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qemu/hw/display/ssd0303.c
Richard Henderson f0613160d2 hw/display: Constify VMState 
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20231221031652.119827-27-richard.henderson@linaro.org>
2023-12-29 11:17:30 +11:00

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/*
* SSD0303 OLED controller with OSRAM Pictiva 96x16 display.
*
* Copyright (c) 2006-2007 CodeSourcery.
* Written by Paul Brook
*
* This code is licensed under the GPL.
*/
/* The controller can support a variety of different displays, but we only
implement one. Most of the commands relating to brightness and geometry
setup are ignored. */
#include "qemu/osdep.h"
#include "hw/i2c/i2c.h"
#include "migration/vmstate.h"
#include "qemu/module.h"
#include "ui/console.h"
#include "qom/object.h"
//#define DEBUG_SSD0303 1
#ifdef DEBUG_SSD0303
#define DPRINTF(fmt, ...) \
do { printf("ssd0303: " fmt , ## __VA_ARGS__); } while (0)
#define BADF(fmt, ...) \
do { fprintf(stderr, "ssd0303: error: " fmt , ## __VA_ARGS__); exit(1);} while (0)
#else
#define DPRINTF(fmt, ...) do {} while(0)
#define BADF(fmt, ...) \
do { fprintf(stderr, "ssd0303: error: " fmt , ## __VA_ARGS__);} while (0)
#endif
/* Scaling factor for pixels. */
#define MAGNIFY 4
enum ssd0303_mode
{
SSD0303_IDLE,
SSD0303_DATA,
SSD0303_CMD
};
enum ssd0303_cmd {
SSD0303_CMD_NONE,
SSD0303_CMD_SKIP1
};
#define TYPE_SSD0303 "ssd0303"
OBJECT_DECLARE_SIMPLE_TYPE(ssd0303_state, SSD0303)
struct ssd0303_state {
I2CSlave parent_obj;
QemuConsole *con;
int row;
int col;
int start_line;
int mirror;
int flash;
int enabled;
int inverse;
int redraw;
enum ssd0303_mode mode;
enum ssd0303_cmd cmd_state;
uint8_t framebuffer[132*8];
};
static uint8_t ssd0303_recv(I2CSlave *i2c)
{
BADF("Reads not implemented\n");
return 0xff;
}
static int ssd0303_send(I2CSlave *i2c, uint8_t data)
{
ssd0303_state *s = SSD0303(i2c);
enum ssd0303_cmd old_cmd_state;
switch (s->mode) {
case SSD0303_IDLE:
DPRINTF("byte 0x%02x\n", data);
if (data == 0x80)
s->mode = SSD0303_CMD;
else if (data == 0x40)
s->mode = SSD0303_DATA;
else
BADF("Unexpected byte 0x%x\n", data);
break;
case SSD0303_DATA:
DPRINTF("data 0x%02x\n", data);
if (s->col < 132) {
s->framebuffer[s->col + s->row * 132] = data;
s->col++;
s->redraw = 1;
}
break;
case SSD0303_CMD:
old_cmd_state = s->cmd_state;
s->cmd_state = SSD0303_CMD_NONE;
switch (old_cmd_state) {
case SSD0303_CMD_NONE:
DPRINTF("cmd 0x%02x\n", data);
s->mode = SSD0303_IDLE;
switch (data) {
case 0x00 ... 0x0f: /* Set lower column address. */
s->col = (s->col & 0xf0) | (data & 0xf);
break;
case 0x10 ... 0x20: /* Set higher column address. */
s->col = (s->col & 0x0f) | ((data & 0xf) << 4);
break;
case 0x40 ... 0x7f: /* Set start line. */
s->start_line = 0;
break;
case 0x81: /* Set contrast (Ignored). */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xa0: /* Mirror off. */
s->mirror = 0;
break;
case 0xa1: /* Mirror off. */
s->mirror = 1;
break;
case 0xa4: /* Entire display off. */
s->flash = 0;
break;
case 0xa5: /* Entire display on. */
s->flash = 1;
break;
case 0xa6: /* Inverse off. */
s->inverse = 0;
break;
case 0xa7: /* Inverse on. */
s->inverse = 1;
break;
case 0xa8: /* Set multiplied ratio (Ignored). */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xad: /* DC-DC power control. */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xae: /* Display off. */
s->enabled = 0;
break;
case 0xaf: /* Display on. */
s->enabled = 1;
break;
case 0xb0 ... 0xbf: /* Set Page address. */
s->row = data & 7;
break;
case 0xc0 ... 0xc8: /* Set COM output direction (Ignored). */
break;
case 0xd3: /* Set display offset (Ignored). */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xd5: /* Set display clock (Ignored). */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xd8: /* Set color and power mode (Ignored). */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xd9: /* Set pre-charge period (Ignored). */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xda: /* Set COM pin configuration (Ignored). */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xdb: /* Set VCOM dselect level (Ignored). */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xe3: /* no-op. */
break;
default:
BADF("Unknown command: 0x%x\n", data);
}
break;
case SSD0303_CMD_SKIP1:
DPRINTF("skip 0x%02x\n", data);
break;
}
break;
}
return 0;
}
static int ssd0303_event(I2CSlave *i2c, enum i2c_event event)
{
ssd0303_state *s = SSD0303(i2c);
switch (event) {
case I2C_FINISH:
s->mode = SSD0303_IDLE;
break;
case I2C_START_RECV:
case I2C_START_SEND:
case I2C_NACK:
/* Nothing to do. */
break;
default:
return -1;
}
return 0;
}
static void ssd0303_update_display(void *opaque)
{
ssd0303_state *s = (ssd0303_state *)opaque;
DisplaySurface *surface = qemu_console_surface(s->con);
uint8_t *dest;
uint8_t *src;
int x;
int y;
int line;
char *colors[2];
char colortab[MAGNIFY * 8];
int dest_width;
uint8_t mask;
if (!s->redraw)
return;
switch (surface_bits_per_pixel(surface)) {
case 0:
return;
case 15:
dest_width = 2;
break;
case 16:
dest_width = 2;
break;
case 24:
dest_width = 3;
break;
case 32:
dest_width = 4;
break;
default:
BADF("Bad color depth\n");
return;
}
dest_width *= MAGNIFY;
memset(colortab, 0xff, dest_width);
memset(colortab + dest_width, 0, dest_width);
if (s->flash) {
colors[0] = colortab;
colors[1] = colortab;
} else if (s->inverse) {
colors[0] = colortab;
colors[1] = colortab + dest_width;
} else {
colors[0] = colortab + dest_width;
colors[1] = colortab;
}
dest = surface_data(surface);
for (y = 0; y < 16; y++) {
line = (y + s->start_line) & 63;
src = s->framebuffer + 132 * (line >> 3) + 36;
mask = 1 << (line & 7);
for (x = 0; x < 96; x++) {
memcpy(dest, colors[(*src & mask) != 0], dest_width);
dest += dest_width;
src++;
}
for (x = 1; x < MAGNIFY; x++) {
memcpy(dest, dest - dest_width * 96, dest_width * 96);
dest += dest_width * 96;
}
}
s->redraw = 0;
dpy_gfx_update(s->con, 0, 0, 96 * MAGNIFY, 16 * MAGNIFY);
}
static void ssd0303_invalidate_display(void * opaque)
{
ssd0303_state *s = (ssd0303_state *)opaque;
s->redraw = 1;
}
static const VMStateDescription vmstate_ssd0303 = {
.name = "ssd0303_oled",
.version_id = 1,
.minimum_version_id = 1,
.fields = (const VMStateField[]) {
VMSTATE_INT32(row, ssd0303_state),
VMSTATE_INT32(col, ssd0303_state),
VMSTATE_INT32(start_line, ssd0303_state),
VMSTATE_INT32(mirror, ssd0303_state),
VMSTATE_INT32(flash, ssd0303_state),
VMSTATE_INT32(enabled, ssd0303_state),
VMSTATE_INT32(inverse, ssd0303_state),
VMSTATE_INT32(redraw, ssd0303_state),
VMSTATE_UINT32(mode, ssd0303_state),
VMSTATE_UINT32(cmd_state, ssd0303_state),
VMSTATE_BUFFER(framebuffer, ssd0303_state),
VMSTATE_I2C_SLAVE(parent_obj, ssd0303_state),
VMSTATE_END_OF_LIST()
}
};
static const GraphicHwOps ssd0303_ops = {
.invalidate = ssd0303_invalidate_display,
.gfx_update = ssd0303_update_display,
};
static void ssd0303_realize(DeviceState *dev, Error **errp)
{
ssd0303_state *s = SSD0303(dev);
s->con = graphic_console_init(dev, 0, &ssd0303_ops, s);
qemu_console_resize(s->con, 96 * MAGNIFY, 16 * MAGNIFY);
}
static void ssd0303_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
dc->realize = ssd0303_realize;
k->event = ssd0303_event;
k->recv = ssd0303_recv;
k->send = ssd0303_send;
dc->vmsd = &vmstate_ssd0303;
}
static const TypeInfo ssd0303_info = {
.name = TYPE_SSD0303,
.parent = TYPE_I2C_SLAVE,
.instance_size = sizeof(ssd0303_state),
.class_init = ssd0303_class_init,
};
static void ssd0303_register_types(void)
{
type_register_static(&ssd0303_info);
}
type_init(ssd0303_register_types)
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