| /* |
| * 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. |
| * |
| * 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/moduleparam.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_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|MVFP_MIRROR }, |
| { 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 }, |
| }; |
| |
| |
| |
| |
| /* |
| * 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; |
| return ret; |
| } |
| |
| |
| static int ov7670_write(struct i2c_client *c, unsigned char reg, |
| unsigned char value) |
| { |
| return i2c_smbus_write_byte_data(c, reg, value); |
| } |
| |
| |
| /* |
| * 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]; |
| } ov7670_formats[] = { |
| { |
| .desc = "YUYV 4:2:2", |
| .pixelformat = V4L2_PIX_FMT_YUYV, |
| .regs = ov7670_fmt_yuv422, |
| .cmatrix = { 128, -128, 0, -34, -94, 128 }, |
| }, |
| { |
| .desc = "RGB 444", |
| .pixelformat = V4L2_PIX_FMT_RGB444, |
| .regs = ov7670_fmt_rgb444, |
| .cmatrix = { 179, -179, 0, -61, -176, 228 }, |
| }, |
| { |
| .desc = "RGB 565", |
| .pixelformat = V4L2_PIX_FMT_RGB565, |
| .regs = ov7670_fmt_rgb565, |
| .cmatrix = { 179, -179, 0, -61, -176, 228 }, |
| }, |
| }; |
| #define N_OV7670_FMTS (sizeof(ov7670_formats)/sizeof(ov7670_formats[0])) |
| |
| /* |
| * All formats we support are 2 bytes/pixel. |
| */ |
| #define BYTES_PER_PIXEL 2 |
| |
| /* |
| * 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 (sizeof(ov7670_win_sizes)/sizeof(ov7670_win_sizes[0])) |
| |
| |
| /* |
| * 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) |
| return -EINVAL; |
| if (ret_fmt != NULL) |
| *ret_fmt = ov7670_formats + index; |
| /* |
| * Fields: the OV devices claim to be progressive. |
| */ |
| if (pix->field == V4L2_FIELD_ANY) |
| pix->field = V4L2_FIELD_NONE; |
| else if (pix->field != V4L2_FIELD_NONE) |
| return -EINVAL; |
| /* |
| * 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*BYTES_PER_PIXEL; |
| 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; |
| |
| ret = ov7670_try_fmt(c, fmt, &ovfmt, &wsize); |
| 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; |
| return 0; |
| } |
| |
| /* |
| * 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; |
| |
| /* |
| * 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, 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; |
| 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; |
| 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; |
| |
| 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; |
| 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; |
| |
| 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; |
| 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 (sizeof(ov7670_controls)/sizeof(ov7670_controls[0])) |
| |
| 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; |
| i2c_attach_client(client); |
| 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_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, |
| .class = I2C_CLASS_CAM_DIGITAL, |
| .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); |