include/hw/misc/max111x.h

   1 /*
   2  * Maxim MAX1110/1111 ADC chip emulation.
   3  *
   4  * Copyright (c) 2006 Openedhand Ltd.
   5  * Written by Andrzej Zaborowski <balrog@zabor.org>
   6  *
   7  * This code is licensed under the GNU GPLv2.
   8  *
   9  * Contributions after 2012-01-13 are licensed under the terms of the
  10  * GNU GPL, version 2 or (at your option) any later version.
  11  */
  12
  13 #ifndef HW_MISC_MAX111X_H
  14 #define HW_MISC_MAX111X_H
  15
  16 #include "hw/ssi/ssi.h"
  17
  18 /*
  19  * This is a model of the Maxim MAX1110/1111 ADC chip, which for QEMU
  20  * is an SSI slave device. It has either 4 (max1110) or 8 (max1111)
  21  * 8-bit ADC channels.
  22  *
  23  * QEMU interface:
  24  *  + GPIO inputs 0..3 (for max1110) or 0..7 (for max1111): set the value
  25  *    of each ADC input, as an unsigned 8-bit value
  26  *  + GPIO output 0: interrupt line
  27  *  + Properties "input0" to "input3" (max1110) or "input0" to "input7"
  28  *    (max1111): initial reset values for ADC inputs.
  29  *
  30  * Known bugs:
  31  *  + the interrupt line is not correctly implemented, and will never
  32  *    be lowered once it has been asserted.
  33  */
  34 typedef struct {
  35     SSISlave parent_obj;
  36
  37     qemu_irq interrupt;
  38     /* Values of inputs at system reset (settable by QOM property) */
  39     uint8_t reset_input[8];
  40
  41     uint8_t tb1, rb2, rb3;
  42     int cycle;
  43
  44     uint8_t input[8];
  45     int inputs, com;
  46 } MAX111xState;
  47
  48 #define TYPE_MAX_111X "max111x"
  49
  50 #define MAX_111X(obj) \
  51     OBJECT_CHECK(MAX111xState, (obj), TYPE_MAX_111X)
  52
  53 #define TYPE_MAX_1110 "max1110"
  54 #define TYPE_MAX_1111 "max1111"
  55
  56 #endif