linux-kernel - [RFC 3/5] bluetooth: hci_mrvl: select firmwares to load by match data

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Date:   Wed, 26 Oct 2022 15:15:32 +0200
From:   Matthias Schiffer <matthias.schiffer@...tq-group.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Amitkumar Karwar <amitkarwar@...il.com>,
        Ganapathi Bhat <ganapathi017@...il.com>,
        Sharvari Harisangam <sharvari.harisangam@....com>,
        Xinming Hu <huxinming820@...il.com>,
        Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux@...tq-group.com,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>
Subject: [RFC 3/5] bluetooth: hci_mrvl: select firmwares to load by match data

Make the driver more generic by adding a driver info struct. We also add
support for devices without firmware (for example when the firmware is
loaded by the WLAN driver on a combined module).

Signed-off-by: Matthias Schiffer <matthias.schiffer@...tq-group.com>
---
 drivers/bluetooth/hci_mrvl.c | 57 +++++++++++++++++++++++++++++-------
 1 file changed, 46 insertions(+), 11 deletions(-)

diff --git a/drivers/bluetooth/hci_mrvl.c b/drivers/bluetooth/hci_mrvl.c
index fbc3f7c3a5c7..5d191687a34a 100644
--- a/drivers/bluetooth/hci_mrvl.c
+++ b/drivers/bluetooth/hci_mrvl.c
@@ -14,6 +14,7 @@
 #include <linux/module.h>
 #include <linux/tty.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/serdev.h>
 
 #include <net/bluetooth/bluetooth.h>
@@ -33,6 +34,20 @@ enum {
 	STATE_FW_REQ_PENDING,
 };
 
+struct mrvl_driver_info {
+	const char *firmware_helper;
+	const char *firmware;
+};
+
+static const struct mrvl_driver_info mrvl_driver_info_8897 = {
+	.firmware_helper = "mrvl/helper_uart_3000000.bin",
+	.firmware = "mrvl/uart8897_bt.bin",
+};
+
+/* Fallback for non-OF instances */
+static const struct mrvl_driver_info *const mrvl_driver_info_default =
+	&mrvl_driver_info_8897;
+
 struct mrvl_data {
 	struct sk_buff *rx_skb;
 	struct sk_buff_head txq;
@@ -44,6 +59,7 @@ struct mrvl_data {
 
 struct mrvl_serdev {
 	struct hci_uart hu;
+	const struct mrvl_driver_info *info;
 };
 
 struct hci_mrvl_pkt {
@@ -353,18 +369,29 @@ static int mrvl_load_firmware(struct hci_dev *hdev, const char *name)
 
 static int mrvl_setup(struct hci_uart *hu)
 {
+	const struct mrvl_driver_info *info;
 	int err;
 
-	hci_uart_set_flow_control(hu, true);
+	if (hu->serdev) {
+		struct mrvl_serdev *mrvldev = serdev_device_get_drvdata(hu->serdev);
 
-	err = mrvl_load_firmware(hu->hdev, "mrvl/helper_uart_3000000.bin");
-	if (err) {
-		bt_dev_err(hu->hdev, "Unable to download firmware helper");
-		return -EINVAL;
+		info = mrvldev->info;
+	} else {
+		info = mrvl_driver_info_default;
 	}
 
-	/* Let the final ack go out before switching the baudrate */
-	hci_uart_wait_until_sent(hu);
+	if (info->firmware_helper) {
+		hci_uart_set_flow_control(hu, true);
+
+		err = mrvl_load_firmware(hu->hdev, info->firmware_helper);
+		if (err) {
+			bt_dev_err(hu->hdev, "Unable to download firmware helper");
+			return -EINVAL;
+		}
+
+		/* Let the final ack go out before switching the baudrate */
+		hci_uart_wait_until_sent(hu);
+	}
 
 	if (hu->serdev)
 		serdev_device_set_baudrate(hu->serdev, 3000000);
@@ -373,9 +400,11 @@ static int mrvl_setup(struct hci_uart *hu)
 
 	hci_uart_set_flow_control(hu, false);
 
-	err = mrvl_load_firmware(hu->hdev, "mrvl/uart8897_bt.bin");
-	if (err)
-		return err;
+	if (info->firmware) {
+		err = mrvl_load_firmware(hu->hdev, info->firmware);
+		if (err)
+			return err;
+	}
 
 	return 0;
 }
@@ -401,6 +430,12 @@ static int mrvl_serdev_probe(struct serdev_device *serdev)
 	if (!mrvldev)
 		return -ENOMEM;
 
+	if (IS_ENABLED(CONFIG_OF)) {
+		mrvldev->info = of_device_get_match_data(&serdev->dev);
+		if (!mrvldev->info)
+			return -ENODEV;
+	}
+
 	mrvldev->hu.serdev = serdev;
 	serdev_device_set_drvdata(serdev, mrvldev);
 
@@ -416,7 +451,7 @@ static void mrvl_serdev_remove(struct serdev_device *serdev)
 
 #ifdef CONFIG_OF
 static const struct of_device_id mrvl_bluetooth_of_match[] = {
-	{ .compatible = "mrvl,88w8897" },
+	{ .compatible = "mrvl,88w8897", .data = &mrvl_driver_info_8897 },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, mrvl_bluetooth_of_match);
-- 
2.25.1