static int ag6xx_setup()

in hci_ag6xx.c [151:298]

• 99 lines of code
• 14 McCabe index (conditional complexity)

static int ag6xx_setup(struct hci_uart *hu)
{
	struct hci_dev *hdev = hu->hdev;
	struct sk_buff *skb;
	struct intel_version ver;
	const struct firmware *fw;
	const u8 *fw_ptr;
	char fwname[64];
	bool patched = false;
	int err;

	hu->hdev->set_diag = btintel_set_diag;
	hu->hdev->set_bdaddr = btintel_set_bdaddr;

	err = btintel_enter_mfg(hdev);
	if (err)
		return err;

	err = btintel_read_version(hdev, &ver);
	if (err)
		return err;

	btintel_version_info(hdev, &ver);

	/* The hardware platform number has a fixed value of 0x37 and
	 * for now only accept this single value.
	 */
	if (ver.hw_platform != 0x37) {
		bt_dev_err(hdev, "Unsupported Intel hardware platform: 0x%X",
			   ver.hw_platform);
		return -EINVAL;
	}

	/* Only the hardware variant iBT 2.1 (AG6XX) is supported by this
	 * firmware setup method.
	 */
	if (ver.hw_variant != 0x0a) {
		bt_dev_err(hdev, "Unsupported Intel hardware variant: 0x%x",
			   ver.hw_variant);
		return -EINVAL;
	}

	snprintf(fwname, sizeof(fwname), "intel/ibt-hw-%x.%x.bddata",
		 ver.hw_platform, ver.hw_variant);

	err = request_firmware(&fw, fwname, &hdev->dev);
	if (err < 0) {
		bt_dev_err(hdev, "Failed to open Intel bddata file: %s (%d)",
			   fwname, err);
		goto patch;
	}

	bt_dev_info(hdev, "Applying bddata (%s)", fwname);

	skb = __hci_cmd_sync_ev(hdev, 0xfc2f, fw->size, fw->data,
				HCI_EV_CMD_STATUS, HCI_CMD_TIMEOUT);
	if (IS_ERR(skb)) {
		bt_dev_err(hdev, "Applying bddata failed (%ld)", PTR_ERR(skb));
		release_firmware(fw);
		return PTR_ERR(skb);
	}
	kfree_skb(skb);

	release_firmware(fw);

patch:
	/* If there is no applied patch, fw_patch_num is always 0x00. In other
	 * cases, current firmware is already patched. No need to patch it.
	 */
	if (ver.fw_patch_num) {
		bt_dev_info(hdev, "Device is already patched. patch num: %02x",
			    ver.fw_patch_num);
		patched = true;
		goto complete;
	}

	snprintf(fwname, sizeof(fwname),
		 "intel/ibt-hw-%x.%x.%x-fw-%x.%x.%x.%x.%x.pbn",
		 ver.hw_platform, ver.hw_variant, ver.hw_revision,
		 ver.fw_variant,  ver.fw_revision, ver.fw_build_num,
		 ver.fw_build_ww, ver.fw_build_yy);

	err = request_firmware(&fw, fwname, &hdev->dev);
	if (err < 0) {
		bt_dev_err(hdev, "Failed to open Intel patch file: %s(%d)",
			   fwname, err);
		goto complete;
	}
	fw_ptr = fw->data;

	bt_dev_info(hdev, "Patching firmware file (%s)", fwname);

	/* PBN patch file contains a list of binary patches to be applied on top
	 * of the embedded firmware. Each patch entry header contains the target
	 * address and patch size.
	 *
	 * Patch entry:
	 * | addr(le) | patch_len(le) | patch_data |
	 * | 4 Bytes  |    4 Bytes    |   n Bytes  |
	 *
	 * PBN file is terminated by a patch entry whose address is 0xffffffff.
	 */
	while (fw->size > fw_ptr - fw->data) {
		struct pbn_entry *pbn = (void *)fw_ptr;
		u32 addr, plen;

		if (pbn->addr == 0xffffffff) {
			bt_dev_info(hdev, "Patching complete");
			patched = true;
			break;
		}

		addr = le32_to_cpu(pbn->addr);
		plen = le32_to_cpu(pbn->plen);

		if (fw->data + fw->size <= pbn->data + plen) {
			bt_dev_info(hdev, "Invalid patch len (%d)", plen);
			break;
		}

		bt_dev_info(hdev, "Patching %td/%zu", (fw_ptr - fw->data),
			    fw->size);

		err = intel_mem_write(hdev, addr, plen, pbn->data);
		if (err) {
			bt_dev_err(hdev, "Patching failed");
			break;
		}

		fw_ptr = pbn->data + plen;
	}

	release_firmware(fw);

complete:
	/* Exit manufacturing mode and reset */
	err = btintel_exit_mfg(hdev, true, patched);
	if (err)
		return err;

	/* Set the event mask for Intel specific vendor events. This enables
	 * a few extra events that are useful during general operation.
	 */
	btintel_set_event_mask_mfg(hdev, false);

	btintel_check_bdaddr(hdev);
	return 0;
}