drivers/bluetooth/hci_ath.c

   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 {
  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         memcpy(&ktermios, tty->termios, sizeof(ktermios));
  62         ktermios.c_cflag &= ~CRTSCTS;
  63         tty_set_termios(tty, &ktermios);
  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 */
  78         ktermios.c_cflag |= CRTSCTS;
  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 */
 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) {
 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
 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 {
 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
 237 int __exit ath_deinit(void)
 238 {
 239         return hci_uart_unregister_proto(&athp);
 240 }