linux-kernel - [PATCH 2/2] HID: input: optionally use device id in battery name

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Date:   Mon, 31 Jul 2017 16:21:04 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Jason Gerecke <killertofu@...il.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] HID: input: optionally use device id in battery name

Manufacturers do not always populate serial number in their devices, so
let's fall back to device ID when forming the battery device name. As a
result, batteries in devices without serial number will be named like
this:

	hid-0018:2D1F:510E.0001-battery

(as opposed to hid--battery for the first one, and failing to create
batteries for the subsequent ones).

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 drivers/hid/hid-input.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 5bcd4e4afb54..299694cfede9 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -453,7 +453,9 @@ static int hidinput_setup_battery(struct hid_device *dev, unsigned report_type,
 	if (!psy_desc)
 		return -ENOMEM;
 
-	psy_desc->name = kasprintf(GFP_KERNEL, "hid-%s-battery", dev->uniq);
+	psy_desc->name = kasprintf(GFP_KERNEL, "hid-%s-battery",
+				   strlen(dev->uniq) ?
+					dev->uniq : dev_name(&dev->dev));
 	if (!psy_desc->name) {
 		error = -ENOMEM;
 		goto err_free_mem;
-- 
2.14.0.rc0.400.g1c36432dff-goog