[PATCH] USB Storage: make OneTouch PM-aware

The OneTouch subdriver submits its own interrupt URB for notifications
about button presses. Consequently it needs to know about suspend and
resume events, so it can cancel or restart the URB.

This patch (as593) adds a hook to struct us_data, to be used for
notifying subdrivers about Power Management events, and it implements
the hook in the OneTouch driver.

Signed-off-by: Alan Stern <[e-mail]>
Signed-off-by: Nick Sillik <[e-mail]>
Signed-off-by: Matthew Dharm <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/storage/onetouch.c

···
 	struct urb *irq;	/* urb for interrupt in report */
 	unsigned char *data;	/* input data */
 	dma_addr_t data_dma;
+	unsigned int is_open:1;
 };
 
 static void usb_onetouch_irq(struct urb *urb, struct pt_regs *regs)
···
 {
 	struct usb_onetouch *onetouch = dev->private;
 
+	onetouch->is_open = 1;
 	onetouch->irq->dev = onetouch->udev;
 	if (usb_submit_urb(onetouch->irq, GFP_KERNEL)) {
 		err("usb_submit_urb failed");
···
 	struct usb_onetouch *onetouch = dev->private;
 
 	usb_kill_urb(onetouch->irq);
+	onetouch->is_open = 0;
 }
+
+#ifdef CONFIG_PM
+static void usb_onetouch_pm_hook(struct us_data *us, int action)
+{
+	struct usb_onetouch *onetouch = (struct usb_onetouch *) us->extra;
+
+	if (onetouch->is_open) {
+		switch (action) {
+		case US_SUSPEND:
+			usb_kill_urb(onetouch->irq);
+			break;
+		case US_RESUME:
+			if (usb_submit_urb(onetouch->irq, GFP_KERNEL) != 0)
+				err("usb_submit_urb failed");
+			break;
+		default:
+			break;
+		}
+	}
+}
+#endif /* CONFIG_PM */
 
 int onetouch_connect_input(struct us_data *ss)
 {
···
 
 	ss->extra_destructor = onetouch_release_input;
 	ss->extra = onetouch;
+#ifdef CONFIG_PM
+	ss->suspend_resume_hook = usb_onetouch_pm_hook;
+#endif
 
 	input_register_device(onetouch->dev);
 

drivers/usb/storage/usb.c

···
 	down(&us->dev_semaphore);
 
 	US_DEBUGP("%s\n", __FUNCTION__);
+	if (us->suspend_resume_hook)
+		(us->suspend_resume_hook)(us, US_SUSPEND);
 	iface->dev.power.power_state.event = message.event;
 
 	/* When runtime PM is working, we'll set a flag to indicate
···
 	down(&us->dev_semaphore);
 
 	US_DEBUGP("%s\n", __FUNCTION__);
+	if (us->suspend_resume_hook)
+		(us->suspend_resume_hook)(us, US_RESUME);
 	iface->dev.power.power_state.event = PM_EVENT_ON;
 
 	up(&us->dev_semaphore);

drivers/usb/storage/usb.h

···
 typedef int (*trans_cmnd)(struct scsi_cmnd *, struct us_data*);
 typedef int (*trans_reset)(struct us_data*);
 typedef void (*proto_cmnd)(struct scsi_cmnd*, struct us_data*);
-typedef void (*extra_data_destructor)(void *);	 /* extra data destructor   */
+typedef void (*extra_data_destructor)(void *);	/* extra data destructor */
+typedef void (*pm_hook)(struct us_data *, int);	/* power management hook */
+
+#define US_SUSPEND	0
+#define US_RESUME	1
 
 /* we allocate one of these for every device that we remember */
 struct us_data {
···
 	/* subdriver information */
 	void			*extra;		 /* Any extra data          */
 	extra_data_destructor	extra_destructor;/* extra data destructor   */
+#ifdef CONFIG_PM
+	pm_hook			suspend_resume_hook;
+#endif
 };
 
 /* Convert between us_data and the corresponding Scsi_Host */