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iio: imu: inv_icm42600: add buffer hwfifo watermark attributes

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Add hwfifo_watermark/min/max/enabled buffer attributes.
Hardware FIFO is always enabled and used.

Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Jean-Baptiste Maneyrol 2026-06-25 14:24:53 +02:00 committed by Jonathan Cameron
parent 53cea40388
commit 9f16490c4e
5 changed files with 45 additions and 4 deletions
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2
drivers/iio/imu/inv_icm42600/inv_icm42600.h
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@ -356,6 +356,8 @@ struct inv_icm42600_sensor_state {
cpu_to_le16((_wm) & GENMASK(11, 0))
/* FIFO is 2048 bytes, let 12 samples for reading latency */
#define INV_ICM42600_FIFO_WATERMARK_MAX (2048 - 12 * 16)
/* INV_ICM42600_FIFO_WATERMARK_MAX / 8 = 232 */
#define INV_ICM42600_FIFO_WATERMARK_MAX_SAMPLES 232
#define INV_ICM42600_REG_INT_CONFIG1 0x0064
#define INV_ICM42600_INT_CONFIG1_TPULSE_DURATION BIT(6)

5
drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c
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@ -1187,8 +1187,9 @@ struct iio_dev *inv_icm42600_accel_init(struct inv_icm42600_state *st)
indio_dev->num_channels = ARRAY_SIZE(inv_icm42600_accel_channels);
indio_dev->available_scan_masks = inv_icm42600_accel_scan_masks;
ret = devm_iio_kfifo_buffer_setup(dev, indio_dev,
&inv_icm42600_buffer_ops);
ret = devm_iio_kfifo_buffer_setup_ext(dev, indio_dev,
&inv_icm42600_buffer_ops,
inv_icm42600_buffer_attrs);
if (ret)
return ERR_PTR(ret);

36
drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c
View File

@ -10,9 +10,11 @@
#include <linux/mutex.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/stringify.h>
#include <linux/iio/buffer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/common/inv_sensors_timestamp.h>
@ -438,6 +440,40 @@ const struct iio_buffer_setup_ops inv_icm42600_buffer_ops = {
.postdisable = inv_icm42600_buffer_postdisable,
};
static ssize_t hwfifo_watermark_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct inv_icm42600_state *st = iio_device_get_drvdata(indio_dev);
unsigned int wm;
guard(mutex)(&st->lock);
if (indio_dev == st->indio_accel)
wm = st->fifo.watermark.eff_accel;
else if (indio_dev == st->indio_gyro)
wm = st->fifo.watermark.eff_gyro;
else
return -EINVAL;
return sysfs_emit(buf, "%u\n", wm);
}
IIO_STATIC_CONST_DEVICE_ATTR(hwfifo_watermark_min, "1");
IIO_STATIC_CONST_DEVICE_ATTR(hwfifo_watermark_max,
__stringify(INV_ICM42600_FIFO_WATERMARK_MAX_SAMPLES));
static IIO_DEVICE_ATTR_RO(hwfifo_watermark, 0);
IIO_STATIC_CONST_DEVICE_ATTR(hwfifo_enabled, "1");
const struct iio_dev_attr *inv_icm42600_buffer_attrs[] = {
&iio_dev_attr_hwfifo_watermark_min,
&iio_dev_attr_hwfifo_watermark_max,
&iio_dev_attr_hwfifo_watermark,
&iio_dev_attr_hwfifo_enabled,
NULL
};
int inv_icm42600_buffer_fifo_read(struct inv_icm42600_state *st,
unsigned int max)
{

1
drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.h
View File

@ -79,6 +79,7 @@ ssize_t inv_icm42600_fifo_decode_packet(const void *packet, const void **accel,
const void **timestamp, unsigned int *odr);
extern const struct iio_buffer_setup_ops inv_icm42600_buffer_ops;
extern const struct iio_dev_attr *inv_icm42600_buffer_attrs[];
int inv_icm42600_buffer_init(struct inv_icm42600_state *st);

5
drivers/iio/imu/inv_icm42600/inv_icm42600_gyro.c
View File

@ -773,8 +773,9 @@ struct iio_dev *inv_icm42600_gyro_init(struct inv_icm42600_state *st)
indio_dev->available_scan_masks = inv_icm42600_gyro_scan_masks;
indio_dev->setup_ops = &inv_icm42600_buffer_ops;
ret = devm_iio_kfifo_buffer_setup(dev, indio_dev,
&inv_icm42600_buffer_ops);
ret = devm_iio_kfifo_buffer_setup_ext(dev, indio_dev,
&inv_icm42600_buffer_ops,
inv_icm42600_buffer_attrs);
if (ret)
return ERR_PTR(ret);