[PATCH v2] platform/x86: ideapad-laptop: Add Yoga Pro 7 14IAH10 Mode key

[Navon John Lukose <navonjohnlukose@gmail.com>]

The F9 "Mode" key emits WMI fn-key event 0x46, which the keymap does not
cover, so it reaches userspace as KEY_UNKNOWN and cannot be remapped from
there. Under Windows it opens a performance profile chooser. The Fn+Q
button already cycles platform_profile through
ideapad_check_special_buttons(), so map 0x46 to KEY_PROG4 as a
user-assignable key rather than cycling the profile a second way.

Signed-off-by: Navon John Lukose <navonjohnlukose@gmail.com>
---
v2: reword the entry comment and explain why 0x46 is not routed through
platform_profile_cycle() (Hans).

https://lore.kernel.org/platform-driver-x86/2eab84cb-6d2f-4ec3-9869-e2aa9c1d75da@kernel.org/

Lenovo Yoga Pro 7 14IAH10 (83KF), BIOS QGCN35WW.

Measured with dyndbg on ideapad-laptop.c and a kprobe on
platform_profile_cycle():

  Mode key (plain F9), 2 presses:
      WMI fn-key event: 0x46, twice
      no platform_profile change

  Fn+Q, 2 presses:
      platform_profile_cycle() twice, called from ideapad_acpi_notify()
      no WMI fn-key event

 drivers/platform/x86/lenovo/ideapad-laptop.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/platform/x86/lenovo/ideapad-laptop.c b/drivers/platform/x86/lenovo/ideapad-laptop.c
index 8213524..35c13d9 100644
--- a/drivers/platform/x86/lenovo/ideapad-laptop.c
+++ b/drivers/platform/x86/lenovo/ideapad-laptop.c
@@ -1360,6 +1360,8 @@ static const struct key_entry ideapad_keymap[] = {
 	{ KE_KEY,	0x45 | IDEAPAD_WMI_KEY, { KEY_PROG3 } },
 	/* Performance toggle also Fn+Q, handled inside ideapad_wmi_notify() */
 	{ KE_KEY,	0x3d | IDEAPAD_WMI_KEY, { KEY_PROG4 } },
+	/* Mode, opens a profile chooser; the Fn+Q button cycles the profile */
+	{ KE_KEY,	0x46 | IDEAPAD_WMI_KEY, { KEY_PROG4 } },
 	/* shift + prtsc */
 	{ KE_KEY,   0x2d | IDEAPAD_WMI_KEY, { KEY_SELECTIVE_SCREENSHOT } },
 	{ KE_KEY,   0x29 | IDEAPAD_WMI_KEY, { KEY_TOUCHPAD_TOGGLE } },
-- 
2.55.0