iio: mxc4005: add triggered buffer mode for mxc4005 (1ce0eda0) · Commits · 戴 / test

drivers/iio/accel/Kconfig

+2 −0

Original line number	Diff line number	Diff line
		@@ -140,6 +140,8 @@ config MMA9553
		config MXC4005
		tristate "Memsic MXC4005XC 3-Axis Accelerometer Driver"
		depends on I2C
		select IIO_BUFFER
		select IIO_TRIGGERED_BUFFER
		select REGMAP_I2C
		help
		Say yes here to build support for the Memsic MXC4005XC 3-axis

drivers/iio/accel/mxc4005.c

+76 −3

Original line number	Diff line number	Diff line
		@@ -19,6 +19,9 @@
		#include <linux/acpi.h>
		#include <linux/regmap.h>
		#include <linux/iio/sysfs.h>
		#include <linux/iio/buffer.h>
		#include <linux/iio/triggered_buffer.h>
		#include <linux/iio/trigger_consumer.h>

		#define MXC4005_DRV_NAME "mxc4005"
		#define MXC4005_REGMAP_NAME "mxc4005_regmap"
		@@ -52,6 +55,7 @@ struct mxc4005_data {
		struct device *dev;
		struct mutex mutex;
		struct regmap *regmap;
		__be16 buffer[8];
		};

		/*
		@@ -122,6 +126,20 @@ static const struct regmap_config mxc4005_regmap_config = {
		.writeable_reg = mxc4005_is_writeable_reg,
		};

		static int mxc4005_read_xyz(struct mxc4005_data *data)
		{
		int ret;

		ret = regmap_bulk_read(data->regmap, MXC4005_REG_XOUT_UPPER,
		(u8 *) data->buffer, sizeof(data->buffer));
		if (ret < 0) {
		dev_err(data->dev, "failed to read axes\n");
		return ret;
		}

		return 0;
		}

		static int mxc4005_read_axis(struct mxc4005_data *data,
		unsigned int addr)
		{
		@@ -197,7 +215,8 @@ static int mxc4005_read_raw(struct iio_dev *indio_dev,
		ret = mxc4005_read_axis(data, chan->address);
		if (ret < 0)
		return ret;
		*val = sign_extend32(ret >> 4, 11);
		*val = sign_extend32(ret >> chan->scan_type.shift,
		chan->scan_type.realbits - 1);
		return IIO_VAL_INT;
		default:
		return -EINVAL;
		@@ -239,6 +258,11 @@ static const struct iio_info mxc4005_info = {
		.attrs = &mxc4005_attrs_group,
		};

		static const unsigned long mxc4005_scan_masks[] = {
		BIT(AXIS_X) \| BIT(AXIS_Y) \| BIT(AXIS_Z),
		0
		};

		#define MXC4005_CHANNEL(_axis, _addr) { \
		.type = IIO_ACCEL, \
		.modified = 1, \
		@@ -246,14 +270,43 @@ static const struct iio_info mxc4005_info = {
		.address = _addr, \
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
		.scan_index = AXIS_##_axis, \
		.scan_type = { \
		.sign = 's', \
		.realbits = 12, \
		.storagebits = 16, \
		.shift = 4, \
		.endianness = IIO_BE, \
		}, \
		}

		static const struct iio_chan_spec mxc4005_channels[] = {
		MXC4005_CHANNEL(X, MXC4005_REG_XOUT_UPPER),
		MXC4005_CHANNEL(Y, MXC4005_REG_YOUT_UPPER),
		MXC4005_CHANNEL(Z, MXC4005_REG_ZOUT_UPPER),
		IIO_CHAN_SOFT_TIMESTAMP(3),
		};

		static irqreturn_t mxc4005_trigger_handler(int irq, void *private)
		{
		struct iio_poll_func *pf = private;
		struct iio_dev *indio_dev = pf->indio_dev;
		struct mxc4005_data *data = iio_priv(indio_dev);
		int ret;

		ret = mxc4005_read_xyz(data);
		if (ret < 0)
		goto err;

		iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
		pf->timestamp);

		err:
		iio_trigger_notify_done(indio_dev->trig);

		return IRQ_HANDLED;
		}

		static int mxc4005_chip_init(struct mxc4005_data *data)
		{
		int ret;
		@@ -304,23 +357,43 @@ static int mxc4005_probe(struct i2c_client *client,
		indio_dev->dev.parent = &client->dev;
		indio_dev->channels = mxc4005_channels;
		indio_dev->num_channels = ARRAY_SIZE(mxc4005_channels);
		indio_dev->available_scan_masks = mxc4005_scan_masks;
		indio_dev->name = MXC4005_DRV_NAME;
		indio_dev->modes = INDIO_DIRECT_MODE;
		indio_dev->info = &mxc4005_info;

		ret = iio_triggered_buffer_setup(indio_dev,
		&iio_pollfunc_store_time,
		mxc4005_trigger_handler,
		NULL);
		if (ret < 0) {
		dev_err(&client->dev,
		"failed to setup iio triggered buffer\n");
		return ret;
		}

		ret = iio_device_register(indio_dev);
		if (ret < 0) {
		dev_err(&client->dev,
		"unable to register iio device %d\n", ret);
		return ret;
		goto err_buffer_cleanup;
		}

		return 0;

		err_buffer_cleanup:
		iio_triggered_buffer_cleanup(indio_dev);

		return ret;
		}

		static int mxc4005_remove(struct i2c_client *client)
		{
		iio_device_unregister(i2c_get_clientdata(client));
		struct iio_dev *indio_dev = i2c_get_clientdata(client);

		iio_device_unregister(indio_dev);

		iio_triggered_buffer_cleanup(indio_dev);

		return 0;
		}

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