linux/drivers/gpu/drm/amd/amdgpu/amdgpu_i2c.c

/*
 * Copyright 2007-8 Advanced Micro Devices, Inc.
 * Copyright 2008 Red Hat 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: Dave Airlie
 *          Alex Deucher
 */

#include <linux/export.h>
#include <linux/pci.h>

#include <drm/drm_edid.h>
#include <drm/amdgpu_drm.h>
#include "amdgpu.h"
#include "amdgpu_i2c.h"
#include "amdgpu_atombios.h"
#include "atom.h"
#include "atombios_dp.h"
#include "atombios_i2c.h"

/* bit banging i2c */
static int amdgpu_i2c_pre_xfer(struct i2c_adapter *i2c_adap)
{ … }

static void amdgpu_i2c_post_xfer(struct i2c_adapter *i2c_adap)
{ … }

static int amdgpu_i2c_get_clock(void *i2c_priv)
{ … }


static int amdgpu_i2c_get_data(void *i2c_priv)
{ … }

static void amdgpu_i2c_set_clock(void *i2c_priv, int clock)
{ … }

static void amdgpu_i2c_set_data(void *i2c_priv, int data)
{ … }

static const struct i2c_algorithm amdgpu_atombios_i2c_algo = …;

struct amdgpu_i2c_chan *amdgpu_i2c_create(struct drm_device *dev,
					  const struct amdgpu_i2c_bus_rec *rec,
					  const char *name)
{ … }

void amdgpu_i2c_destroy(struct amdgpu_i2c_chan *i2c)
{ … }

/* Add the default buses */
void amdgpu_i2c_init(struct amdgpu_device *adev)
{ … }

/* remove all the buses */
void amdgpu_i2c_fini(struct amdgpu_device *adev)
{ … }

/* Add additional buses */
void amdgpu_i2c_add(struct amdgpu_device *adev,
		    const struct amdgpu_i2c_bus_rec *rec,
		    const char *name)
{ … }

/* looks up bus based on id */
struct amdgpu_i2c_chan *
amdgpu_i2c_lookup(struct amdgpu_device *adev,
		  const struct amdgpu_i2c_bus_rec *i2c_bus)
{ … }

static int amdgpu_i2c_get_byte(struct amdgpu_i2c_chan *i2c_bus,
				 u8 slave_addr,
				 u8 addr,
				 u8 *val)
{ … }

static int amdgpu_i2c_put_byte(struct amdgpu_i2c_chan *i2c_bus,
				 u8 slave_addr,
				 u8 addr,
				 u8 val)
{ … }

/* ddc router switching */
void
amdgpu_i2c_router_select_ddc_port(const struct amdgpu_connector *amdgpu_connector)
{ … }

/* clock/data router switching */
void
amdgpu_i2c_router_select_cd_port(const struct amdgpu_connector *amdgpu_connector)
{ … }