drivers/hid/hid-egalax.c - kernel/skids - Git at Google

 /*
  *  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 <linux/slab.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, lastz;	/* latest valid (x, y, z) 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);
 			/* touchscreen emulation */
 			input_set_abs_params(hi->input, ABS_PRESSURE,
 						field->logical_minimum,
 						field->logical_maximum, 0, 0);
 			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 >> 3);
 		input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y >> 3);
 		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;
 		td->lastz = td->z;
 	}

 	/*
 	 * 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 >> 3);
 		input_event(input, EV_ABS, ABS_Y, td->lasty >> 3);
  		input_event(input, EV_ABS, ABS_PRESSURE, td->lastz);
 	}

 	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);
	/*
	* 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 <linux/slab.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, lastz; /* latest valid (x, y, z) 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);
	/* touchscreen emulation */
	input_set_abs_params(hi->input, ABS_PRESSURE,
	field->logical_minimum,
	field->logical_maximum, 0, 0);
	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 >> 3);
	input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y >> 3);
	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;
	td->lastz = td->z;
	}

	/*
	* 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 >> 3);
	input_event(input, EV_ABS, ABS_Y, td->lasty >> 3);
	input_event(input, EV_ABS, ABS_PRESSURE, td->lastz);
	}

	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);