HID: usbhid: defer LED setting to a workqueue

Defer LED setting action to a workqueue.
This is more likely to send all LED change events in a single URB.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Acked-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index b9b8c75a6f9a..c6ee632bfd68 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -976,6 +976,48 @@ int hidinput_find_field(struct hid_device *hid, unsigned int type, unsigned int
 }
 EXPORT_SYMBOL_GPL(hidinput_find_field);
 
+struct hid_field *hidinput_get_led_field(struct hid_device *hid)
+{
+        struct hid_report *report;
+        struct hid_field *field;
+        int i, j;
+
+        list_for_each_entry(report,
+                            &hid->report_enum[HID_OUTPUT_REPORT].report_list,
+                            list) {
+                for (i = 0; i < report->maxfield; i++) {
+                        field = report->field[i];
+                        for (j = 0; j < field->maxusage; j++)
+                                if (field->usage[j].type == EV_LED)
+                                        return field;
+                }
+        }
+        return NULL;
+}
+EXPORT_SYMBOL_GPL(hidinput_get_led_field);
+
+unsigned int hidinput_count_leds(struct hid_device *hid)
+{
+        struct hid_report *report;
+        struct hid_field *field;
+        int i, j;
+        unsigned int count = 0;
+
+        list_for_each_entry(report,
+                            &hid->report_enum[HID_OUTPUT_REPORT].report_list,
+                            list) {
+                for (i = 0; i < report->maxfield; i++) {
+                        field = report->field[i];
+                        for (j = 0; j < field->maxusage; j++)
+                                if (field->usage[j].type == EV_LED &&
+                                    field->value[j])
+                                        count += 1;
+                }
+        }
+        return count;
+}
+EXPORT_SYMBOL_GPL(hidinput_count_leds);
+
 static int hidinput_open(struct input_dev *dev)
 {
         struct hid_device *hid = input_get_drvdata(dev);