drivers/media/video/vpx3220.c

   1 /*
   2  * vpx3220a, vpx3216b & vpx3214c video decoder driver version 0.0.1
   3  *
   4  * Copyright (C) 2001 Laurent Pinchart <lpinchart@freegates.be>
   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., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/delay.h>
  24 #include <linux/types.h>
  25 #include <linux/slab.h>
  26 #include <asm/uaccess.h>
  27 #include <linux/i2c.h>
  28 #include <linux/videodev2.h>
  29 #include <media/v4l2-device.h>
  30 #include <media/v4l2-chip-ident.h>
  31
  32 MODULE_DESCRIPTION("vpx3220a/vpx3216b/vpx3214c video decoder driver");
  33 MODULE_AUTHOR("Laurent Pinchart");
  34 MODULE_LICENSE("GPL");
  35
  36 static int debug;
  37 module_param(debug, int, 0);
  38 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  39
  40
  41 #define VPX_TIMEOUT_COUNT  10
  42
  43 /* ----------------------------------------------------------------------- */
  44
  45 struct vpx3220 {
  46         struct v4l2_subdev sd;
  47         unsigned char reg[255];
  48
  49         v4l2_std_id norm;
  50         int ident;
  51         int input;
  52         int enable;
  53         int bright;
  54         int contrast;
  55         int hue;
  56         int sat;
  57 };
  58
  59 static inline struct vpx3220 *to_vpx3220(struct v4l2_subdev *sd)
  60 {
  61         return container_of(sd, struct vpx3220, sd);
  62 }
  63
  64 static char *inputs[] = { "internal", "composite", "svideo" };
  65
  66 /* ----------------------------------------------------------------------- */
  67
  68 static inline int vpx3220_write(struct v4l2_subdev *sd, u8 reg, u8 value)
  69 {
  70         struct i2c_client *client = v4l2_get_subdevdata(sd);
  71         struct vpx3220 *decoder = i2c_get_clientdata(client);
  72
  73         decoder->reg[reg] = value;
  74         return i2c_smbus_write_byte_data(client, reg, value);
  75 }
  76
  77 static inline int vpx3220_read(struct v4l2_subdev *sd, u8 reg)
  78 {
  79         struct i2c_client *client = v4l2_get_subdevdata(sd);
  80
  81         return i2c_smbus_read_byte_data(client, reg);
  82 }
  83
  84 static int vpx3220_fp_status(struct v4l2_subdev *sd)
  85 {
  86         unsigned char status;
  87         unsigned int i;
  88
  89         for (i = 0; i < VPX_TIMEOUT_COUNT; i++) {
  90                 status = vpx3220_read(sd, 0x29);
  91
  92                 if (!(status & 4))
  93                         return 0;
  94
  95                 udelay(10);
  96
  97                 if (need_resched())
  98                         cond_resched();
  99         }
 100
 101         return -1;
 102 }
 103
 104 static int vpx3220_fp_write(struct v4l2_subdev *sd, u8 fpaddr, u16 data)
 105 {
 106         struct i2c_client *client = v4l2_get_subdevdata(sd);
 107
 108         /* Write the 16-bit address to the FPWR register */
 109         if (i2c_smbus_write_word_data(client, 0x27, swab16(fpaddr)) == -1) {
 110                 v4l2_dbg(1, debug, sd, "%s: failed\n", __func__);
 111                 return -1;
 112         }
 113
 114         if (vpx3220_fp_status(sd) < 0)
 115                 return -1;
 116
 117         /* Write the 16-bit data to the FPDAT register */
 118         if (i2c_smbus_write_word_data(client, 0x28, swab16(data)) == -1) {
 119                 v4l2_dbg(1, debug, sd, "%s: failed\n", __func__);
 120                 return -1;
 121         }
 122
 123         return 0;
 124 }
 125
 126 static u16 vpx3220_fp_read(struct v4l2_subdev *sd, u16 fpaddr)
 127 {
 128         struct i2c_client *client = v4l2_get_subdevdata(sd);
 129         s16 data;
 130
 131         /* Write the 16-bit address to the FPRD register */
 132         if (i2c_smbus_write_word_data(client, 0x26, swab16(fpaddr)) == -1) {
 133                 v4l2_dbg(1, debug, sd, "%s: failed\n", __func__);
 134                 return -1;
 135         }
 136
 137         if (vpx3220_fp_status(sd) < 0)
 138                 return -1;
 139
 140         /* Read the 16-bit data from the FPDAT register */
 141         data = i2c_smbus_read_word_data(client, 0x28);
 142         if (data == -1) {
 143                 v4l2_dbg(1, debug, sd, "%s: failed\n", __func__);
 144                 return -1;
 145         }
 146
 147         return swab16(data);
 148 }
 149
 150 static int vpx3220_write_block(struct v4l2_subdev *sd, const u8 *data, unsigned int len)
 151 {
 152         u8 reg;
 153         int ret = -1;
 154
 155         while (len >= 2) {
 156                 reg = *data++;
 157                 ret = vpx3220_write(sd, reg, *data++);
 158                 if (ret < 0)
 159                         break;
 160                 len -= 2;
 161         }
 162
 163         return ret;
 164 }
 165
 166 static int vpx3220_write_fp_block(struct v4l2_subdev *sd,
 167                 const u16 *data, unsigned int len)
 168 {
 169         u8 reg;
 170         int ret = 0;
 171
 172         while (len > 1) {
 173                 reg = *data++;
 174                 ret |= vpx3220_fp_write(sd, reg, *data++);
 175                 len -= 2;
 176         }
 177
 178         return ret;
 179 }
 180
 181 /* ---------------------------------------------------------------------- */
 182
 183 static const unsigned short init_ntsc[] = {
 184         0x1c, 0x00,             /* NTSC tint angle */
 185         0x88, 17,               /* Window 1 vertical */
 186         0x89, 240,              /* Vertical lines in */
 187         0x8a, 240,              /* Vertical lines out */
 188         0x8b, 000,              /* Horizontal begin */
 189         0x8c, 640,              /* Horizontal length */
 190         0x8d, 640,              /* Number of pixels */
 191         0x8f, 0xc00,            /* Disable window 2 */
 192         0xf0, 0x73,             /* 13.5 MHz transport, Forced
 193                                  * mode, latch windows */
 194         0xf2, 0x13,             /* NTSC M, composite input */
 195         0xe7, 0x1e1,            /* Enable vertical standard
 196                                  * locking @ 240 lines */
 197 };
 198
 199 static const unsigned short init_pal[] = {
 200         0x88, 23,               /* Window 1 vertical begin */
 201         0x89, 288,              /* Vertical lines in (16 lines
 202                                  * skipped by the VFE) */
 203         0x8a, 288,              /* Vertical lines out (16 lines
 204                                  * skipped by the VFE) */
 205         0x8b, 16,               /* Horizontal begin */
 206         0x8c, 768,              /* Horizontal length */
 207         0x8d, 784,              /* Number of pixels
 208                                  * Must be >= Horizontal begin + Horizontal length */
 209         0x8f, 0xc00,            /* Disable window 2 */
 210         0xf0, 0x77,             /* 13.5 MHz transport, Forced
 211                                  * mode, latch windows */
 212         0xf2, 0x3d1,            /* PAL B,G,H,I, composite input */
 213         0xe7, 0x241,            /* PAL/SECAM set to 288 lines */
 214 };
 215
 216 static const unsigned short init_secam[] = {
 217         0x88, 23,               /* Window 1 vertical begin */
 218         0x89, 288,              /* Vertical lines in (16 lines
 219                                  * skipped by the VFE) */
 220         0x8a, 288,              /* Vertical lines out (16 lines
 221                                  * skipped by the VFE) */
 222         0x8b, 16,               /* Horizontal begin */
 223         0x8c, 768,              /* Horizontal length */
 224         0x8d, 784,              /* Number of pixels
 225                                  * Must be >= Horizontal begin + Horizontal length */
 226         0x8f, 0xc00,            /* Disable window 2 */
 227         0xf0, 0x77,             /* 13.5 MHz transport, Forced
 228                                  * mode, latch windows */
 229         0xf2, 0x3d5,            /* SECAM, composite input */
 230         0xe7, 0x241,            /* PAL/SECAM set to 288 lines */
 231 };
 232
 233 static const unsigned char init_common[] = {
 234         0xf2, 0x00,             /* Disable all outputs */
 235         0x33, 0x0d,             /* Luma : VIN2, Chroma : CIN
 236                                  * (clamp off) */
 237         0xd8, 0xa8,             /* HREF/VREF active high, VREF
 238                                  * pulse = 2, Odd/Even flag */
 239         0x20, 0x03,             /* IF compensation 0dB/oct */
 240         0xe0, 0xff,             /* Open up all comparators */
 241         0xe1, 0x00,
 242         0xe2, 0x7f,
 243         0xe3, 0x80,
 244         0xe4, 0x7f,
 245         0xe5, 0x80,
 246         0xe6, 0x00,             /* Brightness set to 0 */
 247         0xe7, 0xe0,             /* Contrast to 1.0, noise shaping
 248                                  * 10 to 8 2-bit error diffusion */
 249         0xe8, 0xf8,             /* YUV422, CbCr binary offset,
 250                                  * ... (p.32) */
 251         0xea, 0x18,             /* LLC2 connected, output FIFO
 252                                  * reset with VACTintern */
 253         0xf0, 0x8a,             /* Half full level to 10, bus
 254                                  * shuffler [7:0, 23:16, 15:8] */
 255         0xf1, 0x18,             /* Single clock, sync mode, no
 256                                  * FE delay, no HLEN counter */
 257         0xf8, 0x12,             /* Port A, PIXCLK, HF# & FE#
 258                                  * strength to 2 */
 259         0xf9, 0x24,             /* Port B, HREF, VREF, PREF &
 260                                  * ALPHA strength to 4 */
 261 };
 262
 263 static const unsigned short init_fp[] = {
 264         0x59, 0,
 265         0xa0, 2070,             /* ACC reference */
 266         0xa3, 0,
 267         0xa4, 0,
 268         0xa8, 30,
 269         0xb2, 768,
 270         0xbe, 27,
 271         0x58, 0,
 272         0x26, 0,
 273         0x4b, 0x298,            /* PLL gain */
 274 };
 275
 276
 277 static int vpx3220_init(struct v4l2_subdev *sd, u32 val)
 278 {
 279         struct vpx3220 *decoder = to_vpx3220(sd);
 280
 281         vpx3220_write_block(sd, init_common, sizeof(init_common));
 282         vpx3220_write_fp_block(sd, init_fp, sizeof(init_fp) >> 1);
 283         if (decoder->norm & V4L2_STD_NTSC)
 284                 vpx3220_write_fp_block(sd, init_ntsc, sizeof(init_ntsc) >> 1);
 285         else if (decoder->norm & V4L2_STD_PAL)
 286                 vpx3220_write_fp_block(sd, init_pal, sizeof(init_pal) >> 1);
 287         else if (decoder->norm & V4L2_STD_SECAM)
 288                 vpx3220_write_fp_block(sd, init_secam, sizeof(init_secam) >> 1);
 289         else
 290                 vpx3220_write_fp_block(sd, init_pal, sizeof(init_pal) >> 1);
 291         return 0;
 292 }
 293
 294 static int vpx3220_status(struct v4l2_subdev *sd, u32 *pstatus, v4l2_std_id *pstd)
 295 {
 296         int res = V4L2_IN_ST_NO_SIGNAL, status;
 297         v4l2_std_id std = 0;
 298
 299         status = vpx3220_fp_read(sd, 0x0f3);
 300
 301         v4l2_dbg(1, debug, sd, "status: 0x%04x\n", status);
 302
 303         if (status < 0)
 304                 return status;
 305
 306         if ((status & 0x20) == 0) {
 307                 res = 0;
 308
 309                 switch (status & 0x18) {
 310                 case 0x00:
 311                 case 0x10:
 312                 case 0x14:
 313                 case 0x18:
 314                         std = V4L2_STD_PAL;
 315                         break;
 316
 317                 case 0x08:
 318                         std = V4L2_STD_SECAM;
 319                         break;
 320
 321                 case 0x04:
 322                 case 0x0c:
 323                 case 0x1c:
 324                         std = V4L2_STD_NTSC;
 325                         break;
 326                 }
 327         }
 328         if (pstd)
 329                 *pstd = std;
 330         if (pstatus)
 331                 *pstatus = status;
 332         return 0;
 333 }
 334
 335 static int vpx3220_querystd(struct v4l2_subdev *sd, v4l2_std_id *std)
 336 {
 337         v4l2_dbg(1, debug, sd, "querystd\n");
 338         return vpx3220_status(sd, NULL, std);
 339 }
 340
 341 static int vpx3220_g_input_status(struct v4l2_subdev *sd, u32 *status)
 342 {
 343         v4l2_dbg(1, debug, sd, "g_input_status\n");
 344         return vpx3220_status(sd, status, NULL);
 345 }
 346
 347 static int vpx3220_s_std(struct v4l2_subdev *sd, v4l2_std_id std)
 348 {
 349         struct vpx3220 *decoder = to_vpx3220(sd);
 350         int temp_input;
 351
 352         /* Here we back up the input selection because it gets
 353            overwritten when we fill the registers with the
 354            choosen video norm */
 355         temp_input = vpx3220_fp_read(sd, 0xf2);
 356
 357         v4l2_dbg(1, debug, sd, "s_std %llx\n", (unsigned long long)std);
 358         if (std & V4L2_STD_NTSC) {
 359                 vpx3220_write_fp_block(sd, init_ntsc, sizeof(init_ntsc) >> 1);
 360                 v4l2_dbg(1, debug, sd, "norm switched to NTSC\n");
 361         } else if (std & V4L2_STD_PAL) {
 362                 vpx3220_write_fp_block(sd, init_pal, sizeof(init_pal) >> 1);
 363                 v4l2_dbg(1, debug, sd, "norm switched to PAL\n");
 364         } else if (std & V4L2_STD_SECAM) {
 365                 vpx3220_write_fp_block(sd, init_secam, sizeof(init_secam) >> 1);
 366                 v4l2_dbg(1, debug, sd, "norm switched to SECAM\n");
 367         } else {
 368                 return -EINVAL;
 369         }
 370
 371         decoder->norm = std;
 372
 373         /* And here we set the backed up video input again */
 374         vpx3220_fp_write(sd, 0xf2, temp_input | 0x0010);
 375         udelay(10);
 376         return 0;
 377 }
 378
 379 static int vpx3220_s_routing(struct v4l2_subdev *sd,
 380                              u32 input, u32 output, u32 config)
 381 {
 382         int data;
 383
 384         /* RJ:   input = 0: ST8 (PCTV) input
 385                  input = 1: COMPOSITE  input
 386                  input = 2: SVHS       input  */
 387
 388         const int input_vals[3][2] = {
 389                 {0x0c, 0},
 390                 {0x0d, 0},
 391                 {0x0e, 1}
 392         };
 393
 394         if (input > 2)
 395                 return -EINVAL;
 396
 397         v4l2_dbg(1, debug, sd, "input switched to %s\n", inputs[input]);
 398
 399         vpx3220_write(sd, 0x33, input_vals[input][0]);
 400
 401         data = vpx3220_fp_read(sd, 0xf2) & ~(0x0020);
 402         if (data < 0)
 403                 return data;
 404         /* 0x0010 is required to latch the setting */
 405         vpx3220_fp_write(sd, 0xf2,
 406                         data | (input_vals[input][1] << 5) | 0x0010);
 407
 408         udelay(10);
 409         return 0;
 410 }
 411
 412 static int vpx3220_s_stream(struct v4l2_subdev *sd, int enable)
 413 {
 414         v4l2_dbg(1, debug, sd, "s_stream %s\n", enable ? "on" : "off");
 415
 416         vpx3220_write(sd, 0xf2, (enable ? 0x1b : 0x00));
 417         return 0;
 418 }
 419
 420 static int vpx3220_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
 421 {
 422         switch (qc->id) {
 423         case V4L2_CID_BRIGHTNESS:
 424                 v4l2_ctrl_query_fill(qc, -128, 127, 1, 0);
 425                 break;
 426
 427         case V4L2_CID_CONTRAST:
 428                 v4l2_ctrl_query_fill(qc, 0, 63, 1, 32);
 429                 break;
 430
 431         case V4L2_CID_SATURATION:
 432                 v4l2_ctrl_query_fill(qc, 0, 4095, 1, 2048);
 433                 break;
 434
 435         case V4L2_CID_HUE:
 436                 v4l2_ctrl_query_fill(qc, -512, 511, 1, 0);
 437                 break;
 438
 439         default:
 440                 return -EINVAL;
 441         }
 442         return 0;
 443 }
 444
 445 static int vpx3220_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 446 {
 447         struct vpx3220 *decoder = to_vpx3220(sd);
 448
 449         switch (ctrl->id) {
 450         case V4L2_CID_BRIGHTNESS:
 451                 ctrl->value = decoder->bright;
 452                 break;
 453         case V4L2_CID_CONTRAST:
 454                 ctrl->value = decoder->contrast;
 455                 break;
 456         case V4L2_CID_SATURATION:
 457                 ctrl->value = decoder->sat;
 458                 break;
 459         case V4L2_CID_HUE:
 460                 ctrl->value = decoder->hue;
 461                 break;
 462         default:
 463                 return -EINVAL;
 464         }
 465         return 0;
 466 }
 467
 468 static int vpx3220_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 469 {
 470         struct vpx3220 *decoder = to_vpx3220(sd);
 471
 472         switch (ctrl->id) {
 473         case V4L2_CID_BRIGHTNESS:
 474                 if (decoder->bright != ctrl->value) {
 475                         decoder->bright = ctrl->value;
 476                         vpx3220_write(sd, 0xe6, decoder->bright);
 477                 }
 478                 break;
 479         case V4L2_CID_CONTRAST:
 480                 if (decoder->contrast != ctrl->value) {
 481                         /* Bit 7 and 8 is for noise shaping */
 482                         decoder->contrast = ctrl->value;
 483                         vpx3220_write(sd, 0xe7, decoder->contrast + 192);
 484                 }
 485                 break;
 486         case V4L2_CID_SATURATION:
 487                 if (decoder->sat != ctrl->value) {
 488                         decoder->sat = ctrl->value;
 489                         vpx3220_fp_write(sd, 0xa0, decoder->sat);
 490                 }
 491                 break;
 492         case V4L2_CID_HUE:
 493                 if (decoder->hue != ctrl->value) {
 494                         decoder->hue = ctrl->value;
 495                         vpx3220_fp_write(sd, 0x1c, decoder->hue);
 496                 }
 497                 break;
 498         default:
 499                 return -EINVAL;
 500         }
 501         return 0;
 502 }
 503
 504 static int vpx3220_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 505 {
 506         struct vpx3220 *decoder = to_vpx3220(sd);
 507         struct i2c_client *client = v4l2_get_subdevdata(sd);
 508
 509         return v4l2_chip_ident_i2c_client(client, chip, decoder->ident, 0);
 510 }
 511
 512 /* ----------------------------------------------------------------------- */
 513
 514 static const struct v4l2_subdev_core_ops vpx3220_core_ops = {
 515         .g_chip_ident = vpx3220_g_chip_ident,
 516         .init = vpx3220_init,
 517         .g_ctrl = vpx3220_g_ctrl,
 518         .s_ctrl = vpx3220_s_ctrl,
 519         .queryctrl = vpx3220_queryctrl,
 520         .s_std = vpx3220_s_std,
 521 };
 522
 523 static const struct v4l2_subdev_video_ops vpx3220_video_ops = {
 524         .s_routing = vpx3220_s_routing,
 525         .s_stream = vpx3220_s_stream,
 526         .querystd = vpx3220_querystd,
 527         .g_input_status = vpx3220_g_input_status,
 528 };
 529
 530 static const struct v4l2_subdev_ops vpx3220_ops = {
 531         .core = &vpx3220_core_ops,
 532         .video = &vpx3220_video_ops,
 533 };
 534
 535 /* -----------------------------------------------------------------------
 536  * Client management code
 537  */
 538
 539 static int vpx3220_probe(struct i2c_client *client,
 540                         const struct i2c_device_id *id)
 541 {
 542         struct vpx3220 *decoder;
 543         struct v4l2_subdev *sd;
 544         const char *name = NULL;
 545         u8 ver;
 546         u16 pn;
 547
 548         /* Check if the adapter supports the needed features */
 549         if (!i2c_check_functionality(client->adapter,
 550                 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
 551                 return -ENODEV;
 552
 553         decoder = kzalloc(sizeof(struct vpx3220), GFP_KERNEL);
 554         if (decoder == NULL)
 555                 return -ENOMEM;
 556         sd = &decoder->sd;
 557         v4l2_i2c_subdev_init(sd, client, &vpx3220_ops);
 558         decoder->norm = V4L2_STD_PAL;
 559         decoder->input = 0;
 560         decoder->enable = 1;
 561         decoder->bright = 32768;
 562         decoder->contrast = 32768;
 563         decoder->hue = 32768;
 564         decoder->sat = 32768;
 565
 566         ver = i2c_smbus_read_byte_data(client, 0x00);
 567         pn = (i2c_smbus_read_byte_data(client, 0x02) << 8) +
 568                 i2c_smbus_read_byte_data(client, 0x01);
 569         decoder->ident = V4L2_IDENT_VPX3220A;
 570         if (ver == 0xec) {
 571                 switch (pn) {
 572                 case 0x4680:
 573                         name = "vpx3220a";
 574                         break;
 575                 case 0x4260:
 576                         name = "vpx3216b";
 577                         decoder->ident = V4L2_IDENT_VPX3216B;
 578                         break;
 579                 case 0x4280:
 580                         name = "vpx3214c";
 581                         decoder->ident = V4L2_IDENT_VPX3214C;
 582                         break;
 583                 }
 584         }
 585         if (name)
 586                 v4l2_info(sd, "%s found @ 0x%x (%s)\n", name,
 587                         client->addr << 1, client->adapter->name);
 588         else
 589                 v4l2_info(sd, "chip (%02x:%04x) found @ 0x%x (%s)\n",
 590                         ver, pn, client->addr << 1, client->adapter->name);
 591
 592         vpx3220_write_block(sd, init_common, sizeof(init_common));
 593         vpx3220_write_fp_block(sd, init_fp, sizeof(init_fp) >> 1);
 594         /* Default to PAL */
 595         vpx3220_write_fp_block(sd, init_pal, sizeof(init_pal) >> 1);
 596         return 0;
 597 }
 598
 599 static int vpx3220_remove(struct i2c_client *client)
 600 {
 601         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 602
 603         v4l2_device_unregister_subdev(sd);
 604         kfree(to_vpx3220(sd));
 605         return 0;
 606 }
 607
 608 static const struct i2c_device_id vpx3220_id[] = {
 609         { "vpx3220a", 0 },
 610         { "vpx3216b", 0 },
 611         { "vpx3214c", 0 },
 612         { }
 613 };
 614 MODULE_DEVICE_TABLE(i2c, vpx3220_id);
 615
 616 static struct i2c_driver vpx3220_driver = {
 617         .driver = {
 618                 .owner  = THIS_MODULE,
 619                 .name   = "vpx3220",
 620         },
 621         .probe          = vpx3220_probe,
 622         .remove         = vpx3220_remove,
 623         .id_table       = vpx3220_id,
 624 };
 625
 626 static __init int init_vpx3220(void)
 627 {
 628         return i2c_add_driver(&vpx3220_driver);
 629 }
 630
 631 static __exit void exit_vpx3220(void)
 632 {
 633         i2c_del_driver(&vpx3220_driver);
 634 }
 635
 636 module_init(init_vpx3220);
 637 module_exit(exit_vpx3220);