linux/drivers/gpu/drm/gma500/intel_i2c.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright © 2006-2007 Intel Corporation
 *
 * Authors:
 *	Eric Anholt <[email protected]>
 */

#include <linux/delay.h>
#include <linux/export.h>
#include <linux/i2c-algo-bit.h>
#include <linux/i2c.h>

#include "psb_drv.h"
#include "psb_intel_reg.h"

/*
 * Intel GPIO access functions
 */

#define I2C_RISEFALL_TIME …

static int get_clock(void *data)
{ … }

static int get_data(void *data)
{ … }

static void set_clock(void *data, int state_high)
{ … }

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

/**
 * gma_i2c_create - instantiate an Intel i2c bus using the specified GPIO reg
 * @dev: DRM device
 * @reg: GPIO reg to use
 * @name: name for this bus
 *
 * Creates and registers a new i2c bus with the Linux i2c layer, for use
 * in output probing and control (e.g. DDC or SDVO control functions).
 *
 * Possible values for @reg include:
 *   %GPIOA
 *   %GPIOB
 *   %GPIOC
 *   %GPIOD
 *   %GPIOE
 *   %GPIOF
 *   %GPIOG
 *   %GPIOH
 * see PRM for details on how these different busses are used.
 */
struct gma_i2c_chan *gma_i2c_create(struct drm_device *dev, const u32 reg,
				    const char *name)
{ … }

/**
 * gma_i2c_destroy - unregister and free i2c bus resources
 * @chan: channel to free
 *
 * Unregister the adapter from the i2c layer, then free the structure.
 */
void gma_i2c_destroy(struct gma_i2c_chan *chan)
{ … }