[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>

diff --git a/drivers/usb/storage/onetouch.c b/drivers/usb/storage/onetouch.c
index 89401a59f95273cc904688098c9179d082e78658..55ee2d36d585824a589113e29cea2f0e94a1bebc 100644 (file)
--- 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);
 

diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
index 356f471ba83befaa31fbfe3f2f424976127b26d1..ca02ae97be8643bfe43e11bfc552ce9b69a4ff95 100644 (file)
--- a/drivers/usb/storage/usb.c
+++ b/drivers/usb/storage/usb.c
@@ -188,6 +188,8 @@ static int storage_suspend(struct usb_interface *iface, pm_message_t message)
        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
@@ -204,6 +206,8 @@ static int storage_resume(struct usb_interface *iface)
        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);

diff --git a/drivers/usb/storage/usb.h b/drivers/usb/storage/usb.h
index 0cd1eebc4497730ba2a5f33743cbb5b9e71b5615..7259fd1f6b0d2672a10567d41a3037b741903dda 100644 (file)
--- a/drivers/usb/storage/usb.h
+++ b/drivers/usb/storage/usb.h
@@ -93,7 +93,11 @@ struct us_unusual_dev {
 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 {
@@ -149,6 +153,9 @@ 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 */