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 236a2968aaSIlan Elias * along with this program; if not, write to the Free Software 246a2968aaSIlan Elias * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 256a2968aaSIlan Elias * 266a2968aaSIlan Elias */ 276a2968aaSIlan Elias 2852858b51SSamuel Ortiz #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ 29ed1e0ad8SJoe Perches 308a70e7f8SDave Jones #include <linux/module.h> 316a2968aaSIlan Elias #include <linux/types.h> 326a2968aaSIlan Elias #include <linux/workqueue.h> 336a2968aaSIlan Elias #include <linux/completion.h> 34bc3b2d7fSPaul Gortmaker #include <linux/export.h> 356a2968aaSIlan Elias #include <linux/sched.h> 366a2968aaSIlan Elias #include <linux/bitops.h> 376a2968aaSIlan Elias #include <linux/skbuff.h> 386a2968aaSIlan Elias 396a2968aaSIlan Elias #include "../nfc.h" 406a2968aaSIlan Elias #include <net/nfc/nci.h> 416a2968aaSIlan Elias #include <net/nfc/nci_core.h> 426a2968aaSIlan Elias #include <linux/nfc.h> 436a2968aaSIlan Elias 446a2968aaSIlan Elias static void nci_cmd_work(struct work_struct *work); 456a2968aaSIlan Elias static void nci_rx_work(struct work_struct *work); 466a2968aaSIlan Elias static void nci_tx_work(struct work_struct *work); 476a2968aaSIlan Elias 486a2968aaSIlan Elias /* ---- NCI requests ---- */ 496a2968aaSIlan Elias 506a2968aaSIlan Elias void nci_req_complete(struct nci_dev *ndev, int result) 516a2968aaSIlan Elias { 526a2968aaSIlan Elias if (ndev->req_status == NCI_REQ_PEND) { 536a2968aaSIlan Elias ndev->req_result = result; 546a2968aaSIlan Elias ndev->req_status = NCI_REQ_DONE; 556a2968aaSIlan Elias complete(&ndev->req_completion); 566a2968aaSIlan Elias } 576a2968aaSIlan Elias } 586a2968aaSIlan Elias 596a2968aaSIlan Elias static void nci_req_cancel(struct nci_dev *ndev, int err) 606a2968aaSIlan Elias { 616a2968aaSIlan Elias if (ndev->req_status == NCI_REQ_PEND) { 626a2968aaSIlan Elias ndev->req_result = err; 636a2968aaSIlan Elias ndev->req_status = NCI_REQ_CANCELED; 646a2968aaSIlan Elias complete(&ndev->req_completion); 656a2968aaSIlan Elias } 666a2968aaSIlan Elias } 676a2968aaSIlan Elias 686a2968aaSIlan Elias /* Execute request and wait for completion. */ 696a2968aaSIlan Elias static int __nci_request(struct nci_dev *ndev, 706a2968aaSIlan Elias void (*req)(struct nci_dev *ndev, unsigned long opt), 71eb9bc6e9SSamuel Ortiz unsigned long opt, __u32 timeout) 726a2968aaSIlan Elias { 736a2968aaSIlan Elias int rc = 0; 74f8c141c3SDan Carpenter long completion_rc; 756a2968aaSIlan Elias 766a2968aaSIlan Elias ndev->req_status = NCI_REQ_PEND; 776a2968aaSIlan Elias 786a2968aaSIlan Elias init_completion(&ndev->req_completion); 796a2968aaSIlan Elias req(ndev, opt); 80eb9bc6e9SSamuel Ortiz completion_rc = 81eb9bc6e9SSamuel Ortiz wait_for_completion_interruptible_timeout(&ndev->req_completion, 826a2968aaSIlan Elias timeout); 836a2968aaSIlan Elias 8420c239c1SJoe Perches pr_debug("wait_for_completion return %ld\n", completion_rc); 856a2968aaSIlan Elias 866a2968aaSIlan Elias if (completion_rc > 0) { 876a2968aaSIlan Elias switch (ndev->req_status) { 886a2968aaSIlan Elias case NCI_REQ_DONE: 896a2968aaSIlan Elias rc = nci_to_errno(ndev->req_result); 906a2968aaSIlan Elias break; 916a2968aaSIlan Elias 926a2968aaSIlan Elias case NCI_REQ_CANCELED: 936a2968aaSIlan Elias rc = -ndev->req_result; 946a2968aaSIlan Elias break; 956a2968aaSIlan Elias 966a2968aaSIlan Elias default: 976a2968aaSIlan Elias rc = -ETIMEDOUT; 986a2968aaSIlan Elias break; 996a2968aaSIlan Elias } 1006a2968aaSIlan Elias } else { 101ed1e0ad8SJoe Perches pr_err("wait_for_completion_interruptible_timeout failed %ld\n", 1026a2968aaSIlan Elias completion_rc); 1036a2968aaSIlan Elias 1046a2968aaSIlan Elias rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc)); 1056a2968aaSIlan Elias } 1066a2968aaSIlan Elias 1076a2968aaSIlan Elias ndev->req_status = ndev->req_result = 0; 1086a2968aaSIlan Elias 1096a2968aaSIlan Elias return rc; 1106a2968aaSIlan Elias } 1116a2968aaSIlan Elias 1126a2968aaSIlan Elias static inline int nci_request(struct nci_dev *ndev, 113eb9bc6e9SSamuel Ortiz void (*req)(struct nci_dev *ndev, 114eb9bc6e9SSamuel Ortiz unsigned long opt), 1156a2968aaSIlan Elias unsigned long opt, __u32 timeout) 1166a2968aaSIlan Elias { 1176a2968aaSIlan Elias int rc; 1186a2968aaSIlan Elias 1196a2968aaSIlan Elias if (!test_bit(NCI_UP, &ndev->flags)) 1206a2968aaSIlan Elias return -ENETDOWN; 1216a2968aaSIlan Elias 1226a2968aaSIlan Elias /* Serialize all requests */ 1236a2968aaSIlan Elias mutex_lock(&ndev->req_lock); 1246a2968aaSIlan Elias rc = __nci_request(ndev, req, opt, timeout); 1256a2968aaSIlan Elias mutex_unlock(&ndev->req_lock); 1266a2968aaSIlan Elias 1276a2968aaSIlan Elias return rc; 1286a2968aaSIlan Elias } 1296a2968aaSIlan Elias 1306a2968aaSIlan Elias static void nci_reset_req(struct nci_dev *ndev, unsigned long opt) 1316a2968aaSIlan Elias { 132e8c0dacdSIlan Elias struct nci_core_reset_cmd cmd; 133e8c0dacdSIlan Elias 134e8c0dacdSIlan Elias cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG; 135e8c0dacdSIlan Elias nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd); 1366a2968aaSIlan Elias } 1376a2968aaSIlan Elias 1386a2968aaSIlan Elias static void nci_init_req(struct nci_dev *ndev, unsigned long opt) 1396a2968aaSIlan Elias { 1406a2968aaSIlan Elias nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL); 1416a2968aaSIlan Elias } 1426a2968aaSIlan Elias 1436a2968aaSIlan Elias static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt) 1446a2968aaSIlan Elias { 1452eb1dc10SIlan Elias struct nci_rf_disc_map_cmd cmd; 1462eb1dc10SIlan Elias struct disc_map_config *cfg = cmd.mapping_configs; 1472eb1dc10SIlan Elias __u8 *num = &cmd.num_mapping_configs; 1486a2968aaSIlan Elias int i; 1496a2968aaSIlan Elias 1506a2968aaSIlan Elias /* set rf mapping configurations */ 1512eb1dc10SIlan Elias *num = 0; 1526a2968aaSIlan Elias 1536a2968aaSIlan Elias /* by default mapping is set to NCI_RF_INTERFACE_FRAME */ 1546a2968aaSIlan Elias for (i = 0; i < ndev->num_supported_rf_interfaces; i++) { 1556a2968aaSIlan Elias if (ndev->supported_rf_interfaces[i] == 1566a2968aaSIlan Elias NCI_RF_INTERFACE_ISO_DEP) { 1572eb1dc10SIlan Elias cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; 158637d85a7SIlan Elias cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | 159637d85a7SIlan Elias NCI_DISC_MAP_MODE_LISTEN; 160637d85a7SIlan Elias cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP; 1612eb1dc10SIlan Elias (*num)++; 1626a2968aaSIlan Elias } else if (ndev->supported_rf_interfaces[i] == 1636a2968aaSIlan Elias NCI_RF_INTERFACE_NFC_DEP) { 1642eb1dc10SIlan Elias cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; 165637d85a7SIlan Elias cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | 166637d85a7SIlan Elias NCI_DISC_MAP_MODE_LISTEN; 167637d85a7SIlan Elias cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP; 1682eb1dc10SIlan Elias (*num)++; 1696a2968aaSIlan Elias } 1706a2968aaSIlan Elias 1712eb1dc10SIlan Elias if (*num == NCI_MAX_NUM_MAPPING_CONFIGS) 1726a2968aaSIlan Elias break; 1736a2968aaSIlan Elias } 1746a2968aaSIlan Elias 1756a2968aaSIlan Elias nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD, 176eb9bc6e9SSamuel Ortiz (1 + ((*num) * sizeof(struct disc_map_config))), &cmd); 1776a2968aaSIlan Elias } 1786a2968aaSIlan Elias 1797e035230SIlan Elias struct nci_set_config_param { 1807e035230SIlan Elias __u8 id; 1817e035230SIlan Elias size_t len; 1827e035230SIlan Elias __u8 *val; 1837e035230SIlan Elias }; 1847e035230SIlan Elias 1857e035230SIlan Elias static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt) 1867e035230SIlan Elias { 1877e035230SIlan Elias struct nci_set_config_param *param = (struct nci_set_config_param *)opt; 1887e035230SIlan Elias struct nci_core_set_config_cmd cmd; 1897e035230SIlan Elias 1907e035230SIlan Elias BUG_ON(param->len > NCI_MAX_PARAM_LEN); 1917e035230SIlan Elias 1927e035230SIlan Elias cmd.num_params = 1; 1937e035230SIlan Elias cmd.param.id = param->id; 1947e035230SIlan Elias cmd.param.len = param->len; 1957e035230SIlan Elias memcpy(cmd.param.val, param->val, param->len); 1967e035230SIlan Elias 1977e035230SIlan Elias nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd); 1987e035230SIlan Elias } 1997e035230SIlan Elias 2006a2968aaSIlan Elias static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt) 2016a2968aaSIlan Elias { 2026a2968aaSIlan Elias struct nci_rf_disc_cmd cmd; 2036a2968aaSIlan Elias __u32 protocols = opt; 2046a2968aaSIlan Elias 2056a2968aaSIlan Elias cmd.num_disc_configs = 0; 2066a2968aaSIlan Elias 2076a2968aaSIlan Elias if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 208874934f4SSzymon Janc (protocols & NFC_PROTO_JEWEL_MASK || 209874934f4SSzymon Janc protocols & NFC_PROTO_MIFARE_MASK || 210874934f4SSzymon Janc protocols & NFC_PROTO_ISO14443_MASK || 211874934f4SSzymon Janc protocols & NFC_PROTO_NFC_DEP_MASK)) { 212637d85a7SIlan Elias cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 213637d85a7SIlan Elias NCI_NFC_A_PASSIVE_POLL_MODE; 2146a2968aaSIlan Elias cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 2156a2968aaSIlan Elias cmd.num_disc_configs++; 2166a2968aaSIlan Elias } 2176a2968aaSIlan Elias 2186a2968aaSIlan Elias if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 21901d719a2SSamuel Ortiz (protocols & NFC_PROTO_ISO14443_B_MASK)) { 220637d85a7SIlan Elias cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 221637d85a7SIlan Elias NCI_NFC_B_PASSIVE_POLL_MODE; 2226a2968aaSIlan Elias cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 2236a2968aaSIlan Elias cmd.num_disc_configs++; 2246a2968aaSIlan Elias } 2256a2968aaSIlan Elias 2266a2968aaSIlan Elias if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 227874934f4SSzymon Janc (protocols & NFC_PROTO_FELICA_MASK || 228874934f4SSzymon Janc protocols & NFC_PROTO_NFC_DEP_MASK)) { 229637d85a7SIlan Elias cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 230637d85a7SIlan Elias NCI_NFC_F_PASSIVE_POLL_MODE; 2316a2968aaSIlan Elias cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 2326a2968aaSIlan Elias cmd.num_disc_configs++; 2336a2968aaSIlan Elias } 2346a2968aaSIlan Elias 2356a2968aaSIlan Elias nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD, 2366a2968aaSIlan Elias (1 + (cmd.num_disc_configs * sizeof(struct disc_config))), 2376a2968aaSIlan Elias &cmd); 2386a2968aaSIlan Elias } 2396a2968aaSIlan Elias 240019c4fbaSIlan Elias struct nci_rf_discover_select_param { 241019c4fbaSIlan Elias __u8 rf_discovery_id; 242019c4fbaSIlan Elias __u8 rf_protocol; 243019c4fbaSIlan Elias }; 244019c4fbaSIlan Elias 245019c4fbaSIlan Elias static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt) 246019c4fbaSIlan Elias { 247019c4fbaSIlan Elias struct nci_rf_discover_select_param *param = 248019c4fbaSIlan Elias (struct nci_rf_discover_select_param *)opt; 249019c4fbaSIlan Elias struct nci_rf_discover_select_cmd cmd; 250019c4fbaSIlan Elias 251019c4fbaSIlan Elias cmd.rf_discovery_id = param->rf_discovery_id; 252019c4fbaSIlan Elias cmd.rf_protocol = param->rf_protocol; 253019c4fbaSIlan Elias 254019c4fbaSIlan Elias switch (cmd.rf_protocol) { 255019c4fbaSIlan Elias case NCI_RF_PROTOCOL_ISO_DEP: 256019c4fbaSIlan Elias cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP; 257019c4fbaSIlan Elias break; 258019c4fbaSIlan Elias 259019c4fbaSIlan Elias case NCI_RF_PROTOCOL_NFC_DEP: 260019c4fbaSIlan Elias cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP; 261019c4fbaSIlan Elias break; 262019c4fbaSIlan Elias 263019c4fbaSIlan Elias default: 264019c4fbaSIlan Elias cmd.rf_interface = NCI_RF_INTERFACE_FRAME; 265019c4fbaSIlan Elias break; 266019c4fbaSIlan Elias } 267019c4fbaSIlan Elias 268019c4fbaSIlan Elias nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD, 269eb9bc6e9SSamuel Ortiz sizeof(struct nci_rf_discover_select_cmd), &cmd); 270019c4fbaSIlan Elias } 271019c4fbaSIlan Elias 2726a2968aaSIlan Elias static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt) 2736a2968aaSIlan Elias { 2746a2968aaSIlan Elias struct nci_rf_deactivate_cmd cmd; 2756a2968aaSIlan Elias 2766a2968aaSIlan Elias cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE; 2776a2968aaSIlan Elias 2786a2968aaSIlan Elias nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD, 279eb9bc6e9SSamuel Ortiz sizeof(struct nci_rf_deactivate_cmd), &cmd); 2806a2968aaSIlan Elias } 2816a2968aaSIlan Elias 2826a2968aaSIlan Elias static int nci_open_device(struct nci_dev *ndev) 2836a2968aaSIlan Elias { 2846a2968aaSIlan Elias int rc = 0; 2856a2968aaSIlan Elias 2866a2968aaSIlan Elias mutex_lock(&ndev->req_lock); 2876a2968aaSIlan Elias 2886a2968aaSIlan Elias if (test_bit(NCI_UP, &ndev->flags)) { 2896a2968aaSIlan Elias rc = -EALREADY; 2906a2968aaSIlan Elias goto done; 2916a2968aaSIlan Elias } 2926a2968aaSIlan Elias 2936a2968aaSIlan Elias if (ndev->ops->open(ndev)) { 2946a2968aaSIlan Elias rc = -EIO; 2956a2968aaSIlan Elias goto done; 2966a2968aaSIlan Elias } 2976a2968aaSIlan Elias 2986a2968aaSIlan Elias atomic_set(&ndev->cmd_cnt, 1); 2996a2968aaSIlan Elias 3006a2968aaSIlan Elias set_bit(NCI_INIT, &ndev->flags); 3016a2968aaSIlan Elias 3026a2968aaSIlan Elias rc = __nci_request(ndev, nci_reset_req, 0, 3036a2968aaSIlan Elias msecs_to_jiffies(NCI_RESET_TIMEOUT)); 3046a2968aaSIlan Elias 3056a2968aaSIlan Elias if (!rc) { 3066a2968aaSIlan Elias rc = __nci_request(ndev, nci_init_req, 0, 3076a2968aaSIlan Elias msecs_to_jiffies(NCI_INIT_TIMEOUT)); 3086a2968aaSIlan Elias } 3096a2968aaSIlan Elias 3106a2968aaSIlan Elias if (!rc) { 3116a2968aaSIlan Elias rc = __nci_request(ndev, nci_init_complete_req, 0, 3126a2968aaSIlan Elias msecs_to_jiffies(NCI_INIT_TIMEOUT)); 3136a2968aaSIlan Elias } 3146a2968aaSIlan Elias 3156a2968aaSIlan Elias clear_bit(NCI_INIT, &ndev->flags); 3166a2968aaSIlan Elias 3176a2968aaSIlan Elias if (!rc) { 3186a2968aaSIlan Elias set_bit(NCI_UP, &ndev->flags); 319019c4fbaSIlan Elias nci_clear_target_list(ndev); 3208939e47fSIlan Elias atomic_set(&ndev->state, NCI_IDLE); 3216a2968aaSIlan Elias } else { 3226a2968aaSIlan Elias /* Init failed, cleanup */ 3236a2968aaSIlan Elias skb_queue_purge(&ndev->cmd_q); 3246a2968aaSIlan Elias skb_queue_purge(&ndev->rx_q); 3256a2968aaSIlan Elias skb_queue_purge(&ndev->tx_q); 3266a2968aaSIlan Elias 3276a2968aaSIlan Elias ndev->ops->close(ndev); 3286a2968aaSIlan Elias ndev->flags = 0; 3296a2968aaSIlan Elias } 3306a2968aaSIlan Elias 3316a2968aaSIlan Elias done: 3326a2968aaSIlan Elias mutex_unlock(&ndev->req_lock); 3336a2968aaSIlan Elias return rc; 3346a2968aaSIlan Elias } 3356a2968aaSIlan Elias 3366a2968aaSIlan Elias static int nci_close_device(struct nci_dev *ndev) 3376a2968aaSIlan Elias { 3386a2968aaSIlan Elias nci_req_cancel(ndev, ENODEV); 3396a2968aaSIlan Elias mutex_lock(&ndev->req_lock); 3406a2968aaSIlan Elias 3416a2968aaSIlan Elias if (!test_and_clear_bit(NCI_UP, &ndev->flags)) { 3426a2968aaSIlan Elias del_timer_sync(&ndev->cmd_timer); 343c4bf98b2SIlan Elias del_timer_sync(&ndev->data_timer); 3446a2968aaSIlan Elias mutex_unlock(&ndev->req_lock); 3456a2968aaSIlan Elias return 0; 3466a2968aaSIlan Elias } 3476a2968aaSIlan Elias 3486a2968aaSIlan Elias /* Drop RX and TX queues */ 3496a2968aaSIlan Elias skb_queue_purge(&ndev->rx_q); 3506a2968aaSIlan Elias skb_queue_purge(&ndev->tx_q); 3516a2968aaSIlan Elias 3526a2968aaSIlan Elias /* Flush RX and TX wq */ 3536a2968aaSIlan Elias flush_workqueue(ndev->rx_wq); 3546a2968aaSIlan Elias flush_workqueue(ndev->tx_wq); 3556a2968aaSIlan Elias 3566a2968aaSIlan Elias /* Reset device */ 3576a2968aaSIlan Elias skb_queue_purge(&ndev->cmd_q); 3586a2968aaSIlan Elias atomic_set(&ndev->cmd_cnt, 1); 3596a2968aaSIlan Elias 3606a2968aaSIlan Elias set_bit(NCI_INIT, &ndev->flags); 3616a2968aaSIlan Elias __nci_request(ndev, nci_reset_req, 0, 3626a2968aaSIlan Elias msecs_to_jiffies(NCI_RESET_TIMEOUT)); 3636a2968aaSIlan Elias clear_bit(NCI_INIT, &ndev->flags); 3646a2968aaSIlan Elias 3656a2968aaSIlan Elias /* Flush cmd wq */ 3666a2968aaSIlan Elias flush_workqueue(ndev->cmd_wq); 3676a2968aaSIlan Elias 3686a2968aaSIlan Elias /* After this point our queues are empty 3696a2968aaSIlan Elias * and no works are scheduled. */ 3706a2968aaSIlan Elias ndev->ops->close(ndev); 3716a2968aaSIlan Elias 3726a2968aaSIlan Elias /* Clear flags */ 3736a2968aaSIlan Elias ndev->flags = 0; 3746a2968aaSIlan Elias 3756a2968aaSIlan Elias mutex_unlock(&ndev->req_lock); 3766a2968aaSIlan Elias 3776a2968aaSIlan Elias return 0; 3786a2968aaSIlan Elias } 3796a2968aaSIlan Elias 3806a2968aaSIlan Elias /* NCI command timer function */ 3816a2968aaSIlan Elias static void nci_cmd_timer(unsigned long arg) 3826a2968aaSIlan Elias { 3836a2968aaSIlan Elias struct nci_dev *ndev = (void *) arg; 3846a2968aaSIlan Elias 3856a2968aaSIlan Elias atomic_set(&ndev->cmd_cnt, 1); 3866a2968aaSIlan Elias queue_work(ndev->cmd_wq, &ndev->cmd_work); 3876a2968aaSIlan Elias } 3886a2968aaSIlan Elias 389c4bf98b2SIlan Elias /* NCI data exchange timer function */ 390c4bf98b2SIlan Elias static void nci_data_timer(unsigned long arg) 391c4bf98b2SIlan Elias { 392c4bf98b2SIlan Elias struct nci_dev *ndev = (void *) arg; 393c4bf98b2SIlan Elias 394c4bf98b2SIlan Elias set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 395c4bf98b2SIlan Elias queue_work(ndev->rx_wq, &ndev->rx_work); 396c4bf98b2SIlan Elias } 397c4bf98b2SIlan Elias 3986a2968aaSIlan Elias static int nci_dev_up(struct nfc_dev *nfc_dev) 3996a2968aaSIlan Elias { 4006a2968aaSIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 4016a2968aaSIlan Elias 4026a2968aaSIlan Elias return nci_open_device(ndev); 4036a2968aaSIlan Elias } 4046a2968aaSIlan Elias 4056a2968aaSIlan Elias static int nci_dev_down(struct nfc_dev *nfc_dev) 4066a2968aaSIlan Elias { 4076a2968aaSIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 4086a2968aaSIlan Elias 4096a2968aaSIlan Elias return nci_close_device(ndev); 4106a2968aaSIlan Elias } 4116a2968aaSIlan Elias 4127e035230SIlan Elias static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev) 4137e035230SIlan Elias { 4147e035230SIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 4157e035230SIlan Elias struct nci_set_config_param param; 4167e035230SIlan Elias __u8 local_gb[NFC_MAX_GT_LEN]; 417f9fc36f4SSzymon Janc int i; 4187e035230SIlan Elias 4197e035230SIlan Elias param.val = nfc_get_local_general_bytes(nfc_dev, ¶m.len); 4207e035230SIlan Elias if ((param.val == NULL) || (param.len == 0)) 421f9fc36f4SSzymon Janc return 0; 4227e035230SIlan Elias 423460d8f97SSzymon Janc if (param.len > NFC_MAX_GT_LEN) 4247e035230SIlan Elias return -EINVAL; 4257e035230SIlan Elias 4267e035230SIlan Elias for (i = 0; i < param.len; i++) 4277e035230SIlan Elias local_gb[param.len-1-i] = param.val[i]; 4287e035230SIlan Elias 4297e035230SIlan Elias param.id = NCI_PN_ATR_REQ_GEN_BYTES; 4307e035230SIlan Elias param.val = local_gb; 4317e035230SIlan Elias 432f9fc36f4SSzymon Janc return nci_request(ndev, nci_set_config_req, (unsigned long)¶m, 4337e035230SIlan Elias msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 4347e035230SIlan Elias } 4357e035230SIlan Elias 436fe7c5800SSamuel Ortiz static int nci_start_poll(struct nfc_dev *nfc_dev, 437fe7c5800SSamuel Ortiz __u32 im_protocols, __u32 tm_protocols) 4386a2968aaSIlan Elias { 4396a2968aaSIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 4406a2968aaSIlan Elias int rc; 4416a2968aaSIlan Elias 442019c4fbaSIlan Elias if ((atomic_read(&ndev->state) == NCI_DISCOVERY) || 443019c4fbaSIlan Elias (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) { 444ed1e0ad8SJoe Perches pr_err("unable to start poll, since poll is already active\n"); 4456a2968aaSIlan Elias return -EBUSY; 4466a2968aaSIlan Elias } 4476a2968aaSIlan Elias 448de054799SIlan Elias if (ndev->target_active_prot) { 449ed1e0ad8SJoe Perches pr_err("there is an active target\n"); 450de054799SIlan Elias return -EBUSY; 451de054799SIlan Elias } 452de054799SIlan Elias 453019c4fbaSIlan Elias if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) || 454019c4fbaSIlan Elias (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) { 455019c4fbaSIlan Elias pr_debug("target active or w4 select, implicitly deactivate\n"); 4566a2968aaSIlan Elias 4576a2968aaSIlan Elias rc = nci_request(ndev, nci_rf_deactivate_req, 0, 4586a2968aaSIlan Elias msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 4596a2968aaSIlan Elias if (rc) 4606a2968aaSIlan Elias return -EBUSY; 4616a2968aaSIlan Elias } 4626a2968aaSIlan Elias 4637e035230SIlan Elias if (im_protocols & NFC_PROTO_NFC_DEP_MASK) { 4647e035230SIlan Elias rc = nci_set_local_general_bytes(nfc_dev); 4657e035230SIlan Elias if (rc) { 4667e035230SIlan Elias pr_err("failed to set local general bytes\n"); 4677e035230SIlan Elias return rc; 4687e035230SIlan Elias } 4697e035230SIlan Elias } 4707e035230SIlan Elias 471fe7c5800SSamuel Ortiz rc = nci_request(ndev, nci_rf_discover_req, im_protocols, 4726a2968aaSIlan Elias msecs_to_jiffies(NCI_RF_DISC_TIMEOUT)); 4736a2968aaSIlan Elias 4746a2968aaSIlan Elias if (!rc) 475fe7c5800SSamuel Ortiz ndev->poll_prots = im_protocols; 4766a2968aaSIlan Elias 4776a2968aaSIlan Elias return rc; 4786a2968aaSIlan Elias } 4796a2968aaSIlan Elias 4806a2968aaSIlan Elias static void nci_stop_poll(struct nfc_dev *nfc_dev) 4816a2968aaSIlan Elias { 4826a2968aaSIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 4836a2968aaSIlan Elias 484019c4fbaSIlan Elias if ((atomic_read(&ndev->state) != NCI_DISCOVERY) && 485019c4fbaSIlan Elias (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) { 486ed1e0ad8SJoe Perches pr_err("unable to stop poll, since poll is not active\n"); 4876a2968aaSIlan Elias return; 4886a2968aaSIlan Elias } 4896a2968aaSIlan Elias 4906a2968aaSIlan Elias nci_request(ndev, nci_rf_deactivate_req, 0, 4916a2968aaSIlan Elias msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 4926a2968aaSIlan Elias } 4936a2968aaSIlan Elias 49490099433SEric Lapuyade static int nci_activate_target(struct nfc_dev *nfc_dev, 49590099433SEric Lapuyade struct nfc_target *target, __u32 protocol) 4966a2968aaSIlan Elias { 4976a2968aaSIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 498019c4fbaSIlan Elias struct nci_rf_discover_select_param param; 49990099433SEric Lapuyade struct nfc_target *nci_target = NULL; 500019c4fbaSIlan Elias int i; 501019c4fbaSIlan Elias int rc = 0; 5026a2968aaSIlan Elias 50390099433SEric Lapuyade pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol); 5046a2968aaSIlan Elias 505019c4fbaSIlan Elias if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) && 506019c4fbaSIlan Elias (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) { 507ed1e0ad8SJoe Perches pr_err("there is no available target to activate\n"); 5086a2968aaSIlan Elias return -EINVAL; 5096a2968aaSIlan Elias } 5106a2968aaSIlan Elias 5116a2968aaSIlan Elias if (ndev->target_active_prot) { 512ed1e0ad8SJoe Perches pr_err("there is already an active target\n"); 5136a2968aaSIlan Elias return -EBUSY; 5146a2968aaSIlan Elias } 5156a2968aaSIlan Elias 516019c4fbaSIlan Elias for (i = 0; i < ndev->n_targets; i++) { 51790099433SEric Lapuyade if (ndev->targets[i].idx == target->idx) { 51890099433SEric Lapuyade nci_target = &ndev->targets[i]; 519019c4fbaSIlan Elias break; 520019c4fbaSIlan Elias } 521019c4fbaSIlan Elias } 522019c4fbaSIlan Elias 52390099433SEric Lapuyade if (!nci_target) { 524019c4fbaSIlan Elias pr_err("unable to find the selected target\n"); 525019c4fbaSIlan Elias return -EINVAL; 526019c4fbaSIlan Elias } 527019c4fbaSIlan Elias 52890099433SEric Lapuyade if (!(nci_target->supported_protocols & (1 << protocol))) { 529ed1e0ad8SJoe Perches pr_err("target does not support the requested protocol 0x%x\n", 5306a2968aaSIlan Elias protocol); 5316a2968aaSIlan Elias return -EINVAL; 5326a2968aaSIlan Elias } 5336a2968aaSIlan Elias 534019c4fbaSIlan Elias if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) { 53590099433SEric Lapuyade param.rf_discovery_id = nci_target->logical_idx; 5366a2968aaSIlan Elias 537019c4fbaSIlan Elias if (protocol == NFC_PROTO_JEWEL) 538019c4fbaSIlan Elias param.rf_protocol = NCI_RF_PROTOCOL_T1T; 539019c4fbaSIlan Elias else if (protocol == NFC_PROTO_MIFARE) 540019c4fbaSIlan Elias param.rf_protocol = NCI_RF_PROTOCOL_T2T; 541019c4fbaSIlan Elias else if (protocol == NFC_PROTO_FELICA) 542019c4fbaSIlan Elias param.rf_protocol = NCI_RF_PROTOCOL_T3T; 54301d719a2SSamuel Ortiz else if (protocol == NFC_PROTO_ISO14443 || 54401d719a2SSamuel Ortiz protocol == NFC_PROTO_ISO14443_B) 545019c4fbaSIlan Elias param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; 546019c4fbaSIlan Elias else 547019c4fbaSIlan Elias param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; 548019c4fbaSIlan Elias 549019c4fbaSIlan Elias rc = nci_request(ndev, nci_rf_discover_select_req, 550019c4fbaSIlan Elias (unsigned long)¶m, 551019c4fbaSIlan Elias msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT)); 552019c4fbaSIlan Elias } 553019c4fbaSIlan Elias 554019c4fbaSIlan Elias if (!rc) 555019c4fbaSIlan Elias ndev->target_active_prot = protocol; 556019c4fbaSIlan Elias 557019c4fbaSIlan Elias return rc; 5586a2968aaSIlan Elias } 5596a2968aaSIlan Elias 56090099433SEric Lapuyade static void nci_deactivate_target(struct nfc_dev *nfc_dev, 56190099433SEric Lapuyade struct nfc_target *target) 5626a2968aaSIlan Elias { 5636a2968aaSIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 5646a2968aaSIlan Elias 565767f19aeSIlan Elias pr_debug("entry\n"); 5666a2968aaSIlan Elias 5676a2968aaSIlan Elias if (!ndev->target_active_prot) { 568ed1e0ad8SJoe Perches pr_err("unable to deactivate target, no active target\n"); 5696a2968aaSIlan Elias return; 5706a2968aaSIlan Elias } 5716a2968aaSIlan Elias 5726a2968aaSIlan Elias ndev->target_active_prot = 0; 5736a2968aaSIlan Elias 5748939e47fSIlan Elias if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) { 5756a2968aaSIlan Elias nci_request(ndev, nci_rf_deactivate_req, 0, 5766a2968aaSIlan Elias msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 5776a2968aaSIlan Elias } 5786a2968aaSIlan Elias } 5796a2968aaSIlan Elias 580767f19aeSIlan Elias static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target, 581767f19aeSIlan Elias __u8 comm_mode, __u8 *gb, size_t gb_len) 582767f19aeSIlan Elias { 583767f19aeSIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 584767f19aeSIlan Elias int rc; 585767f19aeSIlan Elias 586767f19aeSIlan Elias pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode); 587767f19aeSIlan Elias 588767f19aeSIlan Elias rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP); 589767f19aeSIlan Elias if (rc) 590767f19aeSIlan Elias return rc; 591767f19aeSIlan Elias 592767f19aeSIlan Elias rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb, 593767f19aeSIlan Elias ndev->remote_gb_len); 594767f19aeSIlan Elias if (!rc) 595767f19aeSIlan Elias rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE, 596767f19aeSIlan Elias NFC_RF_INITIATOR); 597767f19aeSIlan Elias 598767f19aeSIlan Elias return rc; 599767f19aeSIlan Elias } 600767f19aeSIlan Elias 601767f19aeSIlan Elias static int nci_dep_link_down(struct nfc_dev *nfc_dev) 602767f19aeSIlan Elias { 603767f19aeSIlan Elias pr_debug("entry\n"); 604767f19aeSIlan Elias 605767f19aeSIlan Elias nci_deactivate_target(nfc_dev, NULL); 606767f19aeSIlan Elias 607767f19aeSIlan Elias return 0; 608767f19aeSIlan Elias } 609767f19aeSIlan Elias 610767f19aeSIlan Elias 611be9ae4ceSSamuel Ortiz static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, 6126a2968aaSIlan Elias struct sk_buff *skb, 613eb9bc6e9SSamuel Ortiz data_exchange_cb_t cb, void *cb_context) 6146a2968aaSIlan Elias { 6156a2968aaSIlan Elias struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 61638f04c6bSIlan Elias int rc; 6176a2968aaSIlan Elias 61890099433SEric Lapuyade pr_debug("target_idx %d, len %d\n", target->idx, skb->len); 6196a2968aaSIlan Elias 6206a2968aaSIlan Elias if (!ndev->target_active_prot) { 621ed1e0ad8SJoe Perches pr_err("unable to exchange data, no active target\n"); 6226a2968aaSIlan Elias return -EINVAL; 6236a2968aaSIlan Elias } 6246a2968aaSIlan Elias 62538f04c6bSIlan Elias if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 62638f04c6bSIlan Elias return -EBUSY; 62738f04c6bSIlan Elias 6286a2968aaSIlan Elias /* store cb and context to be used on receiving data */ 6296a2968aaSIlan Elias ndev->data_exchange_cb = cb; 6306a2968aaSIlan Elias ndev->data_exchange_cb_context = cb_context; 6316a2968aaSIlan Elias 632e8c0dacdSIlan Elias rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); 63338f04c6bSIlan Elias if (rc) 63438f04c6bSIlan Elias clear_bit(NCI_DATA_EXCHANGE, &ndev->flags); 63538f04c6bSIlan Elias 63638f04c6bSIlan Elias return rc; 6376a2968aaSIlan Elias } 6386a2968aaSIlan Elias 6396a2968aaSIlan Elias static struct nfc_ops nci_nfc_ops = { 6406a2968aaSIlan Elias .dev_up = nci_dev_up, 6416a2968aaSIlan Elias .dev_down = nci_dev_down, 6426a2968aaSIlan Elias .start_poll = nci_start_poll, 6436a2968aaSIlan Elias .stop_poll = nci_stop_poll, 644767f19aeSIlan Elias .dep_link_up = nci_dep_link_up, 645767f19aeSIlan Elias .dep_link_down = nci_dep_link_down, 6466a2968aaSIlan Elias .activate_target = nci_activate_target, 6476a2968aaSIlan Elias .deactivate_target = nci_deactivate_target, 648be9ae4ceSSamuel Ortiz .im_transceive = nci_transceive, 6496a2968aaSIlan Elias }; 6506a2968aaSIlan Elias 6516a2968aaSIlan Elias /* ---- Interface to NCI drivers ---- */ 6526a2968aaSIlan Elias 6536a2968aaSIlan Elias /** 6546a2968aaSIlan Elias * nci_allocate_device - allocate a new nci device 6556a2968aaSIlan Elias * 6566a2968aaSIlan Elias * @ops: device operations 6576a2968aaSIlan Elias * @supported_protocols: NFC protocols supported by the device 6586a2968aaSIlan Elias */ 6596a2968aaSIlan Elias struct nci_dev *nci_allocate_device(struct nci_ops *ops, 6606a2968aaSIlan Elias __u32 supported_protocols, 661390a1bd8SSamuel Ortiz __u32 supported_se, 662eb9bc6e9SSamuel Ortiz int tx_headroom, int tx_tailroom) 6636a2968aaSIlan Elias { 6648ebafde0SDan Carpenter struct nci_dev *ndev; 6656a2968aaSIlan Elias 66624bf3304SJoe Perches pr_debug("supported_protocols 0x%x\n", supported_protocols); 6676a2968aaSIlan Elias 6686a2968aaSIlan Elias if (!ops->open || !ops->close || !ops->send) 6698ebafde0SDan Carpenter return NULL; 6706a2968aaSIlan Elias 6716a2968aaSIlan Elias if (!supported_protocols) 6728ebafde0SDan Carpenter return NULL; 6736a2968aaSIlan Elias 6746a2968aaSIlan Elias ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); 6756a2968aaSIlan Elias if (!ndev) 6768ebafde0SDan Carpenter return NULL; 6776a2968aaSIlan Elias 6786a2968aaSIlan Elias ndev->ops = ops; 6796a2968aaSIlan Elias ndev->tx_headroom = tx_headroom; 6806a2968aaSIlan Elias ndev->tx_tailroom = tx_tailroom; 6816a2968aaSIlan Elias 6826a2968aaSIlan Elias ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops, 6836a2968aaSIlan Elias supported_protocols, 684390a1bd8SSamuel Ortiz supported_se, 6856a2968aaSIlan Elias tx_headroom + NCI_DATA_HDR_SIZE, 6866a2968aaSIlan Elias tx_tailroom); 6876a2968aaSIlan Elias if (!ndev->nfc_dev) 6886a2968aaSIlan Elias goto free_exit; 6896a2968aaSIlan Elias 6906a2968aaSIlan Elias nfc_set_drvdata(ndev->nfc_dev, ndev); 6916a2968aaSIlan Elias 6928ebafde0SDan Carpenter return ndev; 6936a2968aaSIlan Elias 6946a2968aaSIlan Elias free_exit: 6956a2968aaSIlan Elias kfree(ndev); 6968ebafde0SDan Carpenter return NULL; 6976a2968aaSIlan Elias } 6986a2968aaSIlan Elias EXPORT_SYMBOL(nci_allocate_device); 6996a2968aaSIlan Elias 7006a2968aaSIlan Elias /** 7016a2968aaSIlan Elias * nci_free_device - deallocate nci device 7026a2968aaSIlan Elias * 7036a2968aaSIlan Elias * @ndev: The nci device to deallocate 7046a2968aaSIlan Elias */ 7056a2968aaSIlan Elias void nci_free_device(struct nci_dev *ndev) 7066a2968aaSIlan Elias { 7076a2968aaSIlan Elias nfc_free_device(ndev->nfc_dev); 7086a2968aaSIlan Elias kfree(ndev); 7096a2968aaSIlan Elias } 7106a2968aaSIlan Elias EXPORT_SYMBOL(nci_free_device); 7116a2968aaSIlan Elias 7126a2968aaSIlan Elias /** 7136a2968aaSIlan Elias * nci_register_device - register a nci device in the nfc subsystem 7146a2968aaSIlan Elias * 7156a2968aaSIlan Elias * @dev: The nci device to register 7166a2968aaSIlan Elias */ 7176a2968aaSIlan Elias int nci_register_device(struct nci_dev *ndev) 7186a2968aaSIlan Elias { 7196a2968aaSIlan Elias int rc; 7206a2968aaSIlan Elias struct device *dev = &ndev->nfc_dev->dev; 7216a2968aaSIlan Elias char name[32]; 7226a2968aaSIlan Elias 7236a2968aaSIlan Elias rc = nfc_register_device(ndev->nfc_dev); 7246a2968aaSIlan Elias if (rc) 7256a2968aaSIlan Elias goto exit; 7266a2968aaSIlan Elias 7276a2968aaSIlan Elias ndev->flags = 0; 7286a2968aaSIlan Elias 7296a2968aaSIlan Elias INIT_WORK(&ndev->cmd_work, nci_cmd_work); 7306a2968aaSIlan Elias snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev)); 7316a2968aaSIlan Elias ndev->cmd_wq = create_singlethread_workqueue(name); 7326a2968aaSIlan Elias if (!ndev->cmd_wq) { 7336a2968aaSIlan Elias rc = -ENOMEM; 7346a2968aaSIlan Elias goto unreg_exit; 7356a2968aaSIlan Elias } 7366a2968aaSIlan Elias 7376a2968aaSIlan Elias INIT_WORK(&ndev->rx_work, nci_rx_work); 7386a2968aaSIlan Elias snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev)); 7396a2968aaSIlan Elias ndev->rx_wq = create_singlethread_workqueue(name); 7406a2968aaSIlan Elias if (!ndev->rx_wq) { 7416a2968aaSIlan Elias rc = -ENOMEM; 7426a2968aaSIlan Elias goto destroy_cmd_wq_exit; 7436a2968aaSIlan Elias } 7446a2968aaSIlan Elias 7456a2968aaSIlan Elias INIT_WORK(&ndev->tx_work, nci_tx_work); 7466a2968aaSIlan Elias snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev)); 7476a2968aaSIlan Elias ndev->tx_wq = create_singlethread_workqueue(name); 7486a2968aaSIlan Elias if (!ndev->tx_wq) { 7496a2968aaSIlan Elias rc = -ENOMEM; 7506a2968aaSIlan Elias goto destroy_rx_wq_exit; 7516a2968aaSIlan Elias } 7526a2968aaSIlan Elias 7536a2968aaSIlan Elias skb_queue_head_init(&ndev->cmd_q); 7546a2968aaSIlan Elias skb_queue_head_init(&ndev->rx_q); 7556a2968aaSIlan Elias skb_queue_head_init(&ndev->tx_q); 7566a2968aaSIlan Elias 7576a2968aaSIlan Elias setup_timer(&ndev->cmd_timer, nci_cmd_timer, 7586a2968aaSIlan Elias (unsigned long) ndev); 759c4bf98b2SIlan Elias setup_timer(&ndev->data_timer, nci_data_timer, 760c4bf98b2SIlan Elias (unsigned long) ndev); 7616a2968aaSIlan Elias 7626a2968aaSIlan Elias mutex_init(&ndev->req_lock); 7636a2968aaSIlan Elias 7646a2968aaSIlan Elias goto exit; 7656a2968aaSIlan Elias 7666a2968aaSIlan Elias destroy_rx_wq_exit: 7676a2968aaSIlan Elias destroy_workqueue(ndev->rx_wq); 7686a2968aaSIlan Elias 7696a2968aaSIlan Elias destroy_cmd_wq_exit: 7706a2968aaSIlan Elias destroy_workqueue(ndev->cmd_wq); 7716a2968aaSIlan Elias 7726a2968aaSIlan Elias unreg_exit: 7736a2968aaSIlan Elias nfc_unregister_device(ndev->nfc_dev); 7746a2968aaSIlan Elias 7756a2968aaSIlan Elias exit: 7766a2968aaSIlan Elias return rc; 7776a2968aaSIlan Elias } 7786a2968aaSIlan Elias EXPORT_SYMBOL(nci_register_device); 7796a2968aaSIlan Elias 7806a2968aaSIlan Elias /** 7816a2968aaSIlan Elias * nci_unregister_device - unregister a nci device in the nfc subsystem 7826a2968aaSIlan Elias * 7836a2968aaSIlan Elias * @dev: The nci device to unregister 7846a2968aaSIlan Elias */ 7856a2968aaSIlan Elias void nci_unregister_device(struct nci_dev *ndev) 7866a2968aaSIlan Elias { 7876a2968aaSIlan Elias nci_close_device(ndev); 7886a2968aaSIlan Elias 7896a2968aaSIlan Elias destroy_workqueue(ndev->cmd_wq); 7906a2968aaSIlan Elias destroy_workqueue(ndev->rx_wq); 7916a2968aaSIlan Elias destroy_workqueue(ndev->tx_wq); 7926a2968aaSIlan Elias 7936a2968aaSIlan Elias nfc_unregister_device(ndev->nfc_dev); 7946a2968aaSIlan Elias } 7956a2968aaSIlan Elias EXPORT_SYMBOL(nci_unregister_device); 7966a2968aaSIlan Elias 7976a2968aaSIlan Elias /** 7986a2968aaSIlan Elias * nci_recv_frame - receive frame from NCI drivers 7996a2968aaSIlan Elias * 8006a2968aaSIlan Elias * @skb: The sk_buff to receive 8016a2968aaSIlan Elias */ 8026a2968aaSIlan Elias int nci_recv_frame(struct sk_buff *skb) 8036a2968aaSIlan Elias { 8046a2968aaSIlan Elias struct nci_dev *ndev = (struct nci_dev *) skb->dev; 8056a2968aaSIlan Elias 80624bf3304SJoe Perches pr_debug("len %d\n", skb->len); 8076a2968aaSIlan Elias 808874934f4SSzymon Janc if (!ndev || (!test_bit(NCI_UP, &ndev->flags) && 809874934f4SSzymon Janc !test_bit(NCI_INIT, &ndev->flags))) { 8106a2968aaSIlan Elias kfree_skb(skb); 8116a2968aaSIlan Elias return -ENXIO; 8126a2968aaSIlan Elias } 8136a2968aaSIlan Elias 8146a2968aaSIlan Elias /* Queue frame for rx worker thread */ 8156a2968aaSIlan Elias skb_queue_tail(&ndev->rx_q, skb); 8166a2968aaSIlan Elias queue_work(ndev->rx_wq, &ndev->rx_work); 8176a2968aaSIlan Elias 8186a2968aaSIlan Elias return 0; 8196a2968aaSIlan Elias } 8206a2968aaSIlan Elias EXPORT_SYMBOL(nci_recv_frame); 8216a2968aaSIlan Elias 8226a2968aaSIlan Elias static int nci_send_frame(struct sk_buff *skb) 8236a2968aaSIlan Elias { 8246a2968aaSIlan Elias struct nci_dev *ndev = (struct nci_dev *) skb->dev; 8256a2968aaSIlan Elias 82624bf3304SJoe Perches pr_debug("len %d\n", skb->len); 8276a2968aaSIlan Elias 8286a2968aaSIlan Elias if (!ndev) { 8296a2968aaSIlan Elias kfree_skb(skb); 8306a2968aaSIlan Elias return -ENODEV; 8316a2968aaSIlan Elias } 8326a2968aaSIlan Elias 8336a2968aaSIlan Elias /* Get rid of skb owner, prior to sending to the driver. */ 8346a2968aaSIlan Elias skb_orphan(skb); 8356a2968aaSIlan Elias 8366a2968aaSIlan Elias return ndev->ops->send(skb); 8376a2968aaSIlan Elias } 8386a2968aaSIlan Elias 8396a2968aaSIlan Elias /* Send NCI command */ 8406a2968aaSIlan Elias int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload) 8416a2968aaSIlan Elias { 8426a2968aaSIlan Elias struct nci_ctrl_hdr *hdr; 8436a2968aaSIlan Elias struct sk_buff *skb; 8446a2968aaSIlan Elias 84524bf3304SJoe Perches pr_debug("opcode 0x%x, plen %d\n", opcode, plen); 8466a2968aaSIlan Elias 8476a2968aaSIlan Elias skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL); 8486a2968aaSIlan Elias if (!skb) { 849ed1e0ad8SJoe Perches pr_err("no memory for command\n"); 8506a2968aaSIlan Elias return -ENOMEM; 8516a2968aaSIlan Elias } 8526a2968aaSIlan Elias 8536a2968aaSIlan Elias hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE); 8546a2968aaSIlan Elias hdr->gid = nci_opcode_gid(opcode); 8556a2968aaSIlan Elias hdr->oid = nci_opcode_oid(opcode); 8566a2968aaSIlan Elias hdr->plen = plen; 8576a2968aaSIlan Elias 8586a2968aaSIlan Elias nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT); 8596a2968aaSIlan Elias nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST); 8606a2968aaSIlan Elias 8616a2968aaSIlan Elias if (plen) 8626a2968aaSIlan Elias memcpy(skb_put(skb, plen), payload, plen); 8636a2968aaSIlan Elias 8646a2968aaSIlan Elias skb->dev = (void *) ndev; 8656a2968aaSIlan Elias 8666a2968aaSIlan Elias skb_queue_tail(&ndev->cmd_q, skb); 8676a2968aaSIlan Elias queue_work(ndev->cmd_wq, &ndev->cmd_work); 8686a2968aaSIlan Elias 8696a2968aaSIlan Elias return 0; 8706a2968aaSIlan Elias } 8716a2968aaSIlan Elias 8726a2968aaSIlan Elias /* ---- NCI TX Data worker thread ---- */ 8736a2968aaSIlan Elias 8746a2968aaSIlan Elias static void nci_tx_work(struct work_struct *work) 8756a2968aaSIlan Elias { 8766a2968aaSIlan Elias struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work); 8776a2968aaSIlan Elias struct sk_buff *skb; 8786a2968aaSIlan Elias 87924bf3304SJoe Perches pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt)); 8806a2968aaSIlan Elias 8816a2968aaSIlan Elias /* Send queued tx data */ 8826a2968aaSIlan Elias while (atomic_read(&ndev->credits_cnt)) { 8836a2968aaSIlan Elias skb = skb_dequeue(&ndev->tx_q); 8846a2968aaSIlan Elias if (!skb) 8856a2968aaSIlan Elias return; 8866a2968aaSIlan Elias 887db98c829SIlan Elias /* Check if data flow control is used */ 888db98c829SIlan Elias if (atomic_read(&ndev->credits_cnt) != 889db98c829SIlan Elias NCI_DATA_FLOW_CONTROL_NOT_USED) 8906a2968aaSIlan Elias atomic_dec(&ndev->credits_cnt); 8916a2968aaSIlan Elias 89220c239c1SJoe Perches pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n", 8936a2968aaSIlan Elias nci_pbf(skb->data), 8946a2968aaSIlan Elias nci_conn_id(skb->data), 8956a2968aaSIlan Elias nci_plen(skb->data)); 8966a2968aaSIlan Elias 8976a2968aaSIlan Elias nci_send_frame(skb); 898c4bf98b2SIlan Elias 899c4bf98b2SIlan Elias mod_timer(&ndev->data_timer, 900c4bf98b2SIlan Elias jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT)); 9016a2968aaSIlan Elias } 9026a2968aaSIlan Elias } 9036a2968aaSIlan Elias 9046a2968aaSIlan Elias /* ----- NCI RX worker thread (data & control) ----- */ 9056a2968aaSIlan Elias 9066a2968aaSIlan Elias static void nci_rx_work(struct work_struct *work) 9076a2968aaSIlan Elias { 9086a2968aaSIlan Elias struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work); 9096a2968aaSIlan Elias struct sk_buff *skb; 9106a2968aaSIlan Elias 9116a2968aaSIlan Elias while ((skb = skb_dequeue(&ndev->rx_q))) { 9126a2968aaSIlan Elias /* Process frame */ 9136a2968aaSIlan Elias switch (nci_mt(skb->data)) { 9146a2968aaSIlan Elias case NCI_MT_RSP_PKT: 9156a2968aaSIlan Elias nci_rsp_packet(ndev, skb); 9166a2968aaSIlan Elias break; 9176a2968aaSIlan Elias 9186a2968aaSIlan Elias case NCI_MT_NTF_PKT: 9196a2968aaSIlan Elias nci_ntf_packet(ndev, skb); 9206a2968aaSIlan Elias break; 9216a2968aaSIlan Elias 9226a2968aaSIlan Elias case NCI_MT_DATA_PKT: 9236a2968aaSIlan Elias nci_rx_data_packet(ndev, skb); 9246a2968aaSIlan Elias break; 9256a2968aaSIlan Elias 9266a2968aaSIlan Elias default: 927ed1e0ad8SJoe Perches pr_err("unknown MT 0x%x\n", nci_mt(skb->data)); 9286a2968aaSIlan Elias kfree_skb(skb); 9296a2968aaSIlan Elias break; 9306a2968aaSIlan Elias } 9316a2968aaSIlan Elias } 932c4bf98b2SIlan Elias 933c4bf98b2SIlan Elias /* check if a data exchange timout has occurred */ 934c4bf98b2SIlan Elias if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) { 935c4bf98b2SIlan Elias /* complete the data exchange transaction, if exists */ 936c4bf98b2SIlan Elias if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 937c4bf98b2SIlan Elias nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT); 938c4bf98b2SIlan Elias 939c4bf98b2SIlan Elias clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 940c4bf98b2SIlan Elias } 9416a2968aaSIlan Elias } 9426a2968aaSIlan Elias 9436a2968aaSIlan Elias /* ----- NCI TX CMD worker thread ----- */ 9446a2968aaSIlan Elias 9456a2968aaSIlan Elias static void nci_cmd_work(struct work_struct *work) 9466a2968aaSIlan Elias { 9476a2968aaSIlan Elias struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work); 9486a2968aaSIlan Elias struct sk_buff *skb; 9496a2968aaSIlan Elias 95024bf3304SJoe Perches pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt)); 9516a2968aaSIlan Elias 9526a2968aaSIlan Elias /* Send queued command */ 9536a2968aaSIlan Elias if (atomic_read(&ndev->cmd_cnt)) { 9546a2968aaSIlan Elias skb = skb_dequeue(&ndev->cmd_q); 9556a2968aaSIlan Elias if (!skb) 9566a2968aaSIlan Elias return; 9576a2968aaSIlan Elias 9586a2968aaSIlan Elias atomic_dec(&ndev->cmd_cnt); 9596a2968aaSIlan Elias 96020c239c1SJoe Perches pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 9616a2968aaSIlan Elias nci_pbf(skb->data), 9626a2968aaSIlan Elias nci_opcode_gid(nci_opcode(skb->data)), 9636a2968aaSIlan Elias nci_opcode_oid(nci_opcode(skb->data)), 9646a2968aaSIlan Elias nci_plen(skb->data)); 9656a2968aaSIlan Elias 9666a2968aaSIlan Elias nci_send_frame(skb); 9676a2968aaSIlan Elias 9686a2968aaSIlan Elias mod_timer(&ndev->cmd_timer, 9696a2968aaSIlan Elias jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT)); 9706a2968aaSIlan Elias } 9716a2968aaSIlan Elias } 9728a70e7f8SDave Jones 9738a70e7f8SDave Jones MODULE_LICENSE("GPL"); 974