?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
sfc: Don't use enums as a bitmask.
[zen-stable.git] / drivers / media / video / gspca / w996Xcf.c
blob4a9e622e5e1bf677d9c8d19c61238beddbc7a17c
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 W9968CF_I2C_BUS_DELAY 4 /* delay in us for I2C bit r/w operations */
35
36 #define Y_QUANTABLE (&sd->jpeg_hdr[JPEG_QT0_OFFSET])
37 #define UV_QUANTABLE (&sd->jpeg_hdr[JPEG_QT1_OFFSET])
38
39 static const struct v4l2_pix_format w9968cf_vga_mode[] = {
40 {160, 120, V4L2_PIX_FMT_UYVY, V4L2_FIELD_NONE,
41 .bytesperline = 160 * 2,
42 .sizeimage = 160 * 120 * 2,
43 .colorspace = V4L2_COLORSPACE_JPEG},
44 {176, 144, V4L2_PIX_FMT_UYVY, V4L2_FIELD_NONE,
45 .bytesperline = 176 * 2,
46 .sizeimage = 176 * 144 * 2,
47 .colorspace = V4L2_COLORSPACE_JPEG},
48 {320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
49 .bytesperline = 320 * 2,
50 .sizeimage = 320 * 240 * 2,
51 .colorspace = V4L2_COLORSPACE_JPEG},
52 {352, 288, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
53 .bytesperline = 352 * 2,
54 .sizeimage = 352 * 288 * 2,
55 .colorspace = V4L2_COLORSPACE_JPEG},
56 {640, 480, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
57 .bytesperline = 640 * 2,
58 .sizeimage = 640 * 480 * 2,
59 .colorspace = V4L2_COLORSPACE_JPEG},
60 };
61
62 static void reg_w(struct sd *sd, u16 index, u16 value);
63
64 /*--------------------------------------------------------------------------
65 Write 64-bit data to the fast serial bus registers.
66 Return 0 on success, -1 otherwise.
67 --------------------------------------------------------------------------*/
68 static void w9968cf_write_fsb(struct sd *sd, u16* data)
69 {
70 struct usb_device *udev = sd->gspca_dev.dev;
71 u16 value;
72 int ret;
73
74 if (sd->gspca_dev.usb_err < 0)
75 return;
76
77 value = *data++;
78 memcpy(sd->gspca_dev.usb_buf, data, 6);
79
80 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0,
81 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
82 value, 0x06, sd->gspca_dev.usb_buf, 6, 500);
83 if (ret < 0) {
84 err("Write FSB registers failed (%d)", ret);
85 sd->gspca_dev.usb_err = ret;
86 }
87 }
88
89 /*--------------------------------------------------------------------------
90 Write data to the serial bus control register.
91 Return 0 on success, a negative number otherwise.
92 --------------------------------------------------------------------------*/
93 static void w9968cf_write_sb(struct sd *sd, u16 value)
94 {
95 int ret;
96
97 if (sd->gspca_dev.usb_err < 0)
98 return;
99
100 /* We don't use reg_w here, as that would cause all writes when
101 bitbanging i2c to be logged, making the logs impossible to read */
102 ret = usb_control_msg(sd->gspca_dev.dev,
103 usb_sndctrlpipe(sd->gspca_dev.dev, 0),
104 0,
105 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
106 value, 0x01, NULL, 0, 500);
107
108 udelay(W9968CF_I2C_BUS_DELAY);
109
110 if (ret < 0) {
111 err("Write SB reg [01] %04x failed", value);
112 sd->gspca_dev.usb_err = ret;
113 }
114 }
115
116 /*--------------------------------------------------------------------------
117 Read data from the serial bus control register.
118 Return 0 on success, a negative number otherwise.
119 --------------------------------------------------------------------------*/
120 static int w9968cf_read_sb(struct sd *sd)
121 {
122 int ret;
123
124 if (sd->gspca_dev.usb_err < 0)
125 return -1;
126
127 /* We don't use reg_r here, as the w9968cf is special and has 16
128 bit registers instead of 8 bit */
129 ret = usb_control_msg(sd->gspca_dev.dev,
130 usb_rcvctrlpipe(sd->gspca_dev.dev, 0),
131 1,
132 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
133 0, 0x01, sd->gspca_dev.usb_buf, 2, 500);
134 if (ret >= 0) {
135 ret = sd->gspca_dev.usb_buf[0] |
136 (sd->gspca_dev.usb_buf[1] << 8);
137 } else {
138 err("Read SB reg [01] failed");
139 sd->gspca_dev.usb_err = ret;
140 }
141
142 udelay(W9968CF_I2C_BUS_DELAY);
143
144 return ret;
145 }
146
147 /*--------------------------------------------------------------------------
148 Upload quantization tables for the JPEG compression.
149 This function is called by w9968cf_start_transfer().
150 Return 0 on success, a negative number otherwise.
151 --------------------------------------------------------------------------*/
152 static void w9968cf_upload_quantizationtables(struct sd *sd)
153 {
154 u16 a, b;
155 int i, j;
156
157 reg_w(sd, 0x39, 0x0010); /* JPEG clock enable */
158
159 for (i = 0, j = 0; i < 32; i++, j += 2) {
160 a = Y_QUANTABLE[j] | ((unsigned)(Y_QUANTABLE[j + 1]) << 8);
161 b = UV_QUANTABLE[j] | ((unsigned)(UV_QUANTABLE[j + 1]) << 8);
162 reg_w(sd, 0x40 + i, a);
163 reg_w(sd, 0x60 + i, b);
164 }
165 reg_w(sd, 0x39, 0x0012); /* JPEG encoder enable */
166 }
167
168 /****************************************************************************
169 * Low-level I2C I/O functions. *
170 * The adapter supports the following I2C transfer functions: *
171 * i2c_adap_fastwrite_byte_data() (at 400 kHz bit frequency only) *
172 * i2c_adap_read_byte_data() *
173 * i2c_adap_read_byte() *
174 ****************************************************************************/
175
176 static void w9968cf_smbus_start(struct sd *sd)
177 {
178 w9968cf_write_sb(sd, 0x0011); /* SDE=1, SDA=0, SCL=1 */
179 w9968cf_write_sb(sd, 0x0010); /* SDE=1, SDA=0, SCL=0 */
180 }
181
182 static void w9968cf_smbus_stop(struct sd *sd)
183 {
184 w9968cf_write_sb(sd, 0x0010); /* SDE=1, SDA=0, SCL=0 */
185 w9968cf_write_sb(sd, 0x0011); /* SDE=1, SDA=0, SCL=1 */
186 w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */
187 }
188
189 static void w9968cf_smbus_write_byte(struct sd *sd, u8 v)
190 {
191 u8 bit;
192 int sda;
193
194 for (bit = 0 ; bit < 8 ; bit++) {
195 sda = (v & 0x80) ? 2 : 0;
196 v <<= 1;
197 /* SDE=1, SDA=sda, SCL=0 */
198 w9968cf_write_sb(sd, 0x10 | sda);
199 /* SDE=1, SDA=sda, SCL=1 */
200 w9968cf_write_sb(sd, 0x11 | sda);
201 /* SDE=1, SDA=sda, SCL=0 */
202 w9968cf_write_sb(sd, 0x10 | sda);
203 }
204 }
205
206 static void w9968cf_smbus_read_byte(struct sd *sd, u8 *v)
207 {
208 u8 bit;
209
210 /* No need to ensure SDA is high as we are always called after
211 read_ack which ends with SDA high */
212 *v = 0;
213 for (bit = 0 ; bit < 8 ; bit++) {
214 *v <<= 1;
215 /* SDE=1, SDA=1, SCL=1 */
216 w9968cf_write_sb(sd, 0x0013);
217 *v |= (w9968cf_read_sb(sd) & 0x0008) ? 1 : 0;
218 /* SDE=1, SDA=1, SCL=0 */
219 w9968cf_write_sb(sd, 0x0012);
220 }
221 }
222
223 static void w9968cf_smbus_write_nack(struct sd *sd)
224 {
225 /* No need to ensure SDA is high as we are always called after
226 read_byte which ends with SDA high */
227 w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */
228 w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */
229 }
230
231 static void w9968cf_smbus_read_ack(struct sd *sd)
232 {
233 int sda;
234
235 /* Ensure SDA is high before raising clock to avoid a spurious stop */
236 w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */
237 w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */
238 sda = w9968cf_read_sb(sd);
239 w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */
240 if (sda >= 0 && (sda & 0x08)) {
241 PDEBUG(D_USBI, "Did not receive i2c ACK");
242 sd->gspca_dev.usb_err = -EIO;
243 }
244 }
245
246 /* SMBus protocol: S Addr Wr [A] Subaddr [A] Value [A] P */
247 static void w9968cf_i2c_w(struct sd *sd, u8 reg, u8 value)
248 {
249 u16* data = (u16 *)sd->gspca_dev.usb_buf;
250
251 data[0] = 0x082f | ((sd->sensor_addr & 0x80) ? 0x1500 : 0x0);
252 data[0] |= (sd->sensor_addr & 0x40) ? 0x4000 : 0x0;
253 data[1] = 0x2082 | ((sd->sensor_addr & 0x40) ? 0x0005 : 0x0);
254 data[1] |= (sd->sensor_addr & 0x20) ? 0x0150 : 0x0;
255 data[1] |= (sd->sensor_addr & 0x10) ? 0x5400 : 0x0;
256 data[2] = 0x8208 | ((sd->sensor_addr & 0x08) ? 0x0015 : 0x0);
257 data[2] |= (sd->sensor_addr & 0x04) ? 0x0540 : 0x0;
258 data[2] |= (sd->sensor_addr & 0x02) ? 0x5000 : 0x0;
259 data[3] = 0x1d20 | ((sd->sensor_addr & 0x02) ? 0x0001 : 0x0);
260 data[3] |= (sd->sensor_addr & 0x01) ? 0x0054 : 0x0;
261
262 w9968cf_write_fsb(sd, data);
263
264 data[0] = 0x8208 | ((reg & 0x80) ? 0x0015 : 0x0);
265 data[0] |= (reg & 0x40) ? 0x0540 : 0x0;
266 data[0] |= (reg & 0x20) ? 0x5000 : 0x0;
267 data[1] = 0x0820 | ((reg & 0x20) ? 0x0001 : 0x0);
268 data[1] |= (reg & 0x10) ? 0x0054 : 0x0;
269 data[1] |= (reg & 0x08) ? 0x1500 : 0x0;
270 data[1] |= (reg & 0x04) ? 0x4000 : 0x0;
271 data[2] = 0x2082 | ((reg & 0x04) ? 0x0005 : 0x0);
272 data[2] |= (reg & 0x02) ? 0x0150 : 0x0;
273 data[2] |= (reg & 0x01) ? 0x5400 : 0x0;
274 data[3] = 0x001d;
275
276 w9968cf_write_fsb(sd, data);
277
278 data[0] = 0x8208 | ((value & 0x80) ? 0x0015 : 0x0);
279 data[0] |= (value & 0x40) ? 0x0540 : 0x0;
280 data[0] |= (value & 0x20) ? 0x5000 : 0x0;
281 data[1] = 0x0820 | ((value & 0x20) ? 0x0001 : 0x0);
282 data[1] |= (value & 0x10) ? 0x0054 : 0x0;
283 data[1] |= (value & 0x08) ? 0x1500 : 0x0;
284 data[1] |= (value & 0x04) ? 0x4000 : 0x0;
285 data[2] = 0x2082 | ((value & 0x04) ? 0x0005 : 0x0);
286 data[2] |= (value & 0x02) ? 0x0150 : 0x0;
287 data[2] |= (value & 0x01) ? 0x5400 : 0x0;
288 data[3] = 0xfe1d;
289
290 w9968cf_write_fsb(sd, data);
291
292 PDEBUG(D_USBO, "i2c 0x%02x -> [0x%02x]", value, reg);
293 }
294
295 /* SMBus protocol: S Addr Wr [A] Subaddr [A] P S Addr+1 Rd [A] [Value] NA P */
296 static int w9968cf_i2c_r(struct sd *sd, u8 reg)
297 {
298 int ret = 0;
299 u8 value;
300
301 /* Fast serial bus data control disable */
302 w9968cf_write_sb(sd, 0x0013); /* don't change ! */
303
304 w9968cf_smbus_start(sd);
305 w9968cf_smbus_write_byte(sd, sd->sensor_addr);
306 w9968cf_smbus_read_ack(sd);
307 w9968cf_smbus_write_byte(sd, reg);
308 w9968cf_smbus_read_ack(sd);
309 w9968cf_smbus_stop(sd);
310 w9968cf_smbus_start(sd);
311 w9968cf_smbus_write_byte(sd, sd->sensor_addr + 1);
312 w9968cf_smbus_read_ack(sd);
313 w9968cf_smbus_read_byte(sd, &value);
314 /* signal we don't want to read anymore, the v4l1 driver used to
315 send an ack here which is very wrong! (and then fixed
316 the issues this gave by retrying reads) */
317 w9968cf_smbus_write_nack(sd);
318 w9968cf_smbus_stop(sd);
319
320 /* Fast serial bus data control re-enable */
321 w9968cf_write_sb(sd, 0x0030);
322
323 if (sd->gspca_dev.usb_err >= 0) {
324 ret = value;
325 PDEBUG(D_USBI, "i2c [0x%02X] -> 0x%02X", reg, value);
326 } else
327 PDEBUG(D_ERR, "i2c read [0x%02x] failed", reg);
328
329 return ret;
330 }
331
332 /*--------------------------------------------------------------------------
333 Turn on the LED on some webcams. A beep should be heard too.
334 Return 0 on success, a negative number otherwise.
335 --------------------------------------------------------------------------*/
336 static void w9968cf_configure(struct sd *sd)
337 {
338 reg_w(sd, 0x00, 0xff00); /* power-down */
339 reg_w(sd, 0x00, 0xbf17); /* reset everything */
340 reg_w(sd, 0x00, 0xbf10); /* normal operation */
341 reg_w(sd, 0x01, 0x0010); /* serial bus, SDS high */
342 reg_w(sd, 0x01, 0x0000); /* serial bus, SDS low */
343 reg_w(sd, 0x01, 0x0010); /* ..high 'beep-beep' */
344 reg_w(sd, 0x01, 0x0030); /* Set sda scl to FSB mode */
345
346 sd->stopped = 1;
347 }
348
349 static void w9968cf_init(struct sd *sd)
350 {
351 unsigned long hw_bufsize = sd->sif ? (352 * 288 * 2) : (640 * 480 * 2),
352 y0 = 0x0000,
353 u0 = y0 + hw_bufsize / 2,
354 v0 = u0 + hw_bufsize / 4,
355 y1 = v0 + hw_bufsize / 4,
356 u1 = y1 + hw_bufsize / 2,
357 v1 = u1 + hw_bufsize / 4;
358
359 reg_w(sd, 0x00, 0xff00); /* power off */
360 reg_w(sd, 0x00, 0xbf10); /* power on */
361
362 reg_w(sd, 0x03, 0x405d); /* DRAM timings */
363 reg_w(sd, 0x04, 0x0030); /* SDRAM timings */
364
365 reg_w(sd, 0x20, y0 & 0xffff); /* Y buf.0, low */
366 reg_w(sd, 0x21, y0 >> 16); /* Y buf.0, high */
367 reg_w(sd, 0x24, u0 & 0xffff); /* U buf.0, low */
368 reg_w(sd, 0x25, u0 >> 16); /* U buf.0, high */
369 reg_w(sd, 0x28, v0 & 0xffff); /* V buf.0, low */
370 reg_w(sd, 0x29, v0 >> 16); /* V buf.0, high */
371
372 reg_w(sd, 0x22, y1 & 0xffff); /* Y buf.1, low */
373 reg_w(sd, 0x23, y1 >> 16); /* Y buf.1, high */
374 reg_w(sd, 0x26, u1 & 0xffff); /* U buf.1, low */
375 reg_w(sd, 0x27, u1 >> 16); /* U buf.1, high */
376 reg_w(sd, 0x2a, v1 & 0xffff); /* V buf.1, low */
377 reg_w(sd, 0x2b, v1 >> 16); /* V buf.1, high */
378
379 reg_w(sd, 0x32, y1 & 0xffff); /* JPEG buf 0 low */
380 reg_w(sd, 0x33, y1 >> 16); /* JPEG buf 0 high */
381
382 reg_w(sd, 0x34, y1 & 0xffff); /* JPEG buf 1 low */
383 reg_w(sd, 0x35, y1 >> 16); /* JPEG bug 1 high */
384
385 reg_w(sd, 0x36, 0x0000);/* JPEG restart interval */
386 reg_w(sd, 0x37, 0x0804);/*JPEG VLE FIFO threshold*/
387 reg_w(sd, 0x38, 0x0000);/* disable hw up-scaling */
388 reg_w(sd, 0x3f, 0x0000); /* JPEG/MCTL test data */
389 }
390
391 static void w9968cf_set_crop_window(struct sd *sd)
392 {
393 int start_cropx, start_cropy, x, y, fw, fh, cw, ch,
394 max_width, max_height;
395
396 if (sd->sif) {
397 max_width = 352;
398 max_height = 288;
399 } else {
400 max_width = 640;
401 max_height = 480;
402 }
403
404 if (sd->sensor == SEN_OV7620) {
405 /* Sigh, this is dependend on the clock / framerate changes
406 made by the frequency control, sick. */
407 if (sd->ctrls[FREQ].val == 1) {
408 start_cropx = 277;
409 start_cropy = 37;
410 } else {
411 start_cropx = 105;
412 start_cropy = 37;
413 }
414 } else {
415 start_cropx = 320;
416 start_cropy = 35;
417 }
418
419 /* Work around to avoid FP arithmetics */
420 #define SC(x) ((x) << 10)
421
422 /* Scaling factors */
423 fw = SC(sd->gspca_dev.width) / max_width;
424 fh = SC(sd->gspca_dev.height) / max_height;
425
426 cw = (fw >= fh) ? max_width : SC(sd->gspca_dev.width) / fh;
427 ch = (fw >= fh) ? SC(sd->gspca_dev.height) / fw : max_height;
428
429 sd->sensor_width = max_width;
430 sd->sensor_height = max_height;
431
432 x = (max_width - cw) / 2;
433 y = (max_height - ch) / 2;
434
435 reg_w(sd, 0x10, start_cropx + x);
436 reg_w(sd, 0x11, start_cropy + y);
437 reg_w(sd, 0x12, start_cropx + x + cw);
438 reg_w(sd, 0x13, start_cropy + y + ch);
439 }
440
441 static void w9968cf_mode_init_regs(struct sd *sd)
442 {
443 int val, vs_polarity, hs_polarity;
444
445 w9968cf_set_crop_window(sd);
446
447 reg_w(sd, 0x14, sd->gspca_dev.width);
448 reg_w(sd, 0x15, sd->gspca_dev.height);
449
450 /* JPEG width & height */
451 reg_w(sd, 0x30, sd->gspca_dev.width);
452 reg_w(sd, 0x31, sd->gspca_dev.height);
453
454 /* Y & UV frame buffer strides (in WORD) */
455 if (w9968cf_vga_mode[sd->gspca_dev.curr_mode].pixelformat ==
456 V4L2_PIX_FMT_JPEG) {
457 reg_w(sd, 0x2c, sd->gspca_dev.width / 2);
458 reg_w(sd, 0x2d, sd->gspca_dev.width / 4);
459 } else
460 reg_w(sd, 0x2c, sd->gspca_dev.width);
461
462 reg_w(sd, 0x00, 0xbf17); /* reset everything */
463 reg_w(sd, 0x00, 0xbf10); /* normal operation */
464
465 /* Transfer size in WORDS (for UYVY format only) */
466 val = sd->gspca_dev.width * sd->gspca_dev.height;
467 reg_w(sd, 0x3d, val & 0xffff); /* low bits */
468 reg_w(sd, 0x3e, val >> 16); /* high bits */
469
470 if (w9968cf_vga_mode[sd->gspca_dev.curr_mode].pixelformat ==
471 V4L2_PIX_FMT_JPEG) {
472 /* We may get called multiple times (usb isoc bw negotiat.) */
473 jpeg_define(sd->jpeg_hdr, sd->gspca_dev.height,
474 sd->gspca_dev.width, 0x22); /* JPEG 420 */
475 jpeg_set_qual(sd->jpeg_hdr, sd->quality);
476 w9968cf_upload_quantizationtables(sd);
477 }
478
479 /* Video Capture Control Register */
480 if (sd->sensor == SEN_OV7620) {
481 /* Seems to work around a bug in the image sensor */
482 vs_polarity = 1;
483 hs_polarity = 1;
484 } else {
485 vs_polarity = 1;
486 hs_polarity = 0;
487 }
488
489 val = (vs_polarity << 12) | (hs_polarity << 11);
490
491 /* NOTE: We may not have enough memory to do double buffering while
492 doing compression (amount of memory differs per model cam).
493 So we use the second image buffer also as jpeg stream buffer
494 (see w9968cf_init), and disable double buffering. */
495 if (w9968cf_vga_mode[sd->gspca_dev.curr_mode].pixelformat ==
496 V4L2_PIX_FMT_JPEG) {
497 /* val |= 0x0002; YUV422P */
498 val |= 0x0003; /* YUV420P */
499 } else
500 val |= 0x0080; /* Enable HW double buffering */
501
502 /* val |= 0x0020; enable clamping */
503 /* val |= 0x0008; enable (1-2-1) filter */
504 /* val |= 0x000c; enable (2-3-6-3-2) filter */
505
506 val |= 0x8000; /* capt. enable */
507
508 reg_w(sd, 0x16, val);
509
510 sd->gspca_dev.empty_packet = 0;
511 }
512
513 static void w9968cf_stop0(struct sd *sd)
514 {
515 reg_w(sd, 0x39, 0x0000); /* disable JPEG encoder */
516 reg_w(sd, 0x16, 0x0000); /* stop video capture */
517 }
518
519 /* The w9968cf docs say that a 0 sized packet means EOF (and also SOF
520 for the next frame). This seems to simply not be true when operating
521 in JPEG mode, in this case there may be empty packets within the
522 frame. So in JPEG mode use the JPEG SOI marker to detect SOF.
523
524 Note to make things even more interesting the w9968cf sends *PLANAR* jpeg,
525 to be precise it sends: SOI, SOF, DRI, SOS, Y-data, SOS, U-data, SOS,
526 V-data, EOI. */
527 static void w9968cf_pkt_scan(struct gspca_dev *gspca_dev,
528 u8 *data, /* isoc packet */
529 int len) /* iso packet length */
530 {
531 struct sd *sd = (struct sd *) gspca_dev;
532
533 if (w9968cf_vga_mode[gspca_dev->curr_mode].pixelformat ==
534 V4L2_PIX_FMT_JPEG) {
535 if (len >= 2 &&
536 data[0] == 0xff &&
537 data[1] == 0xd8) {
538 gspca_frame_add(gspca_dev, LAST_PACKET,
539 NULL, 0);
540 gspca_frame_add(gspca_dev, FIRST_PACKET,
541 sd->jpeg_hdr, JPEG_HDR_SZ);
542 /* Strip the ff d8, our own header (which adds
543 huffman and quantization tables) already has this */
544 len -= 2;
545 data += 2;
546 }
547 } else {
548 /* In UYVY mode an empty packet signals EOF */
549 if (gspca_dev->empty_packet) {
550 gspca_frame_add(gspca_dev, LAST_PACKET,
551 NULL, 0);
552 gspca_frame_add(gspca_dev, FIRST_PACKET,
553 NULL, 0);
554 gspca_dev->empty_packet = 0;
555 }
556 }
557 gspca_frame_add(gspca_dev, INTER_PACKET, data, len);
558 }