linux-kernel - [PATCH 2/2] iio: imu: adis16480: Add the option to enable/disable burst mode

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Date:   Tue, 4 Aug 2020 13:04:14 +0300
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <jic23@...nel.org>, Stefan Popa <stefan.popa@...log.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH 2/2] iio: imu: adis16480: Add the option to enable/disable burst mode

From: Stefan Popa <stefan.popa@...log.com>

Although the burst read function does not require a stall time between
each 16-bit segment, it however requires more processing since the
software needs to look for the BURST_ID and take into account the offset
to the first data channel. Some users might find it useful to be able to
switch between the two modes.

Signed-off-by: Stefan Popa <stefan.popa@...log.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
 drivers/iio/imu/adis16480.c | 48 +++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/drivers/iio/imu/adis16480.c b/drivers/iio/imu/adis16480.c
index 9b100c8fb744..7d7712c33435 100644
--- a/drivers/iio/imu/adis16480.c
+++ b/drivers/iio/imu/adis16480.c
@@ -330,6 +330,45 @@ static int adis16480_debugfs_init(struct iio_dev *indio_dev)
 
 #endif
 
+static ssize_t adis16495_burst_mode_enable_get(struct device *dev,
+					       struct device_attribute *attr,
+					       char *buf)
+{
+	struct adis16480 *st = iio_priv(dev_to_iio_dev(dev));
+
+	return sprintf(buf, "%d\n", st->adis.burst->en);
+}
+
+static ssize_t adis16495_burst_mode_enable_set(struct device *dev,
+					       struct device_attribute *attr,
+					       const char *buf, size_t len)
+{
+	struct adis16480 *st = iio_priv(dev_to_iio_dev(dev));
+	bool val;
+	int ret;
+
+	ret = kstrtobool(buf, &val);
+	if (ret)
+		return ret;
+
+	st->adis.burst->en = val;
+
+	return len;
+}
+
+static IIO_DEVICE_ATTR(burst_mode_enable, 0644,
+		       adis16495_burst_mode_enable_get,
+		       adis16495_burst_mode_enable_set, 0);
+
+static struct attribute *adis16495_attributes[] = {
+	&iio_dev_attr_burst_mode_enable.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group adis16495_attribute_group = {
+	.attrs = adis16495_attributes,
+};
+
 static int adis16480_set_freq(struct iio_dev *indio_dev, int val, int val2)
 {
 	struct adis16480 *st = iio_priv(indio_dev);
@@ -1131,6 +1170,14 @@ static const struct iio_info adis16480_info = {
 	.debugfs_reg_access = adis_debugfs_reg_access,
 };
 
+static const struct iio_info adis16495_info = {
+	.attrs = &adis16495_attribute_group,
+	.read_raw = &adis16480_read_raw,
+	.write_raw = &adis16480_write_raw,
+	.update_scan_mode = adis_update_scan_mode,
+	.debugfs_reg_access = adis_debugfs_reg_access,
+};
+
 static int adis16480_stop_device(struct iio_dev *indio_dev)
 {
 	struct adis16480 *st = iio_priv(indio_dev);
@@ -1365,6 +1412,7 @@ static int adis16480_probe(struct spi_device *spi)
 	if (st->chip_info->burst) {
 		st->adis.burst = st->chip_info->burst;
 		st->adis.burst_extra_len = st->chip_info->burst->extra_len;
+		indio_dev->info = &adis16495_info;
 	}
 
 	ret = adis_setup_buffer_and_trigger(&st->adis, indio_dev,
-- 
2.17.1