NFC: digital: Add Digital Layer support for ISO/IEC 15693

Add support for ISO/IEC 15693 to the digital layer.  The code
currently uses single-slot anticollision only since the digital
layer infrastructure only supports one tag per adapter (making
it pointless to do 16-slot anticollision).

The code uses two new framing types:
'NFC_DIGITAL_FRAMING_ISO15693_INVENTORY' and
'NFC_DIGITAL_FRAMING_ISO15693_TVT'.  The former is used to
tell the driver to prepare for an Inventory command and the
ensuing anticollision sequence.  The latter is used to tell
the driver that the anticollision sequence is over and to
prepare for non-inventory commands.

Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 109 insertions, 0 deletions

diff --git a/net/nfc/digital_technology.c b/net/nfc/digital_technology.c
index 251c8c753ebe..97d3f602fc06 100644
--- a/net/nfc/digital_technology.c
+++ b/net/nfc/digital_technology.c
@@ -51,6 +51,15 @@
 #define DIGITAL_SENSF_REQ_RC_SC   1
 #define DIGITAL_SENSF_REQ_RC_AP   2
 
+#define DIGITAL_CMD_ISO15693_INVENTORY_REQ	0x01
+
+#define DIGITAL_ISO15693_REQ_FLAG_DATA_RATE	BIT(1)
+#define DIGITAL_ISO15693_REQ_FLAG_INVENTORY	BIT(2)
+#define DIGITAL_ISO15693_REQ_FLAG_NB_SLOTS	BIT(5)
+#define DIGITAL_ISO15693_RES_FLAG_ERROR		BIT(0)
+#define DIGITAL_ISO15693_RES_IS_VALID(flags) \
+	(!((flags) & DIGITAL_ISO15693_RES_FLAG_ERROR))
+
 struct digital_sdd_res {
 	u8 nfcid1[4];
 	u8 bcc;
@@ -82,6 +91,19 @@ struct digital_sensf_res {
 	u8 rd[2];
 } __packed;
 
+struct digital_iso15693_inv_req {
+	u8 flags;
+	u8 cmd;
+	u8 mask_len;
+	u64 mask;
+} __packed;
+
+struct digital_iso15693_inv_res {
+	u8 flags;
+	u8 dsfid;
+	u64 uid;
+} __packed;
+
 static int digital_in_send_sdd_req(struct nfc_digital_dev *ddev,
 				   struct nfc_target *target);
 
@@ -473,6 +495,93 @@ int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech)
 	return rc;
 }
 
+static void digital_in_recv_iso15693_inv_res(struct nfc_digital_dev *ddev,
+		void *arg, struct sk_buff *resp)
+{
+	struct digital_iso15693_inv_res *res;
+	struct nfc_target *target = NULL;
+	int rc;
+
+	if (IS_ERR(resp)) {
+		rc = PTR_ERR(resp);
+		resp = NULL;
+		goto out_free_skb;
+	}
+
+	if (resp->len != sizeof(*res)) {
+		rc = -EIO;
+		goto out_free_skb;
+	}
+
+	res = (struct digital_iso15693_inv_res *)resp->data;
+
+	if (!DIGITAL_ISO15693_RES_IS_VALID(res->flags)) {
+		PROTOCOL_ERR("ISO15693 - 10.3.1");
+		rc = -EINVAL;
+		goto out_free_skb;
+	}
+
+	target = kzalloc(sizeof(*target), GFP_KERNEL);
+	if (!target) {
+		rc = -ENOMEM;
+		goto out_free_skb;
+	}
+
+	target->is_iso15693 = 1;
+	target->iso15693_dsfid = res->dsfid;
+	memcpy(target->iso15693_uid, &res->uid, sizeof(target->iso15693_uid));
+
+	rc = digital_target_found(ddev, target, NFC_PROTO_ISO15693);
+
+	kfree(target);
+
+out_free_skb:
+	dev_kfree_skb(resp);
+
+	if (rc)
+		digital_poll_next_tech(ddev);
+}
+
+int digital_in_send_iso15693_inv_req(struct nfc_digital_dev *ddev, u8 rf_tech)
+{
+	struct digital_iso15693_inv_req *req;
+	struct sk_buff *skb;
+	int rc;
+
+	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
+				     NFC_DIGITAL_RF_TECH_ISO15693);
+	if (rc)
+		return rc;
+
+	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
+				     NFC_DIGITAL_FRAMING_ISO15693_INVENTORY);
+	if (rc)
+		return rc;
+
+	skb = digital_skb_alloc(ddev, sizeof(*req));
+	if (!skb)
+		return -ENOMEM;
+
+	skb_put(skb, sizeof(*req) - sizeof(req->mask)); /* No mask */
+	req = (struct digital_iso15693_inv_req *)skb->data;
+
+	/* Single sub-carrier, high data rate, no AFI, single slot
+	 * Inventory command
+	 */
+	req->flags = DIGITAL_ISO15693_REQ_FLAG_DATA_RATE |
+		     DIGITAL_ISO15693_REQ_FLAG_INVENTORY |
+		     DIGITAL_ISO15693_REQ_FLAG_NB_SLOTS;
+	req->cmd = DIGITAL_CMD_ISO15693_INVENTORY_REQ;
+	req->mask_len = 0;
+
+	rc = digital_in_send_cmd(ddev, skb, 30,
+				 digital_in_recv_iso15693_inv_res, NULL);
+	if (rc)
+		kfree_skb(skb);
+
+	return rc;
+}
+
 static int digital_tg_send_sel_res(struct nfc_digital_dev *ddev)
 {
 	struct sk_buff *skb;