1 /** 2 * 3 * GSPCA sub driver for W996[78]CF JPEG USB Dual Mode Camera Chip. 4 * 5 * Copyright (C) 2009 Hans de Goede <hdegoede@redhat.com> 6 * 7 * This module is adapted from the in kernel v4l1 w9968cf driver: 8 * 9 * Copyright (C) 2002-2004 by Luca Risolia <luca.risolia@studio.unibo.it> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 24 * 25 */ 26 27 /* Note this is not a stand alone driver, it gets included in ov519.c, this 28 is a bit of a hack, but it needs the driver code for a lot of different 29 ov sensors which is already present in ov519.c (the old v4l1 driver used 30 the ovchipcam framework). When we have the time we really should move 31 the sensor drivers to v4l2 sub drivers, and properly split of this 32 driver from ov519.c */ 33 34 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 35 36 #define W9968CF_I2C_BUS_DELAY 4 /* delay in us for I2C bit r/w operations */ 37 38 #define Y_QUANTABLE (&sd->jpeg_hdr[JPEG_QT0_OFFSET]) 39 #define UV_QUANTABLE (&sd->jpeg_hdr[JPEG_QT1_OFFSET]) 40 41 static const struct v4l2_pix_format w9968cf_vga_mode[] = { 42 {160, 120, V4L2_PIX_FMT_UYVY, V4L2_FIELD_NONE, 43 .bytesperline = 160 * 2, 44 .sizeimage = 160 * 120 * 2, 45 .colorspace = V4L2_COLORSPACE_JPEG}, 46 {176, 144, V4L2_PIX_FMT_UYVY, V4L2_FIELD_NONE, 47 .bytesperline = 176 * 2, 48 .sizeimage = 176 * 144 * 2, 49 .colorspace = V4L2_COLORSPACE_JPEG}, 50 {320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE, 51 .bytesperline = 320 * 2, 52 .sizeimage = 320 * 240 * 2, 53 .colorspace = V4L2_COLORSPACE_JPEG}, 54 {352, 288, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE, 55 .bytesperline = 352 * 2, 56 .sizeimage = 352 * 288 * 2, 57 .colorspace = V4L2_COLORSPACE_JPEG}, 58 {640, 480, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE, 59 .bytesperline = 640 * 2, 60 .sizeimage = 640 * 480 * 2, 61 .colorspace = V4L2_COLORSPACE_JPEG}, 62 }; 63 64 static void reg_w(struct sd *sd, u16 index, u16 value); 65 66 /*-------------------------------------------------------------------------- 67 Write 64-bit data to the fast serial bus registers. 68 Return 0 on success, -1 otherwise. 69 --------------------------------------------------------------------------*/ 70 static void w9968cf_write_fsb(struct sd *sd, u16* data) 71 { 72 struct usb_device *udev = sd->gspca_dev.dev; 73 u16 value; 74 int ret; 75 76 if (sd->gspca_dev.usb_err < 0) 77 return; 78 79 value = *data++; 80 memcpy(sd->gspca_dev.usb_buf, data, 6); 81 82 /* Avoid things going to fast for the bridge with a xhci host */ 83 udelay(150); 84 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0, 85 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE, 86 value, 0x06, sd->gspca_dev.usb_buf, 6, 500); 87 if (ret < 0) { 88 pr_err("Write FSB registers failed (%d)\n", ret); 89 sd->gspca_dev.usb_err = ret; 90 } 91 } 92 93 /*-------------------------------------------------------------------------- 94 Write data to the serial bus control register. 95 Return 0 on success, a negative number otherwise. 96 --------------------------------------------------------------------------*/ 97 static void w9968cf_write_sb(struct sd *sd, u16 value) 98 { 99 int ret; 100 101 if (sd->gspca_dev.usb_err < 0) 102 return; 103 104 /* Avoid things going to fast for the bridge with a xhci host */ 105 udelay(150); 106 107 /* We don't use reg_w here, as that would cause all writes when 108 bitbanging i2c to be logged, making the logs impossible to read */ 109 ret = usb_control_msg(sd->gspca_dev.dev, 110 usb_sndctrlpipe(sd->gspca_dev.dev, 0), 111 0, 112 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, 113 value, 0x01, NULL, 0, 500); 114 115 udelay(W9968CF_I2C_BUS_DELAY); 116 117 if (ret < 0) { 118 pr_err("Write SB reg [01] %04x failed\n", value); 119 sd->gspca_dev.usb_err = ret; 120 } 121 } 122 123 /*-------------------------------------------------------------------------- 124 Read data from the serial bus control register. 125 Return 0 on success, a negative number otherwise. 126 --------------------------------------------------------------------------*/ 127 static int w9968cf_read_sb(struct sd *sd) 128 { 129 int ret; 130 131 if (sd->gspca_dev.usb_err < 0) 132 return -1; 133 134 /* Avoid things going to fast for the bridge with a xhci host */ 135 udelay(150); 136 137 /* We don't use reg_r here, as the w9968cf is special and has 16 138 bit registers instead of 8 bit */ 139 ret = usb_control_msg(sd->gspca_dev.dev, 140 usb_rcvctrlpipe(sd->gspca_dev.dev, 0), 141 1, 142 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, 143 0, 0x01, sd->gspca_dev.usb_buf, 2, 500); 144 if (ret >= 0) { 145 ret = sd->gspca_dev.usb_buf[0] | 146 (sd->gspca_dev.usb_buf[1] << 8); 147 } else { 148 pr_err("Read SB reg [01] failed\n"); 149 sd->gspca_dev.usb_err = ret; 150 } 151 152 udelay(W9968CF_I2C_BUS_DELAY); 153 154 return ret; 155 } 156 157 /*-------------------------------------------------------------------------- 158 Upload quantization tables for the JPEG compression. 159 This function is called by w9968cf_start_transfer(). 160 Return 0 on success, a negative number otherwise. 161 --------------------------------------------------------------------------*/ 162 static void w9968cf_upload_quantizationtables(struct sd *sd) 163 { 164 u16 a, b; 165 int i, j; 166 167 reg_w(sd, 0x39, 0x0010); /* JPEG clock enable */ 168 169 for (i = 0, j = 0; i < 32; i++, j += 2) { 170 a = Y_QUANTABLE[j] | ((unsigned)(Y_QUANTABLE[j + 1]) << 8); 171 b = UV_QUANTABLE[j] | ((unsigned)(UV_QUANTABLE[j + 1]) << 8); 172 reg_w(sd, 0x40 + i, a); 173 reg_w(sd, 0x60 + i, b); 174 } 175 reg_w(sd, 0x39, 0x0012); /* JPEG encoder enable */ 176 } 177 178 /**************************************************************************** 179 * Low-level I2C I/O functions. * 180 * The adapter supports the following I2C transfer functions: * 181 * i2c_adap_fastwrite_byte_data() (at 400 kHz bit frequency only) * 182 * i2c_adap_read_byte_data() * 183 * i2c_adap_read_byte() * 184 ****************************************************************************/ 185 186 static void w9968cf_smbus_start(struct sd *sd) 187 { 188 w9968cf_write_sb(sd, 0x0011); /* SDE=1, SDA=0, SCL=1 */ 189 w9968cf_write_sb(sd, 0x0010); /* SDE=1, SDA=0, SCL=0 */ 190 } 191 192 static void w9968cf_smbus_stop(struct sd *sd) 193 { 194 w9968cf_write_sb(sd, 0x0010); /* SDE=1, SDA=0, SCL=0 */ 195 w9968cf_write_sb(sd, 0x0011); /* SDE=1, SDA=0, SCL=1 */ 196 w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */ 197 } 198 199 static void w9968cf_smbus_write_byte(struct sd *sd, u8 v) 200 { 201 u8 bit; 202 int sda; 203 204 for (bit = 0 ; bit < 8 ; bit++) { 205 sda = (v & 0x80) ? 2 : 0; 206 v <<= 1; 207 /* SDE=1, SDA=sda, SCL=0 */ 208 w9968cf_write_sb(sd, 0x10 | sda); 209 /* SDE=1, SDA=sda, SCL=1 */ 210 w9968cf_write_sb(sd, 0x11 | sda); 211 /* SDE=1, SDA=sda, SCL=0 */ 212 w9968cf_write_sb(sd, 0x10 | sda); 213 } 214 } 215 216 static void w9968cf_smbus_read_byte(struct sd *sd, u8 *v) 217 { 218 u8 bit; 219 220 /* No need to ensure SDA is high as we are always called after 221 read_ack which ends with SDA high */ 222 *v = 0; 223 for (bit = 0 ; bit < 8 ; bit++) { 224 *v <<= 1; 225 /* SDE=1, SDA=1, SCL=1 */ 226 w9968cf_write_sb(sd, 0x0013); 227 *v |= (w9968cf_read_sb(sd) & 0x0008) ? 1 : 0; 228 /* SDE=1, SDA=1, SCL=0 */ 229 w9968cf_write_sb(sd, 0x0012); 230 } 231 } 232 233 static void w9968cf_smbus_write_nack(struct sd *sd) 234 { 235 /* No need to ensure SDA is high as we are always called after 236 read_byte which ends with SDA high */ 237 w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */ 238 w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */ 239 } 240 241 static void w9968cf_smbus_read_ack(struct sd *sd) 242 { 243 struct gspca_dev *gspca_dev = (struct gspca_dev *)sd; 244 int sda; 245 246 /* Ensure SDA is high before raising clock to avoid a spurious stop */ 247 w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */ 248 w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */ 249 sda = w9968cf_read_sb(sd); 250 w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */ 251 if (sda >= 0 && (sda & 0x08)) { 252 PDEBUG(D_USBI, "Did not receive i2c ACK"); 253 sd->gspca_dev.usb_err = -EIO; 254 } 255 } 256 257 /* SMBus protocol: S Addr Wr [A] Subaddr [A] Value [A] P */ 258 static void w9968cf_i2c_w(struct sd *sd, u8 reg, u8 value) 259 { 260 struct gspca_dev *gspca_dev = (struct gspca_dev *)sd; 261 u16* data = (u16 *)sd->gspca_dev.usb_buf; 262 263 data[0] = 0x082f | ((sd->sensor_addr & 0x80) ? 0x1500 : 0x0); 264 data[0] |= (sd->sensor_addr & 0x40) ? 0x4000 : 0x0; 265 data[1] = 0x2082 | ((sd->sensor_addr & 0x40) ? 0x0005 : 0x0); 266 data[1] |= (sd->sensor_addr & 0x20) ? 0x0150 : 0x0; 267 data[1] |= (sd->sensor_addr & 0x10) ? 0x5400 : 0x0; 268 data[2] = 0x8208 | ((sd->sensor_addr & 0x08) ? 0x0015 : 0x0); 269 data[2] |= (sd->sensor_addr & 0x04) ? 0x0540 : 0x0; 270 data[2] |= (sd->sensor_addr & 0x02) ? 0x5000 : 0x0; 271 data[3] = 0x1d20 | ((sd->sensor_addr & 0x02) ? 0x0001 : 0x0); 272 data[3] |= (sd->sensor_addr & 0x01) ? 0x0054 : 0x0; 273 274 w9968cf_write_fsb(sd, data); 275 276 data[0] = 0x8208 | ((reg & 0x80) ? 0x0015 : 0x0); 277 data[0] |= (reg & 0x40) ? 0x0540 : 0x0; 278 data[0] |= (reg & 0x20) ? 0x5000 : 0x0; 279 data[1] = 0x0820 | ((reg & 0x20) ? 0x0001 : 0x0); 280 data[1] |= (reg & 0x10) ? 0x0054 : 0x0; 281 data[1] |= (reg & 0x08) ? 0x1500 : 0x0; 282 data[1] |= (reg & 0x04) ? 0x4000 : 0x0; 283 data[2] = 0x2082 | ((reg & 0x04) ? 0x0005 : 0x0); 284 data[2] |= (reg & 0x02) ? 0x0150 : 0x0; 285 data[2] |= (reg & 0x01) ? 0x5400 : 0x0; 286 data[3] = 0x001d; 287 288 w9968cf_write_fsb(sd, data); 289 290 data[0] = 0x8208 | ((value & 0x80) ? 0x0015 : 0x0); 291 data[0] |= (value & 0x40) ? 0x0540 : 0x0; 292 data[0] |= (value & 0x20) ? 0x5000 : 0x0; 293 data[1] = 0x0820 | ((value & 0x20) ? 0x0001 : 0x0); 294 data[1] |= (value & 0x10) ? 0x0054 : 0x0; 295 data[1] |= (value & 0x08) ? 0x1500 : 0x0; 296 data[1] |= (value & 0x04) ? 0x4000 : 0x0; 297 data[2] = 0x2082 | ((value & 0x04) ? 0x0005 : 0x0); 298 data[2] |= (value & 0x02) ? 0x0150 : 0x0; 299 data[2] |= (value & 0x01) ? 0x5400 : 0x0; 300 data[3] = 0xfe1d; 301 302 w9968cf_write_fsb(sd, data); 303 304 PDEBUG(D_USBO, "i2c 0x%02x -> [0x%02x]", value, reg); 305 } 306 307 /* SMBus protocol: S Addr Wr [A] Subaddr [A] P S Addr+1 Rd [A] [Value] NA P */ 308 static int w9968cf_i2c_r(struct sd *sd, u8 reg) 309 { 310 struct gspca_dev *gspca_dev = (struct gspca_dev *)sd; 311 int ret = 0; 312 u8 value; 313 314 /* Fast serial bus data control disable */ 315 w9968cf_write_sb(sd, 0x0013); /* don't change ! */ 316 317 w9968cf_smbus_start(sd); 318 w9968cf_smbus_write_byte(sd, sd->sensor_addr); 319 w9968cf_smbus_read_ack(sd); 320 w9968cf_smbus_write_byte(sd, reg); 321 w9968cf_smbus_read_ack(sd); 322 w9968cf_smbus_stop(sd); 323 w9968cf_smbus_start(sd); 324 w9968cf_smbus_write_byte(sd, sd->sensor_addr + 1); 325 w9968cf_smbus_read_ack(sd); 326 w9968cf_smbus_read_byte(sd, &value); 327 /* signal we don't want to read anymore, the v4l1 driver used to 328 send an ack here which is very wrong! (and then fixed 329 the issues this gave by retrying reads) */ 330 w9968cf_smbus_write_nack(sd); 331 w9968cf_smbus_stop(sd); 332 333 /* Fast serial bus data control re-enable */ 334 w9968cf_write_sb(sd, 0x0030); 335 336 if (sd->gspca_dev.usb_err >= 0) { 337 ret = value; 338 PDEBUG(D_USBI, "i2c [0x%02X] -> 0x%02X", reg, value); 339 } else 340 PERR("i2c read [0x%02x] failed", reg); 341 342 return ret; 343 } 344 345 /*-------------------------------------------------------------------------- 346 Turn on the LED on some webcams. A beep should be heard too. 347 Return 0 on success, a negative number otherwise. 348 --------------------------------------------------------------------------*/ 349 static void w9968cf_configure(struct sd *sd) 350 { 351 reg_w(sd, 0x00, 0xff00); /* power-down */ 352 reg_w(sd, 0x00, 0xbf17); /* reset everything */ 353 reg_w(sd, 0x00, 0xbf10); /* normal operation */ 354 reg_w(sd, 0x01, 0x0010); /* serial bus, SDS high */ 355 reg_w(sd, 0x01, 0x0000); /* serial bus, SDS low */ 356 reg_w(sd, 0x01, 0x0010); /* ..high 'beep-beep' */ 357 reg_w(sd, 0x01, 0x0030); /* Set sda scl to FSB mode */ 358 359 sd->stopped = 1; 360 } 361 362 static void w9968cf_init(struct sd *sd) 363 { 364 unsigned long hw_bufsize = sd->sif ? (352 * 288 * 2) : (640 * 480 * 2), 365 y0 = 0x0000, 366 u0 = y0 + hw_bufsize / 2, 367 v0 = u0 + hw_bufsize / 4, 368 y1 = v0 + hw_bufsize / 4, 369 u1 = y1 + hw_bufsize / 2, 370 v1 = u1 + hw_bufsize / 4; 371 372 reg_w(sd, 0x00, 0xff00); /* power off */ 373 reg_w(sd, 0x00, 0xbf10); /* power on */ 374 375 reg_w(sd, 0x03, 0x405d); /* DRAM timings */ 376 reg_w(sd, 0x04, 0x0030); /* SDRAM timings */ 377 378 reg_w(sd, 0x20, y0 & 0xffff); /* Y buf.0, low */ 379 reg_w(sd, 0x21, y0 >> 16); /* Y buf.0, high */ 380 reg_w(sd, 0x24, u0 & 0xffff); /* U buf.0, low */ 381 reg_w(sd, 0x25, u0 >> 16); /* U buf.0, high */ 382 reg_w(sd, 0x28, v0 & 0xffff); /* V buf.0, low */ 383 reg_w(sd, 0x29, v0 >> 16); /* V buf.0, high */ 384 385 reg_w(sd, 0x22, y1 & 0xffff); /* Y buf.1, low */ 386 reg_w(sd, 0x23, y1 >> 16); /* Y buf.1, high */ 387 reg_w(sd, 0x26, u1 & 0xffff); /* U buf.1, low */ 388 reg_w(sd, 0x27, u1 >> 16); /* U buf.1, high */ 389 reg_w(sd, 0x2a, v1 & 0xffff); /* V buf.1, low */ 390 reg_w(sd, 0x2b, v1 >> 16); /* V buf.1, high */ 391 392 reg_w(sd, 0x32, y1 & 0xffff); /* JPEG buf 0 low */ 393 reg_w(sd, 0x33, y1 >> 16); /* JPEG buf 0 high */ 394 395 reg_w(sd, 0x34, y1 & 0xffff); /* JPEG buf 1 low */ 396 reg_w(sd, 0x35, y1 >> 16); /* JPEG bug 1 high */ 397 398 reg_w(sd, 0x36, 0x0000);/* JPEG restart interval */ 399 reg_w(sd, 0x37, 0x0804);/*JPEG VLE FIFO threshold*/ 400 reg_w(sd, 0x38, 0x0000);/* disable hw up-scaling */ 401 reg_w(sd, 0x3f, 0x0000); /* JPEG/MCTL test data */ 402 } 403 404 static void w9968cf_set_crop_window(struct sd *sd) 405 { 406 int start_cropx, start_cropy, x, y, fw, fh, cw, ch, 407 max_width, max_height; 408 409 if (sd->sif) { 410 max_width = 352; 411 max_height = 288; 412 } else { 413 max_width = 640; 414 max_height = 480; 415 } 416 417 if (sd->sensor == SEN_OV7620) { 418 /* 419 * Sigh, this is dependend on the clock / framerate changes 420 * made by the frequency control, sick. 421 * 422 * Note we cannot use v4l2_ctrl_g_ctrl here, as we get called 423 * from ov519.c:setfreq() with the ctrl lock held! 424 */ 425 if (sd->freq->val == 1) { 426 start_cropx = 277; 427 start_cropy = 37; 428 } else { 429 start_cropx = 105; 430 start_cropy = 37; 431 } 432 } else { 433 start_cropx = 320; 434 start_cropy = 35; 435 } 436 437 /* Work around to avoid FP arithmetics */ 438 #define SC(x) ((x) << 10) 439 440 /* Scaling factors */ 441 fw = SC(sd->gspca_dev.pixfmt.width) / max_width; 442 fh = SC(sd->gspca_dev.pixfmt.height) / max_height; 443 444 cw = (fw >= fh) ? max_width : SC(sd->gspca_dev.pixfmt.width) / fh; 445 ch = (fw >= fh) ? SC(sd->gspca_dev.pixfmt.height) / fw : max_height; 446 447 sd->sensor_width = max_width; 448 sd->sensor_height = max_height; 449 450 x = (max_width - cw) / 2; 451 y = (max_height - ch) / 2; 452 453 reg_w(sd, 0x10, start_cropx + x); 454 reg_w(sd, 0x11, start_cropy + y); 455 reg_w(sd, 0x12, start_cropx + x + cw); 456 reg_w(sd, 0x13, start_cropy + y + ch); 457 } 458 459 static void w9968cf_mode_init_regs(struct sd *sd) 460 { 461 int val, vs_polarity, hs_polarity; 462 463 w9968cf_set_crop_window(sd); 464 465 reg_w(sd, 0x14, sd->gspca_dev.pixfmt.width); 466 reg_w(sd, 0x15, sd->gspca_dev.pixfmt.height); 467 468 /* JPEG width & height */ 469 reg_w(sd, 0x30, sd->gspca_dev.pixfmt.width); 470 reg_w(sd, 0x31, sd->gspca_dev.pixfmt.height); 471 472 /* Y & UV frame buffer strides (in WORD) */ 473 if (w9968cf_vga_mode[sd->gspca_dev.curr_mode].pixelformat == 474 V4L2_PIX_FMT_JPEG) { 475 reg_w(sd, 0x2c, sd->gspca_dev.pixfmt.width / 2); 476 reg_w(sd, 0x2d, sd->gspca_dev.pixfmt.width / 4); 477 } else 478 reg_w(sd, 0x2c, sd->gspca_dev.pixfmt.width); 479 480 reg_w(sd, 0x00, 0xbf17); /* reset everything */ 481 reg_w(sd, 0x00, 0xbf10); /* normal operation */ 482 483 /* Transfer size in WORDS (for UYVY format only) */ 484 val = sd->gspca_dev.pixfmt.width * sd->gspca_dev.pixfmt.height; 485 reg_w(sd, 0x3d, val & 0xffff); /* low bits */ 486 reg_w(sd, 0x3e, val >> 16); /* high bits */ 487 488 if (w9968cf_vga_mode[sd->gspca_dev.curr_mode].pixelformat == 489 V4L2_PIX_FMT_JPEG) { 490 /* We may get called multiple times (usb isoc bw negotiat.) */ 491 jpeg_define(sd->jpeg_hdr, sd->gspca_dev.pixfmt.height, 492 sd->gspca_dev.pixfmt.width, 0x22); /* JPEG 420 */ 493 jpeg_set_qual(sd->jpeg_hdr, v4l2_ctrl_g_ctrl(sd->jpegqual)); 494 w9968cf_upload_quantizationtables(sd); 495 v4l2_ctrl_grab(sd->jpegqual, true); 496 } 497 498 /* Video Capture Control Register */ 499 if (sd->sensor == SEN_OV7620) { 500 /* Seems to work around a bug in the image sensor */ 501 vs_polarity = 1; 502 hs_polarity = 1; 503 } else { 504 vs_polarity = 1; 505 hs_polarity = 0; 506 } 507 508 val = (vs_polarity << 12) | (hs_polarity << 11); 509 510 /* NOTE: We may not have enough memory to do double buffering while 511 doing compression (amount of memory differs per model cam). 512 So we use the second image buffer also as jpeg stream buffer 513 (see w9968cf_init), and disable double buffering. */ 514 if (w9968cf_vga_mode[sd->gspca_dev.curr_mode].pixelformat == 515 V4L2_PIX_FMT_JPEG) { 516 /* val |= 0x0002; YUV422P */ 517 val |= 0x0003; /* YUV420P */ 518 } else 519 val |= 0x0080; /* Enable HW double buffering */ 520 521 /* val |= 0x0020; enable clamping */ 522 /* val |= 0x0008; enable (1-2-1) filter */ 523 /* val |= 0x000c; enable (2-3-6-3-2) filter */ 524 525 val |= 0x8000; /* capt. enable */ 526 527 reg_w(sd, 0x16, val); 528 529 sd->gspca_dev.empty_packet = 0; 530 } 531 532 static void w9968cf_stop0(struct sd *sd) 533 { 534 v4l2_ctrl_grab(sd->jpegqual, false); 535 reg_w(sd, 0x39, 0x0000); /* disable JPEG encoder */ 536 reg_w(sd, 0x16, 0x0000); /* stop video capture */ 537 } 538 539 /* The w9968cf docs say that a 0 sized packet means EOF (and also SOF 540 for the next frame). This seems to simply not be true when operating 541 in JPEG mode, in this case there may be empty packets within the 542 frame. So in JPEG mode use the JPEG SOI marker to detect SOF. 543 544 Note to make things even more interesting the w9968cf sends *PLANAR* jpeg, 545 to be precise it sends: SOI, SOF, DRI, SOS, Y-data, SOS, U-data, SOS, 546 V-data, EOI. */ 547 static void w9968cf_pkt_scan(struct gspca_dev *gspca_dev, 548 u8 *data, /* isoc packet */ 549 int len) /* iso packet length */ 550 { 551 struct sd *sd = (struct sd *) gspca_dev; 552 553 if (w9968cf_vga_mode[gspca_dev->curr_mode].pixelformat == 554 V4L2_PIX_FMT_JPEG) { 555 if (len >= 2 && 556 data[0] == 0xff && 557 data[1] == 0xd8) { 558 gspca_frame_add(gspca_dev, LAST_PACKET, 559 NULL, 0); 560 gspca_frame_add(gspca_dev, FIRST_PACKET, 561 sd->jpeg_hdr, JPEG_HDR_SZ); 562 /* Strip the ff d8, our own header (which adds 563 huffman and quantization tables) already has this */ 564 len -= 2; 565 data += 2; 566 } 567 } else { 568 /* In UYVY mode an empty packet signals EOF */ 569 if (gspca_dev->empty_packet) { 570 gspca_frame_add(gspca_dev, LAST_PACKET, 571 NULL, 0); 572 gspca_frame_add(gspca_dev, FIRST_PACKET, 573 NULL, 0); 574 gspca_dev->empty_packet = 0; 575 } 576 } 577 gspca_frame_add(gspca_dev, INTER_PACKET, data, len); 578 } 579