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sched: Remove double_rq_lock() from __migrate_task()
[linux/fpc-iii.git] / drivers / media / usb / gspca / w996Xcf.c
blobfb9fe2ef3a6f60059b7f3fee4e89254b4869d52f
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 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0,
83 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
84 value, 0x06, sd->gspca_dev.usb_buf, 6, 500);
85 if (ret < 0) {
86 pr_err("Write FSB registers failed (%d)\n", ret);
87 sd->gspca_dev.usb_err = ret;
88 }
89 }
90
91 /*--------------------------------------------------------------------------
92 Write data to the serial bus control register.
93 Return 0 on success, a negative number otherwise.
94 --------------------------------------------------------------------------*/
95 static void w9968cf_write_sb(struct sd *sd, u16 value)
96 {
97 int ret;
98
99 if (sd->gspca_dev.usb_err < 0)
100 return;
101
102 /* We don't use reg_w here, as that would cause all writes when
103 bitbanging i2c to be logged, making the logs impossible to read */
104 ret = usb_control_msg(sd->gspca_dev.dev,
105 usb_sndctrlpipe(sd->gspca_dev.dev, 0),
106 0,
107 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
108 value, 0x01, NULL, 0, 500);
109
110 udelay(W9968CF_I2C_BUS_DELAY);
111
112 if (ret < 0) {
113 pr_err("Write SB reg [01] %04x failed\n", value);
114 sd->gspca_dev.usb_err = ret;
115 }
116 }
117
118 /*--------------------------------------------------------------------------
119 Read data from the serial bus control register.
120 Return 0 on success, a negative number otherwise.
121 --------------------------------------------------------------------------*/
122 static int w9968cf_read_sb(struct sd *sd)
123 {
124 int ret;
125
126 if (sd->gspca_dev.usb_err < 0)
127 return -1;
128
129 /* We don't use reg_r here, as the w9968cf is special and has 16
130 bit registers instead of 8 bit */
131 ret = usb_control_msg(sd->gspca_dev.dev,
132 usb_rcvctrlpipe(sd->gspca_dev.dev, 0),
133 1,
134 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
135 0, 0x01, sd->gspca_dev.usb_buf, 2, 500);
136 if (ret >= 0) {
137 ret = sd->gspca_dev.usb_buf[0] |
138 (sd->gspca_dev.usb_buf[1] << 8);
139 } else {
140 pr_err("Read SB reg [01] failed\n");
141 sd->gspca_dev.usb_err = ret;
142 }
143
144 udelay(W9968CF_I2C_BUS_DELAY);
145
146 return ret;
147 }
148
149 /*--------------------------------------------------------------------------
150 Upload quantization tables for the JPEG compression.
151 This function is called by w9968cf_start_transfer().
152 Return 0 on success, a negative number otherwise.
153 --------------------------------------------------------------------------*/
154 static void w9968cf_upload_quantizationtables(struct sd *sd)
155 {
156 u16 a, b;
157 int i, j;
158
159 reg_w(sd, 0x39, 0x0010); /* JPEG clock enable */
160
161 for (i = 0, j = 0; i < 32; i++, j += 2) {
162 a = Y_QUANTABLE[j] | ((unsigned)(Y_QUANTABLE[j + 1]) << 8);
163 b = UV_QUANTABLE[j] | ((unsigned)(UV_QUANTABLE[j + 1]) << 8);
164 reg_w(sd, 0x40 + i, a);
165 reg_w(sd, 0x60 + i, b);
166 }
167 reg_w(sd, 0x39, 0x0012); /* JPEG encoder enable */
168 }
169
170 /****************************************************************************
171 * Low-level I2C I/O functions. *
172 * The adapter supports the following I2C transfer functions: *
173 * i2c_adap_fastwrite_byte_data() (at 400 kHz bit frequency only) *
174 * i2c_adap_read_byte_data() *
175 * i2c_adap_read_byte() *
176 ****************************************************************************/
177
178 static void w9968cf_smbus_start(struct sd *sd)
179 {
180 w9968cf_write_sb(sd, 0x0011); /* SDE=1, SDA=0, SCL=1 */
181 w9968cf_write_sb(sd, 0x0010); /* SDE=1, SDA=0, SCL=0 */
182 }
183
184 static void w9968cf_smbus_stop(struct sd *sd)
185 {
186 w9968cf_write_sb(sd, 0x0010); /* SDE=1, SDA=0, SCL=0 */
187 w9968cf_write_sb(sd, 0x0011); /* SDE=1, SDA=0, SCL=1 */
188 w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */
189 }
190
191 static void w9968cf_smbus_write_byte(struct sd *sd, u8 v)
192 {
193 u8 bit;
194 int sda;
195
196 for (bit = 0 ; bit < 8 ; bit++) {
197 sda = (v & 0x80) ? 2 : 0;
198 v <<= 1;
199 /* SDE=1, SDA=sda, SCL=0 */
200 w9968cf_write_sb(sd, 0x10 | sda);
201 /* SDE=1, SDA=sda, SCL=1 */
202 w9968cf_write_sb(sd, 0x11 | sda);
203 /* SDE=1, SDA=sda, SCL=0 */
204 w9968cf_write_sb(sd, 0x10 | sda);
205 }
206 }
207
208 static void w9968cf_smbus_read_byte(struct sd *sd, u8 *v)
209 {
210 u8 bit;
211
212 /* No need to ensure SDA is high as we are always called after
213 read_ack which ends with SDA high */
214 *v = 0;
215 for (bit = 0 ; bit < 8 ; bit++) {
216 *v <<= 1;
217 /* SDE=1, SDA=1, SCL=1 */
218 w9968cf_write_sb(sd, 0x0013);
219 *v |= (w9968cf_read_sb(sd) & 0x0008) ? 1 : 0;
220 /* SDE=1, SDA=1, SCL=0 */
221 w9968cf_write_sb(sd, 0x0012);
222 }
223 }
224
225 static void w9968cf_smbus_write_nack(struct sd *sd)
226 {
227 /* No need to ensure SDA is high as we are always called after
228 read_byte which ends with SDA high */
229 w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */
230 w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */
231 }
232
233 static void w9968cf_smbus_read_ack(struct sd *sd)
234 {
235 struct gspca_dev *gspca_dev = (struct gspca_dev *)sd;
236 int sda;
237
238 /* Ensure SDA is high before raising clock to avoid a spurious stop */
239 w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */
240 w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */
241 sda = w9968cf_read_sb(sd);
242 w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */
243 if (sda >= 0 && (sda & 0x08)) {
244 PDEBUG(D_USBI, "Did not receive i2c ACK");
245 sd->gspca_dev.usb_err = -EIO;
246 }
247 }
248
249 /* SMBus protocol: S Addr Wr [A] Subaddr [A] Value [A] P */
250 static void w9968cf_i2c_w(struct sd *sd, u8 reg, u8 value)
251 {
252 struct gspca_dev *gspca_dev = (struct gspca_dev *)sd;
253 u16* data = (u16 *)sd->gspca_dev.usb_buf;
254
255 data[0] = 0x082f | ((sd->sensor_addr & 0x80) ? 0x1500 : 0x0);
256 data[0] |= (sd->sensor_addr & 0x40) ? 0x4000 : 0x0;
257 data[1] = 0x2082 | ((sd->sensor_addr & 0x40) ? 0x0005 : 0x0);
258 data[1] |= (sd->sensor_addr & 0x20) ? 0x0150 : 0x0;
259 data[1] |= (sd->sensor_addr & 0x10) ? 0x5400 : 0x0;
260 data[2] = 0x8208 | ((sd->sensor_addr & 0x08) ? 0x0015 : 0x0);
261 data[2] |= (sd->sensor_addr & 0x04) ? 0x0540 : 0x0;
262 data[2] |= (sd->sensor_addr & 0x02) ? 0x5000 : 0x0;
263 data[3] = 0x1d20 | ((sd->sensor_addr & 0x02) ? 0x0001 : 0x0);
264 data[3] |= (sd->sensor_addr & 0x01) ? 0x0054 : 0x0;
265
266 w9968cf_write_fsb(sd, data);
267
268 data[0] = 0x8208 | ((reg & 0x80) ? 0x0015 : 0x0);
269 data[0] |= (reg & 0x40) ? 0x0540 : 0x0;
270 data[0] |= (reg & 0x20) ? 0x5000 : 0x0;
271 data[1] = 0x0820 | ((reg & 0x20) ? 0x0001 : 0x0);
272 data[1] |= (reg & 0x10) ? 0x0054 : 0x0;
273 data[1] |= (reg & 0x08) ? 0x1500 : 0x0;
274 data[1] |= (reg & 0x04) ? 0x4000 : 0x0;
275 data[2] = 0x2082 | ((reg & 0x04) ? 0x0005 : 0x0);
276 data[2] |= (reg & 0x02) ? 0x0150 : 0x0;
277 data[2] |= (reg & 0x01) ? 0x5400 : 0x0;
278 data[3] = 0x001d;
279
280 w9968cf_write_fsb(sd, data);
281
282 data[0] = 0x8208 | ((value & 0x80) ? 0x0015 : 0x0);
283 data[0] |= (value & 0x40) ? 0x0540 : 0x0;
284 data[0] |= (value & 0x20) ? 0x5000 : 0x0;
285 data[1] = 0x0820 | ((value & 0x20) ? 0x0001 : 0x0);
286 data[1] |= (value & 0x10) ? 0x0054 : 0x0;
287 data[1] |= (value & 0x08) ? 0x1500 : 0x0;
288 data[1] |= (value & 0x04) ? 0x4000 : 0x0;
289 data[2] = 0x2082 | ((value & 0x04) ? 0x0005 : 0x0);
290 data[2] |= (value & 0x02) ? 0x0150 : 0x0;
291 data[2] |= (value & 0x01) ? 0x5400 : 0x0;
292 data[3] = 0xfe1d;
293
294 w9968cf_write_fsb(sd, data);
295
296 PDEBUG(D_USBO, "i2c 0x%02x -> [0x%02x]", value, reg);
297 }
298
299 /* SMBus protocol: S Addr Wr [A] Subaddr [A] P S Addr+1 Rd [A] [Value] NA P */
300 static int w9968cf_i2c_r(struct sd *sd, u8 reg)
301 {
302 struct gspca_dev *gspca_dev = (struct gspca_dev *)sd;
303 int ret = 0;
304 u8 value;
305
306 /* Fast serial bus data control disable */
307 w9968cf_write_sb(sd, 0x0013); /* don't change ! */
308
309 w9968cf_smbus_start(sd);
310 w9968cf_smbus_write_byte(sd, sd->sensor_addr);
311 w9968cf_smbus_read_ack(sd);
312 w9968cf_smbus_write_byte(sd, reg);
313 w9968cf_smbus_read_ack(sd);
314 w9968cf_smbus_stop(sd);
315 w9968cf_smbus_start(sd);
316 w9968cf_smbus_write_byte(sd, sd->sensor_addr + 1);
317 w9968cf_smbus_read_ack(sd);
318 w9968cf_smbus_read_byte(sd, &value);
319 /* signal we don't want to read anymore, the v4l1 driver used to
320 send an ack here which is very wrong! (and then fixed
321 the issues this gave by retrying reads) */
322 w9968cf_smbus_write_nack(sd);
323 w9968cf_smbus_stop(sd);
324
325 /* Fast serial bus data control re-enable */
326 w9968cf_write_sb(sd, 0x0030);
327
328 if (sd->gspca_dev.usb_err >= 0) {
329 ret = value;
330 PDEBUG(D_USBI, "i2c [0x%02X] -> 0x%02X", reg, value);
331 } else
332 PERR("i2c read [0x%02x] failed", reg);
333
334 return ret;
335 }
336
337 /*--------------------------------------------------------------------------
338 Turn on the LED on some webcams. A beep should be heard too.
339 Return 0 on success, a negative number otherwise.
340 --------------------------------------------------------------------------*/
341 static void w9968cf_configure(struct sd *sd)
342 {
343 reg_w(sd, 0x00, 0xff00); /* power-down */
344 reg_w(sd, 0x00, 0xbf17); /* reset everything */
345 reg_w(sd, 0x00, 0xbf10); /* normal operation */
346 reg_w(sd, 0x01, 0x0010); /* serial bus, SDS high */
347 reg_w(sd, 0x01, 0x0000); /* serial bus, SDS low */
348 reg_w(sd, 0x01, 0x0010); /* ..high 'beep-beep' */
349 reg_w(sd, 0x01, 0x0030); /* Set sda scl to FSB mode */
350
351 sd->stopped = 1;
352 }
353
354 static void w9968cf_init(struct sd *sd)
355 {
356 unsigned long hw_bufsize = sd->sif ? (352 * 288 * 2) : (640 * 480 * 2),
357 y0 = 0x0000,
358 u0 = y0 + hw_bufsize / 2,
359 v0 = u0 + hw_bufsize / 4,
360 y1 = v0 + hw_bufsize / 4,
361 u1 = y1 + hw_bufsize / 2,
362 v1 = u1 + hw_bufsize / 4;
363
364 reg_w(sd, 0x00, 0xff00); /* power off */
365 reg_w(sd, 0x00, 0xbf10); /* power on */
366
367 reg_w(sd, 0x03, 0x405d); /* DRAM timings */
368 reg_w(sd, 0x04, 0x0030); /* SDRAM timings */
369
370 reg_w(sd, 0x20, y0 & 0xffff); /* Y buf.0, low */
371 reg_w(sd, 0x21, y0 >> 16); /* Y buf.0, high */
372 reg_w(sd, 0x24, u0 & 0xffff); /* U buf.0, low */
373 reg_w(sd, 0x25, u0 >> 16); /* U buf.0, high */
374 reg_w(sd, 0x28, v0 & 0xffff); /* V buf.0, low */
375 reg_w(sd, 0x29, v0 >> 16); /* V buf.0, high */
376
377 reg_w(sd, 0x22, y1 & 0xffff); /* Y buf.1, low */
378 reg_w(sd, 0x23, y1 >> 16); /* Y buf.1, high */
379 reg_w(sd, 0x26, u1 & 0xffff); /* U buf.1, low */
380 reg_w(sd, 0x27, u1 >> 16); /* U buf.1, high */
381 reg_w(sd, 0x2a, v1 & 0xffff); /* V buf.1, low */
382 reg_w(sd, 0x2b, v1 >> 16); /* V buf.1, high */
383
384 reg_w(sd, 0x32, y1 & 0xffff); /* JPEG buf 0 low */
385 reg_w(sd, 0x33, y1 >> 16); /* JPEG buf 0 high */
386
387 reg_w(sd, 0x34, y1 & 0xffff); /* JPEG buf 1 low */
388 reg_w(sd, 0x35, y1 >> 16); /* JPEG bug 1 high */
389
390 reg_w(sd, 0x36, 0x0000);/* JPEG restart interval */
391 reg_w(sd, 0x37, 0x0804);/*JPEG VLE FIFO threshold*/
392 reg_w(sd, 0x38, 0x0000);/* disable hw up-scaling */
393 reg_w(sd, 0x3f, 0x0000); /* JPEG/MCTL test data */
394 }
395
396 static void w9968cf_set_crop_window(struct sd *sd)
397 {
398 int start_cropx, start_cropy, x, y, fw, fh, cw, ch,
399 max_width, max_height;
400
401 if (sd->sif) {
402 max_width = 352;
403 max_height = 288;
404 } else {
405 max_width = 640;
406 max_height = 480;
407 }
408
409 if (sd->sensor == SEN_OV7620) {
410 /*
411 * Sigh, this is dependend on the clock / framerate changes
412 * made by the frequency control, sick.
413 *
414 * Note we cannot use v4l2_ctrl_g_ctrl here, as we get called
415 * from ov519.c:setfreq() with the ctrl lock held!
416 */
417 if (sd->freq->val == 1) {
418 start_cropx = 277;
419 start_cropy = 37;
420 } else {
421 start_cropx = 105;
422 start_cropy = 37;
423 }
424 } else {
425 start_cropx = 320;
426 start_cropy = 35;
427 }
428
429 /* Work around to avoid FP arithmetics */
430 #define SC(x) ((x) << 10)
431
432 /* Scaling factors */
433 fw = SC(sd->gspca_dev.pixfmt.width) / max_width;
434 fh = SC(sd->gspca_dev.pixfmt.height) / max_height;
435
436 cw = (fw >= fh) ? max_width : SC(sd->gspca_dev.pixfmt.width) / fh;
437 ch = (fw >= fh) ? SC(sd->gspca_dev.pixfmt.height) / fw : max_height;
438
439 sd->sensor_width = max_width;
440 sd->sensor_height = max_height;
441
442 x = (max_width - cw) / 2;
443 y = (max_height - ch) / 2;
444
445 reg_w(sd, 0x10, start_cropx + x);
446 reg_w(sd, 0x11, start_cropy + y);
447 reg_w(sd, 0x12, start_cropx + x + cw);
448 reg_w(sd, 0x13, start_cropy + y + ch);
449 }
450
451 static void w9968cf_mode_init_regs(struct sd *sd)
452 {
453 int val, vs_polarity, hs_polarity;
454
455 w9968cf_set_crop_window(sd);
456
457 reg_w(sd, 0x14, sd->gspca_dev.pixfmt.width);
458 reg_w(sd, 0x15, sd->gspca_dev.pixfmt.height);
459
460 /* JPEG width & height */
461 reg_w(sd, 0x30, sd->gspca_dev.pixfmt.width);
462 reg_w(sd, 0x31, sd->gspca_dev.pixfmt.height);
463
464 /* Y & UV frame buffer strides (in WORD) */
465 if (w9968cf_vga_mode[sd->gspca_dev.curr_mode].pixelformat ==
466 V4L2_PIX_FMT_JPEG) {
467 reg_w(sd, 0x2c, sd->gspca_dev.pixfmt.width / 2);
468 reg_w(sd, 0x2d, sd->gspca_dev.pixfmt.width / 4);
469 } else
470 reg_w(sd, 0x2c, sd->gspca_dev.pixfmt.width);
471
472 reg_w(sd, 0x00, 0xbf17); /* reset everything */
473 reg_w(sd, 0x00, 0xbf10); /* normal operation */
474
475 /* Transfer size in WORDS (for UYVY format only) */
476 val = sd->gspca_dev.pixfmt.width * sd->gspca_dev.pixfmt.height;
477 reg_w(sd, 0x3d, val & 0xffff); /* low bits */
478 reg_w(sd, 0x3e, val >> 16); /* high bits */
479
480 if (w9968cf_vga_mode[sd->gspca_dev.curr_mode].pixelformat ==
481 V4L2_PIX_FMT_JPEG) {
482 /* We may get called multiple times (usb isoc bw negotiat.) */
483 jpeg_define(sd->jpeg_hdr, sd->gspca_dev.pixfmt.height,
484 sd->gspca_dev.pixfmt.width, 0x22); /* JPEG 420 */
485 jpeg_set_qual(sd->jpeg_hdr, v4l2_ctrl_g_ctrl(sd->jpegqual));
486 w9968cf_upload_quantizationtables(sd);
487 v4l2_ctrl_grab(sd->jpegqual, true);
488 }
489
490 /* Video Capture Control Register */
491 if (sd->sensor == SEN_OV7620) {
492 /* Seems to work around a bug in the image sensor */
493 vs_polarity = 1;
494 hs_polarity = 1;
495 } else {
496 vs_polarity = 1;
497 hs_polarity = 0;
498 }
499
500 val = (vs_polarity << 12) | (hs_polarity << 11);
501
502 /* NOTE: We may not have enough memory to do double buffering while
503 doing compression (amount of memory differs per model cam).
504 So we use the second image buffer also as jpeg stream buffer
505 (see w9968cf_init), and disable double buffering. */
506 if (w9968cf_vga_mode[sd->gspca_dev.curr_mode].pixelformat ==
507 V4L2_PIX_FMT_JPEG) {
508 /* val |= 0x0002; YUV422P */
509 val |= 0x0003; /* YUV420P */
510 } else
511 val |= 0x0080; /* Enable HW double buffering */
512
513 /* val |= 0x0020; enable clamping */
514 /* val |= 0x0008; enable (1-2-1) filter */
515 /* val |= 0x000c; enable (2-3-6-3-2) filter */
516
517 val |= 0x8000; /* capt. enable */
518
519 reg_w(sd, 0x16, val);
520
521 sd->gspca_dev.empty_packet = 0;
522 }
523
524 static void w9968cf_stop0(struct sd *sd)
525 {
526 v4l2_ctrl_grab(sd->jpegqual, false);
527 reg_w(sd, 0x39, 0x0000); /* disable JPEG encoder */
528 reg_w(sd, 0x16, 0x0000); /* stop video capture */
529 }
530
531 /* The w9968cf docs say that a 0 sized packet means EOF (and also SOF
532 for the next frame). This seems to simply not be true when operating
533 in JPEG mode, in this case there may be empty packets within the
534 frame. So in JPEG mode use the JPEG SOI marker to detect SOF.
535
536 Note to make things even more interesting the w9968cf sends *PLANAR* jpeg,
537 to be precise it sends: SOI, SOF, DRI, SOS, Y-data, SOS, U-data, SOS,
538 V-data, EOI. */
539 static void w9968cf_pkt_scan(struct gspca_dev *gspca_dev,
540 u8 *data, /* isoc packet */
541 int len) /* iso packet length */
542 {
543 struct sd *sd = (struct sd *) gspca_dev;
544
545 if (w9968cf_vga_mode[gspca_dev->curr_mode].pixelformat ==
546 V4L2_PIX_FMT_JPEG) {
547 if (len >= 2 &&
548 data[0] == 0xff &&
549 data[1] == 0xd8) {
550 gspca_frame_add(gspca_dev, LAST_PACKET,
551 NULL, 0);
552 gspca_frame_add(gspca_dev, FIRST_PACKET,
553 sd->jpeg_hdr, JPEG_HDR_SZ);
554 /* Strip the ff d8, our own header (which adds
555 huffman and quantization tables) already has this */
556 len -= 2;
557 data += 2;
558 }
559 } else {
560 /* In UYVY mode an empty packet signals EOF */
561 if (gspca_dev->empty_packet) {
562 gspca_frame_add(gspca_dev, LAST_PACKET,
563 NULL, 0);
564 gspca_frame_add(gspca_dev, FIRST_PACKET,
565 NULL, 0);
566 gspca_dev->empty_packet = 0;
567 }
568 }
569 gspca_frame_add(gspca_dev, INTER_PACKET, data, len);
570 }
Linux with added FPC-III support