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 drm_connector;
32 struct i2c_adapter;
33
34 ssize_t drm_scdc_read(struct i2c_adapter *adapter, u8 offset, void *buffer,
35 size_t size);
36 ssize_t drm_scdc_write(struct i2c_adapter *adapter, u8 offset,
37 const void *buffer, size_t size);
38
39 /**
40 * drm_scdc_readb - read a single byte from SCDC
41 * @adapter: I2C adapter
42 * @offset: offset of register to read
43 * @value: return location for the register value
44 *
45 * Reads a single byte from SCDC. This is a convenience wrapper around the
46 * drm_scdc_read() function.
47 *
48 * Returns:
49 * 0 on success or a negative error code on failure.
50 */
51 static inline int drm_scdc_readb(struct i2c_adapter *adapter, u8 offset,
52 u8 *value)
53 {
54 return drm_scdc_read(adapter, offset, value, sizeof(*value));
55 }
56
57 /**
58 * drm_scdc_writeb - write a single byte to SCDC
59 * @adapter: I2C adapter
60 * @offset: offset of register to read
61 * @value: return location for the register value
62 *
63 * Writes a single byte to SCDC. This is a convenience wrapper around the
64 * drm_scdc_write() function.
65 *
66 * Returns:
67 * 0 on success or a negative error code on failure.
68 */
69 static inline int drm_scdc_writeb(struct i2c_adapter *adapter, u8 offset,
70 u8 value)
71 {
72 return drm_scdc_write(adapter, offset, &value, sizeof(value));
73 }
74
75 bool drm_scdc_get_scrambling_status(struct drm_connector *connector);
76
77 bool drm_scdc_set_scrambling(struct drm_connector *connector, bool enable);
78 bool drm_scdc_set_high_tmds_clock_ratio(struct drm_connector *connector, bool set);
79
80 #endif
81
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