[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);

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 *) &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;

	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_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->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
	119	int nfc_hci_send_response(struct nfc_hci_dev *hdev, u8 gate, u8 response,
	120	const u8 *param, size_t param_len)
	121	{
	122	u8 pipe;
	123
	124	pr_debug("\n");
	125
	126	pipe = hdev->gate2pipe[gate];
	127	if (pipe == NFC_HCI_INVALID_PIPE)
	128	return -EADDRNOTAVAIL;
	129
	130	return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
	131	response, param, param_len, NULL, NULL,
	132	0);
	133	}
	134	EXPORT_SYMBOL(nfc_hci_send_response);
	135
	136	/*
	137	* Execute an hci command sent to gate.
	138	* skb will contain response data if success. skb can be NULL if you are not
	139	* interested by the response.
	140	*/
	141	int nfc_hci_send_cmd(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
	142	const u8 param, size_t param_len, struct sk_buff *skb)
	143	{
	144	u8 pipe;
	145
	146	pr_debug("\n");
	147
	148	pipe = hdev->gate2pipe[gate];
	149	if (pipe == NFC_HCI_INVALID_PIPE)
	150	return -EADDRNOTAVAIL;
	151
152	return nfc_hci_execute_cmd(hdev, pipe, cmd, param, param_len, skb);
153	}
154	EXPORT_SYMBOL(nfc_hci_send_cmd);
155
e4c4789e EL	156	int nfc_hci_send_cmd_async(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
	157	const u8 *param, size_t param_len,
	158	data_exchange_cb_t cb, void *cb_context)
	159	{
	160	u8 pipe;
	161
	162	pr_debug("\n");
	163
	164	pipe = hdev->gate2pipe[gate];
	165	if (pipe == NFC_HCI_INVALID_PIPE)
	166	return -EADDRNOTAVAIL;
	167
	168	return nfc_hci_execute_cmd_async(hdev, pipe, cmd, param, param_len,
	169	cb, cb_context);
	170	}
	171	EXPORT_SYMBOL(nfc_hci_send_cmd_async);
	172
8b8d2e08 EL	173	int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
	174	const u8 *param, size_t param_len)
	175	{
	176	int r;
	177	u8 *tmp;
	178
	179	/* TODO ELa: reg idx must be inserted before param, but we don't want
	180	* to ask the caller to do it to keep a simpler API.
	181	* For now, just create a new temporary param buffer. This is far from
	182	* optimal though, and the plan is to modify APIs to pass idx down to
	183	* nfc_hci_hcp_message_tx where the frame is actually built, thereby
	184	* eliminating the need for the temp allocation-copy here.
	185	*/
	186
	187	pr_debug("idx=%d to gate %d\n", idx, gate);
	188
	189	tmp = kmalloc(1 + param_len, GFP_KERNEL);
	190	if (tmp == NULL)
	191	return -ENOMEM;
	192
	193	*tmp = idx;
	194	memcpy(tmp + 1, param, param_len);
	195
	196	r = nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_SET_PARAMETER,
	197	tmp, param_len + 1, NULL);
	198
	199	kfree(tmp);
	200
	201	return r;
	202	}
	203	EXPORT_SYMBOL(nfc_hci_set_param);
	204
	205	int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
	206	struct sk_buff **skb)
	207	{
	208	pr_debug("gate=%d regidx=%d\n", gate, idx);
	209
	210	return nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_GET_PARAMETER,
	211	&idx, 1, skb);
	212	}
	213	EXPORT_SYMBOL(nfc_hci_get_param);
	214
	215	static int nfc_hci_open_pipe(struct nfc_hci_dev *hdev, u8 pipe)
	216	{
	217	struct sk_buff *skb;
	218	int r;
	219
	220	pr_debug("pipe=%d\n", pipe);
	221
	222	r = nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_OPEN_PIPE,
	223	NULL, 0, &skb);
	224	if (r == 0) {
	225	/* dest host other than host controller will send
	226	* number of pipes already open on this gate before
	227	* execution. The number can be found in skb->data[0]
	228	*/
	229	kfree_skb(skb);
	230	}
	231
	232	return r;
	233	}
	234
	235	static int nfc_hci_close_pipe(struct nfc_hci_dev *hdev, u8 pipe)
	236	{
237	pr_debug("\n");
238
239	return nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_CLOSE_PIPE,
240	NULL, 0, NULL);
241	}
242
243	static u8 nfc_hci_create_pipe(struct nfc_hci_dev *hdev, u8 dest_host,
244	u8 dest_gate, int *result)
245	{
246	struct sk_buff *skb;
247	struct hci_create_pipe_params params;
248	struct hci_create_pipe_resp *resp;
249	u8 pipe;
250
251	pr_debug("gate=%d\n", dest_gate);
252
253	params.src_gate = NFC_HCI_ADMIN_GATE;
254	params.dest_host = dest_host;
255	params.dest_gate = dest_gate;
256
257	*result = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
258	NFC_HCI_ADM_CREATE_PIPE,
259	(u8 *) &params, sizeof(params), &skb);
80e4232e SJ	260	if (*result < 0)
80e4232e SJ	261	return NFC_HCI_INVALID_PIPE;
8b8d2e08	262
80e4232e SJ	263	resp = (struct hci_create_pipe_resp *)skb->data;
	264	pipe = resp->pipe;
	265	kfree_skb(skb);
8b8d2e08	266
80e4232e SJ	267	pr_debug("pipe created=%d\n", pipe);
	268
	269	return pipe;
8b8d2e08 EL	270	}
	271
	272	static int nfc_hci_delete_pipe(struct nfc_hci_dev *hdev, u8 pipe)
	273	{
	274	pr_debug("\n");
	275
	276	return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
	277	NFC_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
	278	}
	279
	280	static int nfc_hci_clear_all_pipes(struct nfc_hci_dev *hdev)
	281	{
8b8d2e08	282	u8 param[2];
bf71ab8b	283	size_t param_len = 2;
8b8d2e08 EL	284
	285	/* TODO: Find out what the identity reference data is
	286	* and fill param with it. HCI spec 6.1.3.5 */
	287
	288	pr_debug("\n");
	289
bf71ab8b EL	290	if (test_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &hdev->quirks))
	291	param_len = 0;
	292
0250ffc5	293	return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
bf71ab8b EL	294	NFC_HCI_ADM_CLEAR_ALL_PIPE, param, param_len,
bf71ab8b EL	295	NULL);
8b8d2e08 EL	296	}
	297
	298	int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate)
	299	{
	300	int r;
	301	u8 pipe = hdev->gate2pipe[gate];
	302
	303	pr_debug("\n");
	304
	305	if (pipe == NFC_HCI_INVALID_PIPE)
	306	return -EADDRNOTAVAIL;
	307
	308	r = nfc_hci_close_pipe(hdev, pipe);
	309	if (r < 0)
	310	return r;
	311
	312	if (pipe != NFC_HCI_LINK_MGMT_PIPE && pipe != NFC_HCI_ADMIN_PIPE) {
	313	r = nfc_hci_delete_pipe(hdev, pipe);
	314	if (r < 0)
	315	return r;
	316	}
	317
	318	hdev->gate2pipe[gate] = NFC_HCI_INVALID_PIPE;
	319
	320	return 0;
	321	}
	322	EXPORT_SYMBOL(nfc_hci_disconnect_gate);
	323
	324	int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev)
	325	{
	326	int r;
	327
	328	pr_debug("\n");
	329
	330	r = nfc_hci_clear_all_pipes(hdev);
	331	if (r < 0)
	332	return r;
	333
	334	memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
	335
	336	return 0;
	337	}
	338	EXPORT_SYMBOL(nfc_hci_disconnect_all_gates);
	339
a10d595b EL	340	int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate,
a10d595b EL	341	u8 pipe)
8b8d2e08	342	{
8b8d2e08 EL	343	bool pipe_created = false;
	344	int r;
	345
	346	pr_debug("\n");
	347
b3a55b9c CR	348	if (hdev->gate2pipe[dest_gate] == NFC_HCI_DO_NOT_CREATE_PIPE)
	349	return 0;
	350
8b8d2e08 EL	351	if (hdev->gate2pipe[dest_gate] != NFC_HCI_INVALID_PIPE)
	352	return -EADDRINUSE;
	353
a10d595b	354	if (pipe != NFC_HCI_INVALID_PIPE)
07887e92	355	goto open_pipe;
a10d595b	356
8b8d2e08 EL	357	switch (dest_gate) {
	358	case NFC_HCI_LINK_MGMT_GATE:
	359	pipe = NFC_HCI_LINK_MGMT_PIPE;
	360	break;
	361	case NFC_HCI_ADMIN_GATE:
	362	pipe = NFC_HCI_ADMIN_PIPE;
	363	break;
	364	default:
	365	pipe = nfc_hci_create_pipe(hdev, dest_host, dest_gate, &r);
	366	if (pipe == NFC_HCI_INVALID_PIPE)
	367	return r;
	368	pipe_created = true;
	369	break;
	370	}
	371
07887e92	372	open_pipe:
8b8d2e08 EL	373	r = nfc_hci_open_pipe(hdev, pipe);
	374	if (r < 0) {
	375	if (pipe_created)
	376	if (nfc_hci_delete_pipe(hdev, pipe) < 0) {
	377	/* TODO: Cannot clean by deleting pipe...
	378	* -> inconsistent state */
	379	}
	380	return r;
	381	}
	382
	383	hdev->gate2pipe[dest_gate] = pipe;
	384
	385	return 0;
	386	}
	387	EXPORT_SYMBOL(nfc_hci_connect_gate);