drivers/hid/hid-3m-pct.c - kernel/skids - Git at Google

 /*
  *  HID driver for 3M PCT multitouch panels
  *
  *  Copyright (c) 2009-2010 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/slab.h>
 #include <linux/usb.h>

 MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
 MODULE_DESCRIPTION("3M PCT multitouch panels");
 MODULE_LICENSE("GPL");

 #include "hid-ids.h"

 struct mmm_finger {
 	__s32 x, y, w, h;
 	__u8 rank;
 	bool touch, valid;
 };

 struct mmm_data {
 	struct mmm_finger f[10];
 	__u8 curid, num;
 	bool touch, valid;
 };

 static int mmm_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_BUTTON:
 		return -1;

 	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) {
 		/* we do not want to map these: no input-oriented meaning */
 		case 0x14:
 		case 0x23:
 		case HID_DG_INPUTMODE:
 		case HID_DG_DEVICEINDEX:
 		case HID_DG_CONTACTCOUNT:
 		case HID_DG_CONTACTMAX:
 		case HID_DG_INRANGE:
 		case HID_DG_CONFIDENCE:
 			return -1;
 		case HID_DG_TIPSWITCH:
 			/* touchscreen emulation */
 			hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
 			return 1;
 		case HID_DG_WIDTH:
 			hid_map_usage(hi, usage, bit, max,
 					EV_ABS, ABS_MT_TOUCH_MAJOR);
 			return 1;
 		case HID_DG_HEIGHT:
 			hid_map_usage(hi, usage, bit, max,
 					EV_ABS, ABS_MT_TOUCH_MINOR);
 			input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
 					1, 1, 0, 0);
 			return 1;
 		case HID_DG_CONTACTID:
 			field->logical_maximum = 59;
 			hid_map_usage(hi, usage, bit, max,
 					EV_ABS, ABS_MT_TRACKING_ID);
 			return 1;
 		}
 		/* let hid-input decide for the others */
 		return 0;

 	case 0xff000000:
 		/* we do not want to map these: no input-oriented meaning */
 		return -1;
 	}

 	return 0;
 }

 static int mmm_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 packet has been received and processed,
  * so that it can decide what to send to the input layer.
  */
 static void mmm_filter_event(struct mmm_data *md, struct input_dev *input)
 {
 	struct mmm_finger *oldest = 0;
 	bool pressed = false, released = false;
 	int i;

 	/*
 	 * we need to iterate on all fingers to decide if we have a press
 	 * or a release event in our touchscreen emulation.
 	 */
 	for (i = 0; i < 10; ++i) {
 		struct mmm_finger *f = &md->f[i];
 		if (!f->valid) {
 			/* this finger is just placeholder data, ignore */
 		} else if (f->touch) {
 			/* this finger is on the screen */
 			int wide = (f->w > f->h);
 			input_event(input, EV_ABS, ABS_MT_TRACKING_ID, i);
 			input_event(input, EV_ABS, ABS_MT_POSITION_X, f->x);
 			input_event(input, EV_ABS, ABS_MT_POSITION_Y, f->y);
 			input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
 			input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR,
 						wide ? f->w : f->h);
 			input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR,
 						wide ? f->h : f->w);
 			input_mt_sync(input);
 			/*
 			 * touchscreen emulation: maintain the age rank
 			 * of this finger, decide if we have a press
 			 */
 			if (f->rank == 0) {
 				f->rank = ++(md->num);
 				if (f->rank == 1)
 					pressed = true;
 			}
 			if (f->rank == 1)
 				oldest = f;
 		} else {
 			/* this finger took off the screen */
 			/* touchscreen emulation: maintain age rank of others */
 			int j;

 			for (j = 0; j < 10; ++j) {
 				struct mmm_finger *g = &md->f[j];
 				if (g->rank > f->rank) {
 					g->rank--;
 					if (g->rank == 1)
 						oldest = g;
 				}
 			}
 			f->rank = 0;
 			--(md->num);
 			if (md->num == 0)
 				released = true;
 		}
 		f->valid = 0;
 	}

 	/* touchscreen emulation */
 	if (oldest) {
 		if (pressed)
 			input_event(input, EV_KEY, BTN_TOUCH, 1);
 		input_event(input, EV_ABS, ABS_X, oldest->x);
 		input_event(input, EV_ABS, ABS_Y, oldest->y);
 	} else if (released) {
 		input_event(input, EV_KEY, BTN_TOUCH, 0);
 	}
 }

 /*
  * this function is called upon all reports
  * so that we can accumulate contact point information,
  * and call input_mt_sync after each point.
  */
 static int mmm_event(struct hid_device *hid, struct hid_field *field,
 				struct hid_usage *usage, __s32 value)
 {
 	struct mmm_data *md = hid_get_drvdata(hid);
 	/*
 	 * strangely, this function can be called before
 	 * field->hidinput is initialized!
 	 */
 	if (hid->claimed & HID_CLAIMED_INPUT) {
 		struct input_dev *input = field->hidinput->input;
 		switch (usage->hid) {
 		case HID_DG_TIPSWITCH:
 			md->touch = value;
 			break;
 		case HID_DG_CONFIDENCE:
 			md->valid = value;
 			break;
 		case HID_DG_WIDTH:
 			if (md->valid)
 				md->f[md->curid].w = value;
 			break;
 		case HID_DG_HEIGHT:
 			if (md->valid)
 				md->f[md->curid].h = value;
 			break;
 		case HID_DG_CONTACTID:
 			if (md->valid) {
 				md->curid = value;
 				md->f[value].touch = md->touch;
 				md->f[value].valid = 1;
 			}
 			break;
 		case HID_GD_X:
 			if (md->valid)
 				md->f[md->curid].x = value;
 			break;
 		case HID_GD_Y:
 			if (md->valid)
 				md->f[md->curid].y = value;
 			break;
 		case HID_DG_CONTACTCOUNT:
 			mmm_filter_event(md, input);
 			break;
 		}
 	}

 	/* 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 mmm_probe(struct hid_device *hdev, const struct hid_device_id *id)
 {
 	int ret;
 	struct mmm_data *md;

 	md = kzalloc(sizeof(struct mmm_data), GFP_KERNEL);
 	if (!md) {
 		dev_err(&hdev->dev, "cannot allocate 3M data\n");
 		return -ENOMEM;
 	}
 	hid_set_drvdata(hdev, md);

 	ret = hid_parse(hdev);
 	if (!ret)
 		ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);

 	if (ret)
 		kfree(md);
 	return ret;
 }

 static void mmm_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 mmm_devices[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_3M, USB_DEVICE_ID_3M1968) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_3M, USB_DEVICE_ID_3M2256) },
 	{ }
 };
 MODULE_DEVICE_TABLE(hid, mmm_devices);

 static const struct hid_usage_id mmm_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 mmm_driver = {
 	.name = "3m-pct",
 	.id_table = mmm_devices,
 	.probe = mmm_probe,
 	.remove = mmm_remove,
 	.input_mapping = mmm_input_mapping,
 	.input_mapped = mmm_input_mapped,
 	.usage_table = mmm_grabbed_usages,
 	.event = mmm_event,
 };

 static int __init mmm_init(void)
 {
 	return hid_register_driver(&mmm_driver);
 }

 static void __exit mmm_exit(void)
 {
 	hid_unregister_driver(&mmm_driver);
 }

 module_init(mmm_init);
 module_exit(mmm_exit);
	/*
	* HID driver for 3M PCT multitouch panels
	*
	* Copyright (c) 2009-2010 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/slab.h>
	#include <linux/usb.h>

	MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
	MODULE_DESCRIPTION("3M PCT multitouch panels");
	MODULE_LICENSE("GPL");

	#include "hid-ids.h"

	struct mmm_finger {
	__s32 x, y, w, h;
	__u8 rank;
	bool touch, valid;
	};

	struct mmm_data {
	struct mmm_finger f[10];
	__u8 curid, num;
	bool touch, valid;
	};

	static int mmm_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_BUTTON:
	return -1;

	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) {
	/* we do not want to map these: no input-oriented meaning */
	case 0x14:
	case 0x23:
	case HID_DG_INPUTMODE:
	case HID_DG_DEVICEINDEX:
	case HID_DG_CONTACTCOUNT:
	case HID_DG_CONTACTMAX:
	case HID_DG_INRANGE:
	case HID_DG_CONFIDENCE:
	return -1;
	case HID_DG_TIPSWITCH:
	/* touchscreen emulation */
	hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
	return 1;
	case HID_DG_WIDTH:
	hid_map_usage(hi, usage, bit, max,
	EV_ABS, ABS_MT_TOUCH_MAJOR);
	return 1;
	case HID_DG_HEIGHT:
	hid_map_usage(hi, usage, bit, max,
	EV_ABS, ABS_MT_TOUCH_MINOR);
	input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
	1, 1, 0, 0);
	return 1;
	case HID_DG_CONTACTID:
	field->logical_maximum = 59;
	hid_map_usage(hi, usage, bit, max,
	EV_ABS, ABS_MT_TRACKING_ID);
	return 1;
	}
	/* let hid-input decide for the others */
	return 0;

	case 0xff000000:
	/* we do not want to map these: no input-oriented meaning */
	return -1;
	}

	return 0;
	}

	static int mmm_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 packet has been received and processed,
	* so that it can decide what to send to the input layer.
	*/
	static void mmm_filter_event(struct mmm_data md, struct input_dev input)
	{
	struct mmm_finger *oldest = 0;
	bool pressed = false, released = false;
	int i;

	/*
	* we need to iterate on all fingers to decide if we have a press
	* or a release event in our touchscreen emulation.
	*/
	for (i = 0; i < 10; ++i) {
	struct mmm_finger *f = &md->f[i];
	if (!f->valid) {
	/* this finger is just placeholder data, ignore */
	} else if (f->touch) {
	/* this finger is on the screen */
	int wide = (f->w > f->h);
	input_event(input, EV_ABS, ABS_MT_TRACKING_ID, i);
	input_event(input, EV_ABS, ABS_MT_POSITION_X, f->x);
	input_event(input, EV_ABS, ABS_MT_POSITION_Y, f->y);
	input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
	input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR,
	wide ? f->w : f->h);
	input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR,
	wide ? f->h : f->w);
	input_mt_sync(input);
	/*
	* touchscreen emulation: maintain the age rank
	* of this finger, decide if we have a press
	*/
	if (f->rank == 0) {
	f->rank = ++(md->num);
	if (f->rank == 1)
	pressed = true;
	}
	if (f->rank == 1)
	oldest = f;
	} else {
	/* this finger took off the screen */
	/* touchscreen emulation: maintain age rank of others */
	int j;

	for (j = 0; j < 10; ++j) {
	struct mmm_finger *g = &md->f[j];
	if (g->rank > f->rank) {
	g->rank--;
	if (g->rank == 1)
	oldest = g;
	}
	}
	f->rank = 0;
	--(md->num);
	if (md->num == 0)
	released = true;
	}
	f->valid = 0;
	}

	/* touchscreen emulation */
	if (oldest) {
	if (pressed)
	input_event(input, EV_KEY, BTN_TOUCH, 1);
	input_event(input, EV_ABS, ABS_X, oldest->x);
	input_event(input, EV_ABS, ABS_Y, oldest->y);
	} else if (released) {
	input_event(input, EV_KEY, BTN_TOUCH, 0);
	}
	}

	/*
	* this function is called upon all reports
	* so that we can accumulate contact point information,
	* and call input_mt_sync after each point.
	*/
	static int mmm_event(struct hid_device hid, struct hid_field field,
	struct hid_usage *usage, __s32 value)
	{
	struct mmm_data *md = hid_get_drvdata(hid);
	/*
	* strangely, this function can be called before
	* field->hidinput is initialized!
	*/
	if (hid->claimed & HID_CLAIMED_INPUT) {
	struct input_dev *input = field->hidinput->input;
	switch (usage->hid) {
	case HID_DG_TIPSWITCH:
	md->touch = value;
	break;
	case HID_DG_CONFIDENCE:
	md->valid = value;
	break;
	case HID_DG_WIDTH:
	if (md->valid)
	md->f[md->curid].w = value;
	break;
	case HID_DG_HEIGHT:
	if (md->valid)
	md->f[md->curid].h = value;
	break;
	case HID_DG_CONTACTID:
	if (md->valid) {
	md->curid = value;
	md->f[value].touch = md->touch;
	md->f[value].valid = 1;
	}
	break;
	case HID_GD_X:
	if (md->valid)
	md->f[md->curid].x = value;
	break;
	case HID_GD_Y:
	if (md->valid)
	md->f[md->curid].y = value;
	break;
	case HID_DG_CONTACTCOUNT:
	mmm_filter_event(md, input);
	break;
	}
	}

	/* 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 mmm_probe(struct hid_device hdev, const struct hid_device_id id)
	{
	int ret;
	struct mmm_data *md;

	md = kzalloc(sizeof(struct mmm_data), GFP_KERNEL);
	if (!md) {
	dev_err(&hdev->dev, "cannot allocate 3M data\n");
	return -ENOMEM;
	}
	hid_set_drvdata(hdev, md);

	ret = hid_parse(hdev);
	if (!ret)
	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);

	if (ret)
	kfree(md);
	return ret;
	}

	static void mmm_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 mmm_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_3M, USB_DEVICE_ID_3M1968) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_3M, USB_DEVICE_ID_3M2256) },
	{ }
	};
	MODULE_DEVICE_TABLE(hid, mmm_devices);

	static const struct hid_usage_id mmm_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 mmm_driver = {
	.name = "3m-pct",
	.id_table = mmm_devices,
	.probe = mmm_probe,
	.remove = mmm_remove,
	.input_mapping = mmm_input_mapping,
	.input_mapped = mmm_input_mapped,
	.usage_table = mmm_grabbed_usages,
	.event = mmm_event,
	};

	static int __init mmm_init(void)
	{
	return hid_register_driver(&mmm_driver);
	}

	static void __exit mmm_exit(void)
	{
	hid_unregister_driver(&mmm_driver);
	}

	module_init(mmm_init);
	module_exit(mmm_exit);