V4L/DVB (12413): radio-si470x: separate common and usb code

This patch is a preceding work to add the i2c interface of si470x.
The si470x directory includes a common file and usb specific file and
header file.
The part unrelated with usb interface and i2c interface exists in
radio-si470x-common.c file, and The usb specific part exists in
radio-si470x-usb.c file.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
[tobias.lorenz@gmx.net: Small changes, due to new include "linux/smp_lock.h"]
Signed-off-by: Tobias Lorenz <tobias.lorenz@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 794 insertions, 0 deletions

diff --git a/drivers/media/radio/si470x/radio-si470x-common.c b/drivers/media/radio/si470x/radio-si470x-common.c
new file mode 100644
index 000000000000..b64559d561e5
--- /dev/null
+++ b/drivers/media/radio/si470x/radio-si470x-common.c
@@ -0,0 +1,794 @@
+/*
+ *  drivers/media/radio/si470x/radio-si470x-common.c
+ *
+ *  Driver for radios with Silicon Labs Si470x FM Radio Receivers
+ *
+ *  Copyright (c) 2009 Tobias Lorenz <tobias.lorenz@gmx.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+
+/*
+ * History:
+ * 2008-01-12	Tobias Lorenz <tobias.lorenz@gmx.net>
+ *		Version 1.0.0
+ *		- First working version
+ * 2008-01-13	Tobias Lorenz <tobias.lorenz@gmx.net>
+ *		Version 1.0.1
+ *		- Improved error handling, every function now returns errno
+ *		- Improved multi user access (start/mute/stop)
+ *		- Channel doesn't get lost anymore after start/mute/stop
+ *		- RDS support added (polling mode via interrupt EP 1)
+ *		- marked default module parameters with *value*
+ *		- switched from bit structs to bit masks
+ *		- header file cleaned and integrated
+ * 2008-01-14	Tobias Lorenz <tobias.lorenz@gmx.net>
+ * 		Version 1.0.2
+ * 		- hex values are now lower case
+ * 		- commented USB ID for ADS/Tech moved on todo list
+ * 		- blacklisted si470x in hid-quirks.c
+ * 		- rds buffer handling functions integrated into *_work, *_read
+ * 		- rds_command in si470x_poll exchanged against simple retval
+ * 		- check for firmware version 15
+ * 		- code order and prototypes still remain the same
+ * 		- spacing and bottom of band codes remain the same
+ * 2008-01-16	Tobias Lorenz <tobias.lorenz@gmx.net>
+ *		Version 1.0.3
+ * 		- code reordered to avoid function prototypes
+ *		- switch/case defaults are now more user-friendly
+ *		- unified comment style
+ *		- applied all checkpatch.pl v1.12 suggestions
+ *		  except the warning about the too long lines with bit comments
+ *		- renamed FMRADIO to RADIO to cut line length (checkpatch.pl)
+ * 2008-01-22	Tobias Lorenz <tobias.lorenz@gmx.net>
+ *		Version 1.0.4
+ *		- avoid poss. locking when doing copy_to_user which may sleep
+ *		- RDS is automatically activated on read now
+ *		- code cleaned of unnecessary rds_commands
+ *		- USB Vendor/Product ID for ADS/Tech FM Radio Receiver verified
+ *		  (thanks to Guillaume RAMOUSSE)
+ * 2008-01-27	Tobias Lorenz <tobias.lorenz@gmx.net>
+ *		Version 1.0.5
+ *		- number of seek_retries changed to tune_timeout
+ *		- fixed problem with incomplete tune operations by own buffers
+ *		- optimization of variables and printf types
+ *		- improved error logging
+ * 2008-01-31	Tobias Lorenz <tobias.lorenz@gmx.net>
+ *		Oliver Neukum <oliver@neukum.org>
+ *		Version 1.0.6
+ *		- fixed coverity checker warnings in *_usb_driver_disconnect
+ *		- probe()/open() race by correct ordering in probe()
+ *		- DMA coherency rules by separate allocation of all buffers
+ *		- use of endianness macros
+ *		- abuse of spinlock, replaced by mutex
+ *		- racy handling of timer in disconnect,
+ *		  replaced by delayed_work
+ *		- racy interruptible_sleep_on(),
+ *		  replaced with wait_event_interruptible()
+ *		- handle signals in read()
+ * 2008-02-08	Tobias Lorenz <tobias.lorenz@gmx.net>
+ *		Oliver Neukum <oliver@neukum.org>
+ *		Version 1.0.7
+ *		- usb autosuspend support
+ *		- unplugging fixed
+ * 2008-05-07	Tobias Lorenz <tobias.lorenz@gmx.net>
+ *		Version 1.0.8
+ *		- hardware frequency seek support
+ *		- afc indication
+ *		- more safety checks, let si470x_get_freq return errno
+ *		- vidioc behavior corrected according to v4l2 spec
+ * 2008-10-20	Alexey Klimov <klimov.linux@gmail.com>
+ * 		- add support for KWorld USB FM Radio FM700
+ * 		- blacklisted KWorld radio in hid-core.c and hid-ids.h
+ * 2008-12-03	Mark Lord <mlord@pobox.com>
+ *		- add support for DealExtreme USB Radio
+ * 2009-01-31	Bob Ross <pigiron@gmx.com>
+ *		- correction of stereo detection/setting
+ *		- correction of signal strength indicator scaling
+ * 2009-01-31	Rick Bronson <rick@efn.org>
+ *		Tobias Lorenz <tobias.lorenz@gmx.net>
+ *		- add LED status output
+ *		- get HW/SW version from scratchpad
+ * 2009-06-16   Edouard Lafargue <edouard@lafargue.name>
+ *		Version 1.0.10
+ *		- add support for interrupt mode for RDS endpoint,
+ *                instead of polling.
+ *                Improves RDS reception significantly
+ */
+
+
+/* kernel includes */
+#include "radio-si470x.h"
+
+
+
+/**************************************************************************
+ * Module Parameters
+ **************************************************************************/
+
+/* Spacing (kHz) */
+/* 0: 200 kHz (USA, Australia) */
+/* 1: 100 kHz (Europe, Japan) */
+/* 2:  50 kHz */
+static unsigned short space = 2;
+module_param(space, ushort, 0444);
+MODULE_PARM_DESC(space, "Spacing: 0=200kHz 1=100kHz *2=50kHz*");
+
+/* Bottom of Band (MHz) */
+/* 0: 87.5 - 108 MHz (USA, Europe)*/
+/* 1: 76   - 108 MHz (Japan wide band) */
+/* 2: 76   -  90 MHz (Japan) */
+static unsigned short band = 1;
+module_param(band, ushort, 0444);
+MODULE_PARM_DESC(band, "Band: 0=87.5..108MHz *1=76..108MHz* 2=76..90MHz");
+
+/* De-emphasis */
+/* 0: 75 us (USA) */
+/* 1: 50 us (Europe, Australia, Japan) */
+static unsigned short de = 1;
+module_param(de, ushort, 0444);
+MODULE_PARM_DESC(de, "De-emphasis: 0=75us *1=50us*");
+
+/* Tune timeout */
+static unsigned int tune_timeout = 3000;
+module_param(tune_timeout, uint, 0644);
+MODULE_PARM_DESC(tune_timeout, "Tune timeout: *3000*");
+
+/* Seek timeout */
+static unsigned int seek_timeout = 5000;
+module_param(seek_timeout, uint, 0644);
+MODULE_PARM_DESC(seek_timeout, "Seek timeout: *5000*");
+
+
+
+/**************************************************************************
+ * Generic Functions
+ **************************************************************************/
+
+/*
+ * si470x_set_chan - set the channel
+ */
+static int si470x_set_chan(struct si470x_device *radio, unsigned short chan)
+{
+	int retval;
+	unsigned long timeout;
+	bool timed_out = 0;
+
+	/* start tuning */
+	radio->registers[CHANNEL] &= ~CHANNEL_CHAN;
+	radio->registers[CHANNEL] |= CHANNEL_TUNE | chan;
+	retval = si470x_set_register(radio, CHANNEL);
+	if (retval < 0)
+		goto done;
+
+	/* wait till tune operation has completed */
+	timeout = jiffies + msecs_to_jiffies(tune_timeout);
+	do {
+		retval = si470x_get_register(radio, STATUSRSSI);
+		if (retval < 0)
+			goto stop;
+		timed_out = time_after(jiffies, timeout);
+	} while (((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0) &&
+		(!timed_out));
+	if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
+		printk(KERN_WARNING DRIVER_NAME ": tune does not complete\n");
+	if (timed_out)
+		printk(KERN_WARNING DRIVER_NAME
+			": tune timed out after %u ms\n", tune_timeout);
+
+stop:
+	/* stop tuning */
+	radio->registers[CHANNEL] &= ~CHANNEL_TUNE;
+	retval = si470x_set_register(radio, CHANNEL);
+
+done:
+	return retval;
+}
+
+
+/*
+ * si470x_get_freq - get the frequency
+ */
+static int si470x_get_freq(struct si470x_device *radio, unsigned int *freq)
+{
+	unsigned int spacing, band_bottom;
+	unsigned short chan;
+	int retval;
+
+	/* Spacing (kHz) */
+	switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) {
+	/* 0: 200 kHz (USA, Australia) */
+	case 0:
+		spacing = 0.200 * FREQ_MUL; break;
+	/* 1: 100 kHz (Europe, Japan) */
+	case 1:
+		spacing = 0.100 * FREQ_MUL; break;
+	/* 2:  50 kHz */
+	default:
+		spacing = 0.050 * FREQ_MUL; break;
+	};
+
+	/* Bottom of Band (MHz) */
+	switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
+	/* 0: 87.5 - 108 MHz (USA, Europe) */
+	case 0:
+		band_bottom = 87.5 * FREQ_MUL; break;
+	/* 1: 76   - 108 MHz (Japan wide band) */
+	default:
+		band_bottom = 76   * FREQ_MUL; break;
+	/* 2: 76   -  90 MHz (Japan) */
+	case 2:
+		band_bottom = 76   * FREQ_MUL; break;
+	};
+
+	/* read channel */
+	retval = si470x_get_register(radio, READCHAN);
+	chan = radio->registers[READCHAN] & READCHAN_READCHAN;
+
+	/* Frequency (MHz) = Spacing (kHz) x Channel + Bottom of Band (MHz) */
+	*freq = chan * spacing + band_bottom;
+
+	return retval;
+}
+
+
+/*
+ * si470x_set_freq - set the frequency
+ */
+int si470x_set_freq(struct si470x_device *radio, unsigned int freq)
+{
+	unsigned int spacing, band_bottom;
+	unsigned short chan;
+
+	/* Spacing (kHz) */
+	switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) {
+	/* 0: 200 kHz (USA, Australia) */
+	case 0:
+		spacing = 0.200 * FREQ_MUL; break;
+	/* 1: 100 kHz (Europe, Japan) */
+	case 1:
+		spacing = 0.100 * FREQ_MUL; break;
+	/* 2:  50 kHz */
+	default:
+		spacing = 0.050 * FREQ_MUL; break;
+	};
+
+	/* Bottom of Band (MHz) */
+	switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
+	/* 0: 87.5 - 108 MHz (USA, Europe) */
+	case 0:
+		band_bottom = 87.5 * FREQ_MUL; break;
+	/* 1: 76   - 108 MHz (Japan wide band) */
+	default:
+		band_bottom = 76   * FREQ_MUL; break;
+	/* 2: 76   -  90 MHz (Japan) */
+	case 2:
+		band_bottom = 76   * FREQ_MUL; break;
+	};
+
+	/* Chan = [ Freq (Mhz) - Bottom of Band (MHz) ] / Spacing (kHz) */
+	chan = (freq - band_bottom) / spacing;
+
+	return si470x_set_chan(radio, chan);
+}
+
+
+/*
+ * si470x_set_seek - set seek
+ */
+static int si470x_set_seek(struct si470x_device *radio,
+		unsigned int wrap_around, unsigned int seek_upward)
+{
+	int retval = 0;
+	unsigned long timeout;
+	bool timed_out = 0;
+
+	/* start seeking */
+	radio->registers[POWERCFG] |= POWERCFG_SEEK;
+	if (wrap_around == 1)
+		radio->registers[POWERCFG] &= ~POWERCFG_SKMODE;
+	else
+		radio->registers[POWERCFG] |= POWERCFG_SKMODE;
+	if (seek_upward == 1)
+		radio->registers[POWERCFG] |= POWERCFG_SEEKUP;
+	else
+		radio->registers[POWERCFG] &= ~POWERCFG_SEEKUP;
+	retval = si470x_set_register(radio, POWERCFG);
+	if (retval < 0)
+		goto done;
+
+	/* wait till seek operation has completed */
+	timeout = jiffies + msecs_to_jiffies(seek_timeout);
+	do {
+		retval = si470x_get_register(radio, STATUSRSSI);
+		if (retval < 0)
+			goto stop;
+		timed_out = time_after(jiffies, timeout);
+	} while (((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0) &&
+		(!timed_out));
+	if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
+		printk(KERN_WARNING DRIVER_NAME ": seek does not complete\n");
+	if (radio->registers[STATUSRSSI] & STATUSRSSI_SF)
+		printk(KERN_WARNING DRIVER_NAME
+			": seek failed / band limit reached\n");
+	if (timed_out)
+		printk(KERN_WARNING DRIVER_NAME
+			": seek timed out after %u ms\n", seek_timeout);
+
+stop:
+	/* stop seeking */
+	radio->registers[POWERCFG] &= ~POWERCFG_SEEK;
+	retval = si470x_set_register(radio, POWERCFG);
+
+done:
+	/* try again, if timed out */
+	if ((retval == 0) && timed_out)
+		retval = -EAGAIN;
+
+	return retval;
+}
+
+
+/*
+ * si470x_start - switch on radio
+ */
+int si470x_start(struct si470x_device *radio)
+{
+	int retval;
+
+	/* powercfg */
+	radio->registers[POWERCFG] =
+		POWERCFG_DMUTE | POWERCFG_ENABLE | POWERCFG_RDSM;
+	retval = si470x_set_register(radio, POWERCFG);
+	if (retval < 0)
+		goto done;
+
+	/* sysconfig 1 */
+	radio->registers[SYSCONFIG1] = SYSCONFIG1_DE;
+	retval = si470x_set_register(radio, SYSCONFIG1);
+	if (retval < 0)
+		goto done;
+
+	/* sysconfig 2 */
+	radio->registers[SYSCONFIG2] =
+		(0x3f  << 8) |				/* SEEKTH */
+		((band  << 6) & SYSCONFIG2_BAND)  |	/* BAND */
+		((space << 4) & SYSCONFIG2_SPACE) |	/* SPACE */
+		15;					/* VOLUME (max) */
+	retval = si470x_set_register(radio, SYSCONFIG2);
+	if (retval < 0)
+		goto done;
+
+	/* reset last channel */
+	retval = si470x_set_chan(radio,
+		radio->registers[CHANNEL] & CHANNEL_CHAN);
+
+done:
+	return retval;
+}
+
+
+/*
+ * si470x_stop - switch off radio
+ */
+int si470x_stop(struct si470x_device *radio)
+{
+	int retval;
+
+	/* sysconfig 1 */
+	radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
+	retval = si470x_set_register(radio, SYSCONFIG1);
+	if (retval < 0)
+		goto done;
+
+	/* powercfg */
+	radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
+	/* POWERCFG_ENABLE has to automatically go low */
+	radio->registers[POWERCFG] |= POWERCFG_ENABLE |	POWERCFG_DISABLE;
+	retval = si470x_set_register(radio, POWERCFG);
+
+done:
+	return retval;
+}
+
+
+/*
+ * si470x_rds_on - switch on rds reception
+ */
+int si470x_rds_on(struct si470x_device *radio)
+{
+	int retval;
+
+	/* sysconfig 1 */
+	mutex_lock(&radio->lock);
+	radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDS;
+	retval = si470x_set_register(radio, SYSCONFIG1);
+	if (retval < 0)
+		radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
+	mutex_unlock(&radio->lock);
+
+	return retval;
+}
+
+
+
+/**************************************************************************
+ * Video4Linux Interface
+ **************************************************************************/
+
+/*
+ * si470x_vidioc_queryctrl - enumerate control items
+ */
+static int si470x_vidioc_queryctrl(struct file *file, void *priv,
+		struct v4l2_queryctrl *qc)
+{
+	int retval = -EINVAL;
+
+	/* abort if qc->id is below V4L2_CID_BASE */
+	if (qc->id < V4L2_CID_BASE)
+		goto done;
+
+	/* search video control */
+	switch (qc->id) {
+	case V4L2_CID_AUDIO_VOLUME:
+		return v4l2_ctrl_query_fill(qc, 0, 15, 1, 15);
+	case V4L2_CID_AUDIO_MUTE:
+		return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
+	}
+
+	/* disable unsupported base controls */
+	/* to satisfy kradio and such apps */
+	if ((retval == -EINVAL) && (qc->id < V4L2_CID_LASTP1)) {
+		qc->flags = V4L2_CTRL_FLAG_DISABLED;
+		retval = 0;
+	}
+
+done:
+	if (retval < 0)
+		printk(KERN_WARNING DRIVER_NAME
+			": query controls failed with %d\n", retval);
+	return retval;
+}
+
+
+/*
+ * si470x_vidioc_g_ctrl - get the value of a control
+ */
+static int si470x_vidioc_g_ctrl(struct file *file, void *priv,
+		struct v4l2_control *ctrl)
+{
+	struct si470x_device *radio = video_drvdata(file);
+	int retval = 0;
+
+	/* safety checks */
+	if (radio->disconnected) {
+		retval = -EIO;
+		goto done;
+	}
+
+	switch (ctrl->id) {
+	case V4L2_CID_AUDIO_VOLUME:
+		ctrl->value = radio->registers[SYSCONFIG2] &
+				SYSCONFIG2_VOLUME;
+		break;
+	case V4L2_CID_AUDIO_MUTE:
+		ctrl->value = ((radio->registers[POWERCFG] &
+				POWERCFG_DMUTE) == 0) ? 1 : 0;
+		break;
+	default:
+		retval = -EINVAL;
+	}
+
+done:
+	if (retval < 0)
+		printk(KERN_WARNING DRIVER_NAME
+			": get control failed with %d\n", retval);
+	return retval;
+}
+
+
+/*
+ * si470x_vidioc_s_ctrl - set the value of a control
+ */
+static int si470x_vidioc_s_ctrl(struct file *file, void *priv,
+		struct v4l2_control *ctrl)
+{
+	struct si470x_device *radio = video_drvdata(file);
+	int retval = 0;
+
+	/* safety checks */
+	if (radio->disconnected) {
+		retval = -EIO;
+		goto done;
+	}
+
+	switch (ctrl->id) {
+	case V4L2_CID_AUDIO_VOLUME:
+		radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_VOLUME;
+		radio->registers[SYSCONFIG2] |= ctrl->value;
+		retval = si470x_set_register(radio, SYSCONFIG2);
+		break;
+	case V4L2_CID_AUDIO_MUTE:
+		if (ctrl->value == 1)
+			radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
+		else
+			radio->registers[POWERCFG] |= POWERCFG_DMUTE;
+		retval = si470x_set_register(radio, POWERCFG);
+		break;
+	default:
+		retval = -EINVAL;
+	}
+
+done:
+	if (retval < 0)
+		printk(KERN_WARNING DRIVER_NAME
+			": set control failed with %d\n", retval);
+	return retval;
+}
+
+
+/*
+ * si470x_vidioc_g_audio - get audio attributes
+ */
+static int si470x_vidioc_g_audio(struct file *file, void *priv,
+		struct v4l2_audio *audio)
+{
+	/* driver constants */
+	audio->index = 0;
+	strcpy(audio->name, "Radio");
+	audio->capability = V4L2_AUDCAP_STEREO;
+	audio->mode = 0;
+
+	return 0;
+}
+
+
+/*
+ * si470x_vidioc_g_tuner - get tuner attributes
+ */
+static int si470x_vidioc_g_tuner(struct file *file, void *priv,
+		struct v4l2_tuner *tuner)
+{
+	struct si470x_device *radio = video_drvdata(file);
+	int retval = 0;
+
+	/* safety checks */
+	if (radio->disconnected) {
+		retval = -EIO;
+		goto done;
+	}
+	if (tuner->index != 0) {
+		retval = -EINVAL;
+		goto done;
+	}
+
+	retval = si470x_get_register(radio, STATUSRSSI);
+	if (retval < 0)
+		goto done;
+
+	/* driver constants */
+	strcpy(tuner->name, "FM");
+	tuner->type = V4L2_TUNER_RADIO;
+	tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
+			    V4L2_TUNER_CAP_RDS;
+
+	/* range limits */
+	switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
+	/* 0: 87.5 - 108 MHz (USA, Europe, default) */
+	default:
+		tuner->rangelow  =  87.5 * FREQ_MUL;
+		tuner->rangehigh = 108   * FREQ_MUL;
+		break;
+	/* 1: 76   - 108 MHz (Japan wide band) */
+	case 1:
+		tuner->rangelow  =  76   * FREQ_MUL;
+		tuner->rangehigh = 108   * FREQ_MUL;
+		break;
+	/* 2: 76   -  90 MHz (Japan) */
+	case 2:
+		tuner->rangelow  =  76   * FREQ_MUL;
+		tuner->rangehigh =  90   * FREQ_MUL;
+		break;
+	};
+
+	/* stereo indicator == stereo (instead of mono) */
+	if ((radio->registers[STATUSRSSI] & STATUSRSSI_ST) == 0)
+		tuner->rxsubchans = V4L2_TUNER_SUB_MONO;
+	else
+		tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
+	/* If there is a reliable method of detecting an RDS channel,
+	   then this code should check for that before setting this
+	   RDS subchannel. */
+	tuner->rxsubchans |= V4L2_TUNER_SUB_RDS;
+
+	/* mono/stereo selector */
+	if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 0)
+		tuner->audmode = V4L2_TUNER_MODE_STEREO;
+	else
+		tuner->audmode = V4L2_TUNER_MODE_MONO;
+
+	/* min is worst, max is best; signal:0..0xffff; rssi: 0..0xff */
+	/* measured in units of db쨉V in 1 db increments (max at ~75 db쨉V) */
+	tuner->signal = (radio->registers[STATUSRSSI] & STATUSRSSI_RSSI);
+	/* the ideal factor is 0xffff/75 = 873,8 */
+	tuner->signal = (tuner->signal * 873) + (8 * tuner->signal / 10);
+
+	/* automatic frequency control: -1: freq to low, 1 freq to high */
+	/* AFCRL does only indicate that freq. differs, not if too low/high */
+	tuner->afc = (radio->registers[STATUSRSSI] & STATUSRSSI_AFCRL) ? 1 : 0;
+
+done:
+	if (retval < 0)
+		printk(KERN_WARNING DRIVER_NAME
+			": get tuner failed with %d\n", retval);
+	return retval;
+}
+
+
+/*
+ * si470x_vidioc_s_tuner - set tuner attributes
+ */
+static int si470x_vidioc_s_tuner(struct file *file, void *priv,
+		struct v4l2_tuner *tuner)
+{
+	struct si470x_device *radio = video_drvdata(file);
+	int retval = -EINVAL;
+
+	/* safety checks */
+	if (radio->disconnected) {
+		retval = -EIO;
+		goto done;
+	}
+	if (tuner->index != 0)
+		goto done;
+
+	/* mono/stereo selector */
+	switch (tuner->audmode) {
+	case V4L2_TUNER_MODE_MONO:
+		radio->registers[POWERCFG] |= POWERCFG_MONO;  /* force mono */
+		break;
+	case V4L2_TUNER_MODE_STEREO:
+		radio->registers[POWERCFG] &= ~POWERCFG_MONO; /* try stereo */
+		break;
+	default:
+		goto done;
+	}
+
+	retval = si470x_set_register(radio, POWERCFG);
+
+done:
+	if (retval < 0)
+		printk(KERN_WARNING DRIVER_NAME
+			": set tuner failed with %d\n", retval);
+	return retval;
+}
+
+
+/*
+ * si470x_vidioc_g_frequency - get tuner or modulator radio frequency
+ */
+static int si470x_vidioc_g_frequency(struct file *file, void *priv,
+		struct v4l2_frequency *freq)
+{
+	struct si470x_device *radio = video_drvdata(file);
+	int retval = 0;
+
+	/* safety checks */
+	if (radio->disconnected) {
+		retval = -EIO;
+		goto done;
+	}
+	if (freq->tuner != 0) {
+		retval = -EINVAL;
+		goto done;
+	}
+
+	freq->type = V4L2_TUNER_RADIO;
+	retval = si470x_get_freq(radio, &freq->frequency);
+
+done:
+	if (retval < 0)
+		printk(KERN_WARNING DRIVER_NAME
+			": get frequency failed with %d\n", retval);
+	return retval;
+}
+
+
+/*
+ * si470x_vidioc_s_frequency - set tuner or modulator radio frequency
+ */
+static int si470x_vidioc_s_frequency(struct file *file, void *priv,
+		struct v4l2_frequency *freq)
+{
+	struct si470x_device *radio = video_drvdata(file);
+	int retval = 0;
+
+	/* safety checks */
+	if (radio->disconnected) {
+		retval = -EIO;
+		goto done;
+	}
+	if (freq->tuner != 0) {
+		retval = -EINVAL;
+		goto done;
+	}
+
+	retval = si470x_set_freq(radio, freq->frequency);
+
+done:
+	if (retval < 0)
+		printk(KERN_WARNING DRIVER_NAME
+			": set frequency failed with %d\n", retval);
+	return retval;
+}
+
+
+/*
+ * si470x_vidioc_s_hw_freq_seek - set hardware frequency seek
+ */
+static int si470x_vidioc_s_hw_freq_seek(struct file *file, void *priv,
+		struct v4l2_hw_freq_seek *seek)
+{
+	struct si470x_device *radio = video_drvdata(file);
+	int retval = 0;
+
+	/* safety checks */
+	if (radio->disconnected) {
+		retval = -EIO;
+		goto done;
+	}
+	if (seek->tuner != 0) {
+		retval = -EINVAL;
+		goto done;
+	}
+
+	retval = si470x_set_seek(radio, seek->wrap_around, seek->seek_upward);
+
+done:
+	if (retval < 0)
+		printk(KERN_WARNING DRIVER_NAME
+			": set hardware frequency seek failed with %d\n",
+			retval);
+	return retval;
+}
+
+
+/*
+ * si470x_ioctl_ops - video device ioctl operations
+ */
+static const struct v4l2_ioctl_ops si470x_ioctl_ops = {
+	.vidioc_querycap	= si470x_vidioc_querycap,
+	.vidioc_queryctrl	= si470x_vidioc_queryctrl,
+	.vidioc_g_ctrl		= si470x_vidioc_g_ctrl,
+	.vidioc_s_ctrl		= si470x_vidioc_s_ctrl,
+	.vidioc_g_audio		= si470x_vidioc_g_audio,
+	.vidioc_g_tuner		= si470x_vidioc_g_tuner,
+	.vidioc_s_tuner		= si470x_vidioc_s_tuner,
+	.vidioc_g_frequency	= si470x_vidioc_g_frequency,
+	.vidioc_s_frequency	= si470x_vidioc_s_frequency,
+	.vidioc_s_hw_freq_seek	= si470x_vidioc_s_hw_freq_seek,
+};
+
+
+/*
+ * si470x_viddev_template - video device interface
+ */
+struct video_device si470x_viddev_template = {
+	.fops			= &si470x_fops,
+	.name			= DRIVER_NAME,
+	.release		= video_device_release,
+	.ioctl_ops		= &si470x_ioctl_ops,
+};