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