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hackrf.c
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hackrf.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* HackRF driver
*
* Copyright (C) 2014 Antti Palosaari <[email protected]>
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include <media/videobuf2-v4l2.h>
#include <media/videobuf2-vmalloc.h>
/*
* Used Avago MGA-81563 RF amplifier could be destroyed pretty easily with too
* strong signal or transmitting to bad antenna.
* Set RF gain control to 'grabbed' state by default for sure.
*/
static bool hackrf_enable_rf_gain_ctrl;
module_param_named(enable_rf_gain_ctrl, hackrf_enable_rf_gain_ctrl, bool, 0644);
MODULE_PARM_DESC(enable_rf_gain_ctrl, "enable RX/TX RF amplifier control (warn: could damage amplifier)");
/* HackRF USB API commands (from HackRF Library) */
enum {
CMD_SET_TRANSCEIVER_MODE = 0x01,
CMD_SAMPLE_RATE_SET = 0x06,
CMD_BASEBAND_FILTER_BANDWIDTH_SET = 0x07,
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,
CMD_SET_TXVGA_GAIN = 0x15,
};
/*
* bEndpointAddress 0x81 EP 1 IN
* Transfer Type Bulk
* wMaxPacketSize 0x0200 1x 512 bytes
*/
#define MAX_BULK_BUFS (6)
#define BULK_BUFFER_SIZE (128 * 512)
static const struct v4l2_frequency_band bands_adc_dac[] = {
{
.tuner = 0,
.type = V4L2_TUNER_SDR,
.index = 0,
.capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
.rangelow = 200000,
.rangehigh = 24000000,
},
};
static const struct v4l2_frequency_band bands_rx_tx[] = {
{
.tuner = 1,
.type = V4L2_TUNER_RF,
.index = 0,
.capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
.rangelow = 1,
.rangehigh = 4294967294LL, /* max u32, hw goes over 7GHz */
},
};
/* stream formats */
struct hackrf_format {
u32 pixelformat;
u32 buffersize;
};
/* format descriptions for capture and preview */
static struct hackrf_format formats[] = {
{
.pixelformat = V4L2_SDR_FMT_CS8,
.buffersize = BULK_BUFFER_SIZE,
},
};
static const unsigned int NUM_FORMATS = ARRAY_SIZE(formats);
/* intermediate buffers with raw data from the USB device */
struct hackrf_buffer {
struct vb2_v4l2_buffer vb;
struct list_head list;
};
struct hackrf_dev {
#define USB_STATE_URB_BUF 1 /* XXX: set manually */
#define RX_ON 4
#define TX_ON 5
#define RX_ADC_FREQUENCY 11
#define TX_DAC_FREQUENCY 12
#define RX_BANDWIDTH 13
#define TX_BANDWIDTH 14
#define RX_RF_FREQUENCY 15
#define TX_RF_FREQUENCY 16
#define RX_RF_GAIN 17
#define TX_RF_GAIN 18
#define RX_IF_GAIN 19
#define RX_LNA_GAIN 20
#define TX_LNA_GAIN 21
unsigned long flags;
struct usb_interface *intf;
struct device *dev;
struct usb_device *udev;
struct video_device rx_vdev;
struct video_device tx_vdev;
struct v4l2_device v4l2_dev;
/* videobuf2 queue and queued buffers list */
struct vb2_queue rx_vb2_queue;
struct vb2_queue tx_vb2_queue;
struct list_head rx_buffer_list;
struct list_head tx_buffer_list;
spinlock_t buffer_list_lock; /* Protects buffer_list */
unsigned int sequence; /* Buffer sequence counter */
unsigned int vb_full; /* vb is full and packets dropped */
unsigned int vb_empty; /* vb is empty and packets dropped */
/* Note if taking both locks v4l2_lock must always be locked first! */
struct mutex v4l2_lock; /* Protects everything else */
struct mutex vb_queue_lock; /* Protects vb_queue */
struct urb *urb_list[MAX_BULK_BUFS];
int buf_num;
unsigned long buf_size;
u8 *buf_list[MAX_BULK_BUFS];
dma_addr_t dma_addr[MAX_BULK_BUFS];
int urbs_initialized;
int urbs_submitted;
/* USB control message buffer */
#define BUF_SIZE 24
u8 buf[BUF_SIZE];
/* Current configuration */
unsigned int f_adc;
unsigned int f_dac;
unsigned int f_rx;
unsigned int f_tx;
u32 pixelformat;
u32 buffersize;
/* Controls */
struct v4l2_ctrl_handler rx_ctrl_handler;
struct v4l2_ctrl *rx_bandwidth_auto;
struct v4l2_ctrl *rx_bandwidth;
struct v4l2_ctrl *rx_rf_gain;
struct v4l2_ctrl *rx_lna_gain;
struct v4l2_ctrl *rx_if_gain;
struct v4l2_ctrl_handler tx_ctrl_handler;
struct v4l2_ctrl *tx_bandwidth_auto;
struct v4l2_ctrl *tx_bandwidth;
struct v4l2_ctrl *tx_rf_gain;
struct v4l2_ctrl *tx_lna_gain;
/* Sample rate calc */
unsigned long jiffies_next;
unsigned int sample;
unsigned int sample_measured;
};
#define hackrf_dbg_usb_control_msg(_dev, _r, _t, _v, _i, _b, _l) { \
char *_direction; \
if (_t & USB_DIR_IN) \
_direction = "<<<"; \
else \
_direction = ">>>"; \
dev_dbg(_dev, "%02x %02x %02x %02x %02x %02x %02x %02x %s %*ph\n", \
_t, _r, _v & 0xff, _v >> 8, _i & 0xff, \
_i >> 8, _l & 0xff, _l >> 8, _direction, _l, _b); \
}
/* execute firmware command */
static int hackrf_ctrl_msg(struct hackrf_dev *dev, u8 request, u16 value,
u16 index, u8 *data, u16 size)
{
int ret;
unsigned int pipe;
u8 requesttype;
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);
requesttype = (USB_TYPE_VENDOR | USB_DIR_OUT);
break;
case CMD_BOARD_ID_READ:
case CMD_VERSION_STRING_READ:
case CMD_SET_LNA_GAIN:
case CMD_SET_VGA_GAIN:
case CMD_SET_TXVGA_GAIN:
pipe = usb_rcvctrlpipe(dev->udev, 0);
requesttype = (USB_TYPE_VENDOR | USB_DIR_IN);
break;
default:
dev_err(dev->dev, "Unknown command %02x\n", request);
ret = -EINVAL;
goto err;
}
/* write request */
if (!(requesttype & USB_DIR_IN))
memcpy(dev->buf, data, size);
ret = usb_control_msg(dev->udev, pipe, request, requesttype, value,
index, dev->buf, size, 1000);
hackrf_dbg_usb_control_msg(dev->dev, request, requesttype, value,
index, dev->buf, size);
if (ret < 0) {
dev_err(dev->dev, "usb_control_msg() failed %d request %02x\n",
ret, request);
goto err;
}
/* read request */
if (requesttype & USB_DIR_IN)
memcpy(data, dev->buf, size);
return 0;
err:
return ret;
}
static int hackrf_set_params(struct hackrf_dev *dev)
{
struct usb_interface *intf = dev->intf;
int ret, i;
u8 buf[8], u8tmp;
unsigned int uitmp, uitmp1, uitmp2;
const bool rx = test_bit(RX_ON, &dev->flags);
const bool tx = test_bit(TX_ON, &dev->flags);
static const struct {
u32 freq;
} bandwidth_lut[] = {
{ 1750000}, /* 1.75 MHz */
{ 2500000}, /* 2.5 MHz */
{ 3500000}, /* 3.5 MHz */
{ 5000000}, /* 5 MHz */
{ 5500000}, /* 5.5 MHz */
{ 6000000}, /* 6 MHz */
{ 7000000}, /* 7 MHz */
{ 8000000}, /* 8 MHz */
{ 9000000}, /* 9 MHz */
{10000000}, /* 10 MHz */
{12000000}, /* 12 MHz */
{14000000}, /* 14 MHz */
{15000000}, /* 15 MHz */
{20000000}, /* 20 MHz */
{24000000}, /* 24 MHz */
{28000000}, /* 28 MHz */
};
if (!rx && !tx) {
dev_dbg(&intf->dev, "device is sleeping\n");
return 0;
}
/* ADC / DAC frequency */
if (rx && test_and_clear_bit(RX_ADC_FREQUENCY, &dev->flags)) {
dev_dbg(&intf->dev, "RX ADC frequency=%u Hz\n", dev->f_adc);
uitmp1 = dev->f_adc;
uitmp2 = 1;
set_bit(TX_DAC_FREQUENCY, &dev->flags);
} else if (tx && test_and_clear_bit(TX_DAC_FREQUENCY, &dev->flags)) {
dev_dbg(&intf->dev, "TX DAC frequency=%u Hz\n", dev->f_dac);
uitmp1 = dev->f_dac;
uitmp2 = 1;
set_bit(RX_ADC_FREQUENCY, &dev->flags);
} else {
uitmp1 = uitmp2 = 0;
}
if (uitmp1 || uitmp2) {
buf[0] = (uitmp1 >> 0) & 0xff;
buf[1] = (uitmp1 >> 8) & 0xff;
buf[2] = (uitmp1 >> 16) & 0xff;
buf[3] = (uitmp1 >> 24) & 0xff;
buf[4] = (uitmp2 >> 0) & 0xff;
buf[5] = (uitmp2 >> 8) & 0xff;
buf[6] = (uitmp2 >> 16) & 0xff;
buf[7] = (uitmp2 >> 24) & 0xff;
ret = hackrf_ctrl_msg(dev, CMD_SAMPLE_RATE_SET, 0, 0, buf, 8);
if (ret)
goto err;
}
/* bandwidth */
if (rx && test_and_clear_bit(RX_BANDWIDTH, &dev->flags)) {
if (dev->rx_bandwidth_auto->val == true)
uitmp = dev->f_adc;
else
uitmp = dev->rx_bandwidth->val;
for (i = 0; i < ARRAY_SIZE(bandwidth_lut); i++) {
if (uitmp <= bandwidth_lut[i].freq) {
uitmp = bandwidth_lut[i].freq;
break;
}
}
dev->rx_bandwidth->val = uitmp;
dev->rx_bandwidth->cur.val = uitmp;
dev_dbg(&intf->dev, "RX bandwidth selected=%u\n", uitmp);
set_bit(TX_BANDWIDTH, &dev->flags);
} else if (tx && test_and_clear_bit(TX_BANDWIDTH, &dev->flags)) {
if (dev->tx_bandwidth_auto->val == true)
uitmp = dev->f_dac;
else
uitmp = dev->tx_bandwidth->val;
for (i = 0; i < ARRAY_SIZE(bandwidth_lut); i++) {
if (uitmp <= bandwidth_lut[i].freq) {
uitmp = bandwidth_lut[i].freq;
break;
}
}
dev->tx_bandwidth->val = uitmp;
dev->tx_bandwidth->cur.val = uitmp;
dev_dbg(&intf->dev, "TX bandwidth selected=%u\n", uitmp);
set_bit(RX_BANDWIDTH, &dev->flags);
} else {
uitmp = 0;
}
if (uitmp) {
uitmp1 = uitmp2 = 0;
uitmp1 |= ((uitmp >> 0) & 0xff) << 0;
uitmp1 |= ((uitmp >> 8) & 0xff) << 8;
uitmp2 |= ((uitmp >> 16) & 0xff) << 0;
uitmp2 |= ((uitmp >> 24) & 0xff) << 8;
ret = hackrf_ctrl_msg(dev, CMD_BASEBAND_FILTER_BANDWIDTH_SET,
uitmp1, uitmp2, NULL, 0);
if (ret)
goto err;
}
/* RX / TX RF frequency */
if (rx && test_and_clear_bit(RX_RF_FREQUENCY, &dev->flags)) {
dev_dbg(&intf->dev, "RX RF frequency=%u Hz\n", dev->f_rx);
uitmp1 = dev->f_rx / 1000000;
uitmp2 = dev->f_rx % 1000000;
set_bit(TX_RF_FREQUENCY, &dev->flags);
} else if (tx && test_and_clear_bit(TX_RF_FREQUENCY, &dev->flags)) {
dev_dbg(&intf->dev, "TX RF frequency=%u Hz\n", dev->f_tx);
uitmp1 = dev->f_tx / 1000000;
uitmp2 = dev->f_tx % 1000000;
set_bit(RX_RF_FREQUENCY, &dev->flags);
} else {
uitmp1 = uitmp2 = 0;
}
if (uitmp1 || uitmp2) {
buf[0] = (uitmp1 >> 0) & 0xff;
buf[1] = (uitmp1 >> 8) & 0xff;
buf[2] = (uitmp1 >> 16) & 0xff;
buf[3] = (uitmp1 >> 24) & 0xff;
buf[4] = (uitmp2 >> 0) & 0xff;
buf[5] = (uitmp2 >> 8) & 0xff;
buf[6] = (uitmp2 >> 16) & 0xff;
buf[7] = (uitmp2 >> 24) & 0xff;
ret = hackrf_ctrl_msg(dev, CMD_SET_FREQ, 0, 0, buf, 8);
if (ret)
goto err;
}
/* RX RF gain */
if (rx && test_and_clear_bit(RX_RF_GAIN, &dev->flags)) {
dev_dbg(&intf->dev, "RX RF gain val=%d->%d\n",
dev->rx_rf_gain->cur.val, dev->rx_rf_gain->val);
u8tmp = (dev->rx_rf_gain->val) ? 1 : 0;
ret = hackrf_ctrl_msg(dev, CMD_AMP_ENABLE, u8tmp, 0, NULL, 0);
if (ret)
goto err;
set_bit(TX_RF_GAIN, &dev->flags);
}
/* TX RF gain */
if (tx && test_and_clear_bit(TX_RF_GAIN, &dev->flags)) {
dev_dbg(&intf->dev, "TX RF gain val=%d->%d\n",
dev->tx_rf_gain->cur.val, dev->tx_rf_gain->val);
u8tmp = (dev->tx_rf_gain->val) ? 1 : 0;
ret = hackrf_ctrl_msg(dev, CMD_AMP_ENABLE, u8tmp, 0, NULL, 0);
if (ret)
goto err;
set_bit(RX_RF_GAIN, &dev->flags);
}
/* RX LNA gain */
if (rx && test_and_clear_bit(RX_LNA_GAIN, &dev->flags)) {
dev_dbg(dev->dev, "RX LNA gain val=%d->%d\n",
dev->rx_lna_gain->cur.val, dev->rx_lna_gain->val);
ret = hackrf_ctrl_msg(dev, CMD_SET_LNA_GAIN, 0,
dev->rx_lna_gain->val, &u8tmp, 1);
if (ret)
goto err;
}
/* RX IF gain */
if (rx && test_and_clear_bit(RX_IF_GAIN, &dev->flags)) {
dev_dbg(&intf->dev, "IF gain val=%d->%d\n",
dev->rx_if_gain->cur.val, dev->rx_if_gain->val);
ret = hackrf_ctrl_msg(dev, CMD_SET_VGA_GAIN, 0,
dev->rx_if_gain->val, &u8tmp, 1);
if (ret)
goto err;
}
/* TX LNA gain */
if (tx && test_and_clear_bit(TX_LNA_GAIN, &dev->flags)) {
dev_dbg(&intf->dev, "TX LNA gain val=%d->%d\n",
dev->tx_lna_gain->cur.val, dev->tx_lna_gain->val);
ret = hackrf_ctrl_msg(dev, CMD_SET_TXVGA_GAIN, 0,
dev->tx_lna_gain->val, &u8tmp, 1);
if (ret)
goto err;
}
return 0;
err:
dev_dbg(&intf->dev, "failed=%d\n", ret);
return ret;
}
/* Private functions */
static struct hackrf_buffer *hackrf_get_next_buffer(struct hackrf_dev *dev,
struct list_head *buffer_list)
{
unsigned long flags;
struct hackrf_buffer *buffer = NULL;
spin_lock_irqsave(&dev->buffer_list_lock, flags);
if (list_empty(buffer_list))
goto leave;
buffer = list_entry(buffer_list->next, struct hackrf_buffer, list);
list_del(&buffer->list);
leave:
spin_unlock_irqrestore(&dev->buffer_list_lock, flags);
return buffer;
}
static void hackrf_copy_stream(struct hackrf_dev *dev, void *dst, void *src,
unsigned int src_len)
{
memcpy(dst, src, src_len);
/* calculate sample rate and output it in 10 seconds intervals */
if (unlikely(time_is_before_jiffies(dev->jiffies_next))) {
#define MSECS 10000UL
unsigned int msecs = jiffies_to_msecs(jiffies -
dev->jiffies_next + msecs_to_jiffies(MSECS));
unsigned int samples = dev->sample - dev->sample_measured;
dev->jiffies_next = jiffies + msecs_to_jiffies(MSECS);
dev->sample_measured = dev->sample;
dev_dbg(dev->dev, "slen=%u samples=%u msecs=%u sample rate=%lu\n",
src_len, samples, msecs,
samples * 1000UL / msecs);
}
/* total number of samples */
dev->sample += src_len / 2;
}
/*
* This gets called for the bulk stream pipe. This is done in interrupt
* time, so it has to be fast, not crash, and not stall. Neat.
*/
static void hackrf_urb_complete_in(struct urb *urb)
{
struct hackrf_dev *dev = urb->context;
struct usb_interface *intf = dev->intf;
struct hackrf_buffer *buffer;
unsigned int len;
dev_dbg_ratelimited(&intf->dev, "status=%d length=%u/%u\n", urb->status,
urb->actual_length, urb->transfer_buffer_length);
switch (urb->status) {
case 0: /* success */
case -ETIMEDOUT: /* NAK */
break;
case -ECONNRESET: /* kill */
case -ENOENT:
case -ESHUTDOWN:
return;
default: /* error */
dev_err_ratelimited(&intf->dev, "URB failed %d\n", urb->status);
goto exit_usb_submit_urb;
}
/* get buffer to write */
buffer = hackrf_get_next_buffer(dev, &dev->rx_buffer_list);
if (unlikely(buffer == NULL)) {
dev->vb_full++;
dev_notice_ratelimited(&intf->dev,
"buffer is full - %u packets dropped\n",
dev->vb_full);
goto exit_usb_submit_urb;
}
len = min_t(unsigned long, vb2_plane_size(&buffer->vb.vb2_buf, 0),
urb->actual_length);
hackrf_copy_stream(dev, vb2_plane_vaddr(&buffer->vb.vb2_buf, 0),
urb->transfer_buffer, len);
vb2_set_plane_payload(&buffer->vb.vb2_buf, 0, len);
buffer->vb.sequence = dev->sequence++;
buffer->vb.vb2_buf.timestamp = ktime_get_ns();
vb2_buffer_done(&buffer->vb.vb2_buf, VB2_BUF_STATE_DONE);
exit_usb_submit_urb:
usb_submit_urb(urb, GFP_ATOMIC);
}
static void hackrf_urb_complete_out(struct urb *urb)
{
struct hackrf_dev *dev = urb->context;
struct usb_interface *intf = dev->intf;
struct hackrf_buffer *buffer;
unsigned int len;
dev_dbg_ratelimited(&intf->dev, "status=%d length=%u/%u\n", urb->status,
urb->actual_length, urb->transfer_buffer_length);
switch (urb->status) {
case 0: /* success */
case -ETIMEDOUT: /* NAK */
break;
case -ECONNRESET: /* kill */
case -ENOENT:
case -ESHUTDOWN:
return;
default: /* error */
dev_err_ratelimited(&intf->dev, "URB failed %d\n", urb->status);
}
/* get buffer to read */
buffer = hackrf_get_next_buffer(dev, &dev->tx_buffer_list);
if (unlikely(buffer == NULL)) {
dev->vb_empty++;
dev_notice_ratelimited(&intf->dev,
"buffer is empty - %u packets dropped\n",
dev->vb_empty);
urb->actual_length = 0;
goto exit_usb_submit_urb;
}
len = min_t(unsigned long, urb->transfer_buffer_length,
vb2_get_plane_payload(&buffer->vb.vb2_buf, 0));
hackrf_copy_stream(dev, urb->transfer_buffer,
vb2_plane_vaddr(&buffer->vb.vb2_buf, 0), len);
urb->actual_length = len;
buffer->vb.sequence = dev->sequence++;
buffer->vb.vb2_buf.timestamp = ktime_get_ns();
vb2_buffer_done(&buffer->vb.vb2_buf, VB2_BUF_STATE_DONE);
exit_usb_submit_urb:
usb_submit_urb(urb, GFP_ATOMIC);
}
static int hackrf_kill_urbs(struct hackrf_dev *dev)
{
int i;
for (i = dev->urbs_submitted - 1; i >= 0; i--) {
dev_dbg(dev->dev, "kill urb=%d\n", i);
/* stop the URB */
usb_kill_urb(dev->urb_list[i]);
}
dev->urbs_submitted = 0;
return 0;
}
static int hackrf_submit_urbs(struct hackrf_dev *dev)
{
int i, ret;
for (i = 0; i < dev->urbs_initialized; i++) {
dev_dbg(dev->dev, "submit urb=%d\n", i);
ret = usb_submit_urb(dev->urb_list[i], GFP_KERNEL);
if (ret) {
dev_err(dev->dev, "Could not submit URB no. %d - get them all back\n",
i);
hackrf_kill_urbs(dev);
return ret;
}
dev->urbs_submitted++;
}
return 0;
}
static int hackrf_free_stream_bufs(struct hackrf_dev *dev)
{
if (dev->flags & USB_STATE_URB_BUF) {
while (dev->buf_num) {
dev->buf_num--;
dev_dbg(dev->dev, "free buf=%d\n", dev->buf_num);
usb_free_coherent(dev->udev, dev->buf_size,
dev->buf_list[dev->buf_num],
dev->dma_addr[dev->buf_num]);
}
}
dev->flags &= ~USB_STATE_URB_BUF;
return 0;
}
static int hackrf_alloc_stream_bufs(struct hackrf_dev *dev)
{
dev->buf_num = 0;
dev->buf_size = BULK_BUFFER_SIZE;
dev_dbg(dev->dev, "all in all I will use %u bytes for streaming\n",
MAX_BULK_BUFS * BULK_BUFFER_SIZE);
for (dev->buf_num = 0; dev->buf_num < MAX_BULK_BUFS; dev->buf_num++) {
dev->buf_list[dev->buf_num] = usb_alloc_coherent(dev->udev,
BULK_BUFFER_SIZE, GFP_KERNEL,
&dev->dma_addr[dev->buf_num]);
if (!dev->buf_list[dev->buf_num]) {
dev_dbg(dev->dev, "alloc buf=%d failed\n",
dev->buf_num);
hackrf_free_stream_bufs(dev);
return -ENOMEM;
}
dev_dbg(dev->dev, "alloc buf=%d %p (dma %llu)\n", dev->buf_num,
dev->buf_list[dev->buf_num],
(long long)dev->dma_addr[dev->buf_num]);
dev->flags |= USB_STATE_URB_BUF;
}
return 0;
}
static int hackrf_free_urbs(struct hackrf_dev *dev)
{
int i;
hackrf_kill_urbs(dev);
for (i = dev->urbs_initialized - 1; i >= 0; i--) {
if (dev->urb_list[i]) {
dev_dbg(dev->dev, "free urb=%d\n", i);
/* free the URBs */
usb_free_urb(dev->urb_list[i]);
}
}
dev->urbs_initialized = 0;
return 0;
}
static int hackrf_alloc_urbs(struct hackrf_dev *dev, bool rcv)
{
int i, j;
unsigned int pipe;
usb_complete_t complete;
if (rcv) {
pipe = usb_rcvbulkpipe(dev->udev, 0x81);
complete = &hackrf_urb_complete_in;
} else {
pipe = usb_sndbulkpipe(dev->udev, 0x02);
complete = &hackrf_urb_complete_out;
}
/* allocate the URBs */
for (i = 0; i < MAX_BULK_BUFS; i++) {
dev_dbg(dev->dev, "alloc urb=%d\n", i);
dev->urb_list[i] = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->urb_list[i]) {
for (j = 0; j < i; j++)
usb_free_urb(dev->urb_list[j]);
return -ENOMEM;
}
usb_fill_bulk_urb(dev->urb_list[i],
dev->udev,
pipe,
dev->buf_list[i],
BULK_BUFFER_SIZE,
complete, dev);
dev->urb_list[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
dev->urb_list[i]->transfer_dma = dev->dma_addr[i];
dev->urbs_initialized++;
}
return 0;
}
/* The user yanked out the cable... */
static void hackrf_disconnect(struct usb_interface *intf)
{
struct v4l2_device *v = usb_get_intfdata(intf);
struct hackrf_dev *dev = container_of(v, struct hackrf_dev, v4l2_dev);
dev_dbg(dev->dev, "\n");
mutex_lock(&dev->vb_queue_lock);
mutex_lock(&dev->v4l2_lock);
/* No need to keep the urbs around after disconnection */
dev->udev = NULL;
v4l2_device_disconnect(&dev->v4l2_dev);
video_unregister_device(&dev->tx_vdev);
video_unregister_device(&dev->rx_vdev);
mutex_unlock(&dev->v4l2_lock);
mutex_unlock(&dev->vb_queue_lock);
v4l2_device_put(&dev->v4l2_dev);
}
/* Videobuf2 operations */
static void hackrf_return_all_buffers(struct vb2_queue *vq,
enum vb2_buffer_state state)
{
struct hackrf_dev *dev = vb2_get_drv_priv(vq);
struct usb_interface *intf = dev->intf;
struct hackrf_buffer *buffer, *node;
struct list_head *buffer_list;
unsigned long flags;
dev_dbg(&intf->dev, "\n");
if (vq->type == V4L2_BUF_TYPE_SDR_CAPTURE)
buffer_list = &dev->rx_buffer_list;
else
buffer_list = &dev->tx_buffer_list;
spin_lock_irqsave(&dev->buffer_list_lock, flags);
list_for_each_entry_safe(buffer, node, buffer_list, list) {
dev_dbg(&intf->dev, "list_for_each_entry_safe\n");
vb2_buffer_done(&buffer->vb.vb2_buf, state);
list_del(&buffer->list);
}
spin_unlock_irqrestore(&dev->buffer_list_lock, flags);
}
static int hackrf_queue_setup(struct vb2_queue *vq,
unsigned int *nbuffers,
unsigned int *nplanes, unsigned int sizes[], struct device *alloc_devs[])
{
struct hackrf_dev *dev = vb2_get_drv_priv(vq);
dev_dbg(dev->dev, "nbuffers=%d\n", *nbuffers);
/* Need at least 8 buffers */
if (vq->num_buffers + *nbuffers < 8)
*nbuffers = 8 - vq->num_buffers;
*nplanes = 1;
sizes[0] = PAGE_ALIGN(dev->buffersize);
dev_dbg(dev->dev, "nbuffers=%d sizes[0]=%d\n", *nbuffers, sizes[0]);
return 0;
}
static void hackrf_buf_queue(struct vb2_buffer *vb)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct vb2_queue *vq = vb->vb2_queue;
struct hackrf_dev *dev = vb2_get_drv_priv(vq);
struct hackrf_buffer *buffer = container_of(vbuf, struct hackrf_buffer, vb);
struct list_head *buffer_list;
unsigned long flags;
dev_dbg_ratelimited(&dev->intf->dev, "\n");
if (vq->type == V4L2_BUF_TYPE_SDR_CAPTURE)
buffer_list = &dev->rx_buffer_list;
else
buffer_list = &dev->tx_buffer_list;
spin_lock_irqsave(&dev->buffer_list_lock, flags);
list_add_tail(&buffer->list, buffer_list);
spin_unlock_irqrestore(&dev->buffer_list_lock, flags);
}
static int hackrf_start_streaming(struct vb2_queue *vq, unsigned int count)
{
struct hackrf_dev *dev = vb2_get_drv_priv(vq);
struct usb_interface *intf = dev->intf;
int ret;
unsigned int mode;
dev_dbg(&intf->dev, "count=%i\n", count);
mutex_lock(&dev->v4l2_lock);
/* Allow only RX or TX, not both same time */
if (vq->type == V4L2_BUF_TYPE_SDR_CAPTURE) {
if (test_bit(TX_ON, &dev->flags)) {
ret = -EBUSY;
goto err_hackrf_return_all_buffers;
}
mode = 1;
set_bit(RX_ON, &dev->flags);
} else {
if (test_bit(RX_ON, &dev->flags)) {
ret = -EBUSY;
goto err_hackrf_return_all_buffers;
}
mode = 2;
set_bit(TX_ON, &dev->flags);
}
dev->sequence = 0;
ret = hackrf_alloc_stream_bufs(dev);
if (ret)
goto err;
ret = hackrf_alloc_urbs(dev, (mode == 1));
if (ret)
goto err;
ret = hackrf_submit_urbs(dev);
if (ret)
goto err;
ret = hackrf_set_params(dev);
if (ret)
goto err;
/* start hardware streaming */
ret = hackrf_ctrl_msg(dev, CMD_SET_TRANSCEIVER_MODE, mode, 0, NULL, 0);
if (ret)
goto err;
mutex_unlock(&dev->v4l2_lock);
return 0;
err:
hackrf_kill_urbs(dev);
hackrf_free_urbs(dev);
hackrf_free_stream_bufs(dev);
clear_bit(RX_ON, &dev->flags);
clear_bit(TX_ON, &dev->flags);
err_hackrf_return_all_buffers:
hackrf_return_all_buffers(vq, VB2_BUF_STATE_QUEUED);
mutex_unlock(&dev->v4l2_lock);
dev_dbg(&intf->dev, "failed=%d\n", ret);
return ret;
}
static void hackrf_stop_streaming(struct vb2_queue *vq)
{
struct hackrf_dev *dev = vb2_get_drv_priv(vq);
struct usb_interface *intf = dev->intf;
dev_dbg(&intf->dev, "\n");
mutex_lock(&dev->v4l2_lock);
/* stop hardware streaming */
hackrf_ctrl_msg(dev, CMD_SET_TRANSCEIVER_MODE, 0, 0, NULL, 0);
hackrf_kill_urbs(dev);
hackrf_free_urbs(dev);
hackrf_free_stream_bufs(dev);
hackrf_return_all_buffers(vq, VB2_BUF_STATE_ERROR);
if (vq->type == V4L2_BUF_TYPE_SDR_CAPTURE)
clear_bit(RX_ON, &dev->flags);
else
clear_bit(TX_ON, &dev->flags);
mutex_unlock(&dev->v4l2_lock);
}
static const struct vb2_ops hackrf_vb2_ops = {
.queue_setup = hackrf_queue_setup,
.buf_queue = hackrf_buf_queue,
.start_streaming = hackrf_start_streaming,
.stop_streaming = hackrf_stop_streaming,
.wait_prepare = vb2_ops_wait_prepare,
.wait_finish = vb2_ops_wait_finish,
};
static int hackrf_querycap(struct file *file, void *fh,
struct v4l2_capability *cap)
{
struct hackrf_dev *dev = video_drvdata(file);
struct usb_interface *intf = dev->intf;
dev_dbg(&intf->dev, "\n");
cap->capabilities = V4L2_CAP_SDR_CAPTURE | V4L2_CAP_TUNER |
V4L2_CAP_SDR_OUTPUT | V4L2_CAP_MODULATOR |
V4L2_CAP_STREAMING | V4L2_CAP_READWRITE |
V4L2_CAP_DEVICE_CAPS;
strscpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
strscpy(cap->card, dev->rx_vdev.name, sizeof(cap->card));
usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
return 0;
}
static int hackrf_s_fmt_sdr(struct file *file, void *priv,
struct v4l2_format *f)
{
struct hackrf_dev *dev = video_drvdata(file);
struct video_device *vdev = video_devdata(file);
struct vb2_queue *q;
int i;
dev_dbg(dev->dev, "pixelformat fourcc %4.4s\n",
(char *)&f->fmt.sdr.pixelformat);
if (vdev->vfl_dir == VFL_DIR_RX)
q = &dev->rx_vb2_queue;
else
q = &dev->tx_vb2_queue;
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 (f->fmt.sdr.pixelformat == formats[i].pixelformat) {
dev->pixelformat = formats[i].pixelformat;
dev->buffersize = formats[i].buffersize;
f->fmt.sdr.buffersize = formats[i].buffersize;
return 0;
}
}
dev->pixelformat = formats[0].pixelformat;
dev->buffersize = formats[0].buffersize;
f->fmt.sdr.pixelformat = formats[0].pixelformat;
f->fmt.sdr.buffersize = formats[0].buffersize;
return 0;
}
static int hackrf_g_fmt_sdr(struct file *file, void *priv,
struct v4l2_format *f)
{
struct hackrf_dev *dev = video_drvdata(file);
dev_dbg(dev->dev, "pixelformat fourcc %4.4s\n",
(char *)&dev->pixelformat);
memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
f->fmt.sdr.pixelformat = dev->pixelformat;
f->fmt.sdr.buffersize = dev->buffersize;
return 0;
}
static int hackrf_try_fmt_sdr(struct file *file, void *priv,
struct v4l2_format *f)
{
struct hackrf_dev *dev = video_drvdata(file);
int i;
dev_dbg(dev->dev, "pixelformat fourcc %4.4s\n",
(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) {
f->fmt.sdr.buffersize = formats[i].buffersize;
return 0;
}
}
f->fmt.sdr.pixelformat = formats[0].pixelformat;
f->fmt.sdr.buffersize = formats[0].buffersize;
return 0;
}
static int hackrf_enum_fmt_sdr(struct file *file, void *priv,
struct v4l2_fmtdesc *f)
{
struct hackrf_dev *dev = video_drvdata(file);
dev_dbg(dev->dev, "index=%d\n", f->index);
if (f->index >= NUM_FORMATS)
return -EINVAL;
f->pixelformat = formats[f->index].pixelformat;
return 0;