Merge branch 'x86-uv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[pandora-kernel.git] / net / nfc / nci / rsp.c
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, write to the Free Software
24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
25  *
26  */
27
28 #include <linux/types.h>
29 #include <linux/interrupt.h>
30 #include <linux/bitops.h>
31 #include <linux/skbuff.h>
32
33 #include "../nfc.h"
34 #include <net/nfc/nci.h>
35 #include <net/nfc/nci_core.h>
36
37 /* Handle NCI Response packets */
38
39 static void nci_core_reset_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
40 {
41         struct nci_core_reset_rsp *rsp = (void *) skb->data;
42
43         nfc_dbg("entry, status 0x%x", rsp->status);
44
45         if (rsp->status == NCI_STATUS_OK)
46                 ndev->nci_ver = rsp->nci_ver;
47
48         nfc_dbg("nci_ver 0x%x", ndev->nci_ver);
49
50         nci_req_complete(ndev, rsp->status);
51 }
52
53 static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
54 {
55         struct nci_core_init_rsp_1 *rsp_1 = (void *) skb->data;
56         struct nci_core_init_rsp_2 *rsp_2;
57
58         nfc_dbg("entry, status 0x%x", rsp_1->status);
59
60         if (rsp_1->status != NCI_STATUS_OK)
61                 return;
62
63         ndev->nfcc_features = __le32_to_cpu(rsp_1->nfcc_features);
64         ndev->num_supported_rf_interfaces = rsp_1->num_supported_rf_interfaces;
65
66         if (ndev->num_supported_rf_interfaces >
67                 NCI_MAX_SUPPORTED_RF_INTERFACES) {
68                 ndev->num_supported_rf_interfaces =
69                         NCI_MAX_SUPPORTED_RF_INTERFACES;
70         }
71
72         memcpy(ndev->supported_rf_interfaces,
73                 rsp_1->supported_rf_interfaces,
74                 ndev->num_supported_rf_interfaces);
75
76         rsp_2 = (void *) (skb->data + 6 + ndev->num_supported_rf_interfaces);
77
78         ndev->max_logical_connections =
79                 rsp_2->max_logical_connections;
80         ndev->max_routing_table_size =
81                 __le16_to_cpu(rsp_2->max_routing_table_size);
82         ndev->max_control_packet_payload_length =
83                 rsp_2->max_control_packet_payload_length;
84         ndev->rf_sending_buffer_size =
85                 __le16_to_cpu(rsp_2->rf_sending_buffer_size);
86         ndev->rf_receiving_buffer_size =
87                 __le16_to_cpu(rsp_2->rf_receiving_buffer_size);
88         ndev->manufacturer_id =
89                 __le16_to_cpu(rsp_2->manufacturer_id);
90
91         nfc_dbg("nfcc_features 0x%x",
92                 ndev->nfcc_features);
93         nfc_dbg("num_supported_rf_interfaces %d",
94                 ndev->num_supported_rf_interfaces);
95         nfc_dbg("supported_rf_interfaces[0] 0x%x",
96                 ndev->supported_rf_interfaces[0]);
97         nfc_dbg("supported_rf_interfaces[1] 0x%x",
98                 ndev->supported_rf_interfaces[1]);
99         nfc_dbg("supported_rf_interfaces[2] 0x%x",
100                 ndev->supported_rf_interfaces[2]);
101         nfc_dbg("supported_rf_interfaces[3] 0x%x",
102                 ndev->supported_rf_interfaces[3]);
103         nfc_dbg("max_logical_connections %d",
104                 ndev->max_logical_connections);
105         nfc_dbg("max_routing_table_size %d",
106                 ndev->max_routing_table_size);
107         nfc_dbg("max_control_packet_payload_length %d",
108                 ndev->max_control_packet_payload_length);
109         nfc_dbg("rf_sending_buffer_size %d",
110                 ndev->rf_sending_buffer_size);
111         nfc_dbg("rf_receiving_buffer_size %d",
112                 ndev->rf_receiving_buffer_size);
113         nfc_dbg("manufacturer_id 0x%x",
114                 ndev->manufacturer_id);
115
116         nci_req_complete(ndev, rsp_1->status);
117 }
118
119 static void nci_core_conn_create_rsp_packet(struct nci_dev *ndev,
120                                                 struct sk_buff *skb)
121 {
122         struct nci_core_conn_create_rsp *rsp = (void *) skb->data;
123
124         nfc_dbg("entry, status 0x%x", rsp->status);
125
126         if (rsp->status != NCI_STATUS_OK)
127                 return;
128
129         ndev->max_pkt_payload_size = rsp->max_pkt_payload_size;
130         ndev->initial_num_credits = rsp->initial_num_credits;
131         ndev->conn_id = rsp->conn_id;
132
133         atomic_set(&ndev->credits_cnt, ndev->initial_num_credits);
134
135         nfc_dbg("max_pkt_payload_size %d", ndev->max_pkt_payload_size);
136         nfc_dbg("initial_num_credits %d", ndev->initial_num_credits);
137         nfc_dbg("conn_id %d", ndev->conn_id);
138 }
139
140 static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev,
141                                         struct sk_buff *skb)
142 {
143         __u8 status = skb->data[0];
144
145         nfc_dbg("entry, status 0x%x", status);
146
147         nci_req_complete(ndev, status);
148 }
149
150 static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
151 {
152         __u8 status = skb->data[0];
153
154         nfc_dbg("entry, status 0x%x", status);
155
156         if (status == NCI_STATUS_OK)
157                 set_bit(NCI_DISCOVERY, &ndev->flags);
158
159         nci_req_complete(ndev, status);
160 }
161
162 static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev,
163                                         struct sk_buff *skb)
164 {
165         __u8 status = skb->data[0];
166
167         nfc_dbg("entry, status 0x%x", status);
168
169         clear_bit(NCI_DISCOVERY, &ndev->flags);
170
171         nci_req_complete(ndev, status);
172 }
173
174 void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
175 {
176         __u16 rsp_opcode = nci_opcode(skb->data);
177
178         /* we got a rsp, stop the cmd timer */
179         del_timer(&ndev->cmd_timer);
180
181         nfc_dbg("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d",
182                         nci_pbf(skb->data),
183                         nci_opcode_gid(rsp_opcode),
184                         nci_opcode_oid(rsp_opcode),
185                         nci_plen(skb->data));
186
187         /* strip the nci control header */
188         skb_pull(skb, NCI_CTRL_HDR_SIZE);
189
190         switch (rsp_opcode) {
191         case NCI_OP_CORE_RESET_RSP:
192                 nci_core_reset_rsp_packet(ndev, skb);
193                 break;
194
195         case NCI_OP_CORE_INIT_RSP:
196                 nci_core_init_rsp_packet(ndev, skb);
197                 break;
198
199         case NCI_OP_CORE_CONN_CREATE_RSP:
200                 nci_core_conn_create_rsp_packet(ndev, skb);
201                 break;
202
203         case NCI_OP_RF_DISCOVER_MAP_RSP:
204                 nci_rf_disc_map_rsp_packet(ndev, skb);
205                 break;
206
207         case NCI_OP_RF_DISCOVER_RSP:
208                 nci_rf_disc_rsp_packet(ndev, skb);
209                 break;
210
211         case NCI_OP_RF_DEACTIVATE_RSP:
212                 nci_rf_deactivate_rsp_packet(ndev, skb);
213                 break;
214
215         default:
216                 nfc_err("unknown rsp opcode 0x%x", rsp_opcode);
217                 break;
218         }
219
220         kfree_skb(skb);
221
222         /* trigger the next cmd */
223         atomic_set(&ndev->cmd_cnt, 1);
224         if (!skb_queue_empty(&ndev->cmd_q))
225                 queue_work(ndev->cmd_wq, &ndev->cmd_work);
226 }