1 // SPDX-License-Identifier: GPL-2.0
2 /* dvb-usb-i2c.c is part of the DVB USB library.
3  *
4  * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@posteo.de)
5  * see dvb-usb-init.c for copyright information.
6  *
7  * This file contains functions for (de-)initializing an I2C adapter.
8  */
9 #include "dvb-usb-common.h"
10 
11 int dvb_usb_i2c_init(struct dvb_usb_device *d)
12 {
13 	int ret = 0;
14 
15 	if (!(d->props.caps & DVB_USB_IS_AN_I2C_ADAPTER))
16 		return 0;
17 
18 	if (d->props.i2c_algo == NULL) {
19 		err("no i2c algorithm specified");
20 		return -EINVAL;
21 	}
22 
23 	strscpy(d->i2c_adap.name, d->desc->name, sizeof(d->i2c_adap.name));
24 	d->i2c_adap.algo      = d->props.i2c_algo;
25 	d->i2c_adap.algo_data = NULL;
26 	d->i2c_adap.dev.parent = &d->udev->dev;
27 
28 	i2c_set_adapdata(&d->i2c_adap, d);
29 
30 	if ((ret = i2c_add_adapter(&d->i2c_adap)) < 0)
31 		err("could not add i2c adapter");
32 
33 	d->state |= DVB_USB_STATE_I2C;
34 
35 	return ret;
36 }
37 
38 int dvb_usb_i2c_exit(struct dvb_usb_device *d)
39 {
40 	if (d->state & DVB_USB_STATE_I2C)
41 		i2c_del_adapter(&d->i2c_adap);
42 	d->state &= ~DVB_USB_STATE_I2C;
43 	return 0;
44 }
45