Am 2016-04-29 um 15:05 schrieb Tiberiu Breana:
> This commit adds basic support for the Bosch Sensortec BMA220
> digital triaxial acceleration sensor.
If there's a datasheet publically available from Bosch, please link it here.
>
> Includes:
> - raw readings
> - ACPI detection
> - power management
>
> Signed-off-by: Tiberiu Breana <tiberiu.a.breana@xxxxxxxxx>
> ---
> drivers/iio/accel/Kconfig | 10 ++
> drivers/iio/accel/Makefile | 1 +
> drivers/iio/accel/bma220_spi.c | 257 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 268 insertions(+)
> create mode 100644 drivers/iio/accel/bma220_spi.c
>
> diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> index e4a758c..98740c7 100644
> --- a/drivers/iio/accel/Kconfig
> +++ b/drivers/iio/accel/Kconfig
> @@ -17,6 +17,16 @@ config BMA180
> To compile this driver as a module, choose M here: the
> module will be called bma180.
>
> +config BMA220
> + tristate "Bosch BMA220 3-Axis Accelerometer Driver"
> + depends on SPI
> + help
> + Say yes here to add support for the Bosch BMA220 triaxial
> + acceleration sensor.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called bma220_spi.
> +
> config BMC150_ACCEL
> tristate "Bosch BMC150 Accelerometer Driver"
> select IIO_BUFFER
> diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
> index 71b6794..9ae7820e 100644
> --- a/drivers/iio/accel/Makefile
> +++ b/drivers/iio/accel/Makefile
> @@ -4,6 +4,7 @@
>
> # When adding new entries keep the list in alphabetical order
> obj-$(CONFIG_BMA180) += bma180.o
> +obj-$(CONFIG_BMA220) += bma220_spi.o
> obj-$(CONFIG_BMC150_ACCEL) += bmc150-accel-core.o
> obj-$(CONFIG_BMC150_ACCEL_I2C) += bmc150-accel-i2c.o
> obj-$(CONFIG_BMC150_ACCEL_SPI) += bmc150-accel-spi.o
> diff --git a/drivers/iio/accel/bma220_spi.c b/drivers/iio/accel/bma220_spi.c
> new file mode 100644
> index 0000000..5df5594
> --- /dev/null
> +++ b/drivers/iio/accel/bma220_spi.c
> @@ -0,0 +1,257 @@
> +/**
> + * BMA220 Digital triaxial acceleration sensor driver
> + *
> + * Copyright (c) 2016, Intel Corporation.
> + *
> + * This file is subject to the terms and conditions of version 2 of
> + * the GNU General Public License. See the file COPYING in the main
> + * directory of this archive for more details.
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +#include <linux/spi/spi.h>
> +
> +#define BMA220_REG_ID 0x00
> +#define BMA220_REG_ACCEL_X 0x02
> +#define BMA220_REG_ACCEL_Y 0x03
> +#define BMA220_REG_ACCEL_Z 0x04
> +#define BMA220_REG_RANGE 0x11
> +#define BMA220_REG_SUSPEND 0x18
> +
> +#define BMA220_CHIP_ID 0xDD
> +#define BMA220_READ_MASK 0x80
> +#define BMA220_RANGE_MASK 0x03
> +#define BMA220_DATA_SHIFT 2
> +#define BMA220_SUSPEND_SLEEP 0xFF
> +#define BMA220_SUSPEND_WAKE 0x00
> +
> +#define BMA220_DEVICE_NAME "bma220"
> +#define BMA220_SCALE_AVAILABLE "0.623 1.248 2.491 4.983"
> +
> +#define BMA220_ACCEL_CHANNEL(index, reg, axis) { \
> + .type = IIO_ACCEL, \
> + .address = reg, \
> + .modified = 1, \
> + .channel2 = IIO_MOD_##axis, \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
> +}
> +
> +static IIO_CONST_ATTR(in_accel_scale_available, BMA220_SCALE_AVAILABLE);
> +
> +static struct attribute *bma220_attributes[] = {
> + &iio_const_attr_in_accel_scale_available.dev_attr.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group bma220_attribute_group = {
> + .attrs = bma220_attributes,
> +};
> +
> +static const int bma220_scale_table[][4] = {
> + {0, 623000}, {1, 248000}, {2, 491000}, {4, 983000}
> +};
> +
> +struct bma220_data {
> + struct spi_device *spi_device;
> +};
> +
> +static const struct iio_chan_spec bma220_channels[] = {
> + BMA220_ACCEL_CHANNEL(0, BMA220_REG_ACCEL_X, X),
> + BMA220_ACCEL_CHANNEL(1, BMA220_REG_ACCEL_Y, Y),
> + BMA220_ACCEL_CHANNEL(2, BMA220_REG_ACCEL_Z, Z),
> +};
> +
> +static inline int bma220_read_reg(struct spi_device *spi, u8 reg)
> +{
> + return spi_w8r8(spi, reg | BMA220_READ_MASK);
> +}
> +
> +static int bma220_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2, long mask)
> +{
> + int ret;
> + u8 range_idx;
> + struct bma220_data *data = iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + ret = bma220_read_reg(data->spi_device, chan->address);
> + if (ret < 0)
> + return -EINVAL;
> + *val = sign_extend32(ret >> BMA220_DATA_SHIFT, 5);
> + return IIO_VAL_INT;
> + case IIO_CHAN_INFO_SCALE:
> + ret = bma220_read_reg(data->spi_device, BMA220_REG_RANGE);
> + if (ret < 0)
> + return ret;
> + range_idx = ret & BMA220_RANGE_MASK;
> + *val = bma220_scale_table[range_idx][0];
> + *val2 = bma220_scale_table[range_idx][1];
> + return IIO_VAL_INT_PLUS_MICRO;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int bma220_write_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int val, int val2, long mask)
> +{
> + int i;
> + int ret;
> + u8 buf[2];
> + int index = -1;
> + struct bma220_data *data = iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_SCALE:
> + for (i = 0; i < ARRAY_SIZE(bma220_scale_table); i++)
> + if (val == bma220_scale_table[i][0] &&
> + val2 == bma220_scale_table[i][1]) {
> + index = i;
> + break;
> + }
> + if (index < 0)
> + return -EINVAL;
> +
> + buf[0] = BMA220_REG_RANGE;
> + buf[1] = index;
> + ret = spi_write(data->spi_device, &buf, sizeof(buf));
> + if (ret < 0)
> + dev_err(&data->spi_device->dev,
> + "failed to set measurement range\n");
> +
> + return 0;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static const struct iio_info bma220_info = {
> + .driver_module = THIS_MODULE,
> + .read_raw = bma220_read_raw,
> + .write_raw = bma220_write_raw,
> + .attrs = &bma220_attribute_group,
> +};
> +
> +static int bma220_init(struct spi_device *spi)
> +{
> + int ret;
> +
> + ret = bma220_read_reg(spi, BMA220_REG_ID);
> + if (ret != BMA220_CHIP_ID)
> + return -ENODEV;
> +
> + /* Make sure the chip is powered on */
> + ret = bma220_read_reg(spi, BMA220_REG_SUSPEND);
> + if (ret < 0)
> + return ret;
> + else if (ret == BMA220_SUSPEND_WAKE)
> + return bma220_read_reg(spi, BMA220_REG_SUSPEND);
> +
> + return 0;
> +}
> +
> +static int bma220_probe(struct spi_device *spi)
> +{
> + int ret;
> + struct iio_dev *indio_dev;
> + struct bma220_data *data;
> +
> + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data));
> + if (!indio_dev) {
> + dev_err(&spi->dev, "iio allocation failed!\n");
> + return -ENOMEM;
> + }
> +
> + data = iio_priv(indio_dev);
> + data->spi_device = spi;
> + spi_set_drvdata(spi, indio_dev);
> +
> + indio_dev->dev.parent = &spi->dev;
> + indio_dev->info = &bma220_info;
> + indio_dev->name = BMA220_DEVICE_NAME;
> + indio_dev->modes = INDIO_DIRECT_MODE;
> + indio_dev->channels = bma220_channels;
> + indio_dev->num_channels = ARRAY_SIZE(bma220_channels);
> +
> + ret = bma220_init(data->spi_device);
> + if (ret < 0)
> + return ret;
> +
> + ret = iio_device_register(indio_dev);
> + if (ret < 0)
> + dev_err(&spi->dev, "iio_device_register failed\n");
> +
> + return ret;
> +}
> +
> +static int bma220_remove(struct spi_device *spi)
> +{
> + struct iio_dev *indio_dev = spi_get_drvdata(spi);
> + struct bma220_data *data = iio_priv(indio_dev);
> +
> + iio_device_unregister(indio_dev);
> +
> + return bma220_read_reg(data->spi_device, BMA220_REG_SUSPEND);
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int bma220_suspend(struct device *dev)
> +{
> + struct bma220_data *data =
> + iio_priv(spi_get_drvdata(to_spi_device(dev)));
> +
> + /* The chip can be suspended/woken up by a simple register read. */
> + return bma220_read_reg(data->spi_device, BMA220_REG_SUSPEND);
> +}
> +
> +static int bma220_resume(struct device *dev)
> +{
> + struct bma220_data *data =
> + iio_priv(spi_get_drvdata(to_spi_device(dev)));
> +
> + return bma220_read_reg(data->spi_device, BMA220_REG_SUSPEND);
> +}
> +
> +static SIMPLE_DEV_PM_OPS(bma220_pm_ops, bma220_suspend, bma220_resume);
> +
> +#define BMA220_PM_OPS (&bma220_pm_ops)
> +#else
> +#define BMA220_PM_OPS NULL
> +#endif
> +
> +static const struct spi_device_id bma220_spi_id[] = {
> + {"bma220", 0},
> + {}
> +};
> +
> +static const struct acpi_device_id bma220_acpi_id[] = {
> + {"BMA0220", 0},
> + {}
> +};
> +
> +MODULE_DEVICE_TABLE(spi, bma220_spi_id);
> +
> +static struct spi_driver bma220_driver = {
> + .driver = {
> + .name = "bma220_spi",
> + .pm = BMA220_PM_OPS,
> + .acpi_match_table = ACPI_PTR(bma220_acpi_id),
> + },
> + .probe = bma220_probe,
> + .remove = bma220_remove,
> + .id_table = bma220_spi_id,
> +};
> +
> +module_spi_driver(bma220_driver);
> +
> +MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@xxxxxxxxx>");
> +MODULE_DESCRIPTION("BMA220 acceleration sensor driver");
> +MODULE_LICENSE("GPL v2");
>
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