dvb-usb-i2c.c

来自「trident tm5600的linux驱动」· C语言 代码 · 共 45 行

/* dvb-usb-i2c.c is part of the DVB USB library.
 *
 * Copyright (C) 2004-6 Patrick Boettcher ([e-mail])
 * see dvb-usb-init.c for copyright information.
 *
 * This file contains functions for (de-)initializing an I2C adapter.
 */
#include "dvb-usb-common.h"

int dvb_usb_i2c_init(struct dvb_usb_device *d)
{
	int ret = 0;

	if (!(d->props.caps & DVB_USB_IS_AN_I2C_ADAPTER))
		return 0;

	if (d->props.i2c_algo == NULL) {
		err("no i2c algorithm specified");
		return -EINVAL;
	}

	strncpy(d->i2c_adap.name, d->desc->name, sizeof(d->i2c_adap.name));
	d->i2c_adap.class = I2C_CLASS_TV_DIGITAL,
	d->i2c_adap.algo      = d->props.i2c_algo;
	d->i2c_adap.algo_data = NULL;
	d->i2c_adap.dev.parent = &d->udev->dev;

	i2c_set_adapdata(&d->i2c_adap, d);

	if ((ret = i2c_add_adapter(&d->i2c_adap)) < 0)
		err("could not add i2c adapter");

	d->state |= DVB_USB_STATE_I2C;

	return ret;
}

int dvb_usb_i2c_exit(struct dvb_usb_device *d)
{
	if (d->state & DVB_USB_STATE_I2C)
		i2c_del_adapter(&d->i2c_adap);
	d->state &= ~DVB_USB_STATE_I2C;
	return 0;
}