16a2968aaSIlan Elias /* 26a2968aaSIlan Elias * The NFC Controller Interface is the communication protocol between an 36a2968aaSIlan Elias * NFC Controller (NFCC) and a Device Host (DH). 46a2968aaSIlan Elias * 56a2968aaSIlan Elias * Copyright (C) 2011 Texas Instruments, Inc. 66a2968aaSIlan Elias * 76a2968aaSIlan Elias * Written by Ilan Elias <ilane@ti.com> 86a2968aaSIlan Elias * 96a2968aaSIlan Elias * Acknowledgements: 106a2968aaSIlan Elias * This file is based on hci_core.c, which was written 116a2968aaSIlan Elias * by Maxim Krasnyansky. 126a2968aaSIlan Elias * 136a2968aaSIlan Elias * This program is free software; you can redistribute it and/or modify 146a2968aaSIlan Elias * it under the terms of the GNU General Public License version 2 156a2968aaSIlan Elias * as published by the Free Software Foundation 166a2968aaSIlan Elias * 176a2968aaSIlan Elias * This program is distributed in the hope that it will be useful, 186a2968aaSIlan Elias * but WITHOUT ANY WARRANTY; without even the implied warranty of 196a2968aaSIlan Elias * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 206a2968aaSIlan Elias * GNU General Public License for more details. 216a2968aaSIlan Elias * 226a2968aaSIlan Elias * You should have received a copy of the GNU General Public License 2398b32decSJeff Kirsher * along with this program; if not, see <http://www.gnu.org/licenses/>. 246a2968aaSIlan Elias * 256a2968aaSIlan Elias */ 266a2968aaSIlan Elias 2752858b51SSamuel Ortiz #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ 28ed1e0ad8SJoe Perches 298a70e7f8SDave Jones #include <linux/module.h> 306a2968aaSIlan Elias #include <linux/types.h> 316a2968aaSIlan Elias #include <linux/workqueue.h> 326a2968aaSIlan Elias #include <linux/completion.h> 33bc3b2d7fSPaul Gortmaker #include <linux/export.h> 346a2968aaSIlan Elias #include <linux/sched.h> 356a2968aaSIlan Elias #include <linux/bitops.h> 366a2968aaSIlan Elias #include <linux/skbuff.h> 376a2968aaSIlan Elias 386a2968aaSIlan Elias #include "../nfc.h" 396a2968aaSIlan Elias #include <net/nfc/nci.h> 406a2968aaSIlan Elias #include <net/nfc/nci_core.h> 416a2968aaSIlan Elias #include <linux/nfc.h> 426a2968aaSIlan Elias 436a2968aaSIlan Elias static void nci_cmd_work(struct work_struct *work); 446a2968aaSIlan Elias static void nci_rx_work(struct work_struct *work); 456a2968aaSIlan Elias static void nci_tx_work(struct work_struct *work); 466a2968aaSIlan Elias 476a2968aaSIlan Elias /* ---- NCI requests ---- */ 486a2968aaSIlan Elias 496a2968aaSIlan Elias void nci_req_complete(struct nci_dev *ndev, int result) 506a2968aaSIlan Elias { 516a2968aaSIlan Elias if (ndev->req_status == NCI_REQ_PEND) { 526a2968aaSIlan Elias ndev->req_result = result; 536a2968aaSIlan Elias ndev->req_status = NCI_REQ_DONE; 546a2968aaSIlan Elias complete(&ndev->req_completion); 556a2968aaSIlan Elias } 566a2968aaSIlan Elias } 576a2968aaSIlan Elias 586a2968aaSIlan Elias static void nci_req_cancel(struct nci_dev *ndev, int err) 596a2968aaSIlan Elias { 606a2968aaSIlan Elias if (ndev->req_status == NCI_REQ_PEND) { 616a2968aaSIlan Elias ndev->req_result = err; 626a2968aaSIlan Elias ndev->req_status = NCI_REQ_CANCELED; 636a2968aaSIlan Elias complete(&ndev->req_completion); 646a2968aaSIlan Elias } 656a2968aaSIlan Elias } 666a2968aaSIlan Elias 676a2968aaSIlan Elias /* Execute request and wait for completion. */ 686a2968aaSIlan Elias static int __nci_request(struct nci_dev *ndev, 696a2968aaSIlan Elias void (*req)(struct nci_dev *ndev, unsigned long opt), 70eb9bc6e9SSamuel Ortiz unsigned long opt, __u32 timeout) 716a2968aaSIlan Elias { 726a2968aaSIlan Elias int rc = 0; 73f8c141c3SDan Carpenter long completion_rc; 746a2968aaSIlan Elias 756a2968aaSIlan Elias ndev->req_status = NCI_REQ_PEND; 766a2968aaSIlan Elias 779bec44bfSAxel Lin reinit_completion(&ndev->req_completion); 786a2968aaSIlan Elias req(ndev, opt); 79eb9bc6e9SSamuel Ortiz completion_rc = 80eb9bc6e9SSamuel Ortiz wait_for_completion_interruptible_timeout(&ndev->req_completion, 816a2968aaSIlan Elias timeout); 826a2968aaSIlan Elias 8320c239c1SJoe Perches pr_debug("wait_for_completion return %ld\n", completion_rc); 846a2968aaSIlan Elias 856a2968aaSIlan Elias if (completion_rc > 0) { 866a2968aaSIlan Elias switch (ndev->req_status) { 876a2968aaSIlan Elias case NCI_REQ_DONE: 886a2968aaSIlan Elias rc = nci_to_errno(ndev->req_result); 896a2968aaSIlan Elias break; 906a2968aaSIlan Elias 916a2968aaSIlan Elias case NCI_REQ_CANCELED: 926a2968aaSIlan Elias rc = -ndev->req_result; 936a2968aaSIlan Elias break; 946a2968aaSIlan Elias 956a2968aaSIlan Elias default: 966a2968aaSIlan Elias rc = -ETIMEDOUT; 976a2968aaSIlan Elias break; 986a2968aaSIlan Elias } 996a2968aaSIlan Elias } else { 100ed1e0ad8SJoe Perches pr_err("wait_for_completion_interruptible_timeout failed %ld\n", 1016a2968aaSIlan Elias completion_rc); 1026a2968aaSIlan Elias 1036a2968aaSIlan Elias rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc)); 1046a2968aaSIlan Elias } 1056a2968aaSIlan Elias 1066a2968aaSIlan Elias ndev->req_status = ndev->req_result = 0; 1076a2968aaSIlan Elias 1086a2968aaSIlan Elias return rc; 1096a2968aaSIlan Elias } 1106a2968aaSIlan Elias 1116a2968aaSIlan Elias static inline int nci_request(struct nci_dev *ndev, 112eb9bc6e9SSamuel Ortiz void (*req)(struct nci_dev *ndev, 113eb9bc6e9SSamuel Ortiz unsigned long opt), 1146a2968aaSIlan Elias unsigned long opt, __u32 timeout) 1156a2968aaSIlan Elias { 1166a2968aaSIlan Elias int rc; 1176a2968aaSIlan Elias 1186a2968aaSIlan Elias if (!test_bit(NCI_UP, &ndev->flags)) 1196a2968aaSIlan Elias return -ENETDOWN; 1206a2968aaSIlan Elias 1216a2968aaSIlan Elias /* Serialize all requests */ 1226a2968aaSIlan Elias mutex_lock(&ndev->req_lock); 1236a2968aaSIlan Elias rc = __nci_request(ndev, req, opt, timeout); 1246a2968aaSIlan Elias mutex_unlock(&ndev->req_lock); 1256a2968aaSIlan Elias 1266a2968aaSIlan Elias return rc; 1276a2968aaSIlan Elias } 1286a2968aaSIlan Elias 1296a2968aaSIlan Elias static void nci_reset_req(struct nci_dev *ndev, unsigned long opt) 1306a2968aaSIlan Elias { 131e8c0dacdSIlan Elias struct nci_core_reset_cmd cmd; 132e8c0dacdSIlan Elias 133e8c0dacdSIlan Elias cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG; 134e8c0dacdSIlan Elias nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd); 1356a2968aaSIlan Elias } 1366a2968aaSIlan Elias 1376a2968aaSIlan Elias static void nci_init_req(struct nci_dev *ndev, unsigned long opt) 1386a2968aaSIlan Elias { 1396a2968aaSIlan Elias nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL); 1406a2968aaSIlan Elias } 1416a2968aaSIlan Elias 1426a2968aaSIlan Elias static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt) 1436a2968aaSIlan Elias { 1442eb1dc10SIlan Elias struct nci_rf_disc_map_cmd cmd; 1452eb1dc10SIlan Elias struct disc_map_config *cfg = cmd.mapping_configs; 1462eb1dc10SIlan Elias __u8 *num = &cmd.num_mapping_configs; 1476a2968aaSIlan Elias int i; 1486a2968aaSIlan Elias 1496a2968aaSIlan Elias /* set rf mapping configurations */ 1502eb1dc10SIlan Elias *num = 0; 1516a2968aaSIlan Elias 1526a2968aaSIlan Elias /* by default mapping is set to NCI_RF_INTERFACE_FRAME */ 1536a2968aaSIlan Elias for (i = 0; i < ndev->num_supported_rf_interfaces; i++) { 1546a2968aaSIlan Elias if (ndev->supported_rf_interfaces[i] == 1556a2968aaSIlan Elias NCI_RF_INTERFACE_ISO_DEP) { 1562eb1dc10SIlan Elias cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; 157637d85a7SIlan Elias cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | 158637d85a7SIlan Elias NCI_DISC_MAP_MODE_LISTEN; 159637d85a7SIlan Elias cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP; 1602eb1dc10SIlan Elias (*num)++; 1616a2968aaSIlan Elias } else if (ndev->supported_rf_interfaces[i] == 1626a2968aaSIlan Elias NCI_RF_INTERFACE_NFC_DEP) { 1632eb1dc10SIlan Elias cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; 164637d85a7SIlan Elias cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | 165637d85a7SIlan Elias NCI_DISC_MAP_MODE_LISTEN; 166637d85a7SIlan Elias cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP; 1672eb1dc10SIlan Elias (*num)++; 1686a2968aaSIlan Elias } 1696a2968aaSIlan Elias 1702eb1dc10SIlan Elias if (*num == NCI_MAX_NUM_MAPPING_CONFIGS) 1716a2968aaSIlan Elias break; 1726a2968aaSIlan Elias } 1736a2968aaSIlan Elias 1746a2968aaSIlan Elias nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD, 175eb9bc6e9SSamuel Ortiz (1 + ((*num) * sizeof(struct disc_map_config))), &cmd); 1766a2968aaSIlan Elias } 1776a2968aaSIlan Elias 1787e035230SIlan Elias struct nci_set_config_param { 1797e035230SIlan Elias __u8 id; 1807e035230SIlan Elias size_t len; 1817e035230SIlan Elias __u8 *val; 1827e035230SIlan Elias }; 1837e035230SIlan Elias 1847e035230SIlan Elias static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt) 1857e035230SIlan Elias { 1867e035230SIlan Elias struct nci_set_config_param *param = (struct nci_set_config_param *)opt; 1877e035230SIlan Elias struct nci_core_set_config_cmd cmd; 1887e035230SIlan Elias 1897e035230SIlan Elias BUG_ON(param->len > NCI_MAX_PARAM_LEN); 1907e035230SIlan Elias 1917e035230SIlan Elias cmd.num_params = 1; 1927e035230SIlan Elias cmd.param.id = param->id; 1937e035230SIlan Elias cmd.param.len = param->len; 1947e035230SIlan Elias memcpy(cmd.param.val, param->val, param->len); 1957e035230SIlan Elias 1967e035230SIlan Elias nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd); 1977e035230SIlan Elias } 1987e035230SIlan Elias 1996a2968aaSIlan Elias static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt) 2006a2968aaSIlan Elias { 2016a2968aaSIlan Elias struct nci_rf_disc_cmd cmd; 2026a2968aaSIlan Elias __u32 protocols = opt; 2036a2968aaSIlan Elias 2046a2968aaSIlan Elias cmd.num_disc_configs = 0; 2056a2968aaSIlan Elias 2066a2968aaSIlan Elias if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 207874934f4SSzymon Janc (protocols & NFC_PROTO_JEWEL_MASK || 208874934f4SSzymon Janc protocols & NFC_PROTO_MIFARE_MASK || 209874934f4SSzymon Janc protocols & NFC_PROTO_ISO14443_MASK || 210874934f4SSzymon Janc protocols & NFC_PROTO_NFC_DEP_MASK)) { 211637d85a7SIlan Elias cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 212637d85a7SIlan Elias NCI_NFC_A_PASSIVE_POLL_MODE; 2136a2968aaSIlan Elias cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 2146a2968aaSIlan Elias cmd.num_disc_configs++; 2156a2968aaSIlan Elias } 2166a2968aaSIlan Elias 2176a2968aaSIlan Elias if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 21801d719a2SSamuel Ortiz (protocols & NFC_PROTO_ISO14443_B_MASK)) { 219637d85a7SIlan Elias cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 220637d85a7SIlan Elias NCI_NFC_B_PASSIVE_POLL_MODE; 2216a2968aaSIlan Elias cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 2226a2968aaSIlan Elias cmd.num_disc_configs++; 2236a2968aaSIlan Elias } 2246a2968aaSIlan Elias 2256a2968aaSIlan Elias if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 226874934f4SSzymon Janc (protocols & NFC_PROTO_FELICA_MASK || 227874934f4SSzymon Janc protocols & NFC_PROTO_NFC_DEP_MASK)) { 228637d85a7SIlan Elias cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 229637d85a7SIlan Elias NCI_NFC_F_PASSIVE_POLL_MODE; 2306a2968aaSIlan Elias cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 2316a2968aaSIlan Elias cmd.num_disc_configs++; 2326a2968aaSIlan Elias } 2336a2968aaSIlan Elias 234cfdbeeafSVincent Cuissard if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 235cfdbeeafSVincent Cuissard (protocols & NFC_PROTO_ISO15693_MASK)) { 236cfdbeeafSVincent Cuissard cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 237cfdbeeafSVincent Cuissard NCI_NFC_V_PASSIVE_POLL_MODE; 238cfdbeeafSVincent Cuissard cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 239cfdbeeafSVincent Cuissard cmd.num_disc_configs++; 240cfdbeeafSVincent Cuissard } 241cfdbeeafSVincent Cuissard 2426a2968aaSIlan Elias nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD, 2436a2968aaSIlan Elias (1 + (cmd.num_disc_configs * sizeof(struct disc_config))), 2446a2968aaSIlan Elias &cmd); 2456a2968aaSIlan Elias } 2466a2968aaSIlan Elias 247019c4fbaSIlan Elias struct nci_rf_discover_select_param { 248019c4fbaSIlan Elias __u8 rf_discovery_id; 249019c4fbaSIlan Elias __u8 rf_protocol; 250019c4fbaSIlan Elias }; 251019c4fbaSIlan Elias 252019c4fbaSIlan Elias static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt) 253019c4fbaSIlan Elias { 254019c4fbaSIlan Elias struct nci_rf_discover_select_param *param = 255019c4fbaSIlan Elias (struct nci_rf_discover_select_param *)opt; 256019c4fbaSIlan Elias struct nci_rf_discover_select_cmd cmd; 257019c4fbaSIlan Elias 258019c4fbaSIlan Elias cmd.rf_discovery_id = param->rf_discovery_id; 259019c4fbaSIlan Elias cmd.rf_protocol = param->rf_protocol; 260019c4fbaSIlan Elias 261019c4fbaSIlan Elias switch (cmd.rf_protocol) { 262019c4fbaSIlan Elias case NCI_RF_PROTOCOL_ISO_DEP: 263019c4fbaSIlan Elias cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP; 264019c4fbaSIlan Elias break; 265019c4fbaSIlan Elias 266019c4fbaSIlan Elias case NCI_RF_PROTOCOL_NFC_DEP: 267019c4fbaSIlan Elias cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP; 268019c4fbaSIlan Elias break; 269019c4fbaSIlan Elias 270019c4fbaSIlan Elias default: 271019c4fbaSIlan Elias cmd.rf_interface = NCI_RF_INTERFACE_FRAME; 272019c4fbaSIlan Elias break; 273019c4fbaSIlan Elias } 274019c4fbaSIlan Elias 275019c4fbaSIlan Elias nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD, 276eb9bc6e9SSamuel Ortiz sizeof(struct nci_rf_discover_select_cmd), &cmd); 277019c4fbaSIlan Elias } 278019c4fbaSIlan Elias 2796a2968aaSIlan Elias static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt) 2806a2968aaSIlan Elias { 2816a2968aaSIlan Elias struct nci_rf_deactivate_cmd cmd; 2826a2968aaSIlan Elias 2836a2968aaSIlan Elias cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE; 2846a2968aaSIlan Elias 2856a2968aaSIlan Elias nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD, 286eb9bc6e9SSamuel Ortiz sizeof(struct nci_rf_deactivate_cmd), &cmd); 2876a2968aaSIlan Elias } 2886a2968aaSIlan Elias 2896a2968aaSIlan Elias static int nci_open_device(struct nci_dev *ndev) 2906a2968aaSIlan Elias { 2916a2968aaSIlan Elias int rc = 0; 2926a2968aaSIlan Elias 2936a2968aaSIlan Elias mutex_lock(&ndev->req_lock); 2946a2968aaSIlan Elias 2956a2968aaSIlan Elias if (test_bit(NCI_UP, &ndev->flags)) { 2966a2968aaSIlan Elias rc = -EALREADY; 2976a2968aaSIlan Elias goto done; 2986a2968aaSIlan Elias } 2996a2968aaSIlan Elias 3006a2968aaSIlan Elias if (ndev->ops->open(ndev)) { 3016a2968aaSIlan Elias rc = -EIO; 3026a2968aaSIlan Elias goto done; 3036a2968aaSIlan Elias } 3046a2968aaSIlan Elias 3056a2968aaSIlan Elias atomic_set(&ndev->cmd_cnt, 1); 3066a2968aaSIlan Elias 3076a2968aaSIlan Elias set_bit(NCI_INIT, &ndev->flags); 3086a2968aaSIlan Elias 3096a2968aaSIlan Elias rc = __nci_request(ndev, nci_reset_req, 0, 3106a2968aaSIlan Elias msecs_to_jiffies(NCI_RESET_TIMEOUT)); 3116a2968aaSIlan Elias 31244a589caSAmitkumar Karwar if (ndev->ops->setup) 31386e8586eSAmitkumar Karwar ndev->ops->setup(ndev); 31486e8586eSAmitkumar Karwar 3156a2968aaSIlan Elias if (!rc) { 3166a2968aaSIlan Elias rc = __nci_request(ndev, nci_init_req, 0, 3176a2968aaSIlan Elias msecs_to_jiffies(NCI_INIT_TIMEOUT)); 3186a2968aaSIlan Elias } 3196a2968aaSIlan Elias 3206a2968aaSIlan Elias if (!rc) { 3216a2968aaSIlan Elias rc = __nci_request(ndev, nci_init_complete_req, 0, 3226a2968aaSIlan Elias msecs_to_jiffies(NCI_INIT_TIMEOUT)); 3236a2968aaSIlan Elias } 3246a2968aaSIlan Elias 3256a2968aaSIlan Elias clear_bit(NCI_INIT, &ndev->flags); 3266a2968aaSIlan Elias 3276a2968aaSIlan Elias if (!rc) { 3286a2968aaSIlan Elias set_bit(NCI_UP, &ndev->flags); 329019c4fbaSIlan Elias nci_clear_target_list(ndev); 3308939e47fSIlan Elias atomic_set(&ndev->state, NCI_IDLE); 3316a2968aaSIlan Elias } else { 3326a2968aaSIlan Elias /* Init failed, cleanup */ 3336a2968aaSIlan Elias skb_queue_purge(&ndev->cmd_q); 3346a2968aaSIlan Elias skb_queue_purge(&ndev->rx_q); 3356a2968aaSIlan Elias skb_queue_purge(&ndev->tx_q); 3366a2968aaSIlan Elias 3376a2968aaSIlan Elias ndev->ops->close(ndev); 3386a2968aaSIlan Elias ndev->flags = 0; 3396a2968aaSIlan Elias } 3406a2968aaSIlan Elias 3416a2968aaSIlan Elias done: 3426a2968aaSIlan Elias mutex_unlock(&ndev->req_lock); 3436a2968aaSIlan Elias return rc; 3446a2968aaSIlan Elias } 3456a2968aaSIlan Elias 3466a2968aaSIlan Elias static int nci_close_device(struct nci_dev *ndev) 3476a2968aaSIlan Elias { 3486a2968aaSIlan Elias nci_req_cancel(ndev, ENODEV); 3496a2968aaSIlan Elias mutex_lock(&ndev->req_lock); 3506a2968aaSIlan Elias 3516a2968aaSIlan Elias if (!test_and_clear_bit(NCI_UP, &ndev->flags)) { 3526a2968aaSIlan Elias del_timer_sync(&ndev->cmd_timer); 353c4bf98b2SIlan Elias del_timer_sync(&ndev->data_timer); 3546a2968aaSIlan Elias mutex_unlock(&ndev->req_lock); 3556a2968aaSIlan Elias return 0; 3566a2968aaSIlan Elias } 3576a2968aaSIlan Elias 3586a2968aaSIlan Elias /* Drop RX and TX queues */ 3596a2968aaSIlan Elias skb_queue_purge(&ndev->rx_q); 3606a2968aaSIlan Elias skb_queue_purge(&ndev->tx_q); 3616a2968aaSIlan Elias 3626a2968aaSIlan Elias /* Flush RX and TX wq */ 3636a2968aaSIlan Elias flush_workqueue(ndev->rx_wq); 3646a2968aaSIlan Elias flush_workqueue(ndev->tx_wq); 3656a2968aaSIlan Elias 3666a2968aaSIlan Elias /* Reset device */ 3676a2968aaSIlan Elias skb_queue_purge(&ndev->cmd_q); 3686a2968aaSIlan Elias atomic_set(&ndev->cmd_cnt, 1); 3696a2968aaSIlan Elias 3706a2968aaSIlan Elias set_bit(NCI_INIT, &ndev->flags); 3716a2968aaSIlan Elias __nci_request(ndev, nci_reset_req, 0, 3726a2968aaSIlan Elias msecs_to_jiffies(NCI_RESET_TIMEOUT)); 3736a2968aaSIlan Elias clear_bit(NCI_INIT, &ndev->flags); 3746a2968aaSIlan Elias 375fa9be5f0SAmitkumar Karwar del_timer_sync(&ndev->cmd_timer); 376fa9be5f0SAmitkumar Karwar 3776a2968aaSIlan Elias /* Flush cmd wq */ 3786a2968aaSIlan Elias flush_workqueue(ndev->cmd_wq); 3796a2968aaSIlan Elias 3806a2968aaSIlan Elias /* After this point our queues are empty 3816a2968aaSIlan Elias * and no works are scheduled. */ 3826a2968aaSIlan Elias ndev->ops->close(ndev); 3836a2968aaSIlan Elias 3846a2968aaSIlan Elias /* Clear flags */ 3856a2968aaSIlan Elias ndev->flags = 0; 3866a2968aaSIlan Elias 3876a2968aaSIlan Elias mutex_unlock(&ndev->req_lock); 3886a2968aaSIlan Elias 3896a2968aaSIlan Elias return 0; 3906a2968aaSIlan Elias } 3916a2968aaSIlan Elias 3926a2968aaSIlan Elias /* NCI command timer function */ 3936a2968aaSIlan Elias static void nci_cmd_timer(unsigned long arg) 3946a2968aaSIlan Elias { 3956a2968aaSIlan Elias struct nci_dev *ndev = (void *) arg; 3966a2968aaSIlan Elias 3976a2968aaSIlan Elias atomic_set(&ndev->cmd_cnt, 1); 3986a2968aaSIlan Elias queue_work(ndev->cmd_wq, &ndev->cmd_work); 3996a2968aaSIlan Elias } 4006a2968aaSIlan Elias 401c4bf98b2SIlan Elias /* NCI data exchange timer function */ 402c4bf98b2SIlan Elias static void nci_data_timer(unsigned long arg) 403c4bf98b2SIlan Elias { 404c4bf98b2SIlan Elias struct nci_dev *ndev = (void *) arg; 405c4bf98b2SIlan Elias 406c4bf98b2SIlan Elias set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 407c4bf98b2SIlan Elias queue_work(ndev->rx_wq, &ndev->rx_work); 408c4bf98b2SIlan Elias } 409c4bf98b2SIlan Elias 4106a2968aaSIlan Elias static int nci_dev_up(struct nfc_dev *nfc_dev) 4116a2968aaSIlan Elias { 4126a2968aaSIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 4136a2968aaSIlan Elias 4146a2968aaSIlan Elias return nci_open_device(ndev); 4156a2968aaSIlan Elias } 4166a2968aaSIlan Elias 4176a2968aaSIlan Elias static int nci_dev_down(struct nfc_dev *nfc_dev) 4186a2968aaSIlan Elias { 4196a2968aaSIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 4206a2968aaSIlan Elias 4216a2968aaSIlan Elias return nci_close_device(ndev); 4226a2968aaSIlan Elias } 4236a2968aaSIlan Elias 42422c15bf3SAmitkumar Karwar int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, __u8 *val) 42522c15bf3SAmitkumar Karwar { 42622c15bf3SAmitkumar Karwar struct nci_set_config_param param; 42722c15bf3SAmitkumar Karwar 42822c15bf3SAmitkumar Karwar if (!val || !len) 42922c15bf3SAmitkumar Karwar return 0; 43022c15bf3SAmitkumar Karwar 43122c15bf3SAmitkumar Karwar param.id = id; 43222c15bf3SAmitkumar Karwar param.len = len; 43322c15bf3SAmitkumar Karwar param.val = val; 43422c15bf3SAmitkumar Karwar 43522c15bf3SAmitkumar Karwar return __nci_request(ndev, nci_set_config_req, (unsigned long)¶m, 43622c15bf3SAmitkumar Karwar msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 43722c15bf3SAmitkumar Karwar } 43822c15bf3SAmitkumar Karwar EXPORT_SYMBOL(nci_set_config); 43922c15bf3SAmitkumar Karwar 4407e035230SIlan Elias static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev) 4417e035230SIlan Elias { 4427e035230SIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 4437e035230SIlan Elias struct nci_set_config_param param; 4447e035230SIlan Elias 4457e035230SIlan Elias param.val = nfc_get_local_general_bytes(nfc_dev, ¶m.len); 4467e035230SIlan Elias if ((param.val == NULL) || (param.len == 0)) 447f9fc36f4SSzymon Janc return 0; 4487e035230SIlan Elias 449460d8f97SSzymon Janc if (param.len > NFC_MAX_GT_LEN) 4507e035230SIlan Elias return -EINVAL; 4517e035230SIlan Elias 4527e035230SIlan Elias param.id = NCI_PN_ATR_REQ_GEN_BYTES; 4537e035230SIlan Elias 454f9fc36f4SSzymon Janc return nci_request(ndev, nci_set_config_req, (unsigned long)¶m, 4557e035230SIlan Elias msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 4567e035230SIlan Elias } 4577e035230SIlan Elias 458fe7c5800SSamuel Ortiz static int nci_start_poll(struct nfc_dev *nfc_dev, 459fe7c5800SSamuel Ortiz __u32 im_protocols, __u32 tm_protocols) 4606a2968aaSIlan Elias { 4616a2968aaSIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 4626a2968aaSIlan Elias int rc; 4636a2968aaSIlan Elias 464019c4fbaSIlan Elias if ((atomic_read(&ndev->state) == NCI_DISCOVERY) || 465019c4fbaSIlan Elias (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) { 466ed1e0ad8SJoe Perches pr_err("unable to start poll, since poll is already active\n"); 4676a2968aaSIlan Elias return -EBUSY; 4686a2968aaSIlan Elias } 4696a2968aaSIlan Elias 470de054799SIlan Elias if (ndev->target_active_prot) { 471ed1e0ad8SJoe Perches pr_err("there is an active target\n"); 472de054799SIlan Elias return -EBUSY; 473de054799SIlan Elias } 474de054799SIlan Elias 475019c4fbaSIlan Elias if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) || 476019c4fbaSIlan Elias (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) { 477019c4fbaSIlan Elias pr_debug("target active or w4 select, implicitly deactivate\n"); 4786a2968aaSIlan Elias 4796a2968aaSIlan Elias rc = nci_request(ndev, nci_rf_deactivate_req, 0, 4806a2968aaSIlan Elias msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 4816a2968aaSIlan Elias if (rc) 4826a2968aaSIlan Elias return -EBUSY; 4836a2968aaSIlan Elias } 4846a2968aaSIlan Elias 4857e035230SIlan Elias if (im_protocols & NFC_PROTO_NFC_DEP_MASK) { 4867e035230SIlan Elias rc = nci_set_local_general_bytes(nfc_dev); 4877e035230SIlan Elias if (rc) { 4887e035230SIlan Elias pr_err("failed to set local general bytes\n"); 4897e035230SIlan Elias return rc; 4907e035230SIlan Elias } 4917e035230SIlan Elias } 4927e035230SIlan Elias 493fe7c5800SSamuel Ortiz rc = nci_request(ndev, nci_rf_discover_req, im_protocols, 4946a2968aaSIlan Elias msecs_to_jiffies(NCI_RF_DISC_TIMEOUT)); 4956a2968aaSIlan Elias 4966a2968aaSIlan Elias if (!rc) 497fe7c5800SSamuel Ortiz ndev->poll_prots = im_protocols; 4986a2968aaSIlan Elias 4996a2968aaSIlan Elias return rc; 5006a2968aaSIlan Elias } 5016a2968aaSIlan Elias 5026a2968aaSIlan Elias static void nci_stop_poll(struct nfc_dev *nfc_dev) 5036a2968aaSIlan Elias { 5046a2968aaSIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 5056a2968aaSIlan Elias 506019c4fbaSIlan Elias if ((atomic_read(&ndev->state) != NCI_DISCOVERY) && 507019c4fbaSIlan Elias (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) { 508ed1e0ad8SJoe Perches pr_err("unable to stop poll, since poll is not active\n"); 5096a2968aaSIlan Elias return; 5106a2968aaSIlan Elias } 5116a2968aaSIlan Elias 5126a2968aaSIlan Elias nci_request(ndev, nci_rf_deactivate_req, 0, 5136a2968aaSIlan Elias msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 5146a2968aaSIlan Elias } 5156a2968aaSIlan Elias 51690099433SEric Lapuyade static int nci_activate_target(struct nfc_dev *nfc_dev, 51790099433SEric Lapuyade struct nfc_target *target, __u32 protocol) 5186a2968aaSIlan Elias { 5196a2968aaSIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 520019c4fbaSIlan Elias struct nci_rf_discover_select_param param; 52190099433SEric Lapuyade struct nfc_target *nci_target = NULL; 522019c4fbaSIlan Elias int i; 523019c4fbaSIlan Elias int rc = 0; 5246a2968aaSIlan Elias 52590099433SEric Lapuyade pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol); 5266a2968aaSIlan Elias 527019c4fbaSIlan Elias if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) && 528019c4fbaSIlan Elias (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) { 529ed1e0ad8SJoe Perches pr_err("there is no available target to activate\n"); 5306a2968aaSIlan Elias return -EINVAL; 5316a2968aaSIlan Elias } 5326a2968aaSIlan Elias 5336a2968aaSIlan Elias if (ndev->target_active_prot) { 534ed1e0ad8SJoe Perches pr_err("there is already an active target\n"); 5356a2968aaSIlan Elias return -EBUSY; 5366a2968aaSIlan Elias } 5376a2968aaSIlan Elias 538019c4fbaSIlan Elias for (i = 0; i < ndev->n_targets; i++) { 53990099433SEric Lapuyade if (ndev->targets[i].idx == target->idx) { 54090099433SEric Lapuyade nci_target = &ndev->targets[i]; 541019c4fbaSIlan Elias break; 542019c4fbaSIlan Elias } 543019c4fbaSIlan Elias } 544019c4fbaSIlan Elias 54590099433SEric Lapuyade if (!nci_target) { 546019c4fbaSIlan Elias pr_err("unable to find the selected target\n"); 547019c4fbaSIlan Elias return -EINVAL; 548019c4fbaSIlan Elias } 549019c4fbaSIlan Elias 55090099433SEric Lapuyade if (!(nci_target->supported_protocols & (1 << protocol))) { 551ed1e0ad8SJoe Perches pr_err("target does not support the requested protocol 0x%x\n", 5526a2968aaSIlan Elias protocol); 5536a2968aaSIlan Elias return -EINVAL; 5546a2968aaSIlan Elias } 5556a2968aaSIlan Elias 556019c4fbaSIlan Elias if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) { 55790099433SEric Lapuyade param.rf_discovery_id = nci_target->logical_idx; 5586a2968aaSIlan Elias 559019c4fbaSIlan Elias if (protocol == NFC_PROTO_JEWEL) 560019c4fbaSIlan Elias param.rf_protocol = NCI_RF_PROTOCOL_T1T; 561019c4fbaSIlan Elias else if (protocol == NFC_PROTO_MIFARE) 562019c4fbaSIlan Elias param.rf_protocol = NCI_RF_PROTOCOL_T2T; 563019c4fbaSIlan Elias else if (protocol == NFC_PROTO_FELICA) 564019c4fbaSIlan Elias param.rf_protocol = NCI_RF_PROTOCOL_T3T; 56501d719a2SSamuel Ortiz else if (protocol == NFC_PROTO_ISO14443 || 56601d719a2SSamuel Ortiz protocol == NFC_PROTO_ISO14443_B) 567019c4fbaSIlan Elias param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; 568019c4fbaSIlan Elias else 569019c4fbaSIlan Elias param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; 570019c4fbaSIlan Elias 571019c4fbaSIlan Elias rc = nci_request(ndev, nci_rf_discover_select_req, 572019c4fbaSIlan Elias (unsigned long)¶m, 573019c4fbaSIlan Elias msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT)); 574019c4fbaSIlan Elias } 575019c4fbaSIlan Elias 576019c4fbaSIlan Elias if (!rc) 577019c4fbaSIlan Elias ndev->target_active_prot = protocol; 578019c4fbaSIlan Elias 579019c4fbaSIlan Elias return rc; 5806a2968aaSIlan Elias } 5816a2968aaSIlan Elias 58290099433SEric Lapuyade static void nci_deactivate_target(struct nfc_dev *nfc_dev, 58390099433SEric Lapuyade struct nfc_target *target) 5846a2968aaSIlan Elias { 5856a2968aaSIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 5866a2968aaSIlan Elias 587767f19aeSIlan Elias pr_debug("entry\n"); 5886a2968aaSIlan Elias 5896a2968aaSIlan Elias if (!ndev->target_active_prot) { 590ed1e0ad8SJoe Perches pr_err("unable to deactivate target, no active target\n"); 5916a2968aaSIlan Elias return; 5926a2968aaSIlan Elias } 5936a2968aaSIlan Elias 5946a2968aaSIlan Elias ndev->target_active_prot = 0; 5956a2968aaSIlan Elias 5968939e47fSIlan Elias if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) { 5976a2968aaSIlan Elias nci_request(ndev, nci_rf_deactivate_req, 0, 5986a2968aaSIlan Elias msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 5996a2968aaSIlan Elias } 6006a2968aaSIlan Elias } 6016a2968aaSIlan Elias 602767f19aeSIlan Elias static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target, 603767f19aeSIlan Elias __u8 comm_mode, __u8 *gb, size_t gb_len) 604767f19aeSIlan Elias { 605767f19aeSIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 606767f19aeSIlan Elias int rc; 607767f19aeSIlan Elias 608767f19aeSIlan Elias pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode); 609767f19aeSIlan Elias 610767f19aeSIlan Elias rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP); 611767f19aeSIlan Elias if (rc) 612767f19aeSIlan Elias return rc; 613767f19aeSIlan Elias 614767f19aeSIlan Elias rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb, 615767f19aeSIlan Elias ndev->remote_gb_len); 616767f19aeSIlan Elias if (!rc) 617767f19aeSIlan Elias rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE, 618767f19aeSIlan Elias NFC_RF_INITIATOR); 619767f19aeSIlan Elias 620767f19aeSIlan Elias return rc; 621767f19aeSIlan Elias } 622767f19aeSIlan Elias 623767f19aeSIlan Elias static int nci_dep_link_down(struct nfc_dev *nfc_dev) 624767f19aeSIlan Elias { 625767f19aeSIlan Elias pr_debug("entry\n"); 626767f19aeSIlan Elias 627767f19aeSIlan Elias nci_deactivate_target(nfc_dev, NULL); 628767f19aeSIlan Elias 629767f19aeSIlan Elias return 0; 630767f19aeSIlan Elias } 631767f19aeSIlan Elias 632767f19aeSIlan Elias 633be9ae4ceSSamuel Ortiz static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, 6346a2968aaSIlan Elias struct sk_buff *skb, 635eb9bc6e9SSamuel Ortiz data_exchange_cb_t cb, void *cb_context) 6366a2968aaSIlan Elias { 6376a2968aaSIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 63838f04c6bSIlan Elias int rc; 6396a2968aaSIlan Elias 64090099433SEric Lapuyade pr_debug("target_idx %d, len %d\n", target->idx, skb->len); 6416a2968aaSIlan Elias 6426a2968aaSIlan Elias if (!ndev->target_active_prot) { 643ed1e0ad8SJoe Perches pr_err("unable to exchange data, no active target\n"); 6446a2968aaSIlan Elias return -EINVAL; 6456a2968aaSIlan Elias } 6466a2968aaSIlan Elias 64738f04c6bSIlan Elias if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 64838f04c6bSIlan Elias return -EBUSY; 64938f04c6bSIlan Elias 6506a2968aaSIlan Elias /* store cb and context to be used on receiving data */ 6516a2968aaSIlan Elias ndev->data_exchange_cb = cb; 6526a2968aaSIlan Elias ndev->data_exchange_cb_context = cb_context; 6536a2968aaSIlan Elias 654e8c0dacdSIlan Elias rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); 65538f04c6bSIlan Elias if (rc) 65638f04c6bSIlan Elias clear_bit(NCI_DATA_EXCHANGE, &ndev->flags); 65738f04c6bSIlan Elias 65838f04c6bSIlan Elias return rc; 6596a2968aaSIlan Elias } 6606a2968aaSIlan Elias 6610a946301SSamuel Ortiz static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx) 6620a946301SSamuel Ortiz { 6630a946301SSamuel Ortiz return 0; 6640a946301SSamuel Ortiz } 6650a946301SSamuel Ortiz 6660a946301SSamuel Ortiz static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx) 6670a946301SSamuel Ortiz { 6680a946301SSamuel Ortiz return 0; 6690a946301SSamuel Ortiz } 6700a946301SSamuel Ortiz 6710a946301SSamuel Ortiz static int nci_discover_se(struct nfc_dev *nfc_dev) 6720a946301SSamuel Ortiz { 6730a946301SSamuel Ortiz return 0; 6740a946301SSamuel Ortiz } 6750a946301SSamuel Ortiz 6766a2968aaSIlan Elias static struct nfc_ops nci_nfc_ops = { 6776a2968aaSIlan Elias .dev_up = nci_dev_up, 6786a2968aaSIlan Elias .dev_down = nci_dev_down, 6796a2968aaSIlan Elias .start_poll = nci_start_poll, 6806a2968aaSIlan Elias .stop_poll = nci_stop_poll, 681767f19aeSIlan Elias .dep_link_up = nci_dep_link_up, 682767f19aeSIlan Elias .dep_link_down = nci_dep_link_down, 6836a2968aaSIlan Elias .activate_target = nci_activate_target, 6846a2968aaSIlan Elias .deactivate_target = nci_deactivate_target, 685be9ae4ceSSamuel Ortiz .im_transceive = nci_transceive, 6860a946301SSamuel Ortiz .enable_se = nci_enable_se, 6870a946301SSamuel Ortiz .disable_se = nci_disable_se, 6880a946301SSamuel Ortiz .discover_se = nci_discover_se, 6896a2968aaSIlan Elias }; 6906a2968aaSIlan Elias 6916a2968aaSIlan Elias /* ---- Interface to NCI drivers ---- */ 6926a2968aaSIlan Elias 6936a2968aaSIlan Elias /** 6946a2968aaSIlan Elias * nci_allocate_device - allocate a new nci device 6956a2968aaSIlan Elias * 6966a2968aaSIlan Elias * @ops: device operations 6976a2968aaSIlan Elias * @supported_protocols: NFC protocols supported by the device 6986a2968aaSIlan Elias */ 6996a2968aaSIlan Elias struct nci_dev *nci_allocate_device(struct nci_ops *ops, 7006a2968aaSIlan Elias __u32 supported_protocols, 701eb9bc6e9SSamuel Ortiz int tx_headroom, int tx_tailroom) 7026a2968aaSIlan Elias { 7038ebafde0SDan Carpenter struct nci_dev *ndev; 7046a2968aaSIlan Elias 70524bf3304SJoe Perches pr_debug("supported_protocols 0x%x\n", supported_protocols); 7066a2968aaSIlan Elias 7076a2968aaSIlan Elias if (!ops->open || !ops->close || !ops->send) 7088ebafde0SDan Carpenter return NULL; 7096a2968aaSIlan Elias 7106a2968aaSIlan Elias if (!supported_protocols) 7118ebafde0SDan Carpenter return NULL; 7126a2968aaSIlan Elias 7136a2968aaSIlan Elias ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); 7146a2968aaSIlan Elias if (!ndev) 7158ebafde0SDan Carpenter return NULL; 7166a2968aaSIlan Elias 7176a2968aaSIlan Elias ndev->ops = ops; 7186a2968aaSIlan Elias ndev->tx_headroom = tx_headroom; 7196a2968aaSIlan Elias ndev->tx_tailroom = tx_tailroom; 7209bec44bfSAxel Lin init_completion(&ndev->req_completion); 7216a2968aaSIlan Elias 7226a2968aaSIlan Elias ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops, 7236a2968aaSIlan Elias supported_protocols, 7246a2968aaSIlan Elias tx_headroom + NCI_DATA_HDR_SIZE, 7256a2968aaSIlan Elias tx_tailroom); 7266a2968aaSIlan Elias if (!ndev->nfc_dev) 7276a2968aaSIlan Elias goto free_exit; 7286a2968aaSIlan Elias 7296a2968aaSIlan Elias nfc_set_drvdata(ndev->nfc_dev, ndev); 7306a2968aaSIlan Elias 7318ebafde0SDan Carpenter return ndev; 7326a2968aaSIlan Elias 7336a2968aaSIlan Elias free_exit: 7346a2968aaSIlan Elias kfree(ndev); 7358ebafde0SDan Carpenter return NULL; 7366a2968aaSIlan Elias } 7376a2968aaSIlan Elias EXPORT_SYMBOL(nci_allocate_device); 7386a2968aaSIlan Elias 7396a2968aaSIlan Elias /** 7406a2968aaSIlan Elias * nci_free_device - deallocate nci device 7416a2968aaSIlan Elias * 7426a2968aaSIlan Elias * @ndev: The nci device to deallocate 7436a2968aaSIlan Elias */ 7446a2968aaSIlan Elias void nci_free_device(struct nci_dev *ndev) 7456a2968aaSIlan Elias { 7466a2968aaSIlan Elias nfc_free_device(ndev->nfc_dev); 7476a2968aaSIlan Elias kfree(ndev); 7486a2968aaSIlan Elias } 7496a2968aaSIlan Elias EXPORT_SYMBOL(nci_free_device); 7506a2968aaSIlan Elias 7516a2968aaSIlan Elias /** 7526a2968aaSIlan Elias * nci_register_device - register a nci device in the nfc subsystem 7536a2968aaSIlan Elias * 7546a2968aaSIlan Elias * @dev: The nci device to register 7556a2968aaSIlan Elias */ 7566a2968aaSIlan Elias int nci_register_device(struct nci_dev *ndev) 7576a2968aaSIlan Elias { 7586a2968aaSIlan Elias int rc; 7596a2968aaSIlan Elias struct device *dev = &ndev->nfc_dev->dev; 7606a2968aaSIlan Elias char name[32]; 7616a2968aaSIlan Elias 7626a2968aaSIlan Elias rc = nfc_register_device(ndev->nfc_dev); 7636a2968aaSIlan Elias if (rc) 7646a2968aaSIlan Elias goto exit; 7656a2968aaSIlan Elias 7666a2968aaSIlan Elias ndev->flags = 0; 7676a2968aaSIlan Elias 7686a2968aaSIlan Elias INIT_WORK(&ndev->cmd_work, nci_cmd_work); 7696a2968aaSIlan Elias snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev)); 7706a2968aaSIlan Elias ndev->cmd_wq = create_singlethread_workqueue(name); 7716a2968aaSIlan Elias if (!ndev->cmd_wq) { 7726a2968aaSIlan Elias rc = -ENOMEM; 7736a2968aaSIlan Elias goto unreg_exit; 7746a2968aaSIlan Elias } 7756a2968aaSIlan Elias 7766a2968aaSIlan Elias INIT_WORK(&ndev->rx_work, nci_rx_work); 7776a2968aaSIlan Elias snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev)); 7786a2968aaSIlan Elias ndev->rx_wq = create_singlethread_workqueue(name); 7796a2968aaSIlan Elias if (!ndev->rx_wq) { 7806a2968aaSIlan Elias rc = -ENOMEM; 7816a2968aaSIlan Elias goto destroy_cmd_wq_exit; 7826a2968aaSIlan Elias } 7836a2968aaSIlan Elias 7846a2968aaSIlan Elias INIT_WORK(&ndev->tx_work, nci_tx_work); 7856a2968aaSIlan Elias snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev)); 7866a2968aaSIlan Elias ndev->tx_wq = create_singlethread_workqueue(name); 7876a2968aaSIlan Elias if (!ndev->tx_wq) { 7886a2968aaSIlan Elias rc = -ENOMEM; 7896a2968aaSIlan Elias goto destroy_rx_wq_exit; 7906a2968aaSIlan Elias } 7916a2968aaSIlan Elias 7926a2968aaSIlan Elias skb_queue_head_init(&ndev->cmd_q); 7936a2968aaSIlan Elias skb_queue_head_init(&ndev->rx_q); 7946a2968aaSIlan Elias skb_queue_head_init(&ndev->tx_q); 7956a2968aaSIlan Elias 7966a2968aaSIlan Elias setup_timer(&ndev->cmd_timer, nci_cmd_timer, 7976a2968aaSIlan Elias (unsigned long) ndev); 798c4bf98b2SIlan Elias setup_timer(&ndev->data_timer, nci_data_timer, 799c4bf98b2SIlan Elias (unsigned long) ndev); 8006a2968aaSIlan Elias 8016a2968aaSIlan Elias mutex_init(&ndev->req_lock); 8026a2968aaSIlan Elias 8036a2968aaSIlan Elias goto exit; 8046a2968aaSIlan Elias 8056a2968aaSIlan Elias destroy_rx_wq_exit: 8066a2968aaSIlan Elias destroy_workqueue(ndev->rx_wq); 8076a2968aaSIlan Elias 8086a2968aaSIlan Elias destroy_cmd_wq_exit: 8096a2968aaSIlan Elias destroy_workqueue(ndev->cmd_wq); 8106a2968aaSIlan Elias 8116a2968aaSIlan Elias unreg_exit: 8126a2968aaSIlan Elias nfc_unregister_device(ndev->nfc_dev); 8136a2968aaSIlan Elias 8146a2968aaSIlan Elias exit: 8156a2968aaSIlan Elias return rc; 8166a2968aaSIlan Elias } 8176a2968aaSIlan Elias EXPORT_SYMBOL(nci_register_device); 8186a2968aaSIlan Elias 8196a2968aaSIlan Elias /** 8206a2968aaSIlan Elias * nci_unregister_device - unregister a nci device in the nfc subsystem 8216a2968aaSIlan Elias * 8226a2968aaSIlan Elias * @dev: The nci device to unregister 8236a2968aaSIlan Elias */ 8246a2968aaSIlan Elias void nci_unregister_device(struct nci_dev *ndev) 8256a2968aaSIlan Elias { 8266a2968aaSIlan Elias nci_close_device(ndev); 8276a2968aaSIlan Elias 8286a2968aaSIlan Elias destroy_workqueue(ndev->cmd_wq); 8296a2968aaSIlan Elias destroy_workqueue(ndev->rx_wq); 8306a2968aaSIlan Elias destroy_workqueue(ndev->tx_wq); 8316a2968aaSIlan Elias 8326a2968aaSIlan Elias nfc_unregister_device(ndev->nfc_dev); 8336a2968aaSIlan Elias } 8346a2968aaSIlan Elias EXPORT_SYMBOL(nci_unregister_device); 8356a2968aaSIlan Elias 8366a2968aaSIlan Elias /** 8376a2968aaSIlan Elias * nci_recv_frame - receive frame from NCI drivers 8386a2968aaSIlan Elias * 8391095e69fSFrederic Danis * @ndev: The nci device 8406a2968aaSIlan Elias * @skb: The sk_buff to receive 8416a2968aaSIlan Elias */ 8421095e69fSFrederic Danis int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb) 8436a2968aaSIlan Elias { 84424bf3304SJoe Perches pr_debug("len %d\n", skb->len); 8456a2968aaSIlan Elias 846874934f4SSzymon Janc if (!ndev || (!test_bit(NCI_UP, &ndev->flags) && 847874934f4SSzymon Janc !test_bit(NCI_INIT, &ndev->flags))) { 8486a2968aaSIlan Elias kfree_skb(skb); 8496a2968aaSIlan Elias return -ENXIO; 8506a2968aaSIlan Elias } 8516a2968aaSIlan Elias 8526a2968aaSIlan Elias /* Queue frame for rx worker thread */ 8536a2968aaSIlan Elias skb_queue_tail(&ndev->rx_q, skb); 8546a2968aaSIlan Elias queue_work(ndev->rx_wq, &ndev->rx_work); 8556a2968aaSIlan Elias 8566a2968aaSIlan Elias return 0; 8576a2968aaSIlan Elias } 8586a2968aaSIlan Elias EXPORT_SYMBOL(nci_recv_frame); 8596a2968aaSIlan Elias 8601095e69fSFrederic Danis static int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb) 8616a2968aaSIlan Elias { 86224bf3304SJoe Perches pr_debug("len %d\n", skb->len); 8636a2968aaSIlan Elias 8646a2968aaSIlan Elias if (!ndev) { 8656a2968aaSIlan Elias kfree_skb(skb); 8666a2968aaSIlan Elias return -ENODEV; 8676a2968aaSIlan Elias } 8686a2968aaSIlan Elias 8696a2968aaSIlan Elias /* Get rid of skb owner, prior to sending to the driver. */ 8706a2968aaSIlan Elias skb_orphan(skb); 8716a2968aaSIlan Elias 87205158296SHiren Tandel /* Send copy to sniffer */ 87305158296SHiren Tandel nfc_send_to_raw_sock(ndev->nfc_dev, skb, 87405158296SHiren Tandel RAW_PAYLOAD_NCI, NFC_DIRECTION_TX); 87505158296SHiren Tandel 8761095e69fSFrederic Danis return ndev->ops->send(ndev, skb); 8776a2968aaSIlan Elias } 8786a2968aaSIlan Elias 8796a2968aaSIlan Elias /* Send NCI command */ 8806a2968aaSIlan Elias int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload) 8816a2968aaSIlan Elias { 8826a2968aaSIlan Elias struct nci_ctrl_hdr *hdr; 8836a2968aaSIlan Elias struct sk_buff *skb; 8846a2968aaSIlan Elias 88524bf3304SJoe Perches pr_debug("opcode 0x%x, plen %d\n", opcode, plen); 8866a2968aaSIlan Elias 8876a2968aaSIlan Elias skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL); 8886a2968aaSIlan Elias if (!skb) { 889ed1e0ad8SJoe Perches pr_err("no memory for command\n"); 8906a2968aaSIlan Elias return -ENOMEM; 8916a2968aaSIlan Elias } 8926a2968aaSIlan Elias 8936a2968aaSIlan Elias hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE); 8946a2968aaSIlan Elias hdr->gid = nci_opcode_gid(opcode); 8956a2968aaSIlan Elias hdr->oid = nci_opcode_oid(opcode); 8966a2968aaSIlan Elias hdr->plen = plen; 8976a2968aaSIlan Elias 8986a2968aaSIlan Elias nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT); 8996a2968aaSIlan Elias nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST); 9006a2968aaSIlan Elias 9016a2968aaSIlan Elias if (plen) 9026a2968aaSIlan Elias memcpy(skb_put(skb, plen), payload, plen); 9036a2968aaSIlan Elias 9046a2968aaSIlan Elias skb_queue_tail(&ndev->cmd_q, skb); 9056a2968aaSIlan Elias queue_work(ndev->cmd_wq, &ndev->cmd_work); 9066a2968aaSIlan Elias 9076a2968aaSIlan Elias return 0; 9086a2968aaSIlan Elias } 9096a2968aaSIlan Elias 9106a2968aaSIlan Elias /* ---- NCI TX Data worker thread ---- */ 9116a2968aaSIlan Elias 9126a2968aaSIlan Elias static void nci_tx_work(struct work_struct *work) 9136a2968aaSIlan Elias { 9146a2968aaSIlan Elias struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work); 9156a2968aaSIlan Elias struct sk_buff *skb; 9166a2968aaSIlan Elias 91724bf3304SJoe Perches pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt)); 9186a2968aaSIlan Elias 9196a2968aaSIlan Elias /* Send queued tx data */ 9206a2968aaSIlan Elias while (atomic_read(&ndev->credits_cnt)) { 9216a2968aaSIlan Elias skb = skb_dequeue(&ndev->tx_q); 9226a2968aaSIlan Elias if (!skb) 9236a2968aaSIlan Elias return; 9246a2968aaSIlan Elias 925db98c829SIlan Elias /* Check if data flow control is used */ 926db98c829SIlan Elias if (atomic_read(&ndev->credits_cnt) != 927db98c829SIlan Elias NCI_DATA_FLOW_CONTROL_NOT_USED) 9286a2968aaSIlan Elias atomic_dec(&ndev->credits_cnt); 9296a2968aaSIlan Elias 93020c239c1SJoe Perches pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n", 9316a2968aaSIlan Elias nci_pbf(skb->data), 9326a2968aaSIlan Elias nci_conn_id(skb->data), 9336a2968aaSIlan Elias nci_plen(skb->data)); 9346a2968aaSIlan Elias 9351095e69fSFrederic Danis nci_send_frame(ndev, skb); 936c4bf98b2SIlan Elias 937c4bf98b2SIlan Elias mod_timer(&ndev->data_timer, 938c4bf98b2SIlan Elias jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT)); 9396a2968aaSIlan Elias } 9406a2968aaSIlan Elias } 9416a2968aaSIlan Elias 9426a2968aaSIlan Elias /* ----- NCI RX worker thread (data & control) ----- */ 9436a2968aaSIlan Elias 9446a2968aaSIlan Elias static void nci_rx_work(struct work_struct *work) 9456a2968aaSIlan Elias { 9466a2968aaSIlan Elias struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work); 9476a2968aaSIlan Elias struct sk_buff *skb; 9486a2968aaSIlan Elias 9496a2968aaSIlan Elias while ((skb = skb_dequeue(&ndev->rx_q))) { 95005158296SHiren Tandel 95105158296SHiren Tandel /* Send copy to sniffer */ 95205158296SHiren Tandel nfc_send_to_raw_sock(ndev->nfc_dev, skb, 95305158296SHiren Tandel RAW_PAYLOAD_NCI, NFC_DIRECTION_RX); 95405158296SHiren Tandel 9556a2968aaSIlan Elias /* Process frame */ 9566a2968aaSIlan Elias switch (nci_mt(skb->data)) { 9576a2968aaSIlan Elias case NCI_MT_RSP_PKT: 9586a2968aaSIlan Elias nci_rsp_packet(ndev, skb); 9596a2968aaSIlan Elias break; 9606a2968aaSIlan Elias 9616a2968aaSIlan Elias case NCI_MT_NTF_PKT: 9626a2968aaSIlan Elias nci_ntf_packet(ndev, skb); 9636a2968aaSIlan Elias break; 9646a2968aaSIlan Elias 9656a2968aaSIlan Elias case NCI_MT_DATA_PKT: 9666a2968aaSIlan Elias nci_rx_data_packet(ndev, skb); 9676a2968aaSIlan Elias break; 9686a2968aaSIlan Elias 9696a2968aaSIlan Elias default: 970ed1e0ad8SJoe Perches pr_err("unknown MT 0x%x\n", nci_mt(skb->data)); 9716a2968aaSIlan Elias kfree_skb(skb); 9726a2968aaSIlan Elias break; 9736a2968aaSIlan Elias } 9746a2968aaSIlan Elias } 975c4bf98b2SIlan Elias 976c4bf98b2SIlan Elias /* check if a data exchange timout has occurred */ 977c4bf98b2SIlan Elias if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) { 978c4bf98b2SIlan Elias /* complete the data exchange transaction, if exists */ 979c4bf98b2SIlan Elias if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 980c4bf98b2SIlan Elias nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT); 981c4bf98b2SIlan Elias 982c4bf98b2SIlan Elias clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 983c4bf98b2SIlan Elias } 9846a2968aaSIlan Elias } 9856a2968aaSIlan Elias 9866a2968aaSIlan Elias /* ----- NCI TX CMD worker thread ----- */ 9876a2968aaSIlan Elias 9886a2968aaSIlan Elias static void nci_cmd_work(struct work_struct *work) 9896a2968aaSIlan Elias { 9906a2968aaSIlan Elias struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work); 9916a2968aaSIlan Elias struct sk_buff *skb; 9926a2968aaSIlan Elias 99324bf3304SJoe Perches pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt)); 9946a2968aaSIlan Elias 9956a2968aaSIlan Elias /* Send queued command */ 9966a2968aaSIlan Elias if (atomic_read(&ndev->cmd_cnt)) { 9976a2968aaSIlan Elias skb = skb_dequeue(&ndev->cmd_q); 9986a2968aaSIlan Elias if (!skb) 9996a2968aaSIlan Elias return; 10006a2968aaSIlan Elias 10016a2968aaSIlan Elias atomic_dec(&ndev->cmd_cnt); 10026a2968aaSIlan Elias 100320c239c1SJoe Perches pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 10046a2968aaSIlan Elias nci_pbf(skb->data), 10056a2968aaSIlan Elias nci_opcode_gid(nci_opcode(skb->data)), 10066a2968aaSIlan Elias nci_opcode_oid(nci_opcode(skb->data)), 10076a2968aaSIlan Elias nci_plen(skb->data)); 10086a2968aaSIlan Elias 10091095e69fSFrederic Danis nci_send_frame(ndev, skb); 10106a2968aaSIlan Elias 10116a2968aaSIlan Elias mod_timer(&ndev->cmd_timer, 10126a2968aaSIlan Elias jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT)); 10136a2968aaSIlan Elias } 10146a2968aaSIlan Elias } 10158a70e7f8SDave Jones 10168a70e7f8SDave Jones MODULE_LICENSE("GPL"); 1017