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author | Ilan Elias <ilane@ti.com> | 2011-09-18 08:19:35 (GMT) |
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committer | John W. Linville <linville@tuxdriver.com> | 2011-09-20 18:43:49 (GMT) |
commit | 6a2968aaf50c7a22fced77a5e24aa636281efca8 (patch) | |
tree | c3c9691da86f90d1eb13ee75e36189faad553496 /net/nfc/nci/rsp.c | |
parent | 55eb94f9e923cba376cdf48ea5ab28d81116bead (diff) | |
download | linux-fsl-qoriq-6a2968aaf50c7a22fced77a5e24aa636281efca8.tar.xz |
NFC: basic NCI protocol implementation
The NFC Controller Interface (NCI) is a standard
communication protocol between an NFC Controller (NFCC)
and a Device Host (DH), defined by the NFC Forum.
Signed-off-by: Ilan Elias <ilane@ti.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/nfc/nci/rsp.c')
-rw-r--r-- | net/nfc/nci/rsp.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/net/nfc/nci/rsp.c b/net/nfc/nci/rsp.c new file mode 100644 index 0000000..0403d4c --- /dev/null +++ b/net/nfc/nci/rsp.c @@ -0,0 +1,226 @@ +/* + * The NFC Controller Interface is the communication protocol between an + * NFC Controller (NFCC) and a Device Host (DH). + * + * Copyright (C) 2011 Texas Instruments, Inc. + * + * Written by Ilan Elias <ilane@ti.com> + * + * Acknowledgements: + * This file is based on hci_event.c, which was written + * by Maxim Krasnyansky. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/types.h> +#include <linux/interrupt.h> +#include <linux/bitops.h> +#include <linux/skbuff.h> + +#include "../nfc.h" +#include <net/nfc/nci.h> +#include <net/nfc/nci_core.h> + +/* Handle NCI Response packets */ + +static void nci_core_reset_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) +{ + struct nci_core_reset_rsp *rsp = (void *) skb->data; + + nfc_dbg("entry, status 0x%x", rsp->status); + + if (rsp->status == NCI_STATUS_OK) + ndev->nci_ver = rsp->nci_ver; + + nfc_dbg("nci_ver 0x%x", ndev->nci_ver); + + nci_req_complete(ndev, rsp->status); +} + +static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) +{ + struct nci_core_init_rsp_1 *rsp_1 = (void *) skb->data; + struct nci_core_init_rsp_2 *rsp_2; + + nfc_dbg("entry, status 0x%x", rsp_1->status); + + if (rsp_1->status != NCI_STATUS_OK) + return; + + ndev->nfcc_features = __le32_to_cpu(rsp_1->nfcc_features); + ndev->num_supported_rf_interfaces = rsp_1->num_supported_rf_interfaces; + + if (ndev->num_supported_rf_interfaces > + NCI_MAX_SUPPORTED_RF_INTERFACES) { + ndev->num_supported_rf_interfaces = + NCI_MAX_SUPPORTED_RF_INTERFACES; + } + + memcpy(ndev->supported_rf_interfaces, + rsp_1->supported_rf_interfaces, + ndev->num_supported_rf_interfaces); + + rsp_2 = (void *) (skb->data + 6 + ndev->num_supported_rf_interfaces); + + ndev->max_logical_connections = + rsp_2->max_logical_connections; + ndev->max_routing_table_size = + __le16_to_cpu(rsp_2->max_routing_table_size); + ndev->max_control_packet_payload_length = + rsp_2->max_control_packet_payload_length; + ndev->rf_sending_buffer_size = + __le16_to_cpu(rsp_2->rf_sending_buffer_size); + ndev->rf_receiving_buffer_size = + __le16_to_cpu(rsp_2->rf_receiving_buffer_size); + ndev->manufacturer_id = + __le16_to_cpu(rsp_2->manufacturer_id); + + nfc_dbg("nfcc_features 0x%x", + ndev->nfcc_features); + nfc_dbg("num_supported_rf_interfaces %d", + ndev->num_supported_rf_interfaces); + nfc_dbg("supported_rf_interfaces[0] 0x%x", + ndev->supported_rf_interfaces[0]); + nfc_dbg("supported_rf_interfaces[1] 0x%x", + ndev->supported_rf_interfaces[1]); + nfc_dbg("supported_rf_interfaces[2] 0x%x", + ndev->supported_rf_interfaces[2]); + nfc_dbg("supported_rf_interfaces[3] 0x%x", + ndev->supported_rf_interfaces[3]); + nfc_dbg("max_logical_connections %d", + ndev->max_logical_connections); + nfc_dbg("max_routing_table_size %d", + ndev->max_routing_table_size); + nfc_dbg("max_control_packet_payload_length %d", + ndev->max_control_packet_payload_length); + nfc_dbg("rf_sending_buffer_size %d", + ndev->rf_sending_buffer_size); + nfc_dbg("rf_receiving_buffer_size %d", + ndev->rf_receiving_buffer_size); + nfc_dbg("manufacturer_id 0x%x", + ndev->manufacturer_id); + + nci_req_complete(ndev, rsp_1->status); +} + +static void nci_core_conn_create_rsp_packet(struct nci_dev *ndev, + struct sk_buff *skb) +{ + struct nci_core_conn_create_rsp *rsp = (void *) skb->data; + + nfc_dbg("entry, status 0x%x", rsp->status); + + if (rsp->status != NCI_STATUS_OK) + return; + + ndev->max_pkt_payload_size = rsp->max_pkt_payload_size; + ndev->initial_num_credits = rsp->initial_num_credits; + ndev->conn_id = rsp->conn_id; + + atomic_set(&ndev->credits_cnt, ndev->initial_num_credits); + + nfc_dbg("max_pkt_payload_size %d", ndev->max_pkt_payload_size); + nfc_dbg("initial_num_credits %d", ndev->initial_num_credits); + nfc_dbg("conn_id %d", ndev->conn_id); +} + +static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev, + struct sk_buff *skb) +{ + __u8 status = skb->data[0]; + + nfc_dbg("entry, status 0x%x", status); + + nci_req_complete(ndev, status); +} + +static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) +{ + __u8 status = skb->data[0]; + + nfc_dbg("entry, status 0x%x", status); + + if (status == NCI_STATUS_OK) + set_bit(NCI_DISCOVERY, &ndev->flags); + + nci_req_complete(ndev, status); +} + +static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev, + struct sk_buff *skb) +{ + __u8 status = skb->data[0]; + + nfc_dbg("entry, status 0x%x", status); + + clear_bit(NCI_DISCOVERY, &ndev->flags); + + nci_req_complete(ndev, status); +} + +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); + + nfc_dbg("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d", + 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_CONN_CREATE_RSP: + nci_core_conn_create_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_DEACTIVATE_RSP: + nci_rf_deactivate_rsp_packet(ndev, skb); + break; + + default: + nfc_err("unknown rsp opcode 0x%x", 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); +} |