999 lines
23 KiB
C
999 lines
23 KiB
C
/*
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* The NFC Controller Interface is the communication protocol between an
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* NFC Controller (NFCC) and a Device Host (DH).
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*
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* Copyright (C) 2011 Texas Instruments, Inc.
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*
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* Written by Ilan Elias <ilane@ti.com>
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*
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* Acknowledgements:
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* This file is based on hci_core.c, which was written
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* by Maxim Krasnyansky.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/workqueue.h>
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#include <linux/completion.h>
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#include <linux/export.h>
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#include <linux/sched.h>
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#include <linux/bitops.h>
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#include <linux/skbuff.h>
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#include "../nfc.h"
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#include <net/nfc/nci.h>
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#include <net/nfc/nci_core.h>
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#include <linux/nfc.h>
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static void nci_cmd_work(struct work_struct *work);
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static void nci_rx_work(struct work_struct *work);
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static void nci_tx_work(struct work_struct *work);
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/* ---- NCI requests ---- */
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void nci_req_complete(struct nci_dev *ndev, int result)
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{
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if (ndev->req_status == NCI_REQ_PEND) {
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ndev->req_result = result;
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ndev->req_status = NCI_REQ_DONE;
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complete(&ndev->req_completion);
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}
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}
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static void nci_req_cancel(struct nci_dev *ndev, int err)
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{
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if (ndev->req_status == NCI_REQ_PEND) {
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ndev->req_result = err;
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ndev->req_status = NCI_REQ_CANCELED;
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complete(&ndev->req_completion);
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}
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}
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/* Execute request and wait for completion. */
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static int __nci_request(struct nci_dev *ndev,
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void (*req)(struct nci_dev *ndev, unsigned long opt),
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unsigned long opt, __u32 timeout)
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{
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int rc = 0;
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long completion_rc;
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ndev->req_status = NCI_REQ_PEND;
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init_completion(&ndev->req_completion);
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req(ndev, opt);
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completion_rc =
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wait_for_completion_interruptible_timeout(&ndev->req_completion,
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timeout);
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pr_debug("wait_for_completion return %ld\n", completion_rc);
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if (completion_rc > 0) {
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switch (ndev->req_status) {
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case NCI_REQ_DONE:
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rc = nci_to_errno(ndev->req_result);
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break;
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case NCI_REQ_CANCELED:
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rc = -ndev->req_result;
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break;
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default:
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rc = -ETIMEDOUT;
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break;
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}
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} else {
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pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
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completion_rc);
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rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
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}
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ndev->req_status = ndev->req_result = 0;
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return rc;
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}
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static inline int nci_request(struct nci_dev *ndev,
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void (*req)(struct nci_dev *ndev,
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unsigned long opt),
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unsigned long opt, __u32 timeout)
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{
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int rc;
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if (!test_bit(NCI_UP, &ndev->flags))
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return -ENETDOWN;
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/* Serialize all requests */
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mutex_lock(&ndev->req_lock);
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rc = __nci_request(ndev, req, opt, timeout);
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mutex_unlock(&ndev->req_lock);
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return rc;
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}
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static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
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{
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struct nci_core_reset_cmd cmd;
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cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
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nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
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}
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static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
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{
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nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
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}
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static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
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{
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struct nci_rf_disc_map_cmd cmd;
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struct disc_map_config *cfg = cmd.mapping_configs;
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__u8 *num = &cmd.num_mapping_configs;
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int i;
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/* set rf mapping configurations */
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*num = 0;
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/* by default mapping is set to NCI_RF_INTERFACE_FRAME */
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for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
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if (ndev->supported_rf_interfaces[i] ==
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NCI_RF_INTERFACE_ISO_DEP) {
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cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
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cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
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NCI_DISC_MAP_MODE_LISTEN;
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cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP;
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(*num)++;
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} else if (ndev->supported_rf_interfaces[i] ==
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NCI_RF_INTERFACE_NFC_DEP) {
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cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
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cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
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NCI_DISC_MAP_MODE_LISTEN;
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cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP;
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(*num)++;
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}
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if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
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break;
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}
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nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
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(1 + ((*num) * sizeof(struct disc_map_config))), &cmd);
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}
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struct nci_set_config_param {
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__u8 id;
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size_t len;
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__u8 *val;
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};
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static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt)
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{
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struct nci_set_config_param *param = (struct nci_set_config_param *)opt;
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struct nci_core_set_config_cmd cmd;
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BUG_ON(param->len > NCI_MAX_PARAM_LEN);
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cmd.num_params = 1;
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cmd.param.id = param->id;
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cmd.param.len = param->len;
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memcpy(cmd.param.val, param->val, param->len);
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nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd);
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}
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static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
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{
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struct nci_rf_disc_cmd cmd;
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__u32 protocols = opt;
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cmd.num_disc_configs = 0;
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if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
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(protocols & NFC_PROTO_JEWEL_MASK ||
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protocols & NFC_PROTO_MIFARE_MASK ||
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protocols & NFC_PROTO_ISO14443_MASK ||
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protocols & NFC_PROTO_NFC_DEP_MASK)) {
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cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
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NCI_NFC_A_PASSIVE_POLL_MODE;
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cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
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cmd.num_disc_configs++;
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}
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if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
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(protocols & NFC_PROTO_ISO14443_B_MASK)) {
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cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
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NCI_NFC_B_PASSIVE_POLL_MODE;
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cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
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cmd.num_disc_configs++;
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}
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if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
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(protocols & NFC_PROTO_FELICA_MASK ||
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protocols & NFC_PROTO_NFC_DEP_MASK)) {
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cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
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NCI_NFC_F_PASSIVE_POLL_MODE;
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cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
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cmd.num_disc_configs++;
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}
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nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
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(1 + (cmd.num_disc_configs * sizeof(struct disc_config))),
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&cmd);
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}
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struct nci_rf_discover_select_param {
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__u8 rf_discovery_id;
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__u8 rf_protocol;
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};
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static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
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{
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struct nci_rf_discover_select_param *param =
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(struct nci_rf_discover_select_param *)opt;
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struct nci_rf_discover_select_cmd cmd;
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cmd.rf_discovery_id = param->rf_discovery_id;
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cmd.rf_protocol = param->rf_protocol;
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switch (cmd.rf_protocol) {
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case NCI_RF_PROTOCOL_ISO_DEP:
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cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
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break;
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case NCI_RF_PROTOCOL_NFC_DEP:
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cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
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break;
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default:
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cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
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break;
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}
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nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
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sizeof(struct nci_rf_discover_select_cmd), &cmd);
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}
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static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
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{
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struct nci_rf_deactivate_cmd cmd;
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cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE;
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nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
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sizeof(struct nci_rf_deactivate_cmd), &cmd);
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}
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static int nci_open_device(struct nci_dev *ndev)
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{
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int rc = 0;
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mutex_lock(&ndev->req_lock);
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if (test_bit(NCI_UP, &ndev->flags)) {
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rc = -EALREADY;
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goto done;
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}
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if (ndev->ops->open(ndev)) {
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rc = -EIO;
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goto done;
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}
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atomic_set(&ndev->cmd_cnt, 1);
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set_bit(NCI_INIT, &ndev->flags);
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rc = __nci_request(ndev, nci_reset_req, 0,
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msecs_to_jiffies(NCI_RESET_TIMEOUT));
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if (ndev->ops->setup)
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ndev->ops->setup(ndev);
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if (!rc) {
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rc = __nci_request(ndev, nci_init_req, 0,
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msecs_to_jiffies(NCI_INIT_TIMEOUT));
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}
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if (!rc) {
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rc = __nci_request(ndev, nci_init_complete_req, 0,
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msecs_to_jiffies(NCI_INIT_TIMEOUT));
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}
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clear_bit(NCI_INIT, &ndev->flags);
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if (!rc) {
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set_bit(NCI_UP, &ndev->flags);
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nci_clear_target_list(ndev);
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atomic_set(&ndev->state, NCI_IDLE);
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} else {
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/* Init failed, cleanup */
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skb_queue_purge(&ndev->cmd_q);
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skb_queue_purge(&ndev->rx_q);
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skb_queue_purge(&ndev->tx_q);
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ndev->ops->close(ndev);
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ndev->flags = 0;
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}
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done:
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mutex_unlock(&ndev->req_lock);
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return rc;
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}
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static int nci_close_device(struct nci_dev *ndev)
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{
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nci_req_cancel(ndev, ENODEV);
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mutex_lock(&ndev->req_lock);
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if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
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del_timer_sync(&ndev->cmd_timer);
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del_timer_sync(&ndev->data_timer);
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mutex_unlock(&ndev->req_lock);
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return 0;
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}
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/* Drop RX and TX queues */
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skb_queue_purge(&ndev->rx_q);
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skb_queue_purge(&ndev->tx_q);
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/* Flush RX and TX wq */
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flush_workqueue(ndev->rx_wq);
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flush_workqueue(ndev->tx_wq);
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/* Reset device */
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skb_queue_purge(&ndev->cmd_q);
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atomic_set(&ndev->cmd_cnt, 1);
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set_bit(NCI_INIT, &ndev->flags);
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__nci_request(ndev, nci_reset_req, 0,
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msecs_to_jiffies(NCI_RESET_TIMEOUT));
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clear_bit(NCI_INIT, &ndev->flags);
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del_timer_sync(&ndev->cmd_timer);
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/* Flush cmd wq */
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flush_workqueue(ndev->cmd_wq);
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/* After this point our queues are empty
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* and no works are scheduled. */
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ndev->ops->close(ndev);
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/* Clear flags */
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ndev->flags = 0;
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mutex_unlock(&ndev->req_lock);
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return 0;
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}
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/* NCI command timer function */
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static void nci_cmd_timer(unsigned long arg)
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{
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struct nci_dev *ndev = (void *) arg;
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atomic_set(&ndev->cmd_cnt, 1);
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queue_work(ndev->cmd_wq, &ndev->cmd_work);
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}
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/* NCI data exchange timer function */
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static void nci_data_timer(unsigned long arg)
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{
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struct nci_dev *ndev = (void *) arg;
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set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
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queue_work(ndev->rx_wq, &ndev->rx_work);
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}
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static int nci_dev_up(struct nfc_dev *nfc_dev)
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{
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struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
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return nci_open_device(ndev);
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}
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static int nci_dev_down(struct nfc_dev *nfc_dev)
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{
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struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
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return nci_close_device(ndev);
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}
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int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, __u8 *val)
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{
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struct nci_set_config_param param;
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if (!val || !len)
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return 0;
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param.id = id;
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param.len = len;
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param.val = val;
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return __nci_request(ndev, nci_set_config_req, (unsigned long)¶m,
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msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
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}
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EXPORT_SYMBOL(nci_set_config);
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static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev)
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{
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struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
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struct nci_set_config_param param;
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param.val = nfc_get_local_general_bytes(nfc_dev, ¶m.len);
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if ((param.val == NULL) || (param.len == 0))
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return 0;
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if (param.len > NFC_MAX_GT_LEN)
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return -EINVAL;
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param.id = NCI_PN_ATR_REQ_GEN_BYTES;
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return nci_request(ndev, nci_set_config_req, (unsigned long)¶m,
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msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
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}
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static int nci_start_poll(struct nfc_dev *nfc_dev,
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__u32 im_protocols, __u32 tm_protocols)
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{
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struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
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int rc;
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if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
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(atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
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pr_err("unable to start poll, since poll is already active\n");
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return -EBUSY;
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}
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if (ndev->target_active_prot) {
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pr_err("there is an active target\n");
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return -EBUSY;
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}
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if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
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(atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
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pr_debug("target active or w4 select, implicitly deactivate\n");
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rc = nci_request(ndev, nci_rf_deactivate_req, 0,
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msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
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if (rc)
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return -EBUSY;
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}
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if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
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rc = nci_set_local_general_bytes(nfc_dev);
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if (rc) {
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pr_err("failed to set local general bytes\n");
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return rc;
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}
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}
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rc = nci_request(ndev, nci_rf_discover_req, im_protocols,
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msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
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if (!rc)
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ndev->poll_prots = im_protocols;
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return rc;
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}
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static void nci_stop_poll(struct nfc_dev *nfc_dev)
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{
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struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
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if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
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(atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
|
|
pr_err("unable to stop poll, since poll is not active\n");
|
|
return;
|
|
}
|
|
|
|
nci_request(ndev, nci_rf_deactivate_req, 0,
|
|
msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
|
|
}
|
|
|
|
static int nci_activate_target(struct nfc_dev *nfc_dev,
|
|
struct nfc_target *target, __u32 protocol)
|
|
{
|
|
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
|
|
struct nci_rf_discover_select_param param;
|
|
struct nfc_target *nci_target = NULL;
|
|
int i;
|
|
int rc = 0;
|
|
|
|
pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
|
|
|
|
if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
|
|
(atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
|
|
pr_err("there is no available target to activate\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (ndev->target_active_prot) {
|
|
pr_err("there is already an active target\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
for (i = 0; i < ndev->n_targets; i++) {
|
|
if (ndev->targets[i].idx == target->idx) {
|
|
nci_target = &ndev->targets[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!nci_target) {
|
|
pr_err("unable to find the selected target\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!(nci_target->supported_protocols & (1 << protocol))) {
|
|
pr_err("target does not support the requested protocol 0x%x\n",
|
|
protocol);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
|
|
param.rf_discovery_id = nci_target->logical_idx;
|
|
|
|
if (protocol == NFC_PROTO_JEWEL)
|
|
param.rf_protocol = NCI_RF_PROTOCOL_T1T;
|
|
else if (protocol == NFC_PROTO_MIFARE)
|
|
param.rf_protocol = NCI_RF_PROTOCOL_T2T;
|
|
else if (protocol == NFC_PROTO_FELICA)
|
|
param.rf_protocol = NCI_RF_PROTOCOL_T3T;
|
|
else if (protocol == NFC_PROTO_ISO14443 ||
|
|
protocol == NFC_PROTO_ISO14443_B)
|
|
param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
|
|
else
|
|
param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
|
|
|
|
rc = nci_request(ndev, nci_rf_discover_select_req,
|
|
(unsigned long)¶m,
|
|
msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
|
|
}
|
|
|
|
if (!rc)
|
|
ndev->target_active_prot = protocol;
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void nci_deactivate_target(struct nfc_dev *nfc_dev,
|
|
struct nfc_target *target)
|
|
{
|
|
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
|
|
|
|
pr_debug("entry\n");
|
|
|
|
if (!ndev->target_active_prot) {
|
|
pr_err("unable to deactivate target, no active target\n");
|
|
return;
|
|
}
|
|
|
|
ndev->target_active_prot = 0;
|
|
|
|
if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
|
|
nci_request(ndev, nci_rf_deactivate_req, 0,
|
|
msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
|
|
}
|
|
}
|
|
|
|
static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
|
|
__u8 comm_mode, __u8 *gb, size_t gb_len)
|
|
{
|
|
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
|
|
int rc;
|
|
|
|
pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode);
|
|
|
|
rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb,
|
|
ndev->remote_gb_len);
|
|
if (!rc)
|
|
rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE,
|
|
NFC_RF_INITIATOR);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int nci_dep_link_down(struct nfc_dev *nfc_dev)
|
|
{
|
|
pr_debug("entry\n");
|
|
|
|
nci_deactivate_target(nfc_dev, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
|
|
struct sk_buff *skb,
|
|
data_exchange_cb_t cb, void *cb_context)
|
|
{
|
|
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
|
|
int rc;
|
|
|
|
pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
|
|
|
|
if (!ndev->target_active_prot) {
|
|
pr_err("unable to exchange data, no active target\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
|
|
return -EBUSY;
|
|
|
|
/* store cb and context to be used on receiving data */
|
|
ndev->data_exchange_cb = cb;
|
|
ndev->data_exchange_cb_context = cb_context;
|
|
|
|
rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
|
|
if (rc)
|
|
clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int nci_discover_se(struct nfc_dev *nfc_dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static struct nfc_ops nci_nfc_ops = {
|
|
.dev_up = nci_dev_up,
|
|
.dev_down = nci_dev_down,
|
|
.start_poll = nci_start_poll,
|
|
.stop_poll = nci_stop_poll,
|
|
.dep_link_up = nci_dep_link_up,
|
|
.dep_link_down = nci_dep_link_down,
|
|
.activate_target = nci_activate_target,
|
|
.deactivate_target = nci_deactivate_target,
|
|
.im_transceive = nci_transceive,
|
|
.enable_se = nci_enable_se,
|
|
.disable_se = nci_disable_se,
|
|
.discover_se = nci_discover_se,
|
|
};
|
|
|
|
/* ---- Interface to NCI drivers ---- */
|
|
|
|
/**
|
|
* nci_allocate_device - allocate a new nci device
|
|
*
|
|
* @ops: device operations
|
|
* @supported_protocols: NFC protocols supported by the device
|
|
*/
|
|
struct nci_dev *nci_allocate_device(struct nci_ops *ops,
|
|
__u32 supported_protocols,
|
|
int tx_headroom, int tx_tailroom)
|
|
{
|
|
struct nci_dev *ndev;
|
|
|
|
pr_debug("supported_protocols 0x%x\n", supported_protocols);
|
|
|
|
if (!ops->open || !ops->close || !ops->send)
|
|
return NULL;
|
|
|
|
if (!supported_protocols)
|
|
return NULL;
|
|
|
|
ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
|
|
if (!ndev)
|
|
return NULL;
|
|
|
|
ndev->ops = ops;
|
|
ndev->tx_headroom = tx_headroom;
|
|
ndev->tx_tailroom = tx_tailroom;
|
|
|
|
ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
|
|
supported_protocols,
|
|
tx_headroom + NCI_DATA_HDR_SIZE,
|
|
tx_tailroom);
|
|
if (!ndev->nfc_dev)
|
|
goto free_exit;
|
|
|
|
nfc_set_drvdata(ndev->nfc_dev, ndev);
|
|
|
|
return ndev;
|
|
|
|
free_exit:
|
|
kfree(ndev);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(nci_allocate_device);
|
|
|
|
/**
|
|
* nci_free_device - deallocate nci device
|
|
*
|
|
* @ndev: The nci device to deallocate
|
|
*/
|
|
void nci_free_device(struct nci_dev *ndev)
|
|
{
|
|
nfc_free_device(ndev->nfc_dev);
|
|
kfree(ndev);
|
|
}
|
|
EXPORT_SYMBOL(nci_free_device);
|
|
|
|
/**
|
|
* nci_register_device - register a nci device in the nfc subsystem
|
|
*
|
|
* @dev: The nci device to register
|
|
*/
|
|
int nci_register_device(struct nci_dev *ndev)
|
|
{
|
|
int rc;
|
|
struct device *dev = &ndev->nfc_dev->dev;
|
|
char name[32];
|
|
|
|
rc = nfc_register_device(ndev->nfc_dev);
|
|
if (rc)
|
|
goto exit;
|
|
|
|
ndev->flags = 0;
|
|
|
|
INIT_WORK(&ndev->cmd_work, nci_cmd_work);
|
|
snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
|
|
ndev->cmd_wq = create_singlethread_workqueue(name);
|
|
if (!ndev->cmd_wq) {
|
|
rc = -ENOMEM;
|
|
goto unreg_exit;
|
|
}
|
|
|
|
INIT_WORK(&ndev->rx_work, nci_rx_work);
|
|
snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
|
|
ndev->rx_wq = create_singlethread_workqueue(name);
|
|
if (!ndev->rx_wq) {
|
|
rc = -ENOMEM;
|
|
goto destroy_cmd_wq_exit;
|
|
}
|
|
|
|
INIT_WORK(&ndev->tx_work, nci_tx_work);
|
|
snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
|
|
ndev->tx_wq = create_singlethread_workqueue(name);
|
|
if (!ndev->tx_wq) {
|
|
rc = -ENOMEM;
|
|
goto destroy_rx_wq_exit;
|
|
}
|
|
|
|
skb_queue_head_init(&ndev->cmd_q);
|
|
skb_queue_head_init(&ndev->rx_q);
|
|
skb_queue_head_init(&ndev->tx_q);
|
|
|
|
setup_timer(&ndev->cmd_timer, nci_cmd_timer,
|
|
(unsigned long) ndev);
|
|
setup_timer(&ndev->data_timer, nci_data_timer,
|
|
(unsigned long) ndev);
|
|
|
|
mutex_init(&ndev->req_lock);
|
|
|
|
goto exit;
|
|
|
|
destroy_rx_wq_exit:
|
|
destroy_workqueue(ndev->rx_wq);
|
|
|
|
destroy_cmd_wq_exit:
|
|
destroy_workqueue(ndev->cmd_wq);
|
|
|
|
unreg_exit:
|
|
nfc_unregister_device(ndev->nfc_dev);
|
|
|
|
exit:
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(nci_register_device);
|
|
|
|
/**
|
|
* nci_unregister_device - unregister a nci device in the nfc subsystem
|
|
*
|
|
* @dev: The nci device to unregister
|
|
*/
|
|
void nci_unregister_device(struct nci_dev *ndev)
|
|
{
|
|
nci_close_device(ndev);
|
|
|
|
destroy_workqueue(ndev->cmd_wq);
|
|
destroy_workqueue(ndev->rx_wq);
|
|
destroy_workqueue(ndev->tx_wq);
|
|
|
|
nfc_unregister_device(ndev->nfc_dev);
|
|
}
|
|
EXPORT_SYMBOL(nci_unregister_device);
|
|
|
|
/**
|
|
* nci_recv_frame - receive frame from NCI drivers
|
|
*
|
|
* @ndev: The nci device
|
|
* @skb: The sk_buff to receive
|
|
*/
|
|
int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
|
|
{
|
|
pr_debug("len %d\n", skb->len);
|
|
|
|
if (!ndev || (!test_bit(NCI_UP, &ndev->flags) &&
|
|
!test_bit(NCI_INIT, &ndev->flags))) {
|
|
kfree_skb(skb);
|
|
return -ENXIO;
|
|
}
|
|
|
|
/* Queue frame for rx worker thread */
|
|
skb_queue_tail(&ndev->rx_q, skb);
|
|
queue_work(ndev->rx_wq, &ndev->rx_work);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(nci_recv_frame);
|
|
|
|
static int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
|
|
{
|
|
pr_debug("len %d\n", skb->len);
|
|
|
|
if (!ndev) {
|
|
kfree_skb(skb);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Get rid of skb owner, prior to sending to the driver. */
|
|
skb_orphan(skb);
|
|
|
|
return ndev->ops->send(ndev, skb);
|
|
}
|
|
|
|
/* Send NCI command */
|
|
int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
|
|
{
|
|
struct nci_ctrl_hdr *hdr;
|
|
struct sk_buff *skb;
|
|
|
|
pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
|
|
|
|
skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
|
|
if (!skb) {
|
|
pr_err("no memory for command\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE);
|
|
hdr->gid = nci_opcode_gid(opcode);
|
|
hdr->oid = nci_opcode_oid(opcode);
|
|
hdr->plen = plen;
|
|
|
|
nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
|
|
nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
|
|
|
|
if (plen)
|
|
memcpy(skb_put(skb, plen), payload, plen);
|
|
|
|
skb_queue_tail(&ndev->cmd_q, skb);
|
|
queue_work(ndev->cmd_wq, &ndev->cmd_work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* ---- NCI TX Data worker thread ---- */
|
|
|
|
static void nci_tx_work(struct work_struct *work)
|
|
{
|
|
struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
|
|
struct sk_buff *skb;
|
|
|
|
pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt));
|
|
|
|
/* Send queued tx data */
|
|
while (atomic_read(&ndev->credits_cnt)) {
|
|
skb = skb_dequeue(&ndev->tx_q);
|
|
if (!skb)
|
|
return;
|
|
|
|
/* Check if data flow control is used */
|
|
if (atomic_read(&ndev->credits_cnt) !=
|
|
NCI_DATA_FLOW_CONTROL_NOT_USED)
|
|
atomic_dec(&ndev->credits_cnt);
|
|
|
|
pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
|
|
nci_pbf(skb->data),
|
|
nci_conn_id(skb->data),
|
|
nci_plen(skb->data));
|
|
|
|
nci_send_frame(ndev, skb);
|
|
|
|
mod_timer(&ndev->data_timer,
|
|
jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
|
|
}
|
|
}
|
|
|
|
/* ----- NCI RX worker thread (data & control) ----- */
|
|
|
|
static void nci_rx_work(struct work_struct *work)
|
|
{
|
|
struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
|
|
struct sk_buff *skb;
|
|
|
|
while ((skb = skb_dequeue(&ndev->rx_q))) {
|
|
/* Process frame */
|
|
switch (nci_mt(skb->data)) {
|
|
case NCI_MT_RSP_PKT:
|
|
nci_rsp_packet(ndev, skb);
|
|
break;
|
|
|
|
case NCI_MT_NTF_PKT:
|
|
nci_ntf_packet(ndev, skb);
|
|
break;
|
|
|
|
case NCI_MT_DATA_PKT:
|
|
nci_rx_data_packet(ndev, skb);
|
|
break;
|
|
|
|
default:
|
|
pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
|
|
kfree_skb(skb);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* check if a data exchange timout has occurred */
|
|
if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
|
|
/* complete the data exchange transaction, if exists */
|
|
if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
|
|
nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT);
|
|
|
|
clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
|
|
}
|
|
}
|
|
|
|
/* ----- NCI TX CMD worker thread ----- */
|
|
|
|
static void nci_cmd_work(struct work_struct *work)
|
|
{
|
|
struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
|
|
struct sk_buff *skb;
|
|
|
|
pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
|
|
|
|
/* Send queued command */
|
|
if (atomic_read(&ndev->cmd_cnt)) {
|
|
skb = skb_dequeue(&ndev->cmd_q);
|
|
if (!skb)
|
|
return;
|
|
|
|
atomic_dec(&ndev->cmd_cnt);
|
|
|
|
pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
|
|
nci_pbf(skb->data),
|
|
nci_opcode_gid(nci_opcode(skb->data)),
|
|
nci_opcode_oid(nci_opcode(skb->data)),
|
|
nci_plen(skb->data));
|
|
|
|
nci_send_frame(ndev, skb);
|
|
|
|
mod_timer(&ndev->cmd_timer,
|
|
jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
|
|
}
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|