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a643bd77 LW |
1 | /* |
2 | * Silicon Image SiI9022 | |
3 | * | |
4 | * This is a pretty hollow emulation: all we do is acknowledge that we | |
5 | * exist (chip ID) and confirm that we get switched over into DDC mode | |
6 | * so the emulated host can proceed to read out EDID data. All subsequent | |
7 | * set-up of connectors etc will be acknowledged and ignored. | |
8 | * | |
9 | * Copyright (C) 2018 Linus Walleij | |
10 | * | |
11 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
12 | * See the COPYING file in the top-level directory. | |
13 | * SPDX-License-Identifier: GPL-2.0-or-later | |
14 | */ | |
15 | ||
16 | #include "qemu/osdep.h" | |
0b8fa32f | 17 | #include "qemu/module.h" |
a643bd77 | 18 | #include "hw/i2c/i2c.h" |
d6454270 | 19 | #include "migration/vmstate.h" |
6306cae2 | 20 | #include "hw/display/i2c-ddc.h" |
a643bd77 | 21 | #include "trace.h" |
db1015e9 | 22 | #include "qom/object.h" |
a643bd77 LW |
23 | |
24 | #define SII9022_SYS_CTRL_DATA 0x1a | |
25 | #define SII9022_SYS_CTRL_PWR_DWN 0x10 | |
26 | #define SII9022_SYS_CTRL_AV_MUTE 0x08 | |
27 | #define SII9022_SYS_CTRL_DDC_BUS_REQ 0x04 | |
28 | #define SII9022_SYS_CTRL_DDC_BUS_GRTD 0x02 | |
29 | #define SII9022_SYS_CTRL_OUTPUT_MODE 0x01 | |
30 | #define SII9022_SYS_CTRL_OUTPUT_HDMI 1 | |
31 | #define SII9022_SYS_CTRL_OUTPUT_DVI 0 | |
32 | #define SII9022_REG_CHIPID 0x1b | |
33 | #define SII9022_INT_ENABLE 0x3c | |
34 | #define SII9022_INT_STATUS 0x3d | |
35 | #define SII9022_INT_STATUS_HOTPLUG 0x01; | |
36 | #define SII9022_INT_STATUS_PLUGGED 0x04; | |
37 | ||
38 | #define TYPE_SII9022 "sii9022" | |
db1015e9 | 39 | typedef struct sii9022_state sii9022_state; |
8110fa1d EH |
40 | DECLARE_INSTANCE_CHECKER(sii9022_state, SII9022, |
41 | TYPE_SII9022) | |
a643bd77 | 42 | |
db1015e9 | 43 | struct sii9022_state { |
a643bd77 LW |
44 | I2CSlave parent_obj; |
45 | uint8_t ptr; | |
46 | bool addr_byte; | |
47 | bool ddc_req; | |
48 | bool ddc_skip_finish; | |
49 | bool ddc; | |
db1015e9 | 50 | }; |
a643bd77 LW |
51 | |
52 | static const VMStateDescription vmstate_sii9022 = { | |
53 | .name = "sii9022", | |
54 | .version_id = 1, | |
55 | .minimum_version_id = 1, | |
56 | .fields = (VMStateField[]) { | |
57 | VMSTATE_I2C_SLAVE(parent_obj, sii9022_state), | |
58 | VMSTATE_UINT8(ptr, sii9022_state), | |
59 | VMSTATE_BOOL(addr_byte, sii9022_state), | |
60 | VMSTATE_BOOL(ddc_req, sii9022_state), | |
61 | VMSTATE_BOOL(ddc_skip_finish, sii9022_state), | |
62 | VMSTATE_BOOL(ddc, sii9022_state), | |
63 | VMSTATE_END_OF_LIST() | |
64 | } | |
65 | }; | |
66 | ||
67 | static int sii9022_event(I2CSlave *i2c, enum i2c_event event) | |
68 | { | |
69 | sii9022_state *s = SII9022(i2c); | |
70 | ||
71 | switch (event) { | |
72 | case I2C_START_SEND: | |
73 | s->addr_byte = true; | |
74 | break; | |
75 | case I2C_START_RECV: | |
76 | break; | |
77 | case I2C_FINISH: | |
78 | break; | |
79 | case I2C_NACK: | |
80 | break; | |
81 | } | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
2ac4c5f4 | 86 | static uint8_t sii9022_rx(I2CSlave *i2c) |
a643bd77 LW |
87 | { |
88 | sii9022_state *s = SII9022(i2c); | |
89 | uint8_t res = 0x00; | |
90 | ||
91 | switch (s->ptr) { | |
92 | case SII9022_SYS_CTRL_DATA: | |
93 | if (s->ddc_req) { | |
94 | /* Acknowledge DDC bus request */ | |
95 | res = SII9022_SYS_CTRL_DDC_BUS_GRTD | SII9022_SYS_CTRL_DDC_BUS_REQ; | |
96 | } | |
97 | break; | |
98 | case SII9022_REG_CHIPID: | |
99 | res = 0xb0; | |
100 | break; | |
101 | case SII9022_INT_STATUS: | |
102 | /* Something is cold-plugged in, no interrupts */ | |
103 | res = SII9022_INT_STATUS_PLUGGED; | |
104 | break; | |
105 | default: | |
106 | break; | |
107 | } | |
108 | ||
109 | trace_sii9022_read_reg(s->ptr, res); | |
110 | s->ptr++; | |
111 | ||
112 | return res; | |
113 | } | |
114 | ||
115 | static int sii9022_tx(I2CSlave *i2c, uint8_t data) | |
116 | { | |
117 | sii9022_state *s = SII9022(i2c); | |
118 | ||
119 | if (s->addr_byte) { | |
120 | s->ptr = data; | |
121 | s->addr_byte = false; | |
122 | return 0; | |
123 | } | |
124 | ||
125 | switch (s->ptr) { | |
126 | case SII9022_SYS_CTRL_DATA: | |
127 | if (data & SII9022_SYS_CTRL_DDC_BUS_REQ) { | |
128 | s->ddc_req = true; | |
129 | if (data & SII9022_SYS_CTRL_DDC_BUS_GRTD) { | |
130 | s->ddc = true; | |
131 | /* Skip this finish since we just switched to DDC */ | |
132 | s->ddc_skip_finish = true; | |
133 | trace_sii9022_switch_mode("DDC"); | |
134 | } | |
135 | } else { | |
136 | s->ddc_req = false; | |
137 | s->ddc = false; | |
138 | trace_sii9022_switch_mode("normal"); | |
139 | } | |
140 | break; | |
141 | default: | |
142 | break; | |
143 | } | |
144 | ||
145 | trace_sii9022_write_reg(s->ptr, data); | |
146 | s->ptr++; | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
151 | static void sii9022_reset(DeviceState *dev) | |
152 | { | |
153 | sii9022_state *s = SII9022(dev); | |
154 | ||
155 | s->ptr = 0; | |
156 | s->addr_byte = false; | |
157 | s->ddc_req = false; | |
158 | s->ddc_skip_finish = false; | |
159 | s->ddc = false; | |
160 | } | |
161 | ||
162 | static void sii9022_realize(DeviceState *dev, Error **errp) | |
163 | { | |
164 | I2CBus *bus; | |
165 | ||
166 | bus = I2C_BUS(qdev_get_parent_bus(dev)); | |
1373b15b | 167 | i2c_slave_create_simple(bus, TYPE_I2CDDC, 0x50); |
a643bd77 LW |
168 | } |
169 | ||
170 | static void sii9022_class_init(ObjectClass *klass, void *data) | |
171 | { | |
172 | DeviceClass *dc = DEVICE_CLASS(klass); | |
173 | I2CSlaveClass *k = I2C_SLAVE_CLASS(klass); | |
174 | ||
175 | k->event = sii9022_event; | |
176 | k->recv = sii9022_rx; | |
177 | k->send = sii9022_tx; | |
178 | dc->reset = sii9022_reset; | |
179 | dc->realize = sii9022_realize; | |
180 | dc->vmsd = &vmstate_sii9022; | |
181 | } | |
182 | ||
183 | static const TypeInfo sii9022_info = { | |
184 | .name = TYPE_SII9022, | |
185 | .parent = TYPE_I2C_SLAVE, | |
186 | .instance_size = sizeof(sii9022_state), | |
187 | .class_init = sii9022_class_init, | |
188 | }; | |
189 | ||
190 | static void sii9022_register_types(void) | |
191 | { | |
192 | type_register_static(&sii9022_info); | |
193 | } | |
194 | ||
195 | type_init(sii9022_register_types) |