1/*
2 *  The NFC Controller Interface is the communication protocol between an
3 *  NFC Controller (NFCC) and a Device Host (DH).
4 *
5 *  Copyright (C) 2011 Texas Instruments, Inc.
6 *
7 *  Written by Ilan Elias <ilane@ti.com>
8 *
9 *  Acknowledgements:
10 *  This file is based on hci_event.c, which was written
11 *  by Maxim Krasnyansky.
12 *
13 *  This program is free software; you can redistribute it and/or modify
14 *  it under the terms of the GNU General Public License version 2
15 *  as published by the Free Software Foundation
16 *
17 *  This program is distributed in the hope that it will be useful,
18 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
19 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20 *  GNU General Public License for more details.
21 *
22 *  You should have received a copy of the GNU General Public License
23 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
24 *
25 */
26
27#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
28
29#include <linux/types.h>
30#include <linux/interrupt.h>
31#include <linux/bitops.h>
32#include <linux/skbuff.h>
33
34#include "../nfc.h"
35#include <net/nfc/nci.h>
36#include <net/nfc/nci_core.h>
37
38/* Handle NCI Response packets */
39
40static void nci_core_reset_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
41{
42	struct nci_core_reset_rsp *rsp = (void *) skb->data;
43
44	pr_debug("status 0x%x\n", rsp->status);
45
46	if (rsp->status == NCI_STATUS_OK) {
47		ndev->nci_ver = rsp->nci_ver;
48		pr_debug("nci_ver 0x%x, config_status 0x%x\n",
49			 rsp->nci_ver, rsp->config_status);
50	}
51
52	nci_req_complete(ndev, rsp->status);
53}
54
55static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
56{
57	struct nci_core_init_rsp_1 *rsp_1 = (void *) skb->data;
58	struct nci_core_init_rsp_2 *rsp_2;
59
60	pr_debug("status 0x%x\n", rsp_1->status);
61
62	if (rsp_1->status != NCI_STATUS_OK)
63		goto exit;
64
65	ndev->nfcc_features = __le32_to_cpu(rsp_1->nfcc_features);
66	ndev->num_supported_rf_interfaces = rsp_1->num_supported_rf_interfaces;
67
68	if (ndev->num_supported_rf_interfaces >
69	    NCI_MAX_SUPPORTED_RF_INTERFACES) {
70		ndev->num_supported_rf_interfaces =
71			NCI_MAX_SUPPORTED_RF_INTERFACES;
72	}
73
74	memcpy(ndev->supported_rf_interfaces,
75	       rsp_1->supported_rf_interfaces,
76	       ndev->num_supported_rf_interfaces);
77
78	rsp_2 = (void *) (skb->data + 6 + rsp_1->num_supported_rf_interfaces);
79
80	ndev->max_logical_connections = rsp_2->max_logical_connections;
81	ndev->max_routing_table_size =
82		__le16_to_cpu(rsp_2->max_routing_table_size);
83	ndev->max_ctrl_pkt_payload_len =
84		rsp_2->max_ctrl_pkt_payload_len;
85	ndev->max_size_for_large_params =
86		__le16_to_cpu(rsp_2->max_size_for_large_params);
87	ndev->manufact_id =
88		rsp_2->manufact_id;
89	ndev->manufact_specific_info =
90		__le32_to_cpu(rsp_2->manufact_specific_info);
91
92	pr_debug("nfcc_features 0x%x\n",
93		 ndev->nfcc_features);
94	pr_debug("num_supported_rf_interfaces %d\n",
95		 ndev->num_supported_rf_interfaces);
96	pr_debug("supported_rf_interfaces[0] 0x%x\n",
97		 ndev->supported_rf_interfaces[0]);
98	pr_debug("supported_rf_interfaces[1] 0x%x\n",
99		 ndev->supported_rf_interfaces[1]);
100	pr_debug("supported_rf_interfaces[2] 0x%x\n",
101		 ndev->supported_rf_interfaces[2]);
102	pr_debug("supported_rf_interfaces[3] 0x%x\n",
103		 ndev->supported_rf_interfaces[3]);
104	pr_debug("max_logical_connections %d\n",
105		 ndev->max_logical_connections);
106	pr_debug("max_routing_table_size %d\n",
107		 ndev->max_routing_table_size);
108	pr_debug("max_ctrl_pkt_payload_len %d\n",
109		 ndev->max_ctrl_pkt_payload_len);
110	pr_debug("max_size_for_large_params %d\n",
111		 ndev->max_size_for_large_params);
112	pr_debug("manufact_id 0x%x\n",
113		 ndev->manufact_id);
114	pr_debug("manufact_specific_info 0x%x\n",
115		 ndev->manufact_specific_info);
116
117exit:
118	nci_req_complete(ndev, rsp_1->status);
119}
120
121static void nci_core_set_config_rsp_packet(struct nci_dev *ndev,
122					   struct sk_buff *skb)
123{
124	struct nci_core_set_config_rsp *rsp = (void *) skb->data;
125
126	pr_debug("status 0x%x\n", rsp->status);
127
128	nci_req_complete(ndev, rsp->status);
129}
130
131static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev,
132				       struct sk_buff *skb)
133{
134	__u8 status = skb->data[0];
135
136	pr_debug("status 0x%x\n", status);
137
138	nci_req_complete(ndev, status);
139}
140
141static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
142{
143	__u8 status = skb->data[0];
144
145	pr_debug("status 0x%x\n", status);
146
147	if (status == NCI_STATUS_OK)
148		atomic_set(&ndev->state, NCI_DISCOVERY);
149
150	nci_req_complete(ndev, status);
151}
152
153static void nci_rf_disc_select_rsp_packet(struct nci_dev *ndev,
154					  struct sk_buff *skb)
155{
156	__u8 status = skb->data[0];
157
158	pr_debug("status 0x%x\n", status);
159
160	/* Complete the request on intf_activated_ntf or generic_error_ntf */
161	if (status != NCI_STATUS_OK)
162		nci_req_complete(ndev, status);
163}
164
165static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev,
166					 struct sk_buff *skb)
167{
168	__u8 status = skb->data[0];
169
170	pr_debug("status 0x%x\n", status);
171
172	/* If target was active, complete the request only in deactivate_ntf */
173	if ((status != NCI_STATUS_OK) ||
174	    (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
175		nci_clear_target_list(ndev);
176		atomic_set(&ndev->state, NCI_IDLE);
177		nci_req_complete(ndev, status);
178	}
179}
180
181void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
182{
183	__u16 rsp_opcode = nci_opcode(skb->data);
184
185	/* we got a rsp, stop the cmd timer */
186	del_timer(&ndev->cmd_timer);
187
188	pr_debug("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
189		 nci_pbf(skb->data),
190		 nci_opcode_gid(rsp_opcode),
191		 nci_opcode_oid(rsp_opcode),
192		 nci_plen(skb->data));
193
194	/* strip the nci control header */
195	skb_pull(skb, NCI_CTRL_HDR_SIZE);
196
197	switch (rsp_opcode) {
198	case NCI_OP_CORE_RESET_RSP:
199		nci_core_reset_rsp_packet(ndev, skb);
200		break;
201
202	case NCI_OP_CORE_INIT_RSP:
203		nci_core_init_rsp_packet(ndev, skb);
204		break;
205
206	case NCI_OP_CORE_SET_CONFIG_RSP:
207		nci_core_set_config_rsp_packet(ndev, skb);
208		break;
209
210	case NCI_OP_RF_DISCOVER_MAP_RSP:
211		nci_rf_disc_map_rsp_packet(ndev, skb);
212		break;
213
214	case NCI_OP_RF_DISCOVER_RSP:
215		nci_rf_disc_rsp_packet(ndev, skb);
216		break;
217
218	case NCI_OP_RF_DISCOVER_SELECT_RSP:
219		nci_rf_disc_select_rsp_packet(ndev, skb);
220		break;
221
222	case NCI_OP_RF_DEACTIVATE_RSP:
223		nci_rf_deactivate_rsp_packet(ndev, skb);
224		break;
225
226	default:
227		pr_err("unknown rsp opcode 0x%x\n", rsp_opcode);
228		break;
229	}
230
231	kfree_skb(skb);
232
233	/* trigger the next cmd */
234	atomic_set(&ndev->cmd_cnt, 1);
235	if (!skb_queue_empty(&ndev->cmd_q))
236		queue_work(ndev->cmd_wq, &ndev->cmd_work);
237}
238