Johan Hedberg | 7dec65c | 2012-07-16 16:12:02 +0300 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Bluetooth HCI Three-wire UART driver |
| 4 | * |
| 5 | * Copyright (C) 2012 Intel Corporation |
| 6 | * |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/skbuff.h> |
| 27 | |
| 28 | #include <net/bluetooth/bluetooth.h> |
| 29 | #include <net/bluetooth/hci_core.h> |
| 30 | |
| 31 | #include "hci_uart.h" |
| 32 | |
Johan Hedberg | c0a1b73 | 2012-07-16 16:12:06 +0300 | [diff] [blame] | 33 | #define HCI_3WIRE_ACK_PKT 0 |
| 34 | #define HCI_3WIRE_LINK_PKT 15 |
| 35 | |
Johan Hedberg | afdc944 | 2012-07-16 16:12:18 +0300 | [diff] [blame] | 36 | /* Sliding window size */ |
| 37 | #define H5_TX_WIN_MAX 4 |
Johan Hedberg | 3f27e95 | 2012-07-16 16:12:04 +0300 | [diff] [blame] | 38 | |
| 39 | #define H5_ACK_TIMEOUT msecs_to_jiffies(250) |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 40 | #define H5_SYNC_TIMEOUT msecs_to_jiffies(100) |
Johan Hedberg | 3f27e95 | 2012-07-16 16:12:04 +0300 | [diff] [blame] | 41 | |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 42 | /* |
| 43 | * Maximum Three-wire packet: |
| 44 | * 4 byte header + max value for 12-bit length + 2 bytes for CRC |
| 45 | */ |
| 46 | #define H5_MAX_LEN (4 + 0xfff + 2) |
| 47 | |
Johan Hedberg | 01977c0 | 2012-07-16 16:12:07 +0300 | [diff] [blame] | 48 | /* Convenience macros for reading Three-wire header values */ |
| 49 | #define H5_HDR_SEQ(hdr) ((hdr)[0] & 0x07) |
| 50 | #define H5_HDR_ACK(hdr) (((hdr)[0] >> 3) & 0x07) |
| 51 | #define H5_HDR_CRC(hdr) (((hdr)[0] >> 6) & 0x01) |
| 52 | #define H5_HDR_RELIABLE(hdr) (((hdr)[0] >> 7) & 0x01) |
| 53 | #define H5_HDR_PKT_TYPE(hdr) ((hdr)[1] & 0x0f) |
Andrei Emeltchenko | 4223f36 | 2015-11-19 11:29:11 +0200 | [diff] [blame] | 54 | #define H5_HDR_LEN(hdr) ((((hdr)[1] >> 4) & 0x0f) + ((hdr)[2] << 4)) |
Johan Hedberg | 01977c0 | 2012-07-16 16:12:07 +0300 | [diff] [blame] | 55 | |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 56 | #define SLIP_DELIMITER 0xc0 |
| 57 | #define SLIP_ESC 0xdb |
| 58 | #define SLIP_ESC_DELIM 0xdc |
| 59 | #define SLIP_ESC_ESC 0xdd |
| 60 | |
Johan Hedberg | e048210 | 2012-07-16 16:12:19 +0300 | [diff] [blame] | 61 | /* H5 state flags */ |
| 62 | enum { |
| 63 | H5_RX_ESC, /* SLIP escape mode */ |
| 64 | H5_TX_ACK_REQ, /* Pending ack to send */ |
| 65 | }; |
| 66 | |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 67 | struct h5 { |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 68 | struct sk_buff_head unack; /* Unack'ed packets queue */ |
| 69 | struct sk_buff_head rel; /* Reliable packets queue */ |
| 70 | struct sk_buff_head unrel; /* Unreliable packets queue */ |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 71 | |
Johan Hedberg | e048210 | 2012-07-16 16:12:19 +0300 | [diff] [blame] | 72 | unsigned long flags; |
| 73 | |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 74 | struct sk_buff *rx_skb; /* Receive buffer */ |
| 75 | size_t rx_pending; /* Expecting more bytes */ |
Johan Hedberg | 43eb12d | 2012-07-16 16:12:08 +0300 | [diff] [blame] | 76 | u8 rx_ack; /* Last ack number received */ |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 77 | |
Prasanna Karthik | fa4cf04 | 2015-07-23 11:22:56 +0000 | [diff] [blame] | 78 | int (*rx_func)(struct hci_uart *hu, u8 c); |
Johan Hedberg | 3f27e95 | 2012-07-16 16:12:04 +0300 | [diff] [blame] | 79 | |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 80 | struct timer_list timer; /* Retransmission timer */ |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 81 | |
Johan Hedberg | 43eb12d | 2012-07-16 16:12:08 +0300 | [diff] [blame] | 82 | u8 tx_seq; /* Next seq number to send */ |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 83 | u8 tx_ack; /* Next ack number to send */ |
Johan Hedberg | afdc944 | 2012-07-16 16:12:18 +0300 | [diff] [blame] | 84 | u8 tx_win; /* Sliding window size */ |
Johan Hedberg | 10122d0 | 2012-07-16 16:12:14 +0300 | [diff] [blame] | 85 | |
Johan Hedberg | f674a05 | 2012-07-16 16:12:15 +0300 | [diff] [blame] | 86 | enum { |
| 87 | H5_UNINITIALIZED, |
| 88 | H5_INITIALIZED, |
| 89 | H5_ACTIVE, |
| 90 | } state; |
| 91 | |
Johan Hedberg | 95c5c22 | 2012-07-16 16:12:16 +0300 | [diff] [blame] | 92 | enum { |
| 93 | H5_AWAKE, |
| 94 | H5_SLEEPING, |
| 95 | H5_WAKING_UP, |
| 96 | } sleep; |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 97 | }; |
| 98 | |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 99 | static void h5_reset_rx(struct h5 *h5); |
| 100 | |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 101 | static void h5_link_control(struct hci_uart *hu, const void *data, size_t len) |
| 102 | { |
| 103 | struct h5 *h5 = hu->priv; |
| 104 | struct sk_buff *nskb; |
| 105 | |
| 106 | nskb = alloc_skb(3, GFP_ATOMIC); |
| 107 | if (!nskb) |
| 108 | return; |
| 109 | |
Marcel Holtmann | 618e8bc | 2015-11-05 07:33:56 +0100 | [diff] [blame] | 110 | hci_skb_pkt_type(nskb) = HCI_3WIRE_LINK_PKT; |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 111 | |
| 112 | memcpy(skb_put(nskb, len), data, len); |
| 113 | |
| 114 | skb_queue_tail(&h5->unrel, nskb); |
| 115 | } |
| 116 | |
Johan Hedberg | afdc944 | 2012-07-16 16:12:18 +0300 | [diff] [blame] | 117 | static u8 h5_cfg_field(struct h5 *h5) |
| 118 | { |
Johan Hedberg | afdc944 | 2012-07-16 16:12:18 +0300 | [diff] [blame] | 119 | /* Sliding window size (first 3 bits) */ |
Andrei Emeltchenko | 742c595 | 2015-11-26 16:49:34 +0200 | [diff] [blame] | 120 | return h5->tx_win & 0x07; |
Johan Hedberg | afdc944 | 2012-07-16 16:12:18 +0300 | [diff] [blame] | 121 | } |
| 122 | |
Johan Hedberg | f674a05 | 2012-07-16 16:12:15 +0300 | [diff] [blame] | 123 | static void h5_timed_event(unsigned long arg) |
| 124 | { |
| 125 | const unsigned char sync_req[] = { 0x01, 0x7e }; |
Andrei Emeltchenko | 87a6b9b | 2015-12-10 17:03:43 +0200 | [diff] [blame] | 126 | unsigned char conf_req[3] = { 0x03, 0xfc }; |
Prasanna Karthik | 4a2fa2b | 2015-09-30 13:02:05 +0000 | [diff] [blame] | 127 | struct hci_uart *hu = (struct hci_uart *)arg; |
Johan Hedberg | f674a05 | 2012-07-16 16:12:15 +0300 | [diff] [blame] | 128 | struct h5 *h5 = hu->priv; |
| 129 | struct sk_buff *skb; |
| 130 | unsigned long flags; |
| 131 | |
Johan Hedberg | 95c5c22 | 2012-07-16 16:12:16 +0300 | [diff] [blame] | 132 | BT_DBG("%s", hu->hdev->name); |
| 133 | |
Johan Hedberg | f674a05 | 2012-07-16 16:12:15 +0300 | [diff] [blame] | 134 | if (h5->state == H5_UNINITIALIZED) |
| 135 | h5_link_control(hu, sync_req, sizeof(sync_req)); |
| 136 | |
Johan Hedberg | afdc944 | 2012-07-16 16:12:18 +0300 | [diff] [blame] | 137 | if (h5->state == H5_INITIALIZED) { |
| 138 | conf_req[2] = h5_cfg_field(h5); |
Johan Hedberg | f674a05 | 2012-07-16 16:12:15 +0300 | [diff] [blame] | 139 | h5_link_control(hu, conf_req, sizeof(conf_req)); |
Johan Hedberg | afdc944 | 2012-07-16 16:12:18 +0300 | [diff] [blame] | 140 | } |
Johan Hedberg | f674a05 | 2012-07-16 16:12:15 +0300 | [diff] [blame] | 141 | |
| 142 | if (h5->state != H5_ACTIVE) { |
| 143 | mod_timer(&h5->timer, jiffies + H5_SYNC_TIMEOUT); |
| 144 | goto wakeup; |
| 145 | } |
| 146 | |
Johan Hedberg | 95c5c22 | 2012-07-16 16:12:16 +0300 | [diff] [blame] | 147 | if (h5->sleep != H5_AWAKE) { |
| 148 | h5->sleep = H5_SLEEPING; |
| 149 | goto wakeup; |
| 150 | } |
| 151 | |
Johan Hedberg | f674a05 | 2012-07-16 16:12:15 +0300 | [diff] [blame] | 152 | BT_DBG("hu %p retransmitting %u pkts", hu, h5->unack.qlen); |
| 153 | |
| 154 | spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING); |
| 155 | |
| 156 | while ((skb = __skb_dequeue_tail(&h5->unack)) != NULL) { |
| 157 | h5->tx_seq = (h5->tx_seq - 1) & 0x07; |
| 158 | skb_queue_head(&h5->rel, skb); |
| 159 | } |
| 160 | |
| 161 | spin_unlock_irqrestore(&h5->unack.lock, flags); |
| 162 | |
| 163 | wakeup: |
| 164 | hci_uart_tx_wakeup(hu); |
| 165 | } |
| 166 | |
Loic Poulain | b509c02 | 2014-10-08 16:54:28 +0200 | [diff] [blame] | 167 | static void h5_peer_reset(struct hci_uart *hu) |
| 168 | { |
| 169 | struct h5 *h5 = hu->priv; |
Loic Poulain | b509c02 | 2014-10-08 16:54:28 +0200 | [diff] [blame] | 170 | |
| 171 | BT_ERR("Peer device has reset"); |
| 172 | |
| 173 | h5->state = H5_UNINITIALIZED; |
| 174 | |
| 175 | del_timer(&h5->timer); |
| 176 | |
| 177 | skb_queue_purge(&h5->rel); |
| 178 | skb_queue_purge(&h5->unrel); |
| 179 | skb_queue_purge(&h5->unack); |
| 180 | |
| 181 | h5->tx_seq = 0; |
| 182 | h5->tx_ack = 0; |
| 183 | |
Marcel Holtmann | 882809f | 2014-11-02 08:15:39 +0100 | [diff] [blame] | 184 | /* Send reset request to upper stack */ |
| 185 | hci_reset_dev(hu->hdev); |
Loic Poulain | b509c02 | 2014-10-08 16:54:28 +0200 | [diff] [blame] | 186 | } |
| 187 | |
Johan Hedberg | 7dec65c | 2012-07-16 16:12:02 +0300 | [diff] [blame] | 188 | static int h5_open(struct hci_uart *hu) |
| 189 | { |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 190 | struct h5 *h5; |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 191 | const unsigned char sync[] = { 0x01, 0x7e }; |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 192 | |
| 193 | BT_DBG("hu %p", hu); |
| 194 | |
| 195 | h5 = kzalloc(sizeof(*h5), GFP_KERNEL); |
| 196 | if (!h5) |
| 197 | return -ENOMEM; |
| 198 | |
| 199 | hu->priv = h5; |
| 200 | |
| 201 | skb_queue_head_init(&h5->unack); |
| 202 | skb_queue_head_init(&h5->rel); |
| 203 | skb_queue_head_init(&h5->unrel); |
| 204 | |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 205 | h5_reset_rx(h5); |
| 206 | |
Prasanna Karthik | a1e0d04 | 2016-10-18 17:30:10 +0000 | [diff] [blame] | 207 | setup_timer(&h5->timer, h5_timed_event, (unsigned long)hu); |
Johan Hedberg | 3f27e95 | 2012-07-16 16:12:04 +0300 | [diff] [blame] | 208 | |
Johan Hedberg | afdc944 | 2012-07-16 16:12:18 +0300 | [diff] [blame] | 209 | h5->tx_win = H5_TX_WIN_MAX; |
| 210 | |
Johan Hedberg | cd1b442 | 2012-07-16 16:12:12 +0300 | [diff] [blame] | 211 | set_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags); |
| 212 | |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 213 | /* Send initial sync request */ |
| 214 | h5_link_control(hu, sync, sizeof(sync)); |
| 215 | mod_timer(&h5->timer, jiffies + H5_SYNC_TIMEOUT); |
| 216 | |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 217 | return 0; |
Johan Hedberg | 7dec65c | 2012-07-16 16:12:02 +0300 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | static int h5_close(struct hci_uart *hu) |
| 221 | { |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 222 | struct h5 *h5 = hu->priv; |
| 223 | |
Michael Knudsen | c327cdd | 2014-02-18 09:48:08 +0100 | [diff] [blame] | 224 | del_timer_sync(&h5->timer); |
| 225 | |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 226 | skb_queue_purge(&h5->unack); |
| 227 | skb_queue_purge(&h5->rel); |
| 228 | skb_queue_purge(&h5->unrel); |
| 229 | |
| 230 | kfree(h5); |
| 231 | |
| 232 | return 0; |
Johan Hedberg | 7dec65c | 2012-07-16 16:12:02 +0300 | [diff] [blame] | 233 | } |
| 234 | |
Johan Hedberg | 43eb12d | 2012-07-16 16:12:08 +0300 | [diff] [blame] | 235 | static void h5_pkt_cull(struct h5 *h5) |
| 236 | { |
| 237 | struct sk_buff *skb, *tmp; |
| 238 | unsigned long flags; |
| 239 | int i, to_remove; |
| 240 | u8 seq; |
| 241 | |
| 242 | spin_lock_irqsave(&h5->unack.lock, flags); |
| 243 | |
| 244 | to_remove = skb_queue_len(&h5->unack); |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 245 | if (to_remove == 0) |
| 246 | goto unlock; |
Johan Hedberg | 43eb12d | 2012-07-16 16:12:08 +0300 | [diff] [blame] | 247 | |
| 248 | seq = h5->tx_seq; |
| 249 | |
| 250 | while (to_remove > 0) { |
| 251 | if (h5->rx_ack == seq) |
| 252 | break; |
| 253 | |
| 254 | to_remove--; |
Loic Poulain | 4807b51 | 2014-08-08 19:07:16 +0200 | [diff] [blame] | 255 | seq = (seq - 1) & 0x07; |
Johan Hedberg | 43eb12d | 2012-07-16 16:12:08 +0300 | [diff] [blame] | 256 | } |
| 257 | |
| 258 | if (seq != h5->rx_ack) |
| 259 | BT_ERR("Controller acked invalid packet"); |
| 260 | |
| 261 | i = 0; |
| 262 | skb_queue_walk_safe(&h5->unack, skb, tmp) { |
| 263 | if (i++ >= to_remove) |
| 264 | break; |
| 265 | |
| 266 | __skb_unlink(skb, &h5->unack); |
| 267 | kfree_skb(skb); |
| 268 | } |
| 269 | |
| 270 | if (skb_queue_empty(&h5->unack)) |
| 271 | del_timer(&h5->timer); |
| 272 | |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 273 | unlock: |
Johan Hedberg | 43eb12d | 2012-07-16 16:12:08 +0300 | [diff] [blame] | 274 | spin_unlock_irqrestore(&h5->unack.lock, flags); |
| 275 | } |
| 276 | |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 277 | static void h5_handle_internal_rx(struct hci_uart *hu) |
| 278 | { |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 279 | struct h5 *h5 = hu->priv; |
| 280 | const unsigned char sync_req[] = { 0x01, 0x7e }; |
| 281 | const unsigned char sync_rsp[] = { 0x02, 0x7d }; |
Andrei Emeltchenko | 87a6b9b | 2015-12-10 17:03:43 +0200 | [diff] [blame] | 282 | unsigned char conf_req[3] = { 0x03, 0xfc }; |
Johan Hedberg | afdc944 | 2012-07-16 16:12:18 +0300 | [diff] [blame] | 283 | const unsigned char conf_rsp[] = { 0x04, 0x7b }; |
Johan Hedberg | 10122d0 | 2012-07-16 16:12:14 +0300 | [diff] [blame] | 284 | const unsigned char wakeup_req[] = { 0x05, 0xfa }; |
| 285 | const unsigned char woken_req[] = { 0x06, 0xf9 }; |
| 286 | const unsigned char sleep_req[] = { 0x07, 0x78 }; |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 287 | const unsigned char *hdr = h5->rx_skb->data; |
| 288 | const unsigned char *data = &h5->rx_skb->data[4]; |
| 289 | |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 290 | BT_DBG("%s", hu->hdev->name); |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 291 | |
| 292 | if (H5_HDR_PKT_TYPE(hdr) != HCI_3WIRE_LINK_PKT) |
| 293 | return; |
| 294 | |
| 295 | if (H5_HDR_LEN(hdr) < 2) |
| 296 | return; |
| 297 | |
Johan Hedberg | afdc944 | 2012-07-16 16:12:18 +0300 | [diff] [blame] | 298 | conf_req[2] = h5_cfg_field(h5); |
| 299 | |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 300 | if (memcmp(data, sync_req, 2) == 0) { |
Loic Poulain | b509c02 | 2014-10-08 16:54:28 +0200 | [diff] [blame] | 301 | if (h5->state == H5_ACTIVE) |
| 302 | h5_peer_reset(hu); |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 303 | h5_link_control(hu, sync_rsp, 2); |
| 304 | } else if (memcmp(data, sync_rsp, 2) == 0) { |
Loic Poulain | b509c02 | 2014-10-08 16:54:28 +0200 | [diff] [blame] | 305 | if (h5->state == H5_ACTIVE) |
| 306 | h5_peer_reset(hu); |
Johan Hedberg | f674a05 | 2012-07-16 16:12:15 +0300 | [diff] [blame] | 307 | h5->state = H5_INITIALIZED; |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 308 | h5_link_control(hu, conf_req, 3); |
| 309 | } else if (memcmp(data, conf_req, 2) == 0) { |
| 310 | h5_link_control(hu, conf_rsp, 2); |
| 311 | h5_link_control(hu, conf_req, 3); |
| 312 | } else if (memcmp(data, conf_rsp, 2) == 0) { |
Johan Hedberg | afdc944 | 2012-07-16 16:12:18 +0300 | [diff] [blame] | 313 | if (H5_HDR_LEN(hdr) > 2) |
Andrei Emeltchenko | 1d3a1e6 | 2015-11-26 16:49:33 +0200 | [diff] [blame] | 314 | h5->tx_win = (data[2] & 0x07); |
Johan Hedberg | afdc944 | 2012-07-16 16:12:18 +0300 | [diff] [blame] | 315 | BT_DBG("Three-wire init complete. tx_win %u", h5->tx_win); |
Johan Hedberg | f674a05 | 2012-07-16 16:12:15 +0300 | [diff] [blame] | 316 | h5->state = H5_ACTIVE; |
Johan Hedberg | cd1b442 | 2012-07-16 16:12:12 +0300 | [diff] [blame] | 317 | hci_uart_init_ready(hu); |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 318 | return; |
Johan Hedberg | 10122d0 | 2012-07-16 16:12:14 +0300 | [diff] [blame] | 319 | } else if (memcmp(data, sleep_req, 2) == 0) { |
| 320 | BT_DBG("Peer went to sleep"); |
Johan Hedberg | 95c5c22 | 2012-07-16 16:12:16 +0300 | [diff] [blame] | 321 | h5->sleep = H5_SLEEPING; |
| 322 | return; |
Johan Hedberg | 10122d0 | 2012-07-16 16:12:14 +0300 | [diff] [blame] | 323 | } else if (memcmp(data, woken_req, 2) == 0) { |
| 324 | BT_DBG("Peer woke up"); |
Johan Hedberg | 95c5c22 | 2012-07-16 16:12:16 +0300 | [diff] [blame] | 325 | h5->sleep = H5_AWAKE; |
| 326 | } else if (memcmp(data, wakeup_req, 2) == 0) { |
| 327 | BT_DBG("Peer requested wakeup"); |
| 328 | h5_link_control(hu, woken_req, 2); |
| 329 | h5->sleep = H5_AWAKE; |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 330 | } else { |
| 331 | BT_DBG("Link Control: 0x%02hhx 0x%02hhx", data[0], data[1]); |
| 332 | return; |
| 333 | } |
| 334 | |
| 335 | hci_uart_tx_wakeup(hu); |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 336 | } |
| 337 | |
| 338 | static void h5_complete_rx_pkt(struct hci_uart *hu) |
| 339 | { |
| 340 | struct h5 *h5 = hu->priv; |
Johan Hedberg | 43eb12d | 2012-07-16 16:12:08 +0300 | [diff] [blame] | 341 | const unsigned char *hdr = h5->rx_skb->data; |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 342 | |
Johan Hedberg | 43eb12d | 2012-07-16 16:12:08 +0300 | [diff] [blame] | 343 | if (H5_HDR_RELIABLE(hdr)) { |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 344 | h5->tx_ack = (h5->tx_ack + 1) % 8; |
Johan Hedberg | e048210 | 2012-07-16 16:12:19 +0300 | [diff] [blame] | 345 | set_bit(H5_TX_ACK_REQ, &h5->flags); |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 346 | hci_uart_tx_wakeup(hu); |
Johan Hedberg | 43eb12d | 2012-07-16 16:12:08 +0300 | [diff] [blame] | 347 | } |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 348 | |
Johan Hedberg | 43eb12d | 2012-07-16 16:12:08 +0300 | [diff] [blame] | 349 | h5->rx_ack = H5_HDR_ACK(hdr); |
| 350 | |
| 351 | h5_pkt_cull(h5); |
| 352 | |
| 353 | switch (H5_HDR_PKT_TYPE(hdr)) { |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 354 | case HCI_EVENT_PKT: |
| 355 | case HCI_ACLDATA_PKT: |
| 356 | case HCI_SCODATA_PKT: |
Marcel Holtmann | 618e8bc | 2015-11-05 07:33:56 +0100 | [diff] [blame] | 357 | hci_skb_pkt_type(h5->rx_skb) = H5_HDR_PKT_TYPE(hdr); |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 358 | |
| 359 | /* Remove Three-wire header */ |
| 360 | skb_pull(h5->rx_skb, 4); |
| 361 | |
Marcel Holtmann | e1a2617 | 2013-10-10 16:52:43 -0700 | [diff] [blame] | 362 | hci_recv_frame(hu->hdev, h5->rx_skb); |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 363 | h5->rx_skb = NULL; |
| 364 | |
| 365 | break; |
| 366 | |
| 367 | default: |
| 368 | h5_handle_internal_rx(hu); |
| 369 | break; |
| 370 | } |
| 371 | |
| 372 | h5_reset_rx(h5); |
| 373 | } |
| 374 | |
| 375 | static int h5_rx_crc(struct hci_uart *hu, unsigned char c) |
| 376 | { |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 377 | h5_complete_rx_pkt(hu); |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 378 | |
| 379 | return 0; |
| 380 | } |
| 381 | |
| 382 | static int h5_rx_payload(struct hci_uart *hu, unsigned char c) |
| 383 | { |
| 384 | struct h5 *h5 = hu->priv; |
| 385 | const unsigned char *hdr = h5->rx_skb->data; |
| 386 | |
Johan Hedberg | 43eb12d | 2012-07-16 16:12:08 +0300 | [diff] [blame] | 387 | if (H5_HDR_CRC(hdr)) { |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 388 | h5->rx_func = h5_rx_crc; |
| 389 | h5->rx_pending = 2; |
| 390 | } else { |
| 391 | h5_complete_rx_pkt(hu); |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 392 | } |
| 393 | |
| 394 | return 0; |
| 395 | } |
| 396 | |
| 397 | static int h5_rx_3wire_hdr(struct hci_uart *hu, unsigned char c) |
| 398 | { |
| 399 | struct h5 *h5 = hu->priv; |
| 400 | const unsigned char *hdr = h5->rx_skb->data; |
| 401 | |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 402 | BT_DBG("%s rx: seq %u ack %u crc %u rel %u type %u len %u", |
| 403 | hu->hdev->name, H5_HDR_SEQ(hdr), H5_HDR_ACK(hdr), |
| 404 | H5_HDR_CRC(hdr), H5_HDR_RELIABLE(hdr), H5_HDR_PKT_TYPE(hdr), |
| 405 | H5_HDR_LEN(hdr)); |
| 406 | |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 407 | if (((hdr[0] + hdr[1] + hdr[2] + hdr[3]) & 0xff) != 0xff) { |
| 408 | BT_ERR("Invalid header checksum"); |
| 409 | h5_reset_rx(h5); |
| 410 | return 0; |
| 411 | } |
| 412 | |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 413 | if (H5_HDR_RELIABLE(hdr) && H5_HDR_SEQ(hdr) != h5->tx_ack) { |
Johan Hedberg | 43eb12d | 2012-07-16 16:12:08 +0300 | [diff] [blame] | 414 | BT_ERR("Out-of-order packet arrived (%u != %u)", |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 415 | H5_HDR_SEQ(hdr), h5->tx_ack); |
Johan Hedberg | 43eb12d | 2012-07-16 16:12:08 +0300 | [diff] [blame] | 416 | h5_reset_rx(h5); |
| 417 | return 0; |
| 418 | } |
| 419 | |
Johan Hedberg | f674a05 | 2012-07-16 16:12:15 +0300 | [diff] [blame] | 420 | if (h5->state != H5_ACTIVE && |
| 421 | H5_HDR_PKT_TYPE(hdr) != HCI_3WIRE_LINK_PKT) { |
| 422 | BT_ERR("Non-link packet received in non-active state"); |
| 423 | h5_reset_rx(h5); |
Loic Poulain | 48439d5 | 2014-06-23 17:42:44 +0200 | [diff] [blame] | 424 | return 0; |
Johan Hedberg | f674a05 | 2012-07-16 16:12:15 +0300 | [diff] [blame] | 425 | } |
| 426 | |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 427 | h5->rx_func = h5_rx_payload; |
Johan Hedberg | 43eb12d | 2012-07-16 16:12:08 +0300 | [diff] [blame] | 428 | h5->rx_pending = H5_HDR_LEN(hdr); |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 429 | |
| 430 | return 0; |
| 431 | } |
| 432 | |
| 433 | static int h5_rx_pkt_start(struct hci_uart *hu, unsigned char c) |
| 434 | { |
| 435 | struct h5 *h5 = hu->priv; |
| 436 | |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 437 | if (c == SLIP_DELIMITER) |
| 438 | return 1; |
| 439 | |
| 440 | h5->rx_func = h5_rx_3wire_hdr; |
| 441 | h5->rx_pending = 4; |
| 442 | |
| 443 | h5->rx_skb = bt_skb_alloc(H5_MAX_LEN, GFP_ATOMIC); |
| 444 | if (!h5->rx_skb) { |
| 445 | BT_ERR("Can't allocate mem for new packet"); |
| 446 | h5_reset_rx(h5); |
| 447 | return -ENOMEM; |
| 448 | } |
| 449 | |
Prasanna Karthik | 4a2fa2b | 2015-09-30 13:02:05 +0000 | [diff] [blame] | 450 | h5->rx_skb->dev = (void *)hu->hdev; |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 451 | |
| 452 | return 0; |
| 453 | } |
| 454 | |
| 455 | static int h5_rx_delimiter(struct hci_uart *hu, unsigned char c) |
| 456 | { |
| 457 | struct h5 *h5 = hu->priv; |
| 458 | |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 459 | if (c == SLIP_DELIMITER) |
| 460 | h5->rx_func = h5_rx_pkt_start; |
| 461 | |
| 462 | return 1; |
| 463 | } |
| 464 | |
| 465 | static void h5_unslip_one_byte(struct h5 *h5, unsigned char c) |
| 466 | { |
| 467 | const u8 delim = SLIP_DELIMITER, esc = SLIP_ESC; |
| 468 | const u8 *byte = &c; |
| 469 | |
Johan Hedberg | e048210 | 2012-07-16 16:12:19 +0300 | [diff] [blame] | 470 | if (!test_bit(H5_RX_ESC, &h5->flags) && c == SLIP_ESC) { |
| 471 | set_bit(H5_RX_ESC, &h5->flags); |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 472 | return; |
| 473 | } |
| 474 | |
Johan Hedberg | e048210 | 2012-07-16 16:12:19 +0300 | [diff] [blame] | 475 | if (test_and_clear_bit(H5_RX_ESC, &h5->flags)) { |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 476 | switch (c) { |
| 477 | case SLIP_ESC_DELIM: |
| 478 | byte = &delim; |
| 479 | break; |
| 480 | case SLIP_ESC_ESC: |
| 481 | byte = &esc; |
| 482 | break; |
| 483 | default: |
| 484 | BT_ERR("Invalid esc byte 0x%02hhx", c); |
| 485 | h5_reset_rx(h5); |
| 486 | return; |
| 487 | } |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 488 | } |
| 489 | |
| 490 | memcpy(skb_put(h5->rx_skb, 1), byte, 1); |
| 491 | h5->rx_pending--; |
| 492 | |
Johan Hedberg | 255a68e | 2012-07-16 16:12:13 +0300 | [diff] [blame] | 493 | BT_DBG("unsliped 0x%02hhx, rx_pending %zu", *byte, h5->rx_pending); |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 494 | } |
| 495 | |
| 496 | static void h5_reset_rx(struct h5 *h5) |
| 497 | { |
| 498 | if (h5->rx_skb) { |
| 499 | kfree_skb(h5->rx_skb); |
| 500 | h5->rx_skb = NULL; |
| 501 | } |
| 502 | |
| 503 | h5->rx_func = h5_rx_delimiter; |
| 504 | h5->rx_pending = 0; |
Johan Hedberg | e048210 | 2012-07-16 16:12:19 +0300 | [diff] [blame] | 505 | clear_bit(H5_RX_ESC, &h5->flags); |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 506 | } |
| 507 | |
Marcel Holtmann | 9d1c40e | 2015-04-04 20:59:41 -0700 | [diff] [blame] | 508 | static int h5_recv(struct hci_uart *hu, const void *data, int count) |
Johan Hedberg | 7dec65c | 2012-07-16 16:12:02 +0300 | [diff] [blame] | 509 | { |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 510 | struct h5 *h5 = hu->priv; |
Marcel Holtmann | 9d1c40e | 2015-04-04 20:59:41 -0700 | [diff] [blame] | 511 | const unsigned char *ptr = data; |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 512 | |
Johan Hedberg | 255a68e | 2012-07-16 16:12:13 +0300 | [diff] [blame] | 513 | BT_DBG("%s pending %zu count %d", hu->hdev->name, h5->rx_pending, |
| 514 | count); |
Johan Hedberg | bc1f35b | 2012-07-16 16:12:05 +0300 | [diff] [blame] | 515 | |
| 516 | while (count > 0) { |
| 517 | int processed; |
| 518 | |
| 519 | if (h5->rx_pending > 0) { |
| 520 | if (*ptr == SLIP_DELIMITER) { |
| 521 | BT_ERR("Too short H5 packet"); |
| 522 | h5_reset_rx(h5); |
| 523 | continue; |
| 524 | } |
| 525 | |
| 526 | h5_unslip_one_byte(h5, *ptr); |
| 527 | |
| 528 | ptr++; count--; |
| 529 | continue; |
| 530 | } |
| 531 | |
| 532 | processed = h5->rx_func(hu, *ptr); |
| 533 | if (processed < 0) |
| 534 | return processed; |
| 535 | |
| 536 | ptr += processed; |
| 537 | count -= processed; |
| 538 | } |
| 539 | |
| 540 | return 0; |
Johan Hedberg | 7dec65c | 2012-07-16 16:12:02 +0300 | [diff] [blame] | 541 | } |
| 542 | |
| 543 | static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb) |
| 544 | { |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 545 | struct h5 *h5 = hu->priv; |
| 546 | |
| 547 | if (skb->len > 0xfff) { |
| 548 | BT_ERR("Packet too long (%u bytes)", skb->len); |
| 549 | kfree_skb(skb); |
| 550 | return 0; |
| 551 | } |
| 552 | |
Johan Hedberg | f674a05 | 2012-07-16 16:12:15 +0300 | [diff] [blame] | 553 | if (h5->state != H5_ACTIVE) { |
| 554 | BT_ERR("Ignoring HCI data in non-active state"); |
| 555 | kfree_skb(skb); |
| 556 | return 0; |
| 557 | } |
| 558 | |
Marcel Holtmann | 618e8bc | 2015-11-05 07:33:56 +0100 | [diff] [blame] | 559 | switch (hci_skb_pkt_type(skb)) { |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 560 | case HCI_ACLDATA_PKT: |
| 561 | case HCI_COMMAND_PKT: |
| 562 | skb_queue_tail(&h5->rel, skb); |
| 563 | break; |
| 564 | |
| 565 | case HCI_SCODATA_PKT: |
| 566 | skb_queue_tail(&h5->unrel, skb); |
| 567 | break; |
| 568 | |
| 569 | default: |
Marcel Holtmann | 618e8bc | 2015-11-05 07:33:56 +0100 | [diff] [blame] | 570 | BT_ERR("Unknown packet type %u", hci_skb_pkt_type(skb)); |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 571 | kfree_skb(skb); |
| 572 | break; |
| 573 | } |
| 574 | |
| 575 | return 0; |
| 576 | } |
| 577 | |
Johan Hedberg | c0a1b73 | 2012-07-16 16:12:06 +0300 | [diff] [blame] | 578 | static void h5_slip_delim(struct sk_buff *skb) |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 579 | { |
Johan Hedberg | c0a1b73 | 2012-07-16 16:12:06 +0300 | [diff] [blame] | 580 | const char delim = SLIP_DELIMITER; |
| 581 | |
| 582 | memcpy(skb_put(skb, 1), &delim, 1); |
| 583 | } |
| 584 | |
| 585 | static void h5_slip_one_byte(struct sk_buff *skb, u8 c) |
| 586 | { |
| 587 | const char esc_delim[2] = { SLIP_ESC, SLIP_ESC_DELIM }; |
| 588 | const char esc_esc[2] = { SLIP_ESC, SLIP_ESC_ESC }; |
| 589 | |
| 590 | switch (c) { |
| 591 | case SLIP_DELIMITER: |
| 592 | memcpy(skb_put(skb, 2), &esc_delim, 2); |
| 593 | break; |
| 594 | case SLIP_ESC: |
| 595 | memcpy(skb_put(skb, 2), &esc_esc, 2); |
| 596 | break; |
| 597 | default: |
| 598 | memcpy(skb_put(skb, 1), &c, 1); |
| 599 | } |
| 600 | } |
| 601 | |
Johan Hedberg | c826ed0 | 2012-07-16 16:12:17 +0300 | [diff] [blame] | 602 | static bool valid_packet_type(u8 type) |
| 603 | { |
| 604 | switch (type) { |
| 605 | case HCI_ACLDATA_PKT: |
| 606 | case HCI_COMMAND_PKT: |
| 607 | case HCI_SCODATA_PKT: |
| 608 | case HCI_3WIRE_LINK_PKT: |
| 609 | case HCI_3WIRE_ACK_PKT: |
| 610 | return true; |
| 611 | default: |
| 612 | return false; |
| 613 | } |
| 614 | } |
| 615 | |
| 616 | static struct sk_buff *h5_prepare_pkt(struct hci_uart *hu, u8 pkt_type, |
| 617 | const u8 *data, size_t len) |
Johan Hedberg | c0a1b73 | 2012-07-16 16:12:06 +0300 | [diff] [blame] | 618 | { |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 619 | struct h5 *h5 = hu->priv; |
Johan Hedberg | c0a1b73 | 2012-07-16 16:12:06 +0300 | [diff] [blame] | 620 | struct sk_buff *nskb; |
| 621 | u8 hdr[4]; |
| 622 | int i; |
| 623 | |
Johan Hedberg | c826ed0 | 2012-07-16 16:12:17 +0300 | [diff] [blame] | 624 | if (!valid_packet_type(pkt_type)) { |
| 625 | BT_ERR("Unknown packet type %u", pkt_type); |
| 626 | return NULL; |
| 627 | } |
| 628 | |
Johan Hedberg | c0a1b73 | 2012-07-16 16:12:06 +0300 | [diff] [blame] | 629 | /* |
| 630 | * Max len of packet: (original len + 4 (H5 hdr) + 2 (crc)) * 2 |
| 631 | * (because bytes 0xc0 and 0xdb are escaped, worst case is when |
| 632 | * the packet is all made of 0xc0 and 0xdb) + 2 (0xc0 |
| 633 | * delimiters at start and end). |
| 634 | */ |
| 635 | nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC); |
| 636 | if (!nskb) |
| 637 | return NULL; |
| 638 | |
Marcel Holtmann | 618e8bc | 2015-11-05 07:33:56 +0100 | [diff] [blame] | 639 | hci_skb_pkt_type(nskb) = pkt_type; |
Johan Hedberg | c0a1b73 | 2012-07-16 16:12:06 +0300 | [diff] [blame] | 640 | |
| 641 | h5_slip_delim(nskb); |
| 642 | |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 643 | hdr[0] = h5->tx_ack << 3; |
Johan Hedberg | e048210 | 2012-07-16 16:12:19 +0300 | [diff] [blame] | 644 | clear_bit(H5_TX_ACK_REQ, &h5->flags); |
Johan Hedberg | c0a1b73 | 2012-07-16 16:12:06 +0300 | [diff] [blame] | 645 | |
Johan Hedberg | c826ed0 | 2012-07-16 16:12:17 +0300 | [diff] [blame] | 646 | /* Reliable packet? */ |
| 647 | if (pkt_type == HCI_ACLDATA_PKT || pkt_type == HCI_COMMAND_PKT) { |
Johan Hedberg | c0a1b73 | 2012-07-16 16:12:06 +0300 | [diff] [blame] | 648 | hdr[0] |= 1 << 7; |
Johan Hedberg | 43eb12d | 2012-07-16 16:12:08 +0300 | [diff] [blame] | 649 | hdr[0] |= h5->tx_seq; |
| 650 | h5->tx_seq = (h5->tx_seq + 1) % 8; |
Johan Hedberg | c0a1b73 | 2012-07-16 16:12:06 +0300 | [diff] [blame] | 651 | } |
| 652 | |
| 653 | hdr[1] = pkt_type | ((len & 0x0f) << 4); |
| 654 | hdr[2] = len >> 4; |
| 655 | hdr[3] = ~((hdr[0] + hdr[1] + hdr[2]) & 0xff); |
| 656 | |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 657 | BT_DBG("%s tx: seq %u ack %u crc %u rel %u type %u len %u", |
| 658 | hu->hdev->name, H5_HDR_SEQ(hdr), H5_HDR_ACK(hdr), |
| 659 | H5_HDR_CRC(hdr), H5_HDR_RELIABLE(hdr), H5_HDR_PKT_TYPE(hdr), |
| 660 | H5_HDR_LEN(hdr)); |
| 661 | |
Johan Hedberg | c0a1b73 | 2012-07-16 16:12:06 +0300 | [diff] [blame] | 662 | for (i = 0; i < 4; i++) |
| 663 | h5_slip_one_byte(nskb, hdr[i]); |
| 664 | |
| 665 | for (i = 0; i < len; i++) |
| 666 | h5_slip_one_byte(nskb, data[i]); |
| 667 | |
| 668 | h5_slip_delim(nskb); |
| 669 | |
| 670 | return nskb; |
| 671 | } |
| 672 | |
Johan Hedberg | 7dec65c | 2012-07-16 16:12:02 +0300 | [diff] [blame] | 673 | static struct sk_buff *h5_dequeue(struct hci_uart *hu) |
| 674 | { |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 675 | struct h5 *h5 = hu->priv; |
Johan Hedberg | 3f27e95 | 2012-07-16 16:12:04 +0300 | [diff] [blame] | 676 | unsigned long flags; |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 677 | struct sk_buff *skb, *nskb; |
| 678 | |
Johan Hedberg | 95c5c22 | 2012-07-16 16:12:16 +0300 | [diff] [blame] | 679 | if (h5->sleep != H5_AWAKE) { |
| 680 | const unsigned char wakeup_req[] = { 0x05, 0xfa }; |
| 681 | |
| 682 | if (h5->sleep == H5_WAKING_UP) |
| 683 | return NULL; |
| 684 | |
| 685 | h5->sleep = H5_WAKING_UP; |
| 686 | BT_DBG("Sending wakeup request"); |
| 687 | |
| 688 | mod_timer(&h5->timer, jiffies + HZ / 100); |
| 689 | return h5_prepare_pkt(hu, HCI_3WIRE_LINK_PKT, wakeup_req, 2); |
| 690 | } |
| 691 | |
Valentin Ilie | a08b15e | 2013-08-12 18:46:00 +0300 | [diff] [blame] | 692 | skb = skb_dequeue(&h5->unrel); |
Prasanna Karthik | 4a2fa2b | 2015-09-30 13:02:05 +0000 | [diff] [blame] | 693 | if (skb) { |
Marcel Holtmann | 618e8bc | 2015-11-05 07:33:56 +0100 | [diff] [blame] | 694 | nskb = h5_prepare_pkt(hu, hci_skb_pkt_type(skb), |
Johan Hedberg | c0a1b73 | 2012-07-16 16:12:06 +0300 | [diff] [blame] | 695 | skb->data, skb->len); |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 696 | if (nskb) { |
| 697 | kfree_skb(skb); |
| 698 | return nskb; |
| 699 | } |
| 700 | |
| 701 | skb_queue_head(&h5->unrel, skb); |
| 702 | BT_ERR("Could not dequeue pkt because alloc_skb failed"); |
| 703 | } |
| 704 | |
Johan Hedberg | 3f27e95 | 2012-07-16 16:12:04 +0300 | [diff] [blame] | 705 | spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING); |
| 706 | |
Johan Hedberg | afdc944 | 2012-07-16 16:12:18 +0300 | [diff] [blame] | 707 | if (h5->unack.qlen >= h5->tx_win) |
Johan Hedberg | 3f27e95 | 2012-07-16 16:12:04 +0300 | [diff] [blame] | 708 | goto unlock; |
| 709 | |
Valentin Ilie | a08b15e | 2013-08-12 18:46:00 +0300 | [diff] [blame] | 710 | skb = skb_dequeue(&h5->rel); |
Prasanna Karthik | 4a2fa2b | 2015-09-30 13:02:05 +0000 | [diff] [blame] | 711 | if (skb) { |
Marcel Holtmann | 618e8bc | 2015-11-05 07:33:56 +0100 | [diff] [blame] | 712 | nskb = h5_prepare_pkt(hu, hci_skb_pkt_type(skb), |
Johan Hedberg | c0a1b73 | 2012-07-16 16:12:06 +0300 | [diff] [blame] | 713 | skb->data, skb->len); |
Johan Hedberg | 3f27e95 | 2012-07-16 16:12:04 +0300 | [diff] [blame] | 714 | if (nskb) { |
| 715 | __skb_queue_tail(&h5->unack, skb); |
| 716 | mod_timer(&h5->timer, jiffies + H5_ACK_TIMEOUT); |
| 717 | spin_unlock_irqrestore(&h5->unack.lock, flags); |
| 718 | return nskb; |
| 719 | } |
| 720 | |
| 721 | skb_queue_head(&h5->rel, skb); |
| 722 | BT_ERR("Could not dequeue pkt because alloc_skb failed"); |
| 723 | } |
| 724 | |
| 725 | unlock: |
| 726 | spin_unlock_irqrestore(&h5->unack.lock, flags); |
| 727 | |
Johan Hedberg | e048210 | 2012-07-16 16:12:19 +0300 | [diff] [blame] | 728 | if (test_bit(H5_TX_ACK_REQ, &h5->flags)) |
Johan Hedberg | 40f1022 | 2012-07-16 16:12:09 +0300 | [diff] [blame] | 729 | return h5_prepare_pkt(hu, HCI_3WIRE_ACK_PKT, NULL, 0); |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 730 | |
Johan Hedberg | 7dec65c | 2012-07-16 16:12:02 +0300 | [diff] [blame] | 731 | return NULL; |
| 732 | } |
| 733 | |
| 734 | static int h5_flush(struct hci_uart *hu) |
| 735 | { |
Johan Hedberg | 7d664fb | 2012-07-16 16:12:03 +0300 | [diff] [blame] | 736 | BT_DBG("hu %p", hu); |
| 737 | return 0; |
Johan Hedberg | 7dec65c | 2012-07-16 16:12:02 +0300 | [diff] [blame] | 738 | } |
| 739 | |
Marcel Holtmann | 4ee7ef1 | 2015-04-04 22:11:43 -0700 | [diff] [blame] | 740 | static const struct hci_uart_proto h5p = { |
Johan Hedberg | 7dec65c | 2012-07-16 16:12:02 +0300 | [diff] [blame] | 741 | .id = HCI_UART_3WIRE, |
Marcel Holtmann | 7c40fb8 | 2015-04-04 22:27:34 -0700 | [diff] [blame] | 742 | .name = "Three-wire (H5)", |
Johan Hedberg | 7dec65c | 2012-07-16 16:12:02 +0300 | [diff] [blame] | 743 | .open = h5_open, |
| 744 | .close = h5_close, |
| 745 | .recv = h5_recv, |
| 746 | .enqueue = h5_enqueue, |
| 747 | .dequeue = h5_dequeue, |
| 748 | .flush = h5_flush, |
| 749 | }; |
| 750 | |
| 751 | int __init h5_init(void) |
| 752 | { |
Marcel Holtmann | 01009ee | 2015-04-04 22:27:35 -0700 | [diff] [blame] | 753 | return hci_uart_register_proto(&h5p); |
Johan Hedberg | 7dec65c | 2012-07-16 16:12:02 +0300 | [diff] [blame] | 754 | } |
| 755 | |
| 756 | int __exit h5_deinit(void) |
| 757 | { |
| 758 | return hci_uart_unregister_proto(&h5p); |
| 759 | } |