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USB: spcp8x5: add proper modem-status support 

Fetch modem status on carrier_raised and tiocmget.

This driver appeared to support modem-status but only read the modem
status registers once at open and then used that cached value for all
further enquires.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2013-03-21 12:37:30 +01:00 committed by Greg Kroah-Hartman
parent 4d63143db1
commit e1ed212d85
1 changed files with 10 additions and 17 deletions
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27
drivers/usb/serial/spcp8x5.c
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@ -1,7 +1,7 @@
/*
* spcp8x5 USB to serial adaptor driver
*
* Copyright (C) 2010 Johan Hovold (jhovold@gmail.com)
* Copyright (C) 2010-2013 Johan Hovold (jhovold@gmail.com)
* Copyright (C) 2006 Linxb (xubin.lin@worldplus.com.cn)
* Copyright (C) 2006 S1 Corp.
*
@ -145,7 +145,6 @@ struct spcp8x5_private {
unsigned quirks;
spinlock_t lock;
u8 line_control;
u8 line_status;
};
static int spcp8x5_probe(struct usb_serial *serial,
@ -249,9 +248,11 @@ static void spcp8x5_set_work_mode(struct usb_serial_port *port, u16 value,
static int spcp8x5_carrier_raised(struct usb_serial_port *port)
{
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
u8 msr;
int ret;
if (priv->line_status & MSR_STATUS_LINE_DCD)
ret = spcp8x5_get_msr(port, &msr);
if (ret || msr & MSR_STATUS_LINE_DCD)
return 1;
return 0;
@ -397,9 +398,6 @@ static int spcp8x5_open(struct tty_struct *tty, struct usb_serial_port *port)
struct usb_serial *serial = port->serial;
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
int ret;
unsigned long flags;
u8 status = 0x30;
/* status 0x30 means DSR and CTS = 1 other CDC RI and delta = 0 */
usb_clear_halt(serial->dev, port->write_urb->pipe);
usb_clear_halt(serial->dev, port->read_urb->pipe);
@ -412,17 +410,9 @@ static int spcp8x5_open(struct tty_struct *tty, struct usb_serial_port *port)
spcp8x5_set_ctrl_line(port, priv->line_control);
/* Setup termios */
if (tty)
spcp8x5_set_termios(tty, port, &tmp_termios);
spcp8x5_get_msr(port, &status);
/* may be we should update uart status here but now we did not do */
spin_lock_irqsave(&priv->lock, flags);
priv->line_status = status & 0xf0 ;
spin_unlock_irqrestore(&priv->lock, flags);
port->port.drain_delay = 256;
return usb_serial_generic_open(tty, port);
@ -457,12 +447,15 @@ static int spcp8x5_tiocmget(struct tty_struct *tty)
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned int mcr;
unsigned int status;
u8 status;
unsigned int result;
result = spcp8x5_get_msr(port, &status);
if (result)
return result;
spin_lock_irqsave(&priv->lock, flags);
mcr = priv->line_control;
status = priv->line_status;
spin_unlock_irqrestore(&priv->lock, flags);
result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)