linux-kernel - [PATCH] Bluetooth: btusb: Add debugfs to force toggling remote wakeup

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Message-ID: <20240422152500.1.I8939e49084a6fef78496eb73edafdf3c2c4afbf4@changeid>
Date: Mon, 22 Apr 2024 15:25:01 +0800
From: Archie Pusaka <apusaka@...gle.com>
To: linux-bluetooth <linux-bluetooth@...r.kernel.org>, 
	Luiz Augusto von Dentz <luiz.dentz@...il.com>, Johan Hedberg <johan.hedberg@...il.com>, 
	Marcel Holtmann <marcel@...tmann.org>
Cc: CrosBT Upstreaming <chromeos-bluetooth-upstreaming@...omium.org>, 
	Archie Pusaka <apusaka@...omium.org>, Abhishek Pandit-Subedi <abhishekpandit@...gle.com>, 
	linux-kernel@...r.kernel.org
Subject: [PATCH] Bluetooth: btusb: Add debugfs to force toggling remote wakeup

From: Archie Pusaka <apusaka@...omium.org>

Sometimes we want the controller to not wake the host up, e.g. to
save the battery. Add some debugfs knobs to force the wake by BT
behavior.

Signed-off-by: Archie Pusaka <apusaka@...omium.org>
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@...gle.com>

---

 drivers/bluetooth/btusb.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 8bede0a335668..846b15fc3c04c 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -873,6 +873,9 @@ struct btusb_data {
 	unsigned cmd_timeout_cnt;
 
 	struct qca_dump_info qca_dump;
+
+	bool force_enable_remote_wake;
+	bool force_disable_remote_wake;
 };
 
 static void btusb_reset(struct hci_dev *hdev)
@@ -4596,6 +4599,10 @@ static int btusb_probe(struct usb_interface *intf,
 
 	debugfs_create_file("force_poll_sync", 0644, hdev->debugfs, data,
 			    &force_poll_sync_fops);
+	debugfs_create_bool("force_enable_remote_wake", 0644, hdev->debugfs,
+			    &data->force_enable_remote_wake);
+	debugfs_create_bool("force_disable_remote_wake", 0644, hdev->debugfs,
+			    &data->force_disable_remote_wake);
 
 	return 0;
 
@@ -4702,6 +4709,18 @@ static int btusb_suspend(struct usb_interface *intf, pm_message_t message)
 		}
 	}
 
+	if (!PMSG_IS_AUTO(message)) {
+		if (data->force_enable_remote_wake) {
+			data->udev->do_remote_wakeup = 1;
+			if (test_bit(BTUSB_WAKEUP_AUTOSUSPEND, &data->flags))
+				data->udev->reset_resume = 0;
+		} else if (data->force_disable_remote_wake) {
+			data->udev->do_remote_wakeup = 0;
+			if (test_bit(BTUSB_WAKEUP_AUTOSUSPEND, &data->flags))
+				data->udev->reset_resume = 1;
+		}
+	}
+
 	return 0;
 }
 
-- 
2.44.0.769.g3c40516874-goog