hw/display/ssd0303.c

   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 commands relating to brightness and geometry
  12    setup are ignored. */
  13
  14 #include "qemu/osdep.h"
  15 #include "hw/i2c/i2c.h"
  16 #include "migration/vmstate.h"
  17 #include "qemu/module.h"
  18 #include "ui/console.h"
  19 #include "qom/object.h"
  20
  21 //#define DEBUG_SSD0303 1
  22
  23 #ifdef DEBUG_SSD0303
  24 #define DPRINTF(fmt, ...) \
  25 do { printf("ssd0303: " fmt , ## __VA_ARGS__); } while (0)
  26 #define BADF(fmt, ...) \
  27 do { fprintf(stderr, "ssd0303: error: " fmt , ## __VA_ARGS__); exit(1);} while (0)
  28 #else
  29 #define DPRINTF(fmt, ...) do {} while(0)
  30 #define BADF(fmt, ...) \
  31 do { fprintf(stderr, "ssd0303: error: " fmt , ## __VA_ARGS__);} while (0)
  32 #endif
  33
  34 /* Scaling factor for pixels.  */
  35 #define MAGNIFY 4
  36
  37 enum ssd0303_mode
  38 {
  39     SSD0303_IDLE,
  40     SSD0303_DATA,
  41     SSD0303_CMD
  42 };
  43
  44 enum ssd0303_cmd {
  45     SSD0303_CMD_NONE,
  46     SSD0303_CMD_SKIP1
  47 };
  48
  49 #define TYPE_SSD0303 "ssd0303"
  50 OBJECT_DECLARE_SIMPLE_TYPE(ssd0303_state, SSD0303)
  51
  52 struct ssd0303_state {
  53     I2CSlave parent_obj;
  54
  55     QemuConsole *con;
  56     int row;
  57     int col;
  58     int start_line;
  59     int mirror;
  60     int flash;
  61     int enabled;
  62     int inverse;
  63     int redraw;
  64     enum ssd0303_mode mode;
  65     enum ssd0303_cmd cmd_state;
  66     uint8_t framebuffer[132*8];
  67 };
  68
  69 static uint8_t ssd0303_recv(I2CSlave *i2c)
  70 {
  71     BADF("Reads not implemented\n");
  72     return 0xff;
  73 }
  74
  75 static int ssd0303_send(I2CSlave *i2c, uint8_t data)
  76 {
  77     ssd0303_state *s = SSD0303(i2c);
  78     enum ssd0303_cmd old_cmd_state;
  79
  80     switch (s->mode) {
  81     case SSD0303_IDLE:
  82         DPRINTF("byte 0x%02x\n", data);
  83         if (data == 0x80)
  84             s->mode = SSD0303_CMD;
  85         else if (data == 0x40)
  86             s->mode = SSD0303_DATA;
  87         else
  88             BADF("Unexpected byte 0x%x\n", data);
  89         break;
  90     case SSD0303_DATA:
  91         DPRINTF("data 0x%02x\n", data);
  92         if (s->col < 132) {
  93             s->framebuffer[s->col + s->row * 132] = data;
  94             s->col++;
  95             s->redraw = 1;
  96         }
  97         break;
  98     case SSD0303_CMD:
  99         old_cmd_state = s->cmd_state;
 100         s->cmd_state = SSD0303_CMD_NONE;
 101         switch (old_cmd_state) {
 102         case SSD0303_CMD_NONE:
 103             DPRINTF("cmd 0x%02x\n", data);
 104             s->mode = SSD0303_IDLE;
 105             switch (data) {
 106             case 0x00 ... 0x0f: /* Set lower column address.  */
 107                 s->col = (s->col & 0xf0) | (data & 0xf);
 108                 break;
 109             case 0x10 ... 0x20: /* Set higher column address.  */
 110                 s->col = (s->col & 0x0f) | ((data & 0xf) << 4);
 111                 break;
 112             case 0x40 ... 0x7f: /* Set start line.  */
 113                 s->start_line = 0;
 114                 break;
 115             case 0x81: /* Set contrast (Ignored).  */
 116                 s->cmd_state = SSD0303_CMD_SKIP1;
 117                 break;
 118             case 0xa0: /* Mirror off.  */
 119                 s->mirror = 0;
 120                 break;
 121             case 0xa1: /* Mirror off.  */
 122                 s->mirror = 1;
 123                 break;
 124             case 0xa4: /* Entire display off.  */
 125                 s->flash = 0;
 126                 break;
 127             case 0xa5: /* Entire display on.  */
 128                 s->flash = 1;
 129                 break;
 130             case 0xa6: /* Inverse off.  */
 131                 s->inverse = 0;
 132                 break;
 133             case 0xa7: /* Inverse on.  */
 134                 s->inverse = 1;
 135                 break;
 136             case 0xa8: /* Set multiplied ratio (Ignored).  */
 137                 s->cmd_state = SSD0303_CMD_SKIP1;
 138                 break;
 139             case 0xad: /* DC-DC power control.  */
 140                 s->cmd_state = SSD0303_CMD_SKIP1;
 141                 break;
 142             case 0xae: /* Display off.  */
 143                 s->enabled = 0;
 144                 break;
 145             case 0xaf: /* Display on.  */
 146                 s->enabled = 1;
 147                 break;
 148             case 0xb0 ... 0xbf: /* Set Page address.  */
 149                 s->row = data & 7;
 150                 break;
 151             case 0xc0 ... 0xc8: /* Set COM output direction (Ignored).  */
 152                 break;
 153             case 0xd3: /* Set display offset (Ignored).  */
 154                 s->cmd_state = SSD0303_CMD_SKIP1;
 155                 break;
 156             case 0xd5: /* Set display clock (Ignored).  */
 157                 s->cmd_state = SSD0303_CMD_SKIP1;
 158                 break;
 159             case 0xd8: /* Set color and power mode (Ignored).  */
 160                 s->cmd_state = SSD0303_CMD_SKIP1;
 161                 break;
 162             case 0xd9: /* Set pre-charge period (Ignored).  */
 163                 s->cmd_state = SSD0303_CMD_SKIP1;
 164                 break;
 165             case 0xda: /* Set COM pin configuration (Ignored).  */
 166                 s->cmd_state = SSD0303_CMD_SKIP1;
 167                 break;
 168             case 0xdb: /* Set VCOM dselect level (Ignored).  */
 169                 s->cmd_state = SSD0303_CMD_SKIP1;
 170                 break;
 171             case 0xe3: /* no-op.  */
 172                 break;
 173             default:
 174                 BADF("Unknown command: 0x%x\n", data);
 175             }
 176             break;
 177         case SSD0303_CMD_SKIP1:
 178             DPRINTF("skip 0x%02x\n", data);
 179             break;
 180         }
 181         break;
 182     }
 183     return 0;
 184 }
 185
 186 static int ssd0303_event(I2CSlave *i2c, enum i2c_event event)
 187 {
 188     ssd0303_state *s = SSD0303(i2c);
 189
 190     switch (event) {
 191     case I2C_FINISH:
 192         s->mode = SSD0303_IDLE;
 193         break;
 194     case I2C_START_RECV:
 195     case I2C_START_SEND:
 196     case I2C_NACK:
 197         /* Nothing to do.  */
 198         break;
 199     default:
 200         return -1;
 201     }
 202
 203     return 0;
 204 }
 205
 206 static void ssd0303_update_display(void *opaque)
 207 {
 208     ssd0303_state *s = (ssd0303_state *)opaque;
 209     DisplaySurface *surface = qemu_console_surface(s->con);
 210     uint8_t *dest;
 211     uint8_t *src;
 212     int x;
 213     int y;
 214     int line;
 215     char *colors[2];
 216     char colortab[MAGNIFY * 8];
 217     int dest_width;
 218     uint8_t mask;
 219
 220     if (!s->redraw)
 221         return;
 222
 223     switch (surface_bits_per_pixel(surface)) {
 224     case 0:
 225         return;
 226     case 15:
 227         dest_width = 2;
 228         break;
 229     case 16:
 230         dest_width = 2;
 231         break;
 232     case 24:
 233         dest_width = 3;
 234         break;
 235     case 32:
 236         dest_width = 4;
 237         break;
 238     default:
 239         BADF("Bad color depth\n");
 240         return;
 241     }
 242     dest_width *= MAGNIFY;
 243     memset(colortab, 0xff, dest_width);
 244     memset(colortab + dest_width, 0, dest_width);
 245     if (s->flash) {
 246         colors[0] = colortab;
 247         colors[1] = colortab;
 248     } else if (s->inverse) {
 249         colors[0] = colortab;
 250         colors[1] = colortab + dest_width;
 251     } else {
 252         colors[0] = colortab + dest_width;
 253         colors[1] = colortab;
 254     }
 255     dest = surface_data(surface);
 256     for (y = 0; y < 16; y++) {
 257         line = (y + s->start_line) & 63;
 258         src = s->framebuffer + 132 * (line >> 3) + 36;
 259         mask = 1 << (line & 7);
 260         for (x = 0; x < 96; x++) {
 261             memcpy(dest, colors[(*src & mask) != 0], dest_width);
 262             dest += dest_width;
 263             src++;
 264         }
 265         for (x = 1; x < MAGNIFY; x++) {
 266             memcpy(dest, dest - dest_width * 96, dest_width * 96);
 267             dest += dest_width * 96;
 268         }
 269     }
 270     s->redraw = 0;
 271     dpy_gfx_update(s->con, 0, 0, 96 * MAGNIFY, 16 * MAGNIFY);
 272 }
 273
 274 static void ssd0303_invalidate_display(void * opaque)
 275 {
 276     ssd0303_state *s = (ssd0303_state *)opaque;
 277     s->redraw = 1;
 278 }
 279
 280 static const VMStateDescription vmstate_ssd0303 = {
 281     .name = "ssd0303_oled",
 282     .version_id = 1,
 283     .minimum_version_id = 1,
 284     .fields = (const VMStateField[]) {
 285         VMSTATE_INT32(row, ssd0303_state),
 286         VMSTATE_INT32(col, ssd0303_state),
 287         VMSTATE_INT32(start_line, ssd0303_state),
 288         VMSTATE_INT32(mirror, ssd0303_state),
 289         VMSTATE_INT32(flash, ssd0303_state),
 290         VMSTATE_INT32(enabled, ssd0303_state),
 291         VMSTATE_INT32(inverse, ssd0303_state),
 292         VMSTATE_INT32(redraw, ssd0303_state),
 293         VMSTATE_UINT32(mode, ssd0303_state),
 294         VMSTATE_UINT32(cmd_state, ssd0303_state),
 295         VMSTATE_BUFFER(framebuffer, ssd0303_state),
 296         VMSTATE_I2C_SLAVE(parent_obj, ssd0303_state),
 297         VMSTATE_END_OF_LIST()
 298     }
 299 };
 300
 301 static const GraphicHwOps ssd0303_ops = {
 302     .invalidate  = ssd0303_invalidate_display,
 303     .gfx_update  = ssd0303_update_display,
 304 };
 305
 306 static void ssd0303_realize(DeviceState *dev, Error **errp)
 307 {
 308     ssd0303_state *s = SSD0303(dev);
 309
 310     s->con = graphic_console_init(dev, 0, &ssd0303_ops, s);
 311     qemu_console_resize(s->con, 96 * MAGNIFY, 16 * MAGNIFY);
 312 }
 313
 314 static void ssd0303_class_init(ObjectClass *klass, void *data)
 315 {
 316     DeviceClass *dc = DEVICE_CLASS(klass);
 317     I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
 318
 319     dc->realize = ssd0303_realize;
 320     k->event = ssd0303_event;
 321     k->recv = ssd0303_recv;
 322     k->send = ssd0303_send;
 323     dc->vmsd = &vmstate_ssd0303;
 324 }
 325
 326 static const TypeInfo ssd0303_info = {
 327     .name          = TYPE_SSD0303,
 328     .parent        = TYPE_I2C_SLAVE,
 329     .instance_size = sizeof(ssd0303_state),
 330     .class_init    = ssd0303_class_init,
 331 };
 332
 333 static void ssd0303_register_types(void)
 334 {
 335     type_register_static(&ssd0303_info);
 336 }
 337
 338 type_init(ssd0303_register_types)