include/media/v4l2-flash-led-class.h

   1 /*
   2  * V4L2 flash LED sub-device registration helpers.
   3  *
   4  *      Copyright (C) 2015 Samsung Electronics Co., Ltd
   5  *      Author: Jacek Anaszewski <j.anaszewski@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #ifndef _V4L2_FLASH_H
  13 #define _V4L2_FLASH_H
  14
  15 #include <media/v4l2-ctrls.h>
  16 #include <media/v4l2-subdev.h>
  17
  18 struct led_classdev_flash;
  19 struct led_classdev;
  20 struct v4l2_flash;
  21 enum led_brightness;
  22
  23 /**
  24  * struct v4l2_flash_ctrl_data - flash control initialization data, filled
  25  *                              basing on the features declared by the LED flash
  26  *                              class driver in the v4l2_flash_config
  27  * @config:     initialization data for a control
  28  * @cid:        contains v4l2 flash control id if the config
  29  *              field was initialized, 0 otherwise
  30  */
  31 struct v4l2_flash_ctrl_data {
  32         struct v4l2_ctrl_config config;
  33         u32 cid;
  34 };
  35
  36 /**
  37  * struct v4l2_flash_ops - V4L2 flash operations
  38  *
  39  * @external_strobe_set: Setup strobing the flash by hardware pin state
  40  *      assertion.
  41  * @intensity_to_led_brightness: Convert intensity to brightness in a device
  42  *      specific manner
  43  * @led_brightness_to_intensity: convert brightness to intensity in a device
  44  *      specific manner.
  45  */
  46 struct v4l2_flash_ops {
  47         int (*external_strobe_set)(struct v4l2_flash *v4l2_flash,
  48                                         bool enable);
  49         enum led_brightness (*intensity_to_led_brightness)
  50                 (struct v4l2_flash *v4l2_flash, s32 intensity);
  51         s32 (*led_brightness_to_intensity)
  52                 (struct v4l2_flash *v4l2_flash, enum led_brightness);
  53 };
  54
  55 /**
  56  * struct v4l2_flash_config - V4L2 Flash sub-device initialization data
  57  * @dev_name:                   the name of the media entity,
  58  *                              unique in the system
  59  * @torch_intensity:            constraints for the LED in torch mode
  60  * @indicator_intensity:        constraints for the indicator LED
  61  * @flash_faults:               bitmask of flash faults that the LED flash class
  62  *                              device can report; corresponding LED_FAULT* bit
  63  *                              definitions are available in the header file
  64  *                              <linux/led-class-flash.h>
  65  * @has_external_strobe:        external strobe capability
  66  */
  67 struct v4l2_flash_config {
  68         char dev_name[32];
  69         struct led_flash_setting torch_intensity;
  70         struct led_flash_setting indicator_intensity;
  71         u32 flash_faults;
  72         unsigned int has_external_strobe:1;
  73 };
  74
  75 /**
  76  * struct v4l2_flash - Flash sub-device context
  77  * @fled_cdev:          LED flash class device controlled by this sub-device
  78  * @iled_cdev:          LED class device representing indicator LED associated
  79  *                      with the LED flash class device
  80  * @ops:                V4L2 specific flash ops
  81  * @sd:                 V4L2 sub-device
  82  * @hdl:                flash controls handler
  83  * @ctrls:              array of pointers to controls, whose values define
  84  *                      the sub-device state
  85  */
  86 struct v4l2_flash {
  87         struct led_classdev_flash *fled_cdev;
  88         struct led_classdev_flash *iled_cdev;
  89         const struct v4l2_flash_ops *ops;
  90
  91         struct v4l2_subdev sd;
  92         struct v4l2_ctrl_handler hdl;
  93         struct v4l2_ctrl **ctrls;
  94 };
  95
  96 static inline struct v4l2_flash *v4l2_subdev_to_v4l2_flash(
  97                                                         struct v4l2_subdev *sd)
  98 {
  99         return container_of(sd, struct v4l2_flash, sd);
 100 }
 101
 102 static inline struct v4l2_flash *v4l2_ctrl_to_v4l2_flash(struct v4l2_ctrl *c)
 103 {
 104         return container_of(c->handler, struct v4l2_flash, hdl);
 105 }
 106
 107 #if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
 108 /**
 109  * v4l2_flash_init - initialize V4L2 flash led sub-device
 110  * @dev:        flash device, e.g. an I2C device
 111  * @of_node:    of_node of the LED, may be NULL if the same as device's
 112  * @fled_cdev:  LED flash class device to wrap
 113  * @iled_cdev:  LED flash class device representing indicator LED associated
 114  *              with fled_cdev, may be NULL
 115  * @ops:        V4L2 Flash device ops
 116  * @config:     initialization data for V4L2 Flash sub-device
 117  *
 118  * Create V4L2 Flash sub-device wrapping given LED subsystem device.
 119  *
 120  * Returns: A valid pointer, or, when an error occurs, the return
 121  * value is encoded using ERR_PTR(). Use IS_ERR() to check and
 122  * PTR_ERR() to obtain the numeric return value.
 123  */
 124 struct v4l2_flash *v4l2_flash_init(
 125         struct device *dev, struct device_node *of_node,
 126         struct led_classdev_flash *fled_cdev,
 127         struct led_classdev_flash *iled_cdev,
 128         const struct v4l2_flash_ops *ops,
 129         struct v4l2_flash_config *config);
 130
 131 /**
 132  * v4l2_flash_release - release V4L2 Flash sub-device
 133  * @v4l2_flash: the V4L2 Flash sub-device to release
 134  *
 135  * Release V4L2 Flash sub-device.
 136  */
 137 void v4l2_flash_release(struct v4l2_flash *v4l2_flash);
 138
 139 #else
 140 static inline struct v4l2_flash *v4l2_flash_init(
 141         struct device *dev, struct device_node *of_node,
 142         struct led_classdev_flash *fled_cdev,
 143         struct led_classdev_flash *iled_cdev,
 144         const struct v4l2_flash_ops *ops,
 145         struct v4l2_flash_config *config)
 146 {
 147         return NULL;
 148 }
 149
 150 static inline void v4l2_flash_release(struct v4l2_flash *v4l2_flash)
 151 {
 152 }
 153 #endif /* CONFIG_V4L2_FLASH_LED_CLASS */
 154
 155 #endif /* _V4L2_FLASH_H */