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Mon, 03 Feb 2025 10:27:29 -0800 (PST) From: Kurt Borja To: platform-driver-x86@vger.kernel.org Cc: =?utf-8?q?Ilpo_J=C3=A4rvinen?= , "Armin Wolf" , "Mario Limonciello" , "Hans de Goede" , Dell.Client.Kernel@dell.com, linux-kernel@vger.kernel.org, "Kurt Borja" Subject: [PATCH v8 04/14] platform/x86: alienware-wmi: Refactor LED control methods Date: Mon, 3 Feb 2025 13:27:03 -0500 Message-ID: <20250203182713.27446-5-kuurtb@gmail.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250203182713.27446-1-kuurtb@gmail.com> References: <20250203182713.27446-1-kuurtb@gmail.com> Precedence: bulk X-Mailing-List: platform-driver-x86@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Both WMI devices handled by this module specify a distinct interface for LED control. Previously this module handled this by dynamically adapting arguments passed to wmi_evaluate_method() based on the `interface` global variable. To avoid the use of global variables, and enable the migration to non-deprecated WMI methods, let the WMI drivers define upd_led and upd_brightness operations, which completely replace alienware_update_led() and wmax_brightness(). Also define alienware_wmi_command(), which serves as a wrapper for wmidev_evaluate_method(). This new method is very similar to alienware_wmax_command() but is WMI device agnostic. Reviewed-by: Armin Wolf Signed-off-by: Kurt Borja --- drivers/platform/x86/dell/alienware-wmi.c | 166 ++++++++++++++-------- 1 file changed, 104 insertions(+), 62 deletions(-) diff --git a/drivers/platform/x86/dell/alienware-wmi.c b/drivers/platform/x86/dell/alienware-wmi.c index 9512143c82ec..525d25a1fa6c 100644 --- a/drivers/platform/x86/dell/alienware-wmi.c +++ b/drivers/platform/x86/dell/alienware-wmi.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -426,12 +427,43 @@ struct alienfx_priv { u8 lighting_control_state; }; +struct alienfx_ops { + int (*upd_led)(struct alienfx_priv *priv, struct wmi_device *wdev, + u8 location); + int (*upd_brightness)(struct alienfx_priv *priv, struct wmi_device *wdev, + u8 brightness); +}; + struct alienfx_platdata { struct wmi_device *wdev; + struct alienfx_ops ops; }; static u8 interface; +static int alienware_wmi_command(struct wmi_device *wdev, u32 method_id, + void *in_args, size_t in_size, u32 *out_data) +{ + struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL}; + struct acpi_buffer in = {in_size, in_args}; + acpi_status ret; + + ret = wmidev_evaluate_method(wdev, 0, method_id, &in, out_data ? &out : NULL); + if (ACPI_FAILURE(ret)) + return -EIO; + + union acpi_object *obj __free(kfree) = out.pointer; + + if (out_data) { + if (obj && obj->type == ACPI_TYPE_INTEGER) + *out_data = (u32)obj->integer.value; + else + return -ENOMSG; + } + + return 0; +} + /* * Helpers used for zone control */ @@ -462,46 +494,6 @@ static int parse_rgb(const char *buf, struct color_platform *colors) /* * Individual RGB zone control */ -static int alienware_update_led(struct alienfx_priv *priv, u8 location) -{ - int method_id; - acpi_status status; - char *guid; - struct acpi_buffer input; - struct legacy_led_args legacy_args; - struct wmax_led_args wmax_basic_args; - if (interface == WMAX) { - wmax_basic_args.led_mask = 1 << location; - wmax_basic_args.colors = priv->colors[location]; - wmax_basic_args.state = priv->lighting_control_state; - guid = WMAX_CONTROL_GUID; - method_id = WMAX_METHOD_ZONE_CONTROL; - - input.length = sizeof(wmax_basic_args); - input.pointer = &wmax_basic_args; - } else { - legacy_args.colors = priv->colors[location]; - legacy_args.brightness = priv->global_brightness; - legacy_args.state = 0; - if (priv->lighting_control_state == LEGACY_BOOTING || - priv->lighting_control_state == LEGACY_SUSPEND) { - guid = LEGACY_POWER_CONTROL_GUID; - legacy_args.state = priv->lighting_control_state; - } else - guid = LEGACY_CONTROL_GUID; - method_id = location + 1; - - input.length = sizeof(legacy_args); - input.pointer = &legacy_args; - } - pr_debug("alienware-wmi: guid %s method %d\n", guid, method_id); - - status = wmi_evaluate_method(guid, 0, method_id, &input, NULL); - if (ACPI_FAILURE(status)) - pr_err("alienware-wmi: zone set failure: %u\n", status); - return ACPI_FAILURE(status); -} - static ssize_t zone_show(struct device *dev, struct device_attribute *attr, char *buf, u8 location) { @@ -518,13 +510,14 @@ static ssize_t zone_store(struct device *dev, struct device_attribute *attr, { struct alienfx_priv *priv = dev_get_drvdata(dev); struct color_platform *colors = &priv->colors[location]; + struct alienfx_platdata *pdata = dev_get_platdata(dev); int ret; ret = parse_rgb(buf, colors); if (ret) return ret; - ret = alienware_update_led(priv, location); + ret = pdata->ops.upd_led(priv, pdata->wdev, location); return ret ? ret : count; } @@ -660,36 +653,17 @@ static struct attribute_group zone_attribute_group = { /* * LED Brightness (Global) */ -static int wmax_brightness(int brightness) -{ - acpi_status status; - struct acpi_buffer input; - struct wmax_brightness_args args = { - .led_mask = 0xFF, - .percentage = brightness, - }; - input.length = sizeof(args); - input.pointer = &args; - status = wmi_evaluate_method(WMAX_CONTROL_GUID, 0, - WMAX_METHOD_BRIGHTNESS, &input, NULL); - if (ACPI_FAILURE(status)) - pr_err("alienware-wmi: brightness set failure: %u\n", status); - return ACPI_FAILURE(status); -} - static void global_led_set(struct led_classdev *led_cdev, enum led_brightness brightness) { struct alienfx_priv *priv = container_of(led_cdev, struct alienfx_priv, global_led); + struct alienfx_platdata *pdata = dev_get_platdata(&priv->pdev->dev); int ret; priv->global_brightness = brightness; - if (interface == WMAX) - ret = wmax_brightness(brightness); - else - ret = alienware_update_led(priv, 0); + ret = pdata->ops.upd_brightness(priv, pdata->wdev, brightness); if (ret) pr_err("LED brightness update failed\n"); } @@ -1249,10 +1223,49 @@ static int alienware_alienfx_setup(struct alienfx_platdata *pdata) /* * Legacy WMI driver */ +static int legacy_wmi_update_led(struct alienfx_priv *priv, + struct wmi_device *wdev, u8 location) +{ + struct legacy_led_args legacy_args = { + .colors = priv->colors[location], + .brightness = priv->global_brightness, + .state = 0, + }; + struct acpi_buffer input; + acpi_status status; + + if (legacy_args.state != LEGACY_RUNNING) { + legacy_args.state = priv->lighting_control_state; + + input.length = sizeof(legacy_args); + input.pointer = &legacy_args; + + status = wmi_evaluate_method(LEGACY_POWER_CONTROL_GUID, 0, + location + 1, &input, NULL); + if (ACPI_FAILURE(status)) + return -EIO; + + return 0; + } + + return alienware_wmi_command(wdev, location + 1, &legacy_args, + sizeof(legacy_args), NULL); +} + +static int legacy_wmi_update_brightness(struct alienfx_priv *priv, + struct wmi_device *wdev, u8 brightness) +{ + return legacy_wmi_update_led(priv, wdev, 0); +} + static int legacy_wmi_probe(struct wmi_device *wdev, const void *context) { struct alienfx_platdata pdata = { .wdev = wdev, + .ops = { + .upd_led = legacy_wmi_update_led, + .upd_brightness = legacy_wmi_update_brightness, + }, }; return alienware_alienfx_setup(&pdata); @@ -1287,10 +1300,39 @@ static void __exit alienware_legacy_wmi_exit(void) /* * WMAX WMI driver */ +static int wmax_wmi_update_led(struct alienfx_priv *priv, + struct wmi_device *wdev, u8 location) +{ + struct wmax_led_args in_args = { + .led_mask = 1 << location, + .colors = priv->colors[location], + .state = priv->lighting_control_state, + }; + + return alienware_wmi_command(wdev, WMAX_METHOD_ZONE_CONTROL, &in_args, + sizeof(in_args), NULL); +} + +static int wmax_wmi_update_brightness(struct alienfx_priv *priv, + struct wmi_device *wdev, u8 brightness) +{ + struct wmax_brightness_args in_args = { + .led_mask = 0xFF, + .percentage = brightness, + }; + + return alienware_wmi_command(wdev, WMAX_METHOD_BRIGHTNESS, &in_args, + sizeof(in_args), NULL); +} + static int wmax_wmi_probe(struct wmi_device *wdev, const void *context) { struct alienfx_platdata pdata = { .wdev = wdev, + .ops = { + .upd_led = wmax_wmi_update_led, + .upd_brightness = wmax_wmi_update_brightness, + }, }; int ret;