Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/* radio-cadet.c - A video4linux driver for the ADS Cadet AM/FM Radio Card
 *
 * by Fred Gleason <fredg@wava.com>
 * Version 0.3.3
 *
 * (Loosely) based on code for the Aztech radio card by
 *
 * Russell Kroll    (rkroll@exploits.org)
 * Quay Ly
 * Donald Song
 * Jason Lewis      (jlewis@twilight.vtc.vsc.edu)
 * Scott McGrath    (smcgrath@twilight.vtc.vsc.edu)
 * William McGrath  (wmcgrath@twilight.vtc.vsc.edu)
 *
 * History:
 * 2000-04-29	Russell Kroll <rkroll@exploits.org>
 *		Added ISAPnP detection for Linux 2.3/2.4
 *
 * 2001-01-10	Russell Kroll <rkroll@exploits.org>
 *		Removed dead CONFIG_RADIO_CADET_PORT code
 *		PnP detection on load is now default (no args necessary)
 *
 * 2002-01-17	Adam Belay <ambx1@neo.rr.com>
 *		Updated to latest pnp code
 *
 * 2003-01-31	Alan Cox <alan@lxorguk.ukuu.org.uk>
 *		Cleaned up locking, delay code, general odds and ends
 *
 * 2006-07-30	Hans J. Koch <koch@hjk-az.de>
 *		Changed API to V4L2
 */
 
#include <linux/module.h>	/* Modules			*/
#include <linux/init.h>		/* Initdata			*/
#include <linux/ioport.h>	/* request_region		*/
#include <linux/delay.h>	/* udelay			*/
#include <linux/videodev2.h>	/* V4L2 API defs		*/
#include <linux/param.h>
#include <linux/pnp.h>
#include <linux/sched.h>
#include <linux/io.h>		/* outb, outb_p			*/
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-event.h>
 
MODULE_AUTHOR("Fred Gleason, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
MODULE_DESCRIPTION("A driver for the ADS Cadet AM/FM/RDS radio card.");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.3.4");
 
static int io = -1;		/* default to isapnp activation */
static int radio_nr = -1;
 
module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of Cadet card (0x330,0x332,0x334,0x336,0x338,0x33a,0x33c,0x33e)");
module_param(radio_nr, int, 0);
 
#define RDS_BUFFER 256
#define RDS_RX_FLAG 1
#define MBS_RX_FLAG 2
 
struct cadet {
<------>struct v4l2_device v4l2_dev;
<------>struct video_device vdev;
<------>struct v4l2_ctrl_handler ctrl_handler;
<------>int io;
<------>bool is_fm_band;
<------>u32 curfreq;
<------>int tunestat;
<------>int sigstrength;
<------>wait_queue_head_t read_queue;
<------>struct timer_list readtimer;
<------>u8 rdsin, rdsout, rdsstat;
<------>unsigned char rdsbuf[RDS_BUFFER];
<------>struct mutex lock;
<------>int reading;
};
 
static struct cadet cadet_card;
 
/*
 * Signal Strength Threshold Values
 * The V4L API spec does not define any particular unit for the signal
 * strength value.  These values are in microvolts of RF at the tuner's input.
 */
static u16 sigtable[2][4] = {
<------>{ 1835, 2621,  4128, 65535 },
<------>{ 2185, 4369, 13107, 65535 },
};
 
static const struct v4l2_frequency_band bands[] = {
<------>{
<------><------>.index = 0,
<------><------>.type = V4L2_TUNER_RADIO,
<------><------>.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS,
<------><------>.rangelow = 8320,      /* 520 kHz */
<------><------>.rangehigh = 26400,    /* 1650 kHz */
<------><------>.modulation = V4L2_BAND_MODULATION_AM,
<------>}, {
<------><------>.index = 1,
<------><------>.type = V4L2_TUNER_RADIO,
<------><------>.capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
<------><------><------>V4L2_TUNER_CAP_RDS_BLOCK_IO | V4L2_TUNER_CAP_LOW |
<------><------><------>V4L2_TUNER_CAP_FREQ_BANDS,
<------><------>.rangelow = 1400000,   /* 87.5 MHz */
<------><------>.rangehigh = 1728000,  /* 108.0 MHz */
<------><------>.modulation = V4L2_BAND_MODULATION_FM,
<------>},
};
 
 
static int cadet_getstereo(struct cadet *dev)
{
<------>int ret = V4L2_TUNER_SUB_MONO;
 
<------>if (!dev->is_fm_band)	/* Only FM has stereo capability! */
<------><------>return V4L2_TUNER_SUB_MONO;
 
<------>outb(7, dev->io);          /* Select tuner control */
<------>if ((inb(dev->io + 1) & 0x40) == 0)
<------><------>ret = V4L2_TUNER_SUB_STEREO;
<------>return ret;
}
 
static unsigned cadet_gettune(struct cadet *dev)
{
<------>int curvol, i;
<------>unsigned fifo = 0;
 
<------>/*
<------> * Prepare for read
<------> */
 
<------>outb(7, dev->io);       /* Select tuner control */
<------>curvol = inb(dev->io + 1); /* Save current volume/mute setting */
<------>outb(0x00, dev->io + 1);  /* Ensure WRITE-ENABLE is LOW */
<------>dev->tunestat = 0xffff;
 
<------>/*
<------> * Read the shift register
<------> */
<------>for (i = 0; i < 25; i++) {
<------><------>fifo = (fifo << 1) | ((inb(dev->io + 1) >> 7) & 0x01);
<------><------>if (i < 24) {
<------><------><------>outb(0x01, dev->io + 1);
<------><------><------>dev->tunestat &= inb(dev->io + 1);
<------><------><------>outb(0x00, dev->io + 1);
<------><------>}
<------>}
 
<------>/*
<------> * Restore volume/mute setting
<------> */
<------>outb(curvol, dev->io + 1);
<------>return fifo;
}
 
static unsigned cadet_getfreq(struct cadet *dev)
{
<------>int i;
<------>unsigned freq = 0, test, fifo = 0;
 
<------>/*
<------> * Read current tuning
<------> */
<------>fifo = cadet_gettune(dev);
 
<------>/*
<------> * Convert to actual frequency
<------> */
<------>if (!dev->is_fm_band)    /* AM */
<------><------>return ((fifo & 0x7fff) - 450) * 16;
 
<------>test = 12500;
<------>for (i = 0; i < 14; i++) {
<------><------>if ((fifo & 0x01) != 0)
<------><------><------>freq += test;
<------><------>test = test << 1;
<------><------>fifo = fifo >> 1;
<------>}
<------>freq -= 10700000;           /* IF frequency is 10.7 MHz */
<------>freq = (freq * 16) / 1000;   /* Make it 1/16 kHz */
<------>return freq;
}
 
static void cadet_settune(struct cadet *dev, unsigned fifo)
{
<------>int i;
<------>unsigned test;
 
<------>outb(7, dev->io);                /* Select tuner control */
<------>/*
<------> * Write the shift register
<------> */
<------>test = 0;
<------>test = (fifo >> 23) & 0x02;      /* Align data for SDO */
<------>test |= 0x1c;                /* SDM=1, SWE=1, SEN=1, SCK=0 */
<------>outb(7, dev->io);                /* Select tuner control */
<------>outb(test, dev->io + 1);           /* Initialize for write */
<------>for (i = 0; i < 25; i++) {
<------><------>test |= 0x01;              /* Toggle SCK High */
<------><------>outb(test, dev->io + 1);
<------><------>test &= 0xfe;              /* Toggle SCK Low */
<------><------>outb(test, dev->io + 1);
<------><------>fifo = fifo << 1;            /* Prepare the next bit */
<------><------>test = 0x1c | ((fifo >> 23) & 0x02);
<------><------>outb(test, dev->io + 1);
<------>}
}
 
static void cadet_setfreq(struct cadet *dev, unsigned freq)
{
<------>unsigned fifo;
<------>int i, j, test;
<------>int curvol;
 
<------>freq = clamp(freq, bands[dev->is_fm_band].rangelow,
<------><------><------>   bands[dev->is_fm_band].rangehigh);
<------>dev->curfreq = freq;
<------>/*
<------> * Formulate a fifo command
<------> */
<------>fifo = 0;
<------>if (dev->is_fm_band) {    /* FM */
<------><------>test = 102400;
<------><------>freq = freq / 16;       /* Make it kHz */
<------><------>freq += 10700;               /* IF is 10700 kHz */
<------><------>for (i = 0; i < 14; i++) {
<------><------><------>fifo = fifo << 1;
<------><------><------>if (freq >= test) {
<------><------><------><------>fifo |= 0x01;
<------><------><------><------>freq -= test;
<------><------><------>}
<------><------><------>test = test >> 1;
<------><------>}
<------>} else {	/* AM */
<------><------>fifo = (freq / 16) + 450;	/* Make it kHz */
<------><------>fifo |= 0x100000;		/* Select AM Band */
<------>}
 
<------>/*
<------> * Save current volume/mute setting
<------> */
 
<------>outb(7, dev->io);                /* Select tuner control */
<------>curvol = inb(dev->io + 1);
 
<------>/*
<------> * Tune the card
<------> */
<------>for (j = 3; j > -1; j--) {
<------><------>cadet_settune(dev, fifo | (j << 16));
 
<------><------>outb(7, dev->io);         /* Select tuner control */
<------><------>outb(curvol, dev->io + 1);
 
<------><------>msleep(100);
 
<------><------>cadet_gettune(dev);
<------><------>if ((dev->tunestat & 0x40) == 0) {   /* Tuned */
<------><------><------>dev->sigstrength = sigtable[dev->is_fm_band][j];
<------><------><------>goto reset_rds;
<------><------>}
<------>}
<------>dev->sigstrength = 0;
reset_rds:
<------>outb(3, dev->io);
<------>outb(inb(dev->io + 1) & 0x7f, dev->io + 1);
}
 
static bool cadet_has_rds_data(struct cadet *dev)
{
<------>bool result;
 
<------>mutex_lock(&dev->lock);
<------>result = dev->rdsin != dev->rdsout;
<------>mutex_unlock(&dev->lock);
<------>return result;
}
 
 
static void cadet_handler(struct timer_list *t)
{
<------>struct cadet *dev = from_timer(dev, t, readtimer);
 
<------>/* Service the RDS fifo */
<------>if (mutex_trylock(&dev->lock)) {
<------><------>outb(0x3, dev->io);       /* Select RDS Decoder Control */
<------><------>if ((inb(dev->io + 1) & 0x20) != 0)
<------><------><------>pr_err("cadet: RDS fifo overflow\n");
<------><------>outb(0x80, dev->io);      /* Select RDS fifo */
 
<------><------>while ((inb(dev->io) & 0x80) != 0) {
<------><------><------>dev->rdsbuf[dev->rdsin] = inb(dev->io + 1);
<------><------><------>if (dev->rdsin + 1 != dev->rdsout)
<------><------><------><------>dev->rdsin++;
<------><------>}
<------><------>mutex_unlock(&dev->lock);
<------>}
 
<------>/*
<------> * Service pending read
<------> */
<------>if (cadet_has_rds_data(dev))
<------><------>wake_up_interruptible(&dev->read_queue);
 
<------>/*
<------> * Clean up and exit
<------> */
<------>dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
<------>add_timer(&dev->readtimer);
}
 
static void cadet_start_rds(struct cadet *dev)
{
<------>dev->rdsstat = 1;
<------>outb(0x80, dev->io);        /* Select RDS fifo */
<------>timer_setup(&dev->readtimer, cadet_handler, 0);
<------>dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
<------>add_timer(&dev->readtimer);
}
 
static ssize_t cadet_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
{
<------>struct cadet *dev = video_drvdata(file);
<------>unsigned char readbuf[RDS_BUFFER];
<------>int i = 0;
 
<------>mutex_lock(&dev->lock);
<------>if (dev->rdsstat == 0)
<------><------>cadet_start_rds(dev);
<------>mutex_unlock(&dev->lock);
 
<------>if (!cadet_has_rds_data(dev) && (file->f_flags & O_NONBLOCK))
<------><------>return -EWOULDBLOCK;
<------>i = wait_event_interruptible(dev->read_queue, cadet_has_rds_data(dev));
<------>if (i)
<------><------>return i;
 
<------>mutex_lock(&dev->lock);
<------>while (i < count && dev->rdsin != dev->rdsout)
<------><------>readbuf[i++] = dev->rdsbuf[dev->rdsout++];
<------>mutex_unlock(&dev->lock);
 
<------>if (i && copy_to_user(data, readbuf, i))
<------><------>return -EFAULT;
<------>return i;
}
 
 
static int vidioc_querycap(struct file *file, void *priv,
<------><------><------><------>struct v4l2_capability *v)
{
<------>strscpy(v->driver, "ADS Cadet", sizeof(v->driver));
<------>strscpy(v->card, "ADS Cadet", sizeof(v->card));
<------>strscpy(v->bus_info, "ISA:radio-cadet", sizeof(v->bus_info));
<------>return 0;
}
 
static int vidioc_g_tuner(struct file *file, void *priv,
<------><------><------><------>struct v4l2_tuner *v)
{
<------>struct cadet *dev = video_drvdata(file);
 
<------>if (v->index)
<------><------>return -EINVAL;
<------>v->type = V4L2_TUNER_RADIO;
<------>strscpy(v->name, "Radio", sizeof(v->name));
<------>v->capability = bands[0].capability | bands[1].capability;
<------>v->rangelow = bands[0].rangelow;	   /* 520 kHz (start of AM band) */
<------>v->rangehigh = bands[1].rangehigh;    /* 108.0 MHz (end of FM band) */
<------>if (dev->is_fm_band) {
<------><------>v->rxsubchans = cadet_getstereo(dev);
<------><------>outb(3, dev->io);
<------><------>outb(inb(dev->io + 1) & 0x7f, dev->io + 1);
<------><------>mdelay(100);
<------><------>outb(3, dev->io);
<------><------>if (inb(dev->io + 1) & 0x80)
<------><------><------>v->rxsubchans |= V4L2_TUNER_SUB_RDS;
<------>} else {
<------><------>v->rangelow = 8320;      /* 520 kHz */
<------><------>v->rangehigh = 26400;    /* 1650 kHz */
<------><------>v->rxsubchans = V4L2_TUNER_SUB_MONO;
<------>}
<------>v->audmode = V4L2_TUNER_MODE_STEREO;
<------>v->signal = dev->sigstrength; /* We might need to modify scaling of this */
<------>return 0;
}
 
static int vidioc_s_tuner(struct file *file, void *priv,
<------><------><------><------>const struct v4l2_tuner *v)
{
<------>return v->index ? -EINVAL : 0;
}
 
static int vidioc_enum_freq_bands(struct file *file, void *priv,
<------><------><------><------>struct v4l2_frequency_band *band)
{
<------>if (band->tuner)
<------><------>return -EINVAL;
<------>if (band->index >= ARRAY_SIZE(bands))
<------><------>return -EINVAL;
<------>*band = bands[band->index];
<------>return 0;
}
 
static int vidioc_g_frequency(struct file *file, void *priv,
<------><------><------><------>struct v4l2_frequency *f)
{
<------>struct cadet *dev = video_drvdata(file);
 
<------>if (f->tuner)
<------><------>return -EINVAL;
<------>f->type = V4L2_TUNER_RADIO;
<------>f->frequency = dev->curfreq;
<------>return 0;
}
 
 
static int vidioc_s_frequency(struct file *file, void *priv,
<------><------><------><------>const struct v4l2_frequency *f)
{
<------>struct cadet *dev = video_drvdata(file);
 
<------>if (f->tuner)
<------><------>return -EINVAL;
<------>dev->is_fm_band =
<------><------>f->frequency >= (bands[0].rangehigh + bands[1].rangelow) / 2;
<------>cadet_setfreq(dev, f->frequency);
<------>return 0;
}
 
static int cadet_s_ctrl(struct v4l2_ctrl *ctrl)
{
<------>struct cadet *dev = container_of(ctrl->handler, struct cadet, ctrl_handler);
 
<------>switch (ctrl->id) {
<------>case V4L2_CID_AUDIO_MUTE:
<------><------>outb(7, dev->io);                /* Select tuner control */
<------><------>if (ctrl->val)
<------><------><------>outb(0x00, dev->io + 1);
<------><------>else
<------><------><------>outb(0x20, dev->io + 1);
<------><------>return 0;
<------>}
<------>return -EINVAL;
}
 
static int cadet_open(struct file *file)
{
<------>struct cadet *dev = video_drvdata(file);
<------>int err;
 
<------>mutex_lock(&dev->lock);
<------>err = v4l2_fh_open(file);
<------>if (err)
<------><------>goto fail;
<------>if (v4l2_fh_is_singular_file(file))
<------><------>init_waitqueue_head(&dev->read_queue);
fail:
<------>mutex_unlock(&dev->lock);
<------>return err;
}
 
static int cadet_release(struct file *file)
{
<------>struct cadet *dev = video_drvdata(file);
 
<------>mutex_lock(&dev->lock);
<------>if (v4l2_fh_is_singular_file(file) && dev->rdsstat) {
<------><------>del_timer_sync(&dev->readtimer);
<------><------>dev->rdsstat = 0;
<------>}
<------>v4l2_fh_release(file);
<------>mutex_unlock(&dev->lock);
<------>return 0;
}
 
static __poll_t cadet_poll(struct file *file, struct poll_table_struct *wait)
{
<------>struct cadet *dev = video_drvdata(file);
<------>__poll_t req_events = poll_requested_events(wait);
<------>__poll_t res = v4l2_ctrl_poll(file, wait);
 
<------>poll_wait(file, &dev->read_queue, wait);
<------>if (dev->rdsstat == 0 && (req_events & (EPOLLIN | EPOLLRDNORM))) {
<------><------>mutex_lock(&dev->lock);
<------><------>if (dev->rdsstat == 0)
<------><------><------>cadet_start_rds(dev);
<------><------>mutex_unlock(&dev->lock);
<------>}
<------>if (cadet_has_rds_data(dev))
<------><------>res |= EPOLLIN | EPOLLRDNORM;
<------>return res;
}
 
 
static const struct v4l2_file_operations cadet_fops = {
<------>.owner		= THIS_MODULE,
<------>.open		= cadet_open,
<------>.release	= cadet_release,
<------>.read		= cadet_read,
<------>.unlocked_ioctl	= video_ioctl2,
<------>.poll		= cadet_poll,
};
 
static const struct v4l2_ioctl_ops cadet_ioctl_ops = {
<------>.vidioc_querycap    = vidioc_querycap,
<------>.vidioc_g_tuner     = vidioc_g_tuner,
<------>.vidioc_s_tuner     = vidioc_s_tuner,
<------>.vidioc_g_frequency = vidioc_g_frequency,
<------>.vidioc_s_frequency = vidioc_s_frequency,
<------>.vidioc_enum_freq_bands = vidioc_enum_freq_bands,
<------>.vidioc_log_status  = v4l2_ctrl_log_status,
<------>.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
<------>.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};
 
static const struct v4l2_ctrl_ops cadet_ctrl_ops = {
<------>.s_ctrl = cadet_s_ctrl,
};
 
#ifdef CONFIG_PNP
 
static const struct pnp_device_id cadet_pnp_devices[] = {
<------>/* ADS Cadet AM/FM Radio Card */
<------>{.id = "MSM0c24", .driver_data = 0},
<------>{.id = ""}
};
 
MODULE_DEVICE_TABLE(pnp, cadet_pnp_devices);
 
static int cadet_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
{
<------>if (!dev)
<------><------>return -ENODEV;
<------>/* only support one device */
<------>if (io > 0)
<------><------>return -EBUSY;
 
<------>if (!pnp_port_valid(dev, 0))
<------><------>return -ENODEV;
 
<------>io = pnp_port_start(dev, 0);
 
<------>printk(KERN_INFO "radio-cadet: PnP reports device at %#x\n", io);
 
<------>return io;
}
 
static struct pnp_driver cadet_pnp_driver = {
<------>.name		= "radio-cadet",
<------>.id_table	= cadet_pnp_devices,
<------>.probe		= cadet_pnp_probe,
<------>.remove		= NULL,
};
 
#else
static struct pnp_driver cadet_pnp_driver;
#endif
 
static void cadet_probe(struct cadet *dev)
{
<------>static int iovals[8] = { 0x330, 0x332, 0x334, 0x336, 0x338, 0x33a, 0x33c, 0x33e };
<------>int i;
 
<------>for (i = 0; i < 8; i++) {
<------><------>dev->io = iovals[i];
<------><------>if (request_region(dev->io, 2, "cadet-probe")) {
<------><------><------>cadet_setfreq(dev, bands[1].rangelow);
<------><------><------>if (cadet_getfreq(dev) == bands[1].rangelow) {
<------><------><------><------>release_region(dev->io, 2);
<------><------><------><------>return;
<------><------><------>}
<------><------><------>release_region(dev->io, 2);
<------><------>}
<------>}
<------>dev->io = -1;
}
 
/*
 * io should only be set if the user has used something like
 * isapnp (the userspace program) to initialize this card for us
 */
 
static int __init cadet_init(void)
{
<------>struct cadet *dev = &cadet_card;
<------>struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
<------>struct v4l2_ctrl_handler *hdl;
<------>int res = -ENODEV;
 
<------>strscpy(v4l2_dev->name, "cadet", sizeof(v4l2_dev->name));
<------>mutex_init(&dev->lock);
 
<------>/* If a probe was requested then probe ISAPnP first (safest) */
<------>if (io < 0)
<------><------>pnp_register_driver(&cadet_pnp_driver);
<------>dev->io = io;
 
<------>/* If that fails then probe unsafely if probe is requested */
<------>if (dev->io < 0)
<------><------>cadet_probe(dev);
 
<------>/* Else we bail out */
<------>if (dev->io < 0) {
#ifdef MODULE
<------><------>v4l2_err(v4l2_dev, "you must set an I/O address with io=0x330, 0x332, 0x334,\n");
<------><------>v4l2_err(v4l2_dev, "0x336, 0x338, 0x33a, 0x33c or 0x33e\n");
#endif
<------><------>goto fail;
<------>}
<------>if (!request_region(dev->io, 2, "cadet"))
<------><------>goto fail;
 
<------>res = v4l2_device_register(NULL, v4l2_dev);
<------>if (res < 0) {
<------><------>release_region(dev->io, 2);
<------><------>v4l2_err(v4l2_dev, "could not register v4l2_device\n");
<------><------>goto fail;
<------>}
 
<------>hdl = &dev->ctrl_handler;
<------>v4l2_ctrl_handler_init(hdl, 2);
<------>v4l2_ctrl_new_std(hdl, &cadet_ctrl_ops,
<------><------><------>V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
<------>v4l2_dev->ctrl_handler = hdl;
<------>if (hdl->error) {
<------><------>res = hdl->error;
<------><------>v4l2_err(v4l2_dev, "Could not register controls\n");
<------><------>goto err_hdl;
<------>}
 
<------>dev->is_fm_band = true;
<------>dev->curfreq = bands[dev->is_fm_band].rangelow;
<------>cadet_setfreq(dev, dev->curfreq);
<------>strscpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
<------>dev->vdev.v4l2_dev = v4l2_dev;
<------>dev->vdev.fops = &cadet_fops;
<------>dev->vdev.ioctl_ops = &cadet_ioctl_ops;
<------>dev->vdev.release = video_device_release_empty;
<------>dev->vdev.lock = &dev->lock;
<------>dev->vdev.device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO |
<------><------><------><------>V4L2_CAP_READWRITE | V4L2_CAP_RDS_CAPTURE;
<------>video_set_drvdata(&dev->vdev, dev);
 
<------>res = video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr);
<------>if (res < 0)
<------><------>goto err_hdl;
<------>v4l2_info(v4l2_dev, "ADS Cadet Radio Card at 0x%x\n", dev->io);
<------>return 0;
err_hdl:
<------>v4l2_ctrl_handler_free(hdl);
<------>v4l2_device_unregister(v4l2_dev);
<------>release_region(dev->io, 2);
fail:
<------>pnp_unregister_driver(&cadet_pnp_driver);
<------>return res;
}
 
static void __exit cadet_exit(void)
{
<------>struct cadet *dev = &cadet_card;
 
<------>video_unregister_device(&dev->vdev);
<------>v4l2_ctrl_handler_free(&dev->ctrl_handler);
<------>v4l2_device_unregister(&dev->v4l2_dev);
<------>outb(7, dev->io);	/* Mute */
<------>outb(0x00, dev->io + 1);
<------>release_region(dev->io, 2);
<------>pnp_unregister_driver(&cadet_pnp_driver);
}
 
module_init(cadet_init);
module_exit(cadet_exit);