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Message-ID: <fz3qdng6vvlfmncxosqmlswhxu36yplg7h6igeaipdqfao2tgl@bymtliqzw5sw>
Date: Thu, 2 Jan 2025 13:45:16 -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 07/20] alienware-wmi: Add a state container for LED
control feature
On Thu, Jan 02, 2025 at 05:07:16PM +0100, Armin Wolf wrote:
> Am 29.12.24 um 20:44 schrieb Kurt Borja:
>
> > Add a state container for the "alienware-wmi" platform device and
> > initialize it on the new alienfx_probe(). Migrate all LED control functions
> > to use this state container, as well as hdmi, amplifier, deepslp group
> > visibility methods, to support upcoming file split.
> >
> > Additionally move the led_classdev registration to the platform driver
> > probe and make it device managed.
> >
> > Drop alienware_zone_init() and alienware_zone_exit() because they are no
> > longer needed.
> >
> > Signed-off-by: Kurt Borja <kuurtb@...il.com>
> > ---
> > drivers/platform/x86/dell/alienware-wmi.c | 135 +++++++++++++---------
> > 1 file changed, 79 insertions(+), 56 deletions(-)
> >
> > diff --git a/drivers/platform/x86/dell/alienware-wmi.c b/drivers/platform/x86/dell/alienware-wmi.c
> > index 2c17160473a6..88d4046ed45f 100644
> > --- a/drivers/platform/x86/dell/alienware-wmi.c
> > +++ b/drivers/platform/x86/dell/alienware-wmi.c
> > @@ -404,14 +404,20 @@ struct wmax_u32_args {
> > u8 arg3;
> > };
> >
> > +struct alienfx_priv {
> > + struct platform_device *pdev;
> > + struct quirk_entry *quirks;
> > + struct led_classdev global_led;
> > + struct color_platform colors[4];
> > + u8 global_brightness;
> > + u8 lighting_control_state;
> > +};
> > +
> > static struct platform_device *platform_device;
> > -static struct color_platform colors[4];
> > static struct platform_profile_handler pp_handler;
> > static enum wmax_thermal_mode supported_thermal_profiles[PLATFORM_PROFILE_LAST];
> >
> > static u8 interface;
> > -static u8 lighting_control_state;
> > -static u8 global_brightness;
> >
> > /*
> > * Helpers used for zone control
> > @@ -443,7 +449,7 @@ static int parse_rgb(const char *buf, struct color_platform *colors)
> > /*
> > * Individual RGB zone control
> > */
> > -static int alienware_update_led(u8 location)
> > +static int alienware_update_led(struct alienfx_priv *priv, u8 location)
> > {
> > int method_id;
> > acpi_status status;
> > @@ -453,21 +459,21 @@ static int alienware_update_led(u8 location)
> > struct wmax_led_args wmax_basic_args;
> > if (interface == WMAX) {
> > wmax_basic_args.led_mask = 1 << location;
> > - wmax_basic_args.colors = colors[location];
> > - wmax_basic_args.state = lighting_control_state;
> > + 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 = colors[location];
> > - legacy_args.brightness = global_brightness;
> > + legacy_args.colors = priv->colors[location];
> > + legacy_args.brightness = priv->global_brightness;
> > legacy_args.state = 0;
> > - if (lighting_control_state == LEGACY_BOOTING ||
> > - lighting_control_state == LEGACY_SUSPEND) {
> > + if (priv->lighting_control_state == LEGACY_BOOTING ||
> > + priv->lighting_control_state == LEGACY_SUSPEND) {
> > guid = LEGACY_POWER_CONTROL_GUID;
> > - legacy_args.state = lighting_control_state;
> > + legacy_args.state = priv->lighting_control_state;
> > } else
> > guid = LEGACY_CONTROL_GUID;
> > method_id = location + 1;
> > @@ -486,22 +492,26 @@ static int alienware_update_led(u8 location)
> > static ssize_t zone_show(struct device *dev, struct device_attribute *attr,
> > char *buf, u8 location)
> > {
> > + struct alienfx_priv *priv = dev_get_drvdata(dev);
> > + struct color_platform *colors = &priv->colors[location];
> > +
> > return sprintf(buf, "red: %d, green: %d, blue: %d\n",
> > - colors[location].red, colors[location].green,
> > - colors[location].blue);
> > + colors->red, colors->green, colors->blue);
> >
> > }
> >
> > static ssize_t zone_store(struct device *dev, struct device_attribute *attr,
> > const char *buf, size_t count, u8 location)
> > {
> > + struct alienfx_priv *priv = dev_get_drvdata(dev);
> > + struct color_platform *colors = &priv->colors[location];
> > int ret;
> >
> > - ret = parse_rgb(buf, &colors[location]);
> > + ret = parse_rgb(buf, colors);
> > if (ret)
> > return ret;
> >
> > - ret = alienware_update_led(location);
> > + ret = alienware_update_led(priv, location);
> >
> > return ret ? ret : count;
> > }
> > @@ -569,9 +579,11 @@ static ssize_t lighting_control_state_show(struct device *dev,
> > struct device_attribute *attr,
> > char *buf)
> > {
> > - if (lighting_control_state == LEGACY_BOOTING)
> > + struct alienfx_priv *priv = dev_get_drvdata(dev);
> > +
> > + if (priv->lighting_control_state == LEGACY_BOOTING)
> > return sysfs_emit(buf, "[booting] running suspend\n");
> > - else if (lighting_control_state == LEGACY_SUSPEND)
> > + else if (priv->lighting_control_state == LEGACY_SUSPEND)
> > return sysfs_emit(buf, "booting running [suspend]\n");
> >
> > return sysfs_emit(buf, "booting [running] suspend\n");
> > @@ -581,6 +593,7 @@ static ssize_t lighting_control_state_store(struct device *dev,
> > struct device_attribute *attr,
> > const char *buf, size_t count)
> > {
> > + struct alienfx_priv *priv = dev_get_drvdata(dev);
> > u8 val;
> >
> > if (strcmp(buf, "booting\n") == 0)
> > @@ -592,9 +605,9 @@ static ssize_t lighting_control_state_store(struct device *dev,
> > else
> > val = WMAX_RUNNING;
> >
> > - lighting_control_state = val;
> > + priv->lighting_control_state = val;
> > pr_debug("alienware-wmi: updated control state to %d\n",
> > - lighting_control_state);
> > + priv->lighting_control_state);
> >
> > return count;
> > }
> > @@ -651,43 +664,26 @@ static int wmax_brightness(int brightness)
> > 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);
> > int ret;
> > - global_brightness = brightness;
> > +
> > + priv->global_brightness = brightness;
> > +
> > if (interface == WMAX)
> > ret = wmax_brightness(brightness);
> > else
> > - ret = alienware_update_led(0);
> > + ret = alienware_update_led(priv, 0);
> > if (ret)
> > pr_err("LED brightness update failed\n");
> > }
> >
> > static enum led_brightness global_led_get(struct led_classdev *led_cdev)
> > {
> > - return global_brightness;
> > -}
> > -
> > -static struct led_classdev global_led = {
> > - .brightness_set = global_led_set,
> > - .brightness_get = global_led_get,
> > - .name = "alienware::global_brightness",
> > -};
> > + struct alienfx_priv *priv = container_of(led_cdev, struct alienfx_priv,
> > + global_led);
> >
> > -static int alienware_zone_init(struct platform_device *dev)
> > -{
> > - if (interface == WMAX) {
> > - lighting_control_state = WMAX_RUNNING;
> > - } else if (interface == LEGACY) {
> > - lighting_control_state = LEGACY_RUNNING;
> > - }
> > - global_led.max_brightness = 0x0F;
> > - global_brightness = global_led.max_brightness;
> > -
> > - return led_classdev_register(&dev->dev, &global_led);
> > -}
> > -
> > -static void alienware_zone_exit(struct platform_device *dev)
> > -{
> > - led_classdev_unregister(&global_led);
> > + return priv->global_brightness;
> > }
> >
> > static acpi_status alienware_wmax_command(void *in_args, size_t in_size,
> > @@ -792,7 +788,9 @@ static DEVICE_ATTR_RW(source);
> >
> > static bool hdmi_group_visible(struct kobject *kobj)
> > {
> > - return quirks->hdmi_mux;
> > + struct alienfx_priv *priv = dev_get_drvdata(kobj_to_dev(kobj));
> > +
> > + return priv->quirks->hdmi_mux;
> > }
> > DEFINE_SIMPLE_SYSFS_GROUP_VISIBLE(hdmi);
> >
> > @@ -838,7 +836,9 @@ static DEVICE_ATTR_RO(status);
> >
> > static bool amplifier_group_visible(struct kobject *kobj)
> > {
> > - return quirks->amplifier;
> > + struct alienfx_priv *priv = dev_get_drvdata(kobj_to_dev(kobj));
> > +
> > + return priv->quirks->amplifier;
> > }
> > DEFINE_SIMPLE_SYSFS_GROUP_VISIBLE(amplifier);
> >
> > @@ -906,7 +906,9 @@ static DEVICE_ATTR_RW(deepsleep);
> >
> > static bool deepsleep_group_visible(struct kobject *kobj)
> > {
> > - return quirks->deepslp;
> > + struct alienfx_priv *priv = dev_get_drvdata(kobj_to_dev(kobj));
> > +
> > + return priv->quirks->deepslp;
> > }
> > DEFINE_SIMPLE_SYSFS_GROUP_VISIBLE(deepsleep);
> >
> > @@ -1133,6 +1135,33 @@ static void remove_thermal_profile(void)
> > /*
> > * Platform Driver
> > */
> > +static int alienfx_probe(struct platform_device *pdev)
> > +{
> > + struct alienfx_priv *priv;
> > +
> > + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> > + if (!priv)
> > + return -ENOMEM;
> > +
> > + platform_set_drvdata(pdev, priv);
> > + priv->pdev = pdev;
> > + priv->quirks = quirks;
> > +
> > + if (interface == WMAX)
> > + priv->lighting_control_state = WMAX_RUNNING;
> > + else if (interface == LEGACY)
> > + priv->lighting_control_state = LEGACY_RUNNING;
> > +
> > + priv->global_led.name = "alienware::global_brightness";
> > + priv->global_led.brightness_set = global_led_set;
> > + priv->global_led.brightness_get = global_led_get;
> > + priv->global_led.max_brightness = 0x0F;
> > +
> > + priv->global_brightness = priv->global_led.max_brightness;
> > +
> > + return devm_led_classdev_register(&pdev->dev, &priv->global_led);
> > +}
> > +
> > static const struct attribute_group *alienfx_groups[] = {
> > &zone_attribute_group,
> > &hdmi_attribute_group,
> > @@ -1145,7 +1174,9 @@ static struct platform_driver platform_driver = {
> > .driver = {
> > .name = "alienware-wmi",
> > .dev_groups = alienfx_groups,
> > + .probe_type = PROBE_FORCE_SYNCHRONOUS,
>
> Can you please explain to me why this is exactly necessary?
Because I want to add wmax_alienfx_groups after the platform_device has
finished probing. I think it's not exactly "necessary" because those
methods only access `platdata` which is set before probing, but to me it
doesn't feel right to race with alienfx_probe().
I wanted to somehow mimic platform_create_bundle(), which I can't use
because that function needs to be called from an __init section.
If this is unnecessary I will drop it, otherwise I think it makes more
sense to move this to [8/20].
>
> Thanks,
> Armin Wolf
>
> > },
> > + .probe = alienfx_probe,
> > };
> >
> > static int __init alienware_wmi_init(void)
> > @@ -1193,15 +1224,8 @@ static int __init alienware_wmi_init(void)
> > goto fail_prep_thermal_profile;
> > }
> >
> > - ret = alienware_zone_init(platform_device);
> > - if (ret)
> > - goto fail_prep_zones;
> > -
> > return 0;
> >
> > -fail_prep_zones:
> > - alienware_zone_exit(platform_device);
> > - remove_thermal_profile();
> > fail_prep_thermal_profile:
> > platform_device_del(platform_device);
> > fail_platform_device2:
> > @@ -1216,7 +1240,6 @@ module_init(alienware_wmi_init);
> >
> > static void __exit alienware_wmi_exit(void)
> > {
> > - alienware_zone_exit(platform_device);
> > remove_thermal_profile();
> > platform_device_unregister(platform_device);
> > platform_driver_unregister(&platform_driver);
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