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