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Message-ID: <djj7twl5wvc53ldb7qotz3dnn2eprq3c657t6xleffajugv4qf@gj3advwy3f4w>
Date: Thu, 5 Dec 2024 09:50:57 -0300
From: Kurt Borja <kuurtb@...il.com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Dell.Client.Kernel@...l.com, Hans de Goede <hdegoede@...hat.com>,
LKML <linux-kernel@...r.kernel.org>, mario.limonciello@....com, platform-driver-x86@...r.kernel.org,
w_armin@....de
Subject: Re: [RFC PATCH 10/21] alienware-wmi: Add alienfx OPs to platdata
On Thu, Dec 05, 2024 at 01:05:50PM +0200, Ilpo Järvinen wrote:
> On Wed, 4 Dec 2024, Kurt Borja wrote:
>
> > 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
> > wmidev_* methods, let the WMI drivers present a single interface through
> > this "alienfx operations".
> >
> > 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 and makes use of
> > non-deprecated WMI methods.
> >
> > Signed-off-by: Kurt Borja <kuurtb@...il.com>
> > ---
> > drivers/platform/x86/dell/alienware-wmi.c | 110 ++++++++++++++++++++++
> > 1 file changed, 110 insertions(+)
> >
> > diff --git a/drivers/platform/x86/dell/alienware-wmi.c b/drivers/platform/x86/dell/alienware-wmi.c
> > index 34fb59a14bc0..043cde40de9a 100644
> > --- a/drivers/platform/x86/dell/alienware-wmi.c
> > +++ b/drivers/platform/x86/dell/alienware-wmi.c
> > @@ -411,8 +411,16 @@ 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 struct platform_profile_handler pp_handler;
> > @@ -421,6 +429,32 @@ static enum wmax_thermal_mode supported_thermal_profiles[PLATFORM_PROFILE_LAST];
> > static u8 interface;
> > static struct wmi_driver *preferred_wmi_driver;
> >
> > +static acpi_status alienware_wmi_command(struct wmi_device *wdev, u32 method_id,
> > + void *in_args, size_t in_size, u32 *out_data)
> > +{
> > + acpi_status ret;
> > + union acpi_object *obj;
>
> > + struct acpi_buffer in = { in_size, in_args };
> > + struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
>
> Extra whitespace on both lines.
Ack.
>
> > +
> > + if (out_data) {
> > + ret = wmidev_evaluate_method(wdev, 0, method_id, &in, &out);
> > + if (ACPI_FAILURE(ret))
> > + goto out_free_ptr;
> > +
> > + obj = (union acpi_object *) out.pointer;
>
> The usual style for casts is without space but not an end of the world if
> you want to have the space there (in any case, it's not explicitly stated
> in coding style).
Just personal preference, but I'll stick with the usual style!
>
> > +
> > + if (obj && obj->type == ACPI_TYPE_INTEGER)
> > + *out_data = (u32) obj->integer.value;
> > + } else {
> > + ret = wmidev_evaluate_method(wdev, 0, method_id, &in, NULL);
> > + }
> > +
> > +out_free_ptr:
> > + kfree(out.pointer);
> > + return ret;
> > +}
> > +
> > /*
> > * Helpers used for zone control
> > */
> > @@ -1178,11 +1212,48 @@ static void alienfx_wmi_exit(struct wmi_device *wdev)
> > /*
> > * Legacy WMI device
> > */
> > +static int legacy_wmi_update_led(struct alienfx_priv *priv,
> > + struct wmi_device *wdev, u8 location)
> > +{
> > + acpi_status status;
> > + struct acpi_buffer input;
> > + struct legacy_led_args legacy_args;
>
> Mostly try to abide the reverse xmas tree order (but if there's
> dependency, feel free to violate it where it makes sense).
Ack.
>
> --
> i.
>
> > + legacy_args.colors = priv->colors[location];
> > + legacy_args.brightness = priv->global_brightness;
> > + legacy_args.state = priv->lighting_control_state;
> > +
> > + input.length = sizeof(legacy_args);
> > + input.pointer = &legacy_args;
> > +
> > + if (legacy_args.state == LEGACY_RUNNING)
> > + status = alienware_wmi_command(wdev, location + 1, &legacy_args,
> > + sizeof(legacy_args), NULL);
> > + else
> > + status = wmi_evaluate_method(LEGACY_POWER_CONTROL_GUID, 0,
> > + location + 1, &input, NULL);
> > +
> > + if (ACPI_FAILURE(status))
> > + return -EIO;
> > +
> > + return 0;
> > +}
> > +
> > +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)
> > {
> > int ret = 0;
> > struct alienfx_platdata pdata = {
> > .wdev = wdev,
> > + .ops = {
> > + .upd_led = legacy_wmi_update_led,
> > + .upd_brightness = legacy_wmi_update_brightness,
> > + },
> > };
> >
> > if (quirks->num_zones > 0)
> > @@ -1219,11 +1290,50 @@ static struct wmi_driver alienware_legacy_wmi_driver = {
> > /*
> > * WMAX WMI device
> > */
> > +static int wmax_wmi_update_led(struct alienfx_priv *priv,
> > + struct wmi_device *wdev, u8 location)
> > +{
> > + acpi_status status;
> > + struct wmax_led_args in_args = {
> > + .led_mask = 1 << location,
> > + .colors = priv->colors[location],
> > + .state = priv->lighting_control_state,
> > + };
> > +
> > + status = alienware_wmi_command(wdev, WMAX_METHOD_ZONE_CONTROL,
> > + &in_args, sizeof(in_args), NULL);
> > + if (ACPI_FAILURE(status))
> > + return -EIO;
> > +
> > + return 0;
> > +}
> > +
> > +static int wmax_wmi_update_brightness(struct alienfx_priv *priv,
> > + struct wmi_device *wdev, u8 brightness)
> > +{
> > + acpi_status status;
> > + struct wmax_brightness_args in_args = {
> > + .led_mask = 0xFF,
> > + .percentage = brightness,
> > + };
> > +
> > + status = alienware_wmi_command(wdev, WMAX_METHOD_BRIGHTNESS, &in_args,
> > + sizeof(in_args), NULL);
> > + if (ACPI_FAILURE(status))
> > + return -EIO;
> > +
> > + return 0;
> > +}
> > +
> > static int wmax_wmi_probe(struct wmi_device *wdev, const void *context)
> > {
> > int ret = 0;
> > struct alienfx_platdata pdata = {
> > .wdev = wdev,
> > + .ops = {
> > + .upd_led = wmax_wmi_update_led,
> > + .upd_brightness = wmax_wmi_update_brightness,
> > + },
> > };
> >
> > if (quirks->thermal)
> >
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