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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 | ||
d90aa682 | 48 | struct sk_buff *rx_skb; |
b3190df6 SS |
49 | struct sk_buff_head txq; |
50 | struct work_struct ctxtsw; | |
51 | }; | |
52 | ||
13df5000 LP |
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 | ||
b3190df6 SS |
64 | static int ath_wakeup_ar3k(struct tty_struct *tty) |
65 | { | |
afaae084 | 66 | int status = tty->driver->ops->tiocmget(tty); |
b3190df6 SS |
67 | |
68 | if (status & TIOCM_CTS) | |
69 | return status; | |
70 | ||
b3190df6 | 71 | /* Clear RTS first */ |
632f32e2 | 72 | tty->driver->ops->tiocmget(tty); |
afaae084 | 73 | tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS); |
b3190df6 SS |
74 | mdelay(20); |
75 | ||
76 | /* Set RTS, wake up board */ | |
632f32e2 | 77 | tty->driver->ops->tiocmget(tty); |
afaae084 | 78 | tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00); |
b3190df6 SS |
79 | mdelay(20); |
80 | ||
afaae084 | 81 | status = tty->driver->ops->tiocmget(tty); |
b3190df6 SS |
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 | ||
b3190df6 SS |
109 | static int ath_open(struct hci_uart *hu) |
110 | { | |
111 | struct ath_struct *ath; | |
112 | ||
113 | BT_DBG("hu %p", hu); | |
114 | ||
f5fd5bae | 115 | ath = kzalloc(sizeof(*ath), GFP_KERNEL); |
b3190df6 SS |
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 | ||
c0ba7acd | 129 | static int ath_close(struct hci_uart *hu) |
b3190df6 SS |
130 | { |
131 | struct ath_struct *ath = hu->priv; | |
132 | ||
133 | BT_DBG("hu %p", hu); | |
134 | ||
135 | skb_queue_purge(&ath->txq); | |
136 | ||
c0ba7acd MH |
137 | kfree_skb(ath->rx_skb); |
138 | ||
139 | cancel_work_sync(&ath->ctxtsw); | |
140 | ||
141 | hu->priv = NULL; | |
142 | kfree(ath); | |
143 | ||
b3190df6 SS |
144 | return 0; |
145 | } | |
146 | ||
c0ba7acd | 147 | static int ath_flush(struct hci_uart *hu) |
b3190df6 SS |
148 | { |
149 | struct ath_struct *ath = hu->priv; | |
150 | ||
151 | BT_DBG("hu %p", hu); | |
152 | ||
153 | skb_queue_purge(&ath->txq); | |
154 | ||
c0ba7acd MH |
155 | return 0; |
156 | } | |
d90aa682 | 157 | |
13df5000 LP |
158 | static int ath_vendor_cmd(struct hci_dev *hdev, uint8_t opcode, uint16_t index, |
159 | const void *data, size_t dlen) | |
4c876c0e MH |
160 | { |
161 | struct sk_buff *skb; | |
13df5000 LP |
162 | struct ath_vendor_cmd cmd; |
163 | ||
164 | if (dlen > sizeof(cmd.data)) | |
165 | return -EINVAL; | |
166 | ||
167 | cmd.opcode = opcode; | |
168 | cmd.index = cpu_to_le16(index); | |
169 | cmd.len = dlen; | |
170 | memcpy(cmd.data, data, dlen); | |
171 | ||
172 | skb = __hci_cmd_sync(hdev, 0xfc0b, dlen + 4, &cmd, HCI_INIT_TIMEOUT); | |
173 | if (IS_ERR(skb)) | |
174 | return PTR_ERR(skb); | |
4c876c0e MH |
175 | kfree_skb(skb); |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
13df5000 LP |
180 | static int ath_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr) |
181 | { | |
182 | return ath_vendor_cmd(hdev, OP_WRITE_TAG, INDEX_BDADDR, bdaddr, | |
183 | sizeof(*bdaddr)); | |
184 | } | |
185 | ||
4c876c0e MH |
186 | static int ath_setup(struct hci_uart *hu) |
187 | { | |
188 | BT_DBG("hu %p", hu); | |
189 | ||
190 | hu->hdev->set_bdaddr = ath_set_bdaddr; | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
c0ba7acd MH |
195 | static const struct h4_recv_pkt ath_recv_pkts[] = { |
196 | { H4_RECV_ACL, .recv = hci_recv_frame }, | |
197 | { H4_RECV_SCO, .recv = hci_recv_frame }, | |
198 | { H4_RECV_EVENT, .recv = hci_recv_frame }, | |
199 | }; | |
b3190df6 | 200 | |
c0ba7acd MH |
201 | static int ath_recv(struct hci_uart *hu, const void *data, int count) |
202 | { | |
203 | struct ath_struct *ath = hu->priv; | |
b3190df6 | 204 | |
c0ba7acd MH |
205 | ath->rx_skb = h4_recv_buf(hu->hdev, ath->rx_skb, data, count, |
206 | ath_recv_pkts, ARRAY_SIZE(ath_recv_pkts)); | |
207 | if (IS_ERR(ath->rx_skb)) { | |
208 | int err = PTR_ERR(ath->rx_skb); | |
209 | BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err); | |
37134167 | 210 | ath->rx_skb = NULL; |
c0ba7acd MH |
211 | return err; |
212 | } | |
213 | ||
214 | return count; | |
b3190df6 SS |
215 | } |
216 | ||
217 | #define HCI_OP_ATH_SLEEP 0xFC04 | |
218 | ||
b3190df6 SS |
219 | static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb) |
220 | { | |
221 | struct ath_struct *ath = hu->priv; | |
222 | ||
618e8bc2 | 223 | if (hci_skb_pkt_type(skb) == HCI_SCODATA_PKT) { |
4ebaa4ed | 224 | kfree_skb(skb); |
b3190df6 SS |
225 | return 0; |
226 | } | |
227 | ||
c0ba7acd | 228 | /* Update power management enable flag with parameters of |
b3190df6 SS |
229 | * HCI sleep enable vendor specific HCI command. |
230 | */ | |
618e8bc2 | 231 | if (hci_skb_pkt_type(skb) == HCI_COMMAND_PKT) { |
b3190df6 SS |
232 | struct hci_command_hdr *hdr = (void *)skb->data; |
233 | ||
234 | if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP) | |
235 | ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE]; | |
236 | } | |
237 | ||
238 | BT_DBG("hu %p skb %p", hu, skb); | |
239 | ||
240 | /* Prepend skb with frame type */ | |
618e8bc2 | 241 | memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); |
b3190df6 SS |
242 | |
243 | skb_queue_tail(&ath->txq, skb); | |
244 | set_bit(HCI_UART_SENDING, &hu->tx_state); | |
245 | ||
246 | schedule_work(&ath->ctxtsw); | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | static struct sk_buff *ath_dequeue(struct hci_uart *hu) | |
252 | { | |
253 | struct ath_struct *ath = hu->priv; | |
254 | ||
255 | return skb_dequeue(&ath->txq); | |
256 | } | |
257 | ||
4ee7ef19 | 258 | static const struct hci_uart_proto athp = { |
7c40fb8d MH |
259 | .id = HCI_UART_ATH3K, |
260 | .name = "ATH3K", | |
aee61f7a | 261 | .manufacturer = 69, |
7c40fb8d MH |
262 | .open = ath_open, |
263 | .close = ath_close, | |
c0ba7acd | 264 | .flush = ath_flush, |
4c876c0e | 265 | .setup = ath_setup, |
7c40fb8d MH |
266 | .recv = ath_recv, |
267 | .enqueue = ath_enqueue, | |
268 | .dequeue = ath_dequeue, | |
b3190df6 SS |
269 | }; |
270 | ||
f2b94bb9 | 271 | int __init ath_init(void) |
b3190df6 | 272 | { |
01009eec | 273 | return hci_uart_register_proto(&athp); |
b3190df6 SS |
274 | } |
275 | ||
f2b94bb9 | 276 | int __exit ath_deinit(void) |
b3190df6 SS |
277 | { |
278 | return hci_uart_unregister_proto(&athp); | |
279 | } |