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Message-ID: <zl6ukxdcscxqkpqodjkocfljolnoz2pep74zbu2iy5e7itm3lr@zavcqwt5iyaw>
Date: Thu, 26 Dec 2024 23:44:52 -0500
From: Kurt Borja <kuurtb@...il.com>
To: Armin Wolf <W_Armin@....de>
Cc: platform-driver-x86@...r.kernel.org, ilpo.jarvinen@...ux.intel.com,
mario.limonciello@....com, hdegoede@...hat.com, linux-kernel@...r.kernel.org,
Dell.Client.Kernel@...l.com
Subject: Re: [PATCH 08/20] alienware-wmi: Add WMI Drivers
On Fri, Dec 27, 2024 at 04:21:14AM +0100, Armin Wolf wrote:
> Am 21.12.24 um 06:59 schrieb Kurt Borja:
>
> > Add WMI drivers for LEGACY and WMAX devices.
> >
> > This involves moving platform driver and device registration to a helper
> > function, which is now called from the driver's preferred WMI device
> > driver probe. However this is only done if !quirks->thermal because
> > newer WMAX interface doesn't support any of the features exposed by this
> > device.
> >
> > Only one driver is registered on module initialization to prevent
> > registering duplicate platform driver and device.
> >
> > Aditionally, create_thermal_profile() now takes wmi_device * instead of
> > platform_device *.
>
> Since the HDMI, Amplifier and deepslp groups depend on the WMAX interface i would
> register them inside wmax_wmi_probe() using device_add_groups() (you might need to
> rework alienware_alienfx_setup() for that).
>
> In the end the only code shared between both drivers should be related to the LED handling.
> Everything else AFAIK depends on the WMAX interface and should therefore be inside the
> WMAX driver.
Unfortunately this breaks old user-space interface, as the path to this
attributes would change :(. This is why I can't even set a parent dev
for the platform_device.
I only know of one project which interefaces with this driver [1], and
it does use the /sys/devices/platform/alienware-wmi path. Maybe I could
send a pull req, but it would still break old unknown projects and
scripts.
[1] https://crates.io/crates/alienware
>
> Thanks,
> Armin Wolf
>
> >
> > Signed-off-by: Kurt Borja <kuurtb@...il.com>
> > ---
> > drivers/platform/x86/dell/alienware-wmi.c | 186 +++++++++++++++++-----
> > 1 file changed, 146 insertions(+), 40 deletions(-)
> >
> > diff --git a/drivers/platform/x86/dell/alienware-wmi.c b/drivers/platform/x86/dell/alienware-wmi.c
> > index 4b68d64bd742..f2f6842e27e6 100644
> > --- a/drivers/platform/x86/dell/alienware-wmi.c
> > +++ b/drivers/platform/x86/dell/alienware-wmi.c
> > @@ -15,6 +15,7 @@
> > #include <linux/platform_profile.h>
> > #include <linux/dmi.h>
> > #include <linux/leds.h>
> > +#include <linux/wmi.h>
> >
> > #define LEGACY_CONTROL_GUID "A90597CE-A997-11DA-B012-B622A1EF5492"
> > #define LEGACY_POWER_CONTROL_GUID "A80593CE-A997-11DA-B012-B622A1EF5492"
> > @@ -39,8 +40,6 @@
> > MODULE_AUTHOR("Mario Limonciello <mario.limonciello@...look.com>");
> > MODULE_DESCRIPTION("Alienware special feature control");
> > MODULE_LICENSE("GPL");
> > -MODULE_ALIAS("wmi:" LEGACY_CONTROL_GUID);
> > -MODULE_ALIAS("wmi:" WMAX_CONTROL_GUID);
> >
> > static bool force_platform_profile;
> > module_param_unsafe(force_platform_profile, bool, 0);
> > @@ -412,7 +411,10 @@ struct alienfx_priv {
> > u8 lighting_control_state;
> > };
> >
> > -static struct platform_device *platform_device;
> > +struct alienfx_platdata {
> > + struct wmi_device *wdev;
> > +};
> > +
> > static struct platform_profile_handler pp_handler;
> > static enum wmax_thermal_mode supported_thermal_profiles[PLATFORM_PROFILE_LAST];
> >
> > @@ -1048,7 +1050,7 @@ static int thermal_profile_set(struct platform_profile_handler *pprof,
> > return wmax_thermal_control(supported_thermal_profiles[profile]);
> > }
> >
> > -static int create_thermal_profile(struct platform_device *platform_device)
> > +static int create_thermal_profile(struct wmi_device *wdev)
> > {
> > enum platform_profile_option profile;
> > enum wmax_thermal_mode mode;
> > @@ -1097,7 +1099,7 @@ static int create_thermal_profile(struct platform_device *platform_device)
> > pp_handler.profile_get = thermal_profile_get;
> > pp_handler.profile_set = thermal_profile_set;
> > pp_handler.name = "alienware-wmi";
> > - pp_handler.dev = &platform_device->dev;
> > + pp_handler.dev = &wdev->dev;
> >
> > return platform_profile_register(&pp_handler);
> > }
> > @@ -1153,19 +1155,138 @@ static struct platform_driver platform_driver = {
> > .probe = alienfx_probe,
> > };
> >
> > -static int __init alienware_wmi_init(void)
> > +static int alienware_alienfx_setup(struct alienfx_platdata *pdata)
> > {
> > + struct platform_device *pdev;
> > int ret;
> >
> > - if (wmi_has_guid(LEGACY_CONTROL_GUID))
> > - interface = LEGACY;
> > - else if (wmi_has_guid(WMAX_CONTROL_GUID))
> > - interface = WMAX;
> > - else {
> > - pr_warn("alienware-wmi: No known WMI GUID found\n");
> > - return -ENODEV;
> > + ret = platform_driver_register(&platform_driver);
> > + if (ret < 0)
> > + return ret;
> > +
> > + pdev = platform_device_register_data(NULL, "alienware-wmi",
> > + PLATFORM_DEVID_NONE, pdata,
> > + sizeof(*pdata));
> > +
> > + if (IS_ERR(pdev)) {
> > + platform_driver_unregister(&platform_driver);
> > + return PTR_ERR(pdev);
> > }
> >
> > + dev_set_drvdata(&pdata->wdev->dev, pdev);
> > +
> > + return 0;
> > +}
> > +
> > +static void alienware_alienfx_exit(struct wmi_device *wdev)
> > +{
> > + struct platform_device *pdev;
> > +
> > + pdev = dev_get_drvdata(&wdev->dev);
> > +
> > + platform_device_unregister(pdev);
> > + platform_driver_unregister(&platform_driver);
> > +}
> > +
> > +/*
> > + * Legacy WMI driver
> > + */
> > +static int legacy_wmi_probe(struct wmi_device *wdev, const void *context)
> > +{
> > + struct alienfx_platdata pdata = {
> > + .wdev = wdev,
> > + };
> > +
> > + return alienware_alienfx_setup(&pdata);
> > +}
> > +
> > +static void legacy_wmi_remove(struct wmi_device *wdev)
> > +{
> > + alienware_alienfx_exit(wdev);
> > +}
> > +
> > +static struct wmi_device_id alienware_legacy_device_id_table[] = {
> > + { LEGACY_CONTROL_GUID, NULL },
> > + { },
> > +};
> > +MODULE_DEVICE_TABLE(wmi, alienware_legacy_device_id_table);
> > +
> > +static struct wmi_driver alienware_legacy_wmi_driver = {
> > + .driver = {
> > + .name = "alienware-wmi-alienfx",
> > + .probe_type = PROBE_PREFER_ASYNCHRONOUS,
> > + },
> > + .id_table = alienware_legacy_device_id_table,
> > + .probe = legacy_wmi_probe,
> > + .remove = legacy_wmi_remove,
> > +};
> > +
> > +static int __init alienware_legacy_wmi_init(void)
> > +{
> > + return wmi_driver_register(&alienware_legacy_wmi_driver);
> > +}
> > +
> > +static void __exit alienware_legacy_wmi_exit(void)
> > +{
> > + wmi_driver_unregister(&alienware_legacy_wmi_driver);
> > +}
> > +
> > +/*
> > + * WMAX WMI driver
> > + */
> > +static int wmax_wmi_probe(struct wmi_device *wdev, const void *context)
> > +{
> > + struct alienfx_platdata pdata = {
> > + .wdev = wdev,
> > + };
> > + int ret = 0;
> > +
> > + if (quirks->thermal)
> > + ret = create_thermal_profile(wdev);
> > + else
> > + ret = alienware_alienfx_setup(&pdata);
> > +
> > + return ret;
> > +}
> > +
> > +static void wmax_wmi_remove(struct wmi_device *wdev)
> > +{
> > + if (quirks->thermal)
> > + remove_thermal_profile();
> > + else
> > + alienware_alienfx_exit(wdev);
> > +}
> > +
> > +static struct wmi_device_id alienware_wmax_device_id_table[] = {
> > + { WMAX_CONTROL_GUID, NULL },
> > + { },
> > +};
> > +MODULE_DEVICE_TABLE(wmi, alienware_wmax_device_id_table);
> > +
> > +static struct wmi_driver alienware_wmax_wmi_driver = {
> > + .driver = {
> > + .name = "alienware-wmi-wmax",
> > + .probe_type = PROBE_PREFER_ASYNCHRONOUS,
> > + },
> > + .id_table = alienware_wmax_device_id_table,
> > + .probe = wmax_wmi_probe,
> > + .remove = wmax_wmi_remove,
> > +};
> > +
> > +static int __init alienware_wmax_wmi_init(void)
> > +{
> > + return wmi_driver_register(&alienware_wmax_wmi_driver);
> > +}
> > +
> > +static void __exit alienware_wmax_wmi_exit(void)
> > +{
> > + wmi_driver_unregister(&alienware_wmax_wmi_driver);
> > +}
> > +
> > +static int __init alienware_wmi_init(void)
> > +{
> > + int ret;
> > +
> > dmi_check_system(alienware_quirks);
> > if (quirks == NULL)
> > quirks = &quirk_unknown;
> > @@ -1180,43 +1301,28 @@ static int __init alienware_wmi_init(void)
> > pr_warn("force_gmode requires platform profile support\n");
> > }
> >
> > - ret = platform_driver_register(&platform_driver);
> > - if (ret)
> > - goto fail_platform_driver;
> > - platform_device = platform_device_alloc("alienware-wmi", PLATFORM_DEVID_NONE);
> > - if (!platform_device) {
> > - ret = -ENOMEM;
> > - goto fail_platform_device1;
> > + if (wmi_has_guid(WMAX_CONTROL_GUID)) {
> > + interface = WMAX;
> > + ret = alienware_wmax_wmi_init();
> > + } else {
> > + interface = LEGACY;
> > + ret = alienware_legacy_wmi_init();
> > }
> > - ret = platform_device_add(platform_device);
> > - if (ret)
> > - goto fail_platform_device2;
> >
> > - if (quirks->thermal) {
> > - ret = create_thermal_profile(platform_device);
> > - if (ret)
> > - goto fail_prep_thermal_profile;
> > - }
> > + if (ret < 0)
> > + return ret;
> >
> > return 0;
> > -
> > -fail_prep_thermal_profile:
> > - platform_device_del(platform_device);
> > -fail_platform_device2:
> > - platform_device_put(platform_device);
> > -fail_platform_device1:
> > - platform_driver_unregister(&platform_driver);
> > -fail_platform_driver:
> > - return ret;
> > }
> >
> > module_init(alienware_wmi_init);
> >
> > static void __exit alienware_wmi_exit(void)
> > {
> > - remove_thermal_profile();
> > - platform_device_unregister(platform_device);
> > - platform_driver_unregister(&platform_driver);
> > + if (interface == WMAX)
> > + alienware_wmax_wmi_exit();
> > + else
> > + alienware_legacy_wmi_exit();
> > }
> >
> > module_exit(alienware_wmi_exit);
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