linux/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_sw.c

/*
 * Copyright 2018 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: AMD
 *
 */

#include "dce_i2c.h"
#include "dce_i2c_sw.h"
#include "include/gpio_service_interface.h"
#define SCL …
#define SDA …

void dce_i2c_sw_construct(
	struct dce_i2c_sw *dce_i2c_sw,
	struct dc_context *ctx)
{ … }

static inline bool read_bit_from_ddc(
	struct ddc *ddc,
	bool data_nor_clock)
{ … }

static inline void write_bit_to_ddc(
	struct ddc *ddc,
	bool data_nor_clock,
	bool bit)
{ … }

static void release_engine_dce_sw(
	struct resource_pool *pool,
	struct dce_i2c_sw *dce_i2c_sw)
{ … }

static bool wait_for_scl_high_sw(
	struct dc_context *ctx,
	struct ddc *ddc,
	uint16_t clock_delay_div_4)
{ … }
static bool write_byte_sw(
	struct dc_context *ctx,
	struct ddc *ddc_handle,
	uint16_t clock_delay_div_4,
	uint8_t byte)
{ … }

static bool read_byte_sw(
	struct dc_context *ctx,
	struct ddc *ddc_handle,
	uint16_t clock_delay_div_4,
	uint8_t *byte,
	bool more)
{ … }
static bool stop_sync_sw(
	struct dc_context *ctx,
	struct ddc *ddc_handle,
	uint16_t clock_delay_div_4)
{ … }
static bool i2c_write_sw(
	struct dc_context *ctx,
	struct ddc *ddc_handle,
	uint16_t clock_delay_div_4,
	uint8_t address,
	uint32_t length,
	const uint8_t *data)
{ … }

static bool i2c_read_sw(
	struct dc_context *ctx,
	struct ddc *ddc_handle,
	uint16_t clock_delay_div_4,
	uint8_t address,
	uint32_t length,
	uint8_t *data)
{ … }



static bool start_sync_sw(
	struct dc_context *ctx,
	struct ddc *ddc_handle,
	uint16_t clock_delay_div_4)
{ … }

static void dce_i2c_sw_engine_set_speed(
	struct dce_i2c_sw *engine,
	uint32_t speed)
{ … }

static bool dce_i2c_sw_engine_acquire_engine(
	struct dce_i2c_sw *engine,
	struct ddc *ddc)
{ … }

bool dce_i2c_engine_acquire_sw(
	struct dce_i2c_sw *dce_i2c_sw,
	struct ddc *ddc_handle)
{ … }

static void dce_i2c_sw_engine_submit_channel_request(struct dce_i2c_sw *engine,
						     struct i2c_request_transaction_data *req)
{ … }

static bool dce_i2c_sw_engine_submit_payload(struct dce_i2c_sw *engine,
					     struct i2c_payload *payload,
					     bool middle_of_transaction)
{ … }
bool dce_i2c_submit_command_sw(
	struct resource_pool *pool,
	struct ddc *ddc,
	struct i2c_command *cmd,
	struct dce_i2c_sw *dce_i2c_sw)
{ … }