5  * exist (chip ID) and confirm that we get switched over into DDC mode
7  * set-up of connectors etc will be acknowledged and ignored.
12  * See the COPYING file in the top-level directory.
13  * SPDX-License-Identifier: GPL-2.0-or-later
18 #include "hw/i2c/i2c.h"
20 #include "hw/display/i2c-ddc.h"
47     bool ddc;  member
60         VMSTATE_BOOL(ddc, sii9022_state),
65 static int sii9022_event(I2CSlave *i2c, enum i2c_event event)  in sii9022_event()  argument
67     sii9022_state *s = SII9022(i2c);  in sii9022_event()
71         s->addr_byte = true;  in sii9022_event()
80         return -1;  in sii9022_event()
86 static uint8_t sii9022_rx(I2CSlave *i2c)  in sii9022_rx()  argument
88     sii9022_state *s = SII9022(i2c);  in sii9022_rx()
91     switch (s->ptr) {  in sii9022_rx()
93         if (s->ddc_req) {  in sii9022_rx()
94             /* Acknowledge DDC bus request */  in sii9022_rx()
102         /* Something is cold-plugged in, no interrupts */  in sii9022_rx()
109     trace_sii9022_read_reg(s->ptr, res);  in sii9022_rx()
110     s->ptr++;  in sii9022_rx()
115 static int sii9022_tx(I2CSlave *i2c, uint8_t data)  in sii9022_tx()  argument
117     sii9022_state *s = SII9022(i2c);  in sii9022_tx()
119     if (s->addr_byte) {  in sii9022_tx()
120         s->ptr = data;  in sii9022_tx()
121         s->addr_byte = false;  in sii9022_tx()
125     switch (s->ptr) {  in sii9022_tx()
128             s->ddc_req = true;  in sii9022_tx()
130                 s->ddc = true;  in sii9022_tx()
131                 /* Skip this finish since we just switched to DDC */  in sii9022_tx()
132                 s->ddc_skip_finish = true;  in sii9022_tx()
133                 trace_sii9022_switch_mode("DDC");  in sii9022_tx()
136             s->ddc_req = false;  in sii9022_tx()
137             s->ddc = false;  in sii9022_tx()
145     trace_sii9022_write_reg(s->ptr, data);  in sii9022_tx()
146     s->ptr++;  in sii9022_tx()
155     s->ptr = 0;  in sii9022_reset()
156     s->addr_byte = false;  in sii9022_reset()
157     s->ddc_req = false;  in sii9022_reset()
158     s->ddc_skip_finish = false;  in sii9022_reset()
159     s->ddc = false;  in sii9022_reset()
164     I2CBus *bus;  in sii9022_realize()  local
166     bus = I2C_BUS(qdev_get_parent_bus(dev));  in sii9022_realize()
167     i2c_slave_create_simple(bus, TYPE_I2CDDC, 0x50);  in sii9022_realize()
175     k->event = sii9022_event;  in sii9022_class_init()
176     k->recv = sii9022_rx;  in sii9022_class_init()
177     k->send = sii9022_tx;  in sii9022_class_init()
179     dc->realize = sii9022_realize;  in sii9022_class_init()
180     dc->vmsd = &vmstate_sii9022;  in sii9022_class_init()