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Commit | Line | Data |
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fd5a3b33 | 1 | /* |
87283515 | 2 | * TI ADS7846 / TSC2046 chip emulation. |
fd5a3b33 AZ |
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. | |
6b620ca3 PB |
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. | |
fd5a3b33 AZ |
11 | */ |
12 | ||
47df5154 | 13 | #include "qemu/osdep.h" |
64552b6b | 14 | #include "hw/irq.h" |
8fd06719 | 15 | #include "hw/ssi/ssi.h" |
d6454270 | 16 | #include "migration/vmstate.h" |
0b8fa32f | 17 | #include "qemu/module.h" |
28ecbaee | 18 | #include "ui/console.h" |
db1015e9 | 19 | #include "qom/object.h" |
fd5a3b33 | 20 | |
db1015e9 | 21 | struct ADS7846State { |
a984a69e | 22 | SSISlave ssidev; |
fd5a3b33 AZ |
23 | qemu_irq interrupt; |
24 | ||
25 | int input[8]; | |
26 | int pressure; | |
27 | int noise; | |
28 | ||
29 | int cycle; | |
30 | int output; | |
db1015e9 EH |
31 | }; |
32 | typedef struct ADS7846State ADS7846State; | |
fd5a3b33 | 33 | |
213f63df | 34 | #define TYPE_ADS7846 "ads7846" |
8110fa1d EH |
35 | DECLARE_INSTANCE_CHECKER(ADS7846State, ADS7846, |
36 | TYPE_ADS7846) | |
213f63df | 37 | |
fd5a3b33 AZ |
38 | /* Control-byte bitfields */ |
39 | #define CB_PD0 (1 << 0) | |
40 | #define CB_PD1 (1 << 1) | |
41 | #define CB_SER (1 << 2) | |
42 | #define CB_MODE (1 << 3) | |
43 | #define CB_A0 (1 << 4) | |
44 | #define CB_A1 (1 << 5) | |
45 | #define CB_A2 (1 << 6) | |
46 | #define CB_START (1 << 7) | |
47 | ||
611d7189 AZ |
48 | #define X_AXIS_DMAX 3470 |
49 | #define X_AXIS_MIN 290 | |
50 | #define Y_AXIS_DMAX 3450 | |
51 | #define Y_AXIS_MIN 200 | |
fd5a3b33 AZ |
52 | |
53 | #define ADS_VBAT 2000 | |
54 | #define ADS_VAUX 2000 | |
55 | #define ADS_TEMP0 2000 | |
56 | #define ADS_TEMP1 3000 | |
57 | #define ADS_XPOS(x, y) (X_AXIS_MIN + ((X_AXIS_DMAX * (x)) >> 15)) | |
58 | #define ADS_YPOS(x, y) (Y_AXIS_MIN + ((Y_AXIS_DMAX * (y)) >> 15)) | |
59 | #define ADS_Z1POS(x, y) 600 | |
60 | #define ADS_Z2POS(x, y) (600 + 6000 / ADS_XPOS(x, y)) | |
61 | ||
bc24a225 | 62 | static void ads7846_int_update(ADS7846State *s) |
fd5a3b33 AZ |
63 | { |
64 | if (s->interrupt) | |
65 | qemu_set_irq(s->interrupt, s->pressure == 0); | |
66 | } | |
67 | ||
a984a69e | 68 | static uint32_t ads7846_transfer(SSISlave *dev, uint32_t value) |
fd5a3b33 | 69 | { |
213f63df | 70 | ADS7846State *s = ADS7846(dev); |
fd5a3b33 AZ |
71 | |
72 | switch (s->cycle ++) { | |
73 | case 0: | |
74 | if (!(value & CB_START)) { | |
75 | s->cycle = 0; | |
76 | break; | |
77 | } | |
78 | ||
79 | s->output = s->input[(value >> 4) & 7]; | |
80 | ||
81 | /* Imitate the ADC noise, some drivers expect this. */ | |
82 | s->noise = (s->noise + 3) & 7; | |
83 | switch ((value >> 4) & 7) { | |
84 | case 1: s->output += s->noise ^ 2; break; | |
85 | case 3: s->output += s->noise ^ 0; break; | |
86 | case 4: s->output += s->noise ^ 7; break; | |
87 | case 5: s->output += s->noise ^ 5; break; | |
88 | } | |
89 | ||
90 | if (value & CB_MODE) | |
91 | s->output >>= 4; /* 8 bits instead of 12 */ | |
92 | ||
93 | break; | |
94 | case 1: | |
95 | s->cycle = 0; | |
96 | break; | |
97 | } | |
a984a69e | 98 | return s->output; |
fd5a3b33 AZ |
99 | } |
100 | ||
101 | static void ads7846_ts_event(void *opaque, | |
102 | int x, int y, int z, int buttons_state) | |
103 | { | |
bc24a225 | 104 | ADS7846State *s = opaque; |
fd5a3b33 AZ |
105 | |
106 | if (buttons_state) { | |
611d7189 AZ |
107 | x = 0x7fff - x; |
108 | s->input[1] = ADS_XPOS(x, y); | |
fd5a3b33 AZ |
109 | s->input[3] = ADS_Z1POS(x, y); |
110 | s->input[4] = ADS_Z2POS(x, y); | |
611d7189 | 111 | s->input[5] = ADS_YPOS(x, y); |
fd5a3b33 AZ |
112 | } |
113 | ||
114 | if (s->pressure == !buttons_state) { | |
115 | s->pressure = !!buttons_state; | |
116 | ||
aa941b94 | 117 | ads7846_int_update(s); |
fd5a3b33 AZ |
118 | } |
119 | } | |
120 | ||
aefe2129 | 121 | static int ads7856_post_load(void *opaque, int version_id) |
aa941b94 | 122 | { |
aefe2129 | 123 | ADS7846State *s = opaque; |
aa941b94 AZ |
124 | |
125 | s->pressure = 0; | |
126 | ads7846_int_update(s); | |
aa941b94 AZ |
127 | return 0; |
128 | } | |
129 | ||
aefe2129 JQ |
130 | static const VMStateDescription vmstate_ads7846 = { |
131 | .name = "ads7846", | |
66530953 PC |
132 | .version_id = 1, |
133 | .minimum_version_id = 1, | |
aefe2129 | 134 | .post_load = ads7856_post_load, |
8f1e884b | 135 | .fields = (VMStateField[]) { |
66530953 | 136 | VMSTATE_SSI_SLAVE(ssidev, ADS7846State), |
aefe2129 JQ |
137 | VMSTATE_INT32_ARRAY(input, ADS7846State, 8), |
138 | VMSTATE_INT32(noise, ADS7846State), | |
139 | VMSTATE_INT32(cycle, ADS7846State), | |
140 | VMSTATE_INT32(output, ADS7846State), | |
141 | VMSTATE_END_OF_LIST() | |
142 | } | |
143 | }; | |
144 | ||
7673bb4c | 145 | static void ads7846_realize(SSISlave *d, Error **errp) |
fd5a3b33 | 146 | { |
1a7d9ee6 | 147 | DeviceState *dev = DEVICE(d); |
213f63df | 148 | ADS7846State *s = ADS7846(d); |
fd5a3b33 | 149 | |
1a7d9ee6 | 150 | qdev_init_gpio_out(dev, &s->interrupt, 1); |
fd5a3b33 AZ |
151 | |
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 */ | |
156 | ||
157 | /* We want absolute coordinates */ | |
158 | qemu_add_mouse_event_handler(ads7846_ts_event, s, 1, | |
159 | "QEMU ADS7846-driven Touchscreen"); | |
160 | ||
161 | ads7846_int_update(s); | |
aa941b94 | 162 | |
1df2c9a2 | 163 | vmstate_register(NULL, VMSTATE_INSTANCE_ID_ANY, &vmstate_ads7846, s); |
a984a69e | 164 | } |
aa941b94 | 165 | |
cd6c4cf2 AL |
166 | static void ads7846_class_init(ObjectClass *klass, void *data) |
167 | { | |
168 | SSISlaveClass *k = SSI_SLAVE_CLASS(klass); | |
169 | ||
7673bb4c | 170 | k->realize = ads7846_realize; |
cd6c4cf2 AL |
171 | k->transfer = ads7846_transfer; |
172 | } | |
173 | ||
8c43a6f0 | 174 | static const TypeInfo ads7846_info = { |
213f63df | 175 | .name = TYPE_ADS7846, |
39bffca2 AL |
176 | .parent = TYPE_SSI_SLAVE, |
177 | .instance_size = sizeof(ADS7846State), | |
178 | .class_init = ads7846_class_init, | |
a984a69e PB |
179 | }; |
180 | ||
83f7d43a | 181 | static void ads7846_register_types(void) |
a984a69e | 182 | { |
39bffca2 | 183 | type_register_static(&ads7846_info); |
fd5a3b33 | 184 | } |
a984a69e | 185 | |
83f7d43a | 186 | type_init(ads7846_register_types) |