2 * drivers/media/radio/si470x/radio-si470x-usb.c
4 * USB driver for radios with Silicon Labs Si470x FM Radio Receivers
6 * Copyright (c) 2009 Tobias Lorenz <tobias.lorenz@gmx.net>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 * - add firmware download/update support
30 /* driver definitions */
31 #define DRIVER_AUTHOR "Tobias Lorenz <tobias.lorenz@gmx.net>"
32 #define DRIVER_CARD "Silicon Labs Si470x FM Radio Receiver"
33 #define DRIVER_DESC "USB radio driver for Si470x FM Radio Receivers"
34 #define DRIVER_VERSION "1.0.10"
37 #include <linux/usb.h>
38 #include <linux/hid.h>
39 #include <linux/slab.h>
41 #include "radio-si470x.h"
44 /* USB Device ID List */
45 static struct usb_device_id si470x_usb_driver_id_table[] = {
46 /* Silicon Labs USB FM Radio Reference Design */
47 { USB_DEVICE_AND_INTERFACE_INFO(0x10c4, 0x818a, USB_CLASS_HID, 0, 0) },
48 /* ADS/Tech FM Radio Receiver (formerly Instant FM Music) */
49 { USB_DEVICE_AND_INTERFACE_INFO(0x06e1, 0xa155, USB_CLASS_HID, 0, 0) },
50 /* KWorld USB FM Radio SnapMusic Mobile 700 (FM700) */
51 { USB_DEVICE_AND_INTERFACE_INFO(0x1b80, 0xd700, USB_CLASS_HID, 0, 0) },
52 /* Sanei Electric, Inc. FM USB Radio (sold as DealExtreme.com PCear) */
53 { USB_DEVICE_AND_INTERFACE_INFO(0x10c5, 0x819a, USB_CLASS_HID, 0, 0) },
54 /* Axentia ALERT FM USB Receiver */
55 { USB_DEVICE_AND_INTERFACE_INFO(0x12cf, 0x7111, USB_CLASS_HID, 0, 0) },
56 /* Terminating entry */
59 MODULE_DEVICE_TABLE(usb, si470x_usb_driver_id_table);
63 /**************************************************************************
65 **************************************************************************/
68 static int radio_nr = -1;
69 module_param(radio_nr, int, 0444);
70 MODULE_PARM_DESC(radio_nr, "Radio Nr");
73 static unsigned int usb_timeout = 500;
74 module_param(usb_timeout, uint, 0644);
75 MODULE_PARM_DESC(usb_timeout, "USB timeout (ms): *500*");
77 /* RDS buffer blocks */
78 static unsigned int rds_buf = 100;
79 module_param(rds_buf, uint, 0444);
80 MODULE_PARM_DESC(rds_buf, "RDS buffer entries: *100*");
82 /* RDS maximum block errors */
83 static unsigned short max_rds_errors = 1;
84 /* 0 means 0 errors requiring correction */
85 /* 1 means 1-2 errors requiring correction (used by original USBRadio.exe) */
86 /* 2 means 3-5 errors requiring correction */
87 /* 3 means 6+ errors or errors in checkword, correction not possible */
88 module_param(max_rds_errors, ushort, 0644);
89 MODULE_PARM_DESC(max_rds_errors, "RDS maximum block errors: *1*");
93 /**************************************************************************
95 **************************************************************************/
97 /* Reports 1-16 give direct read/write access to the 16 Si470x registers */
98 /* with the (REPORT_ID - 1) corresponding to the register address across USB */
99 /* endpoint 0 using GET_REPORT and SET_REPORT */
100 #define REGISTER_REPORT_SIZE (RADIO_REGISTER_SIZE + 1)
101 #define REGISTER_REPORT(reg) ((reg) + 1)
103 /* Report 17 gives direct read/write access to the entire Si470x register */
104 /* map across endpoint 0 using GET_REPORT and SET_REPORT */
105 #define ENTIRE_REPORT_SIZE (RADIO_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
106 #define ENTIRE_REPORT 17
108 /* Report 18 is used to send the lowest 6 Si470x registers up the HID */
109 /* interrupt endpoint 1 to Windows every 20 milliseconds for status */
110 #define RDS_REPORT_SIZE (RDS_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
111 #define RDS_REPORT 18
113 /* Report 19: LED state */
114 #define LED_REPORT_SIZE 3
115 #define LED_REPORT 19
117 /* Report 19: stream */
118 #define STREAM_REPORT_SIZE 3
119 #define STREAM_REPORT 19
121 /* Report 20: scratch */
122 #define SCRATCH_PAGE_SIZE 63
123 #define SCRATCH_REPORT_SIZE (SCRATCH_PAGE_SIZE + 1)
124 #define SCRATCH_REPORT 20
126 /* Reports 19-22: flash upgrade of the C8051F321 */
127 #define WRITE_REPORT_SIZE 4
128 #define WRITE_REPORT 19
129 #define FLASH_REPORT_SIZE 64
130 #define FLASH_REPORT 20
131 #define CRC_REPORT_SIZE 3
132 #define CRC_REPORT 21
133 #define RESPONSE_REPORT_SIZE 2
134 #define RESPONSE_REPORT 22
136 /* Report 23: currently unused, but can accept 60 byte reports on the HID */
137 /* interrupt out endpoint 2 every 1 millisecond */
138 #define UNUSED_REPORT 23
142 /**************************************************************************
143 * Software/Hardware Versions from Scratch Page
144 **************************************************************************/
145 #define RADIO_SW_VERSION_NOT_BOOTLOADABLE 6
146 #define RADIO_SW_VERSION 1
147 #define RADIO_HW_VERSION 1
151 /**************************************************************************
152 * LED State Definitions
153 **************************************************************************/
154 #define LED_COMMAND 0x35
156 #define NO_CHANGE_LED 0x00
157 #define ALL_COLOR_LED 0x01 /* streaming state */
158 #define BLINK_GREEN_LED 0x02 /* connect state */
159 #define BLINK_RED_LED 0x04
160 #define BLINK_ORANGE_LED 0x10 /* disconnect state */
161 #define SOLID_GREEN_LED 0x20 /* tuning/seeking state */
162 #define SOLID_RED_LED 0x40 /* bootload state */
163 #define SOLID_ORANGE_LED 0x80
167 /**************************************************************************
168 * Stream State Definitions
169 **************************************************************************/
170 #define STREAM_COMMAND 0x36
171 #define STREAM_VIDPID 0x00
172 #define STREAM_AUDIO 0xff
176 /**************************************************************************
177 * Bootloader / Flash Commands
178 **************************************************************************/
180 /* unique id sent to bootloader and required to put into a bootload state */
181 #define UNIQUE_BL_ID 0x34
183 /* mask for the flash data */
184 #define FLASH_DATA_MASK 0x55
186 /* bootloader commands */
187 #define GET_SW_VERSION_COMMAND 0x00
188 #define SET_PAGE_COMMAND 0x01
189 #define ERASE_PAGE_COMMAND 0x02
190 #define WRITE_PAGE_COMMAND 0x03
191 #define CRC_ON_PAGE_COMMAND 0x04
192 #define READ_FLASH_BYTE_COMMAND 0x05
193 #define RESET_DEVICE_COMMAND 0x06
194 #define GET_HW_VERSION_COMMAND 0x07
197 /* bootloader command responses */
198 #define COMMAND_OK 0x01
199 #define COMMAND_FAILED 0x02
200 #define COMMAND_PENDING 0x03
204 /**************************************************************************
205 * General Driver Functions - REGISTER_REPORTs
206 **************************************************************************/
209 * si470x_get_report - receive a HID report
211 static int si470x_get_report(struct si470x_device *radio, void *buf, int size)
213 unsigned char *report = (unsigned char *) buf;
216 retval = usb_control_msg(radio->usbdev,
217 usb_rcvctrlpipe(radio->usbdev, 0),
219 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
221 buf, size, usb_timeout);
224 dev_warn(&radio->intf->dev,
225 "si470x_get_report: usb_control_msg returned %d\n",
232 * si470x_set_report - send a HID report
234 static int si470x_set_report(struct si470x_device *radio, void *buf, int size)
236 unsigned char *report = (unsigned char *) buf;
239 retval = usb_control_msg(radio->usbdev,
240 usb_sndctrlpipe(radio->usbdev, 0),
242 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
244 buf, size, usb_timeout);
247 dev_warn(&radio->intf->dev,
248 "si470x_set_report: usb_control_msg returned %d\n",
255 * si470x_get_register - read register
257 int si470x_get_register(struct si470x_device *radio, int regnr)
259 unsigned char buf[REGISTER_REPORT_SIZE];
262 buf[0] = REGISTER_REPORT(regnr);
264 retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
267 radio->registers[regnr] = get_unaligned_be16(&buf[1]);
269 return (retval < 0) ? -EINVAL : 0;
274 * si470x_set_register - write register
276 int si470x_set_register(struct si470x_device *radio, int regnr)
278 unsigned char buf[REGISTER_REPORT_SIZE];
281 buf[0] = REGISTER_REPORT(regnr);
282 put_unaligned_be16(radio->registers[regnr], &buf[1]);
284 retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
286 return (retval < 0) ? -EINVAL : 0;
291 /**************************************************************************
292 * General Driver Functions - ENTIRE_REPORT
293 **************************************************************************/
296 * si470x_get_all_registers - read entire registers
298 static int si470x_get_all_registers(struct si470x_device *radio)
300 unsigned char buf[ENTIRE_REPORT_SIZE];
304 buf[0] = ENTIRE_REPORT;
306 retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
309 for (regnr = 0; regnr < RADIO_REGISTER_NUM; regnr++)
310 radio->registers[regnr] = get_unaligned_be16(
311 &buf[regnr * RADIO_REGISTER_SIZE + 1]);
313 return (retval < 0) ? -EINVAL : 0;
318 /**************************************************************************
319 * General Driver Functions - LED_REPORT
320 **************************************************************************/
323 * si470x_set_led_state - sets the led state
325 static int si470x_set_led_state(struct si470x_device *radio,
326 unsigned char led_state)
328 unsigned char buf[LED_REPORT_SIZE];
332 buf[1] = LED_COMMAND;
335 retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
337 return (retval < 0) ? -EINVAL : 0;
342 /**************************************************************************
343 * General Driver Functions - SCRATCH_REPORT
344 **************************************************************************/
347 * si470x_get_scratch_versions - gets the scratch page and version infos
349 static int si470x_get_scratch_page_versions(struct si470x_device *radio)
351 unsigned char buf[SCRATCH_REPORT_SIZE];
354 buf[0] = SCRATCH_REPORT;
356 retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
359 dev_warn(&radio->intf->dev, "si470x_get_scratch: "
360 "si470x_get_report returned %d\n", retval);
362 radio->software_version = buf[1];
363 radio->hardware_version = buf[2];
366 return (retval < 0) ? -EINVAL : 0;
371 /**************************************************************************
372 * RDS Driver Functions
373 **************************************************************************/
376 * si470x_int_in_callback - rds callback and processing function
378 * TODO: do we need to use mutex locks in some sections?
380 static void si470x_int_in_callback(struct urb *urb)
382 struct si470x_device *radio = urb->context;
385 unsigned char blocknum;
386 unsigned short bler; /* rds block errors */
388 unsigned char tmpbuf[3];
391 if (urb->status == -ENOENT ||
392 urb->status == -ECONNRESET ||
393 urb->status == -ESHUTDOWN) {
396 dev_warn(&radio->intf->dev,
397 "non-zero urb status (%d)\n", urb->status);
398 goto resubmit; /* Maybe we can recover. */
402 /* Sometimes the device returns len 0 packets */
403 if (urb->actual_length != RDS_REPORT_SIZE)
406 radio->registers[STATUSRSSI] =
407 get_unaligned_be16(&radio->int_in_buffer[1]);
409 if (radio->registers[STATUSRSSI] & STATUSRSSI_STC)
410 complete(&radio->completion);
412 if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS)) {
413 /* Update RDS registers with URB data */
414 for (regnr = 1; regnr < RDS_REGISTER_NUM; regnr++)
415 radio->registers[STATUSRSSI + regnr] =
416 get_unaligned_be16(&radio->int_in_buffer[
417 regnr * RADIO_REGISTER_SIZE + 1]);
419 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0) {
420 /* No RDS group ready, better luck next time */
423 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSS) == 0) {
424 /* RDS decoder not synchronized */
427 for (blocknum = 0; blocknum < 4; blocknum++) {
430 bler = (radio->registers[STATUSRSSI] &
431 STATUSRSSI_BLERA) >> 9;
432 rds = radio->registers[RDSA];
435 bler = (radio->registers[READCHAN] &
436 READCHAN_BLERB) >> 14;
437 rds = radio->registers[RDSB];
440 bler = (radio->registers[READCHAN] &
441 READCHAN_BLERC) >> 12;
442 rds = radio->registers[RDSC];
445 bler = (radio->registers[READCHAN] &
446 READCHAN_BLERD) >> 10;
447 rds = radio->registers[RDSD];
451 /* Fill the V4L2 RDS buffer */
452 put_unaligned_le16(rds, &tmpbuf);
453 tmpbuf[2] = blocknum; /* offset name */
454 tmpbuf[2] |= blocknum << 3; /* received offset */
455 if (bler > max_rds_errors)
456 tmpbuf[2] |= 0x80; /* uncorrectable errors */
458 tmpbuf[2] |= 0x40; /* corrected error(s) */
460 /* copy RDS block to internal buffer */
461 memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
462 radio->wr_index += 3;
464 /* wrap write pointer */
465 if (radio->wr_index >= radio->buf_size)
468 /* check for overflow */
469 if (radio->wr_index == radio->rd_index) {
470 /* increment and wrap read pointer */
471 radio->rd_index += 3;
472 if (radio->rd_index >= radio->buf_size)
476 if (radio->wr_index != radio->rd_index)
477 wake_up_interruptible(&radio->read_queue);
481 /* Resubmit if we're still running. */
482 if (radio->int_in_running && radio->usbdev) {
483 retval = usb_submit_urb(radio->int_in_urb, GFP_ATOMIC);
485 dev_warn(&radio->intf->dev,
486 "resubmitting urb failed (%d)", retval);
487 radio->int_in_running = 0;
490 radio->status_rssi_auto_update = radio->int_in_running;
494 int si470x_fops_open(struct file *file)
496 return v4l2_fh_open(file);
499 int si470x_fops_release(struct file *file)
501 return v4l2_fh_release(file);
504 static void si470x_usb_release(struct v4l2_device *v4l2_dev)
506 struct si470x_device *radio =
507 container_of(v4l2_dev, struct si470x_device, v4l2_dev);
509 usb_free_urb(radio->int_in_urb);
510 v4l2_ctrl_handler_free(&radio->hdl);
511 v4l2_device_unregister(&radio->v4l2_dev);
512 kfree(radio->int_in_buffer);
513 kfree(radio->buffer);
518 /**************************************************************************
519 * Video4Linux Interface
520 **************************************************************************/
523 * si470x_vidioc_querycap - query device capabilities
525 int si470x_vidioc_querycap(struct file *file, void *priv,
526 struct v4l2_capability *capability)
528 struct si470x_device *radio = video_drvdata(file);
530 strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
531 strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
532 usb_make_path(radio->usbdev, capability->bus_info,
533 sizeof(capability->bus_info));
534 capability->device_caps = V4L2_CAP_HW_FREQ_SEEK |
535 V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
536 capability->capabilities = capability->device_caps | V4L2_CAP_DEVICE_CAPS;
541 static int si470x_start_usb(struct si470x_device *radio)
545 /* initialize interrupt urb */
546 usb_fill_int_urb(radio->int_in_urb, radio->usbdev,
547 usb_rcvintpipe(radio->usbdev,
548 radio->int_in_endpoint->bEndpointAddress),
549 radio->int_in_buffer,
550 le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize),
551 si470x_int_in_callback,
553 radio->int_in_endpoint->bInterval);
555 radio->int_in_running = 1;
558 retval = usb_submit_urb(radio->int_in_urb, GFP_KERNEL);
560 dev_info(&radio->intf->dev,
561 "submitting int urb failed (%d)\n", retval);
562 radio->int_in_running = 0;
564 radio->status_rssi_auto_update = radio->int_in_running;
567 retval = si470x_start(radio);
571 v4l2_ctrl_handler_setup(&radio->hdl);
576 /**************************************************************************
578 **************************************************************************/
581 * si470x_usb_driver_probe - probe for the device
583 static int si470x_usb_driver_probe(struct usb_interface *intf,
584 const struct usb_device_id *id)
586 struct si470x_device *radio;
587 struct usb_host_interface *iface_desc;
588 struct usb_endpoint_descriptor *endpoint;
589 int i, int_end_size, retval = 0;
590 unsigned char version_warning = 0;
592 /* private data allocation and initialization */
593 radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
598 radio->usbdev = interface_to_usbdev(intf);
600 mutex_init(&radio->lock);
601 init_completion(&radio->completion);
603 iface_desc = intf->cur_altsetting;
605 /* Set up interrupt endpoint information. */
606 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
607 endpoint = &iface_desc->endpoint[i].desc;
608 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ==
609 USB_DIR_IN) && ((endpoint->bmAttributes &
610 USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT))
611 radio->int_in_endpoint = endpoint;
613 if (!radio->int_in_endpoint) {
614 dev_info(&intf->dev, "could not find interrupt in endpoint\n");
619 int_end_size = le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize);
621 radio->int_in_buffer = kmalloc(int_end_size, GFP_KERNEL);
622 if (!radio->int_in_buffer) {
623 dev_info(&intf->dev, "could not allocate int_in_buffer");
628 radio->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
629 if (!radio->int_in_urb) {
630 dev_info(&intf->dev, "could not allocate int_in_urb");
635 radio->v4l2_dev.release = si470x_usb_release;
636 retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
638 dev_err(&intf->dev, "couldn't register v4l2_device\n");
642 v4l2_ctrl_handler_init(&radio->hdl, 2);
643 v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
644 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
645 v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
646 V4L2_CID_AUDIO_VOLUME, 0, 15, 1, 15);
647 if (radio->hdl.error) {
648 retval = radio->hdl.error;
649 dev_err(&intf->dev, "couldn't register control\n");
652 radio->videodev = si470x_viddev_template;
653 radio->videodev.ctrl_handler = &radio->hdl;
654 radio->videodev.lock = &radio->lock;
655 radio->videodev.v4l2_dev = &radio->v4l2_dev;
656 radio->videodev.release = video_device_release_empty;
657 set_bit(V4L2_FL_USE_FH_PRIO, &radio->videodev.flags);
658 video_set_drvdata(&radio->videodev, radio);
660 /* get device and chip versions */
661 if (si470x_get_all_registers(radio) < 0) {
665 dev_info(&intf->dev, "DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
666 radio->registers[DEVICEID], radio->registers[CHIPID]);
667 if ((radio->registers[CHIPID] & CHIPID_FIRMWARE) < RADIO_FW_VERSION) {
669 "This driver is known to work with "
670 "firmware version %hu,\n", RADIO_FW_VERSION);
672 "but the device has firmware version %hu.\n",
673 radio->registers[CHIPID] & CHIPID_FIRMWARE);
677 /* get software and hardware versions */
678 if (si470x_get_scratch_page_versions(radio) < 0) {
682 dev_info(&intf->dev, "software version %d, hardware version %d\n",
683 radio->software_version, radio->hardware_version);
684 if (radio->software_version < RADIO_SW_VERSION) {
686 "This driver is known to work with "
687 "software version %hu,\n", RADIO_SW_VERSION);
689 "but the device has software version %hu.\n",
690 radio->software_version);
693 if (radio->hardware_version < RADIO_HW_VERSION) {
695 "This driver is known to work with "
696 "hardware version %hu,\n", RADIO_HW_VERSION);
698 "but the device has hardware version %hu.\n",
699 radio->hardware_version);
703 /* give out version warning */
704 if (version_warning == 1) {
706 "If you have some trouble using this driver,\n");
708 "please report to V4L ML at "
709 "linux-media@vger.kernel.org\n");
712 /* set led to connect state */
713 si470x_set_led_state(radio, BLINK_GREEN_LED);
715 /* rds buffer allocation */
716 radio->buf_size = rds_buf * 3;
717 radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
718 if (!radio->buffer) {
723 /* rds buffer configuration */
726 init_waitqueue_head(&radio->read_queue);
727 usb_set_intfdata(intf, radio);
730 retval = si470x_start_usb(radio);
734 /* set initial frequency */
735 si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
737 /* register video device */
738 retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO,
741 dev_err(&intf->dev, "Could not register video device\n");
747 kfree(radio->buffer);
749 v4l2_ctrl_handler_free(&radio->hdl);
751 v4l2_device_unregister(&radio->v4l2_dev);
753 usb_free_urb(radio->int_in_urb);
755 kfree(radio->int_in_buffer);
764 * si470x_usb_driver_suspend - suspend the device
766 static int si470x_usb_driver_suspend(struct usb_interface *intf,
767 pm_message_t message)
769 struct si470x_device *radio = usb_get_intfdata(intf);
771 dev_info(&intf->dev, "suspending now...\n");
773 /* shutdown interrupt handler */
774 if (radio->int_in_running) {
775 radio->int_in_running = 0;
776 if (radio->int_in_urb)
777 usb_kill_urb(radio->int_in_urb);
780 /* cancel read processes */
781 wake_up_interruptible(&radio->read_queue);
790 * si470x_usb_driver_resume - resume the device
792 static int si470x_usb_driver_resume(struct usb_interface *intf)
794 struct si470x_device *radio = usb_get_intfdata(intf);
796 dev_info(&intf->dev, "resuming now...\n");
799 return si470x_start_usb(radio);
804 * si470x_usb_driver_disconnect - disconnect the device
806 static void si470x_usb_driver_disconnect(struct usb_interface *intf)
808 struct si470x_device *radio = usb_get_intfdata(intf);
810 mutex_lock(&radio->lock);
811 v4l2_device_disconnect(&radio->v4l2_dev);
812 video_unregister_device(&radio->videodev);
813 usb_set_intfdata(intf, NULL);
814 mutex_unlock(&radio->lock);
815 v4l2_device_put(&radio->v4l2_dev);
820 * si470x_usb_driver - usb driver interface
822 * A note on suspend/resume: this driver had only empty suspend/resume
823 * functions, and when I tried to test suspend/resume it always disconnected
824 * instead of resuming (using my ADS InstantFM stick). So I've decided to
825 * remove these callbacks until someone else with better hardware can
826 * implement and test this.
828 static struct usb_driver si470x_usb_driver = {
830 .probe = si470x_usb_driver_probe,
831 .disconnect = si470x_usb_driver_disconnect,
832 .suspend = si470x_usb_driver_suspend,
833 .resume = si470x_usb_driver_resume,
834 .reset_resume = si470x_usb_driver_resume,
835 .id_table = si470x_usb_driver_id_table,
838 module_usb_driver(si470x_usb_driver);
840 MODULE_LICENSE("GPL");
841 MODULE_AUTHOR(DRIVER_AUTHOR);
842 MODULE_DESCRIPTION(DRIVER_DESC);
843 MODULE_VERSION(DRIVER_VERSION);