iio: accel: add support for mxc4005 accelerometer
This patch adds support for Memsic MXC4005XC 3-axis accelerometer. The current implementation is a minimal one as it adds raw readings for the three axes and setting scale from userspace. Signed-off-by: Teodora Baluta <teodora.baluta@intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Teodora Baluta
Jonathan Cameron
parent
b1d125cc62
commit
077377fc4f
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@ -137,6 +137,17 @@ config MMA9553
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To compile this driver as a module, choose M here: the module
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will be called mma9553.
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config MXC4005
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tristate "Memsic MXC4005XC 3-Axis Accelerometer Driver"
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depends on I2C
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select REGMAP_I2C
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help
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Say yes here to build support for the Memsic MXC4005XC 3-axis
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accelerometer.
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To compile this driver as a module, choose M. The module will be
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called mxc4005.
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config STK8312
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tristate "Sensortek STK8312 3-Axis Accelerometer Driver"
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depends on I2C
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@ -14,6 +14,8 @@ obj-$(CONFIG_MMA9551_CORE) += mma9551_core.o
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obj-$(CONFIG_MMA9551) += mma9551.o
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obj-$(CONFIG_MMA9553) += mma9553.o
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obj-$(CONFIG_MXC4005) += mxc4005.o
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obj-$(CONFIG_STK8312) += stk8312.o
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obj-$(CONFIG_STK8BA50) += stk8ba50.o
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@ -0,0 +1,354 @@
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/*
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* 3-axis accelerometer driver for MXC4005XC Memsic sensor
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*
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* Copyright (c) 2014, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/iio/iio.h>
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#include <linux/acpi.h>
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#include <linux/regmap.h>
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#include <linux/iio/sysfs.h>
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#define MXC4005_DRV_NAME "mxc4005"
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#define MXC4005_REGMAP_NAME "mxc4005_regmap"
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#define MXC4005_REG_XOUT_UPPER 0x03
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#define MXC4005_REG_XOUT_LOWER 0x04
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#define MXC4005_REG_YOUT_UPPER 0x05
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#define MXC4005_REG_YOUT_LOWER 0x06
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#define MXC4005_REG_ZOUT_UPPER 0x07
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#define MXC4005_REG_ZOUT_LOWER 0x08
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#define MXC4005_REG_CONTROL 0x0D
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#define MXC4005_REG_CONTROL_MASK_FSR GENMASK(6, 5)
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#define MXC4005_CONTROL_FSR_SHIFT 5
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#define MXC4005_REG_DEVICE_ID 0x0E
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enum mxc4005_axis {
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AXIS_X,
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AXIS_Y,
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AXIS_Z,
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};
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enum mxc4005_range {
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MXC4005_RANGE_2G,
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MXC4005_RANGE_4G,
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MXC4005_RANGE_8G,
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};
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struct mxc4005_data {
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struct device *dev;
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struct mutex mutex;
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struct regmap *regmap;
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};
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/*
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* MXC4005 can operate in the following ranges:
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* +/- 2G, 4G, 8G (the default +/-2G)
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*
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* (2 + 2) * 9.81 / (2^12 - 1) = 0.009582
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* (4 + 4) * 9.81 / (2^12 - 1) = 0.019164
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* (8 + 8) * 9.81 / (2^12 - 1) = 0.038329
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*/
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static const struct {
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u8 range;
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int scale;
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} mxc4005_scale_table[] = {
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{MXC4005_RANGE_2G, 9582},
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{MXC4005_RANGE_4G, 19164},
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{MXC4005_RANGE_8G, 38329},
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};
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static IIO_CONST_ATTR(in_accel_scale_available, "0.009582 0.019164 0.038329");
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static struct attribute *mxc4005_attributes[] = {
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&iio_const_attr_in_accel_scale_available.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group mxc4005_attrs_group = {
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.attrs = mxc4005_attributes,
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};
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static bool mxc4005_is_readable_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case MXC4005_REG_XOUT_UPPER:
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case MXC4005_REG_XOUT_LOWER:
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case MXC4005_REG_YOUT_UPPER:
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case MXC4005_REG_YOUT_LOWER:
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case MXC4005_REG_ZOUT_UPPER:
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case MXC4005_REG_ZOUT_LOWER:
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case MXC4005_REG_DEVICE_ID:
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case MXC4005_REG_CONTROL:
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return true;
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default:
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return false;
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}
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}
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static bool mxc4005_is_writeable_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case MXC4005_REG_CONTROL:
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return true;
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default:
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return false;
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}
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}
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static const struct regmap_config mxc4005_regmap_config = {
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.name = MXC4005_REGMAP_NAME,
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = MXC4005_REG_DEVICE_ID,
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.readable_reg = mxc4005_is_readable_reg,
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.writeable_reg = mxc4005_is_writeable_reg,
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};
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static int mxc4005_read_axis(struct mxc4005_data *data,
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unsigned int addr)
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{
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__be16 reg;
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int ret;
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ret = regmap_bulk_read(data->regmap, addr, (u8 *) ®, sizeof(reg));
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if (ret < 0) {
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dev_err(data->dev, "failed to read reg %02x\n", addr);
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return ret;
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}
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return be16_to_cpu(reg);
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}
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static int mxc4005_read_scale(struct mxc4005_data *data)
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{
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unsigned int reg;
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int ret;
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int i;
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ret = regmap_read(data->regmap, MXC4005_REG_CONTROL, ®);
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if (ret < 0) {
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dev_err(data->dev, "failed to read reg_control\n");
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return ret;
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}
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i = reg >> MXC4005_CONTROL_FSR_SHIFT;
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if (i < 0 || i >= ARRAY_SIZE(mxc4005_scale_table))
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return -EINVAL;
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return mxc4005_scale_table[i].scale;
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}
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static int mxc4005_set_scale(struct mxc4005_data *data, int val)
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{
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unsigned int reg;
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int i;
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int ret;
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for (i = 0; i < ARRAY_SIZE(mxc4005_scale_table); i++) {
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if (mxc4005_scale_table[i].scale == val) {
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reg = i << MXC4005_CONTROL_FSR_SHIFT;
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ret = regmap_update_bits(data->regmap,
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MXC4005_REG_CONTROL,
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MXC4005_REG_CONTROL_MASK_FSR,
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reg);
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if (ret < 0)
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dev_err(data->dev,
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"failed to write reg_control\n");
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return ret;
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}
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}
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return -EINVAL;
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}
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static int mxc4005_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 mxc4005_data *data = iio_priv(indio_dev);
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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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switch (chan->type) {
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case IIO_ACCEL:
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if (iio_buffer_enabled(indio_dev))
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return -EBUSY;
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ret = mxc4005_read_axis(data, chan->address);
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if (ret < 0)
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return ret;
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*val = sign_extend32(ret >> 4, 11);
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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case IIO_CHAN_INFO_SCALE:
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ret = mxc4005_read_scale(data);
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if (ret < 0)
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return ret;
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*val = 0;
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*val2 = ret;
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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}
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}
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static int mxc4005_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 mxc4005_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_SCALE:
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if (val != 0)
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return -EINVAL;
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return mxc4005_set_scale(data, val2);
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info mxc4005_info = {
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.driver_module = THIS_MODULE,
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.read_raw = mxc4005_read_raw,
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.write_raw = mxc4005_write_raw,
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.attrs = &mxc4005_attrs_group,
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};
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#define MXC4005_CHANNEL(_axis, _addr) { \
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.type = IIO_ACCEL, \
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.modified = 1, \
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.channel2 = IIO_MOD_##_axis, \
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.address = _addr, \
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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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}
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static const struct iio_chan_spec mxc4005_channels[] = {
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MXC4005_CHANNEL(X, MXC4005_REG_XOUT_UPPER),
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MXC4005_CHANNEL(Y, MXC4005_REG_YOUT_UPPER),
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MXC4005_CHANNEL(Z, MXC4005_REG_ZOUT_UPPER),
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};
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static int mxc4005_chip_init(struct mxc4005_data *data)
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{
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int ret;
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unsigned int reg;
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ret = regmap_read(data->regmap, MXC4005_REG_DEVICE_ID, ®);
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if (ret < 0) {
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dev_err(data->dev, "failed to read chip id\n");
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return ret;
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}
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dev_dbg(data->dev, "MXC4005 chip id %02x\n", reg);
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return 0;
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}
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static int mxc4005_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct mxc4005_data *data;
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struct iio_dev *indio_dev;
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struct regmap *regmap;
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int ret;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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regmap = devm_regmap_init_i2c(client, &mxc4005_regmap_config);
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if (IS_ERR(regmap)) {
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dev_err(&client->dev, "failed to initialize regmap\n");
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return PTR_ERR(regmap);
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}
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->dev = &client->dev;
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data->regmap = regmap;
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ret = mxc4005_chip_init(data);
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if (ret < 0) {
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dev_err(&client->dev, "failed to initialize chip\n");
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return ret;
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}
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mutex_init(&data->mutex);
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indio_dev->dev.parent = &client->dev;
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indio_dev->channels = mxc4005_channels;
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indio_dev->num_channels = ARRAY_SIZE(mxc4005_channels);
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indio_dev->name = MXC4005_DRV_NAME;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &mxc4005_info;
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ret = iio_device_register(indio_dev);
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if (ret < 0) {
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dev_err(&client->dev,
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"unable to register iio device %d\n", ret);
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return ret;
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}
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return 0;
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}
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static int mxc4005_remove(struct i2c_client *client)
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{
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iio_device_unregister(i2c_get_clientdata(client));
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return 0;
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}
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static const struct acpi_device_id mxc4005_acpi_match[] = {
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{"MXC4005", 0},
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{ },
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};
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MODULE_DEVICE_TABLE(acpi, mxc4005_acpi_match);
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static const struct i2c_device_id mxc4005_id[] = {
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{"mxc4005", 0},
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, mxc4005_id);
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static struct i2c_driver mxc4005_driver = {
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.driver = {
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.name = MXC4005_DRV_NAME,
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.acpi_match_table = ACPI_PTR(mxc4005_acpi_match),
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},
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.probe = mxc4005_probe,
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.remove = mxc4005_remove,
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.id_table = mxc4005_id,
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};
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module_i2c_driver(mxc4005_driver);
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MODULE_AUTHOR("Teodora Baluta <teodora.baluta@intel.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("MXC4005 3-axis accelerometer driver");
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