linux-kernel - [PATCH 3/4] mmc: sdio: Extend sdio_config_attr macro and use it also for modalias

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Date:   Mon, 27 Jul 2020 15:38:36 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] mmc: sdio: Extend sdio_config_attr macro and use it also for modalias

This simplify code for generating sdio config attributes and allows easily
define new sdio attributes.

Signed-off-by: Pali Rohár <pali@...nel.org>
---
 drivers/mmc/core/sdio_bus.c | 20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

diff --git a/drivers/mmc/core/sdio_bus.c b/drivers/mmc/core/sdio_bus.c
index 3cc928282af7..2384829c8fb2 100644
--- a/drivers/mmc/core/sdio_bus.c
+++ b/drivers/mmc/core/sdio_bus.c
@@ -28,29 +28,21 @@
 #define to_sdio_driver(d)	container_of(d, struct sdio_driver, drv)
 
 /* show configuration fields */
-#define sdio_config_attr(field, format_string)				\
+#define sdio_config_attr(field, format_string, args...)			\
 static ssize_t								\
 field##_show(struct device *dev, struct device_attribute *attr, char *buf)				\
 {									\
 	struct sdio_func *func;						\
 									\
 	func = dev_to_sdio_func (dev);					\
-	return sprintf (buf, format_string, func->field);		\
+	return sprintf(buf, format_string, args);			\
 }									\
 static DEVICE_ATTR_RO(field)
 
-sdio_config_attr(class, "0x%02x\n");
-sdio_config_attr(vendor, "0x%04x\n");
-sdio_config_attr(device, "0x%04x\n");
-
-static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct sdio_func *func = dev_to_sdio_func (dev);
-
-	return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n",
-			func->class, func->vendor, func->device);
-}
-static DEVICE_ATTR_RO(modalias);
+sdio_config_attr(class, "0x%02x\n", func->class);
+sdio_config_attr(vendor, "0x%04x\n", func->vendor);
+sdio_config_attr(device, "0x%04x\n", func->device);
+sdio_config_attr(modalias, "sdio:c%02Xv%04Xd%04X\n", func->class, func->vendor, func->device);
 
 static struct attribute *sdio_dev_attrs[] = {
 	&dev_attr_class.attr,
-- 
2.20.1