summaryrefslogtreecommitdiff
path: root/drivers/hwmon/ltc2947-core.c
diff options
context:
space:
mode:
authorNuno Sá <nuno.sa@analog.com>2019-10-21 17:41:14 +0200
committerGuenter Roeck <linux@roeck-us.net>2019-11-06 14:37:19 -0800
commit9f90fd652bed0a7295c13f413ab7b5c19152326c (patch)
tree829db77059ca3c5b1a7743524bee893989277b9d /drivers/hwmon/ltc2947-core.c
parent2057bdfb7184e9833182bf9ffcb234988f545f41 (diff)
hwmon: Add support for ltc2947
The ltc2947 is a high precision power and energy monitor with an internal sense resistor supporting up to +/- 30A. Three internal no Latency ADCs ensure accurate measurement of voltage and current, while high-bandwidth analog multiplication of voltage and current provides accurate power measurement in a wide range of applications. Internal or external clocking options enable precise charge and energy measurements. Signed-off-by: Nuno Sá <nuno.sa@analog.com> Link: https://lore.kernel.org/r/20191021154115.319073-1-nuno.sa@analog.com [groeck: Removed unnecessary checks when reading temperature and energy; PAGE{0,1} -> LTC2947_PAGE_{0,1}] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/ltc2947-core.c')
-rw-r--r--drivers/hwmon/ltc2947-core.c1183
1 files changed, 1183 insertions, 0 deletions
diff --git a/drivers/hwmon/ltc2947-core.c b/drivers/hwmon/ltc2947-core.c
new file mode 100644
index 000000000000..bb3f7749a0b0
--- /dev/null
+++ b/drivers/hwmon/ltc2947-core.c
@@ -0,0 +1,1183 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Analog Devices LTC2947 high precision power and energy monitor
+ *
+ * Copyright 2019 Analog Devices Inc.
+ */
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+
+#include "ltc2947.h"
+
+/* register's */
+#define LTC2947_REG_PAGE_CTRL 0xFF
+#define LTC2947_REG_CTRL 0xF0
+#define LTC2947_REG_TBCTL 0xE9
+#define LTC2947_CONT_MODE_MASK BIT(3)
+#define LTC2947_CONT_MODE(x) FIELD_PREP(LTC2947_CONT_MODE_MASK, x)
+#define LTC2947_PRE_MASK GENMASK(2, 0)
+#define LTC2947_PRE(x) FIELD_PREP(LTC2947_PRE_MASK, x)
+#define LTC2947_DIV_MASK GENMASK(7, 3)
+#define LTC2947_DIV(x) FIELD_PREP(LTC2947_DIV_MASK, x)
+#define LTC2947_SHUTDOWN_MASK BIT(0)
+#define LTC2947_REG_ACCUM_POL 0xE1
+#define LTC2947_ACCUM_POL_1_MASK GENMASK(1, 0)
+#define LTC2947_ACCUM_POL_1(x) FIELD_PREP(LTC2947_ACCUM_POL_1_MASK, x)
+#define LTC2947_ACCUM_POL_2_MASK GENMASK(3, 2)
+#define LTC2947_ACCUM_POL_2(x) FIELD_PREP(LTC2947_ACCUM_POL_2_MASK, x)
+#define LTC2947_REG_ACCUM_DEADBAND 0xE4
+#define LTC2947_REG_GPIOSTATCTL 0x67
+#define LTC2947_GPIO_EN_MASK BIT(0)
+#define LTC2947_GPIO_EN(x) FIELD_PREP(LTC2947_GPIO_EN_MASK, x)
+#define LTC2947_GPIO_FAN_EN_MASK BIT(6)
+#define LTC2947_GPIO_FAN_EN(x) FIELD_PREP(LTC2947_GPIO_FAN_EN_MASK, x)
+#define LTC2947_GPIO_FAN_POL_MASK BIT(7)
+#define LTC2947_GPIO_FAN_POL(x) FIELD_PREP(LTC2947_GPIO_FAN_POL_MASK, x)
+#define LTC2947_REG_GPIO_ACCUM 0xE3
+/* 200Khz */
+#define LTC2947_CLK_MIN 200000
+/* 25Mhz */
+#define LTC2947_CLK_MAX 25000000
+#define LTC2947_PAGE0 0
+#define LTC2947_PAGE1 1
+/* Voltage registers */
+#define LTC2947_REG_VOLTAGE 0xA0
+#define LTC2947_REG_VOLTAGE_MAX 0x50
+#define LTC2947_REG_VOLTAGE_MIN 0x52
+#define LTC2947_REG_VOLTAGE_THRE_H 0x90
+#define LTC2947_REG_VOLTAGE_THRE_L 0x92
+#define LTC2947_REG_DVCC 0xA4
+#define LTC2947_REG_DVCC_MAX 0x58
+#define LTC2947_REG_DVCC_MIN 0x5A
+#define LTC2947_REG_DVCC_THRE_H 0x98
+#define LTC2947_REG_DVCC_THRE_L 0x9A
+#define LTC2947_VOLTAGE_GEN_CHAN 0
+#define LTC2947_VOLTAGE_DVCC_CHAN 1
+/* in mV */
+#define VOLTAGE_MAX 15500
+#define VOLTAGE_MIN -300
+#define VDVCC_MAX 15000
+#define VDVCC_MIN 4750
+/* Current registers */
+#define LTC2947_REG_CURRENT 0x90
+#define LTC2947_REG_CURRENT_MAX 0x40
+#define LTC2947_REG_CURRENT_MIN 0x42
+#define LTC2947_REG_CURRENT_THRE_H 0x80
+#define LTC2947_REG_CURRENT_THRE_L 0x82
+/* in mA */
+#define CURRENT_MAX 30000
+#define CURRENT_MIN -30000
+/* Power registers */
+#define LTC2947_REG_POWER 0x93
+#define LTC2947_REG_POWER_MAX 0x44
+#define LTC2947_REG_POWER_MIN 0x46
+#define LTC2947_REG_POWER_THRE_H 0x84
+#define LTC2947_REG_POWER_THRE_L 0x86
+/* in uW */
+#define POWER_MAX 450000000
+#define POWER_MIN -450000000
+/* Temperature registers */
+#define LTC2947_REG_TEMP 0xA2
+#define LTC2947_REG_TEMP_MAX 0x54
+#define LTC2947_REG_TEMP_MIN 0x56
+#define LTC2947_REG_TEMP_THRE_H 0x94
+#define LTC2947_REG_TEMP_THRE_L 0x96
+#define LTC2947_REG_TEMP_FAN_THRE_H 0x9C
+#define LTC2947_REG_TEMP_FAN_THRE_L 0x9E
+#define LTC2947_TEMP_FAN_CHAN 1
+/* in millidegress Celsius */
+#define TEMP_MAX 85000
+#define TEMP_MIN -40000
+/* Energy registers */
+#define LTC2947_REG_ENERGY1 0x06
+#define LTC2947_REG_ENERGY2 0x16
+/* Status/Alarm/Overflow registers */
+#define LTC2947_REG_STATUS 0x80
+#define LTC2947_REG_STATVT 0x81
+#define LTC2947_REG_STATIP 0x82
+#define LTC2947_REG_STATVDVCC 0x87
+
+#define LTC2947_ALERTS_SIZE (LTC2947_REG_STATVDVCC - LTC2947_REG_STATUS)
+#define LTC2947_MAX_VOLTAGE_MASK BIT(0)
+#define LTC2947_MIN_VOLTAGE_MASK BIT(1)
+#define LTC2947_MAX_CURRENT_MASK BIT(0)
+#define LTC2947_MIN_CURRENT_MASK BIT(1)
+#define LTC2947_MAX_POWER_MASK BIT(2)
+#define LTC2947_MIN_POWER_MASK BIT(3)
+#define LTC2947_MAX_TEMP_MASK BIT(2)
+#define LTC2947_MIN_TEMP_MASK BIT(3)
+#define LTC2947_MAX_TEMP_FAN_MASK BIT(4)
+#define LTC2947_MIN_TEMP_FAN_MASK BIT(5)
+
+struct ltc2947_data {
+ struct regmap *map;
+ struct device *dev;
+ /*
+ * The mutex is needed because the device has 2 memory pages. When
+ * reading/writing the correct page needs to be set so that, the
+ * complete sequence select_page->read/write needs to be protected.
+ */
+ struct mutex lock;
+ u32 lsb_energy;
+ bool gpio_out;
+};
+
+static int __ltc2947_val_read16(const struct ltc2947_data *st, const u8 reg,
+ u64 *val)
+{
+ __be16 __val = 0;
+ int ret;
+
+ ret = regmap_bulk_read(st->map, reg, &__val, 2);
+ if (ret)
+ return ret;
+
+ *val = be16_to_cpu(__val);
+
+ return 0;
+}
+
+static int __ltc2947_val_read24(const struct ltc2947_data *st, const u8 reg,
+ u64 *val)
+{
+ __be32 __val = 0;
+ int ret;
+
+ ret = regmap_bulk_read(st->map, reg, &__val, 3);
+ if (ret)
+ return ret;
+
+ *val = be32_to_cpu(__val) >> 8;
+
+ return 0;
+}
+
+static int __ltc2947_val_read64(const struct ltc2947_data *st, const u8 reg,
+ u64 *val)
+{
+ __be64 __val = 0;
+ int ret;
+
+ ret = regmap_bulk_read(st->map, reg, &__val, 6);
+ if (ret)
+ return ret;
+
+ *val = be64_to_cpu(__val) >> 16;
+
+ return 0;
+}
+
+static int ltc2947_val_read(struct ltc2947_data *st, const u8 reg,
+ const u8 page, const size_t size, s64 *val)
+{
+ int ret;
+ u64 __val = 0;
+
+ mutex_lock(&st->lock);
+
+ ret = regmap_write(st->map, LTC2947_REG_PAGE_CTRL, page);
+ if (ret) {
+ mutex_unlock(&st->lock);
+ return ret;
+ }
+
+ dev_dbg(st->dev, "Read val, reg:%02X, p:%d sz:%zu\n", reg, page,
+ size);
+
+ switch (size) {
+ case 2:
+ ret = __ltc2947_val_read16(st, reg, &__val);
+ break;
+ case 3:
+ ret = __ltc2947_val_read24(st, reg, &__val);
+ break;
+ case 6:
+ ret = __ltc2947_val_read64(st, reg, &__val);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ mutex_unlock(&st->lock);
+
+ if (ret)
+ return ret;
+
+ *val = sign_extend64(__val, (8 * size) - 1);
+
+ dev_dbg(st->dev, "Got s:%lld, u:%016llX\n", *val, __val);
+
+ return 0;
+}
+
+static int __ltc2947_val_write64(const struct ltc2947_data *st, const u8 reg,
+ const u64 val)
+{
+ __be64 __val;
+
+ __val = cpu_to_be64(val << 16);
+ return regmap_bulk_write(st->map, reg, &__val, 6);
+}
+
+static int __ltc2947_val_write16(const struct ltc2947_data *st, const u8 reg,
+ const u16 val)
+{
+ __be16 __val;
+
+ __val = cpu_to_be16(val);
+ return regmap_bulk_write(st->map, reg, &__val, 2);
+}
+
+static int ltc2947_val_write(struct ltc2947_data *st, const u8 reg,
+ const u8 page, const size_t size, const u64 val)
+{
+ int ret;
+
+ mutex_lock(&st->lock);
+ /* set device on correct page */
+ ret = regmap_write(st->map, LTC2947_REG_PAGE_CTRL, page);
+ if (ret) {
+ mutex_unlock(&st->lock);
+ return ret;
+ }
+
+ dev_dbg(st->dev, "Write val, r:%02X, p:%d, sz:%zu, val:%016llX\n",
+ reg, page, size, val);
+
+ switch (size) {
+ case 2:
+ ret = __ltc2947_val_write16(st, reg, val);
+ break;
+ case 6:
+ ret = __ltc2947_val_write64(st, reg, val);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ mutex_unlock(&st->lock);
+
+ return ret;
+}
+
+static int ltc2947_reset_history(struct ltc2947_data *st, const u8 reg_h,
+ const u8 reg_l)
+{
+ int ret;
+ /*
+ * let's reset the tracking register's. Tracking register's have all
+ * 2 bytes size
+ */
+ ret = ltc2947_val_write(st, reg_h, LTC2947_PAGE0, 2, 0x8000U);
+ if (ret)
+ return ret;
+
+ return ltc2947_val_write(st, reg_l, LTC2947_PAGE0, 2, 0x7FFFU);
+}
+
+static int ltc2947_alarm_read(struct ltc2947_data *st, const u8 reg,
+ const u32 mask, long *val)
+{
+ u8 offset = reg - LTC2947_REG_STATUS;
+ /* +1 to include status reg */
+ char alarms[LTC2947_ALERTS_SIZE + 1];
+ int ret = 0;
+
+ memset(alarms, 0, sizeof(alarms));
+
+ mutex_lock(&st->lock);
+
+ ret = regmap_write(st->map, LTC2947_REG_PAGE_CTRL, LTC2947_PAGE0);
+ if (ret)
+ goto unlock;
+
+ dev_dbg(st->dev, "Read alarm, reg:%02X, mask:%02X\n", reg, mask);
+ /*
+ * As stated in the datasheet, when Threshold and Overflow registers
+ * are used, the status and all alert registers must be read in one
+ * multi-byte transaction.
+ */
+ ret = regmap_bulk_read(st->map, LTC2947_REG_STATUS, alarms,
+ sizeof(alarms));
+ if (ret)
+ goto unlock;
+
+ /* get the alarm */
+ *val = !!(alarms[offset] & mask);
+unlock:
+ mutex_unlock(&st->lock);
+ return ret;
+}
+
+static ssize_t ltc2947_show_value(struct device *dev,
+ struct device_attribute *da, char *buf)
+{
+ struct ltc2947_data *st = dev_get_drvdata(dev);
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ int ret;
+ s64 val = 0;
+
+ ret = ltc2947_val_read(st, attr->index, LTC2947_PAGE0, 6, &val);
+ if (ret)
+ return ret;
+
+ /* value in microJoule. st->lsb_energy was multiplied by 10E9 */
+ val = div_s64(val * st->lsb_energy, 1000);
+
+ return sprintf(buf, "%lld\n", val);
+}
+
+static int ltc2947_read_temp(struct device *dev, const u32 attr, long *val,
+ const int channel)
+{
+ int ret;
+ struct ltc2947_data *st = dev_get_drvdata(dev);
+ s64 __val = 0;
+
+ switch (attr) {
+ case hwmon_temp_input:
+ ret = ltc2947_val_read(st, LTC2947_REG_TEMP, LTC2947_PAGE0,
+ 2, &__val);
+ break;
+ case hwmon_temp_highest:
+ ret = ltc2947_val_read(st, LTC2947_REG_TEMP_MAX, LTC2947_PAGE0,
+ 2, &__val);
+ break;
+ case hwmon_temp_lowest:
+ ret = ltc2947_val_read(st, LTC2947_REG_TEMP_MIN, LTC2947_PAGE0,
+ 2, &__val);
+ break;
+ case hwmon_temp_max_alarm:
+ if (channel == LTC2947_TEMP_FAN_CHAN)
+ return ltc2947_alarm_read(st, LTC2947_REG_STATVT,
+ LTC2947_MAX_TEMP_FAN_MASK,
+ val);
+
+ return ltc2947_alarm_read(st, LTC2947_REG_STATVT,
+ LTC2947_MAX_TEMP_MASK, val);
+ case hwmon_temp_min_alarm:
+ if (channel == LTC2947_TEMP_FAN_CHAN)
+ return ltc2947_alarm_read(st, LTC2947_REG_STATVT,
+ LTC2947_MIN_TEMP_FAN_MASK,
+ val);
+
+ return ltc2947_alarm_read(st, LTC2947_REG_STATVT,
+ LTC2947_MIN_TEMP_MASK, val);
+ case hwmon_temp_max:
+ if (channel == LTC2947_TEMP_FAN_CHAN)
+ ret = ltc2947_val_read(st, LTC2947_REG_TEMP_FAN_THRE_H,
+ LTC2947_PAGE1, 2, &__val);
+ else
+ ret = ltc2947_val_read(st, LTC2947_REG_TEMP_THRE_H,
+ LTC2947_PAGE1, 2, &__val);
+ break;
+ case hwmon_temp_min:
+ if (channel == LTC2947_TEMP_FAN_CHAN)
+ ret = ltc2947_val_read(st, LTC2947_REG_TEMP_FAN_THRE_L,
+ LTC2947_PAGE1, 2, &__val);
+ else
+ ret = ltc2947_val_read(st, LTC2947_REG_TEMP_THRE_L,
+ LTC2947_PAGE1, 2, &__val);
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ if (ret)
+ return ret;
+
+ /* in milidegrees celcius, temp is given by: */
+ *val = (__val * 204) + 550;
+
+ return 0;
+}
+
+static int ltc2947_read_power(struct device *dev, const u32 attr, long *val)
+{
+ struct ltc2947_data *st = dev_get_drvdata(dev);
+ int ret;
+ u32 lsb = 200000; /* in uW */
+ s64 __val = 0;
+
+ switch (attr) {
+ case hwmon_power_input:
+ ret = ltc2947_val_read(st, LTC2947_REG_POWER, LTC2947_PAGE0,
+ 3, &__val);
+ lsb = 50000;
+ break;
+ case hwmon_power_input_highest:
+ ret = ltc2947_val_read(st, LTC2947_REG_POWER_MAX, LTC2947_PAGE0,
+ 2, &__val);
+ break;
+ case hwmon_power_input_lowest:
+ ret = ltc2947_val_read(st, LTC2947_REG_POWER_MIN, LTC2947_PAGE0,
+ 2, &__val);
+ break;
+ case hwmon_power_max_alarm:
+ return ltc2947_alarm_read(st, LTC2947_REG_STATIP,
+ LTC2947_MAX_POWER_MASK, val);
+ case hwmon_power_min_alarm:
+ return ltc2947_alarm_read(st, LTC2947_REG_STATIP,
+ LTC2947_MIN_POWER_MASK, val);
+ case hwmon_power_max:
+ ret = ltc2947_val_read(st, LTC2947_REG_POWER_THRE_H,
+ LTC2947_PAGE1, 2, &__val);
+ break;
+ case hwmon_power_min:
+ ret = ltc2947_val_read(st, LTC2947_REG_POWER_THRE_L,
+ LTC2947_PAGE1, 2, &__val);
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ if (ret)
+ return ret;
+
+ *val = __val * lsb;
+
+ return 0;
+}
+
+static int ltc2947_read_curr(struct device *dev, const u32 attr, long *val)
+{
+ struct ltc2947_data *st = dev_get_drvdata(dev);
+ int ret;
+ u8 lsb = 12; /* in mA */
+ s64 __val = 0;
+
+ switch (attr) {
+ case hwmon_curr_input:
+ ret = ltc2947_val_read(st, LTC2947_REG_CURRENT,
+ LTC2947_PAGE0, 3, &__val);
+ lsb = 3;
+ break;
+ case hwmon_curr_highest:
+ ret = ltc2947_val_read(st, LTC2947_REG_CURRENT_MAX,
+ LTC2947_PAGE0, 2, &__val);
+ break;
+ case hwmon_curr_lowest:
+ ret = ltc2947_val_read(st, LTC2947_REG_CURRENT_MIN,
+ LTC2947_PAGE0, 2, &__val);
+ break;
+ case hwmon_curr_max_alarm:
+ return ltc2947_alarm_read(st, LTC2947_REG_STATIP,
+ LTC2947_MAX_CURRENT_MASK, val);
+ case hwmon_curr_min_alarm:
+ return ltc2947_alarm_read(st, LTC2947_REG_STATIP,
+ LTC2947_MIN_CURRENT_MASK, val);
+ case hwmon_curr_max:
+ ret = ltc2947_val_read(st, LTC2947_REG_CURRENT_THRE_H,
+ LTC2947_PAGE1, 2, &__val);
+ break;
+ case hwmon_curr_min:
+ ret = ltc2947_val_read(st, LTC2947_REG_CURRENT_THRE_L,
+ LTC2947_PAGE1, 2, &__val);
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ if (ret)
+ return ret;
+
+ *val = __val * lsb;
+
+ return 0;
+}
+
+static int ltc2947_read_in(struct device *dev, const u32 attr, long *val,
+ const int channel)
+{
+ struct ltc2947_data *st = dev_get_drvdata(dev);
+ int ret;
+ u8 lsb = 2; /* in mV */
+ s64 __val = 0;
+
+ if (channel < 0 || channel > LTC2947_VOLTAGE_DVCC_CHAN) {
+ dev_err(st->dev, "Invalid chan%d for voltage", channel);
+ return -EINVAL;
+ }
+
+ switch (attr) {
+ case hwmon_in_input:
+ if (channel == LTC2947_VOLTAGE_DVCC_CHAN) {
+ ret = ltc2947_val_read(st, LTC2947_REG_DVCC,
+ LTC2947_PAGE0, 2, &__val);
+ lsb = 145;
+ } else {
+ ret = ltc2947_val_read(st, LTC2947_REG_VOLTAGE,
+ LTC2947_PAGE0, 2, &__val);
+ }
+ break;
+ case hwmon_in_highest:
+ if (channel == LTC2947_VOLTAGE_DVCC_CHAN) {
+ ret = ltc2947_val_read(st, LTC2947_REG_DVCC_MAX,
+ LTC2947_PAGE0, 2, &__val);
+ lsb = 145;
+ } else {
+ ret = ltc2947_val_read(st, LTC2947_REG_VOLTAGE_MAX,
+ LTC2947_PAGE0, 2, &__val);
+ }
+ break;
+ case hwmon_in_lowest:
+ if (channel == LTC2947_VOLTAGE_DVCC_CHAN) {
+ ret = ltc2947_val_read(st, LTC2947_REG_DVCC_MIN,
+ LTC2947_PAGE0, 2, &__val);
+ lsb = 145;
+ } else {
+ ret = ltc2947_val_read(st, LTC2947_REG_VOLTAGE_MIN,
+ LTC2947_PAGE0, 2, &__val);
+ }
+ break;
+ case hwmon_in_max_alarm:
+ if (channel == LTC2947_VOLTAGE_DVCC_CHAN)
+ return ltc2947_alarm_read(st, LTC2947_REG_STATVDVCC,
+ LTC2947_MAX_VOLTAGE_MASK,
+ val);
+
+ return ltc2947_alarm_read(st, LTC2947_REG_STATVT,
+ LTC2947_MAX_VOLTAGE_MASK, val);
+ case hwmon_in_min_alarm:
+ if (channel == LTC2947_VOLTAGE_DVCC_CHAN)
+ return ltc2947_alarm_read(st, LTC2947_REG_STATVDVCC,
+ LTC2947_MIN_VOLTAGE_MASK,
+ val);
+
+ return ltc2947_alarm_read(st, LTC2947_REG_STATVT,
+ LTC2947_MIN_VOLTAGE_MASK, val);
+ case hwmon_in_max:
+ if (channel == LTC2947_VOLTAGE_DVCC_CHAN) {
+ ret = ltc2947_val_read(st, LTC2947_REG_DVCC_THRE_H,
+ LTC2947_PAGE1, 2, &__val);
+ lsb = 145;
+ } else {
+ ret = ltc2947_val_read(st, LTC2947_REG_VOLTAGE_THRE_H,
+ LTC2947_PAGE1, 2, &__val);
+ }
+ break;
+ case hwmon_in_min:
+ if (channel == LTC2947_VOLTAGE_DVCC_CHAN) {
+ ret = ltc2947_val_read(st, LTC2947_REG_DVCC_THRE_L,
+ LTC2947_PAGE1, 2, &__val);
+ lsb = 145;
+ } else {
+ ret = ltc2947_val_read(st, LTC2947_REG_VOLTAGE_THRE_L,
+ LTC2947_PAGE1, 2, &__val);
+ }
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ if (ret)
+ return ret;
+
+ *val = __val * lsb;
+
+ return 0;
+}
+
+static int ltc2947_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ switch (type) {
+ case hwmon_in:
+ return ltc2947_read_in(dev, attr, val, channel);
+ case hwmon_curr:
+ return ltc2947_read_curr(dev, attr, val);
+ case hwmon_power:
+ return ltc2947_read_power(dev, attr, val);
+ case hwmon_temp:
+ return ltc2947_read_temp(dev, attr, val, channel);
+ default:
+ return -ENOTSUPP;
+ }
+}
+
+static int ltc2947_write_temp(struct device *dev, const u32 attr,
+ long val, const int channel)
+{
+ struct ltc2947_data *st = dev_get_drvdata(dev);
+
+ if (channel < 0 || channel > LTC2947_TEMP_FAN_CHAN) {
+ dev_err(st->dev, "Invalid chan%d for temperature", channel);
+ return -EINVAL;
+ }
+
+ switch (attr) {
+ case hwmon_temp_reset_history:
+ if (val != 1)
+ return -EINVAL;
+ return ltc2947_reset_history(st, LTC2947_REG_TEMP_MAX,
+ LTC2947_REG_TEMP_MIN);
+ case hwmon_temp_max:
+ val = clamp_val(val, TEMP_MIN, TEMP_MAX);
+ if (channel == LTC2947_TEMP_FAN_CHAN) {
+ if (!st->gpio_out)
+ return -ENOTSUPP;
+
+ return ltc2947_val_write(st,
+ LTC2947_REG_TEMP_FAN_THRE_H,
+ LTC2947_PAGE1, 2,
+ DIV_ROUND_CLOSEST(val - 550, 204));
+ }
+
+ return ltc2947_val_write(st, LTC2947_REG_TEMP_THRE_H,
+ LTC2947_PAGE1, 2,
+ DIV_ROUND_CLOSEST(val - 550, 204));
+ case hwmon_temp_min:
+ val = clamp_val(val, TEMP_MIN, TEMP_MAX);
+ if (channel == LTC2947_TEMP_FAN_CHAN) {
+ if (!st->gpio_out)
+ return -ENOTSUPP;
+
+ return ltc2947_val_write(st,
+ LTC2947_REG_TEMP_FAN_THRE_L,
+ LTC2947_PAGE1, 2,
+ DIV_ROUND_CLOSEST(val - 550, 204));
+ }
+
+ return ltc2947_val_write(st, LTC2947_REG_TEMP_THRE_L,
+ LTC2947_PAGE1, 2,
+ DIV_ROUND_CLOSEST(val - 550, 204));
+ default:
+ return -ENOTSUPP;
+ }
+}
+
+static int ltc2947_write_power(struct device *dev, const u32 attr,
+ long val)
+{
+ struct ltc2947_data *st = dev_get_drvdata(dev);
+
+ switch (attr) {
+ case hwmon_power_reset_history:
+ if (val != 1)
+ return -EINVAL;
+ return ltc2947_reset_history(st, LTC2947_REG_POWER_MAX,
+ LTC2947_REG_POWER_MIN);
+ case hwmon_power_max:
+ val = clamp_val(val, POWER_MIN, POWER_MAX);
+ return ltc2947_val_write(st, LTC2947_REG_POWER_THRE_H,
+ LTC2947_PAGE1, 2,
+ DIV_ROUND_CLOSEST(val, 200000));
+ case hwmon_power_min:
+ val = clamp_val(val, POWER_MIN, POWER_MAX);
+ return ltc2947_val_write(st, LTC2947_REG_POWER_THRE_L,
+ LTC2947_PAGE1, 2,
+ DIV_ROUND_CLOSEST(val, 200000));
+ default:
+ return -ENOTSUPP;
+ }
+}
+
+static int ltc2947_write_curr(struct device *dev, const u32 attr,
+ long val)
+{
+ struct ltc2947_data *st = dev_get_drvdata(dev);
+
+ switch (attr) {
+ case hwmon_curr_reset_history:
+ if (val != 1)
+ return -EINVAL;
+ return ltc2947_reset_history(st, LTC2947_REG_CURRENT_MAX,
+ LTC2947_REG_CURRENT_MIN);
+ case hwmon_curr_max:
+ val = clamp_val(val, CURRENT_MIN, CURRENT_MAX);
+ return ltc2947_val_write(st, LTC2947_REG_CURRENT_THRE_H,
+ LTC2947_PAGE1, 2,
+ DIV_ROUND_CLOSEST(val, 12));
+ case hwmon_curr_min:
+ val = clamp_val(val, CURRENT_MIN, CURRENT_MAX);
+ return ltc2947_val_write(st, LTC2947_REG_CURRENT_THRE_L,
+ LTC2947_PAGE1, 2,
+ DIV_ROUND_CLOSEST(val, 12));
+ default:
+ return -ENOTSUPP;
+ }
+}
+
+static int ltc2947_write_in(struct device *dev, const u32 attr, long val,
+ const int channel)
+{
+ struct ltc2947_data *st = dev_get_drvdata(dev);
+
+ if (channel > LTC2947_VOLTAGE_DVCC_CHAN) {
+ dev_err(st->dev, "Invalid chan%d for voltage", channel);
+ return -EINVAL;
+ }
+
+ switch (attr) {
+ case hwmon_in_reset_history:
+ if (val != 1)
+ return -EINVAL;
+
+ if (channel == LTC2947_VOLTAGE_DVCC_CHAN)
+ return ltc2947_reset_history(st, LTC2947_REG_DVCC_MAX,
+ LTC2947_REG_DVCC_MIN);
+
+ return ltc2947_reset_history(st, LTC2947_REG_VOLTAGE_MAX,
+ LTC2947_REG_VOLTAGE_MIN);
+ case hwmon_in_max:
+ if (channel == LTC2947_VOLTAGE_DVCC_CHAN) {
+ val = clamp_val(val, VDVCC_MIN, VDVCC_MAX);
+ return ltc2947_val_write(st, LTC2947_REG_DVCC_THRE_H,
+ LTC2947_PAGE1, 2,
+ DIV_ROUND_CLOSEST(val, 145));
+ }
+
+ val = clamp_val(val, VOLTAGE_MIN, VOLTAGE_MAX);
+ return ltc2947_val_write(st, LTC2947_REG_VOLTAGE_THRE_H,
+ LTC2947_PAGE1, 2,
+ DIV_ROUND_CLOSEST(val, 2));
+ case hwmon_in_min:
+ if (channel == LTC2947_VOLTAGE_DVCC_CHAN) {
+ val = clamp_val(val, VDVCC_MIN, VDVCC_MAX);
+ return ltc2947_val_write(st, LTC2947_REG_DVCC_THRE_L,
+ LTC2947_PAGE1, 2,
+ DIV_ROUND_CLOSEST(val, 145));
+ }
+
+ val = clamp_val(val, VOLTAGE_MIN, VOLTAGE_MAX);
+ return ltc2947_val_write(st, LTC2947_REG_VOLTAGE_THRE_L,
+ LTC2947_PAGE1, 2,
+ DIV_ROUND_CLOSEST(val, 2));
+ default:
+ return -ENOTSUPP;
+ }
+}
+
+static int ltc2947_write(struct device *dev,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel, long val)
+{
+ switch (type) {
+ case hwmon_in:
+ return ltc2947_write_in(dev, attr, val, channel);
+ case hwmon_curr:
+ return ltc2947_write_curr(dev, attr, val);
+ case hwmon_power:
+ return ltc2947_write_power(dev, attr, val);
+ case hwmon_temp:
+ return ltc2947_write_temp(dev, attr, val, channel);
+ default:
+ return -ENOTSUPP;
+ }
+}
+
+static int ltc2947_read_labels(struct device *dev,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel, const char **str)
+{
+ switch (type) {
+ case hwmon_in:
+ if (channel == LTC2947_VOLTAGE_DVCC_CHAN)
+ *str = "DVCC";
+ else
+ *str = "VP-VM";
+ return 0;
+ case hwmon_curr:
+ *str = "IP-IM";
+ return 0;
+ case hwmon_temp:
+ if (channel == LTC2947_TEMP_FAN_CHAN)
+ *str = "TEMPFAN";
+ else
+ *str = "Ambient";
+ return 0;
+ case hwmon_power:
+ *str = "Power";
+ return 0;
+ default:
+ return -ENOTSUPP;
+ }
+}
+
+static int ltc2947_in_is_visible(const u32 attr)
+{
+ switch (attr) {
+ case hwmon_in_input:
+ case hwmon_in_highest:
+ case hwmon_in_lowest:
+ case hwmon_in_max_alarm:
+ case hwmon_in_min_alarm:
+ case hwmon_in_label:
+ return 0444;
+ case hwmon_in_reset_history:
+ return 0200;
+ case hwmon_in_max:
+ case hwmon_in_min:
+ return 0644;
+ default:
+ return 0;
+ }
+}
+
+static int ltc2947_curr_is_visible(const u32 attr)
+{
+ switch (attr) {
+ case hwmon_curr_input:
+ case hwmon_curr_highest:
+ case hwmon_curr_lowest:
+ case hwmon_curr_max_alarm:
+ case hwmon_curr_min_alarm:
+ case hwmon_curr_label:
+ return 0444;
+ case hwmon_curr_reset_history:
+ return 0200;
+ case hwmon_curr_max:
+ case hwmon_curr_min:
+ return 0644;
+ default:
+ return 0;
+ }
+}
+
+static int ltc2947_power_is_visible(const u32 attr)
+{
+ switch (attr) {
+ case hwmon_power_input:
+ case hwmon_power_input_highest:
+ case hwmon_power_input_lowest:
+ case hwmon_power_label:
+ case hwmon_power_max_alarm:
+ case hwmon_power_min_alarm:
+ return 0444;
+ case hwmon_power_reset_history:
+ return 0200;
+ case hwmon_power_max:
+ case hwmon_power_min:
+ return 0644;
+ default:
+ return 0;
+ }
+}
+
+static int ltc2947_temp_is_visible(const u32 attr)
+{
+ switch (attr) {
+ case hwmon_temp_input:
+ case hwmon_temp_highest:
+ case hwmon_temp_lowest:
+ case hwmon_temp_max_alarm:
+ case hwmon_temp_min_alarm:
+ case hwmon_temp_label:
+ return 0444;
+ case hwmon_temp_reset_history:
+ return 0200;
+ case hwmon_temp_max:
+ case hwmon_temp_min:
+ return 0644;
+ default:
+ return 0;
+ }
+}
+
+static umode_t ltc2947_is_visible(const void *data,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ switch (type) {
+ case hwmon_in:
+ return ltc2947_in_is_visible(attr);
+ case hwmon_curr:
+ return ltc2947_curr_is_visible(attr);
+ case hwmon_power:
+ return ltc2947_power_is_visible(attr);
+ case hwmon_temp:
+ return ltc2947_temp_is_visible(attr);
+ default:
+ return 0;
+ }
+}
+
+static const struct hwmon_channel_info *ltc2947_info[] = {
+ HWMON_CHANNEL_INFO(in,
+ HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST |
+ HWMON_I_MAX | HWMON_I_MIN | HWMON_I_RESET_HISTORY |
+ HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM |
+ HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST |
+ HWMON_I_MAX | HWMON_I_MIN | HWMON_I_RESET_HISTORY |
+ HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM |
+ HWMON_I_LABEL),
+ HWMON_CHANNEL_INFO(curr,
+ HWMON_C_INPUT | HWMON_C_LOWEST | HWMON_C_HIGHEST |
+ HWMON_C_MAX | HWMON_C_MIN | HWMON_C_RESET_HISTORY |
+ HWMON_C_MIN_ALARM | HWMON_C_MAX_ALARM |
+ HWMON_C_LABEL),
+ HWMON_CHANNEL_INFO(power,
+ HWMON_P_INPUT | HWMON_P_INPUT_LOWEST |
+ HWMON_P_INPUT_HIGHEST | HWMON_P_MAX | HWMON_P_MIN |
+ HWMON_P_RESET_HISTORY | HWMON_P_MAX_ALARM |
+ HWMON_P_MIN_ALARM | HWMON_P_LABEL),
+ HWMON_CHANNEL_INFO(temp,
+ HWMON_T_INPUT | HWMON_T_LOWEST | HWMON_T_HIGHEST |
+ HWMON_T_MAX | HWMON_T_MIN | HWMON_T_RESET_HISTORY |
+ HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM |
+ HWMON_T_LABEL,
+ HWMON_T_MAX_ALARM | HWMON_T_MIN_ALARM | HWMON_T_MAX |
+ HWMON_T_MIN | HWMON_T_LABEL),
+ NULL
+};
+
+static const struct hwmon_ops ltc2947_hwmon_ops = {
+ .is_visible = ltc2947_is_visible,
+ .read = ltc2947_read,
+ .write = ltc2947_write,
+ .read_string = ltc2947_read_labels,
+};
+
+static const struct hwmon_chip_info ltc2947_chip_info = {
+ .ops = &ltc2947_hwmon_ops,
+ .info = ltc2947_info,
+};
+
+/* energy attributes are 6bytes wide so we need u64 */
+static SENSOR_DEVICE_ATTR(energy1_input, 0444, ltc2947_show_value, NULL,
+ LTC2947_REG_ENERGY1);
+static SENSOR_DEVICE_ATTR(energy2_input, 0444, ltc2947_show_value, NULL,
+ LTC2947_REG_ENERGY2);
+
+static struct attribute *ltc2947_attrs[] = {
+ &sensor_dev_attr_energy1_input.dev_attr.attr,
+ &sensor_dev_attr_energy2_input.dev_attr.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(ltc2947);
+
+static void ltc2947_clk_disable(void *data)
+{
+ struct clk *extclk = data;
+
+ clk_disable_unprepare(extclk);
+}
+
+static int ltc2947_setup(struct ltc2947_data *st)
+{
+ int ret;
+ struct clk *extclk;
+ u32 dummy, deadband, pol;
+ u32 accum[2];
+
+ /* clear status register by reading it */
+ ret = regmap_read(st->map, LTC2947_REG_STATUS, &dummy);
+ if (ret)
+ return ret;
+ /*
+ * Set max/min for power here since the default values x scale
+ * would overflow on 32bit arch
+ */
+ ret = ltc2947_val_write(st, LTC2947_REG_POWER_THRE_H, LTC2947_PAGE1, 2,
+ POWER_MAX / 200000);
+ if (ret)
+ return ret;
+
+ ret = ltc2947_val_write(st, LTC2947_REG_POWER_THRE_L, LTC2947_PAGE1, 2,
+ POWER_MIN / 200000);
+ if (ret)
+ return ret;
+
+ /* check external clock presence */
+ extclk = devm_clk_get(st->dev, NULL);
+ if (!IS_ERR(extclk)) {
+ unsigned long rate_hz;
+ u8 pre = 0, div, tbctl;
+ u64 aux;
+
+ /* let's calculate and set the right valus in TBCTL */
+ rate_hz = clk_get_rate(extclk);
+ if (rate_hz < LTC2947_CLK_MIN || rate_hz > LTC2947_CLK_MAX) {
+ dev_err(st->dev, "Invalid rate:%lu for external clock",
+ rate_hz);
+ return -EINVAL;
+ }
+
+ ret = clk_prepare_enable(extclk);
+ if (ret)
+ return ret;
+
+ ret = devm_add_action_or_reset(st->dev, ltc2947_clk_disable,
+ extclk);
+ if (ret)
+ return ret;
+ /* as in table 1 of the datasheet */
+ if (rate_hz >= LTC2947_CLK_MIN && rate_hz <= 1000000)
+ pre = 0;
+ else if (rate_hz > 1000000 && rate_hz <= 2000000)
+ pre = 1;
+ else if (rate_hz > 2000000 && rate_hz <= 4000000)
+ pre = 2;
+ else if (rate_hz > 4000000 && rate_hz <= 8000000)
+ pre = 3;
+ else if (rate_hz > 8000000 && rate_hz <= 16000000)
+ pre = 4;
+ else if (rate_hz > 16000000 && rate_hz <= LTC2947_CLK_MAX)
+ pre = 5;
+ /*
+ * Div is given by:
+ * floor(fref / (2^PRE * 32768))
+ */
+ div = rate_hz / ((1 << pre) * 32768);
+ tbctl = LTC2947_PRE(pre) | LTC2947_DIV(div);
+
+ ret = regmap_write(st->map, LTC2947_REG_TBCTL, tbctl);
+ if (ret)
+ return ret;
+ /*
+ * The energy lsb is given by (in W*s):
+ * 06416 * (1/fref) * 2^PRE * (DIV + 1)
+ * The value is multiplied by 10E9
+ */
+ aux = (div + 1) * ((1 << pre) * 641600000ULL);
+ st->lsb_energy = DIV_ROUND_CLOSEST_ULL(aux, rate_hz);
+ } else {
+ /* 19.89E-6 * 10E9 */
+ st->lsb_energy = 19890;
+ }
+ ret = of_property_read_u32_array(st->dev->of_node,
+ "adi,accumulator-ctl-pol", accum,
+ ARRAY_SIZE(accum));
+ if (!ret) {
+ u32 accum_reg = LTC2947_ACCUM_POL_1(accum[0]) |
+ LTC2947_ACCUM_POL_2(accum[1]);
+
+ ret = regmap_write(st->map, LTC2947_REG_ACCUM_POL, accum_reg);
+ if (ret)
+ return ret;
+ }
+ ret = of_property_read_u32(st->dev->of_node,
+ "adi,accumulation-deadband-microamp",
+ &deadband);
+ if (!ret) {
+ /* the LSB is the same as the current, so 3mA */
+ ret = regmap_write(st->map, LTC2947_REG_ACCUM_DEADBAND,
+ deadband / (1000 * 3));
+ if (ret)
+ return ret;
+ }
+ /* check gpio cfg */
+ ret = of_property_read_u32(st->dev->of_node, "adi,gpio-out-pol", &pol);
+ if (!ret) {
+ /* setup GPIO as output */
+ u32 gpio_ctl = LTC2947_GPIO_EN(1) | LTC2947_GPIO_FAN_EN(1) |
+ LTC2947_GPIO_FAN_POL(pol);
+
+ st->gpio_out = true;
+ ret = regmap_write(st->map, LTC2947_REG_GPIOSTATCTL, gpio_ctl);
+ if (ret)
+ return ret;
+ }
+ ret = of_property_read_u32_array(st->dev->of_node, "adi,gpio-in-accum",
+ accum, ARRAY_SIZE(accum));
+ if (!ret) {
+ /*
+ * Setup the accum options. The gpioctl is already defined as
+ * input by default.
+ */
+ u32 accum_val = LTC2947_ACCUM_POL_1(accum[0]) |
+ LTC2947_ACCUM_POL_2(accum[1]);
+
+ if (st->gpio_out) {
+ dev_err(st->dev,
+ "Cannot have input gpio config if already configured as output");
+ return -EINVAL;
+ }
+
+ ret = regmap_write(st->map, LTC2947_REG_GPIO_ACCUM, accum_val);
+ if (ret)
+ return ret;
+ }
+
+ /* set continuos mode */
+ return regmap_update_bits(st->map, LTC2947_REG_CTRL,
+ LTC2947_CONT_MODE_MASK, LTC2947_CONT_MODE(1));
+}
+
+int ltc2947_core_probe(struct regmap *map, const char *name)
+{
+ struct ltc2947_data *st;
+ struct device *dev = regmap_get_device(map);
+ struct device *hwmon;
+ int ret;
+
+ st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL);
+ if (!st)
+ return -ENOMEM;
+
+ st->map = map;
+ st->dev = dev;
+ dev_set_drvdata(dev, st);
+ mutex_init(&st->lock);
+
+ ret = ltc2947_setup(st);
+ if (ret)
+ return ret;
+
+ hwmon = devm_hwmon_device_register_with_info(dev, name, st,
+ &ltc2947_chip_info,
+ ltc2947_groups);
+ return PTR_ERR_OR_ZERO(hwmon);
+}
+EXPORT_SYMBOL_GPL(ltc2947_core_probe);
+
+static int __maybe_unused ltc2947_resume(struct device *dev)
+{
+ struct ltc2947_data *st = dev_get_drvdata(dev);
+ u32 ctrl = 0;
+ int ret;
+
+ /* dummy read to wake the device */
+ ret = regmap_read(st->map, LTC2947_REG_CTRL, &ctrl);
+ if (ret)
+ return ret;
+ /*
+ * Wait for the device. It takes 100ms to wake up so, 10ms extra
+ * should be enough.
+ */
+ msleep(110);
+ ret = regmap_read(st->map, LTC2947_REG_CTRL, &ctrl);
+ if (ret)
+ return ret;
+ /* ctrl should be 0 */
+ if (ctrl != 0) {
+ dev_err(st->dev, "Device failed to wake up, ctl:%02X\n", ctrl);
+ return -ETIMEDOUT;
+ }
+
+ /* set continuous mode */
+ return regmap_update_bits(st->map, LTC2947_REG_CTRL,
+ LTC2947_CONT_MODE_MASK, LTC2947_CONT_MODE(1));
+}
+
+static int __maybe_unused ltc2947_suspend(struct device *dev)
+{
+ struct ltc2947_data *st = dev_get_drvdata(dev);
+
+ return regmap_update_bits(st->map, LTC2947_REG_CTRL,
+ LTC2947_SHUTDOWN_MASK, 1);
+}
+
+SIMPLE_DEV_PM_OPS(ltc2947_pm_ops, ltc2947_suspend, ltc2947_resume);
+EXPORT_SYMBOL_GPL(ltc2947_pm_ops);
+
+const struct of_device_id ltc2947_of_match[] = {
+ { .compatible = "adi,ltc2947" },
+ {}
+};
+EXPORT_SYMBOL_GPL(ltc2947_of_match);
+MODULE_DEVICE_TABLE(of, ltc2947_of_match);
+
+MODULE_AUTHOR("Nuno Sa <nuno.sa@analog.com>");
+MODULE_DESCRIPTION("LTC2947 power and energy monitor core driver");
+MODULE_LICENSE("GPL");