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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.
8: */
9:
1.1.1.3 root 10: #include "ssi.h"
1.1 root 11: #include "console.h"
12:
1.1.1.3 root 13: typedef struct {
14: SSISlave ssidev;
1.1 root 15: qemu_irq interrupt;
16:
17: int input[8];
18: int pressure;
19: int noise;
20:
21: int cycle;
22: int output;
1.1.1.3 root 23: } ADS7846State;
1.1 root 24:
25: /* Control-byte bitfields */
26: #define CB_PD0 (1 << 0)
27: #define CB_PD1 (1 << 1)
28: #define CB_SER (1 << 2)
29: #define CB_MODE (1 << 3)
30: #define CB_A0 (1 << 4)
31: #define CB_A1 (1 << 5)
32: #define CB_A2 (1 << 6)
33: #define CB_START (1 << 7)
34:
35: #define X_AXIS_DMAX 3470
36: #define X_AXIS_MIN 290
37: #define Y_AXIS_DMAX 3450
38: #define Y_AXIS_MIN 200
39:
40: #define ADS_VBAT 2000
41: #define ADS_VAUX 2000
42: #define ADS_TEMP0 2000
43: #define ADS_TEMP1 3000
44: #define ADS_XPOS(x, y) (X_AXIS_MIN + ((X_AXIS_DMAX * (x)) >> 15))
45: #define ADS_YPOS(x, y) (Y_AXIS_MIN + ((Y_AXIS_DMAX * (y)) >> 15))
46: #define ADS_Z1POS(x, y) 600
47: #define ADS_Z2POS(x, y) (600 + 6000 / ADS_XPOS(x, y))
48:
1.1.1.3 root 49: static void ads7846_int_update(ADS7846State *s)
1.1 root 50: {
51: if (s->interrupt)
52: qemu_set_irq(s->interrupt, s->pressure == 0);
53: }
54:
1.1.1.3 root 55: static uint32_t ads7846_transfer(SSISlave *dev, uint32_t value)
1.1 root 56: {
1.1.1.3 root 57: ADS7846State *s = FROM_SSI_SLAVE(ADS7846State, dev);
1.1 root 58:
59: switch (s->cycle ++) {
60: case 0:
61: if (!(value & CB_START)) {
62: s->cycle = 0;
63: break;
64: }
65:
66: s->output = s->input[(value >> 4) & 7];
67:
68: /* Imitate the ADC noise, some drivers expect this. */
69: s->noise = (s->noise + 3) & 7;
70: switch ((value >> 4) & 7) {
71: case 1: s->output += s->noise ^ 2; break;
72: case 3: s->output += s->noise ^ 0; break;
73: case 4: s->output += s->noise ^ 7; break;
74: case 5: s->output += s->noise ^ 5; break;
75: }
76:
77: if (value & CB_MODE)
78: s->output >>= 4; /* 8 bits instead of 12 */
79:
80: break;
81: case 1:
82: s->cycle = 0;
83: break;
84: }
1.1.1.3 root 85: return s->output;
1.1 root 86: }
87:
88: static void ads7846_ts_event(void *opaque,
89: int x, int y, int z, int buttons_state)
90: {
1.1.1.3 root 91: ADS7846State *s = opaque;
1.1 root 92:
93: if (buttons_state) {
94: x = 0x7fff - x;
95: s->input[1] = ADS_XPOS(x, y);
96: s->input[3] = ADS_Z1POS(x, y);
97: s->input[4] = ADS_Z2POS(x, y);
98: s->input[5] = ADS_YPOS(x, y);
99: }
100:
101: if (s->pressure == !buttons_state) {
102: s->pressure = !!buttons_state;
103:
104: ads7846_int_update(s);
105: }
106: }
107:
1.1.1.6 ! root 108: static int ads7856_post_load(void *opaque, int version_id)
1.1 root 109: {
1.1.1.6 ! root 110: ADS7846State *s = opaque;
1.1 root 111:
112: s->pressure = 0;
113: ads7846_int_update(s);
114: return 0;
115: }
116:
1.1.1.6 ! root 117: static const VMStateDescription vmstate_ads7846 = {
! 118: .name = "ads7846",
! 119: .version_id = 0,
! 120: .minimum_version_id = 0,
! 121: .minimum_version_id_old = 0,
! 122: .post_load = ads7856_post_load,
! 123: .fields = (VMStateField[]) {
! 124: VMSTATE_INT32_ARRAY(input, ADS7846State, 8),
! 125: VMSTATE_INT32(noise, ADS7846State),
! 126: VMSTATE_INT32(cycle, ADS7846State),
! 127: VMSTATE_INT32(output, ADS7846State),
! 128: VMSTATE_END_OF_LIST()
! 129: }
! 130: };
! 131:
1.1.1.4 root 132: static int ads7846_init(SSISlave *dev)
1.1 root 133: {
1.1.1.3 root 134: ADS7846State *s = FROM_SSI_SLAVE(ADS7846State, dev);
1.1 root 135:
1.1.1.3 root 136: qdev_init_gpio_out(&dev->qdev, &s->interrupt, 1);
1.1 root 137:
138: s->input[0] = ADS_TEMP0; /* TEMP0 */
139: s->input[2] = ADS_VBAT; /* VBAT */
140: s->input[6] = ADS_VAUX; /* VAUX */
141: s->input[7] = ADS_TEMP1; /* TEMP1 */
142:
143: /* We want absolute coordinates */
144: qemu_add_mouse_event_handler(ads7846_ts_event, s, 1,
145: "QEMU ADS7846-driven Touchscreen");
146:
147: ads7846_int_update(s);
148:
1.1.1.6 ! root 149: vmstate_register(NULL, -1, &vmstate_ads7846, s);
1.1.1.4 root 150: return 0;
1.1.1.3 root 151: }
152:
153: static SSISlaveInfo ads7846_info = {
154: .qdev.name ="ads7846",
155: .qdev.size = sizeof(ADS7846State),
156: .init = ads7846_init,
157: .transfer = ads7846_transfer
158: };
1.1 root 159:
1.1.1.3 root 160: static void ads7846_register_devices(void)
161: {
162: ssi_register_slave(&ads7846_info);
1.1 root 163: }
1.1.1.3 root 164:
165: device_init(ads7846_register_devices)
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