Some hid sensor feature report can contain more than one reports.
This API can now support receiving multiple values from the feature
report.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
---
drivers/hid/hid-sensor-hub.c | 16 ++++++++++++++--
include/linux/hid-sensor-hub.h | 8 +++++---
2 files changed, 19 insertions(+), 5 deletions(-)
diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c
index e54ce10..0ad5813 100644
--- a/drivers/hid/hid-sensor-hub.c
+++ b/drivers/hid/hid-sensor-hub.c
@@ -232,10 +232,11 @@ done_proc:
EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
- u32 field_index, s32 *value)
+ u32 field_index, int buffer_size, void *buffer)
{
struct hid_report *report;
struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
+ int report_size;
int ret = 0;
mutex_lock(&data->mutex);
@@ -247,7 +248,18 @@ int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
}
hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
hid_hw_wait(hsdev->hdev);
- *value = report->field[field_index]->value[0];
+
+ /* calculate number of bytes required to read this field */
+ report_size = report->field[field_index]->report_size / 8;
+ if (report->field[field_index]->report_size % 8)
+ ++report_size;
+ report_size *= report->field[field_index]->report_count;
+ if (!report_size) {
+ ret = -EINVAL;
+ goto done_proc;
+ }
+ ret = min(report_size, buffer_size);
+ memcpy(buffer, report->field[field_index]->value, ret);
done_proc:
mutex_unlock(&data->mutex);
diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-sensor-hub.h
index 4173a8f..dfdf6ef 100644
--- a/include/linux/hid-sensor-hub.h
+++ b/include/linux/hid-sensor-hub.h
@@ -179,13 +179,15 @@ int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
* @hsdev: Hub device instance.
* @report_id: Report id to look for
* @field_index: Field index inside a report
-* @value: Place holder for return value
+* @buffer_size: size of the buffer
+* @buffer: buffer to copy output
*
* Used to get a field in feature report. For example this can get polling
-* interval, sensitivity, activate/deactivate state.
+* interval, sensitivity, activate/deactivate state. On success it returns
+* number of bytes copied to buffer. On failure, it returns value < 0.
*/
int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
- u32 field_index, s32 *value);
+ u32 field_index, int buffer_size, void *buffer);
/* hid-sensor-attributes */
--
1.9.1
--
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