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tty: usb_serial_mos7720: Fix get_lsr_info

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I made a correction for get_lsr_info, now it returns some meaningful
information. I tested it with two simultaneous simplex modem channels.

it is attached

Signed-off-by: Kees Schoenmakers <k.schoenmakers@sigmae.nl>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Kees Schoenmakers 2009-09-19 13:13:18 -07:00 committed by Live-CD User
parent 0f608f8926
commit 2f9ea55c98
1 changed files with 15 additions and 4 deletions
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19
drivers/usb/serial/mos7720.c
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@ -378,10 +378,14 @@ static int mos7720_open(struct tty_struct *tty,
/* Initialize MCS7720 -- Write Init values to corresponding Registers
*
* Register Index
* 0 : THR/RHR
* 1 : IER
* 2 : FCR
* 3 : LCR
* 4 : MCR
* 5 : LSR
* 6 : MSR
* 7 : SPR
*
* 0x08 : SP1/2 Control Reg
*/
@ -1250,15 +1254,22 @@ static void mos7720_set_termios(struct tty_struct *tty,
static int get_lsr_info(struct tty_struct *tty,
struct moschip_port *mos7720_port, unsigned int __user *value)
{
int count;
struct usb_serial_port *port = tty->driver_data;
unsigned int result = 0;
unsigned char data = 0;
int port_number = port->number - port->serial->minor;
int count;
count = mos7720_chars_in_buffer(tty);
if (count == 0) {
dbg("%s -- Empty", __func__);
result = TIOCSER_TEMT;
send_mos_cmd(port->serial, MOS_READ, port_number,
UART_LSR, &data);
if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
== (UART_LSR_TEMT | UART_LSR_THRE)) {
dbg("%s -- Empty", __func__);
result = TIOCSER_TEMT;
}
}
if (copy_to_user(value, &result, sizeof(int)))
return -EFAULT;
return 0;