PPC: e500mc: add missing IVORs to bitmap
[qemu.git] / hw / ads7846.c
1 /*
2 * TI ADS7846 / TSC2046 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 GPL v2.
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 #include "ssi.h"
14 #include "console.h"
15
16 typedef struct {
17 SSISlave ssidev;
18 qemu_irq interrupt;
19
20 int input[8];
21 int pressure;
22 int noise;
23
24 int cycle;
25 int output;
26 } ADS7846State;
27
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
38 #define X_AXIS_DMAX 3470
39 #define X_AXIS_MIN 290
40 #define Y_AXIS_DMAX 3450
41 #define Y_AXIS_MIN 200
42
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
52 static void ads7846_int_update(ADS7846State *s)
53 {
54 if (s->interrupt)
55 qemu_set_irq(s->interrupt, s->pressure == 0);
56 }
57
58 static uint32_t ads7846_transfer(SSISlave *dev, uint32_t value)
59 {
60 ADS7846State *s = FROM_SSI_SLAVE(ADS7846State, dev);
61
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 }
88 return s->output;
89 }
90
91 static void ads7846_ts_event(void *opaque,
92 int x, int y, int z, int buttons_state)
93 {
94 ADS7846State *s = opaque;
95
96 if (buttons_state) {
97 x = 0x7fff - x;
98 s->input[1] = ADS_XPOS(x, y);
99 s->input[3] = ADS_Z1POS(x, y);
100 s->input[4] = ADS_Z2POS(x, y);
101 s->input[5] = ADS_YPOS(x, y);
102 }
103
104 if (s->pressure == !buttons_state) {
105 s->pressure = !!buttons_state;
106
107 ads7846_int_update(s);
108 }
109 }
110
111 static int ads7856_post_load(void *opaque, int version_id)
112 {
113 ADS7846State *s = opaque;
114
115 s->pressure = 0;
116 ads7846_int_update(s);
117 return 0;
118 }
119
120 static const VMStateDescription vmstate_ads7846 = {
121 .name = "ads7846",
122 .version_id = 0,
123 .minimum_version_id = 0,
124 .minimum_version_id_old = 0,
125 .post_load = ads7856_post_load,
126 .fields = (VMStateField[]) {
127 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
135 static int ads7846_init(SSISlave *dev)
136 {
137 ADS7846State *s = FROM_SSI_SLAVE(ADS7846State, dev);
138
139 qdev_init_gpio_out(&dev->qdev, &s->interrupt, 1);
140
141 s->input[0] = ADS_TEMP0; /* TEMP0 */
142 s->input[2] = ADS_VBAT; /* VBAT */
143 s->input[6] = ADS_VAUX; /* VAUX */
144 s->input[7] = ADS_TEMP1; /* TEMP1 */
145
146 /* We want absolute coordinates */
147 qemu_add_mouse_event_handler(ads7846_ts_event, s, 1,
148 "QEMU ADS7846-driven Touchscreen");
149
150 ads7846_int_update(s);
151
152 vmstate_register(NULL, -1, &vmstate_ads7846, s);
153 return 0;
154 }
155
156 static void ads7846_class_init(ObjectClass *klass, void *data)
157 {
158 SSISlaveClass *k = SSI_SLAVE_CLASS(klass);
159
160 k->init = ads7846_init;
161 k->transfer = ads7846_transfer;
162 }
163
164 static DeviceInfo ads7846_info = {
165 .name = "ads7846",
166 .size = sizeof(ADS7846State),
167 .class_init = ads7846_class_init,
168 };
169
170 static void ads7846_register_devices(void)
171 {
172 ssi_register_slave(&ads7846_info);
173 }
174
175 device_init(ads7846_register_devices)