Re: [PATCH] HID: Accutouch: Add driver for ELO Accutouch 2216 USB Touchscreens

[Benjamin Tissoires]

Hi,

On Feb 28 2017 or thereabouts, Martyn Welch wrote:
> This patch has been sitting on the list for about 2 weeks. Is there
> anything wrong with this patch?

The only wrong thing with the patch (I haven't started reviewing it yet)
is the timing. It was sent shortly before or at the time of the merge
window, where Jiri doesn't want to take new patches in, especially if
they add new drivers. For my side, I wasn't able to do much upstream
work for 3 weeks for personal reasons, urgent stuffs at work and time
off. I'll try to review it today or tomorrow, but don't expect Jiri to
take it until the merge window is closed (this Sunday normally, but you
should probably give him some time to process all the backlog from those
past 3 weeks).

Cheers,
Benjamin

> 
> Thanks,
> 
> Martyn
> 
> On Tue, Feb 14, 2017 at 02:17:56PM +0000, Martyn Welch wrote:
> > The Accutouch 2216 is reporting BTN_LEFT/BTN_MOUSE rather than BTM_TOUCH
> > in it's capabilities, which is what user space expects a touchscreen
> > device to report. This is causing udev to consider the device to be a
> > "VMware's USB mouse" rather than as a touchscreen, which results in a
> > mouse cursor being displayed in Weston.
> > 
> > This patch adds a special driver for the device to correct the
> > capabilities reported.
> > 
> > Signed-off-by: Martyn Welch <martyn.welch@xxxxxxxxxxxxxxx>
> > ---
> >  drivers/hid/Kconfig         | 12 +++++++++++
> >  drivers/hid/Makefile        |  1 +
> >  drivers/hid/hid-accutouch.c | 52 +++++++++++++++++++++++++++++++++++++++++++++
> >  drivers/hid/hid-core.c      |  1 +
> >  drivers/hid/hid-ids.h       |  1 +
> >  5 files changed, 67 insertions(+)
> >  create mode 100644 drivers/hid/hid-accutouch.c
> > 
> > diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
> > index 4070b73..ba0d17a 100644
> > --- a/drivers/hid/Kconfig
> > +++ b/drivers/hid/Kconfig
> > @@ -98,6 +98,18 @@ config HID_A4TECH
> >  	---help---
> >  	Support for A4 tech X5 and WOP-35 / Trust 450L mice.
> >  
> > +config HID_ACCUTOUCH
> > +	tristate "Accutouch touch device"
> > +	depends on USB_HID
> > +	---help---
> > +	  This selects a driver for the Accutouch 2216 touch controller.
> > +
> > +	  The driver works around a problem in the reported device capabilities
> > +	  which causes userspace to detect the device as a mouse rather than
> > +          a touchscreen.
> > +
> > +	  Say Y here if you have a Accutouch 2216 touch controller.
> > +
> >  config HID_ACRUX
> >  	tristate "ACRUX game controller support"
> >  	depends on HID
> > diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
> > index 4d111f2..48be3ed 100644
> > --- a/drivers/hid/Makefile
> > +++ b/drivers/hid/Makefile
> > @@ -21,6 +21,7 @@ hid-wiimote-y		:= hid-wiimote-core.o hid-wiimote-modules.o
> >  hid-wiimote-$(CONFIG_DEBUG_FS)	+= hid-wiimote-debug.o
> >  
> >  obj-$(CONFIG_HID_A4TECH)	+= hid-a4tech.o
> > +obj-$(CONFIG_HID_ACCUTOUCH)	+= hid-accutouch.o
> >  obj-$(CONFIG_HID_ALPS)		+= hid-alps.o
> >  obj-$(CONFIG_HID_ACRUX)		+= hid-axff.o
> >  obj-$(CONFIG_HID_APPLE)		+= hid-apple.o
> > diff --git a/drivers/hid/hid-accutouch.c b/drivers/hid/hid-accutouch.c
> > new file mode 100644
> > index 0000000..4e28716
> > --- /dev/null
> > +++ b/drivers/hid/hid-accutouch.c
> > @@ -0,0 +1,52 @@
> > +/*
> > + * HID driver for Elo Accutouch touchscreens
> > + *
> > + * Copyright (c) 2016, Collabora Ltd.
> > + * Copyright (c) 2016, General Electric Company
> > + *
> > + * based on hid-penmount.c
> > + *  Copyright (c) 2014 Christian Gmeiner <christian.gmeiner <at> gmail.com>
> > + */
> > +
> > +/*
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms of the GNU General Public License as published by the Free
> > + * Software Foundation; either version 2 of the License, or (at your option)
> > + * any later version.
> > + */
> > +
> > +#include <linux/hid.h>
> > +#include <linux/module.h>
> > +#include "hid-ids.h"
> > +
> > +static int accutouch_input_mapping(struct hid_device *hdev,
> > +				   struct hid_input *hi,
> > +				   struct hid_field *field,
> > +				   struct hid_usage *usage,
> > +				   unsigned long **bit, int *max)
> > +{
> > +	if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON) {
> > +		hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
> > +		return 1;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct hid_device_id accutouch_devices[] = {
> > +	{ HID_USB_DEVICE(USB_VENDOR_ID_ELO, USB_DEVICE_ID_ELO_ACCUTOUCH_2216) },
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(hid, accutouch_devices);
> > +
> > +static struct hid_driver accutouch_driver = {
> > +	.name = "hid-accutouch",
> > +	.id_table = accutouch_devices,
> > +	.input_mapping = accutouch_input_mapping,
> > +};
> > +
> > +module_hid_driver(accutouch_driver);
> > +
> > +MODULE_AUTHOR("Martyn Welch <martyn.welch@xxxxxxxxxxxxxxx");
> > +MODULE_DESCRIPTION("Elo Accutouch HID TouchScreen driver");
> > +MODULE_LICENSE("GPL");
> > diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
> > index ea36b55..b697491 100644
> > --- a/drivers/hid/hid-core.c
> > +++ b/drivers/hid/hid-core.c
> > @@ -1893,6 +1893,7 @@ void hid_disconnect(struct hid_device *hdev)
> >  	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_BM084) },
> >  	{ HID_USB_DEVICE(USB_VENDOR_ID_ELO, 0x0009) },
> >  	{ HID_USB_DEVICE(USB_VENDOR_ID_ELO, 0x0030) },
> > +	{ HID_USB_DEVICE(USB_VENDOR_ID_ELO, USB_DEVICE_ID_ELO_ACCUTOUCH_2216) },
> >  	{ HID_USB_DEVICE(USB_VENDOR_ID_EMS, USB_DEVICE_ID_EMS_TRIO_LINKER_PLUS_II) },
> >  	{ HID_USB_DEVICE(USB_VENDOR_ID_EZKEY, USB_DEVICE_ID_BTC_8193) },
> >  	{ HID_USB_DEVICE(USB_VENDOR_ID_GAMERON, USB_DEVICE_ID_GAMERON_DUAL_PSX_ADAPTOR) },
> > diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
> > index 350accf..9472ef2 100644
> > --- a/drivers/hid/hid-ids.h
> > +++ b/drivers/hid/hid-ids.h
> > @@ -362,6 +362,7 @@
> >  #define USB_VENDOR_ID_ELO		0x04E7
> >  #define USB_DEVICE_ID_ELO_TS2515	0x0022
> >  #define USB_DEVICE_ID_ELO_TS2700	0x0020
> > +#define USB_DEVICE_ID_ELO_ACCUTOUCH_2216	0x0050
> >  
> >  #define USB_VENDOR_ID_EMS		0x2006
> >  #define USB_DEVICE_ID_EMS_TRIO_LINKER_PLUS_II 0x0118
> > -- 
> > 1.8.3.1
> > 
> > --
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