2 * Atheros Communication Bluetooth HCIATH3K UART protocol
4 * HCIATH3K (HCI Atheros AR300x Protocol) is a Atheros Communication's
5 * power management protocol extension to H4 to support AR300x Bluetooth Chip.
7 * Copyright (c) 2009-2010 Atheros Communications Inc.
10 * This file is based on hci_h4.c, which was written
11 * by Maxim Krasnyansky and Marcel Holtmann.
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.
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.
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
29 #include <linux/module.h>
30 #include <linux/kernel.h>
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>
39 #include <net/bluetooth/bluetooth.h>
40 #include <net/bluetooth/hci_core.h>
46 unsigned int cur_sleep;
48 struct sk_buff_head txq;
49 struct work_struct ctxtsw;
52 static int ath_wakeup_ar3k(struct tty_struct *tty)
54 int status = tty->driver->ops->tiocmget(tty);
56 if (status & TIOCM_CTS)
60 tty->driver->ops->tiocmget(tty);
61 tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS);
64 /* Set RTS, wake up board */
65 tty->driver->ops->tiocmget(tty);
66 tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00);
69 status = tty->driver->ops->tiocmget(tty);
73 static void ath_hci_uart_work(struct work_struct *work)
76 struct ath_struct *ath;
78 struct tty_struct *tty;
80 ath = container_of(work, struct ath_struct, ctxtsw);
85 /* verify and wake up controller */
87 status = ath_wakeup_ar3k(tty);
88 if (!(status & TIOCM_CTS))
92 /* Ready to send Data */
93 clear_bit(HCI_UART_SENDING, &hu->tx_state);
94 hci_uart_tx_wakeup(hu);
97 /* Initialize protocol */
98 static int ath_open(struct hci_uart *hu)
100 struct ath_struct *ath;
104 ath = kzalloc(sizeof(*ath), GFP_KERNEL);
108 skb_queue_head_init(&ath->txq);
113 INIT_WORK(&ath->ctxtsw, ath_hci_uart_work);
118 /* Flush protocol data */
119 static int ath_flush(struct hci_uart *hu)
121 struct ath_struct *ath = hu->priv;
125 skb_queue_purge(&ath->txq);
131 static int ath_close(struct hci_uart *hu)
133 struct ath_struct *ath = hu->priv;
137 skb_queue_purge(&ath->txq);
139 cancel_work_sync(&ath->ctxtsw);
147 #define HCI_OP_ATH_SLEEP 0xFC04
149 /* Enqueue frame for transmittion */
150 static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb)
152 struct ath_struct *ath = hu->priv;
154 if (bt_cb(skb)->pkt_type == HCI_SCODATA_PKT) {
160 * Update power management enable flag with parameters of
161 * HCI sleep enable vendor specific HCI command.
163 if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
164 struct hci_command_hdr *hdr = (void *)skb->data;
166 if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP)
167 ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE];
170 BT_DBG("hu %p skb %p", hu, skb);
172 /* Prepend skb with frame type */
173 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
175 skb_queue_tail(&ath->txq, skb);
176 set_bit(HCI_UART_SENDING, &hu->tx_state);
178 schedule_work(&ath->ctxtsw);
183 static struct sk_buff *ath_dequeue(struct hci_uart *hu)
185 struct ath_struct *ath = hu->priv;
187 return skb_dequeue(&ath->txq);
191 static int ath_recv(struct hci_uart *hu, void *data, int count)
195 ret = hci_recv_stream_fragment(hu->hdev, data, count);
197 BT_ERR("Frame Reassembly Failed");
204 static struct hci_uart_proto athp = {
205 .id = HCI_UART_ATH3K,
209 .enqueue = ath_enqueue,
210 .dequeue = ath_dequeue,
214 int __init ath_init(void)
216 int err = hci_uart_register_proto(&athp);
219 BT_INFO("HCIATH3K protocol initialized");
221 BT_ERR("HCIATH3K protocol registration failed");
226 int __exit ath_deinit(void)
228 return hci_uart_unregister_proto(&athp);