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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 /* Axentia ALERT FM USB Receiver */
55 { USB_DEVICE_AND_INTERFACE_INFO(0x12cf, 0x7111, USB_CLASS_HID, 0, 0) },
56 /* Terminating entry */
57 { }
58};
59MODULE_DEVICE_TABLE(usb, si470x_usb_driver_id_table);
60
61
62
63/**************************************************************************
64 * Module Parameters
65 **************************************************************************/
66
67/* Radio Nr */
68static int radio_nr = -1;
69module_param(radio_nr, int, 0444);
70MODULE_PARM_DESC(radio_nr, "Radio Nr");
71
72/* USB timeout */
73static unsigned int usb_timeout = 500;
74module_param(usb_timeout, uint, 0644);
75MODULE_PARM_DESC(usb_timeout, "USB timeout (ms): *500*");
76
77/* RDS buffer blocks */
78static unsigned int rds_buf = 100;
79module_param(rds_buf, uint, 0444);
80MODULE_PARM_DESC(rds_buf, "RDS buffer entries: *100*");
81
82/* RDS maximum block errors */
83static 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 */
88module_param(max_rds_errors, ushort, 0644);
89MODULE_PARM_DESC(max_rds_errors, "RDS maximum block errors: *1*");
90
91
92
93/**************************************************************************
94 * USB HID Reports
95 **************************************************************************/
96
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)
102
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
107
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
112
113/* Report 19: LED state */
114#define LED_REPORT_SIZE 3
115#define LED_REPORT 19
116
117/* Report 19: stream */
118#define STREAM_REPORT_SIZE 3
119#define STREAM_REPORT 19
120
121/* Report 20: scratch */
122#define SCRATCH_PAGE_SIZE 63
123#define SCRATCH_REPORT_SIZE (SCRATCH_PAGE_SIZE + 1)
124#define SCRATCH_REPORT 20
125
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
135
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
139
140
141
142/**************************************************************************
143 * Software/Hardware Versions from Scratch Page
144 **************************************************************************/
145#define RADIO_SW_VERSION_NOT_BOOTLOADABLE 6
146#define RADIO_SW_VERSION 7
147#define RADIO_HW_VERSION 1
148
149
150
151/**************************************************************************
152 * LED State Definitions
153 **************************************************************************/
154#define LED_COMMAND 0x35
155
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
164
165
166
167/**************************************************************************
168 * Stream State Definitions
169 **************************************************************************/
170#define STREAM_COMMAND 0x36
171#define STREAM_VIDPID 0x00
172#define STREAM_AUDIO 0xff
173
174
175
176/**************************************************************************
177 * Bootloader / Flash Commands
178 **************************************************************************/
179
180/* unique id sent to bootloader and required to put into a bootload state */
181#define UNIQUE_BL_ID 0x34
182
183/* mask for the flash data */
184#define FLASH_DATA_MASK 0x55
185
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
195#define BLANK 0xff
196
197/* bootloader command responses */
198#define COMMAND_OK 0x01
199#define COMMAND_FAILED 0x02
200#define COMMAND_PENDING 0x03
201
202
203
204/**************************************************************************
205 * General Driver Functions - REGISTER_REPORTs
206 **************************************************************************/
207
208/*
209 * si470x_get_report - receive a HID report
210 */
211static int si470x_get_report(struct si470x_device *radio, void *buf, int size)
212{
213 unsigned char *report = (unsigned char *) buf;
214 int retval;
215
216 retval = usb_control_msg(radio->usbdev,
217 usb_rcvctrlpipe(radio->usbdev, 0),
218 HID_REQ_GET_REPORT,
219 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
220 report[0], 2,
221 buf, size, usb_timeout);
222
223 if (retval < 0)
224 dev_warn(&radio->intf->dev,
225 "si470x_get_report: usb_control_msg returned %d\n",
226 retval);
227 return retval;
228}
229
230
231/*
232 * si470x_set_report - send a HID report
233 */
234static int si470x_set_report(struct si470x_device *radio, void *buf, int size)
235{
236 unsigned char *report = (unsigned char *) buf;
237 int retval;
238
239 retval = usb_control_msg(radio->usbdev,
240 usb_sndctrlpipe(radio->usbdev, 0),
241 HID_REQ_SET_REPORT,
242 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
243 report[0], 2,
244 buf, size, usb_timeout);
245
246 if (retval < 0)
247 dev_warn(&radio->intf->dev,
248 "si470x_set_report: usb_control_msg returned %d\n",
249 retval);
250 return retval;
251}
252
253
254/*
255 * si470x_get_register - read register
256 */
257int si470x_get_register(struct si470x_device *radio, int regnr)
258{
259 unsigned char buf[REGISTER_REPORT_SIZE];
260 int retval;
261
262 buf[0] = REGISTER_REPORT(regnr);
263
264 retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
265
266 if (retval >= 0)
267 radio->registers[regnr] = get_unaligned_be16(&buf[1]);
268
269 return (retval < 0) ? -EINVAL : 0;
270}
271
272
273/*
274 * si470x_set_register - write register
275 */
276int si470x_set_register(struct si470x_device *radio, int regnr)
277{
278 unsigned char buf[REGISTER_REPORT_SIZE];
279 int retval;
280
281 buf[0] = REGISTER_REPORT(regnr);
282 put_unaligned_be16(radio->registers[regnr], &buf[1]);
283
284 retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
285
286 return (retval < 0) ? -EINVAL : 0;
287}
288
289
290
291/**************************************************************************
292 * General Driver Functions - ENTIRE_REPORT
293 **************************************************************************/
294
295/*
296 * si470x_get_all_registers - read entire registers
297 */
298static int si470x_get_all_registers(struct si470x_device *radio)
299{
300 unsigned char buf[ENTIRE_REPORT_SIZE];
301 int retval;
302 unsigned char regnr;
303
304 buf[0] = ENTIRE_REPORT;
305
306 retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
307
308 if (retval >= 0)
309 for (regnr = 0; regnr < RADIO_REGISTER_NUM; regnr++)
310 radio->registers[regnr] = get_unaligned_be16(
311 &buf[regnr * RADIO_REGISTER_SIZE + 1]);
312
313 return (retval < 0) ? -EINVAL : 0;
314}
315
316
317
318/**************************************************************************
319 * General Driver Functions - LED_REPORT
320 **************************************************************************/
321
322/*
323 * si470x_set_led_state - sets the led state
324 */
325static int si470x_set_led_state(struct si470x_device *radio,
326 unsigned char led_state)
327{
328 unsigned char buf[LED_REPORT_SIZE];
329 int retval;
330
331 buf[0] = LED_REPORT;
332 buf[1] = LED_COMMAND;
333 buf[2] = led_state;
334
335 retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
336
337 return (retval < 0) ? -EINVAL : 0;
338}
339
340
341
342/**************************************************************************
343 * General Driver Functions - SCRATCH_REPORT
344 **************************************************************************/
345
346/*
347 * si470x_get_scratch_versions - gets the scratch page and version infos
348 */
349static int si470x_get_scratch_page_versions(struct si470x_device *radio)
350{
351 unsigned char buf[SCRATCH_REPORT_SIZE];
352 int retval;
353
354 buf[0] = SCRATCH_REPORT;
355
356 retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
357
358 if (retval < 0)
359 dev_warn(&radio->intf->dev, "si470x_get_scratch: "
360 "si470x_get_report returned %d\n", retval);
361 else {
362 radio->software_version = buf[1];
363 radio->hardware_version = buf[2];
364 }
365
366 return (retval < 0) ? -EINVAL : 0;
367}
368
369
370
371/**************************************************************************
372 * RDS Driver Functions
373 **************************************************************************/
374
375/*
376 * si470x_int_in_callback - rds callback and processing function
377 *
378 * TODO: do we need to use mutex locks in some sections?
379 */
380static void si470x_int_in_callback(struct urb *urb)
381{
382 struct si470x_device *radio = urb->context;
383 int retval;
384 unsigned char regnr;
385 unsigned char blocknum;
386 unsigned short bler; /* rds block errors */
387 unsigned short rds;
388 unsigned char tmpbuf[3];
389
390 if (urb->status) {
391 if (urb->status == -ENOENT ||
392 urb->status == -ECONNRESET ||
393 urb->status == -ESHUTDOWN) {
394 return;
395 } else {
396 dev_warn(&radio->intf->dev,
397 "non-zero urb status (%d)\n", urb->status);
398 goto resubmit; /* Maybe we can recover. */
399 }
400 }
401
402 if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
403 goto resubmit;
404
405 if (urb->actual_length > 0) {
406 /* Update RDS registers with URB data */
407 for (regnr = 0; regnr < RDS_REGISTER_NUM; regnr++)
408 radio->registers[STATUSRSSI + regnr] =
409 get_unaligned_be16(&radio->int_in_buffer[
410 regnr * RADIO_REGISTER_SIZE + 1]);
411 /* get rds blocks */
412 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0) {
413 /* No RDS group ready, better luck next time */
414 goto resubmit;
415 }
416 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSS) == 0) {
417 /* RDS decoder not synchronized */
418 goto resubmit;
419 }
420 for (blocknum = 0; blocknum < 4; blocknum++) {
421 switch (blocknum) {
422 default:
423 bler = (radio->registers[STATUSRSSI] &
424 STATUSRSSI_BLERA) >> 9;
425 rds = radio->registers[RDSA];
426 break;
427 case 1:
428 bler = (radio->registers[READCHAN] &
429 READCHAN_BLERB) >> 14;
430 rds = radio->registers[RDSB];
431 break;
432 case 2:
433 bler = (radio->registers[READCHAN] &
434 READCHAN_BLERC) >> 12;
435 rds = radio->registers[RDSC];
436 break;
437 case 3:
438 bler = (radio->registers[READCHAN] &
439 READCHAN_BLERD) >> 10;
440 rds = radio->registers[RDSD];
441 break;
442 };
443
444 /* Fill the V4L2 RDS buffer */
445 put_unaligned_le16(rds, &tmpbuf);
446 tmpbuf[2] = blocknum; /* offset name */
447 tmpbuf[2] |= blocknum << 3; /* received offset */
448 if (bler > max_rds_errors)
449 tmpbuf[2] |= 0x80; /* uncorrectable errors */
450 else if (bler > 0)
451 tmpbuf[2] |= 0x40; /* corrected error(s) */
452
453 /* copy RDS block to internal buffer */
454 memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
455 radio->wr_index += 3;
456
457 /* wrap write pointer */
458 if (radio->wr_index >= radio->buf_size)
459 radio->wr_index = 0;
460
461 /* check for overflow */
462 if (radio->wr_index == radio->rd_index) {
463 /* increment and wrap read pointer */
464 radio->rd_index += 3;
465 if (radio->rd_index >= radio->buf_size)
466 radio->rd_index = 0;
467 }
468 }
469 if (radio->wr_index != radio->rd_index)
470 wake_up_interruptible(&radio->read_queue);
471 }
472
473resubmit:
474 /* Resubmit if we're still running. */
475 if (radio->int_in_running && radio->usbdev) {
476 retval = usb_submit_urb(radio->int_in_urb, GFP_ATOMIC);
477 if (retval) {
478 dev_warn(&radio->intf->dev,
479 "resubmitting urb failed (%d)", retval);
480 radio->int_in_running = 0;
481 }
482 }
483}
484
485
486int si470x_fops_open(struct file *file)
487{
488 return v4l2_fh_open(file);
489}
490
491int si470x_fops_release(struct file *file)
492{
493 return v4l2_fh_release(file);
494}
495
496static void si470x_usb_release(struct v4l2_device *v4l2_dev)
497{
498 struct si470x_device *radio =
499 container_of(v4l2_dev, struct si470x_device, v4l2_dev);
500
501 usb_free_urb(radio->int_in_urb);
502 v4l2_ctrl_handler_free(&radio->hdl);
503 v4l2_device_unregister(&radio->v4l2_dev);
504 kfree(radio->int_in_buffer);
505 kfree(radio->buffer);
506 kfree(radio);
507}
508
509
510/**************************************************************************
511 * Video4Linux Interface
512 **************************************************************************/
513
514/*
515 * si470x_vidioc_querycap - query device capabilities
516 */
517int si470x_vidioc_querycap(struct file *file, void *priv,
518 struct v4l2_capability *capability)
519{
520 struct si470x_device *radio = video_drvdata(file);
521
522 strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
523 strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
524 usb_make_path(radio->usbdev, capability->bus_info,
525 sizeof(capability->bus_info));
526 capability->device_caps = V4L2_CAP_HW_FREQ_SEEK |
527 V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
528 capability->capabilities = capability->device_caps | V4L2_CAP_DEVICE_CAPS;
529 return 0;
530}
531
532
533static int si470x_start_usb(struct si470x_device *radio)
534{
535 int retval;
536
537 /* start radio */
538 retval = si470x_start(radio);
539 if (retval < 0)
540 return retval;
541
542 v4l2_ctrl_handler_setup(&radio->hdl);
543
544 /* initialize interrupt urb */
545 usb_fill_int_urb(radio->int_in_urb, radio->usbdev,
546 usb_rcvintpipe(radio->usbdev,
547 radio->int_in_endpoint->bEndpointAddress),
548 radio->int_in_buffer,
549 le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize),
550 si470x_int_in_callback,
551 radio,
552 radio->int_in_endpoint->bInterval);
553
554 radio->int_in_running = 1;
555 mb();
556
557 retval = usb_submit_urb(radio->int_in_urb, GFP_KERNEL);
558 if (retval) {
559 dev_info(&radio->intf->dev,
560 "submitting int urb failed (%d)\n", retval);
561 radio->int_in_running = 0;
562 }
563 return retval;
564}
565
566/**************************************************************************
567 * USB Interface
568 **************************************************************************/
569
570/*
571 * si470x_usb_driver_probe - probe for the device
572 */
573static int si470x_usb_driver_probe(struct usb_interface *intf,
574 const struct usb_device_id *id)
575{
576 struct si470x_device *radio;
577 struct usb_host_interface *iface_desc;
578 struct usb_endpoint_descriptor *endpoint;
579 int i, int_end_size, retval = 0;
580 unsigned char version_warning = 0;
581
582 /* private data allocation and initialization */
583 radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
584 if (!radio) {
585 retval = -ENOMEM;
586 goto err_initial;
587 }
588 radio->usbdev = interface_to_usbdev(intf);
589 radio->intf = intf;
590 mutex_init(&radio->lock);
591
592 iface_desc = intf->cur_altsetting;
593
594 /* Set up interrupt endpoint information. */
595 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
596 endpoint = &iface_desc->endpoint[i].desc;
597 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ==
598 USB_DIR_IN) && ((endpoint->bmAttributes &
599 USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT))
600 radio->int_in_endpoint = endpoint;
601 }
602 if (!radio->int_in_endpoint) {
603 dev_info(&intf->dev, "could not find interrupt in endpoint\n");
604 retval = -EIO;
605 goto err_radio;
606 }
607
608 int_end_size = le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize);
609
610 radio->int_in_buffer = kmalloc(int_end_size, GFP_KERNEL);
611 if (!radio->int_in_buffer) {
612 dev_info(&intf->dev, "could not allocate int_in_buffer");
613 retval = -ENOMEM;
614 goto err_radio;
615 }
616
617 radio->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
618 if (!radio->int_in_urb) {
619 dev_info(&intf->dev, "could not allocate int_in_urb");
620 retval = -ENOMEM;
621 goto err_intbuffer;
622 }
623
624 radio->v4l2_dev.release = si470x_usb_release;
625 retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
626 if (retval < 0) {
627 dev_err(&intf->dev, "couldn't register v4l2_device\n");
628 goto err_urb;
629 }
630
631 v4l2_ctrl_handler_init(&radio->hdl, 2);
632 v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
633 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
634 v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
635 V4L2_CID_AUDIO_VOLUME, 0, 15, 1, 15);
636 if (radio->hdl.error) {
637 retval = radio->hdl.error;
638 dev_err(&intf->dev, "couldn't register control\n");
639 goto err_dev;
640 }
641 radio->videodev = si470x_viddev_template;
642 radio->videodev.ctrl_handler = &radio->hdl;
643 radio->videodev.lock = &radio->lock;
644 radio->videodev.v4l2_dev = &radio->v4l2_dev;
645 radio->videodev.release = video_device_release_empty;
646 set_bit(V4L2_FL_USE_FH_PRIO, &radio->videodev.flags);
647 video_set_drvdata(&radio->videodev, radio);
648
649 /* get device and chip versions */
650 if (si470x_get_all_registers(radio) < 0) {
651 retval = -EIO;
652 goto err_ctrl;
653 }
654 dev_info(&intf->dev, "DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
655 radio->registers[DEVICEID], radio->registers[CHIPID]);
656 if ((radio->registers[CHIPID] & CHIPID_FIRMWARE) < RADIO_FW_VERSION) {
657 dev_warn(&intf->dev,
658 "This driver is known to work with "
659 "firmware version %hu,\n", RADIO_FW_VERSION);
660 dev_warn(&intf->dev,
661 "but the device has firmware version %hu.\n",
662 radio->registers[CHIPID] & CHIPID_FIRMWARE);
663 version_warning = 1;
664 }
665
666 /* get software and hardware versions */
667 if (si470x_get_scratch_page_versions(radio) < 0) {
668 retval = -EIO;
669 goto err_ctrl;
670 }
671 dev_info(&intf->dev, "software version %d, hardware version %d\n",
672 radio->software_version, radio->hardware_version);
673 if (radio->software_version < RADIO_SW_VERSION) {
674 dev_warn(&intf->dev,
675 "This driver is known to work with "
676 "software version %hu,\n", RADIO_SW_VERSION);
677 dev_warn(&intf->dev,
678 "but the device has software version %hu.\n",
679 radio->software_version);
680 version_warning = 1;
681 }
682 if (radio->hardware_version < RADIO_HW_VERSION) {
683 dev_warn(&intf->dev,
684 "This driver is known to work with "
685 "hardware version %hu,\n", RADIO_HW_VERSION);
686 dev_warn(&intf->dev,
687 "but the device has hardware version %hu.\n",
688 radio->hardware_version);
689 version_warning = 1;
690 }
691
692 /* give out version warning */
693 if (version_warning == 1) {
694 dev_warn(&intf->dev,
695 "If you have some trouble using this driver,\n");
696 dev_warn(&intf->dev,
697 "please report to V4L ML at "
698 "linux-media@vger.kernel.org\n");
699 }
700
701 /* set initial frequency */
702 si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
703
704 /* set led to connect state */
705 si470x_set_led_state(radio, BLINK_GREEN_LED);
706
707 /* rds buffer allocation */
708 radio->buf_size = rds_buf * 3;
709 radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
710 if (!radio->buffer) {
711 retval = -EIO;
712 goto err_ctrl;
713 }
714
715 /* rds buffer configuration */
716 radio->wr_index = 0;
717 radio->rd_index = 0;
718 init_waitqueue_head(&radio->read_queue);
719 usb_set_intfdata(intf, radio);
720
721 /* start radio */
722 retval = si470x_start_usb(radio);
723 if (retval < 0)
724 goto err_all;
725
726 /* register video device */
727 retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO,
728 radio_nr);
729 if (retval) {
730 dev_err(&intf->dev, "Could not register video device\n");
731 goto err_all;
732 }
733
734 return 0;
735err_all:
736 kfree(radio->buffer);
737err_ctrl:
738 v4l2_ctrl_handler_free(&radio->hdl);
739err_dev:
740 v4l2_device_unregister(&radio->v4l2_dev);
741err_urb:
742 usb_free_urb(radio->int_in_urb);
743err_intbuffer:
744 kfree(radio->int_in_buffer);
745err_radio:
746 kfree(radio);
747err_initial:
748 return retval;
749}
750
751
752/*
753 * si470x_usb_driver_suspend - suspend the device
754 */
755static int si470x_usb_driver_suspend(struct usb_interface *intf,
756 pm_message_t message)
757{
758 struct si470x_device *radio = usb_get_intfdata(intf);
759
760 dev_info(&intf->dev, "suspending now...\n");
761
762 /* shutdown interrupt handler */
763 if (radio->int_in_running) {
764 radio->int_in_running = 0;
765 if (radio->int_in_urb)
766 usb_kill_urb(radio->int_in_urb);
767 }
768
769 /* cancel read processes */
770 wake_up_interruptible(&radio->read_queue);
771
772 /* stop radio */
773 si470x_stop(radio);
774 return 0;
775}
776
777
778/*
779 * si470x_usb_driver_resume - resume the device
780 */
781static int si470x_usb_driver_resume(struct usb_interface *intf)
782{
783 struct si470x_device *radio = usb_get_intfdata(intf);
784
785 dev_info(&intf->dev, "resuming now...\n");
786
787 /* start radio */
788 return si470x_start_usb(radio);
789}
790
791
792/*
793 * si470x_usb_driver_disconnect - disconnect the device
794 */
795static void si470x_usb_driver_disconnect(struct usb_interface *intf)
796{
797 struct si470x_device *radio = usb_get_intfdata(intf);
798
799 mutex_lock(&radio->lock);
800 v4l2_device_disconnect(&radio->v4l2_dev);
801 video_unregister_device(&radio->videodev);
802 usb_set_intfdata(intf, NULL);
803 mutex_unlock(&radio->lock);
804 v4l2_device_put(&radio->v4l2_dev);
805}
806
807
808/*
809 * si470x_usb_driver - usb driver interface
810 *
811 * A note on suspend/resume: this driver had only empty suspend/resume
812 * functions, and when I tried to test suspend/resume it always disconnected
813 * instead of resuming (using my ADS InstantFM stick). So I've decided to
814 * remove these callbacks until someone else with better hardware can
815 * implement and test this.
816 */
817static struct usb_driver si470x_usb_driver = {
818 .name = DRIVER_NAME,
819 .probe = si470x_usb_driver_probe,
820 .disconnect = si470x_usb_driver_disconnect,
821 .suspend = si470x_usb_driver_suspend,
822 .resume = si470x_usb_driver_resume,
823 .reset_resume = si470x_usb_driver_resume,
824 .id_table = si470x_usb_driver_id_table,
825};
826
827module_usb_driver(si470x_usb_driver);
828
829MODULE_LICENSE("GPL");
830MODULE_AUTHOR(DRIVER_AUTHOR);
831MODULE_DESCRIPTION(DRIVER_DESC);
832MODULE_VERSION(DRIVER_VERSION);