iio: magnetometer: Add driver support for PNI RM3100
PNI RM3100 is a high resolution, large signal immunity magnetometer,
composed of 3 single sensors and a processing chip with a MagI2C
interface.
Following functions are available:
- Single-shot measurement from
/sys/bus/iio/devices/iio:deviceX/in_magn_{axis}_raw
- Triggerd buffer measurement.
- DRDY pin for data ready trigger.
- Both i2c and spi interface are supported.
- Both interrupt and polling measurement is supported, depends on if
the 'interrupts' in DT is declared.
Signed-off-by: Song Qiang <songqiang1304521@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Song Qiang
Jonathan Cameron
parent
9a8d64fa97
commit
121354b2ec
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@ -11607,6 +11607,13 @@ M: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
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S: Maintained
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F: drivers/pnp/
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PNI RM3100 IIO DRIVER
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M: Song Qiang <songqiang1304521@gmail.com>
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L: linux-iio@vger.kernel.org
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S: Maintained
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F: drivers/iio/magnetometer/rm3100*
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F: Documentation/devicetree/bindings/iio/magnetometer/pni,rm3100.txt
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POSIX CLOCKS and TIMERS
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M: Thomas Gleixner <tglx@linutronix.de>
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L: linux-kernel@vger.kernel.org
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@ -175,4 +175,33 @@ config SENSORS_HMC5843_SPI
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- hmc5843_core (core functions)
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- hmc5843_spi (support for HMC5983)
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config SENSORS_RM3100
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tristate
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select IIO_BUFFER
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select IIO_TRIGGERED_BUFFER
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config SENSORS_RM3100_I2C
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tristate "PNI RM3100 3-Axis Magnetometer (I2C)"
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depends on I2C
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select SENSORS_RM3100
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select REGMAP_I2C
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help
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Say Y here to add support for the PNI RM3100 3-Axis Magnetometer.
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This driver can also be compiled as a module.
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To compile this driver as a module, choose M here: the module
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will be called rm3100-i2c.
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config SENSORS_RM3100_SPI
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tristate "PNI RM3100 3-Axis Magnetometer (SPI)"
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depends on SPI_MASTER
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select SENSORS_RM3100
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select REGMAP_SPI
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help
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Say Y here to add support for the PNI RM3100 3-Axis Magnetometer.
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This driver can also be compiled as a module.
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To compile this driver as a module, choose M here: the module
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will be called rm3100-spi.
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endmenu
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@ -24,3 +24,7 @@ obj-$(CONFIG_IIO_ST_MAGN_SPI_3AXIS) += st_magn_spi.o
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obj-$(CONFIG_SENSORS_HMC5843) += hmc5843_core.o
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obj-$(CONFIG_SENSORS_HMC5843_I2C) += hmc5843_i2c.o
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obj-$(CONFIG_SENSORS_HMC5843_SPI) += hmc5843_spi.o
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obj-$(CONFIG_SENSORS_RM3100) += rm3100-core.o
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obj-$(CONFIG_SENSORS_RM3100_I2C) += rm3100-i2c.o
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obj-$(CONFIG_SENSORS_RM3100_SPI) += rm3100-spi.o
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@ -0,0 +1,616 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* PNI RM3100 3-axis geomagnetic sensor driver core.
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*
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* Copyright (C) 2018 Song Qiang <songqiang1304521@gmail.com>
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*
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* User Manual available at
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* <https://www.pnicorp.com/download/rm3100-user-manual/>
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*
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* TODO: event generation, pm.
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*/
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/trigger_consumer.h>
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#include "rm3100.h"
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/* Cycle Count Registers. */
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#define RM3100_REG_CC_X 0x05
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#define RM3100_REG_CC_Y 0x07
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#define RM3100_REG_CC_Z 0x09
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/* Poll Measurement Mode register. */
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#define RM3100_REG_POLL 0x00
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#define RM3100_POLL_X BIT(4)
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#define RM3100_POLL_Y BIT(5)
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#define RM3100_POLL_Z BIT(6)
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/* Continuous Measurement Mode register. */
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#define RM3100_REG_CMM 0x01
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#define RM3100_CMM_START BIT(0)
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#define RM3100_CMM_X BIT(4)
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#define RM3100_CMM_Y BIT(5)
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#define RM3100_CMM_Z BIT(6)
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/* TiMe Rate Configuration register. */
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#define RM3100_REG_TMRC 0x0B
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#define RM3100_TMRC_OFFSET 0x92
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/* Result Status register. */
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#define RM3100_REG_STATUS 0x34
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#define RM3100_STATUS_DRDY BIT(7)
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/* Measurement result registers. */
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#define RM3100_REG_MX2 0x24
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#define RM3100_REG_MY2 0x27
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#define RM3100_REG_MZ2 0x2a
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#define RM3100_W_REG_START RM3100_REG_POLL
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#define RM3100_W_REG_END RM3100_REG_TMRC
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#define RM3100_R_REG_START RM3100_REG_POLL
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#define RM3100_R_REG_END RM3100_REG_STATUS
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#define RM3100_V_REG_START RM3100_REG_POLL
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#define RM3100_V_REG_END RM3100_REG_STATUS
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/*
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* This is computed by hand, is the sum of channel storage bits and padding
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* bits, which is 4+4+4+12=24 in here.
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*/
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#define RM3100_SCAN_BYTES 24
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#define RM3100_CMM_AXIS_SHIFT 4
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struct rm3100_data {
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struct regmap *regmap;
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struct completion measuring_done;
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bool use_interrupt;
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int conversion_time;
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int scale;
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u8 buffer[RM3100_SCAN_BYTES];
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struct iio_trigger *drdy_trig;
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/*
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* This lock is for protecting the consistency of series of i2c
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* operations, that is, to make sure a measurement process will
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* not be interrupted by a set frequency operation, which should
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* be taken where a series of i2c operation starts, released where
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* the operation ends.
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*/
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struct mutex lock;
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};
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static const struct regmap_range rm3100_readable_ranges[] = {
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regmap_reg_range(RM3100_R_REG_START, RM3100_R_REG_END),
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};
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const struct regmap_access_table rm3100_readable_table = {
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.yes_ranges = rm3100_readable_ranges,
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.n_yes_ranges = ARRAY_SIZE(rm3100_readable_ranges),
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};
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EXPORT_SYMBOL_GPL(rm3100_readable_table);
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static const struct regmap_range rm3100_writable_ranges[] = {
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regmap_reg_range(RM3100_W_REG_START, RM3100_W_REG_END),
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};
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const struct regmap_access_table rm3100_writable_table = {
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.yes_ranges = rm3100_writable_ranges,
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.n_yes_ranges = ARRAY_SIZE(rm3100_writable_ranges),
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};
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EXPORT_SYMBOL_GPL(rm3100_writable_table);
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static const struct regmap_range rm3100_volatile_ranges[] = {
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regmap_reg_range(RM3100_V_REG_START, RM3100_V_REG_END),
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};
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const struct regmap_access_table rm3100_volatile_table = {
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.yes_ranges = rm3100_volatile_ranges,
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.n_yes_ranges = ARRAY_SIZE(rm3100_volatile_ranges),
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};
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EXPORT_SYMBOL_GPL(rm3100_volatile_table);
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static irqreturn_t rm3100_thread_fn(int irq, void *d)
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{
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struct iio_dev *indio_dev = d;
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struct rm3100_data *data = iio_priv(indio_dev);
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/*
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* Write operation to any register or read operation
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* to first byte of results will clear the interrupt.
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*/
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regmap_write(data->regmap, RM3100_REG_POLL, 0);
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return IRQ_HANDLED;
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}
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static irqreturn_t rm3100_irq_handler(int irq, void *d)
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{
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struct iio_dev *indio_dev = d;
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struct rm3100_data *data = iio_priv(indio_dev);
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switch (indio_dev->currentmode) {
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case INDIO_DIRECT_MODE:
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complete(&data->measuring_done);
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break;
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case INDIO_BUFFER_TRIGGERED:
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iio_trigger_poll(data->drdy_trig);
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break;
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default:
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dev_err(indio_dev->dev.parent,
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"device mode out of control, current mode: %d",
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indio_dev->currentmode);
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}
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return IRQ_WAKE_THREAD;
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}
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static int rm3100_wait_measurement(struct rm3100_data *data)
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{
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struct regmap *regmap = data->regmap;
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unsigned int val;
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int tries = 20;
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int ret;
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/*
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* A read cycle of 400kbits i2c bus is about 20us, plus the time
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* used for scheduling, a read cycle of fast mode of this device
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* can reach 1.7ms, it may be possible for data to arrive just
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* after we check the RM3100_REG_STATUS. In this case, irq_handler is
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* called before measuring_done is reinitialized, it will wait
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* forever for data that has already been ready.
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* Reinitialize measuring_done before looking up makes sure we
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* will always capture interrupt no matter when it happens.
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*/
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if (data->use_interrupt)
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reinit_completion(&data->measuring_done);
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ret = regmap_read(regmap, RM3100_REG_STATUS, &val);
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if (ret < 0)
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return ret;
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if ((val & RM3100_STATUS_DRDY) != RM3100_STATUS_DRDY) {
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if (data->use_interrupt) {
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ret = wait_for_completion_timeout(&data->measuring_done,
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msecs_to_jiffies(data->conversion_time));
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if (!ret)
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return -ETIMEDOUT;
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} else {
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do {
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usleep_range(1000, 5000);
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ret = regmap_read(regmap, RM3100_REG_STATUS,
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&val);
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if (ret < 0)
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return ret;
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if (val & RM3100_STATUS_DRDY)
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break;
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} while (--tries);
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if (!tries)
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return -ETIMEDOUT;
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}
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}
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return 0;
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}
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static int rm3100_read_mag(struct rm3100_data *data, int idx, int *val)
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{
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struct regmap *regmap = data->regmap;
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u8 buffer[3];
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int ret;
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mutex_lock(&data->lock);
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ret = regmap_write(regmap, RM3100_REG_POLL, BIT(4 + idx));
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if (ret < 0)
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goto unlock_return;
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ret = rm3100_wait_measurement(data);
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if (ret < 0)
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goto unlock_return;
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ret = regmap_bulk_read(regmap, RM3100_REG_MX2 + 3 * idx, buffer, 3);
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if (ret < 0)
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goto unlock_return;
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mutex_unlock(&data->lock);
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*val = sign_extend32((buffer[0] << 16) | (buffer[1] << 8) | buffer[2],
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23);
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return IIO_VAL_INT;
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unlock_return:
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mutex_unlock(&data->lock);
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return ret;
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}
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#define RM3100_CHANNEL(axis, idx) \
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{ \
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.type = IIO_MAGN, \
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.modified = 1, \
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.channel2 = IIO_MOD_##axis, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
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BIT(IIO_CHAN_INFO_SAMP_FREQ), \
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.scan_index = idx, \
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.scan_type = { \
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.sign = 's', \
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.realbits = 24, \
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.storagebits = 32, \
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.shift = 8, \
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.endianness = IIO_BE, \
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}, \
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}
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static const struct iio_chan_spec rm3100_channels[] = {
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RM3100_CHANNEL(X, 0),
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RM3100_CHANNEL(Y, 1),
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RM3100_CHANNEL(Z, 2),
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IIO_CHAN_SOFT_TIMESTAMP(3),
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};
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static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
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"600 300 150 75 37 18 9 4.5 2.3 1.2 0.6 0.3 0.015 0.075"
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);
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static struct attribute *rm3100_attributes[] = {
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&iio_const_attr_sampling_frequency_available.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group rm3100_attribute_group = {
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.attrs = rm3100_attributes,
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};
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#define RM3100_SAMP_NUM 14
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/*
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* Frequency : rm3100_samp_rates[][0].rm3100_samp_rates[][1]Hz.
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* Time between reading: rm3100_sam_rates[][2]ms.
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* The first one is actually 1.7ms.
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*/
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static const int rm3100_samp_rates[RM3100_SAMP_NUM][3] = {
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{600, 0, 2}, {300, 0, 3}, {150, 0, 7}, {75, 0, 13}, {37, 0, 27},
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{18, 0, 55}, {9, 0, 110}, {4, 500000, 220}, {2, 300000, 440},
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{1, 200000, 800}, {0, 600000, 1600}, {0, 300000, 3300},
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{0, 15000, 6700}, {0, 75000, 13000}
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};
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static int rm3100_get_samp_freq(struct rm3100_data *data, int *val, int *val2)
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{
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unsigned int tmp;
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int ret;
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mutex_lock(&data->lock);
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ret = regmap_read(data->regmap, RM3100_REG_TMRC, &tmp);
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mutex_unlock(&data->lock);
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if (ret < 0)
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return ret;
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*val = rm3100_samp_rates[tmp - RM3100_TMRC_OFFSET][0];
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*val2 = rm3100_samp_rates[tmp - RM3100_TMRC_OFFSET][1];
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return IIO_VAL_INT_PLUS_MICRO;
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}
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static int rm3100_set_cycle_count(struct rm3100_data *data, int val)
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{
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int ret;
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u8 i;
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for (i = 0; i < 3; i++) {
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ret = regmap_write(data->regmap, RM3100_REG_CC_X + 2 * i, val);
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if (ret < 0)
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return ret;
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}
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/*
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* The scale of this sensor depends on the cycle count value, these
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* three values are corresponding to the cycle count value 50, 100,
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* 200. scale = output / gain * 10^4.
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*/
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switch (val) {
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case 50:
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data->scale = 500;
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break;
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case 100:
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data->scale = 263;
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break;
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/*
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* case 200:
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* This function will never be called by users' code, so here we
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* assume that it will never get a wrong parameter.
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*/
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default:
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data->scale = 133;
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}
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return 0;
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}
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static int rm3100_set_samp_freq(struct iio_dev *indio_dev, int val, int val2)
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{
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struct rm3100_data *data = iio_priv(indio_dev);
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struct regmap *regmap = data->regmap;
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unsigned int cycle_count;
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int ret;
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int i;
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mutex_lock(&data->lock);
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/* All cycle count registers use the same value. */
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ret = regmap_read(regmap, RM3100_REG_CC_X, &cycle_count);
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if (ret < 0)
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goto unlock_return;
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for (i = 0; i < RM3100_SAMP_NUM; i++) {
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if (val == rm3100_samp_rates[i][0] &&
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val2 == rm3100_samp_rates[i][1])
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break;
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}
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if (i == RM3100_SAMP_NUM) {
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ret = -EINVAL;
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goto unlock_return;
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}
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ret = regmap_write(regmap, RM3100_REG_TMRC, i + RM3100_TMRC_OFFSET);
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if (ret < 0)
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goto unlock_return;
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/* Checking if cycle count registers need changing. */
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if (val == 600 && cycle_count == 200) {
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ret = rm3100_set_cycle_count(data, 100);
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if (ret < 0)
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goto unlock_return;
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} else if (val != 600 && cycle_count == 100) {
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ret = rm3100_set_cycle_count(data, 200);
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if (ret < 0)
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goto unlock_return;
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}
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if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
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/* Writing TMRC registers requires CMM reset. */
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ret = regmap_write(regmap, RM3100_REG_CMM, 0);
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if (ret < 0)
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goto unlock_return;
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ret = regmap_write(data->regmap, RM3100_REG_CMM,
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(*indio_dev->active_scan_mask & 0x7) <<
|
||||
RM3100_CMM_AXIS_SHIFT | RM3100_CMM_START);
|
||||
if (ret < 0)
|
||||
goto unlock_return;
|
||||
}
|
||||
mutex_unlock(&data->lock);
|
||||
|
||||
data->conversion_time = rm3100_samp_rates[i][2] * 2;
|
||||
return 0;
|
||||
|
||||
unlock_return:
|
||||
mutex_unlock(&data->lock);
|
||||
return ret;
|
||||
}
|
||||
|
||||
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_SCALE:
|
||||
*val = 0;
|
||||
*val2 = data->scale;
|
||||
|
||||
return IIO_VAL_INT_PLUS_MICRO;
|
||||
case IIO_CHAN_INFO_SAMP_FREQ:
|
||||
return 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)
|
||||
{
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_SAMP_FREQ:
|
||||
return rm3100_set_samp_freq(indio_dev, val, val2);
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static const struct iio_info rm3100_info = {
|
||||
.attrs = &rm3100_attribute_group,
|
||||
.read_raw = rm3100_read_raw,
|
||||
.write_raw = rm3100_write_raw,
|
||||
};
|
||||
|
||||
static int rm3100_buffer_preenable(struct iio_dev *indio_dev)
|
||||
{
|
||||
struct rm3100_data *data = iio_priv(indio_dev);
|
||||
|
||||
/* Starting channels enabled. */
|
||||
return regmap_write(data->regmap, RM3100_REG_CMM,
|
||||
(*indio_dev->active_scan_mask & 0x7) << RM3100_CMM_AXIS_SHIFT |
|
||||
RM3100_CMM_START);
|
||||
}
|
||||
|
||||
static int rm3100_buffer_postdisable(struct iio_dev *indio_dev)
|
||||
{
|
||||
struct rm3100_data *data = iio_priv(indio_dev);
|
||||
|
||||
return regmap_write(data->regmap, RM3100_REG_CMM, 0);
|
||||
}
|
||||
|
||||
static const struct iio_buffer_setup_ops rm3100_buffer_ops = {
|
||||
.preenable = rm3100_buffer_preenable,
|
||||
.postenable = iio_triggered_buffer_postenable,
|
||||
.predisable = iio_triggered_buffer_predisable,
|
||||
.postdisable = rm3100_buffer_postdisable,
|
||||
};
|
||||
|
||||
static irqreturn_t rm3100_trigger_handler(int irq, void *p)
|
||||
{
|
||||
struct iio_poll_func *pf = p;
|
||||
struct iio_dev *indio_dev = pf->indio_dev;
|
||||
unsigned long scan_mask = *indio_dev->active_scan_mask;
|
||||
unsigned int mask_len = indio_dev->masklength;
|
||||
struct rm3100_data *data = iio_priv(indio_dev);
|
||||
struct regmap *regmap = data->regmap;
|
||||
int ret, i, bit;
|
||||
|
||||
mutex_lock(&data->lock);
|
||||
switch (scan_mask) {
|
||||
case BIT(0) | BIT(1) | BIT(2):
|
||||
ret = regmap_bulk_read(regmap, RM3100_REG_MX2, data->buffer, 9);
|
||||
mutex_unlock(&data->lock);
|
||||
if (ret < 0)
|
||||
goto done;
|
||||
/* Convert XXXYYYZZZxxx to XXXxYYYxZZZx. x for paddings. */
|
||||
for (i = 2; i > 0; i--)
|
||||
memmove(data->buffer + i * 4, data->buffer + i * 3, 3);
|
||||
break;
|
||||
case BIT(0) | BIT(1):
|
||||
ret = regmap_bulk_read(regmap, RM3100_REG_MX2, data->buffer, 6);
|
||||
mutex_unlock(&data->lock);
|
||||
if (ret < 0)
|
||||
goto done;
|
||||
memmove(data->buffer + 4, data->buffer + 3, 3);
|
||||
break;
|
||||
case BIT(1) | BIT(2):
|
||||
ret = regmap_bulk_read(regmap, RM3100_REG_MY2, data->buffer, 6);
|
||||
mutex_unlock(&data->lock);
|
||||
if (ret < 0)
|
||||
goto done;
|
||||
memmove(data->buffer + 4, data->buffer + 3, 3);
|
||||
break;
|
||||
case BIT(0) | BIT(2):
|
||||
ret = regmap_bulk_read(regmap, RM3100_REG_MX2, data->buffer, 9);
|
||||
mutex_unlock(&data->lock);
|
||||
if (ret < 0)
|
||||
goto done;
|
||||
memmove(data->buffer + 4, data->buffer + 6, 3);
|
||||
break;
|
||||
default:
|
||||
for_each_set_bit(bit, &scan_mask, mask_len) {
|
||||
ret = regmap_bulk_read(regmap, RM3100_REG_MX2 + 3 * bit,
|
||||
data->buffer, 3);
|
||||
if (ret < 0) {
|
||||
mutex_unlock(&data->lock);
|
||||
goto done;
|
||||
}
|
||||
}
|
||||
mutex_unlock(&data->lock);
|
||||
}
|
||||
/*
|
||||
* Always using the same buffer so that we wouldn't need to set the
|
||||
* paddings to 0 in case of leaking any data.
|
||||
*/
|
||||
iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
|
||||
pf->timestamp);
|
||||
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;
|
||||
unsigned int tmp;
|
||||
int ret;
|
||||
|
||||
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
|
||||
if (!indio_dev)
|
||||
return -ENOMEM;
|
||||
|
||||
data = iio_priv(indio_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_BUFFER_TRIGGERED;
|
||||
indio_dev->currentmode = INDIO_DIRECT_MODE;
|
||||
|
||||
if (!irq)
|
||||
data->use_interrupt = false;
|
||||
else {
|
||||
data->use_interrupt = true;
|
||||
|
||||
init_completion(&data->measuring_done);
|
||||
ret = devm_request_threaded_irq(dev,
|
||||
irq,
|
||||
rm3100_irq_handler,
|
||||
rm3100_thread_fn,
|
||||
IRQF_TRIGGER_HIGH |
|
||||
IRQF_ONESHOT,
|
||||
indio_dev->name,
|
||||
indio_dev);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "request irq line failed.\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
data->drdy_trig = devm_iio_trigger_alloc(dev, "%s-drdy%d",
|
||||
indio_dev->name,
|
||||
indio_dev->id);
|
||||
if (!data->drdy_trig)
|
||||
return -ENOMEM;
|
||||
|
||||
data->drdy_trig->dev.parent = dev;
|
||||
ret = devm_iio_trigger_register(dev, data->drdy_trig);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
|
||||
&iio_pollfunc_store_time,
|
||||
rm3100_trigger_handler,
|
||||
&rm3100_buffer_ops);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = regmap_read(regmap, RM3100_REG_TMRC, &tmp);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
/* Initializing max wait time, which is double conversion time. */
|
||||
data->conversion_time = rm3100_samp_rates[tmp - RM3100_TMRC_OFFSET][2]
|
||||
* 2;
|
||||
|
||||
/* Cycle count values may not be what we want. */
|
||||
if ((tmp - RM3100_TMRC_OFFSET) == 0)
|
||||
rm3100_set_cycle_count(data, 100);
|
||||
else
|
||||
rm3100_set_cycle_count(data, 200);
|
||||
|
||||
return devm_iio_device_register(dev, indio_dev);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(rm3100_common_probe);
|
||||
|
||||
MODULE_AUTHOR("Song Qiang <songqiang1304521@gmail.com>");
|
||||
MODULE_DESCRIPTION("PNI RM3100 3-axis magnetometer i2c driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,54 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
/*
|
||||
* Support for PNI RM3100 3-axis geomagnetic sensor on a i2c bus.
|
||||
*
|
||||
* Copyright (C) 2018 Song Qiang <songqiang1304521@gmail.com>
|
||||
*
|
||||
* i2c slave address: 0x20 + SA1 << 1 + SA0.
|
||||
*/
|
||||
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/module.h>
|
||||
|
||||
#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;
|
||||
|
||||
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 const struct of_device_id rm3100_dt_match[] = {
|
||||
{ .compatible = "pni,rm3100", },
|
||||
{ }
|
||||
};
|
||||
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,
|
||||
};
|
||||
module_i2c_driver(rm3100_driver);
|
||||
|
||||
MODULE_AUTHOR("Song Qiang <songqiang1304521@gmail.com>");
|
||||
MODULE_DESCRIPTION("PNI RM3100 3-axis magnetometer i2c driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,64 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
/*
|
||||
* Support for PNI RM3100 3-axis geomagnetic sensor on a spi bus.
|
||||
*
|
||||
* Copyright (C) 2018 Song Qiang <songqiang1304521@gmail.com>
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/spi/spi.h>
|
||||
|
||||
#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 exceed 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 const struct of_device_id rm3100_dt_match[] = {
|
||||
{ .compatible = "pni,rm3100", },
|
||||
{ }
|
||||
};
|
||||
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,
|
||||
};
|
||||
module_spi_driver(rm3100_driver);
|
||||
|
||||
MODULE_AUTHOR("Song Qiang <songqiang1304521@gmail.com>");
|
||||
MODULE_DESCRIPTION("PNI RM3100 3-axis magnetometer spi driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,17 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
/*
|
||||
* Copyright (C) 2018 Song Qiang <songqiang1304521@gmail.com>
|
||||
*/
|
||||
|
||||
#ifndef RM3100_CORE_H
|
||||
#define RM3100_CORE_H
|
||||
|
||||
#include <linux/regmap.h>
|
||||
|
||||
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);
|
||||
|
||||
#endif /* RM3100_CORE_H */
|
||||
Loading…
Reference in New Issue