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Message-ID: <20250406133349.50633-1-brajeshpatil11@gmail.com>
Date: Sun, 6 Apr 2025 19:03:49 +0530
From: Brajesh Patil <brajeshpatil11@...il.com>
To: linux-iio@...r.kernel.org
Cc: jic23@...nel.org,
lars@...afoo.de,
linux-kernel@...r.kernel.org,
outreachy@...ts.linux.dev,
Brajesh Patil <brajeshpatil11@...il.com>
Subject: [PATCH v1 1/1] iio: dummy: Add 3-axis compass (magnetometer) channels to the iio_simple_dummy
This patch adds support for 3-axis magnetometer data (X, Y, Z) in the
iio_simple_dummy driver. It introduces three new IIO_MAGN channels and
populates them with dummy values for testing and prototyping purposes.
Signed-off-by: Brajesh Patil <brajeshpatil11@...il.com>
---
drivers/iio/dummy/iio_simple_dummy.c | 71 +++++++++++++++++++++++++++-
drivers/iio/dummy/iio_simple_dummy.h | 6 +++
2 files changed, 75 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/dummy/iio_simple_dummy.c b/drivers/iio/dummy/iio_simple_dummy.c
index 8575d4a08..713b764c9 100644
--- a/drivers/iio/dummy/iio_simple_dummy.c
+++ b/drivers/iio/dummy/iio_simple_dummy.c
@@ -222,7 +222,7 @@ static const struct iio_chan_spec iio_dummy_channels[] = {
* Convenience macro for timestamps. 4 is the index in
* the buffer.
*/
- IIO_CHAN_SOFT_TIMESTAMP(4),
+ IIO_CHAN_SOFT_TIMESTAMP(DUMMY_INDEX_SOFT_TIMESTAMP),
/* DAC channel out_voltage0_raw */
{
.type = IIO_VOLTAGE,
@@ -265,6 +265,48 @@ static const struct iio_chan_spec iio_dummy_channels[] = {
.num_event_specs = 1,
#endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
},
+ {
+ .type = IIO_MAGN,
+ .modified = 1,
+ .channel2 = IIO_MOD_X,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+ .scan_index = DUMMY_MAGN_X,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 16,
+ .storagebits = 16,
+ .shift = 0,
+ },
+ },
+ {
+ .type = IIO_MAGN,
+ .modified = 1,
+ .channel2 = IIO_MOD_Y,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+ .scan_index = DUMMY_MAGN_Y,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 16,
+ .storagebits = 16,
+ .shift = 0,
+ },
+ },
+ {
+ .type = IIO_MAGN,
+ .modified = 1,
+ .channel2 = IIO_MOD_Z,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+ .scan_index = DUMMY_MAGN_Z,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 16,
+ .storagebits = 16,
+ .shift = 0,
+ },
+ },
};
static int __iio_dummy_read_raw(struct iio_dev *indio_dev,
@@ -294,6 +336,22 @@ static int __iio_dummy_read_raw(struct iio_dev *indio_dev,
case IIO_ACCEL:
*val = st->accel_val;
return IIO_VAL_INT;
+ case IIO_MAGN:
+ switch (chan->scan_index) {
+ case DUMMY_MAGN_X:
+ *val = st->buffer_compass[0];
+ break;
+ case DUMMY_MAGN_Y:
+ *val = st->buffer_compass[1];
+ break;
+ case DUMMY_MAGN_Z:
+ *val = st->buffer_compass[2];
+ break;
+ default:
+ *val = 99;
+ break;
+ }
+ return IIO_VAL_INT;
default:
return -EINVAL;
}
@@ -378,6 +436,11 @@ static int iio_dummy_read_raw(struct iio_dev *indio_dev,
default:
return -EINVAL;
}
+ case IIO_MAGN:
+ // Just add some dummy values
+ *val = 0;
+ *val2 = 2;
+ return IIO_VAL_INT_PLUS_MICRO;
default:
return -EINVAL;
}
@@ -562,6 +625,10 @@ static int iio_dummy_init_device(struct iio_dev *indio_dev)
st->activity_running = 98;
st->activity_walking = 4;
+ st->buffer_compass[0] = 78;
+ st->buffer_compass[1] = 10;
+ st->buffer_compass[2] = 3;
+
return 0;
}
@@ -732,5 +799,5 @@ static struct iio_sw_device_type iio_dummy_device = {
module_iio_sw_device_driver(iio_dummy_device);
MODULE_AUTHOR("Jonathan Cameron <jic23@...nel.org>");
-MODULE_DESCRIPTION("IIO dummy driver");
+MODULE_DESCRIPTION("IIO dummy driver -> IIO dummy modified by Me");
MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/dummy/iio_simple_dummy.h b/drivers/iio/dummy/iio_simple_dummy.h
index 8246f25db..e05d8b5cc 100644
--- a/drivers/iio/dummy/iio_simple_dummy.h
+++ b/drivers/iio/dummy/iio_simple_dummy.h
@@ -12,6 +12,7 @@
struct iio_dummy_accel_calibscale;
struct iio_dummy_regs;
+#define DUMMY_AXIS_XYZ 3
/**
* struct iio_dummy_state - device instance specific state.
* @dac_val: cache for dac value
@@ -39,6 +40,7 @@ struct iio_dummy_state {
int steps_enabled;
int steps;
int height;
+ u16 buffer_compass[DUMMY_AXIS_XYZ];
#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
int event_irq;
int event_val;
@@ -107,6 +109,10 @@ enum iio_simple_dummy_scan_elements {
DUMMY_INDEX_DIFFVOLTAGE_1M2,
DUMMY_INDEX_DIFFVOLTAGE_3M4,
DUMMY_INDEX_ACCELX,
+ DUMMY_INDEX_SOFT_TIMESTAMP,
+ DUMMY_MAGN_X,
+ DUMMY_MAGN_Y,
+ DUMMY_MAGN_Z,
};
#ifdef CONFIG_IIO_SIMPLE_DUMMY_BUFFER
--
2.43.0
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