linux-kernel - [PATCH 2/4] media: uvcvideo: Add UVC_QUIRK_LIMITED

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Date:   Thu, 19 May 2022 17:40:57 +0200
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tomasz Figa <tfiga@...omium.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Yunke Cao <yunkec@...gle.com>
Cc:     Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH 2/4] media: uvcvideo: Add UVC_QUIRK_LIMITED_POWERLINE

Add a quirk for devices that only support a limited set of Power Line
frequencies.

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 27 +++++++++++++++++++++++++++
 drivers/media/usb/uvc/uvcvideo.h |  1 +
 2 files changed, 28 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 13cad4aa7573..ffa103789ef9 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -369,6 +369,11 @@ static const struct uvc_menu_info power_line_frequency_controls[] = {
 	{ 3, "Auto" },
 };
 
+static const struct uvc_menu_info power_line_frequency_controls_limited[] = {
+	{ 1, "50 Hz" },
+	{ 2, "60 Hz" },
+};
+
 static const struct uvc_menu_info exposure_auto_controls[] = {
 	{ 2, "Auto Mode" },
 	{ 1, "Manual Mode" },
@@ -731,6 +736,19 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 };
 
+static const
+struct uvc_control_mapping power_line_mapping_limited = {
+	.id		= V4L2_CID_POWER_LINE_FREQUENCY,
+	.entity		= UVC_GUID_UVC_PROCESSING,
+	.selector	= UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
+	.size		= 2,
+	.offset		= 0,
+	.v4l2_type	= V4L2_CTRL_TYPE_MENU,
+	.data_type	= UVC_CTRL_DATA_TYPE_ENUM,
+	.menu_info	= power_line_frequency_controls_limited,
+	.menu_count	= ARRAY_SIZE(power_line_frequency_controls_limited),
+};
+
 /* ------------------------------------------------------------------------
  * Utility functions
  */
@@ -2406,6 +2424,15 @@ static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain,
 	if (!ctrl->initialized)
 		return;
 
+	if (chain->dev->quirks & UVC_QUIRK_LIMITED_POWERLINE &&
+	    ctrl->info.selector == power_line_mapping_limited.selector &&
+	    uvc_entity_match_guid(ctrl->entity,
+				  power_line_mapping_limited.entity)) {
+		__uvc_ctrl_add_mapping(chain, ctrl,
+				       &power_line_mapping_limited);
+		return;
+	}
+
 	for (; mapping < mend; ++mapping) {
 		if (uvc_entity_match_guid(ctrl->entity, mapping->entity) &&
 		    ctrl->info.selector == mapping->selector)
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 143230b3275b..06779eb4f5fa 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -209,6 +209,7 @@
 #define UVC_QUIRK_RESTORE_CTRLS_ON_INIT	0x00000400
 #define UVC_QUIRK_FORCE_Y8		0x00000800
 #define UVC_QUIRK_FORCE_BPP		0x00001000
+#define UVC_QUIRK_LIMITED_POWERLINE     0x00002000
 
 /* Format flags */
 #define UVC_FMT_FLAG_COMPRESSED		0x00000001
-- 
2.36.1.124.g0e6072fb45-goog