/* * Copyright (C) 2012 Intel Corporation. All rights reserved. * * 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, see . */ #define pr_fmt(fmt) "hci: %s: " fmt, __func__ #include #include #include #include #include #include "hci.h" static int nfc_hci_execute_cmd_async(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd, const u8 *param, size_t param_len, data_exchange_cb_t cb, void *cb_context) { pr_debug("exec cmd async through pipe=%d, cmd=%d, plen=%zd\n", pipe, cmd, param_len); /* TODO: Define hci cmd execution delay. Should it be the same * for all commands? */ return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_COMMAND, cmd, param, param_len, cb, cb_context, 3000); } /* * HCI command execution completion callback. * err will be a standard linux error (may be converted from HCI response) * skb contains the response data and must be disposed, or may be NULL if * an error occured */ static void nfc_hci_execute_cb(void *context, struct sk_buff *skb, int err) { struct hcp_exec_waiter *hcp_ew = (struct hcp_exec_waiter *)context; pr_debug("HCI Cmd completed with result=%d\n", err); hcp_ew->exec_result = err; if (hcp_ew->exec_result == 0) hcp_ew->result_skb = skb; else kfree_skb(skb); hcp_ew->exec_complete = true; wake_up(hcp_ew->wq); } static int nfc_hci_execute_cmd(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd, const u8 *param, size_t param_len, struct sk_buff **skb) { DECLARE_WAIT_QUEUE_HEAD_ONSTACK(ew_wq); struct hcp_exec_waiter hcp_ew; hcp_ew.wq = &ew_wq; hcp_ew.exec_complete = false; hcp_ew.result_skb = NULL; pr_debug("exec cmd sync through pipe=%d, cmd=%d, plen=%zd\n", pipe, cmd, param_len); /* TODO: Define hci cmd execution delay. Should it be the same * for all commands? */ hcp_ew.exec_result = nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_COMMAND, cmd, param, param_len, nfc_hci_execute_cb, &hcp_ew, 3000); if (hcp_ew.exec_result < 0) return hcp_ew.exec_result; wait_event(ew_wq, hcp_ew.exec_complete == true); if (hcp_ew.exec_result == 0) { if (skb) *skb = hcp_ew.result_skb; else kfree_skb(hcp_ew.result_skb); } return hcp_ew.exec_result; } int nfc_hci_send_event(struct nfc_hci_dev *hdev, u8 gate, u8 event, const u8 *param, size_t param_len) { u8 pipe; pr_debug("%d to gate %d\n", event, gate); pipe = hdev->gate2pipe[gate]; if (pipe == NFC_HCI_INVALID_PIPE) return -EADDRNOTAVAIL; return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_EVENT, event, param, param_len, NULL, NULL, 0); } EXPORT_SYMBOL(nfc_hci_send_event); int nfc_hci_send_response(struct nfc_hci_dev *hdev, u8 gate, u8 response, const u8 *param, size_t param_len) { u8 pipe; pr_debug("\n"); pipe = hdev->gate2pipe[gate]; if (pipe == NFC_HCI_INVALID_PIPE) return -EADDRNOTAVAIL; return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE, response, param, param_len, NULL, NULL, 0); } EXPORT_SYMBOL(nfc_hci_send_response); /* * Execute an hci command sent to gate. * skb will contain response data if success. skb can be NULL if you are not * interested by the response. */ int nfc_hci_send_cmd(struct nfc_hci_dev *hdev, u8 gate, u8 cmd, const u8 *param, size_t param_len, struct sk_buff **skb) { u8 pipe; pr_debug("\n"); pipe = hdev->gate2pipe[gate]; if (pipe == NFC_HCI_INVALID_PIPE) return -EADDRNOTAVAIL; return nfc_hci_execute_cmd(hdev, pipe, cmd, param, param_len, skb); } EXPORT_SYMBOL(nfc_hci_send_cmd); int nfc_hci_send_cmd_async(struct nfc_hci_dev *hdev, u8 gate, u8 cmd, const u8 *param, size_t param_len, data_exchange_cb_t cb, void *cb_context) { u8 pipe; pr_debug("\n"); pipe = hdev->gate2pipe[gate]; if (pipe == NFC_HCI_INVALID_PIPE) return -EADDRNOTAVAIL; return nfc_hci_execute_cmd_async(hdev, pipe, cmd, param, param_len, cb, cb_context); } EXPORT_SYMBOL(nfc_hci_send_cmd_async); int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx, const u8 *param, size_t param_len) { int r; u8 *tmp; /* TODO ELa: reg idx must be inserted before param, but we don't want * to ask the caller to do it to keep a simpler API. * For now, just create a new temporary param buffer. This is far from * optimal though, and the plan is to modify APIs to pass idx down to * nfc_hci_hcp_message_tx where the frame is actually built, thereby * eliminating the need for the temp allocation-copy here. */ pr_debug("idx=%d to gate %d\n", idx, gate); tmp = kmalloc(1 + param_len, GFP_KERNEL); if (tmp == NULL) return -ENOMEM; *tmp = idx; memcpy(tmp + 1, param, param_len); r = nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_SET_PARAMETER, tmp, param_len + 1, NULL); kfree(tmp); return r; } EXPORT_SYMBOL(nfc_hci_set_param); int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx, struct sk_buff **skb) { pr_debug("gate=%d regidx=%d\n", gate, idx); return nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_GET_PARAMETER, &idx, 1, skb); } EXPORT_SYMBOL(nfc_hci_get_param); static int nfc_hci_open_pipe(struct nfc_hci_dev *hdev, u8 pipe) { struct sk_buff *skb; int r; pr_debug("pipe=%d\n", pipe); r = nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_OPEN_PIPE, NULL, 0, &skb); if (r == 0) { /* dest host other than host controller will send * number of pipes already open on this gate before * execution. The number can be found in skb->data[0] */ kfree_skb(skb); } return r; } static int nfc_hci_close_pipe(struct nfc_hci_dev *hdev, u8 pipe) { pr_debug("\n"); return nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_CLOSE_PIPE, NULL, 0, NULL); } static u8 nfc_hci_create_pipe(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate, int *result) { struct sk_buff *skb; struct hci_create_pipe_params params; struct hci_create_pipe_resp *resp; u8 pipe; pr_debug("gate=%d\n", dest_gate); params.src_gate = NFC_HCI_ADMIN_GATE; params.dest_host = dest_host; params.dest_gate = dest_gate; *result = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE, NFC_HCI_ADM_CREATE_PIPE, (u8 *) ¶ms, sizeof(params), &skb); if (*result < 0) return NFC_HCI_INVALID_PIPE; resp = (struct hci_create_pipe_resp *)skb->data; pipe = resp->pipe; kfree_skb(skb); pr_debug("pipe created=%d\n", pipe); return pipe; } static int nfc_hci_delete_pipe(struct nfc_hci_dev *hdev, u8 pipe) { pr_debug("\n"); return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE, NFC_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL); } static int nfc_hci_clear_all_pipes(struct nfc_hci_dev *hdev) { u8 param[2]; size_t param_len = 2; /* TODO: Find out what the identity reference data is * and fill param with it. HCI spec 6.1.3.5 */ pr_debug("\n"); if (test_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &hdev->quirks)) param_len = 0; return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE, NFC_HCI_ADM_CLEAR_ALL_PIPE, param, param_len, NULL); } int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate) { int r; u8 pipe = hdev->gate2pipe[gate]; pr_debug("\n"); if (pipe == NFC_HCI_INVALID_PIPE) return -EADDRNOTAVAIL; r = nfc_hci_close_pipe(hdev, pipe); if (r < 0) return r; if (pipe != NFC_HCI_LINK_MGMT_PIPE && pipe != NFC_HCI_ADMIN_PIPE) { r = nfc_hci_delete_pipe(hdev, pipe); if (r < 0) return r; } hdev->gate2pipe[gate] = NFC_HCI_INVALID_PIPE; return 0; } EXPORT_SYMBOL(nfc_hci_disconnect_gate); int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev) { int r; pr_debug("\n"); r = nfc_hci_clear_all_pipes(hdev); if (r < 0) return r; memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); return 0; } EXPORT_SYMBOL(nfc_hci_disconnect_all_gates); int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate, u8 pipe) { bool pipe_created = false; int r; pr_debug("\n"); if (hdev->gate2pipe[dest_gate] != NFC_HCI_INVALID_PIPE) return -EADDRINUSE; if (pipe != NFC_HCI_INVALID_PIPE) goto open_pipe; switch (dest_gate) { case NFC_HCI_LINK_MGMT_GATE: pipe = NFC_HCI_LINK_MGMT_PIPE; break; case NFC_HCI_ADMIN_GATE: pipe = NFC_HCI_ADMIN_PIPE; break; default: pipe = nfc_hci_create_pipe(hdev, dest_host, dest_gate, &r); if (pipe == NFC_HCI_INVALID_PIPE) return r; pipe_created = true; break; } open_pipe: r = nfc_hci_open_pipe(hdev, pipe); if (r < 0) { if (pipe_created) if (nfc_hci_delete_pipe(hdev, pipe) < 0) { /* TODO: Cannot clean by deleting pipe... * -> inconsistent state */ } return r; } hdev->gate2pipe[dest_gate] = pipe; return 0; } EXPORT_SYMBOL(nfc_hci_connect_gate);