概述
（1）源码参考
本篇文章实作环境是：调试效果或debug sensor register时需要动态读写sensor寄存器应该怎样修改代码？
目前参考的代码是Kernel-4.19，具体每个kernel版本可能都差不多，这里我们只看Main Sensor。
//kernel-4.19/drivers/misc/mediatek/imgsensor/src/common/v1/imgsensor_proc.c
enum IMGSENSOR_RETURN imgsensor_proc_init(void)
{
memset(mtk_ccm_name, 0, camera_info_size);
//proc/driver/下创建相关的节点
proc_create("driver/camsensor", 0664, NULL, &fcamera_proc_fops);
proc_create("driver/camsensor2", 0664, NULL, &fcamera_proc_fops2);
proc_create("driver/camsensor3", 0664, NULL, &fcamera_proc_fops3);
proc_create("driver/camsensor4", 0664, NULL, &fcamera_proc_fops4);
proc_create(
"driver/pdaf_type", 0664, NULL, &fcamera_proc_fops_set_pdaf_type);
proc_create(PROC_SENSOR_STAT, 0664, NULL, &fcamera_proc_fops_status);
/* Camera information */
proc_create(PROC_CAMERA_INFO, 0664, NULL, &fcamera_proc_fops1);
return IMGSENSOR_RETURN_SUCCESS;
}
//proc/driver/camsensor节点
static const struct file_operations fcamera_proc_fops = {
.owner = THIS_MODULE,
.read = seq_read,
.open = proc_camsensor_open,
.write = CAMERA_HW_Reg_Debug
};
/************************************************************************
* CAMERA_HW_Reg_Debug()
* Used for sensor register read/write by proc file
************************************************************************/
static ssize_t CAMERA_HW_Reg_Debug(
struct file *file,
const char *buffer,
size_t count,
loff_t *data)
{
char regBuf[64] = { ' ' };
int ret = 0;
u32 u4CopyBufSize =
(count < (sizeof(regBuf) - 1)) ? (count) : (sizeof(regBuf) - 1);
//表示后摄IMGSENSOR_SENSOR_IDX_MAIN
struct IMGSENSOR_SENSOR *psensor =
&pgimgsensor->sensor[IMGSENSOR_SENSOR_IDX_MAIN];
MSDK_SENSOR_REG_INFO_STRUCT sensorReg;
memset(&sensorReg, 0, sizeof(MSDK_SENSOR_REG_INFO_STRUCT));
if (psensor == NULL || copy_from_user(regBuf, buffer, u4CopyBufSize))
return -EFAULT;
//（1）读取到的输入regBuf
printk("dxf_hw1 regBuf = %sn",regBuf);
//（2）输入两个参数走的flow（write flow），将输入的regBuf提取赋值给RegAddr和RegData
if (sscanf(
regBuf,
"%x %x",
&sensorReg.RegAddr,
&sensorReg.RegData) == 2) {
imgsensor_sensor_feature_control(
psensor,
SENSOR_FEATURE_SET_REGISTER,
(MUINT8 *) &sensorReg,
(MUINT32 *) sizeof(MSDK_SENSOR_REG_INFO_STRUCT));
imgsensor_sensor_feature_control(
psensor, SENSOR_FEATURE_GET_REGISTER,
(MUINT8 *) &sensorReg,
(MUINT32 *) sizeof(MSDK_SENSOR_REG_INFO_STRUCT));
printk(
"write addr = 0x%08x, data = 0x%08xn",
sensorReg.RegAddr,
sensorReg.RegData);
ret = snprintf(
mtk_i2c_dump,
sizeof(mtk_i2c_dump),
"addr = 0x%08x, data = 0x%08xn",
sensorReg.RegAddr,
sensorReg.RegData);
printk("dxf_hw2 %s, ret = %dn",mtk_i2c_dump,ret);
if (ret == 0) {
pr_info("Error! snprintf allocate 0");
ret = IMGSENSOR_RETURN_ERROR;
return ret;
}
//（3）输入一个参数走的flow（read flow），将输入的regBuf提取赋值给RegAddr
} else if (kstrtouint(regBuf, 16, &sensorReg.RegAddr) == 0) {
imgsensor_sensor_feature_control(
psensor,
SENSOR_FEATURE_GET_REGISTER,
(MUINT8 *) &sensorReg,
(MUINT32 *) sizeof(MSDK_SENSOR_REG_INFO_STRUCT));
printk(
"read addr = 0x%08x, data = 0x%08xn",
sensorReg.RegAddr,
sensorReg.RegData);
ret = snprintf(
mtk_i2c_dump,
sizeof(mtk_i2c_dump),
"addr = 0x%08x, data = 0x%08xn",
sensorReg.RegAddr,
sensorReg.RegData);
printk("dxf_hw3 %s, ret = %dn",mtk_i2c_dump,ret);
if (ret == 0) {
pr_info("Error! snprintf allocate 0");
ret = IMGSENSOR_RETURN_ERROR;
return ret;
}
}
return count;
}
需要在对应的sensor drv（XXX_sensor.c）中正确实现相应的feature control。
static kal_uint32 feature_control(MSDK_SENSOR_FEATURE_ENUM feature_id,
UINT8 *feature_para,UINT32 *feature_para_len)
{
//...
switch (feature_id) {
case SENSOR_FEATURE_SET_REGISTER:
write_cmos_sensor(sensor_reg_data->RegAddr, sensor_reg_data->RegData);
break;
case SENSOR_FEATURE_GET_REGISTER:
sensor_reg_data->RegData = read_cmos_sensor(sensor_reg_data->RegAddr);
break;
}
//...
}
（2）函数解释
（A）sscanf
//C 库函数 int sscanf(const char *str, const char *format, ...) 从字符串读取格式化输入。
/*
str：待解析的字符串;
format：字符串格式描述;
返回值：如果成功，该函数返回成功匹配和赋值的个数。如果到达文件末尾或发生读错误，则返回 EOF。
*/
int sscanf(const char *str, const char *format, ...)
//示例
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
int day, year;
char weekday[20], month[20], dtm[100];
strcpy( dtm, "Saturday March 25 1989" );
sscanf( dtm, "%s %s %d %d", weekday, month, &day, &year );
printf("%s %d, %d = %sn", month, day, year, weekday );
return(0);
}
//结果
March 25, 1989 = Saturday
（B）snprintf
//C 库函数 int snprintf(char *str, size_t size, const char *format, ...) 设将可变参数(...)按照 format 格式化成字符串，并将字符串复制到 str 中，size 为要写入的字符的最大数目，超过 size 会被截断。
/*
str：目标字符串；
size：拷贝字节数(Bytes)；
format：格式化成字符串；
...：可变参数；
返回值：
1、如果格式化后的字符串长度小于 size，则会把字符串全部复制到 str 中，并给其后添加一个字符串结束符 ；
2、如果格式化后的字符串长度大于等于 size，超过 size 的部分会被截断，只将其中的 (size-1) 个字符复制到 str 中，并给其后添加一个字符串结束符 ，返回值为欲写入的字符串长度。
*/
int snprintf ( char * str, size_t size, const char * format, ... );
//示例
#include <stdio.h>
int main()
{
char buffer[50];
char* s = "runoobcom";
// 读取字符串并存储在 buffer 中
int j = snprintf(buffer, 6, "%sn", s);
// 输出 buffer及字符数
printf("string:n%sncharacter count = %dn", buffer, j);
return 0;
}
//结果
string:
runoo
character count = 10
（C）kstrtouint
//kstrtouint函数定义在文件kstrtox.c中
/*
s：输入字符串；
base：是10(10进制)或16(16进制),或者是0自动识别；
res：存放转换后的整形值；
返回值：当没有错误时返回值是0;
*/
int kstrtouint(const char *s, unsigned int base, unsigned int *res)
//示例
kstrtoint(receive_data, 16, &write_data);
（3）测试
这里以0x0202寄存器为例，进行读写操作。
//write addr
adb shell echo 0x0202 0x1234 > proc/driver/camsensor //将0x0202地址的值设置为0x1234
4,79095,1690141545,-; (7)[9410:sh]dxf_hw1 regBuf = 0x0202 0x1234x0a
4,79096,1690142202,-; (7)[9410:sh]write addr = 0x00000202, data = 0x00001234
4,79097,1690142427,-; (7)[9410:sh]dxf_hw2 addr = 0x00000202, data = 0x00001234x0a, ret = 37
//read addr
adb shell echo 0x0202 > proc/driver/camsensor //读取0x0202地址的值
4,79309,1691998102,-; (4)[9410:sh]dxf_hw1 regBuf = 0x0202x0a
4,79310,1691998599,-; (4)[9410:sh]read addr = 0x00000202, data = 0x00000860
4,79311,1691998641,-; (4)[9410:sh]dxf_hw3 addr = 0x00000202, data = 0x00000860x0a, ret = 37
顺便说明一下直接编译kernel生成boot.img的命令：
./prebuilts/build-tools/linux-x86/bin/ninja -f out/combined-full_xxx.ninja bootimage
最后
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