android_驱动_qcom_【高通SDM660平台 Android 10.0】(10) --- Camera Sensor lib 与 Kernel Camera Probe 代码分析

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《【高通SDM660平台】(1) — Camera 驱动 Bringup Guide》
《【高通SDM660平台】(2) — Camera Kernel 驱动层代码逻辑分析》
《【高通SDM660平台】(3) — Camera V4L2 驱动层分析 》
《【高通SDM660平台】(4) — Camera Init 初始化流程 》
《【高通SDM660平台】(5) — Camera Open 流程》
《【高通SDM660平台】(6) — Camera getParameters 及 setParameters 流程》
《【高通SDM660平台】(7) — Camera onPreview 代码流程》
《【高通SDM660平台】(8) — Camera MetaData介绍》
《【高通SDM660平台 Android 10.0】(9) — Qcom Camera Daemon 代码分析》
《【高通SDM660平台 Android 10.0】(10) — Camera Sensor lib 与 Kernel Camera Probe 代码分析》
《【高通SDM660平台】Camera Capture 流程》
《【高通SDM660平台】Camera mm-qcamera-app 代码分析》

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在前面《【高通SDM660平台 Android 10.0】Qcom Camera Daemon 代码分析》 中，
我们分析了 Camera module_sensor_init() 的整个过程，考虑到篇幅的问题，本文是接module_sensor_init() 继续分析的。
主题如下：

1. 分析 Camera lib 库的代码
2. vendor 下发 CFG_SINIT_PROBE 后，Kernel 中 Camera Probe的流程

好, 开始吧！

一、libmmcamera_imx258.so 代码分析

Sensor LIB 库代码位于 /vendor/qcom/proprietary/mm-camera/mm-camera2/media-controller/modules/sensors/sensor/libs
本文以 imx258 为例。

先来看下imx258_lib.c，其最核心的函数就是 sensor_open_lib，
返回 sensor_lib_ptr 结构体，所有的 Camera 信息，都保存在该结构体中。

@ /vendor/qcom/proprietary/mm-camera/mm-camera2/media-controller/modules/sensors/sensor/libs/imx258/imx258_lib.c

/**

• FUNCTION: sensor_open_lib
• DESCRIPTION: Open sensor library and returns data pointer
  **/
  void *sensor_open_lib(void)
  {
  return &sensor_lib_ptr;
  }

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我们来看下 sensor_lib_ptr 结构体的定义

1.1 struct sensor_lib_t 结构体

@ /vendor/qcom/proprietary/mm-camerasdk/sensor/includes/sensor_lib.h
typedef struct {
  /* sensor slave info */ 
  // 从设备包括，I2C地址、I2C速率、Sensor_id 寄存器地址及Sensor_id 值、上下电的时序及电压值
  struct camera_sensor_slave_info sensor_slave_info;

/* sensor output settings */
// 包括 出图的格式（BAYER / YCbCr）, 连接类型为 MIPI CSI
sensor_output_t sensor_output;

/* sensor output register address */
// 输出寄存器的地址，pclk，及line length pclk 、 frame length lines
struct sensor_output_reg_addr_t output_reg_addr;

/* sensor exposure gain register address */
// 曝光增益
struct sensor_exp_gain_info_t exp_gain_info;

/* sensor aec info */
sensor_aec_data_t aec_info;

/* number of frames to skip after start stream info */
// preview 前丢弃过的 帧数
unsigned short sensor_num_frame_skip;

/* number of frames to skip after start HDR stream info */
// HDR 丢弃的帧数
unsigned short sensor_num_HDR_frame_skip;

/* sensor pipeline delay */
// pipeline 帧延时
unsigned int sensor_max_pipeline_frame_delay;

/* sensor lens info */
// sensor line info 信息
sensor_property_t sensor_property;

/* imaging pixel array size info */
// 像素点大小，宽高
sensor_imaging_pixel_array_size pixel_array_size_info;

/* Sensor color level information */
// 颜色等级
sensor_color_level_info color_level_info;

/* sensor port info that consists of cid mask and fourcc mapaping */
sensor_stream_info_array_t sensor_stream_info_array;

/* Sensor Settings */
// 初始化Camera 寄存器配置
struct camera_i2c_reg_setting_array start_settings;
// 关闭Camera 时的寄存器配置
struct camera_i2c_reg_setting_array stop_settings;
struct camera_i2c_reg_setting_array groupon_settings;
struct camera_i2c_reg_setting_array groupoff_settings;
struct camera_i2c_reg_setting_array embedded_data_enable_settings;
struct camera_i2c_reg_setting_array embedded_data_disable_settings;
struct camera_i2c_reg_setting_array aec_enable_settings;
struct camera_i2c_reg_setting_array aec_disable_settings;
struct camera_i2c_reg_setting_array dualcam_master_settings;
struct camera_i2c_reg_setting_array dualcam_slave_settings;

/* sensor test pattern info /
// 测试图信息
sensor_test_info test_pattern_info;
/ sensor effects info */
struct sensor_effect_info effect_info;

/* Sensor Settings Array */
//初始化 Camera 寄存器配置
struct sensor_lib_reg_settings_array init_settings_array;
struct sensor_lib_reg_settings_array res_settings_array;

// 不同辨率的输出信息，xy像素大小，pclk,fps，数据传输速率
struct sensor_lib_out_info_array out_info_array;
// MIPI CSI 信息
struct sensor_csi_params csi_params;
struct sensor_csid_lut_params_array csid_lut_params_array;
struct sensor_lib_crop_params_array crop_params_array;

/* Exposure Info */
sensor_exposure_table_t exposure_func_table;

/* video_hdr mode info*/
struct sensor_lib_meta_data_info_array meta_data_out_info_array;

/* sensor optical black regions */
sensor_optical_black_region_t optical_black_region_info;

/* sensor_capability */
sensor_capability_t sensor_capability;

/* sensor_awb_table_t */
sensor_awb_table_t awb_func_table;

/* sensor_awb_table_t */

sensor_fps_table_t fps_func_table;

/* Parse RDI stats callback function */
sensor_RDI_parser_stats_t parse_RDI_stats;

/* full size info */
sensor_rolloff_config rolloff_config;

/* analog-digital conversion time */
long long adc_readout_time;

/* number of frames to skip for fast AEC use case */
unsigned short sensor_num_fast_aec_frame_skip;

/* add soft delay for sensor settings like exposure, gain …*/
unsigned char app_delay[SENSOR_DELAY_MAX];

/* for noise profile calculation
Tuning team must update with proper values. */
struct sensor_noise_coefficient_t noise_coeff;

/* Flag to be set if any external library are to be loaded */
unsigned char external_library;

sensorlib_pdaf_apis_t sensorlib_pdaf_api;
// PDAF 配轩
pdaf_lib_t pdaf_config;

/* sensor orientation flag */
sensor_orientation_type_t sensor_orientation;

} sensor_lib_t;

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1.2 imx258_lib.h 头文件分析

@ /vendor/qcom/proprietary/mm-camera/mm-camera2/media-controller/modules/sensors/sensor/libs/imx258/imx258_lib.h

/* imx258_lib.h
*

• Copyright © 2015-2018 Qualcomm Technologies, Inc.
• All Rights Reserved.
• Confidential and Proprietary - Qualcomm Technologies, Inc.
  */

#ifndef IMX258_LIB_H
#define IMX258_LIB_H

#include “sensor_lib.h”
#include “eeprom_lib.h”
#include “pdaf_api.h”
#include “pdaf_camif_api.h”
#define SENSOR_MODEL “imx258”

/* IMX258 Regs */
#define IMX258_DIG_GAIN_GR_ADDR 0x020E
#define IMX258_DIG_GAIN_R_ADDR 0x0210
#define IMX258_DIG_GAIN_B_ADDR 0x0212
#define IMX258_DIG_GAIN_GB_ADDR 0x0214
#define IMX258_EXP_RATIO_ADDR 0x0222
#define IMX258_ABS_GAIN_R_WORD_ADDR 0x0B90
#define IMX258_ABS_GAIN_B_WORD_ADDR 0x0B92

/* IMX258 CONSTANTS */
#define IMX258_MAX_INTEGRATION_MARGIN 20

/* STATS DATA TYPE */
#define IMX258_CSI_PD_ISTATS 0x2F

#define IMX258_DATA_PEDESTAL 0x40 /* 10bit value */

#define IMX258_MIN_AGAIN_REG_VAL 0 /* 1.0x /
#define IMX258_MAX_AGAIN_REG_VAL 480 / 16.0x */

#define IMX258_MIN_DGAIN_REG_VAL 256 /* 1.0x /
#define IMX258_MAX_DGAIN_REG_VAL 256 / 1.0x */

#define IMX258_MAX_DGAIN_DECIMATOR 256

/* IMX258 FORMULAS */
#define IMX258_MIN_AGAIN (512 / (512 - IMX258_MIN_AGAIN_REG_VAL))
#define IMX258_MAX_AGAIN (512 / (512 - IMX258_MAX_AGAIN_REG_VAL))

#define IMX258_MIN_DGAIN (IMX258_MIN_DGAIN_REG_VAL / 256)
#define IMX258_MAX_DGAIN (IMX258_MAX_DGAIN_REG_VAL / 256)

#define IMX258_MIN_GAIN IMX258_MIN_AGAIN * IMX258_MIN_DGAIN
#define IMX258_MAX_GAIN IMX258_MAX_AGAIN * IMX258_MAX_DGAIN

/* uncomment FLIP_MIRROR macro to
enable flip and mirror in sensor readout
change bayer pattern
load pdaf flip and mirror header
*/
//#define FLIP_MIRROR
#define START_REG_ARRAY
{
{0x0100, 0x01, 0x00},
}

#define STOP_REG_ARRAY
{
{0x0100, 0x00, 0x00},
}

#define GROUPON_REG_ARRAY
{
{0x0104, 0x01, 0x00},
}

#define GROUPOFF_REG_ARRAY
{
{0x0104, 0x00, 0x00},
}

// 初始化 寄存器配置
#define INIT0_REG_ARRAY
{
/* External Clock Settings /
{0x0136, 0x18, 0x00},
{0x0137, 0x00, 0x00},
/ Global Settings */
{0x3051, 0x00, 0x00},
...... //配置一系烈的寄存器
{0x3006, 0x00, 0x00},
{0x3007, 0x00, 0x00},
}

#ifndef FLIP_MIRROR
#define FLIP_MIRROR_SETTING {{0x0101, 0x00, 0x00}}
#else
#define FLIP_MIRROR_SETTING {{0x0101, 0x03, 0x00}}
#endif
// 分辨率0 寄存器配置
#define RES0_REG_ARRAY
{
/* Mode A1: 4208x3120 Full 30fps /
/ Output Format Settings /
{0x0112, 0x0A, 0x00},
{0x0113, 0x0A, 0x00},
...... //配置一系烈的寄存器
{0x0818, 0x00, 0x00},
{0x0819, 0x47, 0x00},
}
// 分辨率1 寄存器配置
#define RES1_REG_ARRAY
{
/ (Reg-10)Mode: Full 16:9 30 fps /
/ Output Format Settings /
{0x0112, 0x0A, 0x00},
{0x0113, 0x0A, 0x00},
/ Clock Settings /
{0x0301, 0x05, 0x00},
{0x0303, 0x02, 0x00},
...... //配置一系烈的寄存器
{0x0818, 0x00, 0x00},
{0x0819, 0x47, 0x00},
}
// 分辨率2 寄存器配置
#define RES2_REG_ARRAY
{
/ Mode: 2100x1560 2x2 binning 30 fps /
/ Output Format Settings /
{0x0112, 0x0A, 0x00},
{0x0113, 0x0A, 0x00},
...... //配置一系烈的寄存器
{0x0819, 0x47, 0x00},
{0x3031, 0x00, 0x00},
}
// 分辨率3 寄存器配置
#define RES3_REG_ARRAY
{
/ Mode: 2100x1176 60 fps /
/ Output Format Settings /
{0x0112, 0x0A, 0x00},
{0x0113, 0x0A, 0x00},
...... //配置一系列的寄存器
{0x0819, 0x47, 0x00},
{0x3031, 0x00, 0x00},
}
// 分辨率4 寄存器配置
#define RES4_REG_ARRAY
{
/ Mode: 1400x784 90 fps*/
/* Output Format Settings /
{0x0112, 0x0A, 0x00},
{0x0113, 0x0A, 0x00},
...... //配置一系列的寄存器
{0x0819, 0x47, 0x00},
{0x3031, 0x00, 0x00},
}
// 分辨率5 寄存器配置
#define RES5_REG_ARRAY
{
/ Mode: 1400x760 120 fps*/
/* Output Format Settings */
{0x0112, 0x0A, 0x00},
{0x0113, 0x0A, 0x00},
...... //配置一系列的寄存器
{0x0819, 0x47, 0x00},
{0x3031, 0x00, 0x00},
}

/* Sensor Handler /
static sensor_lib_t sensor_lib_ptr =
{
.sensor_slave_info =
{
.sensor_name = SENSOR_MODEL, // “imx258”
.slave_addr = 0x20, // 7位地址0x20， 010 0000， 对应的8位地址为0100 0000, 0x40
.i2c_freq_mode = SENSOR_I2C_MODE_FAST,
.addr_type = CAMERA_I2C_WORD_ADDR,
.sensor_id_info =
{
.sensor_id_reg_addr = 0x0016,
.sensor_id = 0x0258,
},
.power_setting_array =
{
.power_setting_a =
{
{
.seq_type = CAMERA_POW_SEQ_GPIO,
.seq_val = CAMERA_GPIO_RESET,
.config_val = GPIO_OUT_LOW,
.delay = 1,
},
{
.seq_type = CAMERA_POW_SEQ_GPIO,
.seq_val = CAMERA_GPIO_VANA,
.config_val = GPIO_OUT_HIGH,
.delay = 1,
},
{
.seq_type = CAMERA_POW_SEQ_VREG,
.seq_val = CAMERA_VANA,
.config_val = 0,
.delay = 0,
},
{
.seq_type = CAMERA_POW_SEQ_GPIO,
.seq_val = CAMERA_GPIO_VDIG,
.config_val = GPIO_OUT_HIGH,
.delay = 1,
},
{
.seq_type = CAMERA_POW_SEQ_VREG,
.seq_val = CAMERA_VDIG,
.config_val = 0,
.delay = 0,
},
{
.seq_type = CAMERA_POW_SEQ_VREG,
.seq_val = CAMERA_VIO,
.config_val = 0,
.delay = 0,
},
{
.seq_type = CAMERA_POW_SEQ_GPIO,
.seq_val = CAMERA_GPIO_VAF,
.config_val = GPIO_OUT_HIGH,
.delay = 1,
},
{
.seq_type = CAMERA_POW_SEQ_CLK,
.seq_val = CAMERA_MCLK,
.config_val = 24000000,
.delay = 1,
},
{
.seq_type = CAMERA_POW_SEQ_GPIO,
.seq_val = CAMERA_GPIO_RESET,
.config_val = GPIO_OUT_HIGH,
.delay = 12,
},
},
.size = 9,
.power_down_setting_a =
{
{
.seq_type = CAMERA_POW_SEQ_GPIO,
.seq_val = CAMERA_GPIO_RESET,
.config_val = GPIO_OUT_LOW,
.delay = 1,
},
{
.seq_type = CAMERA_POW_SEQ_CLK,
.seq_val = CAMERA_MCLK,
.config_val = 0,
.delay = 1,
},
{
.seq_type = CAMERA_POW_SEQ_VREG,
.seq_val = CAMERA_VIO,
.config_val = 0,
.delay = 0,
},
{
.seq_type = CAMERA_POW_SEQ_VREG,
.seq_val = CAMERA_VDIG,
.config_val = 0,
.delay = 0,
},
{
.seq_type = CAMERA_POW_SEQ_GPIO,
.seq_val = CAMERA_GPIO_VDIG,
.config_val = GPIO_OUT_LOW,
.delay = 1,
},
{
.seq_type = CAMERA_POW_SEQ_VREG,
.seq_val = CAMERA_VANA,
.config_val = 0,
.delay = 0,
},
{
.seq_type = CAMERA_POW_SEQ_GPIO,
.seq_val = CAMERA_GPIO_VANA,
.config_val = GPIO_OUT_LOW,
.delay = 1,
},
{
.seq_type = CAMERA_POW_SEQ_GPIO,
.seq_val = CAMERA_GPIO_VAF,
.config_val = GPIO_OUT_LOW,
.delay = 1,
},
},
.size_down = 8,
},
},
.sensor_output =
{
.output_format = SENSOR_BAYER,
.connection_mode = SENSOR_MIPI_CSI,
.raw_output = SENSOR_10_BIT_DIRECT,
#ifndef FLIP_MIRROR
.filter_arrangement = SENSOR_RGGB,
#else
.filter_arrangement = SENSOR_BGGR,
#endif
},
.output_reg_addr =
{
.x_output = 0x034C,
.y_output = 0x034E,
.line_length_pclk = 0x0342,
.frame_length_lines = 0x0340,
},
.exp_gain_info =
{
.coarse_int_time_addr = 0x0202,
.global_gain_addr = 0x0204,
.vert_offset = IMX258_MAX_INTEGRATION_MARGIN,
},
.aec_info =
{
.min_gain = IMX258_MIN_GAIN,
.max_gain = IMX258_MAX_GAIN,
.max_analog_gain = IMX258_MAX_AGAIN,
.max_linecount = 65525 - IMX258_MAX_INTEGRATION_MARGIN,
},
.sensor_num_frame_skip = 2,
.sensor_num_HDR_frame_skip = 2,
.sensor_max_pipeline_frame_delay = 2,
.sensor_property =
{
.pix_size = 1.12, / um /
.sensing_method = SENSOR_SMETHOD_ONE_CHIP_COLOR_AREA_SENSOR,
.crop_factor = 5.78,
},
.pixel_array_size_info =
{
.active_array_size =
{
.width = 4208,
.height = 3120,
},
.left_dummy = 8,
.right_dummy = 8,
.top_dummy = 8,
.bottom_dummy = 8,
},
.color_level_info =
{
.white_level = 1023,
.r_pedestal = IMX258_DATA_PEDESTAL,
.gr_pedestal = IMX258_DATA_PEDESTAL,
.gb_pedestal = IMX258_DATA_PEDESTAL,
.b_pedestal = IMX258_DATA_PEDESTAL,
},
.start_settings =
{
.reg_setting_a = START_REG_ARRAY,
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_BYTE_DATA,
.delay = 0,
},
.stop_settings =
{
.reg_setting_a = STOP_REG_ARRAY,
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_BYTE_DATA,
.delay = 0,
},
.groupon_settings =
{
.reg_setting_a = GROUPON_REG_ARRAY,
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_BYTE_DATA,
.delay = 0,
},
.groupoff_settings =
{
.reg_setting_a = GROUPOFF_REG_ARRAY,
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_BYTE_DATA,
.delay = 0,
},
.dualcam_master_settings =
{
.reg_setting_a = DUALCAM_MASTER_REG_ARRAY,
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_BYTE_DATA,
.delay = 0,
.size = 8,
},
.embedded_data_enable_settings =
{
.reg_setting_a = {},
.addr_type = 0,
.data_type = 0,
.delay = 0,
},
.embedded_data_disable_settings =
{
.reg_setting_a = {},
.addr_type = 0,
.data_type = 0,
.delay = 0,
},
.test_pattern_info =
{
.test_pattern_settings =
{
{
.mode = SENSOR_TEST_PATTERN_OFF,
.settings =
{
.reg_setting_a =
{
{0x0600, 0x0000, 0x00},
},
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_WORD_DATA,
.delay = 0,
}
},
{
.mode = SENSOR_TEST_PATTERN_SOLID_COLOR,
.settings =
{
.reg_setting_a =
{
{0x0600, 0x0001, 0x00},
},
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_WORD_DATA,
.delay = 0,
},
},
{
.mode = SENSOR_TEST_PATTERN_COLOR_BARS,
.settings =
{
.reg_setting_a =
{
{0x0600, 0x0002, 0x00},
},
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_WORD_DATA,
.delay = 0,
},
},
{
.mode = SENSOR_TEST_PATTERN_COLOR_BARS_FADE_TO_GRAY,
.settings =
{
.reg_setting_a =
{
{0x0600, 0x0003, 0x00},
},
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_WORD_DATA,
.delay = 0,
},
},
{
.mode = SENSOR_TEST_PATTERN_PN9,
.settings =
{
.reg_setting_a =
{
{0x0600, 0x0004, 0x00},
},
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_WORD_DATA,
.delay = 0,
},
},
},
.size = 5,
.solid_mode_addr =
{
.r_addr = 0x0602,
.gr_addr = 0x0604,
.gb_addr = 0x0608,
.b_addr = 0x0606,
},
},
.init_settings_array =
{
.reg_settings =
{
{
.reg_setting_a = INIT0_REG_ARRAY,
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_BYTE_DATA,
.delay = 0,
},
{
.reg_setting_a = FLIP_MIRROR_SETTING,
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_BYTE_DATA,
.delay = 0,
},
},
.size = 2,
},
.res_settings_array =
{
.reg_settings =
{
/ Res 0 /
{
.reg_setting_a = RES0_REG_ARRAY,
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_BYTE_DATA,
.delay = 0,
},
/ Res 1 /
{
.reg_setting_a = RES1_REG_ARRAY,
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_BYTE_DATA,
.delay = 0,
},
/ Res 2 /
{
.reg_setting_a = RES2_REG_ARRAY,
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_BYTE_DATA,
.delay = 0,
},
/ Res 3 /
{
.reg_setting_a = RES3_REG_ARRAY,
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_BYTE_DATA,
.delay = 0,
},
/ Res 4 /
{
.reg_setting_a = RES4_REG_ARRAY,
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_BYTE_DATA,
.delay = 0,
},
/ Res 5 /
{
.reg_setting_a = RES5_REG_ARRAY,
.addr_type = CAMERA_I2C_WORD_ADDR,
.data_type = CAMERA_I2C_BYTE_DATA,
.delay = 0,
},
},
.size = 6,
},
.out_info_array =
{
.out_info =
{ / Res 0 /
{
.x_output = 4208,
.y_output = 3120,
.line_length_pclk = 5352,
.frame_length_lines = 3224,
.op_pixel_clk = 480000000,
.binning_factor = 1,
.min_fps = 7.500,
.max_fps = 30.04,
.mode = SENSOR_DEFAULT_MODE,
.offset_x = 0,
.offset_y = 0,
.scale_factor = 1.000,
.is_pdaf_supported = 1,
.data_rate = 1296000000ULL 4
},
/* Res 1 /
{
.x_output = 4208,
.y_output = 2352,
.line_length_pclk = 5352,
.frame_length_lines = 2852,
.op_pixel_clk = 458400000,
.binning_factor = 1,
.min_fps = 7.500,
.max_fps = 30.03,
.mode = SENSOR_DEFAULT_MODE,
.offset_x = 0,
.offset_y = 384,
.scale_factor = 1.000,
.is_pdaf_supported = 1,
.data_rate = 1296000000ULL 4
},
/* Res 2 /
{
.x_output = 2100,
.y_output = 1560,
.line_length_pclk = 5352,
.frame_length_lines = 2851,
.op_pixel_clk = 458400000,
.binning_factor = 2,
.min_fps = 7.500,
.max_fps = 30.04,
.mode = SENSOR_DEFAULT_MODE,
.offset_x = 0,
.offset_y = 0,
.scale_factor = 1.000,
.is_pdaf_supported = 0,
.data_rate = 1296000000ULL 4
},
/* Res 3*/
{
.x_output = 2100,
.y_output = 1176,
.line_length_pclk = 5352,
.frame_length_lines = 1424,
.op_pixel_clk = 458400000,
.binning_factor = 2,
.min_fps = 7.500,
.max_fps = 60.14,
.mode = SENSOR_HFR_MODE | SENSOR_DEFAULT_MODE,
.offset_x = 0,
.offset_y = 384,
.scale_factor = 1.000,
.is_pdaf_supported = 0,
.data_rate = 1296000000ULL 4
},
/ Res 4 /
{
.x_output = 1400,
.y_output = 784,
.line_length_pclk = 5352,
.frame_length_lines = 948,
.op_pixel_clk = 458400000,
.binning_factor = 2,
.min_fps = 7.500,
.max_fps = 90.18,
.mode = SENSOR_HFR_MODE,
.offset_x = 0,
.offset_y = 384,
.scale_factor = 1.000,
.is_pdaf_supported = 0,
.data_rate = 1296000000ULL 4
},
/* Res 5 /
{
.x_output = 1400,
.y_output = 760,
.line_length_pclk = 5352,
.frame_length_lines = 828,
.op_pixel_clk = 480000000,
.binning_factor = 2,
.min_fps = 7.500,
.max_fps = 120.47,
.mode = SENSOR_HFR_MODE,
.offset_x = 0,
.offset_y = 384,
.scale_factor = 1.000,
.is_pdaf_supported = 0,
.data_rate = 1296000000ULL 4
},
},
.size = 6,
},
.csi_params =
{
.lane_cnt = 4,
.settle_cnt = 0xB,
.is_csi_3phase = 0,
},
.exposure_func_table =
{
.sensor_calculate_exposure = sensor_calculate_exposure,
.sensor_fill_exposure_array = sensor_fill_exposure_array,
},
.meta_data_out_info_array =
{
.meta_data_out_info =
{
{
/* set the meta half size which it should be to overcome the isp bug */
.width = 80,
.height = 1920,
.stats_type = PD_STATS,
.dt = IMX258_CSI_PD_ISTATS,
},
},
.size = 1,
},
.sensor_capability = 0,
.awb_func_table =
{
.sensor_fill_awb_array = 0,
.awb_table_size = 0,
},
.parse_RDI_stats =
{
.parse_VHDR_stats = NULL,
},
.rolloff_config =
{
.enable = FALSE,
.full_size_info =
{
.full_size_width = 0,
.full_size_height = 0,
.full_size_left_crop = 0,
.full_size_top_crop = 0,
},
},
.adc_readout_time = 0,
.sensor_num_fast_aec_frame_skip = 0,
.noise_coeff = {
.gradient_S = 3.738032e-06,
.offset_S = 3.651935e-04,
.gradient_O = 6.396835e-11,
.offset_O = -2.968624e-04,
},
.pdaf_config = {
#ifndef FLIP_MIRROR
#include “imx258_pdaf.h”
#else
#include “imx258_pdaf_flip_mirror.h”
#endif
},
};

#endif /* IMX258_LIB_H */

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二、 Kernel Camera Probe 代码分析

前面我们 mm-camera/mm-camera2/media-controller/modules/sensors/module/sensor_init.c 中，会下发 CFG_SINIT_PROBE 给到kernel 中。

  memset(&cfg, 0, sizeof(cfg));
  cfg.cfgtype = CFG_SINIT_PROBE;
  cfg.cfg.setting = slave_info;
  ioctl(fd, VIDIOC_MSM_SENSOR_INIT_CFG, &cfg);

   
   
   
   

   
   
   
   

    
    
    
    
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Kernel 中处理的地方为：

@/kernel/msm-4.14/drivers/media/platform/msm/camera_v2/sensor/msm_sensor_init.c

/* Static function definition /
static int32_t msm_sensor_driver_cmd(struct msm_sensor_init_t s_init,void arg)
{
struct sensor_init_cfg_data cfg = (struct sensor_init_cfg_data *)arg;

switch (cfg->cfgtype) {
case CFG_SINIT_PROBE:
	s_init->module_init_status = 0;
	rc = msm_sensor_driver_probe(cfg->cfg.setting, &cfg->probed_info, cfg->entity_name);
	break;

}

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前面代码中， cfg.setting 就是 cfg.cfg.setting = slave_info;， 而最终probe 的结果，保存在 cfg->probed_info 中。

2.1 msm_sensor_driver_probe() 代码分析

1. 获取上层下发的slave_info 信息
2. 根据camera id 获取该camera 的控制函数
3. 如果已经probe 过了，则更新 probed_info 信息
4. 获取 power 上下电信息
5. 保存 Camera_info 结构体，包括 slave_addr，sensor id, setting
6. 填充上电信息
7. 填充下电信息
8. 更新外设设备信息
9. 解析eeprom、actuator、flash 等的dts 信息
10. 开始上电，上电后会进行check_id 操作，如果 sensor id 匹配成功，则返回成功
11. 将sensor 加加载到V4L2 subdev 中，创建 节点 /dev/videoX
12. 下电，保存 sensor_info 信息到 s_strl 中

@ /kernel/msm-4.14/drivers/media/platform/msm/camera_v2/sensor/msm_sensor_driver.c
/* static function definition */
int32_t msm_sensor_driver_probe(void *setting,struct msm_sensor_info_t *probed_info, char *entity_name)
{
	/* Allocate memory for slave info */
	slave_info = kzalloc(sizeof(*slave_info), GFP_KERNEL);
	{
		// 1. 获取上层下发的slave_info 信息。
		copy_from_user(slave_info, (void __user *)setting, sizeof(*slave_info));
		id_info = &(slave_info->sensor_id_info);
		reg_setting = kzalloc(id_info->setting.size * (sizeof(struct msm_camera_i2c_reg_array)), GFP_KERNEL);
		copy_from_user(reg_setting, (void __user *) slave_info->sensor_id_info.setting.reg_setting,
				slave_info->sensor_id_info.setting.size * sizeof(struct msm_camera_i2c_reg_array));
		slave_info->sensor_id_info.setting.reg_setting = reg_setting;
	}
	/* Print slave info */
	CDBG("camera id %d Slave addr 0x%X addr_type %d\n",
		slave_info->camera_id, slave_info->slave_addr,
		slave_info->addr_type);
	CDBG("sensor_id_reg_addr 0x%X sensor_id 0x%X sensor id mask %d",
		slave_info->sensor_id_info.sensor_id_reg_addr,
		slave_info->sensor_id_info.sensor_id,
		slave_info->sensor_id_info.sensor_id_mask);
	CDBG("power up size %d power down size %d\n",
		slave_info->power_setting_array.size,
		slave_info->power_setting_array.size_down);
	CDBG("position %d",
		slave_info->sensor_init_params.position);
	CDBG("mount %d",
		slave_info->sensor_init_params.sensor_mount_angle);
	CDBG("bypass video node creation %d",
		slave_info->bypass_video_node_creation);
// 2. 根据camera id 获取该camera 的控制函数
/* Extract s_ctrl from camera id */
s_ctrl = g_sctrl[slave_info->camera_id];
CDBG("s_ctrl[%d] %pK", slave_info->camera_id, s_ctrl);
// 3. 如果已经probe 过了，则更新 probed_info 信息
if (s_ctrl->is_probe_succeed == 1) {
	/* Different sensor on this camera slot has been connected
	 * and probe already succeeded for that sensor. Ignore this probe */
	if (slave_info->sensor_id_info.sensor_id == s_ctrl->sensordata->cam_slave_info->sensor_id_info.sensor_id 
		&& !(strcmp(slave_info->sensor_name,s_ctrl->sensordata->cam_slave_info->sensor_name))) {
		pr_err("slot%d: sensor name: %s sensor id%d already probed\n",
			slave_info->camera_id,
			slave_info->sensor_name,
			s_ctrl->sensordata->cam_slave_info
			->sensor_id_info.sensor_id);
			
		msm_sensor_fill_sensor_info(s_ctrl,	probed_info, entity_name);
	} 
	rc = 0;
	goto free_slave_info;
}

// 4.获取 power 上下电信息
rc = msm_sensor_get_power_settings(setting, slave_info, &s_ctrl->sensordata->power_info);

// 5. 保存 Camera_info 结构体，包括 slave_addr，sensor id, setting
camera_info = kzalloc(sizeof(struct msm_camera_slave_info), GFP_KERNEL);
s_ctrl->sensordata->slave_info = camera_info;

/* Fill sensor slave info */
camera_info->sensor_slave_addr = slave_info->slave_addr;
camera_info->sensor_id_reg_addr = slave_info->sensor_id_info.sensor_id_reg_addr;
camera_info->sensor_id = slave_info->sensor_id_info.sensor_id;
camera_info->sensor_id_mask = slave_info->sensor_id_info.sensor_id_mask;
camera_info->setting = &(slave_info->sensor_id_info.setting);

/* Fill sensor address type */
s_ctrl->sensor_i2c_client->addr_type = slave_info->addr_type;
if (s_ctrl->sensor_i2c_client->client)
	s_ctrl->sensor_i2c_client->client->addr = camera_info->sensor_slave_addr;

cci_client = s_ctrl->sensor_i2c_client->cci_client;

cci_client->cci_i2c_master = s_ctrl->cci_i2c_master;
cci_client->sid = slave_info->slave_addr >> 1;
cci_client->retries = 3;
cci_client->id_map = 0;
cci_client->i2c_freq_mode = slave_info->i2c_freq_mode;

// 6. 填充上电信息
/* Parse and fill vreg params for powerup settings */
rc = msm_camera_fill_vreg_params(
	s_ctrl->sensordata->power_info.cam_vreg,
	s_ctrl->sensordata->power_info.num_vreg,
	s_ctrl->sensordata->power_info.power_setting,
	s_ctrl->sensordata->power_info.power_setting_size);
// 7. 填充下电信息
/* Parse and fill vreg params for powerdown settings*/
rc = msm_camera_fill_vreg_params(
	s_ctrl->sensordata->power_info.cam_vreg,
	s_ctrl->sensordata->power_info.num_vreg,
	s_ctrl->sensordata->power_info.power_down_setting,
	s_ctrl->sensordata->power_info.power_down_setting_size);

CSID_TG:
/* Update sensor, actuator and eeprom name in
* sensor control structure
/
// 8. 更新外设设备信息
s_ctrl->sensordata->sensor_name = slave_info->sensor_name;
s_ctrl->sensordata->eeprom_name = slave_info->eeprom_name;
s_ctrl->sensordata->actuator_name = slave_info->actuator_name;
s_ctrl->sensordata->ois_name = slave_info->ois_name;
s_ctrl->sensordata->flash_name = slave_info->flash_name;
// 9. 解析eeprom、actuator、flash 等的dts 信息
/ Update eeporm subdevice Id by input eeprom name /
rc = msm_sensor_fill_eeprom_subdevid_by_name(s_ctrl);
/ Update actuator subdevice Id by input actuator name */
rc = msm_sensor_fill_actuator_subdevid_by_name(s_ctrl);
rc = msm_sensor_fill_laser_led_subdevid_by_name(s_ctrl);
rc = msm_sensor_fill_ois_subdevid_by_name(s_ctrl);
rc = msm_sensor_fill_flash_subdevid_by_name(s_ctrl);

// 10. 开始上电，上电后会进行check_id 操作，如果 sensor id 匹配成功，则返回成功，
/* Power up and probe sensor */
rc = s_ctrl->func_tbl->sensor_power_up(s_ctrl);
========================>
+	@ /kernel/msm-4.14/drivers/media/platform/msm/camera_v2/sensor/msm_sensor.c
+	static struct msm_sensor_fn_t msm_sensor_func_tbl = {
+		.sensor_config = msm_sensor_config,
+		.sensor_power_up = msm_sensor_power_up,
+		.sensor_power_down = msm_sensor_power_down,
+		.sensor_match_id = msm_sensor_match_id,
+	};
+	
+	rc = msm_camera_power_up(power_info, s_ctrl->sensor_device_type, sensor_i2c_client);
+	rc = msm_sensor_check_id(s_ctrl);
<========================
pr_err("%s probe succeeded", slave_info->sensor_name);

s_ctrl->bypass_video_node_creation = slave_info->bypass_video_node_creation;

/*
 * Create /dev/videoX node, comment for now until dummy /dev/videoX
 * node is created and used by HAL
 */
// 11. 将sensor 加加载到V4L2 subdev 中，创建 节点 /dev/videoX
if (s_ctrl->sensor_device_type == MSM_CAMERA_PLATFORM_DEVICE)
	rc = msm_sensor_driver_create_v4l_subdev(s_ctrl);
else
	rc = msm_sensor_driver_create_i2c_v4l_subdev(s_ctrl);

// 12. 下电，保存 sensor_info 信息到 s_strl 中。
/* Power down */
s_ctrl->func_tbl->sensor_power_down(s_ctrl);

rc = msm_sensor_fill_slave_info_init_params(slave_info, s_ctrl->sensordata->sensor_info);
rc = msm_sensor_validate_slave_info(s_ctrl->sensordata->sensor_info);

/*Save sensor info*/
s_ctrl->sensordata->cam_slave_info = slave_info;
msm_sensor_fill_sensor_info(s_ctrl, probed_info, entity_name);
/*
 * Set probe succeeded flag to 1 so that no other camera shall
 * probed on this slot
 */
s_ctrl->is_probe_succeed = 1;
return rc;

}

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2.1.1 创建 /dev/videoX、 /dev/v4l-subdevX 节点

1. 创建 /dev/videoX 节点
2. 初始化 s_ctrl->msm_sd.sd 节构体信息，将ops 绑定到 sd 中
3. 更新 subdev 信息，并注册subdev
4. 将 subdev 添回到 subdev list 链表中
5. 创建 /dev/v4l-subdevX 节点

@ msm-4.14/drivers/media/platform/msm/camera_v2/sensor/msm_sensor_driver.c
static int32_t msm_sensor_driver_create_v4l_subdev(struct msm_sensor_ctrl_t *s_ctrl)
{
	// 1. 创建 /dev/videoX 字付设备节点
	if (s_ctrl->bypass_video_node_creation == 0) {
		rc = camera_init_v4l2(&s_ctrl->pdev->dev, &session_id);
		=============>
		+	@ msm-4.14/drivers/media/platform/msm/camera_v2/camera/camera.c
		+	strlcpy(pvdev->vdev->name, "msm-sensor", sizeof(pvdev->vdev->name));
		+	pvdev->vdev->fops     = &camera_v4l2_fops;
		+	pvdev->vdev->ioctl_ops = &camera_v4l2_ioctl_ops;
		+	video_register_device(pvdev->vdev,VFL_TYPE_GRABBER, -1);
		+	----------------->
		+		@ msm-4.14/include/media/v4l2-dev.h
		+		__video_register_device(vdev, type, nr, 1, vdev->fops->owner);
		+		------------>
		+			name_base = "video";
		+			/* Pick a device node number */
		+			minor_offset = 0;
		+			minor_cnt = 64;
		+			nr = devnode_find(vdev, 0, minor_cnt);
		+			video_device[vdev->minor] = vdev;
		+			/* Part 3: Initialize the character device */
		+			vdev->cdev->ops = &v4l2_fops;
		+			vdev->cdev->owner = owner;
		+			ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1);
		+			/* Part 4: register the device with sysfs */
		+			vdev->dev.class = &video_class;
		+			vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor);
		+			vdev->dev.parent = vdev->dev_parent;
		+			dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num);
		+			ret = device_register(&vdev->dev);
		+		<------------
		+	<-----------------
		<=============
	}
CDBG("rc %d session_id %d", rc, session_id);
s_ctrl->sensordata->sensor_info->session_id = session_id;

// 2. 初始化 s_ctrl->msm_sd.sd 节构体信息，将ops 绑定到 sd 中
/* Create /dev/v4l-subdevX device */
v4l2_subdev_init(&s_ctrl->msm_sd.sd, s_ctrl->sensor_v4l2_subdev_ops);
// 3. 更新 subdev 信息，并注册
// imx258
snprintf(s_ctrl->msm_sd.sd.name, sizeof(s_ctrl->msm_sd.sd.name), "%s",
	s_ctrl->sensordata->sensor_name);
v4l2_set_subdevdata(&s_ctrl->msm_sd.sd, s_ctrl->pdev);
s_ctrl->msm_sd.sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
media_entity_pads_init(&s_ctrl->msm_sd.sd.entity, 0, NULL);
s_ctrl->msm_sd.sd.entity.function = MSM_CAMERA_SUBDEV_SENSOR;
s_ctrl->msm_sd.sd.entity.name = s_ctrl->msm_sd.sd.name;    // imx258
s_ctrl->msm_sd.close_seq = MSM_SD_CLOSE_2ND_CATEGORY | 0x3;
rc = msm_sd_register(&s_ctrl->msm_sd);
=======================>
	@ msm-4.14/drivers/media/platform/msm/camera_v2/msm.c
	__msm_sd_register_subdev(&msm_subdev->sd);
	----------->
		// 3.1 将 subdev 添回到  subdev list 链表中
		rc = v4l2_device_register_subdev(msm_v4l2_dev, sd);
		--------->
			list_add_tail(&sd->list, &v4l2_dev->subdevs);
		<---------
		strlcpy(vdev->name, sd->name, sizeof(vdev->name));	// imx258
		vdev->v4l2_dev = msm_v4l2_dev;
		vdev->fops = msm_cam_get_v4l2_subdev_fops_ptr();
		vdev->release = msm_sd_unregister_subdev;
		// 3.2 创建 /dev/v4l-subdevX 节点
		rc = __video_register_device(vdev, VFL_TYPE_SUBDEV, -1, 1,sd->owner);
		--------->
			@ msm-4.14/drivers/media/v4l2-core/v4l2-dev.c
			name_base = "v4l-subdev";
			minor_offset = 128;
			minor_cnt = 64;
			/* Pick a device node number */
			nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt);
			video_device[vdev->minor] = vdev;
			/* Part 3: Initialize the character device */
			vdev->cdev->ops = &v4l2_fops;
			vdev->cdev->owner = owner;
			ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1);
			/* Part 4: register the device with sysfs */
			vdev->dev.class = &video_class;
			vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor);
			vdev->dev.parent = vdev->dev_parent;
			dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num); // v4l-subdevX
			ret = device_register(&vdev->dev);
		<---------
	<-----------
<=======================

msm_cam_copy_v4l2_subdev_fops(&msm_sensor_v4l2_subdev_fops);

#ifdef CONFIG_COMPAT
msm_sensor_v4l2_subdev_fops.compat_ioctl32 = msm_sensor_subdev_fops_ioctl;
#endif
s_ctrl->msm_sd.sd.devnode->fops = &msm_sensor_v4l2_subdev_fops;

return rc;

}

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至此，整个probe 过程就 完毕了。