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authorRuss Gorby <russ.gorby@intel.com>2011-06-15 00:35:32 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2011-07-02 02:33:11 +0400
commitd50f6dcaf22a3234a65ae4f6087173e66b7fff56 (patch)
tree31ebf5b0c30438942ba541cb442984321c882109
parent20ae6d0b307963416db0e8433602e5d5c95e942b (diff)
downloadlinux-d50f6dcaf22a3234a65ae4f6087173e66b7fff56.tar.xz
tty: n_gsm: expose gsmtty device nodes at ldisc open time
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>
-rw-r--r--drivers/tty/n_gsm.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 09e8c7d53af3..b288ff6cb812 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -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 = {