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Diffstat (limited to 'net/nfc/digital_technology.c')
-rw-r--r--net/nfc/digital_technology.c288
1 files changed, 285 insertions, 3 deletions
diff --git a/net/nfc/digital_technology.c b/net/nfc/digital_technology.c
index 084b0fba5f4d..0cad38001c5f 100644
--- a/net/nfc/digital_technology.c
+++ b/net/nfc/digital_technology.c
@@ -26,13 +26,269 @@
#define DIGITAL_SDD_RES_CT 0x88
#define DIGITAL_SDD_RES_LEN 5
+#define DIGITAL_SEL_RES_NFCID1_COMPLETE(sel_res) (!((sel_res) & 0x04))
+#define DIGITAL_SEL_RES_IS_T2T(sel_res) (!((sel_res) & 0x60))
+
+#define DIGITAL_SENS_RES_IS_T1T(sens_res) (((sens_res) & 0x000C) == 0x000C)
+#define DIGITAL_SENS_RES_IS_VALID(sens_res) \
+ ((!((sens_res) & 0x1F00) && (((sens_res) & 0x000C) == 0x000C)) || \
+ (((sens_res) & 0x1F00) && ((sens_res) & 0x000C) != 0x000C))
+
+#define DIGITAL_MIFARE_READ_RES_LEN 16
+#define DIGITAL_MIFARE_ACK_RES 0x0A
+
+struct digital_sdd_res {
+ u8 nfcid1[4];
+ u8 bcc;
+} __packed;
+
+struct digital_sel_req {
+ u8 sel_cmd;
+ u8 b2;
+ u8 nfcid1[4];
+ u8 bcc;
+} __packed;
+
+static int digital_in_send_sdd_req(struct nfc_digital_dev *ddev,
+ struct nfc_target *target);
+
+static void digital_in_recv_sel_res(struct nfc_digital_dev *ddev, void *arg,
+ struct sk_buff *resp)
+{
+ struct nfc_target *target = arg;
+ int rc;
+ u8 sel_res;
+ u8 nfc_proto;
+
+ if (IS_ERR(resp)) {
+ rc = PTR_ERR(resp);
+ resp = NULL;
+ goto exit;
+ }
+
+ if (!DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
+ rc = digital_skb_check_crc_a(resp);
+ if (rc) {
+ PROTOCOL_ERR("4.4.1.3");
+ goto exit;
+ }
+ }
+
+ if (!resp->len) {
+ rc = -EIO;
+ goto exit;
+ }
+
+ sel_res = resp->data[0];
+
+ if (!DIGITAL_SEL_RES_NFCID1_COMPLETE(sel_res)) {
+ rc = digital_in_send_sdd_req(ddev, target);
+ if (rc)
+ goto exit;
+
+ goto exit_free_skb;
+ }
+
+ if (DIGITAL_SEL_RES_IS_T2T(sel_res)) {
+ nfc_proto = NFC_PROTO_MIFARE;
+ } else {
+ rc = -EOPNOTSUPP;
+ goto exit;
+ }
+
+ target->sel_res = sel_res;
+
+ rc = digital_target_found(ddev, target, nfc_proto);
+
+exit:
+ kfree(target);
+
+exit_free_skb:
+ dev_kfree_skb(resp);
+
+ if (rc)
+ digital_poll_next_tech(ddev);
+}
+
+static int digital_in_send_sel_req(struct nfc_digital_dev *ddev,
+ struct nfc_target *target,
+ struct digital_sdd_res *sdd_res)
+{
+ struct sk_buff *skb;
+ struct digital_sel_req *sel_req;
+ u8 sel_cmd;
+ int rc;
+
+ skb = digital_skb_alloc(ddev, sizeof(struct digital_sel_req));
+ if (!skb)
+ return -ENOMEM;
+
+ skb_put(skb, sizeof(struct digital_sel_req));
+ sel_req = (struct digital_sel_req *)skb->data;
+
+ if (target->nfcid1_len <= 4)
+ sel_cmd = DIGITAL_CMD_SEL_REQ_CL1;
+ else if (target->nfcid1_len < 10)
+ sel_cmd = DIGITAL_CMD_SEL_REQ_CL2;
+ else
+ sel_cmd = DIGITAL_CMD_SEL_REQ_CL3;
+
+ sel_req->sel_cmd = sel_cmd;
+ sel_req->b2 = 0x70;
+ memcpy(sel_req->nfcid1, sdd_res->nfcid1, 4);
+ sel_req->bcc = sdd_res->bcc;
+
+ if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
+ rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
+ NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A);
+ if (rc)
+ goto exit;
+ } else {
+ digital_skb_add_crc_a(skb);
+ }
+
+ rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sel_res,
+ target);
+exit:
+ if (rc)
+ kfree_skb(skb);
+
+ return rc;
+}
+
+static void digital_in_recv_sdd_res(struct nfc_digital_dev *ddev, void *arg,
+ struct sk_buff *resp)
+{
+ struct nfc_target *target = arg;
+ struct digital_sdd_res *sdd_res;
+ int rc;
+ u8 offset, size;
+ u8 i, bcc;
+
+ if (IS_ERR(resp)) {
+ rc = PTR_ERR(resp);
+ resp = NULL;
+ goto exit;
+ }
+
+ if (resp->len < DIGITAL_SDD_RES_LEN) {
+ PROTOCOL_ERR("4.7.2.8");
+ rc = -EINVAL;
+ goto exit;
+ }
+
+ sdd_res = (struct digital_sdd_res *)resp->data;
+
+ for (i = 0, bcc = 0; i < 4; i++)
+ bcc ^= sdd_res->nfcid1[i];
+
+ if (bcc != sdd_res->bcc) {
+ PROTOCOL_ERR("4.7.2.6");
+ rc = -EINVAL;
+ goto exit;
+ }
+
+ if (sdd_res->nfcid1[0] == DIGITAL_SDD_RES_CT) {
+ offset = 1;
+ size = 3;
+ } else {
+ offset = 0;
+ size = 4;
+ }
+
+ memcpy(target->nfcid1 + target->nfcid1_len, sdd_res->nfcid1 + offset,
+ size);
+ target->nfcid1_len += size;
+
+ rc = digital_in_send_sel_req(ddev, target, sdd_res);
+
+exit:
+ dev_kfree_skb(resp);
+
+ if (rc) {
+ kfree(target);
+ digital_poll_next_tech(ddev);
+ }
+}
+
+static int digital_in_send_sdd_req(struct nfc_digital_dev *ddev,
+ struct nfc_target *target)
+{
+ int rc;
+ struct sk_buff *skb;
+ u8 sel_cmd;
+
+ rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
+ NFC_DIGITAL_FRAMING_NFCA_STANDARD);
+ if (rc)
+ return rc;
+
+ skb = digital_skb_alloc(ddev, 2);
+ if (!skb) {
+ PR_ERR("alloc_skb failed");
+ return -ENOMEM;
+ }
+
+ if (target->nfcid1_len == 0)
+ sel_cmd = DIGITAL_CMD_SEL_REQ_CL1;
+ else if (target->nfcid1_len == 3)
+ sel_cmd = DIGITAL_CMD_SEL_REQ_CL2;
+ else
+ sel_cmd = DIGITAL_CMD_SEL_REQ_CL3;
+
+ *skb_put(skb, sizeof(u8)) = sel_cmd;
+ *skb_put(skb, sizeof(u8)) = DIGITAL_SDD_REQ_SEL_PAR;
+
+ return digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sdd_res,
+ target);
+}
+
static void digital_in_recv_sens_res(struct nfc_digital_dev *ddev, void *arg,
struct sk_buff *resp)
{
- if (!IS_ERR(resp))
- dev_kfree_skb(resp);
+ struct nfc_target *target = NULL;
+ u16 sens_res;
+ int rc;
+
+ if (IS_ERR(resp)) {
+ rc = PTR_ERR(resp);
+ resp = NULL;
+ goto exit;
+ }
+
+ if (resp->len < sizeof(u16)) {
+ rc = -EIO;
+ goto exit;
+ }
+
+ target = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
+ if (!target) {
+ rc = -ENOMEM;
+ goto exit;
+ }
+
+ memcpy(&target->sens_res, resp->data, sizeof(u16));
- digital_poll_next_tech(ddev);
+ sens_res = be16_to_cpu(target->sens_res);
+
+ if (!DIGITAL_SENS_RES_IS_VALID(sens_res)) {
+ PROTOCOL_ERR("4.6.3.3");
+ rc = -EINVAL;
+ goto exit;
+ }
+
+ if (DIGITAL_SENS_RES_IS_T1T(sens_res))
+ rc = digital_target_found(ddev, target, NFC_PROTO_JEWEL);
+ else
+ rc = digital_in_send_sdd_req(ddev, target);
+
+exit:
+ dev_kfree_skb(resp);
+
+ if (rc) {
+ kfree(target);
+ digital_poll_next_tech(ddev);
+ }
}
int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech)
@@ -62,3 +318,29 @@ int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech)
return rc;
}
+
+int digital_in_recv_mifare_res(struct sk_buff *resp)
+{
+ /* Successful READ command response is 16 data bytes + 2 CRC bytes long.
+ * Since the driver can't differentiate a ACK/NACK response from a valid
+ * READ response, the CRC calculation must be handled at digital level
+ * even if the driver supports it for this technology.
+ */
+ if (resp->len == DIGITAL_MIFARE_READ_RES_LEN + DIGITAL_CRC_LEN) {
+ if (digital_skb_check_crc_a(resp)) {
+ PROTOCOL_ERR("9.4.1.2");
+ return -EIO;
+ }
+
+ return 0;
+ }
+
+ /* ACK response (i.e. successful WRITE). */
+ if (resp->len == 1 && resp->data[0] == DIGITAL_MIFARE_ACK_RES) {
+ resp->data[0] = 0;
+ return 0;
+ }
+
+ /* NACK and any other responses are treated as error. */
+ return -EIO;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-15 01:10:29 +0000