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360 lines
8.3 KiB
360 lines
8.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2012 Intel Corporation. All rights reserved. |
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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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