[PATCH 2/3] platform/x86: asus-armoury: Add dgpu_power_state attribute

[Marco Scardovi <scardracs@disroot.org>]

Add support for WMI device ID 0x00120097 (ASUS_WMI_DEVID_DGPU_POWER_STATE)
in the asus-armoury driver. This exposes a read-only sysfs attribute
'dgpu_power_state' under the firmware_attributes class to query the
discrete GPU power state (0: D3 cold, 1: D0 active).

Suggested-by: Denis Benato <denis.benato@linux.dev>
Signed-off-by: Marco Scardovi <scardracs@disroot.org>
---
 drivers/platform/x86/asus-armoury.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/platform/x86/asus-armoury.c b/drivers/platform/x86/asus-armoury.c
index 93d9665717af..f745924af8a8 100644
--- a/drivers/platform/x86/asus-armoury.c
+++ b/drivers/platform/x86/asus-armoury.c
@@ -786,6 +786,8 @@ ASUS_ATTR_GROUP_BOOL_RW(screen_auto_brightness, "screen_auto_brightness",
 			"Set the panel brightness to Off<0> or On<1>");
 ASUS_ATTR_GROUP_BOOL_RO(egpu_connected, "egpu_connected", ASUS_WMI_DEVID_EGPU_CONNECTED,
 			"Show the eGPU connection status");
+ASUS_ATTR_GROUP_BOOL_RO(dgpu_power_state, "dgpu_power_state", ASUS_WMI_DEVID_DGPU_POWER_STATE,
+			"Show the dGPU power state (0: D3 cold, 1: D0 active)");
 ASUS_ATTR_GROUP_ROG_TUNABLE(ppt_pl1_spl, ATTR_PPT_PL1_SPL, ASUS_WMI_DEVID_PPT_PL1_SPL,
 			    "Set the CPU slow package limit");
 ASUS_ATTR_GROUP_ROG_TUNABLE(ppt_pl2_sppt, ATTR_PPT_PL2_SPPT, ASUS_WMI_DEVID_PPT_PL2_SPPT,
@@ -810,6 +812,7 @@ static const struct asus_attr_group armoury_attr_groups[] = {
 	{ &egpu_connected_attr_group, ASUS_WMI_DEVID_EGPU_CONNECTED },
 	{ &egpu_enable_attr_group, ASUS_WMI_DEVID_EGPU },
 	{ &dgpu_disable_attr_group, ASUS_WMI_DEVID_DGPU },
+	{ &dgpu_power_state_attr_group, ASUS_WMI_DEVID_DGPU_POWER_STATE },
 	{ &apu_mem_attr_group, ASUS_WMI_DEVID_APU_MEM },
 
 	{ &ppt_pl1_spl_attr_group, ASUS_WMI_DEVID_PPT_PL1_SPL },
-- 
2.55.0