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HID: lenovo: Add middleclick_workaround sysfs knob for cptkbd

Message ID 20231223191401.70727-1-me@khvoinitsky.org
State Accepted
Commit 2814646f76f8518326964f12ff20aaee70ba154d
Headers show
Series HID: lenovo: Add middleclick_workaround sysfs knob for cptkbd | expand

Commit Message

Mikhail Khvoinitsky Dec. 23, 2023, 7:12 p.m. UTC
Previous attempt to autodetect well-behaving patched firmware
introduced in commit 46a0a2c96f0f ("HID: lenovo: Detect quirk-free fw
on cptkbd and stop applying workaround") has shown that there are
false-positives on original firmware (on both 1st gen and 2nd gen
keyboards) which causes the middle button click workaround to be
mistakenly disabled.

This commit adds explicit parameter to sysfs to control this
workaround.

Fixes: 46a0a2c96f0f ("HID: lenovo: Detect quirk-free fw on cptkbd and stop applying workaround")
Fixes: 43527a0094c1 ("HID: lenovo: Restrict detection of patched firmware only to USB cptkbd")
Signed-off-by: Mikhail Khvainitski <me@khvoinitsky.org>
---
 drivers/hid/hid-lenovo.c | 57 +++++++++++++++++++++++++++-------------
 1 file changed, 39 insertions(+), 18 deletions(-)

Comments

Jiri Kosina Jan. 23, 2024, 10:55 a.m. UTC | #1
On Sat, 23 Dec 2023, Mikhail Khvainitski wrote:

> Previous attempt to autodetect well-behaving patched firmware
> introduced in commit 46a0a2c96f0f ("HID: lenovo: Detect quirk-free fw
> on cptkbd and stop applying workaround") has shown that there are
> false-positives on original firmware (on both 1st gen and 2nd gen
> keyboards) which causes the middle button click workaround to be
> mistakenly disabled.
> 
> This commit adds explicit parameter to sysfs to control this
> workaround.
> 
> Fixes: 46a0a2c96f0f ("HID: lenovo: Detect quirk-free fw on cptkbd and stop applying workaround")
> Fixes: 43527a0094c1 ("HID: lenovo: Restrict detection of patched firmware only to USB cptkbd")
> Signed-off-by: Mikhail Khvainitski <me@khvoinitsky.org>

I am not a huge fan of sysctl device-specific knobs like this, but I guess 
this is the best we can get here, unfortunately.

Now applied, thanks a lot.
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Patch

diff --git a/drivers/hid/hid-lenovo.c b/drivers/hid/hid-lenovo.c
index 149a3c74346b..f86c1ea83a03 100644
--- a/drivers/hid/hid-lenovo.c
+++ b/drivers/hid/hid-lenovo.c
@@ -54,10 +54,10 @@  struct lenovo_drvdata {
 	/* 0: Up
 	 * 1: Down (undecided)
 	 * 2: Scrolling
-	 * 3: Patched firmware, disable workaround
 	 */
 	u8 middlebutton_state;
 	bool fn_lock;
+	bool middleclick_workaround_cptkbd;
 };
 
 #define map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, EV_KEY, (c))
@@ -621,6 +621,36 @@  static ssize_t attr_sensitivity_store_cptkbd(struct device *dev,
 	return count;
 }
 
+static ssize_t attr_middleclick_workaround_show_cptkbd(struct device *dev,
+		struct device_attribute *attr,
+		char *buf)
+{
+	struct hid_device *hdev = to_hid_device(dev);
+	struct lenovo_drvdata *cptkbd_data = hid_get_drvdata(hdev);
+
+	return snprintf(buf, PAGE_SIZE, "%u\n",
+		cptkbd_data->middleclick_workaround_cptkbd);
+}
+
+static ssize_t attr_middleclick_workaround_store_cptkbd(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf,
+		size_t count)
+{
+	struct hid_device *hdev = to_hid_device(dev);
+	struct lenovo_drvdata *cptkbd_data = hid_get_drvdata(hdev);
+	int value;
+
+	if (kstrtoint(buf, 10, &value))
+		return -EINVAL;
+	if (value < 0 || value > 1)
+		return -EINVAL;
+
+	cptkbd_data->middleclick_workaround_cptkbd = !!value;
+
+	return count;
+}
+
 
 static struct device_attribute dev_attr_fn_lock =
 	__ATTR(fn_lock, S_IWUSR | S_IRUGO,
@@ -632,10 +662,16 @@  static struct device_attribute dev_attr_sensitivity_cptkbd =
 			attr_sensitivity_show_cptkbd,
 			attr_sensitivity_store_cptkbd);
 
+static struct device_attribute dev_attr_middleclick_workaround_cptkbd =
+	__ATTR(middleclick_workaround, S_IWUSR | S_IRUGO,
+			attr_middleclick_workaround_show_cptkbd,
+			attr_middleclick_workaround_store_cptkbd);
+
 
 static struct attribute *lenovo_attributes_cptkbd[] = {
 	&dev_attr_fn_lock.attr,
 	&dev_attr_sensitivity_cptkbd.attr,
+	&dev_attr_middleclick_workaround_cptkbd.attr,
 	NULL
 };
 
@@ -686,23 +722,7 @@  static int lenovo_event_cptkbd(struct hid_device *hdev,
 {
 	struct lenovo_drvdata *cptkbd_data = hid_get_drvdata(hdev);
 
-	if (cptkbd_data->middlebutton_state != 3) {
-		/* REL_X and REL_Y events during middle button pressed
-		 * are only possible on patched, bug-free firmware
-		 * so set middlebutton_state to 3
-		 * to never apply workaround anymore
-		 */
-		if (hdev->product == USB_DEVICE_ID_LENOVO_CUSBKBD &&
-				cptkbd_data->middlebutton_state == 1 &&
-				usage->type == EV_REL &&
-				(usage->code == REL_X || usage->code == REL_Y)) {
-			cptkbd_data->middlebutton_state = 3;
-			/* send middle button press which was hold before */
-			input_event(field->hidinput->input,
-				EV_KEY, BTN_MIDDLE, 1);
-			input_sync(field->hidinput->input);
-		}
-
+	if (cptkbd_data->middleclick_workaround_cptkbd) {
 		/* "wheel" scroll events */
 		if (usage->type == EV_REL && (usage->code == REL_WHEEL ||
 				usage->code == REL_HWHEEL)) {
@@ -1166,6 +1186,7 @@  static int lenovo_probe_cptkbd(struct hid_device *hdev)
 	cptkbd_data->middlebutton_state = 0;
 	cptkbd_data->fn_lock = true;
 	cptkbd_data->sensitivity = 0x05;
+	cptkbd_data->middleclick_workaround_cptkbd = true;
 	lenovo_features_set_cptkbd(hdev);
 
 	ret = sysfs_create_group(&hdev->dev.kobj, &lenovo_attr_group_cptkbd);