iio: accel: Add support for Sensortek STK8BA50
Minimal implementation of an IIO driver for the Sensortek STK8BA50 3-axis accelerometer. Datasheet: http://szgsensor.com/uploads/soft/141229/STK8BA50%D2%E5%BC%CE.pdf Includes: - ACPI support; - read_raw for x,y,z axes; - reading and setting the scale (range) parameter. - power management Signed-off-by: Tiberiu Breana <tiberiu.a.breana@intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Tiberiu Breana
Jonathan Cameron
Родитель
1250186a93
Коммит
884ca45613
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@ -147,4 +147,14 @@ config STK8312
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Choosing M will build the driver as a module. If so, the module
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will be called stk8312.
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config STK8BA50
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tristate "Sensortek STK8BA50 3-Axis Accelerometer Driver"
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depends on I2C
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help
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Say yes here to get support for the Sensortek STK8BA50 3-axis
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accelerometer.
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Choosing M will build the driver as a module. If so, the module
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will be called stk8ba50.
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endmenu
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@ -15,6 +15,7 @@ obj-$(CONFIG_MMA9551) += mma9551.o
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obj-$(CONFIG_MMA9553) += mma9553.o
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obj-$(CONFIG_STK8312) += stk8312.o
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obj-$(CONFIG_STK8BA50) += stk8ba50.o
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obj-$(CONFIG_IIO_SSP_SENSORS_COMMONS) += ssp_accel_sensor.o
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@ -0,0 +1,302 @@
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/**
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* Sensortek STK8BA50 3-Axis Accelerometer
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*
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* Copyright (c) 2015, Intel Corporation.
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*
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* STK8BA50 7-bit I2C address: 0x18.
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*/
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#include <linux/acpi.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#define STK8BA50_REG_XOUT 0x02
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#define STK8BA50_REG_YOUT 0x04
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#define STK8BA50_REG_ZOUT 0x06
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#define STK8BA50_REG_RANGE 0x0F
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#define STK8BA50_REG_POWMODE 0x11
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#define STK8BA50_REG_SWRST 0x14
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#define STK8BA50_MODE_NORMAL 0
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#define STK8BA50_MODE_SUSPEND 1
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#define STK8BA50_MODE_POWERBIT BIT(7)
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#define STK8BA50_DATA_SHIFT 6
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#define STK8BA50_RESET_CMD 0xB6
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#define STK8BA50_DRIVER_NAME "stk8ba50"
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#define STK8BA50_SCALE_AVAIL "0.0384 0.0767 0.1534 0.3069"
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/*
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* The accelerometer has four measurement ranges:
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* +/-2g; +/-4g; +/-8g; +/-16g
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*
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* Acceleration values are 10-bit, 2's complement.
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* Scales are calculated as following:
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*
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* scale1 = (2 + 2) * 9.81 / (2^10 - 1) = 0.0384
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* scale2 = (4 + 4) * 9.81 / (2^10 - 1) = 0.0767
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* etc.
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*
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* Scales are stored in this format:
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* { <register value>, <scale value> }
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*
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* Locally, the range is stored as a table index.
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*/
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static const int stk8ba50_scale_table[][2] = {
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{3, 38400}, {5, 76700}, {8, 153400}, {12, 306900}
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};
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struct stk8ba50_data {
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struct i2c_client *client;
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struct mutex lock;
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int range;
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};
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#define STK8BA50_ACCEL_CHANNEL(reg, axis) { \
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.type = IIO_ACCEL, \
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.address = reg, \
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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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}
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static const struct iio_chan_spec stk8ba50_channels[] = {
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STK8BA50_ACCEL_CHANNEL(STK8BA50_REG_XOUT, X),
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STK8BA50_ACCEL_CHANNEL(STK8BA50_REG_YOUT, Y),
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STK8BA50_ACCEL_CHANNEL(STK8BA50_REG_ZOUT, Z),
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};
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static IIO_CONST_ATTR(in_accel_scale_available, STK8BA50_SCALE_AVAIL);
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static struct attribute *stk8ba50_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 stk8ba50_attribute_group = {
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.attrs = stk8ba50_attributes
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};
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static int stk8ba50_read_accel(struct stk8ba50_data *data, u8 reg)
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{
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int ret;
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struct i2c_client *client = data->client;
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ret = i2c_smbus_read_word_data(client, reg);
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if (ret < 0) {
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dev_err(&client->dev, "register read failed\n");
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return ret;
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}
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return sign_extend32(ret >> STK8BA50_DATA_SHIFT, 9);
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}
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static int stk8ba50_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 stk8ba50_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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mutex_lock(&data->lock);
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*val = stk8ba50_read_accel(data, chan->address);
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mutex_unlock(&data->lock);
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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 = stk8ba50_scale_table[data->range][1];
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return IIO_VAL_INT_PLUS_MICRO;
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}
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return -EINVAL;
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}
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static int stk8ba50_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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int ret;
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int i;
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int index = -1;
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struct stk8ba50_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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for (i = 0; i < ARRAY_SIZE(stk8ba50_scale_table); i++)
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if (val2 == stk8ba50_scale_table[i][1]) {
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index = i;
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break;
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}
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if (index < 0)
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return -EINVAL;
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ret = i2c_smbus_write_byte_data(data->client,
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STK8BA50_REG_RANGE,
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stk8ba50_scale_table[index][0]);
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if (ret < 0)
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dev_err(&data->client->dev,
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"failed to set measurement range\n");
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else
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data->range = index;
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return ret;
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}
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return -EINVAL;
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}
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static const struct iio_info stk8ba50_info = {
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.driver_module = THIS_MODULE,
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.read_raw = stk8ba50_read_raw,
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.write_raw = stk8ba50_write_raw,
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.attrs = &stk8ba50_attribute_group,
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};
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static int stk8ba50_set_power(struct stk8ba50_data *data, bool mode)
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{
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int ret;
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u8 masked_reg;
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struct i2c_client *client = data->client;
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ret = i2c_smbus_read_byte_data(client, STK8BA50_REG_POWMODE);
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if (ret < 0)
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goto exit_err;
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if (mode)
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masked_reg = ret | STK8BA50_MODE_POWERBIT;
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else
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masked_reg = ret & (~STK8BA50_MODE_POWERBIT);
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ret = i2c_smbus_write_byte_data(client, STK8BA50_REG_POWMODE,
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masked_reg);
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if (ret < 0)
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goto exit_err;
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return ret;
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exit_err:
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dev_err(&client->dev, "failed to change sensor mode\n");
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return ret;
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}
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static int stk8ba50_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int ret;
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struct iio_dev *indio_dev;
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struct stk8ba50_data *data;
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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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dev_err(&client->dev, "iio allocation failed!\n");
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return -ENOMEM;
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}
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data = iio_priv(indio_dev);
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data->client = client;
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i2c_set_clientdata(client, indio_dev);
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mutex_init(&data->lock);
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indio_dev->dev.parent = &client->dev;
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indio_dev->info = &stk8ba50_info;
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indio_dev->name = STK8BA50_DRIVER_NAME;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = stk8ba50_channels;
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indio_dev->num_channels = ARRAY_SIZE(stk8ba50_channels);
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/* Reset all registers on startup */
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ret = i2c_smbus_write_byte_data(client,
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STK8BA50_REG_SWRST, STK8BA50_RESET_CMD);
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if (ret < 0) {
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dev_err(&client->dev, "failed to reset sensor\n");
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return ret;
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}
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/* The default range is +/-2g */
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data->range = 0;
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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, "device_register failed\n");
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stk8ba50_set_power(data, STK8BA50_MODE_SUSPEND);
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}
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return ret;
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}
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static int stk8ba50_remove(struct i2c_client *client)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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iio_device_unregister(indio_dev);
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return stk8ba50_set_power(iio_priv(indio_dev), STK8BA50_MODE_SUSPEND);
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}
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#ifdef CONFIG_PM_SLEEP
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static int stk8ba50_suspend(struct device *dev)
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{
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struct stk8ba50_data *data;
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data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
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return stk8ba50_set_power(data, STK8BA50_MODE_SUSPEND);
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}
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static int stk8ba50_resume(struct device *dev)
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{
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struct stk8ba50_data *data;
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data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
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return stk8ba50_set_power(data, STK8BA50_MODE_NORMAL);
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}
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static SIMPLE_DEV_PM_OPS(stk8ba50_pm_ops, stk8ba50_suspend, stk8ba50_resume);
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#define STK8BA50_PM_OPS (&stk8ba50_pm_ops)
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#else
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#define STK8BA50_PM_OPS NULL
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#endif
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static const struct i2c_device_id stk8ba50_i2c_id[] = {
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{"stk8ba50", 0},
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{}
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};
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static const struct acpi_device_id stk8ba50_acpi_id[] = {
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{"STK8BA50", 0},
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{}
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};
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MODULE_DEVICE_TABLE(acpi, stk8ba50_acpi_id);
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static struct i2c_driver stk8ba50_driver = {
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.driver = {
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.name = "stk8ba50",
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.pm = STK8BA50_PM_OPS,
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.acpi_match_table = ACPI_PTR(stk8ba50_acpi_id),
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},
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.probe = stk8ba50_probe,
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.remove = stk8ba50_remove,
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.id_table = stk8ba50_i2c_id,
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};
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module_i2c_driver(stk8ba50_driver);
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MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
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MODULE_DESCRIPTION("STK8BA50 3-Axis Accelerometer driver");
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MODULE_LICENSE("GPL v2");
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