.attrs = sysfs_attrs
};
+static void mt_get_feature(struct hid_device *hdev, struct hid_report *report)
+{
+ struct mt_device *td = hid_get_drvdata(hdev);
+ int ret, size = hid_report_len(report);
+ u8 *buf;
+
+ /*
+ * Only fetch the feature report if initial reports are not already
+ * been retrieved. Currently this is only done for Windows 8 touch
+ * devices.
+ */
+ if (!(hdev->quirks & HID_QUIRK_NO_INIT_REPORTS))
+ return;
+ if (td->mtclass.name != MT_CLS_WIN_8)
+ return;
+
+ buf = hid_alloc_report_buf(report, GFP_KERNEL);
+ if (!buf)
+ return;
+
+ ret = hid_hw_raw_request(hdev, report->id, buf, size,
+ HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
+ if (ret < 0) {
+ dev_warn(&hdev->dev, "failed to fetch feature %d\n",
+ report->id);
+ } else {
+ ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT, buf,
+ size, 0);
+ if (ret)
+ dev_warn(&hdev->dev, "failed to report feature\n");
+ }
+
+ kfree(buf);
+}
+
static void mt_feature_mapping(struct hid_device *hdev,
struct hid_field *field, struct hid_usage *usage)
{
break;
case HID_DG_CONTACTMAX:
+ mt_get_feature(hdev, field->report);
+
td->maxcontact_report_id = field->report->id;
td->maxcontacts = field->value[0];
if (!td->maxcontacts &&
break;
}
+ mt_get_feature(hdev, field->report);
if (field->value[usage->usage_index] == MT_BUTTONTYPE_CLICKPAD)
td->is_buttonpad = true;
* reports. Fortunately, the Win8 spec says that all touches
* should be sent during each report, making the initialization
* of input reports unnecessary.
+ *
+ * In addition some touchpads do not behave well if we read
+ * all feature reports from them. Instead we prevent
+ * initial report fetching and then selectively fetch each
+ * report we are interested in.
*/
- hdev->quirks |= HID_QUIRK_NO_INIT_INPUT_REPORTS;
+ hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
td = devm_kzalloc(&hdev->dev, sizeof(struct mt_device), GFP_KERNEL);
if (!td) {