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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平臺 Android 10.0】Camera Sensor lib 與 Kernel Camera Probe 代碼分析

一、libmmcamera_imx258.so 代碼分析
- 1.1 struct sensor_lib_t 結構體
- 1.2 imx258_lib.h 頭文件分析
二、 Kernel Camera Probe 代碼分析
- 2.1 msm_sensor_driver_probe() 代碼分析
- - 2.1.1 創(chuàng)建 /dev/videoX、 /dev/v4l-subdevX 節(jié)點

《【高通SDM660平臺】(1) — Camera 驅動 Bringup Guide》
《【高通SDM660平臺】(2) — Camera Kernel 驅動層代碼邏輯分析》
《【高通SDM660平臺】(3) — Camera V4L2 驅動層分析》
《【高通SDM660平臺】(4) — Camera Init 初始化流程》
《【高通SDM660平臺】(5) — Camera Open 流程》
《【高通SDM660平臺】(6) — Camera getParameters 及 setParameters 流程》
《【高通SDM660平臺】(7) — Camera onPreview 代碼流程》
《【高通SDM660平臺】(8) — Camera MetaData介紹》
《【高通SDM660平臺 Android 10.0】(9) — Qcom Camera Daemon 代碼分析》
《【高通SDM660平臺 Android 10.0】(10) — Camera Sensor lib 與 Kernel Camera Probe 代碼分析》
《【高通SDM660平臺】Camera Capture 流程》
《【高通SDM660平臺】Camera mm-qcamera-app 代碼分析》

在前面《【高通SDM660平臺 Android 10.0】Qcom Camera Daemon 代碼分析》中，
我們分析了 Camera module_sensor_init() 的整個過程，考慮到篇幅的問題，本文是接module_sensor_init() 繼續(xù)分析的。
主題如下：

分析 Camera lib 庫的代碼

vendor 下發(fā) CFG_SINIT_PROBE 后，Kernel 中 Camera Probe的流程

好, 開始吧！

一、libmmcamera_imx258.so 代碼分析

Sensor LIB 庫代碼位于 /vendor/qcom/proprietary/mm-camera/mm-camera2/media-controller/modules/sensors/sensor/libs
本文以 imx258 為例。

先來看下imx258_lib.c，其最核心的函數就是 sensor_open_lib，
返回 sensor_lib_ptr 結構體，所有的 Camera 信息，都保存在該結構體中。

@ /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;
}

我們來看下 sensor_lib_ptr 結構體的定義

1.1 struct sensor_lib_t 結構體

@ /vendor/qcom/proprietary/mm-camerasdk/sensor/includes/sensor_lib.h typedef struct {/* sensor slave info */ // 從設備包括，I2C地址、I2C速率、Sensor_id 寄存器地址及Sensor_id 值、上下電的時序及電壓值struct camera_sensor_slave_info sensor_slave_info;

/* sensor output settings */
// 包括出圖的格式（BAYER / YCbCr）, 連接類型為 MIPI CSI
sensor_output_t sensor_output;

/* sensor output register address */
// 輸出寄存器的地址，pclk，及l(fā)ine 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 前丟棄過的幀數
unsigned short sensor_num_frame_skip;

/* number of frames to skip after start HDR stream info */
// HDR 丟棄的幀數
unsigned short sensor_num_HDR_frame_skip;

/* sensor pipeline delay */
// pipeline 幀延時
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 */
// 像素點大小，寬高
sensor_imaging_pixel_array_size pixel_array_size_info;

/* Sensor color level information */
// 顏色等級
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;
// 關閉Camera 時的寄存器配置
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 /
// 測試圖信息
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;

// 不同辨率的輸出信息，xy像素大小，pclk,fps，數據傳輸速率
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 配軒
pdaf_lib_t pdaf_config;

/* sensor orientation flag */
sensor_orientation_type_t sensor_orientation;

} sensor_lib_t;

1.2 imx258_lib.h 頭文件分析

@ /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，對應的8位地址為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 */

二、 Kernel Camera Probe 代碼分析

前面我們 mm-camera/mm-camera2/media-controller/modules/sensors/module/sensor_init.c 中，會下發(fā) CFG_SINIT_PROBE 給到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);

Kernel 中處理的地方為：

@/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;

}

前面代碼中， cfg.setting 就是 cfg.cfg.setting = slave_info;，而最終probe 的結果，保存在 cfg->probed_info 中。

2.1 msm_sensor_driver_probe() 代碼分析

獲取上層下發(fā)的slave_info 信息

根據camera id 獲取該camera 的控制函數

如果已經probe 過了，則更新 probed_info 信息

獲取 power 上下電信息

保存 Camera_info 結構體，包括 slave_addr，sensor id, setting

填充上電信息

填充下電信息

更新外設設備信息

解析eeprom、actuator、flash 等的dts 信息

開始上電，上電后會進行check_id 操作，如果 sensor id 匹配成功，則返回成功

將sensor 加加載到V4L2 subdev 中，創(chuàng)建節(jié)點 /dev/videoX

下電，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. 獲取上層下發(fā)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. 根據camera id 獲取該camera 的控制函數 /* 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. 如果已經probe 過了，則更新 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.獲取 power 上下電信息 rc = msm_sensor_get_power_settings(setting, slave_info, &s_ctrl->sensordata->power_info);// 5. 保存 Camera_info 結構體，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. 填充上電信息 /* 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. 填充下電信息 /* 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. 更新外設設備信息
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. 開始上電，上電后會進行check_id 操作，如果 sensor id 匹配成功，則返回成功， /* 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. 將sensor 加加載到V4L2 subdev 中，創(chuàng)建節(jié)點 /dev/videoX if (s_ctrl->sensor_device_type == MSM_CAMERA_PLATFORM_DEVICE)rc = msm_sensor_driver_create_v4l_subdev(s_ctrl); elserc = msm_sensor_driver_create_i2c_v4l_subdev(s_ctrl);// 12. 下電，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;

}

2.1.1 創(chuàng)建 /dev/videoX、 /dev/v4l-subdevX 節(jié)點

創(chuàng)建 /dev/videoX 節(jié)點

初始化 s_ctrl->msm_sd.sd 節(jié)構體信息，將ops 綁定到 sd 中

更新 subdev 信息，并注冊subdev

將 subdev 添回到 subdev list 鏈表中

創(chuàng)建 /dev/v4l-subdevX 節(jié)點

@ 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. 創(chuàng)建 /dev/videoX 字付設備節(jié)點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 節(jié)構體信息，將ops 綁定到 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，并注冊 // 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 將 subdev 添回到 subdev list 鏈表中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)); // imx258vdev->v4l2_dev = msm_v4l2_dev;vdev->fops = msm_cam_get_v4l2_subdev_fops_ptr();vdev->release = msm_sd_unregister_subdev;// 3.2 創(chuàng)建 /dev/v4l-subdevX 節(jié)點rc = __video_register_device(vdev, VFL_TYPE_SUBDEV, -1, 1,sd->owner);--------->@ msm-4.14/drivers/media/v4l2-core/v4l2-dev.cname_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-subdevXret = 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;

}

至此，整個probe 過程就完畢了。

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