// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* uvc_ctrl.c -- USB Video Class driver - Controls
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*
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* Copyright (C) 2005-2010
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* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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*/
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/usb.h>
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#include <linux/videodev2.h>
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#include <linux/vmalloc.h>
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#include <linux/wait.h>
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#include <linux/workqueue.h>
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#include <linux/atomic.h>
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#include <media/v4l2-ctrls.h>
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#include "uvcvideo.h"
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#define UVC_CTRL_DATA_CURRENT 0
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#define UVC_CTRL_DATA_BACKUP 1
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#define UVC_CTRL_DATA_MIN 2
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#define UVC_CTRL_DATA_MAX 3
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#define UVC_CTRL_DATA_RES 4
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#define UVC_CTRL_DATA_DEF 5
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#define UVC_CTRL_DATA_LAST 6
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/* ------------------------------------------------------------------------
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* Controls
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*/
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static const struct uvc_control_info uvc_ctrls[] = {
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_BRIGHTNESS_CONTROL,
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.index = 0,
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.size = 2,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_CONTRAST_CONTROL,
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.index = 1,
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.size = 2,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_HUE_CONTROL,
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.index = 2,
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.size = 2,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE
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| UVC_CTRL_FLAG_AUTO_UPDATE,
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},
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_SATURATION_CONTROL,
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.index = 3,
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.size = 2,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_SHARPNESS_CONTROL,
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.index = 4,
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.size = 2,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_GAMMA_CONTROL,
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.index = 5,
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.size = 2,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
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.index = 6,
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.size = 2,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE
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| UVC_CTRL_FLAG_AUTO_UPDATE,
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},
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL,
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.index = 7,
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.size = 4,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE
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| UVC_CTRL_FLAG_AUTO_UPDATE,
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},
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_BACKLIGHT_COMPENSATION_CONTROL,
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.index = 8,
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.size = 2,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_GAIN_CONTROL,
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.index = 9,
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.size = 2,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
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.index = 10,
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.size = 1,
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.flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
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| UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_HUE_AUTO_CONTROL,
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.index = 11,
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.size = 1,
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.flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
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| UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
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.index = 12,
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.size = 1,
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.flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
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| UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
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.index = 13,
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.size = 1,
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.flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
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| UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_DIGITAL_MULTIPLIER_CONTROL,
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.index = 14,
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.size = 2,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_DIGITAL_MULTIPLIER_LIMIT_CONTROL,
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.index = 15,
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.size = 2,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_ANALOG_VIDEO_STANDARD_CONTROL,
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.index = 16,
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.size = 1,
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.flags = UVC_CTRL_FLAG_GET_CUR,
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},
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{
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_ANALOG_LOCK_STATUS_CONTROL,
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.index = 17,
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.size = 1,
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.flags = UVC_CTRL_FLAG_GET_CUR,
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},
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{
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.entity = UVC_GUID_UVC_CAMERA,
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.selector = UVC_CT_SCANNING_MODE_CONTROL,
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.index = 0,
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.size = 1,
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.flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
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| UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_CAMERA,
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.selector = UVC_CT_AE_MODE_CONTROL,
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.index = 1,
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.size = 1,
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.flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
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| UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_GET_RES
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| UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_CAMERA,
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.selector = UVC_CT_AE_PRIORITY_CONTROL,
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.index = 2,
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.size = 1,
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.flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
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| UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_CAMERA,
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.selector = UVC_CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
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.index = 3,
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.size = 4,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE
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| UVC_CTRL_FLAG_AUTO_UPDATE,
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},
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{
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.entity = UVC_GUID_UVC_CAMERA,
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.selector = UVC_CT_EXPOSURE_TIME_RELATIVE_CONTROL,
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.index = 4,
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.size = 1,
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.flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_CAMERA,
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.selector = UVC_CT_FOCUS_ABSOLUTE_CONTROL,
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.index = 5,
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.size = 2,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE
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| UVC_CTRL_FLAG_AUTO_UPDATE,
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},
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{
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.entity = UVC_GUID_UVC_CAMERA,
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.selector = UVC_CT_FOCUS_RELATIVE_CONTROL,
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.index = 6,
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.size = 2,
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.flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_MIN
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| UVC_CTRL_FLAG_GET_MAX | UVC_CTRL_FLAG_GET_RES
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| UVC_CTRL_FLAG_GET_DEF
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| UVC_CTRL_FLAG_AUTO_UPDATE,
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},
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{
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.entity = UVC_GUID_UVC_CAMERA,
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.selector = UVC_CT_IRIS_ABSOLUTE_CONTROL,
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.index = 7,
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.size = 2,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE
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| UVC_CTRL_FLAG_AUTO_UPDATE,
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},
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{
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.entity = UVC_GUID_UVC_CAMERA,
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.selector = UVC_CT_IRIS_RELATIVE_CONTROL,
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.index = 8,
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.size = 1,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_AUTO_UPDATE,
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},
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{
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.entity = UVC_GUID_UVC_CAMERA,
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.selector = UVC_CT_ZOOM_ABSOLUTE_CONTROL,
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.index = 9,
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.size = 2,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE
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| UVC_CTRL_FLAG_AUTO_UPDATE,
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},
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{
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.entity = UVC_GUID_UVC_CAMERA,
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.selector = UVC_CT_ZOOM_RELATIVE_CONTROL,
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.index = 10,
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.size = 3,
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.flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_MIN
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| UVC_CTRL_FLAG_GET_MAX | UVC_CTRL_FLAG_GET_RES
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| UVC_CTRL_FLAG_GET_DEF
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| UVC_CTRL_FLAG_AUTO_UPDATE,
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},
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{
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.entity = UVC_GUID_UVC_CAMERA,
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.selector = UVC_CT_PANTILT_ABSOLUTE_CONTROL,
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.index = 11,
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.size = 8,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE
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| UVC_CTRL_FLAG_AUTO_UPDATE,
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},
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{
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.entity = UVC_GUID_UVC_CAMERA,
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.selector = UVC_CT_PANTILT_RELATIVE_CONTROL,
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.index = 12,
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.size = 4,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_AUTO_UPDATE,
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},
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{
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.entity = UVC_GUID_UVC_CAMERA,
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.selector = UVC_CT_ROLL_ABSOLUTE_CONTROL,
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.index = 13,
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.size = 2,
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.flags = UVC_CTRL_FLAG_SET_CUR
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| UVC_CTRL_FLAG_GET_RANGE
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| UVC_CTRL_FLAG_RESTORE
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| UVC_CTRL_FLAG_AUTO_UPDATE,
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},
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{
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.entity = UVC_GUID_UVC_CAMERA,
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.selector = UVC_CT_ROLL_RELATIVE_CONTROL,
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.index = 14,
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.size = 2,
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.flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_MIN
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| UVC_CTRL_FLAG_GET_MAX | UVC_CTRL_FLAG_GET_RES
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| UVC_CTRL_FLAG_GET_DEF
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| UVC_CTRL_FLAG_AUTO_UPDATE,
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},
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{
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.entity = UVC_GUID_UVC_CAMERA,
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.selector = UVC_CT_FOCUS_AUTO_CONTROL,
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.index = 17,
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.size = 1,
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.flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
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| UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE,
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},
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{
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.entity = UVC_GUID_UVC_CAMERA,
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.selector = UVC_CT_PRIVACY_CONTROL,
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.index = 18,
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.size = 1,
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.flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
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| UVC_CTRL_FLAG_RESTORE
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| UVC_CTRL_FLAG_AUTO_UPDATE,
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},
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};
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static const struct uvc_menu_info power_line_frequency_controls[] = {
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{ 0, "Disabled" },
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{ 1, "50 Hz" },
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{ 2, "60 Hz" },
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};
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static const struct uvc_menu_info exposure_auto_controls[] = {
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{ 2, "Auto Mode" },
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{ 1, "Manual Mode" },
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{ 4, "Shutter Priority Mode" },
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{ 8, "Aperture Priority Mode" },
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};
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static s32 uvc_ctrl_get_zoom(struct uvc_control_mapping *mapping,
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u8 query, const u8 *data)
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{
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s8 zoom = (s8)data[0];
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switch (query) {
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case UVC_GET_CUR:
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return (zoom == 0) ? 0 : (zoom > 0 ? data[2] : -data[2]);
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case UVC_GET_MIN:
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case UVC_GET_MAX:
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case UVC_GET_RES:
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case UVC_GET_DEF:
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default:
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return data[2];
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}
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}
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static void uvc_ctrl_set_zoom(struct uvc_control_mapping *mapping,
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s32 value, u8 *data)
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{
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data[0] = value == 0 ? 0 : (value > 0) ? 1 : 0xff;
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data[2] = min((int)abs(value), 0xff);
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}
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static s32 uvc_ctrl_get_rel_speed(struct uvc_control_mapping *mapping,
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u8 query, const u8 *data)
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{
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unsigned int first = mapping->offset / 8;
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s8 rel = (s8)data[first];
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switch (query) {
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case UVC_GET_CUR:
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return (rel == 0) ? 0 : (rel > 0 ? data[first+1]
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: -data[first+1]);
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case UVC_GET_MIN:
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return -data[first+1];
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case UVC_GET_MAX:
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case UVC_GET_RES:
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case UVC_GET_DEF:
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default:
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return data[first+1];
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}
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}
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static void uvc_ctrl_set_rel_speed(struct uvc_control_mapping *mapping,
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s32 value, u8 *data)
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{
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unsigned int first = mapping->offset / 8;
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data[first] = value == 0 ? 0 : (value > 0) ? 1 : 0xff;
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data[first+1] = min_t(int, abs(value), 0xff);
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}
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static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
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{
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.id = V4L2_CID_BRIGHTNESS,
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.name = "Brightness",
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_BRIGHTNESS_CONTROL,
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.size = 16,
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.offset = 0,
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.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
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.data_type = UVC_CTRL_DATA_TYPE_SIGNED,
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},
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{
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.id = V4L2_CID_CONTRAST,
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.name = "Contrast",
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_CONTRAST_CONTROL,
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.size = 16,
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.offset = 0,
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.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
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.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
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},
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{
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.id = V4L2_CID_HUE,
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.name = "Hue",
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_HUE_CONTROL,
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.size = 16,
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.offset = 0,
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.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
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.data_type = UVC_CTRL_DATA_TYPE_SIGNED,
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.master_id = V4L2_CID_HUE_AUTO,
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.master_manual = 0,
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},
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{
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.id = V4L2_CID_SATURATION,
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.name = "Saturation",
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_SATURATION_CONTROL,
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.size = 16,
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.offset = 0,
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.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
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.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
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},
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{
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.id = V4L2_CID_SHARPNESS,
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.name = "Sharpness",
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_SHARPNESS_CONTROL,
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.size = 16,
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.offset = 0,
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.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
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.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
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},
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{
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.id = V4L2_CID_GAMMA,
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.name = "Gamma",
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_GAMMA_CONTROL,
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.size = 16,
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.offset = 0,
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.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
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.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
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},
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{
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.id = V4L2_CID_BACKLIGHT_COMPENSATION,
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.name = "Backlight Compensation",
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_BACKLIGHT_COMPENSATION_CONTROL,
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.size = 16,
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.offset = 0,
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.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
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.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
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},
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{
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.id = V4L2_CID_GAIN,
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.name = "Gain",
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.entity = UVC_GUID_UVC_PROCESSING,
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.selector = UVC_PU_GAIN_CONTROL,
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.size = 16,
|
.offset = 0,
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.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
|
.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
|
},
|
{
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.id = V4L2_CID_POWER_LINE_FREQUENCY,
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.name = "Power Line Frequency",
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.entity = UVC_GUID_UVC_PROCESSING,
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.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,
|
.menu_count = ARRAY_SIZE(power_line_frequency_controls),
|
},
|
{
|
.id = V4L2_CID_HUE_AUTO,
|
.name = "Hue, Auto",
|
.entity = UVC_GUID_UVC_PROCESSING,
|
.selector = UVC_PU_HUE_AUTO_CONTROL,
|
.size = 1,
|
.offset = 0,
|
.v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
|
.data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
|
.slave_ids = { V4L2_CID_HUE, },
|
},
|
{
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.id = V4L2_CID_EXPOSURE_AUTO,
|
.name = "Exposure, Auto",
|
.entity = UVC_GUID_UVC_CAMERA,
|
.selector = UVC_CT_AE_MODE_CONTROL,
|
.size = 4,
|
.offset = 0,
|
.v4l2_type = V4L2_CTRL_TYPE_MENU,
|
.data_type = UVC_CTRL_DATA_TYPE_BITMASK,
|
.menu_info = exposure_auto_controls,
|
.menu_count = ARRAY_SIZE(exposure_auto_controls),
|
.slave_ids = { V4L2_CID_EXPOSURE_ABSOLUTE, },
|
},
|
{
|
.id = V4L2_CID_EXPOSURE_AUTO_PRIORITY,
|
.name = "Exposure, Auto Priority",
|
.entity = UVC_GUID_UVC_CAMERA,
|
.selector = UVC_CT_AE_PRIORITY_CONTROL,
|
.size = 1,
|
.offset = 0,
|
.v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
|
.data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
|
},
|
{
|
.id = V4L2_CID_EXPOSURE_ABSOLUTE,
|
.name = "Exposure (Absolute)",
|
.entity = UVC_GUID_UVC_CAMERA,
|
.selector = UVC_CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
|
.size = 32,
|
.offset = 0,
|
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
|
.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
|
.master_id = V4L2_CID_EXPOSURE_AUTO,
|
.master_manual = V4L2_EXPOSURE_MANUAL,
|
},
|
{
|
.id = V4L2_CID_AUTO_WHITE_BALANCE,
|
.name = "White Balance Temperature, Auto",
|
.entity = UVC_GUID_UVC_PROCESSING,
|
.selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
|
.size = 1,
|
.offset = 0,
|
.v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
|
.data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
|
.slave_ids = { V4L2_CID_WHITE_BALANCE_TEMPERATURE, },
|
},
|
{
|
.id = V4L2_CID_WHITE_BALANCE_TEMPERATURE,
|
.name = "White Balance Temperature",
|
.entity = UVC_GUID_UVC_PROCESSING,
|
.selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
|
.size = 16,
|
.offset = 0,
|
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
|
.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
|
.master_id = V4L2_CID_AUTO_WHITE_BALANCE,
|
.master_manual = 0,
|
},
|
{
|
.id = V4L2_CID_AUTO_WHITE_BALANCE,
|
.name = "White Balance Component, Auto",
|
.entity = UVC_GUID_UVC_PROCESSING,
|
.selector = UVC_PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
|
.size = 1,
|
.offset = 0,
|
.v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
|
.data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
|
.slave_ids = { V4L2_CID_BLUE_BALANCE,
|
V4L2_CID_RED_BALANCE },
|
},
|
{
|
.id = V4L2_CID_BLUE_BALANCE,
|
.name = "White Balance Blue Component",
|
.entity = UVC_GUID_UVC_PROCESSING,
|
.selector = UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL,
|
.size = 16,
|
.offset = 0,
|
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
|
.data_type = UVC_CTRL_DATA_TYPE_SIGNED,
|
.master_id = V4L2_CID_AUTO_WHITE_BALANCE,
|
.master_manual = 0,
|
},
|
{
|
.id = V4L2_CID_RED_BALANCE,
|
.name = "White Balance Red Component",
|
.entity = UVC_GUID_UVC_PROCESSING,
|
.selector = UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL,
|
.size = 16,
|
.offset = 16,
|
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
|
.data_type = UVC_CTRL_DATA_TYPE_SIGNED,
|
.master_id = V4L2_CID_AUTO_WHITE_BALANCE,
|
.master_manual = 0,
|
},
|
{
|
.id = V4L2_CID_FOCUS_ABSOLUTE,
|
.name = "Focus (absolute)",
|
.entity = UVC_GUID_UVC_CAMERA,
|
.selector = UVC_CT_FOCUS_ABSOLUTE_CONTROL,
|
.size = 16,
|
.offset = 0,
|
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
|
.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
|
.master_id = V4L2_CID_FOCUS_AUTO,
|
.master_manual = 0,
|
},
|
{
|
.id = V4L2_CID_FOCUS_AUTO,
|
.name = "Focus, Auto",
|
.entity = UVC_GUID_UVC_CAMERA,
|
.selector = UVC_CT_FOCUS_AUTO_CONTROL,
|
.size = 1,
|
.offset = 0,
|
.v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
|
.data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
|
.slave_ids = { V4L2_CID_FOCUS_ABSOLUTE, },
|
},
|
{
|
.id = V4L2_CID_IRIS_ABSOLUTE,
|
.name = "Iris, Absolute",
|
.entity = UVC_GUID_UVC_CAMERA,
|
.selector = UVC_CT_IRIS_ABSOLUTE_CONTROL,
|
.size = 16,
|
.offset = 0,
|
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
|
.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
|
},
|
{
|
.id = V4L2_CID_IRIS_RELATIVE,
|
.name = "Iris, Relative",
|
.entity = UVC_GUID_UVC_CAMERA,
|
.selector = UVC_CT_IRIS_RELATIVE_CONTROL,
|
.size = 8,
|
.offset = 0,
|
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
|
.data_type = UVC_CTRL_DATA_TYPE_SIGNED,
|
},
|
{
|
.id = V4L2_CID_ZOOM_ABSOLUTE,
|
.name = "Zoom, Absolute",
|
.entity = UVC_GUID_UVC_CAMERA,
|
.selector = UVC_CT_ZOOM_ABSOLUTE_CONTROL,
|
.size = 16,
|
.offset = 0,
|
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
|
.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
|
},
|
{
|
.id = V4L2_CID_ZOOM_CONTINUOUS,
|
.name = "Zoom, Continuous",
|
.entity = UVC_GUID_UVC_CAMERA,
|
.selector = UVC_CT_ZOOM_RELATIVE_CONTROL,
|
.size = 0,
|
.offset = 0,
|
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
|
.data_type = UVC_CTRL_DATA_TYPE_SIGNED,
|
.get = uvc_ctrl_get_zoom,
|
.set = uvc_ctrl_set_zoom,
|
},
|
{
|
.id = V4L2_CID_PAN_ABSOLUTE,
|
.name = "Pan (Absolute)",
|
.entity = UVC_GUID_UVC_CAMERA,
|
.selector = UVC_CT_PANTILT_ABSOLUTE_CONTROL,
|
.size = 32,
|
.offset = 0,
|
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
|
.data_type = UVC_CTRL_DATA_TYPE_SIGNED,
|
},
|
{
|
.id = V4L2_CID_TILT_ABSOLUTE,
|
.name = "Tilt (Absolute)",
|
.entity = UVC_GUID_UVC_CAMERA,
|
.selector = UVC_CT_PANTILT_ABSOLUTE_CONTROL,
|
.size = 32,
|
.offset = 32,
|
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
|
.data_type = UVC_CTRL_DATA_TYPE_SIGNED,
|
},
|
{
|
.id = V4L2_CID_PAN_SPEED,
|
.name = "Pan (Speed)",
|
.entity = UVC_GUID_UVC_CAMERA,
|
.selector = UVC_CT_PANTILT_RELATIVE_CONTROL,
|
.size = 16,
|
.offset = 0,
|
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
|
.data_type = UVC_CTRL_DATA_TYPE_SIGNED,
|
.get = uvc_ctrl_get_rel_speed,
|
.set = uvc_ctrl_set_rel_speed,
|
},
|
{
|
.id = V4L2_CID_TILT_SPEED,
|
.name = "Tilt (Speed)",
|
.entity = UVC_GUID_UVC_CAMERA,
|
.selector = UVC_CT_PANTILT_RELATIVE_CONTROL,
|
.size = 16,
|
.offset = 16,
|
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
|
.data_type = UVC_CTRL_DATA_TYPE_SIGNED,
|
.get = uvc_ctrl_get_rel_speed,
|
.set = uvc_ctrl_set_rel_speed,
|
},
|
{
|
.id = V4L2_CID_PRIVACY,
|
.name = "Privacy",
|
.entity = UVC_GUID_UVC_CAMERA,
|
.selector = UVC_CT_PRIVACY_CONTROL,
|
.size = 1,
|
.offset = 0,
|
.v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
|
.data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
|
},
|
};
|
|
/* ------------------------------------------------------------------------
|
* Utility functions
|
*/
|
|
static inline u8 *uvc_ctrl_data(struct uvc_control *ctrl, int id)
|
{
|
return ctrl->uvc_data + id * ctrl->info.size;
|
}
|
|
static inline int uvc_test_bit(const u8 *data, int bit)
|
{
|
return (data[bit >> 3] >> (bit & 7)) & 1;
|
}
|
|
static inline void uvc_clear_bit(u8 *data, int bit)
|
{
|
data[bit >> 3] &= ~(1 << (bit & 7));
|
}
|
|
/* Extract the bit string specified by mapping->offset and mapping->size
|
* from the little-endian data stored at 'data' and return the result as
|
* a signed 32bit integer. Sign extension will be performed if the mapping
|
* references a signed data type.
|
*/
|
static s32 uvc_get_le_value(struct uvc_control_mapping *mapping,
|
u8 query, const u8 *data)
|
{
|
int bits = mapping->size;
|
int offset = mapping->offset;
|
s32 value = 0;
|
u8 mask;
|
|
data += offset / 8;
|
offset &= 7;
|
mask = ((1LL << bits) - 1) << offset;
|
|
while (1) {
|
u8 byte = *data & mask;
|
value |= offset > 0 ? (byte >> offset) : (byte << (-offset));
|
bits -= 8 - (offset > 0 ? offset : 0);
|
if (bits <= 0)
|
break;
|
|
offset -= 8;
|
mask = (1 << bits) - 1;
|
data++;
|
}
|
|
/* Sign-extend the value if needed. */
|
if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED)
|
value |= -(value & (1 << (mapping->size - 1)));
|
|
return value;
|
}
|
|
/* Set the bit string specified by mapping->offset and mapping->size
|
* in the little-endian data stored at 'data' to the value 'value'.
|
*/
|
static void uvc_set_le_value(struct uvc_control_mapping *mapping,
|
s32 value, u8 *data)
|
{
|
int bits = mapping->size;
|
int offset = mapping->offset;
|
u8 mask;
|
|
/* According to the v4l2 spec, writing any value to a button control
|
* should result in the action belonging to the button control being
|
* triggered. UVC devices however want to see a 1 written -> override
|
* value.
|
*/
|
if (mapping->v4l2_type == V4L2_CTRL_TYPE_BUTTON)
|
value = -1;
|
|
data += offset / 8;
|
offset &= 7;
|
|
for (; bits > 0; data++) {
|
mask = ((1LL << bits) - 1) << offset;
|
*data = (*data & ~mask) | ((value << offset) & mask);
|
value >>= offset ? offset : 8;
|
bits -= 8 - offset;
|
offset = 0;
|
}
|
}
|
|
/* ------------------------------------------------------------------------
|
* Terminal and unit management
|
*/
|
|
static const u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING;
|
static const u8 uvc_camera_guid[16] = UVC_GUID_UVC_CAMERA;
|
static const u8 uvc_media_transport_input_guid[16] =
|
UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT;
|
|
static int uvc_entity_match_guid(const struct uvc_entity *entity,
|
const u8 guid[16])
|
{
|
switch (UVC_ENTITY_TYPE(entity)) {
|
case UVC_ITT_CAMERA:
|
return memcmp(uvc_camera_guid, guid, 16) == 0;
|
|
case UVC_ITT_MEDIA_TRANSPORT_INPUT:
|
return memcmp(uvc_media_transport_input_guid, guid, 16) == 0;
|
|
case UVC_VC_PROCESSING_UNIT:
|
return memcmp(uvc_processing_guid, guid, 16) == 0;
|
|
case UVC_VC_EXTENSION_UNIT:
|
return memcmp(entity->extension.guidExtensionCode,
|
guid, 16) == 0;
|
|
default:
|
return 0;
|
}
|
}
|
|
/* ------------------------------------------------------------------------
|
* UVC Controls
|
*/
|
|
static void __uvc_find_control(struct uvc_entity *entity, u32 v4l2_id,
|
struct uvc_control_mapping **mapping, struct uvc_control **control,
|
int next)
|
{
|
struct uvc_control *ctrl;
|
struct uvc_control_mapping *map;
|
unsigned int i;
|
|
if (entity == NULL)
|
return;
|
|
for (i = 0; i < entity->ncontrols; ++i) {
|
ctrl = &entity->controls[i];
|
if (!ctrl->initialized)
|
continue;
|
|
list_for_each_entry(map, &ctrl->info.mappings, list) {
|
if ((map->id == v4l2_id) && !next) {
|
*control = ctrl;
|
*mapping = map;
|
return;
|
}
|
|
if ((*mapping == NULL || (*mapping)->id > map->id) &&
|
(map->id > v4l2_id) && next) {
|
*control = ctrl;
|
*mapping = map;
|
}
|
}
|
}
|
}
|
|
static struct uvc_control *uvc_find_control(struct uvc_video_chain *chain,
|
u32 v4l2_id, struct uvc_control_mapping **mapping)
|
{
|
struct uvc_control *ctrl = NULL;
|
struct uvc_entity *entity;
|
int next = v4l2_id & V4L2_CTRL_FLAG_NEXT_CTRL;
|
|
*mapping = NULL;
|
|
/* Mask the query flags. */
|
v4l2_id &= V4L2_CTRL_ID_MASK;
|
|
/* Find the control. */
|
list_for_each_entry(entity, &chain->entities, chain) {
|
__uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
|
if (ctrl && !next)
|
return ctrl;
|
}
|
|
if (ctrl == NULL && !next)
|
uvc_trace(UVC_TRACE_CONTROL, "Control 0x%08x not found.\n",
|
v4l2_id);
|
|
return ctrl;
|
}
|
|
static int uvc_ctrl_populate_cache(struct uvc_video_chain *chain,
|
struct uvc_control *ctrl)
|
{
|
int ret;
|
|
if (ctrl->info.flags & UVC_CTRL_FLAG_GET_DEF) {
|
ret = uvc_query_ctrl(chain->dev, UVC_GET_DEF, ctrl->entity->id,
|
chain->dev->intfnum, ctrl->info.selector,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_DEF),
|
ctrl->info.size);
|
if (ret < 0)
|
return ret;
|
}
|
|
if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MIN) {
|
ret = uvc_query_ctrl(chain->dev, UVC_GET_MIN, ctrl->entity->id,
|
chain->dev->intfnum, ctrl->info.selector,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN),
|
ctrl->info.size);
|
if (ret < 0)
|
return ret;
|
}
|
if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MAX) {
|
ret = uvc_query_ctrl(chain->dev, UVC_GET_MAX, ctrl->entity->id,
|
chain->dev->intfnum, ctrl->info.selector,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX),
|
ctrl->info.size);
|
if (ret < 0)
|
return ret;
|
}
|
if (ctrl->info.flags & UVC_CTRL_FLAG_GET_RES) {
|
ret = uvc_query_ctrl(chain->dev, UVC_GET_RES, ctrl->entity->id,
|
chain->dev->intfnum, ctrl->info.selector,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES),
|
ctrl->info.size);
|
if (ret < 0) {
|
if (UVC_ENTITY_TYPE(ctrl->entity) !=
|
UVC_VC_EXTENSION_UNIT)
|
return ret;
|
|
/* GET_RES is mandatory for XU controls, but some
|
* cameras still choke on it. Ignore errors and set the
|
* resolution value to zero.
|
*/
|
uvc_warn_once(chain->dev, UVC_WARN_XU_GET_RES,
|
"UVC non compliance - GET_RES failed on "
|
"an XU control. Enabling workaround.\n");
|
memset(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES), 0,
|
ctrl->info.size);
|
}
|
}
|
|
ctrl->cached = 1;
|
return 0;
|
}
|
|
static s32 __uvc_ctrl_get_value(struct uvc_control_mapping *mapping,
|
const u8 *data)
|
{
|
s32 value = mapping->get(mapping, UVC_GET_CUR, data);
|
|
if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
|
const struct uvc_menu_info *menu = mapping->menu_info;
|
unsigned int i;
|
|
for (i = 0; i < mapping->menu_count; ++i, ++menu) {
|
if (menu->value == value) {
|
value = i;
|
break;
|
}
|
}
|
}
|
|
return value;
|
}
|
|
static int __uvc_ctrl_get(struct uvc_video_chain *chain,
|
struct uvc_control *ctrl, struct uvc_control_mapping *mapping,
|
s32 *value)
|
{
|
int ret;
|
|
if ((ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR) == 0)
|
return -EACCES;
|
|
if (!ctrl->loaded) {
|
ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, ctrl->entity->id,
|
chain->dev->intfnum, ctrl->info.selector,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
|
ctrl->info.size);
|
if (ret < 0)
|
return ret;
|
|
ctrl->loaded = 1;
|
}
|
|
*value = __uvc_ctrl_get_value(mapping,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
|
|
return 0;
|
}
|
|
static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
|
struct uvc_control *ctrl,
|
struct uvc_control_mapping *mapping,
|
struct v4l2_queryctrl *v4l2_ctrl)
|
{
|
struct uvc_control_mapping *master_map = NULL;
|
struct uvc_control *master_ctrl = NULL;
|
const struct uvc_menu_info *menu;
|
unsigned int i;
|
|
memset(v4l2_ctrl, 0, sizeof(*v4l2_ctrl));
|
v4l2_ctrl->id = mapping->id;
|
v4l2_ctrl->type = mapping->v4l2_type;
|
strscpy(v4l2_ctrl->name, mapping->name, sizeof(v4l2_ctrl->name));
|
v4l2_ctrl->flags = 0;
|
|
if (!(ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR))
|
v4l2_ctrl->flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
|
if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR))
|
v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
|
|
if (mapping->master_id)
|
__uvc_find_control(ctrl->entity, mapping->master_id,
|
&master_map, &master_ctrl, 0);
|
if (master_ctrl && (master_ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR)) {
|
s32 val;
|
int ret = __uvc_ctrl_get(chain, master_ctrl, master_map, &val);
|
if (ret < 0)
|
return ret;
|
|
if (val != mapping->master_manual)
|
v4l2_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
|
}
|
|
if (!ctrl->cached) {
|
int ret = uvc_ctrl_populate_cache(chain, ctrl);
|
if (ret < 0)
|
return ret;
|
}
|
|
if (ctrl->info.flags & UVC_CTRL_FLAG_GET_DEF) {
|
v4l2_ctrl->default_value = mapping->get(mapping, UVC_GET_DEF,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_DEF));
|
}
|
|
switch (mapping->v4l2_type) {
|
case V4L2_CTRL_TYPE_MENU:
|
v4l2_ctrl->minimum = 0;
|
v4l2_ctrl->maximum = mapping->menu_count - 1;
|
v4l2_ctrl->step = 1;
|
|
menu = mapping->menu_info;
|
for (i = 0; i < mapping->menu_count; ++i, ++menu) {
|
if (menu->value == v4l2_ctrl->default_value) {
|
v4l2_ctrl->default_value = i;
|
break;
|
}
|
}
|
|
return 0;
|
|
case V4L2_CTRL_TYPE_BOOLEAN:
|
v4l2_ctrl->minimum = 0;
|
v4l2_ctrl->maximum = 1;
|
v4l2_ctrl->step = 1;
|
return 0;
|
|
case V4L2_CTRL_TYPE_BUTTON:
|
v4l2_ctrl->minimum = 0;
|
v4l2_ctrl->maximum = 0;
|
v4l2_ctrl->step = 0;
|
return 0;
|
|
default:
|
break;
|
}
|
|
if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MIN)
|
v4l2_ctrl->minimum = mapping->get(mapping, UVC_GET_MIN,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN));
|
|
if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MAX)
|
v4l2_ctrl->maximum = mapping->get(mapping, UVC_GET_MAX,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX));
|
|
if (ctrl->info.flags & UVC_CTRL_FLAG_GET_RES)
|
v4l2_ctrl->step = mapping->get(mapping, UVC_GET_RES,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
|
|
return 0;
|
}
|
|
int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
|
struct v4l2_queryctrl *v4l2_ctrl)
|
{
|
struct uvc_control *ctrl;
|
struct uvc_control_mapping *mapping;
|
int ret;
|
|
ret = mutex_lock_interruptible(&chain->ctrl_mutex);
|
if (ret < 0)
|
return -ERESTARTSYS;
|
|
ctrl = uvc_find_control(chain, v4l2_ctrl->id, &mapping);
|
if (ctrl == NULL) {
|
ret = -EINVAL;
|
goto done;
|
}
|
|
ret = __uvc_query_v4l2_ctrl(chain, ctrl, mapping, v4l2_ctrl);
|
done:
|
mutex_unlock(&chain->ctrl_mutex);
|
return ret;
|
}
|
|
/*
|
* Mapping V4L2 controls to UVC controls can be straightforward if done well.
|
* Most of the UVC controls exist in V4L2, and can be mapped directly. Some
|
* must be grouped (for instance the Red Balance, Blue Balance and Do White
|
* Balance V4L2 controls use the White Balance Component UVC control) or
|
* otherwise translated. The approach we take here is to use a translation
|
* table for the controls that can be mapped directly, and handle the others
|
* manually.
|
*/
|
int uvc_query_v4l2_menu(struct uvc_video_chain *chain,
|
struct v4l2_querymenu *query_menu)
|
{
|
const struct uvc_menu_info *menu_info;
|
struct uvc_control_mapping *mapping;
|
struct uvc_control *ctrl;
|
u32 index = query_menu->index;
|
u32 id = query_menu->id;
|
int ret;
|
|
memset(query_menu, 0, sizeof(*query_menu));
|
query_menu->id = id;
|
query_menu->index = index;
|
|
ret = mutex_lock_interruptible(&chain->ctrl_mutex);
|
if (ret < 0)
|
return -ERESTARTSYS;
|
|
ctrl = uvc_find_control(chain, query_menu->id, &mapping);
|
if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU) {
|
ret = -EINVAL;
|
goto done;
|
}
|
|
if (query_menu->index >= mapping->menu_count) {
|
ret = -EINVAL;
|
goto done;
|
}
|
|
menu_info = &mapping->menu_info[query_menu->index];
|
|
if (mapping->data_type == UVC_CTRL_DATA_TYPE_BITMASK &&
|
(ctrl->info.flags & UVC_CTRL_FLAG_GET_RES)) {
|
s32 bitmap;
|
|
if (!ctrl->cached) {
|
ret = uvc_ctrl_populate_cache(chain, ctrl);
|
if (ret < 0)
|
goto done;
|
}
|
|
bitmap = mapping->get(mapping, UVC_GET_RES,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
|
if (!(bitmap & menu_info->value)) {
|
ret = -EINVAL;
|
goto done;
|
}
|
}
|
|
strscpy(query_menu->name, menu_info->name, sizeof(query_menu->name));
|
|
done:
|
mutex_unlock(&chain->ctrl_mutex);
|
return ret;
|
}
|
|
/* --------------------------------------------------------------------------
|
* Ctrl event handling
|
*/
|
|
static void uvc_ctrl_fill_event(struct uvc_video_chain *chain,
|
struct v4l2_event *ev,
|
struct uvc_control *ctrl,
|
struct uvc_control_mapping *mapping,
|
s32 value, u32 changes)
|
{
|
struct v4l2_queryctrl v4l2_ctrl;
|
|
__uvc_query_v4l2_ctrl(chain, ctrl, mapping, &v4l2_ctrl);
|
|
memset(ev, 0, sizeof(*ev));
|
ev->type = V4L2_EVENT_CTRL;
|
ev->id = v4l2_ctrl.id;
|
ev->u.ctrl.value = value;
|
ev->u.ctrl.changes = changes;
|
ev->u.ctrl.type = v4l2_ctrl.type;
|
ev->u.ctrl.flags = v4l2_ctrl.flags;
|
ev->u.ctrl.minimum = v4l2_ctrl.minimum;
|
ev->u.ctrl.maximum = v4l2_ctrl.maximum;
|
ev->u.ctrl.step = v4l2_ctrl.step;
|
ev->u.ctrl.default_value = v4l2_ctrl.default_value;
|
}
|
|
/*
|
* Send control change events to all subscribers for the @ctrl control. By
|
* default the subscriber that generated the event, as identified by @handle,
|
* is not notified unless it has set the V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK flag.
|
* @handle can be NULL for asynchronous events related to auto-update controls,
|
* in which case all subscribers are notified.
|
*/
|
static void uvc_ctrl_send_event(struct uvc_video_chain *chain,
|
struct uvc_fh *handle, struct uvc_control *ctrl,
|
struct uvc_control_mapping *mapping, s32 value, u32 changes)
|
{
|
struct v4l2_fh *originator = handle ? &handle->vfh : NULL;
|
struct v4l2_subscribed_event *sev;
|
struct v4l2_event ev;
|
|
if (list_empty(&mapping->ev_subs))
|
return;
|
|
uvc_ctrl_fill_event(chain, &ev, ctrl, mapping, value, changes);
|
|
list_for_each_entry(sev, &mapping->ev_subs, node) {
|
if (sev->fh != originator ||
|
(sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK) ||
|
(changes & V4L2_EVENT_CTRL_CH_FLAGS))
|
v4l2_event_queue_fh(sev->fh, &ev);
|
}
|
}
|
|
/*
|
* Send control change events for the slave of the @master control identified
|
* by the V4L2 ID @slave_id. The @handle identifies the event subscriber that
|
* generated the event and may be NULL for auto-update events.
|
*/
|
static void uvc_ctrl_send_slave_event(struct uvc_video_chain *chain,
|
struct uvc_fh *handle, struct uvc_control *master, u32 slave_id)
|
{
|
struct uvc_control_mapping *mapping = NULL;
|
struct uvc_control *ctrl = NULL;
|
u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
|
s32 val = 0;
|
|
__uvc_find_control(master->entity, slave_id, &mapping, &ctrl, 0);
|
if (ctrl == NULL)
|
return;
|
|
if (__uvc_ctrl_get(chain, ctrl, mapping, &val) == 0)
|
changes |= V4L2_EVENT_CTRL_CH_VALUE;
|
|
uvc_ctrl_send_event(chain, handle, ctrl, mapping, val, changes);
|
}
|
|
static void uvc_ctrl_status_event_work(struct work_struct *work)
|
{
|
struct uvc_device *dev = container_of(work, struct uvc_device,
|
async_ctrl.work);
|
struct uvc_ctrl_work *w = &dev->async_ctrl;
|
struct uvc_video_chain *chain = w->chain;
|
struct uvc_control_mapping *mapping;
|
struct uvc_control *ctrl = w->ctrl;
|
struct uvc_fh *handle;
|
unsigned int i;
|
int ret;
|
|
mutex_lock(&chain->ctrl_mutex);
|
|
handle = ctrl->handle;
|
ctrl->handle = NULL;
|
|
list_for_each_entry(mapping, &ctrl->info.mappings, list) {
|
s32 value = __uvc_ctrl_get_value(mapping, w->data);
|
|
/*
|
* handle may be NULL here if the device sends auto-update
|
* events without a prior related control set from userspace.
|
*/
|
for (i = 0; i < ARRAY_SIZE(mapping->slave_ids); ++i) {
|
if (!mapping->slave_ids[i])
|
break;
|
|
uvc_ctrl_send_slave_event(chain, handle, ctrl,
|
mapping->slave_ids[i]);
|
}
|
|
uvc_ctrl_send_event(chain, handle, ctrl, mapping, value,
|
V4L2_EVENT_CTRL_CH_VALUE);
|
}
|
|
mutex_unlock(&chain->ctrl_mutex);
|
|
/* Resubmit the URB. */
|
w->urb->interval = dev->int_ep->desc.bInterval;
|
ret = usb_submit_urb(w->urb, GFP_KERNEL);
|
if (ret < 0)
|
uvc_printk(KERN_ERR, "Failed to resubmit status URB (%d).\n",
|
ret);
|
}
|
|
bool uvc_ctrl_status_event(struct urb *urb, struct uvc_video_chain *chain,
|
struct uvc_control *ctrl, const u8 *data)
|
{
|
struct uvc_device *dev = chain->dev;
|
struct uvc_ctrl_work *w = &dev->async_ctrl;
|
|
if (list_empty(&ctrl->info.mappings)) {
|
ctrl->handle = NULL;
|
return false;
|
}
|
|
w->data = data;
|
w->urb = urb;
|
w->chain = chain;
|
w->ctrl = ctrl;
|
|
schedule_work(&w->work);
|
|
return true;
|
}
|
|
static bool uvc_ctrl_xctrls_has_control(const struct v4l2_ext_control *xctrls,
|
unsigned int xctrls_count, u32 id)
|
{
|
unsigned int i;
|
|
for (i = 0; i < xctrls_count; ++i) {
|
if (xctrls[i].id == id)
|
return true;
|
}
|
|
return false;
|
}
|
|
static void uvc_ctrl_send_events(struct uvc_fh *handle,
|
const struct v4l2_ext_control *xctrls, unsigned int xctrls_count)
|
{
|
struct uvc_control_mapping *mapping;
|
struct uvc_control *ctrl;
|
u32 changes = V4L2_EVENT_CTRL_CH_VALUE;
|
unsigned int i;
|
unsigned int j;
|
|
for (i = 0; i < xctrls_count; ++i) {
|
ctrl = uvc_find_control(handle->chain, xctrls[i].id, &mapping);
|
|
if (ctrl->info.flags & UVC_CTRL_FLAG_ASYNCHRONOUS)
|
/* Notification will be sent from an Interrupt event. */
|
continue;
|
|
for (j = 0; j < ARRAY_SIZE(mapping->slave_ids); ++j) {
|
u32 slave_id = mapping->slave_ids[j];
|
|
if (!slave_id)
|
break;
|
|
/*
|
* We can skip sending an event for the slave if the
|
* slave is being modified in the same transaction.
|
*/
|
if (uvc_ctrl_xctrls_has_control(xctrls, xctrls_count,
|
slave_id))
|
continue;
|
|
uvc_ctrl_send_slave_event(handle->chain, handle, ctrl,
|
slave_id);
|
}
|
|
/*
|
* If the master is being modified in the same transaction
|
* flags may change too.
|
*/
|
if (mapping->master_id &&
|
uvc_ctrl_xctrls_has_control(xctrls, xctrls_count,
|
mapping->master_id))
|
changes |= V4L2_EVENT_CTRL_CH_FLAGS;
|
|
uvc_ctrl_send_event(handle->chain, handle, ctrl, mapping,
|
xctrls[i].value, changes);
|
}
|
}
|
|
static int uvc_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
|
{
|
struct uvc_fh *handle = container_of(sev->fh, struct uvc_fh, vfh);
|
struct uvc_control_mapping *mapping;
|
struct uvc_control *ctrl;
|
int ret;
|
|
ret = mutex_lock_interruptible(&handle->chain->ctrl_mutex);
|
if (ret < 0)
|
return -ERESTARTSYS;
|
|
ctrl = uvc_find_control(handle->chain, sev->id, &mapping);
|
if (ctrl == NULL) {
|
ret = -EINVAL;
|
goto done;
|
}
|
|
list_add_tail(&sev->node, &mapping->ev_subs);
|
if (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL) {
|
struct v4l2_event ev;
|
u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
|
s32 val = 0;
|
|
if (__uvc_ctrl_get(handle->chain, ctrl, mapping, &val) == 0)
|
changes |= V4L2_EVENT_CTRL_CH_VALUE;
|
|
uvc_ctrl_fill_event(handle->chain, &ev, ctrl, mapping, val,
|
changes);
|
/* Mark the queue as active, allowing this initial
|
event to be accepted. */
|
sev->elems = elems;
|
v4l2_event_queue_fh(sev->fh, &ev);
|
}
|
|
done:
|
mutex_unlock(&handle->chain->ctrl_mutex);
|
return ret;
|
}
|
|
static void uvc_ctrl_del_event(struct v4l2_subscribed_event *sev)
|
{
|
struct uvc_fh *handle = container_of(sev->fh, struct uvc_fh, vfh);
|
|
mutex_lock(&handle->chain->ctrl_mutex);
|
list_del(&sev->node);
|
mutex_unlock(&handle->chain->ctrl_mutex);
|
}
|
|
const struct v4l2_subscribed_event_ops uvc_ctrl_sub_ev_ops = {
|
.add = uvc_ctrl_add_event,
|
.del = uvc_ctrl_del_event,
|
.replace = v4l2_ctrl_replace,
|
.merge = v4l2_ctrl_merge,
|
};
|
|
/* --------------------------------------------------------------------------
|
* Control transactions
|
*
|
* To make extended set operations as atomic as the hardware allows, controls
|
* are handled using begin/commit/rollback operations.
|
*
|
* At the beginning of a set request, uvc_ctrl_begin should be called to
|
* initialize the request. This function acquires the control lock.
|
*
|
* When setting a control, the new value is stored in the control data field
|
* at position UVC_CTRL_DATA_CURRENT. The control is then marked as dirty for
|
* later processing. If the UVC and V4L2 control sizes differ, the current
|
* value is loaded from the hardware before storing the new value in the data
|
* field.
|
*
|
* After processing all controls in the transaction, uvc_ctrl_commit or
|
* uvc_ctrl_rollback must be called to apply the pending changes to the
|
* hardware or revert them. When applying changes, all controls marked as
|
* dirty will be modified in the UVC device, and the dirty flag will be
|
* cleared. When reverting controls, the control data field
|
* UVC_CTRL_DATA_CURRENT is reverted to its previous value
|
* (UVC_CTRL_DATA_BACKUP) for all dirty controls. Both functions release the
|
* control lock.
|
*/
|
int uvc_ctrl_begin(struct uvc_video_chain *chain)
|
{
|
return mutex_lock_interruptible(&chain->ctrl_mutex) ? -ERESTARTSYS : 0;
|
}
|
|
static int uvc_ctrl_commit_entity(struct uvc_device *dev,
|
struct uvc_entity *entity, int rollback)
|
{
|
struct uvc_control *ctrl;
|
unsigned int i;
|
int ret;
|
|
if (entity == NULL)
|
return 0;
|
|
for (i = 0; i < entity->ncontrols; ++i) {
|
ctrl = &entity->controls[i];
|
if (!ctrl->initialized)
|
continue;
|
|
/* Reset the loaded flag for auto-update controls that were
|
* marked as loaded in uvc_ctrl_get/uvc_ctrl_set to prevent
|
* uvc_ctrl_get from using the cached value, and for write-only
|
* controls to prevent uvc_ctrl_set from setting bits not
|
* explicitly set by the user.
|
*/
|
if (ctrl->info.flags & UVC_CTRL_FLAG_AUTO_UPDATE ||
|
!(ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR))
|
ctrl->loaded = 0;
|
|
if (!ctrl->dirty)
|
continue;
|
|
if (!rollback)
|
ret = uvc_query_ctrl(dev, UVC_SET_CUR, ctrl->entity->id,
|
dev->intfnum, ctrl->info.selector,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
|
ctrl->info.size);
|
else
|
ret = 0;
|
|
if (rollback || ret < 0)
|
memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
|
ctrl->info.size);
|
|
ctrl->dirty = 0;
|
|
if (ret < 0)
|
return ret;
|
}
|
|
return 0;
|
}
|
|
int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback,
|
const struct v4l2_ext_control *xctrls,
|
unsigned int xctrls_count)
|
{
|
struct uvc_video_chain *chain = handle->chain;
|
struct uvc_entity *entity;
|
int ret = 0;
|
|
/* Find the control. */
|
list_for_each_entry(entity, &chain->entities, chain) {
|
ret = uvc_ctrl_commit_entity(chain->dev, entity, rollback);
|
if (ret < 0)
|
goto done;
|
}
|
|
if (!rollback)
|
uvc_ctrl_send_events(handle, xctrls, xctrls_count);
|
done:
|
mutex_unlock(&chain->ctrl_mutex);
|
return ret;
|
}
|
|
int uvc_ctrl_get(struct uvc_video_chain *chain,
|
struct v4l2_ext_control *xctrl)
|
{
|
struct uvc_control *ctrl;
|
struct uvc_control_mapping *mapping;
|
|
ctrl = uvc_find_control(chain, xctrl->id, &mapping);
|
if (ctrl == NULL)
|
return -EINVAL;
|
|
return __uvc_ctrl_get(chain, ctrl, mapping, &xctrl->value);
|
}
|
|
int uvc_ctrl_set(struct uvc_fh *handle,
|
struct v4l2_ext_control *xctrl)
|
{
|
struct uvc_video_chain *chain = handle->chain;
|
struct uvc_control *ctrl;
|
struct uvc_control_mapping *mapping;
|
s32 value;
|
u32 step;
|
s32 min;
|
s32 max;
|
int ret;
|
|
ctrl = uvc_find_control(chain, xctrl->id, &mapping);
|
if (ctrl == NULL)
|
return -EINVAL;
|
if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR))
|
return -EACCES;
|
|
/* Clamp out of range values. */
|
switch (mapping->v4l2_type) {
|
case V4L2_CTRL_TYPE_INTEGER:
|
if (!ctrl->cached) {
|
ret = uvc_ctrl_populate_cache(chain, ctrl);
|
if (ret < 0)
|
return ret;
|
}
|
|
min = mapping->get(mapping, UVC_GET_MIN,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN));
|
max = mapping->get(mapping, UVC_GET_MAX,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX));
|
step = mapping->get(mapping, UVC_GET_RES,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
|
if (step == 0)
|
step = 1;
|
|
xctrl->value = min + ((u32)(xctrl->value - min) + step / 2)
|
/ step * step;
|
if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED)
|
xctrl->value = clamp(xctrl->value, min, max);
|
else
|
xctrl->value = clamp_t(u32, xctrl->value, min, max);
|
value = xctrl->value;
|
break;
|
|
case V4L2_CTRL_TYPE_BOOLEAN:
|
xctrl->value = clamp(xctrl->value, 0, 1);
|
value = xctrl->value;
|
break;
|
|
case V4L2_CTRL_TYPE_MENU:
|
if (xctrl->value < 0 || xctrl->value >= mapping->menu_count)
|
return -ERANGE;
|
value = mapping->menu_info[xctrl->value].value;
|
|
/* Valid menu indices are reported by the GET_RES request for
|
* UVC controls that support it.
|
*/
|
if (mapping->data_type == UVC_CTRL_DATA_TYPE_BITMASK &&
|
(ctrl->info.flags & UVC_CTRL_FLAG_GET_RES)) {
|
if (!ctrl->cached) {
|
ret = uvc_ctrl_populate_cache(chain, ctrl);
|
if (ret < 0)
|
return ret;
|
}
|
|
step = mapping->get(mapping, UVC_GET_RES,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
|
if (!(step & value))
|
return -EINVAL;
|
}
|
|
break;
|
|
default:
|
value = xctrl->value;
|
break;
|
}
|
|
/* If the mapping doesn't span the whole UVC control, the current value
|
* needs to be loaded from the device to perform the read-modify-write
|
* operation.
|
*/
|
if (!ctrl->loaded && (ctrl->info.size * 8) != mapping->size) {
|
if ((ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR) == 0) {
|
memset(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
|
0, ctrl->info.size);
|
} else {
|
ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
|
ctrl->entity->id, chain->dev->intfnum,
|
ctrl->info.selector,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
|
ctrl->info.size);
|
if (ret < 0)
|
return ret;
|
}
|
|
ctrl->loaded = 1;
|
}
|
|
/* Backup the current value in case we need to rollback later. */
|
if (!ctrl->dirty) {
|
memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
|
ctrl->info.size);
|
}
|
|
mapping->set(mapping, value,
|
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
|
|
if (ctrl->info.flags & UVC_CTRL_FLAG_ASYNCHRONOUS)
|
ctrl->handle = handle;
|
|
ctrl->dirty = 1;
|
ctrl->modified = 1;
|
return 0;
|
}
|
|
/* --------------------------------------------------------------------------
|
* Dynamic controls
|
*/
|
|
/*
|
* Retrieve flags for a given control
|
*/
|
static int uvc_ctrl_get_flags(struct uvc_device *dev,
|
const struct uvc_control *ctrl,
|
struct uvc_control_info *info)
|
{
|
u8 *data;
|
int ret;
|
|
data = kmalloc(1, GFP_KERNEL);
|
if (data == NULL)
|
return -ENOMEM;
|
|
ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum,
|
info->selector, data, 1);
|
if (!ret)
|
info->flags |= (data[0] & UVC_CONTROL_CAP_GET ?
|
UVC_CTRL_FLAG_GET_CUR : 0)
|
| (data[0] & UVC_CONTROL_CAP_SET ?
|
UVC_CTRL_FLAG_SET_CUR : 0)
|
| (data[0] & UVC_CONTROL_CAP_AUTOUPDATE ?
|
UVC_CTRL_FLAG_AUTO_UPDATE : 0)
|
| (data[0] & UVC_CONTROL_CAP_ASYNCHRONOUS ?
|
UVC_CTRL_FLAG_ASYNCHRONOUS : 0);
|
|
kfree(data);
|
return ret;
|
}
|
|
static void uvc_ctrl_fixup_xu_info(struct uvc_device *dev,
|
const struct uvc_control *ctrl, struct uvc_control_info *info)
|
{
|
struct uvc_ctrl_fixup {
|
struct usb_device_id id;
|
u8 entity;
|
u8 selector;
|
u8 flags;
|
};
|
|
static const struct uvc_ctrl_fixup fixups[] = {
|
{ { USB_DEVICE(0x046d, 0x08c2) }, 9, 1,
|
UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX |
|
UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_SET_CUR |
|
UVC_CTRL_FLAG_AUTO_UPDATE },
|
{ { USB_DEVICE(0x046d, 0x08cc) }, 9, 1,
|
UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX |
|
UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_SET_CUR |
|
UVC_CTRL_FLAG_AUTO_UPDATE },
|
{ { USB_DEVICE(0x046d, 0x0994) }, 9, 1,
|
UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX |
|
UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_SET_CUR |
|
UVC_CTRL_FLAG_AUTO_UPDATE },
|
};
|
|
unsigned int i;
|
|
for (i = 0; i < ARRAY_SIZE(fixups); ++i) {
|
if (!usb_match_one_id(dev->intf, &fixups[i].id))
|
continue;
|
|
if (fixups[i].entity == ctrl->entity->id &&
|
fixups[i].selector == info->selector) {
|
info->flags = fixups[i].flags;
|
return;
|
}
|
}
|
}
|
|
/*
|
* Query control information (size and flags) for XU controls.
|
*/
|
static int uvc_ctrl_fill_xu_info(struct uvc_device *dev,
|
const struct uvc_control *ctrl, struct uvc_control_info *info)
|
{
|
u8 *data;
|
int ret;
|
|
data = kmalloc(2, GFP_KERNEL);
|
if (data == NULL)
|
return -ENOMEM;
|
|
memcpy(info->entity, ctrl->entity->extension.guidExtensionCode,
|
sizeof(info->entity));
|
info->index = ctrl->index;
|
info->selector = ctrl->index + 1;
|
|
/* Query and verify the control length (GET_LEN) */
|
ret = uvc_query_ctrl(dev, UVC_GET_LEN, ctrl->entity->id, dev->intfnum,
|
info->selector, data, 2);
|
if (ret < 0) {
|
uvc_trace(UVC_TRACE_CONTROL,
|
"GET_LEN failed on control %pUl/%u (%d).\n",
|
info->entity, info->selector, ret);
|
goto done;
|
}
|
|
info->size = le16_to_cpup((__le16 *)data);
|
|
info->flags = UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX
|
| UVC_CTRL_FLAG_GET_RES | UVC_CTRL_FLAG_GET_DEF;
|
|
ret = uvc_ctrl_get_flags(dev, ctrl, info);
|
if (ret < 0) {
|
uvc_trace(UVC_TRACE_CONTROL,
|
"Failed to get flags for control %pUl/%u (%d).\n",
|
info->entity, info->selector, ret);
|
goto done;
|
}
|
|
uvc_ctrl_fixup_xu_info(dev, ctrl, info);
|
|
uvc_trace(UVC_TRACE_CONTROL, "XU control %pUl/%u queried: len %u, "
|
"flags { get %u set %u auto %u }.\n",
|
info->entity, info->selector, info->size,
|
(info->flags & UVC_CTRL_FLAG_GET_CUR) ? 1 : 0,
|
(info->flags & UVC_CTRL_FLAG_SET_CUR) ? 1 : 0,
|
(info->flags & UVC_CTRL_FLAG_AUTO_UPDATE) ? 1 : 0);
|
|
done:
|
kfree(data);
|
return ret;
|
}
|
|
static int uvc_ctrl_add_info(struct uvc_device *dev, struct uvc_control *ctrl,
|
const struct uvc_control_info *info);
|
|
static int uvc_ctrl_init_xu_ctrl(struct uvc_device *dev,
|
struct uvc_control *ctrl)
|
{
|
struct uvc_control_info info;
|
int ret;
|
|
if (ctrl->initialized)
|
return 0;
|
|
ret = uvc_ctrl_fill_xu_info(dev, ctrl, &info);
|
if (ret < 0)
|
return ret;
|
|
ret = uvc_ctrl_add_info(dev, ctrl, &info);
|
if (ret < 0)
|
uvc_trace(UVC_TRACE_CONTROL, "Failed to initialize control "
|
"%pUl/%u on device %s entity %u\n", info.entity,
|
info.selector, dev->udev->devpath, ctrl->entity->id);
|
|
return ret;
|
}
|
|
int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
|
struct uvc_xu_control_query *xqry)
|
{
|
struct uvc_entity *entity;
|
struct uvc_control *ctrl;
|
unsigned int i;
|
bool found;
|
u32 reqflags;
|
u16 size;
|
u8 *data = NULL;
|
int ret;
|
|
/* Find the extension unit. */
|
found = false;
|
list_for_each_entry(entity, &chain->entities, chain) {
|
if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT &&
|
entity->id == xqry->unit) {
|
found = true;
|
break;
|
}
|
}
|
|
if (!found) {
|
uvc_trace(UVC_TRACE_CONTROL, "Extension unit %u not found.\n",
|
xqry->unit);
|
return -ENOENT;
|
}
|
|
/* Find the control and perform delayed initialization if needed. */
|
found = false;
|
for (i = 0; i < entity->ncontrols; ++i) {
|
ctrl = &entity->controls[i];
|
if (ctrl->index == xqry->selector - 1) {
|
found = true;
|
break;
|
}
|
}
|
|
if (!found) {
|
uvc_trace(UVC_TRACE_CONTROL, "Control %pUl/%u not found.\n",
|
entity->extension.guidExtensionCode, xqry->selector);
|
return -ENOENT;
|
}
|
|
if (mutex_lock_interruptible(&chain->ctrl_mutex))
|
return -ERESTARTSYS;
|
|
ret = uvc_ctrl_init_xu_ctrl(chain->dev, ctrl);
|
if (ret < 0) {
|
ret = -ENOENT;
|
goto done;
|
}
|
|
/* Validate the required buffer size and flags for the request */
|
reqflags = 0;
|
size = ctrl->info.size;
|
|
switch (xqry->query) {
|
case UVC_GET_CUR:
|
reqflags = UVC_CTRL_FLAG_GET_CUR;
|
break;
|
case UVC_GET_MIN:
|
reqflags = UVC_CTRL_FLAG_GET_MIN;
|
break;
|
case UVC_GET_MAX:
|
reqflags = UVC_CTRL_FLAG_GET_MAX;
|
break;
|
case UVC_GET_DEF:
|
reqflags = UVC_CTRL_FLAG_GET_DEF;
|
break;
|
case UVC_GET_RES:
|
reqflags = UVC_CTRL_FLAG_GET_RES;
|
break;
|
case UVC_SET_CUR:
|
reqflags = UVC_CTRL_FLAG_SET_CUR;
|
break;
|
case UVC_GET_LEN:
|
size = 2;
|
break;
|
case UVC_GET_INFO:
|
size = 1;
|
break;
|
default:
|
ret = -EINVAL;
|
goto done;
|
}
|
|
if (size != xqry->size) {
|
ret = -ENOBUFS;
|
goto done;
|
}
|
|
if (reqflags && !(ctrl->info.flags & reqflags)) {
|
ret = -EBADRQC;
|
goto done;
|
}
|
|
data = kmalloc(size, GFP_KERNEL);
|
if (data == NULL) {
|
ret = -ENOMEM;
|
goto done;
|
}
|
|
if (xqry->query == UVC_SET_CUR &&
|
copy_from_user(data, xqry->data, size)) {
|
ret = -EFAULT;
|
goto done;
|
}
|
|
ret = uvc_query_ctrl(chain->dev, xqry->query, xqry->unit,
|
chain->dev->intfnum, xqry->selector, data, size);
|
if (ret < 0)
|
goto done;
|
|
if (xqry->query != UVC_SET_CUR &&
|
copy_to_user(xqry->data, data, size))
|
ret = -EFAULT;
|
done:
|
kfree(data);
|
mutex_unlock(&chain->ctrl_mutex);
|
return ret;
|
}
|
|
/* --------------------------------------------------------------------------
|
* Suspend/resume
|
*/
|
|
/*
|
* Restore control values after resume, skipping controls that haven't been
|
* changed.
|
*
|
* TODO
|
* - Don't restore modified controls that are back to their default value.
|
* - Handle restore order (Auto-Exposure Mode should be restored before
|
* Exposure Time).
|
*/
|
int uvc_ctrl_restore_values(struct uvc_device *dev)
|
{
|
struct uvc_control *ctrl;
|
struct uvc_entity *entity;
|
unsigned int i;
|
int ret;
|
|
/* Walk the entities list and restore controls when possible. */
|
list_for_each_entry(entity, &dev->entities, list) {
|
|
for (i = 0; i < entity->ncontrols; ++i) {
|
ctrl = &entity->controls[i];
|
|
if (!ctrl->initialized || !ctrl->modified ||
|
(ctrl->info.flags & UVC_CTRL_FLAG_RESTORE) == 0)
|
continue;
|
|
printk(KERN_INFO "restoring control %pUl/%u/%u\n",
|
ctrl->info.entity, ctrl->info.index,
|
ctrl->info.selector);
|
ctrl->dirty = 1;
|
}
|
|
ret = uvc_ctrl_commit_entity(dev, entity, 0);
|
if (ret < 0)
|
return ret;
|
}
|
|
return 0;
|
}
|
|
/* --------------------------------------------------------------------------
|
* Control and mapping handling
|
*/
|
|
/*
|
* Add control information to a given control.
|
*/
|
static int uvc_ctrl_add_info(struct uvc_device *dev, struct uvc_control *ctrl,
|
const struct uvc_control_info *info)
|
{
|
ctrl->info = *info;
|
INIT_LIST_HEAD(&ctrl->info.mappings);
|
|
/* Allocate an array to save control values (cur, def, max, etc.) */
|
ctrl->uvc_data = kzalloc(ctrl->info.size * UVC_CTRL_DATA_LAST + 1,
|
GFP_KERNEL);
|
if (!ctrl->uvc_data)
|
return -ENOMEM;
|
|
ctrl->initialized = 1;
|
|
uvc_trace(UVC_TRACE_CONTROL, "Added control %pUl/%u to device %s "
|
"entity %u\n", ctrl->info.entity, ctrl->info.selector,
|
dev->udev->devpath, ctrl->entity->id);
|
|
return 0;
|
}
|
|
/*
|
* Add a control mapping to a given control.
|
*/
|
static int __uvc_ctrl_add_mapping(struct uvc_device *dev,
|
struct uvc_control *ctrl, const struct uvc_control_mapping *mapping)
|
{
|
struct uvc_control_mapping *map;
|
unsigned int size;
|
|
/* Most mappings come from static kernel data and need to be duplicated.
|
* Mappings that come from userspace will be unnecessarily duplicated,
|
* this could be optimized.
|
*/
|
map = kmemdup(mapping, sizeof(*mapping), GFP_KERNEL);
|
if (map == NULL)
|
return -ENOMEM;
|
|
INIT_LIST_HEAD(&map->ev_subs);
|
|
size = sizeof(*mapping->menu_info) * mapping->menu_count;
|
map->menu_info = kmemdup(mapping->menu_info, size, GFP_KERNEL);
|
if (map->menu_info == NULL) {
|
kfree(map);
|
return -ENOMEM;
|
}
|
|
if (map->get == NULL)
|
map->get = uvc_get_le_value;
|
if (map->set == NULL)
|
map->set = uvc_set_le_value;
|
|
list_add_tail(&map->list, &ctrl->info.mappings);
|
uvc_trace(UVC_TRACE_CONTROL,
|
"Adding mapping '%s' to control %pUl/%u.\n",
|
map->name, ctrl->info.entity, ctrl->info.selector);
|
|
return 0;
|
}
|
|
int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
|
const struct uvc_control_mapping *mapping)
|
{
|
struct uvc_device *dev = chain->dev;
|
struct uvc_control_mapping *map;
|
struct uvc_entity *entity;
|
struct uvc_control *ctrl;
|
int found = 0;
|
int ret;
|
|
if (mapping->id & ~V4L2_CTRL_ID_MASK) {
|
uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s', control "
|
"id 0x%08x is invalid.\n", mapping->name,
|
mapping->id);
|
return -EINVAL;
|
}
|
|
/* Search for the matching (GUID/CS) control on the current chain */
|
list_for_each_entry(entity, &chain->entities, chain) {
|
unsigned int i;
|
|
if (UVC_ENTITY_TYPE(entity) != UVC_VC_EXTENSION_UNIT ||
|
!uvc_entity_match_guid(entity, mapping->entity))
|
continue;
|
|
for (i = 0; i < entity->ncontrols; ++i) {
|
ctrl = &entity->controls[i];
|
if (ctrl->index == mapping->selector - 1) {
|
found = 1;
|
break;
|
}
|
}
|
|
if (found)
|
break;
|
}
|
if (!found)
|
return -ENOENT;
|
|
if (mutex_lock_interruptible(&chain->ctrl_mutex))
|
return -ERESTARTSYS;
|
|
/* Perform delayed initialization of XU controls */
|
ret = uvc_ctrl_init_xu_ctrl(dev, ctrl);
|
if (ret < 0) {
|
ret = -ENOENT;
|
goto done;
|
}
|
|
/* Validate the user-provided bit-size and offset */
|
if (mapping->size > 32 ||
|
mapping->offset + mapping->size > ctrl->info.size * 8) {
|
ret = -EINVAL;
|
goto done;
|
}
|
|
list_for_each_entry(map, &ctrl->info.mappings, list) {
|
if (mapping->id == map->id) {
|
uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s', "
|
"control id 0x%08x already exists.\n",
|
mapping->name, mapping->id);
|
ret = -EEXIST;
|
goto done;
|
}
|
}
|
|
/* Prevent excess memory consumption */
|
if (atomic_inc_return(&dev->nmappings) > UVC_MAX_CONTROL_MAPPINGS) {
|
atomic_dec(&dev->nmappings);
|
uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s', maximum "
|
"mappings count (%u) exceeded.\n", mapping->name,
|
UVC_MAX_CONTROL_MAPPINGS);
|
ret = -ENOMEM;
|
goto done;
|
}
|
|
ret = __uvc_ctrl_add_mapping(dev, ctrl, mapping);
|
if (ret < 0)
|
atomic_dec(&dev->nmappings);
|
|
done:
|
mutex_unlock(&chain->ctrl_mutex);
|
return ret;
|
}
|
|
/*
|
* Prune an entity of its bogus controls using a blacklist. Bogus controls
|
* are currently the ones that crash the camera or unconditionally return an
|
* error when queried.
|
*/
|
static void uvc_ctrl_prune_entity(struct uvc_device *dev,
|
struct uvc_entity *entity)
|
{
|
struct uvc_ctrl_blacklist {
|
struct usb_device_id id;
|
u8 index;
|
};
|
|
static const struct uvc_ctrl_blacklist processing_blacklist[] = {
|
{ { USB_DEVICE(0x13d3, 0x509b) }, 9 }, /* Gain */
|
{ { USB_DEVICE(0x1c4f, 0x3000) }, 6 }, /* WB Temperature */
|
{ { USB_DEVICE(0x5986, 0x0241) }, 2 }, /* Hue */
|
};
|
static const struct uvc_ctrl_blacklist camera_blacklist[] = {
|
{ { USB_DEVICE(0x06f8, 0x3005) }, 9 }, /* Zoom, Absolute */
|
};
|
|
const struct uvc_ctrl_blacklist *blacklist;
|
unsigned int size;
|
unsigned int count;
|
unsigned int i;
|
u8 *controls;
|
|
switch (UVC_ENTITY_TYPE(entity)) {
|
case UVC_VC_PROCESSING_UNIT:
|
blacklist = processing_blacklist;
|
count = ARRAY_SIZE(processing_blacklist);
|
controls = entity->processing.bmControls;
|
size = entity->processing.bControlSize;
|
break;
|
|
case UVC_ITT_CAMERA:
|
blacklist = camera_blacklist;
|
count = ARRAY_SIZE(camera_blacklist);
|
controls = entity->camera.bmControls;
|
size = entity->camera.bControlSize;
|
break;
|
|
default:
|
return;
|
}
|
|
for (i = 0; i < count; ++i) {
|
if (!usb_match_one_id(dev->intf, &blacklist[i].id))
|
continue;
|
|
if (blacklist[i].index >= 8 * size ||
|
!uvc_test_bit(controls, blacklist[i].index))
|
continue;
|
|
uvc_trace(UVC_TRACE_CONTROL, "%u/%u control is black listed, "
|
"removing it.\n", entity->id, blacklist[i].index);
|
|
uvc_clear_bit(controls, blacklist[i].index);
|
}
|
}
|
|
/*
|
* Add control information and hardcoded stock control mappings to the given
|
* device.
|
*/
|
static void uvc_ctrl_init_ctrl(struct uvc_device *dev, struct uvc_control *ctrl)
|
{
|
const struct uvc_control_info *info = uvc_ctrls;
|
const struct uvc_control_info *iend = info + ARRAY_SIZE(uvc_ctrls);
|
const struct uvc_control_mapping *mapping = uvc_ctrl_mappings;
|
const struct uvc_control_mapping *mend =
|
mapping + ARRAY_SIZE(uvc_ctrl_mappings);
|
|
/* XU controls initialization requires querying the device for control
|
* information. As some buggy UVC devices will crash when queried
|
* repeatedly in a tight loop, delay XU controls initialization until
|
* first use.
|
*/
|
if (UVC_ENTITY_TYPE(ctrl->entity) == UVC_VC_EXTENSION_UNIT)
|
return;
|
|
for (; info < iend; ++info) {
|
if (uvc_entity_match_guid(ctrl->entity, info->entity) &&
|
ctrl->index == info->index) {
|
uvc_ctrl_add_info(dev, ctrl, info);
|
/*
|
* Retrieve control flags from the device. Ignore errors
|
* and work with default flag values from the uvc_ctrl
|
* array when the device doesn't properly implement
|
* GET_INFO on standard controls.
|
*/
|
uvc_ctrl_get_flags(dev, ctrl, &ctrl->info);
|
break;
|
}
|
}
|
|
if (!ctrl->initialized)
|
return;
|
|
for (; mapping < mend; ++mapping) {
|
if (uvc_entity_match_guid(ctrl->entity, mapping->entity) &&
|
ctrl->info.selector == mapping->selector)
|
__uvc_ctrl_add_mapping(dev, ctrl, mapping);
|
}
|
}
|
|
/*
|
* Initialize device controls.
|
*/
|
int uvc_ctrl_init_device(struct uvc_device *dev)
|
{
|
struct uvc_entity *entity;
|
unsigned int i;
|
|
INIT_WORK(&dev->async_ctrl.work, uvc_ctrl_status_event_work);
|
|
/* Walk the entities list and instantiate controls */
|
list_for_each_entry(entity, &dev->entities, list) {
|
struct uvc_control *ctrl;
|
unsigned int bControlSize = 0, ncontrols;
|
u8 *bmControls = NULL;
|
|
if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT) {
|
bmControls = entity->extension.bmControls;
|
bControlSize = entity->extension.bControlSize;
|
} else if (UVC_ENTITY_TYPE(entity) == UVC_VC_PROCESSING_UNIT) {
|
bmControls = entity->processing.bmControls;
|
bControlSize = entity->processing.bControlSize;
|
} else if (UVC_ENTITY_TYPE(entity) == UVC_ITT_CAMERA) {
|
bmControls = entity->camera.bmControls;
|
bControlSize = entity->camera.bControlSize;
|
}
|
|
/* Remove bogus/blacklisted controls */
|
uvc_ctrl_prune_entity(dev, entity);
|
|
/* Count supported controls and allocate the controls array */
|
ncontrols = memweight(bmControls, bControlSize);
|
if (ncontrols == 0)
|
continue;
|
|
entity->controls = kcalloc(ncontrols, sizeof(*ctrl),
|
GFP_KERNEL);
|
if (entity->controls == NULL)
|
return -ENOMEM;
|
entity->ncontrols = ncontrols;
|
|
/* Initialize all supported controls */
|
ctrl = entity->controls;
|
for (i = 0; i < bControlSize * 8; ++i) {
|
if (uvc_test_bit(bmControls, i) == 0)
|
continue;
|
|
ctrl->entity = entity;
|
ctrl->index = i;
|
|
uvc_ctrl_init_ctrl(dev, ctrl);
|
ctrl++;
|
}
|
}
|
|
return 0;
|
}
|
|
/*
|
* Cleanup device controls.
|
*/
|
static void uvc_ctrl_cleanup_mappings(struct uvc_device *dev,
|
struct uvc_control *ctrl)
|
{
|
struct uvc_control_mapping *mapping, *nm;
|
|
list_for_each_entry_safe(mapping, nm, &ctrl->info.mappings, list) {
|
list_del(&mapping->list);
|
kfree(mapping->menu_info);
|
kfree(mapping);
|
}
|
}
|
|
void uvc_ctrl_cleanup_device(struct uvc_device *dev)
|
{
|
struct uvc_entity *entity;
|
unsigned int i;
|
|
/* Can be uninitialized if we are aborting on probe error. */
|
if (dev->async_ctrl.work.func)
|
cancel_work_sync(&dev->async_ctrl.work);
|
|
/* Free controls and control mappings for all entities. */
|
list_for_each_entry(entity, &dev->entities, list) {
|
for (i = 0; i < entity->ncontrols; ++i) {
|
struct uvc_control *ctrl = &entity->controls[i];
|
|
if (!ctrl->initialized)
|
continue;
|
|
uvc_ctrl_cleanup_mappings(dev, ctrl);
|
kfree(ctrl->uvc_data);
|
}
|
|
kfree(entity->controls);
|
}
|
}
|
