change debug_out format of addr to JZ_FMT_plx
[qemu/qemu-JZ.git] / hw / ads7846.c
blobb39c00f51502c3e4428334e292e819666db9899a
1 /*
2 * TI ADS7846 / TSC2046 chip emulation.
4 * Copyright (c) 2006 Openedhand Ltd.
5 * Written by Andrzej Zaborowski <balrog@zabor.org>
7 * This code is licensed under the GNU GPL v2.
8 */
10 #include "hw.h"
11 #include "devices.h"
12 #include "console.h"
14 struct ads7846_state_s {
15 qemu_irq interrupt;
17 int input[8];
18 int pressure;
19 int noise;
21 int cycle;
22 int output;
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)
35 #define X_AXIS_DMAX 3470
36 #define X_AXIS_MIN 290
37 #define Y_AXIS_DMAX 3450
38 #define Y_AXIS_MIN 200
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))
49 static void ads7846_int_update(struct ads7846_state_s *s)
51 if (s->interrupt)
52 qemu_set_irq(s->interrupt, s->pressure == 0);
55 uint32_t ads7846_read(void *opaque)
57 struct ads7846_state_s *s = (struct ads7846_state_s *) opaque;
59 return s->output;
62 void ads7846_write(void *opaque, uint32_t value)
64 struct ads7846_state_s *s = (struct ads7846_state_s *) opaque;
66 switch (s->cycle ++) {
67 case 0:
68 if (!(value & CB_START)) {
69 s->cycle = 0;
70 break;
73 s->output = s->input[(value >> 4) & 7];
75 /* Imitate the ADC noise, some drivers expect this. */
76 s->noise = (s->noise + 3) & 7;
77 switch ((value >> 4) & 7) {
78 case 1: s->output += s->noise ^ 2; break;
79 case 3: s->output += s->noise ^ 0; break;
80 case 4: s->output += s->noise ^ 7; break;
81 case 5: s->output += s->noise ^ 5; break;
84 if (value & CB_MODE)
85 s->output >>= 4; /* 8 bits instead of 12 */
87 break;
88 case 1:
89 s->cycle = 0;
90 break;
94 static void ads7846_ts_event(void *opaque,
95 int x, int y, int z, int buttons_state)
97 struct ads7846_state_s *s = opaque;
99 if (buttons_state) {
100 x = 0x7fff - x;
101 s->input[1] = ADS_XPOS(x, y);
102 s->input[3] = ADS_Z1POS(x, y);
103 s->input[4] = ADS_Z2POS(x, y);
104 s->input[5] = ADS_YPOS(x, y);
107 if (s->pressure == !buttons_state) {
108 s->pressure = !!buttons_state;
110 ads7846_int_update(s);
114 static void ads7846_save(QEMUFile *f, void *opaque)
116 struct ads7846_state_s *s = (struct ads7846_state_s *) opaque;
117 int i;
119 for (i = 0; i < 8; i ++)
120 qemu_put_be32(f, s->input[i]);
121 qemu_put_be32(f, s->noise);
122 qemu_put_be32(f, s->cycle);
123 qemu_put_be32(f, s->output);
126 static int ads7846_load(QEMUFile *f, void *opaque, int version_id)
128 struct ads7846_state_s *s = (struct ads7846_state_s *) opaque;
129 int i;
131 for (i = 0; i < 8; i ++)
132 s->input[i] = qemu_get_be32(f);
133 s->noise = qemu_get_be32(f);
134 s->cycle = qemu_get_be32(f);
135 s->output = qemu_get_be32(f);
137 s->pressure = 0;
138 ads7846_int_update(s);
140 return 0;
143 struct ads7846_state_s *ads7846_init(qemu_irq penirq)
145 struct ads7846_state_s *s;
146 s = (struct ads7846_state_s *)
147 qemu_mallocz(sizeof(struct ads7846_state_s));
148 memset(s, 0, sizeof(struct ads7846_state_s));
150 s->interrupt = penirq;
152 s->input[0] = ADS_TEMP0; /* TEMP0 */
153 s->input[2] = ADS_VBAT; /* VBAT */
154 s->input[6] = ADS_VAUX; /* VAUX */
155 s->input[7] = ADS_TEMP1; /* TEMP1 */
157 /* We want absolute coordinates */
158 qemu_add_mouse_event_handler(ads7846_ts_event, s, 1,
159 "QEMU ADS7846-driven Touchscreen");
161 ads7846_int_update(s);
163 register_savevm("ads7846", -1, 0, ads7846_save, ads7846_load, s);
165 return s;