Some st21nfcb features are only available through HCI commands. Those HCI commands can be address over NCI by sending data using a dynamic conn_id. This is useful for example for Secure Element communication. The HCI core brings the minimal HCI functions required to communicate with a secure element. Signed-off-by: Christophe Ricard <christophe-h.ricard@xxxxxx> --- drivers/nfc/st21nfcb/Makefile | 2 +- drivers/nfc/st21nfcb/st21nfcb_hci_core.c | 823 +++++++++++++++++++++++++++++++ drivers/nfc/st21nfcb/st21nfcb_hci_core.h | 134 +++++ 3 files changed, 958 insertions(+), 1 deletion(-) create mode 100644 drivers/nfc/st21nfcb/st21nfcb_hci_core.c create mode 100644 drivers/nfc/st21nfcb/st21nfcb_hci_core.h diff --git a/drivers/nfc/st21nfcb/Makefile b/drivers/nfc/st21nfcb/Makefile index f4d835d..974c2e9 100644 --- a/drivers/nfc/st21nfcb/Makefile +++ b/drivers/nfc/st21nfcb/Makefile @@ -2,7 +2,7 @@ # Makefile for ST21NFCB NCI based NFC driver # -st21nfcb_nci-objs = ndlc.o st21nfcb.o +st21nfcb_nci-objs = ndlc.o st21nfcb.o st21nfcb_hci_core.o obj-$(CONFIG_NFC_ST21NFCB) += st21nfcb_nci.o st21nfcb_i2c-objs = i2c.o diff --git a/drivers/nfc/st21nfcb/st21nfcb_hci_core.c b/drivers/nfc/st21nfcb/st21nfcb_hci_core.c new file mode 100644 index 0000000..ba48dce --- /dev/null +++ b/drivers/nfc/st21nfcb/st21nfcb_hci_core.c @@ -0,0 +1,823 @@ +/* + * NCI based Driver for STMicroelectronics NFC Chip + * + * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions 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, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/module.h> +#include <linux/nfc.h> +#include <net/nfc/nci.h> +#include <net/nfc/nci_core.h> + +#include "st21nfcb_hci_core.h" + +struct nci_data { + u8 conn_id; + u8 pipe; + u8 cmd; + const u8 *data; + u32 data_len; +} __packed; + +struct st21nfcb_hci_create_pipe_params { + u8 src_gate; + u8 dest_host; + u8 dest_gate; +} __packed; + +struct st21nfcb_hci_create_pipe_resp { + u8 src_host; + u8 src_gate; + u8 dest_host; + u8 dest_gate; + u8 pipe; +} __packed; + +struct st21nfcb_hci_delete_pipe_noti { + u8 pipe; +} __packed; + +struct st21nfcb_hci_all_pipe_cleared_noti { + u8 host; +} __packed; + +struct st21nfcb_hcp_message { + u8 header; /* type -cmd,evt,rsp- + instruction */ + u8 data[]; +} __packed; + +struct st21nfcb_hcp_packet { + u8 header; /* cbit+pipe */ + struct st21nfcb_hcp_message message; +} __packed; + + +#define ST21NFCB_HCI_ANY_SET_PARAMETER 0x01 +#define ST21NFCB_HCI_ANY_GET_PARAMETER 0x02 +#define ST21NFCB_HCI_ANY_CLOSE_PIPE 0x04 + +#define ST21NFCB_HFP_NO_CHAINING 0x80 + +#define NCI_NFCEE_ID_HCI 0x80 + +#define ST21NFCB_EVT_HOT_PLUG 0x03 + +#define ST21NFCB_HCI_ADMIN_PARAM_SESSION_IDENTITY 0x01 + +/* HCP headers */ +#define ST21NFCB_HCI_HCP_PACKET_HEADER_LEN 1 +#define ST21NFCB_HCI_HCP_MESSAGE_HEADER_LEN 1 +#define ST21NFCB_HCI_HCP_HEADER_LEN 2 + +/* HCP types */ +#define ST21NFCB_HCI_HCP_COMMAND 0x00 +#define ST21NFCB_HCI_HCP_EVENT 0x01 +#define ST21NFCB_HCI_HCP_RESPONSE 0x02 + +#define ST21NFCB_HCI_ADM_NOTIFY_PIPE_CREATED 0x12 +#define ST21NFCB_HCI_ADM_NOTIFY_PIPE_DELETED 0x13 +#define ST21NFCB_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED 0x15 + +#define ST21NFCB_HCI_FRAGMENT 0x7f +#define ST21NFCB_HCP_HEADER(type, instr) ((((type) & 0x03) << 6) |\ + ((instr) & 0x3f)) + +#define ST21NFCB_HCP_MSG_GET_TYPE(header) ((header & 0xc0) >> 6) +#define ST21NFCB_HCP_MSG_GET_CMD(header) (header & 0x3f) +#define ST21NFCB_HCP_MSG_GET_PIPE(header) (header & 0x7f) + +#define ST21NFCB_NUM_DEVICES 256 + +static DECLARE_BITMAP(dev_mask, ST21NFCB_NUM_DEVICES); + +static void st21nfcb_hci_data_received_cb(void *context, + struct sk_buff *skb, int err); + +static void st21nfcb_hci_reset_pipes(struct st21nfcb_hci_dev *hdev) +{ + int i; + + for (i = 0; i < ST21NFCB_HCI_MAX_PIPES; i++) { + hdev->pipes[i].gate = ST21NFCB_HCI_INVALID_GATE; + hdev->pipes[i].host = ST21NFCB_HCI_INVALID_HOST; + } + memset(hdev->gate2pipe, ST21NFCB_HCI_INVALID_PIPE, + sizeof(hdev->gate2pipe)); +} + +static void st21nfcb_hci_reset_pipes_per_host(struct st21nfcb_hci_dev *hdev, u8 host) +{ + int i; + + for (i = 0; i < ST21NFCB_HCI_MAX_PIPES; i++) { + if (hdev->pipes[i].host == host) { + hdev->pipes[i].gate = ST21NFCB_HCI_INVALID_GATE; + hdev->pipes[i].host = ST21NFCB_HCI_INVALID_HOST; + } + } +} + +/* Fragment HCI data over NCI packet. + * NFC Forum NCI 10.2.2 Data Exchange: + * The payload of the Data Packets sent on the Logical Connection SHALL be + * valid HCP packets, as defined within [ETSI_102622]. Each Data Packet SHALL + * contain a single HCP packet. NCI Segmentation and Reassembly SHALL NOT be + * applied to Data Messages in either direction. The HCI fragmentation mechanism + * is used if required. + */ +static int st21nfcb_hci_send_data(struct nci_dev *ndev, u8 conn_id, + u8 pipe, const u8 data_type, const u8 *data, + size_t data_len) +{ + struct nci_conn_info *conn_info; + struct sk_buff *skb; + int len, i, r; + u8 cb = pipe; + + list_for_each_entry(conn_info, &ndev->conn_info_list, list) { + if (conn_info->id == NCI_NFCEE_ID_HCI) + break; + } + + if (!conn_info || conn_info->id != NCI_NFCEE_ID_HCI) + return -EPROTO; + + skb = nci_skb_alloc(ndev, 2 + 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_push(skb, 1) = data_type; + + i = 0; + len = conn_info->max_pkt_payload_len; + + do { + /* If last packet add ST21NFCB_HFP_NO_CHAINING */ + if (i + conn_info->max_pkt_payload_len - + (skb->len + 1) >= data_len) { + cb |= ST21NFCB_HFP_NO_CHAINING; + len = data_len - i; + } else { + len = conn_info->max_pkt_payload_len - skb->len - 1; + } + + *skb_push(skb, 1) = cb; + + if (len > 0) + memcpy(skb_put(skb, len), data + i, len); + + r = nci_send_data(ndev, conn_info->conn_id, skb); + if (r < 0) + return r; + + i += len; + if (i < data_len) { + skb_trim(skb, 0); + skb_pull(skb, len); + } + } while (i < data_len); + + return i; +} + +static void st21nfcb_hci_send_data_req(struct nci_dev *ndev, unsigned long opt) +{ + struct nci_data *data = (struct nci_data *) opt; + + st21nfcb_hci_send_data(ndev, data->conn_id, data->pipe, data->cmd, + data->data, data->data_len); +} + +int st21nfcb_hci_send_event(struct st21nfcb_hci_dev *hdev, u8 gate, u8 event, + const u8 *param, size_t param_len) +{ + struct nci_dev *ndev = st21nfcb_hci_get_nci(hdev); + struct nci_conn_info *conn_info; + u8 pipe = hdev->gate2pipe[gate]; + + if (pipe == ST21NFCB_HCI_INVALID_PIPE) + return -EADDRNOTAVAIL; + + list_for_each_entry(conn_info, &ndev->conn_info_list, list) { + if (conn_info->id == NCI_NFCEE_ID_HCI) + break; + } + + if (!conn_info || conn_info->id != NCI_NFCEE_ID_HCI) + return -EPROTO; + + return st21nfcb_hci_send_data(ndev, conn_info->conn_id, pipe, + ST21NFCB_HCP_HEADER(ST21NFCB_HCI_HCP_EVENT, event), + param, param_len); +} +EXPORT_SYMBOL(st21nfcb_hci_send_event); + +int st21nfcb_hci_send_cmd(struct st21nfcb_hci_dev *hdev, u8 gate, + u8 cmd, const u8 *param, size_t param_len, + struct sk_buff **skb) +{ + struct nci_dev *ndev = st21nfcb_hci_get_nci(hdev); + struct nci_conn_info *conn_info; + struct nci_data data; + int r; + u8 pipe = hdev->gate2pipe[gate]; + + if (pipe == ST21NFCB_HCI_INVALID_PIPE) + return -EADDRNOTAVAIL; + + list_for_each_entry(conn_info, &ndev->conn_info_list, list) { + if (conn_info->id == NCI_NFCEE_ID_HCI) + break; + } + + if (!conn_info || conn_info->id != NCI_NFCEE_ID_HCI) + return -EPROTO; + + data.conn_id = conn_info->conn_id; + data.pipe = pipe; + data.cmd = ST21NFCB_HCP_HEADER(ST21NFCB_HCI_HCP_COMMAND, cmd); + data.data = param; + data.data_len = param_len; + + r = nci_request(ndev, st21nfcb_hci_send_data_req, (unsigned long)&data, + msecs_to_jiffies(NCI_DATA_TIMEOUT)); + + if (r == NCI_STATUS_OK) + *skb = conn_info->rx_skb; + + return r; +} +EXPORT_SYMBOL(st21nfcb_hci_send_cmd); + +int st21nfcb_hci_send_response(struct st21nfcb_hci_dev *hdev, u8 pipe, + u8 cmd, const u8 *param, size_t param_len) +{ + struct nci_dev *ndev = st21nfcb_hci_get_nci(hdev); + struct nci_conn_info *conn_info; + + list_for_each_entry(conn_info, &ndev->conn_info_list, list) { + if (conn_info->id == NCI_NFCEE_ID_HCI) + break; + } + + if (!conn_info || conn_info->id != NCI_NFCEE_ID_HCI) + return -EPROTO; + + return st21nfcb_hci_send_data(ndev, conn_info->conn_id, pipe, + ST21NFCB_HCP_HEADER(ST21NFCB_HCI_HCP_RESPONSE, cmd), + param, param_len); +} +EXPORT_SYMBOL(st21nfcb_hci_send_response); + +static void st21nfcb_hci_event_received(struct st21nfcb_hci_dev *hdev, u8 pipe, + u8 event, struct sk_buff *skb) +{ + if (hdev->ops->event_received) + hdev->ops->event_received(hdev, pipe, event, skb); +} + +static void st21nfcb_hci_cmd_received(struct st21nfcb_hci_dev *hdev, u8 pipe, + u8 cmd, struct sk_buff *skb) +{ + u8 gate = hdev->pipes[pipe].gate; + u8 status = ST21NFCB_HCI_ANY_OK; + struct st21nfcb_hci_create_pipe_resp *create_info; + struct st21nfcb_hci_delete_pipe_noti *delete_info; + struct st21nfcb_hci_all_pipe_cleared_noti *cleared_info; + + pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd); + + switch (cmd) { + case ST21NFCB_HCI_ADM_NOTIFY_PIPE_CREATED: + if (skb->len != 5) { + status = ST21NFCB_HCI_ANY_E_NOK; + goto exit; + } + create_info = (struct st21nfcb_hci_create_pipe_resp *)skb->data; + + /* + * Save the new created pipe and bind with local gate, + * the description for skb->data[3] is destination gate id + * but since we received this cmd from host controller, we + * are the destination and it is our local gate + */ + hdev->gate2pipe[create_info->dest_gate] = create_info->pipe; + hdev->pipes[create_info->pipe].gate = create_info->dest_gate; + hdev->pipes[create_info->pipe].host = create_info->src_host; + break; + case ST21NFCB_HCI_ANY_OPEN_PIPE: + /* If the pipe is not created report an error */ + if (gate == ST21NFCB_HCI_INVALID_GATE) { + status = ST21NFCB_HCI_ANY_E_NOK; + goto exit; + } + break; + case ST21NFCB_HCI_ADM_NOTIFY_PIPE_DELETED: + if (skb->len != 1) { + status = ST21NFCB_HCI_ANY_E_NOK; + goto exit; + } + delete_info = (struct st21nfcb_hci_delete_pipe_noti *)skb->data; + + hdev->pipes[delete_info->pipe].gate = ST21NFCB_HCI_INVALID_GATE; + hdev->pipes[delete_info->pipe].host = ST21NFCB_HCI_INVALID_HOST; + break; + case ST21NFCB_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED: + if (skb->len != 1) { + status = ST21NFCB_HCI_ANY_E_NOK; + goto exit; + } + cleared_info = (struct st21nfcb_hci_all_pipe_cleared_noti *)skb->data; + st21nfcb_hci_reset_pipes_per_host(hdev, cleared_info->host); + break; + default: + pr_debug("Discarded unknown cmd %x to gate %x\n", cmd, gate); + break; + } + + if (hdev->ops->cmd_received) + hdev->ops->cmd_received(hdev, pipe, cmd, skb); + +exit: + st21nfcb_hci_send_response(hdev, pipe, status, NULL, 0); + + kfree_skb(skb); +} + +static void st21nfcb_hci_resp_received(struct st21nfcb_hci_dev *hdev, u8 pipe, + u8 result, struct sk_buff *skb) +{ + struct nci_dev *ndev = st21nfcb_hci_get_nci(hdev); + struct nci_conn_info *conn_info; + u8 status = result; + + if (result != ST21NFCB_HCI_ANY_OK) + goto exit; + + list_for_each_entry(conn_info, &ndev->conn_info_list, list) { + if (conn_info->id == NCI_NFCEE_ID_HCI) + break; + } + + if (!conn_info || conn_info->id != NCI_NFCEE_ID_HCI) { + status = NCI_STATUS_REJECTED; + goto exit; + } + + conn_info->rx_skb = skb; + +exit: + nci_req_complete(ndev, status); +} + +/* + * Receive hcp message for pipe, with type and cmd. + * skb contains optional message data only. + */ +static void st21nfcb_hci_hcp_message_rx(struct st21nfcb_hci_dev *hdev, u8 pipe, + u8 type, u8 instruction, struct sk_buff *skb) +{ + struct nci_dev *ndev = st21nfcb_hci_get_nci(hdev); + + switch (type) { + case ST21NFCB_HCI_HCP_RESPONSE: + st21nfcb_hci_resp_received(hdev, pipe, instruction, skb); + break; + case ST21NFCB_HCI_HCP_COMMAND: + st21nfcb_hci_cmd_received(hdev, pipe, instruction, skb); + break; + case ST21NFCB_HCI_HCP_EVENT: + st21nfcb_hci_event_received(hdev, pipe, instruction, skb); + break; + default: + pr_err("UNKNOWN MSG Type %d, instruction=%d\n", + type, instruction); + kfree_skb(skb); + break; + } + + nci_req_complete(ndev, 0); +} + +static void st21nfcb_hci_msg_rx_work(struct work_struct *work) +{ + struct st21nfcb_hci_dev *hdev = container_of(work, + struct st21nfcb_hci_dev, + msg_rx_work); + struct sk_buff *skb; + struct st21nfcb_hcp_message *message; + u8 pipe, type, instruction; + + while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) { + pipe = skb->data[0]; + skb_pull(skb, ST21NFCB_HCI_HCP_PACKET_HEADER_LEN); + message = (struct st21nfcb_hcp_message *)skb->data; + type = ST21NFCB_HCP_MSG_GET_TYPE(message->header); + instruction = ST21NFCB_HCP_MSG_GET_CMD(message->header); + skb_pull(skb, ST21NFCB_HCI_HCP_MESSAGE_HEADER_LEN); + + st21nfcb_hci_hcp_message_rx(hdev, pipe, type, instruction, skb); + } +} + +static void st21nfcb_hci_data_received_cb(void *context, + struct sk_buff *skb, int err) +{ + struct st21nfcb_hci_dev *hdev = (struct st21nfcb_hci_dev *)context; + struct st21nfcb_hcp_packet *packet; + u8 pipe, type, instruction; + struct sk_buff *hcp_skb; + struct sk_buff *frag_skb; + int msg_len; + + pr_debug("\n"); + + if (err) { + nci_req_complete(hdev->ndev, err); + return; + } + + packet = (struct st21nfcb_hcp_packet *)skb->data; + if ((packet->header & ~ST21NFCB_HCI_FRAGMENT) == 0) { + skb_queue_tail(&hdev->rx_hcp_frags, skb); + return; + } + + /* it's the last fragment. Does it need re-aggregation? */ + if (skb_queue_len(&hdev->rx_hcp_frags)) { + pipe = packet->header & ST21NFCB_HCI_FRAGMENT; + skb_queue_tail(&hdev->rx_hcp_frags, skb); + + msg_len = 0; + skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { + msg_len += (frag_skb->len - + ST21NFCB_HCI_HCP_PACKET_HEADER_LEN); + } + + hcp_skb = nfc_alloc_recv_skb(ST21NFCB_HCI_HCP_PACKET_HEADER_LEN + + msg_len, GFP_KERNEL); + if (hcp_skb == NULL) { + nci_req_complete(hdev->ndev, -ENOMEM); + return; + } + + *skb_put(hcp_skb, ST21NFCB_HCI_HCP_PACKET_HEADER_LEN) = pipe; + + skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { + msg_len = frag_skb->len - + ST21NFCB_HCI_HCP_PACKET_HEADER_LEN; + memcpy(skb_put(hcp_skb, msg_len), frag_skb->data + + ST21NFCB_HCI_HCP_PACKET_HEADER_LEN, msg_len); + } + + skb_queue_purge(&hdev->rx_hcp_frags); + } else { + packet->header &= ST21NFCB_HCI_FRAGMENT; + hcp_skb = skb; + } + + /* if this is a response, dispatch immediately to + * unblock waiting cmd context. Otherwise, enqueue to dispatch + * in separate context where handler can also execute command. + */ + packet = (struct st21nfcb_hcp_packet *)hcp_skb->data; + type = ST21NFCB_HCP_MSG_GET_TYPE(packet->message.header); + if (type == ST21NFCB_HCI_HCP_RESPONSE) { + pipe = packet->header; + instruction = ST21NFCB_HCP_MSG_GET_CMD(packet->message.header); + skb_pull(hcp_skb, ST21NFCB_HCI_HCP_PACKET_HEADER_LEN + + ST21NFCB_HCI_HCP_MESSAGE_HEADER_LEN); + st21nfcb_hci_hcp_message_rx(hdev, pipe, type, instruction, + hcp_skb); + } else { + skb_queue_tail(&hdev->msg_rx_queue, hcp_skb); + schedule_work(&hdev->msg_rx_work); + } +} + +int st21nfcb_hci_open_pipe(struct st21nfcb_hci_dev *hdev, u8 pipe) +{ + struct nci_dev *ndev = st21nfcb_hci_get_nci(hdev); + struct nci_data data; + struct nci_conn_info *conn_info; + + list_for_each_entry(conn_info, &ndev->conn_info_list, list) { + if (conn_info->id == NCI_NFCEE_ID_HCI) + break; + } + + if (!conn_info || conn_info->id != NCI_NFCEE_ID_HCI) + return -EPROTO; + + data.conn_id = conn_info->conn_id; + data.pipe = pipe; + data.cmd = ST21NFCB_HCP_HEADER(ST21NFCB_HCI_HCP_COMMAND, + ST21NFCB_HCI_ANY_OPEN_PIPE); + data.data = NULL; + data.data_len = 0; + + return nci_request(ndev, st21nfcb_hci_send_data_req, + (unsigned long)&data, + msecs_to_jiffies(NCI_DATA_TIMEOUT)); +} +EXPORT_SYMBOL(st21nfcb_hci_open_pipe); + +int st21nfcb_hci_set_param(struct st21nfcb_hci_dev *hdev, u8 gate, u8 idx, + const u8 *param, size_t param_len) +{ + struct nci_dev *ndev = st21nfcb_hci_get_nci(hdev); + struct nci_conn_info *conn_info; + struct nci_data data; + int r; + u8 *tmp; + u8 pipe = hdev->gate2pipe[gate]; + + pr_debug("idx=%d to gate %d\n", idx, gate); + + if (pipe == ST21NFCB_HCI_INVALID_PIPE) + return -EADDRNOTAVAIL; + + list_for_each_entry(conn_info, &ndev->conn_info_list, list) { + if (conn_info->id == NCI_NFCEE_ID_HCI) + break; + } + + if (!conn_info || conn_info->id != NCI_NFCEE_ID_HCI) + return -EPROTO; + + tmp = kmalloc(1 + param_len, GFP_KERNEL); + if (!tmp) + return -ENOMEM; + + *tmp = idx; + memcpy(tmp + 1, param, param_len); + + data.conn_id = conn_info->conn_id; + data.pipe = pipe; + data.cmd = ST21NFCB_HCP_HEADER(ST21NFCB_HCI_HCP_COMMAND, + ST21NFCB_HCI_ANY_SET_PARAMETER); + data.data = tmp; + data.data_len = param_len + 1; + + r = nci_request(ndev, st21nfcb_hci_send_data_req, + (unsigned long)&data, + msecs_to_jiffies(NCI_DATA_TIMEOUT)); + + kfree(tmp); + return r; +} +EXPORT_SYMBOL(st21nfcb_hci_set_param); + +int st21nfcb_hci_get_param(struct st21nfcb_hci_dev *hdev, u8 gate, u8 idx, + struct sk_buff **skb) +{ + struct nci_dev *ndev = st21nfcb_hci_get_nci(hdev); + struct nci_conn_info *conn_info; + struct nci_data data; + int r; + u8 pipe = hdev->gate2pipe[gate]; + + pr_debug("idx=%d to gate %d\n", idx, gate); + + if (pipe == ST21NFCB_HCI_INVALID_PIPE) + return -EADDRNOTAVAIL; + + list_for_each_entry(conn_info, &ndev->conn_info_list, list) { + if (conn_info->id == NCI_NFCEE_ID_HCI) + break; + } + + if (!conn_info || conn_info->id != NCI_NFCEE_ID_HCI) + return -EPROTO; + + data.conn_id = conn_info->conn_id; + data.pipe = pipe; + data.cmd = ST21NFCB_HCP_HEADER(ST21NFCB_HCI_HCP_COMMAND, + ST21NFCB_HCI_ANY_GET_PARAMETER); + data.data = &idx; + data.data_len = 1; + + r = nci_request(ndev, st21nfcb_hci_send_data_req, (unsigned long)&data, + msecs_to_jiffies(NCI_DATA_TIMEOUT)); + + if (r == NCI_STATUS_OK) + *skb = conn_info->rx_skb; + + return r; +} +EXPORT_SYMBOL(st21nfcb_hci_get_param); + +int st21nfcb_hci_connect_gate(struct st21nfcb_hci_dev *hdev, + u8 dest_host, u8 dest_gate, u8 pipe) +{ + int r; + + if (pipe == ST21NFCB_HCI_DO_NOT_OPEN_PIPE) + return 0; + + if (hdev->gate2pipe[dest_gate] != ST21NFCB_HCI_INVALID_PIPE) + return -EADDRINUSE; + + if (pipe != ST21NFCB_HCI_INVALID_PIPE) + goto open_pipe; + + switch (dest_gate) { + case ST21NFCB_HCI_LINK_MGMT_GATE: + pipe = ST21NFCB_HCI_LINK_MGMT_PIPE; + break; + case ST21NFCB_HCI_ADMIN_GATE: + pipe = ST21NFCB_HCI_ADMIN_PIPE; + break; + } + +open_pipe: + r = st21nfcb_hci_open_pipe(hdev, pipe); + if (r < 0) + return r; + + hdev->pipes[pipe].gate = dest_gate; + hdev->pipes[pipe].host = dest_host; + hdev->gate2pipe[dest_gate] = pipe; + + return 0; +} +EXPORT_SYMBOL(st21nfcb_hci_connect_gate); + +static int st21nfcb_hci_dev_connect_gates(struct st21nfcb_hci_dev *hdev, + u8 gate_count, + struct st21nfcb_hci_gate *gates) +{ + int r; + + while (gate_count--) { + r = st21nfcb_hci_connect_gate(hdev, ST21NFCB_HOST_CONTROLLER_ID, + gates->gate, gates->pipe); + if (r < 0) + return r; + gates++; + } + + return 0; +} + +static int st21nfcb_hci_dev_session_init(struct st21nfcb_hci_dev *hdev, + const char *session_id) +{ + struct sk_buff *skb; + int r, dev_num; + + hdev->count_pipes = 0; + hdev->expected_pipes = 0; + + /* + * Session id must include the driver name + i2c bus addr + * persistent info to discriminate 2 identical chips + */ + dev_num = find_first_zero_bit(dev_mask, ST21NFCB_NUM_DEVICES); + if (dev_num >= ST21NFCB_NUM_DEVICES) + return -ENODEV; + + scnprintf(hdev->init_data.session_id, + sizeof(hdev->init_data.session_id), "%s%2x", session_id, + dev_num); + + if (hdev->init_data.gates[0].gate != ST21NFCB_HCI_ADMIN_GATE) + return -EPROTO; + + r = st21nfcb_hci_connect_gate(hdev, ST21NFCB_HOST_CONTROLLER_ID, + hdev->init_data.gates[0].gate, + hdev->init_data.gates[0].pipe); + if (r < 0) + goto exit; + + r = st21nfcb_hci_get_param(hdev, ST21NFCB_HCI_ADMIN_GATE, + ST21NFCB_HCI_ADMIN_PARAM_SESSION_IDENTITY, + &skb); + if (r < 0) + goto exit; + + if (skb->len && skb->len == strlen(hdev->init_data.session_id) && + memcmp(hdev->init_data.session_id, skb->data, skb->len) == 0 && + hdev->ops->load_session) { + /* Restore gate<->pipe table from some proprietary location. */ + r = hdev->ops->load_session(hdev); + if (r < 0) + goto exit; + } else { + r = st21nfcb_hci_dev_connect_gates(hdev, + hdev->init_data.gate_count, + hdev->init_data.gates); + if (r < 0) + goto exit; + + r = st21nfcb_hci_set_param(hdev, ST21NFCB_HCI_ADMIN_GATE, + ST21NFCB_HCI_ADMIN_PARAM_SESSION_IDENTITY, + hdev->init_data.session_id, + strlen(hdev->init_data.session_id)); + } + if (r == 0) + goto exit; + +exit: + kfree_skb(skb); + + return r; +} + +struct st21nfcb_hci_dev *st21nfcb_hci_allocate(struct nci_dev *ndev, + struct st21nfcb_hci_ops *ops, + const char *session_id, + struct st21nfcb_hci_gate *gates, + int gates_len) +{ + struct st21nfcb_hci_dev *hdev; + struct core_conn_create_dest_spec_params dest_params; + struct nci_conn_info *conn_info; + int r; + + hdev = kzalloc(sizeof(struct st21nfcb_hci_dev), GFP_KERNEL); + if (!hdev) + return NULL; + + r = nci_nfcee_discover(ndev, NCI_NFCEE_DISCOVERY_ACTION_ENABLE); + if (r != NCI_STATUS_OK) + goto exit; + + dest_params.type = NCI_DESTINATION_SPECIFIC_PARAM_NFCEE_TYPE; + dest_params.length = sizeof(struct dest_spec_params); + dest_params.value.id = NCI_NFCEE_ID_HCI; + dest_params.value.protocol = NCI_NFCEE_INTERFACE_HCI_ACCESS; + r = nci_core_conn_create(ndev, &dest_params); + if (r != NCI_STATUS_OK) + goto exit; + + list_for_each_entry(conn_info, &ndev->conn_info_list, list) { + if (conn_info->id == NCI_NFCEE_ID_HCI) + break; + } + + if (!conn_info || conn_info->id != NCI_NFCEE_ID_HCI) + goto exit; + + conn_info->data_exchange_cb = st21nfcb_hci_data_received_cb; + conn_info->data_exchange_cb_context = hdev; + + hdev->ndev = ndev; + hdev->ops = ops; + + skb_queue_head_init(&hdev->rx_hcp_frags); + INIT_WORK(&hdev->msg_rx_work, st21nfcb_hci_msg_rx_work); + skb_queue_head_init(&hdev->msg_rx_queue); + + memcpy(hdev->init_data.gates, gates, gates_len); + + st21nfcb_hci_reset_pipes(hdev); + r = st21nfcb_hci_dev_session_init(hdev, "ST21BH"); + if (r != ST21NFCB_HCI_ANY_OK) + goto exit; + + r = nci_nfcee_mode_set(ndev, NCI_NFCEE_ID_HCI, NCI_NFCEE_ENABLE); + if (r != NCI_STATUS_OK) + goto exit; + + return hdev; + +exit: + kfree(hdev); + return NULL; +} +EXPORT_SYMBOL(st21nfcb_hci_allocate); + +void st21nfcb_hci_free(struct st21nfcb_hci_dev *hdev) +{ + struct nci_conn_info *conn_info; + + list_for_each_entry(conn_info, &hdev->ndev->conn_info_list, list) { + if (conn_info->id == NCI_NFCEE_ID_HCI) + break; + } + + if (!conn_info || conn_info->id != NCI_NFCEE_ID_HCI) + return; + + nci_core_conn_close(hdev->ndev, conn_info->conn_id); + kfree(hdev); +} +EXPORT_SYMBOL(st21nfcb_hci_free); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION(DRIVER_DESC); diff --git a/drivers/nfc/st21nfcb/st21nfcb_hci_core.h b/drivers/nfc/st21nfcb/st21nfcb_hci_core.h new file mode 100644 index 0000000..fa468b4 --- /dev/null +++ b/drivers/nfc/st21nfcb/st21nfcb_hci_core.h @@ -0,0 +1,134 @@ +/* + * NCI based Driver for STMicroelectronics NFC Chip + * + * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions 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, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __LOCAL_ST21NFCB_HCI_CORE_H_ +#define __LOCAL_ST21NFCB_HCI_CORE_H_ + +#define ST21NFCB_HCI_ANY_OPEN_PIPE 0x03 + +/* Hosts */ +#define ST21NFCB_HOST_CONTROLLER_ID 0x00 +#define ST21NFCB_TERMINAL_HOST_ID 0x01 +#define ST21NFCB_UICC_HOST_ID 0x02 +#define ST21NFCB_ESE_HOST_ID 0xc0 + +/* Gates */ +#define ST21NFCB_HCI_ADMIN_GATE 0x00 +#define ST21NFCB_DEVICE_MGNT_GATE 0x01 +#define ST21NFCB_HCI_LINK_MGMT_GATE 0x06 +#define ST21NFCB_APDU_READER_GATE 0xf0 +#define ST21NFCB_CONNECTIVITY_GATE 0x41 + +/* Pipes */ +#define ST21NFCB_HCI_LINK_MGMT_PIPE 0x00 +#define ST21NFCB_HCI_ADMIN_PIPE 0x01 +#define ST21NFCB_DEVICE_MGNT_PIPE 0x02 + +/* Generic responses */ +#define ST21NFCB_HCI_ANY_OK 0x00 +#define ST21NFCB_HCI_ANY_E_NOT_CONNECTED 0x01 +#define ST21NFCB_HCI_ANY_E_CMD_PAR_UNKNOWN 0x02 +#define ST21NFCB_HCI_ANY_E_NOK 0x03 +#define ST21NFCB_HCI_ANY_E_PIPES_FULL 0x04 +#define ST21NFCB_HCI_ANY_E_REG_PAR_UNKNOWN 0x05 +#define ST21NFCB_HCI_ANY_E_PIPE_NOT_OPENED 0x06 +#define ST21NFCB_HCI_ANY_E_CMD_NOT_SUPPORTED 0x07 +#define ST21NFCB_HCI_ANY_E_INHIBITED 0x08 +#define ST21NFCB_HCI_ANY_E_TIMEOUT 0x09 +#define ST21NFCB_HCI_ANY_E_REG_ACCESS_DENIED 0x0a +#define ST21NFCB_HCI_ANY_E_PIPE_ACCESS_DENIED 0x0b + +#define ST21NFCB_HCI_DO_NOT_OPEN_PIPE 0x81 +#define ST21NFCB_HCI_INVALID_PIPE 0x80 +#define ST21NFCB_HCI_INVALID_GATE 0xFF +#define ST21NFCB_HCI_INVALID_HOST 0x80 + +#define ST21NFCB_HCI_MAX_CUSTOM_GATES 50 +#define ST21NFCB_HCI_MAX_PIPES 127 + +struct st21nfcb_hci_gate { + u8 gate; + u8 pipe; +} __packed; + +struct st21nfcb_hci_pipe { + u8 gate; + u8 host; +} __packed; + +struct st21nfcb_hci_init_data { + u8 gate_count; + struct st21nfcb_hci_gate gates[ST21NFCB_HCI_MAX_CUSTOM_GATES]; + char session_id[9]; +}; + +#define ST21NFCB_HCI_MAX_GATES 256 + +struct st21nfcb_hci_dev { + struct nci_dev *ndev; + + struct st21nfcb_hci_init_data init_data; + struct st21nfcb_hci_pipe pipes[ST21NFCB_HCI_MAX_PIPES]; + u8 gate2pipe[ST21NFCB_HCI_MAX_GATES]; + int expected_pipes; + int count_pipes; + + struct sk_buff_head rx_hcp_frags; + struct work_struct msg_rx_work; + struct sk_buff_head msg_rx_queue; + + struct st21nfcb_hci_ops *ops; +}; + +struct st21nfcb_hci_ops { + int (*load_session)(struct st21nfcb_hci_dev *hdev); + void (*event_received)(struct st21nfcb_hci_dev *hdev, u8 pipe, u8 event, + struct sk_buff *skb); + void (*cmd_received)(struct st21nfcb_hci_dev *ndev, u8 pipe, u8 cmd, + struct sk_buff *skb); +}; + +static inline struct nci_dev *st21nfcb_hci_get_nci(struct st21nfcb_hci_dev *hdev) +{ + return hdev->ndev; +} + +int st21nfcb_hci_send_event(struct st21nfcb_hci_dev *hdev, u8 gate, u8 event, + const u8 *param, size_t param_len); +int st21nfcb_hci_send_cmd(struct st21nfcb_hci_dev *hdev, u8 gate, + u8 cmd, const u8 *param, size_t param_len, + struct sk_buff **skb); +int st21nfcb_hci_send_response(struct st21nfcb_hci_dev *hdev, u8 pipe, + u8 cmd, const u8 *param, size_t param_len); + +int st21nfcb_hci_open_pipe(struct st21nfcb_hci_dev *hdev, u8 pipe); +int st21nfcb_hci_connect_gate(struct st21nfcb_hci_dev *hdev, + u8 dest_host, u8 dest_gate, u8 pipe); +int st21nfcb_hci_set_param(struct st21nfcb_hci_dev *hdev, u8 gate, u8 idx, + const u8 *param, size_t param_len); +int st21nfcb_hci_get_param(struct st21nfcb_hci_dev *hdev, u8 gate, u8 idx, + struct sk_buff **skb); + +struct st21nfcb_hci_dev *st21nfcb_hci_allocate(struct nci_dev *ndev, + struct st21nfcb_hci_ops *ops, + const char *session_id, + struct st21nfcb_hci_gate *gates, + int gates_len); +void st21nfcb_hci_free(struct st21nfcb_hci_dev *hdev); + +#endif /* __LOCAL_ST21NFCB_HCI_CORE_H_ */ -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
