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 #define OP_WRITE_TAG    0x01
  54
  55 #define INDEX_BDADDR    0x01
  56
  57 struct ath_vendor_cmd {
  58         __u8 opcode;
  59         __le16 index;
  60         __u8 len;
  61         __u8 data[251];
  62 } __packed;
  63
  64 static int ath_wakeup_ar3k(struct tty_struct *tty)
  65 {
  66         int status = tty->driver->ops->tiocmget(tty);
  67
  68         if (status & TIOCM_CTS)
  69                 return status;
  70
  71         /* Clear RTS first */
  72         tty->driver->ops->tiocmget(tty);
  73         tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS);
  74         msleep(20);
  75
  76         /* Set RTS, wake up board */
  77         tty->driver->ops->tiocmget(tty);
  78         tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00);
  79         msleep(20);
  80
  81         status = tty->driver->ops->tiocmget(tty);
  82         return status;
  83 }
  84
  85 static void ath_hci_uart_work(struct work_struct *work)
  86 {
  87         int status;
  88         struct ath_struct *ath;
  89         struct hci_uart *hu;
  90         struct tty_struct *tty;
  91
  92         ath = container_of(work, struct ath_struct, ctxtsw);
  93
  94         hu = ath->hu;
  95         tty = hu->tty;
  96
  97         /* verify and wake up controller */
  98         if (ath->cur_sleep) {
  99                 status = ath_wakeup_ar3k(tty);
 100                 if (!(status & TIOCM_CTS))
 101                         return;
 102         }
 103
 104         /* Ready to send Data */
 105         clear_bit(HCI_UART_SENDING, &hu->tx_state);
 106         hci_uart_tx_wakeup(hu);
 107 }
 108
 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_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 static int ath_close(struct hci_uart *hu)
 130 {
 131         struct ath_struct *ath = hu->priv;
 132
 133         BT_DBG("hu %p", hu);
 134
 135         skb_queue_purge(&ath->txq);
 136
 137         kfree_skb(ath->rx_skb);
 138
 139         cancel_work_sync(&ath->ctxtsw);
 140
 141         hu->priv = NULL;
 142         kfree(ath);
 143
 144         return 0;
 145 }
 146
 147 static int ath_flush(struct hci_uart *hu)
 148 {
 149         struct ath_struct *ath = hu->priv;
 150
 151         BT_DBG("hu %p", hu);
 152
 153         skb_queue_purge(&ath->txq);
 154
 155         return 0;
 156 }
 157
 158 static int ath_vendor_cmd(struct hci_dev *hdev, uint8_t opcode, uint16_t index,
 159                           const void *data, size_t dlen)
 160 {
 161         struct sk_buff *skb;
 162         struct ath_vendor_cmd cmd;
 163
 164         if (dlen > sizeof(cmd.data))
 165                 return -EINVAL;
 166
 167         cmd.opcode = opcode;
 168         cmd.index = cpu_to_le16(index);
 169         cmd.len = dlen;
 170         memcpy(cmd.data, data, dlen);
 171
 172         skb = __hci_cmd_sync(hdev, 0xfc0b, dlen + 4, &cmd, HCI_INIT_TIMEOUT);
 173         if (IS_ERR(skb))
 174                 return PTR_ERR(skb);
 175         kfree_skb(skb);
 176
 177         return 0;
 178 }
 179
 180 static int ath_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
 181 {
 182         return ath_vendor_cmd(hdev, OP_WRITE_TAG, INDEX_BDADDR, bdaddr,
 183                               sizeof(*bdaddr));
 184 }
 185
 186 static int ath_setup(struct hci_uart *hu)
 187 {
 188         BT_DBG("hu %p", hu);
 189
 190         hu->hdev->set_bdaddr = ath_set_bdaddr;
 191
 192         return 0;
 193 }
 194
 195 static const struct h4_recv_pkt ath_recv_pkts[] = {
 196         { H4_RECV_ACL,   .recv = hci_recv_frame },
 197         { H4_RECV_SCO,   .recv = hci_recv_frame },
 198         { H4_RECV_EVENT, .recv = hci_recv_frame },
 199 };
 200
 201 static int ath_recv(struct hci_uart *hu, const void *data, int count)
 202 {
 203         struct ath_struct *ath = hu->priv;
 204
 205         ath->rx_skb = h4_recv_buf(hu->hdev, ath->rx_skb, data, count,
 206                                   ath_recv_pkts, ARRAY_SIZE(ath_recv_pkts));
 207         if (IS_ERR(ath->rx_skb)) {
 208                 int err = PTR_ERR(ath->rx_skb);
 209                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
 210                 ath->rx_skb = NULL;
 211                 return err;
 212         }
 213
 214         return count;
 215 }
 216
 217 #define HCI_OP_ATH_SLEEP 0xFC04
 218
 219 static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 220 {
 221         struct ath_struct *ath = hu->priv;
 222
 223         if (hci_skb_pkt_type(skb) == HCI_SCODATA_PKT) {
 224                 kfree_skb(skb);
 225                 return 0;
 226         }
 227
 228         /* Update power management enable flag with parameters of
 229          * HCI sleep enable vendor specific HCI command.
 230          */
 231         if (hci_skb_pkt_type(skb) == HCI_COMMAND_PKT) {
 232                 struct hci_command_hdr *hdr = (void *)skb->data;
 233
 234                 if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP)
 235                         ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE];
 236         }
 237
 238         BT_DBG("hu %p skb %p", hu, skb);
 239
 240         /* Prepend skb with frame type */
 241         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 242
 243         skb_queue_tail(&ath->txq, skb);
 244         set_bit(HCI_UART_SENDING, &hu->tx_state);
 245
 246         schedule_work(&ath->ctxtsw);
 247
 248         return 0;
 249 }
 250
 251 static struct sk_buff *ath_dequeue(struct hci_uart *hu)
 252 {
 253         struct ath_struct *ath = hu->priv;
 254
 255         return skb_dequeue(&ath->txq);
 256 }
 257
 258 static const struct hci_uart_proto athp = {
 259         .id             = HCI_UART_ATH3K,
 260         .name           = "ATH3K",
 261         .manufacturer   = 69,
 262         .open           = ath_open,
 263         .close          = ath_close,
 264         .flush          = ath_flush,
 265         .setup          = ath_setup,
 266         .recv           = ath_recv,
 267         .enqueue        = ath_enqueue,
 268         .dequeue        = ath_dequeue,
 269 };
 270
 271 int __init ath_init(void)
 272 {
 273         return hci_uart_register_proto(&athp);
 274 }
 275
 276 int __exit ath_deinit(void)
 277 {
 278         return hci_uart_unregister_proto(&athp);
 279 }