Re: [PATCH v6 2/5] platform/x86: uniwill-laptop: Implement USB-C power priority setting

[Werner Sembach]

Hi Ilpo,

Am 24.03.26 um 14:08 schrieb Ilpo Järvinen:
> On Thu, 12 Mar 2026, Werner Sembach wrote:
>
> > On some devices Uniwill offers the option to set the USB-C port to
> > prioritise charging or performance. This patch exposes this setting to the
> > userspace via sysfs for all TUXEDO devices supporting it.
> >
> > Signed-off-by: Werner Sembach <wse@xxxxxxxxxxxxxxxxxxx>
> > Reviewed-by: Armin Wolf <W_Armin@xxxxxx>
> > ---
> >   drivers/platform/x86/uniwill/uniwill-acpi.c | 145 +++++++++++++++++++-
> >   1 file changed, 138 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/platform/x86/uniwill/uniwill-acpi.c b/drivers/platform/x86/uniwill/uniwill-acpi.c
> > index 048b265bff374..22ae5fccd6a06 100644
> > --- a/drivers/platform/x86/uniwill/uniwill-acpi.c
> > +++ b/drivers/platform/x86/uniwill/uniwill-acpi.c
> > @@ -266,8 +266,8 @@
> >   #define BATTERY_CHARGE_FULL_OVER_24H	BIT(3)
> >   #define BATTERY_ERM_STATUS_REACHED	BIT(4)
> >   
> > -#define EC_ADDR_CHARGE_PRIO		0x07CC
> > -#define CHARGING_PERFORMANCE		BIT(7)
> > +#define EC_ADDR_USB_C_POWER_PRIORITY	0x07CC
> > +#define USB_C_POWER_PRIORITY		BIT(7)
> >   
> >   /* Same bits as EC_ADDR_LIGHTBAR_AC_CTRL except LIGHTBAR_S3_OFF */
> >   #define EC_ADDR_LIGHTBAR_BAT_CTRL	0x07E2
> > @@ -324,6 +324,12 @@
> >   #define UNIWILL_FEATURE_PRIMARY_FAN		BIT(7)
> >   #define UNIWILL_FEATURE_SECONDARY_FAN		BIT(8)
> >   #define UNIWILL_FEATURE_NVIDIA_CTGP_CONTROL	BIT(9)
> > +#define UNIWILL_FEATURE_USB_C_POWER_PRIORITY	BIT(10)
> > +
> > +enum usb_c_power_priority_options {
> > +	USB_C_POWER_PRIORITY_CHARGING = 0,
> > +	USB_C_POWER_PRIORITY_PERFORMANCE,
> > +};
> >   
> >   struct uniwill_data {
> >   	struct device *dev;
> > @@ -343,6 +349,8 @@ struct uniwill_data {
> >   	struct mutex input_lock;	/* Protects input sequence during notify */
> >   	struct input_dev *input_device;
> >   	struct notifier_block nb;
> > +	struct mutex usb_c_power_priority_lock; /* Protects dependent bit write and state safe */
> > +	enum usb_c_power_priority_options last_usb_c_power_priority_option;
> >   };
> >   
> >   struct uniwill_battery_entry {
> > @@ -527,6 +535,7 @@ static bool uniwill_writeable_reg(struct device *dev, unsigned int reg)
> >   	case EC_ADDR_CTGP_DB_CTGP_OFFSET:
> >   	case EC_ADDR_CTGP_DB_TPP_OFFSET:
> >   	case EC_ADDR_CTGP_DB_DB_OFFSET:
> > +	case EC_ADDR_USB_C_POWER_PRIORITY:
> >   		return true;
> >   	default:
> >   		return false;
> > @@ -565,6 +574,7 @@ static bool uniwill_readable_reg(struct device *dev, unsigned int reg)
> >   	case EC_ADDR_CTGP_DB_CTGP_OFFSET:
> >   	case EC_ADDR_CTGP_DB_TPP_OFFSET:
> >   	case EC_ADDR_CTGP_DB_DB_OFFSET:
> > +	case EC_ADDR_USB_C_POWER_PRIORITY:
> >   		return true;
> >   	default:
> >   		return false;
> > @@ -587,6 +597,7 @@ static bool uniwill_volatile_reg(struct device *dev, unsigned int reg)
> >   	case EC_ADDR_TRIGGER:
> >   	case EC_ADDR_SWITCH_STATUS:
> >   	case EC_ADDR_CHARGE_CTRL:
> > +	case EC_ADDR_USB_C_POWER_PRIORITY:
> >   		return true;
> >   	default:
> >   		return false;
> > @@ -883,6 +894,104 @@ static int uniwill_nvidia_ctgp_init(struct uniwill_data *data)
> >   	return 0;
> >   }
> >   
> > +static const char * const USB_C_POWER_PRIORITY_TEXT[] = {
> > +static const u8 USB_C_POWER_PRIORITY_VALUE[] = {
> These two arrays need to be lowercase as they're not macros.

I copied a design pattern if found here for example: 
https://elixir.bootlin.com/linux/v6.19.9/source/drivers/power/supply/power_supply_sysfs.c#L63

But ofc can lower case it.

Best regards,

Werner

> --
>   i.