[PATCH 3/8] device: make singular devices possible

[Sascha Hauer <s.hauer@pengutronix.de>]

Currently all devices have an id meaning that all devicenames
end with a number. This patch adds a DEVICE_ID_SINGLE to make
it ppossible to register a device without an id assigned to
it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/base/driver.c |    7 +++++--
 include/driver.h      |    5 +++++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index a2674d6..2d206f9 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -103,7 +103,7 @@ int register_device(struct device_d *new_device)
 {
 	struct driver_d *drv;
 
-	if (new_device->id < 0) {
+	if (new_device->id == DEVICE_ID_DYNAMIC) {
 		new_device->id = get_free_deviceid(new_device->name);
 	} else {
 		if (get_device_by_name_id(new_device->name, new_device->id)) {
@@ -302,7 +302,10 @@ const char *dev_id(const struct device_d *dev)
 {
 	static char buf[MAX_DRIVER_NAME + 16];
 
-	snprintf(buf, sizeof(buf), FORMAT_DRIVER_NAME_ID, dev->name, dev->id);
+	if (dev->id != DEVICE_ID_SINGLE)
+		snprintf(buf, sizeof(buf), FORMAT_DRIVER_NAME_ID, dev->name, dev->id);
+	else
+		snprintf(buf, sizeof(buf), "%s", dev->name);
 
 	return buf;
 }
diff --git a/include/driver.h b/include/driver.h
index 3762027..4efa964 100644
--- a/include/driver.h
+++ b/include/driver.h
@@ -126,6 +126,11 @@ struct driver_d {
 #define RW_SIZE(x)      (x)
 #define RW_SIZE_MASK    0x7
 
+/* dynamically assign the next free id */
+#define DEVICE_ID_DYNAMIC	-1
+/* do not use an id (only one device available */
+#define DEVICE_ID_SINGLE	-2
+
 /* Register devices and drivers.
  */
 int register_driver(struct driver_d *);
-- 
1.7.10


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