linux-kernel - [PATCH] Bluetooth: Add default wakeup callback for HCI UART driver

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Message-Id: <20220704183320.1.Ib7423c21f71003643a5bbe954ed0538ee532b29c@changeid>
Date:   Mon,  4 Jul 2022 18:33:24 +0800
From:   Ying Hsu <yinghsu@...omium.org>
To:     marcel@...tmann.org
Cc:     chromeos-bluetooth-upstreaming@...omium.org,
        Ying Hsu <yinghsu@...omium.org>,
        Alain Michaud <alainm@...omium.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] Bluetooth: Add default wakeup callback for HCI UART driver

Bluetooth HCI devices indicate if they are able to wakeup in the wakeup
callback since 'commit 4539ca67fe8e ("Bluetooth: Rename driver
.prevent_wake to .wakeup")'. This patch adds a default wakeup callback
for Bluetooth HCI UAR devices. It assumes Bluetooth HCI UART devices are
wakeable for backward compatibility. For those who need a customized
behavior, one can override it before calling hci_uart_register_device().

Fixes: 4539ca67fe8e ("Bluetooth: Rename driver .prevent_wake to .wakeup")
Signed-off-by: Ying Hsu <yinghsu@...omium.org>
Reviewed-by: Alain Michaud <alainm@...omium.org>
---
Tested this commit on trogdor (wcn399x) and hayato (RTL8822-UART).
For platforms with QCA UART connectivity, such as trogdor, we revert the
commit c1a74160eaf1 ("Bluetooth: hci_qca: Add device_may_wakeup
support") downstream as qca_wakeup() returns false and breaks wake-on-bt.

 drivers/bluetooth/hci_serdev.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/bluetooth/hci_serdev.c b/drivers/bluetooth/hci_serdev.c
index 4cda890ce647..c0e5f42ec6b7 100644
--- a/drivers/bluetooth/hci_serdev.c
+++ b/drivers/bluetooth/hci_serdev.c
@@ -231,6 +231,15 @@ static int hci_uart_setup(struct hci_dev *hdev)
 	return 0;
 }
 
+/* Check if the device is wakeable */
+static bool hci_uart_wakeup(struct hci_dev *hdev)
+{
+	/* HCI UART devices are assumed to be wakeable by default.
+	 * Implement wakeup callback to override this behavior.
+	 */
+	return true;
+}
+
 /** hci_uart_write_wakeup - transmit buffer wakeup
  * @serdev: serial device
  *
@@ -342,6 +351,8 @@ int hci_uart_register_device(struct hci_uart *hu,
 	hdev->flush = hci_uart_flush;
 	hdev->send  = hci_uart_send_frame;
 	hdev->setup = hci_uart_setup;
+	if (!hdev->wakeup)
+		hdev->wakeup = hci_uart_wakeup;
 	SET_HCIDEV_DEV(hdev, &hu->serdev->dev);
 
 	if (test_bit(HCI_UART_NO_SUSPEND_NOTIFIER, &hu->flags))
-- 
2.37.0.rc0.161.g10f37bed90-goog