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balrogfd5a3b32007-04-30 02:12:42 +00001/*
balrog87283512007-11-13 22:52:54 +00002 * TI ADS7846 / TSC2046 chip emulation.
balrogfd5a3b32007-04-30 02:12:42 +00003 *
4 * Copyright (c) 2006 Openedhand Ltd.
5 * Written by Andrzej Zaborowski <balrog@zabor.org>
6 *
7 * This code is licensed under the GNU GPL v2.
Paolo Bonzini6b620ca2012-01-13 17:44:23 +01008 *
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.
balrogfd5a3b32007-04-30 02:12:42 +000011 */
12
Paolo Bonzini83c9f4c2013-02-04 15:40:22 +010013#include "hw/ssi.h"
Paolo Bonzini28ecbae2012-11-28 12:06:30 +010014#include "ui/console.h"
balrogfd5a3b32007-04-30 02:12:42 +000015
Paul Brooka984a692009-05-14 22:35:09 +010016typedef struct {
17 SSISlave ssidev;
balrogfd5a3b32007-04-30 02:12:42 +000018 qemu_irq interrupt;
19
20 int input[8];
21 int pressure;
22 int noise;
23
24 int cycle;
25 int output;
Paul Brooka984a692009-05-14 22:35:09 +010026} ADS7846State;
balrogfd5a3b32007-04-30 02:12:42 +000027
28/* Control-byte bitfields */
29#define CB_PD0 (1 << 0)
30#define CB_PD1 (1 << 1)
31#define CB_SER (1 << 2)
32#define CB_MODE (1 << 3)
33#define CB_A0 (1 << 4)
34#define CB_A1 (1 << 5)
35#define CB_A2 (1 << 6)
36#define CB_START (1 << 7)
37
balrog611d7182007-06-24 13:45:36 +000038#define X_AXIS_DMAX 3470
39#define X_AXIS_MIN 290
40#define Y_AXIS_DMAX 3450
41#define Y_AXIS_MIN 200
balrogfd5a3b32007-04-30 02:12:42 +000042
43#define ADS_VBAT 2000
44#define ADS_VAUX 2000
45#define ADS_TEMP0 2000
46#define ADS_TEMP1 3000
47#define ADS_XPOS(x, y) (X_AXIS_MIN + ((X_AXIS_DMAX * (x)) >> 15))
48#define ADS_YPOS(x, y) (Y_AXIS_MIN + ((Y_AXIS_DMAX * (y)) >> 15))
49#define ADS_Z1POS(x, y) 600
50#define ADS_Z2POS(x, y) (600 + 6000 / ADS_XPOS(x, y))
51
Paul Brookbc24a222009-05-10 01:44:56 +010052static void ads7846_int_update(ADS7846State *s)
balrogfd5a3b32007-04-30 02:12:42 +000053{
54 if (s->interrupt)
55 qemu_set_irq(s->interrupt, s->pressure == 0);
56}
57
Paul Brooka984a692009-05-14 22:35:09 +010058static uint32_t ads7846_transfer(SSISlave *dev, uint32_t value)
balrogfd5a3b32007-04-30 02:12:42 +000059{
Paul Brooka984a692009-05-14 22:35:09 +010060 ADS7846State *s = FROM_SSI_SLAVE(ADS7846State, dev);
balrogfd5a3b32007-04-30 02:12:42 +000061
62 switch (s->cycle ++) {
63 case 0:
64 if (!(value & CB_START)) {
65 s->cycle = 0;
66 break;
67 }
68
69 s->output = s->input[(value >> 4) & 7];
70
71 /* Imitate the ADC noise, some drivers expect this. */
72 s->noise = (s->noise + 3) & 7;
73 switch ((value >> 4) & 7) {
74 case 1: s->output += s->noise ^ 2; break;
75 case 3: s->output += s->noise ^ 0; break;
76 case 4: s->output += s->noise ^ 7; break;
77 case 5: s->output += s->noise ^ 5; break;
78 }
79
80 if (value & CB_MODE)
81 s->output >>= 4; /* 8 bits instead of 12 */
82
83 break;
84 case 1:
85 s->cycle = 0;
86 break;
87 }
Paul Brooka984a692009-05-14 22:35:09 +010088 return s->output;
balrogfd5a3b32007-04-30 02:12:42 +000089}
90
91static void ads7846_ts_event(void *opaque,
92 int x, int y, int z, int buttons_state)
93{
Paul Brookbc24a222009-05-10 01:44:56 +010094 ADS7846State *s = opaque;
balrogfd5a3b32007-04-30 02:12:42 +000095
96 if (buttons_state) {
balrog611d7182007-06-24 13:45:36 +000097 x = 0x7fff - x;
98 s->input[1] = ADS_XPOS(x, y);
balrogfd5a3b32007-04-30 02:12:42 +000099 s->input[3] = ADS_Z1POS(x, y);
100 s->input[4] = ADS_Z2POS(x, y);
balrog611d7182007-06-24 13:45:36 +0000101 s->input[5] = ADS_YPOS(x, y);
balrogfd5a3b32007-04-30 02:12:42 +0000102 }
103
104 if (s->pressure == !buttons_state) {
105 s->pressure = !!buttons_state;
106
balrogaa941b92007-05-24 18:50:09 +0000107 ads7846_int_update(s);
balrogfd5a3b32007-04-30 02:12:42 +0000108 }
109}
110
Juan Quintelaaefe2122010-12-01 22:03:06 +0100111static int ads7856_post_load(void *opaque, int version_id)
balrogaa941b92007-05-24 18:50:09 +0000112{
Juan Quintelaaefe2122010-12-01 22:03:06 +0100113 ADS7846State *s = opaque;
balrogaa941b92007-05-24 18:50:09 +0000114
115 s->pressure = 0;
116 ads7846_int_update(s);
balrogaa941b92007-05-24 18:50:09 +0000117 return 0;
118}
119
Juan Quintelaaefe2122010-12-01 22:03:06 +0100120static const VMStateDescription vmstate_ads7846 = {
121 .name = "ads7846",
Peter A. G. Crosthwaite66530952012-07-24 12:23:22 +1000122 .version_id = 1,
123 .minimum_version_id = 1,
Juan Quintelaaefe2122010-12-01 22:03:06 +0100124 .post_load = ads7856_post_load,
Juan Quintela8f1e8842014-05-13 16:09:35 +0100125 .fields = (VMStateField[]) {
Peter A. G. Crosthwaite66530952012-07-24 12:23:22 +1000126 VMSTATE_SSI_SLAVE(ssidev, ADS7846State),
Juan Quintelaaefe2122010-12-01 22:03:06 +0100127 VMSTATE_INT32_ARRAY(input, ADS7846State, 8),
128 VMSTATE_INT32(noise, ADS7846State),
129 VMSTATE_INT32(cycle, ADS7846State),
130 VMSTATE_INT32(output, ADS7846State),
131 VMSTATE_END_OF_LIST()
132 }
133};
134
Peter Crosthwaite1a7d9ee2014-02-11 16:27:50 -0800135static int ads7846_init(SSISlave *d)
balrogfd5a3b32007-04-30 02:12:42 +0000136{
Peter Crosthwaite1a7d9ee2014-02-11 16:27:50 -0800137 DeviceState *dev = DEVICE(d);
138 ADS7846State *s = FROM_SSI_SLAVE(ADS7846State, d);
balrogfd5a3b32007-04-30 02:12:42 +0000139
Peter Crosthwaite1a7d9ee2014-02-11 16:27:50 -0800140 qdev_init_gpio_out(dev, &s->interrupt, 1);
balrogfd5a3b32007-04-30 02:12:42 +0000141
142 s->input[0] = ADS_TEMP0; /* TEMP0 */
143 s->input[2] = ADS_VBAT; /* VBAT */
144 s->input[6] = ADS_VAUX; /* VAUX */
145 s->input[7] = ADS_TEMP1; /* TEMP1 */
146
147 /* We want absolute coordinates */
148 qemu_add_mouse_event_handler(ads7846_ts_event, s, 1,
149 "QEMU ADS7846-driven Touchscreen");
150
151 ads7846_int_update(s);
balrogaa941b92007-05-24 18:50:09 +0000152
Juan Quintelaaefe2122010-12-01 22:03:06 +0100153 vmstate_register(NULL, -1, &vmstate_ads7846, s);
Gerd Hoffmann81a322d2009-08-14 10:36:05 +0200154 return 0;
balrogfd5a3b32007-04-30 02:12:42 +0000155}
Paul Brooka984a692009-05-14 22:35:09 +0100156
Anthony Liguoricd6c4cf2011-12-16 13:36:39 -0600157static void ads7846_class_init(ObjectClass *klass, void *data)
158{
159 SSISlaveClass *k = SSI_SLAVE_CLASS(klass);
160
161 k->init = ads7846_init;
162 k->transfer = ads7846_transfer;
163}
164
Andreas Färber8c43a6f2013-01-10 16:19:07 +0100165static const TypeInfo ads7846_info = {
Anthony Liguori39bffca2011-12-07 21:34:16 -0600166 .name = "ads7846",
167 .parent = TYPE_SSI_SLAVE,
168 .instance_size = sizeof(ADS7846State),
169 .class_init = ads7846_class_init,
Paul Brooka984a692009-05-14 22:35:09 +0100170};
171
Andreas Färber83f7d432012-02-09 15:20:55 +0100172static void ads7846_register_types(void)
Paul Brooka984a692009-05-14 22:35:09 +0100173{
Anthony Liguori39bffca2011-12-07 21:34:16 -0600174 type_register_static(&ads7846_info);
Paul Brooka984a692009-05-14 22:35:09 +0100175}
176
Andreas Färber83f7d432012-02-09 15:20:55 +0100177type_init(ads7846_register_types)