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372 lines
8.9 KiB
372 lines
8.9 KiB
/*
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* Copyright (C) 2012 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#define pr_fmt(fmt) "hci: %s: " fmt, __func__
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/module.h>
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#include <net/nfc/hci.h>
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#include "hci.h"
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#define MAX_FWI 4949
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static int nfc_hci_execute_cmd_async(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
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const u8 *param, size_t param_len,
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data_exchange_cb_t cb, void *cb_context)
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{
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pr_debug("exec cmd async through pipe=%d, cmd=%d, plen=%zd\n", pipe,
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cmd, param_len);
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/* TODO: Define hci cmd execution delay. Should it be the same
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* for all commands?
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*/
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return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_COMMAND, cmd,
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param, param_len, cb, cb_context, MAX_FWI);
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}
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/*
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* HCI command execution completion callback.
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* err will be a standard linux error (may be converted from HCI response)
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* skb contains the response data and must be disposed, or may be NULL if
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* an error occured
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*/
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static void nfc_hci_execute_cb(void *context, struct sk_buff *skb, int err)
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{
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struct hcp_exec_waiter *hcp_ew = (struct hcp_exec_waiter *)context;
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pr_debug("HCI Cmd completed with result=%d\n", err);
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hcp_ew->exec_result = err;
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if (hcp_ew->exec_result == 0)
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hcp_ew->result_skb = skb;
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else
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kfree_skb(skb);
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hcp_ew->exec_complete = true;
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wake_up(hcp_ew->wq);
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}
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static int nfc_hci_execute_cmd(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
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const u8 *param, size_t param_len,
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struct sk_buff **skb)
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{
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DECLARE_WAIT_QUEUE_HEAD_ONSTACK(ew_wq);
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struct hcp_exec_waiter hcp_ew;
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hcp_ew.wq = &ew_wq;
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hcp_ew.exec_complete = false;
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hcp_ew.result_skb = NULL;
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pr_debug("exec cmd sync through pipe=%d, cmd=%d, plen=%zd\n", pipe,
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cmd, param_len);
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/* TODO: Define hci cmd execution delay. Should it be the same
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* for all commands?
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*/
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hcp_ew.exec_result = nfc_hci_hcp_message_tx(hdev, pipe,
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NFC_HCI_HCP_COMMAND, cmd,
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param, param_len,
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nfc_hci_execute_cb, &hcp_ew,
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MAX_FWI);
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if (hcp_ew.exec_result < 0)
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return hcp_ew.exec_result;
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wait_event(ew_wq, hcp_ew.exec_complete == true);
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if (hcp_ew.exec_result == 0) {
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if (skb)
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*skb = hcp_ew.result_skb;
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else
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kfree_skb(hcp_ew.result_skb);
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}
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return hcp_ew.exec_result;
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}
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int nfc_hci_send_event(struct nfc_hci_dev *hdev, u8 gate, u8 event,
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const u8 *param, size_t param_len)
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{
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u8 pipe;
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pr_debug("%d to gate %d\n", event, gate);
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pipe = hdev->gate2pipe[gate];
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if (pipe == NFC_HCI_INVALID_PIPE)
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return -EADDRNOTAVAIL;
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return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_EVENT, event,
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param, param_len, NULL, NULL, 0);
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}
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EXPORT_SYMBOL(nfc_hci_send_event);
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/*
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* Execute an hci command sent to gate.
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* skb will contain response data if success. skb can be NULL if you are not
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* interested by the response.
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*/
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int nfc_hci_send_cmd(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
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const u8 *param, size_t param_len, struct sk_buff **skb)
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{
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u8 pipe;
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pr_debug("\n");
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pipe = hdev->gate2pipe[gate];
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if (pipe == NFC_HCI_INVALID_PIPE)
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return -EADDRNOTAVAIL;
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return nfc_hci_execute_cmd(hdev, pipe, cmd, param, param_len, skb);
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}
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EXPORT_SYMBOL(nfc_hci_send_cmd);
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int nfc_hci_send_cmd_async(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
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const u8 *param, size_t param_len,
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data_exchange_cb_t cb, void *cb_context)
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{
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u8 pipe;
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pr_debug("\n");
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pipe = hdev->gate2pipe[gate];
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if (pipe == NFC_HCI_INVALID_PIPE)
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return -EADDRNOTAVAIL;
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return nfc_hci_execute_cmd_async(hdev, pipe, cmd, param, param_len,
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cb, cb_context);
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}
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EXPORT_SYMBOL(nfc_hci_send_cmd_async);
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int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
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const u8 *param, size_t param_len)
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{
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int r;
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u8 *tmp;
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/* TODO ELa: reg idx must be inserted before param, but we don't want
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* to ask the caller to do it to keep a simpler API.
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* For now, just create a new temporary param buffer. This is far from
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* optimal though, and the plan is to modify APIs to pass idx down to
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* nfc_hci_hcp_message_tx where the frame is actually built, thereby
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* eliminating the need for the temp allocation-copy here.
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*/
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pr_debug("idx=%d to gate %d\n", idx, gate);
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tmp = kmalloc(1 + param_len, GFP_KERNEL);
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if (tmp == NULL)
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return -ENOMEM;
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*tmp = idx;
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memcpy(tmp + 1, param, param_len);
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r = nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_SET_PARAMETER,
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tmp, param_len + 1, NULL);
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kfree(tmp);
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return r;
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}
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EXPORT_SYMBOL(nfc_hci_set_param);
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int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
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struct sk_buff **skb)
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{
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pr_debug("gate=%d regidx=%d\n", gate, idx);
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return nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_GET_PARAMETER,
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&idx, 1, skb);
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}
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EXPORT_SYMBOL(nfc_hci_get_param);
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static int nfc_hci_open_pipe(struct nfc_hci_dev *hdev, u8 pipe)
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{
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struct sk_buff *skb;
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int r;
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pr_debug("pipe=%d\n", pipe);
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r = nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_OPEN_PIPE,
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NULL, 0, &skb);
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if (r == 0) {
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/* dest host other than host controller will send
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* number of pipes already open on this gate before
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* execution. The number can be found in skb->data[0]
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*/
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kfree_skb(skb);
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}
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return r;
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}
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static int nfc_hci_close_pipe(struct nfc_hci_dev *hdev, u8 pipe)
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{
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pr_debug("\n");
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return nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_CLOSE_PIPE,
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NULL, 0, NULL);
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}
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static u8 nfc_hci_create_pipe(struct nfc_hci_dev *hdev, u8 dest_host,
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u8 dest_gate, int *result)
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{
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struct sk_buff *skb;
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struct hci_create_pipe_params params;
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struct hci_create_pipe_resp *resp;
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u8 pipe;
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pr_debug("gate=%d\n", dest_gate);
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params.src_gate = NFC_HCI_ADMIN_GATE;
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params.dest_host = dest_host;
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params.dest_gate = dest_gate;
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*result = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
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NFC_HCI_ADM_CREATE_PIPE,
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(u8 *) ¶ms, sizeof(params), &skb);
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if (*result < 0)
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return NFC_HCI_INVALID_PIPE;
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resp = (struct hci_create_pipe_resp *)skb->data;
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pipe = resp->pipe;
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kfree_skb(skb);
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pr_debug("pipe created=%d\n", pipe);
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return pipe;
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}
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static int nfc_hci_delete_pipe(struct nfc_hci_dev *hdev, u8 pipe)
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{
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pr_debug("\n");
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return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
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NFC_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
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}
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static int nfc_hci_clear_all_pipes(struct nfc_hci_dev *hdev)
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{
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u8 param[2];
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size_t param_len = 2;
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/* TODO: Find out what the identity reference data is
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* and fill param with it. HCI spec 6.1.3.5 */
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pr_debug("\n");
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if (test_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &hdev->quirks))
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param_len = 0;
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return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
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NFC_HCI_ADM_CLEAR_ALL_PIPE, param, param_len,
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NULL);
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}
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int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate)
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{
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int r;
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u8 pipe = hdev->gate2pipe[gate];
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pr_debug("\n");
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if (pipe == NFC_HCI_INVALID_PIPE)
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return -EADDRNOTAVAIL;
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r = nfc_hci_close_pipe(hdev, pipe);
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if (r < 0)
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return r;
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if (pipe != NFC_HCI_LINK_MGMT_PIPE && pipe != NFC_HCI_ADMIN_PIPE) {
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r = nfc_hci_delete_pipe(hdev, pipe);
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if (r < 0)
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return r;
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}
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hdev->gate2pipe[gate] = NFC_HCI_INVALID_PIPE;
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return 0;
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}
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EXPORT_SYMBOL(nfc_hci_disconnect_gate);
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int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev)
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{
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int r;
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pr_debug("\n");
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r = nfc_hci_clear_all_pipes(hdev);
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if (r < 0)
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return r;
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nfc_hci_reset_pipes(hdev);
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return 0;
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}
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EXPORT_SYMBOL(nfc_hci_disconnect_all_gates);
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int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate,
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u8 pipe)
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{
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bool pipe_created = false;
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int r;
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pr_debug("\n");
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if (pipe == NFC_HCI_DO_NOT_CREATE_PIPE)
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return 0;
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if (hdev->gate2pipe[dest_gate] != NFC_HCI_INVALID_PIPE)
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return -EADDRINUSE;
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if (pipe != NFC_HCI_INVALID_PIPE)
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goto open_pipe;
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switch (dest_gate) {
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case NFC_HCI_LINK_MGMT_GATE:
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pipe = NFC_HCI_LINK_MGMT_PIPE;
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break;
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case NFC_HCI_ADMIN_GATE:
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pipe = NFC_HCI_ADMIN_PIPE;
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break;
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default:
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pipe = nfc_hci_create_pipe(hdev, dest_host, dest_gate, &r);
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if (pipe == NFC_HCI_INVALID_PIPE)
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return r;
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pipe_created = true;
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break;
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}
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open_pipe:
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r = nfc_hci_open_pipe(hdev, pipe);
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if (r < 0) {
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if (pipe_created)
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if (nfc_hci_delete_pipe(hdev, pipe) < 0) {
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/* TODO: Cannot clean by deleting pipe...
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* -> inconsistent state */
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}
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return r;
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}
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hdev->pipes[pipe].gate = dest_gate;
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hdev->pipes[pipe].dest_host = dest_host;
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hdev->gate2pipe[dest_gate] = pipe;
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return 0;
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}
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EXPORT_SYMBOL(nfc_hci_connect_gate);
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