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Code Issues Releases Wiki Activity

ft232: support the ASYNC_LOW_LATENCY flag

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This allows users to use the standard setserial command with this FT232
feature as well as obscure chip specific interfaces we have now. We keep
track of and respect the sysfs value for non-low-latency cases. In theory we
could do smart stuff with VTIME and the like but this seems of questionable
worth.

Closes-bug: http://bugzilla.kernel.org/show_bug.cgi?id=9120
Signed-off-by: Alan Cox <alan@linux.intel.com)
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox 2009-06-11 13:55:34 +01:00 committed by Linus Torvalds
parent 4cc27bd6d7
commit 557aaa7ffa
1 changed files with 60 additions and 34 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

94
drivers/usb/serial/ftdi_sio.c
View file

@ -89,6 +89,7 @@ struct ftdi_private {
int force_rtscts; /* if non-zero, force RTS-CTS to always
be enabled */
unsigned int latency; /* latency setting in use */
spinlock_t tx_lock; /* spinlock for transmit state */
unsigned long tx_bytes;
unsigned long tx_outstanding_bytes;
@ -1038,7 +1039,54 @@ static int change_speed(struct tty_struct *tty, struct usb_serial_port *port)
return rv;
}
static int write_latency_timer(struct usb_serial_port *port)
{
struct ftdi_private *priv = usb_get_serial_port_data(port);
struct usb_device *udev = port->serial->dev;
char buf[1];
int rv = 0;
int l = priv->latency;
if (priv->flags & ASYNC_LOW_LATENCY)
l = 1;
dbg("%s: setting latency timer = %i", __func__, l);
rv = usb_control_msg(udev,
usb_sndctrlpipe(udev, 0),
FTDI_SIO_SET_LATENCY_TIMER_REQUEST,
FTDI_SIO_SET_LATENCY_TIMER_REQUEST_TYPE,
l, priv->interface,
buf, 0, WDR_TIMEOUT);
if (rv < 0)
dev_err(&port->dev, "Unable to write latency timer: %i\n", rv);
return rv;
}
static int read_latency_timer(struct usb_serial_port *port)
{
struct ftdi_private *priv = usb_get_serial_port_data(port);
struct usb_device *udev = port->serial->dev;
unsigned short latency = 0;
int rv = 0;
dbg("%s", __func__);
rv = usb_control_msg(udev,
usb_rcvctrlpipe(udev, 0),
FTDI_SIO_GET_LATENCY_TIMER_REQUEST,
FTDI_SIO_GET_LATENCY_TIMER_REQUEST_TYPE,
0, priv->interface,
(char *) &latency, 1, WDR_TIMEOUT);
if (rv < 0) {
dev_err(&port->dev, "Unable to read latency timer: %i\n", rv);
return -EIO;
}
return latency;
}
static int get_serial_info(struct usb_serial_port *port,
struct serial_struct __user *retinfo)
@ -1098,6 +1146,7 @@ static int set_serial_info(struct tty_struct *tty,
priv->custom_divisor = new_serial.custom_divisor;
tty->low_latency = (priv->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
write_latency_timer(port);
check_and_exit:
if ((old_priv.flags & ASYNC_SPD_MASK) !=
@ -1193,27 +1242,13 @@ static ssize_t show_latency_timer(struct device *dev,
{
struct usb_serial_port *port = to_usb_serial_port(dev);
struct ftdi_private *priv = usb_get_serial_port_data(port);
struct usb_device *udev = port->serial->dev;
unsigned short latency = 0;
int rv = 0;
dbg("%s", __func__);
rv = usb_control_msg(udev,
usb_rcvctrlpipe(udev, 0),
FTDI_SIO_GET_LATENCY_TIMER_REQUEST,
FTDI_SIO_GET_LATENCY_TIMER_REQUEST_TYPE,
0, priv->interface,
(char *) &latency, 1, WDR_TIMEOUT);
if (rv < 0) {
dev_err(dev, "Unable to read latency timer: %i\n", rv);
return -EIO;
}
return sprintf(buf, "%i\n", latency);
if (priv->flags & ASYNC_LOW_LATENCY)
return sprintf(buf, "1\n");
else
return sprintf(buf, "%i\n", priv->latency);
}
/* Write a new value of the latency timer, in units of milliseconds. */
static ssize_t store_latency_timer(struct device *dev,
struct device_attribute *attr, const char *valbuf,
@ -1221,25 +1256,13 @@ static ssize_t store_latency_timer(struct device *dev,
{
struct usb_serial_port *port = to_usb_serial_port(dev);
struct ftdi_private *priv = usb_get_serial_port_data(port);
struct usb_device *udev = port->serial->dev;
char buf[1];
int v = simple_strtoul(valbuf, NULL, 10);
int rv = 0;
dbg("%s: setting latency timer = %i", __func__, v);
rv = usb_control_msg(udev,
usb_sndctrlpipe(udev, 0),
FTDI_SIO_SET_LATENCY_TIMER_REQUEST,
FTDI_SIO_SET_LATENCY_TIMER_REQUEST_TYPE,
v, priv->interface,
buf, 0, WDR_TIMEOUT);
if (rv < 0) {
dev_err(dev, "Unable to write latency timer: %i\n", rv);
priv->latency = v;
rv = write_latency_timer(port);
if (rv < 0)
return -EIO;
}
return count;
}
@ -1393,6 +1416,7 @@ static int ftdi_sio_port_probe(struct usb_serial_port *port)
usb_set_serial_port_data(port, priv);
ftdi_determine_type(port);
read_latency_timer(port);
create_sysfs_attrs(port);
return 0;
}
@ -1515,6 +1539,8 @@ static int ftdi_open(struct tty_struct *tty,
if (tty)
tty->low_latency = (priv->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
write_latency_timer(port);
/* No error checking for this (will get errors later anyway) */
/* See ftdi_sio.h for description of what is reset */
usb_control_msg(dev, usb_sndctrlpipe(dev, 0),