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usb: gadget: u_serial: convert into a module

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Every user of u_serial has now to select the U_SERIAL symbol instead of
including the file.
There is one limition with this: ports and and gs_tty_driver are global
variables in u_serial. Since all users share them, there can be only one
user loaded at a time i.e. either g_serial or g_nokia.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Sebastian Andrzej Siewior
2012-12-23 21:10:04 +01:00
committed by Felipe Balbi
parent 48177cd837
commit 3249ca22c0
9 changed files with 23 additions and 9 deletions
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13
drivers/usb/gadget/u_serial.c
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@@ -26,6 +26,7 @@
#include <linux/tty_flip.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/module.h>
#include "u_serial.h"
@@ -309,6 +310,7 @@ gs_alloc_req(struct usb_ep *ep, unsigned len, gfp_t kmalloc_flags)
return req;
}
EXPORT_SYMBOL_GPL(gs_alloc_req);
/*
* gs_free_req
@@ -320,6 +322,7 @@ void gs_free_req(struct usb_ep *ep, struct usb_request *req)
kfree(req->buf);
usb_ep_free_request(ep, req);
}
EXPORT_SYMBOL_GPL(gs_free_req);
/*
* gs_send_packet
@@ -1081,6 +1084,9 @@ int gserial_setup(struct usb_gadget *g, unsigned count)
if (count == 0 || count > N_PORTS)
return -EINVAL;
if (gs_tty_driver)
return -EBUSY;
gs_tty_driver = alloc_tty_driver(count);
if (!gs_tty_driver)
return -ENOMEM;
@@ -1153,6 +1159,7 @@ fail:
gs_tty_driver = NULL;
return status;
}
EXPORT_SYMBOL_GPL(gserial_setup);
static int gs_closed(struct gs_port *port)
{
@@ -1213,6 +1220,7 @@ void gserial_cleanup(void)
pr_debug("%s: cleaned up ttyGS* support\n", __func__);
}
EXPORT_SYMBOL_GPL(gserial_cleanup);
/**
* gserial_connect - notify TTY I/O glue that USB link is active
@@ -1292,7 +1300,7 @@ fail_out:
gser->in->driver_data = NULL;
return status;
}
EXPORT_SYMBOL_GPL(gserial_connect);
/**
* gserial_disconnect - notify TTY I/O glue that USB link is inactive
* @gser: the function, on which gserial_connect() was called
@@ -1347,3 +1355,6 @@ void gserial_disconnect(struct gserial *gser)
spin_unlock_irqrestore(&port->port_lock, flags);
}
EXPORT_SYMBOL_GPL(gserial_disconnect);
MODULE_LICENSE("GPL");