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linux/net/nfc/nci/rsp.c
Bongsu Jeon bcd684aace net/nfc/nci: Support NCI 2.x initial sequence 
implement the NCI 2.x initial sequence to support NCI 2.x NFCC.
Since NCI 2.0, CORE_RESET and CORE_INIT sequence have been changed.
If NFCEE supports NCI 2.x, then NCI 2.x initial sequence will work.

In NCI 1.0, Initial sequence and payloads are as below:
(DH)                     (NFCC)
 |  -- CORE_RESET_CMD --> |
 |  <-- CORE_RESET_RSP -- |
 |  -- CORE_INIT_CMD -->  |
 |  <-- CORE_INIT_RSP --  |
 CORE_RESET_RSP payloads are Status, NCI version, Configuration Status.
 CORE_INIT_CMD payloads are empty.
 CORE_INIT_RSP payloads are Status, NFCC Features,
    Number of Supported RF Interfaces, Supported RF Interface,
    Max Logical Connections, Max Routing table Size,
    Max Control Packet Payload Size, Max Size for Large Parameters,
    Manufacturer ID, Manufacturer Specific Information.

In NCI 2.0, Initial Sequence and Parameters are as below:
(DH)                     (NFCC)
 |  -- CORE_RESET_CMD --> |
 |  <-- CORE_RESET_RSP -- |
 |  <-- CORE_RESET_NTF -- |
 |  -- CORE_INIT_CMD -->  |
 |  <-- CORE_INIT_RSP --  |
 CORE_RESET_RSP payloads are Status.
 CORE_RESET_NTF payloads are Reset Trigger,
    Configuration Status, NCI Version, Manufacturer ID,
    Manufacturer Specific Information Length,
    Manufacturer Specific Information.
 CORE_INIT_CMD payloads are Feature1, Feature2.
 CORE_INIT_RSP payloads are Status, NFCC Features,
    Max Logical Connections, Max Routing Table Size,
    Max Control Packet Payload Size,
    Max Data Packet Payload Size of the Static HCI Connection,
    Number of Credits of the Static HCI Connection,
    Max NFC-V RF Frame Size, Number of Supported RF Interfaces,
    Supported RF Interfaces.

Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
Link: https://lore.kernel.org/r/20201202223147.3472-1-bongsu.jeon@samsung.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-12-04 17:47:35 -08:00

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11 KiB
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// SPDX-License-Identifier: GPL-2.0-only
/*
* 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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
#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;
pr_debug("status 0x%x\n", rsp->status);
/* Handle NCI 1.x ver */
if (skb->len != 1) {
if (rsp->status == NCI_STATUS_OK) {
ndev->nci_ver = rsp->nci_ver;
pr_debug("nci_ver 0x%x, config_status 0x%x\n",
rsp->nci_ver, rsp->config_status);
}
nci_req_complete(ndev, rsp->status);
}
}
static u8 nci_core_init_rsp_packet_v1(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;
pr_debug("status 0x%x\n", rsp_1->status);
if (rsp_1->status != NCI_STATUS_OK)
return rsp_1->status;
ndev->nfcc_features = __le32_to_cpu(rsp_1->nfcc_features);
ndev->num_supported_rf_interfaces = rsp_1->num_supported_rf_interfaces;
ndev->num_supported_rf_interfaces =
min((int)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 + rsp_1->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_ctrl_pkt_payload_len =
rsp_2->max_ctrl_pkt_payload_len;
ndev->max_size_for_large_params =
__le16_to_cpu(rsp_2->max_size_for_large_params);
ndev->manufact_id =
rsp_2->manufact_id;
ndev->manufact_specific_info =
__le32_to_cpu(rsp_2->manufact_specific_info);
return NCI_STATUS_OK;
}
static u8 nci_core_init_rsp_packet_v2(struct nci_dev *ndev, struct sk_buff *skb)
{
struct nci_core_init_rsp_nci_ver2 *rsp = (void *)skb->data;
u8 *supported_rf_interface = rsp->supported_rf_interfaces;
u8 rf_interface_idx = 0;
u8 rf_extension_cnt = 0;
pr_debug("status %x\n", rsp->status);
if (rsp->status != NCI_STATUS_OK)
return rsp->status;
ndev->nfcc_features = __le32_to_cpu(rsp->nfcc_features);
ndev->num_supported_rf_interfaces = rsp->num_supported_rf_interfaces;
ndev->num_supported_rf_interfaces =
min((int)ndev->num_supported_rf_interfaces,
NCI_MAX_SUPPORTED_RF_INTERFACES);
while (rf_interface_idx < ndev->num_supported_rf_interfaces) {
ndev->supported_rf_interfaces[rf_interface_idx++] = *supported_rf_interface++;
/* skip rf extension parameters */
rf_extension_cnt = *supported_rf_interface++;
supported_rf_interface += rf_extension_cnt;
}
ndev->max_logical_connections = rsp->max_logical_connections;
ndev->max_routing_table_size =
__le16_to_cpu(rsp->max_routing_table_size);
ndev->max_ctrl_pkt_payload_len =
rsp->max_ctrl_pkt_payload_len;
ndev->max_size_for_large_params = NCI_MAX_LARGE_PARAMS_NCI_v2;
return NCI_STATUS_OK;
}
static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
u8 status = 0;
if (!(ndev->nci_ver & NCI_VER_2_MASK))
status = nci_core_init_rsp_packet_v1(ndev, skb);
else
status = nci_core_init_rsp_packet_v2(ndev, skb);
if (status != NCI_STATUS_OK)
goto exit;
pr_debug("nfcc_features 0x%x\n",
ndev->nfcc_features);
pr_debug("num_supported_rf_interfaces %d\n",
ndev->num_supported_rf_interfaces);
pr_debug("supported_rf_interfaces[0] 0x%x\n",
ndev->supported_rf_interfaces[0]);
pr_debug("supported_rf_interfaces[1] 0x%x\n",
ndev->supported_rf_interfaces[1]);
pr_debug("supported_rf_interfaces[2] 0x%x\n",
ndev->supported_rf_interfaces[2]);
pr_debug("supported_rf_interfaces[3] 0x%x\n",
ndev->supported_rf_interfaces[3]);
pr_debug("max_logical_connections %d\n",
ndev->max_logical_connections);
pr_debug("max_routing_table_size %d\n",
ndev->max_routing_table_size);
pr_debug("max_ctrl_pkt_payload_len %d\n",
ndev->max_ctrl_pkt_payload_len);
pr_debug("max_size_for_large_params %d\n",
ndev->max_size_for_large_params);
pr_debug("manufact_id 0x%x\n",
ndev->manufact_id);
pr_debug("manufact_specific_info 0x%x\n",
ndev->manufact_specific_info);
exit:
nci_req_complete(ndev, status);
}
static void nci_core_set_config_rsp_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
struct nci_core_set_config_rsp *rsp = (void *) skb->data;
pr_debug("status 0x%x\n", rsp->status);
nci_req_complete(ndev, rsp->status);
}
static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
__u8 status = skb->data[0];
pr_debug("status 0x%x\n", status);
nci_req_complete(ndev, status);
}
static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
struct nci_conn_info *conn_info;
__u8 status = skb->data[0];
pr_debug("status 0x%x\n", status);
if (status == NCI_STATUS_OK) {
atomic_set(&ndev->state, NCI_DISCOVERY);
conn_info = ndev->rf_conn_info;
if (!conn_info) {
conn_info = devm_kzalloc(&ndev->nfc_dev->dev,
sizeof(struct nci_conn_info),
GFP_KERNEL);
if (!conn_info) {
status = NCI_STATUS_REJECTED;
goto exit;
}
conn_info->conn_id = NCI_STATIC_RF_CONN_ID;
INIT_LIST_HEAD(&conn_info->list);
list_add(&conn_info->list, &ndev->conn_info_list);
ndev->rf_conn_info = conn_info;
}
}
exit:
nci_req_complete(ndev, status);
}
static void nci_rf_disc_select_rsp_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
__u8 status = skb->data[0];
pr_debug("status 0x%x\n", status);
/* Complete the request on intf_activated_ntf or generic_error_ntf */
if (status != NCI_STATUS_OK)
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];
pr_debug("status 0x%x\n", status);
/* If target was active, complete the request only in deactivate_ntf */
if ((status != NCI_STATUS_OK) ||
(atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
nci_clear_target_list(ndev);
atomic_set(&ndev->state, NCI_IDLE);
nci_req_complete(ndev, status);
}
}
static void nci_nfcee_discover_rsp_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
struct nci_nfcee_discover_rsp *discover_rsp;
if (skb->len != 2) {
nci_req_complete(ndev, NCI_STATUS_NFCEE_PROTOCOL_ERROR);
return;
}
discover_rsp = (struct nci_nfcee_discover_rsp *)skb->data;
if (discover_rsp->status != NCI_STATUS_OK ||
discover_rsp->num_nfcee == 0)
nci_req_complete(ndev, discover_rsp->status);
}
static void nci_nfcee_mode_set_rsp_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
__u8 status = skb->data[0];
pr_debug("status 0x%x\n", status);
nci_req_complete(ndev, status);
}
static void nci_core_conn_create_rsp_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
__u8 status = skb->data[0];
struct nci_conn_info *conn_info = NULL;
struct nci_core_conn_create_rsp *rsp;
pr_debug("status 0x%x\n", status);
if (status == NCI_STATUS_OK) {
rsp = (struct nci_core_conn_create_rsp *)skb->data;
conn_info = devm_kzalloc(&ndev->nfc_dev->dev,
sizeof(*conn_info), GFP_KERNEL);
if (!conn_info) {
status = NCI_STATUS_REJECTED;
goto exit;
}
conn_info->dest_params = devm_kzalloc(&ndev->nfc_dev->dev,
sizeof(struct dest_spec_params),
GFP_KERNEL);
if (!conn_info->dest_params) {
status = NCI_STATUS_REJECTED;
goto free_conn_info;
}
conn_info->dest_type = ndev->cur_dest_type;
conn_info->dest_params->id = ndev->cur_params.id;
conn_info->dest_params->protocol = ndev->cur_params.protocol;
conn_info->conn_id = rsp->conn_id;
/* Note: data_exchange_cb and data_exchange_cb_context need to
* be specify out of nci_core_conn_create_rsp_packet
*/
INIT_LIST_HEAD(&conn_info->list);
list_add(&conn_info->list, &ndev->conn_info_list);
if (ndev->cur_params.id == ndev->hci_dev->nfcee_id)
ndev->hci_dev->conn_info = conn_info;
conn_info->conn_id = rsp->conn_id;
conn_info->max_pkt_payload_len = rsp->max_ctrl_pkt_payload_len;
atomic_set(&conn_info->credits_cnt, rsp->credits_cnt);
}
free_conn_info:
if (status == NCI_STATUS_REJECTED)
devm_kfree(&ndev->nfc_dev->dev, conn_info);
exit:
nci_req_complete(ndev, status);
}
static void nci_core_conn_close_rsp_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
struct nci_conn_info *conn_info;
__u8 status = skb->data[0];
pr_debug("status 0x%x\n", status);
if (status == NCI_STATUS_OK) {
conn_info = nci_get_conn_info_by_conn_id(ndev,
ndev->cur_conn_id);
if (conn_info) {
list_del(&conn_info->list);
devm_kfree(&ndev->nfc_dev->dev, conn_info);
}
}
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);
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);
if (nci_opcode_gid(rsp_opcode) == NCI_GID_PROPRIETARY) {
if (nci_prop_rsp_packet(ndev, rsp_opcode, skb) == -ENOTSUPP) {
pr_err("unsupported rsp opcode 0x%x\n",
rsp_opcode);
}
goto end;
}
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_CORE_CONN_CREATE_RSP:
nci_core_conn_create_rsp_packet(ndev, skb);
break;
case NCI_OP_CORE_CONN_CLOSE_RSP:
nci_core_conn_close_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;
case NCI_OP_NFCEE_DISCOVER_RSP:
nci_nfcee_discover_rsp_packet(ndev, skb);
break;
case NCI_OP_NFCEE_MODE_SET_RSP:
nci_nfcee_mode_set_rsp_packet(ndev, skb);
break;
default:
pr_err("unknown rsp opcode 0x%x\n", rsp_opcode);
break;
}
nci_core_rsp_packet(ndev, rsp_opcode, skb);
end:
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);
}
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