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authorJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-11 10:41:07 +0300
committerJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-13 08:17:18 +0300
commite09b41010ba33a20a87472ee821fa407a5b8da36 (patch)
treed10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/net/nfc/nci
parentf93b97fd65072de626c074dbe099a1fff05ce060 (diff)
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page. During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/net/nfc/nci')
-rw-r--r--kernel/net/nfc/nci/Kconfig9
-rw-r--r--kernel/net/nfc/nci/Makefile6
-rw-r--r--kernel/net/nfc/nci/core.c217
-rw-r--r--kernel/net/nfc/nci/data.c13
-rw-r--r--kernel/net/nfc/nci/hci.c176
-rw-r--r--kernel/net/nfc/nci/ntf.c11
-rw-r--r--kernel/net/nfc/nci/rsp.c11
-rw-r--r--kernel/net/nfc/nci/spi.c11
-rw-r--r--kernel/net/nfc/nci/uart.c494
9 files changed, 891 insertions, 57 deletions
diff --git a/kernel/net/nfc/nci/Kconfig b/kernel/net/nfc/nci/Kconfig
index a4f1e42e3..85d4819ab 100644
--- a/kernel/net/nfc/nci/Kconfig
+++ b/kernel/net/nfc/nci/Kconfig
@@ -12,10 +12,17 @@ config NFC_NCI
config NFC_NCI_SPI
depends on NFC_NCI && SPI
select CRC_CCITT
- bool "NCI over SPI protocol support"
+ tristate "NCI over SPI protocol support"
default n
help
NCI (NFC Controller Interface) is a communication protocol between
an NFC Controller (NFCC) and a Device Host (DH).
Say yes if you use an NCI driver that requires SPI link layer.
+
+config NFC_NCI_UART
+ depends on NFC_NCI && TTY
+ tristate "NCI over UART protocol support"
+ default n
+ help
+ Say yes if you use an NCI driver that requires UART link layer.
diff --git a/kernel/net/nfc/nci/Makefile b/kernel/net/nfc/nci/Makefile
index 7ed894926..0ca31d9bf 100644
--- a/kernel/net/nfc/nci/Makefile
+++ b/kernel/net/nfc/nci/Makefile
@@ -6,4 +6,8 @@ obj-$(CONFIG_NFC_NCI) += nci.o
nci-objs := core.o data.o lib.o ntf.o rsp.o hci.o
-nci-$(CONFIG_NFC_NCI_SPI) += spi.o
+nci_spi-y += spi.o
+obj-$(CONFIG_NFC_NCI_SPI) += nci_spi.o
+
+nci_uart-y += uart.o
+obj-$(CONFIG_NFC_NCI_UART) += nci_uart.o
diff --git a/kernel/net/nfc/nci/core.c b/kernel/net/nfc/nci/core.c
index 49ff32106..10c99a578 100644
--- a/kernel/net/nfc/nci/core.c
+++ b/kernel/net/nfc/nci/core.c
@@ -28,6 +28,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
#include <linux/module.h>
+#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#include <linux/completion.h>
@@ -63,6 +64,19 @@ struct nci_conn_info *nci_get_conn_info_by_conn_id(struct nci_dev *ndev,
return NULL;
}
+int nci_get_conn_info_by_id(struct nci_dev *ndev, u8 id)
+{
+ struct nci_conn_info *conn_info;
+
+ list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
+ if (conn_info->id == id)
+ return conn_info->conn_id;
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL(nci_get_conn_info_by_id);
+
/* ---- NCI requests ---- */
void nci_req_complete(struct nci_dev *ndev, int result)
@@ -73,6 +87,7 @@ void nci_req_complete(struct nci_dev *ndev, int result)
complete(&ndev->req_completion);
}
}
+EXPORT_SYMBOL(nci_req_complete);
static void nci_req_cancel(struct nci_dev *ndev, int err)
{
@@ -323,6 +338,60 @@ static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
sizeof(struct nci_rf_deactivate_cmd), &cmd);
}
+struct nci_cmd_param {
+ __u16 opcode;
+ size_t len;
+ __u8 *payload;
+};
+
+static void nci_generic_req(struct nci_dev *ndev, unsigned long opt)
+{
+ struct nci_cmd_param *param =
+ (struct nci_cmd_param *)opt;
+
+ nci_send_cmd(ndev, param->opcode, param->len, param->payload);
+}
+
+int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len, __u8 *payload)
+{
+ struct nci_cmd_param param;
+
+ param.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY, oid);
+ param.len = len;
+ param.payload = payload;
+
+ return __nci_request(ndev, nci_generic_req, (unsigned long)&param,
+ msecs_to_jiffies(NCI_CMD_TIMEOUT));
+}
+EXPORT_SYMBOL(nci_prop_cmd);
+
+int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len, __u8 *payload)
+{
+ struct nci_cmd_param param;
+
+ param.opcode = opcode;
+ param.len = len;
+ param.payload = payload;
+
+ return __nci_request(ndev, nci_generic_req, (unsigned long)&param,
+ msecs_to_jiffies(NCI_CMD_TIMEOUT));
+}
+EXPORT_SYMBOL(nci_core_cmd);
+
+int nci_core_reset(struct nci_dev *ndev)
+{
+ return __nci_request(ndev, nci_reset_req, 0,
+ msecs_to_jiffies(NCI_RESET_TIMEOUT));
+}
+EXPORT_SYMBOL(nci_core_reset);
+
+int nci_core_init(struct nci_dev *ndev)
+{
+ return __nci_request(ndev, nci_init_req, 0,
+ msecs_to_jiffies(NCI_INIT_TIMEOUT));
+}
+EXPORT_SYMBOL(nci_core_init);
+
static int nci_open_device(struct nci_dev *ndev)
{
int rc = 0;
@@ -343,17 +412,26 @@ static int nci_open_device(struct nci_dev *ndev)
set_bit(NCI_INIT, &ndev->flags);
- rc = __nci_request(ndev, nci_reset_req, 0,
- msecs_to_jiffies(NCI_RESET_TIMEOUT));
+ if (ndev->ops->init)
+ rc = ndev->ops->init(ndev);
+
+ if (!rc) {
+ rc = __nci_request(ndev, nci_reset_req, 0,
+ msecs_to_jiffies(NCI_RESET_TIMEOUT));
+ }
- if (ndev->ops->setup)
- ndev->ops->setup(ndev);
+ if (!rc && ndev->ops->setup) {
+ rc = ndev->ops->setup(ndev);
+ }
if (!rc) {
rc = __nci_request(ndev, nci_init_req, 0,
msecs_to_jiffies(NCI_INIT_TIMEOUT));
}
+ if (!rc && ndev->ops->post_setup)
+ rc = ndev->ops->post_setup(ndev);
+
if (!rc) {
rc = __nci_request(ndev, nci_init_complete_req, 0,
msecs_to_jiffies(NCI_INIT_TIMEOUT));
@@ -407,6 +485,12 @@ static int nci_close_device(struct nci_dev *ndev)
set_bit(NCI_INIT, &ndev->flags);
__nci_request(ndev, nci_reset_req, 0,
msecs_to_jiffies(NCI_RESET_TIMEOUT));
+
+ /* After this point our queues are empty
+ * and no works are scheduled.
+ */
+ ndev->ops->close(ndev);
+
clear_bit(NCI_INIT, &ndev->flags);
del_timer_sync(&ndev->cmd_timer);
@@ -414,10 +498,6 @@ static int nci_close_device(struct nci_dev *ndev)
/* Flush cmd wq */
flush_workqueue(ndev->cmd_wq);
- /* After this point our queues are empty
- * and no works are scheduled. */
- ndev->ops->close(ndev);
-
/* Clear flags */
ndev->flags = 0;
@@ -486,7 +566,7 @@ static void nci_nfcee_discover_req(struct nci_dev *ndev, unsigned long opt)
int nci_nfcee_discover(struct nci_dev *ndev, u8 action)
{
- return nci_request(ndev, nci_nfcee_discover_req, action,
+ return __nci_request(ndev, nci_nfcee_discover_req, action,
msecs_to_jiffies(NCI_CMD_TIMEOUT));
}
EXPORT_SYMBOL(nci_nfcee_discover);
@@ -507,8 +587,9 @@ int nci_nfcee_mode_set(struct nci_dev *ndev, u8 nfcee_id, u8 nfcee_mode)
cmd.nfcee_id = nfcee_id;
cmd.nfcee_mode = nfcee_mode;
- return nci_request(ndev, nci_nfcee_mode_set_req, (unsigned long)&cmd,
- msecs_to_jiffies(NCI_CMD_TIMEOUT));
+ return __nci_request(ndev, nci_nfcee_mode_set_req,
+ (unsigned long)&cmd,
+ msecs_to_jiffies(NCI_CMD_TIMEOUT));
}
EXPORT_SYMBOL(nci_nfcee_mode_set);
@@ -534,12 +615,19 @@ int nci_core_conn_create(struct nci_dev *ndev, u8 destination_type,
if (!cmd)
return -ENOMEM;
+ if (!number_destination_params)
+ return -EINVAL;
+
cmd->destination_type = destination_type;
cmd->number_destination_params = number_destination_params;
memcpy(cmd->params, params, params_len);
data.cmd = cmd;
- ndev->cur_id = params->value[DEST_SPEC_PARAMS_ID_INDEX];
+
+ if (params->length > 0)
+ ndev->cur_id = params->value[DEST_SPEC_PARAMS_ID_INDEX];
+ else
+ ndev->cur_id = 0;
r = __nci_request(ndev, nci_core_conn_create_req,
(unsigned long)&data,
@@ -558,8 +646,8 @@ static void nci_core_conn_close_req(struct nci_dev *ndev, unsigned long opt)
int nci_core_conn_close(struct nci_dev *ndev, u8 conn_id)
{
- return nci_request(ndev, nci_core_conn_close_req, conn_id,
- msecs_to_jiffies(NCI_CMD_TIMEOUT));
+ return __nci_request(ndev, nci_core_conn_close_req, conn_id,
+ msecs_to_jiffies(NCI_CMD_TIMEOUT));
}
EXPORT_SYMBOL(nci_core_conn_close);
@@ -747,9 +835,11 @@ static int nci_activate_target(struct nfc_dev *nfc_dev,
}
static void nci_deactivate_target(struct nfc_dev *nfc_dev,
- struct nfc_target *target)
+ struct nfc_target *target,
+ __u8 mode)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
+ u8 nci_mode = NCI_DEACTIVATE_TYPE_IDLE_MODE;
pr_debug("entry\n");
@@ -760,9 +850,14 @@ static void nci_deactivate_target(struct nfc_dev *nfc_dev,
ndev->target_active_prot = 0;
+ switch (mode) {
+ case NFC_TARGET_MODE_SLEEP:
+ nci_mode = NCI_DEACTIVATE_TYPE_SLEEP_MODE;
+ break;
+ }
+
if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
- nci_request(ndev, nci_rf_deactivate_req,
- NCI_DEACTIVATE_TYPE_SLEEP_MODE,
+ nci_request(ndev, nci_rf_deactivate_req, nci_mode,
msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
}
}
@@ -796,7 +891,7 @@ static int nci_dep_link_down(struct nfc_dev *nfc_dev)
pr_debug("entry\n");
if (nfc_dev->rf_mode == NFC_RF_INITIATOR) {
- nci_deactivate_target(nfc_dev, NULL);
+ nci_deactivate_target(nfc_dev, NULL, NCI_DEACTIVATE_TYPE_IDLE_MODE);
} else {
if (atomic_read(&ndev->state) == NCI_LISTEN_ACTIVE ||
atomic_read(&ndev->state) == NCI_DISCOVERY) {
@@ -961,6 +1056,14 @@ struct nci_dev *nci_allocate_device(struct nci_ops *ops,
return NULL;
ndev->ops = ops;
+
+ if (ops->n_prop_ops > NCI_MAX_PROPRIETARY_CMD) {
+ pr_err("Too many proprietary commands: %zd\n",
+ ops->n_prop_ops);
+ ops->prop_ops = NULL;
+ ops->n_prop_ops = 0;
+ }
+
ndev->tx_headroom = tx_headroom;
ndev->tx_tailroom = tx_tailroom;
init_completion(&ndev->req_completion);
@@ -1115,7 +1218,7 @@ int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
}
EXPORT_SYMBOL(nci_recv_frame);
-static int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
+int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
{
pr_debug("len %d\n", skb->len);
@@ -1133,6 +1236,7 @@ static int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
return ndev->ops->send(ndev, skb);
}
+EXPORT_SYMBOL(nci_send_frame);
/* Send NCI command */
int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
@@ -1164,6 +1268,81 @@ int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
return 0;
}
+EXPORT_SYMBOL(nci_send_cmd);
+
+/* Proprietary commands API */
+static struct nci_driver_ops *ops_cmd_lookup(struct nci_driver_ops *ops,
+ size_t n_ops,
+ __u16 opcode)
+{
+ size_t i;
+ struct nci_driver_ops *op;
+
+ if (!ops || !n_ops)
+ return NULL;
+
+ for (i = 0; i < n_ops; i++) {
+ op = &ops[i];
+ if (op->opcode == opcode)
+ return op;
+ }
+
+ return NULL;
+}
+
+static int nci_op_rsp_packet(struct nci_dev *ndev, __u16 rsp_opcode,
+ struct sk_buff *skb, struct nci_driver_ops *ops,
+ size_t n_ops)
+{
+ struct nci_driver_ops *op;
+
+ op = ops_cmd_lookup(ops, n_ops, rsp_opcode);
+ if (!op || !op->rsp)
+ return -ENOTSUPP;
+
+ return op->rsp(ndev, skb);
+}
+
+static int nci_op_ntf_packet(struct nci_dev *ndev, __u16 ntf_opcode,
+ struct sk_buff *skb, struct nci_driver_ops *ops,
+ size_t n_ops)
+{
+ struct nci_driver_ops *op;
+
+ op = ops_cmd_lookup(ops, n_ops, ntf_opcode);
+ if (!op || !op->ntf)
+ return -ENOTSUPP;
+
+ return op->ntf(ndev, skb);
+}
+
+int nci_prop_rsp_packet(struct nci_dev *ndev, __u16 opcode,
+ struct sk_buff *skb)
+{
+ return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->prop_ops,
+ ndev->ops->n_prop_ops);
+}
+
+int nci_prop_ntf_packet(struct nci_dev *ndev, __u16 opcode,
+ struct sk_buff *skb)
+{
+ return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->prop_ops,
+ ndev->ops->n_prop_ops);
+}
+
+int nci_core_rsp_packet(struct nci_dev *ndev, __u16 opcode,
+ struct sk_buff *skb)
+{
+ return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->core_ops,
+ ndev->ops->n_core_ops);
+}
+
+int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
+ struct sk_buff *skb)
+{
+ return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->core_ops,
+ ndev->ops->n_core_ops);
+}
/* ---- NCI TX Data worker thread ---- */
diff --git a/kernel/net/nfc/nci/data.c b/kernel/net/nfc/nci/data.c
index 566466d90..dbd242544 100644
--- a/kernel/net/nfc/nci/data.c
+++ b/kernel/net/nfc/nci/data.c
@@ -90,6 +90,18 @@ static inline void nci_push_data_hdr(struct nci_dev *ndev,
nci_pbf_set((__u8 *)hdr, pbf);
}
+int nci_conn_max_data_pkt_payload_size(struct nci_dev *ndev, __u8 conn_id)
+{
+ struct nci_conn_info *conn_info;
+
+ conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id);
+ if (!conn_info)
+ return -EPROTO;
+
+ return conn_info->max_pkt_payload_len;
+}
+EXPORT_SYMBOL(nci_conn_max_data_pkt_payload_size);
+
static int nci_queue_tx_data_frags(struct nci_dev *ndev,
__u8 conn_id,
struct sk_buff *skb) {
@@ -203,6 +215,7 @@ free_exit:
exit:
return rc;
}
+EXPORT_SYMBOL(nci_send_data);
/* ----------------- NCI RX Data ----------------- */
diff --git a/kernel/net/nfc/nci/hci.c b/kernel/net/nfc/nci/hci.c
index b33fed6d1..2aedac15c 100644
--- a/kernel/net/nfc/nci/hci.c
+++ b/kernel/net/nfc/nci/hci.c
@@ -70,6 +70,7 @@ struct nci_hcp_packet {
#define NCI_HCI_ANY_SET_PARAMETER 0x01
#define NCI_HCI_ANY_GET_PARAMETER 0x02
#define NCI_HCI_ANY_CLOSE_PIPE 0x04
+#define NCI_HCI_ADM_CLEAR_ALL_PIPE 0x14
#define NCI_HFP_NO_CHAINING 0x80
@@ -78,6 +79,8 @@ struct nci_hcp_packet {
#define NCI_EVT_HOT_PLUG 0x03
#define NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY 0x01
+#define NCI_HCI_ADM_CREATE_PIPE 0x10
+#define NCI_HCI_ADM_DELETE_PIPE 0x11
/* HCP headers */
#define NCI_HCI_HCP_PACKET_HEADER_LEN 1
@@ -101,6 +104,20 @@ struct nci_hcp_packet {
#define NCI_HCP_MSG_GET_CMD(header) (header & 0x3f)
#define NCI_HCP_MSG_GET_PIPE(header) (header & 0x7f)
+static int nci_hci_result_to_errno(u8 result)
+{
+ switch (result) {
+ case NCI_HCI_ANY_OK:
+ return 0;
+ case NCI_HCI_ANY_E_REG_PAR_UNKNOWN:
+ return -EOPNOTSUPP;
+ case NCI_HCI_ANY_E_TIMEOUT:
+ return -ETIME;
+ default:
+ return -1;
+ }
+}
+
/* HCI core */
static void nci_hci_reset_pipes(struct nci_hci_dev *hdev)
{
@@ -146,18 +163,18 @@ static int nci_hci_send_data(struct nci_dev *ndev, u8 pipe,
if (!conn_info)
return -EPROTO;
- skb = nci_skb_alloc(ndev, 2 + conn_info->max_pkt_payload_len +
+ i = 0;
+ skb = nci_skb_alloc(ndev, conn_info->max_pkt_payload_len +
NCI_DATA_HDR_SIZE, GFP_KERNEL);
if (!skb)
return -ENOMEM;
- skb_reserve(skb, 2 + NCI_DATA_HDR_SIZE);
+ skb_reserve(skb, NCI_DATA_HDR_SIZE + 2);
*skb_push(skb, 1) = data_type;
- i = 0;
- len = conn_info->max_pkt_payload_len;
-
do {
+ len = conn_info->max_pkt_payload_len;
+
/* If last packet add NCI_HFP_NO_CHAINING */
if (i + conn_info->max_pkt_payload_len -
(skb->len + 1) >= data_len) {
@@ -177,9 +194,15 @@ static int nci_hci_send_data(struct nci_dev *ndev, u8 pipe,
return r;
i += len;
+
if (i < data_len) {
- skb_trim(skb, 0);
- skb_pull(skb, len);
+ skb = nci_skb_alloc(ndev,
+ conn_info->max_pkt_payload_len +
+ NCI_DATA_HDR_SIZE, GFP_KERNEL);
+ if (!skb)
+ return -ENOMEM;
+
+ skb_reserve(skb, NCI_DATA_HDR_SIZE + 1);
}
} while (i < data_len);
@@ -212,7 +235,8 @@ int nci_hci_send_cmd(struct nci_dev *ndev, u8 gate, u8 cmd,
const u8 *param, size_t param_len,
struct sk_buff **skb)
{
- struct nci_conn_info *conn_info;
+ struct nci_hcp_message *message;
+ struct nci_conn_info *conn_info;
struct nci_data data;
int r;
u8 pipe = ndev->hci_dev->gate2pipe[gate];
@@ -232,14 +256,34 @@ int nci_hci_send_cmd(struct nci_dev *ndev, u8 gate, u8 cmd,
r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
msecs_to_jiffies(NCI_DATA_TIMEOUT));
-
- if (r == NCI_STATUS_OK && skb)
- *skb = conn_info->rx_skb;
+ if (r == NCI_STATUS_OK) {
+ message = (struct nci_hcp_message *)conn_info->rx_skb->data;
+ r = nci_hci_result_to_errno(
+ NCI_HCP_MSG_GET_CMD(message->header));
+ skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
+
+ if (!r && skb)
+ *skb = conn_info->rx_skb;
+ }
return r;
}
EXPORT_SYMBOL(nci_hci_send_cmd);
+int nci_hci_clear_all_pipes(struct nci_dev *ndev)
+{
+ int r;
+
+ r = nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
+ NCI_HCI_ADM_CLEAR_ALL_PIPE, NULL, 0, NULL);
+ if (r < 0)
+ return r;
+
+ nci_hci_reset_pipes(ndev->hci_dev);
+ return r;
+}
+EXPORT_SYMBOL(nci_hci_clear_all_pipes);
+
static void nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
u8 event, struct sk_buff *skb)
{
@@ -328,9 +372,6 @@ static void nci_hci_resp_received(struct nci_dev *ndev, u8 pipe,
struct nci_conn_info *conn_info;
u8 status = result;
- if (result != NCI_HCI_ANY_OK)
- goto exit;
-
conn_info = ndev->hci_dev->conn_info;
if (!conn_info) {
status = NCI_STATUS_REJECTED;
@@ -340,7 +381,7 @@ static void nci_hci_resp_received(struct nci_dev *ndev, u8 pipe,
conn_info->rx_skb = skb;
exit:
- nci_req_complete(ndev, status);
+ nci_req_complete(ndev, NCI_STATUS_OK);
}
/* Receive hcp message for pipe, with type and cmd.
@@ -366,7 +407,7 @@ static void nci_hci_hcp_message_rx(struct nci_dev *ndev, u8 pipe,
break;
}
- nci_req_complete(ndev, 0);
+ nci_req_complete(ndev, NCI_STATUS_OK);
}
static void nci_hci_msg_rx_work(struct work_struct *work)
@@ -378,7 +419,7 @@ static void nci_hci_msg_rx_work(struct work_struct *work)
u8 pipe, type, instruction;
while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
- pipe = skb->data[0];
+ pipe = NCI_HCP_MSG_GET_PIPE(skb->data[0]);
skb_pull(skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
message = (struct nci_hcp_message *)skb->data;
type = NCI_HCP_MSG_GET_TYPE(message->header);
@@ -395,7 +436,7 @@ void nci_hci_data_received_cb(void *context,
{
struct nci_dev *ndev = (struct nci_dev *)context;
struct nci_hcp_packet *packet;
- u8 pipe, type, instruction;
+ u8 pipe, type;
struct sk_buff *hcp_skb;
struct sk_buff *frag_skb;
int msg_len;
@@ -415,7 +456,7 @@ void nci_hci_data_received_cb(void *context,
/* it's the last fragment. Does it need re-aggregation? */
if (skb_queue_len(&ndev->hci_dev->rx_hcp_frags)) {
- pipe = packet->header & NCI_HCI_FRAGMENT;
+ pipe = NCI_HCP_MSG_GET_PIPE(packet->header);
skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
msg_len = 0;
@@ -434,7 +475,7 @@ void nci_hci_data_received_cb(void *context,
*skb_put(hcp_skb, NCI_HCI_HCP_PACKET_HEADER_LEN) = pipe;
skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
- msg_len = frag_skb->len - NCI_HCI_HCP_PACKET_HEADER_LEN;
+ msg_len = frag_skb->len - NCI_HCI_HCP_PACKET_HEADER_LEN;
memcpy(skb_put(hcp_skb, msg_len), frag_skb->data +
NCI_HCI_HCP_PACKET_HEADER_LEN, msg_len);
}
@@ -452,11 +493,10 @@ void nci_hci_data_received_cb(void *context,
packet = (struct nci_hcp_packet *)hcp_skb->data;
type = NCI_HCP_MSG_GET_TYPE(packet->message.header);
if (type == NCI_HCI_HCP_RESPONSE) {
- pipe = packet->header;
- instruction = NCI_HCP_MSG_GET_CMD(packet->message.header);
- skb_pull(hcp_skb, NCI_HCI_HCP_PACKET_HEADER_LEN +
- NCI_HCI_HCP_MESSAGE_HEADER_LEN);
- nci_hci_hcp_message_rx(ndev, pipe, type, instruction, hcp_skb);
+ pipe = NCI_HCP_MSG_GET_PIPE(packet->header);
+ skb_pull(hcp_skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
+ nci_hci_hcp_message_rx(ndev, pipe, type,
+ NCI_STATUS_OK, hcp_skb);
} else {
skb_queue_tail(&ndev->hci_dev->msg_rx_queue, hcp_skb);
schedule_work(&ndev->hci_dev->msg_rx_work);
@@ -485,9 +525,47 @@ int nci_hci_open_pipe(struct nci_dev *ndev, u8 pipe)
}
EXPORT_SYMBOL(nci_hci_open_pipe);
+static u8 nci_hci_create_pipe(struct nci_dev *ndev, u8 dest_host,
+ u8 dest_gate, int *result)
+{
+ u8 pipe;
+ struct sk_buff *skb;
+ struct nci_hci_create_pipe_params params;
+ struct nci_hci_create_pipe_resp *resp;
+
+ pr_debug("gate=%d\n", dest_gate);
+
+ params.src_gate = NCI_HCI_ADMIN_GATE;
+ params.dest_host = dest_host;
+ params.dest_gate = dest_gate;
+
+ *result = nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
+ NCI_HCI_ADM_CREATE_PIPE,
+ (u8 *)&params, sizeof(params), &skb);
+ if (*result < 0)
+ return NCI_HCI_INVALID_PIPE;
+
+ resp = (struct nci_hci_create_pipe_resp *)skb->data;
+ pipe = resp->pipe;
+ kfree_skb(skb);
+
+ pr_debug("pipe created=%d\n", pipe);
+
+ return pipe;
+}
+
+static int nci_hci_delete_pipe(struct nci_dev *ndev, u8 pipe)
+{
+ pr_debug("\n");
+
+ return nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
+ NCI_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
+}
+
int nci_hci_set_param(struct nci_dev *ndev, u8 gate, u8 idx,
const u8 *param, size_t param_len)
{
+ struct nci_hcp_message *message;
struct nci_conn_info *conn_info;
struct nci_data data;
int r;
@@ -520,6 +598,12 @@ int nci_hci_set_param(struct nci_dev *ndev, u8 gate, u8 idx,
r = nci_request(ndev, nci_hci_send_data_req,
(unsigned long)&data,
msecs_to_jiffies(NCI_DATA_TIMEOUT));
+ if (r == NCI_STATUS_OK) {
+ message = (struct nci_hcp_message *)conn_info->rx_skb->data;
+ r = nci_hci_result_to_errno(
+ NCI_HCP_MSG_GET_CMD(message->header));
+ skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
+ }
kfree(tmp);
return r;
@@ -529,6 +613,7 @@ EXPORT_SYMBOL(nci_hci_set_param);
int nci_hci_get_param(struct nci_dev *ndev, u8 gate, u8 idx,
struct sk_buff **skb)
{
+ struct nci_hcp_message *message;
struct nci_conn_info *conn_info;
struct nci_data data;
int r;
@@ -553,8 +638,15 @@ int nci_hci_get_param(struct nci_dev *ndev, u8 gate, u8 idx,
r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
msecs_to_jiffies(NCI_DATA_TIMEOUT));
- if (r == NCI_STATUS_OK)
- *skb = conn_info->rx_skb;
+ if (r == NCI_STATUS_OK) {
+ message = (struct nci_hcp_message *)conn_info->rx_skb->data;
+ r = nci_hci_result_to_errno(
+ NCI_HCP_MSG_GET_CMD(message->header));
+ skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
+
+ if (!r && skb)
+ *skb = conn_info->rx_skb;
+ }
return r;
}
@@ -563,6 +655,7 @@ EXPORT_SYMBOL(nci_hci_get_param);
int nci_hci_connect_gate(struct nci_dev *ndev,
u8 dest_host, u8 dest_gate, u8 pipe)
{
+ bool pipe_created = false;
int r;
if (pipe == NCI_HCI_DO_NOT_OPEN_PIPE)
@@ -581,12 +674,26 @@ int nci_hci_connect_gate(struct nci_dev *ndev,
case NCI_HCI_ADMIN_GATE:
pipe = NCI_HCI_ADMIN_PIPE;
break;
+ default:
+ pipe = nci_hci_create_pipe(ndev, dest_host, dest_gate, &r);
+ if (pipe < 0)
+ return r;
+ pipe_created = true;
+ break;
}
open_pipe:
r = nci_hci_open_pipe(ndev, pipe);
- if (r < 0)
+ if (r < 0) {
+ if (pipe_created) {
+ if (nci_hci_delete_pipe(ndev, pipe) < 0) {
+ /* TODO: Cannot clean by deleting pipe...
+ * -> inconsistent state
+ */
+ }
+ }
return r;
+ }
ndev->hci_dev->pipes[pipe].gate = dest_gate;
ndev->hci_dev->pipes[pipe].host = dest_host;
@@ -639,23 +746,24 @@ int nci_hci_dev_session_init(struct nci_dev *ndev)
ndev->hci_dev->init_data.gates[0].gate,
ndev->hci_dev->init_data.gates[0].pipe);
if (r < 0)
- goto exit;
+ return r;
r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY, &skb);
if (r < 0)
- goto exit;
+ return r;
if (skb->len &&
skb->len == strlen(ndev->hci_dev->init_data.session_id) &&
- memcmp(ndev->hci_dev->init_data.session_id,
- skb->data, skb->len) == 0 &&
+ !memcmp(ndev->hci_dev->init_data.session_id, skb->data, skb->len) &&
ndev->ops->hci_load_session) {
/* Restore gate<->pipe table from some proprietary location. */
r = ndev->ops->hci_load_session(ndev);
+ } else {
+ r = nci_hci_clear_all_pipes(ndev);
if (r < 0)
goto exit;
- } else {
+
r = nci_hci_dev_connect_gates(ndev,
ndev->hci_dev->init_data.gate_count,
ndev->hci_dev->init_data.gates);
@@ -667,8 +775,6 @@ int nci_hci_dev_session_init(struct nci_dev *ndev)
ndev->hci_dev->init_data.session_id,
strlen(ndev->hci_dev->init_data.session_id));
}
- if (r == 0)
- goto exit;
exit:
kfree_skb(skb);
diff --git a/kernel/net/nfc/nci/ntf.c b/kernel/net/nfc/nci/ntf.c
index 321807107..2ada2b39e 100644
--- a/kernel/net/nfc/nci/ntf.c
+++ b/kernel/net/nfc/nci/ntf.c
@@ -758,6 +758,15 @@ void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
/* strip the nci control header */
skb_pull(skb, NCI_CTRL_HDR_SIZE);
+ if (nci_opcode_gid(ntf_opcode) == NCI_GID_PROPRIETARY) {
+ if (nci_prop_ntf_packet(ndev, ntf_opcode, skb) == -ENOTSUPP) {
+ pr_err("unsupported ntf opcode 0x%x\n",
+ ntf_opcode);
+ }
+
+ goto end;
+ }
+
switch (ntf_opcode) {
case NCI_OP_CORE_CONN_CREDITS_NTF:
nci_core_conn_credits_ntf_packet(ndev, skb);
@@ -796,5 +805,7 @@ void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
break;
}
+ nci_core_ntf_packet(ndev, ntf_opcode, skb);
+end:
kfree_skb(skb);
}
diff --git a/kernel/net/nfc/nci/rsp.c b/kernel/net/nfc/nci/rsp.c
index 02486bc2c..9b6eb913d 100644
--- a/kernel/net/nfc/nci/rsp.c
+++ b/kernel/net/nfc/nci/rsp.c
@@ -296,6 +296,15 @@ void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
/* 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);
@@ -346,6 +355,8 @@ void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
break;
}
+ nci_core_rsp_packet(ndev, rsp_opcode, skb);
+end:
kfree_skb(skb);
/* trigger the next cmd */
diff --git a/kernel/net/nfc/nci/spi.c b/kernel/net/nfc/nci/spi.c
index ec250e777..d904cd2f1 100644
--- a/kernel/net/nfc/nci/spi.c
+++ b/kernel/net/nfc/nci/spi.c
@@ -18,6 +18,8 @@
#define pr_fmt(fmt) "nci_spi: %s: " fmt, __func__
+#include <linux/module.h>
+
#include <linux/export.h>
#include <linux/spi/spi.h>
#include <linux/crc-ccitt.h>
@@ -56,6 +58,7 @@ static int __nci_spi_send(struct nci_spi *nspi, struct sk_buff *skb,
}
t.cs_change = cs_change;
t.delay_usecs = nspi->xfer_udelay;
+ t.speed_hz = nspi->xfer_speed_hz;
spi_message_init(&m);
spi_message_add_tail(&t, &m);
@@ -142,7 +145,8 @@ struct nci_spi *nci_spi_allocate_spi(struct spi_device *spi,
nspi->acknowledge_mode = acknowledge_mode;
nspi->xfer_udelay = delay;
-
+ /* Use controller max SPI speed by default */
+ nspi->xfer_speed_hz = 0;
nspi->spi = spi;
nspi->ndev = ndev;
init_completion(&nspi->req_completion);
@@ -195,12 +199,14 @@ static struct sk_buff *__nci_spi_read(struct nci_spi *nspi)
tx.tx_buf = req;
tx.len = 2;
tx.cs_change = 0;
+ tx.speed_hz = nspi->xfer_speed_hz;
spi_message_add_tail(&tx, &m);
memset(&rx, 0, sizeof(struct spi_transfer));
rx.rx_buf = resp_hdr;
rx.len = 2;
rx.cs_change = 1;
+ rx.speed_hz = nspi->xfer_speed_hz;
spi_message_add_tail(&rx, &m);
ret = spi_sync(nspi->spi, &m);
@@ -224,6 +230,7 @@ static struct sk_buff *__nci_spi_read(struct nci_spi *nspi)
rx.len = rx_len;
rx.cs_change = 0;
rx.delay_usecs = nspi->xfer_udelay;
+ rx.speed_hz = nspi->xfer_speed_hz;
spi_message_add_tail(&rx, &m);
ret = spi_sync(nspi->spi, &m);
@@ -320,3 +327,5 @@ done:
return skb;
}
EXPORT_SYMBOL_GPL(nci_spi_read);
+
+MODULE_LICENSE("GPL");
diff --git a/kernel/net/nfc/nci/uart.c b/kernel/net/nfc/nci/uart.c
new file mode 100644
index 000000000..21d887567
--- /dev/null
+++ b/kernel/net/nfc/nci/uart.c
@@ -0,0 +1,494 @@
+/*
+ * Copyright (C) 2015, Marvell International Ltd.
+ *
+ * This software file (the "File") is distributed by Marvell International
+ * Ltd. under the terms of the GNU General Public License Version 2, June 1991
+ * (the "License"). You may use, redistribute and/or modify this File in
+ * accordance with the terms and conditions of the License, a copy of which
+ * is available on the worldwide web at
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
+ *
+ * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
+ * ARE EXPRESSLY DISCLAIMED. The License provides additional details about
+ * this warranty disclaimer.
+ */
+
+/* Inspired (hugely) by HCI LDISC implementation in Bluetooth.
+ *
+ * Copyright (C) 2000-2001 Qualcomm Incorporated
+ * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
+ * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
+ */
+
+#include <linux/module.h>
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/poll.h>
+
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/signal.h>
+#include <linux/ioctl.h>
+#include <linux/skbuff.h>
+
+#include <net/nfc/nci.h>
+#include <net/nfc/nci_core.h>
+
+/* TX states */
+#define NCI_UART_SENDING 1
+#define NCI_UART_TX_WAKEUP 2
+
+static struct nci_uart *nci_uart_drivers[NCI_UART_DRIVER_MAX];
+
+static inline struct sk_buff *nci_uart_dequeue(struct nci_uart *nu)
+{
+ struct sk_buff *skb = nu->tx_skb;
+
+ if (!skb)
+ skb = skb_dequeue(&nu->tx_q);
+ else
+ nu->tx_skb = NULL;
+
+ return skb;
+}
+
+static inline int nci_uart_queue_empty(struct nci_uart *nu)
+{
+ if (nu->tx_skb)
+ return 0;
+
+ return skb_queue_empty(&nu->tx_q);
+}
+
+static int nci_uart_tx_wakeup(struct nci_uart *nu)
+{
+ if (test_and_set_bit(NCI_UART_SENDING, &nu->tx_state)) {
+ set_bit(NCI_UART_TX_WAKEUP, &nu->tx_state);
+ return 0;
+ }
+
+ schedule_work(&nu->write_work);
+
+ return 0;
+}
+
+static void nci_uart_write_work(struct work_struct *work)
+{
+ struct nci_uart *nu = container_of(work, struct nci_uart, write_work);
+ struct tty_struct *tty = nu->tty;
+ struct sk_buff *skb;
+
+restart:
+ clear_bit(NCI_UART_TX_WAKEUP, &nu->tx_state);
+
+ if (nu->ops.tx_start)
+ nu->ops.tx_start(nu);
+
+ while ((skb = nci_uart_dequeue(nu))) {
+ int len;
+
+ set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+ len = tty->ops->write(tty, skb->data, skb->len);
+ skb_pull(skb, len);
+ if (skb->len) {
+ nu->tx_skb = skb;
+ break;
+ }
+ kfree_skb(skb);
+ }
+
+ if (test_bit(NCI_UART_TX_WAKEUP, &nu->tx_state))
+ goto restart;
+
+ if (nu->ops.tx_done && nci_uart_queue_empty(nu))
+ nu->ops.tx_done(nu);
+
+ clear_bit(NCI_UART_SENDING, &nu->tx_state);
+}
+
+static int nci_uart_set_driver(struct tty_struct *tty, unsigned int driver)
+{
+ struct nci_uart *nu = NULL;
+ int ret;
+
+ if (driver >= NCI_UART_DRIVER_MAX)
+ return -EINVAL;
+
+ if (!nci_uart_drivers[driver])
+ return -ENOENT;
+
+ nu = kzalloc(sizeof(*nu), GFP_KERNEL);
+ if (!nu)
+ return -ENOMEM;
+
+ memcpy(nu, nci_uart_drivers[driver], sizeof(struct nci_uart));
+ nu->tty = tty;
+ tty->disc_data = nu;
+ skb_queue_head_init(&nu->tx_q);
+ INIT_WORK(&nu->write_work, nci_uart_write_work);
+ spin_lock_init(&nu->rx_lock);
+
+ ret = nu->ops.open(nu);
+ if (ret) {
+ tty->disc_data = NULL;
+ kfree(nu);
+ } else if (!try_module_get(nu->owner)) {
+ nu->ops.close(nu);
+ tty->disc_data = NULL;
+ kfree(nu);
+ return -ENOENT;
+ }
+ return ret;
+}
+
+/* ------ LDISC part ------ */
+
+/* nci_uart_tty_open
+ *
+ * Called when line discipline changed to NCI_UART.
+ *
+ * Arguments:
+ * tty pointer to tty info structure
+ * Return Value:
+ * 0 if success, otherwise error code
+ */
+static int nci_uart_tty_open(struct tty_struct *tty)
+{
+ /* Error if the tty has no write op instead of leaving an exploitable
+ * hole
+ */
+ if (!tty->ops->write)
+ return -EOPNOTSUPP;
+
+ tty->disc_data = NULL;
+ tty->receive_room = 65536;
+
+ /* Flush any pending characters in the driver and line discipline. */
+
+ /* FIXME: why is this needed. Note don't use ldisc_ref here as the
+ * open path is before the ldisc is referencable.
+ */
+
+ if (tty->ldisc->ops->flush_buffer)
+ tty->ldisc->ops->flush_buffer(tty);
+ tty_driver_flush_buffer(tty);
+
+ return 0;
+}
+
+/* nci_uart_tty_close()
+ *
+ * Called when the line discipline is changed to something
+ * else, the tty is closed, or the tty detects a hangup.
+ */
+static void nci_uart_tty_close(struct tty_struct *tty)
+{
+ struct nci_uart *nu = (void *)tty->disc_data;
+
+ /* Detach from the tty */
+ tty->disc_data = NULL;
+
+ if (!nu)
+ return;
+
+ if (nu->tx_skb)
+ kfree_skb(nu->tx_skb);
+ if (nu->rx_skb)
+ kfree_skb(nu->rx_skb);
+
+ skb_queue_purge(&nu->tx_q);
+
+ nu->ops.close(nu);
+ nu->tty = NULL;
+ module_put(nu->owner);
+
+ cancel_work_sync(&nu->write_work);
+
+ kfree(nu);
+}
+
+/* nci_uart_tty_wakeup()
+ *
+ * Callback for transmit wakeup. Called when low level
+ * device driver can accept more send data.
+ *
+ * Arguments: tty pointer to associated tty instance data
+ * Return Value: None
+ */
+static void nci_uart_tty_wakeup(struct tty_struct *tty)
+{
+ struct nci_uart *nu = (void *)tty->disc_data;
+
+ if (!nu)
+ return;
+
+ clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+
+ if (tty != nu->tty)
+ return;
+
+ nci_uart_tx_wakeup(nu);
+}
+
+/* nci_uart_tty_receive()
+ *
+ * Called by tty low level driver when receive data is
+ * available.
+ *
+ * Arguments: tty pointer to tty isntance data
+ * data pointer to received data
+ * flags pointer to flags for data
+ * count count of received data in bytes
+ *
+ * Return Value: None
+ */
+static void nci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
+ char *flags, int count)
+{
+ struct nci_uart *nu = (void *)tty->disc_data;
+
+ if (!nu || tty != nu->tty)
+ return;
+
+ spin_lock(&nu->rx_lock);
+ nu->ops.recv_buf(nu, (void *)data, flags, count);
+ spin_unlock(&nu->rx_lock);
+
+ tty_unthrottle(tty);
+}
+
+/* nci_uart_tty_ioctl()
+ *
+ * Process IOCTL system call for the tty device.
+ *
+ * Arguments:
+ *
+ * tty pointer to tty instance data
+ * file pointer to open file object for device
+ * cmd IOCTL command code
+ * arg argument for IOCTL call (cmd dependent)
+ *
+ * Return Value: Command dependent
+ */
+static int nci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct nci_uart *nu = (void *)tty->disc_data;
+ int err = 0;
+
+ switch (cmd) {
+ case NCIUARTSETDRIVER:
+ if (!nu)
+ return nci_uart_set_driver(tty, (unsigned int)arg);
+ else
+ return -EBUSY;
+ break;
+ default:
+ err = n_tty_ioctl_helper(tty, file, cmd, arg);
+ break;
+ }
+
+ return err;
+}
+
+/* We don't provide read/write/poll interface for user space. */
+static ssize_t nci_uart_tty_read(struct tty_struct *tty, struct file *file,
+ unsigned char __user *buf, size_t nr)
+{
+ return 0;
+}
+
+static ssize_t nci_uart_tty_write(struct tty_struct *tty, struct file *file,
+ const unsigned char *data, size_t count)
+{
+ return 0;
+}
+
+static unsigned int nci_uart_tty_poll(struct tty_struct *tty,
+ struct file *filp, poll_table *wait)
+{
+ return 0;
+}
+
+static int nci_uart_send(struct nci_uart *nu, struct sk_buff *skb)
+{
+ /* Queue TX packet */
+ skb_queue_tail(&nu->tx_q, skb);
+
+ /* Try to start TX (if possible) */
+ nci_uart_tx_wakeup(nu);
+
+ return 0;
+}
+
+/* -- 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;
+}
+
+/* -- Default recv handler -- */
+static int nci_uart_default_recv(struct nci_uart *nu, struct sk_buff *skb)
+{
+ return nci_recv_frame(nu->ndev, skb);
+}
+
+int nci_uart_register(struct nci_uart *nu)
+{
+ if (!nu || !nu->ops.open ||
+ !nu->ops.recv || !nu->ops.close)
+ return -EINVAL;
+
+ /* Set the send callback */
+ nu->ops.send = nci_uart_send;
+
+ /* Install default handlers if not overridden */
+ if (!nu->ops.recv_buf)
+ nu->ops.recv_buf = nci_uart_default_recv_buf;
+ if (!nu->ops.recv)
+ nu->ops.recv = nci_uart_default_recv;
+
+ /* Add this driver in the driver list */
+ if (nci_uart_drivers[nu->driver]) {
+ pr_err("driver %d is already registered\n", nu->driver);
+ return -EBUSY;
+ }
+ nci_uart_drivers[nu->driver] = nu;
+
+ pr_info("NCI uart driver '%s [%d]' registered\n", nu->name, nu->driver);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nci_uart_register);
+
+void nci_uart_unregister(struct nci_uart *nu)
+{
+ pr_info("NCI uart driver '%s [%d]' unregistered\n", nu->name,
+ nu->driver);
+
+ /* Remove this driver from the driver list */
+ nci_uart_drivers[nu->driver] = NULL;
+}
+EXPORT_SYMBOL_GPL(nci_uart_unregister);
+
+void nci_uart_set_config(struct nci_uart *nu, int baudrate, int flow_ctrl)
+{
+ struct ktermios new_termios;
+
+ if (!nu->tty)
+ return;
+
+ down_read(&nu->tty->termios_rwsem);
+ new_termios = nu->tty->termios;
+ up_read(&nu->tty->termios_rwsem);
+ tty_termios_encode_baud_rate(&new_termios, baudrate, baudrate);
+
+ if (flow_ctrl)
+ new_termios.c_cflag |= CRTSCTS;
+ else
+ new_termios.c_cflag &= ~CRTSCTS;
+
+ tty_set_termios(nu->tty, &new_termios);
+}
+EXPORT_SYMBOL_GPL(nci_uart_set_config);
+
+static struct tty_ldisc_ops nci_uart_ldisc = {
+ .magic = TTY_LDISC_MAGIC,
+ .owner = THIS_MODULE,
+ .name = "n_nci",
+ .open = nci_uart_tty_open,
+ .close = nci_uart_tty_close,
+ .read = nci_uart_tty_read,
+ .write = nci_uart_tty_write,
+ .poll = nci_uart_tty_poll,
+ .receive_buf = nci_uart_tty_receive,
+ .write_wakeup = nci_uart_tty_wakeup,
+ .ioctl = nci_uart_tty_ioctl,
+};
+
+static int __init nci_uart_init(void)
+{
+ memset(nci_uart_drivers, 0, sizeof(nci_uart_drivers));
+ return tty_register_ldisc(N_NCI, &nci_uart_ldisc);
+}
+
+static void __exit nci_uart_exit(void)
+{
+ tty_unregister_ldisc(N_NCI);
+}
+
+module_init(nci_uart_init);
+module_exit(nci_uart_exit);
+
+MODULE_AUTHOR("Marvell International Ltd.");
+MODULE_DESCRIPTION("NFC NCI UART driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_LDISC(N_NCI);