linux-kernel - [PATCH 2/2] Bluetooth: btusb: Add reset

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Date:	Mon,  1 Jun 2015 18:14:42 -0700
From:	Laura Abbott <labbott@...oraproject.org>
To:	Marcel Holtmann <marcel@...tmann.org>
Cc:	Laura Abbott <labbott@...oraproject.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Takashi Iwai <tiwai@...e.de>, Oliver Neukum <oneukum@...e.com>,
	Ming Lei <ming.lei@...onical.com>,
	"David S. Miller" <davem@...emloft.net>,
	Johan Hedberg <johan.hedberg@...il.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	"Gustavo F. Padovan" <gustavo@...ovan.org>,
	<linux-bluetooth@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: [PATCH 2/2] Bluetooth: btusb: Add reset_resume function


Some USB hubs may lose power across suspend/resume.
Add a reset_resume callback to properly reset those bluetoot devices.

Signed-off-by: Laura Abbott <labbott@...oraproject.org>
---
Now the setup function is called again with the HCI_RESET_RESUME
flag set. The various functions could then use that RESET_RESUME
flag to determine if loading the firmware is appropriate or not.
---
 drivers/bluetooth/btusb.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 3c10d4d..34884cf 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3382,6 +3382,21 @@ done:
 
 	return err;
 }
+
+static int btusb_reset_resume(struct usb_interface *intf)
+{
+	struct btusb_data *data = usb_get_intfdata(intf);
+	struct hci_dev *hdev = data->hdev;
+	int ret;
+
+	BT_DBG("intf %p", intf);
+
+	ret = btusb_resume(intf);
+	if (ret)
+		return ret;
+
+	return hci_reset_resume_dev(hdev);
+}
 #endif
 
 static struct usb_driver btusb_driver = {
@@ -3391,6 +3406,7 @@ static struct usb_driver btusb_driver = {
 #ifdef CONFIG_PM
 	.suspend	= btusb_suspend,
 	.resume		= btusb_resume,
+	.reset_resume	= btusb_reset_resume,
 #endif
 	.id_table	= btusb_table,
 	.supports_autosuspend = 1,
-- 
2.4.1

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