linux-kernel - Re: [REGRESSION] Right touchpad button disabled on Dell 7750

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Date:   Fri, 18 Mar 2022 17:05:18 +0100
From:   José Expósito <jose.exposito89@...il.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org,
        Peter Hutterer <peter.hutterer@...-t.net>,
        Jiri Kosina <jkosina@...e.cz>, stable@...r.kernel.org,
        regressions@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] Right touchpad button disabled on Dell 7750

On Fri, Mar 18, 2022 at 03:37:20PM +0100, Takashi Iwai wrote:
> So is it like below?  I'll build another kernel with that.
> 
> 
> Thanks!
> 
> Takashi
> 
> -- 8< --
> From: José Expósito <jose.exposito89@...il.com>
> Subject: [PATCH] HID: multitouch: fix Dell Precision 7550 and 7750 button type
> 
> The touchpad present in the Dell Precision 7550 and 7750 laptops
> reports a HID_DG_BUTTONTYPE of type MT_BUTTONTYPE_CLICKPAD. However,
> the device is not a clickpad, it is a touchpad with physical buttons.
> 
> In order to fix this issue, a quirk for the device was introduced in
> libinput [1] [2] to disable the INPUT_PROP_BUTTONPAD property:
> 
> 	[Precision 7x50 Touchpad]
> 	MatchBus=i2c
> 	MatchUdevType=touchpad
> 	MatchDMIModalias=dmi:*svnDellInc.:pnPrecision7?50*
> 	AttrInputPropDisable=INPUT_PROP_BUTTONPAD
> 
> However, because of the change introduced in 37ef4c19b4 ("Input: clear
> BTN_RIGHT/MIDDLE on buttonpads") the BTN_RIGHT key bit is not mapped
> anymore breaking the device right click button.
> 
> In order to fix the issue, create a quirk for the device forcing its
> button type to touchpad regardless of the value reported by the
> firmware.
> 
> [1] https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/481
> [2] https://bugzilla.redhat.com/show_bug.cgi?id=1868789
> 
> [ modified MT_CLS_BUTTONTYPE_TOUCHPAD quirk bits to base on MT_CLS_WIN8
>   as suggested by Benjamin -- tiwai ]
> 
> Fixes: 37ef4c19b4 ("Input: clear BTN_RIGHT/MIDDLE on buttonpads")
> Signed-off-by: José Expósito <jose.exposito89@...il.com>
> Signed-off-by: Takashi Iwai <tiwai@...e.de>
> 
> ---
>  drivers/hid/hid-ids.h        |    3 +++
>  drivers/hid/hid-multitouch.c |   20 ++++++++++++++++++++
>  2 files changed, 23 insertions(+)
> 
> --- a/drivers/hid/hid-ids.h
> +++ b/drivers/hid/hid-ids.h
> @@ -285,6 +285,9 @@
>  
>  #define USB_VENDOR_ID_CIDC		0x1677
>  
> +#define USB_VENDOR_ID_CIRQUE_CORP		0x0488
> +#define USB_DEVICE_ID_DELL_PRECISION_7X50	0x120A
> +
>  #define USB_VENDOR_ID_CJTOUCH		0x24b8
>  #define USB_DEVICE_ID_CJTOUCH_MULTI_TOUCH_0020	0x0020
>  #define USB_DEVICE_ID_CJTOUCH_MULTI_TOUCH_0040	0x0040
> --- a/drivers/hid/hid-multitouch.c
> +++ b/drivers/hid/hid-multitouch.c
> @@ -71,6 +71,7 @@ MODULE_LICENSE("GPL");
>  #define MT_QUIRK_SEPARATE_APP_REPORT	BIT(19)
>  #define MT_QUIRK_FORCE_MULTI_INPUT	BIT(20)
>  #define MT_QUIRK_DISABLE_WAKEUP		BIT(21)
> +#define MT_QUIRK_BUTTONTYPE_TOUCHPAD	BIT(22)
>  
>  #define MT_INPUTMODE_TOUCHSCREEN	0x02
>  #define MT_INPUTMODE_TOUCHPAD		0x03
> @@ -194,6 +195,7 @@ static void mt_post_parse(struct mt_devi
>  #define MT_CLS_WIN_8_FORCE_MULTI_INPUT		0x0015
>  #define MT_CLS_WIN_8_DISABLE_WAKEUP		0x0016
>  #define MT_CLS_WIN_8_NO_STICKY_FINGERS		0x0017
> +#define MT_CLS_BUTTONTYPE_TOUCHPAD		0x0018
>  
>  /* vendor specific classes */
>  #define MT_CLS_3M				0x0101
> @@ -302,6 +304,15 @@ static const struct mt_class mt_classes[
>  			MT_QUIRK_CONTACT_CNT_ACCURATE |
>  			MT_QUIRK_WIN8_PTP_BUTTONS,
>  		.export_all_inputs = true },
> +	{ .name = MT_CLS_BUTTONTYPE_TOUCHPAD,
> +		.quirks = MT_QUIRK_ALWAYS_VALID |
> +			MT_QUIRK_IGNORE_DUPLICATES |
> +			MT_QUIRK_HOVERING |
> +			MT_QUIRK_CONTACT_CNT_ACCURATE |
> +			MT_QUIRK_STICKY_FINGERS |
> +			MT_QUIRK_WIN8_PTP_BUTTONS |,
> +			MT_QUIRK_BUTTONTYPE_TOUCHPAD,
> +		.export_all_inputs = true },
>  
>  	/*
>  	 * vendor specific classes
> @@ -1286,6 +1297,9 @@ static int mt_touch_input_configured(str
>  	    (app->buttons_count == 1))
>  		td->is_buttonpad = true;
>  
> +	if (app->quirks & MT_QUIRK_BUTTONTYPE_TOUCHPAD)
> +		td->is_buttonpad = false;
> +
>  	if (td->is_buttonpad)
>  		__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
>  
> @@ -1875,6 +1889,12 @@ static const struct hid_device_id mt_dev
>  		MT_USB_DEVICE(USB_VENDOR_ID_CHUNGHWAT,
>  			USB_DEVICE_ID_CHUNGHWAT_MULTITOUCH) },
>  
> +	/* Cirque Corp (Dell Precision 7550 and 7750 touchpad) */
> +	{ .driver_data = MT_CLS_BUTTONTYPE_TOUCHPAD,
> +		HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,
> +			USB_VENDOR_ID_CIRQUE_CORP,
> +			USB_DEVICE_ID_DELL_PRECISION_7X50) },
> +
>  	/* CJTouch panels */
>  	{ .driver_data = MT_CLS_NSMU,
>  		MT_USB_DEVICE(USB_VENDOR_ID_CJTOUCH,


Yes, that is the correct patch. The original reporter just emailed me
and confirmed that the patch works and that the class used by the
device is MT_CLS_WIN_8, as Benjamin pointed out.

I'll wait a couple of days before sending the patch to the mailing list
so the other users can test it as well.

Thanks for the quick response,
Jose