linux-kernel - [PATCH v2 4/4] mfd: dln2: add suspend/resume functionality

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Date:	Tue, 16 Dec 2014 17:57:15 +0200
From:	Octavian Purdila <octavian.purdila@...el.com>
To:	linus.walleij@...aro.org, lee.jones@...aro.org
Cc:	johan@...nel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
	Octavian Purdila <octavian.purdila@...el.com>
Subject: [PATCH v2 4/4] mfd: dln2: add suspend/resume functionality

Without suspend/resume functionality in the USB driver the USB core
will disconnect and reconnect the DLN2 port and because the GPIO
framework does not yet support removal of an in-use controller a
suspend/resume operation will result in a crash.

This patch provides suspend and resume functions for the DLN2 driver
so that the above scenario is avoided.

Signed-off-by: Octavian Purdila <octavian.purdila@...el.com>
---
 drivers/mfd/dln2.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/mfd/dln2.c b/drivers/mfd/dln2.c
index 75358d2..f9c4a0b 100644
--- a/drivers/mfd/dln2.c
+++ b/drivers/mfd/dln2.c
@@ -791,6 +791,24 @@ out_free:
 	return ret;
 }
 
+static int dln2_suspend(struct usb_interface *iface, pm_message_t message)
+{
+	struct dln2_dev *dln2 = usb_get_intfdata(iface);
+
+	dln2_stop(dln2);
+
+	return 0;
+}
+
+static int dln2_resume(struct usb_interface *iface)
+{
+	struct dln2_dev *dln2 = usb_get_intfdata(iface);
+
+	dln2->disconnect = false;
+
+	return dln2_start_rx_urbs(dln2, GFP_NOIO);
+}
+
 static const struct usb_device_id dln2_table[] = {
 	{ USB_DEVICE(0xa257, 0x2013) },
 	{ }
@@ -803,6 +821,8 @@ static struct usb_driver dln2_driver = {
 	.probe = dln2_probe,
 	.disconnect = dln2_disconnect,
 	.id_table = dln2_table,
+	.suspend = dln2_suspend,
+	.resume = dln2_resume,
 };
 
 module_usb_driver(dln2_driver);
-- 
1.9.1

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