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-rw-r--r--drivers/hid/usbhid/hid-quirks.c39
1 files changed, 33 insertions, 6 deletions
diff --git a/drivers/hid/usbhid/hid-quirks.c b/drivers/hid/usbhid/hid-quirks.c
index 9287a9e684e5..c4fdccdda858 100644
--- a/drivers/hid/usbhid/hid-quirks.c
+++ b/drivers/hid/usbhid/hid-quirks.c
@@ -447,6 +447,34 @@ static const struct hid_blacklist {
{ 0, 0 }
};
+/**
+* usbhid_exists_squirk: return any static quirks for a USB HID device
+* @idVendor: the 16-bit USB vendor ID, in native byteorder
+* @idProduct: the 16-bit USB product ID, in native byteorder
+*
+* Description:
+* Given a USB vendor ID and product ID, return a pointer to
+* the hid_blacklist entry associated with that device.
+*
+* Returns: pointer if quirk found, or NULL if no quirks found.
+*/
+static const struct hid_blacklist *usbhid_exists_squirk(const u16 idVendor,
+ const u16 idProduct)
+{
+ const struct hid_blacklist *bl_entry = NULL;
+ int n = 0;
+
+ for (; hid_blacklist[n].idVendor; n++)
+ if (hid_blacklist[n].idVendor == idVendor &&
+ hid_blacklist[n].idProduct == idProduct)
+ bl_entry = &hid_blacklist[n];
+
+ if (bl_entry != NULL)
+ dbg("Found squirk 0x%x for USB HID vendor 0x%hx prod 0x%hx\n",
+ bl_entry->quirks, bl_entry->idVendor,
+ bl_entry->idProduct);
+ return bl_entry;
+}
/**
* usbhid_lookup_quirk: return any quirks associated with a USB HID device
@@ -462,7 +490,7 @@ static const struct hid_blacklist {
u32 usbhid_lookup_quirk(const u16 idVendor, const u16 idProduct)
{
u32 quirks = 0;
- int n = 0;
+ const struct hid_blacklist *bl_entry = NULL;
/* Ignore all Wacom devices */
if (idVendor == USB_VENDOR_ID_WACOM)
@@ -474,10 +502,9 @@ u32 usbhid_lookup_quirk(const u16 idVendor, const u16 idProduct)
idProduct <= USB_DEVICE_ID_CODEMERCS_IOW_LAST)
return HID_QUIRK_IGNORE;
- for (; hid_blacklist[n].idVendor; n++)
- if (hid_blacklist[n].idVendor == idVendor &&
- hid_blacklist[n].idProduct == idProduct)
- quirks = hid_blacklist[n].quirks;
-
+ bl_entry = usbhid_exists_squirk(idVendor, idProduct);
+ if (bl_entry)
+ quirks = bl_entry->quirks;
return quirks;
}
+