radio-gemtek.c

trident tm5600的linux驱动

	return 1;
}

/*
 * Automatic probing for card.
 */
static int gemtek_probe(void)
{
	int ioports[] = { 0x20c, 0x30c, 0x24c, 0x34c, 0x248, 0x28c };
	int i;

	if (!probe) {
		printk(KERN_INFO "Automatic device probing disabled.\n");
		return -1;
	}

	printk(KERN_INFO "Automatic device probing enabled.\n");

	for (i = 0; i < ARRAY_SIZE(ioports); ++i) {
		printk(KERN_INFO "Trying I/O port 0x%x...\n", ioports[i]);

		if (!request_region(ioports[i], 1, "gemtek-probe")) {
			printk(KERN_WARNING "I/O port 0x%x busy!\n",
			       ioports[i]);
			continue;
		}

		if (gemtek_verify(ioports[i])) {
			printk(KERN_INFO "Card found from I/O port "
			       "0x%x!\n", ioports[i]);

			release_region(ioports[i], 1);

			io = ioports[i];
			return io;
		}

		release_region(ioports[i], 1);
	}

	printk(KERN_ERR "Automatic probing failed!\n");

	return -1;
}

/*
 * Video 4 Linux stuff.
 */

static struct v4l2_queryctrl radio_qctrl[] = {
	{
		.id = V4L2_CID_AUDIO_MUTE,
		.name = "Mute",
		.minimum = 0,
		.maximum = 1,
		.default_value = 1,
		.type = V4L2_CTRL_TYPE_BOOLEAN,
	}, {
		.id = V4L2_CID_AUDIO_VOLUME,
		.name = "Volume",
		.minimum = 0,
		.maximum = 65535,
		.step = 65535,
		.default_value = 0xff,
		.type = V4L2_CTRL_TYPE_INTEGER,
	}
};

static int gemtek_exclusive_open(struct inode *inode, struct file *file)
{
	return test_and_set_bit(0, &in_use) ? -EBUSY : 0;
}

static int gemtek_exclusive_release(struct inode *inode, struct file *file)
{
	clear_bit(0, &in_use);
	return 0;
}

static const struct file_operations gemtek_fops = {
	.owner		= THIS_MODULE,
	.open		= gemtek_exclusive_open,
	.release	= gemtek_exclusive_release,
	.ioctl		= video_ioctl2,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= v4l_compat_ioctl32,
#endif
	.llseek		= no_llseek
};

static int vidioc_querycap(struct file *file, void *priv,
			   struct v4l2_capability *v)
{
	strlcpy(v->driver, "radio-gemtek", sizeof(v->driver));
	strlcpy(v->card, "GemTek", sizeof(v->card));
	sprintf(v->bus_info, "ISA");
	v->version = RADIO_VERSION;
	v->capabilities = V4L2_CAP_TUNER;
	return 0;
}

static int vidioc_g_tuner(struct file *file, void *priv, struct v4l2_tuner *v)
{
	if (v->index > 0)
		return -EINVAL;

	strcpy(v->name, "FM");
	v->type = V4L2_TUNER_RADIO;
	v->rangelow = GEMTEK_LOWFREQ;
	v->rangehigh = GEMTEK_HIGHFREQ;
	v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
	v->signal = 0xffff * gemtek_getsigstr();
	if (v->signal) {
		v->audmode = V4L2_TUNER_MODE_STEREO;
		v->rxsubchans = V4L2_TUNER_SUB_STEREO;
	} else {
		v->audmode = V4L2_TUNER_MODE_MONO;
		v->rxsubchans = V4L2_TUNER_SUB_MONO;
	}

	return 0;
}

static int vidioc_s_tuner(struct file *file, void *priv, struct v4l2_tuner *v)
{
	if (v->index > 0)
		return -EINVAL;
	return 0;
}

static int vidioc_s_frequency(struct file *file, void *priv,
			      struct v4l2_frequency *f)
{
	struct gemtek_device *rt = video_drvdata(file);

	gemtek_setfreq(rt, f->frequency);

	return 0;
}

static int vidioc_g_frequency(struct file *file, void *priv,
			      struct v4l2_frequency *f)
{
	struct gemtek_device *rt = video_drvdata(file);

	f->type = V4L2_TUNER_RADIO;
	f->frequency = rt->lastfreq;
	return 0;
}

static int vidioc_queryctrl(struct file *file, void *priv,
			    struct v4l2_queryctrl *qc)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(radio_qctrl); ++i) {
		if (qc->id && qc->id == radio_qctrl[i].id) {
			memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
			return 0;
		}
	}
	return -EINVAL;
}

static int vidioc_g_ctrl(struct file *file, void *priv,
			 struct v4l2_control *ctrl)
{
	struct gemtek_device *rt = video_drvdata(file);

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		ctrl->value = rt->muted;
		return 0;
	case V4L2_CID_AUDIO_VOLUME:
		if (rt->muted)
			ctrl->value = 0;
		else
			ctrl->value = 65535;
		return 0;
	}
	return -EINVAL;
}

static int vidioc_s_ctrl(struct file *file, void *priv,
			 struct v4l2_control *ctrl)
{
	struct gemtek_device *rt = video_drvdata(file);

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		if (ctrl->value)
			gemtek_mute(rt);
		else
			gemtek_unmute(rt);
		return 0;
	case V4L2_CID_AUDIO_VOLUME:
		if (ctrl->value)
			gemtek_unmute(rt);
		else
			gemtek_mute(rt);
		return 0;
	}
	return -EINVAL;
}

static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
{
	if (a->index > 1)
		return -EINVAL;

	strcpy(a->name, "Radio");
	a->capability = V4L2_AUDCAP_STEREO;
	return 0;
}

static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
{
	*i = 0;
	return 0;
}

static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
{
	if (i != 0)
		return -EINVAL;
	return 0;
}

static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a)
{
	if (a->index != 0)
		return -EINVAL;
	return 0;
}

static const struct v4l2_ioctl_ops gemtek_ioctl_ops = {
	.vidioc_querycap	= vidioc_querycap,
	.vidioc_g_tuner		= vidioc_g_tuner,
	.vidioc_s_tuner		= vidioc_s_tuner,
	.vidioc_g_audio		= vidioc_g_audio,
	.vidioc_s_audio		= vidioc_s_audio,
	.vidioc_g_input		= vidioc_g_input,
	.vidioc_s_input		= vidioc_s_input,
	.vidioc_g_frequency	= vidioc_g_frequency,
	.vidioc_s_frequency	= vidioc_s_frequency,
	.vidioc_queryctrl	= vidioc_queryctrl,
	.vidioc_g_ctrl		= vidioc_g_ctrl,
	.vidioc_s_ctrl		= vidioc_s_ctrl
};

static struct video_device gemtek_radio = {
	.name		= "GemTek Radio card",
	.fops		= &gemtek_fops,
	.ioctl_ops 	= &gemtek_ioctl_ops,
	.release	= video_device_release_empty,
};

/*
 * Initialization / cleanup related stuff.
 */

/*
 * Initilize card.
 */
static int __init gemtek_init(void)
{
	printk(KERN_INFO RADIO_BANNER "\n");

	spin_lock_init(&lock);

	gemtek_probe();
	if (io) {
		if (!request_region(io, 1, "gemtek")) {
			printk(KERN_ERR "I/O port 0x%x already in use.\n", io);
			return -EBUSY;
		}

		if (!gemtek_verify(io))
			printk(KERN_WARNING "Card at I/O port 0x%x does not "
			       "respond properly, check your "
			       "configuration.\n", io);
		else
			printk(KERN_INFO "Using I/O port 0x%x.\n", io);
	} else if (probe) {
		printk(KERN_ERR "Automatic probing failed and no "
		       "fixed I/O port defined.\n");
		return -ENODEV;
	} else {
		printk(KERN_ERR "Automatic probing disabled but no fixed "
		       "I/O port defined.");
		return -EINVAL;
	}

	video_set_drvdata(&gemtek_radio, &gemtek_unit);

	if (video_register_device(&gemtek_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
		release_region(io, 1);
		return -EBUSY;
	}

	/* Set defaults */
	gemtek_unit.lastfreq = GEMTEK_LOWFREQ;
	gemtek_unit.bu2614data = 0;

	if (initmute)
		gemtek_mute(&gemtek_unit);

	return 0;
}

/*
 * Module cleanup
 */
static void __exit gemtek_exit(void)
{
	if (shutdown) {
		hardmute = 1;	/* Turn off PLL */
		gemtek_mute(&gemtek_unit);
	} else {
		printk(KERN_INFO "Module unloaded but card not muted!\n");
	}

	video_unregister_device(&gemtek_radio);
	release_region(io, 1);
}

module_init(gemtek_init);
module_exit(gemtek_exit);