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Message-ID: <wqpg2s73tasnrqepdpho3bhjok6ayxi7m4l2fwlpoz2sleajqq@2au7w7nhghra>
Date: Thu, 2 Jan 2025 14:36:49 -0500
From: Kurt Borja <kuurtb@...il.com>
To: Armin Wolf <W_Armin@....de>
Cc: platform-driver-x86@...r.kernel.org, Dell.Client.Kernel@...l.com,
hdegoede@...hat.com, ilpo.jarvinen@...ux.intel.com, linux-kernel@...r.kernel.org,
mario.limonciello@....com
Subject: Re: [PATCH v2 10/20] alienware-wmi: Refactor LED control methods
On Thu, Jan 02, 2025 at 05:29:42PM +0100, Armin Wolf wrote:
> Am 29.12.24 um 20:44 schrieb Kurt Borja:
>
> > 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.
> >
> > Signed-off-by: Kurt Borja <kuurtb@...il.com>
> > ---
> > drivers/platform/x86/dell/alienware-wmi.c | 164 ++++++++++++++--------
> > 1 file changed, 102 insertions(+), 62 deletions(-)
> >
> > diff --git a/drivers/platform/x86/dell/alienware-wmi.c b/drivers/platform/x86/dell/alienware-wmi.c
> > index 512384635c4c..494a3772065c 100644
> > --- a/drivers/platform/x86/dell/alienware-wmi.c
> > +++ b/drivers/platform/x86/dell/alienware-wmi.c
> > @@ -418,12 +418,42 @@ 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};
> > + union acpi_object *obj;
> > + acpi_status ret;
> > +
> > + ret = wmidev_evaluate_method(wdev, 0, method_id, &in, out_data ? &out : NULL);
> > + if (ACPI_FAILURE(ret))
> > + return -EIO;
> > +
> > + obj = out.pointer;
> > +
> > + if (obj && obj->type == ACPI_TYPE_INTEGER) {
> > + *out_data = (u32)obj->integer.value;
> > + kfree(out.pointer);
>
> If obj->type is not ACPI_TYPE_INTEGER then we have a memory leak here, so please always free obj.
> Also you will dereference a NULL pointer if out_data is NULL, please check this.
I was a bit careless when refactoring this method, I'll fix it.
>
> Thanks,
> Armin Wolf
>
> > + }
> > +
> > + return 0;
> > +}
> > +
> > /*
> > * Helpers used for zone control
> > */
> > @@ -454,46 +484,6 @@ 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)
> > {
> > @@ -510,13 +500,14 @@ 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;
> > }
> > @@ -649,36 +640,17 @@ 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");
> > }
> > @@ -1247,10 +1219,49 @@ static void alienware_alienfx_exit(struct wmi_device *wdev)
> > /*
> > * 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);
> > @@ -1290,10 +1301,39 @@ 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,
> > + },
> > };
> > struct platform_device *pdev;
> > int ret;
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