linux/drivers/bluetooth/hci_ath.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  Atheros Communication Bluetooth HCIATH3K UART protocol
   4 *
   5 *  HCIATH3K (HCI Atheros AR300x Protocol) is a Atheros Communication's
   6 *  power management protocol extension to H4 to support AR300x Bluetooth Chip.
   7 *
   8 *  Copyright (c) 2009-2010 Atheros Communications Inc.
   9 *
  10 *  Acknowledgements:
  11 *  This file is based on hci_h4.c, which was written
  12 *  by Maxim Krasnyansky and Marcel Holtmann.
  13 */
  14
  15#include <linux/module.h>
  16#include <linux/kernel.h>
  17
  18#include <linux/init.h>
  19#include <linux/slab.h>
  20#include <linux/tty.h>
  21#include <linux/errno.h>
  22#include <linux/ioctl.h>
  23#include <linux/skbuff.h>
  24
  25#include <net/bluetooth/bluetooth.h>
  26#include <net/bluetooth/hci_core.h>
  27
  28#include "hci_uart.h"
  29
  30struct ath_struct {
  31        struct hci_uart *hu;
  32        unsigned int cur_sleep;
  33
  34        struct sk_buff *rx_skb;
  35        struct sk_buff_head txq;
  36        struct work_struct ctxtsw;
  37};
  38
  39#define OP_WRITE_TAG    0x01
  40
  41#define INDEX_BDADDR    0x01
  42
  43struct ath_vendor_cmd {
  44        __u8 opcode;
  45        __le16 index;
  46        __u8 len;
  47        __u8 data[251];
  48} __packed;
  49
  50static int ath_wakeup_ar3k(struct tty_struct *tty)
  51{
  52        int status = tty->driver->ops->tiocmget(tty);
  53
  54        if (status & TIOCM_CTS)
  55                return status;
  56
  57        /* Clear RTS first */
  58        tty->driver->ops->tiocmget(tty);
  59        tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS);
  60        msleep(20);
  61
  62        /* Set RTS, wake up board */
  63        tty->driver->ops->tiocmget(tty);
  64        tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00);
  65        msleep(20);
  66
  67        status = tty->driver->ops->tiocmget(tty);
  68        return status;
  69}
  70
  71static void ath_hci_uart_work(struct work_struct *work)
  72{
  73        int status;
  74        struct ath_struct *ath;
  75        struct hci_uart *hu;
  76        struct tty_struct *tty;
  77
  78        ath = container_of(work, struct ath_struct, ctxtsw);
  79
  80        hu = ath->hu;
  81        tty = hu->tty;
  82
  83        /* verify and wake up controller */
  84        if (ath->cur_sleep) {
  85                status = ath_wakeup_ar3k(tty);
  86                if (!(status & TIOCM_CTS))
  87                        return;
  88        }
  89
  90        /* Ready to send Data */
  91        clear_bit(HCI_UART_SENDING, &hu->tx_state);
  92        hci_uart_tx_wakeup(hu);
  93}
  94
  95static int ath_open(struct hci_uart *hu)
  96{
  97        struct ath_struct *ath;
  98
  99        BT_DBG("hu %p", hu);
 100
 101        if (!hci_uart_has_flow_control(hu))
 102                return -EOPNOTSUPP;
 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
 118static int ath_close(struct hci_uart *hu)
 119{
 120        struct ath_struct *ath = hu->priv;
 121
 122        BT_DBG("hu %p", hu);
 123
 124        skb_queue_purge(&ath->txq);
 125
 126        kfree_skb(ath->rx_skb);
 127
 128        cancel_work_sync(&ath->ctxtsw);
 129
 130        hu->priv = NULL;
 131        kfree(ath);
 132
 133        return 0;
 134}
 135
 136static int ath_flush(struct hci_uart *hu)
 137{
 138        struct ath_struct *ath = hu->priv;
 139
 140        BT_DBG("hu %p", hu);
 141
 142        skb_queue_purge(&ath->txq);
 143
 144        return 0;
 145}
 146
 147static int ath_vendor_cmd(struct hci_dev *hdev, uint8_t opcode, uint16_t index,
 148                          const void *data, size_t dlen)
 149{
 150        struct sk_buff *skb;
 151        struct ath_vendor_cmd cmd;
 152
 153        if (dlen > sizeof(cmd.data))
 154                return -EINVAL;
 155
 156        cmd.opcode = opcode;
 157        cmd.index = cpu_to_le16(index);
 158        cmd.len = dlen;
 159        memcpy(cmd.data, data, dlen);
 160
 161        skb = __hci_cmd_sync(hdev, 0xfc0b, dlen + 4, &cmd, HCI_INIT_TIMEOUT);
 162        if (IS_ERR(skb))
 163                return PTR_ERR(skb);
 164        kfree_skb(skb);
 165
 166        return 0;
 167}
 168
 169static int ath_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
 170{
 171        return ath_vendor_cmd(hdev, OP_WRITE_TAG, INDEX_BDADDR, bdaddr,
 172                              sizeof(*bdaddr));
 173}
 174
 175static int ath_setup(struct hci_uart *hu)
 176{
 177        BT_DBG("hu %p", hu);
 178
 179        hu->hdev->set_bdaddr = ath_set_bdaddr;
 180
 181        return 0;
 182}
 183
 184static const struct h4_recv_pkt ath_recv_pkts[] = {
 185        { H4_RECV_ACL,   .recv = hci_recv_frame },
 186        { H4_RECV_SCO,   .recv = hci_recv_frame },
 187        { H4_RECV_EVENT, .recv = hci_recv_frame },
 188};
 189
 190static int ath_recv(struct hci_uart *hu, const void *data, int count)
 191{
 192        struct ath_struct *ath = hu->priv;
 193
 194        ath->rx_skb = h4_recv_buf(hu->hdev, ath->rx_skb, data, count,
 195                                  ath_recv_pkts, ARRAY_SIZE(ath_recv_pkts));
 196        if (IS_ERR(ath->rx_skb)) {
 197                int err = PTR_ERR(ath->rx_skb);
 198                bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
 199                ath->rx_skb = NULL;
 200                return err;
 201        }
 202
 203        return count;
 204}
 205
 206#define HCI_OP_ATH_SLEEP 0xFC04
 207
 208static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 209{
 210        struct ath_struct *ath = hu->priv;
 211
 212        if (hci_skb_pkt_type(skb) == HCI_SCODATA_PKT) {
 213                kfree_skb(skb);
 214                return 0;
 215        }
 216
 217        /* Update power management enable flag with parameters of
 218         * HCI sleep enable vendor specific HCI command.
 219         */
 220        if (hci_skb_pkt_type(skb) == HCI_COMMAND_PKT) {
 221                struct hci_command_hdr *hdr = (void *)skb->data;
 222
 223                if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP)
 224                        ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE];
 225        }
 226
 227        BT_DBG("hu %p skb %p", hu, skb);
 228
 229        /* Prepend skb with frame type */
 230        memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 231
 232        skb_queue_tail(&ath->txq, skb);
 233        set_bit(HCI_UART_SENDING, &hu->tx_state);
 234
 235        schedule_work(&ath->ctxtsw);
 236
 237        return 0;
 238}
 239
 240static struct sk_buff *ath_dequeue(struct hci_uart *hu)
 241{
 242        struct ath_struct *ath = hu->priv;
 243
 244        return skb_dequeue(&ath->txq);
 245}
 246
 247static const struct hci_uart_proto athp = {
 248        .id             = HCI_UART_ATH3K,
 249        .name           = "ATH3K",
 250        .manufacturer   = 69,
 251        .open           = ath_open,
 252        .close          = ath_close,
 253        .flush          = ath_flush,
 254        .setup          = ath_setup,
 255        .recv           = ath_recv,
 256        .enqueue        = ath_enqueue,
 257        .dequeue        = ath_dequeue,
 258};
 259
 260int __init ath_init(void)
 261{
 262        return hci_uart_register_proto(&athp);
 263}
 264
 265int __exit ath_deinit(void)
 266{
 267        return hci_uart_unregister_proto(&athp);
 268}
 269
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