Andrei Emeltchenko | 466f800 | 2012-05-29 13:59:01 +0300 | [diff] [blame] | 1 | /* |
| 2 | Copyright (c) 2010,2011 Code Aurora Forum. All rights reserved. |
| 3 | Copyright (c) 2011,2012 Intel Corp. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License version 2 and |
| 7 | only version 2 as published by the Free Software Foundation. |
| 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 | |
| 15 | #include <net/bluetooth/bluetooth.h> |
| 16 | #include <net/bluetooth/hci_core.h> |
| 17 | #include <net/bluetooth/l2cap.h> |
Andrei Emeltchenko | 9740e49 | 2012-05-29 13:59:02 +0300 | [diff] [blame] | 18 | #include <net/bluetooth/a2mp.h> |
Andrei Emeltchenko | 466f800 | 2012-05-29 13:59:01 +0300 | [diff] [blame] | 19 | |
Andrei Emeltchenko | f97268f | 2012-09-27 17:26:07 +0300 | [diff] [blame] | 20 | /* Global AMP Manager list */ |
| 21 | LIST_HEAD(amp_mgr_list); |
| 22 | DEFINE_MUTEX(amp_mgr_list_lock); |
| 23 | |
Andrei Emeltchenko | f6d3c6e | 2012-05-29 13:59:03 +0300 | [diff] [blame] | 24 | /* A2MP build & send command helper functions */ |
| 25 | static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data) |
| 26 | { |
| 27 | struct a2mp_cmd *cmd; |
| 28 | int plen; |
| 29 | |
| 30 | plen = sizeof(*cmd) + len; |
| 31 | cmd = kzalloc(plen, GFP_KERNEL); |
| 32 | if (!cmd) |
| 33 | return NULL; |
| 34 | |
| 35 | cmd->code = code; |
| 36 | cmd->ident = ident; |
| 37 | cmd->len = cpu_to_le16(len); |
| 38 | |
| 39 | memcpy(cmd->data, data, len); |
| 40 | |
| 41 | return cmd; |
| 42 | } |
| 43 | |
Andrei Emeltchenko | 8e2a0d9 | 2012-09-27 17:26:08 +0300 | [diff] [blame^] | 44 | void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len, void *data) |
Andrei Emeltchenko | f6d3c6e | 2012-05-29 13:59:03 +0300 | [diff] [blame] | 45 | { |
| 46 | struct l2cap_chan *chan = mgr->a2mp_chan; |
| 47 | struct a2mp_cmd *cmd; |
| 48 | u16 total_len = len + sizeof(*cmd); |
| 49 | struct kvec iv; |
| 50 | struct msghdr msg; |
| 51 | |
| 52 | cmd = __a2mp_build(code, ident, len, data); |
| 53 | if (!cmd) |
| 54 | return; |
| 55 | |
| 56 | iv.iov_base = cmd; |
| 57 | iv.iov_len = total_len; |
| 58 | |
| 59 | memset(&msg, 0, sizeof(msg)); |
| 60 | |
| 61 | msg.msg_iov = (struct iovec *) &iv; |
| 62 | msg.msg_iovlen = 1; |
| 63 | |
| 64 | l2cap_chan_send(chan, &msg, total_len, 0); |
| 65 | |
| 66 | kfree(cmd); |
| 67 | } |
| 68 | |
Andrei Emeltchenko | 8598d06 | 2012-05-29 13:59:09 +0300 | [diff] [blame] | 69 | static inline void __a2mp_cl_bredr(struct a2mp_cl *cl) |
| 70 | { |
| 71 | cl->id = 0; |
| 72 | cl->type = 0; |
| 73 | cl->status = 1; |
| 74 | } |
| 75 | |
| 76 | /* hci_dev_list shall be locked */ |
| 77 | static void __a2mp_add_cl(struct amp_mgr *mgr, struct a2mp_cl *cl, u8 num_ctrl) |
| 78 | { |
| 79 | int i = 0; |
| 80 | struct hci_dev *hdev; |
| 81 | |
| 82 | __a2mp_cl_bredr(cl); |
| 83 | |
| 84 | list_for_each_entry(hdev, &hci_dev_list, list) { |
| 85 | /* Iterate through AMP controllers */ |
| 86 | if (hdev->id == HCI_BREDR_ID) |
| 87 | continue; |
| 88 | |
| 89 | /* Starting from second entry */ |
| 90 | if (++i >= num_ctrl) |
| 91 | return; |
| 92 | |
| 93 | cl[i].id = hdev->id; |
| 94 | cl[i].type = hdev->amp_type; |
| 95 | cl[i].status = hdev->amp_status; |
| 96 | } |
| 97 | } |
| 98 | |
Andrei Emeltchenko | 21dbd2c | 2012-05-29 13:59:08 +0300 | [diff] [blame] | 99 | /* Processing A2MP messages */ |
| 100 | static int a2mp_command_rej(struct amp_mgr *mgr, struct sk_buff *skb, |
| 101 | struct a2mp_cmd *hdr) |
| 102 | { |
| 103 | struct a2mp_cmd_rej *rej = (void *) skb->data; |
| 104 | |
| 105 | if (le16_to_cpu(hdr->len) < sizeof(*rej)) |
| 106 | return -EINVAL; |
| 107 | |
| 108 | BT_DBG("ident %d reason %d", hdr->ident, le16_to_cpu(rej->reason)); |
| 109 | |
| 110 | skb_pull(skb, sizeof(*rej)); |
| 111 | |
| 112 | return 0; |
| 113 | } |
| 114 | |
Andrei Emeltchenko | 8598d06 | 2012-05-29 13:59:09 +0300 | [diff] [blame] | 115 | static int a2mp_discover_req(struct amp_mgr *mgr, struct sk_buff *skb, |
| 116 | struct a2mp_cmd *hdr) |
| 117 | { |
| 118 | struct a2mp_discov_req *req = (void *) skb->data; |
| 119 | u16 len = le16_to_cpu(hdr->len); |
| 120 | struct a2mp_discov_rsp *rsp; |
| 121 | u16 ext_feat; |
| 122 | u8 num_ctrl; |
| 123 | |
| 124 | if (len < sizeof(*req)) |
| 125 | return -EINVAL; |
| 126 | |
| 127 | skb_pull(skb, sizeof(*req)); |
| 128 | |
| 129 | ext_feat = le16_to_cpu(req->ext_feat); |
| 130 | |
| 131 | BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(req->mtu), ext_feat); |
| 132 | |
| 133 | /* check that packet is not broken for now */ |
| 134 | while (ext_feat & A2MP_FEAT_EXT) { |
| 135 | if (len < sizeof(ext_feat)) |
| 136 | return -EINVAL; |
| 137 | |
| 138 | ext_feat = get_unaligned_le16(skb->data); |
| 139 | BT_DBG("efm 0x%4.4x", ext_feat); |
| 140 | len -= sizeof(ext_feat); |
| 141 | skb_pull(skb, sizeof(ext_feat)); |
| 142 | } |
| 143 | |
| 144 | read_lock(&hci_dev_list_lock); |
| 145 | |
| 146 | num_ctrl = __hci_num_ctrl(); |
| 147 | len = num_ctrl * sizeof(struct a2mp_cl) + sizeof(*rsp); |
| 148 | rsp = kmalloc(len, GFP_ATOMIC); |
| 149 | if (!rsp) { |
| 150 | read_unlock(&hci_dev_list_lock); |
| 151 | return -ENOMEM; |
| 152 | } |
| 153 | |
| 154 | rsp->mtu = __constant_cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU); |
| 155 | rsp->ext_feat = 0; |
| 156 | |
| 157 | __a2mp_add_cl(mgr, rsp->cl, num_ctrl); |
| 158 | |
| 159 | read_unlock(&hci_dev_list_lock); |
| 160 | |
| 161 | a2mp_send(mgr, A2MP_DISCOVER_RSP, hdr->ident, len, rsp); |
| 162 | |
| 163 | kfree(rsp); |
| 164 | return 0; |
| 165 | } |
| 166 | |
Andrei Emeltchenko | 329d81af | 2012-05-29 13:59:10 +0300 | [diff] [blame] | 167 | static int a2mp_change_notify(struct amp_mgr *mgr, struct sk_buff *skb, |
| 168 | struct a2mp_cmd *hdr) |
| 169 | { |
| 170 | struct a2mp_cl *cl = (void *) skb->data; |
| 171 | |
| 172 | while (skb->len >= sizeof(*cl)) { |
| 173 | BT_DBG("Controller id %d type %d status %d", cl->id, cl->type, |
| 174 | cl->status); |
| 175 | cl = (struct a2mp_cl *) skb_pull(skb, sizeof(*cl)); |
| 176 | } |
| 177 | |
| 178 | /* TODO send A2MP_CHANGE_RSP */ |
| 179 | |
| 180 | return 0; |
| 181 | } |
| 182 | |
Andrei Emeltchenko | 47f2d97 | 2012-05-29 13:59:11 +0300 | [diff] [blame] | 183 | static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb, |
| 184 | struct a2mp_cmd *hdr) |
| 185 | { |
| 186 | struct a2mp_info_req *req = (void *) skb->data; |
Andrei Emeltchenko | 47f2d97 | 2012-05-29 13:59:11 +0300 | [diff] [blame] | 187 | struct hci_dev *hdev; |
| 188 | |
| 189 | if (le16_to_cpu(hdr->len) < sizeof(*req)) |
| 190 | return -EINVAL; |
| 191 | |
| 192 | BT_DBG("id %d", req->id); |
| 193 | |
Andrei Emeltchenko | 47f2d97 | 2012-05-29 13:59:11 +0300 | [diff] [blame] | 194 | hdev = hci_dev_get(req->id); |
Andrei Emeltchenko | 8e2a0d9 | 2012-09-27 17:26:08 +0300 | [diff] [blame^] | 195 | if (!hdev) { |
| 196 | struct a2mp_info_rsp rsp; |
| 197 | |
| 198 | rsp.id = req->id; |
| 199 | rsp.status = A2MP_STATUS_INVALID_CTRL_ID; |
| 200 | |
| 201 | a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp), |
| 202 | &rsp); |
Andrei Emeltchenko | 47f2d97 | 2012-05-29 13:59:11 +0300 | [diff] [blame] | 203 | } |
| 204 | |
Andrei Emeltchenko | 8e2a0d9 | 2012-09-27 17:26:08 +0300 | [diff] [blame^] | 205 | if (hdev->dev_type != HCI_BREDR) { |
| 206 | mgr->state = READ_LOC_AMP_INFO; |
| 207 | hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL); |
| 208 | } |
Andrei Emeltchenko | 47f2d97 | 2012-05-29 13:59:11 +0300 | [diff] [blame] | 209 | |
Andrei Emeltchenko | 8e2a0d9 | 2012-09-27 17:26:08 +0300 | [diff] [blame^] | 210 | hci_dev_put(hdev); |
Andrei Emeltchenko | 47f2d97 | 2012-05-29 13:59:11 +0300 | [diff] [blame] | 211 | |
| 212 | skb_pull(skb, sizeof(*req)); |
| 213 | return 0; |
| 214 | } |
| 215 | |
Andrei Emeltchenko | a28381dc | 2012-05-29 13:59:12 +0300 | [diff] [blame] | 216 | static int a2mp_getampassoc_req(struct amp_mgr *mgr, struct sk_buff *skb, |
| 217 | struct a2mp_cmd *hdr) |
| 218 | { |
| 219 | struct a2mp_amp_assoc_req *req = (void *) skb->data; |
| 220 | struct hci_dev *hdev; |
| 221 | |
| 222 | if (le16_to_cpu(hdr->len) < sizeof(*req)) |
| 223 | return -EINVAL; |
| 224 | |
| 225 | BT_DBG("id %d", req->id); |
| 226 | |
| 227 | hdev = hci_dev_get(req->id); |
| 228 | if (!hdev || hdev->amp_type == HCI_BREDR) { |
| 229 | struct a2mp_amp_assoc_rsp rsp; |
| 230 | rsp.id = req->id; |
| 231 | rsp.status = A2MP_STATUS_INVALID_CTRL_ID; |
| 232 | |
| 233 | a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, hdr->ident, sizeof(rsp), |
| 234 | &rsp); |
| 235 | goto clean; |
| 236 | } |
| 237 | |
| 238 | /* Placeholder for HCI Read AMP Assoc */ |
| 239 | |
| 240 | clean: |
| 241 | if (hdev) |
| 242 | hci_dev_put(hdev); |
| 243 | |
| 244 | skb_pull(skb, sizeof(*req)); |
| 245 | return 0; |
| 246 | } |
| 247 | |
Andrei Emeltchenko | e072f5d | 2012-05-29 13:59:13 +0300 | [diff] [blame] | 248 | static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb, |
| 249 | struct a2mp_cmd *hdr) |
| 250 | { |
| 251 | struct a2mp_physlink_req *req = (void *) skb->data; |
| 252 | |
| 253 | struct a2mp_physlink_rsp rsp; |
| 254 | struct hci_dev *hdev; |
| 255 | |
| 256 | if (le16_to_cpu(hdr->len) < sizeof(*req)) |
| 257 | return -EINVAL; |
| 258 | |
| 259 | BT_DBG("local_id %d, remote_id %d", req->local_id, req->remote_id); |
| 260 | |
| 261 | rsp.local_id = req->remote_id; |
| 262 | rsp.remote_id = req->local_id; |
| 263 | |
| 264 | hdev = hci_dev_get(req->remote_id); |
| 265 | if (!hdev || hdev->amp_type != HCI_AMP) { |
| 266 | rsp.status = A2MP_STATUS_INVALID_CTRL_ID; |
| 267 | goto send_rsp; |
| 268 | } |
| 269 | |
| 270 | /* TODO process physlink create */ |
| 271 | |
| 272 | rsp.status = A2MP_STATUS_SUCCESS; |
| 273 | |
| 274 | send_rsp: |
| 275 | if (hdev) |
| 276 | hci_dev_put(hdev); |
| 277 | |
| 278 | a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, hdr->ident, sizeof(rsp), |
| 279 | &rsp); |
| 280 | |
| 281 | skb_pull(skb, le16_to_cpu(hdr->len)); |
| 282 | return 0; |
| 283 | } |
| 284 | |
Andrei Emeltchenko | 6113f84 | 2012-05-29 13:59:14 +0300 | [diff] [blame] | 285 | static int a2mp_discphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb, |
| 286 | struct a2mp_cmd *hdr) |
| 287 | { |
| 288 | struct a2mp_physlink_req *req = (void *) skb->data; |
| 289 | struct a2mp_physlink_rsp rsp; |
| 290 | struct hci_dev *hdev; |
| 291 | |
| 292 | if (le16_to_cpu(hdr->len) < sizeof(*req)) |
| 293 | return -EINVAL; |
| 294 | |
| 295 | BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id); |
| 296 | |
| 297 | rsp.local_id = req->remote_id; |
| 298 | rsp.remote_id = req->local_id; |
| 299 | rsp.status = A2MP_STATUS_SUCCESS; |
| 300 | |
| 301 | hdev = hci_dev_get(req->local_id); |
| 302 | if (!hdev) { |
| 303 | rsp.status = A2MP_STATUS_INVALID_CTRL_ID; |
| 304 | goto send_rsp; |
| 305 | } |
| 306 | |
| 307 | /* TODO Disconnect Phys Link here */ |
| 308 | |
| 309 | hci_dev_put(hdev); |
| 310 | |
| 311 | send_rsp: |
| 312 | a2mp_send(mgr, A2MP_DISCONNPHYSLINK_RSP, hdr->ident, sizeof(rsp), &rsp); |
| 313 | |
| 314 | skb_pull(skb, sizeof(*req)); |
| 315 | return 0; |
| 316 | } |
| 317 | |
Andrei Emeltchenko | f6410a8 | 2012-05-29 13:59:15 +0300 | [diff] [blame] | 318 | static inline int a2mp_cmd_rsp(struct amp_mgr *mgr, struct sk_buff *skb, |
| 319 | struct a2mp_cmd *hdr) |
| 320 | { |
Andrei Emeltchenko | 8e8c7e3 | 2012-07-19 17:03:41 +0300 | [diff] [blame] | 321 | BT_DBG("ident %d code 0x%2.2x", hdr->ident, hdr->code); |
Andrei Emeltchenko | f6410a8 | 2012-05-29 13:59:15 +0300 | [diff] [blame] | 322 | |
| 323 | skb_pull(skb, le16_to_cpu(hdr->len)); |
| 324 | return 0; |
| 325 | } |
| 326 | |
Andrei Emeltchenko | 6b44d9b | 2012-05-29 13:59:07 +0300 | [diff] [blame] | 327 | /* Handle A2MP signalling */ |
| 328 | static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
| 329 | { |
Andrei Emeltchenko | d9fc1d5 | 2012-07-19 17:03:46 +0300 | [diff] [blame] | 330 | struct a2mp_cmd *hdr; |
Andrei Emeltchenko | 6b44d9b | 2012-05-29 13:59:07 +0300 | [diff] [blame] | 331 | struct amp_mgr *mgr = chan->data; |
| 332 | int err = 0; |
| 333 | |
| 334 | amp_mgr_get(mgr); |
| 335 | |
| 336 | while (skb->len >= sizeof(*hdr)) { |
Andrei Emeltchenko | d9fc1d5 | 2012-07-19 17:03:46 +0300 | [diff] [blame] | 337 | u16 len; |
| 338 | |
| 339 | hdr = (void *) skb->data; |
| 340 | len = le16_to_cpu(hdr->len); |
Andrei Emeltchenko | 6b44d9b | 2012-05-29 13:59:07 +0300 | [diff] [blame] | 341 | |
Andrei Emeltchenko | 8e8c7e3 | 2012-07-19 17:03:41 +0300 | [diff] [blame] | 342 | BT_DBG("code 0x%2.2x id %d len %u", hdr->code, hdr->ident, len); |
Andrei Emeltchenko | 6b44d9b | 2012-05-29 13:59:07 +0300 | [diff] [blame] | 343 | |
| 344 | skb_pull(skb, sizeof(*hdr)); |
| 345 | |
| 346 | if (len > skb->len || !hdr->ident) { |
| 347 | err = -EINVAL; |
| 348 | break; |
| 349 | } |
| 350 | |
| 351 | mgr->ident = hdr->ident; |
| 352 | |
| 353 | switch (hdr->code) { |
| 354 | case A2MP_COMMAND_REJ: |
Andrei Emeltchenko | 21dbd2c | 2012-05-29 13:59:08 +0300 | [diff] [blame] | 355 | a2mp_command_rej(mgr, skb, hdr); |
| 356 | break; |
| 357 | |
Andrei Emeltchenko | 6b44d9b | 2012-05-29 13:59:07 +0300 | [diff] [blame] | 358 | case A2MP_DISCOVER_REQ: |
Andrei Emeltchenko | 8598d06 | 2012-05-29 13:59:09 +0300 | [diff] [blame] | 359 | err = a2mp_discover_req(mgr, skb, hdr); |
| 360 | break; |
| 361 | |
Andrei Emeltchenko | 6b44d9b | 2012-05-29 13:59:07 +0300 | [diff] [blame] | 362 | case A2MP_CHANGE_NOTIFY: |
Andrei Emeltchenko | 329d81af | 2012-05-29 13:59:10 +0300 | [diff] [blame] | 363 | err = a2mp_change_notify(mgr, skb, hdr); |
| 364 | break; |
| 365 | |
Andrei Emeltchenko | 6b44d9b | 2012-05-29 13:59:07 +0300 | [diff] [blame] | 366 | case A2MP_GETINFO_REQ: |
Andrei Emeltchenko | 47f2d97 | 2012-05-29 13:59:11 +0300 | [diff] [blame] | 367 | err = a2mp_getinfo_req(mgr, skb, hdr); |
| 368 | break; |
| 369 | |
Andrei Emeltchenko | 6b44d9b | 2012-05-29 13:59:07 +0300 | [diff] [blame] | 370 | case A2MP_GETAMPASSOC_REQ: |
Andrei Emeltchenko | a28381dc | 2012-05-29 13:59:12 +0300 | [diff] [blame] | 371 | err = a2mp_getampassoc_req(mgr, skb, hdr); |
| 372 | break; |
| 373 | |
Andrei Emeltchenko | 6b44d9b | 2012-05-29 13:59:07 +0300 | [diff] [blame] | 374 | case A2MP_CREATEPHYSLINK_REQ: |
Andrei Emeltchenko | e072f5d | 2012-05-29 13:59:13 +0300 | [diff] [blame] | 375 | err = a2mp_createphyslink_req(mgr, skb, hdr); |
| 376 | break; |
| 377 | |
Andrei Emeltchenko | 6b44d9b | 2012-05-29 13:59:07 +0300 | [diff] [blame] | 378 | case A2MP_DISCONNPHYSLINK_REQ: |
Andrei Emeltchenko | 6113f84 | 2012-05-29 13:59:14 +0300 | [diff] [blame] | 379 | err = a2mp_discphyslink_req(mgr, skb, hdr); |
| 380 | break; |
| 381 | |
Andrei Emeltchenko | 6b44d9b | 2012-05-29 13:59:07 +0300 | [diff] [blame] | 382 | case A2MP_CHANGE_RSP: |
| 383 | case A2MP_DISCOVER_RSP: |
| 384 | case A2MP_GETINFO_RSP: |
| 385 | case A2MP_GETAMPASSOC_RSP: |
| 386 | case A2MP_CREATEPHYSLINK_RSP: |
| 387 | case A2MP_DISCONNPHYSLINK_RSP: |
Andrei Emeltchenko | f6410a8 | 2012-05-29 13:59:15 +0300 | [diff] [blame] | 388 | err = a2mp_cmd_rsp(mgr, skb, hdr); |
| 389 | break; |
| 390 | |
Andrei Emeltchenko | 6b44d9b | 2012-05-29 13:59:07 +0300 | [diff] [blame] | 391 | default: |
| 392 | BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code); |
| 393 | err = -EINVAL; |
| 394 | break; |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | if (err) { |
| 399 | struct a2mp_cmd_rej rej; |
Andrei Emeltchenko | d9fc1d5 | 2012-07-19 17:03:46 +0300 | [diff] [blame] | 400 | |
Andrei Emeltchenko | 6b44d9b | 2012-05-29 13:59:07 +0300 | [diff] [blame] | 401 | rej.reason = __constant_cpu_to_le16(0); |
Andrei Emeltchenko | d9fc1d5 | 2012-07-19 17:03:46 +0300 | [diff] [blame] | 402 | hdr = (void *) skb->data; |
Andrei Emeltchenko | 6b44d9b | 2012-05-29 13:59:07 +0300 | [diff] [blame] | 403 | |
| 404 | BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err); |
| 405 | |
| 406 | a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej), |
| 407 | &rej); |
| 408 | } |
| 409 | |
| 410 | /* Always free skb and return success error code to prevent |
| 411 | from sending L2CAP Disconnect over A2MP channel */ |
| 412 | kfree_skb(skb); |
| 413 | |
| 414 | amp_mgr_put(mgr); |
| 415 | |
| 416 | return 0; |
| 417 | } |
| 418 | |
Andrei Emeltchenko | 46d5c90 | 2012-05-29 13:59:04 +0300 | [diff] [blame] | 419 | static void a2mp_chan_close_cb(struct l2cap_chan *chan) |
| 420 | { |
Jaganath Kanakkassery | 4af66c6 | 2012-07-13 18:17:55 +0530 | [diff] [blame] | 421 | l2cap_chan_put(chan); |
Andrei Emeltchenko | 46d5c90 | 2012-05-29 13:59:04 +0300 | [diff] [blame] | 422 | } |
| 423 | |
| 424 | static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state) |
| 425 | { |
| 426 | struct amp_mgr *mgr = chan->data; |
| 427 | |
| 428 | if (!mgr) |
| 429 | return; |
| 430 | |
| 431 | BT_DBG("chan %p state %s", chan, state_to_string(state)); |
| 432 | |
| 433 | chan->state = state; |
| 434 | |
| 435 | switch (state) { |
| 436 | case BT_CLOSED: |
| 437 | if (mgr) |
| 438 | amp_mgr_put(mgr); |
| 439 | break; |
| 440 | } |
| 441 | } |
| 442 | |
| 443 | static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan, |
| 444 | unsigned long len, int nb) |
| 445 | { |
| 446 | return bt_skb_alloc(len, GFP_KERNEL); |
| 447 | } |
| 448 | |
Andrei Emeltchenko | 466f800 | 2012-05-29 13:59:01 +0300 | [diff] [blame] | 449 | static struct l2cap_ops a2mp_chan_ops = { |
| 450 | .name = "L2CAP A2MP channel", |
Andrei Emeltchenko | 6b44d9b | 2012-05-29 13:59:07 +0300 | [diff] [blame] | 451 | .recv = a2mp_chan_recv_cb, |
Andrei Emeltchenko | 46d5c90 | 2012-05-29 13:59:04 +0300 | [diff] [blame] | 452 | .close = a2mp_chan_close_cb, |
| 453 | .state_change = a2mp_chan_state_change_cb, |
| 454 | .alloc_skb = a2mp_chan_alloc_skb_cb, |
| 455 | |
| 456 | /* Not implemented for A2MP */ |
Gustavo Padovan | 7e1af8a | 2012-05-29 13:19:26 -0300 | [diff] [blame] | 457 | .new_connection = l2cap_chan_no_new_connection, |
| 458 | .teardown = l2cap_chan_no_teardown, |
| 459 | .ready = l2cap_chan_no_ready, |
Andrei Emeltchenko | 466f800 | 2012-05-29 13:59:01 +0300 | [diff] [blame] | 460 | }; |
| 461 | |
| 462 | static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn) |
| 463 | { |
| 464 | struct l2cap_chan *chan; |
| 465 | int err; |
| 466 | |
| 467 | chan = l2cap_chan_create(); |
| 468 | if (!chan) |
| 469 | return NULL; |
| 470 | |
| 471 | BT_DBG("chan %p", chan); |
| 472 | |
Andrei Emeltchenko | 416fa75 | 2012-05-29 13:59:16 +0300 | [diff] [blame] | 473 | chan->chan_type = L2CAP_CHAN_CONN_FIX_A2MP; |
Andrei Emeltchenko | 466f800 | 2012-05-29 13:59:01 +0300 | [diff] [blame] | 474 | chan->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
| 475 | |
| 476 | chan->ops = &a2mp_chan_ops; |
| 477 | |
| 478 | l2cap_chan_set_defaults(chan); |
| 479 | chan->remote_max_tx = chan->max_tx; |
| 480 | chan->remote_tx_win = chan->tx_win; |
| 481 | |
| 482 | chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO; |
| 483 | chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO; |
| 484 | |
| 485 | skb_queue_head_init(&chan->tx_q); |
| 486 | |
| 487 | chan->mode = L2CAP_MODE_ERTM; |
| 488 | |
| 489 | err = l2cap_ertm_init(chan); |
| 490 | if (err < 0) { |
| 491 | l2cap_chan_del(chan, 0); |
| 492 | return NULL; |
| 493 | } |
| 494 | |
| 495 | chan->conf_state = 0; |
| 496 | |
| 497 | l2cap_chan_add(conn, chan); |
| 498 | |
| 499 | chan->remote_mps = chan->omtu; |
| 500 | chan->mps = chan->omtu; |
| 501 | |
| 502 | chan->state = BT_CONNECTED; |
| 503 | |
| 504 | return chan; |
| 505 | } |
Andrei Emeltchenko | 9740e49 | 2012-05-29 13:59:02 +0300 | [diff] [blame] | 506 | |
| 507 | /* AMP Manager functions */ |
| 508 | void amp_mgr_get(struct amp_mgr *mgr) |
| 509 | { |
Andrei Emeltchenko | a0dfe0a | 2012-07-11 14:43:35 +0300 | [diff] [blame] | 510 | BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount)); |
Andrei Emeltchenko | 9740e49 | 2012-05-29 13:59:02 +0300 | [diff] [blame] | 511 | |
| 512 | kref_get(&mgr->kref); |
| 513 | } |
| 514 | |
| 515 | static void amp_mgr_destroy(struct kref *kref) |
| 516 | { |
| 517 | struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref); |
| 518 | |
| 519 | BT_DBG("mgr %p", mgr); |
| 520 | |
Andrei Emeltchenko | f97268f | 2012-09-27 17:26:07 +0300 | [diff] [blame] | 521 | mutex_lock(&_mgr_list_lock); |
| 522 | list_del(&mgr->list); |
| 523 | mutex_unlock(&_mgr_list_lock); |
| 524 | |
Andrei Emeltchenko | 9740e49 | 2012-05-29 13:59:02 +0300 | [diff] [blame] | 525 | kfree(mgr); |
| 526 | } |
| 527 | |
| 528 | int amp_mgr_put(struct amp_mgr *mgr) |
| 529 | { |
Andrei Emeltchenko | a0dfe0a | 2012-07-11 14:43:35 +0300 | [diff] [blame] | 530 | BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount)); |
Andrei Emeltchenko | 9740e49 | 2012-05-29 13:59:02 +0300 | [diff] [blame] | 531 | |
| 532 | return kref_put(&mgr->kref, &_mgr_destroy); |
| 533 | } |
| 534 | |
| 535 | static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn) |
| 536 | { |
| 537 | struct amp_mgr *mgr; |
| 538 | struct l2cap_chan *chan; |
| 539 | |
| 540 | mgr = kzalloc(sizeof(*mgr), GFP_KERNEL); |
| 541 | if (!mgr) |
| 542 | return NULL; |
| 543 | |
| 544 | BT_DBG("conn %p mgr %p", conn, mgr); |
| 545 | |
| 546 | mgr->l2cap_conn = conn; |
| 547 | |
| 548 | chan = a2mp_chan_open(conn); |
| 549 | if (!chan) { |
| 550 | kfree(mgr); |
| 551 | return NULL; |
| 552 | } |
| 553 | |
| 554 | mgr->a2mp_chan = chan; |
| 555 | chan->data = mgr; |
| 556 | |
| 557 | conn->hcon->amp_mgr = mgr; |
| 558 | |
| 559 | kref_init(&mgr->kref); |
| 560 | |
Andrei Emeltchenko | f97268f | 2012-09-27 17:26:07 +0300 | [diff] [blame] | 561 | mutex_lock(&_mgr_list_lock); |
| 562 | list_add(&mgr->list, &_mgr_list); |
| 563 | mutex_unlock(&_mgr_list_lock); |
| 564 | |
Andrei Emeltchenko | 9740e49 | 2012-05-29 13:59:02 +0300 | [diff] [blame] | 565 | return mgr; |
| 566 | } |
Andrei Emeltchenko | 97e8e89 | 2012-05-29 13:59:17 +0300 | [diff] [blame] | 567 | |
| 568 | struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn, |
| 569 | struct sk_buff *skb) |
| 570 | { |
| 571 | struct amp_mgr *mgr; |
| 572 | |
| 573 | mgr = amp_mgr_create(conn); |
| 574 | if (!mgr) { |
| 575 | BT_ERR("Could not create AMP manager"); |
| 576 | return NULL; |
| 577 | } |
| 578 | |
| 579 | BT_DBG("mgr: %p chan %p", mgr, mgr->a2mp_chan); |
| 580 | |
| 581 | return mgr->a2mp_chan; |
| 582 | } |
Andrei Emeltchenko | f97268f | 2012-09-27 17:26:07 +0300 | [diff] [blame] | 583 | |
| 584 | struct amp_mgr *amp_mgr_lookup_by_state(u8 state) |
| 585 | { |
| 586 | struct amp_mgr *mgr; |
| 587 | |
| 588 | mutex_lock(&_mgr_list_lock); |
| 589 | list_for_each_entry(mgr, &_mgr_list, list) { |
| 590 | if (mgr->state == state) { |
| 591 | amp_mgr_get(mgr); |
| 592 | mutex_unlock(&_mgr_list_lock); |
| 593 | return mgr; |
| 594 | } |
| 595 | } |
| 596 | mutex_unlock(&_mgr_list_lock); |
| 597 | |
| 598 | return NULL; |
| 599 | } |
Andrei Emeltchenko | 8e2a0d9 | 2012-09-27 17:26:08 +0300 | [diff] [blame^] | 600 | |
| 601 | void a2mp_send_getinfo_rsp(struct hci_dev *hdev) |
| 602 | { |
| 603 | struct amp_mgr *mgr; |
| 604 | struct a2mp_info_rsp rsp; |
| 605 | |
| 606 | mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_INFO); |
| 607 | if (!mgr) |
| 608 | return; |
| 609 | |
| 610 | BT_DBG("%s mgr %p", hdev->name, mgr); |
| 611 | |
| 612 | rsp.id = hdev->id; |
| 613 | rsp.status = A2MP_STATUS_INVALID_CTRL_ID; |
| 614 | |
| 615 | if (hdev->amp_type != HCI_BREDR) { |
| 616 | rsp.status = 0; |
| 617 | rsp.total_bw = cpu_to_le32(hdev->amp_total_bw); |
| 618 | rsp.max_bw = cpu_to_le32(hdev->amp_max_bw); |
| 619 | rsp.min_latency = cpu_to_le32(hdev->amp_min_latency); |
| 620 | rsp.pal_cap = cpu_to_le16(hdev->amp_pal_cap); |
| 621 | rsp.assoc_size = cpu_to_le16(hdev->amp_assoc_size); |
| 622 | } |
| 623 | |
| 624 | a2mp_send(mgr, A2MP_GETINFO_RSP, mgr->ident, sizeof(rsp), &rsp); |
| 625 | amp_mgr_put(mgr); |
| 626 | } |