usb: gadget: acm_ms: use function framework for ACM

This patch converts the acm_ms gadget to make use of the function
framework to request the ACM function.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 27 insertions, 6 deletions

diff --git a/drivers/usb/gadget/acm_ms.c b/drivers/usb/gadget/acm_ms.c
index 4105a06582f8..8f2b0e391534 100644
--- a/drivers/usb/gadget/acm_ms.c
+++ b/drivers/usb/gadget/acm_ms.c
@@ -40,8 +40,6 @@
  * the runtime footprint, and giving us at least some parts of what
  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  */
-#define USB_FACM_INCLUDED
-#include "f_acm.c"
 #include "f_mass_storage.c"
 
 /*-------------------------------------------------------------------------*/
@@ -112,12 +110,14 @@ static struct fsg_common fsg_common;
 
 /*-------------------------------------------------------------------------*/
 static unsigned char tty_line;
-
+static struct usb_function *f_acm;
+static struct usb_function_instance *f_acm_inst;
 /*
  * We _always_ have both ACM and mass storage functions.
  */
 static int __init acm_ms_do_config(struct usb_configuration *c)
 {
+        struct f_serial_opts *opts;
         int     status;
 
         if (gadget_is_otg(c->cdev->gadget)) {
@@ -125,16 +125,35 @@ static int __init acm_ms_do_config(struct usb_configuration *c)
                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
         }
 
+        f_acm_inst = usb_get_function_instance("acm");
+        if (IS_ERR(f_acm_inst))
+                return PTR_ERR(f_acm_inst);
+
+        opts = container_of(f_acm_inst, struct f_serial_opts, func_inst);
+        opts->port_num = tty_line;
+
+        f_acm = usb_get_function(f_acm_inst);
+        if (IS_ERR(f_acm)) {
+                status = PTR_ERR(f_acm);
+                goto err_func;
+        }
 
-        status = acm_bind_config(c, tty_line);
+        status = usb_add_function(c, f_acm);
         if (status < 0)
-                return status;
+                goto err_conf;
 
         status = fsg_bind_config(c->cdev, c, &fsg_common);
         if (status < 0)
-                return status;
+                goto err_fsg;
 
         return 0;
+err_fsg:
+        usb_remove_function(c, f_acm);
+err_conf:
+        usb_put_function(f_acm);
+err_func:
+        usb_put_function_instance(f_acm_inst);
+        return status;
 }
 
 static struct usb_configuration acm_ms_config_driver = {
@@ -195,6 +214,8 @@ fail0:
 
 static int __exit acm_ms_unbind(struct usb_composite_dev *cdev)
 {
+        usb_put_function(f_acm);
+        usb_put_function_instance(f_acm_inst);
         gserial_free_line(tty_line);
         return 0;
 }