Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

6 files changed, 2472 insertions, 0 deletions

diff --git a/drivers/media/radio/si470x/Kconfig b/drivers/media/radio/si470x/Kconfig
new file mode 100644
index 000000000..9f7d35b04
--- /dev/null
+++ b/drivers/media/radio/si470x/Kconfig
@@ -0,0 +1,52 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config RADIO_SI470X
+	tristate "Silicon Labs Si470x FM Radio Receiver support"
+	depends on VIDEO_DEV
+	help
+	  This is a driver for devices with the Silicon Labs SI470x
+	  chip (either via USB or I2C buses).
+
+	  Say Y here if you want to connect this type of radio to your
+	  computer's USB port or if it is used by some other driver
+	  via I2C bus.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called radio-si470x-common.
+
+config USB_SI470X
+	tristate "Silicon Labs Si470x FM Radio Receiver support with USB"
+	depends on USB && RADIO_SI470X
+	help
+	  This is a driver for USB devices with the Silicon Labs SI470x
+	  chip. Currently these devices are known to work:
+	  - 10c4:818a: Silicon Labs USB FM Radio Reference Design
+	  - 06e1:a155: ADS/Tech FM Radio Receiver (formerly Instant FM Music)
+	  - 1b80:d700: KWorld USB FM Radio SnapMusic Mobile 700 (FM700)
+	  - 10c5:819a: Sanei Electric FM USB Radio (aka DealExtreme.com PCear)
+
+	  Sound is provided by the ALSA USB Audio/MIDI driver. Therefore
+	  if you don't want to use the device solely for RDS receiving,
+	  it is recommended to also select SND_USB_AUDIO.
+
+	  Please have a look at the documentation, especially on how
+	  to redirect the audio stream from the radio to your sound device:
+	  Documentation/admin-guide/media/si470x.rst
+
+	  Say Y here if you want to connect this type of radio to your
+	  computer's USB port.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called radio-usb-si470x.
+
+config I2C_SI470X
+	tristate "Silicon Labs Si470x FM Radio Receiver support with I2C"
+	depends on I2C && RADIO_SI470X
+	help
+	  This is a driver for I2C devices with the Silicon Labs SI470x
+	  chip.
+
+	  Say Y here if you want to connect this type of radio to your
+	  computer's I2C port.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called radio-i2c-si470x.
diff --git a/drivers/media/radio/si470x/Makefile b/drivers/media/radio/si470x/Makefile
new file mode 100644
index 000000000..e392126b0
--- /dev/null
+++ b/drivers/media/radio/si470x/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for radios with Silicon Labs Si470x FM Radio Receivers
+#
+
+obj-$(CONFIG_RADIO_SI470X) += radio-si470x-common.o
+obj-$(CONFIG_USB_SI470X) += radio-si470x-usb.o
+obj-$(CONFIG_I2C_SI470X) += radio-si470x-i2c.o
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 000000000..dc0c1d8d2
--- /dev/null
+++ b/drivers/media/radio/si470x/radio-si470x-common.c
@@ -0,0 +1,793 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  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>
+ *  Copyright (c) 2012 Hans de Goede <hdegoede@redhat.com>
+ */
+
+
+/*
+ * 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*");
+
+/* 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*");
+
+static const struct v4l2_frequency_band bands[] = {
+	{
+		.type = V4L2_TUNER_RADIO,
+		.index = 0,
+		.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
+			    V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
+			    V4L2_TUNER_CAP_FREQ_BANDS |
+			    V4L2_TUNER_CAP_HWSEEK_BOUNDED |
+			    V4L2_TUNER_CAP_HWSEEK_WRAP,
+		.rangelow   =  87500 * 16,
+		.rangehigh  = 108000 * 16,
+		.modulation = V4L2_BAND_MODULATION_FM,
+	},
+	{
+		.type = V4L2_TUNER_RADIO,
+		.index = 1,
+		.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
+			    V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
+			    V4L2_TUNER_CAP_FREQ_BANDS |
+			    V4L2_TUNER_CAP_HWSEEK_BOUNDED |
+			    V4L2_TUNER_CAP_HWSEEK_WRAP,
+		.rangelow   =  76000 * 16,
+		.rangehigh  = 108000 * 16,
+		.modulation = V4L2_BAND_MODULATION_FM,
+	},
+	{
+		.type = V4L2_TUNER_RADIO,
+		.index = 2,
+		.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
+			    V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
+			    V4L2_TUNER_CAP_FREQ_BANDS |
+			    V4L2_TUNER_CAP_HWSEEK_BOUNDED |
+			    V4L2_TUNER_CAP_HWSEEK_WRAP,
+		.rangelow   =  76000 * 16,
+		.rangehigh  =  90000 * 16,
+		.modulation = V4L2_BAND_MODULATION_FM,
+	},
+};
+
+/**************************************************************************
+ * Generic Functions
+ **************************************************************************/
+
+/*
+ * si470x_set_band - set the band
+ */
+static int si470x_set_band(struct si470x_device *radio, int band)
+{
+	if (radio->band == band)
+		return 0;
+
+	radio->band = band;
+	radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_BAND;
+	radio->registers[SYSCONFIG2] |= radio->band << 6;
+	return radio->set_register(radio, SYSCONFIG2);
+}
+
+/*
+ * si470x_set_chan - set the channel
+ */
+static int si470x_set_chan(struct si470x_device *radio, unsigned short chan)
+{
+	int retval;
+	unsigned long time_left;
+	bool timed_out = false;
+
+	retval = radio->get_register(radio, POWERCFG);
+	if (retval)
+		return retval;
+
+	if ((radio->registers[POWERCFG] & (POWERCFG_ENABLE|POWERCFG_DMUTE))
+		!= (POWERCFG_ENABLE|POWERCFG_DMUTE)) {
+		return 0;
+	}
+
+	/* start tuning */
+	radio->registers[CHANNEL] &= ~CHANNEL_CHAN;
+	radio->registers[CHANNEL] |= CHANNEL_TUNE | chan;
+	retval = radio->set_register(radio, CHANNEL);
+	if (retval < 0)
+		goto done;
+
+	/* wait till tune operation has completed */
+	reinit_completion(&radio->completion);
+	time_left = wait_for_completion_timeout(&radio->completion,
+						msecs_to_jiffies(tune_timeout));
+	if (time_left == 0)
+		timed_out = true;
+
+	if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
+		dev_warn(&radio->videodev.dev, "tune does not complete\n");
+	if (timed_out)
+		dev_warn(&radio->videodev.dev,
+			"tune timed out after %u ms\n", tune_timeout);
+
+	/* stop tuning */
+	radio->registers[CHANNEL] &= ~CHANNEL_TUNE;
+	retval = radio->set_register(radio, CHANNEL);
+
+done:
+	return retval;
+}
+
+/*
+ * si470x_get_step - get channel spacing
+ */
+static unsigned int si470x_get_step(struct si470x_device *radio)
+{
+	/* Spacing (kHz) */
+	switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) {
+	/* 0: 200 kHz (USA, Australia) */
+	case 0:
+		return 200 * 16;
+	/* 1: 100 kHz (Europe, Japan) */
+	case 1:
+		return 100 * 16;
+	/* 2:  50 kHz */
+	default:
+		return 50 * 16;
+	}
+}
+
+
+/*
+ * si470x_get_freq - get the frequency
+ */
+static int si470x_get_freq(struct si470x_device *radio, unsigned int *freq)
+{
+	int chan, retval;
+
+	/* read channel */
+	retval = radio->get_register(radio, READCHAN);
+	chan = radio->registers[READCHAN] & READCHAN_READCHAN;
+
+	/* Frequency (MHz) = Spacing (kHz) x Channel + Bottom of Band (MHz) */
+	*freq = chan * si470x_get_step(radio) + bands[radio->band].rangelow;
+
+	return retval;
+}
+
+
+/*
+ * si470x_set_freq - set the frequency
+ */
+int si470x_set_freq(struct si470x_device *radio, unsigned int freq)
+{
+	unsigned short chan;
+
+	freq = clamp(freq, bands[radio->band].rangelow,
+			   bands[radio->band].rangehigh);
+	/* Chan = [ Freq (Mhz) - Bottom of Band (MHz) ] / Spacing (kHz) */
+	chan = (freq - bands[radio->band].rangelow) / si470x_get_step(radio);
+
+	return si470x_set_chan(radio, chan);
+}
+EXPORT_SYMBOL_GPL(si470x_set_freq);
+
+
+/*
+ * si470x_set_seek - set seek
+ */
+static int si470x_set_seek(struct si470x_device *radio,
+			   const struct v4l2_hw_freq_seek *seek)
+{
+	int band, retval;
+	unsigned int freq;
+	bool timed_out = false;
+	unsigned long time_left;
+
+	/* set band */
+	if (seek->rangelow || seek->rangehigh) {
+		for (band = 0; band < ARRAY_SIZE(bands); band++) {
+			if (bands[band].rangelow  == seek->rangelow &&
+			    bands[band].rangehigh == seek->rangehigh)
+				break;
+		}
+		if (band == ARRAY_SIZE(bands))
+			return -EINVAL; /* No matching band found */
+	} else
+		band = 1; /* If nothing is specified seek 76 - 108 Mhz */
+
+	if (radio->band != band) {
+		retval = si470x_get_freq(radio, &freq);
+		if (retval)
+			return retval;
+		retval = si470x_set_band(radio, band);
+		if (retval)
+			return retval;
+		retval = si470x_set_freq(radio, freq);
+		if (retval)
+			return retval;
+	}
+
+	/* start seeking */
+	radio->registers[POWERCFG] |= POWERCFG_SEEK;
+	if (seek->wrap_around)
+		radio->registers[POWERCFG] &= ~POWERCFG_SKMODE;
+	else
+		radio->registers[POWERCFG] |= POWERCFG_SKMODE;
+	if (seek->seek_upward)
+		radio->registers[POWERCFG] |= POWERCFG_SEEKUP;
+	else
+		radio->registers[POWERCFG] &= ~POWERCFG_SEEKUP;
+	retval = radio->set_register(radio, POWERCFG);
+	if (retval < 0)
+		return retval;
+
+	/* wait till tune operation has completed */
+	reinit_completion(&radio->completion);
+	time_left = wait_for_completion_timeout(&radio->completion,
+						msecs_to_jiffies(seek_timeout));
+	if (time_left == 0)
+		timed_out = true;
+
+	if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
+		dev_warn(&radio->videodev.dev, "seek does not complete\n");
+	if (radio->registers[STATUSRSSI] & STATUSRSSI_SF)
+		dev_warn(&radio->videodev.dev,
+			"seek failed / band limit reached\n");
+
+	/* stop seeking */
+	radio->registers[POWERCFG] &= ~POWERCFG_SEEK;
+	retval = radio->set_register(radio, POWERCFG);
+
+	/* try again, if timed out */
+	if (retval == 0 && timed_out)
+		return -ENODATA;
+	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 = radio->set_register(radio, POWERCFG);
+	if (retval < 0)
+		goto done;
+
+	/* sysconfig 1 */
+	radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDSIEN | SYSCONFIG1_STCIEN |
+					SYSCONFIG1_RDS;
+	radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_GPIO2;
+	radio->registers[SYSCONFIG1] |= SYSCONFIG1_GPIO2_INT;
+	if (de)
+		radio->registers[SYSCONFIG1] |= SYSCONFIG1_DE;
+	retval = radio->set_register(radio, SYSCONFIG1);
+	if (retval < 0)
+		goto done;
+
+	/* sysconfig 2 */
+	radio->registers[SYSCONFIG2] =
+		(0x1f  << 8) |				/* SEEKTH */
+		((radio->band << 6) & SYSCONFIG2_BAND) |/* BAND */
+		((space << 4) & SYSCONFIG2_SPACE) |	/* SPACE */
+		15;					/* VOLUME (max) */
+	retval = radio->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;
+}
+EXPORT_SYMBOL_GPL(si470x_start);
+
+
+/*
+ * si470x_stop - switch off radio
+ */
+int si470x_stop(struct si470x_device *radio)
+{
+	int retval;
+
+	/* sysconfig 1 */
+	radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
+	retval = radio->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 = radio->set_register(radio, POWERCFG);
+
+done:
+	return retval;
+}
+EXPORT_SYMBOL_GPL(si470x_stop);
+
+
+/*
+ * si470x_rds_on - switch on rds reception
+ */
+static int si470x_rds_on(struct si470x_device *radio)
+{
+	int retval;
+
+	/* sysconfig 1 */
+	radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDS;
+	retval = radio->set_register(radio, SYSCONFIG1);
+	if (retval < 0)
+		radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
+
+	return retval;
+}
+
+
+
+/**************************************************************************
+ * File Operations Interface
+ **************************************************************************/
+
+/*
+ * si470x_fops_read - read RDS data
+ */
+static ssize_t si470x_fops_read(struct file *file, char __user *buf,
+		size_t count, loff_t *ppos)
+{
+	struct si470x_device *radio = video_drvdata(file);
+	int retval = 0;
+	unsigned int block_count = 0;
+
+	/* switch on rds reception */
+	if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
+		si470x_rds_on(radio);
+
+	/* block if no new data available */
+	while (radio->wr_index == radio->rd_index) {
+		if (file->f_flags & O_NONBLOCK) {
+			retval = -EWOULDBLOCK;
+			goto done;
+		}
+		if (wait_event_interruptible(radio->read_queue,
+			radio->wr_index != radio->rd_index) < 0) {
+			retval = -EINTR;
+			goto done;
+		}
+	}
+
+	/* calculate block count from byte count */
+	count /= 3;
+
+	/* copy RDS block out of internal buffer and to user buffer */
+	while (block_count < count) {
+		if (radio->rd_index == radio->wr_index)
+			break;
+
+		/* always transfer rds complete blocks */
+		if (copy_to_user(buf, &radio->buffer[radio->rd_index], 3))
+			/* retval = -EFAULT; */
+			break;
+
+		/* increment and wrap read pointer */
+		radio->rd_index += 3;
+		if (radio->rd_index >= radio->buf_size)
+			radio->rd_index = 0;
+
+		/* increment counters */
+		block_count++;
+		buf += 3;
+		retval += 3;
+	}
+
+done:
+	return retval;
+}
+
+
+/*
+ * si470x_fops_poll - poll RDS data
+ */
+static __poll_t si470x_fops_poll(struct file *file,
+		struct poll_table_struct *pts)
+{
+	struct si470x_device *radio = video_drvdata(file);
+	__poll_t req_events = poll_requested_events(pts);
+	__poll_t retval = v4l2_ctrl_poll(file, pts);
+
+	if (req_events & (EPOLLIN | EPOLLRDNORM)) {
+		/* switch on rds reception */
+		if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
+			si470x_rds_on(radio);
+
+		poll_wait(file, &radio->read_queue, pts);
+
+		if (radio->rd_index != radio->wr_index)
+			retval |= EPOLLIN | EPOLLRDNORM;
+	}
+
+	return retval;
+}
+
+
+static int si470x_fops_open(struct file *file)
+{
+	struct si470x_device *radio = video_drvdata(file);
+
+	return radio->fops_open(file);
+}
+
+
+/*
+ * si470x_fops_release - file release
+ */
+static int si470x_fops_release(struct file *file)
+{
+	struct si470x_device *radio = video_drvdata(file);
+
+	return radio->fops_release(file);
+}
+
+
+/*
+ * si470x_fops - file operations interface
+ */
+static const struct v4l2_file_operations si470x_fops = {
+	.owner			= THIS_MODULE,
+	.read			= si470x_fops_read,
+	.poll			= si470x_fops_poll,
+	.unlocked_ioctl		= video_ioctl2,
+	.open			= si470x_fops_open,
+	.release		= si470x_fops_release,
+};
+
+
+
+/**************************************************************************
+ * Video4Linux Interface
+ **************************************************************************/
+
+
+static int si470x_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct si470x_device *radio =
+		container_of(ctrl->handler, struct si470x_device, hdl);
+
+	switch (ctrl->id) {
+	case V4L2_CID_AUDIO_VOLUME:
+		radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_VOLUME;
+		radio->registers[SYSCONFIG2] |= ctrl->val;
+		return radio->set_register(radio, SYSCONFIG2);
+	case V4L2_CID_AUDIO_MUTE:
+		if (ctrl->val)
+			radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
+		else
+			radio->registers[POWERCFG] |= POWERCFG_DMUTE;
+		return radio->set_register(radio, POWERCFG);
+	default:
+		return -EINVAL;
+	}
+}
+
+
+/*
+ * 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;
+
+	if (tuner->index != 0)
+		return -EINVAL;
+
+	if (!radio->status_rssi_auto_update) {
+		retval = radio->get_register(radio, STATUSRSSI);
+		if (retval < 0)
+			return retval;
+	}
+
+	/* driver constants */
+	strscpy(tuner->name, "FM", sizeof(tuner->name));
+	tuner->type = V4L2_TUNER_RADIO;
+	tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
+			    V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
+			    V4L2_TUNER_CAP_HWSEEK_BOUNDED |
+			    V4L2_TUNER_CAP_HWSEEK_WRAP;
+	tuner->rangelow  =  76 * FREQ_MUL;
+	tuner->rangehigh = 108 * FREQ_MUL;
+
+	/* 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_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 dbµV in 1 db increments (max at ~75 dbµV) */
+	tuner->signal = (radio->registers[STATUSRSSI] & STATUSRSSI_RSSI);
+	/* the ideal factor is 0xffff/75 = 873,8 */
+	tuner->signal = (tuner->signal * 873) + (8 * tuner->signal / 10);
+	if (tuner->signal > 0xffff)
+		tuner->signal = 0xffff;
+
+	/* 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;
+
+	return retval;
+}
+
+
+/*
+ * si470x_vidioc_s_tuner - set tuner attributes
+ */
+static int si470x_vidioc_s_tuner(struct file *file, void *priv,
+		const struct v4l2_tuner *tuner)
+{
+	struct si470x_device *radio = video_drvdata(file);
+
+	if (tuner->index != 0)
+		return -EINVAL;
+
+	/* mono/stereo selector */
+	switch (tuner->audmode) {
+	case V4L2_TUNER_MODE_MONO:
+		radio->registers[POWERCFG] |= POWERCFG_MONO;  /* force mono */
+		break;
+	case V4L2_TUNER_MODE_STEREO:
+	default:
+		radio->registers[POWERCFG] &= ~POWERCFG_MONO; /* try stereo */
+		break;
+	}
+
+	return radio->set_register(radio, POWERCFG);
+}
+
+
+/*
+ * 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);
+
+	if (freq->tuner != 0)
+		return -EINVAL;
+
+	freq->type = V4L2_TUNER_RADIO;
+	return si470x_get_freq(radio, &freq->frequency);
+}
+
+
+/*
+ * si470x_vidioc_s_frequency - set tuner or modulator radio frequency
+ */
+static int si470x_vidioc_s_frequency(struct file *file, void *priv,
+		const struct v4l2_frequency *freq)
+{
+	struct si470x_device *radio = video_drvdata(file);
+	int retval;
+
+	if (freq->tuner != 0)
+		return -EINVAL;
+
+	if (freq->frequency < bands[radio->band].rangelow ||
+	    freq->frequency > bands[radio->band].rangehigh) {
+		/* Switch to band 1 which covers everything we support */
+		retval = si470x_set_band(radio, 1);
+		if (retval)
+			return retval;
+	}
+	return si470x_set_freq(radio, freq->frequency);
+}
+
+
+/*
+ * si470x_vidioc_s_hw_freq_seek - set hardware frequency seek
+ */
+static int si470x_vidioc_s_hw_freq_seek(struct file *file, void *priv,
+		const struct v4l2_hw_freq_seek *seek)
+{
+	struct si470x_device *radio = video_drvdata(file);
+
+	if (seek->tuner != 0)
+		return -EINVAL;
+
+	if (file->f_flags & O_NONBLOCK)
+		return -EWOULDBLOCK;
+
+	return si470x_set_seek(radio, seek);
+}
+
+/*
+ * si470x_vidioc_enum_freq_bands - enumerate supported bands
+ */
+static int si470x_vidioc_enum_freq_bands(struct file *file, void *priv,
+					 struct v4l2_frequency_band *band)
+{
+	if (band->tuner != 0)
+		return -EINVAL;
+	if (band->index >= ARRAY_SIZE(bands))
+		return -EINVAL;
+	*band = bands[band->index];
+	return 0;
+}
+
+const struct v4l2_ctrl_ops si470x_ctrl_ops = {
+	.s_ctrl = si470x_s_ctrl,
+};
+EXPORT_SYMBOL_GPL(si470x_ctrl_ops);
+
+static int si470x_vidioc_querycap(struct file *file, void *priv,
+		struct v4l2_capability *capability)
+{
+	struct si470x_device *radio = video_drvdata(file);
+
+	return radio->vidioc_querycap(file, priv, capability);
+};
+
+/*
+ * si470x_ioctl_ops - video device ioctl operations
+ */
+static const struct v4l2_ioctl_ops si470x_ioctl_ops = {
+	.vidioc_querycap	= si470x_vidioc_querycap,
+	.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,
+	.vidioc_enum_freq_bands = si470x_vidioc_enum_freq_bands,
+	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
+	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+};
+
+
+/*
+ * si470x_viddev_template - video device interface
+ */
+const struct video_device si470x_viddev_template = {
+	.fops			= &si470x_fops,
+	.name			= DRIVER_NAME,
+	.release		= video_device_release_empty,
+	.ioctl_ops		= &si470x_ioctl_ops,
+};
+EXPORT_SYMBOL_GPL(si470x_viddev_template);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/media/radio/si470x/radio-si470x-i2c.c b/drivers/media/radio/si470x/radio-si470x-i2c.c
new file mode 100644
index 000000000..a6ad926c2
--- /dev/null
+++ b/drivers/media/radio/si470x/radio-si470x-i2c.c
@@ -0,0 +1,545 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * drivers/media/radio/si470x/radio-si470x-i2c.c
+ *
+ * I2C driver for radios with Silicon Labs Si470x FM Radio Receivers
+ *
+ * Copyright (c) 2009 Samsung Electronics Co.Ltd
+ * Author: Joonyoung Shim <jy0922.shim@samsung.com>
+ */
+
+
+/* driver definitions */
+#define DRIVER_AUTHOR "Joonyoung Shim <jy0922.shim@samsung.com>";
+#define DRIVER_CARD "Silicon Labs Si470x FM Radio"
+#define DRIVER_DESC "I2C radio driver for Si470x FM Radio Receivers"
+#define DRIVER_VERSION "1.0.2"
+
+/* kernel includes */
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+
+#include "radio-si470x.h"
+
+
+/* I2C Device ID List */
+static const struct i2c_device_id si470x_i2c_id[] = {
+	/* Generic Entry */
+	{ "si470x", 0 },
+	/* Terminating entry */
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, si470x_i2c_id);
+
+
+/**************************************************************************
+ * Module Parameters
+ **************************************************************************/
+
+/* Radio Nr */
+static int radio_nr = -1;
+module_param(radio_nr, int, 0444);
+MODULE_PARM_DESC(radio_nr, "Radio Nr");
+
+/* RDS buffer blocks */
+static unsigned int rds_buf = 100;
+module_param(rds_buf, uint, 0444);
+MODULE_PARM_DESC(rds_buf, "RDS buffer entries: *100*");
+
+/* RDS maximum block errors */
+static unsigned short max_rds_errors = 1;
+/* 0 means   0  errors requiring correction */
+/* 1 means 1-2  errors requiring correction (used by original USBRadio.exe) */
+/* 2 means 3-5  errors requiring correction */
+/* 3 means   6+ errors or errors in checkword, correction not possible */
+module_param(max_rds_errors, ushort, 0644);
+MODULE_PARM_DESC(max_rds_errors, "RDS maximum block errors: *1*");
+
+
+
+/**************************************************************************
+ * I2C Definitions
+ **************************************************************************/
+
+/* Write starts with the upper byte of register 0x02 */
+#define WRITE_REG_NUM		8
+#define WRITE_INDEX(i)		(i + 0x02)
+
+/* Read starts with the upper byte of register 0x0a */
+#define READ_REG_NUM		RADIO_REGISTER_NUM
+#define READ_INDEX(i)		((i + RADIO_REGISTER_NUM - 0x0a) % READ_REG_NUM)
+
+
+
+/**************************************************************************
+ * General Driver Functions - REGISTERs
+ **************************************************************************/
+
+/*
+ * si470x_get_register - read register
+ */
+static int si470x_get_register(struct si470x_device *radio, int regnr)
+{
+	__be16 buf[READ_REG_NUM];
+	struct i2c_msg msgs[1] = {
+		{
+			.addr = radio->client->addr,
+			.flags = I2C_M_RD,
+			.len = sizeof(u16) * READ_REG_NUM,
+			.buf = (void *)buf
+		},
+	};
+
+	if (i2c_transfer(radio->client->adapter, msgs, 1) != 1)
+		return -EIO;
+
+	radio->registers[regnr] = __be16_to_cpu(buf[READ_INDEX(regnr)]);
+
+	return 0;
+}
+
+
+/*
+ * si470x_set_register - write register
+ */
+static int si470x_set_register(struct si470x_device *radio, int regnr)
+{
+	int i;
+	__be16 buf[WRITE_REG_NUM];
+	struct i2c_msg msgs[1] = {
+		{
+			.addr = radio->client->addr,
+			.len = sizeof(u16) * WRITE_REG_NUM,
+			.buf = (void *)buf
+		},
+	};
+
+	for (i = 0; i < WRITE_REG_NUM; i++)
+		buf[i] = __cpu_to_be16(radio->registers[WRITE_INDEX(i)]);
+
+	if (i2c_transfer(radio->client->adapter, msgs, 1) != 1)
+		return -EIO;
+
+	return 0;
+}
+
+
+
+/**************************************************************************
+ * General Driver Functions - ENTIRE REGISTERS
+ **************************************************************************/
+
+/*
+ * si470x_get_all_registers - read entire registers
+ */
+static int si470x_get_all_registers(struct si470x_device *radio)
+{
+	int i;
+	__be16 buf[READ_REG_NUM];
+	struct i2c_msg msgs[1] = {
+		{
+			.addr = radio->client->addr,
+			.flags = I2C_M_RD,
+			.len = sizeof(u16) * READ_REG_NUM,
+			.buf = (void *)buf
+		},
+	};
+
+	if (i2c_transfer(radio->client->adapter, msgs, 1) != 1)
+		return -EIO;
+
+	for (i = 0; i < READ_REG_NUM; i++)
+		radio->registers[i] = __be16_to_cpu(buf[READ_INDEX(i)]);
+
+	return 0;
+}
+
+
+
+/**************************************************************************
+ * File Operations Interface
+ **************************************************************************/
+
+/*
+ * si470x_fops_open - file open
+ */
+static int si470x_fops_open(struct file *file)
+{
+	struct si470x_device *radio = video_drvdata(file);
+	int retval = v4l2_fh_open(file);
+
+	if (retval)
+		return retval;
+
+	if (v4l2_fh_is_singular_file(file)) {
+		/* start radio */
+		retval = si470x_start(radio);
+		if (retval < 0)
+			goto done;
+
+		/* enable RDS / STC interrupt */
+		radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDSIEN;
+		radio->registers[SYSCONFIG1] |= SYSCONFIG1_STCIEN;
+		radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_GPIO2;
+		radio->registers[SYSCONFIG1] |= 0x1 << 2;
+		retval = si470x_set_register(radio, SYSCONFIG1);
+	}
+
+done:
+	if (retval)
+		v4l2_fh_release(file);
+	return retval;
+}
+
+
+/*
+ * si470x_fops_release - file release
+ */
+static int si470x_fops_release(struct file *file)
+{
+	struct si470x_device *radio = video_drvdata(file);
+
+	if (v4l2_fh_is_singular_file(file))
+		/* stop radio */
+		si470x_stop(radio);
+
+	return v4l2_fh_release(file);
+}
+
+
+
+/**************************************************************************
+ * Video4Linux Interface
+ **************************************************************************/
+
+/*
+ * si470x_vidioc_querycap - query device capabilities
+ */
+static int si470x_vidioc_querycap(struct file *file, void *priv,
+				  struct v4l2_capability *capability)
+{
+	strscpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
+	strscpy(capability->card, DRIVER_CARD, sizeof(capability->card));
+	return 0;
+}
+
+
+
+/**************************************************************************
+ * I2C Interface
+ **************************************************************************/
+
+/*
+ * si470x_i2c_interrupt - interrupt handler
+ */
+static irqreturn_t si470x_i2c_interrupt(int irq, void *dev_id)
+{
+	struct si470x_device *radio = dev_id;
+	unsigned char regnr;
+	unsigned char blocknum;
+	unsigned short bler; /* rds block errors */
+	unsigned short rds;
+	unsigned char tmpbuf[3];
+	int retval = 0;
+
+	/* check Seek/Tune Complete */
+	retval = si470x_get_register(radio, STATUSRSSI);
+	if (retval < 0)
+		goto end;
+
+	if (radio->registers[STATUSRSSI] & STATUSRSSI_STC)
+		complete(&radio->completion);
+
+	/* safety checks */
+	if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
+		goto end;
+
+	/* Update RDS registers */
+	for (regnr = 1; regnr < RDS_REGISTER_NUM; regnr++) {
+		retval = si470x_get_register(radio, STATUSRSSI + regnr);
+		if (retval < 0)
+			goto end;
+	}
+
+	/* get rds blocks */
+	if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0)
+		/* No RDS group ready, better luck next time */
+		goto end;
+
+	for (blocknum = 0; blocknum < 4; blocknum++) {
+		switch (blocknum) {
+		default:
+			bler = (radio->registers[STATUSRSSI] &
+					STATUSRSSI_BLERA) >> 9;
+			rds = radio->registers[RDSA];
+			break;
+		case 1:
+			bler = (radio->registers[READCHAN] &
+					READCHAN_BLERB) >> 14;
+			rds = radio->registers[RDSB];
+			break;
+		case 2:
+			bler = (radio->registers[READCHAN] &
+					READCHAN_BLERC) >> 12;
+			rds = radio->registers[RDSC];
+			break;
+		case 3:
+			bler = (radio->registers[READCHAN] &
+					READCHAN_BLERD) >> 10;
+			rds = radio->registers[RDSD];
+			break;
+		}
+
+		/* Fill the V4L2 RDS buffer */
+		put_unaligned_le16(rds, &tmpbuf);
+		tmpbuf[2] = blocknum;		/* offset name */
+		tmpbuf[2] |= blocknum << 3;	/* received offset */
+		if (bler > max_rds_errors)
+			tmpbuf[2] |= 0x80;	/* uncorrectable errors */
+		else if (bler > 0)
+			tmpbuf[2] |= 0x40;	/* corrected error(s) */
+
+		/* copy RDS block to internal buffer */
+		memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
+		radio->wr_index += 3;
+
+		/* wrap write pointer */
+		if (radio->wr_index >= radio->buf_size)
+			radio->wr_index = 0;
+
+		/* check for overflow */
+		if (radio->wr_index == radio->rd_index) {
+			/* increment and wrap read pointer */
+			radio->rd_index += 3;
+			if (radio->rd_index >= radio->buf_size)
+				radio->rd_index = 0;
+		}
+	}
+
+	if (radio->wr_index != radio->rd_index)
+		wake_up_interruptible(&radio->read_queue);
+
+end:
+	return IRQ_HANDLED;
+}
+
+
+/*
+ * si470x_i2c_probe - probe for the device
+ */
+static int si470x_i2c_probe(struct i2c_client *client)
+{
+	struct si470x_device *radio;
+	int retval = 0;
+
+	/* private data allocation and initialization */
+	radio = devm_kzalloc(&client->dev, sizeof(*radio), GFP_KERNEL);
+	if (!radio) {
+		retval = -ENOMEM;
+		goto err_initial;
+	}
+
+	radio->client = client;
+	radio->band = 1; /* Default to 76 - 108 MHz */
+	mutex_init(&radio->lock);
+	init_completion(&radio->completion);
+
+	radio->get_register = si470x_get_register;
+	radio->set_register = si470x_set_register;
+	radio->fops_open = si470x_fops_open;
+	radio->fops_release = si470x_fops_release;
+	radio->vidioc_querycap = si470x_vidioc_querycap;
+
+	retval = v4l2_device_register(&client->dev, &radio->v4l2_dev);
+	if (retval < 0) {
+		dev_err(&client->dev, "couldn't register v4l2_device\n");
+		goto err_initial;
+	}
+
+	v4l2_ctrl_handler_init(&radio->hdl, 2);
+	v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
+			V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
+	v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
+			V4L2_CID_AUDIO_VOLUME, 0, 15, 1, 15);
+	if (radio->hdl.error) {
+		retval = radio->hdl.error;
+		dev_err(&client->dev, "couldn't register control\n");
+		goto err_all;
+	}
+
+	/* video device initialization */
+	radio->videodev = si470x_viddev_template;
+	radio->videodev.ctrl_handler = &radio->hdl;
+	radio->videodev.lock = &radio->lock;
+	radio->videodev.v4l2_dev = &radio->v4l2_dev;
+	radio->videodev.release = video_device_release_empty;
+	radio->videodev.device_caps =
+		V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_READWRITE | V4L2_CAP_TUNER |
+		V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
+	video_set_drvdata(&radio->videodev, radio);
+
+	radio->gpio_reset = devm_gpiod_get_optional(&client->dev, "reset",
+						    GPIOD_OUT_LOW);
+	if (IS_ERR(radio->gpio_reset)) {
+		retval = PTR_ERR(radio->gpio_reset);
+		dev_err(&client->dev, "Failed to request gpio: %d\n", retval);
+		goto err_all;
+	}
+
+	if (radio->gpio_reset)
+		gpiod_set_value(radio->gpio_reset, 1);
+
+	/* power up : need 110ms */
+	radio->registers[POWERCFG] = POWERCFG_ENABLE;
+	if (si470x_set_register(radio, POWERCFG) < 0) {
+		retval = -EIO;
+		goto err_all;
+	}
+	msleep(110);
+
+	/* get device and chip versions */
+	if (si470x_get_all_registers(radio) < 0) {
+		retval = -EIO;
+		goto err_all;
+	}
+	dev_info(&client->dev, "DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
+			radio->registers[DEVICEID], radio->registers[SI_CHIPID]);
+	if ((radio->registers[SI_CHIPID] & SI_CHIPID_FIRMWARE) < RADIO_FW_VERSION) {
+		dev_warn(&client->dev,
+			"This driver is known to work with firmware version %u, but the device has firmware version %u.\n"
+			"If you have some trouble using this driver, please report to V4L ML at linux-media@vger.kernel.org\n",
+			RADIO_FW_VERSION,
+			radio->registers[SI_CHIPID] & SI_CHIPID_FIRMWARE);
+	}
+
+	/* set initial frequency */
+	si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
+
+	/* rds buffer allocation */
+	radio->buf_size = rds_buf * 3;
+	radio->buffer = devm_kmalloc(&client->dev, radio->buf_size, GFP_KERNEL);
+	if (!radio->buffer) {
+		retval = -EIO;
+		goto err_all;
+	}
+
+	/* rds buffer configuration */
+	radio->wr_index = 0;
+	radio->rd_index = 0;
+	init_waitqueue_head(&radio->read_queue);
+
+	retval = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+					   si470x_i2c_interrupt,
+					   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					   DRIVER_NAME, radio);
+	if (retval) {
+		dev_err(&client->dev, "Failed to register interrupt\n");
+		goto err_all;
+	}
+
+	/* register video device */
+	retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO,
+			radio_nr);
+	if (retval) {
+		dev_warn(&client->dev, "Could not register video device\n");
+		goto err_all;
+	}
+	i2c_set_clientdata(client, radio);
+
+	return 0;
+err_all:
+	v4l2_ctrl_handler_free(&radio->hdl);
+	v4l2_device_unregister(&radio->v4l2_dev);
+err_initial:
+	return retval;
+}
+
+
+/*
+ * si470x_i2c_remove - remove the device
+ */
+static void si470x_i2c_remove(struct i2c_client *client)
+{
+	struct si470x_device *radio = i2c_get_clientdata(client);
+
+	video_unregister_device(&radio->videodev);
+
+	if (radio->gpio_reset)
+		gpiod_set_value(radio->gpio_reset, 0);
+
+	v4l2_ctrl_handler_free(&radio->hdl);
+	v4l2_device_unregister(&radio->v4l2_dev);
+}
+
+
+#ifdef CONFIG_PM_SLEEP
+/*
+ * si470x_i2c_suspend - suspend the device
+ */
+static int si470x_i2c_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct si470x_device *radio = i2c_get_clientdata(client);
+
+	/* power down */
+	radio->registers[POWERCFG] |= POWERCFG_DISABLE;
+	if (si470x_set_register(radio, POWERCFG) < 0)
+		return -EIO;
+
+	return 0;
+}
+
+
+/*
+ * si470x_i2c_resume - resume the device
+ */
+static int si470x_i2c_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct si470x_device *radio = i2c_get_clientdata(client);
+
+	/* power up : need 110ms */
+	radio->registers[POWERCFG] |= POWERCFG_ENABLE;
+	if (si470x_set_register(radio, POWERCFG) < 0)
+		return -EIO;
+	msleep(110);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(si470x_i2c_pm, si470x_i2c_suspend, si470x_i2c_resume);
+#endif
+
+#if IS_ENABLED(CONFIG_OF)
+static const struct of_device_id si470x_of_match[] = {
+	{ .compatible = "silabs,si470x" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, si470x_of_match);
+#endif
+
+/*
+ * si470x_i2c_driver - i2c driver interface
+ */
+static struct i2c_driver si470x_i2c_driver = {
+	.driver = {
+		.name		= "si470x",
+		.of_match_table = of_match_ptr(si470x_of_match),
+#ifdef CONFIG_PM_SLEEP
+		.pm		= &si470x_i2c_pm,
+#endif
+	},
+	.probe_new		= si470x_i2c_probe,
+	.remove			= si470x_i2c_remove,
+	.id_table		= si470x_i2c_id,
+};
+
+module_i2c_driver(si470x_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_VERSION(DRIVER_VERSION);
diff --git a/drivers/media/radio/si470x/radio-si470x-usb.c b/drivers/media/radio/si470x/radio-si470x-usb.c
new file mode 100644
index 000000000..aa7a580db
--- /dev/null
+++ b/drivers/media/radio/si470x/radio-si470x-usb.c
@@ -0,0 +1,854 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  drivers/media/radio/si470x/radio-si470x-usb.c
+ *
+ *  USB driver for radios with Silicon Labs Si470x FM Radio Receivers
+ *
+ *  Copyright (c) 2009 Tobias Lorenz <tobias.lorenz@gmx.net>
+ */
+
+
+/*
+ * ToDo:
+ * - add firmware download/update support
+ */
+
+
+/* driver definitions */
+#define DRIVER_AUTHOR "Tobias Lorenz <tobias.lorenz@gmx.net>"
+#define DRIVER_CARD "Silicon Labs Si470x FM Radio"
+#define DRIVER_DESC "USB radio driver for Si470x FM Radio Receivers"
+#define DRIVER_VERSION "1.0.10"
+
+/* kernel includes */
+#include <linux/usb.h>
+#include <linux/hid.h>
+#include <linux/slab.h>
+
+#include "radio-si470x.h"
+
+
+/* USB Device ID List */
+static const struct usb_device_id si470x_usb_driver_id_table[] = {
+	/* Silicon Labs USB FM Radio Reference Design */
+	{ USB_DEVICE_AND_INTERFACE_INFO(0x10c4, 0x818a, USB_CLASS_HID, 0, 0) },
+	/* ADS/Tech FM Radio Receiver (formerly Instant FM Music) */
+	{ USB_DEVICE_AND_INTERFACE_INFO(0x06e1, 0xa155, USB_CLASS_HID, 0, 0) },
+	/* KWorld USB FM Radio SnapMusic Mobile 700 (FM700) */
+	{ USB_DEVICE_AND_INTERFACE_INFO(0x1b80, 0xd700, USB_CLASS_HID, 0, 0) },
+	/* Sanei Electric, Inc. FM USB Radio (sold as DealExtreme.com PCear) */
+	{ USB_DEVICE_AND_INTERFACE_INFO(0x10c5, 0x819a, USB_CLASS_HID, 0, 0) },
+	/* Axentia ALERT FM USB Receiver */
+	{ USB_DEVICE_AND_INTERFACE_INFO(0x12cf, 0x7111, USB_CLASS_HID, 0, 0) },
+	/* Terminating entry */
+	{ }
+};
+MODULE_DEVICE_TABLE(usb, si470x_usb_driver_id_table);
+
+
+
+/**************************************************************************
+ * Module Parameters
+ **************************************************************************/
+
+/* Radio Nr */
+static int radio_nr = -1;
+module_param(radio_nr, int, 0444);
+MODULE_PARM_DESC(radio_nr, "Radio Nr");
+
+/* USB timeout */
+static unsigned int usb_timeout = 500;
+module_param(usb_timeout, uint, 0644);
+MODULE_PARM_DESC(usb_timeout, "USB timeout (ms): *500*");
+
+/* RDS buffer blocks */
+static unsigned int rds_buf = 100;
+module_param(rds_buf, uint, 0444);
+MODULE_PARM_DESC(rds_buf, "RDS buffer entries: *100*");
+
+/* RDS maximum block errors */
+static unsigned short max_rds_errors = 1;
+/* 0 means   0  errors requiring correction */
+/* 1 means 1-2  errors requiring correction (used by original USBRadio.exe) */
+/* 2 means 3-5  errors requiring correction */
+/* 3 means   6+ errors or errors in checkword, correction not possible */
+module_param(max_rds_errors, ushort, 0644);
+MODULE_PARM_DESC(max_rds_errors, "RDS maximum block errors: *1*");
+
+
+
+/**************************************************************************
+ * USB HID Reports
+ **************************************************************************/
+
+/* Reports 1-16 give direct read/write access to the 16 Si470x registers */
+/* with the (REPORT_ID - 1) corresponding to the register address across USB */
+/* endpoint 0 using GET_REPORT and SET_REPORT */
+#define REGISTER_REPORT_SIZE	(RADIO_REGISTER_SIZE + 1)
+#define REGISTER_REPORT(reg)	((reg) + 1)
+
+/* Report 17 gives direct read/write access to the entire Si470x register */
+/* map across endpoint 0 using GET_REPORT and SET_REPORT */
+#define ENTIRE_REPORT_SIZE	(RADIO_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
+#define ENTIRE_REPORT		17
+
+/* Report 18 is used to send the lowest 6 Si470x registers up the HID */
+/* interrupt endpoint 1 to Windows every 20 milliseconds for status */
+#define RDS_REPORT_SIZE		(RDS_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
+#define RDS_REPORT		18
+
+/* Report 19: LED state */
+#define LED_REPORT_SIZE		3
+#define LED_REPORT		19
+
+/* Report 19: stream */
+#define STREAM_REPORT_SIZE	3
+#define STREAM_REPORT		19
+
+/* Report 20: scratch */
+#define SCRATCH_PAGE_SIZE	63
+#define SCRATCH_REPORT_SIZE	(SCRATCH_PAGE_SIZE + 1)
+#define SCRATCH_REPORT		20
+
+/* Reports 19-22: flash upgrade of the C8051F321 */
+#define WRITE_REPORT_SIZE	4
+#define WRITE_REPORT		19
+#define FLASH_REPORT_SIZE	64
+#define FLASH_REPORT		20
+#define CRC_REPORT_SIZE		3
+#define CRC_REPORT		21
+#define RESPONSE_REPORT_SIZE	2
+#define RESPONSE_REPORT		22
+
+/* Report 23: currently unused, but can accept 60 byte reports on the HID */
+/* interrupt out endpoint 2 every 1 millisecond */
+#define UNUSED_REPORT		23
+
+#define MAX_REPORT_SIZE		64
+
+
+
+/**************************************************************************
+ * Software/Hardware Versions from Scratch Page
+ **************************************************************************/
+#define RADIO_HW_VERSION			1
+
+
+
+/**************************************************************************
+ * LED State Definitions
+ **************************************************************************/
+#define LED_COMMAND		0x35
+
+#define NO_CHANGE_LED		0x00
+#define ALL_COLOR_LED		0x01	/* streaming state */
+#define BLINK_GREEN_LED		0x02	/* connect state */
+#define BLINK_RED_LED		0x04
+#define BLINK_ORANGE_LED	0x10	/* disconnect state */
+#define SOLID_GREEN_LED		0x20	/* tuning/seeking state */
+#define SOLID_RED_LED		0x40	/* bootload state */
+#define SOLID_ORANGE_LED	0x80
+
+
+
+/**************************************************************************
+ * Stream State Definitions
+ **************************************************************************/
+#define STREAM_COMMAND	0x36
+#define STREAM_VIDPID	0x00
+#define STREAM_AUDIO	0xff
+
+
+
+/**************************************************************************
+ * Bootloader / Flash Commands
+ **************************************************************************/
+
+/* unique id sent to bootloader and required to put into a bootload state */
+#define UNIQUE_BL_ID		0x34
+
+/* mask for the flash data */
+#define FLASH_DATA_MASK		0x55
+
+/* bootloader commands */
+#define GET_SW_VERSION_COMMAND	0x00
+#define SET_PAGE_COMMAND	0x01
+#define ERASE_PAGE_COMMAND	0x02
+#define WRITE_PAGE_COMMAND	0x03
+#define CRC_ON_PAGE_COMMAND	0x04
+#define READ_FLASH_BYTE_COMMAND	0x05
+#define RESET_DEVICE_COMMAND	0x06
+#define GET_HW_VERSION_COMMAND	0x07
+#define BLANK			0xff
+
+/* bootloader command responses */
+#define COMMAND_OK		0x01
+#define COMMAND_FAILED		0x02
+#define COMMAND_PENDING		0x03
+
+
+
+/**************************************************************************
+ * General Driver Functions - REGISTER_REPORTs
+ **************************************************************************/
+
+/*
+ * si470x_get_report - receive a HID report
+ */
+static int si470x_get_report(struct si470x_device *radio, void *buf, int size)
+{
+	unsigned char *report = buf;
+	int retval;
+
+	retval = usb_control_msg(radio->usbdev,
+		usb_rcvctrlpipe(radio->usbdev, 0),
+		HID_REQ_GET_REPORT,
+		USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
+		report[0], 2,
+		buf, size, usb_timeout);
+
+	if (retval < 0)
+		dev_warn(&radio->intf->dev,
+			"si470x_get_report: usb_control_msg returned %d\n",
+			retval);
+	return retval;
+}
+
+
+/*
+ * si470x_set_report - send a HID report
+ */
+static int si470x_set_report(struct si470x_device *radio, void *buf, int size)
+{
+	unsigned char *report = buf;
+	int retval;
+
+	retval = usb_control_msg(radio->usbdev,
+		usb_sndctrlpipe(radio->usbdev, 0),
+		HID_REQ_SET_REPORT,
+		USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
+		report[0], 2,
+		buf, size, usb_timeout);
+
+	if (retval < 0)
+		dev_warn(&radio->intf->dev,
+			"si470x_set_report: usb_control_msg returned %d\n",
+			retval);
+	return retval;
+}
+
+
+/*
+ * si470x_get_register - read register
+ */
+static int si470x_get_register(struct si470x_device *radio, int regnr)
+{
+	int retval;
+
+	radio->usb_buf[0] = REGISTER_REPORT(regnr);
+
+	retval = si470x_get_report(radio, radio->usb_buf, REGISTER_REPORT_SIZE);
+
+	if (retval >= 0)
+		radio->registers[regnr] = get_unaligned_be16(&radio->usb_buf[1]);
+
+	return (retval < 0) ? -EINVAL : 0;
+}
+
+
+/*
+ * si470x_set_register - write register
+ */
+static int si470x_set_register(struct si470x_device *radio, int regnr)
+{
+	int retval;
+
+	radio->usb_buf[0] = REGISTER_REPORT(regnr);
+	put_unaligned_be16(radio->registers[regnr], &radio->usb_buf[1]);
+
+	retval = si470x_set_report(radio, radio->usb_buf, REGISTER_REPORT_SIZE);
+
+	return (retval < 0) ? -EINVAL : 0;
+}
+
+
+
+/**************************************************************************
+ * General Driver Functions - ENTIRE_REPORT
+ **************************************************************************/
+
+/*
+ * si470x_get_all_registers - read entire registers
+ */
+static int si470x_get_all_registers(struct si470x_device *radio)
+{
+	int retval;
+	unsigned char regnr;
+
+	radio->usb_buf[0] = ENTIRE_REPORT;
+
+	retval = si470x_get_report(radio, radio->usb_buf, ENTIRE_REPORT_SIZE);
+
+	if (retval >= 0)
+		for (regnr = 0; regnr < RADIO_REGISTER_NUM; regnr++)
+			radio->registers[regnr] = get_unaligned_be16(
+				&radio->usb_buf[regnr * RADIO_REGISTER_SIZE + 1]);
+
+	return (retval < 0) ? -EINVAL : 0;
+}
+
+
+
+/**************************************************************************
+ * General Driver Functions - LED_REPORT
+ **************************************************************************/
+
+/*
+ * si470x_set_led_state - sets the led state
+ */
+static int si470x_set_led_state(struct si470x_device *radio,
+		unsigned char led_state)
+{
+	int retval;
+
+	radio->usb_buf[0] = LED_REPORT;
+	radio->usb_buf[1] = LED_COMMAND;
+	radio->usb_buf[2] = led_state;
+
+	retval = si470x_set_report(radio, radio->usb_buf, LED_REPORT_SIZE);
+
+	return (retval < 0) ? -EINVAL : 0;
+}
+
+
+
+/**************************************************************************
+ * General Driver Functions - SCRATCH_REPORT
+ **************************************************************************/
+
+/*
+ * si470x_get_scratch_versions - gets the scratch page and version infos
+ */
+static int si470x_get_scratch_page_versions(struct si470x_device *radio)
+{
+	int retval;
+
+	radio->usb_buf[0] = SCRATCH_REPORT;
+
+	retval = si470x_get_report(radio, radio->usb_buf, SCRATCH_REPORT_SIZE);
+
+	if (retval < 0)
+		dev_warn(&radio->intf->dev, "si470x_get_scratch: si470x_get_report returned %d\n",
+			 retval);
+	else {
+		radio->software_version = radio->usb_buf[1];
+		radio->hardware_version = radio->usb_buf[2];
+	}
+
+	return (retval < 0) ? -EINVAL : 0;
+}
+
+
+
+/**************************************************************************
+ * RDS Driver Functions
+ **************************************************************************/
+
+/*
+ * si470x_int_in_callback - rds callback and processing function
+ *
+ * TODO: do we need to use mutex locks in some sections?
+ */
+static void si470x_int_in_callback(struct urb *urb)
+{
+	struct si470x_device *radio = urb->context;
+	int retval;
+	unsigned char regnr;
+	unsigned char blocknum;
+	unsigned short bler; /* rds block errors */
+	unsigned short rds;
+	unsigned char tmpbuf[3];
+
+	if (urb->status) {
+		if (urb->status == -ENOENT ||
+				urb->status == -ECONNRESET ||
+				urb->status == -ESHUTDOWN) {
+			return;
+		} else {
+			dev_warn(&radio->intf->dev,
+			 "non-zero urb status (%d)\n", urb->status);
+			goto resubmit; /* Maybe we can recover. */
+		}
+	}
+
+	/* Sometimes the device returns len 0 packets */
+	if (urb->actual_length != RDS_REPORT_SIZE)
+		goto resubmit;
+
+	radio->registers[STATUSRSSI] =
+		get_unaligned_be16(&radio->int_in_buffer[1]);
+
+	if (radio->registers[STATUSRSSI] & STATUSRSSI_STC)
+		complete(&radio->completion);
+
+	if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS)) {
+		/* Update RDS registers with URB data */
+		for (regnr = 1; regnr < RDS_REGISTER_NUM; regnr++)
+			radio->registers[STATUSRSSI + regnr] =
+			    get_unaligned_be16(&radio->int_in_buffer[
+				regnr * RADIO_REGISTER_SIZE + 1]);
+		/* get rds blocks */
+		if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0) {
+			/* No RDS group ready, better luck next time */
+			goto resubmit;
+		}
+		if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSS) == 0) {
+			/* RDS decoder not synchronized */
+			goto resubmit;
+		}
+		for (blocknum = 0; blocknum < 4; blocknum++) {
+			switch (blocknum) {
+			default:
+				bler = (radio->registers[STATUSRSSI] &
+						STATUSRSSI_BLERA) >> 9;
+				rds = radio->registers[RDSA];
+				break;
+			case 1:
+				bler = (radio->registers[READCHAN] &
+						READCHAN_BLERB) >> 14;
+				rds = radio->registers[RDSB];
+				break;
+			case 2:
+				bler = (radio->registers[READCHAN] &
+						READCHAN_BLERC) >> 12;
+				rds = radio->registers[RDSC];
+				break;
+			case 3:
+				bler = (radio->registers[READCHAN] &
+						READCHAN_BLERD) >> 10;
+				rds = radio->registers[RDSD];
+				break;
+			}
+
+			/* Fill the V4L2 RDS buffer */
+			put_unaligned_le16(rds, &tmpbuf);
+			tmpbuf[2] = blocknum;		/* offset name */
+			tmpbuf[2] |= blocknum << 3;	/* received offset */
+			if (bler > max_rds_errors)
+				tmpbuf[2] |= 0x80; /* uncorrectable errors */
+			else if (bler > 0)
+				tmpbuf[2] |= 0x40; /* corrected error(s) */
+
+			/* copy RDS block to internal buffer */
+			memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
+			radio->wr_index += 3;
+
+			/* wrap write pointer */
+			if (radio->wr_index >= radio->buf_size)
+				radio->wr_index = 0;
+
+			/* check for overflow */
+			if (radio->wr_index == radio->rd_index) {
+				/* increment and wrap read pointer */
+				radio->rd_index += 3;
+				if (radio->rd_index >= radio->buf_size)
+					radio->rd_index = 0;
+			}
+		}
+		if (radio->wr_index != radio->rd_index)
+			wake_up_interruptible(&radio->read_queue);
+	}
+
+resubmit:
+	/* Resubmit if we're still running. */
+	if (radio->int_in_running && radio->usbdev) {
+		retval = usb_submit_urb(radio->int_in_urb, GFP_ATOMIC);
+		if (retval) {
+			dev_warn(&radio->intf->dev,
+			       "resubmitting urb failed (%d)", retval);
+			radio->int_in_running = 0;
+		}
+	}
+	radio->status_rssi_auto_update = radio->int_in_running;
+}
+
+
+static int si470x_fops_open(struct file *file)
+{
+	return v4l2_fh_open(file);
+}
+
+static int si470x_fops_release(struct file *file)
+{
+	return v4l2_fh_release(file);
+}
+
+static void si470x_usb_release(struct v4l2_device *v4l2_dev)
+{
+	struct si470x_device *radio =
+		container_of(v4l2_dev, struct si470x_device, v4l2_dev);
+
+	usb_free_urb(radio->int_in_urb);
+	v4l2_ctrl_handler_free(&radio->hdl);
+	v4l2_device_unregister(&radio->v4l2_dev);
+	kfree(radio->int_in_buffer);
+	kfree(radio->buffer);
+	kfree(radio->usb_buf);
+	kfree(radio);
+}
+
+
+/**************************************************************************
+ * Video4Linux Interface
+ **************************************************************************/
+
+/*
+ * si470x_vidioc_querycap - query device capabilities
+ */
+static int si470x_vidioc_querycap(struct file *file, void *priv,
+				  struct v4l2_capability *capability)
+{
+	struct si470x_device *radio = video_drvdata(file);
+
+	strscpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
+	strscpy(capability->card, DRIVER_CARD, sizeof(capability->card));
+	usb_make_path(radio->usbdev, capability->bus_info,
+			sizeof(capability->bus_info));
+	return 0;
+}
+
+
+static int si470x_start_usb(struct si470x_device *radio)
+{
+	int retval;
+
+	/* initialize interrupt urb */
+	usb_fill_int_urb(radio->int_in_urb, radio->usbdev,
+			usb_rcvintpipe(radio->usbdev,
+				radio->int_in_endpoint->bEndpointAddress),
+			radio->int_in_buffer,
+			le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize),
+			si470x_int_in_callback,
+			radio,
+			radio->int_in_endpoint->bInterval);
+
+	radio->int_in_running = 1;
+	mb();
+
+	retval = usb_submit_urb(radio->int_in_urb, GFP_KERNEL);
+	if (retval) {
+		dev_info(&radio->intf->dev,
+				"submitting int urb failed (%d)\n", retval);
+		radio->int_in_running = 0;
+	}
+	radio->status_rssi_auto_update = radio->int_in_running;
+
+	/* start radio */
+	retval = si470x_start(radio);
+	if (retval < 0)
+		return retval;
+
+	v4l2_ctrl_handler_setup(&radio->hdl);
+
+	return retval;
+}
+
+/**************************************************************************
+ * USB Interface
+ **************************************************************************/
+
+/*
+ * si470x_usb_driver_probe - probe for the device
+ */
+static int si470x_usb_driver_probe(struct usb_interface *intf,
+		const struct usb_device_id *id)
+{
+	struct si470x_device *radio;
+	struct usb_host_interface *iface_desc;
+	struct usb_endpoint_descriptor *endpoint;
+	int i, int_end_size, retval;
+	unsigned char version_warning = 0;
+
+	/* private data allocation and initialization */
+	radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
+	if (!radio) {
+		retval = -ENOMEM;
+		goto err_initial;
+	}
+	radio->usb_buf = kmalloc(MAX_REPORT_SIZE, GFP_KERNEL);
+	if (radio->usb_buf == NULL) {
+		retval = -ENOMEM;
+		goto err_radio;
+	}
+	radio->usbdev = interface_to_usbdev(intf);
+	radio->intf = intf;
+	radio->band = 1; /* Default to 76 - 108 MHz */
+	mutex_init(&radio->lock);
+	init_completion(&radio->completion);
+
+	radio->get_register = si470x_get_register;
+	radio->set_register = si470x_set_register;
+	radio->fops_open = si470x_fops_open;
+	radio->fops_release = si470x_fops_release;
+	radio->vidioc_querycap = si470x_vidioc_querycap;
+
+	iface_desc = intf->cur_altsetting;
+
+	/* Set up interrupt endpoint information. */
+	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+		endpoint = &iface_desc->endpoint[i].desc;
+		if (usb_endpoint_is_int_in(endpoint))
+			radio->int_in_endpoint = endpoint;
+	}
+	if (!radio->int_in_endpoint) {
+		dev_info(&intf->dev, "could not find interrupt in endpoint\n");
+		retval = -EIO;
+		goto err_usbbuf;
+	}
+
+	int_end_size = le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize);
+
+	radio->int_in_buffer = kmalloc(int_end_size, GFP_KERNEL);
+	if (!radio->int_in_buffer) {
+		dev_info(&intf->dev, "could not allocate int_in_buffer");
+		retval = -ENOMEM;
+		goto err_usbbuf;
+	}
+
+	radio->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!radio->int_in_urb) {
+		retval = -ENOMEM;
+		goto err_intbuffer;
+	}
+
+	radio->v4l2_dev.release = si470x_usb_release;
+
+	/*
+	 * The si470x SiLabs reference design uses the same USB IDs as
+	 * 'Thanko's Raremono' si4734 based receiver. So check here which we
+	 * have: attempt to read the device ID from the si470x: the lower 12
+	 * bits should be 0x0242 for the si470x.
+	 *
+	 * We use this check to determine which device we are dealing with.
+	 */
+	if (id->idVendor == 0x10c4 && id->idProduct == 0x818a) {
+		retval = usb_control_msg(radio->usbdev,
+				usb_rcvctrlpipe(radio->usbdev, 0),
+				HID_REQ_GET_REPORT,
+				USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
+				1, 2,
+				radio->usb_buf, 3, 500);
+		if (retval != 3 ||
+		    (get_unaligned_be16(&radio->usb_buf[1]) & 0xfff) != 0x0242) {
+			dev_info(&intf->dev, "this is not a si470x device.\n");
+			retval = -ENODEV;
+			goto err_urb;
+		}
+	}
+
+	retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
+	if (retval < 0) {
+		dev_err(&intf->dev, "couldn't register v4l2_device\n");
+		goto err_urb;
+	}
+
+	v4l2_ctrl_handler_init(&radio->hdl, 2);
+	v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
+			  V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
+	v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
+			  V4L2_CID_AUDIO_VOLUME, 0, 15, 1, 15);
+	if (radio->hdl.error) {
+		retval = radio->hdl.error;
+		dev_err(&intf->dev, "couldn't register control\n");
+		goto err_dev;
+	}
+	radio->videodev = si470x_viddev_template;
+	radio->videodev.ctrl_handler = &radio->hdl;
+	radio->videodev.lock = &radio->lock;
+	radio->videodev.v4l2_dev = &radio->v4l2_dev;
+	radio->videodev.release = video_device_release_empty;
+	radio->videodev.device_caps =
+		V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_READWRITE | V4L2_CAP_TUNER |
+		V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
+	video_set_drvdata(&radio->videodev, radio);
+
+	/* get device and chip versions */
+	if (si470x_get_all_registers(radio) < 0) {
+		retval = -EIO;
+		goto err_ctrl;
+	}
+	dev_info(&intf->dev, "DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
+			radio->registers[DEVICEID], radio->registers[SI_CHIPID]);
+	if ((radio->registers[SI_CHIPID] & SI_CHIPID_FIRMWARE) < RADIO_FW_VERSION) {
+		dev_warn(&intf->dev,
+			"This driver is known to work with firmware version %u, but the device has firmware version %u.\n",
+			RADIO_FW_VERSION,
+			radio->registers[SI_CHIPID] & SI_CHIPID_FIRMWARE);
+		version_warning = 1;
+	}
+
+	/* get software and hardware versions */
+	if (si470x_get_scratch_page_versions(radio) < 0) {
+		retval = -EIO;
+		goto err_ctrl;
+	}
+	dev_info(&intf->dev, "software version %d, hardware version %d\n",
+			radio->software_version, radio->hardware_version);
+	if (radio->hardware_version < RADIO_HW_VERSION) {
+		dev_warn(&intf->dev,
+			"This driver is known to work with hardware version %u, but the device has hardware version %u.\n",
+			RADIO_HW_VERSION,
+			radio->hardware_version);
+		version_warning = 1;
+	}
+
+	/* give out version warning */
+	if (version_warning == 1) {
+		dev_warn(&intf->dev,
+			"If you have some trouble using this driver, please report to V4L ML at linux-media@vger.kernel.org\n");
+	}
+
+	/* set led to connect state */
+	si470x_set_led_state(radio, BLINK_GREEN_LED);
+
+	/* rds buffer allocation */
+	radio->buf_size = rds_buf * 3;
+	radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
+	if (!radio->buffer) {
+		retval = -EIO;
+		goto err_ctrl;
+	}
+
+	/* rds buffer configuration */
+	radio->wr_index = 0;
+	radio->rd_index = 0;
+	init_waitqueue_head(&radio->read_queue);
+	usb_set_intfdata(intf, radio);
+
+	/* start radio */
+	retval = si470x_start_usb(radio);
+	if (retval < 0 && !radio->int_in_running)
+		goto err_buf;
+	else if (retval < 0)	/* in case of radio->int_in_running == 1 */
+		goto err_all;
+
+	/* set initial frequency */
+	si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
+
+	/* register video device */
+	retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO,
+			radio_nr);
+	if (retval) {
+		dev_err(&intf->dev, "Could not register video device\n");
+		goto err_all;
+	}
+
+	return 0;
+err_all:
+	usb_kill_urb(radio->int_in_urb);
+err_buf:
+	kfree(radio->buffer);
+err_ctrl:
+	v4l2_ctrl_handler_free(&radio->hdl);
+err_dev:
+	v4l2_device_unregister(&radio->v4l2_dev);
+err_urb:
+	usb_free_urb(radio->int_in_urb);
+err_intbuffer:
+	kfree(radio->int_in_buffer);
+err_usbbuf:
+	kfree(radio->usb_buf);
+err_radio:
+	kfree(radio);
+err_initial:
+	return retval;
+}
+
+
+/*
+ * si470x_usb_driver_suspend - suspend the device
+ */
+static int si470x_usb_driver_suspend(struct usb_interface *intf,
+		pm_message_t message)
+{
+	struct si470x_device *radio = usb_get_intfdata(intf);
+
+	dev_info(&intf->dev, "suspending now...\n");
+
+	/* shutdown interrupt handler */
+	if (radio->int_in_running) {
+		radio->int_in_running = 0;
+		if (radio->int_in_urb)
+			usb_kill_urb(radio->int_in_urb);
+	}
+
+	/* cancel read processes */
+	wake_up_interruptible(&radio->read_queue);
+
+	/* stop radio */
+	si470x_stop(radio);
+	return 0;
+}
+
+
+/*
+ * si470x_usb_driver_resume - resume the device
+ */
+static int si470x_usb_driver_resume(struct usb_interface *intf)
+{
+	struct si470x_device *radio = usb_get_intfdata(intf);
+	int ret;
+
+	dev_info(&intf->dev, "resuming now...\n");
+
+	/* start radio */
+	ret = si470x_start_usb(radio);
+	if (ret == 0)
+		v4l2_ctrl_handler_setup(&radio->hdl);
+
+	return ret;
+}
+
+
+/*
+ * si470x_usb_driver_disconnect - disconnect the device
+ */
+static void si470x_usb_driver_disconnect(struct usb_interface *intf)
+{
+	struct si470x_device *radio = usb_get_intfdata(intf);
+
+	mutex_lock(&radio->lock);
+	v4l2_device_disconnect(&radio->v4l2_dev);
+	video_unregister_device(&radio->videodev);
+	usb_kill_urb(radio->int_in_urb);
+	usb_set_intfdata(intf, NULL);
+	mutex_unlock(&radio->lock);
+	v4l2_device_put(&radio->v4l2_dev);
+}
+
+
+/*
+ * si470x_usb_driver - usb driver interface
+ *
+ * A note on suspend/resume: this driver had only empty suspend/resume
+ * functions, and when I tried to test suspend/resume it always disconnected
+ * instead of resuming (using my ADS InstantFM stick). So I've decided to
+ * remove these callbacks until someone else with better hardware can
+ * implement and test this.
+ */
+static struct usb_driver si470x_usb_driver = {
+	.name			= DRIVER_NAME,
+	.probe			= si470x_usb_driver_probe,
+	.disconnect		= si470x_usb_driver_disconnect,
+	.suspend		= si470x_usb_driver_suspend,
+	.resume			= si470x_usb_driver_resume,
+	.reset_resume		= si470x_usb_driver_resume,
+	.id_table		= si470x_usb_driver_id_table,
+};
+
+module_usb_driver(si470x_usb_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_VERSION(DRIVER_VERSION);
diff --git a/drivers/media/radio/si470x/radio-si470x.h b/drivers/media/radio/si470x/radio-si470x.h
new file mode 100644
index 000000000..e57ab54a2
--- /dev/null
+++ b/drivers/media/radio/si470x/radio-si470x.h
@@ -0,0 +1,220 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ *  drivers/media/radio/si470x/radio-si470x.h
+ *
+ *  Driver for radios with Silicon Labs Si470x FM Radio Receivers
+ *
+ *  Copyright (c) 2009 Tobias Lorenz <tobias.lorenz@gmx.net>
+ */
+
+
+/* driver definitions */
+#define DRIVER_NAME "radio-si470x"
+
+
+/* kernel includes */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/videodev2.h>
+#include <linux/mutex.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-device.h>
+#include <asm/unaligned.h>
+
+
+
+/**************************************************************************
+ * Register Definitions
+ **************************************************************************/
+#define RADIO_REGISTER_SIZE	2	/* 16 register bit width */
+#define RADIO_REGISTER_NUM	16	/* DEVICEID   ... RDSD */
+#define RDS_REGISTER_NUM	6	/* STATUSRSSI ... RDSD */
+
+#define DEVICEID		0	/* Device ID */
+#define DEVICEID_PN		0xf000	/* bits 15..12: Part Number */
+#define DEVICEID_MFGID		0x0fff	/* bits 11..00: Manufacturer ID */
+
+#define SI_CHIPID		1	/* Chip ID */
+#define SI_CHIPID_REV		0xfc00	/* bits 15..10: Chip Version */
+#define SI_CHIPID_DEV		0x0200	/* bits 09..09: Device */
+#define SI_CHIPID_FIRMWARE	0x01ff	/* bits 08..00: Firmware Version */
+
+#define POWERCFG		2	/* Power Configuration */
+#define POWERCFG_DSMUTE		0x8000	/* bits 15..15: Softmute Disable */
+#define POWERCFG_DMUTE		0x4000	/* bits 14..14: Mute Disable */
+#define POWERCFG_MONO		0x2000	/* bits 13..13: Mono Select */
+#define POWERCFG_RDSM		0x0800	/* bits 11..11: RDS Mode (Si4701 only) */
+#define POWERCFG_SKMODE		0x0400	/* bits 10..10: Seek Mode */
+#define POWERCFG_SEEKUP		0x0200	/* bits 09..09: Seek Direction */
+#define POWERCFG_SEEK		0x0100	/* bits 08..08: Seek */
+#define POWERCFG_DISABLE	0x0040	/* bits 06..06: Powerup Disable */
+#define POWERCFG_ENABLE		0x0001	/* bits 00..00: Powerup Enable */
+
+#define CHANNEL			3	/* Channel */
+#define CHANNEL_TUNE		0x8000	/* bits 15..15: Tune */
+#define CHANNEL_CHAN		0x03ff	/* bits 09..00: Channel Select */
+
+#define SYSCONFIG1		4	/* System Configuration 1 */
+#define SYSCONFIG1_RDSIEN	0x8000	/* bits 15..15: RDS Interrupt Enable (Si4701 only) */
+#define SYSCONFIG1_STCIEN	0x4000	/* bits 14..14: Seek/Tune Complete Interrupt Enable */
+#define SYSCONFIG1_RDS		0x1000	/* bits 12..12: RDS Enable (Si4701 only) */
+#define SYSCONFIG1_DE		0x0800	/* bits 11..11: De-emphasis (0=75us 1=50us) */
+#define SYSCONFIG1_AGCD		0x0400	/* bits 10..10: AGC Disable */
+#define SYSCONFIG1_BLNDADJ	0x00c0	/* bits 07..06: Stereo/Mono Blend Level Adjustment */
+#define SYSCONFIG1_GPIO3	0x0030	/* bits 05..04: General Purpose I/O 3 */
+#define SYSCONFIG1_GPIO2	0x000c	/* bits 03..02: General Purpose I/O 2 */
+#define SYSCONFIG1_GPIO2_DIS	0x0000	/* Disable GPIO 2 interrupt */
+#define SYSCONFIG1_GPIO2_INT	0x0004	/* Enable STC/RDS interrupt */
+#define SYSCONFIG1_GPIO1	0x0003	/* bits 01..00: General Purpose I/O 1 */
+
+#define SYSCONFIG2		5	/* System Configuration 2 */
+#define SYSCONFIG2_SEEKTH	0xff00	/* bits 15..08: RSSI Seek Threshold */
+#define SYSCONFIG2_BAND		0x00c0	/* bits 07..06: Band Select */
+#define SYSCONFIG2_SPACE	0x0030	/* bits 05..04: Channel Spacing */
+#define SYSCONFIG2_VOLUME	0x000f	/* bits 03..00: Volume */
+
+#define SYSCONFIG3		6	/* System Configuration 3 */
+#define SYSCONFIG3_SMUTER	0xc000	/* bits 15..14: Softmute Attack/Recover Rate */
+#define SYSCONFIG3_SMUTEA	0x3000	/* bits 13..12: Softmute Attenuation */
+#define SYSCONFIG3_SKSNR	0x00f0	/* bits 07..04: Seek SNR Threshold */
+#define SYSCONFIG3_SKCNT	0x000f	/* bits 03..00: Seek FM Impulse Detection Threshold */
+
+#define TEST1			7	/* Test 1 */
+#define TEST1_AHIZEN		0x4000	/* bits 14..14: Audio High-Z Enable */
+
+#define TEST2			8	/* Test 2 */
+/* TEST2 only contains reserved bits */
+
+#define BOOTCONFIG		9	/* Boot Configuration */
+/* BOOTCONFIG only contains reserved bits */
+
+#define STATUSRSSI		10	/* Status RSSI */
+#define STATUSRSSI_RDSR		0x8000	/* bits 15..15: RDS Ready (Si4701 only) */
+#define STATUSRSSI_STC		0x4000	/* bits 14..14: Seek/Tune Complete */
+#define STATUSRSSI_SF		0x2000	/* bits 13..13: Seek Fail/Band Limit */
+#define STATUSRSSI_AFCRL	0x1000	/* bits 12..12: AFC Rail */
+#define STATUSRSSI_RDSS		0x0800	/* bits 11..11: RDS Synchronized (Si4701 only) */
+#define STATUSRSSI_BLERA	0x0600	/* bits 10..09: RDS Block A Errors (Si4701 only) */
+#define STATUSRSSI_ST		0x0100	/* bits 08..08: Stereo Indicator */
+#define STATUSRSSI_RSSI		0x00ff	/* bits 07..00: RSSI (Received Signal Strength Indicator) */
+
+#define READCHAN		11	/* Read Channel */
+#define READCHAN_BLERB		0xc000	/* bits 15..14: RDS Block D Errors (Si4701 only) */
+#define READCHAN_BLERC		0x3000	/* bits 13..12: RDS Block C Errors (Si4701 only) */
+#define READCHAN_BLERD		0x0c00	/* bits 11..10: RDS Block B Errors (Si4701 only) */
+#define READCHAN_READCHAN	0x03ff	/* bits 09..00: Read Channel */
+
+#define RDSA			12	/* RDSA */
+#define RDSA_RDSA		0xffff	/* bits 15..00: RDS Block A Data (Si4701 only) */
+
+#define RDSB			13	/* RDSB */
+#define RDSB_RDSB		0xffff	/* bits 15..00: RDS Block B Data (Si4701 only) */
+
+#define RDSC			14	/* RDSC */
+#define RDSC_RDSC		0xffff	/* bits 15..00: RDS Block C Data (Si4701 only) */
+
+#define RDSD			15	/* RDSD */
+#define RDSD_RDSD		0xffff	/* bits 15..00: RDS Block D Data (Si4701 only) */
+
+
+
+/**************************************************************************
+ * General Driver Definitions
+ **************************************************************************/
+
+/*
+ * si470x_device - private data
+ */
+struct si470x_device {
+	struct v4l2_device v4l2_dev;
+	struct video_device videodev;
+	struct v4l2_ctrl_handler hdl;
+	int band;
+
+	/* Silabs internal registers (0..15) */
+	unsigned short registers[RADIO_REGISTER_NUM];
+
+	/* RDS receive buffer */
+	wait_queue_head_t read_queue;
+	struct mutex lock;		/* buffer locking */
+	unsigned char *buffer;		/* size is always multiple of three */
+	unsigned int buf_size;
+	unsigned int rd_index;
+	unsigned int wr_index;
+
+	struct completion completion;
+	bool status_rssi_auto_update;	/* Does RSSI get updated automatic? */
+
+	/* si470x ops */
+
+	int (*get_register)(struct si470x_device *radio, int regnr);
+	int (*set_register)(struct si470x_device *radio, int regnr);
+	int (*fops_open)(struct file *file);
+	int (*fops_release)(struct file *file);
+	int (*vidioc_querycap)(struct file *file, void *priv,
+			       struct v4l2_capability *capability);
+
+#if IS_ENABLED(CONFIG_USB_SI470X)
+	/* reference to USB and video device */
+	struct usb_device *usbdev;
+	struct usb_interface *intf;
+	char *usb_buf;
+
+	/* Interrupt endpoint handling */
+	char *int_in_buffer;
+	struct usb_endpoint_descriptor *int_in_endpoint;
+	struct urb *int_in_urb;
+	int int_in_running;
+
+	/* scratch page */
+	unsigned char software_version;
+	unsigned char hardware_version;
+#endif
+
+#if IS_ENABLED(CONFIG_I2C_SI470X)
+	struct i2c_client *client;
+	struct gpio_desc *gpio_reset;
+#endif
+};
+
+
+
+/**************************************************************************
+ * Firmware Versions
+ **************************************************************************/
+
+#define RADIO_FW_VERSION	12
+
+
+
+/**************************************************************************
+ * Frequency Multiplicator
+ **************************************************************************/
+
+/*
+ * The frequency is set in units of 62.5 Hz when using V4L2_TUNER_CAP_LOW,
+ * 62.5 kHz otherwise.
+ * The tuner is able to have a channel spacing of 50, 100 or 200 kHz.
+ * tuner->capability is therefore set to V4L2_TUNER_CAP_LOW
+ * The FREQ_MUL is then: 1 MHz / 62.5 Hz = 16000
+ */
+#define FREQ_MUL (1000000 / 62.5)
+
+
+
+/**************************************************************************
+ * Common Functions
+ **************************************************************************/
+extern const struct video_device si470x_viddev_template;
+extern const struct v4l2_ctrl_ops si470x_ctrl_ops;
+int si470x_disconnect_check(struct si470x_device *radio);
+int si470x_set_freq(struct si470x_device *radio, unsigned int freq);
+int si470x_start(struct si470x_device *radio);
+int si470x_stop(struct si470x_device *radio);