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Commit a8319593 authored by Andreas Klinger's avatar Andreas Klinger Committed by Jonathan Cameron
Browse files

iio: srf08: add triggered buffer support 



Add support for triggered buffers.

Data format is quite simple:
  distance     16 Bit
  alignment    48 Bit
  timestamp    64 Bit

Signed-off-by: default avatarAndreas Klinger <ak@it-klinger.de>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent c02b3a11

drivers/iio/proximity/srf08.c

+57 −3
Original line number Diff line number Diff line
@@ -18,6 +18,9 @@ 
#include <linux/bitops.h>

#include <linux/iio/iio.h>

#include <linux/iio/sysfs.h>

#include <linux/iio/buffer.h>

#include <linux/iio/trigger_consumer.h>

#include <linux/iio/triggered_buffer.h>



/* registers of SRF08 device */

#define SRF08_WRITE_COMMAND	0x00	/* Command Register */
@@ -35,9 +38,22 @@ 


struct srf08_data {

	struct i2c_client	*client;

	int			sensitivity;		/* Gain */

	int			range_mm;		/* max. Range in mm */



	/*

	 * Gain in the datasheet is called sensitivity here to distinct it

	 * from the gain used with amplifiers of adc's

	 */

	int			sensitivity;



	/* max. Range in mm */

	int			range_mm;

	struct mutex		lock;



	/*

	 * triggered buffer

	 * 1x16-bit channel + 3x16 padding + 4x16 timestamp

	 */

	s16			buffer[8];

};



/*
@@ -110,6 +126,29 @@ static int srf08_read_ranging(struct srf08_data *data) 
	return ret;

}



static irqreturn_t srf08_trigger_handler(int irq, void *p)

{

	struct iio_poll_func *pf = p;

	struct iio_dev *indio_dev = pf->indio_dev;

	struct srf08_data *data = iio_priv(indio_dev);

	s16 sensor_data;



	sensor_data = srf08_read_ranging(data);

	if (sensor_data < 0)

		goto err;



	mutex_lock(&data->lock);



	data->buffer[0] = sensor_data;

	iio_push_to_buffers_with_timestamp(indio_dev,

						data->buffer, pf->timestamp);



	mutex_unlock(&data->lock);

err:

	iio_trigger_notify_done(indio_dev->trig);

	return IRQ_HANDLED;

}



static int srf08_read_raw(struct iio_dev *indio_dev,

			    struct iio_chan_spec const *channel, int *val,

			    int *val2, long mask)
@@ -323,7 +362,15 @@ static const struct iio_chan_spec srf08_channels[] = { 
		.info_mask_separate =

				BIT(IIO_CHAN_INFO_RAW) |

				BIT(IIO_CHAN_INFO_SCALE),

		.scan_index = 0,

		.scan_type = {

			.sign = 's',

			.realbits = 16,

			.storagebits = 16,

			.endianness = IIO_CPU,

		},

	},

	IIO_CHAN_SOFT_TIMESTAMP(1),

};



static const struct iio_info srf08_info = {
@@ -362,6 +409,13 @@ static int srf08_probe(struct i2c_client *client, 


	mutex_init(&data->lock);



	ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev,

			iio_pollfunc_store_time, srf08_trigger_handler, NULL);

	if (ret < 0) {

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

		return ret;

	}



	/*

	 * set default values of device here

	 * these register values cannot be read from the hardware
@@ -402,5 +456,5 @@ static struct i2c_driver srf08_driver = { 
module_i2c_driver(srf08_driver);



MODULE_AUTHOR("Andreas Klinger <ak@it-klinger.de>");

MODULE_DESCRIPTION("Devantech SRF08 ultrasonic ranger driver");

MODULE_DESCRIPTION("Devantech SRF08/SRF10 ultrasonic ranger driver");

MODULE_LICENSE("GPL");