From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3AD7736C5B0; Thu, 20 Nov 2025 17:04:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763658270; cv=none; b=FZIWh2G8StLe8n+sSn4k32qOtnxM/qGOa3ldjEmhl2TBvLRdqlGSuUYBP145Nb5MkClSriL1ZcEQUiw6yQgweVPNMfSksknNw6sadYivzgnsVxpUINhnnusT3LtFa5R4sNQEuNCoHZ6N899/xVtO75F1n+4b9QC3GxRlj1fzfN4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763658270; c=relaxed/simple; bh=gf/2PytGf+/O37DduiJXYf79VDU4tRhpcB0pc74cBcE=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=LOy3Txp1Jx5+esdhPkyeCvbZidwrum4WUoN1x6H4hsEPOj++o/4B7jlOufDzQzbxksXc7ORIG39DVjHzXusElowYyf4Ox9zIMUuavE8jvoQayUf5itNwJF5oP4fFOunR2qXgTVtASebIQmIRhgEO/ZGCr0CNVzFUVF9S/25DRQw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=gvjUWul4; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="gvjUWul4" Received: by smtp.kernel.org (Postfix) with ESMTPS id CFA38C4CEF1; Thu, 20 Nov 2025 17:04:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux.dev; s=korg; t=1763658269; bh=gf/2PytGf+/O37DduiJXYf79VDU4tRhpcB0pc74cBcE=; h=From:Subject:Date:To:Cc:From; b=gvjUWul4R+qo9IHi/2vypIBLV9zd0ddFAwNYuTO6E0rvreWjHA1Kqklb2RYgG8glq N0AoMt/NfL/jWxsuYGCLOS5CCPlKiS8ckSNOUMKPUGB3fDJ/J3TlT2YLGfTsT4C5Jx VKoaPgkzrlkdKICJdZRY9dEBhumvQUneVXwTaJxg= Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id BC3A2CF8549; Thu, 20 Nov 2025 17:04:29 +0000 (UTC) From: Richard Leitner Subject: [PATCH v9 0/8] Add strobe duration and strobe output enable v4l2 ctrl Date: Thu, 20 Nov 2025 18:04:20 +0100 Message-Id: <20251120-ov9282-flash-strobe-v9-0-6c9e3a4301d7@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-B4-Tracking: v=1; b=H4sIABRKH2kC/33R207DMAwG4FeZck2m2Dk1u+I9EBdpDizSWCHpo qFp707WSRSqjsvfsj9b8oWUkFMoZLe5kBxqKmk4tmCeNsTt7fEt0ORbJshQMs44HarBDmk82LK nZcxDH6h1qveMOeODIm3yI4eYzpP68nrPOXyeGj7ei6S3JVA3vL+ncbepagsdzU6QW/M+lXHIX 9NFFabuf5dXoIyy6KW2IJXo7fMhHU/nrQ918ir+MkCsG9gMEF5b7IAL9EuDz4ZAs27wZiAw6QJ oYyQuDTEbkul1QzRDY4/GOOi1M0tDzoaCB4ZshtEKvdXCMyWXhpoNDWrdUDeDiwhoQ4ycLw09G 4bBuqGb4WXnpVVG2OiWRvdjALAHf+ma0RvwMURwSv757fV6/QbsgeqavwIAAA== X-Change-ID: 20250303-ov9282-flash-strobe-ac6bd00c9de6 To: Sakari Ailus , Dave Stevenson , Mauro Carvalho Chehab , Lee Jones , Pavel Machek , Laurent Pinchart Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org, Richard Leitner , Hans Verkuil X-Mailer: b4 0.15-dev-a3fc8 X-Developer-Signature: v=1; a=ed25519-sha256; t=1763658268; l=4829; i=richard.leitner@linux.dev; s=20250225; h=from:subject:message-id; bh=gf/2PytGf+/O37DduiJXYf79VDU4tRhpcB0pc74cBcE=; b=H8Df9pIn3RD7Y8tRSJmJKAAHG4fPsVKYvuw7weipecm8QIYh63oRo8r2yYjDuKGipEnlWjTr2 XEEqF1HdONHBN3a0PJnSK5I8N54z9kqNGwANCOGPMGcV55Ta0Ld+S6k X-Developer-Key: i=richard.leitner@linux.dev; a=ed25519; pk=8hZNyyyQFqZ5ruVJsSGBSPIrmJpfDm5HwHU4QVOP1Pk= X-Endpoint-Received: by B4 Relay for richard.leitner@linux.dev/20250225 with auth_id=350 This series adds two new v4l2 controls: - V4L2_CID_FLASH_DURATION: "Strobe duration": This control enables setting a desired flash/strobe length/duration in µs. - V4L2_CID_FLASH_STROBE_OE: "Strobe output enable": This control enables the hardware strobe output signal of a v4l2 device. As a first user of these new controls add basic flash/strobe support for ov9282 sensors using their "hardware strobe output". The duration calculation is only interpolated from various measurements, as no documentation was found. Further flash/strobe-related controls as well as a migration to v4l2-cci helpers for ov9282 will likely be implemented in future series. All register addresses/values are based on the OV9281 datasheet v1.53 (january 2019). This series was tested using an ov9281 VisionComponents camera module. Signed-off-by: Richard Leitner --- Changes in v9: - Avoid needless multiplication/division in ov9282.c (Thanks Sakari) - Avoid possible u32 overflow in ov9282.c (Thanks Sakari) - Link to v8: https://patch.msgid.link/20251104-ov9282-flash-strobe-v8-0-b91dfef1c65a@linux.dev Changes in v8: - Minor styling changes across the set - Add missing error handling for ov9282 strobe_frame_span writing - Rename V4L2_CID_FLASH_HW_STROBE_SIGNAL to V4L2_CID_FLASH_STROBE_OE - Drop 02/10: FLASH_DURATION handling in v4l2-flash - Drop 08/10: strobe_source in ov9282 - Link to v7: https://lore.kernel.org/r/20250901-ov9282-flash-strobe-v7-0-d58d5a694afc@linux.dev Changes in v7: - Improved v4l2 uAPI documentation (thanks Sakari) - Link to v6: https://lore.kernel.org/r/20250716-ov9282-flash-strobe-v6-0-934f12aeff33@linux.dev Changes in v6: - Fix "Alignment should match open parenthesis" by Media-CI bot in v4l2-flash-led-class.c - Fix "format string contains non-ascii character (µ)" by Media-CI bot in ov9282.c - Introduce new V4L2_CID_FLASH_HW_STROBE_SIGNAL control (as suggested by Sakari) - Implement V4L2_CID_FLASH_HW_STROBE_SIGNAL instead of V4L2_CID_FLASH_LED_MODE in ov9282.c (as suggested by Sakari) - Drop "media: v4l2-flash: fix flash_timeout comment" as this was applied (thanks Lee) - Link to v5: https://lore.kernel.org/r/20250617-ov9282-flash-strobe-v5-0-9762da74d065@linux.dev Changes in v5: - Improve try_ctrl for flash_duration by using DIV_ROUND_UP() and abs() (thanks Sakari) - Drop "leds: flash: Add support for flash/strobe duration" as this was applied upstream - Add "media: i2c: ov9282: dynamic flash_duration maximum" (thanks Sakari) - Link to v4: https://lore.kernel.org/r/20250507-ov9282-flash-strobe-v4-0-72b299c1b7c9@linux.dev Changes in v4: - Fix FLASH_DURATION implementation in v4l2-flash-led-class.c by adding a missing brace and enum entry (thanks Sakari) - Fix format of multiline comment in ov9282.c (thanks Sakari) - Add missing NULL check in ov9282.c (thanks Sakari) - Adapt nr_of_controls_hint for v4l2 handler in ov9282.c (thanks Sakari) - Add patch for implementing try_ctrl for strobe_duration (thanks Sakari) - Link to v3: https://lore.kernel.org/r/20250429-ov9282-flash-strobe-v3-0-2105ce179952@linux.dev Changes in v3: - create separate patch for leds driver changes (thanks Lee) - Link to v2: https://lore.kernel.org/r/20250314-ov9282-flash-strobe-v2-0-14d7a281342d@linux.dev Changes in v2: - remove not needed controls in struct ov9282 (thanks Dave) - Fix commit message of 3/3 regarding framerate get/set (thanks Dave) - Add V4L2_CID_FLASH_STROBE_SOURCE impementation to ov9282 - Add new V4L2_CID_FLASH_DURATION control (as suggested by Laurent) - Use FLASH_DURATION instead of FLASH_TIMEOUT for ov9282 - Link to v1: https://lore.kernel.org/r/20250303-ov9282-flash-strobe-v1-0-0fd57a1564ba@linux.dev --- Richard Leitner (8): media: v4l: ctrls: add a control for flash/strobe duration media: v4l: ctrls: add a control for enabling strobe output Documentation: uAPI: media: add V4L2_CID_FLASH_{DURATION,STROBE_OE} media: i2c: ov9282: add output enable register definitions media: i2c: ov9282: add strobe output enable v4l2 control media: i2c: ov9282: add strobe_duration v4l2 control media: i2c: ov9282: implement try_ctrl for strobe_duration media: i2c: ov9282: dynamic flash_duration maximum .../userspace-api/media/v4l/ext-ctrls-flash.rst | 42 ++++++ drivers/media/i2c/ov9282.c | 165 ++++++++++++++++++++- drivers/media/v4l2-core/v4l2-ctrls-defs.c | 3 + include/uapi/linux/v4l2-controls.h | 2 + 4 files changed, 206 insertions(+), 6 deletions(-) --- base-commit: 2f112b1c25da9f5346c2261ed35c5b1e0b906471 change-id: 20250303-ov9282-flash-strobe-ac6bd00c9de6 Best regards, -- Richard Leitner