[PATCH net-next v2] net/nfc/nci: Support NCI 2.x initial sequence

From: Bongsu Jeon
Date: Mon Nov 23 2020 - 05:12:19 EST

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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@xxxxxxxxxxx>
---
Changes in v2:
- fix the warning of type casting.
- changed the __u8 type to unsigned char.

include/net/nfc/nci.h | 39 ++++++++++++++++++++++
net/nfc/nci/core.c | 23 +++++++++++--
net/nfc/nci/ntf.c | 21 ++++++++++++
net/nfc/nci/rsp.c | 75 +++++++++++++++++++++++++++++++++++++------
4 files changed, 146 insertions(+), 12 deletions(-)

diff --git a/include/net/nfc/nci.h b/include/net/nfc/nci.h
index 0550e0380b8d..decc89803d4b 100644
--- a/include/net/nfc/nci.h
+++ b/include/net/nfc/nci.h
@@ -25,6 +25,8 @@
#define NCI_MAX_PARAM_LEN 251
#define NCI_MAX_PAYLOAD_SIZE 255
#define NCI_MAX_PACKET_SIZE 258
+#define NCI_MAX_LARGE_PARAMS_NCI_v2 15
+#define NCI_VER_2_MASK 0x20

/* NCI Status Codes */
#define NCI_STATUS_OK 0x00
@@ -131,6 +133,9 @@
#define NCI_LF_CON_BITR_F_212 0x02
#define NCI_LF_CON_BITR_F_424 0x04

+/* NCI 2.x Feature Enable Bit */
+#define NCI_FEATURE_DISABLE 0x00
+
/* NCI Reset types */
#define NCI_RESET_TYPE_KEEP_CONFIG 0x00
#define NCI_RESET_TYPE_RESET_CONFIG 0x01
@@ -220,6 +225,11 @@ struct nci_core_reset_cmd {
} __packed;

#define NCI_OP_CORE_INIT_CMD nci_opcode_pack(NCI_GID_CORE, 0x01)
+/* To support NCI 2.x */
+struct nci_core_init_v2_cmd {
+ unsigned char feature1;
+ unsigned char feature2;
+} __packed;

#define NCI_OP_CORE_SET_CONFIG_CMD nci_opcode_pack(NCI_GID_CORE, 0x02)
struct set_config_param {
@@ -316,6 +326,11 @@ struct nci_core_reset_rsp {
__u8 config_status;
} __packed;

+/* To support NCI ver 2.x */
+struct nci_core_reset_rsp_nci_ver2 {
+ unsigned char status;
+} __packed;
+
#define NCI_OP_CORE_INIT_RSP nci_opcode_pack(NCI_GID_CORE, 0x01)
struct nci_core_init_rsp_1 {
__u8 status;
@@ -334,6 +349,20 @@ struct nci_core_init_rsp_2 {
__le32 manufact_specific_info;
} __packed;

+/* To support NCI ver 2.x */
+struct nci_core_init_rsp_nci_ver2 {
+ unsigned char status;
+ __le32 nfcc_features;
+ unsigned char max_logical_connections;
+ __le16 max_routing_table_size;
+ unsigned char max_ctrl_pkt_payload_len;
+ unsigned char max_data_pkt_hci_payload_len;
+ unsigned char number_of_hci_credit;
+ __le16 max_nfc_v_frame_size;
+ unsigned char num_supported_rf_interfaces;
+ unsigned char supported_rf_interfaces[];
+} __packed;
+
#define NCI_OP_CORE_SET_CONFIG_RSP nci_opcode_pack(NCI_GID_CORE, 0x02)
struct nci_core_set_config_rsp {
__u8 status;
@@ -372,6 +401,16 @@ struct nci_nfcee_discover_rsp {
/* --------------------------- */
/* ---- NCI Notifications ---- */
/* --------------------------- */
+#define NCI_OP_CORE_RESET_NTF nci_opcode_pack(NCI_GID_CORE, 0x00)
+struct nci_core_reset_ntf {
+ unsigned char reset_trigger;
+ unsigned char config_status;
+ unsigned char nci_ver;
+ unsigned char manufact_id;
+ unsigned char manufacturer_specific_len;
+ __le32 manufact_specific_info;
+} __packed;
+
#define NCI_OP_CORE_CONN_CREDITS_NTF nci_opcode_pack(NCI_GID_CORE, 0x06)
struct conn_credit_entry {
__u8 conn_id;
diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 4953ee5146e1..68889faadda2 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -165,7 +165,14 @@ static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)

static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
{
- nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
+ struct nci_core_init_v2_cmd *cmd = (struct nci_core_init_v2_cmd *)opt;
+
+ if (!cmd) {
+ nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
+ } else {
+ /* if nci version is 2.0, then use the feature parameters */
+ nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, sizeof(struct nci_core_init_v2_cmd), cmd);
+ }
}

static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
@@ -497,8 +504,18 @@ static int nci_open_device(struct nci_dev *ndev)
}

if (!rc) {
- rc = __nci_request(ndev, nci_init_req, 0,
- msecs_to_jiffies(NCI_INIT_TIMEOUT));
+ if (!(ndev->nci_ver & NCI_VER_2_MASK)) {
+ rc = __nci_request(ndev, nci_init_req, 0,
+ msecs_to_jiffies(NCI_INIT_TIMEOUT));
+ } else {
+ struct nci_core_init_v2_cmd nci_init_v2_cmd;
+
+ nci_init_v2_cmd.feature1 = NCI_FEATURE_DISABLE;
+ nci_init_v2_cmd.feature2 = NCI_FEATURE_DISABLE;
+
+ rc = __nci_request(ndev, nci_init_req, (unsigned long)&nci_init_v2_cmd,
+ msecs_to_jiffies(NCI_INIT_TIMEOUT));
+ }
}

if (!rc && ndev->ops->post_setup)
diff --git a/net/nfc/nci/ntf.c b/net/nfc/nci/ntf.c
index 33e1170817f0..98af04c86b2c 100644
--- a/net/nfc/nci/ntf.c
+++ b/net/nfc/nci/ntf.c
@@ -27,6 +27,23 @@

/* Handle NCI Notification packets */

+static void nci_core_reset_ntf_packet(struct nci_dev *ndev,
+ struct sk_buff *skb)
+{
+ /* Handle NCI 2.x core reset notification */
+ struct nci_core_reset_ntf *ntf = (void *)skb->data;
+
+ ndev->nci_ver = ntf->nci_ver;
+ pr_debug("nci_ver 0x%x, config_status 0x%x\n",
+ ntf->nci_ver, ntf->config_status);
+
+ ndev->manufact_id = ntf->manufact_id;
+ ndev->manufact_specific_info =
+ __le32_to_cpu(ntf->manufact_specific_info);
+
+ nci_req_complete(ndev, NCI_STATUS_OK);
+}
+
static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
@@ -756,6 +773,10 @@ void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
}

switch (ntf_opcode) {
+ case NCI_OP_CORE_RESET_NTF:
+ nci_core_reset_ntf_packet(ndev, skb);
+ break;
+
case NCI_OP_CORE_CONN_CREDITS_NTF:
nci_core_conn_credits_ntf_packet(ndev, skb);
break;
diff --git a/net/nfc/nci/rsp.c b/net/nfc/nci/rsp.c
index a48297b79f34..521fa0383d48 100644
--- a/net/nfc/nci/rsp.c
+++ b/net/nfc/nci/rsp.c
@@ -31,16 +31,19 @@ static void nci_core_reset_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)

pr_debug("status 0x%x\n", rsp->status);

- 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);
- }
+ /* 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);
+ nci_req_complete(ndev, rsp->status);
+ }
}

-static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
+static unsigned char 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;
@@ -48,7 +51,7 @@ static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
pr_debug("status 0x%x\n", rsp_1->status);

if (rsp_1->status != NCI_STATUS_OK)
- goto exit;
+ 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;
@@ -77,6 +80,60 @@ static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
ndev->manufact_specific_info =
__le32_to_cpu(rsp_2->manufact_specific_info);

+ return NCI_STATUS_OK;
+}
+
+static unsigned char 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;
+ unsigned char rf_interface_idx = 0;
+ unsigned char rf_extension_cnt = 0;
+ unsigned char *supported_rf_interface = rsp->supported_rf_interfaces;
+
+ 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;
+
+ if (ndev->num_supported_rf_interfaces >
+ NCI_MAX_SUPPORTED_RF_INTERFACES) {
+ 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)
+{
+ unsigned char 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",
@@ -103,7 +160,7 @@ static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
ndev->manufact_specific_info);

exit:
- nci_req_complete(ndev, rsp_1->status);
+ nci_req_complete(ndev, status);
}

static void nci_core_set_config_rsp_packet(struct nci_dev *ndev,
--
2.17.1

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