diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/mxc_keyb.h | 201 |
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__ */ |