openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

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, if the host controller does not
drop VBUS during suspend, since in this case the device state is
preserved.

We chose not implemented reset_resume so that if the host controller
does drop VBUS the resume path will go through above the
disconnect/reconnect process since it is probably better to fix the
GPIO framework disconnect issue then to save and restore the device
state for every driver.

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Octavian Purdila 2015-01-19 13:51:36 +02:00 committed by Lee Jones
parent ee231aeed9
commit 3daa122d6b
1 changed files with 20 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/mfd/dln2.c
View File

@ -791,6 +791,24 @@ static int dln2_probe(struct usb_interface *interface,
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);