NFC: DEP link hook implementation for pn533
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
index dccd965..b8b6c2a 100644
--- a/drivers/nfc/pn533.c
+++ b/drivers/nfc/pn533.c
@@ -72,6 +72,7 @@
#define PN533_CMD_IN_LIST_PASSIVE_TARGET 0x4A
#define PN533_CMD_IN_ATR 0x50
#define PN533_CMD_IN_RELEASE 0x52
+#define PN533_CMD_IN_JUMP_FOR_DEP 0x56
#define PN533_CMD_RESPONSE(cmd) (cmd + 1)
@@ -231,6 +232,26 @@
u8 gt[];
} __packed;
+/* PN533_CMD_IN_JUMP_FOR_DEP */
+struct pn533_cmd_jump_dep {
+ u8 active;
+ u8 baud;
+ u8 next;
+ u8 gt[];
+} __packed;
+
+struct pn533_cmd_jump_dep_response {
+ u8 status;
+ u8 tg;
+ u8 nfcid3t[10];
+ u8 didt;
+ u8 bst;
+ u8 brt;
+ u8 to;
+ u8 ppt;
+ /* optional */
+ u8 gt[];
+} __packed;
struct pn533 {
struct usb_device *udev;
@@ -1244,6 +1265,142 @@
return;
}
+
+static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
+ u8 *params, int params_len)
+{
+ struct pn533_cmd_jump_dep *cmd;
+ struct pn533_cmd_jump_dep_response *resp;
+ struct nfc_target nfc_target;
+ u8 target_gt_len;
+ int rc;
+
+ if (params_len == -ENOENT) {
+ nfc_dev_dbg(&dev->interface->dev, "");
+ return 0;
+ }
+
+ if (params_len < 0) {
+ nfc_dev_err(&dev->interface->dev,
+ "Error %d when bringing DEP link up",
+ params_len);
+ return 0;
+ }
+
+ if (dev->tgt_available_prots &&
+ !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
+ nfc_dev_err(&dev->interface->dev,
+ "The target does not support DEP");
+ return -EINVAL;
+ }
+
+ resp = (struct pn533_cmd_jump_dep_response *) params;
+ cmd = (struct pn533_cmd_jump_dep *) arg;
+ rc = resp->status & PN533_CMD_RET_MASK;
+ if (rc != PN533_CMD_RET_SUCCESS) {
+ nfc_dev_err(&dev->interface->dev,
+ "Bringing DEP link up failed %d", rc);
+ return 0;
+ }
+
+ if (!dev->tgt_available_prots) {
+ nfc_dev_dbg(&dev->interface->dev, "Creating new target");
+
+ nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
+ rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
+ if (rc)
+ return 0;
+
+ dev->tgt_available_prots = 0;
+ }
+
+ dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
+
+ /* ATR_RES general bytes are located at offset 17 */
+ target_gt_len = PN533_FRAME_CMD_PARAMS_LEN(dev->in_frame) - 17;
+ rc = nfc_set_remote_general_bytes(dev->nfc_dev,
+ resp->gt, target_gt_len);
+ if (rc == 0)
+ rc = nfc_dep_link_is_up(dev->nfc_dev,
+ dev->nfc_dev->targets[0].idx,
+ !cmd->active, NFC_RF_INITIATOR);
+
+ return 0;
+}
+
+static int pn533_dep_link_up(struct nfc_dev *nfc_dev, int target_idx,
+ u8 comm_mode, u8 rf_mode)
+{
+ struct pn533 *dev = nfc_get_drvdata(nfc_dev);
+ struct pn533_cmd_jump_dep *cmd;
+ u8 cmd_len, local_gt_len, *local_gt;
+ int rc;
+
+ nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+ if (rf_mode == NFC_RF_TARGET) {
+ nfc_dev_err(&dev->interface->dev, "Target mode not supported");
+ return -EOPNOTSUPP;
+ }
+
+
+ if (dev->poll_mod_count) {
+ nfc_dev_err(&dev->interface->dev,
+ "Cannot bring the DEP link up while polling");
+ return -EBUSY;
+ }
+
+ if (dev->tgt_active_prot) {
+ nfc_dev_err(&dev->interface->dev,
+ "There is already an active target");
+ return -EBUSY;
+ }
+
+ local_gt = nfc_get_local_general_bytes(dev->nfc_dev, &local_gt_len);
+ if (local_gt_len > NFC_MAX_GT_LEN)
+ return -EINVAL;
+
+ cmd_len = sizeof(struct pn533_cmd_jump_dep) + local_gt_len;
+ cmd = kzalloc(cmd_len, GFP_KERNEL);
+ if (cmd == NULL)
+ return -ENOMEM;
+
+ pn533_tx_frame_init(dev->out_frame, PN533_CMD_IN_JUMP_FOR_DEP);
+
+ cmd->active = !comm_mode;
+ cmd->baud = 0;
+ if (local_gt != NULL) {
+ cmd->next = 4; /* We have some Gi */
+ memcpy(cmd->gt, local_gt, local_gt_len);
+ } else {
+ cmd->next = 0;
+ }
+
+ memcpy(PN533_FRAME_CMD_PARAMS_PTR(dev->out_frame), cmd, cmd_len);
+ dev->out_frame->datalen += cmd_len;
+
+ pn533_tx_frame_finish(dev->out_frame);
+
+ rc = pn533_send_cmd_frame_async(dev, dev->out_frame, dev->in_frame,
+ dev->in_maxlen, pn533_in_dep_link_up_complete,
+ cmd, GFP_KERNEL);
+ if (rc)
+ goto out;
+
+
+out:
+ kfree(cmd);
+
+ return rc;
+}
+
+static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
+{
+ pn533_deactivate_target(nfc_dev, 0);
+
+ return 0;
+}
+
#define PN533_CMD_DATAEXCH_HEAD_LEN (sizeof(struct pn533_frame) + 3)
#define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
@@ -1439,6 +1596,8 @@
struct nfc_ops pn533_nfc_ops = {
.dev_up = NULL,
.dev_down = NULL,
+ .dep_link_up = pn533_dep_link_up,
+ .dep_link_down = pn533_dep_link_down,
.start_poll = pn533_start_poll,
.stop_poll = pn533_stop_poll,
.activate_target = pn533_activate_target,