1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 #ifndef _LINUX_I8042_H 3 #define _LINUX_I8042_H 4 5 6 #include <linux/errno.h> 7 #include <linux/types.h> 8 9 /* 10 * Standard commands. 11 */ 12 13 #define I8042_CMD_CTL_RCTR 0x0120 14 #define I8042_CMD_CTL_WCTR 0x1060 15 #define I8042_CMD_CTL_TEST 0x01aa 16 17 #define I8042_CMD_KBD_DISABLE 0x00ad 18 #define I8042_CMD_KBD_ENABLE 0x00ae 19 #define I8042_CMD_KBD_TEST 0x01ab 20 #define I8042_CMD_KBD_LOOP 0x11d2 21 22 #define I8042_CMD_AUX_DISABLE 0x00a7 23 #define I8042_CMD_AUX_ENABLE 0x00a8 24 #define I8042_CMD_AUX_TEST 0x01a9 25 #define I8042_CMD_AUX_SEND 0x10d4 26 #define I8042_CMD_AUX_LOOP 0x11d3 27 28 #define I8042_CMD_MUX_PFX 0x0090 29 #define I8042_CMD_MUX_SEND 0x1090 30 31 /* 32 * Status register bits. 33 */ 34 35 #define I8042_STR_PARITY 0x80 36 #define I8042_STR_TIMEOUT 0x40 37 #define I8042_STR_AUXDATA 0x20 38 #define I8042_STR_KEYLOCK 0x10 39 #define I8042_STR_CMDDAT 0x08 40 #define I8042_STR_MUXERR 0x04 41 #define I8042_STR_IBF 0x02 42 #define I8042_STR_OBF 0x01 43 44 /* 45 * Control register bits. 46 */ 47 48 #define I8042_CTR_KBDINT 0x01 49 #define I8042_CTR_AUXINT 0x02 50 #define I8042_CTR_IGNKEYLOCK 0x08 51 #define I8042_CTR_KBDDIS 0x10 52 #define I8042_CTR_AUXDIS 0x20 53 #define I8042_CTR_XLATE 0x40 54 55 struct serio; 56 57 /** 58 * typedef i8042_filter_t - i8042 filter callback 59 * @data: Data received by the i8042 controller 60 * @str: Status register of the i8042 controller 61 * @serio: Serio of the i8042 controller 62 * @context: Context pointer associated with this callback 63 * 64 * This represents a i8042 filter callback which can be used with i8042_install_filter() 65 * and i8042_remove_filter() to filter the i8042 input for platform-specific key codes. 66 * 67 * Context: Interrupt context. 68 * Returns: true if the data should be filtered out, false if otherwise. 69 */ 70 typedef bool (*i8042_filter_t)(unsigned char data, unsigned char str, struct serio *serio, 71 void *context); 72 73 #if defined(CONFIG_SERIO_I8042) || defined(CONFIG_SERIO_I8042_MODULE) 74 75 void i8042_lock_chip(void); 76 void i8042_unlock_chip(void); 77 int i8042_command(unsigned char *param, int command); 78 int i8042_install_filter(i8042_filter_t filter, void *context); 79 int i8042_remove_filter(i8042_filter_t filter); 80 81 #else 82 83 static inline void i8042_lock_chip(void) 84 { 85 } 86 87 static inline void i8042_unlock_chip(void) 88 { 89 } 90 91 static inline int i8042_command(unsigned char *param, int command) 92 { 93 return -ENODEV; 94 } 95 96 static inline int i8042_install_filter(i8042_filter_t filter, void *context) 97 { 98 return -ENODEV; 99 } 100 101 static inline int i8042_remove_filter(i8042_filter_t filter) 102 { 103 return -ENODEV; 104 } 105 106 #endif 107 108 #endif 109