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
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
|
/*
* Pegasus Mobile Notetaker Pen input tablet driver
*
* Copyright (c) 2016 Martin Kepplinger <martink@posteo.de>
*/
/*
* request packet (control endpoint):
* |-------------------------------------|
* | Report ID | Nr of bytes | command |
* | (1 byte) | (1 byte) | (n bytes) |
* |-------------------------------------|
* | 0x02 | n | |
* |-------------------------------------|
*
* data packet after set xy mode command, 0x80 0xb5 0x02 0x01
* and pen is in range:
*
* byte byte name value (bits)
* --------------------------------------------
* 0 status 0 1 0 0 0 0 X X
* 1 color 0 0 0 0 H 0 S T
* 2 X low
* 3 X high
* 4 Y low
* 5 Y high
*
* X X battery state:
* no state reported 0x00
* battery low 0x01
* battery good 0x02
*
* H Hovering
* S Switch 1 (pen button)
* T Tip
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/usb/input.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
/* USB HID defines */
#define USB_REQ_GET_REPORT 0x01
#define USB_REQ_SET_REPORT 0x09
#define USB_VENDOR_ID_PEGASUSTECH 0x0e20
#define USB_DEVICE_ID_PEGASUS_NOTETAKER_EN100 0x0101
/* device specific defines */
#define NOTETAKER_REPORT_ID 0x02
#define NOTETAKER_SET_CMD 0x80
#define NOTETAKER_SET_MODE 0xb5
#define NOTETAKER_LED_MOUSE 0x02
#define PEN_MODE_XY 0x01
#define SPECIAL_COMMAND 0x80
#define BUTTON_PRESSED 0xb5
#define COMMAND_VERSION 0xa9
/* in xy data packet */
#define BATTERY_NO_REPORT 0x40
#define BATTERY_LOW 0x41
#define BATTERY_GOOD 0x42
#define PEN_BUTTON_PRESSED BIT(1)
#define PEN_TIP BIT(0)
struct pegasus {
unsigned char *data;
u8 data_len;
dma_addr_t data_dma;
struct input_dev *dev;
struct usb_device *usbdev;
struct usb_interface *intf;
struct urb *irq;
char name[128];
char phys[64];
struct work_struct init;
};
static int pegasus_control_msg(struct pegasus *pegasus, u8 *data, int len)
{
const int sizeof_buf = len + 2;
int result;
int error;
u8 *cmd_buf;
cmd_buf = kmalloc(sizeof_buf, GFP_KERNEL);
if (!cmd_buf)
return -ENOMEM;
cmd_buf[0] = NOTETAKER_REPORT_ID;
cmd_buf[1] = len;
memcpy(cmd_buf + 2, data, len);
result = usb_control_msg(pegasus->usbdev,
usb_sndctrlpipe(pegasus->usbdev, 0),
USB_REQ_SET_REPORT,
USB_TYPE_VENDOR | USB_DIR_OUT,
0, 0, cmd_buf, sizeof_buf,
USB_CTRL_SET_TIMEOUT);
kfree(cmd_buf);
if (unlikely(result != sizeof_buf)) {
error = result < 0 ? result : -EIO;
dev_err(&pegasus->usbdev->dev, "control msg error: %d\n",
error);
return error;
}
return 0;
}
static int pegasus_set_mode(struct pegasus *pegasus, u8 mode, u8 led)
{
u8 cmd[] = { NOTETAKER_SET_CMD, NOTETAKER_SET_MODE, led, mode };
return pegasus_control_msg(pegasus, cmd, sizeof(cmd));
}
static void pegasus_parse_packet(struct pegasus *pegasus)
{
unsigned char *data = pegasus->data;
struct input_dev *dev = pegasus->dev;
u16 x, y;
switch (data[0]) {
case SPECIAL_COMMAND:
/* device button pressed */
if (data[1] == BUTTON_PRESSED)
schedule_work(&pegasus->init);
break;
/* xy data */
case BATTERY_LOW:
dev_warn_once(&dev->dev, "Pen battery low\n");
/* fall through */
case BATTERY_NO_REPORT:
case BATTERY_GOOD:
x = le16_to_cpup((__le16 *)&data[2]);
y = le16_to_cpup((__le16 *)&data[4]);
/* pen-up event */
if (x == 0 && y == 0)
break;
input_report_key(dev, BTN_TOUCH, data[1] & PEN_TIP);
input_report_key(dev, BTN_RIGHT, data[1] & PEN_BUTTON_PRESSED);
input_report_key(dev, BTN_TOOL_PEN, 1);
input_report_abs(dev, ABS_X, (s16)x);
input_report_abs(dev, ABS_Y, y);
input_sync(dev);
break;
default:
dev_warn_once(&pegasus->usbdev->dev,
"unknown answer from device\n");
}
}
static void pegasus_irq(struct urb *urb)
{
struct pegasus *pegasus = urb->context;
struct usb_device *dev = pegasus->usbdev;
int retval;
switch (urb->status) {
case 0:
pegasus_parse_packet(pegasus);
usb_mark_last_busy(pegasus->usbdev);
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
dev_err(&dev->dev, "%s - urb shutting down with status: %d",
__func__, urb->status);
return;
default:
dev_err(&dev->dev, "%s - nonzero urb status received: %d",
__func__, urb->status);
break;
}
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval)
dev_err(&dev->dev, "%s - usb_submit_urb failed with result %d",
__func__, retval);
}
static void pegasus_init(struct work_struct *work)
{
struct pegasus *pegasus = container_of(work, struct pegasus, init);
int error;
error = pegasus_set_mode(pegasus, PEN_MODE_XY, NOTETAKER_LED_MOUSE);
if (error)
dev_err(&pegasus->usbdev->dev, "pegasus_set_mode error: %d\n",
error);
}
static int pegasus_open(struct input_dev *dev)
{
struct pegasus *pegasus = input_get_drvdata(dev);
int error;
error = usb_autopm_get_interface(pegasus->intf);
if (error)
return error;
pegasus->irq->dev = pegasus->usbdev;
if (usb_submit_urb(pegasus->irq, GFP_KERNEL)) {
error = -EIO;
goto err_autopm_put;
}
error = pegasus_set_mode(pegasus, PEN_MODE_XY, NOTETAKER_LED_MOUSE);
if (error)
goto err_kill_urb;
return 0;
err_kill_urb:
usb_kill_urb(pegasus->irq);
cancel_work_sync(&pegasus->init);
err_autopm_put:
usb_autopm_put_interface(pegasus->intf);
return error;
}
static void pegasus_close(struct input_dev *dev)
{
struct pegasus *pegasus = input_get_drvdata(dev);
usb_kill_urb(pegasus->irq);
cancel_work_sync(&pegasus->init);
usb_autopm_put_interface(pegasus->intf);
}
static int pegasus_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_device *dev = interface_to_usbdev(intf);
struct usb_endpoint_descriptor *endpoint;
struct pegasus *pegasus;
struct input_dev *input_dev;
int error;
int pipe;
/* We control interface 0 */
if (intf->cur_altsetting->desc.bInterfaceNumber >= 1)
return -ENODEV;
/* Sanity check that the device has an endpoint */
if (intf->altsetting[0].desc.bNumEndpoints < 1) {
dev_err(&intf->dev, "Invalid number of endpoints\n");
return -EINVAL;
}
endpoint = &intf->cur_altsetting->endpoint[0].desc;
pegasus = kzalloc(sizeof(*pegasus), GFP_KERNEL);
input_dev = input_allocate_device();
if (!pegasus || !input_dev) {
error = -ENOMEM;
goto err_free_mem;
}
pegasus->usbdev = dev;
pegasus->dev = input_dev;
pegasus->intf = intf;
pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
pegasus->data_len = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
pegasus->data = usb_alloc_coherent(dev, pegasus->data_len, GFP_KERNEL,
&pegasus->data_dma);
if (!
|