[PATCH 5.18 0500/1095] Bluetooth: Add default wakeup callback for HCI UART driver

Greg Kroah-Hartman
2022-08-15T21:24:29Z

From: Ying Hsu <yinghsu@chromium.org>

[ Upstream commit bee5395ced44c5a312348557eb2dfb0c2a7bfaa2 ]

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@chromium.org>
Reviewed-by: Alain Michaud <alainm@chromium.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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))
--
2.35.1