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added 2.6.29.6 aldebaran kernel
[nao-ulib.git] / kernel / 2.6.29.6-aldebaran-rt / drivers / staging / asus_oled / asus_oled.c
blob666a186e212b1de1c1f2fb8b64df15ffdac0cc81
1 /*
2 * Asus OLED USB driver
3 *
4 * Copyright (C) 2007,2008 Jakub Schmidtke (sjakub@gmail.com)
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 *
22 *
23 * This module is based on usbled and asus-laptop modules.
24 *
25 *
26 * Asus OLED support is based on asusoled program taken from
27 * https://launchpad.net/asusoled/.
28 *
29 *
30 */
31
32 #include <linux/kernel.h>
33 #include <linux/errno.h>
34 #include <linux/init.h>
35 #include <linux/slab.h>
36 #include <linux/module.h>
37 #include <linux/usb.h>
38 #include <linux/platform_device.h>
39 #include <linux/ctype.h>
40
41 #define ASUS_OLED_VERSION "0.04-dev"
42 #define ASUS_OLED_NAME "asus-oled"
43 #define ASUS_OLED_UNDERSCORE_NAME "asus_oled"
44
45 #define ASUS_OLED_ERROR "Asus OLED Display Error: "
46
47 #define ASUS_OLED_STATIC 's'
48 #define ASUS_OLED_ROLL 'r'
49 #define ASUS_OLED_FLASH 'f'
50
51 #define ASUS_OLED_MAX_WIDTH 1792
52 #define ASUS_OLED_DISP_HEIGHT 32
53 #define ASUS_OLED_PACKET_BUF_SIZE 256
54
55 MODULE_AUTHOR("Jakub Schmidtke, sjakub@gmail.com");
56 MODULE_DESCRIPTION("Asus OLED Driver v" ASUS_OLED_VERSION);
57 MODULE_LICENSE("GPL");
58
59 static struct class *oled_class = 0;
60 static int oled_num = 0;
61
62 static uint start_off = 0;
63
64 module_param(start_off, uint, 0644);
65
66 MODULE_PARM_DESC(start_off, "Set to 1 to switch off OLED display after it is attached");
67
68 typedef enum {
69 PACK_MODE_G1,
70 PACK_MODE_G50,
71 PACK_MODE_LAST
72 } oled_pack_mode_t;
73
74 struct oled_dev_desc_str {
75 uint16_t idVendor;
76 uint16_t idProduct;
77 uint16_t devWidth; // width of display
78 oled_pack_mode_t packMode; // formula to be used while packing the picture
79 const char *devDesc;
80 };
81
82 /* table of devices that work with this driver */
83 static struct usb_device_id id_table [] = {
84 { USB_DEVICE(0x0b05, 0x1726) }, // Asus G1/G2 (and variants)
85 { USB_DEVICE(0x0b05, 0x175b) }, // Asus G50V (and possibly others - G70? G71?)
86 { },
87 };
88
89 /* parameters of specific devices */
90 static struct oled_dev_desc_str oled_dev_desc_table [] = {
91 { 0x0b05, 0x1726, 128, PACK_MODE_G1, "G1/G2" },
92 { 0x0b05, 0x175b, 256, PACK_MODE_G50, "G50" },
93 { },
94 };
95
96 MODULE_DEVICE_TABLE (usb, id_table);
97
98 #define SETUP_PACKET_HEADER(packet, val1, val2, val3, val4, val5, val6, val7) \
99 do { \
100 memset(packet, 0, sizeof(struct asus_oled_header)); \
101 packet->header.magic1 = 0x55; \
102 packet->header.magic2 = 0xaa; \
103 packet->header.flags = val1; \
104 packet->header.value3 = val2; \
105 packet->header.buffer1 = val3; \
106 packet->header.buffer2 = val4; \
107 packet->header.value6 = val5; \
108 packet->header.value7 = val6; \
109 packet->header.value8 = val7; \
110 } while(0);
111
112 struct asus_oled_header {
113 uint8_t magic1;
114 uint8_t magic2;
115 uint8_t flags;
116 uint8_t value3;
117 uint8_t buffer1;
118 uint8_t buffer2;
119 uint8_t value6;
120 uint8_t value7;
121 uint8_t value8;
122 uint8_t padding2[7];
123 } __attribute((packed));
124
125 struct asus_oled_packet {
126 struct asus_oled_header header;
127 uint8_t bitmap[ASUS_OLED_PACKET_BUF_SIZE];
128 } __attribute((packed));
129
130 struct asus_oled_dev {
131 struct usb_device * udev;
132 uint8_t pic_mode;
133 uint16_t dev_width;
134 oled_pack_mode_t pack_mode;
135 size_t height;
136 size_t width;
137 size_t x_shift;
138 size_t y_shift;
139 size_t buf_offs;
140 uint8_t last_val;
141 size_t buf_size;
142 char *buf;
143 uint8_t enabled;
144 struct device *dev;
145 };
146
147 static void enable_oled(struct asus_oled_dev *odev, uint8_t enabl)
148 {
149 int a;
150 int retval;
151 int act_len;
152 struct asus_oled_packet * packet;
153
154 packet = kzalloc(sizeof(struct asus_oled_packet), GFP_KERNEL);
155
156 if (!packet) {
157 dev_err(&odev->udev->dev, "out of memory\n");
158 return;
159 }
160
161 SETUP_PACKET_HEADER(packet, 0x20, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00);
162
163 if (enabl) packet->bitmap[0] = 0xaf;
164 else packet->bitmap[0] = 0xae;
165
166 for (a=0; a<1; a++) {
167 retval = usb_bulk_msg(odev->udev,
168 usb_sndbulkpipe(odev->udev, 2),
169 packet,
170 sizeof(struct asus_oled_header) + 1,
171 &act_len,
172 -1);
173
174 if (retval)
175 dev_dbg(&odev->udev->dev, "retval = %d\n", retval);
176 }
177
178 odev->enabled = enabl;
179
180 kfree(packet);
181 }
182
183 static ssize_t set_enabled(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
184 {
185 struct usb_interface *intf = to_usb_interface(dev);
186 struct asus_oled_dev *odev = usb_get_intfdata(intf);
187 int temp = simple_strtoul(buf, NULL, 10);
188
189 enable_oled(odev, temp);
190
191 return count;
192 }
193
194 static ssize_t class_set_enabled(struct device *device, struct device_attribute *attr, const char *buf, size_t count)
195 {
196 struct asus_oled_dev *odev = (struct asus_oled_dev *) dev_get_drvdata(device);
197
198 int temp = simple_strtoul(buf, NULL, 10);
199
200 enable_oled(odev, temp);
201
202 return count;
203 }
204
205 static ssize_t get_enabled(struct device *dev, struct device_attribute *attr, char *buf)
206 {
207 struct usb_interface *intf = to_usb_interface(dev);
208 struct asus_oled_dev *odev = usb_get_intfdata(intf);
209
210 return sprintf(buf, "%d\n", odev->enabled);
211 }
212
213 static ssize_t class_get_enabled(struct device *device, struct device_attribute *attr, char *buf)
214 {
215 struct asus_oled_dev *odev = (struct asus_oled_dev *) dev_get_drvdata(device);
216
217 return sprintf(buf, "%d\n", odev->enabled);
218 }
219
220 static void send_packets(struct usb_device *udev, struct asus_oled_packet *packet,
221 char *buf, uint8_t p_type, size_t p_num)
222 {
223 size_t i;
224 int act_len;
225
226 for (i = 0; i < p_num; i++) {
227 int retval;
228
229 switch (p_type) {
230 case ASUS_OLED_ROLL:
231 SETUP_PACKET_HEADER(packet, 0x40, 0x80, p_num, i + 1, 0x00, 0x01, 0xff);
232 break;
233 case ASUS_OLED_STATIC:
234 SETUP_PACKET_HEADER(packet, 0x10 + i, 0x80, 0x01, 0x01, 0x00, 0x01, 0x00);
235 break;
236 case ASUS_OLED_FLASH:
237 SETUP_PACKET_HEADER(packet, 0x10 + i, 0x80, 0x01, 0x01, 0x00, 0x00, 0xff);
238 break;
239 }
240
241 memcpy(packet->bitmap, buf + (ASUS_OLED_PACKET_BUF_SIZE*i), ASUS_OLED_PACKET_BUF_SIZE);
242
243 retval = usb_bulk_msg(udev,
244 usb_sndctrlpipe(udev, 2),
245 packet,
246 sizeof(struct asus_oled_packet),
247 &act_len,
248 -1);
249
250 if (retval)
251 dev_dbg(&udev->dev, "retval = %d\n", retval);
252 }
253 }
254
255 static void send_packet(struct usb_device *udev, struct asus_oled_packet *packet, size_t offset, size_t len, char *buf, uint8_t b1, uint8_t b2, uint8_t b3, uint8_t b4, uint8_t b5, uint8_t b6){
256 int retval;
257 int act_len;
258
259 SETUP_PACKET_HEADER(packet, b1, b2, b3, b4, b5, b6, 0x00);
260 memcpy(packet->bitmap, buf + offset, len);
261
262 retval = usb_bulk_msg(udev,
263 usb_sndctrlpipe(udev, 2),
264 packet,
265 sizeof(struct asus_oled_packet),
266 &act_len,
267 -1);
268
269 if (retval)
270 dev_dbg(&udev->dev, "retval = %d\n", retval);
271 }
272
273
274 static void send_packets_g50(struct usb_device *udev, struct asus_oled_packet *packet, char *buf)
275 {
276 send_packet(udev, packet, 0, 0x100, buf, 0x10, 0x00, 0x02, 0x01, 0x00, 0x01);
277 send_packet(udev, packet, 0x100, 0x080, buf, 0x10, 0x00, 0x02, 0x02, 0x80, 0x00);
278
279 send_packet(udev, packet, 0x180, 0x100, buf, 0x11, 0x00, 0x03, 0x01, 0x00, 0x01);
280 send_packet(udev, packet, 0x280, 0x100, buf, 0x11, 0x00, 0x03, 0x02, 0x00, 0x01);
281 send_packet(udev, packet, 0x380, 0x080, buf, 0x11, 0x00, 0x03, 0x03, 0x80, 0x00);
282 }
283
284
285 static void send_data(struct asus_oled_dev *odev)
286 {
287 size_t packet_num = odev->buf_size / ASUS_OLED_PACKET_BUF_SIZE;
288 struct asus_oled_packet * packet;
289
290 packet = kzalloc(sizeof(struct asus_oled_packet), GFP_KERNEL);
291
292 if (!packet) {
293 dev_err(&odev->udev->dev, "out of memory\n");
294 return;
295 }
296
297 if (odev->pack_mode==PACK_MODE_G1){
298 // When sending roll-mode data the display updated only first packet.
299 // I have no idea why, but when static picture is send just before
300 // rolling picture - everything works fine.
301 if (odev->pic_mode == ASUS_OLED_ROLL)
302 send_packets(odev->udev, packet, odev->buf, ASUS_OLED_STATIC, 2);
303
304 // Only ROLL mode can use more than 2 packets.
305 if (odev->pic_mode != ASUS_OLED_ROLL && packet_num > 2)
306 packet_num = 2;
307
308 send_packets(odev->udev, packet, odev->buf, odev->pic_mode, packet_num);
309 }
310 else
311 if (odev->pack_mode==PACK_MODE_G50){
312 send_packets_g50(odev->udev, packet, odev->buf);
313 }
314
315 kfree(packet);
316 }
317
318 static int append_values(struct asus_oled_dev *odev, uint8_t val, size_t count)
319 {
320 while (count-- > 0) {
321 if (val) {
322 size_t x = odev->buf_offs % odev->width;
323 size_t y = odev->buf_offs / odev->width;
324 size_t i;
325
326 x += odev->x_shift;
327 y += odev->y_shift;
328
329 switch(odev->pack_mode)
330 {
331 case PACK_MODE_G1:
332 // i = (x/128)*640 + 127 - x + (y/8)*128;
333 // This one for 128 is the same, but might be better for different widths?
334 i = (x/odev->dev_width)*640 + odev->dev_width - 1 - x + (y/8)*odev->dev_width;
335 break;
336
337 case PACK_MODE_G50:
338 i = (odev->dev_width - 1 - x)/8 + y*odev->dev_width/8;
339 break;
340
341 default:
342 i = 0;
343 printk(ASUS_OLED_ERROR "Unknown OLED Pack Mode: %d!\n", odev->pack_mode);
344 break;
345 }
346
347 if (i >= odev->buf_size) {
348 printk(ASUS_OLED_ERROR "Buffer overflow! Report a bug in the driver: offs: %d >= %d i: %d (x: %d y: %d)\n",
349 (int) odev->buf_offs, (int) odev->buf_size, (int) i, (int) x, (int) y);
350 return -EIO;
351 }
352
353 switch (odev->pack_mode)
354 {
355 case PACK_MODE_G1:
356 odev->buf[i] &= ~(1<<(y%8));
357 break;
358
359 case PACK_MODE_G50:
360 odev->buf[i] &= ~(1<<(x%8));
361 break;
362
363 default:
364 // cannot get here; stops gcc complaining
365 ;
366 }
367 }
368
369 odev->last_val = val;
370 odev->buf_offs++;
371 }
372
373 return 0;
374 }
375
376 static ssize_t odev_set_picture(struct asus_oled_dev *odev, const char *buf, size_t count)
377 {
378 size_t offs = 0, max_offs;
379
380 if (count < 1) return 0;
381
382 if (tolower(buf[0]) == 'b'){
383 // binary mode, set the entire memory
384
385 size_t i;
386
387 odev->buf_size = (odev->dev_width * ASUS_OLED_DISP_HEIGHT) / 8;
388
389 if (odev->buf) kfree(odev->buf);
390 odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
391
392 memset(odev->buf, 0xff, odev->buf_size);
393
394 for (i=1; i < count && i<=32*32; i++){
395 odev->buf[i-1] = buf[i];
396 odev->buf_offs = i-1;
397 }
398
399 odev->width=odev->dev_width / 8;
400 odev->height=ASUS_OLED_DISP_HEIGHT;
401 odev->x_shift=0;
402 odev->y_shift=0;
403 odev->last_val=0;
404
405 send_data(odev);
406
407 return count;
408 }
409
410 if (buf[0] == '<') {
411 size_t i;
412 size_t w = 0, h = 0;
413 size_t w_mem, h_mem;
414
415 if (count < 10 || buf[2] != ':') {
416 goto error_header;
417 }
418
419 switch(tolower(buf[1])) {
420 case ASUS_OLED_STATIC:
421 case ASUS_OLED_ROLL:
422 case ASUS_OLED_FLASH:
423 odev->pic_mode = buf[1];
424 break;
425 default:
426 printk(ASUS_OLED_ERROR "Wrong picture mode: '%c'.\n", buf[1]);
427 return -EIO;
428 break;
429 }
430
431 for (i = 3; i < count; ++i) {
432 if (buf[i] >= '0' && buf[i] <= '9') {
433 w = 10*w + (buf[i] - '0');
434
435 if (w > ASUS_OLED_MAX_WIDTH) goto error_width;
436 }
437 else if (tolower(buf[i]) == 'x') break;
438 else goto error_width;
439 }
440
441 for (++i; i < count; ++i) {
442 if (buf[i] >= '0' && buf[i] <= '9') {
443 h = 10*h + (buf[i] - '0');
444
445 if (h > ASUS_OLED_DISP_HEIGHT) goto error_height;
446 }
447 else if (tolower(buf[i]) == '>') break;
448 else goto error_height;
449 }
450
451 if (w < 1 || w > ASUS_OLED_MAX_WIDTH) goto error_width;
452
453 if (h < 1 || h > ASUS_OLED_DISP_HEIGHT) goto error_height;
454
455 if (i >= count || buf[i] != '>') goto error_header;
456
457 offs = i+1;
458
459 if (w % (odev->dev_width) != 0)
460 w_mem = (w/(odev->dev_width) + 1)*(odev->dev_width);
461 else
462 w_mem = w;
463
464 if (h < ASUS_OLED_DISP_HEIGHT)
465 h_mem = ASUS_OLED_DISP_HEIGHT;
466 else
467 h_mem = h;
468
469 odev->buf_size = w_mem * h_mem / 8;
470
471 if (odev->buf) kfree(odev->buf);
472 odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
473
474 if (odev->buf == NULL) {
475 odev->buf_size = 0;
476 printk(ASUS_OLED_ERROR "Out of memory!\n");
477 return -ENOMEM;
478 }
479
480 memset(odev->buf, 0xff, odev->buf_size);
481
482 odev->buf_offs = 0;
483 odev->width = w;
484 odev->height = h;
485 odev->x_shift = 0;
486 odev->y_shift = 0;
487 odev->last_val = 0;
488
489 if (odev->pic_mode == ASUS_OLED_FLASH) {
490 if (h < ASUS_OLED_DISP_HEIGHT/2)
491 odev->y_shift = (ASUS_OLED_DISP_HEIGHT/2 - h)/2;
492 }
493 else {
494 if (h < ASUS_OLED_DISP_HEIGHT)
495 odev->y_shift = (ASUS_OLED_DISP_HEIGHT - h)/2;
496 }
497
498 if (w < (odev->dev_width))
499 odev->x_shift = ((odev->dev_width) - w)/2;
500 }
501
502 max_offs = odev->width * odev->height;
503
504 while (offs < count && odev->buf_offs < max_offs) {
505 int ret;
506
507 if (buf[offs] == '1' || buf[offs] == '#') {
508 if ( (ret = append_values(odev, 1, 1)) < 0) return ret;
509 }
510 else if (buf[offs] == '0' || buf[offs] == ' ') {
511 if ( (ret = append_values(odev, 0, 1)) < 0) return ret;
512 }
513 else if (buf[offs] == '\n') {
514 // New line detected. Lets assume, that all characters till the end of the
515 // line were equal to the last character in this line.
516 if (odev->buf_offs % odev->width != 0)
517 if ( (ret = append_values(odev, odev->last_val,
518 odev->width - (odev->buf_offs % odev->width))) < 0) return ret;
519 }
520
521 offs++;
522 }
523
524 if (odev->buf_offs >= max_offs) send_data(odev);
525
526 return count;
527
528 error_width:
529 printk(ASUS_OLED_ERROR "Wrong picture width specified.\n");
530 return -EIO;
531
532 error_height:
533 printk(ASUS_OLED_ERROR "Wrong picture height specified.\n");
534 return -EIO;
535
536 error_header:
537 printk(ASUS_OLED_ERROR "Wrong picture header.\n");
538 return -EIO;
539 }
540
541 static ssize_t set_picture(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
542 {
543 struct usb_interface *intf = to_usb_interface(dev);
544
545 return odev_set_picture(usb_get_intfdata(intf), buf, count);
546 }
547
548 static ssize_t class_set_picture(struct device *device, struct device_attribute *attr, const char *buf, size_t count)
549 {
550 return odev_set_picture((struct asus_oled_dev *) dev_get_drvdata(device), buf, count);
551 }
552
553 #define ASUS_OLED_DEVICE_ATTR(_file) dev_attr_asus_oled_##_file
554
555 static DEVICE_ATTR(asus_oled_enabled, S_IWUGO | S_IRUGO, get_enabled, set_enabled);
556 static DEVICE_ATTR(asus_oled_picture, S_IWUGO , NULL, set_picture);
557
558 static DEVICE_ATTR(enabled, S_IWUGO | S_IRUGO, class_get_enabled, class_set_enabled);
559 static DEVICE_ATTR(picture, S_IWUGO, NULL, class_set_picture);
560
561 static int asus_oled_probe(struct usb_interface *interface, const struct usb_device_id *id)
562 {
563 struct usb_device *udev = interface_to_usbdev(interface);
564 struct asus_oled_dev *odev = NULL;
565 int retval = -ENOMEM;
566 uint16_t dev_width = 0;
567 oled_pack_mode_t pack_mode = PACK_MODE_LAST;
568 const struct oled_dev_desc_str * dev_desc = oled_dev_desc_table;
569 const char *desc = 0;
570
571 if (id == 0) {
572 // Even possible? Just to make sure...
573 dev_err(&interface->dev, "No usb_device_id provided!\n");
574 return -ENODEV;
575 }
576
577 for (; dev_desc->idVendor; dev_desc++)
578 {
579 if (dev_desc->idVendor == id->idVendor
580 && dev_desc->idProduct == id->idProduct)
581 {
582 dev_width = dev_desc->devWidth;
583 desc = dev_desc->devDesc;
584 pack_mode = dev_desc->packMode;
585 break;
586 }
587 }
588
589 if ( !desc || dev_width < 1 || pack_mode == PACK_MODE_LAST) {
590 dev_err(&interface->dev, "Missing or incomplete device description!\n");
591 return -ENODEV;
592 }
593
594 odev = kzalloc(sizeof(struct asus_oled_dev), GFP_KERNEL);
595
596 if (odev == NULL) {
597 dev_err(&interface->dev, "Out of memory\n");
598 return -ENOMEM;
599 }
600
601 odev->udev = usb_get_dev(udev);
602 odev->pic_mode = ASUS_OLED_STATIC;
603 odev->dev_width = dev_width;
604 odev->pack_mode = pack_mode;
605 odev->height = 0;
606 odev->width = 0;
607 odev->x_shift = 0;
608 odev->y_shift = 0;
609 odev->buf_offs = 0;
610 odev->buf_size = 0;
611 odev->last_val = 0;
612 odev->buf = NULL;
613 odev->enabled = 1;
614 odev->dev = 0;
615
616 usb_set_intfdata (interface, odev);
617
618 if ((retval = device_create_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled)))) {
619 goto err_files;
620 }
621
622 if ((retval = device_create_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture)))) {
623 goto err_files;
624 }
625
626 odev->dev = device_create(oled_class, &interface->dev, MKDEV(0,0),
627 NULL,"oled_%d", ++oled_num);
628
629 if (IS_ERR(odev->dev)) {
630 retval = PTR_ERR(odev->dev);
631 goto err_files;
632 }
633
634 dev_set_drvdata(odev->dev, odev);
635
636 if ( (retval = device_create_file(odev->dev, &dev_attr_enabled))) {
637 goto err_class_enabled;
638 }
639
640 if ( (retval = device_create_file(odev->dev, &dev_attr_picture))) {
641 goto err_class_picture;
642 }
643
644 dev_info(&interface->dev, "Attached Asus OLED device: %s [width %u, pack_mode %d]\n", desc, odev->dev_width, odev->pack_mode);
645
646 if (start_off)
647 enable_oled(odev, 0);
648
649 return 0;
650
651 err_class_picture:
652 device_remove_file(odev->dev, &dev_attr_picture);
653
654 err_class_enabled:
655 device_remove_file(odev->dev, &dev_attr_enabled);
656 device_unregister(odev->dev);
657
658 err_files:
659 device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled));
660 device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
661
662 usb_set_intfdata (interface, NULL);
663 usb_put_dev(odev->udev);
664 kfree(odev);
665
666 return retval;
667 }
668
669 static void asus_oled_disconnect(struct usb_interface *interface)
670 {
671 struct asus_oled_dev *odev;
672
673 odev = usb_get_intfdata (interface);
674 usb_set_intfdata (interface, NULL);
675
676 device_remove_file(odev->dev, &dev_attr_picture);
677 device_remove_file(odev->dev, &dev_attr_enabled);
678 device_unregister(odev->dev);
679
680 device_remove_file(&interface->dev, & ASUS_OLED_DEVICE_ATTR(picture));
681 device_remove_file(&interface->dev, & ASUS_OLED_DEVICE_ATTR(enabled));
682
683 usb_put_dev(odev->udev);
684
685 if (odev->buf) kfree(odev->buf);
686
687 kfree(odev);
688
689 dev_info(&interface->dev, "Disconnected Asus OLED device\n");
690 }
691
692 static struct usb_driver oled_driver = {
693 .name = ASUS_OLED_NAME,
694 .probe = asus_oled_probe,
695 .disconnect = asus_oled_disconnect,
696 .id_table = id_table,
697 };
698
699 static ssize_t version_show(struct class *dev, char *buf)
700 {
701 return sprintf(buf, ASUS_OLED_UNDERSCORE_NAME " %s\n", ASUS_OLED_VERSION);
702 }
703
704 static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
705
706 static int __init asus_oled_init(void)
707 {
708 int retval = 0;
709 oled_class = class_create(THIS_MODULE, ASUS_OLED_UNDERSCORE_NAME);
710
711 if (IS_ERR(oled_class)) {
712 err("Error creating " ASUS_OLED_UNDERSCORE_NAME " class");
713 return PTR_ERR(oled_class);
714 }
715
716 if ((retval = class_create_file(oled_class, &class_attr_version))) {
717 err("Error creating class version file");
718 goto error;
719 }
720
721 retval = usb_register(&oled_driver);
722
723 if (retval) {
724 err("usb_register failed. Error number %d", retval);
725 goto error;
726 }
727
728 return retval;
729
730 error:
731 class_destroy(oled_class);
732 return retval;
733 }
734
735 static void __exit asus_oled_exit(void)
736 {
737 class_remove_file(oled_class, &class_attr_version);
738 class_destroy(oled_class);
739
740 usb_deregister(&oled_driver);
741 }
742
743 module_init (asus_oled_init);
744 module_exit (asus_oled_exit);
745
Nao low-level kernelspace/userspace library that runs on our robots, Nao-Team HTWK