HID: make hid_report_len as a static inline function in hid.h

In several hid drivers it is necessary to calculate the length of an
hid_report. This patch exports the existing static function hid_report_len of
hid-core.c as an inline function in hid.h

Signed-off-by: Mathieu Magnaudet <mathieu.magnaudet@enac.fr>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-core.c

@@ -1280,12 +1280,6 @@ void hid_output_report(struct hid_report *report, __u8 *data)
 }
 EXPORT_SYMBOL_GPL(hid_output_report);
 
-static int hid_report_len(struct hid_report *report)
-{
-	/* equivalent to DIV_ROUND_UP(report->size, 8) + !!(report->id > 0) */
-	return ((report->size - 1) >> 3) + 1 + (report->id > 0);
-}
-
 /*
  * Allocator for buffer that is going to be passed to hid_output_report()
  */

drivers/hid/hid-input.c

@@ -1215,7 +1215,7 @@ static void hidinput_led_worker(struct work_struct *work)
 		return hid->ll_driver->request(hid, report, HID_REQ_SET_REPORT);
 
 	/* fall back to generic raw-output-report */
-	len = ((report->size - 1) >> 3) + 1 + (report->id > 0);
+	len = hid_report_len(report);
 	buf = hid_alloc_report_buf(report, GFP_KERNEL);
 	if (!buf)
 		return;

drivers/hid/hid-multitouch.c

@@ -827,7 +827,7 @@ static void mt_set_input_mode(struct hid_device *hdev)
 	r = re->report_id_hash[td->inputmode];
 	if (r) {
 		if (cls->quirks & MT_QUIRK_FORCE_GET_FEATURE) {
-			report_len = ((r->size - 1) >> 3) + 1 + (r->id > 0);
+			report_len = hid_report_len(r);
 			buf = hid_alloc_report_buf(r, GFP_KERNEL);
 			if (!buf) {
 				hid_err(hdev, "failed to allocate buffer for report\n");

drivers/hid/usbhid/hid-core.c

@@ -338,8 +338,7 @@ static int hid_submit_out(struct hid_device *hid)
 	report = usbhid->out[usbhid->outtail].report;
 	raw_report = usbhid->out[usbhid->outtail].raw_report;
 
-	usbhid->urbout->transfer_buffer_length = ((report->size - 1) >> 3) +
-						 1 + (report->id > 0);
+	usbhid->urbout->transfer_buffer_length = hid_report_len(report);
 	usbhid->urbout->dev = hid_to_usb_dev(hid);
 	if (raw_report) {
 		memcpy(usbhid->outbuf, raw_report,

drivers/hid/wacom_sys.c

@@ -1321,12 +1321,6 @@ static void wacom_calculate_res(struct wacom_features *features)
 						    features->unitExpo);
 }
 
-static int wacom_hid_report_len(struct hid_report *report)
-{
-	/* equivalent to DIV_ROUND_UP(report->size, 8) + !!(report->id > 0) */
-	return ((report->size - 1) >> 3) + 1 + (report->id > 0);
-}
-
 static size_t wacom_compute_pktlen(struct hid_device *hdev)
 {
 	struct hid_report_enum *report_enum;
@@ -1336,7 +1330,7 @@ static size_t wacom_compute_pktlen(struct hid_device *hdev)
 	report_enum = hdev->report_enum + HID_INPUT_REPORT;
 
 	list_for_each_entry(report, &report_enum->report_list, list) {
-		size_t report_size = wacom_hid_report_len(report);
+		size_t report_size = hid_report_len(report);
 		if (report_size > size)
 			size = report_size;
 	}

include/linux/hid.h

@@ -1063,6 +1063,17 @@ static inline void hid_hw_wait(struct hid_device *hdev)
 		hdev->ll_driver->wait(hdev);
 }
 
+/**
+ * hid_report_len - calculate the report length
+ *
+ * @report: the report we want to know the length
+ */
+static inline int hid_report_len(struct hid_report *report)
+{
+	/* equivalent to DIV_ROUND_UP(report->size, 8) + !!(report->id > 0) */
+	return ((report->size - 1) >> 3) + 1 + (report->id > 0);
+}
+
 int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
 		int interrupt);