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b3190df6 SS |
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 | { | |
afaae084 AC |
54 | struct ktermios ktermios; |
55 | int status = tty->driver->ops->tiocmget(tty); | |
b3190df6 SS |
56 | |
57 | if (status & TIOCM_CTS) | |
58 | return status; | |
59 | ||
60 | /* Disable Automatic RTSCTS */ | |
afaae084 AC |
61 | memcpy(&ktermios, tty->termios, sizeof(ktermios)); |
62 | ktermios.c_cflag &= ~CRTSCTS; | |
63 | tty_set_termios(tty, &ktermios); | |
b3190df6 SS |
64 | |
65 | /* Clear RTS first */ | |
afaae084 AC |
66 | status = tty->driver->ops->tiocmget(tty); |
67 | tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS); | |
b3190df6 SS |
68 | mdelay(20); |
69 | ||
70 | /* Set RTS, wake up board */ | |
afaae084 AC |
71 | status = tty->driver->ops->tiocmget(tty); |
72 | tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00); | |
b3190df6 SS |
73 | mdelay(20); |
74 | ||
afaae084 | 75 | status = tty->driver->ops->tiocmget(tty); |
b3190df6 | 76 | |
afaae084 AC |
77 | /* Disable Automatic RTSCTS */ |
78 | ktermios.c_cflag |= CRTSCTS; | |
79 | status = tty_set_termios(tty, &ktermios); | |
b3190df6 SS |
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) { | |
4ebaa4ed | 166 | kfree_skb(skb); |
b3190df6 SS |
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 | { | |
78b4a56c JZ |
204 | int ret; |
205 | ||
206 | ret = hci_recv_stream_fragment(hu->hdev, data, count); | |
207 | if (ret < 0) { | |
b3190df6 | 208 | BT_ERR("Frame Reassembly Failed"); |
78b4a56c JZ |
209 | return ret; |
210 | } | |
b3190df6 SS |
211 | |
212 | return count; | |
213 | } | |
214 | ||
215 | static struct hci_uart_proto athp = { | |
216 | .id = HCI_UART_ATH3K, | |
217 | .open = ath_open, | |
218 | .close = ath_close, | |
219 | .recv = ath_recv, | |
220 | .enqueue = ath_enqueue, | |
221 | .dequeue = ath_dequeue, | |
222 | .flush = ath_flush, | |
223 | }; | |
224 | ||
f2b94bb9 | 225 | int __init ath_init(void) |
b3190df6 SS |
226 | { |
227 | int err = hci_uart_register_proto(&athp); | |
228 | ||
229 | if (!err) | |
230 | BT_INFO("HCIATH3K protocol initialized"); | |
231 | else | |
232 | BT_ERR("HCIATH3K protocol registration failed"); | |
233 | ||
234 | return err; | |
235 | } | |
236 | ||
f2b94bb9 | 237 | int __exit ath_deinit(void) |
b3190df6 SS |
238 | { |
239 | return hci_uart_unregister_proto(&athp); | |
240 | } |