170 static int airspy_ctrl_msg(struct airspy *s, u8 request, u16 value, u16 index,  in airspy_ctrl_msg()  argument
180 		pipe = usb_sndctrlpipe(s->udev, 0);  in airspy_ctrl_msg()
191 		pipe = usb_rcvctrlpipe(s->udev, 0);  in airspy_ctrl_msg()
195 		dev_err(s->dev, "Unknown command %02x\n", request);  in airspy_ctrl_msg()
202 		memcpy(s->buf, data, size);  in airspy_ctrl_msg()
204 	ret = usb_control_msg(s->udev, pipe, request, requesttype, value,  in airspy_ctrl_msg()
205 			index, s->buf, size, 1000);  in airspy_ctrl_msg()
206 	airspy_dbg_usb_control_msg(s->dev, request, requesttype, value,  in airspy_ctrl_msg()
207 			index, s->buf, size);  in airspy_ctrl_msg()
209 		dev_err(s->dev, "usb_control_msg() failed %d request %02x\n",  in airspy_ctrl_msg()
216 		memcpy(data, s->buf, size);  in airspy_ctrl_msg()
224 static struct airspy_frame_buf *airspy_get_next_fill_buf(struct airspy *s)  in airspy_get_next_fill_buf()  argument
229 	spin_lock_irqsave(&s->queued_bufs_lock, flags);  in airspy_get_next_fill_buf()
230 	if (list_empty(&s->queued_bufs))  in airspy_get_next_fill_buf()
233 	buf = list_entry(s->queued_bufs.next,  in airspy_get_next_fill_buf()
237 	spin_unlock_irqrestore(&s->queued_bufs_lock, flags);  in airspy_get_next_fill_buf()
241 static unsigned int airspy_convert_stream(struct airspy *s,  in airspy_convert_stream()  argument
246 	if (s->pixelformat == V4L2_SDR_FMT_RU12LE) {  in airspy_convert_stream()
254 	if (unlikely(time_is_before_jiffies(s->jiffies_next))) {  in airspy_convert_stream()
257 				s->jiffies_next + msecs_to_jiffies(MSECS));  in airspy_convert_stream()
258 		unsigned int samples = s->sample - s->sample_measured;  in airspy_convert_stream()
260 		s->jiffies_next = jiffies + msecs_to_jiffies(MSECS);  in airspy_convert_stream()
261 		s->sample_measured = s->sample;  in airspy_convert_stream()
262 		dev_dbg(s->dev, "slen=%u samples=%u msecs=%u sample rate=%lu\n",  in airspy_convert_stream()
268 	s->sample += src_len / 2;  in airspy_convert_stream()
279 	struct airspy *s = urb->context;  in airspy_urb_complete()  local
282 	dev_dbg_ratelimited(s->dev, "status=%d length=%d/%d errors=%d\n",  in airspy_urb_complete()
295 		dev_err_ratelimited(s->dev, "URB failed %d\n", urb->status);  in airspy_urb_complete()
303 		fbuf = airspy_get_next_fill_buf(s);  in airspy_urb_complete()
305 			s->vb_full++;  in airspy_urb_complete()
306 			dev_notice_ratelimited(s->dev,  in airspy_urb_complete()
308 					s->vb_full);  in airspy_urb_complete()
314 		len = airspy_convert_stream(s, ptr, urb->transfer_buffer,  in airspy_urb_complete()
318 		fbuf->vb.v4l2_buf.sequence = s->sequence++;  in airspy_urb_complete()
325 static int airspy_kill_urbs(struct airspy *s)  in airspy_kill_urbs()  argument
329 	for (i = s->urbs_submitted - 1; i >= 0; i--) {  in airspy_kill_urbs()
330 		dev_dbg(s->dev, "kill urb=%d\n", i);  in airspy_kill_urbs()
332 		usb_kill_urb(s->urb_list[i]);  in airspy_kill_urbs()
334 	s->urbs_submitted = 0;  in airspy_kill_urbs()
339 static int airspy_submit_urbs(struct airspy *s)  in airspy_submit_urbs()  argument
343 	for (i = 0; i < s->urbs_initialized; i++) {  in airspy_submit_urbs()
344 		dev_dbg(s->dev, "submit urb=%d\n", i);  in airspy_submit_urbs()
345 		ret = usb_submit_urb(s->urb_list[i], GFP_ATOMIC);  in airspy_submit_urbs()
347 			dev_err(s->dev, "Could not submit URB no. %d - get them all back\n",  in airspy_submit_urbs()
349 			airspy_kill_urbs(s);  in airspy_submit_urbs()
352 		s->urbs_submitted++;  in airspy_submit_urbs()
358 static int airspy_free_stream_bufs(struct airspy *s)  in airspy_free_stream_bufs()  argument
360 	if (s->flags & USB_STATE_URB_BUF) {  in airspy_free_stream_bufs()
361 		while (s->buf_num) {  in airspy_free_stream_bufs()
362 			s->buf_num--;  in airspy_free_stream_bufs()
363 			dev_dbg(s->dev, "free buf=%d\n", s->buf_num);  in airspy_free_stream_bufs()
364 			usb_free_coherent(s->udev, s->buf_size,  in airspy_free_stream_bufs()
365 					  s->buf_list[s->buf_num],  in airspy_free_stream_bufs()
366 					  s->dma_addr[s->buf_num]);  in airspy_free_stream_bufs()
369 	s->flags &= ~USB_STATE_URB_BUF;  in airspy_free_stream_bufs()
374 static int airspy_alloc_stream_bufs(struct airspy *s)  in airspy_alloc_stream_bufs()  argument
376 	s->buf_num = 0;  in airspy_alloc_stream_bufs()
377 	s->buf_size = BULK_BUFFER_SIZE;  in airspy_alloc_stream_bufs()
379 	dev_dbg(s->dev, "all in all I will use %u bytes for streaming\n",  in airspy_alloc_stream_bufs()
382 	for (s->buf_num = 0; s->buf_num < MAX_BULK_BUFS; s->buf_num++) {  in airspy_alloc_stream_bufs()
383 		s->buf_list[s->buf_num] = usb_alloc_coherent(s->udev,  in airspy_alloc_stream_bufs()
385 				&s->dma_addr[s->buf_num]);  in airspy_alloc_stream_bufs()
386 		if (!s->buf_list[s->buf_num]) {  in airspy_alloc_stream_bufs()
387 			dev_dbg(s->dev, "alloc buf=%d failed\n", s->buf_num);  in airspy_alloc_stream_bufs()
388 			airspy_free_stream_bufs(s);  in airspy_alloc_stream_bufs()
392 		dev_dbg(s->dev, "alloc buf=%d %p (dma %llu)\n", s->buf_num,  in airspy_alloc_stream_bufs()
393 				s->buf_list[s->buf_num],  in airspy_alloc_stream_bufs()
394 				(long long)s->dma_addr[s->buf_num]);  in airspy_alloc_stream_bufs()
395 		s->flags |= USB_STATE_URB_BUF;  in airspy_alloc_stream_bufs()
401 static int airspy_free_urbs(struct airspy *s)  in airspy_free_urbs()  argument
405 	airspy_kill_urbs(s);  in airspy_free_urbs()
407 	for (i = s->urbs_initialized - 1; i >= 0; i--) {  in airspy_free_urbs()
408 		if (s->urb_list[i]) {  in airspy_free_urbs()
409 			dev_dbg(s->dev, "free urb=%d\n", i);  in airspy_free_urbs()
411 			usb_free_urb(s->urb_list[i]);  in airspy_free_urbs()
414 	s->urbs_initialized = 0;  in airspy_free_urbs()
419 static int airspy_alloc_urbs(struct airspy *s)  in airspy_alloc_urbs()  argument
425 		dev_dbg(s->dev, "alloc urb=%d\n", i);  in airspy_alloc_urbs()
426 		s->urb_list[i] = usb_alloc_urb(0, GFP_ATOMIC);  in airspy_alloc_urbs()
427 		if (!s->urb_list[i]) {  in airspy_alloc_urbs()
428 			dev_dbg(s->dev, "failed\n");  in airspy_alloc_urbs()
430 				usb_free_urb(s->urb_list[j]);  in airspy_alloc_urbs()
433 		usb_fill_bulk_urb(s->urb_list[i],  in airspy_alloc_urbs()
434 				s->udev,  in airspy_alloc_urbs()
435 				usb_rcvbulkpipe(s->udev, 0x81),  in airspy_alloc_urbs()
436 				s->buf_list[i],  in airspy_alloc_urbs()
438 				airspy_urb_complete, s);  in airspy_alloc_urbs()
440 		s->urb_list[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;  in airspy_alloc_urbs()
441 		s->urb_list[i]->transfer_dma = s->dma_addr[i];  in airspy_alloc_urbs()
442 		s->urbs_initialized++;  in airspy_alloc_urbs()
449 static void airspy_cleanup_queued_bufs(struct airspy *s)  in airspy_cleanup_queued_bufs()  argument
453 	dev_dbg(s->dev, "\n");  in airspy_cleanup_queued_bufs()
455 	spin_lock_irqsave(&s->queued_bufs_lock, flags);  in airspy_cleanup_queued_bufs()
456 	while (!list_empty(&s->queued_bufs)) {  in airspy_cleanup_queued_bufs()
459 		buf = list_entry(s->queued_bufs.next,  in airspy_cleanup_queued_bufs()
464 	spin_unlock_irqrestore(&s->queued_bufs_lock, flags);  in airspy_cleanup_queued_bufs()
471 	struct airspy *s = container_of(v, struct airspy, v4l2_dev);  in airspy_disconnect()  local
473 	dev_dbg(s->dev, "\n");  in airspy_disconnect()
475 	mutex_lock(&s->vb_queue_lock);  in airspy_disconnect()
476 	mutex_lock(&s->v4l2_lock);  in airspy_disconnect()
478 	s->udev = NULL;  in airspy_disconnect()
479 	v4l2_device_disconnect(&s->v4l2_dev);  in airspy_disconnect()
480 	video_unregister_device(&s->vdev);  in airspy_disconnect()
481 	mutex_unlock(&s->v4l2_lock);  in airspy_disconnect()
482 	mutex_unlock(&s->vb_queue_lock);  in airspy_disconnect()
484 	v4l2_device_put(&s->v4l2_dev);  in airspy_disconnect()
492 	struct airspy *s = vb2_get_drv_priv(vq);  in airspy_queue_setup()  local
494 	dev_dbg(s->dev, "nbuffers=%d\n", *nbuffers);  in airspy_queue_setup()
500 	sizes[0] = PAGE_ALIGN(s->buffersize);  in airspy_queue_setup()
502 	dev_dbg(s->dev, "nbuffers=%d sizes[0]=%d\n", *nbuffers, sizes[0]);  in airspy_queue_setup()
508 	struct airspy *s = vb2_get_drv_priv(vb->vb2_queue);  in airspy_buf_queue()  local
514 	if (unlikely(!s->udev)) {  in airspy_buf_queue()
519 	spin_lock_irqsave(&s->queued_bufs_lock, flags);  in airspy_buf_queue()
520 	list_add_tail(&buf->list, &s->queued_bufs);  in airspy_buf_queue()
521 	spin_unlock_irqrestore(&s->queued_bufs_lock, flags);  in airspy_buf_queue()
526 	struct airspy *s = vb2_get_drv_priv(vq);  in airspy_start_streaming()  local
529 	dev_dbg(s->dev, "\n");  in airspy_start_streaming()
531 	if (!s->udev)  in airspy_start_streaming()
534 	mutex_lock(&s->v4l2_lock);  in airspy_start_streaming()
536 	s->sequence = 0;  in airspy_start_streaming()
538 	set_bit(POWER_ON, &s->flags);  in airspy_start_streaming()
540 	ret = airspy_alloc_stream_bufs(s);  in airspy_start_streaming()
544 	ret = airspy_alloc_urbs(s);  in airspy_start_streaming()
548 	ret = airspy_submit_urbs(s);  in airspy_start_streaming()
553 	ret = airspy_ctrl_msg(s, CMD_RECEIVER_MODE, 1, 0, NULL, 0);  in airspy_start_streaming()
560 	airspy_kill_urbs(s);  in airspy_start_streaming()
562 	airspy_free_urbs(s);  in airspy_start_streaming()
564 	airspy_free_stream_bufs(s);  in airspy_start_streaming()
566 	clear_bit(POWER_ON, &s->flags);  in airspy_start_streaming()
572 		list_for_each_entry_safe(buf, tmp, &s->queued_bufs, list) {  in airspy_start_streaming()
579 	mutex_unlock(&s->v4l2_lock);  in airspy_start_streaming()
586 	struct airspy *s = vb2_get_drv_priv(vq);  in airspy_stop_streaming()  local
588 	dev_dbg(s->dev, "\n");  in airspy_stop_streaming()
590 	mutex_lock(&s->v4l2_lock);  in airspy_stop_streaming()
593 	airspy_ctrl_msg(s, CMD_RECEIVER_MODE, 0, 0, NULL, 0);  in airspy_stop_streaming()
595 	airspy_kill_urbs(s);  in airspy_stop_streaming()
596 	airspy_free_urbs(s);  in airspy_stop_streaming()
597 	airspy_free_stream_bufs(s);  in airspy_stop_streaming()
599 	airspy_cleanup_queued_bufs(s);  in airspy_stop_streaming()
601 	clear_bit(POWER_ON, &s->flags);  in airspy_stop_streaming()
603 	mutex_unlock(&s->v4l2_lock);  in airspy_stop_streaming()
618 	struct airspy *s = video_drvdata(file);  in airspy_querycap()  local
621 	strlcpy(cap->card, s->vdev.name, sizeof(cap->card));  in airspy_querycap()
622 	usb_make_path(s->udev, cap->bus_info, sizeof(cap->bus_info));  in airspy_querycap()
645 	struct airspy *s = video_drvdata(file);  in airspy_g_fmt_sdr_cap()  local
647 	f->fmt.sdr.pixelformat = s->pixelformat;  in airspy_g_fmt_sdr_cap()
648 	f->fmt.sdr.buffersize = s->buffersize;  in airspy_g_fmt_sdr_cap()
657 	struct airspy *s = video_drvdata(file);  in airspy_s_fmt_sdr_cap()  local
658 	struct vb2_queue *q = &s->vb_queue;  in airspy_s_fmt_sdr_cap()
667 			s->pixelformat = formats[i].pixelformat;  in airspy_s_fmt_sdr_cap()
668 			s->buffersize = formats[i].buffersize;  in airspy_s_fmt_sdr_cap()
674 	s->pixelformat = formats[0].pixelformat;  in airspy_s_fmt_sdr_cap()
675 	s->buffersize = formats[0].buffersize;  in airspy_s_fmt_sdr_cap()
744 	struct airspy *s = video_drvdata(file);  in airspy_g_frequency()  local
749 		f->frequency = s->f_adc;  in airspy_g_frequency()
750 		dev_dbg(s->dev, "ADC frequency=%u Hz\n", s->f_adc);  in airspy_g_frequency()
754 		f->frequency = s->f_rf;  in airspy_g_frequency()
755 		dev_dbg(s->dev, "RF frequency=%u Hz\n", s->f_rf);  in airspy_g_frequency()
767 	struct airspy *s = video_drvdata(file);  in airspy_s_frequency()  local
772 		s->f_adc = clamp_t(unsigned int, f->frequency,  in airspy_s_frequency()
775 		dev_dbg(s->dev, "ADC frequency=%u Hz\n", s->f_adc);  in airspy_s_frequency()
778 		s->f_rf = clamp_t(unsigned int, f->frequency,  in airspy_s_frequency()
781 		dev_dbg(s->dev, "RF frequency=%u Hz\n", s->f_rf);  in airspy_s_frequency()
782 		buf[0] = (s->f_rf >>  0) & 0xff;  in airspy_s_frequency()
783 		buf[1] = (s->f_rf >>  8) & 0xff;  in airspy_s_frequency()
784 		buf[2] = (s->f_rf >> 16) & 0xff;  in airspy_s_frequency()
785 		buf[3] = (s->f_rf >> 24) & 0xff;  in airspy_s_frequency()
786 		ret = airspy_ctrl_msg(s, CMD_SET_FREQ, 0, 0, buf, 4);  in airspy_s_frequency()
869 	struct airspy *s = container_of(v, struct airspy, v4l2_dev);  in airspy_video_release()  local
871 	v4l2_ctrl_handler_free(&s->hdl);  in airspy_video_release()
872 	v4l2_device_unregister(&s->v4l2_dev);  in airspy_video_release()
873 	kfree(s);  in airspy_video_release()
876 static int airspy_set_lna_gain(struct airspy *s)  in airspy_set_lna_gain()  argument
881 	dev_dbg(s->dev, "lna auto=%d->%d val=%d->%d\n",  in airspy_set_lna_gain()
882 			s->lna_gain_auto->cur.val, s->lna_gain_auto->val,  in airspy_set_lna_gain()
883 			s->lna_gain->cur.val, s->lna_gain->val);  in airspy_set_lna_gain()
885 	ret = airspy_ctrl_msg(s, CMD_SET_LNA_AGC, 0, s->lna_gain_auto->val,  in airspy_set_lna_gain()
890 	if (s->lna_gain_auto->val == false) {  in airspy_set_lna_gain()
891 		ret = airspy_ctrl_msg(s, CMD_SET_LNA_GAIN, 0, s->lna_gain->val,  in airspy_set_lna_gain()
898 		dev_dbg(s->dev, "failed=%d\n", ret);  in airspy_set_lna_gain()
903 static int airspy_set_mixer_gain(struct airspy *s)  in airspy_set_mixer_gain()  argument
908 	dev_dbg(s->dev, "mixer auto=%d->%d val=%d->%d\n",  in airspy_set_mixer_gain()
909 			s->mixer_gain_auto->cur.val, s->mixer_gain_auto->val,  in airspy_set_mixer_gain()
910 			s->mixer_gain->cur.val, s->mixer_gain->val);  in airspy_set_mixer_gain()
912 	ret = airspy_ctrl_msg(s, CMD_SET_MIXER_AGC, 0, s->mixer_gain_auto->val,  in airspy_set_mixer_gain()
917 	if (s->mixer_gain_auto->val == false) {  in airspy_set_mixer_gain()
918 		ret = airspy_ctrl_msg(s, CMD_SET_MIXER_GAIN, 0,  in airspy_set_mixer_gain()
919 				s->mixer_gain->val, &u8tmp, 1);  in airspy_set_mixer_gain()
925 		dev_dbg(s->dev, "failed=%d\n", ret);  in airspy_set_mixer_gain()
930 static int airspy_set_if_gain(struct airspy *s)  in airspy_set_if_gain()  argument
935 	dev_dbg(s->dev, "val=%d->%d\n", s->if_gain->cur.val, s->if_gain->val);  in airspy_set_if_gain()
937 	ret = airspy_ctrl_msg(s, CMD_SET_VGA_GAIN, 0, s->if_gain->val,  in airspy_set_if_gain()
943 		dev_dbg(s->dev, "failed=%d\n", ret);  in airspy_set_if_gain()
950 	struct airspy *s = container_of(ctrl->handler, struct airspy, hdl);  in airspy_s_ctrl()  local
956 		ret = airspy_set_lna_gain(s);  in airspy_s_ctrl()
960 		ret = airspy_set_mixer_gain(s);  in airspy_s_ctrl()
963 		ret = airspy_set_if_gain(s);  in airspy_s_ctrl()
966 		dev_dbg(s->dev, "unknown ctrl: id=%d name=%s\n",  in airspy_s_ctrl()
981 	struct airspy *s;  in airspy_probe()  local
985 	s = kzalloc(sizeof(struct airspy), GFP_KERNEL);  in airspy_probe()
986 	if (s == NULL) {  in airspy_probe()
991 	mutex_init(&s->v4l2_lock);  in airspy_probe()
992 	mutex_init(&s->vb_queue_lock);  in airspy_probe()
993 	spin_lock_init(&s->queued_bufs_lock);  in airspy_probe()
994 	INIT_LIST_HEAD(&s->queued_bufs);  in airspy_probe()
995 	s->dev = &intf->dev;  in airspy_probe()
996 	s->udev = interface_to_usbdev(intf);  in airspy_probe()
997 	s->f_adc = bands[0].rangelow;  in airspy_probe()
998 	s->f_rf = bands_rf[0].rangelow;  in airspy_probe()
999 	s->pixelformat = formats[0].pixelformat;  in airspy_probe()
1000 	s->buffersize = formats[0].buffersize;  in airspy_probe()
1003 	ret = airspy_ctrl_msg(s, CMD_BOARD_ID_READ, 0, 0, &u8tmp, 1);  in airspy_probe()
1005 		ret = airspy_ctrl_msg(s, CMD_VERSION_STRING_READ, 0, 0,  in airspy_probe()
1008 		dev_err(s->dev, "Could not detect board\n");  in airspy_probe()
1014 	dev_info(s->dev, "Board ID: %02x\n", u8tmp);  in airspy_probe()
1015 	dev_info(s->dev, "Firmware version: %s\n", buf);  in airspy_probe()
1018 	s->vb_queue.type = V4L2_BUF_TYPE_SDR_CAPTURE;  in airspy_probe()
1019 	s->vb_queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ;  in airspy_probe()
1020 	s->vb_queue.drv_priv = s;  in airspy_probe()
1021 	s->vb_queue.buf_struct_size = sizeof(struct airspy_frame_buf);  in airspy_probe()
1022 	s->vb_queue.ops = &airspy_vb2_ops;  in airspy_probe()
1023 	s->vb_queue.mem_ops = &vb2_vmalloc_memops;  in airspy_probe()
1024 	s->vb_queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;  in airspy_probe()
1025 	ret = vb2_queue_init(&s->vb_queue);  in airspy_probe()
1027 		dev_err(s->dev, "Could not initialize vb2 queue\n");  in airspy_probe()
1032 	s->vdev = airspy_template;  in airspy_probe()
1033 	s->vdev.queue = &s->vb_queue;  in airspy_probe()
1034 	s->vdev.queue->lock = &s->vb_queue_lock;  in airspy_probe()
1035 	video_set_drvdata(&s->vdev, s);  in airspy_probe()
1038 	s->v4l2_dev.release = airspy_video_release;  in airspy_probe()
1039 	ret = v4l2_device_register(&intf->dev, &s->v4l2_dev);  in airspy_probe()
1041 		dev_err(s->dev, "Failed to register v4l2-device (%d)\n", ret);  in airspy_probe()
1046 	v4l2_ctrl_handler_init(&s->hdl, 5);  in airspy_probe()
1047 	s->lna_gain_auto = v4l2_ctrl_new_std(&s->hdl, &airspy_ctrl_ops,  in airspy_probe()
1049 	s->lna_gain = v4l2_ctrl_new_std(&s->hdl, &airspy_ctrl_ops,  in airspy_probe()
1051 	v4l2_ctrl_auto_cluster(2, &s->lna_gain_auto, 0, false);  in airspy_probe()
1052 	s->mixer_gain_auto = v4l2_ctrl_new_std(&s->hdl, &airspy_ctrl_ops,  in airspy_probe()
1054 	s->mixer_gain = v4l2_ctrl_new_std(&s->hdl, &airspy_ctrl_ops,  in airspy_probe()
1056 	v4l2_ctrl_auto_cluster(2, &s->mixer_gain_auto, 0, false);  in airspy_probe()
1057 	s->if_gain = v4l2_ctrl_new_std(&s->hdl, &airspy_ctrl_ops,  in airspy_probe()
1059 	if (s->hdl.error) {  in airspy_probe()
1060 		ret = s->hdl.error;  in airspy_probe()
1061 		dev_err(s->dev, "Could not initialize controls\n");  in airspy_probe()
1065 	v4l2_ctrl_handler_setup(&s->hdl);  in airspy_probe()
1067 	s->v4l2_dev.ctrl_handler = &s->hdl;  in airspy_probe()
1068 	s->vdev.v4l2_dev = &s->v4l2_dev;  in airspy_probe()
1069 	s->vdev.lock = &s->v4l2_lock;  in airspy_probe()
1071 	ret = video_register_device(&s->vdev, VFL_TYPE_SDR, -1);  in airspy_probe()
1073 		dev_err(s->dev, "Failed to register as video device (%d)\n",  in airspy_probe()
1077 	dev_info(s->dev, "Registered as %s\n",  in airspy_probe()
1078 			video_device_node_name(&s->vdev));  in airspy_probe()
1079 …dev_notice(s->dev, "SDR API is still slightly experimental and functionality changes may follow\n"…  in airspy_probe()
1083 	v4l2_ctrl_handler_free(&s->hdl);  in airspy_probe()
1085 	v4l2_device_unregister(&s->v4l2_dev);  in airspy_probe()
1087 	kfree(s);  in airspy_probe()