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Input: usbtouchscreen - implement runtime power management 

This implement USB autosuspend while the device is opened for
devices that do remote wakeup with a fallback to open/close for
those devices that don't. Devices that require the host to
constantly poll them are never autosuspended.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Tested-by: Petr Štetiar <ynezz@true.cz>
Tested-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Oliver Neukum 2010-07-15 09:19:51 -07:00 committed by Dmitry Torokhov
parent ed4299e1b1
commit 5d9efc59e6
1 changed files with 24 additions and 3 deletions
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27
drivers/input/touchscreen/usbtouchscreen.c
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@ -1268,6 +1268,7 @@ static void usbtouch_irq(struct urb *urb)
usbtouch->type->process_pkt(usbtouch, usbtouch->data, urb->actual_length);
exit:
usb_mark_last_busy(interface_to_usbdev(usbtouch->interface));
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval)
err("%s - usb_submit_urb failed with result: %d",
@ -1277,23 +1278,39 @@ exit:
static int usbtouch_open(struct input_dev *input)
{
struct usbtouch_usb *usbtouch = input_get_drvdata(input);
int r;
usbtouch->irq->dev = interface_to_usbdev(usbtouch->interface);
r = usb_autopm_get_interface(usbtouch->interface) ? -EIO : 0;
if (r < 0)
goto out;
if (!usbtouch->type->irq_always) {
if (usb_submit_urb(usbtouch->irq, GFP_KERNEL))
return -EIO;
if (usb_submit_urb(usbtouch->irq, GFP_KERNEL)) {
r = -EIO;
goto out_put;
}
}
return 0;
usbtouch->interface->needs_remote_wakeup = 1;
out_put:
usb_autopm_put_interface(usbtouch->interface);
out:
return r;
}
static void usbtouch_close(struct input_dev *input)
{
struct usbtouch_usb *usbtouch = input_get_drvdata(input);
int r;
if (!usbtouch->type->irq_always)
usb_kill_urb(usbtouch->irq);
r = usb_autopm_get_interface(usbtouch->interface);
usbtouch->interface->needs_remote_wakeup = 0;
if (!r)
usb_autopm_put_interface(usbtouch->interface);
}
static int usbtouch_suspend
@ -1457,8 +1474,11 @@ static int usbtouch_probe(struct usb_interface *intf,
usb_set_intfdata(intf, usbtouch);
if (usbtouch->type->irq_always) {
/* this can't fail */
usb_autopm_get_interface(intf);
err = usb_submit_urb(usbtouch->irq, GFP_KERNEL);
if (err) {
usb_autopm_put_interface(intf);
err("%s - usb_submit_urb failed with result: %d",
__func__, err);
goto out_unregister_input;
@ -1512,6 +1532,7 @@ static struct usb_driver usbtouch_driver = {
.suspend = usbtouch_suspend,
.resume = usbtouch_resume,
.id_table = usbtouch_devices,
.supports_autosuspend = 1,
};
static int __init usbtouch_init(void)