HID: fixup quirk for NCR devices

NCR devices are terminally broken by design -- they claim themselves to contain
proper input applications in their HID report descriptor, but behave very badly
if treated in standard way.

According to NCR developers, the devices get confused when queried for reports
in a standard way, rendering them unusable.

NCR is shipping application called "RPSL" that can be used to drive these
devices through hiddev, under the assumption that in-kernel driver doesn't
perform initial report query.
If it does, neither in-kernel nor hiddev-based driver can operate with these
devices any more.

Introduce a quirk that skips the report query for all NCR devices. The previous
NOGET quirk was wrong and had been introduced because I misunderstood the nature
of brokenness of these devices.

Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 3f56e9c..0258289 100644 (file)
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -996,7 +996,8 @@ static int usbhid_start(struct hid_device *hid)
        usbhid->urbctrl->transfer_dma = usbhid->ctrlbuf_dma;
        usbhid->urbctrl->transfer_flags |= (URB_NO_TRANSFER_DMA_MAP | URB_NO_SETUP_DMA_MAP);
 
-       usbhid_init_reports(hid);
+       if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS))
+               usbhid_init_reports(hid);
 
        set_bit(HID_STARTED, &usbhid->iofl);
 

diff --git a/drivers/hid/usbhid/hid-quirks.c b/drivers/hid/usbhid/hid-quirks.c
index 2d445b2..c3b02f5 100644 (file)
--- a/drivers/hid/usbhid/hid-quirks.c
+++ b/drivers/hid/usbhid/hid-quirks.c
@@ -281,7 +281,7 @@ u32 usbhid_lookup_quirk(const u16 idVendor, const u16 idProduct)
        if (idVendor == USB_VENDOR_ID_NCR &&
                        idProduct >= USB_DEVICE_ID_NCR_FIRST &&
                        idProduct <= USB_DEVICE_ID_NCR_LAST)
-                       return HID_QUIRK_NOGET;
+                       return HID_QUIRK_NO_INIT_REPORTS;
 
        down_read(&dquirks_rwsem);
        bl_entry = usbhid_exists_dquirk(idVendor, idProduct);

diff --git a/include/linux/hid.h b/include/linux/hid.h
index 10f6284..8709365 100644 (file)
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -312,6 +312,7 @@ struct hid_item {
 #define HID_QUIRK_MULTI_INPUT                  0x00000040
 #define HID_QUIRK_SKIP_OUTPUT_REPORTS          0x00010000
 #define HID_QUIRK_FULLSPEED_INTERVAL           0x10000000
+#define HID_QUIRK_NO_INIT_REPORTS              0x20000000
 
 /*
  * This is the global environment of the parser. This information is