forked from Minki/linux
iio: accel: add Freescale MMA7455L/MMA7456L 3-axis accelerometer driver
Add support for Freescale MMA7455L/MMA7456L 3-axis in 10-bit mode for I2C and SPI bus. This rather simple driver that currently doesn't support all the hardware features of MMA7455L/MMA7456L. Tested on Embedded Artist's LPC4357 Dev Kit with MMA7455L on I2C bus. Data sheets for the two devices can be found here: http://cache.freescale.com/files/sensors/doc/data_sheet/MMA7455L.pdf http://cache.freescale.com/files/sensors/doc/data_sheet/MMA7456L.pdf Signed-off-by: Joachim Eastwood <manabian@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Joachim Eastwood
Jonathan Cameron
parent
18fb1ab0eb
commit
a84ef0d181
@ -107,6 +107,35 @@ config KXCJK1013
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To compile this driver as a module, choose M here: the module will
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be called kxcjk-1013.
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config MMA7455
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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 MMA7455_I2C
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tristate "Freescale MMA7455L/MMA7456L Accelerometer I2C Driver"
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depends on I2C
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select MMA7455
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select REGMAP_I2C
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help
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Say yes here to build support for the Freescale MMA7455L and
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MMA7456L 3-axis accelerometer.
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To compile this driver as a module, choose M here: the module
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will be called mma7455_i2c.
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config MMA7455_SPI
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tristate "Freescale MMA7455L/MMA7456L Accelerometer SPI Driver"
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depends on SPI_MASTER
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select MMA7455
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select REGMAP_SPI
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help
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Say yes here to build support for the Freescale MMA7455L and
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MMA7456L 3-axis accelerometer.
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To compile this driver as a module, choose M here: the module
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will be called mma7455_spi.
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config MMA8452
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tristate "Freescale MMA8452Q and similar Accelerometers Driver"
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depends on I2C
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@ -10,6 +10,11 @@ obj-$(CONFIG_BMC150_ACCEL_SPI) += bmc150-accel-spi.o
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obj-$(CONFIG_HID_SENSOR_ACCEL_3D) += hid-sensor-accel-3d.o
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obj-$(CONFIG_KXCJK1013) += kxcjk-1013.o
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obj-$(CONFIG_KXSD9) += kxsd9.o
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obj-$(CONFIG_MMA7455) += mma7455_core.o
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obj-$(CONFIG_MMA7455_I2C) += mma7455_i2c.o
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obj-$(CONFIG_MMA7455_SPI) += mma7455_spi.o
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obj-$(CONFIG_MMA8452) += mma8452.o
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obj-$(CONFIG_MMA9551_CORE) += mma9551_core.o
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19
drivers/iio/accel/mma7455.h
Normal file
19
drivers/iio/accel/mma7455.h
Normal file
@ -0,0 +1,19 @@
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/*
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* IIO accel driver for Freescale MMA7455L 3-axis 10-bit accelerometer
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* Copyright 2015 Joachim Eastwood <manabian@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __MMA7455_H
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#define __MMA7455_H
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extern const struct regmap_config mma7455_core_regmap;
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int mma7455_core_probe(struct device *dev, struct regmap *regmap,
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const char *name);
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int mma7455_core_remove(struct device *dev);
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#endif
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311
drivers/iio/accel/mma7455_core.c
Normal file
311
drivers/iio/accel/mma7455_core.c
Normal file
@ -0,0 +1,311 @@
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/*
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* IIO accel core driver for Freescale MMA7455L 3-axis 10-bit accelerometer
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* Copyright 2015 Joachim Eastwood <manabian@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* UNSUPPORTED hardware features:
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* - 8-bit mode with different scales
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* - INT1/INT2 interrupts
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* - Offset calibration
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* - Events
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*/
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#include <linux/delay.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/buffer.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include "mma7455.h"
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#define MMA7455_REG_XOUTL 0x00
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#define MMA7455_REG_XOUTH 0x01
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#define MMA7455_REG_YOUTL 0x02
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#define MMA7455_REG_YOUTH 0x03
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#define MMA7455_REG_ZOUTL 0x04
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#define MMA7455_REG_ZOUTH 0x05
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#define MMA7455_REG_STATUS 0x09
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#define MMA7455_STATUS_DRDY BIT(0)
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#define MMA7455_REG_WHOAMI 0x0f
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#define MMA7455_WHOAMI_ID 0x55
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#define MMA7455_REG_MCTL 0x16
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#define MMA7455_MCTL_MODE_STANDBY 0x00
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#define MMA7455_MCTL_MODE_MEASURE 0x01
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#define MMA7455_REG_CTL1 0x18
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#define MMA7455_CTL1_DFBW_MASK BIT(7)
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#define MMA7455_CTL1_DFBW_125HZ BIT(7)
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#define MMA7455_CTL1_DFBW_62_5HZ 0
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#define MMA7455_REG_TW 0x1e
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/*
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* When MMA7455 is used in 10-bit it has a fullscale of -8g
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* corresponding to raw value -512. The userspace interface
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* uses m/s^2 and we declare micro units.
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* So scale factor is given by:
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* g * 8 * 1e6 / 512 = 153228.90625, with g = 9.80665
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*/
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#define MMA7455_10BIT_SCALE 153229
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struct mma7455_data {
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struct regmap *regmap;
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struct device *dev;
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};
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static int mma7455_drdy(struct mma7455_data *mma7455)
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{
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unsigned int reg;
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int tries = 3;
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int ret;
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while (tries-- > 0) {
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ret = regmap_read(mma7455->regmap, MMA7455_REG_STATUS, ®);
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if (ret)
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return ret;
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if (reg & MMA7455_STATUS_DRDY)
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return 0;
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msleep(20);
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}
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dev_warn(mma7455->dev, "data not ready\n");
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return -EIO;
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}
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static irqreturn_t mma7455_trigger_handler(int irq, void *p)
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{
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struct iio_poll_func *pf = p;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct mma7455_data *mma7455 = iio_priv(indio_dev);
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u8 buf[16]; /* 3 x 16-bit channels + padding + ts */
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int ret;
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ret = mma7455_drdy(mma7455);
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if (ret)
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goto done;
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ret = regmap_bulk_read(mma7455->regmap, MMA7455_REG_XOUTL, buf,
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sizeof(__le16) * 3);
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if (ret)
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goto done;
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iio_push_to_buffers_with_timestamp(indio_dev, buf, iio_get_time_ns());
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done:
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iio_trigger_notify_done(indio_dev->trig);
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return IRQ_HANDLED;
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}
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static int mma7455_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct mma7455_data *mma7455 = iio_priv(indio_dev);
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unsigned int reg;
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__le16 data;
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (iio_buffer_enabled(indio_dev))
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return -EBUSY;
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ret = mma7455_drdy(mma7455);
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if (ret)
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return ret;
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ret = regmap_bulk_read(mma7455->regmap, chan->address, &data,
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sizeof(data));
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if (ret)
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return ret;
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*val = sign_extend32(le16_to_cpu(data), 9);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = 0;
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*val2 = MMA7455_10BIT_SCALE;
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_CHAN_INFO_SAMP_FREQ:
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ret = regmap_read(mma7455->regmap, MMA7455_REG_CTL1, ®);
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if (ret)
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return ret;
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if (reg & MMA7455_CTL1_DFBW_MASK)
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*val = 250;
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else
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*val = 125;
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return IIO_VAL_INT;
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}
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return -EINVAL;
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}
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static int mma7455_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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struct mma7455_data *mma7455 = iio_priv(indio_dev);
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int i;
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switch (mask) {
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case IIO_CHAN_INFO_SAMP_FREQ:
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if (val == 250 && val2 == 0)
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i = MMA7455_CTL1_DFBW_125HZ;
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else if (val == 125 && val2 == 0)
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i = MMA7455_CTL1_DFBW_62_5HZ;
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else
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return -EINVAL;
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return regmap_update_bits(mma7455->regmap, MMA7455_REG_CTL1,
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MMA7455_CTL1_DFBW_MASK, i);
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case IIO_CHAN_INFO_SCALE:
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/* In 10-bit mode there is only one scale available */
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if (val == 0 && val2 == MMA7455_10BIT_SCALE)
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return 0;
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break;
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}
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return -EINVAL;
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}
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static IIO_CONST_ATTR(sampling_frequency_available, "125 250");
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static struct attribute *mma7455_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 mma7455_group = {
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.attrs = mma7455_attributes,
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};
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static const struct iio_info mma7455_info = {
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.attrs = &mma7455_group,
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.read_raw = mma7455_read_raw,
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.write_raw = mma7455_write_raw,
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.driver_module = THIS_MODULE,
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};
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#define MMA7455_CHANNEL(axis, idx) { \
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.type = IIO_ACCEL, \
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.modified = 1, \
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.address = MMA7455_REG_##axis##OUTL,\
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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_SAMP_FREQ) | \
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BIT(IIO_CHAN_INFO_SCALE), \
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.scan_index = idx, \
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.scan_type = { \
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.sign = 's', \
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.realbits = 10, \
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.storagebits = 16, \
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.endianness = IIO_LE, \
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}, \
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}
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static const struct iio_chan_spec mma7455_channels[] = {
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MMA7455_CHANNEL(X, 0),
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MMA7455_CHANNEL(Y, 1),
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MMA7455_CHANNEL(Z, 2),
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IIO_CHAN_SOFT_TIMESTAMP(3),
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};
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static const unsigned long mma7455_scan_masks[] = {0x7, 0};
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const struct regmap_config mma7455_core_regmap = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = MMA7455_REG_TW,
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};
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EXPORT_SYMBOL_GPL(mma7455_core_regmap);
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int mma7455_core_probe(struct device *dev, struct regmap *regmap,
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const char *name)
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{
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struct mma7455_data *mma7455;
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struct iio_dev *indio_dev;
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unsigned int reg;
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int ret;
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ret = regmap_read(regmap, MMA7455_REG_WHOAMI, ®);
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if (ret) {
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dev_err(dev, "unable to read reg\n");
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return ret;
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}
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if (reg != MMA7455_WHOAMI_ID) {
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dev_err(dev, "device id mismatch\n");
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return -ENODEV;
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}
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indio_dev = devm_iio_device_alloc(dev, sizeof(*mma7455));
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if (!indio_dev)
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return -ENOMEM;
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dev_set_drvdata(dev, indio_dev);
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mma7455 = iio_priv(indio_dev);
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mma7455->regmap = regmap;
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mma7455->dev = dev;
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indio_dev->info = &mma7455_info;
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indio_dev->name = name;
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indio_dev->dev.parent = dev;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = mma7455_channels;
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indio_dev->num_channels = ARRAY_SIZE(mma7455_channels);
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indio_dev->available_scan_masks = mma7455_scan_masks;
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regmap_write(mma7455->regmap, MMA7455_REG_MCTL,
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MMA7455_MCTL_MODE_MEASURE);
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ret = iio_triggered_buffer_setup(indio_dev, NULL,
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mma7455_trigger_handler, NULL);
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if (ret) {
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dev_err(dev, "unable to setup triggered buffer\n");
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return ret;
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}
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ret = iio_device_register(indio_dev);
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if (ret) {
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dev_err(dev, "unable to register device\n");
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iio_triggered_buffer_cleanup(indio_dev);
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(mma7455_core_probe);
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int mma7455_core_remove(struct device *dev)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct mma7455_data *mma7455 = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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iio_triggered_buffer_cleanup(indio_dev);
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regmap_write(mma7455->regmap, MMA7455_REG_MCTL,
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MMA7455_MCTL_MODE_STANDBY);
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return 0;
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}
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EXPORT_SYMBOL_GPL(mma7455_core_remove);
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MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
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MODULE_DESCRIPTION("Freescale MMA7455L core accelerometer driver");
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MODULE_LICENSE("GPL v2");
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56
drivers/iio/accel/mma7455_i2c.c
Normal file
56
drivers/iio/accel/mma7455_i2c.c
Normal file
@ -0,0 +1,56 @@
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/*
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* IIO accel I2C driver for Freescale MMA7455L 3-axis 10-bit accelerometer
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* Copyright 2015 Joachim Eastwood <manabian@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include "mma7455.h"
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static int mma7455_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct regmap *regmap;
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const char *name = NULL;
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regmap = devm_regmap_init_i2c(i2c, &mma7455_core_regmap);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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if (id)
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name = id->name;
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return mma7455_core_probe(&i2c->dev, regmap, name);
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}
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static int mma7455_i2c_remove(struct i2c_client *i2c)
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{
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return mma7455_core_remove(&i2c->dev);
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}
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static const struct i2c_device_id mma7455_i2c_ids[] = {
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{ "mma7455", 0 },
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{ "mma7456", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, mma7455_i2c_ids);
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static struct i2c_driver mma7455_i2c_driver = {
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.probe = mma7455_i2c_probe,
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.remove = mma7455_i2c_remove,
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.id_table = mma7455_i2c_ids,
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.driver = {
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.name = "mma7455-i2c",
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},
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};
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module_i2c_driver(mma7455_i2c_driver);
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MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
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MODULE_DESCRIPTION("Freescale MMA7455L I2C accelerometer driver");
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MODULE_LICENSE("GPL v2");
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52
drivers/iio/accel/mma7455_spi.c
Normal file
52
drivers/iio/accel/mma7455_spi.c
Normal file
@ -0,0 +1,52 @@
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/*
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* IIO accel SPI driver for Freescale MMA7455L 3-axis 10-bit accelerometer
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* Copyright 2015 Joachim Eastwood <manabian@gmail.com>
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*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/regmap.h>
|
||||
#include <linux/spi/spi.h>
|
||||
|
||||
#include "mma7455.h"
|
||||
|
||||
static int mma7455_spi_probe(struct spi_device *spi)
|
||||
{
|
||||
const struct spi_device_id *id = spi_get_device_id(spi);
|
||||
struct regmap *regmap;
|
||||
|
||||
regmap = devm_regmap_init_spi(spi, &mma7455_core_regmap);
|
||||
if (IS_ERR(regmap))
|
||||
return PTR_ERR(regmap);
|
||||
|
||||
return mma7455_core_probe(&spi->dev, regmap, id->name);
|
||||
}
|
||||
|
||||
static int mma7455_spi_remove(struct spi_device *spi)
|
||||
{
|
||||
return mma7455_core_remove(&spi->dev);
|
||||
}
|
||||
|
||||
static const struct spi_device_id mma7455_spi_ids[] = {
|
||||
{ "mma7455", 0 },
|
||||
{ "mma7456", 0 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(spi, mma7455_spi_ids);
|
||||
|
||||
static struct spi_driver mma7455_spi_driver = {
|
||||
.probe = mma7455_spi_probe,
|
||||
.remove = mma7455_spi_remove,
|
||||
.id_table = mma7455_spi_ids,
|
||||
.driver = {
|
||||
.name = "mma7455-spi",
|
||||
},
|
||||
};
|
||||
module_spi_driver(mma7455_spi_driver);
|
||||
|
||||
MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
|
||||
MODULE_DESCRIPTION("Freescale MMA7455L SPI accelerometer driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user