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>

6 files changed, 15 insertions, 17 deletions

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 3402033fa52a..ee6ba7625e77 100644
--- a/drivers/hid/hid-core.c
+++ b/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()
  */
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 725f22ca47fc..1e95f4df4146 100644
--- a/drivers/hid/hid-input.c
+++ b/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;
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 683cda6c60ce..f65e78b46999 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/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");
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index ca6849a0121e..b6cb7a5e4b27 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/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,
diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index 8593047bb726..8e02a4a6fde0 100644
--- a/drivers/hid/wacom_sys.c
+++ b/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;
         }
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 78ea9bf941cd..2366fda010c8 100644
--- a/include/linux/hid.h
+++ b/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);