usb-gadget/f_printer: use per-attribute show and store methods

To simplify the configfs interface and remove boilerplate code that also
causes binary bloat.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/usb/gadget/function/f_printer.c

@@ -1148,9 +1148,6 @@ static inline struct f_printer_opts
 			    func_inst.group);
 }
 
-CONFIGFS_ATTR_STRUCT(f_printer_opts);
-CONFIGFS_ATTR_OPS(f_printer_opts);
-
 static void printer_attr_release(struct config_item *item)
 {
 	struct f_printer_opts *opts = to_f_printer_opts(item);
@@ -1160,13 +1157,12 @@ static void printer_attr_release(struct config_item *item)
 
 static struct configfs_item_operations printer_item_ops = {
 	.release	= printer_attr_release,
-	.show_attribute	= f_printer_opts_attr_show,
-	.store_attribute = f_printer_opts_attr_store,
 };
 
-static ssize_t f_printer_opts_pnp_string_show(struct f_printer_opts *opts,
+static ssize_t f_printer_opts_pnp_string_show(struct config_item *item,
 					      char *page)
 {
+	struct f_printer_opts *opts = to_f_printer_opts(item);
 	int result;
 
 	mutex_lock(&opts->lock);
@@ -1176,9 +1172,10 @@ static ssize_t f_printer_opts_pnp_string_show(struct f_printer_opts *opts,
 	return result;
 }
 
-static ssize_t f_printer_opts_pnp_string_store(struct f_printer_opts *opts,
+static ssize_t f_printer_opts_pnp_string_store(struct config_item *item,
 					       const char *page, size_t len)
 {
+	struct f_printer_opts *opts = to_f_printer_opts(item);
 	int result, l;
 
 	mutex_lock(&opts->lock);
@@ -1191,14 +1188,12 @@ static ssize_t f_printer_opts_pnp_string_store(struct f_printer_opts *opts,
 	return result;
 }
 
-static struct f_printer_opts_attribute f_printer_opts_pnp_string =
-	__CONFIGFS_ATTR(pnp_string, S_IRUGO | S_IWUSR,
-			f_printer_opts_pnp_string_show,
-			f_printer_opts_pnp_string_store);
+CONFIGFS_ATTR(f_printer_opts_, pnp_string);
 
-static ssize_t f_printer_opts_q_len_show(struct f_printer_opts *opts,
+static ssize_t f_printer_opts_q_len_show(struct config_item *item,
 					 char *page)
 {
+	struct f_printer_opts *opts = to_f_printer_opts(item);
 	int result;
 
 	mutex_lock(&opts->lock);
@@ -1208,9 +1203,10 @@ static ssize_t f_printer_opts_q_len_show(struct f_printer_opts *opts,
 	return result;
 }
 
-static ssize_t f_printer_opts_q_len_store(struct f_printer_opts *opts,
+static ssize_t f_printer_opts_q_len_store(struct config_item *item,
 					  const char *page, size_t len)
 {
+	struct f_printer_opts *opts = to_f_printer_opts(item);
 	int ret;
 	u16 num;
 
@@ -1231,13 +1227,11 @@ static ssize_t f_printer_opts_q_len_store(struct f_printer_opts *opts,
 	return ret;
 }
 
-static struct f_printer_opts_attribute f_printer_opts_q_len =
-	__CONFIGFS_ATTR(q_len, S_IRUGO | S_IWUSR, f_printer_opts_q_len_show,
-			f_printer_opts_q_len_store);
+CONFIGFS_ATTR(f_printer_opts_, q_len);
 
 static struct configfs_attribute *printer_attrs[] = {
-	&f_printer_opts_pnp_string.attr,
-	&f_printer_opts_q_len.attr,
+	&f_printer_opts_attr_pnp_string,
+	&f_printer_opts_attr_q_len,
 	NULL,
 };