xref: /openbmc/linux/drivers/bluetooth/hci_ath.c (revision a2cce7a9)
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 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 static int ath_close(struct hci_uart *hu)
119 {
120 	struct ath_struct *ath = hu->priv;
121 
122 	BT_DBG("hu %p", hu);
123 
124 	skb_queue_purge(&ath->txq);
125 
126 	kfree_skb(ath->rx_skb);
127 
128 	cancel_work_sync(&ath->ctxtsw);
129 
130 	hu->priv = NULL;
131 	kfree(ath);
132 
133 	return 0;
134 }
135 
136 static int ath_flush(struct hci_uart *hu)
137 {
138 	struct ath_struct *ath = hu->priv;
139 
140 	BT_DBG("hu %p", hu);
141 
142 	skb_queue_purge(&ath->txq);
143 
144 	return 0;
145 }
146 
147 static int ath_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
148 {
149 	struct sk_buff *skb;
150 	u8 buf[10];
151 	int err;
152 
153 	buf[0] = 0x01;
154 	buf[1] = 0x01;
155 	buf[2] = 0x00;
156 	buf[3] = sizeof(bdaddr_t);
157 	memcpy(buf + 4, bdaddr, sizeof(bdaddr_t));
158 
159 	skb = __hci_cmd_sync(hdev, 0xfc0b, sizeof(buf), buf, HCI_INIT_TIMEOUT);
160 	if (IS_ERR(skb)) {
161 		err = PTR_ERR(skb);
162 		BT_ERR("%s: Change address command failed (%d)",
163 		       hdev->name, err);
164 		return err;
165 	}
166 	kfree_skb(skb);
167 
168 	return 0;
169 }
170 
171 static int ath_setup(struct hci_uart *hu)
172 {
173 	BT_DBG("hu %p", hu);
174 
175 	hu->hdev->set_bdaddr = ath_set_bdaddr;
176 
177 	return 0;
178 }
179 
180 static const struct h4_recv_pkt ath_recv_pkts[] = {
181 	{ H4_RECV_ACL,   .recv = hci_recv_frame },
182 	{ H4_RECV_SCO,   .recv = hci_recv_frame },
183 	{ H4_RECV_EVENT, .recv = hci_recv_frame },
184 };
185 
186 static int ath_recv(struct hci_uart *hu, const void *data, int count)
187 {
188 	struct ath_struct *ath = hu->priv;
189 
190 	ath->rx_skb = h4_recv_buf(hu->hdev, ath->rx_skb, data, count,
191 				  ath_recv_pkts, ARRAY_SIZE(ath_recv_pkts));
192 	if (IS_ERR(ath->rx_skb)) {
193 		int err = PTR_ERR(ath->rx_skb);
194 		BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
195 		ath->rx_skb = NULL;
196 		return err;
197 	}
198 
199 	return count;
200 }
201 
202 #define HCI_OP_ATH_SLEEP 0xFC04
203 
204 static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb)
205 {
206 	struct ath_struct *ath = hu->priv;
207 
208 	if (bt_cb(skb)->pkt_type == HCI_SCODATA_PKT) {
209 		kfree_skb(skb);
210 		return 0;
211 	}
212 
213 	/* Update power management enable flag with parameters of
214 	 * HCI sleep enable vendor specific HCI command.
215 	 */
216 	if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
217 		struct hci_command_hdr *hdr = (void *)skb->data;
218 
219 		if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP)
220 			ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE];
221 	}
222 
223 	BT_DBG("hu %p skb %p", hu, skb);
224 
225 	/* Prepend skb with frame type */
226 	memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
227 
228 	skb_queue_tail(&ath->txq, skb);
229 	set_bit(HCI_UART_SENDING, &hu->tx_state);
230 
231 	schedule_work(&ath->ctxtsw);
232 
233 	return 0;
234 }
235 
236 static struct sk_buff *ath_dequeue(struct hci_uart *hu)
237 {
238 	struct ath_struct *ath = hu->priv;
239 
240 	return skb_dequeue(&ath->txq);
241 }
242 
243 static const struct hci_uart_proto athp = {
244 	.id		= HCI_UART_ATH3K,
245 	.name		= "ATH3K",
246 	.open		= ath_open,
247 	.close		= ath_close,
248 	.flush		= ath_flush,
249 	.setup		= ath_setup,
250 	.recv		= ath_recv,
251 	.enqueue	= ath_enqueue,
252 	.dequeue	= ath_dequeue,
253 };
254 
255 int __init ath_init(void)
256 {
257 	return hci_uart_register_proto(&athp);
258 }
259 
260 int __exit ath_deinit(void)
261 {
262 	return hci_uart_unregister_proto(&athp);
263 }
264