release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/media/dvb/dvb-usb/dvb-usb-i2c.c

   1 /* dvb-usb-i2c.c is part of the DVB USB library.
   2  *
   3  * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@desy.de)
   4  * see dvb-usb-init.c for copyright information.
   5  *
   6  * This file contains functions for (de-)initializing an I2C adapter.
   7  */
   8 #include "dvb-usb-common.h"
   9
  10 int dvb_usb_i2c_init(struct dvb_usb_device *d)
  11 {
  12         int ret = 0;
  13
  14         if (!(d->props.caps & DVB_USB_IS_AN_I2C_ADAPTER))
  15                 return 0;
  16
  17         if (d->props.i2c_algo == NULL) {
  18                 err("no i2c algorithm specified");
  19                 return -EINVAL;
  20         }
  21
  22         strlcpy(d->i2c_adap.name, d->desc->name, sizeof(d->i2c_adap.name));
  23         d->i2c_adap.class = I2C_CLASS_TV_DIGITAL,
  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 }