Bluetooth: btusb: Refactor of firmware download flow for Intel conrollers

Address the scalability to support new generation Intel controller with
respect to readability and enhancement to new firmware download sequence
Signed-off-by: Kiran K <kiran.k@intel.com>
Reviewed-by: Chethan T N <chethan.tumkur.narayan@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/btusb.c

@@ -511,7 +511,6 @@ struct btusb_data {
 	unsigned cmd_timeout_cnt;
 };
 
-
 static void btusb_intel_cmd_timeout(struct hci_dev *hdev)
 {
 	struct btusb_data *data = hci_get_drvdata(hdev);
@@ -2278,46 +2277,25 @@ static bool btusb_setup_intel_new_get_fw_name(struct intel_version *ver,
 	return true;
 }
 
-static int btusb_setup_intel_new(struct hci_dev *hdev)
+static int btusb_intel_download_firmware(struct hci_dev *hdev,
+					 struct intel_version *ver,
+					 struct intel_boot_params *params)
 {
-	struct btusb_data *data = hci_get_drvdata(hdev);
-	struct intel_version ver;
-	struct intel_boot_params params;
-	struct intel_debug_features features;
 	const struct firmware *fw;
 	u32 boot_param;
 	char fwname[64];
-	ktime_t calltime, delta, rettime;
-	unsigned long long duration;
 	int err;
+	struct btusb_data *data = hci_get_drvdata(hdev);
 
-	BT_DBG("%s", hdev->name);
-
-	/* Set the default boot parameter to 0x0 and it is updated to
-	 * SKU specific boot parameter after reading Intel_Write_Boot_Params
-	 * command while downloading the firmware.
-	 */
-	boot_param = 0x00000000;
-
-	calltime = ktime_get();
-
-	/* Read the Intel version information to determine if the device
-	 * is in bootloader mode or if it already has operational firmware
-	 * loaded.
-	 */
-	err = btintel_read_version(hdev, &ver);
-	if (err) {
-		bt_dev_err(hdev, "Intel Read version failed (%d)", err);
-		btintel_reset_to_bootloader(hdev);
-		return err;
-	}
+	if (!ver || !params)
+		return -EINVAL;
 
 	/* The hardware platform number has a fixed value of 0x37 and
 	 * for now only accept this single value.
 	 */
-	if (ver.hw_platform != 0x37) {
+	if (ver->hw_platform != 0x37) {
 		bt_dev_err(hdev, "Unsupported Intel hardware platform (%u)",
-			   ver.hw_platform);
+			   ver->hw_platform);
 		return -EINVAL;
 	}
 
@@ -2327,7 +2305,7 @@ static int btusb_setup_intel_new(struct hci_dev *hdev)
 	 * This check has been put in place to ensure correct forward
 	 * compatibility options when newer hardware variants come along.
 	 */
-	switch (ver.hw_variant) {
+	switch (ver->hw_variant) {
 	case 0x0b:	/* SfP */
 	case 0x0c:	/* WsP */
 	case 0x11:	/* JfP */
@@ -2337,11 +2315,11 @@ static int btusb_setup_intel_new(struct hci_dev *hdev)
 		break;
 	default:
 		bt_dev_err(hdev, "Unsupported Intel hardware variant (%u)",
-			   ver.hw_variant);
+			   ver->hw_variant);
 		return -EINVAL;
 	}
 
-	btintel_version_info(hdev, &ver);
+	btintel_version_info(hdev, ver);
 
 	/* The firmware variant determines if the device is in bootloader
 	 * mode or is running operational firmware. The value 0x06 identifies
@@ -2356,25 +2334,25 @@ static int btusb_setup_intel_new(struct hci_dev *hdev)
 	 * It is not possible to use the Secure Boot Parameters in this
 	 * case since that command is only available in bootloader mode.
 	 */
-	if (ver.fw_variant == 0x23) {
+	if (ver->fw_variant == 0x23) {
 		clear_bit(BTUSB_BOOTLOADER, &data->flags);
 		btintel_check_bdaddr(hdev);
-		goto finish;
+		return 0;
 	}
 
 	/* If the device is not in bootloader mode, then the only possible
 	 * choice is to return an error and abort the device initialization.
 	 */
-	if (ver.fw_variant != 0x06) {
+	if (ver->fw_variant != 0x06) {
 		bt_dev_err(hdev, "Unsupported Intel firmware variant (%u)",
-			   ver.fw_variant);
+			   ver->fw_variant);
 		return -ENODEV;
 	}
 
 	/* Read the secure boot parameters to identify the operating
 	 * details of the bootloader.
 	 */
-	err = btintel_read_boot_params(hdev, &params);
+	err = btintel_read_boot_params(hdev, params);
 	if (err)
 		return err;
 
@@ -2382,16 +2360,16 @@ static int btusb_setup_intel_new(struct hci_dev *hdev)
 	 * with a command complete event. If the boot parameters indicate
 	 * that this bootloader does not send them, then abort the setup.
 	 */
-	if (params.limited_cce != 0x00) {
+	if (params->limited_cce != 0x00) {
 		bt_dev_err(hdev, "Unsupported Intel firmware loading method (%u)",
-			   params.limited_cce);
+			   params->limited_cce);
 		return -EINVAL;
 	}
 
 	/* If the OTP has no valid Bluetooth device address, then there will
 	 * also be no valid address for the operational firmware.
 	 */
-	if (!bacmp(&params.otp_bdaddr, BDADDR_ANY)) {
+	if (!bacmp(&params->otp_bdaddr, BDADDR_ANY)) {
 		bt_dev_info(hdev, "No device address configured");
 		set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
 	}
@@ -2417,7 +2395,7 @@ static int btusb_setup_intel_new(struct hci_dev *hdev)
 	 * ibt-<hw_variant>-<hw_revision>-<fw_revision>.sfi.
 	 *
 	 */
-	err = btusb_setup_intel_new_get_fw_name(&ver, &params, fwname,
+	err = btusb_setup_intel_new_get_fw_name(ver, params, fwname,
 						sizeof(fwname), "sfi");
 	if (!err) {
 		bt_dev_err(hdev, "Unsupported Intel firmware naming");
@@ -2432,16 +2410,6 @@ static int btusb_setup_intel_new(struct hci_dev *hdev)
 
 	bt_dev_info(hdev, "Found device firmware: %s", fwname);
 
-	/* Save the DDC file name for later use to apply once the firmware
-	 * downloading is done.
-	 */
-	err = btusb_setup_intel_new_get_fw_name(&ver, &params, fwname,
-						sizeof(fwname), "ddc");
-	if (!err) {
-		bt_dev_err(hdev, "Unsupported Intel firmware naming");
-		return -EINVAL;
-	}
-
 	if (fw->size < 644) {
 		bt_dev_err(hdev, "Invalid size of firmware file (%zu)",
 			   fw->size);
@@ -2496,18 +2464,58 @@ static int btusb_setup_intel_new(struct hci_dev *hdev)
 		goto done;
 	}
 
+done:
+	release_firmware(fw);
+	return err;
+}
+
+static int btusb_setup_intel_new(struct hci_dev *hdev)
+{
+	struct btusb_data *data = hci_get_drvdata(hdev);
+	struct intel_version ver;
+	struct intel_boot_params params;
+	u32 boot_param;
+	char ddcname[64];
+	ktime_t calltime, delta, rettime;
+	unsigned long long duration;
+	int err;
+	struct intel_debug_features features;
+
+	BT_DBG("%s", hdev->name);
+
+	/* Set the default boot parameter to 0x0 and it is updated to
+	 * SKU specific boot parameter after reading Intel_Write_Boot_Params
+	 * command while downloading the firmware.
+	 */
+	boot_param = 0x00000000;
+
+	calltime = ktime_get();
+
+	/* Read the Intel version information to determine if the device
+	 * is in bootloader mode or if it already has operational firmware
+	 * loaded.
+	 */
+	err = btintel_read_version(hdev, &ver);
+	if (err) {
+		bt_dev_err(hdev, "Intel Read version failed (%d)", err);
+		btintel_reset_to_bootloader(hdev);
+		return err;
+	}
+
+	err = btusb_intel_download_firmware(hdev, &ver, &params);
+	if (err)
+		return err;
+
+	/* controller is already having an operational firmware */
+	if (ver.fw_variant == 0x23)
+		goto finish;
+
 	rettime = ktime_get();
 	delta = ktime_sub(rettime, calltime);
 	duration = (unsigned long long) ktime_to_ns(delta) >> 10;
 
 	bt_dev_info(hdev, "Firmware loaded in %llu usecs", duration);
 
-done:
-	release_firmware(fw);
-
-	if (err < 0)
-		return err;
-
 	calltime = ktime_get();
 
 	set_bit(BTUSB_BOOTING, &data->flags);
@@ -2551,13 +2559,20 @@ static int btusb_setup_intel_new(struct hci_dev *hdev)
 
 	clear_bit(BTUSB_BOOTLOADER, &data->flags);
 
-	/* Once the device is running in operational mode, it needs to apply
-	 * the device configuration (DDC) parameters.
-	 *
-	 * The device can work without DDC parameters, so even if it fails
-	 * to load the file, no need to fail the setup.
-	 */
-	btintel_load_ddc_config(hdev, fwname);
+	err = btusb_setup_intel_new_get_fw_name(&ver, &params, ddcname,
+						sizeof(ddcname), "ddc");
+
+	if (!err) {
+		bt_dev_err(hdev, "Unsupported Intel firmware naming");
+	} else {
+		/* Once the device is running in operational mode, it needs to
+		 * apply the device configuration (DDC) parameters.
+		 *
+		 * The device can work without DDC parameters, so even if it
+		 * fails to load the file, no need to fail the setup.
+		 */
+		btintel_load_ddc_config(hdev, ddcname);
+	}
 
 	/* Read the Intel supported features and if new exception formats
 	 * supported, need to load the additional DDC config to enable.