From ca2cf35544926dd668b28f63a5babb8dc36a26d6 Mon Sep 17 00:00:00 2001 From: Yuxi Wang Date: Fri, 19 Dec 2025 13:54:13 +0800 Subject: [PATCH] hwmon: (pmbus) Add mp5926 driver Add support for mps mp5926. Signed-off-by: Yuxi Wang Link: https://lore.kernel.org/r/20251219055413.1661-3-Yuxi.Wang@monolithicpower.com [groeck: Use consistent comment style, and use return value from dev_err_probe()] Signed-off-by: Guenter Roeck --- Documentation/hwmon/index.rst | 1 + Documentation/hwmon/mp5926.rst | 92 +++++++++++++++++ MAINTAINERS | 7 ++ drivers/hwmon/pmbus/Kconfig | 9 ++ drivers/hwmon/pmbus/Makefile | 1 + drivers/hwmon/pmbus/mp5926.c | 184 +++++++++++++++++++++++++++++++++ 6 files changed, 294 insertions(+) create mode 100644 Documentation/hwmon/mp5926.rst create mode 100644 drivers/hwmon/pmbus/mp5926.c diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index 85d7a686883ec..6181c3f62177e 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -185,6 +185,7 @@ Hardware Monitoring Kernel Drivers mp2993 mp5023 mp5920 + mp5926 mp5990 mp9941 mp9945 diff --git a/Documentation/hwmon/mp5926.rst b/Documentation/hwmon/mp5926.rst new file mode 100644 index 0000000000000..4b64a7e24ae69 --- /dev/null +++ b/Documentation/hwmon/mp5926.rst @@ -0,0 +1,92 @@ +.. SPDX-License-Identifier: GPL-2.0 + +Kernel driver mp5926 +==================== + +Supported chips: + + * MPS mp5926 + + Prefix: 'mp5926' + + * Datasheet + https://www.monolithicpower.com/en/ + +Author: + + Yuxi Wang + +Description +----------- + +This driver implements support for Monolithic Power Systems, Inc. (MPS) +MP5926 Hot-Swap Controller. + +Device compliant with: + +- PMBus rev 1.3 interface. + +The driver exports the following attributes via the 'sysfs' files +for input voltage: + +**in1_input** + +**in1_label** + +**in1_crit** + +**in1_crit_alarm** + +The driver provides the following attributes for output voltage: + +**in2_input** + +**in2_label** + +**in2_lcrit** + +**in2_lcrit_alarm** + +**in2_rated_max** + +**in2_rated_min** + +The driver provides the following attributes for input current: + +**curr1_input** + +**curr1_label** + +**curr1_max** + +**curr1_max_alarm** + +The driver provides the following attributes for output current: + +**curr2_input** + +**curr2_label** + +The driver provides the following attributes for input power: + +**power1_input** + +**power1_label** + +The driver provides the following attributes for output power: + +**power2_input** + +**power2_label** + +The driver provides the following attributes for temperature: + +**temp1_input** + +**temp1_crit** + +**temp1_crit_alarm** + +**temp1_max** + +**temp1_max_alarm** diff --git a/MAINTAINERS b/MAINTAINERS index 0d044a58cbfe0..126cbc6668a1e 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -17736,6 +17736,13 @@ S: Maintained F: Documentation/hwmon/mp2993.rst F: drivers/hwmon/pmbus/mp2993.c +MPS MP5926 DRIVER +M: Yuxi Wang +L: linux-hwmon@vger.kernel.org +S: Maintained +F: Documentation/hwmon/mp5926.rst +F: drivers/hwmon/pmbus/mp5926.c + MPS MP9941 DRIVER M: Noah Wang L: linux-hwmon@vger.kernel.org diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index f3fb94cebf1ad..d0aa460abdc9d 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -472,6 +472,15 @@ config SENSORS_MP5920 This driver can also be built as a module. If so, the module will be called mp5920. +config SENSORS_MP5926 + tristate "MPS MP5926" + help + If you say yes here you get hardware monitoring support for Monolithic + MP5926. + + This driver can also be built as a module. If so, the module will + be called mp5926. + config SENSORS_MP5990 tristate "MPS MP5990" help diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile index 349a89b6d92eb..75ec4956ca8d4 100644 --- a/drivers/hwmon/pmbus/Makefile +++ b/drivers/hwmon/pmbus/Makefile @@ -47,6 +47,7 @@ obj-$(CONFIG_SENSORS_MP2975) += mp2975.o obj-$(CONFIG_SENSORS_MP2993) += mp2993.o obj-$(CONFIG_SENSORS_MP5023) += mp5023.o obj-$(CONFIG_SENSORS_MP5920) += mp5920.o +obj-$(CONFIG_SENSORS_MP5926) += mp5926.o obj-$(CONFIG_SENSORS_MP5990) += mp5990.o obj-$(CONFIG_SENSORS_MP9941) += mp9941.o obj-$(CONFIG_SENSORS_MP9945) += mp9945.o diff --git a/drivers/hwmon/pmbus/mp5926.c b/drivers/hwmon/pmbus/mp5926.c new file mode 100644 index 0000000000000..f0d1b30c70134 --- /dev/null +++ b/drivers/hwmon/pmbus/mp5926.c @@ -0,0 +1,184 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * mp5926.c - pmbus driver for mps mp5926 + * + * Copyright 2025 Monolithic Power Systems, Inc + * + * Author: Yuxi Wang + */ + +#include +#include +#include +#include +#include +#include +#include "pmbus.h" + +#define PAGE 0x01 +#define EFUSE_CFG 0xCF +#define I_SCALE_SEL 0xC6 +#define MP5926_FUNC (PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | \ + PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | \ + PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_INPUT | \ + PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_VOUT) + +struct mp5926_data { + struct pmbus_driver_info info; + u8 vout_mode; + u8 vout_linear_exponent; +}; + +#define to_mp5926_data(x) container_of(x, struct mp5926_data, info) + +static int mp5926_read_byte_data(struct i2c_client *client, int page, + int reg) +{ + const struct pmbus_driver_info *info = pmbus_get_driver_info(client); + struct mp5926_data *data = to_mp5926_data(info); + int ret; + + switch (reg) { + case PMBUS_VOUT_MODE: + if (data->vout_mode == linear) { + /* + * The VOUT format used by the chip is linear11, + * not linear16. Report that VOUT is in linear mode + * and return exponent value extracted while probing + * the chip. + */ + return data->vout_linear_exponent; + } + return PB_VOUT_MODE_DIRECT; + default: + ret = -ENODATA; + break; + } + return ret; +} + +static int mp5926_read_word_data(struct i2c_client *client, int page, int phase, + int reg) +{ + const struct pmbus_driver_info *info = pmbus_get_driver_info(client); + struct mp5926_data *data = to_mp5926_data(info); + int ret; + + switch (reg) { + case PMBUS_READ_VOUT: + ret = pmbus_read_word_data(client, page, phase, reg); + if (ret < 0) + return ret; + /* + * Because the VOUT format used by the chip is linear11 and not + * linear16, we disregard bits[15:11]. The exponent is reported + * as part of the VOUT_MODE command. + */ + if (data->vout_mode == linear) + ret = ((s16)((ret & 0x7ff) << 5)) >> 5; + break; + default: + ret = -ENODATA; + break; + } + return ret; +} + +static struct pmbus_driver_info mp5926_info = { + .pages = PAGE, + .format[PSC_VOLTAGE_IN] = direct, + .format[PSC_CURRENT_IN] = direct, + .format[PSC_VOLTAGE_OUT] = direct, + .format[PSC_TEMPERATURE] = direct, + .format[PSC_POWER] = direct, + + .m[PSC_VOLTAGE_IN] = 16, + .b[PSC_VOLTAGE_IN] = 0, + .R[PSC_VOLTAGE_IN] = 0, + + .m[PSC_CURRENT_IN] = 16, + .b[PSC_CURRENT_IN] = 0, + .R[PSC_CURRENT_IN] = 0, + + .m[PSC_VOLTAGE_OUT] = 16, + .b[PSC_VOLTAGE_OUT] = 0, + .R[PSC_VOLTAGE_OUT] = 0, + + .m[PSC_TEMPERATURE] = 4, + .b[PSC_TEMPERATURE] = 0, + .R[PSC_TEMPERATURE] = 0, + + .m[PSC_POWER] = 25, + .b[PSC_POWER] = 0, + .R[PSC_POWER] = -2, + + .read_word_data = mp5926_read_word_data, + .read_byte_data = mp5926_read_byte_data, + .func[0] = MP5926_FUNC, +}; + +static int mp5926_probe(struct i2c_client *client) +{ + struct mp5926_data *data; + struct pmbus_driver_info *info; + int ret; + + data = devm_kzalloc(&client->dev, sizeof(struct mp5926_data), + GFP_KERNEL); + if (!data) + return -ENOMEM; + + memcpy(&data->info, &mp5926_info, sizeof(*info)); + info = &data->info; + ret = i2c_smbus_read_word_data(client, EFUSE_CFG); + if (ret < 0) + return ret; + if (ret & BIT(12)) { + data->vout_mode = linear; + data->info.format[PSC_VOLTAGE_IN] = linear; + data->info.format[PSC_CURRENT_IN] = linear; + data->info.format[PSC_VOLTAGE_OUT] = linear; + data->info.format[PSC_TEMPERATURE] = linear; + data->info.format[PSC_POWER] = linear; + ret = i2c_smbus_read_word_data(client, PMBUS_READ_VOUT); + if (ret < 0) + return dev_err_probe(&client->dev, ret, "Can't get vout exponent."); + data->vout_linear_exponent = (u8)((ret >> 11) & 0x1f); + } else { + data->vout_mode = direct; + ret = i2c_smbus_read_word_data(client, I_SCALE_SEL); + if (ret < 0) + return ret; + if (ret & BIT(6)) + data->info.m[PSC_CURRENT_IN] = 4; + } + + return pmbus_do_probe(client, info); +} + +static const struct i2c_device_id mp5926_id[] = { + { "mp5926", 0 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, mp5926_id); + +static const struct of_device_id mp5926_of_match[] = { + { .compatible = "mps,mp5926" }, + {} +}; +MODULE_DEVICE_TABLE(of, mp5926_of_match); + +static struct i2c_driver mp5926_driver = { + .probe = mp5926_probe, + .driver = { + .name = "mp5926", + .of_match_table = mp5926_of_match, + }, + .id_table = mp5926_id, +}; + +module_i2c_driver(mp5926_driver); +MODULE_AUTHOR("Yuxi Wang "); +MODULE_DESCRIPTION("MPS MP5926 pmbus driver"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS("PMBUS"); -- 2.47.3