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         int status = tty->driver->ops->tiocmget(tty);
  55
  56         if (status & TIOCM_CTS)
  57                 return status;
  58
  59         /* Clear RTS first */
  60         tty->driver->ops->tiocmget(tty);
  61         tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS);
  62         mdelay(20);
  63
  64         /* Set RTS, wake up board */
  65         tty->driver->ops->tiocmget(tty);
  66         tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00);
  67         mdelay(20);
  68
  69         status = tty->driver->ops->tiocmget(tty);
  70         return status;
  71 }
  72
  73 static void ath_hci_uart_work(struct work_struct *work)
  74 {
  75         int status;
  76         struct ath_struct *ath;
  77         struct hci_uart *hu;
  78         struct tty_struct *tty;
  79
  80         ath = container_of(work, struct ath_struct, ctxtsw);
  81
  82         hu = ath->hu;
  83         tty = hu->tty;
  84
  85         /* verify and wake up controller */
  86         if (ath->cur_sleep) {
  87                 status = ath_wakeup_ar3k(tty);
  88                 if (!(status & TIOCM_CTS))
  89                         return;
  90         }
  91
  92         /* Ready to send Data */
  93         clear_bit(HCI_UART_SENDING, &hu->tx_state);
  94         hci_uart_tx_wakeup(hu);
  95 }
  96
  97 /* Initialize protocol */
  98 static int ath_open(struct hci_uart *hu)
  99 {
 100         struct ath_struct *ath;
 101
 102         BT_DBG("hu %p", hu);
 103
 104         ath = kzalloc(sizeof(*ath), GFP_KERNEL);
 105         if (!ath)
 106                 return -ENOMEM;
 107
 108         skb_queue_head_init(&ath->txq);
 109
 110         hu->priv = ath;
 111         ath->hu = hu;
 112
 113         INIT_WORK(&ath->ctxtsw, ath_hci_uart_work);
 114
 115         return 0;
 116 }
 117
 118 /* Flush protocol data */
 119 static int ath_flush(struct hci_uart *hu)
 120 {
 121         struct ath_struct *ath = hu->priv;
 122
 123         BT_DBG("hu %p", hu);
 124
 125         skb_queue_purge(&ath->txq);
 126
 127         return 0;
 128 }
 129
 130 /* Close protocol */
 131 static int ath_close(struct hci_uart *hu)
 132 {
 133         struct ath_struct *ath = hu->priv;
 134
 135         BT_DBG("hu %p", hu);
 136
 137         skb_queue_purge(&ath->txq);
 138
 139         cancel_work_sync(&ath->ctxtsw);
 140
 141         hu->priv = NULL;
 142         kfree(ath);
 143
 144         return 0;
 145 }
 146
 147 #define HCI_OP_ATH_SLEEP 0xFC04
 148
 149 /* Enqueue frame for transmittion */
 150 static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 151 {
 152         struct ath_struct *ath = hu->priv;
 153
 154         if (bt_cb(skb)->pkt_type == HCI_SCODATA_PKT) {
 155                 kfree_skb(skb);
 156                 return 0;
 157         }
 158
 159         /*
 160          * Update power management enable flag with parameters of
 161          * HCI sleep enable vendor specific HCI command.
 162          */
 163         if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
 164                 struct hci_command_hdr *hdr = (void *)skb->data;
 165
 166                 if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP)
 167                         ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE];
 168         }
 169
 170         BT_DBG("hu %p skb %p", hu, skb);
 171
 172         /* Prepend skb with frame type */
 173         memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
 174
 175         skb_queue_tail(&ath->txq, skb);
 176         set_bit(HCI_UART_SENDING, &hu->tx_state);
 177
 178         schedule_work(&ath->ctxtsw);
 179
 180         return 0;
 181 }
 182
 183 static struct sk_buff *ath_dequeue(struct hci_uart *hu)
 184 {
 185         struct ath_struct *ath = hu->priv;
 186
 187         return skb_dequeue(&ath->txq);
 188 }
 189
 190 /* Recv data */
 191 static int ath_recv(struct hci_uart *hu, void *data, int count)
 192 {
 193         int ret;
 194
 195         ret = hci_recv_stream_fragment(hu->hdev, data, count);
 196         if (ret < 0) {
 197                 BT_ERR("Frame Reassembly Failed");
 198                 return ret;
 199         }
 200
 201         return count;
 202 }
 203
 204 static struct hci_uart_proto athp = {
 205         .id = HCI_UART_ATH3K,
 206         .open = ath_open,
 207         .close = ath_close,
 208         .recv = ath_recv,
 209         .enqueue = ath_enqueue,
 210         .dequeue = ath_dequeue,
 211         .flush = ath_flush,
 212 };
 213
 214 int __init ath_init(void)
 215 {
 216         int err = hci_uart_register_proto(&athp);
 217
 218         if (!err)
 219                 BT_INFO("HCIATH3K protocol initialized");
 220         else
 221                 BT_ERR("HCIATH3K protocol registration failed");
 222
 223         return err;
 224 }
 225
 226 int __exit ath_deinit(void)
 227 {
 228         return hci_uart_unregister_proto(&athp);
 229 }