81 lines · c
1/*2 * Copyright (c) 2015 NVIDIA Corporation. All rights reserved.3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * 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 the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice (including the12 * next paragraph) shall be included in all copies or substantial portions13 * of the Software.14 *15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,17 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER21 * DEALINGS IN THE SOFTWARE.22 */23 24#ifndef DRM_SCDC_HELPER_H25#define DRM_SCDC_HELPER_H26 27#include <linux/types.h>28 29#include <drm/display/drm_scdc.h>30 31struct drm_connector;32struct i2c_adapter;33 34ssize_t drm_scdc_read(struct i2c_adapter *adapter, u8 offset, void *buffer,35 size_t size);36ssize_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 SCDC41 * @adapter: I2C adapter42 * @offset: offset of register to read43 * @value: return location for the register value44 *45 * Reads a single byte from SCDC. This is a convenience wrapper around the46 * drm_scdc_read() function.47 *48 * Returns:49 * 0 on success or a negative error code on failure.50 */51static 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 SCDC59 * @adapter: I2C adapter60 * @offset: offset of register to read61 * @value: return location for the register value62 *63 * Writes a single byte to SCDC. This is a convenience wrapper around the64 * drm_scdc_write() function.65 *66 * Returns:67 * 0 on success or a negative error code on failure.68 */69static 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 75bool drm_scdc_get_scrambling_status(struct drm_connector *connector);76 77bool drm_scdc_set_scrambling(struct drm_connector *connector, bool enable);78bool drm_scdc_set_high_tmds_clock_ratio(struct drm_connector *connector, bool set);79 80#endif81