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authorMartin Hundebøll <martin@geanix.com>2019-08-12 23:12:43 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-09-04 12:43:54 +0200
commita7b121b4b8b0bcc14fc1c2a81d34096109a65dd6 (patch)
tree19c00636e4d396d430f254ad841f4226134b6f30 /drivers/tty
parentserial: 8250_pci: Merge 8250_moxa to 8250_pci (diff)
downloadlinux-a7b121b4b8b0bcc14fc1c2a81d34096109a65dd6.tar.xz
linux-a7b121b4b8b0bcc14fc1c2a81d34096109a65dd6.zip
tty: n_gsm: add ioctl to map serial device to mux'ed tty
Guessing the first tty for a gsm0710 multiplexed serial device is not currently possible, which makes it racy to use with multiple modems. Add a way to map the physical serial tty to its related mux devices using an ioctl. Signed-off-by: Martin Hundebøll <martin@geanix.com> Link: https://lore.kernel.org/r/20190812211243.98686-1-martin@geanix.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/n_gsm.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index a60be591f1fc..d30525946892 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -2613,6 +2613,7 @@ static int gsmld_ioctl(struct tty_struct *tty, struct file *file,
{
struct gsm_config c;
struct gsm_mux *gsm = tty->disc_data;
+ unsigned int base;
switch (cmd) {
case GSMIOC_GETCONF:
@@ -2624,6 +2625,9 @@ static int gsmld_ioctl(struct tty_struct *tty, struct file *file,
if (copy_from_user(&c, (void *)arg, sizeof(c)))
return -EFAULT;
return gsm_config(gsm, &c);
+ case GSMIOC_GETFIRST:
+ base = mux_num_to_base(gsm);
+ return put_user(base + 1, (__u32 __user *)arg);
default:
return n_tty_ioctl_helper(tty, file, cmd, arg);
}