HID: usbhid: add always-poll quirk

Add quirk to make sure that a device is always polled for input events
even if it hasn't been opened.

This is needed for devices that disconnects from the bus unless the
interrupt endpoint has been polled at least once or when not responding
to an input event (e.g. after having shut down X).

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 79cf503..ddd547a 100644 (file)
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -82,7 +82,7 @@ static int hid_start_in(struct hid_device *hid)
        struct usbhid_device *usbhid = hid->driver_data;
 
        spin_lock_irqsave(&usbhid->lock, flags);
-       if (hid->open > 0 &&
+       if ((hid->open > 0 || hid->quirks & HID_QUIRK_ALWAYS_POLL) &&
                        !test_bit(HID_DISCONNECTED, &usbhid->iofl) &&
                        !test_bit(HID_SUSPENDED, &usbhid->iofl) &&
                        !test_and_set_bit(HID_IN_RUNNING, &usbhid->iofl)) {
@@ -292,6 +292,8 @@ static void hid_irq_in(struct urb *urb)
        case 0:                 /* success */
                usbhid_mark_busy(usbhid);
                usbhid->retry_delay = 0;
+               if ((hid->quirks & HID_QUIRK_ALWAYS_POLL) && !hid->open)
+                       break;
                hid_input_report(urb->context, HID_INPUT_REPORT,
                                 urb->transfer_buffer,
                                 urb->actual_length, 1);
@@ -735,8 +737,10 @@ void usbhid_close(struct hid_device *hid)
        if (!--hid->open) {
                spin_unlock_irq(&usbhid->lock);
                hid_cancel_delayed_stuff(usbhid);
-               usb_kill_urb(usbhid->urbin);
-               usbhid->intf->needs_remote_wakeup = 0;
+               if (!(hid->quirks & HID_QUIRK_ALWAYS_POLL)) {
+                       usb_kill_urb(usbhid->urbin);
+                       usbhid->intf->needs_remote_wakeup = 0;
+               }
        } else {
                spin_unlock_irq(&usbhid->lock);
        }
@@ -1134,6 +1138,19 @@ static int usbhid_start(struct hid_device *hid)
 
        set_bit(HID_STARTED, &usbhid->iofl);
 
+       if (hid->quirks & HID_QUIRK_ALWAYS_POLL) {
+               ret = usb_autopm_get_interface(usbhid->intf);
+               if (ret)
+                       goto fail;
+               usbhid->intf->needs_remote_wakeup = 1;
+               ret = hid_start_in(hid);
+               if (ret) {
+                       dev_err(&hid->dev,
+                               "failed to start in urb: %d\n", ret);
+               }
+               usb_autopm_put_interface(usbhid->intf);
+       }
+
        /* Some keyboards don't work until their LEDs have been set.
         * Since BIOSes do set the LEDs, it must be safe for any device
         * that supports the keyboard boot protocol.
@@ -1166,6 +1183,9 @@ static void usbhid_stop(struct hid_device *hid)
        if (WARN_ON(!usbhid))
                return;
 
+       if (hid->quirks & HID_QUIRK_ALWAYS_POLL)
+               usbhid->intf->needs_remote_wakeup = 0;
+
        clear_bit(HID_STARTED, &usbhid->iofl);
        spin_lock_irq(&usbhid->lock);   /* Sync with error and led handlers */
        set_bit(HID_DISCONNECTED, &usbhid->iofl);

diff --git a/include/linux/hid.h b/include/linux/hid.h
index f53c4a9..26ee25f 100644 (file)
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -287,6 +287,7 @@ struct hid_item {
 #define HID_QUIRK_HIDINPUT_FORCE               0x00000080
 #define HID_QUIRK_NO_EMPTY_INPUT               0x00000100
 #define HID_QUIRK_NO_INIT_INPUT_REPORTS                0x00000200
+#define HID_QUIRK_ALWAYS_POLL                  0x00000400
 #define HID_QUIRK_SKIP_OUTPUT_REPORTS          0x00010000
 #define HID_QUIRK_SKIP_OUTPUT_REPORT_ID                0x00020000
 #define HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP 0x00040000