[deliverable/linux.git] / net / nfc / hci / command.c

/*
 * 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 <http://www.gnu.org/licenses/>.
 */

#define pr_fmt(fmt) "hci: %s: " fmt, __func__

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/module.h>

#include <net/nfc/hci.h>

#include "hci.h"

#define MAX_FWI 4949

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, MAX_FWI);
}

/*
 * 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,
						    MAX_FWI);
	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);

/*
 * 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 *) &params, 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;

	nfc_hci_reset_pipes(hdev);

	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 (pipe == NFC_HCI_DO_NOT_CREATE_PIPE)
		return 0;

	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->pipes[pipe].gate = dest_gate;
	hdev->pipes[pipe].dest_host = dest_host;
	hdev->gate2pipe[dest_gate] = pipe;

	return 0;
}
EXPORT_SYMBOL(nfc_hci_connect_gate);
Commit	Line	Data
8b8d2e08 EL	1	/*
	2	* Copyright (C) 2012 Intel Corporation. All rights reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
98b32dec	15	* along with this program; if not, see <http://www.gnu.org/licenses/>.
8b8d2e08 EL	16	*/
	17
	18	#define pr_fmt(fmt) "hci: %s: " fmt, __func__
	19
	20	#include <linux/init.h>
	21	#include <linux/kernel.h>
	22	#include <linux/sched.h>
	23	#include <linux/module.h>
	24
	25	#include <net/nfc/hci.h>
	26
	27	#include "hci.h"
	28
d330905d CR	29	#define MAX_FWI 4949
d330905d CR	30
e4c4789e EL	31	static int nfc_hci_execute_cmd_async(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
	32	const u8 *param, size_t param_len,
	33	data_exchange_cb_t cb, void *cb_context)
	34	{
	35	pr_debug("exec cmd async through pipe=%d, cmd=%d, plen=%zd\n", pipe,
	36	cmd, param_len);
	37
	38	/* TODO: Define hci cmd execution delay. Should it be the same
	39	* for all commands?
	40	*/
	41	return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_COMMAND, cmd,
d330905d	42	param, param_len, cb, cb_context, MAX_FWI);
e4c4789e EL	43	}
e4c4789e EL	44
b5faa648 EL	45	/*
	46	* HCI command execution completion callback.
	47	* err will be a standard linux error (may be converted from HCI response)
	48	* skb contains the response data and must be disposed, or may be NULL if
	49	* an error occured
	50	*/
	51	static void nfc_hci_execute_cb(void context, struct sk_buff skb, int err)
8b8d2e08	52	{
b5faa648	53	struct hcp_exec_waiter hcp_ew = (struct hcp_exec_waiter )context;
8b8d2e08	54
6c1c5b9e	55	pr_debug("HCI Cmd completed with result=%d\n", err);
8b8d2e08	56
6c1c5b9e	57	hcp_ew->exec_result = err;
8b8d2e08 EL	58	if (hcp_ew->exec_result == 0)
	59	hcp_ew->result_skb = skb;
	60	else
	61	kfree_skb(skb);
	62	hcp_ew->exec_complete = true;
	63
	64	wake_up(hcp_ew->wq);
	65	}
	66
	67	static int nfc_hci_execute_cmd(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
	68	const u8 *param, size_t param_len,
	69	struct sk_buff **skb)
	70	{
	71	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(ew_wq);
	72	struct hcp_exec_waiter hcp_ew;
	73	hcp_ew.wq = &ew_wq;
	74	hcp_ew.exec_complete = false;
	75	hcp_ew.result_skb = NULL;
	76
e4c4789e EL	77	pr_debug("exec cmd sync through pipe=%d, cmd=%d, plen=%zd\n", pipe,
e4c4789e EL	78	cmd, param_len);
8b8d2e08 EL	79
	80	/* TODO: Define hci cmd execution delay. Should it be the same
	81	* for all commands?
	82	*/
	83	hcp_ew.exec_result = nfc_hci_hcp_message_tx(hdev, pipe,
	84	NFC_HCI_HCP_COMMAND, cmd,
	85	param, param_len,
	86	nfc_hci_execute_cb, &hcp_ew,
d330905d	87	MAX_FWI);
8b8d2e08 EL	88	if (hcp_ew.exec_result < 0)
	89	return hcp_ew.exec_result;
	90
	91	wait_event(ew_wq, hcp_ew.exec_complete == true);
	92
	93	if (hcp_ew.exec_result == 0) {
	94	if (skb)
	95	*skb = hcp_ew.result_skb;
	96	else
	97	kfree_skb(hcp_ew.result_skb);
	98	}
	99
	100	return hcp_ew.exec_result;
	101	}
	102
	103	int nfc_hci_send_event(struct nfc_hci_dev *hdev, u8 gate, u8 event,
	104	const u8 *param, size_t param_len)
	105	{
	106	u8 pipe;
	107
	108	pr_debug("%d to gate %d\n", event, gate);
	109
	110	pipe = hdev->gate2pipe[gate];
	111	if (pipe == NFC_HCI_INVALID_PIPE)
	112	return -EADDRNOTAVAIL;
	113
	114	return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_EVENT, event,
	115	param, param_len, NULL, NULL, 0);
	116	}
	117	EXPORT_SYMBOL(nfc_hci_send_event);
	118
8b8d2e08 EL	119	/*
	120	* Execute an hci command sent to gate.
	121	* skb will contain response data if success. skb can be NULL if you are not
	122	* interested by the response.
	123	*/
	124	int nfc_hci_send_cmd(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
	125	const u8 param, size_t param_len, struct sk_buff *skb)
	126	{
	127	u8 pipe;
	128
	129	pr_debug("\n");
	130
	131	pipe = hdev->gate2pipe[gate];
	132	if (pipe == NFC_HCI_INVALID_PIPE)
	133	return -EADDRNOTAVAIL;
	134
	135	return nfc_hci_execute_cmd(hdev, pipe, cmd, param, param_len, skb);
	136	}
	137	EXPORT_SYMBOL(nfc_hci_send_cmd);
	138
e4c4789e EL	139	int nfc_hci_send_cmd_async(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
	140	const u8 *param, size_t param_len,
	141	data_exchange_cb_t cb, void *cb_context)
	142	{
	143	u8 pipe;
	144
	145	pr_debug("\n");
	146
	147	pipe = hdev->gate2pipe[gate];
	148	if (pipe == NFC_HCI_INVALID_PIPE)
	149	return -EADDRNOTAVAIL;
	150
	151	return nfc_hci_execute_cmd_async(hdev, pipe, cmd, param, param_len,
	152	cb, cb_context);
	153	}
	154	EXPORT_SYMBOL(nfc_hci_send_cmd_async);
	155
8b8d2e08 EL	156	int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
	157	const u8 *param, size_t param_len)
	158	{
	159	int r;
	160	u8 *tmp;
	161
	162	/* TODO ELa: reg idx must be inserted before param, but we don't want
	163	* to ask the caller to do it to keep a simpler API.
	164	* For now, just create a new temporary param buffer. This is far from
	165	* optimal though, and the plan is to modify APIs to pass idx down to
	166	* nfc_hci_hcp_message_tx where the frame is actually built, thereby
	167	* eliminating the need for the temp allocation-copy here.
	168	*/
	169
	170	pr_debug("idx=%d to gate %d\n", idx, gate);
	171
	172	tmp = kmalloc(1 + param_len, GFP_KERNEL);
	173	if (tmp == NULL)
	174	return -ENOMEM;
	175
	176	*tmp = idx;
	177	memcpy(tmp + 1, param, param_len);
	178
	179	r = nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_SET_PARAMETER,
	180	tmp, param_len + 1, NULL);
	181
	182	kfree(tmp);
	183
	184	return r;
	185	}
	186	EXPORT_SYMBOL(nfc_hci_set_param);
	187
	188	int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
	189	struct sk_buff **skb)
	190	{
	191	pr_debug("gate=%d regidx=%d\n", gate, idx);
	192
	193	return nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_GET_PARAMETER,
	194	&idx, 1, skb);
	195	}
	196	EXPORT_SYMBOL(nfc_hci_get_param);
	197
	198	static int nfc_hci_open_pipe(struct nfc_hci_dev *hdev, u8 pipe)
	199	{
	200	struct sk_buff *skb;
	201	int r;
	202
	203	pr_debug("pipe=%d\n", pipe);
	204
	205	r = nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_OPEN_PIPE,
	206	NULL, 0, &skb);
	207	if (r == 0) {
	208	/* dest host other than host controller will send
	209	* number of pipes already open on this gate before
	210	* execution. The number can be found in skb->data[0]
	211	*/
	212	kfree_skb(skb);
	213	}
	214
	215	return r;
	216	}
	217
	218	static int nfc_hci_close_pipe(struct nfc_hci_dev *hdev, u8 pipe)
	219	{
220	pr_debug("\n");
221
222	return nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_CLOSE_PIPE,
223	NULL, 0, NULL);
224	}
225
226	static u8 nfc_hci_create_pipe(struct nfc_hci_dev *hdev, u8 dest_host,
227	u8 dest_gate, int *result)
228	{
229	struct sk_buff *skb;
230	struct hci_create_pipe_params params;
231	struct hci_create_pipe_resp *resp;
232	u8 pipe;
233
234	pr_debug("gate=%d\n", dest_gate);
235
236	params.src_gate = NFC_HCI_ADMIN_GATE;
237	params.dest_host = dest_host;
238	params.dest_gate = dest_gate;
239
240	*result = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
241	NFC_HCI_ADM_CREATE_PIPE,
242	(u8 *) &params, sizeof(params), &skb);
80e4232e SJ	243	if (*result < 0)
80e4232e SJ	244	return NFC_HCI_INVALID_PIPE;
8b8d2e08	245
80e4232e SJ	246	resp = (struct hci_create_pipe_resp *)skb->data;
	247	pipe = resp->pipe;
	248	kfree_skb(skb);
8b8d2e08	249
80e4232e SJ	250	pr_debug("pipe created=%d\n", pipe);
	251
	252	return pipe;
8b8d2e08 EL	253	}
	254
	255	static int nfc_hci_delete_pipe(struct nfc_hci_dev *hdev, u8 pipe)
	256	{
	257	pr_debug("\n");
	258
	259	return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
	260	NFC_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
	261	}
	262
	263	static int nfc_hci_clear_all_pipes(struct nfc_hci_dev *hdev)
	264	{
8b8d2e08	265	u8 param[2];
bf71ab8b	266	size_t param_len = 2;
8b8d2e08 EL	267
	268	/* TODO: Find out what the identity reference data is
	269	* and fill param with it. HCI spec 6.1.3.5 */
	270
	271	pr_debug("\n");
	272
bf71ab8b EL	273	if (test_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &hdev->quirks))
	274	param_len = 0;
	275
0250ffc5	276	return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
bf71ab8b EL	277	NFC_HCI_ADM_CLEAR_ALL_PIPE, param, param_len,
bf71ab8b EL	278	NULL);
8b8d2e08 EL	279	}
	280
	281	int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate)
	282	{
	283	int r;
	284	u8 pipe = hdev->gate2pipe[gate];
	285
	286	pr_debug("\n");
	287
	288	if (pipe == NFC_HCI_INVALID_PIPE)
	289	return -EADDRNOTAVAIL;
	290
	291	r = nfc_hci_close_pipe(hdev, pipe);
	292	if (r < 0)
	293	return r;
	294
	295	if (pipe != NFC_HCI_LINK_MGMT_PIPE && pipe != NFC_HCI_ADMIN_PIPE) {
	296	r = nfc_hci_delete_pipe(hdev, pipe);
	297	if (r < 0)
	298	return r;
	299	}
	300
	301	hdev->gate2pipe[gate] = NFC_HCI_INVALID_PIPE;
	302
	303	return 0;
	304	}
	305	EXPORT_SYMBOL(nfc_hci_disconnect_gate);
	306
	307	int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev)
	308	{
	309	int r;
	310
	311	pr_debug("\n");
	312
	313	r = nfc_hci_clear_all_pipes(hdev);
	314	if (r < 0)
	315	return r;
	316
118278f2	317	nfc_hci_reset_pipes(hdev);
8b8d2e08 EL	318
	319	return 0;
	320	}
	321	EXPORT_SYMBOL(nfc_hci_disconnect_all_gates);
	322
a10d595b EL	323	int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate,
a10d595b EL	324	u8 pipe)
8b8d2e08	325	{
8b8d2e08 EL	326	bool pipe_created = false;
	327	int r;
	328
	329	pr_debug("\n");
	330
118278f2	331	if (pipe == NFC_HCI_DO_NOT_CREATE_PIPE)
b3a55b9c CR	332	return 0;
b3a55b9c CR	333
8b8d2e08 EL	334	if (hdev->gate2pipe[dest_gate] != NFC_HCI_INVALID_PIPE)
	335	return -EADDRINUSE;
	336
a10d595b	337	if (pipe != NFC_HCI_INVALID_PIPE)
07887e92	338	goto open_pipe;
a10d595b	339
8b8d2e08 EL	340	switch (dest_gate) {
	341	case NFC_HCI_LINK_MGMT_GATE:
	342	pipe = NFC_HCI_LINK_MGMT_PIPE;
	343	break;
	344	case NFC_HCI_ADMIN_GATE:
	345	pipe = NFC_HCI_ADMIN_PIPE;
	346	break;
	347	default:
	348	pipe = nfc_hci_create_pipe(hdev, dest_host, dest_gate, &r);
	349	if (pipe == NFC_HCI_INVALID_PIPE)
	350	return r;
	351	pipe_created = true;
	352	break;
	353	}
	354
07887e92	355	open_pipe:
8b8d2e08 EL	356	r = nfc_hci_open_pipe(hdev, pipe);
	357	if (r < 0) {
	358	if (pipe_created)
	359	if (nfc_hci_delete_pipe(hdev, pipe) < 0) {
	360	/* TODO: Cannot clean by deleting pipe...
	361	* -> inconsistent state */
	362	}
	363	return r;
	364	}
	365
118278f2 CR	366	hdev->pipes[pipe].gate = dest_gate;
118278f2 CR	367	hdev->pipes[pipe].dest_host = dest_host;
8b8d2e08 EL	368	hdev->gate2pipe[dest_gate] = pipe;
	369
	370	return 0;
	371	}
	372	EXPORT_SYMBOL(nfc_hci_connect_gate);