Add aio_write to bluetooth driver

#include <linux/delay.h>

#include <linux/device.h>

#include <linux/printk.h>

#include <linux/uio.h>

#include "osal_typedef.h"

#include "stp_exp.h"

	return retval;

}

ssize_t BT_aio_write(struct kiocb *iocb, const struct iovec *iov, unsigned long nr_segs, loff_t f_pos)

{

	INT32 retval = 0;

	size_t count = iov_length(iov, nr_segs);

	down(&wr_mtx);

	BT_DBG_FUNC("%s: count %zd pos %lld\n", __func__, count, f_pos);

	if (rstflag) {

		BT_ERR_FUNC("whole chip reset occurs! rstflag=%d\n", rstflag);

		retval = -EIO;

		goto OUT;

	}

	if (count > 0) {

		unsigned long seg = nr_segs;

		size_t ofs = 0;

		if (count > BT_BUFFER_SIZE) {

			BT_ERR_FUNC("write count %zd exceeds max buffer size %d", count, BT_BUFFER_SIZE);

			retval = -EINVAL;

			goto OUT;

		}

		while (seg > 0) {

			if (copy_from_user(&o_buf[ofs], iov->iov_base, iov->iov_len)) {

				retval = -EFAULT;

				goto OUT;

			}

			ofs += iov->iov_len;

			iov++;

			seg--;

		}

		BT_DBG_FUNC("%s: before mtk_wcn_stp_send_data ofs %zd\n", __func__, ofs);

		retval = mtk_wcn_stp_send_data(o_buf, count, BT_TASK_INDX);

		if (retval < 0)

			BT_ERR_FUNC("mtk_wcn_stp_send_data fail, retval %d\n", retval);

		else if (retval == 0) {

			/* Device cannot process data in time, STP queue is full and no space is available for write,

			 * native program should not call write with no delay.

			 */

			BT_ERR_FUNC("write count %zd, sent bytes %d, no space is available!\n", count, retval);

			retval = -EAGAIN;

		} else

			BT_DBG_FUNC("write count %zd, sent bytes %d\n", count, retval);

	}

OUT:

	up(&wr_mtx);

	return retval;

}

ssize_t BT_read(struct file *filp, char __user *buf, size_t count, loff_t *f_pos)

{

	static int chip_reset_count;

	.release = BT_close,

	.read = BT_read,

	.write = BT_write,

	.aio_write = BT_aio_write,

	/* .ioctl = BT_ioctl, */

	.unlocked_ioctl = BT_unlocked_ioctl,

	.compat_ioctl = BT_compat_ioctl,