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Date: Sun, 26 Jun 2011 19:55:24 +0200 From: Hans Verkuil <hverkuil@...all.nl> To: Mauro Carvalho Chehab <mchehab@...hat.com>, Linux Media Mailing List <linux-media@...r.kernel.org> Cc: LKML <linux-kernel@...r.kernel.org>, Laurent Pincart <laurent.pinchart@...asonboard.com>, Mike Isely <isely@...ly.net> Subject: Re: [PATCH 00/14] Remove linux/version.h from most drivers/media On Sunday, June 26, 2011 18:06:20 Mauro Carvalho Chehab wrote: > At the V4L2 API, one of the fields of VIDIOC_QUERYCAP requires the usage > of KERNEL_VERSION macro, in order to provide the driver version. However, > this is not handled consistently across subsystems. There are very few > drivers that take it seriously. > > So, instead of the current way, let's replace it by a subsystem version. > Removing the driver-specific version reported via V4L2 API is a good > thing, due to several reasons: > 1) every time include/linux/version.h changes, all media drivers > need to be recompiled; > 2) eventually, this macro will be changed at Kernel 3.x; > 3) developers are lazy on updating it at a per-driver basis; > The information there is not consistent; > 4) a check for the V4L2 API, incremented as new changes are added > means that the changes will happen on a consistent way, being > incremented when new features are added at the Kernel; > 5) From time to time, people do the wrong thing, including version.h > where it is not needed, and spending Kernel Janitor's time to > cleanup the mess. > > There's one additional reason for the change: before this patch series, > a call to an unsupported ioctl would be returning -EINVAL. So, userspace > applications can't detect if the error were due to invalid parameters, > or to unsupported ioctl. This series changes the behavior to return > -ENOIOCTLCMD for non-supported ioctl's. > > So, after this patch series, if VIDIOC_QUERYCAP returns version 3.x.y, > userspace applications can rely on -ENOIOCTLCMD in order to detect that > an ioctl is not supported by a given driver. > > After this patch series, the only places at drivers/media that will keep > linux/version.h are: > drivers/media/video/et61x251/et61x251_core.c > drivers/media/video/pvrusb2/pvrusb2-v4l2.c > drivers/media/video/sn9c102/sn9c102_core.c > drivers/media/video/uvc/uvc_driver.c > drivers/media/video/uvc/uvc_v4l2.c > And, of course: drivers/media/video/v4l2-ioctl.c > > The rationale is that et61x251, pvrusb2, sn9c102 and uvc uses the > legacy way of handling ioctl's. Two of those drivers are obsoleted by > gspca. The other two drivers (pvrusb2 and uvc) needs porting. Except for the ENOIOCTLCMD changes: Acked-by: Hans Verkuil <hans.verkuil@...co.com> I suggest that the ENOIOCTLCMD changes are in a separate patch series due to the uncertainty of what the right return code is. Also, while it would be great to have a different ioctl than EINVAL for unsupported ioctls, I am afraid of breaking existing applications. Some may rely on this. Regards, Hans > > Mauro Carvalho Chehab (14): > [media] v4l2 core: return -ENOIOCTLCMD if an ioctl doesn't exist > [media] return -ENOIOCTLCMD for unsupported ioctl's at legacy drivers > [media] v4l2-ioctl: Add a default value for kernel version > [media] drxd, siano: Remove unused include linux/version.h > [media] Stop using linux/version.h on most video drivers > [media] pwc: Use the default version for VIDIOC_QUERYCAP > [media] ivtv,cx18: Use default version control for VIDIOC_QUERYCAP > [media] et61x251: Use LINUX_VERSION_CODE for VIDIOC_QUERYCAP > [media] pvrusb2: Use LINUX_VERSION_CODE for VIDIOC_QUERYCAP > [media] sn9c102: Use LINUX_VERSION_CODE for VIDIOC_QUERYCAP > [media] uvcvideo: Use LINUX_VERSION_CODE for VIDIOC_QUERYCAP > [media] Stop using linux/version.h the remaining video drivers > [media] radio: Use the subsystem version control for VIDIOC_QUERYCAP > [media] DocBook/v4l: Document the new system-wide version behavior > > Documentation/DocBook/media/Makefile | 1 + > Documentation/DocBook/media/v4l/common.xml | 10 ++++++++- > Documentation/DocBook/media/v4l/func-ioctl.xml | 17 ++++++++------- > Documentation/DocBook/media/v4l/v4l2.xml | 7 ++++++ > .../DocBook/media/v4l/vidioc-querycap.xml | 15 ++++++++----- > drivers/media/dvb/frontends/drxd_hard.c | 1 - > drivers/media/dvb/siano/smscoreapi.h | 1 - > drivers/media/radio/dsbr100.c | 7 +---- > drivers/media/radio/radio-aimslab.c | 5 +--- > drivers/media/radio/radio-aztech.c | 5 +--- > drivers/media/radio/radio-cadet.c | 5 +--- > drivers/media/radio/radio-gemtek.c | 7 +---- > drivers/media/radio/radio-maxiradio.c | 10 +++----- > drivers/media/radio/radio-mr800.c | 6 +--- > drivers/media/radio/radio-rtrack2.c | 5 +--- > drivers/media/radio/radio-sf16fmi.c | 5 +--- > drivers/media/radio/radio-tea5764.c | 6 +--- > drivers/media/radio/radio-terratec.c | 5 +--- > drivers/media/radio/radio-timb.c | 3 +- > drivers/media/radio/radio-trust.c | 5 +--- > drivers/media/radio/radio-typhoon.c | 9 +++---- > drivers/media/radio/radio-zoltrix.c | 5 +--- > drivers/media/radio/si470x/radio-si470x-i2c.c | 4 +-- > drivers/media/radio/si470x/radio-si470x-usb.c | 2 - > drivers/media/radio/si470x/radio-si470x.h | 1 - > drivers/media/radio/wl128x/fmdrv.h | 5 +--- > drivers/media/radio/wl128x/fmdrv_v4l2.c | 1 - > drivers/media/video/arv.c | 5 +-- > drivers/media/video/au0828/au0828-core.c | 1 + > drivers/media/video/au0828/au0828-video.c | 5 ---- > drivers/media/video/bt8xx/bttv-driver.c | 14 +++--------- > drivers/media/video/bt8xx/bttvp.h | 3 -- > drivers/media/video/bw-qcam.c | 3 +- > drivers/media/video/c-qcam.c | 3 +- > drivers/media/video/cpia2/cpia2.h | 5 ---- > drivers/media/video/cpia2/cpia2_v4l.c | 12 +++------- > drivers/media/video/cx18/cx18-driver.h | 1 - > drivers/media/video/cx18/cx18-ioctl.c | 1 - > drivers/media/video/cx18/cx18-version.h | 8 +------ > drivers/media/video/cx231xx/cx231xx-video.c | 14 +++--------- > drivers/media/video/cx231xx/cx231xx.h | 1 - > drivers/media/video/cx23885/altera-ci.c | 1 - > drivers/media/video/cx23885/cx23885-417.c | 1 - > drivers/media/video/cx23885/cx23885-core.c | 13 ++--------- > drivers/media/video/cx23885/cx23885-video.c | 1 - > drivers/media/video/cx23885/cx23885.h | 3 +- > drivers/media/video/cx88/cx88-alsa.c | 19 +++-------------- > drivers/media/video/cx88/cx88-blackbird.c | 20 ++---------------- > drivers/media/video/cx88/cx88-dvb.c | 18 ++-------------- > drivers/media/video/cx88/cx88-mpeg.c | 11 ++------- > drivers/media/video/cx88/cx88-video.c | 21 ++----------------- > drivers/media/video/cx88/cx88.h | 4 +- > drivers/media/video/davinci/vpif_capture.c | 9 ++----- > drivers/media/video/davinci/vpif_capture.h | 7 +----- > drivers/media/video/davinci/vpif_display.c | 9 ++----- > drivers/media/video/davinci/vpif_display.h | 8 +------ > drivers/media/video/em28xx/em28xx-video.c | 14 ++++-------- > drivers/media/video/et61x251/et61x251.h | 1 - > drivers/media/video/et61x251/et61x251_core.c | 16 +++----------- > drivers/media/video/fsl-viu.c | 10 +------- > drivers/media/video/gspca/gl860/gl860.h | 1 - > drivers/media/video/gspca/gspca.c | 12 +++------- > drivers/media/video/hdpvr/hdpvr-core.c | 1 + > drivers/media/video/hdpvr/hdpvr-video.c | 2 - > drivers/media/video/hdpvr/hdpvr.h | 6 ----- > drivers/media/video/ivtv/ivtv-driver.h | 1 - > drivers/media/video/ivtv/ivtv-ioctl.c | 1 - > drivers/media/video/ivtv/ivtv-version.h | 7 +----- > drivers/media/video/m5mols/m5mols_capture.c | 2 - > drivers/media/video/m5mols/m5mols_core.c | 1 - > drivers/media/video/mem2mem_testdev.c | 4 +-- > drivers/media/video/mx1_camera.c | 5 +-- > drivers/media/video/mx2_camera.c | 5 +-- > drivers/media/video/mx3_camera.c | 3 +- > drivers/media/video/omap1_camera.c | 5 +-- > drivers/media/video/omap24xxcam.c | 5 +-- > drivers/media/video/omap3isp/isp.c | 1 + > drivers/media/video/omap3isp/ispvideo.c | 1 - > drivers/media/video/omap3isp/ispvideo.h | 3 +- > drivers/media/video/pms.c | 4 +-- > drivers/media/video/pvrusb2/pvrusb2-main.c | 1 + > drivers/media/video/pvrusb2/pvrusb2-v4l2.c | 9 +------ > drivers/media/video/pwc/pwc-ioctl.h | 1 - > drivers/media/video/pwc/pwc-v4l.c | 1 - > drivers/media/video/pwc/pwc.h | 7 +----- > drivers/media/video/pxa_camera.c | 5 +-- > drivers/media/video/s2255drv.c | 15 +++---------- > drivers/media/video/s5p-fimc/fimc-capture.c | 2 - > drivers/media/video/s5p-fimc/fimc-core.c | 3 +- > drivers/media/video/saa7134/saa7134-core.c | 12 +++------- > drivers/media/video/saa7134/saa7134-empress.c | 1 - > drivers/media/video/saa7134/saa7134-video.c | 2 - > drivers/media/video/saa7134/saa7134.h | 3 +- > drivers/media/video/saa7164/saa7164.h | 1 - > drivers/media/video/sh_mobile_ceu_camera.c | 3 +- > drivers/media/video/sh_vou.c | 3 +- > drivers/media/video/sn9c102/sn9c102.h | 1 - > drivers/media/video/sn9c102/sn9c102_core.c | 16 +++----------- > drivers/media/video/timblogiw.c | 1 - > drivers/media/video/tlg2300/pd-common.h | 1 - > drivers/media/video/tlg2300/pd-main.c | 1 + > drivers/media/video/tlg2300/pd-radio.c | 2 - > drivers/media/video/usbvision/usbvision-video.c | 12 +---------- > drivers/media/video/uvc/uvc_driver.c | 3 +- > drivers/media/video/uvc/uvc_v4l2.c | 4 +- > drivers/media/video/uvc/uvcvideo.h | 3 +- > drivers/media/video/v4l2-ioctl.c | 6 +++- > drivers/media/video/vino.c | 5 +--- > drivers/media/video/vivi.c | 14 +++--------- > drivers/media/video/w9966.c | 4 +-- > drivers/media/video/zoran/zoran.h | 4 --- > drivers/media/video/zoran/zoran_card.c | 7 ++++- > drivers/media/video/zoran/zoran_driver.c | 3 -- > drivers/media/video/zr364xx.c | 6 +--- > 114 files changed, 186 insertions(+), 461 deletions(-) > > -- > To unsubscribe from this list: send the line "unsubscribe linux-media" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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