diff options
| -rw-r--r-- | drivers/nfc/pn533.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c index dccd96552f5d..b8b6c2abbd4a 100644 --- a/drivers/nfc/pn533.c +++ b/drivers/nfc/pn533.c @@ -72,6 +72,7 @@ MODULE_DEVICE_TABLE(usb, pn533_table); #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 @@ struct pn533_cmd_activate_response { 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 @@ static void pn533_deactivate_target(struct nfc_dev *nfc_dev, u32 target_idx) 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 @@ static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata, 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, |