On Fri, Jul 15, 2022 at 12:36:18PM +0300, Laurent Pinchart wrote: > Hello, > > CC'ing Benjamin Mugnier who I recall expressed an interest in ToF > sensors (if I recall incorrectly, my apologies). > > On Fri, Jul 15, 2022 at 11:57:20AM +0300, Volodymyr Kharuk wrote: > > On Thu, Jul 14, 2022 at 01:31:35PM +0300, Laurent Pinchart wrote: > > > On Thu, Jul 14, 2022 at 11:34:46AM +0300, Volodymyr Kharuk wrote: > > > > Define user controls for mlx7502x driver and update MAINTAINERS > > > > > > > > Signed-off-by: Volodymyr Kharuk <vkh@xxxxxxxxxxx> > > > > --- > > > > MAINTAINERS | 7 +++++++ > > > > include/uapi/linux/mlx7502x.h | 31 +++++++++++++++++++++++++++++++ > > > > 2 files changed, 38 insertions(+) > > > > create mode 100644 include/uapi/linux/mlx7502x.h > > > > > > > > diff --git a/MAINTAINERS b/MAINTAINERS > > > > index ef3ec334fae9..1a68d888ee14 100644 > > > > --- a/MAINTAINERS > > > > +++ b/MAINTAINERS > > > > @@ -12673,6 +12673,13 @@ S: Supported > > > > W: http://www.melexis.com > > > > F: drivers/iio/temperature/mlx90632.c > > > > > > > > +MELEXIS MLX7502X DRIVER > > > > +M: Volodymyr Kharuk <vkh@xxxxxxxxxxx> > > > > +L: linux-media@xxxxxxxxxxxxxxx > > > > +S: Supported > > > > +W: http://www.melexis.com > > > > +F: include/uapi/linux/mlx7502x.h > > > > + > > > > MELFAS MIP4 TOUCHSCREEN DRIVER > > > > M: Sangwon Jee <jeesw@xxxxxxxxxx> > > > > S: Supported > > > > diff --git a/include/uapi/linux/mlx7502x.h b/include/uapi/linux/mlx7502x.h > > > > new file mode 100644 > > > > index 000000000000..44386f3d6f5a > > > > --- /dev/null > > > > +++ b/include/uapi/linux/mlx7502x.h > > > > @@ -0,0 +1,31 @@ > > > > +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ > > > > +/* > > > > + * Melexis 7502x ToF cameras driver. > > > > + * > > > > + * Copyright (C) 2021 Melexis N.V. > > > > + * > > > > + */ > > > > + > > > > +#ifndef __UAPI_MLX7502X_H_ > > > > +#define __UAPI_MLX7502X_H_ > > > > + > > > > +#include <linux/v4l2-controls.h> > > > > + > > > > > > These controls should be documented, in > > > Documentation/userspace-api/media/drivers/. > > > > Ok, will do in v3 > > > > > > +/* number of phases per frame: 1..8 */ > > > > +#define V4L2_CID_MLX7502X_PHASE_NUMBER (V4L2_CID_USER_MLX7502X_BASE + 0) > > > > +/* shift of each phase in frame, this is an array of 8 elements, each 16bits */ > > > > +#define V4L2_CID_MLX7502X_PHASE_SEQ (V4L2_CID_USER_MLX7502X_BASE + 1) > > > > +/* frequency modulation in MHz */ > > > > +#define V4L2_CID_MLX7502X_FMOD (V4L2_CID_USER_MLX7502X_BASE + 2) > > > > +/* time integration of each phase in us */ > > > > +#define V4L2_CID_MLX7502X_TINT (V4L2_CID_USER_MLX7502X_BASE + 3) > > > > > > Are these control very device-specific, or are they concept that apply > > > in general to ToF sensors ? Same for V4L2_CID_MLX7502X_OUTPUT_MODE. > > > > These controls(except V4L2_CID_MLX7502X_OUTPUT_MODE) are general for ToF > > sensors. Do you think we should standardize them? > > I would really really like to see control standardization for ToF > sensors, yes :-) Sounds great :) > > Do you know of any public litterature that explains the operating > principles of ToF sensors ? I don't expect most of the V4L2 developers > to be familiar with the concept, so something that could bring us up to > speed on ToF would be useful for the discussion. Here what I have: 1. ToF Basics from Melexis https://media.melexis.com/-/media/files/documents/application-notes/time-of-flight-basics-application-note-melexis.pdf 2. ToF Basics from TI https://www.ti.com/lit/wp/sloa190b/sloa190b.pdf?ts=1657842732275&ref_url=https%253A%252F%252Fwww.google.com%252F 2. ToF systems from TI https://www.ti.com/lit/ug/sbau219d/sbau219d.pdf 4. This more related to ToF algorithms https://hal.inria.fr/hal-00725654/document I hope it helps. > > > Note that the control V4L2_CID_MLX7502X_TINT is similar to > > V4L2_CID_EXPOSURE, but the way it is done in ToF is different. They don't > > have a shutter. So I gave a separate control name. Is it ok? > > Yes, I think that's fine. > > > > > +/* mode could sw(sending i2c packet), hw(pin triggering), and continuous(self triggering) */ > > > > +#define V4L2_CID_MLX7502X_TRIGGER_MODE (V4L2_CID_USER_MLX7502X_BASE + 4) > > > > +/* in case sw or hw trigger mode is used */ > > > > +#define V4L2_CID_MLX7502X_TRIGGER (V4L2_CID_USER_MLX7502X_BASE + 5) > > > > > > Trigger control is likely something we need to standardize at the V4L2 > > > level. > > > > Ok, then I'll remove these controls for now and I will back with this as > > a separate patch. > > > > > > +/* this is related to the taps in ToF cameras, usually A minus B is the best option */ > > > > +#define V4L2_CID_MLX7502X_OUTPUT_MODE (V4L2_CID_USER_MLX7502X_BASE + 6) > > > > +/* ToF camers has its own temperature sensor, which can be read out only during streaming */ > > > > +#define V4L2_CID_MLX7502X_TEMPERATURE (V4L2_CID_USER_MLX7502X_BASE + 7) > > > > > > This should probably use the proposed temperature control from > > > https://lore.kernel.org/linux-media/20220415111845.27130-3-benjamin.mugnier@xxxxxxxxxxx/ > > > > Ok, then I'll remove these controls for now. > > > > > > + > > > > +#endif /* __UAPI_MLX7502X_H_ */ > > -- > Regards, > > Laurent Pinchart -- -- Volodymyr Kharuk
