[PATCH v5 0/4] iio: Add support for rotation from north

[PATCH v5 0/4] iio: Add support for rotation from north

[Reyad Attiyat]

This series of patches modifies magn-3d driver to handle the rotation
from north usage. This is done by scanning the report and then building
the iio arrays (vals and channels) dynamically.

Changes from V4
I use the address field of struct iio_chan_spec to hold the array index
of the usage attribute. The scan_index field is generated when creating
an iio channel.

Reyad Attiyat (4):
  iio: Documentation: Add documentation for rotation from north sensor
    usage attributes
  iio: types: Added support for rotation from north usage attributes
  iio: hid-sensor-magn-3d: Scan for usage attributes before setting up
    iio channels
  iio: hid-sensor-magn-3d: Add support for rotation from north

 Documentation/ABI/testing/sysfs-bus-iio       |  82 +++++++++++
 drivers/iio/industrialio-core.c               |   4 +
 drivers/iio/magnetometer/hid-sensor-magn-3d.c | 199 ++++++++++++++++++++------
 include/linux/iio/types.h                     |   4 +
 4 files changed, 245 insertions(+), 44 deletions(-)

-- 
1.9.3

[PATCH v5 1/4] iio: Documentation: Add documentation for rotation from north sensor usage attributes

[Reyad Attiyat]

Added documentation for the sysfs attributes supported by the rotation from north
sensor.

Signed-off-by: Reyad Attiyat <reyad.attiyat@gmail.com>
---
 Documentation/ABI/testing/sysfs-bus-iio | 82 +++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index a9757dc..995642f 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -260,6 +260,10 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_magn_scale
 What:		/sys/bus/iio/devices/iio:deviceX/in_magn_x_scale
 What:		/sys/bus/iio/devices/iio:deviceX/in_magn_y_scale
 What:		/sys/bus/iio/devices/iio:deviceX/in_magn_z_scale
+What:		/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_magnetic_scale
+What:		/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_true_scale
+What:		/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_magnetic_tilt_comp_scale
+What:		/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_true_tilt_comp_scale
 What:		/sys/bus/iio/devices/iio:deviceX/in_pressureY_scale
 What:		/sys/bus/iio/devices/iio:deviceX/in_pressure_scale
 KernelVersion:	2.6.35
@@ -447,6 +451,14 @@ What:		/sys/.../iio:deviceX/events/in_magn_y_thresh_rising_en
 What:		/sys/.../iio:deviceX/events/in_magn_y_thresh_falling_en
 What:		/sys/.../iio:deviceX/events/in_magn_z_thresh_rising_en
 What:		/sys/.../iio:deviceX/events/in_magn_z_thresh_falling_en
+What:		/sys/.../iio:deviceX/events/in_rot_from_north_magnetic_thresh_rising_en
+What:		/sys/.../iio:deviceX/events/in_rot_from_north_magnetic_thresh_falling_en
+What:		/sys/.../iio:deviceX/events/in_rot_from_north_true_thresh_rising_en
+What:		/sys/.../iio:deviceX/events/in_rot_from_north_true_thresh_falling_en
+What:		/sys/.../iio:deviceX/events/in_rot_from_north_magnetic_tilt_comp_thresh_rising_en
+What:		/sys/.../iio:deviceX/events/in_rot_from_north_magnetic_tilt_comp_thresh_falling_en
+What:		/sys/.../iio:deviceX/events/in_rot_from_north_true_tilt_comp_thresh_rising_en
+What:		/sys/.../iio:deviceX/events/in_rot_from_north_true_tilt_comp_thresh_falling_en
 What:		/sys/.../iio:deviceX/events/in_voltageY_supply_thresh_rising_en
 What:		/sys/.../iio:deviceX/events/in_voltageY_supply_thresh_falling_en
 What:		/sys/.../iio:deviceX/events/in_voltageY_thresh_rising_en
@@ -492,6 +504,14 @@ What:		/sys/.../iio:deviceX/events/in_magn_y_roc_rising_en
 What:		/sys/.../iio:deviceX/events/in_magn_y_roc_falling_en
 What:		/sys/.../iio:deviceX/events/in_magn_z_roc_rising_en
 What:		/sys/.../iio:deviceX/events/in_magn_z_roc_falling_en
+What:		/sys/.../iio:deviceX/events/in_rot_from_north_magnetic_roc_rising_en
+What:		/sys/.../iio:deviceX/events/in_rot_from_north_magnetic_roc_falling_en
+What:		/sys/.../iio:deviceX/events/in_rot_from_north_true_roc_rising_en
+What:		/sys/.../iio:deviceX/events/in_rot_from_north_true_roc_falling_en
+What:		/sys/.../iio:deviceX/events/in_rot_from_north_magnetic_tilt_comp_roc_rising_en
+What:		/sys/.../iio:deviceX/events/in_rot_from_north_magnetic_tilt_comp_roc_falling_en
+What:		/sys/.../iio:deviceX/events/in_rot_from_north_true_tilt_comp_roc_rising_en
+What:		/sys/.../iio:deviceX/events/in_rot_from_north_true_tilt_comp_roc_falling_en
 What:		/sys/.../iio:deviceX/events/in_voltageY_supply_roc_rising_en
 What:		/sys/.../iio:deviceX/events/in_voltageY_supply_roc_falling_en
 What:		/sys/.../iio:deviceX/events/in_voltageY_roc_rising_en
@@ -538,6 +558,14 @@ What:		/sys/.../events/in_magn_y_raw_thresh_rising_value
 What:		/sys/.../events/in_magn_y_raw_thresh_falling_value
 What:		/sys/.../events/in_magn_z_raw_thresh_rising_value
 What:		/sys/.../events/in_magn_z_raw_thresh_falling_value
+What:		/sys/.../events/in_rot_from_north_magnetic_raw_thresh_rising_value
+What:		/sys/.../events/in_rot_from_north_magnetic_raw_thresh_falling_value
+What:		/sys/.../events/in_rot_from_north_true_raw_thresh_rising_value
+What:		/sys/.../events/in_rot_from_north_true_raw_thresh_falling_value
+What:		/sys/.../events/in_rot_from_north_magnetic_tilt_comp_raw_thresh_rising_value
+What:		/sys/.../events/in_rot_from_north_magnetic_tilt_comp_raw_thresh_falling_value
+What:		/sys/.../events/in_rot_from_north_true_tilt_comp_raw_thresh_rising_value
+What:		/sys/.../events/in_rot_from_north_true_tilt_comp_raw_thresh_falling_value
 What:		/sys/.../events/in_voltageY_supply_raw_thresh_rising_value
 What:		/sys/.../events/in_voltageY_supply_raw_thresh_falling_value
 What:		/sys/.../events/in_voltageY_raw_thresh_rising_value
@@ -588,6 +616,18 @@ What:		/sys/.../events/in_magn_y_thresh_either_hysteresis
 What:		/sys/.../events/in_magn_z_thresh_rising_hysteresis
 What:		/sys/.../events/in_magn_z_thresh_falling_hysteresis
 What:		/sys/.../events/in_magn_z_thresh_either_hysteresis
+What:		/sys/.../events/in_rot_from_north_magnetic_thresh_rising_hysteresis
+What:		/sys/.../events/in_rot_from_north_magnetic_thresh_falling_hysteresis
+What:		/sys/.../events/in_rot_from_north_magnetic_thresh_either_hysteresis
+What:		/sys/.../events/in_rot_from_north_true_thresh_rising_hysteresis
+What:		/sys/.../events/in_rot_from_north_true_thresh_falling_hysteresis
+What:		/sys/.../events/in_rot_from_north_true_thresh_either_hysteresis
+What:		/sys/.../events/in_rot_from_north_magnetic_tilt_comp_thresh_rising_hysteresis
+What:		/sys/.../events/in_rot_from_north_magnetic_tilt_comp_thresh_falling_hysteresis
+What:		/sys/.../events/in_rot_from_north_magnetic_tilt_comp_thresh_either_hysteresis
+What:		/sys/.../events/in_rot_from_north_true_tilt_comp_thresh_rising_hysteresis
+What:		/sys/.../events/in_rot_from_north_true_tilt_comp_thresh_falling_hysteresis
+What:		/sys/.../events/in_rot_from_north_true_tilt_comp_thresh_either_hysteresis
 What:		/sys/.../events/in_voltageY_thresh_rising_hysteresis
 What:		/sys/.../events/in_voltageY_thresh_falling_hysteresis
 What:		/sys/.../events/in_voltageY_thresh_either_hysteresis
@@ -635,6 +675,14 @@ What:		/sys/.../events/in_magn_y_raw_roc_rising_value
 What:		/sys/.../events/in_magn_y_raw_roc_falling_value
 What:		/sys/.../events/in_magn_z_raw_roc_rising_value
 What:		/sys/.../events/in_magn_z_raw_roc_falling_value
+What:		/sys/.../events/in_rot_from_north_magnetic_raw_roc_rising_value
+What:		/sys/.../events/in_rot_from_north_magnetic_raw_roc_falling_value
+What:		/sys/.../events/in_rot_from_north_true_raw_roc_rising_value
+What:		/sys/.../events/in_rot_from_north_true_raw_roc_falling_value
+What:		/sys/.../events/in_rot_from_north_magnetic_tilt_comp_raw_roc_rising_value
+What:		/sys/.../events/in_rot_from_north_magnetic_tilt_comp_raw_roc_falling_value
+What:		/sys/.../events/in_rot_from_north_true_tilt_comp_raw_roc_rising_value
+What:		/sys/.../events/in_rot_from_north_true_tilt_comp_raw_roc_falling_value
 What:		/sys/.../events/in_voltageY_supply_raw_roc_rising_value
 What:		/sys/.../events/in_voltageY_supply_raw_roc_falling_value
 What:		/sys/.../events/in_voltageY_raw_roc_rising_value
@@ -690,6 +738,22 @@ What:		/sys/.../events/in_magn_z_thresh_rising_period
 What:		/sys/.../events/in_magn_z_thresh_falling_period
 What:		/sys/.../events/in_magn_z_roc_rising_period
 What:		/sys/.../events/in_magn_z_roc_falling_period
+What:		/sys/.../events/in_rot_from_north_magnetic_thresh_rising_period
+What:		/sys/.../events/in_rot_from_north_magnetic_thresh_falling_period
+What:		/sys/.../events/in_rot_from_north_magnetic_roc_rising_period
+What:		/sys/.../events/in_rot_from_north_magnetic_roc_falling_period
+What:		/sys/.../events/in_rot_from_north_true_thresh_rising_period
+What:		/sys/.../events/in_rot_from_north_true_thresh_falling_period
+What:		/sys/.../events/in_rot_from_north_true_roc_rising_period
+What:		/sys/.../events/in_rot_from_north_true_roc_falling_period
+What:		/sys/.../events/in_rot_from_north_magnetic_tilt_comp_thresh_rising_period
+What:		/sys/.../events/in_rot_from_north_magnetic_tilt_comp_thresh_falling_period
+What:		/sys/.../events/in_rot_from_north_magnetic_tilt_comp_roc_rising_period
+What:		/sys/.../events/in_rot_from_north_magnetic_tilt_comp_roc_falling_period
+What:		/sys/.../events/in_rot_from_north_true_tilt_comp_thresh_rising_period
+What:		/sys/.../events/in_rot_from_north_true_tilt_comp_thresh_falling_period
+What:		/sys/.../events/in_rot_from_north_true_tilt_comp_roc_rising_period
+What:		/sys/.../events/in_rot_from_north_true_tilt_comp_roc_falling_period
 What:		/sys/.../events/in_voltageY_supply_thresh_rising_period
 What:		/sys/.../events/in_voltageY_supply_thresh_falling_period
 What:		/sys/.../events/in_voltageY_supply_roc_rising_period
@@ -787,6 +851,10 @@ What:		/sys/.../iio:deviceX/scan_elements/in_anglvel_z_en
 What:		/sys/.../iio:deviceX/scan_elements/in_magn_x_en
 What:		/sys/.../iio:deviceX/scan_elements/in_magn_y_en
 What:		/sys/.../iio:deviceX/scan_elements/in_magn_z_en
+What:		/sys/.../iio:deviceX/scan_elements/in_rot_from_north_magnetic_en
+What:		/sys/.../iio:deviceX/scan_elements/in_rot_from_north_true_en
+What:		/sys/.../iio:deviceX/scan_elements/in_rot_from_north_magnetic_tilt_comp_en
+What:		/sys/.../iio:deviceX/scan_elements/in_rot_from_north_true_tilt_comp_en
 What:		/sys/.../iio:deviceX/scan_elements/in_timestamp_en
 What:		/sys/.../iio:deviceX/scan_elements/in_voltageY_supply_en
 What:		/sys/.../iio:deviceX/scan_elements/in_voltageY_en
@@ -853,6 +921,10 @@ What:		/sys/.../iio:deviceX/scan_elements/in_anglvel_z_index
 What:		/sys/.../iio:deviceX/scan_elements/in_magn_x_index
 What:		/sys/.../iio:deviceX/scan_elements/in_magn_y_index
 What:		/sys/.../iio:deviceX/scan_elements/in_magn_z_index
+What:		/sys/.../iio:deviceX/scan_elements/in_rot_from_north_magnetic_index
+What:		/sys/.../iio:deviceX/scan_elements/in_rot_from_north_true_index
+What:		/sys/.../iio:deviceX/scan_elements/in_rot_from_north_magnetic_tilt_comp_index
+What:		/sys/.../iio:deviceX/scan_elements/in_rot_from_north_true_tilt_comp_index
 What:		/sys/.../iio:deviceX/scan_elements/in_incli_x_index
 What:		/sys/.../iio:deviceX/scan_elements/in_incli_y_index
 What:		/sys/.../iio:deviceX/scan_elements/in_timestamp_index
@@ -933,3 +1005,13 @@ Description:
 		x y z w. Here x, y, and z component represents the axis about
 		which a rotation will occur and w component represents the
 		amount of rotation.
+
+What:		/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_magnetic_tilt_comp_raw
+What:		/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_true_tilt_comp_raw
+What:		/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_magnetic_raw
+What:		/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_true_raw
+KernelVersion:	3.15
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Raw value of rotation from true/magnetic north measured with
+		or without compensation from tilt sensors.
-- 
1.9.3

[PATCH v5 2/4] iio: types: Added support for rotation from north usage attributes

[Reyad Attiyat]

Added the rotation from north usage attributes to the iio modifier enum and to the iio modifier names array.

Signed-off-by: Reyad Attiyat <reyad.attiyat@gmail.com>
---
 drivers/iio/industrialio-core.c | 4 ++++
 include/linux/iio/types.h       | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 4b1f375..af3e76d 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -87,6 +87,10 @@ static const char * const iio_modifier_names[] = {
 	[IIO_MOD_QUATERNION] = "quaternion",
 	[IIO_MOD_TEMP_AMBIENT] = "ambient",
 	[IIO_MOD_TEMP_OBJECT] = "object",
+	[IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
+	[IIO_MOD_NORTH_TRUE] = "from_north_true",
+	[IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
+	[IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
 };
 
 /* relies on pairs of these shared then separate */
diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
index d480631..d09c40d 100644
--- a/include/linux/iio/types.h
+++ b/include/linux/iio/types.h
@@ -56,6 +56,10 @@ enum iio_modifier {
 	IIO_MOD_QUATERNION,
 	IIO_MOD_TEMP_AMBIENT,
 	IIO_MOD_TEMP_OBJECT,
+	IIO_MOD_NORTH_MAGN,
+	IIO_MOD_NORTH_TRUE,
+	IIO_MOD_NORTH_MAGN_TILT_COMP,
+	IIO_MOD_NORTH_TRUE_TILT_COMP
 };
 
 enum iio_event_type {
-- 
1.9.3

[PATCH v5 3/4] iio: hid-sensor-magn-3d: Scan for usage attributes before setting up iio channels

[Reyad Attiyat]

Scan for and count the HID usage attributes supported by the driver.
This allows for the driver to only setup the IIO channels for the
sensor usages present in the HID USB reports.

Changes from v4
Renamed iio_val array to iio_vals
Renamed return value of hid sensor attribute for loop
Fixed formatting
Added comment about magn_val_addr and iio_vals
Added more debugging information and checks
Removed static initalizing of scan_index, it is now set dynamically
Use struct iio_chan_spec address field to store magn array index (could be set statically)

Signed-off-by: Reyad Attiyat <reyad.attiyat@gmail.com>
---
 drivers/iio/magnetometer/hid-sensor-magn-3d.c | 144 ++++++++++++++++++--------
 1 file changed, 100 insertions(+), 44 deletions(-)

diff --git a/drivers/iio/magnetometer/hid-sensor-magn-3d.c b/drivers/iio/magnetometer/hid-sensor-magn-3d.c
index 41cf29e..f69664b 100644
--- a/drivers/iio/magnetometer/hid-sensor-magn-3d.c
+++ b/drivers/iio/magnetometer/hid-sensor-magn-3d.c
@@ -42,7 +42,12 @@ struct magn_3d_state {
 	struct hid_sensor_hub_callbacks callbacks;
 	struct hid_sensor_common common_attributes;
 	struct hid_sensor_hub_attribute_info magn[MAGN_3D_CHANNEL_MAX];
-	u32 magn_val[MAGN_3D_CHANNEL_MAX];
+
+	/* dynamically sized array to hold sensor values */
+	u32 *iio_vals;
+	/* array of pointers to sensor value */
+	u32 *magn_val_addr[MAGN_3D_CHANNEL_MAX];
+
 	int scale_pre_decml;
 	int scale_post_decml;
 	int scale_precision;
@@ -66,7 +71,6 @@ static const struct iio_chan_spec magn_3d_channels[] = {
 		BIT(IIO_CHAN_INFO_SCALE) |
 		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 		BIT(IIO_CHAN_INFO_HYSTERESIS),
-		.scan_index = CHANNEL_SCAN_INDEX_X,
 	}, {
 		.type = IIO_MAGN,
 		.modified = 1,
@@ -76,7 +80,6 @@ static const struct iio_chan_spec magn_3d_channels[] = {
 		BIT(IIO_CHAN_INFO_SCALE) |
 		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 		BIT(IIO_CHAN_INFO_HYSTERESIS),
-		.scan_index = CHANNEL_SCAN_INDEX_Y,
 	}, {
 		.type = IIO_MAGN,
 		.modified = 1,
@@ -86,7 +89,6 @@ static const struct iio_chan_spec magn_3d_channels[] = {
 		BIT(IIO_CHAN_INFO_SCALE) |
 		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 		BIT(IIO_CHAN_INFO_HYSTERESIS),
-		.scan_index = CHANNEL_SCAN_INDEX_Z,
 	}
 };
 
@@ -127,8 +129,8 @@ static int magn_3d_read_raw(struct iio_dev *indio_dev,
 		msleep_interruptible(poll_value * 2);
 
 		report_id =
-			magn_state->magn[chan->scan_index].report_id;
-		address = magn_3d_addresses[chan->scan_index];
+			magn_state->magn[chan->address].report_id;
+		address = magn_3d_addresses[chan->address];
 		if (report_id >= 0)
 			*val = sensor_hub_input_attr_get_raw_value(
 				magn_state->common_attributes.hsdev,
@@ -221,8 +223,8 @@ static int magn_3d_proc_event(struct hid_sensor_hub_device *hsdev,
 	dev_dbg(&indio_dev->dev, "magn_3d_proc_event\n");
 	if (atomic_read(&magn_state->common_attributes.data_ready))
 		hid_sensor_push_data(indio_dev,
-				magn_state->magn_val,
-				sizeof(magn_state->magn_val));
+				magn_state->iio_vals,
+				sizeof(magn_state->iio_vals));
 
 	return 0;
 }
@@ -236,52 +238,114 @@ static int magn_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
 	struct iio_dev *indio_dev = platform_get_drvdata(priv);
 	struct magn_3d_state *magn_state = iio_priv(indio_dev);
 	int offset;
-	int ret = -EINVAL;
+	int ret = 0;
+	u32 *iio_val = NULL;
 
 	switch (usage_id) {
 	case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS:
 	case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS:
 	case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS:
-		offset = usage_id - HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS;
-		magn_state->magn_val[CHANNEL_SCAN_INDEX_X + offset] =
-						*(u32 *)raw_data;
-		ret = 0;
+		offset = (usage_id - HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS)
+				+ CHANNEL_SCAN_INDEX_X;
 	break;
 	default:
-		break;
+		return -EINVAL;
 	}
 
+	if (!!(iio_val = magn_state->magn_val_addr[offset]))
+		*iio_val = *(u32 *)raw_data;
+	else
+		ret = -EINVAL;
+
 	return ret;
 }
 
 /* Parse report which is specific to an usage id*/
 static int magn_3d_parse_report(struct platform_device *pdev,
 				struct hid_sensor_hub_device *hsdev,
-				struct iio_chan_spec *channels,
+				struct iio_chan_spec **channels,
+				int *chan_count,
 				unsigned usage_id,
 				struct magn_3d_state *st)
 {
-	int ret;
 	int i;
+	int attr_count = 0;
+
+	/* Scan for each usage attribute supported */
+	for (i = 0; i < MAGN_3D_CHANNEL_MAX; i++) {
+		int status;
+		u32 address = magn_3d_addresses[i];
+
+		/* Check if usage attribute exists in the sensor hub device */
+		status = sensor_hub_input_get_attribute_info(hsdev,
+			HID_INPUT_REPORT,
+			usage_id,
+			address,
+			&(st->magn[i]));
+		if (!status)
+			attr_count++;
+	}
 
-	for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
-		ret = sensor_hub_input_get_attribute_info(hsdev,
-				HID_INPUT_REPORT,
-				usage_id,
-				HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS + i,
-				&st->magn[CHANNEL_SCAN_INDEX_X + i]);
-		if (ret < 0)
-			break;
-		magn_3d_adjust_channel_bit_mask(channels,
-				CHANNEL_SCAN_INDEX_X + i,
-				st->magn[CHANNEL_SCAN_INDEX_X + i].size);
+	if (attr_count <= 0) {
+		dev_err(&pdev->dev,
+			"failed to find any supported usage attributes in report\n");
+		return  -EINVAL;
 	}
-	dev_dbg(&pdev->dev, "magn_3d %x:%x, %x:%x, %x:%x\n",
+
+	dev_dbg(&pdev->dev, "magn_3d Found %d usage attributes\n",
+			attr_count);
+	dev_dbg(&pdev->dev, "magn_3d X: %x:%x Y: %x:%x Z: %x:%x\n",
 			st->magn[0].index,
 			st->magn[0].report_id,
 			st->magn[1].index, st->magn[1].report_id,
 			st->magn[2].index, st->magn[2].report_id);
 
+	/* Setup IIO channel array */
+	*channels = devm_kcalloc(&pdev->dev, attr_count,
+				sizeof(struct iio_chan_spec),
+				GFP_KERNEL);
+	if (!*channels) {
+		dev_err(&pdev->dev,
+			"failed to allocate space for iio channels\n");
+		return -ENOMEM;
+	}
+
+	st->iio_vals = devm_kcalloc(&pdev->dev, attr_count,
+				sizeof(u32),
+				GFP_KERNEL);
+	if (!st->iio_vals) {
+		dev_err(&pdev->dev,
+			"failed to allocate space for iio values array\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0, *chan_count = 0;
+	i < MAGN_3D_CHANNEL_MAX && *chan_count < attr_count;
+	i++){
+		if (st->magn[i].index >= 0) {
+			/* Setup IIO channel struct */
+			(*channels[*chan_count]) = magn_3d_channels[i];
+			(*channels[*chan_count]).scan_index = *chan_count;
+			(*channels[*chan_count]).address = i;
+
+			/* Set magn_val_addr to iio value address */
+			st->magn_val_addr[i] = &(st->iio_vals[*chan_count]);
+			magn_3d_adjust_channel_bit_mask(*channels,
+							*chan_count,
+							st->magn[i].size);
+			(*chan_count)++;
+		}
+	}
+
+	if (*chan_count <= 0) {
+		dev_err(&pdev->dev,
+			"failed to find any magnetic channels setup\n");
+		return -EINVAL;
+	}
+
+	dev_dbg(&pdev->dev, "magn_3d Setup %d IIO channels\n",
+			*chan_count);
+
 	st->scale_precision = hid_sensor_format_scale(
 				HID_USAGE_SENSOR_COMPASS_3D,
 				&st->magn[CHANNEL_SCAN_INDEX_X],
@@ -299,7 +363,7 @@ static int magn_3d_parse_report(struct platform_device *pdev,
 			st->common_attributes.sensitivity.report_id);
 	}
 
-	return ret;
+	return 0;
 }
 
 /* Function to initialize the processing for usage id */
@@ -311,6 +375,7 @@ static int hid_magn_3d_probe(struct platform_device *pdev)
 	struct magn_3d_state *magn_state;
 	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 	struct iio_chan_spec *channels;
+	int chan_count = 0;
 
 	indio_dev = devm_iio_device_alloc(&pdev->dev,
 					  sizeof(struct magn_3d_state));
@@ -331,22 +396,16 @@ static int hid_magn_3d_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	channels = kmemdup(magn_3d_channels, sizeof(magn_3d_channels),
-			   GFP_KERNEL);
-	if (!channels) {
-		dev_err(&pdev->dev, "failed to duplicate channels\n");
-		return -ENOMEM;
-	}
-
-	ret = magn_3d_parse_report(pdev, hsdev, channels,
+	ret = magn_3d_parse_report(pdev, hsdev,
+				&channels, &chan_count,
 				HID_USAGE_SENSOR_COMPASS_3D, magn_state);
 	if (ret) {
-		dev_err(&pdev->dev, "failed to setup attributes\n");
-		goto error_free_dev_mem;
+		dev_err(&pdev->dev, "failed to parse report\n");
+		return ret;
 	}
 
 	indio_dev->channels = channels;
-	indio_dev->num_channels = ARRAY_SIZE(magn_3d_channels);
+	indio_dev->num_channels = chan_count;
 	indio_dev->dev.parent = &pdev->dev;
 	indio_dev->info = &magn_3d_info;
 	indio_dev->name = name;
@@ -356,7 +415,7 @@ static int hid_magn_3d_probe(struct platform_device *pdev)
 		NULL, NULL);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
-		goto error_free_dev_mem;
+		return ret;
 	}
 	atomic_set(&magn_state->common_attributes.data_ready, 0);
 	ret = hid_sensor_setup_trigger(indio_dev, name,
@@ -390,8 +449,6 @@ error_remove_trigger:
 	hid_sensor_remove_trigger(&magn_state->common_attributes);
 error_unreg_buffer_funcs:
 	iio_triggered_buffer_cleanup(indio_dev);
-error_free_dev_mem:
-	kfree(indio_dev->channels);
 	return ret;
 }
 
@@ -406,7 +463,6 @@ static int hid_magn_3d_remove(struct platform_device *pdev)
 	iio_device_unregister(indio_dev);
 	hid_sensor_remove_trigger(&magn_state->common_attributes);
 	iio_triggered_buffer_cleanup(indio_dev);
-	kfree(indio_dev->channels);
 
 	return 0;
 }
-- 
1.9.3

[PATCH v5 4/4] iio: hid-sensor-magn-3d: Add support for rotation from north

[Reyad Attiyat]

Add the HID usage attribute ID's and IIO channel info for rotation
from north support.

Changes from v4
Removed the scan index as this is set dynamically

Signed-off-by: Reyad Attiyat <reyad.attiyat@gmail.com>
---
 drivers/iio/magnetometer/hid-sensor-magn-3d.c | 53 ++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/magnetometer/hid-sensor-magn-3d.c b/drivers/iio/magnetometer/hid-sensor-magn-3d.c
index f69664b..b9391c5 100644
--- a/drivers/iio/magnetometer/hid-sensor-magn-3d.c
+++ b/drivers/iio/magnetometer/hid-sensor-magn-3d.c
@@ -35,6 +35,10 @@ enum magn_3d_channel {
 	CHANNEL_SCAN_INDEX_X,
 	CHANNEL_SCAN_INDEX_Y,
 	CHANNEL_SCAN_INDEX_Z,
+	CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP,
+	CHANNEL_SCAN_INDEX_NORTH_TRUE_TILT_COMP,
+	CHANNEL_SCAN_INDEX_NORTH_MAGN,
+	CHANNEL_SCAN_INDEX_NORTH_TRUE,
 	MAGN_3D_CHANNEL_MAX,
 };
 
@@ -57,7 +61,11 @@ struct magn_3d_state {
 static const u32 magn_3d_addresses[MAGN_3D_CHANNEL_MAX] = {
 	HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS,
 	HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS,
-	HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS
+	HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS,
+	HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH,
+	HID_USAGE_SENSOR_ORIENT_COMP_TRUE_NORTH,
+	HID_USAGE_SENSOR_ORIENT_MAGN_NORTH,
+	HID_USAGE_SENSOR_ORIENT_TRUE_NORTH,
 };
 
 /* Channel definitions */
@@ -89,6 +97,42 @@ static const struct iio_chan_spec magn_3d_channels[] = {
 		BIT(IIO_CHAN_INFO_SCALE) |
 		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 		BIT(IIO_CHAN_INFO_HYSTERESIS),
+	}, {
+		.type = IIO_ROT,
+		.modified = 1,
+		.channel2 = IIO_MOD_NORTH_MAGN_TILT_COMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
+		BIT(IIO_CHAN_INFO_SCALE) |
+		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
+		BIT(IIO_CHAN_INFO_HYSTERESIS),
+	}, {
+		.type = IIO_ROT,
+		.modified = 1,
+		.channel2 = IIO_MOD_NORTH_TRUE_TILT_COMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
+		BIT(IIO_CHAN_INFO_SCALE) |
+		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
+		BIT(IIO_CHAN_INFO_HYSTERESIS),
+	}, {
+		.type = IIO_ROT,
+		.modified = 1,
+		.channel2 = IIO_MOD_NORTH_MAGN,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
+		BIT(IIO_CHAN_INFO_SCALE) |
+		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
+		BIT(IIO_CHAN_INFO_HYSTERESIS),
+	}, {
+		.type = IIO_ROT,
+		.modified = 1,
+		.channel2 = IIO_MOD_NORTH_TRUE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
+		BIT(IIO_CHAN_INFO_SCALE) |
+		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
+		BIT(IIO_CHAN_INFO_HYSTERESIS),
 	}
 };
 
@@ -248,6 +292,13 @@ static int magn_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
 		offset = (usage_id - HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS)
 				+ CHANNEL_SCAN_INDEX_X;
 	break;
+	case HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH:
+	case HID_USAGE_SENSOR_ORIENT_COMP_TRUE_NORTH:
+	case HID_USAGE_SENSOR_ORIENT_MAGN_NORTH:
+	case HID_USAGE_SENSOR_ORIENT_TRUE_NORTH:
+		offset = (usage_id - HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH)
+				+ CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP;
+	break;
 	default:
 		return -EINVAL;
 	}
-- 
1.9.3

Re: [PATCH v5 3/4] iio: hid-sensor-magn-3d: Scan for usage attributes before setting up iio channels

[Reyad Attiyat]

Hey  Jonathan,

I noticed this patch fails checkpatch script. I made small change and
forgot to double check, sorry.
It complains of assigment in if statement in capture_value:
if (!!(iio_val = magn_state->magn_val_addr[offset]))


I'll break this into two lines if your ok with this implementation and
don't believe it needs any other changes

Thanks.

On Wed, Jul 9, 2014 at 2:30 PM, Reyad Attiyat <reyad.attiyat@gmail.com> wrote:
> Scan for and count the HID usage attributes supported by the driver.
> This allows for the driver to only setup the IIO channels for the
> sensor usages present in the HID USB reports.
>
> Changes from v4
> Renamed iio_val array to iio_vals
> Renamed return value of hid sensor attribute for loop
> Fixed formatting
> Added comment about magn_val_addr and iio_vals
> Added more debugging information and checks
> Removed static initalizing of scan_index, it is now set dynamically
> Use struct iio_chan_spec address field to store magn array index (could be set statically)
>
> Signed-off-by: Reyad Attiyat <reyad.attiyat@gmail.com>
> ---
>  drivers/iio/magnetometer/hid-sensor-magn-3d.c | 144 ++++++++++++++++++--------
>  1 file changed, 100 insertions(+), 44 deletions(-)
>
> diff --git a/drivers/iio/magnetometer/hid-sensor-magn-3d.c b/drivers/iio/magnetometer/hid-sensor-magn-3d.c
> index 41cf29e..f69664b 100644
> --- a/drivers/iio/magnetometer/hid-sensor-magn-3d.c
> +++ b/drivers/iio/magnetometer/hid-sensor-magn-3d.c
> @@ -42,7 +42,12 @@ struct magn_3d_state {
>         struct hid_sensor_hub_callbacks callbacks;
>         struct hid_sensor_common common_attributes;
>         struct hid_sensor_hub_attribute_info magn[MAGN_3D_CHANNEL_MAX];
> -       u32 magn_val[MAGN_3D_CHANNEL_MAX];
> +
> +       /* dynamically sized array to hold sensor values */
> +       u32 *iio_vals;
> +       /* array of pointers to sensor value */
> +       u32 *magn_val_addr[MAGN_3D_CHANNEL_MAX];
> +
>         int scale_pre_decml;
>         int scale_post_decml;
>         int scale_precision;
> @@ -66,7 +71,6 @@ static const struct iio_chan_spec magn_3d_channels[] = {
>                 BIT(IIO_CHAN_INFO_SCALE) |
>                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
>                 BIT(IIO_CHAN_INFO_HYSTERESIS),
> -               .scan_index = CHANNEL_SCAN_INDEX_X,
>         }, {
>                 .type = IIO_MAGN,
>                 .modified = 1,
> @@ -76,7 +80,6 @@ static const struct iio_chan_spec magn_3d_channels[] = {
>                 BIT(IIO_CHAN_INFO_SCALE) |
>                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
>                 BIT(IIO_CHAN_INFO_HYSTERESIS),
> -               .scan_index = CHANNEL_SCAN_INDEX_Y,
>         }, {
>                 .type = IIO_MAGN,
>                 .modified = 1,
> @@ -86,7 +89,6 @@ static const struct iio_chan_spec magn_3d_channels[] = {
>                 BIT(IIO_CHAN_INFO_SCALE) |
>                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
>                 BIT(IIO_CHAN_INFO_HYSTERESIS),
> -               .scan_index = CHANNEL_SCAN_INDEX_Z,
>         }
>  };
>
> @@ -127,8 +129,8 @@ static int magn_3d_read_raw(struct iio_dev *indio_dev,
>                 msleep_interruptible(poll_value * 2);
>
>                 report_id =
> -                       magn_state->magn[chan->scan_index].report_id;
> -               address = magn_3d_addresses[chan->scan_index];
> +                       magn_state->magn[chan->address].report_id;
> +               address = magn_3d_addresses[chan->address];
>                 if (report_id >= 0)
>                         *val = sensor_hub_input_attr_get_raw_value(
>                                 magn_state->common_attributes.hsdev,
> @@ -221,8 +223,8 @@ static int magn_3d_proc_event(struct hid_sensor_hub_device *hsdev,
>         dev_dbg(&indio_dev->dev, "magn_3d_proc_event\n");
>         if (atomic_read(&magn_state->common_attributes.data_ready))
>                 hid_sensor_push_data(indio_dev,
> -                               magn_state->magn_val,
> -                               sizeof(magn_state->magn_val));
> +                               magn_state->iio_vals,
> +                               sizeof(magn_state->iio_vals));
>
>         return 0;
>  }
> @@ -236,52 +238,114 @@ static int magn_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
>         struct iio_dev *indio_dev = platform_get_drvdata(priv);
>         struct magn_3d_state *magn_state = iio_priv(indio_dev);
>         int offset;
> -       int ret = -EINVAL;
> +       int ret = 0;
> +       u32 *iio_val = NULL;
>
>         switch (usage_id) {
>         case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS:
>         case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS:
>         case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS:
> -               offset = usage_id - HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS;
> -               magn_state->magn_val[CHANNEL_SCAN_INDEX_X + offset] =
> -                                               *(u32 *)raw_data;
> -               ret = 0;
> +               offset = (usage_id - HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS)
> +                               + CHANNEL_SCAN_INDEX_X;
>         break;
>         default:
> -               break;
> +               return -EINVAL;
>         }
>
> +       if (!!(iio_val = magn_state->magn_val_addr[offset]))
> +               *iio_val = *(u32 *)raw_data;
> +       else
> +               ret = -EINVAL;
> +
>         return ret;
>  }
>
>  /* Parse report which is specific to an usage id*/
>  static int magn_3d_parse_report(struct platform_device *pdev,
>                                 struct hid_sensor_hub_device *hsdev,
> -                               struct iio_chan_spec *channels,
> +                               struct iio_chan_spec **channels,
> +                               int *chan_count,
>                                 unsigned usage_id,
>                                 struct magn_3d_state *st)
>  {
> -       int ret;
>         int i;
> +       int attr_count = 0;
> +
> +       /* Scan for each usage attribute supported */
> +       for (i = 0; i < MAGN_3D_CHANNEL_MAX; i++) {
> +               int status;
> +               u32 address = magn_3d_addresses[i];
> +
> +               /* Check if usage attribute exists in the sensor hub device */
> +               status = sensor_hub_input_get_attribute_info(hsdev,
> +                       HID_INPUT_REPORT,
> +                       usage_id,
> +                       address,
> +                       &(st->magn[i]));
> +               if (!status)
> +                       attr_count++;
> +       }
>
> -       for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
> -               ret = sensor_hub_input_get_attribute_info(hsdev,
> -                               HID_INPUT_REPORT,
> -                               usage_id,
> -                               HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS + i,
> -                               &st->magn[CHANNEL_SCAN_INDEX_X + i]);
> -               if (ret < 0)
> -                       break;
> -               magn_3d_adjust_channel_bit_mask(channels,
> -                               CHANNEL_SCAN_INDEX_X + i,
> -                               st->magn[CHANNEL_SCAN_INDEX_X + i].size);
> +       if (attr_count <= 0) {
> +               dev_err(&pdev->dev,
> +                       "failed to find any supported usage attributes in report\n");
> +               return  -EINVAL;
>         }
> -       dev_dbg(&pdev->dev, "magn_3d %x:%x, %x:%x, %x:%x\n",
> +
> +       dev_dbg(&pdev->dev, "magn_3d Found %d usage attributes\n",
> +                       attr_count);
> +       dev_dbg(&pdev->dev, "magn_3d X: %x:%x Y: %x:%x Z: %x:%x\n",
>                         st->magn[0].index,
>                         st->magn[0].report_id,
>                         st->magn[1].index, st->magn[1].report_id,
>                         st->magn[2].index, st->magn[2].report_id);
>
> +       /* Setup IIO channel array */
> +       *channels = devm_kcalloc(&pdev->dev, attr_count,
> +                               sizeof(struct iio_chan_spec),
> +                               GFP_KERNEL);
> +       if (!*channels) {
> +               dev_err(&pdev->dev,
> +                       "failed to allocate space for iio channels\n");
> +               return -ENOMEM;
> +       }
> +
> +       st->iio_vals = devm_kcalloc(&pdev->dev, attr_count,
> +                               sizeof(u32),
> +                               GFP_KERNEL);
> +       if (!st->iio_vals) {
> +               dev_err(&pdev->dev,
> +                       "failed to allocate space for iio values array\n");
> +               return -ENOMEM;
> +       }
> +
> +       for (i = 0, *chan_count = 0;
> +       i < MAGN_3D_CHANNEL_MAX && *chan_count < attr_count;
> +       i++){
> +               if (st->magn[i].index >= 0) {
> +                       /* Setup IIO channel struct */
> +                       (*channels[*chan_count]) = magn_3d_channels[i];
> +                       (*channels[*chan_count]).scan_index = *chan_count;
> +                       (*channels[*chan_count]).address = i;
> +
> +                       /* Set magn_val_addr to iio value address */
> +                       st->magn_val_addr[i] = &(st->iio_vals[*chan_count]);
> +                       magn_3d_adjust_channel_bit_mask(*channels,
> +                                                       *chan_count,
> +                                                       st->magn[i].size);
> +                       (*chan_count)++;
> +               }
> +       }
> +
> +       if (*chan_count <= 0) {
> +               dev_err(&pdev->dev,
> +                       "failed to find any magnetic channels setup\n");
> +               return -EINVAL;
> +       }
> +
> +       dev_dbg(&pdev->dev, "magn_3d Setup %d IIO channels\n",
> +                       *chan_count);
> +
>         st->scale_precision = hid_sensor_format_scale(
>                                 HID_USAGE_SENSOR_COMPASS_3D,
>                                 &st->magn[CHANNEL_SCAN_INDEX_X],
> @@ -299,7 +363,7 @@ static int magn_3d_parse_report(struct platform_device *pdev,
>                         st->common_attributes.sensitivity.report_id);
>         }
>
> -       return ret;
> +       return 0;
>  }
>
>  /* Function to initialize the processing for usage id */
> @@ -311,6 +375,7 @@ static int hid_magn_3d_probe(struct platform_device *pdev)
>         struct magn_3d_state *magn_state;
>         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
>         struct iio_chan_spec *channels;
> +       int chan_count = 0;
>
>         indio_dev = devm_iio_device_alloc(&pdev->dev,
>                                           sizeof(struct magn_3d_state));
> @@ -331,22 +396,16 @@ static int hid_magn_3d_probe(struct platform_device *pdev)
>                 return ret;
>         }
>
> -       channels = kmemdup(magn_3d_channels, sizeof(magn_3d_channels),
> -                          GFP_KERNEL);
> -       if (!channels) {
> -               dev_err(&pdev->dev, "failed to duplicate channels\n");
> -               return -ENOMEM;
> -       }
> -
> -       ret = magn_3d_parse_report(pdev, hsdev, channels,
> +       ret = magn_3d_parse_report(pdev, hsdev,
> +                               &channels, &chan_count,
>                                 HID_USAGE_SENSOR_COMPASS_3D, magn_state);
>         if (ret) {
> -               dev_err(&pdev->dev, "failed to setup attributes\n");
> -               goto error_free_dev_mem;
> +               dev_err(&pdev->dev, "failed to parse report\n");
> +               return ret;
>         }
>
>         indio_dev->channels = channels;
> -       indio_dev->num_channels = ARRAY_SIZE(magn_3d_channels);
> +       indio_dev->num_channels = chan_count;
>         indio_dev->dev.parent = &pdev->dev;
>         indio_dev->info = &magn_3d_info;
>         indio_dev->name = name;
> @@ -356,7 +415,7 @@ static int hid_magn_3d_probe(struct platform_device *pdev)
>                 NULL, NULL);
>         if (ret) {
>                 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
> -               goto error_free_dev_mem;
> +               return ret;
>         }
>         atomic_set(&magn_state->common_attributes.data_ready, 0);
>         ret = hid_sensor_setup_trigger(indio_dev, name,
> @@ -390,8 +449,6 @@ error_remove_trigger:
>         hid_sensor_remove_trigger(&magn_state->common_attributes);
>  error_unreg_buffer_funcs:
>         iio_triggered_buffer_cleanup(indio_dev);
> -error_free_dev_mem:
> -       kfree(indio_dev->channels);
>         return ret;
>  }
>
> @@ -406,7 +463,6 @@ static int hid_magn_3d_remove(struct platform_device *pdev)
>         iio_device_unregister(indio_dev);
>         hid_sensor_remove_trigger(&magn_state->common_attributes);
>         iio_triggered_buffer_cleanup(indio_dev);
> -       kfree(indio_dev->channels);
>
>         return 0;
>  }
> --
> 1.9.3
>

Re: [PATCH v5 0/4] iio: Add support for rotation from north

[Srinivas Pandruvada]

On 07/09/2014 12:30 PM, Reyad Attiyat wrote:
> This series of patches modifies magn-3d driver to handle the rotation
> from north usage. This is done by scanning the report and then building
> the iio arrays (vals and channels) dynamically.
>
> Changes from V4
> I use the address field of struct iio_chan_spec to hold the array index
> of the usage attribute. The scan_index field is generated when creating
> an iio channel.
>
> Reyad Attiyat (4):
>    iio: Documentation: Add documentation for rotation from north sensor
>      usage attributes
>    iio: types: Added support for rotation from north usage attributes
>    iio: hid-sensor-magn-3d: Scan for usage attributes before setting up
>      iio channels
>    iio: hid-sensor-magn-3d: Add support for rotation from north
>
>   Documentation/ABI/testing/sysfs-bus-iio       |  82 +++++++++++
>   drivers/iio/industrialio-core.c               |   4 +
>   drivers/iio/magnetometer/hid-sensor-magn-3d.c | 199 ++++++++++++++++++++------
>   include/linux/iio/types.h                     |   4 +
>   4 files changed, 245 insertions(+), 44 deletions(-)
>
Did you get chance to look at the cause of panic?

Thanks,
Srinivas

Re: [PATCH v5 0/4] iio: Add support for rotation from north

[Reyad Attiyat]

Hey Srinivas,

I did look into the panic you sent. I wasn't sure exactly what caused
the NULL pointer.
I tested it with out applying the last rotation from north patch, so
no hid usages are found, my device only has rotation_from_north, and
hid_parse_report() would return -EINVAL.
I added another check to make sure a iio channel were set up, and
return -EINVAL if not, but couldn't think of anything else.

Could you test this version with dynamic debugging and see if it is
finding any hid usage attributes.
Any ideas what could cause this? I think I'm handling errors properly
by returning what parse_report returns (-EINVAL or -ENOMEM) in probe

Thanks,
Reyad Attiyat

On Wed, Jul 9, 2014 at 2:45 PM, Srinivas Pandruvada
<srinivas.pandruvada@linux.intel.com> wrote:
> On 07/09/2014 12:30 PM, Reyad Attiyat wrote:
>>
>> This series of patches modifies magn-3d driver to handle the rotation
>> from north usage. This is done by scanning the report and then building
>> the iio arrays (vals and channels) dynamically.
>>
>> Changes from V4
>> I use the address field of struct iio_chan_spec to hold the array index
>> of the usage attribute. The scan_index field is generated when creating
>> an iio channel.
>>
>> Reyad Attiyat (4):
>>    iio: Documentation: Add documentation for rotation from north sensor
>>      usage attributes
>>    iio: types: Added support for rotation from north usage attributes
>>    iio: hid-sensor-magn-3d: Scan for usage attributes before setting up
>>      iio channels
>>    iio: hid-sensor-magn-3d: Add support for rotation from north
>>
>>   Documentation/ABI/testing/sysfs-bus-iio       |  82 +++++++++++
>>   drivers/iio/industrialio-core.c               |   4 +
>>   drivers/iio/magnetometer/hid-sensor-magn-3d.c | 199
>> ++++++++++++++++++++------
>>   include/linux/iio/types.h                     |   4 +
>>   4 files changed, 245 insertions(+), 44 deletions(-)
>>
> Did you get chance to look at the cause of panic?
>
> Thanks,
> Srinivas

Re: [PATCH v5 0/4] iio: Add support for rotation from north

[Jonathan Cameron]

On 09/07/14 23:12, Reyad Attiyat wrote:
> Hey Srinivas,
>
> I did look into the panic you sent. I wasn't sure exactly what caused
> the NULL pointer.
> I tested it with out applying the last rotation from north patch, so
> no hid usages are found, my device only has rotation_from_north, and
> hid_parse_report() would return -EINVAL.
> I added another check to make sure a iio channel were set up, and
> return -EINVAL if not, but couldn't think of anything else.
>
> Could you test this version with dynamic debugging and see if it is
> finding any hid usage attributes.
> Any ideas what could cause this? I think I'm handling errors properly
> by returning what parse_report returns (-EINVAL or -ENOMEM) in probe
>
> Thanks,
> Reyad Attiyat
Just to confirm what you may suspect...  I'm holding this series until
Srinivas and Reyad have confirmed the cause of Srinivas' panic.

Jonathan
>
> On Wed, Jul 9, 2014 at 2:45 PM, Srinivas Pandruvada
> <srinivas.pandruvada@linux.intel.com> wrote:
>> On 07/09/2014 12:30 PM, Reyad Attiyat wrote:
>>>
>>> This series of patches modifies magn-3d driver to handle the rotation
>>> from north usage. This is done by scanning the report and then building
>>> the iio arrays (vals and channels) dynamically.
>>>
>>> Changes from V4
>>> I use the address field of struct iio_chan_spec to hold the array index
>>> of the usage attribute. The scan_index field is generated when creating
>>> an iio channel.
>>>
>>> Reyad Attiyat (4):
>>>     iio: Documentation: Add documentation for rotation from north sensor
>>>       usage attributes
>>>     iio: types: Added support for rotation from north usage attributes
>>>     iio: hid-sensor-magn-3d: Scan for usage attributes before setting up
>>>       iio channels
>>>     iio: hid-sensor-magn-3d: Add support for rotation from north
>>>
>>>    Documentation/ABI/testing/sysfs-bus-iio       |  82 +++++++++++
>>>    drivers/iio/industrialio-core.c               |   4 +
>>>    drivers/iio/magnetometer/hid-sensor-magn-3d.c | 199
>>> ++++++++++++++++++++------
>>>    include/linux/iio/types.h                     |   4 +
>>>    4 files changed, 245 insertions(+), 44 deletions(-)
>>>
>> Did you get chance to look at the cause of panic?
>>
>> Thanks,
>> Srinivas
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>

Re: [PATCH v5 0/4] iio: Add support for rotation from north

[Srinivas Pandruvada]

[-- Attachment #1: Type: text/plain, Size: 2275 bytes --]

Hi,

Since you have only one attribute, it is working for you.
There is a dereference error in *channels.

Check the attached diff, which will fix this.

Thanks,
Srinivas

On 07/09/2014 03:12 PM, Reyad Attiyat wrote:
> Hey Srinivas,
>
> I did look into the panic you sent. I wasn't sure exactly what caused
> the NULL pointer.
> I tested it with out applying the last rotation from north patch, so
> no hid usages are found, my device only has rotation_from_north, and
> hid_parse_report() would return -EINVAL.
> I added another check to make sure a iio channel were set up, and
> return -EINVAL if not, but couldn't think of anything else.
>
> Could you test this version with dynamic debugging and see if it is
> finding any hid usage attributes.
> Any ideas what could cause this? I think I'm handling errors properly
> by returning what parse_report returns (-EINVAL or -ENOMEM) in probe
>
> Thanks,
> Reyad Attiyat
>
> On Wed, Jul 9, 2014 at 2:45 PM, Srinivas Pandruvada
> <srinivas.pandruvada@linux.intel.com> wrote:
>> On 07/09/2014 12:30 PM, Reyad Attiyat wrote:
>>> This series of patches modifies magn-3d driver to handle the rotation
>>> from north usage. This is done by scanning the report and then building
>>> the iio arrays (vals and channels) dynamically.
>>>
>>> Changes from V4
>>> I use the address field of struct iio_chan_spec to hold the array index
>>> of the usage attribute. The scan_index field is generated when creating
>>> an iio channel.
>>>
>>> Reyad Attiyat (4):
>>>     iio: Documentation: Add documentation for rotation from north sensor
>>>       usage attributes
>>>     iio: types: Added support for rotation from north usage attributes
>>>     iio: hid-sensor-magn-3d: Scan for usage attributes before setting up
>>>       iio channels
>>>     iio: hid-sensor-magn-3d: Add support for rotation from north
>>>
>>>    Documentation/ABI/testing/sysfs-bus-iio       |  82 +++++++++++
>>>    drivers/iio/industrialio-core.c               |   4 +
>>>    drivers/iio/magnetometer/hid-sensor-magn-3d.c | 199
>>> ++++++++++++++++++++------
>>>    include/linux/iio/types.h                     |   4 +
>>>    4 files changed, 245 insertions(+), 44 deletions(-)
>>>
>> Did you get chance to look at the cause of panic?
>>
>> Thanks,
>> Srinivas


[-- Attachment #2: hid-sensor-magn-3d.diff --]
[-- Type: text/x-patch, Size: 1587 bytes --]

diff --git a/drivers/iio/magnetometer/hid-sensor-magn-3d.c b/drivers/iio/magnetometer/hid-sensor-magn-3d.c
index 070d20e..63f23af 100644
--- a/drivers/iio/magnetometer/hid-sensor-magn-3d.c
+++ b/drivers/iio/magnetometer/hid-sensor-magn-3d.c
@@ -271,6 +271,7 @@ static int magn_3d_parse_report(struct platform_device *pdev,
 	int ret = 0;
 	int i;
 	int attr_count = 0;
+	struct iio_chan_spec *_channels;
 
 	/* Scan for each usage attribute supported */
 	for (i = 0; i < MAGN_3D_CHANNEL_MAX; i++) {
@@ -300,10 +301,10 @@ static int magn_3d_parse_report(struct platform_device *pdev,
 		return  -EINVAL;
 
 	/* Setup IIO channel array */
-	*channels = devm_kcalloc(&pdev->dev, attr_count,
+	_channels = devm_kcalloc(&pdev->dev, attr_count,
 								sizeof(struct iio_chan_spec),
 								GFP_KERNEL);
-	if (!*channels) {
+	if (!_channels) {
 		dev_err(&pdev->dev, "failed to allocate space for iio channels\n");
 		return -ENOMEM;
 	}
@@ -322,14 +323,16 @@ static int magn_3d_parse_report(struct platform_device *pdev,
 	{
 		if (st->magn[i].index >= 0) {
 			/* Setup IIO channel struct */
-			*channels[*chan_count] = magn_3d_channels[i];
+			_channels[*chan_count] = magn_3d_channels[i];
 
 			st->magn_val_addr[i] = &(st->iio_val[*chan_count]);
-			magn_3d_adjust_channel_bit_mask(*channels, *chan_count, st->magn[i].size);
+			magn_3d_adjust_channel_bit_mask(_channels, *chan_count, st->magn[i].size);
 			(*chan_count)++;
 		}
 	}
 
+	*channels = _channels;
+
 	st->scale_precision = hid_sensor_format_scale(
 				HID_USAGE_SENSOR_COMPASS_3D,
 				&st->magn[CHANNEL_SCAN_INDEX_X],

Re: [PATCH v5 0/4] iio: Add support for rotation from north

[Reyad Attiyat]

Hey Srinivas

Thanks for looking into this for me!
I'll fix it up and resubmit soon.

On Tue, Jul 15, 2014 at 4:39 PM, Srinivas Pandruvada
<srinivas.pandruvada@linux.intel.com> wrote:
> Hi,
>
> Since you have only one attribute, it is working for you.
> There is a dereference error in *channels.
>
> Check the attached diff, which will fix this.
>
> Thanks,
> Srinivas
>
>
> On 07/09/2014 03:12 PM, Reyad Attiyat wrote:
>>
>> Hey Srinivas,
>>
>> I did look into the panic you sent. I wasn't sure exactly what caused
>> the NULL pointer.
>> I tested it with out applying the last rotation from north patch, so
>> no hid usages are found, my device only has rotation_from_north, and
>> hid_parse_report() would return -EINVAL.
>> I added another check to make sure a iio channel were set up, and
>> return -EINVAL if not, but couldn't think of anything else.
>>
>> Could you test this version with dynamic debugging and see if it is
>> finding any hid usage attributes.
>> Any ideas what could cause this? I think I'm handling errors properly
>> by returning what parse_report returns (-EINVAL or -ENOMEM) in probe
>>
>> Thanks,
>> Reyad Attiyat
>>
>> On Wed, Jul 9, 2014 at 2:45 PM, Srinivas Pandruvada
>> <srinivas.pandruvada@linux.intel.com> wrote:
>>>
>>> On 07/09/2014 12:30 PM, Reyad Attiyat wrote:
>>>>
>>>> This series of patches modifies magn-3d driver to handle the rotation
>>>> from north usage. This is done by scanning the report and then building
>>>> the iio arrays (vals and channels) dynamically.
>>>>
>>>> Changes from V4
>>>> I use the address field of struct iio_chan_spec to hold the array index
>>>> of the usage attribute. The scan_index field is generated when creating
>>>> an iio channel.
>>>>
>>>> Reyad Attiyat (4):
>>>>     iio: Documentation: Add documentation for rotation from north sensor
>>>>       usage attributes
>>>>     iio: types: Added support for rotation from north usage attributes
>>>>     iio: hid-sensor-magn-3d: Scan for usage attributes before setting up
>>>>       iio channels
>>>>     iio: hid-sensor-magn-3d: Add support for rotation from north
>>>>
>>>>    Documentation/ABI/testing/sysfs-bus-iio       |  82 +++++++++++
>>>>    drivers/iio/industrialio-core.c               |   4 +
>>>>    drivers/iio/magnetometer/hid-sensor-magn-3d.c | 199
>>>> ++++++++++++++++++++------
>>>>    include/linux/iio/types.h                     |   4 +
>>>>    4 files changed, 245 insertions(+), 44 deletions(-)
>>>>
>>> Did you get chance to look at the cause of panic?
>>>
>>> Thanks,
>>> Srinivas
>
>