From 6306cae275c7091aa4e785809d956b475bfedab4 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Mon, 25 Mar 2019 16:59:23 +0100 Subject: i2c-ddc: move it to hw/display MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Move it together with the other EDID code. hw/i2c should only include the core and the adapters, not the slaves. Signed-off-by: Paolo Bonzini Reviewed-by: Philippe Mathieu-Daudé Message-id: 20190325155923.30987-1-pbonzini@redhat.com Signed-off-by: Gerd Hoffmann --- hw/display/i2c-ddc.c | 127 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 127 insertions(+) create mode 100644 hw/display/i2c-ddc.c (limited to 'hw/display/i2c-ddc.c') diff --git a/hw/display/i2c-ddc.c b/hw/display/i2c-ddc.c new file mode 100644 index 0000000..9fe5403 --- /dev/null +++ b/hw/display/i2c-ddc.c @@ -0,0 +1,127 @@ +/* A simple I2C slave for returning monitor EDID data via DDC. + * + * Copyright (c) 2011 Linaro Limited + * Written by Peter Maydell + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, see . + */ + +#include "qemu/osdep.h" +#include "qemu-common.h" +#include "qemu/log.h" +#include "hw/i2c/i2c.h" +#include "hw/display/i2c-ddc.h" + +#ifndef DEBUG_I2CDDC +#define DEBUG_I2CDDC 0 +#endif + +#define DPRINTF(fmt, ...) do { \ + if (DEBUG_I2CDDC) { \ + qemu_log("i2c-ddc: " fmt , ## __VA_ARGS__); \ + } \ +} while (0) + +static void i2c_ddc_reset(DeviceState *ds) +{ + I2CDDCState *s = I2CDDC(ds); + + s->firstbyte = false; + s->reg = 0; +} + +static int i2c_ddc_event(I2CSlave *i2c, enum i2c_event event) +{ + I2CDDCState *s = I2CDDC(i2c); + + if (event == I2C_START_SEND) { + s->firstbyte = true; + } + + return 0; +} + +static uint8_t i2c_ddc_rx(I2CSlave *i2c) +{ + I2CDDCState *s = I2CDDC(i2c); + + int value; + value = s->edid_blob[s->reg % sizeof(s->edid_blob)]; + s->reg++; + return value; +} + +static int i2c_ddc_tx(I2CSlave *i2c, uint8_t data) +{ + I2CDDCState *s = I2CDDC(i2c); + if (s->firstbyte) { + s->reg = data; + s->firstbyte = false; + DPRINTF("[EDID] Written new pointer: %u\n", data); + return 0; + } + + /* Ignore all writes */ + s->reg++; + return 0; +} + +static void i2c_ddc_init(Object *obj) +{ + I2CDDCState *s = I2CDDC(obj); + + qemu_edid_generate(s->edid_blob, sizeof(s->edid_blob), &s->edid_info); +} + +static const VMStateDescription vmstate_i2c_ddc = { + .name = TYPE_I2CDDC, + .version_id = 1, + .fields = (VMStateField[]) { + VMSTATE_BOOL(firstbyte, I2CDDCState), + VMSTATE_UINT8(reg, I2CDDCState), + VMSTATE_END_OF_LIST() + } +}; + +static Property i2c_ddc_properties[] = { + DEFINE_EDID_PROPERTIES(I2CDDCState, edid_info), + DEFINE_PROP_END_OF_LIST(), +}; + +static void i2c_ddc_class_init(ObjectClass *oc, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(oc); + I2CSlaveClass *isc = I2C_SLAVE_CLASS(oc); + + dc->reset = i2c_ddc_reset; + dc->vmsd = &vmstate_i2c_ddc; + dc->props = i2c_ddc_properties; + isc->event = i2c_ddc_event; + isc->recv = i2c_ddc_rx; + isc->send = i2c_ddc_tx; +} + +static TypeInfo i2c_ddc_info = { + .name = TYPE_I2CDDC, + .parent = TYPE_I2C_SLAVE, + .instance_size = sizeof(I2CDDCState), + .instance_init = i2c_ddc_init, + .class_init = i2c_ddc_class_init +}; + +static void ddc_register_devices(void) +{ + type_register_static(&i2c_ddc_info); +} + +type_init(ddc_register_devices); -- cgit v1.1