uvc摄像头代码解析5
8.初始化uvc控制
8.1 重要结构体
struct uvc_control { //uvc控制
struct uvc_entity *entity; //uvc实体
struct uvc_control_info info; //uvc控制信息
__u8 index; //索引值
__u8 dirty:1,
loaded:1,
modified:1,
cached:1,
initialized:1; //初始化标志
__u8 *uvc_data; //uvc控制数据
};
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) { //遍历uvc设备实体entities链表
struct uvc_control *ctrl; //uvc控制
unsigned int bControlSize = 0, ncontrols = 0;
__u8 *bmControls = NULL;
if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT) { //扩展Unit
bmControls = entity->extension.bmControls; //控制位图
bControlSize = entity->extension.bControlSize; //控制位域大小
}
else if (UVC_ENTITY_TYPE(entity) == UVC_VC_PROCESSING_UNIT) { //处理Unit
bmControls = entity->processing.bmControls; //控制位图
bControlSize = entity->processing.bControlSize; //控制位域大小
}
else if (UVC_ENTITY_TYPE(entity) == UVC_ITT_CAMERA) { //输入Terminal Camera
bmControls = entity->camera.bmControls; //控制位图
bControlSize = entity->camera.bControlSize; //控制位域大小
}
/* Remove bogus/blacklisted controls 移除假的/黑名单控制组件*/
uvc_ctrl_prune_entity(dev, entity);
/* Count supported controls and allocate the controls array */
for (i = 0; i < bControlSize; ++i)
ncontrols += hweight8(bmControls[i]); //统计控制组件个数
if (ncontrols == 0)
continue;
entity->controls = kzalloc(ncontrols * sizeof(*ctrl),GFP_KERNEL); //分配ncontrols个uvc控制内存
if (entity->controls == NULL)
return -ENOMEM;
entity->ncontrols = ncontrols; //设置uvc控制个数
/* Initialize all supported controls */
ctrl = entity->controls; //指向uvc控制数组
for (i = 0; i < bControlSize * 8; ++i) {
if (uvc_test_bit(bmControls, i) == 0) //跳过控制位域没设置1的
continue;
ctrl->entity = entity; //捆绑uvc实体和uvc控制
ctrl->index = i; //设置控制位域索引
uvc_ctrl_init_ctrl(dev, ctrl); //9初始化uvc控件
ctrl++; //uvc控制 指向下一个uvc控制数组项
}
}
return 0;
}9初始化uvc控件
9.1 相关结构体
9.1.1 uvc控制信息
struct uvc_control_info { //uvc控制信息
struct list_head mappings; //uvc控制位图链表头
__u8 entity[16];
__u8 index; /* Bit index in bmControls */
__u8 selector;
__u16 size;
__u32 flags;
};
struct uvc_control_mapping { //uvc控制位图
struct list_head list; //链表
struct uvc_control_info *ctrl; //uvc控制信息
__u32 id;
__u8 name[32];
__u8 entity[16];
__u8 selector;
__u8 size;
__u8 offset;
enum v4l2_ctrl_type v4l2_type; //v4l2控制类型
__u32 data_type;
struct uvc_menu_info *menu_info; //uvc菜单信息
__u32 menu_count; //uvc菜单个数
__s32 (*get) (struct uvc_control_mapping *mapping, __u8 query,const __u8 *data);
void (*set) (struct uvc_control_mapping *mapping, __s32 value,__u8 *data);
};
9.2 初始化uvc控制
static void uvc_ctrl_init_ctrl(struct uvc_device *dev, struct uvc_control *ctrl)
{
const struct uvc_control_info *info = uvc_ctrls; //指向全局静态uvc控制信息数组
const struct uvc_control_info *iend = info + ARRAY_SIZE(uvc_ctrls); //指向数组末端
const struct uvc_control_mapping *mapping = uvc_ctrl_mappings; //指向全局静态uvc控制位图数组
const struct uvc_control_mapping *mend = mapping + ARRAY_SIZE(uvc_ctrl_mappings); //指向数组末端
if (UVC_ENTITY_TYPE(ctrl->entity) == UVC_VC_EXTENSION_UNIT) //ctrl->entity->type为扩展Unit(延后扩展Unit的初始化到当它第一次使用)
return;
for (; info < iend; ++info) { //遍历整个uvc控制信息数据
if (uvc_entity_match_guid(ctrl->entity, info->entity) && ctrl->index == info->index) { //匹配条件
uvc_ctrl_add_info(dev, ctrl, info); //添加uvc控制信息
break;
}
}
if (!ctrl->initialized) //已经给初始化
return;
for (; mapping < mend; ++mapping) { //遍历整个uvc控制位图数组
if (uvc_entity_match_guid(ctrl->entity, mapping->entity) && ctrl->info.selector == mapping->selector) //匹配条件
__uvc_ctrl_add_mapping(dev, ctrl, mapping); //添加控制位图
}
}
9.2.1 全局静态uvc控制信息数组uvc-ctrls
static struct uvc_control_info uvc_ctrls[] = {
{ //背光控制
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_BRIGHTNESS_CONTROL,
.index = 0,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE,
},
{ //对比度控制
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_CONTRAST_CONTROL,
.index = 1,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE,
},
{ //色度控制
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_HUE_CONTROL,
.index = 2,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
},
{ //饱和度控制
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_SATURATION_CONTROL,
.index = 3,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE,
},
{ //锐度控制
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_SHARPNESS_CONTROL,
.index = 4,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE,
},
{ //gamma设置
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_GAMMA_CONTROL,
.index = 5,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE,
},
{ //白平衡温度控制
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
.index = 6,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
},
{ //白平衡组件
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL,
.index = 7,
.size = 4,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
},
{ //背光补偿
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_BACKLIGHT_COMPENSATION_CONTROL,
.index = 8,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE,
},
{ //增益
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_GAIN_CONTROL,
.index = 9,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE,
},
{ //电源线频率
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
.index = 10,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR| UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
},
{ //自动色度调节
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_HUE_AUTO_CONTROL,
.index = 11,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR| UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
},
{ //白平衡色温自动调节
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
.index = 12,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR| UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
},
{ //白平衡自动调节
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
.index = 13,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR| UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
},
{ //数字多功能控制
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_DIGITAL_MULTIPLIER_CONTROL,
.index = 14,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE,
},
{ //数字多功能限制控制
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_DIGITAL_MULTIPLIER_LIMIT_CONTROL,
.index = 15,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE,
},
{ //模拟视频标准控制
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_ANALOG_VIDEO_STANDARD_CONTROL,
.index = 16,
.size = 1,
.flags = UVC_CONTROL_GET_CUR,
},
{ //模拟视频锁存状态
.entity = UVC_GUID_UVC_PROCESSING,
.selector = UVC_PU_ANALOG_LOCK_STATUS_CONTROL,
.index = 17,
.size = 1,
.flags = UVC_CONTROL_GET_CUR,
},
{ //扫描模式
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_SCANNING_MODE_CONTROL,
.index = 0,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR| UVC_CONTROL_RESTORE,
},
{ //。。。
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_AE_MODE_CONTROL,
.index = 1,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR| UVC_CONTROL_GET_DEF | UVC_CONTROL_GET_RES| UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_AE_PRIORITY_CONTROL,
.index = 2,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR| UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
.index = 3,
.size = 4,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_EXPOSURE_TIME_RELATIVE_CONTROL,
.index = 4,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_FOCUS_ABSOLUTE_CONTROL,
.index = 5,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_FOCUS_RELATIVE_CONTROL,
.index = 6,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_MIN| UVC_CONTROL_GET_MAX | UVC_CONTROL_GET_RES| UVC_CONTROL_GET_DEF | UVC_CONTROL_AUTO_UPDATE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_IRIS_ABSOLUTE_CONTROL,
.index = 7,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_IRIS_RELATIVE_CONTROL,
.index = 8,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_AUTO_UPDATE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_ZOOM_ABSOLUTE_CONTROL,
.index = 9,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_ZOOM_RELATIVE_CONTROL,
.index = 10,
.size = 3,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_MIN| UVC_CONTROL_GET_MAX | UVC_CONTROL_GET_RES| UVC_CONTROL_GET_DEF | UVC_CONTROL_AUTO_UPDATE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_PANTILT_ABSOLUTE_CONTROL,
.index = 11,
.size = 8,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_PANTILT_RELATIVE_CONTROL,
.index = 12,
.size = 4,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_MIN| UVC_CONTROL_GET_MAX | UVC_CONTROL_GET_RES| UVC_CONTROL_GET_DEF | UVC_CONTROL_AUTO_UPDATE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_ROLL_ABSOLUTE_CONTROL,
.index = 13,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE| UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_ROLL_RELATIVE_CONTROL,
.index = 14,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_MIN
| UVC_CONTROL_GET_MAX | UVC_CONTROL_GET_RES
| UVC_CONTROL_GET_DEF | UVC_CONTROL_AUTO_UPDATE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_FOCUS_AUTO_CONTROL,
.index = 17,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR| UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = UVC_CT_PRIVACY_CONTROL,
.index = 18,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR| UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
},
};
9.2.2 全局静态uvc控制位图数组(uvc_ctrl_mappings)
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,
},
};
9.2.3 添加uvc控制信息
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)); //初始化uvc控制的uvc控制信息对象
INIT_LIST_HEAD(&ctrl->info.mappings); //初始化uvc控制信息的uvc链表头
/* 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); //分配uvc控制数据内存
if (ctrl->uvc_data == NULL) {
ret = -ENOMEM;
goto done;
}
ctrl->initialized = 1; //设置uvc控制初始化标准
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;
}
9.2.4 添加uvc位图
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;
map = kmemdup(mapping, sizeof(*mapping), GFP_KERNEL); //分配uvc控制位图内存
if (map == NULL)
return -ENOMEM;
size = sizeof(*mapping->menu_info) * mapping->menu_count; //计算uvc菜单数组占用空间
map->menu_info = kmemdup(mapping->menu_info, size, GFP_KERNEL); //分配uvc菜单数组内存
if (map->menu_info == NULL) {
kfree(map);
return -ENOMEM;
}
if (map->get == NULL)
map->get = uvc_get_le_value; //设置默认获取方法
if (map->set == NULL)
map->set = uvc_set_le_value; //设置默认设置方法
map->ctrl = &ctrl->info; //捆绑uvc控制信息和uvc控制信息位图
list_add_tail(&map->list, &ctrl->info.mappings); //添加uvc控制位图到uvc控制信息的位图链表
uvc_trace(UVC_TRACE_CONTROL,"Adding mapping '%s' to control %pUl/%u.\n",map->name, ctrl->info.entity, ctrl->info.selector);
return 0;
}