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Staging: asus_oled: asus_oled.c: Checkpatch cleanup
[linux-2.6.git] / drivers / staging / asus_oled / asus_oled.c
blob5b279fb30f3f21aa74e3192e522e1ce233f938f2
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 #define USB_VENDOR_ID_ASUS 0x0b05
56 #define USB_DEVICE_ID_ASUS_LCM 0x1726
57 #define USB_DEVICE_ID_ASUS_LCM2 0x175b
58
59 MODULE_AUTHOR("Jakub Schmidtke, sjakub@gmail.com");
60 MODULE_DESCRIPTION("Asus OLED Driver v" ASUS_OLED_VERSION);
61 MODULE_LICENSE("GPL");
62
63 static struct class *oled_class;
64 static int oled_num;
65
66 static uint start_off;
67
68 module_param(start_off, uint, 0644);
69
70 MODULE_PARM_DESC(start_off,
71 "Set to 1 to switch off OLED display after it is attached");
72
73 enum oled_pack_mode{
74 PACK_MODE_G1,
75 PACK_MODE_G50,
76 PACK_MODE_LAST
77 };
78
79 struct oled_dev_desc_str {
80 uint16_t idVendor;
81 uint16_t idProduct;
82 /* width of display */
83 uint16_t devWidth;
84 /* formula to be used while packing the picture */
85 enum oled_pack_mode packMode;
86 const char *devDesc;
87 };
88
89 /* table of devices that work with this driver */
90 static const struct usb_device_id id_table[] = {
91 /* Asus G1/G2 (and variants)*/
92 { USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_LCM) },
93 /* Asus G50V (and possibly others - G70? G71?)*/
94 { USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_LCM2) },
95 { },
96 };
97
98 /* parameters of specific devices */
99 static struct oled_dev_desc_str oled_dev_desc_table[] = {
100 { USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_LCM, 128, PACK_MODE_G1,
101 "G1/G2" },
102 { USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_LCM2, 256, PACK_MODE_G50,
103 "G50" },
104 { },
105 };
106
107 MODULE_DEVICE_TABLE(usb, id_table);
108
109 struct asus_oled_header {
110 uint8_t magic1;
111 uint8_t magic2;
112 uint8_t flags;
113 uint8_t value3;
114 uint8_t buffer1;
115 uint8_t buffer2;
116 uint8_t value6;
117 uint8_t value7;
118 uint8_t value8;
119 uint8_t padding2[7];
120 } __attribute((packed));
121
122 struct asus_oled_packet {
123 struct asus_oled_header header;
124 uint8_t bitmap[ASUS_OLED_PACKET_BUF_SIZE];
125 } __attribute((packed));
126
127 struct asus_oled_dev {
128 struct usb_device *udev;
129 uint8_t pic_mode;
130 uint16_t dev_width;
131 enum oled_pack_mode pack_mode;
132 size_t height;
133 size_t width;
134 size_t x_shift;
135 size_t y_shift;
136 size_t buf_offs;
137 uint8_t last_val;
138 size_t buf_size;
139 char *buf;
140 uint8_t enabled;
141 struct device *dev;
142 };
143
144 static void setup_packet_header(struct asus_oled_packet *packet, char flags,
145 char value3, char buffer1, char buffer2, char value6,
146 char value7, char value8)
147 {
148 memset(packet, 0, sizeof(struct asus_oled_header));
149 packet->header.magic1 = 0x55;
150 packet->header.magic2 = 0xaa;
151 packet->header.flags = flags;
152 packet->header.value3 = value3;
153 packet->header.buffer1 = buffer1;
154 packet->header.buffer2 = buffer2;
155 packet->header.value6 = value6;
156 packet->header.value7 = value7;
157 packet->header.value8 = value8;
158 }
159
160 static void enable_oled(struct asus_oled_dev *odev, uint8_t enabl)
161 {
162 int a;
163 int retval;
164 int act_len;
165 struct asus_oled_packet *packet;
166
167 packet = kzalloc(sizeof(struct asus_oled_packet), GFP_KERNEL);
168
169 if (!packet) {
170 dev_err(&odev->udev->dev, "out of memory\n");
171 return;
172 }
173
174 setup_packet_header(packet, 0x20, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00);
175
176 if (enabl)
177 packet->bitmap[0] = 0xaf;
178 else
179 packet->bitmap[0] = 0xae;
180
181 for (a = 0; a < 1; a++) {
182 retval = usb_bulk_msg(odev->udev,
183 usb_sndbulkpipe(odev->udev, 2),
184 packet,
185 sizeof(struct asus_oled_header) + 1,
186 &act_len,
187 -1);
188
189 if (retval)
190 dev_dbg(&odev->udev->dev, "retval = %d\n", retval);
191 }
192
193 odev->enabled = enabl;
194
195 kfree(packet);
196 }
197
198 static ssize_t set_enabled(struct device *dev, struct device_attribute *attr,
199 const char *buf, size_t count)
200 {
201 struct usb_interface *intf = to_usb_interface(dev);
202 struct asus_oled_dev *odev = usb_get_intfdata(intf);
203 unsigned long value;
204 if (strict_strtoul(buf, 10, &value))
205 return -EINVAL;
206
207 enable_oled(odev, value);
208
209 return count;
210 }
211
212 static ssize_t class_set_enabled(struct device *device,
213 struct device_attribute *attr,
214 const char *buf, size_t count)
215 {
216 struct asus_oled_dev *odev =
217 (struct asus_oled_dev *) dev_get_drvdata(device);
218 unsigned long value;
219
220 if (strict_strtoul(buf, 10, &value))
221 return -EINVAL;
222
223 enable_oled(odev, value);
224
225 return count;
226 }
227
228 static ssize_t get_enabled(struct device *dev, struct device_attribute *attr,
229 char *buf)
230 {
231 struct usb_interface *intf = to_usb_interface(dev);
232 struct asus_oled_dev *odev = usb_get_intfdata(intf);
233
234 return sprintf(buf, "%d\n", odev->enabled);
235 }
236
237 static ssize_t class_get_enabled(struct device *device,
238 struct device_attribute *attr, char *buf)
239 {
240 struct asus_oled_dev *odev =
241 (struct asus_oled_dev *) dev_get_drvdata(device);
242
243 return sprintf(buf, "%d\n", odev->enabled);
244 }
245
246 static void send_packets(struct usb_device *udev,
247 struct asus_oled_packet *packet,
248 char *buf, uint8_t p_type, size_t p_num)
249 {
250 size_t i;
251 int act_len;
252
253 for (i = 0; i < p_num; i++) {
254 int retval;
255
256 switch (p_type) {
257 case ASUS_OLED_ROLL:
258 setup_packet_header(packet, 0x40, 0x80, p_num,
259 i + 1, 0x00, 0x01, 0xff);
260 break;
261 case ASUS_OLED_STATIC:
262 setup_packet_header(packet, 0x10 + i, 0x80, 0x01,
263 0x01, 0x00, 0x01, 0x00);
264 break;
265 case ASUS_OLED_FLASH:
266 setup_packet_header(packet, 0x10 + i, 0x80, 0x01,
267 0x01, 0x00, 0x00, 0xff);
268 break;
269 }
270
271 memcpy(packet->bitmap, buf + (ASUS_OLED_PACKET_BUF_SIZE*i),
272 ASUS_OLED_PACKET_BUF_SIZE);
273
274 retval = usb_bulk_msg(udev, usb_sndctrlpipe(udev, 2),
275 packet, sizeof(struct asus_oled_packet),
276 &act_len, -1);
277
278 if (retval)
279 dev_dbg(&udev->dev, "retval = %d\n", retval);
280 }
281 }
282
283 static void send_packet(struct usb_device *udev,
284 struct asus_oled_packet *packet,
285 size_t offset, size_t len, char *buf, uint8_t b1,
286 uint8_t b2, uint8_t b3, uint8_t b4, uint8_t b5,
287 uint8_t b6) {
288 int retval;
289 int act_len;
290
291 setup_packet_header(packet, b1, b2, b3, b4, b5, b6, 0x00);
292 memcpy(packet->bitmap, buf + offset, len);
293
294 retval = usb_bulk_msg(udev,
295 usb_sndctrlpipe(udev, 2),
296 packet,
297 sizeof(struct asus_oled_packet),
298 &act_len,
299 -1);
300
301 if (retval)
302 dev_dbg(&udev->dev, "retval = %d\n", retval);
303 }
304
305
306 static void send_packets_g50(struct usb_device *udev,
307 struct asus_oled_packet *packet, char *buf)
308 {
309 send_packet(udev, packet, 0, 0x100, buf,
310 0x10, 0x00, 0x02, 0x01, 0x00, 0x01);
311 send_packet(udev, packet, 0x100, 0x080, buf,
312 0x10, 0x00, 0x02, 0x02, 0x80, 0x00);
313
314 send_packet(udev, packet, 0x180, 0x100, buf,
315 0x11, 0x00, 0x03, 0x01, 0x00, 0x01);
316 send_packet(udev, packet, 0x280, 0x100, buf,
317 0x11, 0x00, 0x03, 0x02, 0x00, 0x01);
318 send_packet(udev, packet, 0x380, 0x080, buf,
319 0x11, 0x00, 0x03, 0x03, 0x80, 0x00);
320 }
321
322
323 static void send_data(struct asus_oled_dev *odev)
324 {
325 size_t packet_num = odev->buf_size / ASUS_OLED_PACKET_BUF_SIZE;
326 struct asus_oled_packet *packet;
327
328 packet = kzalloc(sizeof(struct asus_oled_packet), GFP_KERNEL);
329
330 if (!packet) {
331 dev_err(&odev->udev->dev, "out of memory\n");
332 return;
333 }
334
335 if (odev->pack_mode == PACK_MODE_G1) {
336 /* When sending roll-mode data the display updated only
337 first packet. I have no idea why, but when static picture
338 is sent just before rolling picture everything works fine. */
339 if (odev->pic_mode == ASUS_OLED_ROLL)
340 send_packets(odev->udev, packet, odev->buf,
341 ASUS_OLED_STATIC, 2);
342
343 /* Only ROLL mode can use more than 2 packets.*/
344 if (odev->pic_mode != ASUS_OLED_ROLL && packet_num > 2)
345 packet_num = 2;
346
347 send_packets(odev->udev, packet, odev->buf,
348 odev->pic_mode, packet_num);
349 } else if (odev->pack_mode == PACK_MODE_G50) {
350 send_packets_g50(odev->udev, packet, odev->buf);
351 }
352
353 kfree(packet);
354 }
355
356 static int append_values(struct asus_oled_dev *odev, uint8_t val, size_t count)
357 {
358 while (count-- > 0 && val) {
359 size_t x = odev->buf_offs % odev->width;
360 size_t y = odev->buf_offs / odev->width;
361 size_t i;
362
363 x += odev->x_shift;
364 y += odev->y_shift;
365
366 switch (odev->pack_mode) {
367 case PACK_MODE_G1:
368 /* i = (x/128)*640 + 127 - x + (y/8)*128;
369 This one for 128 is the same, but might be better
370 for different widths? */
371 i = (x/odev->dev_width)*640 +
372 odev->dev_width - 1 - x +
373 (y/8)*odev->dev_width;
374 break;
375
376 case PACK_MODE_G50:
377 i = (odev->dev_width - 1 - x)/8 + y*odev->dev_width/8;
378 break;
379
380 default:
381 i = 0;
382 printk(ASUS_OLED_ERROR "Unknown OLED Pack Mode: %d!\n",
383 odev->pack_mode);
384 break;
385 }
386
387 if (i >= odev->buf_size) {
388 printk(ASUS_OLED_ERROR "Buffer overflow! Report a bug:"
389 "offs: %d >= %d i: %d (x: %d y: %d)\n",
390 (int) odev->buf_offs, (int) odev->buf_size,
391 (int) i, (int) x, (int) y);
392 return -EIO;
393 }
394
395 switch (odev->pack_mode) {
396 case PACK_MODE_G1:
397 odev->buf[i] &= ~(1<<(y%8));
398 break;
399
400 case PACK_MODE_G50:
401 odev->buf[i] &= ~(1<<(x%8));
402 break;
403
404 default:
405 /* cannot get here; stops gcc complaining*/
406 ;
407 }
408
409 odev->last_val = val;
410 odev->buf_offs++;
411 }
412
413 return 0;
414 }
415
416 static ssize_t odev_set_picture(struct asus_oled_dev *odev,
417 const char *buf, size_t count)
418 {
419 size_t offs = 0, max_offs;
420
421 if (count < 1)
422 return 0;
423
424 if (tolower(buf[0]) == 'b') {
425 /* binary mode, set the entire memory*/
426
427 size_t i;
428
429 odev->buf_size = (odev->dev_width * ASUS_OLED_DISP_HEIGHT) / 8;
430
431 kfree(odev->buf);
432 odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
433 if (odev->buf == NULL) {
434 odev->buf_size = 0;
435 printk(ASUS_OLED_ERROR "Out of memory!\n");
436 return -ENOMEM;
437 }
438
439 memset(odev->buf, 0xff, odev->buf_size);
440
441 for (i = 1; i < count && i <= 32 * 32; i++) {
442 odev->buf[i-1] = buf[i];
443 odev->buf_offs = i-1;
444 }
445
446 odev->width = odev->dev_width / 8;
447 odev->height = ASUS_OLED_DISP_HEIGHT;
448 odev->x_shift = 0;
449 odev->y_shift = 0;
450 odev->last_val = 0;
451
452 send_data(odev);
453
454 return count;
455 }
456
457 if (buf[0] == '<') {
458 size_t i;
459 size_t w = 0, h = 0;
460 size_t w_mem, h_mem;
461
462 if (count < 10 || buf[2] != ':')
463 goto error_header;
464
465
466 switch (tolower(buf[1])) {
467 case ASUS_OLED_STATIC:
468 case ASUS_OLED_ROLL:
469 case ASUS_OLED_FLASH:
470 odev->pic_mode = buf[1];
471 break;
472 default:
473 printk(ASUS_OLED_ERROR "Wrong picture mode: '%c'.\n",
474 buf[1]);
475 return -EIO;
476 break;
477 }
478
479 for (i = 3; i < count; ++i) {
480 if (buf[i] >= '0' && buf[i] <= '9') {
481 w = 10*w + (buf[i] - '0');
482
483 if (w > ASUS_OLED_MAX_WIDTH)
484 goto error_width;
485 } else if (tolower(buf[i]) == 'x') {
486 break;
487 } else {
488 goto error_width;
489 }
490 }
491
492 for (++i; i < count; ++i) {
493 if (buf[i] >= '0' && buf[i] <= '9') {
494 h = 10*h + (buf[i] - '0');
495
496 if (h > ASUS_OLED_DISP_HEIGHT)
497 goto error_height;
498 } else if (tolower(buf[i]) == '>') {
499 break;
500 } else {
501 goto error_height;
502 }
503 }
504
505 if (w < 1 || w > ASUS_OLED_MAX_WIDTH)
506 goto error_width;
507
508 if (h < 1 || h > ASUS_OLED_DISP_HEIGHT)
509 goto error_height;
510
511 if (i >= count || buf[i] != '>')
512 goto error_header;
513
514 offs = i+1;
515
516 if (w % (odev->dev_width) != 0)
517 w_mem = (w/(odev->dev_width) + 1)*(odev->dev_width);
518 else
519 w_mem = w;
520
521 if (h < ASUS_OLED_DISP_HEIGHT)
522 h_mem = ASUS_OLED_DISP_HEIGHT;
523 else
524 h_mem = h;
525
526 odev->buf_size = w_mem * h_mem / 8;
527
528 kfree(odev->buf);
529 odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
530
531 if (odev->buf == NULL) {
532 odev->buf_size = 0;
533 printk(ASUS_OLED_ERROR "Out of memory!\n");
534 return -ENOMEM;
535 }
536
537 memset(odev->buf, 0xff, odev->buf_size);
538
539 odev->buf_offs = 0;
540 odev->width = w;
541 odev->height = h;
542 odev->x_shift = 0;
543 odev->y_shift = 0;
544 odev->last_val = 0;
545
546 if (odev->pic_mode == ASUS_OLED_FLASH) {
547 if (h < ASUS_OLED_DISP_HEIGHT/2)
548 odev->y_shift = (ASUS_OLED_DISP_HEIGHT/2 - h)/2;
549 } else {
550 if (h < ASUS_OLED_DISP_HEIGHT)
551 odev->y_shift = (ASUS_OLED_DISP_HEIGHT - h)/2;
552 }
553
554 if (w < (odev->dev_width))
555 odev->x_shift = ((odev->dev_width) - w)/2;
556 }
557
558 max_offs = odev->width * odev->height;
559
560 while (offs < count && odev->buf_offs < max_offs) {
561 int ret = 0;
562
563 if (buf[offs] == '1' || buf[offs] == '#') {
564 ret = append_values(odev, 1, 1);
565 if (ret < 0)
566 return ret;
567 } else if (buf[offs] == '0' || buf[offs] == ' ') {
568 ret = append_values(odev, 0, 1);
569 if (ret < 0)
570 return ret;
571 } else if (buf[offs] == '\n') {
572 /* New line detected. Lets assume, that all characters
573 till the end of the line were equal to the last
574 character in this line.*/
575 if (odev->buf_offs % odev->width != 0)
576 ret = append_values(odev, odev->last_val,
577 odev->width -
578 (odev->buf_offs %
579 odev->width));
580 if (ret < 0)
581 return ret;
582 }
583
584 offs++;
585 }
586
587 if (odev->buf_offs >= max_offs)
588 send_data(odev);
589
590 return count;
591
592 error_width:
593 printk(ASUS_OLED_ERROR "Wrong picture width specified.\n");
594 return -EIO;
595
596 error_height:
597 printk(ASUS_OLED_ERROR "Wrong picture height specified.\n");
598 return -EIO;
599
600 error_header:
601 printk(ASUS_OLED_ERROR "Wrong picture header.\n");
602 return -EIO;
603 }
604
605 static ssize_t set_picture(struct device *dev, struct device_attribute *attr,
606 const char *buf, size_t count)
607 {
608 struct usb_interface *intf = to_usb_interface(dev);
609
610 return odev_set_picture(usb_get_intfdata(intf), buf, count);
611 }
612
613 static ssize_t class_set_picture(struct device *device,
614 struct device_attribute *attr,
615 const char *buf, size_t count)
616 {
617 return odev_set_picture((struct asus_oled_dev *)
618 dev_get_drvdata(device), buf, count);
619 }
620
621 #define ASUS_OLED_DEVICE_ATTR(_file) dev_attr_asus_oled_##_file
622
623 static DEVICE_ATTR(asus_oled_enabled, S_IWUGO | S_IRUGO,
624 get_enabled, set_enabled);
625 static DEVICE_ATTR(asus_oled_picture, S_IWUGO , NULL, set_picture);
626
627 static DEVICE_ATTR(enabled, S_IWUGO | S_IRUGO,
628 class_get_enabled, class_set_enabled);
629 static DEVICE_ATTR(picture, S_IWUGO, NULL, class_set_picture);
630
631 static int asus_oled_probe(struct usb_interface *interface,
632 const struct usb_device_id *id)
633 {
634 struct usb_device *udev = interface_to_usbdev(interface);
635 struct asus_oled_dev *odev = NULL;
636 int retval = -ENOMEM;
637 uint16_t dev_width = 0;
638 enum oled_pack_mode pack_mode = PACK_MODE_LAST;
639 const struct oled_dev_desc_str *dev_desc = oled_dev_desc_table;
640 const char *desc = NULL;
641
642 if (!id) {
643 /* Even possible? Just to make sure...*/
644 dev_err(&interface->dev, "No usb_device_id provided!\n");
645 return -ENODEV;
646 }
647
648 for (; dev_desc->idVendor; dev_desc++) {
649 if (dev_desc->idVendor == id->idVendor
650 && dev_desc->idProduct == id->idProduct) {
651 dev_width = dev_desc->devWidth;
652 desc = dev_desc->devDesc;
653 pack_mode = dev_desc->packMode;
654 break;
655 }
656 }
657
658 if (!desc || dev_width < 1 || pack_mode == PACK_MODE_LAST) {
659 dev_err(&interface->dev,
660 "Missing or incomplete device description!\n");
661 return -ENODEV;
662 }
663
664 odev = kzalloc(sizeof(struct asus_oled_dev), GFP_KERNEL);
665
666 if (odev == NULL) {
667 dev_err(&interface->dev, "Out of memory\n");
668 return -ENOMEM;
669 }
670
671 odev->udev = usb_get_dev(udev);
672 odev->pic_mode = ASUS_OLED_STATIC;
673 odev->dev_width = dev_width;
674 odev->pack_mode = pack_mode;
675 odev->height = 0;
676 odev->width = 0;
677 odev->x_shift = 0;
678 odev->y_shift = 0;
679 odev->buf_offs = 0;
680 odev->buf_size = 0;
681 odev->last_val = 0;
682 odev->buf = NULL;
683 odev->enabled = 1;
684 odev->dev = NULL;
685
686 usb_set_intfdata(interface, odev);
687
688 retval = device_create_file(&interface->dev,
689 &ASUS_OLED_DEVICE_ATTR(enabled));
690 if (retval)
691 goto err_files;
692
693 retval = device_create_file(&interface->dev,
694 &ASUS_OLED_DEVICE_ATTR(picture));
695 if (retval)
696 goto err_files;
697
698 odev->dev = device_create(oled_class, &interface->dev, MKDEV(0, 0),
699 NULL, "oled_%d", ++oled_num);
700
701 if (IS_ERR(odev->dev)) {
702 retval = PTR_ERR(odev->dev);
703 goto err_files;
704 }
705
706 dev_set_drvdata(odev->dev, odev);
707
708 retval = device_create_file(odev->dev, &dev_attr_enabled);
709 if (retval)
710 goto err_class_enabled;
711
712 retval = device_create_file(odev->dev, &dev_attr_picture);
713 if (retval)
714 goto err_class_picture;
715
716 dev_info(&interface->dev,
717 "Attached Asus OLED device: %s [width %u, pack_mode %d]\n",
718 desc, odev->dev_width, odev->pack_mode);
719
720 if (start_off)
721 enable_oled(odev, 0);
722
723 return 0;
724
725 err_class_picture:
726 device_remove_file(odev->dev, &dev_attr_picture);
727
728 err_class_enabled:
729 device_remove_file(odev->dev, &dev_attr_enabled);
730 device_unregister(odev->dev);
731
732 err_files:
733 device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled));
734 device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
735
736 usb_set_intfdata(interface, NULL);
737 usb_put_dev(odev->udev);
738 kfree(odev);
739
740 return retval;
741 }
742
743 static void asus_oled_disconnect(struct usb_interface *interface)
744 {
745 struct asus_oled_dev *odev;
746
747 odev = usb_get_intfdata(interface);
748 usb_set_intfdata(interface, NULL);
749
750 device_remove_file(odev->dev, &dev_attr_picture);
751 device_remove_file(odev->dev, &dev_attr_enabled);
752 device_unregister(odev->dev);
753
754 device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
755 device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled));
756
757 usb_put_dev(odev->udev);
758
759 kfree(odev->buf);
760
761 kfree(odev);
762
763 dev_info(&interface->dev, "Disconnected Asus OLED device\n");
764 }
765
766 static struct usb_driver oled_driver = {
767 .name = ASUS_OLED_NAME,
768 .probe = asus_oled_probe,
769 .disconnect = asus_oled_disconnect,
770 .id_table = id_table,
771 };
772
773 static CLASS_ATTR_STRING(version, S_IRUGO,
774 ASUS_OLED_UNDERSCORE_NAME " " ASUS_OLED_VERSION);
775
776 static int __init asus_oled_init(void)
777 {
778 int retval = 0;
779 oled_class = class_create(THIS_MODULE, ASUS_OLED_UNDERSCORE_NAME);
780
781 if (IS_ERR(oled_class)) {
782 err("Error creating " ASUS_OLED_UNDERSCORE_NAME " class");
783 return PTR_ERR(oled_class);
784 }
785
786 retval = class_create_file(oled_class, &class_attr_version.attr);
787 if (retval) {
788 err("Error creating class version file");
789 goto error;
790 }
791
792 retval = usb_register(&oled_driver);
793
794 if (retval) {
795 err("usb_register failed. Error number %d", retval);
796 goto error;
797 }
798
799 return retval;
800
801 error:
802 class_destroy(oled_class);
803 return retval;
804 }
805
806 static void __exit asus_oled_exit(void)
807 {
808 class_remove_file(oled_class, &class_attr_version.attr);
809 class_destroy(oled_class);
810
811 usb_deregister(&oled_driver);
812 }
813
814 module_init(asus_oled_init);
815 module_exit(asus_oled_exit);
816
Linus' kernel tree