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[89.139.15.25]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e538b6e9bsm209228145e9.10.2026.05.07.05.47.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 May 2026 05:47:44 -0700 (PDT) From: Vladislav Kulikov To: jic23@kernel.org, dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Vladislav Kulikov Subject: [PATCH 1/3] dt-bindings: iio: magnetometer: add MEMSIC MMC5983MA Date: Thu, 7 May 2026 12:47:22 +0000 Message-ID: <20260507124724.813043-2-vlad.kulikov.c@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260507124724.813043-1-vlad.kulikov.c@gmail.com> References: <20260507124724.813043-1-vlad.kulikov.c@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add device tree binding documentation for the MEMSIC MMC5983MA 3-axis magnetometer connected via I2C. Signed-off-by: Vladislav Kulikov --- .../iio/magnetometer/memsic,mmc5983.yaml | 38 +++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/magnetometer/mems= ic,mmc5983.yaml diff --git a/Documentation/devicetree/bindings/iio/magnetometer/memsic,mmc5= 983.yaml b/Documentation/devicetree/bindings/iio/magnetometer/memsic,mmc598= 3.yaml new file mode 100644 index 000000000000..bbe2aa597f75 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/magnetometer/memsic,mmc5983.yaml @@ -0,0 +1,38 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/magnetometer/memsic,mmc5983.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: MEMSIC MMC5983MA 3-axis magnetic sensor + +maintainers: + - Vladislav Kulikov + +properties: + compatible: + const: memsic,mmc5983 + + reg: + maxItems: 1 + + vdd-supply: + description: Regulator that provides power to the sensor + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + i2c { + #address-cells =3D <1>; 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[89.139.15.25]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e538b6e9bsm209228145e9.10.2026.05.07.05.47.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 May 2026 05:47:53 -0700 (PDT) From: Vladislav Kulikov To: jic23@kernel.org, dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Vladislav Kulikov Subject: [PATCH 2/3] iio: magnetometer: add driver for MEMSIC MMC5983MA Date: Thu, 7 May 2026 12:47:23 +0000 Message-ID: <20260507124724.813043-3-vlad.kulikov.c@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260507124724.813043-1-vlad.kulikov.c@gmail.com> References: <20260507124724.813043-1-vlad.kulikov.c@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add support for the MEMSIC MMC5983MA 3-axis magnetometer. The driver provides raw magnetic field readings via IIO sysfs with SET/RESET offset cancellation for each measurement. Signed-off-by: Vladislav Kulikov --- drivers/iio/magnetometer/Kconfig | 11 + drivers/iio/magnetometer/Makefile | 1 + drivers/iio/magnetometer/mmc5983.c | 330 +++++++++++++++++++++++++++++ 3 files changed, 342 insertions(+) create mode 100644 drivers/iio/magnetometer/mmc5983.c diff --git a/drivers/iio/magnetometer/Kconfig b/drivers/iio/magnetometer/Kc= onfig index fb313e591e85..ea2697fb5ab6 100644 --- a/drivers/iio/magnetometer/Kconfig +++ b/drivers/iio/magnetometer/Kconfig @@ -151,6 +151,17 @@ config MMC5633 To compile this driver as a module, choose M here: the module will be called mmc5633 =20 +config MMC5983 + tristate "MEMSIC MMC5983 3-axis magnetic sensor" + depends on I2C + select REGMAP_I2C + help + Say yes here to build support for the MEMSIC MMC5983 3-axis + magnetic sensor. + + To compile this driver as a module, choose M here: the module + will be called mmc5983 + config IIO_ST_MAGN_3AXIS tristate "STMicroelectronics magnetometers 3-Axis Driver" depends on (I2C || SPI_MASTER) && SYSFS diff --git a/drivers/iio/magnetometer/Makefile b/drivers/iio/magnetometer/M= akefile index 5bd227f8c120..7fd9b3fd914e 100644 --- a/drivers/iio/magnetometer/Makefile +++ b/drivers/iio/magnetometer/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_MAG3110) +=3D mag3110.o obj-$(CONFIG_HID_SENSOR_MAGNETOMETER_3D) +=3D hid-sensor-magn-3d.o obj-$(CONFIG_MMC35240) +=3D mmc35240.o obj-$(CONFIG_MMC5633) +=3D mmc5633.o +obj-$(CONFIG_MMC5983) +=3D mmc5983.o =20 obj-$(CONFIG_IIO_ST_MAGN_3AXIS) +=3D st_magn.o st_magn-y :=3D st_magn_core.o diff --git a/drivers/iio/magnetometer/mmc5983.c b/drivers/iio/magnetometer/= mmc5983.c new file mode 100644 index 000000000000..7f2f5133a472 --- /dev/null +++ b/drivers/iio/magnetometer/mmc5983.c @@ -0,0 +1,330 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * MMC5983 - MEMSIC 3-axis Magnetic Sensor + * + * Copyright (c) 2026, Vlad Kulikov + * + * IIO driver for MMC5983 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MMC5983_REG_XOUT0 0x00 +#define MMC5983_REG_XOUT1 0x01 +#define MMC5983_REG_YOUT0 0x02 +#define MMC5983_REG_YOUT1 0x03 +#define MMC5983_REG_ZOUT0 0x04 +#define MMC5983_REG_ZOUT1 0x05 +#define MMC5983_REG_XYZOUT2 0x06 + +#define MMC5983_REG_STATUS 0x08 + +#define MMC5983_REG_CTRL0 0x09 +#define MMC5983_REG_CTRL1 0x0A +#define MMC5983_REG_CTRL2 0x0B +#define MMC5983_REG_CTRL3 0x0C + +#define MMC5983_REG_ID 0x2F + +#define MMC5983_PRODUCT_ID 0x30 + +#define MMC5983_STATUS_MEAS_M_DONE_BIT BIT(0) +#define MMC5983_STATUS_OTP_RD_DONE_BIT BIT(4) + +#define MMC5983_CTRL0_TM_M_BIT BIT(0) +#define MMC5983_CTRL0_SET_BIT BIT(3) +#define MMC5983_CTRL0_RESET_BIT BIT(4) +#define MMC5983_CTRL0_OTP_RD_BIT BIT(6) + +#define MMC5983_CTRL1_SW_RST_BIT BIT(7) + +enum mmc5983_axis { + MMC5983_AXIS_X, + MMC5983_AXIS_Y, + MMC5983_AXIS_Z +}; + +struct mmc5983_data { + struct regmap *regmap; + /* Protects chip access during SET/RESET measurement sequence */ + struct mutex mutex; +}; + +#define MMC5983_CHANNEL(_axis) { \ + .type =3D IIO_MAGN, \ + .modified =3D 1, \ + .channel2 =3D IIO_MOD_##_axis, \ + .address =3D MMC5983_AXIS_##_axis, \ + .info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type =3D BIT(IIO_CHAN_INFO_SCALE), \ +} + +static const struct iio_chan_spec mmc5983_channels[] =3D { + MMC5983_CHANNEL(X), + MMC5983_CHANNEL(Y), + MMC5983_CHANNEL(Z) +}; + +static int mmc5983_take_measurement(struct mmc5983_data *data, int m[3]) +{ + unsigned int status; + u8 buf[7]; + int ret; + + ret =3D regmap_write(data->regmap, MMC5983_REG_CTRL0, + MMC5983_CTRL0_TM_M_BIT); + if (ret) + return ret; + + ret =3D regmap_read_poll_timeout(data->regmap, MMC5983_REG_STATUS, + status, + status & MMC5983_STATUS_MEAS_M_DONE_BIT, + 5000, 50000); + if (ret) + return ret; + + ret =3D regmap_bulk_read(data->regmap, MMC5983_REG_XOUT0, buf, + sizeof(buf)); + if (ret) + return ret; + + m[0] =3D (buf[0] << 10) | (buf[1] << 2) | ((buf[6] >> 6) & 0x3); + m[1] =3D (buf[2] << 10) | (buf[3] << 2) | ((buf[6] >> 4) & 0x3); + m[2] =3D (buf[4] << 10) | (buf[5] << 2) | ((buf[6] >> 2) & 0x3); + + return 0; +} + +static int mmc5983_read_raw(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, int *val, + int *val2, long mask) +{ + struct mmc5983_data *data =3D iio_priv(indio_dev); + int m1[3], m2[3]; + int ret =3D -EBUSY; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + scoped_guard(mutex, &data->mutex) { + ret =3D regmap_write(data->regmap, MMC5983_REG_CTRL0, + MMC5983_CTRL0_SET_BIT); + if (ret) + break; + + fsleep(500); + + ret =3D mmc5983_take_measurement(data, m1); + if (ret) + break; + + ret =3D regmap_write(data->regmap, MMC5983_REG_CTRL0, + MMC5983_CTRL0_RESET_BIT); + if (ret) + break; + + fsleep(500); + + ret =3D mmc5983_take_measurement(data, m2); + if (ret) + break; + + *val =3D (m1[chan->address] - m2[chan->address]) / 2; + ret =3D IIO_VAL_INT; + } + return ret; + case IIO_CHAN_INFO_SCALE: + *val =3D 0; + *val2 =3D 61035; + return IIO_VAL_INT_PLUS_NANO; + default: + return -EINVAL; + } +} + +static const struct iio_info mmc5983_info =3D { + .read_raw =3D mmc5983_read_raw +}; + +static bool mmc5983_is_writeable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case MMC5983_REG_CTRL0: + case MMC5983_REG_CTRL1: + case MMC5983_REG_CTRL2: + case MMC5983_REG_CTRL3: + return true; + default: + return false; + } +} + +static bool mmc5983_is_readable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case MMC5983_REG_XOUT0: + case MMC5983_REG_XOUT1: + case MMC5983_REG_YOUT0: + case MMC5983_REG_YOUT1: + case MMC5983_REG_ZOUT0: + case MMC5983_REG_ZOUT1: + case MMC5983_REG_XYZOUT2: + case MMC5983_REG_STATUS: + case MMC5983_REG_CTRL0: + case MMC5983_REG_CTRL1: + case MMC5983_REG_CTRL2: + case MMC5983_REG_CTRL3: + case MMC5983_REG_ID: + return true; + default: + return false; + } +} + +static bool mmc5983_is_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case MMC5983_REG_XOUT0: + case MMC5983_REG_XOUT1: + case MMC5983_REG_YOUT0: + case MMC5983_REG_YOUT1: + case MMC5983_REG_ZOUT0: + case MMC5983_REG_ZOUT1: + case MMC5983_REG_XYZOUT2: + case MMC5983_REG_STATUS: + case MMC5983_REG_CTRL0: + case MMC5983_REG_CTRL1: + return true; + default: + return false; + } +} + +static const struct regmap_config mmc5983_regmap_config =3D { + .name =3D "mmc5983_regmap", + .reg_bits =3D 8, + .val_bits =3D 8, + .max_register =3D MMC5983_REG_ID, + .writeable_reg =3D mmc5983_is_writeable_reg, + .readable_reg =3D mmc5983_is_readable_reg, + .volatile_reg =3D mmc5983_is_volatile_reg, +}; + +static int mmc5983_init(struct mmc5983_data *data) +{ + unsigned int reg_id, status; + int ret; + + ret =3D regmap_read(data->regmap, MMC5983_REG_ID, ®_id); + if (ret) + return dev_err_probe(regmap_get_device(data->regmap), ret, + "Error reading product id\n"); + + if (reg_id !=3D MMC5983_PRODUCT_ID) + return dev_err_probe(regmap_get_device(data->regmap), -ENODEV, + "wrong product id 0x%02x\n", reg_id); + + ret =3D regmap_write(data->regmap, MMC5983_REG_CTRL1, + MMC5983_CTRL1_SW_RST_BIT); + if (ret) + return ret; + + fsleep(10000); + + ret =3D regmap_write(data->regmap, MMC5983_REG_CTRL0, + MMC5983_CTRL0_OTP_RD_BIT); + if (ret) + return ret; + + ret =3D regmap_read_poll_timeout(data->regmap, MMC5983_REG_STATUS, + status, + status & MMC5983_STATUS_OTP_RD_DONE_BIT, + 1000, 10000); + if (ret) + return ret; + + ret =3D regmap_write(data->regmap, MMC5983_REG_CTRL0, + MMC5983_CTRL0_SET_BIT); + if (ret) + return ret; + + fsleep(500); + + ret =3D regmap_write(data->regmap, MMC5983_REG_CTRL0, + MMC5983_CTRL0_RESET_BIT); + if (ret) + return ret; + + fsleep(500); + + return 0; +} + +static int mmc5983_probe(struct i2c_client *i2c) +{ + struct device *dev =3D &i2c->dev; + struct mmc5983_data *data; + struct iio_dev *indio_dev; + int ret; + + indio_dev =3D devm_iio_device_alloc(dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + data =3D iio_priv(indio_dev); + + ret =3D devm_mutex_init(dev, &data->mutex); + if (ret) + return ret; + + data->regmap =3D devm_regmap_init_i2c(i2c, &mmc5983_regmap_config); + if (IS_ERR(data->regmap)) + return dev_err_probe(dev, PTR_ERR(data->regmap), + "failed to allocate register map\n"); + + indio_dev->info =3D &mmc5983_info; + indio_dev->modes =3D INDIO_DIRECT_MODE; + indio_dev->name =3D i2c->name; + indio_dev->channels =3D mmc5983_channels; 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[89.139.15.25]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e538b6e9bsm209228145e9.10.2026.05.07.05.47.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 May 2026 05:47:58 -0700 (PDT) From: Vladislav Kulikov To: jic23@kernel.org, dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Vladislav Kulikov Subject: [PATCH 3/3] MAINTAINERS: add entry for MEMSIC MMC5983MA magnetometer driver Date: Thu, 7 May 2026 12:47:24 +0000 Message-ID: <20260507124724.813043-4-vlad.kulikov.c@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260507124724.813043-1-vlad.kulikov.c@gmail.com> References: <20260507124724.813043-1-vlad.kulikov.c@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Signed-off-by: Vladislav Kulikov --- MAINTAINERS | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 882214b0e7db..b1d9d7b586a1 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -17170,6 +17170,13 @@ F: drivers/mtd/ F: include/linux/mtd/ F: include/uapi/mtd/ =20 +MEMSIC MMC5983 MAGNETOMETER DRIVER +M: Vladislav Kulikov +L: linux-iio@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/iio/magnetometer/memsic,mmc5983.yaml +F: drivers/iio/magnetometer/mmc5983.c + MEN A21 WATCHDOG DRIVER M: Johannes Thumshirn L: linux-watchdog@vger.kernel.org --=20 2.43.0