static void nci_cmd_work(struct work_struct *work)
{
struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
struct sk_buff *skb;
pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
/* Send queued command */
if (atomic_read(&ndev->cmd_cnt)) {
skb = skb_dequeue(&ndev->cmd_q);
if (!skb)
return;
atomic_dec(&ndev->cmd_cnt);
pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
nci_pbf(skb->data),
nci_opcode_gid(nci_opcode(skb->data)),
nci_opcode_oid(nci_opcode(skb->data)),
nci_plen(skb->data));
nci_send_frame(skb);
mod_timer(&ndev->cmd_timer,
jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
}
}
void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
__u16 ntf_opcode = nci_opcode(skb->data);
nfc_dbg("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d",
nci_pbf(skb->data),
nci_opcode_gid(ntf_opcode),
nci_opcode_oid(ntf_opcode),
nci_plen(skb->data));
/* strip the nci control header */
skb_pull(skb, NCI_CTRL_HDR_SIZE);
switch (ntf_opcode) {
case NCI_OP_CORE_CONN_CREDITS_NTF:
nci_core_conn_credits_ntf_packet(ndev, skb);
break;
case NCI_OP_RF_INTF_ACTIVATED_NTF:
nci_rf_intf_activated_ntf_packet(ndev, skb);
break;
case NCI_OP_RF_DEACTIVATE_NTF:
nci_rf_deactivate_ntf_packet(ndev, skb);
break;
default:
nfc_err("unknown ntf opcode 0x%x", ntf_opcode);
break;
}
kfree_skb(skb);
}
static void nci_tx_work(struct work_struct *work)
{
struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
struct sk_buff *skb;
pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt));
/* Send queued tx data */
while (atomic_read(&ndev->credits_cnt)) {
skb = skb_dequeue(&ndev->tx_q);
if (!skb)
return;
/* Check if data flow control is used */
if (atomic_read(&ndev->credits_cnt) !=
NCI_DATA_FLOW_CONTROL_NOT_USED)
atomic_dec(&ndev->credits_cnt);
pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
nci_pbf(skb->data),
nci_conn_id(skb->data),
nci_plen(skb->data));
nci_send_frame(skb);
mod_timer(&ndev->data_timer,
jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
}
}
/* Rx Data packet */
void nci_rx_data_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
__u8 pbf = nci_pbf(skb->data);
__u8 status = 0;
__u8 conn_id = nci_conn_id(skb->data);
struct nci_conn_info *conn_info;
pr_debug("len %d\n", skb->len);
pr_debug("NCI RX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
nci_pbf(skb->data),
nci_conn_id(skb->data),
nci_plen(skb->data));
conn_info = nci_get_conn_info_by_conn_id(ndev, nci_conn_id(skb->data));
if (!conn_info)
return;
/* strip the nci data header */
skb_pull(skb, NCI_DATA_HDR_SIZE);
if (ndev->target_active_prot == NFC_PROTO_MIFARE ||
ndev->target_active_prot == NFC_PROTO_JEWEL ||
ndev->target_active_prot == NFC_PROTO_FELICA ||
ndev->target_active_prot == NFC_PROTO_ISO15693) {
/* frame I/F => remove the status byte */
pr_debug("frame I/F => remove the status byte\n");
status = skb->data[skb->len - 1];
skb_trim(skb, (skb->len - 1));
}
nci_add_rx_data_frag(ndev, skb, pbf, conn_id, nci_to_errno(status));
}
/* -- Default recv_buf handler --
*
* This handler supposes that NCI frames are sent over UART link without any
* framing. It reads NCI header, retrieve the packet size and once all packet
* bytes are received it passes it to nci_uart driver for processing.
*/
static int nci_uart_default_recv_buf(struct nci_uart *nu, const u8 *data,
char *flags, int count)
{
int chunk_len;
if (!nu->ndev) {
nfc_err(nu->tty->dev,
"receive data from tty but no NCI dev is attached yet, drop buffer\n");
return 0;
}
/* Decode all incoming data in packets
* and enqueue then for processing.
*/
while (count > 0) {
/* If this is the first data of a packet, allocate a buffer */
if (!nu->rx_skb) {
nu->rx_packet_len = -1;
nu->rx_skb = nci_skb_alloc(nu->ndev,
NCI_MAX_PACKET_SIZE,
GFP_KERNEL);
if (!nu->rx_skb)
return -ENOMEM;
}
/* Eat byte after byte till full packet header is received */
if (nu->rx_skb->len < NCI_CTRL_HDR_SIZE) {
*skb_put(nu->rx_skb, 1) = *data++;
--count;
continue;
}
/* Header was received but packet len was not read */
if (nu->rx_packet_len < 0)
nu->rx_packet_len = NCI_CTRL_HDR_SIZE +
nci_plen(nu->rx_skb->data);
/* Compute how many bytes are missing and how many bytes can
* be consumed.
*/
chunk_len = nu->rx_packet_len - nu->rx_skb->len;
if (count < chunk_len)
chunk_len = count;
memcpy(skb_put(nu->rx_skb, chunk_len), data, chunk_len);
data += chunk_len;
count -= chunk_len;
/* Chcek if packet is fully received */
if (nu->rx_packet_len == nu->rx_skb->len) {
/* Pass RX packet to driver */
if (nu->ops.recv(nu, nu->rx_skb) != 0)
nfc_err(nu->tty->dev, "corrupted RX packet\n");
/* Next packet will be a new one */
nu->rx_skb = NULL;
}
}
return 0;
}
void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
__u16 rsp_opcode = nci_opcode(skb->data);
/* we got a rsp, stop the cmd timer */
del_timer(&ndev->cmd_timer);
pr_debug("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
nci_pbf(skb->data),
nci_opcode_gid(rsp_opcode),
nci_opcode_oid(rsp_opcode),
nci_plen(skb->data));
/* strip the nci control header */
skb_pull(skb, NCI_CTRL_HDR_SIZE);
switch (rsp_opcode) {
case NCI_OP_CORE_RESET_RSP:
nci_core_reset_rsp_packet(ndev, skb);
break;
case NCI_OP_CORE_INIT_RSP:
nci_core_init_rsp_packet(ndev, skb);
break;
case NCI_OP_CORE_SET_CONFIG_RSP:
nci_core_set_config_rsp_packet(ndev, skb);
break;
case NCI_OP_RF_DISCOVER_MAP_RSP:
nci_rf_disc_map_rsp_packet(ndev, skb);
break;
case NCI_OP_RF_DISCOVER_RSP:
nci_rf_disc_rsp_packet(ndev, skb);
break;
case NCI_OP_RF_DISCOVER_SELECT_RSP:
nci_rf_disc_select_rsp_packet(ndev, skb);
break;
case NCI_OP_RF_DEACTIVATE_RSP:
nci_rf_deactivate_rsp_packet(ndev, skb);
break;
default:
pr_err("unknown rsp opcode 0x%x\n", rsp_opcode);
break;
}
kfree_skb(skb);
/* trigger the next cmd */
atomic_set(&ndev->cmd_cnt, 1);
if (!skb_queue_empty(&ndev->cmd_q))
queue_work(ndev->cmd_wq, &ndev->cmd_work);
}
void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
__u16 ntf_opcode = nci_opcode(skb->data);
pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
nci_pbf(skb->data),
nci_opcode_gid(ntf_opcode),
nci_opcode_oid(ntf_opcode),
nci_plen(skb->data));
skb_pull(skb, NCI_CTRL_HDR_SIZE);
switch (ntf_opcode) {
case NCI_OP_CORE_CONN_CREDITS_NTF:
nci_core_conn_credits_ntf_packet(ndev, skb);
break;
case NCI_OP_CORE_GENERIC_ERROR_NTF:
nci_core_generic_error_ntf_packet(ndev, skb);
break;
case NCI_OP_CORE_INTF_ERROR_NTF:
nci_core_conn_intf_error_ntf_packet(ndev, skb);
break;
case NCI_OP_RF_DISCOVER_NTF:
nci_rf_discover_ntf_packet(ndev, skb);
break;
case NCI_OP_RF_INTF_ACTIVATED_NTF:
nci_rf_intf_activated_ntf_packet(ndev, skb);
break;
case NCI_OP_RF_DEACTIVATE_NTF:
nci_rf_deactivate_ntf_packet(ndev, skb);
break;
default:
pr_err("unknown ntf opcode 0x%x\n", ntf_opcode);
break;
}
kfree_skb(skb);
}
/* Rx Data packet */
void nci_rx_data_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
__u8 pbf = nci_pbf(skb->data);
nfc_dbg("entry, len %d", skb->len);
nfc_dbg("NCI RX: MT=data, PBF=%d, conn_id=%d, plen=%d",
nci_pbf(skb->data),
nci_conn_id(skb->data),
nci_plen(skb->data));
/* strip the nci data header */
skb_pull(skb, NCI_DATA_HDR_SIZE);
if (ndev->target_active_prot == NFC_PROTO_MIFARE) {
/* frame I/F => remove the status byte */
nfc_dbg("NFC_PROTO_MIFARE => remove the status byte");
skb_trim(skb, (skb->len - 1));
}
nci_add_rx_data_frag(ndev, skb, pbf);
}
void nci_rx_data_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
__u8 pbf = nci_pbf(skb->data);
pr_debug("len %d\n", skb->len);
pr_debug("NCI RX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
nci_pbf(skb->data),
nci_conn_id(skb->data),
nci_plen(skb->data));
/* */
skb_pull(skb, NCI_DATA_HDR_SIZE);
if (ndev->target_active_prot == NFC_PROTO_MIFARE) {
/* */
pr_debug("NFC_PROTO_MIFARE => remove the status byte\n");
skb_trim(skb, (skb->len - 1));
}
nci_add_rx_data_frag(ndev, skb, pbf);
}
static void nci_tx_work(struct work_struct *work)
{
struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
struct sk_buff *skb;
nfc_dbg("entry, credits_cnt %d", atomic_read(&ndev->credits_cnt));
/* Send queued tx data */
while (atomic_read(&ndev->credits_cnt)) {
skb = skb_dequeue(&ndev->tx_q);
if (!skb)
return;
atomic_dec(&ndev->credits_cnt);
nfc_dbg("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d",
nci_pbf(skb->data),
nci_conn_id(skb->data),
nci_plen(skb->data));
nci_send_frame(skb);
}
}