[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / hid / hid-egalax.c

/*
 *  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);
Commit	Line	Data
0c3910c2 SC	1	/*
	2	* HID driver for eGalax dual-touch panels
	3	*
	4	* Copyright (c) 2010 Stephane Chatty <chatty@enac.fr>
	5	*
	6	*/
	7
	8	/*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the Free
	11	* Software Foundation; either version 2 of the License, or (at your option)
	12	* any later version.
	13	*/
	14
	15	#include <linux/device.h>
	16	#include <linux/hid.h>
	17	#include <linux/module.h>
	18	#include <linux/usb.h>
	19	#include "usbhid/usbhid.h"
	20
	21	MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
	22	MODULE_DESCRIPTION("eGalax dual-touch panel");
	23	MODULE_LICENSE("GPL");
	24
	25	#include "hid-ids.h"
	26
	27	struct egalax_data {
	28	__u16 x, y, z;
	29	__u8 id;
	30	bool first; /* is this the first finger in the frame? */
	31	bool valid; /* valid finger data, or just placeholder? */
	32	bool activity; /* at least one active finger previously? */
	33	__u16 lastx, lasty; /* latest valid (x, y) in the frame */
	34	};
	35
	36	static int egalax_input_mapping(struct hid_device hdev, struct hid_input hi,
	37	struct hid_field field, struct hid_usage usage,
	38	unsigned long *bit, int max)
	39	{
	40	switch (usage->hid & HID_USAGE_PAGE) {
	41
	42	case HID_UP_GENDESK:
	43	switch (usage->hid) {
	44	case HID_GD_X:
	45	hid_map_usage(hi, usage, bit, max,
	46	EV_ABS, ABS_MT_POSITION_X);
	47	/* touchscreen emulation */
	48	input_set_abs_params(hi->input, ABS_X,
	49	field->logical_minimum,
	50	field->logical_maximum, 0, 0);
	51	return 1;
	52	case HID_GD_Y:
	53	hid_map_usage(hi, usage, bit, max,
	54	EV_ABS, ABS_MT_POSITION_Y);
	55	/* touchscreen emulation */
	56	input_set_abs_params(hi->input, ABS_Y,
	57	field->logical_minimum,
	58	field->logical_maximum, 0, 0);
	59	return 1;
	60	}
	61	return 0;
	62
	63	case HID_UP_DIGITIZER:
	64	switch (usage->hid) {
65	case HID_DG_TIPSWITCH:
66	/* touchscreen emulation */
67	hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
68	return 1;
69	case HID_DG_INRANGE:
70	case HID_DG_CONFIDENCE:
71	case HID_DG_CONTACTCOUNT:
72	case HID_DG_CONTACTMAX:
73	return -1;
74	case HID_DG_CONTACTID:
75	hid_map_usage(hi, usage, bit, max,
76	EV_ABS, ABS_MT_TRACKING_ID);
77	return 1;
78	case HID_DG_TIPPRESSURE:
79	hid_map_usage(hi, usage, bit, max,
80	EV_ABS, ABS_MT_PRESSURE);
81	return 1;
82	}
83	return 0;
84	}
85
86	/* ignore others (from other reports we won't get anyway) */
87	return -1;
88	}
89
90	static int egalax_input_mapped(struct hid_device hdev, struct hid_input hi,
91	struct hid_field field, struct hid_usage usage,
92	unsigned long *bit, int max)
93	{
94	if (usage->type == EV_KEY \|\| usage->type == EV_ABS)
95	clear_bit(usage->code, *bit);
96
97	return 0;
98	}
99
100	/*
101	* this function is called when a whole finger has been parsed,
102	* so that it can decide what to send to the input layer.
103	*/
104	static void egalax_filter_event(struct egalax_data td, struct input_dev input)
105	{
106	td->first = !td->first; /* touchscreen emulation */
107
108	if (td->valid) {
109	/* emit multitouch events */
110	input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id);
111	input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x);
112	input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y);
113	input_event(input, EV_ABS, ABS_MT_PRESSURE, td->z);
114
115	input_mt_sync(input);
116
117	/*
118	* touchscreen emulation: store (x, y) as
119	* the last valid values in this frame
120	*/
121	td->lastx = td->x;
122	td->lasty = td->y;
123	}
124
125	/*
126	* touchscreen emulation: if this is the second finger and at least
127	* one in this frame is valid, the latest valid in the frame is
128	* the oldest on the panel, the one we want for single touch
129	*/
130	if (!td->first && td->activity) {
131	input_event(input, EV_ABS, ABS_X, td->lastx);
132	input_event(input, EV_ABS, ABS_Y, td->lasty);
133	}
134
135	if (!td->valid) {
136	/*
137	* touchscreen emulation: if the first finger is invalid
138	* and there previously was finger activity, this is a release
139	*/
140	if (td->first && td->activity) {
141	input_event(input, EV_KEY, BTN_TOUCH, 0);
142	td->activity = false;
143	}
144	return;
145	}
146
147
148	/* touchscreen emulation: if no previous activity, emit touch event */
149	if (!td->activity) {
150	input_event(input, EV_KEY, BTN_TOUCH, 1);
151	td->activity = true;
152	}
153	}
154
155
156	static int egalax_event(struct hid_device hid, struct hid_field field,
157	struct hid_usage *usage, __s32 value)
158	{
159	struct egalax_data *td = hid_get_drvdata(hid);
160
161	if (hid->claimed & HID_CLAIMED_INPUT) {
162	struct input_dev *input = field->hidinput->input;
163
164	switch (usage->hid) {
165	case HID_DG_INRANGE:
166	case HID_DG_CONFIDENCE:
167	/* avoid interference from generic hidinput handling */
168	break;
169	case HID_DG_TIPSWITCH:
170	td->valid = value;
171	break;
172	case HID_DG_TIPPRESSURE:
173	td->z = value;
174	break;
175	case HID_DG_CONTACTID:
176	td->id = value;
177	break;
178	case HID_GD_X:
179	td->x = value;
180	break;
181	case HID_GD_Y:
182	td->y = value;
183	/* this is the last field in a finger */
184	egalax_filter_event(td, input);
185	break;
186	case HID_DG_CONTACTCOUNT:
187	/* touch emulation: this is the last field in a frame */
188	td->first = false;
189	break;
190
191	default:
192	/* fallback to the generic hidinput handling */
193	return 0;
194	}
195	}
196
197	/* we have handled the hidinput part, now remains hiddev */
198	if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
199	hid->hiddev_hid_event(hid, field, usage, value);
200
201	return 1;
202	}
203
204	static int egalax_probe(struct hid_device hdev, const struct hid_device_id id)
205	{
206	int ret;
207	struct egalax_data *td;
208	struct hid_report *report;
209
210	td = kmalloc(sizeof(struct egalax_data), GFP_KERNEL);
211	if (!td) {
212	dev_err(&hdev->dev, "cannot allocate eGalax data\n");
213	return -ENOMEM;
214	}
215	hid_set_drvdata(hdev, td);
216
217	ret = hid_parse(hdev);
218	if (ret)
219	goto end;
220
221	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
222	if (ret)
223	goto end;
224
225	report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[5];
226	if (report) {
227	report->field[0]->value[0] = 2;
228	usbhid_submit_report(hdev, report, USB_DIR_OUT);
229	}
230
231	end:
232	if (ret)
233	kfree(td);
234
235	return ret;
236	}
237
238	static void egalax_remove(struct hid_device *hdev)
239	{
240	hid_hw_stop(hdev);
241	kfree(hid_get_drvdata(hdev));
242	hid_set_drvdata(hdev, NULL);
243	}
244
245	static const struct hid_device_id egalax_devices[] = {
246	{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
247	USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) },
248	{ }
249	};
250	MODULE_DEVICE_TABLE(hid, egalax_devices);
251
252	static const struct hid_usage_id egalax_grabbed_usages[] = {
253	{ HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
254	{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
255	};
256
257	static struct hid_driver egalax_driver = {
258	.name = "egalax-touch",
259	.id_table = egalax_devices,
260	.probe = egalax_probe,
261	.remove = egalax_remove,
262	.input_mapping = egalax_input_mapping,
263	.input_mapped = egalax_input_mapped,
264	.usage_table = egalax_grabbed_usages,
265	.event = egalax_event,
266	};
267
268	static int __init egalax_init(void)
269	{
270	return hid_register_driver(&egalax_driver);
271	}
272
273	static void __exit egalax_exit(void)
274	{
275	hid_unregister_driver(&egalax_driver);
276	}
277
278	module_init(egalax_init);
279	module_exit(egalax_exit);
280