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 */
22
23 /* Note this is not a stand alone driver, it gets included in ov519.c, this
24 is a bit of a hack, but it needs the driver code for a lot of different
25 ov sensors which is already present in ov519.c (the old v4l1 driver used
26 the ovchipcam framework). When we have the time we really should move
27 the sensor drivers to v4l2 sub drivers, and properly split of this
28 driver from ov519.c */
29
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31
32 #define W9968CF_I2C_BUS_DELAY 4 /* delay in us for I2C bit r/w operations */
33
34 #define Y_QUANTABLE (&sd->jpeg_hdr[JPEG_QT0_OFFSET])
35 #define UV_QUANTABLE (&sd->jpeg_hdr[JPEG_QT1_OFFSET])
36
37 static const struct v4l2_pix_format w9968cf_vga_mode[] = {
38 {160, 120, V4L2_PIX_FMT_UYVY, V4L2_FIELD_NONE,
39 .bytesperline = 160 * 2,
40 .sizeimage = 160 * 120 * 2,
41 .colorspace = V4L2_COLORSPACE_JPEG},
42 {176, 144, V4L2_PIX_FMT_UYVY, V4L2_FIELD_NONE,
43 .bytesperline = 176 * 2,
44 .sizeimage = 176 * 144 * 2,
45 .colorspace = V4L2_COLORSPACE_JPEG},
46 {320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
47 .bytesperline = 320 * 2,
48 .sizeimage = 320 * 240 * 2,
49 .colorspace = V4L2_COLORSPACE_JPEG},
50 {352, 288, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
51 .bytesperline = 352 * 2,
52 .sizeimage = 352 * 288 * 2,
53 .colorspace = V4L2_COLORSPACE_JPEG},
54 {640, 480, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
55 .bytesperline = 640 * 2,
56 .sizeimage = 640 * 480 * 2,
57 .colorspace = V4L2_COLORSPACE_JPEG},
58 };
59
60 static void reg_w(struct sd *sd, u16 index, u16 value);
61
62 /*--------------------------------------------------------------------------
63 Write 64-bit data to the fast serial bus registers.
64 Return 0 on success, -1 otherwise.
65 --------------------------------------------------------------------------*/
w9968cf_write_fsb(struct sd * sd,u16 * data)66 static void w9968cf_write_fsb(struct sd *sd, u16* data)
67 {
68 struct usb_device *udev = sd->gspca_dev.dev;
69 u16 value;
70 int ret;
71
72 if (sd->gspca_dev.usb_err < 0)
73 return;
74
75 value = *data++;
76 memcpy(sd->gspca_dev.usb_buf, data, 6);
77
78 /* Avoid things going to fast for the bridge with a xhci host */
79 udelay(150);
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 pr_err("Write FSB registers failed (%d)\n", 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 --------------------------------------------------------------------------*/
w9968cf_write_sb(struct sd * sd,u16 value)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 /* Avoid things going to fast for the bridge with a xhci host */
101 udelay(150);
102
103 /* We don't use reg_w here, as that would cause all writes when
104 bitbanging i2c to be logged, making the logs impossible to read */
105 ret = usb_control_msg(sd->gspca_dev.dev,
106 usb_sndctrlpipe(sd->gspca_dev.dev, 0),
107 0,
108 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
109 value, 0x01, NULL, 0, 500);
110
111 udelay(W9968CF_I2C_BUS_DELAY);
112
113 if (ret < 0) {
114 pr_err("Write SB reg [01] %04x failed\n", value);
115 sd->gspca_dev.usb_err = ret;
116 }
117 }
118
119 /*--------------------------------------------------------------------------
120 Read data from the serial bus control register.
121 Return 0 on success, a negative number otherwise.
122 --------------------------------------------------------------------------*/
w9968cf_read_sb(struct sd * sd)123 static int w9968cf_read_sb(struct sd *sd)
124 {
125 int ret;
126
127 if (sd->gspca_dev.usb_err < 0)
128 return -1;
129
130 /* Avoid things going to fast for the bridge with a xhci host */
131 udelay(150);
132
133 /* We don't use reg_r here, as the w9968cf is special and has 16
134 bit registers instead of 8 bit */
135 ret = usb_control_msg(sd->gspca_dev.dev,
136 usb_rcvctrlpipe(sd->gspca_dev.dev, 0),
137 1,
138 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
139 0, 0x01, sd->gspca_dev.usb_buf, 2, 500);
140 if (ret >= 0) {
141 ret = sd->gspca_dev.usb_buf[0] |
142 (sd->gspca_dev.usb_buf[1] << 8);
143 } else {
144 pr_err("Read SB reg [01] failed\n");
145 sd->gspca_dev.usb_err = ret;
146 /*
147 * Make sure the buffer is zeroed to avoid uninitialized
148 * values.
149 */
150 memset(sd->gspca_dev.usb_buf, 0, 2);
151 }
152
153 udelay(W9968CF_I2C_BUS_DELAY);
154
155 return ret;
156 }
157
158 /*--------------------------------------------------------------------------
159 Upload quantization tables for the JPEG compression.
160 This function is called by w9968cf_start_transfer().
161 Return 0 on success, a negative number otherwise.
162 --------------------------------------------------------------------------*/
w9968cf_upload_quantizationtables(struct sd * sd)163 static void w9968cf_upload_quantizationtables(struct sd *sd)
164 {
165 u16 a, b;
166 int i, j;
167
168 reg_w(sd, 0x39, 0x0010); /* JPEG clock enable */
169
170 for (i = 0, j = 0; i < 32; i++, j += 2) {
171 a = Y_QUANTABLE[j] | ((unsigned)(Y_QUANTABLE[j + 1]) << 8);
172 b = UV_QUANTABLE[j] | ((unsigned)(UV_QUANTABLE[j + 1]) << 8);
173 reg_w(sd, 0x40 + i, a);
174 reg_w(sd, 0x60 + i, b);
175 }
176 reg_w(sd, 0x39, 0x0012); /* JPEG encoder enable */
177 }
178
179 /****************************************************************************
180 * Low-level I2C I/O functions. *
181 * The adapter supports the following I2C transfer functions: *
182 * i2c_adap_fastwrite_byte_data() (at 400 kHz bit frequency only) *
183 * i2c_adap_read_byte_data() *
184 * i2c_adap_read_byte() *
185 ****************************************************************************/
186
w9968cf_smbus_start(struct sd * sd)187 static void w9968cf_smbus_start(struct sd *sd)
188 {
189 w9968cf_write_sb(sd, 0x0011); /* SDE=1, SDA=0, SCL=1 */
190 w9968cf_write_sb(sd, 0x0010); /* SDE=1, SDA=0, SCL=0 */
191 }
192
w9968cf_smbus_stop(struct sd * sd)193 static void w9968cf_smbus_stop(struct sd *sd)
194 {
195 w9968cf_write_sb(sd, 0x0010); /* SDE=1, SDA=0, SCL=0 */
196 w9968cf_write_sb(sd, 0x0011); /* SDE=1, SDA=0, SCL=1 */
197 w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */
198 }
199
w9968cf_smbus_write_byte(struct sd * sd,u8 v)200 static void w9968cf_smbus_write_byte(struct sd *sd, u8 v)
201 {
202 u8 bit;
203 int sda;
204
205 for (bit = 0 ; bit < 8 ; bit++) {
206 sda = (v & 0x80) ? 2 : 0;
207 v <<= 1;
208 /* SDE=1, SDA=sda, SCL=0 */
209 w9968cf_write_sb(sd, 0x10 | sda);
210 /* SDE=1, SDA=sda, SCL=1 */
211 w9968cf_write_sb(sd, 0x11 | sda);
212 /* SDE=1, SDA=sda, SCL=0 */
213 w9968cf_write_sb(sd, 0x10 | sda);
214 }
215 }
216
w9968cf_smbus_read_byte(struct sd * sd,u8 * v)217 static void w9968cf_smbus_read_byte(struct sd *sd, u8 *v)
218 {
219 u8 bit;
220
221 /* No need to ensure SDA is high as we are always called after
222 read_ack which ends with SDA high */
223 *v = 0;
224 for (bit = 0 ; bit < 8 ; bit++) {
225 *v <<= 1;
226 /* SDE=1, SDA=1, SCL=1 */
227 w9968cf_write_sb(sd, 0x0013);
228 *v |= (w9968cf_read_sb(sd) & 0x0008) ? 1 : 0;
229 /* SDE=1, SDA=1, SCL=0 */
230 w9968cf_write_sb(sd, 0x0012);
231 }
232 }
233
w9968cf_smbus_write_nack(struct sd * sd)234 static void w9968cf_smbus_write_nack(struct sd *sd)
235 {
236 /* No need to ensure SDA is high as we are always called after
237 read_byte which ends with SDA high */
238 w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */
239 w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */
240 }
241
w9968cf_smbus_read_ack(struct sd * sd)242 static void w9968cf_smbus_read_ack(struct sd *sd)
243 {
244 struct gspca_dev *gspca_dev = (struct gspca_dev *)sd;
245 int sda;
246
247 /* Ensure SDA is high before raising clock to avoid a spurious stop */
248 w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */
249 w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */
250 sda = w9968cf_read_sb(sd);
251 w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */
252 if (sda >= 0 && (sda & 0x08)) {
253 gspca_dbg(gspca_dev, D_USBI, "Did not receive i2c ACK\n");
254 sd->gspca_dev.usb_err = -EIO;
255 }
256 }
257
258 /* SMBus protocol: S Addr Wr [A] Subaddr [A] Value [A] P */
w9968cf_i2c_w(struct sd * sd,u8 reg,u8 value)259 static void w9968cf_i2c_w(struct sd *sd, u8 reg, u8 value)
260 {
261 struct gspca_dev *gspca_dev = (struct gspca_dev *)sd;
262 u16* data = (u16 *)sd->gspca_dev.usb_buf;
263
264 data[0] = 0x082f | ((sd->sensor_addr & 0x80) ? 0x1500 : 0x0);
265 data[0] |= (sd->sensor_addr & 0x40) ? 0x4000 : 0x0;
266 data[1] = 0x2082 | ((sd->sensor_addr & 0x40) ? 0x0005 : 0x0);
267 data[1] |= (sd->sensor_addr & 0x20) ? 0x0150 : 0x0;
268 data[1] |= (sd->sensor_addr & 0x10) ? 0x5400 : 0x0;
269 data[2] = 0x8208 | ((sd->sensor_addr & 0x08) ? 0x0015 : 0x0);
270 data[2] |= (sd->sensor_addr & 0x04) ? 0x0540 : 0x0;
271 data[2] |= (sd->sensor_addr & 0x02) ? 0x5000 : 0x0;
272 data[3] = 0x1d20 | ((sd->sensor_addr & 0x02) ? 0x0001 : 0x0);
273 data[3] |= (sd->sensor_addr & 0x01) ? 0x0054 : 0x0;
274
275 w9968cf_write_fsb(sd, data);
276
277 data[0] = 0x8208 | ((reg & 0x80) ? 0x0015 : 0x0);
278 data[0] |= (reg & 0x40) ? 0x0540 : 0x0;
279 data[0] |= (reg & 0x20) ? 0x5000 : 0x0;
280 data[1] = 0x0820 | ((reg & 0x20) ? 0x0001 : 0x0);
281 data[1] |= (reg & 0x10) ? 0x0054 : 0x0;
282 data[1] |= (reg & 0x08) ? 0x1500 : 0x0;
283 data[1] |= (reg & 0x04) ? 0x4000 : 0x0;
284 data[2] = 0x2082 | ((reg & 0x04) ? 0x0005 : 0x0);
285 data[2] |= (reg & 0x02) ? 0x0150 : 0x0;
286 data[2] |= (reg & 0x01) ? 0x5400 : 0x0;
287 data[3] = 0x001d;
288
289 w9968cf_write_fsb(sd, data);
290
291 data[0] = 0x8208 | ((value & 0x80) ? 0x0015 : 0x0);
292 data[0] |= (value & 0x40) ? 0x0540 : 0x0;
293 data[0] |= (value & 0x20) ? 0x5000 : 0x0;
294 data[1] = 0x0820 | ((value & 0x20) ? 0x0001 : 0x0);
295 data[1] |= (value & 0x10) ? 0x0054 : 0x0;
296 data[1] |= (value & 0x08) ? 0x1500 : 0x0;
297 data[1] |= (value & 0x04) ? 0x4000 : 0x0;
298 data[2] = 0x2082 | ((value & 0x04) ? 0x0005 : 0x0);
299 data[2] |= (value & 0x02) ? 0x0150 : 0x0;
300 data[2] |= (value & 0x01) ? 0x5400 : 0x0;
301 data[3] = 0xfe1d;
302
303 w9968cf_write_fsb(sd, data);
304
305 gspca_dbg(gspca_dev, D_USBO, "i2c 0x%02x -> [0x%02x]\n", value, reg);
306 }
307
308 /* SMBus protocol: S Addr Wr [A] Subaddr [A] P S Addr+1 Rd [A] [Value] NA P */
w9968cf_i2c_r(struct sd * sd,u8 reg)309 static int w9968cf_i2c_r(struct sd *sd, u8 reg)
310 {
311 struct gspca_dev *gspca_dev = (struct gspca_dev *)sd;
312 int ret = 0;
313 u8 value;
314
315 /* Fast serial bus data control disable */
316 w9968cf_write_sb(sd, 0x0013); /* don't change ! */
317
318 w9968cf_smbus_start(sd);
319 w9968cf_smbus_write_byte(sd, sd->sensor_addr);
320 w9968cf_smbus_read_ack(sd);
321 w9968cf_smbus_write_byte(sd, reg);
322 w9968cf_smbus_read_ack(sd);
323 w9968cf_smbus_stop(sd);
324 w9968cf_smbus_start(sd);
325 w9968cf_smbus_write_byte(sd, sd->sensor_addr + 1);
326 w9968cf_smbus_read_ack(sd);
327 w9968cf_smbus_read_byte(sd, &value);
328 /* signal we don't want to read anymore, the v4l1 driver used to
329 send an ack here which is very wrong! (and then fixed
330 the issues this gave by retrying reads) */
331 w9968cf_smbus_write_nack(sd);
332 w9968cf_smbus_stop(sd);
333
334 /* Fast serial bus data control re-enable */
335 w9968cf_write_sb(sd, 0x0030);
336
337 if (sd->gspca_dev.usb_err >= 0) {
338 ret = value;
339 gspca_dbg(gspca_dev, D_USBI, "i2c [0x%02X] -> 0x%02X\n",
340 reg, value);
341 } else
342 gspca_err(gspca_dev, "i2c read [0x%02x] failed\n", reg);
343
344 return ret;
345 }
346
347 /*--------------------------------------------------------------------------
348 Turn on the LED on some webcams. A beep should be heard too.
349 Return 0 on success, a negative number otherwise.
350 --------------------------------------------------------------------------*/
w9968cf_configure(struct sd * sd)351 static void w9968cf_configure(struct sd *sd)
352 {
353 reg_w(sd, 0x00, 0xff00); /* power-down */
354 reg_w(sd, 0x00, 0xbf17); /* reset everything */
355 reg_w(sd, 0x00, 0xbf10); /* normal operation */
356 reg_w(sd, 0x01, 0x0010); /* serial bus, SDS high */
357 reg_w(sd, 0x01, 0x0000); /* serial bus, SDS low */
358 reg_w(sd, 0x01, 0x0010); /* ..high 'beep-beep' */
359 reg_w(sd, 0x01, 0x0030); /* Set sda scl to FSB mode */
360
361 sd->stopped = 1;
362 }
363
w9968cf_init(struct sd * sd)364 static void w9968cf_init(struct sd *sd)
365 {
366 unsigned long hw_bufsize = sd->sif ? (352 * 288 * 2) : (640 * 480 * 2),
367 y0 = 0x0000,
368 u0 = y0 + hw_bufsize / 2,
369 v0 = u0 + hw_bufsize / 4,
370 y1 = v0 + hw_bufsize / 4,
371 u1 = y1 + hw_bufsize / 2,
372 v1 = u1 + hw_bufsize / 4;
373
374 reg_w(sd, 0x00, 0xff00); /* power off */
375 reg_w(sd, 0x00, 0xbf10); /* power on */
376
377 reg_w(sd, 0x03, 0x405d); /* DRAM timings */
378 reg_w(sd, 0x04, 0x0030); /* SDRAM timings */
379
380 reg_w(sd, 0x20, y0 & 0xffff); /* Y buf.0, low */
381 reg_w(sd, 0x21, y0 >> 16); /* Y buf.0, high */
382 reg_w(sd, 0x24, u0 & 0xffff); /* U buf.0, low */
383 reg_w(sd, 0x25, u0 >> 16); /* U buf.0, high */
384 reg_w(sd, 0x28, v0 & 0xffff); /* V buf.0, low */
385 reg_w(sd, 0x29, v0 >> 16); /* V buf.0, high */
386
387 reg_w(sd, 0x22, y1 & 0xffff); /* Y buf.1, low */
388 reg_w(sd, 0x23, y1 >> 16); /* Y buf.1, high */
389 reg_w(sd, 0x26, u1 & 0xffff); /* U buf.1, low */
390 reg_w(sd, 0x27, u1 >> 16); /* U buf.1, high */
391 reg_w(sd, 0x2a, v1 & 0xffff); /* V buf.1, low */
392 reg_w(sd, 0x2b, v1 >> 16); /* V buf.1, high */
393
394 reg_w(sd, 0x32, y1 & 0xffff); /* JPEG buf 0 low */
395 reg_w(sd, 0x33, y1 >> 16); /* JPEG buf 0 high */
396
397 reg_w(sd, 0x34, y1 & 0xffff); /* JPEG buf 1 low */
398 reg_w(sd, 0x35, y1 >> 16); /* JPEG bug 1 high */
399
400 reg_w(sd, 0x36, 0x0000);/* JPEG restart interval */
401 reg_w(sd, 0x37, 0x0804);/*JPEG VLE FIFO threshold*/
402 reg_w(sd, 0x38, 0x0000);/* disable hw up-scaling */
403 reg_w(sd, 0x3f, 0x0000); /* JPEG/MCTL test data */
404 }
405
w9968cf_set_crop_window(struct sd * sd)406 static void w9968cf_set_crop_window(struct sd *sd)
407 {
408 int start_cropx, start_cropy, x, y, fw, fh, cw, ch,
409 max_width, max_height;
410
411 if (sd->sif) {
412 max_width = 352;
413 max_height = 288;
414 } else {
415 max_width = 640;
416 max_height = 480;
417 }
418
419 if (sd->sensor == SEN_OV7620) {
420 /*
421 * Sigh, this is dependend on the clock / framerate changes
422 * made by the frequency control, sick.
423 *
424 * Note we cannot use v4l2_ctrl_g_ctrl here, as we get called
425 * from ov519.c:setfreq() with the ctrl lock held!
426 */
427 if (sd->freq->val == 1) {
428 start_cropx = 277;
429 start_cropy = 37;
430 } else {
431 start_cropx = 105;
432 start_cropy = 37;
433 }
434 } else {
435 start_cropx = 320;
436 start_cropy = 35;
437 }
438
439 /* Work around to avoid FP arithmetics */
440 #define SC(x) ((x) << 10)
441
442 /* Scaling factors */
443 fw = SC(sd->gspca_dev.pixfmt.width) / max_width;
444 fh = SC(sd->gspca_dev.pixfmt.height) / max_height;
445
446 cw = (fw >= fh) ? max_width : SC(sd->gspca_dev.pixfmt.width) / fh;
447 ch = (fw >= fh) ? SC(sd->gspca_dev.pixfmt.height) / fw : max_height;
448
449 sd->sensor_width = max_width;
450 sd->sensor_height = max_height;
451
452 x = (max_width - cw) / 2;
453 y = (max_height - ch) / 2;
454
455 reg_w(sd, 0x10, start_cropx + x);
456 reg_w(sd, 0x11, start_cropy + y);
457 reg_w(sd, 0x12, start_cropx + x + cw);
458 reg_w(sd, 0x13, start_cropy + y + ch);
459 }
460
w9968cf_mode_init_regs(struct sd * sd)461 static void w9968cf_mode_init_regs(struct sd *sd)
462 {
463 int val, vs_polarity, hs_polarity;
464
465 w9968cf_set_crop_window(sd);
466
467 reg_w(sd, 0x14, sd->gspca_dev.pixfmt.width);
468 reg_w(sd, 0x15, sd->gspca_dev.pixfmt.height);
469
470 /* JPEG width & height */
471 reg_w(sd, 0x30, sd->gspca_dev.pixfmt.width);
472 reg_w(sd, 0x31, sd->gspca_dev.pixfmt.height);
473
474 /* Y & UV frame buffer strides (in WORD) */
475 if (w9968cf_vga_mode[sd->gspca_dev.curr_mode].pixelformat ==
476 V4L2_PIX_FMT_JPEG) {
477 reg_w(sd, 0x2c, sd->gspca_dev.pixfmt.width / 2);
478 reg_w(sd, 0x2d, sd->gspca_dev.pixfmt.width / 4);
479 } else
480 reg_w(sd, 0x2c, sd->gspca_dev.pixfmt.width);
481
482 reg_w(sd, 0x00, 0xbf17); /* reset everything */
483 reg_w(sd, 0x00, 0xbf10); /* normal operation */
484
485 /* Transfer size in WORDS (for UYVY format only) */
486 val = sd->gspca_dev.pixfmt.width * sd->gspca_dev.pixfmt.height;
487 reg_w(sd, 0x3d, val & 0xffff); /* low bits */
488 reg_w(sd, 0x3e, val >> 16); /* high bits */
489
490 if (w9968cf_vga_mode[sd->gspca_dev.curr_mode].pixelformat ==
491 V4L2_PIX_FMT_JPEG) {
492 /* We may get called multiple times (usb isoc bw negotiat.) */
493 jpeg_define(sd->jpeg_hdr, sd->gspca_dev.pixfmt.height,
494 sd->gspca_dev.pixfmt.width, 0x22); /* JPEG 420 */
495 jpeg_set_qual(sd->jpeg_hdr, v4l2_ctrl_g_ctrl(sd->jpegqual));
496 w9968cf_upload_quantizationtables(sd);
497 v4l2_ctrl_grab(sd->jpegqual, true);
498 }
499
500 /* Video Capture Control Register */
501 if (sd->sensor == SEN_OV7620) {
502 /* Seems to work around a bug in the image sensor */
503 vs_polarity = 1;
504 hs_polarity = 1;
505 } else {
506 vs_polarity = 1;
507 hs_polarity = 0;
508 }
509
510 val = (vs_polarity << 12) | (hs_polarity << 11);
511
512 /* NOTE: We may not have enough memory to do double buffering while
513 doing compression (amount of memory differs per model cam).
514 So we use the second image buffer also as jpeg stream buffer
515 (see w9968cf_init), and disable double buffering. */
516 if (w9968cf_vga_mode[sd->gspca_dev.curr_mode].pixelformat ==
517 V4L2_PIX_FMT_JPEG) {
518 /* val |= 0x0002; YUV422P */
519 val |= 0x0003; /* YUV420P */
520 } else
521 val |= 0x0080; /* Enable HW double buffering */
522
523 /* val |= 0x0020; enable clamping */
524 /* val |= 0x0008; enable (1-2-1) filter */
525 /* val |= 0x000c; enable (2-3-6-3-2) filter */
526
527 val |= 0x8000; /* capt. enable */
528
529 reg_w(sd, 0x16, val);
530
531 sd->gspca_dev.empty_packet = 0;
532 }
533
w9968cf_stop0(struct sd * sd)534 static void w9968cf_stop0(struct sd *sd)
535 {
536 v4l2_ctrl_grab(sd->jpegqual, false);
537 reg_w(sd, 0x39, 0x0000); /* disable JPEG encoder */
538 reg_w(sd, 0x16, 0x0000); /* stop video capture */
539 }
540
541 /* The w9968cf docs say that a 0 sized packet means EOF (and also SOF
542 for the next frame). This seems to simply not be true when operating
543 in JPEG mode, in this case there may be empty packets within the
544 frame. So in JPEG mode use the JPEG SOI marker to detect SOF.
545
546 Note to make things even more interesting the w9968cf sends *PLANAR* jpeg,
547 to be precise it sends: SOI, SOF, DRI, SOS, Y-data, SOS, U-data, SOS,
548 V-data, EOI. */
w9968cf_pkt_scan(struct gspca_dev * gspca_dev,u8 * data,int len)549 static void w9968cf_pkt_scan(struct gspca_dev *gspca_dev,
550 u8 *data, /* isoc packet */
551 int len) /* iso packet length */
552 {
553 struct sd *sd = (struct sd *) gspca_dev;
554
555 if (w9968cf_vga_mode[gspca_dev->curr_mode].pixelformat ==
556 V4L2_PIX_FMT_JPEG) {
557 if (len >= 2 &&
558 data[0] == 0xff &&
559 data[1] == 0xd8) {
560 gspca_frame_add(gspca_dev, LAST_PACKET,
561 NULL, 0);
562 gspca_frame_add(gspca_dev, FIRST_PACKET,
563 sd->jpeg_hdr, JPEG_HDR_SZ);
564 /* Strip the ff d8, our own header (which adds
565 huffman and quantization tables) already has this */
566 len -= 2;
567 data += 2;
568 }
569 } else {
570 /* In UYVY mode an empty packet signals EOF */
571 if (gspca_dev->empty_packet) {
572 gspca_frame_add(gspca_dev, LAST_PACKET,
573 NULL, 0);
574 gspca_frame_add(gspca_dev, FIRST_PACKET,
575 NULL, 0);
576 gspca_dev->empty_packet = 0;
577 }
578 }
579 gspca_frame_add(gspca_dev, INTER_PACKET, data, len);
580 }
581