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tty: n_gsm: expose gsmtty device nodes at ldisc open time

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The n_gsm driver being an ldisc, does not provide a convenient method
e.g. udev to create the tty device nodes automatically when the ldisc
is opened.

The TTY device nodes are now created via calls to tty_register_device
from the ldisc open.

Signed-off-by: Russ Gorby <russ.gorby@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Russ Gorby 2011-06-14 13:35:32 -07:00 committed by Greg Kroah-Hartman
parent 20ae6d0b30
commit d50f6dcaf2
1 changed files with 17 additions and 2 deletions
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19
drivers/tty/n_gsm.c
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@ -169,6 +169,7 @@ struct gsm_control {
struct gsm_mux {
struct tty_struct *tty; /* The tty our ldisc is bound to */
spinlock_t lock;
unsigned int num;
/* Events on the GSM channel */
wait_queue_head_t event;
@ -250,6 +251,8 @@ struct gsm_mux {
static struct gsm_mux *gsm_mux[MAX_MUX]; /* GSM muxes */
static spinlock_t gsm_mux_lock;
static struct tty_driver *gsm_tty_driver;
/*
* This section of the driver logic implements the GSM encodings
* both the basic and the 'advanced'. Reliable transport is not
@ -1996,6 +1999,7 @@ int gsm_activate_mux(struct gsm_mux *gsm)
spin_lock(&gsm_mux_lock);
for (i = 0; i < MAX_MUX; i++) {
if (gsm_mux[i] == NULL) {
gsm->num = i;
gsm_mux[i] = gsm;
break;
}
@ -2101,13 +2105,20 @@ static int gsmld_output(struct gsm_mux *gsm, u8 *data, int len)
static int gsmld_attach_gsm(struct tty_struct *tty, struct gsm_mux *gsm)
{
int ret;
int ret, i;
int base = gsm->num << 6; /* Base for this MUX */
gsm->tty = tty_kref_get(tty);
gsm->output = gsmld_output;
ret = gsm_activate_mux(gsm);
if (ret != 0)
tty_kref_put(gsm->tty);
else {
/* Don't register device 0 - this is the control channel and not
a usable tty interface */
for (i = 1; i < NUM_DLCI; i++)
tty_register_device(gsm_tty_driver, base + i, NULL);
}
return ret;
}
@ -2122,7 +2133,12 @@ static int gsmld_attach_gsm(struct tty_struct *tty, struct gsm_mux *gsm)
static void gsmld_detach_gsm(struct tty_struct *tty, struct gsm_mux *gsm)
{
int i;
int base = gsm->num << 6; /* Base for this MUX */
WARN_ON(tty != gsm->tty);
for (i = 1; i < NUM_DLCI; i++)
tty_unregister_device(gsm_tty_driver, base + i);
gsm_cleanup_mux(gsm);
tty_kref_put(gsm->tty);
gsm->tty = NULL;
@ -2712,7 +2728,6 @@ static int gsmtty_break_ctl(struct tty_struct *tty, int state)
return gsmtty_modem_update(dlci, encode);
}
static struct tty_driver *gsm_tty_driver;
/* Virtual ttys for the demux */
static const struct tty_operations gsmtty_ops = {