linux-kernel - [PATCH v2 6/7] HID: ft260: do not populate /dev/hidraw device

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Date:   Wed, 28 Sep 2022 17:48:53 +0300
From:   Michael Zaidman <michael.zaidman@...il.com>
To:     jikos@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        Michael Zaidman <michael.zaidman@...il.com>,
        Enrik Berkhan <Enrik.Berkhan@...a.de>
Subject: [PATCH v2 6/7] HID: ft260: do not populate /dev/hidraw device

Do not populate the /dev/hidraw on ft260 interfaces when the hid-ft260
driver is loaded.

$ sudo insmod hid-ft260.ko
$ ls /dev/hidraw*
/dev/hidraw0

$ sudo rmmod hid-ft260.ko
$ ls /dev/hidraw*
/dev/hidraw0  /dev/hidraw1  /dev/hidraw2

Reported-by: Enrik Berkhan <Enrik.Berkhan@...a.de>
Signed-off-by: Michael Zaidman <michael.zaidman@...il.com>
---
 drivers/hid/hid-ft260.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/hid/hid-ft260.c b/drivers/hid/hid-ft260.c
index c7c3a9d395a2..bb9f4e07c21d 100644
--- a/drivers/hid/hid-ft260.c
+++ b/drivers/hid/hid-ft260.c
@@ -938,7 +938,7 @@ static int ft260_probe(struct hid_device *hdev, const struct hid_device_id *id)
 		return ret;
 	}
 
-	ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
+	ret = hid_hw_start(hdev, 0);
 	if (ret) {
 		hid_err(hdev, "failed to start HID HW\n");
 		return ret;
@@ -965,6 +965,10 @@ static int ft260_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	if (ret <= 0)
 		goto err_hid_close;
 
+	hid_info(hdev, "USB HID v%x.%02x Device [%s] on %s\n",
+		hdev->version >> 8, hdev->version & 0xff, hdev->name,
+		hdev->phys);
+
 	hid_set_drvdata(hdev, dev);
 	dev->hdev = hdev;
 	dev->adap.owner = THIS_MODULE;
@@ -973,8 +977,7 @@ static int ft260_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	dev->adap.quirks = &ft260_i2c_quirks;
 	dev->adap.dev.parent = &hdev->dev;
 	snprintf(dev->adap.name, sizeof(dev->adap.name),
-		 "FT260 usb-i2c bridge on hidraw%d",
-		 ((struct hidraw *)hdev->hidraw)->minor);
+		 "FT260 usb-i2c bridge");
 
 	mutex_init(&dev->lock);
 	init_completion(&dev->wait);
-- 
2.34.1