hwmon: (pmbus) Add support for Analog Devices LT7182S
Add support for Analog Devices LT7182S Dual Channel 6A, 20V PolyPhase Step-Down Silent Switcher with Digital Power System Management. Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck
parent
5e9caf86b8
commit
e10d9e4ca1
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@ -109,6 +109,7 @@ Hardware Monitoring Kernel Drivers
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lm95234
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lm95245
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lochnagar
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lt7182s
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ltc2992
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ltc2945
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ltc2947
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@ -0,0 +1,92 @@
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.. SPDX-License-Identifier: GPL-2.0
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Kernel driver lt7182s
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=====================
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Supported chips:
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* ADI LT7182S
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Prefix: 'lt7182s'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/lt7182s.html
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Author: Guenter Roeck <linux@roeck-us.net>
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Description
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-----------
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LT7182S is a Dual Channel 6A, 20V PolyPhase Step-Down Silent Switcher with
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Digital Power System Management support.
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Usage Notes
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-----------
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This driver does not probe for PMBus devices. You will have to instantiate
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devices explicitly.
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Example: the following commands will load the driver for a LT7182S
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at address 0x4f on I2C bus #4::
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# modprobe lt7182s
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# echo lt7182s 0x4f > /sys/bus/i2c/devices/i2c-4/new_device
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It can also be instantiated by declaring an entry in device tree.
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Sysfs attributes
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----------------
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======================= ====================================
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curr[1-2]_label "iin[12]"
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curr[1-2]_input Measured input current
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curr[1-2]_max Maximum input current
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curr[1-2]_max_alarm Current high alarm
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curr[3-4]_label "iout[1-2]"
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curr[3-4]_input Measured output current
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curr[3-4]_highest Highest measured output current
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curr[3-4]_max Maximum output current
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curr[3-4]_max_alarm Output current high alarm
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in[1-2]_label "vin[12]"
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in[1-2]_input Measured input voltage
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in[1-2]_highest Highest measured input voltage
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in[1-2]_crit Critical maximum input voltage
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in[1-2]_crit_alarm Input voltage critical high alarm
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in[1-2]_min Minimum input voltage
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in[1-2]_min_alarm Input voltage low alarm
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in[1-2]_rated_min Rated minimum input voltage
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in[1-2]_rated_max Rated maximum input voltage
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in1_reset_history Write to reset history for all attributes
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in[3-5]_label "vmon[1-3]"
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in[3-5]_input Measured voltage on ITH1/ITH2/EXTVCC pins
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Only available if enabled with MFR_ADC_CONTROL_LT7182S
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command.
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in[3-4|6-7]_label "vout[1-2]"
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in[3-4|6-7]_input Measured output voltage
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in[3-4|6-7]_highest Highest measured output voltage
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in[3-4|6-7]_lcrit Critical minimum output voltage
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in[3-4|6-7]_lcrit_alarm Output voltage critical low alarm
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in[3-4|6-7]_min Minimum output voltage
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in[3-4|6-7]_max_alarm Output voltage low alarm
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in[3-4|6-7]_max Maximum output voltage
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in[3-4|6-7]_max_alarm Output voltage high alarm
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in[3-4|6-7]_crit Critical maximum output voltage
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in[3-4|6-7]_crit_alarm Output voltage critical high alarm
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power[1-2]_label "pout[1-2]"
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power[1-2]_input Measured output power
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temp1_input Measured temperature
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temp1_crit Critical high temperature
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temp1_crit_alarm Chip temperature critical high alarm
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temp1_max Maximum temperature
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temp1_max_alarm Chip temperature high alarm
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======================= ====================================
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@ -181,6 +181,15 @@ config SENSORS_LM25066_REGULATOR
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If you say yes here you get regulator support for National
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Semiconductor LM25066, LM5064, and LM5066.
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config SENSORS_LT7182S
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tristate "Analog Devices LT7182S"
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help
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If you say yes here you get hardware monitoring support for Analog
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Devices LT7182S.
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This driver can also be built as a module. If so, the module will
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be called lt7182s.
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config SENSORS_LTC2978
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tristate "Linear Technologies LTC2978 and compatibles"
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help
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@ -20,6 +20,7 @@ obj-$(CONFIG_SENSORS_IR38064) += ir38064.o
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obj-$(CONFIG_SENSORS_IRPS5401) += irps5401.o
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obj-$(CONFIG_SENSORS_ISL68137) += isl68137.o
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obj-$(CONFIG_SENSORS_LM25066) += lm25066.o
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obj-$(CONFIG_SENSORS_LT7182S) += lt7182s.o
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obj-$(CONFIG_SENSORS_LTC2978) += ltc2978.o
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obj-$(CONFIG_SENSORS_LTC3815) += ltc3815.o
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obj-$(CONFIG_SENSORS_MAX15301) += max15301.o
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@ -0,0 +1,195 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Hardware monitoring driver for Analog Devices LT7182S
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*
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* Copyright (c) 2022 Guenter Roeck
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*
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*/
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#include <linux/bits.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include "pmbus.h"
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#define LT7182S_NUM_PAGES 2
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#define MFR_READ_EXTVCC 0xcd
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#define MFR_READ_ITH 0xce
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#define MFR_CONFIG_ALL_LT7182S 0xd1
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#define MFR_IOUT_PEAK 0xd7
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#define MFR_ADC_CONTROL_LT7182S 0xd8
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#define MFR_DEBUG_TELEMETRY BIT(0)
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#define MFR_VOUT_PEAK 0xdd
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#define MFR_VIN_PEAK 0xde
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#define MFR_TEMPERATURE_1_PEAK 0xdf
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#define MFR_CLEAR_PEAKS 0xe3
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#define MFR_CONFIG_IEEE BIT(8)
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static int lt7182s_read_word_data(struct i2c_client *client, int page, int phase, int reg)
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{
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int ret;
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switch (reg) {
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case PMBUS_VIRT_READ_VMON:
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if (page == 0 || page == 1)
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ret = pmbus_read_word_data(client, page, phase, MFR_READ_ITH);
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else
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ret = pmbus_read_word_data(client, 0, phase, MFR_READ_EXTVCC);
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break;
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case PMBUS_VIRT_READ_IOUT_MAX:
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ret = pmbus_read_word_data(client, page, phase, MFR_IOUT_PEAK);
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break;
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case PMBUS_VIRT_READ_VOUT_MAX:
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ret = pmbus_read_word_data(client, page, phase, MFR_VOUT_PEAK);
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break;
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case PMBUS_VIRT_READ_VIN_MAX:
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ret = pmbus_read_word_data(client, page, phase, MFR_VIN_PEAK);
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break;
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case PMBUS_VIRT_READ_TEMP_MAX:
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ret = pmbus_read_word_data(client, page, phase, MFR_TEMPERATURE_1_PEAK);
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break;
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case PMBUS_VIRT_RESET_VIN_HISTORY:
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ret = (page == 0) ? 0 : -ENODATA;
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break;
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default:
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ret = -ENODATA;
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break;
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}
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return ret;
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}
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static int lt7182s_write_word_data(struct i2c_client *client, int page, int reg, u16 word)
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{
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int ret;
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switch (reg) {
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case PMBUS_VIRT_RESET_VIN_HISTORY:
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ret = pmbus_write_byte(client, 0, MFR_CLEAR_PEAKS);
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break;
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default:
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ret = -ENODATA;
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break;
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}
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return ret;
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}
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static struct pmbus_driver_info lt7182s_info = {
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.pages = LT7182S_NUM_PAGES,
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.format[PSC_VOLTAGE_IN] = linear,
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.format[PSC_VOLTAGE_OUT] = linear,
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.format[PSC_CURRENT_IN] = linear,
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.format[PSC_CURRENT_OUT] = linear,
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.format[PSC_TEMPERATURE] = linear,
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.format[PSC_POWER] = linear,
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.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT |
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PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT |
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PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
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PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
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.func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT |
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PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT |
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PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
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PMBUS_HAVE_STATUS_INPUT,
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.read_word_data = lt7182s_read_word_data,
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.write_word_data = lt7182s_write_word_data,
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};
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static int lt7182s_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct pmbus_driver_info *info;
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u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
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int ret;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_BYTE_DATA |
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I2C_FUNC_SMBUS_READ_WORD_DATA |
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I2C_FUNC_SMBUS_READ_BLOCK_DATA))
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return -ENODEV;
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ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
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if (ret < 0) {
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dev_err(dev, "Failed to read PMBUS_MFR_ID\n");
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return ret;
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}
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if (ret != 3 || strncmp(buf, "ADI", 3)) {
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buf[ret] = '\0';
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dev_err(dev, "Manufacturer '%s' not supported\n", buf);
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return -ENODEV;
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}
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ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
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if (ret < 0) {
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dev_err(dev, "Failed to read PMBUS_MFR_MODEL\n");
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return ret;
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}
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if (ret != 7 || strncmp(buf, "LT7182S", 7)) {
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buf[ret] = '\0';
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dev_err(dev, "Model '%s' not supported\n", buf);
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return -ENODEV;
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}
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info = devm_kmemdup(dev, <7182s_info,
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sizeof(struct pmbus_driver_info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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/* Set data format to IEEE754 if configured */
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ret = i2c_smbus_read_word_data(client, MFR_CONFIG_ALL_LT7182S);
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if (ret < 0)
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return ret;
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if (ret & MFR_CONFIG_IEEE) {
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info->format[PSC_VOLTAGE_IN] = ieee754;
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info->format[PSC_VOLTAGE_OUT] = ieee754;
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info->format[PSC_CURRENT_IN] = ieee754;
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info->format[PSC_CURRENT_OUT] = ieee754;
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info->format[PSC_TEMPERATURE] = ieee754;
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info->format[PSC_POWER] = ieee754;
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}
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/* Enable VMON output if configured */
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ret = i2c_smbus_read_byte_data(client, MFR_ADC_CONTROL_LT7182S);
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if (ret < 0)
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return ret;
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if (ret & MFR_DEBUG_TELEMETRY) {
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info->pages = 3;
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info->func[0] |= PMBUS_HAVE_VMON;
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info->func[1] |= PMBUS_HAVE_VMON;
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info->func[2] = PMBUS_HAVE_VMON;
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}
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return pmbus_do_probe(client, info);
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}
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static const struct i2c_device_id lt7182s_id[] = {
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{ "lt7182s", 0 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, lt7182s_id);
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static const struct of_device_id __maybe_unused lt7182s_of_match[] = {
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{ .compatible = "adi,lt7182s" },
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{}
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};
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static struct i2c_driver lt7182s_driver = {
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.driver = {
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.name = "lt7182s",
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.of_match_table = of_match_ptr(lt7182s_of_match),
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},
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.probe_new = lt7182s_probe,
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.id_table = lt7182s_id,
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};
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module_i2c_driver(lt7182s_driver);
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MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
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MODULE_DESCRIPTION("PMBus driver for Analog Devices LT7182S");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS(PMBUS);
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