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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 *rx_skb; | |
49 | struct sk_buff_head txq; | |
50 | struct work_struct ctxtsw; | |
51 | }; | |
52 | ||
53 | #define OP_WRITE_TAG 0x01 | |
54 | ||
55 | #define INDEX_BDADDR 0x01 | |
56 | ||
57 | struct ath_vendor_cmd { | |
58 | __u8 opcode; | |
59 | __le16 index; | |
60 | __u8 len; | |
61 | __u8 data[251]; | |
62 | } __packed; | |
63 | ||
64 | static int ath_wakeup_ar3k(struct tty_struct *tty) | |
65 | { | |
66 | int status = tty->driver->ops->tiocmget(tty); | |
67 | ||
68 | if (status & TIOCM_CTS) | |
69 | return status; | |
70 | ||
71 | /* Clear RTS first */ | |
72 | tty->driver->ops->tiocmget(tty); | |
73 | tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS); | |
74 | mdelay(20); | |
75 | ||
76 | /* Set RTS, wake up board */ | |
77 | tty->driver->ops->tiocmget(tty); | |
78 | tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00); | |
79 | mdelay(20); | |
80 | ||
81 | status = tty->driver->ops->tiocmget(tty); | |
82 | return status; | |
83 | } | |
84 | ||
85 | static void ath_hci_uart_work(struct work_struct *work) | |
86 | { | |
87 | int status; | |
88 | struct ath_struct *ath; | |
89 | struct hci_uart *hu; | |
90 | struct tty_struct *tty; | |
91 | ||
92 | ath = container_of(work, struct ath_struct, ctxtsw); | |
93 | ||
94 | hu = ath->hu; | |
95 | tty = hu->tty; | |
96 | ||
97 | /* verify and wake up controller */ | |
98 | if (ath->cur_sleep) { | |
99 | status = ath_wakeup_ar3k(tty); | |
100 | if (!(status & TIOCM_CTS)) | |
101 | return; | |
102 | } | |
103 | ||
104 | /* Ready to send Data */ | |
105 | clear_bit(HCI_UART_SENDING, &hu->tx_state); | |
106 | hci_uart_tx_wakeup(hu); | |
107 | } | |
108 | ||
109 | static int ath_open(struct hci_uart *hu) | |
110 | { | |
111 | struct ath_struct *ath; | |
112 | ||
113 | BT_DBG("hu %p", hu); | |
114 | ||
115 | if (!hci_uart_has_flow_control(hu)) | |
116 | return -EOPNOTSUPP; | |
117 | ||
118 | ath = kzalloc(sizeof(*ath), GFP_KERNEL); | |
119 | if (!ath) | |
120 | return -ENOMEM; | |
121 | ||
122 | skb_queue_head_init(&ath->txq); | |
123 | ||
124 | hu->priv = ath; | |
125 | ath->hu = hu; | |
126 | ||
127 | INIT_WORK(&ath->ctxtsw, ath_hci_uart_work); | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
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 | static int ath_flush(struct hci_uart *hu) | |
151 | { | |
152 | struct ath_struct *ath = hu->priv; | |
153 | ||
154 | BT_DBG("hu %p", hu); | |
155 | ||
156 | skb_queue_purge(&ath->txq); | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | static int ath_vendor_cmd(struct hci_dev *hdev, uint8_t opcode, uint16_t index, | |
162 | const void *data, size_t dlen) | |
163 | { | |
164 | struct sk_buff *skb; | |
165 | struct ath_vendor_cmd cmd; | |
166 | ||
167 | if (dlen > sizeof(cmd.data)) | |
168 | return -EINVAL; | |
169 | ||
170 | cmd.opcode = opcode; | |
171 | cmd.index = cpu_to_le16(index); | |
172 | cmd.len = dlen; | |
173 | memcpy(cmd.data, data, dlen); | |
174 | ||
175 | skb = __hci_cmd_sync(hdev, 0xfc0b, dlen + 4, &cmd, HCI_INIT_TIMEOUT); | |
176 | if (IS_ERR(skb)) | |
177 | return PTR_ERR(skb); | |
178 | kfree_skb(skb); | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | static int ath_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr) | |
184 | { | |
185 | return ath_vendor_cmd(hdev, OP_WRITE_TAG, INDEX_BDADDR, bdaddr, | |
186 | sizeof(*bdaddr)); | |
187 | } | |
188 | ||
189 | static int ath_setup(struct hci_uart *hu) | |
190 | { | |
191 | BT_DBG("hu %p", hu); | |
192 | ||
193 | hu->hdev->set_bdaddr = ath_set_bdaddr; | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static const struct h4_recv_pkt ath_recv_pkts[] = { | |
199 | { H4_RECV_ACL, .recv = hci_recv_frame }, | |
200 | { H4_RECV_SCO, .recv = hci_recv_frame }, | |
201 | { H4_RECV_EVENT, .recv = hci_recv_frame }, | |
202 | }; | |
203 | ||
204 | static int ath_recv(struct hci_uart *hu, const void *data, int count) | |
205 | { | |
206 | struct ath_struct *ath = hu->priv; | |
207 | ||
208 | ath->rx_skb = h4_recv_buf(hu->hdev, ath->rx_skb, data, count, | |
209 | ath_recv_pkts, ARRAY_SIZE(ath_recv_pkts)); | |
210 | if (IS_ERR(ath->rx_skb)) { | |
211 | int err = PTR_ERR(ath->rx_skb); | |
212 | bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err); | |
213 | ath->rx_skb = NULL; | |
214 | return err; | |
215 | } | |
216 | ||
217 | return count; | |
218 | } | |
219 | ||
220 | #define HCI_OP_ATH_SLEEP 0xFC04 | |
221 | ||
222 | static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb) | |
223 | { | |
224 | struct ath_struct *ath = hu->priv; | |
225 | ||
226 | if (hci_skb_pkt_type(skb) == HCI_SCODATA_PKT) { | |
227 | kfree_skb(skb); | |
228 | return 0; | |
229 | } | |
230 | ||
231 | /* Update power management enable flag with parameters of | |
232 | * HCI sleep enable vendor specific HCI command. | |
233 | */ | |
234 | if (hci_skb_pkt_type(skb) == HCI_COMMAND_PKT) { | |
235 | struct hci_command_hdr *hdr = (void *)skb->data; | |
236 | ||
237 | if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP) | |
238 | ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE]; | |
239 | } | |
240 | ||
241 | BT_DBG("hu %p skb %p", hu, skb); | |
242 | ||
243 | /* Prepend skb with frame type */ | |
244 | memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); | |
245 | ||
246 | skb_queue_tail(&ath->txq, skb); | |
247 | set_bit(HCI_UART_SENDING, &hu->tx_state); | |
248 | ||
249 | schedule_work(&ath->ctxtsw); | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
254 | static struct sk_buff *ath_dequeue(struct hci_uart *hu) | |
255 | { | |
256 | struct ath_struct *ath = hu->priv; | |
257 | ||
258 | return skb_dequeue(&ath->txq); | |
259 | } | |
260 | ||
261 | static const struct hci_uart_proto athp = { | |
262 | .id = HCI_UART_ATH3K, | |
263 | .name = "ATH3K", | |
264 | .manufacturer = 69, | |
265 | .open = ath_open, | |
266 | .close = ath_close, | |
267 | .flush = ath_flush, | |
268 | .setup = ath_setup, | |
269 | .recv = ath_recv, | |
270 | .enqueue = ath_enqueue, | |
271 | .dequeue = ath_dequeue, | |
272 | }; | |
273 | ||
274 | int __init ath_init(void) | |
275 | { | |
276 | return hci_uart_register_proto(&athp); | |
277 | } | |
278 | ||
279 | int __exit ath_deinit(void) | |
280 | { | |
281 | return hci_uart_unregister_proto(&athp); | |
282 | } |