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| author | Martin Hundebøll <martin@geanix.com> | 2019-08-12 23:12:43 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-04 12:43:54 +0200 |
| commit | a7b121b4b8b0bcc14fc1c2a81d34096109a65dd6 (patch) | |
| tree | 19c00636e4d396d430f254ad841f4226134b6f30 /drivers/tty/n_gsm.c | |
| parent | serial: 8250_pci: Merge 8250_moxa to 8250_pci (diff) | |
| download | linux-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/n_gsm.c')
| -rw-r--r-- | drivers/tty/n_gsm.c | 4 |
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); } |