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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 termios settings; |
55 | int status = tty->driver->ops->tiocmget(tty, NULL); |
56 | |
57 | if (status & TIOCM_CTS) |
58 | return status; |
59 | |
60 | /* Disable Automatic RTSCTS */ |
61 | n_tty_ioctl_helper(tty, NULL, TCGETS, (unsigned long)&settings); |
62 | settings.c_cflag &= ~CRTSCTS; |
63 | n_tty_ioctl_helper(tty, NULL, TCSETS, (unsigned long)&settings); |
64 | |
65 | /* Clear RTS first */ |
66 | status = tty->driver->ops->tiocmget(tty, NULL); |
67 | tty->driver->ops->tiocmset(tty, NULL, 0x00, TIOCM_RTS); |
68 | mdelay(20); |
69 | |
70 | /* Set RTS, wake up board */ |
71 | status = tty->driver->ops->tiocmget(tty, NULL); |
72 | tty->driver->ops->tiocmset(tty, NULL, TIOCM_RTS, 0x00); |
73 | mdelay(20); |
74 | |
75 | status = tty->driver->ops->tiocmget(tty, NULL); |
76 | |
77 | n_tty_ioctl_helper(tty, NULL, TCGETS, (unsigned long)&settings); |
78 | settings.c_cflag |= CRTSCTS; |
79 | n_tty_ioctl_helper(tty, NULL, TCSETS, (unsigned long)&settings); |
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_ATOMIC); |
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 | if (hci_recv_stream_fragment(hu->hdev, data, count) < 0) |
205 | BT_ERR("Frame Reassembly Failed"); |
206 | |
207 | return count; |
208 | } |
209 | |
210 | static struct hci_uart_proto athp = { |
211 | .id = HCI_UART_ATH3K, |
212 | .open = ath_open, |
213 | .close = ath_close, |
214 | .recv = ath_recv, |
215 | .enqueue = ath_enqueue, |
216 | .dequeue = ath_dequeue, |
217 | .flush = ath_flush, |
218 | }; |
219 | |
220 | int __init ath_init(void) |
221 | { |
222 | int err = hci_uart_register_proto(&athp); |
223 | |
224 | if (!err) |
225 | BT_INFO("HCIATH3K protocol initialized"); |
226 | else |
227 | BT_ERR("HCIATH3K protocol registration failed"); |
228 | |
229 | return err; |
230 | } |
231 | |
232 | int __exit ath_deinit(void) |
233 | { |
234 | return hci_uart_unregister_proto(&athp); |
235 | } |
236 |
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