ENGR00315499-9: ARM:iMX6SL EVK: Add keyboard support

i.MX6sl evk has keyboards on the board, so add mxc_keyb driver to
support key press checking.

Signed-off-by: Nitin Garg <nitin.garg@freescale.com>

1 files changed, 201 insertions, 0 deletions

diff --git a/include/mxc_keyb.h b/include/mxc_keyb.h
new file mode 100644
index 0000000..eba8b77
--- /dev/null
+++ b/include/mxc_keyb.h
@@ -0,0 +1,201 @@
+/*
+ * Copyright (C) 2009-2014 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/*!
+ * @defgroup keypad Keypad Driver
+ */
+
+/*!
+ * @file mxc_keyb.h
+ *
+ * @brief MXC keypad header file.
+ *
+ * @ingroup keypad
+ */
+#ifndef __MXC_KEYB_H__
+#define __MXC_KEYB_H__
+
+/*!
+ * Keypad Module Name
+ */
+#define MOD_NAME  "mxckpd"
+
+/*!
+ * Keypad irq number
+ */
+#define KPP_IRQ  MXC_INT_KPP
+
+/*!
+ * XLATE mode selection
+ */
+#define KEYPAD_XLATE        0
+
+/*!
+ * RAW mode selection
+ */
+#define KEYPAD_RAW          1
+
+/*!
+ * Maximum number of keys.
+ */
+#define MAXROW			8
+#define MAXCOL			8
+#define MXC_MAXKEY		(MAXROW * MAXCOL)
+
+/*!
+ * This define indicates break scancode for every key release. A constant
+ * of 128 is added to the key press scancode.
+ */
+#define  MXC_KEYRELEASE   128
+
+/*
+ * _reg_KPP_KPCR   _reg_KPP_KPSR _reg_KPP_KDDR _reg_KPP_KPDR
+ * Keypad Control Register Address
+ */
+#define KPCR    (KPP_BASE_ADDR + 0x00)
+
+/*
+ * Keypad Status Register Address
+ */
+#define KPSR    (KPP_BASE_ADDR + 0x02)
+
+/*
+ * Keypad Data Direction Address
+ */
+#define KDDR    (KPP_BASE_ADDR + 0x04)
+
+/*
+ * Keypad Data Register
+ */
+#define KPDR    (KPP_BASE_ADDR + 0x06)
+
+/*
+ * Key Press Interrupt Status bit
+ */
+#define KBD_STAT_KPKD        0x01
+
+/*
+ * Key Release Interrupt Status bit
+ */
+#define KBD_STAT_KPKR        0x02
+
+/*
+ * Key Depress Synchronizer Chain Status bit
+ */
+#define KBD_STAT_KDSC        0x04
+
+/*
+ * Key Release Synchronizer Status bit
+ */
+#define KBD_STAT_KRSS        0x08
+
+/*
+ * Key Depress Interrupt Enable Status bit
+ */
+#define KBD_STAT_KDIE        0x100
+
+/*
+ * Key Release Interrupt Enable
+ */
+#define KBD_STAT_KRIE        0x200
+
+/*
+ * Keypad Clock Enable
+ */
+#define KBD_STAT_KPPEN       0x400
+
+/*!
+ * Buffer size of keypad queue. Should be a power of 2.
+ */
+#define KPP_BUF_SIZE    128
+
+/*!
+ * Test whether bit is set for integer c
+ */
+#define TEST_BIT(c, n) ((c) & (0x1 << (n)))
+
+/*!
+ * Set nth bit in the integer c
+ */
+#define BITSET(c, n)   ((c) | (1 << (n)))
+
+/*!
+ * Reset nth bit in the integer c
+ */
+#define BITRESET(c, n) ((c) & ~(1 << (n)))
+
+enum KeyEvent {
+	KDepress,
+	KRelease
+};
+
+/*!
+ * This enum represents the keypad state machine to maintain debounce logic
+ * for key press/release.
+ */
+enum KeyState {
+
+	/*!
+	 * Key press state.
+	 */
+	KStateUp,
+
+	/*!
+	 * Key press debounce state.
+	 */
+	KStateFirstDown,
+
+	/*!
+	 * Key release state.
+	 */
+	KStateDown,
+
+	/*!
+	 * Key release debounce state.
+	 */
+	KStateFirstUp
+};
+
+/*!
+ * Keypad Private Data Structure
+ */
+struct keypad_priv {
+
+	/*!
+	 * Keypad state machine.
+	 */
+	enum KeyState iKeyState;
+
+	/*!
+	 * Number of rows configured in the keypad matrix
+	 */
+	unsigned long kpp_rows;
+
+	/*!
+	 * Number of Columns configured in the keypad matrix
+	 */
+	unsigned long kpp_cols;
+};
+
+/*!
+ * Keypad Data Structure
+ * */
+struct kpp_key_info {
+	enum KeyEvent evt;
+	unsigned short val;
+};
+
+int mxc_kpp_init(void);
+int mxc_kpp_getc(struct kpp_key_info **);
+
+/*!
+ * These functions are used to configure and the GPIO pins for keypad to
+ * activate and deactivate it.
+ */
+void setup_mxc_kpd(void);
+
+
+#endif				/* __MXC_KEYB_H__ */