1.17. V4L2 flash functions and data structures

struct v4l2_flash_config

V4L2 Flash sub-device initialization data

Definition

struct v4l2_flash_config {
  char dev_name[32];
  struct led_flash_setting torch_intensity;
  struct led_flash_setting indicator_intensity;
  u32 flash_faults;
  unsigned int has_external_strobe:1;
};

Members

char dev_name[32]

the name of the media entity, unique in the system

struct led_flash_setting torch_intensity

constraints for the LED in torch mode

struct led_flash_setting indicator_intensity

constraints for the indicator LED

u32 flash_faults

bitmask of flash faults that the LED flash class device can report; corresponding LED_FAULT* bit definitions are available in the header file <linux/led-class-flash.h>

unsigned int:1 has_external_strobe

external strobe capability

struct v4l2_flash

Flash sub-device context

Definition

struct v4l2_flash {
  struct led_classdev_flash * fled_cdev;
  struct led_classdev_flash * iled_cdev;
  const struct v4l2_flash_ops * ops;
  struct v4l2_subdev sd;
  struct v4l2_ctrl_handler hdl;
  struct v4l2_ctrl ** ctrls;
};

Members

struct led_classdev_flash * fled_cdev

LED flash class device controlled by this sub-device

struct led_classdev_flash * iled_cdev

LED class device representing indicator LED associated with the LED flash class device

const struct v4l2_flash_ops * ops

V4L2 specific flash ops

struct v4l2_subdev sd

V4L2 sub-device

struct v4l2_ctrl_handler hdl

flash controls handler

struct v4l2_ctrl ** ctrls

array of pointers to controls, whose values define the sub-device state

struct v4l2_flash * v4l2_flash_init(struct device * dev, struct device_node * of_node, struct led_classdev_flash * fled_cdev, struct led_classdev_flash * iled_cdev, const struct v4l2_flash_ops * ops, struct v4l2_flash_config * config)

initialize V4L2 flash led sub-device

Parameters

struct device * dev

flash device, e.g. an I2C device

struct device_node * of_node

of_node of the LED, may be NULL if the same as device’s

struct led_classdev_flash * fled_cdev

LED flash class device to wrap

struct led_classdev_flash * iled_cdev

LED flash class device representing indicator LED associated with fled_cdev, may be NULL

const struct v4l2_flash_ops * ops

V4L2 Flash device ops

struct v4l2_flash_config * config

initialization data for V4L2 Flash sub-device

Description

Create V4L2 Flash sub-device wrapping given LED subsystem device.

Return

A valid pointer, or, when an error occurs, the return value is encoded using ERR_PTR(). Use IS_ERR() to check and PTR_ERR() to obtain the numeric return value.

void v4l2_flash_release(struct v4l2_flash * v4l2_flash)

release V4L2 Flash sub-device

Parameters

struct v4l2_flash * v4l2_flash

the V4L2 Flash sub-device to release

Description

Release V4L2 Flash sub-device.