linux-kernel - [RFCv3 1/7] HID: Add map_msc() to avoid boilerplate code

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Date:   Wed,  1 Dec 2021 18:42:55 +0200
From:   Tero Kristo <tero.kristo@...ux.intel.com>
To:     linux-input@...r.kernel.org, benjamin.tissoires@...hat.com,
        jikos@...nel.org, mika.westerberg@...ux.intel.com,
        tero.kristo@...ux.intel.com
Cc:     linux-kernel@...r.kernel.org, dmitry.torokhov@...il.com,
        peter.hutterer@...-t.net
Subject: [RFCv3 1/7] HID: Add map_msc() to avoid boilerplate code

From: Mika Westerberg <mika.westerberg@...ux.intel.com>

Since we are going to have more MSC events too, add map_msc() that can
be used to fill in necessary fields and avoid boilerplate code.

Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
 drivers/hid/hid-input.c | 6 ++----
 include/linux/hid.h     | 4 ++++
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 2c72ce4147b1..39ebedb2323b 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -52,6 +52,7 @@ static const struct {
 #define map_rel(c)	hid_map_usage(hidinput, usage, &bit, &max, EV_REL, (c))
 #define map_key(c)	hid_map_usage(hidinput, usage, &bit, &max, EV_KEY, (c))
 #define map_led(c)	hid_map_usage(hidinput, usage, &bit, &max, EV_LED, (c))
+#define map_msc(c)	hid_map_usage(hidinput, usage, &bit, &max, EV_MSC, (c))
 
 #define map_abs_clear(c)	hid_map_usage_clear(hidinput, usage, &bit, \
 		&max, EV_ABS, (c))
@@ -872,10 +873,7 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
 
 		case 0x5b: /* TransducerSerialNumber */
 		case 0x6e: /* TransducerSerialNumber2 */
-			usage->type = EV_MSC;
-			usage->code = MSC_SERIAL;
-			bit = input->mscbit;
-			max = MSC_MAX;
+			map_msc(MSC_SERIAL);
 			break;
 
 		default:  goto unknown;
diff --git a/include/linux/hid.h b/include/linux/hid.h
index e95800bab56a..96eaca0d5322 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -766,6 +766,10 @@ static inline void hid_map_usage(struct hid_input *hidinput,
 		bmap = input->ledbit;
 		limit = LED_MAX;
 		break;
+	case EV_MSC:
+		bmap = input->mscbit;
+		limit = MSC_MAX;
+		break;
 	}
 
 	if (unlikely(c > limit || !bmap)) {
-- 
2.25.1