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/drivers/hid/hid-egalax.c

https://gitlab.com/TeamTators/hp-kernel-tenderloin
C | 281 lines | 200 code | 41 blank | 40 comment | 23 complexity | df5d8a6c0633f11d7146fdebeb8f1a26 MD5 | raw file
  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 <linux/slab.h>
 20#include "usbhid/usbhid.h"
 21
 22MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
 23MODULE_DESCRIPTION("eGalax dual-touch panel");
 24MODULE_LICENSE("GPL");
 25
 26#include "hid-ids.h"
 27
 28struct egalax_data {
 29	__u16 x, y, z;
 30	__u8 id;
 31	bool first;		/* is this the first finger in the frame? */
 32	bool valid;		/* valid finger data, or just placeholder? */
 33	bool activity;		/* at least one active finger previously? */
 34	__u16 lastx, lasty;	/* latest valid (x, y) in the frame */
 35};
 36
 37static int egalax_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 38		struct hid_field *field, struct hid_usage *usage,
 39		unsigned long **bit, int *max)
 40{
 41	switch (usage->hid & HID_USAGE_PAGE) {
 42
 43	case HID_UP_GENDESK:
 44		switch (usage->hid) {
 45		case HID_GD_X:
 46			hid_map_usage(hi, usage, bit, max,
 47					EV_ABS, ABS_MT_POSITION_X);
 48			/* touchscreen emulation */
 49			input_set_abs_params(hi->input, ABS_X,
 50						field->logical_minimum,
 51						field->logical_maximum, 0, 0);
 52			return 1;
 53		case HID_GD_Y:
 54			hid_map_usage(hi, usage, bit, max,
 55					EV_ABS, ABS_MT_POSITION_Y);
 56			/* touchscreen emulation */
 57			input_set_abs_params(hi->input, ABS_Y,
 58						field->logical_minimum,
 59						field->logical_maximum, 0, 0);
 60			return 1;
 61		}
 62		return 0;
 63
 64	case HID_UP_DIGITIZER:
 65		switch (usage->hid) {
 66		case HID_DG_TIPSWITCH:
 67			/* touchscreen emulation */
 68			hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
 69			return 1;
 70		case HID_DG_INRANGE:
 71		case HID_DG_CONFIDENCE:
 72		case HID_DG_CONTACTCOUNT:
 73		case HID_DG_CONTACTMAX:
 74			return -1;
 75		case HID_DG_CONTACTID:
 76			hid_map_usage(hi, usage, bit, max,
 77					EV_ABS, ABS_MT_TRACKING_ID);
 78			return 1;
 79		case HID_DG_TIPPRESSURE:
 80			hid_map_usage(hi, usage, bit, max,
 81					EV_ABS, ABS_MT_PRESSURE);
 82			return 1;
 83		}
 84		return 0;
 85	}
 86
 87	/* ignore others (from other reports we won't get anyway) */
 88	return -1;
 89}
 90
 91static int egalax_input_mapped(struct hid_device *hdev, struct hid_input *hi,
 92		struct hid_field *field, struct hid_usage *usage,
 93		unsigned long **bit, int *max)
 94{
 95	if (usage->type == EV_KEY || usage->type == EV_ABS)
 96		clear_bit(usage->code, *bit);
 97
 98	return 0;
 99}
100
101/*
102 * this function is called when a whole finger has been parsed,
103 * so that it can decide what to send to the input layer.
104 */
105static void egalax_filter_event(struct egalax_data *td, struct input_dev *input)
106{
107	td->first = !td->first; /* touchscreen emulation */
108
109	if (td->valid) {
110		/* emit multitouch events */
111		input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id);
112		input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x);
113		input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y);
114		input_event(input, EV_ABS, ABS_MT_PRESSURE, td->z);
115
116		input_mt_sync(input);
117
118		/*
119		 * touchscreen emulation: store (x, y) as
120		 * the last valid values in this frame
121		 */
122		td->lastx = td->x;
123		td->lasty = td->y;
124	}
125
126	/*
127	 * touchscreen emulation: if this is the second finger and at least
128	 * one in this frame is valid, the latest valid in the frame is
129	 * the oldest on the panel, the one we want for single touch
130	 */
131	if (!td->first && td->activity) {
132		input_event(input, EV_ABS, ABS_X, td->lastx);
133		input_event(input, EV_ABS, ABS_Y, td->lasty);
134	}
135
136	if (!td->valid) {
137		/*
138		 * touchscreen emulation: if the first finger is invalid
139		 * and there previously was finger activity, this is a release
140		 */ 
141		if (td->first && td->activity) {
142			input_event(input, EV_KEY, BTN_TOUCH, 0);
143			td->activity = false;
144		}
145		return;
146	}
147
148
149	/* touchscreen emulation: if no previous activity, emit touch event */
150	if (!td->activity) {
151		input_event(input, EV_KEY, BTN_TOUCH, 1);
152		td->activity = true;
153	}
154}
155
156
157static int egalax_event(struct hid_device *hid, struct hid_field *field,
158				struct hid_usage *usage, __s32 value)
159{
160	struct egalax_data *td = hid_get_drvdata(hid);
161
162	if (hid->claimed & HID_CLAIMED_INPUT) {
163		struct input_dev *input = field->hidinput->input;
164
165		switch (usage->hid) {
166		case HID_DG_INRANGE:
167		case HID_DG_CONFIDENCE:
168			/* avoid interference from generic hidinput handling */
169			break;
170		case HID_DG_TIPSWITCH:
171			td->valid = value;
172			break;
173		case HID_DG_TIPPRESSURE:
174			td->z = value;
175			break;
176		case HID_DG_CONTACTID:
177			td->id = value;
178			break;
179		case HID_GD_X:
180			td->x = value;
181			break;
182		case HID_GD_Y:
183			td->y = value;
184			/* this is the last field in a finger */
185			egalax_filter_event(td, input);
186			break;
187		case HID_DG_CONTACTCOUNT:
188			/* touch emulation: this is the last field in a frame */
189			td->first = false;
190			break;
191
192		default:
193			/* fallback to the generic hidinput handling */
194			return 0;
195		}
196	}
197
198	/* we have handled the hidinput part, now remains hiddev */
199	if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
200		hid->hiddev_hid_event(hid, field, usage, value);
201
202	return 1;
203}
204
205static int egalax_probe(struct hid_device *hdev, const struct hid_device_id *id)
206{
207	int ret;
208	struct egalax_data *td;
209	struct hid_report *report;
210
211	td = kmalloc(sizeof(struct egalax_data), GFP_KERNEL);
212	if (!td) {
213		dev_err(&hdev->dev, "cannot allocate eGalax data\n");
214		return -ENOMEM;
215	}
216	hid_set_drvdata(hdev, td);
217
218	ret = hid_parse(hdev);
219	if (ret)
220		goto end;
221
222	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
223	if (ret)
224		goto end;
225
226	report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[5]; 
227	if (report) {
228		report->field[0]->value[0] = 2;
229		usbhid_submit_report(hdev, report, USB_DIR_OUT);
230	}
231
232end:
233	if (ret)
234		kfree(td);
235
236	return ret;
237}
238
239static void egalax_remove(struct hid_device *hdev)
240{
241	hid_hw_stop(hdev);
242	kfree(hid_get_drvdata(hdev));
243	hid_set_drvdata(hdev, NULL);
244}
245
246static const struct hid_device_id egalax_devices[] = {
247	{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
248			USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) },
249	{ }
250};
251MODULE_DEVICE_TABLE(hid, egalax_devices);
252
253static const struct hid_usage_id egalax_grabbed_usages[] = {
254	{ HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
255	{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
256};
257
258static struct hid_driver egalax_driver = {
259	.name = "egalax-touch",
260	.id_table = egalax_devices,
261	.probe = egalax_probe,
262	.remove = egalax_remove,
263	.input_mapping = egalax_input_mapping,
264	.input_mapped = egalax_input_mapped,
265	.usage_table = egalax_grabbed_usages,
266	.event = egalax_event,
267};
268
269static int __init egalax_init(void)
270{
271	return hid_register_driver(&egalax_driver);
272}
273
274static void __exit egalax_exit(void)
275{
276	hid_unregister_driver(&egalax_driver);
277}
278
279module_init(egalax_init);
280module_exit(egalax_exit);
281