[Bug 221998] New: HID: playstation: GameSir G7 Pro 8K (054C:09CC) reports incorrect battery level (fixed at 5%)

https://bugzilla.kernel.org/show_bug.cgi?id=221998

            Bug ID: 221998
           Summary: HID: playstation: GameSir G7 Pro 8K (054C:09CC)
                    reports incorrect battery level (fixed at 5%)
           Product: Drivers
           Version: 2.5
    Kernel Version: 7.2.3-1-cachyos
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: USB
          Assignee: drivers_usb@kernel-bugs.kernel.org
          Reporter: eivaam@icloud.com
        Regression: No

The GameSir G7 Pro 8K controller, when connected via USB in DS4 mode,
is correctly detected and registered by the hid-playstation driver as a
DualShock 4 controller (USB ID 054C:09CC). The driver creates the battery
power_supply device as expected, but the reported battery capacity is
always fixed at 5% with status "Discharging", regardless of the actual
battery level.

The controller firmware is fully updated (verified via the official
GameSir iOS app, which reports 100% battery). The issue is therefore not
a firmware problem, but a parsing issue in the hid-playstation driver
when handling the battery report from this third-party controller.

Kernel version:
7.2.3-1-cachyos

Distribution:
CachyOS

Hardware:
GameSir G7 Pro 8K
- USB ID: 054C:09CC (emulated DualShock 4)
- Connection: USB cable
- Mode: DS4 (white LED)
- Firmware: latest available, updated via GameSir iOS app

Driver:
hid-playstation

Steps to reproduce:
1. Connect the GameSir G7 Pro 8K via USB in DS4 mode.
2. Wait for the device to be registered by the kernel.
3. Run:
   cat /sys/class/power_supply/ps-controller-battery-*/capacity
4. Observe that the output is always "5".
5. Run:
   cat /sys/class/power_supply/ps-controller-battery-*/status
6. Observe that the output is "Discharging" even when the controller is
   fully charged.

Expected behavior:
The reported battery capacity should reflect the actual battery level of
the controller (e.g. 100% when fully charged), and the status should
change to "Charging" or "Full" when connected to a power source.

Actual behavior:
The battery capacity is permanently fixed at 5% and the status remains
"Discharging", regardless of the real battery level or charging state.

relevant output
❯ sudo dmesg | grep -i "playstation\|hid"
[sudo] contraseña para erikalmeida: 
[15237.258389] playstation 0003:054C:09CC.0007: hidraw4: USB HID v1.11 Gamepad
[Guangzhou Chicken Run Network Technology Co., Ltd. Wireless Controller] on
usb-0000:00:14.0-9/input0
[15237.311809] playstation 0003:054C:09CC.0007: Registered DualShock4
controller hw_version=0x0000b404 fw_version=0x0000a007
[15773.043305] usbhid 1-9:1.0: can't add hid device: -71
[15773.043407] usbhid 1-9:1.0: probe with driver usbhid failed with error -71
[15773.843537] playstation 0003:054C:09CC.0008: hidraw4: USB HID v1.11 Gamepad
[Guangzhou Chicken Run Network Technology Co., Ltd. Wireless Controller] on
usb-0000:00:14.0-9/input0
[15773.895474] playstation 0003:054C:09CC.0008: Registered DualShock4
controller hw_version=0x0000b404 fw_version=0x0000a007
[19003.858872] playstation 0003:054C:09CC.0009: hidraw4: USB HID v1.11 Gamepad
[Guangzhou Chicken Run Network Technology Co., Ltd. Wireless Controller] on
usb-0000:00:14.0-9/input0
[19003.911048] playstation 0003:054C:09CC.0009: Registered DualShock4
controller hw_version=0x0000b404 fw_version=0x0000a007
[19083.872676] usbhid 1-9:1.0: can't add hid device: -71
[19083.872759] usbhid 1-9:1.0: probe with driver usbhid failed with error -71
[19084.678027] playstation 0003:054C:09CC.000A: hidraw4: USB HID v1.11 Gamepad
[Guangzhou Chicken Run Network Technology Co., Ltd. Wireless Controller] on
usb-0000:00:14.0-9/input0
[19084.731026] playstation 0003:054C:09CC.000A: Registered DualShock4
controller hw_version=0x0000b404 fw_version=0x0000a007
[21590.994275] usbhid 1-9:1.0: can't add hid device: -71
[21590.994362] usbhid 1-9:1.0: probe with driver usbhid failed with error -71
[21591.797421] playstation 0003:054C:09CC.000B: hidraw4: USB HID v1.11 Gamepad
[Guangzhou Chicken Run Network Technology Co., Ltd. Wireless Controller] on
usb-0000:00:14.0-9/input0
[21591.849420] playstation 0003:054C:09CC.000B: Registered DualShock4
controller hw_version=0x0000b404 fw_version=0x0000a007
[21679.400804] playstation 0003:054C:09CC.000C: hidraw4: USB HID v1.11 Gamepad
[Guangzhou Chicken Run Network Technology Co., Ltd. Wireless Controller] on
usb-0000:00:14.0-9/input0
[21679.454396] playstation 0003:054C:09CC.000C: Registered DualShock4
controller hw_version=0x0000b404 fw_version=0x0000a007
[21685.581701] playstation 0003:054C:09CC.000D: hidraw4: USB HID v1.11 Gamepad
[Guangzhou Chicken Run Network Technology Co., Ltd. Wireless Controller] on
usb-0000:00:14.0-9/input0
[21685.634998] playstation 0003:054C:09CC.000D: Registered DualShock4
controller hw_version=0x0000b404 fw_version=0x0000a007
❯ cat /sys/class/power_supply/ps-controller-battery-*/capacity
5
❯ cat /sys/class/power_supply/ps-controller-battery-*/status
Discharging
❯ ls /sys/class/power_supply/ | grep -i ps
ps-controller-battery-8c:41:f2:0c:05:f0

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