dm: input: Create a keyboard uclass

Add a uclass for keyboard input, mirroring the existing stdio methods.
This is enabled by a new CONFIG_DM_KEYBOARD option.

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

1 files changed, 79 insertions, 0 deletions

diff --git a/include/keyboard.h b/include/keyboard.h
index 88ae12bc0f..5216d59fb7 100644
--- a/include/keyboard.h
+++ b/include/keyboard.h
@@ -1,6 +1,84 @@
 #ifndef __KEYBOARD_H
 #define __KEYBOARD_H
 
+#ifdef CONFIG_DM_KEYBOARD
+#include <input.h>
+#include <stdio_dev.h>
+
+/**
+ * struct keyboard_priv - information about a keyboard, for the uclass
+ *
+ * @sdev:	stdio device
+ * @input:	input configuration (the driver may use this if desired)
+ */
+struct keyboard_priv {
+	struct stdio_dev sdev;
+
+	/*
+	 * This is set up by the uclass but will only be used if the driver
+	 * sets input.dev to its device pointer (it is initially NULL).
+	 */
+	struct input_config input;
+};
+
+/**
+ * struct keyboard_ops - keyboard device operations
+ */
+struct keyboard_ops {
+	/**
+	 * start() - enable the keyboard ready for use
+	 *
+	 * @dev:	Device to enable
+	 * @return 0 if OK, -ve on error
+	 */
+	int (*start)(struct udevice *dev);
+
+	/**
+	 * stop() - disable the keyboard when no-longer needed
+	 *
+	 * @dev:	Device to disable
+	 * @return 0 if OK, -ve on error
+	 */
+	int (*stop)(struct udevice *dev);
+
+	/**
+	 * tstc() - check if a key is available
+	 *
+	 * @dev:	Device to check
+	 * @return 0 if no key is available, 1 if a key is available, -ve on
+	 *	   error
+	 */
+	int (*tstc)(struct udevice *dev);
+
+	/**
+	 * getc() - get a key
+	 *
+	 * TODO(sjg@chromium.org): At present this method may wait if it calls
+	 * input_getc().
+	 *
+	 * @dev:	Device to read from
+	 * @return -EAGAIN if no key is available, otherwise key value read
+	 *	   (as ASCII).
+	 */
+	int (*getc)(struct udevice *dev);
+
+	/**
+	 * update_leds() - update keyboard LEDs
+	 *
+	 * This is called when the LEDs have changed and need to be updated.
+	 * For example, if 'caps lock' is pressed then this method will be
+	 * called with the new LED value.
+	 *
+	 * @dev:	Device to update
+	 * @leds:	New LED mask (see INPUT_LED_... in input.h)
+	 */
+	int (*update_leds)(struct udevice *dev, int leds);
+};
+
+#define keyboard_get_ops(dev)	((struct keyboard_ops *)(dev)->driver->ops)
+
+#else
+
 #ifdef CONFIG_PS2MULT
 #include <ps2mult.h>
 #endif
@@ -18,5 +96,6 @@ extern int kbd_init (void);
 extern void handle_scancode(unsigned char scancode);
 extern int kbd_init_hw(void);
 extern void pckbd_leds(unsigned char leds);
+#endif /* !CONFIG_DM_KEYBOARD */
 
 #endif /* __KEYBOARD_H */