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Subject: Re: [PATCH] platform/x86: asus-wmi: Add support for SW_TABLET_MODE on
 UX360
To:     =?UTF-8?Q?Samuel_=c4=8cavoj?= <samuel@cavoj.net>,
        Darren Hart <dvhart@infradead.org>,
        Andy Shevchenko <andy@infradead.org>,
        Corentin Chary <corentin.chary@gmail.com>
Cc:     platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20200916191232.1020318-1-samuel@cavoj.net>
From:   Hans de Goede <hdegoede@redhat.com>
Message-ID: <206d51c4-401d-e73b-b81a-fc57346a47ee@redhat.com>
Date:   Thu, 17 Sep 2020 14:23:12 +0200
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Hi,

On 9/16/20 9:12 PM, Samuel Čavoj wrote:
> The UX360CA has a WMI device id 0x00060062, which reports whether the
> lid is flipped in tablet mode (1) or in normal laptop mode (0).
> 
> This commit adds a quirk (quirk_asus_use_lid_flip_devid) for devices on
> which this WMI device should be used to figure out the SW_TABLET_MODE
> state, as opposed to the quirk_asus_use_kbd_dock_devid.
> 
> It is assumed other UX360* models have the same WMI device. As such, the
> quirk is applied to devices with DMI_MATCH(DMI_PRODUCT_NAME, "UX360").
> More devices with this feature need to be tested and added accordingly.
> 
> The reason for using a whitelist via the quirk mechanism is that the new
> WMI device (0x00060062) is also present on some models which do not have
> a 360 degree hinge (at least FX503VD and GL503VD from Hans' DSTS
> collection) and therefore its presence cannot be relied on.
> 
> This patch is a followup to "platform/x86: asus-wmi: Fix SW_TABLET_MODE
> always reporting 1 on many different models" by Hans de Goede.
> 
> Signed-off-by: Samuel Čavoj <samuel@cavoj.net>
> Cc: Hans de Goede <hdegoede@redhat.com>
> ---
>   drivers/platform/x86/asus-nb-wmi.c         | 14 +++++++++++++
>   drivers/platform/x86/asus-wmi.c            | 23 ++++++++++++++++++++++
>   drivers/platform/x86/asus-wmi.h            |  1 +
>   include/linux/platform_data/x86/asus-wmi.h |  1 +
>   4 files changed, 39 insertions(+)
> 
> diff --git a/drivers/platform/x86/asus-nb-wmi.c b/drivers/platform/x86/asus-nb-wmi.c
> index 345bd224494b..ae5501e07712 100644
> --- a/drivers/platform/x86/asus-nb-wmi.c
> +++ b/drivers/platform/x86/asus-nb-wmi.c
> @@ -119,6 +119,10 @@ static struct quirk_entry quirk_asus_use_kbd_dock_devid = {
>   	.use_kbd_dock_devid = true,
>   };
>   
> +static struct quirk_entry quirk_asus_use_lid_flip_devid = {
> +	.use_lid_flip_devid = true,


Note the default (quirk_asus_unknown) quirks set:

         .wmi_backlight_set_devstate = true,

So you're changing that to false for all devices using that
quirk now.  I did not set this quirk for the transformer devices,
since the quirk has to do with the handling of Fn + F7 (display off hotkey)
by the embedded-controller. Since on transformer devices the keyboard is
an USB device and not handled by the embedded-controller they do not need
the wmi_backlight_set_devstate quirk, so I left it out. Chances are that
your UX360 does need it. The purpose of the quirk is to make the embbedded
controller send a KEY_DISPLAY_OFF event on FN + F7 and have it not do anything
else (like turning off the backlight by itself).

TL;DR: you should probably add:         .wmi_backlight_set_devstate = true,
to your new quirk_asus_use_lid_flip_devid quirk.


> +};
> +
>   static int dmi_matched(const struct dmi_system_id *dmi)
>   {
>   	pr_info("Identified laptop model '%s'\n", dmi->ident);
> @@ -520,6 +524,16 @@ static const struct dmi_system_id asus_quirks[] = {
>   		},
>   		.driver_data = &quirk_asus_use_kbd_dock_devid,
>   	},
> +	{
> +		.callback = dmi_matched,
> +		.ident = "ASUS ZenBook Flip UX360",
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
> +			/* Match UX360* */
> +			DMI_MATCH(DMI_PRODUCT_NAME, "UX360"),
> +		},
> +		.driver_data = &quirk_asus_use_lid_flip_devid,
> +	},
>   	{},
>   };
>   
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index ae6289d37faf..a628a7d9e066 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -63,6 +63,7 @@ MODULE_LICENSE("GPL");
>   #define NOTIFY_KBD_BRTTOGGLE		0xc7
>   #define NOTIFY_KBD_FBM			0x99
>   #define NOTIFY_KBD_TTP			0xae
> +#define NOTIFY_LID_FLIP			0xfa
>   
>   #define ASUS_WMI_FNLOCK_BIOS_DISABLED	BIT(0)
>   
> @@ -375,6 +376,18 @@ static int asus_wmi_input_init(struct asus_wmi *asus)
>   		}
>   	}
>   
> +	if (asus->driver->quirks->use_lid_flip_devid) {
> +		result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_LID_FLIP);
> +		if (result >= 0) {
> +			input_set_capability(asus->inputdev, EV_SW, SW_TABLET_MODE);
> +			input_report_switch(asus->inputdev, SW_TABLET_MODE, result);
> +		} else if (result == -ENODEV) {
> +			pr_err("This device has lid_flip quirk but got ENODEV checking it. This is a bug.");
> +		} else {
> +			pr_err("Error checking for lid-flip: %d\n", result);
> +		}
> +	}
> +
>   	err = input_register_device(asus->inputdev);
>   	if (err)
>   		goto err_free_dev;
> @@ -2127,6 +2140,16 @@ static void asus_wmi_handle_event_code(int code, struct asus_wmi *asus)
>   		return;
>   	}
>   
> +	if (asus->driver->quirks->use_lid_flip_devid && code == NOTIFY_LID_FLIP) {
> +		result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_LID_FLIP);
> +
> +		if (result >= 0) {
> +			input_report_switch(asus->inputdev, SW_TABLET_MODE, result);
> +			input_sync(asus->inputdev);
> +		}
> +		return;
> +	}
> +
>   	if (asus->fan_boost_mode_available && code == NOTIFY_KBD_FBM) {
>   		fan_boost_mode_switch_next(asus);
>   		return;
> diff --git a/drivers/platform/x86/asus-wmi.h b/drivers/platform/x86/asus-wmi.h
> index 1a95c172f94b..b302415bf1d9 100644
> --- a/drivers/platform/x86/asus-wmi.h
> +++ b/drivers/platform/x86/asus-wmi.h
> @@ -34,6 +34,7 @@ struct quirk_entry {
>   	bool wmi_backlight_set_devstate;
>   	bool wmi_force_als_set;
>   	bool use_kbd_dock_devid;
> +	bool use_lid_flip_devid;
>   	int wapf;
>   	/*
>   	 * For machines with AMD graphic chips, it will send out WMI event
> diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
> index 897b8332a39f..2f274cf52805 100644
> --- a/include/linux/platform_data/x86/asus-wmi.h
> +++ b/include/linux/platform_data/x86/asus-wmi.h
> @@ -62,6 +62,7 @@
>   
>   /* Misc */
>   #define ASUS_WMI_DEVID_CAMERA		0x00060013
> +#define ASUS_WMI_DEVID_LID_FLIP		0x00060062
>   
>   /* Storage */
>   #define ASUS_WMI_DEVID_CARDREADER	0x00080013
> 

Otherwise the patch looks good to me, thank you for the patch.

Regards,

Hans