MTK ISP 分析

vendor/mediatek/PRoprietary/hardware/mtkcam/legacy/platform/mt6735m/core/drv/isp/isp_drv.cpp  

通过Ioctl 控制到kernel-3.18/drivers/misc/mediatek/cameraisp/src/mt6735/camera_isp_D2.c 

#define ISP_RESET           _IO(ISP_MAGIC, ISP_CMD_RESET)#define ISP_RESET_BUF       _IO(ISP_MAGIC, ISP_CMD_RESET_BUF)#define ISP_READ_REGISTER   _IOWR(ISP_MAGIC, ISP_CMD_READ_REG,      ISP_REG_IO_STRUCT)#define ISP_WRITE_REGISTER  _IOWR(ISP_MAGIC, ISP_CMD_WRITE_REG,     ISP_REG_IO_STRUCT)#define ISP_HOLD_REG_TIME   _IOW(ISP_MAGIC, ISP_CMD_HOLD_TIME,     ISP_HOLD_TIME_ENUM)#define ISP_HOLD_REG        _IOW(ISP_MAGIC, ISP_CMD_HOLD_REG,      bool)#define ISP_WAIT_IRQ        _IOW(ISP_MAGIC, ISP_CMD_WAIT_IRQ,      ISP_WAIT_IRQ_STRUCT)#define ISP_READ_IRQ        _IOR(ISP_MAGIC, ISP_CMD_READ_IRQ,      ISP_READ_IRQ_STRUCT)#define ISP_CLEAR_IRQ       _IOW(ISP_MAGIC, ISP_CMD_CLEAR_IRQ,     ISP_CLEAR_IRQ_STRUCT)#define ISP_DUMP_REG        _IO(ISP_MAGIC, ISP_CMD_DUMP_REG)#define ISP_SET_USER_PID    _IOW(ISP_MAGIC, ISP_CMD_SET_USER_PID,  unsigned long)#define ISP_BUFFER_CTRL     _IOWR(ISP_MAGIC, ISP_CMD_RT_BUF_CTRL,   ISP_BUFFER_CTRL_STRUCT)#define ISP_REF_CNT_CTRL    _IOWR(ISP_MAGIC, ISP_CMD_REF_CNT,       ISP_REF_CNT_CTRL_STRUCT)#define ISP_DEBUG_FLAG      _IOW(ISP_MAGIC, ISP_CMD_DEBUG_FLAG,    unsigned long)#define ISP_WAKELOCK_CTRL   _IOWR(ISP_MAGIC, ISP_CMD_WAKELOCK_CTRL, unsigned long)#define ISP_SENSOR_FREQ_CTRL  _IOW(ISP_MAGIC, ISP_CMD_SENSOR_FREQ_CTRL, unsigned long)