drivers/input/serio/i8042-io.h

   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 #ifdef __alpha__
  19 # define I8042_KBD_IRQ  1
  20 # define I8042_AUX_IRQ  (RTC_PORT(0) == 0x170 ? 9 : 12) /* Jensen is special */
  21 #elif defined(__arm__)
  22 /* defined in include/asm-arm/arch-xxx/irqs.h */
  23 #include <asm/irq.h>
  24 #elif defined(CONFIG_PPC)
  25 extern int of_i8042_kbd_irq;
  26 extern int of_i8042_aux_irq;
  27 # define I8042_KBD_IRQ  of_i8042_kbd_irq
  28 # define I8042_AUX_IRQ  of_i8042_aux_irq
  29 #else
  30 # define I8042_KBD_IRQ  1
  31 # define I8042_AUX_IRQ  12
  32 #endif
  33
  34
  35 /*
  36  * Register numbers.
  37  */
  38
  39 #define I8042_COMMAND_REG       0x64
  40 #define I8042_STATUS_REG        0x64
  41 #define I8042_DATA_REG          0x60
  42
  43 static inline int i8042_read_data(void)
  44 {
  45         return inb(I8042_DATA_REG);
  46 }
  47
  48 static inline int i8042_read_status(void)
  49 {
  50         return inb(I8042_STATUS_REG);
  51 }
  52
  53 static inline void i8042_write_data(int val)
  54 {
  55         outb(val, I8042_DATA_REG);
  56 }
  57
  58 static inline void i8042_write_command(int val)
  59 {
  60         outb(val, I8042_COMMAND_REG);
  61 }
  62
  63 static inline int i8042_platform_init(void)
  64 {
  65 /*
  66  * On some platforms touching the i8042 data register region can do really
  67  * bad things. Because of this the region is always reserved on such boxes.
  68  */
  69 #if defined(CONFIG_PPC)
  70         if (check_legacy_ioport(I8042_DATA_REG))
  71                 return -ENODEV;
  72 #endif
  73 #if !defined(__sh__) && !defined(__alpha__)
  74         if (!request_region(I8042_DATA_REG, 16, "i8042"))
  75                 return -EBUSY;
  76 #endif
  77
  78         i8042_reset = I8042_RESET_ALWAYS;
  79         return 0;
  80 }
  81
  82 static inline void i8042_platform_exit(void)
  83 {
  84 #if !defined(__sh__) && !defined(__alpha__)
  85         release_region(I8042_DATA_REG, 16);
  86 #endif
  87 }
  88
  89 #endif /* _I8042_IO_H */