diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/hwmon/ltc2947-core.c | 1171 |
1 files changed, 1171 insertions, 0 deletions
diff --git a/drivers/hwmon/ltc2947-core.c b/drivers/hwmon/ltc2947-core.c new file mode 100644 index 000000000..2dbbbac9d --- /dev/null +++ b/drivers/hwmon/ltc2947-core.c @@ -0,0 +1,1171 @@ +// 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) + 5500; + + 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 = <c2947_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 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_optional_enabled(st->dev, NULL); + if (IS_ERR(extclk)) + return dev_err_probe(st->dev, PTR_ERR(extclk), + "Failed to get external clock\n"); + + if (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; + } + + /* 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, + <c2947_chip_info, + ltc2947_groups); + return PTR_ERR_OR_ZERO(hwmon); +} +EXPORT_SYMBOL_GPL(ltc2947_core_probe); + +static int 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 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); +} + +EXPORT_SIMPLE_DEV_PM_OPS(ltc2947_pm_ops, ltc2947_suspend, ltc2947_resume); + +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"); |