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The input voltage, output voltage, input current, output current, input power, output power and temperature of per rail can be obtained from hwmon sysfs that the driver provided. Signed-off-by: Noah Wang --- Documentation/hwmon/mp2891.rst | 95 +++++++++++++++ drivers/hwmon/pmbus/Kconfig | 9 ++ drivers/hwmon/pmbus/Makefile | 1 + drivers/hwmon/pmbus/mp2891.c | 210 +++++++++++++++++++++++++++++++++ 4 files changed, 315 insertions(+) create mode 100644 Documentation/hwmon/mp2891.rst create mode 100644 drivers/hwmon/pmbus/mp2891.c -- 2.25.1 diff --git a/Documentation/hwmon/mp2891.rst b/Documentation/hwmon/mp2891.rst new file mode 100644 index 000000000..eaf73fe60 --- /dev/null +++ b/Documentation/hwmon/mp2891.rst @@ -0,0 +1,95 @@ +.. SPDX-License-Identifier: GPL-2.0 + +Kernel driver mp2891 +==================== + +Supported chips: + + * MPS mp2891 + + Prefix: 'mp2891' + + * Datasheet + + Publicly available at the MPS website : https://www.monolithicpower.com/en/mp2891.html + +Author: + + Noah Wang + +Description +----------- + +This driver implements support for Monolithic Power Systems, Inc. (MPS) +MP2891 Multi-phase Digital VR Controller. + +Device compliant with: + +- PMBus rev 1.3 interface. + +Device supports direct and linear format for reading input voltage, +output voltage, input currect, output current, input power, output +power, and temperature. + +The driver exports the following attributes via the 'sysfs' files +for input voltage: + +**in1_input** + +**in1_label** + +The driver provides the following attributes for output voltage: + +**in2_input** + +**in2_label** + +**in3_input** + +**in3_label** + +The driver provides the following attributes for input current: + +**curr1_input** + +**curr1_label** + +**curr2_input** + +**curr2_label** + +The driver provides the following attributes for output current: + +**curr3_input** + +**curr3_label** + +**curr4_input** + +**curr4_label** + +The driver provides the following attributes for input power: + +**power1_input** + +**power1_label** + +**power2_input** + +**power2_label** + +The driver provides the following attributes for output power: + +**power3_input** + +**power3_label** + +**power4_input** + +**power4_label** + +The driver provides the following attributes for temperature: + +**temp1_input** + +**temp2_input** diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index 557ae0c41..b8b6c7724 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -361,6 +361,15 @@ config SENSORS_MP5990 This driver can also be built as a module. If so, the module will be called mp5990. +config SENSORS_MP2891 + tristate "MPS MP2891" + help + If you say yes here you get hardware monitoring support for MPS + MP2891 Dual Loop Digital Multi-Phase Controller. + + This driver can also be built as a module. If so, the module will + be called mp2891. + config SENSORS_MPQ7932_REGULATOR bool "Regulator support for MPQ7932" depends on SENSORS_MPQ7932 && REGULATOR diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile index f14ecf03a..57b91c20e 100644 --- a/drivers/hwmon/pmbus/Makefile +++ b/drivers/hwmon/pmbus/Makefile @@ -38,6 +38,7 @@ obj-$(CONFIG_SENSORS_MP2888) += mp2888.o obj-$(CONFIG_SENSORS_MP2975) += mp2975.o obj-$(CONFIG_SENSORS_MP5023) += mp5023.o obj-$(CONFIG_SENSORS_MP5990) += mp5990.o +obj-$(CONFIG_SENSORS_MP2891) += mp2891.o obj-$(CONFIG_SENSORS_MPQ7932) += mpq7932.o obj-$(CONFIG_SENSORS_MPQ8785) += mpq8785.o obj-$(CONFIG_SENSORS_PLI1209BC) += pli1209bc.o diff --git a/drivers/hwmon/pmbus/mp2891.c b/drivers/hwmon/pmbus/mp2891.c new file mode 100644 index 000000000..c98d9ec6b --- /dev/null +++ b/drivers/hwmon/pmbus/mp2891.c @@ -0,0 +1,210 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Hardware monitoring driver for MPS Multi-phase Digital VR Controllers(MP2891) + */ + +#include +#include +#include +#include +#include +#include "pmbus.h" + +/* Vendor specific registers, the register READ_PIN_EST(0x94), + * MFR_VOUT_LOOP_CTRL(0xBD) and READ_IIN_EST(0x95) redefine + * the standard PMBUS register. + */ +#define MFR_VOUT_LOOP_CTRL 0xBD +#define READ_PIN_EST 0x94 +#define READ_IIN_EST 0x95 + +#define MP2891_PAGE_NUM 2 + +#define MP2891_RAIL1_FUNC (PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | \ + PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP | \ + PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | \ + PMBUS_HAVE_IIN | PMBUS_PHASE_VIRTUAL) + +#define MP2891_RAIL2_FUNC (PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | \ + PMBUS_HAVE_TEMP | PMBUS_HAVE_POUT | \ + PMBUS_HAVE_IIN | PMBUS_PHASE_VIRTUAL) + +struct mp2891_data { + struct pmbus_driver_info info; +}; + +#define to_mp2891_data(x) container_of(x, struct mp2891_data, info) + +static int mp2891_read_byte_data(struct i2c_client *client, int page, int reg) +{ + int ret; + + switch (reg) { + case PMBUS_VOUT_MODE: + ret = PB_VOUT_MODE_DIRECT; + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} + +static int mp2891_read_word_data(struct i2c_client *client, int page, int phase, + int reg) +{ + int ret; + + switch (reg) { + case PMBUS_READ_VIN: + case PMBUS_READ_IOUT: + case PMBUS_READ_POUT: + case PMBUS_READ_VOUT: + case PMBUS_READ_TEMPERATURE_1: + ret = pmbus_read_word_data(client, page, phase, reg); + break; + case PMBUS_READ_IIN: + ret = pmbus_read_word_data(client, page, phase, READ_IIN_EST); + break; + case PMBUS_READ_PIN: + ret = pmbus_read_word_data(client, page, phase, READ_PIN_EST); + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} + +static int +mp2891_identify_vout_scale(struct i2c_client *client, struct mp2891_data *data, + u32 reg, int page) +{ + int ret; + + ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page); + if (ret < 0) + return ret; + + ret = i2c_smbus_read_word_data(client, reg); + if (ret < 0) + return ret; + + /* + * Obtain vout scale from the register MFR_VOUT_LOOP_CTRL, bits 15-14,bit 13. + * If MFR_VOUT_LOOP_CTRL[13] = 1, the vout scale is below: + * 2.5mV/LSB + * If MFR_VOUT_LOOP_CTRL[13] = 0, the vout scale is decided by + * MFR_VOUT_LOOP_CTRL[15:14]: + * 00b - 6.25mV/LSB, 01b - 5mV/LSB, 10b - 2mV/LSB, 11b - 1mV + */ + if (ret & GENMASK(13, 13)) { + data->info.m[PSC_VOLTAGE_OUT] = 4; + data->info.R[PSC_VOLTAGE_OUT] = -1; + data->info.b[PSC_VOLTAGE_OUT] = 0; + } else { + ret = (ret & GENMASK(15, 14)) >> 14; + if (ret == 0) { + data->info.m[PSC_VOLTAGE_OUT] = 16; + data->info.R[PSC_VOLTAGE_OUT] = -2; + data->info.b[PSC_VOLTAGE_OUT] = 0; + } else if (ret == 1) { + data->info.m[PSC_VOLTAGE_OUT] = 2; + data->info.R[PSC_VOLTAGE_OUT] = -1; + data->info.b[PSC_VOLTAGE_OUT] = 0; + } else if (ret == 2) { + data->info.m[PSC_VOLTAGE_OUT] = 5; + data->info.R[PSC_VOLTAGE_OUT] = -1; + data->info.b[PSC_VOLTAGE_OUT] = 0; + } else { + data->info.m[PSC_VOLTAGE_OUT] = 1; + data->info.R[PSC_VOLTAGE_OUT] = 0; + data->info.b[PSC_VOLTAGE_OUT] = 0; + } + } + + return 0; +} + +static int +mp2891_identify_rails_vout_scale(struct i2c_client *client, struct mp2891_data *data) +{ + int ret; + + /* Identify vout scale from register MFR_VOUT_LOOP_CTRL. */ + /* Identify vout scale for rail 1. */ + ret = mp2891_identify_vout_scale(client, data, MFR_VOUT_LOOP_CTRL, 0); + if (ret < 0) + return ret; + + /* Identify vout scale for rail 2. */ + ret = mp2891_identify_vout_scale(client, data, MFR_VOUT_LOOP_CTRL, 1); + + return ret; +} + +static struct pmbus_driver_info mp2891_info = { + .pages = MP2891_PAGE_NUM, + .format[PSC_VOLTAGE_IN] = linear, + .format[PSC_CURRENT_IN] = linear, + .format[PSC_CURRENT_OUT] = linear, + .format[PSC_TEMPERATURE] = linear, + .format[PSC_POWER] = linear, + .format[PSC_VOLTAGE_OUT] = direct, + + .func[0] = MP2891_RAIL1_FUNC, + .func[1] = MP2891_RAIL2_FUNC, + .read_word_data = mp2891_read_word_data, + .read_byte_data = mp2891_read_byte_data, +}; + +static int mp2891_probe(struct i2c_client *client) +{ + struct pmbus_driver_info *info; + struct mp2891_data *data; + int ret; + + data = devm_kzalloc(&client->dev, sizeof(struct mp2891_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + memcpy(&data->info, &mp2891_info, sizeof(*info)); + info = &data->info; + + /* Identify vout scale per rail. */ + ret = mp2891_identify_rails_vout_scale(client, data); + if (ret < 0) + return ret; + + return pmbus_do_probe(client, info); +} + +static const struct i2c_device_id mp2891_id[] = { + {"mp2891", 0}, + {} +}; +MODULE_DEVICE_TABLE(i2c, mp2891_id); + +static const struct of_device_id __maybe_unused mp2891_of_match[] = { + {.compatible = "mps,mp2891"}, + {} +}; +MODULE_DEVICE_TABLE(of, mp2891_of_match); + +static struct i2c_driver mp2891_driver = { + .driver = { + .name = "mp2891", + .of_match_table = mp2891_of_match, + }, + .probe = mp2891_probe, + .id_table = mp2891_id, +}; + +module_i2c_driver(mp2891_driver); + +MODULE_AUTHOR("Noah Wang "); +MODULE_DESCRIPTION("PMBus driver for MPS MP2891 device"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(PMBUS);