diff options
Diffstat (limited to 'drivers/media/video/ov7670.c')
| -rw-r--r-- | drivers/media/video/ov7670.c | 1371 |
1 files changed, 0 insertions, 1371 deletions
diff --git a/drivers/media/video/ov7670.c b/drivers/media/video/ov7670.c deleted file mode 100644 index 05c14a29375..00000000000 --- a/drivers/media/video/ov7670.c +++ /dev/null @@ -1,1371 +0,0 @@ -/* - * A V4L2 driver for OmniVision OV7670 cameras. - * - * Copyright 2006 One Laptop Per Child Association, Inc. Written - * by Jonathan Corbet with substantial inspiration from Mark - * McClelland's ovcamchip code. - * - * Copyright 2006-7 Jonathan Corbet <corbet@lwn.net> - * - * This file may be distributed under the terms of the GNU General - * Public License, version 2. - */ -#include <linux/init.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <linux/delay.h> -#include <linux/videodev.h> -#include <media/v4l2-common.h> -#include <media/v4l2-chip-ident.h> -#include <linux/i2c.h> - - -MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>"); -MODULE_DESCRIPTION("A low-level driver for OmniVision ov7670 sensors"); -MODULE_LICENSE("GPL"); - -/* - * Basic window sizes. These probably belong somewhere more globally - * useful. - */ -#define VGA_WIDTH 640 -#define VGA_HEIGHT 480 -#define QVGA_WIDTH 320 -#define QVGA_HEIGHT 240 -#define CIF_WIDTH 352 -#define CIF_HEIGHT 288 -#define QCIF_WIDTH 176 -#define QCIF_HEIGHT 144 - -/* - * Our nominal (default) frame rate. - */ -#define OV7670_FRAME_RATE 30 - -/* - * The 7670 sits on i2c with ID 0x42 - */ -#define OV7670_I2C_ADDR 0x42 - -/* Registers */ -#define REG_GAIN 0x00 /* Gain lower 8 bits (rest in vref) */ -#define REG_BLUE 0x01 /* blue gain */ -#define REG_RED 0x02 /* red gain */ -#define REG_VREF 0x03 /* Pieces of GAIN, VSTART, VSTOP */ -#define REG_COM1 0x04 /* Control 1 */ -#define COM1_CCIR656 0x40 /* CCIR656 enable */ -#define REG_BAVE 0x05 /* U/B Average level */ -#define REG_GbAVE 0x06 /* Y/Gb Average level */ -#define REG_AECHH 0x07 /* AEC MS 5 bits */ -#define REG_RAVE 0x08 /* V/R Average level */ -#define REG_COM2 0x09 /* Control 2 */ -#define COM2_SSLEEP 0x10 /* Soft sleep mode */ -#define REG_PID 0x0a /* Product ID MSB */ -#define REG_VER 0x0b /* Product ID LSB */ -#define REG_COM3 0x0c /* Control 3 */ -#define COM3_SWAP 0x40 /* Byte swap */ -#define COM3_SCALEEN 0x08 /* Enable scaling */ -#define COM3_DCWEN 0x04 /* Enable downsamp/crop/window */ -#define REG_COM4 0x0d /* Control 4 */ -#define REG_COM5 0x0e /* All "reserved" */ -#define REG_COM6 0x0f /* Control 6 */ -#define REG_AECH 0x10 /* More bits of AEC value */ -#define REG_CLKRC 0x11 /* Clocl control */ -#define CLK_EXT 0x40 /* Use external clock directly */ -#define CLK_SCALE 0x3f /* Mask for internal clock scale */ -#define REG_COM7 0x12 /* Control 7 */ -#define COM7_RESET 0x80 /* Register reset */ -#define COM7_FMT_MASK 0x38 -#define COM7_FMT_VGA 0x00 -#define COM7_FMT_CIF 0x20 /* CIF format */ -#define COM7_FMT_QVGA 0x10 /* QVGA format */ -#define COM7_FMT_QCIF 0x08 /* QCIF format */ -#define COM7_RGB 0x04 /* bits 0 and 2 - RGB format */ -#define COM7_YUV 0x00 /* YUV */ -#define COM7_BAYER 0x01 /* Bayer format */ -#define COM7_PBAYER 0x05 /* "Processed bayer" */ -#define REG_COM8 0x13 /* Control 8 */ -#define COM8_FASTAEC 0x80 /* Enable fast AGC/AEC */ -#define COM8_AECSTEP 0x40 /* Unlimited AEC step size */ -#define COM8_BFILT 0x20 /* Band filter enable */ -#define COM8_AGC 0x04 /* Auto gain enable */ -#define COM8_AWB 0x02 /* White balance enable */ -#define COM8_AEC 0x01 /* Auto exposure enable */ -#define REG_COM9 0x14 /* Control 9 - gain ceiling */ -#define REG_COM10 0x15 /* Control 10 */ -#define COM10_HSYNC 0x40 /* HSYNC instead of HREF */ -#define COM10_PCLK_HB 0x20 /* Suppress PCLK on horiz blank */ -#define COM10_HREF_REV 0x08 /* Reverse HREF */ -#define COM10_VS_LEAD 0x04 /* VSYNC on clock leading edge */ -#define COM10_VS_NEG 0x02 /* VSYNC negative */ -#define COM10_HS_NEG 0x01 /* HSYNC negative */ -#define REG_HSTART 0x17 /* Horiz start high bits */ -#define REG_HSTOP 0x18 /* Horiz stop high bits */ -#define REG_VSTART 0x19 /* Vert start high bits */ -#define REG_VSTOP 0x1a /* Vert stop high bits */ -#define REG_PSHFT 0x1b /* Pixel delay after HREF */ -#define REG_MIDH 0x1c /* Manuf. ID high */ -#define REG_MIDL 0x1d /* Manuf. ID low */ -#define REG_MVFP 0x1e /* Mirror / vflip */ -#define MVFP_MIRROR 0x20 /* Mirror image */ -#define MVFP_FLIP 0x10 /* Vertical flip */ - -#define REG_AEW 0x24 /* AGC upper limit */ -#define REG_AEB 0x25 /* AGC lower limit */ -#define REG_VPT 0x26 /* AGC/AEC fast mode op region */ -#define REG_HSYST 0x30 /* HSYNC rising edge delay */ -#define REG_HSYEN 0x31 /* HSYNC falling edge delay */ -#define REG_HREF 0x32 /* HREF pieces */ -#define REG_TSLB 0x3a /* lots of stuff */ -#define TSLB_YLAST 0x04 /* UYVY or VYUY - see com13 */ -#define REG_COM11 0x3b /* Control 11 */ -#define COM11_NIGHT 0x80 /* NIght mode enable */ -#define COM11_NMFR 0x60 /* Two bit NM frame rate */ -#define COM11_HZAUTO 0x10 /* Auto detect 50/60 Hz */ -#define COM11_50HZ 0x08 /* Manual 50Hz select */ -#define COM11_EXP 0x02 -#define REG_COM12 0x3c /* Control 12 */ -#define COM12_HREF 0x80 /* HREF always */ -#define REG_COM13 0x3d /* Control 13 */ -#define COM13_GAMMA 0x80 /* Gamma enable */ -#define COM13_UVSAT 0x40 /* UV saturation auto adjustment */ -#define COM13_UVSWAP 0x01 /* V before U - w/TSLB */ -#define REG_COM14 0x3e /* Control 14 */ -#define COM14_DCWEN 0x10 /* DCW/PCLK-scale enable */ -#define REG_EDGE 0x3f /* Edge enhancement factor */ -#define REG_COM15 0x40 /* Control 15 */ -#define COM15_R10F0 0x00 /* Data range 10 to F0 */ -#define COM15_R01FE 0x80 /* 01 to FE */ -#define COM15_R00FF 0xc0 /* 00 to FF */ -#define COM15_RGB565 0x10 /* RGB565 output */ -#define COM15_RGB555 0x30 /* RGB555 output */ -#define REG_COM16 0x41 /* Control 16 */ -#define COM16_AWBGAIN 0x08 /* AWB gain enable */ -#define REG_COM17 0x42 /* Control 17 */ -#define COM17_AECWIN 0xc0 /* AEC window - must match COM4 */ -#define COM17_CBAR 0x08 /* DSP Color bar */ - -/* - * This matrix defines how the colors are generated, must be - * tweaked to adjust hue and saturation. - * - * Order: v-red, v-green, v-blue, u-red, u-green, u-blue - * - * They are nine-bit signed quantities, with the sign bit - * stored in 0x58. Sign for v-red is bit 0, and up from there. - */ -#define REG_CMATRIX_BASE 0x4f -#define CMATRIX_LEN 6 -#define REG_CMATRIX_SIGN 0x58 - - -#define REG_BRIGHT 0x55 /* Brightness */ -#define REG_CONTRAS 0x56 /* Contrast control */ - -#define REG_GFIX 0x69 /* Fix gain control */ - -#define REG_REG76 0x76 /* OV's name */ -#define R76_BLKPCOR 0x80 /* Black pixel correction enable */ -#define R76_WHTPCOR 0x40 /* White pixel correction enable */ - -#define REG_RGB444 0x8c /* RGB 444 control */ -#define R444_ENABLE 0x02 /* Turn on RGB444, overrides 5x5 */ -#define R444_RGBX 0x01 /* Empty nibble at end */ - -#define REG_HAECC1 0x9f /* Hist AEC/AGC control 1 */ -#define REG_HAECC2 0xa0 /* Hist AEC/AGC control 2 */ - -#define REG_BD50MAX 0xa5 /* 50hz banding step limit */ -#define REG_HAECC3 0xa6 /* Hist AEC/AGC control 3 */ -#define REG_HAECC4 0xa7 /* Hist AEC/AGC control 4 */ -#define REG_HAECC5 0xa8 /* Hist AEC/AGC control 5 */ -#define REG_HAECC6 0xa9 /* Hist AEC/AGC control 6 */ -#define REG_HAECC7 0xaa /* Hist AEC/AGC control 7 */ -#define REG_BD60MAX 0xab /* 60hz banding step limit */ - - -/* - * Information we maintain about a known sensor. - */ -struct ov7670_format_struct; /* coming later */ -struct ov7670_info { - struct ov7670_format_struct *fmt; /* Current format */ - unsigned char sat; /* Saturation value */ - int hue; /* Hue value */ -}; - - - - -/* - * The default register settings, as obtained from OmniVision. There - * is really no making sense of most of these - lots of "reserved" values - * and such. - * - * These settings give VGA YUYV. - */ - -struct regval_list { - unsigned char reg_num; - unsigned char value; -}; - -static struct regval_list ov7670_default_regs[] = { - { REG_COM7, COM7_RESET }, -/* - * Clock scale: 3 = 15fps - * 2 = 20fps - * 1 = 30fps - */ - { REG_CLKRC, 0x1 }, /* OV: clock scale (30 fps) */ - { REG_TSLB, 0x04 }, /* OV */ - { REG_COM7, 0 }, /* VGA */ - /* - * Set the hardware window. These values from OV don't entirely - * make sense - hstop is less than hstart. But they work... - */ - { REG_HSTART, 0x13 }, { REG_HSTOP, 0x01 }, - { REG_HREF, 0xb6 }, { REG_VSTART, 0x02 }, - { REG_VSTOP, 0x7a }, { REG_VREF, 0x0a }, - - { REG_COM3, 0 }, { REG_COM14, 0 }, - /* Mystery scaling numbers */ - { 0x70, 0x3a }, { 0x71, 0x35 }, - { 0x72, 0x11 }, { 0x73, 0xf0 }, - { 0xa2, 0x02 }, { REG_COM10, 0x0 }, - - /* Gamma curve values */ - { 0x7a, 0x20 }, { 0x7b, 0x10 }, - { 0x7c, 0x1e }, { 0x7d, 0x35 }, - { 0x7e, 0x5a }, { 0x7f, 0x69 }, - { 0x80, 0x76 }, { 0x81, 0x80 }, - { 0x82, 0x88 }, { 0x83, 0x8f }, - { 0x84, 0x96 }, { 0x85, 0xa3 }, - { 0x86, 0xaf }, { 0x87, 0xc4 }, - { 0x88, 0xd7 }, { 0x89, 0xe8 }, - - /* AGC and AEC parameters. Note we start by disabling those features, - then turn them only after tweaking the values. */ - { REG_COM8, COM8_FASTAEC | COM8_AECSTEP | COM8_BFILT }, - { REG_GAIN, 0 }, { REG_AECH, 0 }, - { REG_COM4, 0x40 }, /* magic reserved bit */ - { REG_COM9, 0x18 }, /* 4x gain + magic rsvd bit */ - { REG_BD50MAX, 0x05 }, { REG_BD60MAX, 0x07 }, - { REG_AEW, 0x95 }, { REG_AEB, 0x33 }, - { REG_VPT, 0xe3 }, { REG_HAECC1, 0x78 }, - { REG_HAECC2, 0x68 }, { 0xa1, 0x03 }, /* magic */ - { REG_HAECC3, 0xd8 }, { REG_HAECC4, 0xd8 }, - { REG_HAECC5, 0xf0 }, { REG_HAECC6, 0x90 }, - { REG_HAECC7, 0x94 }, - { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC }, - - /* Almost all of these are magic "reserved" values. */ - { REG_COM5, 0x61 }, { REG_COM6, 0x4b }, - { 0x16, 0x02 }, { REG_MVFP, 0x07 }, - { 0x21, 0x02 }, { 0x22, 0x91 }, - { 0x29, 0x07 }, { 0x33, 0x0b }, - { 0x35, 0x0b }, { 0x37, 0x1d }, - { 0x38, 0x71 }, { 0x39, 0x2a }, - { REG_COM12, 0x78 }, { 0x4d, 0x40 }, - { 0x4e, 0x20 }, { REG_GFIX, 0 }, - { 0x6b, 0x4a }, { 0x74, 0x10 }, - { 0x8d, 0x4f }, { 0x8e, 0 }, - { 0x8f, 0 }, { 0x90, 0 }, - { 0x91, 0 }, { 0x96, 0 }, - { 0x9a, 0 }, { 0xb0, 0x84 }, - { 0xb1, 0x0c }, { 0xb2, 0x0e }, - { 0xb3, 0x82 }, { 0xb8, 0x0a }, - - /* More reserved magic, some of which tweaks white balance */ - { 0x43, 0x0a }, { 0x44, 0xf0 }, - { 0x45, 0x34 }, { 0x46, 0x58 }, - { 0x47, 0x28 }, { 0x48, 0x3a }, - { 0x59, 0x88 }, { 0x5a, 0x88 }, - { 0x5b, 0x44 }, { 0x5c, 0x67 }, - { 0x5d, 0x49 }, { 0x5e, 0x0e }, - { 0x6c, 0x0a }, { 0x6d, 0x55 }, - { 0x6e, 0x11 }, { 0x6f, 0x9f }, /* "9e for advance AWB" */ - { 0x6a, 0x40 }, { REG_BLUE, 0x40 }, - { REG_RED, 0x60 }, - { REG_COM8, COM8_FASTAEC|COM8_AECSTEP|COM8_BFILT|COM8_AGC|COM8_AEC|COM8_AWB }, - - /* Matrix coefficients */ - { 0x4f, 0x80 }, { 0x50, 0x80 }, - { 0x51, 0 }, { 0x52, 0x22 }, - { 0x53, 0x5e }, { 0x54, 0x80 }, - { 0x58, 0x9e }, - - { REG_COM16, COM16_AWBGAIN }, { REG_EDGE, 0 }, - { 0x75, 0x05 }, { 0x76, 0xe1 }, - { 0x4c, 0 }, { 0x77, 0x01 }, - { REG_COM13, 0xc3 }, { 0x4b, 0x09 }, - { 0xc9, 0x60 }, { REG_COM16, 0x38 }, - { 0x56, 0x40 }, - - { 0x34, 0x11 }, { REG_COM11, COM11_EXP|COM11_HZAUTO }, - { 0xa4, 0x88 }, { 0x96, 0 }, - { 0x97, 0x30 }, { 0x98, 0x20 }, - { 0x99, 0x30 }, { 0x9a, 0x84 }, - { 0x9b, 0x29 }, { 0x9c, 0x03 }, - { 0x9d, 0x4c }, { 0x9e, 0x3f }, - { 0x78, 0x04 }, - - /* Extra-weird stuff. Some sort of multiplexor register */ - { 0x79, 0x01 }, { 0xc8, 0xf0 }, - { 0x79, 0x0f }, { 0xc8, 0x00 }, - { 0x79, 0x10 }, { 0xc8, 0x7e }, - { 0x79, 0x0a }, { 0xc8, 0x80 }, - { 0x79, 0x0b }, { 0xc8, 0x01 }, - { 0x79, 0x0c }, { 0xc8, 0x0f }, - { 0x79, 0x0d }, { 0xc8, 0x20 }, - { 0x79, 0x09 }, { 0xc8, 0x80 }, - { 0x79, 0x02 }, { 0xc8, 0xc0 }, - { 0x79, 0x03 }, { 0xc8, 0x40 }, - { 0x79, 0x05 }, { 0xc8, 0x30 }, - { 0x79, 0x26 }, - - { 0xff, 0xff }, /* END MARKER */ -}; - - -/* - * Here we'll try to encapsulate the changes for just the output - * video format. - * - * RGB656 and YUV422 come from OV; RGB444 is homebrewed. - * - * IMPORTANT RULE: the first entry must be for COM7, see ov7670_s_fmt for why. - */ - - -static struct regval_list ov7670_fmt_yuv422[] = { - { REG_COM7, 0x0 }, /* Selects YUV mode */ - { REG_RGB444, 0 }, /* No RGB444 please */ - { REG_COM1, 0 }, - { REG_COM15, COM15_R00FF }, - { REG_COM9, 0x18 }, /* 4x gain ceiling; 0x8 is reserved bit */ - { 0x4f, 0x80 }, /* "matrix coefficient 1" */ - { 0x50, 0x80 }, /* "matrix coefficient 2" */ - { 0x51, 0 }, /* vb */ - { 0x52, 0x22 }, /* "matrix coefficient 4" */ - { 0x53, 0x5e }, /* "matrix coefficient 5" */ - { 0x54, 0x80 }, /* "matrix coefficient 6" */ - { REG_COM13, COM13_GAMMA|COM13_UVSAT }, - { 0xff, 0xff }, -}; - -static struct regval_list ov7670_fmt_rgb565[] = { - { REG_COM7, COM7_RGB }, /* Selects RGB mode */ - { REG_RGB444, 0 }, /* No RGB444 please */ - { REG_COM1, 0x0 }, - { REG_COM15, COM15_RGB565 }, - { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */ - { 0x4f, 0xb3 }, /* "matrix coefficient 1" */ - { 0x50, 0xb3 }, /* "matrix coefficient 2" */ - { 0x51, 0 }, /* vb */ - { 0x52, 0x3d }, /* "matrix coefficient 4" */ - { 0x53, 0xa7 }, /* "matrix coefficient 5" */ - { 0x54, 0xe4 }, /* "matrix coefficient 6" */ - { REG_COM13, COM13_GAMMA|COM13_UVSAT }, - { 0xff, 0xff }, -}; - -static struct regval_list ov7670_fmt_rgb444[] = { - { REG_COM7, COM7_RGB }, /* Selects RGB mode */ - { REG_RGB444, R444_ENABLE }, /* Enable xxxxrrrr ggggbbbb */ - { REG_COM1, 0x40 }, /* Magic reserved bit */ - { REG_COM15, COM15_R01FE|COM15_RGB565 }, /* Data range needed? */ - { REG_COM9, 0x38 }, /* 16x gain ceiling; 0x8 is reserved bit */ - { 0x4f, 0xb3 }, /* "matrix coefficient 1" */ - { 0x50, 0xb3 }, /* "matrix coefficient 2" */ - { 0x51, 0 }, /* vb */ - { 0x52, 0x3d }, /* "matrix coefficient 4" */ - { 0x53, 0xa7 }, /* "matrix coefficient 5" */ - { 0x54, 0xe4 }, /* "matrix coefficient 6" */ - { REG_COM13, COM13_GAMMA|COM13_UVSAT|0x2 }, /* Magic rsvd bit */ - { 0xff, 0xff }, -}; - -static struct regval_list ov7670_fmt_raw[] = { - { REG_COM7, COM7_BAYER }, - { REG_COM13, 0x08 }, /* No gamma, magic rsvd bit */ - { REG_COM16, 0x3d }, /* Edge enhancement, denoise */ - { REG_REG76, 0xe1 }, /* Pix correction, magic rsvd */ - { 0xff, 0xff }, -}; - - - -/* - * Low-level register I/O. - */ - -static int ov7670_read(struct i2c_client *c, unsigned char reg, - unsigned char *value) -{ - int ret; - - ret = i2c_smbus_read_byte_data(c, reg); - if (ret >= 0) { - *value = (unsigned char) ret; - ret = 0; - } - return ret; -} - - -static int ov7670_write(struct i2c_client *c, unsigned char reg, - unsigned char value) -{ - int ret = i2c_smbus_write_byte_data(c, reg, value); - if (reg == REG_COM7 && (value & COM7_RESET)) - msleep(2); /* Wait for reset to run */ - return ret; -} - - -/* - * Write a list of register settings; ff/ff stops the process. - */ -static int ov7670_write_array(struct i2c_client *c, struct regval_list *vals) -{ - while (vals->reg_num != 0xff || vals->value != 0xff) { - int ret = ov7670_write(c, vals->reg_num, vals->value); - if (ret < 0) - return ret; - vals++; - } - return 0; -} - - -/* - * Stuff that knows about the sensor. - */ -static void ov7670_reset(struct i2c_client *client) -{ - ov7670_write(client, REG_COM7, COM7_RESET); - msleep(1); -} - - -static int ov7670_init(struct i2c_client *client) -{ - return ov7670_write_array(client, ov7670_default_regs); -} - - - -static int ov7670_detect(struct i2c_client *client) -{ - unsigned char v; - int ret; - - ret = ov7670_init(client); - if (ret < 0) - return ret; - ret = ov7670_read(client, REG_MIDH, &v); - if (ret < 0) - return ret; - if (v != 0x7f) /* OV manuf. id. */ - return -ENODEV; - ret = ov7670_read(client, REG_MIDL, &v); - if (ret < 0) - return ret; - if (v != 0xa2) - return -ENODEV; - /* - * OK, we know we have an OmniVision chip...but which one? - */ - ret = ov7670_read(client, REG_PID, &v); - if (ret < 0) - return ret; - if (v != 0x76) /* PID + VER = 0x76 / 0x73 */ - return -ENODEV; - ret = ov7670_read(client, REG_VER, &v); - if (ret < 0) - return ret; - if (v != 0x73) /* PID + VER = 0x76 / 0x73 */ - return -ENODEV; - return 0; -} - - -/* - * Store information about the video data format. The color matrix - * is deeply tied into the format, so keep the relevant values here. - * The magic matrix nubmers come from OmniVision. - */ -static struct ov7670_format_struct { - __u8 *desc; - __u32 pixelformat; - struct regval_list *regs; - int cmatrix[CMATRIX_LEN]; - int bpp; /* Bytes per pixel */ -} ov7670_formats[] = { - { - .desc = "YUYV 4:2:2", - .pixelformat = V4L2_PIX_FMT_YUYV, - .regs = ov7670_fmt_yuv422, - .cmatrix = { 128, -128, 0, -34, -94, 128 }, - .bpp = 2, - }, - { - .desc = "RGB 444", - .pixelformat = V4L2_PIX_FMT_RGB444, - .regs = ov7670_fmt_rgb444, - .cmatrix = { 179, -179, 0, -61, -176, 228 }, - .bpp = 2, - }, - { - .desc = "RGB 565", - .pixelformat = V4L2_PIX_FMT_RGB565, - .regs = ov7670_fmt_rgb565, - .cmatrix = { 179, -179, 0, -61, -176, 228 }, - .bpp = 2, - }, - { - .desc = "Raw RGB Bayer", - .pixelformat = V4L2_PIX_FMT_SBGGR8, - .regs = ov7670_fmt_raw, - .cmatrix = { 0, 0, 0, 0, 0, 0 }, - .bpp = 1 - }, -}; -#define N_OV7670_FMTS ARRAY_SIZE(ov7670_formats) - - -/* - * Then there is the issue of window sizes. Try to capture the info here. - */ - -/* - * QCIF mode is done (by OV) in a very strange way - it actually looks like - * VGA with weird scaling options - they do *not* use the canned QCIF mode - * which is allegedly provided by the sensor. So here's the weird register - * settings. - */ -static struct regval_list ov7670_qcif_regs[] = { - { REG_COM3, COM3_SCALEEN|COM3_DCWEN }, - { REG_COM3, COM3_DCWEN }, - { REG_COM14, COM14_DCWEN | 0x01}, - { 0x73, 0xf1 }, - { 0xa2, 0x52 }, - { 0x7b, 0x1c }, - { 0x7c, 0x28 }, - { 0x7d, 0x3c }, - { 0x7f, 0x69 }, - { REG_COM9, 0x38 }, - { 0xa1, 0x0b }, - { 0x74, 0x19 }, - { 0x9a, 0x80 }, - { 0x43, 0x14 }, - { REG_COM13, 0xc0 }, - { 0xff, 0xff }, -}; - -static struct ov7670_win_size { - int width; - int height; - unsigned char com7_bit; - int hstart; /* Start/stop values for the camera. Note */ - int hstop; /* that they do not always make complete */ - int vstart; /* sense to humans, but evidently the sensor */ - int vstop; /* will do the right thing... */ - struct regval_list *regs; /* Regs to tweak */ -/* h/vref stuff */ -} ov7670_win_sizes[] = { - /* VGA */ - { - .width = VGA_WIDTH, - .height = VGA_HEIGHT, - .com7_bit = COM7_FMT_VGA, - .hstart = 158, /* These values from */ - .hstop = 14, /* Omnivision */ - .vstart = 10, - .vstop = 490, - .regs = NULL, - }, - /* CIF */ - { - .width = CIF_WIDTH, - .height = CIF_HEIGHT, - .com7_bit = COM7_FMT_CIF, - .hstart = 170, /* Empirically determined */ - .hstop = 90, - .vstart = 14, - .vstop = 494, - .regs = NULL, - }, - /* QVGA */ - { - .width = QVGA_WIDTH, - .height = QVGA_HEIGHT, - .com7_bit = COM7_FMT_QVGA, - .hstart = 164, /* Empirically determined */ - .hstop = 20, - .vstart = 14, - .vstop = 494, - .regs = NULL, - }, - /* QCIF */ - { - .width = QCIF_WIDTH, - .height = QCIF_HEIGHT, - .com7_bit = COM7_FMT_VGA, /* see comment above */ - .hstart = 456, /* Empirically determined */ - .hstop = 24, - .vstart = 14, - .vstop = 494, - .regs = ov7670_qcif_regs, - }, -}; - -#define N_WIN_SIZES (ARRAY_SIZE(ov7670_win_sizes)) - - -/* - * Store a set of start/stop values into the camera. - */ -static int ov7670_set_hw(struct i2c_client *client, int hstart, int hstop, - int vstart, int vstop) -{ - int ret; - unsigned char v; -/* - * Horizontal: 11 bits, top 8 live in hstart and hstop. Bottom 3 of - * hstart are in href[2:0], bottom 3 of hstop in href[5:3]. There is - * a mystery "edge offset" value in the top two bits of href. - */ - ret = ov7670_write(client, REG_HSTART, (hstart >> 3) & 0xff); - ret += ov7670_write(client, REG_HSTOP, (hstop >> 3) & 0xff); - ret += ov7670_read(client, REG_HREF, &v); - v = (v & 0xc0) | ((hstop & 0x7) << 3) | (hstart & 0x7); - msleep(10); - ret += ov7670_write(client, REG_HREF, v); -/* - * Vertical: similar arrangement, but only 10 bits. - */ - ret += ov7670_write(client, REG_VSTART, (vstart >> 2) & 0xff); - ret += ov7670_write(client, REG_VSTOP, (vstop >> 2) & 0xff); - ret += ov7670_read(client, REG_VREF, &v); - v = (v & 0xf0) | ((vstop & 0x3) << 2) | (vstart & 0x3); - msleep(10); - ret += ov7670_write(client, REG_VREF, v); - return ret; -} - - -static int ov7670_enum_fmt(struct i2c_client *c, struct v4l2_fmtdesc *fmt) -{ - struct ov7670_format_struct *ofmt; - - if (fmt->index >= N_OV7670_FMTS) - return -EINVAL; - - ofmt = ov7670_formats + fmt->index; - fmt->flags = 0; - strcpy(fmt->description, ofmt->desc); - fmt->pixelformat = ofmt->pixelformat; - return 0; -} - - -static int ov7670_try_fmt(struct i2c_client *c, struct v4l2_format *fmt, - struct ov7670_format_struct **ret_fmt, - struct ov7670_win_size **ret_wsize) -{ - int index; - struct ov7670_win_size *wsize; - struct v4l2_pix_format *pix = &fmt->fmt.pix; - - for (index = 0; index < N_OV7670_FMTS; index++) - if (ov7670_formats[index].pixelformat == pix->pixelformat) - break; - if (index >= N_OV7670_FMTS) { - /* default to first format */ - index = 0; - pix->pixelformat = ov7670_formats[0].pixelformat; - } - if (ret_fmt != NULL) - *ret_fmt = ov7670_formats + index; - /* - * Fields: the OV devices claim to be progressive. - */ - pix->field = V4L2_FIELD_NONE; - /* - * Round requested image size down to the nearest - * we support, but not below the smallest. - */ - for (wsize = ov7670_win_sizes; wsize < ov7670_win_sizes + N_WIN_SIZES; - wsize++) - if (pix->width >= wsize->width && pix->height >= wsize->height) - break; - if (wsize >= ov7670_win_sizes + N_WIN_SIZES) - wsize--; /* Take the smallest one */ - if (ret_wsize != NULL) - *ret_wsize = wsize; - /* - * Note the size we'll actually handle. - */ - pix->width = wsize->width; - pix->height = wsize->height; - pix->bytesperline = pix->width*ov7670_formats[index].bpp; - pix->sizeimage = pix->height*pix->bytesperline; - return 0; -} - -/* - * Set a format. - */ -static int ov7670_s_fmt(struct i2c_client *c, struct v4l2_format *fmt) -{ - int ret; - struct ov7670_format_struct *ovfmt; - struct ov7670_win_size *wsize; - struct ov7670_info *info = i2c_get_clientdata(c); - unsigned char com7, clkrc; - - ret = ov7670_try_fmt(c, fmt, &ovfmt, &wsize); - if (ret) - return ret; - /* - * HACK: if we're running rgb565 we need to grab then rewrite - * CLKRC. If we're *not*, however, then rewriting clkrc hoses - * the colors. - */ - if (fmt->fmt.pix.pixelformat == V4L2_PIX_FMT_RGB565) { - ret = ov7670_read(c, REG_CLKRC, &clkrc); - if (ret) - return ret; - } - /* - * COM7 is a pain in the ass, it doesn't like to be read then - * quickly written afterward. But we have everything we need - * to set it absolutely here, as long as the format-specific - * register sets list it first. - */ - com7 = ovfmt->regs[0].value; - com7 |= wsize->com7_bit; - ov7670_write(c, REG_COM7, com7); - /* - * Now write the rest of the array. Also store start/stops - */ - ov7670_write_array(c, ovfmt->regs + 1); - ov7670_set_hw(c, wsize->hstart, wsize->hstop, wsize->vstart, - wsize->vstop); - ret = 0; - if (wsize->regs) - ret = ov7670_write_array(c, wsize->regs); - info->fmt = ovfmt; - - if (fmt->fmt.pix.pixelformat == V4L2_PIX_FMT_RGB565 && ret == 0) - ret = ov7670_write(c, REG_CLKRC, clkrc); - return ret; -} - -/* - * Implement G/S_PARM. There is a "high quality" mode we could try - * to do someday; for now, we just do the frame rate tweak. - */ -static int ov7670_g_parm(struct i2c_client *c, struct v4l2_streamparm *parms) -{ - struct v4l2_captureparm *cp = &parms->parm.capture; - unsigned char clkrc; - int ret; - - if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) - return -EINVAL; - ret = ov7670_read(c, REG_CLKRC, &clkrc); - if (ret < 0) - return ret; - memset(cp, 0, sizeof(struct v4l2_captureparm)); - cp->capability = V4L2_CAP_TIMEPERFRAME; - cp->timeperframe.numerator = 1; - cp->timeperframe.denominator = OV7670_FRAME_RATE; - if ((clkrc & CLK_EXT) == 0 && (clkrc & CLK_SCALE) > 1) - cp->timeperframe.denominator /= (clkrc & CLK_SCALE); - return 0; -} - -static int ov7670_s_parm(struct i2c_client *c, struct v4l2_streamparm *parms) -{ - struct v4l2_captureparm *cp = &parms->parm.capture; - struct v4l2_fract *tpf = &cp->timeperframe; - unsigned char clkrc; - int ret, div; - - if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) - return -EINVAL; - if (cp->extendedmode != 0) - return -EINVAL; - /* - * CLKRC has a reserved bit, so let's preserve it. - */ - ret = ov7670_read(c, REG_CLKRC, &clkrc); - if (ret < 0) - return ret; - if (tpf->numerator == 0 || tpf->denominator == 0) - div = 1; /* Reset to full rate */ - else - div = (tpf->numerator*OV7670_FRAME_RATE)/tpf->denominator; - if (div == 0) - div = 1; - else if (div > CLK_SCALE) - div = CLK_SCALE; - clkrc = (clkrc & 0x80) | div; - tpf->numerator = 1; - tpf->denominator = OV7670_FRAME_RATE/div; - return ov7670_write(c, REG_CLKRC, clkrc); -} - - - -/* - * Code for dealing with controls. - */ - - - - - -static int ov7670_store_cmatrix(struct i2c_client *client, - int matrix[CMATRIX_LEN]) -{ - int i, ret; - unsigned char signbits = 0; - - /* - * Weird crap seems to exist in the upper part of - * the sign bits register, so let's preserve it. - */ - ret = ov7670_read(client, REG_CMATRIX_SIGN, &signbits); - signbits &= 0xc0; - - for (i = 0; i < CMATRIX_LEN; i++) { - unsigned char raw; - - if (matrix[i] < 0) { - signbits |= (1 << i); - if (matrix[i] < -255) - raw = 0xff; - else - raw = (-1 * matrix[i]) & 0xff; - } - else { - if (matrix[i] > 255) - raw = 0xff; - else - raw = matrix[i] & 0xff; - } - ret += ov7670_write(client, REG_CMATRIX_BASE + i, raw); - } - ret += ov7670_write(client, REG_CMATRIX_SIGN, signbits); - return ret; -} - - -/* - * Hue also requires messing with the color matrix. It also requires - * trig functions, which tend not to be well supported in the kernel. - * So here is a simple table of sine values, 0-90 degrees, in steps - * of five degrees. Values are multiplied by 1000. - * - * The following naive approximate trig functions require an argument - * carefully limited to -180 <= theta <= 180. - */ -#define SIN_STEP 5 -static const int ov7670_sin_table[] = { - 0, 87, 173, 258, 342, 422, - 499, 573, 642, 707, 766, 819, - 866, 906, 939, 965, 984, 996, - 1000 -}; - -static int ov7670_sine(int theta) -{ - int chs = 1; - int sine; - - if (theta < 0) { - theta = -theta; - chs = -1; - } - if (theta <= 90) - sine = ov7670_sin_table[theta/SIN_STEP]; - else { - theta -= 90; - sine = 1000 - ov7670_sin_table[theta/SIN_STEP]; - } - return sine*chs; -} - -static int ov7670_cosine(int theta) -{ - theta = 90 - theta; - if (theta > 180) - theta -= 360; - else if (theta < -180) - theta += 360; - return ov7670_sine(theta); -} - - - - -static void ov7670_calc_cmatrix(struct ov7670_info *info, - int matrix[CMATRIX_LEN]) -{ - int i; - /* - * Apply the current saturation setting first. - */ - for (i = 0; i < CMATRIX_LEN; i++) - matrix[i] = (info->fmt->cmatrix[i]*info->sat) >> 7; - /* - * Then, if need be, rotate the hue value. - */ - if (info->hue != 0) { - int sinth, costh, tmpmatrix[CMATRIX_LEN]; - - memcpy(tmpmatrix, matrix, CMATRIX_LEN*sizeof(int)); - sinth = ov7670_sine(info->hue); - costh = ov7670_cosine(info->hue); - - matrix[0] = (matrix[3]*sinth + matrix[0]*costh)/1000; - matrix[1] = (matrix[4]*sinth + matrix[1]*costh)/1000; - matrix[2] = (matrix[5]*sinth + matrix[2]*costh)/1000; - matrix[3] = (matrix[3]*costh - matrix[0]*sinth)/1000; - matrix[4] = (matrix[4]*costh - matrix[1]*sinth)/1000; - matrix[5] = (matrix[5]*costh - matrix[2]*sinth)/1000; - } -} - - - -static int ov7670_t_sat(struct i2c_client *client, int value) -{ - struct ov7670_info *info = i2c_get_clientdata(client); - int matrix[CMATRIX_LEN]; - int ret; - - info->sat = value; - ov7670_calc_cmatrix(info, matrix); - ret = ov7670_store_cmatrix(client, matrix); - return ret; -} - -static int ov7670_q_sat(struct i2c_client *client, __s32 *value) -{ - struct ov7670_info *info = i2c_get_clientdata(client); - - *value = info->sat; - return 0; -} - -static int ov7670_t_hue(struct i2c_client *client, int value) -{ - struct ov7670_info *info = i2c_get_clientdata(client); - int matrix[CMATRIX_LEN]; - int ret; - - if (value < -180 || value > 180) - return -EINVAL; - info->hue = value; - ov7670_calc_cmatrix(info, matrix); - ret = ov7670_store_cmatrix(client, matrix); - return ret; -} - - -static int ov7670_q_hue(struct i2c_client *client, __s32 *value) -{ - struct ov7670_info *info = i2c_get_clientdata(client); - - *value = info->hue; - return 0; -} - - -/* - * Some weird registers seem to store values in a sign/magnitude format! - */ -static unsigned char ov7670_sm_to_abs(unsigned char v) -{ - if ((v & 0x80) == 0) - return v + 128; - else - return 128 - (v & 0x7f); -} - - -static unsigned char ov7670_abs_to_sm(unsigned char v) -{ - if (v > 127) - return v & 0x7f; - else - return (128 - v) | 0x80; -} - -static int ov7670_t_brightness(struct i2c_client *client, int value) -{ - unsigned char com8 = 0, v; - int ret; - - ov7670_read(client, REG_COM8, &com8); - com8 &= ~COM8_AEC; - ov7670_write(client, REG_COM8, com8); - v = ov7670_abs_to_sm(value); - ret = ov7670_write(client, REG_BRIGHT, v); - return ret; -} - -static int ov7670_q_brightness(struct i2c_client *client, __s32 *value) -{ - unsigned char v = 0; - int ret = ov7670_read(client, REG_BRIGHT, &v); - - *value = ov7670_sm_to_abs(v); - return ret; -} - -static int ov7670_t_contrast(struct i2c_client *client, int value) -{ - return ov7670_write(client, REG_CONTRAS, (unsigned char) value); -} - -static int ov7670_q_contrast(struct i2c_client *client, __s32 *value) -{ - unsigned char v = 0; - int ret = ov7670_read(client, REG_CONTRAS, &v); - - *value = v; - return ret; -} - -static int ov7670_q_hflip(struct i2c_client *client, __s32 *value) -{ - int ret; - unsigned char v = 0; - - ret = ov7670_read(client, REG_MVFP, &v); - *value = (v & MVFP_MIRROR) == MVFP_MIRROR; - return ret; -} - - -static int ov7670_t_hflip(struct i2c_client *client, int value) -{ - unsigned char v = 0; - int ret; - - ret = ov7670_read(client, REG_MVFP, &v); - if (value) - v |= MVFP_MIRROR; - else - v &= ~MVFP_MIRROR; - msleep(10); /* FIXME */ - ret += ov7670_write(client, REG_MVFP, v); - return ret; -} - - - -static int ov7670_q_vflip(struct i2c_client *client, __s32 *value) -{ - int ret; - unsigned char v = 0; - - ret = ov7670_read(client, REG_MVFP, &v); - *value = (v & MVFP_FLIP) == MVFP_FLIP; - return ret; -} - - -static int ov7670_t_vflip(struct i2c_client *client, int value) -{ - unsigned char v = 0; - int ret; - - ret = ov7670_read(client, REG_MVFP, &v); - if (value) - v |= MVFP_FLIP; - else - v &= ~MVFP_FLIP; - msleep(10); /* FIXME */ - ret += ov7670_write(client, REG_MVFP, v); - return ret; -} - - -static struct ov7670_control { - struct v4l2_queryctrl qc; - int (*query)(struct i2c_client *c, __s32 *value); - int (*tweak)(struct i2c_client *c, int value); -} ov7670_controls[] = -{ - { - .qc = { - .id = V4L2_CID_BRIGHTNESS, - .type = V4L2_CTRL_TYPE_INTEGER, - .name = "Brightness", - .minimum = 0, - .maximum = 255, - .step = 1, - .default_value = 0x80, - .flags = V4L2_CTRL_FLAG_SLIDER - }, - .tweak = ov7670_t_brightness, - .query = ov7670_q_brightness, - }, - { - .qc = { - .id = V4L2_CID_CONTRAST, - .type = V4L2_CTRL_TYPE_INTEGER, - .name = "Contrast", - .minimum = 0, - .maximum = 127, - .step = 1, - .default_value = 0x40, /* XXX ov7670 spec */ - .flags = V4L2_CTRL_FLAG_SLIDER - }, - .tweak = ov7670_t_contrast, - .query = ov7670_q_contrast, - }, - { - .qc = { - .id = V4L2_CID_SATURATION, - .type = V4L2_CTRL_TYPE_INTEGER, - .name = "Saturation", - .minimum = 0, - .maximum = 256, - .step = 1, - .default_value = 0x80, - .flags = V4L2_CTRL_FLAG_SLIDER - }, - .tweak = ov7670_t_sat, - .query = ov7670_q_sat, - }, - { - .qc = { - .id = V4L2_CID_HUE, - .type = V4L2_CTRL_TYPE_INTEGER, - .name = "HUE", - .minimum = -180, - .maximum = 180, - .step = 5, - .default_value = 0, - .flags = V4L2_CTRL_FLAG_SLIDER - }, - .tweak = ov7670_t_hue, - .query = ov7670_q_hue, - }, - { - .qc = { - .id = V4L2_CID_VFLIP, - .type = V4L2_CTRL_TYPE_BOOLEAN, - .name = "Vertical flip", - .minimum = 0, - .maximum = 1, - .step = 1, - .default_value = 0, - }, - .tweak = ov7670_t_vflip, - .query = ov7670_q_vflip, - }, - { - .qc = { - .id = V4L2_CID_HFLIP, - .type = V4L2_CTRL_TYPE_BOOLEAN, - .name = "Horizontal mirror", - .minimum = 0, - .maximum = 1, - .step = 1, - .default_value = 0, - }, - .tweak = ov7670_t_hflip, - .query = ov7670_q_hflip, - }, -}; -#define N_CONTROLS (ARRAY_SIZE(ov7670_controls)) - -static struct ov7670_control *ov7670_find_control(__u32 id) -{ - int i; - - for (i = 0; i < N_CONTROLS; i++) - if (ov7670_controls[i].qc.id == id) - return ov7670_controls + i; - return NULL; -} - - -static int ov7670_queryctrl(struct i2c_client *client, - struct v4l2_queryctrl *qc) -{ - struct ov7670_control *ctrl = ov7670_find_control(qc->id); - - if (ctrl == NULL) - return -EINVAL; - *qc = ctrl->qc; - return 0; -} - -static int ov7670_g_ctrl(struct i2c_client *client, struct v4l2_control *ctrl) -{ - struct ov7670_control *octrl = ov7670_find_control(ctrl->id); - int ret; - - if (octrl == NULL) - return -EINVAL; - ret = octrl->query(client, &ctrl->value); - if (ret >= 0) - return 0; - return ret; -} - -static int ov7670_s_ctrl(struct i2c_client *client, struct v4l2_control *ctrl) -{ - struct ov7670_control *octrl = ov7670_find_control(ctrl->id); - int ret; - - if (octrl == NULL) - return -EINVAL; - ret = octrl->tweak(client, ctrl->value); - if (ret >= 0) - return 0; - return ret; -} - - - - - - -/* - * Basic i2c stuff. - */ -static struct i2c_driver ov7670_driver; - -static int ov7670_attach(struct i2c_adapter *adapter) -{ - int ret; - struct i2c_client *client; - struct ov7670_info *info; - - /* - * For now: only deal with adapters we recognize. - */ - if (adapter->id != I2C_HW_SMBUS_CAFE) - return -ENODEV; - - client = kzalloc(sizeof (struct i2c_client), GFP_KERNEL); - if (! client) - return -ENOMEM; - client->adapter = adapter; - client->addr = OV7670_I2C_ADDR; - client->driver = &ov7670_driver, - strcpy(client->name, "OV7670"); - /* - * Set up our info structure. - */ - info = kzalloc(sizeof (struct ov7670_info), GFP_KERNEL); - if (! info) { - ret = -ENOMEM; - goto out_free; - } - info->fmt = &ov7670_formats[0]; - info->sat = 128; /* Review this */ - i2c_set_clientdata(client, info); - - /* - * Make sure it's an ov7670 - */ - ret = ov7670_detect(client); - if (ret) - goto out_free_info; - ret = i2c_attach_client(client); - if (ret) - goto out_free_info; - return 0; - - out_free_info: - kfree(info); - out_free: - kfree(client); - return ret; -} - - -static int ov7670_detach(struct i2c_client *client) -{ - i2c_detach_client(client); - kfree(i2c_get_clientdata(client)); - kfree(client); - return 0; -} - - -static int ov7670_command(struct i2c_client *client, unsigned int cmd, - void *arg) -{ - switch (cmd) { - case VIDIOC_DBG_G_CHIP_IDENT: - return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_OV7670, 0); - - case VIDIOC_INT_RESET: - ov7670_reset(client); - return 0; - - case VIDIOC_INT_INIT: - return ov7670_init(client); - - case VIDIOC_ENUM_FMT: - return ov7670_enum_fmt(client, (struct v4l2_fmtdesc *) arg); - case VIDIOC_TRY_FMT: - return ov7670_try_fmt(client, (struct v4l2_format *) arg, NULL, NULL); - case VIDIOC_S_FMT: - return ov7670_s_fmt(client, (struct v4l2_format *) arg); - case VIDIOC_QUERYCTRL: - return ov7670_queryctrl(client, (struct v4l2_queryctrl *) arg); - case VIDIOC_S_CTRL: - return ov7670_s_ctrl(client, (struct v4l2_control *) arg); - case VIDIOC_G_CTRL: - return ov7670_g_ctrl(client, (struct v4l2_control *) arg); - case VIDIOC_S_PARM: - return ov7670_s_parm(client, (struct v4l2_streamparm *) arg); - case VIDIOC_G_PARM: - return ov7670_g_parm(client, (struct v4l2_streamparm *) arg); - } - return -EINVAL; -} - - - -static struct i2c_driver ov7670_driver = { - .driver = { - .name = "ov7670", - }, - .id = I2C_DRIVERID_OV7670, - .attach_adapter = ov7670_attach, - .detach_client = ov7670_detach, - .command = ov7670_command, -}; - - -/* - * Module initialization - */ -static int __init ov7670_mod_init(void) -{ - printk(KERN_NOTICE "OmniVision ov7670 sensor driver, at your service\n"); - return i2c_add_driver(&ov7670_driver); -} - -static void __exit ov7670_mod_exit(void) -{ - i2c_del_driver(&ov7670_driver); -} - -module_init(ov7670_mod_init); -module_exit(ov7670_mod_exit); |