Free Electrons

Embedded Linux Experts

   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
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
/*
    On Screen Display cx23415 Framebuffer driver

    This module presents the cx23415 OSD (onscreen display) framebuffer memory
    as a standard Linux /dev/fb style framebuffer device. The framebuffer has
    support for 8, 16 & 32 bpp packed pixel formats with alpha channel. In 16bpp
    mode, there is a choice of a three color depths (12, 15 or 16 bits), but no
    local alpha. The colorspace is selectable between rgb & yuv.
    Depending on the TV standard configured in the ivtv module at load time,
    the initial resolution is either 640x400 (NTSC) or 640x480 (PAL) at 8bpp.
    Video timings are locked to ensure a vertical refresh rate of 50Hz (PAL)
    or 59.94 (NTSC)

    Copyright (c) 2003 Matt T. Yourst <yourst@yourst.com>

    Derived from drivers/video/vesafb.c
    Portions (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>

    2.6 kernel port:
    Copyright (C) 2004 Matthias Badaire

    Copyright (C) 2004  Chris Kennedy <c@groovy.org>

    Copyright (C) 2006  Ian Armstrong <ian@iarmst.demon.co.uk>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fb.h>
#include <linux/ivtvfb.h>
#include <linux/slab.h>

#ifdef CONFIG_MTRR
#include <asm/mtrr.h>
#endif

#include "ivtv-driver.h"
#include "ivtv-cards.h"
#include "ivtv-i2c.h"
#include "ivtv-udma.h"
#include "ivtv-mailbox.h"
#include "ivtv-firmware.h"

/* card parameters */
static int ivtvfb_card_id = -1;
static int ivtvfb_debug = 0;
static bool osd_laced;
static int osd_depth;
static int osd_upper;
static int osd_left;
static int osd_yres;
static int osd_xres;

module_param(ivtvfb_card_id, int, 0444);
module_param_named(debug,ivtvfb_debug, int, 0644);
module_param(osd_laced, bool, 0444);
module_param(osd_depth, int, 0444);
module_param(osd_upper, int, 0444);
module_param(osd_left, int, 0444);
module_param(osd_yres, int, 0444);
module_param(osd_xres, int, 0444);

MODULE_PARM_DESC(ivtvfb_card_id,
		 "Only use framebuffer of the specified ivtv card (0-31)\n"
		 "\t\t\tdefault -1: initialize all available framebuffers");

MODULE_PARM_DESC(debug,
		 "Debug level (bitmask). Default: errors only\n"
		 "\t\t\t(debug = 3 gives full debugging)");

/* Why upper, left, xres, yres, depth, laced ? To match terminology used
   by fbset.
   Why start at 1 for left & upper coordinate ? Because X doesn't allow 0 */

MODULE_PARM_DESC(osd_laced,
		 "Interlaced mode\n"
		 "\t\t\t0=off\n"
		 "\t\t\t1=on\n"
		 "\t\t\tdefault off");

MODULE_PARM_DESC(osd_depth,
		 "Bits per pixel - 8, 16, 32\n"
		 "\t\t\tdefault 8");

MODULE_PARM_DESC(osd_upper,
		 "Vertical start position\n"
		 "\t\t\tdefault 0 (Centered)");

MODULE_PARM_DESC(osd_left,
		 "Horizontal start position\n"
		 "\t\t\tdefault 0 (Centered)");

MODULE_PARM_DESC(osd_yres,
		 "Display height\n"
		 "\t\t\tdefault 480 (PAL)\n"
		 "\t\t\t        400 (NTSC)");

MODULE_PARM_DESC(osd_xres,
		 "Display width\n"
		 "\t\t\tdefault 640");

MODULE_AUTHOR("Kevin Thayer, Chris Kennedy, Hans Verkuil, John Harvey, Ian Armstrong");
MODULE_LICENSE("GPL");

/* --------------------------------------------------------------------- */

#define IVTVFB_DBGFLG_WARN  (1 << 0)
#define IVTVFB_DBGFLG_INFO  (1 << 1)

#define IVTVFB_DEBUG(x, type, fmt, args...) \
	do { \
		if ((x) & ivtvfb_debug) \
			printk(KERN_INFO "ivtvfb%d " type ": " fmt, itv->instance , ## args); \
	} while (0)
#define IVTVFB_DEBUG_WARN(fmt, args...)  IVTVFB_DEBUG(IVTVFB_DBGFLG_WARN, "warning", fmt , ## args)
#define IVTVFB_DEBUG_INFO(fmt, args...)  IVTVFB_DEBUG(IVTVFB_DBGFLG_INFO, "info", fmt , ## args)

/* Standard kernel messages */
#define IVTVFB_ERR(fmt, args...)   printk(KERN_ERR  "ivtvfb%d: " fmt, itv->instance , ## args)
#define IVTVFB_WARN(fmt, args...)  printk(KERN_WARNING  "ivtvfb%d: " fmt, itv->instance , ## args)
#define IVTVFB_INFO(fmt, args...)  printk(KERN_INFO "ivtvfb%d: " fmt, itv->instance , ## args)

/* --------------------------------------------------------------------- */

#define IVTV_OSD_MAX_WIDTH  720
#define IVTV_OSD_MAX_HEIGHT 576

#define IVTV_OSD_BPP_8      0x00
#define IVTV_OSD_BPP_16_444 0x03
#define IVTV_OSD_BPP_16_555 0x02
#define IVTV_OSD_BPP_16_565 0x01
#define IVTV_OSD_BPP_32     0x04

struct osd_info {
	/* Physical base address */
	unsigned long video_pbase;
	/* Relative base address (relative to start of decoder memory) */
	u32 video_rbase;
	/* Mapped base address */
	volatile char __iomem *video_vbase;
	/* Buffer size */
	u32 video_buffer_size;

#ifdef CONFIG_MTRR
	/* video_base rounded down as required by hardware MTRRs */
	unsigned long fb_start_aligned_physaddr;
	/* video_base rounded up as required by hardware MTRRs */
	unsigned long fb_end_aligned_physaddr;
#endif

	/* Store the buffer offset */
	int set_osd_coords_x;
	int set_osd_coords_y;

	/* Current dimensions (NOT VISIBLE SIZE!) */
	int display_width;
	int display_height;
	int display_byte_stride;

	/* Current bits per pixel */
	int bits_per_pixel;
	int bytes_per_pixel;

	/* Frame buffer stuff */
	struct fb_info ivtvfb_info;
	struct fb_var_screeninfo ivtvfb_defined;
	struct fb_fix_screeninfo ivtvfb_fix;

	/* Used for a warm start */
	struct fb_var_screeninfo fbvar_cur;
	int blank_cur;
	u32 palette_cur[256];
	u32 pan_cur;
};

struct ivtv_osd_coords {
	unsigned long offset;
	unsigned long max_offset;
	int pixel_stride;
	int lines;
	int x;
	int y;
};

/* --------------------------------------------------------------------- */

/* ivtv API calls for framebuffer related support */

static int ivtvfb_get_framebuffer(struct ivtv *itv, u32 *fbbase,
				       u32 *fblength)
{
	u32 data[CX2341X_MBOX_MAX_DATA];
	int rc;

	ivtv_firmware_check(itv, "ivtvfb_get_framebuffer");
	rc = ivtv_vapi_result(itv, data, CX2341X_OSD_GET_FRAMEBUFFER, 0);
	*fbbase = data[0];
	*fblength = data[1];
	return rc;
}

static int ivtvfb_get_osd_coords(struct ivtv *itv,
				      struct ivtv_osd_coords *osd)
{
	struct osd_info *oi = itv->osd_info;
	u32 data[CX2341X_MBOX_MAX_DATA];

	ivtv_vapi_result(itv, data, CX2341X_OSD_GET_OSD_COORDS, 0);

	osd->offset = data[0] - oi->video_rbase;
	osd->max_offset = oi->display_width * oi->display_height * 4;
	osd->pixel_stride = data[1];
	osd->lines = data[2];
	osd->x = data[3];
	osd->y = data[4];
	return 0;
}

static int ivtvfb_set_osd_coords(struct ivtv *itv, const struct ivtv_osd_coords *osd)
{
	struct osd_info *oi = itv->osd_info;

	oi->display_width = osd->pixel_stride;
	oi->display_byte_stride = osd->pixel_stride * oi->bytes_per_pixel;
	oi->set_osd_coords_x += osd->x;
	oi->set_osd_coords_y = osd->y;

	return ivtv_vapi(itv, CX2341X_OSD_SET_OSD_COORDS, 5,
			osd->offset + oi->video_rbase,
			osd->pixel_stride,
			osd->lines, osd->x, osd->y);
}

static int ivtvfb_set_display_window(struct ivtv *itv, struct v4l2_rect *ivtv_window)
{
	int osd_height_limit = itv->is_out_50hz ? 576 : 480;

	/* Only fail if resolution too high, otherwise fudge the start coords. */
	if ((ivtv_window->height > osd_height_limit) || (ivtv_window->width > IVTV_OSD_MAX_WIDTH))
		return -EINVAL;

	/* Ensure we don't exceed display limits */
	if (ivtv_window->top + ivtv_window->height > osd_height_limit) {
		IVTVFB_DEBUG_WARN("ivtv_ioctl_fb_set_display_window - Invalid height setting (%d, %d)\n",
			ivtv_window->top, ivtv_window->height);
		ivtv_window->top = osd_height_limit - ivtv_window->height;
	}

	if (ivtv_window->left + ivtv_window->width > IVTV_OSD_MAX_WIDTH) {
		IVTVFB_DEBUG_WARN("ivtv_ioctl_fb_set_display_window - Invalid width setting (%d, %d)\n",
			ivtv_window->left, ivtv_window->width);
		ivtv_window->left = IVTV_OSD_MAX_WIDTH - ivtv_window->width;
	}

	/* Set the OSD origin */
	write_reg((ivtv_window->top << 16) | ivtv_window->left, 0x02a04);

	/* How much to display */
	write_reg(((ivtv_window->top+ivtv_window->height) << 16) | (ivtv_window->left+ivtv_window->width), 0x02a08);

	/* Pass this info back the yuv handler */
	itv->yuv_info.osd_vis_w = ivtv_window->width;
	itv->yuv_info.osd_vis_h = ivtv_window->height;
	itv->yuv_info.osd_x_offset = ivtv_window->left;
	itv->yuv_info.osd_y_offset = ivtv_window->top;

	return 0;
}

static int ivtvfb_prep_dec_dma_to_device(struct ivtv *itv,
				  unsigned long ivtv_dest_addr, void __user *userbuf,
				  int size_in_bytes)
{
	DEFINE_WAIT(wait);
	int got_sig = 0;

	mutex_lock(&itv->udma.lock);
	/* Map User DMA */
	if (ivtv_udma_setup(itv, ivtv_dest_addr, userbuf, size_in_bytes) <= 0) {
		mutex_unlock(&itv->udma.lock);
		IVTVFB_WARN("ivtvfb_prep_dec_dma_to_device, "
			       "Error with get_user_pages: %d bytes, %d pages returned\n",
			       size_in_bytes, itv->udma.page_count);

		/* get_user_pages must have failed completely */
		return -EIO;
	}

	IVTVFB_DEBUG_INFO("ivtvfb_prep_dec_dma_to_device, %d bytes, %d pages\n",
		       size_in_bytes, itv->udma.page_count);

	ivtv_udma_prepare(itv);
	prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
	/* if no UDMA is pending and no UDMA is in progress, then the DMA
	   is finished */
	while (test_bit(IVTV_F_I_UDMA_PENDING, &itv->i_flags) ||
	       test_bit(IVTV_F_I_UDMA, &itv->i_flags)) {
		/* don't interrupt if the DMA is in progress but break off
		   a still pending DMA. */
		got_sig = signal_pending(current);
		if (got_sig && test_and_clear_bit(IVTV_F_I_UDMA_PENDING, &itv->i_flags))
			break;
		got_sig = 0;
		schedule();
	}
	finish_wait(&itv->dma_waitq, &wait);

	/* Unmap Last DMA Xfer */
	ivtv_udma_unmap(itv);
	mutex_unlock(&itv->udma.lock);
	if (got_sig) {
		IVTV_DEBUG_INFO("User stopped OSD\n");
		return -EINTR;
	}

	return 0;
}

static int ivtvfb_prep_frame(struct ivtv *itv, int cmd, void __user *source,
			      unsigned long dest_offset, int count)
{
	DEFINE_WAIT(wait);
	struct osd_info *oi = itv->osd_info;

	/* Nothing to do */
	if (count == 0) {
		IVTVFB_DEBUG_WARN("ivtvfb_prep_frame: Nothing to do. count = 0\n");
		return -EINVAL;
	}

	/* Check Total FB Size */
	if ((dest_offset + count) > oi->video_buffer_size) {
		IVTVFB_WARN("ivtvfb_prep_frame: Overflowing the framebuffer %ld, only %d available\n",
			dest_offset + count, oi->video_buffer_size);
		return -E2BIG;
	}

	/* Not fatal, but will have undesirable results */
	if ((unsigned long)source & 3)
		IVTVFB_WARN("ivtvfb_prep_frame: Source address not 32 bit aligned (0x%08lx)\n",
			(unsigned long)source);

	if (dest_offset & 3)
		IVTVFB_WARN("ivtvfb_prep_frame: Dest offset not 32 bit aligned (%ld)\n", dest_offset);

	if (count & 3)
		IVTVFB_WARN("ivtvfb_prep_frame: Count not a multiple of 4 (%d)\n", count);

	/* Check Source */
	if (!access_ok(VERIFY_READ, source + dest_offset, count)) {
		IVTVFB_WARN("Invalid userspace pointer 0x%08lx\n",
			(unsigned long)source);

		IVTVFB_DEBUG_WARN("access_ok() failed for offset 0x%08lx source 0x%08lx count %d\n",
			dest_offset, (unsigned long)source,
			count);
		return -EINVAL;
	}

	/* OSD Address to send DMA to */
	dest_offset += IVTV_DECODER_OFFSET + oi->video_rbase;

	/* Fill Buffers */
	return ivtvfb_prep_dec_dma_to_device(itv, dest_offset, source, count);
}

static ssize_t ivtvfb_write(struct fb_info *info, const char __user *buf,
						size_t count, loff_t *ppos)
{
	unsigned long p = *ppos;
	void *dst;
	int err = 0;
	int dma_err;
	unsigned long total_size;
	struct ivtv *itv = (struct ivtv *) info->par;
	unsigned long dma_offset =
			IVTV_DECODER_OFFSET + itv->osd_info->video_rbase;
	unsigned long dma_size;
	u16 lead = 0, tail = 0;

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

	total_size = info->screen_size;

	if (total_size == 0)
		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 (info->fbops->fb_sync)
		info->fbops->fb_sync(info);

	/* If transfer size > threshold and both src/dst
	addresses are aligned, use DMA */
	if (count >= 4096 &&
	    ((unsigned long)buf & 3) == ((unsigned long)dst & 3)) {
		/* Odd address = can't DMA. Align */
		if ((unsigned long)dst & 3) {
			lead = 4 - ((unsigned long)dst & 3);
			if (copy_from_user(dst, buf, lead))
				return -EFAULT;
			buf += lead;
			dst += lead;
		}
		/* DMA resolution is 32 bits */
		if ((count - lead) & 3)
			tail = (count - lead) & 3;
		/* DMA the data */
		dma_size = count - lead - tail;
		dma_err = ivtvfb_prep_dec_dma_to_device(itv,
		       p + lead + dma_offset, (void __user *)buf, dma_size);
		if (dma_err)
			return dma_err;
		dst += dma_size;
		buf += dma_size;
		/* Copy any leftover data */
		if (tail && copy_from_user(dst, buf, tail))
			return -EFAULT;
	} else if (copy_from_user(dst, buf, count)) {
		return -EFAULT;
	}

	if  (!err)
		*ppos += count;

	return (err) ? err : count;
}

static int ivtvfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
{
	DEFINE_WAIT(wait);
	struct ivtv *itv = (struct ivtv *)info->par;
	int rc = 0;

	switch (cmd) {
		case FBIOGET_VBLANK: {
			struct fb_vblank vblank;
			u32 trace;

			memset(&vblank, 0, sizeof(struct fb_vblank));

			vblank.flags = FB_VBLANK_HAVE_COUNT |FB_VBLANK_HAVE_VCOUNT |
					FB_VBLANK_HAVE_VSYNC;
			trace = read_reg(IVTV_REG_DEC_LINE_FIELD) >> 16;
			if (itv->is_out_50hz && trace > 312)
				trace -= 312;
			else if (itv->is_out_60hz && trace > 262)
				trace -= 262;
			if (trace == 1)
				vblank.flags |= FB_VBLANK_VSYNCING;
			vblank.count = itv->last_vsync_field;
			vblank.vcount = trace;
			vblank.hcount = 0;
			if (copy_to_user((void __user *)arg, &vblank, sizeof(vblank)))
				return -EFAULT;
			return 0;
		}

		case FBIO_WAITFORVSYNC:
			prepare_to_wait(&itv->vsync_waitq, &wait, TASK_INTERRUPTIBLE);
			if (!schedule_timeout(msecs_to_jiffies(50)))
				rc = -ETIMEDOUT;
			finish_wait(&itv->vsync_waitq, &wait);
			return rc;

		case IVTVFB_IOC_DMA_FRAME: {
			struct ivtvfb_dma_frame args;

			IVTVFB_DEBUG_INFO("IVTVFB_IOC_DMA_FRAME\n");
			if (copy_from_user(&args, (void __user *)arg, sizeof(args)))
				return -EFAULT;

			return ivtvfb_prep_frame(itv, cmd, args.source, args.dest_offset, args.count);
		}

		default:
			IVTVFB_DEBUG_INFO("Unknown ioctl %08x\n", cmd);
			return -EINVAL;
	}
	return 0;
}

/* Framebuffer device handling */

static int ivtvfb_set_var(struct ivtv *itv, struct fb_var_screeninfo *var)
{
	struct osd_info *oi = itv->osd_info;
	struct ivtv_osd_coords ivtv_osd;
	struct v4l2_rect ivtv_window;
	int osd_mode = -1;

	IVTVFB_DEBUG_INFO("ivtvfb_set_var\n");

	/* Select color space */
	if (var->nonstd) /* YUV */
		write_reg(read_reg(0x02a00) | 0x0002000, 0x02a00);
	else /* RGB  */
		write_reg(read_reg(0x02a00) & ~0x0002000, 0x02a00);

	/* Set the color mode */
	switch (var->bits_per_pixel) {
		case 8:
			osd_mode = IVTV_OSD_BPP_8;
			break;
		case 32:
			osd_mode = IVTV_OSD_BPP_32;
			break;
		case 16:
			switch (var->green.length) {
			case 4:
				osd_mode = IVTV_OSD_BPP_16_444;
				break;
			case 5:
				osd_mode = IVTV_OSD_BPP_16_555;
				break;
			case 6:
				osd_mode = IVTV_OSD_BPP_16_565;
				break;
			default:
				IVTVFB_DEBUG_WARN("ivtvfb_set_var - Invalid bpp\n");
			}
			break;
		default:
			IVTVFB_DEBUG_WARN("ivtvfb_set_var - Invalid bpp\n");
	}

	/* Set video mode. Although rare, the display can become scrambled even
	   if we don't change mode. Always 'bounce' to osd_mode via mode 0 */
	if (osd_mode != -1) {
		ivtv_vapi(itv, CX2341X_OSD_SET_PIXEL_FORMAT, 1, 0);
		ivtv_vapi(itv, CX2341X_OSD_SET_PIXEL_FORMAT, 1, osd_mode);
	}

	oi->bits_per_pixel = var->bits_per_pixel;
	oi->bytes_per_pixel = var->bits_per_pixel / 8;

	/* Set the flicker filter */
	switch (var->vmode & FB_VMODE_MASK) {
		case FB_VMODE_NONINTERLACED: /* Filter on */
			ivtv_vapi(itv, CX2341X_OSD_SET_FLICKER_STATE, 1, 1);
			break;
		case FB_VMODE_INTERLACED: /* Filter off */
			ivtv_vapi(itv, CX2341X_OSD_SET_FLICKER_STATE, 1, 0);
			break;
		default:
			IVTVFB_DEBUG_WARN("ivtvfb_set_var - Invalid video mode\n");
	}

	/* Read the current osd info */
	ivtvfb_get_osd_coords(itv, &ivtv_osd);

	/* Now set the OSD to the size we want */
	ivtv_osd.pixel_stride = var->xres_virtual;
	ivtv_osd.lines = var->yres_virtual;
	ivtv_osd.x = 0;
	ivtv_osd.y = 0;
	ivtvfb_set_osd_coords(itv, &ivtv_osd);

	/* Can't seem to find the right API combo for this.
	   Use another function which does what we need through direct register access. */
	ivtv_window.width = var->xres;
	ivtv_window.height = var->yres;

	/* Minimum margin cannot be 0, as X won't allow such a mode */
	if (!var->upper_margin)
		var->upper_margin++;
	if (!var->left_margin)
		var->left_margin++;
	ivtv_window.top = var->upper_margin - 1;
	ivtv_window.left = var->left_margin - 1;

	ivtvfb_set_display_window(itv, &ivtv_window);

	/* Pass screen size back to yuv handler */
	itv->yuv_info.osd_full_w = ivtv_osd.pixel_stride;
	itv->yuv_info.osd_full_h = ivtv_osd.lines;

	/* Force update of yuv registers */
	itv->yuv_info.yuv_forced_update = 1;

	/* Keep a copy of these settings */
	memcpy(&oi->fbvar_cur, var, sizeof(oi->fbvar_cur));

	IVTVFB_DEBUG_INFO("Display size: %dx%d (virtual %dx%d) @ %dbpp\n",
		      var->xres, var->yres,
		      var->xres_virtual, var->yres_virtual,
		      var->bits_per_pixel);

	IVTVFB_DEBUG_INFO("Display position: %d, %d\n",
		      var->left_margin, var->upper_margin);

	IVTVFB_DEBUG_INFO("Display filter: %s\n",
			(var->vmode & FB_VMODE_MASK) == FB_VMODE_NONINTERLACED ? "on" : "off");
	IVTVFB_DEBUG_INFO("Color space: %s\n", var->nonstd ? "YUV" : "RGB");

	return 0;
}

static int ivtvfb_get_fix(struct ivtv *itv, struct fb_fix_screeninfo *fix)
{
	struct osd_info *oi = itv->osd_info;

	IVTVFB_DEBUG_INFO("ivtvfb_get_fix\n");
	memset(fix, 0, sizeof(struct fb_fix_screeninfo));
	strlcpy(fix->id, "cx23415 TV out", sizeof(fix->id));
	fix->smem_start = oi->video_pbase;
	fix->smem_len = oi->video_buffer_size;
	fix->type = FB_TYPE_PACKED_PIXELS;
	fix->visual = (oi->bits_per_pixel == 8) ? FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
	fix->xpanstep = 1;
	fix->ypanstep = 1;
	fix->ywrapstep = 0;
	fix->line_length = oi->display_byte_stride;
	fix->accel = FB_ACCEL_NONE;
	return 0;
}

/* Check the requested display mode, returning -EINVAL if we can't
   handle it. */

static int _ivtvfb_check_var(struct fb_var_screeninfo *var, struct ivtv *itv)
{
	struct osd_info *oi = itv->osd_info;
	int osd_height_limit;
	u32 pixclock, hlimit, vlimit;

	IVTVFB_DEBUG_INFO("ivtvfb_check_var\n");

	/* Set base references for mode calcs. */
	if (itv->is_out_50hz) {
		pixclock = 84316;
		hlimit = 776;
		vlimit = 591;
		osd_height_limit = 576;
	}
	else {
		pixclock = 83926;
		hlimit = 776;
		vlimit = 495;
		osd_height_limit = 480;
	}

	if (var->bits_per_pixel == 8 || var->bits_per_pixel == 32) {
		var->transp.offset = 24;
		var->transp.length = 8;
		var->red.offset = 16;
		var->red.length = 8;
		var->green.offset = 8;
		var->green.length = 8;
		var->blue.offset = 0;
		var->blue.length = 8;
	}
	else if (var->bits_per_pixel == 16) {
		/* To find out the true mode, check green length */
		switch (var->green.length) {
			case 4:
				var->red.offset = 8;
				var->red.length = 4;
				var->green.offset = 4;
				var->green.length = 4;
				var->blue.offset = 0;
				var->blue.length = 4;
				var->transp.offset = 12;
				var->transp.length = 1;
				break;
			case 5:
				var->red.offset = 10;
				var->red.length = 5;
				var->green.offset = 5;
				var->green.length = 5;
				var->blue.offset = 0;
				var->blue.length = 5;
				var->transp.offset = 15;
				var->transp.length = 1;
				break;
			default:
				var->red.offset = 11;
				var->red.length = 5;
				var->green.offset = 5;
				var->green.length = 6;
				var->blue.offset = 0;
				var->blue.length = 5;
				var->transp.offset = 0;
				var->transp.length = 0;
				break;
		}
	}
	else {
		IVTVFB_DEBUG_WARN("Invalid colour mode: %d\n", var->bits_per_pixel);
		return -EINVAL;
	}

	/* Check the resolution */
	if (var->xres > IVTV_OSD_MAX_WIDTH || var->yres > osd_height_limit) {
		IVTVFB_DEBUG_WARN("Invalid resolution: %dx%d\n",
				var->xres, var->yres);
		return -EINVAL;
	}

	/* Max horizontal size is 1023 @ 32bpp, 2046 & 16bpp, 4092 @ 8bpp */
	if (var->xres_virtual > 4095 / (var->bits_per_pixel / 8) ||
	    var->xres_virtual * var->yres_virtual * (var->bits_per_pixel / 8) > oi->video_buffer_size ||
	    var->xres_virtual < var->xres ||
	    var->yres_virtual < var->yres) {
		IVTVFB_DEBUG_WARN("Invalid virtual resolution: %dx%d\n",
			var->xres_virtual, var->yres_virtual);
		return -EINVAL;
	}

	/* Some extra checks if in 8 bit mode */
	if (var->bits_per_pixel == 8) {
		/* Width must be a multiple of 4 */
		if (var->xres & 3) {
			IVTVFB_DEBUG_WARN("Invalid resolution for 8bpp: %d\n", var->xres);
			return -EINVAL;
		}
		if (var->xres_virtual & 3) {
			IVTVFB_DEBUG_WARN("Invalid virtual resolution for 8bpp: %d)\n", var->xres_virtual);
			return -EINVAL;
		}
	}
	else if (var->bits_per_pixel == 16) {
		/* Width must be a multiple of 2 */
		if (var->xres & 1) {
			IVTVFB_DEBUG_WARN("Invalid resolution for 16bpp: %d\n", var->xres);
			return -EINVAL;
		}
		if (var->xres_virtual & 1) {
			IVTVFB_DEBUG_WARN("Invalid virtual resolution for 16bpp: %d)\n", var->xres_virtual);
			return -EINVAL;
		}
	}

	/* Now check the offsets */
	if (var->xoffset >= var->xres_virtual || var->yoffset >= var->yres_virtual) {
		IVTVFB_DEBUG_WARN("Invalid offset: %d (%d) %d (%d)\n",
			var->xoffset, var->xres_virtual, var->yoffset, var->yres_virtual);
		return -EINVAL;
	}

	/* Check pixel format */
	if (var->nonstd > 1) {
		IVTVFB_DEBUG_WARN("Invalid nonstd % d\n", var->nonstd);
		return -EINVAL;
	}

	/* Check video mode */
	if (((var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED) &&
		((var->vmode & FB_VMODE_MASK) != FB_VMODE_INTERLACED)) {
		IVTVFB_DEBUG_WARN("Invalid video mode: %d\n", var->vmode & FB_VMODE_MASK);
		return -EINVAL;
	}

	/* Check the left & upper margins
	   If the margins are too large, just center the screen
	   (enforcing margins causes too many problems) */

	if (var->left_margin + var->xres > IVTV_OSD_MAX_WIDTH + 1)
		var->left_margin = 1 + ((IVTV_OSD_MAX_WIDTH - var->xres) / 2);

	if (var->upper_margin + var->yres > (itv->is_out_50hz ? 577 : 481))
		var->upper_margin = 1 + (((itv->is_out_50hz ? 576 : 480) -
			var->yres) / 2);

	/* Maintain overall 'size' for a constant refresh rate */
	var->right_margin = hlimit - var->left_margin - var->xres;
	var->lower_margin = vlimit - var->upper_margin - var->yres;

	/* Fixed sync times */
	var->hsync_len = 24;
	var->vsync_len = 2;

	/* Non-interlaced / interlaced mode is used to switch the OSD filter
	   on or off. Adjust the clock timings to maintain a constant
	   vertical refresh rate. */
	if ((var->vmode & FB_VMODE_MASK) == FB_VMODE_NONINTERLACED)
		var->pixclock = pixclock / 2;
	else
		var->pixclock = pixclock;

	itv->osd_rect.width = var->xres;
	itv->osd_rect.height = var->yres;

	IVTVFB_DEBUG_INFO("Display size: %dx%d (virtual %dx%d) @ %dbpp\n",
		      var->xres, var->yres,
		      var->xres_virtual, var->yres_virtual,
		      var->bits_per_pixel);

	IVTVFB_DEBUG_INFO("Display position: %d, %d\n",
		      var->left_margin, var->upper_margin);

	IVTVFB_DEBUG_INFO("Display filter: %s\n",
			(var->vmode & FB_VMODE_MASK) == FB_VMODE_NONINTERLACED ? "on" : "off");
	IVTVFB_DEBUG_INFO("Color space: %s\n", var->nonstd ? "YUV" : "RGB");
	return 0;
}

static int ivtvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
	struct ivtv *itv = (struct ivtv *) info->par;
	IVTVFB_DEBUG_INFO("ivtvfb_check_var\n");
	return _ivtvfb_check_var(var, itv);
}

static int ivtvfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
{
	u32 osd_pan_index;
	struct ivtv *itv = (struct ivtv *) info->par;

	if (var->yoffset + info->var.yres > info->var.yres_virtual ||
	    var->xoffset + info->var.xres > info->var.xres_virtual)
		return -EINVAL;

	osd_pan_index = var->yoffset * info->fix.line_length
		      + var->xoffset * info->var.bits_per_pixel / 8;
	write_reg(osd_pan_index, 0x02A0C);

	/* Pass this info back the yuv handler */
	itv->yuv_info.osd_x_pan = var->xoffset;
	itv->yuv_info.osd_y_pan = var->yoffset;
	/* Force update of yuv registers */
	itv->yuv_info.yuv_forced_update = 1;
	/* Remember this value */
	itv->osd_info->pan_cur = osd_pan_index;
	return 0;
}

static int ivtvfb_set_par(struct fb_info *info)
{
	int rc = 0;
	struct ivtv *itv = (struct ivtv *) info->par;

	IVTVFB_DEBUG_INFO("ivtvfb_set_par\n");

	rc = ivtvfb_set_var(itv, &info->var);
	ivtvfb_pan_display(&info->var, info);
	ivtvfb_get_fix(itv, &info->fix);
	ivtv_firmware_check(itv, "ivtvfb_set_par");
	return rc;
}

static int ivtvfb_setcolreg(unsigned regno, unsigned red, unsigned green,
				unsigned blue, unsigned transp,
				struct fb_info *info)
{
	u32 color, *palette;
	struct ivtv *itv = (struct ivtv *)info->par;

	if (regno >= info->cmap.len)
		return -EINVAL;

	color = ((transp & 0xFF00) << 16) |((red & 0xFF00) << 8) | (green & 0xFF00) | ((blue & 0xFF00) >> 8);
	if (info->var.bits_per_pixel <= 8) {
		write_reg(regno, 0x02a30);
		write_reg(color, 0x02a34);
		itv->osd_info->palette_cur[regno] = color;
		return 0;
	}
	if (regno >= 16)
		return -EINVAL;

	palette = info->pseudo_palette;
	if (info->var.bits_per_pixel == 16) {
		switch (info->var.green.length) {
			case 4:
				color = ((red & 0xf000) >> 4) |
					((green & 0xf000) >> 8) |
					((blue & 0xf000) >> 12);
				break;
			case 5:
				color = ((red & 0xf800) >> 1) |
					((green & 0xf800) >> 6) |
					((blue & 0xf800) >> 11);
				break;
			case 6:
				color = (red & 0xf800 ) |
					((green & 0xfc00) >> 5) |
					((blue & 0xf800) >> 11);
				break;
		}
	}
	palette[regno] = color;
	return 0;
}

/* We don't really support blanking. All this does is enable or
   disable the OSD. */
static int ivtvfb_blank(int blank_mode, struct fb_info *info)
{
	struct ivtv *itv = (struct ivtv *)info->par;

	IVTVFB_DEBUG_INFO("Set blanking mode : %d\n", blank_mode);
	switch (blank_mode) {
	case FB_BLANK_UNBLANK:
		ivtv_vapi(itv, CX2341X_OSD_SET_STATE, 1, 1);
		ivtv_call_hw(itv, IVTV_HW_SAA7127, video, s_stream, 1);
		break;
	case FB_BLANK_NORMAL:
	case FB_BLANK_HSYNC_SUSPEND:
	case FB_BLANK_VSYNC_SUSPEND:
		ivtv_vapi(itv, CX2341X_OSD_SET_STATE, 1, 0);
		ivtv_call_hw(itv, IVTV_HW_SAA7127, video, s_stream, 1);
		break;
	case FB_BLANK_POWERDOWN:
		ivtv_call_hw(itv, IVTV_HW_SAA7127, video, s_stream, 0);
		ivtv_vapi(itv, CX2341X_OSD_SET_STATE, 1, 0);
		break;
	}
	itv->osd_info->blank_cur = blank_mode;
	return 0;
}

static struct fb_ops ivtvfb_ops = {
	.owner = THIS_MODULE,
	.fb_write       = ivtvfb_write,
	.fb_check_var   = ivtvfb_check_var,
	.fb_set_par     = ivtvfb_set_par,
	.fb_setcolreg   = ivtvfb_setcolreg,
	.fb_fillrect    = cfb_fillrect,
	.fb_copyarea    = cfb_copyarea,
	.fb_imageblit   = cfb_imageblit,
	.fb_cursor      = NULL,
	.fb_ioctl       = ivtvfb_ioctl,
	.fb_pan_display = ivtvfb_pan_display,
	.fb_blank       = ivtvfb_blank,
};

/* Restore hardware after firmware restart */
static void ivtvfb_restore(struct ivtv *itv)
{
	struct osd_info *oi = itv->osd_info;
	int i;

	ivtvfb_set_var(itv, &oi->fbvar_cur);
	ivtvfb_blank(oi->blank_cur, &oi->ivtvfb_info);
	for (i = 0; i < 256; i++) {
		write_reg(i, 0x02a30);
		write_reg(oi->palette_cur[i], 0x02a34);
	}
	write_reg(oi->pan_cur, 0x02a0c);
}

/* Initialization */


/* Setup our initial video mode */
static int ivtvfb_init_vidmode(struct ivtv *itv)
{
	struct osd_info *oi = itv->osd_info;
	struct v4l2_rect start_window;
	int max_height;

	/* Color mode */

	if (osd_depth != 8 && osd_depth != 16 && osd_depth != 32)
		osd_depth = 8;
	oi->bits_per_pixel = osd_depth;
	oi->bytes_per_pixel = oi->bits_per_pixel / 8;

	/* Horizontal size & position */

	if (osd_xres > 720)
		osd_xres = 720;

	/* Must be a multiple of 4 for 8bpp & 2 for 16bpp */
	if (osd_depth == 8)
		osd_xres &= ~3;
	else if (osd_depth == 16)
		osd_xres &= ~1;

	start_window.width = osd_xres ? osd_xres : 640;

	/* Check horizontal start (osd_left). */
	if (osd_left && osd_left + start_window.width > 721) {
		IVTVFB_ERR("Invalid osd_left - assuming default\n");
		osd_left = 0;
	}

	/* Hardware coords start at 0, user coords start at 1. */
	osd_left--;

	start_window.left = osd_left >= 0 ?
		 osd_left : ((IVTV_OSD_MAX_WIDTH - start_window.width) / 2);

	oi->display_byte_stride =
			start_window.width * oi->bytes_per_pixel;

	/* Vertical size & position */

	max_height = itv->is_out_50hz ? 576 : 480;

	if (osd_yres > max_height)
		osd_yres = max_height;

	start_window.height = osd_yres ?
		osd_yres : itv->is_out_50hz ? 480 : 400;

	/* Check vertical start (osd_upper). */
	if (osd_upper + start_window.height > max_height + 1) {
		IVTVFB_ERR("Invalid osd_upper - assuming default\n");
		osd_upper = 0;
	}

	/* Hardware coords start at 0, user coords start at 1. */
	osd_upper--;

	start_window.top = osd_upper >= 0 ? osd_upper : ((max_height - start_window.height) / 2);

	oi->display_width = start_window.width;
	oi->display_height = start_window.height;

	/* Generate a valid fb_var_screeninfo */

	oi->ivtvfb_defined.xres = oi->display_width;
	oi->ivtvfb_defined.yres = oi->display_height;
	oi->ivtvfb_defined.xres_virtual = oi->display_width;
	oi->ivtvfb_defined.yres_virtual = oi->display_height;
	oi->ivtvfb_defined.bits_per_pixel = oi->bits_per_pixel;
	oi->ivtvfb_defined.vmode = (osd_laced ? FB_VMODE_INTERLACED : FB_VMODE_NONINTERLACED);
	oi->ivtvfb_defined.left_margin = start_window.left + 1;
	oi->ivtvfb_defined.upper_margin = start_window.top + 1;
	oi->ivtvfb_defined.accel_flags = FB_ACCEL_NONE;
	oi->ivtvfb_defined.nonstd = 0;

	/* We've filled in the most data, let the usual mode check
	   routine fill in the rest. */
	_ivtvfb_check_var(&oi->ivtvfb_defined, itv);

	/* Generate valid fb_fix_screeninfo */

	ivtvfb_get_fix(itv, &oi->ivtvfb_fix);

	/* Generate valid fb_info */

	oi->ivtvfb_info.node = -1;
	oi->ivtvfb_info.flags = FBINFO_FLAG_DEFAULT;
	oi->ivtvfb_info.fbops = &ivtvfb_ops;
	oi->ivtvfb_info.par = itv;
	oi->ivtvfb_info.var = oi->ivtvfb_defined;
	oi->ivtvfb_info.fix = oi->ivtvfb_fix;
	oi->ivtvfb_info.screen_base = (u8 __iomem *)oi->video_vbase;
	oi->ivtvfb_info.fbops = &ivtvfb_ops;

	/* Supply some monitor specs. Bogus values will do for now */
	oi->ivtvfb_info.monspecs.hfmin = 8000;
	oi->ivtvfb_info.monspecs.hfmax = 70000;
	oi->ivtvfb_info.monspecs.vfmin = 10;
	oi->ivtvfb_info.monspecs.vfmax = 100;

	/* Allocate color map */
	if (fb_alloc_cmap(&oi->ivtvfb_info.cmap, 256, 1)) {
		IVTVFB_ERR("abort, unable to alloc cmap\n");
		return -ENOMEM;
	}

	/* Allocate the pseudo palette */
	oi->ivtvfb_info.pseudo_palette =
		kmalloc(sizeof(u32) * 16, GFP_KERNEL|__GFP_NOWARN);

	if (!oi->ivtvfb_info.pseudo_palette) {
		IVTVFB_ERR("abort, unable to alloc pseudo palette\n");
		return -ENOMEM;
	}

	return 0;
}

/* Find OSD buffer base & size. Add to mtrr. Zero osd buffer. */

static int ivtvfb_init_io(struct ivtv *itv)
{
	struct osd_info *oi = itv->osd_info;

	mutex_lock(&itv->serialize_lock);
	if (ivtv_init_on_first_open(itv)) {
		mutex_unlock(&itv->serialize_lock);
		IVTVFB_ERR("Failed to initialize ivtv\n");
		return -ENXIO;
	}
	mutex_unlock(&itv->serialize_lock);

	if (ivtvfb_get_framebuffer(itv, &oi->video_rbase,
					&oi->video_buffer_size) < 0) {
		IVTVFB_ERR("Firmware failed to respond\n");
		return -EIO;
	}

	/* The osd buffer size depends on the number of video buffers allocated
	   on the PVR350 itself. For now we'll hardcode the smallest osd buffer
	   size to prevent any overlap. */
	oi->video_buffer_size = 1704960;

	oi->video_pbase = itv->base_addr + IVTV_DECODER_OFFSET + oi->video_rbase;
	oi->video_vbase = itv->dec_mem + oi->video_rbase;

	if (!oi->video_vbase) {
		IVTVFB_ERR("abort, video memory 0x%x @ 0x%lx isn't mapped!\n",
		     oi->video_buffer_size, oi->video_pbase);
		return -EIO;
	}

	IVTVFB_INFO("Framebuffer at 0x%lx, mapped to 0x%p, size %dk\n",
			oi->video_pbase, oi->video_vbase,
			oi->video_buffer_size / 1024);

#ifdef CONFIG_MTRR
	{
		/* Find the largest power of two that maps the whole buffer */
		int size_shift = 31;

		while (!(oi->video_buffer_size & (1 << size_shift))) {
			size_shift--;
		}
		size_shift++;
		oi->fb_start_aligned_physaddr = oi->video_pbase & ~((1 << size_shift) - 1);
		oi->fb_end_aligned_physaddr = oi->video_pbase + oi->video_buffer_size;
		oi->fb_end_aligned_physaddr += (1 << size_shift) - 1;
		oi->fb_end_aligned_physaddr &= ~((1 << size_shift) - 1);
		if (mtrr_add(oi->fb_start_aligned_physaddr,
			oi->fb_end_aligned_physaddr - oi->fb_start_aligned_physaddr,
			     MTRR_TYPE_WRCOMB, 1) < 0) {
			IVTVFB_INFO("disabled mttr\n");
			oi->fb_start_aligned_physaddr = 0;
			oi->fb_end_aligned_physaddr = 0;
		}
	}
#endif

	/* Blank the entire osd. */
	memset_io(oi->video_vbase, 0, oi->video_buffer_size);

	return 0;
}

/* Release any memory we've grabbed & remove mtrr entry */
static void ivtvfb_release_buffers (struct ivtv *itv)
{
	struct osd_info *oi = itv->osd_info;

	/* Release cmap */
	if (oi->ivtvfb_info.cmap.len)
		fb_dealloc_cmap(&oi->ivtvfb_info.cmap);

	/* Release pseudo palette */
	kfree(oi->ivtvfb_info.pseudo_palette);

#ifdef CONFIG_MTRR
	if (oi->fb_end_aligned_physaddr) {
		mtrr_del(-1, oi->fb_start_aligned_physaddr,
			oi->fb_end_aligned_physaddr - oi->fb_start_aligned_physaddr);
	}
#endif

	kfree(oi);
	itv->osd_info = NULL;
}

/* Initialize the specified card */

static int ivtvfb_init_card(struct ivtv *itv)
{
	int rc;

	if (itv->osd_info) {
		IVTVFB_ERR("Card %d already initialised\n", ivtvfb_card_id);
		return -EBUSY;
	}

	itv->osd_info = kzalloc(sizeof(struct osd_info),
					GFP_ATOMIC|__GFP_NOWARN);
	if (itv->osd_info == NULL) {
		IVTVFB_ERR("Failed to allocate memory for osd_info\n");
		return -ENOMEM;
	}

	/* Find & setup the OSD buffer */
	rc = ivtvfb_init_io(itv);
	if (rc) {
		ivtvfb_release_buffers(itv);
		return rc;
	}

	/* Set the startup video mode information */
	if ((rc = ivtvfb_init_vidmode(itv))) {
		ivtvfb_release_buffers(itv);
		return rc;
	}

	/* Register the framebuffer */
	if (register_framebuffer(&itv->osd_info->ivtvfb_info) < 0) {
		ivtvfb_release_buffers(itv);
		return -EINVAL;
	}

	itv->osd_video_pbase = itv->osd_info->video_pbase;

	/* Set the card to the requested mode */
	ivtvfb_set_par(&itv->osd_info->ivtvfb_info);

	/* Set color 0 to black */
	write_reg(0, 0x02a30);
	write_reg(0, 0x02a34);

	/* Enable the osd */
	ivtvfb_blank(FB_BLANK_UNBLANK, &itv->osd_info->ivtvfb_info);

	/* Enable restart */
	itv->ivtvfb_restore = ivtvfb_restore;

	/* Allocate DMA */
	ivtv_udma_alloc(itv);
	return 0;

}

static int __init ivtvfb_callback_init(struct device *dev, void *p)
{
	struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
	struct ivtv *itv = container_of(v4l2_dev, struct ivtv, v4l2_dev);

	if (itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT) {
		if (ivtvfb_init_card(itv) == 0) {
			IVTVFB_INFO("Framebuffer registered on %s\n",
					itv->v4l2_dev.name);
			(*(int *)p)++;
		}
	}
	return 0;
}

static int ivtvfb_callback_cleanup(struct device *dev, void *p)
{
	struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
	struct ivtv *itv = container_of(v4l2_dev, struct ivtv, v4l2_dev);
	struct osd_info *oi = itv->osd_info;

	if (itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT) {
		if (unregister_framebuffer(&itv->osd_info->ivtvfb_info)) {
			IVTVFB_WARN("Framebuffer %d is in use, cannot unload\n",
				       itv->instance);
			return 0;
		}
		IVTVFB_INFO("Unregister framebuffer %d\n", itv->instance);
		itv->ivtvfb_restore = NULL;
		ivtvfb_blank(FB_BLANK_VSYNC_SUSPEND, &oi->ivtvfb_info);
		ivtvfb_release_buffers(itv);
		itv->osd_video_pbase = 0;
	}
	return 0;
}

static int __init ivtvfb_init(void)
{
	struct device_driver *drv;
	int registered = 0;
	int err;

	if (ivtvfb_card_id < -1 || ivtvfb_card_id >= IVTV_MAX_CARDS) {
		printk(KERN_ERR "ivtvfb:  ivtvfb_card_id parameter is out of range (valid range: -1 - %d)\n",
		     IVTV_MAX_CARDS - 1);
		return -EINVAL;
	}

	drv = driver_find("ivtv", &pci_bus_type);
	err = driver_for_each_device(drv, NULL, &registered, ivtvfb_callback_init);
	(void)err;	/* suppress compiler warning */
	if (!registered) {
		printk(KERN_ERR "ivtvfb:  no cards found\n");
		return -ENODEV;
	}
	return 0;
}

static void ivtvfb_cleanup(void)
{
	struct device_driver *drv;
	int err;

	printk(KERN_INFO "ivtvfb:  Unloading framebuffer module\n");

	drv = driver_find("ivtv", &pci_bus_type);
	err = driver_for_each_device(drv, NULL, NULL, ivtvfb_callback_cleanup);
	(void)err;	/* suppress compiler warning */
}

module_init(ivtvfb_init);
module_exit(ivtvfb_cleanup);