dm: stdio: Plumb in the new keyboard uclass

When driver model is used for keyboards we must scan the available keyboards
and register them with stdio. Add code to do this.

At some point (once LCD/video is converted) we should be able to convert
stdio to driver model and avoid these dual data structures.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

common/stdio.c

@@ -11,6 +11,7 @@
 
 #include <config.h>
 #include <common.h>
+#include <dm.h>
 #include <errno.h>
 #include <stdarg.h>
 #include <malloc.h>
@@ -24,6 +25,8 @@
 #include <i2c.h>
 #endif
 
+#include <dm/device-internal.h>
+
 DECLARE_GLOBAL_DATA_PTR;
 
 static struct stdio_dev devs;
@@ -245,6 +248,32 @@ int stdio_init_tables(void)
 
 int stdio_add_devices(void)
 {
+#ifdef CONFIG_DM_KEYBOARD
+	struct udevice *dev;
+	struct uclass *uc;
+	int ret;
+
+	/*
+	 * For now we probe all the devices here. At some point this should be
+	 * done only when the devices are required - e.g. we have a list of
+	 * input devices to start up in the stdin environment variable. That
+	 * work probably makes more sense when stdio itself is converted to
+	 * driver model.
+	 *
+	 * TODO(sjg@chromium.org): Convert changing uclass_first_device() etc.
+	 * to return the device even on error. Then we could use that here.
+	 */
+	ret = uclass_get(UCLASS_KEYBOARD, &uc);
+	if (ret)
+		return ret;
+
+	/* Don't report errors to the caller - assume that they are non-fatal */
+	uclass_foreach_dev(dev, uc) {
+		ret = device_probe(dev);
+		if (ret)
+			printf("Failed to probe keyboard '%s'\n", dev->name);
+	}
+#endif
 #ifdef CONFIG_SYS_I2C
 	i2c_init_all();
 #else
@@ -258,7 +287,7 @@ int stdio_add_devices(void)
 #if defined(CONFIG_VIDEO) || defined(CONFIG_CFB_CONSOLE)
 	drv_video_init ();
 #endif
-#ifdef CONFIG_KEYBOARD
+#if defined(CONFIG_KEYBOARD) && !defined(CONFIG_DM_KEYBOARD)
 	drv_keyboard_init ();
 #endif
 #ifdef CONFIG_LOGBUFFER