linux/drivers/bluetooth/hci_ath.c
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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
  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{
  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;
  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
  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
 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 */
 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) {
 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
 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{
 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
 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
 225int __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
 237int __exit ath_deinit(void)
 238{
 239        return hci_uart_unregister_proto(&athp);
 240}
 241
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