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Commit 0c3910c2 authored by Stephane Chatty's avatar Stephane Chatty Committed by Jiri Kosina
Browse files

HID: add support for the eGalax dual-touch panel 



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

Signed-off-by: default avatarStephane Chatty <chatty@enac.fr>
Tested-by: default avatarPhilipp Merkel <linux@philmerk.de>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent ab195c58

drivers/hid/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -122,6 +122,12 @@ 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

drivers/hid/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 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

drivers/hid/hid-core.c

+1 −0
Original line number Diff line number Diff line
@@ -1302,6 +1302,7 @@ static const struct hid_device_id hid_blacklist[] = { 
	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3) },

	{ 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) },

drivers/hid/hid-egalax.c

0 → 100644
+280 −0
Original line number Diff line number Diff line 
/*

 *  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);

drivers/hid/hid-ids.h

+3 −0
Original line number Diff line number Diff line
@@ -170,6 +170,9 @@ 


#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