[PATCH v2] Input: atkbd - Skip ATKBD_CMD_GETID in translated mode

[Hans de Goede <hdegoede@redhat.com>]

There have been multiple reports of keyboard issues on recent laptop models
which can be worked around by setting i8042.dumbkbd, with the downside
being this breaks the capslock LED.

It seems that these issues are caused by recent laptops getting confused by
ATKBD_CMD_GETID. Rather then adding and endless growing list of quirks for
this, just skip ATKBD_CMD_GETID alltogether on laptops in translated mode.

The main goal of sending ATKBD_CMD_GETID is to skip binding to ps/2
mice/touchpads and those are never used in translated mode.

Examples of laptop models which benefit from skipping ATKBD_CMD_GETID:

* "HP Laptop 15s-fq2xxx", "HP laptop 15s-fq4xxx" and "HP Laptop 15-dy2xxx"
  models the kbd stops working for the first 2 - 5 minutes after boot
  (waiting for EC watchdog reset?)

* On "HP Spectre x360 13-aw2xxx" atkbd fails to probe the keyboard

* At least 9 different Lenovo models have issues with ATKBD_CMD_GETID, see:
  https://github.com/yescallop/atkbd-nogetid

This has been tested on:

1. A MSI B550M PRO-VDH WIFI desktop, where the i8042 controller is not
   in translated mode when no keyboard is plugged in and with a ps/2 kbd
   a "AT Translated Set 2 keyboard" /dev/input/event# node shows up

2. A Lenovo ThinkPad X1 Yoga gen 8 (always has a translated set 2 keyboard)

Reported-by: Shang Ye <yesh25@mail2.sysu.edu.cn>
Closes: https://lore.kernel.org/linux-input/886D6167733841AE+20231017135318.11142-1-yesh25@mail2.sysu.edu.cn/
Closes: https://github.com/yescallop/atkbd-nogetid
Reported-by: gurevitch <mail@gurevit.ch>
Closes: https://lore.kernel.org/linux-input/2iAJTwqZV6lQs26cTb38RNYqxvsink6SRmrZ5h0cBUSuf9NT0tZTsf9fEAbbto2maavHJEOP8GA1evlKa6xjKOsaskDhtJWxjcnrgPigzVo=@gurevit.ch/
Reported-by: Egor Ignatov <egori@altlinux.org>
Closes: https://lore.kernel.org/all/20210609073333.8425-1-egori@altlinux.org/
Reported-by: Anton Zhilyaev <anton@cpp.in>
Closes: https://lore.kernel.org/linux-input/20210201160336.16008-1-anton@cpp.in/
Closes: https://bugzilla.redhat.com/show_bug.cgi?id=2086156
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Note this supersedes my previous atkbd series:
https://lore.kernel.org/linux-input/20231005201544.26983-1-hdegoede@redhat.com/
---
Changes in v2:
- Add DMI check for laptop chassis types and only skip ATKBD_CMD_GETID
  on laptops with the i8042 in translated mode
---
 drivers/input/keyboard/atkbd.c | 61 +++++++++++++++++++++++++++++++---
 1 file changed, 57 insertions(+), 4 deletions(-)

diff --git a/drivers/input/keyboard/atkbd.c b/drivers/input/keyboard/atkbd.c
index c92e544c792d..5667f1e80839 100644
--- a/drivers/input/keyboard/atkbd.c
+++ b/drivers/input/keyboard/atkbd.c
@@ -765,6 +765,59 @@ static void atkbd_deactivate(struct atkbd *atkbd)
 			ps2dev->serio->phys);
 }
 
+#ifdef CONFIG_X86
+static const struct dmi_system_id atkbd_dmi_laptop_table[] = {
+	{
+		.matches = {
+			DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "8"), /* Portable */
+		},
+	},
+	{
+		.matches = {
+			DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "9"), /* Laptop */
+		},
+	},
+	{
+		.matches = {
+			DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "10"), /* Notebook */
+		},
+	},
+	{
+		.matches = {
+			DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "14"), /* Sub-Notebook */
+		},
+	},
+	{
+		.matches = {
+			DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "31"), /* Convertible */
+		},
+	},
+	{
+		.matches = {
+			DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "32"), /* Detachable */
+		},
+	},
+	{ }
+};
+
+/*
+ * On many modern laptops ATKBD_CMD_GETID may cause problems, on these laptops
+ * the controller is always in translated mode. In this mode mice/touchpads will
+ * not work. So in this case simply assume a keyboard is connected to avoid
+ * confusing some laptop keyboards.
+ *
+ * Skipping ATKBD_CMD_GETID ends up using a fake keyboard id. Using a fake id is
+ * ok in translated mode, only atkbd_select_set() checks atkbd->id and in
+ * translated mode that is a no-op.
+ */
+static bool atkbd_skip_getid(struct atkbd *atkbd)
+{
+	return atkbd->translated && dmi_check_system(atkbd_dmi_laptop_table);
+}
+#else
+static inline bool atkbd_skip_getid(struct atkbd *atkbd) { return false; }
+#endif
+
 /*
  * atkbd_probe() probes for an AT keyboard on a serio port.
  */
@@ -794,12 +847,12 @@ static int atkbd_probe(struct atkbd *atkbd)
  */
 
 	param[0] = param[1] = 0xa5;	/* initialize with invalid values */
-	if (ps2_command(ps2dev, param, ATKBD_CMD_GETID)) {
+	if (atkbd_skip_getid(atkbd) || ps2_command(ps2dev, param, ATKBD_CMD_GETID)) {
 
 /*
- * If the get ID command failed, we check if we can at least set the LEDs on
- * the keyboard. This should work on every keyboard out there. It also turns
- * the LEDs off, which we want anyway.
+ * If the get ID command was skipped or failed, we check if we can at least set
+ * the LEDs on the keyboard. This should work on every keyboard out there.
+ * It also turns the LEDs off, which we want anyway.
  */
 		param[0] = 0;
 		if (ps2_command(ps2dev, param, ATKBD_CMD_SETLEDS))
-- 
2.41.0