drivers/media/radio/radio-trust.c - kernel/msm-4.19 - Gitiles

 /* radio-trust.c - Trust FM Radio card driver for Linux 2.2
  * by Eric Lammerts <eric@scintilla.utwente.nl>
  *
  * Based on radio-aztech.c. Original notes:
  *
  * Adapted to support the Video for Linux API by
  * Russell Kroll <rkroll@exploits.org>.  Based on original tuner code by:
  *
  * 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)
  *
  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  */

 #include <stdarg.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/ioport.h>
 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
 #include <linux/videodev2.h>
 #include <linux/io.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-ioctl.h>

 MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
 MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
 MODULE_LICENSE("GPL");

 /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */

 #ifndef CONFIG_RADIO_TRUST_PORT
 #define CONFIG_RADIO_TRUST_PORT -1
 #endif

 static int io = CONFIG_RADIO_TRUST_PORT;
 static int radio_nr = -1;

 module_param(io, int, 0);
 MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");
 module_param(radio_nr, int, 0);

 #define RADIO_VERSION KERNEL_VERSION(0, 0, 2)

 struct trust {
 	struct v4l2_device v4l2_dev;
 	struct video_device vdev;
 	int io;
 	int ioval;
 	__u16 curvol;
 	__u16 curbass;
 	__u16 curtreble;
 	int muted;
 	unsigned long curfreq;
 	int curstereo;
 	int curmute;
 	struct mutex lock;
 };

 static struct trust trust_card;

 /* i2c addresses */
 #define TDA7318_ADDR 0x88
 #define TSA6060T_ADDR 0xc4

 #define TR_DELAY do { inb(tr->io); inb(tr->io); inb(tr->io); } while (0)
 #define TR_SET_SCL outb(tr->ioval |= 2, tr->io)
 #define TR_CLR_SCL outb(tr->ioval &= 0xfd, tr->io)
 #define TR_SET_SDA outb(tr->ioval |= 1, tr->io)
 #define TR_CLR_SDA outb(tr->ioval &= 0xfe, tr->io)

 static void write_i2c(struct trust *tr, int n, ...)
 {
 	unsigned char val, mask;
 	va_list args;

 	va_start(args, n);

 	/* start condition */
 	TR_SET_SDA;
 	TR_SET_SCL;
 	TR_DELAY;
 	TR_CLR_SDA;
 	TR_CLR_SCL;
 	TR_DELAY;

 	for(; n; n--) {
 		val = va_arg(args, unsigned);
 		for(mask = 0x80; mask; mask >>= 1) {
 			if(val & mask)
 				TR_SET_SDA;
 			else
 				TR_CLR_SDA;
 			TR_SET_SCL;
 			TR_DELAY;
 			TR_CLR_SCL;
 			TR_DELAY;
 		}
 		/* acknowledge bit */
 		TR_SET_SDA;
 		TR_SET_SCL;
 		TR_DELAY;
 		TR_CLR_SCL;
 		TR_DELAY;
 	}

 	/* stop condition */
 	TR_CLR_SDA;
 	TR_DELAY;
 	TR_SET_SCL;
 	TR_DELAY;
 	TR_SET_SDA;
 	TR_DELAY;

 	va_end(args);
 }

 static void tr_setvol(struct trust *tr, __u16 vol)
 {
 	mutex_lock(&tr->lock);
 	tr->curvol = vol / 2048;
 	write_i2c(tr, 2, TDA7318_ADDR, tr->curvol ^ 0x1f);
 	mutex_unlock(&tr->lock);
 }

 static int basstreble2chip[15] = {
 	0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
 };

 static void tr_setbass(struct trust *tr, __u16 bass)
 {
 	mutex_lock(&tr->lock);
 	tr->curbass = bass / 4370;
 	write_i2c(tr, 2, TDA7318_ADDR, 0x60 | basstreble2chip[tr->curbass]);
 	mutex_unlock(&tr->lock);
 }

 static void tr_settreble(struct trust *tr, __u16 treble)
 {
 	mutex_lock(&tr->lock);
 	tr->curtreble = treble / 4370;
 	write_i2c(tr, 2, TDA7318_ADDR, 0x70 | basstreble2chip[tr->curtreble]);
 	mutex_unlock(&tr->lock);
 }

 static void tr_setstereo(struct trust *tr, int stereo)
 {
 	mutex_lock(&tr->lock);
 	tr->curstereo = !!stereo;
 	tr->ioval = (tr->ioval & 0xfb) | (!tr->curstereo << 2);
 	outb(tr->ioval, tr->io);
 	mutex_unlock(&tr->lock);
 }

 static void tr_setmute(struct trust *tr, int mute)
 {
 	mutex_lock(&tr->lock);
 	tr->curmute = !!mute;
 	tr->ioval = (tr->ioval & 0xf7) | (tr->curmute << 3);
 	outb(tr->ioval, tr->io);
 	mutex_unlock(&tr->lock);
 }

 static int tr_getsigstr(struct trust *tr)
 {
 	int i, v;

 	mutex_lock(&tr->lock);
 	for (i = 0, v = 0; i < 100; i++)
 		v |= inb(tr->io);
 	mutex_unlock(&tr->lock);
 	return (v & 1) ? 0 : 0xffff;
 }

 static int tr_getstereo(struct trust *tr)
 {
 	/* don't know how to determine it, just return the setting */
 	return tr->curstereo;
 }

 static void tr_setfreq(struct trust *tr, unsigned long f)
 {
 	mutex_lock(&tr->lock);
 	tr->curfreq = f;
 	f /= 160;	/* Convert to 10 kHz units	*/
 	f += 1070;	/* Add 10.7 MHz IF		*/
 	write_i2c(tr, 5, TSA6060T_ADDR, (f << 1) | 1, f >> 7, 0x60 | ((f >> 15) & 1), 0);
 	mutex_unlock(&tr->lock);
 }

 static int vidioc_querycap(struct file *file, void *priv,
 				struct v4l2_capability *v)
 {
 	strlcpy(v->driver, "radio-trust", sizeof(v->driver));
 	strlcpy(v->card, "Trust FM Radio", sizeof(v->card));
 	strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 	v->version = RADIO_VERSION;
 	v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 	return 0;
 }

 static int vidioc_g_tuner(struct file *file, void *priv,
 				struct v4l2_tuner *v)
 {
 	struct trust *tr = video_drvdata(file);

 	if (v->index > 0)
 		return -EINVAL;

 	strlcpy(v->name, "FM", sizeof(v->name));
 	v->type = V4L2_TUNER_RADIO;
 	v->rangelow = 87.5 * 16000;
 	v->rangehigh = 108 * 16000;
 	v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 	v->capability = V4L2_TUNER_CAP_LOW;
 	if (tr_getstereo(tr))
 		v->audmode = V4L2_TUNER_MODE_STEREO;
 	else
 		v->audmode = V4L2_TUNER_MODE_MONO;
 	v->signal = tr_getsigstr(tr);
 	return 0;
 }

 static int vidioc_s_tuner(struct file *file, void *priv,
 				struct v4l2_tuner *v)
 {
 	struct trust *tr = video_drvdata(file);

 	if (v->index)
 		return -EINVAL;
 	tr_setstereo(tr, v->audmode == V4L2_TUNER_MODE_STEREO);
 	return 0;
 }

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

 	if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 		return -EINVAL;
 	tr_setfreq(tr, f->frequency);
 	return 0;
 }

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

 	if (f->tuner != 0)
 		return -EINVAL;
 	f->type = V4L2_TUNER_RADIO;
 	f->frequency = tr->curfreq;
 	return 0;
 }

 static int vidioc_queryctrl(struct file *file, void *priv,
 				struct v4l2_queryctrl *qc)
 {
 	switch (qc->id) {
 	case V4L2_CID_AUDIO_MUTE:
 		return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 	case V4L2_CID_AUDIO_VOLUME:
 		return v4l2_ctrl_query_fill(qc, 0, 65535, 2048, 65535);
 	case V4L2_CID_AUDIO_BASS:
 	case V4L2_CID_AUDIO_TREBLE:
 		return v4l2_ctrl_query_fill(qc, 0, 65535, 4370, 32768);
 	}
 	return -EINVAL;
 }

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

 	switch (ctrl->id) {
 	case V4L2_CID_AUDIO_MUTE:
 		ctrl->value = tr->curmute;
 		return 0;
 	case V4L2_CID_AUDIO_VOLUME:
 		ctrl->value = tr->curvol * 2048;
 		return 0;
 	case V4L2_CID_AUDIO_BASS:
 		ctrl->value = tr->curbass * 4370;
 		return 0;
 	case V4L2_CID_AUDIO_TREBLE:
 		ctrl->value = tr->curtreble * 4370;
 		return 0;
 	}
 	return -EINVAL;
 }

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

 	switch (ctrl->id) {
 	case V4L2_CID_AUDIO_MUTE:
 		tr_setmute(tr, ctrl->value);
 		return 0;
 	case V4L2_CID_AUDIO_VOLUME:
 		tr_setvol(tr, ctrl->value);
 		return 0;
 	case V4L2_CID_AUDIO_BASS:
 		tr_setbass(tr, ctrl->value);
 		return 0;
 	case V4L2_CID_AUDIO_TREBLE:
 		tr_settreble(tr, ctrl->value);
 		return 0;
 	}
 	return -EINVAL;
 }

 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)
 {
 	return i ? -EINVAL : 0;
 }

 static int vidioc_g_audio(struct file *file, void *priv,
 				struct v4l2_audio *a)
 {
 	a->index = 0;
 	strlcpy(a->name, "Radio", sizeof(a->name));
 	a->capability = V4L2_AUDCAP_STEREO;
 	return 0;
 }

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

 static const struct v4l2_file_operations trust_fops = {
 	.owner		= THIS_MODULE,
 	.unlocked_ioctl	= video_ioctl2,
 };

 static const struct v4l2_ioctl_ops trust_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_queryctrl   = vidioc_queryctrl,
 	.vidioc_g_ctrl      = vidioc_g_ctrl,
 	.vidioc_s_ctrl      = vidioc_s_ctrl,
 	.vidioc_g_audio     = vidioc_g_audio,
 	.vidioc_s_audio     = vidioc_s_audio,
 	.vidioc_g_input     = vidioc_g_input,
 	.vidioc_s_input     = vidioc_s_input,
 };

 static int __init trust_init(void)
 {
 	struct trust *tr = &trust_card;
 	struct v4l2_device *v4l2_dev = &tr->v4l2_dev;
 	int res;

 	strlcpy(v4l2_dev->name, "trust", sizeof(v4l2_dev->name));
 	tr->io = io;
 	tr->ioval = 0xf;
 	mutex_init(&tr->lock);

 	if (tr->io == -1) {
 		v4l2_err(v4l2_dev, "You must set an I/O address with io=0x0x350 or 0x358\n");
 		return -EINVAL;
 	}
 	if (!request_region(tr->io, 2, "Trust FM Radio")) {
 		v4l2_err(v4l2_dev, "port 0x%x already in use\n", tr->io);
 		return -EBUSY;
 	}

 	res = v4l2_device_register(NULL, v4l2_dev);
 	if (res < 0) {
 		release_region(tr->io, 2);
 		v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 		return res;
 	}

 	strlcpy(tr->vdev.name, v4l2_dev->name, sizeof(tr->vdev.name));
 	tr->vdev.v4l2_dev = v4l2_dev;
 	tr->vdev.fops = &trust_fops;
 	tr->vdev.ioctl_ops = &trust_ioctl_ops;
 	tr->vdev.release = video_device_release_empty;
 	video_set_drvdata(&tr->vdev, tr);

 	write_i2c(tr, 2, TDA7318_ADDR, 0x80);	/* speaker att. LF = 0 dB */
 	write_i2c(tr, 2, TDA7318_ADDR, 0xa0);	/* speaker att. RF = 0 dB */
 	write_i2c(tr, 2, TDA7318_ADDR, 0xc0);	/* speaker att. LR = 0 dB */
 	write_i2c(tr, 2, TDA7318_ADDR, 0xe0);	/* speaker att. RR = 0 dB */
 	write_i2c(tr, 2, TDA7318_ADDR, 0x40);	/* stereo 1 input, gain = 18.75 dB */

 	tr_setvol(tr, 0xffff);
 	tr_setbass(tr, 0x8000);
 	tr_settreble(tr, 0x8000);
 	tr_setstereo(tr, 1);

 	/* mute card - prevents noisy bootups */
 	tr_setmute(tr, 1);

 	if (video_register_device(&tr->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 		v4l2_device_unregister(v4l2_dev);
 		release_region(tr->io, 2);
 		return -EINVAL;
 	}

 	v4l2_info(v4l2_dev, "Trust FM Radio card driver v1.0.\n");

 	return 0;
 }

 static void __exit cleanup_trust_module(void)
 {
 	struct trust *tr = &trust_card;

 	video_unregister_device(&tr->vdev);
 	v4l2_device_unregister(&tr->v4l2_dev);
 	release_region(tr->io, 2);
 }

 module_init(trust_init);
 module_exit(cleanup_trust_module);
	/* radio-trust.c - Trust FM Radio card driver for Linux 2.2
	* by Eric Lammerts <eric@scintilla.utwente.nl>
	*
	* Based on radio-aztech.c. Original notes:
	*
	* Adapted to support the Video for Linux API by
	* Russell Kroll <rkroll@exploits.org>. Based on original tuner code by:
	*
	* 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)
	*
	* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
	*/

	#include <stdarg.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/ioport.h>
	#include <linux/version.h> /* for KERNEL_VERSION MACRO */
	#include <linux/videodev2.h>
	#include <linux/io.h>
	#include <media/v4l2-device.h>
	#include <media/v4l2-ioctl.h>

	MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
	MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
	MODULE_LICENSE("GPL");

	/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */

	#ifndef CONFIG_RADIO_TRUST_PORT
	#define CONFIG_RADIO_TRUST_PORT -1
	#endif

	static int io = CONFIG_RADIO_TRUST_PORT;
	static int radio_nr = -1;

	module_param(io, int, 0);
	MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");
	module_param(radio_nr, int, 0);

	#define RADIO_VERSION KERNEL_VERSION(0, 0, 2)

	struct trust {
	struct v4l2_device v4l2_dev;
	struct video_device vdev;
	int io;
	int ioval;
	__u16 curvol;
	__u16 curbass;
	__u16 curtreble;
	int muted;
	unsigned long curfreq;
	int curstereo;
	int curmute;
	struct mutex lock;
	};

	static struct trust trust_card;

	/* i2c addresses */
	#define TDA7318_ADDR 0x88
	#define TSA6060T_ADDR 0xc4

	#define TR_DELAY do { inb(tr->io); inb(tr->io); inb(tr->io); } while (0)
	#define TR_SET_SCL outb(tr->ioval \|= 2, tr->io)
	#define TR_CLR_SCL outb(tr->ioval &= 0xfd, tr->io)
	#define TR_SET_SDA outb(tr->ioval \|= 1, tr->io)
	#define TR_CLR_SDA outb(tr->ioval &= 0xfe, tr->io)

	static void write_i2c(struct trust *tr, int n, ...)
	{
	unsigned char val, mask;
	va_list args;

	va_start(args, n);

	/* start condition */
	TR_SET_SDA;
	TR_SET_SCL;
	TR_DELAY;
	TR_CLR_SDA;
	TR_CLR_SCL;
	TR_DELAY;

	for(; n; n--) {
	val = va_arg(args, unsigned);
	for(mask = 0x80; mask; mask >>= 1) {
	if(val & mask)
	TR_SET_SDA;
	else
	TR_CLR_SDA;
	TR_SET_SCL;
	TR_DELAY;
	TR_CLR_SCL;
	TR_DELAY;
	}
	/* acknowledge bit */
	TR_SET_SDA;
	TR_SET_SCL;
	TR_DELAY;
	TR_CLR_SCL;
	TR_DELAY;
	}

	/* stop condition */
	TR_CLR_SDA;
	TR_DELAY;
	TR_SET_SCL;
	TR_DELAY;
	TR_SET_SDA;
	TR_DELAY;

	va_end(args);
	}

	static void tr_setvol(struct trust *tr, __u16 vol)
	{
	mutex_lock(&tr->lock);
	tr->curvol = vol / 2048;
	write_i2c(tr, 2, TDA7318_ADDR, tr->curvol ^ 0x1f);
	mutex_unlock(&tr->lock);
	}

	static int basstreble2chip[15] = {
	0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
	};

	static void tr_setbass(struct trust *tr, __u16 bass)
	{
	mutex_lock(&tr->lock);
	tr->curbass = bass / 4370;
	write_i2c(tr, 2, TDA7318_ADDR, 0x60 \| basstreble2chip[tr->curbass]);
	mutex_unlock(&tr->lock);
	}

	static void tr_settreble(struct trust *tr, __u16 treble)
	{
	mutex_lock(&tr->lock);
	tr->curtreble = treble / 4370;
	write_i2c(tr, 2, TDA7318_ADDR, 0x70 \| basstreble2chip[tr->curtreble]);
	mutex_unlock(&tr->lock);
	}

	static void tr_setstereo(struct trust *tr, int stereo)
	{
	mutex_lock(&tr->lock);
	tr->curstereo = !!stereo;
	tr->ioval = (tr->ioval & 0xfb) \| (!tr->curstereo << 2);
	outb(tr->ioval, tr->io);
	mutex_unlock(&tr->lock);
	}

	static void tr_setmute(struct trust *tr, int mute)
	{
	mutex_lock(&tr->lock);
	tr->curmute = !!mute;
	tr->ioval = (tr->ioval & 0xf7) \| (tr->curmute << 3);
	outb(tr->ioval, tr->io);
	mutex_unlock(&tr->lock);
	}

	static int tr_getsigstr(struct trust *tr)
	{
	int i, v;

	mutex_lock(&tr->lock);
	for (i = 0, v = 0; i < 100; i++)
	v \|= inb(tr->io);
	mutex_unlock(&tr->lock);
	return (v & 1) ? 0 : 0xffff;
	}

	static int tr_getstereo(struct trust *tr)
	{
	/* don't know how to determine it, just return the setting */
	return tr->curstereo;
	}

	static void tr_setfreq(struct trust *tr, unsigned long f)
	{
	mutex_lock(&tr->lock);
	tr->curfreq = f;
	f /= 160; /* Convert to 10 kHz units */
	f += 1070; /* Add 10.7 MHz IF */
	write_i2c(tr, 5, TSA6060T_ADDR, (f << 1) \| 1, f >> 7, 0x60 \| ((f >> 15) & 1), 0);
	mutex_unlock(&tr->lock);
	}

	static int vidioc_querycap(struct file file, void priv,
	struct v4l2_capability *v)
	{
	strlcpy(v->driver, "radio-trust", sizeof(v->driver));
	strlcpy(v->card, "Trust FM Radio", sizeof(v->card));
	strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
	v->version = RADIO_VERSION;
	v->capabilities = V4L2_CAP_TUNER \| V4L2_CAP_RADIO;
	return 0;
	}

	static int vidioc_g_tuner(struct file file, void priv,
	struct v4l2_tuner *v)
	{
	struct trust *tr = video_drvdata(file);

	if (v->index > 0)
	return -EINVAL;

	strlcpy(v->name, "FM", sizeof(v->name));
	v->type = V4L2_TUNER_RADIO;
	v->rangelow = 87.5 * 16000;
	v->rangehigh = 108 * 16000;
	v->rxsubchans = V4L2_TUNER_SUB_MONO \| V4L2_TUNER_SUB_STEREO;
	v->capability = V4L2_TUNER_CAP_LOW;
	if (tr_getstereo(tr))
	v->audmode = V4L2_TUNER_MODE_STEREO;
	else
	v->audmode = V4L2_TUNER_MODE_MONO;
	v->signal = tr_getsigstr(tr);
	return 0;
	}

	static int vidioc_s_tuner(struct file file, void priv,
	struct v4l2_tuner *v)
	{
	struct trust *tr = video_drvdata(file);

	if (v->index)
	return -EINVAL;
	tr_setstereo(tr, v->audmode == V4L2_TUNER_MODE_STEREO);
	return 0;
	}

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

	if (f->tuner != 0 \|\| f->type != V4L2_TUNER_RADIO)
	return -EINVAL;
	tr_setfreq(tr, f->frequency);
	return 0;
	}

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

	if (f->tuner != 0)
	return -EINVAL;
	f->type = V4L2_TUNER_RADIO;
	f->frequency = tr->curfreq;
	return 0;
	}

	static int vidioc_queryctrl(struct file file, void priv,
	struct v4l2_queryctrl *qc)
	{
	switch (qc->id) {
	case V4L2_CID_AUDIO_MUTE:
	return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
	case V4L2_CID_AUDIO_VOLUME:
	return v4l2_ctrl_query_fill(qc, 0, 65535, 2048, 65535);
	case V4L2_CID_AUDIO_BASS:
	case V4L2_CID_AUDIO_TREBLE:
	return v4l2_ctrl_query_fill(qc, 0, 65535, 4370, 32768);
	}
	return -EINVAL;
	}

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

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
	ctrl->value = tr->curmute;
	return 0;
	case V4L2_CID_AUDIO_VOLUME:
	ctrl->value = tr->curvol * 2048;
	return 0;
	case V4L2_CID_AUDIO_BASS:
	ctrl->value = tr->curbass * 4370;
	return 0;
	case V4L2_CID_AUDIO_TREBLE:
	ctrl->value = tr->curtreble * 4370;
	return 0;
	}
	return -EINVAL;
	}

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

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
	tr_setmute(tr, ctrl->value);
	return 0;
	case V4L2_CID_AUDIO_VOLUME:
	tr_setvol(tr, ctrl->value);
	return 0;
	case V4L2_CID_AUDIO_BASS:
	tr_setbass(tr, ctrl->value);
	return 0;
	case V4L2_CID_AUDIO_TREBLE:
	tr_settreble(tr, ctrl->value);
	return 0;
	}
	return -EINVAL;
	}

	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)
	{
	return i ? -EINVAL : 0;
	}

	static int vidioc_g_audio(struct file file, void priv,
	struct v4l2_audio *a)
	{
	a->index = 0;
	strlcpy(a->name, "Radio", sizeof(a->name));
	a->capability = V4L2_AUDCAP_STEREO;
	return 0;
	}

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

	static const struct v4l2_file_operations trust_fops = {
	.owner = THIS_MODULE,
	.unlocked_ioctl = video_ioctl2,
	};

	static const struct v4l2_ioctl_ops trust_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_queryctrl = vidioc_queryctrl,
	.vidioc_g_ctrl = vidioc_g_ctrl,
	.vidioc_s_ctrl = vidioc_s_ctrl,
	.vidioc_g_audio = vidioc_g_audio,
	.vidioc_s_audio = vidioc_s_audio,
	.vidioc_g_input = vidioc_g_input,
	.vidioc_s_input = vidioc_s_input,
	};

	static int __init trust_init(void)
	{
	struct trust *tr = &trust_card;
	struct v4l2_device *v4l2_dev = &tr->v4l2_dev;
	int res;

	strlcpy(v4l2_dev->name, "trust", sizeof(v4l2_dev->name));
	tr->io = io;
	tr->ioval = 0xf;
	mutex_init(&tr->lock);

	if (tr->io == -1) {
	v4l2_err(v4l2_dev, "You must set an I/O address with io=0x0x350 or 0x358\n");
	return -EINVAL;
	}
	if (!request_region(tr->io, 2, "Trust FM Radio")) {
	v4l2_err(v4l2_dev, "port 0x%x already in use\n", tr->io);
	return -EBUSY;
	}

	res = v4l2_device_register(NULL, v4l2_dev);
	if (res < 0) {
	release_region(tr->io, 2);
	v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
	return res;
	}

	strlcpy(tr->vdev.name, v4l2_dev->name, sizeof(tr->vdev.name));
	tr->vdev.v4l2_dev = v4l2_dev;
	tr->vdev.fops = &trust_fops;
	tr->vdev.ioctl_ops = &trust_ioctl_ops;
	tr->vdev.release = video_device_release_empty;
	video_set_drvdata(&tr->vdev, tr);

	write_i2c(tr, 2, TDA7318_ADDR, 0x80); /* speaker att. LF = 0 dB */
	write_i2c(tr, 2, TDA7318_ADDR, 0xa0); /* speaker att. RF = 0 dB */
	write_i2c(tr, 2, TDA7318_ADDR, 0xc0); /* speaker att. LR = 0 dB */
	write_i2c(tr, 2, TDA7318_ADDR, 0xe0); /* speaker att. RR = 0 dB */
	write_i2c(tr, 2, TDA7318_ADDR, 0x40); /* stereo 1 input, gain = 18.75 dB */

	tr_setvol(tr, 0xffff);
	tr_setbass(tr, 0x8000);
	tr_settreble(tr, 0x8000);
	tr_setstereo(tr, 1);

	/* mute card - prevents noisy bootups */
	tr_setmute(tr, 1);

	if (video_register_device(&tr->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
	v4l2_device_unregister(v4l2_dev);
	release_region(tr->io, 2);
	return -EINVAL;
	}

	v4l2_info(v4l2_dev, "Trust FM Radio card driver v1.0.\n");

	return 0;
	}

	static void __exit cleanup_trust_module(void)
	{
	struct trust *tr = &trust_card;

	video_unregister_device(&tr->vdev);
	v4l2_device_unregister(&tr->v4l2_dev);
	release_region(tr->io, 2);
	}

	module_init(trust_init);
	module_exit(cleanup_trust_module);