aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/video/metronomefb.c
blob: f30150d71be90bdd31aadbcd87beded46b8ae101 (plain) (blame)
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
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
/*
 * linux/drivers/video/metronomefb.c -- FB driver for Metronome controller
 *
 * Copyright (C) 2008, Jaya Kumar
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file COPYING in the main directory of this archive for
 * more details.
 *
 * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
 *
 * This work was made possible by help and equipment support from E-Ink
 * Corporation. http://www.eink.com/
 *
 * This driver is written to be used with the Metronome display controller.
 * It is intended to be architecture independent. A board specific driver
 * must be used to perform all the physical IO interactions. An example
 * is provided as am200epd.c
 *
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/list.h>
#include <linux/firmware.h>
#include <linux/dma-mapping.h>
#include <linux/uaccess.h>
#include <linux/irq.h>

#include <video/metronomefb.h>

#include <asm/unaligned.h>

/* Display specific information */
#define DPY_W 832
#define DPY_H 622

static int user_wfm_size;

/* frame differs from image. frame includes non-visible pixels */
struct epd_frame {
	int fw; /* frame width */
	int fh; /* frame height */
	u16 config[4];
	int wfm_size;
};

static struct epd_frame epd_frame_table[] = {
	{
		.fw = 832,
		.fh = 622,
		.config = {
			15 /* sdlew */
			| 2 << 8 /* sdosz */
			| 0 << 11 /* sdor */
			| 0 << 12 /* sdces */
			| 0 << 15, /* sdcer */
			42 /* gdspl */
			| 1 << 8 /* gdr1 */
			| 1 << 9 /* sdshr */
			| 0 << 15, /* gdspp */
			18 /* gdspw */
			| 0 << 15, /* dispc */
			599 /* vdlc */
			| 0 << 11 /* dsi */
			| 0 << 12, /* dsic */
		},
		.wfm_size = 47001,
	},
	{
		.fw = 1088,
		.fh = 791,
		.config = {
			0x0104,
			0x031f,
			0x0088,
			0x02ff,
		},
		.wfm_size = 46770,
	},
	{
		.fw = 1200,
		.fh = 842,
		.config = {
			0x0101,
			0x030e,
			0x0012,
			0x0280,
		},
		.wfm_size = 46770,
	},
};

static struct fb_fix_screeninfo metronomefb_fix = {
	.id =		"metronomefb",
	.type =		FB_TYPE_PACKED_PIXELS,
	.visual =	FB_VISUAL_STATIC_PSEUDOCOLOR,
	.xpanstep =	0,
	.ypanstep =	0,
	.ywrapstep =	0,
	.line_length =	DPY_W,
	.accel =	FB_ACCEL_NONE,
};

static struct fb_var_screeninfo metronomefb_var = {
	.xres		= DPY_W,
	.yres		= DPY_H,
	.xres_virtual	= DPY_W,
	.yres_virtual	= DPY_H,
	.bits_per_pixel	= 8,
	.grayscale	= 1,
	.nonstd		= 1,
	.red =		{ 4, 3, 0 },
	.green =	{ 0, 0, 0 },
	.blue =		{ 0, 0, 0 },
	.transp =	{ 0, 0, 0 },
};

/* the waveform structure that is coming from userspace firmware */
struct waveform_hdr {
	u8 stuff[32];

	u8 wmta[3];
	u8 fvsn;

	u8 luts;
	u8 mc;
	u8 trc;
	u8 stuff3;

	u8 endb;
	u8 swtb;
	u8 stuff2a[2];

	u8 stuff2b[3];
	u8 wfm_cs;
} __attribute__ ((packed));

/* main metronomefb functions */
static u8 calc_cksum(int start, int end, u8 *mem)
{
	u8 tmp = 0;
	int i;

	for (i = start; i < end; i++)
		tmp += mem[i];

	return tmp;
}

static u16 calc_img_cksum(u16 *start, int length)
{
	u16 tmp = 0;

	while (length--)
		tmp += *start++;

	return tmp;
}

/* here we decode the incoming waveform file and populate metromem */
static int load_waveform(u8 *mem, size_t size, int m, int t,
			 struct metronomefb_par *par)
{
	int tta;
	int wmta;
	int trn = 0;
	int i;
	unsigned char v;
	u8 cksum;
	int cksum_idx;
	int wfm_idx, owfm_idx;
	int mem_idx = 0;
	struct waveform_hdr *wfm_hdr;
	u8 *metromem = par->metromem_wfm;
	struct device *dev = par->info->dev;

	if (user_wfm_size)
		epd_frame_table[par->dt].wfm_size = user_wfm_size;

	if (size != epd_frame_table[par->dt].wfm_size) {
		dev_err(dev, "Error: unexpected size %Zd != %d\n", size,
					epd_frame_table[par->dt].wfm_size);
		return -EINVAL;
	}

	wfm_hdr = (struct waveform_hdr *) mem;

	if (wfm_hdr->fvsn != 1) {
		dev_err(dev, "Error: bad fvsn %x\n", wfm_hdr->fvsn);
		return -EINVAL;
	}
	if (wfm_hdr->luts != 0) {
		dev_err(dev, "Error: bad luts %x\n", wfm_hdr->luts);
		return -EINVAL;
	}
	cksum = calc_cksum(32, 47, mem);
	if (cksum != wfm_hdr->wfm_cs) {
		dev_err(dev, "Error: bad cksum %x != %x\n", cksum,
					wfm_hdr->wfm_cs);
		return -EINVAL;
	}
	wfm_hdr->mc += 1;
	wfm_hdr->trc += 1;
	for (i = 0; i < 5; i++) {
		if (*(wfm_hdr->stuff2a + i) != 0) {
			dev_err(dev, "Error: unexpected value in padding\n");
			return -EINVAL;
		}
	}

	/* calculating trn. trn is something used to index into
	the waveform. presumably selecting the right one for the
	desired temperature. it works out the offset of the first
	v that exceeds the specified temperature */
	if ((sizeof(*wfm_hdr) + wfm_hdr->trc) > size)
		return -EINVAL;

	for (i = sizeof(*wfm_hdr); i <= sizeof(*wfm_hdr) + wfm_hdr->trc; i++) {
		if (mem[i] > t) {
			trn = i - sizeof(*wfm_hdr) - 1;
			break;
		}
	}

	/* check temperature range table checksum */
	cksum_idx = sizeof(*wfm_hdr) + wfm_hdr->trc + 1;
	if (cksum_idx > size)
		return -EINVAL;
	cksum = calc_cksum(sizeof(*wfm_hdr), cksum_idx, mem);
	if (cksum != mem[cksum_idx]) {
		dev_err(dev, "Error: bad temperature range table cksum"
				" %x != %x\n", cksum, mem[cksum_idx]);
		return -EINVAL;
	}

	/* check waveform mode table address checksum */
	wmta = get_unaligned_le32(wfm_hdr->wmta) & 0x00FFFFFF;
	cksum_idx = wmta + m*4 + 3;
	if (cksum_idx > size)
		return -EINVAL;
	cksum = calc_cksum(cksum_idx - 3, cksum_idx, mem);
	if (cksum != mem[cksum_idx]) {
		dev_err(dev, "Error: bad mode table address cksum"
				" %x != %x\n", cksum, mem[cksum_idx]);
		return -EINVAL;
	}

	/* check waveform temperature table address checksum */
	tta = get_unaligned_le32(mem + wmta + m * 4) & 0x00FFFFFF;
	cksum_idx = tta + trn*4 + 3;
	if (cksum_idx > size)
		return -EINVAL;
	cksum = calc_cksum(cksum_idx - 3, cksum_idx, mem);
	if (cksum != mem[cksum_idx]) {
		dev_err(dev, "Error: bad temperature table address cksum"
			" %x != %x\n", cksum, mem[cksum_idx]);
		return -EINVAL;
	}

	/* here we do the real work of putting the waveform into the
	metromem buffer. this does runlength decoding of the waveform */
	wfm_idx = get_unaligned_le32(mem + tta + trn * 4) & 0x00FFFFFF;
	owfm_idx = wfm_idx;
	if (wfm_idx > size)
		return -EINVAL;
	while (wfm_idx < size) {
		unsigned char rl;
		v = mem[wfm_idx++];
		if (v == wfm_hdr->swtb) {
			while (((v = mem[wfm_idx++]) != wfm_hdr->swtb) &&
				wfm_idx < size)
				metromem[mem_idx++] = v;

			continue;
		}

		if (v == wfm_hdr->endb)
			break;

		rl = mem[wfm_idx++];
		for (i = 0; i <= rl; i++)
			metromem[mem_idx++] = v;
	}

	cksum_idx = wfm_idx;
	if (cksum_idx > size)
		return -EINVAL;
	cksum = calc_cksum(owfm_idx, cksum_idx, mem);
	if (cksum != mem[cksum_idx]) {
		dev_err(dev, "Error: bad waveform data cksum"
				" %x != %x\n", cksum, mem[cksum_idx]);
		return -EINVAL;
	}
	par->frame_count = (mem_idx/64);

	return 0;
}

static int metronome_display_cmd(struct metronomefb_par *par)
{
	int i;
	u16 cs;
	u16 opcode;
	static u8 borderval;

	/* setup display command
	we can't immediately set the opcode since the controller
	will try parse the command before we've set it all up
	so we just set cs here and set the opcode at the end */

	if (par->metromem_cmd->opcode == 0xCC40)
		opcode = cs = 0xCC41;
	else
		opcode = cs = 0xCC40;

	/* set the args ( 2 bytes ) for display */
	i = 0;
	par->metromem_cmd->args[i] = 	1 << 3 /* border update */
					| ((borderval++ % 4) & 0x0F) << 4
					| (par->frame_count - 1) << 8;
	cs += par->metromem_cmd->args[i++];

	/* the rest are 0 */
	memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2);

	par->metromem_cmd->csum = cs;
	par->metromem_cmd->opcode = opcode; /* display cmd */

	return par->board->met_wait_event_intr(par);
}

static int metronome_powerup_cmd(struct metronomefb_par *par)
{
	int i;
	u16 cs;

	/* setup power up command */
	par->metromem_cmd->opcode = 0x1234; /* pwr up pseudo cmd */
	cs = par->metromem_cmd->opcode;

	/* set pwr1,2,3 to 1024 */
	for (i = 0; i < 3; i++) {
		par->metromem_cmd->args[i] = 1024;
		cs += par->metromem_cmd->args[i];
	}

	/* the rest are 0 */
	memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2);

	par->metromem_cmd->csum = cs;

	msleep(1);
	par->board->set_rst(par, 1);

	msleep(1);
	par->board->set_stdby(par, 1);

	return par->board->met_wait_event(par);
}

static int metronome_config_cmd(struct metronomefb_par *par)
{
	/* setup config command
	we can't immediately set the opcode since the controller
	will try parse the command before we've set it all up */

	memcpy(par->metromem_cmd->args, epd_frame_table[par->dt].config,
		sizeof(epd_frame_table[par->dt].config));
	/* the rest are 0 */
	memset((u8 *) (par->metromem_cmd->args + 4), 0, (32-4)*2);

	par->metromem_cmd->csum = 0xCC10;
	par->metromem_cmd->csum += calc_img_cksum(par->metromem_cmd->args, 4);
	par->metromem_cmd->opcode = 0xCC10; /* config cmd */

	return par->board->met_wait_event(par);
}

static int metronome_init_cmd(struct metronomefb_par *par)
{
	int i;
	u16 cs;

	/* setup init command
	we can't immediately set the opcode since the controller
	will try parse the command before we've set it all up
	so we just set cs here and set the opcode at the end */

	cs = 0xCC20;

	/* set the args ( 2 bytes ) for init */
	i = 0;
	par->metromem_cmd->args[i] = 0;
	cs += par->metromem_cmd->args[i++];

	/* the rest are 0 */
	memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2);

	par->metromem_cmd->csum = cs;
	par->metromem_cmd->opcode = 0xCC20; /* init cmd */

	return par->board->met_wait_event(par);
}

static int metronome_init_regs(struct metronomefb_par *par)
{
	int res;

	res = par->board->setup_io(par);
	if (res)
		return res;

	res = metronome_powerup_cmd(par);
	if (res)
		return res;

	res = metronome_config_cmd(par);
	if (res)
		return res;

	res = metronome_init_cmd(par);

	return res;
}

static void metronomefb_dpy_update(struct metronomefb_par *par)
{
	int fbsize;
	u16 cksum;
	unsigned char *buf = (unsigned char __force *)par->info->screen_base;

	fbsize = par->info->fix.smem_len;
	/* copy from vm to metromem */
	memcpy(par->metromem_img, buf, fbsize);

	cksum = calc_img_cksum((u16 *) par->metromem_img, fbsize/2);
	*((u16 *)(par->metromem_img) + fbsize/2) = cksum;
	metronome_display_cmd(par);
}

static u16 metronomefb_dpy_update_page(struct metronomefb_par *par, int index)
{
	int i;
	u16 csum = 0;
	u16 *buf = (u16 __force *)(par->info->screen_base + index);
	u16 *img = (u16 *)(par->metromem_img + index);

	/* swizzle from vm to metromem and recalc cksum at the same time*/
	for (i = 0; i < PAGE_SIZE/2; i++) {
		*(img + i) = (buf[i] << 5) & 0xE0E0;
		csum += *(img + i);
	}
	return csum;
}

/* this is called back from the deferred io workqueue */
static void metronomefb_dpy_deferred_io(struct fb_info *info,
				struct list_head *pagelist)
{
	u16 cksum;
	struct page *cur;
	struct fb_deferred_io *fbdefio = info->fbdefio;
	struct metronomefb_par *par = info->par;

	/* walk the written page list and swizzle the data */
	list_for_each_entry(cur, &fbdefio->pagelist, lru) {
		cksum = metronomefb_dpy_update_page(par,
					(cur->index << PAGE_SHIFT));
		par->metromem_img_csum -= par->csum_table[cur->index];
		par->csum_table[cur->index] = cksum;
		par->metromem_img_csum += cksum;
	}

	metronome_display_cmd(par);
}

static void metronomefb_fillrect(struct fb_info *info,
				   const struct fb_fillrect *rect)
{
	struct metronomefb_par *par = info->par;

	sys_fillrect(info, rect);
	metronomefb_dpy_update(par);
}

static void metronomefb_copyarea(struct fb_info *info,
				   const struct fb_copyarea *area)
{
	struct metronomefb_par *par = info->par;

	sys_copyarea(info, area);
	metronomefb_dpy_update(par);
}

static void metronomefb_imageblit(struct fb_info *info,
				const struct fb_image *image)
{
	struct metronomefb_par *par = info->par;

	sys_imageblit(info, image);
	metronomefb_dpy_update(par);
}

/*
 * this is the slow path from userspace. they can seek and write to
 * the fb. it is based on fb_sys_write
 */
static ssize_t metronomefb_write(struct fb_info *info, const char __user *buf,
				size_t count, loff_t *ppos)
{
	struct metronomefb_par *par = info->par;
	unsigned long p = *ppos;
	void *dst;
	int err = 0;
	unsigned long total_size;

	if (info->state != FBINFO_STATE_RUNNING)
		return -EPERM;

	total_size = info->fix.smem_len;

	if (p > total_size)
		return -EFBIG;

	if (count > total_size) {
		err = -EFBIG;
		count = total_size;
	}

	if (count + p > total_size) {
		if (!err)
			err = -ENOSPC;

		count = total_size - p;
	}

	dst = (void __force *)(info->screen_base + p);

	if (copy_from_user(dst, buf, count))
		err = -EFAULT;

	if  (!err)
		*ppos += count;

	metronomefb_dpy_update(par);

	return (err) ? err : count;
}

static struct fb_ops metronomefb_ops = {
	.owner		= THIS_MODULE,
	.fb_write	= metronomefb_write,
	.fb_fillrect	= metronomefb_fillrect,
	.fb_copyarea	= metronomefb_copyarea,
	.fb_imageblit	= metronomefb_imageblit,
};

static struct fb_deferred_io metronomefb_defio = {
	.delay		= HZ,
	.deferred_io	= metronomefb_dpy_deferred_io,
};

static int metronomefb_probe(struct platform_device *dev)
{
	struct fb_info *info;
	struct metronome_board *board;
	int retval = -ENOMEM;
	int videomemorysize;
	unsigned char *videomemory;
	struct metronomefb_par *par;
	const struct firmware *fw_entry;
	int i;
	int panel_type;
	int fw, fh;
	int epd_dt_index;

	/* pick up board specific routines */
	board = dev->dev.platform_data;
	if (!board)
		return -EINVAL;

	/* try to count device specific driver, if can't, platform recalls */
	if (!try_module_get(board->owner))
		return -ENODEV;

	info = framebuffer_alloc(sizeof(struct metronomefb_par), &dev->dev);
	if (!info)
		goto err;

	/* we have two blocks of memory.
	info->screen_base which is vm, and is the fb used by apps.
	par->metromem which is physically contiguous memory and
	contains the display controller commands, waveform,
	processed image data and padding. this is the data pulled
	by the device's LCD controller and pushed to Metronome.
	the metromem memory is allocated by the board driver and
	is provided to us */

	panel_type = board->get_panel_type();
	switch (panel_type) {
	case 6:
		epd_dt_index = 0;
		break;
	case 8:
		epd_dt_index = 1;
		break;
	case 97:
		epd_dt_index = 2;
		break;
	default:
		dev_err(&dev->dev, "Unexpected panel type. Defaulting to 6\n");
		epd_dt_index = 0;
		break;
	}

	fw = epd_frame_table[epd_dt_index].fw;
	fh = epd_frame_table[epd_dt_index].fh;

	/* we need to add a spare page because our csum caching scheme walks
	 * to the end of the page */
	videomemorysize = PAGE_SIZE + (fw * fh);
	videomemory = vzalloc(videomemorysize);
	if (!videomemory)
		goto err_fb_rel;

	info->screen_base = (char __force __iomem *)videomemory;
	info->fbops = &metronomefb_ops;

	metronomefb_fix.line_length = fw;
	metronomefb_var.xres = fw;
	metronomefb_var.yres = fh;
	metronomefb_var.xres_virtual = fw;
	metronomefb_var.yres_virtual = fh;
	info->var = metronomefb_var;
	info->fix = metronomefb_fix;
	info->fix.smem_len = videomemorysize;
	par = info->par;
	par->info = info;
	par->board = board;
	par->dt = epd_dt_index;
	init_waitqueue_head(&par->waitq);

	/* this table caches per page csum values. */
	par->csum_table = vmalloc(videomemorysize/PAGE_SIZE);
	if (!par->csum_table)
		goto err_vfree;

	/* the physical framebuffer that we use is setup by
	 * the platform device driver. It will provide us
	 * with cmd, wfm and image memory in a contiguous area. */
	retval = board->setup_fb(par);
	if (retval) {
		dev_err(&dev->dev, "Failed to setup fb\n");
		goto err_csum_table;
	}

	/* after this point we should have a framebuffer */
	if ((!par->metromem_wfm) ||  (!par->metromem_img) ||
		(!par->metromem_dma)) {
		dev_err(&dev->dev, "fb access failure\n");
		retval = -EINVAL;
		goto err_csum_table;
	}

	info->fix.smem_start = par->metromem_dma;

	/* load the waveform in. assume mode 3, temp 31 for now
		a) request the waveform file from userspace
		b) process waveform and decode into metromem */
	retval = request_firmware(&fw_entry, "metronome.wbf", &dev->dev);
	if (retval < 0) {
		dev_err(&dev->dev, "Failed to get waveform\n");
		goto err_csum_table;
	}

	retval = load_waveform((u8 *) fw_entry->data, fw_entry->size, 3, 31,
				par);
	release_firmware(fw_entry);
	if (retval < 0) {
		dev_err(&dev->dev, "Failed processing waveform\n");
		goto err_csum_table;
	}

	if (board->setup_irq(info))
		goto err_csum_table;

	retval = metronome_init_regs(par);
	if (retval < 0)
		goto err_free_irq;

	info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB;

	info->fbdefio = &metronomefb_defio;
	fb_deferred_io_init(info);

	retval = fb_alloc_cmap(&info->cmap, 8, 0);
	if (retval < 0) {
		dev_err(&dev->dev, "Failed to allocate colormap\n");
		goto err_free_irq;
	}

	/* set cmap */
	for (i = 0; i < 8; i++)
		info->cmap.red[i] = (((2*i)+1)*(0xFFFF))/16;
	memcpy(info->cmap.green, info->cmap.red, sizeof(u16)*8);
	memcpy(info->cmap.blue, info->cmap.red, sizeof(u16)*8);

	retval = register_framebuffer(info);
	if (retval < 0)
		goto err_cmap;

	platform_set_drvdata(dev, info);

	dev_dbg(&dev->dev,
		"fb%d: Metronome frame buffer device, using %dK of video"
		" memory\n", info->node, videomemorysize >> 10);

	return 0;

err_cmap:
	fb_dealloc_cmap(&info->cmap);
err_free_irq:
	board->cleanup(par);
err_csum_table:
	vfree(par->csum_table);
err_vfree:
	vfree(videomemory);
err_fb_rel:
	framebuffer_release(info);
err:
	module_put(board->owner);
	return retval;
}

static int metronomefb_remove(struct platform_device *dev)
{
	struct fb_info *info = platform_get_drvdata(dev);

	if (info) {
		struct metronomefb_par *par = info->par;

		unregister_framebuffer(info);
		fb_deferred_io_cleanup(info);
		fb_dealloc_cmap(&info->cmap);
		par->board->cleanup(par);
		vfree(par->csum_table);
		vfree((void __force *)info->screen_base);
		module_put(par->board->owner);
		dev_dbg(&dev->dev, "calling release\n");
		framebuffer_release(info);
	}
	return 0;
}

static struct platform_driver metronomefb_driver = {
	.probe	= metronomefb_probe,
	.remove = metronomefb_remove,
	.driver	= {
		.owner	= THIS_MODULE,
		.name	= "metronomefb",
	},
};

static int __init metronomefb_init(void)
{
	return platform_driver_register(&metronomefb_driver);
}

static void __exit metronomefb_exit(void)
{
	platform_driver_unregister(&metronomefb_driver);
}

module_param(user_wfm_size, uint, 0);
MODULE_PARM_DESC(user_wfm_size, "Set custom waveform size");

module_init(metronomefb_init);
module_exit(metronomefb_exit);

MODULE_DESCRIPTION("fbdev driver for Metronome controller");
MODULE_AUTHOR("Jaya Kumar");
MODULE_LICENSE("GPL");