42bd6f59ae
This patch adds helper functions for registering/unregistering LED Flash class devices as V4L2 sub-devices. The functions should be called from the LED subsystem device driver. In case the support for V4L2 Flash sub-devices is disabled in the kernel config the functions' empty versions will be used. Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com> Acked-by: Kyungmin Park <kyungmin.park@samsung.com> Cc: Sakari Ailus <sakari.ailus@iki.fi> Cc: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
149 lines
4.6 KiB
C
149 lines
4.6 KiB
C
/*
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* V4L2 flash LED sub-device registration helpers.
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*
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* Copyright (C) 2015 Samsung Electronics Co., Ltd
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* Author: Jacek Anaszewski <j.anaszewski@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _V4L2_FLASH_H
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#define _V4L2_FLASH_H
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-subdev.h>
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struct led_classdev_flash;
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struct led_classdev;
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struct v4l2_flash;
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enum led_brightness;
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/*
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* struct v4l2_flash_ctrl_data - flash control initialization data, filled
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* basing on the features declared by the LED flash
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* class driver in the v4l2_flash_config
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* @config: initialization data for a control
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* @cid: contains v4l2 flash control id if the config
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* field was initialized, 0 otherwise
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*/
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struct v4l2_flash_ctrl_data {
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struct v4l2_ctrl_config config;
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u32 cid;
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};
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struct v4l2_flash_ops {
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/* setup strobing the flash by hardware pin state assertion */
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int (*external_strobe_set)(struct v4l2_flash *v4l2_flash,
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bool enable);
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/* convert intensity to brightness in a device specific manner */
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enum led_brightness (*intensity_to_led_brightness)
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(struct v4l2_flash *v4l2_flash, s32 intensity);
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/* convert brightness to intensity in a device specific manner */
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s32 (*led_brightness_to_intensity)
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(struct v4l2_flash *v4l2_flash, enum led_brightness);
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};
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/**
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* struct v4l2_flash_config - V4L2 Flash sub-device initialization data
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* @dev_name: the name of the media entity,
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unique in the system
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* @torch_intensity: constraints for the LED in torch mode
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* @indicator_intensity: constraints for the indicator LED
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* @flash_faults: bitmask of flash faults that the LED flash class
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device can report; corresponding LED_FAULT* bit
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definitions are available in the header file
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<linux/led-class-flash.h>
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* @has_external_strobe: external strobe capability
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*/
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struct v4l2_flash_config {
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char dev_name[32];
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struct led_flash_setting torch_intensity;
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struct led_flash_setting indicator_intensity;
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u32 flash_faults;
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unsigned int has_external_strobe:1;
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};
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/**
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* struct v4l2_flash - Flash sub-device context
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* @fled_cdev: LED flash class device controlled by this sub-device
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* @iled_cdev: LED class device representing indicator LED associated
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* with the LED flash class device
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* @ops: V4L2 specific flash ops
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* @sd: V4L2 sub-device
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* @hdl: flash controls handler
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* @ctrls: array of pointers to controls, whose values define
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* the sub-device state
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*/
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struct v4l2_flash {
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struct led_classdev_flash *fled_cdev;
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struct led_classdev_flash *iled_cdev;
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const struct v4l2_flash_ops *ops;
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struct v4l2_subdev sd;
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struct v4l2_ctrl_handler hdl;
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struct v4l2_ctrl **ctrls;
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};
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static inline struct v4l2_flash *v4l2_subdev_to_v4l2_flash(
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struct v4l2_subdev *sd)
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{
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return container_of(sd, struct v4l2_flash, sd);
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}
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static inline struct v4l2_flash *v4l2_ctrl_to_v4l2_flash(struct v4l2_ctrl *c)
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{
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return container_of(c->handler, struct v4l2_flash, hdl);
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}
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#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
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/**
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* v4l2_flash_init - initialize V4L2 flash led sub-device
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* @dev: flash device, e.g. an I2C device
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* @of_node: of_node of the LED, may be NULL if the same as device's
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* @fled_cdev: LED flash class device to wrap
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* @iled_cdev: LED flash class device representing indicator LED associated
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* with fled_cdev, may be NULL
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* @flash_ops: V4L2 Flash device ops
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* @config: initialization data for V4L2 Flash sub-device
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*
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* Create V4L2 Flash sub-device wrapping given LED subsystem device.
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*
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* Returns: A valid pointer, or, when an error occurs, the return
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* value is encoded using ERR_PTR(). Use IS_ERR() to check and
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* PTR_ERR() to obtain the numeric return value.
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*/
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struct v4l2_flash *v4l2_flash_init(
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struct device *dev, struct device_node *of_node,
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struct led_classdev_flash *fled_cdev,
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struct led_classdev_flash *iled_cdev,
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const struct v4l2_flash_ops *ops,
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struct v4l2_flash_config *config);
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/**
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* v4l2_flash_release - release V4L2 Flash sub-device
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* @flash: the V4L2 Flash sub-device to release
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*
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* Release V4L2 Flash sub-device.
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*/
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void v4l2_flash_release(struct v4l2_flash *v4l2_flash);
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#else
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static inline struct v4l2_flash *v4l2_flash_init(
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struct device *dev, struct device_node *of_node,
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struct led_classdev_flash *fled_cdev,
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struct led_classdev_flash *iled_cdev,
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const struct v4l2_flash_ops *ops,
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struct v4l2_flash_config *config)
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{
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return NULL;
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}
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static inline void v4l2_flash_release(struct v4l2_flash *v4l2_flash)
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{
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}
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#endif /* CONFIG_V4L2_FLASH_LED_CLASS */
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#endif /* _V4L2_FLASH_H */
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