Commit 361f3cb7 authored by Samuel Ortiz's avatar Samuel Ortiz Committed by John W. Linville

NFC: DEP link hook implementation for pn533

Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 541d920b
......@@ -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,
......
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