| /* |
| * The NFC Controller Interface is the communication protocol between an |
| * NFC Controller (NFCC) and a Device Host (DH). |
| * |
| * Copyright (C) 2011 Texas Instruments, Inc. |
| * |
| * Written by Ilan Elias <ilane@ti.com> |
| * |
| * Acknowledgements: |
| * This file is based on hci_core.c, which was written |
| * by Maxim Krasnyansky. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms 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/>. |
| * |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ |
| |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/workqueue.h> |
| #include <linux/completion.h> |
| #include <linux/export.h> |
| #include <linux/sched.h> |
| #include <linux/bitops.h> |
| #include <linux/skbuff.h> |
| |
| #include "../nfc.h" |
| #include <net/nfc/nci.h> |
| #include <net/nfc/nci_core.h> |
| #include <linux/nfc.h> |
| |
| static void nci_cmd_work(struct work_struct *work); |
| static void nci_rx_work(struct work_struct *work); |
| static void nci_tx_work(struct work_struct *work); |
| |
| /* ---- NCI requests ---- */ |
| |
| void nci_req_complete(struct nci_dev *ndev, int result) |
| { |
| if (ndev->req_status == NCI_REQ_PEND) { |
| ndev->req_result = result; |
| ndev->req_status = NCI_REQ_DONE; |
| complete(&ndev->req_completion); |
| } |
| } |
| |
| static void nci_req_cancel(struct nci_dev *ndev, int err) |
| { |
| if (ndev->req_status == NCI_REQ_PEND) { |
| ndev->req_result = err; |
| ndev->req_status = NCI_REQ_CANCELED; |
| complete(&ndev->req_completion); |
| } |
| } |
| |
| /* Execute request and wait for completion. */ |
| static int __nci_request(struct nci_dev *ndev, |
| void (*req)(struct nci_dev *ndev, unsigned long opt), |
| unsigned long opt, __u32 timeout) |
| { |
| int rc = 0; |
| long completion_rc; |
| |
| ndev->req_status = NCI_REQ_PEND; |
| |
| init_completion(&ndev->req_completion); |
| req(ndev, opt); |
| completion_rc = |
| wait_for_completion_interruptible_timeout(&ndev->req_completion, |
| timeout); |
| |
| pr_debug("wait_for_completion return %ld\n", completion_rc); |
| |
| if (completion_rc > 0) { |
| switch (ndev->req_status) { |
| case NCI_REQ_DONE: |
| rc = nci_to_errno(ndev->req_result); |
| break; |
| |
| case NCI_REQ_CANCELED: |
| rc = -ndev->req_result; |
| break; |
| |
| default: |
| rc = -ETIMEDOUT; |
| break; |
| } |
| } else { |
| pr_err("wait_for_completion_interruptible_timeout failed %ld\n", |
| completion_rc); |
| |
| rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc)); |
| } |
| |
| ndev->req_status = ndev->req_result = 0; |
| |
| return rc; |
| } |
| |
| static inline int nci_request(struct nci_dev *ndev, |
| void (*req)(struct nci_dev *ndev, |
| unsigned long opt), |
| unsigned long opt, __u32 timeout) |
| { |
| int rc; |
| |
| if (!test_bit(NCI_UP, &ndev->flags)) |
| return -ENETDOWN; |
| |
| /* Serialize all requests */ |
| mutex_lock(&ndev->req_lock); |
| rc = __nci_request(ndev, req, opt, timeout); |
| mutex_unlock(&ndev->req_lock); |
| |
| return rc; |
| } |
| |
| static void nci_reset_req(struct nci_dev *ndev, unsigned long opt) |
| { |
| struct nci_core_reset_cmd cmd; |
| |
| cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG; |
| nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd); |
| } |
| |
| static void nci_init_req(struct nci_dev *ndev, unsigned long opt) |
| { |
| nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL); |
| } |
| |
| static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt) |
| { |
| struct nci_rf_disc_map_cmd cmd; |
| struct disc_map_config *cfg = cmd.mapping_configs; |
| __u8 *num = &cmd.num_mapping_configs; |
| int i; |
| |
| /* set rf mapping configurations */ |
| *num = 0; |
| |
| /* by default mapping is set to NCI_RF_INTERFACE_FRAME */ |
| for (i = 0; i < ndev->num_supported_rf_interfaces; i++) { |
| if (ndev->supported_rf_interfaces[i] == |
| NCI_RF_INTERFACE_ISO_DEP) { |
| cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; |
| cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | |
| NCI_DISC_MAP_MODE_LISTEN; |
| cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP; |
| (*num)++; |
| } else if (ndev->supported_rf_interfaces[i] == |
| NCI_RF_INTERFACE_NFC_DEP) { |
| cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; |
| cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | |
| NCI_DISC_MAP_MODE_LISTEN; |
| cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP; |
| (*num)++; |
| } |
| |
| if (*num == NCI_MAX_NUM_MAPPING_CONFIGS) |
| break; |
| } |
| |
| nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD, |
| (1 + ((*num) * sizeof(struct disc_map_config))), &cmd); |
| } |
| |
| struct nci_set_config_param { |
| __u8 id; |
| size_t len; |
| __u8 *val; |
| }; |
| |
| static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt) |
| { |
| struct nci_set_config_param *param = (struct nci_set_config_param *)opt; |
| struct nci_core_set_config_cmd cmd; |
| |
| BUG_ON(param->len > NCI_MAX_PARAM_LEN); |
| |
| cmd.num_params = 1; |
| cmd.param.id = param->id; |
| cmd.param.len = param->len; |
| memcpy(cmd.param.val, param->val, param->len); |
| |
| nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd); |
| } |
| |
| static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt) |
| { |
| struct nci_rf_disc_cmd cmd; |
| __u32 protocols = opt; |
| |
| cmd.num_disc_configs = 0; |
| |
| if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && |
| (protocols & NFC_PROTO_JEWEL_MASK || |
| protocols & NFC_PROTO_MIFARE_MASK || |
| protocols & NFC_PROTO_ISO14443_MASK || |
| protocols & NFC_PROTO_NFC_DEP_MASK)) { |
| cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = |
| NCI_NFC_A_PASSIVE_POLL_MODE; |
| cmd.disc_configs[cmd.num_disc_configs].frequency = 1; |
| cmd.num_disc_configs++; |
| } |
| |
| if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && |
| (protocols & NFC_PROTO_ISO14443_B_MASK)) { |
| cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = |
| NCI_NFC_B_PASSIVE_POLL_MODE; |
| cmd.disc_configs[cmd.num_disc_configs].frequency = 1; |
| cmd.num_disc_configs++; |
| } |
| |
| if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && |
| (protocols & NFC_PROTO_FELICA_MASK || |
| protocols & NFC_PROTO_NFC_DEP_MASK)) { |
| cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = |
| NCI_NFC_F_PASSIVE_POLL_MODE; |
| cmd.disc_configs[cmd.num_disc_configs].frequency = 1; |
| cmd.num_disc_configs++; |
| } |
| |
| nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD, |
| (1 + (cmd.num_disc_configs * sizeof(struct disc_config))), |
| &cmd); |
| } |
| |
| struct nci_rf_discover_select_param { |
| __u8 rf_discovery_id; |
| __u8 rf_protocol; |
| }; |
| |
| static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt) |
| { |
| struct nci_rf_discover_select_param *param = |
| (struct nci_rf_discover_select_param *)opt; |
| struct nci_rf_discover_select_cmd cmd; |
| |
| cmd.rf_discovery_id = param->rf_discovery_id; |
| cmd.rf_protocol = param->rf_protocol; |
| |
| switch (cmd.rf_protocol) { |
| case NCI_RF_PROTOCOL_ISO_DEP: |
| cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP; |
| break; |
| |
| case NCI_RF_PROTOCOL_NFC_DEP: |
| cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP; |
| break; |
| |
| default: |
| cmd.rf_interface = NCI_RF_INTERFACE_FRAME; |
| break; |
| } |
| |
| nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD, |
| sizeof(struct nci_rf_discover_select_cmd), &cmd); |
| } |
| |
| static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt) |
| { |
| struct nci_rf_deactivate_cmd cmd; |
| |
| cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE; |
| |
| nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD, |
| sizeof(struct nci_rf_deactivate_cmd), &cmd); |
| } |
| |
| static int nci_open_device(struct nci_dev *ndev) |
| { |
| int rc = 0; |
| |
| mutex_lock(&ndev->req_lock); |
| |
| if (test_bit(NCI_UP, &ndev->flags)) { |
| rc = -EALREADY; |
| goto done; |
| } |
| |
| if (ndev->ops->open(ndev)) { |
| rc = -EIO; |
| goto done; |
| } |
| |
| atomic_set(&ndev->cmd_cnt, 1); |
| |
| set_bit(NCI_INIT, &ndev->flags); |
| |
| rc = __nci_request(ndev, nci_reset_req, 0, |
| msecs_to_jiffies(NCI_RESET_TIMEOUT)); |
| |
| if (!rc) { |
| rc = __nci_request(ndev, nci_init_req, 0, |
| msecs_to_jiffies(NCI_INIT_TIMEOUT)); |
| } |
| |
| if (!rc) { |
| rc = __nci_request(ndev, nci_init_complete_req, 0, |
| msecs_to_jiffies(NCI_INIT_TIMEOUT)); |
| } |
| |
| clear_bit(NCI_INIT, &ndev->flags); |
| |
| if (!rc) { |
| set_bit(NCI_UP, &ndev->flags); |
| nci_clear_target_list(ndev); |
| atomic_set(&ndev->state, NCI_IDLE); |
| } else { |
| /* Init failed, cleanup */ |
| skb_queue_purge(&ndev->cmd_q); |
| skb_queue_purge(&ndev->rx_q); |
| skb_queue_purge(&ndev->tx_q); |
| |
| ndev->ops->close(ndev); |
| ndev->flags = 0; |
| } |
| |
| done: |
| mutex_unlock(&ndev->req_lock); |
| return rc; |
| } |
| |
| static int nci_close_device(struct nci_dev *ndev) |
| { |
| nci_req_cancel(ndev, ENODEV); |
| mutex_lock(&ndev->req_lock); |
| |
| if (!test_and_clear_bit(NCI_UP, &ndev->flags)) { |
| del_timer_sync(&ndev->cmd_timer); |
| del_timer_sync(&ndev->data_timer); |
| mutex_unlock(&ndev->req_lock); |
| return 0; |
| } |
| |
| /* Drop RX and TX queues */ |
| skb_queue_purge(&ndev->rx_q); |
| skb_queue_purge(&ndev->tx_q); |
| |
| /* Flush RX and TX wq */ |
| flush_workqueue(ndev->rx_wq); |
| flush_workqueue(ndev->tx_wq); |
| |
| /* Reset device */ |
| skb_queue_purge(&ndev->cmd_q); |
| atomic_set(&ndev->cmd_cnt, 1); |
| |
| set_bit(NCI_INIT, &ndev->flags); |
| __nci_request(ndev, nci_reset_req, 0, |
| msecs_to_jiffies(NCI_RESET_TIMEOUT)); |
| clear_bit(NCI_INIT, &ndev->flags); |
| |
| /* 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; |
| |
| mutex_unlock(&ndev->req_lock); |
| |
| return 0; |
| } |
| |
| /* NCI command timer function */ |
| static void nci_cmd_timer(unsigned long arg) |
| { |
| struct nci_dev *ndev = (void *) arg; |
| |
| atomic_set(&ndev->cmd_cnt, 1); |
| queue_work(ndev->cmd_wq, &ndev->cmd_work); |
| } |
| |
| /* NCI data exchange timer function */ |
| static void nci_data_timer(unsigned long arg) |
| { |
| struct nci_dev *ndev = (void *) arg; |
| |
| set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); |
| queue_work(ndev->rx_wq, &ndev->rx_work); |
| } |
| |
| static int nci_dev_up(struct nfc_dev *nfc_dev) |
| { |
| struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); |
| |
| return nci_open_device(ndev); |
| } |
| |
| static int nci_dev_down(struct nfc_dev *nfc_dev) |
| { |
| struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); |
| |
| return nci_close_device(ndev); |
| } |
| |
| static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev) |
| { |
| struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); |
| struct nci_set_config_param param; |
| __u8 local_gb[NFC_MAX_GT_LEN]; |
| int i; |
| |
| param.val = nfc_get_local_general_bytes(nfc_dev, ¶m.len); |
| if ((param.val == NULL) || (param.len == 0)) |
| return 0; |
| |
| if (param.len > NFC_MAX_GT_LEN) |
| return -EINVAL; |
| |
| for (i = 0; i < param.len; i++) |
| local_gb[param.len-1-i] = param.val[i]; |
| |
| param.id = NCI_PN_ATR_REQ_GEN_BYTES; |
| param.val = local_gb; |
| |
| return nci_request(ndev, nci_set_config_req, (unsigned long)¶m, |
| msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); |
| } |
| |
| static int nci_start_poll(struct nfc_dev *nfc_dev, |
| __u32 im_protocols, __u32 tm_protocols) |
| { |
| struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); |
| int rc; |
| |
| if ((atomic_read(&ndev->state) == NCI_DISCOVERY) || |
| (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) { |
| pr_err("unable to start poll, since poll is already active\n"); |
| return -EBUSY; |
| } |
| |
| if (ndev->target_active_prot) { |
| pr_err("there is an active target\n"); |
| return -EBUSY; |
| } |
| |
| if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) || |
| (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) { |
| pr_debug("target active or w4 select, implicitly deactivate\n"); |
| |
| rc = nci_request(ndev, nci_rf_deactivate_req, 0, |
| msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); |
| if (rc) |
| return -EBUSY; |
| } |
| |
| if (im_protocols & NFC_PROTO_NFC_DEP_MASK) { |
| rc = nci_set_local_general_bytes(nfc_dev); |
| if (rc) { |
| pr_err("failed to set local general bytes\n"); |
| return rc; |
| } |
| } |
| |
| rc = nci_request(ndev, nci_rf_discover_req, im_protocols, |
| msecs_to_jiffies(NCI_RF_DISC_TIMEOUT)); |
| |
| if (!rc) |
| ndev->poll_prots = im_protocols; |
| |
| return rc; |
| } |
| |
| static void nci_stop_poll(struct nfc_dev *nfc_dev) |
| { |
| struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); |
| |
| if ((atomic_read(&ndev->state) != NCI_DISCOVERY) && |
| (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"); |