hwmon: (pmbus) Driver for Maxim MAX16601
MAX16601 is a VR13.HC Dual-Output Voltage Regulator Chipset, implementing a (8+1) multiphase synchronous buck converter. Cc: Alex Qiu <xqiu@google.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck
Родитель
d86f3c9bba
Коммит
2138f8853a
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@ -106,6 +106,7 @@ Hardware Monitoring Kernel Drivers
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max16064
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max16065
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max1619
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max16601
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max1668
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max197
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max20730
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@ -0,0 +1,159 @@
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.. SPDX-License-Identifier: GPL-2.0
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Kernel driver max16601
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======================
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Supported chips:
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* Maxim MAX16601
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Prefix: 'max16601'
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Addresses scanned: -
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Datasheet: Not published
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Author: Guenter Roeck <linux@roeck-us.net>
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Description
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-----------
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This driver supports the MAX16601 VR13.HC Dual-Output Voltage Regulator
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Chipset.
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The driver is a client driver to the core PMBus driver.
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Please see Documentation/hwmon/pmbus.rst for details on PMBus client drivers.
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Usage Notes
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-----------
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This driver does not auto-detect devices. You will have to instantiate the
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devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for
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details.
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Platform data support
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---------------------
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The driver supports standard PMBus driver platform data.
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Sysfs entries
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-------------
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The following attributes are supported.
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======================= =======================================================
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in1_label "vin1"
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in1_input VCORE input voltage.
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in1_alarm Input voltage alarm.
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in2_label "vout1"
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in2_input VCORE output voltage.
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in2_alarm Output voltage alarm.
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curr1_label "iin1"
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curr1_input VCORE input current, derived from duty cycle and output
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current.
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curr1_max Maximum input current.
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curr1_max_alarm Current high alarm.
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curr2_label "iin1.0"
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curr2_input VCORE phase 0 input current.
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curr3_label "iin1.1"
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curr3_input VCORE phase 1 input current.
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curr4_label "iin1.2"
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curr4_input VCORE phase 2 input current.
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curr5_label "iin1.3"
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curr5_input VCORE phase 3 input current.
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curr6_label "iin1.4"
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curr6_input VCORE phase 4 input current.
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curr7_label "iin1.5"
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curr7_input VCORE phase 5 input current.
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curr8_label "iin1.6"
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curr8_input VCORE phase 6 input current.
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curr9_label "iin1.7"
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curr9_input VCORE phase 7 input current.
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curr10_label "iin2"
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curr10_input VCORE input current, derived from sensor element.
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curr11_label "iin3"
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curr11_input VSA input current.
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curr12_label "iout1"
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curr12_input VCORE output current.
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curr12_crit Critical output current.
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curr12_crit_alarm Output current critical alarm.
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curr12_max Maximum output current.
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curr12_max_alarm Output current high alarm.
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curr13_label "iout1.0"
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curr13_input VCORE phase 0 output current.
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curr14_label "iout1.1"
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curr14_input VCORE phase 1 output current.
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curr15_label "iout1.2"
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curr15_input VCORE phase 2 output current.
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curr16_label "iout1.3"
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curr16_input VCORE phase 3 output current.
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curr17_label "iout1.4"
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curr17_input VCORE phase 4 output current.
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curr18_label "iout1.5"
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curr18_input VCORE phase 5 output current.
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curr19_label "iout1.6"
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curr19_input VCORE phase 6 output current.
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curr20_label "iout1.7"
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curr20_input VCORE phase 7 output current.
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curr21_label "iout3"
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curr21_input VSA output current.
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curr21_highest Historical maximum VSA output current.
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curr21_reset_history Write any value to reset curr21_highest.
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curr21_crit Critical output current.
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curr21_crit_alarm Output current critical alarm.
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curr21_max Maximum output current.
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curr21_max_alarm Output current high alarm.
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power1_label "pin1"
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power1_input Input power, derived from duty cycle and output current.
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power1_alarm Input power alarm.
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power2_label "pin2"
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power2_input Input power, derived from input current sensor.
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power3_label "pout"
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power3_input Output power.
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temp1_input VCORE 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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temp2_input TSENSE_0 temperature
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temp3_input TSENSE_1 temperature
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temp4_input TSENSE_2 temperature
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temp5_input TSENSE_3 temperature
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temp6_input VSA temperature.
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temp6_crit Critical high temperature.
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temp6_crit_alarm Chip temperature critical high alarm.
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temp6_max Maximum temperature.
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temp6_max_alarm Chip temperature high alarm.
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======================= =======================================================
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@ -146,6 +146,15 @@ config SENSORS_MAX16064
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This driver can also be built as a module. If so, the module will
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be called max16064.
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config SENSORS_MAX16601
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tristate "Maxim MAX16601"
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help
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If you say yes here you get hardware monitoring support for Maxim
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MAX16601.
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This driver can also be built as a module. If so, the module will
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be called max16601.
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config SENSORS_MAX20730
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tristate "Maxim MAX20730, MAX20734, MAX20743"
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help
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@ -17,6 +17,7 @@ obj-$(CONFIG_SENSORS_LM25066) += lm25066.o
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obj-$(CONFIG_SENSORS_LTC2978) += ltc2978.o
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obj-$(CONFIG_SENSORS_LTC3815) += ltc3815.o
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obj-$(CONFIG_SENSORS_MAX16064) += max16064.o
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obj-$(CONFIG_SENSORS_MAX16601) += max16601.o
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obj-$(CONFIG_SENSORS_MAX20730) += max20730.o
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obj-$(CONFIG_SENSORS_MAX20751) += max20751.o
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obj-$(CONFIG_SENSORS_MAX31785) += max31785.o
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@ -0,0 +1,314 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Hardware monitoring driver for Maxim MAX16601
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*
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* Implementation notes:
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*
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* Ths chip supports two rails, VCORE and VSA. Telemetry information for the
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* two rails is reported in two subsequent I2C addresses. The driver
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* instantiates a dummy I2C client at the second I2C address to report
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* information for the VSA rail in a single instance of the driver.
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* Telemetry for the VSA rail is reported to the PMBus core in PMBus page 2.
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*
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* The chip reports input current using two separate methods. The input current
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* reported with the standard READ_IIN command is derived from the output
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* current. The first method is reported to the PMBus core with PMBus page 0,
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* the second method is reported with PMBus page 1.
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*
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* The chip supports reading per-phase temperatures and per-phase input/output
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* currents for VCORE. Telemetry is reported in vendor specific registers.
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* The driver translates the vendor specific register values to PMBus standard
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* register values and reports per-phase information in PMBus page 0.
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*
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* Copyright 2019, 2020 Google LLC.
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*/
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#include <linux/bits.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 "pmbus.h"
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#define REG_SETPT_DVID 0xd1
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#define DAC_10MV_MODE BIT(4)
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#define REG_IOUT_AVG_PK 0xee
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#define REG_IIN_SENSOR 0xf1
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#define REG_TOTAL_INPUT_POWER 0xf2
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#define REG_PHASE_ID 0xf3
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#define CORE_RAIL_INDICATOR BIT(7)
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#define REG_PHASE_REPORTING 0xf4
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struct max16601_data {
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struct pmbus_driver_info info;
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struct i2c_client *vsa;
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int iout_avg_pkg;
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};
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#define to_max16601_data(x) container_of(x, struct max16601_data, info)
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static int max16601_read_byte(struct i2c_client *client, int page, int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct max16601_data *data = to_max16601_data(info);
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if (page > 0) {
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if (page == 2) /* VSA */
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return i2c_smbus_read_byte_data(data->vsa, reg);
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return -EOPNOTSUPP;
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}
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return -ENODATA;
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}
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static int max16601_read_word(struct i2c_client *client, int page, int phase,
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int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct max16601_data *data = to_max16601_data(info);
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u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
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int ret;
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switch (page) {
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case 0: /* VCORE */
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if (phase == 0xff)
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return -ENODATA;
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switch (reg) {
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case PMBUS_READ_IIN:
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case PMBUS_READ_IOUT:
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case PMBUS_READ_TEMPERATURE_1:
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ret = i2c_smbus_write_byte_data(client, REG_PHASE_ID,
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phase);
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if (ret)
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return ret;
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ret = i2c_smbus_read_block_data(client,
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REG_PHASE_REPORTING,
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buf);
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if (ret < 0)
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return ret;
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if (ret < 6)
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return -EIO;
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switch (reg) {
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case PMBUS_READ_TEMPERATURE_1:
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return buf[1] << 8 | buf[0];
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case PMBUS_READ_IOUT:
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return buf[3] << 8 | buf[2];
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case PMBUS_READ_IIN:
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return buf[5] << 8 | buf[4];
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default:
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break;
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}
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}
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return -EOPNOTSUPP;
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case 1: /* VCORE, read IIN/PIN from sensor element */
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switch (reg) {
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case PMBUS_READ_IIN:
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return i2c_smbus_read_word_data(client, REG_IIN_SENSOR);
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case PMBUS_READ_PIN:
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return i2c_smbus_read_word_data(client,
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REG_TOTAL_INPUT_POWER);
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default:
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break;
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}
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return -EOPNOTSUPP;
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case 2: /* VSA */
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switch (reg) {
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case PMBUS_VIRT_READ_IOUT_MAX:
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ret = i2c_smbus_read_word_data(data->vsa,
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REG_IOUT_AVG_PK);
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if (ret < 0)
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return ret;
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if (sign_extend32(ret, 10) >
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sign_extend32(data->iout_avg_pkg, 10))
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data->iout_avg_pkg = ret;
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return data->iout_avg_pkg;
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case PMBUS_VIRT_RESET_IOUT_HISTORY:
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return 0;
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case PMBUS_IOUT_OC_FAULT_LIMIT:
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case PMBUS_IOUT_OC_WARN_LIMIT:
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case PMBUS_OT_FAULT_LIMIT:
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case PMBUS_OT_WARN_LIMIT:
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case PMBUS_READ_IIN:
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case PMBUS_READ_IOUT:
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case PMBUS_READ_TEMPERATURE_1:
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case PMBUS_STATUS_WORD:
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return i2c_smbus_read_word_data(data->vsa, reg);
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default:
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return -EOPNOTSUPP;
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}
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default:
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return -EOPNOTSUPP;
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}
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}
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static int max16601_write_byte(struct i2c_client *client, int page, u8 reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct max16601_data *data = to_max16601_data(info);
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if (page == 2) {
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if (reg == PMBUS_CLEAR_FAULTS)
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return i2c_smbus_write_byte(data->vsa, reg);
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return -EOPNOTSUPP;
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}
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return -ENODATA;
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}
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static int max16601_write_word(struct i2c_client *client, int page, int reg,
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u16 value)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct max16601_data *data = to_max16601_data(info);
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switch (page) {
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case 0: /* VCORE */
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return -ENODATA;
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case 1: /* VCORE IIN/PIN from sensor element */
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default:
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return -EOPNOTSUPP;
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case 2: /* VSA */
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switch (reg) {
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case PMBUS_VIRT_RESET_IOUT_HISTORY:
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data->iout_avg_pkg = 0xfc00;
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return 0;
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case PMBUS_IOUT_OC_FAULT_LIMIT:
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case PMBUS_IOUT_OC_WARN_LIMIT:
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case PMBUS_OT_FAULT_LIMIT:
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case PMBUS_OT_WARN_LIMIT:
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return i2c_smbus_write_word_data(data->vsa, reg, value);
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default:
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return -EOPNOTSUPP;
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}
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}
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}
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static int max16601_identify(struct i2c_client *client,
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struct pmbus_driver_info *info)
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{
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int reg;
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reg = i2c_smbus_read_byte_data(client, REG_SETPT_DVID);
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if (reg < 0)
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return reg;
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if (reg & DAC_10MV_MODE)
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info->vrm_version[0] = vr13;
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else
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info->vrm_version[0] = vr12;
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return 0;
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}
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static struct pmbus_driver_info max16601_info = {
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.pages = 3,
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.format[PSC_VOLTAGE_IN] = linear,
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.format[PSC_VOLTAGE_OUT] = vid,
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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_IIN | PMBUS_HAVE_PIN |
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PMBUS_HAVE_STATUS_INPUT |
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PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
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PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
|
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PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
|
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PMBUS_HAVE_POUT | PMBUS_PAGE_VIRTUAL | PMBUS_PHASE_VIRTUAL,
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.func[1] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | PMBUS_PAGE_VIRTUAL,
|
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.func[2] = PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT |
|
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PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
|
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PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_PAGE_VIRTUAL,
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.phases[0] = 8,
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.pfunc[0] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP,
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.pfunc[1] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT,
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.pfunc[2] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP,
|
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.pfunc[3] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT,
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.pfunc[4] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP,
|
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.pfunc[5] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT,
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.pfunc[6] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP,
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.pfunc[7] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT,
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.identify = max16601_identify,
|
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.read_byte_data = max16601_read_byte,
|
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.read_word_data = max16601_read_word,
|
||||
.write_byte = max16601_write_byte,
|
||||
.write_word_data = max16601_write_word,
|
||||
};
|
||||
|
||||
static void max16601_remove(void *_data)
|
||||
{
|
||||
struct max16601_data *data = _data;
|
||||
|
||||
i2c_unregister_device(data->vsa);
|
||||
}
|
||||
|
||||
static int max16601_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct device *dev = &client->dev;
|
||||
u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
|
||||
struct max16601_data *data;
|
||||
int ret;
|
||||
|
||||
if (!i2c_check_functionality(client->adapter,
|
||||
I2C_FUNC_SMBUS_READ_BYTE_DATA |
|
||||
I2C_FUNC_SMBUS_READ_BLOCK_DATA))
|
||||
return -ENODEV;
|
||||
|
||||
ret = i2c_smbus_read_block_data(client, PMBUS_IC_DEVICE_ID, buf);
|
||||
if (ret < 0)
|
||||
return -ENODEV;
|
||||
|
||||
/* PMBUS_IC_DEVICE_ID is expected to return "MAX16601y.xx" */
|
||||
if (ret < 11 || strncmp(buf, "MAX16601", 8)) {
|
||||
buf[ret] = '\0';
|
||||
dev_err(dev, "Unsupported chip '%s'\n", buf);
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
ret = i2c_smbus_read_byte_data(client, REG_PHASE_ID);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
if (!(ret & CORE_RAIL_INDICATOR)) {
|
||||
dev_err(dev,
|
||||
"Driver must be instantiated on CORE rail I2C address\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
|
||||
if (!data)
|
||||
return -ENOMEM;
|
||||
|
||||
data->iout_avg_pkg = 0xfc00;
|
||||
data->vsa = i2c_new_dummy_device(client->adapter, client->addr + 1);
|
||||
if (IS_ERR(data->vsa)) {
|
||||
dev_err(dev, "Failed to register VSA client\n");
|
||||
return PTR_ERR(data->vsa);
|
||||
}
|
||||
ret = devm_add_action_or_reset(dev, max16601_remove, data);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
data->info = max16601_info;
|
||||
|
||||
return pmbus_do_probe(client, id, &data->info);
|
||||
}
|
||||
|
||||
static const struct i2c_device_id max16601_id[] = {
|
||||
{"max16601", 0},
|
||||
{}
|
||||
};
|
||||
|
||||
MODULE_DEVICE_TABLE(i2c, max16601_id);
|
||||
|
||||
static struct i2c_driver max16601_driver = {
|
||||
.driver = {
|
||||
.name = "max16601",
|
||||
},
|
||||
.probe = max16601_probe,
|
||||
.remove = pmbus_do_remove,
|
||||
.id_table = max16601_id,
|
||||
};
|
||||
|
||||
module_i2c_driver(max16601_driver);
|
||||
|
||||
MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
|
||||
MODULE_DESCRIPTION("PMBus driver for Maxim MAX16601");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
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