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+/*
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+ * Copyright (c) 2015 NVIDIA Corporation. All rights reserved.
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a
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+ * copy of this software and associated documentation files (the "Software"),
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+ * to deal in the Software without restriction, including without limitation
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+ * the rights to use, copy, modify, merge, publish, distribute, sub license,
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+ * and/or sell copies of the Software, and to permit persons to whom the
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+ * Software is furnished to do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice (including the
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+ * next paragraph) shall be included in all copies or substantial portions
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+ * of the Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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+ * DEALINGS IN THE SOFTWARE.
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+ */
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+
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+#ifndef DRM_SCDC_HELPER_H
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+#define DRM_SCDC_HELPER_H
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+
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+#include <linux/i2c.h>
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+#include <linux/types.h>
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+
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+#define SCDC_SINK_VERSION 0x01
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+
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+#define SCDC_SOURCE_VERSION 0x02
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+
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+#define SCDC_UPDATE_0 0x10
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+#define SCDC_READ_REQUEST_TEST (1 << 2)
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+#define SCDC_CED_UPDATE (1 << 1)
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+#define SCDC_STATUS_UPDATE (1 << 0)
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+
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+#define SCDC_UPDATE_1 0x11
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+
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+#define SCDC_TMDS_CONFIG 0x20
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+#define SCDC_TMDS_BIT_CLOCK_RATIO_BY_40 (1 << 1)
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+#define SCDC_TMDS_BIT_CLOCK_RATIO_BY_10 (0 << 1)
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+#define SCDC_SCRAMBLING_ENABLE (1 << 0)
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+
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+#define SCDC_SCRAMBLER_STATUS 0x21
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+#define SCDC_SCRAMBLING_STATUS (1 << 0)
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+
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+#define SCDC_CONFIG_0 0x30
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+#define SCDC_READ_REQUEST_ENABLE (1 << 0)
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+
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+#define SCDC_STATUS_FLAGS_0 0x40
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+#define SCDC_CH2_LOCK (1 < 3)
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+#define SCDC_CH1_LOCK (1 < 2)
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+#define SCDC_CH0_LOCK (1 < 1)
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+#define SCDC_CH_LOCK_MASK (SCDC_CH2_LOCK | SCDC_CH1_LOCK | SCDC_CH0_LOCK)
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+#define SCDC_CLOCK_DETECT (1 << 0)
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+
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+#define SCDC_STATUS_FLAGS_1 0x41
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+
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+#define SCDC_ERR_DET_0_L 0x50
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+#define SCDC_ERR_DET_0_H 0x51
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+#define SCDC_ERR_DET_1_L 0x52
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+#define SCDC_ERR_DET_1_H 0x53
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+#define SCDC_ERR_DET_2_L 0x54
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+#define SCDC_ERR_DET_2_H 0x55
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+#define SCDC_CHANNEL_VALID (1 << 7)
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+
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+#define SCDC_ERR_DET_CHECKSUM 0x56
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+
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+#define SCDC_TEST_CONFIG_0 0xc0
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+#define SCDC_TEST_READ_REQUEST (1 << 7)
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+#define SCDC_TEST_READ_REQUEST_DELAY(x) ((x) & 0x7f)
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+
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+#define SCDC_MANUFACTURER_IEEE_OUI 0xd0
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+#define SCDC_MANUFACTURER_IEEE_OUI_SIZE 3
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+
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+#define SCDC_DEVICE_ID 0xd3
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+#define SCDC_DEVICE_ID_SIZE 8
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+
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+#define SCDC_DEVICE_HARDWARE_REVISION 0xdb
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+#define SCDC_GET_DEVICE_HARDWARE_REVISION_MAJOR(x) (((x) >> 4) & 0xf)
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+#define SCDC_GET_DEVICE_HARDWARE_REVISION_MINOR(x) (((x) >> 0) & 0xf)
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+
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+#define SCDC_DEVICE_SOFTWARE_MAJOR_REVISION 0xdc
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+#define SCDC_DEVICE_SOFTWARE_MINOR_REVISION 0xdd
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+
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+#define SCDC_MANUFACTURER_SPECIFIC 0xde
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+#define SCDC_MANUFACTURER_SPECIFIC_SIZE 34
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+
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+ssize_t drm_scdc_read(struct i2c_adapter *adapter, u8 offset, void *buffer,
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+ size_t size);
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+ssize_t drm_scdc_write(struct i2c_adapter *adapter, u8 offset,
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+ const void *buffer, size_t size);
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+
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+/**
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+ * drm_scdc_readb - read a single byte from SCDC
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+ * @adapter: I2C adapter
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+ * @offset: offset of register to read
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+ * @value: return location for the register value
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+ *
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+ * Reads a single byte from SCDC. This is a convenience wrapper around the
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+ * drm_scdc_read() function.
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+ *
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+ * Returns:
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+ * 0 on success or a negative error code on failure.
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+ */
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+static inline int drm_scdc_readb(struct i2c_adapter *adapter, u8 offset,
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+ u8 *value)
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+{
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+ return drm_scdc_read(adapter, offset, value, sizeof(*value));
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+}
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+
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+/**
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+ * drm_scdc_writeb - write a single byte to SCDC
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+ * @adapter: I2C adapter
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+ * @offset: offset of register to read
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+ * @value: return location for the register value
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+ *
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+ * Writes a single byte to SCDC. This is a convenience wrapper around the
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+ * drm_scdc_write() function.
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+ *
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+ * Returns:
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+ * 0 on success or a negative error code on failure.
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+ */
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+static inline int drm_scdc_writeb(struct i2c_adapter *adapter, u8 offset,
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+ u8 value)
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+{
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+ return drm_scdc_write(adapter, offset, &value, sizeof(value));
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+}
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+
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+#endif
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