1 /* 2 * Atheros Communication Bluetooth HCIATH3K UART protocol 3 * 4 * HCIATH3K (HCI Atheros AR300x Protocol) is a Atheros Communication's 5 * power management protocol extension to H4 to support AR300x Bluetooth Chip. 6 * 7 * Copyright (c) 2009-2010 Atheros Communications Inc. 8 * 9 * Acknowledgements: 10 * This file is based on hci_h4.c, which was written 11 * by Maxim Krasnyansky and Marcel Holtmann. 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 as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 26 * 27 */ 28 29 #include <linux/module.h> 30 #include <linux/kernel.h> 31 32 #include <linux/init.h> 33 #include <linux/slab.h> 34 #include <linux/tty.h> 35 #include <linux/errno.h> 36 #include <linux/ioctl.h> 37 #include <linux/skbuff.h> 38 39 #include <net/bluetooth/bluetooth.h> 40 #include <net/bluetooth/hci_core.h> 41 42 #include "hci_uart.h" 43 44 struct ath_struct { 45 struct hci_uart *hu; 46 unsigned int cur_sleep; 47 48 struct sk_buff_head txq; 49 struct work_struct ctxtsw; 50 }; 51 52 static int ath_wakeup_ar3k(struct tty_struct *tty) 53 { 54 struct ktermios ktermios; 55 int status = tty->driver->ops->tiocmget(tty); 56 57 if (status & TIOCM_CTS) 58 return status; 59 60 /* Disable Automatic RTSCTS */ 61 ktermios = tty->termios; 62 ktermios.c_cflag &= ~CRTSCTS; 63 tty_set_termios(tty, &ktermios); 64 65 /* Clear RTS first */ 66 status = tty->driver->ops->tiocmget(tty); 67 tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS); 68 mdelay(20); 69 70 /* Set RTS, wake up board */ 71 status = tty->driver->ops->tiocmget(tty); 72 tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00); 73 mdelay(20); 74 75 status = tty->driver->ops->tiocmget(tty); 76 77 /* Disable Automatic RTSCTS */ 78 ktermios.c_cflag |= CRTSCTS; 79 status = tty_set_termios(tty, &ktermios); 80 81 return status; 82 } 83 84 static void ath_hci_uart_work(struct work_struct *work) 85 { 86 int status; 87 struct ath_struct *ath; 88 struct hci_uart *hu; 89 struct tty_struct *tty; 90 91 ath = container_of(work, struct ath_struct, ctxtsw); 92 93 hu = ath->hu; 94 tty = hu->tty; 95 96 /* verify and wake up controller */ 97 if (ath->cur_sleep) { 98 status = ath_wakeup_ar3k(tty); 99 if (!(status & TIOCM_CTS)) 100 return; 101 } 102 103 /* Ready to send Data */ 104 clear_bit(HCI_UART_SENDING, &hu->tx_state); 105 hci_uart_tx_wakeup(hu); 106 } 107 108 /* Initialize protocol */ 109 static int ath_open(struct hci_uart *hu) 110 { 111 struct ath_struct *ath; 112 113 BT_DBG("hu %p", hu); 114 115 ath = kzalloc(sizeof(*ath), GFP_KERNEL); 116 if (!ath) 117 return -ENOMEM; 118 119 skb_queue_head_init(&ath->txq); 120 121 hu->priv = ath; 122 ath->hu = hu; 123 124 INIT_WORK(&ath->ctxtsw, ath_hci_uart_work); 125 126 return 0; 127 } 128 129 /* Flush protocol data */ 130 static int ath_flush(struct hci_uart *hu) 131 { 132 struct ath_struct *ath = hu->priv; 133 134 BT_DBG("hu %p", hu); 135 136 skb_queue_purge(&ath->txq); 137 138 return 0; 139 } 140 141 /* Close protocol */ 142 static int ath_close(struct hci_uart *hu) 143 { 144 struct ath_struct *ath = hu->priv; 145 146 BT_DBG("hu %p", hu); 147 148 skb_queue_purge(&ath->txq); 149 150 cancel_work_sync(&ath->ctxtsw); 151 152 hu->priv = NULL; 153 kfree(ath); 154 155 return 0; 156 } 157 158 #define HCI_OP_ATH_SLEEP 0xFC04 159 160 /* Enqueue frame for transmittion */ 161 static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb) 162 { 163 struct ath_struct *ath = hu->priv; 164 165 if (bt_cb(skb)->pkt_type == HCI_SCODATA_PKT) { 166 kfree_skb(skb); 167 return 0; 168 } 169 170 /* 171 * Update power management enable flag with parameters of 172 * HCI sleep enable vendor specific HCI command. 173 */ 174 if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) { 175 struct hci_command_hdr *hdr = (void *)skb->data; 176 177 if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP) 178 ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE]; 179 } 180 181 BT_DBG("hu %p skb %p", hu, skb); 182 183 /* Prepend skb with frame type */ 184 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); 185 186 skb_queue_tail(&ath->txq, skb); 187 set_bit(HCI_UART_SENDING, &hu->tx_state); 188 189 schedule_work(&ath->ctxtsw); 190 191 return 0; 192 } 193 194 static struct sk_buff *ath_dequeue(struct hci_uart *hu) 195 { 196 struct ath_struct *ath = hu->priv; 197 198 return skb_dequeue(&ath->txq); 199 } 200 201 /* Recv data */ 202 static int ath_recv(struct hci_uart *hu, void *data, int count) 203 { 204 int ret; 205 206 ret = hci_recv_stream_fragment(hu->hdev, data, count); 207 if (ret < 0) { 208 BT_ERR("Frame Reassembly Failed"); 209 return ret; 210 } 211 212 return count; 213 } 214 215 static struct hci_uart_proto athp = { 216 .id = HCI_UART_ATH3K, 217 .open = ath_open, 218 .close = ath_close, 219 .recv = ath_recv, 220 .enqueue = ath_enqueue, 221 .dequeue = ath_dequeue, 222 .flush = ath_flush, 223 }; 224 225 int __init ath_init(void) 226 { 227 int err = hci_uart_register_proto(&athp); 228 229 if (!err) 230 BT_INFO("HCIATH3K protocol initialized"); 231 else 232 BT_ERR("HCIATH3K protocol registration failed"); 233 234 return err; 235 } 236 237 int __exit ath_deinit(void) 238 { 239 return hci_uart_unregister_proto(&athp); 240 } 241