14ad97bfbSSakari Ailus.. SPDX-License-Identifier: GPL-2.0-only OR BSD-3-Clause 24ad97bfbSSakari Ailus 34ad97bfbSSakari Ailus.. include:: <isonum.txt> 44ad97bfbSSakari Ailus 54ad97bfbSSakari AilusMIPI CCS camera sensor driver 64ad97bfbSSakari Ailus============================= 74ad97bfbSSakari Ailus 84ad97bfbSSakari AilusThe MIPI CCS camera sensor driver is a generic driver for `MIPI CCS 94ad97bfbSSakari Ailus<https://www.mipi.org/specifications/camera-command-set>`_ compliant 104ad97bfbSSakari Ailuscamera sensors. It exposes three sub-devices representing the pixel array, 114ad97bfbSSakari Ailusthe binner and the scaler. 124ad97bfbSSakari Ailus 134ad97bfbSSakari AilusAs the capabilities of individual devices vary, the driver exposes 144ad97bfbSSakari Ailusinterfaces based on the capabilities that exist in hardware. 154ad97bfbSSakari Ailus 164ad97bfbSSakari AilusPixel Array sub-device 174ad97bfbSSakari Ailus---------------------- 184ad97bfbSSakari Ailus 194ad97bfbSSakari AilusThe pixel array sub-device represents the camera sensor's pixel matrix, as well 204ad97bfbSSakari Ailusas analogue crop functionality present in many compliant devices. The analogue 214ad97bfbSSakari Ailuscrop is configured using the ``V4L2_SEL_TGT_CROP`` on the source pad (0) of the 224ad97bfbSSakari Ailusentity. The size of the pixel matrix can be obtained by getting the 234ad97bfbSSakari Ailus``V4L2_SEL_TGT_NATIVE_SIZE`` target. 244ad97bfbSSakari Ailus 254ad97bfbSSakari AilusBinner 264ad97bfbSSakari Ailus------ 274ad97bfbSSakari Ailus 284ad97bfbSSakari AilusThe binner sub-device represents the binning functionality on the sensor. For 294ad97bfbSSakari Ailusthat purpose, selection target ``V4L2_SEL_TGT_COMPOSE`` is supported on the 304ad97bfbSSakari Ailussink pad (0). 314ad97bfbSSakari Ailus 324ad97bfbSSakari AilusAdditionally, if a device has no scaler or digital crop functionality, the 334ad97bfbSSakari Ailussource pad (1) expses another digital crop selection rectangle that can only 344ad97bfbSSakari Ailuscrop at the end of the lines and frames. 354ad97bfbSSakari Ailus 364ad97bfbSSakari AilusScaler 374ad97bfbSSakari Ailus------ 384ad97bfbSSakari Ailus 394ad97bfbSSakari AilusThe scaler sub-device represents the digital crop and scaling functionality of 404ad97bfbSSakari Ailusthe sensor. The V4L2 selection target ``V4L2_SEL_TGT_CROP`` is used to 414ad97bfbSSakari Ailusconfigure the digital crop on the sink pad (0) when digital crop is supported. 424ad97bfbSSakari AilusScaling is configured using selection target ``V4L2_SEL_TGT_COMPOSE`` on the 434ad97bfbSSakari Ailussink pad (0) as well. 444ad97bfbSSakari Ailus 454ad97bfbSSakari AilusAdditionally, if the scaler sub-device exists, its source pad (1) exposes 464ad97bfbSSakari Ailusanother digital crop selection rectangle that can only crop at the end of the 474ad97bfbSSakari Ailuslines and frames. 484ad97bfbSSakari Ailus 494ad97bfbSSakari AilusDigital and analogue crop 504ad97bfbSSakari Ailus------------------------- 514ad97bfbSSakari Ailus 524ad97bfbSSakari AilusDigital crop functionality is referred to as cropping that effectively works by 534ad97bfbSSakari Ailusdropping some data on the floor. Analogue crop, on the other hand, means that 544ad97bfbSSakari Ailusthe cropped information is never retrieved. In case of camera sensors, the 554ad97bfbSSakari Ailusanalogue data is never read from the pixel matrix that are outside the 564ad97bfbSSakari Ailusconfigured selection rectangle that designates crop. The difference has an 574ad97bfbSSakari Ailuseffect in device timing and likely also in power consumption. 584ad97bfbSSakari Ailus 594ad97bfbSSakari AilusRegister definition generator 604ad97bfbSSakari Ailus----------------------------- 614ad97bfbSSakari Ailus 62*3bf10ebcSSakari AilusThe ccs-regs.asc file contains MIPI CCS register definitions that are used 634ad97bfbSSakari Ailusto produce C source code files for definitions that can be better used by 644ad97bfbSSakari Ailusprograms written in C language. As there are many dependencies between the 654ad97bfbSSakari Ailusproduced files, please do not modify them manually as it's error-prone and 664ad97bfbSSakari Ailusin vain, but instead change the script producing them. 674ad97bfbSSakari Ailus 684ad97bfbSSakari AilusUsage 694ad97bfbSSakari Ailus~~~~~ 704ad97bfbSSakari Ailus 714ad97bfbSSakari AilusConventionally the script is called this way to update the CCS driver 724ad97bfbSSakari Ailusdefinitions: 734ad97bfbSSakari Ailus 744ad97bfbSSakari Ailus.. code-block:: none 754ad97bfbSSakari Ailus 764ad97bfbSSakari Ailus $ Documentation/driver-api/media/drivers/ccs/mk-ccs-regs -k \ 774ad97bfbSSakari Ailus -e drivers/media/i2c/ccs/ccs-regs.h \ 784ad97bfbSSakari Ailus -L drivers/media/i2c/ccs/ccs-limits.h \ 794ad97bfbSSakari Ailus -l drivers/media/i2c/ccs/ccs-limits.c \ 80*3bf10ebcSSakari Ailus -c Documentation/driver-api/media/drivers/ccs/ccs-regs.asc 814ad97bfbSSakari Ailus 824ad97bfbSSakari Ailus**Copyright** |copy| 2020 Intel Corporation 83