[media] rtl2832_sdr: fixing v4l2-compliance issues

Fix rtl2832_sdr driver v4l2-compliance issues.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/staging/media/rtl2832u_sdr/rtl2832_sdr.c

@@ -118,6 +118,7 @@ struct rtl2832_sdr_state {
 	struct vb2_queue vb_queue;
 	struct list_head queued_bufs;
 	spinlock_t queued_bufs_lock; /* Protects queued_bufs */
+	unsigned sequence;	     /* buffer sequence counter */
 
 	/* Note if taking both locks v4l2_lock must always be locked first! */
 	struct mutex v4l2_lock;      /* Protects everything else */
@@ -413,6 +414,8 @@ static void rtl2832_sdr_urb_complete(struct urb *urb)
 		len = rtl2832_sdr_convert_stream(s, ptr, urb->transfer_buffer,
 				urb->actual_length);
 		vb2_set_plane_payload(&fbuf->vb, 0, len);
+		v4l2_get_timestamp(&fbuf->vb.v4l2_buf.timestamp);
+		fbuf->vb.v4l2_buf.sequence = s->sequence++;
 		vb2_buffer_done(&fbuf->vb, VB2_BUF_STATE_DONE);
 	}
 skip:
@@ -609,8 +612,9 @@ static int rtl2832_sdr_queue_setup(struct vb2_queue *vq,
 	struct rtl2832_sdr_state *s = vb2_get_drv_priv(vq);
 	dev_dbg(&s->udev->dev, "%s: *nbuffers=%d\n", __func__, *nbuffers);
 
-	/* Absolute min and max number of buffers available for mmap() */
-	*nbuffers = clamp_t(unsigned int, *nbuffers, 8, 32);
+	/* Need at least 8 buffers */
+	if (vq->num_buffers + *nbuffers < 8)
+		*nbuffers = 8 - vq->num_buffers;
 	*nplanes = 1;
 	/* 2 = max 16-bit sample returned */
 	sizes[0] = PAGE_ALIGN(BULK_BUFFER_SIZE * 2);
@@ -1011,6 +1015,8 @@ static int rtl2832_sdr_start_streaming(struct vb2_queue *vq, unsigned int count)
 	if (ret)
 		goto err;
 
+	s->sequence = 0;
+
 	ret = rtl2832_sdr_submit_urbs(s);
 	if (ret)
 		goto err;
@@ -1088,6 +1094,8 @@ static int rtl2832_sdr_s_tuner(struct file *file, void *priv,
 	struct rtl2832_sdr_state *s = video_drvdata(file);
 	dev_dbg(&s->udev->dev, "%s:\n", __func__);
 
+	if (v->index > 1)
+		return -EINVAL;
 	return 0;
 }
 
@@ -1123,12 +1131,15 @@ static int rtl2832_sdr_g_frequency(struct file *file, void *priv,
 	dev_dbg(&s->udev->dev, "%s: tuner=%d type=%d\n",
 			__func__, f->tuner, f->type);
 
-	if (f->tuner == 0)
+	if (f->tuner == 0) {
 		f->frequency = s->f_adc;
-	else if (f->tuner == 1)
+		f->type = V4L2_TUNER_ADC;
+	} else if (f->tuner == 1) {
 		f->frequency = s->f_tuner;
-	else
+		f->type = V4L2_TUNER_RF;
+	} else {
 		return -EINVAL;
+	}
 
 	return ret;
 }
@@ -1162,7 +1173,9 @@ static int rtl2832_sdr_s_frequency(struct file *file, void *priv,
 				__func__, s->f_adc);
 		ret = rtl2832_sdr_set_adc(s);
 	} else if (f->tuner == 1) {
-		s->f_tuner = f->frequency;
+		s->f_tuner = clamp_t(unsigned int, f->frequency,
+				bands_fm[0].rangelow,
+				bands_fm[0].rangehigh);
 		dev_dbg(&s->udev->dev, "%s: RF frequency=%u Hz\n",
 				__func__, f->frequency);
 
@@ -1196,6 +1209,7 @@ static int rtl2832_sdr_g_fmt_sdr_cap(struct file *file, void *priv,
 	dev_dbg(&s->udev->dev, "%s:\n", __func__);
 
 	f->fmt.sdr.pixelformat = s->pixelformat;
+	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
 
 	return 0;
 }
@@ -1212,6 +1226,7 @@ static int rtl2832_sdr_s_fmt_sdr_cap(struct file *file, void *priv,
 	if (vb2_is_busy(q))
 		return -EBUSY;
 
+	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
 	for (i = 0; i < NUM_FORMATS; i++) {
 		if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
 			s->pixelformat = f->fmt.sdr.pixelformat;
@@ -1233,6 +1248,7 @@ static int rtl2832_sdr_try_fmt_sdr_cap(struct file *file, void *priv,
 	dev_dbg(&s->udev->dev, "%s: pixelformat fourcc %4.4s\n", __func__,
 			(char *)&f->fmt.sdr.pixelformat);
 
+	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
 	for (i = 0; i < NUM_FORMATS; i++) {
 		if (formats[i].pixelformat == f->fmt.sdr.pixelformat)
 			return 0;
@@ -1363,6 +1379,7 @@ struct dvb_frontend *rtl2832_sdr_attach(struct dvb_frontend *fe,
 	s->i2c = i2c;
 	s->cfg = cfg;
 	s->f_adc = bands_adc[0].rangelow;
+	s->f_tuner = bands_fm[0].rangelow;
 	s->pixelformat =  V4L2_SDR_FMT_CU8;
 
 	mutex_init(&s->v4l2_lock);