3.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold <johan@xxxxxxxxxx>
commit 0b750b3baa2d64f1b77aecc10f20deeb28efe60d upstream.
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@xxxxxxxxxx>
Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hid/usbhid/hid-core.c | 26 +++++++++++++++++++++++---
include/linux/hid.h | 1 +
2 files changed, 24 insertions(+), 3 deletions(-)
--- 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_devic
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);
@@ -734,8 +736,10 @@ 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);
}
@@ -1119,6 +1123,19 @@ static int usbhid_start(struct hid_devic
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.
@@ -1151,6 +1168,9 @@ static void usbhid_stop(struct hid_devic
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);
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -286,6 +286,7 @@ 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_FULLSPEED_INTERVAL 0x10000000
#define HID_QUIRK_NO_INIT_REPORTS 0x20000000
--
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