Hi tuukka, Chip identification could be used for many other camera devices. Not only for SMIA compatible sensors. It could be used for generic camera devices I guess for any other reasons, like checking chip version on factory assembly line in mass production. Something like G_CHIP_IDENT (as Hans mentioned) should be cool. Cheers, Nate On Wed, Mar 4, 2009 at 11:12 PM, Tuukka.O Toivonen <tuukka.o.toivonen@xxxxxxxxx> wrote: > Hi, > > I am writing a generic driver for SMIA-compatible sensors. > SMIA-sensors have registers containing: > u16 model_id > u16 revision_number > u8 manufacturer_id > which could be used to detect the sensor. > However, since the driver is generic, it is not interested > of these values. > > Nevertheless, in some cases user space applications want > to know the exact chip. For example, to get the highest > possible image quality, user space application might capture > an image and postprocess it using sensor-specific filtering > algorithms (which don't belong into kernel driver). > > I am planning to export the chip identification information > to user space using VIDIOC_DBG_G_CHIP_IDENT. > Here's a sketch: > #define V4L2_IDENT_SMIA_BASE (0x53 << 24) > then in sensor driver's VIDIOC_DBG_G_CHIP_IDENT ioctl handler: > struct v4l2_dbg_chip_ident id; > id.ident = V4L2_IDENT_SMIA_BASE | (manufacturer_id << 16) | model_id; > id.revision = revision_number; > > Do you think this is acceptable? > > Alternatively, VIDIOC_QUERYCAP could be used to identify the sensor. > Would it make more sense if it would return something like > capability.card: `omap3/smia-sensor-12-1234-5678//' > where 12 would be manufacturer_id, 1234 model_id, and > 5678 revision_number? > > I'll start writing a patch as soon as you let me know > which would be the best alternative. Thanks! > > - Tuukka > -- > To unsubscribe from this list: send the line "unsubscribe linux-media" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- ======================================================== DongSoo(Nathaniel), Kim Engineer Mobile S/W Platform Lab. S/W centre Telecommunication R&D Centre Samsung Electronics CO., LTD. e-mail : dongsoo.kim@xxxxxxxxx dongsoo45.kim@xxxxxxxxxxx ======================================================== -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
