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[media] hackrf: add control for RF amplifier 

There is Avago MGA-81563 amplifier just right after antenna connector.
It could be turned on/off and its gain is around 12dB.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Antti Palosaari 2015-10-10 13:51:04 -03:00 committed by Mauro Carvalho Chehab
parent 486dc9e59f
commit b3ae29667e
1 changed files with 25 additions and 1 deletions
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26
drivers/media/usb/hackrf/hackrf.c
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@ -32,6 +32,7 @@ enum {
CMD_BOARD_ID_READ = 0x0e,
CMD_VERSION_STRING_READ = 0x0f,
CMD_SET_FREQ = 0x10,
CMD_AMP_ENABLE = 0x11,
CMD_SET_LNA_GAIN = 0x13,
CMD_SET_VGA_GAIN = 0x14,
};
@ -135,6 +136,7 @@ struct hackrf_dev {
struct v4l2_ctrl_handler hdl;
struct v4l2_ctrl *bandwidth_auto;
struct v4l2_ctrl *bandwidth;
struct v4l2_ctrl *rf_gain;
struct v4l2_ctrl *lna_gain;
struct v4l2_ctrl *if_gain;
@ -166,6 +168,7 @@ static int hackrf_ctrl_msg(struct hackrf_dev *dev, u8 request, u16 value,
switch (request) {
case CMD_SET_TRANSCEIVER_MODE:
case CMD_SET_FREQ:
case CMD_AMP_ENABLE:
case CMD_SAMPLE_RATE_SET:
case CMD_BASEBAND_FILTER_BANDWIDTH_SET:
pipe = usb_sndctrlpipe(dev->udev, 0);
@ -953,6 +956,22 @@ static int hackrf_set_bandwidth(struct hackrf_dev *dev)
return ret;
}
static int hackrf_set_rf_gain(struct hackrf_dev *dev)
{
int ret;
u8 u8tmp;
dev_dbg(dev->dev, "rf val=%d->%d\n",
dev->rf_gain->cur.val, dev->rf_gain->val);
u8tmp = (dev->rf_gain->val) ? 1 : 0;
ret = hackrf_ctrl_msg(dev, CMD_AMP_ENABLE, u8tmp, 0, NULL, 0);
if (ret)
dev_dbg(dev->dev, "failed=%d\n", ret);
return ret;
}
static int hackrf_set_lna_gain(struct hackrf_dev *dev)
{
int ret;
@ -996,6 +1015,9 @@ static int hackrf_s_ctrl(struct v4l2_ctrl *ctrl)
case V4L2_CID_RF_TUNER_BANDWIDTH:
ret = hackrf_set_bandwidth(dev);
break;
case V4L2_CID_RF_TUNER_RF_GAIN:
ret = hackrf_set_rf_gain(dev);
break;
case V4L2_CID_RF_TUNER_LNA_GAIN:
ret = hackrf_set_lna_gain(dev);
break;
@ -1081,13 +1103,15 @@ static int hackrf_probe(struct usb_interface *intf,
}
/* Register controls */
v4l2_ctrl_handler_init(&dev->hdl, 4);
v4l2_ctrl_handler_init(&dev->hdl, 5);
dev->bandwidth_auto = v4l2_ctrl_new_std(&dev->hdl, &hackrf_ctrl_ops,
V4L2_CID_RF_TUNER_BANDWIDTH_AUTO, 0, 1, 1, 1);
dev->bandwidth = v4l2_ctrl_new_std(&dev->hdl, &hackrf_ctrl_ops,
V4L2_CID_RF_TUNER_BANDWIDTH,
1750000, 28000000, 50000, 1750000);
v4l2_ctrl_auto_cluster(2, &dev->bandwidth_auto, 0, false);
dev->rf_gain = v4l2_ctrl_new_std(&dev->hdl, &hackrf_ctrl_ops,
V4L2_CID_RF_TUNER_RF_GAIN, 0, 12, 12, 0);
dev->lna_gain = v4l2_ctrl_new_std(&dev->hdl, &hackrf_ctrl_ops,
V4L2_CID_RF_TUNER_LNA_GAIN, 0, 40, 8, 0);
dev->if_gain = v4l2_ctrl_new_std(&dev->hdl, &hackrf_ctrl_ops,