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Suraj Sumangalab3190df2010-07-19 12:34:07 +05301/*
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
44struct 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
52static int ath_wakeup_ar3k(struct tty_struct *tty)
53{
Alan Coxafaae082011-02-14 16:28:18 +000054 struct ktermios ktermios;
55 int status = tty->driver->ops->tiocmget(tty);
Suraj Sumangalab3190df2010-07-19 12:34:07 +053056
57 if (status & TIOCM_CTS)
58 return status;
59
60 /* Disable Automatic RTSCTS */
Alan Coxadc8d742012-07-14 15:31:47 +010061 ktermios = tty->termios;
Alan Coxafaae082011-02-14 16:28:18 +000062 ktermios.c_cflag &= ~CRTSCTS;
63 tty_set_termios(tty, &ktermios);
Suraj Sumangalab3190df2010-07-19 12:34:07 +053064
65 /* Clear RTS first */
Alan Coxafaae082011-02-14 16:28:18 +000066 status = tty->driver->ops->tiocmget(tty);
67 tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS);
Suraj Sumangalab3190df2010-07-19 12:34:07 +053068 mdelay(20);
69
70 /* Set RTS, wake up board */
Alan Coxafaae082011-02-14 16:28:18 +000071 status = tty->driver->ops->tiocmget(tty);
72 tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00);
Suraj Sumangalab3190df2010-07-19 12:34:07 +053073 mdelay(20);
74
Alan Coxafaae082011-02-14 16:28:18 +000075 status = tty->driver->ops->tiocmget(tty);
Suraj Sumangalab3190df2010-07-19 12:34:07 +053076
Alan Coxafaae082011-02-14 16:28:18 +000077 /* Disable Automatic RTSCTS */
78 ktermios.c_cflag |= CRTSCTS;
79 status = tty_set_termios(tty, &ktermios);
Suraj Sumangalab3190df2010-07-19 12:34:07 +053080
81 return status;
82}
83
84static 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 */
109static int ath_open(struct hci_uart *hu)
110{
111 struct ath_struct *ath;
112
113 BT_DBG("hu %p", hu);
114
David Herrmannf5fd5ba2012-01-07 15:19:40 +0100115 ath = kzalloc(sizeof(*ath), GFP_KERNEL);
Suraj Sumangalab3190df2010-07-19 12:34:07 +0530116 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 */
130static 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 */
142static 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 */
161static 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) {
Dan Carpenter4ebaa4e2010-07-23 12:11:04 +0200166 kfree_skb(skb);
Suraj Sumangalab3190df2010-07-19 12:34:07 +0530167 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
194static 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 */
202static int ath_recv(struct hci_uart *hu, void *data, int count)
203{
Jiejing Zhang78b4a562011-04-07 20:37:06 +0800204 int ret;
205
206 ret = hci_recv_stream_fragment(hu->hdev, data, count);
207 if (ret < 0) {
Suraj Sumangalab3190df2010-07-19 12:34:07 +0530208 BT_ERR("Frame Reassembly Failed");
Jiejing Zhang78b4a562011-04-07 20:37:06 +0800209 return ret;
210 }
Suraj Sumangalab3190df2010-07-19 12:34:07 +0530211
212 return count;
213}
214
215static 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
Gustavo F. Padovanf2b94bb2010-07-24 02:04:44 -0300225int __init ath_init(void)
Suraj Sumangalab3190df2010-07-19 12:34:07 +0530226{
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
Gustavo F. Padovanf2b94bb2010-07-24 02:04:44 -0300237int __exit ath_deinit(void)
Suraj Sumangalab3190df2010-07-19 12:34:07 +0530238{
239 return hci_uart_unregister_proto(&athp);
240}