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 *rx_skb;
  49         struct sk_buff_head txq;
  50         struct work_struct ctxtsw;
  51 };
  52
  53 static int ath_wakeup_ar3k(struct tty_struct *tty)
  54 {
  55         int status = tty->driver->ops->tiocmget(tty);
  56
  57         if (status & TIOCM_CTS)
  58                 return status;
  59
  60         /* Clear RTS first */
  61         tty->driver->ops->tiocmget(tty);
  62         tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS);
  63         mdelay(20);
  64
  65         /* Set RTS, wake up board */
  66         tty->driver->ops->tiocmget(tty);
  67         tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00);
  68         mdelay(20);
  69
  70         status = tty->driver->ops->tiocmget(tty);
  71         return status;
  72 }
  73
  74 static void ath_hci_uart_work(struct work_struct *work)
  75 {
  76         int status;
  77         struct ath_struct *ath;
  78         struct hci_uart *hu;
  79         struct tty_struct *tty;
  80
  81         ath = container_of(work, struct ath_struct, ctxtsw);
  82
  83         hu = ath->hu;
  84         tty = hu->tty;
  85
  86         /* verify and wake up controller */
  87         if (ath->cur_sleep) {
  88                 status = ath_wakeup_ar3k(tty);
  89                 if (!(status & TIOCM_CTS))
  90                         return;
  91         }
  92
  93         /* Ready to send Data */
  94         clear_bit(HCI_UART_SENDING, &hu->tx_state);
  95         hci_uart_tx_wakeup(hu);
  96 }
  97
  98 /* Initialize protocol */
  99 static int ath_open(struct hci_uart *hu)
 100 {
 101         struct ath_struct *ath;
 102
 103         BT_DBG("hu %p", hu);
 104
 105         ath = kzalloc(sizeof(*ath), GFP_KERNEL);
 106         if (!ath)
 107                 return -ENOMEM;
 108
 109         skb_queue_head_init(&ath->txq);
 110
 111         hu->priv = ath;
 112         ath->hu = hu;
 113
 114         INIT_WORK(&ath->ctxtsw, ath_hci_uart_work);
 115
 116         return 0;
 117 }
 118
 119 /* Flush protocol data */
 120 static int ath_flush(struct hci_uart *hu)
 121 {
 122         struct ath_struct *ath = hu->priv;
 123
 124         BT_DBG("hu %p", hu);
 125
 126         skb_queue_purge(&ath->txq);
 127
 128         return 0;
 129 }
 130
 131 /* Close protocol */
 132 static int ath_close(struct hci_uart *hu)
 133 {
 134         struct ath_struct *ath = hu->priv;
 135
 136         BT_DBG("hu %p", hu);
 137
 138         skb_queue_purge(&ath->txq);
 139
 140         kfree_skb(ath->rx_skb);
 141
 142         cancel_work_sync(&ath->ctxtsw);
 143
 144         hu->priv = NULL;
 145         kfree(ath);
 146
 147         return 0;
 148 }
 149
 150 #define HCI_OP_ATH_SLEEP 0xFC04
 151
 152 /* Enqueue frame for transmittion */
 153 static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 154 {
 155         struct ath_struct *ath = hu->priv;
 156
 157         if (bt_cb(skb)->pkt_type == HCI_SCODATA_PKT) {
 158                 kfree_skb(skb);
 159                 return 0;
 160         }
 161
 162         /*
 163          * Update power management enable flag with parameters of
 164          * HCI sleep enable vendor specific HCI command.
 165          */
 166         if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
 167                 struct hci_command_hdr *hdr = (void *)skb->data;
 168
 169                 if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP)
 170                         ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE];
 171         }
 172
 173         BT_DBG("hu %p skb %p", hu, skb);
 174
 175         /* Prepend skb with frame type */
 176         memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
 177
 178         skb_queue_tail(&ath->txq, skb);
 179         set_bit(HCI_UART_SENDING, &hu->tx_state);
 180
 181         schedule_work(&ath->ctxtsw);
 182
 183         return 0;
 184 }
 185
 186 static struct sk_buff *ath_dequeue(struct hci_uart *hu)
 187 {
 188         struct ath_struct *ath = hu->priv;
 189
 190         return skb_dequeue(&ath->txq);
 191 }
 192
 193 static const struct h4_recv_pkt ath_recv_pkts[] = {
 194         { H4_RECV_ACL,   .recv = hci_recv_frame },
 195         { H4_RECV_SCO,   .recv = hci_recv_frame },
 196         { H4_RECV_EVENT, .recv = hci_recv_frame },
 197 };
 198
 199 /* Recv data */
 200 static int ath_recv(struct hci_uart *hu, const void *data, int count)
 201 {
 202         struct ath_struct *ath = hu->priv;
 203
 204         ath->rx_skb = h4_recv_buf(hu->hdev, ath->rx_skb, data, count,
 205                                   ath_recv_pkts, ARRAY_SIZE(ath_recv_pkts));
 206         if (IS_ERR(ath->rx_skb)) {
 207                 int err = PTR_ERR(ath->rx_skb);
 208                 BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
 209                 return err;
 210         }
 211
 212         return count;
 213 }
 214
 215 static const struct hci_uart_proto athp = {
 216         .id             = HCI_UART_ATH3K,
 217         .name           = "ATH3K",
 218         .open           = ath_open,
 219         .close          = ath_close,
 220         .recv           = ath_recv,
 221         .enqueue        = ath_enqueue,
 222         .dequeue        = ath_dequeue,
 223         .flush          = ath_flush,
 224 };
 225
 226 int __init ath_init(void)
 227 {
 228         return hci_uart_register_proto(&athp);
 229 }
 230
 231 int __exit ath_deinit(void)
 232 {
 233         return hci_uart_unregister_proto(&athp);
 234 }