1 /*
2  * Copyright (c) 2015 NVIDIA Corporation. All rights reserved.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sub license,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the
12  * next paragraph) shall be included in all copies or substantial portions
13  * of the Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21  * DEALINGS IN THE SOFTWARE.
22  */
23 
24 #ifndef DRM_SCDC_HELPER_H
25 #define DRM_SCDC_HELPER_H
26 
27 #include <linux/types.h>
28 
29 #include <drm/display/drm_scdc.h>
30 
31 struct i2c_adapter;
32 
33 ssize_t drm_scdc_read(struct i2c_adapter *adapter, u8 offset, void *buffer,
34 		      size_t size);
35 ssize_t drm_scdc_write(struct i2c_adapter *adapter, u8 offset,
36 		       const void *buffer, size_t size);
37 
38 /**
39  * drm_scdc_readb - read a single byte from SCDC
40  * @adapter: I2C adapter
41  * @offset: offset of register to read
42  * @value: return location for the register value
43  *
44  * Reads a single byte from SCDC. This is a convenience wrapper around the
45  * drm_scdc_read() function.
46  *
47  * Returns:
48  * 0 on success or a negative error code on failure.
49  */
50 static inline int drm_scdc_readb(struct i2c_adapter *adapter, u8 offset,
51 				 u8 *value)
52 {
53 	return drm_scdc_read(adapter, offset, value, sizeof(*value));
54 }
55 
56 /**
57  * drm_scdc_writeb - write a single byte to SCDC
58  * @adapter: I2C adapter
59  * @offset: offset of register to read
60  * @value: return location for the register value
61  *
62  * Writes a single byte to SCDC. This is a convenience wrapper around the
63  * drm_scdc_write() function.
64  *
65  * Returns:
66  * 0 on success or a negative error code on failure.
67  */
68 static inline int drm_scdc_writeb(struct i2c_adapter *adapter, u8 offset,
69 				  u8 value)
70 {
71 	return drm_scdc_write(adapter, offset, &value, sizeof(value));
72 }
73 
74 bool drm_scdc_get_scrambling_status(struct i2c_adapter *adapter);
75 
76 bool drm_scdc_set_scrambling(struct i2c_adapter *adapter, bool enable);
77 bool drm_scdc_set_high_tmds_clock_ratio(struct i2c_adapter *adapter, bool set);
78 
79 #endif
80