Hi,
this patch makes hid devices do simple open/close powersave.
This is helpful only in a minority of cases, but it works. Powersave
with timeouts will need this as a foundation.
Alan, I've made use of your suggestion and put the macros into
usb.h so they can be commonly used.
Regards
Oliver
Signed-off-by: Oliver Neukum <[EMAIL PROTECTED]>
diff --git a/drivers/usb/input/hid-core.c b/drivers/usb/input/hid-core.c
index 0549ec9..7f840d2 100644
--- a/drivers/usb/input/hid-core.c
+++ b/drivers/usb/input/hid-core.c
@@ -1402,7 +1402,10 @@ static int hid_get_class_descriptor(stru
int hid_open(struct hid_device *hid)
{
- ++hid->open;
+ if (!hid->open++) {
+ usb_autopm_disable(hid->intf);
+ }
+
if (hid_start_in(hid))
hid_io_error(hid);
return 0;
@@ -1410,8 +1413,10 @@ int hid_open(struct hid_device *hid)
void hid_close(struct hid_device *hid)
{
- if (!--hid->open)
+ if (!--hid->open) {
usb_kill_urb(hid->urbin);
+ usb_autopm_enable(hid->intf);
+ }
}
#define USB_VENDOR_ID_PANJIT 0x134c
@@ -2221,6 +2226,7 @@ static struct usb_driver hid_driver = {
.pre_reset = hid_pre_reset,
.post_reset = hid_post_reset,
.id_table = hid_usb_ids,
+ .supports_autosuspend = 1,
};
static int __init hid_init(void)
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 6b902a3..9871651 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -744,6 +744,18 @@ extern void usb_deregister_dev(struct us
extern int usb_disabled(void);
+/*
+ * autopm helpers
+ */
+
+#define usb_autopm_enable(intf) do { \
+ (intf)->pm_usage_cnt = 0; \
+ usb_autopm_set_interface(intf); } while (0)
+
+#define usb_autopm_disable(intf) do { \
+ (intf)->pm_usage_cnt = 1; \
+ usb_autopm_set_interface(intf); } while (0)
+
/* ----------------------------------------------------------------------- */
/*
-------------------------------------------------------------------------
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