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linux/drivers/media/video/uvc/uvc_ctrl.c
Thomas Meyer d0d97488dd [media] uvcvideo: Use kcalloc instead of kzalloc to allocate array 
The advantage of kcalloc is, that will prevent integer overflows which could
result from the multiplication of number of elements and size and it is also
a bit nicer to read.

The semantic patch that makes this change is available
in https://lkml.org/lkml/2011/11/25/107

Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-12-30 17:22:12 -02:00

1934 lines
49 KiB
C
Raw Blame History

/*
* uvc_ctrl.c -- USB Video Class driver - Controls
*
* Copyright (C) 2005-2010
* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*/
#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/atomic.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 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,
},
{
.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_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_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,
},
};
static struct uvc_menu_info power_line_frequency_controls[] = {
{ 0, "Disabled" },
{ 1, "50 Hz" },
{ 2, "60 Hz" },
};
static 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 struct uvc_control_mapping uvc_ctrl_mappings[] = {
{
.id = V4L2_CID_BRIGHTNESS,
.name = "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,
.name = "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,
.name = "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,
},
{
.id = V4L2_CID_SATURATION,
.name = "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,
.name = "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,
.name = "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,
.name = "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,
.name = "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_POWER_LINE_FREQUENCY,
.name = "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_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,
},
{
.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),
},
{
.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,
},
{
.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,
},
{
.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,
},
{
.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,
},
{
.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,
},
{
.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,
},
{
.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,
},
{
.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,
},
{
.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_UNSIGNED,
},
{
.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_UNSIGNED,
},
{
.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;
for (; bits > 0; data++) {
__u8 byte = *data & mask;
value |= offset > 0 ? (byte >> offset) : (byte << (-offset));
bits -= 8 - (offset > 0 ? offset : 0);
offset -= 8;
mask = (1 << bits) - 1;
}
/* 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;
}
int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
struct v4l2_queryctrl *v4l2_ctrl)
{
struct uvc_control *ctrl;
struct uvc_control_mapping *mapping;
struct uvc_menu_info *menu;
unsigned int i;
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;
}
memset(v4l2_ctrl, 0, sizeof *v4l2_ctrl);
v4l2_ctrl->id = mapping->id;
v4l2_ctrl->type = mapping->v4l2_type;
strlcpy(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 (!ctrl->cached) {
ret = uvc_ctrl_populate_cache(chain, ctrl);
if (ret < 0)
goto done;
}
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;
}
}
goto done;
case V4L2_CTRL_TYPE_BOOLEAN:
v4l2_ctrl->minimum = 0;
v4l2_ctrl->maximum = 1;
v4l2_ctrl->step = 1;
goto done;
case V4L2_CTRL_TYPE_BUTTON:
v4l2_ctrl->minimum = 0;
v4l2_ctrl->maximum = 0;
v4l2_ctrl->step = 0;
goto done;
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));
done:
mutex_unlock(&chain->ctrl_mutex);
return ret;
}
/*
* Mapping V4L2 controls to UVC controls can be straighforward 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)
{
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;
}
}
strlcpy(query_menu->name, menu_info->name, sizeof query_menu->name);
done:
mutex_unlock(&chain->ctrl_mutex);
return ret;
}
/* --------------------------------------------------------------------------
* 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.
*/
if (ctrl->info.flags & UVC_CTRL_FLAG_AUTO_UPDATE)
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_video_chain *chain, int rollback)
{
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;
}
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;
struct uvc_menu_info *menu;
unsigned int i;
int ret;
ctrl = uvc_find_control(chain, xctrl->id, &mapping);
if (ctrl == NULL || (ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR) == 0)
return -EINVAL;
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;
}
xctrl->value = mapping->get(mapping, UVC_GET_CUR,
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
menu = mapping->menu_info;
for (i = 0; i < mapping->menu_count; ++i, ++menu) {
if (menu->value == xctrl->value) {
xctrl->value = i;
break;
}
}
}
return 0;
}
int uvc_ctrl_set(struct uvc_video_chain *chain,
struct v4l2_ext_control *xctrl)
{
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 || (ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR) == 0)
return -EINVAL;
/* 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 + (xctrl->value - min + step/2) / step * step;
xctrl->value = clamp(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 -ERANGE;
}
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));
ctrl->dirty = 1;
ctrl->modified = 1;
return 0;
}
/* --------------------------------------------------------------------------
* Dynamic controls
*/
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);
/* Query the control information (GET_INFO) */
ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum,
info->selector, data, 1);
if (ret < 0) {
uvc_trace(UVC_TRACE_CONTROL,
"GET_INFO failed on control %pUl/%u (%d).\n",
info->entity, info->selector, ret);
goto done;
}
info->flags = UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX
| UVC_CTRL_FLAG_GET_RES | UVC_CTRL_FLAG_GET_DEF
| (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);
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, found = 0;
__u32 reqflags;
__u16 size;
__u8 *data = NULL;
int ret;
/* Find the extension unit. */
list_for_each_entry(entity, &chain->entities, chain) {
if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT &&
entity->id == xqry->unit)
break;
}
if (entity->id != xqry->unit) {
uvc_trace(UVC_TRACE_CONTROL, "Extension unit %u not found.\n",
xqry->unit);
return -ENOENT;
}
/* Find the control and perform delayed initialization if needed. */
for (i = 0; i < entity->ncontrols; ++i) {
ctrl = &entity->controls[i];
if (ctrl->index == xqry->selector - 1) {
found = 1;
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_resume_device(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)
{
int ret = 0;
memcpy(&ctrl->info, info, sizeof(*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 == NULL) {
ret = -ENOMEM;
goto done;
}
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);
done:
if (ret < 0)
kfree(ctrl->uvc_data);
return ret;
}
/*
* 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;
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;
map->ctrl = &ctrl->info;
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;
}
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);
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;
/* Walk the entities list and instantiate controls */
list_for_each_entry(entity, &dev->entities, list) {
struct uvc_control *ctrl;
unsigned int bControlSize = 0, ncontrols = 0;
__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 */
for (i = 0; i < bControlSize; ++i)
ncontrols += hweight8(bmControls[i]);
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;
/* 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);
}
}
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