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 int status = tty->driver->ops->tiocmget(tty); 55 56 if (status & TIOCM_CTS) 57 return status; 58 59 /* Clear RTS first */ 60 tty->driver->ops->tiocmget(tty); 61 tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS); 62 mdelay(20); 63 64 /* Set RTS, wake up board */ 65 tty->driver->ops->tiocmget(tty); 66 tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00); 67 mdelay(20); 68 69 status = tty->driver->ops->tiocmget(tty); 70 return status; 71 } 72 73 static void ath_hci_uart_work(struct work_struct *work) 74 { 75 int status; 76 struct ath_struct *ath; 77 struct hci_uart *hu; 78 struct tty_struct *tty; 79 80 ath = container_of(work, struct ath_struct, ctxtsw); 81 82 hu = ath->hu; 83 tty = hu->tty; 84 85 /* verify and wake up controller */ 86 if (ath->cur_sleep) { 87 status = ath_wakeup_ar3k(tty); 88 if (!(status & TIOCM_CTS)) 89 return; 90 } 91 92 /* Ready to send Data */ 93 clear_bit(HCI_UART_SENDING, &hu->tx_state); 94 hci_uart_tx_wakeup(hu); 95 } 96 97 /* Initialize protocol */ 98 static int ath_open(struct hci_uart *hu) 99 { 100 struct ath_struct *ath; 101 102 BT_DBG("hu %p", hu); 103 104 ath = kzalloc(sizeof(*ath), GFP_KERNEL); 105 if (!ath) 106 return -ENOMEM; 107 108 skb_queue_head_init(&ath->txq); 109 110 hu->priv = ath; 111 ath->hu = hu; 112 113 INIT_WORK(&ath->ctxtsw, ath_hci_uart_work); 114 115 return 0; 116 } 117 118 /* Flush protocol data */ 119 static int ath_flush(struct hci_uart *hu) 120 { 121 struct ath_struct *ath = hu->priv; 122 123 BT_DBG("hu %p", hu); 124 125 skb_queue_purge(&ath->txq); 126 127 return 0; 128 } 129 130 /* Close protocol */ 131 static int ath_close(struct hci_uart *hu) 132 { 133 struct ath_struct *ath = hu->priv; 134 135 BT_DBG("hu %p", hu); 136 137 skb_queue_purge(&ath->txq); 138 139 cancel_work_sync(&ath->ctxtsw); 140 141 hu->priv = NULL; 142 kfree(ath); 143 144 return 0; 145 } 146 147 #define HCI_OP_ATH_SLEEP 0xFC04 148 149 /* Enqueue frame for transmittion */ 150 static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb) 151 { 152 struct ath_struct *ath = hu->priv; 153 154 if (bt_cb(skb)->pkt_type == HCI_SCODATA_PKT) { 155 kfree_skb(skb); 156 return 0; 157 } 158 159 /* 160 * Update power management enable flag with parameters of 161 * HCI sleep enable vendor specific HCI command. 162 */ 163 if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) { 164 struct hci_command_hdr *hdr = (void *)skb->data; 165 166 if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP) 167 ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE]; 168 } 169 170 BT_DBG("hu %p skb %p", hu, skb); 171 172 /* Prepend skb with frame type */ 173 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); 174 175 skb_queue_tail(&ath->txq, skb); 176 set_bit(HCI_UART_SENDING, &hu->tx_state); 177 178 schedule_work(&ath->ctxtsw); 179 180 return 0; 181 } 182 183 static struct sk_buff *ath_dequeue(struct hci_uart *hu) 184 { 185 struct ath_struct *ath = hu->priv; 186 187 return skb_dequeue(&ath->txq); 188 } 189 190 /* Recv data */ 191 static int ath_recv(struct hci_uart *hu, const void *data, int count) 192 { 193 int ret; 194 195 ret = hci_recv_stream_fragment(hu->hdev, data, count); 196 if (ret < 0) { 197 BT_ERR("Frame Reassembly Failed"); 198 return ret; 199 } 200 201 return count; 202 } 203 204 static struct hci_uart_proto athp = { 205 .id = HCI_UART_ATH3K, 206 .open = ath_open, 207 .close = ath_close, 208 .recv = ath_recv, 209 .enqueue = ath_enqueue, 210 .dequeue = ath_dequeue, 211 .flush = ath_flush, 212 }; 213 214 int __init ath_init(void) 215 { 216 int err = hci_uart_register_proto(&athp); 217 218 if (!err) 219 BT_INFO("HCIATH3K protocol initialized"); 220 else 221 BT_ERR("HCIATH3K protocol registration failed"); 222 223 return err; 224 } 225 226 int __exit ath_deinit(void) 227 { 228 return hci_uart_unregister_proto(&athp); 229 } 230