Initial import

1 files changed, 864 insertions, 0 deletions

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..57f0bc3b6
--- /dev/null
+++ b/drivers/media/radio/si470x/radio-si470x-usb.c
@@ -0,0 +1,864 @@
+/*
+ *  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>
+ *
+ * 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
+ */
+
+
+/*
+ * 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 Receiver"
+#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 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
+ */
+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
+ */
+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;
+}
+
+
+int si470x_fops_open(struct file *file)
+{
+	return v4l2_fh_open(file);
+}
+
+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
+ */
+int si470x_vidioc_querycap(struct file *file, void *priv,
+		struct v4l2_capability *capability)
+{
+	struct si470x_device *radio = video_drvdata(file);
+
+	strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
+	strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
+	usb_make_path(radio->usbdev, capability->bus_info,
+			sizeof(capability->bus_info));
+	capability->device_caps = V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_READWRITE |
+		V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
+	capability->capabilities = capability->device_caps | V4L2_CAP_DEVICE_CAPS;
+	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 = 0;
+	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);
+
+	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) {
+		dev_info(&intf->dev, "could not allocate 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;
+	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[CHIPID]);
+	if ((radio->registers[CHIPID] & CHIPID_FIRMWARE) < RADIO_FW_VERSION) {
+		dev_warn(&intf->dev,
+			"This driver is known to work with "
+			"firmware version %hu,\n", RADIO_FW_VERSION);
+		dev_warn(&intf->dev,
+			"but the device has firmware version %hu.\n",
+			radio->registers[CHIPID] & 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 %hu,\n", RADIO_HW_VERSION);
+		dev_warn(&intf->dev,
+			"but the device has hardware version %hu.\n",
+			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,\n");
+		dev_warn(&intf->dev,
+			"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)
+		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:
+	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_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);