regmap, LTC2992_CTRLB, LTC2992_RESET_HISTORY,
+ LTC2992_RESET_HISTORY);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int ltc2992_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
+ long val)
+{
+ switch (type) {
+ case hwmon_chip:
+ return ltc2992_write_chip(dev, attr, channel, val);
+ 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 struct hwmon_channel_info *ltc2992_info[] = {
+ HWMON_CHANNEL_INFO(chip,
+ HWMON_C_IN_RESET_HISTORY),
+ HWMON_CHANNEL_INFO(in,
+ HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
+ HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM,
+ HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
+ HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM,
+ HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
+ HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM,
+ HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
+ HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM,
+ HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
+ HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM,
+ HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
+ HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM),
+ HWMON_CHANNEL_INFO(curr,
+ HWMON_C_INPUT | HWMON_C_LOWEST | HWMON_C_HIGHEST | HWMON_C_MIN |
+ HWMON_C_MAX | HWMON_C_MIN_ALARM | HWMON_C_MAX_ALARM,
+ HWMON_C_INPUT | HWMON_C_LOWEST | HWMON_C_HIGHEST | HWMON_C_MIN |
+ HWMON_C_MAX | HWMON_C_MIN_ALARM | HWMON_C_MAX_ALARM),
+ HWMON_CHANNEL_INFO(power,
+ HWMON_P_INPUT | HWMON_P_INPUT_LOWEST | HWMON_P_INPUT_HIGHEST |
+ HWMON_P_MIN | HWMON_P_MAX | HWMON_P_MIN_ALARM | HWMON_P_MAX_ALARM,
+ HWMON_P_INPUT | HWMON_P_INPUT_LOWEST | HWMON_P_INPUT_HIGHEST |
+ HWMON_P_MIN | HWMON_P_MAX | HWMON_P_MIN_ALARM | HWMON_P_MAX_ALARM),
+ 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) {
+ fwnode_handle_put(child);
+ return ret;
+ }
+
+ if (addr > 1) {
+ fwnode_handle_put(child);
+ 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;
+
+ 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;
+
+ ret = ltc2992_config_gpio(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@analog.com>");
+MODULE_DESCRIPTION("Hwmon driver for Linear Technology 2992");
+MODULE_LICENSE("Dual BSD/GPL");