usb: add USB console driver

Provide access to the EC console through 2 USB bulk endpoints.
(which can be used through the usbserial driver)

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=none
BUG=none
TEST=run on Fruitpie and use the console over USB

Change-Id: Ia897764f3a030972ee2ed323f293c5fca899765a
Reviewed-on: https://chromium-review.googlesource.com/204167
Reviewed-by: Anton Staaf <robotboy@chromium.org>
Commit-Queue: Vic Yang <victoryang@chromium.org>
Tested-by: Vic Yang <victoryang@chromium.org>

1 files changed, 55 insertions, 0 deletions

diff --git a/include/usb_console.h b/include/usb_console.h
new file mode 100644
index 0000000000..9666fa425a
--- /dev/null
+++ b/include/usb_console.h
@@ -0,0 +1,55 @@
+/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* USB serial console module */
+
+#ifndef __USB_CONSOLE_H
+#define __USB_CONSOLE_H
+
+#ifdef CONFIG_USB_CONSOLE
+
+/**
+ * Put a null-terminated string to the USB console, like fputs().
+ *
+ * @return EC_SUCCESS, or non-zero if output was truncated.
+ */
+int usb_puts(const char *outstr);
+
+/**
+ * Print formatted output to the USB console, like vprintf().
+ *
+ * See printf.h for valid formatting codes.
+ *
+ * @return EC_SUCCESS, or non-zero if output was truncated.
+ */
+int usb_vprintf(const char *format, va_list args);
+
+/**
+ * Put a single character to the USB console, like putchar().
+ *
+ * @param c		Character to put
+ * @return EC_SUCCESS, or non-zero if output was truncated.
+ */
+int usb_putc(int c);
+
+/**
+ * Read a single character of input, similar to fgetc().
+ *
+ * @return the character, or -1 if no input waiting.
+ */
+int usb_getc(void);
+
+#define usb_va_start va_start
+#define usb_va_end va_end
+#else
+#define usb_puts(x) EC_SUCCESS
+#define usb_vprintf(x, y) EC_SUCCESS
+#define usb_putc(x) EC_SUCCESS
+#define usb_getc(x) (-1)
+#define usb_va_start(x, y)
+#define usb_va_end(x)
+#endif
+
+#endif /* __USB_CONSOLE_H */