diff options
| author | Johan Hovold <jhovold@gmail.com> | 2013-03-21 15:37:30 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-03-26 00:52:28 +0400 |
| commit | e1ed212d8593f8d5036709ae257e0e019dbecd4f (patch) | |
| tree | 40a13bc9518f5aa51d99eb1ee69d1b8347d89dff /drivers/usb/serial | |
| parent | 4d63143db1426342f186cfe258db73571bf57897 (diff) | |
| download | linux-e1ed212d8593f8d5036709ae257e0e019dbecd4f.tar.xz | |
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>
Diffstat (limited to 'drivers/usb/serial')
| -rw-r--r-- | drivers/usb/serial/spcp8x5.c | 27 |
1 files changed, 10 insertions, 17 deletions
diff --git a/drivers/usb/serial/spcp8x5.c b/drivers/usb/serial/spcp8x5.c index a454a3f1acb3..cf3df793c2b7 100644 --- a/drivers/usb/serial/spcp8x5.c +++ b/drivers/usb/serial/spcp8x5.c @@ -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) |