static s32 usart1_read_length(u8* buff, u32 want_len)
{
u8 BoxErr = 0; //邮箱接收错误标志
s32 len = 0;
#if SYS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
SYS_CPU_SR cpu_sr = 0;
#endif
SYS_ENTER_CRITICAL();
len = kfifo_len(&rx_fifo);
if(len >= want_len)
{
len = kfifo_get(&rx_fifo,buff,want_len);
SYS_EXIT_CRITICAL();
return len;
}
rx_length = want_len;
SYS_EXIT_CRITICAL();
SysMboxPend(rx_event, rx_timeout_ticks, &BoxErr); //邮箱接收挂起
if(BoxErr != 0)
{
return 0;
}
SYS_ENTER_CRITICAL();
len = kfifo_get(&rx_fifo,buff,want_len);
SYS_EXIT_CRITICAL();
return len;
}
static void stp_uart_rx_handling(unsigned long func_data){
unsigned int how_much_get = 0;
unsigned int how_much_to_get = 0;
unsigned int flag = 0;
// read_lock(&g_stp_uart_rx_handling_lock);
how_much_to_get = kfifo_len(g_stp_uart_rx_fifo);
if (how_much_to_get >= RX_BUFFER_LEN)
{
flag = 1;
UART_INFO_FUNC ("fifolen(%d)\n", how_much_to_get);
}
do{
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35))
how_much_get= kfifo_get(g_stp_uart_rx_fifo, g_rx_data, RX_BUFFER_LEN);
#else
how_much_get= kfifo_out(g_stp_uart_rx_fifo, g_rx_data, RX_BUFFER_LEN);
#endif
//UART_INFO_FUNC ("fifoget(%d)\n", how_much_get);
mtk_wcn_stp_parser_data((UINT8 *)g_rx_data, how_much_get);
how_much_to_get = kfifo_len(g_stp_uart_rx_fifo);
}while(how_much_to_get > 0);
// read_unlock(&g_stp_uart_rx_handling_lock);
if (1 == flag)
{
UART_INFO_FUNC ("finish, fifolen(%d)\n", kfifo_len(g_stp_uart_rx_fifo));
}
}
static void omap_plane_post_apply(struct omap_drm_apply *apply)
{
struct omap_plane *omap_plane =
container_of(apply, struct omap_plane, apply);
struct drm_plane *plane = &omap_plane->base;
struct omap_overlay_info *info = &omap_plane->info;
struct drm_gem_object *bo = NULL;
struct callback cb;
cb = omap_plane->apply_done_cb;
omap_plane->apply_done_cb.fxn = NULL;
while (kfifo_get(&omap_plane->unpin_fifo, &bo)) {
omap_gem_put_paddr(bo);
drm_gem_object_unreference_unlocked(bo);
}
if (cb.fxn)
cb.fxn(cb.arg);
if (omap_plane->enabled) {
omap_framebuffer_flush(plane->fb, info->pos_x, info->pos_y,
info->out_width, info->out_height);
}
}
static int tftp_write(struct device_d *_dev, FILE *f, const void *inbuf,
size_t insize)
{
struct file_priv *priv = f->inode;
size_t size, now;
int ret;
debug("%s: %zu\n", __func__, insize);
size = insize;
while (size) {
now = kfifo_put(priv->fifo, inbuf, size);
while (kfifo_len(priv->fifo) >= priv->blocksize) {
kfifo_get(priv->fifo, priv->buf, priv->blocksize);
tftp_send_write(priv, priv->buf, priv->blocksize);
tftp_timer_reset(priv);
while (priv->state == STATE_WAITACK) {
ret = tftp_poll(priv);
if (ret == TFTP_ERR_RESEND)
tftp_send_write(priv, priv->buf,
priv->blocksize);
if (ret < 0)
return ret;
}
}
size -= now;
inbuf += now;
}
return insize;
}
static int __init testfunc(void)
{
unsigned char buf[6];
unsigned char i, j;
unsigned int ret;
printk(KERN_INFO "[fifo]byte stream fifo test start\n");
/* put string into the fifo */
kfifo_in(&test, "hello", 5);
/* put values into the fifo */
for (i = 0; i != 10; i++)
kfifo_put(&test, &i);
/* show the number of used elements */
printk(KERN_INFO "[fifo]fifo len: %u\n", kfifo_len(&test));
/* get max of 5 bytes from the fifo */
i = kfifo_out(&test, buf, 5);
printk(KERN_INFO "[fifo]buf: %.*s\n", i, buf);
/* get max of 2 elements from the fifo */
ret = kfifo_out(&test, buf, 2);
printk(KERN_INFO "[fifo]ret: %d\n", ret);
/* and put it back to the end of the fifo */
ret = kfifo_in(&test, buf, ret);
printk(KERN_INFO "[fifo]ret: %d\n", ret);
/* skip first element of the fifo */
printk(KERN_INFO "[fifo]skip 1st element\n");
kfifo_skip(&test);
/* put values into the fifo until is full */
for (i = 20; kfifo_put(&test, &i); i++)
;
printk(KERN_INFO "[fifo]queue len: %u\n", kfifo_len(&test));
/* show the first value without removing from the fifo */
if (kfifo_peek(&test, &i))
printk(KERN_INFO "[fifo]%d\n", i);
/* check the correctness of all values in the fifo */
j = 0;
while (kfifo_get(&test, &i)) {
printk(KERN_INFO "item = %d\n", i);
if (i != expected_result[j++]) {
printk(KERN_WARNING "value mismatch: test failed\n");
return -EIO;
}
}
if (j != ARRAY_SIZE(expected_result)) {
printk(KERN_WARNING "size mismatch: test failed\n");
return -EIO;
}
printk(KERN_INFO "[fifo]test passed\n");
return 0;
}
static int tftp_read(struct device_d *dev, FILE *f, void *buf, size_t insize)
{
struct file_priv *priv = f->inode;
size_t outsize = 0, now;
int ret;
debug("%s %zu\n", __func__, insize);
while (insize) {
now = kfifo_get(priv->fifo, buf, insize);
if (priv->state == STATE_DONE)
return outsize + now;
if (now) {
outsize += now;
buf += now;
insize -= now;
}
if (TFTP_FIFO_SIZE - kfifo_len(priv->fifo) >= priv->blocksize)
tftp_send(priv);
ret = tftp_poll(priv);
if (ret == TFTP_ERR_RESEND)
tftp_send(priv);
if (ret < 0)
return ret;
}
return outsize;
}
static ssize_t threadrw_write_onece(
struct threadrw_write_task *task,
struct file *file,
struct stream_buf_s *stbuf,
const char __user *buf, size_t count)
{
struct threadrw_buf *rwbuf = NULL;
int ret = 0;
int to_write;
if (!kfifo_get(&task->freefifo, (void *)&rwbuf)) {
if (task->errors)
return task->errors;
return -EAGAIN;
}
to_write = min_t(u32, rwbuf->buffer_size, count);
if (copy_from_user(rwbuf->vbuffer, buf, to_write)) {
kfifo_put(&task->freefifo, (const void *)buf);
ret = -EFAULT;
goto err;
}
rwbuf->data_size = to_write;
rwbuf->write_off = 0;
kfifo_put(&task->datafifo, (const void *)rwbuf);
threadrw_schedule_delayed_work(task, 0);
return to_write;
err:
return ret;
}
static int nfs_read(struct device_d *dev, FILE *file, void *buf, size_t insize)
{
struct file_priv *priv = file->inode;
int now, outsize = 0, ret, pos = file->pos;
while (insize) {
now = kfifo_get(priv->fifo, buf, insize);
outsize += now;
buf += now;
insize -= now;
if (insize) {
/* do not use min as insize is a size_t */
if (insize < 1024)
now = insize;
else
now = 1024;
if (pos + now > file->size)
now = file->size - pos;
ret = nfs_read_req(priv, pos, now);
if (ret)
return ret;
pos += now;
}
}
return outsize;
}
static ssize_t tcpprobe_read(struct file *file, char __user *buf,
size_t len, loff_t *ppos)
{
int error = 0, cnt = 0;
unsigned char *tbuf;
if (!buf || len < 0)
return -EINVAL;
if (len == 0)
return 0;
tbuf = vmalloc(len);
if (!tbuf)
return -ENOMEM;
error = wait_event_interruptible(tcpw.wait,
__kfifo_len(tcpw.fifo) != 0);
if (error)
goto out_free;
cnt = kfifo_get(tcpw.fifo, tbuf, len);
error = copy_to_user(buf, tbuf, cnt);
out_free:
vfree(tbuf);
return error ? error : cnt;
}
void mt76x2_mac_process_tx_status_fifo(struct mt76x2_dev *dev)
{
struct mt76x2_tx_status stat;
u8 update = 1;
while (kfifo_get(&dev->txstatus_fifo, &stat))
mt76x2_send_tx_status(dev, &stat, &update);
}
static int gpio_keys_getc(struct console_device *cdev)
{
int code = 0;
struct gpio_keys_platform_data *pdata = cdev_to_gk_pdata(cdev);
kfifo_get(pdata->recv_fifo, (u_char*)&code, sizeof(int));
return code;
}
/*
* Interrupt functions.
*/
static void rt2800pci_wakeup(struct rt2x00_dev *rt2x00dev)
{
struct ieee80211_conf conf = { .flags = 0 };
struct rt2x00lib_conf libconf = { .conf = &conf };
rt2800_config(rt2x00dev, &libconf, IEEE80211_CONF_CHANGE_PS);
}
static void rt2800pci_txdone(struct rt2x00_dev *rt2x00dev)
{
struct data_queue *queue;
struct queue_entry *entry;
u32 status;
u8 qid;
while (kfifo_get(&rt2x00dev->txstatus_fifo, &status)) {
qid = rt2x00_get_field32(status, TX_STA_FIFO_PID_QUEUE);
if (qid >= QID_RX) {
/*
* Unknown queue, this shouldn't happen. Just drop
* this tx status.
*/
WARNING(rt2x00dev, "Got TX status report with "
"unexpected pid %u, dropping\n", qid);
break;
}
queue = rt2x00queue_get_queue(rt2x00dev, qid);
if (unlikely(queue == NULL)) {
/*
* The queue is NULL, this shouldn't happen. Stop
* processing here and drop the tx status
*/
WARNING(rt2x00dev, "Got TX status for an unavailable "
"queue %u, dropping\n", qid);
break;
}
if (rt2x00queue_empty(queue)) {
/*
* The queue is empty. Stop processing here
* and drop the tx status.
*/
WARNING(rt2x00dev, "Got TX status for an empty "
"queue %u, dropping\n", qid);
break;
}
entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
rt2800_txdone_entry(entry, status);
}
}
static void rt2800pci_txstatus_tasklet(unsigned long data)
{
rt2800pci_txdone((struct rt2x00_dev *)data);
}
static void armada_drm_unref_work(struct work_struct *work)
{
struct armada_private *priv =
container_of(work, struct armada_private, fb_unref_work);
struct drm_framebuffer *fb;
while (kfifo_get(&priv->fb_unref, &fb))
drm_framebuffer_unreference(fb);
}
/* Receiver */
static int cx25840_ir_rx_read(struct v4l2_subdev *sd, u8 *buf, size_t count,
ssize_t *num)
{
struct cx25840_ir_state *ir_state = to_ir_state(sd);
bool invert;
u16 divider;
unsigned int i, n;
union cx25840_ir_fifo_rec *p;
unsigned u, v;
if (ir_state == NULL)
return -ENODEV;
invert = (bool) atomic_read(&ir_state->rx_invert);
divider = (u16) atomic_read(&ir_state->rxclk_divider);
n = count / sizeof(union cx25840_ir_fifo_rec)
* sizeof(union cx25840_ir_fifo_rec);
if (n == 0) {
*num = 0;
return 0;
}
n = kfifo_get(ir_state->rx_kfifo, buf, n);
n /= sizeof(union cx25840_ir_fifo_rec);
*num = n * sizeof(union cx25840_ir_fifo_rec);
for (p = (union cx25840_ir_fifo_rec *) buf, i = 0; i < n; p++, i++) {
if ((p->hw_fifo_data & FIFO_RXTX_RTO) == FIFO_RXTX_RTO) {
/* Assume RTO was because of no IR light input */
u = 0;
v4l2_dbg(2, ir_debug, sd, "rx read: end of rx\n");
} else {
u = (p->hw_fifo_data & FIFO_RXTX_LVL) ? 1 : 0;
if (invert)
u = u ? 0 : 1;
}
v = (unsigned) pulse_width_count_to_ns(
(u16) (p->hw_fifo_data & FIFO_RXTX), divider);
if (v > IR_MAX_DURATION)
v = IR_MAX_DURATION;
init_ir_raw_event(&p->ir_core_data);
p->ir_core_data.pulse = u;
p->ir_core_data.duration = v;
v4l2_dbg(2, ir_debug, sd, "rx read: %10u ns %s\n",
v, u ? "mark" : "space");
}
return 0;
}
static int do_write_work_in(struct threadrw_write_task *task)
{
struct threadrw_buf *rwbuf = NULL;
int ret;
int need_re_write = 0;
int write_len = 0;
unsigned long flags;
if (kfifo_is_empty(&task->datafifo))
return 0;
if (!kfifo_peek(&task->datafifo, (void *)&rwbuf))
return 0;
if (task->codec_mm_buffer && !rwbuf->write_off)
codec_mm_dma_flush(rwbuf->vbuffer,
rwbuf->data_size,
DMA_TO_DEVICE);
ret = task->write(task->file, task->sbuf,
(const char __user *)rwbuf->dma_handle + rwbuf->write_off,
rwbuf->data_size,
3); /* noblock,phy addr */
if (ret == -EAGAIN) {
need_re_write = 0;
/*do later retry. */
} else if (ret >= rwbuf->data_size) {
write_len += rwbuf->data_size;
if (kfifo_get(&task->datafifo, (void *)&rwbuf)) {
rwbuf->data_size = 0;
kfifo_put(&task->freefifo, (const void *)rwbuf);
/*wakeup write thread. */
wake_up_interruptible(&task->wq);
} else
pr_err("write ok,but kfifo_get data failed.!!!\n");
need_re_write = 1;
} else if (ret > 0) {
rwbuf->data_size -= ret; /* half data write */
rwbuf->write_off += ret;
write_len += ret;
need_re_write = 1;
} else { /*ret <=0 */
pr_err("get errors ret=%d size=%d\n", ret,
rwbuf->data_size);
task->errors = ret;
}
if (write_len > 0) {
task->passed_data_len += write_len;
spin_lock_irqsave(&task->lock, flags);
task->buffered_data_size -= write_len;
spin_unlock_irqrestore(&task->lock, flags);
}
return need_re_write;
}
static void flip_worker(struct work_struct *w)
{
struct drm_flip_work *work = container_of(w, struct drm_flip_work, worker);
uint32_t count = atomic_read(&work->count);
void *val = NULL;
atomic_sub(count, &work->count);
while(count--)
if (!WARN_ON(!kfifo_get(&work->fifo, &val)))
work->func(work, val);
}
static s32 usart1_read_keychar(u8* buff, u32 buff_len)
{
u8 BoxErr = 0; //邮箱接收错误标志
SysMboxPend(rx_event, rx_timeout_ticks, &BoxErr); //邮箱接收挂起
if(BoxErr != 0)
{
return 0;
}
return kfifo_get(&rx_fifo,buff,buff_len);
}
static int __init testfunc(void)
{
int buf[6];
int i, j;
unsigned int ret;
printk(KERN_INFO "int fifo test start\n");
for (i = 0; i != 10; i++)
kfifo_put(&test, &i);
printk(KERN_INFO "fifo len: %u\n", kfifo_len(&test));
ret = kfifo_out(&test, buf, 2);
printk(KERN_INFO "ret: %d\n", ret);
ret = kfifo_in(&test, buf, ret);
printk(KERN_INFO "ret: %d\n", ret);
printk(KERN_INFO "skip 1st element\n");
kfifo_skip(&test);
for (i = 20; kfifo_put(&test, &i); i++)
;
printk(KERN_INFO "queue len: %u\n", kfifo_len(&test));
if (kfifo_peek(&test, &i))
printk(KERN_INFO "%d\n", i);
j = 0;
while (kfifo_get(&test, &i)) {
printk(KERN_INFO "item = %d\n", i);
if (i != expected_result[j++]) {
printk(KERN_WARNING "value mismatch: test failed\n");
return -EIO;
}
}
if (j != ARRAY_SIZE(expected_result)) {
printk(KERN_WARNING "size mismatch: test failed\n");
return -EIO;
}
printk(KERN_INFO "test passed\n");
return 0;
}
struct iu_entry *srp_iu_get(struct srp_target *target)
{
struct iu_entry *iue = NULL;
kfifo_get(target->iu_queue.queue, (void *) &iue, sizeof(void *));
if (!iue)
return iue;
iue->target = target;
INIT_LIST_HEAD(&iue->ilist);
iue->flags = 0;
return iue;
}
static int __init fifo_init(void)
{
int i, val, ret;
ret = kfifo_alloc(&fifo, size * sizeof(int), GFP_KERNEL);
if (ret)
return -ENOMEM;
printk("%s: populating fifo\n", MODNAME);
for (i = 0; i < size; i++)
kfifo_put(&fifo, i + 1);
#if 0
printk("%s: iterating over fifo\n", MODNAME);
print_fifo(&fifo);
#endif
/* dequeue one item -- and discard it */
if (!kfifo_get(&fifo, &val))
/* use the result and silence the compiler */;
/* enqueue one more item */
kfifo_put(&fifo, size + 1);
#if 0
printk("%s: iterating over updated fifo\n", MODNAME);
print_fifo(&fifo);
#endif
printk("printing -- draining the queue\n");
i = 1;
while(kfifo_get(&fifo, &val)) {
printk("item[%d] = %d\n", i++, val);
}
printk("%s: init complete\n", MODNAME);
return 0;
}
/**
* usb_serial_generic_write_start - kick off an URB write
* @port: Pointer to the &struct usb_serial_port data
*
* Returns the number of bytes queued on success. This will be zero if there
* was nothing to send. Otherwise, it returns a negative errno value
*/
static int usb_serial_generic_write_start(struct usb_serial_port *port)
{
struct usb_serial *serial = port->serial;
unsigned char *data;
int result;
int count;
unsigned long flags;
bool start_io;
/* Atomically determine whether we can and need to start a USB
* operation. */
spin_lock_irqsave(&port->lock, flags);
if (port->write_urb_busy)
start_io = false;
else {
start_io = (__kfifo_len(port->write_fifo) != 0);
port->write_urb_busy = start_io;
}
spin_unlock_irqrestore(&port->lock, flags);
if (!start_io)
return 0;
data = port->write_urb->transfer_buffer;
count = kfifo_get(port->write_fifo, data, port->bulk_out_size);
usb_serial_debug_data(debug, &port->dev, __func__, count, data);
/* set up our urb */
usb_fill_bulk_urb(port->write_urb, serial->dev,
usb_sndbulkpipe(serial->dev,
port->bulk_out_endpointAddress),
port->write_urb->transfer_buffer, count,
((serial->type->write_bulk_callback) ?
serial->type->write_bulk_callback :
usb_serial_generic_write_bulk_callback),
port);
/* send the data out the bulk port */
result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
if (result) {
dev_err(&port->dev,
"%s - failed submitting write urb, error %d\n",
__func__, result);
/* don't have to grab the lock here, as we will
retry if != 0 */
port->write_urb_busy = 0;
} else
result = count;
return result;
}
int
efrm_filter_resource_alloc(struct vi_resource *vi_parent,
struct filter_resource **frs_out)
{
struct filter_resource *frs;
int rc, instance;
EFRM_ASSERT(frs_out);
EFRM_ASSERT(efrm_filter_manager);
EFRM_RESOURCE_MANAGER_ASSERT_VALID(&efrm_filter_manager->rm);
EFRM_ASSERT(vi_parent != NULL);
EFRM_ASSERT(EFRM_RESOURCE_TYPE(vi_parent->rs.rs_handle) ==
EFRM_RESOURCE_VI);
/* Allocate resource data structure. This is called in atomic
* context by the onload driver.
*/
frs = kmalloc(sizeof(struct filter_resource), GFP_ATOMIC);
if (!frs)
return -ENOMEM;
/* Allocate an instance. */
rc = kfifo_get(efrm_filter_manager->free_ids,
(unsigned char *)&instance, sizeof(instance));
if (rc != sizeof(instance)) {
EFRM_TRACE("%s: out of instances", __FUNCTION__);
EFRM_ASSERT(rc == 0);
rc = -EBUSY;
goto fail1;
}
/* Initialise the resource DS. */
efrm_resource_init(&frs->rs, EFRM_RESOURCE_FILTER, instance);
frs->pt = vi_parent;
efrm_resource_ref(&frs->pt->rs);
frs->filter_idx = -1;
EFRM_TRACE("%s: " EFRM_RESOURCE_FMT " VI %d", __FUNCTION__,
EFRM_RESOURCE_PRI_ARG(frs->rs.rs_handle),
EFRM_RESOURCE_INSTANCE(vi_parent->rs.rs_handle));
efrm_client_add_resource(vi_parent->rs.rs_client, &frs->rs);
*frs_out = frs;
return 0;
fail1:
memset(frs, 0, sizeof(*frs));
kfree(frs);
return rc;
}
// Reading from the SPI device
ssize_t dv_spi_read(struct file *filp, char __user *buf, size_t count, loff_t
*f_pos)
{
Uarray buf_val;
ssize_t status = 0;
if((NULL == buf)||(count <= 0))
{
return -1;
}
#if 0
len = kfifo_len(g_kfifo);
if(count > len)
{
count = len ;
}
memset(g_readbuf,0,sizeof(g_readbuf));
kfifo_get(g_kfifo,g_readbuf,count);
// Transferring data to user space
status = copy_to_user(buf, g_readbuf, count);
if(0 == status)
{
return count;
}
else
{
return -1;
}
#else
if(SPIBUF_RXEMPTY_MASK & SPI_REG(SPIBUF))
{
buf_val.udata = SPI_REG(SPIBUF);
count = (g_dataformat == format_8bit)?1:2;
// Transferring data to user space
status = copy_to_user(buf, buf_val.uarray,count);
if(0 == status)
{
return count;
}
else
{
return -1;
}
}
else
{
return -1;
}
#endif
}
/* Receiver */
static int cx23888_ir_rx_read(struct v4l2_subdev *sd, u8 *buf, size_t count,
ssize_t *num)
{
struct cx23888_ir_state *state = to_state(sd);
bool invert = (bool) atomic_read(&state->rx_invert);
u16 divider = (u16) atomic_read(&state->rxclk_divider);
unsigned int i, n;
u32 *p;
u32 u, v;
n = count / sizeof(u32) * sizeof(u32);
if (n == 0) {
*num = 0;
return 0;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 33)
n = kfifo_get(state->rx_kfifo, buf, n);
#else
n = kfifo_out_locked(&state->rx_kfifo, buf, n, &state->rx_kfifo_lock);
#endif
n /= sizeof(u32);
*num = n * sizeof(u32);
for (p = (u32 *) buf, i = 0; i < n; p++, i++) {
if ((*p & FIFO_RXTX_RTO) == FIFO_RXTX_RTO) {
*p = V4L2_SUBDEV_IR_PULSE_RX_SEQ_END;
v4l2_dbg(2, ir_888_debug, sd, "rx read: end of rx\n");
continue;
}
u = (*p & FIFO_RXTX_LVL) ? V4L2_SUBDEV_IR_PULSE_LEVEL_MASK : 0;
if (invert)
u = u ? 0 : V4L2_SUBDEV_IR_PULSE_LEVEL_MASK;
v = (u32) pulse_width_count_to_ns((u16) (*p & FIFO_RXTX),
divider);
if (v >= V4L2_SUBDEV_IR_PULSE_MAX_WIDTH_NS)
v = V4L2_SUBDEV_IR_PULSE_MAX_WIDTH_NS - 1;
*p = u | v;
v4l2_dbg(2, ir_888_debug, sd, "rx read: %10u ns %s\n",
v, u ? "mark" : "space");
}
return 0;
}
//字符超时接收模式读取函数
static s32 usart1_read_packet(u8* buff, u32 buff_len)
{
u8 BoxErr = 0; //邮箱接收错误标志
s32 ret = 0;
#if SYS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
SYS_CPU_SR cpu_sr = 0;
#endif
if(kfifo_len(&rx_fifo) > 0)
{
return kfifo_get(&rx_fifo,buff,buff_len);
}
SysMboxPend(rx_event, rx_timeout_ticks, &BoxErr); //邮箱接收挂起
if(BoxErr != 0)
{
return 0;
}
SYS_ENTER_CRITICAL();
ret = kfifo_get(&rx_fifo,buff,buff_len);
SYS_EXIT_CRITICAL();
return ret;
}
/* hclge_dbg_dump_mac_tnl_status: print message about mac tnl interrupt
* @hdev: pointer to struct hclge_dev
*/
static void hclge_dbg_dump_mac_tnl_status(struct hclge_dev *hdev)
{
#define HCLGE_BILLION_NANO_SECONDS 1000000000
struct hclge_mac_tnl_stats stats;
unsigned long rem_nsec;
dev_info(&hdev->pdev->dev, "Recently generated mac tnl interruption:\n");
while (kfifo_get(&hdev->mac_tnl_log, &stats)) {
rem_nsec = do_div(stats.time, HCLGE_BILLION_NANO_SECONDS);
dev_info(&hdev->pdev->dev, "[%07lu.%03lu]status = 0x%x\n",
(unsigned long)stats.time, rem_nsec / 1000,
stats.status);
}
}
static size_t uart16550_read(struct file *filp, const char *buffer, size_t size, loff_t *offset)
{
struct task_struct **task_user_get_data = ftask_user_get_data(filp->private_data);
struct kfifo *data_from_device = fdata_from_device (filp->private_data);
uint8_t u8;
int i;
char* pos = buffer;
for(i =0;i<size;i++)
{
wait_for_queue(task_user_get_data,can_read,data_from_device);
kfifo_get(data_from_device,&u8);
put_user(u8ToChar(u8),pos+i);
}
return size;
}
/*********functions which permit to communicate with the board****************/
UNS8 canReceive_driver(CAN_HANDLE fd0, Message *m)
{
long ret = wait_event_interruptible (((CANPipe*)fd0)->w_queue,
kfifo_len (((CANPipe*)fd0)->pipe) >= sizeof(Message));
// interrupted by signal
if (ret == -ERESTARTSYS)
return 2;
if (kfifo_get (((CANPipe*)fd0)->pipe, (unsigned char *)m, sizeof(Message)) != sizeof(Message))
{
printk(KERN_NOTICE "can_virtual: error receiving data from kernel fifo.\n");
return 1;
}
return 0;
}
struct iu_entry *srp_iu_get(struct srp_target *target)
{
struct iu_entry *iue = NULL;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 33)
kfifo_get(target->iu_queue.queue, (void *) &iue, sizeof(void *));
#else
if (kfifo_out_locked(&target->iu_queue.queue, (void *) &iue,
sizeof(void *), &target->iu_queue.lock) != sizeof(void *)) {
WARN_ONCE(1, "unexpected fifo state");
return NULL;
}
#endif
if (!iue)
return iue;
iue->target = target;
iue->flags = 0;
return iue;
}
static int __init testfunc(void)
{
unsigned char buf[6];
unsigned char i;
unsigned int ret;
printk(KERN_INFO "byte stream fifo test start\n");
/* put string into the fifo */
kfifo_in(&test, "hello", 5);
/* put values into the fifo */
for (i = 0; i != 10; i++)
kfifo_put(&test, &i);
/* show the number of used elements */
printk(KERN_INFO "fifo len: %u\n", kfifo_len(&test));
/* get max of 5 bytes from the fifo */
i = kfifo_out(&test, buf, 5);
printk(KERN_INFO "buf: %.*s\n", i, buf);
/* get max of 2 elements from the fifo */
ret = kfifo_out(&test, buf, 2);
printk(KERN_INFO "ret: %d\n", ret);
/* and put it back to the end of the fifo */
ret = kfifo_in(&test, buf, ret);
printk(KERN_INFO "ret: %d\n", ret);
/* put values into the fifo until is full */
for (i = 20; kfifo_put(&test, &i); i++)
;
printk(KERN_INFO "queue len: %u\n", kfifo_len(&test));
/* print out all values in the fifo */
while (kfifo_get(&test, &i))
printk("%d ", i);
printk("\n");
return 0;
}