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qemu-e2k/hw/display/ssd0303.c
Corey Minyard 2ac4c5f4d2 i2c: have I2C receive operation return uint8_t 
It is never supposed to fail and cannot return an error, so just
have it return the proper type.  Have it return 0xff on nothing
available, since that's what would happen on a real bus.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
2019-02-27 21:06:08 -06:00

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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 commends relating to brightness and geometry
setup are ignored. */
#include "qemu/osdep.h"
#include "hw/i2c/i2c.h"
#include "ui/console.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"
#define SSD0303(obj) OBJECT_CHECK(ssd0303_state, (obj), TYPE_SSD0303)
typedef struct {
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];
} ssd0303_state;
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;
}
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 = (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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