xref: /openbmc/linux/drivers/input/serio/i8042-io.h (revision 9ac8d3fb)
1 #ifndef _I8042_IO_H
2 #define _I8042_IO_H
3 
4 /*
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 as published by
7  * the Free Software Foundation.
8  */
9 
10 /*
11  * Names.
12  */
13 
14 #define I8042_KBD_PHYS_DESC "isa0060/serio0"
15 #define I8042_AUX_PHYS_DESC "isa0060/serio1"
16 #define I8042_MUX_PHYS_DESC "isa0060/serio%d"
17 
18 /*
19  * IRQs.
20  */
21 
22 #ifdef __alpha__
23 # define I8042_KBD_IRQ	1
24 # define I8042_AUX_IRQ	(RTC_PORT(0) == 0x170 ? 9 : 12)	/* Jensen is special */
25 #elif defined(__arm__)
26 /* defined in include/asm-arm/arch-xxx/irqs.h */
27 #include <asm/irq.h>
28 #elif defined(CONFIG_SH_CAYMAN)
29 #include <asm/irq.h>
30 #else
31 # define I8042_KBD_IRQ	1
32 # define I8042_AUX_IRQ	12
33 #endif
34 
35 
36 /*
37  * Register numbers.
38  */
39 
40 #define I8042_COMMAND_REG	0x64
41 #define I8042_STATUS_REG	0x64
42 #define I8042_DATA_REG		0x60
43 
44 static inline int i8042_read_data(void)
45 {
46 	return inb(I8042_DATA_REG);
47 }
48 
49 static inline int i8042_read_status(void)
50 {
51 	return inb(I8042_STATUS_REG);
52 }
53 
54 static inline void i8042_write_data(int val)
55 {
56 	outb(val, I8042_DATA_REG);
57 }
58 
59 static inline void i8042_write_command(int val)
60 {
61 	outb(val, I8042_COMMAND_REG);
62 }
63 
64 static inline int i8042_platform_init(void)
65 {
66 /*
67  * On some platforms touching the i8042 data register region can do really
68  * bad things. Because of this the region is always reserved on such boxes.
69  */
70 #if defined(CONFIG_PPC)
71 	if (check_legacy_ioport(I8042_DATA_REG))
72 		return -ENODEV;
73 #endif
74 #if !defined(__sh__) && !defined(__alpha__) && !defined(__mips__)
75 	if (!request_region(I8042_DATA_REG, 16, "i8042"))
76 		return -EBUSY;
77 #endif
78 
79 	i8042_reset = 1;
80 	return 0;
81 }
82 
83 static inline void i8042_platform_exit(void)
84 {
85 #if !defined(__sh__) && !defined(__alpha__)
86 	release_region(I8042_DATA_REG, 16);
87 #endif
88 }
89 
90 #endif /* _I8042_IO_H */
91