HID: vivaldi: fix handling devices not using numbered reports

Unfortunately details of USB HID transport bled into HID core and
handling of numbered/unnumbered reports is quite a mess, with
hid_report_len() calculating the length according to USB rules,
and hid_hw_raw_request() adding report ID to the buffer for both
numbered and unnumbered reports.

Untangling it all requres a lot of changes in HID, so for now let's
handle this in the driver.

[jkosina@suse.cz: microoptimize field->report->id to report->id]
Fixes: 14c9c014babe ("HID: add vivaldi HID driver")
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Tested-by: Stephen Boyd <swboyd@chromium.org> # CoachZ
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-vivaldi.c b/drivers/hid/hid-vivaldi.c
index 72957a9..576518e 100644 (file)
--- a/drivers/hid/hid-vivaldi.c
+++ b/drivers/hid/hid-vivaldi.c
@@ -74,10 +74,11 @@ static void vivaldi_feature_mapping(struct hid_device *hdev,
                                    struct hid_usage *usage)
 {
        struct vivaldi_data *drvdata = hid_get_drvdata(hdev);
+       struct hid_report *report = field->report;
        int fn_key;
        int ret;
        u32 report_len;
-       u8 *buf;
+       u8 *report_data, *buf;
 
        if (field->logical != HID_USAGE_FN_ROW_PHYSMAP ||
            (usage->hid & HID_USAGE_PAGE) != HID_UP_ORDINAL)
@@ -89,12 +90,24 @@ static void vivaldi_feature_mapping(struct hid_device *hdev,
        if (fn_key > drvdata->max_function_row_key)
                drvdata->max_function_row_key = fn_key;
 
-       buf = hid_alloc_report_buf(field->report, GFP_KERNEL);
-       if (!buf)
+       report_data = buf = hid_alloc_report_buf(report, GFP_KERNEL);
+       if (!report_data)
                return;
 
-       report_len = hid_report_len(field->report);
-       ret = hid_hw_raw_request(hdev, field->report->id, buf,
+       report_len = hid_report_len(report);
+       if (!report->id) {
+               /*
+                * hid_hw_raw_request() will stuff report ID (which will be 0)
+                * into the first byte of the buffer even for unnumbered
+                * reports, so we need to account for this to avoid getting
+                * -EOVERFLOW in return.
+                * Note that hid_alloc_report_buf() adds 7 bytes to the size
+                * so we can safely say that we have space for an extra byte.
+                */
+               report_len++;
+       }
+
+       ret = hid_hw_raw_request(hdev, report->id, report_data,
                                 report_len, HID_FEATURE_REPORT,
                                 HID_REQ_GET_REPORT);
        if (ret < 0) {
@@ -103,7 +116,16 @@ static void vivaldi_feature_mapping(struct hid_device *hdev,
                goto out;
        }
 
-       ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT, buf,
+       if (!report->id) {
+               /*
+                * Undo the damage from hid_hw_raw_request() for unnumbered
+                * reports.
+                */
+               report_data++;
+               report_len--;
+       }
+
+       ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT, report_data,
                                   report_len, 0);
        if (ret) {
                dev_warn(&hdev->dev, "failed to report feature %d\n",