usb: gadget: the start of the configfs interface

[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / usb / gadget / f_acm.c

diff --git a/drivers/usb/gadget/f_acm.c b/drivers/usb/gadget/f_acm.c
index ba7daaa..4b7e33e 100644 (file)
--- a/drivers/usb/gadget/f_acm.c
+++ b/drivers/usb/gadget/f_acm.c
@@ -763,6 +763,59 @@ static struct usb_function *acm_alloc_func(struct usb_function_instance *fi)
        return &acm->port.func;
 }
 
+static inline struct f_serial_opts *to_f_serial_opts(struct config_item *item)
+{
+       return container_of(to_config_group(item), struct f_serial_opts,
+                       func_inst.group);
+}
+
+CONFIGFS_ATTR_STRUCT(f_serial_opts);
+static ssize_t f_acm_attr_show(struct config_item *item,
+                                struct configfs_attribute *attr,
+                                char *page)
+{
+       struct f_serial_opts *opts = to_f_serial_opts(item);
+       struct f_serial_opts_attribute *f_serial_opts_attr =
+               container_of(attr, struct f_serial_opts_attribute, attr);
+       ssize_t ret = 0;
+
+       if (f_serial_opts_attr->show)
+               ret = f_serial_opts_attr->show(opts, page);
+       return ret;
+}
+
+static void acm_attr_release(struct config_item *item)
+{
+       struct f_serial_opts *opts = to_f_serial_opts(item);
+
+       usb_put_function_instance(&opts->func_inst);
+}
+
+static struct configfs_item_operations acm_item_ops = {
+       .release                = acm_attr_release,
+       .show_attribute         = f_acm_attr_show,
+};
+
+static ssize_t f_acm_port_num_show(struct f_serial_opts *opts, char *page)
+{
+       return sprintf(page, "%u\n", opts->port_num);
+}
+
+static struct f_serial_opts_attribute f_acm_port_num =
+       __CONFIGFS_ATTR_RO(port_num, f_acm_port_num_show);
+
+
+static struct configfs_attribute *acm_attrs[] = {
+       &f_acm_port_num.attr,
+       NULL,
+};
+
+static struct config_item_type acm_func_type = {
+       .ct_item_ops    = &acm_item_ops,
+       .ct_attrs       = acm_attrs,
+       .ct_owner       = THIS_MODULE,
+};
+
 static void acm_free_instance(struct usb_function_instance *fi)
 {
        struct f_serial_opts *opts;
@@ -786,6 +839,8 @@ static struct usb_function_instance *acm_alloc_instance(void)
                kfree(opts);
                return ERR_PTR(ret);
        }
+       config_group_init_type_name(&opts->func_inst.group, "",
+                       &acm_func_type);
        return &opts->func_inst;
 }
 DECLARE_USB_FUNCTION_INIT(acm, acm_alloc_instance, acm_alloc_func);