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hwmon: (pmbus) Add ltc4286 driver
Add a driver to support ltc4286 chip Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@Wiwynn.com> Link: https://lore.kernel.org/r/20231123015440.199822-3-Delphine_CC_Chiu@Wiwynn.com [groeck: Fixed formatting] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Delphine CC Chiu
Guenter Roeck
parent
7707cf82e1
commit
0c459759ca
@ -128,6 +128,7 @@ Hardware Monitoring Kernel Drivers
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ltc4245
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ltc4260
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ltc4261
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ltc4286
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max127
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max15301
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max16064
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95
Documentation/hwmon/ltc4286.rst
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95
Documentation/hwmon/ltc4286.rst
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@ -0,0 +1,95 @@
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.. SPDX-License-Identifier: GPL-2.0-or-later
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Kernel driver ltc4286
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=====================
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Supported chips:
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* Analog Devices LTC4286
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Prefix: 'ltc4286'
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Addresses scanned: -
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Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4286.pdf
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* Analog Devices LTC4287
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Prefix: 'ltc4287'
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Addresses scanned: -
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Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4287.pdf
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Author: Delphine CC Chiu <Delphine_CC_Chiu@Wiwynn.com>
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Description
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-----------
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This driver supports hardware monitoring for Analog Devices LTC4286
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and LTC4287 Hot-Swap Controller and Digital Power Monitors.
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LTC4286 and LTC4287 are hot-swap controllers that allow a circuit board
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to be removed from or inserted into a live backplane. They also feature
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current and voltage readback via an integrated 12 bit analog-to-digital
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converter (ADC), accessed using a PMBus interface.
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The driver is a client driver to the core PMBus driver. Please see
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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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The shunt value in micro-ohms can be set via device tree at compile-time. Please
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refer to the Documentation/devicetree/bindings/hwmon/lltc,ltc4286.yaml for bindings
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if the device tree is used.
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Platform data support
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---------------------
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The driver supports standard PMBus driver platform data. Please see
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Documentation/hwmon/pmbus.rst for details.
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Sysfs entries
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-------------
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The following attributes are supported. Limits are read-write, history reset
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attributes are write-only, all other attributes are read-only.
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======================= =======================================================
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in1_label "vin"
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in1_input Measured voltage.
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in1_alarm Input voltage alarm.
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in1_min Minimum input voltage.
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in1_max Maximum input voltage.
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in2_label "vout1"
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in2_input Measured voltage.
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in2_alarm Output voltage alarm.
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in2_min Minimum output voltage.
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in2_max Maximum output voltage.
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curr1_label "iout1"
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curr1_input Measured current.
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curr1_alarm Output current alarm.
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curr1_max Maximum current.
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power1_label "pin"
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power1_input Input power.
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power1_alarm Input power alarm.
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power1_max Maximum poewr.
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temp1_input Chip temperature.
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temp1_min Minimum chip temperature.
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temp1_max Maximum chip temperature.
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temp1_crit Critical chip temperature.
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temp1_alarm Chip temperature alarm.
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======================= =======================================================
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@ -227,6 +227,16 @@ config SENSORS_LTC3815
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This driver can also be built as a module. If so, the module will
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be called ltc3815.
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config SENSORS_LTC4286
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bool "Analog Devices LTC4286"
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help
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LTC4286 is an integrated solution for hot swap applications that
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allows a board to be safely inserted and removed from a live
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backplane.
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This chip could be used to monitor voltage, current, ...etc.
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If you say yes here you get hardware monitoring support for Analog
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Devices LTC4286.
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config SENSORS_MAX15301
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tristate "Maxim MAX15301"
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help
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@ -24,6 +24,7 @@ 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-$(CONFIG_SENSORS_LTC4286) += ltc4286.o
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obj-$(CONFIG_SENSORS_MAX15301) += max15301.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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175
drivers/hwmon/pmbus/ltc4286.c
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175
drivers/hwmon/pmbus/ltc4286.c
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@ -0,0 +1,175 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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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/pmbus.h>
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#include "pmbus.h"
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/* LTC4286 register */
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#define LTC4286_MFR_CONFIG1 0xF2
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/* LTC4286 configuration */
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#define VRANGE_SELECT_BIT BIT(1)
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#define LTC4286_MFR_ID_SIZE 3
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/*
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* Initialize the MBR as default settings which is referred to LTC4286 datasheet
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* (March 22, 2022 version) table 3 page 16
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*/
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static struct pmbus_driver_info ltc4286_info = {
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.pages = 1,
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.format[PSC_VOLTAGE_IN] = direct,
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.format[PSC_VOLTAGE_OUT] = direct,
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.format[PSC_CURRENT_OUT] = direct,
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.format[PSC_POWER] = direct,
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.format[PSC_TEMPERATURE] = direct,
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.m[PSC_VOLTAGE_IN] = 32,
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.b[PSC_VOLTAGE_IN] = 0,
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.R[PSC_VOLTAGE_IN] = 1,
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.m[PSC_VOLTAGE_OUT] = 32,
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.b[PSC_VOLTAGE_OUT] = 0,
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.R[PSC_VOLTAGE_OUT] = 1,
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.m[PSC_CURRENT_OUT] = 1024,
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.b[PSC_CURRENT_OUT] = 0,
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/*
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* The rsense value used in MBR formula in LTC4286 datasheet should be ohm unit.
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* However, the rsense value that user input is micro ohm.
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* Thus, the MBR setting which involves rsense should be shifted by 6 digits.
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*/
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.R[PSC_CURRENT_OUT] = 3 - 6,
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.m[PSC_POWER] = 1,
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.b[PSC_POWER] = 0,
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/*
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* The rsense value used in MBR formula in LTC4286 datasheet should be ohm unit.
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* However, the rsense value that user input is micro ohm.
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* Thus, the MBR setting which involves rsense should be shifted by 6 digits.
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*/
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.R[PSC_POWER] = 4 - 6,
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.m[PSC_TEMPERATURE] = 1,
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.b[PSC_TEMPERATURE] = 273,
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.R[PSC_TEMPERATURE] = 0,
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.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
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PMBUS_HAVE_PIN | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_VOUT |
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PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_TEMP,
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};
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static const struct i2c_device_id ltc4286_id[] = {
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{ "ltc4286", 0 },
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{ "ltc4287", 1 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, ltc4286_id);
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static int ltc4286_probe(struct i2c_client *client)
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{
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int ret;
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const struct i2c_device_id *mid;
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u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
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struct pmbus_driver_info *info;
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u32 rsense;
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int vrange_nval, vrange_oval;
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ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer);
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if (ret < 0) {
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return dev_err_probe(&client->dev, ret,
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"Failed to read manufacturer id\n");
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}
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/*
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* Refer to ltc4286 datasheet page 20
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* the manufacturer id is LTC
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*/
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if (ret != LTC4286_MFR_ID_SIZE ||
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strncmp(block_buffer, "LTC", LTC4286_MFR_ID_SIZE)) {
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return dev_err_probe(&client->dev, -ENODEV,
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"Manufacturer id mismatch\n");
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}
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ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer);
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if (ret < 0) {
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return dev_err_probe(&client->dev, ret,
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"Failed to read manufacturer model\n");
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}
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for (mid = ltc4286_id; mid->name[0]; mid++) {
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if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
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break;
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}
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if (!mid->name[0])
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return dev_err_probe(&client->dev, -ENODEV,
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"Unsupported device\n");
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if (of_property_read_u32(client->dev.of_node,
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"shunt-resistor-micro-ohms", &rsense))
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rsense = 300; /* 0.3 mOhm if not set via DT */
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if (rsense == 0)
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return -EINVAL;
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/* Check for the latter MBR value won't overflow */
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if (rsense > (INT_MAX / 1024))
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return -EINVAL;
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info = devm_kmemdup(&client->dev, <c4286_info, sizeof(*info),
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GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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/* Check MFR1 CONFIG register bit 1 VRANGE_SELECT before driver loading */
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vrange_oval = i2c_smbus_read_word_data(client, LTC4286_MFR_CONFIG1);
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if (vrange_oval < 0)
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return dev_err_probe(&client->dev, vrange_oval,
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"Failed to read manufacturer configuration one\n");
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vrange_nval = vrange_oval;
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if (device_property_read_bool(&client->dev, "adi,vrange-low-enable")) {
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vrange_nval &=
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~VRANGE_SELECT_BIT; /* VRANGE_SELECT = 0, 25.6 volts */
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info->m[PSC_VOLTAGE_IN] = 128;
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info->m[PSC_VOLTAGE_OUT] = 128;
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info->m[PSC_POWER] = 4 * rsense;
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} else {
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vrange_nval |=
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VRANGE_SELECT_BIT; /* VRANGE_SELECT = 1, 102.4 volts */
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info->m[PSC_POWER] = rsense;
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}
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if (vrange_nval != vrange_oval) {
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/* Set MFR1 CONFIG register bit 1 VRANGE_SELECT */
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ret = i2c_smbus_write_word_data(client, LTC4286_MFR_CONFIG1,
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vrange_nval);
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if (ret < 0)
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return dev_err_probe(&client->dev, ret,
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"Failed to set vrange\n");
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}
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info->m[PSC_CURRENT_OUT] = 1024 * rsense;
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return pmbus_do_probe(client, info);
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}
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static const struct of_device_id ltc4286_of_match[] = {
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{ .compatible = "lltc,ltc4286" },
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{ .compatible = "lltc,ltc4287" },
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{}
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};
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static struct i2c_driver ltc4286_driver = {
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.driver = {
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.name = "ltc4286",
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.of_match_table = ltc4286_of_match,
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},
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.probe = ltc4286_probe,
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.id_table = ltc4286_id,
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};
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module_i2c_driver(ltc4286_driver);
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MODULE_AUTHOR("Delphine CC Chiu <Delphine_CC_Chiu@wiwynn.com>");
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MODULE_DESCRIPTION("PMBUS driver for LTC4286 and compatibles");
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MODULE_LICENSE("GPL");
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