usb: gadget: f_serial: add configfs support

this patch implements the new configfs based interface
on f_serial function driver.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/drivers/usb/gadget/f_serial.c b/drivers/usb/gadget/f_serial.c
index 49c3d146f9b0..981113c9924d 100644
--- a/drivers/usb/gadget/f_serial.c
+++ b/drivers/usb/gadget/f_serial.c
@@ -258,6 +258,59 @@ fail:
         return status;
 }
 
+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_serial_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 serial_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 serial_item_ops = {
+        .release        = serial_attr_release,
+        .show_attribute = f_serial_attr_show,
+};
+
+static ssize_t f_serial_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_serial_port_num =
+        __CONFIGFS_ATTR_RO(port_num, f_serial_port_num_show);
+
+static struct configfs_attribute *acm_attrs[] = {
+        &f_serial_port_num.attr,
+        NULL,
+};
+
+static struct config_item_type serial_func_type = {
+        .ct_item_ops    = &serial_item_ops,
+        .ct_attrs       = acm_attrs,
+        .ct_owner       = THIS_MODULE,
+};
+
 static void gser_free_inst(struct usb_function_instance *f)
 {
         struct f_serial_opts *opts;
@@ -282,6 +335,8 @@ static struct usb_function_instance *gser_alloc_inst(void)
                 kfree(opts);
                 return ERR_PTR(ret);
         }
+        config_group_init_type_name(&opts->func_inst.group, "",
+                                    &serial_func_type);
 
         return &opts->func_inst;
 }