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-rw-r--r--include/mxc_keyb.h201
1 files changed, 201 insertions, 0 deletions
diff --git a/include/mxc_keyb.h b/include/mxc_keyb.h
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+/*
+ * 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__ */