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Commit 194dc4c7 authored by Tiberiu Breana's avatar Tiberiu Breana Committed by Jonathan Cameron
Browse files

iio: accel: Add triggered buffer support for BMA220 



Signed-off-by: default avatarTiberiu Breana <tiberiu.a.breana@intel.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent ba35f111

drivers/iio/accel/bma220_spi.c

+63 −2
Original line number Diff line number Diff line
@@ -11,9 +11,12 @@ 
#include <linux/acpi.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/iio/buffer.h>

#include <linux/iio/iio.h>

#include <linux/iio/sysfs.h>

#include <linux/spi/spi.h>

#include <linux/iio/trigger_consumer.h>

#include <linux/iio/triggered_buffer.h>



#define BMA220_REG_ID				0x00

#define BMA220_REG_ACCEL_X			0x02
@@ -39,8 +42,22 @@ 
	.channel2 = IIO_MOD_##axis,					\

	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),			\

	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),		\

	.scan_index = index,						\

	.scan_type = {							\

		.sign = 's',						\

		.realbits = 6,						\

		.storagebits = 8,					\

		.shift = BMA220_DATA_SHIFT,				\

		.endianness = IIO_CPU,					\

	},								\

}



enum bma220_axis {

	AXIS_X,

	AXIS_Y,

	AXIS_Z,

};



static IIO_CONST_ATTR(in_accel_scale_available, BMA220_SCALE_AVAILABLE);



static struct attribute *bma220_attributes[] = {
@@ -59,6 +76,7 @@ static const int bma220_scale_table[][4] = { 
struct bma220_data {

	struct spi_device *spi_device;

	struct mutex lock;

	s8 buffer[16]; /* 3x8-bit channels + 5x8 padding + 8x8 timestamp */

	u8 tx_buf[2] ____cacheline_aligned;

};
@@ -66,6 +84,7 @@ 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),

	IIO_CHAN_SOFT_TIMESTAMP(3),

};



static inline int bma220_read_reg(struct spi_device *spi, u8 reg)
@@ -73,6 +92,35 @@ static inline int bma220_read_reg(struct spi_device *spi, u8 reg) 
	return spi_w8r8(spi, reg | BMA220_READ_MASK);

}



static const unsigned long bma220_accel_scan_masks[] = {

	BIT(AXIS_X) | BIT(AXIS_Y) | BIT(AXIS_Z),

	0

};



static irqreturn_t bma220_trigger_handler(int irq, void *p)

{

	int ret;

	struct iio_poll_func *pf = p;

	struct iio_dev *indio_dev = pf->indio_dev;

	struct bma220_data *data = iio_priv(indio_dev);

	struct spi_device *spi = data->spi_device;



	mutex_lock(&data->lock);

	data->tx_buf[0] = BMA220_REG_ACCEL_X | BMA220_READ_MASK;

	ret = spi_write_then_read(spi, data->tx_buf, 1, data->buffer,

				  ARRAY_SIZE(bma220_channels) - 1);

	if (ret < 0)

		goto err;



	iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,

					   pf->timestamp);

err:

	mutex_unlock(&data->lock);

	iio_trigger_notify_done(indio_dev->trig);



	return IRQ_HANDLED;

}



static int bma220_read_raw(struct iio_dev *indio_dev,

			   struct iio_chan_spec const *chan,

			   int *val, int *val2, long mask)
@@ -199,18 +247,30 @@ static int bma220_probe(struct spi_device *spi) 
	indio_dev->modes = INDIO_DIRECT_MODE;

	indio_dev->channels = bma220_channels;

	indio_dev->num_channels = ARRAY_SIZE(bma220_channels);

	indio_dev->available_scan_masks = bma220_accel_scan_masks;



	ret = bma220_init(data->spi_device);

	if (ret < 0)

		return ret;



	ret = iio_triggered_buffer_setup(indio_dev, NULL,

					 bma220_trigger_handler, NULL);

	if (ret < 0) {

		dev_err(&spi->dev, "iio triggered buffer setup failed\n");

		goto err_suspend;

	}



	ret = iio_device_register(indio_dev);

	if (ret < 0) {

		dev_err(&spi->dev, "iio_device_register failed\n");

		return bma220_deinit(spi);

		iio_triggered_buffer_cleanup(indio_dev);

		goto err_suspend;

	}



	return ret;

	return 0;



err_suspend:

	return bma220_deinit(spi);

}



static int bma220_remove(struct spi_device *spi)
@@ -218,6 +278,7 @@ static int bma220_remove(struct spi_device *spi) 
	struct iio_dev *indio_dev = spi_get_drvdata(spi);



	iio_device_unregister(indio_dev);

	iio_triggered_buffer_cleanup(indio_dev);



	return bma220_deinit(spi);

}