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Message-ID: <cfe33020-5faa-c780-6d0a-6a6267070983@linux.intel.com>
Date: Tue, 16 Dec 2025 15:40:36 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Werner Sembach <wse@...edocomputers.com>
cc: W_Armin@....de, Hans de Goede <hansg@...nel.org>,
platform-driver-x86@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] platform/x86: uniwill-laptop: Introduce device
descriptor system
On Thu, 4 Dec 2025, Werner Sembach wrote:
> From: Armin Wolf <W_Armin@....de>
>
> Future additions to the driver will depend on device-specific
> initialization steps. Extend the DMI-based feature detection system
> to include device descriptors. Each descriptor contains a bitmap of
> supported features and a set of callback for performing
> device-specific initialization.
>
> Signed-off-by: Armin Wolf <W_Armin@....de>
> Co-developed-by: Werner Sembach <wse@...edocomputers.com>
> Signed-off-by: Werner Sembach <wse@...edocomputers.com>
> ---
> drivers/platform/x86/uniwill/uniwill-acpi.c | 168 +++++++++++++++++---
> 1 file changed, 142 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/platform/x86/uniwill/uniwill-acpi.c b/drivers/platform/x86/uniwill/uniwill-acpi.c
> index bd7e63dd51810..01192c32608e5 100644
> --- a/drivers/platform/x86/uniwill/uniwill-acpi.c
> +++ b/drivers/platform/x86/uniwill/uniwill-acpi.c
> @@ -322,6 +322,7 @@ struct uniwill_data {
> struct device *dev;
> acpi_handle handle;
> struct regmap *regmap;
> + unsigned int features;
> struct acpi_battery_hook hook;
> unsigned int last_charge_ctrl;
> struct mutex battery_lock; /* Protects the list of currently registered batteries */
> @@ -341,12 +342,21 @@ struct uniwill_battery_entry {
> struct power_supply *battery;
> };
>
> +struct uniwill_device_descriptor {
> + unsigned int features;
> + /* Executed during driver probing */
> + int (*probe)(struct uniwill_data *data);
> +};
> +
> static bool force;
> module_param_unsafe(force, bool, 0);
> MODULE_PARM_DESC(force, "Force loading without checking for supported devices\n");
>
> -/* Feature bitmask since the associated registers are not reliable */
> -static unsigned int supported_features;
> +/*
> + * Contains device specific data like the feature bitmap since
> + * the associated registers are not always reliable.
> + */
> +static struct uniwill_device_descriptor device_descriptor __ro_after_init;
>
> static const char * const uniwill_temp_labels[] = {
> "CPU",
> @@ -411,6 +421,13 @@ static const struct key_entry uniwill_keymap[] = {
> { KE_END }
> };
>
> +static inline bool uniwill_device_supports(struct uniwill_data *data,
> + unsigned int features_mask,
> + unsigned int features)
> +{
> + return (data->features & features_mask) == features;
> +}
> +
> static int uniwill_ec_reg_write(void *context, unsigned int reg, unsigned int val)
> {
> union acpi_object params[2] = {
> @@ -799,24 +816,31 @@ static struct attribute *uniwill_attrs[] = {
>
> static umode_t uniwill_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
> {
> + struct device *dev = kobj_to_dev(kobj);
> + struct uniwill_data *data = dev_get_drvdata(dev);
> +
> if (attr == &dev_attr_fn_lock_toggle_enable.attr) {
> - if (supported_features & UNIWILL_FEATURE_FN_LOCK_TOGGLE)
> + if (uniwill_device_supports(data, UNIWILL_FEATURE_FN_LOCK_TOGGLE,
> + UNIWILL_FEATURE_FN_LOCK_TOGGLE))
> return attr->mode;
> }
>
> if (attr == &dev_attr_super_key_toggle_enable.attr) {
> - if (supported_features & UNIWILL_FEATURE_SUPER_KEY_TOGGLE)
> + if (uniwill_device_supports(data, UNIWILL_FEATURE_SUPER_KEY_TOGGLE,
> + UNIWILL_FEATURE_SUPER_KEY_TOGGLE))
> return attr->mode;
> }
>
> if (attr == &dev_attr_touchpad_toggle_enable.attr) {
> - if (supported_features & UNIWILL_FEATURE_TOUCHPAD_TOGGLE)
> + if (uniwill_device_supports(data, UNIWILL_FEATURE_TOUCHPAD_TOGGLE,
> + UNIWILL_FEATURE_TOUCHPAD_TOGGLE))
> return attr->mode;
> }
>
> if (attr == &dev_attr_rainbow_animation.attr ||
> attr == &dev_attr_breathing_in_suspend.attr) {
> - if (supported_features & UNIWILL_FEATURE_LIGHTBAR)
> + if (uniwill_device_supports(data, UNIWILL_FEATURE_LIGHTBAR,
> + UNIWILL_FEATURE_LIGHTBAR))
> return attr->mode;
> }
>
> @@ -944,7 +968,8 @@ static int uniwill_hwmon_init(struct uniwill_data *data)
> {
> struct device *hdev;
>
> - if (!(supported_features & UNIWILL_FEATURE_HWMON))
> + if (!uniwill_device_supports(data, UNIWILL_FEATURE_HWMON,
> + UNIWILL_FEATURE_HWMON))
> return 0;
>
> hdev = devm_hwmon_device_register_with_info(data->dev, "uniwill", data,
> @@ -1019,7 +1044,8 @@ static int uniwill_led_init(struct uniwill_data *data)
> unsigned int value;
> int ret;
>
> - if (!(supported_features & UNIWILL_FEATURE_LIGHTBAR))
> + if (!uniwill_device_supports(data, UNIWILL_FEATURE_LIGHTBAR,
> + UNIWILL_FEATURE_LIGHTBAR))
> return 0;
>
> ret = devm_mutex_init(data->dev, &data->led_lock);
> @@ -1232,7 +1258,8 @@ static int uniwill_battery_init(struct uniwill_data *data)
> {
> int ret;
>
> - if (!(supported_features & UNIWILL_FEATURE_BATTERY))
> + if (!uniwill_device_supports(data, UNIWILL_FEATURE_BATTERY,
> + UNIWILL_FEATURE_BATTERY))
> return 0;
>
> ret = devm_mutex_init(data->dev, &data->battery_lock);
> @@ -1361,6 +1388,19 @@ static int uniwill_probe(struct platform_device *pdev)
> if (ret < 0)
> return ret;
>
> + data->features = device_descriptor.features;
> +
> + /*
> + * Some devices might need to perform some device-specific initialization steps
> + * before the supported features are initialized. Because of this we have to call
> + * this callback just after the EC itself was initialized.
> + */
> + if (device_descriptor.probe) {
> + ret = device_descriptor.probe(data);
> + if (ret < 0)
> + return ret;
> + }
> +
> ret = uniwill_battery_init(data);
> if (ret < 0)
> return ret;
> @@ -1385,7 +1425,8 @@ static void uniwill_shutdown(struct platform_device *pdev)
>
> static int uniwill_suspend_keyboard(struct uniwill_data *data)
> {
> - if (!(supported_features & UNIWILL_FEATURE_SUPER_KEY_TOGGLE))
> + if (!uniwill_device_supports(data, UNIWILL_FEATURE_SUPER_KEY_TOGGLE,
> + UNIWILL_FEATURE_SUPER_KEY_TOGGLE))
> return 0;
>
> /*
> @@ -1397,7 +1438,8 @@ static int uniwill_suspend_keyboard(struct uniwill_data *data)
>
> static int uniwill_suspend_battery(struct uniwill_data *data)
> {
> - if (!(supported_features & UNIWILL_FEATURE_BATTERY))
> + if (!uniwill_device_supports(data, UNIWILL_FEATURE_BATTERY,
> + UNIWILL_FEATURE_BATTERY))
> return 0;
>
> /*
> @@ -1432,7 +1474,8 @@ static int uniwill_resume_keyboard(struct uniwill_data *data)
> unsigned int value;
> int ret;
>
> - if (!(supported_features & UNIWILL_FEATURE_SUPER_KEY_TOGGLE))
> + if (!uniwill_device_supports(data, UNIWILL_FEATURE_SUPER_KEY_TOGGLE,
> + UNIWILL_FEATURE_SUPER_KEY_TOGGLE))
> return 0;
>
> ret = regmap_read(data->regmap, EC_ADDR_SWITCH_STATUS, &value);
> @@ -1448,7 +1491,8 @@ static int uniwill_resume_keyboard(struct uniwill_data *data)
>
> static int uniwill_resume_battery(struct uniwill_data *data)
> {
> - if (!(supported_features & UNIWILL_FEATURE_BATTERY))
> + if (!uniwill_device_supports(data, UNIWILL_FEATURE_BATTERY,
> + UNIWILL_FEATURE_BATTERY))
> return 0;
>
> return regmap_update_bits(data->regmap, EC_ADDR_CHARGE_CTRL, CHARGE_CTRL_MASK,
> @@ -1496,6 +1540,25 @@ static struct platform_driver uniwill_driver = {
> .shutdown = uniwill_shutdown,
> };
>
> +static struct uniwill_device_descriptor lapac71h_descriptor __initdata = {
> + .features = UNIWILL_FEATURE_FN_LOCK_TOGGLE |
> + UNIWILL_FEATURE_SUPER_KEY_TOGGLE |
> + UNIWILL_FEATURE_TOUCHPAD_TOGGLE |
> + UNIWILL_FEATURE_BATTERY |
> + UNIWILL_FEATURE_HWMON
> +};
> +
> +static struct uniwill_device_descriptor lapkc71f_descriptor __initdata = {
> + .features = UNIWILL_FEATURE_FN_LOCK_TOGGLE |
> + UNIWILL_FEATURE_SUPER_KEY_TOGGLE |
> + UNIWILL_FEATURE_TOUCHPAD_TOGGLE |
> + UNIWILL_FEATURE_LIGHTBAR |
> + UNIWILL_FEATURE_BATTERY |
> + UNIWILL_FEATURE_HWMON
> +};
> +
> +static struct uniwill_device_descriptor empty_descriptor __initdata = {};
> +
> static const struct dmi_system_id uniwill_dmi_table[] __initconst = {
> {
> .ident = "XMG FUSION 15",
> @@ -1503,6 +1566,7 @@ static const struct dmi_system_id uniwill_dmi_table[] __initconst = {
> DMI_MATCH(DMI_SYS_VENDOR, "SchenkerTechnologiesGmbH"),
> DMI_EXACT_MATCH(DMI_BOARD_NAME, "LAPQC71A"),
> },
> + .driver_data = &empty_descriptor,
Hi,
Is there some advantage of having an "empty descriptor" over just NULL
checking its presence in the code?
> static int __init uniwill_init(void)
> {
> + const struct uniwill_device_descriptor *descriptor;
> const struct dmi_system_id *id;
> int ret;
>
> @@ -1880,10 +1984,22 @@ static int __init uniwill_init(void)
> return -ENODEV;
>
> /* Assume that the device supports all features */
> - supported_features = UINT_MAX;
> + device_descriptor.features = UINT_MAX;
> pr_warn("Loading on a potentially unsupported device\n");
> } else {
> - supported_features = (uintptr_t)id->driver_data;
> + /*
> + * Some devices might support additional features depending on
> + * the BIOS version/date, so we call this callback to let them
> + * modify their device descriptor accordingly.
> + */
> + if (id->callback) {
> + ret = id->callback(id);
> + if (ret < 0)
> + return ret;
> + }
> +
> + descriptor = id->driver_data;
> + device_descriptor = *descriptor;
> }
>
> ret = platform_driver_register(&uniwill_driver);
>
--
i.
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