很楠不爱3

这个屌丝很懒，什么也没留下！

热门标签

hci_uart 分析_hci_uart_rx

作者：很楠不爱3 | 2024-03-27 20:00:03

踩

hci_uart_rx

先从初始化开始

__init hci_uart_init(void)

｛

…… //注册ldisc

hci_uart_ldisc.magic = TTY_LDISC_MAGIC; //通过i = N_HCI; if (ioctl(fd, TIOCSETD, &i) < 0)获得

hci_uart_ldisc.name = "n_hci";

hci_uart_ldisc.open = hci_uart_tty_open;

hci_uart_ldisc.close = hci_uart_tty_close;

hci_uart_ldisc.read = hci_uart_tty_read;

hci_uart_ldisc.write = hci_uart_tty_write;

hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;

hci_uart_ldisc.poll = hci_uart_tty_poll;

hci_uart_ldisc.receive_buf = hci_uart_tty_receive;

hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup; // ldisc对应的处理函数

hci_uart_ldisc.owner = THIS_MODULE;

……

if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc)))

……

bcsp_init(); //取决于hciattach中选择的uart[]

……

}

源码在/drivers/char/tty_io.c

int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc)

{

unsigned long flags;

int ret = 0;

if (disc < N_TTY || disc >= NR_LDISCS)

return -EINVAL;

spin_lock_irqsave(&tty_ldisc_lock, flags);

tty_ldiscs[disc] = *new_ldisc;

tty_ldiscs[disc].num = disc;

tty_ldiscs[disc].flags |= LDISC_FLAG_DEFINED;

tty_ldiscs[disc].refcount = 0;

spin_unlock_irqrestore(&tty_ldisc_lock, flags);

return ret;

}

/* Line disc dispatch table */

static struct tty_ldisc tty_ldiscs[NR_LDISCS];

bcsp_init()--> hci_uart_register_proto(&bcsp); //注册proto操作函数

{

if (p->id >= HCI_UART_MAX_PROTO)

return -EINVAL;

if (hup[p->id])

return -EEXIST;

hup[p->id] = p; //static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];

return 0;

}

struct hci_uart_proto {

unsigned int id;

int (*open)(struct hci_uart *hu);

int (*close)(struct hci_uart *hu);

int (*flush)(struct hci_uart *hu);

int (*recv)(struct hci_uart *hu, void *data, int len);

int (*enqueue)(struct hci_uart *hu, struct sk_buff *skb);

struct sk_buff *(*dequeue)(struct hci_uart *hu);

};

struct hci_uart {

struct tty_struct *tty;

struct hci_dev *hdev;

unsigned long flags;

unsigned long hdev_flags;

struct hci_uart_proto *proto;

void *priv;

struct sk_buff *tx_skb;

unsigned long tx_state;

spinlock_t rx_lock;

};

声明：本文内容由网友自发贡献，不代表【wpsshop博客】立场，版权归原作者所有，本站不承担相应法律责任。如您发现有侵权的内容，请联系我们。转载请注明出处：https://www.wpsshop.cn/w/很楠不爱3/article/detail/326591