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stk-sensor.c
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1 /* stk-sensor.c: Driver for ov96xx sensor (used in some Syntek webcams)
2  *
3  * Copyright 2007-2008 Jaime Velasco Juan <[email protected]>
4  *
5  * Some parts derived from ov7670.c:
6  * Copyright 2006 One Laptop Per Child Association, Inc. Written
7  * by Jonathan Corbet with substantial inspiration from Mark
8  * McClelland's ovcamchip code.
9  *
10  * Copyright 2006-7 Jonathan Corbet <[email protected]>
11  *
12  * This file may be distributed under the terms of the GNU General
13  * This program is free software; you can redistribute it and/or modify
14  * it under the terms of the GNU General Public License as published by
15  * the Free Software Foundation; either version 2 of the License, or
16  * (at your option) any later version.
17  *
18  * This program is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21  * GNU General Public License for more details.
22  *
23  * You should have received a copy of the GNU General Public License
24  * along with this program; if not, write to the Free Software
25  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26  */
27 
28 /* Controlling the sensor via the STK1125 vendor specific control interface:
29  * The camera uses an OmniVision sensor and the stk1125 provides an
30  * SCCB(i2c)-USB bridge which let us program the sensor.
31  * In my case the sensor id is 0x9652, it can be read from sensor's register
32  * 0x0A and 0x0B as follows:
33  * - read register #R:
34  * output #R to index 0x0208
35  * output 0x0070 to index 0x0200
36  * input 1 byte from index 0x0201 (some kind of status register)
37  * until its value is 0x01
38  * input 1 byte from index 0x0209. This is the value of #R
39  * - write value V to register #R
40  * output #R to index 0x0204
41  * output V to index 0x0205
42  * output 0x0005 to index 0x0200
43  * input 1 byte from index 0x0201 until its value becomes 0x04
44  */
45 
46 /* It seems the i2c bus is controlled with these registers */
47 
48 #include "stk-webcam.h"
49 
50 #define STK_IIC_BASE (0x0200)
51 # define STK_IIC_OP (STK_IIC_BASE)
52 # define STK_IIC_OP_TX (0x05)
53 # define STK_IIC_OP_RX (0x70)
54 # define STK_IIC_STAT (STK_IIC_BASE+1)
55 # define STK_IIC_STAT_TX_OK (0x04)
56 # define STK_IIC_STAT_RX_OK (0x01)
57 /* I don't know what does this register.
58  * when it is 0x00 or 0x01, we cannot talk to the sensor,
59  * other values work */
60 # define STK_IIC_ENABLE (STK_IIC_BASE+2)
61 # define STK_IIC_ENABLE_NO (0x00)
62 /* This is what the driver writes in windows */
63 # define STK_IIC_ENABLE_YES (0x1e)
64 /*
65  * Address of the slave. Seems like the binary driver look for the
66  * sensor in multiple places, attempting a reset sequence.
67  * We only know about the ov9650
68  */
69 # define STK_IIC_ADDR (STK_IIC_BASE+3)
70 # define STK_IIC_TX_INDEX (STK_IIC_BASE+4)
71 # define STK_IIC_TX_VALUE (STK_IIC_BASE+5)
72 # define STK_IIC_RX_INDEX (STK_IIC_BASE+8)
73 # define STK_IIC_RX_VALUE (STK_IIC_BASE+9)
74 
75 #define MAX_RETRIES (50)
76 
77 #define SENSOR_ADDRESS (0x60)
78 
79 /* From ov7670.c (These registers aren't fully accurate) */
80 
81 /* Registers */
82 #define REG_GAIN 0x00 /* Gain lower 8 bits (rest in vref) */
83 #define REG_BLUE 0x01 /* blue gain */
84 #define REG_RED 0x02 /* red gain */
85 #define REG_VREF 0x03 /* Pieces of GAIN, VSTART, VSTOP */
86 #define REG_COM1 0x04 /* Control 1 */
87 #define COM1_CCIR656 0x40 /* CCIR656 enable */
88 #define COM1_QFMT 0x20 /* QVGA/QCIF format */
89 #define COM1_SKIP_0 0x00 /* Do not skip any row */
90 #define COM1_SKIP_2 0x04 /* Skip 2 rows of 4 */
91 #define COM1_SKIP_3 0x08 /* Skip 3 rows of 4 */
92 #define REG_BAVE 0x05 /* U/B Average level */
93 #define REG_GbAVE 0x06 /* Y/Gb Average level */
94 #define REG_AECHH 0x07 /* AEC MS 5 bits */
95 #define REG_RAVE 0x08 /* V/R Average level */
96 #define REG_COM2 0x09 /* Control 2 */
97 #define COM2_SSLEEP 0x10 /* Soft sleep mode */
98 #define REG_PID 0x0a /* Product ID MSB */
99 #define REG_VER 0x0b /* Product ID LSB */
100 #define REG_COM3 0x0c /* Control 3 */
101 #define COM3_SWAP 0x40 /* Byte swap */
102 #define COM3_SCALEEN 0x08 /* Enable scaling */
103 #define COM3_DCWEN 0x04 /* Enable downsamp/crop/window */
104 #define REG_COM4 0x0d /* Control 4 */
105 #define REG_COM5 0x0e /* All "reserved" */
106 #define REG_COM6 0x0f /* Control 6 */
107 #define REG_AECH 0x10 /* More bits of AEC value */
108 #define REG_CLKRC 0x11 /* Clock control */
109 #define CLK_PLL 0x80 /* Enable internal PLL */
110 #define CLK_EXT 0x40 /* Use external clock directly */
111 #define CLK_SCALE 0x3f /* Mask for internal clock scale */
112 #define REG_COM7 0x12 /* Control 7 */
113 #define COM7_RESET 0x80 /* Register reset */
114 #define COM7_FMT_MASK 0x38
115 #define COM7_FMT_SXGA 0x00
116 #define COM7_FMT_VGA 0x40
117 #define COM7_FMT_CIF 0x20 /* CIF format */
118 #define COM7_FMT_QVGA 0x10 /* QVGA format */
119 #define COM7_FMT_QCIF 0x08 /* QCIF format */
120 #define COM7_RGB 0x04 /* bits 0 and 2 - RGB format */
121 #define COM7_YUV 0x00 /* YUV */
122 #define COM7_BAYER 0x01 /* Bayer format */
123 #define COM7_PBAYER 0x05 /* "Processed bayer" */
124 #define REG_COM8 0x13 /* Control 8 */
125 #define COM8_FASTAEC 0x80 /* Enable fast AGC/AEC */
126 #define COM8_AECSTEP 0x40 /* Unlimited AEC step size */
127 #define COM8_BFILT 0x20 /* Band filter enable */
128 #define COM8_AGC 0x04 /* Auto gain enable */
129 #define COM8_AWB 0x02 /* White balance enable */
130 #define COM8_AEC 0x01 /* Auto exposure enable */
131 #define REG_COM9 0x14 /* Control 9 - gain ceiling */
132 #define REG_COM10 0x15 /* Control 10 */
133 #define COM10_HSYNC 0x40 /* HSYNC instead of HREF */
134 #define COM10_PCLK_HB 0x20 /* Suppress PCLK on horiz blank */
135 #define COM10_HREF_REV 0x08 /* Reverse HREF */
136 #define COM10_VS_LEAD 0x04 /* VSYNC on clock leading edge */
137 #define COM10_VS_NEG 0x02 /* VSYNC negative */
138 #define COM10_HS_NEG 0x01 /* HSYNC negative */
139 #define REG_HSTART 0x17 /* Horiz start high bits */
140 #define REG_HSTOP 0x18 /* Horiz stop high bits */
141 #define REG_VSTART 0x19 /* Vert start high bits */
142 #define REG_VSTOP 0x1a /* Vert stop high bits */
143 #define REG_PSHFT 0x1b /* Pixel delay after HREF */
144 #define REG_MIDH 0x1c /* Manuf. ID high */
145 #define REG_MIDL 0x1d /* Manuf. ID low */
146 #define REG_MVFP 0x1e /* Mirror / vflip */
147 #define MVFP_MIRROR 0x20 /* Mirror image */
148 #define MVFP_FLIP 0x10 /* Vertical flip */
149 
150 #define REG_AEW 0x24 /* AGC upper limit */
151 #define REG_AEB 0x25 /* AGC lower limit */
152 #define REG_VPT 0x26 /* AGC/AEC fast mode op region */
153 #define REG_ADVFL 0x2d /* Insert dummy lines (LSB) */
154 #define REG_ADVFH 0x2e /* Insert dummy lines (MSB) */
155 #define REG_HSYST 0x30 /* HSYNC rising edge delay */
156 #define REG_HSYEN 0x31 /* HSYNC falling edge delay */
157 #define REG_HREF 0x32 /* HREF pieces */
158 #define REG_TSLB 0x3a /* lots of stuff */
159 #define TSLB_YLAST 0x04 /* UYVY or VYUY - see com13 */
160 #define TSLB_BYTEORD 0x08 /* swap bytes in 16bit mode? */
161 #define REG_COM11 0x3b /* Control 11 */
162 #define COM11_NIGHT 0x80 /* NIght mode enable */
163 #define COM11_NMFR 0x60 /* Two bit NM frame rate */
164 #define COM11_HZAUTO 0x10 /* Auto detect 50/60 Hz */
165 #define COM11_50HZ 0x08 /* Manual 50Hz select */
166 #define COM11_EXP 0x02
167 #define REG_COM12 0x3c /* Control 12 */
168 #define COM12_HREF 0x80 /* HREF always */
169 #define REG_COM13 0x3d /* Control 13 */
170 #define COM13_GAMMA 0x80 /* Gamma enable */
171 #define COM13_UVSAT 0x40 /* UV saturation auto adjustment */
172 #define COM13_CMATRIX 0x10 /* Enable color matrix for RGB or YUV */
173 #define COM13_UVSWAP 0x01 /* V before U - w/TSLB */
174 #define REG_COM14 0x3e /* Control 14 */
175 #define COM14_DCWEN 0x10 /* DCW/PCLK-scale enable */
176 #define REG_EDGE 0x3f /* Edge enhancement factor */
177 #define REG_COM15 0x40 /* Control 15 */
178 #define COM15_R10F0 0x00 /* Data range 10 to F0 */
179 #define COM15_R01FE 0x80 /* 01 to FE */
180 #define COM15_R00FF 0xc0 /* 00 to FF */
181 #define COM15_RGB565 0x10 /* RGB565 output */
182 #define COM15_RGBFIXME 0x20 /* FIXME */
183 #define COM15_RGB555 0x30 /* RGB555 output */
184 #define REG_COM16 0x41 /* Control 16 */
185 #define COM16_AWBGAIN 0x08 /* AWB gain enable */
186 #define REG_COM17 0x42 /* Control 17 */
187 #define COM17_AECWIN 0xc0 /* AEC window - must match COM4 */
188 #define COM17_CBAR 0x08 /* DSP Color bar */
189 
190 /*
191  * This matrix defines how the colors are generated, must be
192  * tweaked to adjust hue and saturation.
193  *
194  * Order: v-red, v-green, v-blue, u-red, u-green, u-blue
195  *
196  * They are nine-bit signed quantities, with the sign bit
197  * stored in 0x58. Sign for v-red is bit 0, and up from there.
198  */
199 #define REG_CMATRIX_BASE 0x4f
200 #define CMATRIX_LEN 6
201 #define REG_CMATRIX_SIGN 0x58
202 
203 
204 #define REG_BRIGHT 0x55 /* Brightness */
205 #define REG_CONTRAS 0x56 /* Contrast control */
206 
207 #define REG_GFIX 0x69 /* Fix gain control */
208 
209 #define REG_RGB444 0x8c /* RGB 444 control */
210 #define R444_ENABLE 0x02 /* Turn on RGB444, overrides 5x5 */
211 #define R444_RGBX 0x01 /* Empty nibble at end */
212 
213 #define REG_HAECC1 0x9f /* Hist AEC/AGC control 1 */
214 #define REG_HAECC2 0xa0 /* Hist AEC/AGC control 2 */
215 
216 #define REG_BD50MAX 0xa5 /* 50hz banding step limit */
217 #define REG_HAECC3 0xa6 /* Hist AEC/AGC control 3 */
218 #define REG_HAECC4 0xa7 /* Hist AEC/AGC control 4 */
219 #define REG_HAECC5 0xa8 /* Hist AEC/AGC control 5 */
220 #define REG_HAECC6 0xa9 /* Hist AEC/AGC control 6 */
221 #define REG_HAECC7 0xaa /* Hist AEC/AGC control 7 */
222 #define REG_BD60MAX 0xab /* 60hz banding step limit */
223 
224 
225 
226 
227 /* Returns 0 if OK */
228 static int stk_sensor_outb(struct stk_camera *dev, u8 reg, u8 val)
229 {
230  int i = 0;
231  int tmpval = 0;
232 
233  if (stk_camera_write_reg(dev, STK_IIC_TX_INDEX, reg))
234  return 1;
235  if (stk_camera_write_reg(dev, STK_IIC_TX_VALUE, val))
236  return 1;
237  if (stk_camera_write_reg(dev, STK_IIC_OP, STK_IIC_OP_TX))
238  return 1;
239  do {
240  if (stk_camera_read_reg(dev, STK_IIC_STAT, &tmpval))
241  return 1;
242  i++;
243  } while (tmpval == 0 && i < MAX_RETRIES);
244  if (tmpval != STK_IIC_STAT_TX_OK) {
245  if (tmpval)
246  STK_ERROR("stk_sensor_outb failed, status=0x%02x\n",
247  tmpval);
248  return 1;
249  } else
250  return 0;
251 }
252 
253 static int stk_sensor_inb(struct stk_camera *dev, u8 reg, u8 *val)
254 {
255  int i = 0;
256  int tmpval = 0;
257 
258  if (stk_camera_write_reg(dev, STK_IIC_RX_INDEX, reg))
259  return 1;
260  if (stk_camera_write_reg(dev, STK_IIC_OP, STK_IIC_OP_RX))
261  return 1;
262  do {
263  if (stk_camera_read_reg(dev, STK_IIC_STAT, &tmpval))
264  return 1;
265  i++;
266  } while (tmpval == 0 && i < MAX_RETRIES);
267  if (tmpval != STK_IIC_STAT_RX_OK) {
268  if (tmpval)
269  STK_ERROR("stk_sensor_inb failed, status=0x%02x\n",
270  tmpval);
271  return 1;
272  }
273 
274  if (stk_camera_read_reg(dev, STK_IIC_RX_VALUE, &tmpval))
275  return 1;
276 
277  *val = (u8) tmpval;
278  return 0;
279 }
280 
281 static int stk_sensor_write_regvals(struct stk_camera *dev,
282  struct regval *rv)
283 {
284  int ret;
285  if (rv == NULL)
286  return 0;
287  while (rv->reg != 0xff || rv->val != 0xff) {
288  ret = stk_sensor_outb(dev, rv->reg, rv->val);
289  if (ret != 0)
290  return ret;
291  rv++;
292  }
293  return 0;
294 }
295 
296 int stk_sensor_sleep(struct stk_camera *dev)
297 {
298  u8 tmp;
299  return stk_sensor_inb(dev, REG_COM2, &tmp)
300  || stk_sensor_outb(dev, REG_COM2, tmp|COM2_SSLEEP);
301 }
302 
303 int stk_sensor_wakeup(struct stk_camera *dev)
304 {
305  u8 tmp;
306  return stk_sensor_inb(dev, REG_COM2, &tmp)
307  || stk_sensor_outb(dev, REG_COM2, tmp&~COM2_SSLEEP);
308 }
309 
310 static struct regval ov_initvals[] = {
311  {REG_CLKRC, CLK_PLL},
312  {REG_COM11, 0x01},
313  {0x6a, 0x7d},
314  {REG_AECH, 0x40},
315  {REG_GAIN, 0x00},
316  {REG_BLUE, 0x80},
317  {REG_RED, 0x80},
318  /* Do not enable fast AEC for now */
319  /*{REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC},*/
320  {REG_COM8, COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC},
321  {0x39, 0x50}, {0x38, 0x93},
322  {0x37, 0x00}, {0x35, 0x81},
323  {REG_COM5, 0x20},
324  {REG_COM1, 0x00},
325  {REG_COM3, 0x00},
326  {REG_COM4, 0x00},
327  {REG_PSHFT, 0x00},
328  {0x16, 0x07},
329  {0x33, 0xe2}, {0x34, 0xbf},
330  {REG_COM16, 0x00},
331  {0x96, 0x04},
332  /* Gamma curve values */
333 /* { 0x7a, 0x20 }, { 0x7b, 0x10 },
334  { 0x7c, 0x1e }, { 0x7d, 0x35 },
335  { 0x7e, 0x5a }, { 0x7f, 0x69 },
336  { 0x80, 0x76 }, { 0x81, 0x80 },
337  { 0x82, 0x88 }, { 0x83, 0x8f },
338  { 0x84, 0x96 }, { 0x85, 0xa3 },
339  { 0x86, 0xaf }, { 0x87, 0xc4 },
340  { 0x88, 0xd7 }, { 0x89, 0xe8 },
341 */
342  {REG_GFIX, 0x40},
343  {0x8e, 0x00},
344  {REG_COM12, 0x73},
345  {0x8f, 0xdf}, {0x8b, 0x06},
346  {0x8c, 0x20},
347  {0x94, 0x88}, {0x95, 0x88},
348 /* {REG_COM15, 0xc1}, TODO */
349  {0x29, 0x3f},
350  {REG_COM6, 0x42},
351  {REG_BD50MAX, 0x80},
352  {REG_HAECC6, 0xb8}, {REG_HAECC7, 0x92},
353  {REG_BD60MAX, 0x0a},
354  {0x90, 0x00}, {0x91, 0x00},
355  {REG_HAECC1, 0x00}, {REG_HAECC2, 0x00},
356  {REG_AEW, 0x68}, {REG_AEB, 0x5c},
357  {REG_VPT, 0xc3},
358  {REG_COM9, 0x2e},
359  {0x2a, 0x00}, {0x2b, 0x00},
360 
361  {0xff, 0xff}, /* END MARKER */
362 };
363 
364 /* Probe the I2C bus and initialise the sensor chip */
365 int stk_sensor_init(struct stk_camera *dev)
366 {
367  u8 idl = 0;
368  u8 idh = 0;
369 
370  if (stk_camera_write_reg(dev, STK_IIC_ENABLE, STK_IIC_ENABLE_YES)
371  || stk_camera_write_reg(dev, STK_IIC_ADDR, SENSOR_ADDRESS)
372  || stk_sensor_outb(dev, REG_COM7, COM7_RESET)) {
373  STK_ERROR("Sensor resetting failed\n");
374  return -ENODEV;
375  }
376  msleep(10);
377  /* Read the manufacturer ID: ov = 0x7FA2 */
378  if (stk_sensor_inb(dev, REG_MIDH, &idh)
379  || stk_sensor_inb(dev, REG_MIDL, &idl)) {
380  STK_ERROR("Strange error reading sensor ID\n");
381  return -ENODEV;
382  }
383  if (idh != 0x7f || idl != 0xa2) {
384  STK_ERROR("Huh? you don't have a sensor from ovt\n");
385  return -ENODEV;
386  }
387  if (stk_sensor_inb(dev, REG_PID, &idh)
388  || stk_sensor_inb(dev, REG_VER, &idl)) {
389  STK_ERROR("Could not read sensor model\n");
390  return -ENODEV;
391  }
392  stk_sensor_write_regvals(dev, ov_initvals);
393  msleep(10);
394  STK_INFO("OmniVision sensor detected, id %02X%02X"
395  " at address %x\n", idh, idl, SENSOR_ADDRESS);
396  return 0;
397 }
398 
399 /* V4L2_PIX_FMT_UYVY */
400 static struct regval ov_fmt_uyvy[] = {
401  {REG_TSLB, TSLB_YLAST|0x08 },
402  { 0x4f, 0x80 }, /* "matrix coefficient 1" */
403  { 0x50, 0x80 }, /* "matrix coefficient 2" */
404  { 0x51, 0 }, /* vb */
405  { 0x52, 0x22 }, /* "matrix coefficient 4" */
406  { 0x53, 0x5e }, /* "matrix coefficient 5" */
407  { 0x54, 0x80 }, /* "matrix coefficient 6" */
408  {REG_COM13, COM13_UVSAT|COM13_CMATRIX},
409  {REG_COM15, COM15_R00FF },
410  {0xff, 0xff}, /* END MARKER */
411 };
412 /* V4L2_PIX_FMT_YUYV */
413 static struct regval ov_fmt_yuyv[] = {
414  {REG_TSLB, 0 },
415  { 0x4f, 0x80 }, /* "matrix coefficient 1" */
416  { 0x50, 0x80 }, /* "matrix coefficient 2" */
417  { 0x51, 0 }, /* vb */
418  { 0x52, 0x22 }, /* "matrix coefficient 4" */
419  { 0x53, 0x5e }, /* "matrix coefficient 5" */
420  { 0x54, 0x80 }, /* "matrix coefficient 6" */
421  {REG_COM13, COM13_UVSAT|COM13_CMATRIX},
422  {REG_COM15, COM15_R00FF },
423  {0xff, 0xff}, /* END MARKER */
424 };
425 
426 /* V4L2_PIX_FMT_RGB565X rrrrrggg gggbbbbb */
427 static struct regval ov_fmt_rgbr[] = {
428  { REG_RGB444, 0 }, /* No RGB444 please */
429  {REG_TSLB, 0x00},
430  { REG_COM1, 0x0 },
431  { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */
432  { 0x4f, 0xb3 }, /* "matrix coefficient 1" */
433  { 0x50, 0xb3 }, /* "matrix coefficient 2" */
434  { 0x51, 0 }, /* vb */
435  { 0x52, 0x3d }, /* "matrix coefficient 4" */
436  { 0x53, 0xa7 }, /* "matrix coefficient 5" */
437  { 0x54, 0xe4 }, /* "matrix coefficient 6" */
438  { REG_COM13, COM13_GAMMA },
439  { REG_COM15, COM15_RGB565|COM15_R00FF },
440  { 0xff, 0xff },
441 };
442 
443 /* V4L2_PIX_FMT_RGB565 gggbbbbb rrrrrggg */
444 static struct regval ov_fmt_rgbp[] = {
445  { REG_RGB444, 0 }, /* No RGB444 please */
446  {REG_TSLB, TSLB_BYTEORD },
447  { REG_COM1, 0x0 },
448  { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */
449  { 0x4f, 0xb3 }, /* "matrix coefficient 1" */
450  { 0x50, 0xb3 }, /* "matrix coefficient 2" */
451  { 0x51, 0 }, /* vb */
452  { 0x52, 0x3d }, /* "matrix coefficient 4" */
453  { 0x53, 0xa7 }, /* "matrix coefficient 5" */
454  { 0x54, 0xe4 }, /* "matrix coefficient 6" */
455  { REG_COM13, COM13_GAMMA },
456  { REG_COM15, COM15_RGB565|COM15_R00FF },
457  { 0xff, 0xff },
458 };
459 
460 /* V4L2_PIX_FMT_SRGGB8 */
461 static struct regval ov_fmt_bayer[] = {
462  /* This changes color order */
463  {REG_TSLB, 0x40}, /* BGGR */
464  /* {REG_TSLB, 0x08}, */ /* BGGR with vertical image flipping */
465  {REG_COM15, COM15_R00FF },
466  {0xff, 0xff}, /* END MARKER */
467 };
468 /*
469  * Store a set of start/stop values into the camera.
470  */
471 static int stk_sensor_set_hw(struct stk_camera *dev,
472  int hstart, int hstop, int vstart, int vstop)
473 {
474  int ret;
475  unsigned char v;
476 /*
477  * Horizontal: 11 bits, top 8 live in hstart and hstop. Bottom 3 of
478  * hstart are in href[2:0], bottom 3 of hstop in href[5:3]. There is
479  * a mystery "edge offset" value in the top two bits of href.
480  */
481  ret = stk_sensor_outb(dev, REG_HSTART, (hstart >> 3) & 0xff);
482  ret += stk_sensor_outb(dev, REG_HSTOP, (hstop >> 3) & 0xff);
483  ret += stk_sensor_inb(dev, REG_HREF, &v);
484  v = (v & 0xc0) | ((hstop & 0x7) << 3) | (hstart & 0x7);
485  msleep(10);
486  ret += stk_sensor_outb(dev, REG_HREF, v);
487 /*
488  * Vertical: similar arrangement (note: this is different from ov7670.c)
489  */
490  ret += stk_sensor_outb(dev, REG_VSTART, (vstart >> 3) & 0xff);
491  ret += stk_sensor_outb(dev, REG_VSTOP, (vstop >> 3) & 0xff);
492  ret += stk_sensor_inb(dev, REG_VREF, &v);
493  v = (v & 0xc0) | ((vstop & 0x7) << 3) | (vstart & 0x7);
494  msleep(10);
495  ret += stk_sensor_outb(dev, REG_VREF, v);
496  return ret;
497 }
498 
499 
500 int stk_sensor_configure(struct stk_camera *dev)
501 {
502  int com7;
503  /*
504  * We setup the sensor to output dummy lines in low-res modes,
505  * so we don't get absurdly hight framerates.
506  */
507  unsigned dummylines;
508  int flip;
509  struct regval *rv;
510 
511  switch (dev->vsettings.mode) {
512  case MODE_QCIF: com7 = COM7_FMT_QCIF;
513  dummylines = 604;
514  break;
515  case MODE_QVGA: com7 = COM7_FMT_QVGA;
516  dummylines = 267;
517  break;
518  case MODE_CIF: com7 = COM7_FMT_CIF;
519  dummylines = 412;
520  break;
521  case MODE_VGA: com7 = COM7_FMT_VGA;
522  dummylines = 11;
523  break;
524  case MODE_SXGA: com7 = COM7_FMT_SXGA;
525  dummylines = 0;
526  break;
527  default: STK_ERROR("Unsupported mode %d\n", dev->vsettings.mode);
528  return -EFAULT;
529  }
530  switch (dev->vsettings.palette) {
531  case V4L2_PIX_FMT_UYVY:
532  com7 |= COM7_YUV;
533  rv = ov_fmt_uyvy;
534  break;
535  case V4L2_PIX_FMT_YUYV:
536  com7 |= COM7_YUV;
537  rv = ov_fmt_yuyv;
538  break;
539  case V4L2_PIX_FMT_RGB565:
540  com7 |= COM7_RGB;
541  rv = ov_fmt_rgbp;
542  break;
543  case V4L2_PIX_FMT_RGB565X:
544  com7 |= COM7_RGB;
545  rv = ov_fmt_rgbr;
546  break;
547  case V4L2_PIX_FMT_SBGGR8:
548  com7 |= COM7_PBAYER;
549  rv = ov_fmt_bayer;
550  break;
551  default: STK_ERROR("Unsupported colorspace\n");
552  return -EFAULT;
553  }
554  /*FIXME sometimes the sensor go to a bad state
555  stk_sensor_write_regvals(dev, ov_initvals); */
556  stk_sensor_outb(dev, REG_COM7, com7);
557  msleep(50);
558  stk_sensor_write_regvals(dev, rv);
559  flip = (dev->vsettings.vflip?MVFP_FLIP:0)
560  | (dev->vsettings.hflip?MVFP_MIRROR:0);
561  stk_sensor_outb(dev, REG_MVFP, flip);
562  if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8
563  && !dev->vsettings.vflip)
564  stk_sensor_outb(dev, REG_TSLB, 0x08);
565  stk_sensor_outb(dev, REG_ADVFH, dummylines >> 8);
566  stk_sensor_outb(dev, REG_ADVFL, dummylines & 0xff);
567  msleep(50);
568  switch (dev->vsettings.mode) {
569  case MODE_VGA:
570  if (stk_sensor_set_hw(dev, 302, 1582, 6, 486))
571  STK_ERROR("stk_sensor_set_hw failed (VGA)\n");
572  break;
573  case MODE_SXGA:
574  case MODE_CIF:
575  case MODE_QVGA:
576  case MODE_QCIF:
577  /*FIXME These settings seem ignored by the sensor
578  if (stk_sensor_set_hw(dev, 220, 1500, 10, 1034))
579  STK_ERROR("stk_sensor_set_hw failed (SXGA)\n");
580  */
581  break;
582  }
583  msleep(10);
584  return 0;
585 }
586 
587 int stk_sensor_set_brightness(struct stk_camera *dev, int br)
588 {
589  if (br < 0 || br > 0xff)
590  return -EINVAL;
591  stk_sensor_outb(dev, REG_AEB, max(0x00, br - 6));
592  stk_sensor_outb(dev, REG_AEW, min(0xff, br + 6));
593  return 0;
594 }
595 
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