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USB: serial: ftdi_sio: add support for TIOCSERGETLSR

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Willem-Jan noticed that the ftdi_sio driver did not support the
TIOCSERGETLSR ioctl, and some userspace programs rely on it.  This patch
adds the support.

Reported-by: Willem-Jan de Hoog <wdehoog@exalondelft.nl>
Tested-by: Willem-Jan de Hoog <wdehoog@exalondelft.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman 2010-12-16 13:40:42 -08:00
parent 0247a7bcd4
commit c466cd2bb9
1 changed files with 27 additions and 0 deletions
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27
drivers/usb/serial/ftdi_sio.c
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@ -75,6 +75,7 @@ struct ftdi_private {
unsigned long last_dtr_rts; /* saved modem control outputs */
wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
char prev_status, diff_status; /* Used for TIOCMIWAIT */
char transmit_empty; /* If transmitter is empty or not */
struct usb_serial_port *port;
__u16 interface; /* FT2232C, FT2232H or FT4232H port interface
(0 for FT232/245) */
@ -1322,6 +1323,23 @@ check_and_exit:
return 0;
}
static int get_lsr_info(struct usb_serial_port *port,
struct serial_struct __user *retinfo)
{
struct ftdi_private *priv = usb_get_serial_port_data(port);
unsigned int result = 0;
if (!retinfo)
return -EFAULT;
if (priv->transmit_empty)
result = TIOCSER_TEMT;
if (copy_to_user(retinfo, &result, sizeof(unsigned int)))
return -EFAULT;
return 0;
}
/* Determine type of FTDI chip based on USB config and descriptor. */
static void ftdi_determine_type(struct usb_serial_port *port)
@ -1871,6 +1889,12 @@ static int ftdi_process_packet(struct tty_struct *tty,
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
}
/* save if the transmitter is empty or not */
if (packet[1] & FTDI_RS_TEMT)
priv->transmit_empty = 1;
else
priv->transmit_empty = 0;
len -= 2;
if (!len)
return 0; /* status only */
@ -2234,6 +2258,9 @@ static int ftdi_ioctl(struct tty_struct *tty, struct file *file,
}
}
return 0;
case TIOCSERGETLSR:
return get_lsr_info(port, (struct serial_struct __user *)arg);
break;
default:
break;
}