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1.1 root 1: /*
2: * TI ADS7846 / TSC2046 chip emulation.
3: *
4: * Copyright (c) 2006 Openedhand Ltd.
5: * Written by Andrzej Zaborowski <[email protected]>
6: *
7: * This code is licensed under the GNU GPL v2.
1.1.1.7 ! root 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.
1.1 root 11: */
12:
1.1.1.3 root 13: #include "ssi.h"
1.1 root 14: #include "console.h"
15:
1.1.1.3 root 16: typedef struct {
17: SSISlave ssidev;
1.1 root 18: qemu_irq interrupt;
19:
20: int input[8];
21: int pressure;
22: int noise;
23:
24: int cycle;
25: int output;
1.1.1.3 root 26: } ADS7846State;
1.1 root 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:
1.1.1.3 root 52: static void ads7846_int_update(ADS7846State *s)
1.1 root 53: {
54: if (s->interrupt)
55: qemu_set_irq(s->interrupt, s->pressure == 0);
56: }
57:
1.1.1.3 root 58: static uint32_t ads7846_transfer(SSISlave *dev, uint32_t value)
1.1 root 59: {
1.1.1.3 root 60: ADS7846State *s = FROM_SSI_SLAVE(ADS7846State, dev);
1.1 root 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: }
1.1.1.3 root 88: return s->output;
1.1 root 89: }
90:
91: static void ads7846_ts_event(void *opaque,
92: int x, int y, int z, int buttons_state)
93: {
1.1.1.3 root 94: ADS7846State *s = opaque;
1.1 root 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:
1.1.1.6 root 111: static int ads7856_post_load(void *opaque, int version_id)
1.1 root 112: {
1.1.1.6 root 113: ADS7846State *s = opaque;
1.1 root 114:
115: s->pressure = 0;
116: ads7846_int_update(s);
117: return 0;
118: }
119:
1.1.1.6 root 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:
1.1.1.4 root 135: static int ads7846_init(SSISlave *dev)
1.1 root 136: {
1.1.1.3 root 137: ADS7846State *s = FROM_SSI_SLAVE(ADS7846State, dev);
1.1 root 138:
1.1.1.3 root 139: qdev_init_gpio_out(&dev->qdev, &s->interrupt, 1);
1.1 root 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:
1.1.1.6 root 152: vmstate_register(NULL, -1, &vmstate_ads7846, s);
1.1.1.4 root 153: return 0;
1.1.1.3 root 154: }
155:
1.1.1.7 ! root 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 TypeInfo ads7846_info = {
! 165: .name = "ads7846",
! 166: .parent = TYPE_SSI_SLAVE,
! 167: .instance_size = sizeof(ADS7846State),
! 168: .class_init = ads7846_class_init,
1.1.1.3 root 169: };
1.1 root 170:
1.1.1.7 ! root 171: static void ads7846_register_types(void)
1.1.1.3 root 172: {
1.1.1.7 ! root 173: type_register_static(&ads7846_info);
1.1 root 174: }
1.1.1.3 root 175:
1.1.1.7 ! root 176: type_init(ads7846_register_types)
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