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 *rx_skb; 49 struct sk_buff_head txq; 50 struct work_struct ctxtsw; 51 }; 52 53 static int ath_wakeup_ar3k(struct tty_struct *tty) 54 { 55 int status = tty->driver->ops->tiocmget(tty); 56 57 if (status & TIOCM_CTS) 58 return status; 59 60 /* Clear RTS first */ 61 tty->driver->ops->tiocmget(tty); 62 tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS); 63 mdelay(20); 64 65 /* Set RTS, wake up board */ 66 tty->driver->ops->tiocmget(tty); 67 tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00); 68 mdelay(20); 69 70 status = tty->driver->ops->tiocmget(tty); 71 return status; 72 } 73 74 static void ath_hci_uart_work(struct work_struct *work) 75 { 76 int status; 77 struct ath_struct *ath; 78 struct hci_uart *hu; 79 struct tty_struct *tty; 80 81 ath = container_of(work, struct ath_struct, ctxtsw); 82 83 hu = ath->hu; 84 tty = hu->tty; 85 86 /* verify and wake up controller */ 87 if (ath->cur_sleep) { 88 status = ath_wakeup_ar3k(tty); 89 if (!(status & TIOCM_CTS)) 90 return; 91 } 92 93 /* Ready to send Data */ 94 clear_bit(HCI_UART_SENDING, &hu->tx_state); 95 hci_uart_tx_wakeup(hu); 96 } 97 98 /* Initialize protocol */ 99 static int ath_open(struct hci_uart *hu) 100 { 101 struct ath_struct *ath; 102 103 BT_DBG("hu %p", hu); 104 105 ath = kzalloc(sizeof(*ath), GFP_KERNEL); 106 if (!ath) 107 return -ENOMEM; 108 109 skb_queue_head_init(&ath->txq); 110 111 hu->priv = ath; 112 ath->hu = hu; 113 114 INIT_WORK(&ath->ctxtsw, ath_hci_uart_work); 115 116 return 0; 117 } 118 119 /* Flush protocol data */ 120 static int ath_flush(struct hci_uart *hu) 121 { 122 struct ath_struct *ath = hu->priv; 123 124 BT_DBG("hu %p", hu); 125 126 skb_queue_purge(&ath->txq); 127 128 return 0; 129 } 130 131 /* Close protocol */ 132 static int ath_close(struct hci_uart *hu) 133 { 134 struct ath_struct *ath = hu->priv; 135 136 BT_DBG("hu %p", hu); 137 138 skb_queue_purge(&ath->txq); 139 140 kfree_skb(ath->rx_skb); 141 142 cancel_work_sync(&ath->ctxtsw); 143 144 hu->priv = NULL; 145 kfree(ath); 146 147 return 0; 148 } 149 150 #define HCI_OP_ATH_SLEEP 0xFC04 151 152 /* Enqueue frame for transmittion */ 153 static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb) 154 { 155 struct ath_struct *ath = hu->priv; 156 157 if (bt_cb(skb)->pkt_type == HCI_SCODATA_PKT) { 158 kfree_skb(skb); 159 return 0; 160 } 161 162 /* 163 * Update power management enable flag with parameters of 164 * HCI sleep enable vendor specific HCI command. 165 */ 166 if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) { 167 struct hci_command_hdr *hdr = (void *)skb->data; 168 169 if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP) 170 ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE]; 171 } 172 173 BT_DBG("hu %p skb %p", hu, skb); 174 175 /* Prepend skb with frame type */ 176 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); 177 178 skb_queue_tail(&ath->txq, skb); 179 set_bit(HCI_UART_SENDING, &hu->tx_state); 180 181 schedule_work(&ath->ctxtsw); 182 183 return 0; 184 } 185 186 static struct sk_buff *ath_dequeue(struct hci_uart *hu) 187 { 188 struct ath_struct *ath = hu->priv; 189 190 return skb_dequeue(&ath->txq); 191 } 192 193 /* Recv data */ 194 static int ath_recv(struct hci_uart *hu, const void *data, int count) 195 { 196 struct ath_struct *ath = hu->priv; 197 198 ath->rx_skb = h4_recv_buf(hu->hdev, ath->rx_skb, data, count); 199 if (IS_ERR(ath->rx_skb)) { 200 int err = PTR_ERR(ath->rx_skb); 201 BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err); 202 return err; 203 } 204 205 return count; 206 } 207 208 static const struct hci_uart_proto athp = { 209 .id = HCI_UART_ATH3K, 210 .name = "ATH3K", 211 .open = ath_open, 212 .close = ath_close, 213 .recv = ath_recv, 214 .enqueue = ath_enqueue, 215 .dequeue = ath_dequeue, 216 .flush = ath_flush, 217 }; 218 219 int __init ath_init(void) 220 { 221 return hci_uart_register_proto(&athp); 222 } 223 224 int __exit ath_deinit(void) 225 { 226 return hci_uart_unregister_proto(&athp); 227 } 228