linux/drivers/gpu/drm/radeon/radeon_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_device.h>
#include <drm/drm_edid.h>
#include <drm/radeon_drm.h>

#include "radeon.h"
#include "atom.h"

bool radeon_ddc_probe(struct radeon_connector *radeon_connector, bool use_aux)
{ … }

/* bit banging i2c */

static int pre_xfer(struct i2c_adapter *i2c_adap)
{ … }

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

static int get_clock(void *i2c_priv)
{ … }


static int get_data(void *i2c_priv)
{ … }

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

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

/* hw i2c */

static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
{ … }


/* hw i2c engine for r1xx-4xx hardware
 * hw can buffer up to 15 bytes
 */
static int r100_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
			    struct i2c_msg *msgs, int num)
{ … }

/* hw i2c engine for r5xx hardware
 * hw can buffer up to 15 bytes
 */
static int r500_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
			    struct i2c_msg *msgs, int num)
{ … }

static int radeon_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
			      struct i2c_msg *msgs, int num)
{ … }

static u32 radeon_hw_i2c_func(struct i2c_adapter *adap)
{ … }

static const struct i2c_algorithm radeon_i2c_algo = …;

static const struct i2c_algorithm radeon_atom_i2c_algo = …;

struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
					  struct radeon_i2c_bus_rec *rec,
					  const char *name)
{ … }

void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
{ … }

/* Add the default buses */
void radeon_i2c_init(struct radeon_device *rdev)
{ … }

/* remove all the buses */
void radeon_i2c_fini(struct radeon_device *rdev)
{ … }

/* Add additional buses */
void radeon_i2c_add(struct radeon_device *rdev,
		    struct radeon_i2c_bus_rec *rec,
		    const char *name)
{ … }

/* looks up bus based on id */
struct radeon_i2c_chan *radeon_i2c_lookup(struct radeon_device *rdev,
					  struct radeon_i2c_bus_rec *i2c_bus)
{ … }

void radeon_i2c_get_byte(struct radeon_i2c_chan *i2c_bus,
			 u8 slave_addr,
			 u8 addr,
			 u8 *val)
{ … }

void radeon_i2c_put_byte(struct radeon_i2c_chan *i2c_bus,
			 u8 slave_addr,
			 u8 addr,
			 u8 val)
{ … }

/* ddc router switching */
void radeon_router_select_ddc_port(struct radeon_connector *radeon_connector)
{ … }

/* clock/data router switching */
void radeon_router_select_cd_port(struct radeon_connector *radeon_connector)
{ … }