1/*
2 *  drivers/media/radio/si470x/radio-si470x-usb.c
3 *
4 *  USB driver for radios with Silicon Labs Si470x FM Radio Receivers
5 *
6 *  Copyright (c) 2009 Tobias Lorenz <tobias.lorenz@gmx.net>
7 *
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.
12 *
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.
17 *
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
21 */
22
23
24/*
25 * ToDo:
26 * - add firmware download/update support
27 */
28
29
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"
35
36/* kernel includes */
37#include <linux/usb.h>
38#include <linux/hid.h>
39#include <linux/slab.h>
40
41#include "radio-si470x.h"
42
43
44/* USB Device ID List */
45static 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	/* Terminating entry */
55	{ }
56};
57MODULE_DEVICE_TABLE(usb, si470x_usb_driver_id_table);
58
59
60
61/**************************************************************************
62 * Module Parameters
63 **************************************************************************/
64
65/* Radio Nr */
66static int radio_nr = -1;
67module_param(radio_nr, int, 0444);
68MODULE_PARM_DESC(radio_nr, "Radio Nr");
69
70/* USB timeout */
71static unsigned int usb_timeout = 500;
72module_param(usb_timeout, uint, 0644);
73MODULE_PARM_DESC(usb_timeout, "USB timeout (ms): *500*");
74
75/* RDS buffer blocks */
76static unsigned int rds_buf = 100;
77module_param(rds_buf, uint, 0444);
78MODULE_PARM_DESC(rds_buf, "RDS buffer entries: *100*");
79
80/* RDS maximum block errors */
81static unsigned short max_rds_errors = 1;
82/* 0 means   0  errors requiring correction */
83/* 1 means 1-2  errors requiring correction (used by original USBRadio.exe) */
84/* 2 means 3-5  errors requiring correction */
85/* 3 means   6+ errors or errors in checkword, correction not possible */
86module_param(max_rds_errors, ushort, 0644);
87MODULE_PARM_DESC(max_rds_errors, "RDS maximum block errors: *1*");
88
89
90
91/**************************************************************************
92 * USB HID Reports
93 **************************************************************************/
94
95/* Reports 1-16 give direct read/write access to the 16 Si470x registers */
96/* with the (REPORT_ID - 1) corresponding to the register address across USB */
97/* endpoint 0 using GET_REPORT and SET_REPORT */
98#define REGISTER_REPORT_SIZE	(RADIO_REGISTER_SIZE + 1)
99#define REGISTER_REPORT(reg)	((reg) + 1)
100
101/* Report 17 gives direct read/write access to the entire Si470x register */
102/* map across endpoint 0 using GET_REPORT and SET_REPORT */
103#define ENTIRE_REPORT_SIZE	(RADIO_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
104#define ENTIRE_REPORT		17
105
106/* Report 18 is used to send the lowest 6 Si470x registers up the HID */
107/* interrupt endpoint 1 to Windows every 20 milliseconds for status */
108#define RDS_REPORT_SIZE		(RDS_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
109#define RDS_REPORT		18
110
111/* Report 19: LED state */
112#define LED_REPORT_SIZE		3
113#define LED_REPORT		19
114
115/* Report 19: stream */
116#define STREAM_REPORT_SIZE	3
117#define STREAM_REPORT		19
118
119/* Report 20: scratch */
120#define SCRATCH_PAGE_SIZE	63
121#define SCRATCH_REPORT_SIZE	(SCRATCH_PAGE_SIZE + 1)
122#define SCRATCH_REPORT		20
123
124/* Reports 19-22: flash upgrade of the C8051F321 */
125#define WRITE_REPORT_SIZE	4
126#define WRITE_REPORT		19
127#define FLASH_REPORT_SIZE	64
128#define FLASH_REPORT		20
129#define CRC_REPORT_SIZE		3
130#define CRC_REPORT		21
131#define RESPONSE_REPORT_SIZE	2
132#define RESPONSE_REPORT		22
133
134/* Report 23: currently unused, but can accept 60 byte reports on the HID */
135/* interrupt out endpoint 2 every 1 millisecond */
136#define UNUSED_REPORT		23
137
138
139
140/**************************************************************************
141 * Software/Hardware Versions from Scratch Page
142 **************************************************************************/
143#define RADIO_SW_VERSION_NOT_BOOTLOADABLE	6
144#define RADIO_SW_VERSION			7
145#define RADIO_HW_VERSION			1
146
147
148
149/**************************************************************************
150 * LED State Definitions
151 **************************************************************************/
152#define LED_COMMAND		0x35
153
154#define NO_CHANGE_LED		0x00
155#define ALL_COLOR_LED		0x01	/* streaming state */
156#define BLINK_GREEN_LED		0x02	/* connect state */
157#define BLINK_RED_LED		0x04
158#define BLINK_ORANGE_LED	0x10	/* disconnect state */
159#define SOLID_GREEN_LED		0x20	/* tuning/seeking state */
160#define SOLID_RED_LED		0x40	/* bootload state */
161#define SOLID_ORANGE_LED	0x80
162
163
164
165/**************************************************************************
166 * Stream State Definitions
167 **************************************************************************/
168#define STREAM_COMMAND	0x36
169#define STREAM_VIDPID	0x00
170#define STREAM_AUDIO	0xff
171
172
173
174/**************************************************************************
175 * Bootloader / Flash Commands
176 **************************************************************************/
177
178/* unique id sent to bootloader and required to put into a bootload state */
179#define UNIQUE_BL_ID		0x34
180
181/* mask for the flash data */
182#define FLASH_DATA_MASK		0x55
183
184/* bootloader commands */
185#define GET_SW_VERSION_COMMAND	0x00
186#define SET_PAGE_COMMAND	0x01
187#define ERASE_PAGE_COMMAND	0x02
188#define WRITE_PAGE_COMMAND	0x03
189#define CRC_ON_PAGE_COMMAND	0x04
190#define READ_FLASH_BYTE_COMMAND	0x05
191#define RESET_DEVICE_COMMAND	0x06
192#define GET_HW_VERSION_COMMAND	0x07
193#define BLANK			0xff
194
195/* bootloader command responses */
196#define COMMAND_OK		0x01
197#define COMMAND_FAILED		0x02
198#define COMMAND_PENDING		0x03
199
200
201
202/**************************************************************************
203 * General Driver Functions - REGISTER_REPORTs
204 **************************************************************************/
205
206/*
207 * si470x_get_report - receive a HID report
208 */
209static int si470x_get_report(struct si470x_device *radio, void *buf, int size)
210{
211	unsigned char *report = (unsigned char *) buf;
212	int retval;
213
214	retval = usb_control_msg(radio->usbdev,
215		usb_rcvctrlpipe(radio->usbdev, 0),
216		HID_REQ_GET_REPORT,
217		USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
218		report[0], 2,
219		buf, size, usb_timeout);
220
221	if (retval < 0)
222		dev_warn(&radio->intf->dev,
223			"si470x_get_report: usb_control_msg returned %d\n",
224			retval);
225	return retval;
226}
227
228
229/*
230 * si470x_set_report - send a HID report
231 */
232static int si470x_set_report(struct si470x_device *radio, void *buf, int size)
233{
234	unsigned char *report = (unsigned char *) buf;
235	int retval;
236
237	retval = usb_control_msg(radio->usbdev,
238		usb_sndctrlpipe(radio->usbdev, 0),
239		HID_REQ_SET_REPORT,
240		USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
241		report[0], 2,
242		buf, size, usb_timeout);
243
244	if (retval < 0)
245		dev_warn(&radio->intf->dev,
246			"si470x_set_report: usb_control_msg returned %d\n",
247			retval);
248	return retval;
249}
250
251
252/*
253 * si470x_get_register - read register
254 */
255int si470x_get_register(struct si470x_device *radio, int regnr)
256{
257	unsigned char buf[REGISTER_REPORT_SIZE];
258	int retval;
259
260	buf[0] = REGISTER_REPORT(regnr);
261
262	retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
263
264	if (retval >= 0)
265		radio->registers[regnr] = get_unaligned_be16(&buf[1]);
266
267	return (retval < 0) ? -EINVAL : 0;
268}
269
270
271/*
272 * si470x_set_register - write register
273 */
274int si470x_set_register(struct si470x_device *radio, int regnr)
275{
276	unsigned char buf[REGISTER_REPORT_SIZE];
277	int retval;
278
279	buf[0] = REGISTER_REPORT(regnr);
280	put_unaligned_be16(radio->registers[regnr], &buf[1]);
281
282	retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
283
284	return (retval < 0) ? -EINVAL : 0;
285}
286
287
288
289/**************************************************************************
290 * General Driver Functions - ENTIRE_REPORT
291 **************************************************************************/
292
293/*
294 * si470x_get_all_registers - read entire registers
295 */
296static int si470x_get_all_registers(struct si470x_device *radio)
297{
298	unsigned char buf[ENTIRE_REPORT_SIZE];
299	int retval;
300	unsigned char regnr;
301
302	buf[0] = ENTIRE_REPORT;
303
304	retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
305
306	if (retval >= 0)
307		for (regnr = 0; regnr < RADIO_REGISTER_NUM; regnr++)
308			radio->registers[regnr] = get_unaligned_be16(
309				&buf[regnr * RADIO_REGISTER_SIZE + 1]);
310
311	return (retval < 0) ? -EINVAL : 0;
312}
313
314
315
316/**************************************************************************
317 * General Driver Functions - LED_REPORT
318 **************************************************************************/
319
320/*
321 * si470x_set_led_state - sets the led state
322 */
323static int si470x_set_led_state(struct si470x_device *radio,
324		unsigned char led_state)
325{
326	unsigned char buf[LED_REPORT_SIZE];
327	int retval;
328
329	buf[0] = LED_REPORT;
330	buf[1] = LED_COMMAND;
331	buf[2] = led_state;
332
333	retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
334
335	return (retval < 0) ? -EINVAL : 0;
336}
337
338
339
340/**************************************************************************
341 * General Driver Functions - SCRATCH_REPORT
342 **************************************************************************/
343
344/*
345 * si470x_get_scratch_versions - gets the scratch page and version infos
346 */
347static int si470x_get_scratch_page_versions(struct si470x_device *radio)
348{
349	unsigned char buf[SCRATCH_REPORT_SIZE];
350	int retval;
351
352	buf[0] = SCRATCH_REPORT;
353
354	retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
355
356	if (retval < 0)
357		dev_warn(&radio->intf->dev, "si470x_get_scratch: "
358			"si470x_get_report returned %d\n", retval);
359	else {
360		radio->software_version = buf[1];
361		radio->hardware_version = buf[2];
362	}
363
364	return (retval < 0) ? -EINVAL : 0;
365}
366
367
368
369/**************************************************************************
370 * General Driver Functions - DISCONNECT_CHECK
371 **************************************************************************/
372
373/*
374 * si470x_disconnect_check - check whether radio disconnects
375 */
376int si470x_disconnect_check(struct si470x_device *radio)
377{
378	if (radio->disconnected)
379		return -EIO;
380	else
381		return 0;
382}
383
384
385
386/**************************************************************************
387 * RDS Driver Functions
388 **************************************************************************/
389
390/*
391 * si470x_int_in_callback - rds callback and processing function
392 *
393 * TODO: do we need to use mutex locks in some sections?
394 */
395static void si470x_int_in_callback(struct urb *urb)
396{
397	struct si470x_device *radio = urb->context;
398	int retval;
399	unsigned char regnr;
400	unsigned char blocknum;
401	unsigned short bler; /* rds block errors */
402	unsigned short rds;
403	unsigned char tmpbuf[3];
404
405	if (urb->status) {
406		if (urb->status == -ENOENT ||
407				urb->status == -ECONNRESET ||
408				urb->status == -ESHUTDOWN) {
409			return;
410		} else {
411			dev_warn(&radio->intf->dev,
412			 "non-zero urb status (%d)\n", urb->status);
413			goto resubmit; /* Maybe we can recover. */
414		}
415	}
416
417	/* safety checks */
418	if (radio->disconnected)
419		return;
420	if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
421		goto resubmit;
422
423	if (urb->actual_length > 0) {
424		/* Update RDS registers with URB data */
425		for (regnr = 0; regnr < RDS_REGISTER_NUM; regnr++)
426			radio->registers[STATUSRSSI + regnr] =
427			    get_unaligned_be16(&radio->int_in_buffer[
428				regnr * RADIO_REGISTER_SIZE + 1]);
429		/* get rds blocks */
430		if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0) {
431			/* No RDS group ready, better luck next time */
432			goto resubmit;
433		}
434		if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSS) == 0) {
435			/* RDS decoder not synchronized */
436			goto resubmit;
437		}
438		for (blocknum = 0; blocknum < 4; blocknum++) {
439			switch (blocknum) {
440			default:
441				bler = (radio->registers[STATUSRSSI] &
442						STATUSRSSI_BLERA) >> 9;
443				rds = radio->registers[RDSA];
444				break;
445			case 1:
446				bler = (radio->registers[READCHAN] &
447						READCHAN_BLERB) >> 14;
448				rds = radio->registers[RDSB];
449				break;
450			case 2:
451				bler = (radio->registers[READCHAN] &
452						READCHAN_BLERC) >> 12;
453				rds = radio->registers[RDSC];
454				break;
455			case 3:
456				bler = (radio->registers[READCHAN] &
457						READCHAN_BLERD) >> 10;
458				rds = radio->registers[RDSD];
459				break;
460			};
461
462			/* Fill the V4L2 RDS buffer */
463			put_unaligned_le16(rds, &tmpbuf);
464			tmpbuf[2] = blocknum;		/* offset name */
465			tmpbuf[2] |= blocknum << 3;	/* received offset */
466			if (bler > max_rds_errors)
467				tmpbuf[2] |= 0x80; /* uncorrectable errors */
468			else if (bler > 0)
469				tmpbuf[2] |= 0x40; /* corrected error(s) */
470
471			/* copy RDS block to internal buffer */
472			memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
473			radio->wr_index += 3;
474
475			/* wrap write pointer */
476			if (radio->wr_index >= radio->buf_size)
477				radio->wr_index = 0;
478
479			/* check for overflow */
480			if (radio->wr_index == radio->rd_index) {
481				/* increment and wrap read pointer */
482				radio->rd_index += 3;
483				if (radio->rd_index >= radio->buf_size)
484					radio->rd_index = 0;
485			}
486		}
487		if (radio->wr_index != radio->rd_index)
488			wake_up_interruptible(&radio->read_queue);
489	}
490
491resubmit:
492	/* Resubmit if we're still running. */
493	if (radio->int_in_running && radio->usbdev) {
494		retval = usb_submit_urb(radio->int_in_urb, GFP_ATOMIC);
495		if (retval) {
496			dev_warn(&radio->intf->dev,
497			       "resubmitting urb failed (%d)", retval);
498			radio->int_in_running = 0;
499		}
500	}
501}
502
503
504
505/**************************************************************************
506 * File Operations Interface
507 **************************************************************************/
508
509/*
510 * si470x_fops_open - file open
511 */
512int si470x_fops_open(struct file *file)
513{
514	struct si470x_device *radio = video_drvdata(file);
515	int retval;
516
517	mutex_lock(&radio->lock);
518	radio->users++;
519
520	retval = usb_autopm_get_interface(radio->intf);
521	if (retval < 0) {
522		radio->users--;
523		retval = -EIO;
524		goto done;
525	}
526
527	if (radio->users == 1) {
528		/* start radio */
529		retval = si470x_start(radio);
530		if (retval < 0) {
531			usb_autopm_put_interface(radio->intf);
532			goto done;
533		}
534
535		/* initialize interrupt urb */
536		usb_fill_int_urb(radio->int_in_urb, radio->usbdev,
537			usb_rcvintpipe(radio->usbdev,
538			radio->int_in_endpoint->bEndpointAddress),
539			radio->int_in_buffer,
540			le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize),
541			si470x_int_in_callback,
542			radio,
543			radio->int_in_endpoint->bInterval);
544
545		radio->int_in_running = 1;
546		mb();
547
548		retval = usb_submit_urb(radio->int_in_urb, GFP_KERNEL);
549		if (retval) {
550			dev_info(&radio->intf->dev,
551				 "submitting int urb failed (%d)\n", retval);
552			radio->int_in_running = 0;
553			usb_autopm_put_interface(radio->intf);
554		}
555	}
556
557done:
558	mutex_unlock(&radio->lock);
559	return retval;
560}
561
562
563/*
564 * si470x_fops_release - file release
565 */
566int si470x_fops_release(struct file *file)
567{
568	struct si470x_device *radio = video_drvdata(file);
569	int retval = 0;
570
571	/* safety check */
572	if (!radio) {
573		retval = -ENODEV;
574		goto done;
575	}
576
577	mutex_lock(&radio->lock);
578	radio->users--;
579	if (radio->users == 0) {
580		/* shutdown interrupt handler */
581		if (radio->int_in_running) {
582			radio->int_in_running = 0;
583		if (radio->int_in_urb)
584			usb_kill_urb(radio->int_in_urb);
585		}
586
587		if (radio->disconnected) {
588			video_unregister_device(radio->videodev);
589			kfree(radio->int_in_buffer);
590			kfree(radio->buffer);
591			mutex_unlock(&radio->lock);
592			kfree(radio);
593			goto done;
594		}
595
596		/* cancel read processes */
597		wake_up_interruptible(&radio->read_queue);
598
599		/* stop radio */
600		retval = si470x_stop(radio);
601		usb_autopm_put_interface(radio->intf);
602	}
603	mutex_unlock(&radio->lock);
604done:
605	return retval;
606}
607
608
609
610/**************************************************************************
611 * Video4Linux Interface
612 **************************************************************************/
613
614/*
615 * si470x_vidioc_querycap - query device capabilities
616 */
617int si470x_vidioc_querycap(struct file *file, void *priv,
618		struct v4l2_capability *capability)
619{
620	struct si470x_device *radio = video_drvdata(file);
621
622	strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
623	strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
624	usb_make_path(radio->usbdev, capability->bus_info,
625			sizeof(capability->bus_info));
626	capability->capabilities = V4L2_CAP_HW_FREQ_SEEK |
627		V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
628
629	return 0;
630}
631
632
633
634/**************************************************************************
635 * USB Interface
636 **************************************************************************/
637
638/*
639 * si470x_usb_driver_probe - probe for the device
640 */
641static int si470x_usb_driver_probe(struct usb_interface *intf,
642		const struct usb_device_id *id)
643{
644	struct si470x_device *radio;
645	struct usb_host_interface *iface_desc;
646	struct usb_endpoint_descriptor *endpoint;
647	int i, int_end_size, retval = 0;
648	unsigned char version_warning = 0;
649
650	/* private data allocation and initialization */
651	radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
652	if (!radio) {
653		retval = -ENOMEM;
654		goto err_initial;
655	}
656	radio->users = 0;
657	radio->disconnected = 0;
658	radio->usbdev = interface_to_usbdev(intf);
659	radio->intf = intf;
660	mutex_init(&radio->lock);
661
662	iface_desc = intf->cur_altsetting;
663
664	/* Set up interrupt endpoint information. */
665	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
666		endpoint = &iface_desc->endpoint[i].desc;
667		if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ==
668		 USB_DIR_IN) && ((endpoint->bmAttributes &
669		 USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT))
670			radio->int_in_endpoint = endpoint;
671	}
672	if (!radio->int_in_endpoint) {
673		dev_info(&intf->dev, "could not find interrupt in endpoint\n");
674		retval = -EIO;
675		goto err_radio;
676	}
677
678	int_end_size = le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize);
679
680	radio->int_in_buffer = kmalloc(int_end_size, GFP_KERNEL);
681	if (!radio->int_in_buffer) {
682		dev_info(&intf->dev, "could not allocate int_in_buffer");
683		retval = -ENOMEM;
684		goto err_radio;
685	}
686
687	radio->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
688	if (!radio->int_in_urb) {
689		dev_info(&intf->dev, "could not allocate int_in_urb");
690		retval = -ENOMEM;
691		goto err_intbuffer;
692	}
693
694	/* video device allocation and initialization */
695	radio->videodev = video_device_alloc();
696	if (!radio->videodev) {
697		retval = -ENOMEM;
698		goto err_urb;
699	}
700	memcpy(radio->videodev, &si470x_viddev_template,
701			sizeof(si470x_viddev_template));
702	video_set_drvdata(radio->videodev, radio);
703
704	/* get device and chip versions */
705	if (si470x_get_all_registers(radio) < 0) {
706		retval = -EIO;
707		goto err_video;
708	}
709	dev_info(&intf->dev, "DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
710			radio->registers[DEVICEID], radio->registers[CHIPID]);
711	if ((radio->registers[CHIPID] & CHIPID_FIRMWARE) < RADIO_FW_VERSION) {
712		dev_warn(&intf->dev,
713			"This driver is known to work with "
714			"firmware version %hu,\n", RADIO_FW_VERSION);
715		dev_warn(&intf->dev,
716			"but the device has firmware version %hu.\n",
717			radio->registers[CHIPID] & CHIPID_FIRMWARE);
718		version_warning = 1;
719	}
720
721	/* get software and hardware versions */
722	if (si470x_get_scratch_page_versions(radio) < 0) {
723		retval = -EIO;
724		goto err_video;
725	}
726	dev_info(&intf->dev, "software version %d, hardware version %d\n",
727			radio->software_version, radio->hardware_version);
728	if (radio->software_version < RADIO_SW_VERSION) {
729		dev_warn(&intf->dev,
730			"This driver is known to work with "
731			"software version %hu,\n", RADIO_SW_VERSION);
732		dev_warn(&intf->dev,
733			"but the device has software version %hu.\n",
734			radio->software_version);
735		version_warning = 1;
736	}
737	if (radio->hardware_version < RADIO_HW_VERSION) {
738		dev_warn(&intf->dev,
739			"This driver is known to work with "
740			"hardware version %hu,\n", RADIO_HW_VERSION);
741		dev_warn(&intf->dev,
742			"but the device has hardware version %hu.\n",
743			radio->hardware_version);
744		version_warning = 1;
745	}
746
747	/* give out version warning */
748	if (version_warning == 1) {
749		dev_warn(&intf->dev,
750			"If you have some trouble using this driver,\n");
751		dev_warn(&intf->dev,
752			"please report to V4L ML at "
753			"linux-media@vger.kernel.org\n");
754	}
755
756	/* set initial frequency */
757	si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
758
759	/* set led to connect state */
760	si470x_set_led_state(radio, BLINK_GREEN_LED);
761
762	/* rds buffer allocation */
763	radio->buf_size = rds_buf * 3;
764	radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
765	if (!radio->buffer) {
766		retval = -EIO;
767		goto err_video;
768	}
769
770	/* rds buffer configuration */
771	radio->wr_index = 0;
772	radio->rd_index = 0;
773	init_waitqueue_head(&radio->read_queue);
774
775	/* register video device */
776	retval = video_register_device(radio->videodev, VFL_TYPE_RADIO,
777			radio_nr);
778	if (retval) {
779		dev_warn(&intf->dev, "Could not register video device\n");
780		goto err_all;
781	}
782	usb_set_intfdata(intf, radio);
783
784	return 0;
785err_all:
786	kfree(radio->buffer);
787err_video:
788	video_device_release(radio->videodev);
789err_urb:
790	usb_free_urb(radio->int_in_urb);
791err_intbuffer:
792	kfree(radio->int_in_buffer);
793err_radio:
794	kfree(radio);
795err_initial:
796	return retval;
797}
798
799
800/*
801 * si470x_usb_driver_suspend - suspend the device
802 */
803static int si470x_usb_driver_suspend(struct usb_interface *intf,
804		pm_message_t message)
805{
806	dev_info(&intf->dev, "suspending now...\n");
807
808	return 0;
809}
810
811
812/*
813 * si470x_usb_driver_resume - resume the device
814 */
815static int si470x_usb_driver_resume(struct usb_interface *intf)
816{
817	dev_info(&intf->dev, "resuming now...\n");
818
819	return 0;
820}
821
822
823/*
824 * si470x_usb_driver_disconnect - disconnect the device
825 */
826static void si470x_usb_driver_disconnect(struct usb_interface *intf)
827{
828	struct si470x_device *radio = usb_get_intfdata(intf);
829
830	mutex_lock(&radio->lock);
831	radio->disconnected = 1;
832	usb_set_intfdata(intf, NULL);
833	if (radio->users == 0) {
834		/* set led to disconnect state */
835		si470x_set_led_state(radio, BLINK_ORANGE_LED);
836
837		/* Free data structures. */
838		usb_free_urb(radio->int_in_urb);
839
840		kfree(radio->int_in_buffer);
841		video_unregister_device(radio->videodev);
842		kfree(radio->buffer);
843		mutex_unlock(&radio->lock);
844		kfree(radio);
845	} else {
846		mutex_unlock(&radio->lock);
847	}
848}
849
850
851/*
852 * si470x_usb_driver - usb driver interface
853 */
854static struct usb_driver si470x_usb_driver = {
855	.name			= DRIVER_NAME,
856	.probe			= si470x_usb_driver_probe,
857	.disconnect		= si470x_usb_driver_disconnect,
858	.suspend		= si470x_usb_driver_suspend,
859	.resume			= si470x_usb_driver_resume,
860	.id_table		= si470x_usb_driver_id_table,
861	.supports_autosuspend	= 1,
862};
863
864module_usb_driver(si470x_usb_driver);
865
866MODULE_LICENSE("GPL");
867MODULE_AUTHOR(DRIVER_AUTHOR);
868MODULE_DESCRIPTION(DRIVER_DESC);
869MODULE_VERSION(DRIVER_VERSION);
870