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[35.229.176.104]) by smtp.gmail.com with ESMTPSA id l84-v6sm42534980pfg.3.2018.09.20.06.13.49 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 20 Sep 2018 06:13:49 -0700 (PDT) From: Song Qiang To: jic23@kernel.org, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, robh+dt@kernel.org, mark.rutland@arm.com Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Song Qiang Subject: [PATCH] iio: magnetometer: Add support for PNI RM3100 9-axis magnetometer Date: Thu, 20 Sep 2018 21:13:40 +0800 Message-Id: <20180920131340.6699-1-songqiang1304521@gmail.com> X-Mailer: git-send-email 2.17.1 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP PNI RM3100 magnetometer is a high resolution, large signal immunity magnetometer, composed of 3 single sensors and a processing chip. PNI is currently not in the vendors list, so this is also adding it. Following functions are available: - Single-shot measurement from /sys/bus/iio/devices/iio:deviceX/in_magn_{axis}_raw - Triggerd buffer measurement. - Both i2c and spi interface are supported. - Both interrupt and polling measurement is supported, depands on if the 'interrupts' in DT is declared. Signed-off-by: Song Qiang --- .../bindings/iio/magnetometer/pni,rm3100.txt | 57 +++ .../devicetree/bindings/vendor-prefixes.txt | 1 + MAINTAINERS | 10 + drivers/iio/magnetometer/Kconfig | 29 ++ drivers/iio/magnetometer/Makefile | 4 + drivers/iio/magnetometer/rm3100-core.c | 399 ++++++++++++++++++ drivers/iio/magnetometer/rm3100-i2c.c | 66 +++ drivers/iio/magnetometer/rm3100-spi.c | 72 ++++ drivers/iio/magnetometer/rm3100.h | 90 ++++ 9 files changed, 728 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/magnetometer/pni,rm3100.txt create mode 100644 drivers/iio/magnetometer/rm3100-core.c create mode 100644 drivers/iio/magnetometer/rm3100-i2c.c create mode 100644 drivers/iio/magnetometer/rm3100-spi.c create mode 100644 drivers/iio/magnetometer/rm3100.h diff --git a/Documentation/devicetree/bindings/iio/magnetometer/pni,rm3100.txt b/Documentation/devicetree/bindings/iio/magnetometer/pni,rm3100.txt new file mode 100644 index 000000000000..d0d2063e943f --- /dev/null +++ b/Documentation/devicetree/bindings/iio/magnetometer/pni,rm3100.txt @@ -0,0 +1,57 @@ +* PNI RM3100 9-axis magnetometer sensor + +I2C Bus: + +Required properties: + +- compatible : should be "pni,rm3100-i2c" +- reg : the I2C address of the magnetometer + +Optional properties: + +- interrupts: data ready (DRDY) from the chip. + The interrupts can be triggered on rising edges. + + Refer to interrupt-controller/interrupts.txt for generic + interrupt client node bindings. + +- pinctrl-*: pinctrl setup for DRDY line. + +Example: + +rm3100: rm3100@20 { + pinctrl-names = "default"; + pinctrl-0 = <&rm3100_pins>; + + compatible = "pni,rm3100-i2c"; + reg = <0x20>; + interrupt-parent = <&gpio0>; + interrupts = <4 IRQ_TYPE_EDGE_RISING>; +}; + +SPI Bus: + +Required properties: + +- compatible : should be "pni,rm3100-spi" +- reg : address of sensor, usually 0 or 1. + +Optional properties: + +- interrupts: data ready (DRDY) from the chip. + The interrupts can be triggered on rising edges. + + Refer to interrupt-controller/interrupts.txt for generic + interrupt client node bindings. + +- pinctrl-*: pinctrl setup for DRDY line, depands on archtechture. + +Example: + +rm3100: rm3100@0{ + compatible = "pni,rm3100-spi"; + reg = <0>; + + interrupt-parent = <&gpio0>; + interrupts = <4 IRQ_TYPE_EDGE_RISING>; +}; diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt index 41f0b97eb933..5bf3395fe9ae 100644 --- a/Documentation/devicetree/bindings/vendor-prefixes.txt +++ b/Documentation/devicetree/bindings/vendor-prefixes.txt @@ -288,6 +288,7 @@ pine64 Pine64 pixcir PIXCIR MICROELECTRONICS Co., Ltd plathome Plat'Home Co., Ltd. plda PLDA +pni PNI portwell Portwell Inc. poslab Poslab Technology Co., Ltd. powervr PowerVR (deprecated, use img) diff --git a/MAINTAINERS b/MAINTAINERS index 967ce8cdd1cc..30ee8cf98312 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11393,6 +11393,16 @@ M: "Rafael J. Wysocki" S: Maintained F: drivers/pnp/ +PNI RM3100 IIO DRIVER +M: Song Qiang +L: linux-iio@vger.kernel.org +S: Maintained +F: drivers/iio/magnetometer/rm3100-core.c +F: drivers/iio/magnetometer/rm3100-i2c.c +F: drivers/iio/magnetometer/rm3100-spi.c +F: drivers/iio/magnetometer/rm3100.h +F: Documentation/devicetree/bindings/iio/magnetometer/rm3100.txt + POSIX CLOCKS and TIMERS M: Thomas Gleixner L: linux-kernel@vger.kernel.org diff --git a/drivers/iio/magnetometer/Kconfig b/drivers/iio/magnetometer/Kconfig index ed9d776d01af..f130b866a4fc 100644 --- a/drivers/iio/magnetometer/Kconfig +++ b/drivers/iio/magnetometer/Kconfig @@ -175,4 +175,33 @@ config SENSORS_HMC5843_SPI - hmc5843_core (core functions) - hmc5843_spi (support for HMC5983) +config SENSORS_RM3100 + tristate + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER + +config SENSORS_RM3100_I2C + tristate "PNI RM3100 9-Axis Magnetometer (I2C)" + depends on I2C + select SENSORS_RM3100 + select REGMAP_I2C + help + Say Y here to add support for the PNI RM3100 9-Axis Magnetometer. + + This driver can also be compiled as a module. + To compile this driver as a module, choose M here: the module + will be called rm3100-i2c. + +config SENSORS_RM3100_SPI + tristate "PNI RM3100 9-Axis Magnetometer (SPI)" + depends on SPI_MASTER + select SENSORS_RM3100 + select REGMAP_SPI + help + Say Y here to add support for the PNI RM3100 9-Axis Magnetometer. + + This driver can also be compiled as a module. + To compile this driver as a module, choose M here: the module + will be called rm3100-spi. + endmenu diff --git a/drivers/iio/magnetometer/Makefile b/drivers/iio/magnetometer/Makefile index 664b2f866472..ba1bc34b82fa 100644 --- a/drivers/iio/magnetometer/Makefile +++ b/drivers/iio/magnetometer/Makefile @@ -24,3 +24,7 @@ obj-$(CONFIG_IIO_ST_MAGN_SPI_3AXIS) += st_magn_spi.o obj-$(CONFIG_SENSORS_HMC5843) += hmc5843_core.o obj-$(CONFIG_SENSORS_HMC5843_I2C) += hmc5843_i2c.o obj-$(CONFIG_SENSORS_HMC5843_SPI) += hmc5843_spi.o + +obj-$(CONFIG_SENSORS_RM3100) += rm3100-core.o +obj-$(CONFIG_SENSORS_RM3100_I2C) += rm3100-i2c.o +obj-$(CONFIG_SENSORS_RM3100_SPI) += rm3100-spi.o diff --git a/drivers/iio/magnetometer/rm3100-core.c b/drivers/iio/magnetometer/rm3100-core.c new file mode 100644 index 000000000000..55d515e0fe67 --- /dev/null +++ b/drivers/iio/magnetometer/rm3100-core.c @@ -0,0 +1,399 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * PNI RM3100 9-axis geomagnetic sensor driver core. + * + * Copyright (C) 2018 Song Qiang + * + * User Manual available at + * + * + * TODO: Scale channel, event generaton, pm. + */ + +#include +#include +#include + +#include +#include +#include +#include +#include + +#include "rm3100.h" + +static const struct regmap_range rm3100_readable_ranges[] = { + regmap_reg_range(RM_W_REG_START, RM_W_REG_END), +}; + +const struct regmap_access_table rm3100_readable_table = { + .yes_ranges = rm3100_readable_ranges, + .n_yes_ranges = ARRAY_SIZE(rm3100_readable_ranges), +}; + +static const struct regmap_range rm3100_writable_ranges[] = { + regmap_reg_range(RM_R_REG_START, RM_R_REG_END), +}; + +const struct regmap_access_table rm3100_writable_table = { + .yes_ranges = rm3100_writable_ranges, + .n_yes_ranges = ARRAY_SIZE(rm3100_writable_ranges), +}; + +static const struct regmap_range rm3100_volatile_ranges[] = { + regmap_reg_range(RM_V_REG_START, RM_V_REG_END), +}; + +const struct regmap_access_table rm3100_volatile_table = { + .yes_ranges = rm3100_volatile_ranges, + .n_yes_ranges = ARRAY_SIZE(rm3100_volatile_ranges), +}; + +static irqreturn_t rm3100_measurement_irq_handler(int irq, void *d) +{ + struct rm3100_data *data = d; + + complete(&data->measuring_done); + + return IRQ_HANDLED; +} + +static int rm3100_wait_measurement(struct rm3100_data *data) +{ + struct regmap *regmap = data->regmap; + unsigned int val; + u16 tries = 20; + int ret; + + /* A read cycle of 400kbits i2c bus is about 20us, plus the time + * used for schduling, a read cycle of fast mode of this device + * can reach 1.7ms, it may be possible for data arrives just + * after we check the RM_REG_STATUS. In this case, irq_handler is + * called before measuring_done is reinitialized, it will wait + * forever for a data that has already been ready. + * Reinitialize measuring_done before looking up makes sure we + * will always capture interrupt no matter when it happened. + */ + if (data->use_interrupt) + reinit_completion(&data->measuring_done); + + ret = regmap_read(regmap, RM_REG_STATUS, &val); + if (ret < 0) + return ret; + + if ((val & RM_STATUS_DRDY) != RM_STATUS_DRDY) { + if (data->use_interrupt) { + ret = wait_for_completion_timeout(&data->measuring_done, + msecs_to_jiffies(data->conversion_time)); + if (!ret) + return -ETIMEDOUT; + } else { + do { + ret = regmap_read(regmap, RM_REG_STATUS, &val); + if (ret < 0) + return ret; + + if (val & RM_STATUS_DRDY) + break; + + usleep_range(1000, 5000); + } while (--tries); + if (!tries) + return -ETIMEDOUT; + } + } + return 0; +} + +static int rm3100_read_mag(struct rm3100_data *data, int idx, int *val) +{ + struct regmap *regmap = data->regmap; + u8 buffer[3]; + int ret; + + mutex_lock(&data->lock); + ret = rm3100_wait_measurement(data); + if (ret < 0) { + mutex_unlock(&data->lock); + return ret; + } + + ret = regmap_bulk_read(regmap, RM_REG_MX2 + 3 * idx, buffer, 3); + mutex_unlock(&data->lock); + if (ret < 0) + return ret; + + *val = le32_to_cpu((buffer[0] << 16) + (buffer[1] << 8) + buffer[2]); + *val = sign_extend32(*val, 23); + + return IIO_VAL_INT; +} + +#define RM_CHANNEL(axis, idx) \ + { \ + .type = IIO_MAGN, \ + .modified = 1, \ + .channel2 = IIO_MOD_##axis, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ),\ + .scan_index = idx, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 24, \ + .storagebits = 32, \ + .shift = 8, \ + .endianness = IIO_LE, \ + }, \ + } + +static const struct iio_chan_spec rm3100_channels[] = { + RM_CHANNEL(X, 0), + RM_CHANNEL(Y, 1), + RM_CHANNEL(Z, 2), + IIO_CHAN_SOFT_TIMESTAMP(3), +}; + +static const unsigned long rm3100_scan_masks[] = {GENMASK(2, 0), 0}; + +#define RM_SAMP_NUM 14 + +/* Frequency : rm3100_samp_rates[][0].rm3100_samp_rates[][1]Hz. + * Time between reading: rm3100_sam_rates[][2]ms (The first on is actially 1.7). + */ +static const int rm3100_samp_rates[RM_SAMP_NUM][3] = { + {600, 0, 2}, {300, 0, 3}, {150, 0, 7}, {75, 0, 13}, {37, 0, 27}, + {18, 0, 55}, {9, 0, 110}, {4, 500000, 220}, {2, 300000, 440}, + {1, 200000, 800}, {0, 600000, 1600}, {0, 300000, 3300}, + {0, 15000, 6700}, {0, 75000, 13000} +}; + +static int rm3100_get_samp_freq(struct rm3100_data *data, int *val, int *val2) +{ + int ret; + int tmp; + + ret = regmap_read(data->regmap, RM_REG_TMRC, &tmp); + if (ret < 0) + return ret; + *val = rm3100_samp_rates[tmp-RM_TMRC_OFFSET][0]; + *val2 = rm3100_samp_rates[tmp-RM_TMRC_OFFSET][1]; + + return IIO_VAL_INT_PLUS_MICRO; +} + +static int rm3100_set_samp_freq(struct rm3100_data *data, int val, int val2) +{ + struct regmap *regmap = data->regmap; + int cycle_count; + int ret; + int i; + + /* All cycle count registers use the same value. */ + ret = regmap_read(regmap, RM_REG_CCXL, &cycle_count); + if (cycle_count < 0) + return cycle_count; + + for (i = 0; i < RM_SAMP_NUM; i++) { + if (val == rm3100_samp_rates[i][0] && + val2 == rm3100_samp_rates[i][1]) + break; + } + + if (i != RM_SAMP_NUM) { + mutex_lock(&data->lock); + ret = regmap_write(regmap, RM_REG_TMRC, i + RM_TMRC_OFFSET); + if (ret < 0) + return ret; + + /* Checking if cycle count registers need changing. */ + if (val == 600 && cycle_count == 200) { + for (i = 0; i < 3; i++) { + regmap_write(regmap, RM_REG_CCXL + 2 * i, 100); + if (ret < 0) + return ret; + } + } else if (val != 600 && cycle_count == 100) { + for (i = 0; i < 3; i++) { + regmap_write(regmap, RM_REG_CCXL + 2 * i, 200); + if (ret < 0) + return ret; + } + } + /* Writing TMRC registers requires CMM reset. */ + ret = regmap_write(regmap, RM_REG_CMM, 0); + if (ret < 0) + return ret; + ret = regmap_write(regmap, RM_REG_CMM, RM_CMM_PMX | + RM_CMM_PMY | RM_CMM_PMZ | RM_CMM_START); + if (ret < 0) + return ret; + mutex_unlock(&data->lock); + + data->conversion_time = rm3100_samp_rates[i][2] + 3000; + return 0; + } + return -EINVAL; +} + +static int rm3100_read_raw(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + int *val, int *val2, long mask) +{ + struct rm3100_data *data = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = iio_device_claim_direct_mode(indio_dev); + if (ret < 0) + return ret; + ret = rm3100_read_mag(data, chan->scan_index, val); + iio_device_release_direct_mode(indio_dev); + + return ret; + case IIO_CHAN_INFO_SAMP_FREQ: + return ret = rm3100_get_samp_freq(data, val, val2); + default: + return -EINVAL; + } +} + +static int rm3100_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct rm3100_data *data = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + ret = rm3100_set_samp_freq(data, val, val2); + if (ret < 0) + return ret; + return 0; + default: + return -EINVAL; + } + +} + +static const struct iio_info rm3100_info = { + .read_raw = rm3100_read_raw, + .write_raw = rm3100_write_raw, +}; + +static irqreturn_t rm3100_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct rm3100_data *data = iio_priv(indio_dev); + struct regmap *regmap = data->regmap; + u8 *buffer; + int ret; + int i; + + buffer = devm_kzalloc(data->dev, indio_dev->scan_bytes, GFP_KERNEL); + if (!buffer) + goto done; + + mutex_lock(&data->lock); + ret = rm3100_wait_measurement(data); + if (ret < 0) { + mutex_unlock(&data->lock); + goto done; + } + + for (i = 0; i < 3; i++) { + ret = regmap_bulk_read(regmap, RM_REG_MX2 + 3 * i, + buffer + 4 * i, 3); + if (ret < 0) + return ret; + } + mutex_unlock(&data->lock); + + iio_push_to_buffers_with_timestamp(indio_dev, buffer, + iio_get_time_ns(indio_dev)); +done: + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + +int rm3100_common_probe(struct device *dev, struct regmap *regmap, int irq) +{ + struct iio_dev *indio_dev; + struct rm3100_data *data; + int tmp; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + data = iio_priv(indio_dev); + dev_set_drvdata(dev, indio_dev); + data->dev = dev; + data->regmap = regmap; + + mutex_init(&data->lock); + + indio_dev->dev.parent = dev; + indio_dev->name = "rm3100"; + indio_dev->info = &rm3100_info; + indio_dev->channels = rm3100_channels; + indio_dev->num_channels = ARRAY_SIZE(rm3100_channels); + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->available_scan_masks = rm3100_scan_masks; + + if (!irq) + data->use_interrupt = false; + else { + data->use_interrupt = true; + ret = devm_request_irq(dev, + irq, + rm3100_measurement_irq_handler, + IRQF_TRIGGER_RISING, + indio_dev->name, + data); + if (ret < 0) { + dev_err(dev, + "request irq line failed."); + return -ret; + } + init_completion(&data->measuring_done); + } + + ret = iio_triggered_buffer_setup(indio_dev, NULL, + rm3100_trigger_handler, NULL); + if (ret < 0) + return ret; + + /* 3sec more wait time. */ + ret = regmap_read(data->regmap, RM_REG_TMRC, &tmp); + data->conversion_time = rm3100_samp_rates[tmp-RM_TMRC_OFFSET][2] + 3000; + + /* Starting all channels' conversion. */ + ret = regmap_write(regmap, RM_REG_CMM, + RM_CMM_PMX | RM_CMM_PMY | RM_CMM_PMZ | RM_CMM_START); + if (ret < 0) + return ret; + + return devm_iio_device_register(dev, indio_dev); +} +EXPORT_SYMBOL(rm3100_common_probe); + +int rm3100_common_remove(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct rm3100_data *data = iio_priv(indio_dev); + struct regmap *regmap = data->regmap; + + regmap_write(regmap, RM_REG_CMM, 0x00); + + return 0; +} +EXPORT_SYMBOL(rm3100_common_remove); + +MODULE_AUTHOR("Song Qiang "); +MODULE_DESCRIPTION("PNI RM3100 9-axis magnetometer i2c driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/magnetometer/rm3100-i2c.c b/drivers/iio/magnetometer/rm3100-i2c.c new file mode 100644 index 000000000000..b50dc5b1b30b --- /dev/null +++ b/drivers/iio/magnetometer/rm3100-i2c.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Support for PNI RM3100 9-axis geomagnetic sensor a i2c bus. + * + * Copyright (C) 2018 Song Qiang + * + * User Manual available at + * + * + * i2c slave address 0x20 + SA1 << 1 + SA0. + */ + +#include + +#include "rm3100.h" + +static const struct regmap_config rm3100_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + + .rd_table = &rm3100_readable_table, + .wr_table = &rm3100_writable_table, + .volatile_table = &rm3100_volatile_table, + + .cache_type = REGCACHE_RBTREE, +}; + +static int rm3100_probe(struct i2c_client *client) +{ + struct regmap *regmap; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_READ_I2C_BLOCK | I2C_FUNC_SMBUS_BYTE_DATA)) + return -EOPNOTSUPP; + + regmap = devm_regmap_init_i2c(client, &rm3100_regmap_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + return rm3100_common_probe(&client->dev, regmap, client->irq); +} + +static int rm3100_remove(struct i2c_client *client) +{ + return rm3100_common_remove(&client->dev); +} + +static const struct of_device_id rm3100_dt_match[] = { + { .compatible = "pni,rm3100-i2c", }, + { } +}; +MODULE_DEVICE_TABLE(of, rm3100_dt_match); + +static struct i2c_driver rm3100_driver = { + .driver = { + .name = "rm3100-i2c", + .of_match_table = rm3100_dt_match, + }, + .probe_new = rm3100_probe, + .remove = rm3100_remove, +}; +module_i2c_driver(rm3100_driver); + +MODULE_AUTHOR("Song Qiang "); +MODULE_DESCRIPTION("PNI RM3100 9-axis magnetometer i2c driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/magnetometer/rm3100-spi.c b/drivers/iio/magnetometer/rm3100-spi.c new file mode 100644 index 000000000000..2c7dd9e3a1a2 --- /dev/null +++ b/drivers/iio/magnetometer/rm3100-spi.c @@ -0,0 +1,72 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Support for PNI RM3100 9-axis geomagnetic sensor a spi bus. + * + * Copyright (C) 2018 Song Qiang + * + * User Manual available at + * + */ + +#include + +#include "rm3100.h" + +static const struct regmap_config rm3100_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + + .rd_table = &rm3100_readable_table, + .wr_table = &rm3100_writable_table, + .volatile_table = &rm3100_volatile_table, + + .read_flag_mask = 0x80, + + .cache_type = REGCACHE_RBTREE, +}; + +static int rm3100_probe(struct spi_device *spi) +{ + struct regmap *regmap; + int ret; + + /* Actually this device supports both mode 0 and mode 3. */ + spi->mode = SPI_MODE_0; + /* data rates cannot exceeds 1Mbits. */ + spi->max_speed_hz = 1000000; + spi->bits_per_word = 8; + ret = spi_setup(spi); + if (ret) + return ret; + + regmap = devm_regmap_init_spi(spi, &rm3100_regmap_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + return rm3100_common_probe(&spi->dev, regmap, spi->irq); +} + +static int rm3100_remove(struct spi_device *spi) +{ + return rm3100_common_remove(&spi->dev); +} + +static const struct of_device_id rm3100_dt_match[] = { + { .compatible = "pni,rm3100-spi", }, + { } +}; +MODULE_DEVICE_TABLE(of, rm3100_dt_match); + +static struct spi_driver rm3100_driver = { + .driver = { + .name = "rm3100-spi", + .of_match_table = rm3100_dt_match, + }, + .probe = rm3100_probe, + .remove = rm3100_remove, +}; +module_spi_driver(rm3100_driver); + +MODULE_AUTHOR("Song Qiang "); +MODULE_DESCRIPTION("PNI RM3100 9-axis magnetometer spi driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/magnetometer/rm3100.h b/drivers/iio/magnetometer/rm3100.h new file mode 100644 index 000000000000..5e30bc0f5149 --- /dev/null +++ b/drivers/iio/magnetometer/rm3100.h @@ -0,0 +1,90 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Header file for PNI RM3100 driver + * + * Copyright (C) 2018 Song Qiang + */ + +#ifndef RM3100_CORE_H +#define RM3100_CORE_H + +#include +#include + +#define RM_REG_REV_ID 0x36 + +/* Cycle Count Registers MSBs and LSBs. */ +#define RM_REG_CCXM 0x04 +#define RM_REG_CCXL 0x05 +#define RM_REG_CCYM 0x06 +#define RM_REG_CCYL 0x07 +#define RM_REG_CCZM 0x08 +#define RM_REG_CCZL 0x09 + +/* Single Measurement Mode register. */ +#define RM_REG_POLL 0x00 +#define RM_POLL_PMX BIT(4) +#define RM_POLL_PMY BIT(5) +#define RM_POLL_PMZ BIT(6) + +/* Continues Measurement Mode register. */ +#define RM_REG_CMM 0x01 +#define RM_CMM_START BIT(0) +#define RM_CMM_DRDM BIT(2) +#define RM_CMM_PMX BIT(4) +#define RM_CMM_PMY BIT(5) +#define RM_CMM_PMZ BIT(6) + +/* TiMe Rate Configuration register. */ +#define RM_REG_TMRC 0x0B +#define RM_TMRC_OFFSET 0x92 + +/* Result Status register. */ +#define RM_REG_STATUS 0x34 +#define RM_STATUS_DRDY BIT(7) + +/* Measurement result registers. */ +#define RM_REG_MX2 0x24 +#define RM_REG_MX1 0x25 +#define RM_REG_MX0 0x26 +#define RM_REG_MY2 0x27 +#define RM_REG_MY1 0x28 +#define RM_REG_MY0 0x29 +#define RM_REG_MZ2 0x2a +#define RM_REG_MZ1 0x2b +#define RM_REG_MZ0 0x2c + +#define RM_REG_HSHAKE 0x35 + +#define RM_W_REG_START RM_REG_POLL +#define RM_W_REG_END RM_REG_REV_ID +#define RM_R_REG_START RM_REG_POLL +#define RM_R_REG_END RM_REG_HSHAKE +#define RM_V_REG_START RM_REG_MX2 +#define RM_V_REG_END RM_REG_HSHAKE + +/* Built-In Self Test reigister. */ +#define RM_REG_BIST 0x33 + +struct rm3100_data { + struct device *dev; + struct regmap *regmap; + struct completion measuring_done; + bool use_interrupt; + + int conversion_time; + + /* To protect consistency of every measurement and sampling + * frequency change operations. + */ + struct mutex lock; +}; + +extern const struct regmap_access_table rm3100_readable_table; +extern const struct regmap_access_table rm3100_writable_table; +extern const struct regmap_access_table rm3100_volatile_table; + +int rm3100_common_probe(struct device *dev, struct regmap *regmap, int irq); +int rm3100_common_remove(struct device *dev); + +#endif /* RM3100_CORE_H */