-
Notifications
You must be signed in to change notification settings - Fork 1
/
abs-c.c
351 lines (296 loc) · 9.9 KB
/
abs-c.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
#include <stdio.h>
#include <linux/uinput.h>
#include <stdlib.h>
#include <stdbool.h>
#include <dirent.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <ini.h>
// Flag to control the main loop
volatile sig_atomic_t stop = 0;
int tab_fd;
void quit() {
printf("\nExiting.\n");
stop = 1;
ioctl(tab_fd, UI_DEV_DESTROY);
exit(0);
}
typedef struct
{
int display_width;
int display_height;
float x_scale_pct_min;
float x_scale_pct_max;
float y_scale_pct_min;
float y_scale_pct_max;
int keep_ratio;
int use_pen;
} configuration;
static int handler(void* user, const char* section, const char* name,
const char* value)
{
configuration* pconfig = (configuration*)user;
#define MATCH(s, n) strcmp(section, s) == 0 && strcmp(name, n) == 0
if (MATCH("display", "width")) {
pconfig->display_width = atoi(value);
} else if (MATCH("display", "height")) {
pconfig->display_height = atoi(value);
} else if (MATCH("area", "x_scale_pct_min")) {
pconfig->x_scale_pct_min = atof(value);
} else if (MATCH("area", "x_scale_pct_max")) {
pconfig->x_scale_pct_max = atof(value);
} else if (MATCH("area", "y_scale_pct_min")) {
pconfig->y_scale_pct_min = atof(value);
} else if (MATCH("area", "y_scale_pct_max")) {
pconfig->y_scale_pct_max = atof(value);
} else if (MATCH("area", "keep_ratio")) {
pconfig->keep_ratio = atoi(value);
} else if (MATCH("area", "use_pen")) {
pconfig->use_pen = atoi(value);
} else {
return 0; /* unknown section/name, error */
}
return 1;
}
// Creates the virtual tablet and returns it's file descriptor
int init_uinput(int tmin_x, int tmax_x, int tmin_y, int tmax_y) {
int fd = open("/dev/uinput", O_WRONLY | O_NONBLOCK);
if(fd < 0) {
printf("Failed to access /dev/uinput\n");
exit(EXIT_FAILURE);
}
#define EV_KEY 0x01
#define EV_REL 0x02
#define EV_ABS 0x03
#define UI_SET_PROPBIT _IOW(UINPUT_IOCTL_BASE, 110, int)
ioctl(fd, UI_SET_EVBIT, EV_KEY);
ioctl(fd, UI_SET_EVBIT, EV_SYN);
ioctl(fd, UI_SET_KEYBIT, BTN_LEFT);
//ioctl(fd, UI_SET_KEYBIT, BTN_TOUCH);
ioctl(fd, UI_SET_EVBIT, EV_ABS);
ioctl(fd, UI_SET_ABSBIT, ABS_X);
ioctl(fd, UI_SET_ABSBIT, ABS_Y);
//ioctl(fd, UI_SET_KEYBIT, ABS_PRESSURE);
//ioctl(fd, UI_SET_PROPBIT, INPUT_PROP_DIRECT);
#define UINPUT_MAX_NAME_SIZE 80
struct uinput_user_dev {
char name[UINPUT_MAX_NAME_SIZE];
struct input_id id;
int ff_effects_max;
int absmax[ABS_MAX + 1];
int absmin[ABS_MAX + 1];
int absfuzz[ABS_MAX + 1];
int absflat[ABS_MAX + 1];
};
struct uinput_user_dev uidev;
memset(&uidev, 0, sizeof(uidev));
snprintf(uidev.name, UINPUT_MAX_NAME_SIZE, "Abs-C Virtual Tablet");
uidev.id.bustype = BUS_USB;
uidev.id.vendor = 0x1234;
uidev.id.product = 0xfedc;
uidev.id.version = 1;
uidev.absmin[ABS_X] = tmin_x;
uidev.absmax[ABS_X] = tmax_x + 1;
uidev.absmin[ABS_Y] = tmin_y;
uidev.absmax[ABS_Y] = tmax_y;
write(fd, &uidev, sizeof(uidev));
ioctl(fd, UI_DEV_CREATE);
return fd;
}
int main() {
signal(SIGINT, quit);
signal(SIGTERM, quit);
int display_width;
int display_height;
float x_scale_pct_min;
float x_scale_pct_max;
float y_scale_pct_min;
float y_scale_pct_max;
int keep_ratio;
int use_pen;
configuration config;
// Get user config dir
char config_path[50];
strcpy(config_path, getenv("HOME"));
strcat(config_path, "/.config/abs-c.ini");
printf("Loading config from %s\n", config_path);
// Try to load config from $HOME/.config/
if (ini_parse(config_path, handler, &config) < 0) {
// Use defaults if above fails
display_width = 1366;
display_height = 768;
x_scale_pct_min = 100; // Left edge
x_scale_pct_max = 100; // Right edge
y_scale_pct_min = 100; // Top edge
y_scale_pct_max = 100; // Bottom edge
keep_ratio = 1;
use_pen = 0;
}
// Set variables to config file contents if parsing succeeds
else {
display_width = config.display_width;
display_height = config.display_height;
x_scale_pct_min = config.x_scale_pct_min;
x_scale_pct_max = config.x_scale_pct_max;
y_scale_pct_min = config.y_scale_pct_min;
y_scale_pct_max = config.y_scale_pct_max;
keep_ratio = config.keep_ratio;
use_pen = config.use_pen;
}
// Try to detect touchpad using preset keywords
struct dirent **namelist;
int i, ndevs, fd, found;
char path[32],name[256];
char *pen;
char *tpad1;
char *tpad2;
char *tpad3;
char *tpad4;
bool is_mac;
if (use_pen == 1) {
pen = "Stylus";
}
else {
tpad1 = "Touchpad";
tpad2 = "TouchPad";
tpad3 = "Synaptics";
tpad4 = "bcm5974";
}
ndevs = scandir("/dev/input/", &namelist, NULL, alphasort);
bool is_mouse;
for (i = 0; i < ndevs; i++) {
snprintf(path, sizeof path, "%s%s", "/dev/input/", namelist[i]->d_name);
fd = open(path, O_RDONLY);
ioctl(fd, EVIOCGNAME(sizeof(name)), name);
if(strstr(name, "Mouse") != NULL) {
is_mouse = true;
}
if (is_mouse != true) {
if (use_pen == 1) {
if (strstr(name,pen) != NULL){found = 1; break;}
}
// Check for keyword match
else if (found != 1 &
strstr(name,tpad1) != NULL |
strstr(name,tpad2) != NULL |
strstr(name,tpad3) != NULL |
strstr(name,tpad4) != NULL){found = 1; break;}
}
is_mouse = false;
}
// Ensure touchpad mode is active
if (use_pen != 1) {
// Check if the touchpad uses the bcm5974 chip (Apple)
if (strstr(name,tpad4) != NULL) {
is_mac = true;
}
else {
is_mac = false;
}
}
// Exit if no touchpad is detected
if (found != 1){printf("Device not found, exiting...\n"); exit(0);};
// Get min and max touchpad values
int abs[1];
ioctl(fd, EVIOCGABS(ABS_X), abs);
int tmin_x = abs[1];
int tmax_x = abs[2];
ioctl(fd, EVIOCGABS(ABS_Y), abs);
int tmin_y = abs[1];
int tmax_y = abs[2];
// Fix area if using a Mac Touchpad (bcm5974)
if (is_mac == true) {
tmin_y = tmin_y + 1350;
}
// Calculate screen and touchpad aspect ratios
double sr, tr, xo, yo;
sr = (float)display_width / (float)display_height;
tr = (float)tmax_x / (float)tmax_y;
// Compensate for screen/touchpad ratio difference and center the active area
// This is to ensure there is no stretching of the area
// Equivalent to "Keep aspect ratio" setting on monitors
if (keep_ratio == 1) {
if (sr < tr) {
// Calculate X offset
xo = tmax_x * sr / 16;
// Apply Offset
tmin_x = tmin_x + xo;
tmax_x = tmax_x - xo;
}
else {
//Calculate Y offset
yo = tmax_y * sr / 16;
//Apply Offset
tmin_y = tmin_y + yo;
tmax_y = tmax_y - yo;
}
}
// Apply custom area
float x_scale_min = x_scale_pct_min * 0.01;
float x_scale_max = x_scale_pct_max * 0.01;
float y_scale_min = y_scale_pct_min * 0.01;
float y_scale_max = y_scale_pct_max * 0.01;
int new_tmin_x = tmax_x - (x_scale_min * (tmax_x - tmin_x));
int new_tmax_x = tmin_x + (x_scale_max * (tmax_x - tmin_x));
int new_tmin_y = tmax_y - (y_scale_min * (tmax_y - tmin_y));
int new_tmax_y = tmin_y + (y_scale_max * (tmax_y - tmin_y));
// Grab device
// Comment this out to enable your touchpad's gestures/buttons
ioctl(fd, EVIOCGRAB, 1);
// Init update indicator
bool update = false;
printf("Press Ctrl-C to quit\n");
// Init virtual tablet
tab_fd = init_uinput(new_tmin_x, new_tmax_x, new_tmin_y, new_tmax_y);
struct input_event tab_ev[2];
memset(tab_ev, 0, sizeof(tab_ev));
// Init axis/event values and start main loop
int x,y,x_old,y_old;
struct input_event ev;
while(!stop) {
// Read event from touchpad
read(fd,&ev, sizeof(ev));
// Set values according to event codes
if(ev.code == ABS_X) {x = ev.value;}
if(ev.code == ABS_Y) {y = ev.value;}
// Only update position if value has changed
if(x != y_old && y != 0) {
//memset(tab_ev, 0, sizeof(tab_ev));
tab_ev[0].type = EV_ABS;
tab_ev[0].code = ABS_Y;
tab_ev[0].value = y;
write(tab_fd, tab_ev, sizeof(tab_ev));
update = true;
}
// Only update position if value has changed
// "x != 0" is used to prevent cursor from flickering to left edge
if(y != x_old && x != 0) {
//memset(tab_ev, 0, sizeof(tab_ev));
tab_ev[1].type = EV_ABS;
tab_ev[1].code = ABS_X;
tab_ev[1].value = x;
write(tab_fd, tab_ev, sizeof(tab_ev));
update = true;
}
// Only sync if needed
if (update == true) {
//memset(tab_ev, 0, sizeof(tab_ev));
tab_ev[0].type = EV_SYN;
tab_ev[0].code = SYN_REPORT;
tab_ev[0].value = 0;
//write(tab_fd, tab_ev, sizeof(tab_ev));
//memset(tab_ev, 0, sizeof(tab_ev));
tab_ev[1].type = EV_SYN;
tab_ev[1].code = SYN_REPORT;
tab_ev[1].value = 0;
//write(tab_fd, tab_ev, sizeof(tab_ev));
// Reset update indicator
update = false;
}
// Set old vars (for next iteration of the loop)
x_old = x;
y_old = y;
}
}