Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

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

  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 */
 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 */
 57         { }
 58 };
 59 MODULE_DEVICE_TABLE(usb, si470x_usb_driver_id_table);
 60 
 61 
 62 
 63 /**************************************************************************
 64  * Module Parameters
 65  **************************************************************************/
 66 
 67 /* Radio Nr */
 68 static int radio_nr = -1;
 69 module_param(radio_nr, int, 0444);
 70 MODULE_PARM_DESC(radio_nr, "Radio Nr");
 71 
 72 /* USB timeout */
 73 static unsigned int usb_timeout = 500;
 74 module_param(usb_timeout, uint, 0644);
 75 MODULE_PARM_DESC(usb_timeout, "USB timeout (ms): *500*");
 76 
 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*");
 81 
 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*");
 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 #define MAX_REPORT_SIZE         64
141 
142 
143 
144 /**************************************************************************
145  * Software/Hardware Versions from Scratch Page
146  **************************************************************************/
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  */
211 static int si470x_get_report(struct si470x_device *radio, void *buf, int size)
212 {
213         unsigned char *report = 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  */
234 static int si470x_set_report(struct si470x_device *radio, void *buf, int size)
235 {
236         unsigned char *report = 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  */
257 int si470x_get_register(struct si470x_device *radio, int regnr)
258 {
259         int retval;
260 
261         radio->usb_buf[0] = REGISTER_REPORT(regnr);
262 
263         retval = si470x_get_report(radio, radio->usb_buf, REGISTER_REPORT_SIZE);
264 
265         if (retval >= 0)
266                 radio->registers[regnr] = get_unaligned_be16(&radio->usb_buf[1]);
267 
268         return (retval < 0) ? -EINVAL : 0;
269 }
270 
271 
272 /*
273  * si470x_set_register - write register
274  */
275 int si470x_set_register(struct si470x_device *radio, int regnr)
276 {
277         int retval;
278 
279         radio->usb_buf[0] = REGISTER_REPORT(regnr);
280         put_unaligned_be16(radio->registers[regnr], &radio->usb_buf[1]);
281 
282         retval = si470x_set_report(radio, radio->usb_buf, REGISTER_REPORT_SIZE);
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  */
296 static int si470x_get_all_registers(struct si470x_device *radio)
297 {
298         int retval;
299         unsigned char regnr;
300 
301         radio->usb_buf[0] = ENTIRE_REPORT;
302 
303         retval = si470x_get_report(radio, radio->usb_buf, ENTIRE_REPORT_SIZE);
304 
305         if (retval >= 0)
306                 for (regnr = 0; regnr < RADIO_REGISTER_NUM; regnr++)
307                         radio->registers[regnr] = get_unaligned_be16(
308                                 &radio->usb_buf[regnr * RADIO_REGISTER_SIZE + 1]);
309 
310         return (retval < 0) ? -EINVAL : 0;
311 }
312 
313 
314 
315 /**************************************************************************
316  * General Driver Functions - LED_REPORT
317  **************************************************************************/
318 
319 /*
320  * si470x_set_led_state - sets the led state
321  */
322 static int si470x_set_led_state(struct si470x_device *radio,
323                 unsigned char led_state)
324 {
325         int retval;
326 
327         radio->usb_buf[0] = LED_REPORT;
328         radio->usb_buf[1] = LED_COMMAND;
329         radio->usb_buf[2] = led_state;
330 
331         retval = si470x_set_report(radio, radio->usb_buf, LED_REPORT_SIZE);
332 
333         return (retval < 0) ? -EINVAL : 0;
334 }
335 
336 
337 
338 /**************************************************************************
339  * General Driver Functions - SCRATCH_REPORT
340  **************************************************************************/
341 
342 /*
343  * si470x_get_scratch_versions - gets the scratch page and version infos
344  */
345 static int si470x_get_scratch_page_versions(struct si470x_device *radio)
346 {
347         int retval;
348 
349         radio->usb_buf[0] = SCRATCH_REPORT;
350 
351         retval = si470x_get_report(radio, radio->usb_buf, SCRATCH_REPORT_SIZE);
352 
353         if (retval < 0)
354                 dev_warn(&radio->intf->dev, "si470x_get_scratch: "
355                         "si470x_get_report returned %d\n", retval);
356         else {
357                 radio->software_version = radio->usb_buf[1];
358                 radio->hardware_version = radio->usb_buf[2];
359         }
360 
361         return (retval < 0) ? -EINVAL : 0;
362 }
363 
364 
365 
366 /**************************************************************************
367  * RDS Driver Functions
368  **************************************************************************/
369 
370 /*
371  * si470x_int_in_callback - rds callback and processing function
372  *
373  * TODO: do we need to use mutex locks in some sections?
374  */
375 static void si470x_int_in_callback(struct urb *urb)
376 {
377         struct si470x_device *radio = urb->context;
378         int retval;
379         unsigned char regnr;
380         unsigned char blocknum;
381         unsigned short bler; /* rds block errors */
382         unsigned short rds;
383         unsigned char tmpbuf[3];
384 
385         if (urb->status) {
386                 if (urb->status == -ENOENT ||
387                                 urb->status == -ECONNRESET ||
388                                 urb->status == -ESHUTDOWN) {
389                         return;
390                 } else {
391                         dev_warn(&radio->intf->dev,
392                          "non-zero urb status (%d)\n", urb->status);
393                         goto resubmit; /* Maybe we can recover. */
394                 }
395         }
396 
397         /* Sometimes the device returns len 0 packets */
398         if (urb->actual_length != RDS_REPORT_SIZE)
399                 goto resubmit;
400 
401         radio->registers[STATUSRSSI] =
402                 get_unaligned_be16(&radio->int_in_buffer[1]);
403 
404         if (radio->registers[STATUSRSSI] & STATUSRSSI_STC)
405                 complete(&radio->completion);
406 
407         if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS)) {
408                 /* Update RDS registers with URB data */
409                 for (regnr = 1; regnr < RDS_REGISTER_NUM; regnr++)
410                         radio->registers[STATUSRSSI + regnr] =
411                             get_unaligned_be16(&radio->int_in_buffer[
412                                 regnr * RADIO_REGISTER_SIZE + 1]);
413                 /* get rds blocks */
414                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0) {
415                         /* No RDS group ready, better luck next time */
416                         goto resubmit;
417                 }
418                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSS) == 0) {
419                         /* RDS decoder not synchronized */
420                         goto resubmit;
421                 }
422                 for (blocknum = 0; blocknum < 4; blocknum++) {
423                         switch (blocknum) {
424                         default:
425                                 bler = (radio->registers[STATUSRSSI] &
426                                                 STATUSRSSI_BLERA) >> 9;
427                                 rds = radio->registers[RDSA];
428                                 break;
429                         case 1:
430                                 bler = (radio->registers[READCHAN] &
431                                                 READCHAN_BLERB) >> 14;
432                                 rds = radio->registers[RDSB];
433                                 break;
434                         case 2:
435                                 bler = (radio->registers[READCHAN] &
436                                                 READCHAN_BLERC) >> 12;
437                                 rds = radio->registers[RDSC];
438                                 break;
439                         case 3:
440                                 bler = (radio->registers[READCHAN] &
441                                                 READCHAN_BLERD) >> 10;
442                                 rds = radio->registers[RDSD];
443                                 break;
444                         }
445 
446                         /* Fill the V4L2 RDS buffer */
447                         put_unaligned_le16(rds, &tmpbuf);
448                         tmpbuf[2] = blocknum;           /* offset name */
449                         tmpbuf[2] |= blocknum << 3;     /* received offset */
450                         if (bler > max_rds_errors)
451                                 tmpbuf[2] |= 0x80; /* uncorrectable errors */
452                         else if (bler > 0)
453                                 tmpbuf[2] |= 0x40; /* corrected error(s) */
454 
455                         /* copy RDS block to internal buffer */
456                         memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
457                         radio->wr_index += 3;
458 
459                         /* wrap write pointer */
460                         if (radio->wr_index >= radio->buf_size)
461                                 radio->wr_index = 0;
462 
463                         /* check for overflow */
464                         if (radio->wr_index == radio->rd_index) {
465                                 /* increment and wrap read pointer */
466                                 radio->rd_index += 3;
467                                 if (radio->rd_index >= radio->buf_size)
468                                         radio->rd_index = 0;
469                         }
470                 }
471                 if (radio->wr_index != radio->rd_index)
472                         wake_up_interruptible(&radio->read_queue);
473         }
474 
475 resubmit:
476         /* Resubmit if we're still running. */
477         if (radio->int_in_running && radio->usbdev) {
478                 retval = usb_submit_urb(radio->int_in_urb, GFP_ATOMIC);
479                 if (retval) {
480                         dev_warn(&radio->intf->dev,
481                                "resubmitting urb failed (%d)", retval);
482                         radio->int_in_running = 0;
483                 }
484         }
485         radio->status_rssi_auto_update = radio->int_in_running;
486 }
487 
488 
489 int si470x_fops_open(struct file *file)
490 {
491         return v4l2_fh_open(file);
492 }
493 
494 int si470x_fops_release(struct file *file)
495 {
496         return v4l2_fh_release(file);
497 }
498 
499 static void si470x_usb_release(struct v4l2_device *v4l2_dev)
500 {
501         struct si470x_device *radio =
502                 container_of(v4l2_dev, struct si470x_device, v4l2_dev);
503 
504         usb_free_urb(radio->int_in_urb);
505         v4l2_ctrl_handler_free(&radio->hdl);
506         v4l2_device_unregister(&radio->v4l2_dev);
507         kfree(radio->int_in_buffer);
508         kfree(radio->buffer);
509         kfree(radio->usb_buf);
510         kfree(radio);
511 }
512 
513 
514 /**************************************************************************
515  * Video4Linux Interface
516  **************************************************************************/
517 
518 /*
519  * si470x_vidioc_querycap - query device capabilities
520  */
521 int si470x_vidioc_querycap(struct file *file, void *priv,
522                 struct v4l2_capability *capability)
523 {
524         struct si470x_device *radio = video_drvdata(file);
525 
526         strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
527         strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
528         usb_make_path(radio->usbdev, capability->bus_info,
529                         sizeof(capability->bus_info));
530         capability->device_caps = V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_READWRITE |
531                 V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
532         capability->capabilities = capability->device_caps | V4L2_CAP_DEVICE_CAPS;
533         return 0;
534 }
535 
536 
537 static int si470x_start_usb(struct si470x_device *radio)
538 {
539         int retval;
540 
541         /* initialize interrupt urb */
542         usb_fill_int_urb(radio->int_in_urb, radio->usbdev,
543                         usb_rcvintpipe(radio->usbdev,
544                                 radio->int_in_endpoint->bEndpointAddress),
545                         radio->int_in_buffer,
546                         le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize),
547                         si470x_int_in_callback,
548                         radio,
549                         radio->int_in_endpoint->bInterval);
550 
551         radio->int_in_running = 1;
552         mb();
553 
554         retval = usb_submit_urb(radio->int_in_urb, GFP_KERNEL);
555         if (retval) {
556                 dev_info(&radio->intf->dev,
557                                 "submitting int urb failed (%d)\n", retval);
558                 radio->int_in_running = 0;
559         }
560         radio->status_rssi_auto_update = radio->int_in_running;
561 
562         /* start radio */
563         retval = si470x_start(radio);
564         if (retval < 0)
565                 return retval;
566 
567         v4l2_ctrl_handler_setup(&radio->hdl);
568 
569         return retval;
570 }
571 
572 /**************************************************************************
573  * USB Interface
574  **************************************************************************/
575 
576 /*
577  * si470x_usb_driver_probe - probe for the device
578  */
579 static int si470x_usb_driver_probe(struct usb_interface *intf,
580                 const struct usb_device_id *id)
581 {
582         struct si470x_device *radio;
583         struct usb_host_interface *iface_desc;
584         struct usb_endpoint_descriptor *endpoint;
585         int i, int_end_size, retval = 0;
586         unsigned char version_warning = 0;
587 
588         /* private data allocation and initialization */
589         radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
590         if (!radio) {
591                 retval = -ENOMEM;
592                 goto err_initial;
593         }
594         radio->usb_buf = kmalloc(MAX_REPORT_SIZE, GFP_KERNEL);
595         if (radio->usb_buf == NULL) {
596                 retval = -ENOMEM;
597                 goto err_radio;
598         }
599         radio->usbdev = interface_to_usbdev(intf);
600         radio->intf = intf;
601         radio->band = 1; /* Default to 76 - 108 MHz */
602         mutex_init(&radio->lock);
603         init_completion(&radio->completion);
604 
605         iface_desc = intf->cur_altsetting;
606 
607         /* Set up interrupt endpoint information. */
608         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
609                 endpoint = &iface_desc->endpoint[i].desc;
610                 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ==
611                  USB_DIR_IN) && ((endpoint->bmAttributes &
612                  USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT))
613                         radio->int_in_endpoint = endpoint;
614         }
615         if (!radio->int_in_endpoint) {
616                 dev_info(&intf->dev, "could not find interrupt in endpoint\n");
617                 retval = -EIO;
618                 goto err_usbbuf;
619         }
620 
621         int_end_size = le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize);
622 
623         radio->int_in_buffer = kmalloc(int_end_size, GFP_KERNEL);
624         if (!radio->int_in_buffer) {
625                 dev_info(&intf->dev, "could not allocate int_in_buffer");
626                 retval = -ENOMEM;
627                 goto err_usbbuf;
628         }
629 
630         radio->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
631         if (!radio->int_in_urb) {
632                 dev_info(&intf->dev, "could not allocate int_in_urb");
633                 retval = -ENOMEM;
634                 goto err_intbuffer;
635         }
636 
637         radio->v4l2_dev.release = si470x_usb_release;
638 
639         /*
640          * The si470x SiLabs reference design uses the same USB IDs as
641          * 'Thanko's Raremono' si4734 based receiver. So check here which we
642          * have: attempt to read the device ID from the si470x: the lower 12
643          * bits should be 0x0242 for the si470x.
644          *
645          * We use this check to determine which device we are dealing with.
646          */
647         if (id->idVendor == 0x10c4 && id->idProduct == 0x818a) {
648                 retval = usb_control_msg(radio->usbdev,
649                                 usb_rcvctrlpipe(radio->usbdev, 0),
650                                 HID_REQ_GET_REPORT,
651                                 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
652                                 1, 2,
653                                 radio->usb_buf, 3, 500);
654                 if (retval != 3 ||
655                     (get_unaligned_be16(&radio->usb_buf[1]) & 0xfff) != 0x0242) {
656                         dev_info(&intf->dev, "this is not a si470x device.\n");
657                         retval = -ENODEV;
658                         goto err_urb;
659                 }
660         }
661 
662         retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
663         if (retval < 0) {
664                 dev_err(&intf->dev, "couldn't register v4l2_device\n");
665                 goto err_urb;
666         }
667 
668         v4l2_ctrl_handler_init(&radio->hdl, 2);
669         v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
670                           V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
671         v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
672                           V4L2_CID_AUDIO_VOLUME, 0, 15, 1, 15);
673         if (radio->hdl.error) {
674                 retval = radio->hdl.error;
675                 dev_err(&intf->dev, "couldn't register control\n");
676                 goto err_dev;
677         }
678         radio->videodev = si470x_viddev_template;
679         radio->videodev.ctrl_handler = &radio->hdl;
680         radio->videodev.lock = &radio->lock;
681         radio->videodev.v4l2_dev = &radio->v4l2_dev;
682         radio->videodev.release = video_device_release_empty;
683         video_set_drvdata(&radio->videodev, radio);
684 
685         /* get device and chip versions */
686         if (si470x_get_all_registers(radio) < 0) {
687                 retval = -EIO;
688                 goto err_ctrl;
689         }
690         dev_info(&intf->dev, "DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
691                         radio->registers[DEVICEID], radio->registers[CHIPID]);
692         if ((radio->registers[CHIPID] & CHIPID_FIRMWARE) < RADIO_FW_VERSION) {
693                 dev_warn(&intf->dev,
694                         "This driver is known to work with "
695                         "firmware version %hu,\n", RADIO_FW_VERSION);
696                 dev_warn(&intf->dev,
697                         "but the device has firmware version %hu.\n",
698                         radio->registers[CHIPID] & CHIPID_FIRMWARE);
699                 version_warning = 1;
700         }
701 
702         /* get software and hardware versions */
703         if (si470x_get_scratch_page_versions(radio) < 0) {
704                 retval = -EIO;
705                 goto err_ctrl;
706         }
707         dev_info(&intf->dev, "software version %d, hardware version %d\n",
708                         radio->software_version, radio->hardware_version);
709         if (radio->hardware_version < RADIO_HW_VERSION) {
710                 dev_warn(&intf->dev,
711                         "This driver is known to work with "
712                         "hardware version %hu,\n", RADIO_HW_VERSION);
713                 dev_warn(&intf->dev,
714                         "but the device has hardware version %hu.\n",
715                         radio->hardware_version);
716                 version_warning = 1;
717         }
718 
719         /* give out version warning */
720         if (version_warning == 1) {
721                 dev_warn(&intf->dev,
722                         "If you have some trouble using this driver,\n");
723                 dev_warn(&intf->dev,
724                         "please report to V4L ML at "
725                         "linux-media@vger.kernel.org\n");
726         }
727 
728         /* set led to connect state */
729         si470x_set_led_state(radio, BLINK_GREEN_LED);
730 
731         /* rds buffer allocation */
732         radio->buf_size = rds_buf * 3;
733         radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
734         if (!radio->buffer) {
735                 retval = -EIO;
736                 goto err_ctrl;
737         }
738 
739         /* rds buffer configuration */
740         radio->wr_index = 0;
741         radio->rd_index = 0;
742         init_waitqueue_head(&radio->read_queue);
743         usb_set_intfdata(intf, radio);
744 
745         /* start radio */
746         retval = si470x_start_usb(radio);
747         if (retval < 0)
748                 goto err_all;
749 
750         /* set initial frequency */
751         si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
752 
753         /* register video device */
754         retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO,
755                         radio_nr);
756         if (retval) {
757                 dev_err(&intf->dev, "Could not register video device\n");
758                 goto err_all;
759         }
760 
761         return 0;
762 err_all:
763         kfree(radio->buffer);
764 err_ctrl:
765         v4l2_ctrl_handler_free(&radio->hdl);
766 err_dev:
767         v4l2_device_unregister(&radio->v4l2_dev);
768 err_urb:
769         usb_free_urb(radio->int_in_urb);
770 err_intbuffer:
771         kfree(radio->int_in_buffer);
772 err_usbbuf:
773         kfree(radio->usb_buf);
774 err_radio:
775         kfree(radio);
776 err_initial:
777         return retval;
778 }
779 
780 
781 /*
782  * si470x_usb_driver_suspend - suspend the device
783  */
784 static int si470x_usb_driver_suspend(struct usb_interface *intf,
785                 pm_message_t message)
786 {
787         struct si470x_device *radio = usb_get_intfdata(intf);
788 
789         dev_info(&intf->dev, "suspending now...\n");
790 
791         /* shutdown interrupt handler */
792         if (radio->int_in_running) {
793                 radio->int_in_running = 0;
794                 if (radio->int_in_urb)
795                         usb_kill_urb(radio->int_in_urb);
796         }
797 
798         /* cancel read processes */
799         wake_up_interruptible(&radio->read_queue);
800 
801         /* stop radio */
802         si470x_stop(radio);
803         return 0;
804 }
805 
806 
807 /*
808  * si470x_usb_driver_resume - resume the device
809  */
810 static int si470x_usb_driver_resume(struct usb_interface *intf)
811 {
812         struct si470x_device *radio = usb_get_intfdata(intf);
813         int ret;
814 
815         dev_info(&intf->dev, "resuming now...\n");
816 
817         /* start radio */
818         ret = si470x_start_usb(radio);
819         if (ret == 0)
820                 v4l2_ctrl_handler_setup(&radio->hdl);
821 
822         return ret;
823 }
824 
825 
826 /*
827  * si470x_usb_driver_disconnect - disconnect the device
828  */
829 static void si470x_usb_driver_disconnect(struct usb_interface *intf)
830 {
831         struct si470x_device *radio = usb_get_intfdata(intf);
832 
833         mutex_lock(&radio->lock);
834         v4l2_device_disconnect(&radio->v4l2_dev);
835         video_unregister_device(&radio->videodev);
836         usb_set_intfdata(intf, NULL);
837         mutex_unlock(&radio->lock);
838         v4l2_device_put(&radio->v4l2_dev);
839 }
840 
841 
842 /*
843  * si470x_usb_driver - usb driver interface
844  *
845  * A note on suspend/resume: this driver had only empty suspend/resume
846  * functions, and when I tried to test suspend/resume it always disconnected
847  * instead of resuming (using my ADS InstantFM stick). So I've decided to
848  * remove these callbacks until someone else with better hardware can
849  * implement and test this.
850  */
851 static struct usb_driver si470x_usb_driver = {
852         .name                   = DRIVER_NAME,
853         .probe                  = si470x_usb_driver_probe,
854         .disconnect             = si470x_usb_driver_disconnect,
855         .suspend                = si470x_usb_driver_suspend,
856         .resume                 = si470x_usb_driver_resume,
857         .reset_resume           = si470x_usb_driver_resume,
858         .id_table               = si470x_usb_driver_id_table,
859 };
860 
861 module_usb_driver(si470x_usb_driver);
862 
863 MODULE_LICENSE("GPL");
864 MODULE_AUTHOR(DRIVER_AUTHOR);
865 MODULE_DESCRIPTION(DRIVER_DESC);
866 MODULE_VERSION(DRIVER_VERSION);
867 

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