Merge tag 'usb-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb

[firefly-linux-kernel-4.4.55.git] / drivers / usb / class / cdc-acm.c

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 6bb8472155c6a106a35ae111bc241a8b4ed20ce1..b32ccb46101960b62e2e81bf4f0b655797a45668 100644 (file)
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -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>
@@ -768,10 +769,37 @@ 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[] = {