Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
hci_ath.c
Go to the documentation of this file.
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 
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;
50 };
51 
52 static int ath_wakeup_ar3k(struct tty_struct *tty)
53 {
54  struct ktermios ktermios;
55  int status = tty->driver->ops->tiocmget(tty);
56 
57  if (status & TIOCM_CTS)
58  return status;
59 
60  /* Disable Automatic RTSCTS */
61  ktermios = tty->termios;
64 
65  /* Clear RTS first */
66  status = tty->driver->ops->tiocmget(tty);
67  tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS);
68  mdelay(20);
69 
70  /* Set RTS, wake up board */
71  status = tty->driver->ops->tiocmget(tty);
72  tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00);
73  mdelay(20);
74 
75  status = tty->driver->ops->tiocmget(tty);
76 
77  /* Disable Automatic RTSCTS */
79  status = tty_set_termios(tty, &ktermios);
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 */
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_KERNEL);
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 
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);
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  int ret;
205 
206  ret = hci_recv_stream_fragment(hu->hdev, data, count);
207  if (ret < 0) {
208  BT_ERR("Frame Reassembly Failed");
209  return ret;
210  }
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 
225 int __init ath_init(void)
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 
238 {
239  return hci_uart_unregister_proto(&athp);
240 }