[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 <stern@rowland.harvard.edu>
Signed-off-by: Nick Sillik <n.sillik@temple.edu>
Signed-off-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/usb/storage/onetouch.c b/drivers/usb/storage/onetouch.c
index 89401a59f952..55ee2d36d585 100644
--- a/drivers/usb/storage/onetouch.c
+++ b/drivers/usb/storage/onetouch.c
@@ -52,6 +52,7 @@ struct usb_onetouch {
         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)
@@ -89,6 +90,7 @@ static int usb_onetouch_open(struct input_dev *dev)
 {
         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");
@@ -103,8 +105,30 @@ static void usb_onetouch_close(struct input_dev *dev)
         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)
 {
         struct usb_device *udev = ss->pusb_dev;
@@ -185,6 +209,9 @@ 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);