greybus: uart-gb: more work on tty functions

diff --git a/drivers/staging/greybus/uart-gb.c b/drivers/staging/greybus/uart-gb.c
index 95273073a4af2184c4b5dbab1e2f2d7edd8b10e2..3eaada99951fc6f0665d22ff607f02e289b9dd7d 100644 (file)
--- a/drivers/staging/greybus/uart-gb.c
+++ b/drivers/staging/greybus/uart-gb.c
@@ -13,6 +13,7 @@
 #include <linux/serial.h>
 #include <linux/tty_driver.h>
 #include <linux/tty_flip.h>
+#include <linux/idr.h>
 #include "greybus.h"
 
 #define GB_TTY_MAJOR 180       /* FIXME use a real number!!! */
@@ -31,6 +32,89 @@ static const struct greybus_device_id id_table[] = {
        { },    /* terminating NULL entry */
 };
 
+static struct tty_driver *gb_tty_driver;
+static DEFINE_IDR(tty_minors);
+static DEFINE_MUTEX(table_lock);
+
+static struct gb_tty *get_gb_by_minor(unsigned minor)
+{
+       struct gb_tty *gb_tty;
+
+       mutex_lock(&table_lock);
+       gb_tty = idr_find(&tty_minors, minor);
+       mutex_unlock(&table_lock);
+       return gb_tty;
+}
+
+static int alloc_minor(struct gb_tty *gb_tty)
+{
+       int minor;
+
+       mutex_lock(&table_lock);
+       minor = idr_alloc(&tty_minors, gb_tty, 0, 0, GFP_KERNEL);
+       if (minor < 0)
+               goto error;
+       gb_tty->minor = minor;
+error:
+       mutex_unlock(&table_lock);
+       return minor;
+}
+
+static void release_minor(struct gb_tty *gb_tty)
+{
+       mutex_lock(&table_lock);
+       idr_remove(&tty_minors, gb_tty->minor);
+       mutex_unlock(&table_lock);
+}
+
+static int gb_tty_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+       struct gb_tty *gb_tty;
+       int retval;
+
+       gb_tty = get_gb_by_minor(tty->index);
+       if (!gb_tty)
+               return -ENODEV;
+
+       retval = tty_standard_install(driver, tty);
+       if (retval)
+               goto error;
+
+       tty->driver_data = gb_tty;
+       return 0;
+error:
+       tty_port_put(&gb_tty->port);
+       return retval;
+}
+
+static int gb_tty_open(struct tty_struct *tty, struct file *file)
+{
+       struct gb_tty *gb_tty = tty->driver_data;
+
+       return tty_port_open(&gb_tty->port, tty, file);
+}
+
+static void gb_tty_close(struct tty_struct *tty, struct file *file)
+{
+       struct gb_tty *gb_tty = tty->driver_data;
+
+       tty_port_close(&gb_tty->port, tty, file);
+}
+
+static void gb_tty_cleanup(struct tty_struct *tty)
+{
+       struct gb_tty *gb_tty = tty->driver_data;
+
+       tty_port_put(&gb_tty->port);
+}
+
+static void gb_tty_hangup(struct tty_struct *tty)
+{
+       struct gb_tty *gb_tty = tty->driver_data;
+
+       tty_port_hangup(&gb_tty->port);
+}
+
 
 static const struct tty_operations gb_ops = {
        .install =              gb_tty_install,
@@ -50,8 +134,6 @@ static const struct tty_operations gb_ops = {
        .tiocmset =             gb_tty_tiocmset,
 };
 
-static struct tty_driver *gb_tty_driver;
-static struct gb_tty *gb_tty_table[255];
 
 static int tty_gb_probe(struct greybus_device *gdev, const struct greybus_device_id *id)
 {