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/drivers/media/radio/si470x/radio-si470x-usb.c

https://bitbucket.org/wisechild/galaxy-nexus
C | 897 lines | 533 code | 169 blank | 195 comment | 69 complexity | b49044c566ef499e717b77b541f8ebdf MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  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_KERNEL_VERSION KERNEL_VERSION(1, 0, 10)
 33#define DRIVER_CARD "Silicon Labs Si470x FM Radio Receiver"
 34#define DRIVER_DESC "USB radio driver for Si470x FM Radio Receivers"
 35#define DRIVER_VERSION "1.0.10"
 36
 37/* kernel includes */
 38#include <linux/usb.h>
 39#include <linux/hid.h>
 40#include <linux/slab.h>
 41
 42#include "radio-si470x.h"
 43
 44
 45/* USB Device ID List */
 46static struct usb_device_id si470x_usb_driver_id_table[] = {
 47	/* Silicon Labs USB FM Radio Reference Design */
 48	{ USB_DEVICE_AND_INTERFACE_INFO(0x10c4, 0x818a, USB_CLASS_HID, 0, 0) },
 49	/* ADS/Tech FM Radio Receiver (formerly Instant FM Music) */
 50	{ USB_DEVICE_AND_INTERFACE_INFO(0x06e1, 0xa155, USB_CLASS_HID, 0, 0) },
 51	/* KWorld USB FM Radio SnapMusic Mobile 700 (FM700) */
 52	{ USB_DEVICE_AND_INTERFACE_INFO(0x1b80, 0xd700, USB_CLASS_HID, 0, 0) },
 53	/* Sanei Electric, Inc. FM USB Radio (sold as DealExtreme.com PCear) */
 54	{ USB_DEVICE_AND_INTERFACE_INFO(0x10c5, 0x819a, USB_CLASS_HID, 0, 0) },
 55	/* Terminating entry */
 56	{ }
 57};
 58MODULE_DEVICE_TABLE(usb, si470x_usb_driver_id_table);
 59
 60
 61
 62/**************************************************************************
 63 * Module Parameters
 64 **************************************************************************/
 65
 66/* Radio Nr */
 67static int radio_nr = -1;
 68module_param(radio_nr, int, 0444);
 69MODULE_PARM_DESC(radio_nr, "Radio Nr");
 70
 71/* USB timeout */
 72static unsigned int usb_timeout = 500;
 73module_param(usb_timeout, uint, 0644);
 74MODULE_PARM_DESC(usb_timeout, "USB timeout (ms): *500*");
 75
 76/* RDS buffer blocks */
 77static unsigned int rds_buf = 100;
 78module_param(rds_buf, uint, 0444);
 79MODULE_PARM_DESC(rds_buf, "RDS buffer entries: *100*");
 80
 81/* RDS maximum block errors */
 82static unsigned short max_rds_errors = 1;
 83/* 0 means   0  errors requiring correction */
 84/* 1 means 1-2  errors requiring correction (used by original USBRadio.exe) */
 85/* 2 means 3-5  errors requiring correction */
 86/* 3 means   6+ errors or errors in checkword, correction not possible */
 87module_param(max_rds_errors, ushort, 0644);
 88MODULE_PARM_DESC(max_rds_errors, "RDS maximum block errors: *1*");
 89
 90
 91
 92/**************************************************************************
 93 * USB HID Reports
 94 **************************************************************************/
 95
 96/* Reports 1-16 give direct read/write access to the 16 Si470x registers */
 97/* with the (REPORT_ID - 1) corresponding to the register address across USB */
 98/* endpoint 0 using GET_REPORT and SET_REPORT */
 99#define REGISTER_REPORT_SIZE	(RADIO_REGISTER_SIZE + 1)
100#define REGISTER_REPORT(reg)	((reg) + 1)
101
102/* Report 17 gives direct read/write access to the entire Si470x register */
103/* map across endpoint 0 using GET_REPORT and SET_REPORT */
104#define ENTIRE_REPORT_SIZE	(RADIO_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
105#define ENTIRE_REPORT		17
106
107/* Report 18 is used to send the lowest 6 Si470x registers up the HID */
108/* interrupt endpoint 1 to Windows every 20 milliseconds for status */
109#define RDS_REPORT_SIZE		(RDS_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
110#define RDS_REPORT		18
111
112/* Report 19: LED state */
113#define LED_REPORT_SIZE		3
114#define LED_REPORT		19
115
116/* Report 19: stream */
117#define STREAM_REPORT_SIZE	3
118#define STREAM_REPORT		19
119
120/* Report 20: scratch */
121#define SCRATCH_PAGE_SIZE	63
122#define SCRATCH_REPORT_SIZE	(SCRATCH_PAGE_SIZE + 1)
123#define SCRATCH_REPORT		20
124
125/* Reports 19-22: flash upgrade of the C8051F321 */
126#define WRITE_REPORT_SIZE	4
127#define WRITE_REPORT		19
128#define FLASH_REPORT_SIZE	64
129#define FLASH_REPORT		20
130#define CRC_REPORT_SIZE		3
131#define CRC_REPORT		21
132#define RESPONSE_REPORT_SIZE	2
133#define RESPONSE_REPORT		22
134
135/* Report 23: currently unused, but can accept 60 byte reports on the HID */
136/* interrupt out endpoint 2 every 1 millisecond */
137#define UNUSED_REPORT		23
138
139
140
141/**************************************************************************
142 * Software/Hardware Versions from Scratch Page
143 **************************************************************************/
144#define RADIO_SW_VERSION_NOT_BOOTLOADABLE	6
145#define RADIO_SW_VERSION			7
146#define RADIO_HW_VERSION			1
147
148
149
150/**************************************************************************
151 * LED State Definitions
152 **************************************************************************/
153#define LED_COMMAND		0x35
154
155#define NO_CHANGE_LED		0x00
156#define ALL_COLOR_LED		0x01	/* streaming state */
157#define BLINK_GREEN_LED		0x02	/* connect state */
158#define BLINK_RED_LED		0x04
159#define BLINK_ORANGE_LED	0x10	/* disconnect state */
160#define SOLID_GREEN_LED		0x20	/* tuning/seeking state */
161#define SOLID_RED_LED		0x40	/* bootload state */
162#define SOLID_ORANGE_LED	0x80
163
164
165
166/**************************************************************************
167 * Stream State Definitions
168 **************************************************************************/
169#define STREAM_COMMAND	0x36
170#define STREAM_VIDPID	0x00
171#define STREAM_AUDIO	0xff
172
173
174
175/**************************************************************************
176 * Bootloader / Flash Commands
177 **************************************************************************/
178
179/* unique id sent to bootloader and required to put into a bootload state */
180#define UNIQUE_BL_ID		0x34
181
182/* mask for the flash data */
183#define FLASH_DATA_MASK		0x55
184
185/* bootloader commands */
186#define GET_SW_VERSION_COMMAND	0x00
187#define SET_PAGE_COMMAND	0x01
188#define ERASE_PAGE_COMMAND	0x02
189#define WRITE_PAGE_COMMAND	0x03
190#define CRC_ON_PAGE_COMMAND	0x04
191#define READ_FLASH_BYTE_COMMAND	0x05
192#define RESET_DEVICE_COMMAND	0x06
193#define GET_HW_VERSION_COMMAND	0x07
194#define BLANK			0xff
195
196/* bootloader command responses */
197#define COMMAND_OK		0x01
198#define COMMAND_FAILED		0x02
199#define COMMAND_PENDING		0x03
200
201
202
203/**************************************************************************
204 * General Driver Functions - REGISTER_REPORTs
205 **************************************************************************/
206
207/*
208 * si470x_get_report - receive a HID report
209 */
210static int si470x_get_report(struct si470x_device *radio, void *buf, int size)
211{
212	unsigned char *report = (unsigned char *) buf;
213	int retval;
214
215	retval = usb_control_msg(radio->usbdev,
216		usb_rcvctrlpipe(radio->usbdev, 0),
217		HID_REQ_GET_REPORT,
218		USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
219		report[0], 2,
220		buf, size, usb_timeout);
221
222	if (retval < 0)
223		dev_warn(&radio->intf->dev,
224			"si470x_get_report: usb_control_msg returned %d\n",
225			retval);
226	return retval;
227}
228
229
230/*
231 * si470x_set_report - send a HID report
232 */
233static int si470x_set_report(struct si470x_device *radio, void *buf, int size)
234{
235	unsigned char *report = (unsigned char *) buf;
236	int retval;
237
238	retval = usb_control_msg(radio->usbdev,
239		usb_sndctrlpipe(radio->usbdev, 0),
240		HID_REQ_SET_REPORT,
241		USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
242		report[0], 2,
243		buf, size, usb_timeout);
244
245	if (retval < 0)
246		dev_warn(&radio->intf->dev,
247			"si470x_set_report: usb_control_msg returned %d\n",
248			retval);
249	return retval;
250}
251
252
253/*
254 * si470x_get_register - read register
255 */
256int si470x_get_register(struct si470x_device *radio, int regnr)
257{
258	unsigned char buf[REGISTER_REPORT_SIZE];
259	int retval;
260
261	buf[0] = REGISTER_REPORT(regnr);
262
263	retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
264
265	if (retval >= 0)
266		radio->registers[regnr] = get_unaligned_be16(&buf[1]);
267
268	return (retval < 0) ? -EINVAL : 0;
269}
270
271
272/*
273 * si470x_set_register - write register
274 */
275int si470x_set_register(struct si470x_device *radio, int regnr)
276{
277	unsigned char buf[REGISTER_REPORT_SIZE];
278	int retval;
279
280	buf[0] = REGISTER_REPORT(regnr);
281	put_unaligned_be16(radio->registers[regnr], &buf[1]);
282
283	retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
284
285	return (retval < 0) ? -EINVAL : 0;
286}
287
288
289
290/**************************************************************************
291 * General Driver Functions - ENTIRE_REPORT
292 **************************************************************************/
293
294/*
295 * si470x_get_all_registers - read entire registers
296 */
297static int si470x_get_all_registers(struct si470x_device *radio)
298{
299	unsigned char buf[ENTIRE_REPORT_SIZE];
300	int retval;
301	unsigned char regnr;
302
303	buf[0] = ENTIRE_REPORT;
304
305	retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
306
307	if (retval >= 0)
308		for (regnr = 0; regnr < RADIO_REGISTER_NUM; regnr++)
309			radio->registers[regnr] = get_unaligned_be16(
310				&buf[regnr * RADIO_REGISTER_SIZE + 1]);
311
312	return (retval < 0) ? -EINVAL : 0;
313}
314
315
316
317/**************************************************************************
318 * General Driver Functions - LED_REPORT
319 **************************************************************************/
320
321/*
322 * si470x_set_led_state - sets the led state
323 */
324static int si470x_set_led_state(struct si470x_device *radio,
325		unsigned char led_state)
326{
327	unsigned char buf[LED_REPORT_SIZE];
328	int retval;
329
330	buf[0] = LED_REPORT;
331	buf[1] = LED_COMMAND;
332	buf[2] = led_state;
333
334	retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
335
336	return (retval < 0) ? -EINVAL : 0;
337}
338
339
340
341/**************************************************************************
342 * General Driver Functions - SCRATCH_REPORT
343 **************************************************************************/
344
345/*
346 * si470x_get_scratch_versions - gets the scratch page and version infos
347 */
348static int si470x_get_scratch_page_versions(struct si470x_device *radio)
349{
350	unsigned char buf[SCRATCH_REPORT_SIZE];
351	int retval;
352
353	buf[0] = SCRATCH_REPORT;
354
355	retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
356
357	if (retval < 0)
358		dev_warn(&radio->intf->dev, "si470x_get_scratch: "
359			"si470x_get_report returned %d\n", retval);
360	else {
361		radio->software_version = buf[1];
362		radio->hardware_version = buf[2];
363	}
364
365	return (retval < 0) ? -EINVAL : 0;
366}
367
368
369
370/**************************************************************************
371 * General Driver Functions - DISCONNECT_CHECK
372 **************************************************************************/
373
374/*
375 * si470x_disconnect_check - check whether radio disconnects
376 */
377int si470x_disconnect_check(struct si470x_device *radio)
378{
379	if (radio->disconnected)
380		return -EIO;
381	else
382		return 0;
383}
384
385
386
387/**************************************************************************
388 * RDS Driver Functions
389 **************************************************************************/
390
391/*
392 * si470x_int_in_callback - rds callback and processing function
393 *
394 * TODO: do we need to use mutex locks in some sections?
395 */
396static void si470x_int_in_callback(struct urb *urb)
397{
398	struct si470x_device *radio = urb->context;
399	unsigned char buf[RDS_REPORT_SIZE];
400	int retval;
401	unsigned char regnr;
402	unsigned char blocknum;
403	unsigned short bler; /* rds block errors */
404	unsigned short rds;
405	unsigned char tmpbuf[3];
406
407	if (urb->status) {
408		if (urb->status == -ENOENT ||
409				urb->status == -ECONNRESET ||
410				urb->status == -ESHUTDOWN) {
411			return;
412		} else {
413			dev_warn(&radio->intf->dev,
414			 "non-zero urb status (%d)\n", urb->status);
415			goto resubmit; /* Maybe we can recover. */
416		}
417	}
418
419	/* safety checks */
420	if (radio->disconnected)
421		return;
422	if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
423		goto resubmit;
424
425	if (urb->actual_length > 0) {
426		/* Update RDS registers with URB data */
427		buf[0] = RDS_REPORT;
428		for (regnr = 0; regnr < RDS_REGISTER_NUM; regnr++)
429			radio->registers[STATUSRSSI + regnr] =
430			    get_unaligned_be16(&radio->int_in_buffer[
431				regnr * RADIO_REGISTER_SIZE + 1]);
432		/* get rds blocks */
433		if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0) {
434			/* No RDS group ready, better luck next time */
435			goto resubmit;
436		}
437		if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSS) == 0) {
438			/* RDS decoder not synchronized */
439			goto resubmit;
440		}
441		for (blocknum = 0; blocknum < 4; blocknum++) {
442			switch (blocknum) {
443			default:
444				bler = (radio->registers[STATUSRSSI] &
445						STATUSRSSI_BLERA) >> 9;
446				rds = radio->registers[RDSA];
447				break;
448			case 1:
449				bler = (radio->registers[READCHAN] &
450						READCHAN_BLERB) >> 14;
451				rds = radio->registers[RDSB];
452				break;
453			case 2:
454				bler = (radio->registers[READCHAN] &
455						READCHAN_BLERC) >> 12;
456				rds = radio->registers[RDSC];
457				break;
458			case 3:
459				bler = (radio->registers[READCHAN] &
460						READCHAN_BLERD) >> 10;
461				rds = radio->registers[RDSD];
462				break;
463			};
464
465			/* Fill the V4L2 RDS buffer */
466			put_unaligned_le16(rds, &tmpbuf);
467			tmpbuf[2] = blocknum;		/* offset name */
468			tmpbuf[2] |= blocknum << 3;	/* received offset */
469			if (bler > max_rds_errors)
470				tmpbuf[2] |= 0x80; /* uncorrectable errors */
471			else if (bler > 0)
472				tmpbuf[2] |= 0x40; /* corrected error(s) */
473
474			/* copy RDS block to internal buffer */
475			memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
476			radio->wr_index += 3;
477
478			/* wrap write pointer */
479			if (radio->wr_index >= radio->buf_size)
480				radio->wr_index = 0;
481
482			/* check for overflow */
483			if (radio->wr_index == radio->rd_index) {
484				/* increment and wrap read pointer */
485				radio->rd_index += 3;
486				if (radio->rd_index >= radio->buf_size)
487					radio->rd_index = 0;
488			}
489		}
490		if (radio->wr_index != radio->rd_index)
491			wake_up_interruptible(&radio->read_queue);
492	}
493
494resubmit:
495	/* Resubmit if we're still running. */
496	if (radio->int_in_running && radio->usbdev) {
497		retval = usb_submit_urb(radio->int_in_urb, GFP_ATOMIC);
498		if (retval) {
499			dev_warn(&radio->intf->dev,
500			       "resubmitting urb failed (%d)", retval);
501			radio->int_in_running = 0;
502		}
503	}
504}
505
506
507
508/**************************************************************************
509 * File Operations Interface
510 **************************************************************************/
511
512/*
513 * si470x_fops_open - file open
514 */
515int si470x_fops_open(struct file *file)
516{
517	struct si470x_device *radio = video_drvdata(file);
518	int retval;
519
520	mutex_lock(&radio->lock);
521	radio->users++;
522
523	retval = usb_autopm_get_interface(radio->intf);
524	if (retval < 0) {
525		radio->users--;
526		retval = -EIO;
527		goto done;
528	}
529
530	if (radio->users == 1) {
531		/* start radio */
532		retval = si470x_start(radio);
533		if (retval < 0) {
534			usb_autopm_put_interface(radio->intf);
535			goto done;
536		}
537
538		/* initialize interrupt urb */
539		usb_fill_int_urb(radio->int_in_urb, radio->usbdev,
540			usb_rcvintpipe(radio->usbdev,
541			radio->int_in_endpoint->bEndpointAddress),
542			radio->int_in_buffer,
543			le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize),
544			si470x_int_in_callback,
545			radio,
546			radio->int_in_endpoint->bInterval);
547
548		radio->int_in_running = 1;
549		mb();
550
551		retval = usb_submit_urb(radio->int_in_urb, GFP_KERNEL);
552		if (retval) {
553			dev_info(&radio->intf->dev,
554				 "submitting int urb failed (%d)\n", retval);
555			radio->int_in_running = 0;
556			usb_autopm_put_interface(radio->intf);
557		}
558	}
559
560done:
561	mutex_unlock(&radio->lock);
562	return retval;
563}
564
565
566/*
567 * si470x_fops_release - file release
568 */
569int si470x_fops_release(struct file *file)
570{
571	struct si470x_device *radio = video_drvdata(file);
572	int retval = 0;
573
574	/* safety check */
575	if (!radio) {
576		retval = -ENODEV;
577		goto done;
578	}
579
580	mutex_lock(&radio->lock);
581	radio->users--;
582	if (radio->users == 0) {
583		/* shutdown interrupt handler */
584		if (radio->int_in_running) {
585			radio->int_in_running = 0;
586		if (radio->int_in_urb)
587			usb_kill_urb(radio->int_in_urb);
588		}
589
590		if (radio->disconnected) {
591			video_unregister_device(radio->videodev);
592			kfree(radio->int_in_buffer);
593			kfree(radio->buffer);
594			mutex_unlock(&radio->lock);
595			kfree(radio);
596			goto done;
597		}
598
599		/* cancel read processes */
600		wake_up_interruptible(&radio->read_queue);
601
602		/* stop radio */
603		retval = si470x_stop(radio);
604		usb_autopm_put_interface(radio->intf);
605	}
606	mutex_unlock(&radio->lock);
607done:
608	return retval;
609}
610
611
612
613/**************************************************************************
614 * Video4Linux Interface
615 **************************************************************************/
616
617/*
618 * si470x_vidioc_querycap - query device capabilities
619 */
620int si470x_vidioc_querycap(struct file *file, void *priv,
621		struct v4l2_capability *capability)
622{
623	struct si470x_device *radio = video_drvdata(file);
624
625	strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
626	strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
627	usb_make_path(radio->usbdev, capability->bus_info,
628			sizeof(capability->bus_info));
629	capability->version = DRIVER_KERNEL_VERSION;
630	capability->capabilities = V4L2_CAP_HW_FREQ_SEEK |
631		V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
632
633	return 0;
634}
635
636
637
638/**************************************************************************
639 * USB Interface
640 **************************************************************************/
641
642/*
643 * si470x_usb_driver_probe - probe for the device
644 */
645static int si470x_usb_driver_probe(struct usb_interface *intf,
646		const struct usb_device_id *id)
647{
648	struct si470x_device *radio;
649	struct usb_host_interface *iface_desc;
650	struct usb_endpoint_descriptor *endpoint;
651	int i, int_end_size, retval = 0;
652	unsigned char version_warning = 0;
653
654	/* private data allocation and initialization */
655	radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
656	if (!radio) {
657		retval = -ENOMEM;
658		goto err_initial;
659	}
660	radio->users = 0;
661	radio->disconnected = 0;
662	radio->usbdev = interface_to_usbdev(intf);
663	radio->intf = intf;
664	mutex_init(&radio->lock);
665
666	iface_desc = intf->cur_altsetting;
667
668	/* Set up interrupt endpoint information. */
669	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
670		endpoint = &iface_desc->endpoint[i].desc;
671		if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ==
672		 USB_DIR_IN) && ((endpoint->bmAttributes &
673		 USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT))
674			radio->int_in_endpoint = endpoint;
675	}
676	if (!radio->int_in_endpoint) {
677		dev_info(&intf->dev, "could not find interrupt in endpoint\n");
678		retval = -EIO;
679		goto err_radio;
680	}
681
682	int_end_size = le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize);
683
684	radio->int_in_buffer = kmalloc(int_end_size, GFP_KERNEL);
685	if (!radio->int_in_buffer) {
686		dev_info(&intf->dev, "could not allocate int_in_buffer");
687		retval = -ENOMEM;
688		goto err_radio;
689	}
690
691	radio->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
692	if (!radio->int_in_urb) {
693		dev_info(&intf->dev, "could not allocate int_in_urb");
694		retval = -ENOMEM;
695		goto err_intbuffer;
696	}
697
698	/* video device allocation and initialization */
699	radio->videodev = video_device_alloc();
700	if (!radio->videodev) {
701		retval = -ENOMEM;
702		goto err_intbuffer;
703	}
704	memcpy(radio->videodev, &si470x_viddev_template,
705			sizeof(si470x_viddev_template));
706	video_set_drvdata(radio->videodev, radio);
707
708	/* get device and chip versions */
709	if (si470x_get_all_registers(radio) < 0) {
710		retval = -EIO;
711		goto err_video;
712	}
713	dev_info(&intf->dev, "DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
714			radio->registers[DEVICEID], radio->registers[CHIPID]);
715	if ((radio->registers[CHIPID] & CHIPID_FIRMWARE) < RADIO_FW_VERSION) {
716		dev_warn(&intf->dev,
717			"This driver is known to work with "
718			"firmware version %hu,\n", RADIO_FW_VERSION);
719		dev_warn(&intf->dev,
720			"but the device has firmware version %hu.\n",
721			radio->registers[CHIPID] & CHIPID_FIRMWARE);
722		version_warning = 1;
723	}
724
725	/* get software and hardware versions */
726	if (si470x_get_scratch_page_versions(radio) < 0) {
727		retval = -EIO;
728		goto err_video;
729	}
730	dev_info(&intf->dev, "software version %d, hardware version %d\n",
731			radio->software_version, radio->hardware_version);
732	if (radio->software_version < RADIO_SW_VERSION) {
733		dev_warn(&intf->dev,
734			"This driver is known to work with "
735			"software version %hu,\n", RADIO_SW_VERSION);
736		dev_warn(&intf->dev,
737			"but the device has software version %hu.\n",
738			radio->software_version);
739		version_warning = 1;
740	}
741	if (radio->hardware_version < RADIO_HW_VERSION) {
742		dev_warn(&intf->dev,
743			"This driver is known to work with "
744			"hardware version %hu,\n", RADIO_HW_VERSION);
745		dev_warn(&intf->dev,
746			"but the device has hardware version %hu.\n",
747			radio->hardware_version);
748		version_warning = 1;
749	}
750
751	/* give out version warning */
752	if (version_warning == 1) {
753		dev_warn(&intf->dev,
754			"If you have some trouble using this driver,\n");
755		dev_warn(&intf->dev,
756			"please report to V4L ML at "
757			"linux-media@vger.kernel.org\n");
758	}
759
760	/* set initial frequency */
761	si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
762
763	/* set led to connect state */
764	si470x_set_led_state(radio, BLINK_GREEN_LED);
765
766	/* rds buffer allocation */
767	radio->buf_size = rds_buf * 3;
768	radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
769	if (!radio->buffer) {
770		retval = -EIO;
771		goto err_video;
772	}
773
774	/* rds buffer configuration */
775	radio->wr_index = 0;
776	radio->rd_index = 0;
777	init_waitqueue_head(&radio->read_queue);
778
779	/* register video device */
780	retval = video_register_device(radio->videodev, VFL_TYPE_RADIO,
781			radio_nr);
782	if (retval) {
783		dev_warn(&intf->dev, "Could not register video device\n");
784		goto err_all;
785	}
786	usb_set_intfdata(intf, radio);
787
788	return 0;
789err_all:
790	kfree(radio->buffer);
791err_video:
792	video_device_release(radio->videodev);
793err_intbuffer:
794	kfree(radio->int_in_buffer);
795err_radio:
796	kfree(radio);
797err_initial:
798	return retval;
799}
800
801
802/*
803 * si470x_usb_driver_suspend - suspend the device
804 */
805static int si470x_usb_driver_suspend(struct usb_interface *intf,
806		pm_message_t message)
807{
808	dev_info(&intf->dev, "suspending now...\n");
809
810	return 0;
811}
812
813
814/*
815 * si470x_usb_driver_resume - resume the device
816 */
817static int si470x_usb_driver_resume(struct usb_interface *intf)
818{
819	dev_info(&intf->dev, "resuming now...\n");
820
821	return 0;
822}
823
824
825/*
826 * si470x_usb_driver_disconnect - disconnect the device
827 */
828static void si470x_usb_driver_disconnect(struct usb_interface *intf)
829{
830	struct si470x_device *radio = usb_get_intfdata(intf);
831
832	mutex_lock(&radio->lock);
833	radio->disconnected = 1;
834	usb_set_intfdata(intf, NULL);
835	if (radio->users == 0) {
836		/* set led to disconnect state */
837		si470x_set_led_state(radio, BLINK_ORANGE_LED);
838
839		/* Free data structures. */
840		usb_free_urb(radio->int_in_urb);
841
842		kfree(radio->int_in_buffer);
843		video_unregister_device(radio->videodev);
844		kfree(radio->buffer);
845		mutex_unlock(&radio->lock);
846		kfree(radio);
847	} else {
848		mutex_unlock(&radio->lock);
849	}
850}
851
852
853/*
854 * si470x_usb_driver - usb driver interface
855 */
856static struct usb_driver si470x_usb_driver = {
857	.name			= DRIVER_NAME,
858	.probe			= si470x_usb_driver_probe,
859	.disconnect		= si470x_usb_driver_disconnect,
860	.suspend		= si470x_usb_driver_suspend,
861	.resume			= si470x_usb_driver_resume,
862	.id_table		= si470x_usb_driver_id_table,
863	.supports_autosuspend	= 1,
864};
865
866
867
868/**************************************************************************
869 * Module Interface
870 **************************************************************************/
871
872/*
873 * si470x_module_init - module init
874 */
875static int __init si470x_module_init(void)
876{
877	printk(KERN_INFO DRIVER_DESC ", Version " DRIVER_VERSION "\n");
878	return usb_register(&si470x_usb_driver);
879}
880
881
882/*
883 * si470x_module_exit - module exit
884 */
885static void __exit si470x_module_exit(void)
886{
887	usb_deregister(&si470x_usb_driver);
888}
889
890
891module_init(si470x_module_init);
892module_exit(si470x_module_exit);
893
894MODULE_LICENSE("GPL");
895MODULE_AUTHOR(DRIVER_AUTHOR);
896MODULE_DESCRIPTION(DRIVER_DESC);
897MODULE_VERSION(DRIVER_VERSION);