/* * Copyright (C) 2011 Instituto Nokia de Tecnologia * * Authors: * Lauro Ramos Venancio * Aloisio Almeida Jr * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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, write to the * Free Software Foundation, Inc., * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include #include #include #include #include #include #include #include #define VERSION "0.1" #define PN533_VENDOR_ID 0x4CC #define PN533_PRODUCT_ID 0x2533 #define SCM_VENDOR_ID 0x4E6 #define SCL3711_PRODUCT_ID 0x5591 static const struct usb_device_id pn533_table[] = { { USB_DEVICE(PN533_VENDOR_ID, PN533_PRODUCT_ID) }, { USB_DEVICE(SCM_VENDOR_ID, SCL3711_PRODUCT_ID) }, { } }; MODULE_DEVICE_TABLE(usb, pn533_table); /* frame definitions */ #define PN533_FRAME_TAIL_SIZE 2 #define PN533_FRAME_SIZE(f) (sizeof(struct pn533_frame) + f->datalen + \ PN533_FRAME_TAIL_SIZE) #define PN533_FRAME_ACK_SIZE (sizeof(struct pn533_frame) + 1) #define PN533_FRAME_CHECKSUM(f) (f->data[f->datalen]) #define PN533_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1]) /* start of frame */ #define PN533_SOF 0x00FF /* frame identifier: in/out/error */ #define PN533_FRAME_IDENTIFIER(f) (f->data[0]) #define PN533_DIR_OUT 0xD4 #define PN533_DIR_IN 0xD5 /* PN533 Commands */ #define PN533_FRAME_CMD(f) (f->data[1]) #define PN533_FRAME_CMD_PARAMS_PTR(f) (&f->data[2]) #define PN533_FRAME_CMD_PARAMS_LEN(f) (f->datalen - 2) #define PN533_CMD_GET_FIRMWARE_VERSION 0x02 #define PN533_CMD_RF_CONFIGURATION 0x32 #define PN533_CMD_IN_DATA_EXCHANGE 0x40 #define PN533_CMD_IN_LIST_PASSIVE_TARGET 0x4A #define PN533_CMD_IN_ATR 0x50 #define PN533_CMD_IN_RELEASE 0x52 #define PN533_CMD_IN_JUMP_FOR_DEP 0x56 #define PN533_CMD_TG_INIT_AS_TARGET 0x8c #define PN533_CMD_TG_GET_DATA 0x86 #define PN533_CMD_TG_SET_DATA 0x8e #define PN533_CMD_RESPONSE(cmd) (cmd + 1) /* PN533 Return codes */ #define PN533_CMD_RET_MASK 0x3F #define PN533_CMD_MI_MASK 0x40 #define PN533_CMD_RET_SUCCESS 0x00 /* PN533 status codes */ #define PN533_STATUS_TARGET_RELEASED 0x29 struct pn533; typedef int (*pn533_cmd_complete_t) (struct pn533 *dev, void *arg, u8 *params, int params_len); /* structs for pn533 commands */ /* PN533_CMD_GET_FIRMWARE_VERSION */ struct pn533_fw_version { u8 ic; u8 ver; u8 rev; u8 support; }; /* PN533_CMD_RF_CONFIGURATION */ #define PN533_CFGITEM_MAX_RETRIES 0x05 #define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00 #define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF struct pn533_config_max_retries { u8 mx_rty_atr; u8 mx_rty_psl; u8 mx_rty_passive_act; } __packed; /* PN533_CMD_IN_LIST_PASSIVE_TARGET */ /* felica commands opcode */ #define PN533_FELICA_OPC_SENSF_REQ 0 #define PN533_FELICA_OPC_SENSF_RES 1 /* felica SENSF_REQ parameters */ #define PN533_FELICA_SENSF_SC_ALL 0xFFFF #define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0 #define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1 #define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2 /* type B initiator_data values */ #define PN533_TYPE_B_AFI_ALL_FAMILIES 0 #define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0 #define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1 union pn533_cmd_poll_initdata { struct { u8 afi; u8 polling_method; } __packed type_b; struct { u8 opcode; __be16 sc; u8 rc; u8 tsn; } __packed felica; }; /* Poll modulations */ enum { PN533_POLL_MOD_106KBPS_A, PN533_POLL_MOD_212KBPS_FELICA, PN533_POLL_MOD_424KBPS_FELICA, PN533_POLL_MOD_106KBPS_JEWEL, PN533_POLL_MOD_847KBPS_B, __PN533_POLL_MOD_AFTER_LAST, }; #define PN533_POLL_MOD_MAX (__PN533_POLL_MOD_AFTER_LAST - 1) struct pn533_poll_modulations { struct { u8 maxtg; u8 brty; union pn533_cmd_poll_initdata initiator_data; } __packed data; u8 len; }; const struct pn533_poll_modulations poll_mod[] = { [PN533_POLL_MOD_106KBPS_A] = { .data = { .maxtg = 1, .brty = 0, }, .len = 2, }, [PN533_POLL_MOD_212KBPS_FELICA] = { .data = { .maxtg = 1, .brty = 1, .initiator_data.felica = { .opcode = PN533_FELICA_OPC_SENSF_REQ, .sc = PN533_FELICA_SENSF_SC_ALL, .rc = PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE, .tsn = 0, }, }, .len = 7, }, [PN533_POLL_MOD_424KBPS_FELICA] = { .data = { .maxtg = 1, .brty = 2, .initiator_data.felica = { .opcode = PN533_FELICA_OPC_SENSF_REQ, .sc = PN533_FELICA_SENSF_SC_ALL, .rc = PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE, .tsn = 0, }, }, .len = 7, }, [PN533_POLL_MOD_106KBPS_JEWEL] = { .data = { .maxtg = 1, .brty = 4, }, .len = 2, }, [PN533_POLL_MOD_847KBPS_B] = { .data = { .maxtg = 1, .brty = 8, .initiator_data.type_b = { .afi = PN533_TYPE_B_AFI_ALL_FAMILIES, .polling_method = PN533_TYPE_B_POLL_METHOD_TIMESLOT, }, }, .len = 3, }, }; /* PN533_CMD_IN_ATR */ struct pn533_cmd_activate_param { u8 tg; u8 next; } __packed; struct pn533_cmd_activate_response { u8 status; u8 nfcid3t[10]; u8 didt; u8 bst; u8 brt; u8 to; u8 ppt; /* optional */ u8 gt[]; } __packed; /* PN533_CMD_IN_JUMP_FOR_DEP */ struct pn533_cmd_jump_dep { u8 active; u8 baud; u8 next; u8 gt[]; } __packed; struct pn533_cmd_jump_dep_response { u8 status; u8 tg; u8 nfcid3t[10]; u8 didt; u8 bst; u8 brt; u8 to; u8 ppt; /* optional */ u8 gt[]; } __packed; /* PN533_TG_INIT_AS_TARGET */ #define PN533_INIT_TARGET_PASSIVE 0x1 #define PN533_INIT_TARGET_DEP 0x2 #define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3 #define PN533_INIT_TARGET_RESP_ACTIVE 0x1 #define PN533_INIT_TARGET_RESP_DEP 0x4 struct pn533_cmd_init_target { u8 mode; u8 mifare[6]; u8 felica[18]; u8 nfcid3[10]; u8 gb_len; u8 gb[]; } __packed; struct pn533_cmd_init_target_response { u8 mode; u8 cmd[]; } __packed; struct pn533 { struct usb_device *udev; struct usb_interface *interface; struct nfc_dev *nfc_dev; struct urb *out_urb; int out_maxlen; struct pn533_frame *out_frame; struct urb *in_urb; int in_maxlen; struct pn533_frame *in_frame; struct sk_buff_head resp_q; struct workqueue_struct *wq; struct work_struct cmd_work; struct work_struct mi_work; struct work_struct tg_work; struct pn533_frame *wq_in_frame; int wq_in_error; pn533_cmd_complete_t cmd_complete; void *cmd_complete_arg; struct semaphore cmd_lock; u8 cmd; struct pn533_poll_modulations *poll_mod_active[PN533_POLL_MOD_MAX + 1]; u8 poll_mod_count; u8 poll_mod_curr; u32 poll_protocols; u8 tgt_available_prots; u8 tgt_active_prot; }; struct pn533_frame { u8 preamble; __be16 start_frame; u8 datalen; u8 datalen_checksum; u8 data[]; } __packed; /* The rule: value + checksum = 0 */ static inline u8 pn533_checksum(u8 value) { return ~value + 1; } /* The rule: sum(data elements) + checksum = 0 */ static u8 pn533_data_checksum(u8 *data, int datalen) { u8 sum = 0; int i; for (i = 0; i < datalen; i++) sum += data[i]; return pn533_checksum(sum); } /** * pn533_tx_frame_ack - create a ack frame * @frame: The frame to be set as ack * * Ack is different type of standard frame. As a standard frame, it has * preamble and start_frame. However the checksum of this frame must fail, * i.e. datalen + datalen_checksum must NOT be zero. When the checksum test * fails and datalen = 0 and datalen_checksum = 0xFF, the frame is a ack. * After datalen_checksum field, the postamble is placed. */ static void pn533_tx_frame_ack(struct pn533_frame *frame) { frame->preamble = 0; frame->start_frame = cpu_to_be16(PN533_SOF); frame->datalen = 0; frame->datalen_checksum = 0xFF; /* data[0] is used as postamble */ frame->data[0] = 0; } static void pn533_tx_frame_init(struct pn533_frame *frame, u8 cmd) { frame->preamble = 0; frame->start_frame = cpu_to_be16(PN533_SOF); PN533_FRAME_IDENTIFIER(frame) = PN533_DIR_OUT; PN533_FRAME_CMD(frame) = cmd; frame->datalen = 2; } static void pn533_tx_frame_finish(struct pn533_frame *frame) { frame->datalen_checksum = pn533_checksum(frame->datalen); PN533_FRAME_CHECKSUM(frame) = pn533_data_checksum(frame->data, frame->datalen); PN533_FRAME_POSTAMBLE(frame) = 0; } static bool pn533_rx_frame_is_valid(struct pn533_frame *frame) { u8 checksum; if (frame->start_frame != cpu_to_be16(PN533_SOF)) return false; checksum = pn533_checksum(frame->datalen); if (checksum != frame->datalen_checksum) return false; checksum = pn533_data_checksum(frame->data, frame->datalen); if (checksum != PN533_FRAME_CHECKSUM(frame)) return false; return true; } static bool pn533_rx_frame_is_ack(struct pn533_frame *frame) { if (frame->start_frame != cpu_to_be16(PN533_SOF)) return false; if (frame->datalen != 0 || frame->datalen_checksum != 0xFF) return false; return true; } static bool pn533_rx_frame_is_cmd_response(struct pn533_frame *frame, u8 cmd) { return (PN533_FRAME_CMD(frame) == PN533_CMD_RESPONSE(cmd)); } static void pn533_wq_cmd_complete(struct work_struct *work) { struct pn533 *dev = container_of(work, struct pn533, cmd_work); struct pn533_frame *in_frame; int rc; in_frame = dev->wq_in_frame; if (dev->wq_in_error) rc = dev->cmd_complete(dev, dev->cmd_complete_arg, NULL, dev->wq_in_error); else rc = dev->cmd_complete(dev, dev->cmd_complete_arg, PN533_FRAME_CMD_PARAMS_PTR(in_frame), PN533_FRAME_CMD_PARAMS_LEN(in_frame)); if (rc != -EINPROGRESS) up(&dev->cmd_lock); } static void pn533_recv_response(struct urb *urb) { struct pn533 *dev = urb->context; struct pn533_frame *in_frame; dev->wq_in_frame = NULL; switch (urb->status) { case 0: /* success */ break; case -ECONNRESET: case -ENOENT: case -ESHUTDOWN: nfc_dev_dbg(&dev->interface->dev, "Urb shutting down with" " status: %d", urb->status); dev->wq_in_error = urb->status; goto sched_wq; default: nfc_dev_err(&dev->interface->dev, "Nonzero urb status received:" " %d", urb->status); dev->wq_in_error = urb->status; goto sched_wq; } in_frame = dev->in_urb->transfer_buffer; if (!pn533_rx_frame_is_valid(in_frame)) { nfc_dev_err(&dev->interface->dev, "Received an invalid frame"); dev->wq_in_error = -EIO; goto sched_wq; } if (!pn533_rx_frame_is_cmd_response(in_frame, dev->cmd)) { nfc_dev_err(&dev->interface->dev, "The received frame is not " "response to the last command"); dev->wq_in_error = -EIO; goto sched_wq; } nfc_dev_dbg(&dev->interface->dev, "Received a valid frame"); dev->wq_in_error = 0; dev->wq_in_frame = in_frame; sched_wq: queue_work(dev->wq, &dev->cmd_work); } static int pn533_submit_urb_for_response(struct pn533 *dev, gfp_t flags) { dev->in_urb->complete = pn533_recv_response; return usb_submit_urb(dev->in_urb, flags); } static void pn533_recv_ack(struct urb *urb) { struct pn533 *dev = urb->context; struct pn533_frame *in_frame; int rc; switch (urb->status) { case 0: /* success */ break; case -ECONNRESET: case -ENOENT: case -ESHUTDOWN: nfc_dev_dbg(&dev->interface->dev, "Urb shutting down with" " status: %d", urb->status); dev->wq_in_error = urb->status; goto sched_wq; default: nfc_dev_err(&dev->interface->dev, "Nonzero urb status received:" " %d", urb->status); dev->wq_in_error = urb->status; goto sched_wq; } in_frame = dev->in_urb->transfer_buffer; if (!pn533_rx_frame_is_ack(in_frame)) { nfc_dev_err(&dev->interface->dev, "Received an invalid ack"); dev->wq_in_error = -EIO; goto sched_wq; } nfc_dev_dbg(&dev->interface->dev, "Received a valid ack"); rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC); if (rc) { nfc_dev_err(&dev->interface->dev, "usb_submit_urb failed with" " result %d", rc); dev->wq_in_error = rc; goto sched_wq; } return; sched_wq: dev->wq_in_frame = NULL; queue_work(dev->wq, &dev->cmd_work); } static int pn533_submit_urb_for_ack(struct pn533 *dev, gfp_t flags) { dev->in_urb->complete = pn533_recv_ack; return usb_submit_urb(dev->in_urb, flags); } static int pn533_send_ack(struct pn533 *dev, gfp_t flags) { int rc; nfc_dev_dbg(&dev->interface->dev, "%s", __func__); pn533_tx_frame_ack(dev->out_frame); dev->out_urb->transfer_buffer = dev->out_frame; dev->out_urb->transfer_buffer_length = PN533_FRAME_ACK_SIZE; rc = usb_submit_urb(dev->out_urb, flags); return rc; } static int __pn533_send_cmd_frame_async(struct pn533 *dev, struct pn533_frame *out_frame, struct pn533_frame *in_frame, int in_frame_len, pn533_cmd_complete_t cmd_complete, void *arg, gfp_t flags) { int rc; nfc_dev_dbg(&dev->interface->dev, "Sending command 0x%x", PN533_FRAME_CMD(out_frame)); dev->cmd = PN533_FRAME_CMD(out_frame); dev->cmd_complete = cmd_complete; dev->cmd_complete_arg = arg; dev->out_urb->transfer_buffer = out_frame; dev->out_urb->transfer_buffer_length = PN533_FRAME_SIZE(out_frame); dev->in_urb->transfer_buffer = in_frame; dev->in_urb->transfer_buffer_length = in_frame_len; rc = usb_submit_urb(dev->out_urb, flags); if (rc) return rc; rc = pn533_submit_urb_for_ack(dev, flags); if (rc) goto error; return 0; error: usb_unlink_urb(dev->out_urb); return rc; } static int pn533_send_cmd_frame_async(struct pn533 *dev, struct pn533_frame *out_frame, struct pn533_frame *in_frame, int in_frame_len, pn533_cmd_complete_t cmd_complete, void *arg, gfp_t flags) { int rc; nfc_dev_dbg(&dev->interface->dev, "%s", __func__); if (down_trylock(&dev->cmd_lock)) return -EBUSY; rc = __pn533_send_cmd_frame_async(dev, out_frame, in_frame, in_frame_len, cmd_complete, arg, flags); if (rc) goto error; return 0; error: up(&dev->cmd_lock); return rc; } struct pn533_sync_cmd_response { int rc; struct completion done; }; static int pn533_sync_cmd_complete(struct pn533 *dev, void *_arg, u8 *params, int params_len) { struct pn533_sync_cmd_response *arg = _arg; nfc_dev_dbg(&dev->interface->dev, "%s", __func__); arg->rc = 0; if (params_len < 0) /* error */ arg->rc = params_len; complete(&arg->done); return 0; } static int pn533_send_cmd_frame_sync(struct pn533 *dev, struct pn533_frame *out_frame, struct pn533_frame *in_frame, int in_frame_len) { int rc; struct pn533_sync_cmd_response arg; nfc_dev_dbg(&dev->interface->dev, "%s", __func__); init_completion(&arg.done); rc = pn533_send_cmd_frame_async(dev, out_frame, in_frame, in_frame_len, pn533_sync_cmd_complete, &arg, GFP_KERNEL); if (rc) return rc; wait_for_completion(&arg.done); return arg.rc; } static void pn533_send_complete(struct urb *urb) { struct pn533 *dev = urb->context; nfc_dev_dbg(&dev->interface->dev, "%s", __func__); switch (urb->status) { case 0: /* success */ break; case -ECONNRESET: case -ENOENT: case -ESHUTDOWN: nfc_dev_dbg(&dev->interface->dev, "Urb shutting down with" " status: %d", urb->status); break; default: nfc_dev_dbg(&dev->interface->dev, "Nonzero urb status received:" " %d", urb->status); } } struct pn533_target_type_a { __be16 sens_res; u8 sel_res; u8 nfcid_len; u8 nfcid_data[]; } __packed; #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6)) #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0)) #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8)) #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5) #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2) #define PN533_TYPE_A_SEL_PROT_MIFARE 0 #define PN533_TYPE_A_SEL_PROT_ISO14443 1 #define PN533_TYPE_A_SEL_PROT_DEP 2 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a, int target_data_len) { u8 ssd; u8 platconf; if (target_data_len < sizeof(struct pn533_target_type_a)) return false; /* The lenght check of nfcid[] and ats[] are not being performed because the values are not being used */ /* Requirement 4.6.3.3 from NFC Forum Digital Spec */ ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res); platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res); if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL && platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) || (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL && platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL)) return false; /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */ if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0) return false; return true; } static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data, int tgt_data_len) { struct pn533_target_type_a *tgt_type_a; tgt_type_a = (struct pn533_target_type_a *) tgt_data; if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len)) return -EPROTO; switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) { case PN533_TYPE_A_SEL_PROT_MIFARE: nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK; break; case PN533_TYPE_A_SEL_PROT_ISO14443: nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK; break; case PN533_TYPE_A_SEL_PROT_DEP: nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK; break; case PN533_TYPE_A_SEL_PROT_ISO14443_DEP: nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK; break; } nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res); nfc_tgt->sel_res = tgt_type_a->sel_res; nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len; memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len); return 0; } struct pn533_target_felica { u8 pol_res; u8 opcode; u8 nfcid2[8]; u8 pad[8]; /* optional */ u8 syst_code[]; } __packed; #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica, int target_data_len) { if (target_data_len < sizeof(struct pn533_target_felica)) return false; if (felica->opcode != PN533_FELICA_OPC_SENSF_RES) return false; return true; } static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data, int tgt_data_len) { struct pn533_target_felica *tgt_felica; tgt_felica = (struct pn533_target_felica *) tgt_data; if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len)) return -EPROTO; if (tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1 && tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2) nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK; else nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK; memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9); nfc_tgt->sensf_res_len = 9; return 0; } struct pn533_target_jewel { __be16 sens_res; u8 jewelid[4]; } __packed; static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel, int target_data_len) { u8 ssd; u8 platconf; if (target_data_len < sizeof(struct pn533_target_jewel)) return false; /* Requirement 4.6.3.3 from NFC Forum Digital Spec */ ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res); platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res); if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL && platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) || (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL && platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL)) return false; return true; } static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data, int tgt_data_len) { struct pn533_target_jewel *tgt_jewel; tgt_jewel = (struct pn533_target_jewel *) tgt_data; if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len)) return -EPROTO; nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK; nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res); nfc_tgt->nfcid1_len = 4; memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len); return 0; } struct pn533_type_b_prot_info { u8 bitrate; u8 fsci_type; u8 fwi_adc_fo; } __packed; #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4) #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0) #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8 struct pn533_type_b_sens_res { u8 opcode; u8 nfcid[4]; u8 appdata[4]; struct pn533_type_b_prot_info prot_info; } __packed; #define PN533_TYPE_B_OPC_SENSB_RES 0x50 struct pn533_target_type_b { struct pn533_type_b_sens_res sensb_res; u8 attrib_res_len; u8 attrib_res[]; } __packed; static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b, int target_data_len) { if (target_data_len < sizeof(struct pn533_target_type_b)) return false; if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES) return false; if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) & PN533_TYPE_B_PROT_TYPE_RFU_MASK) return false; return true; } static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data, int tgt_data_len) { struct pn533_target_type_b *tgt_type_b; tgt_type_b = (struct pn533_target_type_b *) tgt_data; if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len)) return -EPROTO; nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK; return 0; } struct pn533_poll_response { u8 nbtg; u8 tg; u8 target_data[]; } __packed; static int pn533_target_found(struct pn533 *dev, struct pn533_poll_response *resp, int resp_len) { int target_data_len; struct nfc_target nfc_tgt; int rc; nfc_dev_dbg(&dev->interface->dev, "%s - modulation=%d", __func__, dev->poll_mod_curr); if (resp->tg != 1) return -EPROTO; memset(&nfc_tgt, 0, sizeof(struct nfc_target)); target_data_len = resp_len - sizeof(struct pn533_poll_response); switch (dev->poll_mod_curr) { case PN533_POLL_MOD_106KBPS_A: rc = pn533_target_found_type_a(&nfc_tgt, resp->target_data, target_data_len); break; case PN533_POLL_MOD_212KBPS_FELICA: case PN533_POLL_MOD_424KBPS_FELICA: rc = pn533_target_found_felica(&nfc_tgt, resp->target_data, target_data_len); break; case PN533_POLL_MOD_106KBPS_JEWEL: rc = pn533_target_found_jewel(&nfc_tgt, resp->target_data, target_data_len); break; case PN533_POLL_MOD_847KBPS_B: rc = pn533_target_found_type_b(&nfc_tgt, resp->target_data, target_data_len); break; default: nfc_dev_err(&dev->interface->dev, "Unknown current poll" " modulation"); return -EPROTO; } if (rc) return rc; if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) { nfc_dev_dbg(&dev->interface->dev, "The target found does not" " have the desired protocol"); return -EAGAIN; } nfc_dev_dbg(&dev->interface->dev, "Target found - supported protocols: " "0x%x", nfc_tgt.supported_protocols); dev->tgt_available_prots = nfc_tgt.supported_protocols; nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1); return 0; } static void pn533_poll_reset_mod_list(struct pn533 *dev) { dev->poll_mod_count = 0; } static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index) { dev->poll_mod_active[dev->poll_mod_count] = (struct pn533_poll_modulations *) &poll_mod[mod_index]; dev->poll_mod_count++; } static void pn533_poll_create_mod_list(struct pn533 *dev, u32 protocols) { pn533_poll_reset_mod_list(dev); if (protocols & NFC_PROTO_MIFARE_MASK || protocols & NFC_PROTO_ISO14443_MASK || protocols & NFC_PROTO_NFC_DEP_MASK) pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A); if (protocols & NFC_PROTO_FELICA_MASK || protocols & NFC_PROTO_NFC_DEP_MASK) { pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA); pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA); } if (protocols & NFC_PROTO_JEWEL_MASK) pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL); if (protocols & NFC_PROTO_ISO14443_MASK) pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B); } static void pn533_start_poll_frame(struct pn533_frame *frame, struct pn533_poll_modulations *mod) { pn533_tx_frame_init(frame, PN533_CMD_IN_LIST_PASSIVE_TARGET); memcpy(PN533_FRAME_CMD_PARAMS_PTR(frame), &mod->data, mod->len); frame->datalen += mod->len; pn533_tx_frame_finish(frame); } static int pn533_start_poll_complete(struct pn533 *dev, void *arg, u8 *params, int params_len) { struct pn533_poll_response *resp; struct pn533_poll_modulations *next_mod; int rc; nfc_dev_dbg(&dev->interface->dev, "%s", __func__); if (params_len == -ENOENT) { nfc_dev_dbg(&dev->interface->dev, "Polling operation has been" " stopped"); goto stop_poll; } if (params_len < 0) { nfc_dev_err(&dev->interface->dev, "Error %d when running poll", params_len); goto stop_poll; } resp = (struct pn533_poll_response *) params; if (resp->nbtg) { rc = pn533_target_found(dev, resp, params_len); /* We must stop the poll after a valid target found */ if (rc == 0) goto stop_poll; if (rc != -EAGAIN) nfc_dev_err(&dev->interface->dev, "The target found is" " not valid - continuing to poll"); } dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count; next_mod = dev->poll_mod_active[dev->poll_mod_curr]; nfc_dev_dbg(&dev->interface->dev, "Polling next modulation (0x%x)", dev->poll_mod_curr); pn533_start_poll_frame(dev->out_frame, next_mod); /* Don't need to down the semaphore again */ rc = __pn533_send_cmd_frame_async(dev, dev->out_frame, dev->in_frame, dev->in_maxlen, pn533_start_poll_complete, NULL, GFP_ATOMIC); if (rc == -EPERM) { nfc_dev_dbg(&dev->interface->dev, "Cannot poll next modulation" " because poll has been stopped"); goto stop_poll; } if (rc) { nfc_dev_err(&dev->interface->dev, "Error %d when trying to poll" " next modulation", rc); goto stop_poll; } /* Inform caller function to do not up the semaphore */ return -EINPROGRESS; stop_poll: pn533_poll_reset_mod_list(dev); dev->poll_protocols = 0; return 0; } static int pn533_init_target_frame(struct pn533_frame *frame, u8 *gb, size_t gb_len) { struct pn533_cmd_init_target *cmd; size_t cmd_len; cmd_len = sizeof(struct pn533_cmd_init_target) + gb_len + 1; cmd = kzalloc(cmd_len, GFP_KERNEL); if (cmd == NULL) return -ENOMEM; pn533_tx_frame_init(frame, PN533_CMD_TG_INIT_AS_TARGET); /* DEP support only */ cmd->mode |= PN533_INIT_TARGET_DEP; get_random_bytes(cmd->nfcid3, 10); cmd->gb_len = gb_len; memcpy(cmd->gb, gb, gb_len); /* Len Tk */ cmd->gb[gb_len] = 0; memcpy(PN533_FRAME_CMD_PARAMS_PTR(frame), cmd, cmd_len); frame->datalen += cmd_len; pn533_tx_frame_finish(frame); return 0; } #define PN533_CMD_DATAEXCH_HEAD_LEN (sizeof(struct pn533_frame) + 3) #define PN533_CMD_DATAEXCH_DATA_MAXLEN 262 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg, u8 *params, int params_len) { struct sk_buff *skb_resp = arg; struct pn533_frame *in_frame = (struct pn533_frame *) skb_resp->data; nfc_dev_dbg(&dev->interface->dev, "%s", __func__); if (params_len < 0) { nfc_dev_err(&dev->interface->dev, "Error %d when starting as a target", params_len); return params_len; } if (params_len > 0 && params[0] != 0) { nfc_tm_deactivated(dev->nfc_dev); kfree_skb(skb_resp); return 0; } skb_put(skb_resp, PN533_FRAME_SIZE(in_frame)); skb_pull(skb_resp, PN533_CMD_DATAEXCH_HEAD_LEN); skb_trim(skb_resp, skb_resp->len - PN533_FRAME_TAIL_SIZE); return nfc_tm_data_received(dev->nfc_dev, skb_resp); } static void pn533_wq_tg_get_data(struct work_struct *work) { struct pn533 *dev = container_of(work, struct pn533, tg_work); struct pn533_frame *in_frame; struct sk_buff *skb_resp; size_t skb_resp_len; nfc_dev_dbg(&dev->interface->dev, "%s", __func__); skb_resp_len = PN533_CMD_DATAEXCH_HEAD_LEN + PN533_CMD_DATAEXCH_DATA_MAXLEN + PN533_FRAME_TAIL_SIZE; skb_resp = nfc_alloc_recv_skb(skb_resp_len, GFP_KERNEL); if (!skb_resp) return; in_frame = (struct pn533_frame *)skb_resp->data; pn533_tx_frame_init(dev->out_frame, PN533_CMD_TG_GET_DATA); pn533_tx_frame_finish(dev->out_frame); pn533_send_cmd_frame_async(dev, dev->out_frame, in_frame, skb_resp_len, pn533_tm_get_data_complete, skb_resp, GFP_KERNEL); return; } #define ATR_REQ_GB_OFFSET 17 static int pn533_init_target_complete(struct pn533 *dev, void *arg, u8 *params, int params_len) { struct pn533_cmd_init_target_response *resp; u8 frame, comm_mode = NFC_COMM_PASSIVE, *gb; size_t gb_len; int rc; nfc_dev_dbg(&dev->interface->dev, "%s", __func__); if (params_len < 0) { nfc_dev_err(&dev->interface->dev, "Error %d when starting as a target", params_len); return params_len; } if (params_len < ATR_REQ_GB_OFFSET + 1) return -EINVAL; resp = (struct pn533_cmd_init_target_response *) params; nfc_dev_dbg(&dev->interface->dev, "Target mode 0x%x param len %d\n", resp->mode, params_len); frame = resp->mode & PN533_INIT_TARGET_RESP_FRAME_MASK; if (frame == PN533_INIT_TARGET_RESP_ACTIVE) comm_mode = NFC_COMM_ACTIVE; /* Again, only DEP */ if ((resp->mode & PN533_INIT_TARGET_RESP_DEP) == 0) return -EOPNOTSUPP; gb = resp->cmd + ATR_REQ_GB_OFFSET; gb_len = params_len - (ATR_REQ_GB_OFFSET + 1); rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK, comm_mode, gb, gb_len); if (rc < 0) { nfc_dev_err(&dev->interface->dev, "Error when signaling target activation"); return rc; } queue_work(dev->wq, &dev->tg_work); return 0; } static int pn533_init_target(struct nfc_dev *nfc_dev, u32 protocols) { struct pn533 *dev = nfc_get_drvdata(nfc_dev); u8 *gb; size_t gb_len; int rc; pn533_poll_reset_mod_list(dev); gb = nfc_get_local_general_bytes(nfc_dev, &gb_len); if (gb == NULL) return -ENOMEM; rc = pn533_init_target_frame(dev->out_frame, gb, gb_len); if (rc < 0) return rc; rc = pn533_send_cmd_frame_async(dev, dev->out_frame, dev->in_frame, dev->in_maxlen, pn533_init_target_complete, NULL, GFP_KERNEL); if (rc) nfc_dev_err(&dev->interface->dev, "Error %d when trying to initiate as a target", rc); dev->poll_mod_count++; return rc; } static int pn533_start_im_poll(struct nfc_dev *nfc_dev, u32 protocols) { struct pn533 *dev = nfc_get_drvdata(nfc_dev); struct pn533_poll_modulations *start_mod; int rc; if (dev->poll_mod_count) { nfc_dev_err(&dev->interface->dev, "Polling operation already" " active"); return -EBUSY; } pn533_poll_create_mod_list(dev, protocols); if (!dev->poll_mod_count) { nfc_dev_err(&dev->interface->dev, "No valid protocols" " specified"); rc = -EINVAL; goto error; } nfc_dev_dbg(&dev->interface->dev, "It will poll %d modulations types", dev->poll_mod_count); dev->poll_mod_curr = 0; start_mod = dev->poll_mod_active[dev->poll_mod_curr]; pn533_start_poll_frame(dev->out_frame, start_mod); rc = pn533_send_cmd_frame_async(dev, dev->out_frame, dev->in_frame, dev->in_maxlen, pn533_start_poll_complete, NULL, GFP_KERNEL); if (rc) { nfc_dev_err(&dev->interface->dev, "Error %d when trying to" " start poll", rc); goto error; } dev->poll_protocols = protocols; return 0; error: pn533_poll_reset_mod_list(dev); return rc; } static int pn533_start_poll(struct nfc_dev *nfc_dev, u32 im_protocols, u32 tm_protocols) { struct pn533 *dev = nfc_get_drvdata(nfc_dev); nfc_dev_dbg(&dev->interface->dev, "%s: im protocols 0x%x tm protocols 0x%x", __func__, im_protocols, tm_protocols); if (dev->tgt_active_prot) { nfc_dev_err(&dev->interface->dev, "Cannot poll with a target already activated"); return -EBUSY; } if (im_protocols) return pn533_start_im_poll(nfc_dev, im_protocols); if (tm_protocols) return pn533_init_target(nfc_dev, tm_protocols); return -EINVAL; } static void pn533_stop_poll(struct nfc_dev *nfc_dev) { struct pn533 *dev = nfc_get_drvdata(nfc_dev); nfc_dev_dbg(&dev->interface->dev, "%s", __func__); if (!dev->poll_mod_count) { nfc_dev_dbg(&dev->interface->dev, "Polling operation was not" " running"); return; } /* An ack will cancel the last issued command (poll) */ pn533_send_ack(dev, GFP_KERNEL); /* prevent pn533_start_poll_complete to issue a new poll meanwhile */ usb_kill_urb(dev->in_urb); pn533_poll_reset_mod_list(dev); } static int pn533_activate_target_nfcdep(struct pn533 *dev) { struct pn533_cmd_activate_param param; struct pn533_cmd_activate_response *resp; u16 gt_len; int rc; nfc_dev_dbg(&dev->interface->dev, "%s", __func__); pn533_tx_frame_init(dev->out_frame, PN533_CMD_IN_ATR); param.tg = 1; param.next = 0; memcpy(PN533_FRAME_CMD_PARAMS_PTR(dev->out_frame), ¶m, sizeof(struct pn533_cmd_activate_param)); dev->out_frame->datalen += sizeof(struct pn533_cmd_activate_param); pn533_tx_frame_finish(dev->out_frame); rc = pn533_send_cmd_frame_sync(dev, dev->out_frame, dev->in_frame, dev->in_maxlen); if (rc) return rc; resp = (struct pn533_cmd_activate_response *) PN533_FRAME_CMD_PARAMS_PTR(dev->in_frame); rc = resp->status & PN533_CMD_RET_MASK; if (rc != PN533_CMD_RET_SUCCESS) return -EIO; /* ATR_RES general bytes are located at offset 16 */ gt_len = PN533_FRAME_CMD_PARAMS_LEN(dev->in_frame) - 16; rc = nfc_set_remote_general_bytes(dev->nfc_dev, resp->gt, gt_len); return rc; } static int pn533_activate_target(struct nfc_dev *nfc_dev, struct nfc_target *target, u32 protocol) { struct pn533 *dev = nfc_get_drvdata(nfc_dev); int rc; nfc_dev_dbg(&dev->interface->dev, "%s - protocol=%u", __func__, protocol); if (dev->poll_mod_count) { nfc_dev_err(&dev->interface->dev, "Cannot activate while" " polling"); return -EBUSY; } if (dev->tgt_active_prot) { nfc_dev_err(&dev->interface->dev, "There is already an active" " target"); return -EBUSY; } if (!dev->tgt_available_prots) { nfc_dev_err(&dev->interface->dev, "There is no available target" " to activate"); return -EINVAL; } if (!(dev->tgt_available_prots & (1 << protocol))) { nfc_dev_err(&dev->interface->dev, "The target does not support" " the requested protocol %u", protocol); return -EINVAL; } if (protocol == NFC_PROTO_NFC_DEP) { rc = pn533_activate_target_nfcdep(dev); if (rc) { nfc_dev_err(&dev->interface->dev, "Error %d when" " activating target with" " NFC_DEP protocol", rc); return rc; } } dev->tgt_active_prot = protocol; dev->tgt_available_prots = 0; return 0; } static void pn533_deactivate_target(struct nfc_dev *nfc_dev, struct nfc_target *target) { struct pn533 *dev = nfc_get_drvdata(nfc_dev); u8 tg; u8 status; int rc; nfc_dev_dbg(&dev->interface->dev, "%s", __func__); if (!dev->tgt_active_prot) { nfc_dev_err(&dev->interface->dev, "There is no active target"); return; } dev->tgt_active_prot = 0; skb_queue_purge(&dev->resp_q); pn533_tx_frame_init(dev->out_frame, PN533_CMD_IN_RELEASE); tg = 1; memcpy(PN533_FRAME_CMD_PARAMS_PTR(dev->out_frame), &tg, sizeof(u8)); dev->out_frame->datalen += sizeof(u8); pn533_tx_frame_finish(dev->out_frame); rc = pn533_send_cmd_frame_sync(dev, dev->out_frame, dev->in_frame, dev->in_maxlen); if (rc) { nfc_dev_err(&dev->interface->dev, "Error when sending release" " command to the controller"); return; } status = PN533_FRAME_CMD_PARAMS_PTR(dev->in_frame)[0]; rc = status & PN533_CMD_RET_MASK; if (rc != PN533_CMD_RET_SUCCESS) nfc_dev_err(&dev->interface->dev, "Error 0x%x when releasing" " the target", rc); return; } static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg, u8 *params, int params_len) { struct pn533_cmd_jump_dep *cmd; struct pn533_cmd_jump_dep_response *resp; struct nfc_target nfc_target; u8 target_gt_len; int rc; if (params_len == -ENOENT) { nfc_dev_dbg(&dev->interface->dev, ""); return 0; } if (params_len < 0) { nfc_dev_err(&dev->interface->dev, "Error %d when bringing DEP link up", params_len); return 0; } if (dev->tgt_available_prots && !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) { nfc_dev_err(&dev->interface->dev, "The target does not support DEP"); return -EINVAL; } resp = (struct pn533_cmd_jump_dep_response *) params; cmd = (struct pn533_cmd_jump_dep *) arg; rc = resp->status & PN533_CMD_RET_MASK; if (rc != PN533_CMD_RET_SUCCESS) { nfc_dev_err(&dev->interface->dev, "Bringing DEP link up failed %d", rc); return 0; } if (!dev->tgt_available_prots) { nfc_dev_dbg(&dev->interface->dev, "Creating new target"); nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK; nfc_target.nfcid1_len = 10; memcpy(nfc_target.nfcid1, resp->nfcid3t, nfc_target.nfcid1_len); rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1); if (rc) return 0; dev->tgt_available_prots = 0; } dev->tgt_active_prot = NFC_PROTO_NFC_DEP; /* ATR_RES general bytes are located at offset 17 */ target_gt_len = PN533_FRAME_CMD_PARAMS_LEN(dev->in_frame) - 17; rc = nfc_set_remote_general_bytes(dev->nfc_dev, resp->gt, target_gt_len); if (rc == 0) rc = nfc_dep_link_is_up(dev->nfc_dev, dev->nfc_dev->targets[0].idx, !cmd->active, NFC_RF_INITIATOR); return 0; } static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target, u8 comm_mode, u8* gb, size_t gb_len) { struct pn533 *dev = nfc_get_drvdata(nfc_dev); struct pn533_cmd_jump_dep *cmd; u8 cmd_len; int rc; nfc_dev_dbg(&dev->interface->dev, "%s", __func__); if (dev->poll_mod_count) { nfc_dev_err(&dev->interface->dev, "Cannot bring the DEP link up while polling"); return -EBUSY; } if (dev->tgt_active_prot) { nfc_dev_err(&dev->interface->dev, "There is already an active target"); return -EBUSY; } cmd_len = sizeof(struct pn533_cmd_jump_dep) + gb_len; cmd = kzalloc(cmd_len, GFP_KERNEL); if (cmd == NULL) return -ENOMEM; pn533_tx_frame_init(dev->out_frame, PN533_CMD_IN_JUMP_FOR_DEP); cmd->active = !comm_mode; cmd->baud = 0; if (gb != NULL && gb_len > 0) { cmd->next = 4; /* We have some Gi */ memcpy(cmd->gt, gb, gb_len); } else { cmd->next = 0; } memcpy(PN533_FRAME_CMD_PARAMS_PTR(dev->out_frame), cmd, cmd_len); dev->out_frame->datalen += cmd_len; pn533_tx_frame_finish(dev->out_frame); rc = pn533_send_cmd_frame_async(dev, dev->out_frame, dev->in_frame, dev->in_maxlen, pn533_in_dep_link_up_complete, cmd, GFP_KERNEL); if (rc) goto out; out: kfree(cmd); return rc; } static int pn533_dep_link_down(struct nfc_dev *nfc_dev) { pn533_deactivate_target(nfc_dev, 0); return 0; } static int pn533_build_tx_frame(struct pn533 *dev, struct sk_buff *skb, bool target) { int payload_len = skb->len; struct pn533_frame *out_frame; u8 tg; nfc_dev_dbg(&dev->interface->dev, "%s - Sending %d bytes", __func__, payload_len); if (payload_len > PN533_CMD_DATAEXCH_DATA_MAXLEN) { /* TODO: Implement support to multi-part data exchange */ nfc_dev_err(&dev->interface->dev, "Data length greater than the" " max allowed: %d", PN533_CMD_DATAEXCH_DATA_MAXLEN); return -ENOSYS; } if (target == true) { skb_push(skb, PN533_CMD_DATAEXCH_HEAD_LEN); out_frame = (struct pn533_frame *) skb->data; pn533_tx_frame_init(out_frame, PN533_CMD_IN_DATA_EXCHANGE); tg = 1; memcpy(PN533_FRAME_CMD_PARAMS_PTR(out_frame), &tg, sizeof(u8)); out_frame->datalen += sizeof(u8); } else { skb_push(skb, PN533_CMD_DATAEXCH_HEAD_LEN - 1); out_frame = (struct pn533_frame *) skb->data; pn533_tx_frame_init(out_frame, PN533_CMD_TG_SET_DATA); } /* The data is already in the out_frame, just update the datalen */ out_frame->datalen += payload_len; pn533_tx_frame_finish(out_frame); skb_put(skb, PN533_FRAME_TAIL_SIZE); return 0; } struct pn533_data_exchange_arg { struct sk_buff *skb_resp; struct sk_buff *skb_out; data_exchange_cb_t cb; void *cb_context; }; static struct sk_buff *pn533_build_response(struct pn533 *dev) { struct sk_buff *skb, *tmp, *t; unsigned int skb_len = 0, tmp_len = 0; nfc_dev_dbg(&dev->interface->dev, "%s\n", __func__); if (skb_queue_empty(&dev->resp_q)) return NULL; if (skb_queue_len(&dev->resp_q) == 1) { skb = skb_dequeue(&dev->resp_q); goto out; } skb_queue_walk_safe(&dev->resp_q, tmp, t) skb_len += tmp->len; nfc_dev_dbg(&dev->interface->dev, "%s total length %d\n", __func__, skb_len); skb = alloc_skb(skb_len, GFP_KERNEL); if (skb == NULL) goto out; skb_put(skb, skb_len); skb_queue_walk_safe(&dev->resp_q, tmp, t) { memcpy(skb->data + tmp_len, tmp->data, tmp->len); tmp_len += tmp->len; } out: skb_queue_purge(&dev->resp_q); return skb; } static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg, u8 *params, int params_len) { struct pn533_data_exchange_arg *arg = _arg; struct sk_buff *skb = NULL, *skb_resp = arg->skb_resp; struct pn533_frame *in_frame = (struct pn533_frame *) skb_resp->data; int err = 0; u8 status; u8 cmd_ret; nfc_dev_dbg(&dev->interface->dev, "%s", __func__); dev_kfree_skb(arg->skb_out); if (params_len < 0) { /* error */ err = params_len; goto error; } status = params[0]; cmd_ret = status & PN533_CMD_RET_MASK; if (cmd_ret != PN533_CMD_RET_SUCCESS) { nfc_dev_err(&dev->interface->dev, "PN533 reported error %d when" " exchanging data", cmd_ret); err = -EIO; goto error; } skb_put(skb_resp, PN533_FRAME_SIZE(in_frame)); skb_pull(skb_resp, PN533_CMD_DATAEXCH_HEAD_LEN); skb_trim(skb_resp, skb_resp->len - PN533_FRAME_TAIL_SIZE); skb_queue_tail(&dev->resp_q, skb_resp); if (status & PN533_CMD_MI_MASK) { queue_work(dev->wq, &dev->mi_work); return -EINPROGRESS; } skb = pn533_build_response(dev); if (skb == NULL) goto error; arg->cb(arg->cb_context, skb, 0); kfree(arg); return 0; error: skb_queue_purge(&dev->resp_q); dev_kfree_skb(skb_resp); arg->cb(arg->cb_context, NULL, err); kfree(arg); return 0; } static int pn533_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, struct sk_buff *skb, data_exchange_cb_t cb, void *cb_context) { struct pn533 *dev = nfc_get_drvdata(nfc_dev); struct pn533_frame *out_frame, *in_frame; struct pn533_data_exchange_arg *arg; struct sk_buff *skb_resp; int skb_resp_len; int rc; nfc_dev_dbg(&dev->interface->dev, "%s", __func__); if (!dev->tgt_active_prot) { nfc_dev_err(&dev->interface->dev, "Cannot exchange data if" " there is no active target"); rc = -EINVAL; goto error; } rc = pn533_build_tx_frame(dev, skb, true); if (rc) goto error; skb_resp_len = PN533_CMD_DATAEXCH_HEAD_LEN + PN533_CMD_DATAEXCH_DATA_MAXLEN + PN533_FRAME_TAIL_SIZE; skb_resp = nfc_alloc_recv_skb(skb_resp_len, GFP_KERNEL); if (!skb_resp) { rc = -ENOMEM; goto error; } in_frame = (struct pn533_frame *) skb_resp->data; out_frame = (struct pn533_frame *) skb->data; arg = kmalloc(sizeof(struct pn533_data_exchange_arg), GFP_KERNEL); if (!arg) { rc = -ENOMEM; goto free_skb_resp; } arg->skb_resp = skb_resp; arg->skb_out = skb; arg->cb = cb; arg->cb_context = cb_context; rc = pn533_send_cmd_frame_async(dev, out_frame, in_frame, skb_resp_len, pn533_data_exchange_complete, arg, GFP_KERNEL); if (rc) { nfc_dev_err(&dev->interface->dev, "Error %d when trying to" " perform data_exchange", rc); goto free_arg; } return 0; free_arg: kfree(arg); free_skb_resp: kfree_skb(skb_resp); error: kfree_skb(skb); return rc; } static int pn533_tm_send_complete(struct pn533 *dev, void *arg, u8 *params, int params_len) { nfc_dev_dbg(&dev->interface->dev, "%s", __func__); if (params_len < 0) { nfc_dev_err(&dev->interface->dev, "Error %d when sending data", params_len); return params_len; } if (params_len > 0 && params[0] != 0) { nfc_tm_deactivated(dev->nfc_dev); return 0; } queue_work(dev->wq, &dev->tg_work); return 0; } static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb) { struct pn533 *dev = nfc_get_drvdata(nfc_dev); struct pn533_frame *out_frame; int rc; nfc_dev_dbg(&dev->interface->dev, "%s", __func__); rc = pn533_build_tx_frame(dev, skb, false); if (rc) goto error; out_frame = (struct pn533_frame *) skb->data; rc = pn533_send_cmd_frame_async(dev, out_frame, dev->in_frame, dev->in_maxlen, pn533_tm_send_complete, NULL, GFP_KERNEL); if (rc) { nfc_dev_err(&dev->interface->dev, "Error %d when trying to send data", rc); goto error; } return 0; error: kfree_skb(skb); return rc; } static void pn533_wq_mi_recv(struct work_struct *work) { struct pn533 *dev = container_of(work, struct pn533, mi_work); struct sk_buff *skb_cmd; struct pn533_data_exchange_arg *arg = dev->cmd_complete_arg; struct pn533_frame *out_frame, *in_frame; struct sk_buff *skb_resp; int skb_resp_len; int rc; nfc_dev_dbg(&dev->interface->dev, "%s", __func__); /* This is a zero payload size skb */ skb_cmd = alloc_skb(PN533_CMD_DATAEXCH_HEAD_LEN + PN533_FRAME_TAIL_SIZE, GFP_KERNEL); if (skb_cmd == NULL) goto error_cmd; skb_reserve(skb_cmd, PN533_CMD_DATAEXCH_HEAD_LEN); rc = pn533_build_tx_frame(dev, skb_cmd, true); if (rc) goto error_frame; skb_resp_len = PN533_CMD_DATAEXCH_HEAD_LEN + PN533_CMD_DATAEXCH_DATA_MAXLEN + PN533_FRAME_TAIL_SIZE; skb_resp = alloc_skb(skb_resp_len, GFP_KERNEL); if (!skb_resp) { rc = -ENOMEM; goto error_frame; } in_frame = (struct pn533_frame *) skb_resp->data; out_frame = (struct pn533_frame *) skb_cmd->data; arg->skb_resp = skb_resp; arg->skb_out = skb_cmd; rc = __pn533_send_cmd_frame_async(dev, out_frame, in_frame, skb_resp_len, pn533_data_exchange_complete, dev->cmd_complete_arg, GFP_KERNEL); if (!rc) return; nfc_dev_err(&dev->interface->dev, "Error %d when trying to" " perform data_exchange", rc); kfree_skb(skb_resp); error_frame: kfree_skb(skb_cmd); error_cmd: pn533_send_ack(dev, GFP_KERNEL); kfree(arg); up(&dev->cmd_lock); } static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata, u8 cfgdata_len) { int rc; u8 *params; nfc_dev_dbg(&dev->interface->dev, "%s", __func__); pn533_tx_frame_init(dev->out_frame, PN533_CMD_RF_CONFIGURATION); params = PN533_FRAME_CMD_PARAMS_PTR(dev->out_frame); params[0] = cfgitem; memcpy(¶ms[1], cfgdata, cfgdata_len); dev->out_frame->datalen += (1 + cfgdata_len); pn533_tx_frame_finish(dev->out_frame); rc = pn533_send_cmd_frame_sync(dev, dev->out_frame, dev->in_frame, dev->in_maxlen); return rc; } struct nfc_ops pn533_nfc_ops = { .dev_up = NULL, .dev_down = NULL, .dep_link_up = pn533_dep_link_up, .dep_link_down = pn533_dep_link_down, .start_poll = pn533_start_poll, .stop_poll = pn533_stop_poll, .activate_target = pn533_activate_target, .deactivate_target = pn533_deactivate_target, .im_transceive = pn533_transceive, .tm_send = pn533_tm_send, }; static int pn533_probe(struct usb_interface *interface, const struct usb_device_id *id) { struct pn533_fw_version *fw_ver; struct pn533 *dev; struct usb_host_interface *iface_desc; struct usb_endpoint_descriptor *endpoint; struct pn533_config_max_retries max_retries; int in_endpoint = 0; int out_endpoint = 0; int rc = -ENOMEM; int i; u32 protocols; dev = kzalloc(sizeof(*dev), GFP_KERNEL); if (!dev) return -ENOMEM; dev->udev = usb_get_dev(interface_to_usbdev(interface)); dev->interface = interface; sema_init(&dev->cmd_lock, 1); iface_desc = interface->cur_altsetting; for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { endpoint = &iface_desc->endpoint[i].desc; if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint)) { dev->in_maxlen = le16_to_cpu(endpoint->wMaxPacketSize); in_endpoint = endpoint->bEndpointAddress; } if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint)) { dev->out_maxlen = le16_to_cpu(endpoint->wMaxPacketSize); out_endpoint = endpoint->bEndpointAddress; } } if (!in_endpoint || !out_endpoint) { nfc_dev_err(&interface->dev, "Could not find bulk-in or" " bulk-out endpoint"); rc = -ENODEV; goto error; } dev->in_frame = kmalloc(dev->in_maxlen, GFP_KERNEL); dev->in_urb = usb_alloc_urb(0, GFP_KERNEL); dev->out_frame = kmalloc(dev->out_maxlen, GFP_KERNEL); dev->out_urb = usb_alloc_urb(0, GFP_KERNEL); if (!dev->in_frame || !dev->out_frame || !dev->in_urb || !dev->out_urb) goto error; usb_fill_bulk_urb(dev->in_urb, dev->udev, usb_rcvbulkpipe(dev->udev, in_endpoint), NULL, 0, NULL, dev); usb_fill_bulk_urb(dev->out_urb, dev->udev, usb_sndbulkpipe(dev->udev, out_endpoint), NULL, 0, pn533_send_complete, dev); INIT_WORK(&dev->cmd_work, pn533_wq_cmd_complete); INIT_WORK(&dev->mi_work, pn533_wq_mi_recv); INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data); dev->wq = alloc_workqueue("pn533", WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1); if (dev->wq == NULL) goto error; skb_queue_head_init(&dev->resp_q); usb_set_intfdata(interface, dev); pn533_tx_frame_init(dev->out_frame, PN533_CMD_GET_FIRMWARE_VERSION); pn533_tx_frame_finish(dev->out_frame); rc = pn533_send_cmd_frame_sync(dev, dev->out_frame, dev->in_frame, dev->in_maxlen); if (rc) goto destroy_wq; fw_ver = (struct pn533_fw_version *) PN533_FRAME_CMD_PARAMS_PTR(dev->in_frame); nfc_dev_info(&dev->interface->dev, "NXP PN533 firmware ver %d.%d now" " attached", fw_ver->ver, fw_ver->rev); protocols = NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | NFC_PROTO_FELICA_MASK | NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK; dev->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols, PN533_CMD_DATAEXCH_HEAD_LEN, PN533_FRAME_TAIL_SIZE); if (!dev->nfc_dev) goto destroy_wq; nfc_set_parent_dev(dev->nfc_dev, &interface->dev); nfc_set_drvdata(dev->nfc_dev, dev); rc = nfc_register_device(dev->nfc_dev); if (rc) goto free_nfc_dev; max_retries.mx_rty_atr = PN533_CONFIG_MAX_RETRIES_ENDLESS; max_retries.mx_rty_psl = 2; max_retries.mx_rty_passive_act = PN533_CONFIG_MAX_RETRIES_NO_RETRY; rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES, (u8 *) &max_retries, sizeof(max_retries)); if (rc) { nfc_dev_err(&dev->interface->dev, "Error on setting MAX_RETRIES" " config"); goto free_nfc_dev; } return 0; free_nfc_dev: nfc_free_device(dev->nfc_dev); destroy_wq: destroy_workqueue(dev->wq); error: kfree(dev->in_frame); usb_free_urb(dev->in_urb); kfree(dev->out_frame); usb_free_urb(dev->out_urb); kfree(dev); return rc; } static void pn533_disconnect(struct usb_interface *interface) { struct pn533 *dev; dev = usb_get_intfdata(interface); usb_set_intfdata(interface, NULL); nfc_unregister_device(dev->nfc_dev); nfc_free_device(dev->nfc_dev); usb_kill_urb(dev->in_urb); usb_kill_urb(dev->out_urb); destroy_workqueue(dev->wq); skb_queue_purge(&dev->resp_q); kfree(dev->in_frame); usb_free_urb(dev->in_urb); kfree(dev->out_frame); usb_free_urb(dev->out_urb); kfree(dev); nfc_dev_info(&interface->dev, "NXP PN533 NFC device disconnected"); } static struct usb_driver pn533_driver = { .name = "pn533", .probe = pn533_probe, .disconnect = pn533_disconnect, .id_table = pn533_table, }; module_usb_driver(pn533_driver); MODULE_AUTHOR("Lauro Ramos Venancio ," " Aloisio Almeida Jr "); MODULE_DESCRIPTION("PN533 usb driver ver " VERSION); MODULE_VERSION(VERSION); MODULE_LICENSE("GPL");