1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Mirics MSi2500 driver
4  * Mirics MSi3101 SDR Dongle driver
5  *
6  * Copyright (C) 2013 Antti Palosaari <crope@iki.fi>
7  *
8  * That driver is somehow based of pwc driver:
9  *  (C) 1999-2004 Nemosoft Unv.
10  *  (C) 2004-2006 Luc Saillard (luc@saillard.org)
11  *  (C) 2011 Hans de Goede <hdegoede@redhat.com>
12  */
13 
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <asm/div64.h>
17 #include <media/v4l2-device.h>
18 #include <media/v4l2-ioctl.h>
19 #include <media/v4l2-ctrls.h>
20 #include <media/v4l2-event.h>
21 #include <linux/usb.h>
22 #include <media/videobuf2-v4l2.h>
23 #include <media/videobuf2-vmalloc.h>
24 #include <linux/spi/spi.h>
25 
26 static bool msi2500_emulated_fmt;
27 module_param_named(emulated_formats, msi2500_emulated_fmt, bool, 0644);
28 MODULE_PARM_DESC(emulated_formats, "enable emulated formats (disappears in future)");
29 
30 /*
31  *   iConfiguration          0
32  *     bInterfaceNumber        0
33  *     bAlternateSetting       1
34  *     bNumEndpoints           1
35  *       bEndpointAddress     0x81  EP 1 IN
36  *       bmAttributes            1
37  *         Transfer Type            Isochronous
38  *       wMaxPacketSize     0x1400  3x 1024 bytes
39  *       bInterval               1
40  */
41 #define MAX_ISO_BUFS            (8)
42 #define ISO_FRAMES_PER_DESC     (8)
43 #define ISO_MAX_FRAME_SIZE      (3 * 1024)
44 #define ISO_BUFFER_SIZE         (ISO_FRAMES_PER_DESC * ISO_MAX_FRAME_SIZE)
45 #define MAX_ISOC_ERRORS         20
46 
47 /*
48  * TODO: These formats should be moved to V4L2 API. Formats are currently
49  * disabled from formats[] table, not visible to userspace.
50  */
51  /* signed 12-bit */
52 #define MSI2500_PIX_FMT_SDR_S12         v4l2_fourcc('D', 'S', '1', '2')
53 /* Mirics MSi2500 format 384 */
54 #define MSI2500_PIX_FMT_SDR_MSI2500_384 v4l2_fourcc('M', '3', '8', '4')
55 
56 static const struct v4l2_frequency_band bands[] = {
57 	{
58 		.tuner = 0,
59 		.type = V4L2_TUNER_ADC,
60 		.index = 0,
61 		.capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
62 		.rangelow   =  1200000,
63 		.rangehigh  = 15000000,
64 	},
65 };
66 
67 /* stream formats */
68 struct msi2500_format {
69 	u32	pixelformat;
70 	u32	buffersize;
71 };
72 
73 /* format descriptions for capture and preview */
74 static struct msi2500_format formats[] = {
75 	{
76 		.pixelformat	= V4L2_SDR_FMT_CS8,
77 		.buffersize	= 3 * 1008,
78 #if 0
79 	}, {
80 		.pixelformat	= MSI2500_PIX_FMT_SDR_MSI2500_384,
81 	}, {
82 		.pixelformat	= MSI2500_PIX_FMT_SDR_S12,
83 #endif
84 	}, {
85 		.pixelformat	= V4L2_SDR_FMT_CS14LE,
86 		.buffersize	= 3 * 1008,
87 	}, {
88 		.pixelformat	= V4L2_SDR_FMT_CU8,
89 		.buffersize	= 3 * 1008,
90 	}, {
91 		.pixelformat	=  V4L2_SDR_FMT_CU16LE,
92 		.buffersize	= 3 * 1008,
93 	},
94 };
95 
96 static const unsigned int NUM_FORMATS = ARRAY_SIZE(formats);
97 
98 /* intermediate buffers with raw data from the USB device */
99 struct msi2500_frame_buf {
100 	/* common v4l buffer stuff -- must be first */
101 	struct vb2_v4l2_buffer vb;
102 	struct list_head list;
103 };
104 
105 struct msi2500_dev {
106 	struct device *dev;
107 	struct video_device vdev;
108 	struct v4l2_device v4l2_dev;
109 	struct v4l2_subdev *v4l2_subdev;
110 	struct spi_master *master;
111 
112 	/* videobuf2 queue and queued buffers list */
113 	struct vb2_queue vb_queue;
114 	struct list_head queued_bufs;
115 	spinlock_t queued_bufs_lock; /* Protects queued_bufs */
116 
117 	/* Note if taking both locks v4l2_lock must always be locked first! */
118 	struct mutex v4l2_lock;      /* Protects everything else */
119 	struct mutex vb_queue_lock;  /* Protects vb_queue and capt_file */
120 
121 	/* Pointer to our usb_device, will be NULL after unplug */
122 	struct usb_device *udev; /* Both mutexes most be hold when setting! */
123 
124 	unsigned int f_adc;
125 	u32 pixelformat;
126 	u32 buffersize;
127 	unsigned int num_formats;
128 
129 	unsigned int isoc_errors; /* number of contiguous ISOC errors */
130 	unsigned int vb_full; /* vb is full and packets dropped */
131 
132 	struct urb *urbs[MAX_ISO_BUFS];
133 
134 	/* Controls */
135 	struct v4l2_ctrl_handler hdl;
136 
137 	u32 next_sample; /* for track lost packets */
138 	u32 sample; /* for sample rate calc */
139 	unsigned long jiffies_next;
140 };
141 
142 /* Private functions */
143 static struct msi2500_frame_buf *msi2500_get_next_fill_buf(
144 							struct msi2500_dev *dev)
145 {
146 	unsigned long flags;
147 	struct msi2500_frame_buf *buf = NULL;
148 
149 	spin_lock_irqsave(&dev->queued_bufs_lock, flags);
150 	if (list_empty(&dev->queued_bufs))
151 		goto leave;
152 
153 	buf = list_entry(dev->queued_bufs.next, struct msi2500_frame_buf, list);
154 	list_del(&buf->list);
155 leave:
156 	spin_unlock_irqrestore(&dev->queued_bufs_lock, flags);
157 	return buf;
158 }
159 
160 /*
161  * +===========================================================================
162  * |   00-1023 | USB packet type '504'
163  * +===========================================================================
164  * |   00-  03 | sequence number of first sample in that USB packet
165  * +---------------------------------------------------------------------------
166  * |   04-  15 | garbage
167  * +---------------------------------------------------------------------------
168  * |   16-1023 | samples
169  * +---------------------------------------------------------------------------
170  * signed 8-bit sample
171  * 504 * 2 = 1008 samples
172  *
173  *
174  * +===========================================================================
175  * |   00-1023 | USB packet type '384'
176  * +===========================================================================
177  * |   00-  03 | sequence number of first sample in that USB packet
178  * +---------------------------------------------------------------------------
179  * |   04-  15 | garbage
180  * +---------------------------------------------------------------------------
181  * |   16- 175 | samples
182  * +---------------------------------------------------------------------------
183  * |  176- 179 | control bits for previous samples
184  * +---------------------------------------------------------------------------
185  * |  180- 339 | samples
186  * +---------------------------------------------------------------------------
187  * |  340- 343 | control bits for previous samples
188  * +---------------------------------------------------------------------------
189  * |  344- 503 | samples
190  * +---------------------------------------------------------------------------
191  * |  504- 507 | control bits for previous samples
192  * +---------------------------------------------------------------------------
193  * |  508- 667 | samples
194  * +---------------------------------------------------------------------------
195  * |  668- 671 | control bits for previous samples
196  * +---------------------------------------------------------------------------
197  * |  672- 831 | samples
198  * +---------------------------------------------------------------------------
199  * |  832- 835 | control bits for previous samples
200  * +---------------------------------------------------------------------------
201  * |  836- 995 | samples
202  * +---------------------------------------------------------------------------
203  * |  996- 999 | control bits for previous samples
204  * +---------------------------------------------------------------------------
205  * | 1000-1023 | garbage
206  * +---------------------------------------------------------------------------
207  *
208  * Bytes 4 - 7 could have some meaning?
209  *
210  * Control bits for previous samples is 32-bit field, containing 16 x 2-bit
211  * numbers. This results one 2-bit number for 8 samples. It is likely used for
212  * for bit shifting sample by given bits, increasing actual sampling resolution.
213  * Number 2 (0b10) was never seen.
214  *
215  * 6 * 16 * 2 * 4 = 768 samples. 768 * 4 = 3072 bytes
216  *
217  *
218  * +===========================================================================
219  * |   00-1023 | USB packet type '336'
220  * +===========================================================================
221  * |   00-  03 | sequence number of first sample in that USB packet
222  * +---------------------------------------------------------------------------
223  * |   04-  15 | garbage
224  * +---------------------------------------------------------------------------
225  * |   16-1023 | samples
226  * +---------------------------------------------------------------------------
227  * signed 12-bit sample
228  *
229  *
230  * +===========================================================================
231  * |   00-1023 | USB packet type '252'
232  * +===========================================================================
233  * |   00-  03 | sequence number of first sample in that USB packet
234  * +---------------------------------------------------------------------------
235  * |   04-  15 | garbage
236  * +---------------------------------------------------------------------------
237  * |   16-1023 | samples
238  * +---------------------------------------------------------------------------
239  * signed 14-bit sample
240  */
241 
242 static int msi2500_convert_stream(struct msi2500_dev *dev, u8 *dst, u8 *src,
243 				  unsigned int src_len)
244 {
245 	unsigned int i, j, transactions, dst_len = 0;
246 	u32 sample[3];
247 
248 	/* There could be 1-3 1024 byte transactions per packet */
249 	transactions = src_len / 1024;
250 
251 	for (i = 0; i < transactions; i++) {
252 		sample[i] = src[3] << 24 | src[2] << 16 | src[1] << 8 |
253 				src[0] << 0;
254 		if (i == 0 && dev->next_sample != sample[0]) {
255 			dev_dbg_ratelimited(dev->dev,
256 					    "%d samples lost, %d %08x:%08x\n",
257 					    sample[0] - dev->next_sample,
258 					    src_len, dev->next_sample,
259 					    sample[0]);
260 		}
261 
262 		/*
263 		 * Dump all unknown 'garbage' data - maybe we will discover
264 		 * someday if there is something rational...
265 		 */
266 		dev_dbg_ratelimited(dev->dev, "%*ph\n", 12, &src[4]);
267 
268 		src += 16; /* skip header */
269 
270 		switch (dev->pixelformat) {
271 		case V4L2_SDR_FMT_CU8: /* 504 x IQ samples */
272 		{
273 			s8 *s8src = (s8 *)src;
274 			u8 *u8dst = (u8 *)dst;
275 
276 			for (j = 0; j < 1008; j++)
277 				*u8dst++ = *s8src++ + 128;
278 
279 			src += 1008;
280 			dst += 1008;
281 			dst_len += 1008;
282 			dev->next_sample = sample[i] + 504;
283 			break;
284 		}
285 		case  V4L2_SDR_FMT_CU16LE: /* 252 x IQ samples */
286 		{
287 			s16 *s16src = (s16 *)src;
288 			u16 *u16dst = (u16 *)dst;
289 			struct {signed int x:14; } se; /* sign extension */
290 			unsigned int utmp;
291 
292 			for (j = 0; j < 1008; j += 2) {
293 				/* sign extension from 14-bit to signed int */
294 				se.x = *s16src++;
295 				/* from signed int to unsigned int */
296 				utmp = se.x + 8192;
297 				/* from 14-bit to 16-bit */
298 				*u16dst++ = utmp << 2 | utmp >> 12;
299 			}
300 
301 			src += 1008;
302 			dst += 1008;
303 			dst_len += 1008;
304 			dev->next_sample = sample[i] + 252;
305 			break;
306 		}
307 		case MSI2500_PIX_FMT_SDR_MSI2500_384: /* 384 x IQ samples */
308 			/* Dump unknown 'garbage' data */
309 			dev_dbg_ratelimited(dev->dev, "%*ph\n", 24, &src[1000]);
310 			memcpy(dst, src, 984);
311 			src += 984 + 24;
312 			dst += 984;
313 			dst_len += 984;
314 			dev->next_sample = sample[i] + 384;
315 			break;
316 		case V4L2_SDR_FMT_CS8:         /* 504 x IQ samples */
317 			memcpy(dst, src, 1008);
318 			src += 1008;
319 			dst += 1008;
320 			dst_len += 1008;
321 			dev->next_sample = sample[i] + 504;
322 			break;
323 		case MSI2500_PIX_FMT_SDR_S12:  /* 336 x IQ samples */
324 			memcpy(dst, src, 1008);
325 			src += 1008;
326 			dst += 1008;
327 			dst_len += 1008;
328 			dev->next_sample = sample[i] + 336;
329 			break;
330 		case V4L2_SDR_FMT_CS14LE:      /* 252 x IQ samples */
331 			memcpy(dst, src, 1008);
332 			src += 1008;
333 			dst += 1008;
334 			dst_len += 1008;
335 			dev->next_sample = sample[i] + 252;
336 			break;
337 		default:
338 			break;
339 		}
340 	}
341 
342 	/* calculate sample rate and output it in 10 seconds intervals */
343 	if (unlikely(time_is_before_jiffies(dev->jiffies_next))) {
344 		#define MSECS 10000UL
345 		unsigned int msecs = jiffies_to_msecs(jiffies -
346 				dev->jiffies_next + msecs_to_jiffies(MSECS));
347 		unsigned int samples = dev->next_sample - dev->sample;
348 
349 		dev->jiffies_next = jiffies + msecs_to_jiffies(MSECS);
350 		dev->sample = dev->next_sample;
351 		dev_dbg(dev->dev, "size=%u samples=%u msecs=%u sample rate=%lu\n",
352 			src_len, samples, msecs,
353 			samples * 1000UL / msecs);
354 	}
355 
356 	return dst_len;
357 }
358 
359 /*
360  * This gets called for the Isochronous pipe (stream). This is done in interrupt
361  * time, so it has to be fast, not crash, and not stall. Neat.
362  */
363 static void msi2500_isoc_handler(struct urb *urb)
364 {
365 	struct msi2500_dev *dev = (struct msi2500_dev *)urb->context;
366 	int i, flen, fstatus;
367 	unsigned char *iso_buf = NULL;
368 	struct msi2500_frame_buf *fbuf;
369 
370 	if (unlikely(urb->status == -ENOENT ||
371 		     urb->status == -ECONNRESET ||
372 		     urb->status == -ESHUTDOWN)) {
373 		dev_dbg(dev->dev, "URB (%p) unlinked %ssynchronously\n",
374 			urb, urb->status == -ENOENT ? "" : "a");
375 		return;
376 	}
377 
378 	if (unlikely(urb->status != 0)) {
379 		dev_dbg(dev->dev, "called with status %d\n", urb->status);
380 		/* Give up after a number of contiguous errors */
381 		if (++dev->isoc_errors > MAX_ISOC_ERRORS)
382 			dev_dbg(dev->dev, "Too many ISOC errors, bailing out\n");
383 		goto handler_end;
384 	} else {
385 		/* Reset ISOC error counter. We did get here, after all. */
386 		dev->isoc_errors = 0;
387 	}
388 
389 	/* Compact data */
390 	for (i = 0; i < urb->number_of_packets; i++) {
391 		void *ptr;
392 
393 		/* Check frame error */
394 		fstatus = urb->iso_frame_desc[i].status;
395 		if (unlikely(fstatus)) {
396 			dev_dbg_ratelimited(dev->dev,
397 					    "frame=%d/%d has error %d skipping\n",
398 					    i, urb->number_of_packets, fstatus);
399 			continue;
400 		}
401 
402 		/* Check if that frame contains data */
403 		flen = urb->iso_frame_desc[i].actual_length;
404 		if (unlikely(flen == 0))
405 			continue;
406 
407 		iso_buf = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
408 
409 		/* Get free framebuffer */
410 		fbuf = msi2500_get_next_fill_buf(dev);
411 		if (unlikely(fbuf == NULL)) {
412 			dev->vb_full++;
413 			dev_dbg_ratelimited(dev->dev,
414 					    "videobuf is full, %d packets dropped\n",
415 					    dev->vb_full);
416 			continue;
417 		}
418 
419 		/* fill framebuffer */
420 		ptr = vb2_plane_vaddr(&fbuf->vb.vb2_buf, 0);
421 		flen = msi2500_convert_stream(dev, ptr, iso_buf, flen);
422 		vb2_set_plane_payload(&fbuf->vb.vb2_buf, 0, flen);
423 		vb2_buffer_done(&fbuf->vb.vb2_buf, VB2_BUF_STATE_DONE);
424 	}
425 
426 handler_end:
427 	i = usb_submit_urb(urb, GFP_ATOMIC);
428 	if (unlikely(i != 0))
429 		dev_dbg(dev->dev, "Error (%d) re-submitting urb\n", i);
430 }
431 
432 static void msi2500_iso_stop(struct msi2500_dev *dev)
433 {
434 	int i;
435 
436 	dev_dbg(dev->dev, "\n");
437 
438 	/* Unlinking ISOC buffers one by one */
439 	for (i = 0; i < MAX_ISO_BUFS; i++) {
440 		if (dev->urbs[i]) {
441 			dev_dbg(dev->dev, "Unlinking URB %p\n", dev->urbs[i]);
442 			usb_kill_urb(dev->urbs[i]);
443 		}
444 	}
445 }
446 
447 static void msi2500_iso_free(struct msi2500_dev *dev)
448 {
449 	int i;
450 
451 	dev_dbg(dev->dev, "\n");
452 
453 	/* Freeing ISOC buffers one by one */
454 	for (i = 0; i < MAX_ISO_BUFS; i++) {
455 		if (dev->urbs[i]) {
456 			dev_dbg(dev->dev, "Freeing URB\n");
457 			if (dev->urbs[i]->transfer_buffer) {
458 				usb_free_coherent(dev->udev,
459 					dev->urbs[i]->transfer_buffer_length,
460 					dev->urbs[i]->transfer_buffer,
461 					dev->urbs[i]->transfer_dma);
462 			}
463 			usb_free_urb(dev->urbs[i]);
464 			dev->urbs[i] = NULL;
465 		}
466 	}
467 }
468 
469 /* Both v4l2_lock and vb_queue_lock should be locked when calling this */
470 static void msi2500_isoc_cleanup(struct msi2500_dev *dev)
471 {
472 	dev_dbg(dev->dev, "\n");
473 
474 	msi2500_iso_stop(dev);
475 	msi2500_iso_free(dev);
476 }
477 
478 /* Both v4l2_lock and vb_queue_lock should be locked when calling this */
479 static int msi2500_isoc_init(struct msi2500_dev *dev)
480 {
481 	struct urb *urb;
482 	int i, j, ret;
483 
484 	dev_dbg(dev->dev, "\n");
485 
486 	dev->isoc_errors = 0;
487 
488 	ret = usb_set_interface(dev->udev, 0, 1);
489 	if (ret)
490 		return ret;
491 
492 	/* Allocate and init Isochronuous urbs */
493 	for (i = 0; i < MAX_ISO_BUFS; i++) {
494 		urb = usb_alloc_urb(ISO_FRAMES_PER_DESC, GFP_KERNEL);
495 		if (urb == NULL) {
496 			msi2500_isoc_cleanup(dev);
497 			return -ENOMEM;
498 		}
499 		dev->urbs[i] = urb;
500 		dev_dbg(dev->dev, "Allocated URB at 0x%p\n", urb);
501 
502 		urb->interval = 1;
503 		urb->dev = dev->udev;
504 		urb->pipe = usb_rcvisocpipe(dev->udev, 0x81);
505 		urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
506 		urb->transfer_buffer = usb_alloc_coherent(dev->udev,
507 				ISO_BUFFER_SIZE,
508 				GFP_KERNEL, &urb->transfer_dma);
509 		if (urb->transfer_buffer == NULL) {
510 			dev_err(dev->dev,
511 				"Failed to allocate urb buffer %d\n", i);
512 			msi2500_isoc_cleanup(dev);
513 			return -ENOMEM;
514 		}
515 		urb->transfer_buffer_length = ISO_BUFFER_SIZE;
516 		urb->complete = msi2500_isoc_handler;
517 		urb->context = dev;
518 		urb->start_frame = 0;
519 		urb->number_of_packets = ISO_FRAMES_PER_DESC;
520 		for (j = 0; j < ISO_FRAMES_PER_DESC; j++) {
521 			urb->iso_frame_desc[j].offset = j * ISO_MAX_FRAME_SIZE;
522 			urb->iso_frame_desc[j].length = ISO_MAX_FRAME_SIZE;
523 		}
524 	}
525 
526 	/* link */
527 	for (i = 0; i < MAX_ISO_BUFS; i++) {
528 		ret = usb_submit_urb(dev->urbs[i], GFP_KERNEL);
529 		if (ret) {
530 			dev_err(dev->dev,
531 				"usb_submit_urb %d failed with error %d\n",
532 				i, ret);
533 			msi2500_isoc_cleanup(dev);
534 			return ret;
535 		}
536 		dev_dbg(dev->dev, "URB 0x%p submitted.\n", dev->urbs[i]);
537 	}
538 
539 	/* All is done... */
540 	return 0;
541 }
542 
543 /* Must be called with vb_queue_lock hold */
544 static void msi2500_cleanup_queued_bufs(struct msi2500_dev *dev)
545 {
546 	unsigned long flags;
547 
548 	dev_dbg(dev->dev, "\n");
549 
550 	spin_lock_irqsave(&dev->queued_bufs_lock, flags);
551 	while (!list_empty(&dev->queued_bufs)) {
552 		struct msi2500_frame_buf *buf;
553 
554 		buf = list_entry(dev->queued_bufs.next,
555 				 struct msi2500_frame_buf, list);
556 		list_del(&buf->list);
557 		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
558 	}
559 	spin_unlock_irqrestore(&dev->queued_bufs_lock, flags);
560 }
561 
562 /* The user yanked out the cable... */
563 static void msi2500_disconnect(struct usb_interface *intf)
564 {
565 	struct v4l2_device *v = usb_get_intfdata(intf);
566 	struct msi2500_dev *dev =
567 			container_of(v, struct msi2500_dev, v4l2_dev);
568 
569 	dev_dbg(dev->dev, "\n");
570 
571 	mutex_lock(&dev->vb_queue_lock);
572 	mutex_lock(&dev->v4l2_lock);
573 	/* No need to keep the urbs around after disconnection */
574 	dev->udev = NULL;
575 	v4l2_device_disconnect(&dev->v4l2_dev);
576 	video_unregister_device(&dev->vdev);
577 	spi_unregister_master(dev->master);
578 	mutex_unlock(&dev->v4l2_lock);
579 	mutex_unlock(&dev->vb_queue_lock);
580 
581 	v4l2_device_put(&dev->v4l2_dev);
582 }
583 
584 static int msi2500_querycap(struct file *file, void *fh,
585 			    struct v4l2_capability *cap)
586 {
587 	struct msi2500_dev *dev = video_drvdata(file);
588 
589 	dev_dbg(dev->dev, "\n");
590 
591 	strscpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
592 	strscpy(cap->card, dev->vdev.name, sizeof(cap->card));
593 	usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
594 	return 0;
595 }
596 
597 /* Videobuf2 operations */
598 static int msi2500_queue_setup(struct vb2_queue *vq,
599 			       unsigned int *nbuffers,
600 			       unsigned int *nplanes, unsigned int sizes[],
601 			       struct device *alloc_devs[])
602 {
603 	struct msi2500_dev *dev = vb2_get_drv_priv(vq);
604 
605 	dev_dbg(dev->dev, "nbuffers=%d\n", *nbuffers);
606 
607 	/* Absolute min and max number of buffers available for mmap() */
608 	*nbuffers = clamp_t(unsigned int, *nbuffers, 8, 32);
609 	*nplanes = 1;
610 	sizes[0] = PAGE_ALIGN(dev->buffersize);
611 	dev_dbg(dev->dev, "nbuffers=%d sizes[0]=%d\n", *nbuffers, sizes[0]);
612 	return 0;
613 }
614 
615 static void msi2500_buf_queue(struct vb2_buffer *vb)
616 {
617 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
618 	struct msi2500_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
619 	struct msi2500_frame_buf *buf = container_of(vbuf,
620 						     struct msi2500_frame_buf,
621 						     vb);
622 	unsigned long flags;
623 
624 	/* Check the device has not disconnected between prep and queuing */
625 	if (unlikely(!dev->udev)) {
626 		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
627 		return;
628 	}
629 
630 	spin_lock_irqsave(&dev->queued_bufs_lock, flags);
631 	list_add_tail(&buf->list, &dev->queued_bufs);
632 	spin_unlock_irqrestore(&dev->queued_bufs_lock, flags);
633 }
634 
635 #define CMD_WREG               0x41
636 #define CMD_START_STREAMING    0x43
637 #define CMD_STOP_STREAMING     0x45
638 #define CMD_READ_UNKNOWN       0x48
639 
640 #define msi2500_dbg_usb_control_msg(_dev, _r, _t, _v, _i, _b, _l) { \
641 	char *_direction; \
642 	if (_t & USB_DIR_IN) \
643 		_direction = "<<<"; \
644 	else \
645 		_direction = ">>>"; \
646 	dev_dbg(_dev, "%02x %02x %02x %02x %02x %02x %02x %02x %s %*ph\n", \
647 			_t, _r, _v & 0xff, _v >> 8, _i & 0xff, _i >> 8, \
648 			_l & 0xff, _l >> 8, _direction, _l, _b); \
649 }
650 
651 static int msi2500_ctrl_msg(struct msi2500_dev *dev, u8 cmd, u32 data)
652 {
653 	int ret;
654 	u8 request = cmd;
655 	u8 requesttype = USB_DIR_OUT | USB_TYPE_VENDOR;
656 	u16 value = (data >> 0) & 0xffff;
657 	u16 index = (data >> 16) & 0xffff;
658 
659 	msi2500_dbg_usb_control_msg(dev->dev, request, requesttype,
660 				    value, index, NULL, 0);
661 	ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), request,
662 			      requesttype, value, index, NULL, 0, 2000);
663 	if (ret)
664 		dev_err(dev->dev, "failed %d, cmd %02x, data %04x\n",
665 			ret, cmd, data);
666 
667 	return ret;
668 }
669 
670 static int msi2500_set_usb_adc(struct msi2500_dev *dev)
671 {
672 	int ret;
673 	unsigned int f_vco, f_sr, div_n, k, k_cw, div_out;
674 	u32 reg3, reg4, reg7;
675 	struct v4l2_ctrl *bandwidth_auto;
676 	struct v4l2_ctrl *bandwidth;
677 
678 	f_sr = dev->f_adc;
679 
680 	/* set tuner, subdev, filters according to sampling rate */
681 	bandwidth_auto = v4l2_ctrl_find(&dev->hdl,
682 			V4L2_CID_RF_TUNER_BANDWIDTH_AUTO);
683 	if (v4l2_ctrl_g_ctrl(bandwidth_auto)) {
684 		bandwidth = v4l2_ctrl_find(&dev->hdl,
685 				V4L2_CID_RF_TUNER_BANDWIDTH);
686 		v4l2_ctrl_s_ctrl(bandwidth, dev->f_adc);
687 	}
688 
689 	/* select stream format */
690 	switch (dev->pixelformat) {
691 	case V4L2_SDR_FMT_CU8:
692 		reg7 = 0x000c9407; /* 504 */
693 		break;
694 	case  V4L2_SDR_FMT_CU16LE:
695 		reg7 = 0x00009407; /* 252 */
696 		break;
697 	case V4L2_SDR_FMT_CS8:
698 		reg7 = 0x000c9407; /* 504 */
699 		break;
700 	case MSI2500_PIX_FMT_SDR_MSI2500_384:
701 		reg7 = 0x0000a507; /* 384 */
702 		break;
703 	case MSI2500_PIX_FMT_SDR_S12:
704 		reg7 = 0x00008507; /* 336 */
705 		break;
706 	case V4L2_SDR_FMT_CS14LE:
707 		reg7 = 0x00009407; /* 252 */
708 		break;
709 	default:
710 		reg7 = 0x000c9407; /* 504 */
711 		break;
712 	}
713 
714 	/*
715 	 * Fractional-N synthesizer
716 	 *
717 	 *           +----------------------------------------+
718 	 *           v                                        |
719 	 *  Fref   +----+     +-------+     +-----+         +------+     +---+
720 	 * ------> | PD | --> |  VCO  | --> | /2  | ------> | /N.F | <-- | K |
721 	 *         +----+     +-------+     +-----+         +------+     +---+
722 	 *                      |
723 	 *                      |
724 	 *                      v
725 	 *                    +-------+     +-----+  Fout
726 	 *                    | /Rout | --> | /12 | ------>
727 	 *                    +-------+     +-----+
728 	 */
729 	/*
730 	 * Synthesizer config is just a educated guess...
731 	 *
732 	 * [7:0]   0x03, register address
733 	 * [8]     1, power control
734 	 * [9]     ?, power control
735 	 * [12:10] output divider
736 	 * [13]    0 ?
737 	 * [14]    0 ?
738 	 * [15]    fractional MSB, bit 20
739 	 * [16:19] N
740 	 * [23:20] ?
741 	 * [24:31] 0x01
742 	 *
743 	 * output divider
744 	 * val   div
745 	 *   0     - (invalid)
746 	 *   1     4
747 	 *   2     6
748 	 *   3     8
749 	 *   4    10
750 	 *   5    12
751 	 *   6    14
752 	 *   7    16
753 	 *
754 	 * VCO 202000000 - 720000000++
755 	 */
756 
757 	#define F_REF 24000000
758 	#define DIV_PRE_N 2
759 	#define DIV_LO_OUT 12
760 	reg3 = 0x01000303;
761 	reg4 = 0x00000004;
762 
763 	/* XXX: Filters? AGC? VCO band? */
764 	if (f_sr < 6000000)
765 		reg3 |= 0x1 << 20;
766 	else if (f_sr < 7000000)
767 		reg3 |= 0x5 << 20;
768 	else if (f_sr < 8500000)
769 		reg3 |= 0x9 << 20;
770 	else
771 		reg3 |= 0xd << 20;
772 
773 	for (div_out = 4; div_out < 16; div_out += 2) {
774 		f_vco = f_sr * div_out * DIV_LO_OUT;
775 		dev_dbg(dev->dev, "div_out=%u f_vco=%u\n", div_out, f_vco);
776 		if (f_vco >= 202000000)
777 			break;
778 	}
779 
780 	/* Calculate PLL integer and fractional control word. */
781 	div_n = div_u64_rem(f_vco, DIV_PRE_N * F_REF, &k);
782 	k_cw = div_u64((u64) k * 0x200000, DIV_PRE_N * F_REF);
783 
784 	reg3 |= div_n << 16;
785 	reg3 |= (div_out / 2 - 1) << 10;
786 	reg3 |= ((k_cw >> 20) & 0x000001) << 15; /* [20] */
787 	reg4 |= ((k_cw >>  0) & 0x0fffff) <<  8; /* [19:0] */
788 
789 	dev_dbg(dev->dev,
790 		"f_sr=%u f_vco=%u div_n=%u k=%u div_out=%u reg3=%08x reg4=%08x\n",
791 		f_sr, f_vco, div_n, k, div_out, reg3, reg4);
792 
793 	ret = msi2500_ctrl_msg(dev, CMD_WREG, 0x00608008);
794 	if (ret)
795 		goto err;
796 
797 	ret = msi2500_ctrl_msg(dev, CMD_WREG, 0x00000c05);
798 	if (ret)
799 		goto err;
800 
801 	ret = msi2500_ctrl_msg(dev, CMD_WREG, 0x00020000);
802 	if (ret)
803 		goto err;
804 
805 	ret = msi2500_ctrl_msg(dev, CMD_WREG, 0x00480102);
806 	if (ret)
807 		goto err;
808 
809 	ret = msi2500_ctrl_msg(dev, CMD_WREG, 0x00f38008);
810 	if (ret)
811 		goto err;
812 
813 	ret = msi2500_ctrl_msg(dev, CMD_WREG, reg7);
814 	if (ret)
815 		goto err;
816 
817 	ret = msi2500_ctrl_msg(dev, CMD_WREG, reg4);
818 	if (ret)
819 		goto err;
820 
821 	ret = msi2500_ctrl_msg(dev, CMD_WREG, reg3);
822 err:
823 	return ret;
824 }
825 
826 static int msi2500_start_streaming(struct vb2_queue *vq, unsigned int count)
827 {
828 	struct msi2500_dev *dev = vb2_get_drv_priv(vq);
829 	int ret;
830 
831 	dev_dbg(dev->dev, "\n");
832 
833 	if (!dev->udev)
834 		return -ENODEV;
835 
836 	if (mutex_lock_interruptible(&dev->v4l2_lock))
837 		return -ERESTARTSYS;
838 
839 	/* wake-up tuner */
840 	v4l2_subdev_call(dev->v4l2_subdev, core, s_power, 1);
841 
842 	ret = msi2500_set_usb_adc(dev);
843 
844 	ret = msi2500_isoc_init(dev);
845 	if (ret)
846 		msi2500_cleanup_queued_bufs(dev);
847 
848 	ret = msi2500_ctrl_msg(dev, CMD_START_STREAMING, 0);
849 
850 	mutex_unlock(&dev->v4l2_lock);
851 
852 	return ret;
853 }
854 
855 static void msi2500_stop_streaming(struct vb2_queue *vq)
856 {
857 	struct msi2500_dev *dev = vb2_get_drv_priv(vq);
858 
859 	dev_dbg(dev->dev, "\n");
860 
861 	mutex_lock(&dev->v4l2_lock);
862 
863 	if (dev->udev)
864 		msi2500_isoc_cleanup(dev);
865 
866 	msi2500_cleanup_queued_bufs(dev);
867 
868 	/* according to tests, at least 700us delay is required  */
869 	msleep(20);
870 	if (dev->udev && !msi2500_ctrl_msg(dev, CMD_STOP_STREAMING, 0)) {
871 		/* sleep USB IF / ADC */
872 		msi2500_ctrl_msg(dev, CMD_WREG, 0x01000003);
873 	}
874 
875 	/* sleep tuner */
876 	v4l2_subdev_call(dev->v4l2_subdev, core, s_power, 0);
877 
878 	mutex_unlock(&dev->v4l2_lock);
879 }
880 
881 static const struct vb2_ops msi2500_vb2_ops = {
882 	.queue_setup            = msi2500_queue_setup,
883 	.buf_queue              = msi2500_buf_queue,
884 	.start_streaming        = msi2500_start_streaming,
885 	.stop_streaming         = msi2500_stop_streaming,
886 	.wait_prepare           = vb2_ops_wait_prepare,
887 	.wait_finish            = vb2_ops_wait_finish,
888 };
889 
890 static int msi2500_enum_fmt_sdr_cap(struct file *file, void *priv,
891 				    struct v4l2_fmtdesc *f)
892 {
893 	struct msi2500_dev *dev = video_drvdata(file);
894 
895 	dev_dbg(dev->dev, "index=%d\n", f->index);
896 
897 	if (f->index >= dev->num_formats)
898 		return -EINVAL;
899 
900 	f->pixelformat = formats[f->index].pixelformat;
901 
902 	return 0;
903 }
904 
905 static int msi2500_g_fmt_sdr_cap(struct file *file, void *priv,
906 				 struct v4l2_format *f)
907 {
908 	struct msi2500_dev *dev = video_drvdata(file);
909 
910 	dev_dbg(dev->dev, "pixelformat fourcc %4.4s\n",
911 		(char *)&dev->pixelformat);
912 
913 	f->fmt.sdr.pixelformat = dev->pixelformat;
914 	f->fmt.sdr.buffersize = dev->buffersize;
915 	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
916 
917 	return 0;
918 }
919 
920 static int msi2500_s_fmt_sdr_cap(struct file *file, void *priv,
921 				 struct v4l2_format *f)
922 {
923 	struct msi2500_dev *dev = video_drvdata(file);
924 	struct vb2_queue *q = &dev->vb_queue;
925 	int i;
926 
927 	dev_dbg(dev->dev, "pixelformat fourcc %4.4s\n",
928 		(char *)&f->fmt.sdr.pixelformat);
929 
930 	if (vb2_is_busy(q))
931 		return -EBUSY;
932 
933 	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
934 	for (i = 0; i < dev->num_formats; i++) {
935 		if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
936 			dev->pixelformat = formats[i].pixelformat;
937 			dev->buffersize = formats[i].buffersize;
938 			f->fmt.sdr.buffersize = formats[i].buffersize;
939 			return 0;
940 		}
941 	}
942 
943 	dev->pixelformat = formats[0].pixelformat;
944 	dev->buffersize = formats[0].buffersize;
945 	f->fmt.sdr.pixelformat = formats[0].pixelformat;
946 	f->fmt.sdr.buffersize = formats[0].buffersize;
947 
948 	return 0;
949 }
950 
951 static int msi2500_try_fmt_sdr_cap(struct file *file, void *priv,
952 				   struct v4l2_format *f)
953 {
954 	struct msi2500_dev *dev = video_drvdata(file);
955 	int i;
956 
957 	dev_dbg(dev->dev, "pixelformat fourcc %4.4s\n",
958 		(char *)&f->fmt.sdr.pixelformat);
959 
960 	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
961 	for (i = 0; i < dev->num_formats; i++) {
962 		if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
963 			f->fmt.sdr.buffersize = formats[i].buffersize;
964 			return 0;
965 		}
966 	}
967 
968 	f->fmt.sdr.pixelformat = formats[0].pixelformat;
969 	f->fmt.sdr.buffersize = formats[0].buffersize;
970 
971 	return 0;
972 }
973 
974 static int msi2500_s_tuner(struct file *file, void *priv,
975 			   const struct v4l2_tuner *v)
976 {
977 	struct msi2500_dev *dev = video_drvdata(file);
978 	int ret;
979 
980 	dev_dbg(dev->dev, "index=%d\n", v->index);
981 
982 	if (v->index == 0)
983 		ret = 0;
984 	else if (v->index == 1)
985 		ret = v4l2_subdev_call(dev->v4l2_subdev, tuner, s_tuner, v);
986 	else
987 		ret = -EINVAL;
988 
989 	return ret;
990 }
991 
992 static int msi2500_g_tuner(struct file *file, void *priv, struct v4l2_tuner *v)
993 {
994 	struct msi2500_dev *dev = video_drvdata(file);
995 	int ret;
996 
997 	dev_dbg(dev->dev, "index=%d\n", v->index);
998 
999 	if (v->index == 0) {
1000 		strscpy(v->name, "Mirics MSi2500", sizeof(v->name));
1001 		v->type = V4L2_TUNER_ADC;
1002 		v->capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS;
1003 		v->rangelow =   1200000;
1004 		v->rangehigh = 15000000;
1005 		ret = 0;
1006 	} else if (v->index == 1) {
1007 		ret = v4l2_subdev_call(dev->v4l2_subdev, tuner, g_tuner, v);
1008 	} else {
1009 		ret = -EINVAL;
1010 	}
1011 
1012 	return ret;
1013 }
1014 
1015 static int msi2500_g_frequency(struct file *file, void *priv,
1016 			       struct v4l2_frequency *f)
1017 {
1018 	struct msi2500_dev *dev = video_drvdata(file);
1019 	int ret  = 0;
1020 
1021 	dev_dbg(dev->dev, "tuner=%d type=%d\n", f->tuner, f->type);
1022 
1023 	if (f->tuner == 0) {
1024 		f->frequency = dev->f_adc;
1025 		ret = 0;
1026 	} else if (f->tuner == 1) {
1027 		f->type = V4L2_TUNER_RF;
1028 		ret = v4l2_subdev_call(dev->v4l2_subdev, tuner, g_frequency, f);
1029 	} else {
1030 		ret = -EINVAL;
1031 	}
1032 
1033 	return ret;
1034 }
1035 
1036 static int msi2500_s_frequency(struct file *file, void *priv,
1037 			       const struct v4l2_frequency *f)
1038 {
1039 	struct msi2500_dev *dev = video_drvdata(file);
1040 	int ret;
1041 
1042 	dev_dbg(dev->dev, "tuner=%d type=%d frequency=%u\n",
1043 		f->tuner, f->type, f->frequency);
1044 
1045 	if (f->tuner == 0) {
1046 		dev->f_adc = clamp_t(unsigned int, f->frequency,
1047 				     bands[0].rangelow,
1048 				     bands[0].rangehigh);
1049 		dev_dbg(dev->dev, "ADC frequency=%u Hz\n", dev->f_adc);
1050 		ret = msi2500_set_usb_adc(dev);
1051 	} else if (f->tuner == 1) {
1052 		ret = v4l2_subdev_call(dev->v4l2_subdev, tuner, s_frequency, f);
1053 	} else {
1054 		ret = -EINVAL;
1055 	}
1056 
1057 	return ret;
1058 }
1059 
1060 static int msi2500_enum_freq_bands(struct file *file, void *priv,
1061 				   struct v4l2_frequency_band *band)
1062 {
1063 	struct msi2500_dev *dev = video_drvdata(file);
1064 	int ret;
1065 
1066 	dev_dbg(dev->dev, "tuner=%d type=%d index=%d\n",
1067 		band->tuner, band->type, band->index);
1068 
1069 	if (band->tuner == 0) {
1070 		if (band->index >= ARRAY_SIZE(bands)) {
1071 			ret = -EINVAL;
1072 		} else {
1073 			*band = bands[band->index];
1074 			ret = 0;
1075 		}
1076 	} else if (band->tuner == 1) {
1077 		ret = v4l2_subdev_call(dev->v4l2_subdev, tuner,
1078 				       enum_freq_bands, band);
1079 	} else {
1080 		ret = -EINVAL;
1081 	}
1082 
1083 	return ret;
1084 }
1085 
1086 static const struct v4l2_ioctl_ops msi2500_ioctl_ops = {
1087 	.vidioc_querycap          = msi2500_querycap,
1088 
1089 	.vidioc_enum_fmt_sdr_cap  = msi2500_enum_fmt_sdr_cap,
1090 	.vidioc_g_fmt_sdr_cap     = msi2500_g_fmt_sdr_cap,
1091 	.vidioc_s_fmt_sdr_cap     = msi2500_s_fmt_sdr_cap,
1092 	.vidioc_try_fmt_sdr_cap   = msi2500_try_fmt_sdr_cap,
1093 
1094 	.vidioc_reqbufs           = vb2_ioctl_reqbufs,
1095 	.vidioc_create_bufs       = vb2_ioctl_create_bufs,
1096 	.vidioc_prepare_buf       = vb2_ioctl_prepare_buf,
1097 	.vidioc_querybuf          = vb2_ioctl_querybuf,
1098 	.vidioc_qbuf              = vb2_ioctl_qbuf,
1099 	.vidioc_dqbuf             = vb2_ioctl_dqbuf,
1100 
1101 	.vidioc_streamon          = vb2_ioctl_streamon,
1102 	.vidioc_streamoff         = vb2_ioctl_streamoff,
1103 
1104 	.vidioc_g_tuner           = msi2500_g_tuner,
1105 	.vidioc_s_tuner           = msi2500_s_tuner,
1106 
1107 	.vidioc_g_frequency       = msi2500_g_frequency,
1108 	.vidioc_s_frequency       = msi2500_s_frequency,
1109 	.vidioc_enum_freq_bands   = msi2500_enum_freq_bands,
1110 
1111 	.vidioc_subscribe_event   = v4l2_ctrl_subscribe_event,
1112 	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1113 	.vidioc_log_status        = v4l2_ctrl_log_status,
1114 };
1115 
1116 static const struct v4l2_file_operations msi2500_fops = {
1117 	.owner                    = THIS_MODULE,
1118 	.open                     = v4l2_fh_open,
1119 	.release                  = vb2_fop_release,
1120 	.read                     = vb2_fop_read,
1121 	.poll                     = vb2_fop_poll,
1122 	.mmap                     = vb2_fop_mmap,
1123 	.unlocked_ioctl           = video_ioctl2,
1124 };
1125 
1126 static const struct video_device msi2500_template = {
1127 	.name                     = "Mirics MSi3101 SDR Dongle",
1128 	.release                  = video_device_release_empty,
1129 	.fops                     = &msi2500_fops,
1130 	.ioctl_ops                = &msi2500_ioctl_ops,
1131 };
1132 
1133 static void msi2500_video_release(struct v4l2_device *v)
1134 {
1135 	struct msi2500_dev *dev = container_of(v, struct msi2500_dev, v4l2_dev);
1136 
1137 	v4l2_ctrl_handler_free(&dev->hdl);
1138 	v4l2_device_unregister(&dev->v4l2_dev);
1139 	kfree(dev);
1140 }
1141 
1142 static int msi2500_transfer_one_message(struct spi_master *master,
1143 					struct spi_message *m)
1144 {
1145 	struct msi2500_dev *dev = spi_master_get_devdata(master);
1146 	struct spi_transfer *t;
1147 	int ret = 0;
1148 	u32 data;
1149 
1150 	list_for_each_entry(t, &m->transfers, transfer_list) {
1151 		dev_dbg(dev->dev, "msg=%*ph\n", t->len, t->tx_buf);
1152 		data = 0x09; /* reg 9 is SPI adapter */
1153 		data |= ((u8 *)t->tx_buf)[0] << 8;
1154 		data |= ((u8 *)t->tx_buf)[1] << 16;
1155 		data |= ((u8 *)t->tx_buf)[2] << 24;
1156 		ret = msi2500_ctrl_msg(dev, CMD_WREG, data);
1157 	}
1158 
1159 	m->status = ret;
1160 	spi_finalize_current_message(master);
1161 	return ret;
1162 }
1163 
1164 static int msi2500_probe(struct usb_interface *intf,
1165 			 const struct usb_device_id *id)
1166 {
1167 	struct msi2500_dev *dev;
1168 	struct v4l2_subdev *sd;
1169 	struct spi_master *master;
1170 	int ret;
1171 	static struct spi_board_info board_info = {
1172 		.modalias		= "msi001",
1173 		.bus_num		= 0,
1174 		.chip_select		= 0,
1175 		.max_speed_hz		= 12000000,
1176 	};
1177 
1178 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1179 	if (!dev) {
1180 		ret = -ENOMEM;
1181 		goto err;
1182 	}
1183 
1184 	mutex_init(&dev->v4l2_lock);
1185 	mutex_init(&dev->vb_queue_lock);
1186 	spin_lock_init(&dev->queued_bufs_lock);
1187 	INIT_LIST_HEAD(&dev->queued_bufs);
1188 	dev->dev = &intf->dev;
1189 	dev->udev = interface_to_usbdev(intf);
1190 	dev->f_adc = bands[0].rangelow;
1191 	dev->pixelformat = formats[0].pixelformat;
1192 	dev->buffersize = formats[0].buffersize;
1193 	dev->num_formats = NUM_FORMATS;
1194 	if (!msi2500_emulated_fmt)
1195 		dev->num_formats -= 2;
1196 
1197 	/* Init videobuf2 queue structure */
1198 	dev->vb_queue.type = V4L2_BUF_TYPE_SDR_CAPTURE;
1199 	dev->vb_queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ;
1200 	dev->vb_queue.drv_priv = dev;
1201 	dev->vb_queue.buf_struct_size = sizeof(struct msi2500_frame_buf);
1202 	dev->vb_queue.ops = &msi2500_vb2_ops;
1203 	dev->vb_queue.mem_ops = &vb2_vmalloc_memops;
1204 	dev->vb_queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1205 	ret = vb2_queue_init(&dev->vb_queue);
1206 	if (ret) {
1207 		dev_err(dev->dev, "Could not initialize vb2 queue\n");
1208 		goto err_free_mem;
1209 	}
1210 
1211 	/* Init video_device structure */
1212 	dev->vdev = msi2500_template;
1213 	dev->vdev.queue = &dev->vb_queue;
1214 	dev->vdev.queue->lock = &dev->vb_queue_lock;
1215 	video_set_drvdata(&dev->vdev, dev);
1216 
1217 	/* Register the v4l2_device structure */
1218 	dev->v4l2_dev.release = msi2500_video_release;
1219 	ret = v4l2_device_register(&intf->dev, &dev->v4l2_dev);
1220 	if (ret) {
1221 		dev_err(dev->dev, "Failed to register v4l2-device (%d)\n", ret);
1222 		goto err_free_mem;
1223 	}
1224 
1225 	/* SPI master adapter */
1226 	master = spi_alloc_master(dev->dev, 0);
1227 	if (master == NULL) {
1228 		ret = -ENOMEM;
1229 		goto err_unregister_v4l2_dev;
1230 	}
1231 
1232 	dev->master = master;
1233 	master->bus_num = -1;
1234 	master->num_chipselect = 1;
1235 	master->transfer_one_message = msi2500_transfer_one_message;
1236 	spi_master_set_devdata(master, dev);
1237 	ret = spi_register_master(master);
1238 	if (ret) {
1239 		spi_master_put(master);
1240 		goto err_unregister_v4l2_dev;
1241 	}
1242 
1243 	/* load v4l2 subdevice */
1244 	sd = v4l2_spi_new_subdev(&dev->v4l2_dev, master, &board_info);
1245 	dev->v4l2_subdev = sd;
1246 	if (sd == NULL) {
1247 		dev_err(dev->dev, "cannot get v4l2 subdevice\n");
1248 		ret = -ENODEV;
1249 		goto err_unregister_master;
1250 	}
1251 
1252 	/* Register controls */
1253 	v4l2_ctrl_handler_init(&dev->hdl, 0);
1254 	if (dev->hdl.error) {
1255 		ret = dev->hdl.error;
1256 		dev_err(dev->dev, "Could not initialize controls\n");
1257 		goto err_free_controls;
1258 	}
1259 
1260 	/* currently all controls are from subdev */
1261 	v4l2_ctrl_add_handler(&dev->hdl, sd->ctrl_handler, NULL, true);
1262 
1263 	dev->v4l2_dev.ctrl_handler = &dev->hdl;
1264 	dev->vdev.v4l2_dev = &dev->v4l2_dev;
1265 	dev->vdev.lock = &dev->v4l2_lock;
1266 	dev->vdev.device_caps = V4L2_CAP_SDR_CAPTURE | V4L2_CAP_STREAMING |
1267 				V4L2_CAP_READWRITE | V4L2_CAP_TUNER;
1268 
1269 	ret = video_register_device(&dev->vdev, VFL_TYPE_SDR, -1);
1270 	if (ret) {
1271 		dev_err(dev->dev,
1272 			"Failed to register as video device (%d)\n", ret);
1273 		goto err_unregister_v4l2_dev;
1274 	}
1275 	dev_info(dev->dev, "Registered as %s\n",
1276 		 video_device_node_name(&dev->vdev));
1277 	dev_notice(dev->dev,
1278 		   "SDR API is still slightly experimental and functionality changes may follow\n");
1279 	return 0;
1280 err_free_controls:
1281 	v4l2_ctrl_handler_free(&dev->hdl);
1282 err_unregister_master:
1283 	spi_unregister_master(dev->master);
1284 err_unregister_v4l2_dev:
1285 	v4l2_device_unregister(&dev->v4l2_dev);
1286 err_free_mem:
1287 	kfree(dev);
1288 err:
1289 	return ret;
1290 }
1291 
1292 /* USB device ID list */
1293 static const struct usb_device_id msi2500_id_table[] = {
1294 	{USB_DEVICE(0x1df7, 0x2500)}, /* Mirics MSi3101 SDR Dongle */
1295 	{USB_DEVICE(0x2040, 0xd300)}, /* Hauppauge WinTV 133559 LF */
1296 	{}
1297 };
1298 MODULE_DEVICE_TABLE(usb, msi2500_id_table);
1299 
1300 /* USB subsystem interface */
1301 static struct usb_driver msi2500_driver = {
1302 	.name                     = KBUILD_MODNAME,
1303 	.probe                    = msi2500_probe,
1304 	.disconnect               = msi2500_disconnect,
1305 	.id_table                 = msi2500_id_table,
1306 };
1307 
1308 module_usb_driver(msi2500_driver);
1309 
1310 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
1311 MODULE_DESCRIPTION("Mirics MSi3101 SDR Dongle");
1312 MODULE_LICENSE("GPL");
1313