[PATCH] Support for the eGalax dual-touch panel

[PATCH] Support for the eGalax dual-touch panel

[Stephane Chatty]

Added support for the eGalax dual-touch panel, found on the Asus EeePC T101MT

Signed-off-by: Stephane Chatty <chatty@enac.fr>
Tested-by: Philipp Merkel <linux@philmerk.de>

diff -rupN a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
--- a/drivers/hid/hid-core.c	2010-04-10 17:33:43.000000000 +0200
+++ b/drivers/hid/hid-core.c	2010-04-07 00:02:12.000000000 +0200
@@ -1280,6 +1280,7 @@ static const struct hid_device_id hid_bl
 	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_DRAGONRISE, 0x0006) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV, USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) },
 	{ 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) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_GAMERON, USB_DEVICE_ID_GAMERON_DUAL_PCS_ADAPTOR) },
diff -rupN a/drivers/hid/hid-egalax.c b/drivers/hid/hid-egalax.c
--- a/drivers/hid/hid-egalax.c	1970-01-01 01:00:00.000000000 +0100
+++ b/drivers/hid/hid-egalax.c	2010-04-10 17:31:47.000000000 +0200
@@ -0,0 +1,280 @@
+/*
+ *  HID driver for eGalax dual-touch panels
+ *
+ *  Copyright (c) 2010 Stephane Chatty <chatty@enac.fr>
+ *
+ */
+
+/*
+ * 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/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include "usbhid/usbhid.h"
+
+MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
+MODULE_DESCRIPTION("eGalax dual-touch panel");
+MODULE_LICENSE("GPL");
+
+#include "hid-ids.h"
+
+struct egalax_data {
+	__u16 x, y, z;
+	__u8 id;
+	bool first;		/* is this the first finger in the frame? */
+	bool valid;		/* valid finger data, or just placeholder? */
+	bool activity;		/* at least one active finger previously? */
+	__u16 lastx, lasty;	/* latest valid (x, y) in the frame */
+};
+
+static int egalax_input_mapping(struct hid_device *hdev, struct hid_input *hi,
+		struct hid_field *field, struct hid_usage *usage,
+		unsigned long **bit, int *max)
+{
+	switch (usage->hid & HID_USAGE_PAGE) {
+
+	case HID_UP_GENDESK:
+		switch (usage->hid) {
+		case HID_GD_X:
+			hid_map_usage(hi, usage, bit, max,
+					EV_ABS, ABS_MT_POSITION_X);
+			/* touchscreen emulation */
+			input_set_abs_params(hi->input, ABS_X,
+						field->logical_minimum,
+						field->logical_maximum, 0, 0);
+			return 1;
+		case HID_GD_Y:
+			hid_map_usage(hi, usage, bit, max,
+					EV_ABS, ABS_MT_POSITION_Y);
+			/* touchscreen emulation */
+			input_set_abs_params(hi->input, ABS_Y,
+						field->logical_minimum,
+						field->logical_maximum, 0, 0);
+			return 1;
+		}
+		return 0;
+
+	case HID_UP_DIGITIZER:
+		switch (usage->hid) {
+		case HID_DG_TIPSWITCH:
+			/* touchscreen emulation */
+			hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
+			return 1;
+		case HID_DG_INRANGE:
+		case HID_DG_CONFIDENCE:
+		case HID_DG_CONTACTCOUNT:
+		case HID_DG_CONTACTMAX:
+			return -1;
+		case HID_DG_CONTACTID:
+			hid_map_usage(hi, usage, bit, max,
+					EV_ABS, ABS_MT_TRACKING_ID);
+			return 1;
+		case HID_DG_TIPPRESSURE:
+			hid_map_usage(hi, usage, bit, max,
+					EV_ABS, ABS_MT_PRESSURE);
+			return 1;
+		}
+		return 0;
+	}
+
+	/* ignore others (from other reports we won't get anyway) */
+	return -1;
+}
+
+static int egalax_input_mapped(struct hid_device *hdev, struct hid_input *hi,
+		struct hid_field *field, struct hid_usage *usage,
+		unsigned long **bit, int *max)
+{
+	if (usage->type == EV_KEY || usage->type == EV_ABS)
+		clear_bit(usage->code, *bit);
+
+	return 0;
+}
+
+/*
+ * this function is called when a whole finger has been parsed,
+ * so that it can decide what to send to the input layer.
+ */
+static void egalax_filter_event(struct egalax_data *td, struct input_dev *input)
+{
+	td->first = !td->first; /* touchscreen emulation */
+
+	if (td->valid) {
+		/* emit multitouch events */
+		input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id);
+		input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x);
+		input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y);
+		input_event(input, EV_ABS, ABS_MT_PRESSURE, td->z);
+
+		input_mt_sync(input);
+
+		/*
+		 * touchscreen emulation: store (x, y) as
+		 * the last valid values in this frame
+		 */
+		td->lastx = td->x;
+		td->lasty = td->y;
+	}
+
+	/*
+	 * touchscreen emulation: if this is the second finger and at least
+	 * one in this frame is valid, the latest valid in the frame is
+	 * the oldest on the panel, the one we want for single touch
+	 */
+	if (!td->first && td->activity) {
+		input_event(input, EV_ABS, ABS_X, td->lastx);
+		input_event(input, EV_ABS, ABS_Y, td->lasty);
+	}
+
+	if (!td->valid) {
+		/*
+		 * touchscreen emulation: if the first finger is invalid
+		 * and there previously was finger activity, this is a release
+		 */ 
+		if (td->first && td->activity) {
+			input_event(input, EV_KEY, BTN_TOUCH, 0);
+			td->activity = false;
+		}
+		return;
+	}
+
+
+	/* touchscreen emulation: if no previous activity, emit touch event */
+	if (!td->activity) {
+		input_event(input, EV_KEY, BTN_TOUCH, 1);
+		td->activity = true;
+	}
+}
+
+
+static int egalax_event(struct hid_device *hid, struct hid_field *field,
+				struct hid_usage *usage, __s32 value)
+{
+	struct egalax_data *td = hid_get_drvdata(hid);
+
+	if (hid->claimed & HID_CLAIMED_INPUT) {
+		struct input_dev *input = field->hidinput->input;
+
+		switch (usage->hid) {
+		case HID_DG_INRANGE:
+		case HID_DG_CONFIDENCE:
+			/* avoid interference from generic hidinput handling */
+			break;
+		case HID_DG_TIPSWITCH:
+			td->valid = value;
+			break;
+		case HID_DG_TIPPRESSURE:
+			td->z = value;
+			break;
+		case HID_DG_CONTACTID:
+			td->id = value;
+			break;
+		case HID_GD_X:
+			td->x = value;
+			break;
+		case HID_GD_Y:
+			td->y = value;
+			/* this is the last field in a finger */
+			egalax_filter_event(td, input);
+			break;
+		case HID_DG_CONTACTCOUNT:
+			/* touch emulation: this is the last field in a frame */
+			td->first = false;
+			break;
+
+		default:
+			/* fallback to the generic hidinput handling */
+			return 0;
+		}
+	}
+
+	/* we have handled the hidinput part, now remains hiddev */
+	if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
+		hid->hiddev_hid_event(hid, field, usage, value);
+
+	return 1;
+}
+
+static int egalax_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+	int ret;
+	struct egalax_data *td;
+	struct hid_report *report;
+
+	td = kmalloc(sizeof(struct egalax_data), GFP_KERNEL);
+	if (!td) {
+		dev_err(&hdev->dev, "cannot allocate eGalax data\n");
+		return -ENOMEM;
+	}
+	hid_set_drvdata(hdev, td);
+
+	ret = hid_parse(hdev);
+	if (ret)
+		goto end;
+
+	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+	if (ret)
+		goto end;
+
+	report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[5]; 
+	if (report) {
+		report->field[0]->value[0] = 2;
+		usbhid_submit_report(hdev, report, USB_DIR_OUT);
+	}
+
+end:
+	if (ret)
+		kfree(td);
+
+	return ret;
+}
+
+static void egalax_remove(struct hid_device *hdev)
+{
+	hid_hw_stop(hdev);
+	kfree(hid_get_drvdata(hdev));
+	hid_set_drvdata(hdev, NULL);
+}
+
+static const struct hid_device_id egalax_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
+			USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) },
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, egalax_devices);
+
+static const struct hid_usage_id egalax_grabbed_usages[] = {
+	{ HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
+	{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
+};
+
+static struct hid_driver egalax_driver = {
+	.name = "egalax-touch",
+	.id_table = egalax_devices,
+	.probe = egalax_probe,
+	.remove = egalax_remove,
+	.input_mapping = egalax_input_mapping,
+	.input_mapped = egalax_input_mapped,
+	.usage_table = egalax_grabbed_usages,
+	.event = egalax_event,
+};
+
+static int __init egalax_init(void)
+{
+	return hid_register_driver(&egalax_driver);
+}
+
+static void __exit egalax_exit(void)
+{
+	hid_unregister_driver(&egalax_driver);
+}
+
+module_init(egalax_init);
+module_exit(egalax_exit);
+
diff -rupN a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
--- a/drivers/hid/hid-ids.h	2010-04-10 17:33:34.000000000 +0200
+++ b/drivers/hid/hid-ids.h	2010-04-07 00:02:12.000000000 +0200
@@ -164,6 +164,9 @@
 
 #define USB_VENDOR_ID_DRAGONRISE	0x0079
 
+#define USB_VENDOR_ID_DWAV		0x0eef
+#define USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH	0x480d
+
 #define USB_VENDOR_ID_ELO		0x04E7
 #define USB_DEVICE_ID_ELO_TS2700	0x0020
 
diff -rupN a/drivers/hid/Kconfig b/drivers/hid/Kconfig
--- a/drivers/hid/Kconfig	2010-04-10 17:29:33.000000000 +0200
+++ b/drivers/hid/Kconfig	2010-04-07 00:02:12.000000000 +0200
@@ -144,6 +144,12 @@ config DRAGONRISE_FF
 	Say Y here if you want to enable force feedback support for DragonRise Inc.
 	game controllers.
 
+config HID_EGALAX
+	tristate "eGalax multi-touch panel"
+	depends on USB_HID
+	---help---
+	Support for the eGalax dual-touch panel
+
 config HID_EZKEY
 	tristate "Ezkey" if EMBEDDED
 	depends on USB_HID
diff -rupN a/drivers/hid/Makefile b/drivers/hid/Makefile
--- a/drivers/hid/Makefile	2010-04-10 17:33:14.000000000 +0200
+++ b/drivers/hid/Makefile	2010-04-10 17:30:32.000000000 +0200
@@ -23,6 +23,7 @@ obj-$(CONFIG_HID_CHERRY)	+= hid-cherry.o
 obj-$(CONFIG_HID_CHICONY)	+= hid-chicony.o
 obj-$(CONFIG_HID_CYPRESS)	+= hid-cypress.o
 obj-$(CONFIG_HID_DRAGONRISE)	+= hid-drff.o
+obj-$(CONFIG_HID_EGALAX)	+= hid-egalax.o
 obj-$(CONFIG_HID_EZKEY)		+= hid-ezkey.o
 obj-$(CONFIG_HID_GYRATION)	+= hid-gyration.o
 obj-$(CONFIG_HID_KENSINGTON)	+= hid-kensington.o

Re: [PATCH] Support for the eGalax dual-touch panel

[Christoph Fritz]

Am Samstag, den 10.04.2010, 16:43 +0200 schrieb Stephane Chatty:
> Added support for the eGalax dual-touch panel, found on the Asus EeePC T101MT

> diff -rupN a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c

> +#include <linux/device.h>
> +#include <linux/hid.h>
> +#include <linux/module.h>
> +#include <linux/usb.h>

add #include <linux/slab.h>

> +	if (!td->valid) {
> +		/*
> +		 * touchscreen emulation: if the first finger is invalid
> +		 * and there previously was finger activity, this is a release
> +		 */ 
whitespace

> +	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
> +	if (ret)
> +		goto end;
> +
> +	report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[5]; 
whitespace

Re: [PATCH] Support for the eGalax dual-touch panel

[Christoph Fritz]

Am Samstag, den 10.04.2010, 16:43 +0200 schrieb Stephane Chatty:
> Added support for the eGalax dual-touch panel, found on the Asus EeePC T101MT

> +static void egalax_remove(struct hid_device *hdev)
> +{
> +	hid_hw_stop(hdev);
> +	kfree(hid_get_drvdata(hdev));
> +	hid_set_drvdata(hdev, NULL);
> +}

Why not using hid_hw_stop() instead of hid_set_drvdata()?

Re: [PATCH] Support for the eGalax dual-touch panel

[Stéphane Chatty]

Le 10 avr. 10 à 18:04, Christoph Fritz a écrit :

> Am Samstag, den 10.04.2010, 16:43 +0200 schrieb Stephane Chatty:
>> Added support for the eGalax dual-touch panel, found on the Asus  
>> EeePC T101MT
>
>> +static void egalax_remove(struct hid_device *hdev)
>> +{
>> +	hid_hw_stop(hdev);
>> +	kfree(hid_get_drvdata(hdev));
>> +	hid_set_drvdata(hdev, NULL);
>> +}
>
> Why not using hid_hw_stop() instead of hid_set_drvdata()?
>

Er, actually for a previous driver Dmitry suggested to add this line  
and I did it without trying to understand :-)

St.

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Re: [PATCH] Support for the eGalax dual-touch panel

[Jiri Kosina]

On Sat, 10 Apr 2010, Stéphane Chatty wrote:

> > Am Samstag, den 10.04.2010, 16:43 +0200 schrieb Stephane Chatty:
> > > Added support for the eGalax dual-touch panel, found on the Asus EeePC
> > > T101MT
> > 
> > > +static void egalax_remove(struct hid_device *hdev)
> > > +{
> > > +	hid_hw_stop(hdev);
> > > +	kfree(hid_get_drvdata(hdev));
> > > +	hid_set_drvdata(hdev, NULL);
> > > +}
> > 
> > Why not using hid_hw_stop() instead of hid_set_drvdata()?
> > 
> 
> Er, actually for a previous driver Dmitry suggested to add this line and 
> I did it without trying to understand :-)

Currently no code should be relying on this, but it's always nice/safe to 
do such initialization. 

Using 'if (!hdev)' to check whether hdev is valid/initialized or not 
should be always legitimate thing to do.

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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Re: [PATCH] Support for the eGalax dual-touch panel

[Jiri Kosina]

On Sat, 10 Apr 2010, Stephane Chatty wrote:

> Added support for the eGalax dual-touch panel, found on the Asus EeePC 
> T101MT

Thanks a lot for the driver!

> +	case HID_UP_DIGITIZER:
> +		switch (usage->hid) {
> +		case HID_DG_TIPSWITCH:
> +			/* touchscreen emulation */
> +			hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
> +			return 1;
> +		case HID_DG_INRANGE:
> +		case HID_DG_CONFIDENCE:
> +		case HID_DG_CONTACTCOUNT:
> +		case HID_DG_CONTACTMAX:
> +			return -1;
> +		case HID_DG_CONTACTID:
> +			hid_map_usage(hi, usage, bit, max,
> +					EV_ABS, ABS_MT_TRACKING_ID);
> +			return 1;
> +		case HID_DG_TIPPRESSURE:
> +			hid_map_usage(hi, usage, bit, max,
> +					EV_ABS, ABS_MT_PRESSURE);
> +			return 1;
> +		}
> +		return 0;
> +	}
> +
> +	/* ignore others (from other reports we won't get anyway) */

>From other reports we won't get what anyway?

Otherwise the driver looks OK to me, I'll add the slab.h include as 
noticed by Christoph (as implicit slab.h inclusion has gone away in 
mainline already).

Thanks,

-- 
Jiri Kosina
SUSE Labs, Novell Inc.

Re: [PATCH] Support for the eGalax dual-touch panel

[Stéphane Chatty]

Le 10 avr. 10 à 21:25, Jiri Kosina a écrit :

>> From other reports we won't get what anyway?

The device sends either multitouch or touchpad-like reports depending  
on which mode it's in. In _probe we set it in multitouch mode, and  
therefore we can safely ignore the touchpad fields from the report  
descriptors.


> Otherwise the driver looks OK to me, I'll add the slab.h include as
> noticed by Christoph (as implicit slab.h inclusion has gone away in
> mainline already).

Thx.

St.

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Re: [PATCH] Support for the eGalax dual-touch panel

[Dmitry Torokhov]

On Sat, Apr 10, 2010 at 09:19:17PM +0200, Jiri Kosina wrote:
> On Sat, 10 Apr 2010, Stéphane Chatty wrote:
> 
> > > Am Samstag, den 10.04.2010, 16:43 +0200 schrieb Stephane Chatty:
> > > > Added support for the eGalax dual-touch panel, found on the Asus EeePC
> > > > T101MT
> > > 
> > > > +static void egalax_remove(struct hid_device *hdev)
> > > > +{
> > > > +	hid_hw_stop(hdev);
> > > > +	kfree(hid_get_drvdata(hdev));
> > > > +	hid_set_drvdata(hdev, NULL);
> > > > +}
> > > 
> > > Why not using hid_hw_stop() instead of hid_set_drvdata()?
> > > 
> > 
> > Er, actually for a previous driver Dmitry suggested to add this line and 
> > I did it without trying to understand :-)
> 
> Currently no code should be relying on this, but it's always nice/safe to 
> do such initialization. 
> 
> Using 'if (!hdev)' to check whether hdev is valid/initialized or not 
> should be always legitimate thing to do.

How can hdev be NULL? You did you mean hid_get_drvdata(hdev) != NULL?
In general as a driver writer I'd expect data structiures passed to me
by the core (in this case hid core) be initialized and useable...

-- 
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Re: [PATCH] Support for the eGalax dual-touch panel

[Dmitry Torokhov]

On Sat, Apr 10, 2010 at 08:00:59PM +0200, Stéphane Chatty wrote:
> 
> Le 10 avr. 10 à 18:04, Christoph Fritz a écrit :
> 
> >Am Samstag, den 10.04.2010, 16:43 +0200 schrieb Stephane Chatty:
> >>Added support for the eGalax dual-touch panel, found on the Asus
> >>EeePC T101MT
> >
> >>+static void egalax_remove(struct hid_device *hdev)
> >>+{
> >>+	hid_hw_stop(hdev);
> >>+	kfree(hid_get_drvdata(hdev));
> >>+	hid_set_drvdata(hdev, NULL);
> >>+}
> >
> >Why not using hid_hw_stop() instead of hid_set_drvdata()?
> >

It is used 2 lines above, isn't it?

> 
> Er, actually for a previous driver Dmitry suggested to add this line
> and I did it without trying to understand :-)
> 

You normally want to reset any pointers you set before, unless core does
this for you. As far as I know only i2c guys decided to move that into
core so far.

-- 
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Re: [PATCH] Support for the eGalax dual-touch panel

[Jiri Kosina]

On Sun, 11 Apr 2010, Dmitry Torokhov wrote:

> > > > > +static void egalax_remove(struct hid_device *hdev)
> > > > > +{
> > > > > +	hid_hw_stop(hdev);
> > > > > +	kfree(hid_get_drvdata(hdev));
> > > > > +	hid_set_drvdata(hdev, NULL);
> > > > > +}
> > > > 
> > > > Why not using hid_hw_stop() instead of hid_set_drvdata()?
> > > > 
> > > 
> > > Er, actually for a previous driver Dmitry suggested to add this line and 
> > > I did it without trying to understand :-)
> > 
> > Currently no code should be relying on this, but it's always nice/safe to 
> > do such initialization. 
> > 
> > Using 'if (!hdev)' to check whether hdev is valid/initialized or not 
> > should be always legitimate thing to do.
> 
> How can hdev be NULL? You did you mean hid_get_drvdata(hdev) != NULL?

Yup, sorry.

-- 
Jiri Kosina
SUSE Labs, Novell Inc.

Re: [PATCH] Support for the eGalax dual-touch panel

[Christoph Fritz]

2010/4/12 Dmitry Torokhov <dmitry.torokhov@gmail.com>:
> On Sat, Apr 10, 2010 at 08:00:59PM +0200, Stéphane Chatty wrote:
>>
>> Le 10 avr. 10 à 18:04, Christoph Fritz a écrit :
>>
>> >Am Samstag, den 10.04.2010, 16:43 +0200 schrieb Stephane Chatty:
>> >>Added support for the eGalax dual-touch panel, found on the Asus
>> >>EeePC T101MT
>> >
>> >>+static void egalax_remove(struct hid_device *hdev)
>> >>+{
>> >>+   hid_hw_stop(hdev);
>> >>+   kfree(hid_get_drvdata(hdev));
>> >>+   hid_set_drvdata(hdev, NULL);
>> >>+}
>> >
>> >Why not using hid_hw_stop() instead of hid_set_drvdata()?
>> >
>
> It is used 2 lines above, isn't it?

sure, that's why I asked (overdetermined)

>
>>
>> Er, actually for a previous driver Dmitry suggested to add this line
>> and I did it without trying to understand :-)
>>
>
> You normally want to reset any pointers you set before, unless core does
> this for you. As far as I know only i2c guys decided to move that into
> core so far.

Should we do this too in a long run?
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