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linux-next/drivers/media/i2c/ov7670.c
Jacopo Mondi 01b8444828 media: v4l2: i2c: ov7670: Implement OF mbus configuration 
ov7670 driver supports two optional properties supplied through platform
data, but currently does not support any standard video interface
property.

Add support through OF parsing for 2 generic properties (vsync and hsync
polarities) and for one custom property already supported through
platform data to suppress pixel clock output during horizontal
blanking.

While at there, check return value of register writes in set_fmt
function and rationalize spacings.

Signal polarities and pixel clock blanking verified through scope and
image capture.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2018-02-23 03:05:51 -05:00

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51 KiB
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/*
* 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/clk.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/videodev2.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-mediabus.h>
#include <media/v4l2-image-sizes.h>
#include <media/i2c/ov7670.h>
MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
MODULE_DESCRIPTION("A low-level driver for OmniVision ov7670 sensors");
MODULE_LICENSE("GPL");
static bool debug;
module_param(debug, bool, 0644);
MODULE_PARM_DESC(debug, "Debug level (0-1)");
/*
* The 7670 sits on i2c with ID 0x42
*/
#define OV7670_I2C_ADDR 0x42
#define PLL_FACTOR 4
/* 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_DBLV 0x6b /* PLL control an debugging */
#define DBLV_BYPASS 0x00 /* Bypass PLL */
#define DBLV_X4 0x01 /* clock x4 */
#define DBLV_X6 0x10 /* clock x6 */
#define DBLV_X8 0x11 /* clock x8 */
#define REG_SCALING_XSC 0x70 /* Test pattern and horizontal scale factor */
#define TEST_PATTTERN_0 0x80
#define REG_SCALING_YSC 0x71 /* Test pattern and vertical scale factor */
#define TEST_PATTTERN_1 0x80
#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 */
enum ov7670_model {
MODEL_OV7670 = 0,
MODEL_OV7675,
};
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 */
};
struct ov7670_devtype {
/* formats supported for each model */
struct ov7670_win_size *win_sizes;
unsigned int n_win_sizes;
/* callbacks for frame rate control */
int (*set_framerate)(struct v4l2_subdev *, struct v4l2_fract *);
void (*get_framerate)(struct v4l2_subdev *, struct v4l2_fract *);
};
/*
* Information we maintain about a known sensor.
*/
struct ov7670_format_struct; /* coming later */
struct ov7670_info {
struct v4l2_subdev sd;
#if defined(CONFIG_MEDIA_CONTROLLER)
struct media_pad pad;
#endif
struct v4l2_ctrl_handler hdl;
struct {
/* gain cluster */
struct v4l2_ctrl *auto_gain;
struct v4l2_ctrl *gain;
};
struct {
/* exposure cluster */
struct v4l2_ctrl *auto_exposure;
struct v4l2_ctrl *exposure;
};
struct {
/* saturation/hue cluster */
struct v4l2_ctrl *saturation;
struct v4l2_ctrl *hue;
};
struct v4l2_mbus_framefmt format;
struct ov7670_format_struct *fmt; /* Current format */
struct clk *clk;
struct gpio_desc *resetb_gpio;
struct gpio_desc *pwdn_gpio;
unsigned int mbus_config; /* Media bus configuration flags */
int min_width; /* Filter out smaller sizes */
int min_height; /* Filter out smaller sizes */
int clock_speed; /* External clock speed (MHz) */
u8 clkrc; /* Clock divider value */
bool use_smbus; /* Use smbus I/O instead of I2C */
bool pll_bypass;
bool pclk_hb_disable;
const struct ov7670_devtype *devtype; /* Device specifics */
};
static inline struct ov7670_info *to_state(struct v4l2_subdev *sd)
{
return container_of(sd, struct ov7670_info, sd);
}
static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
{
return &container_of(ctrl->handler, struct ov7670_info, hdl)->sd;
}
/*
* 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 */
{ REG_SCALING_XSC, 0x3a },
{ REG_SCALING_YSC, 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 }, /* CCIR601 */
{ REG_COM15, COM15_R00FF },
{ REG_COM9, 0x48 }, /* 32x 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 }, /* CCIR601 */
{ 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, 0x0 }, /* CCIR601 */
{ 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.
*
* Note that there are two versions of these. On the XO 1, the
* i2c controller only does SMBUS, so that's what we use. The
* ov7670 is not really an SMBUS device, though, so the communication
* is not always entirely reliable.
*/
static int ov7670_read_smbus(struct v4l2_subdev *sd, unsigned char reg,
unsigned char *value)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
int ret;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret >= 0) {
*value = (unsigned char)ret;
ret = 0;
}
return ret;
}
static int ov7670_write_smbus(struct v4l2_subdev *sd, unsigned char reg,
unsigned char value)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
int ret = i2c_smbus_write_byte_data(client, reg, value);
if (reg == REG_COM7 && (value & COM7_RESET))
msleep(5); /* Wait for reset to run */
return ret;
}
/*
* On most platforms, we'd rather do straight i2c I/O.
*/
static int ov7670_read_i2c(struct v4l2_subdev *sd, unsigned char reg,
unsigned char *value)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
u8 data = reg;
struct i2c_msg msg;
int ret;
/*
* Send out the register address...
*/
msg.addr = client->addr;
msg.flags = 0;
msg.len = 1;
msg.buf = &data;
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret < 0) {
printk(KERN_ERR "Error %d on register write\n", ret);
return ret;
}
/*
* ...then read back the result.
*/
msg.flags = I2C_M_RD;
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret >= 0) {
*value = data;
ret = 0;
}
return ret;
}
static int ov7670_write_i2c(struct v4l2_subdev *sd, unsigned char reg,
unsigned char value)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct i2c_msg msg;
unsigned char data[2] = { reg, value };
int ret;
msg.addr = client->addr;
msg.flags = 0;
msg.len = 2;
msg.buf = data;
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret > 0)
ret = 0;
if (reg == REG_COM7 && (value & COM7_RESET))
msleep(5); /* Wait for reset to run */
return ret;
}
static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
unsigned char *value)
{
struct ov7670_info *info = to_state(sd);
if (info->use_smbus)
return ov7670_read_smbus(sd, reg, value);
else
return ov7670_read_i2c(sd, reg, value);
}
static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
unsigned char value)
{
struct ov7670_info *info = to_state(sd);
if (info->use_smbus)
return ov7670_write_smbus(sd, reg, value);
else
return ov7670_write_i2c(sd, reg, value);
}
static int ov7670_update_bits(struct v4l2_subdev *sd, unsigned char reg,
unsigned char mask, unsigned char value)
{
unsigned char orig;
int ret;
ret = ov7670_read(sd, reg, &orig);
if (ret)
return ret;
return ov7670_write(sd, reg, (orig & ~mask) | (value & mask));
}
/*
* Write a list of register settings; ff/ff stops the process.
*/
static int ov7670_write_array(struct v4l2_subdev *sd, struct regval_list *vals)
{
while (vals->reg_num != 0xff || vals->value != 0xff) {
int ret = ov7670_write(sd, vals->reg_num, vals->value);
if (ret < 0)
return ret;
vals++;
}
return 0;
}
/*
* Stuff that knows about the sensor.
*/
static int ov7670_reset(struct v4l2_subdev *sd, u32 val)
{
ov7670_write(sd, REG_COM7, COM7_RESET);
msleep(1);
return 0;
}
static int ov7670_init(struct v4l2_subdev *sd, u32 val)
{
return ov7670_write_array(sd, ov7670_default_regs);
}
static int ov7670_detect(struct v4l2_subdev *sd)
{
unsigned char v;
int ret;
ret = ov7670_init(sd, 0);
if (ret < 0)
return ret;
ret = ov7670_read(sd, REG_MIDH, &v);
if (ret < 0)
return ret;
if (v != 0x7f) /* OV manuf. id. */
return -ENODEV;
ret = ov7670_read(sd, 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(sd, REG_PID, &v);
if (ret < 0)
return ret;
if (v != 0x76) /* PID + VER = 0x76 / 0x73 */
return -ENODEV;
ret = ov7670_read(sd, 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 numbers come from OmniVision.
*/
static struct ov7670_format_struct {
u32 mbus_code;
enum v4l2_colorspace colorspace;
struct regval_list *regs;
int cmatrix[CMATRIX_LEN];
} ov7670_formats[] = {
{
.mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
.colorspace = V4L2_COLORSPACE_SRGB,
.regs = ov7670_fmt_yuv422,
.cmatrix = { 128, -128, 0, -34, -94, 128 },
},
{
.mbus_code = MEDIA_BUS_FMT_RGB444_2X8_PADHI_LE,
.colorspace = V4L2_COLORSPACE_SRGB,
.regs = ov7670_fmt_rgb444,
.cmatrix = { 179, -179, 0, -61, -176, 228 },
},
{
.mbus_code = MEDIA_BUS_FMT_RGB565_2X8_LE,
.colorspace = V4L2_COLORSPACE_SRGB,
.regs = ov7670_fmt_rgb565,
.cmatrix = { 179, -179, 0, -61, -176, 228 },
},
{
.mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8,
.colorspace = V4L2_COLORSPACE_SRGB,
.regs = ov7670_fmt_raw,
.cmatrix = { 0, 0, 0, 0, 0, 0 },
},
};
#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 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 = 168, /* Empirically determined */
.hstop = 24,
.vstart = 12,
.vstop = 492,
.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,
}
};
static struct ov7670_win_size ov7675_win_sizes[] = {
/*
* Currently, only VGA is supported. Theoretically it could be possible
* to support CIF, QVGA and QCIF too. Taking values for ov7670 as a
* base and tweak them empirically could be required.
*/
{
.width = VGA_WIDTH,
.height = VGA_HEIGHT,
.com7_bit = COM7_FMT_VGA,
.hstart = 158, /* These values from */
.hstop = 14, /* Omnivision */
.vstart = 14, /* Empirically determined */
.vstop = 494,
.regs = NULL,
}
};
static void ov7675_get_framerate(struct v4l2_subdev *sd,
struct v4l2_fract *tpf)
{
struct ov7670_info *info = to_state(sd);
u32 clkrc = info->clkrc;
int pll_factor;
if (info->pll_bypass)
pll_factor = 1;
else
pll_factor = PLL_FACTOR;
clkrc++;
if (info->fmt->mbus_code == MEDIA_BUS_FMT_SBGGR8_1X8)
clkrc = (clkrc >> 1);
tpf->numerator = 1;
tpf->denominator = (5 * pll_factor * info->clock_speed) /
(4 * clkrc);
}
static int ov7675_set_framerate(struct v4l2_subdev *sd,
struct v4l2_fract *tpf)
{
struct ov7670_info *info = to_state(sd);
u32 clkrc;
int pll_factor;
int ret;
/*
* The formula is fps = 5/4*pixclk for YUV/RGB and
* fps = 5/2*pixclk for RAW.
*
* pixclk = clock_speed / (clkrc + 1) * PLLfactor
*
*/
if (info->pll_bypass) {
pll_factor = 1;
ret = ov7670_write(sd, REG_DBLV, DBLV_BYPASS);
} else {
pll_factor = PLL_FACTOR;
ret = ov7670_write(sd, REG_DBLV, DBLV_X4);
}
if (ret < 0)
return ret;
if (tpf->numerator == 0 || tpf->denominator == 0) {
clkrc = 0;
} else {
clkrc = (5 * pll_factor * info->clock_speed * tpf->numerator) /
(4 * tpf->denominator);
if (info->fmt->mbus_code == MEDIA_BUS_FMT_SBGGR8_1X8)
clkrc = (clkrc << 1);
clkrc--;
}
/*
* The datasheet claims that clkrc = 0 will divide the input clock by 1
* but we've checked with an oscilloscope that it divides by 2 instead.
* So, if clkrc = 0 just bypass the divider.
*/
if (clkrc <= 0)
clkrc = CLK_EXT;
else if (clkrc > CLK_SCALE)
clkrc = CLK_SCALE;
info->clkrc = clkrc;
/* Recalculate frame rate */
ov7675_get_framerate(sd, tpf);
ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
if (ret < 0)
return ret;
return ov7670_write(sd, REG_DBLV, DBLV_X4);
}
static void ov7670_get_framerate_legacy(struct v4l2_subdev *sd,
struct v4l2_fract *tpf)
{
struct ov7670_info *info = to_state(sd);
tpf->numerator = 1;
tpf->denominator = info->clock_speed;
if ((info->clkrc & CLK_EXT) == 0 && (info->clkrc & CLK_SCALE) > 1)
tpf->denominator /= (info->clkrc & CLK_SCALE);
}
static int ov7670_set_framerate_legacy(struct v4l2_subdev *sd,
struct v4l2_fract *tpf)
{
struct ov7670_info *info = to_state(sd);
int div;
if (tpf->numerator == 0 || tpf->denominator == 0)
div = 1; /* Reset to full rate */
else
div = (tpf->numerator * info->clock_speed) / tpf->denominator;
if (div == 0)
div = 1;
else if (div > CLK_SCALE)
div = CLK_SCALE;
info->clkrc = (info->clkrc & 0x80) | div;
tpf->numerator = 1;
tpf->denominator = info->clock_speed / div;
return ov7670_write(sd, REG_CLKRC, info->clkrc);
}
/*
* Store a set of start/stop values into the camera.
*/
static int ov7670_set_hw(struct v4l2_subdev *sd, 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(sd, REG_HSTART, (hstart >> 3) & 0xff);
ret += ov7670_write(sd, REG_HSTOP, (hstop >> 3) & 0xff);
ret += ov7670_read(sd, REG_HREF, &v);
v = (v & 0xc0) | ((hstop & 0x7) << 3) | (hstart & 0x7);
msleep(10);
ret += ov7670_write(sd, REG_HREF, v);
/*
* Vertical: similar arrangement, but only 10 bits.
*/
ret += ov7670_write(sd, REG_VSTART, (vstart >> 2) & 0xff);
ret += ov7670_write(sd, REG_VSTOP, (vstop >> 2) & 0xff);
ret += ov7670_read(sd, REG_VREF, &v);
v = (v & 0xf0) | ((vstop & 0x3) << 2) | (vstart & 0x3);
msleep(10);
ret += ov7670_write(sd, REG_VREF, v);
return ret;
}
static int ov7670_enum_mbus_code(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_mbus_code_enum *code)
{
if (code->pad || code->index >= N_OV7670_FMTS)
return -EINVAL;
code->code = ov7670_formats[code->index].mbus_code;
return 0;
}
static int ov7670_try_fmt_internal(struct v4l2_subdev *sd,
struct v4l2_mbus_framefmt *fmt,
struct ov7670_format_struct **ret_fmt,
struct ov7670_win_size **ret_wsize)
{
int index, i;
struct ov7670_win_size *wsize;
struct ov7670_info *info = to_state(sd);
unsigned int n_win_sizes = info->devtype->n_win_sizes;
unsigned int win_sizes_limit = n_win_sizes;
for (index = 0; index < N_OV7670_FMTS; index++)
if (ov7670_formats[index].mbus_code == fmt->code)
break;
if (index >= N_OV7670_FMTS) {
/* default to first format */
index = 0;
fmt->code = ov7670_formats[0].mbus_code;
}
if (ret_fmt != NULL)
*ret_fmt = ov7670_formats + index;
/*
* Fields: the OV devices claim to be progressive.
*/
fmt->field = V4L2_FIELD_NONE;
/*
* Don't consider values that don't match min_height and min_width
* constraints.
*/
if (info->min_width || info->min_height)
for (i = 0; i < n_win_sizes; i++) {
wsize = info->devtype->win_sizes + i;
if (wsize->width < info->min_width ||
wsize->height < info->min_height) {
win_sizes_limit = i;
break;
}
}
/*
* Round requested image size down to the nearest
* we support, but not below the smallest.
*/
for (wsize = info->devtype->win_sizes;
wsize < info->devtype->win_sizes + win_sizes_limit; wsize++)
if (fmt->width >= wsize->width && fmt->height >= wsize->height)
break;
if (wsize >= info->devtype->win_sizes + win_sizes_limit)
wsize--; /* Take the smallest one */
if (ret_wsize != NULL)
*ret_wsize = wsize;
/*
* Note the size we'll actually handle.
*/
fmt->width = wsize->width;
fmt->height = wsize->height;
fmt->colorspace = ov7670_formats[index].colorspace;
info->format = *fmt;
return 0;
}
/*
* Set a format.
*/
static int ov7670_set_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *format)
{
struct ov7670_format_struct *ovfmt;
struct ov7670_win_size *wsize;
struct ov7670_info *info = to_state(sd);
#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
struct v4l2_mbus_framefmt *mbus_fmt;
#endif
unsigned char com7, com10 = 0;
int ret;
if (format->pad)
return -EINVAL;
if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
ret = ov7670_try_fmt_internal(sd, &format->format, NULL, NULL);
if (ret)
return ret;
#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
mbus_fmt = v4l2_subdev_get_try_format(sd, cfg, format->pad);
*mbus_fmt = format->format;
return 0;
#else
return -ENOTTY;
#endif
}
ret = ov7670_try_fmt_internal(sd, &format->format, &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;
ret = ov7670_write(sd, REG_COM7, com7);
if (ret)
return ret;
/*
* Configure the media bus through COM10 register
*/
if (info->mbus_config & V4L2_MBUS_VSYNC_ACTIVE_LOW)
com10 |= COM10_VS_NEG;
if (info->mbus_config & V4L2_MBUS_HSYNC_ACTIVE_LOW)
com10 |= COM10_HREF_REV;
if (info->pclk_hb_disable)
com10 |= COM10_PCLK_HB;
ret = ov7670_write(sd, REG_COM10, com10);
if (ret)
return ret;
/*
* Now write the rest of the array. Also store start/stops
*/
ret = ov7670_write_array(sd, ovfmt->regs + 1);
if (ret)
return ret;
ret = ov7670_set_hw(sd, wsize->hstart, wsize->hstop, wsize->vstart,
wsize->vstop);
if (ret)
return ret;
if (wsize->regs) {
ret = ov7670_write_array(sd, wsize->regs);
if (ret)
return ret;
}
info->fmt = ovfmt;
/*
* If we're running RGB565, we must rewrite clkrc after setting
* the other parameters or the image looks poor. If we're *not*
* doing RGB565, we must not rewrite clkrc or the image looks
* *really* poor.
*
* (Update) Now that we retain clkrc state, we should be able
* to write it unconditionally, and that will make the frame
* rate persistent too.
*/
ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
if (ret)
return ret;
return 0;
}
static int ov7670_get_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *format)
{
struct ov7670_info *info = to_state(sd);
#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
struct v4l2_mbus_framefmt *mbus_fmt;
#endif
if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
mbus_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
format->format = *mbus_fmt;
return 0;
#else
return -ENOTTY;
#endif
} else {
format->format = info->format;
}
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_frame_interval(struct v4l2_subdev *sd,
struct v4l2_subdev_frame_interval *ival)
{
struct ov7670_info *info = to_state(sd);
info->devtype->get_framerate(sd, &ival->interval);
return 0;
}
static int ov7670_s_frame_interval(struct v4l2_subdev *sd,
struct v4l2_subdev_frame_interval *ival)
{
struct v4l2_fract *tpf = &ival->interval;
struct ov7670_info *info = to_state(sd);
return info->devtype->set_framerate(sd, tpf);
}
/*
* Frame intervals. Since frame rates are controlled with the clock
* divider, we can only do 30/n for integer n values. So no continuous
* or stepwise options. Here we just pick a handful of logical values.
*/
static int ov7670_frame_rates[] = { 30, 15, 10, 5, 1 };
static int ov7670_enum_frame_interval(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_frame_interval_enum *fie)
{
struct ov7670_info *info = to_state(sd);
unsigned int n_win_sizes = info->devtype->n_win_sizes;
int i;
if (fie->pad)
return -EINVAL;
if (fie->index >= ARRAY_SIZE(ov7670_frame_rates))
return -EINVAL;
/*
* Check if the width/height is valid.
*
* If a minimum width/height was requested, filter out the capture
* windows that fall outside that.
*/
for (i = 0; i < n_win_sizes; i++) {
struct ov7670_win_size *win = &info->devtype->win_sizes[i];
if (info->min_width && win->width < info->min_width)
continue;
if (info->min_height && win->height < info->min_height)
continue;
if (fie->width == win->width && fie->height == win->height)
break;
}
if (i == n_win_sizes)
return -EINVAL;
fie->interval.numerator = 1;
fie->interval.denominator = ov7670_frame_rates[fie->index];
return 0;
}
/*
* Frame size enumeration
*/
static int ov7670_enum_frame_size(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_frame_size_enum *fse)
{
struct ov7670_info *info = to_state(sd);
int i;
int num_valid = -1;
__u32 index = fse->index;
unsigned int n_win_sizes = info->devtype->n_win_sizes;
if (fse->pad)
return -EINVAL;
/*
* If a minimum width/height was requested, filter out the capture
* windows that fall outside that.
*/
for (i = 0; i < n_win_sizes; i++) {
struct ov7670_win_size *win = &info->devtype->win_sizes[i];
if (info->min_width && win->width < info->min_width)
continue;
if (info->min_height && win->height < info->min_height)
continue;
if (index == ++num_valid) {
fse->min_width = fse->max_width = win->width;
fse->min_height = fse->max_height = win->height;
return 0;
}
}
return -EINVAL;
}
/*
* Code for dealing with controls.
*/
static int ov7670_store_cmatrix(struct v4l2_subdev *sd,
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(sd, 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(sd, REG_CMATRIX_BASE + i, raw);
}
ret += ov7670_write(sd, 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 sat, int hue)
{
int i;
/*
* Apply the current saturation setting first.
*/
for (i = 0; i < CMATRIX_LEN; i++)
matrix[i] = (info->fmt->cmatrix[i] * sat) >> 7;
/*
* Then, if need be, rotate the hue value.
*/
if (hue != 0) {
int sinth, costh, tmpmatrix[CMATRIX_LEN];
memcpy(tmpmatrix, matrix, CMATRIX_LEN*sizeof(int));
sinth = ov7670_sine(hue);
costh = ov7670_cosine(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_s_sat_hue(struct v4l2_subdev *sd, int sat, int hue)
{
struct ov7670_info *info = to_state(sd);
int matrix[CMATRIX_LEN];
int ret;
ov7670_calc_cmatrix(info, matrix, sat, hue);
ret = ov7670_store_cmatrix(sd, matrix);
return ret;
}
/*
* Some weird registers seem to store values in a sign/magnitude format!
*/
static unsigned char ov7670_abs_to_sm(unsigned char v)
{
if (v > 127)
return v & 0x7f;
return (128 - v) | 0x80;
}
static int ov7670_s_brightness(struct v4l2_subdev *sd, int value)
{
unsigned char com8 = 0, v;
int ret;
ov7670_read(sd, REG_COM8, &com8);
com8 &= ~COM8_AEC;
ov7670_write(sd, REG_COM8, com8);
v = ov7670_abs_to_sm(value);
ret = ov7670_write(sd, REG_BRIGHT, v);
return ret;
}
static int ov7670_s_contrast(struct v4l2_subdev *sd, int value)
{
return ov7670_write(sd, REG_CONTRAS, (unsigned char) value);
}
static int ov7670_s_hflip(struct v4l2_subdev *sd, int value)
{
unsigned char v = 0;
int ret;
ret = ov7670_read(sd, REG_MVFP, &v);
if (value)
v |= MVFP_MIRROR;
else
v &= ~MVFP_MIRROR;
msleep(10); /* FIXME */
ret += ov7670_write(sd, REG_MVFP, v);
return ret;
}
static int ov7670_s_vflip(struct v4l2_subdev *sd, int value)
{
unsigned char v = 0;
int ret;
ret = ov7670_read(sd, REG_MVFP, &v);
if (value)
v |= MVFP_FLIP;
else
v &= ~MVFP_FLIP;
msleep(10); /* FIXME */
ret += ov7670_write(sd, REG_MVFP, v);
return ret;
}
/*
* GAIN is split between REG_GAIN and REG_VREF[7:6]. If one believes
* the data sheet, the VREF parts should be the most significant, but
* experience shows otherwise. There seems to be little value in
* messing with the VREF bits, so we leave them alone.
*/
static int ov7670_g_gain(struct v4l2_subdev *sd, __s32 *value)
{
int ret;
unsigned char gain;
ret = ov7670_read(sd, REG_GAIN, &gain);
*value = gain;
return ret;
}
static int ov7670_s_gain(struct v4l2_subdev *sd, int value)
{
int ret;
unsigned char com8;
ret = ov7670_write(sd, REG_GAIN, value & 0xff);
/* Have to turn off AGC as well */
if (ret == 0) {
ret = ov7670_read(sd, REG_COM8, &com8);
ret = ov7670_write(sd, REG_COM8, com8 & ~COM8_AGC);
}
return ret;
}
/*
* Tweak autogain.
*/
static int ov7670_s_autogain(struct v4l2_subdev *sd, int value)
{
int ret;
unsigned char com8;
ret = ov7670_read(sd, REG_COM8, &com8);
if (ret == 0) {
if (value)
com8 |= COM8_AGC;
else
com8 &= ~COM8_AGC;
ret = ov7670_write(sd, REG_COM8, com8);
}
return ret;
}
static int ov7670_s_exp(struct v4l2_subdev *sd, int value)
{
int ret;
unsigned char com1, com8, aech, aechh;
ret = ov7670_read(sd, REG_COM1, &com1) +
ov7670_read(sd, REG_COM8, &com8) +
ov7670_read(sd, REG_AECHH, &aechh);
if (ret)
return ret;
com1 = (com1 & 0xfc) | (value & 0x03);
aech = (value >> 2) & 0xff;
aechh = (aechh & 0xc0) | ((value >> 10) & 0x3f);
ret = ov7670_write(sd, REG_COM1, com1) +
ov7670_write(sd, REG_AECH, aech) +
ov7670_write(sd, REG_AECHH, aechh);
/* Have to turn off AEC as well */
if (ret == 0)
ret = ov7670_write(sd, REG_COM8, com8 & ~COM8_AEC);
return ret;
}
/*
* Tweak autoexposure.
*/
static int ov7670_s_autoexp(struct v4l2_subdev *sd,
enum v4l2_exposure_auto_type value)
{
int ret;
unsigned char com8;
ret = ov7670_read(sd, REG_COM8, &com8);
if (ret == 0) {
if (value == V4L2_EXPOSURE_AUTO)
com8 |= COM8_AEC;
else
com8 &= ~COM8_AEC;
ret = ov7670_write(sd, REG_COM8, com8);
}
return ret;
}
static const char * const ov7670_test_pattern_menu[] = {
"No test output",
"Shifting \"1\"",
"8-bar color bar",
"Fade to gray color bar",
};
static int ov7670_s_test_pattern(struct v4l2_subdev *sd, int value)
{
int ret;
ret = ov7670_update_bits(sd, REG_SCALING_XSC, TEST_PATTTERN_0,
value & BIT(0) ? TEST_PATTTERN_0 : 0);
if (ret)
return ret;
return ov7670_update_bits(sd, REG_SCALING_YSC, TEST_PATTTERN_1,
value & BIT(1) ? TEST_PATTTERN_1 : 0);
}
static int ov7670_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
{
struct v4l2_subdev *sd = to_sd(ctrl);
struct ov7670_info *info = to_state(sd);
switch (ctrl->id) {
case V4L2_CID_AUTOGAIN:
return ov7670_g_gain(sd, &info->gain->val);
}
return -EINVAL;
}
static int ov7670_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct v4l2_subdev *sd = to_sd(ctrl);
struct ov7670_info *info = to_state(sd);
switch (ctrl->id) {
case V4L2_CID_BRIGHTNESS:
return ov7670_s_brightness(sd, ctrl->val);
case V4L2_CID_CONTRAST:
return ov7670_s_contrast(sd, ctrl->val);
case V4L2_CID_SATURATION:
return ov7670_s_sat_hue(sd,
info->saturation->val, info->hue->val);
case V4L2_CID_VFLIP:
return ov7670_s_vflip(sd, ctrl->val);
case V4L2_CID_HFLIP:
return ov7670_s_hflip(sd, ctrl->val);
case V4L2_CID_AUTOGAIN:
/* Only set manual gain if auto gain is not explicitly
turned on. */
if (!ctrl->val) {
/* ov7670_s_gain turns off auto gain */
return ov7670_s_gain(sd, info->gain->val);
}
return ov7670_s_autogain(sd, ctrl->val);
case V4L2_CID_EXPOSURE_AUTO:
/* Only set manual exposure if auto exposure is not explicitly
turned on. */
if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
/* ov7670_s_exp turns off auto exposure */
return ov7670_s_exp(sd, info->exposure->val);
}
return ov7670_s_autoexp(sd, ctrl->val);
case V4L2_CID_TEST_PATTERN:
return ov7670_s_test_pattern(sd, ctrl->val);
}
return -EINVAL;
}
static const struct v4l2_ctrl_ops ov7670_ctrl_ops = {
.s_ctrl = ov7670_s_ctrl,
.g_volatile_ctrl = ov7670_g_volatile_ctrl,
};
#ifdef CONFIG_VIDEO_ADV_DEBUG
static int ov7670_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
{
unsigned char val = 0;
int ret;
ret = ov7670_read(sd, reg->reg & 0xff, &val);
reg->val = val;
reg->size = 1;
return ret;
}
static int ov7670_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
{
ov7670_write(sd, reg->reg & 0xff, reg->val & 0xff);
return 0;
}
#endif
static int ov7670_s_power(struct v4l2_subdev *sd, int on)
{
struct ov7670_info *info = to_state(sd);
if (info->pwdn_gpio)
gpiod_set_value(info->pwdn_gpio, !on);
if (on && info->resetb_gpio) {
gpiod_set_value(info->resetb_gpio, 1);
usleep_range(500, 1000);
gpiod_set_value(info->resetb_gpio, 0);
usleep_range(3000, 5000);
}
return 0;
}
static void ov7670_get_default_format(struct v4l2_subdev *sd,
struct v4l2_mbus_framefmt *format)
{
struct ov7670_info *info = to_state(sd);
format->width = info->devtype->win_sizes[0].width;
format->height = info->devtype->win_sizes[0].height;
format->colorspace = info->fmt->colorspace;
format->code = info->fmt->mbus_code;
format->field = V4L2_FIELD_NONE;
}
#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
static int ov7670_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
struct v4l2_mbus_framefmt *format =
v4l2_subdev_get_try_format(sd, fh->pad, 0);
ov7670_get_default_format(sd, format);
return 0;
}
#endif
/* ----------------------------------------------------------------------- */
static const struct v4l2_subdev_core_ops ov7670_core_ops = {
.reset = ov7670_reset,
.init = ov7670_init,
#ifdef CONFIG_VIDEO_ADV_DEBUG
.g_register = ov7670_g_register,
.s_register = ov7670_s_register,
#endif
};
static const struct v4l2_subdev_video_ops ov7670_video_ops = {
.s_frame_interval = ov7670_s_frame_interval,
.g_frame_interval = ov7670_g_frame_interval,
};
static const struct v4l2_subdev_pad_ops ov7670_pad_ops = {
.enum_frame_interval = ov7670_enum_frame_interval,
.enum_frame_size = ov7670_enum_frame_size,
.enum_mbus_code = ov7670_enum_mbus_code,
.get_fmt = ov7670_get_fmt,
.set_fmt = ov7670_set_fmt,
};
static const struct v4l2_subdev_ops ov7670_ops = {
.core = &ov7670_core_ops,
.video = &ov7670_video_ops,
.pad = &ov7670_pad_ops,
};
#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
static const struct v4l2_subdev_internal_ops ov7670_subdev_internal_ops = {
.open = ov7670_open,
};
#endif
/* ----------------------------------------------------------------------- */
static const struct ov7670_devtype ov7670_devdata[] = {
[MODEL_OV7670] = {
.win_sizes = ov7670_win_sizes,
.n_win_sizes = ARRAY_SIZE(ov7670_win_sizes),
.set_framerate = ov7670_set_framerate_legacy,
.get_framerate = ov7670_get_framerate_legacy,
},
[MODEL_OV7675] = {
.win_sizes = ov7675_win_sizes,
.n_win_sizes = ARRAY_SIZE(ov7675_win_sizes),
.set_framerate = ov7675_set_framerate,
.get_framerate = ov7675_get_framerate,
},
};
static int ov7670_init_gpio(struct i2c_client *client, struct ov7670_info *info)
{
info->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "powerdown",
GPIOD_OUT_LOW);
if (IS_ERR(info->pwdn_gpio)) {
dev_info(&client->dev, "can't get %s GPIO\n", "powerdown");
return PTR_ERR(info->pwdn_gpio);
}
info->resetb_gpio = devm_gpiod_get_optional(&client->dev, "reset",
GPIOD_OUT_LOW);
if (IS_ERR(info->resetb_gpio)) {
dev_info(&client->dev, "can't get %s GPIO\n", "reset");
return PTR_ERR(info->resetb_gpio);
}
usleep_range(3000, 5000);
return 0;
}
/*
* ov7670_parse_dt() - Parse device tree to collect mbus configuration
* properties
*/
static int ov7670_parse_dt(struct device *dev,
struct ov7670_info *info)
{
struct fwnode_handle *fwnode = dev_fwnode(dev);
struct v4l2_fwnode_endpoint bus_cfg;
struct fwnode_handle *ep;
int ret;
if (!fwnode)
return -EINVAL;
info->pclk_hb_disable = false;
if (fwnode_property_present(fwnode, "ov7670,pclk-hb-disable"))
info->pclk_hb_disable = true;
ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
if (!ep)
return -EINVAL;
ret = v4l2_fwnode_endpoint_parse(ep, &bus_cfg);
if (ret) {
fwnode_handle_put(ep);
return ret;
}
if (bus_cfg.bus_type != V4L2_MBUS_PARALLEL) {
dev_err(dev, "Unsupported media bus type\n");
fwnode_handle_put(ep);
return ret;
}
info->mbus_config = bus_cfg.bus.parallel.flags;
return 0;
}
static int ov7670_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct v4l2_fract tpf;
struct v4l2_subdev *sd;
struct ov7670_info *info;
int ret;
info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
if (info == NULL)
return -ENOMEM;
sd = &info->sd;
v4l2_i2c_subdev_init(sd, client, &ov7670_ops);
#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
sd->internal_ops = &ov7670_subdev_internal_ops;
sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
#endif
info->clock_speed = 30; /* default: a guess */
if (dev_fwnode(&client->dev)) {
ret = ov7670_parse_dt(&client->dev, info);
if (ret)
return ret;
} else if (client->dev.platform_data) {
struct ov7670_config *config = client->dev.platform_data;
/*
* Must apply configuration before initializing device, because it
* selects I/O method.
*/
info->min_width = config->min_width;
info->min_height = config->min_height;
info->use_smbus = config->use_smbus;
if (config->clock_speed)
info->clock_speed = config->clock_speed;
/*
* It should be allowed for ov7670 too when it is migrated to
* the new frame rate formula.
*/
if (config->pll_bypass && id->driver_data != MODEL_OV7670)
info->pll_bypass = true;
if (config->pclk_hb_disable)
info->pclk_hb_disable = true;
}
info->clk = devm_clk_get(&client->dev, "xclk");
if (IS_ERR(info->clk))
return PTR_ERR(info->clk);
ret = clk_prepare_enable(info->clk);
if (ret)
return ret;
info->clock_speed = clk_get_rate(info->clk) / 1000000;
if (info->clock_speed < 10 || info->clock_speed > 48) {
ret = -EINVAL;
goto clk_disable;
}
ret = ov7670_init_gpio(client, info);
if (ret)
goto clk_disable;
ov7670_s_power(sd, 1);
/* Make sure it's an ov7670 */
ret = ov7670_detect(sd);
if (ret) {
v4l_dbg(1, debug, client,
"chip found @ 0x%x (%s) is not an ov7670 chip.\n",
client->addr << 1, client->adapter->name);
goto power_off;
}
v4l_info(client, "chip found @ 0x%02x (%s)\n",
client->addr << 1, client->adapter->name);
info->devtype = &ov7670_devdata[id->driver_data];
info->fmt = &ov7670_formats[0];
ov7670_get_default_format(sd, &info->format);
info->clkrc = 0;
/* Set default frame rate to 30 fps */
tpf.numerator = 1;
tpf.denominator = 30;
info->devtype->set_framerate(sd, &tpf);
v4l2_ctrl_handler_init(&info->hdl, 10);
v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
V4L2_CID_CONTRAST, 0, 127, 1, 64);
v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
V4L2_CID_VFLIP, 0, 1, 1, 0);
v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
V4L2_CID_HFLIP, 0, 1, 1, 0);
info->saturation = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
V4L2_CID_SATURATION, 0, 256, 1, 128);
info->hue = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
V4L2_CID_HUE, -180, 180, 5, 0);
info->gain = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
V4L2_CID_GAIN, 0, 255, 1, 128);
info->auto_gain = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
info->exposure = v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
V4L2_CID_EXPOSURE, 0, 65535, 1, 500);
info->auto_exposure = v4l2_ctrl_new_std_menu(&info->hdl, &ov7670_ctrl_ops,
V4L2_CID_EXPOSURE_AUTO, V4L2_EXPOSURE_MANUAL, 0,
V4L2_EXPOSURE_AUTO);
v4l2_ctrl_new_std_menu_items(&info->hdl, &ov7670_ctrl_ops,
V4L2_CID_TEST_PATTERN,
ARRAY_SIZE(ov7670_test_pattern_menu) - 1, 0, 0,
ov7670_test_pattern_menu);
sd->ctrl_handler = &info->hdl;
if (info->hdl.error) {
ret = info->hdl.error;
goto hdl_free;
}
/*
* We have checked empirically that hw allows to read back the gain
* value chosen by auto gain but that's not the case for auto exposure.
*/
v4l2_ctrl_auto_cluster(2, &info->auto_gain, 0, true);
v4l2_ctrl_auto_cluster(2, &info->auto_exposure,
V4L2_EXPOSURE_MANUAL, false);
v4l2_ctrl_cluster(2, &info->saturation);
#if defined(CONFIG_MEDIA_CONTROLLER)
info->pad.flags = MEDIA_PAD_FL_SOURCE;
info->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
ret = media_entity_pads_init(&info->sd.entity, 1, &info->pad);
if (ret < 0)
goto hdl_free;
#endif
v4l2_ctrl_handler_setup(&info->hdl);
ret = v4l2_async_register_subdev(&info->sd);
if (ret < 0)
goto entity_cleanup;
return 0;
entity_cleanup:
media_entity_cleanup(&info->sd.entity);
hdl_free:
v4l2_ctrl_handler_free(&info->hdl);
power_off:
ov7670_s_power(sd, 0);
clk_disable:
clk_disable_unprepare(info->clk);
return ret;
}
static int ov7670_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
struct ov7670_info *info = to_state(sd);
v4l2_async_unregister_subdev(sd);
v4l2_ctrl_handler_free(&info->hdl);
clk_disable_unprepare(info->clk);
media_entity_cleanup(&info->sd.entity);
ov7670_s_power(sd, 0);
return 0;
}
static const struct i2c_device_id ov7670_id[] = {
{ "ov7670", MODEL_OV7670 },
{ "ov7675", MODEL_OV7675 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ov7670_id);
#if IS_ENABLED(CONFIG_OF)
static const struct of_device_id ov7670_of_match[] = {
{ .compatible = "ovti,ov7670", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, ov7670_of_match);
#endif
static struct i2c_driver ov7670_driver = {
.driver = {
.name = "ov7670",
.of_match_table = of_match_ptr(ov7670_of_match),
},
.probe = ov7670_probe,
.remove = ov7670_remove,
.id_table = ov7670_id,
};
module_i2c_driver(ov7670_driver);
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