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 */
156