1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 #ifndef _I8042_IO_H 3 #define _I8042_IO_H 4 5 6 /* 7 * Names. 8 */ 9 10 #define I8042_KBD_PHYS_DESC "isa0060/serio0" 11 #define I8042_AUX_PHYS_DESC "isa0060/serio1" 12 #define I8042_MUX_PHYS_DESC "isa0060/serio%d" 13 14 /* 15 * IRQs. 16 */ 17 18 #if defined(__arm__) 19 /* defined in include/asm-arm/arch-xxx/irqs.h */ 20 #include <asm/irq.h> 21 #elif defined(CONFIG_PPC) 22 extern int of_i8042_kbd_irq; 23 extern int of_i8042_aux_irq; 24 # define I8042_KBD_IRQ of_i8042_kbd_irq 25 # define I8042_AUX_IRQ of_i8042_aux_irq 26 #else 27 # define I8042_KBD_IRQ 1 28 # define I8042_AUX_IRQ 12 29 #endif 30 31 32 /* 33 * Register numbers. 34 */ 35 36 #define I8042_COMMAND_REG 0x64 37 #define I8042_STATUS_REG 0x64 38 #define I8042_DATA_REG 0x60 39 40 static inline int i8042_read_data(void) 41 { 42 return inb(I8042_DATA_REG); 43 } 44 45 static inline int i8042_read_status(void) 46 { 47 return inb(I8042_STATUS_REG); 48 } 49 50 static inline void i8042_write_data(int val) 51 { 52 outb(val, I8042_DATA_REG); 53 } 54 55 static inline void i8042_write_command(int val) 56 { 57 outb(val, I8042_COMMAND_REG); 58 } 59 60 static inline int i8042_platform_init(void) 61 { 62 /* 63 * On some platforms touching the i8042 data register region can do really 64 * bad things. Because of this the region is always reserved on such boxes. 65 */ 66 #if defined(CONFIG_PPC) 67 if (check_legacy_ioport(I8042_DATA_REG)) 68 return -ENODEV; 69 #endif 70 #if !defined(__sh__) && !defined(__alpha__) 71 if (!request_region(I8042_DATA_REG, 16, "i8042")) 72 return -EBUSY; 73 #endif 74 75 i8042_reset = I8042_RESET_ALWAYS; 76 return 0; 77 } 78 79 static inline void i8042_platform_exit(void) 80 { 81 #if !defined(__sh__) && !defined(__alpha__) 82 release_region(I8042_DATA_REG, 16); 83 #endif 84 } 85 86 #endif /* _I8042_IO_H */ 87