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USB: allow users to run setserial with cdc-acm

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We had a user report that running setserial on /dev/ttyACM0 didn't work.
He pointed at an old patch by Oliver Neukum from 2008 that never went anywhere..
http://permalink.gmane.org/gmane.linux.usb.general/9236

I made some minor changes to get it to apply again, and got the user to retest on 3.1,
and he reported it worked for him. https://bugzilla.redhat.com/show_bug.cgi?id=787607

The diff below is against 3.3rc. The only difference between this and
the version the user tested is the removal of the if (!ACM_READY) test
Havard removed ACM_READY in 99823f457d
I'm unclear if there's need for a different test in its place.

From: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Neukum 2012-02-17 17:21:24 -05:00 committed by Greg Kroah-Hartman
parent 4c95432682
commit 18c75720e6
1 changed files with 29 additions and 1 deletions
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30
drivers/usb/class/cdc-acm.c
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@ -39,6 +39,7 @@
#include <linux/serial.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
@ -773,10 +774,37 @@ static int acm_tty_tiocmset(struct tty_struct *tty,
return acm_set_control(acm, acm->ctrlout = newctrl);
}
static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
{
struct serial_struct tmp;
if (!info)
return -EINVAL;
memset(&tmp, 0, sizeof(tmp));
tmp.flags = ASYNC_LOW_LATENCY;
tmp.xmit_fifo_size = acm->writesize;
tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
if (copy_to_user(info, &tmp, sizeof(tmp)))
return -EFAULT;
else
return 0;
}
static int acm_tty_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
return -ENOIOCTLCMD;
struct acm *acm = tty->driver_data;
int rv = -ENOIOCTLCMD;
switch (cmd) {
case TIOCGSERIAL: /* gets serial port data */
rv = get_serial_info(acm, (struct serial_struct __user *) arg);
break;
}
return rv;
}
static const __u32 acm_tty_speed[] = {