qemu/hw/display/ssd0303.c
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   1/*
   2 * SSD0303 OLED controller with OSRAM Pictiva 96x16 display.
   3 *
   4 * Copyright (c) 2006-2007 CodeSourcery.
   5 * Written by Paul Brook
   6 *
   7 * This code is licensed under the GPL.
   8 */
   9
  10/* The controller can support a variety of different displays, but we only
  11   implement one.  Most of the commends relating to brightness and geometry
  12   setup are ignored. */
  13#include "qemu/osdep.h"
  14#include "hw/i2c/i2c.h"
  15#include "ui/console.h"
  16
  17//#define DEBUG_SSD0303 1
  18
  19#ifdef DEBUG_SSD0303
  20#define DPRINTF(fmt, ...) \
  21do { printf("ssd0303: " fmt , ## __VA_ARGS__); } while (0)
  22#define BADF(fmt, ...) \
  23do { fprintf(stderr, "ssd0303: error: " fmt , ## __VA_ARGS__); exit(1);} while (0)
  24#else
  25#define DPRINTF(fmt, ...) do {} while(0)
  26#define BADF(fmt, ...) \
  27do { fprintf(stderr, "ssd0303: error: " fmt , ## __VA_ARGS__);} while (0)
  28#endif
  29
  30/* Scaling factor for pixels.  */
  31#define MAGNIFY 4
  32
  33enum ssd0303_mode
  34{
  35    SSD0303_IDLE,
  36    SSD0303_DATA,
  37    SSD0303_CMD
  38};
  39
  40enum ssd0303_cmd {
  41    SSD0303_CMD_NONE,
  42    SSD0303_CMD_SKIP1
  43};
  44
  45#define TYPE_SSD0303 "ssd0303"
  46#define SSD0303(obj) OBJECT_CHECK(ssd0303_state, (obj), TYPE_SSD0303)
  47
  48typedef struct {
  49    I2CSlave parent_obj;
  50
  51    QemuConsole *con;
  52    int row;
  53    int col;
  54    int start_line;
  55    int mirror;
  56    int flash;
  57    int enabled;
  58    int inverse;
  59    int redraw;
  60    enum ssd0303_mode mode;
  61    enum ssd0303_cmd cmd_state;
  62    uint8_t framebuffer[132*8];
  63} ssd0303_state;
  64
  65static int ssd0303_recv(I2CSlave *i2c)
  66{
  67    BADF("Reads not implemented\n");
  68    return -1;
  69}
  70
  71static int ssd0303_send(I2CSlave *i2c, uint8_t data)
  72{
  73    ssd0303_state *s = SSD0303(i2c);
  74    enum ssd0303_cmd old_cmd_state;
  75
  76    switch (s->mode) {
  77    case SSD0303_IDLE:
  78        DPRINTF("byte 0x%02x\n", data);
  79        if (data == 0x80)
  80            s->mode = SSD0303_CMD;
  81        else if (data == 0x40)
  82            s->mode = SSD0303_DATA;
  83        else
  84            BADF("Unexpected byte 0x%x\n", data);
  85        break;
  86    case SSD0303_DATA:
  87        DPRINTF("data 0x%02x\n", data);
  88        if (s->col < 132) {
  89            s->framebuffer[s->col + s->row * 132] = data;
  90            s->col++;
  91            s->redraw = 1;
  92        }
  93        break;
  94    case SSD0303_CMD:
  95        old_cmd_state = s->cmd_state;
  96        s->cmd_state = SSD0303_CMD_NONE;
  97        switch (old_cmd_state) {
  98        case SSD0303_CMD_NONE:
  99            DPRINTF("cmd 0x%02x\n", data);
 100            s->mode = SSD0303_IDLE;
 101            switch (data) {
 102            case 0x00 ... 0x0f: /* Set lower column address.  */
 103                s->col = (s->col & 0xf0) | (data & 0xf);
 104                break;
 105            case 0x10 ... 0x20: /* Set higher column address.  */
 106                s->col = (s->col & 0x0f) | ((data & 0xf) << 4);
 107                break;
 108            case 0x40 ... 0x7f: /* Set start line.  */
 109                s->start_line = 0;
 110                break;
 111            case 0x81: /* Set contrast (Ignored).  */
 112                s->cmd_state = SSD0303_CMD_SKIP1;
 113                break;
 114            case 0xa0: /* Mirror off.  */
 115                s->mirror = 0;
 116                break;
 117            case 0xa1: /* Mirror off.  */
 118                s->mirror = 1;
 119                break;
 120            case 0xa4: /* Entire display off.  */
 121                s->flash = 0;
 122                break;
 123            case 0xa5: /* Entire display on.  */
 124                s->flash = 1;
 125                break;
 126            case 0xa6: /* Inverse off.  */
 127                s->inverse = 0;
 128                break;
 129            case 0xa7: /* Inverse on.  */
 130                s->inverse = 1;
 131                break;
 132            case 0xa8: /* Set multiplied ratio (Ignored).  */
 133                s->cmd_state = SSD0303_CMD_SKIP1;
 134                break;
 135            case 0xad: /* DC-DC power control.  */
 136                s->cmd_state = SSD0303_CMD_SKIP1;
 137                break;
 138            case 0xae: /* Display off.  */
 139                s->enabled = 0;
 140                break;
 141            case 0xaf: /* Display on.  */
 142                s->enabled = 1;
 143                break;
 144            case 0xb0 ... 0xbf: /* Set Page address.  */
 145                s->row = data & 7;
 146                break;
 147            case 0xc0 ... 0xc8: /* Set COM output direction (Ignored).  */
 148                break;
 149            case 0xd3: /* Set display offset (Ignored).  */
 150                s->cmd_state = SSD0303_CMD_SKIP1;
 151                break;
 152            case 0xd5: /* Set display clock (Ignored).  */
 153                s->cmd_state = SSD0303_CMD_SKIP1;
 154                break;
 155            case 0xd8: /* Set color and power mode (Ignored).  */
 156                s->cmd_state = SSD0303_CMD_SKIP1;
 157                break;
 158            case 0xd9: /* Set pre-charge period (Ignored).  */
 159                s->cmd_state = SSD0303_CMD_SKIP1;
 160                break;
 161            case 0xda: /* Set COM pin configuration (Ignored).  */
 162                s->cmd_state = SSD0303_CMD_SKIP1;
 163                break;
 164            case 0xdb: /* Set VCOM dselect level (Ignored).  */
 165                s->cmd_state = SSD0303_CMD_SKIP1;
 166                break;
 167            case 0xe3: /* no-op.  */
 168                break;
 169            default:
 170                BADF("Unknown command: 0x%x\n", data);
 171            }
 172            break;
 173        case SSD0303_CMD_SKIP1:
 174            DPRINTF("skip 0x%02x\n", data);
 175            break;
 176        }
 177        break;
 178    }
 179    return 0;
 180}
 181
 182static int ssd0303_event(I2CSlave *i2c, enum i2c_event event)
 183{
 184    ssd0303_state *s = SSD0303(i2c);
 185
 186    switch (event) {
 187    case I2C_FINISH:
 188        s->mode = SSD0303_IDLE;
 189        break;
 190    case I2C_START_RECV:
 191    case I2C_START_SEND:
 192    case I2C_NACK:
 193        /* Nothing to do.  */
 194        break;
 195    }
 196
 197    return 0;
 198}
 199
 200static void ssd0303_update_display(void *opaque)
 201{
 202    ssd0303_state *s = (ssd0303_state *)opaque;
 203    DisplaySurface *surface = qemu_console_surface(s->con);
 204    uint8_t *dest;
 205    uint8_t *src;
 206    int x;
 207    int y;
 208    int line;
 209    char *colors[2];
 210    char colortab[MAGNIFY * 8];
 211    int dest_width;
 212    uint8_t mask;
 213
 214    if (!s->redraw)
 215        return;
 216
 217    switch (surface_bits_per_pixel(surface)) {
 218    case 0:
 219        return;
 220    case 15:
 221        dest_width = 2;
 222        break;
 223    case 16:
 224        dest_width = 2;
 225        break;
 226    case 24:
 227        dest_width = 3;
 228        break;
 229    case 32:
 230        dest_width = 4;
 231        break;
 232    default:
 233        BADF("Bad color depth\n");
 234        return;
 235    }
 236    dest_width *= MAGNIFY;
 237    memset(colortab, 0xff, dest_width);
 238    memset(colortab + dest_width, 0, dest_width);
 239    if (s->flash) {
 240        colors[0] = colortab;
 241        colors[1] = colortab;
 242    } else if (s->inverse) {
 243        colors[0] = colortab;
 244        colors[1] = colortab + dest_width;
 245    } else {
 246        colors[0] = colortab + dest_width;
 247        colors[1] = colortab;
 248    }
 249    dest = surface_data(surface);
 250    for (y = 0; y < 16; y++) {
 251        line = (y + s->start_line) & 63;
 252        src = s->framebuffer + 132 * (line >> 3) + 36;
 253        mask = 1 << (line & 7);
 254        for (x = 0; x < 96; x++) {
 255            memcpy(dest, colors[(*src & mask) != 0], dest_width);
 256            dest += dest_width;
 257            src++;
 258        }
 259        for (x = 1; x < MAGNIFY; x++) {
 260            memcpy(dest, dest - dest_width * 96, dest_width * 96);
 261            dest += dest_width * 96;
 262        }
 263    }
 264    s->redraw = 0;
 265    dpy_gfx_update(s->con, 0, 0, 96 * MAGNIFY, 16 * MAGNIFY);
 266}
 267
 268static void ssd0303_invalidate_display(void * opaque)
 269{
 270    ssd0303_state *s = (ssd0303_state *)opaque;
 271    s->redraw = 1;
 272}
 273
 274static const VMStateDescription vmstate_ssd0303 = {
 275    .name = "ssd0303_oled",
 276    .version_id = 1,
 277    .minimum_version_id = 1,
 278    .fields = (VMStateField[]) {
 279        VMSTATE_INT32(row, ssd0303_state),
 280        VMSTATE_INT32(col, ssd0303_state),
 281        VMSTATE_INT32(start_line, ssd0303_state),
 282        VMSTATE_INT32(mirror, ssd0303_state),
 283        VMSTATE_INT32(flash, ssd0303_state),
 284        VMSTATE_INT32(enabled, ssd0303_state),
 285        VMSTATE_INT32(inverse, ssd0303_state),
 286        VMSTATE_INT32(redraw, ssd0303_state),
 287        VMSTATE_UINT32(mode, ssd0303_state),
 288        VMSTATE_UINT32(cmd_state, ssd0303_state),
 289        VMSTATE_BUFFER(framebuffer, ssd0303_state),
 290        VMSTATE_I2C_SLAVE(parent_obj, ssd0303_state),
 291        VMSTATE_END_OF_LIST()
 292    }
 293};
 294
 295static const GraphicHwOps ssd0303_ops = {
 296    .invalidate  = ssd0303_invalidate_display,
 297    .gfx_update  = ssd0303_update_display,
 298};
 299
 300static int ssd0303_init(I2CSlave *i2c)
 301{
 302    ssd0303_state *s = SSD0303(i2c);
 303
 304    s->con = graphic_console_init(DEVICE(i2c), 0, &ssd0303_ops, s);
 305    qemu_console_resize(s->con, 96 * MAGNIFY, 16 * MAGNIFY);
 306    return 0;
 307}
 308
 309static void ssd0303_class_init(ObjectClass *klass, void *data)
 310{
 311    DeviceClass *dc = DEVICE_CLASS(klass);
 312    I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
 313
 314    k->init = ssd0303_init;
 315    k->event = ssd0303_event;
 316    k->recv = ssd0303_recv;
 317    k->send = ssd0303_send;
 318    dc->vmsd = &vmstate_ssd0303;
 319}
 320
 321static const TypeInfo ssd0303_info = {
 322    .name          = TYPE_SSD0303,
 323    .parent        = TYPE_I2C_SLAVE,
 324    .instance_size = sizeof(ssd0303_state),
 325    .class_init    = ssd0303_class_init,
 326};
 327
 328static void ssd0303_register_types(void)
 329{
 330    type_register_static(&ssd0303_info);
 331}
 332
 333type_init(ssd0303_register_types)
 334