Camera

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Introduction

FirePrime development board has CIF interface, which supports front/back cameras.

The following CIF cameras are supported in the driver directory kernel/drivers/media/video:

  • gc0307
  • gc0308
  • gc0309
  • gc0328
  • gc0329
  • gc2015
  • gc2035
  • gt2005
  • hm2057
  • hm5065
  • mt9p111
  • nt99160
  • nt99240
  • ov2659
  • ov5640
  • sp0838
  • sp2518

This chapter mainly describes how to configure CIF.

Configuration Steps

Add Sensor Connection

Camera list is defined in file kernel/arch/arm/boot/dts/rk3128-cif-sensor.dtsi:

	rk3128_cif_sensor: rk3128_cif_sensor{
			compatible = "rockchip,sensor";
			status = "disabled";
			CONFIG_SENSOR_POWER_IOCTL_USR 		= <1>;
			CONFIG_SENSOR_RESET_IOCTL_USR 		= <0>;
			CONFIG_SENSOR_POWERDOWN_IOCTL_USR	= <0>;
			CONFIG_SENSOR_FLASH_IOCTL_USR	  	= <0>;
			CONFIG_SENSOR_AF_IOCTL_USR	   		= <0>;
// ... skip some modules
gc0329{
			is_front = <1>;
			rockchip,powerdown = <&gpio3 GPIO_D7 GPIO_ACTIVE_HIGH>;
			pwdn_active = <gc0329_PWRDN_ACTIVE>;
			#rockchip,power = <>;
			pwr_active = <PWR_ACTIVE_HIGH>;
			#rockchip,reset = <>;
			#rst_active = <>;
			#rockchip,flash = <>;
			#rockchip,af = <>;
			mir = <0>;
			flash_attach = <0>;
			resolution = <gc0329_FULL_RESOLUTION>;
			powerup_sequence = <gc0329_PWRSEQ>;
			orientation = <0>;
			i2c_add = <gc0329_I2C_ADDR>;
			i2c_rata = <100000>;
			i2c_chl = <0>;
			cif_chl = <0>;
			mclk_rate = <24>;
		};
		gc0329_b {
			is_front = <0>;
			rockchip,powerdown = <&gpio3 GPIO_B3 GPIO_ACTIVE_HIGH>;
			pwdn_active = <gc0329_PWRDN_ACTIVE>;
			#rockchip,power = <>;
			pwr_active = <PWR_ACTIVE_HIGH>;
			#rockchip,reset = <>;
			#rst_active = <>;
			#rockchip,flash = <>;
			#rockchip,af = <>;
			mir = <0>;
			flash_attach = <0>;
			resolution = <gc0329_FULL_RESOLUTION>;
			powerup_sequence = <gc0329_PWRSEQ>;
			orientation = <0>;
			i2c_add = <gc0329_I2C_ADDR>;
			i2c_rata = <100000>;
			i2c_chl = <0>; // <0>;
			cif_chl = <0>;
			mclk_rate = <24>;
		};
	};

Here, we list the configuration of gc0329 back/front cameras with description:

  • is_front: 0: back camera,1: front camera
  • rockchip,powerdown: defines the camera's powerdown gpio
  • pwdn_active: effect voltage level of powerdown
  • mir: 0: don't support mirror, 1: support mirror
  • resolution: maximum camera resolution
  • orientation: 0: 0 degree, 90: 90 degrees, 180: 180 degrees, 270: 270 degrees
  • i2c_add: Camera's I2C address
  • i2c_rata: I2C frequency, with Hz unit.
  • i2c_chl: I2C channel number
  • cif_chl: cif controller info.rk312x only has cif0
  • mclk_rate: sensor clock frequency, with MHz unit.

Some of the constants are defined in kernel/arch/arm/mach-rockchip/rk_camera_sensor_info.h:

#define gc0329_FULL_RESOLUTION      0x30000            // 0.3 megapixel
#define gc0329_I2C_ADDR             0x62
#define gc0329_PWRDN_ACTIVE             0x01
#define gc0329_PWRSEQ                   sensor_PWRSEQ_DEFAULT
//Sensor power  active level define
#define PWR_ACTIVE_HIGH                  0x01
#define PWR_ACTIVE_LOW					 0x0

The resolutions are defined in function sensor_get_full_width_height in kernel/drivers/media/video/generic_sensor.h:

static inline int sensor_get_full_width_height(int full_resolution, unsigned short *w, unsigned short *h)
{
    switch (full_resolution)
    {
        case 0x30000:
        {
            *w = 640;
            *h = 480;
            break;
        }
 
        case 0x100000:
        {
            *w = 1024;
            *h = 768;
            break;
        }
        //...
    }
}

Enable CIF Sensor Device

To enable CIF, add the following lines to kernel/arch/arm/boot/dts/rk3128-fireprime.dts:

    &rk3128_cif_sensor{
	    status = "okay";
    };