Add generation of ANSI 3.64 escape sequences.

This adds support for generation of ANSI 3.64 escape sequences to the
PS/2 keyboard driver.

This change significantly refactors the code:

o	It adds an FSA to support 0xE0 and 0xE1 multibyte PS/2
	scan code sequences.

o	It converts the PS/2 scan codes to USB scan code values
	to facilitate sharing upper level code in future changes.
	Reasons to use USB scan codes:

	o	Standard
	o	Simple conversion to ASCII / ANSI 3.64
	o	Ability to share complex processing / state code
	o	Shared international keymaps in higher level code

o	It adds an ANSI 3.64 escape sequence generator for USB
	special keys; the intent of doing this is to allow the
	transparent use of PS/2, USB, and network or serial
	devices using the same upper level u-boot clients.

o	It adds an input FIFO which is an almost verbatim copy
	of the Tegra matrix keyboard driver; future changes are
	expected to share the FIFOcode among all keyboard drivers.

International keyboard support is expected to be handled at a higher
layer in the future, using a much smaller NRCS (National Replacement
Character Set) table instead of a duplicat table.

Combined, the changes reduce the overall source file size by about
5K, and removes about 4K from the data segment as well.

Note: Use of typedef for FSA states allows compiler to prohibit
switch statement without default case from omitting states.

BUG=chrome-os-partner:6580
TEST=Removed backslash from generated 3.64 sequences, stopped boot at
command line, verified character sequence generation.
Signed-off-by: tlambert@chromium.org

Change-Id: I00200c5ccefd44679335fb643b21794e5d77663a

	modified:   drivers/input/i8042.c
	modified:   include/i8042.h

Change-Id: I22c692f7bd65da5848908fc71c6cd7d04753f135
Reviewed-on: https://gerrit.chromium.org/gerrit/14218
Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
Reviewed-by: Gabe Black (Do Not Use) <gabeblack@google.com>
Tested-by: Terry Lambert <tlambert@chromium.org>
Commit-Ready: Terry Lambert <tlambert@chromium.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/include/i8042.h b/include/i8042.h
index 13952899bae..6f8e05af2c1 100644
--- a/include/i8042.h
+++ b/include/i8042.h
@@ -39,6 +39,35 @@
 #define I8042_STATUS_REG    (CONFIG_SYS_ISA_IO + 0x0064)    /* keyboard status read */
 #define I8042_COMMAND_REG   (CONFIG_SYS_ISA_IO + 0x0064)    /* keyboard ctrl write */
 
+/* Status register bits */
+#define I8042_STR_PARITY        0x80
+#define I8042_STR_TIMEOUT       0x40
+#define I8042_STR_AUXDATA       0x20
+#define I8042_STR_KEYLOCK       0x10
+#define I8042_STR_CMDDAT        0x08
+#define I8042_STR_MUXERR        0x04
+#define I8042_STR_IBF           0x02
+#define I8042_STR_OBF           0x01
+
+/* Command port commands (to i8042 controller) */
+#define I8042_CMD_SET_CMD_BYTE  0x60
+#define I8042_CMD_ENABLE_KBD    0xae
+
+/* Data port commands (to PS/2 device) */
+#define I8042_DATA_LED_WRITE    0xed
+#define I8042_DATA_KBD_RESET    0xff
+
+/* LED bits */
+#define I8042_LED_SCROLL_LOCK   0x01
+#define I8042_LED_NUM_LOCK      0x02
+#define I8042_LED_CAPS_LOCK     0x04
+#define I8042_LED_MASK          (I8042_LED_SCROLL_LOCK | \
+                                 I8042_LED_NUM_LOCK    | \
+                                 I8042_LED_CAPS_LOCK)
+
+
+
+
 #define KBD_US              0        /* default US layout */
 #define KBD_GER             1        /* german layout */