/* poll the device fifo status register. not to be confused with
* the poll syscall. */
static void cm4040_do_poll(unsigned long dummy)
{
struct reader_dev *dev = (struct reader_dev *) dummy;
unsigned int obs = xinb(dev->p_dev->resource[0]->start
+ REG_OFFSET_BUFFER_STATUS);
if ((obs & BSR_BULK_IN_FULL)) {
set_bit(BS_READABLE, &dev->buffer_status);
DEBUGP(4, dev, "waking up read_wait\n");
wake_up_interruptible(&dev->read_wait);
} else
clear_bit(BS_READABLE, &dev->buffer_status);
if (!(obs & BSR_BULK_OUT_FULL)) {
set_bit(BS_WRITABLE, &dev->buffer_status);
DEBUGP(4, dev, "waking up write_wait\n");
wake_up_interruptible(&dev->write_wait);
} else
clear_bit(BS_WRITABLE, &dev->buffer_status);
if (dev->buffer_status)
wake_up_interruptible(&dev->poll_wait);
mod_timer(&dev->poll_timer, jiffies + POLL_PERIOD);
}
static int wait_for_bulk_out_ready(struct reader_dev *dev)
{
int i, rc;
int iobase = dev->p_dev->resource[0]->start;
for (i = 0; i < POLL_LOOP_COUNT; i++) {
if ((xinb(iobase + REG_OFFSET_BUFFER_STATUS)
& BSR_BULK_OUT_FULL) == 0) {
DEBUGP(4, dev, "BulkOut empty (i=%d)\n", i);
return 1;
}
}
DEBUGP(4, dev, "wait_event_interruptible_timeout(timeout=%ld\n",
dev->timeout);
rc = wait_event_interruptible_timeout(dev->write_wait,
test_and_clear_bit(BS_WRITABLE,
&dev->buffer_status),
dev->timeout);
if (rc > 0)
DEBUGP(4, dev, "woke up: BulkOut empty\n");
else if (rc == 0)
DEBUGP(4, dev, "woke up: BulkOut full, returning 0 :(\n");
else if (rc < 0)
DEBUGP(4, dev, "woke up: signal arrived\n");
return rc;
}
static int wait_for_bulk_in_ready(struct reader_dev *dev)
{
int i, rc;
int iobase = dev->p_dev->io.BasePort1;
for (i = 0; i < POLL_LOOP_COUNT; i++) {
if ((xinb(iobase + REG_OFFSET_BUFFER_STATUS)
& BSR_BULK_IN_FULL) == BSR_BULK_IN_FULL) {
DEBUGP(3, dev, "BulkIn full (i=%d)\n", i);
return 1;
}
}
DEBUGP(4, dev, "wait_event_interruptible_timeout(timeout=%ld\n",
dev->timeout);
rc = wait_event_interruptible_timeout(dev->read_wait,
test_and_clear_bit(BS_READABLE,
&dev->buffer_status),
dev->timeout);
if (rc > 0)
DEBUGP(4, dev, "woke up: BulkIn full\n");
else if (rc == 0)
DEBUGP(4, dev, "woke up: BulkIn not full, returning 0 :(\n");
else if (rc < 0)
DEBUGP(4, dev, "woke up: signal arrived\n");
return rc;
}
static ssize_t cm4040_read(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
{
struct reader_dev *dev = filp->private_data;
int iobase = dev->p_dev->io.BasePort1;
size_t bytes_to_read;
unsigned long i;
size_t min_bytes_to_read;
int rc;
unsigned char uc;
DEBUGP(2, dev, "-> cm4040_read(%s,%d)\n", current->comm, current->pid);
if (count == 0)
return 0;
if (count < 10)
return -EFAULT;
if (filp->f_flags & O_NONBLOCK) {
DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
DEBUGP(2, dev, "<- cm4040_read (failure)\n");
return -EAGAIN;
}
if (!pcmcia_dev_present(dev->p_dev))
return -ENODEV;
for (i = 0; i < 5; i++) {
rc = wait_for_bulk_in_ready(dev);
if (rc <= 0) {
DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
DEBUGP(2, dev, "<- cm4040_read (failed)\n");
if (rc == -ERESTARTSYS)
return rc;
return -EIO;
}
dev->r_buf[i] = xinb(iobase + REG_OFFSET_BULK_IN);
#ifdef PCMCIA_DEBUG
if (pc_debug >= 6)
printk(KERN_DEBUG "%lu:%2x ", i, dev->r_buf[i]);
}
printk("\n");
#else
}
