/*
* em28xx_read_reg_req()
* reads data from the usb device specifying bRequest
*/
int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
char *buf, int len)
{
int ret;
struct usb_device *udev = interface_to_usbdev(dev->intf);
int pipe = usb_rcvctrlpipe(udev, 0);
if (dev->disconnected)
return -ENODEV;
if (len > URB_MAX_CTRL_SIZE)
return -EINVAL;
mutex_lock(&dev->ctrl_urb_lock);
ret = usb_control_msg(udev, pipe, req,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0x0000, reg, dev->urb_buf, len, HZ);
if (ret < 0) {
em28xx_regdbg("(pipe 0x%08x): IN: %02x %02x %02x %02x %02x %02x %02x %02x failed with error %i\n",
pipe,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
req, 0, 0,
reg & 0xff, reg >> 8,
len & 0xff, len >> 8, ret);
mutex_unlock(&dev->ctrl_urb_lock);
return usb_translate_errors(ret);
}
static int opticon_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
struct opticon_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
bool rts;
bool changed = false;
int ret;
/* We only support RTS so we only handle that */
spin_lock_irqsave(&priv->lock, flags);
rts = priv->rts;
if (set & TIOCM_RTS)
priv->rts = true;
if (clear & TIOCM_RTS)
priv->rts = false;
changed = rts ^ priv->rts;
spin_unlock_irqrestore(&priv->lock, flags);
if (!changed)
return 0;
ret = send_control_msg(port, CONTROL_RTS, !rts);
if (ret)
return usb_translate_errors(ret);
return 0;
}
static int pl2303_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
struct pl2303_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
u8 control;
int ret;
spin_lock_irqsave(&priv->lock, flags);
if (set & TIOCM_RTS)
priv->line_control |= CONTROL_RTS;
if (set & TIOCM_DTR)
priv->line_control |= CONTROL_DTR;
if (clear & TIOCM_RTS)
priv->line_control &= ~CONTROL_RTS;
if (clear & TIOCM_DTR)
priv->line_control &= ~CONTROL_DTR;
control = priv->line_control;
spin_unlock_irqrestore(&priv->lock, flags);
ret = pl2303_set_control_lines(port, control);
if (ret)
return usb_translate_errors(ret);
return 0;
}
static int wdm_flush(struct file *file, fl_owner_t id)
{
struct wdm_device *desc = file->private_data;
wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags));
/* cannot dereference desc->intf if WDM_DISCONNECTING */
if (desc->werr < 0 && !test_bit(WDM_DISCONNECTING, &desc->flags))
dev_err(&desc->intf->dev, "Error in flush path: %d\n",
desc->werr);
return usb_translate_errors(desc->werr);
}
/* Fill the buffer. Called with dev->lock held
*/
static int _chaoskey_fill(struct chaoskey *dev)
{
DEFINE_WAIT(wait);
int result;
bool started;
usb_dbg(dev->interface, "fill");
/* Return immediately if someone called before the buffer was
* empty */
if (dev->valid != dev->used) {
usb_dbg(dev->interface, "not empty yet (valid %d used %d)",
dev->valid, dev->used);
return 0;
}
/* Bail if the device has been removed */
if (!dev->present) {
usb_dbg(dev->interface, "device not present");
return -ENODEV;
}
/* Make sure the device is awake */
result = usb_autopm_get_interface(dev->interface);
if (result) {
usb_dbg(dev->interface, "wakeup failed (result %d)", result);
return result;
}
dev->reading = true;
result = usb_submit_urb(dev->urb, GFP_KERNEL);
if (result < 0) {
result = usb_translate_errors(result);
dev->reading = false;
goto out;
}
/* The first read on the Alea takes a little under 2 seconds.
* Reads after the first read take only a few microseconds
* though. Presumably the entropy-generating circuit needs
* time to ramp up. So, we wait longer on the first read.
*/
started = dev->reads_started;
dev->reads_started = true;
result = wait_event_interruptible_timeout(
dev->wait_q,
!dev->reading,
(started ? NAK_TIMEOUT : ALEA_FIRST_TIMEOUT) );
if (result < 0)
goto out;
if (result == 0)
result = -ETIMEDOUT;
else
result = dev->valid;
out:
/* Let the device go back to sleep eventually */
usb_autopm_put_interface(dev->interface);
usb_dbg(dev->interface, "read %d bytes", dev->valid);
return result;
}
