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Subject[PATCHv2 2/7] tty: n_gsm: expose gsmtty device nodes at ldisc open time
Date
The 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 npw created via calls to tty_register_device

Signed-off-by: Russ Gorby <russ.gorby@intel.com>
---
drivers/tty/n_gsm.c | 19 +++++++++++++++++--
1 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 47897c2..0a2a5da 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -190,6 +190,7 @@ 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;
@@ -271,6 +272,8 @@ 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
@@ -2023,6 +2026,7 @@ 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;
}
@@ -2128,13 +2132,20 @@ 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;
}

@@ -2149,7 +2160,12 @@ 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;
@@ -2958,7 +2974,6 @@ 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 = {
--
1.7.0.4


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