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>hifive-unleashed-5.1
Samuel Ortiz
John W. Linville
parent
541d920b05
commit
361f3cb7f9
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@ -72,6 +72,7 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
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#define PN533_CMD_IN_LIST_PASSIVE_TARGET 0x4A
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#define PN533_CMD_IN_ATR 0x50
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#define PN533_CMD_IN_RELEASE 0x52
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#define PN533_CMD_IN_JUMP_FOR_DEP 0x56
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#define PN533_CMD_RESPONSE(cmd) (cmd + 1)
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@ -231,6 +232,26 @@ struct pn533_cmd_activate_response {
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u8 gt[];
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} __packed;
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/* PN533_CMD_IN_JUMP_FOR_DEP */
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struct pn533_cmd_jump_dep {
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u8 active;
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u8 baud;
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u8 next;
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u8 gt[];
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} __packed;
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struct pn533_cmd_jump_dep_response {
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u8 status;
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u8 tg;
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u8 nfcid3t[10];
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u8 didt;
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u8 bst;
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u8 brt;
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u8 to;
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u8 ppt;
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/* optional */
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u8 gt[];
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} __packed;
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struct pn533 {
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struct usb_device *udev;
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@ -1244,6 +1265,142 @@ static void pn533_deactivate_target(struct nfc_dev *nfc_dev, u32 target_idx)
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return;
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}
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static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
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u8 *params, int params_len)
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{
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struct pn533_cmd_jump_dep *cmd;
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struct pn533_cmd_jump_dep_response *resp;
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struct nfc_target nfc_target;
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u8 target_gt_len;
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int rc;
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if (params_len == -ENOENT) {
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nfc_dev_dbg(&dev->interface->dev, "");
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return 0;
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}
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if (params_len < 0) {
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nfc_dev_err(&dev->interface->dev,
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"Error %d when bringing DEP link up",
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params_len);
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return 0;
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}
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if (dev->tgt_available_prots &&
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!(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
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nfc_dev_err(&dev->interface->dev,
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"The target does not support DEP");
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return -EINVAL;
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}
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resp = (struct pn533_cmd_jump_dep_response *) params;
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cmd = (struct pn533_cmd_jump_dep *) arg;
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rc = resp->status & PN533_CMD_RET_MASK;
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if (rc != PN533_CMD_RET_SUCCESS) {
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nfc_dev_err(&dev->interface->dev,
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"Bringing DEP link up failed %d", rc);
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return 0;
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}
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if (!dev->tgt_available_prots) {
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nfc_dev_dbg(&dev->interface->dev, "Creating new target");
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nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
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rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
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if (rc)
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return 0;
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dev->tgt_available_prots = 0;
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}
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dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
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/* ATR_RES general bytes are located at offset 17 */
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target_gt_len = PN533_FRAME_CMD_PARAMS_LEN(dev->in_frame) - 17;
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rc = nfc_set_remote_general_bytes(dev->nfc_dev,
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resp->gt, target_gt_len);
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if (rc == 0)
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rc = nfc_dep_link_is_up(dev->nfc_dev,
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dev->nfc_dev->targets[0].idx,
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!cmd->active, NFC_RF_INITIATOR);
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return 0;
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}
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static int pn533_dep_link_up(struct nfc_dev *nfc_dev, int target_idx,
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u8 comm_mode, u8 rf_mode)
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{
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struct pn533 *dev = nfc_get_drvdata(nfc_dev);
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struct pn533_cmd_jump_dep *cmd;
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u8 cmd_len, local_gt_len, *local_gt;
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int rc;
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nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
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if (rf_mode == NFC_RF_TARGET) {
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nfc_dev_err(&dev->interface->dev, "Target mode not supported");
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return -EOPNOTSUPP;
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}
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if (dev->poll_mod_count) {
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nfc_dev_err(&dev->interface->dev,
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"Cannot bring the DEP link up while polling");
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return -EBUSY;
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}
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if (dev->tgt_active_prot) {
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nfc_dev_err(&dev->interface->dev,
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"There is already an active target");
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return -EBUSY;
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}
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local_gt = nfc_get_local_general_bytes(dev->nfc_dev, &local_gt_len);
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if (local_gt_len > NFC_MAX_GT_LEN)
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return -EINVAL;
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cmd_len = sizeof(struct pn533_cmd_jump_dep) + local_gt_len;
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cmd = kzalloc(cmd_len, GFP_KERNEL);
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if (cmd == NULL)
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return -ENOMEM;
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pn533_tx_frame_init(dev->out_frame, PN533_CMD_IN_JUMP_FOR_DEP);
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cmd->active = !comm_mode;
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cmd->baud = 0;
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if (local_gt != NULL) {
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cmd->next = 4; /* We have some Gi */
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memcpy(cmd->gt, local_gt, local_gt_len);
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} else {
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cmd->next = 0;
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}
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memcpy(PN533_FRAME_CMD_PARAMS_PTR(dev->out_frame), cmd, cmd_len);
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dev->out_frame->datalen += cmd_len;
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pn533_tx_frame_finish(dev->out_frame);
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rc = pn533_send_cmd_frame_async(dev, dev->out_frame, dev->in_frame,
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dev->in_maxlen, pn533_in_dep_link_up_complete,
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cmd, GFP_KERNEL);
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if (rc)
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goto out;
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out:
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kfree(cmd);
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return rc;
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}
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static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
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{
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pn533_deactivate_target(nfc_dev, 0);
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return 0;
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}
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#define PN533_CMD_DATAEXCH_HEAD_LEN (sizeof(struct pn533_frame) + 3)
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#define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
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@ -1439,6 +1596,8 @@ static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
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struct nfc_ops pn533_nfc_ops = {
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.dev_up = NULL,
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.dev_down = NULL,
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.dep_link_up = pn533_dep_link_up,
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.dep_link_down = pn533_dep_link_down,
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.start_poll = pn533_start_poll,
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.stop_poll = pn533_stop_poll,
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.activate_target = pn533_activate_target,
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