static int mtk_hci_wmt_sync()

in btmtkuart.c [149:240]

• 71 lines of code
• 12 McCabe index (conditional complexity)

static int mtk_hci_wmt_sync(struct hci_dev *hdev,
			    struct btmtk_hci_wmt_params *wmt_params)
{
	struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
	struct btmtk_hci_wmt_evt_funcc *wmt_evt_funcc;
	u32 hlen, status = BTMTK_WMT_INVALID;
	struct btmtk_hci_wmt_evt *wmt_evt;
	struct mtk_hci_wmt_cmd wc;
	struct mtk_wmt_hdr *hdr;
	int err;

	hlen = sizeof(*hdr) + wmt_params->dlen;
	if (hlen > 255) {
		err = -EINVAL;
		goto err_free_skb;
	}

	hdr = (struct mtk_wmt_hdr *)&wc;
	hdr->dir = 1;
	hdr->op = wmt_params->op;
	hdr->dlen = cpu_to_le16(wmt_params->dlen + 1);
	hdr->flag = wmt_params->flag;
	memcpy(wc.data, wmt_params->data, wmt_params->dlen);

	set_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);

	err = __hci_cmd_send(hdev, 0xfc6f, hlen, &wc);
	if (err < 0) {
		clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
		goto err_free_skb;
	}

	/* The vendor specific WMT commands are all answered by a vendor
	 * specific event and will not have the Command Status or Command
	 * Complete as with usual HCI command flow control.
	 *
	 * After sending the command, wait for BTMTKUART_TX_WAIT_VND_EVT
	 * state to be cleared. The driver specific event receive routine
	 * will clear that state and with that indicate completion of the
	 * WMT command.
	 */
	err = wait_on_bit_timeout(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT,
				  TASK_INTERRUPTIBLE, HCI_INIT_TIMEOUT);
	if (err == -EINTR) {
		bt_dev_err(hdev, "Execution of wmt command interrupted");
		clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
		goto err_free_skb;
	}

	if (err) {
		bt_dev_err(hdev, "Execution of wmt command timed out");
		clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
		err = -ETIMEDOUT;
		goto err_free_skb;
	}

	/* Parse and handle the return WMT event */
	wmt_evt = (struct btmtk_hci_wmt_evt *)bdev->evt_skb->data;
	if (wmt_evt->whdr.op != hdr->op) {
		bt_dev_err(hdev, "Wrong op received %d expected %d",
			   wmt_evt->whdr.op, hdr->op);
		err = -EIO;
		goto err_free_skb;
	}

	switch (wmt_evt->whdr.op) {
	case MTK_WMT_SEMAPHORE:
		if (wmt_evt->whdr.flag == 2)
			status = BTMTK_WMT_PATCH_UNDONE;
		else
			status = BTMTK_WMT_PATCH_DONE;
		break;
	case MTK_WMT_FUNC_CTRL:
		wmt_evt_funcc = (struct btmtk_hci_wmt_evt_funcc *)wmt_evt;
		if (be16_to_cpu(wmt_evt_funcc->status) == 0x404)
			status = BTMTK_WMT_ON_DONE;
		else if (be16_to_cpu(wmt_evt_funcc->status) == 0x420)
			status = BTMTK_WMT_ON_PROGRESS;
		else
			status = BTMTK_WMT_ON_UNDONE;
		break;
	}

	if (wmt_params->status)
		*wmt_params->status = status;

err_free_skb:
	kfree_skb(bdev->evt_skb);
	bdev->evt_skb = NULL;

	return err;
}