autosuspend for appletouch driver

[Oliver Neukum]

Hi,

here's the first version of a patch to do autosuspend for the appletouch
driver. It is against 2.6.23-rc6. It compiles. More I can't guarantee.

        Regards
                Oliver

-----
--- a/drivers/input/mouse/appletouch.c  2007-09-20 14:14:46.000000000 +0200
+++ b/drivers/input/mouse/appletouch.c  2007-09-21 10:39:21.000000000 +0200
@@ -140,6 +140,7 @@ MODULE_DEVICE_TABLE (usb, atp_table);
 struct atp {
        char                    phys[64];
        struct usb_device *     udev;           /* usb device */
+       struct usb_interface    intf;           /* usb interface */
        struct urb *            urb;            /* usb request block */
        signed char *           data;           /* transferred data */
        int                     open;           /* non-zero if opened */
@@ -324,6 +325,11 @@ static inline void atp_report_fingers(st
        input_report_key(input, BTN_TOOL_TRIPLETAP, fingers > 2);
 }
 
+static void atp_mark_busy(struct atp *dev)
+{
+       usb_mark_last_busy(dev->udev);
+}
+
 static void atp_complete(struct urb* urb)
 {
        int x, y, x_z, y_z, x_f, y_f;
@@ -362,6 +368,9 @@ static void atp_complete(struct urb* urb
                goto exit;
        }
 
+       /* mark busy for autosuspend purposes */
+       atp_mark_busy(dev);
+
        /* reorder the sensors values */
        if (atp_is_geyser_3(dev)) {
                memset(dev->xy_cur, 0, sizeof(dev->xy_cur));
@@ -528,12 +537,20 @@ exit:
 static int atp_open(struct input_dev *input)
 {
        struct atp *dev = input_get_drvdata(input);
+       int rv = 0;
 
-       if (usb_submit_urb(dev->urb, GFP_ATOMIC))
+       if (usb_autopm_get_interface(dev->intf) < 0)
                return -EIO;
+       dev->intf->needs_remote_wakeup = 1;
+       if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
+               rv = -EIO;
+               dev->intf->needs_remote_wakeup = 0;
+               goto err;
 
        dev->open = 1;
-       return 0;
+err:
+       usb_autopm_put_interface(dev->intf);
+       return rv;
 }
 
 static void atp_close(struct input_dev *input)
@@ -543,6 +560,7 @@ static void atp_close(struct input_dev *
        usb_kill_urb(dev->urb);
        cancel_work_sync(&dev->work);
        dev->open = 0;
+       dev->intf->needs_remote_wakeup = 0;
 }
 
 static int atp_probe(struct usb_interface *iface, const struct usb_device_id 
*id)
@@ -580,6 +598,7 @@ static int atp_probe(struct usb_interfac
        }
 
        dev->udev = udev;
+       dev->intf = iface;
        dev->input = input_dev;
        dev->overflowwarn = 0;
        if (atp_is_geyser_3(dev))
@@ -714,7 +733,7 @@ static int atp_resume(struct usb_interfa
 {
        struct atp *dev = usb_get_intfdata(iface);
 
-       if (dev->open && usb_submit_urb(dev->urb, GFP_ATOMIC))
+       if (dev->open && usb_submit_urb(dev->urb, GFP_NOIO))
                return -EIO;
 
        return 0;
@@ -727,6 +746,7 @@ static struct usb_driver atp_driver = {
        .suspend        = atp_suspend,
        .resume         = atp_resume,
        .id_table       = atp_table,
+       .supports_autosuspend = 1,
 };
 
 static int __init atp_init(void)