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OMAP: SDRC: Add several new register definitions
[linux-2.6/mini2440.git] / drivers / staging / asus_oled / asus_oled.c
blob9270f5df0204b38a8ca0637614c5e501291bc54f
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;
60 static int oled_num;
61
62 static uint start_off;
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)
164 packet->bitmap[0] = 0xaf;
165 else
166 packet->bitmap[0] = 0xae;
167
168 for (a = 0; a < 1; a++) {
169 retval = usb_bulk_msg(odev->udev,
170 usb_sndbulkpipe(odev->udev, 2),
171 packet,
172 sizeof(struct asus_oled_header) + 1,
173 &act_len,
174 -1);
175
176 if (retval)
177 dev_dbg(&odev->udev->dev, "retval = %d\n", retval);
178 }
179
180 odev->enabled = enabl;
181
182 kfree(packet);
183 }
184
185 static ssize_t set_enabled(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
186 {
187 struct usb_interface *intf = to_usb_interface(dev);
188 struct asus_oled_dev *odev = usb_get_intfdata(intf);
189 int temp = simple_strtoul(buf, NULL, 10);
190
191 enable_oled(odev, temp);
192
193 return count;
194 }
195
196 static ssize_t class_set_enabled(struct device *device, struct device_attribute *attr, const char *buf, size_t count)
197 {
198 struct asus_oled_dev *odev = (struct asus_oled_dev *) dev_get_drvdata(device);
199
200 int temp = simple_strtoul(buf, NULL, 10);
201
202 enable_oled(odev, temp);
203
204 return count;
205 }
206
207 static ssize_t get_enabled(struct device *dev, struct device_attribute *attr, char *buf)
208 {
209 struct usb_interface *intf = to_usb_interface(dev);
210 struct asus_oled_dev *odev = usb_get_intfdata(intf);
211
212 return sprintf(buf, "%d\n", odev->enabled);
213 }
214
215 static ssize_t class_get_enabled(struct device *device, struct device_attribute *attr, char *buf)
216 {
217 struct asus_oled_dev *odev = (struct asus_oled_dev *) dev_get_drvdata(device);
218
219 return sprintf(buf, "%d\n", odev->enabled);
220 }
221
222 static void send_packets(struct usb_device *udev, struct asus_oled_packet *packet,
223 char *buf, uint8_t p_type, size_t p_num)
224 {
225 size_t i;
226 int act_len;
227
228 for (i = 0; i < p_num; i++) {
229 int retval;
230
231 switch (p_type) {
232 case ASUS_OLED_ROLL:
233 SETUP_PACKET_HEADER(packet, 0x40, 0x80, p_num, i + 1, 0x00, 0x01, 0xff);
234 break;
235 case ASUS_OLED_STATIC:
236 SETUP_PACKET_HEADER(packet, 0x10 + i, 0x80, 0x01, 0x01, 0x00, 0x01, 0x00);
237 break;
238 case ASUS_OLED_FLASH:
239 SETUP_PACKET_HEADER(packet, 0x10 + i, 0x80, 0x01, 0x01, 0x00, 0x00, 0xff);
240 break;
241 }
242
243 memcpy(packet->bitmap, buf + (ASUS_OLED_PACKET_BUF_SIZE*i), ASUS_OLED_PACKET_BUF_SIZE);
244
245 retval = usb_bulk_msg(udev,
246 usb_sndctrlpipe(udev, 2),
247 packet,
248 sizeof(struct asus_oled_packet),
249 &act_len,
250 -1);
251
252 if (retval)
253 dev_dbg(&udev->dev, "retval = %d\n", retval);
254 }
255 }
256
257 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) {
258 int retval;
259 int act_len;
260
261 SETUP_PACKET_HEADER(packet, b1, b2, b3, b4, b5, b6, 0x00);
262 memcpy(packet->bitmap, buf + offset, len);
263
264 retval = usb_bulk_msg(udev,
265 usb_sndctrlpipe(udev, 2),
266 packet,
267 sizeof(struct asus_oled_packet),
268 &act_len,
269 -1);
270
271 if (retval)
272 dev_dbg(&udev->dev, "retval = %d\n", retval);
273 }
274
275
276 static void send_packets_g50(struct usb_device *udev, struct asus_oled_packet *packet, char *buf)
277 {
278 send_packet(udev, packet, 0, 0x100, buf, 0x10, 0x00, 0x02, 0x01, 0x00, 0x01);
279 send_packet(udev, packet, 0x100, 0x080, buf, 0x10, 0x00, 0x02, 0x02, 0x80, 0x00);
280
281 send_packet(udev, packet, 0x180, 0x100, buf, 0x11, 0x00, 0x03, 0x01, 0x00, 0x01);
282 send_packet(udev, packet, 0x280, 0x100, buf, 0x11, 0x00, 0x03, 0x02, 0x00, 0x01);
283 send_packet(udev, packet, 0x380, 0x080, buf, 0x11, 0x00, 0x03, 0x03, 0x80, 0x00);
284 }
285
286
287 static void send_data(struct asus_oled_dev *odev)
288 {
289 size_t packet_num = odev->buf_size / ASUS_OLED_PACKET_BUF_SIZE;
290 struct asus_oled_packet * packet;
291
292 packet = kzalloc(sizeof(struct asus_oled_packet), GFP_KERNEL);
293
294 if (!packet) {
295 dev_err(&odev->udev->dev, "out of memory\n");
296 return;
297 }
298
299 if (odev->pack_mode == PACK_MODE_G1) {
300 // When sending roll-mode data the display updated only first packet.
301 // I have no idea why, but when static picture is send just before
302 // rolling picture - everything works fine.
303 if (odev->pic_mode == ASUS_OLED_ROLL)
304 send_packets(odev->udev, packet, odev->buf, ASUS_OLED_STATIC, 2);
305
306 // Only ROLL mode can use more than 2 packets.
307 if (odev->pic_mode != ASUS_OLED_ROLL && packet_num > 2)
308 packet_num = 2;
309
310 send_packets(odev->udev, packet, odev->buf, odev->pic_mode, packet_num);
311 }
312 else
313 if (odev->pack_mode == PACK_MODE_G50) {
314 send_packets_g50(odev->udev, packet, odev->buf);
315 }
316
317 kfree(packet);
318 }
319
320 static int append_values(struct asus_oled_dev *odev, uint8_t val, size_t count)
321 {
322 while (count-- > 0) {
323 if (val) {
324 size_t x = odev->buf_offs % odev->width;
325 size_t y = odev->buf_offs / odev->width;
326 size_t i;
327
328 x += odev->x_shift;
329 y += odev->y_shift;
330
331 switch (odev->pack_mode)
332 {
333 case PACK_MODE_G1:
334 // i = (x/128)*640 + 127 - x + (y/8)*128;
335 // This one for 128 is the same, but might be better for different widths?
336 i = (x/odev->dev_width)*640 + odev->dev_width - 1 - x + (y/8)*odev->dev_width;
337 break;
338
339 case PACK_MODE_G50:
340 i = (odev->dev_width - 1 - x)/8 + y*odev->dev_width/8;
341 break;
342
343 default:
344 i = 0;
345 printk(ASUS_OLED_ERROR "Unknown OLED Pack Mode: %d!\n", odev->pack_mode);
346 break;
347 }
348
349 if (i >= odev->buf_size) {
350 printk(ASUS_OLED_ERROR "Buffer overflow! Report a bug in the driver: offs: %d >= %d i: %d (x: %d y: %d)\n",
351 (int) odev->buf_offs, (int) odev->buf_size, (int) i, (int) x, (int) y);
352 return -EIO;
353 }
354
355 switch (odev->pack_mode)
356 {
357 case PACK_MODE_G1:
358 odev->buf[i] &= ~(1<<(y%8));
359 break;
360
361 case PACK_MODE_G50:
362 odev->buf[i] &= ~(1<<(x%8));
363 break;
364
365 default:
366 // cannot get here; stops gcc complaining
367 ;
368 }
369 }
370
371 odev->last_val = val;
372 odev->buf_offs++;
373 }
374
375 return 0;
376 }
377
378 static ssize_t odev_set_picture(struct asus_oled_dev *odev, const char *buf, size_t count)
379 {
380 size_t offs = 0, max_offs;
381
382 if (count < 1)
383 return 0;
384
385 if (tolower(buf[0]) == 'b') {
386 // binary mode, set the entire memory
387
388 size_t i;
389
390 odev->buf_size = (odev->dev_width * ASUS_OLED_DISP_HEIGHT) / 8;
391
392 if (odev->buf)
393 kfree(odev->buf);
394 odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
395
396 memset(odev->buf, 0xff, odev->buf_size);
397
398 for (i = 1; i < count && i <= 32 * 32; i++) {
399 odev->buf[i-1] = buf[i];
400 odev->buf_offs = i-1;
401 }
402
403 odev->width = odev->dev_width / 8;
404 odev->height = ASUS_OLED_DISP_HEIGHT;
405 odev->x_shift = 0;
406 odev->y_shift = 0;
407 odev->last_val = 0;
408
409 send_data(odev);
410
411 return count;
412 }
413
414 if (buf[0] == '<') {
415 size_t i;
416 size_t w = 0, h = 0;
417 size_t w_mem, h_mem;
418
419 if (count < 10 || buf[2] != ':') {
420 goto error_header;
421 }
422
423 switch (tolower(buf[1])) {
424 case ASUS_OLED_STATIC:
425 case ASUS_OLED_ROLL:
426 case ASUS_OLED_FLASH:
427 odev->pic_mode = buf[1];
428 break;
429 default:
430 printk(ASUS_OLED_ERROR "Wrong picture mode: '%c'.\n", buf[1]);
431 return -EIO;
432 break;
433 }
434
435 for (i = 3; i < count; ++i) {
436 if (buf[i] >= '0' && buf[i] <= '9') {
437 w = 10*w + (buf[i] - '0');
438
439 if (w > ASUS_OLED_MAX_WIDTH)
440 goto error_width;
441 }
442 else if (tolower(buf[i]) == 'x')
443 break;
444 else
445 goto error_width;
446 }
447
448 for (++i; i < count; ++i) {
449 if (buf[i] >= '0' && buf[i] <= '9') {
450 h = 10*h + (buf[i] - '0');
451
452 if (h > ASUS_OLED_DISP_HEIGHT)
453 goto error_height;
454 }
455 else if (tolower(buf[i]) == '>')
456 break;
457 else
458 goto error_height;
459 }
460
461 if (w < 1 || w > ASUS_OLED_MAX_WIDTH)
462 goto error_width;
463
464 if (h < 1 || h > ASUS_OLED_DISP_HEIGHT)
465 goto error_height;
466
467 if (i >= count || buf[i] != '>')
468 goto error_header;
469
470 offs = i+1;
471
472 if (w % (odev->dev_width) != 0)
473 w_mem = (w/(odev->dev_width) + 1)*(odev->dev_width);
474 else
475 w_mem = w;
476
477 if (h < ASUS_OLED_DISP_HEIGHT)
478 h_mem = ASUS_OLED_DISP_HEIGHT;
479 else
480 h_mem = h;
481
482 odev->buf_size = w_mem * h_mem / 8;
483
484 if (odev->buf)
485 kfree(odev->buf);
486 odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
487
488 if (odev->buf == NULL) {
489 odev->buf_size = 0;
490 printk(ASUS_OLED_ERROR "Out of memory!\n");
491 return -ENOMEM;
492 }
493
494 memset(odev->buf, 0xff, odev->buf_size);
495
496 odev->buf_offs = 0;
497 odev->width = w;
498 odev->height = h;
499 odev->x_shift = 0;
500 odev->y_shift = 0;
501 odev->last_val = 0;
502
503 if (odev->pic_mode == ASUS_OLED_FLASH) {
504 if (h < ASUS_OLED_DISP_HEIGHT/2)
505 odev->y_shift = (ASUS_OLED_DISP_HEIGHT/2 - h)/2;
506 }
507 else {
508 if (h < ASUS_OLED_DISP_HEIGHT)
509 odev->y_shift = (ASUS_OLED_DISP_HEIGHT - h)/2;
510 }
511
512 if (w < (odev->dev_width))
513 odev->x_shift = ((odev->dev_width) - w)/2;
514 }
515
516 max_offs = odev->width * odev->height;
517
518 while (offs < count && odev->buf_offs < max_offs) {
519 int ret = 0;
520
521 if (buf[offs] == '1' || buf[offs] == '#') {
522 ret = append_values(odev, 1, 1);
523 if (ret < 0)
524 return ret;
525 }
526 else if (buf[offs] == '0' || buf[offs] == ' ') {
527 ret = append_values(odev, 0, 1);
528 if (ret < 0)
529 return ret;
530 }
531 else if (buf[offs] == '\n') {
532 // New line detected. Lets assume, that all characters till the end of the
533 // line were equal to the last character in this line.
534 if (odev->buf_offs % odev->width != 0)
535 ret = append_values(odev, odev->last_val,
536 odev->width - (odev->buf_offs % odev->width));
537 if (ret < 0)
538 return ret;
539 }
540
541 offs++;
542 }
543
544 if (odev->buf_offs >= max_offs)
545 send_data(odev);
546
547 return count;
548
549 error_width:
550 printk(ASUS_OLED_ERROR "Wrong picture width specified.\n");
551 return -EIO;
552
553 error_height:
554 printk(ASUS_OLED_ERROR "Wrong picture height specified.\n");
555 return -EIO;
556
557 error_header:
558 printk(ASUS_OLED_ERROR "Wrong picture header.\n");
559 return -EIO;
560 }
561
562 static ssize_t set_picture(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
563 {
564 struct usb_interface *intf = to_usb_interface(dev);
565
566 return odev_set_picture(usb_get_intfdata(intf), buf, count);
567 }
568
569 static ssize_t class_set_picture(struct device *device, struct device_attribute *attr, const char *buf, size_t count)
570 {
571 return odev_set_picture((struct asus_oled_dev *) dev_get_drvdata(device), buf, count);
572 }
573
574 #define ASUS_OLED_DEVICE_ATTR(_file) dev_attr_asus_oled_##_file
575
576 static DEVICE_ATTR(asus_oled_enabled, S_IWUGO | S_IRUGO, get_enabled, set_enabled);
577 static DEVICE_ATTR(asus_oled_picture, S_IWUGO , NULL, set_picture);
578
579 static DEVICE_ATTR(enabled, S_IWUGO | S_IRUGO, class_get_enabled, class_set_enabled);
580 static DEVICE_ATTR(picture, S_IWUGO, NULL, class_set_picture);
581
582 static int asus_oled_probe(struct usb_interface *interface, const struct usb_device_id *id)
583 {
584 struct usb_device *udev = interface_to_usbdev(interface);
585 struct asus_oled_dev *odev = NULL;
586 int retval = -ENOMEM;
587 uint16_t dev_width = 0;
588 oled_pack_mode_t pack_mode = PACK_MODE_LAST;
589 const struct oled_dev_desc_str * dev_desc = oled_dev_desc_table;
590 const char *desc = NULL;
591
592 if (!id) {
593 // Even possible? Just to make sure...
594 dev_err(&interface->dev, "No usb_device_id provided!\n");
595 return -ENODEV;
596 }
597
598 for (; dev_desc->idVendor; dev_desc++)
599 {
600 if (dev_desc->idVendor == id->idVendor
601 && dev_desc->idProduct == id->idProduct)
602 {
603 dev_width = dev_desc->devWidth;
604 desc = dev_desc->devDesc;
605 pack_mode = dev_desc->packMode;
606 break;
607 }
608 }
609
610 if (!desc || dev_width < 1 || pack_mode == PACK_MODE_LAST) {
611 dev_err(&interface->dev, "Missing or incomplete device description!\n");
612 return -ENODEV;
613 }
614
615 odev = kzalloc(sizeof(struct asus_oled_dev), GFP_KERNEL);
616
617 if (odev == NULL) {
618 dev_err(&interface->dev, "Out of memory\n");
619 return -ENOMEM;
620 }
621
622 odev->udev = usb_get_dev(udev);
623 odev->pic_mode = ASUS_OLED_STATIC;
624 odev->dev_width = dev_width;
625 odev->pack_mode = pack_mode;
626 odev->height = 0;
627 odev->width = 0;
628 odev->x_shift = 0;
629 odev->y_shift = 0;
630 odev->buf_offs = 0;
631 odev->buf_size = 0;
632 odev->last_val = 0;
633 odev->buf = NULL;
634 odev->enabled = 1;
635 odev->dev = NULL;
636
637 usb_set_intfdata(interface, odev);
638
639 retval = device_create_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled));
640 if (retval)
641 goto err_files;
642
643 retval = device_create_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
644 if (retval)
645 goto err_files;
646
647 odev->dev = device_create(oled_class, &interface->dev, MKDEV(0, 0),
648 NULL, "oled_%d", ++oled_num);
649
650 if (IS_ERR(odev->dev)) {
651 retval = PTR_ERR(odev->dev);
652 goto err_files;
653 }
654
655 dev_set_drvdata(odev->dev, odev);
656
657 retval = device_create_file(odev->dev, &dev_attr_enabled);
658 if (retval)
659 goto err_class_enabled;
660
661 retval = device_create_file(odev->dev, &dev_attr_picture);
662 if (retval)
663 goto err_class_picture;
664
665 dev_info(&interface->dev, "Attached Asus OLED device: %s [width %u, pack_mode %d]\n", desc, odev->dev_width, odev->pack_mode);
666
667 if (start_off)
668 enable_oled(odev, 0);
669
670 return 0;
671
672 err_class_picture:
673 device_remove_file(odev->dev, &dev_attr_picture);
674
675 err_class_enabled:
676 device_remove_file(odev->dev, &dev_attr_enabled);
677 device_unregister(odev->dev);
678
679 err_files:
680 device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled));
681 device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
682
683 usb_set_intfdata(interface, NULL);
684 usb_put_dev(odev->udev);
685 kfree(odev);
686
687 return retval;
688 }
689
690 static void asus_oled_disconnect(struct usb_interface *interface)
691 {
692 struct asus_oled_dev *odev;
693
694 odev = usb_get_intfdata(interface);
695 usb_set_intfdata(interface, NULL);
696
697 device_remove_file(odev->dev, &dev_attr_picture);
698 device_remove_file(odev->dev, &dev_attr_enabled);
699 device_unregister(odev->dev);
700
701 device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
702 device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled));
703
704 usb_put_dev(odev->udev);
705
706 if (odev->buf)
707 kfree(odev->buf);
708
709 kfree(odev);
710
711 dev_info(&interface->dev, "Disconnected Asus OLED device\n");
712 }
713
714 static struct usb_driver oled_driver = {
715 .name = ASUS_OLED_NAME,
716 .probe = asus_oled_probe,
717 .disconnect = asus_oled_disconnect,
718 .id_table = id_table,
719 };
720
721 static ssize_t version_show(struct class *dev, char *buf)
722 {
723 return sprintf(buf, ASUS_OLED_UNDERSCORE_NAME " %s\n", ASUS_OLED_VERSION);
724 }
725
726 static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
727
728 static int __init asus_oled_init(void)
729 {
730 int retval = 0;
731 oled_class = class_create(THIS_MODULE, ASUS_OLED_UNDERSCORE_NAME);
732
733 if (IS_ERR(oled_class)) {
734 err("Error creating " ASUS_OLED_UNDERSCORE_NAME " class");
735 return PTR_ERR(oled_class);
736 }
737
738 retval = class_create_file(oled_class, &class_attr_version);
739 if (retval) {
740 err("Error creating class version file");
741 goto error;
742 }
743
744 retval = usb_register(&oled_driver);
745
746 if (retval) {
747 err("usb_register failed. Error number %d", retval);
748 goto error;
749 }
750
751 return retval;
752
753 error:
754 class_destroy(oled_class);
755 return retval;
756 }
757
758 static void __exit asus_oled_exit(void)
759 {
760 class_remove_file(oled_class, &class_attr_version);
761 class_destroy(oled_class);
762
763 usb_deregister(&oled_driver);
764 }
765
766 module_init(asus_oled_init);
767 module_exit(asus_oled_exit);
768
Support for the Chinese Samsung S3C2440 based development boards