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Message-Id: <D7RD26POOF0C.1P0CGJQ7YSQJT@gmail.com>
Date: Thu, 13 Feb 2025 08:43:43 -0500
From: "Kurt Borja" <kuurtb@...il.com>
To: "Jackie Dong" <xy-jackie@....com>, <hdegoede@...hat.com>,
<ilpo.jarvinen@...ux.intel.com>
Cc: <linux-kernel@...r.kernel.org>, <platform-driver-x86@...r.kernel.org>,
<dongeg1@...ovo.com>, "Mark Pearson" <mpearson-lenovo@...ebb.ca>
Subject: Re: [PATCH v5] platform/x86: lenovo-super-hotkey-wmi.c: Support
formic and audio mute LEDs
On Thu Feb 13, 2025 at 4:32 AM -05, Jackie Dong wrote:
> Hi Kurt,
> Thanks for your careful review and new comments which are helpful
> for me to understand maintainers ideas, pls review my comments as below.
> I'll submit a new revison of the patch after get your feedback.
> On 2/13/25 01:43, Kurt Borja wrote:
>> Hi Jackie,
>>
>> I left some style recommendations below and a couple questions. I
>> apologize for not including this in the last review.
>>
>> On Wed Feb 12, 2025 at 2:01 AM -05, Jackie Dong wrote:
>>> Implement Lenovo utility data WMI calls needed to make LEDs
>>> work on Ideapads that support this GUID.
>>> This enables the mic and audio LEDs to be updated correctly.
>>>
>>> Tested on below samples.
>>> ThinkBook 13X Gen4 IMH
>>> ThinkBook 14 G6 ABP
>>> ThinkBook 16p Gen4-21J8
>>> ThinkBook 16 G8 IRL
>>> ThinkBook 16 G7+ ASP
>>>
>>> Signed-off-by: Jackie Dong <xy-jackie@....com>
>>> Suggested-by: Mark Pearson <mpearson-lenovo@...ebb.ca>
>>> ---
>>> Changes in v5:
>>> - Take out union acpi_object *obj __free(kfree) = output.pointer from
>>> if-else block
>>> - Remove lsk_wmi_context_lud_keys related source code
>>>
>>> Changes in v4:
>>> - Add related head files include cleanup.h, dev_printk.h, device.h,
>>> module.h
>>> - Replaced kfree() by __free()
>>> - Remove double free for obj
>>> - Remove wpriv->cdev[led_type].dev = dev
>>> - Remove *wpriv = *(const struct lenovo_super_hotkey_wmi_private *)context
>>> - Remove wpriv->event == LSH_WMI_EVENT_LUD_KEYS
>>> - Remove lenovo_super_hotkey_wmi_remove() for unnecessary
>>>
>>> Changes in v3:
>>> - Changed the name of the Kconfig entry to LENOVO_SUPER_HOTKEY_WMI
>>> - Renamed everything in this driver which contains the name "ideapad"
>>> to instead contain the name of this driver.
>>> - Moved struct wmi_device *led_wdev in lenovo_super_hotkey_wmi_private,
>>> and use container_of() to the led_wdev pointer.
>>> - Replaced sizeof(struct wmi_led_args) by sizeof(led_arg)
>>> - Added condtions checking for obj && obj->type == ACPI_TYPE_INTEGER
>>> and free the ACPI object after get the required value.
>>> - Removed led_classdev_unregister() after led_reg_failed label, but
>>> add lenovo_super_hotkey_wmi_remove(struct wmi_device *wdev) to free
>>> resource.
>>> - Removed IDEAPAD_WMI_EVENT_FN_KEYS/IDEAPAD_WMI_EVENT_LUD_KEYS related
>>> source codes and only keep LUD_WMI_METHOD_GUID.
>>>
>>> Changes in v2:
>>> - Update code layout and formatting as recommended in review
>>> - Improved error handling in ideapad_wmi_led_init
>>> - Separated a WMI driver named lenovo-super-hotkey-wmi.c from
>>> ideapad-lap.c, it's only for Lenovo Super Hotkey WMI devices.
>>>
>>> drivers/platform/x86/Kconfig | 9 +
>>> drivers/platform/x86/Makefile | 1 +
>>> .../platform/x86/lenovo-super-hotkey-wmi.c | 222 ++++++++++++++++++
>>> 3 files changed, 232 insertions(+)
>>> create mode 100644 drivers/platform/x86/lenovo-super-hotkey-wmi.c
>>>
>>> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
>>> index 0258dd879d64..c1792e8f04e1 100644
>>> --- a/drivers/platform/x86/Kconfig
>>> +++ b/drivers/platform/x86/Kconfig
>>> @@ -475,6 +475,15 @@ config IDEAPAD_LAPTOP
>>> This is a driver for Lenovo IdeaPad netbooks contains drivers for
>>> rfkill switch, hotkey, fan control and backlight control.
>>>
>>> +config LENOVO_SUPER_HOTKEY_WMI
>>> + tristate "Lenovo Super Hotkey Utility WMI extras driver"
>>> + depends on ACPI_WMI
>>> + depends on IDEAPAD_LAPTOP
>>
>> Does this still depend on IDEAPAD_LAPTOP? Also add:
>> select NEW_LEDS
>> select LEDS_CLASS
>>
> In my view, keep depend on IDEAPAD, because that mic-mute LED function
> doesn't work without ideapad_laptop.ko. Due to KEY_MICMUTE event is
> handled in ideapad_laptop. And this file only turn on/off MIC mute LED
> after the KEY_MICMUTE pressed. For Audio mute LED, audio mute key is
> common handled by keyboard driver, but MIC mute key is special and
> handled in ideapad_laptop.ko for Lenovo non-ThinkPad products. Audio
> mute and MIC mute function can work when user press related hotkey in
> past, only it's mute LED doesn't turn on/off.
> For ThinkPad products, MIC mute key is handled in thinkpad_acpi.
Oh - Thanks, this is important information.
>
> { KE_KEY, 0x3e | IDEAPAD_WMI_KEY, { KEY_MICMUTE } }, in
> ideapad_keymap[].
>
> This LENOVO_SUPER_HOTKEY_WMI depends on IDEAPAD_LAPTOP which included
> led moudles(NEW_LEDS/LEDS_CLASS) as below. Maybe it shoud be enough.
I'd add them anyway, to be explicit about what this module needs.
>
> config IDEAPAD_LAPTOP
> tristate "Lenovo IdeaPad Laptop Extras"
> depends on ACPI
> depends on RFKILL && INPUT
> depends on SERIO_I8042
> depends on BACKLIGHT_CLASS_DEVICE
> depends on ACPI_VIDEO || ACPI_VIDEO = n
> depends on ACPI_WMI || ACPI_WMI = n
> select ACPI_PLATFORM_PROFILE
> select INPUT_SPARSEKMAP
> select NEW_LEDS
> select LEDS_CLASS
> help
> This is a driver for Lenovo IdeaPad netbooks contains drivers for
> rfkill switch, hotkey, fan control and backlight control.
>
>>> + help
>>> + This driver provides WMI support for Lenovo customized hotkeys function
>>> + of Lenovo NoteBooks which are for Consumer and SMB customers, such as
>>> + Ideapad/YOGA/XiaoXin/Gaming/ThinkBook and so on.
>>
>> This driver deals with mute key leds. Is this description right?
> In fact, this driver should handle all lenovo super hotkey functions
> which are implemeteled by wmi. Audio mute LED and Mic mute LED are just
> the two functions of them. The driver will be extented for all lenovo
> super hotkey in future. I have to say that different products are with
> different hotkey, not all products support all hotkeys function, such as
> many ThinkBook products without MIC mute LED. Currently,
Interesting.
As this driver doesn't handle the hotkeys directly, may I suggest some
slight rewording? Something like:
"This driver provides WMI support for Lenovo hotkey utilities, such as
LED control for audio/mic mute events for IdeaPad, etc..."
Remember this can be edited as new features are implemented.
>
> Some links are FYR.
> How to use Lenovo Hotkeys on keyboard?
> https://tt-hardware.com/en/pc/how-to-use-lenovo-hotkeys-on-keyboard/
> Lenovo Hotkeys
> https://apps.microsoft.com/detail/9pcmmnb260tx?hl=en-us&gl=US
>
> For these Lenovo Hotkeys, ThinkPad series are impelemented by acpi, but
> some hotkeys of non-ThinkPad products are impelemented by wmi, special
> for latest non-ThinkPad products. This is why I write this driver.
>>
>>> +
>>> config LENOVO_YMC
>>> tristate "Lenovo Yoga Tablet Mode Control"
>>> depends on ACPI_WMI
>>> diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
>>> index e1b142947067..598335da9f55 100644
>>> --- a/drivers/platform/x86/Makefile
>>> +++ b/drivers/platform/x86/Makefile
>>> @@ -61,6 +61,7 @@ obj-$(CONFIG_UV_SYSFS) += uv_sysfs.o
>>> # IBM Thinkpad and Lenovo
>>> obj-$(CONFIG_IBM_RTL) += ibm_rtl.o
>>> obj-$(CONFIG_IDEAPAD_LAPTOP) += ideapad-laptop.o
>>> +obj-$(CONFIG_LENOVO_SUPER_HOTKEY_WMI) += lenovo-super-hotkey-wmi.o
>>> obj-$(CONFIG_LENOVO_YMC) += lenovo-ymc.o
>>> obj-$(CONFIG_SENSORS_HDAPS) += hdaps.o
>>> obj-$(CONFIG_THINKPAD_ACPI) += thinkpad_acpi.o
>>> diff --git a/drivers/platform/x86/lenovo-super-hotkey-wmi.c b/drivers/platform/x86/lenovo-super-hotkey-wmi.c
>>
>> This name doesn't tell me a lot about the features of this driver. Is
>> this the internal name of the WMI device?
> Reference previous comment.
> If you have a better proposal, let me know.
I propose lenovo-wmi-hotkey-utilities.c.
Let me know what you think about the description and name proposals.
>>
>>> new file mode 100644
>>> index 000000000000..86c3dc2009b8
>>> --- /dev/null
>>> +++ b/drivers/platform/x86/lenovo-super-hotkey-wmi.c
>>> @@ -0,0 +1,222 @@
>>> +// SPDX-License-Identifier: GPL-2.0
>>> +/*
>>> + * Lenovo Super Hotkey Utility WMI extras driver for Ideapad laptop
>>> + *
>>> + * Copyright (C) 2025 Lenovo
>>> + */
>>> +
>>> +#include <linux/cleanup.h>
>>> +#include <linux/dev_printk.h>
>>> +#include <linux/device.h>
>>> +#include <linux/leds.h>
>>> +#include <linux/module.h>
>>> +#include <linux/wmi.h>
>>> +
>>> +/* Lenovo Super Hotkey WMI GUIDs */
>>> +#define LUD_WMI_METHOD_GUID "CE6C0974-0407-4F50-88BA-4FC3B6559AD8"
>>> +
>>> +/* Lenovo Utility Data WMI method_id */
>>> +#define WMI_LUD_GET_SUPPORT 1
>>> +#define WMI_LUD_SET_FEATURE 2
>>> +
>>> +#define WMI_LUD_GET_MICMUTE_LED_VER 20
>>> +#define WMI_LUD_GET_AUDIOMUTE_LED_VER 26
>>> +
>>> +#define WMI_LUD_SUPPORT_MICMUTE_LED_VER 25
>>> +#define WMI_LUD_SUPPORT_AUDIOMUTE_LED_VER 27
>>> +
>>> +/* Input parameters to mute/unmute audio LED and Mic LED */
>>> +struct wmi_led_args {
>>> + u8 id;
>>> + u8 subid;
>>> + u16 value;
>>> +};
>>> +
>>> +/* Values of input parameters to SetFeature of audio LED and Mic LED */
>>> +enum hotkey_set_feature {
>>> + MIC_MUTE_LED_ON = 1,
>>> + MIC_MUTE_LED_OFF,
>>> + AUDIO_MUTE_LED_ON = 4,
>>
>> Please align this values.
> For this comment, I understand it should be as below. If my
> understanding is insufficient,pls give me a sample to update it.
>
> +enum hotkey_set_feature {
> + MIC_MUTE_LED_ON = 1,
> + MIC_MUTE_LED_OFF,
> + AUDIO_MUTE_LED_ON = 4,
> + AUDIO_MUTE_LED_OFF,
I'd go for:
MIC_MUTE_LED_ON = 1,
MIC_MUTE_LED_ON = 2,
AUDIO_MUTE_LED_ON = 4,
AUDIO_MUTE_LED_OFF = 5,
To be more explicit.
>
>
>>
>>> + AUDIO_MUTE_LED_OFF,
>>> +};
>>> +
>>> +#define LSH_ACPI_LED_MAX 2
>>> +
>>> +struct lenovo_super_hotkey_wmi_private {
>>> + struct led_classdev cdev[LSH_ACPI_LED_MAX];
>>> + struct wmi_device *led_wdev;
>>> +};
>>> +
>>> +enum mute_led_type {
>>> + MIC_MUTE,
>>> + AUDIO_MUTE,
>>> +};
>>> +
>>> +static int lsh_wmi_mute_led_set(enum mute_led_type led_type, struct led_classdev *led_cdev,
>>> + enum led_brightness brightness)
>>> +
>>> +{
>>> + struct lenovo_super_hotkey_wmi_private *wpriv = container_of(led_cdev,
>>> + struct lenovo_super_hotkey_wmi_private, cdev[led_type]);
>>> + struct wmi_led_args led_arg = {0, 0, 0};
>>> + struct acpi_buffer input;
>>> + acpi_status status;
>>> +
>>> + switch (led_type) {
>>> + case MIC_MUTE:
>>> + led_arg.id = brightness == LED_ON ? MIC_MUTE_LED_ON : MIC_MUTE_LED_OFF;
>>> + break;
>>> + case AUDIO_MUTE:
>>> + led_arg.id = brightness == LED_ON ? AUDIO_MUTE_LED_ON : AUDIO_MUTE_LED_OFF;
>>> + break;
>>> + default:
>>> + return -EINVAL;
>>> + }
>>> +
>>> + input.length = sizeof(led_arg);
>>> + input.pointer = &led_arg;
>>> + status = wmidev_evaluate_method(wpriv->led_wdev, 0, WMI_LUD_SET_FEATURE, &input, NULL);
>>> + if (ACPI_FAILURE(status))
>>> + return -EIO;
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int lsh_wmi_audiomute_led_set(struct led_classdev *led_cdev,
>>> + enum led_brightness brightness)
>>> +
>>> +{
>>> + return lsh_wmi_mute_led_set(AUDIO_MUTE, led_cdev, brightness);
>>> +}
>>> +
>>> +static int lsh_wmi_micmute_led_set(struct led_classdev *led_cdev,
>>> + enum led_brightness brightness)
>>> +{
>>> + return lsh_wmi_mute_led_set(MIC_MUTE, led_cdev, brightness);
>>> +}
>>> +
>>> +static int lenovo_super_hotkey_wmi_led_init(enum mute_led_type led_type, struct device *dev)
>>> +{
>>> + struct lenovo_super_hotkey_wmi_private *wpriv = dev_get_drvdata(dev);
>>> + struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
>>> + struct acpi_buffer input;
>>> + int led_version, err = 0;
>>> + unsigned int wmiarg;
>>> + acpi_status status;
>>> +
>>> + switch (led_type) {
>>> + case MIC_MUTE:
>>> + wmiarg = WMI_LUD_GET_MICMUTE_LED_VER;
>>> + break;
>>> + case AUDIO_MUTE:
>>> + wmiarg = WMI_LUD_GET_AUDIOMUTE_LED_VER;
>>> + break;
>>> + default:
>>> + return -EINVAL;
>>> + }
>>> +
>>> + input.length = sizeof(wmiarg);
>>> + input.pointer = &wmiarg;
>>> + status = wmidev_evaluate_method(wpriv->led_wdev, 0, WMI_LUD_GET_SUPPORT, &input, &output);
>>> + if (ACPI_FAILURE(status))
>>> + return -EIO;
>>> +
>>> + union acpi_object *obj __free(kfree) = output.pointer;
>>> + if (obj && obj->type == ACPI_TYPE_INTEGER) {
>>> + led_version = obj->integer.value;
>>> + } else {
>>> + err = -EIO;
>>> + return err;
>>
>> Return -EIO directly here and drop the braces on both branches.
>>
> OK, will update it next revision.
>>> + }
>>> +
>>> + wpriv->cdev[led_type].max_brightness = LED_ON;
>>> + wpriv->cdev[led_type].flags = LED_CORE_SUSPENDRESUME;
>>> +
>>> + switch (led_type) {
>>> + case MIC_MUTE:
>>> + if (led_version != WMI_LUD_SUPPORT_MICMUTE_LED_VER) {
>>> + err = -EIO;
>>> + goto led_error;
>>
>> Return -EIO and drop brances.
>>
> OK, will update it next revision.
>>> + }
>>> + wpriv->cdev[led_type].name = "platform::micmute";
>>> + wpriv->cdev[led_type].brightness_set_blocking = &lsh_wmi_micmute_led_set;
>>> + wpriv->cdev[led_type].default_trigger = "audio-micmute";
>>> +
>>> + err = devm_led_classdev_register(dev, &wpriv->cdev[led_type]);
>>> + if (err < 0)
>>> + goto led_reg_failed;
>>> +
>>> + break;
>>> + case AUDIO_MUTE:
>>> + if (led_version != WMI_LUD_SUPPORT_AUDIOMUTE_LED_VER) {
>>> + err = -EIO;
>>> + goto led_error;
>>
>> Return -EIO and drop brances.
>>
> OK, will update it next revision.
>>> + }
>>> + wpriv->cdev[led_type].name = "platform::mute";
>>> + wpriv->cdev[led_type].brightness_set_blocking = &lsh_wmi_audiomute_led_set;
>>> + wpriv->cdev[led_type].default_trigger = "audio-mute";
>>> +
>>> + err = devm_led_classdev_register(dev, &wpriv->cdev[led_type]);
>>> + if (err < 0)
>>> + goto led_reg_failed;
>>> +
>>> + break;
>>> + default:
>>> + err = -EINVAL;
>>> + dev_err(dev, "Unknown LED type %d\n", led_type);
>>> + goto led_error;
>>
>> Return -EINVAL directly.
>>
> OK, will update it next revision.
>>> + }
>>> +
>>> + return 0;
>>> +
>>> +led_reg_failed:
>>> + dev_err(dev, "Could not register mute LED %d : %d\n", led_type, err);
>>> +
>>> +led_error:
>>> + return err;
>>> +}
>>> +
>>> +static void lenovo_super_hotkey_wmi_leds_setup(struct device *dev)
>>> +{
>>> + lenovo_super_hotkey_wmi_led_init(MIC_MUTE, dev);
>>> + lenovo_super_hotkey_wmi_led_init(AUDIO_MUTE, dev);
>>
>> I wonder why you decided not to propagate errors of this calls. Maybe
>> you are expecting one to fail but not the other?
>>
>> If this both fail this module would remain loaded for no reason, so
>> maybe propagate some error in that case.
>>
> Oh, it's my fault. I'll update related source code as below.
>
> static int lenovo_super_hotkey_wmi_leds_setup(struct device *dev)
> {
> int err;
> err = lenovo_super_hotkey_wmi_led_init(MIC_MUTE, dev);
> if (err)
> return err;
>
> err = lenovo_super_hotkey_wmi_led_init(AUDIO_MUTE, dev);
> if (err)
> return err;
>
> return 0;
> }
>
>>> +}
>>> +
>>> +static int lenovo_super_hotkey_wmi_probe(struct wmi_device *wdev, const void *context)
>>> +{
>>> + struct lenovo_super_hotkey_wmi_private *wpriv;
>>> +
>>> + wpriv = devm_kzalloc(&wdev->dev, sizeof(*wpriv), GFP_KERNEL);
>>> + if (!wpriv)
>>> + return -ENOMEM;
>>> +
>>> + dev_set_drvdata(&wdev->dev, wpriv);
>>> + wpriv->led_wdev = wdev;
>>> + lenovo_super_hotkey_wmi_leds_setup(&wdev->dev);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static const struct wmi_device_id lenovo_super_hotkey_wmi_id_table[] = {
>>> + { LUD_WMI_METHOD_GUID, NULL }, /* Utility data */
>>
>> Maybe drop this comment.
>>
> From Lenovo Keyboard WMI Specification V3.6, there're 3 WMI GUIDs at
> least now. I hope to keep the comment which should be helpful for new
> developer of this driver.
Then it's fine IMO.
--
~ Kurt
>
> [WMI,
> Dynamic,
> Provider("WmiProv"),
> Locale("MS\\0x409"),
> Description("Lenovo Utility Key Press Event"),
> guid("{8fc0de0c-b4e4-43fd-b0f3-8871711c1294}")
> ]
> class LENOVO_UTILITY_EVENT: WMIEvent
> ...
> [WMI,
> Dynamic,
> Provider("WmiProv"),
> Locale("MS\\0x409"),
> Description("LENOVO_UTILITY_DATA class"),
> guid("{ce6c0974-0407-4f50-88ba-4fc3b6559ad8}")
> ]
> class LENOVO_UTILITY_DATA
> ...
> LENOVO_INTERNAL_PANEL_REFRESH_RATE_DATA can
> get panel refresh rate)
> Namespace:L"root\\wmi"
> Class LENOVO_INTERNAL_PANEL_REFRESH_RATE_DATA
> GUID guid("{6260ecad-0d7d-4201-a8bd-2552e812501f}"
>
>> Additionally, please CC me and previous reviewers the next revision.
>>
> OK, will do next revision.
>> --
>> ~ Kurt
>>
>>> + { }
>>> +};
>>> +
>>> +MODULE_DEVICE_TABLE(wmi, lenovo_super_hotkey_wmi_id_table);
>>> +
>>> +static struct wmi_driver lenovo_super_hotkey_wmi_driver = {
>>> + .driver = {
>>> + .name = "lenovo_super_hotkey_wmi",
>>> + .probe_type = PROBE_PREFER_ASYNCHRONOUS
>>> + },
>>> + .id_table = lenovo_super_hotkey_wmi_id_table,
>>> + .probe = lenovo_super_hotkey_wmi_probe,
>>> + .no_singleton = true,
>>> +};
>>> +
>>> +module_wmi_driver(lenovo_super_hotkey_wmi_driver);
>>> +
>>> +MODULE_INFO(depends, "wmi,ideapad-laptop"); MODULE_AUTHOR("Jackie
>>> +Dong <dongeg1@...ovo.com>"); MODULE_DESCRIPTION("Lenovo Super Hotkey
>>> +Utility WMI extras driver"); MODULE_LICENSE("GPL");
>>
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