[PATCH 1/3] nfc: st-nci: map proprietary RF 0x90 to MIFARE

[Tim auf der Landwehr <tadl-git@taufderl.de>]

The ST21NFCD reports MIFARE Classic under the proprietary RF protocol
number 0x90 (observed on a MIFARE Classic 4K). st_nci_get_rfprotocol only
mapped 0x83 (ISO 15693), so nci_add_new_protocol dropped the tag with
"the target found does not have the desired protocol" and userspace never
saw the card.

Map 0x90 to NFC_PROTO_MIFARE_MASK. NFC_PROTO_MIFARE_MASK is already in the
driver's supported-protocols set.

Signed-off-by: Tim auf der Landwehr <tadl-git@taufderl.de>
---
 drivers/nfc/st-nci/core.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/nfc/st-nci/core.c b/drivers/nfc/st-nci/core.c
index d7802434a..3ba49d696 100644
--- a/drivers/nfc/st-nci/core.c
+++ b/drivers/nfc/st-nci/core.c
@@ -15,6 +15,11 @@
 #define DRIVER_DESC "NCI NFC driver for ST_NCI"
 
 #define ST_NCI1_X_PROPRIETARY_ISO15693 0x83
+/* Proprietary RF protocol the controller reports for MIFARE Classic (observed:
+ * 0x90 on a MIFARE Classic 4K). Not an NFC Forum protocol, so it must be
+ * mapped here or nci_add_new_protocol drops the tag.
+ */
+#define ST_NCI1_X_PROPRIETARY_MIFARE 0x90
 
 static int st_nci_init(struct nci_dev *ndev)
 {
@@ -76,8 +81,14 @@ static int st_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
 static __u32 st_nci_get_rfprotocol(struct nci_dev *ndev,
 					 __u8 rf_protocol)
 {
-	return rf_protocol == ST_NCI1_X_PROPRIETARY_ISO15693 ?
-		NFC_PROTO_ISO15693_MASK : 0;
+	switch (rf_protocol) {
+	case ST_NCI1_X_PROPRIETARY_ISO15693:
+		return NFC_PROTO_ISO15693_MASK;
+	case ST_NCI1_X_PROPRIETARY_MIFARE:
+		return NFC_PROTO_MIFARE_MASK;
+	default:
+		return 0;
+	}
 }
 
 static int st_nci_prop_rsp_packet(struct nci_dev *ndev,
-- 
2.55.0