linux-kernel - [PATCH 1/3] HID: logitech-hidpp: Add more debug statements

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Message-Id: <20230206135808.8840-1-hadess@hadess.net>
Date:   Mon,  6 Feb 2023 14:58:06 +0100
From:   Bastien Nocera <hadess@...ess.net>
To:     linux-input@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        "Peter F . Patel-Schneider" <pfpschneider@...il.com>,
        Filipe Laíns <lains@...eup.net>,
        Nestor Lopez Casado <nlopezcasad@...itech.com>
Subject: [PATCH 1/3] HID: logitech-hidpp: Add more debug statements

This should help us figure out some hairy problems with some devices.

Signed-off-by: Bastien Nocera <hadess@...ess.net>
---
 drivers/hid/hid-logitech-hidpp.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index f44ba7be3cc5..6386d3f023ca 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -338,8 +338,12 @@ static int hidpp_send_fap_command_sync(struct hidpp_device *hidpp,
 	struct hidpp_report *message;
 	int ret;
 
-	if (param_count > sizeof(message->fap.params))
+	if (param_count > sizeof(message->fap.params)) {
+		hid_dbg(hidpp->hid_dev,
+			"Invalid number of parameters passed to command (%d != %ld)\n",
+			param_count, sizeof(message->fap.params));
 		return -EINVAL;
+	}
 
 	message = kzalloc(sizeof(struct hidpp_report), GFP_KERNEL);
 	if (!message)
@@ -3440,11 +3444,17 @@ static int hi_res_scroll_enable(struct hidpp_device *hidpp)
 		ret = hidpp10_enable_scrolling_acceleration(hidpp);
 		multiplier = 8;
 	}
-	if (ret)
+	if (ret) {
+		hid_dbg(hidpp->hid_dev,
+			"Could not enable hi-res scrolling: %d\n", ret);
 		return ret;
+	}
 
-	if (multiplier == 0)
+	if (multiplier == 0) {
+		hid_dbg(hidpp->hid_dev,
+			"Invalid multiplier 0 from device, setting it to 1\n");
 		multiplier = 1;
+	}
 
 	hidpp->vertical_wheel_counter.wheel_multiplier = multiplier;
 	hid_dbg(hidpp->hid_dev, "wheel multiplier = %d\n", multiplier);
-- 
2.39.1