diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/media/usb/uvc/uvc_ctrl.c | 2697 |
1 files changed, 2697 insertions, 0 deletions
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c new file mode 100644 index 000000000..6d7535efc --- /dev/null +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -0,0 +1,2697 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * uvc_ctrl.c -- USB Video Class driver - Controls + * + * Copyright (C) 2005-2010 + * Laurent Pinchart (laurent.pinchart@ideasonboard.com) + */ + +#include <asm/barrier.h> +#include <linux/bitops.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/uaccess.h> +#include <linux/usb.h> +#include <linux/videodev2.h> +#include <linux/vmalloc.h> +#include <linux/wait.h> +#include <linux/workqueue.h> +#include <linux/atomic.h> +#include <media/v4l2-ctrls.h> +#include <media/v4l2-uvc.h> + +#include "uvcvideo.h" + +#define UVC_CTRL_DATA_CURRENT 0 +#define UVC_CTRL_DATA_BACKUP 1 +#define UVC_CTRL_DATA_MIN 2 +#define UVC_CTRL_DATA_MAX 3 +#define UVC_CTRL_DATA_RES 4 +#define UVC_CTRL_DATA_DEF 5 +#define UVC_CTRL_DATA_LAST 6 + +/* ------------------------------------------------------------------------ + * Controls + */ + +static const struct uvc_control_info uvc_ctrls[] = { + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_BRIGHTNESS_CONTROL, + .index = 0, + .size = 2, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_CONTRAST_CONTROL, + .index = 1, + .size = 2, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_HUE_CONTROL, + .index = 2, + .size = 2, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE + | UVC_CTRL_FLAG_AUTO_UPDATE, + }, + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_SATURATION_CONTROL, + .index = 3, + .size = 2, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_SHARPNESS_CONTROL, + .index = 4, + .size = 2, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_GAMMA_CONTROL, + .index = 5, + .size = 2, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_CONTROL, + .index = 6, + .size = 2, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE + | UVC_CTRL_FLAG_AUTO_UPDATE, + }, + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL, + .index = 7, + .size = 4, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE + | UVC_CTRL_FLAG_AUTO_UPDATE, + }, + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_BACKLIGHT_COMPENSATION_CONTROL, + .index = 8, + .size = 2, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_GAIN_CONTROL, + .index = 9, + .size = 2, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_POWER_LINE_FREQUENCY_CONTROL, + .index = 10, + .size = 1, + .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR + | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_HUE_AUTO_CONTROL, + .index = 11, + .size = 1, + .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR + | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL, + .index = 12, + .size = 1, + .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR + | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL, + .index = 13, + .size = 1, + .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR + | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_DIGITAL_MULTIPLIER_CONTROL, + .index = 14, + .size = 2, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_DIGITAL_MULTIPLIER_LIMIT_CONTROL, + .index = 15, + .size = 2, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_ANALOG_VIDEO_STANDARD_CONTROL, + .index = 16, + .size = 1, + .flags = UVC_CTRL_FLAG_GET_CUR, + }, + { + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_ANALOG_LOCK_STATUS_CONTROL, + .index = 17, + .size = 1, + .flags = UVC_CTRL_FLAG_GET_CUR, + }, + { + .entity = UVC_GUID_UVC_CAMERA, + .selector = UVC_CT_SCANNING_MODE_CONTROL, + .index = 0, + .size = 1, + .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR + | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_CAMERA, + .selector = UVC_CT_AE_MODE_CONTROL, + .index = 1, + .size = 1, + .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR + | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_GET_RES + | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_CAMERA, + .selector = UVC_CT_AE_PRIORITY_CONTROL, + .index = 2, + .size = 1, + .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR + | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_CAMERA, + .selector = UVC_CT_EXPOSURE_TIME_ABSOLUTE_CONTROL, + .index = 3, + .size = 4, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE + | UVC_CTRL_FLAG_AUTO_UPDATE, + }, + { + .entity = UVC_GUID_UVC_CAMERA, + .selector = UVC_CT_EXPOSURE_TIME_RELATIVE_CONTROL, + .index = 4, + .size = 1, + .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_CAMERA, + .selector = UVC_CT_FOCUS_ABSOLUTE_CONTROL, + .index = 5, + .size = 2, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE + | UVC_CTRL_FLAG_AUTO_UPDATE, + }, + { + .entity = UVC_GUID_UVC_CAMERA, + .selector = UVC_CT_FOCUS_RELATIVE_CONTROL, + .index = 6, + .size = 2, + .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_MIN + | UVC_CTRL_FLAG_GET_MAX | UVC_CTRL_FLAG_GET_RES + | UVC_CTRL_FLAG_GET_DEF + | UVC_CTRL_FLAG_AUTO_UPDATE, + }, + { + .entity = UVC_GUID_UVC_CAMERA, + .selector = UVC_CT_IRIS_ABSOLUTE_CONTROL, + .index = 7, + .size = 2, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE + | UVC_CTRL_FLAG_AUTO_UPDATE, + }, + { + .entity = UVC_GUID_UVC_CAMERA, + .selector = UVC_CT_IRIS_RELATIVE_CONTROL, + .index = 8, + .size = 1, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_AUTO_UPDATE, + }, + { + .entity = UVC_GUID_UVC_CAMERA, + .selector = UVC_CT_ZOOM_ABSOLUTE_CONTROL, + .index = 9, + .size = 2, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE + | UVC_CTRL_FLAG_AUTO_UPDATE, + }, + { + .entity = UVC_GUID_UVC_CAMERA, + .selector = UVC_CT_ZOOM_RELATIVE_CONTROL, + .index = 10, + .size = 3, + .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_MIN + | UVC_CTRL_FLAG_GET_MAX | UVC_CTRL_FLAG_GET_RES + | UVC_CTRL_FLAG_GET_DEF + | UVC_CTRL_FLAG_AUTO_UPDATE, + }, + { + .entity = UVC_GUID_UVC_CAMERA, + .selector = UVC_CT_PANTILT_ABSOLUTE_CONTROL, + .index = 11, + .size = 8, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE + | UVC_CTRL_FLAG_AUTO_UPDATE, + }, + { + .entity = UVC_GUID_UVC_CAMERA, + .selector = UVC_CT_PANTILT_RELATIVE_CONTROL, + .index = 12, + .size = 4, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_AUTO_UPDATE, + }, + { + .entity = UVC_GUID_UVC_CAMERA, + .selector = UVC_CT_ROLL_ABSOLUTE_CONTROL, + .index = 13, + .size = 2, + .flags = UVC_CTRL_FLAG_SET_CUR + | UVC_CTRL_FLAG_GET_RANGE + | UVC_CTRL_FLAG_RESTORE + | UVC_CTRL_FLAG_AUTO_UPDATE, + }, + { + .entity = UVC_GUID_UVC_CAMERA, + .selector = UVC_CT_ROLL_RELATIVE_CONTROL, + .index = 14, + .size = 2, + .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_MIN + | UVC_CTRL_FLAG_GET_MAX | UVC_CTRL_FLAG_GET_RES + | UVC_CTRL_FLAG_GET_DEF + | UVC_CTRL_FLAG_AUTO_UPDATE, + }, + { + .entity = UVC_GUID_UVC_CAMERA, + .selector = UVC_CT_FOCUS_AUTO_CONTROL, + .index = 17, + .size = 1, + .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR + | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE, + }, + { + .entity = UVC_GUID_UVC_CAMERA, + .selector = UVC_CT_PRIVACY_CONTROL, + .index = 18, + .size = 1, + .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR + | UVC_CTRL_FLAG_RESTORE + | UVC_CTRL_FLAG_AUTO_UPDATE, + }, + { + .entity = UVC_GUID_EXT_GPIO_CONTROLLER, + .selector = UVC_CT_PRIVACY_CONTROL, + .index = 0, + .size = 1, + .flags = UVC_CTRL_FLAG_GET_CUR + | UVC_CTRL_FLAG_AUTO_UPDATE, + }, +}; + +static const u32 uvc_control_classes[] = { + V4L2_CID_CAMERA_CLASS, + V4L2_CID_USER_CLASS, +}; + +static const struct uvc_menu_info power_line_frequency_controls[] = { + { 0, "Disabled" }, + { 1, "50 Hz" }, + { 2, "60 Hz" }, + { 3, "Auto" }, +}; + +static const struct uvc_menu_info exposure_auto_controls[] = { + { 2, "Auto Mode" }, + { 1, "Manual Mode" }, + { 4, "Shutter Priority Mode" }, + { 8, "Aperture Priority Mode" }, +}; + +static s32 uvc_ctrl_get_zoom(struct uvc_control_mapping *mapping, + u8 query, const u8 *data) +{ + s8 zoom = (s8)data[0]; + + switch (query) { + case UVC_GET_CUR: + return (zoom == 0) ? 0 : (zoom > 0 ? data[2] : -data[2]); + + case UVC_GET_MIN: + case UVC_GET_MAX: + case UVC_GET_RES: + case UVC_GET_DEF: + default: + return data[2]; + } +} + +static void uvc_ctrl_set_zoom(struct uvc_control_mapping *mapping, + s32 value, u8 *data) +{ + data[0] = value == 0 ? 0 : (value > 0) ? 1 : 0xff; + data[2] = min((int)abs(value), 0xff); +} + +static s32 uvc_ctrl_get_rel_speed(struct uvc_control_mapping *mapping, + u8 query, const u8 *data) +{ + unsigned int first = mapping->offset / 8; + s8 rel = (s8)data[first]; + + switch (query) { + case UVC_GET_CUR: + return (rel == 0) ? 0 : (rel > 0 ? data[first+1] + : -data[first+1]); + case UVC_GET_MIN: + return -data[first+1]; + case UVC_GET_MAX: + case UVC_GET_RES: + case UVC_GET_DEF: + default: + return data[first+1]; + } +} + +static void uvc_ctrl_set_rel_speed(struct uvc_control_mapping *mapping, + s32 value, u8 *data) +{ + unsigned int first = mapping->offset / 8; + + data[first] = value == 0 ? 0 : (value > 0) ? 1 : 0xff; + data[first+1] = min_t(int, abs(value), 0xff); +} + +static const struct uvc_control_mapping uvc_ctrl_mappings[] = { + { + .id = V4L2_CID_BRIGHTNESS, + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_BRIGHTNESS_CONTROL, + .size = 16, + .offset = 0, + .v4l2_type = V4L2_CTRL_TYPE_INTEGER, + .data_type = UVC_CTRL_DATA_TYPE_SIGNED, + }, + { + .id = V4L2_CID_CONTRAST, + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_CONTRAST_CONTROL, + .size = 16, + .offset = 0, + .v4l2_type = V4L2_CTRL_TYPE_INTEGER, + .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, + }, + { + .id = V4L2_CID_HUE, + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_HUE_CONTROL, + .size = 16, + .offset = 0, + .v4l2_type = V4L2_CTRL_TYPE_INTEGER, + .data_type = UVC_CTRL_DATA_TYPE_SIGNED, + .master_id = V4L2_CID_HUE_AUTO, + .master_manual = 0, + }, + { + .id = V4L2_CID_SATURATION, + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_SATURATION_CONTROL, + .size = 16, + .offset = 0, + .v4l2_type = V4L2_CTRL_TYPE_INTEGER, + .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, + }, + { + .id = V4L2_CID_SHARPNESS, + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_SHARPNESS_CONTROL, + .size = 16, + .offset = 0, + .v4l2_type = V4L2_CTRL_TYPE_INTEGER, + .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, + }, + { + .id = V4L2_CID_GAMMA, + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_GAMMA_CONTROL, + .size = 16, + .offset = 0, + .v4l2_type = V4L2_CTRL_TYPE_INTEGER, + .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, + }, + { + .id = V4L2_CID_BACKLIGHT_COMPENSATION, + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_BACKLIGHT_COMPENSATION_CONTROL, + .size = 16, + .offset = 0, + .v4l2_type = V4L2_CTRL_TYPE_INTEGER, + .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, + }, + { + .id = V4L2_CID_GAIN, + .entity = UVC_GUID_UVC_PROCESSING, + .selector = UVC_PU_GAIN_CONTROL, + .size = 16, + .offset = 0, + .v4l2_type = V4L2_CTRL_TYPE_INTEGER, + .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, + }, + { + .id = V4L2_CID_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, }, + }, + { + .id = V4L2_CID_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_mask = GENMASK(V4L2_EXPOSURE_APERTURE_PRIORITY, + V4L2_EXPOSURE_AUTO), + .slave_ids = { V4L2_CID_EXPOSURE_ABSOLUTE, }, + }, + { + .id = V4L2_CID_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, + .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, + .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, + .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, + .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, + .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, + .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, + .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, + .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, + .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, + .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, + .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, + .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, + .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, + .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, + .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, + .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, + .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, + }, + { + .id = V4L2_CID_PRIVACY, + .entity = UVC_GUID_EXT_GPIO_CONTROLLER, + .selector = UVC_CT_PRIVACY_CONTROL, + .size = 1, + .offset = 0, + .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN, + .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN, + }, +}; + +const struct uvc_control_mapping uvc_ctrl_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, + .menu_mask = GENMASK(V4L2_CID_POWER_LINE_FREQUENCY_60HZ, + V4L2_CID_POWER_LINE_FREQUENCY_50HZ), +}; + +static const struct uvc_control_mapping uvc_ctrl_power_line_mapping_uvc11 = { + .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, + .menu_mask = GENMASK(V4L2_CID_POWER_LINE_FREQUENCY_60HZ, + V4L2_CID_POWER_LINE_FREQUENCY_DISABLED), +}; + +static const struct uvc_control_mapping *uvc_ctrl_mappings_uvc11[] = { + &uvc_ctrl_power_line_mapping_uvc11, + NULL, /* Sentinel */ +}; + +static const struct uvc_control_mapping uvc_ctrl_power_line_mapping_uvc15 = { + .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, + .menu_mask = GENMASK(V4L2_CID_POWER_LINE_FREQUENCY_AUTO, + V4L2_CID_POWER_LINE_FREQUENCY_DISABLED), +}; + +static const struct uvc_control_mapping *uvc_ctrl_mappings_uvc15[] = { + &uvc_ctrl_power_line_mapping_uvc15, + NULL, /* Sentinel */ +}; + +/* ------------------------------------------------------------------------ + * 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 int uvc_entity_match_guid(const struct uvc_entity *entity, + const u8 guid[16]) +{ + return memcmp(entity->guid, guid, sizeof(entity->guid)) == 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_dbg(chain->dev, 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; BIT(i) <= mapping->menu_mask; ++i, ++menu) { + if (!test_bit(i, &mapping->menu_mask)) + continue; + if (menu->value == value) { + value = i; + break; + } + } + } + + return value; +} + +static int __uvc_ctrl_load_cur(struct uvc_video_chain *chain, + struct uvc_control *ctrl) +{ + u8 *data; + int ret; + + if (ctrl->loaded) + return 0; + + data = uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT); + + if ((ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR) == 0) { + memset(data, 0, ctrl->info.size); + ctrl->loaded = 1; + + return 0; + } + + if (ctrl->entity->get_cur) + ret = ctrl->entity->get_cur(chain->dev, ctrl->entity, + ctrl->info.selector, data, + ctrl->info.size); + else + ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, + ctrl->entity->id, chain->dev->intfnum, + ctrl->info.selector, data, + ctrl->info.size); + + if (ret < 0) + return ret; + + ctrl->loaded = 1; + + return ret; +} + +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; + + ret = __uvc_ctrl_load_cur(chain, ctrl); + if (ret < 0) + return ret; + + *value = __uvc_ctrl_get_value(mapping, + uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT)); + + return 0; +} + +static int __uvc_query_v4l2_class(struct uvc_video_chain *chain, u32 req_id, + u32 found_id) +{ + bool find_next = req_id & V4L2_CTRL_FLAG_NEXT_CTRL; + unsigned int i; + + req_id &= V4L2_CTRL_ID_MASK; + + for (i = 0; i < ARRAY_SIZE(uvc_control_classes); i++) { + if (!(chain->ctrl_class_bitmap & BIT(i))) + continue; + if (!find_next) { + if (uvc_control_classes[i] == req_id) + return i; + continue; + } + if (uvc_control_classes[i] > req_id && + uvc_control_classes[i] < found_id) + return i; + } + + return -ENODEV; +} + +static int uvc_query_v4l2_class(struct uvc_video_chain *chain, u32 req_id, + u32 found_id, struct v4l2_queryctrl *v4l2_ctrl) +{ + int idx; + + idx = __uvc_query_v4l2_class(chain, req_id, found_id); + if (idx < 0) + return -ENODEV; + + memset(v4l2_ctrl, 0, sizeof(*v4l2_ctrl)); + v4l2_ctrl->id = uvc_control_classes[idx]; + strscpy(v4l2_ctrl->name, v4l2_ctrl_get_name(v4l2_ctrl->id), + sizeof(v4l2_ctrl->name)); + v4l2_ctrl->type = V4L2_CTRL_TYPE_CTRL_CLASS; + v4l2_ctrl->flags = V4L2_CTRL_FLAG_WRITE_ONLY + | V4L2_CTRL_FLAG_READ_ONLY; + return 0; +} + +/* + * Check if control @v4l2_id can be accessed by the given control @ioctl + * (VIDIOC_G_EXT_CTRLS, VIDIOC_TRY_EXT_CTRLS or VIDIOC_S_EXT_CTRLS). + * + * For set operations on slave controls, check if the master's value is set to + * manual, either in the others controls set in the same ioctl call, or from + * the master's current value. This catches VIDIOC_S_EXT_CTRLS calls that set + * both the master and slave control, such as for instance setting + * auto_exposure=1, exposure_time_absolute=251. + */ +int uvc_ctrl_is_accessible(struct uvc_video_chain *chain, u32 v4l2_id, + const struct v4l2_ext_controls *ctrls, + unsigned long ioctl) +{ + struct uvc_control_mapping *master_map = NULL; + struct uvc_control *master_ctrl = NULL; + struct uvc_control_mapping *mapping; + struct uvc_control *ctrl; + bool read = ioctl == VIDIOC_G_EXT_CTRLS; + s32 val; + int ret; + int i; + + if (__uvc_query_v4l2_class(chain, v4l2_id, 0) >= 0) + return -EACCES; + + ctrl = uvc_find_control(chain, v4l2_id, &mapping); + if (!ctrl) + return -EINVAL; + + if (!(ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR) && read) + return -EACCES; + + if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR) && !read) + return -EACCES; + + if (ioctl != VIDIOC_S_EXT_CTRLS || !mapping->master_id) + return 0; + + /* + * Iterate backwards in cases where the master control is accessed + * multiple times in the same ioctl. We want the last value. + */ + for (i = ctrls->count - 1; i >= 0; i--) { + if (ctrls->controls[i].id == mapping->master_id) + return ctrls->controls[i].value == + mapping->master_manual ? 0 : -EACCES; + } + + __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)) + return 0; + + ret = __uvc_ctrl_get(chain, master_ctrl, master_map, &val); + if (ret >= 0 && val != mapping->master_manual) + return -EACCES; + + return 0; +} + +static const char *uvc_map_get_name(const struct uvc_control_mapping *map) +{ + const char *name; + + if (map->name) + return map->name; + + name = v4l2_ctrl_get_name(map->id); + if (name) + return name; + + return "Unknown Control"; +} + +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, uvc_map_get_name(mapping), + 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 = ffs(mapping->menu_mask) - 1; + v4l2_ctrl->maximum = fls(mapping->menu_mask) - 1; + v4l2_ctrl->step = 1; + + menu = mapping->menu_info; + for (i = 0; BIT(i) <= mapping->menu_mask; ++i, ++menu) { + if (!test_bit(i, &mapping->menu_mask)) + continue; + 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; + + /* Check if the ctrl is a know class */ + if (!(v4l2_ctrl->id & V4L2_CTRL_FLAG_NEXT_CTRL)) { + ret = uvc_query_v4l2_class(chain, v4l2_ctrl->id, 0, v4l2_ctrl); + if (!ret) + goto done; + } + + ctrl = uvc_find_control(chain, v4l2_ctrl->id, &mapping); + if (ctrl == NULL) { + ret = -EINVAL; + goto done; + } + + /* + * If we're enumerating control with V4L2_CTRL_FLAG_NEXT_CTRL, check if + * a class should be inserted between the previous control and the one + * we have just found. + */ + if (v4l2_ctrl->id & V4L2_CTRL_FLAG_NEXT_CTRL) { + ret = uvc_query_v4l2_class(chain, v4l2_ctrl->id, mapping->id, + v4l2_ctrl); + if (!ret) + 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; + + if (index >= BITS_PER_TYPE(mapping->menu_mask)) + return -EINVAL; + + 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 (!test_bit(query_menu->index, &mapping->menu_mask)) { + 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); +} + +void uvc_ctrl_status_event(struct uvc_video_chain *chain, + struct uvc_control *ctrl, const u8 *data) +{ + struct uvc_control_mapping *mapping; + struct uvc_fh *handle; + unsigned int i; + + 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, 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); +} + +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; + int ret; + + uvc_ctrl_status_event(w->chain, w->ctrl, w->data); + + /* The barrier is needed to synchronize with uvc_status_stop(). */ + if (smp_load_acquire(&dev->flush_status)) + return; + + /* Resubmit the URB. */ + w->urb->interval = dev->int_ep->desc.bInterval; + ret = usb_submit_urb(w->urb, GFP_KERNEL); + if (ret < 0) + dev_err(&dev->udev->dev, + "Failed to resubmit status URB (%d).\n", ret); +} + +bool uvc_ctrl_status_event_async(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; + + if (__uvc_query_v4l2_class(handle->chain, sev->id, 0) >= 0) { + ret = 0; + goto done; + } + + 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); + if (__uvc_query_v4l2_class(handle->chain, sev->id, 0) >= 0) + goto done; + list_del(&sev->node); +done: + 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 **err_ctrl) +{ + 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) { + if (err_ctrl) + *err_ctrl = ctrl; + return ret; + } + } + + return 0; +} + +static int uvc_ctrl_find_ctrl_idx(struct uvc_entity *entity, + struct v4l2_ext_controls *ctrls, + struct uvc_control *uvc_control) +{ + struct uvc_control_mapping *mapping = NULL; + struct uvc_control *ctrl_found = NULL; + unsigned int i; + + if (!entity) + return ctrls->count; + + for (i = 0; i < ctrls->count; i++) { + __uvc_find_control(entity, ctrls->controls[i].id, &mapping, + &ctrl_found, 0); + if (uvc_control == ctrl_found) + return i; + } + + return ctrls->count; +} + +int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback, + struct v4l2_ext_controls *ctrls) +{ + struct uvc_video_chain *chain = handle->chain; + struct uvc_control *err_ctrl; + 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, + &err_ctrl); + if (ret < 0) + goto done; + } + + if (!rollback) + uvc_ctrl_send_events(handle, ctrls->controls, ctrls->count); +done: + if (ret < 0 && ctrls) + ctrls->error_idx = uvc_ctrl_find_ctrl_idx(entity, ctrls, + err_ctrl); + 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; + + if (__uvc_query_v4l2_class(chain, xctrl->id, 0) >= 0) + return -EACCES; + + 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; + + if (__uvc_query_v4l2_class(chain, xctrl->id, 0) >= 0) + return -EACCES; + + 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 + DIV_ROUND_CLOSEST((u32)(xctrl->value - min), + 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 < (ffs(mapping->menu_mask) - 1) || + xctrl->value > (fls(mapping->menu_mask) - 1)) + return -ERANGE; + + if (!test_bit(xctrl->value, &mapping->menu_mask)) + return -EINVAL; + + 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->info.size * 8) != mapping->size) { + ret = __uvc_ctrl_load_cur(chain, ctrl); + if (ret < 0) + return ret; + } + + /* 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; + + if (ctrl->entity->get_info) + ret = ctrl->entity->get_info(dev, ctrl->entity, + ctrl->info.selector, data); + else + 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->guid, 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_dbg(dev, 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_dbg(dev, 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_dbg(dev, 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_dbg(dev, 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_dbg(chain->dev, 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_dbg(chain->dev, CONTROL, "Control %pUl/%u not found\n", + entity->guid, 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; + dev_dbg(&dev->udev->dev, + "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, NULL); + 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_dbg(dev, 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_video_chain *chain, + struct uvc_control *ctrl, const struct uvc_control_mapping *mapping) +{ + struct uvc_control_mapping *map; + unsigned int size; + unsigned int i; + + /* + * 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; + + /* For UVCIOC_CTRL_MAP custom control */ + if (mapping->name) { + map->name = kstrdup(mapping->name, GFP_KERNEL); + if (!map->name) { + kfree(map); + return -ENOMEM; + } + } + + INIT_LIST_HEAD(&map->ev_subs); + + size = sizeof(*mapping->menu_info) * fls(mapping->menu_mask); + map->menu_info = kmemdup(mapping->menu_info, size, GFP_KERNEL); + if (map->menu_info == NULL) { + kfree(map->name); + kfree(map); + return -ENOMEM; + } + + if (map->get == NULL) + map->get = uvc_get_le_value; + if (map->set == NULL) + map->set = uvc_set_le_value; + + for (i = 0; i < ARRAY_SIZE(uvc_control_classes); i++) { + if (V4L2_CTRL_ID2WHICH(uvc_control_classes[i]) == + V4L2_CTRL_ID2WHICH(map->id)) { + chain->ctrl_class_bitmap |= BIT(i); + break; + } + } + + list_add_tail(&map->list, &ctrl->info.mappings); + uvc_dbg(chain->dev, CONTROL, "Adding mapping '%s' to control %pUl/%u\n", + uvc_map_get_name(map), 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_dbg(dev, CONTROL, + "Can't add mapping '%s', control id 0x%08x is invalid\n", + uvc_map_get_name(mapping), 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_dbg(dev, CONTROL, + "Can't add mapping '%s', control id 0x%08x already exists\n", + uvc_map_get_name(mapping), 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_dbg(dev, CONTROL, + "Can't add mapping '%s', maximum mappings count (%u) exceeded\n", + uvc_map_get_name(mapping), UVC_MAX_CONTROL_MAPPINGS); + ret = -ENOMEM; + goto done; + } + + ret = __uvc_ctrl_add_mapping(chain, 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_dbg(dev, 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_video_chain *chain, + struct uvc_control *ctrl) +{ + const struct uvc_control_mapping **mappings; + unsigned int i; + + /* + * 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 (i = 0; i < ARRAY_SIZE(uvc_ctrls); ++i) { + const struct uvc_control_info *info = &uvc_ctrls[i]; + + if (uvc_entity_match_guid(ctrl->entity, info->entity) && + ctrl->index == info->index) { + uvc_ctrl_add_info(chain->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(chain->dev, ctrl, &ctrl->info); + break; + } + } + + if (!ctrl->initialized) + return; + + /* + * First check if the device provides a custom mapping for this control, + * used to override standard mappings for non-conformant devices. Don't + * process standard mappings if a custom mapping is found. This + * mechanism doesn't support combining standard and custom mappings for + * a single control. + */ + if (chain->dev->info->mappings) { + bool custom = false; + + for (i = 0; chain->dev->info->mappings[i]; ++i) { + const struct uvc_control_mapping *mapping = + chain->dev->info->mappings[i]; + + if (uvc_entity_match_guid(ctrl->entity, mapping->entity) && + ctrl->info.selector == mapping->selector) { + __uvc_ctrl_add_mapping(chain, ctrl, mapping); + custom = true; + } + } + + if (custom) + return; + } + + /* Process common mappings next. */ + for (i = 0; i < ARRAY_SIZE(uvc_ctrl_mappings); ++i) { + const struct uvc_control_mapping *mapping = &uvc_ctrl_mappings[i]; + + if (uvc_entity_match_guid(ctrl->entity, mapping->entity) && + ctrl->info.selector == mapping->selector) + __uvc_ctrl_add_mapping(chain, ctrl, mapping); + } + + /* Finally process version-specific mappings. */ + mappings = chain->dev->uvc_version < 0x0150 + ? uvc_ctrl_mappings_uvc11 : uvc_ctrl_mappings_uvc15; + + for (i = 0; mappings[i]; ++i) { + const struct uvc_control_mapping *mapping = mappings[i]; + + if (uvc_entity_match_guid(ctrl->entity, mapping->entity) && + ctrl->info.selector == mapping->selector) + __uvc_ctrl_add_mapping(chain, ctrl, mapping); + } +} + +/* + * Initialize device controls. + */ +static int uvc_ctrl_init_chain(struct uvc_video_chain *chain) +{ + struct uvc_entity *entity; + unsigned int i; + + /* Walk the entities list and instantiate controls */ + list_for_each_entry(entity, &chain->entities, chain) { + 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; + } else if (UVC_ENTITY_TYPE(entity) == UVC_EXT_GPIO_UNIT) { + bmControls = entity->gpio.bmControls; + bControlSize = entity->gpio.bControlSize; + } + + /* Remove bogus/blacklisted controls */ + uvc_ctrl_prune_entity(chain->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(chain, ctrl); + ctrl++; + } + } + + return 0; +} + +int uvc_ctrl_init_device(struct uvc_device *dev) +{ + struct uvc_video_chain *chain; + int ret; + + INIT_WORK(&dev->async_ctrl.work, uvc_ctrl_status_event_work); + + list_for_each_entry(chain, &dev->chains, list) { + ret = uvc_ctrl_init_chain(chain); + if (ret) + return ret; + } + + 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->name); + 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); + } +} |