qemu/hw/i2c/i2c-ddc.c
Juan Quintela 08a0aee15c migration: Split qemu-file.h
Split the file into public and internal interfaces.  I have to rename
the external one because we can't have two include files with the same
name in the same directory.  Build system gets confused.  The only
exported functions are the ones that handle basic types.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2017-06-01 18:49:22 +02:00

312 lines
8.4 KiB
C

/* 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 <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qemu/log.h"
#include "hw/i2c/i2c.h"
#include "hw/i2c/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);
/* Structure defining a monitor's characteristics in a
* readable format: this should be passed to build_edid_blob()
* to convert it into the 128 byte binary EDID blob.
* Not all bits of the EDID are customisable here.
*/
struct EDIDData {
char manuf_id[3]; /* three upper case letters */
uint16_t product_id;
uint32_t serial_no;
uint8_t manuf_week;
int manuf_year;
uint8_t h_cm;
uint8_t v_cm;
uint8_t gamma;
char monitor_name[14];
char serial_no_string[14];
/* Range limits */
uint8_t vmin; /* Hz */
uint8_t vmax; /* Hz */
uint8_t hmin; /* kHz */
uint8_t hmax; /* kHz */
uint8_t pixclock; /* MHz / 10 */
uint8_t timing_data[18];
};
typedef struct EDIDData EDIDData;
/* EDID data for a simple LCD monitor */
static const EDIDData lcd_edid = {
/* The manuf_id ought really to be an assigned EISA ID */
.manuf_id = "QMU",
.product_id = 0,
.serial_no = 1,
.manuf_week = 1,
.manuf_year = 2011,
.h_cm = 40,
.v_cm = 30,
.gamma = 0x78,
.monitor_name = "QEMU monitor",
.serial_no_string = "1",
.vmin = 40,
.vmax = 120,
.hmin = 30,
.hmax = 100,
.pixclock = 18,
.timing_data = {
/* Borrowed from a 21" LCD */
0x48, 0x3f, 0x40, 0x30, 0x62, 0xb0, 0x32, 0x40, 0x40,
0xc0, 0x13, 0x00, 0x98, 0x32, 0x11, 0x00, 0x00, 0x1e
}
};
static uint8_t manuf_char_to_int(char c)
{
return (c - 'A') & 0x1f;
}
static void write_ascii_descriptor_block(uint8_t *descblob, uint8_t blocktype,
const char *string)
{
/* Write an EDID Descriptor Block of the "ascii string" type */
int i;
descblob[0] = descblob[1] = descblob[2] = descblob[4] = 0;
descblob[3] = blocktype;
/* The rest is 13 bytes of ASCII; if less then the rest must
* be filled with newline then spaces
*/
for (i = 5; i < 19; i++) {
descblob[i] = string[i - 5];
if (!descblob[i]) {
break;
}
}
if (i < 19) {
descblob[i++] = '\n';
}
for ( ; i < 19; i++) {
descblob[i] = ' ';
}
}
static void write_range_limits_descriptor(const EDIDData *edid,
uint8_t *descblob)
{
int i;
descblob[0] = descblob[1] = descblob[2] = descblob[4] = 0;
descblob[3] = 0xfd;
descblob[5] = edid->vmin;
descblob[6] = edid->vmax;
descblob[7] = edid->hmin;
descblob[8] = edid->hmax;
descblob[9] = edid->pixclock;
descblob[10] = 0;
descblob[11] = 0xa;
for (i = 12; i < 19; i++) {
descblob[i] = 0x20;
}
}
static void build_edid_blob(const EDIDData *edid, uint8_t *blob)
{
/* Write an EDID 1.3 format blob (128 bytes) based
* on the EDIDData structure.
*/
int i;
uint8_t cksum;
/* 00-07 : header */
blob[0] = blob[7] = 0;
for (i = 1 ; i < 7; i++) {
blob[i] = 0xff;
}
/* 08-09 : manufacturer ID */
blob[8] = (manuf_char_to_int(edid->manuf_id[0]) << 2)
| (manuf_char_to_int(edid->manuf_id[1]) >> 3);
blob[9] = (manuf_char_to_int(edid->manuf_id[1]) << 5)
| manuf_char_to_int(edid->manuf_id[2]);
/* 10-11 : product ID code */
blob[10] = edid->product_id;
blob[11] = edid->product_id >> 8;
blob[12] = edid->serial_no;
blob[13] = edid->serial_no >> 8;
blob[14] = edid->serial_no >> 16;
blob[15] = edid->serial_no >> 24;
/* 16 : week of manufacture */
blob[16] = edid->manuf_week;
/* 17 : year of manufacture - 1990 */
blob[17] = edid->manuf_year - 1990;
/* 18, 19 : EDID version and revision */
blob[18] = 1;
blob[19] = 3;
/* 20 - 24 : basic display parameters */
/* We are always a digital display */
blob[20] = 0x80;
/* 21, 22 : max h/v size in cm */
blob[21] = edid->h_cm;
blob[22] = edid->v_cm;
/* 23 : gamma (divide by 100 then add 1 for actual value) */
blob[23] = edid->gamma;
/* 24 feature support: no power management, RGB, preferred timing mode,
* standard colour space
*/
blob[24] = 0x0e;
/* 25 - 34 : chromaticity coordinates. These are the
* standard sRGB chromaticity values
*/
blob[25] = 0xee;
blob[26] = 0x91;
blob[27] = 0xa3;
blob[28] = 0x54;
blob[29] = 0x4c;
blob[30] = 0x99;
blob[31] = 0x26;
blob[32] = 0x0f;
blob[33] = 0x50;
blob[34] = 0x54;
/* 35, 36 : Established timings: claim to support everything */
blob[35] = blob[36] = 0xff;
/* 37 : manufacturer's reserved timing: none */
blob[37] = 0;
/* 38 - 53 : standard timing identification
* don't claim anything beyond what the 'established timings'
* already provide. Unused slots must be (0x1, 0x1)
*/
for (i = 38; i < 54; i++) {
blob[i] = 0x1;
}
/* 54 - 71 : descriptor block 1 : must be preferred timing data */
memcpy(blob + 54, edid->timing_data, 18);
/* 72 - 89, 90 - 107, 108 - 125 : descriptor block 2, 3, 4
* Order not important, but we must have a monitor name and a
* range limits descriptor.
*/
write_range_limits_descriptor(edid, blob + 72);
write_ascii_descriptor_block(blob + 90, 0xfc, edid->monitor_name);
write_ascii_descriptor_block(blob + 108, 0xff, edid->serial_no_string);
/* 126 : extension flag */
blob[126] = 0;
cksum = 0;
for (i = 0; i < 127; i++) {
cksum += blob[i];
}
/* 127 : checksum */
blob[127] = -cksum;
if (DEBUG_I2CDDC) {
qemu_hexdump((char *)blob, stdout, "", 128);
}
}
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 int i2c_ddc_rx(I2CSlave *i2c)
{
I2CDDCState *s = I2CDDC(i2c);
int value;
value = s->edid_blob[s->reg];
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 1;
}
/* Ignore all writes */
s->reg++;
return 1;
}
static void i2c_ddc_init(Object *obj)
{
I2CDDCState *s = I2CDDC(obj);
build_edid_blob(&lcd_edid, s->edid_blob);
}
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 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;
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);