arm: Update code for several boards to match latest QEMU API
[qemu/ar7.git] / hw / i2c / i2c-ddc.c
blob7aa872777145da1329add1b7ef2e07afb05de294
1 /* A simple I2C slave for returning monitor EDID data via DDC.
3 * Copyright (c) 2011 Linaro Limited
4 * Written by Peter Maydell
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, see <http://www.gnu.org/licenses/>.
19 #include "qemu/osdep.h"
20 #include "qemu-common.h"
21 #include "qemu/log.h"
22 #include "hw/i2c/i2c.h"
23 #include "hw/i2c/i2c-ddc.h"
25 #ifndef DEBUG_I2CDDC
26 #define DEBUG_I2CDDC 0
27 #endif
29 #define DPRINTF(fmt, ...) do { \
30 if (DEBUG_I2CDDC) { \
31 qemu_log("i2c-ddc: " fmt , ## __VA_ARGS__); \
32 } \
33 } while (0)
35 static void i2c_ddc_reset(DeviceState *ds)
37 I2CDDCState *s = I2CDDC(ds);
39 s->firstbyte = false;
40 s->reg = 0;
43 static int i2c_ddc_event(I2CSlave *i2c, enum i2c_event event)
45 I2CDDCState *s = I2CDDC(i2c);
47 if (event == I2C_START_SEND) {
48 s->firstbyte = true;
51 return 0;
54 static uint8_t i2c_ddc_rx(I2CSlave *i2c)
56 I2CDDCState *s = I2CDDC(i2c);
58 int value;
59 value = s->edid_blob[s->reg % sizeof(s->edid_blob)];
60 s->reg++;
61 return value;
64 static int i2c_ddc_tx(I2CSlave *i2c, uint8_t data)
66 I2CDDCState *s = I2CDDC(i2c);
67 if (s->firstbyte) {
68 s->reg = data;
69 s->firstbyte = false;
70 DPRINTF("[EDID] Written new pointer: %u\n", data);
71 return 0;
74 /* Ignore all writes */
75 s->reg++;
76 return 0;
79 static void i2c_ddc_init(Object *obj)
81 I2CDDCState *s = I2CDDC(obj);
83 qemu_edid_generate(s->edid_blob, sizeof(s->edid_blob), &s->edid_info);
86 static const VMStateDescription vmstate_i2c_ddc = {
87 .name = TYPE_I2CDDC,
88 .version_id = 1,
89 .fields = (VMStateField[]) {
90 VMSTATE_BOOL(firstbyte, I2CDDCState),
91 VMSTATE_UINT8(reg, I2CDDCState),
92 VMSTATE_END_OF_LIST()
96 static Property i2c_ddc_properties[] = {
97 DEFINE_EDID_PROPERTIES(I2CDDCState, edid_info),
98 DEFINE_PROP_END_OF_LIST(),
101 static void i2c_ddc_class_init(ObjectClass *oc, void *data)
103 DeviceClass *dc = DEVICE_CLASS(oc);
104 I2CSlaveClass *isc = I2C_SLAVE_CLASS(oc);
106 dc->reset = i2c_ddc_reset;
107 dc->vmsd = &vmstate_i2c_ddc;
108 dc->props = i2c_ddc_properties;
109 isc->event = i2c_ddc_event;
110 isc->recv = i2c_ddc_rx;
111 isc->send = i2c_ddc_tx;
114 static TypeInfo i2c_ddc_info = {
115 .name = TYPE_I2CDDC,
116 .parent = TYPE_I2C_SLAVE,
117 .instance_size = sizeof(I2CDDCState),
118 .instance_init = i2c_ddc_init,
119 .class_init = i2c_ddc_class_init
122 static void ddc_register_devices(void)
124 type_register_static(&i2c_ddc_info);
127 type_init(ddc_register_devices);