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![Nuno Sá](/assets/img/avatar_default.png)
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>
1183 lines
30 KiB
C
1183 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Analog Devices LTC2947 high precision power and energy monitor
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*
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* Copyright 2019 Analog Devices Inc.
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*/
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#include <linux/bitfield.h>
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#include <linux/bits.h>
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#include "ltc2947.h"
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/* register's */
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#define LTC2947_REG_PAGE_CTRL 0xFF
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#define LTC2947_REG_CTRL 0xF0
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#define LTC2947_REG_TBCTL 0xE9
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#define LTC2947_CONT_MODE_MASK BIT(3)
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#define LTC2947_CONT_MODE(x) FIELD_PREP(LTC2947_CONT_MODE_MASK, x)
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#define LTC2947_PRE_MASK GENMASK(2, 0)
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#define LTC2947_PRE(x) FIELD_PREP(LTC2947_PRE_MASK, x)
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#define LTC2947_DIV_MASK GENMASK(7, 3)
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#define LTC2947_DIV(x) FIELD_PREP(LTC2947_DIV_MASK, x)
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#define LTC2947_SHUTDOWN_MASK BIT(0)
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#define LTC2947_REG_ACCUM_POL 0xE1
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#define LTC2947_ACCUM_POL_1_MASK GENMASK(1, 0)
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#define LTC2947_ACCUM_POL_1(x) FIELD_PREP(LTC2947_ACCUM_POL_1_MASK, x)
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#define LTC2947_ACCUM_POL_2_MASK GENMASK(3, 2)
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#define LTC2947_ACCUM_POL_2(x) FIELD_PREP(LTC2947_ACCUM_POL_2_MASK, x)
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#define LTC2947_REG_ACCUM_DEADBAND 0xE4
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#define LTC2947_REG_GPIOSTATCTL 0x67
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#define LTC2947_GPIO_EN_MASK BIT(0)
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#define LTC2947_GPIO_EN(x) FIELD_PREP(LTC2947_GPIO_EN_MASK, x)
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#define LTC2947_GPIO_FAN_EN_MASK BIT(6)
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#define LTC2947_GPIO_FAN_EN(x) FIELD_PREP(LTC2947_GPIO_FAN_EN_MASK, x)
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#define LTC2947_GPIO_FAN_POL_MASK BIT(7)
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#define LTC2947_GPIO_FAN_POL(x) FIELD_PREP(LTC2947_GPIO_FAN_POL_MASK, x)
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#define LTC2947_REG_GPIO_ACCUM 0xE3
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/* 200Khz */
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#define LTC2947_CLK_MIN 200000
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/* 25Mhz */
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#define LTC2947_CLK_MAX 25000000
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#define LTC2947_PAGE0 0
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#define LTC2947_PAGE1 1
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/* Voltage registers */
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#define LTC2947_REG_VOLTAGE 0xA0
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#define LTC2947_REG_VOLTAGE_MAX 0x50
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#define LTC2947_REG_VOLTAGE_MIN 0x52
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#define LTC2947_REG_VOLTAGE_THRE_H 0x90
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#define LTC2947_REG_VOLTAGE_THRE_L 0x92
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#define LTC2947_REG_DVCC 0xA4
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#define LTC2947_REG_DVCC_MAX 0x58
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#define LTC2947_REG_DVCC_MIN 0x5A
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#define LTC2947_REG_DVCC_THRE_H 0x98
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#define LTC2947_REG_DVCC_THRE_L 0x9A
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#define LTC2947_VOLTAGE_GEN_CHAN 0
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#define LTC2947_VOLTAGE_DVCC_CHAN 1
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/* in mV */
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#define VOLTAGE_MAX 15500
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#define VOLTAGE_MIN -300
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#define VDVCC_MAX 15000
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#define VDVCC_MIN 4750
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/* Current registers */
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#define LTC2947_REG_CURRENT 0x90
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#define LTC2947_REG_CURRENT_MAX 0x40
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#define LTC2947_REG_CURRENT_MIN 0x42
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#define LTC2947_REG_CURRENT_THRE_H 0x80
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#define LTC2947_REG_CURRENT_THRE_L 0x82
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/* in mA */
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#define CURRENT_MAX 30000
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#define CURRENT_MIN -30000
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/* Power registers */
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#define LTC2947_REG_POWER 0x93
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#define LTC2947_REG_POWER_MAX 0x44
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#define LTC2947_REG_POWER_MIN 0x46
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#define LTC2947_REG_POWER_THRE_H 0x84
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#define LTC2947_REG_POWER_THRE_L 0x86
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/* in uW */
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#define POWER_MAX 450000000
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#define POWER_MIN -450000000
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/* Temperature registers */
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#define LTC2947_REG_TEMP 0xA2
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#define LTC2947_REG_TEMP_MAX 0x54
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#define LTC2947_REG_TEMP_MIN 0x56
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#define LTC2947_REG_TEMP_THRE_H 0x94
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#define LTC2947_REG_TEMP_THRE_L 0x96
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#define LTC2947_REG_TEMP_FAN_THRE_H 0x9C
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#define LTC2947_REG_TEMP_FAN_THRE_L 0x9E
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#define LTC2947_TEMP_FAN_CHAN 1
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/* in millidegress Celsius */
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#define TEMP_MAX 85000
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#define TEMP_MIN -40000
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/* Energy registers */
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#define LTC2947_REG_ENERGY1 0x06
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#define LTC2947_REG_ENERGY2 0x16
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/* Status/Alarm/Overflow registers */
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#define LTC2947_REG_STATUS 0x80
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#define LTC2947_REG_STATVT 0x81
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#define LTC2947_REG_STATIP 0x82
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#define LTC2947_REG_STATVDVCC 0x87
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#define LTC2947_ALERTS_SIZE (LTC2947_REG_STATVDVCC - LTC2947_REG_STATUS)
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#define LTC2947_MAX_VOLTAGE_MASK BIT(0)
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#define LTC2947_MIN_VOLTAGE_MASK BIT(1)
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#define LTC2947_MAX_CURRENT_MASK BIT(0)
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#define LTC2947_MIN_CURRENT_MASK BIT(1)
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#define LTC2947_MAX_POWER_MASK BIT(2)
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#define LTC2947_MIN_POWER_MASK BIT(3)
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#define LTC2947_MAX_TEMP_MASK BIT(2)
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#define LTC2947_MIN_TEMP_MASK BIT(3)
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#define LTC2947_MAX_TEMP_FAN_MASK BIT(4)
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#define LTC2947_MIN_TEMP_FAN_MASK BIT(5)
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struct ltc2947_data {
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struct regmap *map;
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struct device *dev;
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/*
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* The mutex is needed because the device has 2 memory pages. When
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* reading/writing the correct page needs to be set so that, the
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* complete sequence select_page->read/write needs to be protected.
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*/
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struct mutex lock;
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u32 lsb_energy;
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bool gpio_out;
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};
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static int __ltc2947_val_read16(const struct ltc2947_data *st, const u8 reg,
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u64 *val)
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{
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__be16 __val = 0;
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int ret;
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ret = regmap_bulk_read(st->map, reg, &__val, 2);
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if (ret)
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return ret;
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*val = be16_to_cpu(__val);
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return 0;
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}
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static int __ltc2947_val_read24(const struct ltc2947_data *st, const u8 reg,
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u64 *val)
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{
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__be32 __val = 0;
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int ret;
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ret = regmap_bulk_read(st->map, reg, &__val, 3);
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if (ret)
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return ret;
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*val = be32_to_cpu(__val) >> 8;
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return 0;
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}
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static int __ltc2947_val_read64(const struct ltc2947_data *st, const u8 reg,
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u64 *val)
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{
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__be64 __val = 0;
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int ret;
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ret = regmap_bulk_read(st->map, reg, &__val, 6);
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if (ret)
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return ret;
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*val = be64_to_cpu(__val) >> 16;
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return 0;
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}
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static int ltc2947_val_read(struct ltc2947_data *st, const u8 reg,
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const u8 page, const size_t size, s64 *val)
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{
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int ret;
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u64 __val = 0;
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mutex_lock(&st->lock);
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ret = regmap_write(st->map, LTC2947_REG_PAGE_CTRL, page);
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if (ret) {
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mutex_unlock(&st->lock);
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return ret;
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}
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dev_dbg(st->dev, "Read val, reg:%02X, p:%d sz:%zu\n", reg, page,
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size);
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switch (size) {
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case 2:
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ret = __ltc2947_val_read16(st, reg, &__val);
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break;
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case 3:
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ret = __ltc2947_val_read24(st, reg, &__val);
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break;
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case 6:
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ret = __ltc2947_val_read64(st, reg, &__val);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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mutex_unlock(&st->lock);
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if (ret)
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return ret;
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*val = sign_extend64(__val, (8 * size) - 1);
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dev_dbg(st->dev, "Got s:%lld, u:%016llX\n", *val, __val);
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return 0;
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}
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static int __ltc2947_val_write64(const struct ltc2947_data *st, const u8 reg,
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const u64 val)
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{
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__be64 __val;
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__val = cpu_to_be64(val << 16);
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return regmap_bulk_write(st->map, reg, &__val, 6);
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}
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static int __ltc2947_val_write16(const struct ltc2947_data *st, const u8 reg,
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const u16 val)
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{
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__be16 __val;
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__val = cpu_to_be16(val);
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return regmap_bulk_write(st->map, reg, &__val, 2);
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}
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static int ltc2947_val_write(struct ltc2947_data *st, const u8 reg,
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const u8 page, const size_t size, const u64 val)
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{
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int ret;
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mutex_lock(&st->lock);
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/* set device on correct page */
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ret = regmap_write(st->map, LTC2947_REG_PAGE_CTRL, page);
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if (ret) {
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mutex_unlock(&st->lock);
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return ret;
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}
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dev_dbg(st->dev, "Write val, r:%02X, p:%d, sz:%zu, val:%016llX\n",
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reg, page, size, val);
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switch (size) {
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case 2:
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ret = __ltc2947_val_write16(st, reg, val);
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break;
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case 6:
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ret = __ltc2947_val_write64(st, reg, val);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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mutex_unlock(&st->lock);
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return ret;
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}
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static int ltc2947_reset_history(struct ltc2947_data *st, const u8 reg_h,
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const u8 reg_l)
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{
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int ret;
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/*
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* let's reset the tracking register's. Tracking register's have all
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* 2 bytes size
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*/
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ret = ltc2947_val_write(st, reg_h, LTC2947_PAGE0, 2, 0x8000U);
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if (ret)
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return ret;
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return ltc2947_val_write(st, reg_l, LTC2947_PAGE0, 2, 0x7FFFU);
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}
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static int ltc2947_alarm_read(struct ltc2947_data *st, const u8 reg,
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const u32 mask, long *val)
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{
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u8 offset = reg - LTC2947_REG_STATUS;
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/* +1 to include status reg */
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char alarms[LTC2947_ALERTS_SIZE + 1];
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int ret = 0;
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memset(alarms, 0, sizeof(alarms));
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mutex_lock(&st->lock);
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ret = regmap_write(st->map, LTC2947_REG_PAGE_CTRL, LTC2947_PAGE0);
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if (ret)
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goto unlock;
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dev_dbg(st->dev, "Read alarm, reg:%02X, mask:%02X\n", reg, mask);
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/*
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* As stated in the datasheet, when Threshold and Overflow registers
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* are used, the status and all alert registers must be read in one
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* multi-byte transaction.
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*/
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ret = regmap_bulk_read(st->map, LTC2947_REG_STATUS, alarms,
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sizeof(alarms));
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if (ret)
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goto unlock;
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/* get the alarm */
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*val = !!(alarms[offset] & mask);
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unlock:
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mutex_unlock(&st->lock);
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return ret;
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}
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static ssize_t ltc2947_show_value(struct device *dev,
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struct device_attribute *da, char *buf)
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{
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struct ltc2947_data *st = dev_get_drvdata(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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int ret;
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s64 val = 0;
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ret = ltc2947_val_read(st, attr->index, LTC2947_PAGE0, 6, &val);
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if (ret)
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return ret;
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/* value in microJoule. st->lsb_energy was multiplied by 10E9 */
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val = div_s64(val * st->lsb_energy, 1000);
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return sprintf(buf, "%lld\n", val);
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}
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static int ltc2947_read_temp(struct device *dev, const u32 attr, long *val,
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const int channel)
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{
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int ret;
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struct ltc2947_data *st = dev_get_drvdata(dev);
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s64 __val = 0;
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switch (attr) {
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case hwmon_temp_input:
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ret = ltc2947_val_read(st, LTC2947_REG_TEMP, LTC2947_PAGE0,
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2, &__val);
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break;
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case hwmon_temp_highest:
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ret = ltc2947_val_read(st, LTC2947_REG_TEMP_MAX, LTC2947_PAGE0,
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2, &__val);
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break;
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case hwmon_temp_lowest:
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ret = ltc2947_val_read(st, LTC2947_REG_TEMP_MIN, LTC2947_PAGE0,
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2, &__val);
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break;
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case hwmon_temp_max_alarm:
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if (channel == LTC2947_TEMP_FAN_CHAN)
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return ltc2947_alarm_read(st, LTC2947_REG_STATVT,
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LTC2947_MAX_TEMP_FAN_MASK,
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val);
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return ltc2947_alarm_read(st, LTC2947_REG_STATVT,
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LTC2947_MAX_TEMP_MASK, val);
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case hwmon_temp_min_alarm:
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if (channel == LTC2947_TEMP_FAN_CHAN)
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return ltc2947_alarm_read(st, LTC2947_REG_STATVT,
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LTC2947_MIN_TEMP_FAN_MASK,
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val);
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return ltc2947_alarm_read(st, LTC2947_REG_STATVT,
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LTC2947_MIN_TEMP_MASK, val);
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case hwmon_temp_max:
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if (channel == LTC2947_TEMP_FAN_CHAN)
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ret = ltc2947_val_read(st, LTC2947_REG_TEMP_FAN_THRE_H,
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LTC2947_PAGE1, 2, &__val);
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else
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ret = ltc2947_val_read(st, LTC2947_REG_TEMP_THRE_H,
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LTC2947_PAGE1, 2, &__val);
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break;
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case hwmon_temp_min:
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if (channel == LTC2947_TEMP_FAN_CHAN)
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ret = ltc2947_val_read(st, LTC2947_REG_TEMP_FAN_THRE_L,
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LTC2947_PAGE1, 2, &__val);
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else
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ret = ltc2947_val_read(st, LTC2947_REG_TEMP_THRE_L,
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LTC2947_PAGE1, 2, &__val);
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break;
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default:
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return -ENOTSUPP;
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}
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if (ret)
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return ret;
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/* in milidegrees celcius, temp is given by: */
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*val = (__val * 204) + 550;
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return 0;
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}
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static int ltc2947_read_power(struct device *dev, const u32 attr, long *val)
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{
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struct ltc2947_data *st = dev_get_drvdata(dev);
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int ret;
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u32 lsb = 200000; /* in uW */
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s64 __val = 0;
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switch (attr) {
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case hwmon_power_input:
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ret = ltc2947_val_read(st, LTC2947_REG_POWER, LTC2947_PAGE0,
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3, &__val);
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lsb = 50000;
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break;
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case hwmon_power_input_highest:
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ret = ltc2947_val_read(st, LTC2947_REG_POWER_MAX, LTC2947_PAGE0,
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2, &__val);
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break;
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case hwmon_power_input_lowest:
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ret = ltc2947_val_read(st, LTC2947_REG_POWER_MIN, LTC2947_PAGE0,
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2, &__val);
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break;
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case hwmon_power_max_alarm:
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return ltc2947_alarm_read(st, LTC2947_REG_STATIP,
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LTC2947_MAX_POWER_MASK, val);
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case hwmon_power_min_alarm:
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return ltc2947_alarm_read(st, LTC2947_REG_STATIP,
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LTC2947_MIN_POWER_MASK, val);
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case hwmon_power_max:
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ret = ltc2947_val_read(st, LTC2947_REG_POWER_THRE_H,
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LTC2947_PAGE1, 2, &__val);
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break;
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case hwmon_power_min:
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ret = ltc2947_val_read(st, LTC2947_REG_POWER_THRE_L,
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LTC2947_PAGE1, 2, &__val);
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break;
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default:
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return -ENOTSUPP;
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}
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if (ret)
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return ret;
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|
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*val = __val * lsb;
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|
|
|
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 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,
|
|
<c2947_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");
|