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Tue, 04 Mar 2025 03:08:44 -0800 (PST) Received: from [127.0.1.1] ([46.53.242.22]) by smtp.googlemail.com with ESMTPSA id 4fb4d7f45d1cf-5e4c3fb51e1sm8262041a12.61.2025.03.04.03.08.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Mar 2025 03:08:43 -0800 (PST) From: Dzmitry Sankouski Date: Tue, 04 Mar 2025 14:08:40 +0300 Subject: [PATCH v2] hwmon: (max77705) add initial support Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250304-initial-support-for-max77705-sensors-v2-1-58d2207c732b@gmail.com> X-B4-Tracking: v=1; b=H4sIADffxmcC/42OsQ6CMBRFf4V09pm2Wmqc/A/DUMoDXgIttoVgC P8uwuDqeM5wz11YxEAY2T1bWMCJInm3gTxlzLbGNQhUbcwkl4oLeQFylMh0EMdh8CFB7QP0ZtZ acwURXfQhgqm40NxYgVaxbWoIWNO8Z57FwQFf41ZLP9lSTD689yuT+NqjKqX6rzoJECBLzK+5z uWt5I+mN9Sdre9Zsa7rBx9gDRDtAAAA To: Jean Delvare , Guenter Roeck , Jonathan Corbet Cc: linux-hwmon@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Dzmitry Sankouski X-Mailer: b4 0.14.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1741086522; l=11567; i=dsankouski@gmail.com; s=20240619; h=from:subject:message-id; bh=4xkw0yYacB0/6Q5LwI8fkd9jTNv0eZdwxdKwCFqlyEc=; b=8IF6/x0sJWHtuL5LtWUNiphXXL3SiISj+3oqxNmfvm5zmngkg9prKJfjO3lxnVNOWb3y14jHV hqVRyO5AWuTC5m0ts/ev3/2GUJYowpiowP7WA+pGwhShCjsuEHpgUqC X-Developer-Key: i=dsankouski@gmail.com; a=ed25519; pk=YJcXFcN1EWrzBYuiE2yi5Mn6WLn6L1H71J+f7X8fMag= Add support for max77705 hwmon. Includes charger input, system bus, and vbyp measurements. Signed-off-by: Dzmitry Sankouski --- Maxim MAX77705 is a Companion Power Management and Type-C interface IC. It includes charger and fuel gauge blocks, and is capable of measuring charger input current, system bus volatage and current, and bypass voltage. Add support for mentioned measurements. --- Changes in v2: - EDITME: describe what is new in this series revision. - EDITME: use bulletpoints and terse descriptions. - Link to v1: https://lore.kernel.org/r/20250225-initial-support-for-max777= 05-sensors-v1-1-2be6467628b0@gmail.com --- Changes in v2: - sort headers alphabetically - swap curr channel info, to align indeces with channel_desc struct - reword coverletter - fix checkpatch --strict warnings - remove struct max77705_hwmon, use regmap directly - move register validation logic to is_visible function - move common register reading and converting logic to separate function - remove unnessesary {} in if statement - s/i2c->dev/pdev->dev in dev_err_probe --- Documentation/hwmon/index.rst | 1 + Documentation/hwmon/max77705.rst | 39 +++++++++++++++++++++++++++++++++++= ++++ MAINTAINERS | 7 +++++++ drivers/hwmon/Kconfig | 10 ++++++++++ drivers/hwmon/Makefile | 1 + drivers/hwmon/max77705-hwmon.c | 250 +++++++++++++++++++++++++++++++++++= +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++= +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++= +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 308 insertions(+) diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index 874f8fd26325..444c7865f74f 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -158,6 +158,7 @@ Hardware Monitoring Kernel Drivers max6639 max6650 max6697 + max77705 max8688 mc13783-adc mc34vr500 diff --git a/Documentation/hwmon/max77705.rst b/Documentation/hwmon/max7770= 5.rst new file mode 100644 index 000000000000..9037226c50b9 --- /dev/null +++ b/Documentation/hwmon/max77705.rst @@ -0,0 +1,39 @@ +.. SPDX-License-Identifier: GPL-2.0 + +Kernel driver max77705 +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +Supported chips: + + * Maxim Integrated MAX77705 + + Prefix: 'max77705' + + Addresses scanned: none + + Datasheet: Not available + +Authors: + - Dzmitry Sankouski + +Description +----------- + +The MAX77705 PMIC provides current and voltage measurements besides fuelga= uge: +- chip input current +- system bus current and voltage +- VBYP voltage + +Sysfs Attributes +---------------- + +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D +in1_label "vbyp" +in1_input Measured chip vbyp voltage +in2_label "vsys" +in2_input Measured chip system bus voltage +curr1_label "iin" +curr1_input Measured chip input current. +curr2_label "isys" +curr2_input Measured chip system bus current. +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D diff --git a/MAINTAINERS b/MAINTAINERS index 29e1a423eee5..0175f9f89325 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -18110,6 +18110,13 @@ S: Maintained F: Documentation/hwmon/pc87427.rst F: drivers/hwmon/pc87427.c =20 +MAX77705 HARDWARE MONITORING DRIVER +M: Dzmitry Sankouski +L: linux-hwmon@vger.kernel.org +S: Maintained +F: Documentation/hwmon/max77705.rst +F: drivers/hwmon/max77705-hwmon.c + PCA9532 LED DRIVER M: Riku Voipio S: Maintained diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 56494ab85b83..c86fe094a978 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1287,6 +1287,16 @@ config SENSORS_MAX31790 This driver can also be built as a module. If so, the module will be called max31790. =20 +config SENSORS_MAX77705 + tristate "MAX77705 current and voltage sensor" + depends on I2C + select REGMAP_I2C + help + If you say yes here you get support for MAX77705 sensors connected with= I2C. + + This driver can also be built as a module. If so, the module + will be called max77705-hwmon. + config SENSORS_MC34VR500 tristate "NXP MC34VR500 hardware monitoring driver" depends on I2C diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index b7ef0f0562d3..ff69f45eca50 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -159,6 +159,7 @@ obj-$(CONFIG_SENSORS_MAX6650) +=3D max6650.o obj-$(CONFIG_SENSORS_MAX6697) +=3D max6697.o obj-$(CONFIG_SENSORS_MAX31790) +=3D max31790.o obj-$(CONFIG_MAX31827) +=3D max31827.o +obj-$(CONFIG_SENSORS_MAX77705) +=3D max77705-hwmon.o obj-$(CONFIG_SENSORS_MC13783_ADC)+=3D mc13783-adc.o obj-$(CONFIG_SENSORS_MC34VR500) +=3D mc34vr500.o obj-$(CONFIG_SENSORS_MCP3021) +=3D mcp3021.o diff --git a/drivers/hwmon/max77705-hwmon.c b/drivers/hwmon/max77705-hwmon.c new file mode 100644 index 000000000000..6d2161421ac7 --- /dev/null +++ b/drivers/hwmon/max77705-hwmon.c @@ -0,0 +1,250 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * MAX77705 voltage and current hwmon driver. + * + * Copyright (C) 2025 Dzmitry Sankouski + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct channel_desc { + u8 reg; + u8 avg_reg; + const char *const label; + // register resolution. nano Volts for voltage, nano Amperes for current + u64 resolution; +}; + +static const struct channel_desc current_channel_desc[] =3D { + { + .reg =3D IIN_REG, + .label =3D "IIN_REG", + .resolution =3D 125000 + }, + { + .reg =3D ISYS_REG, + .avg_reg =3D AVGISYS_REG, + .label =3D "ISYS_REG", + .resolution =3D 312500 + } +}; + +static const struct channel_desc voltage_channel_desc[] =3D { + { + .reg =3D VBYP_REG, + .label =3D "VBYP_REG", + .resolution =3D 427246 + }, + { + .reg =3D VSYS_REG, + .label =3D "VSYS_REG", + .resolution =3D 156250 + } +}; + +static const struct regmap_range max77705_hwmon_readable_ranges[] =3D { + regmap_reg_range(AVGISYS_REG, AVGISYS_REG + 1), + regmap_reg_range(IIN_REG, IIN_REG + 1), + regmap_reg_range(ISYS_REG, ISYS_REG + 1), + regmap_reg_range(VBYP_REG, VBYP_REG + 1), + regmap_reg_range(VSYS_REG, VSYS_REG + 1), +}; + +static const struct regmap_access_table max77705_hwmon_readable_table =3D { + .yes_ranges =3D max77705_hwmon_readable_ranges, + .n_yes_ranges =3D ARRAY_SIZE(max77705_hwmon_readable_ranges), +}; + +static const struct regmap_config max77705_hwmon_regmap_config =3D { + .name =3D "max77705_hwmon", + .reg_bits =3D 8, + .val_bits =3D 16, + .rd_table =3D &max77705_hwmon_readable_table, + .max_register =3D MAX77705_FG_END, + .val_format_endian =3D REGMAP_ENDIAN_LITTLE +}; + +static int max77705_read_and_convert(struct regmap *regmap, u8 reg, u64 re= s, long *val) +{ + int ret; + u32 regval; + + ret =3D regmap_read(regmap, reg, ®val); + if (ret < 0) + return ret; + *val =3D mult_frac((long)regval, res, 1000000); + + return 0; +} + +static umode_t max77705_is_visible(const void *data, + enum hwmon_sensor_types type, + u32 attr, int channel) +{ + switch (type) { + case hwmon_in: + if (channel >=3D ARRAY_SIZE(voltage_channel_desc)) + return 0; + + switch (attr) { + case hwmon_in_input: + case hwmon_in_label: + return 0444; + default: + break; + } + break; + case hwmon_curr: + if (channel >=3D ARRAY_SIZE(current_channel_desc)) + return 0; + + switch (attr) { + case hwmon_curr_input: + case hwmon_in_label: + return 0444; + case hwmon_curr_average: + if (current_channel_desc[channel].avg_reg) + return 0444; + default: + break; + } + break; + default: + break; + } + return 0; +} + +static int max77705_read_string(struct device *dev, enum hwmon_sensor_type= s type, u32 attr, + int channel, const char **buf) +{ + switch (type) { + case hwmon_curr: + switch (attr) { + case hwmon_in_label: + *buf =3D current_channel_desc[channel].label; + return 0; + default: + return -EOPNOTSUPP; + } + + case hwmon_in: + switch (attr) { + case hwmon_in_label: + *buf =3D voltage_channel_desc[channel].label; + return 0; + default: + return -EOPNOTSUPP; + } + default: + return -EOPNOTSUPP; + } +} + +static int max77705_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct regmap *regmap =3D dev_get_drvdata(dev); + u8 reg; + u64 res; + + switch (type) { + case hwmon_curr: + switch (attr) { + case hwmon_curr_input: + reg =3D current_channel_desc[channel].reg; + res =3D current_channel_desc[channel].resolution; + + return max77705_read_and_convert(regmap, reg, res, val); + case hwmon_curr_average: + reg =3D current_channel_desc[channel].avg_reg; + res =3D current_channel_desc[channel].resolution; + + return max77705_read_and_convert(regmap, reg, res, val); + default: + return -EOPNOTSUPP; + } + + case hwmon_in: + switch (attr) { + case hwmon_in_input: + reg =3D voltage_channel_desc[channel].reg; + res =3D voltage_channel_desc[channel].resolution; + + return max77705_read_and_convert(regmap, reg, res, val); + default: + return -EOPNOTSUPP; + } + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static const struct hwmon_ops max77705_hwmon_ops =3D { + .is_visible =3D max77705_is_visible, + .read =3D max77705_read, + .read_string =3D max77705_read_string, +}; + +static const struct hwmon_channel_info *max77705_info[] =3D { + HWMON_CHANNEL_INFO(in, + HWMON_I_INPUT | HWMON_I_LABEL, + HWMON_I_INPUT | HWMON_I_LABEL + ), + HWMON_CHANNEL_INFO(curr, + HWMON_C_INPUT | HWMON_C_LABEL, + HWMON_C_INPUT | HWMON_C_AVERAGE | HWMON_C_LABEL + ), + NULL +}; + +static const struct hwmon_chip_info max77705_chip_info =3D { + .ops =3D &max77705_hwmon_ops, + .info =3D max77705_info, +}; + +static int max77705_hwmon_probe(struct platform_device *pdev) +{ + struct i2c_client *i2c; + struct device *hwmon_dev; + struct regmap *regmap; + + i2c =3D to_i2c_client(pdev->dev.parent); + regmap =3D devm_regmap_init_i2c(i2c, &max77705_hwmon_regmap_config); + if (IS_ERR(regmap)) + return dev_err_probe(&pdev->dev, PTR_ERR(regmap), + "Failed to register max77705 hwmon regmap\n"); + + hwmon_dev =3D devm_hwmon_device_register_with_info(&pdev->dev, "max77705"= , regmap, + &max77705_chip_info, NULL); + if (IS_ERR(hwmon_dev)) + return dev_err_probe(&pdev->dev, PTR_ERR(hwmon_dev), + "Unable to register hwmon device\n"); + + return 0; +}; + +static struct platform_driver max77705_hwmon_driver =3D { + .driver =3D { + .name =3D "max77705-hwmon", + }, + .probe =3D max77705_hwmon_probe, +}; + +module_platform_driver(max77705_hwmon_driver); + +MODULE_AUTHOR("Dzmitry Sankouski "); +MODULE_DESCRIPTION("MAX77705 monitor driver"); +MODULE_LICENSE("GPL"); + --- base-commit: 20d5c66e1810e6e8805ec0d01373afb2dba9f51a change-id: 20250123-initial-support-for-max77705-sensors-ad0170ac1ec5 Best regards, --=20 Dzmitry Sankouski