1 /* A simple I2C slave for returning monitor EDID data via DDC.
22 #include "hw/i2c/i2c.h"
23 #include "hw/qdev-properties.h"
25 #include "hw/display/i2c-ddc.h"
33         qemu_log("i2c-ddc: " fmt , ## __VA_ARGS__);                            \
41     s->firstbyte = false;  in i2c_ddc_reset()
42     s->reg = 0;  in i2c_ddc_reset()
45 static int i2c_ddc_event(I2CSlave *i2c, enum i2c_event event)  in i2c_ddc_event()  argument
47     I2CDDCState *s = I2CDDC(i2c);  in i2c_ddc_event()
50         s->firstbyte = true;  in i2c_ddc_event()
56 static uint8_t i2c_ddc_rx(I2CSlave *i2c)  in i2c_ddc_rx()  argument
58     I2CDDCState *s = I2CDDC(i2c);  in i2c_ddc_rx()
61     value = s->edid_blob[s->reg % sizeof(s->edid_blob)];  in i2c_ddc_rx()
62     s->reg++;  in i2c_ddc_rx()
66 static int i2c_ddc_tx(I2CSlave *i2c, uint8_t data)  in i2c_ddc_tx()  argument
68     I2CDDCState *s = I2CDDC(i2c);  in i2c_ddc_tx()
69     if (s->firstbyte) {  in i2c_ddc_tx()
70         s->reg = data;  in i2c_ddc_tx()
71         s->firstbyte = false;  in i2c_ddc_tx()
77     s->reg++;  in i2c_ddc_tx()
85     qemu_edid_generate(s->edid_blob, sizeof(s->edid_blob), &s->edid_info);  in i2c_ddc_init()
109     dc->vmsd = &vmstate_i2c_ddc;  in i2c_ddc_class_init()
111     isc->event = i2c_ddc_event;  in i2c_ddc_class_init()
112     isc->recv = i2c_ddc_rx;  in i2c_ddc_class_init()
113     isc->send = i2c_ddc_tx;  in i2c_ddc_class_init()