aboutsummaryrefslogtreecommitdiffstats
path: root/drivers
diff options
context:
space:
mode:
Diffstat (limited to 'drivers')
-rw-r--r--drivers/media/video/Kconfig8
-rw-r--r--drivers/media/video/Makefile1
-rw-r--r--drivers/media/video/ov7670.c1002
3 files changed, 1011 insertions, 0 deletions
diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index 4ea1d0ebf5fd..c95735cd688c 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -184,6 +184,14 @@ config VIDEO_KS0127
184 To compile this driver as a module, choose M here: the 184 To compile this driver as a module, choose M here: the
185 module will be called ks0127. 185 module will be called ks0127.
186 186
187config VIDEO_OV7670
188 tristate "OmniVision OV7670 sensor support"
189 depends on I2C && VIDEO_V4L2
190 ---help---
191 This is a Video4Linux2 sensor-level driver for the OmniVision
192 OV7670 VGA camera. It currently only works with the M88ALP01
193 controller.
194
187config VIDEO_SAA7110 195config VIDEO_SAA7110
188 tristate "Philips SAA7110 video decoder" 196 tristate "Philips SAA7110 video decoder"
189 depends on VIDEO_V4L1 && I2C 197 depends on VIDEO_V4L1 && I2C
diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index 8ff787a4cf6a..2adb56d01ef6 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -93,6 +93,7 @@ obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
93obj-$(CONFIG_VIDEO_CX2341X) += cx2341x.o 93obj-$(CONFIG_VIDEO_CX2341X) += cx2341x.o
94 94
95obj-$(CONFIG_VIDEO_CAFE_CCIC) += cafe_ccic.o 95obj-$(CONFIG_VIDEO_CAFE_CCIC) += cafe_ccic.o
96obj-$(CONFIG_VIDEO_OV7670) += ov7670.o
96 97
97obj-$(CONFIG_USB_DABUSB) += dabusb.o 98obj-$(CONFIG_USB_DABUSB) += dabusb.o
98obj-$(CONFIG_USB_OV511) += ov511.o 99obj-$(CONFIG_USB_OV511) += ov511.o
diff --git a/drivers/media/video/ov7670.c b/drivers/media/video/ov7670.c
new file mode 100644
index 000000000000..382aa83b73c5
--- /dev/null
+++ b/drivers/media/video/ov7670.c
@@ -0,0 +1,1002 @@
1/*
2 * A V4L2 driver for OmniVision OV7670 cameras.
3 *
4 * Copyright 2006 One Laptop Per Child Association, Inc. Written
5 * by Jonathan Corbet with substantial inspiration from Mark
6 * McClelland's ovcamchip code.
7 *
8 * This file may be distributed under the terms of the GNU General
9 * Public License, version 2.
10 */
11#include <linux/init.h>
12#include <linux/module.h>
13#include <linux/moduleparam.h>
14#include <linux/slab.h>
15#include <linux/delay.h>
16#include <linux/videodev.h>
17#include <media/v4l2-common.h>
18#include <linux/i2c.h>
19
20
21MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net.");
22MODULE_DESCRIPTION("A low-level driver for OmniVision ov7670 sensors");
23MODULE_LICENSE("GPL");
24
25/*
26 * Basic window sizes. These probably belong somewhere more globally
27 * useful.
28 */
29#define VGA_WIDTH 640
30#define VGA_HEIGHT 480
31#define QVGA_WIDTH 320
32#define QVGA_HEIGHT 240
33#define CIF_WIDTH 352
34#define CIF_HEIGHT 288
35#define QCIF_WIDTH 176
36#define QCIF_HEIGHT 144
37
38/*
39 * The 7670 sits on i2c with ID 0x42
40 */
41#define OV7670_I2C_ADDR 0x42
42
43/* Registers */
44#define REG_GAIN 0x00 /* Gain lower 8 bits (rest in vref) */
45#define REG_BLUE 0x01 /* blue gain */
46#define REG_RED 0x02 /* red gain */
47#define REG_VREF 0x03 /* Pieces of GAIN, VSTART, VSTOP */
48#define REG_COM1 0x04 /* Control 1 */
49#define COM1_CCIR656 0x40 /* CCIR656 enable */
50#define REG_BAVE 0x05 /* U/B Average level */
51#define REG_GbAVE 0x06 /* Y/Gb Average level */
52#define REG_AECHH 0x07 /* AEC MS 5 bits */
53#define REG_RAVE 0x08 /* V/R Average level */
54#define REG_COM2 0x09 /* Control 2 */
55#define COM2_SSLEEP 0x10 /* Soft sleep mode */
56#define REG_PID 0x0a /* Product ID MSB */
57#define REG_VER 0x0b /* Product ID LSB */
58#define REG_COM3 0x0c /* Control 3 */
59#define COM3_SWAP 0x40 /* Byte swap */
60#define COM3_SCALEEN 0x08 /* Enable scaling */
61#define COM3_DCWEN 0x04 /* Enable downsamp/crop/window */
62#define REG_COM4 0x0d /* Control 4 */
63#define REG_COM5 0x0e /* All "reserved" */
64#define REG_COM6 0x0f /* Control 6 */
65#define REG_AECH 0x10 /* More bits of AEC value */
66#define REG_CLKRC 0x11 /* Clocl control */
67#define CLK_EXT 0x40 /* Use external clock directly */
68#define CLK_SCALE 0x3f /* Mask for internal clock scale */
69#define REG_COM7 0x12 /* Control 7 */
70#define COM7_RESET 0x80 /* Register reset */
71#define COM7_FMT_MASK 0x38
72#define COM7_FMT_VGA 0x00
73#define COM7_FMT_CIF 0x20 /* CIF format */
74#define COM7_FMT_QVGA 0x10 /* QVGA format */
75#define COM7_FMT_QCIF 0x08 /* QCIF format */
76#define COM7_RGB 0x04 /* bits 0 and 2 - RGB format */
77#define COM7_YUV 0x00 /* YUV */
78#define COM7_BAYER 0x01 /* Bayer format */
79#define COM7_PBAYER 0x05 /* "Processed bayer" */
80#define REG_COM8 0x13 /* Control 8 */
81#define COM8_FASTAEC 0x80 /* Enable fast AGC/AEC */
82#define COM8_AECSTEP 0x40 /* Unlimited AEC step size */
83#define COM8_BFILT 0x20 /* Band filter enable */
84#define COM8_AGC 0x04 /* Auto gain enable */
85#define COM8_AWB 0x02 /* White balance enable */
86#define COM8_AEC 0x01 /* Auto exposure enable */
87#define REG_COM9 0x14 /* Control 9 - gain ceiling */
88#define REG_COM10 0x15 /* Control 10 */
89#define COM10_HSYNC 0x40 /* HSYNC instead of HREF */
90#define COM10_PCLK_HB 0x20 /* Suppress PCLK on horiz blank */
91#define COM10_HREF_REV 0x08 /* Reverse HREF */
92#define COM10_VS_LEAD 0x04 /* VSYNC on clock leading edge */
93#define COM10_VS_NEG 0x02 /* VSYNC negative */
94#define COM10_HS_NEG 0x01 /* HSYNC negative */
95#define REG_HSTART 0x17 /* Horiz start high bits */
96#define REG_HSTOP 0x18 /* Horiz stop high bits */
97#define REG_VSTART 0x19 /* Vert start high bits */
98#define REG_VSTOP 0x1a /* Vert stop high bits */
99#define REG_PSHFT 0x1b /* Pixel delay after HREF */
100#define REG_MIDH 0x1c /* Manuf. ID high */
101#define REG_MIDL 0x1d /* Manuf. ID low */
102#define REG_MVFP 0x1e /* Mirror / vflip */
103#define MVFP_MIRROR 0x20 /* Mirror image */
104#define MVFP_FLIP 0x10 /* Vertical flip */
105
106#define REG_AEW 0x24 /* AGC upper limit */
107#define REG_AEB 0x25 /* AGC lower limit */
108#define REG_VPT 0x26 /* AGC/AEC fast mode op region */
109#define REG_HSYST 0x30 /* HSYNC rising edge delay */
110#define REG_HSYEN 0x31 /* HSYNC falling edge delay */
111#define REG_HREF 0x32 /* HREF pieces */
112#define REG_TSLB 0x3a /* lots of stuff */
113#define TSLB_YLAST 0x04 /* UYVY or VYUY - see com13 */
114#define REG_COM11 0x3b /* Control 11 */
115#define COM11_NIGHT 0x80 /* NIght mode enable */
116#define COM11_NMFR 0x60 /* Two bit NM frame rate */
117#define COM11_HZAUTO 0x10 /* Auto detect 50/60 Hz */
118#define COM11_50HZ 0x08 /* Manual 50Hz select */
119#define COM11_EXP 0x02
120#define REG_COM12 0x3c /* Control 12 */
121#define COM12_HREF 0x80 /* HREF always */
122#define REG_COM13 0x3d /* Control 13 */
123#define COM13_GAMMA 0x80 /* Gamma enable */
124#define COM13_UVSAT 0x40 /* UV saturation auto adjustment */
125#define COM13_UVSWAP 0x01 /* V before U - w/TSLB */
126#define REG_COM14 0x3e /* Control 14 */
127#define COM14_DCWEN 0x10 /* DCW/PCLK-scale enable */
128#define REG_EDGE 0x3f /* Edge enhancement factor */
129#define REG_COM15 0x40 /* Control 15 */
130#define COM15_R10F0 0x00 /* Data range 10 to F0 */
131#define COM15_R01FE 0x80 /* 01 to FE */
132#define COM15_R00FF 0xc0 /* 00 to FF */
133#define COM15_RGB565 0x10 /* RGB565 output */
134#define COM15_RGB555 0x30 /* RGB555 output */
135#define REG_COM16 0x41 /* Control 16 */
136#define COM16_AWBGAIN 0x08 /* AWB gain enable */
137#define REG_COM17 0x42 /* Control 17 */
138#define COM17_AECWIN 0xc0 /* AEC window - must match COM4 */
139#define COM17_CBAR 0x08 /* DSP Color bar */
140
141#define REG_BRIGHT 0x55 /* Brightness */
142#define REG_CONTRAS 0x56 /* Contrast control */
143
144#define REG_GFIX 0x69 /* Fix gain control */
145
146#define REG_RGB444 0x8c /* RGB 444 control */
147#define R444_ENABLE 0x02 /* Turn on RGB444, overrides 5x5 */
148#define R444_RGBX 0x01 /* Empty nibble at end */
149
150#define REG_HAECC1 0x9f /* Hist AEC/AGC control 1 */
151#define REG_HAECC2 0xa0 /* Hist AEC/AGC control 2 */
152
153#define REG_BD50MAX 0xa5 /* 50hz banding step limit */
154#define REG_HAECC3 0xa6 /* Hist AEC/AGC control 3 */
155#define REG_HAECC4 0xa7 /* Hist AEC/AGC control 4 */
156#define REG_HAECC5 0xa8 /* Hist AEC/AGC control 5 */
157#define REG_HAECC6 0xa9 /* Hist AEC/AGC control 6 */
158#define REG_HAECC7 0xaa /* Hist AEC/AGC control 7 */
159#define REG_BD60MAX 0xab /* 60hz banding step limit */
160
161
162/*
163 * The default register settings, as obtained from OmniVision. There
164 * is really no making sense of most of these - lots of "reserved" values
165 * and such.
166 *
167 * These settings give VGA YUYV.
168 */
169
170struct regval_list {
171 unsigned char reg_num;
172 unsigned char value;
173};
174
175static struct regval_list ov7670_default_regs[] = {
176 { REG_COM7, COM7_RESET },
177/*
178 * Clock scale: 3 = 15fps
179 * 2 = 20fps
180 * 1 = 30fps
181 */
182 { REG_CLKRC, 0x1 }, /* OV: clock scale (15 fps) */
183 { REG_TSLB, 0x04 }, /* OV */
184 { REG_COM7, 0 }, /* VGA */
185 /*
186 * Set the hardware window. These values from OV don't entirely
187 * make sense - hstop is less than hstart. But they work...
188 */
189 { REG_HSTART, 0x13 }, { REG_HSTOP, 0x01 },
190 { REG_HREF, 0xb6 }, { REG_VSTART, 0x02 },
191 { REG_VSTOP, 0x7a }, { REG_VREF, 0x0a },
192
193 { REG_COM3, 0 }, { REG_COM14, 0 },
194 /* Mystery scaling numbers */
195 { 0x70, 0x3a }, { 0x71, 0x35 },
196 { 0x72, 0x11 }, { 0x73, 0xf0 },
197 { 0xa2, 0x02 }, { REG_COM10, 0x0 },
198
199 /* Gamma curve values */
200 { 0x7a, 0x20 }, { 0x7b, 0x10 },
201 { 0x7c, 0x1e }, { 0x7d, 0x35 },
202 { 0x7e, 0x5a }, { 0x7f, 0x69 },
203 { 0x80, 0x76 }, { 0x81, 0x80 },
204 { 0x82, 0x88 }, { 0x83, 0x8f },
205 { 0x84, 0x96 }, { 0x85, 0xa3 },
206 { 0x86, 0xaf }, { 0x87, 0xc4 },
207 { 0x88, 0xd7 }, { 0x89, 0xe8 },
208
209 /* AGC and AEC parameters. Note we start by disabling those features,
210 then turn them only after tweaking the values. */
211 { REG_COM8, COM8_FASTAEC | COM8_AECSTEP | COM8_BFILT },
212 { REG_GAIN, 0 }, { REG_AECH, 0 },
213 { REG_COM4, 0x40 }, /* magic reserved bit */
214 { REG_COM9, 0x18 }, /* 4x gain + magic rsvd bit */
215 { REG_BD50MAX, 0x05 }, { REG_BD60MAX, 0x07 },
216 { REG_AEW, 0x95 }, { REG_AEB, 0x33 },
217 { REG_VPT, 0xe3 }, { REG_HAECC1, 0x78 },
218 { REG_HAECC2, 0x68 }, { 0xa1, 0x03 }, /* magic */
219 { REG_HAECC3, 0xd8 }, { REG_HAECC4, 0xd8 },
220 { REG_HAECC5, 0xf0 }, { REG_HAECC6, 0x90 },
221 { REG_HAECC7, 0x94 },
222 { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC },
223
224 /* Almost all of these are magic "reserved" values. */
225 { REG_COM5, 0x61 }, { REG_COM6, 0x4b },
226 { 0x16, 0x02 }, { REG_MVFP, 0x07|MVFP_MIRROR },
227 { 0x21, 0x02 }, { 0x22, 0x91 },
228 { 0x29, 0x07 }, { 0x33, 0x0b },
229 { 0x35, 0x0b }, { 0x37, 0x1d },
230 { 0x38, 0x71 }, { 0x39, 0x2a },
231 { REG_COM12, 0x78 }, { 0x4d, 0x40 },
232 { 0x4e, 0x20 }, { REG_GFIX, 0 },
233 { 0x6b, 0x4a }, { 0x74, 0x10 },
234 { 0x8d, 0x4f }, { 0x8e, 0 },
235 { 0x8f, 0 }, { 0x90, 0 },
236 { 0x91, 0 }, { 0x96, 0 },
237 { 0x9a, 0 }, { 0xb0, 0x84 },
238 { 0xb1, 0x0c }, { 0xb2, 0x0e },
239 { 0xb3, 0x82 }, { 0xb8, 0x0a },
240
241 /* More reserved magic, some of which tweaks white balance */
242 { 0x43, 0x0a }, { 0x44, 0xf0 },
243 { 0x45, 0x34 }, { 0x46, 0x58 },
244 { 0x47, 0x28 }, { 0x48, 0x3a },
245 { 0x59, 0x88 }, { 0x5a, 0x88 },
246 { 0x5b, 0x44 }, { 0x5c, 0x67 },
247 { 0x5d, 0x49 }, { 0x5e, 0x0e },
248 { 0x6c, 0x0a }, { 0x6d, 0x55 },
249 { 0x6e, 0x11 }, { 0x6f, 0x9f }, /* "9e for advance AWB" */
250 { 0x6a, 0x40 }, { REG_BLUE, 0x40 },
251 { REG_RED, 0x60 },
252 { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC|COM8_AWB },
253
254 /* Matrix coefficients */
255 { 0x4f, 0x80 }, { 0x50, 0x80 },
256 { 0x51, 0 }, { 0x52, 0x22 },
257 { 0x53, 0x5e }, { 0x54, 0x80 },
258 { 0x58, 0x9e },
259
260 { REG_COM16, COM16_AWBGAIN }, { REG_EDGE, 0 },
261 { 0x75, 0x05 }, { 0x76, 0xe1 },
262 { 0x4c, 0 }, { 0x77, 0x01 },
263 { REG_COM13, 0xc3 }, { 0x4b, 0x09 },
264 { 0xc9, 0x60 }, { REG_COM16, 0x38 },
265 { 0x56, 0x40 },
266
267 { 0x34, 0x11 }, { REG_COM11, COM11_EXP },
268 { 0xa4, 0x88 }, { 0x96, 0 },
269 { 0x97, 0x30 }, { 0x98, 0x20 },
270 { 0x99, 0x30 }, { 0x9a, 0x84 },
271 { 0x9b, 0x29 }, { 0x9c, 0x03 },
272 { 0x9d, 0x4c }, { 0x9e, 0x3f },
273 { 0x78, 0x04 },
274
275 /* Extra-weird stuff. Some sort of multiplexor register */
276 { 0x79, 0x01 }, { 0xc8, 0xf0 },
277 { 0x79, 0x0f }, { 0xc8, 0x00 },
278 { 0x79, 0x10 }, { 0xc8, 0x7e },
279 { 0x79, 0x0a }, { 0xc8, 0x80 },
280 { 0x79, 0x0b }, { 0xc8, 0x01 },
281 { 0x79, 0x0c }, { 0xc8, 0x0f },
282 { 0x79, 0x0d }, { 0xc8, 0x20 },
283 { 0x79, 0x09 }, { 0xc8, 0x80 },
284 { 0x79, 0x02 }, { 0xc8, 0xc0 },
285 { 0x79, 0x03 }, { 0xc8, 0x40 },
286 { 0x79, 0x05 }, { 0xc8, 0x30 },
287 { 0x79, 0x26 },
288
289 /* Not sure if these should be here */
290 { 0xf1, 0x10 }, { 0x0f, 0x1d },
291 { 0x0f, 0x1f },
292
293 { 0xff, 0xff }, /* END MARKER */
294};
295
296
297/*
298 * Here we'll try to encapsulate the changes for just the output
299 * video format.
300 *
301 * RGB656 and YUV422 come from OV; RGB444 is homebrewed.
302 *
303 * IMPORTANT RULE: the first entry must be for COM7, see ov7670_s_fmt for why.
304 */
305
306
307static struct regval_list ov7670_fmt_yuv422[] = {
308 { REG_COM7, 0x0 }, /* Selects YUV mode */
309 { REG_RGB444, 0 }, /* No RGB444 please */
310 { REG_COM1, 0 },
311 { REG_COM15, COM15_R00FF },
312 { REG_COM9, 0x18 }, /* 4x gain ceiling; 0x8 is reserved bit */
313 { 0x4f, 0x80 }, /* "matrix coefficient 1" */
314 { 0x50, 0x80 }, /* "matrix coefficient 2" */
315 { 0x52, 0x22 }, /* "matrix coefficient 4" */
316 { 0x53, 0x5e }, /* "matrix coefficient 5" */
317 { 0x54, 0x80 }, /* "matrix coefficient 6" */
318 { REG_COM13, COM13_GAMMA|COM13_UVSAT },
319 { 0xff, 0xff },
320};
321
322static struct regval_list ov7670_fmt_rgb565[] = {
323 { REG_COM7, COM7_RGB }, /* Selects RGB mode */
324 { REG_RGB444, 0 }, /* No RGB444 please */
325 { REG_COM1, 0x0 },
326 { REG_COM15, COM15_RGB565 },
327 { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */
328 { 0x4f, 0xb3 }, /* "matrix coefficient 1" */
329 { 0x50, 0xb3 }, /* "matrix coefficient 2" */
330 { 0x52, 0x3d }, /* "matrix coefficient 4" */
331 { 0x53, 0xa7 }, /* "matrix coefficient 5" */
332 { 0x54, 0xe4 }, /* "matrix coefficient 6" */
333 { REG_COM13, COM13_GAMMA|COM13_UVSAT },
334 { 0xff, 0xff },
335};
336
337static struct regval_list ov7670_fmt_rgb444[] = {
338 { REG_COM7, COM7_RGB }, /* Selects RGB mode */
339 { REG_RGB444, R444_ENABLE }, /* Enable xxxxrrrr ggggbbbb */
340 { REG_COM1, 0x40 }, /* Magic reserved bit */
341 { REG_COM15, COM15_R01FE|COM15_RGB565 }, /* Data range needed? */
342 { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */
343 { 0x4f, 0xb3 }, /* "matrix coefficient 1" */
344 { 0x50, 0xb3 }, /* "matrix coefficient 2" */
345 { 0x52, 0x3d }, /* "matrix coefficient 4" */
346 { 0x53, 0xa7 }, /* "matrix coefficient 5" */
347 { 0x54, 0xe4 }, /* "matrix coefficient 6" */
348 { REG_COM13, COM13_GAMMA|COM13_UVSAT|0x2 }, /* Magic rsvd bit */
349 { 0xff, 0xff },
350};
351
352
353
354
355/*
356 * Low-level register I/O.
357 */
358
359static int ov7670_read(struct i2c_client *c, unsigned char reg,
360 unsigned char *value)
361{
362 int ret;
363
364 ret = i2c_smbus_read_byte_data(c, reg);
365 if (ret > 0)
366 *value = (unsigned char) ret;
367 return ret;
368}
369
370
371static int ov7670_write(struct i2c_client *c, unsigned char reg,
372 unsigned char value)
373{
374 return i2c_smbus_write_byte_data(c, reg, value);
375}
376
377
378/*
379 * Write a list of register settings; ff/ff stops the process.
380 */
381static int ov7670_write_array(struct i2c_client *c, struct regval_list *vals)
382{
383 while (vals->reg_num != 0xff || vals->value != 0xff) {
384 int ret = ov7670_write(c, vals->reg_num, vals->value);
385 if (ret < 0)
386 return ret;
387 vals++;
388 }
389 return 0;
390}
391
392
393/*
394 * Stuff that knows about the sensor.
395 */
396static void ov7670_reset(struct i2c_client *client)
397{
398 ov7670_write(client, REG_COM7, COM7_RESET);
399 msleep(1);
400}
401
402
403static int ov7670_init(struct i2c_client *client)
404{
405 return ov7670_write_array(client, ov7670_default_regs);
406}
407
408
409
410static int ov7670_detect(struct i2c_client *client)
411{
412 unsigned char v;
413 int ret;
414
415 ret = ov7670_init(client);
416 if (ret < 0)
417 return ret;
418 ret = ov7670_read(client, REG_MIDH, &v);
419 if (ret < 0)
420 return ret;
421 if (v != 0x7f) /* OV manuf. id. */
422 return -ENODEV;
423 ret = ov7670_read(client, REG_MIDL, &v);
424 if (ret < 0)
425 return ret;
426 if (v != 0xa2)
427 return -ENODEV;
428 /*
429 * OK, we know we have an OmniVision chip...but which one?
430 */
431 ret = ov7670_read(client, REG_PID, &v);
432 if (ret < 0)
433 return ret;
434 if (v != 0x76) /* PID + VER = 0x76 / 0x73 */
435 return -ENODEV;
436 ret = ov7670_read(client, REG_VER, &v);
437 if (ret < 0)
438 return ret;
439 if (v != 0x73) /* PID + VER = 0x76 / 0x73 */
440 return -ENODEV;
441 return 0;
442}
443
444
445
446
447
448static struct ov7670_format_struct {
449 __u8 *desc;
450 __u32 pixelformat;
451 struct regval_list *regs;
452} ov7670_formats[] = {
453 {
454 .desc = "YUYV 4:2:2",
455 .pixelformat = V4L2_PIX_FMT_YUYV,
456 .regs = ov7670_fmt_yuv422,
457 },
458 {
459 .desc = "RGB 444",
460 .pixelformat = V4L2_PIX_FMT_RGB444,
461 .regs = ov7670_fmt_rgb444,
462 },
463 {
464 .desc = "RGB 565",
465 .pixelformat = V4L2_PIX_FMT_RGB565,
466 .regs = ov7670_fmt_rgb565,
467 },
468 /*
469 * Pretend we do RGB32. This is here on the assumption that the
470 * upper layer will reformat RGB444 appropriately.
471 *
472 * The entire purpose for this thing's existence is to enable easy
473 * display of RGB444 for debugging purposes. It will come out soon.
474 */
475 {
476 .desc = "RGB32 (faked)",
477 .pixelformat = V4L2_PIX_FMT_RGB32,
478 .regs = ov7670_fmt_rgb444,
479 },
480};
481#define N_OV7670_FMTS (sizeof(ov7670_formats)/sizeof(ov7670_formats[0]))
482
483/*
484 * All formats we support are 2 bytes/pixel.
485 */
486#define BYTES_PER_PIXEL 2
487
488/*
489 * Then there is the issue of window sizes. Try to capture the info here.
490 */
491static struct ov7670_win_size {
492 int width;
493 int height;
494 unsigned char com7_bit;
495 int hstart; /* Start/stop values for the camera. Note */
496 int hstop; /* that they do not always make complete */
497 int vstart; /* sense to humans, but evidently the sensor */
498 int vstop; /* will do the right thing... */
499/* h/vref stuff */
500} ov7670_win_sizes[] = {
501 /* VGA */
502 {
503 .width = VGA_WIDTH,
504 .height = VGA_HEIGHT,
505 .com7_bit = COM7_FMT_VGA,
506 .hstart = 158, /* These values from */
507 .hstop = 14, /* Omnivision */
508 .vstart = 10,
509 .vstop = 490,
510 },
511 /* CIF */
512 {
513 .width = CIF_WIDTH,
514 .height = CIF_HEIGHT,
515 .com7_bit = COM7_FMT_CIF,
516 .hstart = 170, /* Empirically determined */
517 .hstop = 90,
518 .vstart = 14,
519 .vstop = 494,
520 },
521 /* QVGA */
522 {
523 .width = QVGA_WIDTH,
524 .height = QVGA_HEIGHT,
525 .com7_bit = COM7_FMT_QVGA,
526 .hstart = 164, /* Empirically determined */
527 .hstop = 20,
528 .vstart = 14,
529 .vstop = 494,
530 },
531};
532
533#define N_WIN_SIZES (sizeof(ov7670_win_sizes)/sizeof(ov7670_win_sizes[0]))
534
535
536/*
537 * Store a set of start/stop values into the camera.
538 */
539static int ov7670_set_hw(struct i2c_client *client, int hstart, int hstop,
540 int vstart, int vstop)
541{
542 int ret;
543 unsigned char v;
544/*
545 * Horizontal: 11 bits, top 8 live in hstart and hstop. Bottom 3 of
546 * hstart are in href[2:0], bottom 3 of hstop in href[5:3]. There is
547 * a mystery "edge offset" value in the top two bits of href.
548 */
549 ret = ov7670_write(client, REG_HSTART, (hstart >> 3) & 0xff);
550 ret += ov7670_write(client, REG_HSTOP, (hstop >> 3) & 0xff);
551 ret += ov7670_read(client, REG_HREF, &v);
552 v = (v & 0xc0) | ((hstop & 0x7) << 3) | (hstart & 0x7);
553 msleep(10);
554 ret += ov7670_write(client, REG_HREF, v);
555/*
556 * Vertical: similar arrangement, but only 10 bits.
557 */
558 ret += ov7670_write(client, REG_VSTART, (vstart >> 2) & 0xff);
559 ret += ov7670_write(client, REG_VSTOP, (vstop >> 2) & 0xff);
560 ret += ov7670_read(client, REG_VREF, &v);
561 v = (v & 0xf0) | ((vstop & 0x3) << 2) | (vstart & 0x3);
562 msleep(10);
563 ret += ov7670_write(client, REG_VREF, v);
564 return ret;
565}
566
567
568static int ov7670_enum_fmt(struct i2c_client *c, struct v4l2_fmtdesc *fmt)
569{
570 struct ov7670_format_struct *ofmt;
571
572 if (fmt->index >= N_OV7670_FMTS)
573 return -EINVAL;
574
575 ofmt = ov7670_formats + fmt->index;
576 fmt->flags = 0;
577 strcpy(fmt->description, ofmt->desc);
578 fmt->pixelformat = ofmt->pixelformat;
579 return 0;
580}
581
582
583static int ov7670_try_fmt(struct i2c_client *c, struct v4l2_format *fmt,
584 struct ov7670_format_struct **ret_fmt,
585 struct ov7670_win_size **ret_wsize)
586{
587 int index;
588 struct ov7670_win_size *wsize;
589 struct v4l2_pix_format *pix = &fmt->fmt.pix;
590
591 for (index = 0; index < N_OV7670_FMTS; index++)
592 if (ov7670_formats[index].pixelformat == pix->pixelformat)
593 break;
594 if (index >= N_OV7670_FMTS)
595 return -EINVAL;
596 if (ret_fmt != NULL)
597 *ret_fmt = ov7670_formats + index;
598 /*
599 * Fields: the OV devices claim to be progressive.
600 */
601 if (pix->field == V4L2_FIELD_ANY)
602 pix->field = V4L2_FIELD_NONE;
603 else if (pix->field != V4L2_FIELD_NONE)
604 return -EINVAL;
605 /*
606 * Round requested image size down to the nearest
607 * we support, but not below the smallest.
608 */
609 for (wsize = ov7670_win_sizes; wsize < ov7670_win_sizes + N_WIN_SIZES;
610 wsize++)
611 if (pix->width >= wsize->width && pix->height >= wsize->height)
612 break;
613 if (wsize > ov7670_win_sizes + N_WIN_SIZES)
614 wsize--; /* Take the smallest one */
615 if (ret_wsize != NULL)
616 *ret_wsize = wsize;
617 /*
618 * Note the size we'll actually handle.
619 */
620 pix->width = wsize->width;
621 pix->height = wsize->height;
622 pix->bytesperline = pix->width*BYTES_PER_PIXEL;
623 if (pix->pixelformat == V4L2_PIX_FMT_RGB32)
624 pix->bytesperline *= 2;
625 pix->sizeimage = pix->height*pix->bytesperline;
626 return 0;
627
628}
629
630/*
631 * Set a format.
632 */
633static int ov7670_s_fmt(struct i2c_client *c, struct v4l2_format *fmt)
634{
635 int ret;
636 struct ov7670_format_struct *ovfmt;
637 struct ov7670_win_size *wsize;
638 unsigned char com7;
639
640 ret = ov7670_try_fmt(c, fmt, &ovfmt, &wsize);
641 if (ret)
642 return ret;
643 /*
644 * COM7 is a pain in the ass, it doesn't like to be read then
645 * quickly written afterward. But we have everything we need
646 * to set it absolutely here, as long as the format-specific
647 * register sets list it first.
648 */
649 com7 = ovfmt->regs[0].value;
650 com7 |= wsize->com7_bit;
651 ov7670_write(c, REG_COM7, com7);
652 /*
653 * Now write the rest of the array. Also store start/stops
654 */
655 ov7670_write_array(c, ovfmt->regs + 1);
656 ov7670_set_hw(c, wsize->hstart, wsize->hstop, wsize->vstart,
657 wsize->vstop);
658 return 0;
659}
660
661/*
662 * Code for dealing with controls.
663 */
664
665/*
666 * Some weird registers seem to store values in a sign/magnitude format!
667 */
668static unsigned char ov7670_sm_to_abs(unsigned char v)
669{
670 if ((v & 0x80) == 0)
671 return v + 128;
672 else
673 return 128 - (v & 0x7f);
674}
675
676
677static unsigned char ov7670_abs_to_sm(unsigned char v)
678{
679 if (v > 127)
680 return v & 0x7f;
681 else
682 return (128 - v) | 0x80;
683}
684
685static int ov7670_t_brightness(struct i2c_client *client, unsigned char value)
686{
687 unsigned char com8;
688 int ret;
689
690 ov7670_read(client, REG_COM8, &com8);
691 com8 &= ~COM8_AEC;
692 ov7670_write(client, REG_COM8, com8);
693 value = ov7670_abs_to_sm(value);
694 ret = ov7670_write(client, REG_BRIGHT, value);
695 return ret;
696}
697
698static int ov7670_q_brightness(struct i2c_client *client, unsigned char *value)
699{
700 int ret;
701 ret = ov7670_read(client, REG_BRIGHT, value);
702 *value = ov7670_sm_to_abs(*value);
703 return ret;
704}
705
706static int ov7670_t_contrast(struct i2c_client *client, unsigned char value)
707{
708 return ov7670_write(client, REG_CONTRAS, value);
709}
710
711static int ov7670_q_contrast(struct i2c_client *client, unsigned char *value)
712{
713 return ov7670_read(client, REG_CONTRAS, value);
714}
715
716static int ov7670_q_hflip(struct i2c_client *client, unsigned char *value)
717{
718 int ret;
719 unsigned char v;
720
721 ret = ov7670_read(client, REG_MVFP, &v);
722 *value = (v & MVFP_MIRROR) == MVFP_MIRROR;
723 return ret;
724}
725
726
727static int ov7670_t_hflip(struct i2c_client *client, unsigned char value)
728{
729 unsigned char v;
730 int ret;
731
732 ret = ov7670_read(client, REG_MVFP, &v);
733 if (value)
734 v |= MVFP_MIRROR;
735 else
736 v &= ~MVFP_MIRROR;
737 msleep(10); /* FIXME */
738 ret += ov7670_write(client, REG_MVFP, v);
739 return ret;
740}
741
742
743
744static int ov7670_q_vflip(struct i2c_client *client, unsigned char *value)
745{
746 int ret;
747 unsigned char v;
748
749 ret = ov7670_read(client, REG_MVFP, &v);
750 *value = (v & MVFP_FLIP) == MVFP_FLIP;
751 return ret;
752}
753
754
755static int ov7670_t_vflip(struct i2c_client *client, unsigned char value)
756{
757 unsigned char v;
758 int ret;
759
760 ret = ov7670_read(client, REG_MVFP, &v);
761 if (value)
762 v |= MVFP_FLIP;
763 else
764 v &= ~MVFP_FLIP;
765 msleep(10); /* FIXME */
766 ret += ov7670_write(client, REG_MVFP, v);
767 return ret;
768}
769
770
771static struct ov7670_control {
772 struct v4l2_queryctrl qc;
773 int (*query)(struct i2c_client *c, unsigned char *value);
774 int (*tweak)(struct i2c_client *c, unsigned char value);
775} ov7670_controls[] =
776{
777 {
778 .qc = {
779 .id = V4L2_CID_BRIGHTNESS,
780 .type = V4L2_CTRL_TYPE_INTEGER,
781 .name = "Brightness",
782 .minimum = 0,
783 .maximum = 255,
784 .step = 1,
785 .default_value = 0x80,
786 .flags = V4L2_CTRL_FLAG_SLIDER
787 },
788 .tweak = ov7670_t_brightness,
789 .query = ov7670_q_brightness,
790 },
791 {
792 .qc = {
793 .id = V4L2_CID_CONTRAST,
794 .type = V4L2_CTRL_TYPE_INTEGER,
795 .name = "Contrast",
796 .minimum = 0,
797 .maximum = 127,
798 .step = 1,
799 .default_value = 0x40, /* XXX ov7670 spec */
800 .flags = V4L2_CTRL_FLAG_SLIDER
801 },
802 .tweak = ov7670_t_contrast,
803 .query = ov7670_q_contrast,
804 },
805 {
806 .qc = {
807 .id = V4L2_CID_VFLIP,
808 .type = V4L2_CTRL_TYPE_BOOLEAN,
809 .name = "Vertical flip",
810 .minimum = 0,
811 .maximum = 1,
812 .step = 1,
813 .default_value = 0,
814 },
815 .tweak = ov7670_t_vflip,
816 .query = ov7670_q_vflip,
817 },
818 {
819 .qc = {
820 .id = V4L2_CID_HFLIP,
821 .type = V4L2_CTRL_TYPE_BOOLEAN,
822 .name = "Horizontal mirror",
823 .minimum = 0,
824 .maximum = 1,
825 .step = 1,
826 .default_value = 0,
827 },
828 .tweak = ov7670_t_hflip,
829 .query = ov7670_q_hflip,
830 },
831};
832#define N_CONTROLS (sizeof(ov7670_controls)/sizeof(ov7670_controls[0]))
833
834static struct ov7670_control *ov7670_find_control(__u32 id)
835{
836 int i;
837
838 for (i = 0; i < N_CONTROLS; i++)
839 if (ov7670_controls[i].qc.id == id)
840 return ov7670_controls + i;
841 return NULL;
842}
843
844
845static int ov7670_queryctrl(struct i2c_client *client,
846 struct v4l2_queryctrl *qc)
847{
848 struct ov7670_control *ctrl = ov7670_find_control(qc->id);
849
850 if (ctrl == NULL)
851 return -EINVAL;
852 *qc = ctrl->qc;
853 return 0;
854}
855
856static int ov7670_g_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
857{
858 struct ov7670_control *octrl = ov7670_find_control(ctrl->id);
859 int ret;
860 unsigned char v;
861
862 if (octrl == NULL)
863 return -EINVAL;
864 ret = octrl->query(client, &v);
865 if (ret >= 0) {
866 ctrl->value = v;
867 return 0;
868 }
869 return ret;
870}
871
872static int ov7670_s_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
873{
874 struct ov7670_control *octrl = ov7670_find_control(ctrl->id);
875
876 if (octrl == NULL)
877 return -EINVAL;
878 return octrl->tweak(client, ctrl->value);
879}
880
881
882
883
884
885
886
887/*
888 * Basic i2c stuff.
889 */
890static struct i2c_driver ov7670_driver;
891
892static int ov7670_attach(struct i2c_adapter *adapter)
893{
894 int ret;
895 struct i2c_client *client;
896
897 printk(KERN_ERR "ov7670 attach, id = %d\n", adapter->id);
898 /*
899 * For now: only deal with adapters we recognize.
900 */
901 if (adapter->id != I2C_HW_SMBUS_CAFE)
902 return -ENODEV;
903
904 printk(KERN_ERR "ov7670 accepting\n");
905 client = kzalloc(sizeof (struct i2c_client), GFP_KERNEL);
906 if (! client)
907 return -ENOMEM;
908 client->adapter = adapter;
909 client->addr = OV7670_I2C_ADDR;
910 client->driver = &ov7670_driver,
911 strcpy(client->name, "OV7670");
912 /* Do we need clientdata? */
913
914 /*
915 * Make sure it's an ov7670
916 */
917 ret = ov7670_detect(client);
918 printk(KERN_ERR "detect result is %d\n", ret);
919 if (ret)
920 goto out_free;
921 i2c_attach_client(client);
922 return 0;
923
924 out_free:
925 kfree(client);
926 return ret;
927}
928
929
930static int ov7670_detach(struct i2c_client *client)
931{
932 i2c_detach_client(client);
933 kfree(client);
934 return 0;
935}
936
937
938static int ov7670_command(struct i2c_client *client, unsigned int cmd,
939 void *arg)
940{
941 switch (cmd) {
942 case VIDIOC_INT_G_CHIP_IDENT:
943 * (enum v4l2_chip_ident *) arg = V4L2_IDENT_OV7670;
944 return 0;
945
946 case VIDIOC_INT_RESET:
947 ov7670_reset(client);
948 return 0;
949
950 case VIDIOC_INT_INIT:
951 return ov7670_init(client);
952
953 case VIDIOC_ENUM_FMT:
954 return ov7670_enum_fmt(client, (struct v4l2_fmtdesc *) arg);
955 case VIDIOC_TRY_FMT:
956 return ov7670_try_fmt(client, (struct v4l2_format *) arg, NULL, NULL);
957 case VIDIOC_S_FMT:
958 return ov7670_s_fmt(client, (struct v4l2_format *) arg);
959 case VIDIOC_QUERYCTRL:
960 return ov7670_queryctrl(client, (struct v4l2_queryctrl *) arg);
961 case VIDIOC_S_CTRL:
962 return ov7670_s_ctrl(client, (struct v4l2_control *) arg);
963 case VIDIOC_G_CTRL:
964 return ov7670_g_ctrl(client, (struct v4l2_control *) arg);
965 /* Todo:
966 g/s_parm
967 initialization
968 */
969 }
970 return -EINVAL;
971}
972
973
974
975static struct i2c_driver ov7670_driver = {
976 .driver = {
977 .name = "ov7670",
978 },
979 .id = I2C_DRIVERID_OV7670,
980 .class = I2C_CLASS_CAM_DIGITAL,
981 .attach_adapter = ov7670_attach,
982 .detach_client = ov7670_detach,
983 .command = ov7670_command,
984};
985
986
987/*
988 * Module initialization
989 */
990static int __init ov7670_mod_init(void)
991{
992 printk(KERN_NOTICE "OmniVision ov7670 sensor driver, at your service\n");
993 return i2c_add_driver(&ov7670_driver);
994}
995
996static void __exit ov7670_mod_exit(void)
997{
998 i2c_del_driver(&ov7670_driver);
999}
1000
1001module_init(ov7670_mod_init);
1002module_exit(ov7670_mod_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-25 06:26:04 -0500