[PATCH 3/7] iio: srf08: add triggered buffer support

[Andreas Klinger <ak@it-klinger.de>]

Add support for triggered buffers.

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

Signed-off-by: Andreas Klinger <ak@it-klinger.de>
---
 drivers/iio/proximity/srf08.c | 45 +++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 43 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/proximity/srf08.c b/drivers/iio/proximity/srf08.c
index 350b5b0eb64e..92e1799c430c 100644
--- a/drivers/iio/proximity/srf08.c
+++ b/drivers/iio/proximity/srf08.c
@@ -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 */
@@ -30,7 +33,6 @@
 
 #define SRF08_CMD_RANGING_CM	0x51	/* Ranging Mode - Result in cm */
 
-//#define SRF08_DEFAULT_GAIN	1025	/* default analogue value of Gain */
 #define SRF08_DEFAULT_RANGE	6020	/* default value of Range in mm */
 
 #define SRF08_MAX_SENSITIVITY	32	/* number of Gain Register values */
@@ -47,6 +49,8 @@ struct srf08_data {
 	int			range_mm;		/* max. Range in mm */
 	struct mutex		lock;
 	enum srf08_sensor_type	sensor_type;		/* Sensor-Type */
+	s16			buffer[8];
+			/* 1x16-bit channel + 3x16 padding + 4x16 timestamp */
 };
 
 /*
@@ -137,6 +141,28 @@ 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;
+	mutex_unlock(&data->lock);
+
+	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 srf08_read_raw(struct iio_dev *indio_dev,
 			    struct iio_chan_spec const *channel, int *val,
 			    int *val2, long mask)
@@ -357,7 +383,15 @@ 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 = {
@@ -397,6 +431,13 @@ 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
@@ -431,5 +472,5 @@ 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");
-- 
2.1.4


--