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 		ret = -EINVAL;
21 		goto err;
22 	}
23 
24 	strscpy(d->i2c_adap.name, d->desc->name, sizeof(d->i2c_adap.name));
25 	d->i2c_adap.algo      = d->props.i2c_algo;
26 	d->i2c_adap.algo_data = NULL;
27 	d->i2c_adap.dev.parent = &d->udev->dev;
28 
29 	i2c_set_adapdata(&d->i2c_adap, d);
30 
31 	ret = i2c_add_adapter(&d->i2c_adap);
32 	if (ret < 0) {
33 		err("could not add i2c adapter");
34 		goto err;
35 	}
36 
37 	d->state |= DVB_USB_STATE_I2C;
38 
39 err:
40 	return ret;
41 }
42 
43 int dvb_usb_i2c_exit(struct dvb_usb_device *d)
44 {
45 	if (d->state & DVB_USB_STATE_I2C)
46 		i2c_del_adapter(&d->i2c_adap);
47 	d->state &= ~DVB_USB_STATE_I2C;
48 	return 0;
49 }
50