linux-kernel - Re: [PATCH] HID: add support for PenMount dual-touch panel

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Date:	Wed, 20 Apr 2011 11:47:00 +0200
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	PenMount <penmount.touch@...il.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Benjamin Tissoires <benjamin.tissoires@...c.fr>,
	Jiri Kosina <jkosina@...e.cz>,
	Stephane Chatty <chatty@...-enac.fr>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	PenMount <salt@...t.com.tw>
Subject: Re: [PATCH] HID: add support for PenMount dual-touch panel

Hi,

thanks for the patch. Please find comments inline.

On Wed, Apr 20, 2011 at 05:19:15PM +0800, PenMount wrote:
> This patch adds PenMount support to hid-multitouch.
> A new class MT_CLS_CONFIDENCE_SERIAL_MODE is defined for PenMount,
> since it uses HID_DG_CONFIDENCE as the valid flag.
> A new quirk MT_QUIRK_SERIAL_REPORT_MODE is defined,
> since PenMount uses serial reporting mode and there is no
> HID_DG_CONTACTCOUNT usage in it's report descriptor.
> 
> Signed-off-by: PenMount <salt@...t.com.tw>
> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@...c.fr>
> ---
>  drivers/hid/Kconfig          |    1 +
>  drivers/hid/hid-core.c       |    1 +
>  drivers/hid/hid-ids.h        |    3 +++
>  drivers/hid/hid-multitouch.c |   14 ++++++++++++++
>  4 files changed, 19 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
> index 996ae3a..8058cf1 100644
> --- a/drivers/hid/Kconfig
> +++ b/drivers/hid/Kconfig
> @@ -313,6 +313,7 @@ config HID_MULTITOUCH
>  	  - Cypress TrueTouch panels
>  	  - Hanvon dual touch panels
>  	  - IrTouch Infrared USB panels
> +	  - PenMount dual touch panels
>  	  - Pixcir dual touch panels
>  	  - 'Sensing Win7-TwoFinger' panel by GeneralTouch
>            - eGalax dual-touch panels, including the
> diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
> index c3d6626..6e31b9f 100644
> --- a/drivers/hid/hid-core.c
> +++ b/drivers/hid/hid-core.c
> @@ -1438,6 +1438,7 @@ static const struct hid_device_id hid_have_special_driver[] = {
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_18) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_ORTEK, USB_DEVICE_ID_ORTEK_PKB1700) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_ORTEK, USB_DEVICE_ID_ORTEK_WKB2000) },
> +	{ HID_USB_DEVICE(USB_VENDOR_ID_PENMOUNT, USB_DEVICE_ID_PENMOUNT_PCI) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_PETALYNX, USB_DEVICE_ID_PETALYNX_MAXTER_REMOTE) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_QUANTA, USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_QUANTA, USB_DEVICE_ID_PIXART_IMAGING_INC_OPTICAL_TOUCH_SCREEN) },
> diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
> index d485894..a4d0505 100644
> --- a/drivers/hid/hid-ids.h
> +++ b/drivers/hid/hid-ids.h
> @@ -487,6 +487,9 @@
>  #define USB_VENDOR_ID_PETALYNX		0x18b1
>  #define USB_DEVICE_ID_PETALYNX_MAXTER_REMOTE	0x0037
>  
> +#define USB_VENDOR_ID_PENMOUNT		0x14e1
> +#define USB_DEVICE_ID_PENMOUNT_PCI	0x3500
> +
>  #define USB_VENDOR_ID_PHILIPS		0x0471
>  #define USB_DEVICE_ID_PHILIPS_IEEE802154_DONGLE 0x0617
>  
> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> index 0175f85..c88d96d 100644
> --- a/drivers/hid/hid-multitouch.c
> +++ b/drivers/hid/hid-multitouch.c
> @@ -50,6 +50,7 @@ MODULE_LICENSE("GPL");
>  #define MT_QUIRK_VALID_IS_INRANGE	(1 << 4)
>  #define MT_QUIRK_VALID_IS_CONFIDENCE	(1 << 5)
>  #define MT_QUIRK_EGALAX_XYZ_FIXUP	(1 << 6)
> +#define MT_QUIRK_SERIAL_REPORT_MODE	(1 << 7)
>  
>  struct mt_slot {
>  	__s32 x, y, p, w, h;
> @@ -89,6 +90,7 @@ struct mt_class {
>  #define MT_CLS_EGALAX				5
>  #define MT_CLS_STANTUM				6
>  #define MT_CLS_3M				7
> +#define MT_CLS_CONFIDENCE_SERIAL_MODE		8
>  
>  #define MT_DEFAULT_MAXCONTACT	10
>  
> @@ -156,6 +158,9 @@ struct mt_class mt_classes[] = {
>  		.sn_move = 2048,
>  		.sn_width = 128,
>  		.sn_height = 128 },
> +	{ .name = MT_CLS_CONFIDENCE_SERIAL_MODE,
> +		.quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
> +			MT_QUIRK_SERIAL_REPORT_MODE },
>  
>  	{ }
>  };
> @@ -196,6 +201,10 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
>  	struct mt_class *cls = td->mtclass;
>  	__s32 quirks = cls->quirks;
>  
> +	if ((quirks & MT_QUIRK_SERIAL_REPORT_MODE) &&
> +		(!td->last_field_index))
> +		td->last_field_index = field->report->maxfield - 1;
> +

Are the events not emitted automatically per touch, if the lines above are omitted?

>  	switch (usage->hid & HID_USAGE_PAGE) {
>  
>  	case HID_UP_GENDESK:
> @@ -585,6 +594,11 @@ static const struct hid_device_id mt_devices[] = {
>  		HID_USB_DEVICE(USB_VENDOR_ID_IRTOUCHSYSTEMS,
>  			USB_DEVICE_ID_IRTOUCH_INFRARED_USB) },
>  
> +	/* PenMount panels */
> +	{  .driver_data = MT_CLS_CONFIDENCE_SERIAL_MODE,
> +		HID_USB_DEVICE(USB_VENDOR_ID_PENMOUNT,
> +			USB_DEVICE_ID_PENMOUNT_PCI) },
> +
>  	/* PixCir-based panels */
>  	{ .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
>  		HID_USB_DEVICE(USB_VENDOR_ID_HANVON,
> -- 
> 1.7.4.1
> 

Benjamin: Since field->index == 0 is in use, it seems the driver could
execute event emission wrongly under some circumstances (when
last_field_index == 0). Is that related to the reason for the quirk in
this patch?

Thanks,
Henrik
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